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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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//#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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|
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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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|
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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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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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|
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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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|
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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_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); |
349 |
#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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} |
356 |
if (act) {
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k->sa._sa_handler = tswapl(act->_sa_handler); |
358 |
k->sa.sa_flags = tswapl(act->sa_flags); |
359 |
k->sa.sa_restorer = tswapl(act->sa_restorer); |
360 |
k->sa.sa_mask = act->sa_mask; |
361 |
} |
362 |
return 0; |
363 |
} |
364 |
|
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#ifdef TARGET_I386
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366 |
|
367 |
/* from the Linux kernel */
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368 |
|
369 |
struct target_fpreg {
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uint16_t significand[4];
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uint16_t exponent; |
372 |
}; |
373 |
|
374 |
struct target_fpxreg {
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uint16_t significand[4];
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uint16_t exponent; |
377 |
uint16_t padding[3];
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378 |
}; |
379 |
|
380 |
struct target_xmmreg {
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381 |
target_ulong element[4];
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}; |
383 |
|
384 |
struct target_fpstate {
|
385 |
/* Regular FPU environment */
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386 |
target_ulong cw; |
387 |
target_ulong sw; |
388 |
target_ulong tag; |
389 |
target_ulong ipoff; |
390 |
target_ulong cssel; |
391 |
target_ulong dataoff; |
392 |
target_ulong datasel; |
393 |
struct target_fpreg _st[8]; |
394 |
uint16_t status; |
395 |
uint16_t magic; /* 0xffff = regular FPU data only */
|
396 |
|
397 |
/* FXSR FPU environment */
|
398 |
target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ |
399 |
target_ulong mxcsr; |
400 |
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 {
|
409 |
uint16_t gs, __gsh; |
410 |
uint16_t fs, __fsh; |
411 |
uint16_t es, __esh; |
412 |
uint16_t ds, __dsh; |
413 |
target_ulong edi; |
414 |
target_ulong esi; |
415 |
target_ulong ebp; |
416 |
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(env->exception_index, &sc->trapno); |
531 |
err |= __put_user(env->error_code, &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 |
|