aix-unwind.h (ucontext_for): Handle AIX 7.1 specificities.

2016-01-05  Olivier Hainque  <hainque@adacore.com>

	* config/rs6000/aix-unwind.h (ucontext_for): Handle AIX 7.1
	specificities.

From-SVN: r232082

libgcc/ChangeLog

+2016-01-05  Olivier Hainque  <hainque@adacore.com>
+
+	* config/rs6000/aix-unwind.h (ucontext_for): Handle AIX 7.1
+	specificities. 
+
 2016-01-04  Jakub Jelinek  <jakub@redhat.com>
 
 	Update copyright years.

libgcc/config/rs6000/aix-unwind.h

@@ -64,7 +64,7 @@
 #endif
 
 /* Now on to MD_FALLBACK_FRAME_STATE_FOR.
-   32bit AIX 5.2 and 5.3 only at this stage.  */
+   32bit AIX 5.2, 5.3 and 7.1 only at this stage.  */
 
 #include <stdlib.h>
 #include <stddef.h>
@@ -128,8 +128,9 @@ ucontext_for (struct _Unwind_Context *context)
 {
   const unsigned int * ra = context->ra;
 
-  /* AIX 5.2 and 5.3, threaded or not, share common patterns and feature
-     variants depending on the configured kernel (unix_mp or unix_64).  */
+  /* AIX 5.2, 5.3 and 7.1, threaded or not, share common patterns
+     and feature variants depending on the configured kernel (unix_mp
+     or unix_64).  */
 
   if (*(ra - 5) == 0x4c00012c     /* isync             */
       && *(ra - 4) == 0x80ec0000  /* lwz     r7,0(r12) */
@@ -150,6 +151,10 @@ ucontext_for (struct _Unwind_Context *context)
 	      /* AIX 5.3 */
 	    case 0x835a0570:  /* lwz r26,1392(r26) */
 	      return (ucontext_t *)(context->cfa + 0x40);
+
+	      /* AIX 7.1 */
+	    case 0x2c1a0000:  /* cmpwi   r26,0 */
+	      return (ucontext_t *)(context->cfa + 0x40);
 		
 	    default:
 	      return 0;