2 * i386 emulator main execution loop
4 * Copyright (c) 2003-2005 Fabrice Bellard
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.
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.
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/>.
24 #include "qemu-barrier.h"
26 #if !defined(CONFIG_SOFTMMU)
38 #include <sys/ucontext.h>
42 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
43 // Work around ugly bugs in glibc that mangle global register contents
45 #define env cpu_single_env
48 int tb_invalidated_flag;
50 //#define CONFIG_DEBUG_EXEC
51 //#define DEBUG_SIGNAL
53 int qemu_cpu_has_work(CPUState *env)
55 return cpu_has_work(env);
58 void cpu_loop_exit(void)
60 env->current_tb = NULL;
61 longjmp(env->jmp_env, 1);
64 /* exit the current TB from a signal handler. The host registers are
65 restored in a state compatible with the CPU emulator
67 void cpu_resume_from_signal(CPUState *env1, void *puc)
69 #if !defined(CONFIG_SOFTMMU)
71 struct ucontext *uc = puc;
72 #elif defined(__OpenBSD__)
73 struct sigcontext *uc = puc;
79 /* XXX: restore cpu registers saved in host registers */
81 #if !defined(CONFIG_SOFTMMU)
83 /* XXX: use siglongjmp ? */
86 sigprocmask(SIG_SETMASK, (sigset_t *)&uc->uc_sigmask, NULL);
88 sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
90 #elif defined(__OpenBSD__)
91 sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
95 env->exception_index = -1;
96 longjmp(env->jmp_env, 1);
99 /* Execute the code without caching the generated code. An interpreter
100 could be used if available. */
101 static void cpu_exec_nocache(int max_cycles, TranslationBlock *orig_tb)
103 unsigned long next_tb;
104 TranslationBlock *tb;
106 /* Should never happen.
107 We only end up here when an existing TB is too long. */
108 if (max_cycles > CF_COUNT_MASK)
109 max_cycles = CF_COUNT_MASK;
111 tb = tb_gen_code(env, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
113 env->current_tb = tb;
114 /* execute the generated code */
115 next_tb = tcg_qemu_tb_exec(tb->tc_ptr);
116 env->current_tb = NULL;
118 if ((next_tb & 3) == 2) {
119 /* Restore PC. This may happen if async event occurs before
120 the TB starts executing. */
121 cpu_pc_from_tb(env, tb);
123 tb_phys_invalidate(tb, -1);
127 static TranslationBlock *tb_find_slow(target_ulong pc,
128 target_ulong cs_base,
131 TranslationBlock *tb, **ptb1;
133 tb_page_addr_t phys_pc, phys_page1, phys_page2;
134 target_ulong virt_page2;
136 tb_invalidated_flag = 0;
138 /* find translated block using physical mappings */
139 phys_pc = get_page_addr_code(env, pc);
140 phys_page1 = phys_pc & TARGET_PAGE_MASK;
142 h = tb_phys_hash_func(phys_pc);
143 ptb1 = &tb_phys_hash[h];
149 tb->page_addr[0] == phys_page1 &&
150 tb->cs_base == cs_base &&
151 tb->flags == flags) {
152 /* check next page if needed */
153 if (tb->page_addr[1] != -1) {
154 virt_page2 = (pc & TARGET_PAGE_MASK) +
156 phys_page2 = get_page_addr_code(env, virt_page2);
157 if (tb->page_addr[1] == phys_page2)
163 ptb1 = &tb->phys_hash_next;
166 /* if no translated code available, then translate it now */
167 tb = tb_gen_code(env, pc, cs_base, flags, 0);
170 /* Move the last found TB to the head of the list */
172 *ptb1 = tb->phys_hash_next;
173 tb->phys_hash_next = tb_phys_hash[h];
174 tb_phys_hash[h] = tb;
176 /* we add the TB in the virtual pc hash table */
177 env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;
181 static inline TranslationBlock *tb_find_fast(void)
183 TranslationBlock *tb;
184 target_ulong cs_base, pc;
187 /* we record a subset of the CPU state. It will
188 always be the same before a given translated block
190 cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
191 tb = env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)];
192 if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
193 tb->flags != flags)) {
194 tb = tb_find_slow(pc, cs_base, flags);
199 static CPUDebugExcpHandler *debug_excp_handler;
201 CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler)
203 CPUDebugExcpHandler *old_handler = debug_excp_handler;
205 debug_excp_handler = handler;
209 static void cpu_handle_debug_exception(CPUState *env)
213 if (!env->watchpoint_hit) {
214 QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
215 wp->flags &= ~BP_WATCHPOINT_HIT;
218 if (debug_excp_handler) {
219 debug_excp_handler(env);
223 /* main execution loop */
225 volatile sig_atomic_t exit_request;
227 int cpu_exec(CPUState *env1)
229 volatile host_reg_t saved_env_reg;
230 int ret, interrupt_request;
231 TranslationBlock *tb;
233 unsigned long next_tb;
236 if (!cpu_has_work(env1)) {
243 cpu_single_env = env1;
245 /* the access to env below is actually saving the global register's
246 value, so that files not including target-xyz/exec.h are free to
248 QEMU_BUILD_BUG_ON (sizeof (saved_env_reg) != sizeof (env));
249 saved_env_reg = (host_reg_t) env;
253 if (unlikely(exit_request)) {
254 env->exit_request = 1;
257 #if defined(TARGET_I386)
258 /* put eflags in CPU temporary format */
259 CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
260 DF = 1 - (2 * ((env->eflags >> 10) & 1));
261 CC_OP = CC_OP_EFLAGS;
262 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
263 #elif defined(TARGET_SPARC)
264 #elif defined(TARGET_M68K)
265 env->cc_op = CC_OP_FLAGS;
266 env->cc_dest = env->sr & 0xf;
267 env->cc_x = (env->sr >> 4) & 1;
268 #elif defined(TARGET_ALPHA)
269 #elif defined(TARGET_ARM)
270 #elif defined(TARGET_UNICORE32)
271 #elif defined(TARGET_PPC)
272 #elif defined(TARGET_LM32)
273 #elif defined(TARGET_MICROBLAZE)
274 #elif defined(TARGET_MIPS)
275 #elif defined(TARGET_SH4)
276 #elif defined(TARGET_CRIS)
277 #elif defined(TARGET_S390X)
280 #error unsupported target CPU
282 env->exception_index = -1;
284 /* prepare setjmp context for exception handling */
286 if (setjmp(env->jmp_env) == 0) {
287 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
289 env = cpu_single_env;
290 #define env cpu_single_env
292 /* if an exception is pending, we execute it here */
293 if (env->exception_index >= 0) {
294 if (env->exception_index >= EXCP_INTERRUPT) {
295 /* exit request from the cpu execution loop */
296 ret = env->exception_index;
297 if (ret == EXCP_DEBUG) {
298 cpu_handle_debug_exception(env);
302 #if defined(CONFIG_USER_ONLY)
303 /* if user mode only, we simulate a fake exception
304 which will be handled outside the cpu execution
306 #if defined(TARGET_I386)
307 do_interrupt_user(env->exception_index,
308 env->exception_is_int,
310 env->exception_next_eip);
311 /* successfully delivered */
312 env->old_exception = -1;
314 ret = env->exception_index;
317 #if defined(TARGET_I386)
318 /* simulate a real cpu exception. On i386, it can
319 trigger new exceptions, but we do not handle
320 double or triple faults yet. */
321 do_interrupt(env->exception_index,
322 env->exception_is_int,
324 env->exception_next_eip, 0);
325 /* successfully delivered */
326 env->old_exception = -1;
327 #elif defined(TARGET_PPC)
329 #elif defined(TARGET_LM32)
331 #elif defined(TARGET_MICROBLAZE)
333 #elif defined(TARGET_MIPS)
335 #elif defined(TARGET_SPARC)
337 #elif defined(TARGET_ARM)
339 #elif defined(TARGET_UNICORE32)
341 #elif defined(TARGET_SH4)
343 #elif defined(TARGET_ALPHA)
345 #elif defined(TARGET_CRIS)
347 #elif defined(TARGET_M68K)
350 env->exception_index = -1;
355 next_tb = 0; /* force lookup of first TB */
357 interrupt_request = env->interrupt_request;
358 if (unlikely(interrupt_request)) {
359 if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
360 /* Mask out external interrupts for this step. */
361 interrupt_request &= ~(CPU_INTERRUPT_HARD |
366 if (interrupt_request & CPU_INTERRUPT_DEBUG) {
367 env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
368 env->exception_index = EXCP_DEBUG;
371 #if defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_MIPS) || \
372 defined(TARGET_PPC) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || \
373 defined(TARGET_MICROBLAZE) || defined(TARGET_LM32) || defined(TARGET_UNICORE32)
374 if (interrupt_request & CPU_INTERRUPT_HALT) {
375 env->interrupt_request &= ~CPU_INTERRUPT_HALT;
377 env->exception_index = EXCP_HLT;
381 #if defined(TARGET_I386)
382 if (interrupt_request & CPU_INTERRUPT_INIT) {
383 svm_check_intercept(SVM_EXIT_INIT);
385 env->exception_index = EXCP_HALTED;
387 } else if (interrupt_request & CPU_INTERRUPT_SIPI) {
389 } else if (env->hflags2 & HF2_GIF_MASK) {
390 if ((interrupt_request & CPU_INTERRUPT_SMI) &&
391 !(env->hflags & HF_SMM_MASK)) {
392 svm_check_intercept(SVM_EXIT_SMI);
393 env->interrupt_request &= ~CPU_INTERRUPT_SMI;
396 } else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
397 !(env->hflags2 & HF2_NMI_MASK)) {
398 env->interrupt_request &= ~CPU_INTERRUPT_NMI;
399 env->hflags2 |= HF2_NMI_MASK;
400 do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
402 } else if (interrupt_request & CPU_INTERRUPT_MCE) {
403 env->interrupt_request &= ~CPU_INTERRUPT_MCE;
404 do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
406 } else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
407 (((env->hflags2 & HF2_VINTR_MASK) &&
408 (env->hflags2 & HF2_HIF_MASK)) ||
409 (!(env->hflags2 & HF2_VINTR_MASK) &&
410 (env->eflags & IF_MASK &&
411 !(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
413 svm_check_intercept(SVM_EXIT_INTR);
414 env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ);
415 intno = cpu_get_pic_interrupt(env);
416 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
417 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
419 env = cpu_single_env;
420 #define env cpu_single_env
422 do_interrupt(intno, 0, 0, 0, 1);
423 /* ensure that no TB jump will be modified as
424 the program flow was changed */
426 #if !defined(CONFIG_USER_ONLY)
427 } else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
428 (env->eflags & IF_MASK) &&
429 !(env->hflags & HF_INHIBIT_IRQ_MASK)) {
431 /* FIXME: this should respect TPR */
432 svm_check_intercept(SVM_EXIT_VINTR);
433 intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
434 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
435 do_interrupt(intno, 0, 0, 0, 1);
436 env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
441 #elif defined(TARGET_PPC)
443 if ((interrupt_request & CPU_INTERRUPT_RESET)) {
447 if (interrupt_request & CPU_INTERRUPT_HARD) {
448 ppc_hw_interrupt(env);
449 if (env->pending_interrupts == 0)
450 env->interrupt_request &= ~CPU_INTERRUPT_HARD;
453 #elif defined(TARGET_LM32)
454 if ((interrupt_request & CPU_INTERRUPT_HARD)
455 && (env->ie & IE_IE)) {
456 env->exception_index = EXCP_IRQ;
460 #elif defined(TARGET_MICROBLAZE)
461 if ((interrupt_request & CPU_INTERRUPT_HARD)
462 && (env->sregs[SR_MSR] & MSR_IE)
463 && !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
464 && !(env->iflags & (D_FLAG | IMM_FLAG))) {
465 env->exception_index = EXCP_IRQ;
469 #elif defined(TARGET_MIPS)
470 if ((interrupt_request & CPU_INTERRUPT_HARD) &&
471 cpu_mips_hw_interrupts_pending(env)) {
473 env->exception_index = EXCP_EXT_INTERRUPT;
478 #elif defined(TARGET_SPARC)
479 if (interrupt_request & CPU_INTERRUPT_HARD) {
480 if (cpu_interrupts_enabled(env) &&
481 env->interrupt_index > 0) {
482 int pil = env->interrupt_index & 0xf;
483 int type = env->interrupt_index & 0xf0;
485 if (((type == TT_EXTINT) &&
486 cpu_pil_allowed(env, pil)) ||
488 env->exception_index = env->interrupt_index;
493 } else if (interrupt_request & CPU_INTERRUPT_TIMER) {
494 //do_interrupt(0, 0, 0, 0, 0);
495 env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
497 #elif defined(TARGET_ARM)
498 if (interrupt_request & CPU_INTERRUPT_FIQ
499 && !(env->uncached_cpsr & CPSR_F)) {
500 env->exception_index = EXCP_FIQ;
504 /* ARMv7-M interrupt return works by loading a magic value
505 into the PC. On real hardware the load causes the
506 return to occur. The qemu implementation performs the
507 jump normally, then does the exception return when the
508 CPU tries to execute code at the magic address.
509 This will cause the magic PC value to be pushed to
510 the stack if an interrupt occured at the wrong time.
511 We avoid this by disabling interrupts when
512 pc contains a magic address. */
513 if (interrupt_request & CPU_INTERRUPT_HARD
514 && ((IS_M(env) && env->regs[15] < 0xfffffff0)
515 || !(env->uncached_cpsr & CPSR_I))) {
516 env->exception_index = EXCP_IRQ;
520 #elif defined(TARGET_UNICORE32)
521 if (interrupt_request & CPU_INTERRUPT_HARD
522 && !(env->uncached_asr & ASR_I)) {
526 #elif defined(TARGET_SH4)
527 if (interrupt_request & CPU_INTERRUPT_HARD) {
531 #elif defined(TARGET_ALPHA)
532 if (interrupt_request & CPU_INTERRUPT_HARD) {
536 #elif defined(TARGET_CRIS)
537 if (interrupt_request & CPU_INTERRUPT_HARD
538 && (env->pregs[PR_CCS] & I_FLAG)
539 && !env->locked_irq) {
540 env->exception_index = EXCP_IRQ;
544 if (interrupt_request & CPU_INTERRUPT_NMI
545 && (env->pregs[PR_CCS] & M_FLAG)) {
546 env->exception_index = EXCP_NMI;
550 #elif defined(TARGET_M68K)
551 if (interrupt_request & CPU_INTERRUPT_HARD
552 && ((env->sr & SR_I) >> SR_I_SHIFT)
553 < env->pending_level) {
554 /* Real hardware gets the interrupt vector via an
555 IACK cycle at this point. Current emulated
556 hardware doesn't rely on this, so we
557 provide/save the vector when the interrupt is
559 env->exception_index = env->pending_vector;
564 /* Don't use the cached interupt_request value,
565 do_interrupt may have updated the EXITTB flag. */
566 if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
567 env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
568 /* ensure that no TB jump will be modified as
569 the program flow was changed */
573 if (unlikely(env->exit_request)) {
574 env->exit_request = 0;
575 env->exception_index = EXCP_INTERRUPT;
578 #if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
579 if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
580 /* restore flags in standard format */
581 #if defined(TARGET_I386)
582 env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
583 log_cpu_state(env, X86_DUMP_CCOP);
584 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
585 #elif defined(TARGET_M68K)
586 cpu_m68k_flush_flags(env, env->cc_op);
587 env->cc_op = CC_OP_FLAGS;
588 env->sr = (env->sr & 0xffe0)
589 | env->cc_dest | (env->cc_x << 4);
590 log_cpu_state(env, 0);
592 log_cpu_state(env, 0);
595 #endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */
598 /* Note: we do it here to avoid a gcc bug on Mac OS X when
599 doing it in tb_find_slow */
600 if (tb_invalidated_flag) {
601 /* as some TB could have been invalidated because
602 of memory exceptions while generating the code, we
603 must recompute the hash index here */
605 tb_invalidated_flag = 0;
607 #ifdef CONFIG_DEBUG_EXEC
608 qemu_log_mask(CPU_LOG_EXEC, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n",
609 (long)tb->tc_ptr, tb->pc,
610 lookup_symbol(tb->pc));
612 /* see if we can patch the calling TB. When the TB
613 spans two pages, we cannot safely do a direct
615 if (next_tb != 0 && tb->page_addr[1] == -1) {
616 tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
618 spin_unlock(&tb_lock);
620 /* cpu_interrupt might be called while translating the
621 TB, but before it is linked into a potentially
622 infinite loop and becomes env->current_tb. Avoid
623 starting execution if there is a pending interrupt. */
624 env->current_tb = tb;
626 if (likely(!env->exit_request)) {
628 /* execute the generated code */
629 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
631 env = cpu_single_env;
632 #define env cpu_single_env
634 next_tb = tcg_qemu_tb_exec(tc_ptr);
635 if ((next_tb & 3) == 2) {
636 /* Instruction counter expired. */
638 tb = (TranslationBlock *)(long)(next_tb & ~3);
640 cpu_pc_from_tb(env, tb);
641 insns_left = env->icount_decr.u32;
642 if (env->icount_extra && insns_left >= 0) {
643 /* Refill decrementer and continue execution. */
644 env->icount_extra += insns_left;
645 if (env->icount_extra > 0xffff) {
648 insns_left = env->icount_extra;
650 env->icount_extra -= insns_left;
651 env->icount_decr.u16.low = insns_left;
653 if (insns_left > 0) {
654 /* Execute remaining instructions. */
655 cpu_exec_nocache(insns_left, tb);
657 env->exception_index = EXCP_INTERRUPT;
663 env->current_tb = NULL;
664 /* reset soft MMU for next block (it can currently
665 only be set by a memory fault) */
671 #if defined(TARGET_I386)
672 /* restore flags in standard format */
673 env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
674 #elif defined(TARGET_ARM)
675 /* XXX: Save/restore host fpu exception state?. */
676 #elif defined(TARGET_UNICORE32)
677 #elif defined(TARGET_SPARC)
678 #elif defined(TARGET_PPC)
679 #elif defined(TARGET_LM32)
680 #elif defined(TARGET_M68K)
681 cpu_m68k_flush_flags(env, env->cc_op);
682 env->cc_op = CC_OP_FLAGS;
683 env->sr = (env->sr & 0xffe0)
684 | env->cc_dest | (env->cc_x << 4);
685 #elif defined(TARGET_MICROBLAZE)
686 #elif defined(TARGET_MIPS)
687 #elif defined(TARGET_SH4)
688 #elif defined(TARGET_ALPHA)
689 #elif defined(TARGET_CRIS)
690 #elif defined(TARGET_S390X)
693 #error unsupported target CPU
696 /* restore global registers */
698 env = (void *) saved_env_reg;
700 /* fail safe : never use cpu_single_env outside cpu_exec() */
701 cpu_single_env = NULL;
705 /* must only be called from the generated code as an exception can be
707 void tb_invalidate_page_range(target_ulong start, target_ulong end)
709 /* XXX: cannot enable it yet because it yields to MMU exception
710 where NIP != read address on PowerPC */
712 target_ulong phys_addr;
713 phys_addr = get_phys_addr_code(env, start);
714 tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
718 #if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
720 void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
722 CPUX86State *saved_env;
726 if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
728 cpu_x86_load_seg_cache(env, seg_reg, selector,
729 (selector << 4), 0xffff, 0);
731 helper_load_seg(seg_reg, selector);
736 void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
738 CPUX86State *saved_env;
743 helper_fsave(ptr, data32);
748 void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
750 CPUX86State *saved_env;
755 helper_frstor(ptr, data32);
760 #endif /* TARGET_I386 */
762 #if !defined(CONFIG_SOFTMMU)
764 #if defined(TARGET_I386)
765 #define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
767 #define EXCEPTION_ACTION cpu_loop_exit()
770 /* 'pc' is the host PC at which the exception was raised. 'address' is
771 the effective address of the memory exception. 'is_write' is 1 if a
772 write caused the exception and otherwise 0'. 'old_set' is the
773 signal set which should be restored */
774 static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
775 int is_write, sigset_t *old_set,
778 TranslationBlock *tb;
782 env = cpu_single_env; /* XXX: find a correct solution for multithread */
783 #if defined(DEBUG_SIGNAL)
784 qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
785 pc, address, is_write, *(unsigned long *)old_set);
787 /* XXX: locking issue */
788 if (is_write && page_unprotect(h2g(address), pc, puc)) {
792 /* see if it is an MMU fault */
793 ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
795 return 0; /* not an MMU fault */
797 return 1; /* the MMU fault was handled without causing real CPU fault */
798 /* now we have a real cpu fault */
801 /* the PC is inside the translated code. It means that we have
802 a virtual CPU fault */
803 cpu_restore_state(tb, env, pc, puc);
806 /* we restore the process signal mask as the sigreturn should
807 do it (XXX: use sigsetjmp) */
808 sigprocmask(SIG_SETMASK, old_set, NULL);
811 /* never comes here */
815 #if defined(__i386__)
817 #if defined(__APPLE__)
818 # include <sys/ucontext.h>
820 # define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
821 # define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
822 # define ERROR_sig(context) ((context)->uc_mcontext->es.err)
823 # define MASK_sig(context) ((context)->uc_sigmask)
824 #elif defined (__NetBSD__)
825 # include <ucontext.h>
827 # define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
828 # define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
829 # define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
830 # define MASK_sig(context) ((context)->uc_sigmask)
831 #elif defined (__FreeBSD__) || defined(__DragonFly__)
832 # include <ucontext.h>
834 # define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_eip))
835 # define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
836 # define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
837 # define MASK_sig(context) ((context)->uc_sigmask)
838 #elif defined(__OpenBSD__)
839 # define EIP_sig(context) ((context)->sc_eip)
840 # define TRAP_sig(context) ((context)->sc_trapno)
841 # define ERROR_sig(context) ((context)->sc_err)
842 # define MASK_sig(context) ((context)->sc_mask)
844 # define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
845 # define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
846 # define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
847 # define MASK_sig(context) ((context)->uc_sigmask)
850 int cpu_signal_handler(int host_signum, void *pinfo,
853 siginfo_t *info = pinfo;
854 #if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
855 ucontext_t *uc = puc;
856 #elif defined(__OpenBSD__)
857 struct sigcontext *uc = puc;
859 struct ucontext *uc = puc;
868 #define REG_TRAPNO TRAPNO
871 trapno = TRAP_sig(uc);
872 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
874 (ERROR_sig(uc) >> 1) & 1 : 0,
878 #elif defined(__x86_64__)
881 #define PC_sig(context) _UC_MACHINE_PC(context)
882 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
883 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
884 #define MASK_sig(context) ((context)->uc_sigmask)
885 #elif defined(__OpenBSD__)
886 #define PC_sig(context) ((context)->sc_rip)
887 #define TRAP_sig(context) ((context)->sc_trapno)
888 #define ERROR_sig(context) ((context)->sc_err)
889 #define MASK_sig(context) ((context)->sc_mask)
890 #elif defined (__FreeBSD__) || defined(__DragonFly__)
891 #include <ucontext.h>
893 #define PC_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_rip))
894 #define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
895 #define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
896 #define MASK_sig(context) ((context)->uc_sigmask)
898 #define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
899 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
900 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
901 #define MASK_sig(context) ((context)->uc_sigmask)
904 int cpu_signal_handler(int host_signum, void *pinfo,
907 siginfo_t *info = pinfo;
909 #if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
910 ucontext_t *uc = puc;
911 #elif defined(__OpenBSD__)
912 struct sigcontext *uc = puc;
914 struct ucontext *uc = puc;
918 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
919 TRAP_sig(uc) == 0xe ?
920 (ERROR_sig(uc) >> 1) & 1 : 0,
924 #elif defined(_ARCH_PPC)
926 /***********************************************************************
927 * signal context platform-specific definitions
931 /* All Registers access - only for local access */
932 # define REG_sig(reg_name, context) ((context)->uc_mcontext.regs->reg_name)
933 /* Gpr Registers access */
934 # define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
935 # define IAR_sig(context) REG_sig(nip, context) /* Program counter */
936 # define MSR_sig(context) REG_sig(msr, context) /* Machine State Register (Supervisor) */
937 # define CTR_sig(context) REG_sig(ctr, context) /* Count register */
938 # define XER_sig(context) REG_sig(xer, context) /* User's integer exception register */
939 # define LR_sig(context) REG_sig(link, context) /* Link register */
940 # define CR_sig(context) REG_sig(ccr, context) /* Condition register */
941 /* Float Registers access */
942 # define FLOAT_sig(reg_num, context) (((double*)((char*)((context)->uc_mcontext.regs+48*4)))[reg_num])
943 # define FPSCR_sig(context) (*(int*)((char*)((context)->uc_mcontext.regs+(48+32*2)*4)))
944 /* Exception Registers access */
945 # define DAR_sig(context) REG_sig(dar, context)
946 # define DSISR_sig(context) REG_sig(dsisr, context)
947 # define TRAP_sig(context) REG_sig(trap, context)
950 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
951 #include <ucontext.h>
952 # define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
953 # define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
954 # define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
955 # define XER_sig(context) ((context)->uc_mcontext.mc_xer)
956 # define LR_sig(context) ((context)->uc_mcontext.mc_lr)
957 # define CR_sig(context) ((context)->uc_mcontext.mc_cr)
958 /* Exception Registers access */
959 # define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
960 # define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
961 # define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
962 #endif /* __FreeBSD__|| __FreeBSD_kernel__ */
965 # include <sys/ucontext.h>
966 typedef struct ucontext SIGCONTEXT;
967 /* All Registers access - only for local access */
968 # define REG_sig(reg_name, context) ((context)->uc_mcontext->ss.reg_name)
969 # define FLOATREG_sig(reg_name, context) ((context)->uc_mcontext->fs.reg_name)
970 # define EXCEPREG_sig(reg_name, context) ((context)->uc_mcontext->es.reg_name)
971 # define VECREG_sig(reg_name, context) ((context)->uc_mcontext->vs.reg_name)
972 /* Gpr Registers access */
973 # define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
974 # define IAR_sig(context) REG_sig(srr0, context) /* Program counter */
975 # define MSR_sig(context) REG_sig(srr1, context) /* Machine State Register (Supervisor) */
976 # define CTR_sig(context) REG_sig(ctr, context)
977 # define XER_sig(context) REG_sig(xer, context) /* Link register */
978 # define LR_sig(context) REG_sig(lr, context) /* User's integer exception register */
979 # define CR_sig(context) REG_sig(cr, context) /* Condition register */
980 /* Float Registers access */
981 # define FLOAT_sig(reg_num, context) FLOATREG_sig(fpregs[reg_num], context)
982 # define FPSCR_sig(context) ((double)FLOATREG_sig(fpscr, context))
983 /* Exception Registers access */
984 # define DAR_sig(context) EXCEPREG_sig(dar, context) /* Fault registers for coredump */
985 # define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
986 # define TRAP_sig(context) EXCEPREG_sig(exception, context) /* number of powerpc exception taken */
987 #endif /* __APPLE__ */
989 int cpu_signal_handler(int host_signum, void *pinfo,
992 siginfo_t *info = pinfo;
993 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
994 ucontext_t *uc = puc;
996 struct ucontext *uc = puc;
1005 if (DSISR_sig(uc) & 0x00800000)
1008 if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000))
1011 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1012 is_write, &uc->uc_sigmask, puc);
1015 #elif defined(__alpha__)
1017 int cpu_signal_handler(int host_signum, void *pinfo,
1020 siginfo_t *info = pinfo;
1021 struct ucontext *uc = puc;
1022 uint32_t *pc = uc->uc_mcontext.sc_pc;
1023 uint32_t insn = *pc;
1026 /* XXX: need kernel patch to get write flag faster */
1027 switch (insn >> 26) {
1042 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1043 is_write, &uc->uc_sigmask, puc);
1045 #elif defined(__sparc__)
1047 int cpu_signal_handler(int host_signum, void *pinfo,
1050 siginfo_t *info = pinfo;
1053 #if !defined(__arch64__) || defined(CONFIG_SOLARIS)
1054 uint32_t *regs = (uint32_t *)(info + 1);
1055 void *sigmask = (regs + 20);
1056 /* XXX: is there a standard glibc define ? */
1057 unsigned long pc = regs[1];
1060 struct sigcontext *sc = puc;
1061 unsigned long pc = sc->sigc_regs.tpc;
1062 void *sigmask = (void *)sc->sigc_mask;
1063 #elif defined(__OpenBSD__)
1064 struct sigcontext *uc = puc;
1065 unsigned long pc = uc->sc_pc;
1066 void *sigmask = (void *)(long)uc->sc_mask;
1070 /* XXX: need kernel patch to get write flag faster */
1072 insn = *(uint32_t *)pc;
1073 if ((insn >> 30) == 3) {
1074 switch((insn >> 19) & 0x3f) {
1098 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1099 is_write, sigmask, NULL);
1102 #elif defined(__arm__)
1104 int cpu_signal_handler(int host_signum, void *pinfo,
1107 siginfo_t *info = pinfo;
1108 struct ucontext *uc = puc;
1112 #if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
1113 pc = uc->uc_mcontext.gregs[R15];
1115 pc = uc->uc_mcontext.arm_pc;
1117 /* XXX: compute is_write */
1119 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1121 &uc->uc_sigmask, puc);
1124 #elif defined(__mc68000)
1126 int cpu_signal_handler(int host_signum, void *pinfo,
1129 siginfo_t *info = pinfo;
1130 struct ucontext *uc = puc;
1134 pc = uc->uc_mcontext.gregs[16];
1135 /* XXX: compute is_write */
1137 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1139 &uc->uc_sigmask, puc);
1142 #elif defined(__ia64)
1145 /* This ought to be in <bits/siginfo.h>... */
1146 # define __ISR_VALID 1
1149 int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
1151 siginfo_t *info = pinfo;
1152 struct ucontext *uc = puc;
1156 ip = uc->uc_mcontext.sc_ip;
1157 switch (host_signum) {
1163 if (info->si_code && (info->si_segvflags & __ISR_VALID))
1164 /* ISR.W (write-access) is bit 33: */
1165 is_write = (info->si_isr >> 33) & 1;
1171 return handle_cpu_signal(ip, (unsigned long)info->si_addr,
1173 (sigset_t *)&uc->uc_sigmask, puc);
1176 #elif defined(__s390__)
1178 int cpu_signal_handler(int host_signum, void *pinfo,
1181 siginfo_t *info = pinfo;
1182 struct ucontext *uc = puc;
1187 pc = uc->uc_mcontext.psw.addr;
1189 /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
1190 of the normal 2 arguments. The 3rd argument contains the "int_code"
1191 from the hardware which does in fact contain the is_write value.
1192 The rt signal handler, as far as I can tell, does not give this value
1193 at all. Not that we could get to it from here even if it were. */
1194 /* ??? This is not even close to complete, since it ignores all
1195 of the read-modify-write instructions. */
1196 pinsn = (uint16_t *)pc;
1197 switch (pinsn[0] >> 8) {
1199 case 0x42: /* STC */
1200 case 0x40: /* STH */
1203 case 0xc4: /* RIL format insns */
1204 switch (pinsn[0] & 0xf) {
1205 case 0xf: /* STRL */
1206 case 0xb: /* STGRL */
1207 case 0x7: /* STHRL */
1211 case 0xe3: /* RXY format insns */
1212 switch (pinsn[2] & 0xff) {
1213 case 0x50: /* STY */
1214 case 0x24: /* STG */
1215 case 0x72: /* STCY */
1216 case 0x70: /* STHY */
1217 case 0x8e: /* STPQ */
1218 case 0x3f: /* STRVH */
1219 case 0x3e: /* STRV */
1220 case 0x2f: /* STRVG */
1225 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1226 is_write, &uc->uc_sigmask, puc);
1229 #elif defined(__mips__)
1231 int cpu_signal_handler(int host_signum, void *pinfo,
1234 siginfo_t *info = pinfo;
1235 struct ucontext *uc = puc;
1236 greg_t pc = uc->uc_mcontext.pc;
1239 /* XXX: compute is_write */
1241 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1242 is_write, &uc->uc_sigmask, puc);
1245 #elif defined(__hppa__)
1247 int cpu_signal_handler(int host_signum, void *pinfo,
1250 struct siginfo *info = pinfo;
1251 struct ucontext *uc = puc;
1252 unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
1253 uint32_t insn = *(uint32_t *)pc;
1256 /* XXX: need kernel patch to get write flag faster. */
1257 switch (insn >> 26) {
1258 case 0x1a: /* STW */
1259 case 0x19: /* STH */
1260 case 0x18: /* STB */
1261 case 0x1b: /* STWM */
1265 case 0x09: /* CSTWX, FSTWX, FSTWS */
1266 case 0x0b: /* CSTDX, FSTDX, FSTDS */
1267 /* Distinguish from coprocessor load ... */
1268 is_write = (insn >> 9) & 1;
1272 switch ((insn >> 6) & 15) {
1273 case 0xa: /* STWS */
1274 case 0x9: /* STHS */
1275 case 0x8: /* STBS */
1276 case 0xe: /* STWAS */
1277 case 0xc: /* STBYS */
1283 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1284 is_write, &uc->uc_sigmask, puc);
1289 #error host CPU specific signal handler needed
1293 #endif /* !defined(CONFIG_SOFTMMU) */