691ca556e0
RISC-V Zicfiss-based shadow stack needs to let the linker/loader know if the binary is built with the mechanism enabled to support proper link-time/load-time management of this feature. The information is encoded as a bit in the `.note.gnu.property` section. This patch implements emitting the section for RISC-V targets when Zicfiss-based shadow stack is enabled. When Clang receives the `-fcf-protection=return` flag, it adds the `hw-shadow-stack` attribute to LLVM functions, and adds a non-zero valued attribute named `cf-protection-return` to the LLVM module it generates. The backend depends on the `hw-shadow-stack` attributes to generate Zicfiss-based shadow stack instructions for each function, but at the module scope, the `cf-protection-return` attribute is a better indication of whether the translation unit is built with Zicfiss-based shadow stack enabled, so this patch emits the `.note.gnu.property` section with the "Zicfiss-based shadow stack" bit toggled on when it sees the `cf-protection-return` attribute.
100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
//===-- RISCVTargetStreamer.h - RISC-V Target Streamer ---------*- 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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#ifndef LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVTARGETSTREAMER_H
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#define LLVM_LIB_TARGET_RISCV_MCTARGETDESC_RISCVTARGETSTREAMER_H
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#include "RISCV.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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namespace llvm {
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class formatted_raw_ostream;
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enum class RISCVOptionArchArgType {
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Full,
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Plus,
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Minus,
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};
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struct RISCVOptionArchArg {
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RISCVOptionArchArgType Type;
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std::string Value;
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RISCVOptionArchArg(RISCVOptionArchArgType Type, std::string Value)
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: Type(Type), Value(Value) {}
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};
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class RISCVTargetStreamer : public MCTargetStreamer {
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RISCVABI::ABI TargetABI = RISCVABI::ABI_Unknown;
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bool HasRVC = false;
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bool HasTSO = false;
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public:
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RISCVTargetStreamer(MCStreamer &S);
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void finish() override;
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virtual void reset();
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virtual void emitDirectiveOptionArch(ArrayRef<RISCVOptionArchArg> Args);
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virtual void emitDirectiveOptionExact();
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virtual void emitDirectiveOptionNoExact();
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virtual void emitDirectiveOptionPIC();
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virtual void emitDirectiveOptionNoPIC();
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virtual void emitDirectiveOptionPop();
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virtual void emitDirectiveOptionPush();
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virtual void emitDirectiveOptionRelax();
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virtual void emitDirectiveOptionNoRelax();
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virtual void emitDirectiveOptionRVC();
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virtual void emitDirectiveOptionNoRVC();
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virtual void emitDirectiveVariantCC(MCSymbol &Symbol);
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virtual void emitAttribute(unsigned Attribute, unsigned Value);
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virtual void finishAttributeSection();
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virtual void emitTextAttribute(unsigned Attribute, StringRef String);
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virtual void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
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StringRef StringValue);
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void emitNoteGnuPropertySection(const uint32_t Feature1And);
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void emitTargetAttributes(const MCSubtargetInfo &STI, bool EmitStackAlign);
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void setTargetABI(RISCVABI::ABI ABI);
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RISCVABI::ABI getTargetABI() const { return TargetABI; }
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void setFlagsFromFeatures(const MCSubtargetInfo &STI);
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bool hasRVC() const { return HasRVC; }
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bool hasTSO() const { return HasTSO; }
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};
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// This part is for ascii assembly output
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class RISCVTargetAsmStreamer : public RISCVTargetStreamer {
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formatted_raw_ostream &OS;
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void finishAttributeSection() override;
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void emitAttribute(unsigned Attribute, unsigned Value) override;
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void emitTextAttribute(unsigned Attribute, StringRef String) override;
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void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
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StringRef StringValue) override;
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public:
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RISCVTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS);
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void emitDirectiveOptionArch(ArrayRef<RISCVOptionArchArg> Args) override;
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void emitDirectiveOptionExact() override;
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void emitDirectiveOptionNoExact() override;
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void emitDirectiveOptionPIC() override;
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void emitDirectiveOptionNoPIC() override;
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void emitDirectiveOptionPop() override;
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void emitDirectiveOptionPush() override;
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void emitDirectiveOptionRelax() override;
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void emitDirectiveOptionNoRelax() override;
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void emitDirectiveOptionRVC() override;
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void emitDirectiveOptionNoRVC() override;
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void emitDirectiveVariantCC(MCSymbol &Symbol) override;
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};
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}
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#endif
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