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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
1.1.1.3 ! root 18: the Free Software Foundation, 59 Temple Place - Suite 330,
! 19: Boston, MA 02111-1307, USA. */
1.1 root 20:
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). */
24:
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. */
28:
29: /* Note that the other files fail to use these
30: in some of the places where they should. */
31:
1.1.1.2 root 32: #if defined(__STDC__) || defined(ALMOST_STDC)
1.1 root 33: #define AS2(a,b,c) #a " " #b "," #c
1.1.1.2 root 34: #define AS2C(b,c) " " #b "," #c
1.1 root 35: #define AS3(a,b,c,d) #a " " #b "," #c "," #d
36: #define AS1(a,b) #a " " #b
37: #else
38: #define AS1(a,b) "a b"
39: #define AS2(a,b,c) "a b,c"
1.1.1.2 root 40: #define AS2C(b,c) " b,c"
1.1 root 41: #define AS3(a,b,c,d) "a b,c,d"
42: #endif
43:
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
47: print %cl. */
48: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS2 (a,c,d)
49:
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))
55:
56: /* Opcode suffix for fullword insn. */
57: #define L_SIZE "l"
58:
59: /* Prefix for register names in this syntax. */
60: #define RP "%"
61:
62: /* Prefix for immediate operands in this syntax. */
63: #define IP "$"
64:
65: /* Indirect call instructions should use `*'. */
66: #define USE_STAR 1
67:
68: /* Prefix for a memory-operand X. */
69: #define PRINT_PTR(X, FILE)
70:
71: /* Delimiters that surround base reg and index reg. */
72: #define ADDR_BEG(FILE) putc('(', (FILE))
73: #define ADDR_END(FILE) putc(')', (FILE))
74:
75: /* Print an index register (whose rtx is IREG). */
76: #define PRINT_IREG(FILE,IREG) \
77: do \
78: { fputs (",", (FILE)); PRINT_REG ((IREG), 0, (FILE)); } \
79: while (0)
80:
81: /* Print an index scale factor SCALE. */
82: #define PRINT_SCALE(FILE,SCALE) \
83: if ((SCALE) != 1) fprintf ((FILE), ",%d", (SCALE))
84:
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). */
88:
89: #define PRINT_B_I_S(BREG,IREG,SCALE,FILE) \
90: { ADDR_BEG (FILE); \
91: if (BREG) PRINT_REG ((BREG), 0, (FILE)); \
92: if ((IREG) != 0) \
93: { PRINT_IREG ((FILE), (IREG)); \
94: PRINT_SCALE ((FILE), (SCALE)); } \
95: ADDR_END (FILE); }
96:
97: /* Define the syntax of pseudo-ops, labels and comments. */
98:
99: /* String containing the assembler's comment-starter. */
100:
101: #define ASM_COMMENT_START "/"
102: #define COMMENT_BEGIN "/"
103:
104: /* Output to assembler file text saying following lines
105: may contain character constants, extra white space, comments, etc. */
106:
107: #define ASM_APP_ON "/APP\n"
108:
109: /* Output to assembler file text saying following lines
110: no longer contain unusual constructs. */
111:
112: #define ASM_APP_OFF "/NO_APP\n"
113:
114: /* Output before read-only data. */
115:
116: #define TEXT_SECTION_ASM_OP ".text"
117:
118: /* Output before writable (initialized) data. */
119:
120: #define DATA_SECTION_ASM_OP ".data"
121:
122: /* Output before writable (uninitialized) data. */
123:
124: #define BSS_SECTION_ASM_OP ".bss"
125:
126: /* This is how to output a command to make the user-level label named NAME
127: defined for reference from other files. */
128:
129: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
130: (fputs (".globl ", FILE), assemble_name (FILE, NAME), fputs ("\n", FILE))
131:
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) */
135:
136: #define TARGET_DEFAULT 0301
137:
138: /* Floating-point return values come in the FP register. */
139:
140: #define VALUE_REGNO(MODE) \
141: (GET_MODE_CLASS (MODE) == MODE_FLOAT \
142: && TARGET_FLOAT_RETURNS_IN_80387 ? FIRST_FLOAT_REG : 0)
143:
144: /* 1 if N is a possible register number for a function value. */
145:
146: #define FUNCTION_VALUE_REGNO_P(N) \
147: ((N) == 0 || ((N)== FIRST_FLOAT_REG && TARGET_FLOAT_RETURNS_IN_80387))
148:
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