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

1.1     ! root        1: /* Definitions of target machine for GNU compiler.
        !             2: 
        !             3:    Citicorp/TTI Unicom PBB version (using GAS with a %-register prefix)
        !             4: 
        !             5:    Copyright (C) 1987, 1988, 1990 Free Software Foundation, Inc.
        !             6: 
        !             7: This file is part of GNU CC.
        !             8: 
        !             9: GNU CC is free software; you can redistribute it and/or modify
        !            10: it under the terms of the GNU General Public License as published by
        !            11: the Free Software Foundation; either version 2, or (at your option)
        !            12: any later version.
        !            13: 
        !            14: GNU CC is distributed in the hope that it will be useful,
        !            15: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            16: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            17: GNU General Public License for more details.
        !            18: 
        !            19: You should have received a copy of the GNU General Public License
        !            20: along with GNU CC; see the file COPYING.  If not, write to
        !            21: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            22: 
        !            23: /* Note:   This config uses a version of gas with a postprocessing stage that
        !            24:    converts the output of gas to coff containing stab debug symbols.
        !            25:    (See [email protected] or [email protected]) */
        !            26: 
        !            27: #include "m68k.h"
        !            28: 
        !            29: /* See m68k.h.  5 means 68020 without 68881.  */
        !            30: 
        !            31: #define TARGET_DEFAULT 5
        !            32: 
        !            33: /* Every structure or union's size must be a multiple of 2 bytes.  */
        !            34: #define STRUCTURE_SIZE_BOUNDARY 16
        !            35: 
        !            36: /* Define __HAVE_68881__ in preprocessor if -m68881 is specified.
        !            37:    This will control the use of inline 68881 insns in certain macros.  */
        !            38: 
        !            39: #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
        !            40: 
        !            41: /* Names to predefine in the preprocessor for this target machine.  */
        !            42: 
        !            43: #define CPP_PREDEFINES "-Dm68k -Dunix -DUnicomPBB -Dmc68k -Dmc68020 -Dmc68k32"
        !            44: 
        !            45: /* We want DBX format for use with gdb under COFF.  */
        !            46: 
        !            47: #define DBX_DEBUGGING_INFO
        !            48: 
        !            49: /* Generate calls to memcpy, memcmp and memset.  */
        !            50: 
        !            51: #define TARGET_MEM_FUNCTIONS
        !            52: 
        !            53: /* -m68000 requires special flags to the assembler. */
        !            54: 
        !            55: #define ASM_SPEC \
        !            56:  " %{m68000:-mc68010}%{mc68000:-mc68010}"
        !            57: 
        !            58: /* we use /lib/libp/lib*  when profiling */
        !            59: 
        !            60: #define LIB_SPEC "%{p:-L/usr/lib/libp} %{pg:-L/usr/lib/libp} -lc"
        !            61: 
        !            62: 
        !            63: /* Use crt1.o as a startup file and crtn.o as a closing file.  */
        !            64: /*
        !            65:  * The loader directive file gcc.ifile defines how to merge the constructor 
        !            66:  * sections into the data section.  Also, since gas only puts out those 
        !            67:  * sections in response to N_SETT stabs, and does not (yet) have a 
        !            68:  * ".sections" directive, gcc.ifile also defines the list symbols 
        !            69:  * __DTOR_LIST__ and __CTOR_LIST__.
        !            70:  * 
        !            71:  * Finally, we must explicitly specify the file from libgcc.a that defines
        !            72:  * exit(), otherwise if the user specifies (for example) "-lc_s" on the 
        !            73:  * command line, the wrong exit() will be used and global destructors will 
        !            74:  * not get called .
        !            75:  */
        !            76: 
        !            77: #define STARTFILE_SPEC \
        !            78: "%{!r: gcc.ifile%s} %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} \
        !            79: %{!r:_exit.o%s}"
        !            80: 
        !            81: #define ENDFILE_SPEC "crtn.o%s"
        !            82: 
        !            83: /* cpp has to support a #sccs directive for the /usr/include files */
        !            84: 
        !            85: #define SCCS_DIRECTIVE
        !            86: 
        !            87: /* GAS register prefix assembly syntax: */
        !            88: 
        !            89: /* User labels have no prefix */
        !            90: #undef  USER_LABEL_PREFIX 
        !            91: #define USER_LABEL_PREFIX ""
        !            92: 
        !            93: /* local labels are prefixed with ".L" */
        !            94: #undef  LOCAL_LABEL_PREFIX
        !            95: #define LOCAL_LABEL_PREFIX "."
        !            96: 
        !            97: /* registers are prefixed with "%" */
        !            98: #undef  REGISTER_PREFIX
        !            99: #define REGISTER_PREFIX "%"
        !           100: 
        !           101: #undef REGISTER_NAMES
        !           102: #define REGISTER_NAMES \
        !           103: {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",       \
        !           104:  "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",       \
        !           105:  "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7"}
        !           106: 
        !           107: #undef FUNCTION_EXTRA_EPILOGUE
        !           108: #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE)                            \
        !           109:   { extern int current_function_returns_pointer;                       \
        !           110:     if ((current_function_returns_pointer) &&                          \
        !           111:       ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))        \
        !           112:       asm_fprintf (FILE, "\tmovl %Rd0,%Ra0\n"); } 
        !           113: 
        !           114: #define ASM_RETURN_CASE_JUMP   return "jmp %%pc@(2,%0:w)"
        !           115: 
        !           116: /* Although the gas we use can create .ctor and .dtor sections from N_SETT
        !           117:    stabs, it does not support section directives, so we need to have the loader
        !           118:    define the lists.
        !           119:  */
        !           120: #define CTOR_LISTS_DEFINED_EXTERNALLY
        !           121: 
        !           122: /* similar to default, but allows for the table defined by ld with gcc.ifile. 
        !           123:    nptrs is always 0.  So we need to instead check that __DTOR_LIST__[1] != 0.
        !           124:    The old check is left in so that the same macro can be used if and when  
        !           125:    a future version of gas does support section directives. */
        !           126: 
        !           127: #define DO_GLOBAL_DTORS_BODY {int nptrs = *(int *)__DTOR_LIST__; int i; \
        !           128:   if (nptrs == -1 || (__DTOR_LIST__[0] == 0 && __DTOR_LIST__[1] != 0))  \
        !           129:     for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++);           \
        !           130:   for (i = nptrs; i >= 1; i--)                                         \
        !           131:     __DTOR_LIST__[i] (); }
        !           132: 
        !           133: /* 
        !           134:  * Here is an example gcc.ifile.  I've tested it on PBB 68k and on sco 386
        !           135:  * systems. The NEXT(0x200000) works on just about all 386 and m68k systems, 
        !           136:  * but can be reduced to any power of 2 that is >= NBPS (0x10000 on a pbb).
        !           137: 
        !           138:    SECTIONS {
        !           139:        .text BIND(0x200200) BLOCK (0x200) : 
        !           140:                { *(.init) *(.text) vfork = fork; *(.fini) }
        !           141: 
        !           142:        GROUP BIND( NEXT(0x200000) + ADDR(.text) + SIZEOF(.text)):
        !           143:        {      .data : { __CTOR_LIST__ = . ; . += 4; *(.ctor) . += 4 ;
        !           144:                         __DTOR_LIST__ = . ; . += 4; *(.dtor) . += 4 ; }
        !           145:               .bss : { }
        !           146:        }
        !           147:   }
        !           148:  */
        !           149: 
        !           150: /*
        !           151: Local variables:
        !           152: version-control: t
        !           153: End:
        !           154: */

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