diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/m68k/vfork.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/m68k/vfork.S | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/m68k/vfork.S b/ports/sysdeps/unix/sysv/linux/m68k/vfork.S new file mode 100644 index 0000000000..24e0c9037c --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/m68k/vfork.S @@ -0,0 +1,95 @@ +/* Copyright (C) 1999, 2002, 2003, 2010, 2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab <schwab@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> +#include <kernel-features.h> + +#ifndef SAVE_PID +#define SAVE_PID +#endif + +#ifndef RESTORE_PID +#define RESTORE_PID +#endif + +/* 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 + + /* SAVE_PID clobbers call-clobbered registers and + saves data in D1 and A1. */ + + SAVE_PID + + /* Pop the return PC value into A0. */ + movel %sp@+, %a0 + cfi_adjust_cfa_offset (-4) + cfi_register (%pc, %a0) + + /* Stuff the syscall number in D0 and trap into the kernel. */ + movel #SYS_ify (vfork), %d0 + trap #0 + + RESTORE_PID + + tstl %d0 + jmi .Lerror /* Branch forward if it failed. */ + + /* Jump to the return PC. */ + jmp %a0@ + +.Lerror: + /* Push back the return PC. */ + movel %a0,%sp@- + cfi_adjust_cfa_offset (4) + cfi_rel_offset (%pc, 0) + +# ifdef __ASSUME_VFORK_SYSCALL +# ifndef PIC + jbra SYSCALL_ERROR_LABEL +# endif +# else + /* Check if vfork syscall is known at all. */ + movel #-ENOSYS,%d1 + cmpl %d0,%d1 + jne SYSCALL_ERROR_LABEL + +# endif +#endif + +#ifndef __ASSUME_VFORK_SYSCALL + /* If we don't have vfork, fork is close enough. */ + + movel #SYS_ify (fork), %d0 + trap #0 + tstl %d0 + jmi SYSCALL_ERROR_LABEL + rts +#endif + +PSEUDO_END (__vfork) +libc_hidden_def (__vfork) + +weak_alias (__vfork, vfork) |