mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
81 lines
2.1 KiB
ArmAsm
81 lines
2.1 KiB
ArmAsm
|
/* Copyright (C) 1996 Free Software Foundation, Inc.
|
||
|
|
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., 675 Mass Ave,
|
||
|
|
Cambridge, MA 02139, 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>
|
||
|
|
#include <errnos.h>
|
||
|
|
|
||
|
|
/* int clone(int (*fn)(), void *child_stack, int flags, int nargs, ...) */
|
||
|
|
|
||
|
|
.text
|
||
|
|
ENTRY(__clone)
|
||
|
|
/* Sanity check arguments. */
|
||
|
|
movl $-EINVAL,%eax
|
||
|
|
movl 4(%esp),%ecx /* no NULL function pointers */
|
||
|
|
testl %ecx,%ecx
|
||
|
|
jz syscall_error
|
||
|
|
movl 8(%esp),%ecx /* no NULL stack pointers */
|
||
|
|
testl %ecx,%ecx
|
||
|
|
jz syscall_error
|
||
|
|
movl 16(%esp),%edx /* no negative argument counts */
|
||
|
|
testl %edx,%edx
|
||
|
|
js syscall_error
|
||
|
|
|
||
|
|
/* Allocate space on the new stack and copy args over */
|
||
|
|
movl %edx,%eax
|
||
|
|
negl %eax
|
||
|
|
lea -4(%ecx,%eax,4),%ecx
|
||
|
|
jz 2f
|
||
|
|
1: movl 16(%esp,%edx,4),%eax
|
||
|
|
movl %eax,0(%ecx,%edx,4)
|
||
|
|
dec %edx
|
||
|
|
jnz 1b
|
||
|
|
2:
|
||
|
|
/* 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
|
||
|
|
jz thread_start
|
||
|
|
|
||
|
|
ret
|
||
|
|
|
||
|
|
SYSCALL_ERROR_HANDLER
|
||
|
|
|
||
|
|
thread_start:
|
||
|
|
subl %ebp,%ebp /* terminate the stack frame */
|
||
|
|
call *%ebx
|
||
|
|
#ifdef PIC
|
||
|
|
call _exit@PLT
|
||
|
|
#else
|
||
|
|
call _exit
|
||
|
|
#endif
|
||
|
|
|
||
|
|
weak_alias(__clone, clone)
|