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