cpu-exec.c@ 20537

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1	/*
2	* i386 emulator main execution loop
3	*
4	* Copyright (c) 2003-2005 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	#define CPU_NO_GLOBAL_REGS
31	#include "exec.h"
32	#include "disas.h"
33	#include "tcg.h"
34
35	#if !defined(CONFIG_SOFTMMU)
36	#undef EAX
37	#undef ECX
38	#undef EDX
39	#undef EBX
40	#undef ESP
41	#undef EBP
42	#undef ESI
43	#undef EDI
44	#undef EIP
45	#include <signal.h>
46	#include <sys/ucontext.h>
47	#endif
48
49	#if defined(__sparc__) && !defined(HOST_SOLARIS)
50	// Work around ugly bugs in glibc that mangle global register contents
51	#undef env
52	#define env cpu_single_env
53	#endif
54
55	int tb_invalidated_flag;
56
57	//#define DEBUG_EXEC
58	//#define DEBUG_SIGNAL
59
60
61	void cpu_loop_exit(void)
62	{
63	/* NOTE: the register at this point must be saved by hand because
64	longjmp restore them */
65	regs_to_env();
66	longjmp(env->jmp_env, 1);
67	}
68
69	#if !(defined(TARGET_SPARC) \|\| defined(TARGET_SH4) \|\| defined(TARGET_M68K))
70	#define reg_T2
71	#endif
72
73	/* exit the current TB from a signal handler. The host registers are
74	restored in a state compatible with the CPU emulator
75	*/
76	void cpu_resume_from_signal(CPUState env1, void puc)
77	{
78	#if !defined(CONFIG_SOFTMMU)
79	struct ucontext *uc = puc;
80	#endif
81
82	env = env1;
83
84	/* XXX: restore cpu registers saved in host registers */
85
86	#if !defined(CONFIG_SOFTMMU)
87	if (puc) {
88	/* XXX: use siglongjmp ? */
89	sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
90	}
91	#endif
92	longjmp(env->jmp_env, 1);
93	}
94
95	/* Execute the code without caching the generated code. An interpreter
96	could be used if available. */
97	static void cpu_exec_nocache(int max_cycles, TranslationBlock *orig_tb)
98	{
99	unsigned long next_tb;
100	TranslationBlock *tb;
101
102	/* Should never happen.
103	We only end up here when an existing TB is too long. */
104	if (max_cycles > CF_COUNT_MASK)
105	max_cycles = CF_COUNT_MASK;
106
107	tb = tb_gen_code(env, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
108	max_cycles);
109	env->current_tb = tb;
110	/* execute the generated code */
111	#if defined(VBOX) && defined(GCC_WITH_BUGGY_REGPARM)
112	tcg_qemu_tb_exec(tb->tc_ptr, next_tb);
113	#else
114	next_tb = tcg_qemu_tb_exec(tb->tc_ptr);
115	#endif
116
117	if ((next_tb & 3) == 2) {
118	/* Restore PC. This may happen if async event occurs before
119	the TB starts executing. */
120	CPU_PC_FROM_TB(env, tb);
121	}
122	tb_phys_invalidate(tb, -1);
123	tb_free(tb);
124	}
125
126	static TranslationBlock *tb_find_slow(target_ulong pc,
127	target_ulong cs_base,
128	uint64_t flags)
129	{
130	TranslationBlock tb, *ptb1;
131	unsigned int h;
132	target_ulong phys_pc, phys_page1, phys_page2, virt_page2;
133
134	tb_invalidated_flag = 0;
135
136	regs_to_env(); /* XXX: do it just before cpu_gen_code() */
137
138	/* find translated block using physical mappings */
139	phys_pc = get_phys_addr_code(env, pc);
140	phys_page1 = phys_pc & TARGET_PAGE_MASK;
141	phys_page2 = -1;
142	h = tb_phys_hash_func(phys_pc);
143	ptb1 = &tb_phys_hash[h];
144	for(;;) {
145	tb = *ptb1;
146	if (!tb)
147	goto not_found;
148	if (tb->pc == pc &&
149	tb->page_addr[0] == phys_page1 &&
150	tb->cs_base == cs_base &&
151	tb->flags == flags) {
152	/* check next page if needed */
153	if (tb->page_addr[1] != -1) {
154	virt_page2 = (pc & TARGET_PAGE_MASK) +
155	TARGET_PAGE_SIZE;
156	phys_page2 = get_phys_addr_code(env, virt_page2);
157	if (tb->page_addr[1] == phys_page2)
158	goto found;
159	} else {
160	goto found;
161	}
162	}
163	ptb1 = &tb->phys_hash_next;
164	}
165	not_found:
166	/* if no translated code available, then translate it now */
167	tb = tb_gen_code(env, pc, cs_base, flags, 0);
168
169	found:
170	/* we add the TB in the virtual pc hash table */
171	env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;
172	return tb;
173	}
174
175	#ifndef VBOX
176	static inline TranslationBlock *tb_find_fast(void)
177	#else
178	DECLINLINE(TranslationBlock *) tb_find_fast(void)
179	#endif
180	{
181	TranslationBlock *tb;
182	target_ulong cs_base, pc;
183	uint64_t flags;
184
185	/* we record a subset of the CPU state. It will
186	always be the same before a given translated block
187	is executed. */
188	#if defined(TARGET_I386)
189	flags = env->hflags;
190	flags \|= (env->eflags & (IOPL_MASK \| TF_MASK \| VM_MASK));
191	cs_base = env->segs[R_CS].base;
192	pc = cs_base + env->eip;
193	#elif defined(TARGET_ARM)
194	flags = env->thumb \| (env->vfp.vec_len << 1)
195	\| (env->vfp.vec_stride << 4);
196	if ((env->uncached_cpsr & CPSR_M) != ARM_CPU_MODE_USR)
197	flags \|= (1 << 6);
198	if (env->vfp.xregs[ARM_VFP_FPEXC] & (1 << 30))
199	flags \|= (1 << 7);
200	flags \|= (env->condexec_bits << 8);
201	cs_base = 0;
202	pc = env->regs[15];
203	#elif defined(TARGET_SPARC)
204	#ifdef TARGET_SPARC64
205	// AM . Combined FPU enable bits . PRIV . DMMU enabled . IMMU enabled
206	flags = ((env->pstate & PS_AM) << 2)
207	\| (((env->pstate & PS_PEF) >> 1) \| ((env->fprs & FPRS_FEF) << 2))
208	\| (env->pstate & PS_PRIV) \| ((env->lsu & (DMMU_E \| IMMU_E)) >> 2);
209	#else
210	// FPU enable . Supervisor
211	flags = (env->psref << 4) \| env->psrs;
212	#endif
213	cs_base = env->npc;
214	pc = env->pc;
215	#elif defined(TARGET_PPC)
216	flags = env->hflags;
217	cs_base = 0;
218	pc = env->nip;
219	#elif defined(TARGET_MIPS)
220	flags = env->hflags & (MIPS_HFLAG_TMASK \| MIPS_HFLAG_BMASK);
221	cs_base = 0;
222	pc = env->active_tc.PC;
223	#elif defined(TARGET_M68K)
224	flags = (env->fpcr & M68K_FPCR_PREC) /* Bit 6 */
225	\| (env->sr & SR_S) /* Bit 13 */
226	\| ((env->macsr >> 4) & 0xf); /* Bits 0-3 */
227	cs_base = 0;
228	pc = env->pc;
229	#elif defined(TARGET_SH4)
230	flags = (env->flags & (DELAY_SLOT \| DELAY_SLOT_CONDITIONAL
231	\| DELAY_SLOT_TRUE \| DELAY_SLOT_CLEARME)) /* Bits 0- 3 */
232	\| (env->fpscr & (FPSCR_FR \| FPSCR_SZ \| FPSCR_PR)) /* Bits 19-21 */
233	\| (env->sr & (SR_MD \| SR_RB)); /* Bits 29-30 */
234	cs_base = 0;
235	pc = env->pc;
236	#elif defined(TARGET_ALPHA)
237	flags = env->ps;
238	cs_base = 0;
239	pc = env->pc;
240	#elif defined(TARGET_CRIS)
241	flags = env->pregs[PR_CCS] & (S_FLAG \| P_FLAG \| U_FLAG \| X_FLAG);
242	flags \|= env->dslot;
243	cs_base = 0;
244	pc = env->pc;
245	#else
246	#error unsupported CPU
247	#endif
248	tb = env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)];
249	if (unlikely(!tb \|\| tb->pc != pc \|\| tb->cs_base != cs_base \|\|
250	tb->flags != flags)) {
251	tb = tb_find_slow(pc, cs_base, flags);
252	}
253	return tb;
254	}
255
256	/* main execution loop */
257
258	#ifdef VBOX
259
260	int cpu_exec(CPUState *env1)
261	{
262	#define DECLARE_HOST_REGS 1
263	#include "hostregs_helper.h"
264	int ret = 0, interrupt_request;
265	TranslationBlock *tb;
266	uint8_t *tc_ptr;
267	unsigned long next_tb;
268
269	cpu_single_env = env1;
270
271	/* first we save global registers */
272	#define SAVE_HOST_REGS 1
273	#include "hostregs_helper.h"
274	env = env1;
275
276	env_to_regs();
277	#if defined(TARGET_I386)
278	/* put eflags in CPU temporary format */
279	CC_SRC = env->eflags & (CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
280	DF = 1 - (2 * ((env->eflags >> 10) & 1));
281	CC_OP = CC_OP_EFLAGS;
282	env->eflags &= ~(DF_MASK \| CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
283	#elif defined(TARGET_SPARC)
284	#elif defined(TARGET_M68K)
285	env->cc_op = CC_OP_FLAGS;
286	env->cc_dest = env->sr & 0xf;
287	env->cc_x = (env->sr >> 4) & 1;
288	#elif defined(TARGET_ALPHA)
289	#elif defined(TARGET_ARM)
290	#elif defined(TARGET_PPC)
291	#elif defined(TARGET_MIPS)
292	#elif defined(TARGET_SH4)
293	#elif defined(TARGET_CRIS)
294	/* XXXXX */
295	#else
296	#error unsupported target CPU
297	#endif
298	#ifndef VBOX /* VBOX: We need to raise traps and suchlike from the outside. */
299	env->exception_index = -1;
300	#endif
301
302	/* prepare setjmp context for exception handling */
303	for(;;) {
304	if (setjmp(env->jmp_env) == 0)
305	{
306	env->current_tb = NULL;
307
308	/*
309	* Check for fatal errors first
310	*/
311	if (env->interrupt_request & CPU_INTERRUPT_RC) {
312	env->exception_index = EXCP_RC;
313	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_RC);
314	ret = env->exception_index;
315	cpu_loop_exit();
316	}
317
318	/* if an exception is pending, we execute it here */
319	if (env->exception_index >= 0) {
320	Assert(!env->user_mode_only);
321	if (env->exception_index >= EXCP_INTERRUPT) {
322	/* exit request from the cpu execution loop */
323	ret = env->exception_index;
324	break;
325	} else {
326	/* simulate a real cpu exception. On i386, it can
327	trigger new exceptions, but we do not handle
328	double or triple faults yet. */
329	RAWEx_ProfileStart(env, STATS_IRQ_HANDLING);
330	Log(("do_interrupt %d %d %RGv\n", env->exception_index, env->exception_is_int, env->exception_next_eip));
331	do_interrupt(env->exception_index,
332	env->exception_is_int,
333	env->error_code,
334	env->exception_next_eip, 0);
335	/* successfully delivered */
336	env->old_exception = -1;
337	RAWEx_ProfileStop(env, STATS_IRQ_HANDLING);
338	}
339	env->exception_index = -1;
340	}
341
342	next_tb = 0; /* force lookup of first TB */
343	for(;;)
344	{
345	interrupt_request = env->interrupt_request;
346	#ifndef VBOX
347	if (__builtin_expect(interrupt_request, 0))
348	#else
349	if (RT_UNLIKELY(interrupt_request != 0))
350	#endif
351	{
352	/** @todo: reconscille with what QEMU really does */
353
354	/* Single instruction exec request, we execute it and return (one way or the other).
355	The caller will always reschedule after doing this operation! */
356	if (interrupt_request & CPU_INTERRUPT_SINGLE_INSTR)
357	{
358	/* not in flight are we? (if we are, we trapped) */
359	if (!(env->interrupt_request & CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT))
360	{
361	ASMAtomicOrS32((int32_t volatile *)&env->interrupt_request, CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT);
362	env->exception_index = EXCP_SINGLE_INSTR;
363	if (emulate_single_instr(env) == -1)
364	AssertMsgFailed(("REM: emulate_single_instr failed for EIP=%RGv!!\n", env->eip));
365
366	/* When we receive an external interrupt during execution of this single
367	instruction, then we should stay here. We will leave when we're ready
368	for raw-mode or when interrupted by pending EMT requests. */
369	interrupt_request = env->interrupt_request; /* reload this! */
370	if ( !(interrupt_request & CPU_INTERRUPT_HARD)
371	\|\| !(env->eflags & IF_MASK)
372	\|\| (env->hflags & HF_INHIBIT_IRQ_MASK)
373	\|\| (env->state & CPU_RAW_HWACC)
374	)
375	{
376	env->exception_index = ret = EXCP_SINGLE_INSTR;
377	cpu_loop_exit();
378	}
379	}
380	/* Clear CPU_INTERRUPT_SINGLE_INSTR and leave CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT set. */
381	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_SINGLE_INSTR);
382	}
383
384	RAWEx_ProfileStart(env, STATS_IRQ_HANDLING);
385	if ((interrupt_request & CPU_INTERRUPT_SMI) &&
386	!(env->hflags & HF_SMM_MASK)) {
387	env->interrupt_request &= ~CPU_INTERRUPT_SMI;
388	do_smm_enter();
389	next_tb = 0;
390	}
391	else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
392	(env->eflags & IF_MASK) &&
393	!(env->hflags & HF_INHIBIT_IRQ_MASK))
394	{
395	/* if hardware interrupt pending, we execute it */
396	int intno;
397	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_HARD);
398	intno = cpu_get_pic_interrupt(env);
399	if (intno >= 0)
400	{
401	Log(("do_interrupt %d\n", intno));
402	do_interrupt(intno, 0, 0, 0, 1);
403	}
404	/* ensure that no TB jump will be modified as
405	the program flow was changed */
406	next_tb = 0;
407	}
408	if (env->interrupt_request & CPU_INTERRUPT_EXITTB)
409	{
410	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_EXITTB);
411	/* ensure that no TB jump will be modified as
412	the program flow was changed */
413	next_tb = 0;
414	}
415	RAWEx_ProfileStop(env, STATS_IRQ_HANDLING);
416	if (interrupt_request & CPU_INTERRUPT_EXIT)
417	{
418	env->exception_index = EXCP_INTERRUPT;
419	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_EXIT);
420	ret = env->exception_index;
421	cpu_loop_exit();
422	}
423	if (interrupt_request & CPU_INTERRUPT_RC)
424	{
425	env->exception_index = EXCP_RC;
426	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_RC);
427	ret = env->exception_index;
428	cpu_loop_exit();
429	}
430	}
431
432	/*
433	* Check if we the CPU state allows us to execute the code in raw-mode.
434	*/
435	RAWEx_ProfileStart(env, STATS_RAW_CHECK);
436	if (remR3CanExecuteRaw(env,
437	env->eip + env->segs[R_CS].base,
438	env->hflags \| (env->eflags & (IOPL_MASK \| TF_MASK \| VM_MASK)),
439	&env->exception_index))
440	{
441	RAWEx_ProfileStop(env, STATS_RAW_CHECK);
442	ret = env->exception_index;
443	cpu_loop_exit();
444	}
445	RAWEx_ProfileStop(env, STATS_RAW_CHECK);
446
447	RAWEx_ProfileStart(env, STATS_TLB_LOOKUP);
448	spin_lock(&tb_lock);
449	tb = tb_find_fast();
450	/* Note: we do it here to avoid a gcc bug on Mac OS X when
451	doing it in tb_find_slow */
452	if (tb_invalidated_flag) {
453	/* as some TB could have been invalidated because
454	of memory exceptions while generating the code, we
455	must recompute the hash index here */
456	next_tb = 0;
457	tb_invalidated_flag = 0;
458	}
459
460	/* see if we can patch the calling TB. When the TB
461	spans two pages, we cannot safely do a direct
462	jump. */
463	if (next_tb != 0
464	&& !(tb->cflags & CF_RAW_MODE)
465	&& tb->page_addr[1] == -1)
466	{
467	tb_add_jump((TranslationBlock *)(long)(next_tb & ~3), next_tb & 3, tb);
468	}
469	spin_unlock(&tb_lock);
470	RAWEx_ProfileStop(env, STATS_TLB_LOOKUP);
471
472	env->current_tb = tb;
473	while (env->current_tb) {
474	tc_ptr = tb->tc_ptr;
475	/* execute the generated code */
476	RAWEx_ProfileStart(env, STATS_QEMU_RUN_EMULATED_CODE);
477	#if defined(VBOX) && defined(GCC_WITH_BUGGY_REGPARM)
478	tcg_qemu_tb_exec(tc_ptr, next_tb);
479	#else
480	next_tb = tcg_qemu_tb_exec(tc_ptr);
481	#endif
482	RAWEx_ProfileStop(env, STATS_QEMU_RUN_EMULATED_CODE);
483	env->current_tb = NULL;
484	if ((next_tb & 3) == 2) {
485	/* Instruction counter expired. */
486	int insns_left;
487	tb = (TranslationBlock *)(long)(next_tb & ~3);
488	/* Restore PC. */
489	CPU_PC_FROM_TB(env, tb);
490	insns_left = env->icount_decr.u32;
491	if (env->icount_extra && insns_left >= 0) {
492	/* Refill decrementer and continue execution. */
493	env->icount_extra += insns_left;
494	if (env->icount_extra > 0xffff) {
495	insns_left = 0xffff;
496	} else {
497	insns_left = env->icount_extra;
498	}
499	env->icount_extra -= insns_left;
500	env->icount_decr.u16.low = insns_left;
501	} else {
502	if (insns_left > 0) {
503	/* Execute remaining instructions. */
504	cpu_exec_nocache(insns_left, tb);
505	}
506	env->exception_index = EXCP_INTERRUPT;
507	next_tb = 0;
508	cpu_loop_exit();
509	}
510	}
511	}
512
513	/* reset soft MMU for next block (it can currently
514	only be set by a memory fault) */
515	#if defined(TARGET_I386) && !defined(CONFIG_SOFTMMU)
516	if (env->hflags & HF_SOFTMMU_MASK) {
517	env->hflags &= ~HF_SOFTMMU_MASK;
518	/* do not allow linking to another block */
519	next_tb = 0;
520	}
521	#endif
522	} /* for(;;) */
523	} else {
524	env_to_regs();
525	}
526	#ifdef VBOX_HIGH_RES_TIMERS_HACK
527	/* NULL the current_tb here so cpu_interrupt() doesn't do anything
528	unnecessary (like crashing during emulate single instruction).
529	Note! Don't use env1->pVM here, the code wouldn't run with
530	gcc-4.4/amd64 anymore, see #3883. */
531	env->current_tb = NULL;
532	if ( !(env->interrupt_request & ( CPU_INTERRUPT_EXIT \| CPU_INTERRUPT_DEBUG \| CPU_INTERRUPT_EXTERNAL_EXIT \| CPU_INTERRUPT_RC
533	\| CPU_INTERRUPT_SINGLE_INSTR \| CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT))
534	&& ( (env->interrupt_request & CPU_INTERRUPT_EXTERNAL_TIMER)
535	\|\| TMTimerPollBool(env->pVM, env->pVCpu)) ) {
536	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_EXTERNAL_TIMER);
537	remR3ProfileStart(STATS_QEMU_RUN_TIMERS);
538	TMR3TimerQueuesDo(env->pVM);
539	remR3ProfileStop(STATS_QEMU_RUN_TIMERS);
540	}
541	#endif
542	} /* for(;;) */
543
544	#if defined(TARGET_I386)
545	/* restore flags in standard format */
546	env->eflags = env->eflags \| cc_table[CC_OP].compute_all() \| (DF & DF_MASK);
547	#else
548	#error unsupported target CPU
549	#endif
550	#include "hostregs_helper.h"
551	return ret;
552	}
553
554	#else /* !VBOX */
555	int cpu_exec(CPUState *env1)
556	{
557	#define DECLARE_HOST_REGS 1
558	#include "hostregs_helper.h"
559	int ret, interrupt_request;
560	TranslationBlock *tb;
561	uint8_t *tc_ptr;
562	unsigned long next_tb;
563
564	if (cpu_halted(env1) == EXCP_HALTED)
565	return EXCP_HALTED;
566
567	cpu_single_env = env1;
568
569	/* first we save global registers */
570	#define SAVE_HOST_REGS 1
571	#include "hostregs_helper.h"
572	env = env1;
573
574	env_to_regs();
575	#if defined(TARGET_I386)
576	/* put eflags in CPU temporary format */
577	CC_SRC = env->eflags & (CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
578	DF = 1 - (2 * ((env->eflags >> 10) & 1));
579	CC_OP = CC_OP_EFLAGS;
580	env->eflags &= ~(DF_MASK \| CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
581	#elif defined(TARGET_SPARC)
582	#elif defined(TARGET_M68K)
583	env->cc_op = CC_OP_FLAGS;
584	env->cc_dest = env->sr & 0xf;
585	env->cc_x = (env->sr >> 4) & 1;
586	#elif defined(TARGET_ALPHA)
587	#elif defined(TARGET_ARM)
588	#elif defined(TARGET_PPC)
589	#elif defined(TARGET_MIPS)
590	#elif defined(TARGET_SH4)
591	#elif defined(TARGET_CRIS)
592	/* XXXXX */
593	#else
594	#error unsupported target CPU
595	#endif
596	env->exception_index = -1;
597
598	/* prepare setjmp context for exception handling */
599	for(;;) {
600	if (setjmp(env->jmp_env) == 0) {
601	env->current_tb = NULL;
602	/* if an exception is pending, we execute it here */
603	if (env->exception_index >= 0) {
604	if (env->exception_index >= EXCP_INTERRUPT) {
605	/* exit request from the cpu execution loop */
606	ret = env->exception_index;
607	break;
608	} else if (env->user_mode_only) {
609	/* if user mode only, we simulate a fake exception
610	which will be handled outside the cpu execution
611	loop */
612	#if defined(TARGET_I386)
613	do_interrupt_user(env->exception_index,
614	env->exception_is_int,
615	env->error_code,
616	env->exception_next_eip);
617	/* successfully delivered */
618	env->old_exception = -1;
619	#endif
620	ret = env->exception_index;
621	break;
622	} else {
623	#if defined(TARGET_I386)
624	/* simulate a real cpu exception. On i386, it can
625	trigger new exceptions, but we do not handle
626	double or triple faults yet. */
627	do_interrupt(env->exception_index,
628	env->exception_is_int,
629	env->error_code,
630	env->exception_next_eip, 0);
631	/* successfully delivered */
632	env->old_exception = -1;
633	#elif defined(TARGET_PPC)
634	do_interrupt(env);
635	#elif defined(TARGET_MIPS)
636	do_interrupt(env);
637	#elif defined(TARGET_SPARC)
638	do_interrupt(env);
639	#elif defined(TARGET_ARM)
640	do_interrupt(env);
641	#elif defined(TARGET_SH4)
642	do_interrupt(env);
643	#elif defined(TARGET_ALPHA)
644	do_interrupt(env);
645	#elif defined(TARGET_CRIS)
646	do_interrupt(env);
647	#elif defined(TARGET_M68K)
648	do_interrupt(0);
649	#endif
650	}
651	env->exception_index = -1;
652	}
653	#ifdef USE_KQEMU
654	if (kqemu_is_ok(env) && env->interrupt_request == 0) {
655	int ret;
656	env->eflags = env->eflags \| cc_table[CC_OP].compute_all() \| (DF & DF_MASK);
657	ret = kqemu_cpu_exec(env);
658	/* put eflags in CPU temporary format */
659	CC_SRC = env->eflags & (CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
660	DF = 1 - (2 * ((env->eflags >> 10) & 1));
661	CC_OP = CC_OP_EFLAGS;
662	env->eflags &= ~(DF_MASK \| CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
663	if (ret == 1) {
664	/* exception */
665	longjmp(env->jmp_env, 1);
666	} else if (ret == 2) {
667	/* softmmu execution needed */
668	} else {
669	if (env->interrupt_request != 0) {
670	/* hardware interrupt will be executed just after */
671	} else {
672	/* otherwise, we restart */
673	longjmp(env->jmp_env, 1);
674	}
675	}
676	}
677	#endif
678
679	next_tb = 0; /* force lookup of first TB */
680	for(;;) {
681	interrupt_request = env->interrupt_request;
682	if (unlikely(interrupt_request) &&
683	likely(!(env->singlestep_enabled & SSTEP_NOIRQ))) {
684	if (interrupt_request & CPU_INTERRUPT_DEBUG) {
685	env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
686	env->exception_index = EXCP_DEBUG;
687	cpu_loop_exit();
688	}
689	#if defined(TARGET_ARM) \|\| defined(TARGET_SPARC) \|\| defined(TARGET_MIPS) \|\| \
690	defined(TARGET_PPC) \|\| defined(TARGET_ALPHA) \|\| defined(TARGET_CRIS)
691	if (interrupt_request & CPU_INTERRUPT_HALT) {
692	env->interrupt_request &= ~CPU_INTERRUPT_HALT;
693	env->halted = 1;
694	env->exception_index = EXCP_HLT;
695	cpu_loop_exit();
696	}
697	#endif
698	#if defined(TARGET_I386)
699	if (env->hflags2 & HF2_GIF_MASK) {
700	if ((interrupt_request & CPU_INTERRUPT_SMI) &&
701	!(env->hflags & HF_SMM_MASK)) {
702	svm_check_intercept(SVM_EXIT_SMI);
703	env->interrupt_request &= ~CPU_INTERRUPT_SMI;
704	do_smm_enter();
705	next_tb = 0;
706	} else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
707	!(env->hflags2 & HF2_NMI_MASK)) {
708	env->interrupt_request &= ~CPU_INTERRUPT_NMI;
709	env->hflags2 \|= HF2_NMI_MASK;
710	do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
711	next_tb = 0;
712	} else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
713	(((env->hflags2 & HF2_VINTR_MASK) &&
714	(env->hflags2 & HF2_HIF_MASK)) \|\|
715	(!(env->hflags2 & HF2_VINTR_MASK) &&
716	(env->eflags & IF_MASK &&
717	!(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
718	int intno;
719	svm_check_intercept(SVM_EXIT_INTR);
720	env->interrupt_request &= ~(CPU_INTERRUPT_HARD \| CPU_INTERRUPT_VIRQ);
721	intno = cpu_get_pic_interrupt(env);
722	if (loglevel & CPU_LOG_TB_IN_ASM) {
723	fprintf(logfile, "Servicing hardware INT=0x%02x\n", intno);
724	}
725	do_interrupt(intno, 0, 0, 0, 1);
726	/* ensure that no TB jump will be modified as
727	the program flow was changed */
728	next_tb = 0;
729	#if !defined(CONFIG_USER_ONLY)
730	} else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
731	(env->eflags & IF_MASK) &&
732	!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
733	int intno;
734	/* FIXME: this should respect TPR */
735	svm_check_intercept(SVM_EXIT_VINTR);
736	env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
737	intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
738	if (loglevel & CPU_LOG_TB_IN_ASM)
739	fprintf(logfile, "Servicing virtual hardware INT=0x%02x\n", intno);
740	do_interrupt(intno, 0, 0, 0, 1);
741	next_tb = 0;
742	#endif
743	}
744	}
745	#elif defined(TARGET_PPC)
746	#if 0
747	if ((interrupt_request & CPU_INTERRUPT_RESET)) {
748	cpu_ppc_reset(env);
749	}
750	#endif
751	if (interrupt_request & CPU_INTERRUPT_HARD) {
752	ppc_hw_interrupt(env);
753	if (env->pending_interrupts == 0)
754	env->interrupt_request &= ~CPU_INTERRUPT_HARD;
755	next_tb = 0;
756	}
757	#elif defined(TARGET_MIPS)
758	if ((interrupt_request & CPU_INTERRUPT_HARD) &&
759	(env->CP0_Status & env->CP0_Cause & CP0Ca_IP_mask) &&
760	(env->CP0_Status & (1 << CP0St_IE)) &&
761	!(env->CP0_Status & (1 << CP0St_EXL)) &&
762	!(env->CP0_Status & (1 << CP0St_ERL)) &&
763	!(env->hflags & MIPS_HFLAG_DM)) {
764	/* Raise it */
765	env->exception_index = EXCP_EXT_INTERRUPT;
766	env->error_code = 0;
767	do_interrupt(env);
768	next_tb = 0;
769	}
770	#elif defined(TARGET_SPARC)
771	if ((interrupt_request & CPU_INTERRUPT_HARD) &&
772	(env->psret != 0)) {
773	int pil = env->interrupt_index & 15;
774	int type = env->interrupt_index & 0xf0;
775
776	if (((type == TT_EXTINT) &&
777	(pil == 15 \|\| pil > env->psrpil)) \|\|
778	type != TT_EXTINT) {
779	env->interrupt_request &= ~CPU_INTERRUPT_HARD;
780	env->exception_index = env->interrupt_index;
781	do_interrupt(env);
782	env->interrupt_index = 0;
783	#if !defined(TARGET_SPARC64) && !defined(CONFIG_USER_ONLY)
784	cpu_check_irqs(env);
785	#endif
786	next_tb = 0;
787	}
788	} else if (interrupt_request & CPU_INTERRUPT_TIMER) {
789	//do_interrupt(0, 0, 0, 0, 0);
790	env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
791	}
792	#elif defined(TARGET_ARM)
793	if (interrupt_request & CPU_INTERRUPT_FIQ
794	&& !(env->uncached_cpsr & CPSR_F)) {
795	env->exception_index = EXCP_FIQ;
796	do_interrupt(env);
797	next_tb = 0;
798	}
799	/* ARMv7-M interrupt return works by loading a magic value
800	into the PC. On real hardware the load causes the
801	return to occur. The qemu implementation performs the
802	jump normally, then does the exception return when the
803	CPU tries to execute code at the magic address.
804	This will cause the magic PC value to be pushed to
805	the stack if an interrupt occured at the wrong time.
806	We avoid this by disabling interrupts when
807	pc contains a magic address. */
808	if (interrupt_request & CPU_INTERRUPT_HARD
809	&& ((IS_M(env) && env->regs[15] < 0xfffffff0)
810	\|\| !(env->uncached_cpsr & CPSR_I))) {
811	env->exception_index = EXCP_IRQ;
812	do_interrupt(env);
813	next_tb = 0;
814	}
815	#elif defined(TARGET_SH4)
816	if (interrupt_request & CPU_INTERRUPT_HARD) {
817	do_interrupt(env);
818	next_tb = 0;
819	}
820	#elif defined(TARGET_ALPHA)
821	if (interrupt_request & CPU_INTERRUPT_HARD) {
822	do_interrupt(env);
823	next_tb = 0;
824	}
825	#elif defined(TARGET_CRIS)
826	if (interrupt_request & CPU_INTERRUPT_HARD
827	&& (env->pregs[PR_CCS] & I_FLAG)) {
828	env->exception_index = EXCP_IRQ;
829	do_interrupt(env);
830	next_tb = 0;
831	}
832	if (interrupt_request & CPU_INTERRUPT_NMI
833	&& (env->pregs[PR_CCS] & M_FLAG)) {
834	env->exception_index = EXCP_NMI;
835	do_interrupt(env);
836	next_tb = 0;
837	}
838	#elif defined(TARGET_M68K)
839	if (interrupt_request & CPU_INTERRUPT_HARD
840	&& ((env->sr & SR_I) >> SR_I_SHIFT)
841	< env->pending_level) {
842	/* Real hardware gets the interrupt vector via an
843	IACK cycle at this point. Current emulated
844	hardware doesn't rely on this, so we
845	provide/save the vector when the interrupt is
846	first signalled. */
847	env->exception_index = env->pending_vector;
848	do_interrupt(1);
849	next_tb = 0;
850	}
851	#endif
852	/* Don't use the cached interupt_request value,
853	do_interrupt may have updated the EXITTB flag. */
854	if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
855	env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
856	/* ensure that no TB jump will be modified as
857	the program flow was changed */
858	next_tb = 0;
859	}
860	if (interrupt_request & CPU_INTERRUPT_EXIT) {
861	env->interrupt_request &= ~CPU_INTERRUPT_EXIT;
862	env->exception_index = EXCP_INTERRUPT;
863	cpu_loop_exit();
864	}
865	}
866	#ifdef DEBUG_EXEC
867	if ((loglevel & CPU_LOG_TB_CPU)) {
868	/* restore flags in standard format */
869	regs_to_env();
870	#if defined(TARGET_I386)
871	env->eflags = env->eflags \| cc_table[CC_OP].compute_all() \| (DF & DF_MASK);
872	cpu_dump_state(env, logfile, fprintf, X86_DUMP_CCOP);
873	env->eflags &= ~(DF_MASK \| CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
874	#elif defined(TARGET_ARM)
875	cpu_dump_state(env, logfile, fprintf, 0);
876	#elif defined(TARGET_SPARC)
877	cpu_dump_state(env, logfile, fprintf, 0);
878	#elif defined(TARGET_PPC)
879	cpu_dump_state(env, logfile, fprintf, 0);
880	#elif defined(TARGET_M68K)
881	cpu_m68k_flush_flags(env, env->cc_op);
882	env->cc_op = CC_OP_FLAGS;
883	env->sr = (env->sr & 0xffe0)
884	\| env->cc_dest \| (env->cc_x << 4);
885	cpu_dump_state(env, logfile, fprintf, 0);
886	#elif defined(TARGET_MIPS)
887	cpu_dump_state(env, logfile, fprintf, 0);
888	#elif defined(TARGET_SH4)
889	cpu_dump_state(env, logfile, fprintf, 0);
890	#elif defined(TARGET_ALPHA)
891	cpu_dump_state(env, logfile, fprintf, 0);
892	#elif defined(TARGET_CRIS)
893	cpu_dump_state(env, logfile, fprintf, 0);
894	#else
895	#error unsupported target CPU
896	#endif
897	}
898	#endif
899	spin_lock(&tb_lock);
900	tb = tb_find_fast();
901	/* Note: we do it here to avoid a gcc bug on Mac OS X when
902	doing it in tb_find_slow */
903	if (tb_invalidated_flag) {
904	/* as some TB could have been invalidated because
905	of memory exceptions while generating the code, we
906	must recompute the hash index here */
907	next_tb = 0;
908	tb_invalidated_flag = 0;
909	}
910	#ifdef DEBUG_EXEC
911	if ((loglevel & CPU_LOG_EXEC)) {
912	fprintf(logfile, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n",
913	(long)tb->tc_ptr, tb->pc,
914	lookup_symbol(tb->pc));
915	}
916	#endif
917	/* see if we can patch the calling TB. When the TB
918	spans two pages, we cannot safely do a direct
919	jump. */
920	{
921	if (next_tb != 0 &&
922	#ifdef USE_KQEMU
923	(env->kqemu_enabled != 2) &&
924	#endif
925	tb->page_addr[1] == -1) {
926	tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
927	}
928	}
929	spin_unlock(&tb_lock);
930	env->current_tb = tb;
931	while (env->current_tb) {
932	tc_ptr = tb->tc_ptr;
933	/* execute the generated code */
934	#if defined(__sparc__) && !defined(HOST_SOLARIS)
935	#undef env
936	env = cpu_single_env;
937	#define env cpu_single_env
938	#endif
939	next_tb = tcg_qemu_tb_exec(tc_ptr);
940	env->current_tb = NULL;
941	if ((next_tb & 3) == 2) {
942	/* Instruction counter expired. */
943	int insns_left;
944	tb = (TranslationBlock *)(long)(next_tb & ~3);
945	/* Restore PC. */
946	CPU_PC_FROM_TB(env, tb);
947	insns_left = env->icount_decr.u32;
948	if (env->icount_extra && insns_left >= 0) {
949	/* Refill decrementer and continue execution. */
950	env->icount_extra += insns_left;
951	if (env->icount_extra > 0xffff) {
952	insns_left = 0xffff;
953	} else {
954	insns_left = env->icount_extra;
955	}
956	env->icount_extra -= insns_left;
957	env->icount_decr.u16.low = insns_left;
958	} else {
959	if (insns_left > 0) {
960	/* Execute remaining instructions. */
961	cpu_exec_nocache(insns_left, tb);
962	}
963	env->exception_index = EXCP_INTERRUPT;
964	next_tb = 0;
965	cpu_loop_exit();
966	}
967	}
968	}
969	/* reset soft MMU for next block (it can currently
970	only be set by a memory fault) */
971	#if defined(USE_KQEMU)
972	#define MIN_CYCLE_BEFORE_SWITCH (100 * 1000)
973	if (kqemu_is_ok(env) &&
974	(cpu_get_time_fast() - env->last_io_time) >= MIN_CYCLE_BEFORE_SWITCH) {
975	cpu_loop_exit();
976	}
977	#endif
978	} /* for(;;) */
979	} else {
980	env_to_regs();
981	}
982	} /* for(;;) */
983
984
985	#if defined(TARGET_I386)
986	/* restore flags in standard format */
987	env->eflags = env->eflags \| cc_table[CC_OP].compute_all() \| (DF & DF_MASK);
988	#elif defined(TARGET_ARM)
989	/* XXX: Save/restore host fpu exception state?. */
990	#elif defined(TARGET_SPARC)
991	#elif defined(TARGET_PPC)
992	#elif defined(TARGET_M68K)
993	cpu_m68k_flush_flags(env, env->cc_op);
994	env->cc_op = CC_OP_FLAGS;
995	env->sr = (env->sr & 0xffe0)
996	\| env->cc_dest \| (env->cc_x << 4);
997	#elif defined(TARGET_MIPS)
998	#elif defined(TARGET_SH4)
999	#elif defined(TARGET_ALPHA)
1000	#elif defined(TARGET_CRIS)
1001	/* XXXXX */
1002	#else
1003	#error unsupported target CPU
1004	#endif
1005
1006	/* restore global registers */
1007	#include "hostregs_helper.h"
1008
1009	/* fail safe : never use cpu_single_env outside cpu_exec() */
1010	cpu_single_env = NULL;
1011	return ret;
1012	}
1013	#endif /* !VBOX */
1014
1015	/* must only be called from the generated code as an exception can be
1016	generated */
1017	void tb_invalidate_page_range(target_ulong start, target_ulong end)
1018	{
1019	/* XXX: cannot enable it yet because it yields to MMU exception
1020	where NIP != read address on PowerPC */
1021	#if 0
1022	target_ulong phys_addr;
1023	phys_addr = get_phys_addr_code(env, start);
1024	tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
1025	#endif
1026	}
1027
1028	#if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
1029
1030	void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
1031	{
1032	CPUX86State *saved_env;
1033
1034	saved_env = env;
1035	env = s;
1036	if (!(env->cr[0] & CR0_PE_MASK) \|\| (env->eflags & VM_MASK)) {
1037	selector &= 0xffff;
1038	cpu_x86_load_seg_cache(env, seg_reg, selector,
1039	(selector << 4), 0xffff, 0);
1040	} else {
1041	load_seg(seg_reg, selector);
1042	}
1043	env = saved_env;
1044	}
1045
1046	void cpu_x86_fsave(CPUX86State s, uint8_t ptr, int data32)
1047	{
1048	CPUX86State *saved_env;
1049
1050	saved_env = env;
1051	env = s;
1052
1053	helper_fsave((target_ulong)ptr, data32);
1054
1055	env = saved_env;
1056	}
1057
1058	void cpu_x86_frstor(CPUX86State s, uint8_t ptr, int data32)
1059	{
1060	CPUX86State *saved_env;
1061
1062	saved_env = env;
1063	env = s;
1064
1065	helper_frstor((target_ulong)ptr, data32);
1066
1067	env = saved_env;
1068	}
1069
1070	#endif /* TARGET_I386 */
1071
1072	#if !defined(CONFIG_SOFTMMU)
1073
1074	#if defined(TARGET_I386)
1075
1076	/* 'pc' is the host PC at which the exception was raised. 'address' is
1077	the effective address of the memory exception. 'is_write' is 1 if a
1078	write caused the exception and otherwise 0'. 'old_set' is the
1079	signal set which should be restored */
1080	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
1081	int is_write, sigset_t *old_set,
1082	void *puc)
1083	{
1084	TranslationBlock *tb;
1085	int ret;
1086
1087	if (cpu_single_env)
1088	env = cpu_single_env; /* XXX: find a correct solution for multithread */
1089	#if defined(DEBUG_SIGNAL)
1090	qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
1091	pc, address, is_write, (unsigned long )old_set);
1092	#endif
1093	/* XXX: locking issue */
1094	if (is_write && page_unprotect(h2g(address), pc, puc)) {
1095	return 1;
1096	}
1097
1098	/* see if it is an MMU fault */
1099	ret = cpu_x86_handle_mmu_fault(env, address, is_write,
1100	((env->hflags & HF_CPL_MASK) == 3), 0);
1101	if (ret < 0)
1102	return 0; /* not an MMU fault */
1103	if (ret == 0)
1104	return 1; /* the MMU fault was handled without causing real CPU fault */
1105	/* now we have a real cpu fault */
1106	tb = tb_find_pc(pc);
1107	if (tb) {
1108	/* the PC is inside the translated code. It means that we have
1109	a virtual CPU fault */
1110	cpu_restore_state(tb, env, pc, puc);
1111	}
1112	if (ret == 1) {
1113	#if 0
1114	printf("PF exception: EIP=0x%RGv CR2=0x%RGv error=0x%x\n",
1115	env->eip, env->cr[2], env->error_code);
1116	#endif
1117	/* we restore the process signal mask as the sigreturn should
1118	do it (XXX: use sigsetjmp) */
1119	sigprocmask(SIG_SETMASK, old_set, NULL);
1120	raise_exception_err(env->exception_index, env->error_code);
1121	} else {
1122	/* activate soft MMU for this block */
1123	env->hflags \|= HF_SOFTMMU_MASK;
1124	cpu_resume_from_signal(env, puc);
1125	}
1126	/* never comes here */
1127	return 1;
1128	}
1129
1130	#elif defined(TARGET_ARM)
1131	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
1132	int is_write, sigset_t *old_set,
1133	void *puc)
1134	{
1135	TranslationBlock *tb;
1136	int ret;
1137
1138	if (cpu_single_env)
1139	env = cpu_single_env; /* XXX: find a correct solution for multithread */
1140	#if defined(DEBUG_SIGNAL)
1141	printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
1142	pc, address, is_write, (unsigned long )old_set);
1143	#endif
1144	/* XXX: locking issue */
1145	if (is_write && page_unprotect(h2g(address), pc, puc)) {
1146	return 1;
1147	}
1148	/* see if it is an MMU fault */
1149	ret = cpu_arm_handle_mmu_fault(env, address, is_write, 1, 0);
1150	if (ret < 0)
1151	return 0; /* not an MMU fault */
1152	if (ret == 0)
1153	return 1; /* the MMU fault was handled without causing real CPU fault */
1154	/* now we have a real cpu fault */
1155	tb = tb_find_pc(pc);
1156	if (tb) {
1157	/* the PC is inside the translated code. It means that we have
1158	a virtual CPU fault */
1159	cpu_restore_state(tb, env, pc, puc);
1160	}
1161	/* we restore the process signal mask as the sigreturn should
1162	do it (XXX: use sigsetjmp) */
1163	sigprocmask(SIG_SETMASK, old_set, NULL);
1164	cpu_loop_exit();
1165	}
1166	#elif defined(TARGET_SPARC)
1167	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
1168	int is_write, sigset_t *old_set,
1169	void *puc)
1170	{
1171	TranslationBlock *tb;
1172	int ret;
1173
1174	if (cpu_single_env)
1175	env = cpu_single_env; /* XXX: find a correct solution for multithread */
1176	#if defined(DEBUG_SIGNAL)
1177	printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
1178	pc, address, is_write, (unsigned long )old_set);
1179	#endif
1180	/* XXX: locking issue */
1181	if (is_write && page_unprotect(h2g(address), pc, puc)) {
1182	return 1;
1183	}
1184	/* see if it is an MMU fault */
1185	ret = cpu_sparc_handle_mmu_fault(env, address, is_write, 1, 0);
1186	if (ret < 0)
1187	return 0; /* not an MMU fault */
1188	if (ret == 0)
1189	return 1; /* the MMU fault was handled without causing real CPU fault */
1190	/* now we have a real cpu fault */
1191	tb = tb_find_pc(pc);
1192	if (tb) {
1193	/* the PC is inside the translated code. It means that we have
1194	a virtual CPU fault */
1195	cpu_restore_state(tb, env, pc, puc);
1196	}
1197	/* we restore the process signal mask as the sigreturn should
1198	do it (XXX: use sigsetjmp) */
1199	sigprocmask(SIG_SETMASK, old_set, NULL);
1200	cpu_loop_exit();
1201	}
1202	#elif defined (TARGET_PPC)
1203	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
1204	int is_write, sigset_t *old_set,
1205	void *puc)
1206	{
1207	TranslationBlock *tb;
1208	int ret;
1209
1210	if (cpu_single_env)
1211	env = cpu_single_env; /* XXX: find a correct solution for multithread */
1212	#if defined(DEBUG_SIGNAL)
1213	printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
1214	pc, address, is_write, (unsigned long )old_set);
1215	#endif
1216	/* XXX: locking issue */
1217	if (is_write && page_unprotect(h2g(address), pc, puc)) {
1218	return 1;
1219	}
1220
1221	/* see if it is an MMU fault */
1222	ret = cpu_ppc_handle_mmu_fault(env, address, is_write, msr_pr, 0);
1223	if (ret < 0)
1224	return 0; /* not an MMU fault */
1225	if (ret == 0)
1226	return 1; /* the MMU fault was handled without causing real CPU fault */
1227
1228	/* now we have a real cpu fault */
1229	tb = tb_find_pc(pc);
1230	if (tb) {
1231	/* the PC is inside the translated code. It means that we have
1232	a virtual CPU fault */
1233	cpu_restore_state(tb, env, pc, puc);
1234	}
1235	if (ret == 1) {
1236	#if 0
1237	printf("PF exception: NIP=0x%08x error=0x%x %p\n",
1238	env->nip, env->error_code, tb);
1239	#endif
1240	/* we restore the process signal mask as the sigreturn should
1241	do it (XXX: use sigsetjmp) */
1242	sigprocmask(SIG_SETMASK, old_set, NULL);
1243	do_raise_exception_err(env->exception_index, env->error_code);
1244	} else {
1245	/* activate soft MMU for this block */
1246	cpu_resume_from_signal(env, puc);
1247	}
1248	/* never comes here */
1249	return 1;
1250	}
1251
1252	#elif defined(TARGET_M68K)
1253	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
1254	int is_write, sigset_t *old_set,
1255	void *puc)
1256	{
1257	TranslationBlock *tb;
1258	int ret;
1259
1260	if (cpu_single_env)
1261	env = cpu_single_env; /* XXX: find a correct solution for multithread */
1262	#if defined(DEBUG_SIGNAL)
1263	printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
1264	pc, address, is_write, (unsigned long )old_set);
1265	#endif
1266	/* XXX: locking issue */
1267	if (is_write && page_unprotect(address, pc, puc)) {
1268	return 1;
1269	}
1270	/* see if it is an MMU fault */
1271	ret = cpu_m68k_handle_mmu_fault(env, address, is_write, 1, 0);
1272	if (ret < 0)
1273	return 0; /* not an MMU fault */
1274	if (ret == 0)
1275	return 1; /* the MMU fault was handled without causing real CPU fault */
1276	/* now we have a real cpu fault */
1277	tb = tb_find_pc(pc);
1278	if (tb) {
1279	/* the PC is inside the translated code. It means that we have
1280	a virtual CPU fault */
1281	cpu_restore_state(tb, env, pc, puc);
1282	}
1283	/* we restore the process signal mask as the sigreturn should
1284	do it (XXX: use sigsetjmp) */
1285	sigprocmask(SIG_SETMASK, old_set, NULL);
1286	cpu_loop_exit();
1287	/* never comes here */
1288	return 1;
1289	}
1290
1291	#elif defined (TARGET_MIPS)
1292	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
1293	int is_write, sigset_t *old_set,
1294	void *puc)
1295	{
1296	TranslationBlock *tb;
1297	int ret;
1298
1299	if (cpu_single_env)
1300	env = cpu_single_env; /* XXX: find a correct solution for multithread */
1301	#if defined(DEBUG_SIGNAL)
1302	printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
1303	pc, address, is_write, (unsigned long )old_set);
1304	#endif
1305	/* XXX: locking issue */
1306	if (is_write && page_unprotect(h2g(address), pc, puc)) {
1307	return 1;
1308	}
1309
1310	/* see if it is an MMU fault */
1311	ret = cpu_mips_handle_mmu_fault(env, address, is_write, 1, 0);
1312	if (ret < 0)
1313	return 0; /* not an MMU fault */
1314	if (ret == 0)
1315	return 1; /* the MMU fault was handled without causing real CPU fault */
1316
1317	/* now we have a real cpu fault */
1318	tb = tb_find_pc(pc);
1319	if (tb) {
1320	/* the PC is inside the translated code. It means that we have
1321	a virtual CPU fault */
1322	cpu_restore_state(tb, env, pc, puc);
1323	}
1324	if (ret == 1) {
1325	#if 0
1326	printf("PF exception: NIP=0x%08x error=0x%x %p\n",
1327	env->nip, env->error_code, tb);
1328	#endif
1329	/* we restore the process signal mask as the sigreturn should
1330	do it (XXX: use sigsetjmp) */
1331	sigprocmask(SIG_SETMASK, old_set, NULL);
1332	do_raise_exception_err(env->exception_index, env->error_code);
1333	} else {
1334	/* activate soft MMU for this block */
1335	cpu_resume_from_signal(env, puc);
1336	}
1337	/* never comes here */
1338	return 1;
1339	}
1340
1341	#elif defined (TARGET_SH4)
1342	static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
1343	int is_write, sigset_t *old_set,
1344	void *puc)
1345	{
1346	TranslationBlock *tb;
1347	int ret;
1348
1349	if (cpu_single_env)
1350	env = cpu_single_env; /* XXX: find a correct solution for multithread */
1351	#if defined(DEBUG_SIGNAL)
1352	printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
1353	pc, address, is_write, (unsigned long )old_set);
1354	#endif
1355	/* XXX: locking issue */
1356	if (is_write && page_unprotect(h2g(address), pc, puc)) {
1357	return 1;
1358	}
1359
1360	/* see if it is an MMU fault */
1361	ret = cpu_sh4_handle_mmu_fault(env, address, is_write, 1, 0);
1362	if (ret < 0)
1363	return 0; /* not an MMU fault */
1364	if (ret == 0)
1365	return 1; /* the MMU fault was handled without causing real CPU fault */
1366
1367	/* now we have a real cpu fault */
1368	tb = tb_find_pc(pc);
1369	if (tb) {
1370	/* the PC is inside the translated code. It means that we have
1371	a virtual CPU fault */
1372	cpu_restore_state(tb, env, pc, puc);
1373	}
1374	#if 0
1375	printf("PF exception: NIP=0x%08x error=0x%x %p\n",
1376	env->nip, env->error_code, tb);
1377	#endif
1378	/* we restore the process signal mask as the sigreturn should
1379	do it (XXX: use sigsetjmp) */
1380	sigprocmask(SIG_SETMASK, old_set, NULL);
1381	cpu_loop_exit();
1382	/* never comes here */
1383	return 1;
1384	}
1385	#else
1386	#error unsupported target CPU
1387	#endif
1388
1389	#if defined(__i386__)
1390
1391	#if defined(__APPLE__)
1392	# include <sys/ucontext.h>
1393
1394	# define EIP_sig(context) (((unsigned long)&(context)->uc_mcontext->ss.eip))
1395	# define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
1396	# define ERROR_sig(context) ((context)->uc_mcontext->es.err)
1397	#else
1398	# define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
1399	# define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
1400	# define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
1401	#endif
1402
1403	int cpu_signal_handler(int host_signum, void *pinfo,
1404	void *puc)
1405	{
1406	siginfo_t *info = pinfo;
1407	struct ucontext *uc = puc;
1408	unsigned long pc;
1409	int trapno;
1410
1411	#ifndef REG_EIP
1412	/* for glibc 2.1 */
1413	#define REG_EIP EIP
1414	#define REG_ERR ERR
1415	#define REG_TRAPNO TRAPNO
1416	#endif
1417	pc = uc->uc_mcontext.gregs[REG_EIP];
1418	trapno = uc->uc_mcontext.gregs[REG_TRAPNO];
1419	#if defined(TARGET_I386) && defined(USE_CODE_COPY)
1420	if (trapno == 0x00 \|\| trapno == 0x05) {
1421	/* send division by zero or bound exception */
1422	cpu_send_trap(pc, trapno, uc);
1423	return 1;
1424	} else
1425	#endif
1426	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1427	trapno == 0xe ?
1428	(uc->uc_mcontext.gregs[REG_ERR] >> 1) & 1 : 0,
1429	&uc->uc_sigmask, puc);
1430	}
1431
1432	#elif defined(__x86_64__)
1433
1434	int cpu_signal_handler(int host_signum, void *pinfo,
1435	void *puc)
1436	{
1437	siginfo_t *info = pinfo;
1438	struct ucontext *uc = puc;
1439	unsigned long pc;
1440
1441	pc = uc->uc_mcontext.gregs[REG_RIP];
1442	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1443	uc->uc_mcontext.gregs[REG_TRAPNO] == 0xe ?
1444	(uc->uc_mcontext.gregs[REG_ERR] >> 1) & 1 : 0,
1445	&uc->uc_sigmask, puc);
1446	}
1447
1448	#elif defined(__powerpc__)
1449
1450	/***********************************************************************
1451	* signal context platform-specific definitions
1452	* From Wine
1453	*/
1454	#ifdef linux
1455	/* All Registers access - only for local access */
1456	# define REG_sig(reg_name, context) ((context)->uc_mcontext.regs->reg_name)
1457	/* Gpr Registers access */
1458	# define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
1459	# define IAR_sig(context) REG_sig(nip, context) /* Program counter */
1460	# define MSR_sig(context) REG_sig(msr, context) /* Machine State Register (Supervisor) */
1461	# define CTR_sig(context) REG_sig(ctr, context) /* Count register */
1462	# define XER_sig(context) REG_sig(xer, context) /* User's integer exception register */
1463	# define LR_sig(context) REG_sig(link, context) /* Link register */
1464	# define CR_sig(context) REG_sig(ccr, context) /* Condition register */
1465	/* Float Registers access */
1466	# define FLOAT_sig(reg_num, context) (((double)((char)((context)->uc_mcontext.regs+48*4)))[reg_num])
1467	# define FPSCR_sig(context) ((int)((char)((context)->uc_mcontext.regs+(48+322)*4)))
1468	/* Exception Registers access */
1469	# define DAR_sig(context) REG_sig(dar, context)
1470	# define DSISR_sig(context) REG_sig(dsisr, context)
1471	# define TRAP_sig(context) REG_sig(trap, context)
1472	#endif /* linux */
1473
1474	#ifdef __APPLE__
1475	# include <sys/ucontext.h>
1476	typedef struct ucontext SIGCONTEXT;
1477	/* All Registers access - only for local access */
1478	# define REG_sig(reg_name, context) ((context)->uc_mcontext->ss.reg_name)
1479	# define FLOATREG_sig(reg_name, context) ((context)->uc_mcontext->fs.reg_name)
1480	# define EXCEPREG_sig(reg_name, context) ((context)->uc_mcontext->es.reg_name)
1481	# define VECREG_sig(reg_name, context) ((context)->uc_mcontext->vs.reg_name)
1482	/* Gpr Registers access */
1483	# define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
1484	# define IAR_sig(context) REG_sig(srr0, context) /* Program counter */
1485	# define MSR_sig(context) REG_sig(srr1, context) /* Machine State Register (Supervisor) */
1486	# define CTR_sig(context) REG_sig(ctr, context)
1487	# define XER_sig(context) REG_sig(xer, context) /* Link register */
1488	# define LR_sig(context) REG_sig(lr, context) /* User's integer exception register */
1489	# define CR_sig(context) REG_sig(cr, context) /* Condition register */
1490	/* Float Registers access */
1491	# define FLOAT_sig(reg_num, context) FLOATREG_sig(fpregs[reg_num], context)
1492	# define FPSCR_sig(context) ((double)FLOATREG_sig(fpscr, context))
1493	/* Exception Registers access */
1494	# define DAR_sig(context) EXCEPREG_sig(dar, context) /* Fault registers for coredump */
1495	# define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
1496	# define TRAP_sig(context) EXCEPREG_sig(exception, context) /* number of powerpc exception taken */
1497	#endif /* __APPLE__ */
1498
1499	int cpu_signal_handler(int host_signum, void *pinfo,
1500	void *puc)
1501	{
1502	siginfo_t *info = pinfo;
1503	struct ucontext *uc = puc;
1504	unsigned long pc;
1505	int is_write;
1506
1507	pc = IAR_sig(uc);
1508	is_write = 0;
1509	#if 0
1510	/* ppc 4xx case */
1511	if (DSISR_sig(uc) & 0x00800000)
1512	is_write = 1;
1513	#else
1514	if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000))
1515	is_write = 1;
1516	#endif
1517	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1518	is_write, &uc->uc_sigmask, puc);
1519	}
1520
1521	#elif defined(__alpha__)
1522
1523	int cpu_signal_handler(int host_signum, void *pinfo,
1524	void *puc)
1525	{
1526	siginfo_t *info = pinfo;
1527	struct ucontext *uc = puc;
1528	uint32_t *pc = uc->uc_mcontext.sc_pc;
1529	uint32_t insn = *pc;
1530	int is_write = 0;
1531
1532	/* XXX: need kernel patch to get write flag faster */
1533	switch (insn >> 26) {
1534	case 0x0d: // stw
1535	case 0x0e: // stb
1536	case 0x0f: // stq_u
1537	case 0x24: // stf
1538	case 0x25: // stg
1539	case 0x26: // sts
1540	case 0x27: // stt
1541	case 0x2c: // stl
1542	case 0x2d: // stq
1543	case 0x2e: // stl_c
1544	case 0x2f: // stq_c
1545	is_write = 1;
1546	}
1547
1548	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1549	is_write, &uc->uc_sigmask, puc);
1550	}
1551	#elif defined(__sparc__)
1552
1553	int cpu_signal_handler(int host_signum, void *pinfo,
1554	void *puc)
1555	{
1556	siginfo_t *info = pinfo;
1557	uint32_t regs = (uint32_t )(info + 1);
1558	void *sigmask = (regs + 20);
1559	unsigned long pc;
1560	int is_write;
1561	uint32_t insn;
1562
1563	/* XXX: is there a standard glibc define ? */
1564	pc = regs[1];
1565	/* XXX: need kernel patch to get write flag faster */
1566	is_write = 0;
1567	insn = (uint32_t )pc;
1568	if ((insn >> 30) == 3) {
1569	switch((insn >> 19) & 0x3f) {
1570	case 0x05: // stb
1571	case 0x06: // sth
1572	case 0x04: // st
1573	case 0x07: // std
1574	case 0x24: // stf
1575	case 0x27: // stdf
1576	case 0x25: // stfsr
1577	is_write = 1;
1578	break;
1579	}
1580	}
1581	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1582	is_write, sigmask, NULL);
1583	}
1584
1585	#elif defined(__arm__)
1586
1587	int cpu_signal_handler(int host_signum, void *pinfo,
1588	void *puc)
1589	{
1590	siginfo_t *info = pinfo;
1591	struct ucontext *uc = puc;
1592	unsigned long pc;
1593	int is_write;
1594
1595	pc = uc->uc_mcontext.gregs[R15];
1596	/* XXX: compute is_write */
1597	is_write = 0;
1598	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1599	is_write,
1600	&uc->uc_sigmask, puc);
1601	}
1602
1603	#elif defined(__mc68000)
1604
1605	int cpu_signal_handler(int host_signum, void *pinfo,
1606	void *puc)
1607	{
1608	siginfo_t *info = pinfo;
1609	struct ucontext *uc = puc;
1610	unsigned long pc;
1611	int is_write;
1612
1613	pc = uc->uc_mcontext.gregs[16];
1614	/* XXX: compute is_write */
1615	is_write = 0;
1616	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1617	is_write,
1618	&uc->uc_sigmask, puc);
1619	}
1620
1621	#elif defined(__ia64)
1622
1623	#ifndef __ISR_VALID
1624	/* This ought to be in <bits/siginfo.h>... */
1625	# define __ISR_VALID 1
1626	#endif
1627
1628	int cpu_signal_handler(int host_signum, void pinfo, void puc)
1629	{
1630	siginfo_t *info = pinfo;
1631	struct ucontext *uc = puc;
1632	unsigned long ip;
1633	int is_write = 0;
1634
1635	ip = uc->uc_mcontext.sc_ip;
1636	switch (host_signum) {
1637	case SIGILL:
1638	case SIGFPE:
1639	case SIGSEGV:
1640	case SIGBUS:
1641	case SIGTRAP:
1642	if (info->si_code && (info->si_segvflags & __ISR_VALID))
1643	/* ISR.W (write-access) is bit 33: */
1644	is_write = (info->si_isr >> 33) & 1;
1645	break;
1646
1647	default:
1648	break;
1649	}
1650	return handle_cpu_signal(ip, (unsigned long)info->si_addr,
1651	is_write,
1652	&uc->uc_sigmask, puc);
1653	}
1654
1655	#elif defined(__s390__)
1656
1657	int cpu_signal_handler(int host_signum, void *pinfo,
1658	void *puc)
1659	{
1660	siginfo_t *info = pinfo;
1661	struct ucontext *uc = puc;
1662	unsigned long pc;
1663	int is_write;
1664
1665	pc = uc->uc_mcontext.psw.addr;
1666	/* XXX: compute is_write */
1667	is_write = 0;
1668	return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1669	is_write,
1670	&uc->uc_sigmask, puc);
1671	}
1672
1673	#else
1674
1675	#error host CPU specific signal handler needed
1676
1677	#endif
1678
1679	#endif /* !defined(CONFIG_SOFTMMU) */

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