forked from OSchip/llvm-project
89 lines
3.3 KiB
C++
89 lines
3.3 KiB
C++
//===-- dfsan_platform.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 DataFlowSanitizer.
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//
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// Platform specific information for DFSan.
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//===----------------------------------------------------------------------===//
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#ifndef DFSAN_PLATFORM_H
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#define DFSAN_PLATFORM_H
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_platform.h"
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namespace __dfsan {
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using __sanitizer::uptr;
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// TODO: The memory mapping code to setup a 1:1 shadow is based on msan.
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// Consider refactoring these into a shared implementation.
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struct MappingDesc {
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uptr start;
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uptr end;
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enum Type { INVALID, APP, SHADOW, ORIGIN } type;
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const char *name;
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};
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#if SANITIZER_LINUX && SANITIZER_WORDSIZE == 64
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// All of the following configurations are supported.
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// ASLR disabled: main executable and DSOs at 0x555550000000
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// PIE and ASLR: main executable and DSOs at 0x7f0000000000
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// non-PIE: main executable below 0x100000000, DSOs at 0x7f0000000000
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// Heap at 0x700000000000.
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const MappingDesc kMemoryLayout[] = {
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{0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app-1"},
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{0x010000000000ULL, 0x100000000000ULL, MappingDesc::SHADOW, "shadow-2"},
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{0x100000000000ULL, 0x110000000000ULL, MappingDesc::INVALID, "invalid"},
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{0x110000000000ULL, 0x200000000000ULL, MappingDesc::ORIGIN, "origin-2"},
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{0x200000000000ULL, 0x300000000000ULL, MappingDesc::SHADOW, "shadow-3"},
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{0x300000000000ULL, 0x400000000000ULL, MappingDesc::ORIGIN, "origin-3"},
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{0x400000000000ULL, 0x500000000000ULL, MappingDesc::INVALID, "invalid"},
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{0x500000000000ULL, 0x510000000000ULL, MappingDesc::SHADOW, "shadow-1"},
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{0x510000000000ULL, 0x600000000000ULL, MappingDesc::APP, "app-2"},
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{0x600000000000ULL, 0x610000000000ULL, MappingDesc::ORIGIN, "origin-1"},
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{0x610000000000ULL, 0x700000000000ULL, MappingDesc::INVALID, "invalid"},
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{0x700000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app-3"}};
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# define MEM_TO_SHADOW(mem) (((uptr)(mem)) ^ 0x500000000000ULL)
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# define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x100000000000ULL)
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#else
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# error "Unsupported platform"
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#endif
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const uptr kMemoryLayoutSize = sizeof(kMemoryLayout) / sizeof(kMemoryLayout[0]);
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#define MEM_TO_ORIGIN(mem) (SHADOW_TO_ORIGIN(MEM_TO_SHADOW((mem))))
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#ifndef __clang__
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__attribute__((optimize("unroll-loops")))
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#endif
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inline bool
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addr_is_type(uptr addr, MappingDesc::Type mapping_type) {
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// It is critical for performance that this loop is unrolled (because then it is
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// simplified into just a few constant comparisons).
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#ifdef __clang__
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# pragma unroll
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#endif
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for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
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if (kMemoryLayout[i].type == mapping_type &&
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addr >= kMemoryLayout[i].start && addr < kMemoryLayout[i].end)
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return true;
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return false;
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}
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#define MEM_IS_APP(mem) addr_is_type((uptr)(mem), MappingDesc::APP)
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#define MEM_IS_SHADOW(mem) addr_is_type((uptr)(mem), MappingDesc::SHADOW)
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#define MEM_IS_ORIGIN(mem) addr_is_type((uptr)(mem), MappingDesc::ORIGIN)
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} // namespace __dfsan
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#endif
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