From 8ceaf7c737b375d4d90afd8051d0b23aede22d96 Mon Sep 17 00:00:00 2001 From: Joakim Tjernlund Date: Sun, 4 Feb 2007 21:25:42 +0000 Subject: Add support for PowerPC e500, libc part only. Math support to be done. From Steve Papacharalambous, stevep@freescale.com --- libc/sysdeps/linux/powerpc/e500/fpu_control.h | 66 +++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 libc/sysdeps/linux/powerpc/e500/fpu_control.h (limited to 'libc/sysdeps/linux/powerpc/e500/fpu_control.h') diff --git a/libc/sysdeps/linux/powerpc/e500/fpu_control.h b/libc/sysdeps/linux/powerpc/e500/fpu_control.h new file mode 100644 index 000000000..10e8506ad --- /dev/null +++ b/libc/sysdeps/linux/powerpc/e500/fpu_control.h @@ -0,0 +1,66 @@ +/* FPU control word definitions. PowerPC e500 version. + Copyright (C) 1996, 1997, 1998, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Aldy Hernandez , 2004. + + 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 0xff3fff7f /* 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 0x000003c0 + +/* 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) ({ \ + unsigned int env; \ + asm volatile ("mfspefscr %0" : "=r" (env)); \ + (__cw) = env; }) +#define _FPU_SETCW(__cw) ({ \ + unsigned int env = __cw; \ + asm volatile ("mtspefscr %0" : : "r" (env)); }) + +#if 0 +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; +#endif + +#endif /* _FPU_CONTROL_H */ -- cgit v1.2.3