From dd3b648e8b12ceb7bfce66e7f179b671403aea9c Mon Sep 17 00:00:00 2001 From: "K. Richard Pixley" Date: Thu, 28 Mar 1991 16:28:29 +0000 Subject: Johns release --- gdb/nindy-tdep.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 gdb/nindy-tdep.c (limited to 'gdb/nindy-tdep.c') diff --git a/gdb/nindy-tdep.c b/gdb/nindy-tdep.c new file mode 100644 index 0000000000..b609fd7971 --- /dev/null +++ b/gdb/nindy-tdep.c @@ -0,0 +1,77 @@ +/* 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 1, 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; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Miscellaneous NINDY-dependent routines. + Some replace macros normally defined in "tm.h". */ + +#include +#include "defs.h" +#include "param.h" +#include "symtab.h" +#include "frame.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) + unsigned int chain; + FRAME curframe; +{ + struct symbol *sym; + int i; + + /* 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 = sym->value.value; + } else { + for ( i = 0; strcmp(misc_function_vector[i].name,sf); i++ ){ + if ( i >= misc_function_count ){ + return 0; + } + } + a = misc_function_vector[i].address; + } + + return ( chain != read_memory_integer(a,4) ); +} -- cgit v1.2.1