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 static uint8_t host_to_target_signal_table[65] = {
64 [SIGHUP] = TARGET_SIGHUP,
65 [SIGINT] = TARGET_SIGINT,
66 [SIGQUIT] = TARGET_SIGQUIT,
67 [SIGILL] = TARGET_SIGILL,
68 [SIGTRAP] = TARGET_SIGTRAP,
69 [SIGABRT] = TARGET_SIGABRT,
70 /* [SIGIOT] = TARGET_SIGIOT,*/
71 [SIGBUS] = TARGET_SIGBUS,
72 [SIGFPE] = TARGET_SIGFPE,
73 [SIGKILL] = TARGET_SIGKILL,
74 [SIGUSR1] = TARGET_SIGUSR1,
75 [SIGSEGV] = TARGET_SIGSEGV,
76 [SIGUSR2] = TARGET_SIGUSR2,
77 [SIGPIPE] = TARGET_SIGPIPE,
78 [SIGALRM] = TARGET_SIGALRM,
79 [SIGTERM] = TARGET_SIGTERM,
81 [SIGSTKFLT] = TARGET_SIGSTKFLT,
83 [SIGCHLD] = TARGET_SIGCHLD,
84 [SIGCONT] = TARGET_SIGCONT,
85 [SIGSTOP] = TARGET_SIGSTOP,
86 [SIGTSTP] = TARGET_SIGTSTP,
87 [SIGTTIN] = TARGET_SIGTTIN,
88 [SIGTTOU] = TARGET_SIGTTOU,
89 [SIGURG] = TARGET_SIGURG,
90 [SIGXCPU] = TARGET_SIGXCPU,
91 [SIGXFSZ] = TARGET_SIGXFSZ,
92 [SIGVTALRM] = TARGET_SIGVTALRM,
93 [SIGPROF] = TARGET_SIGPROF,
94 [SIGWINCH] = TARGET_SIGWINCH,
95 [SIGIO] = TARGET_SIGIO,
96 [SIGPWR] = TARGET_SIGPWR,
97 [SIGSYS] = TARGET_SIGSYS,
98 /* next signals stay the same */
100 static uint8_t target_to_host_signal_table[65];
102 static inline int host_to_target_signal(int sig)
104 return host_to_target_signal_table[sig];
107 static inline int target_to_host_signal(int sig)
109 return target_to_host_signal_table[sig];
112 void host_to_target_sigset(target_sigset_t *d, const sigset_t *s)
115 unsigned long sigmask;
116 uint32_t target_sigmask;
118 sigmask = ((unsigned long *)s)[0];
120 for(i = 0; i < 32; i++) {
121 if (sigmask & (1 << i))
122 target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1);
124 #if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
125 d->sig[0] = tswapl(target_sigmask);
126 for(i = 1;i < TARGET_NSIG_WORDS; i++) {
127 d->sig[i] = tswapl(((unsigned long *)s)[i]);
129 #elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
130 d->sig[0] = tswapl(target_sigmask);
131 d->sig[1] = tswapl(sigmask >> 32);
133 #error host_to_target_sigset
137 void target_to_host_sigset(sigset_t *d, const target_sigset_t *s)
140 unsigned long sigmask;
141 target_ulong target_sigmask;
143 target_sigmask = tswapl(s->sig[0]);
145 for(i = 0; i < 32; i++) {
146 if (target_sigmask & (1 << i))
147 sigmask |= 1 << (target_to_host_signal(i + 1) - 1);
149 #if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
150 ((unsigned long *)d)[0] = sigmask;
151 for(i = 1;i < TARGET_NSIG_WORDS; i++) {
152 ((unsigned long *)d)[i] = tswapl(s->sig[i]);
154 #elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
155 ((unsigned long *)d)[0] = sigmask | ((unsigned long)tswapl(s->sig[1]) << 32);
157 #error target_to_host_sigset
158 #endif /* TARGET_LONG_BITS */
161 void host_to_target_old_sigset(target_ulong *old_sigset,
162 const sigset_t *sigset)
165 host_to_target_sigset(&d, sigset);
166 *old_sigset = d.sig[0];
169 void target_to_host_old_sigset(sigset_t *sigset,
170 const target_ulong *old_sigset)
175 d.sig[0] = *old_sigset;
176 for(i = 1;i < TARGET_NSIG_WORDS; i++)
178 target_to_host_sigset(sigset, &d);
181 /* siginfo conversion */
183 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
184 const siginfo_t *info)
187 sig = host_to_target_signal(info->si_signo);
188 tinfo->si_signo = sig;
191 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
192 sig == SIGBUS || sig == SIGTRAP) {
193 /* should never come here, but who knows. The information for
194 the target is irrelevant */
195 tinfo->_sifields._sigfault._addr = 0;
196 } else if (sig >= TARGET_SIGRTMIN) {
197 tinfo->_sifields._rt._pid = info->si_pid;
198 tinfo->_sifields._rt._uid = info->si_uid;
199 /* XXX: potential problem if 64 bit */
200 tinfo->_sifields._rt._sigval.sival_ptr =
201 (target_ulong)info->si_value.sival_ptr;
205 static void tswap_siginfo(target_siginfo_t *tinfo,
206 const target_siginfo_t *info)
209 sig = info->si_signo;
210 tinfo->si_signo = tswap32(sig);
211 tinfo->si_errno = tswap32(info->si_errno);
212 tinfo->si_code = tswap32(info->si_code);
213 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
214 sig == SIGBUS || sig == SIGTRAP) {
215 tinfo->_sifields._sigfault._addr =
216 tswapl(info->_sifields._sigfault._addr);
217 } else if (sig >= TARGET_SIGRTMIN) {
218 tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
219 tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
220 tinfo->_sifields._rt._sigval.sival_ptr =
221 tswapl(info->_sifields._rt._sigval.sival_ptr);
226 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
228 host_to_target_siginfo_noswap(tinfo, info);
229 tswap_siginfo(tinfo, tinfo);
232 /* XXX: we support only POSIX RT signals are used. */
233 /* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
234 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
236 info->si_signo = tswap32(tinfo->si_signo);
237 info->si_errno = tswap32(tinfo->si_errno);
238 info->si_code = tswap32(tinfo->si_code);
239 info->si_pid = tswap32(tinfo->_sifields._rt._pid);
240 info->si_uid = tswap32(tinfo->_sifields._rt._uid);
241 info->si_value.sival_ptr =
242 (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
245 void signal_init(void)
247 struct sigaction act;
250 /* generate signal conversion tables */
251 for(i = 1; i <= 64; i++) {
252 if (host_to_target_signal_table[i] == 0)
253 host_to_target_signal_table[i] = i;
255 for(i = 1; i <= 64; i++) {
256 j = host_to_target_signal_table[i];
257 target_to_host_signal_table[j] = i;
260 /* set all host signal handlers. ALL signals are blocked during
261 the handlers to serialize them. */
262 sigfillset(&act.sa_mask);
263 act.sa_flags = SA_SIGINFO;
264 act.sa_sigaction = host_signal_handler;
265 for(i = 1; i < NSIG; i++) {
266 sigaction(i, &act, NULL);
269 memset(sigact_table, 0, sizeof(sigact_table));
271 first_free = &sigqueue_table[0];
272 for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
273 sigqueue_table[i].next = &sigqueue_table[i + 1];
274 sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
277 /* signal queue handling */
279 static inline struct sigqueue *alloc_sigqueue(void)
281 struct sigqueue *q = first_free;
284 first_free = q->next;
288 static inline void free_sigqueue(struct sigqueue *q)
290 q->next = first_free;
294 /* abort execution with signal */
295 void __attribute((noreturn)) force_sig(int sig)
298 host_sig = target_to_host_signal(sig);
299 fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
300 sig, strsignal(host_sig));
305 struct sigaction act;
306 sigemptyset(&act.sa_mask);
307 act.sa_flags = SA_SIGINFO;
308 act.sa_sigaction = SIG_DFL;
309 sigaction(SIGABRT, &act, NULL);
315 /* queue a signal so that it will be send to the virtual CPU as soon
317 int queue_signal(int sig, target_siginfo_t *info)
319 struct emulated_sigaction *k;
320 struct sigqueue *q, **pq;
321 target_ulong handler;
323 #if defined(DEBUG_SIGNAL)
324 fprintf(stderr, "queue_signal: sig=%d\n",
327 k = &sigact_table[sig - 1];
328 handler = k->sa._sa_handler;
329 if (handler == TARGET_SIG_DFL) {
330 /* default handler : ignore some signal. The other are fatal */
331 if (sig != TARGET_SIGCHLD &&
332 sig != TARGET_SIGURG &&
333 sig != TARGET_SIGWINCH) {
336 return 0; /* indicate ignored */
338 } else if (handler == TARGET_SIG_IGN) {
341 } else if (handler == TARGET_SIG_ERR) {
345 if (sig < TARGET_SIGRTMIN) {
346 /* if non real time signal, we queue exactly one signal */
356 q = alloc_sigqueue();
367 /* signal that a new signal is pending */
369 return 1; /* indicates that the signal was queued */
373 static void host_signal_handler(int host_signum, siginfo_t *info,
377 target_siginfo_t tinfo;
379 /* the CPU emulator uses some host signals to detect exceptions,
380 we we forward to it some signals */
381 if (host_signum == SIGSEGV || host_signum == SIGBUS
382 #if defined(TARGET_I386) && defined(USE_CODE_COPY)
383 || host_signum == SIGFPE
386 if (cpu_signal_handler(host_signum, info, puc))
390 /* get target signal number */
391 sig = host_to_target_signal(host_signum);
392 if (sig < 1 || sig > TARGET_NSIG)
394 #if defined(DEBUG_SIGNAL)
395 fprintf(stderr, "qemu: got signal %d\n", sig);
397 host_to_target_siginfo_noswap(&tinfo, info);
398 if (queue_signal(sig, &tinfo) == 1) {
399 /* interrupt the virtual CPU as soon as possible */
400 cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
404 int do_sigaction(int sig, const struct target_sigaction *act,
405 struct target_sigaction *oact)
407 struct emulated_sigaction *k;
408 struct sigaction act1;
411 if (sig < 1 || sig > TARGET_NSIG)
413 k = &sigact_table[sig - 1];
414 #if defined(DEBUG_SIGNAL)
415 fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
416 sig, (int)act, (int)oact);
419 oact->_sa_handler = tswapl(k->sa._sa_handler);
420 oact->sa_flags = tswapl(k->sa.sa_flags);
421 oact->sa_restorer = tswapl(k->sa.sa_restorer);
422 oact->sa_mask = k->sa.sa_mask;
425 k->sa._sa_handler = tswapl(act->_sa_handler);
426 k->sa.sa_flags = tswapl(act->sa_flags);
427 k->sa.sa_restorer = tswapl(act->sa_restorer);
428 k->sa.sa_mask = act->sa_mask;
430 /* we update the host linux signal state */
431 host_sig = target_to_host_signal(sig);
432 if (host_sig != SIGSEGV && host_sig != SIGBUS) {
433 sigfillset(&act1.sa_mask);
434 act1.sa_flags = SA_SIGINFO;
435 if (k->sa.sa_flags & TARGET_SA_RESTART)
436 act1.sa_flags |= SA_RESTART;
437 /* NOTE: it is important to update the host kernel signal
438 ignore state to avoid getting unexpected interrupted
440 if (k->sa._sa_handler == TARGET_SIG_IGN) {
441 act1.sa_sigaction = (void *)SIG_IGN;
442 } else if (k->sa._sa_handler == TARGET_SIG_DFL) {
443 act1.sa_sigaction = (void *)SIG_DFL;
445 act1.sa_sigaction = host_signal_handler;
447 sigaction(host_sig, &act1, NULL);
454 #define offsetof(type, field) ((size_t) &((type *)0)->field)
457 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
458 const target_siginfo_t *info)
460 tswap_siginfo(tinfo, info);
466 /* from the Linux kernel */
468 struct target_fpreg {
469 uint16_t significand[4];
473 struct target_fpxreg {
474 uint16_t significand[4];
479 struct target_xmmreg {
480 target_ulong element[4];
483 struct target_fpstate {
484 /* Regular FPU environment */
490 target_ulong dataoff;
491 target_ulong datasel;
492 struct target_fpreg _st[8];
494 uint16_t magic; /* 0xffff = regular FPU data only */
496 /* FXSR FPU environment */
497 target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
499 target_ulong reserved;
500 struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
501 struct target_xmmreg _xmm[8];
502 target_ulong padding[56];
505 #define X86_FXSR_MAGIC 0x0000
507 struct target_sigcontext {
525 target_ulong esp_at_signal;
527 target_ulong fpstate; /* pointer */
528 target_ulong oldmask;
532 typedef struct target_sigaltstack {
535 target_ulong ss_size;
538 struct target_ucontext {
539 target_ulong uc_flags;
540 target_ulong uc_link;
541 target_stack_t uc_stack;
542 struct target_sigcontext uc_mcontext;
543 target_sigset_t uc_sigmask; /* mask last for extensibility */
548 target_ulong pretcode;
550 struct target_sigcontext sc;
551 struct target_fpstate fpstate;
552 target_ulong extramask[TARGET_NSIG_WORDS-1];
558 target_ulong pretcode;
562 struct target_siginfo info;
563 struct target_ucontext uc;
564 struct target_fpstate fpstate;
569 * Set up a signal frame.
572 /* XXX: save x87 state */
574 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
575 CPUX86State *env, unsigned long mask)
579 err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
580 err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
581 err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
582 err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
583 err |= __put_user(env->regs[R_EDI], &sc->edi);
584 err |= __put_user(env->regs[R_ESI], &sc->esi);
585 err |= __put_user(env->regs[R_EBP], &sc->ebp);
586 err |= __put_user(env->regs[R_ESP], &sc->esp);
587 err |= __put_user(env->regs[R_EBX], &sc->ebx);
588 err |= __put_user(env->regs[R_EDX], &sc->edx);
589 err |= __put_user(env->regs[R_ECX], &sc->ecx);
590 err |= __put_user(env->regs[R_EAX], &sc->eax);
591 err |= __put_user(env->exception_index, &sc->trapno);
592 err |= __put_user(env->error_code, &sc->err);
593 err |= __put_user(env->eip, &sc->eip);
594 err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
595 err |= __put_user(env->eflags, &sc->eflags);
596 err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
597 err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
599 cpu_x86_fsave(env, (void *)fpstate, 1);
600 fpstate->status = fpstate->sw;
601 err |= __put_user(0xffff, &fpstate->magic);
602 err |= __put_user(fpstate, &sc->fpstate);
604 /* non-iBCS2 extensions.. */
605 err |= __put_user(mask, &sc->oldmask);
606 err |= __put_user(env->cr[2], &sc->cr2);
611 * Determine which stack to use..
615 get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
619 /* Default to using normal stack */
620 esp = env->regs[R_ESP];
622 /* This is the X/Open sanctioned signal stack switching. */
623 if (ka->sa.sa_flags & SA_ONSTACK) {
624 if (sas_ss_flags(esp) == 0)
625 esp = current->sas_ss_sp + current->sas_ss_size;
628 /* This is the legacy signal stack switching. */
631 if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
632 !(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
633 ka->sa.sa_restorer) {
634 esp = (unsigned long) ka->sa.sa_restorer;
636 return (void *)((esp - frame_size) & -8ul);
639 static void setup_frame(int sig, struct emulated_sigaction *ka,
640 target_sigset_t *set, CPUX86State *env)
642 struct sigframe *frame;
645 frame = get_sigframe(ka, env, sizeof(*frame));
647 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
649 err |= __put_user((/*current->exec_domain
650 && current->exec_domain->signal_invmap
652 ? current->exec_domain->signal_invmap[sig]
658 setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
662 if (TARGET_NSIG_WORDS > 1) {
663 err |= __copy_to_user(frame->extramask, &set->sig[1],
664 sizeof(frame->extramask));
669 /* Set up to return from userspace. If provided, use a stub
670 already in userspace. */
671 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
672 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
674 err |= __put_user(frame->retcode, &frame->pretcode);
675 /* This is popl %eax ; movl $,%eax ; int $0x80 */
676 err |= __put_user(0xb858, (short *)(frame->retcode+0));
677 err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
678 err |= __put_user(0x80cd, (short *)(frame->retcode+6));
684 /* Set up registers for signal handler */
685 env->regs[R_ESP] = (unsigned long) frame;
686 env->eip = (unsigned long) ka->sa._sa_handler;
688 cpu_x86_load_seg(env, R_DS, __USER_DS);
689 cpu_x86_load_seg(env, R_ES, __USER_DS);
690 cpu_x86_load_seg(env, R_SS, __USER_DS);
691 cpu_x86_load_seg(env, R_CS, __USER_CS);
692 env->eflags &= ~TF_MASK;
697 if (sig == TARGET_SIGSEGV)
698 ka->sa._sa_handler = TARGET_SIG_DFL;
699 force_sig(TARGET_SIGSEGV /* , current */);
702 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
703 target_siginfo_t *info,
704 target_sigset_t *set, CPUX86State *env)
706 struct rt_sigframe *frame;
709 frame = get_sigframe(ka, env, sizeof(*frame));
711 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
714 err |= __put_user((/*current->exec_domain
715 && current->exec_domain->signal_invmap
717 ? current->exec_domain->signal_invmap[sig]
720 err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
721 err |= __put_user((target_ulong)&frame->uc, &frame->puc);
722 err |= copy_siginfo_to_user(&frame->info, info);
726 /* Create the ucontext. */
727 err |= __put_user(0, &frame->uc.uc_flags);
728 err |= __put_user(0, &frame->uc.uc_link);
729 err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
730 err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
731 &frame->uc.uc_stack.ss_flags);
732 err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
733 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
735 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
739 /* Set up to return from userspace. If provided, use a stub
740 already in userspace. */
741 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
742 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
744 err |= __put_user(frame->retcode, &frame->pretcode);
745 /* This is movl $,%eax ; int $0x80 */
746 err |= __put_user(0xb8, (char *)(frame->retcode+0));
747 err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
748 err |= __put_user(0x80cd, (short *)(frame->retcode+5));
754 /* Set up registers for signal handler */
755 env->regs[R_ESP] = (unsigned long) frame;
756 env->eip = (unsigned long) ka->sa._sa_handler;
758 cpu_x86_load_seg(env, R_DS, __USER_DS);
759 cpu_x86_load_seg(env, R_ES, __USER_DS);
760 cpu_x86_load_seg(env, R_SS, __USER_DS);
761 cpu_x86_load_seg(env, R_CS, __USER_CS);
762 env->eflags &= ~TF_MASK;
767 if (sig == TARGET_SIGSEGV)
768 ka->sa._sa_handler = TARGET_SIG_DFL;
769 force_sig(TARGET_SIGSEGV /* , current */);
773 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
775 unsigned int err = 0;
777 cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
778 cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
779 cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
780 cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
782 env->regs[R_EDI] = ldl(&sc->edi);
783 env->regs[R_ESI] = ldl(&sc->esi);
784 env->regs[R_EBP] = ldl(&sc->ebp);
785 env->regs[R_ESP] = ldl(&sc->esp);
786 env->regs[R_EBX] = ldl(&sc->ebx);
787 env->regs[R_EDX] = ldl(&sc->edx);
788 env->regs[R_ECX] = ldl(&sc->ecx);
789 env->eip = ldl(&sc->eip);
791 cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
792 cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
795 unsigned int tmpflags;
796 tmpflags = ldl(&sc->eflags);
797 env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
798 // regs->orig_eax = -1; /* disable syscall checks */
802 struct _fpstate * buf;
803 buf = (void *)ldl(&sc->fpstate);
806 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
809 cpu_x86_frstor(env, (void *)buf, 1);
813 *peax = ldl(&sc->eax);
821 long do_sigreturn(CPUX86State *env)
823 struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
824 target_sigset_t target_set;
828 #if defined(DEBUG_SIGNAL)
829 fprintf(stderr, "do_sigreturn\n");
831 /* set blocked signals */
832 target_set.sig[0] = frame->sc.oldmask;
833 for(i = 1; i < TARGET_NSIG_WORDS; i++)
834 target_set.sig[i] = frame->extramask[i - 1];
836 target_to_host_sigset(&set, &target_set);
837 sigprocmask(SIG_SETMASK, &set, NULL);
839 /* restore registers */
840 if (restore_sigcontext(env, &frame->sc, &eax))
845 force_sig(TARGET_SIGSEGV);
849 long do_rt_sigreturn(CPUX86State *env)
851 struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4);
852 target_sigset_t target_set;
858 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
861 memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
863 target_to_host_sigset(&set, &target_set);
864 sigprocmask(SIG_SETMASK, &set, NULL);
866 if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
870 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
872 /* It is more difficult to avoid calling this function than to
873 call it and ignore errors. */
874 do_sigaltstack(&st, NULL, regs->esp);
879 force_sig(TARGET_SIGSEGV);
883 #elif defined(TARGET_ARM)
885 struct target_sigcontext {
886 target_ulong trap_no;
887 target_ulong error_code;
888 target_ulong oldmask;
899 target_ulong arm_r10;
905 target_ulong arm_cpsr;
906 target_ulong fault_address;
909 typedef struct target_sigaltstack {
912 target_ulong ss_size;
915 struct target_ucontext {
916 target_ulong uc_flags;
917 target_ulong uc_link;
918 target_stack_t uc_stack;
919 struct target_sigcontext uc_mcontext;
920 target_sigset_t uc_sigmask; /* mask last for extensibility */
925 struct target_sigcontext sc;
926 target_ulong extramask[TARGET_NSIG_WORDS-1];
927 target_ulong retcode;
932 struct target_siginfo *pinfo;
934 struct target_siginfo info;
935 struct target_ucontext uc;
936 target_ulong retcode;
939 #define TARGET_CONFIG_CPU_32 1
942 * For ARM syscalls, we encode the syscall number into the instruction.
944 #define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
945 #define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
948 * For Thumb syscalls, we pass the syscall number via r7. We therefore
949 * need two 16-bit instructions.
951 #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
952 #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
954 static const target_ulong retcodes[4] = {
955 SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
956 SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
960 #define __put_user_error(x,p,e) __put_user(x, p)
961 #define __get_user_error(x,p,e) __get_user(x, p)
963 static inline int valid_user_regs(CPUState *regs)
969 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
970 CPUState *env, unsigned long mask)
974 __put_user_error(env->regs[0], &sc->arm_r0, err);
975 __put_user_error(env->regs[1], &sc->arm_r1, err);
976 __put_user_error(env->regs[2], &sc->arm_r2, err);
977 __put_user_error(env->regs[3], &sc->arm_r3, err);
978 __put_user_error(env->regs[4], &sc->arm_r4, err);
979 __put_user_error(env->regs[5], &sc->arm_r5, err);
980 __put_user_error(env->regs[6], &sc->arm_r6, err);
981 __put_user_error(env->regs[7], &sc->arm_r7, err);
982 __put_user_error(env->regs[8], &sc->arm_r8, err);
983 __put_user_error(env->regs[9], &sc->arm_r9, err);
984 __put_user_error(env->regs[10], &sc->arm_r10, err);
985 __put_user_error(env->regs[11], &sc->arm_fp, err);
986 __put_user_error(env->regs[12], &sc->arm_ip, err);
987 __put_user_error(env->regs[13], &sc->arm_sp, err);
988 __put_user_error(env->regs[14], &sc->arm_lr, err);
989 __put_user_error(env->regs[15], &sc->arm_pc, err);
990 #ifdef TARGET_CONFIG_CPU_32
991 __put_user_error(env->cpsr, &sc->arm_cpsr, err);
994 __put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err);
995 __put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err);
996 __put_user_error(/* current->thread.address */ 0, &sc->fault_address, err);
997 __put_user_error(mask, &sc->oldmask, err);
1002 static inline void *
1003 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
1005 unsigned long sp = regs->regs[13];
1009 * This is the X/Open sanctioned signal stack switching.
1011 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
1012 sp = current->sas_ss_sp + current->sas_ss_size;
1015 * ATPCS B01 mandates 8-byte alignment
1017 return (void *)((sp - framesize) & ~7);
1021 setup_return(CPUState *env, struct emulated_sigaction *ka,
1022 target_ulong *rc, void *frame, int usig)
1024 target_ulong handler = (target_ulong)ka->sa._sa_handler;
1025 target_ulong retcode;
1027 #if defined(TARGET_CONFIG_CPU_32)
1028 target_ulong cpsr = env->cpsr;
1032 * Maybe we need to deliver a 32-bit signal to a 26-bit task.
1034 if (ka->sa.sa_flags & SA_THIRTYTWO)
1035 cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
1037 #ifdef CONFIG_ARM_THUMB
1038 if (elf_hwcap & HWCAP_THUMB) {
1040 * The LSB of the handler determines if we're going to
1041 * be using THUMB or ARM mode for this signal handler.
1043 thumb = handler & 1;
1052 #endif /* TARGET_CONFIG_CPU_32 */
1054 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
1055 retcode = (target_ulong)ka->sa.sa_restorer;
1057 unsigned int idx = thumb;
1059 if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
1062 if (__put_user(retcodes[idx], rc))
1065 flush_icache_range((target_ulong)rc,
1066 (target_ulong)(rc + 1));
1068 retcode = ((target_ulong)rc) + thumb;
1071 env->regs[0] = usig;
1072 env->regs[13] = (target_ulong)frame;
1073 env->regs[14] = retcode;
1074 env->regs[15] = handler & (thumb ? ~1 : ~3);
1076 #ifdef TARGET_CONFIG_CPU_32
1083 static void setup_frame(int usig, struct emulated_sigaction *ka,
1084 target_sigset_t *set, CPUState *regs)
1086 struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
1089 err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
1091 if (TARGET_NSIG_WORDS > 1) {
1092 err |= __copy_to_user(frame->extramask, &set->sig[1],
1093 sizeof(frame->extramask));
1097 err = setup_return(regs, ka, &frame->retcode, frame, usig);
1101 static void setup_rt_frame(int usig, struct emulated_sigaction *ka,
1102 target_siginfo_t *info,
1103 target_sigset_t *set, CPUState *env)
1105 struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame));
1108 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
1111 __put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err);
1112 __put_user_error(&frame->uc, (target_ulong *)&frame->puc, err);
1113 err |= copy_siginfo_to_user(&frame->info, info);
1115 /* Clear all the bits of the ucontext we don't use. */
1116 err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
1118 err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
1120 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
1123 err = setup_return(env, ka, &frame->retcode, frame, usig);
1127 * For realtime signals we must also set the second and third
1128 * arguments for the signal handler.
1129 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
1131 env->regs[1] = (target_ulong)frame->pinfo;
1132 env->regs[2] = (target_ulong)frame->puc;
1139 restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
1143 __get_user_error(env->regs[0], &sc->arm_r0, err);
1144 __get_user_error(env->regs[1], &sc->arm_r1, err);
1145 __get_user_error(env->regs[2], &sc->arm_r2, err);
1146 __get_user_error(env->regs[3], &sc->arm_r3, err);
1147 __get_user_error(env->regs[4], &sc->arm_r4, err);
1148 __get_user_error(env->regs[5], &sc->arm_r5, err);
1149 __get_user_error(env->regs[6], &sc->arm_r6, err);
1150 __get_user_error(env->regs[7], &sc->arm_r7, err);
1151 __get_user_error(env->regs[8], &sc->arm_r8, err);
1152 __get_user_error(env->regs[9], &sc->arm_r9, err);
1153 __get_user_error(env->regs[10], &sc->arm_r10, err);
1154 __get_user_error(env->regs[11], &sc->arm_fp, err);
1155 __get_user_error(env->regs[12], &sc->arm_ip, err);
1156 __get_user_error(env->regs[13], &sc->arm_sp, err);
1157 __get_user_error(env->regs[14], &sc->arm_lr, err);
1158 __get_user_error(env->regs[15], &sc->arm_pc, err);
1159 #ifdef TARGET_CONFIG_CPU_32
1160 __get_user_error(env->cpsr, &sc->arm_cpsr, err);
1163 err |= !valid_user_regs(env);
1168 long do_sigreturn(CPUState *env)
1170 struct sigframe *frame;
1171 target_sigset_t set;
1175 * Since we stacked the signal on a 64-bit boundary,
1176 * then 'sp' should be word aligned here. If it's
1177 * not, then the user is trying to mess with us.
1179 if (env->regs[13] & 7)
1182 frame = (struct sigframe *)env->regs[13];
1185 if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1188 if (__get_user(set.sig[0], &frame->sc.oldmask)
1189 || (TARGET_NSIG_WORDS > 1
1190 && __copy_from_user(&set.sig[1], &frame->extramask,
1191 sizeof(frame->extramask))))
1194 target_to_host_sigset(&host_set, &set);
1195 sigprocmask(SIG_SETMASK, &host_set, NULL);
1197 if (restore_sigcontext(env, &frame->sc))
1201 /* Send SIGTRAP if we're single-stepping */
1202 if (ptrace_cancel_bpt(current))
1203 send_sig(SIGTRAP, current, 1);
1205 return env->regs[0];
1208 force_sig(SIGSEGV /* , current */);
1212 long do_rt_sigreturn(CPUState *env)
1214 struct rt_sigframe *frame;
1215 target_sigset_t set;
1219 * Since we stacked the signal on a 64-bit boundary,
1220 * then 'sp' should be word aligned here. If it's
1221 * not, then the user is trying to mess with us.
1223 if (env->regs[13] & 7)
1226 frame = (struct rt_sigframe *)env->regs[13];
1229 if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1232 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
1235 target_to_host_sigset(&host_set, &set);
1236 sigprocmask(SIG_SETMASK, &host_set, NULL);
1238 if (restore_sigcontext(env, &frame->uc.uc_mcontext))
1242 /* Send SIGTRAP if we're single-stepping */
1243 if (ptrace_cancel_bpt(current))
1244 send_sig(SIGTRAP, current, 1);
1246 return env->regs[0];
1249 force_sig(SIGSEGV /* , current */);
1255 static void setup_frame(int sig, struct emulated_sigaction *ka,
1256 target_sigset_t *set, CPUState *env)
1258 fprintf(stderr, "setup_frame: not implemented\n");
1261 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1262 target_siginfo_t *info,
1263 target_sigset_t *set, CPUState *env)
1265 fprintf(stderr, "setup_rt_frame: not implemented\n");
1268 long do_sigreturn(CPUState *env)
1270 fprintf(stderr, "do_sigreturn: not implemented\n");
1274 long do_rt_sigreturn(CPUState *env)
1276 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1282 void process_pending_signals(void *cpu_env)
1285 target_ulong handler;
1286 sigset_t set, old_set;
1287 target_sigset_t target_old_set;
1288 struct emulated_sigaction *k;
1291 if (!signal_pending)
1295 for(sig = 1; sig <= TARGET_NSIG; sig++) {
1300 /* if no signal is pending, just return */
1306 fprintf(stderr, "qemu: process signal %d\n", sig);
1308 /* dequeue signal */
1314 handler = k->sa._sa_handler;
1315 if (handler == TARGET_SIG_DFL) {
1316 /* default handler : ignore some signal. The other are fatal */
1317 if (sig != TARGET_SIGCHLD &&
1318 sig != TARGET_SIGURG &&
1319 sig != TARGET_SIGWINCH) {
1322 } else if (handler == TARGET_SIG_IGN) {
1324 } else if (handler == TARGET_SIG_ERR) {
1327 /* compute the blocked signals during the handler execution */
1328 target_to_host_sigset(&set, &k->sa.sa_mask);
1329 /* SA_NODEFER indicates that the current signal should not be
1330 blocked during the handler */
1331 if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
1332 sigaddset(&set, target_to_host_signal(sig));
1334 /* block signals in the handler using Linux */
1335 sigprocmask(SIG_BLOCK, &set, &old_set);
1336 /* save the previous blocked signal state to restore it at the
1337 end of the signal execution (see do_sigreturn) */
1338 host_to_target_sigset(&target_old_set, &old_set);
1340 /* if the CPU is in VM86 mode, we restore the 32 bit values */
1343 CPUX86State *env = cpu_env;
1344 if (env->eflags & VM_MASK)
1345 save_v86_state(env);
1348 /* prepare the stack frame of the virtual CPU */
1349 if (k->sa.sa_flags & TARGET_SA_SIGINFO)
1350 setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
1352 setup_frame(sig, k, &target_old_set, cpu_env);
1353 if (k->sa.sa_flags & TARGET_SA_RESETHAND)
1354 k->sa._sa_handler = TARGET_SIG_DFL;