From 5fbef188648f5150617e0a14f1011e600f1b3a0f Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sun, 16 Jun 1996 03:49:40 +0000 Subject: * 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. --- sysdeps/m68k/fpu_control.h | 108 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 sysdeps/m68k/fpu_control.h (limited to 'sysdeps/m68k') 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 + +/* 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 */ -- cgit v1.2.3