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Annotation of gcc/config/i860v4.h, revision 1.1

1.1     ! root        1: /* Target definitions for GNU compiler for Intel 80860 running System V.4
        !             2:    Copyright (C) 1991 Free Software Foundation, Inc.
        !             3: 
        !             4:    Written by Ron Guilmette ([email protected]).
        !             5: 
        !             6: This file is part of GNU CC.
        !             7: 
        !             8: GNU CC is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU General Public License as published by
        !            10: the Free Software Foundation; either version 2, or (at your option)
        !            11: any later version.
        !            12: 
        !            13: GNU CC is distributed in the hope that it will be useful,
        !            14: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            16: GNU General Public License for more details.
        !            17: 
        !            18: You should have received a copy of the GNU General Public License
        !            19: along with GNU CC; see the file COPYING.  If not, write to
        !            20: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            21: 
        !            22: #include "i860.h"
        !            23: #include "svr4.h"
        !            24: 
        !            25: #undef TARGET_VERSION
        !            26: #define TARGET_VERSION fprintf (stderr, " (i860 System V Release 4)");
        !            27: 
        !            28: /* Provide a set of pre-definitions and pre-assertions appropriate for
        !            29:    the i860 running svr4.  Note that the symbol `__SVR4__' MUST BE
        !            30:    DEFINED!  It is needed so that the va_list struct in va-i860.h
        !            31:    will get correctly defined for the svr4 (ABI compliant) case rather
        !            32:    than for the previous (svr3, svr2, ...) case.  It also needs to be
        !            33:    defined so that the correct (svr4) version of __builtin_saveregs
        !            34:    will be selected when we are building gnulib2.c.
        !            35:    __svr4__ is our extension.  */
        !            36: 
        !            37: #define CPP_PREDEFINES \
        !            38:   "-Di860 -Dunix -DSVR4 -D__svr4__ -Asystem(unix) -Acpu(i860) -Amachine(i860)"
        !            39: 
        !            40: /* The prefix to be used in assembler output for all names of registers.
        !            41:    This string gets prepended to all i860 register names (svr4 only).  */
        !            42: 
        !            43: #define I860_REG_PREFIX        "%"
        !            44: 
        !            45: #define ASM_COMMENT_START "#"
        !            46: 
        !            47: #undef TYPE_OPERAND_FMT
        !            48: #define TYPE_OPERAND_FMT      "\"%s\""
        !            49: 
        !            50: #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
        !            51: 
        !            52: /* The following macro definition overrides the one in i860.h
        !            53:    because the svr4 i860 assembler requires a different syntax
        !            54:    for getting parts of constant/relocatable values.  */
        !            55: 
        !            56: #undef PRINT_OPERAND_PART
        !            57: #define PRINT_OPERAND_PART(FILE, X, PART_CODE)                         \
        !            58:   do { fprintf (FILE, "[");                                            \
        !            59:        output_address (X);                                             \
        !            60:        fprintf (FILE, "]@%s", PART_CODE);                              \
        !            61:   } while (0)
        !            62: 
        !            63: #undef ASM_FILE_START
        !            64: #define ASM_FILE_START(FILE)                                           \
        !            65:   do { output_file_directive (FILE, main_input_filename);              \
        !            66:        fprintf (FILE, "\t.version\t\"01.01\"\n");                      \
        !            67:   } while (0)
        !            68: 
        !            69: /* Output the special word the svr4 SDB wants to see just before
        !            70:    the first word of each function's prologue code.  */
        !            71: 
        !            72: extern char *current_function_original_name;
        !            73: 
        !            74: /* This special macro is used to output a magic word just before the
        !            75:    first word of each function.  On some versions of UNIX running on
        !            76:    the i860, this word can be any word that looks like a NOP, however
        !            77:    under svr4, this neds to be an `shr r0,r0,r0' instruction in which
        !            78:    the normally unused low-order bits contain the length of the function
        !            79:    prologue code (in bytes).  This is needed to make the svr4 SDB debugger
        !            80:    happy.  */
        !            81: 
        !            82: #undef ASM_OUTPUT_FUNCTION_PREFIX
        !            83: #define ASM_OUTPUT_FUNCTION_PREFIX(FILE, FNNAME)                       \
        !            84:   do { ASM_OUTPUT_ALIGN (FILE, 2);                                     \
        !            85:        fprintf ((FILE), "\t.long\t.ep.");                              \
        !            86:        assemble_name (FILE, FNNAME);                                   \
        !            87:        fprintf (FILE, "-");                                            \
        !            88:        assemble_name (FILE, FNNAME);                                   \
        !            89:        fprintf (FILE, "+0xc8000000\n");                                \
        !            90:        current_function_original_name = (FNNAME);                      \
        !            91:   } while (0)
        !            92: 
        !            93: /* Output the special label that must go just after each function's
        !            94:    prologue code to support svr4 SDB.  */
        !            95: 
        !            96: #define ASM_OUTPUT_PROLOGUE_SUFFIX(FILE)                               \
        !            97:   do { fprintf (FILE, ".ep.");                                         \
        !            98:        assemble_name (FILE, current_function_original_name);           \
        !            99:        fprintf (FILE, ":\n");                                          \
        !           100:   } while (0)
        !           101: 
        !           102: #undef CTORS_SECTION_ASM_OP
        !           103: #define CTORS_SECTION_ASM_OP   "\t.section\t.ctors,\"a\",\"progbits\"\n"
        !           104: #undef DTORS_SECTION_ASM_OP
        !           105: #define DTORS_SECTION_ASM_OP   "\t.section\t.dtors,\"a\",\"progbits\"\n"
        !           106: 
        !           107: /* Add definitions to support the .tdesc section as specified in the svr4
        !           108:    ABI for the i860.  */
        !           109: 
        !           110: #define TDESC_SECTION_ASM_OP    "\t.section\t.tdesc"
        !           111: 
        !           112: #undef EXTRA_SECTIONS
        !           113: #define EXTRA_SECTIONS in_const, in_ctors, in_dtors, in_tdesc
        !           114: 
        !           115: #undef EXTRA_SECTION_FUNCTIONS
        !           116: #define EXTRA_SECTION_FUNCTIONS                                                \
        !           117:   CONST_SECTION_FUNCTION                                               \
        !           118:   CTORS_SECTION_FUNCTION                                               \
        !           119:   DTORS_SECTION_FUNCTION                                               \
        !           120:   TDESC_SECTION_FUNCTION
        !           121: 
        !           122: #define TDESC_SECTION_FUNCTION                                         \
        !           123: void                                                                   \
        !           124: tdesc_section ()                                                       \
        !           125: {                                                                      \
        !           126:   if (in_section != in_tdesc)                                          \
        !           127:     {                                                                  \
        !           128:       fprintf (asm_out_file, "%s\n", TDESC_SECTION_ASM_OP);            \
        !           129:       in_section = in_tdesc;                                           \
        !           130:     }                                                                  \
        !           131: }

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