[RISCV][sanitizer] Set SANITIZER_MMAP_RANGE_SIZE for sv57

[hauhsu]

Summary

This patch enables sanitizers for sv57 virtual memory mode.
Alloctor checks whether SANITIZER_MMAP_RANGE_SIZE matches possible mmap regions:
sanitizer_allocator_primary32.h:292 "((res)) <((kNumPossibleRegions))"

Since SANITIZER_MMAP_RANGE_SIZE only controls "possible" mmap regions,
setting it to (1 << 57) also works for sv39 and sv48.

Depends on D139827

[MaskRay]

Since SANITIZER_MMAP_RANGE_SIZE only controls "possible" mmap regions, setting it to (1 << 57) also works for sv39 and sv48.

Why is (1 << 57) also supported by Sv48?

[hauhsu]

In D152990#4545483, @MaskRay wrote:

Since SANITIZER_MMAP_RANGE_SIZE only controls "possible" mmap regions, setting it to (1 << 57) also works for sv39 and sv48.

Why is (1 << 57) also supported by Sv48?

Without this patch, I encountered runtime error in SV57:

AddressSanitizer: CHECK failed: sanitizer_allocator_primary32.h:292 "((res)) < ((kNumPossibleRegions))" (0xffffffb72, 0x8000000)

I noted that the check comes from the AP32 header, even though we are using RV64.

So I dived a little bit deeper, there are 2 allocators in the sanitizer framework:

1. internal allocator (sanitizer_allocator_internal.h): used by sanitizer framework internally (like dlsym or deadlock detector). Always AP32.
2. xSAN allocator: dedicated for a specific sanitizer (asan_allocator.h for example)

And in Sv57, when the test program is initializing, it tries to access a memory larger then (1 << 48), which triggers the error.
In my memory the error occurs when the internal allocator is handling dlsym (https://reviews.llvm.org/D112588).

It seems to me that SANITIZER_MMAP_RANGE_SIZE only controls the largest mmap region.
In Sv48 we won't touch any memory region in Sv57, so setting it to a larger size (1 << 57) won't hurt.

compiler-rt/lib/sanitizer_common/sanitizer_platform.h

 //===-- sanitizer_platform.h ------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //

 // will still work but will consume more memory for TwoLevelByteMap.
 #if defined(__mips__)
 #  if SANITIZER_GO && defined(__mips64)
 #    define SANITIZER_MMAP_RANGE_SIZE FIRST_32_SECOND_64(1ULL << 32, 1ULL << 47)
 #  else
 #    define SANITIZER_MMAP_RANGE_SIZE FIRST_32_SECOND_64(1ULL << 32, 1ULL << 40)
 #  endif
 #elif SANITIZER_RISCV64
-// FIXME: Set to 47 to ensure it works with both Sv39 and Sv48; however,
-// this will not work correctly on Sv57.
-#  define SANITIZER_MMAP_RANGE_SIZE FIRST_32_SECOND_64(1ULL << 32, 1ULL << 47)
+#  define SANITIZER_MMAP_RANGE_SIZE FIRST_32_SECOND_64(1ULL << 32, 1ULL << 57)
 #elif defined(__aarch64__)
 #  if SANITIZER_APPLE
 #    if SANITIZER_OSX || SANITIZER_IOSSIM
 #      define SANITIZER_MMAP_RANGE_SIZE \
         FIRST_32_SECOND_64(1ULL << 32, 1ULL << 47)
 #    else
 // Darwin iOS/ARM64 has a 36-bit VMA, 64GiB VM
 #      define SANITIZER_MMAP_RANGE_SIZE \