headers/posix/arch/x86_64/fpu.h

   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  * 4. 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  * $FreeBSD$
  34  */
  35
  36 /*
  37  * Floating Point Data Structures and Constants
  38  * W. Jolitz 1/90
  39  */
  40
  41 #ifndef _X86_FPU_H_
  42 #define _X86_FPU_H_
  43
  44 #define __aligned(x)    __attribute__((__aligned__(x)))
  45
  46 /* Environment information of floating point unit. */
  47 struct env87 {
  48         int32_t         en_cw;          /* control word (16bits) */
  49         int32_t         en_sw;          /* status word (16bits) */
  50         int32_t         en_tw;          /* tag word (16bits) */
  51         int32_t         en_fip;         /* fp instruction pointer */
  52         uint16_t        en_fcs;         /* fp code segment selector */
  53         uint16_t        en_opcode;      /* opcode last executed (11 bits) */
  54         int32_t         en_foo;         /* fp operand offset */
  55         int32_t         en_fos;         /* fp operand segment selector */
  56 };
  57
  58 /* Contents of each x87 floating point accumulator. */
  59 struct fpacc87 {
  60         uint8_t         fp_bytes[10];
  61 };
  62
  63 /* Floating point context. (i386 fnsave/frstor) */
  64 struct save87 {
  65         struct env87    sv_env;         /* floating point control/status */
  66         struct fpacc87  sv_ac[8];       /* accumulator contents, 0-7 */
  67         uint8_t         sv_pad0[4];     /* saved status word (now unused) */
  68         /*
  69          * Bogus padding for emulators.  Emulators should use their own
  70          * struct and arrange to store into this struct (ending here)
  71          * before it is inspected for ptracing or for core dumps.  Some
  72          * emulators overwrite the whole struct.  We have no good way of
  73          * knowing how much padding to leave.  Leave just enough for the
  74          * GPL emulator's i387_union (176 bytes total).
  75          */
  76         uint8_t         sv_pad[64];     /* padding; used by emulators */
  77 };
  78
  79 /* Contents of each SSE extended accumulator. */
  80 struct xmmacc {
  81         uint8_t         xmm_bytes[16];
  82 };
  83
  84 /* Contents of the upper 16 bytes of each AVX extended accumulator. */
  85 struct ymmacc {
  86         uint8_t         ymm_bytes[16];
  87 };
  88
  89 /* Rename structs below depending on machine architecture. */
  90 #ifdef __i386__
  91 #define __envxmm32      envxmm
  92 #else
  93 #define __envxmm32      envxmm32
  94 #define __envxmm64      envxmm
  95 #endif
  96
  97 struct __envxmm32 {
  98         uint16_t        en_cw;          /* control word (16bits) */
  99         uint16_t        en_sw;          /* status word (16bits) */
 100         uint16_t        en_tw;          /* tag word (16bits) */
 101         uint16_t        en_opcode;      /* opcode last executed (11 bits) */
 102         uint32_t        en_fip;         /* fp instruction pointer */
 103         uint16_t        en_fcs;         /* fp code segment selector */
 104         uint16_t        en_pad0;        /* padding */
 105         uint32_t        en_foo;         /* fp operand offset */
 106         uint16_t        en_fos;         /* fp operand segment selector */
 107         uint16_t        en_pad1;        /* padding */
 108         uint32_t        en_mxcsr;       /* SSE control/status register */
 109         uint32_t        en_mxcsr_mask;  /* valid bits in mxcsr */
 110 };
 111
 112 struct __envxmm64 {
 113         uint16_t        en_cw;          /* control word (16bits) */
 114         uint16_t        en_sw;          /* status word (16bits) */
 115         uint8_t         en_tw;          /* tag word (8bits) */
 116         uint8_t         en_zero;
 117         uint16_t        en_opcode;      /* opcode last executed (11 bits ) */
 118         uint64_t        en_rip;         /* fp instruction pointer */
 119         uint64_t        en_rdp;         /* fp operand pointer */
 120         uint32_t        en_mxcsr;       /* SSE control/status register */
 121         uint32_t        en_mxcsr_mask;  /* valid bits in mxcsr */
 122 };
 123
 124 /* Floating point context. (i386 fxsave/fxrstor) */
 125 struct savexmm {
 126         struct __envxmm32       sv_env;
 127         struct {
 128                 struct fpacc87  fp_acc;
 129                 uint8_t         fp_pad[6];      /* padding */
 130         } sv_fp[8];
 131         struct xmmacc           sv_xmm[8];
 132         uint8_t                 sv_pad[224];
 133 } __aligned(16);
 134
 135 #ifdef __i386__
 136 union savefpu {
 137         struct save87   sv_87;
 138         struct savexmm  sv_xmm;
 139 };
 140 #else
 141 /* Floating point context. (amd64 fxsave/fxrstor) */
 142 struct savefpu {
 143         struct __envxmm64       sv_env;
 144         struct {
 145                 struct fpacc87  fp_acc;
 146                 uint8_t         fp_pad[6];      /* padding */
 147         } sv_fp[8];
 148         struct xmmacc           sv_xmm[16];
 149         uint8_t                 sv_pad[96];
 150 } __aligned(16);
 151 #endif
 152
 153 struct xstate_hdr {
 154         uint64_t        xstate_bv;
 155         uint8_t         xstate_rsrv0[16];
 156         uint8_t         xstate_rsrv[40];
 157 };
 158
 159 struct savexmm_xstate {
 160         struct xstate_hdr       sx_hd;
 161         struct ymmacc           sx_ymm[16];
 162 };
 163
 164 struct savexmm_ymm {
 165         struct __envxmm32       sv_env;
 166         struct {
 167                 struct fpacc87  fp_acc;
 168                 int8_t          fp_pad[6];      /* padding */
 169         } sv_fp[8];
 170         struct xmmacc           sv_xmm[16];
 171         uint8_t                 sv_pad[96];
 172         struct savexmm_xstate   sv_xstate;
 173 } __aligned(64);
 174
 175 struct savefpu_xstate {
 176         struct xstate_hdr       sx_hd;
 177         struct ymmacc           sx_ymm[16];
 178 };
 179
 180 struct savefpu_ymm {
 181         struct __envxmm64       sv_env;
 182         struct {
 183                 struct fpacc87  fp_acc;
 184                 int8_t          fp_pad[6];      /* padding */
 185         } sv_fp[8];
 186         struct xmmacc           sv_xmm[16];
 187         uint8_t                 sv_pad[96];
 188         struct savefpu_xstate   sv_xstate;
 189 } __aligned(64);
 190
 191 #undef __envxmm32
 192 #undef __envxmm64
 193
 194 /*
 195  * The hardware default control word for i387's and later coprocessors is
 196  * 0x37F, giving:
 197  *
 198  *      round to nearest
 199  *      64-bit precision
 200  *      all exceptions masked.
 201  *
 202  * FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc
 203  * because of the difference between memory and fpu register stack arguments.
 204  * If its using an intermediate fpu register, it has 80/64 bits to work
 205  * with.  If it uses memory, it has 64/53 bits to work with.  However,
 206  * gcc is aware of this and goes to a fair bit of trouble to make the
 207  * best use of it.
 208  *
 209  * This is mostly academic for AMD64, because the ABI prefers the use
 210  * SSE2 based math.  For FreeBSD/amd64, we go with the default settings.
 211  */
 212 #define __INITIAL_FPUCW__       0x037F
 213 #define __INITIAL_FPUCW_I386__  0x127F
 214 #define __INITIAL_NPXCW__       __INITIAL_FPUCW_I386__
 215 #define __INITIAL_MXCSR__       0x1F80
 216 #define __INITIAL_MXCSR_MASK__  0xFFBF
 217
 218 #endif /* !_X86_FPU_H_ */