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 /* we add the TB in the virtual pc hash table */
171 env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;
175 static inline TranslationBlock *tb_find_fast(void)
177 TranslationBlock *tb;
178 target_ulong cs_base, pc;
181 /* we record a subset of the CPU state. It will
182 always be the same before a given translated block
184 cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
185 tb = env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)];
186 if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
187 tb->flags != flags)) {
188 tb = tb_find_slow(pc, cs_base, flags);
193 static CPUDebugExcpHandler *debug_excp_handler;
195 CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler)
197 CPUDebugExcpHandler *old_handler = debug_excp_handler;
199 debug_excp_handler = handler;
203 static void cpu_handle_debug_exception(CPUState *env)
207 if (!env->watchpoint_hit)
208 QTAILQ_FOREACH(wp, &env->watchpoints, entry)
209 wp->flags &= ~BP_WATCHPOINT_HIT;
211 if (debug_excp_handler)
212 debug_excp_handler(env);
215 /* main execution loop */
217 volatile sig_atomic_t exit_request;
219 int cpu_exec(CPUState *env1)
221 volatile host_reg_t saved_env_reg;
222 int ret, interrupt_request;
223 TranslationBlock *tb;
225 unsigned long next_tb;
227 if (cpu_halted(env1) == EXCP_HALTED)
230 cpu_single_env = env1;
232 /* the access to env below is actually saving the global register's
233 value, so that files not including target-xyz/exec.h are free to
235 QEMU_BUILD_BUG_ON (sizeof (saved_env_reg) != sizeof (env));
236 saved_env_reg = (host_reg_t) env;
241 env->exit_request = 1;
245 #if defined(TARGET_I386)
246 if (!kvm_enabled()) {
247 /* put eflags in CPU temporary format */
248 CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
249 DF = 1 - (2 * ((env->eflags >> 10) & 1));
250 CC_OP = CC_OP_EFLAGS;
251 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
253 #elif defined(TARGET_SPARC)
254 #elif defined(TARGET_M68K)
255 env->cc_op = CC_OP_FLAGS;
256 env->cc_dest = env->sr & 0xf;
257 env->cc_x = (env->sr >> 4) & 1;
258 #elif defined(TARGET_ALPHA)
259 #elif defined(TARGET_ARM)
260 #elif defined(TARGET_PPC)
261 #elif defined(TARGET_MICROBLAZE)
262 #elif defined(TARGET_MIPS)
263 #elif defined(TARGET_SH4)
264 #elif defined(TARGET_CRIS)
265 #elif defined(TARGET_S390X)
268 #error unsupported target CPU
270 env->exception_index = -1;
272 /* prepare setjmp context for exception handling */
274 if (setjmp(env->jmp_env) == 0) {
275 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
277 env = cpu_single_env;
278 #define env cpu_single_env
280 /* if an exception is pending, we execute it here */
281 if (env->exception_index >= 0) {
282 if (env->exception_index >= EXCP_INTERRUPT) {
283 /* exit request from the cpu execution loop */
284 ret = env->exception_index;
285 if (ret == EXCP_DEBUG)
286 cpu_handle_debug_exception(env);
289 #if defined(CONFIG_USER_ONLY)
290 /* if user mode only, we simulate a fake exception
291 which will be handled outside the cpu execution
293 #if defined(TARGET_I386)
294 do_interrupt_user(env->exception_index,
295 env->exception_is_int,
297 env->exception_next_eip);
298 /* successfully delivered */
299 env->old_exception = -1;
301 ret = env->exception_index;
304 #if defined(TARGET_I386)
305 /* simulate a real cpu exception. On i386, it can
306 trigger new exceptions, but we do not handle
307 double or triple faults yet. */
308 do_interrupt(env->exception_index,
309 env->exception_is_int,
311 env->exception_next_eip, 0);
312 /* successfully delivered */
313 env->old_exception = -1;
314 #elif defined(TARGET_PPC)
316 #elif defined(TARGET_MICROBLAZE)
318 #elif defined(TARGET_MIPS)
320 #elif defined(TARGET_SPARC)
322 #elif defined(TARGET_ARM)
324 #elif defined(TARGET_SH4)
326 #elif defined(TARGET_ALPHA)
328 #elif defined(TARGET_CRIS)
330 #elif defined(TARGET_M68K)
333 env->exception_index = -1;
340 longjmp(env->jmp_env, 1);
343 next_tb = 0; /* force lookup of first TB */
345 interrupt_request = env->interrupt_request;
346 if (unlikely(interrupt_request)) {
347 if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
348 /* Mask out external interrupts for this step. */
349 interrupt_request &= ~(CPU_INTERRUPT_HARD |
354 if (interrupt_request & CPU_INTERRUPT_DEBUG) {
355 env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
356 env->exception_index = EXCP_DEBUG;
359 #if defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_MIPS) || \
360 defined(TARGET_PPC) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || \
361 defined(TARGET_MICROBLAZE)
362 if (interrupt_request & CPU_INTERRUPT_HALT) {
363 env->interrupt_request &= ~CPU_INTERRUPT_HALT;
365 env->exception_index = EXCP_HLT;
369 #if defined(TARGET_I386)
370 if (interrupt_request & CPU_INTERRUPT_INIT) {
371 svm_check_intercept(SVM_EXIT_INIT);
373 env->exception_index = EXCP_HALTED;
375 } else if (interrupt_request & CPU_INTERRUPT_SIPI) {
377 } else if (env->hflags2 & HF2_GIF_MASK) {
378 if ((interrupt_request & CPU_INTERRUPT_SMI) &&
379 !(env->hflags & HF_SMM_MASK)) {
380 svm_check_intercept(SVM_EXIT_SMI);
381 env->interrupt_request &= ~CPU_INTERRUPT_SMI;
384 } else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
385 !(env->hflags2 & HF2_NMI_MASK)) {
386 env->interrupt_request &= ~CPU_INTERRUPT_NMI;
387 env->hflags2 |= HF2_NMI_MASK;
388 do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
390 } else if (interrupt_request & CPU_INTERRUPT_MCE) {
391 env->interrupt_request &= ~CPU_INTERRUPT_MCE;
392 do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
394 } else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
395 (((env->hflags2 & HF2_VINTR_MASK) &&
396 (env->hflags2 & HF2_HIF_MASK)) ||
397 (!(env->hflags2 & HF2_VINTR_MASK) &&
398 (env->eflags & IF_MASK &&
399 !(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
401 svm_check_intercept(SVM_EXIT_INTR);
402 env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ);
403 intno = cpu_get_pic_interrupt(env);
404 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
405 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
407 env = cpu_single_env;
408 #define env cpu_single_env
410 do_interrupt(intno, 0, 0, 0, 1);
411 /* ensure that no TB jump will be modified as
412 the program flow was changed */
414 #if !defined(CONFIG_USER_ONLY)
415 } else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
416 (env->eflags & IF_MASK) &&
417 !(env->hflags & HF_INHIBIT_IRQ_MASK)) {
419 /* FIXME: this should respect TPR */
420 svm_check_intercept(SVM_EXIT_VINTR);
421 intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
422 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
423 do_interrupt(intno, 0, 0, 0, 1);
424 env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
429 #elif defined(TARGET_PPC)
431 if ((interrupt_request & CPU_INTERRUPT_RESET)) {
435 if (interrupt_request & CPU_INTERRUPT_HARD) {
436 ppc_hw_interrupt(env);
437 if (env->pending_interrupts == 0)
438 env->interrupt_request &= ~CPU_INTERRUPT_HARD;
441 #elif defined(TARGET_MICROBLAZE)
442 if ((interrupt_request & CPU_INTERRUPT_HARD)
443 && (env->sregs[SR_MSR] & MSR_IE)
444 && !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
445 && !(env->iflags & (D_FLAG | IMM_FLAG))) {
446 env->exception_index = EXCP_IRQ;
450 #elif defined(TARGET_MIPS)
451 if ((interrupt_request & CPU_INTERRUPT_HARD) &&
452 (env->CP0_Status & env->CP0_Cause & CP0Ca_IP_mask) &&
453 (env->CP0_Status & (1 << CP0St_IE)) &&
454 !(env->CP0_Status & (1 << CP0St_EXL)) &&
455 !(env->CP0_Status & (1 << CP0St_ERL)) &&
456 !(env->hflags & MIPS_HFLAG_DM)) {
458 env->exception_index = EXCP_EXT_INTERRUPT;
463 #elif defined(TARGET_SPARC)
464 if (interrupt_request & CPU_INTERRUPT_HARD) {
465 if (cpu_interrupts_enabled(env) &&
466 env->interrupt_index > 0) {
467 int pil = env->interrupt_index & 0xf;
468 int type = env->interrupt_index & 0xf0;
470 if (((type == TT_EXTINT) &&
471 cpu_pil_allowed(env, pil)) ||
473 env->exception_index = env->interrupt_index;
478 } else if (interrupt_request & CPU_INTERRUPT_TIMER) {
479 //do_interrupt(0, 0, 0, 0, 0);
480 env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
482 #elif defined(TARGET_ARM)
483 if (interrupt_request & CPU_INTERRUPT_FIQ
484 && !(env->uncached_cpsr & CPSR_F)) {
485 env->exception_index = EXCP_FIQ;
489 /* ARMv7-M interrupt return works by loading a magic value
490 into the PC. On real hardware the load causes the
491 return to occur. The qemu implementation performs the
492 jump normally, then does the exception return when the
493 CPU tries to execute code at the magic address.
494 This will cause the magic PC value to be pushed to
495 the stack if an interrupt occured at the wrong time.
496 We avoid this by disabling interrupts when
497 pc contains a magic address. */
498 if (interrupt_request & CPU_INTERRUPT_HARD
499 && ((IS_M(env) && env->regs[15] < 0xfffffff0)
500 || !(env->uncached_cpsr & CPSR_I))) {
501 env->exception_index = EXCP_IRQ;
505 #elif defined(TARGET_SH4)
506 if (interrupt_request & CPU_INTERRUPT_HARD) {
510 #elif defined(TARGET_ALPHA)
511 if (interrupt_request & CPU_INTERRUPT_HARD) {
515 #elif defined(TARGET_CRIS)
516 if (interrupt_request & CPU_INTERRUPT_HARD
517 && (env->pregs[PR_CCS] & I_FLAG)
518 && !env->locked_irq) {
519 env->exception_index = EXCP_IRQ;
523 if (interrupt_request & CPU_INTERRUPT_NMI
524 && (env->pregs[PR_CCS] & M_FLAG)) {
525 env->exception_index = EXCP_NMI;
529 #elif defined(TARGET_M68K)
530 if (interrupt_request & CPU_INTERRUPT_HARD
531 && ((env->sr & SR_I) >> SR_I_SHIFT)
532 < env->pending_level) {
533 /* Real hardware gets the interrupt vector via an
534 IACK cycle at this point. Current emulated
535 hardware doesn't rely on this, so we
536 provide/save the vector when the interrupt is
538 env->exception_index = env->pending_vector;
543 /* Don't use the cached interupt_request value,
544 do_interrupt may have updated the EXITTB flag. */
545 if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
546 env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
547 /* ensure that no TB jump will be modified as
548 the program flow was changed */
552 if (unlikely(env->exit_request)) {
553 env->exit_request = 0;
554 env->exception_index = EXCP_INTERRUPT;
557 #if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
558 if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
559 /* restore flags in standard format */
560 #if defined(TARGET_I386)
561 env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
562 log_cpu_state(env, X86_DUMP_CCOP);
563 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
564 #elif defined(TARGET_M68K)
565 cpu_m68k_flush_flags(env, env->cc_op);
566 env->cc_op = CC_OP_FLAGS;
567 env->sr = (env->sr & 0xffe0)
568 | env->cc_dest | (env->cc_x << 4);
569 log_cpu_state(env, 0);
571 log_cpu_state(env, 0);
574 #endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */
577 /* Note: we do it here to avoid a gcc bug on Mac OS X when
578 doing it in tb_find_slow */
579 if (tb_invalidated_flag) {
580 /* as some TB could have been invalidated because
581 of memory exceptions while generating the code, we
582 must recompute the hash index here */
584 tb_invalidated_flag = 0;
586 #ifdef CONFIG_DEBUG_EXEC
587 qemu_log_mask(CPU_LOG_EXEC, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n",
588 (long)tb->tc_ptr, tb->pc,
589 lookup_symbol(tb->pc));
591 /* see if we can patch the calling TB. When the TB
592 spans two pages, we cannot safely do a direct
594 if (next_tb != 0 && tb->page_addr[1] == -1) {
595 tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
597 spin_unlock(&tb_lock);
599 /* cpu_interrupt might be called while translating the
600 TB, but before it is linked into a potentially
601 infinite loop and becomes env->current_tb. Avoid
602 starting execution if there is a pending interrupt. */
603 if (!unlikely (env->exit_request)) {
604 env->current_tb = tb;
606 /* execute the generated code */
607 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
609 env = cpu_single_env;
610 #define env cpu_single_env
612 next_tb = tcg_qemu_tb_exec(tc_ptr);
613 env->current_tb = NULL;
614 if ((next_tb & 3) == 2) {
615 /* Instruction counter expired. */
617 tb = (TranslationBlock *)(long)(next_tb & ~3);
619 cpu_pc_from_tb(env, tb);
620 insns_left = env->icount_decr.u32;
621 if (env->icount_extra && insns_left >= 0) {
622 /* Refill decrementer and continue execution. */
623 env->icount_extra += insns_left;
624 if (env->icount_extra > 0xffff) {
627 insns_left = env->icount_extra;
629 env->icount_extra -= insns_left;
630 env->icount_decr.u16.low = insns_left;
632 if (insns_left > 0) {
633 /* Execute remaining instructions. */
634 cpu_exec_nocache(insns_left, tb);
636 env->exception_index = EXCP_INTERRUPT;
642 /* reset soft MMU for next block (it can currently
643 only be set by a memory fault) */
649 #if defined(TARGET_I386)
650 /* restore flags in standard format */
651 env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
652 #elif defined(TARGET_ARM)
653 /* XXX: Save/restore host fpu exception state?. */
654 #elif defined(TARGET_SPARC)
655 #elif defined(TARGET_PPC)
656 #elif defined(TARGET_M68K)
657 cpu_m68k_flush_flags(env, env->cc_op);
658 env->cc_op = CC_OP_FLAGS;
659 env->sr = (env->sr & 0xffe0)
660 | env->cc_dest | (env->cc_x << 4);
661 #elif defined(TARGET_MICROBLAZE)
662 #elif defined(TARGET_MIPS)
663 #elif defined(TARGET_SH4)
664 #elif defined(TARGET_ALPHA)
665 #elif defined(TARGET_CRIS)
666 #elif defined(TARGET_S390X)
669 #error unsupported target CPU
672 /* restore global registers */
674 env = (void *) saved_env_reg;
676 /* fail safe : never use cpu_single_env outside cpu_exec() */
677 cpu_single_env = NULL;
681 /* must only be called from the generated code as an exception can be
683 void tb_invalidate_page_range(target_ulong start, target_ulong end)
685 /* XXX: cannot enable it yet because it yields to MMU exception
686 where NIP != read address on PowerPC */
688 target_ulong phys_addr;
689 phys_addr = get_phys_addr_code(env, start);
690 tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
694 #if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
696 void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
698 CPUX86State *saved_env;
702 if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
704 cpu_x86_load_seg_cache(env, seg_reg, selector,
705 (selector << 4), 0xffff, 0);
707 helper_load_seg(seg_reg, selector);
712 void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
714 CPUX86State *saved_env;
719 helper_fsave(ptr, data32);
724 void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
726 CPUX86State *saved_env;
731 helper_frstor(ptr, data32);
736 #endif /* TARGET_I386 */
738 #if !defined(CONFIG_SOFTMMU)
740 #if defined(TARGET_I386)
741 #define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
743 #define EXCEPTION_ACTION cpu_loop_exit()
746 /* 'pc' is the host PC at which the exception was raised. 'address' is
747 the effective address of the memory exception. 'is_write' is 1 if a
748 write caused the exception and otherwise 0'. 'old_set' is the
749 signal set which should be restored */
750 static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
751 int is_write, sigset_t *old_set,
754 TranslationBlock *tb;
758 env = cpu_single_env; /* XXX: find a correct solution for multithread */
759 #if defined(DEBUG_SIGNAL)
760 qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
761 pc, address, is_write, *(unsigned long *)old_set);
763 /* XXX: locking issue */
764 if (is_write && page_unprotect(h2g(address), pc, puc)) {
768 /* see if it is an MMU fault */
769 ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
771 return 0; /* not an MMU fault */
773 return 1; /* the MMU fault was handled without causing real CPU fault */
774 /* now we have a real cpu fault */
777 /* the PC is inside the translated code. It means that we have
778 a virtual CPU fault */
779 cpu_restore_state(tb, env, pc, puc);
782 /* we restore the process signal mask as the sigreturn should
783 do it (XXX: use sigsetjmp) */
784 sigprocmask(SIG_SETMASK, old_set, NULL);
787 /* never comes here */
791 #if defined(__i386__)
793 #if defined(__APPLE__)
794 # include <sys/ucontext.h>
796 # define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
797 # define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
798 # define ERROR_sig(context) ((context)->uc_mcontext->es.err)
799 # define MASK_sig(context) ((context)->uc_sigmask)
800 #elif defined (__NetBSD__)
801 # include <ucontext.h>
803 # define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
804 # define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
805 # define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
806 # define MASK_sig(context) ((context)->uc_sigmask)
807 #elif defined (__FreeBSD__) || defined(__DragonFly__)
808 # include <ucontext.h>
810 # define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_eip))
811 # define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
812 # define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
813 # define MASK_sig(context) ((context)->uc_sigmask)
814 #elif defined(__OpenBSD__)
815 # define EIP_sig(context) ((context)->sc_eip)
816 # define TRAP_sig(context) ((context)->sc_trapno)
817 # define ERROR_sig(context) ((context)->sc_err)
818 # define MASK_sig(context) ((context)->sc_mask)
820 # define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
821 # define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
822 # define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
823 # define MASK_sig(context) ((context)->uc_sigmask)
826 int cpu_signal_handler(int host_signum, void *pinfo,
829 siginfo_t *info = pinfo;
830 #if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
831 ucontext_t *uc = puc;
832 #elif defined(__OpenBSD__)
833 struct sigcontext *uc = puc;
835 struct ucontext *uc = puc;
844 #define REG_TRAPNO TRAPNO
847 trapno = TRAP_sig(uc);
848 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
850 (ERROR_sig(uc) >> 1) & 1 : 0,
854 #elif defined(__x86_64__)
857 #define PC_sig(context) _UC_MACHINE_PC(context)
858 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
859 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
860 #define MASK_sig(context) ((context)->uc_sigmask)
861 #elif defined(__OpenBSD__)
862 #define PC_sig(context) ((context)->sc_rip)
863 #define TRAP_sig(context) ((context)->sc_trapno)
864 #define ERROR_sig(context) ((context)->sc_err)
865 #define MASK_sig(context) ((context)->sc_mask)
866 #elif defined (__FreeBSD__) || defined(__DragonFly__)
867 #include <ucontext.h>
869 #define PC_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_rip))
870 #define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
871 #define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
872 #define MASK_sig(context) ((context)->uc_sigmask)
874 #define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
875 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
876 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
877 #define MASK_sig(context) ((context)->uc_sigmask)
880 int cpu_signal_handler(int host_signum, void *pinfo,
883 siginfo_t *info = pinfo;
885 #if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
886 ucontext_t *uc = puc;
887 #elif defined(__OpenBSD__)
888 struct sigcontext *uc = puc;
890 struct ucontext *uc = puc;
894 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
895 TRAP_sig(uc) == 0xe ?
896 (ERROR_sig(uc) >> 1) & 1 : 0,
900 #elif defined(_ARCH_PPC)
902 /***********************************************************************
903 * signal context platform-specific definitions
907 /* All Registers access - only for local access */
908 # define REG_sig(reg_name, context) ((context)->uc_mcontext.regs->reg_name)
909 /* Gpr Registers access */
910 # define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
911 # define IAR_sig(context) REG_sig(nip, context) /* Program counter */
912 # define MSR_sig(context) REG_sig(msr, context) /* Machine State Register (Supervisor) */
913 # define CTR_sig(context) REG_sig(ctr, context) /* Count register */
914 # define XER_sig(context) REG_sig(xer, context) /* User's integer exception register */
915 # define LR_sig(context) REG_sig(link, context) /* Link register */
916 # define CR_sig(context) REG_sig(ccr, context) /* Condition register */
917 /* Float Registers access */
918 # define FLOAT_sig(reg_num, context) (((double*)((char*)((context)->uc_mcontext.regs+48*4)))[reg_num])
919 # define FPSCR_sig(context) (*(int*)((char*)((context)->uc_mcontext.regs+(48+32*2)*4)))
920 /* Exception Registers access */
921 # define DAR_sig(context) REG_sig(dar, context)
922 # define DSISR_sig(context) REG_sig(dsisr, context)
923 # define TRAP_sig(context) REG_sig(trap, context)
926 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
927 #include <ucontext.h>
928 # define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
929 # define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
930 # define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
931 # define XER_sig(context) ((context)->uc_mcontext.mc_xer)
932 # define LR_sig(context) ((context)->uc_mcontext.mc_lr)
933 # define CR_sig(context) ((context)->uc_mcontext.mc_cr)
934 /* Exception Registers access */
935 # define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
936 # define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
937 # define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
938 #endif /* __FreeBSD__|| __FreeBSD_kernel__ */
941 # include <sys/ucontext.h>
942 typedef struct ucontext SIGCONTEXT;
943 /* All Registers access - only for local access */
944 # define REG_sig(reg_name, context) ((context)->uc_mcontext->ss.reg_name)
945 # define FLOATREG_sig(reg_name, context) ((context)->uc_mcontext->fs.reg_name)
946 # define EXCEPREG_sig(reg_name, context) ((context)->uc_mcontext->es.reg_name)
947 # define VECREG_sig(reg_name, context) ((context)->uc_mcontext->vs.reg_name)
948 /* Gpr Registers access */
949 # define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
950 # define IAR_sig(context) REG_sig(srr0, context) /* Program counter */
951 # define MSR_sig(context) REG_sig(srr1, context) /* Machine State Register (Supervisor) */
952 # define CTR_sig(context) REG_sig(ctr, context)
953 # define XER_sig(context) REG_sig(xer, context) /* Link register */
954 # define LR_sig(context) REG_sig(lr, context) /* User's integer exception register */
955 # define CR_sig(context) REG_sig(cr, context) /* Condition register */
956 /* Float Registers access */
957 # define FLOAT_sig(reg_num, context) FLOATREG_sig(fpregs[reg_num], context)
958 # define FPSCR_sig(context) ((double)FLOATREG_sig(fpscr, context))
959 /* Exception Registers access */
960 # define DAR_sig(context) EXCEPREG_sig(dar, context) /* Fault registers for coredump */
961 # define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
962 # define TRAP_sig(context) EXCEPREG_sig(exception, context) /* number of powerpc exception taken */
963 #endif /* __APPLE__ */
965 int cpu_signal_handler(int host_signum, void *pinfo,
968 siginfo_t *info = pinfo;
969 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
970 ucontext_t *uc = puc;
972 struct ucontext *uc = puc;
981 if (DSISR_sig(uc) & 0x00800000)
984 if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000))
987 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
988 is_write, &uc->uc_sigmask, puc);
991 #elif defined(__alpha__)
993 int cpu_signal_handler(int host_signum, void *pinfo,
996 siginfo_t *info = pinfo;
997 struct ucontext *uc = puc;
998 uint32_t *pc = uc->uc_mcontext.sc_pc;
1002 /* XXX: need kernel patch to get write flag faster */
1003 switch (insn >> 26) {
1018 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1019 is_write, &uc->uc_sigmask, puc);
1021 #elif defined(__sparc__)
1023 int cpu_signal_handler(int host_signum, void *pinfo,
1026 siginfo_t *info = pinfo;
1029 #if !defined(__arch64__) || defined(CONFIG_SOLARIS)
1030 uint32_t *regs = (uint32_t *)(info + 1);
1031 void *sigmask = (regs + 20);
1032 /* XXX: is there a standard glibc define ? */
1033 unsigned long pc = regs[1];
1036 struct sigcontext *sc = puc;
1037 unsigned long pc = sc->sigc_regs.tpc;
1038 void *sigmask = (void *)sc->sigc_mask;
1039 #elif defined(__OpenBSD__)
1040 struct sigcontext *uc = puc;
1041 unsigned long pc = uc->sc_pc;
1042 void *sigmask = (void *)(long)uc->sc_mask;
1046 /* XXX: need kernel patch to get write flag faster */
1048 insn = *(uint32_t *)pc;
1049 if ((insn >> 30) == 3) {
1050 switch((insn >> 19) & 0x3f) {
1074 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1075 is_write, sigmask, NULL);
1078 #elif defined(__arm__)
1080 int cpu_signal_handler(int host_signum, void *pinfo,
1083 siginfo_t *info = pinfo;
1084 struct ucontext *uc = puc;
1088 #if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
1089 pc = uc->uc_mcontext.gregs[R15];
1091 pc = uc->uc_mcontext.arm_pc;
1093 /* XXX: compute is_write */
1095 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1097 &uc->uc_sigmask, puc);
1100 #elif defined(__mc68000)
1102 int cpu_signal_handler(int host_signum, void *pinfo,
1105 siginfo_t *info = pinfo;
1106 struct ucontext *uc = puc;
1110 pc = uc->uc_mcontext.gregs[16];
1111 /* XXX: compute is_write */
1113 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1115 &uc->uc_sigmask, puc);
1118 #elif defined(__ia64)
1121 /* This ought to be in <bits/siginfo.h>... */
1122 # define __ISR_VALID 1
1125 int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
1127 siginfo_t *info = pinfo;
1128 struct ucontext *uc = puc;
1132 ip = uc->uc_mcontext.sc_ip;
1133 switch (host_signum) {
1139 if (info->si_code && (info->si_segvflags & __ISR_VALID))
1140 /* ISR.W (write-access) is bit 33: */
1141 is_write = (info->si_isr >> 33) & 1;
1147 return handle_cpu_signal(ip, (unsigned long)info->si_addr,
1149 (sigset_t *)&uc->uc_sigmask, puc);
1152 #elif defined(__s390__)
1154 int cpu_signal_handler(int host_signum, void *pinfo,
1157 siginfo_t *info = pinfo;
1158 struct ucontext *uc = puc;
1163 pc = uc->uc_mcontext.psw.addr;
1165 /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
1166 of the normal 2 arguments. The 3rd argument contains the "int_code"
1167 from the hardware which does in fact contain the is_write value.
1168 The rt signal handler, as far as I can tell, does not give this value
1169 at all. Not that we could get to it from here even if it were. */
1170 /* ??? This is not even close to complete, since it ignores all
1171 of the read-modify-write instructions. */
1172 pinsn = (uint16_t *)pc;
1173 switch (pinsn[0] >> 8) {
1175 case 0x42: /* STC */
1176 case 0x40: /* STH */
1179 case 0xc4: /* RIL format insns */
1180 switch (pinsn[0] & 0xf) {
1181 case 0xf: /* STRL */
1182 case 0xb: /* STGRL */
1183 case 0x7: /* STHRL */
1187 case 0xe3: /* RXY format insns */
1188 switch (pinsn[2] & 0xff) {
1189 case 0x50: /* STY */
1190 case 0x24: /* STG */
1191 case 0x72: /* STCY */
1192 case 0x70: /* STHY */
1193 case 0x8e: /* STPQ */
1194 case 0x3f: /* STRVH */
1195 case 0x3e: /* STRV */
1196 case 0x2f: /* STRVG */
1201 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1202 is_write, &uc->uc_sigmask, puc);
1205 #elif defined(__mips__)
1207 int cpu_signal_handler(int host_signum, void *pinfo,
1210 siginfo_t *info = pinfo;
1211 struct ucontext *uc = puc;
1212 greg_t pc = uc->uc_mcontext.pc;
1215 /* XXX: compute is_write */
1217 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1218 is_write, &uc->uc_sigmask, puc);
1221 #elif defined(__hppa__)
1223 int cpu_signal_handler(int host_signum, void *pinfo,
1226 struct siginfo *info = pinfo;
1227 struct ucontext *uc = puc;
1228 unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
1229 uint32_t insn = *(uint32_t *)pc;
1232 /* XXX: need kernel patch to get write flag faster. */
1233 switch (insn >> 26) {
1234 case 0x1a: /* STW */
1235 case 0x19: /* STH */
1236 case 0x18: /* STB */
1237 case 0x1b: /* STWM */
1241 case 0x09: /* CSTWX, FSTWX, FSTWS */
1242 case 0x0b: /* CSTDX, FSTDX, FSTDS */
1243 /* Distinguish from coprocessor load ... */
1244 is_write = (insn >> 9) & 1;
1248 switch ((insn >> 6) & 15) {
1249 case 0xa: /* STWS */
1250 case 0x9: /* STHS */
1251 case 0x8: /* STBS */
1252 case 0xe: /* STWAS */
1253 case 0xc: /* STBYS */
1259 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1260 is_write, &uc->uc_sigmask, puc);
1265 #error host CPU specific signal handler needed
1269 #endif /* !defined(CONFIG_SOFTMMU) */