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1/* Definitions for Intel 386 using GAS.
2 Copyright (C) 1988-2017 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 3, or (at your option)
9any later version.
10
11GCC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3. If not see
18<http://www.gnu.org/licenses/>. */
19
20/* Note that i386/seq-gas.h is a GAS configuration that does not use this
21 file. */
22
23/* Use the bsd assembler syntax. */
24/* we need to do this because gas is really a bsd style assembler,
25 * and so doesn't work well this these att-isms:
26 *
27 * ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
28 * ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
29 * used to define bss static space
30 *
31 * Next is the question of whether to uses underscores. RMS didn't
32 * like this idea at first, but since it is now obvious that we
33 * need this separate tm file for use with gas, at least to get
34 * dbx debugging info, I think we should also switch to underscores.
35 * We can keep i386v for real att style output, and the few
36 * people who want both form will have to compile twice.
37 */
38
39/* these come from i386/bsd.h, but are specific to sequent */
40#undef DBX_NO_XREFS
41#undef DBX_CONTIN_LENGTH
42
43/* Output #ident as a .ident. */
44
45#undef TARGET_ASM_OUTPUT_IDENT
46#define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
47
48/* In the past there was confusion as to what the argument to .align was
49 in GAS. For the last several years the rule has been this: for a.out
50 file formats that argument is LOG, and for all other file formats the
51 argument is 1<<LOG.
52
53 However, GAS now has .p2align and .balign pseudo-ops so to remove any
54 doubt or guess work, and since this file is used for both a.out and other
55 file formats, we use one of them. */
56
57#ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
58#undef ASM_OUTPUT_ALIGN
59#define ASM_OUTPUT_ALIGN(FILE,LOG) \
60 if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
61#endif
62
63/* A C statement to output to the stdio stream FILE an assembler
64 command to advance the location counter to a multiple of 1<<LOG
65 bytes if it is within MAX_SKIP bytes.
66
67 This is used to align code labels according to Intel recommendations. */
68
69#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
70# define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
71 if ((LOG) != 0) {\
72 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
73 else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
74 }
75#endif
76
77/* A C statement or statements which output an assembler instruction
78 opcode to the stdio stream STREAM. The macro-operand PTR is a
79 variable of type `char *' which points to the opcode name in its
80 "internal" form--the form that is written in the machine description.
81
82 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
83 So use `repe' instead. */
84
85#undef ASM_OUTPUT_OPCODE
86#define ASM_OUTPUT_OPCODE(STREAM, PTR) \
87{ \
88 if ((PTR)[0] == 'r' \
89 && (PTR)[1] == 'e' \
90 && (PTR)[2] == 'p') \
91 { \
92 if ((PTR)[3] == 'z') \
93 { \
94 fputs ("repe", (STREAM)); \
95 (PTR) += 4; \
96 } \
97 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
98 { \
99 fputs ("repne", (STREAM)); \
100 (PTR) += 5; \
101 } \
102 } \
103 else \
104 ASM_OUTPUT_AVX_PREFIX ((STREAM), (PTR)); \
105}
106
107/* Define macro used to output shift-double opcodes when the shift
108 count is in %cl. Some assemblers require %cl as an argument;
109 some don't.
110
111 GAS requires the %cl argument, so override i386/unix.h. */
112
113#undef SHIFT_DOUBLE_OMITS_COUNT
114#define SHIFT_DOUBLE_OMITS_COUNT 0
115
116/* The comment-starter string as GAS expects it. */
117#undef ASM_COMMENT_START
118#define ASM_COMMENT_START "#"
119
120#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
121

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