| 1 | //===-- hwasan_globals.h ----------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file is a part of HWAddressSanitizer. |
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| 10 | // |
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| 11 | // Private Hwasan header. |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #ifndef HWASAN_GLOBALS_H |
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| 15 | #define HWASAN_GLOBALS_H |
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| 16 | |
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| 17 | #include <link.h> |
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| 18 | |
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| 19 | #include "sanitizer_common/sanitizer_array_ref.h" |
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| 20 | #include "sanitizer_common/sanitizer_common.h" |
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| 21 | #include "sanitizer_common/sanitizer_internal_defs.h" |
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| 22 | |
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| 23 | namespace __hwasan { |
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| 24 | // This object should only ever be casted over the global (i.e. not constructed) |
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| 25 | // in the ELF PT_NOTE in order for `addr()` to work correctly. |
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| 26 | struct hwasan_global { |
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| 27 | // The size of this global variable. Note that the size in the descriptor is |
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| 28 | // max 1 << 24. Larger globals have multiple descriptors. |
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| 29 | uptr size() const { return info & 0xffffff; } |
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| 30 | // The fully-relocated address of this global. |
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| 31 | uptr addr() const { return reinterpret_cast<uintptr_t>(this) + gv_relptr; } |
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| 32 | // The static tag of this global. |
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| 33 | u8 tag() const { return info >> 24; }; |
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| 34 | |
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| 35 | // The relative address between the start of the descriptor for the HWASan |
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| 36 | // global (in the PT_NOTE), and the fully relocated address of the global. |
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| 37 | s32 gv_relptr; |
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| 38 | u32 info; |
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| 39 | }; |
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| 40 | |
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| 41 | // Walk through the specific DSO (as specified by the base, phdr, and phnum), |
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| 42 | // and return the range of the [beginning, end) of the HWASan globals descriptor |
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| 43 | // array. |
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| 44 | ArrayRef<const hwasan_global> HwasanGlobalsFor(ElfW(Addr) base, |
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| 45 | const ElfW(Phdr) * phdr, |
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| 46 | ElfW(Half) phnum); |
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| 47 | |
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| 48 | } // namespace __hwasan |
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| 49 | |
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| 50 | #endif // HWASAN_GLOBALS_H |
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| 51 | |
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