113a59e7db
On many architectures gcc and clang will recognize _GLOBAL_OFFSET_TABLE_ - . and produce a relocation that can be processed without needing to know the value of _GLOBAL_OFFSET_TABLE_. This is not always the case; for example ARM gcc produces R_ARM_BASE_PREL but clang produces the more general R_ARM_REL32 to _GLOBAL_OFFSET_TABLE_. To evaluate this relocation correctly _GLOBAL_OFFSET_TABLE_ must be defined to be the either the base of the GOT or end of the GOT dependent on architecture.. If/when llvm-mc is changed to recognize _GLOBAL_OFFSET_TABLE_ - . this change will not be necessary for new objects. However there may still be old objects and versions of clang. Differential Revision: https://reviews.llvm.org/D34355 llvm-svn: 306282
66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
//===- PPC.cpp ------------------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Error.h"
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#include "Symbols.h"
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#include "Target.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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using namespace llvm::support::endian;
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using namespace llvm::ELF;
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using namespace lld;
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using namespace lld::elf;
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namespace {
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class PPC final : public TargetInfo {
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public:
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PPC() { GotBaseSymOff = 0x8000; }
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void relocateOne(uint8_t *Loc, uint32_t Type, uint64_t Val) const override;
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RelExpr getRelExpr(uint32_t Type, const SymbolBody &S,
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const uint8_t *Loc) const override;
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};
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} // namespace
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void PPC::relocateOne(uint8_t *Loc, uint32_t Type, uint64_t Val) const {
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switch (Type) {
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case R_PPC_ADDR16_HA:
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write16be(Loc, (Val + 0x8000) >> 16);
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break;
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case R_PPC_ADDR16_LO:
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write16be(Loc, Val);
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break;
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case R_PPC_ADDR32:
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case R_PPC_REL32:
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write32be(Loc, Val);
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break;
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case R_PPC_REL24:
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write32be(Loc, read32be(Loc) | (Val & 0x3FFFFFC));
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break;
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default:
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error(getErrorLocation(Loc) + "unrecognized reloc " + Twine(Type));
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}
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}
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RelExpr PPC::getRelExpr(uint32_t Type, const SymbolBody &S,
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const uint8_t *Loc) const {
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switch (Type) {
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case R_PPC_REL24:
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case R_PPC_REL32:
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return R_PC;
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default:
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return R_ABS;
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}
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}
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TargetInfo *elf::getPPCTargetInfo() {
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static PPC Target;
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return &Target;
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}
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