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Optimize for kernels which are known to have the vfork syscall.

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This commit is contained in:
Andreas Schwab 2003-01-10 14:05:26 +00:00
parent 29d9a17dba
commit b2222ac61c
1 changed files with 10 additions and 1 deletions
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11
sysdeps/unix/sysv/linux/m68k/vfork.S
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@ -1,4 +1,4 @@
/* Copyright (C) 1999, 2002 Free Software Foundation, Inc.
/* 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>.
@ -20,6 +20,7 @@
#include <sysdep.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
@ -46,13 +47,20 @@ ENTRY (__vfork)
/* 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
@ -60,6 +68,7 @@ ENTRY (__vfork)
tstl %d0
jmi SYSCALL_ERROR_LABEL
rts
#endif
PSEUDO_END (__vfork)
libc_hidden_def (__vfork)