489 lines
16 KiB
C++
489 lines
16 KiB
C++
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//===-- PPCELFObjectWriter.cpp - PPC ELF Writer ---------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "MCTargetDesc/PPCFixupKinds.h"
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#include "MCTargetDesc/PPCMCExpr.h"
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#include "MCTargetDesc/PPCMCTargetDesc.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/MCObjectWriter.h"
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#include "llvm/MC/MCSymbolELF.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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protected:
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unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
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const MCFixup &Fixup, bool IsPCRel) const override;
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bool needsRelocateWithSymbol(const MCSymbol &Sym,
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unsigned Type) 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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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_HIGH:
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return MCSymbolRefExpr::VK_PPC_HIGH;
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case PPCMCExpr::VK_PPC_HIGHA:
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return MCSymbolRefExpr::VK_PPC_HIGHA;
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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::getRelocType(MCContext &Ctx, const MCValue &Target,
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const MCFixup &Fixup,
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bool IsPCRel) const {
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MCFixupKind Kind = Fixup.getKind();
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if (Kind >= FirstLiteralRelocationKind)
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return Kind - FirstLiteralRelocationKind;
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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 (Fixup.getTargetKind()) {
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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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case PPC::fixup_ppc_br24_notoc:
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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_REL24;
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break;
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case MCSymbolRefExpr::VK_PLT:
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Type = ELF::R_PPC_PLTREL24;
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break;
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case MCSymbolRefExpr::VK_PPC_LOCAL:
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Type = ELF::R_PPC_LOCAL24PC;
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break;
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case MCSymbolRefExpr::VK_PPC_NOTOC:
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Type = ELF::R_PPC64_REL24_NOTOC;
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break;
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}
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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 PPC::fixup_ppc_half16ds:
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Target.print(errs());
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errs() << '\n';
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report_fatal_error("Invalid PC-relative half16ds relocation");
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case PPC::fixup_ppc_pcrel34:
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switch (Modifier) {
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default:
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llvm_unreachable("Unsupported Modifier for fixup_ppc_pcrel34");
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case MCSymbolRefExpr::VK_PCREL:
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Type = ELF::R_PPC64_PCREL34;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_PCREL:
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Type = ELF::R_PPC64_GOT_PCREL34;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_PCREL:
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Type = ELF::R_PPC64_GOT_TLSGD_PCREL34;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_PCREL:
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Type = ELF::R_PPC64_GOT_TLSLD_PCREL34;
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break;
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_PCREL:
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Type = ELF::R_PPC64_GOT_TPREL_PCREL34;
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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 (Fixup.getTargetKind()) {
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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_HIGH:
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Type = ELF::R_PPC64_ADDR16_HIGH;
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break;
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case MCSymbolRefExpr::VK_PPC_HIGHA:
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Type = ELF::R_PPC64_ADDR16_HIGHA;
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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_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_HIGH:
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Type = ELF::R_PPC64_TPREL16_HIGH;
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break;
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHA:
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Type = ELF::R_PPC64_TPREL16_HIGHA;
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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_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_HIGH:
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Type = ELF::R_PPC64_DTPREL16_HIGH;
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break;
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHA:
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Type = ELF::R_PPC64_DTPREL16_HIGHA;
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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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if (is64Bit())
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Type = ELF::R_PPC64_GOT_TLSGD16;
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else
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Type = ELF::R_PPC_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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if (is64Bit())
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Type = ELF::R_PPC64_GOT_TLSLD16;
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else
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Type = ELF::R_PPC_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;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
|
||
|
|
/* We don't have R_PPC64_GOT_TPREL16_LO, but since GOT offsets
|
||
|
|
are always 4-aligned, we can use R_PPC64_GOT_TPREL16_LO_DS. */
|
||
|
|
Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
|
||
|
|
Type = ELF::R_PPC64_GOT_TPREL16_HI;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
|
||
|
|
/* We don't have R_PPC64_GOT_DTPREL16, but since GOT offsets
|
||
|
|
are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_DS. */
|
||
|
|
Type = ELF::R_PPC64_GOT_DTPREL16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
|
||
|
|
/* We don't have R_PPC64_GOT_DTPREL16_LO, but since GOT offsets
|
||
|
|
are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_LO_DS. */
|
||
|
|
Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
|
||
|
|
Type = ELF::R_PPC64_GOT_TPREL16_HA;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
|
||
|
|
Type = ELF::R_PPC64_GOT_DTPREL16_HI;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
|
||
|
|
Type = ELF::R_PPC64_GOT_DTPREL16_HA;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case PPC::fixup_ppc_half16ds:
|
||
|
|
switch (Modifier) {
|
||
|
|
default: llvm_unreachable("Unsupported Modifier");
|
||
|
|
case MCSymbolRefExpr::VK_None:
|
||
|
|
Type = ELF::R_PPC64_ADDR16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_LO:
|
||
|
|
Type = ELF::R_PPC64_ADDR16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_GOT:
|
||
|
|
Type = ELF::R_PPC64_GOT16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_LO:
|
||
|
|
Type = ELF::R_PPC64_GOT16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TOC:
|
||
|
|
Type = ELF::R_PPC64_TOC16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TOC_LO:
|
||
|
|
Type = ELF::R_PPC64_TOC16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_TPREL:
|
||
|
|
Type = ELF::R_PPC64_TPREL16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_LO:
|
||
|
|
Type = ELF::R_PPC64_TPREL16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_DTPREL:
|
||
|
|
Type = ELF::R_PPC64_DTPREL16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
|
||
|
|
Type = ELF::R_PPC64_DTPREL16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
|
||
|
|
Type = ELF::R_PPC64_GOT_TPREL16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
|
||
|
|
Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
|
||
|
|
Type = ELF::R_PPC64_GOT_DTPREL16_DS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
|
||
|
|
Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case PPC::fixup_ppc_nofixup:
|
||
|
|
switch (Modifier) {
|
||
|
|
default: llvm_unreachable("Unsupported Modifier");
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TLSGD:
|
||
|
|
if (is64Bit())
|
||
|
|
Type = ELF::R_PPC64_TLSGD;
|
||
|
|
else
|
||
|
|
Type = ELF::R_PPC_TLSGD;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TLSLD:
|
||
|
|
if (is64Bit())
|
||
|
|
Type = ELF::R_PPC64_TLSLD;
|
||
|
|
else
|
||
|
|
Type = ELF::R_PPC_TLSLD;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TLS:
|
||
|
|
if (is64Bit())
|
||
|
|
Type = ELF::R_PPC64_TLS;
|
||
|
|
else
|
||
|
|
Type = ELF::R_PPC_TLS;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TLS_PCREL:
|
||
|
|
Type = ELF::R_PPC64_TLS;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case PPC::fixup_ppc_imm34:
|
||
|
|
switch (Modifier) {
|
||
|
|
default:
|
||
|
|
report_fatal_error("Unsupported Modifier for fixup_ppc_imm34.");
|
||
|
|
case MCSymbolRefExpr::VK_DTPREL:
|
||
|
|
Type = ELF::R_PPC64_DTPREL34;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_TPREL:
|
||
|
|
Type = ELF::R_PPC64_TPREL34;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case FK_Data_8:
|
||
|
|
switch (Modifier) {
|
||
|
|
default: llvm_unreachable("Unsupported Modifier");
|
||
|
|
case MCSymbolRefExpr::VK_PPC_TOCBASE:
|
||
|
|
Type = ELF::R_PPC64_TOC;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_None:
|
||
|
|
Type = ELF::R_PPC64_ADDR64;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_PPC_DTPMOD:
|
||
|
|
Type = ELF::R_PPC64_DTPMOD64;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_TPREL:
|
||
|
|
Type = ELF::R_PPC64_TPREL64;
|
||
|
|
break;
|
||
|
|
case MCSymbolRefExpr::VK_DTPREL:
|
||
|
|
Type = ELF::R_PPC64_DTPREL64;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case FK_Data_4:
|
||
|
|
Type = ELF::R_PPC_ADDR32;
|
||
|
|
break;
|
||
|
|
case FK_Data_2:
|
||
|
|
Type = ELF::R_PPC_ADDR16;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return Type;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool PPCELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
|
||
|
|
unsigned Type) const {
|
||
|
|
switch (Type) {
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
|
||
|
|
case ELF::R_PPC_REL24:
|
||
|
|
case ELF::R_PPC64_REL24_NOTOC:
|
||
|
|
// If the target symbol has a local entry point, we must keep the
|
||
|
|
// target symbol to preserve that information for the linker.
|
||
|
|
// The "other" values are stored in the last 6 bits of the second byte.
|
||
|
|
// The traditional defines for STO values assume the full byte and thus
|
||
|
|
// the shift to pack it.
|
||
|
|
unsigned Other = cast<MCSymbolELF>(Sym).getOther() << 2;
|
||
|
|
return (Other & ELF::STO_PPC64_LOCAL_MASK) != 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
std::unique_ptr<MCObjectTargetWriter>
|
||
|
|
llvm::createPPCELFObjectWriter(bool Is64Bit, uint8_t OSABI) {
|
||
|
|
return std::make_unique<PPCELFObjectWriter>(Is64Bit, OSABI);
|
||
|
|
}
|