diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sh/vfork.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/sh/vfork.S | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sh/vfork.S b/sysdeps/unix/sysv/linux/sh/vfork.S new file mode 100644 index 0000000..27381fb --- /dev/null +++ b/sysdeps/unix/sysv/linux/sh/vfork.S @@ -0,0 +1,112 @@ +/* Copyright (C) 1999, 2000 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., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* Clone the calling process, but without copying the whole address space. + The calling process is suspended until the new process exits or is + replaced by a call to `execve'. Return -1 for errors, 0 to the new process, + and the process ID of the new process to the old process. */ + +ENTRY (__vfork) + +#ifdef __NR_vfork + mov #+__NR_vfork, r0 + trapa #0 + mov r0, r1 + mov #-12, r2 + shad r2, r1 + not r1, r1 // r1=0 means r0 = -1 to -4095 + tst r1, r1 // i.e. error in linux + bf 1f + mov.w .L1, r1 + cmp/eq r1, r0 + bt 2f + mov.l .L2, r1 +#ifdef SHARED + mov r0, r4 + mov.l r12, @-r15 + sts.l pr, @-r15 + mov.l 0f, r12 + mova 0f, r0 + add r0, r12 + mova .L2, r0 + add r0, r1 + jsr @r1 + nop + lds.l @r15+, pr + rts + mov.l @r15+, r12 + .align 2 +0: + .long _GLOBAL_OFFSET_TABLE_ +#else + jmp @r1 + mov r0, r4 +#endif +.L1: + .word -ENOSYS +1: + rts + nop +2: +#endif + + /* If we don't have vfork, fork is close enough. */ + mov #+__NR_fork, r0 + trapa #0 + mov r0, r1 + mov #-12, r2 + shad r2, r1 + not r1, r1 // r1=0 means r0 = -1 to -4095 + tst r1, r1 // i.e. error in linux + bf 1f + mov.l .L2, r1 +#ifdef SHARED + mov r0, r4 + mov.l r12, @-r15 + sts.l pr, @-r15 + mov.l 0f, r12 + mova 0f, r0 + add r0, r12 + mova .L2, r0 + add r0, r1 + jsr @r1 + nop + lds.l @r15+, pr + rts + mov.l @r15+, r12 + .align 2 +0: + .long _GLOBAL_OFFSET_TABLE_ +#else + jmp @r1 + mov r0, r4 +#endif + .align 2 +.L2: + .long PLTJMP(C_SYMBOL_NAME(__syscall_error)) +1: + rts + nop + +PSEUDO_END (__vfork) + +weak_alias (__vfork, vfork) |