diff options
Diffstat (limited to 'libc/sysdeps/linux/m68k')
| -rw-r--r-- | libc/sysdeps/linux/m68k/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/m68k/fpu_control.h | 69 |
2 files changed, 70 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/m68k/Makefile b/libc/sysdeps/linux/m68k/Makefile index a98352198..7369bc925 100644 --- a/libc/sysdeps/linux/m68k/Makefile +++ b/libc/sysdeps/linux/m68k/Makefile @@ -65,6 +65,7 @@ ifneq ($(strip $(HAVE_ELF)),y) echo "Working around compiler bug in the m68k-pic-coff toolchain" cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/m68k/float.h . endif + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/m68k/fpu_control.h . clean: diff --git a/libc/sysdeps/linux/m68k/fpu_control.h b/libc/sysdeps/linux/m68k/fpu_control.h new file mode 100644 index 000000000..1b2ba87c9 --- /dev/null +++ b/libc/sysdeps/linux/m68k/fpu_control.h @@ -0,0 +1,69 @@ +/* FPU control word definitions. PowerPC version. + Copyright (C) 1996, 1997, 1998 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 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. */ + +#ifndef _FPU_CONTROL_H +#define _FPU_CONTROL_H + +/* rounding control */ +#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ +#define _FPU_RC_DOWN 0x03 +#define _FPU_RC_UP 0x02 +#define _FPU_RC_ZERO 0x01 + +#define _FPU_MASK_NI 0x04 /* non-ieee mode */ + +/* masking of interrupts */ +#define _FPU_MASK_ZM 0x10 /* zero divide */ +#define _FPU_MASK_OM 0x40 /* overflow */ +#define _FPU_MASK_UM 0x20 /* underflow */ +#define _FPU_MASK_XM 0x08 /* inexact */ +#define _FPU_MASK_IM 0x80 /* invalid operation */ + +#define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */ + +/* The fdlibm code requires no interrupts for exceptions. */ +#define _FPU_DEFAULT 0x00000000 /* Default value. */ + +/* IEEE: same as above, but (some) exceptions; + we leave the 'inexact' exception off. + */ +#define _FPU_IEEE 0x000000f0 + +/* 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) ( { \ + union { double d; fpu_control_t cw[2]; } \ + tmp __attribute__ ((__aligned__(8))); \ + __asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \ + (__cw)=tmp.cw[1]; \ + tmp.cw[1]; } ) +#define _FPU_SETCW(__cw) { \ + union { double d; fpu_control_t cw[2]; } \ + tmp __attribute__ ((__aligned__(8))); \ + tmp.cw[0] = 0xFFF80000; /* More-or-less arbitrary; this is a QNaN. */ \ + tmp.cw[1] = __cw; \ + __asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (tmp.d) : "fr0"); \ +} + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* _FPU_CONTROL_H */ |