Initial revision

1 files changed, 74 insertions, 0 deletions

diff --git a/gdb/nindy-tdep.c b/gdb/nindy-tdep.c
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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) );
+}