1 /* Definitions for Unix assembler syntax for the Intel 80386.
2 Copyright (C) 1988, 1994 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* This file defines the aspects of assembler syntax
22 that are the same for all the i386 Unix systems
23 (though they may differ in non-Unix systems). */
25 /* Define some concatenation macros to concatenate an opcode
26 and one, two or three operands. In other assembler syntaxes
27 they may alter the order of ther operands. */
29 /* Note that the other files fail to use these
30 in some of the places where they should. */
32 #if defined(__STDC__) || defined(ALMOST_STDC)
33 #define AS2(a,b,c) #a " " #b "," #c
34 #define AS2C(b,c) " " #b "," #c
35 #define AS3(a,b,c,d) #a " " #b "," #c "," #d
36 #define AS1(a,b) #a " " #b
38 #define AS1(a,b) "a b"
39 #define AS2(a,b,c) "a b,c"
40 #define AS2C(b,c) " b,c"
41 #define AS3(a,b,c,d) "a b,c,d"
44 /* Define macro used to output shift-double opcodes when the shift
45 count is in %cl. Some assemblers require %cl as an argument;
46 some don't. This macro controls what to do: by default, don't
48 #define AS3_SHIFT_DOUBLE(a,b,c,d) AS2 (a,c,d)
50 /* Output the size-letter for an opcode.
51 CODE is the letter used in an operand spec (L, B, W, S or Q).
52 CH is the corresponding lower case letter
53 (except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS). */
54 #define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))
56 /* Opcode suffix for fullword insn. */
59 /* Prefix for register names in this syntax. */
62 /* Prefix for immediate operands in this syntax. */
65 /* Indirect call instructions should use `*'. */
68 /* Prefix for a memory-operand X. */
69 #define PRINT_PTR(X, FILE)
71 /* Delimiters that surround base reg and index reg. */
72 #define ADDR_BEG(FILE) putc('(', (FILE))
73 #define ADDR_END(FILE) putc(')', (FILE))
75 /* Print an index register (whose rtx is IREG). */
76 #define PRINT_IREG(FILE,IREG) \
78 { fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); } \
81 /* Print an index scale factor SCALE. */
82 #define PRINT_SCALE(FILE,SCALE) \
83 if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))
85 /* Print a base/index combination.
86 BREG is the base reg rtx, IREG is the index reg rtx,
87 and SCALE is the index scale factor (an integer). */
89 #define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
91 if (BREG) PRINT_REG ((BREG), 0, (FILE)); \
93 { PRINT_IREG ((FILE), (IREG)); \
94 PRINT_SCALE ((FILE), (SCALE)); } \
97 /* Define the syntax of pseudo-ops, labels and comments. */
99 /* String containing the assembler's comment-starter. */
101 #define ASM_COMMENT_START "/"
102 #define COMMENT_BEGIN "/"
104 /* Output to assembler file text saying following lines
105 may contain character constants, extra white space, comments, etc. */
107 #define ASM_APP_ON "/APP\n"
109 /* Output to assembler file text saying following lines
110 no longer contain unusual constructs. */
112 #define ASM_APP_OFF "/NO_APP\n"
114 /* Output before read-only data. */
116 #define TEXT_SECTION_ASM_OP ".text"
118 /* Output before writable (initialized) data. */
120 #define DATA_SECTION_ASM_OP ".data"
122 /* Output before writable (uninitialized) data. */
124 #define BSS_SECTION_ASM_OP ".bss"
126 /* This is how to output a command to make the user-level label named NAME
127 defined for reference from other files. */
129 #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
130 (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
132 /* By default, target has a 80387, uses IEEE compatible arithmetic,
133 and returns float values in the 387, ie,
134 (TARGET_80387 | TARGET_IEEE_FP | TARGET_FLOAT_RETURNS_IN_80387) */
136 #define TARGET_DEFAULT 0301
138 /* Floating-point return values come in the FP register. */
140 #define VALUE_REGNO(MODE) \
141 (GET_MODE_CLASS (MODE) == MODE_FLOAT \
142 && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)
144 /* 1 if N is a possible register number for a function value. */
146 #define FUNCTION_VALUE_REGNO_P(N) \
147 ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))