Index: lib/sanitizer_common/sanitizer_linux.cc
===================================================================
--- lib/sanitizer_common/sanitizer_linux.cc
+++ lib/sanitizer_common/sanitizer_linux.cc
@@ -1725,7 +1725,13 @@
 }
 
 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
-#if defined(__arm__)
+#if SANITIZER_NETBSD
+  // This covers all NetBSD architectures
+  ucontext_t *ucontext = (ucontext_t *)context;
+  *pc = _UC_MACHINE_PC(ucontext);
+  *bp = _UC_MACHINE_FP(ucontext);
+  *sp = _UC_MACHINE_SP(ucontext);
+#elif defined(__arm__)
   ucontext_t *ucontext = (ucontext_t*)context;
   *pc = ucontext->uc_mcontext.arm_pc;
   *bp = ucontext->uc_mcontext.arm_fp;
@@ -1747,11 +1753,6 @@
   *pc = ucontext->uc_mcontext.mc_rip;
   *bp = ucontext->uc_mcontext.mc_rbp;
   *sp = ucontext->uc_mcontext.mc_rsp;
-#elif SANITIZER_NETBSD
-  ucontext_t *ucontext = (ucontext_t *)context;
-  *pc = ucontext->uc_mcontext.__gregs[_REG_RIP];
-  *bp = ucontext->uc_mcontext.__gregs[_REG_RBP];
-  *sp = ucontext->uc_mcontext.__gregs[_REG_RSP];
 # else
   ucontext_t *ucontext = (ucontext_t*)context;
   *pc = ucontext->uc_mcontext.gregs[REG_RIP];
@@ -1764,11 +1765,6 @@
   *pc = ucontext->uc_mcontext.mc_eip;
   *bp = ucontext->uc_mcontext.mc_ebp;
   *sp = ucontext->uc_mcontext.mc_esp;
-#elif SANITIZER_NETBSD
-  ucontext_t *ucontext = (ucontext_t *)context;
-  *pc = ucontext->uc_mcontext.__gregs[_REG_EIP];
-  *bp = ucontext->uc_mcontext.__gregs[_REG_EBP];
-  *sp = ucontext->uc_mcontext.__gregs[_REG_ESP];
 # else
   ucontext_t *ucontext = (ucontext_t*)context;
 # if SANITIZER_SOLARIS
Index: lib/ubsan/ubsan_platform.h
===================================================================
--- lib/ubsan/ubsan_platform.h
+++ lib/ubsan/ubsan_platform.h
@@ -14,13 +14,9 @@
 #define UBSAN_PLATFORM_H
 
 // Other platforms should be easy to add, and probably work as-is.
-#if (defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) ||       \
-     defined(__NetBSD__)) &&                                                   \
-    (defined(__x86_64__) || defined(__i386__) || defined(__arm__) ||           \
-     defined(__aarch64__) || defined(__mips__) || defined(__powerpc64__) ||    \
-     defined(__s390__)) || (defined(__sun__) && defined(__svr4__))
-# define CAN_SANITIZE_UB 1
-#elif defined(_WIN32) || defined(__Fuchsia__)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) ||        \
+    defined(__NetBSD__) || (defined(__sun__) && defined(__svr4__)) ||          \
+    defined(_WIN32) || defined(__Fuchsia__)
 # define CAN_SANITIZE_UB 1
 #else
 # define CAN_SANITIZE_UB 0