d52675e0a7
This patch enables lld to read AArch64 Build Attributes and convert them
into GNU Properties.
Changes:
- Parses AArch64 Build Attributes from input object files.
- Converts known attributes into corresponding GNU Properties.
- Merges attributes when linking multiple objects.
Spec reference:
https://github.com/ARM-software/abi-aa/pull/230/files#r1030
Co-authored-by: Sivan Shani <sivan.shani@arm.com>
---------
Co-authored-by: Sivan Shani <sivan.shani@arm.com>
49 lines
1.9 KiB
C++
49 lines
1.9 KiB
C++
//===-- AArch64AttributeParser.cpp - AArch64 Build Attributes PArser------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with
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// 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 "llvm/Support/AArch64AttributeParser.h"
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#include "llvm/Support/AArch64BuildAttributes.h"
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std::vector<llvm::SubsectionAndTagToTagName> &
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llvm::AArch64AttributeParser::returnTagsNamesMap() {
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static std::vector<SubsectionAndTagToTagName> TagsNamesMap = {
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{"aeabi_pauthabi", 1, "Tag_PAuth_Platform"},
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{"aeabi_pauthabi", 2, "Tag_PAuth_Schema"},
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{"aeabi_feature_and_bits", 0, "Tag_Feature_BTI"},
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{"aeabi_feature_and_bits", 1, "Tag_Feature_PAC"},
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{"aeabi_feature_and_bits", 2, "Tag_Feature_GCS"}};
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return TagsNamesMap;
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}
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llvm::AArch64BuildAttrSubsections llvm::extractBuildAttributesSubsections(
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const llvm::AArch64AttributeParser &Attributes) {
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llvm::AArch64BuildAttrSubsections SubSections;
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auto GetPauthValue = [&Attributes](unsigned Tag) {
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return Attributes.getAttributeValue("aeabi_pauthabi", Tag).value_or(0);
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};
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SubSections.Pauth.TagPlatform =
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GetPauthValue(llvm::AArch64BuildAttributes::TAG_PAUTH_PLATFORM);
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SubSections.Pauth.TagSchema =
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GetPauthValue(llvm::AArch64BuildAttributes::TAG_PAUTH_SCHEMA);
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auto GetFeatureValue = [&Attributes](unsigned Tag) {
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return Attributes.getAttributeValue("aeabi_feature_and_bits", Tag)
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.value_or(0);
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};
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SubSections.AndFeatures |=
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GetFeatureValue(llvm::AArch64BuildAttributes::TAG_FEATURE_BTI);
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SubSections.AndFeatures |=
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GetFeatureValue(llvm::AArch64BuildAttributes::TAG_FEATURE_PAC) << 1;
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SubSections.AndFeatures |=
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GetFeatureValue(llvm::AArch64BuildAttributes::TAG_FEATURE_GCS) << 2;
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return SubSections;
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}
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