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    || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
  37
  38 /* Define which macros to predefine.  __svr4__ is our extension.  */
  39 /* This used to define X86, but james@bigtex.cactus.org says that
  40    is supposed to be defined optionally by user programs--not by default.  */
  41 #define CPP_PREDEFINES \
  42   "-Dunix -D__svr4__ -Asystem=unix -Asystem=svr4"
  43
  44 /* This is how to output assembly code to define a `float' constant.
  45    We always have to use a .long pseudo-op to do this because the native
  46    SVR4 ELF assembler is buggy and it generates incorrect values when we
  47    try to use the .float pseudo-op instead.  */
  48
  49 #undef ASM_OUTPUT_FLOAT
  50 #define ASM_OUTPUT_FLOAT(FILE,VALUE)                                    \
  51 do { long value;                                                        \
  52      REAL_VALUE_TO_TARGET_SINGLE ((VALUE), value);                      \
  53      if (sizeof (int) == sizeof (long))                                 \
  54          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value);                \
  55      else                                                               \
  56          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value);               \
  57    } while (0)
  58
  59 /* This is how to output assembly code to define a `double' constant.
  60    We always have to use a pair of .long pseudo-ops to do this because
  61    the native SVR4 ELF assembler is buggy and it generates incorrect
  62    values when we try to use the .double pseudo-op instead.  */
  63
  64 #undef ASM_OUTPUT_DOUBLE
  65 #define ASM_OUTPUT_DOUBLE(FILE,VALUE)                                   \
  66 do { long value[2];                                                     \
  67      REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), value);                      \
  68      if (sizeof (int) == sizeof (long))                                 \
  69        {                                                                \
  70          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]);             \
  71          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]);             \
  72        }                                                                \
  73      else                                                               \
  74        {                                                                \
  75          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]);            \
  76          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]);            \
  77        }                                                                \
  78    } while (0)
  79
  80
  81 #undef ASM_OUTPUT_LONG_DOUBLE
  82 #define ASM_OUTPUT_LONG_DOUBLE(FILE,VALUE)                              \
  83 do { long value[3];                                                     \
  84      REAL_VALUE_TO_TARGET_LONG_DOUBLE ((VALUE), value);                 \
  85      if (sizeof (int) == sizeof (long))                                 \
  86        {                                                                \
  87          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[0]);             \
  88          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[1]);             \
  89          fprintf((FILE), "%s\t0x%x\n", ASM_LONG, value[2]);             \
  90        }                                                                \
  91      else                                                               \
  92        {                                                                \
  93          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[0]);            \
  94          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[1]);            \
  95          fprintf((FILE), "%s\t0x%lx\n", ASM_LONG, value[2]);            \
  96        }                                                                \
  97    } while (0)
  98
  99 /* Output at beginning of assembler file.  */
 100 /* The .file command should always begin the output.  */
 101
 102 #undef ASM_FILE_START
 103 #define ASM_FILE_START(FILE)                                            \
 104   do {                                                                  \
 105         output_file_directive (FILE, main_input_filename);              \
 106         fprintf (FILE, "\t.version\t\"01.01\"\n");                      \
 107   } while (0)
 108
 109 #undef DBX_REGISTER_NUMBER
 110 #define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]
 111
 112 /* The routine used to output sequences of byte values.  We use a special
 113    version of this for most svr4 targets because doing so makes the
 114    generated assembly code more compact (and thus faster to assemble)
 115    as well as more readable.  Note that if we find subparts of the
 116    character sequence which end with NUL (and which are shorter than
 117    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
 118
 119 #undef ASM_OUTPUT_ASCII
 120 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 121   do                                                                    \
 122     {                                                                   \
 123       register const unsigned char *_ascii_bytes =                      \
 124         (const unsigned char *) (STR);                                  \
 125       register const unsigned char *limit = _ascii_bytes + (LENGTH);    \
 126       register unsigned bytes_in_chunk = 0;                             \
 127       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
 128         {                                                               \
 129           register const unsigned char *p;                              \
 130           if (bytes_in_chunk >= 64)                                     \
 131             {                                                           \
 132               fputc ('\n', (FILE));                                     \
 133               bytes_in_chunk = 0;                                       \
 134             }                                                           \
 135           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
 136             continue;                                                   \
 137           if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT)          \
 138             {                                                           \
 139               if (bytes_in_chunk > 0)                                   \
 140                 {                                                       \
 141                   fputc ('\n', (FILE));                                 \
 142                   bytes_in_chunk = 0;                                   \
 143                 }                                                       \
 144               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
 145               _ascii_bytes = p;                                         \
 146             }                                                           \
 147           else                                                          \
 148             {                                                           \
 149               if (bytes_in_chunk == 0)                                  \
 150                 fprintf ((FILE), "\t.byte\t");                          \
 151               else                                                      \
 152                 fputc (',', (FILE));                                    \
 153               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
 154               bytes_in_chunk += 5;                                      \
 155             }                                                           \
 156         }                                                               \
 157       if (bytes_in_chunk > 0)                                           \
 158         fprintf ((FILE), "\n");                                         \
 159     }                                                                   \
 160   while (0)
 161
 162 /* This is how to output an element of a case-vector that is relative.
 163    This is only used for PIC code.  See comments by the `casesi' insn in
 164    i386.md for an explanation of the expression this outputs. */
 165
 166 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 167 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
 168   fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
 169
 170 /* Indicate that jump tables go in the text section.  This is
 171    necessary when compiling PIC code.  */
 172
 173 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
 174
 175 /* A C statement (sans semicolon) to output to the stdio stream
 176    FILE the assembler definition of uninitialized global DECL named
 177    NAME whose size is SIZE bytes and alignment is ALIGN bytes.
 178    Try to use asm_output_aligned_bss to implement this macro.  */
 179
 180 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 181   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)