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Annotation of gcc/config/i386v.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.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 "att386.h"
        !            31: 
        !            32: /* By default, target has a 80387.  */
        !            33: 
        !            34: #define TARGET_DEFAULT 1
        !            35: 
        !            36: /* Use crt1.o as a startup file and crtn.o as a closing file.  */
        !            37: 
        !            38: #define STARTFILE_SPEC  \
        !            39:   "%{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\
        !            40:    %{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
        !            41: 
        !            42: #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
        !            43: 
        !            44: /* Specify predefined symbols in preprocessor.  */
        !            45: 
        !            46: #define CPP_PREDEFINES "-Dunix -Di386"
        !            47: 
        !            48: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
        !            49: 
        !            50: /* Writing `int' for a bitfield forces int alignment for the structure.  */
        !            51: 
        !            52: #define PCC_BITFIELD_TYPE_MATTERS 1
        !            53: 
        !            54: /* Don't write a `.optim' pseudo; this assembler doesn't handle them.  */
        !            55: 
        !            56: #undef ASM_FILE_START_1
        !            57: #define ASM_FILE_START_1(FILE)
        !            58: 
        !            59: /* Machines that use the AT&T assembler syntax
        !            60:    also return floating point values in an FP register.  */
        !            61: /* Define how to find the value returned by a function.
        !            62:    VALTYPE is the data type of the value (as a tree).
        !            63:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !            64:    otherwise, FUNC is 0.  */
        !            65: 
        !            66: #define VALUE_REGNO(MODE) \
        !            67:   (((MODE) == SFmode || (MODE) == DFmode) ? FIRST_FLOAT_REG : 0)
        !            68: 
        !            69: /* 1 if N is a possible register number for a function value. */
        !            70: 
        !            71: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
        !            72: 
        !            73: #if 0 /* This symbol is expected to exist only on BSD,
        !            74:         and besides, it describes the host rather than the target.
        !            75:         It certainly does not belong here.  */
        !            76: #ifndef MAXPATHLEN
        !            77: #define MAXPATHLEN 1024
        !            78: #endif
        !            79: #endif
        !            80: 
        !            81: /* longjmp may fail to restore the registers if called from the same
        !            82:    function that called setjmp.  To compensate, the compiler avoids
        !            83:    putting variables in registers in functions that use both setjmp
        !            84:    and longjmp.  */
        !            85: 
        !            86: #define NON_SAVING_SETJMP \
        !            87:   (current_function_calls_setjmp && current_function_calls_longjmp)
        !            88: 
        !            89: /* longjmp may fail to restore the stack pointer if the saved frame
        !            90:    pointer is the same as the caller's frame pointer.  Requiring a frame
        !            91:    pointer in any function that calls setjmp or longjmp avoids this
        !            92:    problem, unless setjmp and longjmp are called from the same function.
        !            93:    Since a frame pointer will be required in such a function, it is OK
        !            94:    that the stack pointer is not restored.  */
        !            95: 
        !            96: #undef FRAME_POINTER_REQUIRED
        !            97: #define FRAME_POINTER_REQUIRED \
        !            98:   (current_function_calls_setjmp || current_function_calls_longjmp)
        !            99: 
        !           100: /* Define a few machine-specific details
        !           101:    of the implementation of constructors.
        !           102: 
        !           103:    CTORS_SECTION_ASM_OP should be defined to concatenate
        !           104:    the macro INIT_SECTION_ASM_OP, a newline, and a push instruction
        !           105:    to push a word containing 0 (or some equivalent of that).
        !           106: 
        !           107:    ASM_OUTPUT_CONSTRUCTOR should be defined
        !           108:    to push the address of the constructor.  */
        !           109: 
        !           110: #undef INIT_SECTION_ASM_OP
        !           111: #define INIT_SECTION_ASM_OP     ".section .init,\"x\""
        !           112: 
        !           113: #define CTORS_SECTION_ASM_OP \
        !           114:   INIT_SECTION_ASM_OP "\n"     \
        !           115:   "\tpushl $0\n\t"             \
        !           116:   DATA_SECTION_ASM_OP
        !           117: /* The reason we end with DATA_SECTION_ASM_OP is to prevent the
        !           118:    initial and final table elements (see crtstuff.c) from getting into
        !           119:    the .init section and causing a crash.  */
        !           120: 
        !           121: #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)      \
        !           122:   do {                                         \
        !           123:     init_section ();                           \
        !           124:     fprintf (FILE, "\tpushl $");               \
        !           125:     assemble_name (FILE, NAME);                        \
        !           126:     fprintf (FILE, "\n");                      \
        !           127:   } while (0)

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