gas.h revision 117395 
1/* Definitions for Intel 386 using GAS.
2   Copyright (C) 1988, 1993, 1994, 1996, 2002 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC 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 2, or (at your option)
9any later version.
10
11GNU CC 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 GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
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/* Implicit library calls should use memcpy, not bcopy, etc.  */
53
54#define TARGET_MEM_FUNCTIONS
55
56/* In the past there was confusion as to what the argument to .align was
57   in GAS.  For the last several years the rule has been this: for a.out
58   file formats that argument is LOG, and for all other file formats the
59   argument is 1<<LOG.
60
61   However, GAS now has .p2align and .balign pseudo-ops so to remove any
62   doubt or guess work, and since this file is used for both a.out and other
63   file formats, we use one of them.  */
64
65#ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
66#undef ASM_OUTPUT_ALIGN
67#define ASM_OUTPUT_ALIGN(FILE,LOG) \
68  if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
69#endif
70
71/* A C statement to output to the stdio stream FILE an assembler
72   command to advance the location counter to a multiple of 1<<LOG
73   bytes if it is within MAX_SKIP bytes.
74
75   This is used to align code labels according to Intel recommendations.  */
76
77#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
78#  define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
79     if ((LOG) != 0) {\
80       if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
81       else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
82     }
83#endif
84
85/* A C statement or statements which output an assembler instruction
86   opcode to the stdio stream STREAM.  The macro-operand PTR is a
87   variable of type `char *' which points to the opcode name in its
88   "internal" form--the form that is written in the machine description.
89
90   GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
91   So use `repe' instead.  */
92
93#define ASM_OUTPUT_OPCODE(STREAM, PTR)	\
94{									\
95  if ((PTR)[0] == 'r'							\
96      && (PTR)[1] == 'e'						\
97      && (PTR)[2] == 'p')						\
98    {									\
99      if ((PTR)[3] == 'z')						\
100	{								\
101	  fprintf (STREAM, "repe");					\
102	  (PTR) += 4;							\
103	}								\
104      else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')			\
105	{								\
106	  fprintf (STREAM, "repne");					\
107	  (PTR) += 5;							\
108	}								\
109    }									\
110}
111
112/* Define macro used to output shift-double opcodes when the shift
113   count is in %cl.  Some assemblers require %cl as an argument;
114   some don't.
115
116   GAS requires the %cl argument, so override i386/unix.h.  */
117
118#undef SHIFT_DOUBLE_OMITS_COUNT
119#define SHIFT_DOUBLE_OMITS_COUNT 0
120
121/* Print opcodes the way that GAS expects them.  */
122#define GAS_MNEMONICS 1
123
124/* Output at beginning of assembler file.  */
125/* The .file command should always begin the output.  */
126#undef ASM_FILE_START
127#define ASM_FILE_START(FILE)						\
128  do {									\
129	if (ix86_asm_dialect == ASM_INTEL)				\
130	  fputs ("\t.intel_syntax\n", FILE);				\
131        output_file_directive (FILE, main_input_filename);		\
132  } while (0)
133