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Specify address via parameter

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This allows to decode instructions where the address of the buffer is
not the address of the instruction.
This commit is contained in:
Alexis Engelke
2019-01-14 19:52:03 +01:00
parent 55f6fda583
commit a799024066
3 changed files with 8 additions and 5 deletions
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7
decode.c
View File

@@ -358,7 +358,8 @@ struct InstrDesc
#define DESC_IMM_BYTE(desc) (((desc)->immediate >> 7) & 1) #define DESC_IMM_BYTE(desc) (((desc)->immediate >> 7) & 1)
int int
decode(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr) decode(const uint8_t* buffer, int len, DecodeMode mode, uintptr_t address,
Instr* instr)
{ {
const uint8_t* decode_table = NULL; const uint8_t* decode_table = NULL;
@@ -453,7 +454,7 @@ decode(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr)
instr->flags = prefixes & 0x7f; instr->flags = prefixes & 0x7f;
if (mode == DECODE_64) if (mode == DECODE_64)
instr->flags |= INSTR_FLAG_64; instr->flags |= INSTR_FLAG_64;
instr->address = (uintptr_t) buffer; instr->address = address;
uint8_t op_size = 0; uint8_t op_size = 0;
if (desc->gp_size_8) if (desc->gp_size_8)
@@ -630,7 +631,7 @@ decode(const uint8_t* buffer, int len, DecodeMode mode, Instr* instr)
if (imm_control == 4) if (imm_control == 4)
{ {
instr->immediate += (uintptr_t) buffer + off; instr->immediate += instr->address + off;
} }
struct Operand* operand = &instr->operands[DESC_IMM_IDX(desc)]; struct Operand* operand = &instr->operands[DESC_IMM_IDX(desc)];

3
decode.h
View File

@@ -131,7 +131,8 @@ typedef struct Instr Instr;
#define INSTR_HAS_REX(instr) ((instr)->flags & INSTR_FLAG_REX) #define INSTR_HAS_REX(instr) ((instr)->flags & INSTR_FLAG_REX)
#define INSTR_HAS_VEXL(instr) ((instr)->flags & INSTR_FLAG_VEXL) #define INSTR_HAS_VEXL(instr) ((instr)->flags & INSTR_FLAG_VEXL)
int decode(const uint8_t* buffer, int len, DecodeMode mode, Instr* out_instr); int decode(const uint8_t* buffer, int len, DecodeMode mode, uintptr_t address,
Instr* out_instr);
void instr_format(const Instr* instr, char buffer[128]); void instr_format(const Instr* instr, char buffer[128]);
#endif #endif

3
tests/driver.c
View File

@@ -72,7 +72,8 @@ main(int argc, char** argv)
while (current_off != length) while (current_off != length)
{ {
size_t remaining = length - current_off; size_t remaining = length - current_off;
int retval = decode(code + current_off, remaining, mode, &instr); int retval = decode(code + current_off, remaining, mode, 0x1234000,
&instr);
if (retval < 0) if (retval < 0)
goto fail; goto fail;
current_off += retval; current_off += retval;