1 /* Definitions for Unix assembler syntax for the Intel 80386.
2 Copyright (C) 1988, 1994, 1999 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 SHIFT_DOUBLE_OMITS_COUNT 1
49 #define AS3_SHIFT_DOUBLE(a,b,c,d) \
50 (SHIFT_DOUBLE_OMITS_COUNT ? AS2 (a,c,d) : AS3 (a,b,c,d))
52 /* Output the size-letter for an opcode.
53 CODE is the letter used in an operand spec (L, B, W, S or Q).
54 CH is the corresponding lower case letter
55 (except if CODE is `Q' then CH is `l', unless GAS_MNEMONICS). */
56 #define PUT_OP_SIZE(CODE,CH,FILE) putc (CH,(FILE))
58 /* Opcode suffix for fullword insn. */
61 /* Prefix for register names in this syntax. */
64 /* Prefix for immediate operands in this syntax. */
67 /* Indirect call instructions should use `*'. */
70 /* Prefix for a memory-operand X. */
71 #define PRINT_PTR(X, FILE)
73 /* Delimiters that surround base reg and index reg. */
74 #define ADDR_BEG(FILE) putc('(', (FILE))
75 #define ADDR_END(FILE) putc(')', (FILE))
77 /* Print an index register (whose rtx is IREG). */
78 #define PRINT_IREG(FILE,IREG) \
80 { fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); } \
83 /* Print an index scale factor SCALE. */
84 #define PRINT_SCALE(FILE,SCALE) \
85 if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))
87 /* Print a base/index combination.
88 BREG is the base reg rtx, IREG is the index reg rtx,
89 and SCALE is the index scale factor (an integer). */
91 #define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
93 if (BREG) PRINT_REG ((BREG), 0, (FILE)); \
95 { PRINT_IREG ((FILE), (IREG)); \
96 PRINT_SCALE ((FILE), (SCALE)); } \
99 /* Define the syntax of pseudo-ops, labels and comments. */
101 /* String containing the assembler's comment-starter. */
103 #define ASM_COMMENT_START "/"
105 /* Output to assembler file text saying following lines
106 may contain character constants, extra white space, comments, etc. */
108 #define ASM_APP_ON "/APP\n"
110 /* Output to assembler file text saying following lines
111 no longer contain unusual constructs. */
113 #define ASM_APP_OFF "/NO_APP\n"
115 /* Output before read-only data. */
117 #define TEXT_SECTION_ASM_OP ".text"
119 /* Output before writable (initialized) data. */
121 #define DATA_SECTION_ASM_OP ".data"
123 /* Output before writable (uninitialized) data. */
125 #define BSS_SECTION_ASM_OP ".bss"
127 /* This is how to output a command to make the user-level label named NAME
128 defined for reference from other files. */
130 #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
131 (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
133 /* By default, target has a 80387, uses IEEE compatible arithmetic,
134 and returns float values in the 387. */
136 #define TARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS)
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))
149 /* Output code to add DELTA to the first argument, and then jump to FUNCTION.
150 Used for C++ multiple inheritance. */
151 #define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION) \
155 if (i386_regparm > 0) \
156 parm = TYPE_ARG_TYPES (TREE_TYPE (function)); \
159 for (; parm; parm = TREE_CHAIN (parm)) \
160 if (TREE_VALUE (parm) == void_type_node) \
162 fprintf (FILE, "\taddl $%d,%s\n", DELTA, \
164 : aggregate_value_p (TREE_TYPE (TREE_TYPE (FUNCTION))) ? "8(%esp)" \
170 xops[0] = pic_offset_table_rtx; \
171 xops[1] = (rtx) gen_label_rtx (); \
173 if (i386_regparm > 2) \
175 output_asm_insn ("push%L0 %0", xops); \
176 output_asm_insn (AS1 (call,%P1), xops); \
177 ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", CODE_LABEL_NUMBER (xops[1])); \
178 output_asm_insn (AS1 (pop%L0,%0), xops); \
179 output_asm_insn ("addl $%__GLOBAL_OFFSET_TABLE_+[.-%P1],%0", xops); \
180 fprintf (FILE, "\tmovl "); \
181 assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0)); \
182 fprintf (FILE, "@GOT(%%ebx),%%ecx\n\tpopl %%ebx\n\tjmp *%%ecx\n"); \
186 fprintf (FILE, "\tjmp "); \
187 assemble_name (FILE, XSTR (XEXP (DECL_RTL (FUNCTION), 0), 0)); \
188 fprintf (FILE, "\n"); \