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Annotation of GNUtools/cc/config/i386/sysv3.h, revision 1.1

1.1     ! root        1: /* Definitions for Intel 386 running system V.
        !             2:    Copyright (C) 1988 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: 
        !            21: #include "i386/i386.h"
        !            22: 
        !            23: /* Use default settings for system V.3.  */
        !            24: 
        !            25: #include "svr3.h"
        !            26: 
        !            27: /* Use the ATT assembler syntax.
        !            28:    This overrides at least one macro (ASM_OUTPUT_LABELREF) from svr3.h.  */
        !            29: 
        !            30: #include "i386/att.h"
        !            31: 
        !            32: /* Use crt1.o as a startup file and crtn.o as a closing file.  */
        !            33: 
        !            34: #define STARTFILE_SPEC  \
        !            35:   "%{pg:gcrt1.o%s}%{!pg:%{posix:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}%{!posix:%{p:mcrt1.o%s}%{!p:crt1.o%s}}} crtbegin.o%s\
        !            36:    %{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
        !            37: 
        !            38: /* ??? There is a suggestion that -lg is needed here.
        !            39:    Does anyone know whether this is right?  */
        !            40: #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
        !            41: 
        !            42: /* Specify predefined symbols in preprocessor.  */
        !            43: 
        !            44: #define CPP_PREDEFINES "-Dunix -Di386 -Asystem(unix) -Asystem(svr3) -Acpu(i386) -Amachine(i386)"
        !            45: 
        !            46: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
        !            47: 
        !            48: /* Writing `int' for a bitfield forces int alignment for the structure.  */
        !            49: 
        !            50: #define PCC_BITFIELD_TYPE_MATTERS 1
        !            51: 
        !            52: /* Don't write a `.optim' pseudo; this assembler doesn't handle them.  */
        !            53: 
        !            54: #undef ASM_FILE_START_1
        !            55: #define ASM_FILE_START_1(FILE)
        !            56: 
        !            57: /* longjmp may fail to restore the registers if called from the same
        !            58:    function that called setjmp.  To compensate, the compiler avoids
        !            59:    putting variables in registers in functions that use both setjmp
        !            60:    and longjmp.  */
        !            61: 
        !            62: #define NON_SAVING_SETJMP \
        !            63:   (current_function_calls_setjmp && current_function_calls_longjmp)
        !            64: 
        !            65: /* longjmp may fail to restore the stack pointer if the saved frame
        !            66:    pointer is the same as the caller's frame pointer.  Requiring a frame
        !            67:    pointer in any function that calls setjmp or longjmp avoids this
        !            68:    problem, unless setjmp and longjmp are called from the same function.
        !            69:    Since a frame pointer will be required in such a function, it is OK
        !            70:    that the stack pointer is not restored.  */
        !            71: 
        !            72: #undef FRAME_POINTER_REQUIRED
        !            73: #define FRAME_POINTER_REQUIRED \
        !            74:   (current_function_calls_setjmp || current_function_calls_longjmp)
        !            75: 
        !            76: /* Modify ASM_OUTPUT_LOCAL slightly to test -msvr3-shlib.  */
        !            77: #undef ASM_OUTPUT_LOCAL
        !            78: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)    \
        !            79:   do {                                                 \
        !            80:     int align = exact_log2 (ROUNDED);                  \
        !            81:     if (align > 2) align = 2;                          \
        !            82:     if (TARGET_SVR3_SHLIB)                             \
        !            83:       data_section ();                                 \
        !            84:     else                                               \
        !            85:       bss_section ();                                  \
        !            86:     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align);        \
        !            87:     ASM_OUTPUT_LABEL ((FILE), (NAME));                 \
        !            88:     fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED));    \
        !            89:   } while (0)
        !            90: 
        !            91: /* Define a few machine-specific details of the implementation of
        !            92:    constructors.
        !            93: 
        !            94:    The __CTORS_LIST__ goes in the .init section.  Define CTOR_LIST_BEGIN
        !            95:    and CTOR_LIST_END to contribute to the .init section an instruction to
        !            96:    push a word containing 0 (or some equivalent of that).
        !            97: 
        !            98:    ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the
        !            99:    constructor.  */
        !           100: 
        !           101: #undef INIT_SECTION_ASM_OP
        !           102: #define INIT_SECTION_ASM_OP     ".section .init,\"x\""
        !           103: 
        !           104: #define CTOR_LIST_BEGIN                                \
        !           105:   asm (INIT_SECTION_ASM_OP);                   \
        !           106:   asm ("pushl $0")
        !           107: #define CTOR_LIST_END CTOR_LIST_BEGIN
        !           108: 
        !           109: #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)      \
        !           110:   do {                                         \
        !           111:     init_section ();                           \
        !           112:     fprintf (FILE, "\tpushl $");               \
        !           113:     assemble_name (FILE, NAME);                        \
        !           114:     fprintf (FILE, "\n");                      \
        !           115:   } while (0)

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