| /* FPU control word definitions. PowerPC version. |
| Copyright (C) 1996-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _FPU_CONTROL_H |
| #define _FPU_CONTROL_H |
| |
| #ifdef _SOFT_FLOAT |
| |
| # define _FPU_RESERVED 0xffffffff |
| # define _FPU_DEFAULT 0x00000000 /* Default value. */ |
| typedef unsigned int fpu_control_t; |
| # define _FPU_GETCW(cw) (cw) = 0 |
| # define _FPU_SETCW(cw) (void) (cw) |
| extern fpu_control_t __fpu_control; |
| |
| #elif defined __NO_FPRS__ /* e500 */ |
| |
| /* rounding control */ |
| # define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ |
| # define _FPU_RC_DOWN 0x03 |
| # define _FPU_RC_UP 0x02 |
| # define _FPU_RC_ZERO 0x01 |
| |
| /* masking of interrupts */ |
| # define _FPU_MASK_ZM 0x10 /* zero divide */ |
| # define _FPU_MASK_OM 0x04 /* overflow */ |
| # define _FPU_MASK_UM 0x08 /* underflow */ |
| # define _FPU_MASK_XM 0x40 /* inexact */ |
| # define _FPU_MASK_IM 0x20 /* invalid operation */ |
| |
| # define _FPU_RESERVED 0x00c10080 /* These bits are reserved and not changed. */ |
| |
| /* Correct IEEE semantics require traps to be enabled at the hardware |
| level; the kernel then does the emulation and determines whether |
| generation of signals from those traps was enabled using prctl. */ |
| # define _FPU_DEFAULT 0x0000003c /* Default value. */ |
| # define _FPU_IEEE _FPU_DEFAULT |
| |
| /* Type of the control word. */ |
| typedef unsigned int fpu_control_t; |
| |
| /* Macros for accessing the hardware control word. */ |
| # define _FPU_GETCW(cw) \ |
| __asm__ volatile ("mfspefscr %0" : "=r" (cw)) |
| # define _FPU_SETCW(cw) \ |
| __asm__ volatile ("mtspefscr %0" : : "r" (cw)) |
| |
| /* Default control word set at startup. */ |
| extern fpu_control_t __fpu_control; |
| |
| #else /* PowerPC 6xx floating-point. */ |
| |
| /* 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; |
| |
| /* Macros for accessing the hardware control word. */ |
| # define _FPU_GETCW(cw) \ |
| ({union { double __d; unsigned long long __ll; } __u; \ |
| register double __fr; \ |
| __asm__ ("mffs %0" : "=f" (__fr)); \ |
| __u.__d = __fr; \ |
| (cw) = (fpu_control_t) __u.__ll; \ |
| (fpu_control_t) __u.__ll; \ |
| }) |
| |
| # define _FPU_SETCW(cw) \ |
| { union { double __d; unsigned long long __ll; } __u; \ |
| register double __fr; \ |
| __u.__ll = 0xfff80000LL << 32; /* This is a QNaN. */ \ |
| __u.__ll |= (cw) & 0xffffffffLL; \ |
| __fr = __u.__d; \ |
| __asm__ ("mtfsf 255,%0" : : "f" (__fr)); \ |
| } |
| |
| /* Default control word set at startup. */ |
| extern fpu_control_t __fpu_control; |
| |
| #endif /* PowerPC 6xx floating-point. */ |
| |
| #endif /* _FPU_CONTROL_H */ |