FreeBSD/Linux Kernel Cross Reference
sys/x86/include/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: releng/10.0/sys/x86/include/fpu.h 233044 2012-03-16 20:24:30Z tijl $
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 /* Environment information of floating point unit. */
45 struct env87 {
46 int32_t en_cw; /* control word (16bits) */
47 int32_t en_sw; /* status word (16bits) */
48 int32_t en_tw; /* tag word (16bits) */
49 int32_t en_fip; /* fp instruction pointer */
50 uint16_t en_fcs; /* fp code segment selector */
51 uint16_t en_opcode; /* opcode last executed (11 bits) */
52 int32_t en_foo; /* fp operand offset */
53 int32_t en_fos; /* fp operand segment selector */
54 };
55
56 /* Contents of each x87 floating point accumulator. */
57 struct fpacc87 {
58 uint8_t fp_bytes[10];
59 };
60
61 /* Floating point context. (i386 fnsave/frstor) */
62 struct save87 {
63 struct env87 sv_env; /* floating point control/status */
64 struct fpacc87 sv_ac[8]; /* accumulator contents, 0-7 */
65 uint8_t sv_pad0[4]; /* saved status word (now unused) */
66 /*
67 * Bogus padding for emulators. Emulators should use their own
68 * struct and arrange to store into this struct (ending here)
69 * before it is inspected for ptracing or for core dumps. Some
70 * emulators overwrite the whole struct. We have no good way of
71 * knowing how much padding to leave. Leave just enough for the
72 * GPL emulator's i387_union (176 bytes total).
73 */
74 uint8_t sv_pad[64]; /* padding; used by emulators */
75 };
76
77 /* Contents of each SSE extended accumulator. */
78 struct xmmacc {
79 uint8_t xmm_bytes[16];
80 };
81
82 /* Contents of the upper 16 bytes of each AVX extended accumulator. */
83 struct ymmacc {
84 uint8_t ymm_bytes[16];
85 };
86
87 /* Rename structs below depending on machine architecture. */
88 #ifdef __i386__
89 #define __envxmm32 envxmm
90 #else
91 #define __envxmm32 envxmm32
92 #define __envxmm64 envxmm
93 #endif
94
95 struct __envxmm32 {
96 uint16_t en_cw; /* control word (16bits) */
97 uint16_t en_sw; /* status word (16bits) */
98 uint16_t en_tw; /* tag word (16bits) */
99 uint16_t en_opcode; /* opcode last executed (11 bits) */
100 uint32_t en_fip; /* fp instruction pointer */
101 uint16_t en_fcs; /* fp code segment selector */
102 uint16_t en_pad0; /* padding */
103 uint32_t en_foo; /* fp operand offset */
104 uint16_t en_fos; /* fp operand segment selector */
105 uint16_t en_pad1; /* padding */
106 uint32_t en_mxcsr; /* SSE control/status register */
107 uint32_t en_mxcsr_mask; /* valid bits in mxcsr */
108 };
109
110 struct __envxmm64 {
111 uint16_t en_cw; /* control word (16bits) */
112 uint16_t en_sw; /* status word (16bits) */
113 uint8_t en_tw; /* tag word (8bits) */
114 uint8_t en_zero;
115 uint16_t en_opcode; /* opcode last executed (11 bits ) */
116 uint64_t en_rip; /* fp instruction pointer */
117 uint64_t en_rdp; /* fp operand pointer */
118 uint32_t en_mxcsr; /* SSE control/status register */
119 uint32_t en_mxcsr_mask; /* valid bits in mxcsr */
120 };
121
122 /* Floating point context. (i386 fxsave/fxrstor) */
123 struct savexmm {
124 struct __envxmm32 sv_env;
125 struct {
126 struct fpacc87 fp_acc;
127 uint8_t fp_pad[6]; /* padding */
128 } sv_fp[8];
129 struct xmmacc sv_xmm[8];
130 uint8_t sv_pad[224];
131 } __aligned(16);
132
133 #ifdef __i386__
134 union savefpu {
135 struct save87 sv_87;
136 struct savexmm sv_xmm;
137 };
138 #else
139 /* Floating point context. (amd64 fxsave/fxrstor) */
140 struct savefpu {
141 struct __envxmm64 sv_env;
142 struct {
143 struct fpacc87 fp_acc;
144 uint8_t fp_pad[6]; /* padding */
145 } sv_fp[8];
146 struct xmmacc sv_xmm[16];
147 uint8_t sv_pad[96];
148 } __aligned(16);
149 #endif
150
151 struct xstate_hdr {
152 uint64_t xstate_bv;
153 uint8_t xstate_rsrv0[16];
154 uint8_t xstate_rsrv[40];
155 };
156
157 struct savexmm_xstate {
158 struct xstate_hdr sx_hd;
159 struct ymmacc sx_ymm[16];
160 };
161
162 struct savexmm_ymm {
163 struct __envxmm32 sv_env;
164 struct {
165 struct fpacc87 fp_acc;
166 int8_t fp_pad[6]; /* padding */
167 } sv_fp[8];
168 struct xmmacc sv_xmm[16];
169 uint8_t sv_pad[96];
170 struct savexmm_xstate sv_xstate;
171 } __aligned(64);
172
173 struct savefpu_xstate {
174 struct xstate_hdr sx_hd;
175 struct ymmacc sx_ymm[16];
176 };
177
178 struct savefpu_ymm {
179 struct __envxmm64 sv_env;
180 struct {
181 struct fpacc87 fp_acc;
182 int8_t fp_pad[6]; /* padding */
183 } sv_fp[8];
184 struct xmmacc sv_xmm[16];
185 uint8_t sv_pad[96];
186 struct savefpu_xstate sv_xstate;
187 } __aligned(64);
188
189 #undef __envxmm32
190 #undef __envxmm64
191
192 /*
193 * The hardware default control word for i387's and later coprocessors is
194 * 0x37F, giving:
195 *
196 * round to nearest
197 * 64-bit precision
198 * all exceptions masked.
199 *
200 * FreeBSD/i386 uses 53 bit precision for things like fadd/fsub/fsqrt etc
201 * because of the difference between memory and fpu register stack arguments.
202 * If its using an intermediate fpu register, it has 80/64 bits to work
203 * with. If it uses memory, it has 64/53 bits to work with. However,
204 * gcc is aware of this and goes to a fair bit of trouble to make the
205 * best use of it.
206 *
207 * This is mostly academic for AMD64, because the ABI prefers the use
208 * SSE2 based math. For FreeBSD/amd64, we go with the default settings.
209 */
210 #define __INITIAL_FPUCW__ 0x037F
211 #define __INITIAL_FPUCW_I386__ 0x127F
212 #define __INITIAL_NPXCW__ __INITIAL_FPUCW_I386__
213 #define __INITIAL_MXCSR__ 0x1F80
214 #define __INITIAL_MXCSR_MASK__ 0xFFBF
215
216 #endif /* !_X86_FPU_H_ */
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