diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/am33/clone.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/am33/clone.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/am33/clone.S b/ports/sysdeps/unix/sysv/linux/am33/clone.S new file mode 100644 index 0000000000..e014c4ace9 --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/am33/clone.S @@ -0,0 +1,80 @@ +/* Copyright 2001 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> +#include <bp-sym.h> + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ + + .text +ENTRY (BP_SYM (__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 (BP_SYM (__clone)) + +weak_alias (BP_SYM (__clone), BP_SYM (clone)) |