1 #ifndef _ASM_X86_INSN_H 2 #define _ASM_X86_INSN_H 3 /* 4 * x86 instruction analysis 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 * 20 * Copyright (C) IBM Corporation, 2009 21 */ 22 23 /* insn_attr_t is defined in inat.h */ 24 #include <asm/inat.h> 25 26 struct insn_field { 27 union { 28 insn_value_t value; 29 insn_byte_t bytes[4]; 30 }; 31 /* !0 if we've run insn_get_xxx() for this field */ 32 unsigned char got; 33 unsigned char nbytes; 34 }; 35 36 struct insn { 37 struct insn_field prefixes; /* 38 * Prefixes 39 * prefixes.bytes[3]: last prefix 40 */ 41 struct insn_field rex_prefix; /* REX prefix */ 42 struct insn_field opcode; /* 43 * opcode.bytes[0]: opcode1 44 * opcode.bytes[1]: opcode2 45 * opcode.bytes[2]: opcode3 46 */ 47 struct insn_field modrm; 48 struct insn_field sib; 49 struct insn_field displacement; 50 union { 51 struct insn_field immediate; 52 struct insn_field moffset1; /* for 64bit MOV */ 53 struct insn_field immediate1; /* for 64bit imm or off16/32 */ 54 }; 55 union { 56 struct insn_field moffset2; /* for 64bit MOV */ 57 struct insn_field immediate2; /* for 64bit imm or seg16 */ 58 }; 59 60 insn_attr_t attr; 61 unsigned char opnd_bytes; 62 unsigned char addr_bytes; 63 unsigned char length; 64 unsigned char x86_64; 65 66 const insn_byte_t *kaddr; /* kernel address of insn to analyze */ 67 const insn_byte_t *next_byte; 68 }; 69 70 #define X86_MODRM_MOD(modrm) (((modrm) & 0xc0) >> 6) 71 #define X86_MODRM_REG(modrm) (((modrm) & 0x38) >> 3) 72 #define X86_MODRM_RM(modrm) ((modrm) & 0x07) 73 74 #define X86_SIB_SCALE(sib) (((sib) & 0xc0) >> 6) 75 #define X86_SIB_INDEX(sib) (((sib) & 0x38) >> 3) 76 #define X86_SIB_BASE(sib) ((sib) & 0x07) 77 78 #define X86_REX_W(rex) ((rex) & 8) 79 #define X86_REX_R(rex) ((rex) & 4) 80 #define X86_REX_X(rex) ((rex) & 2) 81 #define X86_REX_B(rex) ((rex) & 1) 82 83 /* The last prefix is needed for two-byte and three-byte opcodes */ 84 static inline insn_byte_t insn_last_prefix(struct insn *insn) 85 { 86 return insn->prefixes.bytes[3]; 87 } 88 89 extern void insn_init(struct insn *insn, const void *kaddr, int x86_64); 90 extern void insn_get_prefixes(struct insn *insn); 91 extern void insn_get_opcode(struct insn *insn); 92 extern void insn_get_modrm(struct insn *insn); 93 extern void insn_get_sib(struct insn *insn); 94 extern void insn_get_displacement(struct insn *insn); 95 extern void insn_get_immediate(struct insn *insn); 96 extern void insn_get_length(struct insn *insn); 97 98 /* Attribute will be determined after getting ModRM (for opcode groups) */ 99 static inline void insn_get_attribute(struct insn *insn) 100 { 101 insn_get_modrm(insn); 102 } 103 104 /* Instruction uses RIP-relative addressing */ 105 extern int insn_rip_relative(struct insn *insn); 106 107 /* Init insn for kernel text */ 108 static inline void kernel_insn_init(struct insn *insn, const void *kaddr) 109 { 110 #ifdef CONFIG_X86_64 111 insn_init(insn, kaddr, 1); 112 #else /* CONFIG_X86_32 */ 113 insn_init(insn, kaddr, 0); 114 #endif 115 } 116 117 /* Offset of each field from kaddr */ 118 static inline int insn_offset_rex_prefix(struct insn *insn) 119 { 120 return insn->prefixes.nbytes; 121 } 122 static inline int insn_offset_opcode(struct insn *insn) 123 { 124 return insn_offset_rex_prefix(insn) + insn->rex_prefix.nbytes; 125 } 126 static inline int insn_offset_modrm(struct insn *insn) 127 { 128 return insn_offset_opcode(insn) + insn->opcode.nbytes; 129 } 130 static inline int insn_offset_sib(struct insn *insn) 131 { 132 return insn_offset_modrm(insn) + insn->modrm.nbytes; 133 } 134 static inline int insn_offset_displacement(struct insn *insn) 135 { 136 return insn_offset_sib(insn) + insn->sib.nbytes; 137 } 138 static inline int insn_offset_immediate(struct insn *insn) 139 { 140 return insn_offset_displacement(insn) + insn->displacement.nbytes; 141 } 142 143 #endif /* _ASM_X86_INSN_H */ 144