mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
e361ccd999
2002-12-20 Art Haas <ahaas@airmail.net> * sysdeps/gnu/siglist.c: Convert GCC extension initializer syntax to C99. 2002-12-21 Philip Blundell <philb@gnu.org> * sysdeps/arm/elf/start.S (_start): Optimise a little. Push stack top as seventh arg to __libc_start_main. Reported by paulnash@wildseed.com. * sysdeps/unix/sysv/linux/arm/clone.S: Small optimisation. * sysdeps/unix/sysv/linux/arm/sigcontextinfo.h: Elide compatibility cruft when new enough kernel is assumed.
61 lines
1.8 KiB
ArmAsm
61 lines
1.8 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 1998, 1999, 2002 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Pat Beirne <patb@corelcomputer.com>
|
|
|
|
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, 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>
|
|
|
|
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
|
|
|
|
.text
|
|
ENTRY(__clone)
|
|
@ sanity check args
|
|
cmp r0, #0
|
|
cmpne r1, #0
|
|
moveq r0, #-EINVAL
|
|
beq PLTJMP(syscall_error)
|
|
|
|
@ insert the args onto the new stack
|
|
str r3, [r1, #-4]!
|
|
str r0, [r1, #-4]!
|
|
|
|
@ do the system call
|
|
@ get flags
|
|
mov r0, r2
|
|
@ new sp is already in r1
|
|
swi SYS_ify(clone)
|
|
movs a1, a1
|
|
blt PLTJMP(C_SYMBOL_NAME(__syscall_error))
|
|
RETINSTR(movne, pc, lr)
|
|
|
|
@ pick the function arg and call address off the stack and execute
|
|
ldr r0, [sp, #4]
|
|
mov lr, pc
|
|
ldr pc, [sp]
|
|
|
|
@ and we are done, passing the return value through r0
|
|
b PLTJMP(_exit)
|
|
|
|
PSEUDO_END (__clone)
|
|
|
|
weak_alias (__clone, clone)
|