1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
#ifndef _ASM_X86_SIGCONTEXT_H
#define _ASM_X86_SIGCONTEXT_H
#include <linux/compiler.h>
#include <asm/types.h>
#define FP_XSTATE_MAGIC1 0x46505853U
#define FP_XSTATE_MAGIC2 0x46505845U
#define FP_XSTATE_MAGIC2_SIZE sizeof(FP_XSTATE_MAGIC2)
/*
* bytes 464..511 in the current 512byte layout of fxsave/fxrstor frame
* are reserved for SW usage. On cpu's supporting xsave/xrstor, these bytes
* are used to extended the fpstate pointer in the sigcontext, which now
* includes the extended state information along with fpstate information.
*
* Presence of FP_XSTATE_MAGIC1 at the beginning of this SW reserved
* area and FP_XSTATE_MAGIC2 at the end of memory layout
* (extended_size - FP_XSTATE_MAGIC2_SIZE) indicates the presence of the
* extended state information in the memory layout pointed by the fpstate
* pointer in sigcontext.
*/
struct _fpx_sw_bytes {
__u32 magic1; /* FP_XSTATE_MAGIC1 */
__u32 extended_size; /* total size of the layout referred by
* fpstate pointer in the sigcontext.
*/
__u64 xstate_bv;
/* feature bit mask (including fp/sse/extended
* state) that is present in the memory
* layout.
*/
__u32 xstate_size; /* actual xsave state size, based on the
* features saved in the layout.
* 'extended_size' will be greater than
* 'xstate_size'.
*/
__u32 padding[7]; /* for future use. */
};
#ifdef __i386__
/*
* As documented in the iBCS2 standard..
*
* The first part of "struct _fpstate" is just the normal i387
* hardware setup, the extra "status" word is used to save the
* coprocessor status word before entering the handler.
*
* Pentium III FXSR, SSE support
* Gareth Hughes <gareth@valinux.com>, May 2000
*
* The FPU state data structure has had to grow to accommodate the
* extended FPU state required by the Streaming SIMD Extensions.
* There is no documented standard to accomplish this at the moment.
*/
struct _fpreg {
unsigned short significand[4];
unsigned short exponent;
};
struct _fpxreg {
unsigned short significand[4];
unsigned short exponent;
unsigned short padding[3];
};
struct _xmmreg {
unsigned long element[4];
};
struct _fpstate {
/* Regular FPU environment */
unsigned long cw;
unsigned long sw;
unsigned long tag;
unsigned long ipoff;
unsigned long cssel;
unsigned long dataoff;
unsigned long datasel;
struct _fpreg _st[8];
unsigned short status;
unsigned short magic; /* 0xffff = regular FPU data only */
/* FXSR FPU environment */
unsigned long _fxsr_env[6]; /* FXSR FPU env is ignored */
unsigned long mxcsr;
unsigned long reserved;
struct _fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
struct _xmmreg _xmm[8];
unsigned long padding1[44];
union {
unsigned long padding2[12];
struct _fpx_sw_bytes sw_reserved; /* represents the extended
* state info */
};
};
#define X86_FXSR_MAGIC 0x0000
#ifdef __KERNEL__
struct sigcontext {
unsigned short gs, __gsh;
unsigned short fs, __fsh;
unsigned short es, __esh;
unsigned short ds, __dsh;
unsigned long di;
unsigned long si;
unsigned long bp;
unsigned long sp;
unsigned long bx;
unsigned long dx;
unsigned long cx;
unsigned long ax;
unsigned long trapno;
unsigned long err;
unsigned long ip;
unsigned short cs, __csh;
unsigned long flags;
unsigned long sp_at_signal;
unsigned short ss, __ssh;
/*
* fpstate is really (struct _fpstate *) or (struct _xstate *)
* depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
* bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
* of extended memory layout. See comments at the defintion of
* (struct _fpx_sw_bytes)
*/
void __user *fpstate; /* zero when no FPU/extended context */
unsigned long oldmask;
unsigned long cr2;
};
#else /* __KERNEL__ */
/*
* User-space might still rely on the old definition:
*/
struct sigcontext {
unsigned short gs, __gsh;
unsigned short fs, __fsh;
unsigned short es, __esh;
unsigned short ds, __dsh;
unsigned long edi;
unsigned long esi;
unsigned long ebp;
unsigned long esp;
unsigned long ebx;
unsigned long edx;
unsigned long ecx;
unsigned long eax;
unsigned long trapno;
unsigned long err;
unsigned long eip;
unsigned short cs, __csh;
unsigned long eflags;
unsigned long esp_at_signal;
unsigned short ss, __ssh;
struct _fpstate __user *fpstate;
unsigned long oldmask;
unsigned long cr2;
};
#endif /* !__KERNEL__ */
#else /* __i386__ */
/* FXSAVE frame */
/* Note: reserved1/2 may someday contain valuable data. Always save/restore
them when you change signal frames. */
struct _fpstate {
__u16 cwd;
__u16 swd;
__u16 twd; /* Note this is not the same as the
32bit/x87/FSAVE twd */
__u16 fop;
__u64 rip;
__u64 rdp;
__u32 mxcsr;
__u32 mxcsr_mask;
__u32 st_space[32]; /* 8*16 bytes for each FP-reg */
__u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg */
__u32 reserved2[12];
union {
__u32 reserved3[12];
struct _fpx_sw_bytes sw_reserved; /* represents the extended
* state information */
};
};
#ifdef __KERNEL__
struct sigcontext {
unsigned long r8;
unsigned long r9;
unsigned long r10;
unsigned long r11;
unsigned long r12;
unsigned long r13;
unsigned long r14;
unsigned long r15;
unsigned long di;
unsigned long si;
unsigned long bp;
unsigned long bx;
unsigned long dx;
unsigned long ax;
unsigned long cx;
unsigned long sp;
unsigned long ip;
unsigned long flags;
unsigned short cs;
unsigned short gs;
unsigned short fs;
unsigned short __pad0;
unsigned long err;
unsigned long trapno;
unsigned long oldmask;
unsigned long cr2;
/*
* fpstate is really (struct _fpstate *) or (struct _xstate *)
* depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
* bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
* of extended memory layout. See comments at the defintion of
* (struct _fpx_sw_bytes)
*/
void __user *fpstate; /* zero when no FPU/extended context */
unsigned long reserved1[8];
};
#else /* __KERNEL__ */
/*
* User-space might still rely on the old definition:
*/
struct sigcontext {
unsigned long r8;
unsigned long r9;
unsigned long r10;
unsigned long r11;
unsigned long r12;
unsigned long r13;
unsigned long r14;
unsigned long r15;
unsigned long rdi;
unsigned long rsi;
unsigned long rbp;
unsigned long rbx;
unsigned long rdx;
unsigned long rax;
unsigned long rcx;
unsigned long rsp;
unsigned long rip;
unsigned long eflags; /* RFLAGS */
unsigned short cs;
unsigned short gs;
unsigned short fs;
unsigned short __pad0;
unsigned long err;
unsigned long trapno;
unsigned long oldmask;
unsigned long cr2;
struct _fpstate __user *fpstate; /* zero when no FPU context */
unsigned long reserved1[8];
};
#endif /* !__KERNEL__ */
#endif /* !__i386__ */
struct _xsave_hdr {
__u64 xstate_bv;
__u64 reserved1[2];
__u64 reserved2[5];
};
/*
* Extended state pointed by the fpstate pointer in the sigcontext.
* In addition to the fpstate, information encoded in the xstate_hdr
* indicates the presence of other extended state information
* supported by the processor and OS.
*/
struct _xstate {
struct _fpstate fpstate;
struct _xsave_hdr xstate_hdr;
/* new processor state extensions go here */
};
#endif /* _ASM_X86_SIGCONTEXT_H */
|
