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[sanitizers] Add DFSan support for AArch64 42-bit VMA 

This patch adds support for dfsan on aarch64-linux with 42-bit VMA
(current default config for 64K pagesize kernels).  The support is
enabled by defining the SANITIZER_AARCH64_VMA to 42 at build time
for both clang/llvm and compiler-rt.  The default VMA is 39 bits.

llvm-svn: 245840
This commit is contained in:
Adhemerval Zanella 2015-08-24 13:48:10 +00:00
parent 0f4b17d12c
commit 4754e2d59c
1 changed files with 14 additions and 0 deletions
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14
llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
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@ -72,6 +72,16 @@
using namespace llvm;
// VMA size definition for architecture that support multiple sizes.
// AArch64 has 3 VMA sizes: 39, 42 and 48.
#ifndef SANITIZER_AARCH64_VMA
# define SANITIZER_AARCH64_VMA 39
#else
# if SANITIZER_AARCH64_VMA != 39 && SANITIZER_AARCH64_VMA != 42
# error "invalid SANITIZER_AARCH64_VMA size"
# endif
#endif
// The -dfsan-preserve-alignment flag controls whether this pass assumes that
// alignment requirements provided by the input IR are correct. For example,
// if the input IR contains a load with alignment 8, this flag will cause
@ -437,7 +447,11 @@ bool DataFlowSanitizer::doInitialization(Module &M) {
else if (IsMIPS64)
ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0xF000000000LL);
else if (IsAArch64)
#if SANITIZER_AARCH64_VMA == 39
ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x7800000000LL);
#else
ShadowPtrMask = ConstantInt::getSigned(IntptrTy, ~0x3c000000000LL);
#endif
else
report_fatal_error("unsupported triple");