fea4957177
This patch adds proper handling of -target-abi, as accepted by llvm-mc and llc. Lowering (codegen) for the hard-float ABIs will follow in a subsequent patch. However, this patch does add MC layer support for the hard float and RVE ABIs (emission of the appropriate ELF flags https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md#-file-header). ABI parsing must be shared between codegen and the MC layer, so we add computeTargetABI to RISCVUtils. A warning will be printed if an invalid or unrecognized ABI is given. Differential Revision: https://reviews.llvm.org/D59023 llvm-svn: 355771
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//===-- RISCVELFStreamer.cpp - RISCV ELF Target Streamer Methods ----------===//
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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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//
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// This file provides RISCV specific target streamer methods.
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//
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//===----------------------------------------------------------------------===//
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#include "RISCVELFStreamer.h"
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#include "MCTargetDesc/RISCVAsmBackend.h"
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#include "RISCVMCTargetDesc.h"
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#include "Utils/RISCVBaseInfo.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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using namespace llvm;
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// This part is for ELF object output.
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RISCVTargetELFStreamer::RISCVTargetELFStreamer(MCStreamer &S,
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const MCSubtargetInfo &STI)
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: RISCVTargetStreamer(S) {
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MCAssembler &MCA = getStreamer().getAssembler();
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const FeatureBitset &Features = STI.getFeatureBits();
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auto &MAB = static_cast<RISCVAsmBackend &>(MCA.getBackend());
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RISCVABI::ABI ABI = MAB.getTargetABI();
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assert(ABI != RISCVABI::ABI_Unknown && "Improperly initialised target ABI");
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unsigned EFlags = MCA.getELFHeaderEFlags();
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if (Features[RISCV::FeatureStdExtC])
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EFlags |= ELF::EF_RISCV_RVC;
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switch (ABI) {
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case RISCVABI::ABI_ILP32:
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case RISCVABI::ABI_LP64:
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break;
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case RISCVABI::ABI_ILP32F:
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case RISCVABI::ABI_LP64F:
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EFlags |= ELF::EF_RISCV_FLOAT_ABI_SINGLE;
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break;
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case RISCVABI::ABI_ILP32D:
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case RISCVABI::ABI_LP64D:
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EFlags |= ELF::EF_RISCV_FLOAT_ABI_DOUBLE;
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break;
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case RISCVABI::ABI_ILP32E:
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EFlags |= ELF::EF_RISCV_RVE;
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break;
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case RISCVABI::ABI_Unknown:
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llvm_unreachable("Improperly initialised target ABI");
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}
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MCA.setELFHeaderEFlags(EFlags);
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}
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MCELFStreamer &RISCVTargetELFStreamer::getStreamer() {
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return static_cast<MCELFStreamer &>(Streamer);
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}
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void RISCVTargetELFStreamer::emitDirectiveOptionPush() {}
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void RISCVTargetELFStreamer::emitDirectiveOptionPop() {}
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void RISCVTargetELFStreamer::emitDirectiveOptionRVC() {}
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void RISCVTargetELFStreamer::emitDirectiveOptionNoRVC() {}
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void RISCVTargetELFStreamer::emitDirectiveOptionRelax() {}
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void RISCVTargetELFStreamer::emitDirectiveOptionNoRelax() {}
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