| /* Copyright 2001-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Alexandre Oliva <aoliva@redhat.com>. |
| Based on ../i386/clone.S. |
| |
| 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. 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> |
| #include <asm-syntax.h> |
| |
| /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ |
| |
| .text |
| ENTRY (__clone) |
| /* Sanity check arguments. */ |
| cmp 0,d0 /* no NULL function pointers */ |
| beq L(error_inval) |
| cmp 0,d1 /* no NULL stack pointers */ |
| beq L(error_inval) |
| |
| /* Allocate room for a function call in the new stack, and |
| store fn and arg in it. They will be read back in |
| thread_start. */ |
| mov d1,a0 |
| sub 12,a0 |
| mov d0,(a0) |
| mov (16,sp),d1 |
| mov d1,(4,a0) |
| |
| /* Do the system call */ |
| mov a0,d1 |
| mov (12,sp),a0 |
| mov SYS_ify(clone),d0 |
| syscall 0 |
| |
| cmp 0,d0 |
| beq thread_start |
| blt L(to_SYSCALL_ERROR_LABEL) |
| |
| L(pseudo_end): |
| ret |
| |
| L(error_inval): |
| mov -EINVAL,d0 |
| L(to_SYSCALL_ERROR_LABEL): |
| jmp SYSCALL_ERROR_LABEL |
| |
| thread_start: |
| mov 0,a3 /* terminate the stack frame */ |
| mov (4,sp),d0 |
| mov (sp),a0 |
| calls (a0) |
| #ifdef PIC |
| L(here): |
| mov pc,a2 |
| add _GLOBAL_OFFSET_TABLE_-(L(here) - .),a2 |
| #endif |
| call JUMPTARGET (_exit),[],0 |
| |
| PSEUDO_END (__clone) |
| |
| weak_alias (__clone, clone) |
