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GP-2213_emteere support for 24-bit spaces, byte addressed code space, hex importer fixes, AVR8 relocations
This commit is contained in:
emteere
parent
cd7599e3b9
commit
b34f43e685
13 changed files with 532 additions and 102 deletions
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/* ###
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* IP: GHIDRA
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ghidra.app.util.bin.format.elf.relocation;
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import ghidra.app.util.bin.format.elf.AVR8_ElfRelocationConstants;
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import ghidra.app.util.bin.format.elf.ElfConstants;
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import ghidra.app.util.bin.format.elf.ElfHeader;
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import ghidra.app.util.bin.format.elf.ElfRelocation;
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import ghidra.app.util.bin.format.elf.ElfSymbol;
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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.exception.NotFoundException;
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public class AVR8_ElfRelocationHandler extends ElfRelocationHandler {
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@Override
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public boolean canRelocate(ElfHeader elf) {
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return elf.e_machine() == ElfConstants.EM_AVR;
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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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Program program = elfRelocationContext.getProgram();
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Memory memory = program.getMemory();
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int type = relocation.getType();
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int symbolIndex = relocation.getSymbolIndex();
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long addend = relocation.getAddend(); // will be 0 for REL case
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ElfHeader elf = elfRelocationContext.getElfHeader();
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if ((symbolIndex == 0) && (elf.e_machine() == ElfConstants.EM_AVR)) {
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// System.out.println("ZERO_SYMBOL_TYPE = " + type + ", Offset = " + offset + ",
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// Addend = " + addend);
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}
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else if (symbolIndex == 0) {
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return;
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}
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// WARNING: offset is in bytes
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// be careful, word address potentially with byte indexes
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long offset = relocationAddress.getOffset();
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ElfSymbol sym = elfRelocationContext.getSymbol(symbolIndex);
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// WARNING: symbolValue here is not in bytes.
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// it is an addressable word offset for the symbols address space
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long symbolValue = elfRelocationContext.getSymbolValue(sym);
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String symbolName = sym.getNameAsString();
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int oldValue = memory.getShort(relocationAddress);
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if (elf.e_machine() != ElfConstants.EM_AVR) {
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return;
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}
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int newValue = 0;
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switch (type) {
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case AVR8_ElfRelocationConstants.R_AVR_NONE:
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break;
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case AVR8_ElfRelocationConstants.R_AVR_32:
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newValue = (((int) symbolValue + (int) addend) & 0xffffffff);
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memory.setInt(relocationAddress, newValue);
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break;
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case AVR8_ElfRelocationConstants.R_AVR_7_PCREL:
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newValue = (int) ((symbolValue * 2 + (int) addend - offset));
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newValue -= 2; // branch PC is offset+2
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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if (newValue > ((1 << 7) - 1) || (newValue < -(1 << 7))) {
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markAsError(program, relocationAddress, type, symbolName, "relocation overflow",
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elfRelocationContext.getLog());
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return;
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}
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newValue = (oldValue & 0xfc07) | (((newValue >> 1) << 3) & 0x3f8);
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case AVR8_ElfRelocationConstants.R_AVR_13_PCREL:
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newValue = (int) ((symbolValue * 2 + (int) addend - offset));
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newValue -= 2; // branch PC is offset+2
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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if (newValue < -2048 || newValue > 2047) {
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markAsWarning(program, relocationAddress, symbolName, symbolName, symbolIndex,
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"possible relocation error", elfRelocationContext.getLog());
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}
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newValue = (oldValue & 0xf000) | (newValue & 0xfff);
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memory.setShort(relocationAddress, (short) newValue);
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break;
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case AVR8_ElfRelocationConstants.R_AVR_16:
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newValue = ((int) symbolValue + (int) addend);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_16_PM:
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newValue = (((int) symbolValue * 2 + (int) addend));
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newValue >>= 1;
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_LO8_LDI:
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newValue = (((int) symbolValue + (int) addend));
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HI8_LDI:
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newValue = (((int) symbolValue + (int) addend));
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newValue = (newValue >> 8) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HH8_LDI:
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newValue = (((int) symbolValue + (int) addend));
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newValue = (newValue >> 16) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_LO8_LDI_NEG:
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newValue = (((int) symbolValue + (int) addend));
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newValue = -newValue;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HI8_LDI_NEG:
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newValue = (((int) symbolValue + (int) addend));
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newValue = -newValue;
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newValue = (newValue >> 8) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HH8_LDI_NEG:
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newValue = (((int) symbolValue + (int) addend));
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newValue = -newValue;
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newValue = (newValue >> 16) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_LO8_LDI_PM:
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newValue = (((int) symbolValue * 2 + (int) addend));
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HI8_LDI_PM:
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newValue = (((int) symbolValue * 2 + (int) addend));
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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newValue = (newValue >> 8) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HH8_LDI_PM:
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newValue = (((int) symbolValue * 2 + (int) addend));
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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newValue = (newValue >> 16) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_LO8_LDI_PM_NEG:
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newValue = (((int) symbolValue * 2 + (int) addend));
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newValue = -newValue;
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HI8_LDI_PM_NEG:
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newValue = (((int) symbolValue * 2 + (int) addend));
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newValue = -newValue;
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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newValue = (newValue >> 8) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_HH8_LDI_PM_NEG:
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newValue = (((int) symbolValue * 2 + (int) addend));
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newValue = -newValue;
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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newValue = (newValue >> 16) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_CALL:
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newValue = (int) symbolValue * 2 + (int) addend;
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if ((newValue & 1) == 1) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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return;
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}
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newValue >>= 1;
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int hiValue =
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oldValue | ((newValue & 0x10000) | ((newValue << 3) & 0x1f00000)) >> 16;
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memory.setShort(relocationAddress, (short) (hiValue & 0xffff));
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memory.setShort(relocationAddress.add(2), (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_LDI: /* data/eeprom */
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newValue = (((int) symbolValue + (int) addend));
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if ((newValue & 0xffff) > 255) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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}
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newValue = (newValue >> 8) & 0xff;
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newValue = (oldValue & 0xf0f0) | (newValue & 0xf) | ((newValue << 4) & 0xf00);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_6: /* data/eeprom **/
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newValue = (((int) symbolValue + (int) addend));
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if (((newValue & 0xffff) > 63) || (newValue < 0)) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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}
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newValue = (oldValue & 0xd3f8) | (newValue & 7) | ((newValue & (3 << 3)) << 7) |
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((newValue & (1 << 5)) << 8);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_6_ADIW:
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newValue = (((int) symbolValue + (int) addend));
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if (((newValue & 0xffff) > 63) || (newValue < 0)) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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}
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newValue = (oldValue & 0xff30) | (newValue & 0xF) | ((newValue & 0x30) << 2);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_DIFF8:
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case AVR8_ElfRelocationConstants.R_AVR_DIFF16:
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case AVR8_ElfRelocationConstants.R_AVR_DIFF32:
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// nothing to do
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break;
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case AVR8_ElfRelocationConstants.R_AVR_LDS_STS_16:
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newValue = (((int) symbolValue + (int) addend));
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if (((newValue & 0xffff) < 0x40) || (newValue & 0xFFFF) > 0xbf) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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}
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newValue = newValue & 0x7f;
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newValue = (oldValue & 0x0f) | ((newValue & 0x30) << 5) | ((newValue & 0x40) << 2);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_PORT6:
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newValue = (((int) symbolValue + (int) addend));
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if ((newValue & 0xffff) > 0x3f) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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}
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newValue = (oldValue & 0xf9f0) | ((newValue & 0x30) << 5) | (newValue & 0x0f);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_PORT5:
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newValue = (((int) symbolValue + (int) addend));
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if ((newValue & 0xffff) > 0x1f) {
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markAsError(program, relocationAddress, type, symbolName,
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"relocation out of range", elfRelocationContext.getLog());
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}
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newValue = (oldValue & 0xff07) | ((newValue & 0x1f) << 3);
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memory.setShort(relocationAddress, (short) (newValue & 0xffff));
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break;
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case AVR8_ElfRelocationConstants.R_AVR_MS8_LDI:
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case AVR8_ElfRelocationConstants.R_AVR_MS8_LDI_NEG:
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case AVR8_ElfRelocationConstants.R_AVR_LO8_LDI_GS:
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case AVR8_ElfRelocationConstants.R_AVR_HI8_LDI_GS:
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case AVR8_ElfRelocationConstants.R_AVR_8:
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case AVR8_ElfRelocationConstants.R_AVR_8_LO8:
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case AVR8_ElfRelocationConstants.R_AVR_8_HI8:
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case AVR8_ElfRelocationConstants.R_AVR_8_HLO8:
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default:
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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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