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Scan direct calls to find functions.

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This commit is contained in:
Skyth
2024-09-18 22:13:24 +03:00
parent 3cd6886825
commit 39a0b6ab4d
2 changed files with 71 additions and 54 deletions
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7
PowerAnalyse/function.cpp
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@@ -137,13 +137,6 @@ Function Function::Analyze(const void* code, size_t size, size_t base)
if (op == PPC_OP_B)
{
// Tail call, no need to chase
if (blocks.size() == 1)
{
RESTORE_DATA();
continue;
}
assert(!PPC_BA(instruction));
const auto branchDest = addr + PPC_BI(instruction);

116
PowerRecomp/main.cpp
View File

@@ -122,6 +122,50 @@ int main(int argc, char* argv[])
}
}
auto hardcodedFuncCheck = [&](Function& f)
{
if (f.base == 0x824E7EF0) f.size = 0x98;
else if (f.base == 0x824E7F28) f.size = 0x60;
else if (f.base == 0x82C980E8) f.size = 0x110;
else if (f.base == 0x82CF7080) f.size = 0x80;
else if (f.base == 0x82D9AC08) f.size = 0x78;
else if (f.base == 0x82E86770) f.size = 0x98;
else if (f.base == 0x82E97E50) f.size = 0x84;
else if (f.base == 0x82EE2D08) f.size = 0x154;
else if (f.base == 0x82EF5C38) f.size = 0x64;
else if (f.base == 0x82EF5D78) f.size = 0x3F8;
else if (f.base == 0x82F08730) f.size = 0x2B0;
else if (f.base == 0x82F098C0) f.size = 0x19C;
else if (f.base == 0x82F13980) f.size = 0xF4;
else if (f.base == 0x82F1D668) f.size = 0x1E8;
else if (f.base == 0x82F22908) f.size = 0x20C;
else if (f.base == 0x82F25FD8) f.size = 0x240;
else if (f.base == 0x82F852A0) f.size = 0xCC;
else if (f.base == 0x830DADA0) f.size = 0x150;
else if (f.base == 0x831487D0) f.size = 0xD4;
else if (f.base == 0x831530C8) f.size = 0x258;
else if (f.base == 0x831539E0) f.size = 0xD0;
else if (f.base == 0x83168940) f.size = 0x100;
else if (f.base == 0x83168A48) f.size = 0x11C;
else if (f.base == 0x83168B70) f.size = 0x128;
else if (f.base == 0x83168F18) f.size = 0x254;
else if (f.base == 0x8316C678) f.size = 0x78;
else if (f.base == 0x8317CD30) f.size = 0x50;
else if (f.base == 0x83180700) f.size = 0x74;
else if (f.base == 0x8319ED58) f.size = 0x98;
else if (f.base == 0x82455E70) f.size = 0x84;
else if (f.base == 0x82456DC8) f.size = 0xD4;
else if (f.base == 0x826ABB70) f.size = 0x70;
else if (f.base == 0x82893088) f.size = 0x45C;
else if (f.base == 0x82C49540) f.size = 0x114;
else if (f.base == 0x82DE35D8) f.size = 0x68;
else if (f.base == 0x82DE3640) f.size = 0x64;
else if (f.base == 0x82DE36A8) f.size = 0x5C;
else if (f.base == 0x82DE3708) f.size = 0x198;
else if (f.base == 0x82DE38A0) f.size = 0x16C;
else if (f.base == 0x830B7DD0) f.size = 0x74;
};
for (const auto& section : image.sections)
{
if (!(section.flags & SectionFlags_Code))
@@ -131,7 +175,27 @@ int main(int argc, char* argv[])
size_t base = section.base;
uint8_t* data = section.data;
uint8_t* dataEnd = section.data + section.size;
while (data < dataEnd)
{
uint32_t insn = std::byteswap(*(uint32_t*)data);
if (PPC_OP(insn) == PPC_OP_B && PPC_BL(insn))
{
size_t address = base + (data - section.data) + PPC_BI(insn);
if (image.symbols.find(address) == image.symbols.end())
{
auto& fn = functions.emplace_back(Function::Analyze(section.data + address - section.base, section.size - (address - section.base), address));
hardcodedFuncCheck(fn);
image.symbols.emplace(std::format("sub_{:X}", fn.base), fn.base, fn.size, Symbol_Function);
}
}
data += 4;
}
data = section.data;
const Symbol* prevSymbol = nullptr;
while (data < dataEnd)
{
if (*(uint32_t*)data == 0)
@@ -159,42 +223,12 @@ int main(int argc, char* argv[])
}
else
{
auto& missingFn = functions.emplace_back(Function::Analyze(data, dataEnd - data, base));
auto& fn = functions.emplace_back(Function::Analyze(data, dataEnd - data, base));
hardcodedFuncCheck(fn);
image.symbols.emplace(std::format("sub_{:X}", fn.base), fn.base, fn.size, Symbol_Function);
if (base == 0x824E7EF0) missingFn.size = 0x98;
else if (base == 0x824E7F28) missingFn.size = 0x60;
else if (base == 0x82C980E8) missingFn.size = 0x110;
else if (base == 0x82CF7080) missingFn.size = 0x80;
else if (base == 0x82D9AC08) missingFn.size = 0x78;
else if (base == 0x82E86770) missingFn.size = 0x98;
else if (base == 0x82E97E50) missingFn.size = 0x84;
else if (base == 0x82EE2D08) missingFn.size = 0x154;
else if (base == 0x82EF5C38) missingFn.size = 0x64;
else if (base == 0x82EF5D78) missingFn.size = 0x3F8;
else if (base == 0x82F08730) missingFn.size = 0x2B0;
else if (base == 0x82F098C0) missingFn.size = 0x19C;
else if (base == 0x82F13980) missingFn.size = 0xF4;
else if (base == 0x82F1D668) missingFn.size = 0x1E8;
else if (base == 0x82F22908) missingFn.size = 0x20C;
else if (base == 0x82F25FD8) missingFn.size = 0x240;
else if (base == 0x82F852A0) missingFn.size = 0xCC;
else if (base == 0x830DADA0) missingFn.size = 0x150;
else if (base == 0x831487D0) missingFn.size = 0xD4;
else if (base == 0x831530C8) missingFn.size = 0x258;
else if (base == 0x831539E0) missingFn.size = 0xD0;
else if (base == 0x83168940) missingFn.size = 0x100;
else if (base == 0x83168A48) missingFn.size = 0x11C;
else if (base == 0x83168B70) missingFn.size = 0x128;
else if (base == 0x83168F18) missingFn.size = 0x254;
else if (base == 0x8316C678) missingFn.size = 0x78;
else if (base == 0x8317CD30) missingFn.size = 0x50;
else if (base == 0x83180700) missingFn.size = 0x74;
else if (base == 0x8319ED58) missingFn.size = 0x98;
image.symbols.emplace(std::format("sub_{:X}", missingFn.base), missingFn.base, missingFn.size, Symbol_Function);
base += missingFn.size;
data += missingFn.size;
base += fn.size;
data += fn.size;
}
}
}
@@ -449,19 +483,9 @@ int main(int argc, char* argv[])
println("\tcase {}:", i);
auto label = switchTable->second.labels[i];
if (label < fn.base || label >= fn.base + fn.size)
{
auto targetSymbol = image.symbols.find(label);
if (targetSymbol != image.symbols.end() && targetSymbol->address == label && targetSymbol->type == Symbol_Function)
{
println("\t\t{}(ctx, base);", targetSymbol->name);
}
else
{
println("\t\t// ERROR: 0x{:X}", label);
std::println("ERROR: Switch case at {:X} calling a function that has no defined symbol: {:X}", base - 4, label);
}
std::println("ERROR: Switch case at {:X} is trying to jump outside function: {:X}", base - 4, label);
println("\t\treturn;");
}
else