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[/] [or1k/] [trunk/] [insight/] [gdb/] [nindy-tdep.c] - Blame information for rev 578

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1 578 markom
/* Target-machine dependent code for the NINDY monitor running on the Intel 960
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   Copyright 1991, 1992, 1993, 1994, 1995, 1996, 2000
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   Free Software Foundation, Inc.
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   Contributed by Intel Corporation.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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/* Miscellaneous NINDY-dependent routines.
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   Some replace macros normally defined in "tm.h".  */
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#include "defs.h"
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#include "symtab.h"
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#include "frame.h"
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#include "gdbcore.h"
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/* 'start_frame' is a variable in the NINDY runtime startup routine
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   that contains the frame pointer of the 'start' routine (the routine
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   that calls 'main').  By reading its contents out of remote memory,
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   we can tell where the frame chain ends:  backtraces should halt before
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   they display this frame.  */
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int
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nindy_frame_chain_valid (CORE_ADDR chain, struct frame_info *curframe)
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{
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  struct symbol *sym;
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  struct minimal_symbol *msymbol;
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  /* crtnindy.o is an assembler module that is assumed to be linked
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   * first in an i80960 executable.  It contains the true entry point;
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   * it performs startup up initialization and then calls 'main'.
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   *
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   * 'sf' is the name of a variable in crtnindy.o that is set
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   *      during startup to the address of the first frame.
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   *
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   * 'a' is the address of that variable in 80960 memory.
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   */
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  static char sf[] = "start_frame";
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  CORE_ADDR a;
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  chain &= ~0x3f;               /* Zero low 6 bits because previous frame pointers
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                                   contain return status info in them.  */
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  if (chain == 0)
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    {
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      return 0;
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    }
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  sym = lookup_symbol (sf, 0, VAR_NAMESPACE, (int *) NULL,
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                       (struct symtab **) NULL);
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  if (sym != 0)
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    {
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      a = SYMBOL_VALUE (sym);
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    }
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  else
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    {
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      msymbol = lookup_minimal_symbol (sf, NULL, NULL);
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      if (msymbol == NULL)
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        return 0;
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      a = SYMBOL_VALUE_ADDRESS (msymbol);
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    }
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  return (chain != read_memory_integer (a, 4));
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}

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