aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/m68k/fpu_control.h
diff options
context:
space:
mode:
authorRoland McGrath <roland@gnu.org>1996-06-16 03:49:40 +0000
committerRoland McGrath <roland@gnu.org>1996-06-16 03:49:40 +0000
commit5fbef188648f5150617e0a14f1011e600f1b3a0f (patch)
tree81334ea044e87bc2cf489cc8cb49adab73b9d6dd /sysdeps/m68k/fpu_control.h
parentf9496a7b54c27580d4b30cc2b2b40e86738b2b81 (diff)
downloadglibc-5fbef188648f5150617e0a14f1011e600f1b3a0f.tar
glibc-5fbef188648f5150617e0a14f1011e600f1b3a0f.tar.gz
glibc-5fbef188648f5150617e0a14f1011e600f1b3a0f.tar.bz2
glibc-5fbef188648f5150617e0a14f1011e600f1b3a0f.zip
* hurd/Makefile (routines): Add get-host, set-host.
(distribute): Add hurdhost.h. * hurd/hurdhost.h: New file. * sysdeps/mach/hurd/gethostname.c: Use _hurd_get_host_config. * sysdeps/mach/hurd/gethostid.c: Likewise. * sysdeps/mach/hurd/sethostname.c: Use _hurd_set_host_config. * sysdeps/mach/hurd/sethostid.c: Likewise. * hurd/get-host.c: New file. * hurd/set-host.c: New file. * math/Makefile (headers): Add fpu_control.h. (aux): New variable, list fpu_control and setfpucw. * sysdeps/generic/fpu_control.c: New file. * sysdeps/stub/fpu_control.h: New file. * sysdeps/unix/sysv/linux/m68k/fpu_control.h: Moved to ... * sysdeps/m68k/fpu_control.h: here. * sysdeps/unix/sysv/linux/i386/fpu_control.h: Moved to ... * sysdeps/i386/fpu_control.h: here. * sysdeps/unix/sysv/linux/alpha/fpu_control.h: Moved to ... * sysdeps/alpha/fpu/fpu_control.h: here. Fixed copyright. * sysdeps/unix/sysv/linux/alpha/Makefile (sysdep_routines): Remove setfpucw, fpu_control. * sysdeps/unix/sysv/linux/alpha/fpu_control.c: File removed. * sysdeps/unix/sysv/linux/setfpucw.c: Moved to ... * sysdeps/generic/setfpucw.c: here. (__fpu_control): Variable removed. (__setfpucw): Use SET even if zero.
Diffstat (limited to 'sysdeps/m68k/fpu_control.h')
-rw-r--r--sysdeps/m68k/fpu_control.h108
1 files changed, 108 insertions, 0 deletions
diff --git a/sysdeps/m68k/fpu_control.h b/sysdeps/m68k/fpu_control.h
new file mode 100644
index 0000000000..97bde853bc
--- /dev/null
+++ b/sysdeps/m68k/fpu_control.h
@@ -0,0 +1,108 @@
+/* 68k FPU control word definitions.
+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., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#ifndef _FPU_CONTROL_H
+#define _FPU_CONTROL_H
+
+/*
+ * Motorola floating point control register bits.
+ *
+ * 31-16 -> reserved (read as 0, ignored on write)
+ * 15 -> enable trap for BSUN exception
+ * 14 -> enable trap for SNAN exception
+ * 13 -> enable trap for OPERR exception
+ * 12 -> enable trap for OVFL exception
+ * 11 -> enable trap for UNFL exception
+ * 10 -> enable trap for DZ exception
+ * 9 -> enable trap for INEX2 exception
+ * 8 -> enable trap for INEX1 exception
+ * 7-6 -> Precision Control
+ * 5-4 -> Rounding Control
+ * 3-0 -> zero (read as 0, write as 0)
+ *
+ *
+ * Precision Control:
+ * 00 - round to extended precision
+ * 01 - round to single precision
+ * 10 - round to double precision
+ * 11 - undefined
+ *
+ * Rounding Control:
+ * 00 - rounding to nearest (RN)
+ * 01 - rounding toward zero (RZ)
+ * 10 - rounding (down)toward minus infinity (RM)
+ * 11 - rounding (up) toward plus infinity (RP)
+ *
+ * The hardware default is 0x0000. I choose 0x5400.
+ */
+
+#include <features.h>
+
+/* masking of interrupts */
+#define _FPU_MASK_BSUN 0x8000
+#define _FPU_MASK_SNAN 0x4000
+#define _FPU_MASK_OPERR 0x2000
+#define _FPU_MASK_OVFL 0x1000
+#define _FPU_MASK_UNFL 0x0800
+#define _FPU_MASK_DZ 0x0400
+#define _FPU_MASK_INEX1 0x0200
+#define _FPU_MASK_INEX2 0x0100
+
+/* precision control */
+#define _FPU_EXTENDED 0x00 /* RECOMMENDED */
+#define _FPU_DOUBLE 0x80
+#define _FPU_SINGLE 0x40 /* DO NOT USE */
+
+/* rounding control */
+#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */
+#define _FPU_RC_ZERO 0x10
+#define _FPU_RC_DOWN 0x20
+#define _FPU_RC_UP 0x30
+
+#define _FPU_RESERVED 0xFFFF000F /* Reserved bits in fpucr */
+
+
+/* Now two recommended fpucr */
+
+/* The fdlibm code requires no interrupts for exceptions. Don't
+ change the rounding mode, it would break long double I/O! */
+#define _FPU_DEFAULT 0x00000000
+
+/* IEEE: same as above, but exceptions. We must make it non-zero so
+ that __setfpucw works. This bit will be ignored. */
+#define _FPU_IEEE 0x00000001
+
+/* Type of the control word. */
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
+
+/* Macros for accessing the hardware control word. */
+#define _FPU_GETCW(cw) __asm__ ("fmove%.l %!, %0" : "=dm" (cw))
+#define _FPU_SETCW(cw) __asm__ volatile ("fmove%.l %0, %!" : : "dm" (cw))
+
+/* Default control word set at startup. */
+extern fpu_control_t __fpu_control;
+
+__BEGIN_DECLS
+
+/* Called at startup. It can be used to manipulate fpu control register. */
+extern void __setfpucw __P ((fpu_control_t));
+
+__END_DECLS
+
+#endif /* _M68K_FPU_CONTROL_H */