/*
- * Emulation of Linux signal handling
+ * Emulation of Linux signals
*
* Copyright (c) 2003 Fabrice Bellard
*
*/
#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
#include <stdarg.h>
+#include <unistd.h>
#include <signal.h>
+#include <errno.h>
#include <sys/ucontext.h>
-/* Algorithm strongly inspired from em86 : we queue the signals so
- that we can handle them at precise points in the emulated code. */
+#ifdef __ia64__
+#undef uc_mcontext
+#undef uc_sigmask
+#undef uc_stack
+#undef uc_link
+#endif
+
+#include "qemu.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 nb_pending;
- struct target_siginfo info;
+ 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 */
};
-struct emulated_sigaction sigact_table[NSIG];
-int signal_pending;
+static struct emulated_sigaction sigact_table[TARGET_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 uint8_t host_to_target_signal_table[65] = {
+ [SIGHUP] = TARGET_SIGHUP,
+ [SIGINT] = TARGET_SIGINT,
+ [SIGQUIT] = TARGET_SIGQUIT,
+ [SIGILL] = TARGET_SIGILL,
+ [SIGTRAP] = TARGET_SIGTRAP,
+ [SIGABRT] = TARGET_SIGABRT,
+ [SIGIOT] = TARGET_SIGIOT,
+ [SIGBUS] = TARGET_SIGBUS,
+ [SIGFPE] = TARGET_SIGFPE,
+ [SIGKILL] = TARGET_SIGKILL,
+ [SIGUSR1] = TARGET_SIGUSR1,
+ [SIGSEGV] = TARGET_SIGSEGV,
+ [SIGUSR2] = TARGET_SIGUSR2,
+ [SIGPIPE] = TARGET_SIGPIPE,
+ [SIGALRM] = TARGET_SIGALRM,
+ [SIGTERM] = TARGET_SIGTERM,
+#ifdef SIGSTKFLT
+ [SIGSTKFLT] = TARGET_SIGSTKFLT,
+#endif
+ [SIGCHLD] = TARGET_SIGCHLD,
+ [SIGCONT] = TARGET_SIGCONT,
+ [SIGSTOP] = TARGET_SIGSTOP,
+ [SIGTSTP] = TARGET_SIGTSTP,
+ [SIGTTIN] = TARGET_SIGTTIN,
+ [SIGTTOU] = TARGET_SIGTTOU,
+ [SIGURG] = TARGET_SIGURG,
+ [SIGXCPU] = TARGET_SIGXCPU,
+ [SIGXFSZ] = TARGET_SIGXFSZ,
+ [SIGVTALRM] = TARGET_SIGVTALRM,
+ [SIGPROF] = TARGET_SIGPROF,
+ [SIGWINCH] = TARGET_SIGWINCH,
+ [SIGIO] = TARGET_SIGIO,
+ [SIGPWR] = TARGET_SIGPWR,
+ [SIGSYS] = TARGET_SIGSYS,
+ /* next signals stay the same */
+};
+static uint8_t target_to_host_signal_table[65];
static inline int host_to_target_signal(int sig)
{
- return sig;
+ return host_to_target_signal_table[sig];
}
static inline int target_to_host_signal(int sig)
{
- return sig;
+ return target_to_host_signal_table[sig];
+}
+
+void host_to_target_sigset(target_sigset_t *d, const sigset_t *s)
+{
+ int i;
+ unsigned long sigmask;
+ uint32_t target_sigmask;
+
+ sigmask = ((unsigned long *)s)[0];
+ target_sigmask = 0;
+ for(i = 0; i < 32; i++) {
+ if (sigmask & (1 << i))
+ target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1);
+ }
+#if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
+ d->sig[0] = tswapl(target_sigmask);
+ for(i = 1;i < TARGET_NSIG_WORDS; i++) {
+ d->sig[i] = tswapl(((unsigned long *)s)[i]);
+ }
+#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
+ d->sig[0] = tswapl(target_sigmask);
+ d->sig[1] = tswapl(sigmask >> 32);
+#else
+#error host_to_target_sigset
+#endif
+}
+
+void target_to_host_sigset(sigset_t *d, const target_sigset_t *s)
+{
+ int i;
+ unsigned long sigmask;
+ target_ulong target_sigmask;
+
+ target_sigmask = tswapl(s->sig[0]);
+ sigmask = 0;
+ for(i = 0; i < 32; i++) {
+ if (target_sigmask & (1 << i))
+ sigmask |= 1 << (target_to_host_signal(i + 1) - 1);
+ }
+#if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32
+ ((unsigned long *)d)[0] = sigmask;
+ for(i = 1;i < TARGET_NSIG_WORDS; i++) {
+ ((unsigned long *)d)[i] = tswapl(s->sig[i]);
+ }
+#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2
+ ((unsigned long *)d)[0] = sigmask | ((unsigned long)tswapl(s->sig[1]) << 32);
+#else
+#error target_to_host_sigset
+#endif /* TARGET_LONG_BITS */
+}
+
+void host_to_target_old_sigset(target_ulong *old_sigset,
+ const sigset_t *sigset)
+{
+ target_sigset_t d;
+ host_to_target_sigset(&d, sigset);
+ *old_sigset = d.sig[0];
+}
+
+void target_to_host_old_sigset(sigset_t *sigset,
+ const target_ulong *old_sigset)
+{
+ target_sigset_t d;
+ int i;
+
+ d.sig[0] = *old_sigset;
+ for(i = 1;i < TARGET_NSIG_WORDS; i++)
+ d.sig[i] = 0;
+ target_to_host_sigset(sigset, &d);
+}
+
+/* siginfo conversion */
+
+static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
+ const siginfo_t *info)
+{
+ int sig;
+ sig = host_to_target_signal(info->si_signo);
+ tinfo->si_signo = sig;
+ tinfo->si_errno = 0;
+ tinfo->si_code = 0;
+ if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
+ sig == SIGBUS || sig == SIGTRAP) {
+ /* should never come here, but who knows. The information for
+ the target is irrelevant */
+ tinfo->_sifields._sigfault._addr = 0;
+ } else if (sig >= TARGET_SIGRTMIN) {
+ tinfo->_sifields._rt._pid = info->si_pid;
+ tinfo->_sifields._rt._uid = info->si_uid;
+ /* XXX: potential problem if 64 bit */
+ tinfo->_sifields._rt._sigval.sival_ptr =
+ (target_ulong)info->si_value.sival_ptr;
+ }
+}
+
+static void tswap_siginfo(target_siginfo_t *tinfo,
+ const target_siginfo_t *info)
+{
+ int sig;
+ sig = info->si_signo;
+ tinfo->si_signo = tswap32(sig);
+ tinfo->si_errno = tswap32(info->si_errno);
+ tinfo->si_code = tswap32(info->si_code);
+ if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
+ sig == SIGBUS || sig == SIGTRAP) {
+ tinfo->_sifields._sigfault._addr =
+ tswapl(info->_sifields._sigfault._addr);
+ } else if (sig >= TARGET_SIGRTMIN) {
+ tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid);
+ tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid);
+ tinfo->_sifields._rt._sigval.sival_ptr =
+ tswapl(info->_sifields._rt._sigval.sival_ptr);
+ }
+}
+
+
+void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
+{
+ host_to_target_siginfo_noswap(tinfo, info);
+ tswap_siginfo(tinfo, tinfo);
+}
+
+/* XXX: we support only POSIX RT signals are used. */
+/* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
+void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
+{
+ info->si_signo = tswap32(tinfo->si_signo);
+ info->si_errno = tswap32(tinfo->si_errno);
+ info->si_code = tswap32(tinfo->si_code);
+ info->si_pid = tswap32(tinfo->_sifields._rt._pid);
+ info->si_uid = tswap32(tinfo->_sifields._rt._uid);
+ info->si_value.sival_ptr =
+ (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
}
void signal_init(void)
{
struct sigaction act;
- int i;
+ int i, j;
- /* set all host signal handlers */
- sigemptyset(&act.sa_mask);
+ /* generate signal conversion tables */
+ for(i = 1; i <= 64; i++) {
+ if (host_to_target_signal_table[i] == 0)
+ host_to_target_signal_table[i] = i;
+ }
+ for(i = 1; i <= 64; i++) {
+ j = host_to_target_signal_table[i];
+ target_to_host_signal_table[j] = 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, &sa, NULL);
+ 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 __attribute((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));
+#if 1
+ _exit(-host_sig);
+#else
+ {
+ struct sigaction act;
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = SA_SIGINFO;
+ act.sa_sigaction = SIG_DFL;
+ sigaction(SIGABRT, &act, NULL);
+ abort();
+ }
+#endif
+}
+
+/* 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 = k->sa._sa_handler;
+ if (handler == TARGET_SIG_DFL) {
+ /* default handler : ignore some signal. The other are fatal */
+ if (sig != TARGET_SIGCHLD &&
+ sig != TARGET_SIGURG &&
+ sig != TARGET_SIGWINCH) {
+ force_sig(sig);
+ } else {
+ return 0; /* indicate ignored */
+ }
+ } else if (handler == TARGET_SIG_IGN) {
+ /* ignore signal */
+ return 0;
+ } else if (handler == TARGET_SIG_ERR) {
+ force_sig(sig);
+ } else {
+ pq = &k->first;
+ if (sig < TARGET_SIGRTMIN) {
+ /* if non real time signal, we queue exactly one signal */
+ if (!k->pending)
+ q = &k->info;
+ else
+ return 0;
+ } else {
+ 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 */
+ }
+}
+
+#if defined(DEBUG_SIGNAL)
+#ifdef __i386__
+static void dump_regs(struct ucontext *uc)
+{
+ fprintf(stderr,
+ "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
+ "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
+ "EFL=%08x EIP=%08x\n",
+ uc->uc_mcontext.gregs[EAX],
+ uc->uc_mcontext.gregs[EBX],
+ uc->uc_mcontext.gregs[ECX],
+ uc->uc_mcontext.gregs[EDX],
+ uc->uc_mcontext.gregs[ESI],
+ uc->uc_mcontext.gregs[EDI],
+ uc->uc_mcontext.gregs[EBP],
+ uc->uc_mcontext.gregs[ESP],
+ uc->uc_mcontext.gregs[EFL],
+ uc->uc_mcontext.gregs[EIP]);
+}
+#else
+static void dump_regs(struct ucontext *uc)
+{
}
+#endif
+
+#endif
static void host_signal_handler(int host_signum, siginfo_t *info,
void *puc)
{
- struct ucontext *uc = puc;
- int signum;
+ 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, info, puc))
+ return;
+ }
+
/* get target signal number */
- signum = host_to_target(host_signum);
- if (signum >= TARGET_NSIG)
+ sig = host_to_target_signal(host_signum);
+ if (sig < 1 || sig > TARGET_NSIG)
return;
- /* we save the old mask */
-
+#if defined(DEBUG_SIGNAL)
+ fprintf(stderr, "qemu: got signal %d\n", sig);
+ dump_regs(puc);
+#endif
+ host_to_target_siginfo_noswap(&tinfo, info);
+ if (queue_signal(sig, &tinfo) == 1) {
+ /* interrupt the virtual CPU as soon as possible */
+ cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
+ }
+}
+
+int do_sigaction(int sig, const struct target_sigaction *act,
+ struct target_sigaction *oact)
+{
+ struct emulated_sigaction *k;
+
+ if (sig < 1 || sig > TARGET_NSIG)
+ return -EINVAL;
+ k = &sigact_table[sig - 1];
+#if defined(DEBUG_SIGNAL) && 0
+ fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
+ sig, (int)act, (int)oact);
+#endif
+ if (oact) {
+ oact->_sa_handler = tswapl(k->sa._sa_handler);
+ oact->sa_flags = tswapl(k->sa.sa_flags);
+ oact->sa_restorer = tswapl(k->sa.sa_restorer);
+ oact->sa_mask = k->sa.sa_mask;
+ }
+ if (act) {
+ k->sa._sa_handler = tswapl(act->_sa_handler);
+ k->sa.sa_flags = tswapl(act->sa_flags);
+ k->sa.sa_restorer = tswapl(act->sa_restorer);
+ k->sa.sa_mask = act->sa_mask;
+ }
+ return 0;
+}
+
+#define __put_user(x,ptr)\
+({\
+ int size = sizeof(*ptr);\
+ switch(size) {\
+ case 1:\
+ stb(ptr, (typeof(*ptr))(x));\
+ break;\
+ case 2:\
+ stw(ptr, (typeof(*ptr))(x));\
+ break;\
+ case 4:\
+ stl(ptr, (typeof(*ptr))(x));\
+ break;\
+ case 8:\
+ stq(ptr, (typeof(*ptr))(x));\
+ break;\
+ default:\
+ abort();\
+ }\
+ 0;\
+})
+
+#define __get_user(x, ptr) \
+({\
+ int size = sizeof(*ptr);\
+ switch(size) {\
+ case 1:\
+ x = (typeof(*ptr))ldub(ptr);\
+ break;\
+ case 2:\
+ x = (typeof(*ptr))lduw(ptr);\
+ break;\
+ case 4:\
+ x = (typeof(*ptr))ldl(ptr);\
+ break;\
+ case 8:\
+ x = (typeof(*ptr))ldq(ptr);\
+ break;\
+ default:\
+ abort();\
+ }\
+ 0;\
+})
+
+
+#define __copy_to_user(dst, src, size)\
+({\
+ memcpy(dst, src, size);\
+ 0;\
+})
+
+#define __copy_from_user(dst, src, size)\
+({\
+ memcpy(dst, src, size);\
+ 0;\
+})
+
+#define __clear_user(dst, size)\
+({\
+ memset(dst, 0, size);\
+ 0;\
+})
+
+#ifndef offsetof
+#define offsetof(type, field) ((size_t) &((type *)0)->field)
+#endif
+
+static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
+ const target_siginfo_t *info)
+{
+ tswap_siginfo(tinfo, info);
+ return 0;
+}
+
+#ifdef TARGET_I386
+
+/* from the Linux kernel */
+
+struct target_fpreg {
+ uint16_t significand[4];
+ uint16_t exponent;
+};
+
+struct target_fpxreg {
+ uint16_t significand[4];
+ uint16_t exponent;
+ uint16_t padding[3];
+};
+
+struct target_xmmreg {
+ target_ulong element[4];
+};
+
+struct target_fpstate {
+ /* Regular FPU environment */
+ target_ulong cw;
+ target_ulong sw;
+ target_ulong tag;
+ target_ulong ipoff;
+ target_ulong cssel;
+ target_ulong dataoff;
+ target_ulong datasel;
+ struct target_fpreg _st[8];
+ uint16_t status;
+ uint16_t magic; /* 0xffff = regular FPU data only */
+
+ /* FXSR FPU environment */
+ target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */
+ target_ulong mxcsr;
+ target_ulong reserved;
+ struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
+ struct target_xmmreg _xmm[8];
+ target_ulong padding[56];
+};
+
+#define X86_FXSR_MAGIC 0x0000
+
+struct target_sigcontext {
+ uint16_t gs, __gsh;
+ uint16_t fs, __fsh;
+ uint16_t es, __esh;
+ uint16_t ds, __dsh;
+ target_ulong edi;
+ target_ulong esi;
+ target_ulong ebp;
+ target_ulong esp;
+ target_ulong ebx;
+ target_ulong edx;
+ target_ulong ecx;
+ target_ulong eax;
+ target_ulong trapno;
+ target_ulong err;
+ target_ulong eip;
+ uint16_t cs, __csh;
+ target_ulong eflags;
+ target_ulong esp_at_signal;
+ uint16_t ss, __ssh;
+ target_ulong fpstate; /* pointer */
+ target_ulong oldmask;
+ target_ulong cr2;
+};
+
+typedef struct target_sigaltstack {
+ target_ulong ss_sp;
+ int ss_flags;
+ target_ulong ss_size;
+} target_stack_t;
+
+struct target_ucontext {
+ target_ulong uc_flags;
+ target_ulong uc_link;
+ target_stack_t uc_stack;
+ struct target_sigcontext uc_mcontext;
+ target_sigset_t uc_sigmask; /* mask last for extensibility */
+};
+
+struct sigframe
+{
+ target_ulong pretcode;
+ int sig;
+ struct target_sigcontext sc;
+ struct target_fpstate fpstate;
+ target_ulong extramask[TARGET_NSIG_WORDS-1];
+ char retcode[8];
+};
+
+struct rt_sigframe
+{
+ target_ulong pretcode;
+ int sig;
+ target_ulong pinfo;
+ target_ulong puc;
+ struct target_siginfo info;
+ struct target_ucontext uc;
+ struct target_fpstate fpstate;
+ char retcode[8];
+};
+
+/*
+ * Set up a signal frame.
+ */
+
+/* XXX: save x87 state */
+static int
+setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
+ CPUX86State *env, unsigned long mask)
+{
+ int err = 0;
+
+ err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
+ err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
+ err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
+ err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
+ err |= __put_user(env->regs[R_EDI], &sc->edi);
+ err |= __put_user(env->regs[R_ESI], &sc->esi);
+ err |= __put_user(env->regs[R_EBP], &sc->ebp);
+ err |= __put_user(env->regs[R_ESP], &sc->esp);
+ err |= __put_user(env->regs[R_EBX], &sc->ebx);
+ err |= __put_user(env->regs[R_EDX], &sc->edx);
+ err |= __put_user(env->regs[R_ECX], &sc->ecx);
+ err |= __put_user(env->regs[R_EAX], &sc->eax);
+ err |= __put_user(env->exception_index, &sc->trapno);
+ err |= __put_user(env->error_code, &sc->err);
+ err |= __put_user(env->eip, &sc->eip);
+ err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
+ err |= __put_user(env->eflags, &sc->eflags);
+ err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
+ err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
+
+ cpu_x86_fsave(env, (void *)fpstate, 1);
+ fpstate->status = fpstate->sw;
+ err |= __put_user(0xffff, &fpstate->magic);
+ err |= __put_user(fpstate, &sc->fpstate);
+
+ /* non-iBCS2 extensions.. */
+ err |= __put_user(mask, &sc->oldmask);
+ err |= __put_user(env->cr[2], &sc->cr2);
+ return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+
+static inline void *
+get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
+{
+ unsigned long esp;
+
+ /* Default to using normal stack */
+ esp = env->regs[R_ESP];
+#if 0
+ /* This is the X/Open sanctioned signal stack switching. */
+ if (ka->sa.sa_flags & SA_ONSTACK) {
+ if (sas_ss_flags(esp) == 0)
+ esp = current->sas_ss_sp + current->sas_ss_size;
+ }
+
+ /* This is the legacy signal stack switching. */
+ else
+#endif
+ if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
+ !(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
+ ka->sa.sa_restorer) {
+ esp = (unsigned long) ka->sa.sa_restorer;
+ }
+ return (void *)((esp - frame_size) & -8ul);
+}
+
+static void setup_frame(int sig, struct emulated_sigaction *ka,
+ target_sigset_t *set, CPUX86State *env)
+{
+ struct sigframe *frame;
+ int err = 0;
+
+ frame = get_sigframe(ka, env, sizeof(*frame));
+
+#if 0
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+#endif
+ err |= __put_user((/*current->exec_domain
+ && current->exec_domain->signal_invmap
+ && sig < 32
+ ? current->exec_domain->signal_invmap[sig]
+ : */ sig),
+ &frame->sig);
+ if (err)
+ goto give_sigsegv;
+
+ setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
+ if (err)
+ goto give_sigsegv;
+
+ if (TARGET_NSIG_WORDS > 1) {
+ err |= __copy_to_user(frame->extramask, &set->sig[1],
+ sizeof(frame->extramask));
+ }
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up to return from userspace. If provided, use a stub
+ already in userspace. */
+ if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
+ err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
+ } else {
+ err |= __put_user(frame->retcode, &frame->pretcode);
+ /* This is popl %eax ; movl $,%eax ; int $0x80 */
+ err |= __put_user(0xb858, (short *)(frame->retcode+0));
+ err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
+ err |= __put_user(0x80cd, (short *)(frame->retcode+6));
+ }
+
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up registers for signal handler */
+ env->regs[R_ESP] = (unsigned long) frame;
+ env->eip = (unsigned long) ka->sa._sa_handler;
+
+ cpu_x86_load_seg(env, R_DS, __USER_DS);
+ cpu_x86_load_seg(env, R_ES, __USER_DS);
+ cpu_x86_load_seg(env, R_SS, __USER_DS);
+ cpu_x86_load_seg(env, R_CS, __USER_CS);
+ env->eflags &= ~TF_MASK;
+
+ return;
+
+give_sigsegv:
+ if (sig == TARGET_SIGSEGV)
+ ka->sa._sa_handler = TARGET_SIG_DFL;
+ force_sig(TARGET_SIGSEGV /* , current */);
+}
+
+static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
+ target_siginfo_t *info,
+ target_sigset_t *set, CPUX86State *env)
+{
+ struct rt_sigframe *frame;
+ int err = 0;
+
+ frame = get_sigframe(ka, env, sizeof(*frame));
+
+#if 0
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+#endif
+
+ err |= __put_user((/*current->exec_domain
+ && current->exec_domain->signal_invmap
+ && sig < 32
+ ? current->exec_domain->signal_invmap[sig]
+ : */sig),
+ &frame->sig);
+ err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
+ err |= __put_user((target_ulong)&frame->uc, &frame->puc);
+ err |= copy_siginfo_to_user(&frame->info, info);
+ if (err)
+ goto give_sigsegv;
+
+ /* Create the ucontext. */
+ err |= __put_user(0, &frame->uc.uc_flags);
+ err |= __put_user(0, &frame->uc.uc_link);
+ err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
+ err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
+ &frame->uc.uc_stack.ss_flags);
+ err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
+ err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
+ env, set->sig[0]);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up to return from userspace. If provided, use a stub
+ already in userspace. */
+ if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
+ err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
+ } else {
+ err |= __put_user(frame->retcode, &frame->pretcode);
+ /* This is movl $,%eax ; int $0x80 */
+ err |= __put_user(0xb8, (char *)(frame->retcode+0));
+ err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
+ err |= __put_user(0x80cd, (short *)(frame->retcode+5));
+ }
+
+ if (err)
+ goto give_sigsegv;
+
+ /* Set up registers for signal handler */
+ env->regs[R_ESP] = (unsigned long) frame;
+ env->eip = (unsigned long) ka->sa._sa_handler;
+
+ cpu_x86_load_seg(env, R_DS, __USER_DS);
+ cpu_x86_load_seg(env, R_ES, __USER_DS);
+ cpu_x86_load_seg(env, R_SS, __USER_DS);
+ cpu_x86_load_seg(env, R_CS, __USER_CS);
+ env->eflags &= ~TF_MASK;
+
+ return;
+
+give_sigsegv:
+ if (sig == TARGET_SIGSEGV)
+ ka->sa._sa_handler = TARGET_SIG_DFL;
+ force_sig(TARGET_SIGSEGV /* , current */);
+}
+
+static int
+restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
+{
+ unsigned int err = 0;
+
+ cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
+ cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
+ cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
+ cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
+
+ env->regs[R_EDI] = ldl(&sc->edi);
+ env->regs[R_ESI] = ldl(&sc->esi);
+ env->regs[R_EBP] = ldl(&sc->ebp);
+ env->regs[R_ESP] = ldl(&sc->esp);
+ env->regs[R_EBX] = ldl(&sc->ebx);
+ env->regs[R_EDX] = ldl(&sc->edx);
+ env->regs[R_ECX] = ldl(&sc->ecx);
+ env->eip = ldl(&sc->eip);
+
+ cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
+ cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
+
+ {
+ unsigned int tmpflags;
+ tmpflags = ldl(&sc->eflags);
+ env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
+ // regs->orig_eax = -1; /* disable syscall checks */
+ }
+
+ {
+ struct _fpstate * buf;
+ buf = (void *)ldl(&sc->fpstate);
+ if (buf) {
+#if 0
+ if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
+ goto badframe;
+#endif
+ cpu_x86_frstor(env, (void *)buf, 1);
+ }
+ }
+
+ *peax = ldl(&sc->eax);
+ return err;
+#if 0
+badframe:
+ return 1;
+#endif
+}
+
+long do_sigreturn(CPUX86State *env)
+{
+ struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
+ target_sigset_t target_set;
+ sigset_t set;
+ int eax, i;
+
+#if defined(DEBUG_SIGNAL)
+ fprintf(stderr, "do_sigreturn\n");
+#endif
+ /* set blocked signals */
+ target_set.sig[0] = frame->sc.oldmask;
+ for(i = 1; i < TARGET_NSIG_WORDS; i++)
+ target_set.sig[i] = frame->extramask[i - 1];
+
+ target_to_host_sigset(&set, &target_set);
+ sigprocmask(SIG_SETMASK, &set, NULL);
+ /* restore registers */
+ if (restore_sigcontext(env, &frame->sc, &eax))
+ goto badframe;
+ return eax;
+
+badframe:
+ force_sig(TARGET_SIGSEGV);
+ return 0;
}
+long do_rt_sigreturn(CPUX86State *env)
+{
+ struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4);
+ target_sigset_t target_set;
+ sigset_t set;
+ // stack_t st;
+ int eax;
+
+#if 0
+ if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+#endif
+ memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
+
+ target_to_host_sigset(&set, &target_set);
+ sigprocmask(SIG_SETMASK, &set, NULL);
+
+ if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
+ goto badframe;
+
+#if 0
+ if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
+ goto badframe;
+ /* It is more difficult to avoid calling this function than to
+ call it and ignore errors. */
+ do_sigaltstack(&st, NULL, regs->esp);
+#endif
+ return eax;
+
+badframe:
+ force_sig(TARGET_SIGSEGV);
+ return 0;
+}
-void process_pending_signals(void)
+#elif defined(TARGET_ARM)
+
+struct target_sigcontext {
+ target_ulong trap_no;
+ target_ulong error_code;
+ target_ulong oldmask;
+ target_ulong arm_r0;
+ target_ulong arm_r1;
+ target_ulong arm_r2;
+ target_ulong arm_r3;
+ target_ulong arm_r4;
+ target_ulong arm_r5;
+ target_ulong arm_r6;
+ target_ulong arm_r7;
+ target_ulong arm_r8;
+ target_ulong arm_r9;
+ target_ulong arm_r10;
+ target_ulong arm_fp;
+ target_ulong arm_ip;
+ target_ulong arm_sp;
+ target_ulong arm_lr;
+ target_ulong arm_pc;
+ target_ulong arm_cpsr;
+ target_ulong fault_address;
+};
+
+typedef struct target_sigaltstack {
+ target_ulong ss_sp;
+ int ss_flags;
+ target_ulong ss_size;
+} target_stack_t;
+
+struct target_ucontext {
+ target_ulong uc_flags;
+ target_ulong uc_link;
+ target_stack_t uc_stack;
+ struct target_sigcontext uc_mcontext;
+ target_sigset_t uc_sigmask; /* mask last for extensibility */
+};
+
+struct sigframe
+{
+ struct target_sigcontext sc;
+ target_ulong extramask[TARGET_NSIG_WORDS-1];
+ target_ulong retcode;
+};
+
+struct rt_sigframe
+{
+ struct target_siginfo *pinfo;
+ void *puc;
+ struct target_siginfo info;
+ struct target_ucontext uc;
+ target_ulong retcode;
+};
+
+#define TARGET_CONFIG_CPU_32 1
+
+/*
+ * For ARM syscalls, we encode the syscall number into the instruction.
+ */
+#define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
+#define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
+
+/*
+ * For Thumb syscalls, we pass the syscall number via r7. We therefore
+ * need two 16-bit instructions.
+ */
+#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
+#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
+
+static const target_ulong retcodes[4] = {
+ SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
+ SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN
+};
+
+
+#define __put_user_error(x,p,e) __put_user(x, p)
+#define __get_user_error(x,p,e) __get_user(x, p)
+
+static inline int valid_user_regs(CPUState *regs)
+{
+ return 1;
+}
+
+static int
+setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
+ CPUState *env, unsigned long mask)
{
- int signum;
- target_ulong _sa_handler;
+ int err = 0;
- struct emulated_sigaction *esig;
+ __put_user_error(env->regs[0], &sc->arm_r0, err);
+ __put_user_error(env->regs[1], &sc->arm_r1, err);
+ __put_user_error(env->regs[2], &sc->arm_r2, err);
+ __put_user_error(env->regs[3], &sc->arm_r3, err);
+ __put_user_error(env->regs[4], &sc->arm_r4, err);
+ __put_user_error(env->regs[5], &sc->arm_r5, err);
+ __put_user_error(env->regs[6], &sc->arm_r6, err);
+ __put_user_error(env->regs[7], &sc->arm_r7, err);
+ __put_user_error(env->regs[8], &sc->arm_r8, err);
+ __put_user_error(env->regs[9], &sc->arm_r9, err);
+ __put_user_error(env->regs[10], &sc->arm_r10, err);
+ __put_user_error(env->regs[11], &sc->arm_fp, err);
+ __put_user_error(env->regs[12], &sc->arm_ip, err);
+ __put_user_error(env->regs[13], &sc->arm_sp, err);
+ __put_user_error(env->regs[14], &sc->arm_lr, err);
+ __put_user_error(env->regs[15], &sc->arm_pc, err);
+#ifdef TARGET_CONFIG_CPU_32
+ __put_user_error(env->cpsr, &sc->arm_cpsr, err);
+#endif
+
+ __put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err);
+ __put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err);
+ __put_user_error(/* current->thread.address */ 0, &sc->fault_address, err);
+ __put_user_error(mask, &sc->oldmask, err);
+
+ return err;
+}
+
+static inline void *
+get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize)
+{
+ unsigned long sp = regs->regs[13];
+
+#if 0
+ /*
+ * This is the X/Open sanctioned signal stack switching.
+ */
+ if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
+ sp = current->sas_ss_sp + current->sas_ss_size;
+#endif
+ /*
+ * ATPCS B01 mandates 8-byte alignment
+ */
+ return (void *)((sp - framesize) & ~7);
+}
+
+static int
+setup_return(CPUState *env, struct emulated_sigaction *ka,
+ target_ulong *rc, void *frame, int usig)
+{
+ target_ulong handler = (target_ulong)ka->sa._sa_handler;
+ target_ulong retcode;
+ int thumb = 0;
+#if defined(TARGET_CONFIG_CPU_32)
+ target_ulong cpsr = env->cpsr;
+#if 0
+ /*
+ * Maybe we need to deliver a 32-bit signal to a 26-bit task.
+ */
+ if (ka->sa.sa_flags & SA_THIRTYTWO)
+ cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
+
+#ifdef CONFIG_ARM_THUMB
+ if (elf_hwcap & HWCAP_THUMB) {
+ /*
+ * The LSB of the handler determines if we're going to
+ * be using THUMB or ARM mode for this signal handler.
+ */
+ thumb = handler & 1;
+
+ if (thumb)
+ cpsr |= T_BIT;
+ else
+ cpsr &= ~T_BIT;
+ }
+#endif
+#endif
+#endif /* TARGET_CONFIG_CPU_32 */
+
+ if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
+ retcode = (target_ulong)ka->sa.sa_restorer;
+ } else {
+ unsigned int idx = thumb;
+
+ if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
+ idx += 2;
+
+ if (__put_user(retcodes[idx], rc))
+ return 1;
+#if 0
+ flush_icache_range((target_ulong)rc,
+ (target_ulong)(rc + 1));
+#endif
+ retcode = ((target_ulong)rc) + thumb;
+ }
+
+ env->regs[0] = usig;
+ env->regs[13] = (target_ulong)frame;
+ env->regs[14] = retcode;
+ env->regs[15] = handler & (thumb ? ~1 : ~3);
+
+#ifdef TARGET_CONFIG_CPU_32
+ env->cpsr = cpsr;
+#endif
+
+ return 0;
+}
+
+static void setup_frame(int usig, struct emulated_sigaction *ka,
+ target_sigset_t *set, CPUState *regs)
+{
+ struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
+ int err = 0;
+
+ err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
+
+ if (TARGET_NSIG_WORDS > 1) {
+ err |= __copy_to_user(frame->extramask, &set->sig[1],
+ sizeof(frame->extramask));
+ }
+
+ if (err == 0)
+ err = setup_return(regs, ka, &frame->retcode, frame, usig);
+ // return err;
+}
+
+static void setup_rt_frame(int usig, struct emulated_sigaction *ka,
+ target_siginfo_t *info,
+ target_sigset_t *set, CPUState *env)
+{
+ struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame));
+ int err = 0;
+
+#if 0
+ if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
+ return 1;
+#endif
+ __put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err);
+ __put_user_error(&frame->uc, (target_ulong *)&frame->puc, err);
+ err |= copy_siginfo_to_user(&frame->info, info);
+
+ /* Clear all the bits of the ucontext we don't use. */
+ err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
+
+ err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
+ env, set->sig[0]);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
+ if (err == 0)
+ err = setup_return(env, ka, &frame->retcode, frame, usig);
+
+ if (err == 0) {
+ /*
+ * For realtime signals we must also set the second and third
+ * arguments for the signal handler.
+ * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
+ */
+ env->regs[1] = (target_ulong)frame->pinfo;
+ env->regs[2] = (target_ulong)frame->puc;
+ }
+
+ // return err;
+}
+
+static int
+restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
+{
+ int err = 0;
+
+ __get_user_error(env->regs[0], &sc->arm_r0, err);
+ __get_user_error(env->regs[1], &sc->arm_r1, err);
+ __get_user_error(env->regs[2], &sc->arm_r2, err);
+ __get_user_error(env->regs[3], &sc->arm_r3, err);
+ __get_user_error(env->regs[4], &sc->arm_r4, err);
+ __get_user_error(env->regs[5], &sc->arm_r5, err);
+ __get_user_error(env->regs[6], &sc->arm_r6, err);
+ __get_user_error(env->regs[7], &sc->arm_r7, err);
+ __get_user_error(env->regs[8], &sc->arm_r8, err);
+ __get_user_error(env->regs[9], &sc->arm_r9, err);
+ __get_user_error(env->regs[10], &sc->arm_r10, err);
+ __get_user_error(env->regs[11], &sc->arm_fp, err);
+ __get_user_error(env->regs[12], &sc->arm_ip, err);
+ __get_user_error(env->regs[13], &sc->arm_sp, err);
+ __get_user_error(env->regs[14], &sc->arm_lr, err);
+ __get_user_error(env->regs[15], &sc->arm_pc, err);
+#ifdef TARGET_CONFIG_CPU_32
+ __get_user_error(env->cpsr, &sc->arm_cpsr, err);
+#endif
+
+ err |= !valid_user_regs(env);
+
+ return err;
+}
+
+long do_sigreturn(CPUState *env)
+{
+ struct sigframe *frame;
+ target_sigset_t set;
+ sigset_t host_set;
+
+ /*
+ * Since we stacked the signal on a 64-bit boundary,
+ * then 'sp' should be word aligned here. If it's
+ * not, then the user is trying to mess with us.
+ */
+ if (env->regs[13] & 7)
+ goto badframe;
+
+ frame = (struct sigframe *)env->regs[13];
+
+#if 0
+ if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
+ goto badframe;
+#endif
+ if (__get_user(set.sig[0], &frame->sc.oldmask)
+ || (TARGET_NSIG_WORDS > 1
+ && __copy_from_user(&set.sig[1], &frame->extramask,
+ sizeof(frame->extramask))))
+ goto badframe;
+
+ target_to_host_sigset(&host_set, &set);
+ sigprocmask(SIG_SETMASK, &host_set, NULL);
+
+ if (restore_sigcontext(env, &frame->sc))
+ goto badframe;
+
+#if 0
+ /* Send SIGTRAP if we're single-stepping */
+ if (ptrace_cancel_bpt(current))
+ send_sig(SIGTRAP, current, 1);
+#endif
+ return env->regs[0];
+
+badframe:
+ force_sig(SIGSEGV /* , current */);
+ return 0;
+}
+
+long do_rt_sigreturn(CPUState *env)
+{
+ struct rt_sigframe *frame;
+ target_sigset_t set;
+ sigset_t host_set;
+
+ /*
+ * Since we stacked the signal on a 64-bit boundary,
+ * then 'sp' should be word aligned here. If it's
+ * not, then the user is trying to mess with us.
+ */
+ if (env->regs[13] & 7)
+ goto badframe;
+
+ frame = (struct rt_sigframe *)env->regs[13];
+
+#if 0
+ if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
+ goto badframe;
+#endif
+ if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ goto badframe;
+
+ target_to_host_sigset(&host_set, &set);
+ sigprocmask(SIG_SETMASK, &host_set, NULL);
+
+ if (restore_sigcontext(env, &frame->uc.uc_mcontext))
+ goto badframe;
+
+#if 0
+ /* Send SIGTRAP if we're single-stepping */
+ if (ptrace_cancel_bpt(current))
+ send_sig(SIGTRAP, current, 1);
+#endif
+ return env->regs[0];
+
+badframe:
+ force_sig(SIGSEGV /* , current */);
+ return 0;
+}
+
+#else
+
+static void setup_frame(int sig, struct emulated_sigaction *ka,
+ target_sigset_t *set, CPUState *env)
+{
+ fprintf(stderr, "setup_frame: not implemented\n");
+}
+
+static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
+ target_siginfo_t *info,
+ target_sigset_t *set, CPUState *env)
+{
+ fprintf(stderr, "setup_rt_frame: not implemented\n");
+}
+
+long do_sigreturn(CPUState *env)
+{
+ fprintf(stderr, "do_sigreturn: not implemented\n");
+ return -ENOSYS;
+}
+
+long do_rt_sigreturn(CPUState *env)
+{
+ fprintf(stderr, "do_rt_sigreturn: not implemented\n");
+ return -ENOSYS;
+}
+
+#endif
+
+void process_pending_signals(void *cpu_env)
+{
+ int sig;
+ target_ulong handler;
+ sigset_t set, old_set;
+ target_sigset_t target_old_set;
+ struct emulated_sigaction *k;
+ struct sigqueue *q;
+
if (!signal_pending)
return;
- esig = sigact_table;
- for(signum = 1; signum < TARGET_NSIG; signum++) {
- if (esig->nb_pending != 0)
+ k = sigact_table;
+ for(sig = 1; sig <= TARGET_NSIG; sig++) {
+ if (k->pending)
goto handle_signal;
- esig++;
+ k++;
}
/* if no signal is pending, just return */
signal_pending = 0;
return;
+
handle_signal:
- _sa_handler = esig->sa._sa_handler;
- if (_sa_handler == TARGET_SIG_DFL) {
- /* default handling
- }
+#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;
+ handler = k->sa._sa_handler;
+ if (handler == TARGET_SIG_DFL) {
+ /* default handler : ignore some signal. The other are fatal */
+ if (sig != TARGET_SIGCHLD &&
+ sig != TARGET_SIGURG &&
+ sig != TARGET_SIGWINCH) {
+ force_sig(sig);
+ }
+ } else if (handler == TARGET_SIG_IGN) {
+ /* ignore sig */
+ } else if (handler == TARGET_SIG_ERR) {
+ force_sig(sig);
+ } else {
+ /* compute the blocked signals during the handler execution */
+ target_to_host_sigset(&set, &k->sa.sa_mask);
+ /* SA_NODEFER indicates that the current signal should not be
+ blocked during the handler */
+ if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
+ sigaddset(&set, target_to_host_signal(sig));
+
+ /* block signals in the handler using Linux */
+ sigprocmask(SIG_BLOCK, &set, &old_set);
+ /* save the previous blocked signal state to restore it at the
+ end of the signal execution (see do_sigreturn) */
+ host_to_target_sigset(&target_old_set, &old_set);
+ /* if the CPU is in VM86 mode, we restore the 32 bit values */
+#ifdef TARGET_I386
+ {
+ CPUX86State *env = cpu_env;
+ if (env->eflags & VM_MASK)
+ save_v86_state(env);
+ }
+#endif
+ /* prepare the stack frame of the virtual CPU */
+ if (k->sa.sa_flags & TARGET_SA_SIGINFO)
+ setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
+ else
+ setup_frame(sig, k, &target_old_set, cpu_env);
+ if (k->sa.sa_flags & TARGET_SA_RESETHAND)
+ k->sa._sa_handler = TARGET_SIG_DFL;
+ }
+ if (q != &k->info)
+ free_sigqueue(q);
}
+
+
projects / qemu / blobdiff