Re: [patch] C6X unwinding/exception handling

> Index: libjava/exception.cc
> ===================================================================
> --- libjava/exception.cc	(revision 179739)
> +++ libjava/exception.cc	(working copy)
> @@ -135,6 +135,7 @@
>  {
>    _Unwind_Ptr Start;
>    _Unwind_Ptr LPStart;
> +  _Unwind_Ptr ttype_base;
>    const unsigned char *TType;
>    const unsigned char *action_table;
>    unsigned char ttype_encoding;
> @@ -184,7 +185,7 @@
>    _Unwind_Ptr ptr;
> 
>    ptr = (_Unwind_Ptr) (info->TType - (i * 4));
> -  ptr = _Unwind_decode_target2(ptr);
> +  ptr = _Unwind_decode_typeinfo_ptr (info->ttype_base, (_Unwind_Word)
> ptr);
> 
>    return reinterpret_cast<void **>(ptr);
>  }
> @@ -325,6 +326,7 @@
> 
>    // Parse the LSDA header.
>    p = parse_lsda_header (context, language_specific_data, &info);
> +  info.ttype_base = base_of_encoded_value (info.ttype_encoding, context);
>  #ifdef HAVE_GETIPINFO
>    ip = _Unwind_GetIPInfo (context, &ip_before_insn);
>  #else

No.  The purpose of my patch was to remove the arm specific code.

The only difference I can see in this bit of code is that libstdc++ uses 
base_of_encoded_value/read_encoded_value_with_base whereas libjava uses 
context/read_encoded_value.

I expect you want something like the patch below (completely untested).

Paul

Index: exception.cc
===================================================================
--- exception.cc	(revision 178906)
+++ exception.cc	(working copy)
@@ -161,6 +161,11 @@ parse_lsda_header (_Unwind_Context *cont
   info->ttype_encoding = *p++;
   if (info->ttype_encoding != DW_EH_PE_omit)
     {
+#if _GLIBCXX_OVERRIDE_TTYPE_ENCODING
+      /* Older ARM EABI toolchains set this value incorrectly, so use a
+        hardcoded OS-specific format.  */
+      info->ttype_encoding = _GLIBCXX_OVERRIDE_TTYPE_ENCODING;
+#endif
       p = read_uleb128 (p, &tmp);
       info->TType = p + tmp;
     }
@@ -176,21 +181,6 @@ parse_lsda_header (_Unwind_Context *cont
   return p;
 }
 
-#ifdef __ARM_EABI_UNWINDER__
-
-static void **
-get_ttype_entry(_Unwind_Context *, lsda_header_info* info, _uleb128_t i)
-{
-  _Unwind_Ptr ptr;
-
-  ptr = (_Unwind_Ptr) (info->TType - (i * 4));
-  ptr = _Unwind_decode_target2(ptr);
-  
-  return reinterpret_cast<void **>(ptr);
-}
-
-#else
-
 static void **
 get_ttype_entry (_Unwind_Context *context, lsda_header_info *info, long i)
 {
@@ -202,8 +192,6 @@ get_ttype_entry (_Unwind_Context *contex
   return reinterpret_cast<void **>(ptr);
 }
 
-#endif
-
 // Using a different personality function name causes link failures
 // when trying to mix code using different exception handling models.
 #ifdef SJLJ_EXCEPTIONS