commit 4094c07d64c5071fad86158732bfaae891b0cba1
author Youling Tang <tangyouling@loongson.cn> Thu Nov 10 13:32:24 2022 +0800
committer Copybara-Service <copybara-worker@google.com> Wed Nov 09 21:36:20 2022 -0800
tree 1911c7eafe0db4414e4ab4674f4fdcab1b5caf6f
parent 9607143b30aa125adbdcfa6fd5ef5fd1b6f958f0

[sanitizer] Add GetMaxVirtualAddress() support for LoongArch

Add support for getting the maximum virtual address, LoongArch has multiple
address space layouts, the default maximum virtual address of the current
user space is 47 bits. (from TASK_SIZE in the kernel for loongarch64).

Reviewed By: SixWeining

Differential Revision: https://reviews.llvm.org/D137219

GitOrigin-RevId: eae8d93dc26837c2aa5764b7761e4d475b154081

lib/sanitizer_common/sanitizer_linux.cpp

diff --git a/lib/sanitizer_common/sanitizer_linux.cpp b/lib/sanitizer_common/sanitizer_linux.cpp
index dc2ea93..5d1bf95 100644
--- a/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/lib/sanitizer_common/sanitizer_linux.cpp
@@ -1105,7 +1105,7 @@
 #if SANITIZER_NETBSD && defined(__x86_64__)
   return 0x7f7ffffff000ULL;  // (0x00007f8000000000 - PAGE_SIZE)
 #elif SANITIZER_WORDSIZE == 64
-# if defined(__powerpc64__) || defined(__aarch64__)
+# if defined(__powerpc64__) || defined(__aarch64__) || defined(__loongarch__)
   // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
   // We somehow need to figure out which one we are using now and choose
   // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
@@ -1113,6 +1113,7 @@
   // of the address space, so simply checking the stack address is not enough.
   // This should (does) work for both PowerPC64 Endian modes.
   // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
+  // loongarch64 also has multiple address space layouts: default is 47-bit.
   return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
 #elif SANITIZER_RISCV64
   return (1ULL << 38) - 1;