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/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
Copyright (C) 2001 Hewlett-Packard Australia
This program 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.
This program 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 this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Derived in part from the Linux-8086 C library, the GNU C Library, and several
other sundry sources. Files within this library are copyright by their
respective copyright holders.
*/
#include <features.h>
#include <sys/syscall.h>
#define _ERRNO_H
#include <bits/errno.h>
#include <bits/sysnum.h>
/* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
and the process ID of the new process to the old process. */
.text
.globl __vfork
.hidden __vfork
.type __vfork,@function
.align 4
__vfork:
mov.w .L2, r3
trapa #__SH_SYSCALL_TRAP_BASE
mov r0, r1
#ifdef __sh2__
/* 12 arithmetic shifts for the crappy sh2, because shad doesn't exist! */
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
#else
mov #-12, r2
shad r2, r1
#endif
not r1, r1 /* r1=0 means r0 = -1 to -4095 */
tst r1, r1 /* i.e. error in linux */
bf 2f
mov.w .L1, r1
cmp/eq r1, r0
bf/s __syscall_error
mov r0, r4
/* If we don't have vfork, use fork. */
mov.w .L3, r3
trapa #__SH_SYSCALL_TRAP_BASE
mov r0, r1
#ifdef __sh2__
/* 12 arithmetic shifts for the crappy sh2, because shad doesn't exist! */
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
#else
mov #-12, r2
shad r2, r1
#endif
not r1, r1 /* r1=0 means r0 = -1 to -4095 */
tst r1, r1 /* i.e. error in linux */
bt/s __syscall_error
mov r0, r4
2:
rts
nop
.align 2
.L1:
.word -ENOSYS
.L2:
.word __NR_vfork
.L3:
.word __NR_fork
.size __vfork, .-__vfork
weak_alias(__vfork,vfork)
libc_hidden_weak(vfork)
#include "syscall_error.S"
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