From c2918f01e1a560383964696e410e2aa2ae4209f7 Mon Sep 17 00:00:00 2001
From: Andreas Schwab <schwab@suse.de>
Date: Fri, 10 Jan 2003 14:09:38 +0000
Subject: [PATCH] * 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                                         | 12 ++++
 linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S | 79 +++++++++++++++++++++++
 sysdeps/m68k/sysdep.h                             | 65 ++++++++++---------
 sysdeps/unix/sysv/linux/kernel-features.h         |  9 +++
 4 files changed, 133 insertions(+), 32 deletions(-)
 create mode 100644 linuxthreads/sysdeps/unix/sysv/linux/m68k/vfork.S

diff --git a/ChangeLog b/ChangeLog
index 134ab27..75de7c7 100644
--- a/ChangeLog
+++ b/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__.
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 0000000..ba25cb1
--- /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)
diff --git a/sysdeps/m68k/sysdep.h b/sysdeps/m68k/sysdep.h
index 554b92d..f492ff6 100644
--- a/sysdeps/m68k/sysdep.h
+++ b/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
@@ -23,25 +23,25 @@
 
 /* Syntactic details of assembler.  */
 
-#ifdef HAVE_ELF
+# ifdef HAVE_ELF
 
 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
-#define ALIGNARG(log2) 1<<log2
+#  define ALIGNARG(log2) 1<<log2
 /* For ELF we need the `.type' directive to make shared libs work right.  */
-#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
-#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
+#  define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
+#  define ASM_SIZE_DIRECTIVE(name) .size name,.-name
 
 /* In ELF C symbols are asm symbols.  */
-#undef	NO_UNDERSCORES
-#define NO_UNDERSCORES
+#  undef NO_UNDERSCORES
+#  define NO_UNDERSCORES
 
-#else
+# else
 
-#define ALIGNARG(log2) log2
-#define ASM_TYPE_DIRECTIVE(name,type)	/* Nothing is specified.  */
-#define ASM_SIZE_DIRECTIVE(name)	/* Nothing is specified.  */
+#  define ALIGNARG(log2) log2
+#  define ASM_TYPE_DIRECTIVE(name,type)	/* Nothing is specified.  */
+#  define ASM_SIZE_DIRECTIVE(name)	/* Nothing is specified.  */
 
-#endif
+# endif
 
 
 /* Define an entry point visible from C.
@@ -49,51 +49,52 @@
    There is currently a bug in gdb which prevents us from specifying
    incomplete stabs information.  Fake some entries here which specify
    the current source file.  */
-#define	ENTRY(name)							      \
+# define ENTRY(name)							      \
   .globl C_SYMBOL_NAME(name);						      \
   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function);			      \
   .align ALIGNARG(2);							      \
   C_LABEL(name)								      \
   CALL_MCOUNT
 
-#undef END
-#define END(name) ASM_SIZE_DIRECTIVE(name)
+# undef END
+# define END(name) ASM_SIZE_DIRECTIVE(name)
 
 
 /* If compiled for profiling, call `_mcount' at the start of each function.  */
-#ifdef	PROF
+# ifdef	PROF
 /* The mcount code relies on a normal frame pointer being on the stack
    to locate our caller, so push one just for its benefit.  */
-#define CALL_MCOUNT \
+#  define CALL_MCOUNT \
   move.l %fp, -(%sp); move.l %sp, %fp;					      \
   jbsr JUMPTARGET (mcount);						      \
   move.l (%sp)+, %fp;
-#else
-#define CALL_MCOUNT		/* Do nothing.  */
-#endif
+# else
+#  define CALL_MCOUNT		/* Do nothing.  */
+# endif
 
-#ifdef	NO_UNDERSCORES
+# ifdef	NO_UNDERSCORES
 /* Since C identifiers are not normally prefixed with an underscore
    on this system, the asm identifier `syscall_error' intrudes on the
    C name space.  Make sure we use an innocuous name.  */
-#define	syscall_error	__syscall_error
-#define mcount		_mcount
-#endif
+#  define syscall_error	__syscall_error
+#  define mcount	_mcount
+# endif
 
-#define	PSEUDO(name, syscall_name, args)				      \
+# define PSEUDO(name, syscall_name, args)				      \
   .globl syscall_error;							      \
   ENTRY (name)								      \
     DO_CALL (syscall_name, args);					      \
     jcc JUMPTARGET(syscall_error)
 
-#undef PSEUDO_END
-#define PSEUDO_END(name)						      \
+# undef PSEUDO_END
+# define PSEUDO_END(name)						      \
   END (name)
 
-#ifdef PIC
-#define JUMPTARGET(name)	name##@PLTPC
-#else
-#define JUMPTARGET(name)	name
-#endif
+# undef JUMPTARGET
+# ifdef PIC
+#  define JUMPTARGET(name)	name##@PLTPC
+# else
+#  define JUMPTARGET(name)	name
+# endif
 
 #endif	/* __ASSEMBLER__ */
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index c93ab35..6b1bdf2 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/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
-- 
2.7.4