/[gxemul]/trunk/src/debugger.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Revision 2 - (hide annotations)
Mon Oct 8 16:17:48 2007 UTC (16 years, 5 months ago) by dpavlin
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File size: 47145 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.676 2005/04/07 15:14:55 debug Exp $

Changelog for GXemul:
---------------------

20030829	Skeleton. ELF stuff. Some instructions.
20030830	Simple test programs using +-*/^|&%, function calls,
		loops, and stuff like that work.
20030903	Adding more instructions, fixing some bugs.
20030907	Making adding of memory mapped devices easier, although
		the framework isn't built for speed.
		Adding a -q switch to turn of debug output.
20030911	Trying to fix some bugs. Minor changes. Some COP0
		registers are now meaningful.
20030919	Making APs (non-bootstrap cpus) available via a simple
		'mp' device. Implementing ll/lld and sc/scd (for atomic
		memory updates, needed by MP operating systems).
20030923	Minor updates: more instructions (divu, mulu, lwu,
		perhaps some more), and opcode usage statistics.
20030924	If the next instruction is nullified (for 'branch
		likely' type of instructions), counters for delays etc
		are now decreased as they should.
		Adding some comments.
		Adding instructions: movz, movn.
		Adding a simple mandelbrot test to mipstest.c.
20030925	Adding instructions: bltzl, bgezl, lh, lhu, sh, mfc*,
		mtc*.
		Adding a dummy instructions: sync, cache.
		Adding minimal DECstation PROM functionality: printf()
		and getsysid() callback functions.
		Beginning work on address translation.
20030927	Adding some more cop0 functionality (tlb stuff).
		Adding mc146818 real-time clock. (Skeleton stuff.)
20030928	Adding a dc7085 serial console device (dummy, but enough
		to output chars to the screen). NetBSD uses this for
		the MIPSMATE 5100.
20030929	Working on the TLB stuff.
		Adding instructions: srlv, tlbwr, tlbr, tlbp, eret.
20030930	Trying to find a bug which causes NetBSD to bug out, but
		it is really hard.
		Adding some a.out support (for loading an old
		OpenBSD 2.8/pmax kernel image).
		Adding instructions: lwc*, ldc*, swc1 and swc3.
		Beginning to add special code to handle the differences
		between R4000 (the default emulation) and R2000/R3000.
20031001	Symbol listings produced by 'nm -S' can be used to
		show symbolic names for addresses. (-S)
20031002	Fixing the i/d fake cache for R2000/R3000. It's still
		just an ugly hack, though.
		Fixing minor bugs to make the 3100 emulation use the
		dc device (serial console) correctly. So far, 5100 and
		3100 are the only ones that get far enough to print
		stuff, when booting NetBSD.
20031004	Adding skeleton Cobalt machine emulation (-E).
		Adding a dummy ns16550 serial controller, used by the
		Cobalt machine emulation.
20031006	Adding unaligned load/store instructions (lwl, lwr,
		ldl, ldr, swl, swr, sdl, sdr), although they are not
		tested yet.
		Fixed a "data modified on freelist" bug when running
		NetBSD/cobalt: setting the top bit of the index register
		when a tlbp fails (as the R4000 manual says) isn't
		sufficient, I had to clear the low bits as well.
		Adding break and syscall instructions, but they are not
		tested yet.
		Adding a 'gt' device, faking a PCI bus, for the Cobalt
		emulation.
20031008	Adding initial support for HPCmips (-F), a framebuffer
		device using X11. NetBSD/hpcmips can output pixels to
		the framebuffer, but that's about it.
20031009	Fixing the NetBSD/pmax bug: the "0/tftp/netbsd" style
		bootstring was only passed correctly in the bootinfo
		block, it needs to be passed as argv[0] as well.
		Adding instructions: mtlo, mthi.
		Rearrangning the source tree layout.
		Adding console input functionality. The NetBSD/cobalt
		kernel's ddb can now be interacted with.
20031010	Adding experimental (semi-useless) -t option, to show
		a function call tree while a program runs.
		Linux/cobalt now prints a few messages, but then hangs
		at "Calibrating delay loop..." unless an ugly hack is
		used (setting a word of memory at 0x801e472c to non-zero).
20031013	Adding a framebuffer device used in DECstation 3100;
		VFB01 for mono is implemented so far, not yet the
		VFB02 (color) variant.  Rewriting the framebuffer
		device so that it is usable by both HPCmips and DECstation
		emulation.
20031014	Minor fixes. Everything should compile and run ok
		both with and without X11.
20031015	Adding support for ECOFF binary images; text, data,
		and symbols are loaded. (Playing around with ultrixboot
		and ultrix kernels.)
20031016	The DECstation argv,argc stuff must be at 0xa0000000,
		not 0x80000000, or Ultrix kernels complain.
		Adding R2000/R3000 'rfe' instruction.
		Implementing more R2K/R3K tlb specific stuff, so that
		NetBSD boots and uses the tlb correctly, but much of
		it is ugly. (Needs to be separated in a cleaner way.)
		ECOFF symbols sizes are now calculated, so that offsets
		within symbols are usable.
20031017	DECstation bootstrings now automatically include the
		correct name of the kernel that is booting.
		Ultrix boots a bit.
20031018	ELF symbols are now read automatically from the binary.
		-t trace looks a bit better (string arguments are shown).
		Trying to get initial R5900 stuff working (the 128-bit
		CPU used in Playstation 2).
		Fixing a minor bug to make the VFB02 (color framebuffer)
		device work better, but it is still just 256 grayscales,
		not real color. Ultrix can now use the framebuffer (it
		calls it PMAX-CFB).
		A machine can now consist of CPUs of different types.
		Adding instructions: daddi, mov_xxx, mult_xx. The xxx
		instructions are not documented MIPS64 instructions,
		but NetBSD/playstation2 uses them. Perhaps VR5432
		instructions?
		Adding sign-extension to 32-bit mult.
		Adding Playstation 2 devices: dmac (DMA controller),
		gs (Graphic something?), and gif (graphics something
		else, which has access to the PS2's framebuffer).
		NetBSD/playstation2 works a bit, and prints a few
		bootup messages.
20031020	The cpu_type field of the cpu struct now contains
		usable values in a much better form than before. This
		simplifies adding of new CPU types.
20031021	Fixing an interrupt related bug: pc_last was used, but
		for interrupts this was incorrect. Fixed now.
		Fixing a load/store related bug: if a load into a
		register was aborted due to an exception, the register
		was still modified.
		The mc146818 rtc now reads its time from the system's
		time() function.
		Fixing another exception bug: if loading an instruction
		caused an exception, something bogus happened as the
		emulator tried to execute the instruction anyway. This
		has been fixed now.
20031023	Adding a quick hack which skips "while (reg --) ;"
		kind of loops.
		NetBSD/pmax suddenly reached userland (!), but only
		once and attempts to repeat it have failed. I believe
		it is problems with my interrupt handling system.
20031024	Adding 8-bit color palette support to the framebuffer.
		Connecting the pmax vdac device to the framebuffer's
		rgb palette.
		Fixing a bug in the dc device, so that console input
		is possible; interaction with NetBSD/pmax's built-in
		kernel debugger works now.
		Symbol sizes for file formats where symbol size isn't
		included are now calculated regardless of file format.
		Physical memory space can now be smaller than 64 bits,
		improving emulation speed a bit.
		Doing other minor performance enhancements by moving
		around some statements in critical parts of the code.
20031025	Minor changes to the dc device.
20031026	Adding support for reading symbols directly from
		a.out files. (Works with OpenBSD/pmax binaries.)
		Hardware devices may now register "tick functions" at
		specific cycle intervals in a generic fashion.
		All four channels of the dc serial controller device
		should now work; playing around with keyboard scan
		code generation when using the DECstation framebuffer.
		Making various (speed) improvements to the framebuffer
		device.
20031027	Playing around with the sii SCSI controller.
20031028	Minor fixes.
		Adding an SGI emulation mode (-G), and some ARCBIOS
		stuff, which SGIs seem to use.
		Adding getbitmap() to the DEC prom emulation layer,
		so some more -D x models become more usable.
		Adding a dummy 'ssc' serial console device for
		DECsystem 5400 emulation.
		Playing around with TURBOchannel stuff.
20031030	Minor fixes.
		Adding the sub instruction. (Not tested yet?)
		Sign-extending the results of multu, addi,addiu,
		add,addu,sub,subu,mfcZ.
		Adding a colorplanemask device for DECstation 3100.
		Fixed the NetBSD/pmax bug: I had forgotten to reset
		asid_match to 0 between tlb entry checks. :-)  Now
		userland runs nicely...
20031031	Fixing more bugs:  unaligned load/store could fail
		because of an exception, but registers could be "half
		updated". This has been fixed now.  (As a result,
		NetBSD/pmax can now run with any of r2000,r3000,r4000,
		r4400, or r5000.)
		Adding some R5K and R10000 stuff.  (Note: R5K is NOT
		R5000. Weird.)
		Adding dummy serial console (scc) for MAXINE.
		MAXINE also works with framebuffer, but there is no
		color palette yet (only black and white output).
20031101	Moving code chunks around to increase performance by
		a few percent.
		The opcode statistics option (-s) now shows opcode
		names, and not just numbers. :-)
		Fixing the bug which caused NetBSD/pmax to refuse
		input in serial console mode, but not in keyboard/
		framebuffer mode: the osconsole environment variable
		wasn't set correctly.
		Adding DEC PROM getchar() call.
		The transmitter scanner of the dc device now scans
		all four channels at once, for each tick, so serial
		output is (approximately) 4 times faster.
20031103	Adding a dummy BT459 vdac device, which does nothing
		but allows a PMAG-BA turbochannel graphics card to be
		used as framebuffer.
		Several DECstation machines (-D 2, 3, and 4) can now
		use TURBOchannel option card framebuffers as console,
		for output. (Keyboard input is still not implemented
		for those models.)  Only PMAG-AA (1280x1024x8) and
		PMAG-BA (1024x864x8), both using BT459 vdac, have
		been tested so far.
		Modifying the X11 routines so that several framebuffer
		windows now can be used simultaneously (if several
		graphics option cards are to be emulated concurrently).
20031104	DEC MIPSMATE 5100 (KN230) interrupts are shared
		between devices. I've added an ugly hack to allow
		that to work, which makes it possible to boot NetBSD
		into userland with serial console.
20031106	Removing the -S (symbol) option, as symbol files can
		now be given in any order together with other file
		names to be loaded.
		cookin tipped me about using (int64_t) (int32_t)
		casts instead of manually sign-extending values.
		Casting sometimes increases performance, sometimes
		decreases. It's tricky.
		Importing mips64emul into CVS.
20031107	Adding a generic ARC emulation mode.
		Increasing performance of the framebuffer by not
		updating it (or the XImage) if a write to the
		framebuffer contains exactly what is already in it.
		(This improves scrolling speed and initialization.)
		Adding initial MIPS16 support.
		Adding initial disk image support (-d command line
		option), but this will not be used until I get some
		kind of SCSI-controller emulation working.
20031108	Adding the first MIPS16 instructions: "move y,X",
		"ld y,D(x)", and "daddiu S,K" (but the last one
		doesn't work yet).
		Fixing the console environment variable for
		Enough of the 'asc' controller is now implemented
		to let NetBSD get past scsi disk detection when
		no disk images are used.
		DECstation machine type 2; both serial console and
		graphical console work now.
		Other X-windows bit-depths than 24 bits work now,
		but colors are still not correct in non-24 bit modes.
		Keypresses in X framebuffer windows are now
		translated into console keypresses. (Normal keys, but
		not cursor keys or other special keys.)
20031111	Adding support for X11 using non-24-bit output.
20031120	Adding X11 mouse event to emulated mouse event
		translation, but it's not tested yet.
		Trying to get more of the SCSI controller emulation
		to work.
20031124	Raw binaries can now be loaded into memory.
20031204	Adding srec binary support.
20031220	Adding some super-ugly arcbios emulation code.
		Making some progress on the SGI and ARC machine
		emulations.
20031222	SGI and ARC progress. Multiple CPUs are now added to
		the arcbios component tree (although NetBSD cannot
		actually use more than one).
20031228	Adding 'crime' and 'macepci' fake devices for SGI
		emulation.
		Finally implementing the cop0 'compare' register.
		Improvements to the ns16550 device, but it is still
		incomplete.
		SGI userland is now reached, but interaction is broken
		(due to the buggy ns16550).
20031229	Adding some more instructions: teq, dsllv
		Adding a Nintendo 64 emulation mode (skeleton).
		Adding R4300 and R12000 to the cpu list.
20031230	Adding bltzal, bltzall, bgezal, bgezall (not really
		tested yet).
		Fixing the 16550 serial controller device (by not
		supporting fifo, so in fact it emulates a 16450
		instead).  This causes NetBSD/sgimips to run nicely
		into userland, sysinst, and so on.
		Some ARC/RD94 interrupts seem to work ok now, but
		i/o interrupts are still not correctly implemented.
		NetBSD/arc userland is reached and can be interacted
		with, but there's no sysinst (?).
20040103	Trying to get some Irix stuff to work, but it's hard.
		Fixing some Cobalt/linux problems.
20040104	Adding a dummy 8250 device, so that Linux/sgimips can output
		console messages.
		Adding dmultu. (The same as dmult, so I'm not sure it's correct.
		Perhaps dmultu is correct and dmult is wrong...)
		Fixing a bug in unaligned load/stores of 64-bit values (a cast
		was needed).
		Linux/sgimips in 64-bit works a bit more than before.
		Adding simple (polled) input functionality to dev_zs.
		Making some progress on SGI-IP22 (IP32 still works best,
		though).
		Fixing the mc146818 clock device in ARC/NEC and SGI emulation
		modes, the year field was not correct.
		Adding a fake 'pref' instruction (lwc3).
20040106	Separating out memory.h from misc.h.
		Refactoring of a lot of small code fragments.
		The PCI bus device is now shared between Cobalt, SGI, and ARC.
		Support for RAM mirroring (dev_ram.c, not really tested yet).
		Ugly hack to select the largest of ELF string symbol tables,
		if there are more than one.
		Memory hole fix for ARCBIOS, and a fix for very large (>= 4GB)
		amounts of emulated RAM.
		TGA (DEC 21030) PCI graphics device. NetBSD/arc can boot with
		this card and use it as a framebuffer console.
20040107	Adding a fix (partly incorrect) to daddi, to allow Linux/sgimips
		to boot in 64-bit mode.
20040108	Fixing a sll/nop bug (rd==0 for nop, not sa==0 as before).
20040109	Trying to get an SGI-IP32 PROM image to boot.
20040110	Faking R10000 cache things.
		The PROM image boots, although it takes almost forever for it
		to realize that there is no keyboard.
		The 'gbe' SGI-IP32 graphics device works enough to display the
		Linux framebuffer penguin in the upper left corner :-)
20040111	-p and -P addresses can now be given as symbol names, not just
		numeric values.
		Experimenting with adding a PCIIDE (dev_wdc) controller to the
		Cobalt emulation.
20040120	Adding src/bintrans.c. No code yet, but this is a place for
		ideas to be written down.
		Increasing performance a little bit by inlining the check for
		interrupts (which occurs for every instruction).
20040124	Experimenting with pure userland (syscall) emulation.
20040127	Fixes for compiling under Solaris.
20040206	Some bintrans experiments.
20040209	Adding some simple Ultrix userland emulation syscalls.
20040211	Adding decprom_dump_txt_to_bin.c to the experiments/ dir.
		Adding a section to doc/ on how to use DECstation PROM dumps.
		Adding a hello world example to doc/ as well.
20040218	TURBOchannel slots that are empty now return a DBE exception,
		so that Ultrix and DECstation PROMs don't complain about
		broken TURBOchannel ROMs.
		Working some more on the machine-dependant interrupt stuff.
20040219	Trying out some Linux/DECstation kernels (semi-successfully).
20040222	YES! I finally found the bug that caused Linux/SGI-IP32 to only
		work on Alpha, not on 32-bit machines.  It was a shift left,
		probably done using 6 bits on alpha, 5 bits on 32-bit machines.
20040223	Some minimal DEC KN5800 progress; Ultrix prints some boot
		messages, detects 16 XMI R3000 cpus, and get a NULL panic.
		It's all fake, though, the CPUs don't actually work.
		Still, better than nothing :-)
20040225	An Ultrix OSF1 kernel with a ramdisk now boots :-)  (It was
		a problem with ultrixboot not giving the same arguments as
		NetBSD's boot program.)
20040225(later)	Fixing a bug in the DECstation dc serial device; digits 0-9
		were translated to numeric keypad 0-9, not the normal 0-9.
		(This caused Ultrix to print escape sequences instead of
		digits.)
20040226	Some progress on machine-dependant interrupt delivery
		for -D7 (Maxine) and -D4, and some more 'scc' serial
		controller featuers are implemented (but no interrupts/
		dma/keyboard/mouse stuff yet).
20040228	Progress on the scc controller; -D4 works in both serial
		console mode and with keyboard (graphical console), but no
		mouse yet.
20040301	SGI mace interrupts are now done using the new machine-
		independant interrupt system.
20040303	Fixing an R5900 bug; the lowest 6 bits have special meaning
		for coprocessor functions, not just 5 bits as on non-R5900
		CPUs. (This fixes a bug which caused NetBSD to crash.)
20040304	Adding enough (fake) DMA capabilities to the ioasic device
		to allow Ultrix to print boot messages in the -D3, -D4,
		and -D7 modes, and also print graphical console messages
		in -D4 and -D7 modes.
		-D11 (DEC5500) polled getchar added (to the 'ssc' device).
		Adding the 'madd' instruction (including R5900 weird stuff).
20040304(later)	Playstation 2's GIF can now copy 640x16 pixel chunks, allowing
		NetBSD to scroll up the framebuffer.  The cursor also works
		better now.
		Playstation 2 bootinfo RTC data should now be passed correctly
		to the running kernel.
		DECstation rtc year should be either 72 or 73, anything else
		will cause Ultrix to give a warning about invalid year.
20040306	Combining playstation2's dmac, interrupt, and timer devices
		into one (ps2_stuff).
		Adding some R5900 instructions: mfsa, mtsa, pmfhi, pmflo, por,
		lq, and sq.  (Most of them are just guesses, though.)
		Implementing my own XImage putpixel routine, which can be
		inlined... significantly faster than normal XPutPixel. :-)
20040307	Implementing the basic functionality of a "PMAG-CA" pixelstamp
		accellerated framebuffer device. Works with NetBSD and
		Ultrix, but no cursor or color support.
20040308	PMAG-CA, -DA, and -FA pixelstamps seem to work now.
		Adding a hack to allow a pmax/mach kernel to be loaded (it's
		a COFF file with 0 (!) sections).
		Initial test of bt459 + framebuffer cursor support.
20040309	Fixes/updates of dev_dec5800 and dev_ssc (and dev_decxmi) allow
		a KN5800 Ultrix-OSF1-ramdisk kernel to boot all the way into
		userland and be interacted with.
		The bt459 cursor should now look semi-nice, but it is still
		a bit fake.
20040310	Moving the DEC CCA stuff from src/machine.c into a separate
		device file (devices/dev_deccca.c).
		An ugly hack added to allow some more OSF/1 kernels (almost
		a.out, but without many of the header fields) to load.
20040314	Adding PMAG-JA and PMAG-RO (1280x1024 x 8-bit) TURBOchannel
		graphics devices. They work in Ultrix, but only monochrome
		and no cursor, because there are no ramdacs or such yet.
20040315	Pixelstamp solid fill now supports colors other than just
		zero-fill.
		Adding a (new) regression test skeleton.
20040321	Some really minor updates.
20040323	Fixes to allow SGI-IP20 and IP22 to work a bit better
		(aliased memory), and adding "private" firmware-like vectors
		to arcbios emul. An IP22 Irix kernel gets far enough to
		print an assertion warning (and then double panics). :-)
20040324	Adding a generalization hack to the SCC serial controller
		to work with SGI-IP19 (in addition to DECstations).
		Adding the 'sdc1' instruction.
		Some progress on various SGI emulation modes.
20040325	Minor updates.
20040326	Fixed a 'madd' bug (r5900). NetBSD/playstation2 now reaches
		userland correctly.  And a simple fix which allows NetBSD
		timer interrupts to be triggered; NetBSD uses T_MODE_CMPE
		(compare), while Linux uses _OVFE (overflow).
20040328	Linux on Playstation 2 boots a bit. The Playstation 2
		graphics controller has been extended to work better with
		NetBSD, and to include some Linux support as well.
		Some interrupt handling enhancements on Playstation 2,
		needed for Linux' dma.
		128-bit loads and stores (lq and sq) are allowed, although
		the top half of quadwords are not modified by other
		instructions. (Linux uses lq and sq.)
		Big-endian X Windows servers now display correct rgb color,
		not bgr as before.
20040330	Some minor updates to the documentation.
20040401	Adding a dummy ps2 OHCI device.
20040402	Progress on the asc SCSI controller.
20040406	Hack to allow ./configure, make to work on HP-UX B.11.00
		on HPPA-RISC, gcc 3.3.2. (Does not work with HP's cc.)
		More progress on the asc SCSI controller. Fixing INQUIRY,
		adding READ_CAPACITY, adding READ. Works a bit with NetBSD
		and some (but not all) Ultrix kernels, on DECstation type 2.
		Adding WRITE, SYNCRONIZE_CACHE.
		Mounting disks works in NetBSD :-)  It is a bit buggy,
		though. Or something else is buggy.
20040407	The bug is triggered by gunzip during NetBSD/pmax install.
20040408	Fixing a bug (non-nul-terminated string) which caused X11
		cursors to not display on Solaris.
		Unnecessary X11 redraws are skipped (removes some weird
		delays that existed before), and cursors are redrawn on
		window exposure. (The cursor functionality has been moved
		from dev_fb.c to x11.c.)
20040411	Fixing the DC7085 device so that Ultrix doesn't behave weird
		if both tx and rx interrupts occur at the same time.
		More advancements on the asc SCSI controller.
		More disk image filename prefixes are now recognized; c (for
		CD-ROM, as before), d for disk, b for boot device, r for
		read-only, and 0-7 for scsi id.
		Mounting disks works in Ultrix. Installing to disk usually
		crashes for various reasons, but an OSF/1 install gets
		relatively far (similar to the NetBSD/pmax install).
20040412	Trying to find the bug.
20040415	Finally found and fixed the bug; SCSI reads and writes
		(actually, any data in or data out) can be split up into
		multiple DMA transfers. That stuff was only partially
		implemented, and the part that was implemented was buggy.
		It works now. NetBSD/pmax and Ultrix 4.3 seems to like
		the SCSI stuff enough to install almost all the way.
20040415 (more)	Adding a hack which allows a host's cdrom device to be used as
		a cdrom device inside the emulator, eg /dev/cd0c.
		Making the cycle counter int64_t instead of long, as a 'long'
		overflows too easily on 32-bit machines. (The bug is still
		there, though.)
		I've now verified that a full NetBSD/pmax install can be done.
		If using a PMAG-AA graphics board, startx brings up X :-)
		mips64emul can be compiled inside NetBSD inside mips64emul,
		and it can run NetBSD in that environment. (I'm getting
		dizzy... :-)
20040417	Moving some coprocessor stuff from cpu.c to coproc.c.
20040424	Adding a BT455 vdac for PMAG-AA. Black and white are now
		rendered correctly in Xpmax.
		Adding colormap support to the BT459 device, for PMAG-BA.
20040425	Fixing a buffer length bug, which caused an Ultrix 4.5
		install to bug out on an i386 host.
20040429	FPU experiments.
20040502	More FPU experiments.
		Speedup for exception debug messages:  in quiet mode, debug
		messages were still evaluated, which took a relatively
		large amount of time.
20040503	Most FPU stuff fixed, but there is at least one known bug
		left; ps axu in NetBSD triggers it (ps loops forever).
20040504	A default install of Ultrix 4.5 succeeded! It boots up with
		a graphical login.
		Fixing the keyboard repetition bug (a lk201 "up" (release)
		scancode is now sent after every key).
20040505	Both CR and LF now produce the same lk201 scancode, so that
		pressing 'enter' works as expected in Ultrix.
20040506	Adding a vaddr to paddr translation cache, causing a speedup
		of perhaps 50% or more.
20040507	Fixing PMAG-BA color for Ultrix. (Ultrix relies on interrupts
		coming from the TURBOchannel slot to update the palette.)
20040508	Fixing cursor positioning for PMAG-BA.
20040511	Prints current nr of instructions per seconds, not only
		average, when using -N.
20040515	Some more bintrans experiments.
20040606	Adding ARCBIOS GetReadStatus() and Read().
		Adding some instructions: tlt, tltu, tge, tgeu, tne.
20040607	Adding the dsub instruction.
		Some minimal progress on SGI-IP30 emulation.
		Applying a patch from Juli Mallett to src/file.c (I'm not
		sure yet if it breaks or fixes anything).
		Some minor fixes for SGI-IP22 (such as faked board revision
		numbers).
20040608	ll/sc should now fail if any unrelated load/store occurs.
		Minor changes to the configure script.
		Adding some ifdefs around code which is not often used
		(the mfhi/mflo delay, and the last_used TLB experimental
		code); this might cause a tiny speedup.
20040609	Minor fixes.
20040610	Various minor SGI fixes (64-bit ARCS stuff, progress on the
		CRIME/MACE interrupt system, and some other random things).
20040611	More crime/mace progress, and some more work on pckbc.
		KN5800 progress: adding a XMI->BI adapter device; a disk
		controller is detected (but it is just a dummy so far).
20040612	Adding "dev_unreadable", which simplifies making memory
		areas unreadable. (NetBSD on SGI-IP22 no longer detects
		non-existant hpc1 and hpc2 busses.)
		Implementing rudimentary support for IP22 "local0" and
		"local1" interrupts, and "mappable" local interrupts.
		Some progress on the WDSC SCSI controller on IP22, enough
		to let NetBSD get past the disk detection and enter
		userland!  :-)
		The zs (zilog serial) device now works well enough to let
		NetBSD/sgimips be interacted with on IP22. :-)  (Though
		it is very ugly and hardcoded.)
20040613	IP32 didn't work last night, because there were too many
		tick functions registered. That has been increased now.
		Trying out NetBSD/sgimips 2.0 beta kernels. There are some
		differences compared to 1.6.2, which I'm trying to solve.
		Interrupt fixes for IP32: _serial and _misc are different.
		Separation of IP22 (Full-house) and IP24 (Guiness).
20040614	Modifying the memory layout for IP20,22,24,26 (RAM is now
		offset by 128MB, leaving room for EISA registers and such),
		and moving around some code chunks. This is not well
		tested yet, but seems to work.
		Moving parts of the tiny translation cache, as suggested
		by Juli Mallett.  It seems that the speedup isn't as
		apparent as it was a few weeks ago, though. :-(
		Speedups due to not translating addresses into symbol
		names unless the symbol name is actually printed.
		Added support for loading old big-endian (Irix) ECOFF
		kernels (0x60 0x01 as the first two bytes).
20040615 (late)	Adding enough SGI IP20 (Indigo) support to let NetBSD 2.0
		enter userland :-)  No interrupt specifics are implemented
		yet, so it hangs while doing terminal output.
20040618	Experimenting with the WDSC SCSI controller for IP20,22,24.
20040620	Adding a program which converts SGI prom dumps from text
		capture to binary, and some hacks to try to make such an
		IP22 PROM to work better in the emulator.
20040621	Removing the Nintendo 64 emulation mode, as it is too
		uninteresting to support.
		Adding SCSI tape device support (read-only, so far).
		Fixing a bug which caused the cursor to be corrupted if new
		data was written to the framebuffer, but the cursor wasn't
		moved.
20040622(early)	Finally! Making progress on the SCSI tape stuff; when going
		past the end of a file, automagically switch to the beginning
		of the next.
20040622(late)	Trying to track down the last SCSI tape bugs.
		Removing _all_ dynamic binary translation code (bintrans),
		starting from scratch again.
20040623(early)	Performing a general code cleanup (comments, fixing stuff
		that led to compiler warnings, ...).
		Disabling MIPS16 support by default, and making it a
		configure time option to enable it (--mips16). This gives
		a few percent speed increase overall.
		Increasing performance by assuming that instruction loads
		(reading from memory) will be at the same page as the last
		load.  (Several percent speedup.)
		Moving the list of kernels that can be found on the net from
		README to doc/.
20040624	Finally! I found and fixed the bug which caused 'ps', 'top',
		'xclock', and other programs in NetBSD/pmax to behave weird.
		Increasing performance by a few percent by running as many
		instructions in a row as possible, before checking for
		hardware ticks.
		When booting from SCSI tapes on DECstation, the bootstring
		now contains 'tz' instead of 'rz'.
		Adding a second ARC machine mode, "Acer PICA-61", -A2.
		Disabling the support for "instruction delays" by default
		(it has to be enabled manually in misc.h now, but is never
		used anywhere anyway).
		Other minor optimizations (moving around stuff in the
		cpu struct in misc.h, and caching cpu->pc in cpu.c).
		Separating the tiny translation cache into two, one for
		code and one for data. This gives a few percent speed
		increase.
20040625(early)	I think now is a good time for a "feature freeze",
		to let the code stabilize and then make some kind of
		first release.
20040625(later)	Adding a -v (verbose) command line option. If -v is not
		specified, the emulator goes into -q (quiet) mode just before
		it starts to execute MIPS code.
20040627	The configure script now adds -fomit-frame-pointer to the
		compile flags if the $CC seems to be able to handle that.
		Found and fixed a serious interrupt bug in BT459 (Ultrix'
		behaviour required a hack, which was incorrect), so
		performance for machines using the PMAG-BA framebuffer is
		now improved.
		For X11 bitdepths other than 8 or 24, a warning message
		is printed at startup.
		A number of other minor fixes, optimizations, updated
		comments and so on.
		Adding a BUGS file, a list of known bugs.
		Adding a minimal man page, doc/mips64emul.1.
20040628	Hacks for faking the existance of a second level cache
		(ARCBIOS and other places).
		An important fix for dc7085: tx interrupts should happen
		before rx interrupts, not the other way around as it was
		before. (This speeds up NetBSD boot on DECstation, and
		fixes a bug which Ultrix triggered on heavy keyboard input.)
		A couple of other minor fixes.
		Framebuffer fix: there was a bug which caused the rightmost/
		bottom pixel to sometimes not be updated, when running in
		scaledown mode. This is now fixed.
		Adding a small program which removes "zero holes" from
		harddisk image files.
20040629	More minor fixes.
20040629(later)	Adding -A3 (NEC RISCstation 2200) (this is similar to
		the 2250 model that NetBSD/arc can already boot all the
		way into userland and be interacted with), and -A4
		(Deskstation Tyne).
		Some more minor fixes.
20040630	Adding support for 15 and 16 bits X11 framebuffers,
		and converting from XYPixmap to ZPixmap (this fixes the
		problem of updates appearing in "layers" on some X
		servers).
		The pixels in the mouse cursor (for BT459) are now colored
		as the emulated OS sets them, although no transparency
		masking is done on the edges of the cursor yet. (In plain
		English:  the mouse cursor is no longer just a white solid
		square, you can actually see the mouse cursor image
		on the white square.)

==============  RELEASE 0.1  ==============

20040701	The -j option now takes a name, the of the kernel as passed
		on to the bootloader.  ("netbsd" is the default name.)
		Adding support to load bootstrap code directly from a disk
		image, for DECstation.  Both NetBSD/pmax and Ultrix boot
		straight of a disk image now, with no need to supply a
		kernel filename on the command line.  (Ultrix still needs
		-j vmunix, though, to boot from /vmunix instead of /netbsd.)
20040702	Minor bugfix (some new untested code for X11 keypresses was
		incorrect).
20040702(later)	Adding an ugly hack for CDROMs in FreeBSD; if an fread() isn't
		done at a 2048-byte aligned offset, it will fail. The hack
		tries to read at 2048-byte aligned offsets and move around
		buffers to make it work.
		Adding video off (screen blanking) support to BT459.

==============  RELEASE 0.1.1  ==============

20040702(later)	Cleanup to remove compiler warnings (Compaq's cc, Solaris' cc,
		and gcc 3.3.3/3.3.4 in Linux), mostly by putting ULL on large
		numeric constants.
		Better support for scaledown of BT459 cursors, but still not
		color-averaging.
		Beginning the work on adding better memory latency support
		(instruction delays), enabled by the --delays configure option.
20040703	Modifications to the configure script so that a config.h file
		is created, containing things that were passed along as
		-Dxxx on each cc command line before.
		More work on instruction latency support; trying to separate
		the concepts of nr of cycles and nr of instructions.
20040704	Working on R2000/R3000 caches.
		Adding a '--caches' option to the configure script.
		Various small optimizations.
		R3000 caches finally work. (I know that there is at least one
		bug, regarding interrupt response.)
20040705	Working on the 'le' device, and on a generic (device
		independant) networking framework. le can transmit and receive
		packets, and the network framework fakes ARP responses from a
		fake gateway machine (at a fixed ip address, 10.0.0.254).
		Adding a '-c' command line option, which makes emulated_hz
		automatically adjust itself to the current number of emulated
		cycles per host CPU second (measured at regular intervals).
20040707	Removing the '-c' option again, and making it the default
		behaviour of the emulator to automatically adjust clock
		interrupts to runtime speed (as long as it is above 1 MHz).
		(This can be overridden by specifying a static clock rate with
		the -I option.)
		Updating the doc/ stuff a bit.
		Generalization of the DECstation bootblock loading, to work
		with Sprite/pmax. Lots of other minor modifications to make
		Sprite work, such as adding support for DECstation "jump table"
		PROM functions, in addition to the old callback functions.
		Sprite boots from a disk image, starting the kernel if the
		argument "-j vmsprite" is used, but it seems to not like the
		DBE exceptions caused by reading empty TURBOchannel slots. :-/
20040708	Minor changes and perhaps some tiny speed improvements.
		The Lance chip is (apparently) supposed to set the length of
		received packets to len+4. (I've not found this in any 
		documentation, but this is what NetBSD expects.) So now, ICMP
		echo replies work :-)  UDP works in the outgoing direction,
		in the incoming direction, tcpdump can see the packets but they
		seem to be ignored anyway. (Weird.)
		Adding a separate virtual-address-to-host-page translation
		cache, 1-entry for loads, 1-entry for stores. (For now, it
		only works on R4000 as there are conflicts with cache usage
		on R3000).
		Changing the lower clock speed bound from 1 MHz to 1.5 MHz.
20040709	Incoming UDP checksums were wrong, but are now set to zero
		and NetBSD inside the emulator now accepts the packets (eg.
		nameserver responses).  Host lookups and even tftp file
		transfers (using UDP) work now :-)
		Adding a section on Networking to the Technical documentation,
		and a preliminary NetBSD/pmax install instruction for network
		installs to the User documentation.
		Some updates to the man page.
20040709(later)	Fix to the TURBOchannel code to allow Sprite to get past the
		card detection. Seems to still work with Ultrix and NetBSD.
		This also makes Linux/DECstation properly recognize both the
		Lance controller and the SCSI controller. Linux 2.4.26 from
		Debian boots nicely in framebuffer mode :-)
20040710	Some bits in the KN02 CSR that were supposed to be readonly
		weren't. That has been fixed, and this allows Linux/DECstation
		to get past SCSI detection. :-)
		Minor updates to the ASC controller, which makes Linux and
		OpenBSD/pmax like the controller enough to be able to access
		SCSI devices. OpenBSD/pmax boots from a disk image for the
		first time. :-)  Linux detects SCSI disks, but I have no
		bootable Linux diskimage to test this with.
		Updating the doc/ to include instructions on how to install
		OpenBSD/pmax onto a disk image.
		Naively added a PMAGB-BA (1280x1024x8) in hopes that it would
		basically be a PMAG-BA (1024x864x8) in higher resolution,
		but it didn't work that way. I'll have to look into this later.
		Adding a -o option, useful for selecting '-s' (single user
		mode) during OpenBSD install and other things.
		After a lot of debugging, a serious bug related to the tiny
		cache was found; Linux just changes the ASID and returns when
		switching between processes in some occasions without actually
		_writing_ to the TLB, and I had forgotten to invalidate the
		tiny cache on such a change.
20040711(early)	I've been trying to repeat the OpenBSD install from yesterday,
		but appart from the first initial install (which was
		successful), I've only been able to do one more. Several
		attempts have failed with a filesystem panic in the middle
		of install. I'm not sure why.
20040711	I found the "bug": wget downloaded the simpleroot28.fs.gz file
		as read-only, and gunzip preserved those flags. Thus, OpenBSD's
		installer crashed as it didn't get its writes through to the
		disk.
		Parts of the 1280x1024x8 PMAGB-BA graphics card has been
		implemented, it works (unaccelerated) in NetBSD and OpenBSD,
		but Ultrix does not seem to like it.
		Cleaned up the BT459 cursor offset stuff a bit.
		Trying to make the emulated mouse coordinates follow the host's
		mouse' coordinates (for lk201, DECstation), by
		"de-accelerating" the data sent to the emulated OS.
20040711(later)	Fix so that Sprite detects the PMAG-BA correctly.
		Adding some stuff about NFS via UDP to the documentation.
		Fixed the 'update flag' for seconds, so now Sprite doesn't
		crash because of timer-related issues anymore.
		Fixing KN02 interrupt masks a bit more, to make Sprite not
		crash. Sprite now runs quite well.
20040712	Working on IP/UDP fragementation issues. Incoming UDP packets
		from the outside world can now be broken up into fragments
		for the guest OS. (This allows, for example, OpenBSD/pmax to
		be installed via nfs.)  Outgoing fragmented packets are NOT
		yet handled.
		Linux doesn't use 64-bit file offsets by default, which is
		needed when using large disk images (more than 2GB), so the
		configure script has now been modified to add necessary
		compiler flags for Linux.
20040713	Trying out some minor optimizations.
		Refreshing the UDP implementation in src/net.c a little.
20040714	Updating the documentation a little on how to experiment
		with a Debian Linux install kernel for DECstations.
		A 'mini.iso' Linux image for DECstation has different fields
		at offsets 0x10 and 0x14, so I'm guessing that the first is
		the load address and the second is the initial PC value.
		Hopefully this doesn't break anything.
		Some initial TCP hacks, but not much is working yet.
		Some updates for IP30:  The load/store 1-entry cache didn't
		work too well with IP30 memory, so it's only turned on for
		"MMU4K" now. (This needs to be fixed some better way.)
		Adding a hack which allows Linux/Octane to use ARC write()
		and getchild() on IP30. Linux uses ARCBIOS_SPB_SIGNATURE as a
		64-bit field, it was 32-bit before.
		Making ugly hacks to the arcbios emulation to semi-support
		64-bit equivalents of 32-bit structures.
20040716	Minor fixes to the configure script (and a few other places)
		to make the sources compile out-of-the-box on HP-UX (ia64
		and HPPA), old OpenBSD/pmax (inside the emulator itself), and
		Tru64 (OSF/1) on Alpha.
		A couple of other minor fixes.
20040717	A little TCP progress; OpenBSD/pmax likes my SYN+ACK replies,
		and tries to send out data, but NetBSD/pmax just drops the
		SYN+ACK packets.
		Trial-and-error led me to change the 64-bit ARCS component
		struct again (Linux/IP30 likes it now). I'm not sure about all 
		of the offsets yet, but some things seem to work.
		More 64-bit ARCS updates (memory descriptors etc).
		Better memory offset fix for IP30, similar to how I did it for
		IP22 etc. (Hopefully this doesn't break anything else.)
		Adding a MardiGras graphics controller skeleton for SGI-IP30
		(dev_sgi_mardigras.c).
		Thanks to Stanislaw Skowronek for dual-licensing mgras.h.
		Finally rewrote get_symbol_name() to O(log n) instead of O(n)
		(Stanislaw's Linux kernel had so many symbols that tracing
		with the old get_symbol_name() was unbareably slow).
		Removing all of the experimental tlbmod tag optimization code
		(the 1-entry load/store cache), as it causes more trouble than
		the performance gain was worth.
20040718	The MardiGras device works well enough to let Linux draw the
		SGI logo and output text.
		A bunch of other minor changes.
20040719	Trying to move out all of the instruction_trace stuff from the
		main cpu loop (for two reasons: a little performance gain,
		and to make it easier to add a GUI later on).
20040720	Finally found and fixed the ethernet/tcp bug. The hardware
		address is comprised of 6 bytes, where the _first_ byte should
		have a zero as the lowest bit, not the last byte. (This causes
		NetBSD and Linux running in the emulator to accept my SYN+ACK
		packets.)
		Getting the first nameserver address from /etc/resolv.conf.
		(This is not used yet, but could be useful if/when I add
		internal DHCP support.)
		Working more on the TCP stuff; TCP seems to be almost working,
		the only immediate problem left is that the guest OS gets
		stuck in the closing and last-ack states, when it shouldn't.
		It is now possible to install NetBSD and OpenBSD via ftp. :-)
20040721	Trying to fix the last-ack bug, by sending an RST after the
		end of a connection. (Probably not a correct fix, but seems
		to work?)
		Adding a my_fseek() function, which works like fseek() but
		with off_t instead of long, so that large disk images can
		be used on systems where long is 32 bits.
20040722	Trying to fix some more TCP related bugs.
20040725	Changing the inlined asm statement in bintrans_alpha.c into
		a call to a hardcoded array of bytes that do the same thing
		(an instruction cache invalidation). This allows the same
		invalidation code to be used regardless of compiler.
		Some other minor changes.
20040726	Minor updates. The configure script is now more verbose.
		A Debian/IP22 Linux tftp boot kernel requires ARCS memory to
		be FreeMemory, not FreeContiguous. (This should still work with
		other SGI and ARC OSes.)
		Fix for ARCS write(), so it returns good write count and
		success result (0).
		Some hacks to the IP22 memory controller, to fake 72MB RAM
		in bank 0.
		The IP22 Debian kernel reaches userland (ramdisk) when run
		with -G24 -M72 -CR4400, if a special hack is done to the
		zs device.
20040730	Removing mgras.h, as I'm not sure a file dual-licensed this way
		would work. (Dual-licensing as two separate files would work
		though.)
		Preparing for the upcoming release (0.2).
20040801	Fixing the 512 vs 2048 cdrom sector size bug; I hadn't 
		implemented the mode select SCSI command. (It still isn't
		really implemented.)
		A bug which crashes the emulator is triggered when run with
		new NetBSD 2.0_BETA snapshots on a Linux/i386 host. I'm not
		sure why.
		UDP packets sent to the gateway (at 10.0.0.254) are now
		forwarded to the machine that the host uses as its nameserver.
		Some other minor fixes.

==============  RELEASE 0.2  ==============

20040803	A post-3.5 OpenBSD/sgimips kernel snapshot with ramdisk seems
		to boot fine in the emulator, all the way to userland, and
		can be interacted with.
		Adding a -y option, used to set how many (random) instructions
		to run from each CPU at max (useful for SMP instruction
		interleave experiments).
		Importing a 8x16 console font from FreeBSD (vt220l.816).
		Adding a skeleton for a 80x25 text console device (dev_vga),
		useful for some ARC modes. (Character output is possible, but
		no cursor yet.)
		Adding a dev_zero device (returns zeroes on read).
		OpenBSD/arc 2.3 can get all the way to userland with -A4 (if
		the wdc devices are commented out) but bugs out there, probably
		because of interrupt issues.
		Adding a -A5 ARC emulation mode (Microsoft-Jazz, "MIPS Magnum")
		which NetBSD seems to like. No interrupt specifics yet, so
		it hangs while waiting for SCSI.
20040804	Some dev_mp updates.
		The -y switch has to do with number of cycles, not number
		of instructions; variable names have been changed to reflect
		this.
20040805	Minor updates. Adding some more CPU types/names, but they
		are probably bogus.
		Adding a MeshCube emulation mode. Just a skeleton so far, but
		enough to let a Linux kernel print some boot messages.
		Adding the 'deret' instruction.
20040806	Adding include/impactsr-bsd.h (a newer version of what was in
		mgras.h before, and this time with only a BSD-style license),
		but it is not used yet.
20040810	Some Au1500 updates.
20040811	Adding the 'clz', 'clo', 'dclz', and 'dclo' special2 (MIPS32
		and MIPS64) instructions.
		More Au1500 updates.
20040812	Using fseeko(), when it is available.
		Other minor updates.
		Adding a NetGear WG602 emulation mode skeleton (-g); after
		a lot of trial and error, a Linux kernel (WG602_V1715.img)
		gets all the way to userland, but hangs there.
20040818	Adding signal handlers to better cope with CTRL-Z and CTRL-C.
		Adding a simple interactive single-step debugger which is
		activated by CTRL-C. (Commands so far: continue, dump, help,
		itrace, quit, registers, step, trace, version)
20040818(later)	Adding a 'tlbdump' debugger command, and some other minor
		fixes.
20040819	Minor updates. Adding an 'unassemble' debugger command.
20040822	Minor updates to the regression testing framework.
20040824	Minor updates based on feedback from Alec Voropay
		(configure script updates for Cygwin and documentation).
20040826	Minor updates.
		Adding a cursor to the VGA text console device.
		Changing all old 11:22:..55:66 ethernet macs to 10:20..60,
		still hardcoded though.
20040828	Minor updates.
20040829	mips64emul is 1 year old today :-)
20040901	tests/README now lists "all" MIPS opcodes. This list should
		be updated whenever a new opcode is implemented, or when a
		regression test is added. (A combination of instructions from
		the TX79 manual, the GNU assembler, and the MIPS64 manual).
		Hopefully I haven't missed too many.
		Adding a section on regression testing to doc/technical.html.
20040902	Finally beginning the work on separating out the stuff from
		main.c into a "struct emul". Very time-consuming.
		Some minor fixes for LL/SC on R10000.
20040905	Moving more stuff from main.c into struct emul. Unfortunately,
		it seems that this causes a slowdown of the emulator.
		Userland emulation is now only used if --userland is used
		when running configure.
		Modifying src/symbol.c to not use global variables.
20040906	Minor update.
20040914	Using $COPTIM when detecting which compiler flags to use in
		the configure script. (This makes sure that combinations of
		flags should work.)
		There'll probably be a 0.2.1 release some time soon, but I'll
		do some more clean-up first.
		Minor update to the detection of ECOFF files, but I don't like
		it; sometimes the endianness of the magic value seems to be
		swapped, but it doesn't have to do with endianness of the
		actual data?
20040916	Minor updates. Adding an Example section to the manpage, but
		as I'm not really familiar with manpage formatting, it will
		need to be rewritten later.
20040917	Finally making the coprocessor instructions disassemblable
		even when not running.
		Doing some testing for the 0.2.1 release.

==============  RELEASE 0.2.1  ==============

20040923	Updating the documentation about how to (try to) install
		Debian GNU/Linux.
20040924	Some more updates to the documentation.
20040925	Adding overflow stuff to 'add' and 'sub'.
20040926	Minor updates: possibly a fix to 'sltiu' (the imm value
		should be treated as signed, and then converted to unsigned,
		according to the MIPS64 manual), and removing the
		'last_was_rfe' stuff (again).
		OpenBSD/arc used speed-hack jumps with other deltas than just
		+/- 1 (it used -3 iirc), so the jump speedhack should now
		support any delta. Also adding bgtzl and blezl as possible
		instructions for the speed-hack jumps. (This needs to be
		tested more.)
20040928	Minor updates. Some ARC stuff ("arcdiag" runs now).
		cpu_register_dump() now also dumps coprocessor registers.
20040929	More ARC updates. Making the code look a tiny bit nicer
		than before. "arcdiag.ip22" works for -G22 (SGI-IP22).
		Apparently the overflow support in the 'add' instruction
		was incorrect, so I disabled it.
20041002	Trying to install Ultrix in the emulator, but the installer
		crashes; found (and fixed) the bug rather quickly: the "fix"
		I implemented a few days ago for the 'sub' instruction
		(according to the MIPS64 manual) caused the bug.
20041004	Changing the behaviour of the -j command line option. The
		default is now "" (or taken from the last filename given on
		the command line), not "netbsd". In practice, this doesn't
		change much, except that -j netbsd.pmax is no longer needed
		when installing NetBSD.
		Adding a COMPILE_DATE string to config.h.
20041007	Adding a NEC RISCserver 4200 model (-A6), and some more
		updates to the ARC component tree generator.
20041008	The 'll' instruction should be signed, not unsigned as before.
		This (and some other minor fixes) causes Irix on SGI-IP32 (O2)
		to actually boot far enough to print its first boot messages :)
		Working on some new dynamic bintrans code. Enough is now
		implemented so that the 'nop' instruction is translated
		and there is support for Alpha, i386 and UltraSparc backends,
		but performance is about 50% worse than when running without
		bintrans. (This is as expected, though.)
20041009	Minor updates to the documentation.
		Using mprotect() to make sure that the code created dynamically
		by the bintrans subsystem is allowed to be executed. (This
		affects newer OpenBSD systems, and possibly others.)
		The translated code chunks now only get one argument passed to
		them, the (struct cpu *) of the current cpu.
20041010	Hack to dev_le.c which makes Ultrix accept the initialization
		of the LANCE controller. (This goes against the LANCE
		documentation though.)
		In src/net.c, a fix for Ultrix (which seems to send larger
		ethernet packets than the actual TCP/IP contents). The hack to
		dev_le.c and this fix is enough to let Ultrix access the
		Internet.
		For DECstation, when booting without a disk image (or when
		"-O" is used on the command line), use "tftp" instead of "rzX"
		for the boot string.
20041011	Adding cache size variables to the emul struct, so that these
		can be set on a per-machine basis (or potentially manually
		on the command line).
20041012	Mach/PMAX now passes the LK201 keyboard self-test (although
		the keyboard ID is still bogus).
20041013	Minor updates.
		Hacks to the ASC SCSI controller for Mach/PMAX, hopefully this
		will not break support for other OSes.
20041014	Minor fix to src/emul.c for reading bootblocks at the end of
		a disk or cdrom image (thanks to Alexandru Lazar for making me
		aware of this).
		Adding "gets()" to src/dec_prom.c.
		Working a bit on ARC stuff. Importing pica.h from NetBSD.
		Minor updates to the ARC component tree for PICA-61.
		Adding a dev_jazz.c (mostly for PICA-61).
		Renaming dev_jazz.c into dev_pica.c. Working on PICA timer
		and interrupt specifics.
20041016	Adding some dummy entries to lk201.c to reduce debug output.
		Some bintrans updates (don't run in delay slots or nullified
		slots, read directly from host memory and not via memory_rw(),
		try mmap() before malloc() at startup, and many other minor
		updates).
		Adding bintrans_mips.c for 64-bit MIPS hosts, but it is not
		used yet.
20041017	Minor updates.
20041018	Update to dev_mc146818 to allow Mach to boot a bit further.
		The "hardware random" in dev_mp.c now returns up to 64 bits
		of random.
20041019	Minor updates to the way cache sizes are used throughout the
		code. Should be mostly ok for R[234]x00.
		src/file.c now loads files using NO_EXCEPTIONS. Whether this
		is good or bad, I'm not sure.
20041020	Adding a Linksys WRT54G emulation skeleton (-H).
20041021	Minor updates.
		R1[024]000 cache size bits in the config register should now
		be ok.
		Trying to make dev_asc.c work better with PICA.
		More work on PICA interrupts (but they are broken now).
20041022	Generalizing the dev_vga text console device so that it can be
		used in other resolutions than just 80x25. Works with
		OpenBSD/arc.
		emul->boot_string_argument is now empty by default (except
		for DECstation modes, where it is "-a").
		Speedup of dev_ram by using mmap() instead of malloc().
		Using mmap() in memory.c as well, which reduces memory usage
		when emulating large memory sizes if the memory isn't actually
		written to.
20041023	Minor updates.
20041024	Updates to the PC-style keyboard controller, used by PICA.
		Updates to the PICA (Jazz) interrupt system. Both NetBSD/arc
		and OpenBSD/arc now reach userland with PICA emulation, and
		can be interacted with (there are a few programs on the
		INSTALL kernel ramdisks). In the case of OpenBSD, a VGA text
		console and PC-style keyboard controller is used, NetBSD
		runs on serial console.
		Adding a framework for DMA transfer for the ASC SCSI
		controller.
		Implementing a R4030 DMA controller for PICA, enough to let
		OpenBSD/arc and NetBSD/arc be installed on an emulated
		Pica. :-)
		Updates to the documentation.
20041025	Working on ISA interrupts for PICA.
		Adding an Olivetti M700 emulation mode (-A7).
		Better separation of PICA and M700 stuff (which I accidentally
		mixed up before, I thought the M700 Linux kernel would 
		also work on PICA because it almost booted).
		Writing a skeleton G364 framebuffer for M700, enough to show
		the Linux penguin and some text, although scrolling isn't
		correctly implemented yet.
		Adding a dummy SONIC (ethernet) device, dev_sn, for PICA.
		Fixing the passing of OSLOADOPTIONS for ARC, the default is
		now "-aN" which works fine with OpenBSD/arc and NetBSD/arc.
20041027	Minor updates.
20041029	Adding a Sony NeWS "newsmips" emulation mode skeleton (-f).
		Found and fixed a bug which prevented Linux/IP32 from running
		(the speed-hack-jump-optimization fix I made a few weeks ago
		was buggy).
		Adding the trunc.w.fmt and trunc.l.fmt instructions, although
		the are probably not really tested yet.
		Changes to how floating point values are handled in
		src/coproc.c, but right now it is probably very unstable.
20041101	I had accidentally removed the instructions on how to install
		Ultrix from doc/index.html. They are back now.
		Adding a -Z option, which makes it easier to run dual- or
		tripple-head with Ultrix. (Default nr of graphics cards
		without -X is 0, with -X is 1.)
		Minor update which makes it possible to switch to the left
		monitor when running tripple-head, not just right as before.
		When using more than one framebuffer window, and the host's
		mouse cursor is in a different window than the emulated mouse
		cursor, the emulated mouse will now try to move "very far",
		so that it in practice changes screen.
		Running Ultrix with dual- and tripple-head now feels really
		great.
20041101(later)	OpenBSD/arc and Linux/Olivetti-M700 don't both work at the
		same time with the speed-hack stuff. So, from now on, you
		need to add -J for Linux, and add nothing for openbsd.
20041102	Minor update for OSF/1 V4.0 (include sys/time.h in src/net.c
		and add -D_POSIX_PII_SOCKET to the C compiler flags).
20041103	Minor updates for the release.
		For some reason, Mach/PMAX caused the emulator to bug out on
		SunOS/sparc64 (compiled in 64-bit mode); a minor update/hack
		to dev_asc fixed this.

==============  RELEASE 0.2.2  ==============

20041103	Minor updates.
20041104	Minor updates.
20041105	Running with different framebuffer windows on different X11
		displays works now (even with different bit depths and
		endiannesses on different displays). A new command line option
		(-z) adds DISPLAYs that should be used.
		Update regarding how DECstation BT459 cursors are used;
		transparency :-) and some other bug fixes.
20041106	More bt459 updates. The cursor color seems to be correct for
		NetBSD, OpenBSD, Ultrix, and Sprite.
		Some minor bintrans updates (redesigning some things).
20041107	More bintrans updates (probably broken for non-Alpha targets).
		Moving doc/mips64emul.1 to man/.
20041108	Some updates.
20041109	More updates. Bintrans experiments mostly.
20041110	Some minor bintrans updates.
20041111	Minor updates.
20041112	A little rewrite of the bintrans system (again :-), this time
		a lot more naďve and non-optimizing, in order to support delay
		slots in a much simpler way.
		Ultrix 4.5 boots into a usable desktop on my home machine in
		3min 28sec, compared to 6-8 minutes without bintrans.
20041113	Some minor bintrans updates.
20041114	More bintrans updates. Ultrix now boots in exactly 3 minutes
		on my home machine.
20041115	More bintrans updates.
20041116	Bintrans updates.
20041117	Working on dev_dec_ioasic and related issues.
		Adding support for letting translated code access devices in
		some cases (such as framebuffers).
20041118	Moving some MIPS registers into Alpha registers, which gives
		a speed improvement.
		Beginning to write an i386 bintrans backend. Skeleton stuff
		works, lui, jr/jalr, addiu/daddiu/andi/ori/xori, j/jal,
		addu/daddu/subu/xor/or/nor/and.
20041119	dsubu/sll/srl/sra, rfe,mfc0,dmfc0, beq,bne, delayed branches.
		Some load/store (but not for bigendian emulation yet.)
		Time to reach Ultrix 4.5's graphical login on a 2.8 GHz Xeon
		host is now down to 20 seconds!
		Adding bgez, bltz, bgtz, and blez to the i386 backend.
20041120	Minor updates (bintrans related mostly).
		Time to reach Ultrix login on the Xeon is now 11 seconds.
		Adding 'mult', 'multu' and a some parts of mtc0 to the Alpha
		backend.
		The transparency updates to the X11 cursor support made the
		OpenBSD/arc cursor disappear; that has been fixed now.
		Unfortunately, something with Acer Pica emulation is broken
		when bintrans is enabled.
20041121	Making tlbwr, tlbwi, tlbp, tlbr callable directly from
		translated code.
		Adding sltiu, slti, slt, and sltu to the i386 backend.
20041122	More bintrans updates.
		With the Alpha backend, the status and entryhi registers
		can (in some cases) be written without exiting to the main
		loop. Ultrix boot time until a usable desktop is reached
		is about 1 min 35 seconds on the 533 MHz pca56.
		Adding srlv, srav, and sllv to the i386 backend.
20041123	Removing the special handling of high physical addresses for
		DECstation emulation from the main memory handling code, and
		replacing it with a mirror device instead. (This results in
		a tiny increase in performance, and cleaner code.)
		Various minor updates.
20041124	Ripping out _all_ bintrans load/store code, because I have
		a new idea I'd like to try out.
		A total rewrite of the load/store system. It works when
		emulating 32-bit MIPS, but not for 64-bit code yet.
		Some minor updates to the dev_fb, but no speed improvement.
		Making the 'le' ethernet device' SRAM work with bintrans.
20041125	Various updates.
		Adding a little "bootup logo" to the framebuffer.
		There is now one translate_address() for R3000-style MMUs,
		and one for the other types. (This gives a tiny speed
		improvement.)
20041126	Minor updates, bintrans.
		Fixing the bug which caused OpenBSD/arc (R4000) to bug out;
		it was introduced between the 7:th and 10:th of November
		when moving up the check for interrupts to above the code
		which runs bintrans code, in src/cpu.c.
		Adding movn and movz to the Alpha bintrans backend.
20041127	Various minor updates.
20041128	Making the R2000/R3000 caches work with bintrans, even in
		isolated mode. (Not true cache emulation, but it works with
		NetBSD/pmax, OpenBSD/pmax, and Ultrix.)
		Making the default cache size for R3000 4KB instr, 4 KB data;
		a real R3000 could have 64KB each, but emulated OSes run
		faster when they think the cache is smaller :-)
		Updates to the i386 backend: the nr of executed instructions
		is now placed in ebp at all times, and some support for
		mtc0 similar to how it is done in the Alpha backend has been
		added. A full NetBSD/pmax 1.6.2 install can now be done in
		5 minutes 35 seconds, on a 2.8 GHz Xeon host (with -bD2 -M20).
		Adding mult and multu to the i386 bintrans backend.
		Reducing the number of malloc/free calls used by the
		diskimage subsystem.
20041129	Minor updates to the Alpha bintrans backend.
20041130	Trying to fix the bug which prevents Linux from working
		with bintrans. It _seems_ to work now. (Pages could in some
		cases be written to after they were translated, but that
		has been fixed now.)
		A couple of other minor fixes.
		Minor updates to the Alpha backend (directly using Alpha
		registers in some cases, instead of loading into temporaries).
		Updates to the i386 backend (special hacks for 32-bit
		MIPS emulation, which are fast on i386, for example only
		updating half of the pc register).
20041201	More updates to the i386 backend, similar to those yesterday.
		Preparing for release 0.2.3.
		Adding a generic load/store mechanism, which is used when the
		32-bit optimized version cannot be used (for R4000 etc).

==============  RELEASE 0.2.3  ==============

20041202	If ALWAYS_SIGNEXTEND_32 is defined in misc.h, and an
		incorrectly extended register is detected, the emulator now
		exits instead of continues.
		Removing the LAST_USED_TLB_EXPERIMENT stuff.
		Minor updates to work better with Windows NT's ARCINST.EXE;
		printing 0x9b via arcbios becomes ESC + '[', and the ARC
		memory descriptor stuff has been generalized a bit more.
		Adding arbios hacks for Open(), Seek(), GetRelativeTime(),
		and Read() to allow WinNT's SETUPLDR to read the filesystem
		on the diskimage used for booting.
20041203	Adding a terminal emulation layer which converts arcbios
		stdout writes to "VGA text console" cell characters. Seems
		to work with Windows NT and arcdiag.
		Adding a 8x8 font to dev_vga.
		Adding more ARC components to the component tree (for PICA
		emulation).
20041204	Minor updates.
		More updates to dev_vga. Adding a 8x10 font.
		Adding a hack so that the framebuffer logo is visible at
		startup with dev_vga. (It disappears at the first scroll.)
		A minor fix for a bug which was triggered when running
		dual- or tripple-head, on 2 or 3 actual X11 displays.
20041205	Fixing a bintrans bug.
		Some other minor updates (some of them bintrans related).
20041206	Moving the web page to http://gavare.se.
		Adding a hack for mmap() which supports anonymous mapping
		using /dev/zero, but not using MAP_ANON{,YMOUS}.
		Separating out opcodes.h, cop0.h, and cpu_types.h from misc.h.
20041207	Minor bintrans update. (In some cases, it isn't necessary
		to return to the main loop, when translating from a new page.)
		Some other minor i386 bintrans backend optimizations.
		And some other minor updates.
		i386 backend update: the lowest 32 bits of the pc register
		are now placed in an i386 register.
20041208	Adding GetConfigurationData() and some support for config
		data, to src/arcbios.c.
		Adding a bogus 0xbd SCSI command (used by Windows NT). It is
		not listed in http://www.danbbs.dk/~dino/SCSI/SCSI2-D.html.
		If the framebuffer cursor contains more than 1 color, then
		the host's X11 cursor disappears. (Nice for DECstation
		emulation with emulated X.)
		For ARC and SGI emulation, if an exception occurs before an
		exception handler is installed, the emulator now exits
		nicely (as suggested by Alec Voropay).
		A couple of minor updates to the ARCBIOS emulation subsystem.
		The single step debugger is now automatically entered when
		all CPUs have stopped running, unless there was a clean
		shutdown of some kind (PROM halt() call, or similar).
		Adding a -V option for starting up in a paused state, into
		the single-step debugger.
		Adding a note about 'mmon' to the documentation
		(http://www.brouhaha.com/~eric/software/mmon/).
20041209	Fixes to devices/console.c which makes cursor keys and such
		a bit more reliable.
		ARCBIOS hack/update which creates memory descriptors _after_
		loading the executable. (Seems to work with OpenBSD/arc,
		NetBSD/arc, arcdiag, IRIX, NetBSD/sgimips, OpenBSD/sgi, and
		some Windows NT executables.)
		ARCBIOS support for cursor keys (ESC + '[' ==> 0x9b).
		A bintrans update (for 32-bit emulation) which speeds up
		jumps between pages, if code is already translated.
		Changing the default bintrans cache from 20 to 24 MB.
20041210	Optimizing unaligned load/stores a little bit in src/cpu.c.
		Omiting the check for nr of executed bintrans instructions
		on some forward jumps.
		Adding the 'syscall' and 'break' instructions to the
		bintrans backends.
		Allowing more bits of the status register to be written to
		from within inside translated code, on R3000.
		Getting rid of the final pixel when hiding the host's mouse
		cursor.
		store_buf() now copies data 8 or 4 bytes at a time, when
		possible. (This speeds up emulated ROM disk reads, etc.)
		Tiny bug fix: coprocessor unusable exceptions are now also
		generated (for coproc 1..3) even when in kernel mode, if the
		coprocessors are not enabled. This allows a Debian installation
		to proceed further than before. (It's still very unstable,
		though.)
20041212	Updating doc/index.html with better Debian installation
		instructions.
		If SLOWSERIALINTERRUPTS is defined at compile time, interrupts
		from the dc7085 device will not come as often as they normally
		do. This makes Debian seem more stable.
		Decreasing the bintrans cache to 20 MB again.
		Updating some files in preparation for a 0.2.4 release.
20041213	Updating the docs on how to install NetBSD 2.0/pmax, and also
		some updates to the section on installing Debian.
		32-bit bintrans backend optimization: don't inline large
		chunks of code, such as general jumps.
20041214	Minor fix for coproc unusable for R4000 (it's the PC that,
		matters, not the KSU bits).
		Separating out the debugger from emul.c into debugger.c.
		Rewriting parts of the debugger.
		Removing the -U command line option, as it wasn't really
		useful. Also removing the -P option.
		Renaming all instances of dumppoint to breakpoint, as that
		is what it really is.
		When a breakpoint is reached, the single-step debugger is
		entered, instead of just turning on instruction trace.
		Adding a 'breakpoints' debugger command.
		Better fix for coproc unusable on R4000: the KSU bits matter,
		but the ERL and EXL bits override that.
		Fix which allows Debian to boot directly from a disk image
		(with DELO). (It reads multiple separate areas from disk.)
		Update to the SLOWSERIALINTERRUPTS stuff, making it even
		slower.
		Fixes based on feedback from Alec Voropay (-Q with ARC
		emulation skips the setup of arcbios data structures in
		memory, and no sign-extension _after_ writing a 32-bit
		value to a 64-bit coproc 0 register).
		Adding a 'devices' command to the debugger.
		The 'registers' and 'tlbdump' commands now take an optional
		argument (a cpu id).
		Adding rudimentary tab-completion and cursor key stuff to
		debugger_readline().
		Adding some more debugger commands: 'bintrans' and 'machine'.
20041215	Adding a 'devstate' command; implementing a skeleton for a
		state function for the bt459 device.
		Implementing yet another variant of the SLOWSERIALINTERRUPTS
		stuff.
		Implementing more of the different exception offsets (taking
		CAUSE_IV and STATUS_BEV into account).
		hpc_bootinfo should now be correctly filled on big-endian
		hosts.
		Always shift left by 12, not by pageshift, to get physical
		addresses on MMU4K etc. (Thanks to Alec Voropay for noticing
		this.)
20041216	The KN02's CSR can now be read from bintranslated code.
		Adding a dummy dev_sgi_mec.
20041217	The default framebuffer and model settings for -F (hpcmips)
		should now be almost like Cassiopeia E-500.
		Changing -DSLOWSERIALINTERRUPTS into a command line option, -U.
20041218	Continuing a little bit on the mec controller.
		Removing lots of #include <math.h> that weren't really used.
20041219	Fixing stuff that broke because of the pageshift bugfix.
		Adding an argument to the s (step) debugger command, for doing
		more than 1 step at a time.
		ARCBIOS components representing disk images are now created
		to actually match the disk images in use, and some other
		arcbios-related updates; adding a dummy GetComponent().
		Adding a 'lookup' command to the debugger, for symbol lookups.
		Adding a "NEC Express RISCserver" mode (NEC-R96, -A8).
		Adding a dummy ARCBIOS GetFileInformation(), GetTime(), and
		SetEnvironmentVariable().
20041220	Improved command line editing (including command history)
		in the debugger.
		Separating some more .h files from each other, and fixing
		some Solaris compiler warnings.
20041221	Minor updates.
20041222	Minor updates; hpcmips (BE300, VR41xx) stuff.
		The 'register' debugger command is now 'reg', and it can
		be used to modify registers, not just read them.
		The syntax for hpcmips (-F) is now -F xx, where xx is a
		machine model identifier. (1 = BE300.)
20041223	Some really minor updates.
20041226	Minor updates to doc/index.html (NetBSD 1.6.2 -> 2.0, and
		some other rearrangements).
		Many updates to the debugger (better register manipulation,
		breakpoint manipulation, and other updates).
		Fix to dev_cons.c to allow the regression tests to work again.
		The configure script now tries to detect the presence of a
		MIPS cross compiler. (Used by "make regtest".)
		Regression tests are now run both with and without bintrans.
20041227	Some hacks to the VR41xx code to allow Linux for BE300 to
		get far enough to show the penguin on the framebuffer.
20041228	Merging dev_kn01_csr.c and dev_vdac.c into dev_kn01.c.
20041229	Various updates to the debugger (nicer tlb output and other
		things).
		Some floating point fixes in src/coproc.c (mov is not
		an arithmetic instruction), and in src/cpu.c (ldcX/sdcX in
		32-bit mode uses register pairs).
		'-O' now also affects the bootstring for SGI and ARC emulation.
		Bintrans updates (slightly faster 32-bit load/store on alpha).
		Updates to the i386 backend too, but no real speed improvement.
20041230	Cleaning up parts of the 64-bit virtual-to-physical code for
		R10000, and per-machine default TLB entries can now be set
		for SGI and ARC machines.
		Fix: SGI-IP27 is ARC64, not ARCS.
20050101	Minor updates.
20050102	Minor updates.
		Fixing a 32-bit 'addu' bug in the bintrans backends.
		Allowing fast load/stores even in 64-bit bintrans mode, if
		the top 32 bits are either 0x00000000 or 0xffffffff (for Alpha
		only).
		Re-enabling ctc0/cfc0 (but what do they do?).
		Adding beql, bnel, blezl, and bgtzl to the Alpha backend.
20050103	Adding fast 32-bit load/store for 64-bit mode emulation to
		the i386 backend too (similar to the Alpha code). Not really
		tested yet, though.
		Adding an incomplete regression test case for lwl/lwr/ldl/ldr.
		Playing around with bintranslated lwl and lwr for Alpha.
20040104	Changing many occurances of pica to jazz.
		Various other updates.
20050105	Fixing some more bintrans bugs (both Alpha and i386).
		Unaligned stores that cause tlb refill exceptions should now
		cause TLBS exceptions, not TLBL.
		Adding experimental swl and swr to the Alpha backend.
		Adding lwl, lwr, swl, and swr to the i386 backend.
20050106	Adding another hpcmips model (Casio E-105, -F2), and doing
		some updates to the VR41xx code. NetBSD/hpcmips prints some
		boot messages.
20050108	Minor updates.
20050109	dev_dec5500_ioboard.c and dev_sgec.c => dev_kn220.c.
		dev_crime.c, _mace.c, and _macepci.c => dev_sgi_ip32.c.
		Also adding dev_sgi_mec, _ust, and _mte into dev_sgi_ip32.c.
		A slight license change. Still revised BSD-style, though.
		memory_v2p.c is now included separately for MMU10K and
		MMU8K.
		Fixing a NS16550 bug, triggered by NetBSD 2.0, but not 1.6.2.
		Refreshing the UltraSPARC bintrans backend skeleton.
		Merging dev_decbi, _deccca, and _decxmi into dev_dec5800.c.
		Sparc backend instructions done so far: mthi/mtlo/mfhi/mflo,
		lui, addu, daddu, subu, dsubu, and, or, nor, xor, sll, dsll,
		srl, and sra.
		Adding more sparc backend instructions: addiu, daddiu, xori,
		ori, andi, srlv, srav, sllv, slt, sltu, slti, sltiu.
20050110	Changing the default bintrans cache to 16 MB, and some other
		minor updates.
		Adding div and divu to the i386 backend (but not Alpha yet).
		More work on ARCBIOS emulation.
		Trying to find a bug which affects Linux on Playstation 2 in
		bintrans mode.
20050111	Moving around some Playstation 2 stuff, but I haven't found
		the bug yet. It is triggered by load/stores.
		More ARCBIOS updates, enough to let Windows NT partition
		disks in some rudimentary fashion.
20050112	Testing for release 0.2.4.
		Fixes to suppress compiler warnings.

==============  RELEASE 0.2.4  ==============

20050113	Minor updates.
20050114	Fix to the Alpha bintrans backend to allow compilation with
		old versions of gcc (2.95.4).

==============  RELEASE 0.2.4.1  ==============

20050115	Various updates and fixes: some IP32 stuff, the debugger,
		ns16550 loopback tx isn't transmitted out anymore, ...
		Removing old/broken R10000 cache hacks, which weren't really
		used.
20050116	Minor updates to the documentation on using PROM images.
		Adding ARCBIOS function 0x100 (used by IRIX when returning
		from main, but undocumented).
		MC146818 updates (mostly SGI-related).
		ARCS64 updates (testing with an OpenBSD snapshot in IP27
		mode). This causes Linux/IP30 to not work. Maybe IP27 and
		IP30 differ, even though both are 64-bit?
		Removing some nonsensical ARCS64 code from machine.c.
		Better handling of 128MB and 512MB memory offsets used by
		various SGI models.
		Trying to revert the ARCS64 changes (OpenBSD/sgi does
		seem to be aware of 64-bit vs 32-bit data structures in
		_some_ places, but not all), to make Linux/IP30 work again.
		Adding "power off" capability to the RTC, as used on IP32
		(and possibly IP30 and others).
		Some IP30 updates.
20050117	Debugger updates (symbolic register names instead of just rX,
		and using %08x instead of %016llx when emulating 32-bit CPUs
		in more places than before).
		Removing the dummy sgi_nasid and sgi_cpuinfo devices.
		Also using symbolic names for coprocessor 0 registers.
		Adding DEV_MP_MEMORY to dev_mp.c.
		Adding a 'put' command to the debugger.
		ARCBIOS function 0x100 used by IRIX seems to _NOT_ be a
		ReturnFromMain(), but something else undocumented.
		The count and compare registers are now 32-bit in all
		places, as they should be. (This causes, among other things,
		OpenBSD/sgi to not hang randomly in userspace anymore.)
		On breakpoints, the debugger is now entered _at_ the
		instruction at the breakpoint, not after it.
		Some cursor keys now work when inputed via X.
		Refreshing the MC146818 device a bit more.
20050118	Trying to add some support for less-than-4KB virtual pages,
		used by at least VR4131. Thanks to Alexander Yurchenko for
		noticing this. (I'm assuming for now that all R41xx work
		this way, which is not necessarily true.) It doesn't really
		work yet though.
		Renicing the "loading files" messages and other things
		displayed during startup.
		Changing the disassembly output of ori, xori, and andi to
		unsigned hex immediate, instead of decimal (as suggested
		by Alec Voropay).
		configure-script update for HP-UX, and switching from using
		inet_aton() to inet_pton() (as suggested by Nils Weller).
		Also adding -lnsl on Solaris, if required by inet_pton().
		Lots of minor R4100-related updates.
20050119	Correcting the R4100 config register in src/coproc.c, and
		a minor update to dev_vr41xx.
		Finally began a redesign/remodelling/cleanup that I have had
		in mind for quite some time... moving many things that were
		in struct emul into a new struct machine.
		Userland emulation now works with bintrans.
		Refreshing the LANCE controller (dev_le.c).
		Fixing the LK201 keyboard id.
20050120	Continuing on the remodelling/cleanup.
		Fixing the SCSI bug (which was triggered sometimes by
		NetBSD 2.0/pmax on Linux/i386 hosts).
		Adding a speed-limit hack to the mc146818 device when running
		in DECstation mode (limiting to emulated 30 MHz clock, so
		that Ultrix doesn't freak out).
		Adding an ugly workaround for the floating-point bug which
		is triggered when running NetBSD/pmax 2.0 on an Alpha host.
		The count/compare interrupt will not be triggered now, if
		the compare register is left untouched.
		Many, many other fixes...
20050121	Continuing the remodelling/cleanup. (Mostly working on the
		network stack, and on moving towards multiple emulations
		with multiple machines per emulation.)
		Fixbug: not clearing lowest parts of lo0 and hi on tlbr
		(seems to increase performance when emulating Linux?).
20050122	Continuing the remodelling/cleanup.
		Linux on DECstation uses a non-used part of the RTC registers
		for the year value; this is supported now, so Linux thinks
		it is 2005 and not 2000.
		Began hacking on something to reply to Debian's DHCP requests,
		but it's not working yet.
20050123	Continuing the remodelling/cleanup.
20050124	Continuing the remodelling/cleanup.
		Converting the dev_vga charcell memory to support direct
		bintrans access (similar to how dev_fb works), and fixing a
		couple of bintrans bugs in the process.
		The emulator now compiles under OpenBSD/arc 2.3 without
		crashing (mostly due to the bintrans fixes, but also some
		minor updates to the configure script).
20050125	Continuing the remodelling/cleanup.
		The '-a' option was missing in the Hello World example in the
		documentation. (Thanks to Soohyun Cho for noticing this.)
20050126	Continuing the remodelling/cleanup. Moving around stuff in
		the header files, etc. Adding a '-K' command line option, which
		forces the debugger to be entered at the exit of a simulation,
		regardless of failure or success. Beginning to work on the
		config file parser.
		Splitting doc/index.html into experiments.html, guestoses.html,
		intro.html, and misc.html.
		Updating the man page and adding a skeleton section about the
		configure files to doc/misc.html.
20050127	Minor documentation updates.
20050128	Continuing the remodelling/cleanup, mostly working on the
		config file parser (adding a couple of machine words, enough
		to run simple emulations, and adding support for multi-line
		comments using tuborgs).
		Removing some command line options for the least working
		emulation modes (-e, -f, -g, -E, -H), adding new -E and -e
		options for selecting machine type.
		Moving global variables from src/x11.c into struct machine (a
		bit buggy, but it seems to almost work).
20050129	Removing the Playstation 2 mode (-B) and hpcmips modes (-F)
		from the command line as well.
		Changing the -T command line option from meaning "trace on bad
		address" to meaning "enter the single-step debugger on bad
		address".
		More updates to the configuration file parser (nested tuborg
		comments, more options, ...).
		Making -s a global setting, not just affecting one machine.
		Trying to fix the X11 event stuff... but it's so ugly that it
		must be rewritten later.
		Continuing the multi-emul cleanup.
		Bugfixes and other updates to dev_vga.
20050130	Continuing the remodelling/cleanup. Finally moving out the
		MIPS dependant stuff of the cpu struct into its own struct.
		Renaming cpu.c to cpu_mips.c, and cpu_common.c to cpu.c.
		Adding a dummy cpu_ppc.c.
		Removing the UltraSPARC bintrans backend.
		Many other minor updates.
		src/file.c should now be free from MIPS-dependancies.
20050131	Continuing a little bit more on src/file.c. PPC ELFs can now
		be loaded, it seems.
		Continuing on src/cpu_ppc.c.
		'mips' is undefined by the configure script, if it is defined
		by default. (Fixes build on at least OpenBSD/arc and
		NetBSD/arc, where gcc defines 'mips'.)
		A couple of other minor fixes.
		Removing the "Changing framebuffer resolution" section from
		doc/misc.h (because it's buggy and not very useful anway).
		Adding a mystrtoull(), used on systems where there is no
		strtoull() in libc.
		Adding 'add_x11_display' to the configure file parser 
		(corresponding to the -z command line option).
		Continuing the multi-emul machine cleanup.
20050201	Minor updates (man page, RELEASE, README).
		Continuing the cleanup.
		Adding a 'name' field to the emul struct, and adding a command
		to the debugger ("focus") to make it possible to switch focus
		to different machines (in different emuls).
		Beginning to work on the PPC disassembler etc. Hello World
		for linux-ppc64 can be disassembled :-)
20050202	Adding a hack for reading symbols from Microsoft's variant of
		COFF files.
		Adding a dummy cpu_sparc.c and include/cpu_sparc.h.
		Cleaning up more to support multiple cpu families.
		Various other minor updates.
		Fixing another old-gcc-on-Alpha problem.
20050203	Bintrans cache size is now variable, settable by a new
		configuration file option 'bintrans_size'.
		The debugger can now theoretically call disassembler functions
		for cpu families with non-fixed instruction word length.
		Working more on the mec controller. It now works well enough
		to let both NetBSD/sgimips and OpenBSD/sgi connect to the
		outside world using ftp :-)
		Continuing on the cleanup of the networking subsystem.
20050204	Continuing the cleanup.
		Working on a way to use separate xterms for serial ports and
		other console input, when emulating multiple machines (or one
		machine with multiple serial lines active).
20050205	Minor documentation updates.
20050206	Moving console.c from devices/ to src/, and continuing the
		work on using separate windows for each serial console.
		Trying to get OpenBSD/sgi to boot with root-on-nfs on an
		emulated NetBSD/pmax server, but no success in setting up
		the server yet.
20050207	Continuing on the console cleanup.
		Adding a 'start_paused' configuration file option, and a
		'pause' command to the debugger.
20050208	Everything now builds with --withoutmips.
		Continuing on the documentation on how to run OpenBSD/sgi, but
		no actual success yet.
		sizeof => (int)sizeof in the configure script (as suggested by
		Nils Weller).
20050209	Adding a check for -lm to the configure script.
		Continuing on the cleanup: trying to make memory_rw non-MIPS
		dependant.
		Trying to make a better fix for the cdrom-block-size problems
		on FreeBSD. (It now works with a Windows NT 4.0 cdrom in my
		drive.)
		Began a clean-up of the userland subsystem.
20050210	Continuing the userland cleanup.
		IBM's Hello World example for Linux/PPC64 runs fine now.
20050211	Continuing the cleanup. Removing the --userland configure
		option (because support for userland is always included now).
		Working more on getting OpenBSD/sgi to boot with root on
		nfs. (Booting with the ramdisk kernel, and mounting root via
		nfs works, but not yet from the generic kernel.)
		Major update to the manpage.
		Removing the -G command line option (SGI modes).
20050212	Updating the documentation (experimental devices: dev_cons
		and dev_mp, better hello.c, and some other things).
20050213	Some minor fixes: documentation, 80 columns in some source
		files, better configure script options.
		Adding some more PPC instructions.
		Added a NOFPU flag to the MIPS cpu flags, so that executing
		FPU instructions on for example VR4xxx will fail (as suggested
		by Alexander Yurchenko).
20050214	Implementing more PPC instructions.
		Adding dev_pmppc.
20050215	Continuing the work on PPC emulation. Adding a (mostly non-
		working) NetBSD/powerpc userland mode, a (buggy)
		show_trace_tree thing (simliar to the MIPS version).
20050216	Continuing...
20050218	Continuing the clean-up. (Merging the devices and devstate
		debugger commands, more 80-column cleanup, some documentation
		updates, ...).
20050219	Removing the -D, -A, and -a command line options. Updating the
		documentation, in preparation for the next release.
		Adding interrupt stuff to dev_cons.
		Single-stepping now looks/works better with bintrans enabled.
		Beginning the first phase of release testing; various minor
		updates to make everything build cleanly on Solaris.
20050220	Continuing testing for the release...
                
==============  RELEASE 0.3  ==============

20050221	Minor updates. Some more clean-up.
		Beginning on the new device registry stuff.
20050222	Continuing on the device stuff, and doing various other kinds
		of clean-up.
		Adding a dummy BeBox mode.
		Making the pc register common for all cpu families.
		Adding some more PPC instructions and fixing some bugs.
20050223	Continuing on the BeBox stuff, and adding more instructions.
		Adding an ns16550 to the VR4131 emulation (which is probably
		a close enough fake to the VR4131's SIU unit).
20050224	Minor updates. Adding dummy PReP, macppc, and DB64360 modes.
		Continuing on the device registry rewrite.
20050225	Continuing on the device stuff.
20050226	Continuing more on the device rewrite.
		Separating the "testmips" machine into testmips and baremips
		(and similarly with the ppc machine).
		Redesigning the device registry again :-)
		Adding a "device" command to the config file parser.
		Adding "device add" and "device remove" to the debugger.
		Removing pcidevs.h, because it was almost unused.
20050228	Correcting the Sprite disk image url in the documentation.
20050301	Adding an URISC cpu emulation mode (single-opcode machine).
20050303	Adding some files to the experiments directory (rssb_as.c,
		rssb_as.README, urisc_test.s).
		Continuing on the device stuff.
20050304	Minor documentation update. Also, the SPARC, PPC, and URISC
		modes are now enabled by default in the configure script.
		Some minor PPC updates (adding a VGA device to the bebox
		emulation mode).
20050305	Moving the static i386 bintrans runchunk code snippet (and the
		others) to be dynamically generated. (This allows the code to
		compile on i386 with old gcc.)
		Loading PPC64 ELFs now sets R2 to the TOC base.
		Changing the name of the emulator from mips64emul to GXemul.
		Splitting out the configuration file part of the documentation
		into its own file (configfiles.html).
20050306	Some really minor documentation updates.
		Adding a -D command line option (for "fully deterministic"
		behaviour).
20050308	Minor PPC updates. Adding a dummy OpenFirmware emulation layer.
20050309	Adding a hack for systems without inet_pton (such as Cygwin in
		Windows) as suggested by Soohyun Cho. (And updating the
		configure script too.)
		Adding a dummy HPPA cpu family.
		Some more OpenFirmware updates.
		Faster loading of badly aligned ELF regions.
20050311	Minor updates. Adding a dummy "NEC MobilePro 780" hpcmips
		machine mode; disabling direct bintrans access to framebuffers
		that are not 4K page aligned.
20050312	Adding an ugly KIU hack to the VR41xx device (which enables
		NetBSD/hpcmips MobilePro 780 keyboard input).
20050313	Adding a dummy "pcic" device (a pcmcia card controller).
		Adding a dummy Alpha cpu emulation mode.
		Fixing a strcmp length bug (thanks to Alexander Yurchenko for
		noticing the bug).
20050314	Some minor bintrans-related updates in preparation for a new
		bintrans subsystem: command line option -b now means "old
		bintrans", -B means "disable bintrans", and using no option at
		all selects "new bintrans".
		Better generation of MAC addresses when emulating multiple
		machines and/or NICs.
		Minor documentation updates (regarding configuration files).
20050315	Adding dummy standby, suspend, and hibernate MIPS opcodes.
		RTC interrupt hack for VR4121 (hpcmips).
		Enough of the pcic is now emulated to let NetBSD/hpcmips detect
		a PCMCIA harddisk controller card (but there is no support for
		ISA/PCMCIA interrupts yet).
		Adding preliminary instructions on how to install
		NetBSD/hpcmips.
		Continuing the attempt to get harddisks working with interrupts
		(pcic, wdc on hpcmips).
20050318	Minor updates. (Fixing disassembly of MIPS bgtz etc., 
		continuing on the device cleanup, ...)
20050319	Minor updates.
20050320	Minor updates.
20050322	Various minor updates.
20050323	Some more minor updates.
20050328	VR41xx-related updates (keyboard stuff: the space key and
		shifted and ctrled keys are now working in userland (ie
		NetBSD/hpcmips' ramdisk installer).
		Also adding simple cursor key support to the VR41xx kiu.
20050329	Some progress on the wdc.
		Updating the documentation of how to (possibly) install
		NetBSD/hpcmips, once it is working.
		Adding delays before wdc interrupts; this allows NetBSD
		2.0/hpcmips to be successfully installed!
		Mirroring physical addresses 0x8....... to 0x00000000 on
		hpcmips; this makes it possible to run X11 inside
		NetBSD/hpcmips :-)
		Updating the documentation regarding NetBSD/hpcmips.
		Fixing 16-bit vs 15-bit color in dev_fb.
20050330	Print a warning when the user attempts to load a gzipped
		file. (Thanks to Juan RP for making me aware of this "bug".)
20050331	Importing aic7xxx_reg.h from NetBSD.
		Adding a "-x" command line option, which forces xterms for
		each emulated serial port to always be opened.
		Adding a MobilePro 770 mode (same as 780, but different
		framebuffer address which allows bintrans = fast scrolling),
		and a MobilePro 800 (with 800x600 pixels framebuffer :-).
20050401	Minor updates.
20050402	Minor updates. (The standby and suspend instructions are
		bintransed as NOPs, and some minor documentation updates.)
20050403	Adding an Agenda VR3 mode, and playing around with a Linux
		kernel image, but not much success yet.
		Changing BIFB_D16_FFFF -> BIFB_D16_0000 for the hpcmips 
		framebuffers, causing NetBSD to boot with correct colors.
		New syntax for loading raw files: loadaddr:skiplen:
		initialpc:filename. (This is necessary to boot the Linux VR3
		kernels.)
		The Linux VR3 kernel boots in both serial console mode and
		using the framebuffer, but it panics relatively early.
20050404	Continuing on the AHC, and some other minor updates.
20050405	Adding a note in doc/experimental.html about "root1.2.6.cramfs"
		(thanks to Alec Voropay for noticing that it wasn't part
		of root1.2.6.kernel-8.00).
		Also adding a note about another cramfs image.
		-o options are now added to the command line passed to the
		Linux kernel, when emulating the VR3.
		Adding a MobilePro 880 mode, and a dummy IBM WorkPad Z50 mode.
20050406	Connecting the VR3 serial controller to irq 9 (Linux calls this
		irq 17), and some other interrupt-related cleanups.
		Reducing the memory overhead per bintranslated page. (Hopefully
		this makes things faster, or at least not slower...)
20050407	Some more cleanup regarding command line argument passing for
		the hpcmips modes.
		Playing with Linux kernels for MobilePro 770 and 800; they get
		as far as mounting a root filesystem, but then crash.
		Doing some testing for the next release.

==============  RELEASE 0.3.1  ==============


1 dpavlin 2 /*
2     * Copyright (C) 2003-2005 Anders Gavare. All rights reserved.
3     *
4     * Redistribution and use in source and binary forms, with or without
5     * modification, are permitted provided that the following conditions are met:
6     *
7     * 1. Redistributions of source code must retain the above copyright
8     * notice, this list of conditions and the following disclaimer.
9     * 2. Redistributions in binary form must reproduce the above copyright
10     * notice, this list of conditions and the following disclaimer in the
11     * documentation and/or other materials provided with the distribution.
12     * 3. The name of the author may not be used to endorse or promote products
13     * derived from this software without specific prior written permission.
14     *
15     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18     * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25     * SUCH DAMAGE.
26     *
27     *
28     * $Id: debugger.c,v 1.98 2005/03/20 20:27:26 debug Exp $
29     *
30     * Single-step debugger.
31     *
32     *
33     * TODO:
34     *
35     * This entire module is very much non-reentrant. :-/
36     *
37     * Add more functionality that already exists elsewhere in the emulator.
38     *
39     * More generic expression evaluator (for example + - * / between multiple
40     * terms), including _TAB COMPLETION_ of symbols and register names!
41     *
42     * Nicer looking output of register dumps, floating point registers,
43     * etc. Warn about weird/invalid register contents.
44     *
45     * Ctrl-C doesn't enter the debugger on some OSes (HP-UX?)...
46     *
47     * Many other TODOs.
48     */
49    
50     #include <ctype.h>
51     #include <signal.h>
52     #include <stdio.h>
53     #include <stdlib.h>
54     #include <string.h>
55     #include <unistd.h>
56    
57     #include "console.h"
58     #include "cpu.h"
59     #include "device.h"
60     #include "debugger.h"
61     #include "diskimage.h"
62     #include "emul.h"
63     #include "machine.h"
64     #include "memory.h"
65     #include "misc.h"
66     #include "net.h"
67     #include "x11.h"
68    
69    
70     extern int extra_argc;
71     extern char **extra_argv;
72    
73     extern int quiet_mode;
74    
75    
76     /*
77     * Global debugger variables:
78     */
79    
80     volatile int single_step = 0;
81     int force_debugger_at_exit = 0;
82     int show_opcode_statistics = 0;
83    
84     int old_instruction_trace = 0;
85     int old_quiet_mode = 0;
86     int old_show_trace_tree = 0;
87    
88    
89     /*
90     * Private (global) debugger variables:
91     */
92    
93     static volatile int ctrl_c;
94    
95     static int debugger_n_emuls;
96     static struct emul **debugger_emuls;
97     static struct emul *debugger_emul;
98     static struct machine *debugger_machine;
99    
100     static int exit_debugger;
101     static int n_steps_left_before_interaction = 0;
102    
103     #define MAX_CMD_LEN 70
104     #define N_PREVIOUS_CMDS 150
105     static char *last_cmd[N_PREVIOUS_CMDS];
106     static int last_cmd_index;
107    
108     static char repeat_cmd[MAX_CMD_LEN + 1];
109    
110     #define MAGIC_UNTOUCHED 0x98ca76c2ffcc0011ULL
111    
112     static uint64_t last_dump_addr = MAGIC_UNTOUCHED;
113     static uint64_t last_unasm_addr = MAGIC_UNTOUCHED;
114    
115    
116     /*
117     * debugger_activate():
118     *
119     * This is a signal handler for CTRL-C. It shouldn't be called directly,
120     * but setup code in emul.c sets the CTRL-C signal handler to use this
121     * function.
122     */
123     void debugger_activate(int x)
124     {
125     ctrl_c = 1;
126    
127     if (single_step) {
128     /* Already in the debugger. Do nothing. */
129     int i;
130     for (i=0; i<MAX_CMD_LEN+1; i++)
131     console_makeavail(MAIN_CONSOLE, '\b');
132     console_makeavail(MAIN_CONSOLE, ' ');
133     console_makeavail(MAIN_CONSOLE, '\n');
134     printf("^C");
135     fflush(stdout);
136     } else {
137     /* Enter the single step debugger. */
138     single_step = 1;
139    
140     /* Discard any chars in the input queue: */
141     while (console_charavail(MAIN_CONSOLE))
142     console_readchar(MAIN_CONSOLE);
143     }
144    
145     /* Clear the repeat-command buffer: */
146     repeat_cmd[0] = '\0';
147    
148     /* Reactivate the signal handler: */
149     signal(SIGINT, debugger_activate);
150     }
151    
152    
153     /*
154     * debugger_parse_name():
155     *
156     * This function reads a string, and tries to match it to a register name,
157     * a symbol, or treat it as a decimal numeric value.
158     *
159     * Some examples:
160     *
161     * "0x7fff1234" ==> numeric value (hex, in this case)
162     * "pc", "r5", "hi", "t4" ==> register (CPU dependant)
163     * "memcpy+64" ==> symbol (plus offset)
164     *
165     * Register names can be preceeded by "x:" where x is the CPU number. (CPU
166     * 0 is assumed by default.)
167     *
168     * To force detection of different types, a character can be added in front of
169     * the name: "$" for numeric values, "%" for registers, and "@" for symbols.
170     *
171     * Return value is:
172     *
173     * NAME_PARSE_NOMATCH no match
174     * NAME_PARSE_MULTIPLE multiple matches
175     *
176     * or one of these (and then *valuep is read or written, depending on
177     * the writeflag):
178     *
179     * NAME_PARSE_REGISTER a register
180     * NAME_PARSE_NUMBER a hex number
181     * NAME_PARSE_SYMBOL a symbol
182     */
183     #define NAME_PARSE_NOMATCH 0
184     #define NAME_PARSE_MULTIPLE 1
185     #define NAME_PARSE_REGISTER 2
186     #define NAME_PARSE_NUMBER 3
187     #define NAME_PARSE_SYMBOL 4
188     static int debugger_parse_name(struct machine *m, char *name, int writeflag,
189     uint64_t *valuep)
190     {
191     int match_register = 0, match_symbol = 0, match_numeric = 0;
192     int skip_register, skip_numeric, skip_symbol;
193    
194     if (m == NULL || name == NULL) {
195     fprintf(stderr, "debugger_parse_name(): NULL ptr\n");
196     exit(1);
197     }
198    
199     /* Warn about non-signextended values: */
200     if (writeflag &&
201     ((*valuep) >> 32) == 0 && (*valuep) & 0x80000000ULL)
202     printf("WARNING: The value is not sign-extended. "
203     "Is this what you intended?\n");
204    
205     skip_register = name[0] == '$' || name[0] == '@';
206     skip_numeric = name[0] == '%' || name[0] == '@';
207     skip_symbol = name[0] == '$' || name[0] == '%';
208    
209     /* Check for a register match: */
210     if (!skip_register && strlen(name) >= 1)
211     cpu_register_match(m, name, writeflag, valuep,
212     &match_register);
213    
214     /* Check for a number match: */
215     if (!skip_numeric && isdigit((int)name[0])) {
216     uint64_t x;
217     x = strtoull(name, NULL, 0);
218     if (writeflag) {
219     printf("You cannot assign like that.\n");
220     } else
221     *valuep = x;
222     match_numeric = 1;
223     }
224    
225     /* Check for a symbol match: */
226     if (!skip_symbol) {
227     int res;
228     char *p, *sn;
229     uint64_t newaddr, ofs = 0;
230    
231     sn = malloc(strlen(name) + 1);
232     if (sn == NULL) {
233     fprintf(stderr, "out of memory in debugger\n");
234     exit(1);
235     }
236     strcpy(sn, name);
237    
238     /* Is there a '+' in there? Then treat that as an offset: */
239     p = strchr(sn, '+');
240     if (p != NULL) {
241     *p = '\0';
242     ofs = strtoull(p+1, NULL, 0);
243     }
244    
245     res = get_symbol_addr(&m->symbol_context, sn, &newaddr);
246     if (res) {
247     if (writeflag) {
248     printf("You cannot assign like that.\n");
249     } else
250     *valuep = newaddr + ofs;
251     match_symbol = 1;
252     }
253    
254     free(sn);
255     }
256    
257     if (match_register + match_symbol + match_numeric > 1)
258     return NAME_PARSE_MULTIPLE;
259    
260     if (match_register)
261     return NAME_PARSE_REGISTER;
262     if (match_numeric)
263     return NAME_PARSE_NUMBER;
264     if (match_symbol)
265     return NAME_PARSE_SYMBOL;
266    
267     return NAME_PARSE_NOMATCH;
268     }
269    
270    
271     /*
272     * show_breakpoint():
273     */
274     static void show_breakpoint(struct machine *m, int i)
275     {
276     printf("%3i: 0x%016llx", i,
277     (long long)m->breakpoint_addr[i]);
278     if (m->breakpoint_string[i] != NULL)
279     printf(" (%s)", m->breakpoint_string[i]);
280     if (m->breakpoint_flags[i])
281     printf(": flags=0x%x", m->breakpoint_flags[i]);
282     printf("\n");
283     }
284    
285    
286     /****************************************************************************/
287    
288    
289     /*
290     * debugger_cmd_breakpoint():
291     *
292     * TODO: automagic "expansion" for the subcommand names (s => show).
293     */
294     static void debugger_cmd_breakpoint(struct machine *m, char *cmd_line)
295     {
296     int i, res;
297    
298     while (cmd_line[0] != '\0' && cmd_line[0] == ' ')
299     cmd_line ++;
300    
301     if (cmd_line[0] == '\0') {
302     printf("syntax: breakpoint subcmd [args...]\n");
303     printf("Available subcmds (and args) are:\n");
304     printf(" add addr add a breakpoint for address addr\n");
305     printf(" delete x delete breakpoint nr x\n");
306     printf(" show show current breakpoints\n");
307     return;
308     }
309    
310     if (strcmp(cmd_line, "show") == 0) {
311     if (m->n_breakpoints == 0)
312     printf("No breakpoints set.\n");
313     for (i=0; i<m->n_breakpoints; i++)
314     show_breakpoint(m, i);
315     return;
316     }
317    
318     if (strncmp(cmd_line, "delete ", 7) == 0) {
319     int x = atoi(cmd_line + 7);
320    
321     if (m->n_breakpoints == 0) {
322     printf("No breakpoints set.\n");
323     return;
324     }
325     if (x < 0 || x >= m->n_breakpoints) {
326     printf("Invalid breakpoint nr %i. Use 'breakpoint "
327     "show' to see the current breakpoints.\n", x);
328     return;
329     }
330    
331     free(m->breakpoint_string[x]);
332    
333     for (i=x; i<m->n_breakpoints-1; i++) {
334     m->breakpoint_addr[i] = m->breakpoint_addr[i+1];
335     m->breakpoint_string[i] = m->breakpoint_string[i+1];
336     m->breakpoint_flags[i] = m->breakpoint_flags[i+1];
337     }
338     m->n_breakpoints --;
339     return;
340     }
341    
342     if (strncmp(cmd_line, "add ", 4) == 0) {
343     uint64_t tmp;
344    
345     if (m->n_breakpoints >= MAX_BREAKPOINTS) {
346     printf("Too many breakpoints. (You need to recompile"
347     " gxemul to increase this. Max = %i.)\n",
348     MAX_BREAKPOINTS);
349     return;
350     }
351    
352     i = m->n_breakpoints;
353    
354     res = debugger_parse_name(m, cmd_line + 4, 0, &tmp);
355     if (!res) {
356     printf("Couldn't parse '%s'\n", cmd_line + 4);
357     return;
358     }
359    
360     m->breakpoint_string[i] = malloc(strlen(cmd_line+4) + 1);
361     if (m->breakpoint_string[i] == NULL) {
362     printf("out of memory in debugger_cmd_breakpoint()\n");
363     exit(1);
364     }
365     strcpy(m->breakpoint_string[i], cmd_line+4);
366     m->breakpoint_addr[i] = tmp;
367     m->breakpoint_flags[i] = 0;
368    
369     m->n_breakpoints ++;
370     show_breakpoint(m, i);
371     return;
372     }
373    
374     printf("Unknown breakpoint subcommand.\n");
375     }
376    
377    
378     /*
379     * debugger_cmd_bintrans():
380     */
381     static void debugger_cmd_bintrans(struct machine *m, char *cmd_line)
382     {
383     if (*cmd_line == '\0')
384     goto printstate;
385    
386     if (!m->bintrans_enabled_from_start) {
387     printf("You must have enabled bintrans from the start of the "
388     "simulation.\nIt is not possible to turn on afterwards.\n");
389     return;
390     }
391    
392     while (*cmd_line == ' ')
393     cmd_line++;
394    
395     /* Note: len 3 and 4, to include the NUL char. */
396     if (strncasecmp(cmd_line, "on", 3) == 0)
397     m->bintrans_enable = 1;
398     else if (strncasecmp(cmd_line, "off", 4) == 0)
399     m->bintrans_enable = 0;
400     else
401     printf("syntax: bintrans [on|off]\n");
402    
403     printstate:
404     printf("bintrans is now %s%s\n",
405     m->bintrans_enable? "ENABLED" : "disabled",
406     m->old_bintrans_enable? " (using the OLD bintrans system)" : "");
407     }
408    
409    
410     /*
411     * debugger_cmd_continue():
412     */
413     static void debugger_cmd_continue(struct machine *m, char *cmd_line)
414     {
415     if (*cmd_line) {
416     printf("syntax: continue\n");
417     return;
418     }
419    
420     exit_debugger = 1;
421     }
422    
423    
424     /*
425     * debugger_cmd_device():
426     */
427     static void debugger_cmd_device(struct machine *m, char *cmd_line)
428     {
429     int i, j;
430     struct memory *mem;
431     struct cpu *c;
432    
433     if (cmd_line[0] == '\0')
434     goto return_help;
435    
436     if (m->cpus == NULL) {
437     printf("No cpus (?)\n");
438     return;
439     }
440     c = m->cpus[m->bootstrap_cpu];
441     if (c == NULL) {
442     printf("m->cpus[m->bootstrap_cpu] = NULL\n");
443     return;
444     }
445     mem = m->cpus[m->bootstrap_cpu]->mem;
446    
447     if (m->cpus == NULL) {
448     printf("No cpus (?)\n");
449     return;
450     }
451     c = m->cpus[m->bootstrap_cpu];
452     if (c == NULL) {
453     printf("m->cpus[m->bootstrap_cpu] = NULL\n");
454     return;
455     }
456     mem = m->cpus[m->bootstrap_cpu]->mem;
457    
458     if (strcmp(cmd_line, "all") == 0) {
459     device_dumplist();
460     } else if (strncmp(cmd_line, "add ", 4) == 0) {
461     device_add(m, cmd_line+4);
462     } else if (strncmp(cmd_line, "remove ", 7) == 0) {
463     i = atoi(cmd_line + 7);
464     if (i==0 && cmd_line[7]!='0') {
465     printf("Weird device number. Use 'device list'.\n");
466     } else
467     memory_device_remove(m->memory, i);
468     } else if (strncmp(cmd_line, "state ", 6) == 0) {
469     i = atoi(cmd_line + 6);
470     if (i < 0 || i >= mem->n_mmapped_devices) {
471     printf("No devices with that id.\n");
472     return;
473     }
474    
475     if (mem->dev_f_state[i] == NULL) {
476     printf("No state function has been implemented yet "
477     "for that device type.\n");
478     return;
479     }
480    
481     for (j=0; ; j++) {
482     int type;
483     char *name;
484     void *data;
485     size_t len;
486     int res = mem->dev_f_state[i](c, mem,
487     mem->dev_extra[i], 0, j, &type, &name, &data, &len);
488     if (!res)
489     break;
490     printf("%2i:%30s = (", j, name);
491     switch (type) {
492     case DEVICE_STATE_TYPE_INT:
493     printf("int) %i", *((int *)data));
494     break;
495     default:
496     printf("unknown)");
497     }
498     printf("\n");
499     }
500     } else if (strcmp(cmd_line, "list") == 0) {
501     if (mem->n_mmapped_devices == 0)
502     printf("No memory-mapped devices in this machine.\n");
503    
504     for (i=0; i<mem->n_mmapped_devices; i++) {
505     printf("%2i: %25s @ 0x%011llx, len = 0x%llx",
506     i, mem->dev_name[i],
507     (long long)mem->dev_baseaddr[i],
508     (long long)mem->dev_length[i]);
509     if (mem->dev_flags[i]) {
510     printf(" (");
511     if (mem->dev_flags[i] & MEM_BINTRANS_OK)
512     printf("BINTRANS R");
513     if (mem->dev_flags[i] & MEM_BINTRANS_WRITE_OK)
514     printf("+W");
515     printf(")");
516     }
517     printf("\n");
518     }
519     } else
520     goto return_help;
521    
522     return;
523    
524     return_help:
525     printf("syntax: devices cmd [...]\n");
526     printf("Available cmds are:\n");
527     printf(" add name_and_params add a device to the current "
528     "machine\n");
529     printf(" all list all registered devices\n");
530     printf(" list list memory-mapped devices in the"
531     " current machine\n");
532     printf(" remove x remove device nr x from the "
533     "current machine\n");
534     printf(" state x show state of device nr x in"
535     " the current machine\n");
536     }
537    
538    
539     /*
540     * debugger_cmd_dump():
541     *
542     * Dump emulated memory in hex and ASCII.
543     *
544     * syntax: dump [addr [endaddr]]
545     */
546     static void debugger_cmd_dump(struct machine *m, char *cmd_line)
547     {
548     uint64_t addr, addr_start, addr_end;
549     struct cpu *c;
550     struct memory *mem;
551     char *p = NULL;
552     int x, r;
553    
554     if (cmd_line[0] != '\0') {
555     uint64_t tmp;
556     char *tmps = strdup(cmd_line);
557    
558     /* addr: */
559     p = strchr(tmps, ' ');
560     if (p != NULL)
561     *p = '\0';
562     r = debugger_parse_name(m, tmps, 0, &tmp);
563     free(tmps);
564    
565     if (r == NAME_PARSE_NOMATCH || r == NAME_PARSE_MULTIPLE) {
566     printf("Unparsable address: %s\n", cmd_line);
567     return;
568     } else {
569     last_dump_addr = tmp;
570     }
571    
572     p = strchr(cmd_line, ' ');
573     }
574    
575     addr_start = last_dump_addr;
576    
577     if (addr_start == MAGIC_UNTOUCHED) {
578     uint64_t tmp;
579     int match_register = 0;
580     cpu_register_match(m, "pc", 0, &tmp, &match_register);
581     if (match_register) {
582     addr_start = tmp;
583     } else {
584     printf("No starting address.\n");
585     return;
586     }
587     }
588    
589     addr_end = addr_start + 16 * 16;
590    
591     /* endaddr: */
592     if (p != NULL) {
593     while (*p == ' ' && *p)
594     p++;
595     r = debugger_parse_name(m, p, 0, &addr_end);
596     if (r == NAME_PARSE_NOMATCH || r == NAME_PARSE_MULTIPLE) {
597     printf("Unparsable address: %s\n", cmd_line);
598     return;
599     }
600     }
601    
602     if (m->cpus == NULL) {
603     printf("No cpus (?)\n");
604     return;
605     }
606     c = m->cpus[m->bootstrap_cpu];
607     if (c == NULL) {
608     printf("m->cpus[m->bootstrap_cpu] = NULL\n");
609     return;
610     }
611     mem = m->cpus[m->bootstrap_cpu]->mem;
612    
613     addr = addr_start & ~0xf;
614    
615     ctrl_c = 0;
616    
617     while (addr < addr_end) {
618     unsigned char buf[16];
619     memset(buf, 0, sizeof(buf));
620     r = c->memory_rw(c, mem, addr, &buf[0], sizeof(buf),
621     MEM_READ, CACHE_NONE | NO_EXCEPTIONS);
622    
623     printf("0x%016llx ", (long long)addr);
624    
625     if (r == MEMORY_ACCESS_FAILED)
626     printf("(memory access failed)\n");
627     else {
628     for (x=0; x<16; x++) {
629     if (addr + x >= addr_start &&
630     addr + x < addr_end)
631     printf("%02x%s", buf[x],
632     (x&3)==3? " " : "");
633     else
634     printf(" %s", (x&3)==3? " " : "");
635     }
636     printf(" ");
637     for (x=0; x<16; x++) {
638     if (addr + x >= addr_start &&
639     addr + x < addr_end)
640     printf("%c", (buf[x]>=' ' &&
641     buf[x]<127)? buf[x] : '.');
642     else
643     printf(" ");
644     }
645     printf("\n");
646     }
647    
648     if (ctrl_c)
649     return;
650    
651     addr += sizeof(buf);
652     }
653    
654     last_dump_addr = addr_end;
655    
656     strcpy(repeat_cmd, "dump");
657     }
658    
659    
660     /*
661     * debugger_cmd_emuls():
662     *
663     * Dump info about all current emuls.
664     */
665     static void debugger_cmd_emuls(struct machine *m, char *cmd_line)
666     {
667     int i, iadd = 4;
668    
669     if (*cmd_line) {
670     printf("syntax: emuls\n");
671     return;
672     }
673    
674     for (i=0; i<debugger_n_emuls; i++) {
675     struct emul *e = debugger_emuls[i];
676    
677     if (e == NULL)
678     continue;
679    
680     debug("emulation %i: \"%s\"\n", i,
681     e->name == NULL? "(no name)" : e->name);
682     debug_indentation(iadd);
683    
684     emul_dumpinfo(e);
685    
686     debug_indentation(-iadd);
687     }
688     }
689    
690    
691     /*
692     * debugger_cmd_focus():
693     *
694     * Changes focus to specific machine (in a specific emulation).
695     */
696     static void debugger_cmd_focus(struct machine *m, char *cmd_line)
697     {
698     int x = -1, y = -1;
699     char *p;
700    
701     if (!cmd_line[0]) {
702     printf("syntax: focus x[,y]\n");
703     printf("where x and y are integers as reported by the"
704     " 'emuls' command\n");
705     goto print_current_focus_and_return;
706     }
707    
708     x = atoi(cmd_line);
709     p = strchr(cmd_line, ',');
710     if (p == cmd_line) {
711     printf("No machine number specified?\n");
712     printf("syntax: focus x[,y]\n");
713     return;
714     }
715    
716     if (p != NULL)
717     y = atoi(p + 1);
718    
719     if (y != -1) {
720     /* Change emul: */
721     if (y < 0 || y >= debugger_n_emuls) {
722     printf("Invalid emul number: %i\n", y);
723     return;
724     }
725    
726     debugger_emul = debugger_emuls[y];
727    
728     /* This is just in case the machine change below fails... */
729     debugger_machine = debugger_emul->machines[0];
730     }
731    
732     /* Change machine: */
733     if (x < 0 || x >= debugger_emul->n_machines) {
734     printf("Invalid machine number: %i\n", x);
735     return;
736     }
737    
738     debugger_machine = debugger_emul->machines[x];
739    
740     print_current_focus_and_return:
741     printf("current emul: \"%s\"\n", debugger_emul->name == NULL?
742     "(no name)" : debugger_emul->name);
743     printf("current machine: \"%s\"\n", debugger_machine->name == NULL?
744     "(no name)" : debugger_machine->name);
745     }
746    
747    
748     /* This is defined below. */
749     static void debugger_cmd_help(struct machine *m, char *cmd_line);
750    
751    
752     /*
753     * debugger_cmd_itrace():
754     */
755     static void debugger_cmd_itrace(struct machine *m, char *cmd_line)
756     {
757     if (*cmd_line) {
758     printf("syntax: itrace\n");
759     return;
760     }
761    
762     old_instruction_trace = 1 - old_instruction_trace;
763     printf("instruction_trace = %s\n", old_instruction_trace? "ON":"OFF");
764     /* TODO: how to preserve quiet_mode? */
765     old_quiet_mode = 0;
766     printf("quiet_mode = %s\n", old_quiet_mode? "ON" : "OFF");
767     }
768    
769    
770     /*
771     * debugger_cmd_lookup():
772     */
773     static void debugger_cmd_lookup(struct machine *m, char *cmd_line)
774     {
775     uint64_t addr;
776     int res;
777     char *symbol;
778     uint64_t offset;
779    
780     if (cmd_line[0] == '\0') {
781     printf("syntax: lookup name|addr\n");
782     return;
783    
784     }
785    
786     /* Addresses never need to be given in decimal form anyway,
787     so assuming hex here will be ok. */
788     addr = strtoull(cmd_line, NULL, 16);
789    
790     if (addr == 0) {
791     uint64_t newaddr;
792     res = get_symbol_addr(&m->symbol_context,
793     cmd_line, &newaddr);
794     if (!res) {
795     printf("lookup for '%s' failed\n", cmd_line);
796     return;
797     }
798     printf("%s = 0x%016llx\n", cmd_line, (long long)newaddr);
799     return;
800     }
801    
802     symbol = get_symbol_name(&m->symbol_context, addr, &offset);
803    
804     if (symbol != NULL)
805     printf("0x%016llx = %s\n", (long long)addr, symbol);
806     else
807     printf("lookup for '%s' failed\n", cmd_line);
808     }
809    
810    
811     /*
812     * debugger_cmd_machine():
813     *
814     * Dump info about the currently focused machine.
815     */
816     static void debugger_cmd_machine(struct machine *m, char *cmd_line)
817     {
818     int iadd = 4;
819    
820     if (*cmd_line) {
821     printf("syntax: machine\n");
822     return;
823     }
824    
825     debug("machine \"%s\":\n", m->name);
826     debug_indentation(iadd);
827     machine_dumpinfo(m);
828     debug_indentation(-iadd);
829     }
830    
831    
832     /*
833     * debugger_cmd_opcodestats():
834     */
835     static void debugger_cmd_opcodestats(struct machine *m, char *cmd_line)
836     {
837     if (*cmd_line) {
838     printf("syntax: opcodestats\n");
839     return;
840     }
841    
842     if (!show_opcode_statistics) {
843     printf("You need to start the emulator "
844     "with -s, if you want to gather statistics.\n");
845     } else
846     cpu_show_full_statistics(m);
847     }
848    
849    
850     /*
851     * debugger_cmd_pause():
852     */
853     static void debugger_cmd_pause(struct machine *m, char *cmd_line)
854     {
855     int cpuid = -1;
856    
857     if (cmd_line[0] != '\0')
858     cpuid = atoi(cmd_line);
859     else {
860     printf("syntax: pause cpuid\n");
861     return;
862     }
863    
864     if (cpuid < 0 || cpuid >= m->ncpus) {
865     printf("cpu%i doesn't exist.\n", cpuid);
866     return;
867     }
868    
869     m->cpus[cpuid]->running ^= 1;
870    
871     printf("cpu%i (%s) in machine \"%s\" is now %s\n", cpuid,
872     m->cpus[cpuid]->name, m->name,
873     m->cpus[cpuid]->running? "RUNNING" : "STOPPED");
874     }
875    
876    
877     /*
878     * debugger_cmd_print():
879     */
880     static void debugger_cmd_print(struct machine *m, char *cmd_line)
881     {
882     int res;
883     uint64_t tmp;
884    
885     while (cmd_line[0] != '\0' && cmd_line[0] == ' ')
886     cmd_line ++;
887    
888     if (cmd_line[0] == '\0') {
889     printf("syntax: print expr\n");
890     return;
891     }
892    
893     res = debugger_parse_name(m, cmd_line, 0, &tmp);
894     switch (res) {
895     case NAME_PARSE_NOMATCH:
896     printf("No match.\n");
897     break;
898     case NAME_PARSE_MULTIPLE:
899     printf("Multiple matches. Try prefixing with %%, $, or @.\n");
900     break;
901     case NAME_PARSE_REGISTER:
902     case NAME_PARSE_SYMBOL:
903     printf("%s = 0x%016llx\n", cmd_line, (long long)tmp);
904     break;
905     case NAME_PARSE_NUMBER:
906     printf("0x%016llx\n", (long long)tmp);
907     break;
908     }
909     }
910    
911    
912     /*
913     * debugger_cmd_put():
914     */
915     static void debugger_cmd_put(struct machine *m, char *cmd_line)
916     {
917     static char put_type = ' '; /* Remembered across multiple calls. */
918     char copy[200];
919     int res, syntax_ok = 0;
920     char *p, *p2, *q = NULL;
921     uint64_t addr, data;
922     unsigned char a_byte;
923    
924     strncpy(copy, cmd_line, sizeof(copy));
925     copy[sizeof(copy)-1] = '\0';
926    
927     /* syntax: put [b|h|w|d|q] addr, data */
928    
929     p = strchr(copy, ',');
930     if (p != NULL) {
931     *p++ = '\0';
932     while (*p == ' ' && *p)
933     p++;
934     while (strlen(copy) >= 1 &&
935     copy[strlen(copy) - 1] == ' ')
936     copy[strlen(copy) - 1] = '\0';
937    
938     /* printf("L = '%s', R = '%s'\n", copy, p); */
939    
940     q = copy;
941     p2 = strchr(q, ' ');
942    
943     if (p2 != NULL) {
944     *p2 = '\0';
945     if (strlen(q) != 1) {
946     printf("Invalid type '%s'\n", q);
947     return;
948     }
949     put_type = *q;
950     q = p2 + 1;
951     }
952    
953     /* printf("type '%c', L '%s', R '%s'\n", put_type, q, p); */
954     syntax_ok = 1;
955     }
956    
957     if (!syntax_ok) {
958     printf("syntax: put [b|h|w|d|q] addr, data\n");
959     printf(" b byte (8 bits)\n");
960     printf(" h half-word (16 bits)\n");
961     printf(" w word (32 bits)\n");
962     printf(" d doubleword (64 bits)\n");
963     printf(" q quad-word (128 bits)\n");
964     return;
965     }
966    
967     if (put_type == ' ') {
968     printf("No type specified.\n");
969     return;
970     }
971    
972     /* here: q is the address, p is the data. */
973    
974     res = debugger_parse_name(m, q, 0, &addr);
975     switch (res) {
976     case NAME_PARSE_NOMATCH:
977     printf("Couldn't parse the address.\n");
978     return;
979     case NAME_PARSE_MULTIPLE:
980     printf("Multiple matches for the address."
981     " Try prefixing with %%, $, or @.\n");
982     return;
983     case NAME_PARSE_REGISTER:
984     case NAME_PARSE_SYMBOL:
985     case NAME_PARSE_NUMBER:
986     break;
987     default:
988     printf("INTERNAL ERROR in debugger.c.\n");
989     return;
990     }
991    
992     res = debugger_parse_name(m, p, 0, &data);
993     switch (res) {
994     case NAME_PARSE_NOMATCH:
995     printf("Couldn't parse the data.\n");
996     return;
997     case NAME_PARSE_MULTIPLE:
998     printf("Multiple matches for the data value."
999     " Try prefixing with %%, $, or @.\n");
1000     return;
1001     case NAME_PARSE_REGISTER:
1002     case NAME_PARSE_SYMBOL:
1003     case NAME_PARSE_NUMBER:
1004     break;
1005     default:
1006     printf("INTERNAL ERROR in debugger.c.\n");
1007     return;
1008     }
1009    
1010     /* TODO: haha, maybe this should be refactored */
1011    
1012     switch (put_type) {
1013     case 'b':
1014     a_byte = data;
1015     printf("0x%016llx: %02x", (long long)addr, a_byte);
1016     if (data > 255)
1017     printf(" (NOTE: truncating %0llx)", (long long)data);
1018     res = m->cpus[0]->memory_rw(m->cpus[0], m->cpus[0]->mem, addr,
1019     &a_byte, 1, MEM_WRITE, CACHE_NONE | NO_EXCEPTIONS);
1020     if (!res)
1021     printf(" FAILED!\n");
1022     printf("\n");
1023     return;
1024     case 'h':
1025     if ((data & 1) != 0)
1026     printf("WARNING: address isn't aligned\n");
1027     printf("0x%016llx: %04x", (long long)addr, (int)data);
1028     if (data > 0xffff)
1029     printf(" (NOTE: truncating %0llx)", (long long)data);
1030     res = store_16bit_word(m->cpus[0], addr, data);
1031     if (!res)
1032     printf(" FAILED!\n");
1033     printf("\n");
1034     return;
1035     case 'w':
1036     if ((data & 3) != 0)
1037     printf("WARNING: address isn't aligned\n");
1038     printf("0x%016llx: %08x", (long long)addr, (int)data);
1039     if (data > 0xffffffff && (data >> 32) != 0
1040     && (data >> 32) != 0xffffffff)
1041     printf(" (NOTE: truncating %0llx)", (long long)data);
1042     res = store_32bit_word(m->cpus[0], addr, data);
1043     if (!res)
1044     printf(" FAILED!\n");
1045     printf("\n");
1046     return;
1047     case 'd':
1048     if ((data & 7) != 0)
1049     printf("WARNING: address isn't aligned\n");
1050     printf("0x%016llx: %016llx", (long long)addr, (long long)data);
1051     res = store_64bit_word(m->cpus[0], addr, data);
1052     if (!res)
1053     printf(" FAILED!\n");
1054     printf("\n");
1055     return;
1056     case 'q':
1057     printf("quad-words: TODO\n");
1058     /* TODO */
1059     return;
1060     default:
1061     printf("Unimplemented type '%c'\n", put_type);
1062     return;
1063     }
1064     }
1065    
1066    
1067     /*
1068     * debugger_cmd_quiet():
1069     */
1070     static void debugger_cmd_quiet(struct machine *m, char *cmd_line)
1071     {
1072     int toggle = 1;
1073     int previous_mode = old_quiet_mode;
1074    
1075     if (cmd_line[0] != '\0') {
1076     while (cmd_line[0] != '\0' && cmd_line[0] == ' ')
1077     cmd_line ++;
1078     switch (cmd_line[0]) {
1079     case '0':
1080     toggle = 0;
1081     old_quiet_mode = 0;
1082     break;
1083     case '1':
1084     toggle = 0;
1085     old_quiet_mode = 1;
1086     break;
1087     case 'o':
1088     case 'O':
1089     toggle = 0;
1090     switch (cmd_line[1]) {
1091     case 'n':
1092     case 'N':
1093     old_quiet_mode = 1;
1094     break;
1095     default:
1096     old_quiet_mode = 0;
1097     }
1098     break;
1099     default:
1100     printf("syntax: quiet [on|off]\n");
1101     return;
1102     }
1103     }
1104    
1105     if (toggle)
1106     old_quiet_mode = 1 - old_quiet_mode;
1107    
1108     printf("quiet_mode = %s", old_quiet_mode? "ON" : "OFF");
1109     if (old_quiet_mode != previous_mode)
1110     printf(" (was: %s)", previous_mode? "ON" : "OFF");
1111     printf("\n");
1112     }
1113    
1114    
1115     /*
1116     * debugger_cmd_quit():
1117     */
1118     static void debugger_cmd_quit(struct machine *m, char *cmd_line)
1119     {
1120     int i, j, k;
1121     struct emul *e;
1122    
1123     if (*cmd_line) {
1124     printf("syntax: quit\n");
1125     return;
1126     }
1127    
1128     for (i=0; i<debugger_n_emuls; i++) {
1129     single_step = 0;
1130    
1131     e = debugger_emuls[i];
1132     force_debugger_at_exit = 0;
1133    
1134     for (j=0; j<e->n_machines; j++) {
1135     struct machine *m = e->machines[j];
1136    
1137     for (k=0; k<m->ncpus; k++)
1138     m->cpus[k]->running = 0;
1139    
1140     m->exit_without_entering_debugger = 1;
1141     }
1142     }
1143    
1144     exit_debugger = 1;
1145     }
1146    
1147    
1148     /*
1149     * debugger_cmd_reg():
1150     */
1151     static void debugger_cmd_reg(struct machine *m, char *cmd_line)
1152     {
1153     int i, cpuid = -1, coprocnr = -1;
1154     int gprs, coprocs;
1155     char *p;
1156    
1157     /* [cpuid][,c] */
1158     if (cmd_line[0] != '\0') {
1159     if (cmd_line[0] != ',') {
1160     cpuid = strtoull(cmd_line, NULL, 0);
1161     if (cpuid < 0 || cpuid >= m->ncpus) {
1162     printf("cpu%i doesn't exist.\n", cpuid);
1163     return;
1164     }
1165     }
1166     p = strchr(cmd_line, ',');
1167     if (p != NULL) {
1168     coprocnr = atoi(p + 1);
1169     if (coprocnr < 0 || coprocnr >= 4) {
1170     printf("Invalid coprocessor number.\n");
1171     return;
1172     }
1173     }
1174     }
1175    
1176     gprs = (coprocnr == -1)? 1 : 0;
1177     coprocs = (coprocnr == -1)? 0x0 : (1 << coprocnr);
1178    
1179     for (i=0; i<m->ncpus; i++)
1180     if (cpuid == -1 || i == cpuid)
1181     cpu_register_dump(m, m->cpus[i], gprs, coprocs);
1182     }
1183    
1184    
1185     /*
1186     * debugger_cmd_step():
1187     */
1188     static void debugger_cmd_step(struct machine *m, char *cmd_line)
1189     {
1190     int n = 1;
1191    
1192     if (cmd_line[0] != '\0') {
1193     n = strtoull(cmd_line, NULL, 0);
1194     if (n < 1) {
1195     printf("invalid nr of steps\n");
1196     return;
1197     }
1198     }
1199    
1200     n_steps_left_before_interaction = n - 1;
1201    
1202     /* Special hack, see debugger() for more info. */
1203     exit_debugger = -1;
1204    
1205     strcpy(repeat_cmd, "step");
1206     }
1207    
1208    
1209     /*
1210     * debugger_cmd_tlbdump():
1211     *
1212     * Dump each CPU's TLB contents.
1213     */
1214     static void debugger_cmd_tlbdump(struct machine *m, char *cmd_line)
1215     {
1216     int x = -1;
1217     int rawflag = 0;
1218    
1219     if (cmd_line[0] != '\0') {
1220     char *p;
1221     if (cmd_line[0] != ',') {
1222     x = strtoull(cmd_line, NULL, 0);
1223     if (x < 0 || x >= m->ncpus) {
1224     printf("cpu%i doesn't exist.\n", x);
1225     return;
1226     }
1227     }
1228     p = strchr(cmd_line, ',');
1229     if (p != NULL) {
1230     switch (p[1]) {
1231     case 'r':
1232     case 'R':
1233     rawflag = 1;
1234     break;
1235     default:
1236     printf("Unknown tlbdump flag.\n");
1237     printf("syntax: tlbdump [cpuid][,r]\n");
1238     return;
1239     }
1240     }
1241     }
1242    
1243     cpu_tlbdump(m, x, rawflag);
1244     }
1245    
1246    
1247     /*
1248     * debugger_cmd_trace():
1249     */
1250     static void debugger_cmd_trace(struct machine *m, char *cmd_line)
1251     {
1252     if (*cmd_line) {
1253     printf("syntax: trace\n");
1254     return;
1255     }
1256    
1257     old_show_trace_tree = 1 - old_show_trace_tree;
1258     printf("show_trace_tree = %s\n", old_show_trace_tree? "ON" : "OFF");
1259    
1260     if (m->bintrans_enable && old_show_trace_tree)
1261     printf("NOTE: the trace tree functionality doesn't "
1262     "work very well with bintrans!\n");
1263    
1264     /* TODO: how to preserve quiet_mode? */
1265     old_quiet_mode = 0;
1266     printf("quiet_mode = %s\n", old_quiet_mode? "ON" : "OFF");
1267     }
1268    
1269    
1270     /*
1271     * debugger_cmd_unassemble():
1272     *
1273     * Dump emulated memory as instructions.
1274     *
1275     * syntax: unassemble [addr [endaddr]]
1276     */
1277     static void debugger_cmd_unassemble(struct machine *m, char *cmd_line)
1278     {
1279     uint64_t addr, addr_start, addr_end;
1280     struct cpu *c;
1281     struct memory *mem;
1282     char *p = NULL;
1283     int r, lines_left = -1;
1284    
1285     if (cmd_line[0] != '\0') {
1286     uint64_t tmp;
1287     char *tmps = strdup(cmd_line);
1288    
1289     /* addr: */
1290     p = strchr(tmps, ' ');
1291     if (p != NULL)
1292     *p = '\0';
1293     r = debugger_parse_name(m, tmps, 0, &tmp);
1294     free(tmps);
1295    
1296     if (r == NAME_PARSE_NOMATCH || r == NAME_PARSE_MULTIPLE) {
1297     printf("Unparsable address: %s\n", cmd_line);
1298     return;
1299     } else {
1300     last_unasm_addr = tmp;
1301     }
1302    
1303     p = strchr(cmd_line, ' ');
1304     }
1305    
1306     addr_start = last_unasm_addr;
1307    
1308     if (addr_start == MAGIC_UNTOUCHED) {
1309     uint64_t tmp;
1310     int match_register = 0;
1311     cpu_register_match(m, "pc", 0, &tmp, &match_register);
1312     if (match_register) {
1313     addr_start = tmp;
1314     } else {
1315     printf("No starting address.\n");
1316     return;
1317     }
1318     }
1319    
1320     addr_end = addr_start + 1000;
1321    
1322     /* endaddr: */
1323     if (p != NULL) {
1324     while (*p == ' ' && *p)
1325     p++;
1326     r = debugger_parse_name(m, p, 0, &addr_end);
1327     if (r == NAME_PARSE_NOMATCH || r == NAME_PARSE_MULTIPLE) {
1328     printf("Unparsable address: %s\n", cmd_line);
1329     return;
1330     }
1331     } else
1332     lines_left = 20;
1333    
1334     if (m->cpus == NULL) {
1335     printf("No cpus (?)\n");
1336     return;
1337     }
1338     c = m->cpus[m->bootstrap_cpu];
1339     if (c == NULL) {
1340     printf("m->cpus[m->bootstrap_cpu] = NULL\n");
1341     return;
1342     }
1343     mem = m->cpus[m->bootstrap_cpu]->mem;
1344    
1345     addr = addr_start;
1346    
1347     if ((addr & 3) != 0)
1348     printf("WARNING! You entered an unaligned address.\n");
1349    
1350     ctrl_c = 0;
1351    
1352     while (addr < addr_end) {
1353     int i, len;
1354     unsigned char buf[25]; /* TODO: How long can an
1355     instruction be, on weird archs? */
1356     memset(buf, 0, sizeof(buf));
1357    
1358     for (i=0; i<sizeof(buf); i++)
1359     c->memory_rw(c, mem, addr+i, buf+i, 1, MEM_READ,
1360     CACHE_NONE | NO_EXCEPTIONS);
1361    
1362     len = cpu_disassemble_instr(m, c, buf, 0, addr, 0);
1363    
1364     if (ctrl_c)
1365     return;
1366     if (len == 0)
1367     break;
1368    
1369     addr += len;
1370    
1371     if (lines_left != -1) {
1372     lines_left --;
1373     if (lines_left == 0)
1374     break;
1375     }
1376     }
1377    
1378     last_unasm_addr = addr;
1379    
1380     strcpy(repeat_cmd, "unassemble");
1381     }
1382    
1383    
1384     /*
1385     * debugger_cmd_version():
1386     */
1387     static void debugger_cmd_version(struct machine *m, char *cmd_line)
1388     {
1389     if (*cmd_line) {
1390     printf("syntax: version\n");
1391     return;
1392     }
1393    
1394     #ifdef VERSION
1395     printf("%s, %s\n", VERSION, COMPILE_DATE);
1396     #else
1397     printf("(no version), %s\n", COMPILE_DATE);
1398     #endif
1399     }
1400    
1401    
1402     struct cmd {
1403     char *name;
1404     char *args;
1405     int tmp_flag;
1406     void (*f)(struct machine *, char *cmd_line);
1407     char *description;
1408     };
1409    
1410     static struct cmd cmds[] = {
1411     { "breakpoint", "...", 0, debugger_cmd_breakpoint,
1412     "manipulate breakpoints" },
1413    
1414     { "bintrans", "[on|off]", 0, debugger_cmd_bintrans,
1415     "toggle bintrans on or off" },
1416    
1417     /* NOTE: Try to keep 'c' down to only one command. Having 'continue'
1418     available as a one-letter command is very convenient. */
1419    
1420     { "continue", "", 0, debugger_cmd_continue,
1421     "continue execution" },
1422    
1423     { "device", "...", 0, debugger_cmd_device,
1424     "show info about (or manipulate) devices" },
1425    
1426     { "dump", "[addr [endaddr]]", 0, debugger_cmd_dump,
1427     "dump memory contents in hex and ASCII" },
1428    
1429     { "emuls", "", 0, debugger_cmd_emuls,
1430     "print a summary of all current emuls" },
1431    
1432     { "focus", "x[,y]", 0, debugger_cmd_focus,
1433     "changes focus to machine x (in emul y)" },
1434    
1435     { "help", "", 0, debugger_cmd_help,
1436     "print this help message" },
1437    
1438     { "itrace", "", 0, debugger_cmd_itrace,
1439     "toggle instruction_trace on or off" },
1440    
1441     { "lookup", "name|addr", 0, debugger_cmd_lookup,
1442     "lookup a symbol by name or address" },
1443    
1444     { "machine", "", 0, debugger_cmd_machine,
1445     "print a summary of the current machine" },
1446    
1447     { "opcodestats", "", 0, debugger_cmd_opcodestats,
1448     "show opcode statistics" },
1449    
1450     { "pause", "cpuid", 0, debugger_cmd_pause,
1451     "pause (or unpause) a CPU" },
1452    
1453     { "print", "expr", 0, debugger_cmd_print,
1454     "evaluate an expression without side-effects" },
1455    
1456     { "put", "[b|h|w|d|q] addr, data", 0, debugger_cmd_put,
1457     "modify emulated memory contents" },
1458    
1459     { "quiet", "[on|off]", 0, debugger_cmd_quiet,
1460     "toggle quiet_mode on or off" },
1461    
1462     { "quit", "", 0, debugger_cmd_quit,
1463     "quit the emulator" },
1464    
1465     { "reg", "[cpuid][,c]", 0, debugger_cmd_reg,
1466     "show GPRs (or coprocessor c's registers)" },
1467    
1468     /* NOTE: Try to keep 's' down to only one command. Having 'step'
1469     available as a one-letter command is very convenient. */
1470    
1471     { "step", "[n]", 0, debugger_cmd_step,
1472     "single-step one (or n) instruction(s)" },
1473    
1474     { "tlbdump", "[cpuid][,r]", 0, debugger_cmd_tlbdump,
1475     "dump TLB contents (add ',r' for raw data)" },
1476    
1477     { "trace", "", 0, debugger_cmd_trace,
1478     "toggle show_trace_tree on or off" },
1479    
1480     { "unassemble", "[addr [endaddr]]", 0, debugger_cmd_unassemble,
1481     "dump memory contents as instructions" },
1482    
1483     { "version", "", 0, debugger_cmd_version,
1484     "print version information" },
1485    
1486     { NULL, NULL, 0, NULL, NULL }
1487     };
1488    
1489    
1490     /*
1491     * debugger_cmd_help():
1492     *
1493     * Print a list of available commands.
1494     *
1495     * NOTE: This is placed after the cmds[] array, because it needs to
1496     * access it.
1497     */
1498     static void debugger_cmd_help(struct machine *m, char *cmd_line)
1499     {
1500     int i, j, max_name_len = 0;
1501    
1502     i = 0;
1503     while (cmds[i].name != NULL) {
1504     int a = strlen(cmds[i].name);
1505     if (cmds[i].args != NULL)
1506     a += 1 + strlen(cmds[i].args);
1507     if (a > max_name_len)
1508     max_name_len = a;
1509     i++;
1510     }
1511    
1512     printf("Available commands:\n");
1513    
1514     i = 0;
1515     while (cmds[i].name != NULL) {
1516     char buf[100];
1517     snprintf(buf, sizeof(buf), "%s", cmds[i].name);
1518     if (cmds[i].args != NULL)
1519     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
1520     " %s", cmds[i].args);
1521    
1522     printf(" ");
1523     for (j=0; j<max_name_len; j++)
1524     if (j < strlen(buf))
1525     printf("%c", buf[j]);
1526     else
1527     printf(" ");
1528    
1529     printf(" %s\n", cmds[i].description);
1530     i++;
1531     }
1532    
1533     printf("Generic assignments: x = expr\n");
1534     printf("where x must be a register, and expr can be a register, a "
1535     "numeric value, or\na symbol name (+ an optional numeric offset)."
1536     " In case there are multiple\nmatches (ie a symbol that has the "
1537     "same name as a register), you may add a\nprefix character as a "
1538     "hint: '%%' for registers, '@' for symbols, and\n'$' for numeric"
1539     " values. Use 0x for hexadecimal values.\n");
1540     }
1541    
1542    
1543     /****************************************************************************/
1544    
1545    
1546     /*
1547     * debugger_assignment():
1548     *
1549     * cmd contains something like "pc=0x80001000", or "r31=memcpy+0x40".
1550     */
1551     void debugger_assignment(struct machine *m, char *cmd)
1552     {
1553     char *left, *right;
1554     int res_left, res_right;
1555     uint64_t tmp;
1556    
1557     left = malloc(strlen(cmd) + 1);
1558     if (left == NULL) {
1559     fprintf(stderr, "out of memory in debugger_assignment()\n");
1560     exit(1);
1561     }
1562     strcpy(left, cmd);
1563     right = strchr(left, '=');
1564     if (right == NULL) {
1565     fprintf(stderr, "internal error in the debugger\n");
1566     exit(1);
1567     }
1568     *right = '\0';
1569    
1570     /* Remove trailing spaces in left: */
1571     while (strlen(left) >= 1 && left[strlen(left)-1] == ' ')
1572     left[strlen(left)-1] = '\0';
1573    
1574     /* Remove leading spaces in right: */
1575     right++;
1576     while (*right == ' ' && *right != '\0')
1577     right++;
1578    
1579     /* printf("left = '%s'\nright = '%s'\n", left, right); */
1580    
1581     res_right = debugger_parse_name(m, right, 0, &tmp);
1582     switch (res_right) {
1583     case NAME_PARSE_NOMATCH:
1584     printf("No match for the right-hand side of the assignment.\n");
1585     break;
1586     case NAME_PARSE_MULTIPLE:
1587     printf("Multiple matches for the right-hand side of the "
1588     "assignment.\n");
1589     break;
1590     default:
1591     res_left = debugger_parse_name(m, left, 1, &tmp);
1592     switch (res_left) {
1593     case NAME_PARSE_NOMATCH:
1594     printf("No match for the left-hand side of the "
1595     "assignment.\n");
1596     break;
1597     case NAME_PARSE_MULTIPLE:
1598     printf("Multiple matches for the left-hand side "
1599     "of the assignment.\n");
1600     break;
1601     default:
1602     debugger_cmd_print(m, left);
1603     }
1604     }
1605    
1606     free(left);
1607     }
1608    
1609    
1610     /*
1611     * debugger_readline():
1612     *
1613     * Read a line from the terminal.
1614     */
1615     static char *debugger_readline(void)
1616     {
1617     int ch, i, j, n, i_match, reallen, cmd_len, cursor_pos;
1618     int read_from_index = last_cmd_index;
1619     char *cmd = last_cmd[last_cmd_index];
1620    
1621     cmd_len = 0; cmd[0] = '\0';
1622     printf("GXemul> ");
1623     fflush(stdout);
1624    
1625     ch = '\0';
1626     cmd_len = 0;
1627     cursor_pos = 0;
1628    
1629     while (ch != '\n') {
1630     /*
1631     * TODO: This uses up 100% CPU, maybe that isn't too good.
1632     * The usleep() call might make it a tiny bit nicer on other
1633     * running processes, but it is still very ugly.
1634     */
1635     while ((ch = console_readchar(MAIN_CONSOLE)) < 0) {
1636     x11_check_event(debugger_emuls, debugger_n_emuls);
1637     usleep(2);
1638     }
1639    
1640     if ((ch == '\b' || ch == 127) && cursor_pos > 0) {
1641     /* Backspace. */
1642     cursor_pos --;
1643     cmd_len --;
1644     memmove(cmd + cursor_pos, cmd + cursor_pos + 1,
1645     cmd_len);
1646     cmd[cmd_len] = '\0';
1647     printf("\b");
1648     for (i=cursor_pos; i<cmd_len; i++)
1649     printf("%c", cmd[i]);
1650     printf(" \b");
1651     for (i=cursor_pos; i<cmd_len; i++)
1652     printf("\b");
1653     } else if (ch == 4 && cmd_len > 0 && cursor_pos < cmd_len) {
1654     /* CTRL-D: Delete. */
1655     cmd_len --;
1656     memmove(cmd + cursor_pos, cmd + cursor_pos + 1,
1657     cmd_len);
1658     cmd[cmd_len] = '\0';
1659     for (i=cursor_pos; i<cmd_len; i++)
1660     printf("%c", cmd[i]);
1661     printf(" \b");
1662     for (i=cursor_pos; i<cmd_len; i++)
1663     printf("\b");
1664     } else if (ch == 1) {
1665     /* CTRL-A: Start of line. */
1666     while (cursor_pos > 0) {
1667     cursor_pos --;
1668     printf("\b");
1669     }
1670     } else if (ch == 2) {
1671     /* CTRL-B: Backwards one character. */
1672     if (cursor_pos > 0) {
1673     printf("\b");
1674     cursor_pos --;
1675     }
1676     } else if (ch == 5) {
1677     /* CTRL-E: End of line. */
1678     while (cursor_pos < cmd_len) {
1679     printf("%c", cmd[cursor_pos]);
1680     cursor_pos ++;
1681     }
1682     } else if (ch == 6) {
1683     /* CTRL-F: Forward one character. */
1684     if (cursor_pos < cmd_len) {
1685     printf("%c",
1686     cmd[cursor_pos]);
1687     cursor_pos ++;
1688     }
1689     } else if (ch == 11) {
1690     /* CTRL-K: Kill to end of line. */
1691     for (i=0; i<MAX_CMD_LEN; i++)
1692     console_makeavail(MAIN_CONSOLE, 4); /* :-) */
1693     } else if (ch == 14 || ch == 16) {
1694     /* CTRL-P: Previous line in the command history,
1695     CTRL-N: next line */
1696     do {
1697     if (ch == 14 &&
1698     read_from_index == last_cmd_index)
1699     break;
1700     if (ch == 16)
1701     i = read_from_index - 1;
1702     else
1703     i = read_from_index + 1;
1704    
1705     if (i < 0)
1706     i = N_PREVIOUS_CMDS - 1;
1707     if (i >= N_PREVIOUS_CMDS)
1708     i = 0;
1709    
1710     /* Special case: pressing 'down'
1711     to reach last_cmd_index: */
1712     if (i == last_cmd_index) {
1713     read_from_index = i;
1714     for (i=cursor_pos; i<cmd_len;
1715     i++)
1716     printf(" ");
1717     for (i=cmd_len-1; i>=0; i--)
1718     printf("\b \b");
1719     cmd[0] = '\0';
1720     cmd_len = cursor_pos = 0;
1721     } else if (last_cmd[i][0] != '\0') {
1722     /* Copy from old line: */
1723     read_from_index = i;
1724     for (i=cursor_pos; i<cmd_len;
1725     i++)
1726     printf(" ");
1727     for (i=cmd_len-1; i>=0; i--)
1728     printf("\b \b");
1729     strcpy(cmd,
1730     last_cmd[read_from_index]);
1731     cmd_len = strlen(cmd);
1732     printf("%s", cmd);
1733     cursor_pos = cmd_len;
1734     }
1735     } while (0);
1736     } else if (ch >= ' ' && cmd_len < MAX_CMD_LEN) {
1737     /* Visible character: */
1738     memmove(cmd + cursor_pos + 1, cmd + cursor_pos,
1739     cmd_len - cursor_pos);
1740     cmd[cursor_pos] = ch;
1741     cmd_len ++;
1742     cursor_pos ++;
1743     cmd[cmd_len] = '\0';
1744     printf("%c", ch);
1745     for (i=cursor_pos; i<cmd_len; i++)
1746     printf("%c", cmd[i]);
1747     for (i=cursor_pos; i<cmd_len; i++)
1748     printf("\b");
1749     } else if (ch == '\r' || ch == '\n') {
1750     ch = '\n';
1751     printf("\n");
1752     } else if (ch == '\t') {
1753     /* Super-simple tab-completion: */
1754     i = 0;
1755     while (cmds[i].name != NULL)
1756     cmds[i++].tmp_flag = 0;
1757    
1758     /* Check for a (partial) command match: */
1759     n = i = i_match = 0;
1760     while (cmds[i].name != NULL) {
1761     if (strncasecmp(cmds[i].name, cmd,
1762     cmd_len) == 0) {
1763     cmds[i].tmp_flag = 1;
1764     i_match = i;
1765     n++;
1766     }
1767     i++;
1768     }
1769    
1770     switch (n) {
1771     case 0: /* Beep. */
1772     printf("\a");
1773     break;
1774     case 1: /* Add the rest of the command: */
1775     reallen = strlen(cmds[i_match].name);
1776     for (i=cmd_len; i<reallen; i++)
1777     console_makeavail(MAIN_CONSOLE,
1778     cmds[i_match].name[i]);
1779     /* ... and a space, if the command takes
1780     any arguments: */
1781     if (cmds[i_match].args != NULL &&
1782     cmds[i_match].args[0] != '\0')
1783     console_makeavail(MAIN_CONSOLE, ' ');
1784     break;
1785     default:
1786     /* Show all possible commands: */
1787     printf("\a\n"); /* Beep. :-) */
1788     i = 0; /* i = cmds index */
1789     j = 0; /* j = # of cmds printed */
1790     while (cmds[i].name != NULL) {
1791     if (cmds[i].tmp_flag) {
1792     int q;
1793     if (j == 0)
1794     printf(" ");
1795     printf("%s",
1796     cmds[i].name);
1797     j++;
1798     if (j != 6)
1799     for (q=0; q<13-strlen(
1800     cmds[i].name); q++)
1801     printf(" ");
1802     if (j == 6) {
1803     printf("\n");
1804     j = 0;
1805     }
1806     }
1807     i++;
1808     }
1809     if (j != 0)
1810     printf("\n");
1811     printf("GXemul> ");
1812     for (i=0; i<cmd_len; i++)
1813     printf("%c", cmd[i]);
1814     }
1815     } else if (ch == 27) {
1816     /* Escape codes: (cursor keys etc) */
1817     while ((ch = console_readchar(MAIN_CONSOLE)) < 0)
1818     usleep(1);
1819     if (ch == '[' || ch == 'O') {
1820     while ((ch = console_readchar(MAIN_CONSOLE))
1821     < 0)
1822     usleep(1);
1823     switch (ch) {
1824     case '2': /* 2~ = ins */
1825     case '5': /* 5~ = pgup */
1826     case '6': /* 6~ = pgdn */
1827     /* TODO: Ugly hack, but might work. */
1828     while ((ch = console_readchar(
1829     MAIN_CONSOLE)) < 0)
1830     usleep(1);
1831     /* Do nothing for these keys. */
1832     break;
1833     case '3': /* 3~ = delete */
1834     /* TODO: Ugly hack, but might work. */
1835     while ((ch = console_readchar(
1836     MAIN_CONSOLE)) < 0)
1837     usleep(1);
1838     console_makeavail(MAIN_CONSOLE, '\b');
1839     break;
1840     case 'A': /* Up. */
1841     /* Up cursor ==> CTRL-P */
1842     console_makeavail(MAIN_CONSOLE, 16);
1843     break;
1844     case 'B': /* Down. */
1845     /* Down cursor ==> CTRL-N */
1846     console_makeavail(MAIN_CONSOLE, 14);
1847     break;
1848     case 'C':
1849     /* Right cursor ==> CTRL-F */
1850     console_makeavail(MAIN_CONSOLE, 6);
1851     break;
1852     case 'D': /* Left */
1853     /* Left cursor ==> CTRL-B */
1854     console_makeavail(MAIN_CONSOLE, 2);
1855     break;
1856     case 'F':
1857     /* End ==> CTRL-E */
1858     console_makeavail(MAIN_CONSOLE, 5);
1859     break;
1860     case 'H':
1861     /* Home ==> CTRL-A */
1862     console_makeavail(MAIN_CONSOLE, 1);
1863     break;
1864     }
1865     }
1866     }
1867    
1868     fflush(stdout);
1869     }
1870    
1871     return cmd;
1872     }
1873    
1874    
1875     /*
1876     * debugger():
1877     *
1878     * This is a loop, which reads a command from the terminal, and executes it.
1879     */
1880     void debugger(void)
1881     {
1882     int i, n, i_match, matchlen, cmd_len;
1883     char *cmd;
1884    
1885     if (n_steps_left_before_interaction > 0) {
1886     n_steps_left_before_interaction --;
1887     return;
1888     }
1889    
1890     exit_debugger = 0;
1891    
1892     while (!exit_debugger) {
1893     /* Read a line from the terminal: */
1894     cmd = debugger_readline();
1895     cmd_len = strlen(cmd);
1896    
1897     /* Remove spaces: */
1898     while (cmd_len > 0 && cmd[0]==' ')
1899     memmove(cmd, cmd+1, cmd_len --);
1900     while (cmd_len > 0 && cmd[cmd_len-1] == ' ')
1901     cmd[(cmd_len--)-1] = '\0';
1902    
1903     /* No command? Then try reading another line. */
1904     if (cmd_len == 0) {
1905     /* Special case for repeated commands: */
1906     if (repeat_cmd[0] != '\0')
1907     strcpy(cmd, repeat_cmd);
1908     else
1909     continue;
1910     } else {
1911     last_cmd_index ++;
1912     if (last_cmd_index >= N_PREVIOUS_CMDS)
1913     last_cmd_index = 0;
1914    
1915     repeat_cmd[0] = '\0';
1916     }
1917    
1918     /*
1919     * Is there a '=' on the command line? Then try to do an
1920     * assignment. (Only if there is just one word, followed
1921     * by the '=' sign. This makes it possible to use commands
1922     * such as "device add name addr=xyz".)
1923     */
1924     if (strchr(cmd, '=') != NULL) {
1925     /* Count the nr of words: */
1926     int nw = 0, inword = 0;
1927     char *p = cmd;
1928     while (*p) {
1929     if (*p == '=')
1930     break;
1931     if (*p != ' ') {
1932     if (!inword)
1933     nw ++;
1934     inword = 1;
1935     } else
1936     inword = 0;
1937     p++;
1938     }
1939    
1940     if (nw == 1) {
1941     debugger_assignment(debugger_machine, cmd);
1942     continue;
1943     }
1944     }
1945    
1946     i = 0;
1947     while (cmds[i].name != NULL)
1948     cmds[i++].tmp_flag = 0;
1949    
1950     /* How many chars in cmd to match against: */
1951     matchlen = 0;
1952     while (isalpha((int)cmd[matchlen]))
1953     matchlen ++;
1954    
1955     /* Check for a command name match: */
1956     n = i = i_match = 0;
1957     while (cmds[i].name != NULL) {
1958     if (strncasecmp(cmds[i].name, cmd, matchlen) == 0) {
1959     cmds[i].tmp_flag = 1;
1960     i_match = i;
1961     n++;
1962     }
1963     i++;
1964     }
1965    
1966     /* No match? */
1967     if (n == 0) {
1968     printf("Unknown command '%s'. "
1969     "Type 'help' for help.\n", cmd);
1970     continue;
1971     }
1972    
1973     /* More than one match? */
1974     if (n > 1) {
1975     printf("Ambiguous command '%s': ", cmd);
1976     i = 0;
1977     while (cmds[i].name != NULL) {
1978     if (cmds[i].tmp_flag)
1979     printf(" %s", cmds[i].name);
1980     i++;
1981     }
1982     printf("\n");
1983     continue;
1984     }
1985    
1986     /* Exactly one match: */
1987     if (cmds[i_match].f != NULL) {
1988     char *p = cmd + matchlen;
1989     /* Remove leading whitespace from the args... */
1990     while (*p != '\0' && *p == ' ')
1991     p++;
1992    
1993     /* ... and run the command: */
1994     cmds[i_match].f(debugger_machine, p);
1995     } else
1996     printf("FATAL ERROR: internal error in debugger.c:"
1997     " no handler for this command?\n");
1998    
1999     /* Special hack for the "step" command: */
2000     if (exit_debugger == -1)
2001     return;
2002     }
2003    
2004     single_step = 0;
2005     debugger_machine->instruction_trace = old_instruction_trace;
2006     debugger_machine->show_trace_tree = old_show_trace_tree;
2007     quiet_mode = old_quiet_mode;
2008     }
2009    
2010    
2011     /*
2012     * debugger_reset():
2013     *
2014     * This function should be called before calling debugger(), when it is
2015     * absolutely necessary that debugger() is interactive. Otherwise, it might
2016     * return without doing anything, such as when single-stepping multiple
2017     * instructions at a time.
2018     */
2019     void debugger_reset(void)
2020     {
2021     n_steps_left_before_interaction = 0;
2022     }
2023    
2024    
2025     /*
2026     * debugger_init():
2027     *
2028     * Must be called before any other debugger function is used.
2029     */
2030     void debugger_init(struct emul **emuls, int n_emuls)
2031     {
2032     int i;
2033    
2034     debugger_n_emuls = n_emuls;
2035     debugger_emuls = emuls;
2036    
2037     if (n_emuls < 1) {
2038     fprintf(stderr, "\nERROR: No emuls (?)\n");
2039     exit(1);
2040     }
2041    
2042     debugger_emul = emuls[0];
2043     if (emuls[0]->n_machines < 1) {
2044     fprintf(stderr, "\nERROR: No machines in emuls[0], "
2045     "cannot handle this situation yet.\n\n");
2046     exit(1);
2047     }
2048    
2049     debugger_machine = emuls[0]->machines[0];
2050    
2051     for (i=0; i<N_PREVIOUS_CMDS; i++) {
2052     last_cmd[i] = malloc(MAX_CMD_LEN + 1);
2053     if (last_cmd[i] == NULL) {
2054     fprintf(stderr, "debugger_init(): out of memory\n");
2055     exit(1);
2056     }
2057     last_cmd[i][0] = '\0';
2058     }
2059    
2060     last_cmd_index = 0;
2061     repeat_cmd[0] = '\0';
2062     }
2063    

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