gcc/config/m68k/pbb.h

   1 /* Definitions of target machine for GNU compiler.
   2    Citicorp/TTI Unicom PBB version (using GAS with a %-register prefix)
   3    Copyright (C) 1987, 1988, 1990, 1996, 1997, 2002 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Note:   This config uses a version of gas with a postprocessing stage that
  23    converts the output of gas to coff containing stab debug symbols.
  24    (See vasta@apollo.com or mb@soldev.tti.com) */
  25
  26 #include "m68k/m68k.h"
  27
  28 /* See m68k.h.  5 means 68020 without 68881.  */
  29
  30 #define TARGET_DEFAULT (MASK_BITFIELD|MASK_68020)
  31
  32 /* Don't try using XFmode.  */
  33 #undef LONG_DOUBLE_TYPE_SIZE
  34 #define LONG_DOUBLE_TYPE_SIZE 64
  35
  36 /* Every structure or union's size must be a multiple of 2 bytes.  */
  37 #define STRUCTURE_SIZE_BOUNDARY 16
  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 /* Names to predefine in the preprocessor for this target machine.  */
  45
  46 #define CPP_PREDEFINES "-Dm68k -Dunix -DUnicomPBB -Dmc68k -Dmc68020 -Dmc68k32 -Asystem=unix  -Acpu=m68k -Amachine=m68k"
  47
  48 /* We want DBX format for use with gdb under COFF.  */
  49
  50 #define DBX_DEBUGGING_INFO 1
  51
  52 /* Generate calls to memcpy, memcmp and memset.  */
  53
  54 #define TARGET_MEM_FUNCTIONS
  55
  56 /* -m68000 requires special flags to the assembler.  */
  57
  58 #define ASM_SPEC \
  59  " %{m68000:-mc68010}%{mc68000:-mc68010}"
  60
  61 /* we use /lib/libp/lib*  when profiling */
  62
  63 #define LIB_SPEC "%{p:-L/usr/lib/libp} %{pg:-L/usr/lib/libp} -lc"
  64
  65
  66 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
  67 /*
  68  * The loader directive file gcc.ifile defines how to merge the constructor
  69  * sections into the data section.  Also, since gas only puts out those
  70  * sections in response to N_SETT stabs, and does not (yet) have a
  71  * ".sections" directive, gcc.ifile also defines the list symbols
  72  * __DTOR_LIST__ and __CTOR_LIST__.
  73  *
  74  * Finally, we must explicitly specify the file from libgcc.a that defines
  75  * exit(), otherwise if the user specifies (for example) "-lc_s" on the
  76  * command line, the wrong exit() will be used and global destructors will
  77  * not get called .
  78  */
  79
  80 #define STARTFILE_SPEC \
  81 "%{!r: gcc.ifile%s} %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} \
  82 %{!r:_exit.o%s}"
  83
  84 #define ENDFILE_SPEC "crtn.o%s"
  85
  86 /* GAS register prefix assembly syntax: */
  87
  88 /* User labels have no prefix */
  89 #undef  USER_LABEL_PREFIX
  90 #define USER_LABEL_PREFIX ""
  91
  92 /* local labels are prefixed with ".L" */
  93 #undef  LOCAL_LABEL_PREFIX
  94 #define LOCAL_LABEL_PREFIX "."
  95
  96 /* registers are prefixed with "%" */
  97 #undef  REGISTER_PREFIX
  98 #define REGISTER_PREFIX "%"
  99
 100 #undef REGISTER_NAMES
 101 #define REGISTER_NAMES \
 102 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",        \
 103  "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",        \
 104  "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7"}
 105
 106 #undef FUNCTION_EXTRA_EPILOGUE
 107 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)                             \
 108 { if (current_function_returns_pointer                                  \
 109       && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))     \
 110       asm_fprintf (FILE, "\tmovl %Rd0,%Ra0\n"); }
 111
 112 #define ASM_RETURN_CASE_JUMP                            \
 113   do {                                                  \
 114     if (TARGET_5200)                                    \
 115       {                                                 \
 116         if (ADDRESS_REG_P (operands[0]))                \
 117           return "jmp %%pc@(2,%0:l)";                   \
 118         else                                            \
 119           return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";      \
 120       }                                                 \
 121     else                                                \
 122       return "jmp %%pc@(2,%0:w)";                       \
 123   } while (0)
 124
 125 /* Although the gas we use can create .ctor and .dtor sections from N_SETT
 126    stabs, it does not support section directives, so we need to have the loader
 127    define the lists.
 128  */
 129 #define CTOR_LISTS_DEFINED_EXTERNALLY
 130
 131 /* similar to default, but allows for the table defined by ld with gcc.ifile.
 132    nptrs is always 0.  So we need to instead check that __DTOR_LIST__[1] != 0.
 133    The old check is left in so that the same macro can be used if and when
 134    a future version of gas does support section directives.  */
 135
 136 #define DO_GLOBAL_DTORS_BODY {int nptrs = *(int *)__DTOR_LIST__; int i; \
 137   if (nptrs == -1 || (__DTOR_LIST__[0] == 0 && __DTOR_LIST__[1] != 0))  \
 138     for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++);            \
 139   for (i = nptrs; i >= 1; i--)                                          \
 140     __DTOR_LIST__[i] (); }
 141
 142 /*
 143  * Here is an example gcc.ifile.  I've tested it on PBB 68k and on sco 386
 144  * systems. The NEXT(0x200000) works on just about all 386 and m68k systems,
 145  * but can be reduced to any power of 2 that is >= NBPS (0x10000 on a pbb).
 146
 147    SECTIONS {
 148        .text BIND(0x200200) BLOCK (0x200) :
 149                 { *(.init) *(.text) vfork = fork; *(.fini) }
 150
 151         GROUP BIND( NEXT(0x200000) + ADDR(.text) + SIZEOF(.text)):
 152         {      .data : { __CTOR_LIST__ = . ; . += 4; *(.ctor) . += 4 ;
 153                          __DTOR_LIST__ = . ; . += 4; *(.dtor) . += 4 ; }
 154                .bss : { }
 155        }
 156   }
 157  */
 158
 159 /*
 160 Local variables:
 161 version-control: t
 162 End:
 163 */