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571dd98ea4
When producing objects that are abi compliant we are marking neither the object file nor the assembly file correctly and thus generate warnings. We need to set the EF_CPIC flag in the ELF header when generating direct object. Note that the warning is only generated when compiling without PIC. When compiling with clang the warning will be suppressed by supplying: -Wa,-mno-shared -Wa,-call_nonpic Also the following directive should also be added: .option pic0 when compiling without PIC, This eliminates the need for supplying: -mno-shared -call_nonpic on the assembler command line. Patch by Douglas Gilmore git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184220 91177308-0d34-0410-b5e6-96231b3b80d8
94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
//===-- MipsELFStreamer.cpp - MipsELFStreamer ---------------------------===//
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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/MipsELFStreamer.h"
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#include "MipsSubtarget.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCELF.h"
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#include "llvm/MC/MCELFSymbolFlags.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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MCELFStreamer* createMipsELFStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter,
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bool RelaxAll, bool NoExecStack) {
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MipsELFStreamer *S = new MipsELFStreamer(Context, TAB, OS, Emitter,
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RelaxAll, NoExecStack);
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return S;
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}
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// For llc. Set a group of ELF header flags
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void
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MipsELFStreamer::emitELFHeaderFlagsCG(const MipsSubtarget &Subtarget) {
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if (hasRawTextSupport())
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return;
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// Update e_header flags
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MCAssembler& MCA = getAssembler();
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unsigned EFlags = MCA.getELFHeaderEFlags();
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// TODO: Need to add -mabicalls and -mno-abicalls flags.
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// Currently we assume that -mabicalls is the default.
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EFlags |= ELF::EF_MIPS_CPIC;
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if (Subtarget.inMips16Mode())
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EFlags |= ELF::EF_MIPS_ARCH_ASE_M16;
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else
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EFlags |= ELF::EF_MIPS_NOREORDER;
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// Architecture
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if (Subtarget.hasMips64r2())
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EFlags |= ELF::EF_MIPS_ARCH_64R2;
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else if (Subtarget.hasMips64())
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EFlags |= ELF::EF_MIPS_ARCH_64;
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else if (Subtarget.hasMips32r2())
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EFlags |= ELF::EF_MIPS_ARCH_32R2;
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else
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EFlags |= ELF::EF_MIPS_ARCH_32;
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if (Subtarget.inMicroMipsMode())
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EFlags |= ELF::EF_MIPS_MICROMIPS;
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// ABI
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if (Subtarget.isABI_O32())
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EFlags |= ELF::EF_MIPS_ABI_O32;
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// Relocation Model
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Reloc::Model RM = Subtarget.getRelocationModel();
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if (RM == Reloc::PIC_ || RM == Reloc::Default)
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EFlags |= ELF::EF_MIPS_PIC;
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else if (RM == Reloc::Static)
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; // Do nothing for Reloc::Static
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else
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llvm_unreachable("Unsupported relocation model for e_flags");
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MCA.setELFHeaderEFlags(EFlags);
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}
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// For llc. Set a symbol's STO flags
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void
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MipsELFStreamer::emitMipsSTOCG(const MipsSubtarget &Subtarget,
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MCSymbol *Sym,
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unsigned Val) {
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if (hasRawTextSupport())
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return;
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MCSymbolData &Data = getOrCreateSymbolData(Sym);
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// The "other" values are stored in the last 6 bits of the second byte
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// The traditional defines for STO values assume the full byte and thus
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// the shift to pack it.
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MCELF::setOther(Data, Val >> 2);
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}
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} // namespace llvm
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