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/* Target-machine dependent code for the NINDY monitor running on the Intel 960
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Copyright (C) 1991 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 (chain, curframe)
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CORE_ADDR chain;
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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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