mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
82 lines
2.2 KiB
ArmAsm
82 lines
2.2 KiB
ArmAsm
/* Copyright 2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Alexandre Oliva <aoliva@redhat.com>.
|
|
Based on ../i386/clone.S.
|
|
|
|
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>
|
|
#include <bp-sym.h>
|
|
|
|
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
|
|
|
|
.text
|
|
ENTRY (BP_SYM (__clone))
|
|
/* Sanity check arguments. */
|
|
cmp 0,d0 /* no NULL function pointers */
|
|
beq L(error_inval)
|
|
cmp 0,d1 /* no NULL stack pointers */
|
|
beq L(error_inval)
|
|
|
|
/* Allocate room for a function call in the new stack, and
|
|
store fn and arg in it. They will be read back in
|
|
thread_start. */
|
|
mov d1,a0
|
|
sub 12,a0
|
|
mov d0,(a0)
|
|
mov (16,sp),d1
|
|
mov d1,(4,a0)
|
|
|
|
/* Do the system call */
|
|
mov a0,d1
|
|
mov (12,sp),a0
|
|
mov SYS_ify(clone),d0
|
|
syscall 0
|
|
|
|
cmp 0,d0
|
|
beq thread_start
|
|
blt L(to_SYSCALL_ERROR_LABEL)
|
|
|
|
L(pseudo_end):
|
|
ret
|
|
|
|
L(error_inval):
|
|
mov -EINVAL,d0
|
|
L(to_SYSCALL_ERROR_LABEL):
|
|
jmp SYSCALL_ERROR_LABEL
|
|
|
|
thread_start:
|
|
mov 0,a3 /* terminate the stack frame */
|
|
mov (4,sp),d0
|
|
mov (sp),a0
|
|
calls (a0)
|
|
#ifdef PIC
|
|
L(here):
|
|
mov pc,a2
|
|
add _GLOBAL_OFFSET_TABLE_-(L(here) - .),a2
|
|
#endif
|
|
call JUMPTARGET (_exit),[],0
|
|
|
|
PSEUDO_END (BP_SYM (__clone))
|
|
|
|
weak_alias (BP_SYM (__clone), BP_SYM (clone))
|