219 lines
6.7 KiB
C
219 lines
6.7 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)npx.h 5.3 (Berkeley) 1/18/91
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* $FreeBSD$
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*/
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/*
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* Floating Point Data Structures and Constants
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* W. Jolitz 1/90
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*/
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#ifndef _X86_FPU_H_
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#define _X86_FPU_H_
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#define __aligned(x) __attribute__((__aligned__(x)))
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/* Environment information of floating point unit. */
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struct env87 {
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int32_t en_cw; /* control word (16bits) */
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int32_t en_sw; /* status word (16bits) */
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int32_t en_tw; /* tag word (16bits) */
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int32_t en_fip; /* fp instruction pointer */
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uint16_t en_fcs; /* fp code segment selector */
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uint16_t en_opcode; /* opcode last executed (11 bits) */
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int32_t en_foo; /* fp operand offset */
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int32_t en_fos; /* fp operand segment selector */
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};
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/* Contents of each x87 floating point accumulator. */
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struct fpacc87 {
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uint8_t fp_bytes[10];
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};
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/* Floating point context. (i386 fnsave/frstor) */
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struct save87 {
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struct env87 sv_env; /* floating point control/status */
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struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
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uint8_t sv_pad0[4]; /* saved status word (now unused) */
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/*
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* Bogus padding for emulators. Emulators should use their own
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* struct and arrange to store into this struct (ending here)
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* before it is inspected for ptracing or for core dumps. Some
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* emulators overwrite the whole struct. We have no good way of
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* knowing how much padding to leave. Leave just enough for the
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* GPL emulator's i387_union (176 bytes total).
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*/
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uint8_t sv_pad[64]; /* padding; used by emulators */
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};
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/* Contents of each SSE extended accumulator. */
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struct xmmacc {
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uint8_t xmm_bytes[16];
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};
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/* Contents of the upper 16 bytes of each AVX extended accumulator. */
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struct ymmacc {
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uint8_t ymm_bytes[16];
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};
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/* Rename structs below depending on machine architecture. */
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#ifdef __i386__
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#define __envxmm32 envxmm
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#else
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#define __envxmm32 envxmm32
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#define __envxmm64 envxmm
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#endif
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struct __envxmm32 {
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uint16_t en_cw; /* control word (16bits) */
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uint16_t en_sw; /* status word (16bits) */
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uint16_t en_tw; /* tag word (16bits) */
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uint16_t en_opcode; /* opcode last executed (11 bits) */
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uint32_t en_fip; /* fp instruction pointer */
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uint16_t en_fcs; /* fp code segment selector */
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uint16_t en_pad0; /* padding */
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uint32_t en_foo; /* fp operand offset */
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uint16_t en_fos; /* fp operand segment selector */
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uint16_t en_pad1; /* padding */
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uint32_t en_mxcsr; /* SSE control/status register */
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uint32_t en_mxcsr_mask; /* valid bits in mxcsr */
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};
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struct __envxmm64 {
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uint16_t en_cw; /* control word (16bits) */
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uint16_t en_sw; /* status word (16bits) */
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uint8_t en_tw; /* tag word (8bits) */
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uint8_t en_zero;
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uint16_t en_opcode; /* opcode last executed (11 bits ) */
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uint64_t en_rip; /* fp instruction pointer */
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uint64_t en_rdp; /* fp operand pointer */
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uint32_t en_mxcsr; /* SSE control/status register */
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uint32_t en_mxcsr_mask; /* valid bits in mxcsr */
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};
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/* Floating point context. (i386 fxsave/fxrstor) */
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struct savexmm {
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struct __envxmm32 sv_env;
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struct {
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struct fpacc87 fp_acc;
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uint8_t fp_pad[6]; /* padding */
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} sv_fp[8];
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struct xmmacc sv_xmm[8];
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uint8_t sv_pad[224];
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} __aligned(16);
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#ifdef __i386__
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union savefpu {
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struct save87 sv_87;
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struct savexmm sv_xmm;
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};
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#else
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/* Floating point context. (amd64 fxsave/fxrstor) */
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struct savefpu {
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struct __envxmm64 sv_env;
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struct {
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struct fpacc87 fp_acc;
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uint8_t fp_pad[6]; /* padding */
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} sv_fp[8];
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struct xmmacc sv_xmm[16];
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uint8_t sv_pad[96];
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} __aligned(16);
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#endif
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struct xstate_hdr {
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uint64_t xstate_bv;
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uint8_t xstate_rsrv0[16];
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uint8_t xstate_rsrv[40];
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};
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struct savexmm_xstate {
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struct xstate_hdr sx_hd;
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struct ymmacc sx_ymm[16];
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};
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struct savexmm_ymm {
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struct __envxmm32 sv_env;
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struct {
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struct fpacc87 fp_acc;
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int8_t fp_pad[6]; /* padding */
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} sv_fp[8];
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struct xmmacc sv_xmm[16];
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uint8_t sv_pad[96];
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struct savexmm_xstate sv_xstate;
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} __aligned(64);
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struct savefpu_xstate {
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struct xstate_hdr sx_hd;
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struct ymmacc sx_ymm[16];
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};
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struct savefpu_ymm {
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struct __envxmm64 sv_env;
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struct {
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struct fpacc87 fp_acc;
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int8_t fp_pad[6]; /* padding */
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} sv_fp[8];
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struct xmmacc sv_xmm[16];
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uint8_t sv_pad[96];
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struct savefpu_xstate sv_xstate;
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} __aligned(64);
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#undef __envxmm32
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#undef __envxmm64
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/*
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* The hardware default control word for i387's and later coprocessors is
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* 0x37F, giving:
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*
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* round to nearest
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* 64-bit precision
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* all exceptions masked.
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*
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* FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc
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* because of the difference between memory and fpu register stack arguments.
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* If its using an intermediate fpu register, it has 80/64 bits to work
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* with. If it uses memory, it has 64/53 bits to work with. However,
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* gcc is aware of this and goes to a fair bit of trouble to make the
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* best use of it.
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*
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* This is mostly academic for AMD64, because the ABI prefers the use
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* SSE2 based math. For FreeBSD/amd64, we go with the default settings.
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*/
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#define __INITIAL_FPUCW__ 0x037F
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#define __INITIAL_FPUCW_I386__ 0x127F
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#define __INITIAL_NPXCW__ __INITIAL_FPUCW_I386__
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#define __INITIAL_MXCSR__ 0x1F80
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#define __INITIAL_MXCSR_MASK__ 0xFFBF
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#endif /* !_X86_FPU_H_ */
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