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No longer expose PrefixSet in header

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This commit is contained in:
Alexis Engelke
2019-01-13 18:42:47 +01:00
parent 9d3f34bcc6
commit 3ed7cb4a96
2 changed files with 52 additions and 39 deletions
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46
decode.c
View File

@@ -70,6 +70,34 @@ static const uint8_t _decode_table64[] = {
((size_t) ((uint8_t*) buf)[7] << 56))
#endif
enum PrefixSet
{
PREFIX_LOCK = INSTR_FLAG_LOCK,
PREFIX_REP = INSTR_FLAG_REP,
PREFIX_REPNZ = INSTR_FLAG_REPNZ,
PREFIX_REX = INSTR_FLAG_REX,
PREFIX_VEXL = INSTR_FLAG_VEXL,
PREFIX_SEG_FS = 1 << 8,
PREFIX_SEG_GS = 1 << 9,
PREFIX_SEG_CS = 1 << 10,
PREFIX_SEG_DS = 1 << 11,
PREFIX_SEG_ES = 1 << 12,
PREFIX_OPSZ = 1 << 13,
PREFIX_ADDRSZ = 1 << 14,
PREFIX_REXB = 1 << 15,
PREFIX_REXX = 1 << 16,
PREFIX_REXR = 1 << 17,
PREFIX_REXW = 1 << 18,
PREFIX_ESC_NONE = 0 << 19,
PREFIX_ESC_0F = 1 << 19,
PREFIX_ESC_0F38 = 2 << 19,
PREFIX_ESC_0F3A = 3 << 19,
PREFIX_ESC_MASK = 3 << 19,
PREFIX_VEX = 1 << 21,
};
typedef enum PrefixSet PrefixSet;
static
int
decode_prefixes(const uint8_t* buffer, int len, DecodeMode mode,
@@ -171,7 +199,7 @@ out:
static
int
decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr,
struct Operand* out_o1, struct Operand* out_o2)
PrefixSet prefixes, struct Operand* out_o1, struct Operand* out_o2)
{
int off = 0;
@@ -190,7 +218,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr,
{
uint8_t reg_idx = mod_reg;
#if defined(ARCH_X86_64)
reg_idx += instr->prefixes & PREFIX_REXR ? 8 : 0;
reg_idx += prefixes & PREFIX_REXR ? 8 : 0;
#endif
out_o2->type = OT_REG;
out_o2->reg = reg_idx;
@@ -200,7 +228,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr,
{
uint8_t reg_idx = rm;
#if defined(ARCH_X86_64)
reg_idx += instr->prefixes & PREFIX_REXB ? 8 : 0;
reg_idx += prefixes & PREFIX_REXB ? 8 : 0;
#endif
out_o1->type = OT_REG;
out_o1->reg = reg_idx;
@@ -222,7 +250,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr,
scale = ((sib & 0xc0) >> 6) + 1;
idx = (sib & 0x38) >> 3;
#if defined(ARCH_X86_64)
idx += instr->prefixes & PREFIX_REXX ? 8 : 0;
idx += prefixes & PREFIX_REXX ? 8 : 0;
#endif
base = sib & 0x07;
}
@@ -270,7 +298,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr,
uint8_t reg_idx = rm;
#if defined(ARCH_X86_64)
reg_idx += instr->prefixes & PREFIX_REXB ? 8 : 0;
reg_idx += prefixes & PREFIX_REXB ? 8 : 0;
#endif
out_o1->reg = reg_idx;
return off;
@@ -293,7 +321,7 @@ decode_modrm(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr,
{
uint8_t reg_idx = base;
#if defined(ARCH_X86_64)
reg_idx += instr->prefixes & PREFIX_REXB ? 8 : 0;
reg_idx += prefixes & PREFIX_REXB ? 8 : 0;
#endif
out_o1->reg = reg_idx;
}
@@ -428,7 +456,9 @@ decode(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr)
struct InstrDesc* desc = (struct InstrDesc*) table;
instr->type = desc->type;
instr->prefixes = prefixes;
instr->flags = prefixes & 0x7f;
if (mode == DECODE_64)
instr->flags |= INSTR_FLAG_64;
instr->address = (uintptr_t) buffer;
if (prefixes & PREFIX_SEG_FS)
@@ -508,7 +538,7 @@ decode(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr)
{
operand2 = &instr->operands[DESC_MODREG_IDX(desc)];
}
retval = decode_modrm(buffer + off, len - off, mode, instr,
retval = decode_modrm(buffer + off, len - off, mode, instr, prefixes,
operand1, operand2);
if (UNLIKELY(retval < 0))

45
decode.h
View File

@@ -69,34 +69,16 @@ typedef uint8_t Reg;
#define reg_is_none(reg) ((reg) == REG_NONE)
#define REG_NONE (0x3f)
enum PrefixSet
enum
{
PREFIX_SEG_FS = 1 << 0,
PREFIX_SEG_GS = 1 << 1,
PREFIX_SEG_CS = 1 << 12,
PREFIX_SEG_DS = 1 << 17,
PREFIX_SEG_ES = 1 << 18,
PREFIX_OPSZ = 1 << 2,
PREFIX_ADDRSZ = 1 << 3,
PREFIX_LOCK = 1 << 4,
PREFIX_REPNZ = 1 << 5,
PREFIX_REP = 1 << 6,
PREFIX_REX = 1 << 7,
PREFIX_REXB = 1 << 8,
PREFIX_REXX = 1 << 9,
PREFIX_REXR = 1 << 10,
PREFIX_REXW = 1 << 11,
PREFIX_ESC_NONE = 0 << 13,
PREFIX_ESC_0F = 1 << 13,
PREFIX_ESC_0F38 = 2 << 13,
PREFIX_ESC_0F3A = 3 << 13,
PREFIX_ESC_MASK = 3 << 13,
PREFIX_VEX = 1 << 15,
PREFIX_VEXL = 1 << 16,
INSTR_FLAG_LOCK = 1 << 0,
INSTR_FLAG_REP = 1 << 1,
INSTR_FLAG_REPNZ = 1 << 2,
INSTR_FLAG_REX = 1 << 3,
INSTR_FLAG_VEXL = 1 << 4,
INSTR_FLAG_64 = 1 << 7,
};
typedef enum PrefixSet PrefixSet;
enum OperandType
{
OT_NONE = 0,
@@ -116,6 +98,7 @@ struct Instr
{
uint16_t type;
struct Operand operands[4];
uint8_t flags;
uint8_t segment;
uint8_t op_size;
uint8_t addr_size;
@@ -126,7 +109,6 @@ struct Instr
uint8_t scale : 3;
uint8_t sreg : 5;
PrefixSet prefixes;
size_t immediate;
intptr_t disp;
@@ -139,11 +121,12 @@ typedef struct Instr Instr;
#define INSTR_SEGMENT(instr) ((instr)->segment)
#define INSTR_WIDTH(instr) ((instr)->op_size)
#define INSTR_ADDRSZ(instr) ((instr)->addr_size)
#define INSTR_HAS_REP(instr) ((instr)->prefixes & PREFIX_REP)
#define INSTR_HAS_REPNZ(instr) ((instr)->prefixes & PREFIX_REPNZ)
#define INSTR_HAS_LOCK(instr) ((instr)->prefixes & PREFIX_LOCK)
#define INSTR_HAS_ADDRSZ(instr) ((instr)->prefixes & PREFIX_ADDRSZ)
#define INSTR_HAS_REX(instr) ((instr)->prefixes & PREFIX_REX)
#define INSTR_IS64(instr) ((instr)->flags & INSTR_FLAG_64)
#define INSTR_HAS_REP(instr) ((instr)->flags & INSTR_FLAG_REP)
#define INSTR_HAS_REPNZ(instr) ((instr)->flags & INSTR_FLAG_REPNZ)
#define INSTR_HAS_LOCK(instr) ((instr)->flags & INSTR_FLAG_LOCK)
#define INSTR_HAS_REX(instr) ((instr)->flags & INSTR_FLAG_REX)
#define INSTR_HAS_VEXL(instr) ((instr)->flags & INSTR_FLAG_VEXL)
int decode(const uint8_t* buffer, int len, DecodeMode mode, Instr* out_instr);
void instr_format(const Instr* instr, char buffer[128]);