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Annotation of gcc/config/i386/unix.h, revision 1.1.1.2

1.1       root        1: /* Definitions for Unix assembler syntax for the Intel 80386.
1.1.1.2 ! root        2:    Copyright (C) 1988, 1994 Free Software Foundation, Inc.
1.1       root        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: 
1.1.1.2 ! root       31: #if defined(__STDC__) || defined(ALMOST_STDC)
1.1       root       32: #define AS2(a,b,c) #a " " #b "," #c
1.1.1.2 ! root       33: #define AS2C(b,c) " " #b "," #c
1.1       root       34: #define AS3(a,b,c,d) #a " " #b "," #c "," #d
                     35: #define AS1(a,b) #a " " #b
                     36: #else
                     37: #define AS1(a,b) "a b"
                     38: #define AS2(a,b,c) "a b,c"
1.1.1.2 ! root       39: #define AS2C(b,c) " b,c"
1.1       root       40: #define AS3(a,b,c,d) "a b,c,d"
                     41: #endif  
                     42: 
                     43: /* Define macro used to output shift-double opcodes when the shift
                     44:    count is in %cl.  Some assemblers require %cl as an argument;
                     45:    some don't.  This macro controls what to do: by default, don't
                     46:    print %cl.  */
                     47: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS2 (a,c,d)
                     48: 
                     49: /* Output the size-letter for an opcode.
                     50:    CODE is the letter used in an operand spec (L, B, W, S or Q).
                     51:    CH is the corresponding lower case letter
                     52:      (except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS).  */
                     53: #define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))
                     54: 
                     55: /* Opcode suffix for fullword insn.  */
                     56: #define L_SIZE "l"
                     57: 
                     58: /* Prefix for register names in this syntax.  */
                     59: #define RP "%"
                     60: 
                     61: /* Prefix for immediate operands in this syntax.  */
                     62: #define IP "$"
                     63: 
                     64: /* Indirect call instructions should use `*'.  */
                     65: #define USE_STAR 1
                     66: 
                     67: /* Prefix for a memory-operand X.  */
                     68: #define PRINT_PTR(X, FILE)
                     69: 
                     70: /* Delimiters that surround base reg and index reg.  */
                     71: #define ADDR_BEG(FILE) putc('(', (FILE))
                     72: #define ADDR_END(FILE) putc(')', (FILE))
                     73: 
                     74: /* Print an index register (whose rtx is IREG).  */
                     75: #define PRINT_IREG(FILE,IREG) \
                     76:   do                                                           \
                     77:   { fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); }      \
                     78:   while (0)
                     79:   
                     80: /* Print an index scale factor SCALE.  */
                     81: #define PRINT_SCALE(FILE,SCALE) \
                     82:   if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))
                     83: 
                     84: /* Print a base/index combination.
                     85:    BREG is the base reg rtx, IREG is the index reg rtx,
                     86:    and SCALE is the index scale factor (an integer).  */
                     87: 
                     88: #define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
                     89:   { ADDR_BEG (FILE);                           \
                     90:     if (BREG) PRINT_REG ((BREG), 0, (FILE));   \
                     91:     if ((IREG) != 0)                           \
                     92:       { PRINT_IREG ((FILE), (IREG));           \
                     93:         PRINT_SCALE ((FILE), (SCALE)); }       \
                     94:     ADDR_END (FILE); }
                     95: 
                     96: /* Define the syntax of pseudo-ops, labels and comments.  */
                     97: 
                     98: /* String containing the assembler's comment-starter.  */
                     99: 
                    100: #define ASM_COMMENT_START "/"
                    101: #define COMMENT_BEGIN "/"
                    102: 
                    103: /* Output to assembler file text saying following lines
                    104:    may contain character constants, extra white space, comments, etc.  */
                    105: 
                    106: #define ASM_APP_ON "/APP\n"
                    107: 
                    108: /* Output to assembler file text saying following lines
                    109:    no longer contain unusual constructs.  */
                    110: 
                    111: #define ASM_APP_OFF "/NO_APP\n"
                    112: 
                    113: /* Output before read-only data.  */
                    114: 
                    115: #define TEXT_SECTION_ASM_OP ".text"
                    116: 
                    117: /* Output before writable (initialized) data.  */
                    118: 
                    119: #define DATA_SECTION_ASM_OP ".data"
                    120: 
                    121: /* Output before writable (uninitialized) data.  */
                    122: 
                    123: #define BSS_SECTION_ASM_OP ".bss"
                    124: 
                    125: /* This is how to output a command to make the user-level label named NAME
                    126:    defined for reference from other files.  */
                    127: 
                    128: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
                    129:   (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
                    130: 
                    131: /* By default, target has a 80387, uses IEEE compatible arithmetic,
                    132:    and returns float values in the 387, ie,
                    133:    (TARGET_80387 | TARGET_IEEE_FP | TARGET_FLOAT_RETURNS_IN_80387) */
                    134: 
                    135: #define TARGET_DEFAULT 0301
                    136: 
                    137: /* Floating-point return values come in the FP register.  */
                    138: 
                    139: #define VALUE_REGNO(MODE) \
                    140:   (GET_MODE_CLASS (MODE) == MODE_FLOAT                         \
                    141:    && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)
                    142: 
                    143: /* 1 if N is a possible register number for a function value. */
                    144: 
                    145: #define FUNCTION_VALUE_REGNO_P(N) \
                    146:   ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
                    147: 

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