| /* Copyright (C) 1996-2014 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) |
| |
| weak_alias (__clone,clone) |
