diff options
Diffstat (limited to 'sysdeps/unix/arm')
| -rw-r--r-- | sysdeps/unix/arm/fork.S | 33 | ||||
| -rw-r--r-- | sysdeps/unix/arm/sysdep.h | 5 |
2 files changed, 38 insertions, 0 deletions
diff --git a/sysdeps/unix/arm/fork.S b/sysdeps/unix/arm/fork.S new file mode 100644 index 0000000000..baa33e31b7 --- /dev/null +++ b/sysdeps/unix/arm/fork.S @@ -0,0 +1,33 @@ +/* Copyright (C) 1991, 1992, 1994, 1995, 1997 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 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; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <sysdep.h> + +/* ARM version. */ + +SYSCALL__ (fork, 0) + /* R1 is now 0 for the parent and 1 for the child. Decrement it to + make it -1 (all bits set) for the parent, and 0 (no bits set) + for the child. Then AND it with R0, so the parent gets + R0&-1==R0, and the child gets R0&0==0. */ + sub r1, r1, $1 + and r0, r0, r1 + RETINSTR(mov, pc, r14) +PSEUDO_END(fork) + +weak_alias (__fork, fork) diff --git a/sysdeps/unix/arm/sysdep.h b/sysdeps/unix/arm/sysdep.h index 18e812b9f1..1c580731ba 100644 --- a/sysdeps/unix/arm/sysdep.h +++ b/sysdeps/unix/arm/sysdep.h @@ -19,3 +19,8 @@ Cambridge, MA 02139, USA. */ #include <sysdeps/unix/sysdep.h> #include <sysdeps/arm/sysdep.h> +/* Some definitions to allow the assembler in sysdeps/unix/*.S to build + without needing ARM-specific versions of all the files. */ + +#define ret RETINSTR(mov, pc, r14) +#define MOVE(a,b) mov b,a |