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glibc/sysdeps/unix/sysv/linux/s390/s390-32/clone.S
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/* Copyright (C) 2000-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). | |
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/>. */ | |
/* clone is even more special than fork as it mucks with stacks | |
and invokes a function in the right context after its all over. */ | |
#include <sysdep.h> | |
#include <tls.h> | |
#define _ERRNO_H 1 | |
#include <bits/errno.h> | |
/* int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, | |
pid_t *parent_tid, void *tls, pid_t *child_tid); */ | |
/* sys_clone (void *child_stack, unsigned long flags, | |
pid_t *parent_tid, pid_t *child_tid, void *tls); */ | |
.text | |
ENTRY(__clone) | |
st %r6,24(%r15) /* store %r6 to save area */ | |
cfi_offset (%r6, -72) | |
lr %r0,%r5 /* move *arg out of the way */ | |
ltr %r1,%r2 /* check fn and move to %r1 */ | |
jz error /* no NULL function pointers */ | |
ltr %r2,%r3 /* check child_stack and move to %r2 */ | |
jz error /* no NULL stack pointers */ | |
lr %r3,%r4 /* move flags to %r3 */ | |
lr %r4,%r6 /* move parent_tid to %r4 */ | |
l %r5,100(%r15) /* load child_tid from stack */ | |
l %r6,96(%r15) /* load tls from stack */ | |
svc SYS_ify(clone) | |
ltr %r2,%r2 /* check return code */ | |
jz thread_start | |
l %r6,24(%r15) /* restore %r6 */ | |
jm SYSCALL_ERROR_LABEL | |
br %r14 | |
error: | |
lhi %r2,-EINVAL | |
j SYSCALL_ERROR_LABEL | |
PSEUDO_END (__clone) | |
thread_start: | |
tmh %r3,1 /* CLONE_THREAD == 0x00010000 */ | |
jne 1f | |
lhi %r2,-1 | |
tml %r3,256 /* CLONE_VM == 0x00000100 */ | |
jne 2f | |
svc SYS_ify(getpid) | |
2: ear %r3,%a0 | |
st %r2,PID(%r3) | |
st %r2,TID(%r3) | |
1: | |
/* fn is in gpr 1, arg in gpr 0 */ | |
lr %r2,%r0 /* set first parameter to void *arg */ | |
ahi %r15,-96 /* make room on the stack for the save area */ | |
xc 0(4,%r15),0(%r15) | |
basr %r14,%r1 /* jump to fn */ | |
DO_CALL (exit, 1) | |
libc_hidden_def (__clone) | |
weak_alias (__clone, clone) |