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Annotation of gcc/config/i386gas.h, revision 1.1

1.1     ! root        1: /* Definitions for Intel 386 running system V with gnu tools
        !             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: /* Use the bsd assembler syntax.  */
        !            23: /* we need to do this because gas is really a bsd style assembler,
        !            24:  * and so doesn't work well this these att-isms:
        !            25:  *
        !            26:  *  ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
        !            27:  *  ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
        !            28:  *   used to define bss static space
        !            29:  *
        !            30:  * Next is the question of whether to uses underscores.  RMS didn't
        !            31:  * like this idea at first, but since it is now obvious that we
        !            32:  * need this separate tm file for use with gas, at least to get
        !            33:  * dbx debugging info, I think we should also switch to underscores.
        !            34:  * We can keep i386v for real att style output, and the few
        !            35:  * people who want both form will have to compile twice.
        !            36:  */
        !            37: 
        !            38: #include "bsd386.h"
        !            39: 
        !            40: /* these come from bsd386.h, but are specific to sequent */
        !            41: #undef DBX_NO_XREFS
        !            42: #undef DBX_CONTIN_LENGTH
        !            43: 
        !            44: /* By default, target has a 80387.  */
        !            45: 
        !            46: #define TARGET_DEFAULT 1
        !            47: 
        !            48: /* Specify predefined symbols in preprocessor.  */
        !            49: 
        !            50: #define CPP_PREDEFINES "-Dunix -Di386"
        !            51: 
        !            52: /* Allow #sccs in preprocessor.  */
        !            53: 
        !            54: #define SCCS_DIRECTIVE
        !            55: 
        !            56: /* Output #ident as a .ident.  */
        !            57: 
        !            58: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
        !            59: 
        !            60: /* We do not want to output SDB debugging information.  */
        !            61: 
        !            62: #undef SDB_DEBUGGING_INFO
        !            63: 
        !            64: /* We want to output DBX debugging information.  */
        !            65: 
        !            66: #define DBX_DEBUGGING_INFO
        !            67: 
        !            68: /* Implicit library calls should use memcpy, not bcopy, etc.  */
        !            69: 
        !            70: #define TARGET_MEM_FUNCTIONS
        !            71: 
        !            72: #if 0  /* People say gas uses the log as the arg to .align.  */
        !            73: /* When using gas, .align N aligns to an N-byte boundary.  */
        !            74: 
        !            75: #undef ASM_OUTPUT_ALIGN
        !            76: #define ASM_OUTPUT_ALIGN(FILE,LOG)     \
        !            77:      if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
        !            78: #endif
        !            79: 
        !            80: /* Align labels, etc. at 4-byte boundaries.
        !            81:    For the 486, align to 16-byte boundary for sake of cache.  */
        !            82: 
        !            83: #undef ASM_OUTPUT_ALIGN_CODE
        !            84: #define ASM_OUTPUT_ALIGN_CODE(FILE)                    \
        !            85:      fprintf ((FILE), "\t.align %d,0x90\n",            \
        !            86:              TARGET_486 ? 4 : 2);  /* Use log of 16 or log of 4 as arg.  */
        !            87: 
        !            88: /* Align start of loop at 4-byte boundary.  */
        !            89: 
        !            90: #undef ASM_OUTPUT_LOOP_ALIGN
        !            91: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
        !            92:      fprintf ((FILE), "\t.align 2,0x90\n");  /* Use log of 4 as arg.  */
        !            93: 
        !            94: /* Machines that use the AT&T assembler syntax
        !            95:    also return floating point values in an FP register.  */
        !            96: /* Define how to find the value returned by a function.
        !            97:    VALTYPE is the data type of the value (as a tree).
        !            98:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !            99:    otherwise, FUNC is 0.  */
        !           100: 
        !           101: #define VALUE_REGNO(MODE) \
        !           102:   (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
        !           103: 
        !           104: /* 1 if N is a possible register number for a function value. */
        !           105: 
        !           106: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
        !           107: 
        !           108: #undef ASM_FILE_START
        !           109: #define ASM_FILE_START(FILE) \
        !           110:   fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
        !           111: 
        !           112: /* A C statement or statements which output an assembler instruction
        !           113:    opcode to the stdio stream STREAM.  The macro-operand PTR is a
        !           114:    variable of type `char *' which points to the opcode name in its
        !           115:    "internal" form--the form that is written in the machine description.
        !           116: 
        !           117:    GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
        !           118:    So use `repe' instead.  */
        !           119: 
        !           120: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
        !           121: {                                                                      \
        !           122:   if ((PTR)[0] == 'r'                                                  \
        !           123:       && (PTR)[1] == 'e'                                               \
        !           124:       && (PTR)[2] == 'p'                                               \
        !           125:       && (PTR)[3] == 'z')                                              \
        !           126:     {                                                                  \
        !           127:       fprintf (STREAM, "repe");                                                \
        !           128:       (PTR) += 4;                                                      \
        !           129:     }                                                                  \
        !           130: }

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