[sanitizer] Don't use newfstatat for Linux on SPARC

[glaubitz]

Summary

Linux on SPARC uses fstatat64 instead.

[glaubitz]

Could someone land this for me? Thanks!

[MaskRay]

In D125572#3514095, @glaubitz wrote:

Could someone land this for me? Thanks!

Hi. I am waiting a bit for others to conform this is the direction to work around sparc64.

[eugenis]

LGTM

Seems fine to me, if fstatat64 is indeed the canonical syscall on sparc.

[glaubitz]

In D125572#3516637, @eugenis wrote:

LGTM

Seems fine to me, if fstatat64 is indeed the canonical syscall on sparc.

Yep, it is: https://github.com/torvalds/linux/commit/40ad7a6afc53217ad95b5ae2221e42d7655e057b

compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

 #if SANITIZER_FREEBSD
   return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0);
 #    elif SANITIZER_LINUX
-#      if SANITIZER_WORDSIZE == 64 || SANITIZER_X32
+#      if (SANITIZER_WORDSIZE == 64 || SANITIZER_X32) && !SANITIZER_SPARC
   return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf,
                           0);
 #      else

   return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf,
                           AT_SYMLINK_NOFOLLOW);
 #    elif SANITIZER_LINUX
-#      if defined(_LP64) || SANITIZER_X32
+#      if (defined(_LP64) || SANITIZER_X32) && !SANITIZER_SPARC
   return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf,
                           AT_SYMLINK_NOFOLLOW);
 #      else

compiler-rt/lib/sanitizer_common/sanitizer_platform.h

 #  define SANITIZER_S390_64 0
 #endif
 
+#if defined(__sparc__)
+#  define SANITIZER_SPARC 1
+#  if defined(__arch64__)
+#    define SANITIZER_SPARC32 0
+#    define SANITIZER_SPARC64 1
+#  else
+#    define SANITIZER_SPARC32 1
+#    define SANITIZER_SPARC64 0
+#  endif
+#else
+#  define SANITIZER_SPARC 0
+#  define SANITIZER_SPARC32 0
+#  define SANITIZER_SPARC64 0
+#endif
+
 #if defined(__powerpc__)
 #  define SANITIZER_PPC 1
 #  if defined(__powerpc64__)