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GP-1110 Refactor ElfDefaultGotPltMarkup.processDynamicPLTGOT implementation, Correct duplicate ELF relocation table processing, and other minor ELF cleanup

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ghidra1 2021-08-02 15:58:37 -04:00
parent 3c1e51d0c0
commit 0a24532bf7
9 changed files with 346 additions and 130 deletions
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10
Ghidra/Processors/PowerPC/src/main/java/ghidra/app/util/bin/format/elf/extend/PowerPC64_ElfExtension.java
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@ -35,6 +35,9 @@ import ghidra.util.task.TaskMonitor;
public class PowerPC64_ElfExtension extends ElfExtension {
private static final int PLT_ENTRY_SIZE = 8; // could be 16(local) or 24 w/ opd_api, 32 for VxWorks
private static final int PLT_HEAD_SIZE = 16; // could be 24 w/ obd_api, 32 for VxWorks
// Elf Dynamic Type Extensions
public static final ElfDynamicType DT_PPC64_GLINK = new ElfDynamicType(0x70000000,
"DT_PPC64_GLINK", "Specify the start of the .glink section", ElfDynamicValueType.ADDRESS);
@ -225,8 +228,7 @@ public class PowerPC64_ElfExtension extends ElfExtension {
}
Program program = elfLoadHelper.getProgram();
MemoryBlock pltBlock = program.getMemory().getBlock(pltSection.getNameAsString());
// TODO: This is a band-aid since there are many PLT implementations and this assumes only one.
if (pltBlock == null || pltBlock.getSize() <= ElfConstants.PLT_ENTRY_SIZE) {
if (pltBlock == null) {
return;
}
if (pltSection.isExecutable()) {
@ -243,14 +245,14 @@ public class PowerPC64_ElfExtension extends ElfExtension {
// TODO: Uncertain
Address addr = pltBlock.getStart().add(ElfConstants.PLT_ENTRY_SIZE);
Address addr = pltBlock.getStart().add(PLT_HEAD_SIZE);
try {
while (addr.compareTo(pltBlock.getEnd()) < 0) {
monitor.checkCanceled();
if (elfLoadHelper.createData(addr, PointerDataType.dataType) == null) {
break; // stop early if failed to create a pointer
}
addr = addr.addNoWrap(8);
addr = addr.addNoWrap(PLT_ENTRY_SIZE);
}
}
catch (AddressOverflowException e) {