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[AddressSanitizer] Put shadow at 0 for Fuchsia 

The Fuchsia ASan runtime reserves the low part of the address space.

Patch by Roland McGrath

Differential Revision: https://reviews.llvm.org/D30426

llvm-svn: 296405
This commit is contained in:
Petr Hosek 2017-02-27 22:49:37 +00:00
parent fa912a7151
commit 6f16857167
1 changed files with 6 additions and 1 deletions
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7
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -394,6 +394,7 @@ static ShadowMapping getShadowMapping(Triple &TargetTriple, int LongSize,
TargetTriple.getArch() == llvm::Triple::mips64el;
bool IsAArch64 = TargetTriple.getArch() == llvm::Triple::aarch64;
bool IsWindows = TargetTriple.isOSWindows();
bool IsFuchsia = TargetTriple.isOSFuchsia();
ShadowMapping Mapping;
@ -414,7 +415,11 @@ static ShadowMapping getShadowMapping(Triple &TargetTriple, int LongSize,
else
Mapping.Offset = kDefaultShadowOffset32;
} else { // LongSize == 64
if (IsPPC64)
// Fuchsia is always PIE, which means that the beginning of the address
// space is always available.
if (IsFuchsia)
Mapping.Offset = 0;
else if (IsPPC64)
Mapping.Offset = kPPC64_ShadowOffset64;
else if (IsSystemZ)
Mapping.Offset = kSystemZ_ShadowOffset64;