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Annotation of gcc/config/i386vgas.h, revision 1.1

1.1     ! root        1: /* Definitions for Intel 386 running system V with gnu tools
        !             2:    Except that that really seems to use i386gas.h.  So it's
        !             3:    not clear what, if anything, this file is good for.
        !             4:    Copyright (C) 1988 Free Software Foundation, Inc.
        !             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: 
        !            23: #include "i386.h"
        !            24: /* Use the bsd assembler syntax.  */
        !            25: /* we need to do this because gas is really a bsd style assembler,
        !            26:  * and so doesn't work well this these att-isms:
        !            27:  *
        !            28:  *  ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
        !            29:  *  ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
        !            30:  *   used to define bss static space
        !            31:  *
        !            32:  * Next is the question of whether to uses underscores.  RMS didn't
        !            33:  * like this idea at first, but since it is now obvious that we
        !            34:  * need this separate tm file for use with gas, at least to get
        !            35:  * dbx debugging info.  */
        !            36: 
        !            37: #include "bsd386.h"
        !            38: 
        !            39: /* these come from bsd386.h, but are specific to sequent */
        !            40: #undef DBX_NO_XREFS
        !            41: #undef DBX_CONTIN_LENGTH
        !            42: 
        !            43: /* By default, target has a 80387.  */
        !            44: 
        !            45: #define TARGET_DEFAULT 1
        !            46: 
        !            47: #if 0 /* These aren't right for GNU ld.  */
        !            48: /* Use crt1.o as a startup file and crtn.o as a closing file.  */
        !            49: 
        !            50: #define STARTFILE_SPEC  \
        !            51:   "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
        !            52: 
        !            53: #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
        !            54: #endif
        !            55: 
        !            56: /* Specify predefined symbols in preprocessor.  */
        !            57: 
        !            58: #define CPP_PREDEFINES "-Dunix -Di386"
        !            59: 
        !            60: /* Allow #sccs in preprocessor.  */
        !            61: 
        !            62: #define SCCS_DIRECTIVE
        !            63: 
        !            64: /* Output #ident as a .ident.  */
        !            65: 
        !            66: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
        !            67: 
        !            68: /* We do not want to output SDB debugging information.  */
        !            69: 
        !            70: #undef SDB_DEBUGGING_INFO
        !            71: 
        !            72: /* We want to output DBX debugging information.  */
        !            73: 
        !            74: #define DBX_DEBUGGING_INFO
        !            75: 
        !            76: /* Implicit library calls should use memcpy, not bcopy, etc.  */
        !            77: 
        !            78: #define TARGET_MEM_FUNCTIONS
        !            79: 
        !            80: /* Writing `int' for a bitfield forces int alignment for the structure.  */
        !            81: 
        !            82: #define PCC_BITFIELD_TYPE_MATTERS 1
        !            83: 
        !            84: #undef ASM_FILE_START
        !            85: #define ASM_FILE_START(FILE) \
        !            86:   fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
        !            87: 
        !            88: /* This is how to output a reference to a user-level label named NAME.  */
        !            89: #undef ASM_OUTPUT_LABELREF
        !            90: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
        !            91:   fprintf (FILE, "_%s", NAME)
        !            92: 
        !            93: #if 0  /* People say gas uses the log as the arg to .align.  */
        !            94: /* When using gas, .align N aligns to an N-byte boundary.  */
        !            95: 
        !            96: #undef ASM_OUTPUT_ALIGN
        !            97: #define ASM_OUTPUT_ALIGN(FILE,LOG)     \
        !            98:      if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
        !            99: #endif
        !           100: 
        !           101: /* Align labels, etc. at 4-byte boundaries.  */
        !           102: 
        !           103: #undef ASM_OUTPUT_ALIGN_CODE
        !           104: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
        !           105:      fprintf ((FILE), "\t.align 2,0x90\n");  /* Use log of 4 as arg.  */
        !           106: 
        !           107: /* Machines that use the AT&T assembler syntax
        !           108:    also return floating point values in an FP register.  */
        !           109: /* Define how to find the value returned by a function.
        !           110:    VALTYPE is the data type of the value (as a tree).
        !           111:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !           112:    otherwise, FUNC is 0.  */
        !           113: 
        !           114: #define VALUE_REGNO(MODE) \
        !           115:   (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
        !           116: 
        !           117: /* 1 if N is a possible register number for a function value. */
        !           118: 
        !           119: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
        !           120: 
        !           121: #if 0 /* This symbol is expected to exist only on BSD,
        !           122:         and besides, it describes the host rather than the target.
        !           123:         It certainly does not belong here.  */
        !           124: #ifndef MAXPATHLEN
        !           125: #define MAXPATHLEN 1024
        !           126: #endif
        !           127: #endif

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