1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)npx.h 5.3 (Berkeley) 1/18/91 33 */ 34 35 /* 36 * Floating Point Data Structures and Constants 37 * W. Jolitz 1/90 38 */ 39 40 #ifndef _X86_FPU_H_ 41 #define _X86_FPU_H_ 42 43 /* Environment information of floating point unit. */ 44 struct env87 { 45 int32_t en_cw; /* control word (16bits) */ 46 int32_t en_sw; /* status word (16bits) */ 47 int32_t en_tw; /* tag word (16bits) */ 48 int32_t en_fip; /* fp instruction pointer */ 49 uint16_t en_fcs; /* fp code segment selector */ 50 uint16_t en_opcode; /* opcode last executed (11 bits) */ 51 int32_t en_foo; /* fp operand offset */ 52 int32_t en_fos; /* fp operand segment selector */ 53 }; 54 55 /* Contents of each x87 floating point accumulator. */ 56 struct fpacc87 { 57 uint8_t fp_bytes[10]; 58 }; 59 60 /* Floating point context. (i386 fnsave/frstor) */ 61 struct save87 { 62 struct env87 sv_env; /* floating point control/status */ 63 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */ 64 uint8_t sv_pad0[4]; /* saved status word (now unused) */ 65 uint8_t sv_pad[64]; 66 }; 67 68 /* Contents of each SSE extended accumulator. */ 69 struct xmmacc { 70 uint8_t xmm_bytes[16]; 71 }; 72 73 /* Contents of the upper 16 bytes of each AVX extended accumulator. */ 74 struct ymmacc { 75 uint8_t ymm_bytes[16]; 76 }; 77 78 /* Rename structs below depending on machine architecture. */ 79 #ifdef __i386__ 80 #define __envxmm32 envxmm 81 #else 82 #define __envxmm32 envxmm32 83 #define __envxmm64 envxmm 84 #endif 85 86 struct __envxmm32 { 87 uint16_t en_cw; /* control word (16bits) */ 88 uint16_t en_sw; /* status word (16bits) */ 89 uint16_t en_tw; /* tag word (16bits) */ 90 uint16_t en_opcode; /* opcode last executed (11 bits) */ 91 uint32_t en_fip; /* fp instruction pointer */ 92 uint16_t en_fcs; /* fp code segment selector */ 93 uint16_t en_pad0; /* padding */ 94 uint32_t en_foo; /* fp operand offset */ 95 uint16_t en_fos; /* fp operand segment selector */ 96 uint16_t en_pad1; /* padding */ 97 uint32_t en_mxcsr; /* SSE control/status register */ 98 uint32_t en_mxcsr_mask; /* valid bits in mxcsr */ 99 }; 100 101 struct __envxmm64 { 102 uint16_t en_cw; /* control word (16bits) */ 103 uint16_t en_sw; /* status word (16bits) */ 104 uint8_t en_tw; /* tag word (8bits) */ 105 uint8_t en_zero; 106 uint16_t en_opcode; /* opcode last executed (11 bits ) */ 107 uint64_t en_rip; /* fp instruction pointer */ 108 uint64_t en_rdp; /* fp operand pointer */ 109 uint32_t en_mxcsr; /* SSE control/status register */ 110 uint32_t en_mxcsr_mask; /* valid bits in mxcsr */ 111 }; 112 113 /* Floating point context. (i386 fxsave/fxrstor) */ 114 struct savexmm { 115 struct __envxmm32 sv_env; 116 struct { 117 struct fpacc87 fp_acc; 118 uint8_t fp_pad[6]; /* padding */ 119 } sv_fp[8]; 120 struct xmmacc sv_xmm[8]; 121 uint8_t sv_pad[224]; 122 } __aligned(16); 123 124 #ifdef __i386__ 125 union savefpu { 126 struct save87 sv_87; 127 struct savexmm sv_xmm; 128 }; 129 #else 130 /* Floating point context. (amd64 fxsave/fxrstor) */ 131 struct savefpu { 132 struct __envxmm64 sv_env; 133 struct { 134 struct fpacc87 fp_acc; 135 uint8_t fp_pad[6]; /* padding */ 136 } sv_fp[8]; 137 struct xmmacc sv_xmm[16]; 138 uint8_t sv_pad[96]; 139 } __aligned(16); 140 #endif 141 142 struct xstate_hdr { 143 uint64_t xstate_bv; 144 uint64_t xstate_xcomp_bv; 145 uint8_t xstate_rsrv0[8]; 146 uint8_t xstate_rsrv[40]; 147 }; 148 #define XSTATE_XCOMP_BV_COMPACT (1ULL << 63) 149 150 struct savexmm_xstate { 151 struct xstate_hdr sx_hd; 152 struct ymmacc sx_ymm[16]; 153 }; 154 155 struct savexmm_ymm { 156 struct __envxmm32 sv_env; 157 struct { 158 struct fpacc87 fp_acc; 159 int8_t fp_pad[6]; /* padding */ 160 } sv_fp[8]; 161 struct xmmacc sv_xmm[16]; 162 uint8_t sv_pad[96]; 163 struct savexmm_xstate sv_xstate; 164 } __aligned(64); 165 166 struct savefpu_xstate { 167 struct xstate_hdr sx_hd; 168 struct ymmacc sx_ymm[16]; 169 }; 170 171 struct savefpu_ymm { 172 struct __envxmm64 sv_env; 173 struct { 174 struct fpacc87 fp_acc; 175 int8_t fp_pad[6]; /* padding */ 176 } sv_fp[8]; 177 struct xmmacc sv_xmm[16]; 178 uint8_t sv_pad[96]; 179 struct savefpu_xstate sv_xstate; 180 } __aligned(64); 181 182 #undef __envxmm32 183 #undef __envxmm64 184 185 /* 186 * The hardware default control word for i387's and later coprocessors is 187 * 0x37F, giving: 188 * 189 * round to nearest 190 * 64-bit precision 191 * all exceptions masked. 192 * 193 * FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc 194 * because of the difference between memory and fpu register stack arguments. 195 * If its using an intermediate fpu register, it has 80/64 bits to work 196 * with. If it uses memory, it has 64/53 bits to work with. However, 197 * gcc is aware of this and goes to a fair bit of trouble to make the 198 * best use of it. 199 * 200 * This is mostly academic for AMD64, because the ABI prefers the use 201 * SSE2 based math. For FreeBSD/amd64, we go with the default settings. 202 */ 203 #define __INITIAL_FPUCW__ 0x037F 204 #define __INITIAL_FPUCW_I386__ 0x127F 205 #define __INITIAL_NPXCW__ __INITIAL_FPUCW_I386__ 206 #define __INITIAL_MXCSR__ 0x1F80 207 #define __INITIAL_MXCSR_MASK__ 0xFFBF 208 209 /* 210 * The current value of %xcr0 is saved in the sv_pad[] field of the FPU 211 * state in the NT_X86_XSTATE note in core dumps. This offset is chosen 212 * to match the offset used by NT_X86_XSTATE in other systems. 213 */ 214 #define X86_XSTATE_XCR0_OFFSET 464 215 216 #endif /* !_X86_FPU_H_ */ 217