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;
240 if (unlikely(exit_request)) {
241 env->exit_request = 1;
244 #if defined(TARGET_I386)
245 if (!kvm_enabled()) {
246 /* put eflags in CPU temporary format */
247 CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
248 DF = 1 - (2 * ((env->eflags >> 10) & 1));
249 CC_OP = CC_OP_EFLAGS;
250 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
252 #elif defined(TARGET_SPARC)
253 #elif defined(TARGET_M68K)
254 env->cc_op = CC_OP_FLAGS;
255 env->cc_dest = env->sr & 0xf;
256 env->cc_x = (env->sr >> 4) & 1;
257 #elif defined(TARGET_ALPHA)
258 #elif defined(TARGET_ARM)
259 #elif defined(TARGET_PPC)
260 #elif defined(TARGET_MICROBLAZE)
261 #elif defined(TARGET_MIPS)
262 #elif defined(TARGET_SH4)
263 #elif defined(TARGET_CRIS)
264 #elif defined(TARGET_S390X)
267 #error unsupported target CPU
269 env->exception_index = -1;
271 /* prepare setjmp context for exception handling */
273 if (setjmp(env->jmp_env) == 0) {
274 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
276 env = cpu_single_env;
277 #define env cpu_single_env
279 /* if an exception is pending, we execute it here */
280 if (env->exception_index >= 0) {
281 if (env->exception_index >= EXCP_INTERRUPT) {
282 /* exit request from the cpu execution loop */
283 ret = env->exception_index;
284 if (ret == EXCP_DEBUG)
285 cpu_handle_debug_exception(env);
288 #if defined(CONFIG_USER_ONLY)
289 /* if user mode only, we simulate a fake exception
290 which will be handled outside the cpu execution
292 #if defined(TARGET_I386)
293 do_interrupt_user(env->exception_index,
294 env->exception_is_int,
296 env->exception_next_eip);
297 /* successfully delivered */
298 env->old_exception = -1;
300 ret = env->exception_index;
303 #if defined(TARGET_I386)
304 /* simulate a real cpu exception. On i386, it can
305 trigger new exceptions, but we do not handle
306 double or triple faults yet. */
307 do_interrupt(env->exception_index,
308 env->exception_is_int,
310 env->exception_next_eip, 0);
311 /* successfully delivered */
312 env->old_exception = -1;
313 #elif defined(TARGET_PPC)
315 #elif defined(TARGET_MICROBLAZE)
317 #elif defined(TARGET_MIPS)
319 #elif defined(TARGET_SPARC)
321 #elif defined(TARGET_ARM)
323 #elif defined(TARGET_SH4)
325 #elif defined(TARGET_ALPHA)
327 #elif defined(TARGET_CRIS)
329 #elif defined(TARGET_M68K)
332 env->exception_index = -1;
339 longjmp(env->jmp_env, 1);
342 next_tb = 0; /* force lookup of first TB */
344 interrupt_request = env->interrupt_request;
345 if (unlikely(interrupt_request)) {
346 if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
347 /* Mask out external interrupts for this step. */
348 interrupt_request &= ~(CPU_INTERRUPT_HARD |
353 if (interrupt_request & CPU_INTERRUPT_DEBUG) {
354 env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
355 env->exception_index = EXCP_DEBUG;
358 #if defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_MIPS) || \
359 defined(TARGET_PPC) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || \
360 defined(TARGET_MICROBLAZE)
361 if (interrupt_request & CPU_INTERRUPT_HALT) {
362 env->interrupt_request &= ~CPU_INTERRUPT_HALT;
364 env->exception_index = EXCP_HLT;
368 #if defined(TARGET_I386)
369 if (interrupt_request & CPU_INTERRUPT_INIT) {
370 svm_check_intercept(SVM_EXIT_INIT);
372 env->exception_index = EXCP_HALTED;
374 } else if (interrupt_request & CPU_INTERRUPT_SIPI) {
376 } else if (env->hflags2 & HF2_GIF_MASK) {
377 if ((interrupt_request & CPU_INTERRUPT_SMI) &&
378 !(env->hflags & HF_SMM_MASK)) {
379 svm_check_intercept(SVM_EXIT_SMI);
380 env->interrupt_request &= ~CPU_INTERRUPT_SMI;
383 } else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
384 !(env->hflags2 & HF2_NMI_MASK)) {
385 env->interrupt_request &= ~CPU_INTERRUPT_NMI;
386 env->hflags2 |= HF2_NMI_MASK;
387 do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
389 } else if (interrupt_request & CPU_INTERRUPT_MCE) {
390 env->interrupt_request &= ~CPU_INTERRUPT_MCE;
391 do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
393 } else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
394 (((env->hflags2 & HF2_VINTR_MASK) &&
395 (env->hflags2 & HF2_HIF_MASK)) ||
396 (!(env->hflags2 & HF2_VINTR_MASK) &&
397 (env->eflags & IF_MASK &&
398 !(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
400 svm_check_intercept(SVM_EXIT_INTR);
401 env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ);
402 intno = cpu_get_pic_interrupt(env);
403 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
404 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
406 env = cpu_single_env;
407 #define env cpu_single_env
409 do_interrupt(intno, 0, 0, 0, 1);
410 /* ensure that no TB jump will be modified as
411 the program flow was changed */
413 #if !defined(CONFIG_USER_ONLY)
414 } else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
415 (env->eflags & IF_MASK) &&
416 !(env->hflags & HF_INHIBIT_IRQ_MASK)) {
418 /* FIXME: this should respect TPR */
419 svm_check_intercept(SVM_EXIT_VINTR);
420 intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
421 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
422 do_interrupt(intno, 0, 0, 0, 1);
423 env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
428 #elif defined(TARGET_PPC)
430 if ((interrupt_request & CPU_INTERRUPT_RESET)) {
434 if (interrupt_request & CPU_INTERRUPT_HARD) {
435 ppc_hw_interrupt(env);
436 if (env->pending_interrupts == 0)
437 env->interrupt_request &= ~CPU_INTERRUPT_HARD;
440 #elif defined(TARGET_MICROBLAZE)
441 if ((interrupt_request & CPU_INTERRUPT_HARD)
442 && (env->sregs[SR_MSR] & MSR_IE)
443 && !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
444 && !(env->iflags & (D_FLAG | IMM_FLAG))) {
445 env->exception_index = EXCP_IRQ;
449 #elif defined(TARGET_MIPS)
450 if ((interrupt_request & CPU_INTERRUPT_HARD) &&
451 (env->CP0_Status & env->CP0_Cause & CP0Ca_IP_mask) &&
452 (env->CP0_Status & (1 << CP0St_IE)) &&
453 !(env->CP0_Status & (1 << CP0St_EXL)) &&
454 !(env->CP0_Status & (1 << CP0St_ERL)) &&
455 !(env->hflags & MIPS_HFLAG_DM)) {
457 env->exception_index = EXCP_EXT_INTERRUPT;
462 #elif defined(TARGET_SPARC)
463 if (interrupt_request & CPU_INTERRUPT_HARD) {
464 if (cpu_interrupts_enabled(env) &&
465 env->interrupt_index > 0) {
466 int pil = env->interrupt_index & 0xf;
467 int type = env->interrupt_index & 0xf0;
469 if (((type == TT_EXTINT) &&
470 cpu_pil_allowed(env, pil)) ||
472 env->exception_index = env->interrupt_index;
477 } else if (interrupt_request & CPU_INTERRUPT_TIMER) {
478 //do_interrupt(0, 0, 0, 0, 0);
479 env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
481 #elif defined(TARGET_ARM)
482 if (interrupt_request & CPU_INTERRUPT_FIQ
483 && !(env->uncached_cpsr & CPSR_F)) {
484 env->exception_index = EXCP_FIQ;
488 /* ARMv7-M interrupt return works by loading a magic value
489 into the PC. On real hardware the load causes the
490 return to occur. The qemu implementation performs the
491 jump normally, then does the exception return when the
492 CPU tries to execute code at the magic address.
493 This will cause the magic PC value to be pushed to
494 the stack if an interrupt occured at the wrong time.
495 We avoid this by disabling interrupts when
496 pc contains a magic address. */
497 if (interrupt_request & CPU_INTERRUPT_HARD
498 && ((IS_M(env) && env->regs[15] < 0xfffffff0)
499 || !(env->uncached_cpsr & CPSR_I))) {
500 env->exception_index = EXCP_IRQ;
504 #elif defined(TARGET_SH4)
505 if (interrupt_request & CPU_INTERRUPT_HARD) {
509 #elif defined(TARGET_ALPHA)
510 if (interrupt_request & CPU_INTERRUPT_HARD) {
514 #elif defined(TARGET_CRIS)
515 if (interrupt_request & CPU_INTERRUPT_HARD
516 && (env->pregs[PR_CCS] & I_FLAG)
517 && !env->locked_irq) {
518 env->exception_index = EXCP_IRQ;
522 if (interrupt_request & CPU_INTERRUPT_NMI
523 && (env->pregs[PR_CCS] & M_FLAG)) {
524 env->exception_index = EXCP_NMI;
528 #elif defined(TARGET_M68K)
529 if (interrupt_request & CPU_INTERRUPT_HARD
530 && ((env->sr & SR_I) >> SR_I_SHIFT)
531 < env->pending_level) {
532 /* Real hardware gets the interrupt vector via an
533 IACK cycle at this point. Current emulated
534 hardware doesn't rely on this, so we
535 provide/save the vector when the interrupt is
537 env->exception_index = env->pending_vector;
542 /* Don't use the cached interupt_request value,
543 do_interrupt may have updated the EXITTB flag. */
544 if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
545 env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
546 /* ensure that no TB jump will be modified as
547 the program flow was changed */
551 if (unlikely(env->exit_request)) {
552 env->exit_request = 0;
553 env->exception_index = EXCP_INTERRUPT;
556 #if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
557 if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
558 /* restore flags in standard format */
559 #if defined(TARGET_I386)
560 env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
561 log_cpu_state(env, X86_DUMP_CCOP);
562 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
563 #elif defined(TARGET_M68K)
564 cpu_m68k_flush_flags(env, env->cc_op);
565 env->cc_op = CC_OP_FLAGS;
566 env->sr = (env->sr & 0xffe0)
567 | env->cc_dest | (env->cc_x << 4);
568 log_cpu_state(env, 0);
570 log_cpu_state(env, 0);
573 #endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */
576 /* Note: we do it here to avoid a gcc bug on Mac OS X when
577 doing it in tb_find_slow */
578 if (tb_invalidated_flag) {
579 /* as some TB could have been invalidated because
580 of memory exceptions while generating the code, we
581 must recompute the hash index here */
583 tb_invalidated_flag = 0;
585 #ifdef CONFIG_DEBUG_EXEC
586 qemu_log_mask(CPU_LOG_EXEC, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n",
587 (long)tb->tc_ptr, tb->pc,
588 lookup_symbol(tb->pc));
590 /* see if we can patch the calling TB. When the TB
591 spans two pages, we cannot safely do a direct
593 if (next_tb != 0 && tb->page_addr[1] == -1) {
594 tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
596 spin_unlock(&tb_lock);
598 /* cpu_interrupt might be called while translating the
599 TB, but before it is linked into a potentially
600 infinite loop and becomes env->current_tb. Avoid
601 starting execution if there is a pending interrupt. */
602 env->current_tb = tb;
604 if (likely(!env->exit_request)) {
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 if ((next_tb & 3) == 2) {
614 /* Instruction counter expired. */
616 tb = (TranslationBlock *)(long)(next_tb & ~3);
618 cpu_pc_from_tb(env, tb);
619 insns_left = env->icount_decr.u32;
620 if (env->icount_extra && insns_left >= 0) {
621 /* Refill decrementer and continue execution. */
622 env->icount_extra += insns_left;
623 if (env->icount_extra > 0xffff) {
626 insns_left = env->icount_extra;
628 env->icount_extra -= insns_left;
629 env->icount_decr.u16.low = insns_left;
631 if (insns_left > 0) {
632 /* Execute remaining instructions. */
633 cpu_exec_nocache(insns_left, tb);
635 env->exception_index = EXCP_INTERRUPT;
641 env->current_tb = NULL;
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) */