[compiler-rt] r311937 - Add NetBSD ASAN shadow mapping for x86-64

[Kamil Rytarowski via llvm-commits]

Author: kamil
Date: Mon Aug 28 14:41:04 2017
New Revision: 311937

URL: http://llvm.org/viewvc/llvm-project?rev=311937&view=rev
Log:
Add NetBSD ASAN shadow mapping for x86-64

Summary:
The maximal virtual address on NetBSD/amd64 is 0x7f7ffffff000.
Define shadow offset 0x400000000000 (1ULL << 46).

Sponsored by <The NetBSD Foundation>

Reviewers: joerg, vitalybuka, filcab, fjricci, kcc, eugenis, pcc

Reviewed By: kcc

Subscribers: llvm-commits, kubamracek, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D36587

Modified:
    compiler-rt/trunk/lib/asan/asan_mapping.h

Modified: compiler-rt/trunk/lib/asan/asan_mapping.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/asan/asan_mapping.h?rev=311937&r1=311936&r2=311937&view=diff
==============================================================================
--- compiler-rt/trunk/lib/asan/asan_mapping.h (original)
+++ compiler-rt/trunk/lib/asan/asan_mapping.h Mon Aug 28 14:41:04 2017
@@ -115,6 +115,13 @@
 // || `[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     ||
+//
 // Default Windows/i386 mapping:
 // (the exact location of HighShadow/HighMem may vary depending
 //  on WoW64, /LARGEADDRESSAWARE, etc).
@@ -140,6 +147,7 @@ static const u64 kPPC64_ShadowOffset64 =
 static const u64 kSystemZ_ShadowOffset64 = 1ULL << 52;
 static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30;  // 0x40000000
 static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
+static const u64 kNetBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
 static const u64 kWindowsShadowOffset32 = 3ULL << 28;  // 0x30000000
 
 #define SHADOW_SCALE kDefaultShadowScale
@@ -179,6 +187,8 @@ static const u64 kWindowsShadowOffset32
 #    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)