Tue Feb 13 05:12:02 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>

* sysdeps/unix/sysv/linux/Makefile [$(subdir)=math]
	(sysdep_routines): Append setfpucw.
	(extra-objs): Append ieee-fpucw.o.
	(install-lib): Append libieee.a.
	(libieee.a): New target.
	* sysdeps/unix/sysv/linux/ieee-fpucw.c: New file.
	* sysdeps/unix/sysv/linux/i386/fpu_control.h
	(_FPU_GETCW, _FPU_SETCW): New macros.
	(fpu_control_t): New typedef.
	(__setfpucw): Use fpu_control_t for argument type.
	* sysdeps/unix/sysv/linux/fpu_control.c: Moved from linux/i386.

	* sysdeps/unix/sysv/linux/init-first.c: Moved from linux/i386.
	* sysdeps/unix/sysv/linux/Makefile [$(subdir)=math]
	(sysdep_routines): Append setfpucw.
	(extra-objs): Append ieee-fpucw.o.
	(install-lib): Append libieee.a.
	(libieee.a): New target.
	* sysdeps/unix/sysv/linux/ieee-fpucw.c: New file.
	* sysdeps/unix/sysv/linux/i386/fpu_control.h
	(_FPU_GETCW, _FPU_SETCW): New macros.
	(fpu_control_t): New typedef.
	(__setfpucw): Use fpu_control_t for argument type.
	* sysdeps/unix/sysv/linux/fpu_control.c: Moved from linux/i386.

	* sysdeps/unix/sysv/linux/init-first.c: Moved from linux/i386.

ChangeLog

@@ -1,5 +1,19 @@
 Tue Feb 13 05:12:02 1996  Roland McGrath  <roland@charlie-brown.gnu.ai.mit.edu>
 
+	* sysdeps/unix/sysv/linux/Makefile [$(subdir)=math]
+	(sysdep_routines): Append setfpucw.
+	(extra-objs): Append ieee-fpucw.o.
+	(install-lib): Append libieee.a.
+	(libieee.a): New target.
+	* sysdeps/unix/sysv/linux/ieee-fpucw.c: New file.
+	* sysdeps/unix/sysv/linux/i386/fpu_control.h
+	(_FPU_GETCW, _FPU_SETCW): New macros.
+	(fpu_control_t): New typedef.
+	(__setfpucw): Use fpu_control_t for argument type.
+	* sysdeps/unix/sysv/linux/fpu_control.c: Moved from linux/i386.
+
+	* sysdeps/unix/sysv/linux/init-first.c: Moved from linux/i386.
+
 	* sysdeps/unix/sysv/linux/syscalls.list: Add ipc syscall.
 	* sysdeps/unix/sysv/linux/i386/syscalls.list: File removed.
 

sysdeps/unix/sysv/linux/Makefile

@@ -1,3 +1,13 @@
+ifeq ($(subdir), math)
+sysdep_routines += setfpucw
+extra-objs += ieee-fpucw.o
+install-lib += libieee.a
+
+$(objpfx)libieee.a: $(objpfx)ieee-fpucw.o
+	rm -f $@
+	ln $< $@
+endif
+
 ifeq ($(subdir), io)
 sysdep_routines += fxstat lxstat xstat
 endif
@@ -7,17 +17,13 @@ sysdep_routines += xmknod mount umount s_ptrace
 headers += sys/mount.h
 endif
 
-#ifeq ($(subdir), posix)
-#sysdep_routines := $(sysdep_routines) setpgrp
-#endif
-
 ifeq ($(subdir), time)
-sysdep_routines := $(sysdep_routines) adjtimex
+sysdep_routines += adjtimex
 headers += sys/timex.h
 endif
 
 ifeq ($(subdir), sysvipc)
-sysdep_routines := $(sysdep_routines) ipc
+sysdep_routines += ipc
 endif
 
 ifeq ($(subdir), socket)

sysdeps/unix/sysv/linux/i386/Makefile

@@ -1,7 +0,0 @@
-ifeq ($(subdir), misc)
-sysdep_routines := $(sysdep_routines) fpu_control setfpucw
-
-extra-libs := $(extra-libs) libieee
-libieee-routines := ieee_fpu
-libieee-inhibit-o := .so .po
-endif

sysdeps/unix/sysv/linux/i386/fpu_control.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1995 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
 This file is part of the GNU C Library.
 Contributed by Olaf Flebbe.
 
@@ -87,13 +87,20 @@ Boston, MA 02111-1307, USA.  */
 /* IEEE:  same as above, but exceptions */
 #define _FPU_IEEE     0x137f
 
-/* private namespace. It should only be used in init-first.o. */
+/* Type of the control word.  */
-extern unsigned short __fpu_control;
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
+
+/* Macros for accessing the hardware control word.  */
+#define _FPU_GETCW(cw) __asm__ ("fnstcw %0" : "=m" (cw))
+#define _FPU_SETCW(cw) __asm__ ("fldcw %0" : "m" (cw))
+
+/* Default control word set at startup.  */
+extern fpu_control_t __fpu_control;
 
 __BEGIN_DECLS
 
-/* called in init-first.o. It can be used to manipulate 387 control word. */
+/* Called at startup.  It can be used to manipulate fpu control register.  */
-extern void __setfpucw __P ((unsigned short));
+extern void __setfpucw __P ((fpu_control_t));
 
 __END_DECLS
 

sysdeps/unix/sysv/linux/ieee-fpucw.c

@@ -1,5 +1,5 @@
-/* Default control word for ix86 FPU.
+/* Set default FPU control word for IEEE operation.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1996 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
@@ -14,7 +14,9 @@ Library General Public License for more details.
 
 You should have received a copy of the GNU Library General Public
 License along with the GNU C Library; see the file COPYING.LIB.  If
-not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Boston, MA 02111-1307, USA.  */
+Cambridge, MA 02139, USA.  */
 
-unsigned short __fpu_control = 0;
+#include "fpu_control.h"
+
+fpu_control_t __fpu_control = _FPU_IEEE;

sysdeps/unix/sysv/linux/init-first.c

@@ -1,5 +1,5 @@
-/* Initialization code run first thing by the ELF startup code.  i386/Linux
+/* Initialization code run first thing by the ELF startup code.  Linux version.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 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
@@ -21,6 +21,10 @@ Cambridge, MA 02139, USA.  */
 #include <sysdep.h>
 #include "fpu_control.h"
 
+/* This code is mostly the same for all machines.  This version works at
+   least for i386 and m68k, and probably any CISCy machine with a normal
+   stack arrangement.  */
+
 extern void __libc_init (int, char **, char **);
 extern void __libc_global_ctors (void);
 
@@ -32,6 +36,7 @@ init (int *data)
   char **argv = (void *) (data + 1);
   char **envp = &argv[argc + 1];
 
+#ifdef __i386__
   /* Make sure we are not using the iBSC2 personality.  The `personality'
      syscall takes one argument; zero means the Linux personality.  The
      argument arrives in %ebx; we have to save and restore %ebx by hand
@@ -42,6 +47,7 @@ init (int *data)
        "int $0x80 # syscall no %0\n"
        "popl %%ebx"
        : : "a" (SYS_ify (personality)));
+#endif
 
   /* Set the FPU control word to the proper default value.  */
   __setfpucw (__fpu_control);

sysdeps/unix/sysv/linux/setfpucw.c

@@ -0,0 +1,37 @@
+/* Set the FPU control word.
+Copyright (C) 1996 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
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "fpu_control.h"
+
+void
+__setfpucw (fpu_control_t set)
+{
+  fpu_control_t cw;
+
+  /* Fetch the current control word.  */
+  _FPU_GETCW (cw);
+
+  /* Preserve the reserved bits, and set the rest as the user
+     specified (or the default, if the user gave zero).  */
+  _FPU_SETCW ((cw & _FPU_RESERVED) | ((set ?: _FPU_DEFAULT) & ~_FPU_RESERVED));
+}
+
+/* The startup code in init-first.c calls __setfpucw (__fpu_control).  */
+
+fpu_control_t __fpu_control;