2 * Emulation of Linux signals
4 * Copyright (c) 2003 Fabrice Bellard
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <sys/ucontext.h>
38 //#define DEBUG_SIGNAL
40 #define MAX_SIGQUEUE_SIZE 1024
43 struct sigqueue *next;
44 target_siginfo_t info;
47 struct emulated_sigaction {
48 struct target_sigaction sa;
49 int pending; /* true if signal is pending */
50 struct sigqueue *first;
51 struct sigqueue info; /* in order to always have memory for the
52 first signal, we put it here */
55 static struct emulated_sigaction sigact_table[TARGET_NSIG];
56 static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
57 static struct sigqueue *first_free; /* first free siginfo queue entry */
58 static int signal_pending; /* non zero if a signal may be pending */
60 static void host_signal_handler(int host_signum, siginfo_t *info,
63 /* XXX: do it properly */
64 static inline int host_to_target_signal(int sig)
69 static inline int target_to_host_signal(int sig)
74 void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
77 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
78 d->sig[i] = tswapl(((unsigned long *)s)[i]);
82 void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
85 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
86 ((unsigned long *)d)[i] = tswapl(s->sig[i]);
90 void host_to_target_old_sigset(target_ulong *old_sigset,
91 const sigset_t *sigset)
93 *old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff);
96 void target_to_host_old_sigset(sigset_t *sigset,
97 const target_ulong *old_sigset)
100 *(unsigned long *)sigset = tswapl(*old_sigset);
103 /* siginfo conversion */
105 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
106 const siginfo_t *info)
109 sig = host_to_target_signal(info->si_signo);
110 tinfo->si_signo = sig;
113 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
114 sig == SIGBUS || sig == SIGTRAP) {
115 /* should never come here, but who knows. The information for
116 the target is irrelevant */
117 tinfo->_sifields._sigfault._addr = 0;
118 } else if (sig >= TARGET_SIGRTMIN) {
119 tinfo->_sifields._rt._pid = info->si_pid;
120 tinfo->_sifields._rt._uid = info->si_uid;
121 /* XXX: potential problem if 64 bit */
122 tinfo->_sifields._rt._sigval.sival_ptr =
123 (target_ulong)info->si_value.sival_ptr;
127 static void tswap_siginfo(target_siginfo_t *tinfo,
128 const target_siginfo_t *info)
131 sig = info->si_signo;
132 tinfo->si_signo = tswap32(sig);
133 tinfo->si_errno = tswap32(info->si_errno);
134 tinfo->si_code = tswap32(info->si_code);
135 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
136 sig == SIGBUS || sig == SIGTRAP) {
137 tinfo->_sifields._sigfault._addr =
138 tswapl(info->_sifields._sigfault._addr);
139 } else if (sig >= TARGET_SIGRTMIN) {
140 tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
141 tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
142 tinfo->_sifields._rt._sigval.sival_ptr =
143 tswapl(info->_sifields._rt._sigval.sival_ptr);
148 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
150 host_to_target_siginfo_noswap(tinfo, info);
151 tswap_siginfo(tinfo, tinfo);
154 /* XXX: we support only POSIX RT signals are used. */
155 /* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
156 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
158 info->si_signo = tswap32(tinfo->si_signo);
159 info->si_errno = tswap32(tinfo->si_errno);
160 info->si_code = tswap32(tinfo->si_code);
161 info->si_pid = tswap32(tinfo->_sifields._rt._pid);
162 info->si_uid = tswap32(tinfo->_sifields._rt._uid);
163 info->si_value.sival_ptr =
164 (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
167 void signal_init(void)
169 struct sigaction act;
172 /* set all host signal handlers. ALL signals are blocked during
173 the handlers to serialize them. */
174 sigfillset(&act.sa_mask);
175 act.sa_flags = SA_SIGINFO;
176 act.sa_sigaction = host_signal_handler;
177 for(i = 1; i < NSIG; i++) {
178 sigaction(i, &act, NULL);
181 memset(sigact_table, 0, sizeof(sigact_table));
183 first_free = &sigqueue_table[0];
184 for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
185 sigqueue_table[i].next = &sigqueue_table[i + 1];
186 sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
189 /* signal queue handling */
191 static inline struct sigqueue *alloc_sigqueue(void)
193 struct sigqueue *q = first_free;
196 first_free = q->next;
200 static inline void free_sigqueue(struct sigqueue *q)
202 q->next = first_free;
206 /* abort execution with signal */
207 void __attribute((noreturn)) force_sig(int sig)
210 host_sig = target_to_host_signal(sig);
211 fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
212 sig, strsignal(host_sig));
217 struct sigaction act;
218 sigemptyset(&act.sa_mask);
219 act.sa_flags = SA_SIGINFO;
220 act.sa_sigaction = SIG_DFL;
221 sigaction(SIGABRT, &act, NULL);
227 /* queue a signal so that it will be send to the virtual CPU as soon
229 int queue_signal(int sig, target_siginfo_t *info)
231 struct emulated_sigaction *k;
232 struct sigqueue *q, **pq;
233 target_ulong handler;
235 #if defined(DEBUG_SIGNAL)
236 fprintf(stderr, "queue_signal: sig=%d\n",
239 k = &sigact_table[sig - 1];
240 handler = k->sa._sa_handler;
241 if (handler == TARGET_SIG_DFL) {
242 /* default handler : ignore some signal. The other are fatal */
243 if (sig != TARGET_SIGCHLD &&
244 sig != TARGET_SIGURG &&
245 sig != TARGET_SIGWINCH) {
248 return 0; /* indicate ignored */
250 } else if (handler == TARGET_SIG_IGN) {
253 } else if (handler == TARGET_SIG_ERR) {
257 if (sig < TARGET_SIGRTMIN) {
258 /* if non real time signal, we queue exactly one signal */
268 q = alloc_sigqueue();
279 /* signal that a new signal is pending */
281 return 1; /* indicates that the signal was queued */
285 #if defined(DEBUG_SIGNAL)
287 static void dump_regs(struct ucontext *uc)
290 "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
291 "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
292 "EFL=%08x EIP=%08x\n",
293 uc->uc_mcontext.gregs[EAX],
294 uc->uc_mcontext.gregs[EBX],
295 uc->uc_mcontext.gregs[ECX],
296 uc->uc_mcontext.gregs[EDX],
297 uc->uc_mcontext.gregs[ESI],
298 uc->uc_mcontext.gregs[EDI],
299 uc->uc_mcontext.gregs[EBP],
300 uc->uc_mcontext.gregs[ESP],
301 uc->uc_mcontext.gregs[EFL],
302 uc->uc_mcontext.gregs[EIP]);
305 static void dump_regs(struct ucontext *uc)
312 static void host_signal_handler(int host_signum, siginfo_t *info,
316 target_siginfo_t tinfo;
318 /* the CPU emulator uses some host signals to detect exceptions,
319 we we forward to it some signals */
320 if (host_signum == SIGSEGV || host_signum == SIGBUS) {
321 if (cpu_signal_handler(host_signum, info, puc))
325 /* get target signal number */
326 sig = host_to_target_signal(host_signum);
327 if (sig < 1 || sig > TARGET_NSIG)
329 #if defined(DEBUG_SIGNAL)
330 fprintf(stderr, "qemu: got signal %d\n", sig);
333 host_to_target_siginfo_noswap(&tinfo, info);
334 if (queue_signal(sig, &tinfo) == 1) {
335 /* interrupt the virtual CPU as soon as possible */
336 cpu_interrupt(global_env);
340 int do_sigaction(int sig, const struct target_sigaction *act,
341 struct target_sigaction *oact)
343 struct emulated_sigaction *k;
345 if (sig < 1 || sig > TARGET_NSIG)
347 k = &sigact_table[sig - 1];
348 #if defined(DEBUG_SIGNAL) && 0
349 fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
350 sig, (int)act, (int)oact);
353 oact->_sa_handler = tswapl(k->sa._sa_handler);
354 oact->sa_flags = tswapl(k->sa.sa_flags);
355 oact->sa_restorer = tswapl(k->sa.sa_restorer);
356 oact->sa_mask = k->sa.sa_mask;
359 k->sa._sa_handler = tswapl(act->_sa_handler);
360 k->sa.sa_flags = tswapl(act->sa_flags);
361 k->sa.sa_restorer = tswapl(act->sa_restorer);
362 k->sa.sa_mask = act->sa_mask;
369 /* from the Linux kernel */
371 struct target_fpreg {
372 uint16_t significand[4];
376 struct target_fpxreg {
377 uint16_t significand[4];
382 struct target_xmmreg {
383 target_ulong element[4];
386 struct target_fpstate {
387 /* Regular FPU environment */
393 target_ulong dataoff;
394 target_ulong datasel;
395 struct target_fpreg _st[8];
397 uint16_t magic; /* 0xffff = regular FPU data only */
399 /* FXSR FPU environment */
400 target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
402 target_ulong reserved;
403 struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
404 struct target_xmmreg _xmm[8];
405 target_ulong padding[56];
408 #define X86_FXSR_MAGIC 0x0000
410 struct target_sigcontext {
428 target_ulong esp_at_signal;
430 target_ulong fpstate; /* pointer */
431 target_ulong oldmask;
435 typedef struct target_sigaltstack {
438 target_ulong ss_size;
441 struct target_ucontext {
442 target_ulong uc_flags;
443 target_ulong uc_link;
444 target_stack_t uc_stack;
445 struct target_sigcontext uc_mcontext;
446 target_sigset_t uc_sigmask; /* mask last for extensibility */
451 target_ulong pretcode;
453 struct target_sigcontext sc;
454 struct target_fpstate fpstate;
455 target_ulong extramask[TARGET_NSIG_WORDS-1];
461 target_ulong pretcode;
465 struct target_siginfo info;
466 struct target_ucontext uc;
467 struct target_fpstate fpstate;
472 * Set up a signal frame.
475 #define __put_user(x,ptr)\
477 int size = sizeof(*ptr);\
480 stb(ptr, (typeof(*ptr))(x));\
483 stw(ptr, (typeof(*ptr))(x));\
486 stl(ptr, (typeof(*ptr))(x));\
489 stq(ptr, (typeof(*ptr))(x));\
497 #define get_user(val, ptr) (typeof(*ptr))(*(ptr))
500 #define __copy_to_user(dst, src, size)\
502 memcpy(dst, src, size);\
506 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
507 const target_siginfo_t *info)
509 tswap_siginfo(tinfo, info);
513 /* XXX: save x87 state */
515 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
516 CPUX86State *env, unsigned long mask)
520 err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs);
521 err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs);
522 err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es);
523 err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds);
524 err |= __put_user(env->regs[R_EDI], &sc->edi);
525 err |= __put_user(env->regs[R_ESI], &sc->esi);
526 err |= __put_user(env->regs[R_EBP], &sc->ebp);
527 err |= __put_user(env->regs[R_ESP], &sc->esp);
528 err |= __put_user(env->regs[R_EBX], &sc->ebx);
529 err |= __put_user(env->regs[R_EDX], &sc->edx);
530 err |= __put_user(env->regs[R_ECX], &sc->ecx);
531 err |= __put_user(env->regs[R_EAX], &sc->eax);
532 err |= __put_user(env->exception_index, &sc->trapno);
533 err |= __put_user(env->error_code, &sc->err);
534 err |= __put_user(env->eip, &sc->eip);
535 err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs);
536 err |= __put_user(env->eflags, &sc->eflags);
537 err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
538 err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss);
540 cpu_x86_fsave(env, (void *)fpstate, 1);
541 fpstate->status = fpstate->sw;
542 err |= __put_user(0xffff, &fpstate->magic);
543 err |= __put_user(fpstate, &sc->fpstate);
545 /* non-iBCS2 extensions.. */
546 err |= __put_user(mask, &sc->oldmask);
547 err |= __put_user(env->cr2, &sc->cr2);
552 * Determine which stack to use..
556 get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
560 /* Default to using normal stack */
561 esp = env->regs[R_ESP];
563 /* This is the X/Open sanctioned signal stack switching. */
564 if (ka->sa.sa_flags & SA_ONSTACK) {
565 if (sas_ss_flags(esp) == 0)
566 esp = current->sas_ss_sp + current->sas_ss_size;
569 /* This is the legacy signal stack switching. */
570 else if ((regs->xss & 0xffff) != __USER_DS &&
571 !(ka->sa.sa_flags & SA_RESTORER) &&
572 ka->sa.sa_restorer) {
573 esp = (unsigned long) ka->sa.sa_restorer;
576 return (void *)((esp - frame_size) & -8ul);
579 static void setup_frame(int sig, struct emulated_sigaction *ka,
580 target_sigset_t *set, CPUX86State *env)
582 struct sigframe *frame;
585 frame = get_sigframe(ka, env, sizeof(*frame));
588 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
591 err |= __put_user((/*current->exec_domain
592 && current->exec_domain->signal_invmap
594 ? current->exec_domain->signal_invmap[sig]
600 setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
604 if (TARGET_NSIG_WORDS > 1) {
605 err |= __copy_to_user(frame->extramask, &set->sig[1],
606 sizeof(frame->extramask));
611 /* Set up to return from userspace. If provided, use a stub
612 already in userspace. */
613 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
614 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
616 err |= __put_user(frame->retcode, &frame->pretcode);
617 /* This is popl %eax ; movl $,%eax ; int $0x80 */
618 err |= __put_user(0xb858, (short *)(frame->retcode+0));
619 err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
620 err |= __put_user(0x80cd, (short *)(frame->retcode+6));
626 /* Set up registers for signal handler */
627 env->regs[R_ESP] = (unsigned long) frame;
628 env->eip = (unsigned long) ka->sa._sa_handler;
630 cpu_x86_load_seg(env, R_DS, __USER_DS);
631 cpu_x86_load_seg(env, R_ES, __USER_DS);
632 cpu_x86_load_seg(env, R_SS, __USER_DS);
633 cpu_x86_load_seg(env, R_CS, __USER_CS);
634 env->eflags &= ~TF_MASK;
639 if (sig == TARGET_SIGSEGV)
640 ka->sa._sa_handler = TARGET_SIG_DFL;
641 force_sig(TARGET_SIGSEGV /* , current */);
644 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
645 target_siginfo_t *info,
646 target_sigset_t *set, CPUX86State *env)
648 struct rt_sigframe *frame;
651 frame = get_sigframe(ka, env, sizeof(*frame));
654 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
658 err |= __put_user((/*current->exec_domain
659 && current->exec_domain->signal_invmap
661 ? current->exec_domain->signal_invmap[sig]
664 err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
665 err |= __put_user((target_ulong)&frame->uc, &frame->puc);
666 err |= copy_siginfo_to_user(&frame->info, info);
670 /* Create the ucontext. */
671 err |= __put_user(0, &frame->uc.uc_flags);
672 err |= __put_user(0, &frame->uc.uc_link);
673 err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
674 err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
675 &frame->uc.uc_stack.ss_flags);
676 err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
677 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
679 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
683 /* Set up to return from userspace. If provided, use a stub
684 already in userspace. */
685 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
686 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
688 err |= __put_user(frame->retcode, &frame->pretcode);
689 /* This is movl $,%eax ; int $0x80 */
690 err |= __put_user(0xb8, (char *)(frame->retcode+0));
691 err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
692 err |= __put_user(0x80cd, (short *)(frame->retcode+5));
698 /* Set up registers for signal handler */
699 env->regs[R_ESP] = (unsigned long) frame;
700 env->eip = (unsigned long) ka->sa._sa_handler;
702 cpu_x86_load_seg(env, R_DS, __USER_DS);
703 cpu_x86_load_seg(env, R_ES, __USER_DS);
704 cpu_x86_load_seg(env, R_SS, __USER_DS);
705 cpu_x86_load_seg(env, R_CS, __USER_CS);
706 env->eflags &= ~TF_MASK;
711 if (sig == TARGET_SIGSEGV)
712 ka->sa._sa_handler = TARGET_SIG_DFL;
713 force_sig(TARGET_SIGSEGV /* , current */);
717 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
719 unsigned int err = 0;
721 cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
722 cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
723 cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
724 cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
726 env->regs[R_EDI] = ldl(&sc->edi);
727 env->regs[R_ESI] = ldl(&sc->esi);
728 env->regs[R_EBP] = ldl(&sc->ebp);
729 env->regs[R_ESP] = ldl(&sc->esp);
730 env->regs[R_EBX] = ldl(&sc->ebx);
731 env->regs[R_EDX] = ldl(&sc->edx);
732 env->regs[R_ECX] = ldl(&sc->ecx);
733 env->eip = ldl(&sc->eip);
735 cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
736 cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
739 unsigned int tmpflags;
740 tmpflags = ldl(&sc->eflags);
741 env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
742 // regs->orig_eax = -1; /* disable syscall checks */
746 struct _fpstate * buf;
747 buf = (void *)ldl(&sc->fpstate);
750 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
753 cpu_x86_frstor(env, (void *)buf, 1);
757 *peax = ldl(&sc->eax);
765 long do_sigreturn(CPUX86State *env)
767 struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
768 target_sigset_t target_set;
772 #if defined(DEBUG_SIGNAL)
773 fprintf(stderr, "do_sigreturn\n");
775 /* set blocked signals */
776 target_set.sig[0] = frame->sc.oldmask;
777 for(i = 1; i < TARGET_NSIG_WORDS; i++)
778 target_set.sig[i] = frame->extramask[i - 1];
780 target_to_host_sigset(&set, &target_set);
781 sigprocmask(SIG_SETMASK, &set, NULL);
783 /* restore registers */
784 if (restore_sigcontext(env, &frame->sc, &eax))
789 force_sig(TARGET_SIGSEGV);
793 long do_rt_sigreturn(CPUX86State *env)
795 struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4);
796 target_sigset_t target_set;
802 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
805 memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
807 target_to_host_sigset(&set, &target_set);
808 sigprocmask(SIG_SETMASK, &set, NULL);
810 if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
814 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
816 /* It is more difficult to avoid calling this function than to
817 call it and ignore errors. */
818 do_sigaltstack(&st, NULL, regs->esp);
823 force_sig(TARGET_SIGSEGV);
829 static void setup_frame(int sig, struct emulated_sigaction *ka,
830 target_sigset_t *set, CPUState *env)
832 fprintf(stderr, "setup_frame: not implemented\n");
835 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
836 target_siginfo_t *info,
837 target_sigset_t *set, CPUState *env)
839 fprintf(stderr, "setup_rt_frame: not implemented\n");
842 long do_sigreturn(CPUState *env)
844 fprintf(stderr, "do_sigreturn: not implemented\n");
848 long do_rt_sigreturn(CPUState *env)
850 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
856 void process_pending_signals(void *cpu_env)
859 target_ulong handler;
860 sigset_t set, old_set;
861 target_sigset_t target_old_set;
862 struct emulated_sigaction *k;
869 for(sig = 1; sig <= TARGET_NSIG; sig++) {
874 /* if no signal is pending, just return */
880 fprintf(stderr, "qemu: process signal %d\n", sig);
888 handler = k->sa._sa_handler;
889 if (handler == TARGET_SIG_DFL) {
890 /* default handler : ignore some signal. The other are fatal */
891 if (sig != TARGET_SIGCHLD &&
892 sig != TARGET_SIGURG &&
893 sig != TARGET_SIGWINCH) {
896 } else if (handler == TARGET_SIG_IGN) {
898 } else if (handler == TARGET_SIG_ERR) {
901 /* compute the blocked signals during the handler execution */
902 target_to_host_sigset(&set, &k->sa.sa_mask);
903 /* SA_NODEFER indicates that the current signal should not be
904 blocked during the handler */
905 if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
906 sigaddset(&set, target_to_host_signal(sig));
908 /* block signals in the handler using Linux */
909 sigprocmask(SIG_BLOCK, &set, &old_set);
910 /* save the previous blocked signal state to restore it at the
911 end of the signal execution (see do_sigreturn) */
912 host_to_target_sigset(&target_old_set, &old_set);
914 /* if the CPU is in VM86 mode, we restore the 32 bit values */
917 CPUX86State *env = cpu_env;
918 if (env->eflags & VM_MASK)
922 /* prepare the stack frame of the virtual CPU */
923 if (k->sa.sa_flags & TARGET_SA_SIGINFO)
924 setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
926 setup_frame(sig, k, &target_old_set, cpu_env);
927 if (k->sa.sa_flags & TARGET_SA_RESETHAND)
928 k->sa._sa_handler = TARGET_SIG_DFL;