87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/* Definitions of target machine for GNU compiler, for a PDP with 2BSD
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at).
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This macro generates the assembly code for function entry. */
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#undef FUNCTION_PROLOGUE
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#define FUNCTION_PROLOGUE(FILE, SIZE) \
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do { \
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fprintf(FILE, "\tjsr r5, csv\n"); \
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if ((SIZE) != 0) \
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{ \
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fprintf(FILE, "\t/*abuse empty parameter slot for locals!*/\n"); \
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if ((SIZE) > 2) \
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fprintf(FILE, "\tsub $%d, sp\n", (SIZE)-2); \
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}; \
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} while (0)
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/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
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the stack pointer does not matter. The value is tested only in
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functions that have frame pointers.
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No definition is equivalent to always zero. */
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#undef EXIT_IGNORE_STACK
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#define EXIT_IGNORE_STACK 1
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/* This macro generates the assembly code for function exit,
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on machines that need it. If FUNCTION_EPILOGUE is not defined
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then individual return instructions are generated for each
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return statement. Args are same as for FUNCTION_PROLOGUE.
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*/
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#undef FUNCTION_EPILOGUE
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#define FUNCTION_EPILOGUE(FILE, SIZE) \
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do { \
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fprintf(FILE, "\t/* SP ignored by cret? */\n"); \
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fprintf(FILE, "\tjmp cret\n"); \
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} while (0)
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#undef INITIAL_FRAME_POINTER_OFFSET
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#define INITIAL_FRAME_POINTER_OFFSET(DEPTH_VAR) \
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{ \
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int offset, regno; \
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offset = get_frame_size(); \
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offset = (offset <= 2)? 0: (offset -2); \
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(DEPTH_VAR) = offset+10; \
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}
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/* Value should be nonzero if functions must have frame pointers.
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Zero means the frame pointer need not be set up (and parms
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may be accessed via the stack pointer) in functions that seem suitable.
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This is computed in `reload', in reload1.c.
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*/
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#undef FRAME_POINTER_REQUIRED
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#define FRAME_POINTER_REQUIRED 1
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/* Offset within stack frame to start allocating local variables at.
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If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
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first local allocated. Otherwise, it is the offset to the BEGINNING
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of the first local allocated. */
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#undef STARTING_FRAME_OFFSET
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#define STARTING_FRAME_OFFSET -8
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#undef ASM_DECLARE_FUNCTION_NAME
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#define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL) \
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do { \
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ASM_OUTPUT_LABEL (STREAM, NAME); \
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fprintf (STREAM, "~~%s:\n", NAME); \
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} while (0)
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