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>
29 #include "target_signal.h"
32 //#define DEBUG_SIGNAL
34 #define MAX_SIGQUEUE_SIZE 1024
37 struct sigqueue *next;
38 target_siginfo_t info;
41 struct emulated_sigaction {
42 struct target_sigaction sa;
43 int pending; /* true if signal is pending */
44 struct sigqueue *first;
45 struct sigqueue info; /* in order to always have memory for the
46 first signal, we put it here */
49 struct target_sigaltstack target_sigaltstack_used = {
52 .ss_flags = TARGET_SS_DISABLE,
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 on_sig_stack(unsigned long sp)
104 return (sp - target_sigaltstack_used.ss_sp
105 < target_sigaltstack_used.ss_size);
108 static inline int sas_ss_flags(unsigned long sp)
110 return (target_sigaltstack_used.ss_size == 0 ? SS_DISABLE
111 : on_sig_stack(sp) ? SS_ONSTACK : 0);
114 static inline int host_to_target_signal(int sig)
116 return host_to_target_signal_table[sig];
119 static inline int target_to_host_signal(int sig)
121 return target_to_host_signal_table[sig];
124 static void host_to_target_sigset_internal(target_sigset_t *d,
128 unsigned long sigmask;
129 uint32_t target_sigmask;
131 sigmask = ((unsigned long *)s)[0];
133 for(i = 0; i < 32; i++) {
134 if (sigmask & (1 << i))
135 target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1);
137 #if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
138 d->sig[0] = target_sigmask;
139 for(i = 1;i < TARGET_NSIG_WORDS; i++) {
140 d->sig[i] = ((unsigned long *)s)[i];
142 #elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
143 d->sig[0] = target_sigmask;
144 d->sig[1] = sigmask >> 32;
146 #warning host_to_target_sigset
150 void host_to_target_sigset(target_sigset_t *d, const sigset_t *s)
155 host_to_target_sigset_internal(&d1, s);
156 for(i = 0;i < TARGET_NSIG_WORDS; i++)
157 d->sig[i] = tswapl(d1.sig[i]);
160 void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s)
163 unsigned long sigmask;
164 target_ulong target_sigmask;
166 target_sigmask = s->sig[0];
168 for(i = 0; i < 32; i++) {
169 if (target_sigmask & (1 << i))
170 sigmask |= 1 << (target_to_host_signal(i + 1) - 1);
172 #if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
173 ((unsigned long *)d)[0] = sigmask;
174 for(i = 1;i < TARGET_NSIG_WORDS; i++) {
175 ((unsigned long *)d)[i] = s->sig[i];
177 #elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
178 ((unsigned long *)d)[0] = sigmask | ((unsigned long)(s->sig[1]) << 32);
180 #warning target_to_host_sigset
181 #endif /* TARGET_LONG_BITS */
184 void target_to_host_sigset(sigset_t *d, const target_sigset_t *s)
189 for(i = 0;i < TARGET_NSIG_WORDS; i++)
190 s1.sig[i] = tswapl(s->sig[i]);
191 target_to_host_sigset_internal(d, &s1);
194 void host_to_target_old_sigset(target_ulong *old_sigset,
195 const sigset_t *sigset)
198 host_to_target_sigset(&d, sigset);
199 *old_sigset = d.sig[0];
202 void target_to_host_old_sigset(sigset_t *sigset,
203 const target_ulong *old_sigset)
208 d.sig[0] = *old_sigset;
209 for(i = 1;i < TARGET_NSIG_WORDS; i++)
211 target_to_host_sigset(sigset, &d);
214 /* siginfo conversion */
216 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
217 const siginfo_t *info)
220 sig = host_to_target_signal(info->si_signo);
221 tinfo->si_signo = sig;
224 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
225 sig == SIGBUS || sig == SIGTRAP) {
226 /* should never come here, but who knows. The information for
227 the target is irrelevant */
228 tinfo->_sifields._sigfault._addr = 0;
229 } else if (sig == SIGIO) {
230 tinfo->_sifields._sigpoll._fd = info->si_fd;
231 } else if (sig >= TARGET_SIGRTMIN) {
232 tinfo->_sifields._rt._pid = info->si_pid;
233 tinfo->_sifields._rt._uid = info->si_uid;
234 /* XXX: potential problem if 64 bit */
235 tinfo->_sifields._rt._sigval.sival_ptr =
236 (target_ulong)info->si_value.sival_ptr;
240 static void tswap_siginfo(target_siginfo_t *tinfo,
241 const target_siginfo_t *info)
244 sig = info->si_signo;
245 tinfo->si_signo = tswap32(sig);
246 tinfo->si_errno = tswap32(info->si_errno);
247 tinfo->si_code = tswap32(info->si_code);
248 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
249 sig == SIGBUS || sig == SIGTRAP) {
250 tinfo->_sifields._sigfault._addr =
251 tswapl(info->_sifields._sigfault._addr);
252 } else if (sig == SIGIO) {
253 tinfo->_sifields._sigpoll._fd = tswap32(info->_sifields._sigpoll._fd);
254 } else if (sig >= TARGET_SIGRTMIN) {
255 tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
256 tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
257 tinfo->_sifields._rt._sigval.sival_ptr =
258 tswapl(info->_sifields._rt._sigval.sival_ptr);
263 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
265 host_to_target_siginfo_noswap(tinfo, info);
266 tswap_siginfo(tinfo, tinfo);
269 /* XXX: we support only POSIX RT signals are used. */
270 /* XXX: find a solution for 64 bit (additional malloced data is needed) */
271 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
273 info->si_signo = tswap32(tinfo->si_signo);
274 info->si_errno = tswap32(tinfo->si_errno);
275 info->si_code = tswap32(tinfo->si_code);
276 info->si_pid = tswap32(tinfo->_sifields._rt._pid);
277 info->si_uid = tswap32(tinfo->_sifields._rt._uid);
278 info->si_value.sival_ptr =
279 (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
282 void signal_init(void)
284 struct sigaction act;
287 /* generate signal conversion tables */
288 for(i = 1; i <= 64; i++) {
289 if (host_to_target_signal_table[i] == 0)
290 host_to_target_signal_table[i] = i;
292 for(i = 1; i <= 64; i++) {
293 j = host_to_target_signal_table[i];
294 target_to_host_signal_table[j] = i;
297 /* set all host signal handlers. ALL signals are blocked during
298 the handlers to serialize them. */
299 sigfillset(&act.sa_mask);
300 act.sa_flags = SA_SIGINFO;
301 act.sa_sigaction = host_signal_handler;
302 for(i = 1; i < NSIG; i++) {
303 sigaction(i, &act, NULL);
306 memset(sigact_table, 0, sizeof(sigact_table));
308 first_free = &sigqueue_table[0];
309 for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
310 sigqueue_table[i].next = &sigqueue_table[i + 1];
311 sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
314 /* signal queue handling */
316 static inline struct sigqueue *alloc_sigqueue(void)
318 struct sigqueue *q = first_free;
321 first_free = q->next;
325 static inline void free_sigqueue(struct sigqueue *q)
327 q->next = first_free;
331 /* abort execution with signal */
332 void __attribute((noreturn)) force_sig(int sig)
335 host_sig = target_to_host_signal(sig);
336 fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
337 sig, strsignal(host_sig));
342 struct sigaction act;
343 sigemptyset(&act.sa_mask);
344 act.sa_flags = SA_SIGINFO;
345 act.sa_sigaction = SIG_DFL;
346 sigaction(SIGABRT, &act, NULL);
352 /* queue a signal so that it will be send to the virtual CPU as soon
354 int queue_signal(int sig, target_siginfo_t *info)
356 struct emulated_sigaction *k;
357 struct sigqueue *q, **pq;
358 target_ulong handler;
360 #if defined(DEBUG_SIGNAL)
361 fprintf(stderr, "queue_signal: sig=%d\n",
364 k = &sigact_table[sig - 1];
365 handler = k->sa._sa_handler;
366 if (handler == TARGET_SIG_DFL) {
367 /* default handler : ignore some signal. The other are fatal */
368 if (sig != TARGET_SIGCHLD &&
369 sig != TARGET_SIGURG &&
370 sig != TARGET_SIGWINCH) {
373 return 0; /* indicate ignored */
375 } else if (handler == TARGET_SIG_IGN) {
378 } else if (handler == TARGET_SIG_ERR) {
382 if (sig < TARGET_SIGRTMIN) {
383 /* if non real time signal, we queue exactly one signal */
393 q = alloc_sigqueue();
404 /* signal that a new signal is pending */
406 return 1; /* indicates that the signal was queued */
410 static void host_signal_handler(int host_signum, siginfo_t *info,
414 target_siginfo_t tinfo;
416 /* the CPU emulator uses some host signals to detect exceptions,
417 we we forward to it some signals */
418 if (host_signum == SIGSEGV || host_signum == SIGBUS
419 #if defined(TARGET_I386) && defined(USE_CODE_COPY)
420 || host_signum == SIGFPE
423 if (cpu_signal_handler(host_signum, info, puc))
427 /* get target signal number */
428 sig = host_to_target_signal(host_signum);
429 if (sig < 1 || sig > TARGET_NSIG)
431 #if defined(DEBUG_SIGNAL)
432 fprintf(stderr, "qemu: got signal %d\n", sig);
434 host_to_target_siginfo_noswap(&tinfo, info);
435 if (queue_signal(sig, &tinfo) == 1) {
436 /* interrupt the virtual CPU as soon as possible */
437 cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
441 int do_sigaltstack(const struct target_sigaltstack *uss,
442 struct target_sigaltstack *uoss,
446 struct target_sigaltstack oss;
448 /* XXX: test errors */
451 __put_user(target_sigaltstack_used.ss_sp, &oss.ss_sp);
452 __put_user(target_sigaltstack_used.ss_size, &oss.ss_size);
453 __put_user(sas_ss_flags(sp), &oss.ss_flags);
458 struct target_sigaltstack ss;
461 if (!access_ok(VERIFY_READ, uss, sizeof(*uss))
462 || __get_user(ss.ss_sp, &uss->ss_sp)
463 || __get_user(ss.ss_size, &uss->ss_size)
464 || __get_user(ss.ss_flags, &uss->ss_flags))
468 if (on_sig_stack(sp))
472 if (ss.ss_flags != TARGET_SS_DISABLE
473 && ss.ss_flags != TARGET_SS_ONSTACK
477 if (ss.ss_flags == TARGET_SS_DISABLE) {
482 if (ss.ss_size < MINSIGSTKSZ)
486 target_sigaltstack_used.ss_sp = ss.ss_sp;
487 target_sigaltstack_used.ss_size = ss.ss_size;
492 if (!access_ok(VERIFY_WRITE, uoss, sizeof(oss)))
494 memcpy(uoss, &oss, sizeof(oss));
502 int do_sigaction(int sig, const struct target_sigaction *act,
503 struct target_sigaction *oact)
505 struct emulated_sigaction *k;
506 struct sigaction act1;
509 if (sig < 1 || sig > TARGET_NSIG || sig == SIGKILL || sig == SIGSTOP)
511 k = &sigact_table[sig - 1];
512 #if defined(DEBUG_SIGNAL)
513 fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
514 sig, (int)act, (int)oact);
517 oact->_sa_handler = tswapl(k->sa._sa_handler);
518 oact->sa_flags = tswapl(k->sa.sa_flags);
519 #if !defined(TARGET_MIPS)
520 oact->sa_restorer = tswapl(k->sa.sa_restorer);
522 oact->sa_mask = k->sa.sa_mask;
525 k->sa._sa_handler = tswapl(act->_sa_handler);
526 k->sa.sa_flags = tswapl(act->sa_flags);
527 #if !defined(TARGET_MIPS)
528 k->sa.sa_restorer = tswapl(act->sa_restorer);
530 k->sa.sa_mask = act->sa_mask;
532 /* we update the host linux signal state */
533 host_sig = target_to_host_signal(sig);
534 if (host_sig != SIGSEGV && host_sig != SIGBUS) {
535 sigfillset(&act1.sa_mask);
536 act1.sa_flags = SA_SIGINFO;
537 if (k->sa.sa_flags & TARGET_SA_RESTART)
538 act1.sa_flags |= SA_RESTART;
539 /* NOTE: it is important to update the host kernel signal
540 ignore state to avoid getting unexpected interrupted
542 if (k->sa._sa_handler == TARGET_SIG_IGN) {
543 act1.sa_sigaction = (void *)SIG_IGN;
544 } else if (k->sa._sa_handler == TARGET_SIG_DFL) {
545 act1.sa_sigaction = (void *)SIG_DFL;
547 act1.sa_sigaction = host_signal_handler;
549 sigaction(host_sig, &act1, NULL);
556 #define offsetof(type, field) ((size_t) &((type *)0)->field)
559 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
560 const target_siginfo_t *info)
562 tswap_siginfo(tinfo, info);
568 /* from the Linux kernel */
570 struct target_fpreg {
571 uint16_t significand[4];
575 struct target_fpxreg {
576 uint16_t significand[4];
581 struct target_xmmreg {
582 target_ulong element[4];
585 struct target_fpstate {
586 /* Regular FPU environment */
592 target_ulong dataoff;
593 target_ulong datasel;
594 struct target_fpreg _st[8];
596 uint16_t magic; /* 0xffff = regular FPU data only */
598 /* FXSR FPU environment */
599 target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
601 target_ulong reserved;
602 struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
603 struct target_xmmreg _xmm[8];
604 target_ulong padding[56];
607 #define X86_FXSR_MAGIC 0x0000
609 struct target_sigcontext {
627 target_ulong esp_at_signal;
629 target_ulong fpstate; /* pointer */
630 target_ulong oldmask;
634 struct target_ucontext {
635 target_ulong tuc_flags;
636 target_ulong tuc_link;
637 target_stack_t tuc_stack;
638 struct target_sigcontext tuc_mcontext;
639 target_sigset_t tuc_sigmask; /* mask last for extensibility */
644 target_ulong pretcode;
646 struct target_sigcontext sc;
647 struct target_fpstate fpstate;
648 target_ulong extramask[TARGET_NSIG_WORDS-1];
654 target_ulong pretcode;
658 struct target_siginfo info;
659 struct target_ucontext uc;
660 struct target_fpstate fpstate;
665 * Set up a signal frame.
668 /* XXX: save x87 state */
670 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
671 CPUX86State *env, unsigned long mask)
675 err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
676 err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
677 err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
678 err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
679 err |= __put_user(env->regs[R_EDI], &sc->edi);
680 err |= __put_user(env->regs[R_ESI], &sc->esi);
681 err |= __put_user(env->regs[R_EBP], &sc->ebp);
682 err |= __put_user(env->regs[R_ESP], &sc->esp);
683 err |= __put_user(env->regs[R_EBX], &sc->ebx);
684 err |= __put_user(env->regs[R_EDX], &sc->edx);
685 err |= __put_user(env->regs[R_ECX], &sc->ecx);
686 err |= __put_user(env->regs[R_EAX], &sc->eax);
687 err |= __put_user(env->exception_index, &sc->trapno);
688 err |= __put_user(env->error_code, &sc->err);
689 err |= __put_user(env->eip, &sc->eip);
690 err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
691 err |= __put_user(env->eflags, &sc->eflags);
692 err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
693 err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
695 cpu_x86_fsave(env, (void *)fpstate, 1);
696 fpstate->status = fpstate->sw;
697 err |= __put_user(0xffff, &fpstate->magic);
698 err |= __put_user(fpstate, &sc->fpstate);
700 /* non-iBCS2 extensions.. */
701 err |= __put_user(mask, &sc->oldmask);
702 err |= __put_user(env->cr[2], &sc->cr2);
707 * Determine which stack to use..
711 get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
715 /* Default to using normal stack */
716 esp = env->regs[R_ESP];
717 /* This is the X/Open sanctioned signal stack switching. */
718 if (ka->sa.sa_flags & TARGET_SA_ONSTACK) {
719 if (sas_ss_flags(esp) == 0)
720 esp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
723 /* This is the legacy signal stack switching. */
725 if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
726 !(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
727 ka->sa.sa_restorer) {
728 esp = (unsigned long) ka->sa.sa_restorer;
730 return g2h((esp - frame_size) & -8ul);
733 static void setup_frame(int sig, struct emulated_sigaction *ka,
734 target_sigset_t *set, CPUX86State *env)
736 struct sigframe *frame;
739 frame = get_sigframe(ka, env, sizeof(*frame));
741 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
743 err |= __put_user((/*current->exec_domain
744 && current->exec_domain->signal_invmap
746 ? current->exec_domain->signal_invmap[sig]
752 setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
756 for(i = 1; i < TARGET_NSIG_WORDS; i++) {
757 if (__put_user(set->sig[i], &frame->extramask[i - 1]))
761 /* Set up to return from userspace. If provided, use a stub
762 already in userspace. */
763 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
764 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
766 err |= __put_user(frame->retcode, &frame->pretcode);
767 /* This is popl %eax ; movl $,%eax ; int $0x80 */
768 err |= __put_user(0xb858, (short *)(frame->retcode+0));
769 #if defined(TARGET_X86_64)
770 #warning "Fix this !"
772 err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
774 err |= __put_user(0x80cd, (short *)(frame->retcode+6));
780 /* Set up registers for signal handler */
781 env->regs[R_ESP] = h2g(frame);
782 env->eip = (unsigned long) ka->sa._sa_handler;
784 cpu_x86_load_seg(env, R_DS, __USER_DS);
785 cpu_x86_load_seg(env, R_ES, __USER_DS);
786 cpu_x86_load_seg(env, R_SS, __USER_DS);
787 cpu_x86_load_seg(env, R_CS, __USER_CS);
788 env->eflags &= ~TF_MASK;
793 if (sig == TARGET_SIGSEGV)
794 ka->sa._sa_handler = TARGET_SIG_DFL;
795 force_sig(TARGET_SIGSEGV /* , current */);
798 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
799 target_siginfo_t *info,
800 target_sigset_t *set, CPUX86State *env)
802 struct rt_sigframe *frame;
805 frame = get_sigframe(ka, env, sizeof(*frame));
807 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
810 err |= __put_user((/*current->exec_domain
811 && current->exec_domain->signal_invmap
813 ? current->exec_domain->signal_invmap[sig]
816 err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
817 err |= __put_user((target_ulong)&frame->uc, &frame->puc);
818 err |= copy_siginfo_to_user(&frame->info, info);
822 /* Create the ucontext. */
823 err |= __put_user(0, &frame->uc.tuc_flags);
824 err |= __put_user(0, &frame->uc.tuc_link);
825 err |= __put_user(target_sigaltstack_used.ss_sp,
826 &frame->uc.tuc_stack.ss_sp);
827 err |= __put_user(sas_ss_flags(get_sp_from_cpustate(env)),
828 &frame->uc.tuc_stack.ss_flags);
829 err |= __put_user(target_sigaltstack_used.ss_size,
830 &frame->uc.tuc_stack.ss_size);
831 err |= setup_sigcontext(&frame->uc.tuc_mcontext, &frame->fpstate,
833 for(i = 0; i < TARGET_NSIG_WORDS; i++) {
834 if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
838 /* Set up to return from userspace. If provided, use a stub
839 already in userspace. */
840 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
841 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
843 err |= __put_user(frame->retcode, &frame->pretcode);
844 /* This is movl $,%eax ; int $0x80 */
845 err |= __put_user(0xb8, (char *)(frame->retcode+0));
846 err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
847 err |= __put_user(0x80cd, (short *)(frame->retcode+5));
853 /* Set up registers for signal handler */
854 env->regs[R_ESP] = (unsigned long) frame;
855 env->eip = (unsigned long) ka->sa._sa_handler;
857 cpu_x86_load_seg(env, R_DS, __USER_DS);
858 cpu_x86_load_seg(env, R_ES, __USER_DS);
859 cpu_x86_load_seg(env, R_SS, __USER_DS);
860 cpu_x86_load_seg(env, R_CS, __USER_CS);
861 env->eflags &= ~TF_MASK;
866 if (sig == TARGET_SIGSEGV)
867 ka->sa._sa_handler = TARGET_SIG_DFL;
868 force_sig(TARGET_SIGSEGV /* , current */);
872 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
874 unsigned int err = 0;
876 cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
877 cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
878 cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
879 cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
881 env->regs[R_EDI] = ldl(&sc->edi);
882 env->regs[R_ESI] = ldl(&sc->esi);
883 env->regs[R_EBP] = ldl(&sc->ebp);
884 env->regs[R_ESP] = ldl(&sc->esp);
885 env->regs[R_EBX] = ldl(&sc->ebx);
886 env->regs[R_EDX] = ldl(&sc->edx);
887 env->regs[R_ECX] = ldl(&sc->ecx);
888 env->eip = ldl(&sc->eip);
890 cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
891 cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
894 unsigned int tmpflags;
895 tmpflags = ldl(&sc->eflags);
896 env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
897 // regs->orig_eax = -1; /* disable syscall checks */
901 struct _fpstate * buf;
902 buf = (void *)ldl(&sc->fpstate);
905 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
908 cpu_x86_frstor(env, (void *)buf, 1);
912 *peax = ldl(&sc->eax);
920 long do_sigreturn(CPUX86State *env)
922 struct sigframe *frame = (struct sigframe *)g2h(env->regs[R_ESP] - 8);
923 target_sigset_t target_set;
927 #if defined(DEBUG_SIGNAL)
928 fprintf(stderr, "do_sigreturn\n");
930 /* set blocked signals */
931 if (__get_user(target_set.sig[0], &frame->sc.oldmask))
933 for(i = 1; i < TARGET_NSIG_WORDS; i++) {
934 if (__get_user(target_set.sig[i], &frame->extramask[i - 1]))
938 target_to_host_sigset_internal(&set, &target_set);
939 sigprocmask(SIG_SETMASK, &set, NULL);
941 /* restore registers */
942 if (restore_sigcontext(env, &frame->sc, &eax))
947 force_sig(TARGET_SIGSEGV);
951 long do_rt_sigreturn(CPUX86State *env)
953 struct rt_sigframe *frame = (struct rt_sigframe *)g2h(env->regs[R_ESP] - 4);
958 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
961 target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
962 sigprocmask(SIG_SETMASK, &set, NULL);
964 if (restore_sigcontext(env, &frame->uc.tuc_mcontext, &eax))
967 if (do_sigaltstack(&frame->uc.tuc_stack, NULL, get_sp_from_cpustate(env)) == -EFAULT)
973 force_sig(TARGET_SIGSEGV);
977 #elif defined(TARGET_ARM)
979 struct target_sigcontext {
980 target_ulong trap_no;
981 target_ulong error_code;
982 target_ulong oldmask;
993 target_ulong arm_r10;
999 target_ulong arm_cpsr;
1000 target_ulong fault_address;
1003 struct target_ucontext {
1004 target_ulong tuc_flags;
1005 target_ulong tuc_link;
1006 target_stack_t tuc_stack;
1007 struct target_sigcontext tuc_mcontext;
1008 target_sigset_t tuc_sigmask; /* mask last for extensibility */
1013 struct target_sigcontext sc;
1014 target_ulong extramask[TARGET_NSIG_WORDS-1];
1015 target_ulong retcode;
1020 struct target_siginfo *pinfo;
1022 struct target_siginfo info;
1023 struct target_ucontext uc;
1024 target_ulong retcode;
1027 #define TARGET_CONFIG_CPU_32 1
1030 * For ARM syscalls, we encode the syscall number into the instruction.
1032 #define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
1033 #define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
1036 * For Thumb syscalls, we pass the syscall number via r7. We therefore
1037 * need two 16-bit instructions.
1039 #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
1040 #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
1042 static const target_ulong retcodes[4] = {
1043 SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
1044 SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
1048 #define __put_user_error(x,p,e) __put_user(x, p)
1049 #define __get_user_error(x,p,e) __get_user(x, p)
1051 static inline int valid_user_regs(CPUState *regs)
1057 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
1058 CPUState *env, unsigned long mask)
1062 __put_user_error(env->regs[0], &sc->arm_r0, err);
1063 __put_user_error(env->regs[1], &sc->arm_r1, err);
1064 __put_user_error(env->regs[2], &sc->arm_r2, err);
1065 __put_user_error(env->regs[3], &sc->arm_r3, err);
1066 __put_user_error(env->regs[4], &sc->arm_r4, err);
1067 __put_user_error(env->regs[5], &sc->arm_r5, err);
1068 __put_user_error(env->regs[6], &sc->arm_r6, err);
1069 __put_user_error(env->regs[7], &sc->arm_r7, err);
1070 __put_user_error(env->regs[8], &sc->arm_r8, err);
1071 __put_user_error(env->regs[9], &sc->arm_r9, err);
1072 __put_user_error(env->regs[10], &sc->arm_r10, err);
1073 __put_user_error(env->regs[11], &sc->arm_fp, err);
1074 __put_user_error(env->regs[12], &sc->arm_ip, err);
1075 __put_user_error(env->regs[13], &sc->arm_sp, err);
1076 __put_user_error(env->regs[14], &sc->arm_lr, err);
1077 __put_user_error(env->regs[15], &sc->arm_pc, err);
1078 #ifdef TARGET_CONFIG_CPU_32
1079 __put_user_error(cpsr_read(env), &sc->arm_cpsr, err);
1082 __put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err);
1083 __put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err);
1084 __put_user_error(/* current->thread.address */ 0, &sc->fault_address, err);
1085 __put_user_error(mask, &sc->oldmask, err);
1090 static inline void *
1091 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
1093 unsigned long sp = regs->regs[13];
1096 * This is the X/Open sanctioned signal stack switching.
1098 if ((ka->sa.sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp))
1099 sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
1101 * ATPCS B01 mandates 8-byte alignment
1103 return g2h((sp - framesize) & ~7);
1107 setup_return(CPUState *env, struct emulated_sigaction *ka,
1108 target_ulong *rc, void *frame, int usig)
1110 target_ulong handler = (target_ulong)ka->sa._sa_handler;
1111 target_ulong retcode;
1113 #if defined(TARGET_CONFIG_CPU_32)
1115 target_ulong cpsr = env->cpsr;
1118 * Maybe we need to deliver a 32-bit signal to a 26-bit task.
1120 if (ka->sa.sa_flags & SA_THIRTYTWO)
1121 cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
1123 #ifdef CONFIG_ARM_THUMB
1124 if (elf_hwcap & HWCAP_THUMB) {
1126 * The LSB of the handler determines if we're going to
1127 * be using THUMB or ARM mode for this signal handler.
1129 thumb = handler & 1;
1136 #endif /* CONFIG_ARM_THUMB */
1138 #endif /* TARGET_CONFIG_CPU_32 */
1140 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
1141 retcode = (target_ulong)ka->sa.sa_restorer;
1143 unsigned int idx = thumb;
1145 if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
1148 if (__put_user(retcodes[idx], rc))
1151 flush_icache_range((target_ulong)rc,
1152 (target_ulong)(rc + 1));
1154 retcode = ((target_ulong)rc) + thumb;
1157 env->regs[0] = usig;
1158 env->regs[13] = h2g(frame);
1159 env->regs[14] = retcode;
1160 env->regs[15] = handler & (thumb ? ~1 : ~3);
1163 #ifdef TARGET_CONFIG_CPU_32
1171 static void setup_frame(int usig, struct emulated_sigaction *ka,
1172 target_sigset_t *set, CPUState *regs)
1174 struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
1177 err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
1179 for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1180 if (__put_user(set->sig[i], &frame->extramask[i - 1]))
1185 err = setup_return(regs, ka, &frame->retcode, frame, usig);
1189 static void setup_rt_frame(int usig, struct emulated_sigaction *ka,
1190 target_siginfo_t *info,
1191 target_sigset_t *set, CPUState *env)
1193 struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame));
1194 struct target_sigaltstack stack;
1197 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
1200 __put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err);
1201 __put_user_error(&frame->uc, (target_ulong *)&frame->puc, err);
1202 err |= copy_siginfo_to_user(&frame->info, info);
1204 /* Clear all the bits of the ucontext we don't use. */
1205 memset(&frame->uc, 0, offsetof(struct target_ucontext, tuc_mcontext));
1207 memset(&stack, 0, sizeof(stack));
1208 __put_user(target_sigaltstack_used.ss_sp, &stack.ss_sp);
1209 __put_user(target_sigaltstack_used.ss_size, &stack.ss_size);
1210 __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &stack.ss_flags);
1211 if (!access_ok(VERIFY_WRITE, &frame->uc.tuc_stack, sizeof(stack)))
1214 memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
1216 err |= setup_sigcontext(&frame->uc.tuc_mcontext, /*&frame->fpstate,*/
1218 for(i = 0; i < TARGET_NSIG_WORDS; i++) {
1219 if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]))
1224 err = setup_return(env, ka, &frame->retcode, frame, usig);
1228 * For realtime signals we must also set the second and third
1229 * arguments for the signal handler.
1230 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
1232 env->regs[1] = (target_ulong)frame->pinfo;
1233 env->regs[2] = (target_ulong)frame->puc;
1240 restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
1245 __get_user_error(env->regs[0], &sc->arm_r0, err);
1246 __get_user_error(env->regs[1], &sc->arm_r1, err);
1247 __get_user_error(env->regs[2], &sc->arm_r2, err);
1248 __get_user_error(env->regs[3], &sc->arm_r3, err);
1249 __get_user_error(env->regs[4], &sc->arm_r4, err);
1250 __get_user_error(env->regs[5], &sc->arm_r5, err);
1251 __get_user_error(env->regs[6], &sc->arm_r6, err);
1252 __get_user_error(env->regs[7], &sc->arm_r7, err);
1253 __get_user_error(env->regs[8], &sc->arm_r8, err);
1254 __get_user_error(env->regs[9], &sc->arm_r9, err);
1255 __get_user_error(env->regs[10], &sc->arm_r10, err);
1256 __get_user_error(env->regs[11], &sc->arm_fp, err);
1257 __get_user_error(env->regs[12], &sc->arm_ip, err);
1258 __get_user_error(env->regs[13], &sc->arm_sp, err);
1259 __get_user_error(env->regs[14], &sc->arm_lr, err);
1260 __get_user_error(env->regs[15], &sc->arm_pc, err);
1261 #ifdef TARGET_CONFIG_CPU_32
1262 __get_user_error(cpsr, &sc->arm_cpsr, err);
1263 cpsr_write(env, cpsr, 0xffffffff);
1266 err |= !valid_user_regs(env);
1271 long do_sigreturn(CPUState *env)
1273 struct sigframe *frame;
1274 target_sigset_t set;
1279 * Since we stacked the signal on a 64-bit boundary,
1280 * then 'sp' should be word aligned here. If it's
1281 * not, then the user is trying to mess with us.
1283 if (env->regs[13] & 7)
1286 frame = (struct sigframe *)g2h(env->regs[13]);
1289 if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1292 if (__get_user(set.sig[0], &frame->sc.oldmask))
1294 for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1295 if (__get_user(set.sig[i], &frame->extramask[i - 1]))
1299 target_to_host_sigset_internal(&host_set, &set);
1300 sigprocmask(SIG_SETMASK, &host_set, NULL);
1302 if (restore_sigcontext(env, &frame->sc))
1306 /* Send SIGTRAP if we're single-stepping */
1307 if (ptrace_cancel_bpt(current))
1308 send_sig(SIGTRAP, current, 1);
1310 return env->regs[0];
1313 force_sig(SIGSEGV /* , current */);
1317 long do_rt_sigreturn(CPUState *env)
1319 struct rt_sigframe *frame;
1323 * Since we stacked the signal on a 64-bit boundary,
1324 * then 'sp' should be word aligned here. If it's
1325 * not, then the user is trying to mess with us.
1327 if (env->regs[13] & 7)
1330 frame = (struct rt_sigframe *)env->regs[13];
1333 if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1336 target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
1337 sigprocmask(SIG_SETMASK, &host_set, NULL);
1339 if (restore_sigcontext(env, &frame->uc.tuc_mcontext))
1342 if (do_sigaltstack(&frame->uc.tuc_stack, NULL, get_sp_from_cpustate(env)) == -EFAULT)
1346 /* Send SIGTRAP if we're single-stepping */
1347 if (ptrace_cancel_bpt(current))
1348 send_sig(SIGTRAP, current, 1);
1350 return env->regs[0];
1353 force_sig(SIGSEGV /* , current */);
1357 #elif defined(TARGET_SPARC)
1359 #define __SUNOS_MAXWIN 31
1361 /* This is what SunOS does, so shall I. */
1362 struct target_sigcontext {
1363 target_ulong sigc_onstack; /* state to restore */
1365 target_ulong sigc_mask; /* sigmask to restore */
1366 target_ulong sigc_sp; /* stack pointer */
1367 target_ulong sigc_pc; /* program counter */
1368 target_ulong sigc_npc; /* next program counter */
1369 target_ulong sigc_psr; /* for condition codes etc */
1370 target_ulong sigc_g1; /* User uses these two registers */
1371 target_ulong sigc_o0; /* within the trampoline code. */
1373 /* Now comes information regarding the users window set
1374 * at the time of the signal.
1376 target_ulong sigc_oswins; /* outstanding windows */
1378 /* stack ptrs for each regwin buf */
1379 char *sigc_spbuf[__SUNOS_MAXWIN];
1381 /* Windows to restore after signal */
1383 target_ulong locals[8];
1384 target_ulong ins[8];
1385 } sigc_wbuf[__SUNOS_MAXWIN];
1387 /* A Sparc stack frame */
1388 struct sparc_stackf {
1389 target_ulong locals[8];
1390 target_ulong ins[6];
1391 struct sparc_stackf *fp;
1392 target_ulong callers_pc;
1394 target_ulong xargs[6];
1395 target_ulong xxargs[1];
1404 target_ulong u_regs[16]; /* globals and ins */
1410 unsigned long si_float_regs [32];
1411 unsigned long si_fsr;
1412 unsigned long si_fpqdepth;
1414 unsigned long *insn_addr;
1417 } qemu_siginfo_fpu_t;
1420 struct target_signal_frame {
1421 struct sparc_stackf ss;
1423 qemu_siginfo_fpu_t *fpu_save;
1424 target_ulong insns[2] __attribute__ ((aligned (8)));
1425 target_ulong extramask[TARGET_NSIG_WORDS - 1];
1426 target_ulong extra_size; /* Should be 0 */
1427 qemu_siginfo_fpu_t fpu_state;
1429 struct target_rt_signal_frame {
1430 struct sparc_stackf ss;
1432 target_ulong regs[20];
1434 qemu_siginfo_fpu_t *fpu_save;
1435 unsigned int insns[2];
1437 unsigned int extra_size; /* Should be 0 */
1438 qemu_siginfo_fpu_t fpu_state;
1449 #define UREG_FP UREG_I6
1450 #define UREG_SP UREG_O6
1452 static inline void *get_sigframe(struct emulated_sigaction *sa, CPUState *env, unsigned long framesize)
1456 sp = env->regwptr[UREG_FP];
1458 /* This is the X/Open sanctioned signal stack switching. */
1459 if (sa->sa.sa_flags & TARGET_SA_ONSTACK) {
1460 if (!on_sig_stack(sp)
1461 && !((target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size) & 7))
1462 sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
1464 return g2h(sp - framesize);
1468 setup___siginfo(__siginfo_t *si, CPUState *env, target_ulong mask)
1472 err |= __put_user(env->psr, &si->si_regs.psr);
1473 err |= __put_user(env->pc, &si->si_regs.pc);
1474 err |= __put_user(env->npc, &si->si_regs.npc);
1475 err |= __put_user(env->y, &si->si_regs.y);
1476 for (i=0; i < 8; i++) {
1477 err |= __put_user(env->gregs[i], &si->si_regs.u_regs[i]);
1479 for (i=0; i < 8; i++) {
1480 err |= __put_user(env->regwptr[UREG_I0 + i], &si->si_regs.u_regs[i+8]);
1482 err |= __put_user(mask, &si->si_mask);
1488 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
1489 CPUState *env, unsigned long mask)
1493 err |= __put_user(mask, &sc->sigc_mask);
1494 err |= __put_user(env->regwptr[UREG_SP], &sc->sigc_sp);
1495 err |= __put_user(env->pc, &sc->sigc_pc);
1496 err |= __put_user(env->npc, &sc->sigc_npc);
1497 err |= __put_user(env->psr, &sc->sigc_psr);
1498 err |= __put_user(env->gregs[1], &sc->sigc_g1);
1499 err |= __put_user(env->regwptr[UREG_O0], &sc->sigc_o0);
1504 #define NF_ALIGNEDSZ (((sizeof(struct target_signal_frame) + 7) & (~7)))
1506 static void setup_frame(int sig, struct emulated_sigaction *ka,
1507 target_sigset_t *set, CPUState *env)
1509 struct target_signal_frame *sf;
1510 int sigframe_size, err, i;
1512 /* 1. Make sure everything is clean */
1513 //synchronize_user_stack();
1515 sigframe_size = NF_ALIGNEDSZ;
1517 sf = (struct target_signal_frame *)
1518 get_sigframe(ka, env, sigframe_size);
1520 //fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
1522 if (invalid_frame_pointer(sf, sigframe_size))
1523 goto sigill_and_return;
1525 /* 2. Save the current process state */
1526 err = setup___siginfo(&sf->info, env, set->sig[0]);
1527 err |= __put_user(0, &sf->extra_size);
1529 //err |= save_fpu_state(regs, &sf->fpu_state);
1530 //err |= __put_user(&sf->fpu_state, &sf->fpu_save);
1532 err |= __put_user(set->sig[0], &sf->info.si_mask);
1533 for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) {
1534 err |= __put_user(set->sig[i + 1], &sf->extramask[i]);
1537 for (i = 0; i < 8; i++) {
1538 err |= __put_user(env->regwptr[i + UREG_L0], &sf->ss.locals[i]);
1540 for (i = 0; i < 8; i++) {
1541 err |= __put_user(env->regwptr[i + UREG_I0], &sf->ss.ins[i]);
1546 /* 3. signal handler back-trampoline and parameters */
1547 env->regwptr[UREG_FP] = h2g(sf);
1548 env->regwptr[UREG_I0] = sig;
1549 env->regwptr[UREG_I1] = h2g(&sf->info);
1550 env->regwptr[UREG_I2] = h2g(&sf->info);
1552 /* 4. signal handler */
1553 env->pc = (unsigned long) ka->sa._sa_handler;
1554 env->npc = (env->pc + 4);
1555 /* 5. return to kernel instructions */
1556 if (ka->sa.sa_restorer)
1557 env->regwptr[UREG_I7] = (unsigned long)ka->sa.sa_restorer;
1559 env->regwptr[UREG_I7] = h2g(&(sf->insns[0]) - 2);
1561 /* mov __NR_sigreturn, %g1 */
1562 err |= __put_user(0x821020d8, &sf->insns[0]);
1565 err |= __put_user(0x91d02010, &sf->insns[1]);
1569 /* Flush instruction space. */
1570 //flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
1575 //sigill_and_return:
1576 force_sig(TARGET_SIGILL);
1578 //fprintf(stderr, "force_sig\n");
1579 force_sig(TARGET_SIGSEGV);
1582 restore_fpu_state(CPUState *env, qemu_siginfo_fpu_t *fpu)
1587 if (current->flags & PF_USEDFPU)
1588 regs->psr &= ~PSR_EF;
1590 if (current == last_task_used_math) {
1591 last_task_used_math = 0;
1592 regs->psr &= ~PSR_EF;
1595 current->used_math = 1;
1596 current->flags &= ~PF_USEDFPU;
1599 if (verify_area (VERIFY_READ, fpu, sizeof(*fpu)))
1604 /* XXX: incorrect */
1605 err = __copy_from_user(&env->fpr[0], &fpu->si_float_regs[0],
1606 (sizeof(unsigned long) * 32));
1608 err |= __get_user(env->fsr, &fpu->si_fsr);
1610 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
1611 if (current->thread.fpqdepth != 0)
1612 err |= __copy_from_user(¤t->thread.fpqueue[0],
1613 &fpu->si_fpqueue[0],
1614 ((sizeof(unsigned long) +
1615 (sizeof(unsigned long *)))*16));
1621 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1622 target_siginfo_t *info,
1623 target_sigset_t *set, CPUState *env)
1625 fprintf(stderr, "setup_rt_frame: not implemented\n");
1628 long do_sigreturn(CPUState *env)
1630 struct target_signal_frame *sf;
1631 uint32_t up_psr, pc, npc;
1632 target_sigset_t set;
1634 target_ulong fpu_save;
1637 sf = (struct target_signal_frame *)g2h(env->regwptr[UREG_FP]);
1639 fprintf(stderr, "sigreturn\n");
1640 fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]);
1642 //cpu_dump_state(env, stderr, fprintf, 0);
1644 /* 1. Make sure we are not getting garbage from the user */
1646 if (verify_area (VERIFY_READ, sf, sizeof (*sf)))
1650 if (((uint) sf) & 3)
1653 err = __get_user(pc, &sf->info.si_regs.pc);
1654 err |= __get_user(npc, &sf->info.si_regs.npc);
1659 /* 2. Restore the state */
1660 err |= __get_user(up_psr, &sf->info.si_regs.psr);
1662 /* User can only change condition codes and FPU enabling in %psr. */
1663 env->psr = (up_psr & (PSR_ICC /* | PSR_EF */))
1664 | (env->psr & ~(PSR_ICC /* | PSR_EF */));
1668 err |= __get_user(env->y, &sf->info.si_regs.y);
1669 for (i=0; i < 8; i++) {
1670 err |= __get_user(env->gregs[i], &sf->info.si_regs.u_regs[i]);
1672 for (i=0; i < 8; i++) {
1673 err |= __get_user(env->regwptr[i + UREG_I0], &sf->info.si_regs.u_regs[i+8]);
1676 err |= __get_user(fpu_save, (target_ulong *)&sf->fpu_save);
1679 // err |= restore_fpu_state(env, fpu_save);
1681 /* This is pretty much atomic, no amount locking would prevent
1682 * the races which exist anyways.
1684 err |= __get_user(set.sig[0], &sf->info.si_mask);
1685 for(i = 1; i < TARGET_NSIG_WORDS; i++) {
1686 err |= (__get_user(set.sig[i], &sf->extramask[i - 1]));
1689 target_to_host_sigset_internal(&host_set, &set);
1690 sigprocmask(SIG_SETMASK, &host_set, NULL);
1695 return env->regwptr[0];
1698 force_sig(TARGET_SIGSEGV);
1701 long do_rt_sigreturn(CPUState *env)
1703 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1707 #elif defined(TARGET_MIPS64)
1709 # warning signal handling not implemented
1711 static void setup_frame(int sig, struct emulated_sigaction *ka,
1712 target_sigset_t *set, CPUState *env)
1714 fprintf(stderr, "setup_frame: not implemented\n");
1717 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1718 target_siginfo_t *info,
1719 target_sigset_t *set, CPUState *env)
1721 fprintf(stderr, "setup_rt_frame: not implemented\n");
1724 long do_sigreturn(CPUState *env)
1726 fprintf(stderr, "do_sigreturn: not implemented\n");
1730 long do_rt_sigreturn(CPUState *env)
1732 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1736 #elif defined(TARGET_MIPSN32)
1738 # warning signal handling not implemented
1740 static void setup_frame(int sig, struct emulated_sigaction *ka,
1741 target_sigset_t *set, CPUState *env)
1743 fprintf(stderr, "setup_frame: not implemented\n");
1746 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1747 target_siginfo_t *info,
1748 target_sigset_t *set, CPUState *env)
1750 fprintf(stderr, "setup_rt_frame: not implemented\n");
1753 long do_sigreturn(CPUState *env)
1755 fprintf(stderr, "do_sigreturn: not implemented\n");
1759 long do_rt_sigreturn(CPUState *env)
1761 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1765 #elif defined(TARGET_MIPS)
1767 struct target_sigcontext {
1768 uint32_t sc_regmask; /* Unused */
1771 uint64_t sc_regs[32];
1772 uint64_t sc_fpregs[32];
1773 uint32_t sc_ownedfp; /* Unused */
1774 uint32_t sc_fpc_csr;
1775 uint32_t sc_fpc_eir; /* Unused */
1776 uint32_t sc_used_math;
1777 uint32_t sc_dsp; /* dsp status, was sc_ssflags */
1780 target_ulong sc_hi1; /* Was sc_cause */
1781 target_ulong sc_lo1; /* Was sc_badvaddr */
1782 target_ulong sc_hi2; /* Was sc_sigset[4] */
1783 target_ulong sc_lo2;
1784 target_ulong sc_hi3;
1785 target_ulong sc_lo3;
1789 uint32_t sf_ass[4]; /* argument save space for o32 */
1790 uint32_t sf_code[2]; /* signal trampoline */
1791 struct target_sigcontext sf_sc;
1792 target_sigset_t sf_mask;
1795 /* Install trampoline to jump back from signal handler */
1796 static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall)
1801 * Set up the return code ...
1803 * li v0, __NR__foo_sigreturn
1807 err = __put_user(0x24020000 + syscall, tramp + 0);
1808 err |= __put_user(0x0000000c , tramp + 1);
1809 /* flush_cache_sigtramp((unsigned long) tramp); */
1814 setup_sigcontext(CPUState *regs, struct target_sigcontext *sc)
1818 err |= __put_user(regs->PC[regs->current_tc], &sc->sc_pc);
1820 #define save_gp_reg(i) do { \
1821 err |= __put_user(regs->gpr[i][regs->current_tc], &sc->sc_regs[i]); \
1823 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
1824 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
1825 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
1826 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
1827 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
1828 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
1829 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
1830 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
1834 err |= __put_user(regs->HI[0][regs->current_tc], &sc->sc_mdhi);
1835 err |= __put_user(regs->LO[0][regs->current_tc], &sc->sc_mdlo);
1837 /* Not used yet, but might be useful if we ever have DSP suppport */
1840 err |= __put_user(mfhi1(), &sc->sc_hi1);
1841 err |= __put_user(mflo1(), &sc->sc_lo1);
1842 err |= __put_user(mfhi2(), &sc->sc_hi2);
1843 err |= __put_user(mflo2(), &sc->sc_lo2);
1844 err |= __put_user(mfhi3(), &sc->sc_hi3);
1845 err |= __put_user(mflo3(), &sc->sc_lo3);
1846 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
1848 /* same with 64 bit */
1850 err |= __put_user(regs->hi, &sc->sc_hi[0]);
1851 err |= __put_user(regs->lo, &sc->sc_lo[0]);
1853 err |= __put_user(mfhi1(), &sc->sc_hi[1]);
1854 err |= __put_user(mflo1(), &sc->sc_lo[1]);
1855 err |= __put_user(mfhi2(), &sc->sc_hi[2]);
1856 err |= __put_user(mflo2(), &sc->sc_lo[2]);
1857 err |= __put_user(mfhi3(), &sc->sc_hi[3]);
1858 err |= __put_user(mflo3(), &sc->sc_lo[3]);
1859 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
1865 err |= __put_user(!!used_math(), &sc->sc_used_math);
1871 * Save FPU state to signal context. Signal handler will "inherit"
1872 * current FPU state.
1876 if (!is_fpu_owner()) {
1878 restore_fp(current);
1880 err |= save_fp_context(sc);
1889 restore_sigcontext(CPUState *regs, struct target_sigcontext *sc)
1893 err |= __get_user(regs->CP0_EPC, &sc->sc_pc);
1895 err |= __get_user(regs->HI[0][regs->current_tc], &sc->sc_mdhi);
1896 err |= __get_user(regs->LO[0][regs->current_tc], &sc->sc_mdlo);
1898 #define restore_gp_reg(i) do { \
1899 err |= __get_user(regs->gpr[i][regs->current_tc], &sc->sc_regs[i]); \
1901 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
1902 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
1903 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
1904 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
1905 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
1906 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
1907 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
1908 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
1909 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
1910 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
1912 #undef restore_gp_reg
1916 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
1917 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
1918 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
1919 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
1920 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
1921 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
1922 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
1925 err |= __get_user(regs->hi, &sc->sc_hi[0]);
1926 err |= __get_user(regs->lo, &sc->sc_lo[0]);
1928 err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
1929 err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
1930 err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
1931 err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
1932 err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
1933 err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
1934 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
1938 err |= __get_user(used_math, &sc->sc_used_math);
1939 conditional_used_math(used_math);
1944 /* restore fpu context if we have used it before */
1946 err |= restore_fp_context(sc);
1948 /* signal handler may have used FPU. Give it up. */
1957 * Determine which stack to use..
1959 static inline void *
1960 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, size_t frame_size)
1964 /* Default to using normal stack */
1965 sp = regs->gpr[29][regs->current_tc];
1968 * FPU emulator may have it's own trampoline active just
1969 * above the user stack, 16-bytes before the next lowest
1970 * 16 byte boundary. Try to avoid trashing it.
1974 /* This is the X/Open sanctioned signal stack switching. */
1975 if ((ka->sa.sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags (sp) == 0)) {
1976 sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
1979 return g2h((sp - frame_size) & ~7);
1982 static void setup_frame(int sig, struct emulated_sigaction * ka,
1983 target_sigset_t *set, CPUState *regs)
1985 struct sigframe *frame;
1988 frame = get_sigframe(ka, regs, sizeof(*frame));
1989 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
1992 install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
1994 if(setup_sigcontext(regs, &frame->sf_sc))
1997 for(i = 0; i < TARGET_NSIG_WORDS; i++) {
1998 if(__put_user(set->sig[i], &frame->sf_mask.sig[i]))
2003 * Arguments to signal handler:
2005 * a0 = signal number
2006 * a1 = 0 (should be cause)
2007 * a2 = pointer to struct sigcontext
2009 * $25 and PC point to the signal handler, $29 points to the
2012 regs->gpr[ 4][regs->current_tc] = sig;
2013 regs->gpr[ 5][regs->current_tc] = 0;
2014 regs->gpr[ 6][regs->current_tc] = h2g(&frame->sf_sc);
2015 regs->gpr[29][regs->current_tc] = h2g(frame);
2016 regs->gpr[31][regs->current_tc] = h2g(frame->sf_code);
2017 /* The original kernel code sets CP0_EPC to the handler
2018 * since it returns to userland using eret
2019 * we cannot do this here, and we must set PC directly */
2020 regs->PC[regs->current_tc] = regs->gpr[25][regs->current_tc] = ka->sa._sa_handler;
2024 force_sig(TARGET_SIGSEGV/*, current*/);
2028 long do_sigreturn(CPUState *regs)
2030 struct sigframe *frame;
2032 target_sigset_t target_set;
2035 #if defined(DEBUG_SIGNAL)
2036 fprintf(stderr, "do_sigreturn\n");
2038 frame = (struct sigframe *) regs->gpr[29][regs->current_tc];
2039 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
2042 for(i = 0; i < TARGET_NSIG_WORDS; i++) {
2043 if(__get_user(target_set.sig[i], &frame->sf_mask.sig[i]))
2047 target_to_host_sigset_internal(&blocked, &target_set);
2048 sigprocmask(SIG_SETMASK, &blocked, NULL);
2050 if (restore_sigcontext(regs, &frame->sf_sc))
2055 * Don't let your children do this ...
2057 __asm__ __volatile__(
2065 regs->PC[regs->current_tc] = regs->CP0_EPC;
2066 /* I am not sure this is right, but it seems to work
2067 * maybe a problem with nested signals ? */
2072 force_sig(TARGET_SIGSEGV/*, current*/);
2076 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
2077 target_siginfo_t *info,
2078 target_sigset_t *set, CPUState *env)
2080 fprintf(stderr, "setup_rt_frame: not implemented\n");
2083 long do_rt_sigreturn(CPUState *env)
2085 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
2091 static void setup_frame(int sig, struct emulated_sigaction *ka,
2092 target_sigset_t *set, CPUState *env)
2094 fprintf(stderr, "setup_frame: not implemented\n");
2097 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
2098 target_siginfo_t *info,
2099 target_sigset_t *set, CPUState *env)
2101 fprintf(stderr, "setup_rt_frame: not implemented\n");
2104 long do_sigreturn(CPUState *env)
2106 fprintf(stderr, "do_sigreturn: not implemented\n");
2110 long do_rt_sigreturn(CPUState *env)
2112 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
2118 void process_pending_signals(void *cpu_env)
2121 target_ulong handler;
2122 sigset_t set, old_set;
2123 target_sigset_t target_old_set;
2124 struct emulated_sigaction *k;
2127 if (!signal_pending)
2131 for(sig = 1; sig <= TARGET_NSIG; sig++) {
2136 /* if no signal is pending, just return */
2142 fprintf(stderr, "qemu: process signal %d\n", sig);
2144 /* dequeue signal */
2150 sig = gdb_handlesig (cpu_env, sig);
2152 fprintf (stderr, "Lost signal\n");
2156 handler = k->sa._sa_handler;
2157 if (handler == TARGET_SIG_DFL) {
2158 /* default handler : ignore some signal. The other are fatal */
2159 if (sig != TARGET_SIGCHLD &&
2160 sig != TARGET_SIGURG &&
2161 sig != TARGET_SIGWINCH) {
2164 } else if (handler == TARGET_SIG_IGN) {
2166 } else if (handler == TARGET_SIG_ERR) {
2169 /* compute the blocked signals during the handler execution */
2170 target_to_host_sigset(&set, &k->sa.sa_mask);
2171 /* SA_NODEFER indicates that the current signal should not be
2172 blocked during the handler */
2173 if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
2174 sigaddset(&set, target_to_host_signal(sig));
2176 /* block signals in the handler using Linux */
2177 sigprocmask(SIG_BLOCK, &set, &old_set);
2178 /* save the previous blocked signal state to restore it at the
2179 end of the signal execution (see do_sigreturn) */
2180 host_to_target_sigset_internal(&target_old_set, &old_set);
2182 /* if the CPU is in VM86 mode, we restore the 32 bit values */
2183 #if defined(TARGET_I386) && !defined(TARGET_X86_64)
2185 CPUX86State *env = cpu_env;
2186 if (env->eflags & VM_MASK)
2187 save_v86_state(env);
2190 /* prepare the stack frame of the virtual CPU */
2191 if (k->sa.sa_flags & TARGET_SA_SIGINFO)
2192 setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
2194 setup_frame(sig, k, &target_old_set, cpu_env);
2195 if (k->sa.sa_flags & TARGET_SA_RESETHAND)
2196 k->sa._sa_handler = TARGET_SIG_DFL;