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glibc/sysdeps/unix/sysv/linux/microblaze/clone.S
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/* Copyright (C) 1996-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
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. */ | |
#include <sysdep.h> | |
#define _ERRNO_H 1 | |
#include <bits/errno.h> | |
/* int clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg, | |
pid_t *ptid, struct user_desc *tls, pid_t *ctid); | |
INCOMING: r5 (fn), r6 (child_stack), r7 (flags), r8 (arg), r9 (ptid) | |
r10 (tls), 28 (r1) ctid | |
OUTGOING: | |
linux: arch/microblaze/entry.S: sys_clone expects | |
r5 (flags) r6 (child stack) r7 (stack_size) r8 (ptid)r9 (ctid) | |
r10 (tls) | |
*/ | |
.text | |
ENTRY (__clone) | |
addik r3,r0,-EINVAL | |
beqi r5,SYSCALL_ERROR_LABEL ; // Invalid func | |
beqi r6,SYSCALL_ERROR_LABEL ; // Invalid stack | |
addik r6,r6,-8 | |
swi r5,r6,0 ; // Push fn onto child's stack | |
swi r8,r6,4 ; // Push arg for child | |
addk r5,r0,r7 ; // flags for clone() syscall | |
addk r7,r0,r0 | |
addk r8,r0,r9 ; // parent tid ptr | |
lwi r9,r1,28 ; // child tid ptr | |
addik r12,r0,SYS_ify(clone) | |
brki r14,8 | |
addk r0,r0,r0 | |
addik r4,r0,-4095 | |
cmpu r4,r4,r3 | |
bgei r4,SYSCALL_ERROR_LABEL | |
beqi r3,L(thread_start) | |
rtsd r15,8 | |
nop | |
L(thread_start): | |
lwi r12,r1,0 ; // fn | |
lwi r5,r1,4 ; // arg | |
brald r15,r12 | |
nop | |
addk r5,r0,r3 | |
addik r12,r0,SYS_ify(exit) | |
brki r14,8 | |
nop | |
PSEUDO_END(__clone) | |
libc_hidden_def (__clone) | |
weak_alias (__clone,clone) |