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/*
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* Emulation of Linux signals
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <stdarg.h> |
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#include <unistd.h> |
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#include <signal.h> |
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#include <errno.h> |
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#include <sys/ucontext.h> |
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|
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#ifdef __ia64__
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#undef uc_mcontext
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#undef uc_sigmask
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#undef uc_stack
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#undef uc_link
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#endif
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#include "qemu.h" |
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|
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//#define DEBUG_SIGNAL
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#define MAX_SIGQUEUE_SIZE 1024 |
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struct sigqueue {
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struct sigqueue *next;
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target_siginfo_t info; |
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}; |
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|
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struct emulated_sigaction {
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struct target_sigaction sa;
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int pending; /* true if signal is pending */ |
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struct sigqueue *first;
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struct sigqueue info; /* in order to always have memory for the |
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first signal, we put it here */
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}; |
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|
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static struct emulated_sigaction sigact_table[TARGET_NSIG]; |
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static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */ |
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static struct sigqueue *first_free; /* first free siginfo queue entry */ |
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static int signal_pending; /* non zero if a signal may be pending */ |
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|
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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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static uint8_t host_to_target_signal_table[65] = { |
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[SIGHUP] = TARGET_SIGHUP, |
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[SIGINT] = TARGET_SIGINT, |
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[SIGQUIT] = TARGET_SIGQUIT, |
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[SIGILL] = TARGET_SIGILL, |
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[SIGTRAP] = TARGET_SIGTRAP, |
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[SIGABRT] = TARGET_SIGABRT, |
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/* [SIGIOT] = TARGET_SIGIOT,*/
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[SIGBUS] = TARGET_SIGBUS, |
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[SIGFPE] = TARGET_SIGFPE, |
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[SIGKILL] = TARGET_SIGKILL, |
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[SIGUSR1] = TARGET_SIGUSR1, |
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[SIGSEGV] = TARGET_SIGSEGV, |
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[SIGUSR2] = TARGET_SIGUSR2, |
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[SIGPIPE] = TARGET_SIGPIPE, |
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[SIGALRM] = TARGET_SIGALRM, |
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[SIGTERM] = TARGET_SIGTERM, |
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#ifdef SIGSTKFLT
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[SIGSTKFLT] = TARGET_SIGSTKFLT, |
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#endif
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[SIGCHLD] = TARGET_SIGCHLD, |
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[SIGCONT] = TARGET_SIGCONT, |
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[SIGSTOP] = TARGET_SIGSTOP, |
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[SIGTSTP] = TARGET_SIGTSTP, |
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[SIGTTIN] = TARGET_SIGTTIN, |
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[SIGTTOU] = TARGET_SIGTTOU, |
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[SIGURG] = TARGET_SIGURG, |
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[SIGXCPU] = TARGET_SIGXCPU, |
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[SIGXFSZ] = TARGET_SIGXFSZ, |
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[SIGVTALRM] = TARGET_SIGVTALRM, |
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[SIGPROF] = TARGET_SIGPROF, |
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[SIGWINCH] = TARGET_SIGWINCH, |
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[SIGIO] = TARGET_SIGIO, |
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[SIGPWR] = TARGET_SIGPWR, |
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[SIGSYS] = TARGET_SIGSYS, |
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/* next signals stay the same */
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}; |
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static uint8_t target_to_host_signal_table[65]; |
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|
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static inline int host_to_target_signal(int sig) |
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{
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return host_to_target_signal_table[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 target_to_host_signal_table[sig];
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} |
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void host_to_target_sigset(target_sigset_t *d, const sigset_t *s) |
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{
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int i;
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unsigned long sigmask; |
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uint32_t target_sigmask; |
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sigmask = ((unsigned long *)s)[0]; |
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target_sigmask = 0;
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for(i = 0; i < 32; i++) { |
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if (sigmask & (1 << i)) |
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target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1); |
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} |
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#if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32 |
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d->sig[0] = tswapl(target_sigmask);
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for(i = 1;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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#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2 |
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d->sig[0] = tswapl(target_sigmask);
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d->sig[1] = tswapl(sigmask >> 32); |
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#else
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#error host_to_target_sigset
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#endif
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} |
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void target_to_host_sigset(sigset_t *d, const target_sigset_t *s) |
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{
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int i;
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unsigned long sigmask; |
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target_ulong target_sigmask; |
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target_sigmask = tswapl(s->sig[0]);
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sigmask = 0;
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for(i = 0; i < 32; i++) { |
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if (target_sigmask & (1 << i)) |
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sigmask |= 1 << (target_to_host_signal(i + 1) - 1); |
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} |
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#if TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 32 |
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((unsigned long *)d)[0] = sigmask; |
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for(i = 1;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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#elif TARGET_LONG_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2 |
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((unsigned long *)d)[0] = sigmask | ((unsigned long)tswapl(s->sig[1]) << 32); |
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#else
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#error target_to_host_sigset
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#endif /* TARGET_LONG_BITS */ |
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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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target_sigset_t d; |
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host_to_target_sigset(&d, sigset); |
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*old_sigset = d.sig[0];
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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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target_sigset_t d; |
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int i;
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d.sig[0] = *old_sigset;
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for(i = 1;i < TARGET_NSIG_WORDS; i++) |
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d.sig[i] = 0;
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target_to_host_sigset(sigset, &d); |
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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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|
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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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|
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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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|
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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, j;
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|
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/* generate signal conversion tables */
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for(i = 1; i <= 64; i++) { |
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if (host_to_target_signal_table[i] == 0) |
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host_to_target_signal_table[i] = i; |
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} |
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for(i = 1; i <= 64; i++) { |
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j = host_to_target_signal_table[i]; |
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target_to_host_signal_table[j] = i; |
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} |
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|
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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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|
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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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|
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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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|
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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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|
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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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static void host_signal_handler(int host_signum, siginfo_t *info, |
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void *puc)
|
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{
|
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int sig;
|
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target_siginfo_t tinfo; |
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|
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/* the CPU emulator uses some host signals to detect exceptions,
|
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we we forward to it some signals */
|
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if (host_signum == SIGSEGV || host_signum == SIGBUS
|
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#if defined(TARGET_I386) && defined(USE_CODE_COPY)
|
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|| host_signum == SIGFPE |
| 384 |
#endif
|
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) {
|
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if (cpu_signal_handler(host_signum, info, puc))
|
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return;
|
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} |
| 389 |
|
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/* get target signal number */
|
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sig = host_to_target_signal(host_signum); |
| 392 |
if (sig < 1 || sig > TARGET_NSIG) |
| 393 |
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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#endif
|
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host_to_target_siginfo_noswap(&tinfo, info); |
| 398 |
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); |
| 401 |
} |
| 402 |
} |
| 403 |
|
| 404 |
int do_sigaction(int sig, const struct target_sigaction *act, |
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struct target_sigaction *oact)
|
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{
|
| 407 |
struct emulated_sigaction *k;
|
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struct sigaction act1;
|
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int host_sig;
|
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|
| 411 |
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)
|
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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); |
| 417 |
#endif
|
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if (oact) {
|
| 419 |
oact->_sa_handler = tswapl(k->sa._sa_handler); |
| 420 |
oact->sa_flags = tswapl(k->sa.sa_flags); |
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oact->sa_restorer = tswapl(k->sa.sa_restorer); |
| 422 |
oact->sa_mask = k->sa.sa_mask; |
| 423 |
} |
| 424 |
if (act) {
|
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k->sa._sa_handler = tswapl(act->_sa_handler); |
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k->sa.sa_flags = tswapl(act->sa_flags); |
| 427 |
k->sa.sa_restorer = tswapl(act->sa_restorer); |
| 428 |
k->sa.sa_mask = act->sa_mask; |
| 429 |
|
| 430 |
/* we update the host linux signal state */
|
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host_sig = target_to_host_signal(sig); |
| 432 |
if (host_sig != SIGSEGV && host_sig != SIGBUS) {
|
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sigfillset(&act1.sa_mask); |
| 434 |
act1.sa_flags = SA_SIGINFO; |
| 435 |
if (k->sa.sa_flags & TARGET_SA_RESTART)
|
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act1.sa_flags |= SA_RESTART; |
| 437 |
/* NOTE: it is important to update the host kernel signal
|
| 438 |
ignore state to avoid getting unexpected interrupted
|
| 439 |
syscalls */
|
| 440 |
if (k->sa._sa_handler == TARGET_SIG_IGN) {
|
| 441 |
act1.sa_sigaction = (void *)SIG_IGN;
|
| 442 |
} else if (k->sa._sa_handler == TARGET_SIG_DFL) { |
| 443 |
act1.sa_sigaction = (void *)SIG_DFL;
|
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} else {
|
| 445 |
act1.sa_sigaction = host_signal_handler; |
| 446 |
} |
| 447 |
sigaction(host_sig, &act1, NULL);
|
| 448 |
} |
| 449 |
} |
| 450 |
return 0; |
| 451 |
} |
| 452 |
|
| 453 |
#ifndef offsetof
|
| 454 |
#define offsetof(type, field) ((size_t) &((type *)0)->field) |
| 455 |
#endif
|
| 456 |
|
| 457 |
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, |
| 458 |
const target_siginfo_t *info)
|
| 459 |
{
|
| 460 |
tswap_siginfo(tinfo, info); |
| 461 |
return 0; |
| 462 |
} |
| 463 |
|
| 464 |
#ifdef TARGET_I386
|
| 465 |
|
| 466 |
/* from the Linux kernel */
|
| 467 |
|
| 468 |
struct target_fpreg {
|
| 469 |
uint16_t significand[4];
|
| 470 |
uint16_t exponent; |
| 471 |
}; |
| 472 |
|
| 473 |
struct target_fpxreg {
|
| 474 |
uint16_t significand[4];
|
| 475 |
uint16_t exponent; |
| 476 |
uint16_t padding[3];
|
| 477 |
}; |
| 478 |
|
| 479 |
struct target_xmmreg {
|
| 480 |
target_ulong element[4];
|
| 481 |
}; |
| 482 |
|
| 483 |
struct target_fpstate {
|
| 484 |
/* Regular FPU environment */
|
| 485 |
target_ulong cw; |
| 486 |
target_ulong sw; |
| 487 |
target_ulong tag; |
| 488 |
target_ulong ipoff; |
| 489 |
target_ulong cssel; |
| 490 |
target_ulong dataoff; |
| 491 |
target_ulong datasel; |
| 492 |
struct target_fpreg _st[8]; |
| 493 |
uint16_t status; |
| 494 |
uint16_t magic; /* 0xffff = regular FPU data only */
|
| 495 |
|
| 496 |
/* FXSR FPU environment */
|
| 497 |
target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ |
| 498 |
target_ulong mxcsr; |
| 499 |
target_ulong reserved; |
| 500 |
struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ |
| 501 |
struct target_xmmreg _xmm[8]; |
| 502 |
target_ulong padding[56];
|
| 503 |
}; |
| 504 |
|
| 505 |
#define X86_FXSR_MAGIC 0x0000 |
| 506 |
|
| 507 |
struct target_sigcontext {
|
| 508 |
uint16_t gs, __gsh; |
| 509 |
uint16_t fs, __fsh; |
| 510 |
uint16_t es, __esh; |
| 511 |
uint16_t ds, __dsh; |
| 512 |
target_ulong edi; |
| 513 |
target_ulong esi; |
| 514 |
target_ulong ebp; |
| 515 |
target_ulong esp; |
| 516 |
target_ulong ebx; |
| 517 |
target_ulong edx; |
| 518 |
target_ulong ecx; |
| 519 |
target_ulong eax; |
| 520 |
target_ulong trapno; |
| 521 |
target_ulong err; |
| 522 |
target_ulong eip; |
| 523 |
uint16_t cs, __csh; |
| 524 |
target_ulong eflags; |
| 525 |
target_ulong esp_at_signal; |
| 526 |
uint16_t ss, __ssh; |
| 527 |
target_ulong fpstate; /* pointer */
|
| 528 |
target_ulong oldmask; |
| 529 |
target_ulong cr2; |
| 530 |
}; |
| 531 |
|
| 532 |
typedef struct target_sigaltstack { |
| 533 |
target_ulong ss_sp; |
| 534 |
int ss_flags;
|
| 535 |
target_ulong ss_size; |
| 536 |
} target_stack_t; |
| 537 |
|
| 538 |
struct target_ucontext {
|
| 539 |
target_ulong uc_flags; |
| 540 |
target_ulong uc_link; |
| 541 |
target_stack_t uc_stack; |
| 542 |
struct target_sigcontext uc_mcontext;
|
| 543 |
target_sigset_t uc_sigmask; /* mask last for extensibility */
|
| 544 |
}; |
| 545 |
|
| 546 |
struct sigframe
|
| 547 |
{
|
| 548 |
target_ulong pretcode; |
| 549 |
int sig;
|
| 550 |
struct target_sigcontext sc;
|
| 551 |
struct target_fpstate fpstate;
|
| 552 |
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
| 553 |
char retcode[8]; |
| 554 |
}; |
| 555 |
|
| 556 |
struct rt_sigframe
|
| 557 |
{
|
| 558 |
target_ulong pretcode; |
| 559 |
int sig;
|
| 560 |
target_ulong pinfo; |
| 561 |
target_ulong puc; |
| 562 |
struct target_siginfo info;
|
| 563 |
struct target_ucontext uc;
|
| 564 |
struct target_fpstate fpstate;
|
| 565 |
char retcode[8]; |
| 566 |
}; |
| 567 |
|
| 568 |
/*
|
| 569 |
* Set up a signal frame.
|
| 570 |
*/
|
| 571 |
|
| 572 |
/* XXX: save x87 state */
|
| 573 |
static int |
| 574 |
setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, |
| 575 |
CPUX86State *env, unsigned long mask) |
| 576 |
{
|
| 577 |
int err = 0; |
| 578 |
|
| 579 |
err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs); |
| 580 |
err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs); |
| 581 |
err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es); |
| 582 |
err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds); |
| 583 |
err |= __put_user(env->regs[R_EDI], &sc->edi); |
| 584 |
err |= __put_user(env->regs[R_ESI], &sc->esi); |
| 585 |
err |= __put_user(env->regs[R_EBP], &sc->ebp); |
| 586 |
err |= __put_user(env->regs[R_ESP], &sc->esp); |
| 587 |
err |= __put_user(env->regs[R_EBX], &sc->ebx); |
| 588 |
err |= __put_user(env->regs[R_EDX], &sc->edx); |
| 589 |
err |= __put_user(env->regs[R_ECX], &sc->ecx); |
| 590 |
err |= __put_user(env->regs[R_EAX], &sc->eax); |
| 591 |
err |= __put_user(env->exception_index, &sc->trapno); |
| 592 |
err |= __put_user(env->error_code, &sc->err); |
| 593 |
err |= __put_user(env->eip, &sc->eip); |
| 594 |
err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs); |
| 595 |
err |= __put_user(env->eflags, &sc->eflags); |
| 596 |
err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); |
| 597 |
err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss); |
| 598 |
|
| 599 |
cpu_x86_fsave(env, (void *)fpstate, 1); |
| 600 |
fpstate->status = fpstate->sw; |
| 601 |
err |= __put_user(0xffff, &fpstate->magic);
|
| 602 |
err |= __put_user(fpstate, &sc->fpstate); |
| 603 |
|
| 604 |
/* non-iBCS2 extensions.. */
|
| 605 |
err |= __put_user(mask, &sc->oldmask); |
| 606 |
err |= __put_user(env->cr[2], &sc->cr2);
|
| 607 |
return err;
|
| 608 |
} |
| 609 |
|
| 610 |
/*
|
| 611 |
* Determine which stack to use..
|
| 612 |
*/
|
| 613 |
|
| 614 |
static inline void * |
| 615 |
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
|
| 616 |
{
|
| 617 |
unsigned long esp; |
| 618 |
|
| 619 |
/* Default to using normal stack */
|
| 620 |
esp = env->regs[R_ESP]; |
| 621 |
#if 0
|
| 622 |
/* This is the X/Open sanctioned signal stack switching. */
|
| 623 |
if (ka->sa.sa_flags & SA_ONSTACK) {
|
| 624 |
if (sas_ss_flags(esp) == 0)
|
| 625 |
esp = current->sas_ss_sp + current->sas_ss_size;
|
| 626 |
}
|
| 627 |
|
| 628 |
/* This is the legacy signal stack switching. */
|
| 629 |
else
|
| 630 |
#endif
|
| 631 |
if ((env->segs[R_SS].selector & 0xffff) != __USER_DS && |
| 632 |
!(ka->sa.sa_flags & TARGET_SA_RESTORER) && |
| 633 |
ka->sa.sa_restorer) {
|
| 634 |
esp = (unsigned long) ka->sa.sa_restorer; |
| 635 |
} |
| 636 |
return (void *)((esp - frame_size) & -8ul); |
| 637 |
} |
| 638 |
|
| 639 |
static void setup_frame(int sig, struct emulated_sigaction *ka, |
| 640 |
target_sigset_t *set, CPUX86State *env) |
| 641 |
{
|
| 642 |
struct sigframe *frame;
|
| 643 |
int err = 0; |
| 644 |
|
| 645 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
| 646 |
|
| 647 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 648 |
goto give_sigsegv;
|
| 649 |
err |= __put_user((/*current->exec_domain
|
| 650 |
&& current->exec_domain->signal_invmap
|
| 651 |
&& sig < 32
|
| 652 |
? current->exec_domain->signal_invmap[sig]
|
| 653 |
: */ sig),
|
| 654 |
&frame->sig); |
| 655 |
if (err)
|
| 656 |
goto give_sigsegv;
|
| 657 |
|
| 658 |
setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
|
| 659 |
if (err)
|
| 660 |
goto give_sigsegv;
|
| 661 |
|
| 662 |
if (TARGET_NSIG_WORDS > 1) { |
| 663 |
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
| 664 |
sizeof(frame->extramask));
|
| 665 |
} |
| 666 |
if (err)
|
| 667 |
goto give_sigsegv;
|
| 668 |
|
| 669 |
/* Set up to return from userspace. If provided, use a stub
|
| 670 |
already in userspace. */
|
| 671 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
| 672 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
| 673 |
} else {
|
| 674 |
err |= __put_user(frame->retcode, &frame->pretcode); |
| 675 |
/* This is popl %eax ; movl $,%eax ; int $0x80 */
|
| 676 |
err |= __put_user(0xb858, (short *)(frame->retcode+0)); |
| 677 |
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); |
| 678 |
err |= __put_user(0x80cd, (short *)(frame->retcode+6)); |
| 679 |
} |
| 680 |
|
| 681 |
if (err)
|
| 682 |
goto give_sigsegv;
|
| 683 |
|
| 684 |
/* Set up registers for signal handler */
|
| 685 |
env->regs[R_ESP] = (unsigned long) frame; |
| 686 |
env->eip = (unsigned long) ka->sa._sa_handler; |
| 687 |
|
| 688 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
| 689 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
| 690 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
| 691 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
| 692 |
env->eflags &= ~TF_MASK; |
| 693 |
|
| 694 |
return;
|
| 695 |
|
| 696 |
give_sigsegv:
|
| 697 |
if (sig == TARGET_SIGSEGV)
|
| 698 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
| 699 |
force_sig(TARGET_SIGSEGV /* , current */);
|
| 700 |
} |
| 701 |
|
| 702 |
static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
| 703 |
target_siginfo_t *info, |
| 704 |
target_sigset_t *set, CPUX86State *env) |
| 705 |
{
|
| 706 |
struct rt_sigframe *frame;
|
| 707 |
int err = 0; |
| 708 |
|
| 709 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
| 710 |
|
| 711 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 712 |
goto give_sigsegv;
|
| 713 |
|
| 714 |
err |= __put_user((/*current->exec_domain
|
| 715 |
&& current->exec_domain->signal_invmap
|
| 716 |
&& sig < 32
|
| 717 |
? current->exec_domain->signal_invmap[sig]
|
| 718 |
: */sig),
|
| 719 |
&frame->sig); |
| 720 |
err |= __put_user((target_ulong)&frame->info, &frame->pinfo); |
| 721 |
err |= __put_user((target_ulong)&frame->uc, &frame->puc); |
| 722 |
err |= copy_siginfo_to_user(&frame->info, info); |
| 723 |
if (err)
|
| 724 |
goto give_sigsegv;
|
| 725 |
|
| 726 |
/* Create the ucontext. */
|
| 727 |
err |= __put_user(0, &frame->uc.uc_flags);
|
| 728 |
err |= __put_user(0, &frame->uc.uc_link);
|
| 729 |
err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp); |
| 730 |
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, |
| 731 |
&frame->uc.uc_stack.ss_flags); |
| 732 |
err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size); |
| 733 |
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, |
| 734 |
env, set->sig[0]);
|
| 735 |
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
| 736 |
if (err)
|
| 737 |
goto give_sigsegv;
|
| 738 |
|
| 739 |
/* Set up to return from userspace. If provided, use a stub
|
| 740 |
already in userspace. */
|
| 741 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
| 742 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
| 743 |
} else {
|
| 744 |
err |= __put_user(frame->retcode, &frame->pretcode); |
| 745 |
/* This is movl $,%eax ; int $0x80 */
|
| 746 |
err |= __put_user(0xb8, (char *)(frame->retcode+0)); |
| 747 |
err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); |
| 748 |
err |= __put_user(0x80cd, (short *)(frame->retcode+5)); |
| 749 |
} |
| 750 |
|
| 751 |
if (err)
|
| 752 |
goto give_sigsegv;
|
| 753 |
|
| 754 |
/* Set up registers for signal handler */
|
| 755 |
env->regs[R_ESP] = (unsigned long) frame; |
| 756 |
env->eip = (unsigned long) ka->sa._sa_handler; |
| 757 |
|
| 758 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
| 759 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
| 760 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
| 761 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
| 762 |
env->eflags &= ~TF_MASK; |
| 763 |
|
| 764 |
return;
|
| 765 |
|
| 766 |
give_sigsegv:
|
| 767 |
if (sig == TARGET_SIGSEGV)
|
| 768 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
| 769 |
force_sig(TARGET_SIGSEGV /* , current */);
|
| 770 |
} |
| 771 |
|
| 772 |
static int |
| 773 |
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) |
| 774 |
{
|
| 775 |
unsigned int err = 0; |
| 776 |
|
| 777 |
cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); |
| 778 |
cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); |
| 779 |
cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); |
| 780 |
cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); |
| 781 |
|
| 782 |
env->regs[R_EDI] = ldl(&sc->edi); |
| 783 |
env->regs[R_ESI] = ldl(&sc->esi); |
| 784 |
env->regs[R_EBP] = ldl(&sc->ebp); |
| 785 |
env->regs[R_ESP] = ldl(&sc->esp); |
| 786 |
env->regs[R_EBX] = ldl(&sc->ebx); |
| 787 |
env->regs[R_EDX] = ldl(&sc->edx); |
| 788 |
env->regs[R_ECX] = ldl(&sc->ecx); |
| 789 |
env->eip = ldl(&sc->eip); |
| 790 |
|
| 791 |
cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
|
| 792 |
cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
|
| 793 |
|
| 794 |
{
|
| 795 |
unsigned int tmpflags; |
| 796 |
tmpflags = ldl(&sc->eflags); |
| 797 |
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); |
| 798 |
// regs->orig_eax = -1; /* disable syscall checks */
|
| 799 |
} |
| 800 |
|
| 801 |
{
|
| 802 |
struct _fpstate * buf;
|
| 803 |
buf = (void *)ldl(&sc->fpstate);
|
| 804 |
if (buf) {
|
| 805 |
#if 0
|
| 806 |
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
|
| 807 |
goto badframe;
|
| 808 |
#endif
|
| 809 |
cpu_x86_frstor(env, (void *)buf, 1); |
| 810 |
} |
| 811 |
} |
| 812 |
|
| 813 |
*peax = ldl(&sc->eax); |
| 814 |
return err;
|
| 815 |
#if 0
|
| 816 |
badframe:
|
| 817 |
return 1;
|
| 818 |
#endif
|
| 819 |
} |
| 820 |
|
| 821 |
long do_sigreturn(CPUX86State *env)
|
| 822 |
{
|
| 823 |
struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8); |
| 824 |
target_sigset_t target_set; |
| 825 |
sigset_t set; |
| 826 |
int eax, i;
|
| 827 |
|
| 828 |
#if defined(DEBUG_SIGNAL)
|
| 829 |
fprintf(stderr, "do_sigreturn\n");
|
| 830 |
#endif
|
| 831 |
/* set blocked signals */
|
| 832 |
target_set.sig[0] = frame->sc.oldmask;
|
| 833 |
for(i = 1; i < TARGET_NSIG_WORDS; i++) |
| 834 |
target_set.sig[i] = frame->extramask[i - 1];
|
| 835 |
|
| 836 |
target_to_host_sigset(&set, &target_set); |
| 837 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
| 838 |
|
| 839 |
/* restore registers */
|
| 840 |
if (restore_sigcontext(env, &frame->sc, &eax))
|
| 841 |
goto badframe;
|
| 842 |
return eax;
|
| 843 |
|
| 844 |
badframe:
|
| 845 |
force_sig(TARGET_SIGSEGV); |
| 846 |
return 0; |
| 847 |
} |
| 848 |
|
| 849 |
long do_rt_sigreturn(CPUX86State *env)
|
| 850 |
{
|
| 851 |
struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4); |
| 852 |
target_sigset_t target_set; |
| 853 |
sigset_t set; |
| 854 |
// stack_t st;
|
| 855 |
int eax;
|
| 856 |
|
| 857 |
#if 0
|
| 858 |
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
|
| 859 |
goto badframe;
|
| 860 |
#endif
|
| 861 |
memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
|
| 862 |
|
| 863 |
target_to_host_sigset(&set, &target_set); |
| 864 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
| 865 |
|
| 866 |
if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
|
| 867 |
goto badframe;
|
| 868 |
|
| 869 |
#if 0
|
| 870 |
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
|
| 871 |
goto badframe;
|
| 872 |
/* It is more difficult to avoid calling this function than to
|
| 873 |
call it and ignore errors. */
|
| 874 |
do_sigaltstack(&st, NULL, regs->esp);
|
| 875 |
#endif
|
| 876 |
return eax;
|
| 877 |
|
| 878 |
badframe:
|
| 879 |
force_sig(TARGET_SIGSEGV); |
| 880 |
return 0; |
| 881 |
} |
| 882 |
|
| 883 |
#elif defined(TARGET_ARM)
|
| 884 |
|
| 885 |
struct target_sigcontext {
|
| 886 |
target_ulong trap_no; |
| 887 |
target_ulong error_code; |
| 888 |
target_ulong oldmask; |
| 889 |
target_ulong arm_r0; |
| 890 |
target_ulong arm_r1; |
| 891 |
target_ulong arm_r2; |
| 892 |
target_ulong arm_r3; |
| 893 |
target_ulong arm_r4; |
| 894 |
target_ulong arm_r5; |
| 895 |
target_ulong arm_r6; |
| 896 |
target_ulong arm_r7; |
| 897 |
target_ulong arm_r8; |
| 898 |
target_ulong arm_r9; |
| 899 |
target_ulong arm_r10; |
| 900 |
target_ulong arm_fp; |
| 901 |
target_ulong arm_ip; |
| 902 |
target_ulong arm_sp; |
| 903 |
target_ulong arm_lr; |
| 904 |
target_ulong arm_pc; |
| 905 |
target_ulong arm_cpsr; |
| 906 |
target_ulong fault_address; |
| 907 |
}; |
| 908 |
|
| 909 |
typedef struct target_sigaltstack { |
| 910 |
target_ulong ss_sp; |
| 911 |
int ss_flags;
|
| 912 |
target_ulong ss_size; |
| 913 |
} target_stack_t; |
| 914 |
|
| 915 |
struct target_ucontext {
|
| 916 |
target_ulong uc_flags; |
| 917 |
target_ulong uc_link; |
| 918 |
target_stack_t uc_stack; |
| 919 |
struct target_sigcontext uc_mcontext;
|
| 920 |
target_sigset_t uc_sigmask; /* mask last for extensibility */
|
| 921 |
}; |
| 922 |
|
| 923 |
struct sigframe
|
| 924 |
{
|
| 925 |
struct target_sigcontext sc;
|
| 926 |
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
| 927 |
target_ulong retcode; |
| 928 |
}; |
| 929 |
|
| 930 |
struct rt_sigframe
|
| 931 |
{
|
| 932 |
struct target_siginfo *pinfo;
|
| 933 |
void *puc;
|
| 934 |
struct target_siginfo info;
|
| 935 |
struct target_ucontext uc;
|
| 936 |
target_ulong retcode; |
| 937 |
}; |
| 938 |
|
| 939 |
#define TARGET_CONFIG_CPU_32 1 |
| 940 |
|
| 941 |
/*
|
| 942 |
* For ARM syscalls, we encode the syscall number into the instruction.
|
| 943 |
*/
|
| 944 |
#define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE)) |
| 945 |
#define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE)) |
| 946 |
|
| 947 |
/*
|
| 948 |
* For Thumb syscalls, we pass the syscall number via r7. We therefore
|
| 949 |
* need two 16-bit instructions.
|
| 950 |
*/
|
| 951 |
#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn)) |
| 952 |
#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn)) |
| 953 |
|
| 954 |
static const target_ulong retcodes[4] = { |
| 955 |
SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, |
| 956 |
SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN |
| 957 |
}; |
| 958 |
|
| 959 |
|
| 960 |
#define __put_user_error(x,p,e) __put_user(x, p)
|
| 961 |
#define __get_user_error(x,p,e) __get_user(x, p)
|
| 962 |
|
| 963 |
static inline int valid_user_regs(CPUState *regs) |
| 964 |
{
|
| 965 |
return 1; |
| 966 |
} |
| 967 |
|
| 968 |
static int |
| 969 |
setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/ |
| 970 |
CPUState *env, unsigned long mask) |
| 971 |
{
|
| 972 |
int err = 0; |
| 973 |
|
| 974 |
__put_user_error(env->regs[0], &sc->arm_r0, err);
|
| 975 |
__put_user_error(env->regs[1], &sc->arm_r1, err);
|
| 976 |
__put_user_error(env->regs[2], &sc->arm_r2, err);
|
| 977 |
__put_user_error(env->regs[3], &sc->arm_r3, err);
|
| 978 |
__put_user_error(env->regs[4], &sc->arm_r4, err);
|
| 979 |
__put_user_error(env->regs[5], &sc->arm_r5, err);
|
| 980 |
__put_user_error(env->regs[6], &sc->arm_r6, err);
|
| 981 |
__put_user_error(env->regs[7], &sc->arm_r7, err);
|
| 982 |
__put_user_error(env->regs[8], &sc->arm_r8, err);
|
| 983 |
__put_user_error(env->regs[9], &sc->arm_r9, err);
|
| 984 |
__put_user_error(env->regs[10], &sc->arm_r10, err);
|
| 985 |
__put_user_error(env->regs[11], &sc->arm_fp, err);
|
| 986 |
__put_user_error(env->regs[12], &sc->arm_ip, err);
|
| 987 |
__put_user_error(env->regs[13], &sc->arm_sp, err);
|
| 988 |
__put_user_error(env->regs[14], &sc->arm_lr, err);
|
| 989 |
__put_user_error(env->regs[15], &sc->arm_pc, err);
|
| 990 |
#ifdef TARGET_CONFIG_CPU_32
|
| 991 |
__put_user_error(env->cpsr, &sc->arm_cpsr, err); |
| 992 |
#endif
|
| 993 |
|
| 994 |
__put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err); |
| 995 |
__put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err); |
| 996 |
__put_user_error(/* current->thread.address */ 0, &sc->fault_address, err); |
| 997 |
__put_user_error(mask, &sc->oldmask, err); |
| 998 |
|
| 999 |
return err;
|
| 1000 |
} |
| 1001 |
|
| 1002 |
static inline void * |
| 1003 |
get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize) |
| 1004 |
{
|
| 1005 |
unsigned long sp = regs->regs[13]; |
| 1006 |
|
| 1007 |
#if 0
|
| 1008 |
/*
|
| 1009 |
* This is the X/Open sanctioned signal stack switching.
|
| 1010 |
*/
|
| 1011 |
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
|
| 1012 |
sp = current->sas_ss_sp + current->sas_ss_size;
|
| 1013 |
#endif
|
| 1014 |
/*
|
| 1015 |
* ATPCS B01 mandates 8-byte alignment
|
| 1016 |
*/
|
| 1017 |
return (void *)((sp - framesize) & ~7); |
| 1018 |
} |
| 1019 |
|
| 1020 |
static int |
| 1021 |
setup_return(CPUState *env, struct emulated_sigaction *ka,
|
| 1022 |
target_ulong *rc, void *frame, int usig) |
| 1023 |
{
|
| 1024 |
target_ulong handler = (target_ulong)ka->sa._sa_handler; |
| 1025 |
target_ulong retcode; |
| 1026 |
int thumb = 0; |
| 1027 |
#if defined(TARGET_CONFIG_CPU_32)
|
| 1028 |
target_ulong cpsr = env->cpsr; |
| 1029 |
|
| 1030 |
#if 0
|
| 1031 |
/*
|
| 1032 |
* Maybe we need to deliver a 32-bit signal to a 26-bit task.
|
| 1033 |
*/
|
| 1034 |
if (ka->sa.sa_flags & SA_THIRTYTWO)
|
| 1035 |
cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
|
| 1036 |
|
| 1037 |
#ifdef CONFIG_ARM_THUMB
|
| 1038 |
if (elf_hwcap & HWCAP_THUMB) {
|
| 1039 |
/*
|
| 1040 |
* The LSB of the handler determines if we're going to
|
| 1041 |
* be using THUMB or ARM mode for this signal handler.
|
| 1042 |
*/
|
| 1043 |
thumb = handler & 1;
|
| 1044 |
|
| 1045 |
if (thumb)
|
| 1046 |
cpsr |= T_BIT;
|
| 1047 |
else
|
| 1048 |
cpsr &= ~T_BIT;
|
| 1049 |
}
|
| 1050 |
#endif
|
| 1051 |
#endif
|
| 1052 |
#endif /* TARGET_CONFIG_CPU_32 */ |
| 1053 |
|
| 1054 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
| 1055 |
retcode = (target_ulong)ka->sa.sa_restorer; |
| 1056 |
} else {
|
| 1057 |
unsigned int idx = thumb; |
| 1058 |
|
| 1059 |
if (ka->sa.sa_flags & TARGET_SA_SIGINFO)
|
| 1060 |
idx += 2;
|
| 1061 |
|
| 1062 |
if (__put_user(retcodes[idx], rc))
|
| 1063 |
return 1; |
| 1064 |
#if 0
|
| 1065 |
flush_icache_range((target_ulong)rc,
|
| 1066 |
(target_ulong)(rc + 1));
|
| 1067 |
#endif
|
| 1068 |
retcode = ((target_ulong)rc) + thumb; |
| 1069 |
} |
| 1070 |
|
| 1071 |
env->regs[0] = usig;
|
| 1072 |
env->regs[13] = (target_ulong)frame;
|
| 1073 |
env->regs[14] = retcode;
|
| 1074 |
env->regs[15] = handler & (thumb ? ~1 : ~3); |
| 1075 |
|
| 1076 |
#ifdef TARGET_CONFIG_CPU_32
|
| 1077 |
env->cpsr = cpsr; |
| 1078 |
#endif
|
| 1079 |
|
| 1080 |
return 0; |
| 1081 |
} |
| 1082 |
|
| 1083 |
static void setup_frame(int usig, struct emulated_sigaction *ka, |
| 1084 |
target_sigset_t *set, CPUState *regs) |
| 1085 |
{
|
| 1086 |
struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 1087 |
int err = 0; |
| 1088 |
|
| 1089 |
err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]); |
| 1090 |
|
| 1091 |
if (TARGET_NSIG_WORDS > 1) { |
| 1092 |
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
| 1093 |
sizeof(frame->extramask));
|
| 1094 |
} |
| 1095 |
|
| 1096 |
if (err == 0) |
| 1097 |
err = setup_return(regs, ka, &frame->retcode, frame, usig); |
| 1098 |
// return err;
|
| 1099 |
} |
| 1100 |
|
| 1101 |
static void setup_rt_frame(int usig, struct emulated_sigaction *ka, |
| 1102 |
target_siginfo_t *info, |
| 1103 |
target_sigset_t *set, CPUState *env) |
| 1104 |
{
|
| 1105 |
struct rt_sigframe *frame = get_sigframe(ka, env, sizeof(*frame)); |
| 1106 |
int err = 0; |
| 1107 |
|
| 1108 |
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
| 1109 |
return /* 1 */; |
| 1110 |
|
| 1111 |
__put_user_error(&frame->info, (target_ulong *)&frame->pinfo, err); |
| 1112 |
__put_user_error(&frame->uc, (target_ulong *)&frame->puc, err); |
| 1113 |
err |= copy_siginfo_to_user(&frame->info, info); |
| 1114 |
|
| 1115 |
/* Clear all the bits of the ucontext we don't use. */
|
| 1116 |
err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
|
| 1117 |
|
| 1118 |
err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
|
| 1119 |
env, set->sig[0]);
|
| 1120 |
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
| 1121 |
|
| 1122 |
if (err == 0) |
| 1123 |
err = setup_return(env, ka, &frame->retcode, frame, usig); |
| 1124 |
|
| 1125 |
if (err == 0) { |
| 1126 |
/*
|
| 1127 |
* For realtime signals we must also set the second and third
|
| 1128 |
* arguments for the signal handler.
|
| 1129 |
* -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
|
| 1130 |
*/
|
| 1131 |
env->regs[1] = (target_ulong)frame->pinfo;
|
| 1132 |
env->regs[2] = (target_ulong)frame->puc;
|
| 1133 |
} |
| 1134 |
|
| 1135 |
// return err;
|
| 1136 |
} |
| 1137 |
|
| 1138 |
static int |
| 1139 |
restore_sigcontext(CPUState *env, struct target_sigcontext *sc)
|
| 1140 |
{
|
| 1141 |
int err = 0; |
| 1142 |
|
| 1143 |
__get_user_error(env->regs[0], &sc->arm_r0, err);
|
| 1144 |
__get_user_error(env->regs[1], &sc->arm_r1, err);
|
| 1145 |
__get_user_error(env->regs[2], &sc->arm_r2, err);
|
| 1146 |
__get_user_error(env->regs[3], &sc->arm_r3, err);
|
| 1147 |
__get_user_error(env->regs[4], &sc->arm_r4, err);
|
| 1148 |
__get_user_error(env->regs[5], &sc->arm_r5, err);
|
| 1149 |
__get_user_error(env->regs[6], &sc->arm_r6, err);
|
| 1150 |
__get_user_error(env->regs[7], &sc->arm_r7, err);
|
| 1151 |
__get_user_error(env->regs[8], &sc->arm_r8, err);
|
| 1152 |
__get_user_error(env->regs[9], &sc->arm_r9, err);
|
| 1153 |
__get_user_error(env->regs[10], &sc->arm_r10, err);
|
| 1154 |
__get_user_error(env->regs[11], &sc->arm_fp, err);
|
| 1155 |
__get_user_error(env->regs[12], &sc->arm_ip, err);
|
| 1156 |
__get_user_error(env->regs[13], &sc->arm_sp, err);
|
| 1157 |
__get_user_error(env->regs[14], &sc->arm_lr, err);
|
| 1158 |
__get_user_error(env->regs[15], &sc->arm_pc, err);
|
| 1159 |
#ifdef TARGET_CONFIG_CPU_32
|
| 1160 |
__get_user_error(env->cpsr, &sc->arm_cpsr, err); |
| 1161 |
#endif
|
| 1162 |
|
| 1163 |
err |= !valid_user_regs(env); |
| 1164 |
|
| 1165 |
return err;
|
| 1166 |
} |
| 1167 |
|
| 1168 |
long do_sigreturn(CPUState *env)
|
| 1169 |
{
|
| 1170 |
struct sigframe *frame;
|
| 1171 |
target_sigset_t set; |
| 1172 |
sigset_t host_set; |
| 1173 |
|
| 1174 |
/*
|
| 1175 |
* Since we stacked the signal on a 64-bit boundary,
|
| 1176 |
* then 'sp' should be word aligned here. If it's
|
| 1177 |
* not, then the user is trying to mess with us.
|
| 1178 |
*/
|
| 1179 |
if (env->regs[13] & 7) |
| 1180 |
goto badframe;
|
| 1181 |
|
| 1182 |
frame = (struct sigframe *)env->regs[13]; |
| 1183 |
|
| 1184 |
#if 0
|
| 1185 |
if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
|
| 1186 |
goto badframe;
|
| 1187 |
#endif
|
| 1188 |
if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 1189 |
|| (TARGET_NSIG_WORDS > 1
|
| 1190 |
&& __copy_from_user(&set.sig[1], &frame->extramask,
|
| 1191 |
sizeof(frame->extramask))))
|
| 1192 |
goto badframe;
|
| 1193 |
|
| 1194 |
target_to_host_sigset(&host_set, &set); |
| 1195 |
sigprocmask(SIG_SETMASK, &host_set, NULL);
|
| 1196 |
|
| 1197 |
if (restore_sigcontext(env, &frame->sc))
|
| 1198 |
goto badframe;
|
| 1199 |
|
| 1200 |
#if 0
|
| 1201 |
/* Send SIGTRAP if we're single-stepping */
|
| 1202 |
if (ptrace_cancel_bpt(current))
|
| 1203 |
send_sig(SIGTRAP, current, 1);
|
| 1204 |
#endif
|
| 1205 |
return env->regs[0]; |
| 1206 |
|
| 1207 |
badframe:
|
| 1208 |
force_sig(SIGSEGV /* , current */);
|
| 1209 |
return 0; |
| 1210 |
} |
| 1211 |
|
| 1212 |
long do_rt_sigreturn(CPUState *env)
|
| 1213 |
{
|
| 1214 |
struct rt_sigframe *frame;
|
| 1215 |
target_sigset_t set; |
| 1216 |
sigset_t host_set; |
| 1217 |
|
| 1218 |
/*
|
| 1219 |
* Since we stacked the signal on a 64-bit boundary,
|
| 1220 |
* then 'sp' should be word aligned here. If it's
|
| 1221 |
* not, then the user is trying to mess with us.
|
| 1222 |
*/
|
| 1223 |
if (env->regs[13] & 7) |
| 1224 |
goto badframe;
|
| 1225 |
|
| 1226 |
frame = (struct rt_sigframe *)env->regs[13]; |
| 1227 |
|
| 1228 |
#if 0
|
| 1229 |
if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
|
| 1230 |
goto badframe;
|
| 1231 |
#endif
|
| 1232 |
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 1233 |
goto badframe;
|
| 1234 |
|
| 1235 |
target_to_host_sigset(&host_set, &set); |
| 1236 |
sigprocmask(SIG_SETMASK, &host_set, NULL);
|
| 1237 |
|
| 1238 |
if (restore_sigcontext(env, &frame->uc.uc_mcontext))
|
| 1239 |
goto badframe;
|
| 1240 |
|
| 1241 |
#if 0
|
| 1242 |
/* Send SIGTRAP if we're single-stepping */
|
| 1243 |
if (ptrace_cancel_bpt(current))
|
| 1244 |
send_sig(SIGTRAP, current, 1);
|
| 1245 |
#endif
|
| 1246 |
return env->regs[0]; |
| 1247 |
|
| 1248 |
badframe:
|
| 1249 |
force_sig(SIGSEGV /* , current */);
|
| 1250 |
return 0; |
| 1251 |
} |
| 1252 |
|
| 1253 |
#else
|
| 1254 |
|
| 1255 |
static void setup_frame(int sig, struct emulated_sigaction *ka, |
| 1256 |
target_sigset_t *set, CPUState *env) |
| 1257 |
{
|
| 1258 |
fprintf(stderr, "setup_frame: not implemented\n");
|
| 1259 |
} |
| 1260 |
|
| 1261 |
static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
| 1262 |
target_siginfo_t *info, |
| 1263 |
target_sigset_t *set, CPUState *env) |
| 1264 |
{
|
| 1265 |
fprintf(stderr, "setup_rt_frame: not implemented\n");
|
| 1266 |
} |
| 1267 |
|
| 1268 |
long do_sigreturn(CPUState *env)
|
| 1269 |
{
|
| 1270 |
fprintf(stderr, "do_sigreturn: not implemented\n");
|
| 1271 |
return -ENOSYS;
|
| 1272 |
} |
| 1273 |
|
| 1274 |
long do_rt_sigreturn(CPUState *env)
|
| 1275 |
{
|
| 1276 |
fprintf(stderr, "do_rt_sigreturn: not implemented\n");
|
| 1277 |
return -ENOSYS;
|
| 1278 |
} |
| 1279 |
|
| 1280 |
#endif
|
| 1281 |
|
| 1282 |
void process_pending_signals(void *cpu_env) |
| 1283 |
{
|
| 1284 |
int sig;
|
| 1285 |
target_ulong handler; |
| 1286 |
sigset_t set, old_set; |
| 1287 |
target_sigset_t target_old_set; |
| 1288 |
struct emulated_sigaction *k;
|
| 1289 |
struct sigqueue *q;
|
| 1290 |
|
| 1291 |
if (!signal_pending)
|
| 1292 |
return;
|
| 1293 |
|
| 1294 |
k = sigact_table; |
| 1295 |
for(sig = 1; sig <= TARGET_NSIG; sig++) { |
| 1296 |
if (k->pending)
|
| 1297 |
goto handle_signal;
|
| 1298 |
k++; |
| 1299 |
} |
| 1300 |
/* if no signal is pending, just return */
|
| 1301 |
signal_pending = 0;
|
| 1302 |
return;
|
| 1303 |
|
| 1304 |
handle_signal:
|
| 1305 |
#ifdef DEBUG_SIGNAL
|
| 1306 |
fprintf(stderr, "qemu: process signal %d\n", sig);
|
| 1307 |
#endif
|
| 1308 |
/* dequeue signal */
|
| 1309 |
q = k->first; |
| 1310 |
k->first = q->next; |
| 1311 |
if (!k->first)
|
| 1312 |
k->pending = 0;
|
| 1313 |
|
| 1314 |
handler = k->sa._sa_handler; |
| 1315 |
if (handler == TARGET_SIG_DFL) {
|
| 1316 |
/* default handler : ignore some signal. The other are fatal */
|
| 1317 |
if (sig != TARGET_SIGCHLD &&
|
| 1318 |
sig != TARGET_SIGURG && |
| 1319 |
sig != TARGET_SIGWINCH) {
|
| 1320 |
force_sig(sig); |
| 1321 |
} |
| 1322 |
} else if (handler == TARGET_SIG_IGN) { |
| 1323 |
/* ignore sig */
|
| 1324 |
} else if (handler == TARGET_SIG_ERR) { |
| 1325 |
force_sig(sig); |
| 1326 |
} else {
|
| 1327 |
/* compute the blocked signals during the handler execution */
|
| 1328 |
target_to_host_sigset(&set, &k->sa.sa_mask); |
| 1329 |
/* SA_NODEFER indicates that the current signal should not be
|
| 1330 |
blocked during the handler */
|
| 1331 |
if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
|
| 1332 |
sigaddset(&set, target_to_host_signal(sig)); |
| 1333 |
|
| 1334 |
/* block signals in the handler using Linux */
|
| 1335 |
sigprocmask(SIG_BLOCK, &set, &old_set); |
| 1336 |
/* save the previous blocked signal state to restore it at the
|
| 1337 |
end of the signal execution (see do_sigreturn) */
|
| 1338 |
host_to_target_sigset(&target_old_set, &old_set); |
| 1339 |
|
| 1340 |
/* if the CPU is in VM86 mode, we restore the 32 bit values */
|
| 1341 |
#ifdef TARGET_I386
|
| 1342 |
{
|
| 1343 |
CPUX86State *env = cpu_env; |
| 1344 |
if (env->eflags & VM_MASK)
|
| 1345 |
save_v86_state(env); |
| 1346 |
} |
| 1347 |
#endif
|
| 1348 |
/* prepare the stack frame of the virtual CPU */
|
| 1349 |
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
|
| 1350 |
setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env); |
| 1351 |
else
|
| 1352 |
setup_frame(sig, k, &target_old_set, cpu_env); |
| 1353 |
if (k->sa.sa_flags & TARGET_SA_RESETHAND)
|
| 1354 |
k->sa._sa_handler = TARGET_SIG_DFL; |
| 1355 |
} |
| 1356 |
if (q != &k->info)
|
| 1357 |
free_sigqueue(q); |
| 1358 |
} |
| 1359 |
|
| 1360 |
|