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

1.1     ! root        1: /* Definitions for Unix assembler syntax for the Intel 80386.
        !             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: /* This file defines the aspects of assembler syntax
        !            21:    that are the same for all the i386 Unix systems
        !            22:    (though they may differ in non-Unix systems).  */
        !            23: 
        !            24: /* Define some concatenation macros to concatenate an opcode
        !            25:    and one, two or three operands.  In other assembler syntaxes
        !            26:    they may alter the order of ther operands.  */
        !            27: 
        !            28: /* Note that the other files fail to use these
        !            29:    in some of the places where they should.  */
        !            30: 
        !            31: #ifdef __STDC__
        !            32: #define AS2(a,b,c) #a " " #b "," #c
        !            33: #define AS3(a,b,c,d) #a " " #b "," #c "," #d
        !            34: #define AS1(a,b) #a " " #b
        !            35: #else
        !            36: #define AS1(a,b) "a b"
        !            37: #define AS2(a,b,c) "a b,c"
        !            38: #define AS3(a,b,c,d) "a b,c,d"
        !            39: #endif  
        !            40: 
        !            41: /* Define macro used to output shift-double opcodes when the shift
        !            42:    count is in %cl.  Some assemblers require %cl as an argument;
        !            43:    some don't.  This macro controls what to do: by default, don't
        !            44:    print %cl.  */
        !            45: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS2 (a,c,d)
        !            46: 
        !            47: /* Output the size-letter for an opcode.
        !            48:    CODE is the letter used in an operand spec (L, B, W, S or Q).
        !            49:    CH is the corresponding lower case letter
        !            50:      (except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS).  */
        !            51: #define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))
        !            52: 
        !            53: /* Opcode suffix for fullword insn.  */
        !            54: #define L_SIZE "l"
        !            55: 
        !            56: /* Prefix for register names in this syntax.  */
        !            57: #define RP "%"
        !            58: 
        !            59: /* Prefix for immediate operands in this syntax.  */
        !            60: #define IP "$"
        !            61: 
        !            62: /* Indirect call instructions should use `*'.  */
        !            63: #define USE_STAR 1
        !            64: 
        !            65: /* Prefix for a memory-operand X.  */
        !            66: #define PRINT_PTR(X, FILE)
        !            67: 
        !            68: /* Delimiters that surround base reg and index reg.  */
        !            69: #define ADDR_BEG(FILE) putc('(', (FILE))
        !            70: #define ADDR_END(FILE) putc(')', (FILE))
        !            71: 
        !            72: /* Print an index register (whose rtx is IREG).  */
        !            73: #define PRINT_IREG(FILE,IREG) \
        !            74:   do                                                           \
        !            75:   { fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); }      \
        !            76:   while (0)
        !            77:   
        !            78: /* Print an index scale factor SCALE.  */
        !            79: #define PRINT_SCALE(FILE,SCALE) \
        !            80:   if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))
        !            81: 
        !            82: /* Print a base/index combination.
        !            83:    BREG is the base reg rtx, IREG is the index reg rtx,
        !            84:    and SCALE is the index scale factor (an integer).  */
        !            85: 
        !            86: #define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
        !            87:   { ADDR_BEG (FILE);                           \
        !            88:     if (BREG) PRINT_REG ((BREG), 0, (FILE));   \
        !            89:     if ((IREG) != 0)                           \
        !            90:       { PRINT_IREG ((FILE), (IREG));           \
        !            91:         PRINT_SCALE ((FILE), (SCALE)); }       \
        !            92:     ADDR_END (FILE); }
        !            93: 
        !            94: /* Define the syntax of pseudo-ops, labels and comments.  */
        !            95: 
        !            96: /* String containing the assembler's comment-starter.  */
        !            97: 
        !            98: #define ASM_COMMENT_START "/"
        !            99: #define COMMENT_BEGIN "/"
        !           100: 
        !           101: /* Output to assembler file text saying following lines
        !           102:    may contain character constants, extra white space, comments, etc.  */
        !           103: 
        !           104: #define ASM_APP_ON "/APP\n"
        !           105: 
        !           106: /* Output to assembler file text saying following lines
        !           107:    no longer contain unusual constructs.  */
        !           108: 
        !           109: #define ASM_APP_OFF "/NO_APP\n"
        !           110: 
        !           111: /* Output before read-only data.  */
        !           112: 
        !           113: #define TEXT_SECTION_ASM_OP ".text"
        !           114: 
        !           115: /* Output before writable (initialized) data.  */
        !           116: 
        !           117: #define DATA_SECTION_ASM_OP ".data"
        !           118: 
        !           119: /* Output before writable (uninitialized) data.  */
        !           120: 
        !           121: #define BSS_SECTION_ASM_OP ".bss"
        !           122: 
        !           123: /* This is how to output a command to make the user-level label named NAME
        !           124:    defined for reference from other files.  */
        !           125: 
        !           126: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
        !           127:   (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
        !           128: 
        !           129: /* By default, target has a 80387, uses IEEE compatible arithmetic,
        !           130:    and returns float values in the 387, ie,
        !           131:    (TARGET_80387 | TARGET_IEEE_FP | TARGET_FLOAT_RETURNS_IN_80387) */
        !           132: 
        !           133: #define TARGET_DEFAULT 0301
        !           134: 
        !           135: /* Floating-point return values come in the FP register.  */
        !           136: 
        !           137: #define VALUE_REGNO(MODE) \
        !           138:   (GET_MODE_CLASS (MODE) == MODE_FLOAT                         \
        !           139:    && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)
        !           140: 
        !           141: /* 1 if N is a possible register number for a function value. */
        !           142: 
        !           143: #define FUNCTION_VALUE_REGNO_P(N) \
        !           144:   ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
        !           145: 

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