gcc/config/i386/sysv4.h

   1 /* Target definitions for GCC for Intel 80386 running System V.4
   2    Copyright (C) 1991, 2001, 2002, 2007 Free Software Foundation, Inc.
   3
   4    Written by Ron Guilmette (rfg@netcom.com).
   5
   6 This file is part of GCC.
   7
   8 GCC 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 3, or (at your option)
  11 any later version.
  12
  13 GCC 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 GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22
  23 #define TARGET_VERSION fprintf (stderr, " (i386 System V Release 4)");
  24
  25 /* The svr4 ABI for the i386 says that records and unions are returned
  26    in memory.  */
  27
  28 #define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
  29         (TYPE_MODE (TYPE) == BLKmode \
  30          || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8));
  31
  32 /* Output at beginning of assembler file.  */
  33 /* The .file command should always begin the output.  */
  34
  35 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
  36 #undef X86_FILE_START_VERSION_DIRECTIVE
  37 #define X86_FILE_START_VERSION_DIRECTIVE true
  38
  39 #undef DBX_REGISTER_NUMBER
  40 #define DBX_REGISTER_NUMBER(n)  svr4_dbx_register_map[n]
  41
  42 /* The routine used to output sequences of byte values.  We use a special
  43    version of this for most svr4 targets because doing so makes the
  44    generated assembly code more compact (and thus faster to assemble)
  45    as well as more readable.  Note that if we find subparts of the
  46    character sequence which end with NUL (and which are shorter than
  47    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
  48
  49 #undef ASM_OUTPUT_ASCII
  50 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
  51   do                                                                    \
  52     {                                                                   \
  53       const unsigned char *_ascii_bytes =                               \
  54         (const unsigned char *) (STR);                                  \
  55       const unsigned char *limit = _ascii_bytes + (LENGTH);             \
  56       unsigned bytes_in_chunk = 0;                                      \
  57       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
  58         {                                                               \
  59           const unsigned char *p;                                       \
  60           if (bytes_in_chunk >= 64)                                     \
  61             {                                                           \
  62               fputc ('\n', (FILE));                                     \
  63               bytes_in_chunk = 0;                                       \
  64             }                                                           \
  65           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
  66             continue;                                                   \
  67           if (p < limit && (p - _ascii_bytes) <= (long) STRING_LIMIT)   \
  68             {                                                           \
  69               if (bytes_in_chunk > 0)                                   \
  70                 {                                                       \
  71                   fputc ('\n', (FILE));                                 \
  72                   bytes_in_chunk = 0;                                   \
  73                 }                                                       \
  74               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
  75               _ascii_bytes = p;                                         \
  76             }                                                           \
  77           else                                                          \
  78             {                                                           \
  79               if (bytes_in_chunk == 0)                                  \
  80                 fprintf ((FILE), "\t.byte\t");                          \
  81               else                                                      \
  82                 fputc (',', (FILE));                                    \
  83               fprintf ((FILE), "0x%02x", *_ascii_bytes);                \
  84               bytes_in_chunk += 5;                                      \
  85             }                                                           \
  86         }                                                               \
  87       if (bytes_in_chunk > 0)                                           \
  88         fprintf ((FILE), "\n");                                         \
  89     }                                                                   \
  90   while (0)
  91
  92 /* A C statement (sans semicolon) to output to the stdio stream
  93    FILE the assembler definition of uninitialized global DECL named
  94    NAME whose size is SIZE bytes and alignment is ALIGN bytes.
  95    Try to use asm_output_aligned_bss to implement this macro.  */
  96
  97 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
  98   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
  99
 100 /* Handle special EH pointer encodings.  Absolute, pc-relative, and
 101    indirect are handled automatically.  */
 102 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
 103   do {                                                                  \
 104     if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_datarel)         \
 105       {                                                                 \
 106         fputs (ASM_LONG, FILE);                                         \
 107         assemble_name (FILE, XSTR (ADDR, 0));                           \
 108         fputs (((ENCODING) & DW_EH_PE_indirect ? "@GOT" : "@GOTOFF"), FILE); \
 109         goto DONE;                                                      \
 110       }                                                                 \
 111   } while (0)
 112
 113 /* Used by crtstuff.c to initialize the base of data-relative relocations.
 114    These are GOT relative on x86, so return the pic register.  */
 115 #ifdef __PIC__
 116 #define CRT_GET_RFIB_DATA(BASE)                 \
 117   {                                             \
 118     register void *ebx_ __asm__("ebx");         \
 119     BASE = ebx_;                                \
 120   }
 121 #else
 122 #define CRT_GET_RFIB_DATA(BASE)                                         \
 123   __asm__ ("call\t.LPR%=\n"                                             \
 124            ".LPR%=:\n\t"                                                \
 125            "pop{l}\t%0\n\t"                                             \
 126            /* Due to a GAS bug, this cannot use EAX.  That encodes      \
 127               smaller than the traditional EBX, which results in the    \
 128               offset being off by one.  */                              \
 129            "add{l}\t{$_GLOBAL_OFFSET_TABLE_+[.-.LPR%=],%0"              \
 130                    "|%0,_GLOBAL_OFFSET_TABLE_+(.-.LPR%=)}"              \
 131            : "=d"(BASE))
 132 #endif