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, 2003, 2004, 2005, 2006, 2007, 2008, 2010,
   4    2011, 2012 Free Software Foundation, Inc.
   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 3, 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 COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 /* Yes!  We are AIX!  */
  23 #define DEFAULT_ABI ABI_AIX
  24 #undef  TARGET_AIX
  25 #define TARGET_AIX 1
  26
  27 /* Linux64.h wants to redefine TARGET_AIX based on -m64, but it can't be used
  28    in the #if conditional in options-default.h, so provide another macro.  */
  29 #undef  TARGET_AIX_OS
  30 #define TARGET_AIX_OS 1
  31
  32 /* AIX always has a TOC.  */
  33 #define TARGET_NO_TOC 0
  34 #define TARGET_TOC 1
  35 #define FIXED_R2 1
  36
  37 /* AIX allows r13 to be used in 32-bit mode.  */
  38 #define FIXED_R13 0
  39
  40 /* 32-bit and 64-bit AIX stack boundary is 128.  */
  41 #undef  STACK_BOUNDARY
  42 #define STACK_BOUNDARY 128
  43
  44 #undef  TARGET_IEEEQUAD
  45 #define TARGET_IEEEQUAD 0
  46
  47 /* The AIX linker will discard static constructors in object files before
  48    collect has a chance to see them, so scan the object files directly.  */
  49 #define COLLECT_EXPORT_LIST
  50
  51 #if HAVE_AS_REF
  52 /* Issue assembly directives that create a reference to the given DWARF table
  53    identifier label from the current function section.  This is defined to
  54    ensure we drag frame frame tables associated with needed function bodies in
  55    a link with garbage collection activated.  */
  56 #define ASM_OUTPUT_DWARF_TABLE_REF rs6000_aix_asm_output_dwarf_table_ref
  57 #endif
  58
  59 /* This is the only version of nm that collect2 can work with.  */
  60 #define REAL_NM_FILE_NAME "/usr/ucb/nm"
  61
  62 #define USER_LABEL_PREFIX  ""
  63
  64 /* Don't turn -B into -L if the argument specifies a relative file name.  */
  65 #define RELATIVE_PREFIX_NOT_LINKDIR
  66
  67 /* Because of the above, we must have gcc search itself to find libgcc.a.  */
  68 #define LINK_LIBGCC_SPECIAL_1
  69
  70 #define MFWRAP_SPEC " %{static: %{fmudflap|fmudflapth: \
  71  -brename:malloc,__wrap_malloc -brename:__real_malloc,malloc \
  72  -brename:free,__wrap_free -brename:__real_free,free \
  73  -brename:calloc,__wrap_calloc -brename:__real_calloc,calloc \
  74  -brename:realloc,__wrap_realloc -brename:__real_realloc,realloc \
  75  -brename:mmap,__wrap_mmap -brename:__real_mmap,mmap \
  76  -brename:munmap,__wrap_munmap -brename:__real_munmap,munmap \
  77  -brename:alloca,__wrap_alloca -brename:__real_alloca,alloca \
  78 } %{fmudflapth: \
  79  -brename:pthread_create,__wrap_pthread_create \
  80  -brename:__real_pthread_create,pthread_create \
  81  -brename:pthread_join,__wrap_pthread_join \
  82  -brename:__real_pthread_join,pthread_join \
  83  -brename:pthread_exit,__wrap_pthread_exit \
  84  -brename:__real_pthread_exit,pthread_exit \
  85 }} %{fmudflap|fmudflapth: \
  86  -brename:main,__wrap_main -brename:__real_main,main \
  87 }"
  88
  89 #define MFLIB_SPEC " %{fmudflap: -lmudflap \
  90  %{static:%(link_gcc_c_sequence) -lmudflap}} \
  91  %{fmudflapth: -lmudflapth -lpthread \
  92  %{static:%(link_gcc_c_sequence) -lmudflapth}} "
  93
  94 /* Names to predefine in the preprocessor for this target machine.  */
  95 #define TARGET_OS_AIX_CPP_BUILTINS()            \
  96   do                                            \
  97     {                                           \
  98       builtin_define ("_IBMR2");                \
  99       builtin_define ("_POWER");                \
 100       builtin_define ("__powerpc__");           \
 101       builtin_define ("__PPC__");               \
 102       builtin_define ("__unix__");              \
 103       builtin_define ("_AIX");                  \
 104       builtin_define ("_AIX32");                \
 105       builtin_define ("_AIX41");                \
 106       builtin_define ("_LONG_LONG");            \
 107       if (TARGET_LONG_DOUBLE_128)               \
 108         builtin_define ("__LONGDOUBLE128");     \
 109       builtin_assert ("system=unix");           \
 110       builtin_assert ("system=aix");            \
 111     }                                           \
 112   while (0)
 113
 114 /* Define appropriate architecture macros for preprocessor depending on
 115    target switches.  */
 116
 117 #define CPP_SPEC "%{posix: -D_POSIX_SOURCE}\
 118    %{ansi: -D_ANSI_C_SOURCE}"
 119
 120 #define CC1_SPEC "%(cc1_cpu)"
 121
 122 #undef ASM_DEFAULT_SPEC
 123 #define ASM_DEFAULT_SPEC ""
 124
 125 /* Tell the assembler to assume that all undefined names are external.
 126
 127    Don't do this until the fixed IBM assembler is more generally available.
 128    When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL,
 129    ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no
 130    longer be needed.  Also, the extern declaration of mcount in
 131    rs6000_xcoff_file_start will no longer be needed.  */
 132
 133 /* #define ASM_SPEC "-u %(asm_cpu)" */
 134
 135 /* Default location of syscalls.exp under AIX */
 136 #define LINK_SYSCALLS_SPEC "-bI:%R/lib/syscalls.exp"
 137
 138 /* Default location of libg.exp under AIX */
 139 #define LINK_LIBG_SPEC "-bexport:%R/usr/lib/libg.exp"
 140
 141 /* Define the options for the binder: Start text at 512, align all segments
 142    to 512 bytes, and warn if there is text relocation.
 143
 144    The -bhalt:4 option supposedly changes the level at which ld will abort,
 145    but it also suppresses warnings about multiply defined symbols and is
 146    used by the AIX cc command.  So we use it here.
 147
 148    -bnodelcsect undoes a poor choice of default relating to multiply-defined
 149    csects.  See AIX documentation for more information about this.
 150
 151    -bM:SRE tells the linker that the output file is Shared REusable.  Note
 152    that to actually build a shared library you will also need to specify an
 153    export list with the -Wl,-bE option.  */
 154
 155 #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\
 156 %{static:-bnso %(link_syscalls) } \
 157 %{!shared:%{g*: %(link_libg) }} %{shared:-bM:SRE}"
 158
 159 /* Profiled library versions are used by linking with special directories.  */
 160 #define LIB_SPEC "%{pg:-L%R/lib/profiled -L%R/usr/lib/profiled}\
 161 %{p:-L%R/lib/profiled -L%R/usr/lib/profiled} %{!shared:%{g*:-lg}} -lc"
 162
 163 /* Static linking with shared libstdc++ requires libsupc++ as well.  */
 164 #define LIBSTDCXX_STATIC "supc++"
 165
 166 /* This now supports a natural alignment mode.  */
 167 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 168 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 169   ((TARGET_ALIGN_NATURAL == 0                                           \
 170     && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)     \
 171    ? MIN ((COMPUTED), 32)                                               \
 172    : (COMPUTED))
 173
 174 /* AIX increases natural record alignment to doubleword if the first
 175    field is an FP double while the FP fields remain word aligned.  */
 176 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 177   ((TREE_CODE (STRUCT) == RECORD_TYPE                                   \
 178     || TREE_CODE (STRUCT) == UNION_TYPE                                 \
 179     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                           \
 180    && TARGET_ALIGN_NATURAL == 0                                         \
 181    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 182    : MAX ((COMPUTED), (SPECIFIED)))
 183
 184 /* The AIX ABI isn't explicit on whether aggregates smaller than a
 185    word/doubleword should be padded upward or downward.  One could
 186    reasonably assume that they follow the normal rules for structure
 187    layout treating the parameter area as any other block of memory,
 188    then map the reg param area to registers, i.e., pad upward, which
 189    is the way IBM Compilers for AIX behave.
 190    Setting both of the following defines results in this behavior.  */
 191 #define AGGREGATE_PADDING_FIXED 1
 192 #define AGGREGATES_PAD_UPWARD_ALWAYS 1
 193
 194 /* Specify padding for the last element of a block move between
 195    registers and memory.  FIRST is nonzero if this is the only
 196    element.  */
 197 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 198   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 199
 200 /* Indicate that jump tables go in the text section.  */
 201
 202 #define JUMP_TABLES_IN_TEXT_SECTION 1
 203
 204 /* Define any extra SPECS that the compiler needs to generate.  */
 205 #undef  SUBTARGET_EXTRA_SPECS
 206 #define SUBTARGET_EXTRA_SPECS                                           \
 207   { "link_syscalls",            LINK_SYSCALLS_SPEC },                   \
 208   { "link_libg",                LINK_LIBG_SPEC }
 209
 210 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 211
 212 /* No version of AIX fully supports AltiVec or 64-bit instructions in
 213    32-bit mode.  */
 214 #define OS_MISSING_POWERPC64 1
 215 #define OS_MISSING_ALTIVEC 1
 216
 217 /* WINT_TYPE */
 218 #define WINT_TYPE "int"
 219
 220 /* Static stack checking is supported by means of probes.  */
 221 #define STACK_CHECK_STATIC_BUILTIN 1