Use frame pointer to walk ARM stack on iOS.

Review URL: http://breakpad.appspot.com/314001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@869 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/stackwalker.cc

@@ -44,6 +44,7 @@
 #include "google_breakpad/processor/source_line_resolver_interface.h"
 #include "google_breakpad/processor/stack_frame.h"
 #include "google_breakpad/processor/symbol_supplier.h"
+#include "google_breakpad/processor/system_info.h"
 #include "processor/linked_ptr.h"
 #include "processor/logging.h"
 #include "processor/scoped_ptr.h"
@@ -187,10 +188,13 @@ Stackwalker* Stackwalker::StackwalkerForCPU(
       break;
 
     case MD_CONTEXT_ARM:
+      int fp_register = -1;
+      if (system_info->os_short == "ios")
+        fp_register = MD_CONTEXT_ARM_REG_IOS_FP;
       cpu_stackwalker = new StackwalkerARM(system_info,
                                            context->GetContextARM(),
-                                           memory, modules, supplier,
-                                           resolver);
+					   fp_register, memory, modules,
+					   supplier, resolver);
       break;
   }