mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
a894053318
The generic implementation basically handle the system agnostic logic (filtering out the invalid signals) while the __libc_sigaction is the function with implements the system and architecture bits. Checked on x86_64-linux-gnu and i686-linux-gnu.
80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/* POSIX.1 `sigaction' call for Linux/i386.
|
|
Copyright (C) 1991-2021 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <signal.h>
|
|
#include <ldsodefs.h>
|
|
|
|
#define SA_RESTORER 0x04000000
|
|
|
|
extern void restore_rt (void) asm ("__restore_rt") attribute_hidden;
|
|
extern void restore (void) asm ("__restore") attribute_hidden;
|
|
|
|
#define SET_SA_RESTORER(kact, act) \
|
|
({ \
|
|
if (GLRO(dl_sysinfo_dso) == NULL) \
|
|
{ \
|
|
(kact)->sa_flags |= SA_RESTORER; \
|
|
(kact)->sa_restorer = (((act)->sa_flags & SA_SIGINFO) \
|
|
? &restore_rt : &restore); \
|
|
} \
|
|
else \
|
|
(kact)->sa_restorer = NULL; \
|
|
})
|
|
|
|
#define RESET_SA_RESTORER(act, kact) \
|
|
(act)->sa_restorer = (kact)->sa_restorer
|
|
|
|
#include <sysdeps/unix/sysv/linux/libc_sigaction.c>
|
|
|
|
/* 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)
|
|
#define RESTORE2(name, syscall) \
|
|
asm \
|
|
( \
|
|
".text\n" \
|
|
" .align 16\n" \
|
|
"__" #name ":\n" \
|
|
" movl $" #syscall ", %eax\n" \
|
|
" int $0x80" \
|
|
);
|
|
|
|
/* The return code for realtime-signals. */
|
|
RESTORE (restore_rt, __NR_rt_sigreturn)
|
|
|
|
/* For the boring old signals. */
|
|
#undef RESTORE2
|
|
#define RESTORE2(name, syscall) \
|
|
asm \
|
|
( \
|
|
".text\n" \
|
|
" .align 8\n" \
|
|
"__" #name ":\n" \
|
|
" popl %eax\n" \
|
|
" movl $" #syscall ", %eax\n" \
|
|
" int $0x80" \
|
|
);
|
|
|
|
RESTORE (restore, __NR_sigreturn)
|