diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
@@ -327,7 +327,8 @@
   return kThreadSelfOffset;
 }
 
-#if defined(__mips__) || defined(__powerpc64__)
+#if defined(__mips__) || defined(__powerpc64__) || \
+    (defined(__riscv) && (__riscv_xlen == 64))
 // TlsPreTcbSize includes size of struct pthread_descr and size of tcb
 // head structure. It lies before the static tls blocks.
 static uptr TlsPreTcbSize() {
@@ -335,6 +336,8 @@
   const uptr kTcbHead = 16; // sizeof (tcbhead_t)
 # elif defined(__powerpc64__)
   const uptr kTcbHead = 88; // sizeof (tcbhead_t)
+#elif (defined(__riscv) && (__riscv_xlen == 64))
+  const uptr kTcbHead = 16;  // sizeof (tcbhead_t)
 # endif
   const uptr kTlsAlign = 16;
   const uptr kTlsPreTcbSize =
@@ -364,6 +367,15 @@
 # elif defined(__aarch64__) || defined(__arm__)
   descr_addr = reinterpret_cast<uptr>(__builtin_thread_pointer()) -
                                       ThreadDescriptorSize();
+#elif (defined(__riscv) && (__riscv_xlen == 64))
+
+  uptr tcb_end;
+  asm volatile("mv %0, tp;\n" : "=r"(tcb_end));
+  // https://github.com/riscv/riscv-elf-psabi-doc/issues/53
+  const uptr kTlsTcbOffset = 0x800;
+  descr_addr =
+      reinterpret_cast<uptr>(tcb_end - kTlsTcbOffset - TlsPreTcbSize());
+
 # elif defined(__s390__)
   descr_addr = reinterpret_cast<uptr>(__builtin_thread_pointer());
 # elif defined(__powerpc64__)