gcc/config/i386/gas.h

   1 /* Definitions for Intel 386 running system V with gnu tools
   2    Copyright (C) 1988 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Note that seq386gas.h is a GAS configuration that does not use this
  21    file. */
  22
  23 #include "i386.h"
  24
  25 #ifndef YES_UNDERSCORES
  26 /* Define this now, because bsd386.h tests it.  */
  27 #define NO_UNDERSCORES
  28 #endif
  29
  30 /* Use the bsd assembler syntax.  */
  31 /* we need to do this because gas is really a bsd style assembler,
  32  * and so doesn't work well this these att-isms:
  33  *
  34  *  ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
  35  *  ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
  36  *   used to define bss static space
  37  *
  38  * Next is the question of whether to uses underscores.  RMS didn't
  39  * like this idea at first, but since it is now obvious that we
  40  * need this separate tm file for use with gas, at least to get
  41  * dbx debugging info, I think we should also switch to underscores.
  42  * We can keep i386v for real att style output, and the few
  43  * people who want both form will have to compile twice.
  44  */
  45
  46 #include "bsd386.h"
  47
  48 /* these come from bsd386.h, but are specific to sequent */
  49 #undef DBX_NO_XREFS
  50 #undef DBX_CONTIN_LENGTH
  51
  52 /* Ask for COFF symbols.  */
  53
  54 #define SDB_DEBUGGING_INFO
  55
  56 /* Specify predefined symbols in preprocessor.  */
  57
  58 #define CPP_PREDEFINES "-Dunix -Di386"
  59 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
  60
  61 /* Allow #sccs in preprocessor.  */
  62
  63 #define SCCS_DIRECTIVE
  64
  65 /* Output #ident as a .ident.  */
  66
  67 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
  68
  69 /* Implicit library calls should use memcpy, not bcopy, etc.  */
  70
  71 #define TARGET_MEM_FUNCTIONS
  72
  73 #if 0  /* People say gas uses the log as the arg to .align.  */
  74 /* When using gas, .align N aligns to an N-byte boundary.  */
  75
  76 #undef ASM_OUTPUT_ALIGN
  77 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
  78      if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
  79 #endif
  80
  81 /* Align labels, etc. at 4-byte boundaries.
  82    For the 486, align to 16-byte boundary for sake of cache.  */
  83
  84 #undef ASM_OUTPUT_ALIGN_CODE
  85 #define ASM_OUTPUT_ALIGN_CODE(FILE)                     \
  86      fprintf ((FILE), "\t.align %d,0x90\n",             \
  87               TARGET_486 ? 4 : 2);  /* Use log of 16 or log of 4 as arg.  */
  88
  89 /* Align start of loop at 4-byte boundary.  */
  90
  91 #undef ASM_OUTPUT_LOOP_ALIGN
  92 #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
  93      fprintf ((FILE), "\t.align 2,0x90\n");  /* Use log of 4 as arg.  */
  94 \f
  95 #undef ASM_FILE_START
  96 #define ASM_FILE_START(FILE) \
  97   fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
  98
  99 /* A C statement or statements which output an assembler instruction
 100    opcode to the stdio stream STREAM.  The macro-operand PTR is a
 101    variable of type `char *' which points to the opcode name in its
 102    "internal" form--the form that is written in the machine description.
 103
 104    GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
 105    So use `repe' instead.  */
 106
 107 #define ASM_OUTPUT_OPCODE(STREAM, PTR)  \
 108 {                                                                       \
 109   if ((PTR)[0] == 'r'                                                   \
 110       && (PTR)[1] == 'e'                                                \
 111       && (PTR)[2] == 'p')                                               \
 112     {                                                                   \
 113       if ((PTR)[3] == 'z')                                              \
 114         {                                                               \
 115           fprintf (STREAM, "repe");                                     \
 116           (PTR) += 4;                                                   \
 117         }                                                               \
 118       else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')                      \
 119         {                                                               \
 120           fprintf (STREAM, "repne");                                    \
 121           (PTR) += 5;                                                   \
 122         }                                                               \
 123     }                                                                   \
 124 }
 125
 126 /* Define macro used to output shift-double opcodes when the shift
 127    count is in %cl.  Some assemblers require %cl as an argument;
 128    some don't.
 129
 130    GAS requires the %cl argument, so override unx386.h. */
 131
 132 #undef AS3_SHIFT_DOUBLE
 133 #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
 134
 135 /* Print opcodes the way that GAS expects them. */
 136 #define GAS_MNEMONICS 1