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Double look-back to 64 bytes to account for computed switch tables containing a nop before the branch instruction.

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CRACKbomber 2025-06-24 20:20:50 -04:00
parent 8782d4dbd7
commit 0ddb5e5eb7
1 changed files with 20 additions and 5 deletions
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25
XenonAnalyse/main.cpp
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@ -105,7 +105,7 @@ void ScanTable(const uint32_t* code, size_t base, SwitchTable& table)
{
ppc_insn insn;
uint32_t cr{ (uint32_t)-1 };
for (int i = 0; i < 32; i++)
for (int i = 0; i < 64; i++)
{
ppc::Disassemble(&code[-i], base - (4 * i), insn);
if (insn.opcode == nullptr)
@ -113,7 +113,11 @@ void ScanTable(const uint32_t* code, size_t base, SwitchTable& table)
continue;
}
if (cr == -1 && (insn.opcode->id == PPC_INST_BGT || insn.opcode->id == PPC_INST_BGTLR || insn.opcode->id == PPC_INST_BLE || insn.opcode->id == PPC_INST_BLELR))
// Handle conditional branches
if (cr == -1 && (insn.opcode->id == PPC_INST_BGT ||
insn.opcode->id == PPC_INST_BGTLR ||
insn.opcode->id == PPC_INST_BLE ||
insn.opcode->id == PPC_INST_BLELR))
{
cr = insn.operands[0];
if (insn.opcode->operands[1] != 0)
@ -121,16 +125,27 @@ void ScanTable(const uint32_t* code, size_t base, SwitchTable& table)
table.defaultLabel = insn.operands[1];
}
}
else if (cr != -1)
// Handle CMPLWI even if branch not found yet
else if (insn.opcode->id == PPC_INST_CMPLWI)
{
if (insn.opcode->id == PPC_INST_CMPLWI && insn.operands[0] == cr)
// Only process if we haven't found labels yet
if (table.labels.empty())
{
table.r = insn.operands[1];
table.labels.resize(insn.operands[2] + 1);
table.base = base;
break;
}
}
// Handle CMPLWI after branch detection
else if (cr != -1 &&
insn.opcode->id == PPC_INST_CMPLWI &&
insn.operands[0] == cr)
{
table.r = insn.operands[1];
table.labels.resize(insn.operands[2] + 1);
table.base = base;
break;
}
}
}