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[DWARF] Refactor RelocVisitor and fix computation of SHT_RELA-typed relocation entries

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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
This commit is contained in:
Fangrui Song 2019-03-22 02:43:11 +00:00
parent 009a1e855b
commit 72e7abe0f8
8 changed files with 564 additions and 376 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/llvm/DebugInfo/DWARF/DWARFRelocMap.h
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@ -10,6 +10,7 @@
#define LLVM_DEBUGINFO_DWARF_DWARFRELOCMAP_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/Object/RelocationResolver.h"
#include <cstdint>
namespace llvm {
@ -18,7 +19,9 @@ namespace llvm {
/// Section index is -1LL if relocation points to absolute symbol.
struct RelocAddrEntry {
uint64_t SectionIndex;
uint64_t Value;
object::RelocationRef Reloc;
object::RelocationResolver Resolver;
uint64_t SymbolValue;
};
/// In place of applying the relocations to the data we've read from disk we use

362
include/llvm/Object/RelocVisitor.h
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@ -1,362 +0,0 @@
//===- RelocVisitor.h - Visitor for object file relocations -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides a wrapper around all the different types of relocations
// in different file formats, such that a client can handle them in a unified
// manner by only implementing a minimal number of functions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_RELOCVISITOR_H
#define LLVM_OBJECT_RELOCVISITOR_H
#include "llvm/ADT/Triple.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/Wasm.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstdint>
#include <system_error>
namespace llvm {
namespace object {
/// Base class for object file relocation visitors.
class RelocVisitor {
public:
explicit RelocVisitor(const ObjectFile &Obj) : ObjToVisit(Obj) {}
// TODO: Should handle multiple applied relocations via either passing in the
// previously computed value or just count paired relocations as a single
// visit.
uint64_t visit(uint32_t Rel, RelocationRef R, uint64_t Value = 0) {
if (isa<ELFObjectFileBase>(ObjToVisit))
return visitELF(Rel, R, Value);
if (isa<COFFObjectFile>(ObjToVisit))
return visitCOFF(Rel, R, Value);
if (isa<MachOObjectFile>(ObjToVisit))
return visitMachO(Rel, R, Value);
if (isa<WasmObjectFile>(ObjToVisit))
return visitWasm(Rel, R, Value);
HasError = true;
return 0;
}
bool error() { return HasError; }
private:
const ObjectFile &ObjToVisit;
bool HasError = false;
uint64_t visitELF(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (ObjToVisit.getBytesInAddress() == 8) { // 64-bit object file
switch (ObjToVisit.getArch()) {
case Triple::x86_64:
return visitX86_64(Rel, R, Value);
case Triple::aarch64:
case Triple::aarch64_be:
return visitAarch64(Rel, R, Value);
case Triple::bpfel:
case Triple::bpfeb:
return visitBpf(Rel, R, Value);
case Triple::mips64el:
case Triple::mips64:
return visitMips64(Rel, R, Value);
case Triple::ppc64le:
case Triple::ppc64:
return visitPPC64(Rel, R, Value);
case Triple::systemz:
return visitSystemz(Rel, R, Value);
case Triple::sparcv9:
return visitSparc64(Rel, R, Value);
case Triple::amdgcn:
return visitAmdgpu(Rel, R, Value);
default:
HasError = true;
return 0;
}
}
// 32-bit object file
assert(ObjToVisit.getBytesInAddress() == 4 &&
"Invalid word size in object file");
switch (ObjToVisit.getArch()) {
case Triple::x86:
return visitX86(Rel, R, Value);
case Triple::ppc:
return visitPPC32(Rel, R, Value);
case Triple::arm:
case Triple::armeb:
return visitARM(Rel, R, Value);
case Triple::avr:
return visitAVR(Rel, R, Value);
case Triple::lanai:
return visitLanai(Rel, R, Value);
case Triple::mipsel:
case Triple::mips:
return visitMips32(Rel, R, Value);
case Triple::sparc:
return visitSparc32(Rel, R, Value);
case Triple::hexagon:
return visitHexagon(Rel, R, Value);
default:
HasError = true;
return 0;
}
}
int64_t getELFAddend(RelocationRef R) {
Expected<int64_t> AddendOrErr = ELFRelocationRef(R).getAddend();
handleAllErrors(AddendOrErr.takeError(), [](const ErrorInfoBase &EI) {
report_fatal_error(EI.message());
});
return *AddendOrErr;
}
uint64_t visitX86_64(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_X86_64_NONE:
return 0;
case ELF::R_X86_64_64:
case ELF::R_X86_64_DTPOFF32:
case ELF::R_X86_64_DTPOFF64:
return Value + getELFAddend(R);
case ELF::R_X86_64_PC32:
return Value + getELFAddend(R) - R.getOffset();
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
return (Value + getELFAddend(R)) & 0xFFFFFFFF;
}
HasError = true;
return 0;
}
uint64_t visitAarch64(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_AARCH64_ABS32: {
int64_t Res = Value + getELFAddend(R);
if (Res < INT32_MIN || Res > UINT32_MAX)
HasError = true;
return static_cast<uint32_t>(Res);
}
case ELF::R_AARCH64_ABS64:
return Value + getELFAddend(R);
}
HasError = true;
return 0;
}
uint64_t visitBpf(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_BPF_64_32:
return Value & 0xFFFFFFFF;
case ELF::R_BPF_64_64:
return Value;
}
HasError = true;
return 0;
}
uint64_t visitMips64(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_MIPS_32:
return (Value + getELFAddend(R)) & 0xFFFFFFFF;
case ELF::R_MIPS_64:
return Value + getELFAddend(R);
case ELF::R_MIPS_TLS_DTPREL64:
return Value + getELFAddend(R) - 0x8000;
}
HasError = true;
return 0;
}
uint64_t visitPPC64(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_PPC64_ADDR32:
return (Value + getELFAddend(R)) & 0xFFFFFFFF;
case ELF::R_PPC64_ADDR64:
return Value + getELFAddend(R);
}
HasError = true;
return 0;
}
uint64_t visitSystemz(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_390_32: {
int64_t Res = Value + getELFAddend(R);
if (Res < INT32_MIN || Res > UINT32_MAX)
HasError = true;
return static_cast<uint32_t>(Res);
}
case ELF::R_390_64:
return Value + getELFAddend(R);
}
HasError = true;
return 0;
}
uint64_t visitSparc64(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_SPARC_32:
case ELF::R_SPARC_64:
case ELF::R_SPARC_UA32:
case ELF::R_SPARC_UA64:
return Value + getELFAddend(R);
}
HasError = true;
return 0;
}
uint64_t visitAmdgpu(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_AMDGPU_ABS32:
case ELF::R_AMDGPU_ABS64:
return Value + getELFAddend(R);
}
HasError = true;
return 0;
}
uint64_t visitX86(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (Rel) {
case ELF::R_386_NONE:
return 0;
case ELF::R_386_32:
return Value;
case ELF::R_386_PC32:
return Value - R.getOffset();
}
HasError = true;
return 0;
}
uint64_t visitPPC32(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (Rel == ELF::R_PPC_ADDR32)
return (Value + getELFAddend(R)) & 0xFFFFFFFF;
HasError = true;
return 0;
}
uint64_t visitARM(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (Rel == ELF::R_ARM_ABS32) {
if ((int64_t)Value < INT32_MIN || (int64_t)Value > UINT32_MAX)
HasError = true;
return static_cast<uint32_t>(Value);
}
HasError = true;
return 0;
}
uint64_t visitAVR(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (Rel == ELF::R_AVR_16) {
return (Value + getELFAddend(R)) & 0xFFFF;
} else if (Rel == ELF::R_AVR_32) {
return (Value + getELFAddend(R)) & 0xFFFFFFFF;
}
HasError = true;
return 0;
}
uint64_t visitLanai(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (Rel == ELF::R_LANAI_32)
return (Value + getELFAddend(R)) & 0xFFFFFFFF;
HasError = true;
return 0;
}
uint64_t visitMips32(uint32_t Rel, RelocationRef R, uint64_t Value) {
// FIXME: Take in account implicit addends to get correct results.
if (Rel == ELF::R_MIPS_32)
return Value & 0xFFFFFFFF;
if (Rel == ELF::R_MIPS_TLS_DTPREL32)
return Value & 0xFFFFFFFF;
HasError = true;
return 0;
}
uint64_t visitSparc32(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (Rel == ELF::R_SPARC_32 || Rel == ELF::R_SPARC_UA32)
return Value + getELFAddend(R);
HasError = true;
return 0;
}
uint64_t visitHexagon(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (Rel == ELF::R_HEX_32)
return Value + getELFAddend(R);
HasError = true;
return 0;
}
uint64_t visitCOFF(uint32_t Rel, RelocationRef R, uint64_t Value) {
switch (ObjToVisit.getArch()) {
case Triple::x86:
switch (Rel) {
case COFF::IMAGE_REL_I386_SECREL:
case COFF::IMAGE_REL_I386_DIR32:
return static_cast<uint32_t>(Value);
}
break;
case Triple::x86_64:
switch (Rel) {
case COFF::IMAGE_REL_AMD64_SECREL:
return static_cast<uint32_t>(Value);
case COFF::IMAGE_REL_AMD64_ADDR64:
return Value;
}
break;
default:
break;
}
HasError = true;
return 0;
}
uint64_t visitMachO(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (ObjToVisit.getArch() == Triple::x86_64 &&
Rel == MachO::X86_64_RELOC_UNSIGNED)
return Value;
HasError = true;
return 0;
}
uint64_t visitWasm(uint32_t Rel, RelocationRef R, uint64_t Value) {
if (ObjToVisit.getArch() == Triple::wasm32) {
switch (Rel) {
case wasm::R_WASM_FUNCTION_INDEX_LEB:
case wasm::R_WASM_TABLE_INDEX_SLEB:
case wasm::R_WASM_TABLE_INDEX_I32:
case wasm::R_WASM_MEMORY_ADDR_LEB:
case wasm::R_WASM_MEMORY_ADDR_SLEB:
case wasm::R_WASM_MEMORY_ADDR_I32:
case wasm::R_WASM_TYPE_INDEX_LEB:
case wasm::R_WASM_GLOBAL_INDEX_LEB:
case wasm::R_WASM_FUNCTION_OFFSET_I32:
case wasm::R_WASM_SECTION_OFFSET_I32:
case wasm::R_WASM_EVENT_INDEX_LEB:
// For wasm section, its offset at 0 -- ignoring Value
return 0;
}
}
HasError = true;
return 0;
}
};
} // end namespace object
} // end namespace llvm
#endif // LLVM_OBJECT_RELOCVISITOR_H

42
include/llvm/Object/RelocationResolver.h Normal file
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@ -0,0 +1,42 @@
//===- RelocVisitor.h - Visitor for object file relocations -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides a wrapper around all the different types of relocations
// in different file formats, such that a client can handle them in a unified
// manner by only implementing a minimal number of functions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_RELOCVISITOR_H
#define LLVM_OBJECT_RELOCVISITOR_H
#include "llvm/ADT/Triple.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/Wasm.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstdint>
#include <system_error>
namespace llvm {
namespace object {
using RelocationResolver = uint64_t (*)(RelocationRef R, uint64_t S, uint64_t A);
std::pair<bool (*)(uint64_t), RelocationResolver>
getRelocationResolver(const ObjectFile &Obj);
} // end namespace object
} // end namespace llvm
#endif // LLVM_OBJECT_RELOCVISITOR_H

20
lib/DebugInfo/DWARF/DWARFContext.cpp
View File

@ -36,7 +36,7 @@
#include "llvm/Object/Decompressor.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/RelocVisitor.h"
#include "llvm/Object/RelocationResolver.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Error.h"
@ -1500,6 +1500,9 @@ public:
// Symbol to [address, section index] cache mapping.
std::map<SymbolRef, SymInfo> AddrCache;
bool (*Supports)(uint64_t);
RelocationResolver Resolver;
std::tie(Supports, Resolver) = getRelocationResolver(Obj);
for (const RelocationRef &Reloc : Section.relocations()) {
// FIXME: it's not clear how to correctly handle scattered
// relocations.
@ -1514,9 +1517,15 @@ public:
continue;
}
object::RelocVisitor V(Obj);
uint64_t Val = V.visit(Reloc.getType(), Reloc, SymInfoOrErr->Address);
if (V.error()) {
// Check if Resolver can handle this relocation type early so as not to
// handle invalid cases in DWARFDataExtractor.
//
// TODO Don't store Resolver in every RelocAddrEntry.
if (Supports && Supports(Reloc.getType())) {
Map->try_emplace(Reloc.getOffset(),
RelocAddrEntry{SymInfoOrErr->SectionIndex, Reloc,
Resolver, SymInfoOrErr->Address});
} else {
SmallString<32> Type;
Reloc.getTypeName(Type);
ErrorPolicy EP = HandleError(
@ -1524,10 +1533,7 @@ public:
errorCodeToError(object_error::parse_failed)));
if (EP == ErrorPolicy::Halt)
return;
continue;
}
RelocAddrEntry Rel = {SymInfoOrErr->SectionIndex, Val};
Map->insert({Reloc.getOffset(), Rel});
}
}

11
lib/DebugInfo/DWARF/DWARFDataExtractor.cpp
View File

@ -18,12 +18,13 @@ uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint32_t *Off,
*SecNdx = object::SectionedAddress::UndefSection;
if (!Section)
return getUnsigned(Off, Size);
Optional<RelocAddrEntry> Rel = Obj->find(*Section, *Off);
if (!Rel)
return getUnsigned(Off, Size);
Optional<RelocAddrEntry> E = Obj->find(*Section, *Off);
uint64_t A = getUnsigned(Off, Size);
if (!E)
return A;
if (SecNdx)
*SecNdx = Rel->SectionIndex;
return getUnsigned(Off, Size) + Rel->Value;
*SecNdx = E->SectionIndex;
return E->Resolver(E->Reloc, E->SymbolValue, A);
}
Optional<uint64_t>

1
lib/Object/CMakeLists.txt
View File

@ -18,6 +18,7 @@ add_llvm_library(LLVMObject
Object.cpp
ObjectFile.cpp
RecordStreamer.cpp
RelocationResolver.cpp
SymbolicFile.cpp
SymbolSize.cpp
WasmObjectFile.cpp

497
lib/Object/RelocationResolver.cpp Normal file
View File

@ -0,0 +1,497 @@
//===- RelocationResolver.cpp ------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines utilities to resolve relocations in object files.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/RelocationResolver.h"
namespace llvm {
namespace object {
static int64_t getELFAddend(RelocationRef R) {
Expected<int64_t> AddendOrErr = ELFRelocationRef(R).getAddend();
handleAllErrors(AddendOrErr.takeError(), [](const ErrorInfoBase &EI) {
report_fatal_error(EI.message());
});
return *AddendOrErr;
}
static bool supportsX86_64(uint64_t Type) {
switch (Type) {
case ELF::R_X86_64_NONE:
case ELF::R_X86_64_64:
case ELF::R_X86_64_DTPOFF32:
case ELF::R_X86_64_DTPOFF64:
case ELF::R_X86_64_PC32:
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
return true;
default:
return false;
}
}
static uint64_t resolveX86_64(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_X86_64_NONE:
return A;
case ELF::R_X86_64_64:
case ELF::R_X86_64_DTPOFF32:
case ELF::R_X86_64_DTPOFF64:
return S + getELFAddend(R);
case ELF::R_X86_64_PC32:
return S + getELFAddend(R) - R.getOffset();
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S:
return (S + getELFAddend(R)) & 0xFFFFFFFF;
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsAArch64(uint64_t Type) {
switch (Type) {
case ELF::R_AARCH64_ABS32:
case ELF::R_AARCH64_ABS64:
return true;
default:
return false;
}
}
static uint64_t resolveAArch64(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_AARCH64_ABS32:
return (S + getELFAddend(R)) & 0xFFFFFFFF;
case ELF::R_AARCH64_ABS64:
return S + getELFAddend(R);
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsBPF(uint64_t Type) {
switch (Type) {
case ELF::R_BPF_64_32:
case ELF::R_BPF_64_64:
return true;
default:
return false;
}
}
static uint64_t resolveBPF(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_BPF_64_32:
return S & 0xFFFFFFFF;
case ELF::R_BPF_64_64:
return S;
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsMips64(uint64_t Type) {
switch (Type) {
case ELF::R_MIPS_32:
case ELF::R_MIPS_64:
case ELF::R_MIPS_TLS_DTPREL64:
return true;
default:
return false;
}
}
static uint64_t resolveMips64(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_MIPS_32:
return (S + getELFAddend(R)) & 0xFFFFFFFF;
case ELF::R_MIPS_64:
return S + getELFAddend(R);
case ELF::R_MIPS_TLS_DTPREL64:
return S + getELFAddend(R) - 0x8000;
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsPPC64(uint64_t Type) {
switch (Type) {
case ELF::R_PPC64_ADDR32:
case ELF::R_PPC64_ADDR64:
return true;
default:
return false;
}
}
static uint64_t resolvePPC64(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_PPC64_ADDR32:
return (S + getELFAddend(R)) & 0xFFFFFFFF;
case ELF::R_PPC64_ADDR64:
return S + getELFAddend(R);
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsSystemZ(uint64_t Type) {
switch (Type) {
case ELF::R_390_32:
case ELF::R_390_64:
return true;
default:
return false;
}
}
static uint64_t resolveSystemZ(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_390_32:
return (S + getELFAddend(R)) & 0xFFFFFFFF;
case ELF::R_390_64:
return S + getELFAddend(R);
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsSparc64(uint64_t Type) {
switch (Type) {
case ELF::R_SPARC_32:
case ELF::R_SPARC_64:
case ELF::R_SPARC_UA32:
case ELF::R_SPARC_UA64:
return true;
default:
return false;
}
}
static uint64_t resolveSparc64(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_SPARC_32:
case ELF::R_SPARC_64:
case ELF::R_SPARC_UA32:
case ELF::R_SPARC_UA64:
return S + getELFAddend(R);
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsAmdgpu(uint64_t Type) {
switch (Type) {
case ELF::R_AMDGPU_ABS32:
case ELF::R_AMDGPU_ABS64:
return true;
default:
return false;
}
}
static uint64_t resolveAmdgpu(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_AMDGPU_ABS32:
case ELF::R_AMDGPU_ABS64:
return S + getELFAddend(R);
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsX86(uint64_t Type) {
switch (Type) {
case ELF::R_386_NONE:
case ELF::R_386_32:
case ELF::R_386_PC32:
return true;
default:
return false;
}
}
static uint64_t resolveX86(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_386_NONE:
return A;
case ELF::R_386_32:
return S + A;
case ELF::R_386_PC32:
return S - R.getOffset() + A;
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsPPC32(uint64_t Type) {
return Type == ELF::R_PPC_ADDR32;
}
static uint64_t resolvePPC32(RelocationRef R, uint64_t S, uint64_t A) {
if (R.getType() == ELF::R_PPC_ADDR32)
return (S + getELFAddend(R)) & 0xFFFFFFFF;
llvm_unreachable("Invalid relocation type");
}
static bool supportsARM(uint64_t Type) {
return Type == ELF::R_ARM_ABS32;
}
static uint64_t resolveARM(RelocationRef R, uint64_t S, uint64_t A) {
if (R.getType() == ELF::R_ARM_ABS32)
return (S + A) & 0xFFFFFFFF;
llvm_unreachable("Invalid relocation type");
}
static bool supportsAVR(uint64_t Type) {
switch (Type) {
case ELF::R_AVR_16:
case ELF::R_AVR_32:
return true;
default:
return false;
}
}
static uint64_t resolveAVR(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case ELF::R_AVR_16:
return (S + getELFAddend(R)) & 0xFFFF;
case ELF::R_AVR_32:
return (S + getELFAddend(R)) & 0xFFFFFFFF;
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsLanai(uint64_t Type) {
return Type == ELF::R_LANAI_32;
}
static uint64_t resolveLanai(RelocationRef R, uint64_t S, uint64_t A) {
if (R.getType() == ELF::R_LANAI_32)
return (S + getELFAddend(R)) & 0xFFFFFFFF;
llvm_unreachable("Invalid relocation type");
}
static bool supportsMips32(uint64_t Type) {
switch (Type) {
case ELF::R_MIPS_32:
case ELF::R_MIPS_TLS_DTPREL32:
return true;
default:
return false;
}
}
static uint64_t resolveMips32(RelocationRef R, uint64_t S, uint64_t A) {
// FIXME: Take in account implicit addends to get correct results.
uint32_t Rel = R.getType();
if (Rel == ELF::R_MIPS_32)
return (S + A) & 0xFFFFFFFF;
if (Rel == ELF::R_MIPS_TLS_DTPREL32)
return (S + A) & 0xFFFFFFFF;
llvm_unreachable("Invalid relocation type");
}
static bool supportsSparc32(uint64_t Type) {
switch (Type) {
case ELF::R_SPARC_32:
case ELF::R_SPARC_UA32:
return true;
default:
return false;
}
}
static uint64_t resolveSparc32(RelocationRef R, uint64_t S, uint64_t A) {
uint32_t Rel = R.getType();
if (Rel == ELF::R_SPARC_32 || Rel == ELF::R_SPARC_UA32)
return S + getELFAddend(R);
return A;
}
static bool supportsHexagon(uint64_t Type) {
return Type == ELF::R_HEX_32;
}
static uint64_t resolveHexagon(RelocationRef R, uint64_t S, uint64_t A) {
if (R.getType() == ELF::R_HEX_32)
return S + getELFAddend(R);
llvm_unreachable("Invalid relocation type");
}
static bool supportsCOFFX86(uint64_t Type) {
switch (Type) {
case COFF::IMAGE_REL_I386_SECREL:
case COFF::IMAGE_REL_I386_DIR32:
return true;
default:
return false;
}
}
static uint64_t resolveCOFFX86(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case COFF::IMAGE_REL_I386_SECREL:
case COFF::IMAGE_REL_I386_DIR32:
return (S + A) & 0xFFFFFFFF;
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsCOFFX86_64(uint64_t Type) {
switch (Type) {
case COFF::IMAGE_REL_AMD64_SECREL:
case COFF::IMAGE_REL_AMD64_ADDR64:
return true;
default:
return false;
}
}
static uint64_t resolveCOFFX86_64(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case COFF::IMAGE_REL_AMD64_SECREL:
return (S + A) & 0xFFFFFFFF;
case COFF::IMAGE_REL_AMD64_ADDR64:
return S + A;
default:
llvm_unreachable("Invalid relocation type");
}
}
static bool supportsMachOX86_64(uint64_t Type) {
return Type == MachO::X86_64_RELOC_UNSIGNED;
}
static uint64_t resolveMachOX86_64(RelocationRef R, uint64_t S, uint64_t A) {
if (R.getType() == MachO::X86_64_RELOC_UNSIGNED)
return S;
llvm_unreachable("Invalid relocation type");
}
static bool supportsWasm32(uint64_t Type) {
switch (Type) {
case wasm::R_WASM_FUNCTION_INDEX_LEB:
case wasm::R_WASM_TABLE_INDEX_SLEB:
case wasm::R_WASM_TABLE_INDEX_I32:
case wasm::R_WASM_MEMORY_ADDR_LEB:
case wasm::R_WASM_MEMORY_ADDR_SLEB:
case wasm::R_WASM_MEMORY_ADDR_I32:
case wasm::R_WASM_TYPE_INDEX_LEB:
case wasm::R_WASM_GLOBAL_INDEX_LEB:
case wasm::R_WASM_FUNCTION_OFFSET_I32:
case wasm::R_WASM_SECTION_OFFSET_I32:
case wasm::R_WASM_EVENT_INDEX_LEB:
return true;
default:
return false;
}
}
static uint64_t resolveWasm32(RelocationRef R, uint64_t S, uint64_t A) {
switch (R.getType()) {
case wasm::R_WASM_FUNCTION_INDEX_LEB:
case wasm::R_WASM_TABLE_INDEX_SLEB:
case wasm::R_WASM_TABLE_INDEX_I32:
case wasm::R_WASM_MEMORY_ADDR_LEB:
case wasm::R_WASM_MEMORY_ADDR_SLEB:
case wasm::R_WASM_MEMORY_ADDR_I32:
case wasm::R_WASM_TYPE_INDEX_LEB:
case wasm::R_WASM_GLOBAL_INDEX_LEB:
case wasm::R_WASM_FUNCTION_OFFSET_I32:
case wasm::R_WASM_SECTION_OFFSET_I32:
case wasm::R_WASM_EVENT_INDEX_LEB:
// For wasm section, its offset at 0 -- ignoring Value
return A;
default:
llvm_unreachable("Invalid relocation type");
}
}
std::pair<bool (*)(uint64_t), RelocationResolver>
getRelocationResolver(const ObjectFile &Obj) {
if (Obj.isCOFF()) {
if (Obj.getBytesInAddress() == 8)
return {supportsCOFFX86_64, resolveCOFFX86_64};
return {supportsCOFFX86, resolveCOFFX86};
} else if (Obj.isELF()) {
if (Obj.getBytesInAddress() == 8) {
switch (Obj.getArch()) {
case Triple::x86_64:
return {supportsX86_64, resolveX86_64};
case Triple::aarch64:
case Triple::aarch64_be:
return {supportsAArch64, resolveAArch64};
case Triple::bpfel:
case Triple::bpfeb:
return {supportsBPF, resolveBPF};
case Triple::mips64el:
case Triple::mips64:
return {supportsMips64, resolveMips64};
case Triple::ppc64le:
case Triple::ppc64:
return {supportsPPC64, resolvePPC64};
case Triple::systemz:
return {supportsSystemZ, resolveSystemZ};
case Triple::sparcv9:
return {supportsSparc64, resolveSparc64};
case Triple::amdgcn:
return {supportsAmdgpu, resolveAmdgpu};
default:
return {nullptr, nullptr};
}
}
// 32-bit object file
assert(Obj.getBytesInAddress() == 4 &&
"Invalid word size in object file");
switch (Obj.getArch()) {
case Triple::x86:
return {supportsX86, resolveX86};
case Triple::ppc:
return {supportsPPC32, resolvePPC32};
case Triple::arm:
case Triple::armeb:
return {supportsARM, resolveARM};
case Triple::avr:
return {supportsAVR, resolveAVR};
case Triple::lanai:
return {supportsLanai, resolveLanai};
case Triple::mipsel:
case Triple::mips:
return {supportsMips32, resolveMips32};
case Triple::sparc:
return {supportsSparc32, resolveSparc32};
case Triple::hexagon:
return {supportsHexagon, resolveHexagon};
default:
return {nullptr, nullptr};
}
} else if (Obj.isMachO()) {
if (Obj.getArch() == Triple::x86_64)
return {supportsMachOX86_64, resolveMachOX86_64};
return {nullptr, nullptr};
} else if (Obj.isWasm()) {
if (Obj.getArch() == Triple::wasm32)
return {supportsWasm32, resolveWasm32};
return {nullptr, nullptr};
}
llvm_unreachable("Invalid object file");
}
} // namespace object
} // namespace llvm

2
test/Object/invalid.test
View File

@ -3,7 +3,7 @@ RUN: not llvm-objdump -s %p/Inputs/invalid-strtab-size.elf 2>&1 | FileCheck %s
RUN: not llvm-objdump -s %p/Inputs/invalid-strtab-zero-size.elf 2>&1 | FileCheck %s
CHECK: Invalid data was encountered while parsing the file
RUN: not llvm-dwarfdump %p/Inputs/invalid-bad-rel-type.elf 2>&1 | FileCheck --check-prefix=RELA %s
RUN: not llvm-dwarfdump -debug-line %p/Inputs/invalid-bad-rel-type.elf 2>&1 | FileCheck --check-prefix=RELA %s
RELA: Section is not SHT_RELA
RUN: not llvm-objdump -s %p/Inputs/invalid-strtab-non-null.elf 2>&1 | FileCheck --check-prefix=NON-NULL %s