cpu-exec.c@ 62639

最後變更在這個檔案從62639是 62286,由 vboxsync 提交於 8 年前
REM: Fixed TRPM -> recompiler IRQ translation problem, well hacked it.
屬性 svn:eol-style 設為 `native`
檔案大小: 52.9 KB

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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, see <http://www.gnu.org/licenses/>.
18	*/
19
20	/*
21	* Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
22	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
23	* the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
24	* a choice of LGPL license versions is made available with the language indicating
25	* that LGPLv2 or any later version may be used, or where a choice of which version
26	* of the LGPL is applied is otherwise unspecified.
27	*/
28
29	#include "config.h"
30	#include "exec.h"
31	#include "disas.h"
32	#include "tcg.h"
33	#include "kvm.h"
34	#include "qemu-barrier.h"
35
36	#if !defined(CONFIG_SOFTMMU)
37	#undef EAX
38	#undef ECX
39	#undef EDX
40	#undef EBX
41	#undef ESP
42	#undef EBP
43	#undef ESI
44	#undef EDI
45	#undef EIP
46	#include <signal.h>
47	#ifdef __linux__
48	#include <sys/ucontext.h>
49	#endif
50	#endif
51
52	#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
53	// Work around ugly bugs in glibc that mangle global register contents
54	#undef env
55	#define env cpu_single_env
56	#endif
57
58	int tb_invalidated_flag;
59
60	//#define CONFIG_DEBUG_EXEC
61	//#define DEBUG_SIGNAL
62
63	int qemu_cpu_has_work(CPUState *env)
64	{
65	return cpu_has_work(env);
66	}
67
68	void cpu_loop_exit(void)
69	{
70	env->current_tb = NULL;
71	longjmp(env->jmp_env, 1);
72	}
73
74	/* exit the current TB from a signal handler. The host registers are
75	restored in a state compatible with the CPU emulator
76	*/
77	void cpu_resume_from_signal(CPUState env1, void puc)
78	{
79	#if !defined(CONFIG_SOFTMMU)
80	#ifdef __linux__
81	struct ucontext *uc = puc;
82	#elif defined(__OpenBSD__)
83	struct sigcontext *uc = puc;
84	#endif
85	#endif
86
87	env = env1;
88
89	/* XXX: restore cpu registers saved in host registers */
90
91	#if !defined(CONFIG_SOFTMMU)
92	if (puc) {
93	/* XXX: use siglongjmp ? */
94	#ifdef __linux__
95	#ifdef __ia64
96	sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
97	#else
98	sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
99	#endif
100	#elif defined(__OpenBSD__)
101	sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
102	#endif
103	}
104	#endif
105	env->exception_index = -1;
106	longjmp(env->jmp_env, 1);
107	}
108
109	/* Execute the code without caching the generated code. An interpreter
110	could be used if available. */
111	static void cpu_exec_nocache(int max_cycles, TranslationBlock *orig_tb)
112	{
113	uintptr_t next_tb;
114	TranslationBlock *tb;
115
116	/* Should never happen.
117	We only end up here when an existing TB is too long. */
118	if (max_cycles > CF_COUNT_MASK)
119	max_cycles = CF_COUNT_MASK;
120
121	tb = tb_gen_code(env, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
122	max_cycles);
123	env->current_tb = tb;
124	/* execute the generated code */
125	#if defined(VBOX) && defined(GCC_WITH_BUGGY_REGPARM)
126	tcg_qemu_tb_exec(tb->tc_ptr, next_tb);
127	#else
128	next_tb = tcg_qemu_tb_exec(tb->tc_ptr);
129	#endif
130	env->current_tb = NULL;
131
132	if ((next_tb & 3) == 2) {
133	/* Restore PC. This may happen if async event occurs before
134	the TB starts executing. */
135	cpu_pc_from_tb(env, tb);
136	}
137	tb_phys_invalidate(tb, -1);
138	tb_free(tb);
139	}
140
141	static TranslationBlock *tb_find_slow(target_ulong pc,
142	target_ulong cs_base,
143	uint64_t flags)
144	{
145	TranslationBlock tb, *ptb1;
146	unsigned int h;
147	tb_page_addr_t phys_pc, phys_page1, phys_page2;
148	target_ulong virt_page2;
149
150	tb_invalidated_flag = 0;
151
152	/* find translated block using physical mappings */
153	phys_pc = get_page_addr_code(env, pc);
154	phys_page1 = phys_pc & TARGET_PAGE_MASK;
155	phys_page2 = -1;
156	h = tb_phys_hash_func(phys_pc);
157	ptb1 = &tb_phys_hash[h];
158	for(;;) {
159	tb = *ptb1;
160	if (!tb)
161	goto not_found;
162	if (tb->pc == pc &&
163	tb->page_addr[0] == phys_page1 &&
164	tb->cs_base == cs_base &&
165	tb->flags == flags) {
166	/* check next page if needed */
167	if (tb->page_addr[1] != -1) {
168	virt_page2 = (pc & TARGET_PAGE_MASK) +
169	TARGET_PAGE_SIZE;
170	phys_page2 = get_page_addr_code(env, virt_page2);
171	if (tb->page_addr[1] == phys_page2)
172	goto found;
173	} else {
174	goto found;
175	}
176	}
177	ptb1 = &tb->phys_hash_next;
178	}
179	not_found:
180	/* if no translated code available, then translate it now */
181	tb = tb_gen_code(env, pc, cs_base, flags, 0);
182
183	found:
184	/* we add the TB in the virtual pc hash table */
185	env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;
186	return tb;
187	}
188
189	static inline TranslationBlock *tb_find_fast(void)
190	{
191	TranslationBlock *tb;
192	target_ulong cs_base, pc;
193	int flags;
194
195	/* we record a subset of the CPU state. It will
196	always be the same before a given translated block
197	is executed. */
198	cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
199	tb = env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)];
200	if (unlikely(!tb \|\| tb->pc != pc \|\| tb->cs_base != cs_base \|\|
201	tb->flags != flags)) {
202	tb = tb_find_slow(pc, cs_base, flags);
203	}
204	return tb;
205	}
206
207	static CPUDebugExcpHandler *debug_excp_handler;
208
209	CPUDebugExcpHandler cpu_set_debug_excp_handler(CPUDebugExcpHandler handler)
210	{
211	CPUDebugExcpHandler *old_handler = debug_excp_handler;
212
213	debug_excp_handler = handler;
214	return old_handler;
215	}
216
217	static void cpu_handle_debug_exception(CPUState *env)
218	{
219	CPUWatchpoint *wp;
220
221	if (!env->watchpoint_hit)
222	QTAILQ_FOREACH(wp, &env->watchpoints, entry)
223	wp->flags &= ~BP_WATCHPOINT_HIT;
224
225	if (debug_excp_handler)
226	debug_excp_handler(env);
227	}
228
229	/* main execution loop */
230
231	volatile sig_atomic_t exit_request;
232
233	int cpu_exec(CPUState *env1)
234	{
235	volatile host_reg_t saved_env_reg;
236	int ret VBOX_ONLY(= 0), interrupt_request;
237	TranslationBlock *tb;
238	uint8_t *tc_ptr;
239	uintptr_t next_tb;
240
241	# ifndef VBOX
242	if (cpu_halted(env1) == EXCP_HALTED)
243	return EXCP_HALTED;
244	# endif /* !VBOX */
245
246	cpu_single_env = env1;
247
248	/* the access to env below is actually saving the global register's
249	value, so that files not including target-xyz/exec.h are free to
250	use it. */
251	QEMU_BUILD_BUG_ON (sizeof (saved_env_reg) != sizeof (env));
252	saved_env_reg = (host_reg_t) env;
253	barrier();
254	env = env1;
255
256	if (unlikely(exit_request)) {
257	env->exit_request = 1;
258	}
259
260	#if defined(TARGET_I386)
261	if (!kvm_enabled()) {
262	/* put eflags in CPU temporary format */
263	CC_SRC = env->eflags & (CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
264	DF = 1 - (2 * ((env->eflags >> 10) & 1));
265	CC_OP = CC_OP_EFLAGS;
266	env->eflags &= ~(DF_MASK \| CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
267	}
268	#elif defined(TARGET_SPARC)
269	#elif defined(TARGET_M68K)
270	env->cc_op = CC_OP_FLAGS;
271	env->cc_dest = env->sr & 0xf;
272	env->cc_x = (env->sr >> 4) & 1;
273	#elif defined(TARGET_ALPHA)
274	#elif defined(TARGET_ARM)
275	#elif defined(TARGET_PPC)
276	#elif defined(TARGET_MICROBLAZE)
277	#elif defined(TARGET_MIPS)
278	#elif defined(TARGET_SH4)
279	#elif defined(TARGET_CRIS)
280	#elif defined(TARGET_S390X)
281	/* XXXXX */
282	#else
283	#error unsupported target CPU
284	#endif
285	#ifndef VBOX /* VBOX: We need to raise traps and suchlike from the outside. */
286	env->exception_index = -1;
287	#endif /* !VBOX */
288
289	/* prepare setjmp context for exception handling */
290	for(;;) {
291	if (setjmp(env->jmp_env) == 0) {
292	#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
293	#undef env
294	env = cpu_single_env;
295	#define env cpu_single_env
296	#endif
297	#ifdef VBOX
298	env->current_tb = NULL; /* probably not needed, but whatever... */
299
300	/*
301	* Check for fatal errors first
302	*/
303	if (env->interrupt_request & CPU_INTERRUPT_RC) {
304	env->exception_index = EXCP_RC;
305	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_RC);
306	ret = env->exception_index;
307	cpu_loop_exit();
308	}
309	#endif
310
311	/* if an exception is pending, we execute it here */
312	if (env->exception_index >= 0) {
313	if (env->exception_index >= EXCP_INTERRUPT) {
314	/* exit request from the cpu execution loop */
315	ret = env->exception_index;
316	#ifdef VBOX /* because of the above stuff */
317	env->exception_index = -1;
318	#endif
319	if (ret == EXCP_DEBUG)
320	cpu_handle_debug_exception(env);
321	break;
322	} else {
323	#if defined(CONFIG_USER_ONLY)
324	/* if user mode only, we simulate a fake exception
325	which will be handled outside the cpu execution
326	loop */
327	#if defined(TARGET_I386)
328	do_interrupt_user(env->exception_index,
329	env->exception_is_int,
330	env->error_code,
331	env->exception_next_eip);
332	/* successfully delivered */
333	env->old_exception = -1;
334	#endif
335	ret = env->exception_index;
336	break;
337	#else
338	#if defined(TARGET_I386)
339	/* simulate a real cpu exception. On i386, it can
340	trigger new exceptions, but we do not handle
341	double or triple faults yet. */
342	# ifdef VBOX
343	RAWEx_ProfileStart(env, STATS_IRQ_HANDLING);
344	Log(("do_interrupt: vec=%#x int=%d pc=%04x:%RGv\n", env->exception_index, env->exception_is_int,
345	env->segs[R_CS].selector, (RTGCPTR)env->exception_next_eip));
346	# endif /* VBOX */
347	do_interrupt(env->exception_index,
348	env->exception_is_int && env->exception_is_int != EXCEPTION_IS_INT_VALUE_HARDWARE_IRQ,
349	env->error_code,
350	env->exception_next_eip,
351	env->exception_is_int == EXCEPTION_IS_INT_VALUE_HARDWARE_IRQ);
352	# ifdef IEM_VERIFICATION_MODE /* Ugly hacks */
353	cpu_loop_exit();
354	# endif
355	/* successfully delivered */
356	env->old_exception = -1;
357	# ifdef VBOX
358	RAWEx_ProfileStop(env, STATS_IRQ_HANDLING);
359	# endif /* VBOX */
360	#elif defined(TARGET_PPC)
361	do_interrupt(env);
362	#elif defined(TARGET_MICROBLAZE)
363	do_interrupt(env);
364	#elif defined(TARGET_MIPS)
365	do_interrupt(env);
366	#elif defined(TARGET_SPARC)
367	do_interrupt(env);
368	#elif defined(TARGET_ARM)
369	do_interrupt(env);
370	#elif defined(TARGET_SH4)
371	do_interrupt(env);
372	#elif defined(TARGET_ALPHA)
373	do_interrupt(env);
374	#elif defined(TARGET_CRIS)
375	do_interrupt(env);
376	#elif defined(TARGET_M68K)
377	do_interrupt(0);
378	#endif
379	env->exception_index = -1;
380	#endif
381	}
382	}
383
384	# ifndef VBOX
385	if (kvm_enabled()) {
386	kvm_cpu_exec(env);
387	longjmp(env->jmp_env, 1);
388	}
389	# endif /* !VBOX */
390
391	next_tb = 0; /* force lookup of first TB */
392	for(;;) {
393	interrupt_request = env->interrupt_request;
394	if (unlikely(interrupt_request)) {
395	if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
396	/* Mask out external interrupts for this step. */
397	interrupt_request &= ~(CPU_INTERRUPT_HARD \|
398	CPU_INTERRUPT_FIQ \|
399	CPU_INTERRUPT_SMI \|
400	CPU_INTERRUPT_NMI);
401	}
402	if (interrupt_request & CPU_INTERRUPT_DEBUG) {
403	env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
404	env->exception_index = EXCP_DEBUG;
405	cpu_loop_exit();
406	}
407	#if defined(TARGET_ARM) \|\| defined(TARGET_SPARC) \|\| defined(TARGET_MIPS) \|\| \
408	defined(TARGET_PPC) \|\| defined(TARGET_ALPHA) \|\| defined(TARGET_CRIS) \|\| \
409	defined(TARGET_MICROBLAZE)
410	if (interrupt_request & CPU_INTERRUPT_HALT) {
411	env->interrupt_request &= ~CPU_INTERRUPT_HALT;
412	env->halted = 1;
413	env->exception_index = EXCP_HLT;
414	cpu_loop_exit();
415	}
416	#endif
417	#if defined(TARGET_I386)
418	# ifdef VBOX
419	/* Memory registration may post a tlb flush request, process it ASAP. */
420	if (interrupt_request & (CPU_INTERRUPT_EXTERNAL_FLUSH_TLB)) {
421	tlb_flush(env, true); /* (clears the flush flag) */
422	}
423
424	/* Single instruction exec request, we execute it and return (one way or the other).
425	The caller will always reschedule after doing this operation! */
426	if (interrupt_request & CPU_INTERRUPT_SINGLE_INSTR)
427	{
428	/* not in flight are we? (if we are, we trapped) */
429	if (!(env->interrupt_request & CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT))
430	{
431	ASMAtomicOrS32((int32_t volatile *)&env->interrupt_request, CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT);
432	env->exception_index = EXCP_SINGLE_INSTR;
433	if (emulate_single_instr(env) == -1)
434	AssertMsgFailed(("REM: emulate_single_instr failed for EIP=%RGv!!\n", (RTGCPTR)env->eip));
435
436	/* When we receive an external interrupt during execution of this single
437	instruction, then we should stay here. We will leave when we're ready
438	for raw-mode or when interrupted by pending EMT requests. */
439	interrupt_request = env->interrupt_request; /* reload this! */
440	if ( !(interrupt_request & CPU_INTERRUPT_HARD)
441	\|\| !(env->eflags & IF_MASK)
442	\|\| (env->hflags & HF_INHIBIT_IRQ_MASK)
443	\|\| (env->state & CPU_RAW_HM)
444	)
445	{
446	env->exception_index = ret = EXCP_SINGLE_INSTR;
447	cpu_loop_exit();
448	}
449	}
450	/* Clear CPU_INTERRUPT_SINGLE_INSTR and leave CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT set. */
451	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_SINGLE_INSTR);
452	# ifdef IEM_VERIFICATION_MODE
453	env->exception_index = ret = EXCP_SINGLE_INSTR;
454	cpu_loop_exit();
455	# endif
456	}
457	# endif /* VBOX */
458
459	# ifndef VBOX /** @todo reconcile our code with the following... */
460	if (interrupt_request & CPU_INTERRUPT_INIT) {
461	svm_check_intercept(SVM_EXIT_INIT);
462	do_cpu_init(env);
463	env->exception_index = EXCP_HALTED;
464	cpu_loop_exit();
465	} else if (interrupt_request & CPU_INTERRUPT_SIPI) {
466	do_cpu_sipi(env);
467	} else if (env->hflags2 & HF2_GIF_MASK) {
468	if ((interrupt_request & CPU_INTERRUPT_SMI) &&
469	!(env->hflags & HF_SMM_MASK)) {
470	svm_check_intercept(SVM_EXIT_SMI);
471	env->interrupt_request &= ~CPU_INTERRUPT_SMI;
472	do_smm_enter();
473	next_tb = 0;
474	} else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
475	!(env->hflags2 & HF2_NMI_MASK)) {
476	env->interrupt_request &= ~CPU_INTERRUPT_NMI;
477	env->hflags2 \|= HF2_NMI_MASK;
478	do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
479	next_tb = 0;
480	} else if (interrupt_request & CPU_INTERRUPT_MCE) {
481	env->interrupt_request &= ~CPU_INTERRUPT_MCE;
482	do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
483	next_tb = 0;
484	} else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
485	(((env->hflags2 & HF2_VINTR_MASK) &&
486	(env->hflags2 & HF2_HIF_MASK)) \|\|
487	(!(env->hflags2 & HF2_VINTR_MASK) &&
488	(env->eflags & IF_MASK &&
489	!(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
490	int intno;
491	svm_check_intercept(SVM_EXIT_INTR);
492	env->interrupt_request &= ~(CPU_INTERRUPT_HARD \| CPU_INTERRUPT_VIRQ);
493	intno = cpu_get_pic_interrupt(env);
494	qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
495	#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
496	#undef env
497	env = cpu_single_env;
498	#define env cpu_single_env
499	#endif
500	do_interrupt(intno, 0, 0, 0, 1);
501	/* ensure that no TB jump will be modified as
502	the program flow was changed */
503	next_tb = 0;
504	#if !defined(CONFIG_USER_ONLY)
505	} else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
506	(env->eflags & IF_MASK) &&
507	!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
508	int intno;
509	/* FIXME: this should respect TPR */
510	svm_check_intercept(SVM_EXIT_VINTR);
511	intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
512	qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
513	do_interrupt(intno, 0, 0, 0, 1);
514	env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
515	next_tb = 0;
516	#endif
517	}
518	}
519	# else /* VBOX */
520	RAWEx_ProfileStart(env, STATS_IRQ_HANDLING);
521	if ((interrupt_request & CPU_INTERRUPT_SMI) &&
522	!(env->hflags & HF_SMM_MASK)) {
523	env->interrupt_request &= ~CPU_INTERRUPT_SMI;
524	do_smm_enter();
525	next_tb = 0;
526	}
527	else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
528	(env->eflags & IF_MASK) &&
529	!(env->hflags & HF_INHIBIT_IRQ_MASK))
530	{
531	/* if hardware interrupt pending, we execute it */
532	int intno;
533	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_HARD);
534	intno = cpu_get_pic_interrupt(env);
535	if (intno >= 0)
536	{
537	Log(("do_interrupt %d\n", intno));
538	do_interrupt(intno, 0, 0, 0, 1);
539	}
540	/* ensure that no TB jump will be modified as
541	the program flow was changed */
542	next_tb = 0;
543	}
544	# endif /* VBOX */
545	#elif defined(TARGET_PPC)
546	#if 0
547	if ((interrupt_request & CPU_INTERRUPT_RESET)) {
548	cpu_reset(env);
549	}
550	#endif
551	if (interrupt_request & CPU_INTERRUPT_HARD) {
552	ppc_hw_interrupt(env);
553	if (env->pending_interrupts == 0)
554	env->interrupt_request &= ~CPU_INTERRUPT_HARD;
555	next_tb = 0;
556	}
557	#elif defined(TARGET_MICROBLAZE)
558	if ((interrupt_request & CPU_INTERRUPT_HARD)
559	&& (env->sregs[SR_MSR] & MSR_IE)
560	&& !(env->sregs[SR_MSR] & (MSR_EIP \| MSR_BIP))
561	&& !(env->iflags & (D_FLAG \| IMM_FLAG))) {
562	env->exception_index = EXCP_IRQ;
563	do_interrupt(env);
564	next_tb = 0;
565	}
566	#elif defined(TARGET_MIPS)
567	if ((interrupt_request & CPU_INTERRUPT_HARD) &&
568	(env->CP0_Status & env->CP0_Cause & CP0Ca_IP_mask) &&
569	(env->CP0_Status & (1 << CP0St_IE)) &&
570	!(env->CP0_Status & (1 << CP0St_EXL)) &&
571	!(env->CP0_Status & (1 << CP0St_ERL)) &&
572	!(env->hflags & MIPS_HFLAG_DM)) {
573	/* Raise it */
574	env->exception_index = EXCP_EXT_INTERRUPT;
575	env->error_code = 0;
576	do_interrupt(env);
577	next_tb = 0;
578	}
579	#elif defined(TARGET_SPARC)
580	if (interrupt_request & CPU_INTERRUPT_HARD) {
581	if (cpu_interrupts_enabled(env) &&
582	env->interrupt_index > 0) {
583	int pil = env->interrupt_index & 0xf;
584	int type = env->interrupt_index & 0xf0;
585
586	if (((type == TT_EXTINT) &&
587	cpu_pil_allowed(env, pil)) \|\|
588	type != TT_EXTINT) {
589	env->exception_index = env->interrupt_index;
590	do_interrupt(env);
591	next_tb = 0;
592	}
593	}
594	} else if (interrupt_request & CPU_INTERRUPT_TIMER) {
595	//do_interrupt(0, 0, 0, 0, 0);
596	env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
597	}
598	#elif defined(TARGET_ARM)
599	if (interrupt_request & CPU_INTERRUPT_FIQ
600	&& !(env->uncached_cpsr & CPSR_F)) {
601	env->exception_index = EXCP_FIQ;
602	do_interrupt(env);
603	next_tb = 0;
604	}
605	/* ARMv7-M interrupt return works by loading a magic value
606	into the PC. On real hardware the load causes the
607	return to occur. The qemu implementation performs the
608	jump normally, then does the exception return when the
609	CPU tries to execute code at the magic address.
610	This will cause the magic PC value to be pushed to
611	the stack if an interrupt occured at the wrong time.
612	We avoid this by disabling interrupts when
613	pc contains a magic address. */
614	if (interrupt_request & CPU_INTERRUPT_HARD
615	&& ((IS_M(env) && env->regs[15] < 0xfffffff0)
616	\|\| !(env->uncached_cpsr & CPSR_I))) {
617	env->exception_index = EXCP_IRQ;
618	do_interrupt(env);
619	next_tb = 0;
620	}
621	#elif defined(TARGET_SH4)
622	if (interrupt_request & CPU_INTERRUPT_HARD) {
623	do_interrupt(env);
624	next_tb = 0;
625	}
626	#elif defined(TARGET_ALPHA)
627	if (interrupt_request & CPU_INTERRUPT_HARD) {
628	do_interrupt(env);
629	next_tb = 0;
630	}
631	#elif defined(TARGET_CRIS)
632	if (interrupt_request & CPU_INTERRUPT_HARD
633	&& (env->pregs[PR_CCS] & I_FLAG)
634	&& !env->locked_irq) {
635	env->exception_index = EXCP_IRQ;
636	do_interrupt(env);
637	next_tb = 0;
638	}
639	if (interrupt_request & CPU_INTERRUPT_NMI
640	&& (env->pregs[PR_CCS] & M_FLAG)) {
641	env->exception_index = EXCP_NMI;
642	do_interrupt(env);
643	next_tb = 0;
644	}
645	#elif defined(TARGET_M68K)
646	if (interrupt_request & CPU_INTERRUPT_HARD
647	&& ((env->sr & SR_I) >> SR_I_SHIFT)
648	< env->pending_level) {
649	/* Real hardware gets the interrupt vector via an
650	IACK cycle at this point. Current emulated
651	hardware doesn't rely on this, so we
652	provide/save the vector when the interrupt is
653	first signalled. */
654	env->exception_index = env->pending_vector;
655	do_interrupt(1);
656	next_tb = 0;
657	}
658	#endif
659	/* Don't use the cached interupt_request value,
660	do_interrupt may have updated the EXITTB flag. */
661	if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
662	#ifndef VBOX
663	env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
664	#else /* VBOX */
665	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_EXITTB);
666	#endif /* VBOX */
667	/* ensure that no TB jump will be modified as
668	the program flow was changed */
669	next_tb = 0;
670	}
671	#ifdef VBOX
672	RAWEx_ProfileStop(env, STATS_IRQ_HANDLING);
673	if (interrupt_request & CPU_INTERRUPT_RC) {
674	env->exception_index = EXCP_RC;
675	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_RC);
676	ret = env->exception_index;
677	cpu_loop_exit();
678	}
679	if (interrupt_request & (CPU_INTERRUPT_EXTERNAL_EXIT)) {
680	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~(CPU_INTERRUPT_EXTERNAL_EXIT));
681	env->exit_request = 1;
682	}
683	#endif
684	}
685	if (unlikely(env->exit_request)) {
686	env->exit_request = 0;
687	env->exception_index = EXCP_INTERRUPT;
688	cpu_loop_exit();
689	}
690
691	#ifdef VBOX
692	/*
693	* Check if we the CPU state allows us to execute the code in raw-mode.
694	*/
695	RAWEx_ProfileStart(env, STATS_RAW_CHECK);
696	if (remR3CanExecuteRaw(env,
697	env->eip + env->segs[R_CS].base,
698	env->hflags \| (env->eflags & (IOPL_MASK \| TF_MASK \| VM_MASK)),
699	&env->exception_index))
700	{
701	RAWEx_ProfileStop(env, STATS_RAW_CHECK);
702	ret = env->exception_index;
703	cpu_loop_exit();
704	}
705	RAWEx_ProfileStop(env, STATS_RAW_CHECK);
706	#endif /* VBOX */
707
708	#if defined(DEBUG_DISAS) \|\| defined(CONFIG_DEBUG_EXEC)
709	if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
710	/* restore flags in standard format */
711	#if defined(TARGET_I386)
712	env->eflags = env->eflags \| helper_cc_compute_all(CC_OP) \| (DF & DF_MASK);
713	log_cpu_state(env, X86_DUMP_CCOP);
714	env->eflags &= ~(DF_MASK \| CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
715	#elif defined(TARGET_M68K)
716	cpu_m68k_flush_flags(env, env->cc_op);
717	env->cc_op = CC_OP_FLAGS;
718	env->sr = (env->sr & 0xffe0)
719	\| env->cc_dest \| (env->cc_x << 4);
720	log_cpu_state(env, 0);
721	#else
722	log_cpu_state(env, 0);
723	#endif
724	}
725	#endif /* DEBUG_DISAS \|\| CONFIG_DEBUG_EXEC */
726	#ifdef VBOX
727	RAWEx_ProfileStart(env, STATS_TLB_LOOKUP);
728	#endif /VBOX/
729	spin_lock(&tb_lock);
730	tb = tb_find_fast();
731	/* Note: we do it here to avoid a gcc bug on Mac OS X when
732	doing it in tb_find_slow */
733	if (tb_invalidated_flag) {
734	/* as some TB could have been invalidated because
735	of memory exceptions while generating the code, we
736	must recompute the hash index here */
737	next_tb = 0;
738	tb_invalidated_flag = 0;
739	}
740	#ifdef CONFIG_DEBUG_EXEC
741	qemu_log_mask(CPU_LOG_EXEC, "Trace %p [" TARGET_FMT_lx "] %s\n",
742	(void *)tb->tc_ptr, tb->pc,
743	lookup_symbol(tb->pc));
744	#endif
745	/* see if we can patch the calling TB. When the TB
746	spans two pages, we cannot safely do a direct
747	jump. */
748	#ifndef VBOX
749	if (next_tb != 0 && tb->page_addr[1] == -1) {
750	#else /* VBOX */
751	if (next_tb != 0 && !(tb->cflags & CF_RAW_MODE) && tb->page_addr[1] == -1) {
752	#endif /* VBOX */
753	tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
754	}
755	spin_unlock(&tb_lock);
756	#ifdef VBOX
757	RAWEx_ProfileStop(env, STATS_TLB_LOOKUP);
758	#endif
759
760	/* cpu_interrupt might be called while translating the
761	TB, but before it is linked into a potentially
762	infinite loop and becomes env->current_tb. Avoid
763	starting execution if there is a pending interrupt. */
764	env->current_tb = tb;
765	barrier();
766	if (likely(!env->exit_request)) {
767	tc_ptr = tb->tc_ptr;
768	/* execute the generated code */
769	#ifdef VBOX
770	RAWEx_ProfileStart(env, STATS_QEMU_RUN_EMULATED_CODE);
771	#endif
772	#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
773	#undef env
774	env = cpu_single_env;
775	#define env cpu_single_env
776	#endif
777	Log5(("REM: tb=%p tc_ptr=%p %04x:%08RGv\n", tb, tc_ptr, env->segs[R_CS].selector, (RTGCPTR)env->eip));
778	#if defined(VBOX) && defined(GCC_WITH_BUGGY_REGPARM)
779	tcg_qemu_tb_exec(tc_ptr, next_tb);
780	#else
781	next_tb = tcg_qemu_tb_exec(tc_ptr);
782	#endif
783	if (next_tb)
784	Log5(("REM: next_tb=%p %04x:%08RGv\n", next_tb, env->segs[R_CS].selector, (RTGCPTR)env->eip));
785	#ifdef VBOX
786	RAWEx_ProfileStop(env, STATS_QEMU_RUN_EMULATED_CODE);
787	#endif
788	if ((next_tb & 3) == 2) {
789	/* Instruction counter expired. */
790	int insns_left;
791	tb = (TranslationBlock *)(uintptr_t)(next_tb & ~3);
792	/* Restore PC. */
793	cpu_pc_from_tb(env, tb);
794	insns_left = env->icount_decr.u32;
795	if (env->icount_extra && insns_left >= 0) {
796	/* Refill decrementer and continue execution. */
797	env->icount_extra += insns_left;
798	if (env->icount_extra > 0xffff) {
799	insns_left = 0xffff;
800	} else {
801	insns_left = env->icount_extra;
802	}
803	env->icount_extra -= insns_left;
804	env->icount_decr.u16.low = insns_left;
805	} else {
806	if (insns_left > 0) {
807	/* Execute remaining instructions. */
808	cpu_exec_nocache(insns_left, tb);
809	}
810	env->exception_index = EXCP_INTERRUPT;
811	next_tb = 0;
812	cpu_loop_exit();
813	}
814	}
815	}
816	env->current_tb = NULL;
817	/* reset soft MMU for next block (it can currently
818	only be set by a memory fault) */
819	} /* for(;;) */
820	}
821	#ifdef VBOX_HIGH_RES_TIMERS_HACK
822	/* NULL the current_tb here so cpu_interrupt() doesn't do anything
823	unnecessary (like crashing during emulate single instruction).
824	Note! Don't use env1->pVM here, the code wouldn't run with
825	gcc-4.4/amd64 anymore, see #3883. */
826	env->current_tb = NULL;
827	if ( !(env->interrupt_request & ( CPU_INTERRUPT_DEBUG \| CPU_INTERRUPT_EXTERNAL_EXIT \| CPU_INTERRUPT_RC
828	\| CPU_INTERRUPT_SINGLE_INSTR \| CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT))
829	&& ( (env->interrupt_request & CPU_INTERRUPT_EXTERNAL_TIMER)
830	\|\| TMTimerPollBool(env->pVM, env->pVCpu)) ) {
831	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_EXTERNAL_TIMER);
832	remR3ProfileStart(STATS_QEMU_RUN_TIMERS);
833	TMR3TimerQueuesDo(env->pVM);
834	remR3ProfileStop(STATS_QEMU_RUN_TIMERS);
835	}
836	#endif
837	} /* for(;;) */
838
839
840	#if defined(TARGET_I386)
841	/* restore flags in standard format */
842	env->eflags = env->eflags \| helper_cc_compute_all(CC_OP) \| (DF & DF_MASK);
843	#elif defined(TARGET_ARM)
844	/* XXX: Save/restore host fpu exception state?. */
845	#elif defined(TARGET_SPARC)
846	#elif defined(TARGET_PPC)
847	#elif defined(TARGET_M68K)
848	cpu_m68k_flush_flags(env, env->cc_op);
849	env->cc_op = CC_OP_FLAGS;
850	env->sr = (env->sr & 0xffe0)
851	\| env->cc_dest \| (env->cc_x << 4);
852	#elif defined(TARGET_MICROBLAZE)
853	#elif defined(TARGET_MIPS)
854	#elif defined(TARGET_SH4)
855	#elif defined(TARGET_ALPHA)
856	#elif defined(TARGET_CRIS)
857	#elif defined(TARGET_S390X)
858	/* XXXXX */
859	#else
860	#error unsupported target CPU
861	#endif
862
863	/* restore global registers */
864	barrier();
865	env = (void *) saved_env_reg;
866
867	# ifndef VBOX /* we might be using elsewhere, we only have one. */
868	/* fail safe : never use cpu_single_env outside cpu_exec() */
869	cpu_single_env = NULL;
870	# endif
871	return ret;
872	}
873
874	/* must only be called from the generated code as an exception can be
875	generated */
876	void tb_invalidate_page_range(target_ulong start, target_ulong end)
877	{
878	/* XXX: cannot enable it yet because it yields to MMU exception
879	where NIP != read address on PowerPC */
880	#if 0
881	target_ulong phys_addr;
882	phys_addr = get_phys_addr_code(env, start);
883	tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
884	#endif
885	}
886
887	#if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
888
889	void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
890	{
891	CPUX86State *saved_env;
892
893	saved_env = env;
894	env = s;
895	if (!(env->cr[0] & CR0_PE_MASK) \|\| (env->eflags & VM_MASK)) {
896	selector &= 0xffff;
897	cpu_x86_load_seg_cache(env, seg_reg, selector,
898	(selector << 4), 0xffff, 0);
899	} else {
900	helper_load_seg(seg_reg, selector);
901	}
902	env = saved_env;
903	}
904
905	void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
906	{
907	CPUX86State *saved_env;
908
909	saved_env = env;
910	env = s;
911
912	helper_fsave(ptr, data32);
913
914	env = saved_env;
915	}
916
917	void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
918	{
919	CPUX86State *saved_env;
920
921	saved_env = env;
922	env = s;
923
924	helper_frstor(ptr, data32);
925
926	env = saved_env;
927	}
928
929	#endif /* TARGET_I386 */
930
931	#if !defined(CONFIG_SOFTMMU)
932
933	#if defined(TARGET_I386)
934	#define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
935	#else
936	#define EXCEPTION_ACTION cpu_loop_exit()
937	#endif
938
939	/* 'pc' is the host PC at which the exception was raised. 'address' is
940	the effective address of the memory exception. 'is_write' is 1 if a
941	write caused the exception and otherwise 0'. 'old_set' is the
942	signal set which should be restored */
943	static inline int handle_cpu_signal(uintptr_t pc, uintptr_t address,
944	int is_write, sigset_t *old_set,
945	void *puc)
946	{
947	TranslationBlock *tb;
948	int ret;
949
950	if (cpu_single_env)
951	env = cpu_single_env; /* XXX: find a correct solution for multithread */
952	#if defined(DEBUG_SIGNAL)
953	qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
954	pc, address, is_write, (unsigned long )old_set);
955	#endif
956	/* XXX: locking issue */
957	if (is_write && page_unprotect(h2g(address), pc, puc)) {
958	return 1;
959	}
960
961	/* see if it is an MMU fault */
962	ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
963	if (ret < 0)
964	return 0; /* not an MMU fault */
965	if (ret == 0)
966	return 1; /* the MMU fault was handled without causing real CPU fault */
967	/* now we have a real cpu fault */
968	tb = tb_find_pc(pc);
969	if (tb) {
970	/* the PC is inside the translated code. It means that we have
971	a virtual CPU fault */
972	cpu_restore_state(tb, env, pc, puc);
973	}
974
975	/* we restore the process signal mask as the sigreturn should
976	do it (XXX: use sigsetjmp) */
977	sigprocmask(SIG_SETMASK, old_set, NULL);
978	EXCEPTION_ACTION;
979
980	/* never comes here */
981	return 1;
982	}
983
984	#if defined(__i386__)
985
986	#if defined(__APPLE__)
987	# include <sys/ucontext.h>
988
989	# define EIP_sig(context) (((unsigned long)&(context)->uc_mcontext->ss.eip))
990	# define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
991	# define ERROR_sig(context) ((context)->uc_mcontext->es.err)
992	# define MASK_sig(context) ((context)->uc_sigmask)
993	#elif defined (__NetBSD__)
994	# include <ucontext.h>
995
996	# define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
997	# define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
998	# define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
999	# define MASK_sig(context) ((context)->uc_sigmask)
1000	#elif defined (__FreeBSD__) \|\| defined(__DragonFly__)
1001	# include <ucontext.h>
1002
1003	# define EIP_sig(context) (((unsigned long)&(context)->uc_mcontext.mc_eip))
1004	# define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
1005	# define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
1006	# define MASK_sig(context) ((context)->uc_sigmask)
1007	#elif defined(__OpenBSD__)
1008	# define EIP_sig(context) ((context)->sc_eip)
1009	# define TRAP_sig(context) ((context)->sc_trapno)
1010	# define ERROR_sig(context) ((context)->sc_err)
1011	# define MASK_sig(context) ((context)->sc_mask)
1012	#else
1013	# define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
1014	# define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
1015	# define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
1016	# define MASK_sig(context) ((context)->uc_sigmask)
1017	#endif
1018
1019	int cpu_signal_handler(int host_signum, void *pinfo,
1020	void *puc)
1021	{
1022	siginfo_t *info = pinfo;
1023	#if defined(__NetBSD__) \|\| defined (__FreeBSD__) \|\| defined(__DragonFly__)
1024	ucontext_t *uc = puc;
1025	#elif defined(__OpenBSD__)
1026	struct sigcontext *uc = puc;
1027	#else
1028	struct ucontext *uc = puc;
1029	#endif
1030	uintptr_t pc;
1031	int trapno;
1032
1033	#ifndef REG_EIP
1034	/* for glibc 2.1 */
1035	#define REG_EIP EIP
1036	#define REG_ERR ERR
1037	#define REG_TRAPNO TRAPNO
1038	#endif
1039	pc = EIP_sig(uc);
1040	trapno = TRAP_sig(uc);
1041	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1042	trapno == 0xe ?
1043	(ERROR_sig(uc) >> 1) & 1 : 0,
1044	&MASK_sig(uc), puc);
1045	}
1046
1047	#elif defined(__x86_64__)
1048
1049	#ifdef __NetBSD__
1050	#define PC_sig(context) _UC_MACHINE_PC(context)
1051	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
1052	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
1053	#define MASK_sig(context) ((context)->uc_sigmask)
1054	#elif defined(__OpenBSD__)
1055	#define PC_sig(context) ((context)->sc_rip)
1056	#define TRAP_sig(context) ((context)->sc_trapno)
1057	#define ERROR_sig(context) ((context)->sc_err)
1058	#define MASK_sig(context) ((context)->sc_mask)
1059	#elif defined (__FreeBSD__) \|\| defined(__DragonFly__)
1060	#include <ucontext.h>
1061
1062	#define PC_sig(context) (((unsigned long)&(context)->uc_mcontext.mc_rip))
1063	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
1064	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
1065	#define MASK_sig(context) ((context)->uc_sigmask)
1066	#else
1067	#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
1068	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
1069	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
1070	#define MASK_sig(context) ((context)->uc_sigmask)
1071	#endif
1072
1073	int cpu_signal_handler(int host_signum, void *pinfo,
1074	void *puc)
1075	{
1076	siginfo_t *info = pinfo;
1077	uintptr_t pc;
1078	#if defined(__NetBSD__) \|\| defined (__FreeBSD__) \|\| defined(__DragonFly__)
1079	ucontext_t *uc = puc;
1080	#elif defined(__OpenBSD__)
1081	struct sigcontext *uc = puc;
1082	#else
1083	struct ucontext *uc = puc;
1084	#endif
1085
1086	pc = PC_sig(uc);
1087	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1088	TRAP_sig(uc) == 0xe ?
1089	(ERROR_sig(uc) >> 1) & 1 : 0,
1090	&MASK_sig(uc), puc);
1091	}
1092
1093	#elif defined(_ARCH_PPC)
1094
1095	/***********************************************************************
1096	* signal context platform-specific definitions
1097	* From Wine
1098	*/
1099	#ifdef linux
1100	/* All Registers access - only for local access */
1101	# define REG_sig(reg_name, context) ((context)->uc_mcontext.regs->reg_name)
1102	/* Gpr Registers access */
1103	# define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
1104	# define IAR_sig(context) REG_sig(nip, context) /* Program counter */
1105	# define MSR_sig(context) REG_sig(msr, context) /* Machine State Register (Supervisor) */
1106	# define CTR_sig(context) REG_sig(ctr, context) /* Count register */
1107	# define XER_sig(context) REG_sig(xer, context) /* User's integer exception register */
1108	# define LR_sig(context) REG_sig(link, context) /* Link register */
1109	# define CR_sig(context) REG_sig(ccr, context) /* Condition register */
1110	/* Float Registers access */
1111	# define FLOAT_sig(reg_num, context) (((double)((char)((context)->uc_mcontext.regs+48*4)))[reg_num])
1112	# define FPSCR_sig(context) ((int)((char)((context)->uc_mcontext.regs+(48+322)*4)))
1113	/* Exception Registers access */
1114	# define DAR_sig(context) REG_sig(dar, context)
1115	# define DSISR_sig(context) REG_sig(dsisr, context)
1116	# define TRAP_sig(context) REG_sig(trap, context)
1117	#endif /* linux */
1118
1119	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
1120	#include <ucontext.h>
1121	# define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
1122	# define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
1123	# define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
1124	# define XER_sig(context) ((context)->uc_mcontext.mc_xer)
1125	# define LR_sig(context) ((context)->uc_mcontext.mc_lr)
1126	# define CR_sig(context) ((context)->uc_mcontext.mc_cr)
1127	/* Exception Registers access */
1128	# define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
1129	# define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
1130	# define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
1131	#endif /* __FreeBSD__\|\| __FreeBSD_kernel__ */
1132
1133	#ifdef __APPLE__
1134	# include <sys/ucontext.h>
1135	typedef struct ucontext SIGCONTEXT;
1136	/* All Registers access - only for local access */
1137	# define REG_sig(reg_name, context) ((context)->uc_mcontext->ss.reg_name)
1138	# define FLOATREG_sig(reg_name, context) ((context)->uc_mcontext->fs.reg_name)
1139	# define EXCEPREG_sig(reg_name, context) ((context)->uc_mcontext->es.reg_name)
1140	# define VECREG_sig(reg_name, context) ((context)->uc_mcontext->vs.reg_name)
1141	/* Gpr Registers access */
1142	# define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
1143	# define IAR_sig(context) REG_sig(srr0, context) /* Program counter */
1144	# define MSR_sig(context) REG_sig(srr1, context) /* Machine State Register (Supervisor) */
1145	# define CTR_sig(context) REG_sig(ctr, context)
1146	# define XER_sig(context) REG_sig(xer, context) /* Link register */
1147	# define LR_sig(context) REG_sig(lr, context) /* User's integer exception register */
1148	# define CR_sig(context) REG_sig(cr, context) /* Condition register */
1149	/* Float Registers access */
1150	# define FLOAT_sig(reg_num, context) FLOATREG_sig(fpregs[reg_num], context)
1151	# define FPSCR_sig(context) ((double)FLOATREG_sig(fpscr, context))
1152	/* Exception Registers access */
1153	# define DAR_sig(context) EXCEPREG_sig(dar, context) /* Fault registers for coredump */
1154	# define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
1155	# define TRAP_sig(context) EXCEPREG_sig(exception, context) /* number of powerpc exception taken */
1156	#endif /* __APPLE__ */
1157
1158	int cpu_signal_handler(int host_signum, void *pinfo,
1159	void *puc)
1160	{
1161	siginfo_t *info = pinfo;
1162	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
1163	ucontext_t *uc = puc;
1164	#else
1165	struct ucontext *uc = puc;
1166	#endif
1167	uintptr_t pc;
1168	int is_write;
1169
1170	pc = IAR_sig(uc);
1171	is_write = 0;
1172	#if 0
1173	/* ppc 4xx case */
1174	if (DSISR_sig(uc) & 0x00800000)
1175	is_write = 1;
1176	#else
1177	if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000))
1178	is_write = 1;
1179	#endif
1180	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1181	is_write, &uc->uc_sigmask, puc);
1182	}
1183
1184	#elif defined(__alpha__)
1185
1186	int cpu_signal_handler(int host_signum, void *pinfo,
1187	void *puc)
1188	{
1189	siginfo_t *info = pinfo;
1190	struct ucontext *uc = puc;
1191	uint32_t *pc = uc->uc_mcontext.sc_pc;
1192	uint32_t insn = *pc;
1193	int is_write = 0;
1194
1195	/* XXX: need kernel patch to get write flag faster */
1196	switch (insn >> 26) {
1197	case 0x0d: // stw
1198	case 0x0e: // stb
1199	case 0x0f: // stq_u
1200	case 0x24: // stf
1201	case 0x25: // stg
1202	case 0x26: // sts
1203	case 0x27: // stt
1204	case 0x2c: // stl
1205	case 0x2d: // stq
1206	case 0x2e: // stl_c
1207	case 0x2f: // stq_c
1208	is_write = 1;
1209	}
1210
1211	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1212	is_write, &uc->uc_sigmask, puc);
1213	}
1214	#elif defined(__sparc__)
1215
1216	int cpu_signal_handler(int host_signum, void *pinfo,
1217	void *puc)
1218	{
1219	siginfo_t *info = pinfo;
1220	int is_write;
1221	uint32_t insn;
1222	#if !defined(__arch64__) \|\| defined(CONFIG_SOLARIS)
1223	uint32_t regs = (uint32_t )(info + 1);
1224	void *sigmask = (regs + 20);
1225	/* XXX: is there a standard glibc define ? */
1226	uintptr_t pc = regs[1];
1227	#else
1228	#ifdef __linux__
1229	struct sigcontext *sc = puc;
1230	uintptr_t pc = sc->sigc_regs.tpc;
1231	void sigmask = (void )sc->sigc_mask;
1232	#elif defined(__OpenBSD__)
1233	struct sigcontext *uc = puc;
1234	uintptr_t pc = uc->sc_pc;
1235	void sigmask = (void )(uintptr_t)uc->sc_mask;
1236	#endif
1237	#endif
1238
1239	/* XXX: need kernel patch to get write flag faster */
1240	is_write = 0;
1241	insn = (uint32_t )pc;
1242	if ((insn >> 30) == 3) {
1243	switch((insn >> 19) & 0x3f) {
1244	case 0x05: // stb
1245	case 0x15: // stba
1246	case 0x06: // sth
1247	case 0x16: // stha
1248	case 0x04: // st
1249	case 0x14: // sta
1250	case 0x07: // std
1251	case 0x17: // stda
1252	case 0x0e: // stx
1253	case 0x1e: // stxa
1254	case 0x24: // stf
1255	case 0x34: // stfa
1256	case 0x27: // stdf
1257	case 0x37: // stdfa
1258	case 0x26: // stqf
1259	case 0x36: // stqfa
1260	case 0x25: // stfsr
1261	case 0x3c: // casa
1262	case 0x3e: // casxa
1263	is_write = 1;
1264	break;
1265	}
1266	}
1267	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1268	is_write, sigmask, NULL);
1269	}
1270
1271	#elif defined(__arm__)
1272
1273	int cpu_signal_handler(int host_signum, void *pinfo,
1274	void *puc)
1275	{
1276	siginfo_t *info = pinfo;
1277	struct ucontext *uc = puc;
1278	uintptr_t pc;
1279	int is_write;
1280
1281	#if (__GLIBC__ < 2 \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
1282	pc = uc->uc_mcontext.gregs[R15];
1283	#else
1284	pc = uc->uc_mcontext.arm_pc;
1285	#endif
1286	/* XXX: compute is_write */
1287	is_write = 0;
1288	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1289	is_write,
1290	&uc->uc_sigmask, puc);
1291	}
1292
1293	#elif defined(__mc68000)
1294
1295	int cpu_signal_handler(int host_signum, void *pinfo,
1296	void *puc)
1297	{
1298	siginfo_t *info = pinfo;
1299	struct ucontext *uc = puc;
1300	uintptr_t pc;
1301	int is_write;
1302
1303	pc = uc->uc_mcontext.gregs[16];
1304	/* XXX: compute is_write */
1305	is_write = 0;
1306	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1307	is_write,
1308	&uc->uc_sigmask, puc);
1309	}
1310
1311	#elif defined(__ia64)
1312
1313	#ifndef __ISR_VALID
1314	/* This ought to be in <bits/siginfo.h>... */
1315	# define __ISR_VALID 1
1316	#endif
1317
1318	int cpu_signal_handler(int host_signum, void pinfo, void puc)
1319	{
1320	siginfo_t *info = pinfo;
1321	struct ucontext *uc = puc;
1322	uintptr_t ip;
1323	int is_write = 0;
1324
1325	ip = uc->uc_mcontext.sc_ip;
1326	switch (host_signum) {
1327	case SIGILL:
1328	case SIGFPE:
1329	case SIGSEGV:
1330	case SIGBUS:
1331	case SIGTRAP:
1332	if (info->si_code && (info->si_segvflags & __ISR_VALID))
1333	/* ISR.W (write-access) is bit 33: */
1334	is_write = (info->si_isr >> 33) & 1;
1335	break;
1336
1337	default:
1338	break;
1339	}
1340	return handle_cpu_signal(ip, (uintptr_t)info->si_addr,
1341	is_write,
1342	(sigset_t *)&uc->uc_sigmask, puc);
1343	}
1344
1345	#elif defined(__s390__)
1346
1347	int cpu_signal_handler(int host_signum, void *pinfo,
1348	void *puc)
1349	{
1350	siginfo_t *info = pinfo;
1351	struct ucontext *uc = puc;
1352	uintptr_t pc;
1353	uint16_t *pinsn;
1354	int is_write = 0;
1355
1356	pc = uc->uc_mcontext.psw.addr;
1357
1358	/* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
1359	of the normal 2 arguments. The 3rd argument contains the "int_code"
1360	from the hardware which does in fact contain the is_write value.
1361	The rt signal handler, as far as I can tell, does not give this value
1362	at all. Not that we could get to it from here even if it were. */
1363	/* ??? This is not even close to complete, since it ignores all
1364	of the read-modify-write instructions. */
1365	pinsn = (uint16_t *)pc;
1366	switch (pinsn[0] >> 8) {
1367	case 0x50: /* ST */
1368	case 0x42: /* STC */
1369	case 0x40: /* STH */
1370	is_write = 1;
1371	break;
1372	case 0xc4: /* RIL format insns */
1373	switch (pinsn[0] & 0xf) {
1374	case 0xf: /* STRL */
1375	case 0xb: /* STGRL */
1376	case 0x7: /* STHRL */
1377	is_write = 1;
1378	}
1379	break;
1380	case 0xe3: /* RXY format insns */
1381	switch (pinsn[2] & 0xff) {
1382	case 0x50: /* STY */
1383	case 0x24: /* STG */
1384	case 0x72: /* STCY */
1385	case 0x70: /* STHY */
1386	case 0x8e: /* STPQ */
1387	case 0x3f: /* STRVH */
1388	case 0x3e: /* STRV */
1389	case 0x2f: /* STRVG */
1390	is_write = 1;
1391	}
1392	break;
1393	}
1394	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1395	is_write, &uc->uc_sigmask, puc);
1396	}
1397
1398	#elif defined(__mips__)
1399
1400	int cpu_signal_handler(int host_signum, void *pinfo,
1401	void *puc)
1402	{
1403	siginfo_t *info = pinfo;
1404	struct ucontext *uc = puc;
1405	greg_t pc = uc->uc_mcontext.pc;
1406	int is_write;
1407
1408	/* XXX: compute is_write */
1409	is_write = 0;
1410	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1411	is_write, &uc->uc_sigmask, puc);
1412	}
1413
1414	#elif defined(__hppa__)
1415
1416	int cpu_signal_handler(int host_signum, void *pinfo,
1417	void *puc)
1418	{
1419	struct siginfo *info = pinfo;
1420	struct ucontext *uc = puc;
1421	uintptr_t pc = uc->uc_mcontext.sc_iaoq[0];
1422	uint32_t insn = (uint32_t )pc;
1423	int is_write = 0;
1424
1425	/* XXX: need kernel patch to get write flag faster. */
1426	switch (insn >> 26) {
1427	case 0x1a: /* STW */
1428	case 0x19: /* STH */
1429	case 0x18: /* STB */
1430	case 0x1b: /* STWM */
1431	is_write = 1;
1432	break;
1433
1434	case 0x09: /* CSTWX, FSTWX, FSTWS */
1435	case 0x0b: /* CSTDX, FSTDX, FSTDS */
1436	/* Distinguish from coprocessor load ... */
1437	is_write = (insn >> 9) & 1;
1438	break;
1439
1440	case 0x03:
1441	switch ((insn >> 6) & 15) {
1442	case 0xa: /* STWS */
1443	case 0x9: /* STHS */
1444	case 0x8: /* STBS */
1445	case 0xe: /* STWAS */
1446	case 0xc: /* STBYS */
1447	is_write = 1;
1448	}
1449	break;
1450	}
1451
1452	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1453	is_write, &uc->uc_sigmask, puc);
1454	}
1455
1456	#else
1457
1458	#error host CPU specific signal handler needed
1459
1460	#endif
1461
1462	#endif /* !defined(CONFIG_SOFTMMU) */

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