mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 08:40:07 +00:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
80 lines
2.4 KiB
ArmAsm
80 lines
2.4 KiB
ArmAsm
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Andreas Schwab <schwab@gnu.org>.
|
|
|
|
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 <sysdep.h>
|
|
#define _ERRNO_H 1
|
|
#include <bits/errno.h>
|
|
#include <tcb-offsets.h>
|
|
|
|
/* Clone the calling process, but without copying the whole address space.
|
|
The calling process is suspended until the new process exits or is
|
|
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
|
|
and the process ID of the new process to the old process. */
|
|
|
|
ENTRY (__vfork)
|
|
|
|
/* Pop the return PC value into ECX. */
|
|
popl %ecx
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_register (%eip, %ecx)
|
|
|
|
/* Stuff the syscall number in EAX and enter into the kernel. */
|
|
movl $SYS_ify (vfork), %eax
|
|
int $0x80
|
|
|
|
/* Jump to the return PC. Don't jump directly since this
|
|
disturbs the branch target cache. Instead push the return
|
|
address back on the stack. */
|
|
pushl %ecx
|
|
cfi_adjust_cfa_offset (4)
|
|
|
|
cmpl $-4095, %eax
|
|
/* Branch forward if it failed. */
|
|
jae SYSCALL_ERROR_LABEL
|
|
|
|
#if SHSTK_ENABLED
|
|
/* Check if shadow stack is in use. */
|
|
xorl %edx, %edx
|
|
rdsspd %edx
|
|
testl %edx, %edx
|
|
/* Normal return if shadow stack isn't in use. */
|
|
je L(no_shstk)
|
|
|
|
testl %eax, %eax
|
|
/* In parent, normal return. */
|
|
jnz L(no_shstk)
|
|
|
|
/* NB: In child, jump back to caller via indirect branch without
|
|
popping shadow stack which is shared with parent. Keep shadow
|
|
stack mismatched so that child returns in the vfork-calling
|
|
function will trigger SIGSEGV. */
|
|
popl %ecx
|
|
cfi_adjust_cfa_offset (-4)
|
|
jmp *%ecx
|
|
|
|
L(no_shstk):
|
|
#endif
|
|
|
|
ret
|
|
|
|
PSEUDO_END (__vfork)
|
|
libc_hidden_def (__vfork)
|
|
|
|
weak_alias (__vfork, vfork)
|
|
strong_alias (__vfork, __libc_vfork)
|