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/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
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. */
#define _ERRNO_H
#include <sysdep.h>
#include <features.h>
#include <bits/errno.h>
#include <sys/syscall.h>
#include "m68k_pic.S"
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
void *parent_tidptr, void *tls, void *child_tidptr) */
.text
.align 4
.globl __clone
.type __clone,@function
__clone:
/* Sanity check arguments. */
movel #-EINVAL, %d0
movel 4(%sp), %d1 /* no NULL function pointers */
movel %d1, %a0
tstl %d1
beq.w __syscall_error_trampoline
movel 8(%sp), %d1 /* no NULL stack pointers */
movel %d1, %a1
tstl %d1
beq.w __syscall_error_trampoline
/* Allocate space and copy the argument onto the new stack. */
movel 16(%sp), -(%a1)
/* Do the system call */
movel 12(%sp), %d1 /* get flags */
movel %d3, -(%a1) /* save %d3 and get parent_tidptr */
movel %d3, -(%sp)
cfi_adjust_cfa_offset (4)
cfi_rel_offset (%d3, 0)
movel 20+4(%sp), %d3
movel %d4, -(%a1) /* save %d4 and get child_tidptr */
movel %d4, -(%sp)
cfi_adjust_cfa_offset (4)
cfi_rel_offset (%d4, 0)
movel 28+8(%sp), %d4
movel %d5, -(%a1) /* save %d5 and get tls */
movel %d5, -(%sp)
cfi_adjust_cfa_offset (4)
cfi_rel_offset (%d5, 0)
movel 24+12(%sp), %d5
/* save %d2 and get stack pointer */
#ifdef __mcoldfire__
movel %d2, -(%a1)
movel %d2, -(%sp)
cfi_adjust_cfa_offset (4)
cfi_rel_offset (%d2, 0)
movel %a1, %d2
#else
exg %d2, %a1 /* save %d2 and get stack pointer */
cfi_register (%d2, %a1)
#endif
movel #__NR_clone, %d0
/* End FDE now, because in the child the unwind info will be
wrong. */
cfi_endproc
trap #0
#ifdef __mcoldfire__
movel (%sp)+, %d2
#else
exg %d2, %a1 /* restore %d2 */
#endif
movel (%sp)+, %d5 /* restore %d5, %d4 and %d3 */
movel (%sp)+, %d4
movel (%sp)+, %d3
tstl %d0
bmi.w __syscall_error_trampoline
beq.w thread_start
rts
thread_start:
cfi_startproc
cfi_undefined (pc) /* Mark end of stack */
subl %fp, %fp /* terminate the stack frame */
jsr (%a0)
movel %d0, %d1
movel #__NR_exit, %d0
trap #0
cfi_endproc
cfi_startproc
__syscall_error_trampoline:
JUMP __syscall_error,%a0
.size __clone,.-__clone
weak_alias(__clone,clone)
libc_hidden_def(clone)
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