* 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.

ChangeLog

@@ -1,3 +1,15 @@
+2003-01-10  Andreas Schwab  <schwab@suse.de>
+
+	* 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.
+
 2003-01-09  Jakub Jelinek  <jakub@redhat.com>
 
 	* posix/test-vfork.c (noop): Add __attribute_noinline__.

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)

sysdeps/m68k/sysdep.h

@@ -1,5 +1,5 @@
 /* Assembler macros for m68k.
-   Copyright (C) 1998 Free Software Foundation, Inc.
+   Copyright (C) 1998, 2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -90,6 +90,7 @@
 # define PSEUDO_END(name)						      \
   END (name)
 
+# undef JUMPTARGET
 # ifdef PIC
 #  define JUMPTARGET(name)	name##@PLTPC
 # else

sysdeps/unix/sysv/linux/kernel-features.h

@@ -240,3 +240,12 @@
 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
 # define __ASSUME_CLONE_THREAD_FLAGS	1
 #endif
+
+/* These features were surely available with 2.4.12.  */
+#if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
+# define __ASSUME_MMAP2_SYSCALL		1
+# define __ASSUME_TRUNCATE64_SYSCALL	1
+# define __ASSUME_STAT64_SYSCALL	1
+# define __ASSUME_FCNTL64		1
+# define __ASSUME_VFORK_SYSCALL		1
+#endif