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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)
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