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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-29 13:29:24 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-30 13:49:27 -0400
commitbdd8caba5ed5bb7ee21c9f061597284ffeb280bf (patch)
tree036491dc4b283979f462008bc961800847187937 /include/asm-x86/sigcontext.h
parent9dc89c0f96a6ce6a1b7f9a47dd8bf6f17e2002c9 (diff)
x86, xsave: struct _fpstate extensions to include extended state information
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. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/sigcontext.h')
-rw-r--r--include/asm-x86/sigcontext.h87
1 files changed, 83 insertions, 4 deletions
diff --git a/include/asm-x86/sigcontext.h b/include/asm-x86/sigcontext.h
index 24879c85b291..899fe2f8abb9 100644
--- a/include/asm-x86/sigcontext.h
+++ b/include/asm-x86/sigcontext.h
@@ -4,6 +4,40 @@
4#include <linux/compiler.h> 4#include <linux/compiler.h>
5#include <asm/types.h> 5#include <asm/types.h>
6 6
7#define FP_XSTATE_MAGIC1 0x46505853U
8#define FP_XSTATE_MAGIC2 0x46505845U
9#define FP_XSTATE_MAGIC2_SIZE sizeof(FP_XSTATE_MAGIC2)
10
11/*
12 * bytes 464..511 in the current 512byte layout of fxsave/fxrstor frame
13 * are reserved for SW usage. On cpu's supporting xsave/xrstor, these bytes
14 * are used to extended the fpstate pointer in the sigcontext, which now
15 * includes the extended state information along with fpstate information.
16 *
17 * Presence of FP_XSTATE_MAGIC1 at the beginning of this SW reserved
18 * area and FP_XSTATE_MAGIC2 at the end of memory layout
19 * (extended_size - FP_XSTATE_MAGIC2_SIZE) indicates the presence of the
20 * extended state information in the memory layout pointed by the fpstate
21 * pointer in sigcontext.
22 */
23struct _fpx_sw_bytes {
24 __u32 magic1; /* FP_XSTATE_MAGIC1 */
25 __u32 extended_size; /* total size of the layout referred by
26 * fpstate pointer in the sigcontext.
27 */
28 __u64 xstate_bv;
29 /* feature bit mask (including fp/sse/extended
30 * state) that is present in the memory
31 * layout.
32 */
33 __u32 xstate_size; /* actual xsave state size, based on the
34 * features saved in the layout.
35 * 'extended_size' will be greater than
36 * 'xstate_size'.
37 */
38 __u32 padding[7]; /* for future use. */
39};
40
7#ifdef __i386__ 41#ifdef __i386__
8/* 42/*
9 * As documented in the iBCS2 standard.. 43 * As documented in the iBCS2 standard..
@@ -53,7 +87,13 @@ struct _fpstate {
53 unsigned long reserved; 87 unsigned long reserved;
54 struct _fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ 88 struct _fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */
55 struct _xmmreg _xmm[8]; 89 struct _xmmreg _xmm[8];
56 unsigned long padding[56]; 90 unsigned long padding1[44];
91
92 union {
93 unsigned long padding2[12];
94 struct _fpx_sw_bytes sw_reserved; /* represents the extended
95 * state info */
96 };
57}; 97};
58 98
59#define X86_FXSR_MAGIC 0x0000 99#define X86_FXSR_MAGIC 0x0000
@@ -79,7 +119,15 @@ struct sigcontext {
79 unsigned long flags; 119 unsigned long flags;
80 unsigned long sp_at_signal; 120 unsigned long sp_at_signal;
81 unsigned short ss, __ssh; 121 unsigned short ss, __ssh;
82 struct _fpstate __user *fpstate; 122
123 /*
124 * fpstate is really (struct _fpstate *) or (struct _xstate *)
125 * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
126 * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
127 * of extended memory layout. See comments at the defintion of
128 * (struct _fpx_sw_bytes)
129 */
130 void __user *fpstate; /* zero when no FPU/extended context */
83 unsigned long oldmask; 131 unsigned long oldmask;
84 unsigned long cr2; 132 unsigned long cr2;
85}; 133};
@@ -130,7 +178,12 @@ struct _fpstate {
130 __u32 mxcsr_mask; 178 __u32 mxcsr_mask;
131 __u32 st_space[32]; /* 8*16 bytes for each FP-reg */ 179 __u32 st_space[32]; /* 8*16 bytes for each FP-reg */
132 __u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg */ 180 __u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg */
133 __u32 reserved2[24]; 181 __u32 reserved2[12];
182 union {
183 __u32 reserved3[12];
184 struct _fpx_sw_bytes sw_reserved; /* represents the extended
185 * state information */
186 };
134}; 187};
135 188
136#ifdef __KERNEL__ 189#ifdef __KERNEL__
@@ -161,7 +214,15 @@ struct sigcontext {
161 unsigned long trapno; 214 unsigned long trapno;
162 unsigned long oldmask; 215 unsigned long oldmask;
163 unsigned long cr2; 216 unsigned long cr2;
164 struct _fpstate __user *fpstate; /* zero when no FPU context */ 217
218 /*
219 * fpstate is really (struct _fpstate *) or (struct _xstate *)
220 * depending on the FP_XSTATE_MAGIC1 encoded in the SW reserved
221 * bytes of (struct _fpstate) and FP_XSTATE_MAGIC2 present at the end
222 * of extended memory layout. See comments at the defintion of
223 * (struct _fpx_sw_bytes)
224 */
225 void __user *fpstate; /* zero when no FPU/extended context */
165 unsigned long reserved1[8]; 226 unsigned long reserved1[8];
166}; 227};
167#else /* __KERNEL__ */ 228#else /* __KERNEL__ */
@@ -202,4 +263,22 @@ struct sigcontext {
202 263
203#endif /* !__i386__ */ 264#endif /* !__i386__ */
204 265
266struct _xsave_hdr {
267 u64 xstate_bv;
268 u64 reserved1[2];
269 u64 reserved2[5];
270};
271
272/*
273 * Extended state pointed by the fpstate pointer in the sigcontext.
274 * In addition to the fpstate, information encoded in the xstate_hdr
275 * indicates the presence of other extended state information
276 * supported by the processor and OS.
277 */
278struct _xstate {
279 struct _fpstate fpstate;
280 struct _xsave_hdr xstate_hdr;
281 /* new processor state extensions go here */
282};
283
205#endif /* ASM_X86__SIGCONTEXT_H */ 284#endif /* ASM_X86__SIGCONTEXT_H */