2013-03-09 10:31:44 +01:00
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//===- lib/MC/MCELFStreamer.cpp - ELF Object Output -----------------------===//
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2010-08-16 20:57:57 +02:00
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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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//
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// This file assembles .s files and emits ELF .o object files.
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//
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//===----------------------------------------------------------------------===//
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2012-12-07 16:50:40 +01:00
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#include "llvm/MC/MCELFStreamer.h"
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2012-01-08 00:18:39 +01:00
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#include "llvm/ADT/SmallPtrSet.h"
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2013-04-10 18:52:15 +02:00
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#include "llvm/ADT/STLExtras.h"
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2012-01-08 00:18:39 +01:00
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#include "llvm/MC/MCAssembler.h"
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2010-08-16 20:57:57 +02:00
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#include "llvm/MC/MCCodeEmitter.h"
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2012-01-08 00:18:39 +01:00
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#include "llvm/MC/MCContext.h"
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2012-12-07 17:50:23 +01:00
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#include "llvm/MC/MCELF.h"
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2010-08-16 20:57:57 +02:00
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#include "llvm/MC/MCELFSymbolFlags.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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2012-01-08 00:18:39 +01:00
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#include "llvm/MC/MCObjectStreamer.h"
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2010-08-16 20:57:57 +02:00
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#include "llvm/MC/MCSection.h"
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2012-12-03 17:50:05 +01:00
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#include "llvm/MC/MCSectionELF.h"
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2010-08-16 20:57:57 +02:00
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#include "llvm/MC/MCSymbol.h"
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2010-11-01 15:28:48 +01:00
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#include "llvm/MC/MCValue.h"
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2010-08-16 20:57:57 +02:00
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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2012-10-15 17:43:14 +02:00
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2012-12-07 16:50:40 +01:00
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inline void MCELFStreamer::SetSection(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind) {
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SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
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}
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2012-01-08 00:18:39 +01:00
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2012-12-07 16:50:40 +01:00
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inline void MCELFStreamer::SetSectionData() {
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SetSection(".data",
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ELF::SHT_PROGBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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EmitCodeAlignment(4, 0);
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}
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2012-01-08 00:18:39 +01:00
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2012-12-07 16:50:40 +01:00
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inline void MCELFStreamer::SetSectionText() {
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SetSection(".text",
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ELF::SHT_PROGBITS,
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ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
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SectionKind::getText());
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EmitCodeAlignment(4, 0);
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}
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2012-01-08 00:18:39 +01:00
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2012-12-07 16:50:40 +01:00
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inline void MCELFStreamer::SetSectionBss() {
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SetSection(".bss",
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ELF::SHT_NOBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC,
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SectionKind::getBSS());
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EmitCodeAlignment(4, 0);
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}
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2012-01-08 00:18:39 +01:00
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2012-12-07 16:50:40 +01:00
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MCELFStreamer::~MCELFStreamer() {
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2012-01-08 00:18:39 +01:00
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}
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2013-01-14 20:04:57 +01:00
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void MCELFStreamer::InitToTextSection() {
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SetSectionText();
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}
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2010-09-15 23:48:40 +02:00
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void MCELFStreamer::InitSections() {
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// This emulates the same behavior of GNU as. This makes it easier
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// to compare the output as the major sections are in the same order.
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SetSectionText();
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SetSectionData();
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SetSectionBss();
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SetSectionText();
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}
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2010-08-16 20:57:57 +02:00
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void MCELFStreamer::EmitLabel(MCSymbol *Symbol) {
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2010-11-28 17:22:59 +01:00
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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2010-11-28 18:18:55 +01:00
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MCObjectStreamer::EmitLabel(Symbol);
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2010-09-25 07:42:19 +02:00
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2010-11-11 20:04:55 +01:00
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const MCSectionELF &Section =
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static_cast<const MCSectionELF&>(Symbol->getSection());
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2010-11-28 18:18:55 +01:00
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MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
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2011-01-23 05:43:11 +01:00
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if (Section.getFlags() & ELF::SHF_TLS)
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2011-02-28 22:45:04 +01:00
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MCELF::SetType(SD, ELF::STT_TLS);
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2010-08-16 20:57:57 +02:00
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}
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2012-12-16 05:00:45 +01:00
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void MCELFStreamer::EmitDebugLabel(MCSymbol *Symbol) {
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EmitLabel(Symbol);
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}
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2010-08-16 20:57:57 +02:00
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void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
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switch (Flag) {
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2010-11-05 23:08:08 +01:00
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case MCAF_SyntaxUnified: return; // no-op here.
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2011-07-27 02:38:12 +02:00
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case MCAF_Code16: return; // Change parsing mode; no-op here.
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case MCAF_Code32: return; // Change parsing mode; no-op here.
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case MCAF_Code64: return; // Change parsing mode; no-op here.
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2010-08-16 20:57:57 +02:00
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case MCAF_SubsectionsViaSymbols:
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getAssembler().setSubsectionsViaSymbols(true);
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return;
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}
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2012-02-07 06:05:23 +01:00
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llvm_unreachable("invalid assembler flag!");
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2010-08-16 20:57:57 +02:00
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}
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2013-04-17 23:18:16 +02:00
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void MCELFStreamer::ChangeSection(const MCSection *Section,
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const MCExpr *Subsection) {
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2012-12-20 20:05:53 +01:00
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MCSectionData *CurSection = getCurrentSectionData();
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if (CurSection && CurSection->isBundleLocked())
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report_fatal_error("Unterminated .bundle_lock when changing a section");
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2010-11-14 05:17:37 +01:00
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const MCSymbol *Grp = static_cast<const MCSectionELF *>(Section)->getGroup();
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if (Grp)
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getAssembler().getOrCreateSymbolData(*Grp);
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2013-04-17 23:18:16 +02:00
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this->MCObjectStreamer::ChangeSection(Section, Subsection);
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2010-11-14 05:17:37 +01:00
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}
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2010-11-01 15:28:48 +01:00
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void MCELFStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
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getAssembler().getOrCreateSymbolData(*Symbol);
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MCSymbolData &AliasSD = getAssembler().getOrCreateSymbolData(*Alias);
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AliasSD.setFlags(AliasSD.getFlags() | ELF_Other_Weakref);
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2010-11-15 17:33:49 +01:00
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const MCExpr *Value = MCSymbolRefExpr::Create(Symbol, getContext());
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2010-11-01 15:28:48 +01:00
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Alias->setVariableValue(Value);
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}
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2013-04-10 18:52:15 +02:00
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// When GNU as encounters more than one .type declaration for an object it seems
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// to use a mechanism similar to the one below to decide which type is actually
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// used in the object file. The greater of T1 and T2 is selected based on the
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// following ordering:
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// STT_NOTYPE < STT_OBJECT < STT_FUNC < STT_GNU_IFUNC < STT_TLS < anything else
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// If neither T1 < T2 nor T2 < T1 according to this ordering, use T2 (the user
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// provided type).
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static unsigned CombineSymbolTypes(unsigned T1, unsigned T2) {
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unsigned TypeOrdering[] = {ELF::STT_NOTYPE, ELF::STT_OBJECT, ELF::STT_FUNC,
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ELF::STT_GNU_IFUNC, ELF::STT_TLS};
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for (unsigned i = 0; i != array_lengthof(TypeOrdering); ++i) {
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if (T1 == TypeOrdering[i])
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return T2;
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if (T2 == TypeOrdering[i])
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return T1;
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}
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return T2;
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}
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2013-08-09 03:52:03 +02:00
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bool MCELFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
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MCSymbolAttr Attribute) {
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2010-08-16 20:57:57 +02:00
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// Indirect symbols are handled differently, to match how 'as' handles
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// them. This makes writing matching .o files easier.
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if (Attribute == MCSA_IndirectSymbol) {
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// Note that we intentionally cannot use the symbol data here; this is
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// important for matching the string table that 'as' generates.
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IndirectSymbolData ISD;
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ISD.Symbol = Symbol;
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ISD.SectionData = getCurrentSectionData();
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getAssembler().getIndirectSymbols().push_back(ISD);
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2013-08-09 03:52:03 +02:00
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return true;
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2010-08-16 20:57:57 +02:00
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}
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// Adding a symbol attribute always introduces the symbol, note that an
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// important side effect of calling getOrCreateSymbolData here is to register
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// the symbol with the assembler.
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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// The implementation of symbol attributes is designed to match 'as', but it
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// leaves much to desired. It doesn't really make sense to arbitrarily add and
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// remove flags, but 'as' allows this (in particular, see .desc).
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//
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// In the future it might be worth trying to make these operations more well
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// defined.
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switch (Attribute) {
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case MCSA_LazyReference:
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case MCSA_Reference:
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2010-11-19 19:39:33 +01:00
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case MCSA_SymbolResolver:
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2010-08-16 20:57:57 +02:00
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case MCSA_PrivateExtern:
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case MCSA_WeakDefinition:
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2010-08-16 21:15:06 +02:00
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case MCSA_WeakDefAutoPrivate:
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2010-08-16 20:57:57 +02:00
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case MCSA_Invalid:
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case MCSA_IndirectSymbol:
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2013-08-09 03:52:03 +02:00
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return false;
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2010-08-16 20:57:57 +02:00
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2012-09-14 01:11:31 +02:00
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case MCSA_NoDeadStrip:
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2010-11-14 02:34:31 +01:00
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case MCSA_ELF_TypeGnuUniqueObject:
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// Ignore for now.
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break;
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2010-08-16 20:57:57 +02:00
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case MCSA_Global:
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2011-02-28 22:45:04 +01:00
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MCELF::SetBinding(SD, ELF::STB_GLOBAL);
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2010-08-16 20:57:57 +02:00
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SD.setExternal(true);
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2010-09-21 02:24:38 +02:00
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BindingExplicitlySet.insert(Symbol);
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2010-08-16 20:57:57 +02:00
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break;
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2010-09-02 19:18:32 +02:00
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case MCSA_WeakReference:
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2010-08-16 20:57:57 +02:00
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case MCSA_Weak:
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2011-02-28 22:45:04 +01:00
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MCELF::SetBinding(SD, ELF::STB_WEAK);
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2010-10-06 18:47:31 +02:00
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SD.setExternal(true);
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2010-09-21 02:24:38 +02:00
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BindingExplicitlySet.insert(Symbol);
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_Local:
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2011-02-28 22:45:04 +01:00
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MCELF::SetBinding(SD, ELF::STB_LOCAL);
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2010-09-21 02:24:38 +02:00
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SD.setExternal(false);
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BindingExplicitlySet.insert(Symbol);
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_ELF_TypeFunction:
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2013-04-10 18:52:15 +02:00
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_FUNC));
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2010-08-16 20:57:57 +02:00
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break;
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2011-12-12 18:34:04 +01:00
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case MCSA_ELF_TypeIndFunction:
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2013-04-10 18:52:15 +02:00
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_GNU_IFUNC));
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2011-12-12 18:34:04 +01:00
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break;
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2010-08-16 20:57:57 +02:00
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case MCSA_ELF_TypeObject:
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2013-04-10 18:52:15 +02:00
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_OBJECT));
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_ELF_TypeTLS:
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2013-04-10 18:52:15 +02:00
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_TLS));
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_ELF_TypeCommon:
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2013-04-10 18:52:15 +02:00
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// TODO: Emit these as a common symbol.
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_OBJECT));
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_ELF_TypeNoType:
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2013-04-10 18:52:15 +02:00
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_NOTYPE));
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_Protected:
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2011-02-28 22:45:04 +01:00
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MCELF::SetVisibility(SD, ELF::STV_PROTECTED);
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_Hidden:
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2011-02-28 22:45:04 +01:00
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MCELF::SetVisibility(SD, ELF::STV_HIDDEN);
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2010-08-16 20:57:57 +02:00
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break;
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case MCSA_Internal:
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2011-02-28 22:45:04 +01:00
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MCELF::SetVisibility(SD, ELF::STV_INTERNAL);
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2010-08-16 20:57:57 +02:00
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break;
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}
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2013-08-09 03:52:03 +02:00
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return true;
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2010-08-16 20:57:57 +02:00
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}
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void MCELFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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2010-09-21 02:24:38 +02:00
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if (!BindingExplicitlySet.count(Symbol)) {
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2011-02-28 22:45:04 +01:00
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MCELF::SetBinding(SD, ELF::STB_GLOBAL);
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2010-09-21 02:24:38 +02:00
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SD.setExternal(true);
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}
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2011-02-28 22:45:04 +01:00
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MCELF::SetType(SD, ELF::STT_OBJECT);
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2010-11-14 22:11:16 +01:00
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2011-02-28 22:45:04 +01:00
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if (MCELF::GetBinding(SD) == ELF_STB_Local) {
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2010-08-16 20:57:57 +02:00
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const MCSection *Section = getAssembler().getContext().getELFSection(".bss",
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2011-11-15 17:46:22 +01:00
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ELF::SHT_NOBITS,
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ELF::SHF_WRITE |
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ELF::SHF_ALLOC,
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SectionKind::getBSS());
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2013-09-20 01:21:01 +02:00
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AssignSection(Symbol, Section);
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2010-09-22 19:43:04 +02:00
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2010-09-29 16:52:01 +02:00
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struct LocalCommon L = {&SD, Size, ByteAlignment};
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LocalCommons.push_back(L);
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2010-09-21 02:24:38 +02:00
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} else {
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SD.setCommon(Size, ByteAlignment);
|
2010-08-16 20:57:57 +02:00
|
|
|
}
|
|
|
|
|
2010-09-21 02:24:38 +02:00
|
|
|
SD.setSize(MCConstantExpr::Create(Size, getContext()));
|
2010-08-16 20:57:57 +02:00
|
|
|
}
|
|
|
|
|
2012-12-07 16:50:40 +01:00
|
|
|
void MCELFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
|
|
|
SD.setSize(Value);
|
|
|
|
}
|
|
|
|
|
2011-09-02 01:04:27 +02:00
|
|
|
void MCELFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
|
|
unsigned ByteAlignment) {
|
2010-12-16 04:12:17 +01:00
|
|
|
// FIXME: Should this be caught and done earlier?
|
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
|
2011-02-28 22:45:04 +01:00
|
|
|
MCELF::SetBinding(SD, ELF::STB_LOCAL);
|
2010-12-16 04:12:17 +01:00
|
|
|
SD.setExternal(false);
|
|
|
|
BindingExplicitlySet.insert(Symbol);
|
2011-09-02 01:04:27 +02:00
|
|
|
EmitCommonSymbol(Symbol, Size, ByteAlignment);
|
2010-12-16 04:12:17 +01:00
|
|
|
}
|
|
|
|
|
2013-07-02 17:49:13 +02:00
|
|
|
void MCELFStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size) {
|
2012-12-20 20:05:53 +01:00
|
|
|
if (getCurrentSectionData()->isBundleLocked())
|
|
|
|
report_fatal_error("Emitting values inside a locked bundle is forbidden");
|
2012-02-15 16:09:06 +01:00
|
|
|
fixSymbolsInTLSFixups(Value);
|
2013-07-02 17:49:13 +02:00
|
|
|
MCObjectStreamer::EmitValueImpl(Value, Size);
|
2012-02-15 16:09:06 +01:00
|
|
|
}
|
|
|
|
|
2012-12-20 20:05:53 +01:00
|
|
|
void MCELFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
|
|
|
|
int64_t Value,
|
|
|
|
unsigned ValueSize,
|
|
|
|
unsigned MaxBytesToEmit) {
|
|
|
|
if (getCurrentSectionData()->isBundleLocked())
|
|
|
|
report_fatal_error("Emitting values inside a locked bundle is forbidden");
|
|
|
|
MCObjectStreamer::EmitValueToAlignment(ByteAlignment, Value,
|
|
|
|
ValueSize, MaxBytesToEmit);
|
|
|
|
}
|
|
|
|
|
2013-10-29 02:06:17 +01:00
|
|
|
// Add a symbol for the file name of this module. They start after the
|
|
|
|
// null symbol and don't count as normal symbol, i.e. a non-STT_FILE symbol
|
|
|
|
// with the same name may appear.
|
2010-08-16 20:57:57 +02:00
|
|
|
void MCELFStreamer::EmitFileDirective(StringRef Filename) {
|
2013-10-29 02:06:17 +01:00
|
|
|
getAssembler().addFileName(Filename);
|
2010-08-16 20:57:57 +02:00
|
|
|
}
|
|
|
|
|
2013-10-16 03:05:45 +02:00
|
|
|
void MCELFStreamer::EmitIdent(StringRef IdentString) {
|
|
|
|
const MCSection *Comment = getAssembler().getContext().getELFSection(
|
|
|
|
".comment", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS,
|
|
|
|
SectionKind::getReadOnly(), 1, "");
|
|
|
|
PushSection();
|
|
|
|
SwitchSection(Comment);
|
|
|
|
if (!SeenIdent) {
|
|
|
|
EmitIntValue(0, 1);
|
|
|
|
SeenIdent = true;
|
|
|
|
}
|
|
|
|
EmitBytes(IdentString);
|
|
|
|
EmitIntValue(0, 1);
|
|
|
|
PopSection();
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::fixSymbolsInTLSFixups(const MCExpr *expr) {
|
2010-11-24 03:19:40 +01:00
|
|
|
switch (expr->getKind()) {
|
2013-01-31 13:12:40 +01:00
|
|
|
case MCExpr::Target:
|
|
|
|
cast<MCTargetExpr>(expr)->fixELFSymbolsInTLSFixups(getAssembler());
|
|
|
|
break;
|
2010-11-24 03:19:40 +01:00
|
|
|
case MCExpr::Constant:
|
|
|
|
break;
|
|
|
|
|
|
|
|
case MCExpr::Binary: {
|
|
|
|
const MCBinaryExpr *be = cast<MCBinaryExpr>(expr);
|
|
|
|
fixSymbolsInTLSFixups(be->getLHS());
|
|
|
|
fixSymbolsInTLSFixups(be->getRHS());
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MCExpr::SymbolRef: {
|
|
|
|
const MCSymbolRefExpr &symRef = *cast<MCSymbolRefExpr>(expr);
|
2010-11-24 19:51:21 +01:00
|
|
|
switch (symRef.getKind()) {
|
|
|
|
default:
|
2010-11-24 03:19:40 +01:00
|
|
|
return;
|
2011-03-17 01:35:10 +01:00
|
|
|
case MCSymbolRefExpr::VK_GOTTPOFF:
|
|
|
|
case MCSymbolRefExpr::VK_INDNTPOFF:
|
2010-11-24 19:51:21 +01:00
|
|
|
case MCSymbolRefExpr::VK_NTPOFF:
|
|
|
|
case MCSymbolRefExpr::VK_GOTNTPOFF:
|
|
|
|
case MCSymbolRefExpr::VK_TLSGD:
|
2011-03-17 01:35:10 +01:00
|
|
|
case MCSymbolRefExpr::VK_TLSLD:
|
2010-11-24 19:51:21 +01:00
|
|
|
case MCSymbolRefExpr::VK_TLSLDM:
|
|
|
|
case MCSymbolRefExpr::VK_TPOFF:
|
|
|
|
case MCSymbolRefExpr::VK_DTPOFF:
|
|
|
|
case MCSymbolRefExpr::VK_ARM_TLSGD:
|
2011-03-17 01:35:10 +01:00
|
|
|
case MCSymbolRefExpr::VK_ARM_TPOFF:
|
|
|
|
case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
|
2011-10-25 20:13:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_Mips_TLSGD:
|
|
|
|
case MCSymbolRefExpr::VK_Mips_GOTTPREL:
|
|
|
|
case MCSymbolRefExpr::VK_Mips_TPREL_HI:
|
|
|
|
case MCSymbolRefExpr::VK_Mips_TPREL_LO:
|
2013-07-02 01:33:29 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPMOD:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_LO:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HI:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HA:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
|
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
|
2013-02-26 17:41:03 +01:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TLS:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
|
[PowerPC] Revert r185476 and fix up TLS variant kinds
In the commit message to r185476 I wrote:
>The PowerPC-specific modifiers VK_PPC_TLSGD and VK_PPC_TLSLD
>correspond exactly to the generic modifiers VK_TLSGD and VK_TLSLD.
>This causes some confusion with the asm parser, since VK_PPC_TLSGD
>is output as @tlsgd, which is then read back in as VK_TLSGD.
>
>To avoid this confusion, this patch removes the PowerPC-specific
>modifiers and uses the generic modifiers throughout. (The only
>drawback is that the generic modifiers are printed in upper case
>while the usual convention on PowerPC is to use lower-case modifiers.
>But this is just a cosmetic issue.)
This was unfortunately incorrect, there is is fact another,
serious drawback to using the default VK_TLSLD/VK_TLSGD
variant kinds: using these causes ELFObjectWriter::RelocNeedsGOT
to return true, which in turn causes the ELFObjectWriter to emit
an undefined reference to _GLOBAL_OFFSET_TABLE_.
This is a problem on powerpc64, because it uses the TOC instead
of the GOT, and the linker does not provide _GLOBAL_OFFSET_TABLE_,
so the symbol remains undefined. This means shared libraries
using TLS built with the integrated assembler are currently
broken.
While the whole RelocNeedsGOT / _GLOBAL_OFFSET_TABLE_ situation
probably ought to be properly fixed at some point, for now I'm
simply reverting the r185476 commit. Now this in turn exposes
the breakage of handling @tlsgd/@tlsld in the asm parser that
this check-in was originally intended to fix.
To avoid this regression, I'm also adding a different fix for
this problem: while common code now parses @tlsgd as VK_TLSGD,
a special hack in the asm parser translates this code to the
platform-specific VK_PPC_TLSGD that the back-end now expects.
While this is not really pretty, it's self-contained and
shouldn't hurt anything else for now. One the underlying
problem is fixed, this hack can be reverted again.
llvm-svn: 185945
2013-07-09 18:41:09 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TLSGD:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
|
2013-06-21 16:44:15 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
|
2013-06-21 16:42:20 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
|
[PowerPC] Revert r185476 and fix up TLS variant kinds
In the commit message to r185476 I wrote:
>The PowerPC-specific modifiers VK_PPC_TLSGD and VK_PPC_TLSLD
>correspond exactly to the generic modifiers VK_TLSGD and VK_TLSLD.
>This causes some confusion with the asm parser, since VK_PPC_TLSGD
>is output as @tlsgd, which is then read back in as VK_TLSGD.
>
>To avoid this confusion, this patch removes the PowerPC-specific
>modifiers and uses the generic modifiers throughout. (The only
>drawback is that the generic modifiers are printed in upper case
>while the usual convention on PowerPC is to use lower-case modifiers.
>But this is just a cosmetic issue.)
This was unfortunately incorrect, there is is fact another,
serious drawback to using the default VK_TLSLD/VK_TLSGD
variant kinds: using these causes ELFObjectWriter::RelocNeedsGOT
to return true, which in turn causes the ELFObjectWriter to emit
an undefined reference to _GLOBAL_OFFSET_TABLE_.
This is a problem on powerpc64, because it uses the TOC instead
of the GOT, and the linker does not provide _GLOBAL_OFFSET_TABLE_,
so the symbol remains undefined. This means shared libraries
using TLS built with the integrated assembler are currently
broken.
While the whole RelocNeedsGOT / _GLOBAL_OFFSET_TABLE_ situation
probably ought to be properly fixed at some point, for now I'm
simply reverting the r185476 commit. Now this in turn exposes
the breakage of handling @tlsgd/@tlsld in the asm parser that
this check-in was originally intended to fix.
To avoid this regression, I'm also adding a different fix for
this problem: while common code now parses @tlsgd as VK_TLSGD,
a special hack in the asm parser translates this code to the
platform-specific VK_PPC_TLSGD that the back-end now expects.
While this is not really pretty, it's self-contained and
shouldn't hurt anything else for now. One the underlying
problem is fixed, this hack can be reverted again.
llvm-svn: 185945
2013-07-09 18:41:09 +02:00
|
|
|
case MCSymbolRefExpr::VK_PPC_TLSLD:
|
2010-11-24 19:51:21 +01:00
|
|
|
break;
|
|
|
|
}
|
2010-11-24 03:19:40 +01:00
|
|
|
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(symRef.getSymbol());
|
2011-02-28 22:45:04 +01:00
|
|
|
MCELF::SetType(SD, ELF::STT_TLS);
|
2010-11-24 03:19:40 +01:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
case MCExpr::Unary:
|
|
|
|
fixSymbolsInTLSFixups(cast<MCUnaryExpr>(expr)->getSubExpr());
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2010-08-27 12:40:51 +02:00
|
|
|
void MCELFStreamer::EmitInstToFragment(const MCInst &Inst) {
|
2010-12-02 06:44:06 +01:00
|
|
|
this->MCObjectStreamer::EmitInstToFragment(Inst);
|
2013-01-08 01:22:56 +01:00
|
|
|
MCRelaxableFragment &F = *cast<MCRelaxableFragment>(getCurrentFragment());
|
2010-08-16 20:57:57 +02:00
|
|
|
|
2010-12-02 06:44:06 +01:00
|
|
|
for (unsigned i = 0, e = F.getFixups().size(); i != e; ++i)
|
|
|
|
fixSymbolsInTLSFixups(F.getFixups()[i].getValue());
|
2010-08-27 12:40:51 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::EmitInstToData(const MCInst &Inst) {
|
2012-12-20 20:05:53 +01:00
|
|
|
MCAssembler &Assembler = getAssembler();
|
2010-08-16 20:57:57 +02:00
|
|
|
SmallVector<MCFixup, 4> Fixups;
|
|
|
|
SmallString<256> Code;
|
|
|
|
raw_svector_ostream VecOS(Code);
|
2012-12-20 20:05:53 +01:00
|
|
|
Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
|
2010-08-16 20:57:57 +02:00
|
|
|
VecOS.flush();
|
|
|
|
|
2010-11-24 03:19:40 +01:00
|
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
|
|
|
|
fixSymbolsInTLSFixups(Fixups[i].getValue());
|
|
|
|
|
2012-12-20 20:05:53 +01:00
|
|
|
// There are several possibilities here:
|
|
|
|
//
|
|
|
|
// If bundling is disabled, append the encoded instruction to the current data
|
|
|
|
// fragment (or create a new such fragment if the current fragment is not a
|
|
|
|
// data fragment).
|
|
|
|
//
|
|
|
|
// If bundling is enabled:
|
2013-01-16 00:22:09 +01:00
|
|
|
// - If we're not in a bundle-locked group, emit the instruction into a
|
|
|
|
// fragment of its own. If there are no fixups registered for the
|
|
|
|
// instruction, emit a MCCompactEncodedInstFragment. Otherwise, emit a
|
|
|
|
// MCDataFragment.
|
2012-12-20 20:05:53 +01:00
|
|
|
// - If we're in a bundle-locked group, append the instruction to the current
|
|
|
|
// data fragment because we want all the instructions in a group to get into
|
|
|
|
// the same fragment. Be careful not to do that for the first instruction in
|
|
|
|
// the group, though.
|
|
|
|
MCDataFragment *DF;
|
|
|
|
|
|
|
|
if (Assembler.isBundlingEnabled()) {
|
|
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
|
|
if (SD->isBundleLocked() && !SD->isBundleGroupBeforeFirstInst())
|
2013-02-15 23:50:52 +01:00
|
|
|
// If we are bundle-locked, we re-use the current fragment.
|
|
|
|
// The bundle-locking directive ensures this is a new data fragment.
|
|
|
|
DF = cast<MCDataFragment>(getCurrentFragment());
|
2013-01-16 00:22:09 +01:00
|
|
|
else if (!SD->isBundleLocked() && Fixups.size() == 0) {
|
|
|
|
// Optimize memory usage by emitting the instruction to a
|
|
|
|
// MCCompactEncodedInstFragment when not in a bundle-locked group and
|
|
|
|
// there are no fixups registered.
|
2013-04-17 23:18:16 +02:00
|
|
|
MCCompactEncodedInstFragment *CEIF = new MCCompactEncodedInstFragment();
|
|
|
|
insert(CEIF);
|
2013-01-16 00:22:09 +01:00
|
|
|
CEIF->getContents().append(Code.begin(), Code.end());
|
|
|
|
return;
|
2013-02-15 23:50:52 +01:00
|
|
|
} else {
|
2013-04-17 23:18:16 +02:00
|
|
|
DF = new MCDataFragment();
|
|
|
|
insert(DF);
|
2013-01-07 22:51:08 +01:00
|
|
|
if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
|
|
|
|
// If this is a new fragment created for a bundle-locked group, and the
|
|
|
|
// group was marked as "align_to_end", set a flag in the fragment.
|
|
|
|
DF->setAlignToBundleEnd(true);
|
|
|
|
}
|
|
|
|
}
|
2012-12-20 20:05:53 +01:00
|
|
|
|
|
|
|
// We're now emitting an instruction in a bundle group, so this flag has
|
|
|
|
// to be turned off.
|
|
|
|
SD->setBundleGroupBeforeFirstInst(false);
|
|
|
|
} else {
|
|
|
|
DF = getOrCreateDataFragment();
|
|
|
|
}
|
|
|
|
|
2010-08-27 12:40:51 +02:00
|
|
|
// Add the fixups and data.
|
2010-08-16 20:57:57 +02:00
|
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
|
2010-08-27 12:40:51 +02:00
|
|
|
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
|
2012-12-07 20:13:57 +01:00
|
|
|
DF->getFixups().push_back(Fixups[i]);
|
2010-08-16 20:57:57 +02:00
|
|
|
}
|
2012-12-20 20:05:53 +01:00
|
|
|
DF->setHasInstructions(true);
|
2010-08-27 12:40:51 +02:00
|
|
|
DF->getContents().append(Code.begin(), Code.end());
|
|
|
|
}
|
2010-08-16 20:57:57 +02:00
|
|
|
|
2012-12-20 20:05:53 +01:00
|
|
|
void MCELFStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
|
|
|
|
assert(AlignPow2 <= 30 && "Invalid bundle alignment");
|
|
|
|
MCAssembler &Assembler = getAssembler();
|
|
|
|
if (Assembler.getBundleAlignSize() == 0 && AlignPow2 > 0)
|
|
|
|
Assembler.setBundleAlignSize(1 << AlignPow2);
|
|
|
|
else
|
|
|
|
report_fatal_error(".bundle_align_mode should be only set once per file");
|
|
|
|
}
|
|
|
|
|
2013-01-07 22:51:08 +01:00
|
|
|
void MCELFStreamer::EmitBundleLock(bool AlignToEnd) {
|
2012-12-20 20:05:53 +01:00
|
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
|
|
|
|
|
|
// Sanity checks
|
|
|
|
//
|
|
|
|
if (!getAssembler().isBundlingEnabled())
|
|
|
|
report_fatal_error(".bundle_lock forbidden when bundling is disabled");
|
|
|
|
else if (SD->isBundleLocked())
|
|
|
|
report_fatal_error("Nesting of .bundle_lock is forbidden");
|
|
|
|
|
2013-01-07 22:51:08 +01:00
|
|
|
SD->setBundleLockState(AlignToEnd ? MCSectionData::BundleLockedAlignToEnd :
|
|
|
|
MCSectionData::BundleLocked);
|
2012-12-20 20:05:53 +01:00
|
|
|
SD->setBundleGroupBeforeFirstInst(true);
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::EmitBundleUnlock() {
|
|
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
|
|
|
|
|
|
// Sanity checks
|
|
|
|
if (!getAssembler().isBundlingEnabled())
|
|
|
|
report_fatal_error(".bundle_unlock forbidden when bundling is disabled");
|
|
|
|
else if (!SD->isBundleLocked())
|
|
|
|
report_fatal_error(".bundle_unlock without matching lock");
|
|
|
|
else if (SD->isBundleGroupBeforeFirstInst())
|
|
|
|
report_fatal_error("Empty bundle-locked group is forbidden");
|
|
|
|
|
2013-01-07 22:51:08 +01:00
|
|
|
SD->setBundleLockState(MCSectionData::NotBundleLocked);
|
2012-12-20 20:05:53 +01:00
|
|
|
}
|
|
|
|
|
2013-09-20 01:21:01 +02:00
|
|
|
void MCELFStreamer::Flush() {
|
2010-09-29 16:52:01 +02:00
|
|
|
for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
|
|
|
|
e = LocalCommons.end();
|
|
|
|
i != e; ++i) {
|
|
|
|
MCSymbolData *SD = i->SD;
|
|
|
|
uint64_t Size = i->Size;
|
|
|
|
unsigned ByteAlignment = i->ByteAlignment;
|
|
|
|
const MCSymbol &Symbol = SD->getSymbol();
|
|
|
|
const MCSection &Section = Symbol.getSection();
|
|
|
|
|
|
|
|
MCSectionData &SectData = getAssembler().getOrCreateSectionData(Section);
|
|
|
|
new MCAlignFragment(ByteAlignment, 0, 1, ByteAlignment, &SectData);
|
|
|
|
|
|
|
|
MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
|
|
|
|
SD->setFragment(F);
|
|
|
|
|
|
|
|
// Update the maximum alignment of the section if necessary.
|
|
|
|
if (ByteAlignment > SectData.getAlignment())
|
|
|
|
SectData.setAlignment(ByteAlignment);
|
|
|
|
}
|
|
|
|
|
2013-09-20 01:21:01 +02:00
|
|
|
LocalCommons.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::FinishImpl() {
|
|
|
|
EmitFrames(NULL, true);
|
|
|
|
|
|
|
|
Flush();
|
|
|
|
|
2012-01-07 04:13:18 +01:00
|
|
|
this->MCObjectStreamer::FinishImpl();
|
2010-08-16 20:57:57 +02:00
|
|
|
}
|
2013-09-20 01:21:01 +02:00
|
|
|
|
2013-10-08 15:08:17 +02:00
|
|
|
MCStreamer *llvm::createELFStreamer(MCContext &Context,
|
|
|
|
MCTargetStreamer *Streamer,
|
|
|
|
MCAsmBackend &MAB, raw_ostream &OS,
|
|
|
|
MCCodeEmitter *CE, bool RelaxAll,
|
|
|
|
bool NoExecStack) {
|
|
|
|
MCELFStreamer *S = new MCELFStreamer(Context, Streamer, MAB, OS, CE);
|
2010-08-16 20:57:57 +02:00
|
|
|
if (RelaxAll)
|
|
|
|
S->getAssembler().setRelaxAll(true);
|
2011-01-23 18:55:27 +01:00
|
|
|
if (NoExecStack)
|
|
|
|
S->getAssembler().setNoExecStack(true);
|
2010-08-16 20:57:57 +02:00
|
|
|
return S;
|
|
|
|
}
|
2012-12-07 16:50:40 +01:00
|
|
|
|
2012-12-07 17:50:23 +01:00
|
|
|
void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
|
|
|
|
llvm_unreachable("Generic ELF doesn't support this directive");
|
|
|
|
}
|
|
|
|
|
2013-02-19 22:57:35 +01:00
|
|
|
MCSymbolData &MCELFStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
|
|
|
|
return getAssembler().getOrCreateSymbolData(*Symbol);
|
|
|
|
}
|
|
|
|
|
2012-12-07 16:50:40 +01:00
|
|
|
void MCELFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
|
|
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
|
|
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
|
|
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::EmitCOFFSymbolType(int Type) {
|
|
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::EndCOFFSymbolDef() {
|
|
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
|
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCELFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
|
|
}
|