3d044f57d4
This is the same as 327248 except Arm defining _GLOBAL_OFFSET_TABLE_ to be the base of the .got section as some existing code is relying upon it. For most Targets the _GLOBAL_OFFSET_TABLE_ symbol is expected to be at the start of the .got.plt section so that _GLOBAL_OFFSET_TABLE_[0] = reserved value that is by convention the address of the dynamic section. Previously we had defined _GLOBAL_OFFSET_TABLE_ as either the start or end of the .got section with the intention that the .got.plt section would follow the .got. However this does not always hold with the current default section ordering so _GLOBAL_OFFSET_TABLE_[0] may not be consistent with the reserved first entry of the .got.plt. X86, X86_64 and AArch64 will use the .got.plt. Arm, Mips and Power use .got Fixes PR36555 Differential Revision: https://reviews.llvm.org/D44259 llvm-svn: 327823
77 lines
1.8 KiB
C++
77 lines
1.8 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 "Symbols.h"
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#include "Target.h"
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#include "lld/Common/ErrorHandler.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();
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void relocateOne(uint8_t *Loc, RelType Type, uint64_t Val) const override;
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RelExpr getRelExpr(RelType Type, const Symbol &S,
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const uint8_t *Loc) const override;
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};
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} // namespace
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PPC::PPC() {
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GotBaseSymOff = 0x8000;
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GotBaseSymInGotPlt = false;
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}
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RelExpr PPC::getRelExpr(RelType Type, const Symbol &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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case R_PPC_PLTREL24:
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return R_PLT_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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void PPC::relocateOne(uint8_t *Loc, RelType 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_HI:
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write16be(Loc, Val >> 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_PLTREL24:
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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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TargetInfo *elf::getPPCTargetInfo() {
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static PPC Target;
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return &Target;
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}
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