Unsubmitted part of D44599

lib/sanitizer_common/sanitizer_linux.cc

 }
 #endif
 
 uptr internal_stat(const char *path, void *buf) {
 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD
   return internal_syscall_ptr(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf,
                               0);
 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
-  return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf,
-                          0);
+  return internal_syscall_ptr(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
+                              (uptr)buf, 0);
 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
 # if defined(__mips64)
   // For mips64, stat syscall fills buffer in the format of kernel_stat
   struct kernel_stat kbuf;
-  int res = internal_syscall(SYSCALL(stat), path, &kbuf);
+  int res = internal_syscall_ptr(SYSCALL(stat), path, &kbuf);
   kernel_stat_to_stat(&kbuf, (struct stat *)buf);
   return res;
 # else
-  return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf);
+  return internal_syscall_ptr(SYSCALL(stat), (uptr)path, (uptr)buf);
 # endif
 #else
   struct stat64 buf64;
-  int res = internal_syscall(SYSCALL(stat64), path, &buf64);
+  int res = internal_syscall_ptr(SYSCALL(stat64), path, &buf64);
   stat64_to_stat(&buf64, (struct stat *)buf);
   return res;
 #endif
 }
 
 uptr internal_lstat(const char *path, void *buf) {
 #if SANITIZER_NETBSD
   return internal_syscall_ptr(SYSCALL(lstat), path, buf);
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
   return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0);
 #else
   return internal_syscall(SYSCALL(dup2), oldfd, newfd);
 #endif
 }
 
 uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD
-  return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf,
-                          bufsize);
+  return internal_syscall_ptr(SYSCALL(readlinkat), AT_FDCWD, (uptr)path,
+                              (uptr)buf, bufsize);
 #else
   return internal_syscall_ptr(SYSCALL(readlink), path, buf, bufsize);
 #endif
 }
 
 uptr internal_unlink(const char *path) {
 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD
-  return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0);
+  return internal_syscall_ptr(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0);
 #else
   return internal_syscall_ptr(SYSCALL(unlink), (uptr)path);
 #endif
 }
 
 uptr internal_rename(const char *oldpath, const char *newpath) {
 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD
-  return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD,
-                          (uptr)newpath);
+  return internal_syscall_ptr(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath,
+                              AT_FDCWD, (uptr)newpath);
 #else
   return internal_syscall_ptr(SYSCALL(rename), (uptr)oldpath, (uptr)newpath);
 #endif
 }
 
 uptr internal_sched_yield() {
   return internal_syscall(SYSCALL(sched_yield));
 }

 #endif // !SANITIZER_OPENBSD
 }
 
 void SignalContext::DumpAllRegisters(void *context) {
   // FIXME: Implement this.
 }
 
 static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
-#if SANITIZER_NETBSD
+#if SANITIZER_OPENBSD
+  *pc = 0;
+  *bp = 0;
+  *sp = 0;
+#elif 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;