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[asan] Remove special case mapping on Android/AArch64.

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ASan shadow on Android starts at address 0 for both historic and
performance reasons. This is possible because the platform mandates
-pie, which makes lower memory region always available.

This is not such a good idea on 64-bit platforms because of MAP_32BIT
incompatibility.

This patch changes Android/AArch64 mapping to be the same as that of
Linux/AAarch64.

llvm-svn: 243548
This commit is contained in:
Evgeniy Stepanov 2015-07-29 18:22:25 +00:00
parent fa2563134a
commit af5c29d437
1 changed files with 4 additions and 4 deletions
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8
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -340,12 +340,12 @@ static ShadowMapping getShadowMapping(Triple &TargetTriple, int LongSize,
ShadowMapping Mapping;
if (IsAndroid) {
if (LongSize == 32) {
// Android is always PIE, which means that the beginning of the address
// space is always available.
Mapping.Offset = 0;
} else if (LongSize == 32) {
if (IsMIPS32)
if (IsAndroid)
Mapping.Offset = 0;
else if (IsMIPS32)
Mapping.Offset = kMIPS32_ShadowOffset32;
else if (IsFreeBSD)
Mapping.Offset = kFreeBSD_ShadowOffset32;