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GP-3262: Mach-O PowerPC relocation framework
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Ryan Kurtz
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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.macho.relocation;
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/**
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* {@link PowerPC_MachoRelocationHandler} constants
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*
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* @see <a href="https://opensource.apple.com/source/xnu/xnu-1504.9.37/EXTERNAL_HEADERS/mach-o/ppc/reloc.h.auto.html">mach-o/ppc/reloc.h</a>
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*/
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public class PowerPC_MachoRelocationConstants {
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/**
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* Generic relocation as described above
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*/
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public final static int PPC_RELOC_VANILLA = 0;
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/**
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* The second relocation entry of a pair
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*/
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public final static int PPC_RELOC_PAIR = 1;
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/**
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* 14 bit branch displacement (to a word address)
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*/
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public final static int PPC_RELOC_BR14 = 2;
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/**
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* 24 bit branch displacement (to a word address)
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*/
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public final static int PPC_RELOC_BR24 = 3;
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/**
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* A {@link #PPC_RELOC_PAIR} follows with the low half
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*/
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public final static int PPC_RELOC_HI16 = 4;
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/**
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* A {@link #PPC_RELOC_PAIR} follows with the high half
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*/
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public final static int PPC_RELOC_LO16 = 5;
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/**
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* Same as the {@link #PPC_RELOC_HI16} except the low 16 bits and the high 16 bits are added
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* together with the low 16 bits sign-extended first. This means if bit 15 of the low 16 bits
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* is set the high 16 bits stored in the instruction will be adjusted.
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*/
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public final static int PPC_RELOC_HA16 = 6;
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/**
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* Same as the {@link #PPC_RELOC_LO16} except that the low 2 bits are not stored in the
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* instruction and are always zero. This is used in double word load/store instructions.
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*/
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public final static int PPC_RELOC_LO14 = 7;
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/**
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* A {@link #PPC_RELOC_PAIR} follows with subtract symbol value
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*/
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public final static int PPC_RELOC_SECTDIFF = 8;
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/**
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* Pre-bound lazy pointer
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*/
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public final static int PPC_RELOC_PB_LA_PTR = 9;
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/**
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* A section difference forms of above.
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* A {@link #PPC_RELOC_PAIR} Follows these with subtract symbol value.
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*/
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public final static int PPC_RELOC_HI16_SECTDIFF = 10;
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public final static int PPC_RELOC_LO16_SECTDIFF = 11;
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public final static int PPC_RELOC_HA16_SECTDIFF = 12;
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public final static int PPC_RELOC_JBSR = 13;
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public final static int PPC_RELOC_LO14_SECTDIFF = 14;
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/**
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* Like {@link #PPC_RELOC_SECTDIFF}, but the symbol referenced was local.
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*/
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public final static int PPC_RELOC_LOCAL_SECTDIFF = 15;
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}
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@@ -0,0 +1,89 @@
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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.macho.relocation;
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import static ghidra.app.util.bin.format.macho.relocation.PowerPC_MachoRelocationConstants.*;
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import ghidra.app.util.bin.format.RelocationException;
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import ghidra.app.util.bin.format.macho.*;
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import ghidra.program.model.mem.MemoryAccessException;
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import ghidra.program.model.reloc.RelocationResult;
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/**
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* A {@link MachoRelocationHandler} for PowerPC
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*
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* @see <a href="https://opensource.apple.com/source/xnu/xnu-1504.9.37/EXTERNAL_HEADERS/mach-o/ppc/reloc.h.auto.html">mach-o/ppc/reloc.h</a>
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*/
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public class PowerPC_MachoRelocationHandler extends MachoRelocationHandler {
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@Override
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public boolean canRelocate(MachHeader header) {
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return header.getCpuType() == CpuTypes.CPU_TYPE_POWERPC;
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}
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@Override
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public boolean isPairedRelocation(RelocationInfo relocation) {
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return switch (relocation.getType()) {
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case PPC_RELOC_HI16:
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case PPC_RELOC_LO16:
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case PPC_RELOC_HA16:
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case PPC_RELOC_LO14:
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case PPC_RELOC_SECTDIFF:
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case PPC_RELOC_HI16_SECTDIFF:
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case PPC_RELOC_LO16_SECTDIFF:
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case PPC_RELOC_HA16_SECTDIFF:
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case PPC_RELOC_JBSR:
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case PPC_RELOC_LO14_SECTDIFF:
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case PPC_RELOC_LOCAL_SECTDIFF: {
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yield true;
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}
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default:
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yield false;
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};
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}
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@Override
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public RelocationResult relocate(MachoRelocation relocation)
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throws MemoryAccessException, RelocationException {
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if (!relocation.requiresRelocation()) {
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return RelocationResult.SKIPPED;
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}
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RelocationInfo relocationInfo = relocation.getRelocationInfo();
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switch (relocationInfo.getType()) {
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case PPC_RELOC_VANILLA: // not seen yet
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case PPC_RELOC_PAIR: // not seen yet
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case PPC_RELOC_BR14: // not seen yet
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case PPC_RELOC_BR24: // not seen yet
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case PPC_RELOC_HI16: // not seen yet
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case PPC_RELOC_LO16: // not seen yet
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case PPC_RELOC_HA16: // not seen yet
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case PPC_RELOC_LO14: // not seen yet
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case PPC_RELOC_SECTDIFF: // not seen yet
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case PPC_RELOC_PB_LA_PTR: // not seen yet
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case PPC_RELOC_HI16_SECTDIFF: // not seen yet
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case PPC_RELOC_LO16_SECTDIFF: // not seen yet
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case PPC_RELOC_HA16_SECTDIFF: // not seen yet
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case PPC_RELOC_JBSR: // not seen yet
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case PPC_RELOC_LO14_SECTDIFF: // not seen yet
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case PPC_RELOC_LOCAL_SECTDIFF: // not seen yet
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default:
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return RelocationResult.UNSUPPORTED;
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}
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}
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}
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