2 * Emulation of Linux signals
4 * Copyright (c) 2003 Fabrice Bellard
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <sys/ucontext.h>
38 //#define DEBUG_SIGNAL
40 #define MAX_SIGQUEUE_SIZE 1024
43 struct sigqueue *next;
44 target_siginfo_t info;
47 struct emulated_sigaction {
48 struct target_sigaction sa;
49 int pending; /* true if signal is pending */
50 struct sigqueue *first;
51 struct sigqueue info; /* in order to always have memory for the
52 first signal, we put it here */
55 static struct emulated_sigaction sigact_table[TARGET_NSIG];
56 static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
57 static struct sigqueue *first_free; /* first free siginfo queue entry */
58 static int signal_pending; /* non zero if a signal may be pending */
60 static void host_signal_handler(int host_signum, siginfo_t *info,
63 /* XXX: do it properly */
64 static inline int host_to_target_signal(int sig)
69 static inline int target_to_host_signal(int sig)
74 void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
77 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
78 d->sig[i] = tswapl(((unsigned long *)s)[i]);
82 void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
85 for(i = 0;i < TARGET_NSIG_WORDS; i++) {
86 ((unsigned long *)d)[i] = tswapl(s->sig[i]);
90 void host_to_target_old_sigset(target_ulong *old_sigset,
91 const sigset_t *sigset)
93 *old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff);
96 void target_to_host_old_sigset(sigset_t *sigset,
97 const target_ulong *old_sigset)
100 *(unsigned long *)sigset = tswapl(*old_sigset);
103 /* siginfo conversion */
105 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
106 const siginfo_t *info)
109 sig = host_to_target_signal(info->si_signo);
110 tinfo->si_signo = sig;
113 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
114 sig == SIGBUS || sig == SIGTRAP) {
115 /* should never come here, but who knows. The information for
116 the target is irrelevant */
117 tinfo->_sifields._sigfault._addr = 0;
118 } else if (sig >= TARGET_SIGRTMIN) {
119 tinfo->_sifields._rt._pid = info->si_pid;
120 tinfo->_sifields._rt._uid = info->si_uid;
121 /* XXX: potential problem if 64 bit */
122 tinfo->_sifields._rt._sigval.sival_ptr =
123 (target_ulong)info->si_value.sival_ptr;
127 static void tswap_siginfo(target_siginfo_t *tinfo,
128 const target_siginfo_t *info)
131 sig = info->si_signo;
132 tinfo->si_signo = tswap32(sig);
133 tinfo->si_errno = tswap32(info->si_errno);
134 tinfo->si_code = tswap32(info->si_code);
135 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
136 sig == SIGBUS || sig == SIGTRAP) {
137 tinfo->_sifields._sigfault._addr =
138 tswapl(info->_sifields._sigfault._addr);
139 } else if (sig >= TARGET_SIGRTMIN) {
140 tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
141 tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
142 tinfo->_sifields._rt._sigval.sival_ptr =
143 tswapl(info->_sifields._rt._sigval.sival_ptr);
148 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
150 host_to_target_siginfo_noswap(tinfo, info);
151 tswap_siginfo(tinfo, tinfo);
154 /* XXX: we support only POSIX RT signals are used. */
155 /* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
156 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
158 info->si_signo = tswap32(tinfo->si_signo);
159 info->si_errno = tswap32(tinfo->si_errno);
160 info->si_code = tswap32(tinfo->si_code);
161 info->si_pid = tswap32(tinfo->_sifields._rt._pid);
162 info->si_uid = tswap32(tinfo->_sifields._rt._uid);
163 info->si_value.sival_ptr =
164 (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
167 void signal_init(void)
169 struct sigaction act;
172 /* set all host signal handlers. ALL signals are blocked during
173 the handlers to serialize them. */
174 sigfillset(&act.sa_mask);
175 act.sa_flags = SA_SIGINFO;
176 act.sa_sigaction = host_signal_handler;
177 for(i = 1; i < NSIG; i++) {
178 sigaction(i, &act, NULL);
181 memset(sigact_table, 0, sizeof(sigact_table));
183 first_free = &sigqueue_table[0];
184 for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
185 sigqueue_table[i].next = &sigqueue_table[i + 1];
186 sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
189 /* signal queue handling */
191 static inline struct sigqueue *alloc_sigqueue(void)
193 struct sigqueue *q = first_free;
196 first_free = q->next;
200 static inline void free_sigqueue(struct sigqueue *q)
202 q->next = first_free;
206 /* abort execution with signal */
207 void __attribute((noreturn)) force_sig(int sig)
210 host_sig = target_to_host_signal(sig);
211 fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
212 sig, strsignal(host_sig));
217 struct sigaction act;
218 sigemptyset(&act.sa_mask);
219 act.sa_flags = SA_SIGINFO;
220 act.sa_sigaction = SIG_DFL;
221 sigaction(SIGABRT, &act, NULL);
227 /* queue a signal so that it will be send to the virtual CPU as soon
229 int queue_signal(int sig, target_siginfo_t *info)
231 struct emulated_sigaction *k;
232 struct sigqueue *q, **pq;
233 target_ulong handler;
235 #if defined(DEBUG_SIGNAL)
236 fprintf(stderr, "queue_signal: sig=%d\n",
239 k = &sigact_table[sig - 1];
240 handler = k->sa._sa_handler;
241 if (handler == TARGET_SIG_DFL) {
242 /* default handler : ignore some signal. The other are fatal */
243 if (sig != TARGET_SIGCHLD &&
244 sig != TARGET_SIGURG &&
245 sig != TARGET_SIGWINCH) {
248 return 0; /* indicate ignored */
250 } else if (handler == TARGET_SIG_IGN) {
253 } else if (handler == TARGET_SIG_ERR) {
257 if (sig < TARGET_SIGRTMIN) {
258 /* if non real time signal, we queue exactly one signal */
268 q = alloc_sigqueue();
279 /* signal that a new signal is pending */
281 return 1; /* indicates that the signal was queued */
285 #if defined(DEBUG_SIGNAL)
287 static void dump_regs(struct ucontext *uc)
290 "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
291 "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
292 "EFL=%08x EIP=%08x\n",
293 uc->uc_mcontext.gregs[EAX],
294 uc->uc_mcontext.gregs[EBX],
295 uc->uc_mcontext.gregs[ECX],
296 uc->uc_mcontext.gregs[EDX],
297 uc->uc_mcontext.gregs[ESI],
298 uc->uc_mcontext.gregs[EDI],
299 uc->uc_mcontext.gregs[EBP],
300 uc->uc_mcontext.gregs[ESP],
301 uc->uc_mcontext.gregs[EFL],
302 uc->uc_mcontext.gregs[EIP]);
305 static void dump_regs(struct ucontext *uc)
312 static void host_signal_handler(int host_signum, siginfo_t *info,
316 target_siginfo_t tinfo;
318 /* the CPU emulator uses some host signals to detect exceptions,
319 we we forward to it some signals */
320 if (host_signum == SIGSEGV || host_signum == SIGBUS) {
321 if (cpu_signal_handler(host_signum, info, puc))
325 /* get target signal number */
326 sig = host_to_target_signal(host_signum);
327 if (sig < 1 || sig > TARGET_NSIG)
329 #if defined(DEBUG_SIGNAL)
330 fprintf(stderr, "qemu: got signal %d\n", sig);
333 host_to_target_siginfo_noswap(&tinfo, info);
334 if (queue_signal(sig, &tinfo) == 1) {
335 /* interrupt the virtual CPU as soon as possible */
336 cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
340 int do_sigaction(int sig, const struct target_sigaction *act,
341 struct target_sigaction *oact)
343 struct emulated_sigaction *k;
345 if (sig < 1 || sig > TARGET_NSIG)
347 k = &sigact_table[sig - 1];
348 #if defined(DEBUG_SIGNAL) && 0
349 fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
350 sig, (int)act, (int)oact);
353 oact->_sa_handler = tswapl(k->sa._sa_handler);
354 oact->sa_flags = tswapl(k->sa.sa_flags);
355 oact->sa_restorer = tswapl(k->sa.sa_restorer);
356 oact->sa_mask = k->sa.sa_mask;
359 k->sa._sa_handler = tswapl(act->_sa_handler);
360 k->sa.sa_flags = tswapl(act->sa_flags);
361 k->sa.sa_restorer = tswapl(act->sa_restorer);
362 k->sa.sa_mask = act->sa_mask;
367 #define __put_user(x,ptr)\
369 int size = sizeof(*ptr);\
372 stb(ptr, (typeof(*ptr))(x));\
375 stw(ptr, (typeof(*ptr))(x));\
378 stl(ptr, (typeof(*ptr))(x));\
381 stq(ptr, (typeof(*ptr))(x));\
389 #define __get_user(x, ptr) \
391 int size = sizeof(*ptr);\
394 x = (typeof(*ptr))ldub(ptr);\
397 x = (typeof(*ptr))lduw(ptr);\
400 x = (typeof(*ptr))ldl(ptr);\
403 x = (typeof(*ptr))ldq(ptr);\
412 #define __copy_to_user(dst, src, size)\
414 memcpy(dst, src, size);\
418 #define __copy_from_user(dst, src, size)\
420 memcpy(dst, src, size);\
424 #define __clear_user(dst, size)\
426 memset(dst, 0, size);\
431 #define offsetof(type, field) ((size_t) &((type *)0)->field)
434 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
435 const target_siginfo_t *info)
437 tswap_siginfo(tinfo, info);
443 /* from the Linux kernel */
445 struct target_fpreg {
446 uint16_t significand[4];
450 struct target_fpxreg {
451 uint16_t significand[4];
456 struct target_xmmreg {
457 target_ulong element[4];
460 struct target_fpstate {
461 /* Regular FPU environment */
467 target_ulong dataoff;
468 target_ulong datasel;
469 struct target_fpreg _st[8];
471 uint16_t magic; /* 0xffff = regular FPU data only */
473 /* FXSR FPU environment */
474 target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
476 target_ulong reserved;
477 struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
478 struct target_xmmreg _xmm[8];
479 target_ulong padding[56];
482 #define X86_FXSR_MAGIC 0x0000
484 struct target_sigcontext {
502 target_ulong esp_at_signal;
504 target_ulong fpstate; /* pointer */
505 target_ulong oldmask;
509 typedef struct target_sigaltstack {
512 target_ulong ss_size;
515 struct target_ucontext {
516 target_ulong uc_flags;
517 target_ulong uc_link;
518 target_stack_t uc_stack;
519 struct target_sigcontext uc_mcontext;
520 target_sigset_t uc_sigmask; /* mask last for extensibility */
525 target_ulong pretcode;
527 struct target_sigcontext sc;
528 struct target_fpstate fpstate;
529 target_ulong extramask[TARGET_NSIG_WORDS-1];
535 target_ulong pretcode;
539 struct target_siginfo info;
540 struct target_ucontext uc;
541 struct target_fpstate fpstate;
546 * Set up a signal frame.
549 /* XXX: save x87 state */
551 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
552 CPUX86State *env, unsigned long mask)
556 err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
557 err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
558 err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
559 err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
560 err |= __put_user(env->regs[R_EDI], &sc->edi);
561 err |= __put_user(env->regs[R_ESI], &sc->esi);
562 err |= __put_user(env->regs[R_EBP], &sc->ebp);
563 err |= __put_user(env->regs[R_ESP], &sc->esp);
564 err |= __put_user(env->regs[R_EBX], &sc->ebx);
565 err |= __put_user(env->regs[R_EDX], &sc->edx);
566 err |= __put_user(env->regs[R_ECX], &sc->ecx);
567 err |= __put_user(env->regs[R_EAX], &sc->eax);
568 err |= __put_user(env->exception_index, &sc->trapno);
569 err |= __put_user(env->error_code, &sc->err);
570 err |= __put_user(env->eip, &sc->eip);
571 err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
572 err |= __put_user(env->eflags, &sc->eflags);
573 err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
574 err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
576 cpu_x86_fsave(env, (void *)fpstate, 1);
577 fpstate->status = fpstate->sw;
578 err |= __put_user(0xffff, &fpstate->magic);
579 err |= __put_user(fpstate, &sc->fpstate);
581 /* non-iBCS2 extensions.. */
582 err |= __put_user(mask, &sc->oldmask);
583 err |= __put_user(env->cr[2], &sc->cr2);
588 * Determine which stack to use..
592 get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
596 /* Default to using normal stack */
597 esp = env->regs[R_ESP];
599 /* This is the X/Open sanctioned signal stack switching. */
600 if (ka->sa.sa_flags & SA_ONSTACK) {
601 if (sas_ss_flags(esp) == 0)
602 esp = current->sas_ss_sp + current->sas_ss_size;
605 /* This is the legacy signal stack switching. */
608 if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
609 !(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
610 ka->sa.sa_restorer) {
611 esp = (unsigned long) ka->sa.sa_restorer;
613 return (void *)((esp - frame_size) & -8ul);
616 static void setup_frame(int sig, struct emulated_sigaction *ka,
617 target_sigset_t *set, CPUX86State *env)
619 struct sigframe *frame;
622 frame = get_sigframe(ka, env, sizeof(*frame));
625 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
628 err |= __put_user((/*current->exec_domain
629 && current->exec_domain->signal_invmap
631 ? current->exec_domain->signal_invmap[sig]
637 setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
641 if (TARGET_NSIG_WORDS > 1) {
642 err |= __copy_to_user(frame->extramask, &set->sig[1],
643 sizeof(frame->extramask));
648 /* Set up to return from userspace. If provided, use a stub
649 already in userspace. */
650 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
651 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
653 err |= __put_user(frame->retcode, &frame->pretcode);
654 /* This is popl %eax ; movl $,%eax ; int $0x80 */
655 err |= __put_user(0xb858, (short *)(frame->retcode+0));
656 err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
657 err |= __put_user(0x80cd, (short *)(frame->retcode+6));
663 /* Set up registers for signal handler */
664 env->regs[R_ESP] = (unsigned long) frame;
665 env->eip = (unsigned long) ka->sa._sa_handler;
667 cpu_x86_load_seg(env, R_DS, __USER_DS);
668 cpu_x86_load_seg(env, R_ES, __USER_DS);
669 cpu_x86_load_seg(env, R_SS, __USER_DS);
670 cpu_x86_load_seg(env, R_CS, __USER_CS);
671 env->eflags &= ~TF_MASK;
676 if (sig == TARGET_SIGSEGV)
677 ka->sa._sa_handler = TARGET_SIG_DFL;
678 force_sig(TARGET_SIGSEGV /* , current */);
681 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
682 target_siginfo_t *info,
683 target_sigset_t *set, CPUX86State *env)
685 struct rt_sigframe *frame;
688 frame = get_sigframe(ka, env, sizeof(*frame));
691 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
695 err |= __put_user((/*current->exec_domain
696 && current->exec_domain->signal_invmap
698 ? current->exec_domain->signal_invmap[sig]
701 err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
702 err |= __put_user((target_ulong)&frame->uc, &frame->puc);
703 err |= copy_siginfo_to_user(&frame->info, info);
707 /* Create the ucontext. */
708 err |= __put_user(0, &frame->uc.uc_flags);
709 err |= __put_user(0, &frame->uc.uc_link);
710 err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
711 err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
712 &frame->uc.uc_stack.ss_flags);
713 err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
714 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
716 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
720 /* Set up to return from userspace. If provided, use a stub
721 already in userspace. */
722 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
723 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
725 err |= __put_user(frame->retcode, &frame->pretcode);
726 /* This is movl $,%eax ; int $0x80 */
727 err |= __put_user(0xb8, (char *)(frame->retcode+0));
728 err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
729 err |= __put_user(0x80cd, (short *)(frame->retcode+5));
735 /* Set up registers for signal handler */
736 env->regs[R_ESP] = (unsigned long) frame;
737 env->eip = (unsigned long) ka->sa._sa_handler;
739 cpu_x86_load_seg(env, R_DS, __USER_DS);
740 cpu_x86_load_seg(env, R_ES, __USER_DS);
741 cpu_x86_load_seg(env, R_SS, __USER_DS);
742 cpu_x86_load_seg(env, R_CS, __USER_CS);
743 env->eflags &= ~TF_MASK;
748 if (sig == TARGET_SIGSEGV)
749 ka->sa._sa_handler = TARGET_SIG_DFL;
750 force_sig(TARGET_SIGSEGV /* , current */);
754 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
756 unsigned int err = 0;
758 cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
759 cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
760 cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
761 cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
763 env->regs[R_EDI] = ldl(&sc->edi);
764 env->regs[R_ESI] = ldl(&sc->esi);
765 env->regs[R_EBP] = ldl(&sc->ebp);
766 env->regs[R_ESP] = ldl(&sc->esp);
767 env->regs[R_EBX] = ldl(&sc->ebx);
768 env->regs[R_EDX] = ldl(&sc->edx);
769 env->regs[R_ECX] = ldl(&sc->ecx);
770 env->eip = ldl(&sc->eip);
772 cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
773 cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
776 unsigned int tmpflags;
777 tmpflags = ldl(&sc->eflags);
778 env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
779 // regs->orig_eax = -1; /* disable syscall checks */
783 struct _fpstate * buf;
784 buf = (void *)ldl(&sc->fpstate);
787 if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
790 cpu_x86_frstor(env, (void *)buf, 1);
794 *peax = ldl(&sc->eax);
802 long do_sigreturn(CPUX86State *env)
804 struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
805 target_sigset_t target_set;
809 #if defined(DEBUG_SIGNAL)
810 fprintf(stderr, "do_sigreturn\n");
812 /* set blocked signals */
813 target_set.sig[0] = frame->sc.oldmask;
814 for(i = 1; i < TARGET_NSIG_WORDS; i++)
815 target_set.sig[i] = frame->extramask[i - 1];
817 target_to_host_sigset(&set, &target_set);
818 sigprocmask(SIG_SETMASK, &set, NULL);
820 /* restore registers */
821 if (restore_sigcontext(env, &frame->sc, &eax))
826 force_sig(TARGET_SIGSEGV);
830 long do_rt_sigreturn(CPUX86State *env)
832 struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4);
833 target_sigset_t target_set;
839 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
842 memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
844 target_to_host_sigset(&set, &target_set);
845 sigprocmask(SIG_SETMASK, &set, NULL);
847 if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
851 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
853 /* It is more difficult to avoid calling this function than to
854 call it and ignore errors. */
855 do_sigaltstack(&st, NULL, regs->esp);
860 force_sig(TARGET_SIGSEGV);
864 #elif defined(TARGET_ARM)
866 struct target_sigcontext {
867 target_ulong trap_no;
868 target_ulong error_code;
869 target_ulong oldmask;
880 target_ulong arm_r10;
886 target_ulong arm_cpsr;
887 target_ulong fault_address;
890 typedef struct target_sigaltstack {
893 target_ulong ss_size;
896 struct target_ucontext {
897 target_ulong uc_flags;
898 target_ulong uc_link;
899 target_stack_t uc_stack;
900 struct target_sigcontext uc_mcontext;
901 target_sigset_t uc_sigmask; /* mask last for extensibility */
906 struct target_sigcontext sc;
907 target_ulong extramask[TARGET_NSIG_WORDS-1];
908 target_ulong retcode;
913 struct target_siginfo *pinfo;
915 struct target_siginfo info;
916 struct target_ucontext uc;
917 target_ulong retcode;
920 #define TARGET_CONFIG_CPU_32 1
923 * For ARM syscalls, we encode the syscall number into the instruction.
925 #define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
926 #define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
929 * For Thumb syscalls, we pass the syscall number via r7. We therefore
930 * need two 16-bit instructions.
932 #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
933 #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
935 static const target_ulong retcodes[4] = {
936 SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
937 SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
941 #define __put_user_error(x,p,e) __put_user(x, p)
942 #define __get_user_error(x,p,e) __get_user(x, p)
944 static inline int valid_user_regs(CPUState *regs)
950 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
951 CPUState *env, unsigned long mask)
955 __put_user_error(env->regs[0], &sc->arm_r0, err);
956 __put_user_error(env->regs[1], &sc->arm_r1, err);
957 __put_user_error(env->regs[2], &sc->arm_r2, err);
958 __put_user_error(env->regs[3], &sc->arm_r3, err);
959 __put_user_error(env->regs[4], &sc->arm_r4, err);
960 __put_user_error(env->regs[5], &sc->arm_r5, err);
961 __put_user_error(env->regs[6], &sc->arm_r6, err);
962 __put_user_error(env->regs[7], &sc->arm_r7, err);
963 __put_user_error(env->regs[8], &sc->arm_r8, err);
964 __put_user_error(env->regs[9], &sc->arm_r9, err);
965 __put_user_error(env->regs[10], &sc->arm_r10, err);
966 __put_user_error(env->regs[11], &sc->arm_fp, err);
967 __put_user_error(env->regs[12], &sc->arm_ip, err);
968 __put_user_error(env->regs[13], &sc->arm_sp, err);
969 __put_user_error(env->regs[14], &sc->arm_lr, err);
970 __put_user_error(env->regs[15], &sc->arm_pc, err);
971 #ifdef TARGET_CONFIG_CPU_32
972 __put_user_error(env->cpsr, &sc->arm_cpsr, err);
975 __put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err);
976 __put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err);
977 __put_user_error(/* current->thread.address */ 0, &sc->fault_address, err);
978 __put_user_error(mask, &sc->oldmask, err);
984 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
986 unsigned long sp = regs->regs[13];
990 * This is the X/Open sanctioned signal stack switching.
992 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
993 sp = current->sas_ss_sp + current->sas_ss_size;
996 * ATPCS B01 mandates 8-byte alignment
998 return (void *)((sp - framesize) & ~7);
1002 setup_return(CPUState *env, struct emulated_sigaction *ka,
1003 target_ulong *rc, void *frame, int usig)
1005 target_ulong handler = (target_ulong)ka->sa._sa_handler;
1006 target_ulong retcode;
1008 #if defined(TARGET_CONFIG_CPU_32)
1009 target_ulong cpsr = env->cpsr;
1013 * Maybe we need to deliver a 32-bit signal to a 26-bit task.
1015 if (ka->sa.sa_flags & SA_THIRTYTWO)
1016 cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
1018 #ifdef CONFIG_ARM_THUMB
1019 if (elf_hwcap & HWCAP_THUMB) {
1021 * The LSB of the handler determines if we're going to
1022 * be using THUMB or ARM mode for this signal handler.
1024 thumb = handler & 1;
1033 #endif /* TARGET_CONFIG_CPU_32 */
1035 if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
1036 retcode = (target_ulong)ka->sa.sa_restorer;
1038 unsigned int idx = thumb;
1040 if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
1043 if (__put_user(retcodes[idx], rc))
1046 flush_icache_range((target_ulong)rc,
1047 (target_ulong)(rc + 1));
1049 retcode = ((target_ulong)rc) + thumb;
1052 env->regs[0] = usig;
1053 env->regs[13] = (target_ulong)frame;
1054 env->regs[14] = retcode;
1055 env->regs[15] = handler & (thumb ? ~1 : ~3);
1057 #ifdef TARGET_CONFIG_CPU_32
1064 static void setup_frame(int usig, struct emulated_sigaction *ka,
1065 target_sigset_t *set, CPUState *regs)
1067 struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
1070 err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
1072 if (TARGET_NSIG_WORDS > 1) {
1073 err |= __copy_to_user(frame->extramask, &set->sig[1],
1074 sizeof(frame->extramask));
1078 err = setup_return(regs, ka, &frame->retcode, frame, usig);
1082 static void setup_rt_frame(int usig, struct emulated_sigaction *ka,
1083 target_siginfo_t *info,
1084 target_sigset_t *set, CPUState *env)
1086 struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame));
1090 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
1093 __put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err);
1094 __put_user_error(&frame->uc, (target_ulong *)&frame->puc, err);
1095 err |= copy_siginfo_to_user(&frame->info, info);
1097 /* Clear all the bits of the ucontext we don't use. */
1098 err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
1100 err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
1102 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
1105 err = setup_return(env, ka, &frame->retcode, frame, usig);
1109 * For realtime signals we must also set the second and third
1110 * arguments for the signal handler.
1111 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
1113 env->regs[1] = (target_ulong)frame->pinfo;
1114 env->regs[2] = (target_ulong)frame->puc;
1121 restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
1125 __get_user_error(env->regs[0], &sc->arm_r0, err);
1126 __get_user_error(env->regs[1], &sc->arm_r1, err);
1127 __get_user_error(env->regs[2], &sc->arm_r2, err);
1128 __get_user_error(env->regs[3], &sc->arm_r3, err);
1129 __get_user_error(env->regs[4], &sc->arm_r4, err);
1130 __get_user_error(env->regs[5], &sc->arm_r5, err);
1131 __get_user_error(env->regs[6], &sc->arm_r6, err);
1132 __get_user_error(env->regs[7], &sc->arm_r7, err);
1133 __get_user_error(env->regs[8], &sc->arm_r8, err);
1134 __get_user_error(env->regs[9], &sc->arm_r9, err);
1135 __get_user_error(env->regs[10], &sc->arm_r10, err);
1136 __get_user_error(env->regs[11], &sc->arm_fp, err);
1137 __get_user_error(env->regs[12], &sc->arm_ip, err);
1138 __get_user_error(env->regs[13], &sc->arm_sp, err);
1139 __get_user_error(env->regs[14], &sc->arm_lr, err);
1140 __get_user_error(env->regs[15], &sc->arm_pc, err);
1141 #ifdef TARGET_CONFIG_CPU_32
1142 __get_user_error(env->cpsr, &sc->arm_cpsr, err);
1145 err |= !valid_user_regs(env);
1150 long do_sigreturn(CPUState *env)
1152 struct sigframe *frame;
1153 target_sigset_t set;
1157 * Since we stacked the signal on a 64-bit boundary,
1158 * then 'sp' should be word aligned here. If it's
1159 * not, then the user is trying to mess with us.
1161 if (env->regs[13] & 7)
1164 frame = (struct sigframe *)env->regs[13];
1167 if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1170 if (__get_user(set.sig[0], &frame->sc.oldmask)
1171 || (TARGET_NSIG_WORDS > 1
1172 && __copy_from_user(&set.sig[1], &frame->extramask,
1173 sizeof(frame->extramask))))
1176 target_to_host_sigset(&host_set, &set);
1177 sigprocmask(SIG_SETMASK, &host_set, NULL);
1179 if (restore_sigcontext(env, &frame->sc))
1183 /* Send SIGTRAP if we're single-stepping */
1184 if (ptrace_cancel_bpt(current))
1185 send_sig(SIGTRAP, current, 1);
1187 return env->regs[0];
1190 force_sig(SIGSEGV /* , current */);
1194 long do_rt_sigreturn(CPUState *env)
1196 struct rt_sigframe *frame;
1197 target_sigset_t set;
1201 * Since we stacked the signal on a 64-bit boundary,
1202 * then 'sp' should be word aligned here. If it's
1203 * not, then the user is trying to mess with us.
1205 if (env->regs[13] & 7)
1208 frame = (struct rt_sigframe *)env->regs[13];
1211 if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
1214 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
1217 target_to_host_sigset(&host_set, &set);
1218 sigprocmask(SIG_SETMASK, &host_set, NULL);
1220 if (restore_sigcontext(env, &frame->uc.uc_mcontext))
1224 /* Send SIGTRAP if we're single-stepping */
1225 if (ptrace_cancel_bpt(current))
1226 send_sig(SIGTRAP, current, 1);
1228 return env->regs[0];
1231 force_sig(SIGSEGV /* , current */);
1237 static void setup_frame(int sig, struct emulated_sigaction *ka,
1238 target_sigset_t *set, CPUState *env)
1240 fprintf(stderr, "setup_frame: not implemented\n");
1243 static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
1244 target_siginfo_t *info,
1245 target_sigset_t *set, CPUState *env)
1247 fprintf(stderr, "setup_rt_frame: not implemented\n");
1250 long do_sigreturn(CPUState *env)
1252 fprintf(stderr, "do_sigreturn: not implemented\n");
1256 long do_rt_sigreturn(CPUState *env)
1258 fprintf(stderr, "do_rt_sigreturn: not implemented\n");
1264 void process_pending_signals(void *cpu_env)
1267 target_ulong handler;
1268 sigset_t set, old_set;
1269 target_sigset_t target_old_set;
1270 struct emulated_sigaction *k;
1273 if (!signal_pending)
1277 for(sig = 1; sig <= TARGET_NSIG; sig++) {
1282 /* if no signal is pending, just return */
1288 fprintf(stderr, "qemu: process signal %d\n", sig);
1290 /* dequeue signal */
1296 handler = k->sa._sa_handler;
1297 if (handler == TARGET_SIG_DFL) {
1298 /* default handler : ignore some signal. The other are fatal */
1299 if (sig != TARGET_SIGCHLD &&
1300 sig != TARGET_SIGURG &&
1301 sig != TARGET_SIGWINCH) {
1304 } else if (handler == TARGET_SIG_IGN) {
1306 } else if (handler == TARGET_SIG_ERR) {
1309 /* compute the blocked signals during the handler execution */
1310 target_to_host_sigset(&set, &k->sa.sa_mask);
1311 /* SA_NODEFER indicates that the current signal should not be
1312 blocked during the handler */
1313 if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
1314 sigaddset(&set, target_to_host_signal(sig));
1316 /* block signals in the handler using Linux */
1317 sigprocmask(SIG_BLOCK, &set, &old_set);
1318 /* save the previous blocked signal state to restore it at the
1319 end of the signal execution (see do_sigreturn) */
1320 host_to_target_sigset(&target_old_set, &old_set);
1322 /* if the CPU is in VM86 mode, we restore the 32 bit values */
1325 CPUX86State *env = cpu_env;
1326 if (env->eflags & VM_MASK)
1327 save_v86_state(env);
1330 /* prepare the stack frame of the virtual CPU */
1331 if (k->sa.sa_flags & TARGET_SA_SIGINFO)
1332 setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
1334 setup_frame(sig, k, &target_old_set, cpu_env);
1335 if (k->sa.sa_flags & TARGET_SA_RESETHAND)
1336 k->sa._sa_handler = TARGET_SIG_DFL;