gcc/config/pdp11/2bsd.h

   1 /* Definitions of target machine for GNU compiler, for a PDP with 2BSD
   2    Copyright (C) 1995, 1996, 1999, 2000 Free Software Foundation, Inc.
   3    Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at).
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #define TWO_BSD
  23
  24 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
  25    the stack pointer does not matter.  The value is tested only in
  26    functions that have frame pointers.
  27    No definition is equivalent to always zero.  */
  28
  29 #undef EXIT_IGNORE_STACK
  30 #define EXIT_IGNORE_STACK       1
  31
  32 #undef INITIAL_FRAME_POINTER_OFFSET
  33 #define INITIAL_FRAME_POINTER_OFFSET(DEPTH_VAR) \
  34 {                                                               \
  35   int offset;                                           \
  36   offset = get_frame_size();                                    \
  37   offset = (offset <= 2)? 0: (offset -2);                       \
  38   (DEPTH_VAR) = offset+10;                                              \
  39 }
  40
  41 /* Value should be nonzero if functions must have frame pointers.
  42    Zero means the frame pointer need not be set up (and parms
  43    may be accessed via the stack pointer) in functions that seem suitable.
  44    This is computed in `reload', in reload1.c.
  45   */
  46
  47 #undef FRAME_POINTER_REQUIRED
  48 #define FRAME_POINTER_REQUIRED 1
  49
  50 /* Offset within stack frame to start allocating local variables at.
  51    If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
  52    first local allocated.  Otherwise, it is the offset to the BEGINNING
  53    of the first local allocated.  */
  54 #undef STARTING_FRAME_OFFSET
  55 #define STARTING_FRAME_OFFSET -8
  56
  57
  58 #undef ASM_DECLARE_FUNCTION_NAME
  59 #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL)   \
  60 do {                                                    \
  61 ASM_OUTPUT_LABEL (STREAM, NAME);                        \
  62 fprintf (STREAM, "~~%s:\n", NAME);                      \
  63 } while (0)
  64
  65 #undef TARGET_UNIX_ASM_DEFAULT
  66 #define TARGET_UNIX_ASM_DEFAULT 2048