diff --git a/compiler-rt/lib/asan/asan_mapping.h b/compiler-rt/lib/asan/asan_mapping.h
--- a/compiler-rt/lib/asan/asan_mapping.h
+++ b/compiler-rt/lib/asan/asan_mapping.h
@@ -14,216 +14,25 @@
 #define ASAN_MAPPING_H
 
 #include "asan_internal.h"
-
-// The full explanation of the memory mapping could be found here:
-// https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm
-//
-// Typical shadow mapping on Linux/x86_64 with SHADOW_OFFSET == 0x00007fff8000:
-// || `[0x10007fff8000, 0x7fffffffffff]` || HighMem    ||
-// || `[0x02008fff7000, 0x10007fff7fff]` || HighShadow ||
-// || `[0x00008fff7000, 0x02008fff6fff]` || ShadowGap  ||
-// || `[0x00007fff8000, 0x00008fff6fff]` || LowShadow  ||
-// || `[0x000000000000, 0x00007fff7fff]` || LowMem     ||
-//
-// When SHADOW_OFFSET is zero (-pie):
-// || `[0x100000000000, 0x7fffffffffff]` || HighMem    ||
-// || `[0x020000000000, 0x0fffffffffff]` || HighShadow ||
-// || `[0x000000040000, 0x01ffffffffff]` || ShadowGap  ||
-//
-// Special case when something is already mapped between
-// 0x003000000000 and 0x005000000000 (e.g. when prelink is installed):
-// || `[0x10007fff8000, 0x7fffffffffff]` || HighMem    ||
-// || `[0x02008fff7000, 0x10007fff7fff]` || HighShadow ||
-// || `[0x005000000000, 0x02008fff6fff]` || ShadowGap3 ||
-// || `[0x003000000000, 0x004fffffffff]` || MidMem     ||
-// || `[0x000a7fff8000, 0x002fffffffff]` || ShadowGap2 ||
-// || `[0x00067fff8000, 0x000a7fff7fff]` || MidShadow  ||
-// || `[0x00008fff7000, 0x00067fff7fff]` || ShadowGap  ||
-// || `[0x00007fff8000, 0x00008fff6fff]` || LowShadow  ||
-// || `[0x000000000000, 0x00007fff7fff]` || LowMem     ||
-//
-// Default Linux/i386 mapping on x86_64 machine:
-// || `[0x40000000, 0xffffffff]` || HighMem    ||
-// || `[0x28000000, 0x3fffffff]` || HighShadow ||
-// || `[0x24000000, 0x27ffffff]` || ShadowGap  ||
-// || `[0x20000000, 0x23ffffff]` || LowShadow  ||
-// || `[0x00000000, 0x1fffffff]` || LowMem     ||
-//
-// Default Linux/i386 mapping on i386 machine
-// (addresses starting with 0xc0000000 are reserved
-// for kernel and thus not sanitized):
-// || `[0x38000000, 0xbfffffff]` || HighMem    ||
-// || `[0x27000000, 0x37ffffff]` || HighShadow ||
-// || `[0x24000000, 0x26ffffff]` || ShadowGap  ||
-// || `[0x20000000, 0x23ffffff]` || LowShadow  ||
-// || `[0x00000000, 0x1fffffff]` || LowMem     ||
-//
-// Default Linux/MIPS32 mapping:
-// || `[0x2aaa0000, 0xffffffff]` || HighMem    ||
-// || `[0x0fff4000, 0x2aa9ffff]` || HighShadow ||
-// || `[0x0bff4000, 0x0fff3fff]` || ShadowGap  ||
-// || `[0x0aaa0000, 0x0bff3fff]` || LowShadow  ||
-// || `[0x00000000, 0x0aa9ffff]` || LowMem     ||
-//
-// Default Linux/MIPS64 mapping:
-// || `[0x4000000000, 0xffffffffff]` || HighMem    ||
-// || `[0x2800000000, 0x3fffffffff]` || HighShadow ||
-// || `[0x2400000000, 0x27ffffffff]` || ShadowGap  ||
-// || `[0x2000000000, 0x23ffffffff]` || LowShadow  ||
-// || `[0x0000000000, 0x1fffffffff]` || LowMem     ||
-//
-// Default Linux/RISCV64 Sv39 mapping:
-// || `[0x1555550000, 0x3fffffffff]` || HighMem    ||
-// || `[0x0fffffa000, 0x1555555fff]` || HighShadow ||
-// || `[0x0effffa000, 0x0fffff9fff]` || ShadowGap  ||
-// || `[0x0d55550000, 0x0effff9fff]` || LowShadow  ||
-// || `[0x0000000000, 0x0d5554ffff]` || LowMem     ||
-//
-// Default Linux/AArch64 (39-bit VMA) mapping:
-// || `[0x2000000000, 0x7fffffffff]` || highmem    ||
-// || `[0x1400000000, 0x1fffffffff]` || highshadow ||
-// || `[0x1200000000, 0x13ffffffff]` || shadowgap  ||
-// || `[0x1000000000, 0x11ffffffff]` || lowshadow  ||
-// || `[0x0000000000, 0x0fffffffff]` || lowmem     ||
-//
-// Default Linux/AArch64 (42-bit VMA) mapping:
-// || `[0x10000000000, 0x3ffffffffff]` || highmem    ||
-// || `[0x0a000000000, 0x0ffffffffff]` || highshadow ||
-// || `[0x09000000000, 0x09fffffffff]` || shadowgap  ||
-// || `[0x08000000000, 0x08fffffffff]` || lowshadow  ||
-// || `[0x00000000000, 0x07fffffffff]` || lowmem     ||
-//
-// Default Linux/S390 mapping:
-// || `[0x30000000, 0x7fffffff]` || HighMem    ||
-// || `[0x26000000, 0x2fffffff]` || HighShadow ||
-// || `[0x24000000, 0x25ffffff]` || ShadowGap  ||
-// || `[0x20000000, 0x23ffffff]` || LowShadow  ||
-// || `[0x00000000, 0x1fffffff]` || LowMem     ||
-//
-// Default Linux/SystemZ mapping:
-// || `[0x14000000000000, 0x1fffffffffffff]` || HighMem    ||
-// || `[0x12800000000000, 0x13ffffffffffff]` || HighShadow ||
-// || `[0x12000000000000, 0x127fffffffffff]` || ShadowGap  ||
-// || `[0x10000000000000, 0x11ffffffffffff]` || LowShadow  ||
-// || `[0x00000000000000, 0x0fffffffffffff]` || LowMem     ||
-//
-// Default Linux/SPARC64 (52-bit VMA) mapping:
-// || `[0x8000000000000, 0xfffffffffffff]` || HighMem    ||
-// || `[0x1080000000000, 0x207ffffffffff]` || HighShadow ||
-// || `[0x0090000000000, 0x107ffffffffff]` || ShadowGap  ||
-// || `[0x0080000000000, 0x008ffffffffff]` || LowShadow  ||
-// || `[0x0000000000000, 0x007ffffffffff]` || LowMem     ||
-//
-// Shadow mapping on FreeBSD/x86-64 with SHADOW_OFFSET == 0x400000000000:
-// || `[0x500000000000, 0x7fffffffffff]` || HighMem    ||
-// || `[0x4a0000000000, 0x4fffffffffff]` || HighShadow ||
-// || `[0x480000000000, 0x49ffffffffff]` || ShadowGap  ||
-// || `[0x400000000000, 0x47ffffffffff]` || LowShadow  ||
-// || `[0x000000000000, 0x3fffffffffff]` || LowMem     ||
-//
-// Shadow mapping on FreeBSD/i386 with SHADOW_OFFSET == 0x40000000:
-// || `[0x60000000, 0xffffffff]` || HighMem    ||
-// || `[0x4c000000, 0x5fffffff]` || HighShadow ||
-// || `[0x48000000, 0x4bffffff]` || ShadowGap  ||
-// || `[0x40000000, 0x47ffffff]` || LowShadow  ||
-// || `[0x00000000, 0x3fffffff]` || LowMem     ||
-//
-// Shadow mapping on NetBSD/x86-64 with SHADOW_OFFSET == 0x400000000000:
-// || `[0x4feffffffe01, 0x7f7ffffff000]` || HighMem    ||
-// || `[0x49fdffffffc0, 0x4feffffffe00]` || HighShadow ||
-// || `[0x480000000000, 0x49fdffffffbf]` || ShadowGap  ||
-// || `[0x400000000000, 0x47ffffffffff]` || LowShadow  ||
-// || `[0x000000000000, 0x3fffffffffff]` || LowMem     ||
-//
-// Shadow mapping on NetBSD/i386 with SHADOW_OFFSET == 0x40000000:
-// || `[0x60000000, 0xfffff000]` || HighMem    ||
-// || `[0x4c000000, 0x5fffffff]` || HighShadow ||
-// || `[0x48000000, 0x4bffffff]` || ShadowGap  ||
-// || `[0x40000000, 0x47ffffff]` || LowShadow  ||
-// || `[0x00000000, 0x3fffffff]` || LowMem     ||
-//
-// Default Windows/i386 mapping:
-// (the exact location of HighShadow/HighMem may vary depending
-//  on WoW64, /LARGEADDRESSAWARE, etc).
-// || `[0x50000000, 0xffffffff]` || HighMem    ||
-// || `[0x3a000000, 0x4fffffff]` || HighShadow ||
-// || `[0x36000000, 0x39ffffff]` || ShadowGap  ||
-// || `[0x30000000, 0x35ffffff]` || LowShadow  ||
-// || `[0x00000000, 0x2fffffff]` || LowMem     ||
+#include "asan_shadow_defines.h"
 
 #if defined(ASAN_SHADOW_SCALE)
 static const u64 kDefaultShadowScale = ASAN_SHADOW_SCALE;
 #else
 static const u64 kDefaultShadowScale = 3;
 #endif
-static const u64 kDefaultShadowSentinel = ~(uptr)0;
-static const u64 kDefaultShadowOffset32 = 1ULL << 29;  // 0x20000000
-static const u64 kDefaultShadowOffset64 = 1ULL << 44;  // 0x100000000000
-static const u64 kDefaultShort64bitShadowOffset =
-    0x7FFFFFFF & (~0xFFFULL << kDefaultShadowScale);  // < 2G.
-static const u64 kAArch64_ShadowOffset64 = 1ULL << 36;  // 0x1000000000
-static const u64 kRiscv64_ShadowOffset64 = 0xd55550000;
-static const u64 kMIPS32_ShadowOffset32 = 0x0aaa0000;
-static const u64 kMIPS64_ShadowOffset64 = 1ULL << 37;   // 0x2000000000
-static const u64 kPPC64_ShadowOffset64 = 1ULL << 44;    // 0x100000000000
-static const u64 kSystemZ_ShadowOffset64 = 1ULL << 52;  // 0x10000000000000
-static const u64 kSPARC64_ShadowOffset64 = 1ULL << 43;  // 0x80000000000
-static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30;  // 0x40000000
-static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
-static const u64 kNetBSD_ShadowOffset32 = 1ULL << 30;  // 0x40000000
-static const u64 kNetBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
-static const u64 kWindowsShadowOffset32 = 3ULL << 28;  // 0x30000000
 
-#define SHADOW_SCALE kDefaultShadowScale
+static const u64 kDefaultShadowSentinel = ~(uptr)0;
 
-#if SANITIZER_FUCHSIA
-#  define SHADOW_OFFSET (0)
-#elif SANITIZER_WORDSIZE == 32
-#  if SANITIZER_ANDROID
-#    define SHADOW_OFFSET __asan_shadow_memory_dynamic_address
-#  elif defined(__mips__)
-#    define SHADOW_OFFSET kMIPS32_ShadowOffset32
-#  elif SANITIZER_FREEBSD
-#    define SHADOW_OFFSET kFreeBSD_ShadowOffset32
-#  elif SANITIZER_NETBSD
-#    define SHADOW_OFFSET kNetBSD_ShadowOffset32
-#  elif SANITIZER_WINDOWS
-#    define SHADOW_OFFSET kWindowsShadowOffset32
-#  elif SANITIZER_IOS
-#    define SHADOW_OFFSET __asan_shadow_memory_dynamic_address
-#  else
-#    define SHADOW_OFFSET kDefaultShadowOffset32
-#  endif
+#if defined(SHADOW_OFFSET_CONST)
+static const u64 kConstShadowOffset = SHADOW_OFFSET_CONST;
+#  define SHADOW_OFFSET kConstShadowOffset
 #else
-#  if SANITIZER_IOS
-#    define SHADOW_OFFSET __asan_shadow_memory_dynamic_address
-#  elif SANITIZER_MAC && defined(__aarch64__)
-#    define SHADOW_OFFSET __asan_shadow_memory_dynamic_address
-#  elif SANITIZER_RISCV64
-#    define SHADOW_OFFSET kRiscv64_ShadowOffset64
-#  elif defined(__aarch64__)
-#    define SHADOW_OFFSET kAArch64_ShadowOffset64
-#  elif defined(__powerpc64__)
-#    define SHADOW_OFFSET kPPC64_ShadowOffset64
-#  elif defined(__s390x__)
-#    define SHADOW_OFFSET kSystemZ_ShadowOffset64
-#  elif SANITIZER_FREEBSD
-#    define SHADOW_OFFSET kFreeBSD_ShadowOffset64
-#  elif SANITIZER_NETBSD
-#    define SHADOW_OFFSET kNetBSD_ShadowOffset64
-#  elif SANITIZER_MAC
-#    define SHADOW_OFFSET kDefaultShadowOffset64
-#  elif defined(__mips64)
-#    define SHADOW_OFFSET kMIPS64_ShadowOffset64
-#  elif defined(__sparc__)
-#    define SHADOW_OFFSET kSPARC64_ShadowOffset64
-#  elif SANITIZER_WINDOWS64
-#    define SHADOW_OFFSET __asan_shadow_memory_dynamic_address
-#  else
-#    define SHADOW_OFFSET kDefaultShort64bitShadowOffset
-#  endif
+#  define SHADOW_OFFSET __asan_shadow_memory_dynamic_address
 #endif
 
+#define SHADOW_SCALE kDefaultShadowScale
+
 #if SANITIZER_ANDROID && defined(__arm__)
 # define ASAN_PREMAP_SHADOW 1
 #else
diff --git a/compiler-rt/lib/asan/asan_shadow_defines.h b/compiler-rt/lib/asan/asan_shadow_defines.h
new file mode 100644
--- /dev/null
+++ b/compiler-rt/lib/asan/asan_shadow_defines.h
@@ -0,0 +1,195 @@
+//===-- asan_shadow_defines.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 AddressSanitizer, an address sanity checker.
+//
+// Defines ASan memory mapping used by assembly portion.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_platform.h"
+
+// The full explanation of the memory mapping could be found here:
+// https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm
+//
+// Typical shadow mapping on Linux/x86_64 with SHADOW_OFFSET == 0x00007fff8000:
+// || `[0x10007fff8000, 0x7fffffffffff]` || HighMem    ||
+// || `[0x02008fff7000, 0x10007fff7fff]` || HighShadow ||
+// || `[0x00008fff7000, 0x02008fff6fff]` || ShadowGap  ||
+// || `[0x00007fff8000, 0x00008fff6fff]` || LowShadow  ||
+// || `[0x000000000000, 0x00007fff7fff]` || LowMem     ||
+//
+// When SHADOW_OFFSET is zero (-pie):
+// || `[0x100000000000, 0x7fffffffffff]` || HighMem    ||
+// || `[0x020000000000, 0x0fffffffffff]` || HighShadow ||
+// || `[0x000000040000, 0x01ffffffffff]` || ShadowGap  ||
+//
+// Special case when something is already mapped between
+// 0x003000000000 and 0x005000000000 (e.g. when prelink is installed):
+// || `[0x10007fff8000, 0x7fffffffffff]` || HighMem    ||
+// || `[0x02008fff7000, 0x10007fff7fff]` || HighShadow ||
+// || `[0x005000000000, 0x02008fff6fff]` || ShadowGap3 ||
+// || `[0x003000000000, 0x004fffffffff]` || MidMem     ||
+// || `[0x000a7fff8000, 0x002fffffffff]` || ShadowGap2 ||
+// || `[0x00067fff8000, 0x000a7fff7fff]` || MidShadow  ||
+// || `[0x00008fff7000, 0x00067fff7fff]` || ShadowGap  ||
+// || `[0x00007fff8000, 0x00008fff6fff]` || LowShadow  ||
+// || `[0x000000000000, 0x00007fff7fff]` || LowMem     ||
+//
+// Default Linux/i386 mapping on x86_64 machine:
+// || `[0x40000000, 0xffffffff]` || HighMem    ||
+// || `[0x28000000, 0x3fffffff]` || HighShadow ||
+// || `[0x24000000, 0x27ffffff]` || ShadowGap  ||
+// || `[0x20000000, 0x23ffffff]` || LowShadow  ||
+// || `[0x00000000, 0x1fffffff]` || LowMem     ||
+//
+// Default Linux/i386 mapping on i386 machine
+// (addresses starting with 0xc0000000 are reserved
+// for kernel and thus not sanitized):
+// || `[0x38000000, 0xbfffffff]` || HighMem    ||
+// || `[0x27000000, 0x37ffffff]` || HighShadow ||
+// || `[0x24000000, 0x26ffffff]` || ShadowGap  ||
+// || `[0x20000000, 0x23ffffff]` || LowShadow  ||
+// || `[0x00000000, 0x1fffffff]` || LowMem     ||
+//
+// Default Linux/MIPS32 mapping:
+// || `[0x2aaa0000, 0xffffffff]` || HighMem    ||
+// || `[0x0fff4000, 0x2aa9ffff]` || HighShadow ||
+// || `[0x0bff4000, 0x0fff3fff]` || ShadowGap  ||
+// || `[0x0aaa0000, 0x0bff3fff]` || LowShadow  ||
+// || `[0x00000000, 0x0aa9ffff]` || LowMem     ||
+//
+// Default Linux/MIPS64 mapping:
+// || `[0x4000000000, 0xffffffffff]` || HighMem    ||
+// || `[0x2800000000, 0x3fffffffff]` || HighShadow ||
+// || `[0x2400000000, 0x27ffffffff]` || ShadowGap  ||
+// || `[0x2000000000, 0x23ffffffff]` || LowShadow  ||
+// || `[0x0000000000, 0x1fffffffff]` || LowMem     ||
+//
+// Default Linux/RISCV64 Sv39 mapping:
+// || `[0x1555550000, 0x3fffffffff]` || HighMem    ||
+// || `[0x0fffffa000, 0x1555555fff]` || HighShadow ||
+// || `[0x0effffa000, 0x0fffff9fff]` || ShadowGap  ||
+// || `[0x0d55550000, 0x0effff9fff]` || LowShadow  ||
+// || `[0x0000000000, 0x0d5554ffff]` || LowMem     ||
+//
+// Default Linux/AArch64 (39-bit VMA) mapping:
+// || `[0x2000000000, 0x7fffffffff]` || highmem    ||
+// || `[0x1400000000, 0x1fffffffff]` || highshadow ||
+// || `[0x1200000000, 0x13ffffffff]` || shadowgap  ||
+// || `[0x1000000000, 0x11ffffffff]` || lowshadow  ||
+// || `[0x0000000000, 0x0fffffffff]` || lowmem     ||
+//
+// Default Linux/AArch64 (42-bit VMA) mapping:
+// || `[0x10000000000, 0x3ffffffffff]` || highmem    ||
+// || `[0x0a000000000, 0x0ffffffffff]` || highshadow ||
+// || `[0x09000000000, 0x09fffffffff]` || shadowgap  ||
+// || `[0x08000000000, 0x08fffffffff]` || lowshadow  ||
+// || `[0x00000000000, 0x07fffffffff]` || lowmem     ||
+//
+// Default Linux/S390 mapping:
+// || `[0x30000000, 0x7fffffff]` || HighMem    ||
+// || `[0x26000000, 0x2fffffff]` || HighShadow ||
+// || `[0x24000000, 0x25ffffff]` || ShadowGap  ||
+// || `[0x20000000, 0x23ffffff]` || LowShadow  ||
+// || `[0x00000000, 0x1fffffff]` || LowMem     ||
+//
+// Default Linux/SystemZ mapping:
+// || `[0x14000000000000, 0x1fffffffffffff]` || HighMem    ||
+// || `[0x12800000000000, 0x13ffffffffffff]` || HighShadow ||
+// || `[0x12000000000000, 0x127fffffffffff]` || ShadowGap  ||
+// || `[0x10000000000000, 0x11ffffffffffff]` || LowShadow  ||
+// || `[0x00000000000000, 0x0fffffffffffff]` || LowMem     ||
+//
+// Default Linux/SPARC64 (52-bit VMA) mapping:
+// || `[0x8000000000000, 0xfffffffffffff]` || HighMem    ||
+// || `[0x1080000000000, 0x207ffffffffff]` || HighShadow ||
+// || `[0x0090000000000, 0x107ffffffffff]` || ShadowGap  ||
+// || `[0x0080000000000, 0x008ffffffffff]` || LowShadow  ||
+// || `[0x0000000000000, 0x007ffffffffff]` || LowMem     ||
+//
+// Shadow mapping on FreeBSD/x86-64 with SHADOW_OFFSET == 0x400000000000:
+// || `[0x500000000000, 0x7fffffffffff]` || HighMem    ||
+// || `[0x4a0000000000, 0x4fffffffffff]` || HighShadow ||
+// || `[0x480000000000, 0x49ffffffffff]` || ShadowGap  ||
+// || `[0x400000000000, 0x47ffffffffff]` || LowShadow  ||
+// || `[0x000000000000, 0x3fffffffffff]` || LowMem     ||
+//
+// Shadow mapping on FreeBSD/i386 with SHADOW_OFFSET == 0x40000000:
+// || `[0x60000000, 0xffffffff]` || HighMem    ||
+// || `[0x4c000000, 0x5fffffff]` || HighShadow ||
+// || `[0x48000000, 0x4bffffff]` || ShadowGap  ||
+// || `[0x40000000, 0x47ffffff]` || LowShadow  ||
+// || `[0x00000000, 0x3fffffff]` || LowMem     ||
+//
+// Shadow mapping on NetBSD/x86-64 with SHADOW_OFFSET == 0x400000000000:
+// || `[0x4feffffffe01, 0x7f7ffffff000]` || HighMem    ||
+// || `[0x49fdffffffc0, 0x4feffffffe00]` || HighShadow ||
+// || `[0x480000000000, 0x49fdffffffbf]` || ShadowGap  ||
+// || `[0x400000000000, 0x47ffffffffff]` || LowShadow  ||
+// || `[0x000000000000, 0x3fffffffffff]` || LowMem     ||
+//
+// Shadow mapping on NetBSD/i386 with SHADOW_OFFSET == 0x40000000:
+// || `[0x60000000, 0xfffff000]` || HighMem    ||
+// || `[0x4c000000, 0x5fffffff]` || HighShadow ||
+// || `[0x48000000, 0x4bffffff]` || ShadowGap  ||
+// || `[0x40000000, 0x47ffffff]` || LowShadow  ||
+// || `[0x00000000, 0x3fffffff]` || LowMem     ||
+//
+// Default Windows/i386 mapping:
+// (the exact location of HighShadow/HighMem may vary depending
+//  on WoW64, /LARGEADDRESSAWARE, etc).
+// || `[0x50000000, 0xffffffff]` || HighMem    ||
+// || `[0x3a000000, 0x4fffffff]` || HighShadow ||
+// || `[0x36000000, 0x39ffffff]` || ShadowGap  ||
+// || `[0x30000000, 0x35ffffff]` || LowShadow  ||
+// || `[0x00000000, 0x2fffffff]` || LowMem     ||
+
+#if !defined(SANITIZER_WORDSIZE)
+#  error "SANITIZER_WORDSIZE must be defined."
+#endif
+
+#if SANITIZER_FUCHSIA
+#  define SHADOW_OFFSET_CONST 0x0
+#elif SANITIZER_WORDSIZE == 32
+#  if defined(__mips__)
+#    define SHADOW_OFFSET_CONST 0xaaa0000
+#  elif SANITIZER_FREEBSD
+#    define SHADOW_OFFSET_CONST 0x40000000
+#  elif SANITIZER_NETBSD
+#    define SHADOW_OFFSET_CONST 0x40000000
+#  elif SANITIZER_WINDOWS
+#    define SHADOW_OFFSET_CONST 0x30000000
+#  else
+#    define SHADOW_OFFSET_CONST 0x20000000
+#  endif
+#elif SANITIZER_WORDSIZE == 64
+#  if SANITIZER_RISCV64
+#    define SHADOW_OFFSET_CONST 0x0d55550000
+#  elif defined(__aarch64__)
+#    define SHADOW_OFFSET_CONST 0x1000000000
+#  elif defined(__powerpc64__)
+#    define SHADOW_OFFSET_CONST 0x100000000000
+#  elif defined(__s390x__)
+#    define SHADOW_OFFSET_CONST 0x10000000000000
+#  elif SANITIZER_FREEBSD
+#    define SHADOW_OFFSET_CONST 0x400000000000
+#  elif SANITIZER_NETBSD
+#    define SHADOW_OFFSET_CONST 0x400000000000
+#  elif SANITIZER_MAC
+#    define SHADOW_OFFSET_CONST 0x100000000000
+#  elif defined(__mips64)
+#    define SHADOW_OFFSET_CONST 0x02000000000
+#  elif defined(__sparc__)
+#    define SHADOW_OFFSET_CONST 0x80000000000
+#  else
+#    if defined(ASAN_SHADOW_SCALE) && (ASAN_SHADOW_SCALE != 3)
+#      error "Only ASAN_SHADOW_SCALE = 3 is supported."
+#    endif
+#    define SHADOW_OFFSET_CONST 0x7fff8000
+#  endif
+#endif