Initial revision

From-SVN: r10206

gcc/config/pdp11/2bsd.h

+/* Definitions of target machine for GNU compiler, for a PDP with 2BSD
+   Copyright (C) 1995 Free Software Foundation, Inc.
+   Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at).
+
+This file is part of GNU CC.
+
+GNU CC 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.
+
+GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "pdp11/pdp11.h"
+
+/* This macro generates the assembly code for function entry. */
+#undef FUNCTION_PROLOGUE
+#define FUNCTION_PROLOGUE(FILE, SIZE) \
+do {									\
+fprintf(FILE, "\tjsr	r5, csv\n");					\
+if ((SIZE) != 0)							\
+  {									\
+    fprintf(FILE, "\t/*abuse empty parameter slot for locals!*/\n");	\
+    if ((SIZE) > 2)							\
+      fprintf(FILE, "\tsub $%d, sp\n", (SIZE)-2);			\
+  };									\
+} while (0)
+
+/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
+   the stack pointer does not matter.  The value is tested only in
+   functions that have frame pointers.
+   No definition is equivalent to always zero.  */
+
+#undef EXIT_IGNORE_STACK
+#define EXIT_IGNORE_STACK	1
+
+/* This macro generates the assembly code for function exit,
+   on machines that need it.  If FUNCTION_EPILOGUE is not defined
+   then individual return instructions are generated for each
+   return statement.  Args are same as for FUNCTION_PROLOGUE.
+*/
+
+#undef FUNCTION_EPILOGUE
+#define FUNCTION_EPILOGUE(FILE, SIZE) \
+do {                                                                    \
+fprintf(FILE, "\t/* SP ignored by cret? */\n");     			\
+fprintf(FILE, "\tjmp cret\n");                                    	\
+} while (0)
+
+#undef INITIAL_FRAME_POINTER_OFFSET  
+#define INITIAL_FRAME_POINTER_OFFSET(DEPTH_VAR)	\
+{								\
+  int offset, regno;		      				\
+  offset = get_frame_size();					\
+  offset = (offset <= 2)? 0: (offset -2);			\
+  (DEPTH_VAR) = offset+10;						\
+}   
+
+/* Value should be nonzero if functions must have frame pointers.
+   Zero means the frame pointer need not be set up (and parms
+   may be accessed via the stack pointer) in functions that seem suitable.
+   This is computed in `reload', in reload1.c.
+  */
+
+#undef FRAME_POINTER_REQUIRED 
+#define FRAME_POINTER_REQUIRED 1
+
+/* Offset within stack frame to start allocating local variables at.
+   If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
+   first local allocated.  Otherwise, it is the offset to the BEGINNING
+   of the first local allocated.  */
+#undef STARTING_FRAME_OFFSET
+#define STARTING_FRAME_OFFSET -8
+
+
+#undef ASM_DECLARE_FUNCTION_NAME
+#define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)	\
+do {							\
+ASM_OUTPUT_LABEL (STREAM, NAME);			\
+fprintf (STREAM, "~~%s:\n", NAME); 			\
+} while (0)