/[gxemul]/trunk/src/cpus/cpu_x86_instr.c
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Contents of /trunk/src/cpus/cpu_x86_instr.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: 11001 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) 2005-2006 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: cpu_x86_instr.c,v 1.13 2006/04/22 18:07:30 debug Exp $
29 *
30 * x86/amd64 instructions.
31 *
32 * Individual functions should keep track of cpu->n_translated_instrs.
33 * (n_translated_instrs is automatically increased by 1 for each function
34 * call. If no instruction was executed, then it should be decreased. If, say,
35 * 4 instructions were combined into one function and executed, then it should
36 * be increased by 3.)
37 */
38
39
40 /*
41 * nop: Do nothing.
42 */
43 X(nop)
44 {
45 }
46
47
48 /*****************************************************************************/
49
50
51 /*
52 * sti, cli, std, cld, stc, clc: Set/clear flag bits.
53 */
54 X(stc) { cpu->cd.x86.rflags |= X86_FLAGS_CF; }
55 X(clc) { cpu->cd.x86.rflags &= ~X86_FLAGS_CF; }
56 X(std) { cpu->cd.x86.rflags |= X86_FLAGS_DF; }
57 X(cld) { cpu->cd.x86.rflags &= ~X86_FLAGS_DF; }
58 X(sti) { cpu->cd.x86.rflags |= X86_FLAGS_IF; }
59 X(cli) { cpu->cd.x86.rflags &= ~X86_FLAGS_IF; }
60
61
62 /*
63 * cpuid
64 */
65 X(cpuid)
66 {
67 x86_cpuid(cpu);
68 }
69
70
71 /*
72 * inc, dec
73 */
74 X(inc_ax)
75 {
76 MODE_uint_t r = cpu->cd.x86.r[X86_R_AX], r2 = r + 1;
77 cpu->cd.x86.r[X86_R_AX] = (r & ~0xffff) + (r2 & 0xffff);
78 }
79 X(inc_cx)
80 {
81 MODE_uint_t r = cpu->cd.x86.r[X86_R_CX], r2 = r + 1;
82 cpu->cd.x86.r[X86_R_CX] = (r & ~0xffff) + (r2 & 0xffff);
83 }
84 X(inc_dx)
85 {
86 MODE_uint_t r = cpu->cd.x86.r[X86_R_DX], r2 = r + 1;
87 cpu->cd.x86.r[X86_R_DX] = (r & ~0xffff) + (r2 & 0xffff);
88 }
89 X(inc_bx)
90 {
91 MODE_uint_t r = cpu->cd.x86.r[X86_R_BX], r2 = r + 1;
92 cpu->cd.x86.r[X86_R_BX] = (r & ~0xffff) + (r2 & 0xffff);
93 }
94 X(inc_sp)
95 {
96 MODE_uint_t r = cpu->cd.x86.r[X86_R_SP], r2 = r + 1;
97 cpu->cd.x86.r[X86_R_SP] = (r & ~0xffff) + (r2 & 0xffff);
98 }
99 X(inc_bp)
100 {
101 MODE_uint_t r = cpu->cd.x86.r[X86_R_BP], r2 = r + 1;
102 cpu->cd.x86.r[X86_R_BP] = (r & ~0xffff) + (r2 & 0xffff);
103 }
104 X(inc_si)
105 {
106 MODE_uint_t r = cpu->cd.x86.r[X86_R_SI], r2 = r + 1;
107 cpu->cd.x86.r[X86_R_SI] = (r & ~0xffff) + (r2 & 0xffff);
108 }
109 X(inc_di)
110 {
111 MODE_uint_t r = cpu->cd.x86.r[X86_R_DI], r2 = r + 1;
112 cpu->cd.x86.r[X86_R_DI] = (r & ~0xffff) + (r2 & 0xffff);
113 }
114 X(inc_eax) { cpu->cd.x86.r[X86_R_AX] ++; }
115 X(inc_ecx) { cpu->cd.x86.r[X86_R_CX] ++; }
116 X(inc_edx) { cpu->cd.x86.r[X86_R_DX] ++; }
117 X(inc_ebx) { cpu->cd.x86.r[X86_R_BX] ++; }
118 X(inc_esp) { cpu->cd.x86.r[X86_R_SP] ++; }
119 X(inc_ebp) { cpu->cd.x86.r[X86_R_BP] ++; }
120 X(inc_esi) { cpu->cd.x86.r[X86_R_SI] ++; }
121 X(inc_edi) { cpu->cd.x86.r[X86_R_DI] ++; }
122
123
124 /*
125 * mov_reg_imm_8:
126 *
127 * arg[1] = imm8
128 * arg[2] = pointer to a _byte_ inside an emulated register
129 */
130 X(mov_reg_imm_8)
131 {
132 *((uint8_t *)ic->arg[2]) = ic->arg[1];
133 }
134
135
136 /*
137 * mov_reg_imm_16, _32
138 */
139 X(mov_reg_imm_16)
140 {
141 reg(ic->arg[2]) &= ~0xffff;
142 reg(ic->arg[2]) |= ic->arg[1];
143 }
144 X(mov_reg_imm_32)
145 {
146 reg(ic->arg[2]) = (uint32_t)ic->arg[1];
147 }
148
149
150 /*****************************************************************************/
151
152
153 X(end_of_page)
154 {
155 /* Update the PC: (offset 0, but on the next page) */
156 cpu->pc &= ~(X86_IC_ENTRIES_PER_PAGE-1);
157 cpu->pc += X86_IC_ENTRIES_PER_PAGE;
158
159 /* Find the new physical page and update the translation pointers: */
160 x86_pc_to_pointers(cpu);
161
162 /* end_of_page doesn't count as an executed instruction: */
163 cpu->n_translated_instrs --;
164 }
165
166
167 /*****************************************************************************/
168
169
170 #ifdef GET_NEXT_BYTE
171 #undef GET_NEXT_BYTE
172 #endif
173 #ifdef MODE32
174 #define GET_NEXT_BYTE get_next_byte32
175 #else
176 #define GET_NEXT_BYTE get_next_byte64
177 #endif
178 /* Get the next instruction byte; return 1 on success, 0 on failure */
179 int GET_NEXT_BYTE(struct cpu *cpu, unsigned char *byte, MODE_uint_t addr)
180 {
181 unsigned char *page;
182
183 /* Read the instruction word from memory: */
184 #ifdef MODE32
185 page = cpu->cd.x86.host_load[addr >> 12];
186 #else
187 {
188 const uint32_t mask1 = (1 << DYNTRANS_L1N) - 1;
189 const uint32_t mask2 = (1 << DYNTRANS_L2N) - 1;
190 const uint32_t mask3 = (1 << DYNTRANS_L3N) - 1;
191 uint32_t x1 = (addr >> (64-DYNTRANS_L1N)) & mask1;
192 uint32_t x2 = (addr >> (64-DYNTRANS_L1N-DYNTRANS_L2N)) & mask2;
193 uint32_t x3 = (addr >> (64-DYNTRANS_L1N-DYNTRANS_L2N-
194 DYNTRANS_L3N)) & mask3;
195 struct DYNTRANS_L2_64_TABLE *l2 = cpu->cd.x86.l1_64[x1];
196 struct DYNTRANS_L3_64_TABLE *l3 = l2->l3[x2];
197 page = l3->host_load[x3];
198 }
199 #endif
200
201 if (page != NULL) {
202 /* fatal("TRANSLATION HIT!\n"); */
203 (*byte) = page[addr & 0xfff];
204 } else {
205 /* fatal("TRANSLATION MISS!\n"); */
206 if (!cpu->memory_rw(cpu, cpu->mem, addr, byte,
207 1, MEM_READ, CACHE_INSTRUCTION)) {
208 /* exception occurred, or similar */
209 return 0;
210 }
211 }
212
213 return 1;
214 }
215
216
217 #ifndef GNB
218 #define GNB { if (len >= sizeof(ib)) \
219 goto bad; \
220 if (!GET_NEXT_BYTE(cpu, &ib[len++], addr++)) \
221 goto gnb_failed; \
222 }
223 #endif
224
225
226 #ifndef GET_OP
227 #define GET_OP opimm = 0; \
228 { \
229 int i; \
230 for (i=0; i<oplen; i++) { \
231 GNB; \
232 opimm |= (ib[len-1] << (i*8)); \
233 } \
234 }
235 #endif
236
237
238 /*
239 * x86_instr_to_be_translated():
240 *
241 * Translate an instruction word into an x86_instr_call. ic is filled in with
242 * valid data for the translated instruction, or a "nothing" instruction if
243 * there was a translation failure. The newly translated instruction is then
244 * executed.
245 */
246 X(to_be_translated)
247 {
248 MODE_uint_t addr, orig_addr, low_pc;
249 int main_opcode, secondary_opcode, len, mode16, oplen;
250 uint32_t opimm;
251 unsigned char ib[17];
252 /* void (*samepage_function)(struct cpu *, struct x86_instr_call *); */
253
254 /* Figure out the (virtual) address of the instruction: */
255 low_pc = ((size_t)ic - (size_t)cpu->cd.x86.cur_ic_page)
256 / sizeof(struct x86_instr_call);
257 addr = cpu->pc & ~(X86_IC_ENTRIES_PER_PAGE-1);
258 addr += low_pc;
259 cpu->pc = addr;
260 orig_addr = addr;
261
262 if (!cpu->cd.x86.descr_cache[X86_S_CS].valid) {
263 fatal("x86_cpu_run_instr(): Invalid CS descriptor?\n");
264 exit(1);
265 }
266
267 cpu->cd.x86.cursegment = X86_S_CS;
268 cpu->cd.x86.seg_override = 0;
269
270
271 #define DYNTRANS_TO_BE_TRANSLATED_HEAD
272 #include "cpu_dyntrans.c"
273 #undef DYNTRANS_TO_BE_TRANSLATED_HEAD
274
275
276 /*
277 * Translate the instruction:
278 */
279
280 ic->arg[0] = len = 0;
281
282 if (LONG_MODE) {
283 fatal("LONG MODE: TODO\n");
284 goto bad;
285 }
286
287 mode16 = REAL_MODE;
288
289 /* Parse prefix bytes, and get the main (first) opcode byte: */
290 for (;;) {
291 GNB; main_opcode = ib[len - 1];
292 if (main_opcode == 0x66) {
293 mode16 = !mode16;
294 } else {
295 /* Found a non-prefix byte? Then break. */
296 break;
297 }
298 }
299
300 oplen = mode16? sizeof(uint16_t) : sizeof(uint32_t);
301
302 switch (main_opcode) {
303
304 case 0x0f:
305 GNB; secondary_opcode = ib[len-1];
306 switch (secondary_opcode) {
307
308 case 0xa2:
309 ic->f = instr(cpuid);
310 break;
311
312 default:fatal("unimplemented 0x0f opcode 0x%02x\n",
313 secondary_opcode);
314 goto bad;
315 }
316 break;
317
318 case 0x40: /* inc ax etc. */
319 case 0x41:
320 case 0x42:
321 case 0x43:
322 case 0x44:
323 case 0x45:
324 case 0x46:
325 case 0x47:
326 if (mode16) {
327 switch (main_opcode) {
328 case 0x40: ic->f = instr(inc_ax); break;
329 case 0x41: ic->f = instr(inc_cx); break;
330 case 0x42: ic->f = instr(inc_dx); break;
331 case 0x43: ic->f = instr(inc_bx); break;
332 case 0x44: ic->f = instr(inc_sp); break;
333 case 0x45: ic->f = instr(inc_bp); break;
334 case 0x46: ic->f = instr(inc_si); break;
335 case 0x47: ic->f = instr(inc_di); break;
336 }
337 } else {
338 switch (main_opcode) {
339 case 0x40: ic->f = instr(inc_eax); break;
340 case 0x41: ic->f = instr(inc_ecx); break;
341 case 0x42: ic->f = instr(inc_edx); break;
342 case 0x43: ic->f = instr(inc_ebx); break;
343 case 0x44: ic->f = instr(inc_esp); break;
344 case 0x45: ic->f = instr(inc_ebp); break;
345 case 0x46: ic->f = instr(inc_esi); break;
346 case 0x47: ic->f = instr(inc_edi); break;
347 }
348 }
349 break;
350
351 case 0x90: /* nop */
352 ic->f = instr(nop);
353 break;
354
355 case 0xb0: /* mov al,imm etc. */
356 case 0xb1:
357 case 0xb2:
358 case 0xb3:
359 case 0xb4:
360 case 0xb5:
361 case 0xb6:
362 case 0xb7:
363 GNB;
364 ic->arg[1] = ib[len - 1];
365 /* Calculate for little endian first: */
366 ic->arg[2] = (size_t)&cpu->cd.x86.r[main_opcode & 3];
367 if (main_opcode >= 0xb4)
368 ic->arg[2] ++;
369 #ifdef HOST_BIG_ENDIAN
370 /* Switch byte order: */
371 ic->arg[2] = (ic->arg[2] & ~(sizeof(uint64_t)-1)) +
372 sizeof(uint64_t) - 1 - (ic->arg[2] & (sizeof(uint64_t)-1));
373 #endif
374 ic->f = instr(mov_reg_imm_8);
375 break;
376
377 case 0xb8: /* mov ax,imm etc. */
378 case 0xb9:
379 case 0xba:
380 case 0xbb:
381 case 0xbc:
382 case 0xbd:
383 case 0xbe:
384 case 0xbf:
385 GET_OP;
386 ic->arg[1] = opimm;
387 ic->arg[2] = (size_t)&cpu->cd.x86.r[main_opcode - 0xb8];
388 if (mode16)
389 ic->f = instr(mov_reg_imm_16);
390 else
391 ic->f = instr(mov_reg_imm_32);
392 break;
393
394 case 0xf8: /* clc */
395 case 0xf9: /* stc */
396 case 0xfa: /* cli */
397 case 0xfb: /* sti */
398 case 0xfc: /* cld */
399 case 0xfd: /* std */
400 switch (main_opcode) {
401 case 0xf8: ic->f = instr(sti); break;
402 case 0xf9: ic->f = instr(stc); break;
403 case 0xfa: ic->f = instr(cli); break;
404 case 0xfb: ic->f = instr(sti); break;
405 case 0xfc: ic->f = instr(cld); break;
406 case 0xfd: ic->f = instr(std); break;
407 }
408 break;
409
410 default:goto bad;
411 }
412
413
414 if (((addr-1) & ~0xfff) != (orig_addr & ~0xfff)) {
415 fatal("Instruction crosses page boundary. TODO\n");
416 exit(1);
417 }
418
419 if (len > sizeof(ib)) {
420 fatal("INTERNAL ERROR in cpu_x86_instr.c! len = %i\n", len);
421 exit(1);
422 }
423
424 ic->arg[0] = len;
425 goto ok;
426
427
428 /* We get here if get_next_byte failed (i.e. an excepion occured while
429 crossing a page-boundary...) */
430 gnb_failed:
431 ic->f = instr(to_be_translated);
432 ic->arg[0] = 0;
433 /* The program counter etc. should already have been updated. */
434 return;
435
436 ok:
437
438 #define DYNTRANS_TO_BE_TRANSLATED_TAIL
439 #include "cpu_dyntrans.c"
440 #undef DYNTRANS_TO_BE_TRANSLATED_TAIL
441 }
442
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