1 /* FPU control word definitions. HP-PARISC version. 2 Copyright (C) 2012-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _FPU_CONTROL_H 20 #define _FPU_CONTROL_H 21 22 /* Masking of interrupts. */ 23 #define _FPU_MASK_PM 0x00000001 /* Inexact (I) */ 24 #define _FPU_MASK_UM 0x00000002 /* Underflow (U) */ 25 #define _FPU_MASK_OM 0x00000004 /* Overflow (O) */ 26 #define _FPU_MASK_ZM 0x00000008 /* Divide by zero (Z) */ 27 #define _FPU_MASK_IM 0x00000010 /* Invalid operation (V) */ 28 29 /* Masking of rounding modes. */ 30 #define _FPU_HPPA_MASK_RM 0x00000600 /* Rounding mode mask */ 31 /* Masking of interrupt enable bits. */ 32 #define _FPU_HPPA_MASK_INT 0x0000001f /* Interrupt mask */ 33 /* Shift by 27 to install flag bits. */ 34 #define _FPU_HPPA_SHIFT_FLAGS 27 35 36 /* There are no reserved bits in the PA fpsr (though some are undefined). */ 37 #define _FPU_RESERVED 0x00000000 38 /* Default is: No traps enabled, no flags set, round to nearest. */ 39 #define _FPU_DEFAULT 0x00000000 40 /* Default + exceptions (FE_ALL_EXCEPT) enabled. */ 41 #define _FPU_IEEE (_FPU_DEFAULT | _FPU_HPPA_MASK_INT) 42 43 /* Type of the control word. */ 44 typedef unsigned int fpu_control_t; 45 46 /* Macros for accessing the hardware control word. */ 47 #define _FPU_GETCW(cw) \ 48 ({ \ 49 union { __extension__ unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp; \ 50 /* Get the current status word. */ \ 51 __asm__ ("fstd %%fr0,0(%1)\n\t" \ 52 "fldd 0(%1),%%fr0\n\t" \ 53 : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0"); \ 54 cw = __fullfp.__halfreg[0]; \ 55 }) 56 57 #define _FPU_SETCW(cw) \ 58 ({ \ 59 union { __extension__ unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp; \ 60 /* Get the current status word and set the control word. */ \ 61 __asm__ ("fstd %%fr0,0(%1)\n\t" \ 62 : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0"); \ 63 __fullfp.__halfreg[0] = cw; \ 64 __asm__ ("fldd 0(%1),%%fr0\n\t" \ 65 : : "m" (__fullfp.__fpreg), "r" (&__fullfp.__fpreg) : "%r0" ); \ 66 }) 67 68 /* Default control word set at startup. */ 69 extern fpu_control_t __fpu_control; 70 71 #endif /* _FPU_CONTROL_H */ 72