translate-copy.c@ 13480

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1	/*
2	* i386 on i386 translation
3	*
4	* Copyright (c) 2003 Fabrice Bellard
5	*
6	* This library is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU Lesser General Public
8	* License as published by the Free Software Foundation; either
9	* version 2 of the License, or (at your option) any later version.
10	*
11	* This library is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14	* Lesser General Public License for more details.
15	*
16	* You should have received a copy of the GNU Lesser General Public
17	* License along with this library; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19	*/
20
21	/*
22	* Sun LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
23	* other than GPL or LGPL is available it will apply instead, Sun elects to use only
24	* the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
25	* a choice of LGPL license versions is made available with the language indicating
26	* that LGPLv2 or any later version may be used, or where a choice of which version
27	* of the LGPL is applied is otherwise unspecified.
28	*/
29	#include "config.h"
30
31	#include <stdarg.h>
32	#include <stdlib.h>
33	#include <stdio.h>
34	#include <string.h>
35	#include <inttypes.h>
36	#include <assert.h>
37
38	#include "cpu.h"
39	#include "exec-all.h"
40	#include "disas.h"
41
42	#ifdef USE_CODE_COPY
43
44	#include <signal.h>
45	#include <sys/mman.h>
46	#include <sys/ucontext.h>
47
48	extern char exec_loop;
49
50	/* operand size */
51	enum {
52	OT_BYTE = 0,
53	OT_WORD,
54	OT_LONG,
55	OT_QUAD,
56	};
57
58	#define PREFIX_REPZ 0x01
59	#define PREFIX_REPNZ 0x02
60	#define PREFIX_LOCK 0x04
61	#define PREFIX_DATA 0x08
62	#define PREFIX_ADR 0x10
63
64	typedef struct DisasContext {
65	/* current insn context */
66	int override; /* -1 if no override */
67	int prefix;
68	int aflag, dflag;
69	target_ulong pc; /* pc = eip + cs_base */
70	int is_jmp; /* 1 = means jump (stop translation), 2 means CPU
71	static state change (stop translation) */
72	/* code output */
73	uint8_t *gen_code_ptr;
74	uint8_t *gen_code_start;
75
76	/* current block context */
77	target_ulong cs_base; /* base of CS segment */
78	int pe; /* protected mode */
79	int code32; /* 32 bit code segment */
80	int f_st; /* currently unused */
81	int vm86; /* vm86 mode */
82	int cpl;
83	int iopl;
84	int flags;
85	struct TranslationBlock *tb;
86	} DisasContext;
87
88	#define CPU_FIELD_OFFSET(field) offsetof(CPUState, field)
89
90	#define CPU_SEG 0x64 /* fs override */
91
92	static inline void gb(DisasContext *s, uint32_t val)
93	{
94	*s->gen_code_ptr++ = val;
95	}
96
97	static inline void gw(DisasContext *s, uint32_t val)
98	{
99	*s->gen_code_ptr++ = val;
100	*s->gen_code_ptr++ = val >> 8;
101	}
102
103	static inline void gl(DisasContext *s, uint32_t val)
104	{
105	*s->gen_code_ptr++ = val;
106	*s->gen_code_ptr++ = val >> 8;
107	*s->gen_code_ptr++ = val >> 16;
108	*s->gen_code_ptr++ = val >> 24;
109	}
110
111	static inline void gjmp(DisasContext *s, long val)
112	{
113	gb(s, 0xe9); /* jmp */
114	gl(s, val - (long)(s->gen_code_ptr + 4));
115	}
116
117	static inline void gen_movl_addr_im(DisasContext *s,
118	uint32_t addr, uint32_t val)
119	{
120	gb(s, CPU_SEG); /* seg movl im, addr */
121	gb(s, 0xc7);
122	gb(s, 0x05);
123	gl(s, addr);
124	gl(s, val);
125	}
126
127	static inline void gen_movw_addr_im(DisasContext *s,
128	uint32_t addr, uint32_t val)
129	{
130	gb(s, CPU_SEG); /* seg movl im, addr */
131	gb(s, 0x66);
132	gb(s, 0xc7);
133	gb(s, 0x05);
134	gl(s, addr);
135	gw(s, val);
136	}
137
138
139	static void gen_jmp(DisasContext *s, uint32_t target_eip)
140	{
141	TranslationBlock *tb = s->tb;
142
143	gb(s, 0xe9); /* jmp */
144	tb->tb_jmp_offset[0] = s->gen_code_ptr - s->gen_code_start;
145	gl(s, 0);
146
147	tb->tb_next_offset[0] = s->gen_code_ptr - s->gen_code_start;
148	gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), target_eip);
149	gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb);
150	gjmp(s, (long)&exec_loop);
151
152	s->is_jmp = 1;
153	}
154
155	static void gen_jcc(DisasContext *s, int op,
156	uint32_t target_eip, uint32_t next_eip)
157	{
158	TranslationBlock *tb = s->tb;
159
160	gb(s, 0x0f); /* jcc */
161	gb(s, 0x80 + op);
162	tb->tb_jmp_offset[0] = s->gen_code_ptr - s->gen_code_start;
163	gl(s, 0);
164	gb(s, 0xe9); /* jmp */
165	tb->tb_jmp_offset[1] = s->gen_code_ptr - s->gen_code_start;
166	gl(s, 0);
167
168	tb->tb_next_offset[0] = s->gen_code_ptr - s->gen_code_start;
169	gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), target_eip);
170	gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb);
171	gjmp(s, (long)&exec_loop);
172
173	tb->tb_next_offset[1] = s->gen_code_ptr - s->gen_code_start;
174	gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), next_eip);
175	gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb \| 1);
176	gjmp(s, (long)&exec_loop);
177
178	s->is_jmp = 1;
179	}
180
181	static void gen_eob(DisasContext *s)
182	{
183	gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), 0);
184	gjmp(s, (long)&exec_loop);
185
186	s->is_jmp = 1;
187	}
188
189	static inline void gen_lea_modrm(DisasContext *s, int modrm)
190	{
191	int havesib;
192	int base, disp;
193	int index;
194	int scale;
195	int mod, rm, code;
196
197	mod = (modrm >> 6) & 3;
198	rm = modrm & 7;
199
200	if (s->aflag) {
201
202	havesib = 0;
203	base = rm;
204	index = 0;
205	scale = 0;
206
207	if (base == 4) {
208	havesib = 1;
209	code = ldub_code(s->pc++);
210	scale = (code >> 6) & 3;
211	index = (code >> 3) & 7;
212	base = code & 7;
213	}
214
215	switch (mod) {
216	case 0:
217	if (base == 5) {
218	base = -1;
219	disp = ldl_code(s->pc);
220	s->pc += 4;
221	} else {
222	disp = 0;
223	}
224	break;
225	case 1:
226	disp = (int8_t)ldub_code(s->pc++);
227	break;
228	default:
229	case 2:
230	disp = ldl_code(s->pc);
231	s->pc += 4;
232	break;
233	}
234
235	} else {
236	switch (mod) {
237	case 0:
238	if (rm == 6) {
239	disp = lduw_code(s->pc);
240	s->pc += 2;
241	} else {
242	disp = 0;
243	}
244	break;
245	case 1:
246	disp = (int8_t)ldub_code(s->pc++);
247	break;
248	default:
249	case 2:
250	disp = lduw_code(s->pc);
251	s->pc += 2;
252	break;
253	}
254	}
255	}
256
257	static inline void parse_modrm(DisasContext *s, int modrm)
258	{
259	if ((modrm & 0xc0) != 0xc0)
260	gen_lea_modrm(s, modrm);
261	}
262
263	static inline uint32_t insn_get(DisasContext *s, int ot)
264	{
265	uint32_t ret;
266
267	switch(ot) {
268	case OT_BYTE:
269	ret = ldub_code(s->pc);
270	s->pc++;
271	break;
272	case OT_WORD:
273	ret = lduw_code(s->pc);
274	s->pc += 2;
275	break;
276	default:
277	case OT_LONG:
278	ret = ldl_code(s->pc);
279	s->pc += 4;
280	break;
281	}
282	return ret;
283	}
284
285	/* convert one instruction. s->is_jmp is set if the translation must
286	be stopped. */
287	static int disas_insn(DisasContext *s)
288	{
289	target_ulong pc_start, pc_tmp, pc_start_insn;
290	int b, prefixes, aflag, dflag, next_eip, val;
291	int ot;
292	int modrm, mod, op, rm;
293
294	pc_start = s->pc;
295	prefixes = 0;
296	aflag = s->code32;
297	dflag = s->code32;
298	s->override = -1;
299	next_byte:
300	b = ldub_code(s->pc);
301	s->pc++;
302	/* check prefixes */
303	switch (b) {
304	case 0xf3:
305	prefixes \|= PREFIX_REPZ;
306	goto next_byte;
307	case 0xf2:
308	prefixes \|= PREFIX_REPNZ;
309	goto next_byte;
310	case 0xf0:
311	prefixes \|= PREFIX_LOCK;
312	goto next_byte;
313	case 0x2e:
314	s->override = R_CS;
315	goto next_byte;
316	case 0x36:
317	s->override = R_SS;
318	goto next_byte;
319	case 0x3e:
320	s->override = R_DS;
321	goto next_byte;
322	case 0x26:
323	s->override = R_ES;
324	goto next_byte;
325	case 0x64:
326	s->override = R_FS;
327	goto next_byte;
328	case 0x65:
329	s->override = R_GS;
330	goto next_byte;
331	case 0x66:
332	prefixes \|= PREFIX_DATA;
333	goto next_byte;
334	case 0x67:
335	prefixes \|= PREFIX_ADR;
336	goto next_byte;
337	}
338
339	if (prefixes & PREFIX_DATA)
340	dflag ^= 1;
341	if (prefixes & PREFIX_ADR)
342	aflag ^= 1;
343
344	s->prefix = prefixes;
345	s->aflag = aflag;
346	s->dflag = dflag;
347
348	/* lock generation */
349	if (prefixes & PREFIX_LOCK)
350	goto unsupported_op;
351	if (s->override == R_FS \|\| s->override == R_GS \|\| s->override == R_CS)
352	goto unsupported_op;
353
354	pc_start_insn = s->pc - 1;
355	/* now check op code */
356	reswitch:
357	switch(b) {
358	case 0x0f:
359	/**************************/
360	/* extended op code */
361	b = ldub_code(s->pc++) \| 0x100;
362	goto reswitch;
363
364	/**************************/
365	/* arith & logic */
366	case 0x00 ... 0x05:
367	case 0x08 ... 0x0d:
368	case 0x10 ... 0x15:
369	case 0x18 ... 0x1d:
370	case 0x20 ... 0x25:
371	case 0x28 ... 0x2d:
372	case 0x30 ... 0x35:
373	case 0x38 ... 0x3d:
374	{
375	int f;
376	f = (b >> 1) & 3;
377
378	if ((b & 1) == 0)
379	ot = OT_BYTE;
380	else
381	ot = dflag ? OT_LONG : OT_WORD;
382
383	switch(f) {
384	case 0: /* OP Ev, Gv */
385	modrm = ldub_code(s->pc++);
386	parse_modrm(s, modrm);
387	break;
388	case 1: /* OP Gv, Ev */
389	modrm = ldub_code(s->pc++);
390	parse_modrm(s, modrm);
391	break;
392	case 2: /* OP A, Iv */
393	insn_get(s, ot);
394	break;
395	}
396	}
397	break;
398
399	case 0x80: /* GRP1 */
400	case 0x81:
401	case 0x82:
402	case 0x83:
403	{
404	if ((b & 1) == 0)
405	ot = OT_BYTE;
406	else
407	ot = dflag ? OT_LONG : OT_WORD;
408
409	modrm = ldub_code(s->pc++);
410	parse_modrm(s, modrm);
411
412	switch(b) {
413	default:
414	case 0x80:
415	case 0x81:
416	case 0x82:
417	insn_get(s, ot);
418	break;
419	case 0x83:
420	insn_get(s, OT_BYTE);
421	break;
422	}
423	}
424	break;
425
426	/**************************/
427	/* inc, dec, and other misc arith */
428	case 0x40 ... 0x47: /* inc Gv */
429	break;
430	case 0x48 ... 0x4f: /* dec Gv */
431	break;
432	case 0xf6: /* GRP3 */
433	case 0xf7:
434	if ((b & 1) == 0)
435	ot = OT_BYTE;
436	else
437	ot = dflag ? OT_LONG : OT_WORD;
438
439	modrm = ldub_code(s->pc++);
440	op = (modrm >> 3) & 7;
441	parse_modrm(s, modrm);
442
443	switch(op) {
444	case 0: /* test */
445	insn_get(s, ot);
446	break;
447	case 2: /* not */
448	break;
449	case 3: /* neg */
450	break;
451	case 4: /* mul */
452	break;
453	case 5: /* imul */
454	break;
455	case 6: /* div */
456	break;
457	case 7: /* idiv */
458	break;
459	default:
460	goto illegal_op;
461	}
462	break;
463
464	case 0xfe: /* GRP4 */
465	case 0xff: /* GRP5 */
466	if ((b & 1) == 0)
467	ot = OT_BYTE;
468	else
469	ot = dflag ? OT_LONG : OT_WORD;
470
471	modrm = ldub_code(s->pc++);
472	mod = (modrm >> 6) & 3;
473	op = (modrm >> 3) & 7;
474	if (op >= 2 && b == 0xfe) {
475	goto illegal_op;
476	}
477	pc_tmp = s->pc;
478	parse_modrm(s, modrm);
479
480	switch(op) {
481	case 0: /* inc Ev */
482	break;
483	case 1: /* dec Ev */
484	break;
485	case 2: /* call Ev */
486	/* XXX: optimize and handle MEM exceptions specifically
487	fs movl %eax, regs[0]
488	movl Ev, %eax
489	pushl next_eip
490	fs movl %eax, eip
491	*/
492	goto unsupported_op;
493	case 3: /* lcall Ev */
494	goto unsupported_op;
495	case 4: /* jmp Ev */
496	/* XXX: optimize and handle MEM exceptions specifically
497	fs movl %eax, regs[0]
498	movl Ev, %eax
499	fs movl %eax, eip
500	*/
501	goto unsupported_op;
502	case 5: /* ljmp Ev */
503	goto unsupported_op;
504	case 6: /* push Ev */
505	break;
506	default:
507	goto illegal_op;
508	}
509	break;
510	case 0xa8: /* test eAX, Iv */
511	case 0xa9:
512	if ((b & 1) == 0)
513	ot = OT_BYTE;
514	else
515	ot = dflag ? OT_LONG : OT_WORD;
516	insn_get(s, ot);
517	break;
518
519	case 0x98: /* CWDE/CBW */
520	break;
521	case 0x99: /* CDQ/CWD */
522	break;
523	case 0x1af: /* imul Gv, Ev */
524	case 0x69: /* imul Gv, Ev, I */
525	case 0x6b:
526	ot = dflag ? OT_LONG : OT_WORD;
527	modrm = ldub_code(s->pc++);
528	parse_modrm(s, modrm);
529	if (b == 0x69) {
530	insn_get(s, ot);
531	} else if (b == 0x6b) {
532	insn_get(s, OT_BYTE);
533	} else {
534	}
535	break;
536
537	case 0x84: /* test Ev, Gv */
538	case 0x85:
539
540	case 0x1c0:
541	case 0x1c1: /* xadd Ev, Gv */
542
543	case 0x1b0:
544	case 0x1b1: /* cmpxchg Ev, Gv */
545
546	case 0x8f: /* pop Ev */
547
548	case 0x88:
549	case 0x89: /* mov Gv, Ev */
550
551	case 0x8a:
552	case 0x8b: /* mov Ev, Gv */
553
554	case 0x1b6: /* movzbS Gv, Eb */
555	case 0x1b7: /* movzwS Gv, Eb */
556	case 0x1be: /* movsbS Gv, Eb */
557	case 0x1bf: /* movswS Gv, Eb */
558
559	case 0x86:
560	case 0x87: /* xchg Ev, Gv */
561
562	case 0xd0:
563	case 0xd1: /* shift Ev,1 */
564
565	case 0xd2:
566	case 0xd3: /* shift Ev,cl */
567
568	case 0x1a5: /* shld cl */
569	case 0x1ad: /* shrd cl */
570
571	case 0x190 ... 0x19f: /* setcc Gv */
572
573	/* XXX: emulate cmov if not available ? */
574	case 0x140 ... 0x14f: /* cmov Gv, Ev */
575
576	case 0x1a3: /* bt Gv, Ev */
577	case 0x1ab: /* bts */
578	case 0x1b3: /* btr */
579	case 0x1bb: /* btc */
580
581	case 0x1bc: /* bsf */
582	case 0x1bd: /* bsr */
583
584	modrm = ldub_code(s->pc++);
585	parse_modrm(s, modrm);
586	break;
587
588	case 0x1c7: /* cmpxchg8b */
589	modrm = ldub_code(s->pc++);
590	mod = (modrm >> 6) & 3;
591	if (mod == 3)
592	goto illegal_op;
593	parse_modrm(s, modrm);
594	break;
595
596	/**************************/
597	/* push/pop */
598	case 0x50 ... 0x57: /* push */
599	case 0x58 ... 0x5f: /* pop */
600	case 0x60: /* pusha */
601	case 0x61: /* popa */
602	break;
603
604	case 0x68: /* push Iv */
605	case 0x6a:
606	ot = dflag ? OT_LONG : OT_WORD;
607	if (b == 0x68)
608	insn_get(s, ot);
609	else
610	insn_get(s, OT_BYTE);
611	break;
612	case 0xc8: /* enter */
613	lduw_code(s->pc);
614	s->pc += 2;
615	ldub_code(s->pc++);
616	break;
617	case 0xc9: /* leave */
618	break;
619
620	case 0x06: /* push es */
621	case 0x0e: /* push cs */
622	case 0x16: /* push ss */
623	case 0x1e: /* push ds */
624	/* XXX: optimize:
625	push segs[n].selector
626	*/
627	goto unsupported_op;
628	case 0x1a0: /* push fs */
629	case 0x1a8: /* push gs */
630	goto unsupported_op;
631	case 0x07: /* pop es */
632	case 0x17: /* pop ss */
633	case 0x1f: /* pop ds */
634	goto unsupported_op;
635	case 0x1a1: /* pop fs */
636	case 0x1a9: /* pop gs */
637	goto unsupported_op;
638	case 0x8e: /* mov seg, Gv */
639	/* XXX: optimize:
640	fs movl r, regs[]
641	movl segs[].selector, r
642	mov r, Gv
643	fs movl regs[], r
644	*/
645	goto unsupported_op;
646	case 0x8c: /* mov Gv, seg */
647	goto unsupported_op;
648	case 0xc4: /* les Gv */
649	op = R_ES;
650	goto do_lxx;
651	case 0xc5: /* lds Gv */
652	op = R_DS;
653	goto do_lxx;
654	case 0x1b2: /* lss Gv */
655	op = R_SS;
656	goto do_lxx;
657	case 0x1b4: /* lfs Gv */
658	op = R_FS;
659	goto do_lxx;
660	case 0x1b5: /* lgs Gv */
661	op = R_GS;
662	do_lxx:
663	goto unsupported_op;
664	/************************/
665	/* floats */
666	case 0xd8 ... 0xdf:
667	#if 1
668	/* currently not stable enough */
669	goto unsupported_op;
670	#else
671	if (s->flags & (HF_EM_MASK \| HF_TS_MASK))
672	goto unsupported_op;
673	#endif
674	#if 0
675	/* for testing FPU context switch */
676	{
677	static int count;
678	count = (count + 1) % 3;
679	if (count != 0)
680	goto unsupported_op;
681	}
682	#endif
683	modrm = ldub_code(s->pc++);
684	mod = (modrm >> 6) & 3;
685	rm = modrm & 7;
686	op = ((b & 7) << 3) \| ((modrm >> 3) & 7);
687	if (mod != 3) {
688	/* memory op */
689	parse_modrm(s, modrm);
690	switch(op) {
691	case 0x00 ... 0x07: /* fxxxs */
692	case 0x10 ... 0x17: /* fixxxl */
693	case 0x20 ... 0x27: /* fxxxl */
694	case 0x30 ... 0x37: /* fixxx */
695	break;
696	case 0x08: /* flds */
697	case 0x0a: /* fsts */
698	case 0x0b: /* fstps */
699	case 0x18: /* fildl */
700	case 0x1a: /* fistl */
701	case 0x1b: /* fistpl */
702	case 0x28: /* fldl */
703	case 0x2a: /* fstl */
704	case 0x2b: /* fstpl */
705	case 0x38: /* filds */
706	case 0x3a: /* fists */
707	case 0x3b: /* fistps */
708	case 0x0c: /* fldenv mem */
709	case 0x0d: /* fldcw mem */
710	case 0x0e: /* fnstenv mem */
711	case 0x0f: /* fnstcw mem */
712	case 0x1d: /* fldt mem */
713	case 0x1f: /* fstpt mem */
714	case 0x2c: /* frstor mem */
715	case 0x2e: /* fnsave mem */
716	case 0x2f: /* fnstsw mem */
717	case 0x3c: /* fbld */
718	case 0x3e: /* fbstp */
719	case 0x3d: /* fildll */
720	case 0x3f: /* fistpll */
721	break;
722	default:
723	goto illegal_op;
724	}
725	} else {
726	/* register float ops */
727	switch(op) {
728	case 0x08: /* fld sti */
729	case 0x09: /* fxchg sti */
730	break;
731	case 0x0a: /* grp d9/2 */
732	switch(rm) {
733	case 0: /* fnop */
734	break;
735	default:
736	goto illegal_op;
737	}
738	break;
739	case 0x0c: /* grp d9/4 */
740	switch(rm) {
741	case 0: /* fchs */
742	case 1: /* fabs */
743	case 4: /* ftst */
744	case 5: /* fxam */
745	break;
746	default:
747	goto illegal_op;
748	}
749	break;
750	case 0x0d: /* grp d9/5 */
751	switch(rm) {
752	case 0:
753	case 1:
754	case 2:
755	case 3:
756	case 4:
757	case 5:
758	case 6:
759	break;
760	default:
761	goto illegal_op;
762	}
763	break;
764	case 0x0e: /* grp d9/6 */
765	break;
766	case 0x0f: /* grp d9/7 */
767	break;
768	case 0x00: case 0x01: case 0x04 ... 0x07: /* fxxx st, sti */
769	case 0x20: case 0x21: case 0x24 ... 0x27: /* fxxx sti, st */
770	case 0x30: case 0x31: case 0x34 ... 0x37: /* fxxxp sti, st */
771	break;
772	case 0x02: /* fcom */
773	break;
774	case 0x03: /* fcomp */
775	break;
776	case 0x15: /* da/5 */
777	switch(rm) {
778	case 1: /* fucompp */
779	break;
780	default:
781	goto illegal_op;
782	}
783	break;
784	case 0x1c:
785	switch(rm) {
786	case 0: /* feni (287 only, just do nop here) */
787	case 1: /* fdisi (287 only, just do nop here) */
788	goto unsupported_op;
789	case 2: /* fclex */
790	case 3: /* fninit */
791	case 4: /* fsetpm (287 only, just do nop here) */
792	break;
793	default:
794	goto illegal_op;
795	}
796	break;
797	case 0x1d: /* fucomi */
798	break;
799	case 0x1e: /* fcomi */
800	break;
801	case 0x28: /* ffree sti */
802	break;
803	case 0x2a: /* fst sti */
804	break;
805	case 0x2b: /* fstp sti */
806	break;
807	case 0x2c: /* fucom st(i) */
808	break;
809	case 0x2d: /* fucomp st(i) */
810	break;
811	case 0x33: /* de/3 */
812	switch(rm) {
813	case 1: /* fcompp */
814	break;
815	default:
816	goto illegal_op;
817	}
818	break;
819	case 0x3c: /* df/4 */
820	switch(rm) {
821	case 0:
822	break;
823	default:
824	goto illegal_op;
825	}
826	break;
827	case 0x3d: /* fucomip */
828	break;
829	case 0x3e: /* fcomip */
830	break;
831	case 0x10 ... 0x13: /* fcmovxx */
832	case 0x18 ... 0x1b:
833	break;
834	default:
835	goto illegal_op;
836	}
837	}
838	s->tb->cflags \|= CF_TB_FP_USED;
839	break;
840
841	/**************************/
842	/* mov */
843	case 0xc6:
844	case 0xc7: /* mov Ev, Iv */
845	if ((b & 1) == 0)
846	ot = OT_BYTE;
847	else
848	ot = dflag ? OT_LONG : OT_WORD;
849	modrm = ldub_code(s->pc++);
850	parse_modrm(s, modrm);
851	insn_get(s, ot);
852	break;
853
854	case 0x8d: /* lea */
855	ot = dflag ? OT_LONG : OT_WORD;
856	modrm = ldub_code(s->pc++);
857	mod = (modrm >> 6) & 3;
858	if (mod == 3)
859	goto illegal_op;
860	parse_modrm(s, modrm);
861	break;
862
863	case 0xa0: /* mov EAX, Ov */
864	case 0xa1:
865	case 0xa2: /* mov Ov, EAX */
866	case 0xa3:
867	if ((b & 1) == 0)
868	ot = OT_BYTE;
869	else
870	ot = dflag ? OT_LONG : OT_WORD;
871	if (s->aflag)
872	insn_get(s, OT_LONG);
873	else
874	insn_get(s, OT_WORD);
875	break;
876	case 0xd7: /* xlat */
877	break;
878	case 0xb0 ... 0xb7: /* mov R, Ib */
879	insn_get(s, OT_BYTE);
880	break;
881	case 0xb8 ... 0xbf: /* mov R, Iv */
882	ot = dflag ? OT_LONG : OT_WORD;
883	insn_get(s, ot);
884	break;
885
886	case 0x91 ... 0x97: /* xchg R, EAX */
887	break;
888
889	/************************/
890	/* shifts */
891	case 0xc0:
892	case 0xc1: /* shift Ev,imm */
893
894	case 0x1a4: /* shld imm */
895	case 0x1ac: /* shrd imm */
896	modrm = ldub_code(s->pc++);
897	parse_modrm(s, modrm);
898	ldub_code(s->pc++);
899	break;
900
901	/************************/
902	/* string ops */
903
904	case 0xa4: /* movsS */
905	case 0xa5:
906	break;
907
908	case 0xaa: /* stosS */
909	case 0xab:
910	break;
911
912	case 0xac: /* lodsS */
913	case 0xad:
914	break;
915
916	case 0xae: /* scasS */
917	case 0xaf:
918	break;
919
920	case 0xa6: /* cmpsS */
921	case 0xa7:
922	break;
923
924	case 0x6c: /* insS */
925	case 0x6d:
926	goto unsupported_op;
927
928	case 0x6e: /* outsS */
929	case 0x6f:
930	goto unsupported_op;
931
932	/************************/
933	/* port I/O */
934	case 0xe4:
935	case 0xe5:
936	goto unsupported_op;
937
938	case 0xe6:
939	case 0xe7:
940	goto unsupported_op;
941
942	case 0xec:
943	case 0xed:
944	goto unsupported_op;
945
946	case 0xee:
947	case 0xef:
948	goto unsupported_op;
949
950	/************************/
951	/* control */
952	#if 0
953	case 0xc2: /* ret im */
954	val = ldsw_code(s->pc);
955	s->pc += 2;
956	gen_pop_T0(s);
957	gen_stack_update(s, val + (2 << s->dflag));
958	if (s->dflag == 0)
959	gen_op_andl_T0_ffff();
960	gen_op_jmp_T0();
961	gen_eob(s);
962	break;
963	#endif
964
965	case 0xc3: /* ret */
966	gb(s, CPU_SEG);
967	if (!s->dflag)
968	gb(s, 0x66); /* d16 */
969	gb(s, 0x8f); /* pop addr */
970	gb(s, 0x05);
971	gl(s, CPU_FIELD_OFFSET(eip));
972	if (!s->dflag) {
973	/* reset high bits of EIP */
974	gen_movw_addr_im(s, CPU_FIELD_OFFSET(eip) + 2, 0);
975	}
976	gen_eob(s);
977	goto no_copy;
978	case 0xca: /* lret im */
979	case 0xcb: /* lret */
980	case 0xcf: /* iret */
981	case 0x9a: /* lcall im */
982	case 0xea: /* ljmp im */
983	goto unsupported_op;
984
985	case 0xe8: /* call im */
986	ot = dflag ? OT_LONG : OT_WORD;
987	val = insn_get(s, ot);
988	next_eip = s->pc - s->cs_base;
989	val += next_eip;
990	if (s->dflag) {
991	gb(s, 0x68); /* pushl imm */
992	gl(s, next_eip);
993	} else {
994	gb(s, 0x66); /* pushw imm */
995	gb(s, 0x68);
996	gw(s, next_eip);
997	val &= 0xffff;
998	}
999	gen_jmp(s, val);
1000	goto no_copy;
1001	case 0xe9: /* jmp */
1002	ot = dflag ? OT_LONG : OT_WORD;
1003	val = insn_get(s, ot);
1004	val += s->pc - s->cs_base;
1005	if (s->dflag == 0)
1006	val = val & 0xffff;
1007	gen_jmp(s, val);
1008	goto no_copy;
1009	case 0xeb: /* jmp Jb */
1010	val = (int8_t)insn_get(s, OT_BYTE);
1011	val += s->pc - s->cs_base;
1012	if (s->dflag == 0)
1013	val = val & 0xffff;
1014	gen_jmp(s, val);
1015	goto no_copy;
1016	case 0x70 ... 0x7f: /* jcc Jb */
1017	val = (int8_t)insn_get(s, OT_BYTE);
1018	goto do_jcc;
1019	case 0x180 ... 0x18f: /* jcc Jv */
1020	if (dflag) {
1021	val = insn_get(s, OT_LONG);
1022	} else {
1023	val = (int16_t)insn_get(s, OT_WORD);
1024	}
1025	do_jcc:
1026	next_eip = s->pc - s->cs_base;
1027	val += next_eip;
1028	if (s->dflag == 0)
1029	val &= 0xffff;
1030	gen_jcc(s, b & 0xf, val, next_eip);
1031	goto no_copy;
1032
1033	/************************/
1034	/* flags */
1035	case 0x9c: /* pushf */
1036	/* XXX: put specific code ? */
1037	goto unsupported_op;
1038	case 0x9d: /* popf */
1039	goto unsupported_op;
1040
1041	case 0x9e: /* sahf */
1042	case 0x9f: /* lahf */
1043	case 0xf5: /* cmc */
1044	case 0xf8: /* clc */
1045	case 0xf9: /* stc */
1046	case 0xfc: /* cld */
1047	case 0xfd: /* std */
1048	break;
1049
1050	/************************/
1051	/* bit operations */
1052	case 0x1ba: /* bt/bts/btr/btc Gv, im */
1053	ot = dflag ? OT_LONG : OT_WORD;
1054	modrm = ldub_code(s->pc++);
1055	op = (modrm >> 3) & 7;
1056	parse_modrm(s, modrm);
1057	/* load shift */
1058	ldub_code(s->pc++);
1059	if (op < 4)
1060	goto illegal_op;
1061	break;
1062	/************************/
1063	/* bcd */
1064	case 0x27: /* daa */
1065	break;
1066	case 0x2f: /* das */
1067	break;
1068	case 0x37: /* aaa */
1069	break;
1070	case 0x3f: /* aas */
1071	break;
1072	case 0xd4: /* aam */
1073	ldub_code(s->pc++);
1074	break;
1075	case 0xd5: /* aad */
1076	ldub_code(s->pc++);
1077	break;
1078	/************************/
1079	/* misc */
1080	case 0x90: /* nop */
1081	break;
1082	case 0x9b: /* fwait */
1083	if ((s->flags & (HF_MP_MASK \| HF_TS_MASK)) ==
1084	(HF_MP_MASK \| HF_TS_MASK)) {
1085	goto unsupported_op;
1086	}
1087	break;
1088	case 0xcc: /* int3 */
1089	goto unsupported_op;
1090	case 0xcd: /* int N */
1091	goto unsupported_op;
1092	case 0xce: /* into */
1093	goto unsupported_op;
1094	case 0xf1: /* icebp (undocumented, exits to external debugger) */
1095	goto unsupported_op;
1096	case 0xfa: /* cli */
1097	goto unsupported_op;
1098	case 0xfb: /* sti */
1099	goto unsupported_op;
1100	case 0x62: /* bound */
1101	modrm = ldub_code(s->pc++);
1102	mod = (modrm >> 6) & 3;
1103	if (mod == 3)
1104	goto illegal_op;
1105	parse_modrm(s, modrm);
1106	break;
1107	case 0x1c8 ... 0x1cf: /* bswap reg */
1108	break;
1109	case 0xd6: /* salc */
1110	break;
1111	case 0xe0: /* loopnz */
1112	case 0xe1: /* loopz */
1113	case 0xe2: /* loop */
1114	case 0xe3: /* jecxz */
1115	goto unsupported_op;
1116
1117	case 0x130: /* wrmsr */
1118	case 0x132: /* rdmsr */
1119	goto unsupported_op;
1120	case 0x131: /* rdtsc */
1121	goto unsupported_op;
1122	case 0x1a2: /* cpuid */
1123	goto unsupported_op;
1124	case 0xf4: /* hlt */
1125	goto unsupported_op;
1126	case 0x100:
1127	goto unsupported_op;
1128	case 0x101:
1129	goto unsupported_op;
1130	case 0x108: /* invd */
1131	case 0x109: /* wbinvd */
1132	goto unsupported_op;
1133	case 0x63: /* arpl */
1134	goto unsupported_op;
1135	case 0x102: /* lar */
1136	case 0x103: /* lsl */
1137	goto unsupported_op;
1138	case 0x118:
1139	goto unsupported_op;
1140	case 0x120: /* mov reg, crN */
1141	case 0x122: /* mov crN, reg */
1142	goto unsupported_op;
1143	case 0x121: /* mov reg, drN */
1144	case 0x123: /* mov drN, reg */
1145	goto unsupported_op;
1146	case 0x106: /* clts */
1147	goto unsupported_op;
1148	default:
1149	goto illegal_op;
1150	}
1151
1152	/* just copy the code */
1153
1154	/* no override yet */
1155	if (!s->dflag)
1156	gb(s, 0x66);
1157	if (!s->aflag)
1158	gb(s, 0x67);
1159	if (prefixes & PREFIX_REPZ)
1160	gb(s, 0xf3);
1161	else if (prefixes & PREFIX_REPNZ)
1162	gb(s, 0xf2);
1163	{
1164	int len, i;
1165	len = s->pc - pc_start_insn;
1166	for(i = 0; i < len; i++) {
1167	*s->gen_code_ptr++ = ldub_code(pc_start_insn + i);
1168	}
1169	}
1170	no_copy:
1171	return 0;
1172	illegal_op:
1173	unsupported_op:
1174	/* fall back to slower code gen necessary */
1175	s->pc = pc_start;
1176	return -1;
1177	}
1178
1179	#define GEN_CODE_MAX_SIZE 8192
1180	#define GEN_CODE_MAX_INSN_SIZE 512
1181
1182	static inline int gen_intermediate_code_internal(CPUState *env,
1183	TranslationBlock *tb,
1184	uint8_t *gen_code_ptr,
1185	int *gen_code_size_ptr,
1186	int search_pc,
1187	uint8_t *tc_ptr)
1188	{
1189	DisasContext dc1, *dc = &dc1;
1190	target_ulong pc_insn, pc_start, cs_base;
1191	uint8_t *gen_code_end;
1192	int flags, ret;
1193
1194	if (env->nb_breakpoints > 0 \|\|
1195	env->singlestep_enabled)
1196	return -1;
1197	flags = tb->flags;
1198	if (flags & (HF_TF_MASK \| HF_ADDSEG_MASK \|
1199	HF_SOFTMMU_MASK \| HF_INHIBIT_IRQ_MASK))
1200	return -1;
1201	if (!(flags & HF_SS32_MASK))
1202	return -1;
1203	if (tb->cflags & CF_SINGLE_INSN)
1204	return -1;
1205	gen_code_end = gen_code_ptr +
1206	GEN_CODE_MAX_SIZE - GEN_CODE_MAX_INSN_SIZE;
1207	dc->gen_code_ptr = gen_code_ptr;
1208	dc->gen_code_start = gen_code_ptr;
1209
1210	/* generate intermediate code */
1211	pc_start = tb->pc;
1212	cs_base = tb->cs_base;
1213	dc->pc = pc_start;
1214	dc->cs_base = cs_base;
1215	dc->pe = (flags >> HF_PE_SHIFT) & 1;
1216	dc->code32 = (flags >> HF_CS32_SHIFT) & 1;
1217	dc->f_st = 0;
1218	dc->vm86 = (flags >> VM_SHIFT) & 1;
1219	dc->cpl = (flags >> HF_CPL_SHIFT) & 3;
1220	dc->iopl = (flags >> IOPL_SHIFT) & 3;
1221	dc->tb = tb;
1222	dc->flags = flags;
1223
1224	dc->is_jmp = 0;
1225
1226	for(;;) {
1227	pc_insn = dc->pc;
1228	ret = disas_insn(dc);
1229	if (ret < 0) {
1230	/* unsupported insn */
1231	if (dc->pc == pc_start) {
1232	/* if first instruction, signal that no copying was done */
1233	return -1;
1234	} else {
1235	gen_jmp(dc, dc->pc - dc->cs_base);
1236	dc->is_jmp = 1;
1237	}
1238	}
1239	if (search_pc) {
1240	/* search pc mode */
1241	if (tc_ptr < dc->gen_code_ptr) {
1242	env->eip = pc_insn - cs_base;
1243	return 0;
1244	}
1245	}
1246	/* stop translation if indicated */
1247	if (dc->is_jmp)
1248	break;
1249	/* if too long translation, stop generation */
1250	if (dc->gen_code_ptr >= gen_code_end \|\|
1251	(dc->pc - pc_start) >= (TARGET_PAGE_SIZE - 32)) {
1252	gen_jmp(dc, dc->pc - dc->cs_base);
1253	break;
1254	}
1255	}
1256
1257	#ifdef DEBUG_DISAS
1258	if (loglevel & CPU_LOG_TB_IN_ASM) {
1259	fprintf(logfile, "----------------\n");
1260	fprintf(logfile, "IN: COPY: %s fpu=%d\n",
1261	lookup_symbol(pc_start),
1262	tb->cflags & CF_TB_FP_USED ? 1 : 0);
1263	target_disas(logfile, pc_start, dc->pc - pc_start, !dc->code32);
1264	fprintf(logfile, "\n");
1265	}
1266	#endif
1267
1268	if (!search_pc) {
1269	*gen_code_size_ptr = dc->gen_code_ptr - dc->gen_code_start;
1270	tb->size = dc->pc - pc_start;
1271	tb->cflags \|= CF_CODE_COPY;
1272	return 0;
1273	} else {
1274	return -1;
1275	}
1276	}
1277
1278	/* generate code by just copying data. Return -1 if cannot generate
1279	any code. Return 0 if code was generated */
1280	int cpu_gen_code_copy(CPUState env, TranslationBlock tb,
1281	int max_code_size, int *gen_code_size_ptr)
1282	{
1283	/* generate machine code */
1284	tb->tb_next_offset[0] = 0xffff;
1285	tb->tb_next_offset[1] = 0xffff;
1286	#ifdef USE_DIRECT_JUMP
1287	/* the following two entries are optional (only used for string ops) */
1288	tb->tb_jmp_offset[2] = 0xffff;
1289	tb->tb_jmp_offset[3] = 0xffff;
1290	#endif
1291	return gen_intermediate_code_internal(env, tb,
1292	tb->tc_ptr, gen_code_size_ptr,
1293	0, NULL);
1294	}
1295
1296	static uint8_t dummy_gen_code_buf[GEN_CODE_MAX_SIZE];
1297
1298	int cpu_restore_state_copy(TranslationBlock *tb,
1299	CPUState *env, unsigned long searched_pc,
1300	void *puc)
1301	{
1302	struct ucontext *uc = puc;
1303	int ret, eflags;
1304
1305	/* find opc index corresponding to search_pc */
1306	if (searched_pc < (unsigned long)tb->tc_ptr)
1307	return -1;
1308	searched_pc = searched_pc - (long)tb->tc_ptr + (long)dummy_gen_code_buf;
1309	ret = gen_intermediate_code_internal(env, tb,
1310	dummy_gen_code_buf, NULL,
1311	1, (uint8_t *)searched_pc);
1312	if (ret < 0)
1313	return ret;
1314	/* restore all the CPU state from the CPU context from the
1315	signal. The FPU context stays in the host CPU. */
1316
1317	env->regs[R_EAX] = uc->uc_mcontext.gregs[REG_EAX];
1318	env->regs[R_ECX] = uc->uc_mcontext.gregs[REG_ECX];
1319	env->regs[R_EDX] = uc->uc_mcontext.gregs[REG_EDX];
1320	env->regs[R_EBX] = uc->uc_mcontext.gregs[REG_EBX];
1321	env->regs[R_ESP] = uc->uc_mcontext.gregs[REG_ESP];
1322	env->regs[R_EBP] = uc->uc_mcontext.gregs[REG_EBP];
1323	env->regs[R_ESI] = uc->uc_mcontext.gregs[REG_ESI];
1324	env->regs[R_EDI] = uc->uc_mcontext.gregs[REG_EDI];
1325	eflags = uc->uc_mcontext.gregs[REG_EFL];
1326	env->df = 1 - (2 * ((eflags >> 10) & 1));
1327	env->cc_src = eflags & (CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
1328	env->cc_op = CC_OP_EFLAGS;
1329	return 0;
1330	}
1331
1332	#endif /* USE_CODE_COPY */

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source: vbox/trunk/src/recompiler/target-i386/translate-copy.c@ 13480

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