linux-unwind.h (aarch64_fallback_frame_state): Check for correct opcodes on BE.

2013-11-26  Matthew Leach  <matthew.leach@arm.com>

	* config/aarch64/linux-unwind.h (aarch64_fallback_frame_state):	Check
	for correct opcodes on BE.

From-SVN: r205479

libgcc/ChangeLog

+2013-11-26  Matthew Leach  <matthew.leach@arm.com>
+
+	* config/aarch64/linux-unwind.h (aarch64_fallback_frame_state):	Check
+	for correct opcodes on BE.
+
 2013-11-27  Uros Bizjak  <ubizjak@gmail.com>
 
 	* soft-fp/op-4.h: Update from glibc.

libgcc/config/aarch64/linux-unwind.h

@@ -25,6 +25,19 @@
 #include <signal.h>
 #include <sys/ucontext.h>
 
+
+/* Since insns are always stored LE, on a BE system the opcodes will
+   be loaded byte-reversed.  Therefore, define two sets of opcodes,
+   one for LE and one for BE.  */
+
+#if __AARCH64EB__
+#define MOVZ_X8_8B	0x681180d2
+#define SVC_0		0x010000d4
+#else
+#define MOVZ_X8_8B	0xd2801168
+#define SVC_0		0xd4000001
+#endif
+
 #define MD_FALLBACK_FRAME_STATE_FOR aarch64_fallback_frame_state
 
 static _Unwind_Reason_Code
@@ -55,7 +68,7 @@ aarch64_fallback_frame_state (struct _Unwind_Context *context,
      0xd2801168         movz x8, #0x8b
      0xd4000001         svc  0x0
    */
-  if (pc[0] != 0xd2801168 || pc[1] != 0xd4000001)
+  if (pc[0] != MOVZ_X8_8B || pc[1] != SVC_0)
     {
       return _URC_END_OF_STACK;
     }