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Annotation of gcc/config/tti68k.h, revision 1.1

1.1     ! root        1: /* Definitions of target machine for GNU compiler.
        !             2: 
        !             3:    Citicorp/TTI Unicom PBB version
        !             4:    (using GAS and encapsulated COFF)
        !             5: 
        !             6:    Copyright (C) 1987, 1988, 1990 Free Software Foundation, Inc.
        !             7: 
        !             8: This file is part of GNU CC.
        !             9: 
        !            10: GNU CC is free software; you can redistribute it and/or modify
        !            11: it under the terms of the GNU General Public License as published by
        !            12: the Free Software Foundation; either version 2, or (at your option)
        !            13: any later version.
        !            14: 
        !            15: GNU CC is distributed in the hope that it will be useful,
        !            16: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            17: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            18: GNU General Public License for more details.
        !            19: 
        !            20: You should have received a copy of the GNU General Public License
        !            21: along with GNU CC; see the file COPYING.  If not, write to
        !            22: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            23: 
        !            24: #include "m68k.h"
        !            25: 
        !            26: /* Without STRUCTURE_SIZE_BOUNDARY, we can't ensure that structures are
        !            27:    aligned such that we can correctly extract bitfields from them.
        !            28:    Someone should check whether the usual compiler on this machine
        !            29:    provides the equivalent behavior of STRUCTURE_SIZE_BOUNDARY.  */
        !            30: /* Alternative solutions are (1) define PCC_BITFIELD_TYPE_MATTERS,
        !            31:    if that fits what the usual compiler does,
        !            32:    or disable the -m68000 and -mnobitfield options.  */
        !            33: #error This doesn't define STRUCTURE_SIZE_BOUNDARY
        !            34: 
        !            35: /* See m68k.h.  5 means 68020 without 68881.  */
        !            36: 
        !            37: #define TARGET_DEFAULT 5
        !            38: 
        !            39: /* Define __HAVE_68881__ in preprocessor if -m68881 is specified.
        !            40:    This will control the use of inline 68881 insns in certain macros.  */
        !            41: 
        !            42: #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
        !            43: 
        !            44: /* Since some host machines will have to avoid generating code that
        !            45:    knows the format of floating point numbers on the tti68K,
        !            46:    we force all of them to avoid it when compiling for this
        !            47:    target, so that they will all generate exactly the same assembler
        !            48:    code as a result.  Otherwise code cross-hosted from a Vax would
        !            49:    differ from native-compiled code.  The performance penalty should
        !            50:    be minor in most cases.  Note that we still do constant folding
        !            51:    in the host float format, so things might be a few bits off here
        !            52:    or there.  */
        !            53: 
        !            54: #define        CAN_EXAMINE_68K_REAL_GUTS       0
        !            55: 
        !            56: /* Names to predefine in the preprocessor for this target machine.  */
        !            57: 
        !            58: #define CPP_PREDEFINES "-Dm68k -Dunix -DUnicomPBB -Dmc68k -Dmc68020 -Dmc68k32"
        !            59: 
        !            60: /* We want DBX format for use with gdb under encapsulated coff.  */
        !            61: 
        !            62: #define DBX_DEBUGGING_INFO
        !            63: 
        !            64: /* Generate calls to memcpy, memcmp and memset.  */
        !            65: 
        !            66: #define TARGET_MEM_FUNCTIONS
        !            67: 
        !            68: /* -m68000 requires special flags to the assembler.  */
        !            69: 
        !            70: #define ASM_SPEC \
        !            71:  "%{m68000:-mc68010}%{mc68000:-mc68010}"
        !            72: 
        !            73: /* we use /lib/libp/lib*  when profiling */
        !            74: 
        !            75: #define LIB_SPEC "%{!shlib:%{p:-L/lib/libp} %{pg:-L/lib/libp} -lc}"
        !            76: 
        !            77: /* shared libraries need to use crt1.o  */
        !            78: 
        !            79: /*#define STARTFILE_SPEC*/
        !            80: #define STARTFILE_SPEC \
        !            81:   "%{!shlib:%{pg:mcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}\
        !            82:    %{shlib:crt1.o%s shlib.ifile%s} "
        !            83: 
        !            84: /* cpp has to support a #sccs directive for the /usr/include files */
        !            85: 
        !            86: #define SCCS_DIRECTIVE
        !            87: 
        !            88: /* Define subroutines to call to handle multiply, divide, and remainder.
        !            89:    Use the subroutines that the 3b1's library provides.
        !            90:    The `*' prevents an underscore from being prepended by the compiler.  */
        !            91: 
        !            92: #ifdef notnow
        !            93: #define DIVSI3_LIBCALL "*ldiv"
        !            94: #define UDIVSI3_LIBCALL "*uldiv"
        !            95: #define MODSI3_LIBCALL "*lrem"
        !            96: #define UMODSI3_LIBCALL "*ulrem"
        !            97: #define MULSI3_LIBCALL "*lmul"
        !            98: #define UMULSI3_LIBCALL "*ulmul"
        !            99: #endif
        !           100: 
        !           101: #ifndef __GNUC__
        !           102: #define USE_C_ALLOCA
        !           103: #endif
        !           104: 
        !           105: /* Return pointer values in both d0 and a0.  */
        !           106: 
        !           107: #undef FUNCTION_EXTRA_EPILOGUE
        !           108: #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)                    \
        !           109: {                                                              \
        !           110:   extern int current_function_returns_pointer;                 \
        !           111:   if ((current_function_returns_pointer) &&                    \
        !           112:       ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))\
        !           113:     fprintf (FILE, "\tmovel d0,a0\n");                         \
        !           114: }

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