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PPCAnalyst: Prevent PanicAlert due to invalid read

This commit is contained in:
Sepalani 2017-03-28 17:45:17 +01:00
parent a2cba6d72f
commit 3f2f3679cd
1 changed files with 13 additions and 7 deletions
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20
Source/Core/Core/PowerPC/PPCAnalyst.cpp
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@ -94,7 +94,6 @@ bool AnalyzeFunction(u32 startAddr, Symbol& func, int max_size)
if (func.size >= CODEBUFFER_SIZE * 4) // weird
return false;
const UGeckoInstruction instr = PowerPC::HostRead_Instruction(addr);
if (max_size && func.size > max_size)
{
func.address = startAddr;
@ -104,7 +103,9 @@ bool AnalyzeFunction(u32 startAddr, Symbol& func, int max_size)
func.flags |= FFLAG_STRAIGHT;
return true;
}
if (PPCTables::IsValidInstruction(instr))
const PowerPC::TryReadInstResult read_result = PowerPC::TryReadInstruction(addr);
const UGeckoInstruction instr = read_result.hex;
if (read_result.valid && PPCTables::IsValidInstruction(instr))
{
if (instr.hex == 0x4e800020) // 4e800021 is blrl, not the end of a function
{
@ -271,9 +272,10 @@ static void FindFunctionsFromBranches(u32 startAddr, u32 endAddr, SymbolDB* func
{
for (u32 addr = startAddr; addr < endAddr; addr += 4)
{
const UGeckoInstruction instr = PowerPC::HostRead_Instruction(addr);
const PowerPC::TryReadInstResult read_result = PowerPC::TryReadInstruction(addr);
const UGeckoInstruction instr = read_result.hex;
if (PPCTables::IsValidInstruction(instr))
if (read_result.valid && PPCTables::IsValidInstruction(instr))
{
switch (instr.OPCD)
{
@ -309,11 +311,15 @@ static void FindFunctionsAfterBLR(PPCSymbolDB* func_db)
{
while (true)
{
// skip zeroes that sometimes pad function to 16 byte boundary (e.g. Donkey Kong Country
// Skip zeroes that sometimes pad function to 16 byte boundary (e.g. Donkey Kong Country
// Returns)
while (PowerPC::HostRead_Instruction(location) == 0 && ((location & 0xf) != 0))
PowerPC::TryReadInstResult read_result = PowerPC::TryReadInstruction(location);
while (read_result.valid && read_result.hex == 0 && (location & 0xf) != 0)
{
location += 4;
if (PPCTables::IsValidInstruction(PowerPC::HostRead_Instruction(location)))
read_result = PowerPC::TryReadInstruction(location);
}
if (read_result.valid && PPCTables::IsValidInstruction(read_result.hex))
{
// check if this function is already mapped
Symbol* f = func_db->AddFunction(location);