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>
31 //#define DEBUG_SIGNAL
33 #define MAX_SIGQUEUE_SIZE 1024
36 struct sigqueue *next;
37 target_siginfo_t info;
40 struct emulated_sigaction {
41 struct target_sigaction sa;
42 int pending; /* true if signal is pending */
43 struct sigqueue *first;
44 struct sigqueue info; /* in order to always have memory for the
45 first signal, we put it here */
48 static struct emulated_sigaction sigact_table[TARGET_NSIG];
49 static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
50 static struct sigqueue *first_free; /* first free siginfo queue entry */
51 static int signal_pending; /* non zero if a signal may be pending */
53 static void host_signal_handler(int host_signum, siginfo_t *info,
56 /* XXX: do it properly */
57 static inline int host_to_target_signal(int sig)
62 static inline int target_to_host_signal(int sig)
67 void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
70 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
71 d->sig[i] = tswapl(((unsigned long *)s)[i]);
75 void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
78 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
79 ((unsigned long *)d)[i] = tswapl(s->sig[i]);
83 void host_to_target_old_sigset(target_ulong *old_sigset,
84 const sigset_t *sigset)
86 *old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff);
89 void target_to_host_old_sigset(sigset_t *sigset,
90 const target_ulong *old_sigset)
93 *(unsigned long *)sigset = tswapl(*old_sigset);
96 /* siginfo conversion */
98 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
99 const siginfo_t *info)
102 sig = host_to_target_signal(info->si_signo);
103 tinfo->si_signo = sig;
106 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
107 /* should never come here, but who knows. The information for
108 the target is irrelevant */
109 tinfo->_sifields._sigfault._addr = 0;
110 } else if (sig >= TARGET_SIGRTMIN) {
111 tinfo->_sifields._rt._pid = info->si_pid;
112 tinfo->_sifields._rt._uid = info->si_uid;
113 /* XXX: potential problem if 64 bit */
114 tinfo->_sifields._rt._sigval.sival_ptr =
115 (target_ulong)info->si_value.sival_ptr;
119 static void tswap_siginfo(target_siginfo_t *tinfo,
120 const target_siginfo_t *info)
123 sig = info->si_signo;
124 tinfo->si_signo = tswap32(sig);
125 tinfo->si_errno = tswap32(info->si_errno);
126 tinfo->si_code = tswap32(info->si_code);
127 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
128 tinfo->_sifields._sigfault._addr =
129 tswapl(info->_sifields._sigfault._addr);
130 } else if (sig >= TARGET_SIGRTMIN) {
131 tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
132 tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
133 tinfo->_sifields._rt._sigval.sival_ptr =
134 tswapl(info->_sifields._rt._sigval.sival_ptr);
139 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
141 host_to_target_siginfo_noswap(tinfo, info);
142 tswap_siginfo(tinfo, tinfo);
145 /* XXX: we support only POSIX RT signals are used. */
146 /* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
147 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
149 info->si_signo = tswap32(tinfo->si_signo);
150 info->si_errno = tswap32(tinfo->si_errno);
151 info->si_code = tswap32(tinfo->si_code);
152 info->si_pid = tswap32(tinfo->_sifields._rt._pid);
153 info->si_uid = tswap32(tinfo->_sifields._rt._uid);
154 info->si_value.sival_ptr =
155 (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
158 void signal_init(void)
160 struct sigaction act;
163 /* set all host signal handlers. ALL signals are blocked during
164 the handlers to serialize them. */
165 sigfillset(&act.sa_mask);
166 act.sa_flags = SA_SIGINFO;
167 act.sa_sigaction = host_signal_handler;
168 for(i = 1; i < NSIG; i++) {
169 sigaction(i, &act, NULL);
172 memset(sigact_table, 0, sizeof(sigact_table));
174 first_free = &sigqueue_table[0];
175 for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
176 sigqueue_table[i].next = &sigqueue_table[i + 1];
177 sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
180 /* signal queue handling */
182 static inline struct sigqueue *alloc_sigqueue(void)
184 struct sigqueue *q = first_free;
187 first_free = q->next;
191 static inline void free_sigqueue(struct sigqueue *q)
193 q->next = first_free;
197 /* abort execution with signal */
198 void __attribute((noreturn)) force_sig(int sig)
201 host_sig = target_to_host_signal(sig);
202 fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
203 sig, strsignal(host_sig));
208 struct sigaction act;
209 sigemptyset(&act.sa_mask);
210 act.sa_flags = SA_SIGINFO;
211 act.sa_sigaction = SIG_DFL;
212 sigaction(SIGABRT, &act, NULL);
218 /* queue a signal so that it will be send to the virtual CPU as soon
220 int queue_signal(int sig, target_siginfo_t *info)
222 struct emulated_sigaction *k;
223 struct sigqueue *q, **pq;
224 target_ulong handler;
226 #if defined(DEBUG_SIGNAL)
227 fprintf(stderr, "queue_signal: sig=%d\n",
230 k = &sigact_table[sig - 1];
231 handler = k->sa._sa_handler;
232 if (handler == TARGET_SIG_DFL) {
233 /* default handler : ignore some signal. The other are fatal */
234 if (sig != TARGET_SIGCHLD &&
235 sig != TARGET_SIGURG &&
236 sig != TARGET_SIGWINCH) {
239 return 0; /* indicate ignored */
241 } else if (handler == TARGET_SIG_IGN) {
244 } else if (handler == TARGET_SIG_ERR) {
248 if (sig < TARGET_SIGRTMIN) {
249 /* if non real time signal, we queue exactly one signal */
259 q = alloc_sigqueue();
270 /* signal that a new signal is pending */
272 return 1; /* indicates that the signal was queued */
276 #if defined(DEBUG_SIGNAL)
278 static void dump_regs(struct ucontext *uc)
281 "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
282 "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
283 "EFL=%08x EIP=%08x\n",
284 uc->uc_mcontext.gregs[EAX],
285 uc->uc_mcontext.gregs[EBX],
286 uc->uc_mcontext.gregs[ECX],
287 uc->uc_mcontext.gregs[EDX],
288 uc->uc_mcontext.gregs[ESI],
289 uc->uc_mcontext.gregs[EDI],
290 uc->uc_mcontext.gregs[EBP],
291 uc->uc_mcontext.gregs[ESP],
292 uc->uc_mcontext.gregs[EFL],
293 uc->uc_mcontext.gregs[EIP]);
296 static void dump_regs(struct ucontext *uc)
303 static void host_signal_handler(int host_signum, siginfo_t *info,
307 target_siginfo_t tinfo;
309 /* the CPU emulator uses some host signals to detect exceptions,
310 we we forward to it some signals */
311 if (host_signum == SIGSEGV || host_signum == SIGBUS) {
312 if (cpu_x86_signal_handler(host_signum, info, puc))
316 /* get target signal number */
317 sig = host_to_target_signal(host_signum);
318 if (sig < 1 || sig > TARGET_NSIG)
320 #if defined(DEBUG_SIGNAL)
321 fprintf(stderr, "qemu: got signal %d\n", sig);
324 host_to_target_siginfo_noswap(&tinfo, info);
325 if (queue_signal(sig, &tinfo) == 1) {
326 /* interrupt the virtual CPU as soon as possible */
327 cpu_x86_interrupt(global_env);
331 int do_sigaction(int sig, const struct target_sigaction *act,
332 struct target_sigaction *oact)
334 struct emulated_sigaction *k;
336 if (sig < 1 || sig > TARGET_NSIG)
338 k = &sigact_table[sig - 1];
339 #if defined(DEBUG_SIGNAL) && 0
340 fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
341 sig, (int)act, (int)oact);
344 oact->_sa_handler = tswapl(k->sa._sa_handler);
345 oact->sa_flags = tswapl(k->sa.sa_flags);
346 oact->sa_restorer = tswapl(k->sa.sa_restorer);
347 oact->sa_mask = k->sa.sa_mask;
350 k->sa._sa_handler = tswapl(act->_sa_handler);
351 k->sa.sa_flags = tswapl(act->sa_flags);
352 k->sa.sa_restorer = tswapl(act->sa_restorer);
353 k->sa.sa_mask = act->sa_mask;
360 /* from the Linux kernel */
362 struct target_fpreg {
363 uint16_t significand[4];
367 struct target_fpxreg {
368 uint16_t significand[4];
373 struct target_xmmreg {
374 target_ulong element[4];
377 struct target_fpstate {
378 /* Regular FPU environment */
384 target_ulong dataoff;
385 target_ulong datasel;
386 struct target_fpreg _st[8];
388 uint16_t magic; /* 0xffff = regular FPU data only */
390 /* FXSR FPU environment */
391 target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
393 target_ulong reserved;
394 struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
395 struct target_xmmreg _xmm[8];
396 target_ulong padding[56];
399 #define X86_FXSR_MAGIC 0x0000
401 struct target_sigcontext {
419 target_ulong esp_at_signal;
421 target_ulong fpstate; /* pointer */
422 target_ulong oldmask;
426 typedef struct target_sigaltstack {
429 target_ulong ss_size;
432 struct target_ucontext {
433 target_ulong uc_flags;
434 target_ulong uc_link;
435 target_stack_t uc_stack;
436 struct target_sigcontext uc_mcontext;
437 target_sigset_t uc_sigmask; /* mask last for extensibility */
442 target_ulong pretcode;
444 struct target_sigcontext sc;
445 struct target_fpstate fpstate;
446 target_ulong extramask[TARGET_NSIG_WORDS-1];
452 target_ulong pretcode;
456 struct target_siginfo info;
457 struct target_ucontext uc;
458 struct target_fpstate fpstate;
463 * Set up a signal frame.
466 #define __put_user(x,ptr)\
468 int size = sizeof(*ptr);\
471 stb(ptr, (typeof(*ptr))(x));\
474 stw(ptr, (typeof(*ptr))(x));\
477 stl(ptr, (typeof(*ptr))(x));\
480 stq(ptr, (typeof(*ptr))(x));\
488 #define get_user(val, ptr) (typeof(*ptr))(*(ptr))
491 #define __copy_to_user(dst, src, size)\
493 memcpy(dst, src, size);\
497 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
498 const target_siginfo_t *info)
500 tswap_siginfo(tinfo, info);
504 /* XXX: save x87 state */
506 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
507 CPUX86State *env, unsigned long mask)
511 err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs);
512 err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs);
513 err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es);
514 err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds);
515 err |= __put_user(env->regs[R_EDI], &sc->edi);
516 err |= __put_user(env->regs[R_ESI], &sc->esi);
517 err |= __put_user(env->regs[R_EBP], &sc->ebp);
518 err |= __put_user(env->regs[R_ESP], &sc->esp);
519 err |= __put_user(env->regs[R_EBX], &sc->ebx);
520 err |= __put_user(env->regs[R_EDX], &sc->edx);
521 err |= __put_user(env->regs[R_ECX], &sc->ecx);
522 err |= __put_user(env->regs[R_EAX], &sc->eax);
523 err |= __put_user(/*current->thread.trap_no*/ 0, &sc->trapno);
524 err |= __put_user(/*current->thread.error_code*/ 0, &sc->err);
525 err |= __put_user(env->eip, &sc->eip);
526 err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs);
527 err |= __put_user(env->eflags, &sc->eflags);
528 err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
529 err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss);
531 tmp = save_i387(fpstate);
535 err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
537 err |= __put_user(0, &sc->fpstate);
539 /* non-iBCS2 extensions.. */
540 err |= __put_user(mask, &sc->oldmask);
541 err |= __put_user(/*current->thread.cr2*/ 0, &sc->cr2);
546 * Determine which stack to use..
550 get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
554 /* Default to using normal stack */
555 esp = env->regs[R_ESP];
557 /* This is the X/Open sanctioned signal stack switching. */
558 if (ka->sa.sa_flags & SA_ONSTACK) {
559 if (sas_ss_flags(esp) == 0)
560 esp = current->sas_ss_sp + current->sas_ss_size;
563 /* This is the legacy signal stack switching. */
564 else if ((regs->xss & 0xffff) != __USER_DS &&
565 !(ka->sa.sa_flags & SA_RESTORER) &&
566 ka->sa.sa_restorer) {
567 esp = (unsigned long) ka->sa.sa_restorer;
570 return (void *)((esp - frame_size) & -8ul);
573 static void setup_frame(int sig, struct emulated_sigaction *ka,
574 target_sigset_t *set, CPUX86State *env)
576 struct sigframe *frame;
579 frame = get_sigframe(ka, env, sizeof(*frame));
582 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
585 err |= __put_user((/*current->exec_domain
586 && current->exec_domain->signal_invmap
588 ? current->exec_domain->signal_invmap[sig]
594 setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
598 if (TARGET_NSIG_WORDS > 1) {
599 err |= __copy_to_user(frame->extramask, &set->sig[1],
600 sizeof(frame->extramask));
605 /* Set up to return from userspace. If provided, use a stub
606 already in userspace. */
607 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
608 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
610 err |= __put_user(frame->retcode, &frame->pretcode);
611 /* This is popl %eax ; movl $,%eax ; int $0x80 */
612 err |= __put_user(0xb858, (short *)(frame->retcode+0));
613 err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
614 err |= __put_user(0x80cd, (short *)(frame->retcode+6));
620 /* Set up registers for signal handler */
621 env->regs[R_ESP] = (unsigned long) frame;
622 env->eip = (unsigned long) ka->sa._sa_handler;
624 cpu_x86_load_seg(env, R_DS, __USER_DS);
625 cpu_x86_load_seg(env, R_ES, __USER_DS);
626 cpu_x86_load_seg(env, R_SS, __USER_DS);
627 cpu_x86_load_seg(env, R_CS, __USER_CS);
628 env->eflags &= ~TF_MASK;
633 if (sig == TARGET_SIGSEGV)
634 ka->sa._sa_handler = TARGET_SIG_DFL;
635 force_sig(TARGET_SIGSEGV /* , current */);
638 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
639 target_siginfo_t *info,
640 target_sigset_t *set, CPUX86State *env)
642 struct rt_sigframe *frame;
645 frame = get_sigframe(ka, env, sizeof(*frame));
648 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
652 err |= __put_user((/*current->exec_domain
653 && current->exec_domain->signal_invmap
655 ? current->exec_domain->signal_invmap[sig]
658 err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
659 err |= __put_user((target_ulong)&frame->uc, &frame->puc);
660 err |= copy_siginfo_to_user(&frame->info, info);
664 /* Create the ucontext. */
665 err |= __put_user(0, &frame->uc.uc_flags);
666 err |= __put_user(0, &frame->uc.uc_link);
667 err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
668 err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
669 &frame->uc.uc_stack.ss_flags);
670 err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
671 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
673 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
677 /* Set up to return from userspace. If provided, use a stub
678 already in userspace. */
679 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
680 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
682 err |= __put_user(frame->retcode, &frame->pretcode);
683 /* This is movl $,%eax ; int $0x80 */
684 err |= __put_user(0xb8, (char *)(frame->retcode+0));
685 err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
686 err |= __put_user(0x80cd, (short *)(frame->retcode+5));
692 /* Set up registers for signal handler */
693 env->regs[R_ESP] = (unsigned long) frame;
694 env->eip = (unsigned long) ka->sa._sa_handler;
696 cpu_x86_load_seg(env, R_DS, __USER_DS);
697 cpu_x86_load_seg(env, R_ES, __USER_DS);
698 cpu_x86_load_seg(env, R_SS, __USER_DS);
699 cpu_x86_load_seg(env, R_CS, __USER_CS);
700 env->eflags &= ~TF_MASK;
705 if (sig == TARGET_SIGSEGV)
706 ka->sa._sa_handler = TARGET_SIG_DFL;
707 force_sig(TARGET_SIGSEGV /* , current */);
711 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
713 unsigned int err = 0;
717 #define COPY(x) err |= __get_user(regs->x, &sc->x)
719 #define COPY_SEG(seg) \
720 { unsigned short tmp; \
721 err |= __get_user(tmp, &sc->seg); \
722 regs->x##seg = tmp; }
724 #define COPY_SEG_STRICT(seg) \
725 { unsigned short tmp; \
726 err |= __get_user(tmp, &sc->seg); \
727 regs->x##seg = tmp|3; }
729 #define GET_SEG(seg) \
730 { unsigned short tmp; \
731 err |= __get_user(tmp, &sc->seg); \
732 loadsegment(seg,tmp); }
734 cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
735 cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
736 cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
737 cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
739 env->regs[R_EDI] = ldl(&sc->edi);
740 env->regs[R_ESI] = ldl(&sc->esi);
741 env->regs[R_EBP] = ldl(&sc->ebp);
742 env->regs[R_ESP] = ldl(&sc->esp);
743 env->regs[R_EBX] = ldl(&sc->ebx);
744 env->regs[R_EDX] = ldl(&sc->edx);
745 env->regs[R_ECX] = ldl(&sc->ecx);
746 env->eip = ldl(&sc->eip);
748 cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
749 cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
752 unsigned int tmpflags;
753 tmpflags = ldl(&sc->eflags);
754 env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
755 // regs->orig_eax = -1; /* disable syscall checks */
760 struct _fpstate * buf;
761 err |= __get_user(buf, &sc->fpstate);
763 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
765 err |= restore_i387(buf);
769 *peax = ldl(&sc->eax);
777 long do_sigreturn(CPUX86State *env)
779 struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
780 target_sigset_t target_set;
784 /* set blocked signals */
785 target_set.sig[0] = frame->sc.oldmask;
786 for(i = 1; i < TARGET_NSIG_WORDS; i++)
787 target_set.sig[i] = frame->extramask[i - 1];
789 target_to_host_sigset(&set, &target_set);
790 sigprocmask(SIG_SETMASK, &set, NULL);
792 /* restore registers */
793 if (restore_sigcontext(env, &frame->sc, &eax))
798 force_sig(TARGET_SIGSEGV);
802 long do_rt_sigreturn(CPUX86State *env)
804 struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4);
805 target_sigset_t target_set;
811 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
814 memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
816 target_to_host_sigset(&set, &target_set);
817 sigprocmask(SIG_SETMASK, &set, NULL);
819 if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
823 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
825 /* It is more difficult to avoid calling this function than to
826 call it and ignore errors. */
827 do_sigaltstack(&st, NULL, regs->esp);
832 force_sig(TARGET_SIGSEGV);
838 void process_pending_signals(void *cpu_env)
841 target_ulong handler;
842 sigset_t set, old_set;
843 target_sigset_t target_old_set;
844 struct emulated_sigaction *k;
851 for(sig = 1; sig <= TARGET_NSIG; sig++) {
856 /* if no signal is pending, just return */
862 fprintf(stderr, "qemu: process signal %d\n", sig);
870 handler = k->sa._sa_handler;
871 if (handler == TARGET_SIG_DFL) {
872 /* default handler : ignore some signal. The other are fatal */
873 if (sig != TARGET_SIGCHLD &&
874 sig != TARGET_SIGURG &&
875 sig != TARGET_SIGWINCH) {
878 } else if (handler == TARGET_SIG_IGN) {
880 } else if (handler == TARGET_SIG_ERR) {
883 /* compute the blocked signals during the handler execution */
884 target_to_host_sigset(&set, &k->sa.sa_mask);
885 /* SA_NODEFER indicates that the current signal should not be
886 blocked during the handler */
887 if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
888 sigaddset(&set, target_to_host_signal(sig));
890 /* block signals in the handler using Linux */
891 sigprocmask(SIG_BLOCK, &set, &old_set);
892 /* save the previous blocked signal state to restore it at the
893 end of the signal execution (see do_sigreturn) */
894 host_to_target_sigset(&target_old_set, &old_set);
896 /* if the CPU is in VM86 mode, we restore the 32 bit values */
899 CPUX86State *env = cpu_env;
900 if (env->eflags & VM_MASK)
904 /* prepare the stack frame of the virtual CPU */
905 if (k->sa.sa_flags & TARGET_SA_SIGINFO)
906 setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
908 setup_frame(sig, k, &target_old_set, cpu_env);
909 if (k->sa.sa_flags & TARGET_SA_RESETHAND)
910 k->sa._sa_handler = TARGET_SIG_DFL;