/[gxemul]/trunk/src/memory_rw.c
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Revision 24 - (show annotations)
Mon Oct 8 16:19:56 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 14980 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1256 2006/06/23 20:43:44 debug Exp $
20060219	Various minor updates. Removing the old MIPS16 skeleton code,
		because it will need to be rewritten for dyntrans anyway.
20060220-22	Removing the non-working dyntrans backend support.
		Continuing on the 64-bit dyntrans virtual memory generalization.
20060223	More work on the 64-bit vm generalization.
20060225	Beginning on MIPS dyntrans load/store instructions.
		Minor PPC updates (64-bit load/store, etc).
		Fixes for the variable-instruction-length framework, some
		minor AVR updates (a simple Hello World program works!).
		Beginning on a skeleton for automatically generating documen-
		tation (for devices etc.).
20060226	PPC updates (adding some more 64-bit instructions, etc).
		AVR updates (more instructions).
		FINALLY found and fixed the zs bug, making NetBSD/macppc
		accept the serial console.
20060301	Adding more AVR instructions.
20060304	Continuing on AVR-related stuff. Beginning on a framework for
		cycle-accurate device emulation. Adding an experimental "PAL
		TV" device (just a dummy so far).
20060305	Adding more AVR instructions.
		Adding a dummy epcom serial controller (for TS7200 emulation).
20060310	Removing the emul() command from configuration files, so only
		net() and machine() are supported.
		Minor progress on the MIPS dyntrans rewrite.
20060311	Continuing on the MIPS dyntrans rewrite (adding more
		instructions, etc).
20060315	Adding more instructions (sllv, srav, srlv, bgtz[l], blez[l],
		beql, bnel, slti[u], various loads and stores).
20060316	Removing the ALWAYS_SIGNEXTEND_32 option, since it was rarely
		used.
		Adding more MIPS dyntrans instructions, and fixing bugs.
20060318	Implementing fast loads/stores for MIPS dyntrans (big/little
		endian, 32-bit and 64-bit modes).
20060320	Making MIPS dyntrans the default configure option; use
		"--enable-oldmips" to use the old bintrans system.
		Adding MIPS dyntrans dmult[u]; minor updates.
20060322	Continuing... adding some more instructions.
		Adding a simple skeleton for demangling C++ "_ZN" symbols.
20060323	Moving src/debugger.c into a new directory (src/debugger/).
20060324	Fixing the hack used to load PPC ELFs (useful for relocated
		Linux/ppc kernels), and adding a dummy G3 machine mode.
20060325-26	Beginning to experiment with GDB remote serial protocol
		connections; adding a -G command line option for selecting
		which TCP port to listen to.
20060330	Beginning a major cleanup to replace things like "0x%016llx"
		with more correct "0x%016"PRIx64, etc.
		Continuing on the GDB remote serial protocol support.
20060331	More cleanup, and some minor GDB remote progress.
20060402	Adding a hack to the configure script, to allow compilation
		on systems that lack PRIx64 etc.
20060406	Removing the temporary FreeBSD/arm hack in dev_ns16550.c and
		replacing it with a better fix from Olivier Houchard.
20060407	A remote debugger (gdb or ddd) can now start and stop the
		emulator using the GDB remote serial protocol, and registers
		and memory can be read. MIPS only for now.
20060408	More GDB progress: single-stepping also works, and also adding
		support for ARM, PowerPC, and Alpha targets.
		Continuing on the delay-slot-across-page-boundary issue.
20060412	Minor update: beginning to add support for the SPARC target
		to the remote GDB functionality.
20060414	Various MIPS updates: adding more instructions for dyntrans
		(eret, add), and making some exceptions work. Fixing a bug
		in dmult[u].
		Implementing the first SPARC instructions (sethi, or).
20060415	Adding "magic trap" instructions so that PROM calls can be
		software emulated in MIPS dyntrans.
		Adding more MIPS dyntrans instructions (ddiv, dadd) and
		fixing another bug in dmult.
20060416	More MIPS dyntrans progress: adding [d]addi, movn, movz, dsllv,
		rfi, an ugly hack for supporting R2000/R3000 style faked caches,
		preliminary interrupt support, and various other updates and
		bugfixes.
20060417	Adding more SPARC instructions (add, sub, sll[x], sra[x],
		srl[x]), and useful SPARC header definitions.
		Adding the first (trivial) x86/AMD64 dyntrans instructions (nop,
		cli/sti, stc/clc, std/cld, simple mov, inc ax). Various other
		x86 updates related to variable instruction length stuff.
		Adding unaligned loads/stores to the MIPS dyntrans mode (but
		still using the pre-dyntrans (slow) imlementation).
20060419	Fixing a MIPS dyntrans exception-in-delay-slot bug.
		Removing the old "show opcode statistics" functionality, since
		it wasn't really useful and isn't implemented for dyntrans.
		Single-stepping (or running with instruction trace) now looks
		ok with dyntrans with delay-slot architectures.
20060420	Minor hacks (removing the -B command line option when compiled
		for non-bintrans, and some other very minor updates).
		Adding (slow) MIPS dyntrans load-linked/store-conditional.
20060422	Applying fixes for bugs discovered by Nils Weller's nwcc
		(static DEC memmap => now per machine, and adding an extern
		keyword in cpu_arm_instr.c).
		Finally found one of the MIPS dyntrans bugs that I've been
		looking for (copy/paste spelling error BIG vs LITTLE endian in
		cpu_mips_instr_loadstore.c for 16-bit fast stores).
		FINALLY found the major MIPS dyntrans bug: slti vs sltiu
		signed/unsigned code in cpu_mips_instr.c. :-)
		Adding more MIPS dyntrans instructions (lwc1, swc1, bgezal[l],
		ctc1, tlt[u], tge[u], tne, beginning on rdhwr).
		NetBSD/hpcmips can now reach userland when using dyntrans :-)
		Adding some more x86 dyntrans instructions.
		Finally removed the old Alpha-specific virtual memory code,
		and replaced it with the generic 64-bit version.
		Beginning to add disassembly support for SPECIAL3 MIPS opcodes.
20060423	Continuing on the delay-slot-across-page-boundary issue;
		adding an end_of_page2 ic slot (like I had planned before, but
		had removed for some reason).
		Adding a quick-and-dirty fallback to legacy coprocessor 1
		code (i.e. skipping dyntrans implementation for now).
		NetBSD/hpcmips and NetBSD/pmax (when running on an emulated
		R4400) can now be installed and run. :-)  (Many bugs left
		to fix, though.)
		Adding more MIPS dyntrans instructions: madd[u], msub[u].
		Cleaning up the SPECIAL2 vs R5900/TX79/C790 "MMI" opcode
		maps somewhat (disassembly and dyntrans instruction decoding).
20060424	Adding an isa_revision field to mips_cpu_types.h, and making
		sure that SPECIAL3 opcodes cause Reserved Instruction
		exceptions on MIPS32/64 revisions lower than 2.
		Adding the SPARC 'ba', 'call', 'jmpl/retl', 'and', and 'xor'
		instructions.
20060425	Removing the -m command line option ("run at most x 
		instructions") and -T ("single_step_on_bad_addr"), because
		they never worked correctly with dyntrans anyway.
		Freshening up the man page.
20060428	Adding more MIPS dyntrans instructions: bltzal[l], idle.
		Enabling MIPS dyntrans compare interrupts.
20060429	FINALLY found the weird dyntrans bug, causing NetBSD etc. to
		behave strangely: some floating point code (conditional
		coprocessor branches) could not be reused from the old
		non-dyntrans code. The "quick-and-dirty fallback" only appeared
		to work. Fixing by implementing bc1* for MIPS dyntrans.
		More MIPS instructions: [d]sub, sdc1, ldc1, dmtc1, dmfc1, cfc0.
		Freshening up MIPS floating point disassembly appearance.
20060430	Continuing on C790/R5900/TX79 disassembly; implementing 128-bit
		"por" and "pextlw".
20060504	Disabling -u (userland emulation) unless compiled as unstable
		development version.
		Beginning on freshening up the testmachine include files,
		to make it easier to reuse those files (placing them in
		src/include/testmachine/), and beginning on a set of "demos"
		or "tutorials" for the testmachine functionality.
		Minor updates to the MIPS GDB remote protocol stub.
		Refreshing doc/experiments.html and gdb_remote.html.
		Enabling Alpha emulation in the stable release configuration,
		even though no guest OSes for Alpha can run yet.
20060505	Adding a generic 'settings' object, which will contain
		references to settable variables (which will later be possible
		to access using the debugger).
20060506	Updating dev_disk and corresponding demo/documentation (and
		switching from SCSI to IDE disk types, so it actually works
		with current test machines :-).
20060510	Adding a -D_LARGEFILE_SOURCE hack for 64-bit Linux hosts,
		so that fseeko() doesn't give a warning.
		Updating the section about how dyntrans works (the "runnable
		IR") in doc/intro.html.
		Instruction updates (some x64=1 checks, some more R5900
		dyntrans stuff: better mul/mult separation from MIPS32/64,
		adding ei and di).
		Updating MIPS cpuregs.h to a newer one (from NetBSD).
		Adding more MIPS dyntrans instructions: deret, ehb.
20060514	Adding disassembly and beginning implementation of SPARC wr
		and wrpr instructions.
20060515	Adding a SUN SPARC machine mode, with dummy SS20 and Ultra1
		machines. Adding the 32-bit "rd psr" instruction.
20060517	Disassembly support for the general SPARC rd instruction.
		Partial implementation of the cmp (subcc) instruction.
		Some other minor updates (making sure that R5900 processors
		start up with the EIE bit enabled, otherwise Linux/playstation2
		receives no interrupts).
20060519	Minor MIPS updates/cleanups.
20060521	Moving the MeshCube machine into evbmips; this seems to work
		reasonably well with a snapshot of a NetBSD MeshCube kernel.
		Cleanup/fix of MIPS config0 register initialization.
20060529	Minor MIPS fixes, including a sign-extension fix to the
		unaligned load/store code, which makes NetBSD/pmax on R3000
		work better with dyntrans. (Ultrix and Linux/DECstation still
		don't work, though.)
20060530	Minor updates to the Alpha machine mode: adding an AlphaBook
		mode, an LCA bus (forwarding accesses to an ISA bus), etc.
20060531	Applying a bugfix for the MIPS dyntrans sc[d] instruction from
		Ondrej Palkovsky. (Many thanks.)
20060601	Minifix to allow ARM immediate msr instruction to not give
		an error for some valid values.
		More Alpha updates.
20060602	Some minor Alpha updates.
20060603	Adding the Alpha cmpbge instruction. NetBSD/alpha prints its
		first boot messages :-) on an emulated Alphabook 1.
20060612	Minor updates; adding a dev_ether.h include file for the
		testmachine ether device. Continuing the hunt for the dyntrans
		bug which makes Linux and Ultrix on DECstation behave
		strangely... FINALLY found it! It seems to be related to
		invalidation of the translation cache, on tlbw{r,i}. There
		also seems to be some remaining interrupt-related problems.
20060614	Correcting the implementation of ldc1/sdc1 for MIPS dyntrans
		(so that it uses 16 32-bit registers if the FR bit in the
		status register is not set).
20060616	REMOVING BINTRANS COMPLETELY!
		Removing the old MIPS interpretation mode.
		Removing the MFHILO_DELAY and instruction delay stuff, because
		they wouldn't work with dyntrans anyway.
20060617	Some documentation updates (adding "NetBSD-archive" to some
		URLs, and new Debian/DECstation installation screenshots).
		Removing the "tracenull" and "enable-caches" configure options.
		Improving MIPS dyntrans performance somewhat (only invalidate
		translations if necessary, on writes to the entryhi register,
		instead of doing it for all cop0 writes).
20060618	More cleanup after the removal of the old MIPS emulation.
		Trying to fix the MIPS dyntrans performance bugs/bottlenecks;
		only semi-successful so far (for R3000).
20060620	Minor update to allow clean compilation again on Tru64/Alpha.
20060622	MIPS cleanup and fixes (removing the pc_last stuff, which
		doesn't make sense with dyntrans anyway, and fixing a cross-
		page-delay-slot-with-exception case in end_of_page).
		Removing the old max_random_cycles_per_chunk stuff, and the
		concept of cycles vs instructions for MIPS emulation.
		FINALLY found and fixed the bug which caused NetBSD/pmax
		clocks to behave strangely (it was a load to the zero register,
		which was treated as a NOP; now it is treated as a load to a
		dummy scratch register).
20060623	Increasing the dyntrans chunk size back to
		N_SAFE_DYNTRANS_LIMIT, instead of N_SAFE_DYNTRANS_LIMIT/2.
		Preparing for a quick release, even though there are known
		bugs, and performance for non-R3000 MIPS emulation is very
		poor. :-/
		Reverting to half the dyntrans chunk size again, because
		NetBSD/cats seemed less stable with full size chunks. :(
		NetBSD/sgimips 3.0 can now run :-)  (With release 0.3.8, only
		NetBSD/sgimips 2.1 worked, not 3.0.)

==============  RELEASE 0.4.0  ==============
1 /*
2 * Copyright (C) 2003-2006 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: memory_rw.c,v 1.87 2006/06/22 11:43:03 debug Exp $
29 *
30 * Generic memory_rw(), with special hacks for specific CPU families.
31 *
32 * Example for inclusion from memory_mips.c:
33 *
34 * MEMORY_RW should be mips_memory_rw
35 * MEM_MIPS should be defined
36 */
37
38
39 /*
40 * memory_rw():
41 *
42 * Read or write data from/to memory.
43 *
44 * cpu the cpu doing the read/write
45 * mem the memory object to use
46 * vaddr the virtual address
47 * data a pointer to the data to be written to memory, or
48 * a placeholder for data when reading from memory
49 * len the length of the 'data' buffer
50 * writeflag set to MEM_READ or MEM_WRITE
51 * misc_flags CACHE_{NONE,DATA,INSTRUCTION} | other flags
52 *
53 * If the address indicates access to a memory mapped device, that device'
54 * read/write access function is called.
55 *
56 * This function should not be called with cpu == NULL.
57 *
58 * Returns one of the following:
59 * MEMORY_ACCESS_FAILED
60 * MEMORY_ACCESS_OK
61 *
62 * (MEMORY_ACCESS_FAILED is 0.)
63 */
64 int MEMORY_RW(struct cpu *cpu, struct memory *mem, uint64_t vaddr,
65 unsigned char *data, size_t len, int writeflag, int misc_flags)
66 {
67 #ifdef MEM_ALPHA
68 const int offset_mask = 0x1fff;
69 #else
70 const int offset_mask = 0xfff;
71 #endif
72
73 #ifndef MEM_USERLAND
74 int ok = 1;
75 #endif
76 uint64_t paddr;
77 int cache, no_exceptions, offset;
78 unsigned char *memblock;
79 int dyntrans_device_danger = 0;
80
81 no_exceptions = misc_flags & NO_EXCEPTIONS;
82 cache = misc_flags & CACHE_FLAGS_MASK;
83
84 #ifdef MEM_X86
85 /* Real-mode wrap-around: */
86 if (REAL_MODE && !(misc_flags & PHYSICAL)) {
87 if ((vaddr & 0xffff) + len > 0x10000) {
88 /* Do one byte at a time: */
89 int res = 0;
90 size_t i;
91 for (i=0; i<len; i++)
92 res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1,
93 writeflag, misc_flags);
94 return res;
95 }
96 }
97
98 /* Crossing a page boundary? Then do one byte at a time: */
99 if ((vaddr & 0xfff) + len > 0x1000 && !(misc_flags & PHYSICAL)
100 && cpu->cd.x86.cr[0] & X86_CR0_PG) {
101 /* For WRITES: Read ALL BYTES FIRST and write them back!!!
102 Then do a write of all the new bytes. This is to make sure
103 than both pages around the boundary are writable so we don't
104 do a partial write. */
105 int res = 0;
106 size_t i;
107 if (writeflag == MEM_WRITE) {
108 unsigned char tmp;
109 for (i=0; i<len; i++) {
110 res = MEMORY_RW(cpu, mem, vaddr+i, &tmp, 1,
111 MEM_READ, misc_flags);
112 if (!res)
113 return 0;
114 res = MEMORY_RW(cpu, mem, vaddr+i, &tmp, 1,
115 MEM_WRITE, misc_flags);
116 if (!res)
117 return 0;
118 }
119 for (i=0; i<len; i++) {
120 res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1,
121 MEM_WRITE, misc_flags);
122 if (!res)
123 return 0;
124 }
125 } else {
126 for (i=0; i<len; i++) {
127 /* Do one byte at a time: */
128 res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1,
129 writeflag, misc_flags);
130 if (!res) {
131 if (cache == CACHE_INSTRUCTION) {
132 fatal("FAILED instruction "
133 "fetch across page boundar"
134 "y: todo. vaddr=0x%08x\n",
135 (int)vaddr);
136 cpu->running = 0;
137 }
138 return 0;
139 }
140 }
141 }
142 return res;
143 }
144 #endif /* X86 */
145
146
147 #ifdef MEM_USERLAND
148 #ifdef MEM_ALPHA
149 paddr = vaddr;
150 #else
151 paddr = vaddr & 0x7fffffff;
152 #endif
153 #else /* !MEM_USERLAND */
154 if (misc_flags & PHYSICAL || cpu->translate_address == NULL) {
155 paddr = vaddr;
156 } else {
157 ok = cpu->translate_address(cpu, vaddr, &paddr,
158 (writeflag? FLAG_WRITEFLAG : 0) +
159 (no_exceptions? FLAG_NOEXCEPTIONS : 0)
160 #ifdef MEM_X86
161 + (misc_flags & NO_SEGMENTATION)
162 #endif
163 #ifdef MEM_ARM
164 + (misc_flags & MEMORY_USER_ACCESS)
165 #endif
166 + (cache==CACHE_INSTRUCTION? FLAG_INSTR : 0));
167 /* If the translation caused an exception, or was invalid in
168 some way, we simply return without doing the memory
169 access: */
170 if (!ok)
171 return MEMORY_ACCESS_FAILED;
172 }
173
174
175 #ifdef MEM_X86
176 /* DOS debugging :-) */
177 if (!quiet_mode && !(misc_flags & PHYSICAL)) {
178 if (paddr >= 0x400 && paddr <= 0x4ff)
179 debug("{ PC BIOS DATA AREA: %s 0x%x }\n", writeflag ==
180 MEM_WRITE? "writing to" : "reading from",
181 (int)paddr);
182 #if 0
183 if (paddr >= 0xf0000 && paddr <= 0xfffff)
184 debug("{ BIOS ACCESS: %s 0x%x }\n",
185 writeflag == MEM_WRITE? "writing to" :
186 "reading from", (int)paddr);
187 #endif
188 }
189 #endif
190 #endif /* !MEM_USERLAND */
191
192
193 #ifndef MEM_USERLAND
194 /*
195 * Memory mapped device?
196 *
197 * TODO: if paddr < base, but len enough, then the device should
198 * still be written to!
199 */
200 if (paddr >= mem->mmap_dev_minaddr && paddr < mem->mmap_dev_maxaddr) {
201 uint64_t orig_paddr = paddr;
202 int i, start, end, res;
203
204 /*
205 * Really really slow, but unfortunately necessary. This is
206 * to avoid the folowing scenario:
207 *
208 * a) offsets 0x000..0x123 are normal memory
209 * b) offsets 0x124..0x777 are a device
210 *
211 * 1) a read is done from offset 0x100. the page is
212 * added to the dyntrans system as a "RAM" page
213 * 2) a dyntranslated read is done from offset 0x200,
214 * which should access the device, but since the
215 * entire page is added, it will access non-existant
216 * RAM instead, without warning.
217 *
218 * Setting dyntrans_device_danger = 1 on accesses which are
219 * on _any_ offset on pages that are device mapped avoids
220 * this problem, but it is probably not very fast.
221 *
222 * TODO: Convert this into a quick (multi-level, 64-bit)
223 * address space lookup, to find dangerous pages.
224 */
225 #if 1
226 for (i=0; i<mem->n_mmapped_devices; i++)
227 if (paddr >= (mem->dev_baseaddr[i] & ~offset_mask) &&
228 paddr <= ((mem->dev_endaddr[i]-1) | offset_mask)) {
229 dyntrans_device_danger = 1;
230 break;
231 }
232 #endif
233
234 start = 0; end = mem->n_mmapped_devices - 1;
235 i = mem->last_accessed_device;
236
237 /* Scan through all devices: */
238 do {
239 if (paddr >= mem->dev_baseaddr[i] &&
240 paddr < mem->dev_endaddr[i]) {
241 /* Found a device, let's access it: */
242 mem->last_accessed_device = i;
243
244 paddr -= mem->dev_baseaddr[i];
245 if (paddr + len > mem->dev_length[i])
246 len = mem->dev_length[i] - paddr;
247
248 if (cpu->update_translation_table != NULL &&
249 !(ok & MEMORY_NOT_FULL_PAGE) &&
250 mem->dev_flags[i] & DM_DYNTRANS_OK) {
251 int wf = writeflag == MEM_WRITE? 1 : 0;
252 unsigned char *host_addr;
253
254 if (!(mem->dev_flags[i] &
255 DM_DYNTRANS_WRITE_OK))
256 wf = 0;
257
258 if (writeflag && wf) {
259 if (paddr < mem->
260 dev_dyntrans_write_low[i])
261 mem->
262 dev_dyntrans_write_low
263 [i] = paddr &
264 ~offset_mask;
265 if (paddr >= mem->
266 dev_dyntrans_write_high[i])
267 mem->
268 dev_dyntrans_write_high
269 [i] = paddr |
270 offset_mask;
271 }
272
273 if (mem->dev_flags[i] &
274 DM_EMULATED_RAM) {
275 /* MEM_WRITE to force the page
276 to be allocated, if it
277 wasn't already */
278 uint64_t *pp = (uint64_t *)
279 mem->dev_dyntrans_data[i];
280 uint64_t p = orig_paddr - *pp;
281 host_addr =
282 memory_paddr_to_hostaddr(
283 mem, p, MEM_WRITE)
284 + (p & ~offset_mask
285 & ((1 <<
286 BITS_PER_MEMBLOCK) - 1));
287 } else {
288 host_addr =
289 mem->dev_dyntrans_data[i] +
290 (paddr & ~offset_mask);
291 }
292 cpu->update_translation_table(cpu,
293 vaddr & ~offset_mask, host_addr,
294 wf, orig_paddr & ~offset_mask);
295 }
296
297 res = 0;
298 if (!no_exceptions || (mem->dev_flags[i] &
299 DM_READS_HAVE_NO_SIDE_EFFECTS))
300 res = mem->dev_f[i](cpu, mem, paddr,
301 data, len, writeflag,
302 mem->dev_extra[i]);
303
304 if (res == 0)
305 res = -1;
306
307 #ifndef MEM_X86
308 /*
309 * If accessing the memory mapped device
310 * failed, then return with a DBE exception.
311 */
312 if (res <= 0 && !no_exceptions) {
313 debug("%s device '%s' addr %08lx "
314 "failed\n", writeflag?
315 "writing to" : "reading from",
316 mem->dev_name[i], (long)paddr);
317 #ifdef MEM_MIPS
318 mips_cpu_exception(cpu, EXCEPTION_DBE,
319 0, vaddr, 0, 0, 0, 0);
320 #endif
321 return MEMORY_ACCESS_FAILED;
322 }
323 #endif
324 goto do_return_ok;
325 }
326
327 if (paddr < mem->dev_baseaddr[i])
328 end = i - 1;
329 if (paddr >= mem->dev_endaddr[i])
330 start = i + 1;
331 i = (start + end) >> 1;
332 } while (start <= end);
333 }
334
335
336 #ifdef MEM_MIPS
337 /*
338 * Data and instruction cache emulation:
339 */
340
341 switch (cpu->cd.mips.cpu_type.mmu_model) {
342 case MMU3K:
343 /* if not uncached addess (TODO: generalize this) */
344 if (!(misc_flags & PHYSICAL) && cache != CACHE_NONE &&
345 !((vaddr & 0xffffffffULL) >= 0xa0000000ULL &&
346 (vaddr & 0xffffffffULL) <= 0xbfffffffULL)) {
347 if (memory_cache_R3000(cpu, cache, paddr,
348 writeflag, len, data))
349 goto do_return_ok;
350 }
351 break;
352 default:
353 /* R4000 etc */
354 /* TODO */
355 ;
356 }
357 #endif /* MEM_MIPS */
358
359
360 /* Outside of physical RAM? */
361 if (paddr >= mem->physical_max) {
362 #ifdef MEM_MIPS
363 if ((paddr & 0xffffc00000ULL) == 0x1fc00000) {
364 /* Ok, this is PROM stuff */
365 } else if ((paddr & 0xfffff00000ULL) == 0x1ff00000) {
366 /* Sprite reads from this area of memory... */
367 /* TODO: is this still correct? */
368 if (writeflag == MEM_READ)
369 memset(data, 0, len);
370 goto do_return_ok;
371 } else
372 #endif /* MIPS */
373 {
374 if (paddr >= mem->physical_max) {
375 uint64_t offset, old_pc = cpu->pc;
376 char *symbol;
377
378 /* This allows for example OS kernels to probe
379 memory a few KBs past the end of memory,
380 without giving too many warnings. */
381 if (!quiet_mode && !no_exceptions && paddr >=
382 mem->physical_max + 0x40000) {
383 fatal("[ memory_rw(): writeflag=%i ",
384 writeflag);
385 if (writeflag) {
386 unsigned int i;
387 debug("data={", writeflag);
388 if (len > 16) {
389 int start2 = len-16;
390 for (i=0; i<16; i++)
391 debug("%s%02x",
392 i?",":"",
393 data[i]);
394 debug(" .. ");
395 if (start2 < 16)
396 start2 = 16;
397 for (i=start2; i<len;
398 i++)
399 debug("%s%02x",
400 i?",":"",
401 data[i]);
402 } else
403 for (i=0; i<len; i++)
404 debug("%s%02x",
405 i?",":"",
406 data[i]);
407 debug("}");
408 }
409
410 fatal(" paddr=0x%llx >= physical_max"
411 "; pc=", (long long)paddr);
412 if (cpu->is_32bit)
413 fatal("0x%08x",(int)old_pc);
414 else
415 fatal("0x%016llx",
416 (long long)old_pc);
417 symbol = get_symbol_name(
418 &cpu->machine->symbol_context,
419 old_pc, &offset);
420 fatal(" <%s> ]\n",
421 symbol? symbol : " no symbol ");
422 }
423 }
424
425 if (writeflag == MEM_READ) {
426 #ifdef MEM_X86
427 /* Reading non-existant memory on x86: */
428 memset(data, 0xff, len);
429 #else
430 /* Return all zeroes? (Or 0xff? TODO) */
431 memset(data, 0, len);
432 #endif
433
434 #ifdef MEM_MIPS
435 /*
436 * For real data/instruction accesses, cause
437 * an exceptions on an illegal read:
438 */
439 if (cache != CACHE_NONE && cpu->machine->
440 dbe_on_nonexistant_memaccess &&
441 !no_exceptions) {
442 if (paddr >= mem->physical_max &&
443 paddr < mem->physical_max+1048576)
444 mips_cpu_exception(cpu,
445 EXCEPTION_DBE, 0, vaddr, 0,
446 0, 0, 0);
447 }
448 #endif /* MEM_MIPS */
449 }
450
451 /* Hm? Shouldn't there be a DBE exception for
452 invalid writes as well? TODO */
453
454 goto do_return_ok;
455 }
456 }
457
458 #endif /* ifndef MEM_USERLAND */
459
460
461 /*
462 * Uncached access:
463 *
464 * 1) Translate the physical address to a host address.
465 *
466 * 2) Insert this virtual->physical->host translation into the
467 * fast translation arrays (using update_translation_table()).
468 *
469 * 3) If this was a Write, then invalidate any code translations
470 * in that page.
471 */
472 memblock = memory_paddr_to_hostaddr(mem, paddr, writeflag);
473 if (memblock == NULL) {
474 if (writeflag == MEM_READ)
475 memset(data, 0, len);
476 goto do_return_ok;
477 }
478
479 offset = paddr & ((1 << BITS_PER_MEMBLOCK) - 1);
480
481 if (cpu->update_translation_table != NULL && !dyntrans_device_danger
482 #ifndef MEM_MIPS
483 /* && !(misc_flags & MEMORY_USER_ACCESS) */
484 #ifndef MEM_USERLAND
485 && !(ok & MEMORY_NOT_FULL_PAGE)
486 #endif
487 #endif
488 && !no_exceptions)
489 cpu->update_translation_table(cpu, vaddr & ~offset_mask,
490 memblock + (offset & ~offset_mask),
491 (misc_flags & MEMORY_USER_ACCESS) |
492 #ifndef MEM_MIPS
493 (cache == CACHE_INSTRUCTION? TLB_CODE : 0) |
494 #endif
495 #if !defined(MEM_MIPS) && !defined(MEM_USERLAND)
496 (cache == CACHE_INSTRUCTION?
497 (writeflag == MEM_WRITE? 1 : 0) : ok - 1),
498 #else
499 (writeflag == MEM_WRITE? 1 : 0),
500 #endif
501 paddr & ~offset_mask);
502
503 /* Invalidate code translations for the page we are writing to. */
504 if (writeflag == MEM_WRITE && cpu->invalidate_code_translation != NULL)
505 cpu->invalidate_code_translation(cpu, paddr, INVALIDATE_PADDR);
506
507 if (writeflag == MEM_WRITE) {
508 /* Ugly optimization, but it works: */
509 if (len == sizeof(uint32_t) && (offset & 3)==0
510 && ((size_t)data&3)==0)
511 *(uint32_t *)(memblock + offset) = *(uint32_t *)data;
512 else if (len == sizeof(uint8_t))
513 *(uint8_t *)(memblock + offset) = *(uint8_t *)data;
514 else
515 memcpy(memblock + offset, data, len);
516 } else {
517 /* Ugly optimization, but it works: */
518 if (len == sizeof(uint32_t) && (offset & 3)==0
519 && ((size_t)data&3)==0)
520 *(uint32_t *)data = *(uint32_t *)(memblock + offset);
521 else if (len == sizeof(uint8_t))
522 *(uint8_t *)data = *(uint8_t *)(memblock + offset);
523 else
524 memcpy(data, memblock + offset, len);
525 }
526
527
528 do_return_ok:
529 return MEMORY_ACCESS_OK;
530 }
531
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