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
  27 /* AIX always has a TOC.  */
  28 #define TARGET_NO_TOC 0
  29 #define TARGET_TOC 1
  30 #define FIXED_R2 1
  31
  32 /* AIX allows r13 to be used in 32-bit mode.  */
  33 #define FIXED_R13 0
  34
  35 /* AIX does not support Altivec.  */
  36 #undef  TARGET_ALTIVEC
  37 #define TARGET_ALTIVEC 0
  38 #undef  TARGET_ALTIVEC_ABI
  39 #define TARGET_ALTIVEC_ABI 0
  40 #undef  TARGET_ALTIVEC_VRSAVE
  41 #define TARGET_ALTIVEC_VRSAVE 0
  42
  43 /* The AIX linker will discard static constructors in object files before
  44    collect has a chance to see them, so scan the object files directly.  */
  45 #define COLLECT_EXPORT_LIST
  46
  47 /* Handle #pragma weak and #pragma pack.  */
  48 #define HANDLE_SYSV_PRAGMA
  49
  50 /* This is the only version of nm that collect2 can work with.  */
  51 #define REAL_NM_FILE_NAME "/usr/ucb/nm"
  52
  53 #define USER_LABEL_PREFIX  ""
  54 /* Don't turn -B into -L if the argument specifies a relative file name.  */
  55 #define RELATIVE_PREFIX_NOT_LINKDIR
  56
  57 /* Because of the above, we must have gcc search itself to find libgcc.a.  */
  58 #define LINK_LIBGCC_SPECIAL_1
  59
  60 /* Names to predefine in the preprocessor for this target machine.  */
  61 #define TARGET_OS_CPP_BUILTINS()         \
  62   do                                     \
  63     {                                    \
  64       builtin_define ("_IBMR2");         \
  65       builtin_define ("_POWER");         \
  66       builtin_define ("_AIX");           \
  67       builtin_define ("_AIX32");         \
  68       builtin_define ("_LONG_LONG");     \
  69       builtin_assert ("system=unix");    \
  70       builtin_assert ("system=aix");     \
  71       builtin_assert ("cpu=rs6000");     \
  72       builtin_assert ("machine=rs6000"); \
  73     }                                    \
  74   while (0)
  75
  76 /* Define appropriate architecture macros for preprocessor depending on
  77    target switches.  */
  78
  79 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\
  80    %{ansi: -D_ANSI_C_SOURCE}"
  81
  82 #undef ASM_DEFAULT_SPEC
  83 #define ASM_DEFAULT_SPEC ""
  84
  85 /* Tell the assembler to assume that all undefined names are external.
  86
  87    Don't do this until the fixed IBM assembler is more generally available.
  88    When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL,
  89    ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no
  90    longer be needed.  Also, the extern declaration of mcount in ASM_FILE_START
  91    will no longer be needed.  */
  92
  93 /* #define ASM_SPEC "-u %(asm_cpu)" */
  94
  95 /* Default location of syscalls.exp under AIX */
  96 #ifndef CROSS_COMPILE
  97 #define LINK_SYSCALLS_SPEC "-bI:/lib/syscalls.exp"
  98 #else
  99 #define LINK_SYSCALLS_SPEC ""
 100 #endif
 101
 102 /* Default location of libg.exp under AIX */
 103 #ifndef CROSS_COMPILE
 104 #define LINK_LIBG_SPEC "-bexport:/usr/lib/libg.exp"
 105 #else
 106 #define LINK_LIBG_SPEC ""
 107 #endif
 108
 109 /* Define the options for the binder: Start text at 512, align all segments
 110    to 512 bytes, and warn if there is text relocation.
 111
 112    The -bhalt:4 option supposedly changes the level at which ld will abort,
 113    but it also suppresses warnings about multiply defined symbols and is
 114    used by the AIX cc command.  So we use it here.
 115
 116    -bnodelcsect undoes a poor choice of default relating to multiply-defined
 117    csects.  See AIX documentation for more information about this.
 118
 119    -bM:SRE tells the linker that the output file is Shared REusable.  Note
 120    that to actually build a shared library you will also need to specify an
 121    export list with the -Wl,-bE option.  */
 122
 123 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\
 124 %{static:-bnso %(link_syscalls) } \
 125 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}"
 126
 127 /* Profiled library versions are used by linking with special directories.  */
 128 #define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\
 129 %{p:-L/lib/profiled -L/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc"
 130
 131 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 132 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 133   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 134               ? get_inner_array_type (FIELD) \
 135               : TREE_TYPE (FIELD)) == DFmode \
 136    ? MIN ((COMPUTED), 32) : (COMPUTED))
 137
 138 /* AIX increases natural record alignment to doubleword if the first
 139    field is an FP double while the FP fields remain word aligned.  */
 140 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
 141   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
 142     || TREE_CODE (STRUCT) == UNION_TYPE                 \
 143     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
 144    && TYPE_FIELDS (STRUCT) != 0                         \
 145    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
 146    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)            \
 147    : MAX ((COMPUTED), (SPECIFIED)))
 148
 149 /* Indicate that jump tables go in the text section.  */
 150
 151 #define JUMP_TABLES_IN_TEXT_SECTION 1
 152
 153 /* Enable AIX XL compiler calling convention breakage compatibility.  */
 154 #undef TARGET_XL_CALL
 155 #define MASK_XL_CALL            0x40000000
 156 #define TARGET_XL_CALL          (target_flags & MASK_XL_CALL)
 157 #undef  SUBTARGET_SWITCHES
 158 #define SUBTARGET_SWITCHES              \
 159   {"xl-call",           MASK_XL_CALL,                                   \
 160    N_("Always pass floating-point arguments in memory") },              \
 161   {"no-xl-call",        - MASK_XL_CALL,                                 \
 162    N_("Don't always pass floating-point arguments in memory") },        \
 163   SUBSUBTARGET_SWITCHES
 164 #define SUBSUBTARGET_SWITCHES
 165
 166 /* Define any extra SPECS that the compiler needs to generate.  */
 167 #undef  SUBTARGET_EXTRA_SPECS
 168 #define SUBTARGET_EXTRA_SPECS                                           \
 169   { "link_syscalls",            LINK_SYSCALLS_SPEC },                   \
 170   { "link_libg",                LINK_LIBG_SPEC }
 171
 172 /* Define cutoff for using external functions to save floating point.  */
 173 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63)
 174
 175 /* Optabs entries for the int->float routines and quad FP operations
 176    using the standard AIX names.  */
 177 #define ADDTF3_LIBCALL "_xlqadd"
 178 #define DIVTF3_LIBCALL "_xlqdiv"
 179 #define MULTF3_LIBCALL "_xlqmul"
 180 #define SUBTF3_LIBCALL "_xlqsub"
 181
 182 #define INIT_TARGET_OPTABS                                              \
 183   do {                                                                  \
 184     if (! TARGET_POWER2 && ! TARGET_POWERPC && TARGET_HARD_FLOAT)       \
 185       {                                                                 \
 186         fixdfsi_libfunc = init_one_libfunc (RS6000_ITRUNC);             \
 187         fixunsdfsi_libfunc = init_one_libfunc (RS6000_UITRUNC);         \
 188       }                                                                 \
 189     if (TARGET_HARD_FLOAT)                                              \
 190       {                                                                 \
 191         add_optab->handlers[(int) TFmode].libfunc                       \
 192           = init_one_libfunc (ADDTF3_LIBCALL);                          \
 193         sub_optab->handlers[(int) TFmode].libfunc                       \
 194           = init_one_libfunc (SUBTF3_LIBCALL);                          \
 195         smul_optab->handlers[(int) TFmode].libfunc                      \
 196           = init_one_libfunc (MULTF3_LIBCALL);                          \
 197         sdiv_optab->handlers[(int) TFmode].libfunc                      \
 198           = init_one_libfunc (DIVTF3_LIBCALL);                          \
 199       }                                                                 \
 200   } while (0)
 201
 202 /* __throw will restore its own return address to be the same as the
 203    return address of the function that the throw is being made to.
 204    This is unfortunate, because we want to check the original
 205    return address to see if we need to restore the TOC.
 206    So we have to squirrel it away with this.  */
 207 #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()
 208
 209 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 210
 211 /* Print subsidiary information on the compiler version in use.  */
 212 #define TARGET_VERSION ;