88 lines
2.3 KiB
ArmAsm
88 lines
2.3 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Richard Henderson (rth@tamu.edu)
|
|
|
|
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>
|
|
#include <asm-syntax.h>
|
|
|
|
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
|
|
|
|
.text
|
|
ENTRY(__clone)
|
|
/* Sanity check arguments. */
|
|
movl $-EINVAL,%eax
|
|
movl 4(%esp),%ecx /* no NULL function pointers */
|
|
#ifdef PIC
|
|
jecxz SYSCALL_ERROR_LABEL
|
|
#else
|
|
testl %ecx,%ecx
|
|
jz SYSCALL_ERROR_LABEL
|
|
#endif
|
|
movl 8(%esp),%ecx /* no NULL stack pointers */
|
|
#ifdef PIC
|
|
jecxz SYSCALL_ERROR_LABEL
|
|
#else
|
|
testl %ecx,%ecx
|
|
jz SYSCALL_ERROR_LABEL
|
|
#endif
|
|
|
|
/* Insert the argument onto the new stack. */
|
|
subl $8,%ecx
|
|
movl 16(%esp),%eax /* no negative argument counts */
|
|
movl %eax,4(%ecx)
|
|
|
|
/* Save the function pointer as the zeroth argument.
|
|
It will be popped off in the child in the ebx frobbing below. */
|
|
movl 4(%esp),%eax
|
|
movl %eax,0(%ecx)
|
|
|
|
/* Do the system call */
|
|
pushl %ebx
|
|
movl 16(%esp),%ebx
|
|
movl $SYS_ify(clone),%eax
|
|
int $0x80
|
|
popl %ebx
|
|
|
|
test %eax,%eax
|
|
jl SYSCALL_ERROR_LABEL
|
|
jz thread_start
|
|
|
|
L(pseudo_end):
|
|
ret
|
|
|
|
thread_start:
|
|
subl %ebp,%ebp /* terminate the stack frame */
|
|
call *%ebx
|
|
#ifdef PIC
|
|
call L(here)
|
|
L(here):
|
|
popl %ebx
|
|
addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebx
|
|
#endif
|
|
pushl %eax
|
|
call JUMPTARGET (_exit)
|
|
|
|
PSEUDO_END (__clone)
|
|
|
|
weak_alias (__clone, clone)
|