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 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 /* This is the only version of nm that collect2 can work with.  */
  31 #define REAL_NM_FILE_NAME "/usr/ucb/nm"
  32
  33 /* AIX does not have any init/fini or ctor/dtor sections, so create
  34     static constructors and destructors as normal functions.  */
  35 /* #define ASM_OUTPUT_CONSTRUCTOR(file, name) */
  36 /* #define ASM_OUTPUT_DESTRUCTOR(file, name) */
  37 #define USER_LABEL_PREFIX  ""
  38 /* Don't turn -B into -L if the argument specifies a relative file name.  */
  39 #define RELATIVE_PREFIX_NOT_LINKDIR
  40
  41 /* Because of the above, we must have gcc search itself to find libgcc.a.  */
  42 #define LINK_LIBGCC_SPECIAL_1
  43
  44 /* Names to predefine in the preprocessor for this target machine.  */
  45 #define CPP_PREDEFINES "-D_IBMR2 -D_POWER -D_AIX -D_AIX32 -D_LONG_LONG \
  46 -Asystem=unix -Asystem=aix -Acpu=rs6000 -Amachine=rs6000"
  47
  48 /* Define appropriate architecture macros for preprocessor depending on
  49    target switches.  */
  50
  51 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\
  52    %{ansi: -D_ANSI_C_SOURCE}\
  53    %(cpp_cpu)"
  54
  55 #undef CPP_DEFAULT_SPEC
  56 #define CPP_DEFAULT_SPEC "-D_ARCH_PWR"
  57
  58 #undef ASM_DEFAULT_SPEC
  59 #define ASM_DEFAULT_SPEC ""
  60
  61 /* Tell the assembler to assume that all undefined names are external.
  62
  63    Don't do this until the fixed IBM assembler is more generally available.
  64    When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL,
  65    ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no
  66    longer be needed.  Also, the extern declaration of mcount in ASM_FILE_START
  67    will no longer be needed.  */
  68
  69 /* #define ASM_SPEC "-u %(asm_cpu)" */
  70
  71 /* Default location of syscalls.exp under AIX */
  72 #ifndef CROSS_COMPILE
  73 #define LINK_SYSCALLS_SPEC "-bI:/lib/syscalls.exp"
  74 #else
  75 #define LINK_SYSCALLS_SPEC ""
  76 #endif
  77
  78 /* Default location of libg.exp under AIX */
  79 #ifndef CROSS_COMPILE
  80 #define LINK_LIBG_SPEC "-bexport:/usr/lib/libg.exp"
  81 #else
  82 #define LINK_LIBG_SPEC ""
  83 #endif
  84
  85 /* Define the options for the binder: Start text at 512, align all segments
  86    to 512 bytes, and warn if there is text relocation.
  87
  88    The -bhalt:4 option supposedly changes the level at which ld will abort,
  89    but it also suppresses warnings about multiply defined symbols and is
  90    used by the AIX cc command.  So we use it here.
  91
  92    -bnodelcsect undoes a poor choice of default relating to multiply-defined
  93    csects.  See AIX documentation for more information about this.
  94
  95    -bM:SRE tells the linker that the output file is Shared REusable.  Note
  96    that to actually build a shared library you will also need to specify an
  97    export list with the -Wl,-bE option.  */
  98
  99 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\
 100 %{static:-bnso %(link_syscalls) } \
 101 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}"
 102
 103 /* Profiled library versions are used by linking with special directories.  */
 104 #define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\
 105 %{p:-L/lib/profiled -L/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc"
 106
 107 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 108 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 109   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 110               ? get_inner_array_type (FIELD) \
 111               : TREE_TYPE (FIELD)) == DFmode \
 112    ? MIN ((COMPUTED), 32) : (COMPUTED))
 113
 114 /* AIX increases natural record alignment to doubleword if the first
 115    field is an FP double while the FP fields remain word aligned.  */
 116 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
 117   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
 118     || TREE_CODE (STRUCT) == UNION_TYPE                 \
 119     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
 120    && TYPE_FIELDS (STRUCT) != 0                         \
 121    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
 122    ? MAX (MAX ((COMPUTED), (SPECIFIED)), BIGGEST_ALIGNMENT) \
 123    : MAX ((COMPUTED), (SPECIFIED)))
 124
 125
 126
 127 /* Indicate that jump tables go in the text section.  */
 128
 129 #define JUMP_TABLES_IN_TEXT_SECTION 1
 130
 131 /* Enable AIX XL compiler calling convention breakage compatibility.  */
 132 #undef TARGET_XL_CALL
 133 #define MASK_XL_CALL            0x40000000
 134 #define TARGET_XL_CALL          (target_flags & MASK_XL_CALL)
 135 #undef  SUBTARGET_SWITCHES
 136 #define SUBTARGET_SWITCHES              \
 137   {"xl-call",           MASK_XL_CALL,                                   \
 138    N_("Always pass floating-point arguments in memory") },              \
 139   {"no-xl-call",        - MASK_XL_CALL,                                 \
 140    N_("Don't always pass floating-point arguments in memory") },        \
 141   SUBSUBTARGET_SWITCHES
 142 #define SUBSUBTARGET_SWITCHES
 143
 144 /* Define any extra SPECS that the compiler needs to generate.  */
 145 #undef  SUBTARGET_EXTRA_SPECS
 146 #define SUBTARGET_EXTRA_SPECS                                           \
 147   { "link_syscalls",            LINK_SYSCALLS_SPEC },                   \
 148   { "link_libg",                LINK_LIBG_SPEC }
 149
 150 /* Define cutoff for using external functions to save floating point.  */
 151 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63)
 152
 153 /* Optabs entries for the int->float routines, using the standard
 154    AIX names.  */
 155 #define INIT_TARGET_OPTABS                                              \
 156   do {                                                                  \
 157     if (! TARGET_POWER2 && ! TARGET_POWERPC && TARGET_HARD_FLOAT)       \
 158       {                                                                 \
 159         fixdfsi_libfunc = init_one_libfunc (RS6000_ITRUNC);             \
 160         fixunsdfsi_libfunc = init_one_libfunc (RS6000_UITRUNC);         \
 161       }                                                                 \
 162   } while (0)
 163
 164 /* AIX always has a TOC.  */
 165 #define TARGET_NO_TOC           0
 166 #define TARGET_TOC              1
 167
 168 /* AIX allows r13 to be used.  */
 169 #define FIXED_R13 0
 170
 171 /* __throw will restore its own return address to be the same as the
 172    return address of the function that the throw is being made to.
 173    This is unfortunate, because we want to check the original
 174    return address to see if we need to restore the TOC.
 175    So we have to squirrel it away with this.  */
 176 #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()
 177
 178 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)