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//===-- Header file of gnu_property_section -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_STARTUP_LINUX_GNU_PROPERTY_SECTION_H
#define LLVM_LIBC_STARTUP_LINUX_GNU_PROPERTY_SECTION_H
#include "hdr/elf_proxy.h"
#include "hdr/link_macros.h"
#include "src/__support/macros/attributes.h"
#include "src/__support/macros/config.h"
namespace LIBC_NAMESPACE_DECL {
struct GnuPropertyFeatures {
// Set if the binary was compiled with SHSTK enabled and declares support.
bool shstk_supported = false;
};
// This class parses the .note.gnu.property section within the ELF binary.
// Currently it only extracts the bit representing SHSTK support but can easily
// be expanded to other features included in it.
// The layout of the .note.gnu.property section and the program property is
// described in "System V Application Binary Interface - Linux Extensions"
// (https://github.com/hjl-tools/linux-abi/wiki).
class GnuPropertySection {
private:
[[maybe_unused]] GnuPropertyFeatures features_;
public:
LIBC_INLINE GnuPropertySection() = default;
bool parse(const ElfW(Phdr) * gnu_property_phdr, const ElfW(Addr) base);
LIBC_INLINE bool is_shstk_supported() const {
return features_.shstk_supported;
}
};
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_STARTUP_LINUX_GNU_PROPERTY_SECTION_H
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