2022-01-01 18:54:23 +00:00
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/* Copyright (C) 1999-2022 Free Software Foundation, Inc.
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1999-01-21 09:26:20 +00:00
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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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2001-07-06 04:58:11 +00:00
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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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1999-01-21 09:26:20 +00:00
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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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2001-07-06 04:58:11 +00:00
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Lesser General Public License for more details.
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1999-01-21 09:26:20 +00:00
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2001-07-06 04:58:11 +00:00
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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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1999-01-21 09:26:20 +00:00
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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2014-05-14 16:44:39 +00:00
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#include <tcb-offsets.h>
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1999-01-21 09:26:20 +00:00
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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ENTRY (__vfork)
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/* Pop the return PC value into ECX. */
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popl %ecx
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2005-05-04 17:58:13 +00:00
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cfi_adjust_cfa_offset (-4)
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2008-04-09 18:30:12 +00:00
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cfi_register (%eip, %ecx)
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1999-01-21 09:26:20 +00:00
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/* Stuff the syscall number in EAX and enter into the kernel. */
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movl $SYS_ify (vfork), %eax
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int $0x80
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2002-10-16 04:39:59 +00:00
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/* Jump to the return PC. Don't jump directly since this
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disturbs the branch target cache. Instead push the return
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address back on the stack. */
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pushl %ecx
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2005-05-04 17:58:13 +00:00
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cfi_adjust_cfa_offset (4)
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2002-10-16 04:39:59 +00:00
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1999-01-21 09:26:20 +00:00
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cmpl $-4095, %eax
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2002-10-16 04:39:59 +00:00
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/* Branch forward if it failed. */
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jae SYSCALL_ERROR_LABEL
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1999-01-21 09:26:20 +00:00
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2018-07-24 12:20:48 +00:00
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#if SHSTK_ENABLED
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/* Check if shadow stack is in use. */
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xorl %edx, %edx
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rdsspd %edx
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testl %edx, %edx
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/* Normal return if shadow stack isn't in use. */
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je L(no_shstk)
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2020-09-16 23:00:14 +00:00
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testl %eax, %eax
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/* In parent, normal return. */
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jnz L(no_shstk)
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/* NB: In child, jump back to caller via indirect branch without
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popping shadow stack which is shared with parent. Keep shadow
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stack mismatched so that child returns in the vfork-calling
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function will trigger SIGSEGV. */
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popl %ecx
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cfi_adjust_cfa_offset (-4)
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2018-07-24 12:20:48 +00:00
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jmp *%ecx
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L(no_shstk):
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#endif
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2002-10-16 04:39:59 +00:00
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ret
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1999-01-21 09:26:20 +00:00
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PSEUDO_END (__vfork)
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2002-12-31 20:46:11 +00:00
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libc_hidden_def (__vfork)
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1999-01-21 09:26:20 +00:00
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weak_alias (__vfork, vfork)
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2014-05-14 16:44:39 +00:00
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strong_alias (__vfork, __libc_vfork)
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