cpu-exec.c@ 80268

最後變更在這個檔案從80268是 72493,由 vboxsync 提交於 6 年前
IEM,REM,++: Removed code related IEM_VERIFICATION_MODE and friends because it (1) adds aditional complexity and mess, (2) suffers bit rot as it's infrequently used, and (3) prevents using pVCpu->cpum.GstCtx directly.
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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	/* successfully delivered */
353	env->old_exception = -1;
354	# ifdef VBOX
355	RAWEx_ProfileStop(env, STATS_IRQ_HANDLING);
356	# endif /* VBOX */
357	#elif defined(TARGET_PPC)
358	do_interrupt(env);
359	#elif defined(TARGET_MICROBLAZE)
360	do_interrupt(env);
361	#elif defined(TARGET_MIPS)
362	do_interrupt(env);
363	#elif defined(TARGET_SPARC)
364	do_interrupt(env);
365	#elif defined(TARGET_ARM)
366	do_interrupt(env);
367	#elif defined(TARGET_SH4)
368	do_interrupt(env);
369	#elif defined(TARGET_ALPHA)
370	do_interrupt(env);
371	#elif defined(TARGET_CRIS)
372	do_interrupt(env);
373	#elif defined(TARGET_M68K)
374	do_interrupt(0);
375	#endif
376	env->exception_index = -1;
377	#endif
378	}
379	}
380
381	# ifndef VBOX
382	if (kvm_enabled()) {
383	kvm_cpu_exec(env);
384	longjmp(env->jmp_env, 1);
385	}
386	# endif /* !VBOX */
387
388	next_tb = 0; /* force lookup of first TB */
389	for(;;) {
390	interrupt_request = env->interrupt_request;
391	if (unlikely(interrupt_request)) {
392	if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
393	/* Mask out external interrupts for this step. */
394	interrupt_request &= ~(CPU_INTERRUPT_HARD \|
395	CPU_INTERRUPT_FIQ \|
396	CPU_INTERRUPT_SMI \|
397	CPU_INTERRUPT_NMI);
398	}
399	if (interrupt_request & CPU_INTERRUPT_DEBUG) {
400	env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
401	env->exception_index = EXCP_DEBUG;
402	cpu_loop_exit();
403	}
404	#if defined(TARGET_ARM) \|\| defined(TARGET_SPARC) \|\| defined(TARGET_MIPS) \|\| \
405	defined(TARGET_PPC) \|\| defined(TARGET_ALPHA) \|\| defined(TARGET_CRIS) \|\| \
406	defined(TARGET_MICROBLAZE)
407	if (interrupt_request & CPU_INTERRUPT_HALT) {
408	env->interrupt_request &= ~CPU_INTERRUPT_HALT;
409	env->halted = 1;
410	env->exception_index = EXCP_HLT;
411	cpu_loop_exit();
412	}
413	#endif
414	#if defined(TARGET_I386)
415	# ifdef VBOX
416	/* Memory registration may post a tlb flush request, process it ASAP. */
417	if (interrupt_request & (CPU_INTERRUPT_EXTERNAL_FLUSH_TLB)) {
418	tlb_flush(env, true); /* (clears the flush flag) */
419	}
420
421	/* Single instruction exec request, we execute it and return (one way or the other).
422	The caller will always reschedule after doing this operation! */
423	if (interrupt_request & CPU_INTERRUPT_SINGLE_INSTR)
424	{
425	/* not in flight are we? (if we are, we trapped) */
426	if (!(env->interrupt_request & CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT))
427	{
428	ASMAtomicOrS32((int32_t volatile *)&env->interrupt_request, CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT);
429	env->exception_index = EXCP_SINGLE_INSTR;
430	if (emulate_single_instr(env) == -1)
431	AssertMsgFailed(("REM: emulate_single_instr failed for EIP=%RGv!!\n", (RTGCPTR)env->eip));
432
433	/* When we receive an external interrupt during execution of this single
434	instruction, then we should stay here. We will leave when we're ready
435	for raw-mode or when interrupted by pending EMT requests. */
436	interrupt_request = env->interrupt_request; /* reload this! */
437	if ( !(interrupt_request & CPU_INTERRUPT_HARD)
438	\|\| !(env->eflags & IF_MASK)
439	\|\| (env->hflags & HF_INHIBIT_IRQ_MASK)
440	\|\| (env->state & CPU_RAW_HM)
441	)
442	{
443	env->exception_index = ret = EXCP_SINGLE_INSTR;
444	cpu_loop_exit();
445	}
446	}
447	/* Clear CPU_INTERRUPT_SINGLE_INSTR and leave CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT set. */
448	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_SINGLE_INSTR);
449	}
450	# endif /* VBOX */
451
452	# ifndef VBOX /** @todo reconcile our code with the following... */
453	if (interrupt_request & CPU_INTERRUPT_INIT) {
454	svm_check_intercept(SVM_EXIT_INIT);
455	do_cpu_init(env);
456	env->exception_index = EXCP_HALTED;
457	cpu_loop_exit();
458	} else if (interrupt_request & CPU_INTERRUPT_SIPI) {
459	do_cpu_sipi(env);
460	} else if (env->hflags2 & HF2_GIF_MASK) {
461	if ((interrupt_request & CPU_INTERRUPT_SMI) &&
462	!(env->hflags & HF_SMM_MASK)) {
463	svm_check_intercept(SVM_EXIT_SMI);
464	env->interrupt_request &= ~CPU_INTERRUPT_SMI;
465	do_smm_enter();
466	next_tb = 0;
467	} else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
468	!(env->hflags2 & HF2_NMI_MASK)) {
469	env->interrupt_request &= ~CPU_INTERRUPT_NMI;
470	env->hflags2 \|= HF2_NMI_MASK;
471	do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
472	next_tb = 0;
473	} else if (interrupt_request & CPU_INTERRUPT_MCE) {
474	env->interrupt_request &= ~CPU_INTERRUPT_MCE;
475	do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
476	next_tb = 0;
477	} else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
478	(((env->hflags2 & HF2_VINTR_MASK) &&
479	(env->hflags2 & HF2_HIF_MASK)) \|\|
480	(!(env->hflags2 & HF2_VINTR_MASK) &&
481	(env->eflags & IF_MASK &&
482	!(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
483	int intno;
484	svm_check_intercept(SVM_EXIT_INTR);
485	env->interrupt_request &= ~(CPU_INTERRUPT_HARD \| CPU_INTERRUPT_VIRQ);
486	intno = cpu_get_pic_interrupt(env);
487	qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
488	#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
489	#undef env
490	env = cpu_single_env;
491	#define env cpu_single_env
492	#endif
493	do_interrupt(intno, 0, 0, 0, 1);
494	/* ensure that no TB jump will be modified as
495	the program flow was changed */
496	next_tb = 0;
497	#if !defined(CONFIG_USER_ONLY)
498	} else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
499	(env->eflags & IF_MASK) &&
500	!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
501	int intno;
502	/* FIXME: this should respect TPR */
503	svm_check_intercept(SVM_EXIT_VINTR);
504	intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
505	qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
506	do_interrupt(intno, 0, 0, 0, 1);
507	env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
508	next_tb = 0;
509	#endif
510	}
511	}
512	# else /* VBOX */
513	RAWEx_ProfileStart(env, STATS_IRQ_HANDLING);
514	if ((interrupt_request & CPU_INTERRUPT_SMI) &&
515	!(env->hflags & HF_SMM_MASK)) {
516	env->interrupt_request &= ~CPU_INTERRUPT_SMI;
517	do_smm_enter();
518	next_tb = 0;
519	}
520	else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
521	(env->eflags & IF_MASK) &&
522	!(env->hflags & HF_INHIBIT_IRQ_MASK))
523	{
524	/* if hardware interrupt pending, we execute it */
525	int intno;
526	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_HARD);
527	intno = cpu_get_pic_interrupt(env);
528	if (intno >= 0)
529	{
530	Log(("do_interrupt %d\n", intno));
531	do_interrupt(intno, 0, 0, 0, 1);
532	}
533	/* ensure that no TB jump will be modified as
534	the program flow was changed */
535	next_tb = 0;
536	}
537	# endif /* VBOX */
538	#elif defined(TARGET_PPC)
539	#if 0
540	if ((interrupt_request & CPU_INTERRUPT_RESET)) {
541	cpu_reset(env);
542	}
543	#endif
544	if (interrupt_request & CPU_INTERRUPT_HARD) {
545	ppc_hw_interrupt(env);
546	if (env->pending_interrupts == 0)
547	env->interrupt_request &= ~CPU_INTERRUPT_HARD;
548	next_tb = 0;
549	}
550	#elif defined(TARGET_MICROBLAZE)
551	if ((interrupt_request & CPU_INTERRUPT_HARD)
552	&& (env->sregs[SR_MSR] & MSR_IE)
553	&& !(env->sregs[SR_MSR] & (MSR_EIP \| MSR_BIP))
554	&& !(env->iflags & (D_FLAG \| IMM_FLAG))) {
555	env->exception_index = EXCP_IRQ;
556	do_interrupt(env);
557	next_tb = 0;
558	}
559	#elif defined(TARGET_MIPS)
560	if ((interrupt_request & CPU_INTERRUPT_HARD) &&
561	(env->CP0_Status & env->CP0_Cause & CP0Ca_IP_mask) &&
562	(env->CP0_Status & (1 << CP0St_IE)) &&
563	!(env->CP0_Status & (1 << CP0St_EXL)) &&
564	!(env->CP0_Status & (1 << CP0St_ERL)) &&
565	!(env->hflags & MIPS_HFLAG_DM)) {
566	/* Raise it */
567	env->exception_index = EXCP_EXT_INTERRUPT;
568	env->error_code = 0;
569	do_interrupt(env);
570	next_tb = 0;
571	}
572	#elif defined(TARGET_SPARC)
573	if (interrupt_request & CPU_INTERRUPT_HARD) {
574	if (cpu_interrupts_enabled(env) &&
575	env->interrupt_index > 0) {
576	int pil = env->interrupt_index & 0xf;
577	int type = env->interrupt_index & 0xf0;
578
579	if (((type == TT_EXTINT) &&
580	cpu_pil_allowed(env, pil)) \|\|
581	type != TT_EXTINT) {
582	env->exception_index = env->interrupt_index;
583	do_interrupt(env);
584	next_tb = 0;
585	}
586	}
587	} else if (interrupt_request & CPU_INTERRUPT_TIMER) {
588	//do_interrupt(0, 0, 0, 0, 0);
589	env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
590	}
591	#elif defined(TARGET_ARM)
592	if (interrupt_request & CPU_INTERRUPT_FIQ
593	&& !(env->uncached_cpsr & CPSR_F)) {
594	env->exception_index = EXCP_FIQ;
595	do_interrupt(env);
596	next_tb = 0;
597	}
598	/* ARMv7-M interrupt return works by loading a magic value
599	into the PC. On real hardware the load causes the
600	return to occur. The qemu implementation performs the
601	jump normally, then does the exception return when the
602	CPU tries to execute code at the magic address.
603	This will cause the magic PC value to be pushed to
604	the stack if an interrupt occured at the wrong time.
605	We avoid this by disabling interrupts when
606	pc contains a magic address. */
607	if (interrupt_request & CPU_INTERRUPT_HARD
608	&& ((IS_M(env) && env->regs[15] < 0xfffffff0)
609	\|\| !(env->uncached_cpsr & CPSR_I))) {
610	env->exception_index = EXCP_IRQ;
611	do_interrupt(env);
612	next_tb = 0;
613	}
614	#elif defined(TARGET_SH4)
615	if (interrupt_request & CPU_INTERRUPT_HARD) {
616	do_interrupt(env);
617	next_tb = 0;
618	}
619	#elif defined(TARGET_ALPHA)
620	if (interrupt_request & CPU_INTERRUPT_HARD) {
621	do_interrupt(env);
622	next_tb = 0;
623	}
624	#elif defined(TARGET_CRIS)
625	if (interrupt_request & CPU_INTERRUPT_HARD
626	&& (env->pregs[PR_CCS] & I_FLAG)
627	&& !env->locked_irq) {
628	env->exception_index = EXCP_IRQ;
629	do_interrupt(env);
630	next_tb = 0;
631	}
632	if (interrupt_request & CPU_INTERRUPT_NMI
633	&& (env->pregs[PR_CCS] & M_FLAG)) {
634	env->exception_index = EXCP_NMI;
635	do_interrupt(env);
636	next_tb = 0;
637	}
638	#elif defined(TARGET_M68K)
639	if (interrupt_request & CPU_INTERRUPT_HARD
640	&& ((env->sr & SR_I) >> SR_I_SHIFT)
641	< env->pending_level) {
642	/* Real hardware gets the interrupt vector via an
643	IACK cycle at this point. Current emulated
644	hardware doesn't rely on this, so we
645	provide/save the vector when the interrupt is
646	first signalled. */
647	env->exception_index = env->pending_vector;
648	do_interrupt(1);
649	next_tb = 0;
650	}
651	#endif
652	/* Don't use the cached interupt_request value,
653	do_interrupt may have updated the EXITTB flag. */
654	if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
655	#ifndef VBOX
656	env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
657	#else /* VBOX */
658	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_EXITTB);
659	#endif /* VBOX */
660	/* ensure that no TB jump will be modified as
661	the program flow was changed */
662	next_tb = 0;
663	}
664	#ifdef VBOX
665	RAWEx_ProfileStop(env, STATS_IRQ_HANDLING);
666	if (interrupt_request & CPU_INTERRUPT_RC) {
667	env->exception_index = EXCP_RC;
668	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_RC);
669	ret = env->exception_index;
670	cpu_loop_exit();
671	}
672	if (interrupt_request & (CPU_INTERRUPT_EXTERNAL_EXIT)) {
673	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~(CPU_INTERRUPT_EXTERNAL_EXIT));
674	env->exit_request = 1;
675	}
676	#endif
677	}
678	if (unlikely(env->exit_request)) {
679	env->exit_request = 0;
680	env->exception_index = EXCP_INTERRUPT;
681	cpu_loop_exit();
682	}
683
684	#ifdef VBOX
685	/*
686	* Check if we the CPU state allows us to execute the code in raw-mode.
687	*/
688	RAWEx_ProfileStart(env, STATS_RAW_CHECK);
689	if (remR3CanExecuteRaw(env,
690	env->eip + env->segs[R_CS].base,
691	env->hflags \| (env->eflags & (IOPL_MASK \| TF_MASK \| VM_MASK)),
692	&env->exception_index))
693	{
694	RAWEx_ProfileStop(env, STATS_RAW_CHECK);
695	ret = env->exception_index;
696	cpu_loop_exit();
697	}
698	RAWEx_ProfileStop(env, STATS_RAW_CHECK);
699	#endif /* VBOX */
700
701	#if defined(DEBUG_DISAS) \|\| defined(CONFIG_DEBUG_EXEC)
702	if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
703	/* restore flags in standard format */
704	#if defined(TARGET_I386)
705	env->eflags = env->eflags \| helper_cc_compute_all(CC_OP) \| (DF & DF_MASK);
706	log_cpu_state(env, X86_DUMP_CCOP);
707	env->eflags &= ~(DF_MASK \| CC_O \| CC_S \| CC_Z \| CC_A \| CC_P \| CC_C);
708	#elif defined(TARGET_M68K)
709	cpu_m68k_flush_flags(env, env->cc_op);
710	env->cc_op = CC_OP_FLAGS;
711	env->sr = (env->sr & 0xffe0)
712	\| env->cc_dest \| (env->cc_x << 4);
713	log_cpu_state(env, 0);
714	#else
715	log_cpu_state(env, 0);
716	#endif
717	}
718	#endif /* DEBUG_DISAS \|\| CONFIG_DEBUG_EXEC */
719	#ifdef VBOX
720	RAWEx_ProfileStart(env, STATS_TLB_LOOKUP);
721	#endif /VBOX/
722	spin_lock(&tb_lock);
723	tb = tb_find_fast();
724	/* Note: we do it here to avoid a gcc bug on Mac OS X when
725	doing it in tb_find_slow */
726	if (tb_invalidated_flag) {
727	/* as some TB could have been invalidated because
728	of memory exceptions while generating the code, we
729	must recompute the hash index here */
730	next_tb = 0;
731	tb_invalidated_flag = 0;
732	}
733	#ifdef CONFIG_DEBUG_EXEC
734	qemu_log_mask(CPU_LOG_EXEC, "Trace %p [" TARGET_FMT_lx "] %s\n",
735	(void *)tb->tc_ptr, tb->pc,
736	lookup_symbol(tb->pc));
737	#endif
738	/* see if we can patch the calling TB. When the TB
739	spans two pages, we cannot safely do a direct
740	jump. */
741	#ifndef VBOX
742	if (next_tb != 0 && tb->page_addr[1] == -1) {
743	#else /* VBOX */
744	if (next_tb != 0 && !(tb->cflags & CF_RAW_MODE) && tb->page_addr[1] == -1) {
745	#endif /* VBOX */
746	tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
747	}
748	spin_unlock(&tb_lock);
749	#ifdef VBOX
750	RAWEx_ProfileStop(env, STATS_TLB_LOOKUP);
751	#endif
752
753	/* cpu_interrupt might be called while translating the
754	TB, but before it is linked into a potentially
755	infinite loop and becomes env->current_tb. Avoid
756	starting execution if there is a pending interrupt. */
757	env->current_tb = tb;
758	barrier();
759	if (likely(!env->exit_request)) {
760	tc_ptr = tb->tc_ptr;
761	/* execute the generated code */
762	#ifdef VBOX
763	RAWEx_ProfileStart(env, STATS_QEMU_RUN_EMULATED_CODE);
764	#endif
765	#if defined(__sparc__) && !defined(CONFIG_SOLARIS)
766	#undef env
767	env = cpu_single_env;
768	#define env cpu_single_env
769	#endif
770	Log5(("REM: tb=%p tc_ptr=%p %04x:%08RGv\n", tb, tc_ptr, env->segs[R_CS].selector, (RTGCPTR)env->eip));
771	#if defined(VBOX) && defined(GCC_WITH_BUGGY_REGPARM)
772	tcg_qemu_tb_exec(tc_ptr, next_tb);
773	#else
774	next_tb = tcg_qemu_tb_exec(tc_ptr);
775	#endif
776	if (next_tb)
777	Log5(("REM: next_tb=%p %04x:%08RGv\n", next_tb, env->segs[R_CS].selector, (RTGCPTR)env->eip));
778	#ifdef VBOX
779	RAWEx_ProfileStop(env, STATS_QEMU_RUN_EMULATED_CODE);
780	#endif
781	if ((next_tb & 3) == 2) {
782	/* Instruction counter expired. */
783	int insns_left;
784	tb = (TranslationBlock *)(uintptr_t)(next_tb & ~3);
785	/* Restore PC. */
786	cpu_pc_from_tb(env, tb);
787	insns_left = env->icount_decr.u32;
788	if (env->icount_extra && insns_left >= 0) {
789	/* Refill decrementer and continue execution. */
790	env->icount_extra += insns_left;
791	if (env->icount_extra > 0xffff) {
792	insns_left = 0xffff;
793	} else {
794	insns_left = env->icount_extra;
795	}
796	env->icount_extra -= insns_left;
797	env->icount_decr.u16.low = insns_left;
798	} else {
799	if (insns_left > 0) {
800	/* Execute remaining instructions. */
801	cpu_exec_nocache(insns_left, tb);
802	}
803	env->exception_index = EXCP_INTERRUPT;
804	next_tb = 0;
805	cpu_loop_exit();
806	}
807	}
808	}
809	env->current_tb = NULL;
810	/* reset soft MMU for next block (it can currently
811	only be set by a memory fault) */
812	} /* for(;;) */
813	}
814	#ifdef VBOX_HIGH_RES_TIMERS_HACK
815	/* NULL the current_tb here so cpu_interrupt() doesn't do anything
816	unnecessary (like crashing during emulate single instruction).
817	Note! Don't use env1->pVM here, the code wouldn't run with
818	gcc-4.4/amd64 anymore, see #3883. */
819	env->current_tb = NULL;
820	if ( !(env->interrupt_request & ( CPU_INTERRUPT_DEBUG \| CPU_INTERRUPT_EXTERNAL_EXIT \| CPU_INTERRUPT_RC
821	\| CPU_INTERRUPT_SINGLE_INSTR \| CPU_INTERRUPT_SINGLE_INSTR_IN_FLIGHT))
822	&& ( (env->interrupt_request & CPU_INTERRUPT_EXTERNAL_TIMER)
823	\|\| TMTimerPollBool(env->pVM, env->pVCpu)) ) {
824	ASMAtomicAndS32((int32_t volatile *)&env->interrupt_request, ~CPU_INTERRUPT_EXTERNAL_TIMER);
825	remR3ProfileStart(STATS_QEMU_RUN_TIMERS);
826	TMR3TimerQueuesDo(env->pVM);
827	remR3ProfileStop(STATS_QEMU_RUN_TIMERS);
828	}
829	#endif
830	} /* for(;;) */
831
832
833	#if defined(TARGET_I386)
834	/* restore flags in standard format */
835	env->eflags = env->eflags \| helper_cc_compute_all(CC_OP) \| (DF & DF_MASK);
836	#elif defined(TARGET_ARM)
837	/* XXX: Save/restore host fpu exception state?. */
838	#elif defined(TARGET_SPARC)
839	#elif defined(TARGET_PPC)
840	#elif defined(TARGET_M68K)
841	cpu_m68k_flush_flags(env, env->cc_op);
842	env->cc_op = CC_OP_FLAGS;
843	env->sr = (env->sr & 0xffe0)
844	\| env->cc_dest \| (env->cc_x << 4);
845	#elif defined(TARGET_MICROBLAZE)
846	#elif defined(TARGET_MIPS)
847	#elif defined(TARGET_SH4)
848	#elif defined(TARGET_ALPHA)
849	#elif defined(TARGET_CRIS)
850	#elif defined(TARGET_S390X)
851	/* XXXXX */
852	#else
853	#error unsupported target CPU
854	#endif
855
856	/* restore global registers */
857	barrier();
858	env = (void *) saved_env_reg;
859
860	# ifndef VBOX /* we might be using elsewhere, we only have one. */
861	/* fail safe : never use cpu_single_env outside cpu_exec() */
862	cpu_single_env = NULL;
863	# endif
864	return ret;
865	}
866
867	/* must only be called from the generated code as an exception can be
868	generated */
869	void tb_invalidate_page_range(target_ulong start, target_ulong end)
870	{
871	/* XXX: cannot enable it yet because it yields to MMU exception
872	where NIP != read address on PowerPC */
873	#if 0
874	target_ulong phys_addr;
875	phys_addr = get_phys_addr_code(env, start);
876	tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
877	#endif
878	}
879
880	#if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
881
882	void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
883	{
884	CPUX86State *saved_env;
885
886	saved_env = env;
887	env = s;
888	if (!(env->cr[0] & CR0_PE_MASK) \|\| (env->eflags & VM_MASK)) {
889	selector &= 0xffff;
890	cpu_x86_load_seg_cache(env, seg_reg, selector,
891	(selector << 4), 0xffff, 0);
892	} else {
893	helper_load_seg(seg_reg, selector);
894	}
895	env = saved_env;
896	}
897
898	void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
899	{
900	CPUX86State *saved_env;
901
902	saved_env = env;
903	env = s;
904
905	helper_fsave(ptr, data32);
906
907	env = saved_env;
908	}
909
910	void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
911	{
912	CPUX86State *saved_env;
913
914	saved_env = env;
915	env = s;
916
917	helper_frstor(ptr, data32);
918
919	env = saved_env;
920	}
921
922	#endif /* TARGET_I386 */
923
924	#if !defined(CONFIG_SOFTMMU)
925
926	#if defined(TARGET_I386)
927	#define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
928	#else
929	#define EXCEPTION_ACTION cpu_loop_exit()
930	#endif
931
932	/* 'pc' is the host PC at which the exception was raised. 'address' is
933	the effective address of the memory exception. 'is_write' is 1 if a
934	write caused the exception and otherwise 0'. 'old_set' is the
935	signal set which should be restored */
936	static inline int handle_cpu_signal(uintptr_t pc, uintptr_t address,
937	int is_write, sigset_t *old_set,
938	void *puc)
939	{
940	TranslationBlock *tb;
941	int ret;
942
943	if (cpu_single_env)
944	env = cpu_single_env; /* XXX: find a correct solution for multithread */
945	#if defined(DEBUG_SIGNAL)
946	qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
947	pc, address, is_write, (unsigned long )old_set);
948	#endif
949	/* XXX: locking issue */
950	if (is_write && page_unprotect(h2g(address), pc, puc)) {
951	return 1;
952	}
953
954	/* see if it is an MMU fault */
955	ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
956	if (ret < 0)
957	return 0; /* not an MMU fault */
958	if (ret == 0)
959	return 1; /* the MMU fault was handled without causing real CPU fault */
960	/* now we have a real cpu fault */
961	tb = tb_find_pc(pc);
962	if (tb) {
963	/* the PC is inside the translated code. It means that we have
964	a virtual CPU fault */
965	cpu_restore_state(tb, env, pc, puc);
966	}
967
968	/* we restore the process signal mask as the sigreturn should
969	do it (XXX: use sigsetjmp) */
970	sigprocmask(SIG_SETMASK, old_set, NULL);
971	EXCEPTION_ACTION;
972
973	/* never comes here */
974	return 1;
975	}
976
977	#if defined(__i386__)
978
979	#if defined(__APPLE__)
980	# include <sys/ucontext.h>
981
982	# define EIP_sig(context) (((unsigned long)&(context)->uc_mcontext->ss.eip))
983	# define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
984	# define ERROR_sig(context) ((context)->uc_mcontext->es.err)
985	# define MASK_sig(context) ((context)->uc_sigmask)
986	#elif defined (__NetBSD__)
987	# include <ucontext.h>
988
989	# define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
990	# define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
991	# define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
992	# define MASK_sig(context) ((context)->uc_sigmask)
993	#elif defined (__FreeBSD__) \|\| defined(__DragonFly__)
994	# include <ucontext.h>
995
996	# define EIP_sig(context) (((unsigned long)&(context)->uc_mcontext.mc_eip))
997	# define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
998	# define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
999	# define MASK_sig(context) ((context)->uc_sigmask)
1000	#elif defined(__OpenBSD__)
1001	# define EIP_sig(context) ((context)->sc_eip)
1002	# define TRAP_sig(context) ((context)->sc_trapno)
1003	# define ERROR_sig(context) ((context)->sc_err)
1004	# define MASK_sig(context) ((context)->sc_mask)
1005	#else
1006	# define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
1007	# define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
1008	# define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
1009	# define MASK_sig(context) ((context)->uc_sigmask)
1010	#endif
1011
1012	int cpu_signal_handler(int host_signum, void *pinfo,
1013	void *puc)
1014	{
1015	siginfo_t *info = pinfo;
1016	#if defined(__NetBSD__) \|\| defined (__FreeBSD__) \|\| defined(__DragonFly__)
1017	ucontext_t *uc = puc;
1018	#elif defined(__OpenBSD__)
1019	struct sigcontext *uc = puc;
1020	#else
1021	struct ucontext *uc = puc;
1022	#endif
1023	uintptr_t pc;
1024	int trapno;
1025
1026	#ifndef REG_EIP
1027	/* for glibc 2.1 */
1028	#define REG_EIP EIP
1029	#define REG_ERR ERR
1030	#define REG_TRAPNO TRAPNO
1031	#endif
1032	pc = EIP_sig(uc);
1033	trapno = TRAP_sig(uc);
1034	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1035	trapno == 0xe ?
1036	(ERROR_sig(uc) >> 1) & 1 : 0,
1037	&MASK_sig(uc), puc);
1038	}
1039
1040	#elif defined(__x86_64__)
1041
1042	#ifdef __NetBSD__
1043	#define PC_sig(context) _UC_MACHINE_PC(context)
1044	#define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
1045	#define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
1046	#define MASK_sig(context) ((context)->uc_sigmask)
1047	#elif defined(__OpenBSD__)
1048	#define PC_sig(context) ((context)->sc_rip)
1049	#define TRAP_sig(context) ((context)->sc_trapno)
1050	#define ERROR_sig(context) ((context)->sc_err)
1051	#define MASK_sig(context) ((context)->sc_mask)
1052	#elif defined (__FreeBSD__) \|\| defined(__DragonFly__)
1053	#include <ucontext.h>
1054
1055	#define PC_sig(context) (((unsigned long)&(context)->uc_mcontext.mc_rip))
1056	#define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
1057	#define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
1058	#define MASK_sig(context) ((context)->uc_sigmask)
1059	#else
1060	#define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
1061	#define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
1062	#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
1063	#define MASK_sig(context) ((context)->uc_sigmask)
1064	#endif
1065
1066	int cpu_signal_handler(int host_signum, void *pinfo,
1067	void *puc)
1068	{
1069	siginfo_t *info = pinfo;
1070	uintptr_t pc;
1071	#if defined(__NetBSD__) \|\| defined (__FreeBSD__) \|\| defined(__DragonFly__)
1072	ucontext_t *uc = puc;
1073	#elif defined(__OpenBSD__)
1074	struct sigcontext *uc = puc;
1075	#else
1076	struct ucontext *uc = puc;
1077	#endif
1078
1079	pc = PC_sig(uc);
1080	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1081	TRAP_sig(uc) == 0xe ?
1082	(ERROR_sig(uc) >> 1) & 1 : 0,
1083	&MASK_sig(uc), puc);
1084	}
1085
1086	#elif defined(_ARCH_PPC)
1087
1088	/***********************************************************************
1089	* signal context platform-specific definitions
1090	* From Wine
1091	*/
1092	#ifdef linux
1093	/* All Registers access - only for local access */
1094	# define REG_sig(reg_name, context) ((context)->uc_mcontext.regs->reg_name)
1095	/* Gpr Registers access */
1096	# define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
1097	# define IAR_sig(context) REG_sig(nip, context) /* Program counter */
1098	# define MSR_sig(context) REG_sig(msr, context) /* Machine State Register (Supervisor) */
1099	# define CTR_sig(context) REG_sig(ctr, context) /* Count register */
1100	# define XER_sig(context) REG_sig(xer, context) /* User's integer exception register */
1101	# define LR_sig(context) REG_sig(link, context) /* Link register */
1102	# define CR_sig(context) REG_sig(ccr, context) /* Condition register */
1103	/* Float Registers access */
1104	# define FLOAT_sig(reg_num, context) (((double)((char)((context)->uc_mcontext.regs+48*4)))[reg_num])
1105	# define FPSCR_sig(context) ((int)((char)((context)->uc_mcontext.regs+(48+322)*4)))
1106	/* Exception Registers access */
1107	# define DAR_sig(context) REG_sig(dar, context)
1108	# define DSISR_sig(context) REG_sig(dsisr, context)
1109	# define TRAP_sig(context) REG_sig(trap, context)
1110	#endif /* linux */
1111
1112	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
1113	#include <ucontext.h>
1114	# define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
1115	# define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
1116	# define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
1117	# define XER_sig(context) ((context)->uc_mcontext.mc_xer)
1118	# define LR_sig(context) ((context)->uc_mcontext.mc_lr)
1119	# define CR_sig(context) ((context)->uc_mcontext.mc_cr)
1120	/* Exception Registers access */
1121	# define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
1122	# define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
1123	# define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
1124	#endif /* __FreeBSD__\|\| __FreeBSD_kernel__ */
1125
1126	#ifdef __APPLE__
1127	# include <sys/ucontext.h>
1128	typedef struct ucontext SIGCONTEXT;
1129	/* All Registers access - only for local access */
1130	# define REG_sig(reg_name, context) ((context)->uc_mcontext->ss.reg_name)
1131	# define FLOATREG_sig(reg_name, context) ((context)->uc_mcontext->fs.reg_name)
1132	# define EXCEPREG_sig(reg_name, context) ((context)->uc_mcontext->es.reg_name)
1133	# define VECREG_sig(reg_name, context) ((context)->uc_mcontext->vs.reg_name)
1134	/* Gpr Registers access */
1135	# define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
1136	# define IAR_sig(context) REG_sig(srr0, context) /* Program counter */
1137	# define MSR_sig(context) REG_sig(srr1, context) /* Machine State Register (Supervisor) */
1138	# define CTR_sig(context) REG_sig(ctr, context)
1139	# define XER_sig(context) REG_sig(xer, context) /* Link register */
1140	# define LR_sig(context) REG_sig(lr, context) /* User's integer exception register */
1141	# define CR_sig(context) REG_sig(cr, context) /* Condition register */
1142	/* Float Registers access */
1143	# define FLOAT_sig(reg_num, context) FLOATREG_sig(fpregs[reg_num], context)
1144	# define FPSCR_sig(context) ((double)FLOATREG_sig(fpscr, context))
1145	/* Exception Registers access */
1146	# define DAR_sig(context) EXCEPREG_sig(dar, context) /* Fault registers for coredump */
1147	# define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
1148	# define TRAP_sig(context) EXCEPREG_sig(exception, context) /* number of powerpc exception taken */
1149	#endif /* __APPLE__ */
1150
1151	int cpu_signal_handler(int host_signum, void *pinfo,
1152	void *puc)
1153	{
1154	siginfo_t *info = pinfo;
1155	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
1156	ucontext_t *uc = puc;
1157	#else
1158	struct ucontext *uc = puc;
1159	#endif
1160	uintptr_t pc;
1161	int is_write;
1162
1163	pc = IAR_sig(uc);
1164	is_write = 0;
1165	#if 0
1166	/* ppc 4xx case */
1167	if (DSISR_sig(uc) & 0x00800000)
1168	is_write = 1;
1169	#else
1170	if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000))
1171	is_write = 1;
1172	#endif
1173	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1174	is_write, &uc->uc_sigmask, puc);
1175	}
1176
1177	#elif defined(__alpha__)
1178
1179	int cpu_signal_handler(int host_signum, void *pinfo,
1180	void *puc)
1181	{
1182	siginfo_t *info = pinfo;
1183	struct ucontext *uc = puc;
1184	uint32_t *pc = uc->uc_mcontext.sc_pc;
1185	uint32_t insn = *pc;
1186	int is_write = 0;
1187
1188	/* XXX: need kernel patch to get write flag faster */
1189	switch (insn >> 26) {
1190	case 0x0d: // stw
1191	case 0x0e: // stb
1192	case 0x0f: // stq_u
1193	case 0x24: // stf
1194	case 0x25: // stg
1195	case 0x26: // sts
1196	case 0x27: // stt
1197	case 0x2c: // stl
1198	case 0x2d: // stq
1199	case 0x2e: // stl_c
1200	case 0x2f: // stq_c
1201	is_write = 1;
1202	}
1203
1204	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1205	is_write, &uc->uc_sigmask, puc);
1206	}
1207	#elif defined(__sparc__)
1208
1209	int cpu_signal_handler(int host_signum, void *pinfo,
1210	void *puc)
1211	{
1212	siginfo_t *info = pinfo;
1213	int is_write;
1214	uint32_t insn;
1215	#if !defined(__arch64__) \|\| defined(CONFIG_SOLARIS)
1216	uint32_t regs = (uint32_t )(info + 1);
1217	void *sigmask = (regs + 20);
1218	/* XXX: is there a standard glibc define ? */
1219	uintptr_t pc = regs[1];
1220	#else
1221	#ifdef __linux__
1222	struct sigcontext *sc = puc;
1223	uintptr_t pc = sc->sigc_regs.tpc;
1224	void sigmask = (void )sc->sigc_mask;
1225	#elif defined(__OpenBSD__)
1226	struct sigcontext *uc = puc;
1227	uintptr_t pc = uc->sc_pc;
1228	void sigmask = (void )(uintptr_t)uc->sc_mask;
1229	#endif
1230	#endif
1231
1232	/* XXX: need kernel patch to get write flag faster */
1233	is_write = 0;
1234	insn = (uint32_t )pc;
1235	if ((insn >> 30) == 3) {
1236	switch((insn >> 19) & 0x3f) {
1237	case 0x05: // stb
1238	case 0x15: // stba
1239	case 0x06: // sth
1240	case 0x16: // stha
1241	case 0x04: // st
1242	case 0x14: // sta
1243	case 0x07: // std
1244	case 0x17: // stda
1245	case 0x0e: // stx
1246	case 0x1e: // stxa
1247	case 0x24: // stf
1248	case 0x34: // stfa
1249	case 0x27: // stdf
1250	case 0x37: // stdfa
1251	case 0x26: // stqf
1252	case 0x36: // stqfa
1253	case 0x25: // stfsr
1254	case 0x3c: // casa
1255	case 0x3e: // casxa
1256	is_write = 1;
1257	break;
1258	}
1259	}
1260	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1261	is_write, sigmask, NULL);
1262	}
1263
1264	#elif defined(__arm__)
1265
1266	int cpu_signal_handler(int host_signum, void *pinfo,
1267	void *puc)
1268	{
1269	siginfo_t *info = pinfo;
1270	struct ucontext *uc = puc;
1271	uintptr_t pc;
1272	int is_write;
1273
1274	#if (__GLIBC__ < 2 \|\| (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
1275	pc = uc->uc_mcontext.gregs[R15];
1276	#else
1277	pc = uc->uc_mcontext.arm_pc;
1278	#endif
1279	/* XXX: compute is_write */
1280	is_write = 0;
1281	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1282	is_write,
1283	&uc->uc_sigmask, puc);
1284	}
1285
1286	#elif defined(__mc68000)
1287
1288	int cpu_signal_handler(int host_signum, void *pinfo,
1289	void *puc)
1290	{
1291	siginfo_t *info = pinfo;
1292	struct ucontext *uc = puc;
1293	uintptr_t pc;
1294	int is_write;
1295
1296	pc = uc->uc_mcontext.gregs[16];
1297	/* XXX: compute is_write */
1298	is_write = 0;
1299	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1300	is_write,
1301	&uc->uc_sigmask, puc);
1302	}
1303
1304	#elif defined(__ia64)
1305
1306	#ifndef __ISR_VALID
1307	/* This ought to be in <bits/siginfo.h>... */
1308	# define __ISR_VALID 1
1309	#endif
1310
1311	int cpu_signal_handler(int host_signum, void pinfo, void puc)
1312	{
1313	siginfo_t *info = pinfo;
1314	struct ucontext *uc = puc;
1315	uintptr_t ip;
1316	int is_write = 0;
1317
1318	ip = uc->uc_mcontext.sc_ip;
1319	switch (host_signum) {
1320	case SIGILL:
1321	case SIGFPE:
1322	case SIGSEGV:
1323	case SIGBUS:
1324	case SIGTRAP:
1325	if (info->si_code && (info->si_segvflags & __ISR_VALID))
1326	/* ISR.W (write-access) is bit 33: */
1327	is_write = (info->si_isr >> 33) & 1;
1328	break;
1329
1330	default:
1331	break;
1332	}
1333	return handle_cpu_signal(ip, (uintptr_t)info->si_addr,
1334	is_write,
1335	(sigset_t *)&uc->uc_sigmask, puc);
1336	}
1337
1338	#elif defined(__s390__)
1339
1340	int cpu_signal_handler(int host_signum, void *pinfo,
1341	void *puc)
1342	{
1343	siginfo_t *info = pinfo;
1344	struct ucontext *uc = puc;
1345	uintptr_t pc;
1346	uint16_t *pinsn;
1347	int is_write = 0;
1348
1349	pc = uc->uc_mcontext.psw.addr;
1350
1351	/* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
1352	of the normal 2 arguments. The 3rd argument contains the "int_code"
1353	from the hardware which does in fact contain the is_write value.
1354	The rt signal handler, as far as I can tell, does not give this value
1355	at all. Not that we could get to it from here even if it were. */
1356	/* ??? This is not even close to complete, since it ignores all
1357	of the read-modify-write instructions. */
1358	pinsn = (uint16_t *)pc;
1359	switch (pinsn[0] >> 8) {
1360	case 0x50: /* ST */
1361	case 0x42: /* STC */
1362	case 0x40: /* STH */
1363	is_write = 1;
1364	break;
1365	case 0xc4: /* RIL format insns */
1366	switch (pinsn[0] & 0xf) {
1367	case 0xf: /* STRL */
1368	case 0xb: /* STGRL */
1369	case 0x7: /* STHRL */
1370	is_write = 1;
1371	}
1372	break;
1373	case 0xe3: /* RXY format insns */
1374	switch (pinsn[2] & 0xff) {
1375	case 0x50: /* STY */
1376	case 0x24: /* STG */
1377	case 0x72: /* STCY */
1378	case 0x70: /* STHY */
1379	case 0x8e: /* STPQ */
1380	case 0x3f: /* STRVH */
1381	case 0x3e: /* STRV */
1382	case 0x2f: /* STRVG */
1383	is_write = 1;
1384	}
1385	break;
1386	}
1387	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1388	is_write, &uc->uc_sigmask, puc);
1389	}
1390
1391	#elif defined(__mips__)
1392
1393	int cpu_signal_handler(int host_signum, void *pinfo,
1394	void *puc)
1395	{
1396	siginfo_t *info = pinfo;
1397	struct ucontext *uc = puc;
1398	greg_t pc = uc->uc_mcontext.pc;
1399	int is_write;
1400
1401	/* XXX: compute is_write */
1402	is_write = 0;
1403	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1404	is_write, &uc->uc_sigmask, puc);
1405	}
1406
1407	#elif defined(__hppa__)
1408
1409	int cpu_signal_handler(int host_signum, void *pinfo,
1410	void *puc)
1411	{
1412	struct siginfo *info = pinfo;
1413	struct ucontext *uc = puc;
1414	uintptr_t pc = uc->uc_mcontext.sc_iaoq[0];
1415	uint32_t insn = (uint32_t )pc;
1416	int is_write = 0;
1417
1418	/* XXX: need kernel patch to get write flag faster. */
1419	switch (insn >> 26) {
1420	case 0x1a: /* STW */
1421	case 0x19: /* STH */
1422	case 0x18: /* STB */
1423	case 0x1b: /* STWM */
1424	is_write = 1;
1425	break;
1426
1427	case 0x09: /* CSTWX, FSTWX, FSTWS */
1428	case 0x0b: /* CSTDX, FSTDX, FSTDS */
1429	/* Distinguish from coprocessor load ... */
1430	is_write = (insn >> 9) & 1;
1431	break;
1432
1433	case 0x03:
1434	switch ((insn >> 6) & 15) {
1435	case 0xa: /* STWS */
1436	case 0x9: /* STHS */
1437	case 0x8: /* STBS */
1438	case 0xe: /* STWAS */
1439	case 0xc: /* STBYS */
1440	is_write = 1;
1441	}
1442	break;
1443	}
1444
1445	return handle_cpu_signal(pc, (uintptr_t)info->si_addr,
1446	is_write, &uc->uc_sigmask, puc);
1447	}
1448
1449	#else
1450
1451	#error host CPU specific signal handler needed
1452
1453	#endif
1454
1455	#endif /* !defined(CONFIG_SOFTMMU) */

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