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/* Copyright (C) 2000 Free Software Foundation, Inc.
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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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>
/*int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg);*/
/* sys_clone(void *child_stack, unsigned long flags) */
.text
ENTRY(__clone)
/* Sanity check arguments & move registers */
ltr %r1,%r2 /* no NULL function pointers */
lhi %r2,-EINVAL
jz SYSCALL_ERROR_LABEL
ltr %r3,%r3 /* no NULL stack pointers */
jz SYSCALL_ERROR_LABEL
/* move child_stack and flags, then call SVC */
lr %r2,%r3
lr %r3,%r4
svc SYS_ify(clone)
ltr %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 */
lr %r2,%r5 /* set first parameter to void *arg */
sr %r11,%r11 /* terminate the stack frame */
ahi %r15,-96 /* make room on the stack for the save area */
basr %r14,%r1 /* jump to fn */
#ifdef PIC
basr %r12,0
.L0: lr %r1,%r12
al %r12,.L1-.L0(%r12)
al %r1,.L2-.L0(%r1)
br %r1 /* branch to _exit -> thread termination */
.L1: .long _GLOBAL_OFFSET_TABLE_ - .L0
.L2: .long _exit@PLT - .L0
#else
basr %r1,0
.L0: al %r1,.L1-.L0(0,%r1)
br %r1 /* branch to _exit -> thread termination */
.L1: .long _exit - .L0
#endif
PSEUDO_END (__clone)
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