140 lines
3.6 KiB
C++
140 lines
3.6 KiB
C++
//===-- CSKYMCExpr.cpp - CSKY specific MC expression classes -*- C++ -*----===//
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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 "CSKYMCExpr.h"
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#include "CSKYFixupKinds.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbolELF.h"
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#include "llvm/Support/Casting.h"
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using namespace llvm;
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#define DEBUG_TYPE "csky-mc-expr"
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const CSKYMCExpr *CSKYMCExpr::create(const MCExpr *Expr, VariantKind Kind,
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MCContext &Ctx) {
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return new (Ctx) CSKYMCExpr(Kind, Expr);
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}
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StringRef CSKYMCExpr::getVariantKindName(VariantKind Kind) {
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switch (Kind) {
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default:
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llvm_unreachable("Invalid ELF symbol kind");
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case VK_CSKY_None:
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case VK_CSKY_ADDR:
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return "";
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case VK_CSKY_ADDR_HI16:
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return "@HI16";
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case VK_CSKY_ADDR_LO16:
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return "@LO16";
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case VK_CSKY_GOT_IMM18_BY4:
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case VK_CSKY_GOT:
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return "@GOT";
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case VK_CSKY_GOTPC:
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return "@GOTPC";
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case VK_CSKY_GOTOFF:
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return "@GOTOFF";
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case VK_CSKY_PLT_IMM18_BY4:
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case VK_CSKY_PLT:
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return "@PLT";
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case VK_CSKY_TLSLE:
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return "@TPOFF";
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case VK_CSKY_TLSIE:
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return "@GOTTPOFF";
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case VK_CSKY_TLSGD:
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return "@TLSGD32";
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case VK_CSKY_TLSLDO:
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return "@TLSLDO32";
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case VK_CSKY_TLSLDM:
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return "@TLSLDM32";
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}
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}
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void CSKYMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
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Streamer.visitUsedExpr(*getSubExpr());
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}
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void CSKYMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
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Expr->print(OS, MAI);
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OS << getVariantKindName(getKind());
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}
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static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
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switch (Expr->getKind()) {
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case MCExpr::Target:
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llvm_unreachable("Can't handle nested target expression");
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break;
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case MCExpr::Constant:
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break;
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case MCExpr::Binary: {
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const MCBinaryExpr *BE = cast<MCBinaryExpr>(Expr);
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fixELFSymbolsInTLSFixupsImpl(BE->getLHS(), Asm);
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fixELFSymbolsInTLSFixupsImpl(BE->getRHS(), Asm);
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break;
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}
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case MCExpr::SymbolRef: {
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// We're known to be under a TLS fixup, so any symbol should be
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// modified. There should be only one.
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const MCSymbolRefExpr &SymRef = *cast<MCSymbolRefExpr>(Expr);
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cast<MCSymbolELF>(SymRef.getSymbol()).setType(ELF::STT_TLS);
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break;
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}
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case MCExpr::Unary:
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fixELFSymbolsInTLSFixupsImpl(cast<MCUnaryExpr>(Expr)->getSubExpr(), Asm);
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break;
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}
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}
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void CSKYMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
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switch (getKind()) {
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default:
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return;
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case VK_CSKY_TLSLE:
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case VK_CSKY_TLSIE:
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case VK_CSKY_TLSGD:
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break;
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}
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fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
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}
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bool CSKYMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
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const MCAsmLayout *Layout,
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const MCFixup *Fixup) const {
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if (!getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup))
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return false;
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// Some custom fixup types are not valid with symbol difference expressions
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if (Res.getSymA() && Res.getSymB()) {
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switch (getKind()) {
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default:
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return true;
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case VK_CSKY_GOT:
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case VK_CSKY_GOT_IMM18_BY4:
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case VK_CSKY_GOTPC:
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case VK_CSKY_GOTOFF:
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case VK_CSKY_PLT:
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case VK_CSKY_PLT_IMM18_BY4:
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case VK_CSKY_TLSIE:
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case VK_CSKY_TLSLE:
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case VK_CSKY_TLSGD:
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case VK_CSKY_TLSLDO:
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case VK_CSKY_TLSLDM:
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return false;
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}
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}
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return true;
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}
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