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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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#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; |
317 |
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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, CPU_INTERRUPT_EXIT); |
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} |
338 |
} |
339 |
|
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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); |
351 |
#endif
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if (oact) {
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oact->_sa_handler = tswapl(k->sa._sa_handler); |
354 |
oact->sa_flags = tswapl(k->sa.sa_flags); |
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oact->sa_restorer = tswapl(k->sa.sa_restorer); |
356 |
oact->sa_mask = k->sa.sa_mask; |
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} |
358 |
if (act) {
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k->sa._sa_handler = tswapl(act->_sa_handler); |
360 |
k->sa.sa_flags = tswapl(act->sa_flags); |
361 |
k->sa.sa_restorer = tswapl(act->sa_restorer); |
362 |
k->sa.sa_mask = act->sa_mask; |
363 |
} |
364 |
return 0; |
365 |
} |
366 |
|
367 |
#define __put_user(x,ptr)\
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368 |
({\ |
369 |
int size = sizeof(*ptr);\ |
370 |
switch(size) {\
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371 |
case 1:\ |
372 |
stb(ptr, (typeof(*ptr))(x));\ |
373 |
break;\
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374 |
case 2:\ |
375 |
stw(ptr, (typeof(*ptr))(x));\ |
376 |
break;\
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377 |
case 4:\ |
378 |
stl(ptr, (typeof(*ptr))(x));\ |
379 |
break;\
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380 |
case 8:\ |
381 |
stq(ptr, (typeof(*ptr))(x));\ |
382 |
break;\
|
383 |
default:\
|
384 |
abort();\ |
385 |
}\ |
386 |
0;\
|
387 |
}) |
388 |
|
389 |
#define __get_user(x, ptr) \
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390 |
({\ |
391 |
int size = sizeof(*ptr);\ |
392 |
switch(size) {\
|
393 |
case 1:\ |
394 |
x = (typeof(*ptr))ldub(ptr);\ |
395 |
break;\
|
396 |
case 2:\ |
397 |
x = (typeof(*ptr))lduw(ptr);\ |
398 |
break;\
|
399 |
case 4:\ |
400 |
x = (typeof(*ptr))ldl(ptr);\ |
401 |
break;\
|
402 |
case 8:\ |
403 |
x = (typeof(*ptr))ldq(ptr);\ |
404 |
break;\
|
405 |
default:\
|
406 |
abort();\ |
407 |
}\ |
408 |
0;\
|
409 |
}) |
410 |
|
411 |
|
412 |
#define __copy_to_user(dst, src, size)\
|
413 |
({\ |
414 |
memcpy(dst, src, size);\ |
415 |
0;\
|
416 |
}) |
417 |
|
418 |
#define __copy_from_user(dst, src, size)\
|
419 |
({\ |
420 |
memcpy(dst, src, size);\ |
421 |
0;\
|
422 |
}) |
423 |
|
424 |
#define __clear_user(dst, size)\
|
425 |
({\ |
426 |
memset(dst, 0, size);\
|
427 |
0;\
|
428 |
}) |
429 |
|
430 |
#ifndef offsetof
|
431 |
#define offsetof(type, field) ((size_t) &((type *)0)->field) |
432 |
#endif
|
433 |
|
434 |
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, |
435 |
const target_siginfo_t *info)
|
436 |
{ |
437 |
tswap_siginfo(tinfo, info); |
438 |
return 0; |
439 |
} |
440 |
|
441 |
#ifdef TARGET_I386
|
442 |
|
443 |
/* from the Linux kernel */
|
444 |
|
445 |
struct target_fpreg {
|
446 |
uint16_t significand[4];
|
447 |
uint16_t exponent; |
448 |
}; |
449 |
|
450 |
struct target_fpxreg {
|
451 |
uint16_t significand[4];
|
452 |
uint16_t exponent; |
453 |
uint16_t padding[3];
|
454 |
}; |
455 |
|
456 |
struct target_xmmreg {
|
457 |
target_ulong element[4];
|
458 |
}; |
459 |
|
460 |
struct target_fpstate {
|
461 |
/* Regular FPU environment */
|
462 |
target_ulong cw; |
463 |
target_ulong sw; |
464 |
target_ulong tag; |
465 |
target_ulong ipoff; |
466 |
target_ulong cssel; |
467 |
target_ulong dataoff; |
468 |
target_ulong datasel; |
469 |
struct target_fpreg _st[8]; |
470 |
uint16_t status; |
471 |
uint16_t magic; /* 0xffff = regular FPU data only */
|
472 |
|
473 |
/* FXSR FPU environment */
|
474 |
target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ |
475 |
target_ulong mxcsr; |
476 |
target_ulong reserved; |
477 |
struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ |
478 |
struct target_xmmreg _xmm[8]; |
479 |
target_ulong padding[56];
|
480 |
}; |
481 |
|
482 |
#define X86_FXSR_MAGIC 0x0000 |
483 |
|
484 |
struct target_sigcontext {
|
485 |
uint16_t gs, __gsh; |
486 |
uint16_t fs, __fsh; |
487 |
uint16_t es, __esh; |
488 |
uint16_t ds, __dsh; |
489 |
target_ulong edi; |
490 |
target_ulong esi; |
491 |
target_ulong ebp; |
492 |
target_ulong esp; |
493 |
target_ulong ebx; |
494 |
target_ulong edx; |
495 |
target_ulong ecx; |
496 |
target_ulong eax; |
497 |
target_ulong trapno; |
498 |
target_ulong err; |
499 |
target_ulong eip; |
500 |
uint16_t cs, __csh; |
501 |
target_ulong eflags; |
502 |
target_ulong esp_at_signal; |
503 |
uint16_t ss, __ssh; |
504 |
target_ulong fpstate; /* pointer */
|
505 |
target_ulong oldmask; |
506 |
target_ulong cr2; |
507 |
}; |
508 |
|
509 |
typedef struct target_sigaltstack { |
510 |
target_ulong ss_sp; |
511 |
int ss_flags;
|
512 |
target_ulong ss_size; |
513 |
} target_stack_t; |
514 |
|
515 |
struct target_ucontext {
|
516 |
target_ulong uc_flags; |
517 |
target_ulong uc_link; |
518 |
target_stack_t uc_stack; |
519 |
struct target_sigcontext uc_mcontext;
|
520 |
target_sigset_t uc_sigmask; /* mask last for extensibility */
|
521 |
}; |
522 |
|
523 |
struct sigframe
|
524 |
{ |
525 |
target_ulong pretcode; |
526 |
int sig;
|
527 |
struct target_sigcontext sc;
|
528 |
struct target_fpstate fpstate;
|
529 |
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
530 |
char retcode[8]; |
531 |
}; |
532 |
|
533 |
struct rt_sigframe
|
534 |
{ |
535 |
target_ulong pretcode; |
536 |
int sig;
|
537 |
target_ulong pinfo; |
538 |
target_ulong puc; |
539 |
struct target_siginfo info;
|
540 |
struct target_ucontext uc;
|
541 |
struct target_fpstate fpstate;
|
542 |
char retcode[8]; |
543 |
}; |
544 |
|
545 |
/*
|
546 |
* Set up a signal frame.
|
547 |
*/
|
548 |
|
549 |
/* XXX: save x87 state */
|
550 |
static int |
551 |
setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, |
552 |
CPUX86State *env, unsigned long mask) |
553 |
{ |
554 |
int err = 0; |
555 |
|
556 |
err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs); |
557 |
err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs); |
558 |
err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es); |
559 |
err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds); |
560 |
err |= __put_user(env->regs[R_EDI], &sc->edi); |
561 |
err |= __put_user(env->regs[R_ESI], &sc->esi); |
562 |
err |= __put_user(env->regs[R_EBP], &sc->ebp); |
563 |
err |= __put_user(env->regs[R_ESP], &sc->esp); |
564 |
err |= __put_user(env->regs[R_EBX], &sc->ebx); |
565 |
err |= __put_user(env->regs[R_EDX], &sc->edx); |
566 |
err |= __put_user(env->regs[R_ECX], &sc->ecx); |
567 |
err |= __put_user(env->regs[R_EAX], &sc->eax); |
568 |
err |= __put_user(env->exception_index, &sc->trapno); |
569 |
err |= __put_user(env->error_code, &sc->err); |
570 |
err |= __put_user(env->eip, &sc->eip); |
571 |
err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs); |
572 |
err |= __put_user(env->eflags, &sc->eflags); |
573 |
err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); |
574 |
err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss); |
575 |
|
576 |
cpu_x86_fsave(env, (void *)fpstate, 1); |
577 |
fpstate->status = fpstate->sw; |
578 |
err |= __put_user(0xffff, &fpstate->magic);
|
579 |
err |= __put_user(fpstate, &sc->fpstate); |
580 |
|
581 |
/* non-iBCS2 extensions.. */
|
582 |
err |= __put_user(mask, &sc->oldmask); |
583 |
err |= __put_user(env->cr[2], &sc->cr2);
|
584 |
return err;
|
585 |
} |
586 |
|
587 |
/*
|
588 |
* Determine which stack to use..
|
589 |
*/
|
590 |
|
591 |
static inline void * |
592 |
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
|
593 |
{ |
594 |
unsigned long esp; |
595 |
|
596 |
/* Default to using normal stack */
|
597 |
esp = env->regs[R_ESP]; |
598 |
#if 0
|
599 |
/* This is the X/Open sanctioned signal stack switching. */
|
600 |
if (ka->sa.sa_flags & SA_ONSTACK) {
|
601 |
if (sas_ss_flags(esp) == 0)
|
602 |
esp = current->sas_ss_sp + current->sas_ss_size;
|
603 |
}
|
604 |
|
605 |
/* This is the legacy signal stack switching. */
|
606 |
else
|
607 |
#endif
|
608 |
if ((env->segs[R_SS].selector & 0xffff) != __USER_DS && |
609 |
!(ka->sa.sa_flags & TARGET_SA_RESTORER) && |
610 |
ka->sa.sa_restorer) { |
611 |
esp = (unsigned long) ka->sa.sa_restorer; |
612 |
} |
613 |
return (void *)((esp - frame_size) & -8ul); |
614 |
} |
615 |
|
616 |
static void setup_frame(int sig, struct emulated_sigaction *ka, |
617 |
target_sigset_t *set, CPUX86State *env) |
618 |
{ |
619 |
struct sigframe *frame;
|
620 |
int err = 0; |
621 |
|
622 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
623 |
|
624 |
#if 0
|
625 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
626 |
goto give_sigsegv;
|
627 |
#endif
|
628 |
err |= __put_user((/*current->exec_domain
|
629 |
&& current->exec_domain->signal_invmap
|
630 |
&& sig < 32
|
631 |
? current->exec_domain->signal_invmap[sig]
|
632 |
: */ sig),
|
633 |
&frame->sig); |
634 |
if (err)
|
635 |
goto give_sigsegv;
|
636 |
|
637 |
setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
|
638 |
if (err)
|
639 |
goto give_sigsegv;
|
640 |
|
641 |
if (TARGET_NSIG_WORDS > 1) { |
642 |
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
643 |
sizeof(frame->extramask));
|
644 |
} |
645 |
if (err)
|
646 |
goto give_sigsegv;
|
647 |
|
648 |
/* Set up to return from userspace. If provided, use a stub
|
649 |
already in userspace. */
|
650 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
651 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
652 |
} else {
|
653 |
err |= __put_user(frame->retcode, &frame->pretcode); |
654 |
/* This is popl %eax ; movl $,%eax ; int $0x80 */
|
655 |
err |= __put_user(0xb858, (short *)(frame->retcode+0)); |
656 |
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); |
657 |
err |= __put_user(0x80cd, (short *)(frame->retcode+6)); |
658 |
} |
659 |
|
660 |
if (err)
|
661 |
goto give_sigsegv;
|
662 |
|
663 |
/* Set up registers for signal handler */
|
664 |
env->regs[R_ESP] = (unsigned long) frame; |
665 |
env->eip = (unsigned long) ka->sa._sa_handler; |
666 |
|
667 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
668 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
669 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
670 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
671 |
env->eflags &= ~TF_MASK; |
672 |
|
673 |
return;
|
674 |
|
675 |
give_sigsegv:
|
676 |
if (sig == TARGET_SIGSEGV)
|
677 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
678 |
force_sig(TARGET_SIGSEGV /* , current */);
|
679 |
} |
680 |
|
681 |
static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
682 |
target_siginfo_t *info, |
683 |
target_sigset_t *set, CPUX86State *env) |
684 |
{ |
685 |
struct rt_sigframe *frame;
|
686 |
int err = 0; |
687 |
|
688 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
689 |
|
690 |
#if 0
|
691 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
692 |
goto give_sigsegv;
|
693 |
#endif
|
694 |
|
695 |
err |= __put_user((/*current->exec_domain
|
696 |
&& current->exec_domain->signal_invmap
|
697 |
&& sig < 32
|
698 |
? current->exec_domain->signal_invmap[sig]
|
699 |
: */sig),
|
700 |
&frame->sig); |
701 |
err |= __put_user((target_ulong)&frame->info, &frame->pinfo); |
702 |
err |= __put_user((target_ulong)&frame->uc, &frame->puc); |
703 |
err |= copy_siginfo_to_user(&frame->info, info); |
704 |
if (err)
|
705 |
goto give_sigsegv;
|
706 |
|
707 |
/* Create the ucontext. */
|
708 |
err |= __put_user(0, &frame->uc.uc_flags);
|
709 |
err |= __put_user(0, &frame->uc.uc_link);
|
710 |
err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp); |
711 |
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, |
712 |
&frame->uc.uc_stack.ss_flags); |
713 |
err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size); |
714 |
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, |
715 |
env, set->sig[0]);
|
716 |
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
717 |
if (err)
|
718 |
goto give_sigsegv;
|
719 |
|
720 |
/* Set up to return from userspace. If provided, use a stub
|
721 |
already in userspace. */
|
722 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
723 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
724 |
} else {
|
725 |
err |= __put_user(frame->retcode, &frame->pretcode); |
726 |
/* This is movl $,%eax ; int $0x80 */
|
727 |
err |= __put_user(0xb8, (char *)(frame->retcode+0)); |
728 |
err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); |
729 |
err |= __put_user(0x80cd, (short *)(frame->retcode+5)); |
730 |
} |
731 |
|
732 |
if (err)
|
733 |
goto give_sigsegv;
|
734 |
|
735 |
/* Set up registers for signal handler */
|
736 |
env->regs[R_ESP] = (unsigned long) frame; |
737 |
env->eip = (unsigned long) ka->sa._sa_handler; |
738 |
|
739 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
740 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
741 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
742 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
743 |
env->eflags &= ~TF_MASK; |
744 |
|
745 |
return;
|
746 |
|
747 |
give_sigsegv:
|
748 |
if (sig == TARGET_SIGSEGV)
|
749 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
750 |
force_sig(TARGET_SIGSEGV /* , current */);
|
751 |
} |
752 |
|
753 |
static int |
754 |
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) |
755 |
{ |
756 |
unsigned int err = 0; |
757 |
|
758 |
cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); |
759 |
cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); |
760 |
cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); |
761 |
cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); |
762 |
|
763 |
env->regs[R_EDI] = ldl(&sc->edi); |
764 |
env->regs[R_ESI] = ldl(&sc->esi); |
765 |
env->regs[R_EBP] = ldl(&sc->ebp); |
766 |
env->regs[R_ESP] = ldl(&sc->esp); |
767 |
env->regs[R_EBX] = ldl(&sc->ebx); |
768 |
env->regs[R_EDX] = ldl(&sc->edx); |
769 |
env->regs[R_ECX] = ldl(&sc->ecx); |
770 |
env->eip = ldl(&sc->eip); |
771 |
|
772 |
cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
|
773 |
cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
|
774 |
|
775 |
{ |
776 |
unsigned int tmpflags; |
777 |
tmpflags = ldl(&sc->eflags); |
778 |
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); |
779 |
// regs->orig_eax = -1; /* disable syscall checks */
|
780 |
} |
781 |
|
782 |
{ |
783 |
struct _fpstate * buf;
|
784 |
buf = (void *)ldl(&sc->fpstate);
|
785 |
if (buf) {
|
786 |
#if 0
|
787 |
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
|
788 |
goto badframe;
|
789 |
#endif
|
790 |
cpu_x86_frstor(env, (void *)buf, 1); |
791 |
} |
792 |
} |
793 |
|
794 |
*peax = ldl(&sc->eax); |
795 |
return err;
|
796 |
#if 0
|
797 |
badframe:
|
798 |
return 1;
|
799 |
#endif
|
800 |
} |
801 |
|
802 |
long do_sigreturn(CPUX86State *env)
|
803 |
{ |
804 |
struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8); |
805 |
target_sigset_t target_set; |
806 |
sigset_t set; |
807 |
int eax, i;
|
808 |
|
809 |
#if defined(DEBUG_SIGNAL)
|
810 |
fprintf(stderr, "do_sigreturn\n");
|
811 |
#endif
|
812 |
/* set blocked signals */
|
813 |
target_set.sig[0] = frame->sc.oldmask;
|
814 |
for(i = 1; i < TARGET_NSIG_WORDS; i++) |
815 |
target_set.sig[i] = frame->extramask[i - 1];
|
816 |
|
817 |
target_to_host_sigset(&set, &target_set); |
818 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
819 |
|
820 |
/* restore registers */
|
821 |
if (restore_sigcontext(env, &frame->sc, &eax))
|
822 |
goto badframe;
|
823 |
return eax;
|
824 |
|
825 |
badframe:
|
826 |
force_sig(TARGET_SIGSEGV); |
827 |
return 0; |
828 |
} |
829 |
|
830 |
long do_rt_sigreturn(CPUX86State *env)
|
831 |
{ |
832 |
struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4); |
833 |
target_sigset_t target_set; |
834 |
sigset_t set; |
835 |
// stack_t st;
|
836 |
int eax;
|
837 |
|
838 |
#if 0
|
839 |
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
|
840 |
goto badframe;
|
841 |
#endif
|
842 |
memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
|
843 |
|
844 |
target_to_host_sigset(&set, &target_set); |
845 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
846 |
|
847 |
if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
|
848 |
goto badframe;
|
849 |
|
850 |
#if 0
|
851 |
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
|
852 |
goto badframe;
|
853 |
/* It is more difficult to avoid calling this function than to
|
854 |
call it and ignore errors. */
|
855 |
do_sigaltstack(&st, NULL, regs->esp);
|
856 |
#endif
|
857 |
return eax;
|
858 |
|
859 |
badframe:
|
860 |
force_sig(TARGET_SIGSEGV); |
861 |
return 0; |
862 |
} |
863 |
|
864 |
#elif defined(TARGET_ARM)
|
865 |
|
866 |
struct target_sigcontext {
|
867 |
target_ulong trap_no; |
868 |
target_ulong error_code; |
869 |
target_ulong oldmask; |
870 |
target_ulong arm_r0; |
871 |
target_ulong arm_r1; |
872 |
target_ulong arm_r2; |
873 |
target_ulong arm_r3; |
874 |
target_ulong arm_r4; |
875 |
target_ulong arm_r5; |
876 |
target_ulong arm_r6; |
877 |
target_ulong arm_r7; |
878 |
target_ulong arm_r8; |
879 |
target_ulong arm_r9; |
880 |
target_ulong arm_r10; |
881 |
target_ulong arm_fp; |
882 |
target_ulong arm_ip; |
883 |
target_ulong arm_sp; |
884 |
target_ulong arm_lr; |
885 |
target_ulong arm_pc; |
886 |
target_ulong arm_cpsr; |
887 |
target_ulong fault_address; |
888 |
}; |
889 |
|
890 |
typedef struct target_sigaltstack { |
891 |
target_ulong ss_sp; |
892 |
int ss_flags;
|
893 |
target_ulong ss_size; |
894 |
} target_stack_t; |
895 |
|
896 |
struct target_ucontext {
|
897 |
target_ulong uc_flags; |
898 |
target_ulong uc_link; |
899 |
target_stack_t uc_stack; |
900 |
struct target_sigcontext uc_mcontext;
|
901 |
target_sigset_t uc_sigmask; /* mask last for extensibility */
|
902 |
}; |
903 |
|
904 |
struct sigframe
|
905 |
{ |
906 |
struct target_sigcontext sc;
|
907 |
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
908 |
target_ulong retcode; |
909 |
}; |
910 |
|
911 |
struct rt_sigframe
|
912 |
{ |
913 |
struct target_siginfo *pinfo;
|
914 |
void *puc;
|
915 |
struct target_siginfo info;
|
916 |
struct target_ucontext uc;
|
917 |
target_ulong retcode; |
918 |
}; |
919 |
|
920 |
#define TARGET_CONFIG_CPU_32 1 |
921 |
|
922 |
/*
|
923 |
* For ARM syscalls, we encode the syscall number into the instruction.
|
924 |
*/
|
925 |
#define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE)) |
926 |
#define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE)) |
927 |
|
928 |
/*
|
929 |
* For Thumb syscalls, we pass the syscall number via r7. We therefore
|
930 |
* need two 16-bit instructions.
|
931 |
*/
|
932 |
#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn)) |
933 |
#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn)) |
934 |
|
935 |
static const target_ulong retcodes[4] = { |
936 |
SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, |
937 |
SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN |
938 |
}; |
939 |
|
940 |
|
941 |
#define __put_user_error(x,p,e) __put_user(x, p)
|
942 |
#define __get_user_error(x,p,e) __get_user(x, p)
|
943 |
|
944 |
static inline int valid_user_regs(CPUState *regs) |
945 |
{ |
946 |
return 1; |
947 |
} |
948 |
|
949 |
static int |
950 |
setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/ |
951 |
CPUState *env, unsigned long mask) |
952 |
{ |
953 |
int err = 0; |
954 |
|
955 |
__put_user_error(env->regs[0], &sc->arm_r0, err);
|
956 |
__put_user_error(env->regs[1], &sc->arm_r1, err);
|
957 |
__put_user_error(env->regs[2], &sc->arm_r2, err);
|
958 |
__put_user_error(env->regs[3], &sc->arm_r3, err);
|
959 |
__put_user_error(env->regs[4], &sc->arm_r4, err);
|
960 |
__put_user_error(env->regs[5], &sc->arm_r5, err);
|
961 |
__put_user_error(env->regs[6], &sc->arm_r6, err);
|
962 |
__put_user_error(env->regs[7], &sc->arm_r7, err);
|
963 |
__put_user_error(env->regs[8], &sc->arm_r8, err);
|
964 |
__put_user_error(env->regs[9], &sc->arm_r9, err);
|
965 |
__put_user_error(env->regs[10], &sc->arm_r10, err);
|
966 |
__put_user_error(env->regs[11], &sc->arm_fp, err);
|
967 |
__put_user_error(env->regs[12], &sc->arm_ip, err);
|
968 |
__put_user_error(env->regs[13], &sc->arm_sp, err);
|
969 |
__put_user_error(env->regs[14], &sc->arm_lr, err);
|
970 |
__put_user_error(env->regs[15], &sc->arm_pc, err);
|
971 |
#ifdef TARGET_CONFIG_CPU_32
|
972 |
__put_user_error(env->cpsr, &sc->arm_cpsr, err); |
973 |
#endif
|
974 |
|
975 |
__put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err); |
976 |
__put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err); |
977 |
__put_user_error(/* current->thread.address */ 0, &sc->fault_address, err); |
978 |
__put_user_error(mask, &sc->oldmask, err); |
979 |
|
980 |
return err;
|
981 |
} |
982 |
|
983 |
static inline void * |
984 |
get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize) |
985 |
{ |
986 |
unsigned long sp = regs->regs[13]; |
987 |
|
988 |
#if 0
|
989 |
/*
|
990 |
* This is the X/Open sanctioned signal stack switching.
|
991 |
*/
|
992 |
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
|
993 |
sp = current->sas_ss_sp + current->sas_ss_size;
|
994 |
#endif
|
995 |
/*
|
996 |
* ATPCS B01 mandates 8-byte alignment
|
997 |
*/
|
998 |
return (void *)((sp - framesize) & ~7); |
999 |
} |
1000 |
|
1001 |
static int |
1002 |
setup_return(CPUState *env, struct emulated_sigaction *ka,
|
1003 |
target_ulong *rc, void *frame, int usig) |
1004 |
{ |
1005 |
target_ulong handler = (target_ulong)ka->sa._sa_handler; |
1006 |
target_ulong retcode; |
1007 |
int thumb = 0; |
1008 |
#if defined(TARGET_CONFIG_CPU_32)
|
1009 |
target_ulong cpsr = env->cpsr; |
1010 |
|
1011 |
#if 0
|
1012 |
/*
|
1013 |
* Maybe we need to deliver a 32-bit signal to a 26-bit task.
|
1014 |
*/
|
1015 |
if (ka->sa.sa_flags & SA_THIRTYTWO)
|
1016 |
cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
|
1017 |
|
1018 |
#ifdef CONFIG_ARM_THUMB
|
1019 |
if (elf_hwcap & HWCAP_THUMB) {
|
1020 |
/*
|
1021 |
* The LSB of the handler determines if we're going to
|
1022 |
* be using THUMB or ARM mode for this signal handler.
|
1023 |
*/
|
1024 |
thumb = handler & 1;
|
1025 |
|
1026 |
if (thumb)
|
1027 |
cpsr |= T_BIT;
|
1028 |
else
|
1029 |
cpsr &= ~T_BIT;
|
1030 |
}
|
1031 |
#endif
|
1032 |
#endif
|
1033 |
#endif /* TARGET_CONFIG_CPU_32 */ |
1034 |
|
1035 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
1036 |
retcode = (target_ulong)ka->sa.sa_restorer; |
1037 |
} else {
|
1038 |
unsigned int idx = thumb; |
1039 |
|
1040 |
if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
|
1041 |
idx += 2;
|
1042 |
|
1043 |
if (__put_user(retcodes[idx], rc))
|
1044 |
return 1; |
1045 |
#if 0
|
1046 |
flush_icache_range((target_ulong)rc,
|
1047 |
(target_ulong)(rc + 1));
|
1048 |
#endif
|
1049 |
retcode = ((target_ulong)rc) + thumb; |
1050 |
} |
1051 |
|
1052 |
env->regs[0] = usig;
|
1053 |
env->regs[13] = (target_ulong)frame;
|
1054 |
env->regs[14] = retcode;
|
1055 |
env->regs[15] = handler & (thumb ? ~1 : ~3); |
1056 |
|
1057 |
#ifdef TARGET_CONFIG_CPU_32
|
1058 |
env->cpsr = cpsr; |
1059 |
#endif
|
1060 |
|
1061 |
return 0; |
1062 |
} |
1063 |
|
1064 |
static void setup_frame(int usig, struct emulated_sigaction *ka, |
1065 |
target_sigset_t *set, CPUState *regs) |
1066 |
{ |
1067 |
struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame)); |
1068 |
int err = 0; |
1069 |
|
1070 |
err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]); |
1071 |
|
1072 |
if (TARGET_NSIG_WORDS > 1) { |
1073 |
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
1074 |
sizeof(frame->extramask));
|
1075 |
} |
1076 |
|
1077 |
if (err == 0) |
1078 |
err = setup_return(regs, ka, &frame->retcode, frame, usig); |
1079 |
// return err;
|
1080 |
} |
1081 |
|
1082 |
static void setup_rt_frame(int usig, struct emulated_sigaction *ka, |
1083 |
target_siginfo_t *info, |
1084 |
target_sigset_t *set, CPUState *env) |
1085 |
{ |
1086 |
struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame)); |
1087 |
int err = 0; |
1088 |
|
1089 |
#if 0
|
1090 |
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
|
1091 |
return 1;
|
1092 |
#endif
|
1093 |
__put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err); |
1094 |
__put_user_error(&frame->uc, (target_ulong *)&frame->puc, err); |
1095 |
err |= copy_siginfo_to_user(&frame->info, info); |
1096 |
|
1097 |
/* Clear all the bits of the ucontext we don't use. */
|
1098 |
err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
|
1099 |
|
1100 |
err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
|
1101 |
env, set->sig[0]);
|
1102 |
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
1103 |
|
1104 |
if (err == 0) |
1105 |
err = setup_return(env, ka, &frame->retcode, frame, usig); |
1106 |
|
1107 |
if (err == 0) { |
1108 |
/*
|
1109 |
* For realtime signals we must also set the second and third
|
1110 |
* arguments for the signal handler.
|
1111 |
* -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
|
1112 |
*/
|
1113 |
env->regs[1] = (target_ulong)frame->pinfo;
|
1114 |
env->regs[2] = (target_ulong)frame->puc;
|
1115 |
} |
1116 |
|
1117 |
// return err;
|
1118 |
} |
1119 |
|
1120 |
static int |
1121 |
restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
|
1122 |
{ |
1123 |
int err = 0; |
1124 |
|
1125 |
__get_user_error(env->regs[0], &sc->arm_r0, err);
|
1126 |
__get_user_error(env->regs[1], &sc->arm_r1, err);
|
1127 |
__get_user_error(env->regs[2], &sc->arm_r2, err);
|
1128 |
__get_user_error(env->regs[3], &sc->arm_r3, err);
|
1129 |
__get_user_error(env->regs[4], &sc->arm_r4, err);
|
1130 |
__get_user_error(env->regs[5], &sc->arm_r5, err);
|
1131 |
__get_user_error(env->regs[6], &sc->arm_r6, err);
|
1132 |
__get_user_error(env->regs[7], &sc->arm_r7, err);
|
1133 |
__get_user_error(env->regs[8], &sc->arm_r8, err);
|
1134 |
__get_user_error(env->regs[9], &sc->arm_r9, err);
|
1135 |
__get_user_error(env->regs[10], &sc->arm_r10, err);
|
1136 |
__get_user_error(env->regs[11], &sc->arm_fp, err);
|
1137 |
__get_user_error(env->regs[12], &sc->arm_ip, err);
|
1138 |
__get_user_error(env->regs[13], &sc->arm_sp, err);
|
1139 |
__get_user_error(env->regs[14], &sc->arm_lr, err);
|
1140 |
__get_user_error(env->regs[15], &sc->arm_pc, err);
|
1141 |
#ifdef TARGET_CONFIG_CPU_32
|
1142 |
__get_user_error(env->cpsr, &sc->arm_cpsr, err); |
1143 |
#endif
|
1144 |
|
1145 |
err |= !valid_user_regs(env); |
1146 |
|
1147 |
return err;
|
1148 |
} |
1149 |
|
1150 |
long do_sigreturn(CPUState *env)
|
1151 |
{ |
1152 |
struct sigframe *frame;
|
1153 |
target_sigset_t set; |
1154 |
sigset_t host_set; |
1155 |
|
1156 |
/*
|
1157 |
* Since we stacked the signal on a 64-bit boundary,
|
1158 |
* then 'sp' should be word aligned here. If it's
|
1159 |
* not, then the user is trying to mess with us.
|
1160 |
*/
|
1161 |
if (env->regs[13] & 7) |
1162 |
goto badframe;
|
1163 |
|
1164 |
frame = (struct sigframe *)env->regs[13]; |
1165 |
|
1166 |
#if 0
|
1167 |
if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
|
1168 |
goto badframe;
|
1169 |
#endif
|
1170 |
if (__get_user(set.sig[0], &frame->sc.oldmask) |
1171 |
|| (TARGET_NSIG_WORDS > 1
|
1172 |
&& __copy_from_user(&set.sig[1], &frame->extramask,
|
1173 |
sizeof(frame->extramask))))
|
1174 |
goto badframe;
|
1175 |
|
1176 |
target_to_host_sigset(&host_set, &set); |
1177 |
sigprocmask(SIG_SETMASK, &host_set, NULL);
|
1178 |
|
1179 |
if (restore_sigcontext(env, &frame->sc))
|
1180 |
goto badframe;
|
1181 |
|
1182 |
#if 0
|
1183 |
/* Send SIGTRAP if we're single-stepping */
|
1184 |
if (ptrace_cancel_bpt(current))
|
1185 |
send_sig(SIGTRAP, current, 1);
|
1186 |
#endif
|
1187 |
return env->regs[0]; |
1188 |
|
1189 |
badframe:
|
1190 |
force_sig(SIGSEGV /* , current */);
|
1191 |
return 0; |
1192 |
} |
1193 |
|
1194 |
long do_rt_sigreturn(CPUState *env)
|
1195 |
{ |
1196 |
struct rt_sigframe *frame;
|
1197 |
target_sigset_t set; |
1198 |
sigset_t host_set; |
1199 |
|
1200 |
/*
|
1201 |
* Since we stacked the signal on a 64-bit boundary,
|
1202 |
* then 'sp' should be word aligned here. If it's
|
1203 |
* not, then the user is trying to mess with us.
|
1204 |
*/
|
1205 |
if (env->regs[13] & 7) |
1206 |
goto badframe;
|
1207 |
|
1208 |
frame = (struct rt_sigframe *)env->regs[13]; |
1209 |
|
1210 |
#if 0
|
1211 |
if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
|
1212 |
goto badframe;
|
1213 |
#endif
|
1214 |
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
1215 |
goto badframe;
|
1216 |
|
1217 |
target_to_host_sigset(&host_set, &set); |
1218 |
sigprocmask(SIG_SETMASK, &host_set, NULL);
|
1219 |
|
1220 |
if (restore_sigcontext(env, &frame->uc.uc_mcontext))
|
1221 |
goto badframe;
|
1222 |
|
1223 |
#if 0
|
1224 |
/* Send SIGTRAP if we're single-stepping */
|
1225 |
if (ptrace_cancel_bpt(current))
|
1226 |
send_sig(SIGTRAP, current, 1);
|
1227 |
#endif
|
1228 |
return env->regs[0]; |
1229 |
|
1230 |
badframe:
|
1231 |
force_sig(SIGSEGV /* , current */);
|
1232 |
return 0; |
1233 |
} |
1234 |
|
1235 |
#else
|
1236 |
|
1237 |
static void setup_frame(int sig, struct emulated_sigaction *ka, |
1238 |
target_sigset_t *set, CPUState *env) |
1239 |
{ |
1240 |
fprintf(stderr, "setup_frame: not implemented\n");
|
1241 |
} |
1242 |
|
1243 |
static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
1244 |
target_siginfo_t *info, |
1245 |
target_sigset_t *set, CPUState *env) |
1246 |
{ |
1247 |
fprintf(stderr, "setup_rt_frame: not implemented\n");
|
1248 |
} |
1249 |
|
1250 |
long do_sigreturn(CPUState *env)
|
1251 |
{ |
1252 |
fprintf(stderr, "do_sigreturn: not implemented\n");
|
1253 |
return -ENOSYS;
|
1254 |
} |
1255 |
|
1256 |
long do_rt_sigreturn(CPUState *env)
|
1257 |
{ |
1258 |
fprintf(stderr, "do_rt_sigreturn: not implemented\n");
|
1259 |
return -ENOSYS;
|
1260 |
} |
1261 |
|
1262 |
#endif
|
1263 |
|
1264 |
void process_pending_signals(void *cpu_env) |
1265 |
{ |
1266 |
int sig;
|
1267 |
target_ulong handler; |
1268 |
sigset_t set, old_set; |
1269 |
target_sigset_t target_old_set; |
1270 |
struct emulated_sigaction *k;
|
1271 |
struct sigqueue *q;
|
1272 |
|
1273 |
if (!signal_pending)
|
1274 |
return;
|
1275 |
|
1276 |
k = sigact_table; |
1277 |
for(sig = 1; sig <= TARGET_NSIG; sig++) { |
1278 |
if (k->pending)
|
1279 |
goto handle_signal;
|
1280 |
k++; |
1281 |
} |
1282 |
/* if no signal is pending, just return */
|
1283 |
signal_pending = 0;
|
1284 |
return;
|
1285 |
|
1286 |
handle_signal:
|
1287 |
#ifdef DEBUG_SIGNAL
|
1288 |
fprintf(stderr, "qemu: process signal %d\n", sig);
|
1289 |
#endif
|
1290 |
/* dequeue signal */
|
1291 |
q = k->first; |
1292 |
k->first = q->next; |
1293 |
if (!k->first)
|
1294 |
k->pending = 0;
|
1295 |
|
1296 |
handler = k->sa._sa_handler; |
1297 |
if (handler == TARGET_SIG_DFL) {
|
1298 |
/* default handler : ignore some signal. The other are fatal */
|
1299 |
if (sig != TARGET_SIGCHLD &&
|
1300 |
sig != TARGET_SIGURG && |
1301 |
sig != TARGET_SIGWINCH) { |
1302 |
force_sig(sig); |
1303 |
} |
1304 |
} else if (handler == TARGET_SIG_IGN) { |
1305 |
/* ignore sig */
|
1306 |
} else if (handler == TARGET_SIG_ERR) { |
1307 |
force_sig(sig); |
1308 |
} else {
|
1309 |
/* compute the blocked signals during the handler execution */
|
1310 |
target_to_host_sigset(&set, &k->sa.sa_mask); |
1311 |
/* SA_NODEFER indicates that the current signal should not be
|
1312 |
blocked during the handler */
|
1313 |
if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
|
1314 |
sigaddset(&set, target_to_host_signal(sig)); |
1315 |
|
1316 |
/* block signals in the handler using Linux */
|
1317 |
sigprocmask(SIG_BLOCK, &set, &old_set); |
1318 |
/* save the previous blocked signal state to restore it at the
|
1319 |
end of the signal execution (see do_sigreturn) */
|
1320 |
host_to_target_sigset(&target_old_set, &old_set); |
1321 |
|
1322 |
/* if the CPU is in VM86 mode, we restore the 32 bit values */
|
1323 |
#ifdef TARGET_I386
|
1324 |
{ |
1325 |
CPUX86State *env = cpu_env; |
1326 |
if (env->eflags & VM_MASK)
|
1327 |
save_v86_state(env); |
1328 |
} |
1329 |
#endif
|
1330 |
/* prepare the stack frame of the virtual CPU */
|
1331 |
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
|
1332 |
setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env); |
1333 |
else
|
1334 |
setup_frame(sig, k, &target_old_set, cpu_env); |
1335 |
if (k->sa.sa_flags & TARGET_SA_RESETHAND)
|
1336 |
k->sa._sa_handler = TARGET_SIG_DFL; |
1337 |
} |
1338 |
if (q != &k->info)
|
1339 |
free_sigqueue(q); |
1340 |
} |
1341 |
|
1342 |
|