gcc/config/i386/i386elf.h

   1 /* Target definitions for GCC for Intel 80386 using ELF
   2    Copyright (C) 1988-2017 Free Software Foundation, Inc.
   3
   4    Derived from sysv4.h 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 /* The ELF ABI for the i386 says that records and unions are returned
  23    in memory.  */
  24
  25 #define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
  26         (TYPE_MODE (TYPE) == BLKmode \
  27          || (VECTOR_MODE_P (TYPE_MODE (TYPE)) && int_size_in_bytes (TYPE) == 8))
  28
  29 #undef CPP_SPEC
  30 #define CPP_SPEC ""
  31
  32 #define ENDFILE_SPEC "crtend.o%s"
  33
  34 #define STARTFILE_SPEC "%{!shared: \
  35                          %{!symbolic: \
  36                           %{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}}\
  37                         crtbegin.o%s"
  38
  39 #undef DBX_REGISTER_NUMBER
  40 #define DBX_REGISTER_NUMBER(n) \
  41   (TARGET_64BIT ? dbx64_register_map[n] : svr4_dbx_register_map[n])
  42
  43 /* The routine used to output sequences of byte values.  We use a special
  44    version of this for most svr4 targets because doing so makes the
  45    generated assembly code more compact (and thus faster to assemble)
  46    as well as more readable.  Note that if we find subparts of the
  47    character sequence which end with NUL (and which are shorter than
  48    ELF_STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
  49
  50 #undef ASM_OUTPUT_ASCII
  51 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
  52   do                                                                    \
  53     {                                                                   \
  54       const unsigned char *_ascii_bytes =                               \
  55         (const unsigned char *) (STR);                                  \
  56       const unsigned char *limit = _ascii_bytes + (LENGTH);             \
  57       unsigned bytes_in_chunk = 0;                                      \
  58       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
  59         {                                                               \
  60           const unsigned char *p;                                       \
  61           if (bytes_in_chunk >= 64)                                     \
  62             {                                                           \
  63               fputc ('\n', (FILE));                                     \
  64               bytes_in_chunk = 0;                                       \
  65             }                                                           \
  66           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
  67             continue;                                                   \
  68           if (p < limit && (p - _ascii_bytes) <= (long) ELF_STRING_LIMIT) \
  69             {                                                           \
  70               if (bytes_in_chunk > 0)                                   \
  71                 {                                                       \
  72                   fputc ('\n', (FILE));                                 \
  73                   bytes_in_chunk = 0;                                   \
  74                 }                                                       \
  75               ASM_OUTPUT_LIMITED_STRING ((FILE), (const char *) _ascii_bytes); \
  76               _ascii_bytes = p;                                         \
  77             }                                                           \
  78           else                                                          \
  79             {                                                           \
  80               if (bytes_in_chunk == 0)                                  \
  81                 fputs (ASM_BYTE, (FILE));                               \
  82               else                                                      \
  83                 fputc (',', (FILE));                                    \
  84               fprintf ((FILE), "0x%02x", *_ascii_bytes);                        \
  85               bytes_in_chunk += 5;                                      \
  86             }                                                           \
  87         }                                                               \
  88       if (bytes_in_chunk > 0)                                           \
  89         fputc ('\n', (FILE));                                           \
  90     }                                                                   \
  91   while (0)
  92
  93 #define LOCAL_LABEL_PREFIX      "."
  94
  95 /* Switch into a generic section.  */
  96 #define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
  97
  98 #undef BSS_SECTION_ASM_OP
  99 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
 100
 101 #undef ASM_OUTPUT_ALIGNED_BSS
 102 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 103   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)