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GP-164 Added ELF ARM relocation R_ARM_PREL31 and corrected issue with

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R_ARM_ABS32 relocation.
Fixes #2261, Fixes #2276
This commit is contained in:
ghidra1
2020-09-16 12:48:40 -04:00
parent da92b68bcd
commit f3b4e6de16
1 changed files with 22 additions and 4 deletions
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26
Ghidra/Processors/ARM/src/main/java/ghidra/app/util/bin/format/elf/relocation/ARM_ElfRelocationHandler.java
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@@ -83,8 +83,10 @@ public class ARM_ElfRelocationHandler extends ElfRelocationHandler {
break; break;
} }
case ARM_ElfRelocationConstants.R_ARM_ABS32: { // Target class: Data case ARM_ElfRelocationConstants.R_ARM_ABS32: { // Target class: Data
int oldValue = memory.getInt(relocationAddress); if (elfRelocationContext.extractAddend()) {
newValue = (int) (symbolValue + addend + oldValue); addend = memory.getInt(relocationAddress);
}
newValue = (int) (symbolValue + addend);
if (isThumb) { if (isThumb) {
newValue |= 1; newValue |= 1;
} }
@@ -92,8 +94,10 @@ public class ARM_ElfRelocationHandler extends ElfRelocationHandler {
break; break;
} }
case ARM_ElfRelocationConstants.R_ARM_REL32: { // Target class: Data case ARM_ElfRelocationConstants.R_ARM_REL32: { // Target class: Data
int oldValue = memory.getInt(relocationAddress); if (elfRelocationContext.extractAddend()) {
newValue = (int) (symbolValue + addend + oldValue); addend = memory.getInt(relocationAddress);
}
newValue = (int) (symbolValue + addend);
newValue -= offset; // PC relative newValue -= offset; // PC relative
if (isThumb) { if (isThumb) {
newValue |= 1; newValue |= 1;
@@ -101,6 +105,20 @@ public class ARM_ElfRelocationHandler extends ElfRelocationHandler {
memory.setInt(relocationAddress, newValue); memory.setInt(relocationAddress, newValue);
break; break;
} }
case ARM_ElfRelocationConstants.R_ARM_PREL31: { // Target class: Data
int oldValue = memory.getInt(relocationAddress);
if (elfRelocationContext.extractAddend()) {
addend = (oldValue << 1) >> 1;
}
newValue = (int) (symbolValue + addend);
newValue -= offset; // PC relative
if (isThumb) {
newValue |= 1;
}
newValue = (newValue & 0x7fffffff) + (oldValue & 0x80000000);
memory.setInt(relocationAddress, newValue);
break;
}
case ARM_ElfRelocationConstants.R_ARM_LDR_PC_G0: { // Target class: ARM Instruction case ARM_ElfRelocationConstants.R_ARM_LDR_PC_G0: { // Target class: ARM Instruction
int oldValue = memory.getInt(relocationAddress, instructionBigEndian); int oldValue = memory.getInt(relocationAddress, instructionBigEndian);
newValue = (int) (symbolValue + addend); newValue = (int) (symbolValue + addend);