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authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:34:07 +0000
commit071ea11e85eb9d529cc5eb3d35f6247466a21b99 (patch)
tree5deda65b8d7b04d1f4cbc534c3206d328e1267ec /gdb/nindy-tdep.c
parent1730ec6b1848f0f32154277f788fb29f88d8475b (diff)
downloadppe42-binutils-071ea11e85eb9d529cc5eb3d35f6247466a21b99.tar.gz
ppe42-binutils-071ea11e85eb9d529cc5eb3d35f6247466a21b99.zip
Initial creation of sourceware repository
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-/* Target-machine dependent code for the NINDY monitor running on the Intel 960
- Copyright (C) 1991 Free Software Foundation, Inc.
- Contributed by Intel Corporation.
-
-This file is part of GDB.
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
-/* Miscellaneous NINDY-dependent routines.
- Some replace macros normally defined in "tm.h". */
-
-#include "defs.h"
-#include "symtab.h"
-#include "frame.h"
-#include "gdbcore.h"
-
-/* 'start_frame' is a variable in the NINDY runtime startup routine
- that contains the frame pointer of the 'start' routine (the routine
- that calls 'main'). By reading its contents out of remote memory,
- we can tell where the frame chain ends: backtraces should halt before
- they display this frame. */
-
-int
-nindy_frame_chain_valid (chain, curframe)
- CORE_ADDR chain;
- struct frame_info *curframe;
-{
- struct symbol *sym;
- struct minimal_symbol *msymbol;
-
- /* crtnindy.o is an assembler module that is assumed to be linked
- * first in an i80960 executable. It contains the true entry point;
- * it performs startup up initialization and then calls 'main'.
- *
- * 'sf' is the name of a variable in crtnindy.o that is set
- * during startup to the address of the first frame.
- *
- * 'a' is the address of that variable in 80960 memory.
- */
- static char sf[] = "start_frame";
- CORE_ADDR a;
-
-
- chain &= ~0x3f; /* Zero low 6 bits because previous frame pointers
- contain return status info in them. */
- if ( chain == 0 ){
- return 0;
- }
-
- sym = lookup_symbol(sf, 0, VAR_NAMESPACE, (int *)NULL,
- (struct symtab **)NULL);
- if ( sym != 0 ){
- a = SYMBOL_VALUE (sym);
- } else {
- msymbol = lookup_minimal_symbol (sf, NULL, NULL);
- if (msymbol == NULL)
- return 0;
- a = SYMBOL_VALUE_ADDRESS (msymbol);
- }
-
- return ( chain != read_memory_integer(a,4) );
-}
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