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| author | Andreas Schwab <schwab@suse.de> | 2003-01-10 14:09:38 +0000 |
|---|---|---|
| committer | Andreas Schwab <schwab@suse.de> | 2003-01-10 14:09:38 +0000 |
| commit | c2918f01e1a560383964696e410e2aa2ae4209f7 (patch) | |
| tree | d2ab9eb0b60c195c1d13cfa0378a44941a02a335 /linuxthreads/sysdeps/unix | |
| parent | b2222ac61c7bfa221fc9ca88a48940af75016ed2 (diff) | |
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* sysdeps/unix/sysv/linux/m68k/vfork.S: Optimize for kernels which
are known to have the vfork syscall.
* sysdeps/m68k/sysdep.h (JUMPTARGET): Undefine before defining it.
* sysdeps/unix/sysv/linux/kernel-features.h
(__ASSUME_MMAP2_SYSCALL, __ASSUME_TRUNCATE64_SYSCALL)
(__ASSUME_STAT64_SYSCALL, __ASSUME_FCNTL64)
(__ASSUME_VFORK_SYSCALL): Define for m68k kernels >= 2.4.12.
Diffstat (limited to 'linuxthreads/sysdeps/unix')
| -rw-r--r-- | linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S b/linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S new file mode 100644 index 0000000000..ba25cb1f3b --- /dev/null +++ b/linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S @@ -0,0 +1,79 @@ +/* Copyright (C) 1999, 2002, 2003 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep-cancel.h> +#define _ERRNO_H 1 +#include <bits/errno.h> +#include <kernel-features.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 + + SINGLE_THREAD_P + jbne HIDDEN_JUMPTARGET (__fork) + + /* Pop the return PC value into A0. */ + movel %sp@+, %a0 + + /* Stuff the syscall number in D0 and trap into the kernel. */ + movel #SYS_ify (vfork), %d0 + trap #0 + 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@- + +# 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) |