gcc/config/i386/lynx.h

   1 /* Definitions for LynxOS on i386.
   2    Copyright (C) 1993-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #define TARGET_OS_CPP_BUILTINS()                \
  21   do                                            \
  22     {                                           \
  23       builtin_define ("__LITTLE_ENDIAN__");     \
  24       builtin_define ("__x86__");               \
  25     }                                           \
  26   while (0)
  27
  28 /* The svr4 ABI for the i386 says that records and unions are returned
  29    in memory.  */
  30
  31 #define DEFAULT_PCC_STRUCT_RETURN 1
  32
  33 /* BSS_SECTION_ASM_OP gets defined i386/unix.h.  */
  34
  35 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
  36   asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
  37
  38 /* LynxOS's GDB counts the floating point registers from 16.  */
  39
  40 #undef DBX_REGISTER_NUMBER
  41 #define DBX_REGISTER_NUMBER(n)                                          \
  42   (TARGET_64BIT ? dbx64_register_map[n]                                 \
  43    : (n) == 0 ? 0                                                       \
  44    : (n) == 1 ? 2                                                       \
  45    : (n) == 2 ? 1                                                       \
  46    : (n) == 3 ? 3                                                       \
  47    : (n) == 4 ? 6                                                       \
  48    : (n) == 5 ? 7                                                       \
  49    : (n) == 6 ? 5                                                       \
  50    : (n) == 7 ? 4                                                       \
  51    : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (int) (n) + 8  \
  52    : (-1))
  53
  54 /* A C statement to output to the stdio stream FILE an assembler
  55    command to advance the location counter to a multiple of 1<<LOG
  56    bytes if it is within MAX_SKIP bytes.
  57
  58    This is used to align code labels according to Intel recommendations.  */
  59
  60 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
  61 #define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP)                    \
  62   do {                                                                  \
  63     if ((LOG) != 0) {                                                   \
  64       if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG));  \
  65       else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP));  \
  66     }                                                                   \
  67   } while (0)
  68 #endif
  69
  70 /* Undefine SUBTARGET_EXTRA_SPECS it is empty anyway.  We define it in
  71    config/lynx.h.  */
  72
  73 #undef SUBTARGET_EXTRA_SPECS
  74
  75 /* Undefine the definition from att.h to enable our default.  */
  76
  77 #undef ASM_OUTPUT_ALIGN
  78
  79 /* Undefine the definition from elfos.h to enable our default.  */
  80
  81 #undef PREFERRED_DEBUGGING_TYPE
  82
  83 /* The file i386.c defines TARGET_HAVE_TLS unconditionally if
  84    HAVE_AS_TLS is defined.  HAVE_AS_TLS is defined as gas support for
  85    TLS is detected by configure.  We undefine it here.  */
  86
  87 #undef HAVE_AS_TLS
  88
  89 #define IX86_MAYBE_NO_LIBGCC_TFMODE