2022-01-01 18:54:23 +00:00
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/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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1996-11-20 03:45:46 +00:00
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This file is part of the GNU C Library.
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1996-08-10 00:47:07 +00:00
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1996-11-20 03:45:46 +00:00
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 04:56:23 +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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1996-08-10 00:47:07 +00:00
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1996-11-20 03:45:46 +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 04:56:23 +00:00
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Lesser General Public License for more details.
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1996-08-10 00:47:07 +00:00
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2001-07-06 04:56:23 +00:00
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You should have received a copy of the GNU Lesser General Public
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2012-03-09 23:56:38 +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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1996-08-10 00:47:07 +00:00
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sysdep.h>
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1996-10-08 23:39:13 +00:00
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#define _ERRNO_H 1
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1997-06-21 01:37:20 +00:00
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#include <bits/errno.h>
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1996-08-10 00:47:07 +00:00
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2003-06-30 23:21:49 +00:00
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags,
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void *arg, pid_t *ptid, void *tls, pid_t *ctid);
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Note that everything past ARG is technically optional, based
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on FLAGS, and that CTID is arg 7, and thus is on the stack.
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However, since a load from top-of-stack better be legal always,
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we don't bother checking FLAGS. */
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1996-08-10 00:47:07 +00:00
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.text
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2012-09-28 17:51:01 +00:00
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.align 4
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.globl __clone
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.ent __clone
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.usepv __clone, USEPV_PROF
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cfi_startproc
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__clone:
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1996-11-07 01:34:35 +00:00
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#ifdef PROF
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2018-03-09 14:42:04 +00:00
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.set noat
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1998-01-26 22:04:53 +00:00
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ldgp gp,0(pv)
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1996-11-07 01:34:35 +00:00
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lda AT, _mcount
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jsr AT, (AT), _mcount
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2018-03-09 14:42:04 +00:00
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.set at
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1998-01-26 22:04:53 +00:00
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#endif
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1996-08-10 00:47:07 +00:00
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/* Sanity check arguments. */
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2012-09-28 17:51:01 +00:00
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ldiq v0, EINVAL
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beq a0, SYSCALL_ERROR_LABEL /* no NULL function pointers */
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beq a1, SYSCALL_ERROR_LABEL /* no NULL stack pointers */
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1996-08-10 00:47:07 +00:00
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1997-05-07 15:31:06 +00:00
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/* Save the fn ptr and arg on the new stack. */
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2012-09-28 17:51:01 +00:00
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subq a1, 32, a1
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stq a0, 0(a1)
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stq a3, 8(a1)
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stq a2, 16(a1)
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1997-05-07 15:31:06 +00:00
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2003-06-30 23:21:49 +00:00
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/* The syscall is of the form clone(flags, usp, ptid, ctid, tls).
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Shift the flags, ptid, ctid, tls arguments into place; the
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2002-11-08 02:18:45 +00:00
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child_stack argument is already correct. */
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2012-09-28 17:51:01 +00:00
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mov a2, a0
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mov a4, a2
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ldq a3, 0(sp)
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mov a5, a4
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2002-11-08 02:18:45 +00:00
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/* Do the system call. */
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2012-09-28 17:51:01 +00:00
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ldiq v0, __NR_clone
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1996-08-10 00:47:07 +00:00
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call_pal PAL_callsys
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2012-09-28 17:51:01 +00:00
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bne a3, SYSCALL_ERROR_LABEL
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beq v0, thread_start
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1996-08-10 00:47:07 +00:00
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2002-11-08 02:18:45 +00:00
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/* Successful return from the parent. */
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1996-08-10 00:47:07 +00:00
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ret
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2012-09-28 17:51:01 +00:00
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PSEUDO_END(__clone)
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cfi_endproc
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1996-08-10 00:47:07 +00:00
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/* Load up the arguments to the function. Put this block of code in
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its own function so that we can terminate the stack trace with our
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1997-01-20 02:49:42 +00:00
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debug info. */
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1996-08-10 00:47:07 +00:00
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2014-05-21 21:36:45 +00:00
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.align 4
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1996-08-10 00:47:07 +00:00
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.ent thread_start
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2012-09-28 17:51:01 +00:00
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cfi_startproc
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1996-08-10 00:47:07 +00:00
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thread_start:
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2004-08-25 19:59:01 +00:00
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mov 0, fp
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2012-09-28 17:51:01 +00:00
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cfi_def_cfa_register(fp)
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cfi_undefined(ra)
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1996-08-10 00:47:07 +00:00
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1997-05-07 15:31:06 +00:00
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/* Load up the arguments. */
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2012-09-28 17:51:01 +00:00
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ldq pv, 0(sp)
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ldq a0, 8(sp)
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addq sp, 32, sp
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1997-05-07 15:31:06 +00:00
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2002-11-08 02:18:45 +00:00
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/* Call the user's function. */
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2012-09-28 17:51:01 +00:00
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jsr ra, (pv)
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ldgp gp, 0(ra)
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1996-08-10 00:47:07 +00:00
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2017-07-19 14:45:37 +00:00
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mov v0, a0
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Call exit directly in clone (BZ #21512)
On aarch64, alpha, arm, hppa, mips, nios2, powerpc, sh, sparc, tile,
and x86_64 the clone syscall jumps to _exit after the child execution
and the function ends the process execution by calling exit_group.
This behavior have a small issue where threads created with
CLONE_THREAD using clone syscall directly will eventually exit the
whole group altogether instead of just the thread created. Also,
s390, microblaze, ia64, i386, and m68k differs by calling exit
syscall directly.
This patch changes all architectures to call the exit syscall
directly, as for s390, microblaze, ia64, i386, and m68k. This do not
have change glibc internal behavior in any sort, since the only
usage of clone implementation in posix_spawn calls _exit directly
in the created child (fork uses a direct call to clone).
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
powerpc-linux-gnu, powerpc64le-linux-gnu, sparc64-linux-gnu,
and sparcv9-linux-gnu.
[BZ #21512]
* sysdeps/unix/sysv/linux/aarch64/clone.S (__clone): Call exit
syscall instead of jump to _exit.
(CLONE_VM_BIT): Remove unused define.
(CLONE_VM): Likewise.
(CLONE_THREAD_BIT): Likewise.
(CLONE_THREAD): Likewise.
* sysdeps/unix/sysv/linux/alpha/clone.S (__clone): Likewise.
(CLONE_VM): Remove unused define.
* sysdeps/unix/sysv/linux/arm/clone.S (__clone): Likewise.
(CLONE_VM): Remove unused define.
(CLONE_THREAD): Likewise.
* sysdeps/unix/sysv/linux/i386/clone.S (CLONE_VM): Likewise.
* sysdeps/unix/sysv/linux/ia64/clone2.S (__clone2): Call exit
syscall instead of jump to _exit.
* sysdeps/unix/sysv/linux/hppa/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/mips/clone.S (__clone): Likewise.
(CLONE_VM): Remove unused define.
(CLONE_THREAD): Likewise.
* sysdeps/unix/sysv/linux/nios2/clone.S (__clone): Likewise.
(CLONE_VM): Remove unused define.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S (__clone):
Likewise.
(CLONE_VM): Remove unused define.
(CLONE_THREAD): Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S (__clone):
Likewise.
(CLONE_VM): Remove unused define.
(CLONE_THREAD): Likewise.
* sysdeps/unix/sysv/linux/sh/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/clone.S (__clone): Likewise.
(CLONE_VM): Remove unused define.
* sysdeps/unix/sysv/linux/sparc/sparc64/clone.S (__clone): Likewise.
(CLONE_VM): Remove unused define.
* sysdeps/unix/sysv/linux/tile/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/x86_64/clone.S (__clone): Likewise.
(CLONE_VM): Remove unused define.
* sysdeps/unix/sysv/linux/Makefile (tests): Add tst-clone3.
* sysdeps/unix/sysv/linux/tst-clone3.c: New file.
Fix
2017-06-22 11:49:34 +00:00
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ldiq v0, __NR_exit
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call_pal PAL_callsys
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1996-08-10 00:47:07 +00:00
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1997-01-20 02:49:42 +00:00
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/* Die horribly. */
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2014-05-21 21:36:45 +00:00
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.align 4
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1997-01-20 02:49:42 +00:00
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halt
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2014-05-21 21:36:45 +00:00
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.align 4
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2012-09-28 17:51:01 +00:00
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cfi_endproc
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1996-08-10 00:47:07 +00:00
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.end thread_start
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2016-01-19 19:33:32 +00:00
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libc_hidden_def (__clone)
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2005-05-26 14:30:48 +00:00
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weak_alias (__clone, clone)
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