[compiler-rt] [asan] Add config for AArch64 Linux with 39-bit VA. (PR #170929)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Eli Friedman (efriedma-quic)

<details>
<summary>Changes</summary>

This is leveraging work which has already been done for Android, which ships 39-bit VA kernels, and extending it to other embedded Linux targets.

(SANITIZER_AARCH64_39BIT_VA was added in 58c8f57681.)

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Full diff: https://github.com/llvm/llvm-project/pull/170929.diff


1 Files Affected:

- (modified) compiler-rt/lib/asan/asan_allocator.h (+1-1) 


``````````diff
diff --git a/compiler-rt/lib/asan/asan_allocator.h b/compiler-rt/lib/asan/asan_allocator.h
index fdf456473fb02..e2ec877696c0a 100644
--- a/compiler-rt/lib/asan/asan_allocator.h
+++ b/compiler-rt/lib/asan/asan_allocator.h
@@ -200,7 +200,7 @@ const uptr kAllocatorSpace = ~(uptr)0;
 #    if defined(__powerpc64__)
 const uptr kAllocatorSize  =  0x20000000000ULL;  // 2T.
 typedef DefaultSizeClassMap SizeClassMap;
-#    elif defined(__aarch64__) && SANITIZER_ANDROID
+#    elif defined(__aarch64__) && (SANITIZER_ANDROID || defined(SANITIZER_AARCH64_39BIT_VA))
 // Android needs to support 39, 42 and 48 bit VMA.
 const uptr kAllocatorSize  =  0x2000000000ULL;  // 128G.
 typedef VeryCompactSizeClassMap SizeClassMap;

``````````

</details>


https://github.com/llvm/llvm-project/pull/170929