Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
109 lines (93 sloc)
3.74 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Copyright (C) 2002-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Jakub Jelinek <jakub@redhat.com>, 2002. | |
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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <sysdep.h> | |
#include <tls.h> | |
#ifndef __ASSEMBLER__ | |
# include <nptl/pthreadP.h> | |
#endif | |
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt) | |
/* The code to disable cancellation depends on the fact that the called | |
functions are special. They don't modify registers other than %rax | |
and %r11 if they return. Therefore we don't have to preserve other | |
registers around these calls. */ | |
# undef PSEUDO | |
# define PSEUDO(name, syscall_name, args) \ | |
.text; \ | |
ENTRY (name) \ | |
SINGLE_THREAD_P; \ | |
jne L(pseudo_cancel); \ | |
.type __##syscall_name##_nocancel,@function; \ | |
.globl __##syscall_name##_nocancel; \ | |
__##syscall_name##_nocancel: \ | |
DO_CALL (syscall_name, args); \ | |
cmpq $-4095, %rax; \ | |
jae SYSCALL_ERROR_LABEL; \ | |
ret; \ | |
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \ | |
L(pseudo_cancel): \ | |
/* We always have to align the stack before calling a function. */ \ | |
subq $8, %rsp; cfi_adjust_cfa_offset (8); \ | |
CENABLE \ | |
/* The return value from CENABLE is argument for CDISABLE. */ \ | |
movq %rax, (%rsp); \ | |
DO_CALL (syscall_name, args); \ | |
movq (%rsp), %rdi; \ | |
/* Save %rax since it's the error code from the syscall. */ \ | |
movq %rax, %rdx; \ | |
CDISABLE \ | |
movq %rdx, %rax; \ | |
addq $8,%rsp; cfi_adjust_cfa_offset (-8); \ | |
cmpq $-4095, %rax; \ | |
jae SYSCALL_ERROR_LABEL | |
# if IS_IN (libpthread) | |
# define CENABLE call __pthread_enable_asynccancel; | |
# define CDISABLE call __pthread_disable_asynccancel; | |
# define __local_multiple_threads __pthread_multiple_threads | |
# elif IS_IN (libc) | |
# define CENABLE call __libc_enable_asynccancel; | |
# define CDISABLE call __libc_disable_asynccancel; | |
# define __local_multiple_threads __libc_multiple_threads | |
# elif IS_IN (librt) | |
# define CENABLE call __librt_enable_asynccancel; | |
# define CDISABLE call __librt_disable_asynccancel; | |
# else | |
# error Unsupported library | |
# endif | |
# if IS_IN (libpthread) || IS_IN (libc) | |
# ifndef __ASSEMBLER__ | |
extern int __local_multiple_threads attribute_hidden; | |
# define SINGLE_THREAD_P \ | |
__builtin_expect (__local_multiple_threads == 0, 1) | |
# else | |
# define SINGLE_THREAD_P cmpl $0, __local_multiple_threads(%rip) | |
# endif | |
# else | |
# ifndef __ASSEMBLER__ | |
# define SINGLE_THREAD_P \ | |
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \ | |
header.multiple_threads) == 0, 1) | |
# else | |
# define SINGLE_THREAD_P cmpl $0, %fs:MULTIPLE_THREADS_OFFSET | |
# endif | |
# endif | |
#elif !defined __ASSEMBLER__ | |
# define SINGLE_THREAD_P (1) | |
# define NO_CANCELLATION 1 | |
#endif | |
#ifndef __ASSEMBLER__ | |
# define RTLD_SINGLE_THREAD_P \ | |
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \ | |
header.multiple_threads) == 0, 1) | |
#endif |