re PR sanitizer/64435 (Bootstrap failure in libsanitizer on AArch64 with Linux kernel <= 3.15)

	PR sanitizer/64435
	* sanitizer_common/sanitizer_platform_limits_posix.h: Cherry pick
	upstream r226637.
	* sanitizer_common/sanitizer_platform_limits_posix.cc: Likewise.
	* sanitizer_common/sanitizer_posix.cc: Cherry pick upstream r226639.

From-SVN: r219968

libsanitizer/ChangeLog

+2015-01-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR sanitizer/64435
+	* sanitizer_common/sanitizer_platform_limits_posix.h: Cherry pick
+	upstream r226637.
+	* sanitizer_common/sanitizer_platform_limits_posix.cc: Likewise.
+	* sanitizer_common/sanitizer_posix.cc: Cherry pick upstream r226639.
+
 2015-01-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR sanitizer/64632

libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc

@@ -1059,7 +1059,13 @@ CHECK_SIZE_AND_OFFSET(ipc_perm, uid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
+#ifndef __GLIBC_PREREQ
+#define __GLIBC_PREREQ(x, y) 0
+#endif
+#if !defined(__aarch64__) || !SANITIZER_LINUX || __GLIBC_PREREQ (2, 21)
+/* On aarch64 glibc 2.20 and earlier provided incorrect mode field.  */
 CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
+#endif
 
 CHECK_TYPE_SIZE(shmid_ds);
 CHECK_SIZE_AND_OFFSET(shmid_ds, shm_perm);

libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h

@@ -167,7 +167,7 @@ namespace __sanitizer {
     unsigned __seq;
     u64 __unused1;
     u64 __unused2;
-#elif defined(__mips__)
+#elif defined(__mips__) || defined(__aarch64__)
     unsigned int mode;
     unsigned short __seq;
     unsigned short __pad1;

libsanitizer/sanitizer_common/sanitizer_posix.cc

@@ -76,16 +76,15 @@ static uptr GetKernelAreaSize() {
 
 uptr GetMaxVirtualAddress() {
 #if SANITIZER_WORDSIZE == 64
-# if defined(__powerpc64__)
+# if defined(__powerpc64__) || defined(__aarch64__)
   // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
   // We somehow need to figure out which one we are using now and choose
   // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
   // Note that with 'ulimit -s unlimited' the stack is moved away from the top
   // of the address space, so simply checking the stack address is not enough.
   // This should (does) work for both PowerPC64 Endian modes.
+  // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
   return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
-# elif defined(__aarch64__)
-  return (1ULL << 39) - 1;
 # elif defined(__mips64)
   return (1ULL << 40) - 1;
 # else