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add debug traces to rtdisasm

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mykola2312 2024-08-19 00:55:53 +03:00
parent 89e6057fe4
commit ce5b3ee705
1 changed files with 22 additions and 0 deletions
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22
src/rtdisasm.c
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@ -1,5 +1,7 @@
#include "rtdisasm.h" #include "rtdisasm.h"
#include "rtdisasm_table.h" #include "rtdisasm_table.h"
#include "debug.h"
#include <stdio.h>
#include <string.h> #include <string.h>
// prefix definitions. must be declared with macro in order // prefix definitions. must be declared with macro in order
@ -216,6 +218,19 @@ static unsigned value2length(uint8_t value)
} }
} }
#ifdef DEBUG
static void print_opcodes(const instruction_t* ins)
{
fprintf(stderr, "opcodes ");
for (unsigned i = 0; i < ins->opcode_len; i++)
fprintf(stderr, "%02X ", ins->opcode[i]);
fprintf(stderr, "\n");
}
#else
#define print_opcodes(ins)
#endif
int rtdisasm_analyze_single(const uint8_t* code, uint8_t size) int rtdisasm_analyze_single(const uint8_t* code, uint8_t size)
{ {
const uint8_t* cur = code; const uint8_t* cur = code;
@ -240,6 +255,8 @@ int rtdisasm_analyze_single(const uint8_t* code, uint8_t size)
type = INSTRUCTION_VEX; type = INSTRUCTION_VEX;
} }
TRACE("type %d vex %d\n", type, vex);
// test if its rex prefix, if so we will look specifically for // test if its rex prefix, if so we will look specifically for
// instructions with rex prefix // instructions with rex prefix
int rex = test_rex_prefix(*cur); int rex = test_rex_prefix(*cur);
@ -249,9 +266,13 @@ int rtdisasm_analyze_single(const uint8_t* code, uint8_t size)
if (++cur >= end) return -1; if (++cur >= end) return -1;
} }
TRACE("rex %d\n", rex);
const instruction_t* ins = find_instruction(cur, type, vex, rex); const instruction_t* ins = find_instruction(cur, type, vex, rex);
if (!ins) return 0; // no instruction if (!ins) return 0; // no instruction
print_opcodes(ins);
// since we now instruction, we need advance past opcode bytes // since we now instruction, we need advance past opcode bytes
cur += ins->opcode_len; cur += ins->opcode_len;
if (cur >= end) return -1; if (cur >= end) return -1;
@ -266,6 +287,7 @@ int rtdisasm_analyze_single(const uint8_t* code, uint8_t size)
uint8_t has_sib, disp_len; uint8_t has_sib, disp_len;
analyze_modrm(modrm, &has_sib, &disp_len); analyze_modrm(modrm, &has_sib, &disp_len);
TRACE("modrm %02X has_sib %u disp_len %u\n", modrm, has_sib, disp_len);
if (has_sib) if (has_sib)
{ {