gcc/config/rs6000/aix.h

   1 /* Definitions of target machine for GNU compiler,
   2    for IBM RS/6000 POWER running AIX.
   3    Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Yes!  We are AIX!  */
  23 #define DEFAULT_ABI ABI_AIX
  24 #undef TARGET_AIX
  25 #define TARGET_AIX 1
  26 /* The AIX linker will discard static constructors in object files before
  27    collect has a chance to see them, so scan the object files directly.  */
  28 #define COLLECT_EXPORT_LIST
  29
  30 /* Handle #pragma weak and #pragma pack.  */
  31 #define HANDLE_SYSV_PRAGMA
  32
  33 /* This is the only version of nm that collect2 can work with.  */
  34 #define REAL_NM_FILE_NAME "/usr/ucb/nm"
  35
  36 #define USER_LABEL_PREFIX  ""
  37 /* Don't turn -B into -L if the argument specifies a relative file name.  */
  38 #define RELATIVE_PREFIX_NOT_LINKDIR
  39
  40 /* Because of the above, we must have gcc search itself to find libgcc.a.  */
  41 #define LINK_LIBGCC_SPECIAL_1
  42
  43 /* Names to predefine in the preprocessor for this target machine.  */
  44 #define TARGET_OS_CPP_BUILTINS()         \
  45   do                                     \
  46     {                                    \
  47       builtin_define ("_IBMR2");         \
  48       builtin_define ("_POWER");         \
  49       builtin_define ("_AIX");           \
  50       builtin_define ("_AIX32");         \
  51       builtin_define ("_LONG_LONG");     \
  52       builtin_assert ("system=unix");    \
  53       builtin_assert ("system=aix");     \
  54       builtin_assert ("cpu=rs6000");     \
  55       builtin_assert ("machine=rs6000"); \
  56     }                                    \
  57   while (0)
  58
  59 /* Define appropriate architecture macros for preprocessor depending on
  60    target switches.  */
  61
  62 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\
  63    %{ansi: -D_ANSI_C_SOURCE}"
  64
  65 #undef ASM_DEFAULT_SPEC
  66 #define ASM_DEFAULT_SPEC ""
  67
  68 /* Tell the assembler to assume that all undefined names are external.
  69
  70    Don't do this until the fixed IBM assembler is more generally available.
  71    When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL,
  72    ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no
  73    longer be needed.  Also, the extern declaration of mcount in ASM_FILE_START
  74    will no longer be needed.  */
  75
  76 /* #define ASM_SPEC "-u %(asm_cpu)" */
  77
  78 /* Default location of syscalls.exp under AIX */
  79 #ifndef CROSS_COMPILE
  80 #define LINK_SYSCALLS_SPEC "-bI:/lib/syscalls.exp"
  81 #else
  82 #define LINK_SYSCALLS_SPEC ""
  83 #endif
  84
  85 /* Default location of libg.exp under AIX */
  86 #ifndef CROSS_COMPILE
  87 #define LINK_LIBG_SPEC "-bexport:/usr/lib/libg.exp"
  88 #else
  89 #define LINK_LIBG_SPEC ""
  90 #endif
  91
  92 /* Define the options for the binder: Start text at 512, align all segments
  93    to 512 bytes, and warn if there is text relocation.
  94
  95    The -bhalt:4 option supposedly changes the level at which ld will abort,
  96    but it also suppresses warnings about multiply defined symbols and is
  97    used by the AIX cc command.  So we use it here.
  98
  99    -bnodelcsect undoes a poor choice of default relating to multiply-defined
 100    csects.  See AIX documentation for more information about this.
 101
 102    -bM:SRE tells the linker that the output file is Shared REusable.  Note
 103    that to actually build a shared library you will also need to specify an
 104    export list with the -Wl,-bE option.  */
 105
 106 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\
 107 %{static:-bnso %(link_syscalls) } \
 108 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}"
 109
 110 /* Profiled library versions are used by linking with special directories.  */
 111 #define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\
 112 %{p:-L/lib/profiled -L/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc"
 113
 114 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 115 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 116   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 117               ? get_inner_array_type (FIELD) \
 118               : TREE_TYPE (FIELD)) == DFmode \
 119    ? MIN ((COMPUTED), 32) : (COMPUTED))
 120
 121 /* AIX increases natural record alignment to doubleword if the first
 122    field is an FP double while the FP fields remain word aligned.  */
 123 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
 124   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
 125     || TREE_CODE (STRUCT) == UNION_TYPE                 \
 126     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
 127    && TYPE_FIELDS (STRUCT) != 0                         \
 128    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
 129    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)            \
 130    : MAX ((COMPUTED), (SPECIFIED)))
 131
 132
 133
 134 /* Indicate that jump tables go in the text section.  */
 135
 136 #define JUMP_TABLES_IN_TEXT_SECTION 1
 137
 138 /* Enable AIX XL compiler calling convention breakage compatibility.  */
 139 #undef TARGET_XL_CALL
 140 #define MASK_XL_CALL            0x40000000
 141 #define TARGET_XL_CALL          (target_flags & MASK_XL_CALL)
 142 #undef  SUBTARGET_SWITCHES
 143 #define SUBTARGET_SWITCHES              \
 144   {"xl-call",           MASK_XL_CALL,                                   \
 145    N_("Always pass floating-point arguments in memory") },              \
 146   {"no-xl-call",        - MASK_XL_CALL,                                 \
 147    N_("Don't always pass floating-point arguments in memory") },        \
 148   SUBSUBTARGET_SWITCHES
 149 #define SUBSUBTARGET_SWITCHES
 150
 151 /* Define any extra SPECS that the compiler needs to generate.  */
 152 #undef  SUBTARGET_EXTRA_SPECS
 153 #define SUBTARGET_EXTRA_SPECS                                           \
 154   { "link_syscalls",            LINK_SYSCALLS_SPEC },                   \
 155   { "link_libg",                LINK_LIBG_SPEC }
 156
 157 /* Define cutoff for using external functions to save floating point.  */
 158 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63)
 159
 160 /* Optabs entries for the int->float routines and quad FP operations
 161    using the standard AIX names.  */
 162 #define ADDTF3_LIBCALL "_xlqadd"
 163 #define DIVTF3_LIBCALL "_xlqdiv"
 164 #define MULTF3_LIBCALL "_xlqmul"
 165 #define SUBTF3_LIBCALL "_xlqsub"
 166
 167 #define INIT_TARGET_OPTABS                                              \
 168   do {                                                                  \
 169     if (! TARGET_POWER2 && ! TARGET_POWERPC && TARGET_HARD_FLOAT)       \
 170       {                                                                 \
 171         fixdfsi_libfunc = init_one_libfunc (RS6000_ITRUNC);             \
 172         fixunsdfsi_libfunc = init_one_libfunc (RS6000_UITRUNC);         \
 173       }                                                                 \
 174     if (TARGET_HARD_FLOAT)                                              \
 175       {                                                                 \
 176         add_optab->handlers[(int) TFmode].libfunc                       \
 177           = init_one_libfunc (ADDTF3_LIBCALL);                          \
 178         sub_optab->handlers[(int) TFmode].libfunc                       \
 179           = init_one_libfunc (SUBTF3_LIBCALL);                          \
 180         smul_optab->handlers[(int) TFmode].libfunc                      \
 181           = init_one_libfunc (MULTF3_LIBCALL);                          \
 182         sdiv_optab->handlers[(int) TFmode].libfunc                      \
 183           = init_one_libfunc (DIVTF3_LIBCALL);                          \
 184       }                                                                 \
 185   } while (0)
 186
 187 /* AIX always has a TOC.  */
 188 #define TARGET_NO_TOC           0
 189 #define TARGET_TOC              1
 190
 191 #define FIXED_R2 1
 192 /* AIX allows r13 to be used.  */
 193 #define FIXED_R13 0
 194
 195 /* __throw will restore its own return address to be the same as the
 196    return address of the function that the throw is being made to.
 197    This is unfortunate, because we want to check the original
 198    return address to see if we need to restore the TOC.
 199    So we have to squirrel it away with this.  */
 200 #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()
 201
 202 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 203
 204 /* Print subsidiary information on the compiler version in use.  */
 205 #define TARGET_VERSION ;