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//===-- hwasan_globals.h ----------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file is a part of HWAddressSanitizer.
//
// Private Hwasan header.
//===----------------------------------------------------------------------===//
#ifndef HWASAN_GLOBALS_H
#define HWASAN_GLOBALS_H
#include <link.h>
#include "sanitizer_common/sanitizer_array_ref.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_internal_defs.h"
namespace __hwasan {
// This object should only ever be casted over the global (i.e. not constructed)
// in the ELF PT_NOTE in order for `addr()` to work correctly.
struct hwasan_global {
// The size of this global variable. Note that the size in the descriptor is
// max 1 << 24. Larger globals have multiple descriptors.
uptr size() const { return info & 0xffffff; }
// The fully-relocated address of this global.
uptr addr() const { return reinterpret_cast<uintptr_t>(this) + gv_relptr; }
// The static tag of this global.
u8 tag() const { return info >> 24; };
// The relative address between the start of the descriptor for the HWASan
// global (in the PT_NOTE), and the fully relocated address of the global.
s32 gv_relptr;
u32 info;
};
// Walk through the specific DSO (as specified by the base, phdr, and phnum),
// and return the range of the [beginning, end) of the HWASan globals descriptor
// array.
ArrayRef<const hwasan_global> HwasanGlobalsFor(ElfW(Addr) base,
const ElfW(Phdr) * phdr,
ElfW(Half) phnum);
} // namespace __hwasan
#endif // HWASAN_GLOBALS_H
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