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++ trunk/HISTORY (local) $Id: HISTORY,v 1.1539 2007/05/01 04:03:51 debug Exp $ 20070415 Landisk PCLOCK should be 33.33 MHz, not 50 MHz. (This makes the clock run at correct speed.) FINALLY found and fixed the bug which caused OpenBSD/landisk to randomly bug out: an &-sign was missing in the special case handling of FPSCR in the 'LDS.L @Rm+,FPSCR' instruction. Adding similar special case handling for 'LDC.L @Rm+,SR' (calling sh_update_sr() instead of just loading). Implementing the 'FCNVSD FPUL,DRn' and 'FCNVDS DRm,FPUL' SuperH instructions. The 'LDC Rm,SR' instruction now immediately breaks out of the dyntrans loop if an interrupt is to be triggered. 20070416 In memory_rw.c, if mapping a page as writable, make sure to invalidate code translations even if the data access was a read. Minor SuperH updates. 20070418 Removing the dummy M68K emulation mode. Minor SH update (turning unnecessary sts_mach_rn, sts_macl_rn, and sts_pr_rn instruction handlers into mov_rm_rn). 20070419 Beginning to add a skeleton for an M88K mode: Adding a hack to allow OpenBSD/m88k a.out binaries to be loaded, and disassembly of a few simple 88K instructions. Commenting out the 'LDC Rm,SR' fix from a few days ago, because it made Linux/dreamcast bug out. Adding a hack to dev_sh4.c (an extra translation cache invalidation), which allows OpenBSD/landisk to boot ok after an install. Upgrading the Landisk machine mode to stable, updating documentation, etc. 20070420 Experimenting with adding a PCI controller (pcic) to dev_sh4. Adding a dummy Realtek 8139C+ skeleton device (dev_rtl8139c). Implementing the first M88K instructions (br, or[.u] imm), and adding disassembly of some more instructions. 20070421 Continuing a little on dev_rtl8139c. 20070422 Implementing the 9346 EEPROM "read" command for dev_rtl8139c. Finally found and fixed an old bug in the log n symbol search (it sometimes missed symbols). Debug trace (-i, -t etc) should now show more symbols. :-) 20070423 Continuing a little on M88K disassembly. 20070428 Fixing a memset arg order bug in src/net/net.c (thanks to Nigel Horne for noticing the bug). Applying parts of a patch from Carl van Schaik to clear out bottom bits of MIPS addresses more correctly, when using large page sizes, and doing some other minor cleanup/refactoring. Fixing a couple of warnings given by gcc with the -W option (a few more warnings than just plain -Wall). Reducing SuperH dyntrans physical address space from 64-bit to 32-bit (since SH5/SH64 isn't imlemented yet anyway). Adding address-to-symbol annotation to a few more instructions in the SuperH instruction trace output. Beginning regression testing for the next release. Reverting the value of SCIF_DELAYED_TX_VALUE from 1 to 2, because OpenBSD/landisk may otherwise hang randomly. 20070429 The ugly hack/workaround to get OpenBSD/landisk booting without crashing does NOT work anymore (with the April 21 snapshot of OpenBSD/landisk). Strangely enough, removing the hack completely causes OpenBSD/landisk to work (!). More regression testing (re-testing everything SuperH-related, and some other things). Cobalt interrupts were actually broken; fixing by commenting out the DEC21143s in the Cobalt machine. 20070430 More regression testing. 20070501 Updating the OpenBSD/landisk install instructions to use 4.1 instead of the current snapshot. GAAAH! OpenBSD/landisk 4.1 _needs_ the ugly hack/workaround; reintroducing it again. (The 4.1 kernel is actually from 2007-03-11.) Simplifying the NetBSD/evbarm install instructions a bit. More regression testing. ============== RELEASE 0.4.5.1 ==============
1 | dpavlin | 40 | Gavare's eXperimental Emulator -- GXemul 0.4.5.1 |
2 | ==================================================== | ||
3 | dpavlin | 2 | |
4 | dpavlin | 34 | Copyright (C) 2003-2007 Anders Gavare. |
5 | dpavlin | 2 | |
6 | |||
7 | dpavlin | 24 | Overview -- What is GXemul? |
8 | ----------------------------- | ||
9 | dpavlin | 2 | |
10 | dpavlin | 14 | GXemul is an experimental instruction-level machine emulator. Several |
11 | emulation modes are available. In some modes, processors and surrounding | ||
12 | dpavlin | 12 | hardware components are emulated well enough to let unmodified operating |
13 | systems (e.g. NetBSD) run as if they were running on a real machine. | ||
14 | dpavlin | 2 | |
15 | dpavlin | 40 | Processors (ARM, MIPS, PowerPC, and SuperH) are emulated using dynamic |
16 | dpavlin | 34 | translation. Unlike some other dynamically translating emulators, GXemul |
17 | does not need to generate native code, only a "runnable intermediate | ||
18 | representation", and will thus run on any host architecture. | ||
19 | dpavlin | 2 | |
20 | dpavlin | 34 | The documentation lists the machines and guest operating systems that can |
21 | be regarded as "working" in GXemul. The best working guest operating | ||
22 | systems are probably NetBSD/pmax and NetBSD/cats. | ||
23 | |||
24 | dpavlin | 24 | Possible uses of the emulator include: |
25 | dpavlin | 12 | |
26 | dpavlin | 24 | o) educational purposes, e.g. to learn how to write code for MIPS |
27 | dpavlin | 20 | |
28 | dpavlin | 24 | o) hobby operating system development; the emulator can be used as a |
29 | complement to testing your code on real hardware | ||
30 | |||
31 | o) running guest operating systems in a "sandboxed" environment | ||
32 | |||
33 | o) compiling your source code inside a guest operating system which you | ||
34 | otherwise would not have access to (e.g. various exotic ports of | ||
35 | NetBSD), to make sure that your source code is portable to those | ||
36 | platforms | ||
37 | |||
38 | o) simulating (ethernet) networks of computers running various | ||
39 | operating systems, to study their interaction with each other | ||
40 | |||
41 | o) debugging code in general | ||
42 | |||
43 | Use your imagination :-) | ||
44 | |||
45 | |||
46 | GXemul's limitations | ||
47 | -------------------- | ||
48 | |||
49 | o) GXemul is not (in general) a cycle-accurate simulator, because it does | ||
50 | not simulate things smaller than an instruction. Pipe-line stalls, | ||
51 | instruction latency effects etc. are more or less completely ignored. | ||
52 | |||
53 | o) Hardware devices have been implemented in an ad-hoc and as-needed | ||
54 | manner, usually only enough to fool certain guest operating systems | ||
55 | (e.g. NetBSD) that the hardware devices exist and function well | ||
56 | enough for those guest operating systems to use them. | ||
57 | |||
58 | A consequence of this is that a machine mode may be implemented well | ||
59 | enough to run NetBSD for that machine mode, but other guest operating | ||
60 | systems may not run at all, or behave strangely. | ||
61 | |||
62 | |||
63 | dpavlin | 2 | Quick start |
64 | ----------- | ||
65 | |||
66 | dpavlin | 4 | To compile, type './configure' and then 'make'. This should work on most |
67 | dpavlin | 28 | Unix-like systems. If it does not, then please mail me a bug report. |
68 | dpavlin | 2 | |
69 | dpavlin | 24 | You might want to experiment with various CC and CFLAGS environment |
70 | variable settings, to get optimum performance. | ||
71 | |||
72 | dpavlin | 10 | If you are impatient, and want to try out running a guest operating system |
73 | dpavlin | 22 | inside GXemul, read this: doc/guestoses.html#netbsdcatsinstall |
74 | dpavlin | 2 | |
75 | dpavlin | 10 | If you want to use GXemul for experimenting with code of your own, |
76 | then I suggest you compile a Hello World program according to the tips | ||
77 | listed here: doc/experiments.html#hello | ||
78 | dpavlin | 2 | |
79 | dpavlin | 10 | Please read the rest of the documentation in the doc/ sub-directory for |
80 | more detailed information on how to use the emulator. | ||
81 | |||
82 | |||
83 | dpavlin | 2 | Feedback |
84 | -------- | ||
85 | |||
86 | If you have found GXemul useful in some way, or feel like sending me | ||
87 | comments or feedback in general, then mail me at anders(at)gavare.se. | ||
88 |
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