gcc/config/i386/sysv4.h

   1 /* Target definitions for GNU compiler for Intel 80386 running System V.4
   2    Copyright (C) 1991, 2001, 2002 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
  24 #define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
  25
  26 /* The svr4 ABI for the i386 says that records and unions are returned
  27    in memory.  */
  28
  29 #undef RETURN_IN_MEMORY
  30 #define RETURN_IN_MEMORY(TYPE) \
  31   (TYPE_MODE (TYPE) == BLKmode \
  32    || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
  33
  34 /* Output at beginning of assembler file.  */
  35 /* The .file command should always begin the output.  */
  36
  37 #undef ASM_FILE_START
  38 #define ASM_FILE_START(FILE)                                            \
  39   do {                                                                  \
  40         output_file_directive (FILE, main_input_filename);              \
  41         fprintf (FILE, "\t.version\t\"01.01\"\n");                      \
  42   } while (0)
  43
  44 #undef DBX_REGISTER_NUMBER
  45 #define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]
  46
  47 /* The routine used to output sequences of byte values.  We use a special
  48    version of this for most svr4 targets because doing so makes the
  49    generated assembly code more compact (and thus faster to assemble)
  50    as well as more readable.  Note that if we find subparts of the
  51    character sequence which end with NUL (and which are shorter than
  52    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
  53
  54 #undef ASM_OUTPUT_ASCII
  55 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
  56   do                                                                    \
  57     {                                                                   \
  58       register const unsigned char *_ascii_bytes =                      \
  59         (const unsigned char *) (STR);                                  \
  60       register const unsigned char *limit = _ascii_bytes + (LENGTH);    \
  61       register unsigned bytes_in_chunk = 0;                             \
  62       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
  63         {                                                               \
  64           register const unsigned char *p;                              \
  65           if (bytes_in_chunk >= 64)                                     \
  66             {                                                           \
  67               fputc ('\n', (FILE));                                     \
  68               bytes_in_chunk = 0;                                       \
  69             }                                                           \
  70           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
  71             continue;                                                   \
  72           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
  73             {                                                           \
  74               if (bytes_in_chunk > 0)                                   \
  75                 {                                                       \
  76                   fputc ('\n', (FILE));                                 \
  77                   bytes_in_chunk = 0;                                   \
  78                 }                                                       \
  79               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
  80               _ascii_bytes = p;                                         \
  81             }                                                           \
  82           else                                                          \
  83             {                                                           \
  84               if (bytes_in_chunk == 0)                                  \
  85                 fprintf ((FILE), "\t.byte\t");                          \
  86               else                                                      \
  87                 fputc (',', (FILE));                                    \
  88               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
  89               bytes_in_chunk += 5;                                      \
  90             }                                                           \
  91         }                                                               \
  92       if (bytes_in_chunk > 0)                                           \
  93         fprintf ((FILE), "\n");                                         \
  94     }                                                                   \
  95   while (0)
  96
  97 /* A C statement (sans semicolon) to output to the stdio stream
  98    FILE the assembler definition of uninitialized global DECL named
  99    NAME whose size is SIZE bytes and alignment is ALIGN bytes.
 100    Try to use asm_output_aligned_bss to implement this macro.  */
 101
 102 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 103   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
 104
 105 /* Handle special EH pointer encodings.  Absolute, pc-relative, and
 106    indirect are handled automatically.  */
 107 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
 108   do {                                                                  \
 109     if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)         \
 110       {                                                                 \
 111         fputs (ASM_LONG, FILE);                                         \
 112         assemble_name (FILE, XSTR (ADDR, 0));                           \
 113         fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
 114         goto DONE;                                                      \
 115       }                                                                 \
 116   } while (0)
 117
 118 /* Used by crtstuff.c to initialize the base of data-relative relocations.
 119    These are GOT relative on x86, so return the pic register.  */
 120 #ifdef __PIC__
 121 #define CRT_GET_RFIB_DATA(BASE)                 \
 122   {                                             \
 123     register void *ebx_ __asm__("ebx");         \
 124     BASE = ebx_;                                \
 125   }
 126 #else
 127 #define CRT_GET_RFIB_DATA(BASE)                                         \
 128   __asm__ ("call\t.LPR%=\n"                                             \
 129            ".LPR%=:\n\t"                                                \
 130            "popl\t%0\n\t"                                               \
 131            /* Due to a GAS bug, this cannot use EAX.  That encodes      \
 132               smaller than the traditional EBX, which results in the    \
 133               offset being off by one.  */                              \
 134            "addl\t$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0"                 \
 135            : "=d"(BASE))
 136 #endif