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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. This file is part of the GNU C Library.
Contributed by Andreas Schwab <schwab@gnu.org>. Contributed by Andreas Schwab <schwab@gnu.org>.
@ -20,6 +20,7 @@
#include <sysdep.h> #include <sysdep.h>
#define _ERRNO_H 1 #define _ERRNO_H 1
#include <bits/errno.h> #include <bits/errno.h>
#include <kernel-features.h>
/* Clone the calling process, but without copying the whole address space. /* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is The calling process is suspended until the new process exits or is
@ -46,13 +47,20 @@ ENTRY (__vfork)
/* Push back the return PC. */ /* Push back the return PC. */
movel %a0,%sp@- movel %a0,%sp@-
# ifdef __ASSUME_VFORK_SYSCALL
# ifndef PIC
jbra SYSCALL_ERROR_LABEL
# endif
# else
/* Check if vfork syscall is known at all. */ /* Check if vfork syscall is known at all. */
movel #-ENOSYS,%d1 movel #-ENOSYS,%d1
cmpl %d0,%d1 cmpl %d0,%d1
jne SYSCALL_ERROR_LABEL jne SYSCALL_ERROR_LABEL
# endif
#endif #endif
#ifndef __ASSUME_VFORK_SYSCALL
/* If we don't have vfork, fork is close enough. */ /* If we don't have vfork, fork is close enough. */
movel #SYS_ify (fork), %d0 movel #SYS_ify (fork), %d0
@ -60,6 +68,7 @@ ENTRY (__vfork)
tstl %d0 tstl %d0
jmi SYSCALL_ERROR_LABEL jmi SYSCALL_ERROR_LABEL
rts rts
#endif
PSEUDO_END (__vfork) PSEUDO_END (__vfork)
libc_hidden_def (__vfork) libc_hidden_def (__vfork)