diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/arm/vfork.S')
-rw-r--r-- | ports/sysdeps/unix/sysv/linux/arm/vfork.S | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/arm/vfork.S b/ports/sysdeps/unix/sysv/linux/arm/vfork.S new file mode 100644 index 0000000000..abd46c1c3b --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/arm/vfork.S @@ -0,0 +1,60 @@ +/* Copyright (C) 1999-2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Philip Blundell <philb@gnu.org>. + + 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/>. */ + +#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 SAVE_PID + SAVE_PID +#endif + /* The DO_CALL macro saves r7 on the stack, to enable generation + of ARM unwind info. Since the stack is initially shared between + parent and child of vfork, that saved value could be corrupted. + To avoid this problem, we save r7 into ip as well, and restore + from there. */ + mov ip, r7 + cfi_register (r7, ip) + .fnstart + str r7, [sp, #-4]! + cfi_adjust_cfa_offset (4) + .save { r7 } + ldr r7, =SYS_ify (vfork) + swi 0x0 + .fnend + add sp, sp, #4 + cfi_adjust_cfa_offset (-4) + mov r7, ip + cfi_restore (r7); +#ifdef RESTORE_PID + RESTORE_PID +#endif + cmn a1, #4096 + RETINSTR(cc, lr) + + b PLTJMP(SYSCALL_ERROR) +PSEUDO_END (__vfork) +libc_hidden_def (__vfork) + +weak_alias (__vfork, vfork) |