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
  21 #include "i386.h"
  22 /* Use the bsd assembler syntax.  */
  23 /* we need to do this because gas is really a bsd style assembler,
  24  * and so doesn't work well this these att-isms:
  25  *
  26  *  ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
  27  *  ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
  28  *   used to define bss static space
  29  *
  30  * Next is the question of whether to uses underscores.  RMS didn't
  31  * like this idea at first, but since it is now obvious that we
  32  * need this separate tm file for use with gas, at least to get
  33  * dbx debugging info, I think we should also switch to underscores.
  34  * We can keep i386v for real att style output, and the few
  35  * people who want both form will have to compile twice.
  36  */
  37
  38 #include "bsd386.h"
  39
  40 /* these come from bsd386.h, but are specific to sequent */
  41 #undef DBX_NO_XREFS
  42 #undef DBX_CONTIN_LENGTH
  43
  44 /* By default, target has a 80387.  */
  45
  46 #define TARGET_DEFAULT 1
  47
  48 /* Specify predefined symbols in preprocessor.  */
  49
  50 #define CPP_PREDEFINES "-Dunix -Di386"
  51
  52 /* Allow #sccs in preprocessor.  */
  53
  54 #define SCCS_DIRECTIVE
  55
  56 /* Output #ident as a .ident.  */
  57
  58 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
  59
  60 /* We do not want to output SDB debugging information.  */
  61
  62 #undef SDB_DEBUGGING_INFO
  63
  64 /* We want to output DBX debugging information.  */
  65
  66 #define DBX_DEBUGGING_INFO
  67
  68 /* Implicit library calls should use memcpy, not bcopy, etc.  */
  69
  70 #define TARGET_MEM_FUNCTIONS
  71
  72 #if 0  /* People say gas uses the log as the arg to .align.  */
  73 /* When using gas, .align N aligns to an N-byte boundary.  */
  74
  75 #undef ASM_OUTPUT_ALIGN
  76 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
  77      if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
  78 #endif
  79
  80 /* Align labels, etc. at 4-byte boundaries.
  81    For the 486, align to 16-byte boundary for sake of cache.  */
  82
  83 #undef ASM_OUTPUT_ALIGN_CODE
  84 #define ASM_OUTPUT_ALIGN_CODE(FILE)                     \
  85      fprintf ((FILE), "\t.align %d,0x90\n",             \
  86               TARGET_486 ? 4 : 2);  /* Use log of 16 or log of 4 as arg.  */
  87
  88 /* Align start of loop at 4-byte boundary.  */
  89
  90 #undef ASM_OUTPUT_LOOP_ALIGN
  91 #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
  92      fprintf ((FILE), "\t.align 2,0x90\n");  /* Use log of 4 as arg.  */
  93 \f
  94 /* Machines that use the AT&T assembler syntax
  95    also return floating point values in an FP register.  */
  96 /* Define how to find the value returned by a function.
  97    VALTYPE is the data type of the value (as a tree).
  98    If the precise function being called is known, FUNC is its FUNCTION_DECL;
  99    otherwise, FUNC is 0.  */
 100
 101 #define VALUE_REGNO(MODE) \
 102   (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
 103
 104 /* 1 if N is a possible register number for a function value. */
 105
 106 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
 107
 108 #undef ASM_FILE_START
 109 #define ASM_FILE_START(FILE) \
 110   fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);