diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 2067 |
1 files changed, 0 insertions, 2067 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c deleted file mode 100644 index 60f9eb7..0000000 --- a/linux-user/signal.c +++ /dev/null @@ -1,2067 +0,0 @@ -/* - * 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, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ -#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> - -#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 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 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 host_to_target_signal_table[sig]; -} - -static inline int target_to_host_signal(int sig) -{ - return target_to_host_signal_table[sig]; -} - -static void host_to_target_sigset_internal(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] = target_sigmask; - for(i = 1;i < TARGET_NSIG_WORDS; i++) { - d->sig[i] = ((unsigned long *)s)[i]; - } -#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2 - d->sig[0] = target_sigmask; - d->sig[1] = sigmask >> 32; -#else -#warning host_to_target_sigset -#endif -} - -void host_to_target_sigset(target_sigset_t *d, const sigset_t *s) -{ - target_sigset_t d1; - int i; - - host_to_target_sigset_internal(&d1, s); - for(i = 0;i < TARGET_NSIG_WORDS; i++) - d->sig[i] = tswapl(d1.sig[i]); -} - -void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s) -{ - int i; - unsigned long sigmask; - target_ulong target_sigmask; - - target_sigmask = 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] = s->sig[i]; - } -#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2 - ((unsigned long *)d)[0] = sigmask | ((unsigned long)(s->sig[1]) << 32); -#else -#warning target_to_host_sigset -#endif /* TARGET_LONG_BITS */ -} - -void target_to_host_sigset(sigset_t *d, const target_sigset_t *s) -{ - target_sigset_t s1; - int i; - - for(i = 0;i < TARGET_NSIG_WORDS; i++) - s1.sig[i] = tswapl(s->sig[i]); - target_to_host_sigset_internal(d, &s1); -} - -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, j; - - /* 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, &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 */ - } -} - -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 defined(TARGET_I386) && defined(USE_CODE_COPY) - || host_signum == SIGFPE -#endif - ) { - if (cpu_signal_handler(host_signum, info, puc)) - return; - } - - /* get target signal number */ - sig = host_to_target_signal(host_signum); - if (sig < 1 || sig > TARGET_NSIG) - return; -#if defined(DEBUG_SIGNAL) - fprintf(stderr, "qemu: got signal %d\n", sig); -#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; - struct sigaction act1; - int host_sig; - - if (sig < 1 || sig > TARGET_NSIG) - return -EINVAL; - k = &sigact_table[sig - 1]; -#if defined(DEBUG_SIGNAL) - 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); - #if !defined(TARGET_MIPS) - oact->sa_restorer = tswapl(k->sa.sa_restorer); - #endif - 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); - #if !defined(TARGET_MIPS) - k->sa.sa_restorer = tswapl(act->sa_restorer); - #endif - k->sa.sa_mask = act->sa_mask; - - /* we update the host linux signal state */ - host_sig = target_to_host_signal(sig); - if (host_sig != SIGSEGV && host_sig != SIGBUS) { - sigfillset(&act1.sa_mask); - act1.sa_flags = SA_SIGINFO; - if (k->sa.sa_flags & TARGET_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 == TARGET_SIG_IGN) { - act1.sa_sigaction = (void *)SIG_IGN; - } else if (k->sa._sa_handler == TARGET_SIG_DFL) { - act1.sa_sigaction = (void *)SIG_DFL; - } else { - act1.sa_sigaction = host_signal_handler; - } - sigaction(host_sig, &act1, NULL); - } - } - return 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 tuc_flags; - target_ulong tuc_link; - target_stack_t tuc_stack; - struct target_sigcontext tuc_mcontext; - target_sigset_t tuc_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 g2h((esp - frame_size) & -8ul); -} - -static void setup_frame(int sig, struct emulated_sigaction *ka, - target_sigset_t *set, CPUX86State *env) -{ - struct sigframe *frame; - int i, err = 0; - - frame = get_sigframe(ka, env, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - goto give_sigsegv; - 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; - - for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__put_user(set->sig[i], &frame->extramask[i - 1])) - 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] = h2g(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 i, err = 0; - - frame = get_sigframe(ka, env, sizeof(*frame)); - - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - goto give_sigsegv; - - 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.tuc_flags); - err |= __put_user(0, &frame->uc.tuc_link); - err |= __put_user(/*current->sas_ss_sp*/ 0, - &frame->uc.tuc_stack.ss_sp); - err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, - &frame->uc.tuc_stack.ss_flags); - err |= __put_user(/* current->sas_ss_size */ 0, - &frame->uc.tuc_stack.ss_size); - err |= setup_sigcontext(&frame->uc.tuc_mcontext, &frame->fpstate, - env, set->sig[0]); - for(i = 0; i < TARGET_NSIG_WORDS; i++) { - if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i])) - 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 *)g2h(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 */ - if (__get_user(target_set.sig[0], &frame->sc.oldmask)) - goto badframe; - for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__get_user(target_set.sig[i], &frame->extramask[i - 1])) - goto badframe; - } - - target_to_host_sigset_internal(&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 *)g2h(env->regs[R_ESP] - 4); - sigset_t set; - // stack_t st; - int eax; - -#if 0 - if (verify_area(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; -#endif - target_to_host_sigset(&set, &frame->uc.tuc_sigmask); - sigprocmask(SIG_SETMASK, &set, NULL); - - if (restore_sigcontext(env, &frame->uc.tuc_mcontext, &eax)) - goto badframe; - -#if 0 - if (__copy_from_user(&st, &frame->uc.tuc_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; -} - -#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 tuc_flags; - target_ulong tuc_link; - target_stack_t tuc_stack; - struct target_sigcontext tuc_mcontext; - target_sigset_t tuc_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 err = 0; - - __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(cpsr_read(env), &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 g2h((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) -#if 0 - target_ulong cpsr = env->cpsr; - - /* - * 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] = h2g(frame); - env->regs[14] = retcode; - env->regs[15] = handler & (thumb ? ~1 : ~3); - -#if 0 -#ifdef TARGET_CONFIG_CPU_32 - env->cpsr = cpsr; -#endif -#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 i, err = 0; - - err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]); - - for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__put_user(set->sig[i], &frame->extramask[i - 1])) - return; - } - - 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 i, err = 0; - - if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) - return /* 1 */; - - __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. */ - memset(&frame->uc, 0, offsetof(struct target_ucontext, tuc_mcontext)); - - err |= setup_sigcontext(&frame->uc.tuc_mcontext, /*&frame->fpstate,*/ - env, set->sig[0]); - for(i = 0; i < TARGET_NSIG_WORDS; i++) { - if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i])) - return; - } - - 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; - uint32_t cpsr; - - __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(cpsr, &sc->arm_cpsr, err); - cpsr_write(env, cpsr, 0xffffffff); -#endif - - err |= !valid_user_regs(env); - - return err; -} - -long do_sigreturn(CPUState *env) -{ - struct sigframe *frame; - target_sigset_t set; - sigset_t host_set; - int i; - - /* - * 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 *)g2h(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)) - goto badframe; - for(i = 1; i < TARGET_NSIG_WORDS; i++) { - if (__get_user(set.sig[i], &frame->extramask[i - 1])) - goto badframe; - } - - target_to_host_sigset_internal(&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; - 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 - target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask); - sigprocmask(SIG_SETMASK, &host_set, NULL); - - if (restore_sigcontext(env, &frame->uc.tuc_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; -} - -#elif defined(TARGET_SPARC) - -#define __SUNOS_MAXWIN 31 - -/* This is what SunOS does, so shall I. */ -struct target_sigcontext { - target_ulong sigc_onstack; /* state to restore */ - - target_ulong sigc_mask; /* sigmask to restore */ - target_ulong sigc_sp; /* stack pointer */ - target_ulong sigc_pc; /* program counter */ - target_ulong sigc_npc; /* next program counter */ - target_ulong sigc_psr; /* for condition codes etc */ - target_ulong sigc_g1; /* User uses these two registers */ - target_ulong sigc_o0; /* within the trampoline code. */ - - /* Now comes information regarding the users window set - * at the time of the signal. - */ - target_ulong sigc_oswins; /* outstanding windows */ - - /* stack ptrs for each regwin buf */ - char *sigc_spbuf[__SUNOS_MAXWIN]; - - /* Windows to restore after signal */ - struct { - target_ulong locals[8]; - target_ulong ins[8]; - } sigc_wbuf[__SUNOS_MAXWIN]; -}; -/* A Sparc stack frame */ -struct sparc_stackf { - target_ulong locals[8]; - target_ulong ins[6]; - struct sparc_stackf *fp; - target_ulong callers_pc; - char *structptr; - target_ulong xargs[6]; - target_ulong xxargs[1]; -}; - -typedef struct { - struct { - target_ulong psr; - target_ulong pc; - target_ulong npc; - target_ulong y; - target_ulong u_regs[16]; /* globals and ins */ - } si_regs; - int si_mask; -} __siginfo_t; - -typedef struct { - unsigned long si_float_regs [32]; - unsigned long si_fsr; - unsigned long si_fpqdepth; - struct { - unsigned long *insn_addr; - unsigned long insn; - } si_fpqueue [16]; -} qemu_siginfo_fpu_t; - - -struct target_signal_frame { - struct sparc_stackf ss; - __siginfo_t info; - qemu_siginfo_fpu_t *fpu_save; - target_ulong insns[2] __attribute__ ((aligned (8))); - target_ulong extramask[TARGET_NSIG_WORDS - 1]; - target_ulong extra_size; /* Should be 0 */ - qemu_siginfo_fpu_t fpu_state; -}; -struct target_rt_signal_frame { - struct sparc_stackf ss; - siginfo_t info; - target_ulong regs[20]; - sigset_t mask; - qemu_siginfo_fpu_t *fpu_save; - unsigned int insns[2]; - stack_t stack; - unsigned int extra_size; /* Should be 0 */ - qemu_siginfo_fpu_t fpu_state; -}; - -#define UREG_O0 16 -#define UREG_O6 22 -#define UREG_I0 0 -#define UREG_I1 1 -#define UREG_I2 2 -#define UREG_I6 6 -#define UREG_I7 7 -#define UREG_L0 8 -#define UREG_FP UREG_I6 -#define UREG_SP UREG_O6 - -static inline void *get_sigframe(struct emulated_sigaction *sa, CPUState *env, unsigned long framesize) -{ - unsigned long sp; - - sp = env->regwptr[UREG_FP]; -#if 0 - - /* This is the X/Open sanctioned signal stack switching. */ - if (sa->sa_flags & TARGET_SA_ONSTACK) { - if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7)) - sp = current->sas_ss_sp + current->sas_ss_size; - } -#endif - return g2h(sp - framesize); -} - -static int -setup___siginfo(__siginfo_t *si, CPUState *env, target_ulong mask) -{ - int err = 0, i; - - err |= __put_user(env->psr, &si->si_regs.psr); - err |= __put_user(env->pc, &si->si_regs.pc); - err |= __put_user(env->npc, &si->si_regs.npc); - err |= __put_user(env->y, &si->si_regs.y); - for (i=0; i < 8; i++) { - err |= __put_user(env->gregs[i], &si->si_regs.u_regs[i]); - } - for (i=0; i < 8; i++) { - err |= __put_user(env->regwptr[UREG_I0 + i], &si->si_regs.u_regs[i+8]); - } - err |= __put_user(mask, &si->si_mask); - return err; -} - -#if 0 -static int -setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/ - CPUState *env, unsigned long mask) -{ - int err = 0; - - err |= __put_user(mask, &sc->sigc_mask); - err |= __put_user(env->regwptr[UREG_SP], &sc->sigc_sp); - err |= __put_user(env->pc, &sc->sigc_pc); - err |= __put_user(env->npc, &sc->sigc_npc); - err |= __put_user(env->psr, &sc->sigc_psr); - err |= __put_user(env->gregs[1], &sc->sigc_g1); - err |= __put_user(env->regwptr[UREG_O0], &sc->sigc_o0); - - return err; -} -#endif -#define NF_ALIGNEDSZ (((sizeof(struct target_signal_frame) + 7) & (~7))) - -static void setup_frame(int sig, struct emulated_sigaction *ka, - target_sigset_t *set, CPUState *env) -{ - struct target_signal_frame *sf; - int sigframe_size, err, i; - - /* 1. Make sure everything is clean */ - //synchronize_user_stack(); - - sigframe_size = NF_ALIGNEDSZ; - - sf = (struct target_signal_frame *) - get_sigframe(ka, env, sigframe_size); - - //fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]); -#if 0 - if (invalid_frame_pointer(sf, sigframe_size)) - goto sigill_and_return; -#endif - /* 2. Save the current process state */ - err = setup___siginfo(&sf->info, env, set->sig[0]); - err |= __put_user(0, &sf->extra_size); - - //err |= save_fpu_state(regs, &sf->fpu_state); - //err |= __put_user(&sf->fpu_state, &sf->fpu_save); - - err |= __put_user(set->sig[0], &sf->info.si_mask); - for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) { - err |= __put_user(set->sig[i + 1], &sf->extramask[i]); - } - - for (i = 0; i < 8; i++) { - err |= __put_user(env->regwptr[i + UREG_L0], &sf->ss.locals[i]); - } - for (i = 0; i < 8; i++) { - err |= __put_user(env->regwptr[i + UREG_I0], &sf->ss.ins[i]); - } - if (err) - goto sigsegv; - - /* 3. signal handler back-trampoline and parameters */ - env->regwptr[UREG_FP] = h2g(sf); - env->regwptr[UREG_I0] = sig; - env->regwptr[UREG_I1] = h2g(&sf->info); - env->regwptr[UREG_I2] = h2g(&sf->info); - - /* 4. signal handler */ - env->pc = (unsigned long) ka->sa._sa_handler; - env->npc = (env->pc + 4); - /* 5. return to kernel instructions */ - if (ka->sa.sa_restorer) - env->regwptr[UREG_I7] = (unsigned long)ka->sa.sa_restorer; - else { - env->regwptr[UREG_I7] = h2g(&(sf->insns[0]) - 2); - - /* mov __NR_sigreturn, %g1 */ - err |= __put_user(0x821020d8, &sf->insns[0]); - - /* t 0x10 */ - err |= __put_user(0x91d02010, &sf->insns[1]); - if (err) - goto sigsegv; - - /* Flush instruction space. */ - //flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); - // tb_flush(env); - } - return; - - //sigill_and_return: - force_sig(TARGET_SIGILL); -sigsegv: - //fprintf(stderr, "force_sig\n"); - force_sig(TARGET_SIGSEGV); -} -static inline int -restore_fpu_state(CPUState *env, qemu_siginfo_fpu_t *fpu) -{ - int err; -#if 0 -#ifdef CONFIG_SMP - if (current->flags & PF_USEDFPU) - regs->psr &= ~PSR_EF; -#else - if (current == last_task_used_math) { - last_task_used_math = 0; - regs->psr &= ~PSR_EF; - } -#endif - current->used_math = 1; - current->flags &= ~PF_USEDFPU; -#endif -#if 0 - if (verify_area (VERIFY_READ, fpu, sizeof(*fpu))) - return -EFAULT; -#endif - - err = __copy_from_user(&env->fpr[0], &fpu->si_float_regs[0], - (sizeof(unsigned long) * 32)); - err |= __get_user(env->fsr, &fpu->si_fsr); -#if 0 - err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); - if (current->thread.fpqdepth != 0) - err |= __copy_from_user(¤t->thread.fpqueue[0], - &fpu->si_fpqueue[0], - ((sizeof(unsigned long) + - (sizeof(unsigned long *)))*16)); -#endif - return err; -} - - -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) -{ - struct target_signal_frame *sf; - uint32_t up_psr, pc, npc; - target_sigset_t set; - sigset_t host_set; - target_ulong fpu_save; - int err, i; - - sf = (struct target_signal_frame *)g2h(env->regwptr[UREG_FP]); -#if 0 - fprintf(stderr, "sigreturn\n"); - fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]); -#endif - //cpu_dump_state(env, stderr, fprintf, 0); - - /* 1. Make sure we are not getting garbage from the user */ -#if 0 - if (verify_area (VERIFY_READ, sf, sizeof (*sf))) - goto segv_and_exit; -#endif - - if (((uint) sf) & 3) - goto segv_and_exit; - - err = __get_user(pc, &sf->info.si_regs.pc); - err |= __get_user(npc, &sf->info.si_regs.npc); - - if ((pc | npc) & 3) - goto segv_and_exit; - - /* 2. Restore the state */ - err |= __get_user(up_psr, &sf->info.si_regs.psr); - - /* User can only change condition codes and FPU enabling in %psr. */ - env->psr = (up_psr & (PSR_ICC /* | PSR_EF */)) - | (env->psr & ~(PSR_ICC /* | PSR_EF */)); - - env->pc = pc; - env->npc = npc; - err |= __get_user(env->y, &sf->info.si_regs.y); - for (i=0; i < 8; i++) { - err |= __get_user(env->gregs[i], &sf->info.si_regs.u_regs[i]); - } - for (i=0; i < 8; i++) { - err |= __get_user(env->regwptr[i + UREG_I0], &sf->info.si_regs.u_regs[i+8]); - } - - err |= __get_user(fpu_save, (target_ulong *)&sf->fpu_save); - - //if (fpu_save) - // err |= restore_fpu_state(env, fpu_save); - - /* This is pretty much atomic, no amount locking would prevent - * the races which exist anyways. - */ - err |= __get_user(set.sig[0], &sf->info.si_mask); - for(i = 1; i < TARGET_NSIG_WORDS; i++) { - err |= (__get_user(set.sig[i], &sf->extramask[i - 1])); - } - - target_to_host_sigset_internal(&host_set, &set); - sigprocmask(SIG_SETMASK, &host_set, NULL); - - if (err) - goto segv_and_exit; - - return env->regwptr[0]; - -segv_and_exit: - force_sig(TARGET_SIGSEGV); -} - -long do_rt_sigreturn(CPUState *env) -{ - fprintf(stderr, "do_rt_sigreturn: not implemented\n"); - return -ENOSYS; -} - -#elif defined(TARGET_MIPS) - -struct target_sigcontext { - uint32_t sc_regmask; /* Unused */ - uint32_t sc_status; - uint64_t sc_pc; - uint64_t sc_regs[32]; - uint64_t sc_fpregs[32]; - uint32_t sc_ownedfp; /* Unused */ - uint32_t sc_fpc_csr; - uint32_t sc_fpc_eir; /* Unused */ - uint32_t sc_used_math; - uint32_t sc_dsp; /* dsp status, was sc_ssflags */ - uint64_t sc_mdhi; - uint64_t sc_mdlo; - target_ulong sc_hi1; /* Was sc_cause */ - target_ulong sc_lo1; /* Was sc_badvaddr */ - target_ulong sc_hi2; /* Was sc_sigset[4] */ - target_ulong sc_lo2; - target_ulong sc_hi3; - target_ulong sc_lo3; -}; - -struct sigframe { - uint32_t sf_ass[4]; /* argument save space for o32 */ - uint32_t sf_code[2]; /* signal trampoline */ - struct target_sigcontext sf_sc; - target_sigset_t sf_mask; -}; - -/* Install trampoline to jump back from signal handler */ -static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall) -{ - int err; - - /* - * Set up the return code ... - * - * li v0, __NR__foo_sigreturn - * syscall - */ - - err = __put_user(0x24020000 + syscall, tramp + 0); - err |= __put_user(0x0000000c , tramp + 1); - /* flush_cache_sigtramp((unsigned long) tramp); */ - return err; -} - -static inline int -setup_sigcontext(CPUState *regs, struct target_sigcontext *sc) -{ - int err = 0; - - err |= __put_user(regs->PC, &sc->sc_pc); - - #define save_gp_reg(i) do { \ - err |= __put_user(regs->gpr[i], &sc->sc_regs[i]); \ - } while(0) - __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); - save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); - save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); - save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); - save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); - save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); - save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); - save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); - save_gp_reg(31); - #undef save_gp_reg - - err |= __put_user(regs->HI, &sc->sc_mdhi); - err |= __put_user(regs->LO, &sc->sc_mdlo); - - /* Not used yet, but might be useful if we ever have DSP suppport */ -#if 0 - if (cpu_has_dsp) { - err |= __put_user(mfhi1(), &sc->sc_hi1); - err |= __put_user(mflo1(), &sc->sc_lo1); - err |= __put_user(mfhi2(), &sc->sc_hi2); - err |= __put_user(mflo2(), &sc->sc_lo2); - err |= __put_user(mfhi3(), &sc->sc_hi3); - err |= __put_user(mflo3(), &sc->sc_lo3); - err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); - } - /* same with 64 bit */ - #ifdef CONFIG_64BIT - err |= __put_user(regs->hi, &sc->sc_hi[0]); - err |= __put_user(regs->lo, &sc->sc_lo[0]); - if (cpu_has_dsp) { - err |= __put_user(mfhi1(), &sc->sc_hi[1]); - err |= __put_user(mflo1(), &sc->sc_lo[1]); - err |= __put_user(mfhi2(), &sc->sc_hi[2]); - err |= __put_user(mflo2(), &sc->sc_lo[2]); - err |= __put_user(mfhi3(), &sc->sc_hi[3]); - err |= __put_user(mflo3(), &sc->sc_lo[3]); - err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); - } - #endif - - - #endif - - - #if 0 - err |= __put_user(!!used_math(), &sc->sc_used_math); - - if (!used_math()) - goto out; - - /* - * Save FPU state to signal context. Signal handler will "inherit" - * current FPU state. - */ - preempt_disable(); - - if (!is_fpu_owner()) { - own_fpu(); - restore_fp(current); - } - err |= save_fp_context(sc); - - preempt_enable(); - out: -#endif - return err; -} - -static inline int -restore_sigcontext(CPUState *regs, struct target_sigcontext *sc) -{ - int err = 0; - - err |= __get_user(regs->CP0_EPC, &sc->sc_pc); - - err |= __get_user(regs->HI, &sc->sc_mdhi); - err |= __get_user(regs->LO, &sc->sc_mdlo); - - #define restore_gp_reg(i) do { \ - err |= __get_user(regs->gpr[i], &sc->sc_regs[i]); \ - } while(0) - restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); - restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); - restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); - restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); - restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); - restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); - restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); - restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); - restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); - restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); - restore_gp_reg(31); - #undef restore_gp_reg - -#if 0 - if (cpu_has_dsp) { - err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); - err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); - err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); - err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); - err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); - err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); - err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); - } - #ifdef CONFIG_64BIT - err |= __get_user(regs->hi, &sc->sc_hi[0]); - err |= __get_user(regs->lo, &sc->sc_lo[0]); - if (cpu_has_dsp) { - err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg); - err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg); - err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg); - err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg); - err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg); - err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg); - err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); - } - #endif - - err |= __get_user(used_math, &sc->sc_used_math); - conditional_used_math(used_math); - - preempt_disable(); - - if (used_math()) { - /* restore fpu context if we have used it before */ - own_fpu(); - err |= restore_fp_context(sc); - } else { - /* signal handler may have used FPU. Give it up. */ - lose_fpu(); - } - - preempt_enable(); -#endif - return err; -} -/* - * Determine which stack to use.. - */ -static inline void * -get_sigframe(struct emulated_sigaction *ka, CPUState *regs, size_t frame_size) -{ - unsigned long sp; - - /* Default to using normal stack */ - sp = regs->gpr[29]; - - /* - * FPU emulator may have it's own trampoline active just - * above the user stack, 16-bytes before the next lowest - * 16 byte boundary. Try to avoid trashing it. - */ - sp -= 32; - -#if 0 - /* This is the X/Open sanctioned signal stack switching. */ - if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) - sp = current->sas_ss_sp + current->sas_ss_size; -#endif - - return g2h((sp - frame_size) & ~7); -} - -static void setup_frame(int sig, struct emulated_sigaction * ka, - target_sigset_t *set, CPUState *regs) -{ - struct sigframe *frame; - int i; - - frame = get_sigframe(ka, regs, sizeof(*frame)); - if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) - goto give_sigsegv; - - install_sigtramp(frame->sf_code, TARGET_NR_sigreturn); - - if(setup_sigcontext(regs, &frame->sf_sc)) - goto give_sigsegv; - - for(i = 0; i < TARGET_NSIG_WORDS; i++) { - if(__put_user(set->sig[i], &frame->sf_mask.sig[i])) - goto give_sigsegv; - } - - /* - * Arguments to signal handler: - * - * a0 = signal number - * a1 = 0 (should be cause) - * a2 = pointer to struct sigcontext - * - * $25 and PC point to the signal handler, $29 points to the - * struct sigframe. - */ - regs->gpr[ 4] = sig; - regs->gpr[ 5] = 0; - regs->gpr[ 6] = h2g(&frame->sf_sc); - regs->gpr[29] = h2g(frame); - regs->gpr[31] = h2g(frame->sf_code); - /* The original kernel code sets CP0_EPC to the handler - * since it returns to userland using eret - * we cannot do this here, and we must set PC directly */ - regs->PC = regs->gpr[25] = ka->sa._sa_handler; - return; - -give_sigsegv: - force_sig(TARGET_SIGSEGV/*, current*/); - return; -} - -long do_sigreturn(CPUState *regs) -{ - struct sigframe *frame; - sigset_t blocked; - target_sigset_t target_set; - int i; - -#if defined(DEBUG_SIGNAL) - fprintf(stderr, "do_sigreturn\n"); -#endif - frame = (struct sigframe *) regs->gpr[29]; - if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) - goto badframe; - - for(i = 0; i < TARGET_NSIG_WORDS; i++) { - if(__get_user(target_set.sig[i], &frame->sf_mask.sig[i])) - goto badframe; - } - - target_to_host_sigset_internal(&blocked, &target_set); - sigprocmask(SIG_SETMASK, &blocked, NULL); - - if (restore_sigcontext(regs, &frame->sf_sc)) - goto badframe; - -#if 0 - /* - * Don't let your children do this ... - */ - __asm__ __volatile__( - "move\t$29, %0\n\t" - "j\tsyscall_exit" - :/* no outputs */ - :"r" (®s)); - /* Unreached */ -#endif - - regs->PC = regs->CP0_EPC; - /* I am not sure this is right, but it seems to work - * maybe a problem with nested signals ? */ - regs->CP0_EPC = 0; - return 0; - -badframe: - force_sig(TARGET_SIGSEGV/*, current*/); - return 0; - -} - -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_rt_sigreturn(CPUState *env) -{ - fprintf(stderr, "do_rt_sigreturn: not implemented\n"); - return -ENOSYS; -} - -#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; - - k = sigact_table; - for(sig = 1; sig <= TARGET_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 == 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_internal(&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); -} - - |