74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/* 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"
|
|
|
|
/* '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;
|
|
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) );
|
|
}
|