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- /* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- see <http://www.gnu.org/licenses/>.
- Totally hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
- */
- #include <errno.h>
- #include <signal.h>
- #include <string.h>
- #include <sys/syscall.h>
- #include <bits/kernel_sigaction.h>
- #define SA_RESTORER 0x04000000
- #if defined __NR_rt_sigaction
- extern void restore_rt(void) __asm__ ("__restore_rt") attribute_hidden;
- extern void restore(void) __asm__ ("__restore") attribute_hidden;
- /* If ACT is not NULL, change mask, handler and flags for SIG to ACT's
- If OACT is not NULL, put the old action for SIG in *OACT. */
- int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
- {
- struct sigaction kact;
- if (act) {
- memcpy(&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
- kact.sa_handler = act->sa_handler;
- kact.sa_flags = act->sa_flags;
- kact.sa_restorer = (act->sa_flags & SA_SIGINFO) ? &restore_rt : &restore;
- act = &kact;
- }
- /* NB: kernel (as of 2.6.25) will return EINVAL
- * if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
- return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
- }
- #else
- extern void restore(void) __asm__ ("__restore") attribute_hidden;
- /* If ACT is not NULL, change the action for SIG to *ACT.
- If OACT is not NULL, put the old action for SIG in *OACT. */
- int __libc_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
- {
- int result;
- struct old_kernel_sigaction kact, koact;
- if (act) {
- kact.k_sa_handler = act->sa_handler;
- kact.sa_mask = act->sa_mask.__val[0];
- kact.sa_flags = act->sa_flags | SA_RESTORER;
- kact.sa_restorer = &restore;
- }
- __asm__ __volatile__ (
- " pushl %%ebx\n"
- " movl %3, %%ebx\n"
- " int $0x80\n"
- " popl %%ebx\n"
- : "=a" (result), "=m" (koact)
- : "0" (__NR_sigaction), "r" (sig), "m" (kact),
- "c" (act ? &kact : NULL),
- "d" (oact ? &koact : NULL));
- if (result < 0) {
- __set_errno(-result);
- return -1;
- }
- if (oact) {
- oact->sa_handler = koact.k_sa_handler;
- oact->sa_mask.__val[0] = koact.sa_mask;
- oact->sa_flags = koact.sa_flags;
- oact->sa_restorer = koact.sa_restorer;
- }
- return result;
- }
- #endif
- #ifndef LIBC_SIGACTION
- # ifndef __UCLIBC_HAS_THREADS__
- strong_alias(__libc_sigaction,sigaction)
- libc_hidden_def(sigaction)
- # else
- weak_alias(__libc_sigaction,sigaction)
- libc_hidden_weak(sigaction)
- # endif
- #endif
- /* NOTE: Please think twice before making any changes to the bits of
- code below. GDB needs some intimate knowledge about it to
- recognize them as signal trampolines, and make backtraces through
- signal handlers work right. Important are both the names
- (__restore and __restore_rt) and the exact instruction sequence.
- If you ever feel the need to make any changes, please notify the
- appropriate GDB maintainer. */
- #define RESTORE(name, syscall) RESTORE2(name, syscall)
- #ifdef __NR_rt_sigaction
- /* The return code for realtime-signals. */
- # define RESTORE2(name, syscall) \
- __asm__ ( \
- "nop\n" \
- ".text\n" \
- "__" #name ":\n" \
- " movl $" #syscall ", %eax\n" \
- " int $0x80\n" \
- );
- RESTORE(restore_rt, __NR_rt_sigreturn)
- #endif
- #ifdef __NR_sigreturn
- /* For the boring old signals. */
- # undef RESTORE2
- # define RESTORE2(name, syscall) \
- __asm__ ( \
- "nop\n" \
- ".text\n" \
- "__" #name ":\n" \
- " popl %eax\n" \
- " movl $" #syscall ", %eax\n" \
- " int $0x80\n" \
- );
- RESTORE(restore, __NR_sigreturn)
- #endif
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