mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-11-27 15:41:46 +00:00
1460942c15
This could probably have been part of D99633, but I split it up to make things a bit more reviewable. I also fixed some bugs in the implementation that were masked through integer underflows when operating in 64-bit mode. Reviewed By: #lld-macho, gkm Differential Revision: https://reviews.llvm.org/D99823
116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
//===- Relocations.h --------------------------------------------*- 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLD_MACHO_RELOCATIONS_H
|
|
#define LLD_MACHO_RELOCATIONS_H
|
|
|
|
#include "llvm/ADT/BitmaskEnum.h"
|
|
#include "llvm/ADT/PointerUnion.h"
|
|
#include "llvm/BinaryFormat/MachO.h"
|
|
#include "llvm/Support/Endian.h"
|
|
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
|
|
namespace lld {
|
|
namespace macho {
|
|
LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
|
|
|
|
class Symbol;
|
|
class InputSection;
|
|
|
|
enum class RelocAttrBits {
|
|
_0 = 0, // invalid
|
|
PCREL = 1 << 0, // Value is PC-relative offset
|
|
ABSOLUTE = 1 << 1, // Value is an absolute address or fixed offset
|
|
BYTE4 = 1 << 2, // 4 byte datum
|
|
BYTE8 = 1 << 3, // 8 byte datum
|
|
EXTERN = 1 << 4, // Can have an external symbol
|
|
LOCAL = 1 << 5, // Can have a local symbol
|
|
ADDEND = 1 << 6, // *_ADDEND paired prefix reloc
|
|
SUBTRAHEND = 1 << 7, // *_SUBTRACTOR paired prefix reloc
|
|
BRANCH = 1 << 8, // Value is branch target
|
|
GOT = 1 << 9, // References a symbol in the Global Offset Table
|
|
TLV = 1 << 10, // References a thread-local symbol
|
|
LOAD = 1 << 11, // Relaxable indirect load
|
|
POINTER = 1 << 12, // Non-relaxable indirect load (pointer is taken)
|
|
UNSIGNED = 1 << 13, // *_UNSIGNED relocs
|
|
LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue*/ (1 << 14) - 1),
|
|
};
|
|
// Note: SUBTRACTOR always pairs with UNSIGNED (a delta between two symbols).
|
|
|
|
struct RelocAttrs {
|
|
llvm::StringRef name;
|
|
RelocAttrBits bits;
|
|
bool hasAttr(RelocAttrBits b) const { return (bits & b) == b; }
|
|
};
|
|
|
|
struct Reloc {
|
|
uint8_t type = llvm::MachO::GENERIC_RELOC_INVALID;
|
|
bool pcrel = false;
|
|
uint8_t length = 0;
|
|
// The offset from the start of the subsection that this relocation belongs
|
|
// to.
|
|
uint64_t offset = 0;
|
|
// Adding this offset to the address of the referent symbol or subsection
|
|
// gives the destination that this relocation refers to.
|
|
int64_t addend = 0;
|
|
llvm::PointerUnion<Symbol *, InputSection *> referent = nullptr;
|
|
};
|
|
|
|
bool validateSymbolRelocation(const Symbol *, const InputSection *,
|
|
const Reloc &);
|
|
|
|
/*
|
|
* v: The value the relocation is attempting to encode
|
|
* bits: The number of bits actually available to encode this relocation
|
|
*/
|
|
void reportRangeError(const Reloc &, const llvm::Twine &v, uint8_t bits,
|
|
int64_t min, uint64_t max);
|
|
|
|
struct SymbolDiagnostic {
|
|
const Symbol *symbol;
|
|
llvm::StringRef reason;
|
|
};
|
|
|
|
void reportRangeError(SymbolDiagnostic, const llvm::Twine &v, uint8_t bits,
|
|
int64_t min, uint64_t max);
|
|
|
|
template <typename Diagnostic>
|
|
inline void checkInt(Diagnostic d, int64_t v, int bits) {
|
|
if (v != llvm::SignExtend64(v, bits))
|
|
reportRangeError(d, llvm::Twine(v), bits, llvm::minIntN(bits),
|
|
llvm::maxIntN(bits));
|
|
}
|
|
|
|
template <typename Diagnostic>
|
|
inline void checkUInt(Diagnostic d, uint64_t v, int bits) {
|
|
if ((v >> bits) != 0)
|
|
reportRangeError(d, llvm::Twine(v), bits, 0, llvm::maxUIntN(bits));
|
|
}
|
|
|
|
inline void writeAddress(uint8_t *loc, uint64_t addr, uint8_t length) {
|
|
switch (length) {
|
|
case 2:
|
|
llvm::support::endian::write32le(loc, addr);
|
|
break;
|
|
case 3:
|
|
llvm::support::endian::write64le(loc, addr);
|
|
break;
|
|
default:
|
|
llvm_unreachable("invalid r_length");
|
|
}
|
|
}
|
|
|
|
extern const RelocAttrs invalidRelocAttrs;
|
|
|
|
} // namespace macho
|
|
} // namespace lld
|
|
|
|
#endif
|