gcc/config/i386/sysv4.h

   1 /* Target definitions for GNU compiler for Intel 80386 running System V.4
   2    Copyright (C) 1991 Free Software Foundation, Inc.
   3
   4    Written by Ron Guilmette (rfg@netcom.com).
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 #include "i386/i386.h"  /* Base i386 target machine definitions */
  24 #include "i386/att.h"   /* Use the i386 AT&T assembler syntax */
  25 #include "svr4.h"       /* Definitions common to all SVR4 targets */
  26
  27 #undef TARGET_VERSION
  28 #define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
  29
  30 /* The svr4 ABI for the i386 says that records and unions are returned
  31    in memory.  */
  32
  33 #undef RETURN_IN_MEMORY
  34 #define RETURN_IN_MEMORY(TYPE) \
  35   (TYPE_MODE (TYPE) == BLKmode)
  36
  37 /* Define which macros to predefine.  __svr4__ is our extension.  */
  38 /* This used to define X86, but james@bigtex.cactus.org says that
  39    is supposed to be defined optionally by user programs--not by default.  */
  40 #define CPP_PREDEFINES \
  41   "-Dunix -D__svr4__ -Asystem(unix) -Asystem(svr4)"
  42
  43 /* This is how to output assembly code to define a `float' constant.
  44    We always have to use a .long pseudo-op to do this because the native
  45    SVR4 ELF assembler is buggy and it generates incorrect values when we
  46    try to use the .float pseudo-op instead.  */
  47
  48 #undef ASM_OUTPUT_FLOAT
  49 #define ASM_OUTPUT_FLOAT(FILE,VALUE)                                    \
  50 do { long value;                                                        \
  51      REAL_VALUE_TO_TARGET_SINGLE ((VALUE), value);                      \
  52      if (sizeof (int) == sizeof (long))                                 \
  53          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value);                \
  54      else                                                               \
  55          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value);               \
  56    } while (0)
  57
  58 /* This is how to output assembly code to define a `double' constant.
  59    We always have to use a pair of .long pseudo-ops to do this because
  60    the native SVR4 ELF assembler is buggy and it generates incorrect
  61    values when we try to use the .double pseudo-op instead.  */
  62
  63 #undef ASM_OUTPUT_DOUBLE
  64 #define ASM_OUTPUT_DOUBLE(FILE,VALUE)                                   \
  65 do { long value[2];                                                     \
  66      REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), value);                      \
  67      if (sizeof (int) == sizeof (long))                                 \
  68        {                                                                \
  69          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]);             \
  70          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]);             \
  71        }                                                                \
  72      else                                                               \
  73        {                                                                \
  74          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]);            \
  75          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]);            \
  76        }                                                                \
  77    } while (0)
  78
  79
  80 #undef ASM_OUTPUT_LONG_DOUBLE
  81 #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE)                              \
  82 do { long value[3];                                                     \
  83      REAL_VALUE_TO_TARGET_LONG_DOUBLE ((VALUE), value);                 \
  84      if (sizeof (int) == sizeof (long))                                 \
  85        {                                                                \
  86          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]);             \
  87          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]);             \
  88          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[2]);             \
  89        }                                                                \
  90      else                                                               \
  91        {                                                                \
  92          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]);            \
  93          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]);            \
  94          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[2]);            \
  95        }                                                                \
  96    } while (0)
  97
  98 /* Output at beginning of assembler file.  */
  99 /* The .file command should always begin the output.  */
 100
 101 #undef ASM_FILE_START
 102 #define ASM_FILE_START(FILE)                                            \
 103   do {                                                                  \
 104         output_file_directive (FILE, main_input_filename);              \
 105         fprintf (FILE, "\t.version\t\"01.01\"\n");                      \
 106   } while (0)
 107
 108 #undef DBX_REGISTER_NUMBER
 109 #define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]
 110
 111 /* The routine used to output sequences of byte values.  We use a special
 112    version of this for most svr4 targets because doing so makes the
 113    generated assembly code more compact (and thus faster to assemble)
 114    as well as more readable.  Note that if we find subparts of the
 115    character sequence which end with NUL (and which are shorter than
 116    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
 117
 118 #undef ASM_OUTPUT_ASCII
 119 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 120   do                                                                    \
 121     {                                                                   \
 122       register const unsigned char *_ascii_bytes =                      \
 123         (const unsigned char *) (STR);                                  \
 124       register const unsigned char *limit = _ascii_bytes + (LENGTH);    \
 125       register unsigned bytes_in_chunk = 0;                             \
 126       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
 127         {                                                               \
 128           register const unsigned char *p;                              \
 129           if (bytes_in_chunk >= 64)                                     \
 130             {                                                           \
 131               fputc ('\n', (FILE));                                     \
 132               bytes_in_chunk = 0;                                       \
 133             }                                                           \
 134           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
 135             continue;                                                   \
 136           if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT)          \
 137             {                                                           \
 138               if (bytes_in_chunk > 0)                                   \
 139                 {                                                       \
 140                   fputc ('\n', (FILE));                                 \
 141                   bytes_in_chunk = 0;                                   \
 142                 }                                                       \
 143               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
 144               _ascii_bytes = p;                                         \
 145             }                                                           \
 146           else                                                          \
 147             {                                                           \
 148               if (bytes_in_chunk == 0)                                  \
 149                 fprintf ((FILE), "\t.byte\t");                          \
 150               else                                                      \
 151                 fputc (',', (FILE));                                    \
 152               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
 153               bytes_in_chunk += 5;                                      \
 154             }                                                           \
 155         }                                                               \
 156       if (bytes_in_chunk > 0)                                           \
 157         fprintf ((FILE), "\n");                                         \
 158     }                                                                   \
 159   while (0)
 160
 161 /* This is how to output an element of a case-vector that is relative.
 162    This is only used for PIC code.  See comments by the `casesi' insn in
 163    i386.md for an explanation of the expression this outputs. */
 164
 165 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 166 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
 167   fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
 168
 169 /* Indicate that jump tables go in the text section.  This is
 170    necessary when compiling PIC code.  */
 171
 172 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
 173
 174 /* A C statement (sans semicolon) to output to the stdio stream
 175    FILE the assembler definition of uninitialized global DECL named
 176    NAME whose size is SIZE bytes and alignment is ALIGN bytes.
 177    Try to use asm_output_aligned_bss to implement this macro.  */
 178
 179 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 180   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)