git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@256 c046a42c-6fe2-441c-8c8c-71466251a162
936 lines
25 KiB
C
936 lines
25 KiB
C
/*
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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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#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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//#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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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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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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/* 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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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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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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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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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 ||
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sig == SIGBUS || sig == SIGTRAP) {
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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 ||
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sig == SIGBUS || sig == SIGTRAP) {
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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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/* 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_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_interrupt(global_env);
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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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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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#ifdef TARGET_I386
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/* from the Linux kernel */
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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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};
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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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};
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struct target_xmmreg {
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target_ulong element[4];
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};
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struct target_fpstate {
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/* Regular FPU environment */
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target_ulong cw;
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target_ulong sw;
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target_ulong tag;
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target_ulong ipoff;
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target_ulong cssel;
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target_ulong dataoff;
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target_ulong datasel;
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struct target_fpreg _st[8];
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uint16_t status;
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uint16_t magic; /* 0xffff = regular FPU data only */
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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;
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struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
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struct target_xmmreg _xmm[8];
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target_ulong padding[56];
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};
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#define X86_FXSR_MAGIC 0x0000
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struct target_sigcontext {
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uint16_t gs, __gsh;
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uint16_t fs, __fsh;
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uint16_t es, __esh;
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uint16_t ds, __dsh;
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target_ulong edi;
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target_ulong esi;
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target_ulong ebp;
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target_ulong esp;
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target_ulong ebx;
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target_ulong edx;
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target_ulong ecx;
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target_ulong eax;
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target_ulong trapno;
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target_ulong err;
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target_ulong eip;
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uint16_t cs, __csh;
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target_ulong eflags;
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target_ulong esp_at_signal;
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uint16_t ss, __ssh;
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target_ulong fpstate; /* pointer */
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target_ulong oldmask;
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target_ulong cr2;
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};
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typedef struct target_sigaltstack {
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target_ulong ss_sp;
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int ss_flags;
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target_ulong ss_size;
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} target_stack_t;
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struct target_ucontext {
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target_ulong uc_flags;
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target_ulong uc_link;
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target_stack_t uc_stack;
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struct target_sigcontext uc_mcontext;
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target_sigset_t uc_sigmask; /* mask last for extensibility */
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};
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struct sigframe
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{
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target_ulong pretcode;
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int sig;
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struct target_sigcontext sc;
|
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struct target_fpstate fpstate;
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target_ulong extramask[TARGET_NSIG_WORDS-1];
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char retcode[8];
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};
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|
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struct rt_sigframe
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{
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target_ulong pretcode;
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int sig;
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target_ulong pinfo;
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target_ulong puc;
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struct target_siginfo info;
|
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struct target_ucontext uc;
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struct target_fpstate fpstate;
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char retcode[8];
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};
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|
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/*
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* Set up a signal frame.
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*/
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|
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#define __put_user(x,ptr)\
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({\
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int size = sizeof(*ptr);\
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switch(size) {\
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|
case 1:\
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stb(ptr, (typeof(*ptr))(x));\
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break;\
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case 2:\
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stw(ptr, (typeof(*ptr))(x));\
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break;\
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case 4:\
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stl(ptr, (typeof(*ptr))(x));\
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break;\
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case 8:\
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stq(ptr, (typeof(*ptr))(x));\
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break;\
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default:\
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abort();\
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}\
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0;\
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})
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|
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#define get_user(val, ptr) (typeof(*ptr))(*(ptr))
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|
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|
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#define __copy_to_user(dst, src, size)\
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({\
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memcpy(dst, src, size);\
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0;\
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})
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|
|
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo,
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const target_siginfo_t *info)
|
|
{
|
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tswap_siginfo(tinfo, info);
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return 0;
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}
|
|
|
|
/* XXX: save x87 state */
|
|
static int
|
|
setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate,
|
|
CPUX86State *env, unsigned long mask)
|
|
{
|
|
int err = 0;
|
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|
|
err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs);
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|
err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs);
|
|
err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es);
|
|
err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds);
|
|
err |= __put_user(env->regs[R_EDI], &sc->edi);
|
|
err |= __put_user(env->regs[R_ESI], &sc->esi);
|
|
err |= __put_user(env->regs[R_EBP], &sc->ebp);
|
|
err |= __put_user(env->regs[R_ESP], &sc->esp);
|
|
err |= __put_user(env->regs[R_EBX], &sc->ebx);
|
|
err |= __put_user(env->regs[R_EDX], &sc->edx);
|
|
err |= __put_user(env->regs[R_ECX], &sc->ecx);
|
|
err |= __put_user(env->regs[R_EAX], &sc->eax);
|
|
err |= __put_user(env->exception_index, &sc->trapno);
|
|
err |= __put_user(env->error_code, &sc->err);
|
|
err |= __put_user(env->eip, &sc->eip);
|
|
err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs);
|
|
err |= __put_user(env->eflags, &sc->eflags);
|
|
err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal);
|
|
err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss);
|
|
|
|
cpu_x86_fsave(env, (void *)fpstate, 1);
|
|
fpstate->status = fpstate->sw;
|
|
err |= __put_user(0xffff, &fpstate->magic);
|
|
err |= __put_user(fpstate, &sc->fpstate);
|
|
|
|
/* non-iBCS2 extensions.. */
|
|
err |= __put_user(mask, &sc->oldmask);
|
|
err |= __put_user(env->cr[2], &sc->cr2);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Determine which stack to use..
|
|
*/
|
|
|
|
static inline void *
|
|
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
|
|
{
|
|
unsigned long esp;
|
|
|
|
/* Default to using normal stack */
|
|
esp = env->regs[R_ESP];
|
|
#if 0
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if (ka->sa.sa_flags & SA_ONSTACK) {
|
|
if (sas_ss_flags(esp) == 0)
|
|
esp = current->sas_ss_sp + current->sas_ss_size;
|
|
}
|
|
|
|
/* This is the legacy signal stack switching. */
|
|
else
|
|
#endif
|
|
if ((env->segs[R_SS].selector & 0xffff) != __USER_DS &&
|
|
!(ka->sa.sa_flags & TARGET_SA_RESTORER) &&
|
|
ka->sa.sa_restorer) {
|
|
esp = (unsigned long) ka->sa.sa_restorer;
|
|
}
|
|
return (void *)((esp - frame_size) & -8ul);
|
|
}
|
|
|
|
static void setup_frame(int sig, struct emulated_sigaction *ka,
|
|
target_sigset_t *set, CPUX86State *env)
|
|
{
|
|
struct sigframe *frame;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ka, env, sizeof(*frame));
|
|
|
|
#if 0
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
goto give_sigsegv;
|
|
#endif
|
|
err |= __put_user((/*current->exec_domain
|
|
&& current->exec_domain->signal_invmap
|
|
&& sig < 32
|
|
? current->exec_domain->signal_invmap[sig]
|
|
: */ sig),
|
|
&frame->sig);
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
if (TARGET_NSIG_WORDS > 1) {
|
|
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
|
sizeof(frame->extramask));
|
|
}
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
already in userspace. */
|
|
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
|
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
|
|
} else {
|
|
err |= __put_user(frame->retcode, &frame->pretcode);
|
|
/* This is popl %eax ; movl $,%eax ; int $0x80 */
|
|
err |= __put_user(0xb858, (short *)(frame->retcode+0));
|
|
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2));
|
|
err |= __put_user(0x80cd, (short *)(frame->retcode+6));
|
|
}
|
|
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
env->regs[R_ESP] = (unsigned long) frame;
|
|
env->eip = (unsigned long) ka->sa._sa_handler;
|
|
|
|
cpu_x86_load_seg(env, R_DS, __USER_DS);
|
|
cpu_x86_load_seg(env, R_ES, __USER_DS);
|
|
cpu_x86_load_seg(env, R_SS, __USER_DS);
|
|
cpu_x86_load_seg(env, R_CS, __USER_CS);
|
|
env->eflags &= ~TF_MASK;
|
|
|
|
return;
|
|
|
|
give_sigsegv:
|
|
if (sig == TARGET_SIGSEGV)
|
|
ka->sa._sa_handler = TARGET_SIG_DFL;
|
|
force_sig(TARGET_SIGSEGV /* , current */);
|
|
}
|
|
|
|
static void setup_rt_frame(int sig, struct emulated_sigaction *ka,
|
|
target_siginfo_t *info,
|
|
target_sigset_t *set, CPUX86State *env)
|
|
{
|
|
struct rt_sigframe *frame;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ka, env, sizeof(*frame));
|
|
|
|
#if 0
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
goto give_sigsegv;
|
|
#endif
|
|
|
|
err |= __put_user((/*current->exec_domain
|
|
&& current->exec_domain->signal_invmap
|
|
&& sig < 32
|
|
? current->exec_domain->signal_invmap[sig]
|
|
: */sig),
|
|
&frame->sig);
|
|
err |= __put_user((target_ulong)&frame->info, &frame->pinfo);
|
|
err |= __put_user((target_ulong)&frame->uc, &frame->puc);
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(0, &frame->uc.uc_link);
|
|
err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp);
|
|
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0,
|
|
&frame->uc.uc_stack.ss_flags);
|
|
err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size);
|
|
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
|
|
env, set->sig[0]);
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
already in userspace. */
|
|
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
|
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
|
|
} else {
|
|
err |= __put_user(frame->retcode, &frame->pretcode);
|
|
/* This is movl $,%eax ; int $0x80 */
|
|
err |= __put_user(0xb8, (char *)(frame->retcode+0));
|
|
err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1));
|
|
err |= __put_user(0x80cd, (short *)(frame->retcode+5));
|
|
}
|
|
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
env->regs[R_ESP] = (unsigned long) frame;
|
|
env->eip = (unsigned long) ka->sa._sa_handler;
|
|
|
|
cpu_x86_load_seg(env, R_DS, __USER_DS);
|
|
cpu_x86_load_seg(env, R_ES, __USER_DS);
|
|
cpu_x86_load_seg(env, R_SS, __USER_DS);
|
|
cpu_x86_load_seg(env, R_CS, __USER_CS);
|
|
env->eflags &= ~TF_MASK;
|
|
|
|
return;
|
|
|
|
give_sigsegv:
|
|
if (sig == TARGET_SIGSEGV)
|
|
ka->sa._sa_handler = TARGET_SIG_DFL;
|
|
force_sig(TARGET_SIGSEGV /* , current */);
|
|
}
|
|
|
|
static int
|
|
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax)
|
|
{
|
|
unsigned int err = 0;
|
|
|
|
cpu_x86_load_seg(env, R_GS, lduw(&sc->gs));
|
|
cpu_x86_load_seg(env, R_FS, lduw(&sc->fs));
|
|
cpu_x86_load_seg(env, R_ES, lduw(&sc->es));
|
|
cpu_x86_load_seg(env, R_DS, lduw(&sc->ds));
|
|
|
|
env->regs[R_EDI] = ldl(&sc->edi);
|
|
env->regs[R_ESI] = ldl(&sc->esi);
|
|
env->regs[R_EBP] = ldl(&sc->ebp);
|
|
env->regs[R_ESP] = ldl(&sc->esp);
|
|
env->regs[R_EBX] = ldl(&sc->ebx);
|
|
env->regs[R_EDX] = ldl(&sc->edx);
|
|
env->regs[R_ECX] = ldl(&sc->ecx);
|
|
env->eip = ldl(&sc->eip);
|
|
|
|
cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
|
|
cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
|
|
|
|
{
|
|
unsigned int tmpflags;
|
|
tmpflags = ldl(&sc->eflags);
|
|
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
|
|
// regs->orig_eax = -1; /* disable syscall checks */
|
|
}
|
|
|
|
{
|
|
struct _fpstate * buf;
|
|
buf = (void *)ldl(&sc->fpstate);
|
|
if (buf) {
|
|
#if 0
|
|
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
|
|
goto badframe;
|
|
#endif
|
|
cpu_x86_frstor(env, (void *)buf, 1);
|
|
}
|
|
}
|
|
|
|
*peax = ldl(&sc->eax);
|
|
return err;
|
|
#if 0
|
|
badframe:
|
|
return 1;
|
|
#endif
|
|
}
|
|
|
|
long do_sigreturn(CPUX86State *env)
|
|
{
|
|
struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8);
|
|
target_sigset_t target_set;
|
|
sigset_t set;
|
|
int eax, i;
|
|
|
|
#if defined(DEBUG_SIGNAL)
|
|
fprintf(stderr, "do_sigreturn\n");
|
|
#endif
|
|
/* set blocked signals */
|
|
target_set.sig[0] = frame->sc.oldmask;
|
|
for(i = 1; i < TARGET_NSIG_WORDS; i++)
|
|
target_set.sig[i] = frame->extramask[i - 1];
|
|
|
|
target_to_host_sigset(&set, &target_set);
|
|
sigprocmask(SIG_SETMASK, &set, NULL);
|
|
|
|
/* restore registers */
|
|
if (restore_sigcontext(env, &frame->sc, &eax))
|
|
goto badframe;
|
|
return eax;
|
|
|
|
badframe:
|
|
force_sig(TARGET_SIGSEGV);
|
|
return 0;
|
|
}
|
|
|
|
long do_rt_sigreturn(CPUX86State *env)
|
|
{
|
|
struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4);
|
|
target_sigset_t target_set;
|
|
sigset_t set;
|
|
// stack_t st;
|
|
int eax;
|
|
|
|
#if 0
|
|
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
|
|
goto badframe;
|
|
#endif
|
|
memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
|
|
|
|
target_to_host_sigset(&set, &target_set);
|
|
sigprocmask(SIG_SETMASK, &set, NULL);
|
|
|
|
if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
|
|
goto badframe;
|
|
|
|
#if 0
|
|
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
|
|
goto badframe;
|
|
/* It is more difficult to avoid calling this function than to
|
|
call it and ignore errors. */
|
|
do_sigaltstack(&st, NULL, regs->esp);
|
|
#endif
|
|
return eax;
|
|
|
|
badframe:
|
|
force_sig(TARGET_SIGSEGV);
|
|
return 0;
|
|
}
|
|
|
|
#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;
|
|
|
|
handler = k->sa._sa_handler;
|
|
if (handler == TARGET_SIG_DFL) {
|
|
/* default handler : ignore some signal. The other are fatal */
|
|
if (sig != TARGET_SIGCHLD &&
|
|
sig != TARGET_SIGURG &&
|
|
sig != TARGET_SIGWINCH) {
|
|
force_sig(sig);
|
|
}
|
|
} else if (handler == TARGET_SIG_IGN) {
|
|
/* ignore sig */
|
|
} else if (handler == TARGET_SIG_ERR) {
|
|
force_sig(sig);
|
|
} else {
|
|
/* compute the blocked signals during the handler execution */
|
|
target_to_host_sigset(&set, &k->sa.sa_mask);
|
|
/* SA_NODEFER indicates that the current signal should not be
|
|
blocked during the handler */
|
|
if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
|
|
sigaddset(&set, target_to_host_signal(sig));
|
|
|
|
/* block signals in the handler using Linux */
|
|
sigprocmask(SIG_BLOCK, &set, &old_set);
|
|
/* save the previous blocked signal state to restore it at the
|
|
end of the signal execution (see do_sigreturn) */
|
|
host_to_target_sigset(&target_old_set, &old_set);
|
|
|
|
/* if the CPU is in VM86 mode, we restore the 32 bit values */
|
|
#ifdef TARGET_I386
|
|
{
|
|
CPUX86State *env = cpu_env;
|
|
if (env->eflags & VM_MASK)
|
|
save_v86_state(env);
|
|
}
|
|
#endif
|
|
/* prepare the stack frame of the virtual CPU */
|
|
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
|
|
setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env);
|
|
else
|
|
setup_frame(sig, k, &target_old_set, cpu_env);
|
|
if (k->sa.sa_flags & TARGET_SA_RESETHAND)
|
|
k->sa._sa_handler = TARGET_SIG_DFL;
|
|
}
|
|
if (q != &k->info)
|
|
free_sigqueue(q);
|
|
}
|
|
|
|
|