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From: "Boris Vrbaniæ" <boris DOT vrbanic AT hi DOT hinet DOT hr>
Newsgroups: comp.os.msdos.djgpp
Subject: Question about "unwind-dw2.c"
Date: Mon, 13 May 2002 06:51:08 +0200
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Question is about following structure - reg field - and two functions
dealing with it:


struct _Unwind_Context
{
  void *reg[DWARF_FRAME_REGISTERS+1];
  void *cfa;
  void *ra;
  void *lsda;
  struct dwarf_eh_bases bases;
  _Unwind_Word args_size;
};

inline _Unwind_Word
_Unwind_GetGR (struct _Unwind_Context *context, int index)
{
  /* This will segfault if the register hasn't been saved.  */
  return * (_Unwind_Word *) context->reg[index];
}

inline void
_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
{
  * (_Unwind_Word *) context->reg[index] = val;
}



And the question is:

which function and at what point of exception handling is
responsible of filling reg pointers?

eh_personality function is writting to reg 0 and 1 but address
is NULL and that causes page fault in my OS  (I am trying to implement
libsupc++ library). I have spent entire week to figure out how it works
or should work - but nothing helped...

Can anyone help me? Please!!!