Revert 126715 - Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/malloc_hook_mmap_linux.h

 // Copyright (c) 2005, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 
 #include <unistd.h>
 #include <syscall.h>
 #include <sys/mman.h>
 #include <errno.h>
 #include "base/linux_syscall_support.h"
 
 // The x86-32 case and the x86-64 case differ:
 // 32b has a mmap2() syscall, 64b does not.
 // 64b and 32b have different calling conventions for mmap().
-
-// I test for 64-bit first so I don't have to do things like
-// '#if (defined(__mips__) && !defined(__MIPS64__))' as a mips32 check.
-#if defined(__x86_64__) || defined(__PPC64__) || (defined(_MIPS_SIM) && _MIPS_SIM == _ABI64)
-
-static inline void* do_mmap64(void *start, size_t length,
-                              int prot, int flags,
-                              int fd, __off64_t offset) __THROW {
-  return sys_mmap(start, length, prot, flags, fd, offset);
-}
-
-#define MALLOC_HOOK_HAVE_DO_MMAP64 1
-
-#elif defined(__i386__) || defined(__PPC__) || defined(__mips__) || \
-      defined(__arm__)
+#if defined(__i386__) || defined(__PPC__)
 
 static inline void* do_mmap64(void *start, size_t length,
                               int prot, int flags,
                               int fd, __off64_t offset) __THROW {
   void *result;
 
   // Try mmap2() unless it's not supported
   static bool have_mmap2 = true;
   if (have_mmap2) {
     static int pagesize = 0;
@@ skipping 16 matching lines @@
   }
 
   if (((off_t)offset) != offset) {
     // If we're trying to map a 64-bit offset, fail now since we don't
     // have 64-bit mmap() support.
     result = MAP_FAILED;
     errno = EINVAL;
     goto out;
   }
 
-#ifdef __NR_mmap
   {
     // Fall back to old 32-bit offset mmap() call
     // Old syscall interface cannot handle six args, so pass in an array
-    int32 args[6] = { (int32) start, (int32) length, prot, flags, fd,
-                      (off_t) offset };
+    int32 args[6] = { (int32) start, length, prot, flags, fd, (off_t) offset };
     result = (void *)syscall(SYS_mmap, args);
   }
-#else
-  // Some Linux ports like ARM EABI Linux has no mmap, just mmap2.
-  result = MAP_FAILED;
-#endif
-
  out:
   return result;
 }
 
 #define MALLOC_HOOK_HAVE_DO_MMAP64 1
 
-#endif  // #if defined(__x86_64__)
+#elif defined(__x86_64__) || defined(__PPC64__)  // #if defined(__i386__) || ...
+
+static inline void* do_mmap64(void *start, size_t length,
+                              int prot, int flags,
+                              int fd, __off64_t offset) __THROW {
+  return (void *)syscall(SYS_mmap, start, length, prot, flags, fd, offset);
+}
+
+#define MALLOC_HOOK_HAVE_DO_MMAP64 1
+
+#endif  // #if defined(__i386__) || defined(__PPC__)
 
 
 #ifdef MALLOC_HOOK_HAVE_DO_MMAP64
 
 // We use do_mmap64 abstraction to put MallocHook::InvokeMmapHook
 // calls right into mmap and mmap64, so that the stack frames in the caller's
 // stack are at the same offsets for all the calls of memory allocating
 // functions.
 
 // Put all callers of MallocHook::Invoke* in this module into
@@ skipping 93 matching lines @@
   int result;
   if (!MallocHook::InvokeMunmapReplacement(start, length, &result)) {
     result = syscall(SYS_munmap, start, length);
   }
   return result;
 }
 
 #undef MALLOC_HOOK_HAVE_DO_MMAP64
 
 #endif  // #ifdef MALLOC_HOOK_HAVE_DO_MMAP64