[gcc.git] / gcc / config / i386 / gas.h

/* Definitions for Intel 386 using GAS.
   Copyright (C) 1988, 1993, 1994, 1996, 2002 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Note that i386/seq-gas.h is a GAS configuration that does not use this
   file.  */

/* Use the bsd assembler syntax.  */
/* we need to do this because gas is really a bsd style assembler,
 * and so doesn't work well this these att-isms:
 *
 *  ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
 *  ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
 *   used to define bss static space
 *
 * Next is the question of whether to uses underscores.  RMS didn't
 * like this idea at first, but since it is now obvious that we
 * need this separate tm file for use with gas, at least to get
 * dbx debugging info, I think we should also switch to underscores.
 * We can keep i386v for real att style output, and the few
 * people who want both form will have to compile twice.
 */

/* these come from i386/bsd.h, but are specific to sequent */
#undef DBX_NO_XREFS
#undef DBX_CONTIN_LENGTH

/* Ask for COFF symbols.  */

#define SDB_DEBUGGING_INFO 1

/* Output #ident as a .ident.  */

#define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);

/* In the past there was confusion as to what the argument to .align was
   in GAS.  For the last several years the rule has been this: for a.out
   file formats that argument is LOG, and for all other file formats the
   argument is 1<<LOG.

   However, GAS now has .p2align and .balign pseudo-ops so to remove any
   doubt or guess work, and since this file is used for both a.out and other
   file formats, we use one of them.  */

#ifdef HAVE_GAS_BALIGN_AND_P2ALIGN 
#undef ASM_OUTPUT_ALIGN
#define ASM_OUTPUT_ALIGN(FILE,LOG) \
  if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
#endif

/* A C statement to output to the stdio stream FILE an assembler
   command to advance the location counter to a multiple of 1<<LOG
   bytes if it is within MAX_SKIP bytes.

   This is used to align code labels according to Intel recommendations.  */

#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
#  define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
     if ((LOG) != 0) {\
       if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
       else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
     }
#endif
\f
/* A C statement or statements which output an assembler instruction
   opcode to the stdio stream STREAM.  The macro-operand PTR is a
   variable of type `char *' which points to the opcode name in its
   "internal" form--the form that is written in the machine description.

   GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
   So use `repe' instead.  */

#define ASM_OUTPUT_OPCODE(STREAM, PTR)	\
{									\
  if ((PTR)[0] == 'r'							\
      && (PTR)[1] == 'e'						\
      && (PTR)[2] == 'p')						\
    {									\
      if ((PTR)[3] == 'z')						\
	{								\
	  fprintf (STREAM, "repe");					\
	  (PTR) += 4;							\
	}								\
      else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')			\
	{								\
	  fprintf (STREAM, "repne");					\
	  (PTR) += 5;							\
	}								\
    }									\
}

/* Define macro used to output shift-double opcodes when the shift
   count is in %cl.  Some assemblers require %cl as an argument;
   some don't.

   GAS requires the %cl argument, so override i386/unix.h.  */

#undef SHIFT_DOUBLE_OMITS_COUNT
#define SHIFT_DOUBLE_OMITS_COUNT 0

/* Print opcodes the way that GAS expects them.  */
#define GAS_MNEMONICS 1

#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
Commit	Line	Data
6e9e65c6	1	/* Definitions for Intel 386 using GAS.
39ed301b	2	Copyright (C) 1988, 1993, 1994, 1996, 2002 Free Software Foundation, Inc.
c3878c43	3
e20285ad	4	This file is part of GCC.
c3878c43	5
e20285ad	6	GCC is free software; you can redistribute it and/or modify
c3878c43 RS	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)
	9	any later version.
	10
e20285ad	11	GCC is distributed in the hope that it will be useful,
c3878c43 RS	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.
	15
	16	You should have received a copy of the GNU General Public License
e20285ad	17	along with GCC; see the file COPYING. If not, write to
97aadbb9 RK	18	the Free Software Foundation, 59 Temple Place - Suite 330,
97aadbb9 RK	19	Boston, MA 02111-1307, USA. */
c3878c43	20
3382566a	21	/* Note that i386/seq-gas.h is a GAS configuration that does not use this
892a2d68	22	file. */
c3878c43	23
c3878c43 RS	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
3382566a	40	/* these come from i386/bsd.h, but are specific to sequent */
c3878c43 RS	41	#undef DBX_NO_XREFS
	42	#undef DBX_CONTIN_LENGTH
	43
8cac6b1a RS	44	/* Ask for COFF symbols. */
8cac6b1a RS	45
23532de9	46	#define SDB_DEBUGGING_INFO 1
8cac6b1a	47
c3878c43 RS	48	/* Output #ident as a .ident. */
	49
	50	#define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
	51
6e9e65c6 DE	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. */
c3878c43	60
00ccc16d	61	#ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
c3878c43	62	#undef ASM_OUTPUT_ALIGN
6e9e65c6 DE	63	#define ASM_OUTPUT_ALIGN(FILE,LOG) \
6e9e65c6 DE	64	if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
d45e8c4c	65	#endif
9e423e6d JW	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) \
0385ba57	75	if ((LOG) != 0) {\
8401285e	76	if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
a059f76b	77	else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
0385ba57	78	}
9e423e6d	79	#endif
c3878c43	80	\f
726c68df RS	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	#define ASM_OUTPUT_OPCODE(STREAM, PTR) \
	90	{ \
	91	if ((PTR)[0] == 'r' \
	92	&& (PTR)[1] == 'e' \
84d82177	93	&& (PTR)[2] == 'p') \
726c68df	94	{ \
84d82177 JVA	95	if ((PTR)[3] == 'z') \
	96	{ \
	97	fprintf (STREAM, "repe"); \
	98	(PTR) += 4; \
	99	} \
	100	else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
	101	{ \
	102	fprintf (STREAM, "repne"); \
	103	(PTR) += 5; \
	104	} \
726c68df RS	105	} \
726c68df RS	106	}
56c0e8fa JVA	107
	108	/* Define macro used to output shift-double opcodes when the shift
	109	count is in %cl. Some assemblers require %cl as an argument;
	110	some don't.
	111
892a2d68	112	GAS requires the %cl argument, so override i386/unix.h. */
56c0e8fa	113
dedaa36d SC	114	#undef SHIFT_DOUBLE_OMITS_COUNT
dedaa36d SC	115	#define SHIFT_DOUBLE_OMITS_COUNT 0
56c0e8fa	116
892a2d68	117	/* Print opcodes the way that GAS expects them. */
56c0e8fa	118	#define GAS_MNEMONICS 1
e28d6e8a	119
1bc7c5b6	120	#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true