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Date:      Sat, 31 Aug 2013 14:53:19 +0000 (UTC)
From:      Andrew Turner <andrew@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r255095 - head/contrib/gcc/config/arm
Message-ID:  <201308311453.r7VErJHV028236@svn.freebsd.org>
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Author: andrew
Date: Sat Aug 31 14:53:19 2013
New Revision: 255095
URL: http://svnweb.freebsd.org/changeset/base/255095

Log:
  Bring in gcc r128087 to add support for _Unwind_Backtrace on ARM. This is
  prior to the licence change so is under the GPLv2.

Modified:
  head/contrib/gcc/config/arm/libunwind.S
  head/contrib/gcc/config/arm/unwind-arm.c
  head/contrib/gcc/config/arm/unwind-arm.h

Modified: head/contrib/gcc/config/arm/libunwind.S
==============================================================================
--- head/contrib/gcc/config/arm/libunwind.S	Sat Aug 31 13:41:20 2013	(r255094)
+++ head/contrib/gcc/config/arm/libunwind.S	Sat Aug 31 14:53:19 2013	(r255095)
@@ -116,5 +116,6 @@ UNWIND_WRAPPER _Unwind_RaiseException 1
 UNWIND_WRAPPER _Unwind_Resume 1
 UNWIND_WRAPPER _Unwind_Resume_or_Rethrow 1
 UNWIND_WRAPPER _Unwind_ForcedUnwind 3
+UNWIND_WRAPPER _Unwind_Backtrace 2
 
-#endif  /* __symbian__ */
+#endif  /* ndef __symbian__ */

Modified: head/contrib/gcc/config/arm/unwind-arm.c
==============================================================================
--- head/contrib/gcc/config/arm/unwind-arm.c	Sat Aug 31 13:41:20 2013	(r255094)
+++ head/contrib/gcc/config/arm/unwind-arm.c	Sat Aug 31 14:53:19 2013	(r255095)
@@ -747,6 +747,66 @@ _Unwind_DeleteException (_Unwind_Excepti
 }
 
 
+/* Perform stack backtrace through unwind data.  */
+_Unwind_Reason_Code
+__gnu_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument,
+		       phase2_vrs * entry_vrs);
+_Unwind_Reason_Code
+__gnu_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument,
+		       phase2_vrs * entry_vrs)
+{
+  phase1_vrs saved_vrs;
+  _Unwind_Reason_Code code;
+
+  _Unwind_Control_Block ucb;
+  _Unwind_Control_Block *ucbp = &ucb;
+
+  /* Set the pc to the call site.  */
+  entry_vrs->core.r[R_PC] = entry_vrs->core.r[R_LR];
+
+  /* Save the core registers.  */
+  saved_vrs.core = entry_vrs->core;
+  /* Set demand-save flags.  */
+  saved_vrs.demand_save_flags = ~(_uw) 0;
+  
+  do
+    {
+      /* Find the entry for this routine.  */
+      if (get_eit_entry (ucbp, saved_vrs.core.r[R_PC]) != _URC_OK)
+	{
+	  code = _URC_FAILURE;
+	  break;
+	}
+
+      /* The dwarf unwinder assumes the context structure holds things
+	 like the function and LSDA pointers.  The ARM implementation
+	 caches these in the exception header (UCB).  To avoid
+	 rewriting everything we make the virtual IP register point at
+	 the UCB.  */
+      _Unwind_SetGR((_Unwind_Context *)&saved_vrs, 12, (_Unwind_Ptr) ucbp);
+
+      /* Call trace function.  */
+      if ((*trace) ((_Unwind_Context *) &saved_vrs, trace_argument) 
+	  != _URC_NO_REASON)
+	{
+	  code = _URC_FAILURE;
+	  break;
+	}
+
+      /* Call the pr to decide what to do.  */
+      code = ((personality_routine) UCB_PR_ADDR (ucbp))
+	(_US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND, 
+	 ucbp, (void *) &saved_vrs);
+    }
+  while (code != _URC_END_OF_STACK
+	 && code != _URC_FAILURE);
+
+ finish:
+  restore_non_core_regs (&saved_vrs);
+  return code;
+}
+
+
 /* Common implementation for ARM ABI defined personality routines.
    ID is the index of the personality routine, other arguments are as defined
    by __aeabi_unwind_cpp_pr{0,1,2}.  */

Modified: head/contrib/gcc/config/arm/unwind-arm.h
==============================================================================
--- head/contrib/gcc/config/arm/unwind-arm.h	Sat Aug 31 13:41:20 2013	(r255094)
+++ head/contrib/gcc/config/arm/unwind-arm.h	Sat Aug 31 14:53:19 2013	(r255095)
@@ -205,6 +205,13 @@ extern "C" {
 	_Unwind_Control_Block *, struct _Unwind_Context *, void *);
   _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,
 					    _Unwind_Stop_Fn, void *);
+  /* @@@ Use unwind data to perform a stack backtrace.  The trace callback
+     is called for every stack frame in the call chain, but no cleanup
+     actions are performed.  */
+  typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (_Unwind_Context *, void *);
+  _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn,
+					void*);
+
   _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
   void _Unwind_Complete(_Unwind_Control_Block *ucbp);
   void _Unwind_DeleteException (_Unwind_Exception *);

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