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Annotation of gcc/config/apollo68.h, revision 1.1.1.2

1.1       root        1: /* Definitions of target machine for GNU compiler.  Apollo 680X0 version.
1.1.1.2 ! root        2:    Copyright (C) 1989,1992 Free Software Foundation, Inc.
1.1       root        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: 
1.1.1.2 ! root       93: /* -m68000 requires special flags to the assembler.  */
1.1       root       94: 
                     95: #define ASM_SPEC \
1.1.1.2 ! root       96:  "%{m68000:-mc68010}%{mc68000:-mc68010}%{!mc68000:%{!m68000:-mc68020}}"
1.1       root       97: 
                     98: /* STARTFILE_SPEC
                     99:    Note that includes knowledge of the default specs for gcc, ie. no
                    100:    args translates to the same effect as -m68881 */
                    101: 
                    102: #if TARGET_DEFAULT & 2
                    103: /* -m68881 is the default */
                    104: #define STARTFILE_SPEC                                 \
                    105:   "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
                    106: #else
                    107: /* -msoft-float is the default */
                    108: #define STARTFILE_SPEC                                 \
                    109:   "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
                    110: #endif
                    111: 
                    112: /* Specify library to handle `-a' basic block profiling.  */
                    113: 
                    114: #define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} \
                    115: %{a:/usr/lib/bb_link.o} "
                    116: 
                    117: /* Debugging is not supported yet */
                    118: 
                    119: #undef DBX_DEBUGGING_INFO
                    120: #undef SDB_DEBUGGING_INFO
                    121: 
1.1.1.2 ! root      122: /* We have atexit(2).  So C++ can use it for global destructors.  */
        !           123: 
        !           124: #define HAVE_ATEXIT
        !           125: 
1.1       root      126: /* Every structure or union's size must be a multiple of 2 bytes.  */
                    127: 
                    128: #define STRUCTURE_SIZE_BOUNDARY 16
                    129: 
1.1.1.2 ! root      130: /* Boundary (in *bits*) on which stack pointer should be aligned.  */
        !           131: #undef STACK_BOUNDARY
        !           132: #define STACK_BOUNDARY 32
        !           133: 
1.1       root      134: /* Functions which return large structures get the address
1.1.1.2 ! root      135:    to place the wanted value from a hidden parameter.  */
1.1       root      136: 
                    137: #undef  PCC_STATIC_STRUCT_RETURN
                    138: #undef  STRUCT_VALUE_REGNUM
                    139: #define STRUCT_VALUE 0
1.1.1.2 ! root      140: #define STRUCT_VALUE_INCOMING 0
1.1       root      141: 
                    142: /* Specify how to pad function arguments.
                    143:    Arguments are not padded at all; the stack is kept aligned on long
                    144:    boundaries. */
                    145: 
                    146: #define FUNCTION_ARG_PADDING(mode, size) none
                    147: 
                    148: /* The definition of this macro imposes a limit on the size of
                    149:    an aggregate object which can be treated as if it were a scalar
1.1.1.2 ! root      150:    object.  */
1.1       root      151: 
                    152: #define MAX_FIXED_MODE_SIZE    BITS_PER_WORD
                    153: 
                    154: /* The definition of this macro implies that there are cases where
                    155:    a scalar value cannot be returned in registers.
                    156:    For Apollo, anything larger than one integer register is returned
                    157:    using the structure-value mechanism, i.e. objects of DFmode are
                    158:    returned that way. */
                    159: 
                    160: #define RETURN_IN_MEMORY(type) \
                    161:   (GET_MODE_SIZE (TYPE_MODE (type)) > UNITS_PER_WORD)
                    162: 
1.1.1.2 ! root      163: /* In order to link with Apollo libraries, we can't prefix external
        !           164:    symbols with an underscore.  */
        !           165: 
        !           166: #undef  USER_LABEL_PREFIX
        !           167: 
        !           168: /* Use a prefix for local labels, just to be on the save side.  */
        !           169: 
        !           170: #undef LOCAL_LABEL_PREFIX
        !           171: #define LOCAL_LABEL_PREFIX "."
        !           172: 
        !           173: /* Use a register prefix to avoid clashes with external symbols (classic
        !           174:    example: `extern char PC;' in termcap).  */
        !           175: 
        !           176: #undef REGISTER_PREFIX
        !           177: #define REGISTER_PREFIX "%"
        !           178: 
        !           179: /* In the machine description we can't use %R, because it will not be seen
        !           180:    by ASM_FPRINTF.  (Isn't that a design bug?).  */
        !           181: 
        !           182: #undef REGISTER_PREFIX_MD
        !           183: #define REGISTER_PREFIX_MD "%%"
        !           184: 
        !           185: /* config/m68k.md has an explicit reference to the program counter,
        !           186:    prefix this by the register prefix.  */
        !           187: 
        !           188: #define ASM_RETURN_CASE_JUMP    return "jmp %%pc@(2,%0:w)"
        !           189: 
1.1       root      190: 
1.1.1.2 ! root      191: /* Here are the new register names.  */
1.1       root      192: 
1.1.1.2 ! root      193: #undef REGISTER_NAMES
        !           194: #ifndef SUPPORT_SUN_FPA
        !           195: #define REGISTER_NAMES \
        !           196: {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",       \
        !           197:  "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",       \
        !           198:  "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
        !           199: #else /* SUPPORTED_SUN_FPA */
        !           200: #define REGISTER_NAMES \
        !           201: {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",       \
        !           202:  "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",       \
        !           203:  "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7", \
        !           204:  "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6", "%fpa7", \
        !           205:  "%fpa8", "%fpa9", "%fpa10", "%fpa11", "%fpa12", "%fpa13", "%fpa14", "%fpa15", \
        !           206:  "%fpa16", "%fpa17", "%fpa18", "%fpa19", "%fpa20", "%fpa21", "%fpa22", "%fpa23", \
        !           207:  "%fpa24", "%fpa25", "%fpa26", "%fpa27", "%fpa28", "%fpa29", "%fpa30", "%fpa31" }
        !           208: #endif /* defined SUPPORT_SUN_FPA */

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