gcc/config/i386/gas.h

   1 /* Definitions for Intel 386 using GAS.
   2    Copyright (C) 1988, 1993, 1994, 1996, 2002, 2004, 2007, 2008
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  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 #undef TARGET_ASM_OUTPUT_IDENT
  51 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive
  52
  53 /* In the past there was confusion as to what the argument to .align was
  54    in GAS.  For the last several years the rule has been this: for a.out
  55    file formats that argument is LOG, and for all other file formats the
  56    argument is 1<<LOG.
  57
  58    However, GAS now has .p2align and .balign pseudo-ops so to remove any
  59    doubt or guess work, and since this file is used for both a.out and other
  60    file formats, we use one of them.  */
  61
  62 #ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
  63 #undef ASM_OUTPUT_ALIGN
  64 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
  65   if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
  66 #endif
  67
  68 /* A C statement to output to the stdio stream FILE an assembler
  69    command to advance the location counter to a multiple of 1<<LOG
  70    bytes if it is within MAX_SKIP bytes.
  71
  72    This is used to align code labels according to Intel recommendations.  */
  73
  74 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
  75 #  define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
  76      if ((LOG) != 0) {\
  77        if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
  78        else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
  79      }
  80 #endif
  81 \f
  82 /* A C statement or statements which output an assembler instruction
  83    opcode to the stdio stream STREAM.  The macro-operand PTR is a
  84    variable of type `char *' which points to the opcode name in its
  85    "internal" form--the form that is written in the machine description.
  86
  87    GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
  88    So use `repe' instead.  */
  89
  90 #undef ASM_OUTPUT_OPCODE
  91 #define ASM_OUTPUT_OPCODE(STREAM, PTR)  \
  92 {                                                                       \
  93   if ((PTR)[0] == 'r'                                                   \
  94       && (PTR)[1] == 'e'                                                \
  95       && (PTR)[2] == 'p')                                               \
  96     {                                                                   \
  97       if ((PTR)[3] == 'z')                                              \
  98         {                                                               \
  99           fputs ("repe", (STREAM));                                     \
 100           (PTR) += 4;                                                   \
 101         }                                                               \
 102       else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')                      \
 103         {                                                               \
 104           fputs ("repne", (STREAM));                                    \
 105           (PTR) += 5;                                                   \
 106         }                                                               \
 107     }                                                                   \
 108   else                                                                  \
 109     ASM_OUTPUT_AVX_PREFIX ((STREAM), (PTR));                            \
 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 /* The comment-starter string as GAS expects it. */
 122 #undef ASM_COMMENT_START
 123 #define ASM_COMMENT_START "#"
 124
 125 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true