AArch64: Use negative values in error enumeration

With AArch64 the enumerations with values in the range
0x80000000 to 0x80000007 are being assigned to ssize_t
typed variables which are 64-bit rather than 32-bit, and
are being used in conditions where they are being checked
for being negative. This is not the case when ssize_t is
64-bit, so redefine this to INT32_MIN value.

Change-Id: I7a031a940a28658b3bf34bebac93dfb3ba397b05
Signed-off-by: Marcus Oakland <marcus.oakland@arm.com>
Signed-off-by: Ashok Bhat <ashok.bhat@arm.com>

include/utils/Errors.h

@@ -41,23 +41,23 @@ typedef int32_t     status_t;
 #ifdef _WIN32
 # undef NO_ERROR
 #endif
- 
+
 enum {
     OK                = 0,    // Everything's swell.
     NO_ERROR          = 0,    // No errors.
-    
-    UNKNOWN_ERROR       = 0x80000000,
+
+    UNKNOWN_ERROR       = (-2147483647-1), // INT32_MIN value
 
     NO_MEMORY           = -ENOMEM,
     INVALID_OPERATION   = -ENOSYS,
     BAD_VALUE           = -EINVAL,
-    BAD_TYPE            = 0x80000001,
+    BAD_TYPE            = (UNKNOWN_ERROR + 1),
     NAME_NOT_FOUND      = -ENOENT,
     PERMISSION_DENIED   = -EPERM,
     NO_INIT             = -ENODEV,
     ALREADY_EXISTS      = -EEXIST,
     DEAD_OBJECT         = -EPIPE,
-    FAILED_TRANSACTION  = 0x80000002,
+    FAILED_TRANSACTION  = (UNKNOWN_ERROR + 2),
     JPARKS_BROKE_IT     = -EPIPE,
 #if !defined(HAVE_MS_C_RUNTIME)
     BAD_INDEX           = -EOVERFLOW,
@@ -67,12 +67,12 @@ enum {
     UNKNOWN_TRANSACTION = -EBADMSG,
 #else    
     BAD_INDEX           = -E2BIG,
-    NOT_ENOUGH_DATA     = 0x80000003,
-    WOULD_BLOCK         = 0x80000004,
-    TIMED_OUT           = 0x80000005,
-    UNKNOWN_TRANSACTION = 0x80000006,
+    NOT_ENOUGH_DATA     = (UNKNOWN_ERROR + 3),
+    WOULD_BLOCK         = (UNKNOWN_ERROR + 4),
+    TIMED_OUT           = (UNKNOWN_ERROR + 5),
+    UNKNOWN_TRANSACTION = (UNKNOWN_ERROR + 6),
 #endif    
-    FDS_NOT_ALLOWED     = 0x80000007,
+    FDS_NOT_ALLOWED     = (UNKNOWN_ERROR + 7),
 };
 
 // Restore define; enumeration is in "android" namespace, so the value defined