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/* Wrapper around clone system call. 64 bit S/390 version.
Copyright (C) 2001 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* 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>
#define _ERRNO_H 1
#include <bits/errno.h>
.text
ENTRY(__clone)
/* Sanity check arguments & move registers */
ltgr %r1,%r2 /* no NULL function pointers */
lghi %r2,-EINVAL
jz SYSCALL_ERROR_LABEL
ltgr %r3,%r3 /* no NULL stack pointers */
jz SYSCALL_ERROR_LABEL
/* move child_stack and flags, then call SVC */
lgr %r2,%r3
lgr %r3,%r4
svc SYS_ify(clone)
ltgr %r2,%r2 /* check return code */
jm SYSCALL_ERROR_LABEL
jz thread_start
br %r14
thread_start:
/* fn is in gpr 1, arg in gpr 5 */
lgr %r2,%r5 /* set first parameter to void *arg */
sgr %r11,%r11 /* terminate the stack frame */
aghi %r15,-160 /* make room on the stack for the save area */
basr %r14,%r1 /* jump to fn */
#ifdef PIC
larl %r12,_GLOBAL_OFFSET_TABLE_
#endif
jg _exit@PLT /* branch to _exit -> thread termination */
PSEUDO_END (__clone)
weak_alias (__clone, clone)
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