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comparison gcc/config/i386/gas.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Definitions for Intel 386 using GAS.
2 Copyright (C) 1988, 1993, 1994, 1996, 2002, 2004, 2007, 2008
3 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 /* Note that i386/seq-gas.h is a GAS configuration that does not use this
22 file. */
23
24 /* Use the bsd assembler syntax. */
25 /* we need to do this because gas is really a bsd style assembler,
26 * and so doesn't work well this these att-isms:
27 *
28 * ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
29 * ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
30 * used to define bss static space
31 *
32 * Next is the question of whether to uses underscores. RMS didn't
33 * like this idea at first, but since it is now obvious that we
34 * need this separate tm file for use with gas, at least to get
35 * dbx debugging info, I think we should also switch to underscores.
36 * We can keep i386v for real att style output, and the few
37 * people who want both form will have to compile twice.
38 */
39
40 /* these come from i386/bsd.h, but are specific to sequent */
41 #undef DBX_NO_XREFS
42 #undef DBX_CONTIN_LENGTH
43
44 /* Ask for COFF symbols. */
45
46 #define SDB_DEBUGGING_INFO 1
47
48 /* Output #ident as a .ident. */
49
50 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
51
52 /* In the past there was confusion as to what the argument to .align was
53 in GAS. For the last several years the rule has been this: for a.out
54 file formats that argument is LOG, and for all other file formats the
55 argument is 1<<LOG.
56
57 However, GAS now has .p2align and .balign pseudo-ops so to remove any
58 doubt or guess work, and since this file is used for both a.out and other
59 file formats, we use one of them. */
60
61 #ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
62 #undef ASM_OUTPUT_ALIGN
63 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
64 if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
65 #endif
66
67 /* A C statement to output to the stdio stream FILE an assembler
68 command to advance the location counter to a multiple of 1<<LOG
69 bytes if it is within MAX_SKIP bytes.
70
71 This is used to align code labels according to Intel recommendations. */
72
73 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
74 # define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
75 if ((LOG) != 0) {\
76 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
77 else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
78 }
79 #endif
80
81 /* A C statement or statements which output an assembler instruction
82 opcode to the stdio stream STREAM. The macro-operand PTR is a
83 variable of type `char *' which points to the opcode name in its
84 "internal" form--the form that is written in the machine description.
85
86 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
87 So use `repe' instead. */
88
89 #undef ASM_OUTPUT_OPCODE
90 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
91 { \
92 if ((PTR)[0] == 'r' \
93 && (PTR)[1] == 'e' \
94 && (PTR)[2] == 'p') \
95 { \
96 if ((PTR)[3] == 'z') \
97 { \
98 fprintf (STREAM, "repe"); \
99 (PTR) += 4; \
100 } \
101 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
102 { \
103 fprintf (STREAM, "repne"); \
104 (PTR) += 5; \
105 } \
106 } \
107 else \
108 ASM_OUTPUT_AVX_PREFIX ((STREAM), (PTR)); \
109 }
110
111 /* Define macro used to output shift-double opcodes when the shift
112 count is in %cl. Some assemblers require %cl as an argument;
113 some don't.
114
115 GAS requires the %cl argument, so override i386/unix.h. */
116
117 #undef SHIFT_DOUBLE_OMITS_COUNT
118 #define SHIFT_DOUBLE_OMITS_COUNT 0
119
120 /* Print opcodes the way that GAS expects them. */
121 #define GAS_MNEMONICS 1
122
123 /* The comment-starter string as GAS expects it. */
124 #undef ASM_COMMENT_START
125 #define ASM_COMMENT_START "#"
126
127 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true