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simulate arithmetic opcodes in quest script analysis

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This commit is contained in:
Martin Michelsen
2025-12-11 00:20:55 -08:00
parent 342b4df8c4
commit 1ab7a851be
1 changed files with 56 additions and 0 deletions
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src/QuestScript.cc
+56
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@@ -5306,6 +5306,25 @@ void populate_quest_metadata_from_script(
}
};
auto simulate_arithmetic_opcode = [&](bool is_imm, auto fn) {
uint8_t reg = r.get_u8();
uint32_t value;
if (is_imm) {
value = r.get_u32l();
} else {
uint8_t src_reg = r.get_u8();
if (regs.is_valid(src_reg)) {
value = regs.get(src_reg);
} else {
regs.invalidate(reg);
return;
}
}
if (regs.is_valid(reg)) {
regs.set(reg, fn(regs.get(reg), value));
}
};
switch (opcode) {
case 0x0000: // nop
break;
@@ -5375,6 +5394,43 @@ void populate_quest_metadata_from_script(
break;
}
case 0x0018: // add
case 0x0019: // addi
simulate_arithmetic_opcode(opcode & 1, [](uint32_t a, uint32_t b) -> uint32_t { return a + b; });
break;
case 0x001A: // sub
case 0x001B: // subi
simulate_arithmetic_opcode(opcode & 1, [](uint32_t a, uint32_t b) -> uint32_t { return a - b; });
break;
case 0x001C: // mul
case 0x001D: // muli
simulate_arithmetic_opcode(opcode & 1, [](uint32_t a, uint32_t b) -> uint32_t { return a * b; });
break;
case 0x001E: // div
case 0x001F: // divi
simulate_arithmetic_opcode(opcode & 1, [](uint32_t a, uint32_t b) -> uint32_t { return a / b; });
break;
case 0x0020: // and
case 0x0021: // andi
simulate_arithmetic_opcode(opcode & 1, [](uint32_t a, uint32_t b) -> uint32_t { return a & b; });
break;
case 0x0022: // or
case 0x0023: // ori
simulate_arithmetic_opcode(opcode & 1, [](uint32_t a, uint32_t b) -> uint32_t { return a | b; });
break;
case 0x0024: // xor
case 0x0025: // xori
simulate_arithmetic_opcode(opcode & 1, [](uint32_t a, uint32_t b) -> uint32_t { return a ^ b; });
break;
case 0x0026: // mod
case 0x0027: // modi
simulate_arithmetic_opcode((opcode & 1) ^ (opcode >> 7), [](uint32_t a, uint32_t b) -> uint32_t { return static_cast<int32_t>(a) % static_cast<int32_t>(b); });
break;
case 0x00E9: // mod2
case 0x00EA: // modi2
simulate_arithmetic_opcode((opcode & 1) ^ (opcode >> 7), [](uint32_t a, uint32_t b) -> uint32_t { return a % b; });
break;
case 0x0028: { // jmp
uint32_t offset = get_label_offset(r.get_u16l());
if (!done_fn_offsets.emplace(offset).second) {