67 lines
2.4 KiB
ArmAsm
67 lines
2.4 KiB
ArmAsm
/* Wrapper around clone system call. 64 bit S/390 version.
|
|
Copyright (C) 2001-2016 Free Software Foundation, Inc.
|
|
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
|
|
This file is part of the GNU C Library.
|
|
|
|
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)
|
|
stg %r6,48(%r15) /* store %r6 to save area */
|
|
cfi_offset (%r6,-112)
|
|
lgr %r0,%r5 /* move *arg out of the way */
|
|
ltgr %r1,%r2 /* check fn and move to %r1 */
|
|
jz error /* no NULL function pointers */
|
|
ltgr %r2,%r3 /* check child_stack and move to %r2 */
|
|
jz error /* no NULL stack pointers */
|
|
lgr %r3,%r4 /* move flags to %r3 */
|
|
lgr %r4,%r6 /* move parent_tid to %r4 */
|
|
lg %r5,168(%r15) /* load child_tid from stack */
|
|
lg %r6,160(%r15) /* load tls from stack */
|
|
svc SYS_ify(clone)
|
|
ltgr %r2,%r2 /* check return code */
|
|
jz thread_start
|
|
lg %r6,48(%r15) /* restore %r6 */
|
|
jgm SYSCALL_ERROR_LABEL
|
|
br %r14
|
|
error:
|
|
lghi %r2,-EINVAL
|
|
jg SYSCALL_ERROR_LABEL
|
|
PSEUDO_END (__clone)
|
|
|
|
thread_start:
|
|
/* fn is in gpr 1, arg in gpr 0 */
|
|
lgr %r2,%r0 /* set first parameter to void *arg */
|
|
aghi %r15,-160 /* make room on the stack for the save area */
|
|
xc 0(8,%r15),0(%r15)
|
|
basr %r14,%r1 /* jump to fn */
|
|
DO_CALL (exit, 1)
|
|
|
|
libc_hidden_def (__clone)
|
|
weak_alias (__clone, clone)
|