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/*
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* Emulation of Linux signals
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <stdarg.h> |
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#include <unistd.h> |
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#include <signal.h> |
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#include <errno.h> |
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#include <sys/ucontext.h> |
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|
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#ifdef __ia64__
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#undef uc_mcontext
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#undef uc_sigmask
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#undef uc_stack
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#undef uc_link
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#endif
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#include "qemu.h" |
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|
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//#define DEBUG_SIGNAL
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#define MAX_SIGQUEUE_SIZE 1024 |
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struct sigqueue {
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struct sigqueue *next;
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target_siginfo_t info; |
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}; |
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|
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struct emulated_sigaction {
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struct target_sigaction sa;
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int pending; /* true if signal is pending */ |
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struct sigqueue *first;
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struct sigqueue info; /* in order to always have memory for the |
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first signal, we put it here */
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}; |
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|
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static struct emulated_sigaction sigact_table[TARGET_NSIG]; |
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static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */ |
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static struct sigqueue *first_free; /* first free siginfo queue entry */ |
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static int signal_pending; /* non zero if a signal may be pending */ |
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static void host_signal_handler(int host_signum, siginfo_t *info, |
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void *puc);
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|
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/* XXX: do it properly */
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static inline int host_to_target_signal(int sig) |
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{
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return sig;
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} |
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|
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static inline int target_to_host_signal(int sig) |
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{
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return sig;
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} |
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void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
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{
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int i;
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for(i = 0;i < TARGET_NSIG_WORDS; i++) { |
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d->sig[i] = tswapl(((unsigned long *)s)[i]); |
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} |
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} |
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|
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void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
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{
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int i;
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for(i = 0;i < TARGET_NSIG_WORDS; i++) { |
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((unsigned long *)d)[i] = tswapl(s->sig[i]); |
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} |
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} |
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|
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void host_to_target_old_sigset(target_ulong *old_sigset,
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const sigset_t *sigset)
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{
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*old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff); |
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} |
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|
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void target_to_host_old_sigset(sigset_t *sigset,
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const target_ulong *old_sigset)
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{
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sigemptyset(sigset); |
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*(unsigned long *)sigset = tswapl(*old_sigset); |
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} |
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/* siginfo conversion */
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static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, |
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const siginfo_t *info)
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{
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int sig;
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sig = host_to_target_signal(info->si_signo); |
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tinfo->si_signo = sig; |
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tinfo->si_errno = 0;
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tinfo->si_code = 0;
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if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
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/* should never come here, but who knows. The information for
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the target is irrelevant */
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tinfo->_sifields._sigfault._addr = 0;
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} else if (sig >= TARGET_SIGRTMIN) { |
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tinfo->_sifields._rt._pid = info->si_pid; |
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tinfo->_sifields._rt._uid = info->si_uid; |
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/* XXX: potential problem if 64 bit */
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tinfo->_sifields._rt._sigval.sival_ptr = |
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(target_ulong)info->si_value.sival_ptr; |
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} |
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} |
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static void tswap_siginfo(target_siginfo_t *tinfo, |
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const target_siginfo_t *info)
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{
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int sig;
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sig = info->si_signo; |
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tinfo->si_signo = tswap32(sig); |
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tinfo->si_errno = tswap32(info->si_errno); |
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tinfo->si_code = tswap32(info->si_code); |
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if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
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tinfo->_sifields._sigfault._addr = |
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tswapl(info->_sifields._sigfault._addr); |
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} else if (sig >= TARGET_SIGRTMIN) { |
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tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid); |
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tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid); |
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tinfo->_sifields._rt._sigval.sival_ptr = |
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tswapl(info->_sifields._rt._sigval.sival_ptr); |
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} |
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} |
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void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) |
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{
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host_to_target_siginfo_noswap(tinfo, info); |
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tswap_siginfo(tinfo, tinfo); |
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} |
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/* XXX: we support only POSIX RT signals are used. */
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/* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
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void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo) |
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{
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info->si_signo = tswap32(tinfo->si_signo); |
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info->si_errno = tswap32(tinfo->si_errno); |
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info->si_code = tswap32(tinfo->si_code); |
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info->si_pid = tswap32(tinfo->_sifields._rt._pid); |
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info->si_uid = tswap32(tinfo->_sifields._rt._uid); |
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info->si_value.sival_ptr = |
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(void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
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} |
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void signal_init(void) |
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{
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struct sigaction act;
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int i;
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/* set all host signal handlers. ALL signals are blocked during
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the handlers to serialize them. */
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sigfillset(&act.sa_mask); |
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act.sa_flags = SA_SIGINFO; |
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act.sa_sigaction = host_signal_handler; |
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for(i = 1; i < NSIG; i++) { |
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sigaction(i, &act, NULL);
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} |
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memset(sigact_table, 0, sizeof(sigact_table)); |
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first_free = &sigqueue_table[0];
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for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) |
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sigqueue_table[i].next = &sigqueue_table[i + 1];
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sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL; |
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} |
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/* signal queue handling */
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static inline struct sigqueue *alloc_sigqueue(void) |
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{
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struct sigqueue *q = first_free;
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if (!q)
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return NULL; |
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first_free = q->next; |
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return q;
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} |
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static inline void free_sigqueue(struct sigqueue *q) |
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{
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q->next = first_free; |
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first_free = q; |
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} |
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/* abort execution with signal */
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void __attribute((noreturn)) force_sig(int sig) |
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{
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int host_sig;
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host_sig = target_to_host_signal(sig); |
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fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
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sig, strsignal(host_sig)); |
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#if 1 |
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_exit(-host_sig); |
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#else
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{
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struct sigaction act;
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sigemptyset(&act.sa_mask); |
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act.sa_flags = SA_SIGINFO; |
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act.sa_sigaction = SIG_DFL; |
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sigaction(SIGABRT, &act, NULL);
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abort(); |
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} |
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#endif
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} |
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/* queue a signal so that it will be send to the virtual CPU as soon
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as possible */
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int queue_signal(int sig, target_siginfo_t *info) |
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{
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struct emulated_sigaction *k;
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struct sigqueue *q, **pq;
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target_ulong handler; |
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#if defined(DEBUG_SIGNAL)
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fprintf(stderr, "queue_signal: sig=%d\n",
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sig); |
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#endif
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k = &sigact_table[sig - 1];
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handler = k->sa._sa_handler; |
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if (handler == TARGET_SIG_DFL) {
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/* default handler : ignore some signal. The other are fatal */
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if (sig != TARGET_SIGCHLD &&
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sig != TARGET_SIGURG && |
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sig != TARGET_SIGWINCH) {
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force_sig(sig); |
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} else {
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return 0; /* indicate ignored */ |
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} |
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} else if (handler == TARGET_SIG_IGN) { |
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/* ignore signal */
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return 0; |
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} else if (handler == TARGET_SIG_ERR) { |
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force_sig(sig); |
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} else {
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pq = &k->first; |
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if (sig < TARGET_SIGRTMIN) {
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/* if non real time signal, we queue exactly one signal */
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if (!k->pending)
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q = &k->info; |
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else
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return 0; |
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} else {
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if (!k->pending) {
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/* first signal */
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q = &k->info; |
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} else {
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q = alloc_sigqueue(); |
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if (!q)
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return -EAGAIN;
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while (*pq != NULL) |
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pq = &(*pq)->next; |
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} |
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} |
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*pq = q; |
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q->info = *info; |
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q->next = NULL;
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k->pending = 1;
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/* signal that a new signal is pending */
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signal_pending = 1;
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return 1; /* indicates that the signal was queued */ |
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} |
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} |
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#if defined(DEBUG_SIGNAL)
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#ifdef __i386__
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static void dump_regs(struct ucontext *uc) |
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{
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fprintf(stderr, |
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"EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
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"ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
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"EFL=%08x EIP=%08x\n",
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uc->uc_mcontext.gregs[EAX], |
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uc->uc_mcontext.gregs[EBX], |
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uc->uc_mcontext.gregs[ECX], |
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uc->uc_mcontext.gregs[EDX], |
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uc->uc_mcontext.gregs[ESI], |
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uc->uc_mcontext.gregs[EDI], |
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uc->uc_mcontext.gregs[EBP], |
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uc->uc_mcontext.gregs[ESP], |
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uc->uc_mcontext.gregs[EFL], |
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uc->uc_mcontext.gregs[EIP]); |
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} |
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#else
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static void dump_regs(struct ucontext *uc) |
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{
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} |
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#endif
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#endif
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static void host_signal_handler(int host_signum, siginfo_t *info, |
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void *puc)
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{
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int sig;
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target_siginfo_t tinfo; |
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|
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/* the CPU emulator uses some host signals to detect exceptions,
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we we forward to it some signals */
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if (host_signum == SIGSEGV || host_signum == SIGBUS) {
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if (cpu_x86_signal_handler(host_signum, info, puc))
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return;
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} |
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/* get target signal number */
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sig = host_to_target_signal(host_signum); |
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if (sig < 1 || sig > TARGET_NSIG) |
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return;
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#if defined(DEBUG_SIGNAL)
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fprintf(stderr, "qemu: got signal %d\n", sig);
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dump_regs(puc); |
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#endif
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host_to_target_siginfo_noswap(&tinfo, info); |
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if (queue_signal(sig, &tinfo) == 1) { |
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/* interrupt the virtual CPU as soon as possible */
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cpu_x86_interrupt(global_env); |
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} |
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} |
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|
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int do_sigaction(int sig, const struct target_sigaction *act, |
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struct target_sigaction *oact)
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{
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struct emulated_sigaction *k;
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|
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if (sig < 1 || sig > TARGET_NSIG) |
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return -EINVAL;
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k = &sigact_table[sig - 1];
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#if defined(DEBUG_SIGNAL) && 0 |
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fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
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sig, (int)act, (int)oact); |
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#endif
|
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if (oact) {
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oact->_sa_handler = tswapl(k->sa._sa_handler); |
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oact->sa_flags = tswapl(k->sa.sa_flags); |
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oact->sa_restorer = tswapl(k->sa.sa_restorer); |
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oact->sa_mask = k->sa.sa_mask; |
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} |
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if (act) {
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k->sa._sa_handler = tswapl(act->_sa_handler); |
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k->sa.sa_flags = tswapl(act->sa_flags); |
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k->sa.sa_restorer = tswapl(act->sa_restorer); |
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k->sa.sa_mask = act->sa_mask; |
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} |
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return 0; |
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} |
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|
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#ifdef TARGET_I386
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|
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/* from the Linux kernel */
|
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|
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struct target_fpreg {
|
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uint16_t significand[4];
|
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uint16_t exponent; |
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}; |
| 373 |
|
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struct target_fpxreg {
|
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uint16_t significand[4];
|
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uint16_t exponent; |
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uint16_t padding[3];
|
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}; |
| 379 |
|
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struct target_xmmreg {
|
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target_ulong element[4];
|
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}; |
| 383 |
|
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struct target_fpstate {
|
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/* Regular FPU environment */
|
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target_ulong cw; |
| 387 |
target_ulong sw; |
| 388 |
target_ulong tag; |
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target_ulong ipoff; |
| 390 |
target_ulong cssel; |
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target_ulong dataoff; |
| 392 |
target_ulong datasel; |
| 393 |
struct target_fpreg _st[8]; |
| 394 |
uint16_t status; |
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uint16_t magic; /* 0xffff = regular FPU data only */
|
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|
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/* FXSR FPU environment */
|
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target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ |
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target_ulong mxcsr; |
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target_ulong reserved; |
| 401 |
struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ |
| 402 |
struct target_xmmreg _xmm[8]; |
| 403 |
target_ulong padding[56];
|
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}; |
| 405 |
|
| 406 |
#define X86_FXSR_MAGIC 0x0000 |
| 407 |
|
| 408 |
struct target_sigcontext {
|
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uint16_t gs, __gsh; |
| 410 |
uint16_t fs, __fsh; |
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uint16_t es, __esh; |
| 412 |
uint16_t ds, __dsh; |
| 413 |
target_ulong edi; |
| 414 |
target_ulong esi; |
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target_ulong ebp; |
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target_ulong esp; |
| 417 |
target_ulong ebx; |
| 418 |
target_ulong edx; |
| 419 |
target_ulong ecx; |
| 420 |
target_ulong eax; |
| 421 |
target_ulong trapno; |
| 422 |
target_ulong err; |
| 423 |
target_ulong eip; |
| 424 |
uint16_t cs, __csh; |
| 425 |
target_ulong eflags; |
| 426 |
target_ulong esp_at_signal; |
| 427 |
uint16_t ss, __ssh; |
| 428 |
target_ulong fpstate; /* pointer */
|
| 429 |
target_ulong oldmask; |
| 430 |
target_ulong cr2; |
| 431 |
}; |
| 432 |
|
| 433 |
typedef struct target_sigaltstack { |
| 434 |
target_ulong ss_sp; |
| 435 |
int ss_flags;
|
| 436 |
target_ulong ss_size; |
| 437 |
} target_stack_t; |
| 438 |
|
| 439 |
struct target_ucontext {
|
| 440 |
target_ulong uc_flags; |
| 441 |
target_ulong uc_link; |
| 442 |
target_stack_t uc_stack; |
| 443 |
struct target_sigcontext uc_mcontext;
|
| 444 |
target_sigset_t uc_sigmask; /* mask last for extensibility */
|
| 445 |
}; |
| 446 |
|
| 447 |
struct sigframe
|
| 448 |
{
|
| 449 |
target_ulong pretcode; |
| 450 |
int sig;
|
| 451 |
struct target_sigcontext sc;
|
| 452 |
struct target_fpstate fpstate;
|
| 453 |
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
| 454 |
char retcode[8]; |
| 455 |
}; |
| 456 |
|
| 457 |
struct rt_sigframe
|
| 458 |
{
|
| 459 |
target_ulong pretcode; |
| 460 |
int sig;
|
| 461 |
target_ulong pinfo; |
| 462 |
target_ulong puc; |
| 463 |
struct target_siginfo info;
|
| 464 |
struct target_ucontext uc;
|
| 465 |
struct target_fpstate fpstate;
|
| 466 |
char retcode[8]; |
| 467 |
}; |
| 468 |
|
| 469 |
/*
|
| 470 |
* Set up a signal frame.
|
| 471 |
*/
|
| 472 |
|
| 473 |
#define __put_user(x,ptr)\
|
| 474 |
({\
|
| 475 |
int size = sizeof(*ptr);\ |
| 476 |
switch(size) {\
|
| 477 |
case 1:\ |
| 478 |
stb(ptr, (typeof(*ptr))(x));\ |
| 479 |
break;\
|
| 480 |
case 2:\ |
| 481 |
stw(ptr, (typeof(*ptr))(x));\ |
| 482 |
break;\
|
| 483 |
case 4:\ |
| 484 |
stl(ptr, (typeof(*ptr))(x));\ |
| 485 |
break;\
|
| 486 |
case 8:\ |
| 487 |
stq(ptr, (typeof(*ptr))(x));\ |
| 488 |
break;\
|
| 489 |
default:\
|
| 490 |
abort();\ |
| 491 |
}\ |
| 492 |
0;\
|
| 493 |
}) |
| 494 |
|
| 495 |
#define get_user(val, ptr) (typeof(*ptr))(*(ptr))
|
| 496 |
|
| 497 |
|
| 498 |
#define __copy_to_user(dst, src, size)\
|
| 499 |
({\
|
| 500 |
memcpy(dst, src, size);\ |
| 501 |
0;\
|
| 502 |
}) |
| 503 |
|
| 504 |
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, |
| 505 |
const target_siginfo_t *info)
|
| 506 |
{
|
| 507 |
tswap_siginfo(tinfo, info); |
| 508 |
return 0; |
| 509 |
} |
| 510 |
|
| 511 |
/* XXX: save x87 state */
|
| 512 |
static int |
| 513 |
setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, |
| 514 |
CPUX86State *env, unsigned long mask) |
| 515 |
{
|
| 516 |
int err = 0; |
| 517 |
|
| 518 |
err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs); |
| 519 |
err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs); |
| 520 |
err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es); |
| 521 |
err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds); |
| 522 |
err |= __put_user(env->regs[R_EDI], &sc->edi); |
| 523 |
err |= __put_user(env->regs[R_ESI], &sc->esi); |
| 524 |
err |= __put_user(env->regs[R_EBP], &sc->ebp); |
| 525 |
err |= __put_user(env->regs[R_ESP], &sc->esp); |
| 526 |
err |= __put_user(env->regs[R_EBX], &sc->ebx); |
| 527 |
err |= __put_user(env->regs[R_EDX], &sc->edx); |
| 528 |
err |= __put_user(env->regs[R_ECX], &sc->ecx); |
| 529 |
err |= __put_user(env->regs[R_EAX], &sc->eax); |
| 530 |
err |= __put_user(/*current->thread.trap_no*/ 0, &sc->trapno); |
| 531 |
err |= __put_user(/*current->thread.error_code*/ 0, &sc->err); |
| 532 |
err |= __put_user(env->eip, &sc->eip); |
| 533 |
err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs); |
| 534 |
err |= __put_user(env->eflags, &sc->eflags); |
| 535 |
err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); |
| 536 |
err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss); |
| 537 |
#if 0
|
| 538 |
tmp = save_i387(fpstate);
|
| 539 |
if (tmp < 0)
|
| 540 |
err = 1;
|
| 541 |
else
|
| 542 |
err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
|
| 543 |
#else
|
| 544 |
err |= __put_user(0, &sc->fpstate);
|
| 545 |
#endif
|
| 546 |
/* non-iBCS2 extensions.. */
|
| 547 |
err |= __put_user(mask, &sc->oldmask); |
| 548 |
err |= __put_user(/*current->thread.cr2*/ 0, &sc->cr2); |
| 549 |
return err;
|
| 550 |
} |
| 551 |
|
| 552 |
/*
|
| 553 |
* Determine which stack to use..
|
| 554 |
*/
|
| 555 |
|
| 556 |
static inline void * |
| 557 |
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
|
| 558 |
{
|
| 559 |
unsigned long esp; |
| 560 |
|
| 561 |
/* Default to using normal stack */
|
| 562 |
esp = env->regs[R_ESP]; |
| 563 |
#if 0
|
| 564 |
/* This is the X/Open sanctioned signal stack switching. */
|
| 565 |
if (ka->sa.sa_flags & SA_ONSTACK) {
|
| 566 |
if (sas_ss_flags(esp) == 0)
|
| 567 |
esp = current->sas_ss_sp + current->sas_ss_size;
|
| 568 |
}
|
| 569 |
|
| 570 |
/* This is the legacy signal stack switching. */
|
| 571 |
else if ((regs->xss & 0xffff) != __USER_DS &&
|
| 572 |
!(ka->sa.sa_flags & SA_RESTORER) &&
|
| 573 |
ka->sa.sa_restorer) {
|
| 574 |
esp = (unsigned long) ka->sa.sa_restorer;
|
| 575 |
}
|
| 576 |
#endif
|
| 577 |
return (void *)((esp - frame_size) & -8ul); |
| 578 |
} |
| 579 |
|
| 580 |
static void setup_frame(int sig, struct emulated_sigaction *ka, |
| 581 |
target_sigset_t *set, CPUX86State *env) |
| 582 |
{
|
| 583 |
struct sigframe *frame;
|
| 584 |
int err = 0; |
| 585 |
|
| 586 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
| 587 |
|
| 588 |
#if 0
|
| 589 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
| 590 |
goto give_sigsegv;
|
| 591 |
#endif
|
| 592 |
err |= __put_user((/*current->exec_domain
|
| 593 |
&& current->exec_domain->signal_invmap
|
| 594 |
&& sig < 32
|
| 595 |
? current->exec_domain->signal_invmap[sig]
|
| 596 |
: */ sig),
|
| 597 |
&frame->sig); |
| 598 |
if (err)
|
| 599 |
goto give_sigsegv;
|
| 600 |
|
| 601 |
setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
|
| 602 |
if (err)
|
| 603 |
goto give_sigsegv;
|
| 604 |
|
| 605 |
if (TARGET_NSIG_WORDS > 1) { |
| 606 |
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
| 607 |
sizeof(frame->extramask));
|
| 608 |
} |
| 609 |
if (err)
|
| 610 |
goto give_sigsegv;
|
| 611 |
|
| 612 |
/* Set up to return from userspace. If provided, use a stub
|
| 613 |
already in userspace. */
|
| 614 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
| 615 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
| 616 |
} else {
|
| 617 |
err |= __put_user(frame->retcode, &frame->pretcode); |
| 618 |
/* This is popl %eax ; movl $,%eax ; int $0x80 */
|
| 619 |
err |= __put_user(0xb858, (short *)(frame->retcode+0)); |
| 620 |
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); |
| 621 |
err |= __put_user(0x80cd, (short *)(frame->retcode+6)); |
| 622 |
} |
| 623 |
|
| 624 |
if (err)
|
| 625 |
goto give_sigsegv;
|
| 626 |
|
| 627 |
/* Set up registers for signal handler */
|
| 628 |
env->regs[R_ESP] = (unsigned long) frame; |
| 629 |
env->eip = (unsigned long) ka->sa._sa_handler; |
| 630 |
|
| 631 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
| 632 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
| 633 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
| 634 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
| 635 |
env->eflags &= ~TF_MASK; |
| 636 |
|
| 637 |
return;
|
| 638 |
|
| 639 |
give_sigsegv:
|
| 640 |
if (sig == TARGET_SIGSEGV)
|
| 641 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
| 642 |
force_sig(TARGET_SIGSEGV /* , current */);
|
| 643 |
} |
| 644 |
|
| 645 |
static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
| 646 |
target_siginfo_t *info, |
| 647 |
target_sigset_t *set, CPUX86State *env) |
| 648 |
{
|
| 649 |
struct rt_sigframe *frame;
|
| 650 |
int err = 0; |
| 651 |
|
| 652 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
| 653 |
|
| 654 |
#if 0
|
| 655 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
| 656 |
goto give_sigsegv;
|
| 657 |
#endif
|
| 658 |
|
| 659 |
err |= __put_user((/*current->exec_domain
|
| 660 |
&& current->exec_domain->signal_invmap
|
| 661 |
&& sig < 32
|
| 662 |
? current->exec_domain->signal_invmap[sig]
|
| 663 |
: */sig),
|
| 664 |
&frame->sig); |
| 665 |
err |= __put_user((target_ulong)&frame->info, &frame->pinfo); |
| 666 |
err |= __put_user((target_ulong)&frame->uc, &frame->puc); |
| 667 |
err |= copy_siginfo_to_user(&frame->info, info); |
| 668 |
if (err)
|
| 669 |
goto give_sigsegv;
|
| 670 |
|
| 671 |
/* Create the ucontext. */
|
| 672 |
err |= __put_user(0, &frame->uc.uc_flags);
|
| 673 |
err |= __put_user(0, &frame->uc.uc_link);
|
| 674 |
err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp); |
| 675 |
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, |
| 676 |
&frame->uc.uc_stack.ss_flags); |
| 677 |
err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size); |
| 678 |
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, |
| 679 |
env, set->sig[0]);
|
| 680 |
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
| 681 |
if (err)
|
| 682 |
goto give_sigsegv;
|
| 683 |
|
| 684 |
/* Set up to return from userspace. If provided, use a stub
|
| 685 |
already in userspace. */
|
| 686 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
| 687 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
| 688 |
} else {
|
| 689 |
err |= __put_user(frame->retcode, &frame->pretcode); |
| 690 |
/* This is movl $,%eax ; int $0x80 */
|
| 691 |
err |= __put_user(0xb8, (char *)(frame->retcode+0)); |
| 692 |
err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); |
| 693 |
err |= __put_user(0x80cd, (short *)(frame->retcode+5)); |
| 694 |
} |
| 695 |
|
| 696 |
if (err)
|
| 697 |
goto give_sigsegv;
|
| 698 |
|
| 699 |
/* Set up registers for signal handler */
|
| 700 |
env->regs[R_ESP] = (unsigned long) frame; |
| 701 |
env->eip = (unsigned long) ka->sa._sa_handler; |
| 702 |
|
| 703 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
| 704 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
| 705 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
| 706 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
| 707 |
env->eflags &= ~TF_MASK; |
| 708 |
|
| 709 |
return;
|
| 710 |
|
| 711 |
give_sigsegv:
|
| 712 |
if (sig == TARGET_SIGSEGV)
|
| 713 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
| 714 |
force_sig(TARGET_SIGSEGV /* , current */);
|
| 715 |
} |
| 716 |
|
| 717 |
static int |
| 718 |
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) |
| 719 |
{
|
| 720 |
unsigned int err = 0; |
| 721 |
|
| 722 |
|
| 723 |
|
| 724 |
#define COPY(x) err |= __get_user(regs->x, &sc->x)
|
| 725 |
|
| 726 |
#define COPY_SEG(seg) \
|
| 727 |
{ unsigned short tmp; \
|
| 728 |
err |= __get_user(tmp, &sc->seg); \ |
| 729 |
regs->x##seg = tmp; } |
| 730 |
|
| 731 |
#define COPY_SEG_STRICT(seg) \
|
| 732 |
{ unsigned short tmp; \
|
| 733 |
err |= __get_user(tmp, &sc->seg); \ |
| 734 |
regs->x##seg = tmp|3; } |
| 735 |
|
| 736 |
#define GET_SEG(seg) \
|
| 737 |
{ unsigned short tmp; \
|
| 738 |
err |= __get_user(tmp, &sc->seg); \ |
| 739 |
loadsegment(seg,tmp); } |
| 740 |
|
| 741 |
cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); |
| 742 |
cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); |
| 743 |
cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); |
| 744 |
cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); |
| 745 |
|
| 746 |
env->regs[R_EDI] = ldl(&sc->edi); |
| 747 |
env->regs[R_ESI] = ldl(&sc->esi); |
| 748 |
env->regs[R_EBP] = ldl(&sc->ebp); |
| 749 |
env->regs[R_ESP] = ldl(&sc->esp); |
| 750 |
env->regs[R_EBX] = ldl(&sc->ebx); |
| 751 |
env->regs[R_EDX] = ldl(&sc->edx); |
| 752 |
env->regs[R_ECX] = ldl(&sc->ecx); |
| 753 |
env->eip = ldl(&sc->eip); |
| 754 |
|
| 755 |
cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
|
| 756 |
cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
|
| 757 |
|
| 758 |
{
|
| 759 |
unsigned int tmpflags; |
| 760 |
tmpflags = ldl(&sc->eflags); |
| 761 |
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); |
| 762 |
// regs->orig_eax = -1; /* disable syscall checks */
|
| 763 |
} |
| 764 |
|
| 765 |
#if 0
|
| 766 |
{
|
| 767 |
struct _fpstate * buf;
|
| 768 |
err |= __get_user(buf, &sc->fpstate);
|
| 769 |
if (buf) {
|
| 770 |
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
|
| 771 |
goto badframe;
|
| 772 |
err |= restore_i387(buf);
|
| 773 |
}
|
| 774 |
}
|
| 775 |
#endif
|
| 776 |
*peax = ldl(&sc->eax); |
| 777 |
return err;
|
| 778 |
#if 0
|
| 779 |
badframe:
|
| 780 |
return 1;
|
| 781 |
#endif
|
| 782 |
} |
| 783 |
|
| 784 |
long do_sigreturn(CPUX86State *env)
|
| 785 |
{
|
| 786 |
struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8); |
| 787 |
target_sigset_t target_set; |
| 788 |
sigset_t set; |
| 789 |
int eax, i;
|
| 790 |
|
| 791 |
/* set blocked signals */
|
| 792 |
target_set.sig[0] = frame->sc.oldmask;
|
| 793 |
for(i = 1; i < TARGET_NSIG_WORDS; i++) |
| 794 |
target_set.sig[i] = frame->extramask[i - 1];
|
| 795 |
|
| 796 |
target_to_host_sigset(&set, &target_set); |
| 797 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
| 798 |
|
| 799 |
/* restore registers */
|
| 800 |
if (restore_sigcontext(env, &frame->sc, &eax))
|
| 801 |
goto badframe;
|
| 802 |
return eax;
|
| 803 |
|
| 804 |
badframe:
|
| 805 |
force_sig(TARGET_SIGSEGV); |
| 806 |
return 0; |
| 807 |
} |
| 808 |
|
| 809 |
long do_rt_sigreturn(CPUX86State *env)
|
| 810 |
{
|
| 811 |
struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4); |
| 812 |
target_sigset_t target_set; |
| 813 |
sigset_t set; |
| 814 |
// stack_t st;
|
| 815 |
int eax;
|
| 816 |
|
| 817 |
#if 0
|
| 818 |
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
|
| 819 |
goto badframe;
|
| 820 |
#endif
|
| 821 |
memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
|
| 822 |
|
| 823 |
target_to_host_sigset(&set, &target_set); |
| 824 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
| 825 |
|
| 826 |
if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
|
| 827 |
goto badframe;
|
| 828 |
|
| 829 |
#if 0
|
| 830 |
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
|
| 831 |
goto badframe;
|
| 832 |
/* It is more difficult to avoid calling this function than to
|
| 833 |
call it and ignore errors. */
|
| 834 |
do_sigaltstack(&st, NULL, regs->esp);
|
| 835 |
#endif
|
| 836 |
return eax;
|
| 837 |
|
| 838 |
badframe:
|
| 839 |
force_sig(TARGET_SIGSEGV); |
| 840 |
return 0; |
| 841 |
} |
| 842 |
|
| 843 |
#endif
|
| 844 |
|
| 845 |
void process_pending_signals(void *cpu_env) |
| 846 |
{
|
| 847 |
int sig;
|
| 848 |
target_ulong handler; |
| 849 |
sigset_t set, old_set; |
| 850 |
target_sigset_t target_old_set; |
| 851 |
struct emulated_sigaction *k;
|
| 852 |
struct sigqueue *q;
|
| 853 |
|
| 854 |
if (!signal_pending)
|
| 855 |
return;
|
| 856 |
|
| 857 |
k = sigact_table; |
| 858 |
for(sig = 1; sig <= TARGET_NSIG; sig++) { |
| 859 |
if (k->pending)
|
| 860 |
goto handle_signal;
|
| 861 |
k++; |
| 862 |
} |
| 863 |
/* if no signal is pending, just return */
|
| 864 |
signal_pending = 0;
|
| 865 |
return;
|
| 866 |
|
| 867 |
handle_signal:
|
| 868 |
#ifdef DEBUG_SIGNAL
|
| 869 |
fprintf(stderr, "qemu: process signal %d\n", sig);
|
| 870 |
#endif
|
| 871 |
/* dequeue signal */
|
| 872 |
q = k->first; |
| 873 |
k->first = q->next; |
| 874 |
if (!k->first)
|
| 875 |
k->pending = 0;
|
| 876 |
|
| 877 |
handler = k->sa._sa_handler; |
| 878 |
if (handler == TARGET_SIG_DFL) {
|
| 879 |
/* default handler : ignore some signal. The other are fatal */
|
| 880 |
if (sig != TARGET_SIGCHLD &&
|
| 881 |
sig != TARGET_SIGURG && |
| 882 |
sig != TARGET_SIGWINCH) {
|
| 883 |
force_sig(sig); |
| 884 |
} |
| 885 |
} else if (handler == TARGET_SIG_IGN) { |
| 886 |
/* ignore sig */
|
| 887 |
} else if (handler == TARGET_SIG_ERR) { |
| 888 |
force_sig(sig); |
| 889 |
} else {
|
| 890 |
/* compute the blocked signals during the handler execution */
|
| 891 |
target_to_host_sigset(&set, &k->sa.sa_mask); |
| 892 |
/* SA_NODEFER indicates that the current signal should not be
|
| 893 |
blocked during the handler */
|
| 894 |
if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
|
| 895 |
sigaddset(&set, target_to_host_signal(sig)); |
| 896 |
|
| 897 |
/* block signals in the handler using Linux */
|
| 898 |
sigprocmask(SIG_BLOCK, &set, &old_set); |
| 899 |
/* save the previous blocked signal state to restore it at the
|
| 900 |
end of the signal execution (see do_sigreturn) */
|
| 901 |
host_to_target_sigset(&target_old_set, &old_set); |
| 902 |
|
| 903 |
/* if the CPU is in VM86 mode, we restore the 32 bit values */
|
| 904 |
#ifdef TARGET_I386
|
| 905 |
{
|
| 906 |
CPUX86State *env = cpu_env; |
| 907 |
if (env->eflags & VM_MASK)
|
| 908 |
save_v86_state(env); |
| 909 |
} |
| 910 |
#endif
|
| 911 |
/* prepare the stack frame of the virtual CPU */
|
| 912 |
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
|
| 913 |
setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env); |
| 914 |
else
|
| 915 |
setup_frame(sig, k, &target_old_set, cpu_env); |
| 916 |
if (k->sa.sa_flags & TARGET_SA_RESETHAND)
|
| 917 |
k->sa._sa_handler = TARGET_SIG_DFL; |
| 918 |
} |
| 919 |
if (q != &k->info)
|
| 920 |
free_sigqueue(q); |
| 921 |
} |
| 922 |
|
| 923 |
|