This source file includes following definitions.
- insn_get_attribute
- kernel_insn_init
- insn_is_avx
- insn_is_evex
- insn_complete
- insn_vex_m_bits
- insn_vex_p_bits
- insn_last_prefix_id
- insn_offset_rex_prefix
- insn_offset_vex_prefix
- insn_offset_opcode
- insn_offset_modrm
- insn_offset_sib
- insn_offset_displacement
- insn_offset_immediate
- insn_masking_exception
1
2 #ifndef _ASM_X86_INSN_H
3 #define _ASM_X86_INSN_H
4
5
6
7
8
9
10
11 #include <asm/inat.h>
12
13 struct insn_field {
14 union {
15 insn_value_t value;
16 insn_byte_t bytes[4];
17 };
18
19 unsigned char got;
20 unsigned char nbytes;
21 };
22
23 struct insn {
24 struct insn_field prefixes;
25
26
27
28 struct insn_field rex_prefix;
29 struct insn_field vex_prefix;
30 struct insn_field opcode;
31
32
33
34
35 struct insn_field modrm;
36 struct insn_field sib;
37 struct insn_field displacement;
38 union {
39 struct insn_field immediate;
40 struct insn_field moffset1;
41 struct insn_field immediate1;
42 };
43 union {
44 struct insn_field moffset2;
45 struct insn_field immediate2;
46 };
47
48 insn_attr_t attr;
49 unsigned char opnd_bytes;
50 unsigned char addr_bytes;
51 unsigned char length;
52 unsigned char x86_64;
53
54 const insn_byte_t *kaddr;
55 const insn_byte_t *end_kaddr;
56 const insn_byte_t *next_byte;
57 };
58
59 #define MAX_INSN_SIZE 15
60
61 #define X86_MODRM_MOD(modrm) (((modrm) & 0xc0) >> 6)
62 #define X86_MODRM_REG(modrm) (((modrm) & 0x38) >> 3)
63 #define X86_MODRM_RM(modrm) ((modrm) & 0x07)
64
65 #define X86_SIB_SCALE(sib) (((sib) & 0xc0) >> 6)
66 #define X86_SIB_INDEX(sib) (((sib) & 0x38) >> 3)
67 #define X86_SIB_BASE(sib) ((sib) & 0x07)
68
69 #define X86_REX_W(rex) ((rex) & 8)
70 #define X86_REX_R(rex) ((rex) & 4)
71 #define X86_REX_X(rex) ((rex) & 2)
72 #define X86_REX_B(rex) ((rex) & 1)
73
74
75 #define X86_VEX_W(vex) ((vex) & 0x80)
76 #define X86_VEX_R(vex) ((vex) & 0x80)
77 #define X86_VEX_X(vex) ((vex) & 0x40)
78 #define X86_VEX_B(vex) ((vex) & 0x20)
79 #define X86_VEX_L(vex) ((vex) & 0x04)
80
81 #define X86_EVEX_M(vex) ((vex) & 0x03)
82 #define X86_VEX3_M(vex) ((vex) & 0x1f)
83 #define X86_VEX2_M 1
84 #define X86_VEX_V(vex) (((vex) & 0x78) >> 3)
85 #define X86_VEX_P(vex) ((vex) & 0x03)
86 #define X86_VEX_M_MAX 0x1f
87
88 extern void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64);
89 extern void insn_get_prefixes(struct insn *insn);
90 extern void insn_get_opcode(struct insn *insn);
91 extern void insn_get_modrm(struct insn *insn);
92 extern void insn_get_sib(struct insn *insn);
93 extern void insn_get_displacement(struct insn *insn);
94 extern void insn_get_immediate(struct insn *insn);
95 extern void insn_get_length(struct insn *insn);
96
97
98 static inline void insn_get_attribute(struct insn *insn)
99 {
100 insn_get_modrm(insn);
101 }
102
103
104 extern int insn_rip_relative(struct insn *insn);
105
106
107 static inline void kernel_insn_init(struct insn *insn,
108 const void *kaddr, int buf_len)
109 {
110 #ifdef CONFIG_X86_64
111 insn_init(insn, kaddr, buf_len, 1);
112 #else
113 insn_init(insn, kaddr, buf_len, 0);
114 #endif
115 }
116
117 static inline int insn_is_avx(struct insn *insn)
118 {
119 if (!insn->prefixes.got)
120 insn_get_prefixes(insn);
121 return (insn->vex_prefix.value != 0);
122 }
123
124 static inline int insn_is_evex(struct insn *insn)
125 {
126 if (!insn->prefixes.got)
127 insn_get_prefixes(insn);
128 return (insn->vex_prefix.nbytes == 4);
129 }
130
131
132 static inline int insn_complete(struct insn *insn)
133 {
134 return insn->opcode.got && insn->modrm.got && insn->sib.got &&
135 insn->displacement.got && insn->immediate.got;
136 }
137
138 static inline insn_byte_t insn_vex_m_bits(struct insn *insn)
139 {
140 if (insn->vex_prefix.nbytes == 2)
141 return X86_VEX2_M;
142 else if (insn->vex_prefix.nbytes == 3)
143 return X86_VEX3_M(insn->vex_prefix.bytes[1]);
144 else
145 return X86_EVEX_M(insn->vex_prefix.bytes[1]);
146 }
147
148 static inline insn_byte_t insn_vex_p_bits(struct insn *insn)
149 {
150 if (insn->vex_prefix.nbytes == 2)
151 return X86_VEX_P(insn->vex_prefix.bytes[1]);
152 else
153 return X86_VEX_P(insn->vex_prefix.bytes[2]);
154 }
155
156
157 static inline int insn_last_prefix_id(struct insn *insn)
158 {
159 if (insn_is_avx(insn))
160 return insn_vex_p_bits(insn);
161
162 if (insn->prefixes.bytes[3])
163 return inat_get_last_prefix_id(insn->prefixes.bytes[3]);
164
165 return 0;
166 }
167
168
169 static inline int insn_offset_rex_prefix(struct insn *insn)
170 {
171 return insn->prefixes.nbytes;
172 }
173 static inline int insn_offset_vex_prefix(struct insn *insn)
174 {
175 return insn_offset_rex_prefix(insn) + insn->rex_prefix.nbytes;
176 }
177 static inline int insn_offset_opcode(struct insn *insn)
178 {
179 return insn_offset_vex_prefix(insn) + insn->vex_prefix.nbytes;
180 }
181 static inline int insn_offset_modrm(struct insn *insn)
182 {
183 return insn_offset_opcode(insn) + insn->opcode.nbytes;
184 }
185 static inline int insn_offset_sib(struct insn *insn)
186 {
187 return insn_offset_modrm(insn) + insn->modrm.nbytes;
188 }
189 static inline int insn_offset_displacement(struct insn *insn)
190 {
191 return insn_offset_sib(insn) + insn->sib.nbytes;
192 }
193 static inline int insn_offset_immediate(struct insn *insn)
194 {
195 return insn_offset_displacement(insn) + insn->displacement.nbytes;
196 }
197
198 #define POP_SS_OPCODE 0x1f
199 #define MOV_SREG_OPCODE 0x8e
200
201
202
203
204
205
206
207
208
209 static inline int insn_masking_exception(struct insn *insn)
210 {
211 return insn->opcode.bytes[0] == POP_SS_OPCODE ||
212 (insn->opcode.bytes[0] == MOV_SREG_OPCODE &&
213 X86_MODRM_REG(insn->modrm.bytes[0]) == 2);
214 }
215
216 #endif