gcc/config/rs6000/aix31.h

   1 /* Definitions of target machine for GNU compiler,
   2    for IBM RS/6000 running AIX version 3.1.
   3    Copyright (C) 1993,1997, 2000, 2001, 2003 Free Software Foundation, Inc.
   4    Contributed by Richard Kenner (kenner@nyu.edu)
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 2, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    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 COPYING.  If not, write to the
  20    Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  21    MA 02111-1307, USA.  */
  22
  23 /* Output something to declare an external symbol to the assembler.  Most
  24    assemblers don't need this.
  25
  26    If we haven't already, add "[RW]" (or "[DS]" for a function) to the
  27    name.  Normally we write this out along with the name.  In the few cases
  28    where we can't, it gets stripped off.  */
  29
  30 #undef ASM_OUTPUT_EXTERNAL
  31 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
  32 { rtx _symref = XEXP (DECL_RTL (DECL), 0);                              \
  33   if ((TREE_CODE (DECL) == VAR_DECL                                     \
  34        || TREE_CODE (DECL) == FUNCTION_DECL)                            \
  35       && (NAME)[strlen (NAME) - 1] != ']')                              \
  36     {                                                                   \
  37       XSTR (_symref, 0) = concat (XSTR (_symref, 0),                    \
  38                                   (TREE_CODE (DECL) == FUNCTION_DECL    \
  39                                    ? "[DS]" : "[RW]"),                  \
  40                                   NULL);                                \
  41     }                                                                   \
  42   fputs ("\t.extern ", FILE);                                           \
  43   assemble_name (FILE, XSTR (_symref, 0));                              \
  44   if (TREE_CODE (DECL) == FUNCTION_DECL)                                \
  45     {                                                                   \
  46       fputs ("\n\t.extern .", FILE);                                    \
  47       RS6000_OUTPUT_BASENAME (FILE, XSTR (_symref, 0));                 \
  48     }                                                                   \
  49   putc ('\n', FILE);                                                    \
  50 }
  51
  52 /* Similar, but for libcall.  We only have to worry about the function name,
  53    not that of the descriptor.  */
  54
  55 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)  \
  56 { fputs ("\t.extern .", FILE);                  \
  57   assemble_name (FILE, XSTR (FUN, 0));          \
  58   putc ('\n', FILE);                            \
  59 }
  60
  61 /* AIX 3.2 defined _AIX32, but older versions do not.  */
  62 #undef TARGET_OS_CPP_BUILTINS
  63 #define TARGET_OS_CPP_BUILTINS()         \
  64   do                                     \
  65     {                                    \
  66       builtin_define ("_IBMR2");         \
  67       builtin_define ("_AIX");           \
  68       builtin_assert ("system=unix");    \
  69       builtin_assert ("system=aix");     \
  70       builtin_assert ("cpu=rs6000");     \
  71       builtin_assert ("machine=rs6000"); \
  72     }                                    \
  73   while (0)
  74
  75 /* AIX 3.1 uses bit 15 in CROR as the magic nop.  */
  76 #undef RS6000_CALL_GLUE
  77 #define RS6000_CALL_GLUE "cror 15,15,15"
  78
  79 /* AIX 3.1 does not prepend underscores to itrunc, uitrunc, or mcount.  */
  80 #undef RS6000_ITRUNC
  81 #define RS6000_ITRUNC "itrunc"
  82 #undef RS6000_UITRUNC
  83 #define RS6000_UITRUNC "uitrunc"
  84 #undef RS6000_MCOUNT
  85 #define RS6000_MCOUNT ".mcount"
  86