/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)npx.h 5.3 (Berkeley) 1/18/91
* $FreeBSD$
*/
/*
* Floating Point Data Structures and Constants
* W. Jolitz 1/90
*/
#ifndef _X86_FPU_H_
#define _X86_FPU_H_
/* Environment information of floating point unit. */
struct env87 {
int32_t en_cw; /* control word (16bits) */
int32_t en_sw; /* status word (16bits) */
int32_t en_tw; /* tag word (16bits) */
int32_t en_fip; /* fp instruction pointer */
uint16_t en_fcs; /* fp code segment selector */
uint16_t en_opcode; /* opcode last executed (11 bits) */
int32_t en_foo; /* fp operand offset */
int32_t en_fos; /* fp operand segment selector */
};
/* Contents of each x87 floating point accumulator. */
struct fpacc87 {
uint8_t fp_bytes[10];
};
/* Floating point context. (i386 fnsave/frstor) */
struct save87 {
struct env87 sv_env; /* floating point control/status */
struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
uint8_t sv_pad0[4]; /* saved status word (now unused) */
uint8_t sv_pad[64];
};
/* Contents of each SSE extended accumulator. */
struct xmmacc {
uint8_t xmm_bytes[16];
};
/* Contents of the upper 16 bytes of each AVX extended accumulator. */
struct ymmacc {
uint8_t ymm_bytes[16];
};
/* Rename structs below depending on machine architecture. */
#ifdef __i386__
#define __envxmm32 envxmm
#else
#define __envxmm32 envxmm32
#define __envxmm64 envxmm
#endif
struct __envxmm32 {
uint16_t en_cw; /* control word (16bits) */
uint16_t en_sw; /* status word (16bits) */
uint16_t en_tw; /* tag word (16bits) */
uint16_t en_opcode; /* opcode last executed (11 bits) */
uint32_t en_fip; /* fp instruction pointer */
uint16_t en_fcs; /* fp code segment selector */
uint16_t en_pad0; /* padding */
uint32_t en_foo; /* fp operand offset */
uint16_t en_fos; /* fp operand segment selector */
uint16_t en_pad1; /* padding */
uint32_t en_mxcsr; /* SSE control/status register */
uint32_t en_mxcsr_mask; /* valid bits in mxcsr */
};
struct __envxmm64 {
uint16_t en_cw; /* control word (16bits) */
uint16_t en_sw; /* status word (16bits) */
uint8_t en_tw; /* tag word (8bits) */
uint8_t en_zero;
uint16_t en_opcode; /* opcode last executed (11 bits ) */
uint64_t en_rip; /* fp instruction pointer */
uint64_t en_rdp; /* fp operand pointer */
uint32_t en_mxcsr; /* SSE control/status register */
uint32_t en_mxcsr_mask; /* valid bits in mxcsr */
};
/* Floating point context. (i386 fxsave/fxrstor) */
struct savexmm {
struct __envxmm32 sv_env;
struct {
struct fpacc87 fp_acc;
uint8_t fp_pad[6]; /* padding */
} sv_fp[8];
struct xmmacc sv_xmm[8];
uint8_t sv_pad[224];
} __aligned(16);
#ifdef __i386__
union savefpu {
struct save87 sv_87;
struct savexmm sv_xmm;
};
#else
/* Floating point context. (amd64 fxsave/fxrstor) */
struct savefpu {
struct __envxmm64 sv_env;
struct {
struct fpacc87 fp_acc;
uint8_t fp_pad[6]; /* padding */
} sv_fp[8];
struct xmmacc sv_xmm[16];
uint8_t sv_pad[96];
} __aligned(16);
#endif
struct xstate_hdr {
uint64_t xstate_bv;
uint64_t xstate_xcomp_bv;
uint8_t xstate_rsrv0[8];
uint8_t xstate_rsrv[40];
};
#define XSTATE_XCOMP_BV_COMPACT (1ULL << 63)
struct savexmm_xstate {
struct xstate_hdr sx_hd;
struct ymmacc sx_ymm[16];
};
struct savexmm_ymm {
struct __envxmm32 sv_env;
struct {
struct fpacc87 fp_acc;
int8_t fp_pad[6]; /* padding */
} sv_fp[8];
struct xmmacc sv_xmm[16];
uint8_t sv_pad[96];
struct savexmm_xstate sv_xstate;
} __aligned(64);
struct savefpu_xstate {
struct xstate_hdr sx_hd;
struct ymmacc sx_ymm[16];
};
struct savefpu_ymm {
struct __envxmm64 sv_env;
struct {
struct fpacc87 fp_acc;
int8_t fp_pad[6]; /* padding */
} sv_fp[8];
struct xmmacc sv_xmm[16];
uint8_t sv_pad[96];
struct savefpu_xstate sv_xstate;
} __aligned(64);
#undef __envxmm32
#undef __envxmm64
/*
* The hardware default control word for i387's and later coprocessors is
* 0x37F, giving:
*
* round to nearest
* 64-bit precision
* all exceptions masked.
*
* FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc
* because of the difference between memory and fpu register stack arguments.
* If its using an intermediate fpu register, it has 80/64 bits to work
* with. If it uses memory, it has 64/53 bits to work with. However,
* gcc is aware of this and goes to a fair bit of trouble to make the
* best use of it.
*
* This is mostly academic for AMD64, because the ABI prefers the use
* SSE2 based math. For FreeBSD/amd64, we go with the default settings.
*/
#define __INITIAL_FPUCW__ 0x037F
#define __INITIAL_FPUCW_I386__ 0x127F
#define __INITIAL_NPXCW__ __INITIAL_FPUCW_I386__
#define __INITIAL_MXCSR__ 0x1F80
#define __INITIAL_MXCSR_MASK__ 0xFFBF
/*
* The current value of %xcr0 is saved in the sv_pad[] field of the FPU
* state in the NT_X86_XSTATE note in core dumps. This offset is chosen
* to match the offset used by NT_X86_XSTATE in other systems.
*/
#define X86_XSTATE_XCR0_OFFSET 464
#endif /* !_X86_FPU_H_ */