gcc/config/i386/gas.h

   1 /* Definitions for Intel 386 using GAS.
   2    Copyright (C) 1988, 1993, 1994, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   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)
   9 any later version.
  10
  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.
  15
  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.  */
  20
  21 /* Note that i386/seq-gas.h is a GAS configuration that does not use this
  22    file. */
  23
  24 #include "i386/i386.h"
  25
  26 #ifndef YES_UNDERSCORES
  27 /* Define this now, because i386/bsd.h tests it.  */
  28 #define NO_UNDERSCORES
  29 #endif
  30
  31 /* Use the bsd assembler syntax.  */
  32 /* we need to do this because gas is really a bsd style assembler,
  33  * and so doesn't work well this these att-isms:
  34  *
  35  *  ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
  36  *  ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
  37  *   used to define bss static space
  38  *
  39  * Next is the question of whether to uses underscores.  RMS didn't
  40  * like this idea at first, but since it is now obvious that we
  41  * need this separate tm file for use with gas, at least to get
  42  * dbx debugging info, I think we should also switch to underscores.
  43  * We can keep i386v for real att style output, and the few
  44  * people who want both form will have to compile twice.
  45  */
  46
  47 #include "i386/bsd.h"
  48
  49 /* these come from i386/bsd.h, but are specific to sequent */
  50 #undef DBX_NO_XREFS
  51 #undef DBX_CONTIN_LENGTH
  52
  53 /* Ask for COFF symbols.  */
  54
  55 #define SDB_DEBUGGING_INFO
  56
  57 /* Specify predefined symbols in preprocessor.  */
  58
  59 #define CPP_PREDEFINES "-Dunix"
  60 #define CPP_SPEC "%(cpp_cpu) %[cpp_cpu] %{posix:-D_POSIX_SOURCE}"
  61
  62 /* Allow #sccs in preprocessor.  */
  63
  64 #define SCCS_DIRECTIVE
  65
  66 /* Output #ident as a .ident.  */
  67
  68 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
  69
  70 /* Implicit library calls should use memcpy, not bcopy, etc.  */
  71
  72 #define TARGET_MEM_FUNCTIONS
  73
  74 /* In the past there was confusion as to what the argument to .align was
  75    in GAS.  For the last several years the rule has been this: for a.out
  76    file formats that argument is LOG, and for all other file formats the
  77    argument is 1<<LOG.
  78
  79    However, GAS now has .p2align and .balign pseudo-ops so to remove any
  80    doubt or guess work, and since this file is used for both a.out and other
  81    file formats, we use one of them.  */
  82
  83 #if 0 /* ??? However, not every port uses binutils 2.6 yet.  */
  84 #undef ASM_OUTPUT_ALIGN
  85 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
  86   if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
  87 #endif
  88
  89 /* Align labels, etc. at 4-byte boundaries.
  90    For the 486, align to 16-byte boundary for sake of cache.  */
  91
  92 #undef ASM_OUTPUT_ALIGN_CODE
  93 #define ASM_OUTPUT_ALIGN_CODE(FILE) \
  94   fprintf ((FILE), "\t.align %d,0x90\n", i386_align_jumps)
  95
  96 /* Align start of loop at 4-byte boundary.  */
  97
  98 #undef ASM_OUTPUT_LOOP_ALIGN
  99 #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
 100   fprintf ((FILE), "\t.align %d,0x90\n", i386_align_loops)
 101
 102 \f
 103 /* A C statement or statements which output an assembler instruction
 104    opcode to the stdio stream STREAM.  The macro-operand PTR is a
 105    variable of type `char *' which points to the opcode name in its
 106    "internal" form--the form that is written in the machine description.
 107
 108    GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
 109    So use `repe' instead.  */
 110
 111 #define ASM_OUTPUT_OPCODE(STREAM, PTR)  \
 112 {                                                                       \
 113   if ((PTR)[0] == 'r'                                                   \
 114       && (PTR)[1] == 'e'                                                \
 115       && (PTR)[2] == 'p')                                               \
 116     {                                                                   \
 117       if ((PTR)[3] == 'z')                                              \
 118         {                                                               \
 119           fprintf (STREAM, "repe");                                     \
 120           (PTR) += 4;                                                   \
 121         }                                                               \
 122       else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')                      \
 123         {                                                               \
 124           fprintf (STREAM, "repne");                                    \
 125           (PTR) += 5;                                                   \
 126         }                                                               \
 127     }                                                                   \
 128 }
 129
 130 /* Define macro used to output shift-double opcodes when the shift
 131    count is in %cl.  Some assemblers require %cl as an argument;
 132    some don't.
 133
 134    GAS requires the %cl argument, so override i386/unix.h. */
 135
 136 #undef SHIFT_DOUBLE_OMITS_COUNT
 137 #define SHIFT_DOUBLE_OMITS_COUNT 0
 138
 139 /* Print opcodes the way that GAS expects them. */
 140 #define GAS_MNEMONICS 1
 141
 142 #ifdef NO_UNDERSCORES /* If user-symbols don't have underscores,
 143                          then it must take more than `L' to identify
 144                          a label that should be ignored.  */
 145
 146 /* This is how to store into the string BUF
 147    the symbol_ref name of an internal numbered label where
 148    PREFIX is the class of label and NUM is the number within the class.
 149    This is suitable for output with `assemble_name'.  */
 150
 151 #undef ASM_GENERATE_INTERNAL_LABEL
 152 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER)  \
 153     sprintf ((BUF), ".%s%d", (PREFIX), (NUMBER))
 154
 155 /* This is how to output an internal numbered label where
 156    PREFIX is the class of label and NUM is the number within the class.  */
 157
 158 #undef ASM_OUTPUT_INTERNAL_LABEL
 159 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)      \
 160   fprintf (FILE, ".%s%d:\n", PREFIX, NUM)
 161
 162 #endif /* NO_UNDERSCORES */