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;
217 if (debug_excp_handler)
218 debug_excp_handler(env);
221 /* main execution loop */
223 volatile sig_atomic_t exit_request;
225 int cpu_exec(CPUState *env1)
227 volatile host_reg_t saved_env_reg;
228 int ret, interrupt_request;
229 TranslationBlock *tb;
231 unsigned long next_tb;
233 if (cpu_halted(env1) == EXCP_HALTED)
236 cpu_single_env = env1;
238 /* the access to env below is actually saving the global register's
239 value, so that files not including target-xyz/exec.h are free to
241 QEMU_BUILD_BUG_ON (sizeof (saved_env_reg) != sizeof (env));
242 saved_env_reg = (host_reg_t) env;
246 if (unlikely(exit_request)) {
247 env->exit_request = 1;
250 #if defined(TARGET_I386)
251 if (!kvm_enabled()) {
252 /* put eflags in CPU temporary format */
253 CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
254 DF = 1 - (2 * ((env->eflags >> 10) & 1));
255 CC_OP = CC_OP_EFLAGS;
256 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
258 #elif defined(TARGET_SPARC)
259 #elif defined(TARGET_M68K)
260 env->cc_op = CC_OP_FLAGS;
261 env->cc_dest = env->sr & 0xf;
262 env->cc_x = (env->sr >> 4) & 1;
263 #elif defined(TARGET_ALPHA)
264 #elif defined(TARGET_ARM)
265 #elif defined(TARGET_PPC)
266 #elif defined(TARGET_MICROBLAZE)
267 #elif defined(TARGET_MIPS)
268 #elif defined(TARGET_SH4)
269 #elif defined(TARGET_CRIS)
270 #elif defined(TARGET_S390X)
273 #error unsupported target CPU
275 env->exception_index = -1;
277 /* prepare setjmp context for exception handling */
279 if (setjmp(env->jmp_env) == 0) {
280 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
282 env = cpu_single_env;
283 #define env cpu_single_env
285 /* if an exception is pending, we execute it here */
286 if (env->exception_index >= 0) {
287 if (env->exception_index >= EXCP_INTERRUPT) {
288 /* exit request from the cpu execution loop */
289 ret = env->exception_index;
290 if (ret == EXCP_DEBUG)
291 cpu_handle_debug_exception(env);
294 #if defined(CONFIG_USER_ONLY)
295 /* if user mode only, we simulate a fake exception
296 which will be handled outside the cpu execution
298 #if defined(TARGET_I386)
299 do_interrupt_user(env->exception_index,
300 env->exception_is_int,
302 env->exception_next_eip);
303 /* successfully delivered */
304 env->old_exception = -1;
306 ret = env->exception_index;
309 #if defined(TARGET_I386)
310 /* simulate a real cpu exception. On i386, it can
311 trigger new exceptions, but we do not handle
312 double or triple faults yet. */
313 do_interrupt(env->exception_index,
314 env->exception_is_int,
316 env->exception_next_eip, 0);
317 /* successfully delivered */
318 env->old_exception = -1;
319 #elif defined(TARGET_PPC)
321 #elif defined(TARGET_MICROBLAZE)
323 #elif defined(TARGET_MIPS)
325 #elif defined(TARGET_SPARC)
327 #elif defined(TARGET_ARM)
329 #elif defined(TARGET_SH4)
331 #elif defined(TARGET_ALPHA)
333 #elif defined(TARGET_CRIS)
335 #elif defined(TARGET_M68K)
338 env->exception_index = -1;
345 longjmp(env->jmp_env, 1);
348 next_tb = 0; /* force lookup of first TB */
350 interrupt_request = env->interrupt_request;
351 if (unlikely(interrupt_request)) {
352 if (unlikely(env->singlestep_enabled & SSTEP_NOIRQ)) {
353 /* Mask out external interrupts for this step. */
354 interrupt_request &= ~(CPU_INTERRUPT_HARD |
359 if (interrupt_request & CPU_INTERRUPT_DEBUG) {
360 env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
361 env->exception_index = EXCP_DEBUG;
364 #if defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_MIPS) || \
365 defined(TARGET_PPC) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || \
366 defined(TARGET_MICROBLAZE)
367 if (interrupt_request & CPU_INTERRUPT_HALT) {
368 env->interrupt_request &= ~CPU_INTERRUPT_HALT;
370 env->exception_index = EXCP_HLT;
374 #if defined(TARGET_I386)
375 if (interrupt_request & CPU_INTERRUPT_INIT) {
376 svm_check_intercept(SVM_EXIT_INIT);
378 env->exception_index = EXCP_HALTED;
380 } else if (interrupt_request & CPU_INTERRUPT_SIPI) {
382 } else if (env->hflags2 & HF2_GIF_MASK) {
383 if ((interrupt_request & CPU_INTERRUPT_SMI) &&
384 !(env->hflags & HF_SMM_MASK)) {
385 svm_check_intercept(SVM_EXIT_SMI);
386 env->interrupt_request &= ~CPU_INTERRUPT_SMI;
389 } else if ((interrupt_request & CPU_INTERRUPT_NMI) &&
390 !(env->hflags2 & HF2_NMI_MASK)) {
391 env->interrupt_request &= ~CPU_INTERRUPT_NMI;
392 env->hflags2 |= HF2_NMI_MASK;
393 do_interrupt(EXCP02_NMI, 0, 0, 0, 1);
395 } else if (interrupt_request & CPU_INTERRUPT_MCE) {
396 env->interrupt_request &= ~CPU_INTERRUPT_MCE;
397 do_interrupt(EXCP12_MCHK, 0, 0, 0, 0);
399 } else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
400 (((env->hflags2 & HF2_VINTR_MASK) &&
401 (env->hflags2 & HF2_HIF_MASK)) ||
402 (!(env->hflags2 & HF2_VINTR_MASK) &&
403 (env->eflags & IF_MASK &&
404 !(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
406 svm_check_intercept(SVM_EXIT_INTR);
407 env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ);
408 intno = cpu_get_pic_interrupt(env);
409 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
410 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
412 env = cpu_single_env;
413 #define env cpu_single_env
415 do_interrupt(intno, 0, 0, 0, 1);
416 /* ensure that no TB jump will be modified as
417 the program flow was changed */
419 #if !defined(CONFIG_USER_ONLY)
420 } else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
421 (env->eflags & IF_MASK) &&
422 !(env->hflags & HF_INHIBIT_IRQ_MASK)) {
424 /* FIXME: this should respect TPR */
425 svm_check_intercept(SVM_EXIT_VINTR);
426 intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
427 qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
428 do_interrupt(intno, 0, 0, 0, 1);
429 env->interrupt_request &= ~CPU_INTERRUPT_VIRQ;
434 #elif defined(TARGET_PPC)
436 if ((interrupt_request & CPU_INTERRUPT_RESET)) {
440 if (interrupt_request & CPU_INTERRUPT_HARD) {
441 ppc_hw_interrupt(env);
442 if (env->pending_interrupts == 0)
443 env->interrupt_request &= ~CPU_INTERRUPT_HARD;
446 #elif defined(TARGET_MICROBLAZE)
447 if ((interrupt_request & CPU_INTERRUPT_HARD)
448 && (env->sregs[SR_MSR] & MSR_IE)
449 && !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
450 && !(env->iflags & (D_FLAG | IMM_FLAG))) {
451 env->exception_index = EXCP_IRQ;
455 #elif defined(TARGET_MIPS)
456 if ((interrupt_request & CPU_INTERRUPT_HARD) &&
457 cpu_mips_hw_interrupts_pending(env)) {
459 env->exception_index = EXCP_EXT_INTERRUPT;
464 #elif defined(TARGET_SPARC)
465 if (interrupt_request & CPU_INTERRUPT_HARD) {
466 if (cpu_interrupts_enabled(env) &&
467 env->interrupt_index > 0) {
468 int pil = env->interrupt_index & 0xf;
469 int type = env->interrupt_index & 0xf0;
471 if (((type == TT_EXTINT) &&
472 cpu_pil_allowed(env, pil)) ||
474 env->exception_index = env->interrupt_index;
479 } else if (interrupt_request & CPU_INTERRUPT_TIMER) {
480 //do_interrupt(0, 0, 0, 0, 0);
481 env->interrupt_request &= ~CPU_INTERRUPT_TIMER;
483 #elif defined(TARGET_ARM)
484 if (interrupt_request & CPU_INTERRUPT_FIQ
485 && !(env->uncached_cpsr & CPSR_F)) {
486 env->exception_index = EXCP_FIQ;
490 /* ARMv7-M interrupt return works by loading a magic value
491 into the PC. On real hardware the load causes the
492 return to occur. The qemu implementation performs the
493 jump normally, then does the exception return when the
494 CPU tries to execute code at the magic address.
495 This will cause the magic PC value to be pushed to
496 the stack if an interrupt occured at the wrong time.
497 We avoid this by disabling interrupts when
498 pc contains a magic address. */
499 if (interrupt_request & CPU_INTERRUPT_HARD
500 && ((IS_M(env) && env->regs[15] < 0xfffffff0)
501 || !(env->uncached_cpsr & CPSR_I))) {
502 env->exception_index = EXCP_IRQ;
506 #elif defined(TARGET_SH4)
507 if (interrupt_request & CPU_INTERRUPT_HARD) {
511 #elif defined(TARGET_ALPHA)
512 if (interrupt_request & CPU_INTERRUPT_HARD) {
516 #elif defined(TARGET_CRIS)
517 if (interrupt_request & CPU_INTERRUPT_HARD
518 && (env->pregs[PR_CCS] & I_FLAG)
519 && !env->locked_irq) {
520 env->exception_index = EXCP_IRQ;
524 if (interrupt_request & CPU_INTERRUPT_NMI
525 && (env->pregs[PR_CCS] & M_FLAG)) {
526 env->exception_index = EXCP_NMI;
530 #elif defined(TARGET_M68K)
531 if (interrupt_request & CPU_INTERRUPT_HARD
532 && ((env->sr & SR_I) >> SR_I_SHIFT)
533 < env->pending_level) {
534 /* Real hardware gets the interrupt vector via an
535 IACK cycle at this point. Current emulated
536 hardware doesn't rely on this, so we
537 provide/save the vector when the interrupt is
539 env->exception_index = env->pending_vector;
544 /* Don't use the cached interupt_request value,
545 do_interrupt may have updated the EXITTB flag. */
546 if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
547 env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
548 /* ensure that no TB jump will be modified as
549 the program flow was changed */
553 if (unlikely(env->exit_request)) {
554 env->exit_request = 0;
555 env->exception_index = EXCP_INTERRUPT;
558 #if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
559 if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
560 /* restore flags in standard format */
561 #if defined(TARGET_I386)
562 env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
563 log_cpu_state(env, X86_DUMP_CCOP);
564 env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
565 #elif defined(TARGET_M68K)
566 cpu_m68k_flush_flags(env, env->cc_op);
567 env->cc_op = CC_OP_FLAGS;
568 env->sr = (env->sr & 0xffe0)
569 | env->cc_dest | (env->cc_x << 4);
570 log_cpu_state(env, 0);
572 log_cpu_state(env, 0);
575 #endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */
578 /* Note: we do it here to avoid a gcc bug on Mac OS X when
579 doing it in tb_find_slow */
580 if (tb_invalidated_flag) {
581 /* as some TB could have been invalidated because
582 of memory exceptions while generating the code, we
583 must recompute the hash index here */
585 tb_invalidated_flag = 0;
587 #ifdef CONFIG_DEBUG_EXEC
588 qemu_log_mask(CPU_LOG_EXEC, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n",
589 (long)tb->tc_ptr, tb->pc,
590 lookup_symbol(tb->pc));
592 /* see if we can patch the calling TB. When the TB
593 spans two pages, we cannot safely do a direct
595 if (next_tb != 0 && tb->page_addr[1] == -1) {
596 tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb);
598 spin_unlock(&tb_lock);
600 /* cpu_interrupt might be called while translating the
601 TB, but before it is linked into a potentially
602 infinite loop and becomes env->current_tb. Avoid
603 starting execution if there is a pending interrupt. */
604 env->current_tb = tb;
606 if (likely(!env->exit_request)) {
608 /* execute the generated code */
609 #if defined(__sparc__) && !defined(CONFIG_SOLARIS)
611 env = cpu_single_env;
612 #define env cpu_single_env
614 next_tb = tcg_qemu_tb_exec(tc_ptr);
615 if ((next_tb & 3) == 2) {
616 /* Instruction counter expired. */
618 tb = (TranslationBlock *)(long)(next_tb & ~3);
620 cpu_pc_from_tb(env, tb);
621 insns_left = env->icount_decr.u32;
622 if (env->icount_extra && insns_left >= 0) {
623 /* Refill decrementer and continue execution. */
624 env->icount_extra += insns_left;
625 if (env->icount_extra > 0xffff) {
628 insns_left = env->icount_extra;
630 env->icount_extra -= insns_left;
631 env->icount_decr.u16.low = insns_left;
633 if (insns_left > 0) {
634 /* Execute remaining instructions. */
635 cpu_exec_nocache(insns_left, tb);
637 env->exception_index = EXCP_INTERRUPT;
643 env->current_tb = NULL;
644 /* reset soft MMU for next block (it can currently
645 only be set by a memory fault) */
651 #if defined(TARGET_I386)
652 /* restore flags in standard format */
653 env->eflags = env->eflags | helper_cc_compute_all(CC_OP) | (DF & DF_MASK);
654 #elif defined(TARGET_ARM)
655 /* XXX: Save/restore host fpu exception state?. */
656 #elif defined(TARGET_SPARC)
657 #elif defined(TARGET_PPC)
658 #elif defined(TARGET_M68K)
659 cpu_m68k_flush_flags(env, env->cc_op);
660 env->cc_op = CC_OP_FLAGS;
661 env->sr = (env->sr & 0xffe0)
662 | env->cc_dest | (env->cc_x << 4);
663 #elif defined(TARGET_MICROBLAZE)
664 #elif defined(TARGET_MIPS)
665 #elif defined(TARGET_SH4)
666 #elif defined(TARGET_ALPHA)
667 #elif defined(TARGET_CRIS)
668 #elif defined(TARGET_S390X)
671 #error unsupported target CPU
674 /* restore global registers */
676 env = (void *) saved_env_reg;
678 /* fail safe : never use cpu_single_env outside cpu_exec() */
679 cpu_single_env = NULL;
683 /* must only be called from the generated code as an exception can be
685 void tb_invalidate_page_range(target_ulong start, target_ulong end)
687 /* XXX: cannot enable it yet because it yields to MMU exception
688 where NIP != read address on PowerPC */
690 target_ulong phys_addr;
691 phys_addr = get_phys_addr_code(env, start);
692 tb_invalidate_phys_page_range(phys_addr, phys_addr + end - start, 0);
696 #if defined(TARGET_I386) && defined(CONFIG_USER_ONLY)
698 void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
700 CPUX86State *saved_env;
704 if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
706 cpu_x86_load_seg_cache(env, seg_reg, selector,
707 (selector << 4), 0xffff, 0);
709 helper_load_seg(seg_reg, selector);
714 void cpu_x86_fsave(CPUX86State *s, target_ulong ptr, int data32)
716 CPUX86State *saved_env;
721 helper_fsave(ptr, data32);
726 void cpu_x86_frstor(CPUX86State *s, target_ulong ptr, int data32)
728 CPUX86State *saved_env;
733 helper_frstor(ptr, data32);
738 #endif /* TARGET_I386 */
740 #if !defined(CONFIG_SOFTMMU)
742 #if defined(TARGET_I386)
743 #define EXCEPTION_ACTION raise_exception_err(env->exception_index, env->error_code)
745 #define EXCEPTION_ACTION cpu_loop_exit()
748 /* 'pc' is the host PC at which the exception was raised. 'address' is
749 the effective address of the memory exception. 'is_write' is 1 if a
750 write caused the exception and otherwise 0'. 'old_set' is the
751 signal set which should be restored */
752 static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
753 int is_write, sigset_t *old_set,
756 TranslationBlock *tb;
760 env = cpu_single_env; /* XXX: find a correct solution for multithread */
761 #if defined(DEBUG_SIGNAL)
762 qemu_printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
763 pc, address, is_write, *(unsigned long *)old_set);
765 /* XXX: locking issue */
766 if (is_write && page_unprotect(h2g(address), pc, puc)) {
770 /* see if it is an MMU fault */
771 ret = cpu_handle_mmu_fault(env, address, is_write, MMU_USER_IDX, 0);
773 return 0; /* not an MMU fault */
775 return 1; /* the MMU fault was handled without causing real CPU fault */
776 /* now we have a real cpu fault */
779 /* the PC is inside the translated code. It means that we have
780 a virtual CPU fault */
781 cpu_restore_state(tb, env, pc, puc);
784 /* we restore the process signal mask as the sigreturn should
785 do it (XXX: use sigsetjmp) */
786 sigprocmask(SIG_SETMASK, old_set, NULL);
789 /* never comes here */
793 #if defined(__i386__)
795 #if defined(__APPLE__)
796 # include <sys/ucontext.h>
798 # define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
799 # define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
800 # define ERROR_sig(context) ((context)->uc_mcontext->es.err)
801 # define MASK_sig(context) ((context)->uc_sigmask)
802 #elif defined (__NetBSD__)
803 # include <ucontext.h>
805 # define EIP_sig(context) ((context)->uc_mcontext.__gregs[_REG_EIP])
806 # define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
807 # define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
808 # define MASK_sig(context) ((context)->uc_sigmask)
809 #elif defined (__FreeBSD__) || defined(__DragonFly__)
810 # include <ucontext.h>
812 # define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_eip))
813 # define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
814 # define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
815 # define MASK_sig(context) ((context)->uc_sigmask)
816 #elif defined(__OpenBSD__)
817 # define EIP_sig(context) ((context)->sc_eip)
818 # define TRAP_sig(context) ((context)->sc_trapno)
819 # define ERROR_sig(context) ((context)->sc_err)
820 # define MASK_sig(context) ((context)->sc_mask)
822 # define EIP_sig(context) ((context)->uc_mcontext.gregs[REG_EIP])
823 # define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
824 # define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
825 # define MASK_sig(context) ((context)->uc_sigmask)
828 int cpu_signal_handler(int host_signum, void *pinfo,
831 siginfo_t *info = pinfo;
832 #if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
833 ucontext_t *uc = puc;
834 #elif defined(__OpenBSD__)
835 struct sigcontext *uc = puc;
837 struct ucontext *uc = puc;
846 #define REG_TRAPNO TRAPNO
849 trapno = TRAP_sig(uc);
850 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
852 (ERROR_sig(uc) >> 1) & 1 : 0,
856 #elif defined(__x86_64__)
859 #define PC_sig(context) _UC_MACHINE_PC(context)
860 #define TRAP_sig(context) ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
861 #define ERROR_sig(context) ((context)->uc_mcontext.__gregs[_REG_ERR])
862 #define MASK_sig(context) ((context)->uc_sigmask)
863 #elif defined(__OpenBSD__)
864 #define PC_sig(context) ((context)->sc_rip)
865 #define TRAP_sig(context) ((context)->sc_trapno)
866 #define ERROR_sig(context) ((context)->sc_err)
867 #define MASK_sig(context) ((context)->sc_mask)
868 #elif defined (__FreeBSD__) || defined(__DragonFly__)
869 #include <ucontext.h>
871 #define PC_sig(context) (*((unsigned long*)&(context)->uc_mcontext.mc_rip))
872 #define TRAP_sig(context) ((context)->uc_mcontext.mc_trapno)
873 #define ERROR_sig(context) ((context)->uc_mcontext.mc_err)
874 #define MASK_sig(context) ((context)->uc_sigmask)
876 #define PC_sig(context) ((context)->uc_mcontext.gregs[REG_RIP])
877 #define TRAP_sig(context) ((context)->uc_mcontext.gregs[REG_TRAPNO])
878 #define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
879 #define MASK_sig(context) ((context)->uc_sigmask)
882 int cpu_signal_handler(int host_signum, void *pinfo,
885 siginfo_t *info = pinfo;
887 #if defined(__NetBSD__) || defined (__FreeBSD__) || defined(__DragonFly__)
888 ucontext_t *uc = puc;
889 #elif defined(__OpenBSD__)
890 struct sigcontext *uc = puc;
892 struct ucontext *uc = puc;
896 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
897 TRAP_sig(uc) == 0xe ?
898 (ERROR_sig(uc) >> 1) & 1 : 0,
902 #elif defined(_ARCH_PPC)
904 /***********************************************************************
905 * signal context platform-specific definitions
909 /* All Registers access - only for local access */
910 # define REG_sig(reg_name, context) ((context)->uc_mcontext.regs->reg_name)
911 /* Gpr Registers access */
912 # define GPR_sig(reg_num, context) REG_sig(gpr[reg_num], context)
913 # define IAR_sig(context) REG_sig(nip, context) /* Program counter */
914 # define MSR_sig(context) REG_sig(msr, context) /* Machine State Register (Supervisor) */
915 # define CTR_sig(context) REG_sig(ctr, context) /* Count register */
916 # define XER_sig(context) REG_sig(xer, context) /* User's integer exception register */
917 # define LR_sig(context) REG_sig(link, context) /* Link register */
918 # define CR_sig(context) REG_sig(ccr, context) /* Condition register */
919 /* Float Registers access */
920 # define FLOAT_sig(reg_num, context) (((double*)((char*)((context)->uc_mcontext.regs+48*4)))[reg_num])
921 # define FPSCR_sig(context) (*(int*)((char*)((context)->uc_mcontext.regs+(48+32*2)*4)))
922 /* Exception Registers access */
923 # define DAR_sig(context) REG_sig(dar, context)
924 # define DSISR_sig(context) REG_sig(dsisr, context)
925 # define TRAP_sig(context) REG_sig(trap, context)
928 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
929 #include <ucontext.h>
930 # define IAR_sig(context) ((context)->uc_mcontext.mc_srr0)
931 # define MSR_sig(context) ((context)->uc_mcontext.mc_srr1)
932 # define CTR_sig(context) ((context)->uc_mcontext.mc_ctr)
933 # define XER_sig(context) ((context)->uc_mcontext.mc_xer)
934 # define LR_sig(context) ((context)->uc_mcontext.mc_lr)
935 # define CR_sig(context) ((context)->uc_mcontext.mc_cr)
936 /* Exception Registers access */
937 # define DAR_sig(context) ((context)->uc_mcontext.mc_dar)
938 # define DSISR_sig(context) ((context)->uc_mcontext.mc_dsisr)
939 # define TRAP_sig(context) ((context)->uc_mcontext.mc_exc)
940 #endif /* __FreeBSD__|| __FreeBSD_kernel__ */
943 # include <sys/ucontext.h>
944 typedef struct ucontext SIGCONTEXT;
945 /* All Registers access - only for local access */
946 # define REG_sig(reg_name, context) ((context)->uc_mcontext->ss.reg_name)
947 # define FLOATREG_sig(reg_name, context) ((context)->uc_mcontext->fs.reg_name)
948 # define EXCEPREG_sig(reg_name, context) ((context)->uc_mcontext->es.reg_name)
949 # define VECREG_sig(reg_name, context) ((context)->uc_mcontext->vs.reg_name)
950 /* Gpr Registers access */
951 # define GPR_sig(reg_num, context) REG_sig(r##reg_num, context)
952 # define IAR_sig(context) REG_sig(srr0, context) /* Program counter */
953 # define MSR_sig(context) REG_sig(srr1, context) /* Machine State Register (Supervisor) */
954 # define CTR_sig(context) REG_sig(ctr, context)
955 # define XER_sig(context) REG_sig(xer, context) /* Link register */
956 # define LR_sig(context) REG_sig(lr, context) /* User's integer exception register */
957 # define CR_sig(context) REG_sig(cr, context) /* Condition register */
958 /* Float Registers access */
959 # define FLOAT_sig(reg_num, context) FLOATREG_sig(fpregs[reg_num], context)
960 # define FPSCR_sig(context) ((double)FLOATREG_sig(fpscr, context))
961 /* Exception Registers access */
962 # define DAR_sig(context) EXCEPREG_sig(dar, context) /* Fault registers for coredump */
963 # define DSISR_sig(context) EXCEPREG_sig(dsisr, context)
964 # define TRAP_sig(context) EXCEPREG_sig(exception, context) /* number of powerpc exception taken */
965 #endif /* __APPLE__ */
967 int cpu_signal_handler(int host_signum, void *pinfo,
970 siginfo_t *info = pinfo;
971 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
972 ucontext_t *uc = puc;
974 struct ucontext *uc = puc;
983 if (DSISR_sig(uc) & 0x00800000)
986 if (TRAP_sig(uc) != 0x400 && (DSISR_sig(uc) & 0x02000000))
989 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
990 is_write, &uc->uc_sigmask, puc);
993 #elif defined(__alpha__)
995 int cpu_signal_handler(int host_signum, void *pinfo,
998 siginfo_t *info = pinfo;
999 struct ucontext *uc = puc;
1000 uint32_t *pc = uc->uc_mcontext.sc_pc;
1001 uint32_t insn = *pc;
1004 /* XXX: need kernel patch to get write flag faster */
1005 switch (insn >> 26) {
1020 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1021 is_write, &uc->uc_sigmask, puc);
1023 #elif defined(__sparc__)
1025 int cpu_signal_handler(int host_signum, void *pinfo,
1028 siginfo_t *info = pinfo;
1031 #if !defined(__arch64__) || defined(CONFIG_SOLARIS)
1032 uint32_t *regs = (uint32_t *)(info + 1);
1033 void *sigmask = (regs + 20);
1034 /* XXX: is there a standard glibc define ? */
1035 unsigned long pc = regs[1];
1038 struct sigcontext *sc = puc;
1039 unsigned long pc = sc->sigc_regs.tpc;
1040 void *sigmask = (void *)sc->sigc_mask;
1041 #elif defined(__OpenBSD__)
1042 struct sigcontext *uc = puc;
1043 unsigned long pc = uc->sc_pc;
1044 void *sigmask = (void *)(long)uc->sc_mask;
1048 /* XXX: need kernel patch to get write flag faster */
1050 insn = *(uint32_t *)pc;
1051 if ((insn >> 30) == 3) {
1052 switch((insn >> 19) & 0x3f) {
1076 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1077 is_write, sigmask, NULL);
1080 #elif defined(__arm__)
1082 int cpu_signal_handler(int host_signum, void *pinfo,
1085 siginfo_t *info = pinfo;
1086 struct ucontext *uc = puc;
1090 #if (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
1091 pc = uc->uc_mcontext.gregs[R15];
1093 pc = uc->uc_mcontext.arm_pc;
1095 /* XXX: compute is_write */
1097 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1099 &uc->uc_sigmask, puc);
1102 #elif defined(__mc68000)
1104 int cpu_signal_handler(int host_signum, void *pinfo,
1107 siginfo_t *info = pinfo;
1108 struct ucontext *uc = puc;
1112 pc = uc->uc_mcontext.gregs[16];
1113 /* XXX: compute is_write */
1115 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1117 &uc->uc_sigmask, puc);
1120 #elif defined(__ia64)
1123 /* This ought to be in <bits/siginfo.h>... */
1124 # define __ISR_VALID 1
1127 int cpu_signal_handler(int host_signum, void *pinfo, void *puc)
1129 siginfo_t *info = pinfo;
1130 struct ucontext *uc = puc;
1134 ip = uc->uc_mcontext.sc_ip;
1135 switch (host_signum) {
1141 if (info->si_code && (info->si_segvflags & __ISR_VALID))
1142 /* ISR.W (write-access) is bit 33: */
1143 is_write = (info->si_isr >> 33) & 1;
1149 return handle_cpu_signal(ip, (unsigned long)info->si_addr,
1151 (sigset_t *)&uc->uc_sigmask, puc);
1154 #elif defined(__s390__)
1156 int cpu_signal_handler(int host_signum, void *pinfo,
1159 siginfo_t *info = pinfo;
1160 struct ucontext *uc = puc;
1165 pc = uc->uc_mcontext.psw.addr;
1167 /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead
1168 of the normal 2 arguments. The 3rd argument contains the "int_code"
1169 from the hardware which does in fact contain the is_write value.
1170 The rt signal handler, as far as I can tell, does not give this value
1171 at all. Not that we could get to it from here even if it were. */
1172 /* ??? This is not even close to complete, since it ignores all
1173 of the read-modify-write instructions. */
1174 pinsn = (uint16_t *)pc;
1175 switch (pinsn[0] >> 8) {
1177 case 0x42: /* STC */
1178 case 0x40: /* STH */
1181 case 0xc4: /* RIL format insns */
1182 switch (pinsn[0] & 0xf) {
1183 case 0xf: /* STRL */
1184 case 0xb: /* STGRL */
1185 case 0x7: /* STHRL */
1189 case 0xe3: /* RXY format insns */
1190 switch (pinsn[2] & 0xff) {
1191 case 0x50: /* STY */
1192 case 0x24: /* STG */
1193 case 0x72: /* STCY */
1194 case 0x70: /* STHY */
1195 case 0x8e: /* STPQ */
1196 case 0x3f: /* STRVH */
1197 case 0x3e: /* STRV */
1198 case 0x2f: /* STRVG */
1203 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1204 is_write, &uc->uc_sigmask, puc);
1207 #elif defined(__mips__)
1209 int cpu_signal_handler(int host_signum, void *pinfo,
1212 siginfo_t *info = pinfo;
1213 struct ucontext *uc = puc;
1214 greg_t pc = uc->uc_mcontext.pc;
1217 /* XXX: compute is_write */
1219 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1220 is_write, &uc->uc_sigmask, puc);
1223 #elif defined(__hppa__)
1225 int cpu_signal_handler(int host_signum, void *pinfo,
1228 struct siginfo *info = pinfo;
1229 struct ucontext *uc = puc;
1230 unsigned long pc = uc->uc_mcontext.sc_iaoq[0];
1231 uint32_t insn = *(uint32_t *)pc;
1234 /* XXX: need kernel patch to get write flag faster. */
1235 switch (insn >> 26) {
1236 case 0x1a: /* STW */
1237 case 0x19: /* STH */
1238 case 0x18: /* STB */
1239 case 0x1b: /* STWM */
1243 case 0x09: /* CSTWX, FSTWX, FSTWS */
1244 case 0x0b: /* CSTDX, FSTDX, FSTDS */
1245 /* Distinguish from coprocessor load ... */
1246 is_write = (insn >> 9) & 1;
1250 switch ((insn >> 6) & 15) {
1251 case 0xa: /* STWS */
1252 case 0x9: /* STHS */
1253 case 0x8: /* STBS */
1254 case 0xe: /* STWAS */
1255 case 0xc: /* STBYS */
1261 return handle_cpu_signal(pc, (unsigned long)info->si_addr,
1262 is_write, &uc->uc_sigmask, puc);
1267 #error host CPU specific signal handler needed
1271 #endif /* !defined(CONFIG_SOFTMMU) */