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[sanitizer] GetTls: work around ppc64 with glibc<2.25(?) or GNU ld 2.30 

GNU ld 2.26 and GNU ld 2.31 seem fine but GNU ld 2.30 has mysterious
segfaults linking msan tests.
This commit is contained in:
Fangrui Song 2021-04-16 14:03:28 -07:00
parent bb0e1ae7c4
commit 08843a0c3f
1 changed files with 8 additions and 1 deletions
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9
compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
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@ -203,7 +203,7 @@ void InitTlsSize() {
g_use_dlpi_tls_data =
GetLibcVersion(&major, &minor, &patch) && major == 2 && minor >= 25;
#ifdef __x86_64__
#if defined(__x86_64__) || defined(__powerpc64__)
void *get_tls_static_info = dlsym(RTLD_NEXT, "_dl_get_tls_static_info");
size_t tls_align;
((void (*)(size_t *, size_t *))get_tls_static_info)(&g_tls_size, &tls_align);
@ -429,6 +429,13 @@ static void GetTls(uptr *addr, uptr *size) {
*size = g_tls_size;
*addr -= *size;
*addr += ThreadDescriptorSize();
#elif SANITIZER_GLIBC && defined(__powerpc64__)
// Workaround for glibc<2.25(?). 2.27 is known to not need this.
uptr tp;
asm("addi %0,13,-0x7000" : "=r"(tp));
const uptr pre_tcb_size = TlsPreTcbSize();
*addr = tp - pre_tcb_size;
*size = g_tls_size + pre_tcb_size;
#elif SANITIZER_FREEBSD || SANITIZER_LINUX
uptr align;
GetStaticTlsBoundary(addr, size, &align);