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Annotation of GNUtools/cc/config/sparc/sysv4.h, revision 1.1

1.1     ! root        1: /* Target definitions for GNU compiler for Sparc running System V.4
        !             2:    Copyright (C) 1991, 1992 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 "sparc/sparc.h"
        !            23: 
        !            24: /* Undefine some symbols which are defined in "sparc.h" but which are
        !            25:    appropriate only for SunOS 4.x, and not for svr4.  */
        !            26: 
        !            27: #undef DBX_DEBUGGING_INFO
        !            28: #undef WORD_SWITCH_TAKES_ARG
        !            29: #undef SELECT_SECTION
        !            30: #undef ASM_DECLARE_FUNCTION_NAME
        !            31: #undef TEXT_SECTION_ASM_OP
        !            32: #undef DATA_SECTION_ASM_OP
        !            33: 
        !            34: #include "svr4.h"
        !            35: 
        !            36: /* Undefined some symbols which are defined in "svr4.h" but which are
        !            37:    appropriate only for typical svr4 systems, but not for the specific
        !            38:    case of svr4 running on a Sparc.  */
        !            39: 
        !            40: #undef CTORS_SECTION_ASM_OP
        !            41: #undef DTORS_SECTION_ASM_OP
        !            42: #undef INIT_SECTION_ASM_OP
        !            43: #undef CONST_SECTION_ASM_OP
        !            44: #undef TYPE_OPERAND_FMT
        !            45: #undef PUSHSECTION_FORMAT
        !            46: #undef STRING_ASM_OP
        !            47: #undef COMMON_ASM_OP
        !            48: #undef SKIP_ASM_OP
        !            49: #undef SET_ASM_OP      /* Has no equivalent.  See ASM_OUTPUT_DEF below.  */
        !            50: 
        !            51: /* Provide a set of pre-definitions and pre-assertions appropriate for
        !            52:    the Sparc running svr4.  __svr4__ is our extension.  */
        !            53: 
        !            54: #define CPP_PREDEFINES \
        !            55:   "-Dsparc -Dunix -D__svr4__ \
        !            56:    -Asystem(unix) -Asystem(svr4) -Acpu(sparc) -Amachine(sparc) \
        !            57:    -D__GCC_NEW_VARARGS__"
        !            58: 
        !            59: /* The specialized code which needs to appear in the .init section prior
        !            60:    to the prologue code for `__do_global_ctors' (see crtstuff.c).
        !            61: 
        !            62:    On Sparcs running svr4, the /usr/ccs/lib/crti.o file (with gets linked
        !            63:    in prior to the crtbegin.o file) has a single `save' instruction in its
        !            64:    .init section.  That `save' instruction tries to setup a stack frame for
        !            65:    the sake of any subsequent code in the .init section.  Unfortunately,
        !            66:    the size it uses for the stack frame is only a guess, and is not really
        !            67:    adequate for our purposes.  More importantly, we independently put our
        !            68:    own standard function prologue (for __do_global_ctors) into the .init
        !            69:    section and that function prologue includes its own `save' instruction!
        !            70:    Thus, unless we do something to correct the situation, we'll get *two*
        !            71:    stack frames allocated when crt0.o calls the code in the .init section,
        !            72:    and havoc will ensue.  The following macro definition prevents such woes.
        !            73: */
        !            74: 
        !            75: #define INIT_SECTION_PREAMBLE  asm ("restore")
        !            76: 
        !            77: /* This is the string used to begin an assembly language comment for the
        !            78:    Sparc/svr4 assembler.  */
        !            79: 
        !            80: #define ASM_COMMENT_START "!"
        !            81: 
        !            82: /* Define the names of various pseudo-op used by the Sparc/svr4 assembler.
        !            83:    Note that many of these are different from the typical pseudo-ops used
        !            84:    by most svr4 assemblers.  That is probably due to a (misguided?) attempt
        !            85:    to keep the Sparc/svr4 assembler somewhat compatible with the Sparc/SunOS
        !            86:    assembler.  */
        !            87: 
        !            88: #define STRING_ASM_OP          ".asciz"
        !            89: #define COMMON_ASM_OP          ".common"
        !            90: #define SKIP_ASM_OP            ".skip"
        !            91: #define UNALIGNED_INT_ASM_OP   ".uaword"
        !            92: #define UNALIGNED_SHORT_ASM_OP ".uahalf"
        !            93: #define PUSHSECTION_ASM_OP     ".pushsection"
        !            94: #define POPSECTION_ASM_OP      ".popsection"
        !            95: 
        !            96: /* This is the format used to print the second operand of a .type pseudo-op
        !            97:    for the Sparc/svr4 assembler.  */
        !            98: 
        !            99: #define TYPE_OPERAND_FMT      "#%s"
        !           100: 
        !           101: /* This is the format used to print a .pushsection pseudo-op (and its operand)
        !           102:    for the Sparc/svr4 assembler.  */
        !           103: 
        !           104: #define PUSHSECTION_FORMAT     "\t%s\t\"%s\"\n"
        !           105: 
        !           106: #undef ASM_OUTPUT_CASE_LABEL
        !           107: #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)            \
        !           108: do { ASM_OUTPUT_ALIGN ((FILE), 2);                                     \
        !           109:      ASM_OUTPUT_INTERNAL_LABEL ((FILE), PREFIX, NUM);                  \
        !           110:    } while (0)
        !           111: 
        !           112: /* This is how to equate one symbol to another symbol.  The syntax used is
        !           113:    `SYM1=SYM2'.  Note that this is different from the way equates are done
        !           114:    with most svr4 assemblers, where the syntax is `.set SYM1,SYM2'.  */
        !           115: 
        !           116: #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                             \
        !           117:  do {  fprintf ((FILE), "\t");                                         \
        !           118:        assemble_name (FILE, LABEL1);                                   \
        !           119:        fprintf (FILE, " = ");                                          \
        !           120:        assemble_name (FILE, LABEL2);                                   \
        !           121:        fprintf (FILE, "\n");                                           \
        !           122:   } while (0)
        !           123: 
        !           124: /* Define how the Sparc registers should be numbered for Dwarf output.
        !           125:    The numbering provided here should be compatible with the native
        !           126:    svr4 SDB debugger in the Sparc/svr4 reference port.  The numbering
        !           127:    is as follows:
        !           128: 
        !           129:    Assembly name       gcc internal regno      Dwarf regno
        !           130:    ----------------------------------------------------------
        !           131:    g0-g7               0-7                     0-7
        !           132:    o0-o7               8-15                    8-15
        !           133:    l0-l7               16-23                   16-23
        !           134:    i0-i7               24-31                   24-31
        !           135:    f0-f31              32-63                   40-71
        !           136: */
        !           137: 
        !           138: #define DBX_REGISTER_NUMBER(REGNO)                                     \
        !           139:   (((REGNO) < 32) ? (REGNO)                                            \
        !           140:    : ((REGNO) < 63) ? ((REGNO) + 8)                                    \
        !           141:    : (abort (), 0))
        !           142: 
        !           143: /* A set of symbol definitions for assembly pseudo-ops which will
        !           144:    get us switched to various sections of interest.  These are used
        !           145:    in all places where we simply want to switch to a section, and
        !           146:    *not* to push the previous section name onto the assembler's
        !           147:    section names stack (as we do often in dwarfout.c).  */
        !           148: 
        !           149: #define TEXT_SECTION_ASM_OP    ".section\t\".text\""
        !           150: #define DATA_SECTION_ASM_OP    ".section\t\".data\""
        !           151: #define BSS_SECTION_ASM_OP     ".section\t\".bss\""
        !           152: #define CONST_SECTION_ASM_OP   ".section\t\".rodata\""
        !           153: #define INIT_SECTION_ASM_OP    ".section\t\".init\",#alloc"
        !           154: #define CTORS_SECTION_ASM_OP    ".section\t\".ctors\",#alloc"
        !           155: #define DTORS_SECTION_ASM_OP    ".section\t\".dtors\",#alloc"
        !           156: 
        !           157: /* If the host and target formats match, output the floats as hex.  */
        !           158: #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
        !           159: #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
        !           160: 
        !           161: /* This is how to output assembly code to define a `float' constant.
        !           162:    We always have to use a .long pseudo-op to do this because the native
        !           163:    SVR4 ELF assembler is buggy and it generates incorrect values when we
        !           164:    try to use the .float pseudo-op instead.  */
        !           165: 
        !           166: #undef ASM_OUTPUT_FLOAT
        !           167: #define ASM_OUTPUT_FLOAT(FILE,VALUE)                                   \
        !           168: do { long value;                                                       \
        !           169:      REAL_VALUE_TO_TARGET_SINGLE ((VALUE), value);                     \
        !           170:      fprintf((FILE), "\t.long\t0x%x\n", value);                                \
        !           171:    } while (0)
        !           172: 
        !           173: /* This is how to output assembly code to define a `double' constant.
        !           174:    We always have to use a pair of .long pseudo-ops to do this because
        !           175:    the native SVR4 ELF assembler is buggy and it generates incorrect
        !           176:    values when we try to use the the .double pseudo-op instead.  */
        !           177: 
        !           178: #undef ASM_OUTPUT_DOUBLE
        !           179: #define ASM_OUTPUT_DOUBLE(FILE,VALUE)                                  \
        !           180: do { long value[2];                                                    \
        !           181:      REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), value);                     \
        !           182:      fprintf((FILE), "\t.long\t0x%x\n", value[0]);                     \
        !           183:      fprintf((FILE), "\t.long\t0x%x\n", value[1]);                     \
        !           184:    } while (0)
        !           185: 
        !           186: #endif /* word order matches */
        !           187: #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
        !           188: 
        !           189: /* This is how to output an assembler line defining a `long double'
        !           190:    constant.  */
        !           191: 
        !           192: #undef ASM_OUTPUT_LONG_DOUBLE
        !           193: #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE)                             \
        !           194: do { long value[4];                                                    \
        !           195:      REAL_VALUE_TO_TARGET_LONG_DOUBLE ((VALUE), value);                        \
        !           196:      fprintf((FILE), "\t.long\t0x%x\n", value[0]);                     \
        !           197:      fprintf((FILE), "\t.long\t0x%x\n", value[1]);                     \
        !           198:      fprintf((FILE), "\t.long\t0x%x\n", value[2]);                     \
        !           199:      fprintf((FILE), "\t.long\t0x%x\n", value[3]);                     \
        !           200:    } while (0)

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