gcc/config/m68k/apollo68.h

   1 /* Definitions of target machine for GNU compiler.  Apollo 680X0 version.
   2    Copyright (C) 1989,1992 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/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
  95 #define ASM_SPEC \
  96  "%{m68000:-mc68010}%{mc68000:-mc68010}%{!mc68000:%{!m68000:-mc68020}}"
  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
 122 /* We have atexit(2).  So C++ can use it for global destructors.  */
 123
 124 #if 0 /* troy@cbme.unsw.edu.au says people are still using sr10.2
 125          and it does not support atexit.  */
 126 #define HAVE_ATEXIT
 127 #endif
 128
 129 /* Every structure or union's size must be a multiple of 2 bytes.  */
 130
 131 #define STRUCTURE_SIZE_BOUNDARY 16
 132
 133 /* Boundary (in *bits*) on which stack pointer should be aligned.  */
 134 #undef STACK_BOUNDARY
 135 #define STACK_BOUNDARY 32
 136
 137 /* Functions which return large structures get the address
 138    to place the wanted value from a hidden parameter.  */
 139
 140 #undef  PCC_STATIC_STRUCT_RETURN
 141 #undef  STRUCT_VALUE_REGNUM
 142 #define STRUCT_VALUE 0
 143 #define STRUCT_VALUE_INCOMING 0
 144
 145 /* Specify how to pad function arguments.
 146    Arguments are not padded at all; the stack is kept aligned on long
 147    boundaries. */
 148
 149 #define FUNCTION_ARG_PADDING(mode, size) none
 150
 151 /* The definition of this macro imposes a limit on the size of
 152    an aggregate object which can be treated as if it were a scalar
 153    object.  */
 154
 155 #define MAX_FIXED_MODE_SIZE    BITS_PER_WORD
 156
 157 /* The definition of this macro implies that there are cases where
 158    a scalar value cannot be returned in registers.
 159    For Apollo, anything larger than one integer register is returned
 160    using the structure-value mechanism, i.e. objects of DFmode are
 161    returned that way. */
 162
 163 #define RETURN_IN_MEMORY(type) \
 164   (TYPE_MODE (type) == BLKmode \
 165    || GET_MODE_SIZE (TYPE_MODE (type)) > UNITS_PER_WORD)
 166
 167 /* In order to link with Apollo libraries, we can't prefix external
 168    symbols with an underscore.  */
 169
 170 #undef  USER_LABEL_PREFIX
 171
 172 /* Use a prefix for local labels, just to be on the save side.  */
 173
 174 #undef LOCAL_LABEL_PREFIX
 175 #define LOCAL_LABEL_PREFIX "."
 176
 177 /* Use a register prefix to avoid clashes with external symbols (classic
 178    example: `extern char PC;' in termcap).  */
 179
 180 #undef REGISTER_PREFIX
 181 #define REGISTER_PREFIX "%"
 182
 183 /* In the machine description we can't use %R, because it will not be seen
 184    by ASM_FPRINTF.  (Isn't that a design bug?).  */
 185
 186 #undef REGISTER_PREFIX_MD
 187 #define REGISTER_PREFIX_MD "%%"
 188
 189 /* config/m68k.md has an explicit reference to the program counter,
 190    prefix this by the register prefix.  */
 191
 192 #define ASM_RETURN_CASE_JUMP    return "jmp %%pc@(2,%0:w)"
 193
 194
 195 /* Here are the new register names.  */
 196
 197 #undef REGISTER_NAMES
 198 #ifndef SUPPORT_SUN_FPA
 199 #define REGISTER_NAMES \
 200 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",        \
 201  "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",        \
 202  "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
 203 #else /* SUPPORTED_SUN_FPA */
 204 #define REGISTER_NAMES \
 205 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",        \
 206  "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",        \
 207  "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7", \
 208  "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6", "%fpa7", \
 209  "%fpa8", "%fpa9", "%fpa10", "%fpa11", "%fpa12", "%fpa13", "%fpa14", "%fpa15", \
 210  "%fpa16", "%fpa17", "%fpa18", "%fpa19", "%fpa20", "%fpa21", "%fpa22", "%fpa23", \
 211  "%fpa24", "%fpa25", "%fpa26", "%fpa27", "%fpa28", "%fpa29", "%fpa30", "%fpa31" }
 212 #endif /* defined SUPPORT_SUN_FPA */