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https://github.com/c64scene-ar/llvm-6502.git
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930ca98433
The fix itself is fairly simple: move getAccessVariant to MCValue so that we replace the old weak expression evaluation with the far more general EvaluateAsRelocatable. This then requires that EvaluateAsRelocatable stop when it finds a non trivial reference kind. And that in turn requires the ELF writer to look harder for weak references. Last but not least, this found a case where we were being bug by bug compatible with gas and accepting an invalid input. I reported pr19647 to track it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207920 91177308-0d34-0410-b5e6-96231b3b80d8
389 lines
13 KiB
C++
389 lines
13 KiB
C++
//===-- PPCELFObjectWriter.cpp - PPC ELF Writer ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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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 "MCTargetDesc/PPCMCTargetDesc.h"
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#include "MCTargetDesc/PPCFixupKinds.h"
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#include "MCTargetDesc/PPCMCExpr.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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namespace {
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class PPCELFObjectWriter : public MCELFObjectTargetWriter {
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public:
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PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);
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virtual ~PPCELFObjectWriter();
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protected:
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virtual unsigned getRelocTypeInner(const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const;
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unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
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bool IsPCRel) const override;
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};
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}
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PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
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: MCELFObjectTargetWriter(Is64Bit, OSABI,
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Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
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/*HasRelocationAddend*/ true) {}
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PPCELFObjectWriter::~PPCELFObjectWriter() {
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}
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static MCSymbolRefExpr::VariantKind getAccessVariant(const MCValue &Target,
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const MCFixup &Fixup) {
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const MCExpr *Expr = Fixup.getValue();
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if (Expr->getKind() != MCExpr::Target)
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return Target.getAccessVariant();
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switch (cast<PPCMCExpr>(Expr)->getKind()) {
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case PPCMCExpr::VK_PPC_None:
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return MCSymbolRefExpr::VK_None;
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case PPCMCExpr::VK_PPC_LO:
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return MCSymbolRefExpr::VK_PPC_LO;
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case PPCMCExpr::VK_PPC_HI:
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return MCSymbolRefExpr::VK_PPC_HI;
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case PPCMCExpr::VK_PPC_HA:
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return MCSymbolRefExpr::VK_PPC_HA;
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case PPCMCExpr::VK_PPC_HIGHERA:
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return MCSymbolRefExpr::VK_PPC_HIGHERA;
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case PPCMCExpr::VK_PPC_HIGHER:
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return MCSymbolRefExpr::VK_PPC_HIGHER;
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case PPCMCExpr::VK_PPC_HIGHEST:
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return MCSymbolRefExpr::VK_PPC_HIGHEST;
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case PPCMCExpr::VK_PPC_HIGHESTA:
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return MCSymbolRefExpr::VK_PPC_HIGHESTA;
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}
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llvm_unreachable("unknown PPCMCExpr kind");
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}
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unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const
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{
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MCSymbolRefExpr::VariantKind Modifier = getAccessVariant(Target, Fixup);
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// determine the type of the relocation
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unsigned Type;
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if (IsPCRel) {
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switch ((unsigned)Fixup.getKind()) {
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default:
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llvm_unreachable("Unimplemented");
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case PPC::fixup_ppc_br24:
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case PPC::fixup_ppc_br24abs:
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Type = ELF::R_PPC_REL24;
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break;
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case PPC::fixup_ppc_brcond14:
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case PPC::fixup_ppc_brcond14abs:
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Type = ELF::R_PPC_REL14;
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break;
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case PPC::fixup_ppc_half16:
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switch (Modifier) {
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default: llvm_unreachable("Unsupported Modifier");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_PPC_REL16;
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break;
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case MCSymbolRefExpr::VK_PPC_LO:
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Type = ELF::R_PPC_REL16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_HI:
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Type = ELF::R_PPC_REL16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_HA:
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Type = ELF::R_PPC_REL16_HA;
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break;
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}
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break;
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case FK_Data_4:
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case FK_PCRel_4:
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Type = ELF::R_PPC_REL32;
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break;
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case FK_Data_8:
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case FK_PCRel_8:
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Type = ELF::R_PPC64_REL64;
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break;
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}
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} else {
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switch ((unsigned)Fixup.getKind()) {
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default: llvm_unreachable("invalid fixup kind!");
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case PPC::fixup_ppc_br24abs:
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Type = ELF::R_PPC_ADDR24;
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break;
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case PPC::fixup_ppc_brcond14abs:
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Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
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break;
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case PPC::fixup_ppc_half16:
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switch (Modifier) {
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default: llvm_unreachable("Unsupported Modifier");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_PPC_ADDR16;
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break;
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case MCSymbolRefExpr::VK_PPC_LO:
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Type = ELF::R_PPC_ADDR16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_HI:
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Type = ELF::R_PPC_ADDR16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_HA:
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Type = ELF::R_PPC_ADDR16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_HIGHER:
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Type = ELF::R_PPC64_ADDR16_HIGHER;
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break;
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case MCSymbolRefExpr::VK_PPC_HIGHERA:
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Type = ELF::R_PPC64_ADDR16_HIGHERA;
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break;
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case MCSymbolRefExpr::VK_PPC_HIGHEST:
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Type = ELF::R_PPC64_ADDR16_HIGHEST;
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break;
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case MCSymbolRefExpr::VK_PPC_HIGHESTA:
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Type = ELF::R_PPC64_ADDR16_HIGHESTA;
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break;
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case MCSymbolRefExpr::VK_GOT:
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Type = ELF::R_PPC_GOT16;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_LO:
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Type = ELF::R_PPC_GOT16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_HI:
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Type = ELF::R_PPC_GOT16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_HA:
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Type = ELF::R_PPC_GOT16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_TOC:
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Type = ELF::R_PPC64_TOC16;
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break;
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case MCSymbolRefExpr::VK_PPC_TOC_LO:
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Type = ELF::R_PPC64_TOC16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_TOC_HI:
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Type = ELF::R_PPC64_TOC16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_TOC_HA:
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Type = ELF::R_PPC64_TOC16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL:
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Type = ELF::R_PPC_TPREL16;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_LO:
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Type = ELF::R_PPC_TPREL16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_HI:
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Type = ELF::R_PPC_TPREL16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_HA:
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Type = ELF::R_PPC_TPREL16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
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Type = ELF::R_PPC64_TPREL16_HIGHER;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
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Type = ELF::R_PPC64_TPREL16_HIGHERA;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
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Type = ELF::R_PPC64_TPREL16_HIGHEST;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
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Type = ELF::R_PPC64_TPREL16_HIGHESTA;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL:
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Type = ELF::R_PPC64_DTPREL16;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
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Type = ELF::R_PPC64_DTPREL16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
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Type = ELF::R_PPC64_DTPREL16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
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Type = ELF::R_PPC64_DTPREL16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
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Type = ELF::R_PPC64_DTPREL16_HIGHER;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
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Type = ELF::R_PPC64_DTPREL16_HIGHERA;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
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Type = ELF::R_PPC64_DTPREL16_HIGHEST;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
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Type = ELF::R_PPC64_DTPREL16_HIGHESTA;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
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Type = ELF::R_PPC64_GOT_TLSGD16;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
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Type = ELF::R_PPC64_GOT_TLSGD16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
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Type = ELF::R_PPC64_GOT_TLSGD16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
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Type = ELF::R_PPC64_GOT_TLSGD16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
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Type = ELF::R_PPC64_GOT_TLSLD16;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
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Type = ELF::R_PPC64_GOT_TLSLD16_LO;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
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Type = ELF::R_PPC64_GOT_TLSLD16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
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Type = ELF::R_PPC64_GOT_TLSLD16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
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/* We don't have R_PPC64_GOT_TPREL16, but since GOT offsets
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are always 4-aligned, we can use R_PPC64_GOT_TPREL16_DS. */
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Type = ELF::R_PPC64_GOT_TPREL16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
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/* We don't have R_PPC64_GOT_TPREL16_LO, but since GOT offsets
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are always 4-aligned, we can use R_PPC64_GOT_TPREL16_LO_DS. */
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Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
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Type = ELF::R_PPC64_GOT_TPREL16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
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/* We don't have R_PPC64_GOT_DTPREL16, but since GOT offsets
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are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_DS. */
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Type = ELF::R_PPC64_GOT_DTPREL16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
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/* We don't have R_PPC64_GOT_DTPREL16_LO, but since GOT offsets
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are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_LO_DS. */
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Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
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Type = ELF::R_PPC64_GOT_TPREL16_HA;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
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Type = ELF::R_PPC64_GOT_DTPREL16_HI;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
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Type = ELF::R_PPC64_GOT_DTPREL16_HA;
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break;
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}
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break;
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case PPC::fixup_ppc_half16ds:
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switch (Modifier) {
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default: llvm_unreachable("Unsupported Modifier");
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_PPC64_ADDR16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_LO:
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Type = ELF::R_PPC64_ADDR16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_GOT:
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Type = ELF::R_PPC64_GOT16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_LO:
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Type = ELF::R_PPC64_GOT16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_TOC:
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Type = ELF::R_PPC64_TOC16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_TOC_LO:
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Type = ELF::R_PPC64_TOC16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL:
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Type = ELF::R_PPC64_TPREL16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_LO:
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Type = ELF::R_PPC64_TPREL16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL:
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Type = ELF::R_PPC64_DTPREL16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
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Type = ELF::R_PPC64_DTPREL16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
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Type = ELF::R_PPC64_GOT_TPREL16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
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Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
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Type = ELF::R_PPC64_GOT_DTPREL16_DS;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
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Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
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break;
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}
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break;
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case PPC::fixup_ppc_nofixup:
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switch (Modifier) {
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default: llvm_unreachable("Unsupported Modifier");
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case MCSymbolRefExpr::VK_PPC_TLSGD:
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Type = ELF::R_PPC64_TLSGD;
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break;
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case MCSymbolRefExpr::VK_PPC_TLSLD:
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Type = ELF::R_PPC64_TLSLD;
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break;
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case MCSymbolRefExpr::VK_PPC_TLS:
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Type = ELF::R_PPC64_TLS;
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break;
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}
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break;
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case FK_Data_8:
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switch (Modifier) {
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default: llvm_unreachable("Unsupported Modifier");
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case MCSymbolRefExpr::VK_PPC_TOCBASE:
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Type = ELF::R_PPC64_TOC;
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break;
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case MCSymbolRefExpr::VK_None:
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Type = ELF::R_PPC64_ADDR64;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPMOD:
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Type = ELF::R_PPC64_DTPMOD64;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL:
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Type = ELF::R_PPC64_TPREL64;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL:
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Type = ELF::R_PPC64_DTPREL64;
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break;
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}
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break;
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case FK_Data_4:
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Type = ELF::R_PPC_ADDR32;
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break;
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case FK_Data_2:
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Type = ELF::R_PPC_ADDR16;
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break;
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}
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}
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return Type;
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}
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unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const {
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return getRelocTypeInner(Target, Fixup, IsPCRel);
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}
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MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
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bool Is64Bit,
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bool IsLittleEndian,
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uint8_t OSABI) {
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MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
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return createELFObjectWriter(MOTW, OS, IsLittleEndian);
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}
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