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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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