2019-10-01 22:17:18 +02:00
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package cafeloader;
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import ghidra.app.util.bin.format.elf.*;
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import ghidra.app.util.bin.format.elf.relocation.ElfRelocationContext;
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import ghidra.app.util.bin.format.elf.relocation.ElfRelocationHandler;
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import ghidra.program.model.address.Address;
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import ghidra.program.model.listing.Program;
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import ghidra.program.model.mem.Memory;
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import ghidra.program.model.mem.MemoryAccessException;
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import ghidra.util.Msg;
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import ghidra.util.exception.InvalidInputException;
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import ghidra.util.exception.NotFoundException;
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import ghidra.program.model.symbol.ExternalLocation;
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import ghidra.program.model.symbol.RefType;
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import ghidra.program.model.symbol.SourceType;
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public class Cafe_ElfRelocationHandler extends ElfRelocationHandler {
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@Override
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public boolean canRelocate(ElfHeader elf) {
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return elf instanceof RplHeader;
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}
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@Override
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public void relocate(ElfRelocationContext elfRelocationContext, ElfRelocation relocation,
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Address relocationAddress) throws MemoryAccessException, NotFoundException {
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int type = relocation.getType();
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if (type == Cafe_ElfRelocationConstants.R_PPC_NONE) {
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return;
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}
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ElfHeader elf = elfRelocationContext.getElfHeader();
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Program program = elfRelocationContext.getProgram();
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Memory memory = program.getMemory();
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int symbolIndex = relocation.getSymbolIndex();
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int addend = (int) relocation.getAddend();
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int offset = (int) relocationAddress.getOffset();
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ElfSymbol sym = elfRelocationContext.getSymbol(symbolIndex);
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int symbolValue = (int) elfRelocationContext.getSymbolValue(sym);
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int oldValue = memory.getInt(relocationAddress);
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int newValue = 0;
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/*
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* If the symbol is in a SHT_RPL_IMPORTS section then we must add a memory
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* reference because it will be too far away for the actual relocation to
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* be valid itself.
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*/
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ElfSectionHeader symbolSection = elf.getSections()[sym.getSectionHeaderIndex()];
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if (symbolSection.getType() == Cafe_ElfExtension.SHT_RPL_IMPORTS.value) {
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String symbolSectionName = symbolSection.getNameAsString();
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if (symbolSectionName.startsWith(".dimport_")) {
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program.getReferenceManager().addMemoryReference(relocationAddress,
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elfRelocationContext.getSymbolAddress(sym), RefType.DATA, SourceType.IMPORTED, 0);
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} else if (symbolSectionName.startsWith(".fimport_")) {
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program.getReferenceManager().addMemoryReference(relocationAddress,
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elfRelocationContext.getSymbolAddress(sym), RefType.UNCONDITIONAL_CALL, SourceType.IMPORTED, 0);
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}
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2019-10-02 19:31:40 +02:00
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String rplName = symbolSectionName.split("import_")[1];
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if (!rplName.endsWith(".rpl")) {
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rplName += ".rpl";
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}
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ExternalLocation location = program.getExternalManager().getUniqueExternalLocation(rplName, sym.getNameAsString());
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if (location != null) {
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2019-10-01 22:17:18 +02:00
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try {
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program.getReferenceManager().addExternalReference(relocationAddress, 1,
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2019-10-02 19:31:40 +02:00
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location, SourceType.IMPORTED, RefType.UNCONDITIONAL_CALL);
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2019-10-01 22:17:18 +02:00
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} catch (InvalidInputException e) {
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Msg.warn(this, "addExternalReference failed with " + e);
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}
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2019-10-02 19:31:40 +02:00
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} else {
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Msg.warn(this, "Failed to find location for " + sym.getNameAsString());
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2019-10-01 22:17:18 +02:00
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}
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}
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switch (type) {
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case Cafe_ElfRelocationConstants.R_PPC_ADDR32:
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newValue = symbolValue + addend;
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memory.setInt(relocationAddress, newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_ADDR16_LO:
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newValue = symbolValue + addend;
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_ADDR16_HI:
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newValue = (symbolValue + addend) >> 16;
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_ADDR16_HA:
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newValue = (symbolValue + addend + 0x8000) >> 16;
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_REL24:
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newValue = (symbolValue + addend - offset) >> 2;
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newValue = ((newValue << 2) & Cafe_ElfRelocationConstants.PPC_LOW24);
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newValue = (oldValue & ~Cafe_ElfRelocationConstants.PPC_LOW24) | newValue;
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memory.setInt(relocationAddress, newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_REL14:
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newValue = (symbolValue + addend - offset) >> 2;
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newValue = (oldValue & ~Cafe_ElfRelocationConstants.PPC_LOW14) |
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((newValue << 2) & Cafe_ElfRelocationConstants.PPC_LOW14);
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memory.setInt(relocationAddress, newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_GHS_REL16_HA:
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newValue = (symbolValue + addend - offset + 0x8000) >> 16;
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_GHS_REL16_HI:
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newValue = (symbolValue + addend - offset) >> 16;
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_GHS_REL16_LO:
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newValue = (symbolValue + addend - offset);
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_DTPREL32:
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newValue = symbolValue + addend;
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memory.setInt(relocationAddress, newValue);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_DTPMOD32:
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// TODO: Do we need a tlsModuleIndex?
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// *virt_cast<int32_t *>(target) = tlsModuleIndex;
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memory.setInt(relocationAddress, 0);
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break;
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case Cafe_ElfRelocationConstants.R_PPC_EMB_SDA21:
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// TODO: SDA relocations require sda / sda2 base from SHT_RPL_FILEINFO section
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case Cafe_ElfRelocationConstants.R_PPC_EMB_RELSDA:
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case Cafe_ElfRelocationConstants.R_PPC_DIAB_SDA21_LO:
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case Cafe_ElfRelocationConstants.R_PPC_DIAB_SDA21_HI:
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case Cafe_ElfRelocationConstants.R_PPC_DIAB_SDA21_HA:
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case Cafe_ElfRelocationConstants.R_PPC_DIAB_RELSDA_LO:
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case Cafe_ElfRelocationConstants.R_PPC_DIAB_RELSDA_HI:
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case Cafe_ElfRelocationConstants.R_PPC_DIAB_RELSDA_HA:
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default:
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String symbolName = sym.getNameAsString();
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markAsUnhandled(program, relocationAddress, type, symbolIndex, symbolName,
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elfRelocationContext.getLog());
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break;
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}
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}
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}
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