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//===-- asan_mapping.h ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Defines ASan memory mapping.
//===----------------------------------------------------------------------===//
#ifndef ASAN_MAPPING_H
#define ASAN_MAPPING_H
#include "asan_internal.h"
// The full explanation of the memory mapping could be found here:
// http://code.google.com/p/address-sanitizer/wiki/AddressSanitizerAlgorithm
#if ASAN_FLEXIBLE_MAPPING_AND_OFFSET == 1
extern __attribute__((visibility("default"))) uintptr_t __asan_mapping_scale;
extern __attribute__((visibility("default"))) uintptr_t __asan_mapping_offset;
#define SHADOW_SCALE (__asan_mapping_scale)
#define SHADOW_OFFSET (__asan_mapping_offset)
#else
#define SHADOW_SCALE (3)
#if __WORDSIZE == 32
#define SHADOW_OFFSET (1 << 29)
#else
#define SHADOW_OFFSET (1ULL << 44)
#endif
#endif // ASAN_FLEXIBLE_MAPPING_AND_OFFSET
#define SHADOW_GRANULARITY (1ULL << SHADOW_SCALE)
#define MEM_TO_SHADOW(mem) (((mem) >> SHADOW_SCALE) | (SHADOW_OFFSET))
#if __WORDSIZE == 64
static const size_t kHighMemEnd = 0x00007fffffffffffUL;
#else // __WORDSIZE == 32
static const size_t kHighMemEnd = 0xffffffff;
#endif // __WORDSIZE
#define kLowMemBeg 0
#define kLowMemEnd (SHADOW_OFFSET ? SHADOW_OFFSET - 1 : 0)
#define kLowShadowBeg SHADOW_OFFSET
#define kLowShadowEnd MEM_TO_SHADOW(kLowMemEnd)
#define kHighMemBeg (MEM_TO_SHADOW(kHighMemEnd) + 1)
#define kHighShadowBeg MEM_TO_SHADOW(kHighMemBeg)
#define kHighShadowEnd MEM_TO_SHADOW(kHighMemEnd)
#define kShadowGapBeg (kLowShadowEnd ? kLowShadowEnd + 1 : 16 * kPageSize)
#define kShadowGapEnd (kHighShadowBeg - 1)
#define kGlobalAndStackRedzone \
(SHADOW_GRANULARITY < 32 ? 32 : SHADOW_GRANULARITY)
namespace __asan {
static inline bool AddrIsInLowMem(uintptr_t a) {
return a < kLowMemEnd;
}
static inline bool AddrIsInLowShadow(uintptr_t a) {
return a >= kLowShadowBeg && a <= kLowShadowEnd;
}
static inline bool AddrIsInHighMem(uintptr_t a) {
return a >= kHighMemBeg && a <= kHighMemEnd;
}
static inline bool AddrIsInMem(uintptr_t a) {
return AddrIsInLowMem(a) || AddrIsInHighMem(a);
}
static inline uintptr_t MemToShadow(uintptr_t p) {
CHECK(AddrIsInMem(p));
return MEM_TO_SHADOW(p);
}
static inline bool AddrIsInHighShadow(uintptr_t a) {
return a >= kHighShadowBeg && a <= kHighMemEnd;
}
static inline bool AddrIsInShadow(uintptr_t a) {
return AddrIsInLowShadow(a) || AddrIsInHighShadow(a);
}
static inline bool AddrIsAlignedByGranularity(uintptr_t a) {
return (a & (SHADOW_GRANULARITY - 1)) == 0;
}
} // namespace __asan
#endif // ASAN_MAPPING_H
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