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Annotation of gcc/config/apollo68.h, revision 1.1

1.1     ! root        1: /* Definitions of target machine for GNU compiler.  Apollo 680X0 version.
        !             2:    Copyright (C) 1989 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: #include "m68k.h"
        !            21: 
        !            22: /* This symbol may be tested in other files for special Apollo handling */
        !            23: 
        !            24: #define TM_APOLLO
        !            25: 
        !            26: /* See m68k.h.  7 means 68020 with 68881.  */
        !            27: 
        !            28: #ifndef TARGET_DEFAULT
        !            29: #define TARGET_DEFAULT 7
        !            30: #endif
        !            31: 
        !            32: /* Target switches for the Apollo is the same as in m68k.h, except
        !            33:    there is no Sun FPA. */
        !            34: 
        !            35: #undef TARGET_SWITCHES
        !            36: #define TARGET_SWITCHES  \
        !            37:   { { "68020", 5},                             \
        !            38:     { "c68020", 5},                            \
        !            39:     { "68881", 2},                             \
        !            40:     { "bitfield", 4},                          \
        !            41:     { "68000", -5},                            \
        !            42:     { "c68000", -5},                           \
        !            43:     { "soft-float", -0102},                    \
        !            44:     { "nobitfield", -4},                       \
        !            45:     { "rtd", 8},                               \
        !            46:     { "nortd", -8},                            \
        !            47:     { "short", 040},                           \
        !            48:     { "noshort", -040},                                \
        !            49:     { "", TARGET_DEFAULT}}
        !            50: 
        !            51: /* Define __HAVE_68881__ in preprocessor,
        !            52:    according to the -m flags.
        !            53:    This will control the use of inline 68881 insns in certain macros.
        !            54:    Also inform the program which CPU this is for.  */
        !            55: 
        !            56: #if TARGET_DEFAULT & 02
        !            57: 
        !            58: /* -m68881 is the default */
        !            59: #define CPP_SPEC \
        !            60: "%{!msoft-float:%{mfpa:-D__HAVE_FPA__ }%{!mfpa:-D__HAVE_68881__ }}\
        !            61: %{!ansi:%{m68000:-Dmc68010 }%{mc68000:-Dmc68010 }%{!mc68000:%{!m68000:-Dmc68020 }}\
        !            62: %{!ansi:-D_APOLLO_SOURCE}}"
        !            63: 
        !            64: #else
        !            65: 
        !            66: /* -msoft-float is the default */
        !            67: #define CPP_SPEC \
        !            68: "%{m68881:-D__HAVE_68881__ }%{mfpa:-D__HAVE_FPA__ }\
        !            69: %{!ansi:%{m68000:-Dmc68010 }%{mc68000:-Dmc68010 }%{!mc68000:%{!m68000:-Dmc68020 }}\
        !            70: %{!ansi:-D_APOLLO_SOURCE}}"
        !            71: 
        !            72: #endif
        !            73: 
        !            74: /* Names to predefine in the preprocessor for this target machine.  */
        !            75: /* These are the ones defined by Apollo, plus mc68000 for uniformity with
        !            76:    GCC on other 68000 systems.  */
        !            77: 
        !            78: #define CPP_PREDEFINES "-Dapollo -Daegis -Dunix"
        !            79: 
        !            80: /* cpp has to support a #sccs directive for the /usr/include files */
        !            81: 
        !            82: #define SCCS_DIRECTIVE
        !            83: 
        !            84: /* Allow #ident but output nothing for it.  */
        !            85: 
        !            86: #define IDENT_DIRECTIVE
        !            87: #define ASM_OUTPUT_IDENT(FILE, NAME)
        !            88: 
        !            89: /* Allow dollarsigns in identifiers */
        !            90: 
        !            91: #define DOLLARS_IN_IDENTIFIERS 2
        !            92: 
        !            93: /* -m68000 requires special flags to the assembler.
        !            94:    The -C flag is passed to a modified GNU assembler to cause COFF
        !            95:    modules to be produced.  Remove it if you're not using this.
        !            96:    (See [email protected].)  */
        !            97: 
        !            98: #define ASM_SPEC \
        !            99:  "-C %{m68000:-mc68010}%{mc68000:-mc68010}%{!mc68000:%{!m68000:-mc68020}}"
        !           100: 
        !           101: /* STARTFILE_SPEC
        !           102:    Note that includes knowledge of the default specs for gcc, ie. no
        !           103:    args translates to the same effect as -m68881 */
        !           104: 
        !           105: #if TARGET_DEFAULT & 2
        !           106: /* -m68881 is the default */
        !           107: #define STARTFILE_SPEC                                 \
        !           108:   "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
        !           109: #else
        !           110: /* -msoft-float is the default */
        !           111: #define STARTFILE_SPEC                                 \
        !           112:   "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
        !           113: #endif
        !           114: 
        !           115: /* Specify library to handle `-a' basic block profiling.  */
        !           116: 
        !           117: #define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} \
        !           118: %{a:/usr/lib/bb_link.o} "
        !           119: 
        !           120: /* Debugging is not supported yet */
        !           121: 
        !           122: #undef DBX_DEBUGGING_INFO
        !           123: #undef SDB_DEBUGGING_INFO
        !           124: 
        !           125: /* Every structure or union's size must be a multiple of 2 bytes.  */
        !           126: 
        !           127: #define STRUCTURE_SIZE_BOUNDARY 16
        !           128: 
        !           129: /* Functions which return large structures get the address
        !           130:    to place the wanted value at offset 8 from the frame.  */
        !           131: 
        !           132: #undef  PCC_STATIC_STRUCT_RETURN
        !           133: #undef  STRUCT_VALUE_REGNUM
        !           134: 
        !           135: /* Caller treats address of return area like a parm.  */
        !           136: #define STRUCT_VALUE 0
        !           137: 
        !           138: #define STRUCT_VALUE_INCOMING \
        !           139:   gen_rtx (MEM, Pmode,                                 \
        !           140:           gen_rtx (PLUS, SImode, frame_pointer_rtx,    \
        !           141:                    gen_rtx (CONST_INT, VOIDmode, 8)))
        !           142: 
        !           143: /* Boundary (in *bits*) on which stack pointer should be aligned.  */
        !           144: #undef STACK_BOUNDARY
        !           145: #define STACK_BOUNDARY 32
        !           146: 
        !           147: /* Specify how to pad function arguments.
        !           148:    Arguments are not padded at all; the stack is kept aligned on long
        !           149:    boundaries. */
        !           150: 
        !           151: #define FUNCTION_ARG_PADDING(mode, size) none
        !           152: 
        !           153: /* Short integral argument prototype promotion is not done */
        !           154: 
        !           155: #undef  PROMOTE_PROTOTYPES
        !           156: 
        !           157: /* The definition of this macro imposes a limit on the size of
        !           158:    an aggregate object which can be treated as if it were a scalar
        !           159:    object. */
        !           160: 
        !           161: #define MAX_FIXED_MODE_SIZE    BITS_PER_WORD
        !           162: 
        !           163: /* The definition of this macro implies that there are cases where
        !           164:    a scalar value cannot be returned in registers.
        !           165:    For Apollo, anything larger than one integer register is returned
        !           166:    using the structure-value mechanism, i.e. objects of DFmode are
        !           167:    returned that way. */
        !           168: 
        !           169: #define RETURN_IN_MEMORY(type) \
        !           170:   (GET_MODE_SIZE (TYPE_MODE (type)) > UNITS_PER_WORD)
        !           171: 
        !           172: /* This is how to output a reference to a user-level label named NAME.
        !           173:    In order to link to Apollo libraries, no underscore is prepended to names.
        !           174:    `assemble_name' uses this.  */
        !           175: 
        !           176: #undef  ASM_OUTPUT_LABELREF
        !           177: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
        !           178:   fprintf (FILE, "%s", NAME)
        !           179: 
        !           180: 

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