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.
26 #include <sys/ucontext.h>
30 //#define DEBUG_SIGNAL
32 #define MAX_SIGQUEUE_SIZE 1024
35 struct sigqueue *next;
36 target_siginfo_t info;
39 struct emulated_sigaction {
40 struct target_sigaction sa;
41 int pending; /* true if signal is pending */
42 struct sigqueue *first;
43 struct sigqueue info; /* in order to always have memory for the
44 first signal, we put it here */
47 static struct emulated_sigaction sigact_table[TARGET_NSIG];
48 static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
49 static struct sigqueue *first_free; /* first free siginfo queue entry */
50 static int signal_pending; /* non zero if a signal may be pending */
52 static void host_signal_handler(int host_signum, siginfo_t *info,
55 /* XXX: do it properly */
56 static inline int host_to_target_signal(int sig)
61 static inline int target_to_host_signal(int sig)
66 void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
69 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
70 d->sig[i] = tswapl(((unsigned long *)s)[i]);
74 void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
77 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
78 ((unsigned long *)d)[i] = tswapl(s->sig[i]);
82 void host_to_target_old_sigset(target_ulong *old_sigset,
83 const sigset_t *sigset)
85 *old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff);
88 void target_to_host_old_sigset(sigset_t *sigset,
89 const target_ulong *old_sigset)
92 *(unsigned long *)sigset = tswapl(*old_sigset);
95 /* siginfo conversion */
97 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
98 const siginfo_t *info)
101 sig = host_to_target_signal(info->si_signo);
102 tinfo->si_signo = sig;
105 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
106 /* should never come here, but who knows. The information for
107 the target is irrelevant */
108 tinfo->_sifields._sigfault._addr = 0;
109 } else if (sig >= TARGET_SIGRTMIN) {
110 tinfo->_sifields._rt._pid = info->si_pid;
111 tinfo->_sifields._rt._uid = info->si_uid;
112 /* XXX: potential problem if 64 bit */
113 tinfo->_sifields._rt._sigval.sival_ptr =
114 (target_ulong)info->si_value.sival_ptr;
118 static void tswap_siginfo(target_siginfo_t *tinfo,
119 const target_siginfo_t *info)
122 sig = info->si_signo;
123 tinfo->si_signo = tswap32(sig);
124 tinfo->si_errno = tswap32(info->si_errno);
125 tinfo->si_code = tswap32(info->si_code);
126 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
127 tinfo->_sifields._sigfault._addr =
128 tswapl(info->_sifields._sigfault._addr);
129 } else if (sig >= TARGET_SIGRTMIN) {
130 tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
131 tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
132 tinfo->_sifields._rt._sigval.sival_ptr =
133 tswapl(info->_sifields._rt._sigval.sival_ptr);
138 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
140 host_to_target_siginfo_noswap(tinfo, info);
141 tswap_siginfo(tinfo, tinfo);
144 /* XXX: we support only POSIX RT signals are used. */
145 /* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
146 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
148 info->si_signo = tswap32(tinfo->si_signo);
149 info->si_errno = tswap32(tinfo->si_errno);
150 info->si_code = tswap32(tinfo->si_code);
151 info->si_pid = tswap32(tinfo->_sifields._rt._pid);
152 info->si_uid = tswap32(tinfo->_sifields._rt._uid);
153 info->si_value.sival_ptr =
154 (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
157 void signal_init(void)
159 struct sigaction act;
162 /* set all host signal handlers. ALL signals are blocked during
163 the handlers to serialize them. */
164 sigfillset(&act.sa_mask);
165 act.sa_flags = SA_SIGINFO;
166 act.sa_sigaction = host_signal_handler;
167 for(i = 1; i < NSIG; i++) {
168 sigaction(i, &act, NULL);
171 memset(sigact_table, 0, sizeof(sigact_table));
173 first_free = &sigqueue_table[0];
174 for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
175 sigqueue_table[i].next = &sigqueue_table[i + 1];
176 sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
179 /* signal queue handling */
181 static inline struct sigqueue *alloc_sigqueue(void)
183 struct sigqueue *q = first_free;
186 first_free = q->next;
190 static inline void free_sigqueue(struct sigqueue *q)
192 q->next = first_free;
196 /* abort execution with signal */
197 void __attribute((noreturn)) force_sig(int sig)
200 host_sig = target_to_host_signal(sig);
201 fprintf(stderr, "gemu: uncaught target signal %d (%s) - exiting\n",
202 sig, strsignal(host_sig));
207 struct sigaction act;
208 sigemptyset(&act.sa_mask);
209 act.sa_flags = SA_SIGINFO;
210 act.sa_sigaction = SIG_DFL;
211 sigaction(SIGABRT, &act, NULL);
217 /* queue a signal so that it will be send to the virtual CPU as soon
219 int queue_signal(int sig, target_siginfo_t *info)
221 struct emulated_sigaction *k;
222 struct sigqueue *q, **pq;
223 target_ulong handler;
225 #if defined(DEBUG_SIGNAL)
226 fprintf(stderr, "queue_sigal: sig=%d\n",
229 k = &sigact_table[sig - 1];
230 handler = k->sa._sa_handler;
231 if (handler == TARGET_SIG_DFL) {
232 /* default handler : ignore some signal. The other are fatal */
233 if (sig != TARGET_SIGCHLD &&
234 sig != TARGET_SIGURG &&
235 sig != TARGET_SIGWINCH) {
238 return 0; /* indicate ignored */
240 } else if (handler == TARGET_SIG_IGN) {
243 } else if (handler == TARGET_SIG_ERR) {
247 if (sig < TARGET_SIGRTMIN) {
248 /* if non real time signal, we queue exactly one signal */
258 q = alloc_sigqueue();
269 /* signal that a new signal is pending */
271 return 1; /* indicates that the signal was queued */
275 #if defined(DEBUG_SIGNAL)
277 static void dump_regs(struct ucontext *uc)
280 "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
281 "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
282 "EFL=%08x EIP=%08x\n",
283 uc->uc_mcontext.gregs[EAX],
284 uc->uc_mcontext.gregs[EBX],
285 uc->uc_mcontext.gregs[ECX],
286 uc->uc_mcontext.gregs[EDX],
287 uc->uc_mcontext.gregs[ESI],
288 uc->uc_mcontext.gregs[EDI],
289 uc->uc_mcontext.gregs[EBP],
290 uc->uc_mcontext.gregs[ESP],
291 uc->uc_mcontext.gregs[EFL],
292 uc->uc_mcontext.gregs[EIP]);
295 static void dump_regs(struct ucontext *uc)
302 static void host_signal_handler(int host_signum, siginfo_t *info,
306 target_siginfo_t tinfo;
308 /* the CPU emulator uses some host signals to detect exceptions,
309 we we forward to it some signals */
310 if (host_signum == SIGSEGV || host_signum == SIGBUS) {
311 if (cpu_x86_signal_handler(host_signum, info, puc))
315 /* get target signal number */
316 sig = host_to_target_signal(host_signum);
317 if (sig < 1 || sig > TARGET_NSIG)
319 #if defined(DEBUG_SIGNAL)
320 fprintf(stderr, "gemu: got signal %d\n", sig);
323 host_to_target_siginfo_noswap(&tinfo, info);
324 if (queue_signal(sig, &tinfo) == 1) {
325 /* interrupt the virtual CPU as soon as possible */
326 cpu_x86_interrupt(global_env);
330 int do_sigaction(int sig, const struct target_sigaction *act,
331 struct target_sigaction *oact)
333 struct emulated_sigaction *k;
335 if (sig < 1 || sig > TARGET_NSIG)
337 k = &sigact_table[sig - 1];
338 #if defined(DEBUG_SIGNAL) && 0
339 fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
340 sig, (int)act, (int)oact);
343 oact->_sa_handler = tswapl(k->sa._sa_handler);
344 oact->sa_flags = tswapl(k->sa.sa_flags);
345 oact->sa_restorer = tswapl(k->sa.sa_restorer);
346 oact->sa_mask = k->sa.sa_mask;
349 k->sa._sa_handler = tswapl(act->_sa_handler);
350 k->sa.sa_flags = tswapl(act->sa_flags);
351 k->sa.sa_restorer = tswapl(act->sa_restorer);
352 k->sa.sa_mask = act->sa_mask;
359 /* from the Linux kernel */
361 struct target_fpreg {
362 uint16_t significand[4];
366 struct target_fpxreg {
367 uint16_t significand[4];
372 struct target_xmmreg {
373 target_ulong element[4];
376 struct target_fpstate {
377 /* Regular FPU environment */
383 target_ulong dataoff;
384 target_ulong datasel;
385 struct target_fpreg _st[8];
387 uint16_t magic; /* 0xffff = regular FPU data only */
389 /* FXSR FPU environment */
390 target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
392 target_ulong reserved;
393 struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
394 struct target_xmmreg _xmm[8];
395 target_ulong padding[56];
398 #define X86_FXSR_MAGIC 0x0000
400 struct target_sigcontext {
418 target_ulong esp_at_signal;
420 target_ulong fpstate; /* pointer */
421 target_ulong oldmask;
425 typedef struct target_sigaltstack {
428 target_ulong ss_size;
431 struct target_ucontext {
432 target_ulong uc_flags;
433 target_ulong uc_link;
434 target_stack_t uc_stack;
435 struct target_sigcontext uc_mcontext;
436 target_sigset_t uc_sigmask; /* mask last for extensibility */
441 target_ulong pretcode;
443 struct target_sigcontext sc;
444 struct target_fpstate fpstate;
445 target_ulong extramask[TARGET_NSIG_WORDS-1];
451 target_ulong pretcode;
455 struct target_siginfo info;
456 struct target_ucontext uc;
457 struct target_fpstate fpstate;
462 * Set up a signal frame.
465 #define __put_user(x,ptr)\
467 int size = sizeof(*ptr);\
470 stb(ptr, (typeof(*ptr))(x));\
473 stw(ptr, (typeof(*ptr))(x));\
476 stl(ptr, (typeof(*ptr))(x));\
479 stq(ptr, (typeof(*ptr))(x));\
487 #define get_user(val, ptr) (typeof(*ptr))(*(ptr))
490 #define __copy_to_user(dst, src, size)\
492 memcpy(dst, src, size);\
496 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
497 const target_siginfo_t *info)
499 tswap_siginfo(tinfo, info);
503 /* XXX: save x87 state */
505 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
506 CPUX86State *env, unsigned long mask)
510 err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs);
511 err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs);
512 err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es);
513 err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds);
514 err |= __put_user(env->regs[R_EDI], &sc->edi);
515 err |= __put_user(env->regs[R_ESI], &sc->esi);
516 err |= __put_user(env->regs[R_EBP], &sc->ebp);
517 err |= __put_user(env->regs[R_ESP], &sc->esp);
518 err |= __put_user(env->regs[R_EBX], &sc->ebx);
519 err |= __put_user(env->regs[R_EDX], &sc->edx);
520 err |= __put_user(env->regs[R_ECX], &sc->ecx);
521 err |= __put_user(env->regs[R_EAX], &sc->eax);
522 err |= __put_user(/*current->thread.trap_no*/ 0, &sc->trapno);
523 err |= __put_user(/*current->thread.error_code*/ 0, &sc->err);
524 err |= __put_user(env->eip, &sc->eip);
525 err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs);
526 err |= __put_user(env->eflags, &sc->eflags);
527 err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
528 err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss);
530 tmp = save_i387(fpstate);
534 err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
536 err |= __put_user(0, &sc->fpstate);
538 /* non-iBCS2 extensions.. */
539 err |= __put_user(mask, &sc->oldmask);
540 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 #define TF_MASK TRAP_FLAG
575 static void setup_frame(int sig, struct emulated_sigaction *ka,
576 target_sigset_t *set, CPUX86State *env)
578 struct sigframe *frame;
581 frame = get_sigframe(ka, env, sizeof(*frame));
584 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
587 err |= __put_user((/*current->exec_domain
588 && current->exec_domain->signal_invmap
590 ? current->exec_domain->signal_invmap[sig]
596 setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
600 if (TARGET_NSIG_WORDS > 1) {
601 err |= __copy_to_user(frame->extramask, &set->sig[1],
602 sizeof(frame->extramask));
607 /* Set up to return from userspace. If provided, use a stub
608 already in userspace. */
609 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
610 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
612 err |= __put_user(frame->retcode, &frame->pretcode);
613 /* This is popl %eax ; movl $,%eax ; int $0x80 */
614 err |= __put_user(0xb858, (short *)(frame->retcode+0));
615 err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
616 err |= __put_user(0x80cd, (short *)(frame->retcode+6));
622 /* Set up registers for signal handler */
623 env->regs[R_ESP] = (unsigned long) frame;
624 env->eip = (unsigned long) ka->sa._sa_handler;
626 cpu_x86_load_seg(env, R_DS, __USER_DS);
627 cpu_x86_load_seg(env, R_ES, __USER_DS);
628 cpu_x86_load_seg(env, R_SS, __USER_DS);
629 cpu_x86_load_seg(env, R_CS, __USER_CS);
630 env->eflags &= ~TF_MASK;
635 if (sig == TARGET_SIGSEGV)
636 ka->sa._sa_handler = TARGET_SIG_DFL;
637 force_sig(TARGET_SIGSEGV /* , current */);
640 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
641 target_siginfo_t *info,
642 target_sigset_t *set, CPUX86State *env)
644 struct rt_sigframe *frame;
647 frame = get_sigframe(ka, env, sizeof(*frame));
650 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
654 err |= __put_user((/*current->exec_domain
655 && current->exec_domain->signal_invmap
657 ? current->exec_domain->signal_invmap[sig]
660 err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
661 err |= __put_user((target_ulong)&frame->uc, &frame->puc);
662 err |= copy_siginfo_to_user(&frame->info, info);
666 /* Create the ucontext. */
667 err |= __put_user(0, &frame->uc.uc_flags);
668 err |= __put_user(0, &frame->uc.uc_link);
669 err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
670 err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
671 &frame->uc.uc_stack.ss_flags);
672 err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
673 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
675 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
679 /* Set up to return from userspace. If provided, use a stub
680 already in userspace. */
681 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
682 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
684 err |= __put_user(frame->retcode, &frame->pretcode);
685 /* This is movl $,%eax ; int $0x80 */
686 err |= __put_user(0xb8, (char *)(frame->retcode+0));
687 err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
688 err |= __put_user(0x80cd, (short *)(frame->retcode+5));
694 /* Set up registers for signal handler */
695 env->regs[R_ESP] = (unsigned long) frame;
696 env->eip = (unsigned long) ka->sa._sa_handler;
698 cpu_x86_load_seg(env, R_DS, __USER_DS);
699 cpu_x86_load_seg(env, R_ES, __USER_DS);
700 cpu_x86_load_seg(env, R_SS, __USER_DS);
701 cpu_x86_load_seg(env, R_CS, __USER_CS);
702 env->eflags &= ~TF_MASK;
707 if (sig == TARGET_SIGSEGV)
708 ka->sa._sa_handler = TARGET_SIG_DFL;
709 force_sig(TARGET_SIGSEGV /* , current */);
713 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
715 unsigned int err = 0;
719 #define COPY(x) err |= __get_user(regs->x, &sc->x)
721 #define COPY_SEG(seg) \
722 { unsigned short tmp; \
723 err |= __get_user(tmp, &sc->seg); \
724 regs->x##seg = tmp; }
726 #define COPY_SEG_STRICT(seg) \
727 { unsigned short tmp; \
728 err |= __get_user(tmp, &sc->seg); \
729 regs->x##seg = tmp|3; }
731 #define GET_SEG(seg) \
732 { unsigned short tmp; \
733 err |= __get_user(tmp, &sc->seg); \
734 loadsegment(seg,tmp); }
736 cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
737 cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
738 cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
739 cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
741 env->regs[R_EDI] = ldl(&sc->edi);
742 env->regs[R_ESI] = ldl(&sc->esi);
743 env->regs[R_EBP] = ldl(&sc->ebp);
744 env->regs[R_ESP] = ldl(&sc->esp);
745 env->regs[R_EBX] = ldl(&sc->ebx);
746 env->regs[R_EDX] = ldl(&sc->edx);
747 env->regs[R_ECX] = ldl(&sc->ecx);
748 env->eip = ldl(&sc->eip);
750 cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
751 cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
754 unsigned int tmpflags;
755 tmpflags = ldl(&sc->eflags);
756 env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
757 // regs->orig_eax = -1; /* disable syscall checks */
762 struct _fpstate * buf;
763 err |= __get_user(buf, &sc->fpstate);
765 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
767 err |= restore_i387(buf);
771 *peax = ldl(&sc->eax);
779 long do_sigreturn(CPUX86State *env)
781 struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
782 target_sigset_t target_set;
786 /* set blocked signals */
787 target_set.sig[0] = frame->sc.oldmask;
788 for(i = 1; i < TARGET_NSIG_WORDS; i++)
789 target_set.sig[i] = frame->extramask[i - 1];
791 target_to_host_sigset(&set, &target_set);
792 sigprocmask(SIG_SETMASK, &set, NULL);
794 /* restore registers */
795 if (restore_sigcontext(env, &frame->sc, &eax))
800 force_sig(TARGET_SIGSEGV);
804 long do_rt_sigreturn(CPUX86State *env)
806 struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4);
807 target_sigset_t target_set;
813 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
816 memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
818 target_to_host_sigset(&set, &target_set);
819 sigprocmask(SIG_SETMASK, &set, NULL);
821 if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
825 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
827 /* It is more difficult to avoid calling this function than to
828 call it and ignore errors. */
829 do_sigaltstack(&st, NULL, regs->esp);
834 force_sig(TARGET_SIGSEGV);
840 void process_pending_signals(void *cpu_env)
843 target_ulong handler;
844 sigset_t set, old_set;
845 target_sigset_t target_old_set;
846 struct emulated_sigaction *k;
853 for(sig = 1; sig <= TARGET_NSIG; sig++) {
858 /* if no signal is pending, just return */
864 fprintf(stderr, "gemu: process signal %d\n", sig);
872 handler = k->sa._sa_handler;
873 if (handler == TARGET_SIG_DFL) {
874 /* default handler : ignore some signal. The other are fatal */
875 if (sig != TARGET_SIGCHLD &&
876 sig != TARGET_SIGURG &&
877 sig != TARGET_SIGWINCH) {
880 } else if (handler == TARGET_SIG_IGN) {
882 } else if (handler == TARGET_SIG_ERR) {
885 /* compute the blocked signals during the handler execution */
886 target_to_host_sigset(&set, &k->sa.sa_mask);
887 /* SA_NODEFER indicates that the current signal should not be
888 blocked during the handler */
889 if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
890 sigaddset(&set, target_to_host_signal(sig));
892 /* block signals in the handler using Linux */
893 sigprocmask(SIG_BLOCK, &set, &old_set);
894 /* save the previous blocked signal state to restore it at the
895 end of the signal execution (see do_sigreturn) */
896 host_to_target_sigset(&target_old_set, &old_set);
898 /* prepare the stack frame of the virtual CPU */
899 if (k->sa.sa_flags & TARGET_SA_SIGINFO)
900 setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
902 setup_frame(sig, k, &target_old_set, cpu_env);
903 if (k->sa.sa_flags & TARGET_SA_RESETHAND)
904 k->sa._sa_handler = TARGET_SIG_DFL;