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libsanitizer: cherry-pick commit b226894d475b from upstream 

cherry-pick:

b226894d475b [sanitizer] [sanitizer] Correct GetTls for x32
This commit is contained in:
H.J. Lu 2022-05-05 13:59:16 -07:00
parent b6b6600678
commit a48be2e513
1 changed files with 4 additions and 0 deletions
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libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cpp
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@ -462,7 +462,11 @@ static void GetTls(uptr *addr, uptr *size) {
#elif SANITIZER_GLIBC && defined(__x86_64__)
// For aarch64 and x86-64, use an O(1) approach which requires relatively
// precise ThreadDescriptorSize. g_tls_size was initialized in InitTlsSize.
# if SANITIZER_X32
asm("mov %%fs:8,%0" : "=r"(*addr));
# else
asm("mov %%fs:16,%0" : "=r"(*addr));
# endif
*size = g_tls_size;
*addr -= *size;
*addr += ThreadDescriptorSize();