1 /* Definitions for Intel 386 using GAS.
2 Copyright (C) 1988-2016 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC 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 3, or (at your option)
11 GCC 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 GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Note that i386/seq-gas.h is a GAS configuration that does not use this
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:
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
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.
39 /* these come from i386/bsd.h, but are specific to sequent */
41 #undef DBX_CONTIN_LENGTH
43 /* Ask for COFF symbols. */
45 #define SDB_DEBUGGING_INFO 1
47 /* Output #ident as a .ident. */
49 #undef TARGET_ASM_OUTPUT_IDENT
50 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
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
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. */
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))
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.
71 This is used to align code labels according to Intel recommendations. */
73 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
74 # define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
76 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
77 else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
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.
86 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
87 So use `repe' instead. */
89 #undef ASM_OUTPUT_OPCODE
90 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
96 if ((PTR)[3] == 'z') \
98 fputs ("repe", (STREAM)); \
101 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
103 fputs ("repne", (STREAM)); \
108 ASM_OUTPUT_AVX_PREFIX ((STREAM), (PTR)); \
111 /* Define macro used to output shift-double opcodes when the shift
112 count is in %cl. Some assemblers require %cl as an argument;
115 GAS requires the %cl argument, so override i386/unix.h. */
117 #undef SHIFT_DOUBLE_OMITS_COUNT
118 #define SHIFT_DOUBLE_OMITS_COUNT 0
120 /* The comment-starter string as GAS expects it. */
121 #undef ASM_COMMENT_START
122 #define ASM_COMMENT_START "#"
124 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true