1
2#ifndef _ASM_X86_INSN_H
3#define _ASM_X86_INSN_H
4
5
6
7
8
9
10#include <asm/byteorder.h>
11
12#include "inat.h"
13
14#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
15
16struct insn_field {
17 union {
18 insn_value_t value;
19 insn_byte_t bytes[4];
20 };
21
22 unsigned char got;
23 unsigned char nbytes;
24};
25
26static inline void insn_field_set(struct insn_field *p, insn_value_t v,
27 unsigned char n)
28{
29 p->value = v;
30 p->nbytes = n;
31}
32
33static inline void insn_set_byte(struct insn_field *p, unsigned char n,
34 insn_byte_t v)
35{
36 p->bytes[n] = v;
37}
38
39#else
40
41struct insn_field {
42 insn_value_t value;
43 union {
44 insn_value_t little;
45 insn_byte_t bytes[4];
46 };
47
48 unsigned char got;
49 unsigned char nbytes;
50};
51
52static inline void insn_field_set(struct insn_field *p, insn_value_t v,
53 unsigned char n)
54{
55 p->value = v;
56 p->little = __cpu_to_le32(v);
57 p->nbytes = n;
58}
59
60static inline void insn_set_byte(struct insn_field *p, unsigned char n,
61 insn_byte_t v)
62{
63 p->bytes[n] = v;
64 p->value = __le32_to_cpu(p->little);
65}
66#endif
67
68struct insn {
69 struct insn_field prefixes;
70
71
72
73 struct insn_field rex_prefix;
74 struct insn_field vex_prefix;
75 struct insn_field opcode;
76
77
78
79
80 struct insn_field modrm;
81 struct insn_field sib;
82 struct insn_field displacement;
83 union {
84 struct insn_field immediate;
85 struct insn_field moffset1;
86 struct insn_field immediate1;
87 };
88 union {
89 struct insn_field moffset2;
90 struct insn_field immediate2;
91 };
92
93 int emulate_prefix_size;
94 insn_attr_t attr;
95 unsigned char opnd_bytes;
96 unsigned char addr_bytes;
97 unsigned char length;
98 unsigned char x86_64;
99
100 const insn_byte_t *kaddr;
101 const insn_byte_t *end_kaddr;
102 const insn_byte_t *next_byte;
103};
104
105#define MAX_INSN_SIZE 15
106
107#define X86_MODRM_MOD(modrm) (((modrm) & 0xc0) >> 6)
108#define X86_MODRM_REG(modrm) (((modrm) & 0x38) >> 3)
109#define X86_MODRM_RM(modrm) ((modrm) & 0x07)
110
111#define X86_SIB_SCALE(sib) (((sib) & 0xc0) >> 6)
112#define X86_SIB_INDEX(sib) (((sib) & 0x38) >> 3)
113#define X86_SIB_BASE(sib) ((sib) & 0x07)
114
115#define X86_REX_W(rex) ((rex) & 8)
116#define X86_REX_R(rex) ((rex) & 4)
117#define X86_REX_X(rex) ((rex) & 2)
118#define X86_REX_B(rex) ((rex) & 1)
119
120
121#define X86_VEX_W(vex) ((vex) & 0x80)
122#define X86_VEX_R(vex) ((vex) & 0x80)
123#define X86_VEX_X(vex) ((vex) & 0x40)
124#define X86_VEX_B(vex) ((vex) & 0x20)
125#define X86_VEX_L(vex) ((vex) & 0x04)
126
127#define X86_EVEX_M(vex) ((vex) & 0x03)
128#define X86_VEX3_M(vex) ((vex) & 0x1f)
129#define X86_VEX2_M 1
130#define X86_VEX_V(vex) (((vex) & 0x78) >> 3)
131#define X86_VEX_P(vex) ((vex) & 0x03)
132#define X86_VEX_M_MAX 0x1f
133
134extern void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64);
135extern int insn_get_prefixes(struct insn *insn);
136extern int insn_get_opcode(struct insn *insn);
137extern int insn_get_modrm(struct insn *insn);
138extern int insn_get_sib(struct insn *insn);
139extern int insn_get_displacement(struct insn *insn);
140extern int insn_get_immediate(struct insn *insn);
141extern int insn_get_length(struct insn *insn);
142
143enum insn_mode {
144 INSN_MODE_32,
145 INSN_MODE_64,
146
147 INSN_MODE_KERN,
148 INSN_NUM_MODES,
149};
150
151extern int insn_decode(struct insn *insn, const void *kaddr, int buf_len, enum insn_mode m);
152
153#define insn_decode_kernel(_insn, _ptr) insn_decode((_insn), (_ptr), MAX_INSN_SIZE, INSN_MODE_KERN)
154
155
156static inline void insn_get_attribute(struct insn *insn)
157{
158 insn_get_modrm(insn);
159}
160
161
162extern int insn_rip_relative(struct insn *insn);
163
164static inline int insn_is_avx(struct insn *insn)
165{
166 if (!insn->prefixes.got)
167 insn_get_prefixes(insn);
168 return (insn->vex_prefix.value != 0);
169}
170
171static inline int insn_is_evex(struct insn *insn)
172{
173 if (!insn->prefixes.got)
174 insn_get_prefixes(insn);
175 return (insn->vex_prefix.nbytes == 4);
176}
177
178static inline int insn_has_emulate_prefix(struct insn *insn)
179{
180 return !!insn->emulate_prefix_size;
181}
182
183static inline insn_byte_t insn_vex_m_bits(struct insn *insn)
184{
185 if (insn->vex_prefix.nbytes == 2)
186 return X86_VEX2_M;
187 else if (insn->vex_prefix.nbytes == 3)
188 return X86_VEX3_M(insn->vex_prefix.bytes[1]);
189 else
190 return X86_EVEX_M(insn->vex_prefix.bytes[1]);
191}
192
193static inline insn_byte_t insn_vex_p_bits(struct insn *insn)
194{
195 if (insn->vex_prefix.nbytes == 2)
196 return X86_VEX_P(insn->vex_prefix.bytes[1]);
197 else
198 return X86_VEX_P(insn->vex_prefix.bytes[2]);
199}
200
201
202static inline int insn_last_prefix_id(struct insn *insn)
203{
204 if (insn_is_avx(insn))
205 return insn_vex_p_bits(insn);
206
207 if (insn->prefixes.bytes[3])
208 return inat_get_last_prefix_id(insn->prefixes.bytes[3]);
209
210 return 0;
211}
212
213
214static inline int insn_offset_rex_prefix(struct insn *insn)
215{
216 return insn->prefixes.nbytes;
217}
218static inline int insn_offset_vex_prefix(struct insn *insn)
219{
220 return insn_offset_rex_prefix(insn) + insn->rex_prefix.nbytes;
221}
222static inline int insn_offset_opcode(struct insn *insn)
223{
224 return insn_offset_vex_prefix(insn) + insn->vex_prefix.nbytes;
225}
226static inline int insn_offset_modrm(struct insn *insn)
227{
228 return insn_offset_opcode(insn) + insn->opcode.nbytes;
229}
230static inline int insn_offset_sib(struct insn *insn)
231{
232 return insn_offset_modrm(insn) + insn->modrm.nbytes;
233}
234static inline int insn_offset_displacement(struct insn *insn)
235{
236 return insn_offset_sib(insn) + insn->sib.nbytes;
237}
238static inline int insn_offset_immediate(struct insn *insn)
239{
240 return insn_offset_displacement(insn) + insn->displacement.nbytes;
241}
242
243
244
245
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247
248
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250
251
252
253
254
255#define for_each_insn_prefix(insn, idx, prefix) \
256 for (idx = 0; idx < ARRAY_SIZE(insn->prefixes.bytes) && (prefix = insn->prefixes.bytes[idx]) != 0; idx++)
257
258#define POP_SS_OPCODE 0x1f
259#define MOV_SREG_OPCODE 0x8e
260
261
262
263
264
265
266
267
268
269static inline int insn_masking_exception(struct insn *insn)
270{
271 return insn->opcode.bytes[0] == POP_SS_OPCODE ||
272 (insn->opcode.bytes[0] == MOV_SREG_OPCODE &&
273 X86_MODRM_REG(insn->modrm.bytes[0]) == 2);
274}
275
276#endif
277