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git.ipfire.org Git - thirdparty/gcc.git/blob - gcc/config/i386/gas.h
1 /* Definitions for Intel 386 using GAS.
2 Copyright (C) 1988, 1993, 1994, 1996, 2002 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Note that i386/seq-gas.h is a GAS configuration that does not use this
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:
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
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.
40 /* these come from i386/bsd.h, but are specific to sequent */
42 #undef DBX_CONTIN_LENGTH
44 /* Ask for COFF symbols. */
46 #define SDB_DEBUGGING_INFO
48 /* Allow #sccs in preprocessor. */
50 #define SCCS_DIRECTIVE
52 /* Output #ident as a .ident. */
54 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
56 /* Implicit library calls should use memcpy, not bcopy, etc. */
58 #define TARGET_MEM_FUNCTIONS
60 /* In the past there was confusion as to what the argument to .align was
61 in GAS. For the last several years the rule has been this: for a.out
62 file formats that argument is LOG, and for all other file formats the
65 However, GAS now has .p2align and .balign pseudo-ops so to remove any
66 doubt or guess work, and since this file is used for both a.out and other
67 file formats, we use one of them. */
69 #ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
70 #undef ASM_OUTPUT_ALIGN
71 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
72 if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
75 /* A C statement to output to the stdio stream FILE an assembler
76 command to advance the location counter to a multiple of 1<<LOG
77 bytes if it is within MAX_SKIP bytes.
79 This is used to align code labels according to Intel recommendations. */
81 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
82 # define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
84 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
85 else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
89 /* A C statement or statements which output an assembler instruction
90 opcode to the stdio stream STREAM. The macro-operand PTR is a
91 variable of type `char *' which points to the opcode name in its
92 "internal" form--the form that is written in the machine description.
94 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
95 So use `repe' instead. */
97 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
101 && (PTR)[2] == 'p') \
103 if ((PTR)[3] == 'z') \
105 fprintf (STREAM, "repe"); \
108 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
110 fprintf (STREAM, "repne"); \
116 /* Define macro used to output shift-double opcodes when the shift
117 count is in %cl. Some assemblers require %cl as an argument;
120 GAS requires the %cl argument, so override i386/unix.h. */
122 #undef SHIFT_DOUBLE_OMITS_COUNT
123 #define SHIFT_DOUBLE_OMITS_COUNT 0
125 /* Print opcodes the way that GAS expects them. */
126 #define GAS_MNEMONICS 1
128 /* Output at beginning of assembler file. */
129 /* The .file command should always begin the output. */
130 #undef ASM_FILE_START
131 #define ASM_FILE_START(FILE) \
133 if (ix86_asm_dialect == ASM_INTEL) \
134 fputs ("\t.intel_syntax\n", FILE); \
135 output_file_directive (FILE, main_input_filename); \