[qemu.git] / darwin-user / signal.c

/*
 *  Emulation of Linux signals
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ucontext.h>

#ifdef __ia64__
#undef uc_mcontext
#undef uc_sigmask
#undef uc_stack
#undef uc_link
#endif

#include "qemu.h"
#include "qemu-common.h"

#define DEBUG_SIGNAL

#define MAX_SIGQUEUE_SIZE 1024

struct sigqueue {
    struct sigqueue *next;
    target_siginfo_t info;
};

struct emulated_sigaction {
    struct target_sigaction sa;
    int pending; /* true if signal is pending */
    struct sigqueue *first;
    struct sigqueue info; /* in order to always have memory for the
                             first signal, we put it here */
};

static struct sigaltstack target_sigaltstack_used = {
    0, 0, SA_DISABLE
};

static struct emulated_sigaction sigact_table[NSIG];
static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
static struct sigqueue *first_free; /* first free siginfo queue entry */
static int signal_pending; /* non zero if a signal may be pending */

static void host_signal_handler(int host_signum, siginfo_t *info,
                                void *puc);


static inline int host_to_target_signal(int sig)
{
    return sig;
}

static inline int target_to_host_signal(int sig)
{
    return sig;
}

/* siginfo conversion */


void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
{

}

void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
{

}

void signal_init(void)
{
    struct sigaction act;
    int i;

    /* set all host signal handlers. ALL signals are blocked during
       the handlers to serialize them. */
    sigfillset(&act.sa_mask);
    act.sa_flags = SA_SIGINFO;
    act.sa_sigaction = host_signal_handler;
    for(i = 1; i < NSIG; i++) {
        sigaction(i, &act, NULL);
    }

    memset(sigact_table, 0, sizeof(sigact_table));

    first_free = &sigqueue_table[0];
    for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
        sigqueue_table[i].next = &sigqueue_table[i + 1];
    sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
}

/* signal queue handling */

static inline struct sigqueue *alloc_sigqueue(void)
{
    struct sigqueue *q = first_free;
    if (!q)
        return NULL;
    first_free = q->next;
    return q;
}

static inline void free_sigqueue(struct sigqueue *q)
{
    q->next = first_free;
    first_free = q;
}

/* abort execution with signal */
void QEMU_NORETURN force_sig(int sig)
{
    int host_sig;
    host_sig = target_to_host_signal(sig);
    fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
            sig, strsignal(host_sig));
    _exit(-host_sig);
}

/* queue a signal so that it will be send to the virtual CPU as soon
   as possible */
int queue_signal(int sig, target_siginfo_t *info)
{
    struct emulated_sigaction *k;
    struct sigqueue *q, **pq;
    target_ulong handler;

#if defined(DEBUG_SIGNAL)
    fprintf(stderr, "queue_signal: sig=%d\n",
            sig);
#endif
    k = &sigact_table[sig - 1];
    handler = (target_ulong)k->sa.sa_handler;
    if (handler == SIG_DFL) {
        /* default handler : ignore some signal. The other are fatal */
        if (sig != SIGCHLD &&
            sig != SIGURG &&
            sig != SIGWINCH) {
            force_sig(sig);
        } else {
            return 0; /* indicate ignored */
        }
    } else if (handler == host_to_target_signal(SIG_IGN)) {
        /* ignore signal */
        return 0;
    } else if (handler == host_to_target_signal(SIG_ERR)) {
        force_sig(sig);
    } else {
        pq = &k->first;
        if (!k->pending) {
            /* first signal */
            q = &k->info;
        } else {
            q = alloc_sigqueue();
            if (!q)
                return -EAGAIN;
            while (*pq != NULL)
                pq = &(*pq)->next;
        }
        *pq = q;
        q->info = *info;
        q->next = NULL;
        k->pending = 1;
        /* signal that a new signal is pending */
        signal_pending = 1;
        return 1; /* indicates that the signal was queued */
    }
}

static void host_signal_handler(int host_signum, siginfo_t *info,
                                void *puc)
{
    int sig;
    target_siginfo_t tinfo;

    /* the CPU emulator uses some host signals to detect exceptions,
       we we forward to it some signals */
    if (host_signum == SIGSEGV || host_signum == SIGBUS) {
        if (cpu_signal_handler(host_signum, (void*)info, puc))
            return;
    }

    /* get target signal number */
    sig = host_to_target_signal(host_signum);
    if (sig < 1 || sig > NSIG)
        return;

#if defined(DEBUG_SIGNAL)
	fprintf(stderr, "qemu: got signal %d\n", sig);
#endif
    if (queue_signal(sig, &tinfo) == 1) {
        /* interrupt the virtual CPU as soon as possible */
        cpu_exit(global_env);
    }
}

int do_sigaltstack(const struct sigaltstack *ss, struct sigaltstack *oss)
{
    /* XXX: test errors */
    if(oss)
    {
        oss->ss_sp = tswap32(target_sigaltstack_used.ss_sp);
        oss->ss_size = tswap32(target_sigaltstack_used.ss_size);
        oss->ss_flags = tswap32(target_sigaltstack_used.ss_flags);
    }
    if(ss)
    {
        target_sigaltstack_used.ss_sp = tswap32(ss->ss_sp);
        target_sigaltstack_used.ss_size = tswap32(ss->ss_size);
        target_sigaltstack_used.ss_flags = tswap32(ss->ss_flags);
    }
    return 0;
}

int do_sigaction(int sig, const struct sigaction *act,
                 struct sigaction *oact)
{
    struct emulated_sigaction *k;
    struct sigaction act1;
    int host_sig;

    if (sig < 1 || sig > NSIG)
        return -EINVAL;

    k = &sigact_table[sig - 1];
#if defined(DEBUG_SIGNAL)
    fprintf(stderr, "sigaction 1 sig=%d act=0x%08x, oact=0x%08x\n",
            sig, (int)act, (int)oact);
#endif
    if (oact) {
#if defined(DEBUG_SIGNAL)
    fprintf(stderr, "sigaction 1 sig=%d act=0x%08x, oact=0x%08x\n",
            sig, (int)act, (int)oact);
#endif

        oact->sa_handler = tswapl(k->sa.sa_handler);
        oact->sa_flags = tswapl(k->sa.sa_flags);
        oact->sa_mask = tswapl(k->sa.sa_mask);
    }
    if (act) {
#if defined(DEBUG_SIGNAL)
    fprintf(stderr, "sigaction handler 0x%x flag 0x%x mask 0x%x\n",
            act->sa_handler, act->sa_flags, act->sa_mask);
#endif

        k->sa.sa_handler = tswapl(act->sa_handler);
        k->sa.sa_flags = tswapl(act->sa_flags);
        k->sa.sa_mask = tswapl(act->sa_mask);
        /* we update the host signal state */
        host_sig = target_to_host_signal(sig);
        if (host_sig != SIGSEGV && host_sig != SIGBUS) {
#if defined(DEBUG_SIGNAL)
            fprintf(stderr, "sigaction handler going to call sigaction\n");
#endif

            sigfillset(&act1.sa_mask);
            act1.sa_flags = SA_SIGINFO;
            if (k->sa.sa_flags & SA_RESTART)
                act1.sa_flags |= SA_RESTART;
            /* NOTE: it is important to update the host kernel signal
               ignore state to avoid getting unexpected interrupted
               syscalls */
            if (k->sa.sa_handler == SIG_IGN) {
                act1.sa_sigaction = (void *)SIG_IGN;
            } else if (k->sa.sa_handler == SIG_DFL) {
                act1.sa_sigaction = (void *)SIG_DFL;
            } else {
                act1.sa_sigaction = host_signal_handler;
            }
            sigaction(host_sig, &act1, NULL);
        }
    }
    return 0;
}


#ifdef TARGET_I386

static inline void *
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
{
    /* XXX Fix that */
    if(target_sigaltstack_used.ss_flags & SA_DISABLE)
    {
        int esp;
        /* Default to using normal stack */
        esp = env->regs[R_ESP];

        return (void *)((esp - frame_size) & -8ul);
    }
    else
    {
        return target_sigaltstack_used.ss_sp;
    }
}

static void setup_frame(int sig, struct emulated_sigaction *ka,
                        void *set, CPUX86State *env)
{
	void *frame;

    fprintf(stderr, "setup_frame %d\n", sig);
	frame = get_sigframe(ka, env, sizeof(*frame));

	/* Set up registers for signal handler */
	env->regs[R_ESP] = (unsigned long) frame;
	env->eip = (unsigned long) ka->sa.sa_handler;

	env->eflags &= ~TF_MASK;

	return;

give_sigsegv:
	if (sig == SIGSEGV)
		ka->sa.sa_handler = SIG_DFL;
	force_sig(SIGSEGV /* , current */);
}

long do_sigreturn(CPUX86State *env, int num)
{
    int i = 0;
    struct target_sigcontext *scp = get_int_arg(&i, env);
    /* XXX Get current signal number */
    /* XXX Adjust accordin to sc_onstack, sc_mask */
    if(tswapl(scp->sc_onstack) & 0x1)
        target_sigaltstack_used.ss_flags |= ~SA_DISABLE;
    else
        target_sigaltstack_used.ss_flags &=  SA_DISABLE;
    int set = tswapl(scp->sc_eax);
    sigprocmask(SIG_SETMASK, &set, NULL);

    fprintf(stderr, "do_sigreturn: partially implemented %x EAX:%x EBX:%x\n", scp->sc_mask, tswapl(scp->sc_eax), tswapl(scp->sc_ebx));
    fprintf(stderr, "ECX:%x EDX:%x EDI:%x\n", scp->sc_ecx, tswapl(scp->sc_edx), tswapl(scp->sc_edi));
    fprintf(stderr, "EIP:%x\n", tswapl(scp->sc_eip));

    env->regs[R_EAX] = tswapl(scp->sc_eax);
    env->regs[R_EBX] = tswapl(scp->sc_ebx);
    env->regs[R_ECX] = tswapl(scp->sc_ecx);
    env->regs[R_EDX] = tswapl(scp->sc_edx);
    env->regs[R_EDI] = tswapl(scp->sc_edi);
    env->regs[R_ESI] = tswapl(scp->sc_esi);
    env->regs[R_EBP] = tswapl(scp->sc_ebp);
    env->regs[R_ESP] = tswapl(scp->sc_esp);
    env->segs[R_SS].selector = (void*)tswapl(scp->sc_ss);
    env->eflags = tswapl(scp->sc_eflags);
    env->eip = tswapl(scp->sc_eip);
    env->segs[R_CS].selector = (void*)tswapl(scp->sc_cs);
    env->segs[R_DS].selector = (void*)tswapl(scp->sc_ds);
    env->segs[R_ES].selector = (void*)tswapl(scp->sc_es);
    env->segs[R_FS].selector = (void*)tswapl(scp->sc_fs);
    env->segs[R_GS].selector = (void*)tswapl(scp->sc_gs);

    /* Again, because our caller's caller will reset EAX */
    return env->regs[R_EAX];
}

#else

static void setup_frame(int sig, struct emulated_sigaction *ka,
			void *set, CPUArchState *env)
{
    fprintf(stderr, "setup_frame: not implemented\n");
}

long do_sigreturn(CPUArchState *env, int num)
{
    int i = 0;
    struct target_sigcontext *scp = get_int_arg(&i, env);
    fprintf(stderr, "do_sigreturn: not implemented\n");
    return -ENOSYS;
}

#endif

void process_pending_signals(void *cpu_env)
{
    struct emulated_sigaction *k;
    struct sigqueue *q;
    target_ulong handler;
    int sig;

    if (!signal_pending)
        return;

    k = sigact_table;

    for(sig = 1; sig <= NSIG; sig++) {
        if (k->pending)
            goto handle_signal;
        k++;
    }

    /* if no signal is pending, just return */
    signal_pending = 0;
    return;
handle_signal:
    #ifdef DEBUG_SIGNAL
    fprintf(stderr, "qemu: process signal %d\n", sig);
    #endif
    /* dequeue signal */
    q = k->first;
    k->first = q->next;
    if (!k->first)
        k->pending = 0;

    sig = gdb_handlesig (cpu_env, sig);
    if (!sig) {
        fprintf (stderr, "Lost signal\n");
        abort();
    }

    handler = k->sa.sa_handler;
    if (handler == SIG_DFL) {
        /* default handler : ignore some signal. The other are fatal */
        if (sig != SIGCHLD &&
            sig != SIGURG &&
            sig != SIGWINCH) {
            force_sig(sig);
        }
    } else if (handler == SIG_IGN) {
        /* ignore sig */
    } else if (handler == SIG_ERR) {
        force_sig(sig);
    } else {

        setup_frame(sig, k, 0, cpu_env);
	if (k->sa.sa_flags & SA_RESETHAND)
            k->sa.sa_handler = SIG_DFL;
    }
    if (q != &k->info)
        free_sigqueue(q);
}
Commit	Line	Data
831b7825 TS	1	/*
	2	* Emulation of Linux signals
	3	*
	4	* Copyright (c) 2003 Fabrice Bellard
	5	*
	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.
	10	*
	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.
	15	*
	16	* You should have received a copy of the GNU General Public License
8167ee88	17	* along with this program; if not, see <http://www.gnu.org/licenses/>.
831b7825 TS	18	*/
	19	#include <stdlib.h>
	20	#include <stdio.h>
	21	#include <string.h>
	22	#include <stdarg.h>
	23	#include <unistd.h>
831b7825 TS	24	#include <errno.h>
	25	#include <sys/ucontext.h>
	26
	27	#ifdef __ia64__
	28	#undef uc_mcontext
	29	#undef uc_sigmask
	30	#undef uc_stack
	31	#undef uc_link
	32	#endif
	33
831b7825	34	#include "qemu.h"
7d99a001	35	#include "qemu-common.h"
831b7825 TS	36
	37	#define DEBUG_SIGNAL
	38
	39	#define MAX_SIGQUEUE_SIZE 1024
	40
	41	struct sigqueue {
	42	struct sigqueue *next;
	43	target_siginfo_t info;
	44	};
	45
	46	struct emulated_sigaction {
	47	struct target_sigaction sa;
	48	int pending; /* true if signal is pending */
	49	struct sigqueue *first;
	50	struct sigqueue info; /* in order to always have memory for the
	51	first signal, we put it here */
	52	};
	53
249c4c32	54	static struct sigaltstack target_sigaltstack_used = {
831b7825 TS	55	0, 0, SA_DISABLE
	56	};
	57
	58	static struct emulated_sigaction sigact_table[NSIG];
	59	static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
	60	static struct sigqueue first_free; / first free siginfo queue entry */
	61	static int signal_pending; /* non zero if a signal may be pending */
	62
	63	static void host_signal_handler(int host_signum, siginfo_t *info,
	64	void *puc);
	65
	66
	67	static inline int host_to_target_signal(int sig)
	68	{
	69	return sig;
	70	}
	71
	72	static inline int target_to_host_signal(int sig)
	73	{
	74	return sig;
	75	}
	76
	77	/* siginfo conversion */
	78
	79
	80
	81	void host_to_target_siginfo(target_siginfo_t tinfo, const siginfo_t info)
	82	{
	83
	84	}
	85
	86	void target_to_host_siginfo(siginfo_t info, const target_siginfo_t tinfo)
	87	{
	88
	89	}
	90
	91	void signal_init(void)
	92	{
	93	struct sigaction act;
	94	int i;
	95
	96	/* set all host signal handlers. ALL signals are blocked during
	97	the handlers to serialize them. */
	98	sigfillset(&act.sa_mask);
	99	act.sa_flags = SA_SIGINFO;
	100	act.sa_sigaction = host_signal_handler;
	101	for(i = 1; i < NSIG; i++) {
	102	sigaction(i, &act, NULL);
	103	}
	104
	105	memset(sigact_table, 0, sizeof(sigact_table));
	106
	107	first_free = &sigqueue_table[0];
	108	for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
	109	sigqueue_table[i].next = &sigqueue_table[i + 1];
	110	sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
	111	}
	112
	113	/* signal queue handling */
	114
	115	static inline struct sigqueue *alloc_sigqueue(void)
	116	{
	117	struct sigqueue *q = first_free;
	118	if (!q)
119	return NULL;
120	first_free = q->next;
121	return q;
122	}
123
124	static inline void free_sigqueue(struct sigqueue *q)
125	{
126	q->next = first_free;
127	first_free = q;
128	}
129
130	/* abort execution with signal */
a5e50b26	131	void QEMU_NORETURN force_sig(int sig)
831b7825 TS	132	{
	133	int host_sig;
	134	host_sig = target_to_host_signal(sig);
	135	fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
	136	sig, strsignal(host_sig));
	137	_exit(-host_sig);
	138	}
	139
	140	/* queue a signal so that it will be send to the virtual CPU as soon
	141	as possible */
	142	int queue_signal(int sig, target_siginfo_t *info)
	143	{
	144	struct emulated_sigaction *k;
	145	struct sigqueue q, *pq;
	146	target_ulong handler;
	147
	148	#if defined(DEBUG_SIGNAL)
	149	fprintf(stderr, "queue_signal: sig=%d\n",
	150	sig);
	151	#endif
	152	k = &sigact_table[sig - 1];
	153	handler = (target_ulong)k->sa.sa_handler;
	154	if (handler == SIG_DFL) {
	155	/* default handler : ignore some signal. The other are fatal */
	156	if (sig != SIGCHLD &&
	157	sig != SIGURG &&
	158	sig != SIGWINCH) {
	159	force_sig(sig);
	160	} else {
	161	return 0; /* indicate ignored */
	162	}
	163	} else if (handler == host_to_target_signal(SIG_IGN)) {
	164	/* ignore signal */
	165	return 0;
	166	} else if (handler == host_to_target_signal(SIG_ERR)) {
	167	force_sig(sig);
	168	} else {
	169	pq = &k->first;
	170	if (!k->pending) {
	171	/* first signal */
	172	q = &k->info;
	173	} else {
	174	q = alloc_sigqueue();
	175	if (!q)
	176	return -EAGAIN;
	177	while (*pq != NULL)
	178	pq = &(*pq)->next;
	179	}
	180	*pq = q;
	181	q->info = *info;
	182	q->next = NULL;
	183	k->pending = 1;
	184	/* signal that a new signal is pending */
	185	signal_pending = 1;
	186	return 1; /* indicates that the signal was queued */
	187	}
	188	}
	189
	190	static void host_signal_handler(int host_signum, siginfo_t *info,
	191	void *puc)
	192	{
	193	int sig;
	194	target_siginfo_t tinfo;
	195
196	/* the CPU emulator uses some host signals to detect exceptions,
197	we we forward to it some signals */
ec6338ba	198	if (host_signum == SIGSEGV \|\| host_signum == SIGBUS) {
831b7825 TS	199	if (cpu_signal_handler(host_signum, (void*)info, puc))
	200	return;
	201	}
	202
	203	/* get target signal number */
	204	sig = host_to_target_signal(host_signum);
	205	if (sig < 1 \|\| sig > NSIG)
	206	return;
	207
	208	#if defined(DEBUG_SIGNAL)
	209	fprintf(stderr, "qemu: got signal %d\n", sig);
	210	#endif
	211	if (queue_signal(sig, &tinfo) == 1) {
	212	/* interrupt the virtual CPU as soon as possible */
3098dba0	213	cpu_exit(global_env);
831b7825 TS	214	}
	215	}
	216
	217	int do_sigaltstack(const struct sigaltstack ss, struct sigaltstack oss)
	218	{
	219	/* XXX: test errors */
	220	if(oss)
	221	{
	222	oss->ss_sp = tswap32(target_sigaltstack_used.ss_sp);
	223	oss->ss_size = tswap32(target_sigaltstack_used.ss_size);
	224	oss->ss_flags = tswap32(target_sigaltstack_used.ss_flags);
	225	}
	226	if(ss)
	227	{
	228	target_sigaltstack_used.ss_sp = tswap32(ss->ss_sp);
	229	target_sigaltstack_used.ss_size = tswap32(ss->ss_size);
	230	target_sigaltstack_used.ss_flags = tswap32(ss->ss_flags);
	231	}
	232	return 0;
	233	}
	234
	235	int do_sigaction(int sig, const struct sigaction *act,
	236	struct sigaction *oact)
	237	{
	238	struct emulated_sigaction *k;
	239	struct sigaction act1;
	240	int host_sig;
	241
	242	if (sig < 1 \|\| sig > NSIG)
	243	return -EINVAL;
	244
	245	k = &sigact_table[sig - 1];
	246	#if defined(DEBUG_SIGNAL)
	247	fprintf(stderr, "sigaction 1 sig=%d act=0x%08x, oact=0x%08x\n",
	248	sig, (int)act, (int)oact);
	249	#endif
	250	if (oact) {
	251	#if defined(DEBUG_SIGNAL)
	252	fprintf(stderr, "sigaction 1 sig=%d act=0x%08x, oact=0x%08x\n",
	253	sig, (int)act, (int)oact);
	254	#endif
	255
	256	oact->sa_handler = tswapl(k->sa.sa_handler);
	257	oact->sa_flags = tswapl(k->sa.sa_flags);
	258	oact->sa_mask = tswapl(k->sa.sa_mask);
	259	}
	260	if (act) {
	261	#if defined(DEBUG_SIGNAL)
	262	fprintf(stderr, "sigaction handler 0x%x flag 0x%x mask 0x%x\n",
	263	act->sa_handler, act->sa_flags, act->sa_mask);
	264	#endif
	265
	266	k->sa.sa_handler = tswapl(act->sa_handler);
	267	k->sa.sa_flags = tswapl(act->sa_flags);
	268	k->sa.sa_mask = tswapl(act->sa_mask);
	269	/* we update the host signal state */
	270	host_sig = target_to_host_signal(sig);
	271	if (host_sig != SIGSEGV && host_sig != SIGBUS) {
	272	#if defined(DEBUG_SIGNAL)
7a4bbe8d	273	fprintf(stderr, "sigaction handler going to call sigaction\n");
831b7825 TS	274	#endif
	275
	276	sigfillset(&act1.sa_mask);
	277	act1.sa_flags = SA_SIGINFO;
	278	if (k->sa.sa_flags & SA_RESTART)
	279	act1.sa_flags \|= SA_RESTART;
	280	/* NOTE: it is important to update the host kernel signal
	281	ignore state to avoid getting unexpected interrupted
	282	syscalls */
	283	if (k->sa.sa_handler == SIG_IGN) {
	284	act1.sa_sigaction = (void *)SIG_IGN;
	285	} else if (k->sa.sa_handler == SIG_DFL) {
	286	act1.sa_sigaction = (void *)SIG_DFL;
	287	} else {
	288	act1.sa_sigaction = host_signal_handler;
	289	}
	290	sigaction(host_sig, &act1, NULL);
	291	}
	292	}
	293	return 0;
	294	}
	295
	296
	297	#ifdef TARGET_I386
	298
	299	static inline void *
	300	get_sigframe(struct emulated_sigaction ka, CPUX86State env, size_t frame_size)
	301	{
	302	/* XXX Fix that */
	303	if(target_sigaltstack_used.ss_flags & SA_DISABLE)
	304	{
	305	int esp;
	306	/* Default to using normal stack */
	307	esp = env->regs[R_ESP];
	308
	309	return (void *)((esp - frame_size) & -8ul);
	310	}
	311	else
	312	{
	313	return target_sigaltstack_used.ss_sp;
	314	}
	315	}
	316
	317	static void setup_frame(int sig, struct emulated_sigaction *ka,
c91dcf0b	318	void set, CPUX86State env)
831b7825 TS	319	{
831b7825 TS	320	void *frame;
831b7825 TS	321
	322	fprintf(stderr, "setup_frame %d\n", sig);
	323	frame = get_sigframe(ka, env, sizeof(*frame));
	324
	325	/* Set up registers for signal handler */
	326	env->regs[R_ESP] = (unsigned long) frame;
	327	env->eip = (unsigned long) ka->sa.sa_handler;
	328
	329	env->eflags &= ~TF_MASK;
	330
	331	return;
	332
	333	give_sigsegv:
	334	if (sig == SIGSEGV)
	335	ka->sa.sa_handler = SIG_DFL;
	336	force_sig(SIGSEGV /* , current */);
	337	}
	338
c91dcf0b	339	long do_sigreturn(CPUX86State *env, int num)
831b7825 TS	340	{
	341	int i = 0;
	342	struct target_sigcontext *scp = get_int_arg(&i, env);
	343	/* XXX Get current signal number */
	344	/* XXX Adjust accordin to sc_onstack, sc_mask */
	345	if(tswapl(scp->sc_onstack) & 0x1)
	346	target_sigaltstack_used.ss_flags \|= ~SA_DISABLE;
	347	else
	348	target_sigaltstack_used.ss_flags &= SA_DISABLE;
	349	int set = tswapl(scp->sc_eax);
	350	sigprocmask(SIG_SETMASK, &set, NULL);
	351
	352	fprintf(stderr, "do_sigreturn: partially implemented %x EAX:%x EBX:%x\n", scp->sc_mask, tswapl(scp->sc_eax), tswapl(scp->sc_ebx));
	353	fprintf(stderr, "ECX:%x EDX:%x EDI:%x\n", scp->sc_ecx, tswapl(scp->sc_edx), tswapl(scp->sc_edi));
	354	fprintf(stderr, "EIP:%x\n", tswapl(scp->sc_eip));
	355
	356	env->regs[R_EAX] = tswapl(scp->sc_eax);
	357	env->regs[R_EBX] = tswapl(scp->sc_ebx);
	358	env->regs[R_ECX] = tswapl(scp->sc_ecx);
	359	env->regs[R_EDX] = tswapl(scp->sc_edx);
	360	env->regs[R_EDI] = tswapl(scp->sc_edi);
	361	env->regs[R_ESI] = tswapl(scp->sc_esi);
	362	env->regs[R_EBP] = tswapl(scp->sc_ebp);
	363	env->regs[R_ESP] = tswapl(scp->sc_esp);
	364	env->segs[R_SS].selector = (void*)tswapl(scp->sc_ss);
	365	env->eflags = tswapl(scp->sc_eflags);
	366	env->eip = tswapl(scp->sc_eip);
	367	env->segs[R_CS].selector = (void*)tswapl(scp->sc_cs);
	368	env->segs[R_DS].selector = (void*)tswapl(scp->sc_ds);
	369	env->segs[R_ES].selector = (void*)tswapl(scp->sc_es);
	370	env->segs[R_FS].selector = (void*)tswapl(scp->sc_fs);
	371	env->segs[R_GS].selector = (void*)tswapl(scp->sc_gs);
	372
	373	/* Again, because our caller's caller will reset EAX */
	374	return env->regs[R_EAX];
	375	}
	376
	377	#else
	378
	379	static void setup_frame(int sig, struct emulated_sigaction *ka,
9349b4f9	380	void set, CPUArchState env)
831b7825 TS	381	{
	382	fprintf(stderr, "setup_frame: not implemented\n");
	383	}
	384
9349b4f9	385	long do_sigreturn(CPUArchState *env, int num)
831b7825 TS	386	{
	387	int i = 0;
	388	struct target_sigcontext *scp = get_int_arg(&i, env);
	389	fprintf(stderr, "do_sigreturn: not implemented\n");
	390	return -ENOSYS;
	391	}
	392
	393	#endif
	394
	395	void process_pending_signals(void *cpu_env)
	396	{
	397	struct emulated_sigaction *k;
	398	struct sigqueue *q;
	399	target_ulong handler;
	400	int sig;
	401
	402	if (!signal_pending)
	403	return;
	404
	405	k = sigact_table;
	406
	407	for(sig = 1; sig <= NSIG; sig++) {
	408	if (k->pending)
	409	goto handle_signal;
	410	k++;
	411	}
	412
	413	/* if no signal is pending, just return */
	414	signal_pending = 0;
	415	return;
	416	handle_signal:
	417	#ifdef DEBUG_SIGNAL
	418	fprintf(stderr, "qemu: process signal %d\n", sig);
	419	#endif
	420	/* dequeue signal */
	421	q = k->first;
	422	k->first = q->next;
	423	if (!k->first)
	424	k->pending = 0;
	425
	426	sig = gdb_handlesig (cpu_env, sig);
	427	if (!sig) {
	428	fprintf (stderr, "Lost signal\n");
	429	abort();
	430	}
	431
	432	handler = k->sa.sa_handler;
	433	if (handler == SIG_DFL) {
	434	/* default handler : ignore some signal. The other are fatal */
	435	if (sig != SIGCHLD &&
	436	sig != SIGURG &&
	437	sig != SIGWINCH) {
	438	force_sig(sig);
	439	}
	440	} else if (handler == SIG_IGN) {
	441	/* ignore sig */
	442	} else if (handler == SIG_ERR) {
	443	force_sig(sig);
	444	} else {
	445
	446	setup_frame(sig, k, 0, cpu_env);
	447	if (k->sa.sa_flags & SA_RESETHAND)
	448	k->sa.sa_handler = SIG_DFL;
	449	}
450	if (q != &k->info)
451	free_sigqueue(q);
452	}