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72e7abe0f8
Summary:
getRelocatedValue may compute incorrect value for SHT_RELA-typed relocation entries.
// DWARFDataExtractor.cpp
uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint32_t *Off,
...
// This formula is correct for REL, but may be incorrect for RELA if the value
// stored in the location (getUnsigned(Off, Size)) is not zero.
return getUnsigned(Off, Size) + Rel->Value;
In this patch, we
* refactor these visit* functions to include a new parameter `uint64_t A`.
Since these visit* functions are no longer used as visitors, rename them to resolve*.
+ REL: A is used as the addend. A is the value stored in the location where the
relocation applies: getUnsigned(Off, Size)
+ RELA: The addend encoded in RelocationRef is used, e.g. getELFAddend(R)
* and add another set of supports* functions to check if a given relocation type is handled.
DWARFObjInMemory uses them to fail early.
Reviewers: echristo, dblaikie
Reviewed By: echristo
Subscribers: mgorny, aprantl, aheejin, fedor.sergeev, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D57939
llvm-svn: 356729
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
//===- RelocVisitor.h - Visitor for object file relocations -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides a wrapper around all the different types of relocations
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// in different file formats, such that a client can handle them in a unified
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// manner by only implementing a minimal number of functions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_RELOCVISITOR_H
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#define LLVM_OBJECT_RELOCVISITOR_H
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#include "llvm/ADT/Triple.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Object/Wasm.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cstdint>
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#include <system_error>
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namespace llvm {
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namespace object {
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using RelocationResolver = uint64_t (*)(RelocationRef R, uint64_t S, uint64_t A);
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std::pair<bool (*)(uint64_t), RelocationResolver>
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getRelocationResolver(const ObjectFile &Obj);
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} // end namespace object
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} // end namespace llvm
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#endif // LLVM_OBJECT_RELOCVISITOR_H
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