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80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/* POSIX.1 `sigaction' call for Linux/i386.
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Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <ldsodefs.h>
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#define SA_RESTORER 0x04000000
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extern void restore_rt (void) asm ("__restore_rt") attribute_hidden;
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extern void restore (void) asm ("__restore") attribute_hidden;
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#define SET_SA_RESTORER(kact, act) \
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({ \
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if (GLRO(dl_sysinfo_dso) == NULL) \
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{ \
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(kact)->sa_flags |= SA_RESTORER; \
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(kact)->sa_restorer = (((act)->sa_flags & SA_SIGINFO) \
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? &restore_rt : &restore); \
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} \
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else \
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(kact)->sa_restorer = NULL; \
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})
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#define RESET_SA_RESTORER(act, kact) \
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(act)->sa_restorer = (kact)->sa_restorer
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#include <sysdeps/unix/sysv/linux/sigaction.c>
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/* NOTE: Please think twice before making any changes to the bits of
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code below. GDB needs some intimate knowledge about it to
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recognize them as signal trampolines, and make backtraces through
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signal handlers work right. Important are both the names
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(__restore and __restore_rt) and the exact instruction sequence.
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If you ever feel the need to make any changes, please notify the
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appropriate GDB maintainer. */
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#define RESTORE(name, syscall) RESTORE2 (name, syscall)
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#define RESTORE2(name, syscall) \
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asm \
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( \
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".text\n" \
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" .align 16\n" \
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"__" #name ":\n" \
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" movl $" #syscall ", %eax\n" \
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" int $0x80" \
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);
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/* The return code for realtime-signals. */
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RESTORE (restore_rt, __NR_rt_sigreturn)
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/* For the boring old signals. */
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#undef RESTORE2
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#define RESTORE2(name, syscall) \
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asm \
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( \
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".text\n" \
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" .align 8\n" \
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"__" #name ":\n" \
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" popl %eax\n" \
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" movl $" #syscall ", %eax\n" \
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" int $0x80" \
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);
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RESTORE (restore, __NR_sigreturn)
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