gcc/config/pa/pa64-hpux.h

   1 /* Definitions of target machine for GNU compiler, for HPs running
   2    HPUX using the 64bit runtime model.
   3    Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005 Free Software Foundation,
   4    Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public 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
  20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  21 Boston, MA 02110-1301, USA.  */
  22
  23 /* We can debug dynamically linked executables on hpux11; we also
  24    want dereferencing of a NULL pointer to cause a SEGV.  Do not move
  25    the "+Accept TypeMismatch" switch.  We check for it in collect2
  26    to determine which init/fini is needed.  */
  27 #undef LINK_SPEC
  28 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
  29 #define LINK_SPEC \
  30   "%{!shared:%{p:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  31      %nWarning: consider linking with `-static' as system libraries with\n\
  32      %n  profiling support are only provided in archive format}}}\
  33    %{!shared:%{pg:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  34      %nWarning: consider linking with `-static' as system libraries with\n\
  35      %n  profiling support are only provided in archive format}}}\
  36    %{mhp-ld:+Accept TypeMismatch -z} -E %{mlinker-opt:-O} %{!shared:-u main}\
  37    %{static:-a archive} %{shared:%{mhp-ld:-b}%{!mhp-ld:-shared}}"
  38 #else
  39 #define LINK_SPEC \
  40   "%{!shared:%{p:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  41      %nWarning: consider linking with `-static' as system libraries with\n\
  42      %n  profiling support are only provided in archive format}}}\
  43    %{!shared:%{pg:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  44      %nWarning: consider linking with `-static' as system libraries with\n\
  45      %n  profiling support are only provided in archive format}}}\
  46    %{!mgnu-ld:+Accept TypeMismatch -z} -E %{mlinker-opt:-O} %{!shared:-u main}\
  47    %{static:-a archive} %{shared:%{mgnu-ld:-shared}%{!mgnu-ld:-b}}"
  48 #endif
  49
  50 /* Profiling support is only provided in libc.a.  However, libprof and
  51    libgprof are only available in shared form on HP-UX 11.00.  We use
  52    the shared form if we are using the GNU linker or an archive form
  53    isn't available.  We also usually need to link with libdld and it's
  54    only available in shared form.  */
  55 #undef LIB_SPEC
  56 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
  57 #define LIB_SPEC \
  58   "%{!shared:\
  59      %{!p:%{!pg: %{static:-lpthread} -lc\
  60             %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  61      %{p:%{!pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
  62            -lprof %{static:-a archive -lpthread} -lc\
  63            %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  64      %{pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
  65        -lgprof %{static:-a archive -lpthread} -lc\
  66        %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  67    /usr/lib/pa20_64/milli.a"
  68 #else
  69 #define LIB_SPEC \
  70   "%{!shared:\
  71      %{!p:%{!pg: %{static:-lpthread} -lc\
  72             %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  73      %{p:%{!pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
  74            -lprof %{static:-a archive -lpthread} -lc\
  75            %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  76      %{pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
  77        -lgprof %{static:-a archive -lpthread} -lc\
  78        %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  79    /usr/lib/pa20_64/milli.a"
  80 #endif
  81
  82 /* Under hpux11, the normal location of the `ld' and `as' programs is the
  83    /usr/ccs/bin directory.  */
  84
  85 #ifndef CROSS_COMPILE
  86 #undef MD_EXEC_PREFIX
  87 #define MD_EXEC_PREFIX "/usr/ccs/bin"
  88 #endif
  89
  90 /* Default prefixes.  */
  91
  92 #undef STANDARD_STARTFILE_PREFIX_1
  93 #define STANDARD_STARTFILE_PREFIX_1 "/lib/pa20_64/"
  94
  95 #undef STANDARD_STARTFILE_PREFIX_2
  96 #define STANDARD_STARTFILE_PREFIX_2 "/usr/lib/pa20_64/"
  97
  98 /* Under hpux11 the normal location of the various pa20_64 *crt*.o files
  99    is the /usr/ccs/lib/pa20_64 directory.  Some files may also be in the
 100    /opt/langtools/lib/pa20_64 directory.  */
 101
 102 #ifndef CROSS_COMPILE
 103 #undef MD_STARTFILE_PREFIX
 104 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/pa20_64/"
 105 #endif
 106
 107 #ifndef CROSS_COMPILE
 108 #undef MD_STARTFILE_PREFIX_1
 109 #define MD_STARTFILE_PREFIX_1 "/opt/langtools/lib/pa20_64/"
 110 #endif
 111
 112 /* This macro specifies the biggest alignment supported by the object
 113    file format of this machine.
 114
 115    The .align directive in the HP assembler allows alignments up to
 116    4096 bytes.  However, the maximum alignment of a global common symbol
 117    is 16 bytes using HP ld.  Unfortunately, this macro doesn't provide
 118    a method to check for common symbols.  */
 119 #undef MAX_OFILE_ALIGNMENT
 120 #define MAX_OFILE_ALIGNMENT 32768
 121
 122 /* Due to limitations in the target structure, it isn't currently possible
 123    to dynamically switch between the GNU and HP assemblers.  */
 124 #undef TARGET_GAS
 125
 126 /* Configure selects the standard ELFOS defines for use with GAS.  */
 127 #ifdef USING_ELFOS_H
 128
 129 /* We are using GAS.  */
 130 #define TARGET_GAS 1
 131
 132 #undef TARGET_ASM_FILE_START
 133 #define TARGET_ASM_FILE_START pa_hpux64_gas_file_start
 134
 135 /* This is how we output a null terminated string.  */
 136 #undef STRING_ASM_OP
 137 #define STRING_ASM_OP   "\t.stringz\t"
 138
 139 #define TEXT_SECTION_ASM_OP     "\t.text"
 140 #define DATA_SECTION_ASM_OP     "\t.data"
 141 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 142
 143 #define JCR_SECTION_NAME        ".jcr"
 144
 145 #define HP_INIT_ARRAY_SECTION_ASM_OP    "\t.section\t.init"
 146 #define GNU_INIT_ARRAY_SECTION_ASM_OP   "\t.section\t.init_array"
 147 #define HP_FINI_ARRAY_SECTION_ASM_OP    "\t.section\t.fini"
 148 #define GNU_FINI_ARRAY_SECTION_ASM_OP   "\t.section\t.fini_array"
 149
 150 /* We need to override the following two macros defined in elfos.h since
 151    the .comm directive has a different syntax and it can't be used for
 152    local common symbols.  */
 153 #undef ASM_OUTPUT_ALIGNED_COMMON
 154 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 155   pa_asm_output_aligned_common (FILE, NAME, SIZE, ALIGN)
 156
 157 #undef ASM_OUTPUT_ALIGNED_LOCAL
 158 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
 159   pa_asm_output_aligned_local (FILE, NAME, SIZE, ALIGN)
 160
 161 /* The define in pa.h doesn't work with the alias attribute.  The
 162    default is ok with the following define for GLOBAL_ASM_OP.  */
 163 #undef TARGET_ASM_GLOBALIZE_LABEL
 164
 165 /* This is how we globalize a label.  */
 166 #define GLOBAL_ASM_OP   "\t.globl\t"
 167
 168 /* Hacked version from defaults.h that uses assemble_name_raw
 169    instead of assemble_name.  A symbol in a type directive that
 170    isn't otherwise referenced doesn't cause the symbol to be
 171    placed in the symbol table of the assembled object.  */
 172 #undef ASM_OUTPUT_TYPE_DIRECTIVE
 173 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)           \
 174 do {                                                            \
 175   fputs (TYPE_ASM_OP, STREAM);                                  \
 176   assemble_name_raw (STREAM, NAME);                             \
 177   fputs (", ", STREAM);                                         \
 178   fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);                     \
 179   putc ('\n', STREAM);                                          \
 180 } while (0)
 181
 182 /* Hacked version from elfos.h that doesn't output a label.  */
 183 #undef ASM_DECLARE_FUNCTION_NAME
 184 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 185 do {                                                            \
 186   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");           \
 187   ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                \
 188 } while (0)
 189
 190 /* The type of external references must be set correctly for the
 191    dynamic loader to work correctly.  This is equivalent to the
 192    HP assembler's .IMPORT directive but relates more directly to
 193    ELF object file types.  */
 194 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                   \
 195   pa_hpux_asm_output_external ((FILE), (DECL), (NAME))
 196 #define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME)              \
 197 do {                                                            \
 198   if (FUNCTION_NAME_P (NAME))                                   \
 199     ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");         \
 200   else                                                          \
 201     ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");           \
 202 } while (0)
 203
 204 /* We need set the type for external libcalls.  Also note that not all
 205    libcall names are passed to targetm.encode_section_info (e.g., __main).
 206    Thus, we also have to do the section encoding if it hasn't been done
 207    already.  */
 208 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
 209 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)                  \
 210 do {                                                            \
 211   if (!FUNCTION_NAME_P (XSTR (FUN, 0)))                         \
 212     hppa_encode_label (FUN);                                    \
 213   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, XSTR (FUN, 0), "function");  \
 214 } while (0)
 215
 216 /* We need to use the HP style for internal labels.  */
 217 #undef ASM_GENERATE_INTERNAL_LABEL
 218 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 219   sprintf (LABEL, "*%c$%s%04ld", (PREFIX)[0], (PREFIX) + 1, (long)(NUM))
 220
 221 #else /* USING_ELFOS_H */
 222
 223 /* We are not using GAS.  */
 224 #define TARGET_GAS 0
 225
 226 /* HPUX 11 has the "new" HP assembler.  It's still lousy, but it's a whole
 227    lot better than the assembler shipped with older versions of hpux.
 228    However, it doesn't support weak symbols and is a bad fit with ELF.  */
 229 #undef NEW_HP_ASSEMBLER
 230 #define NEW_HP_ASSEMBLER 1
 231
 232 /* It looks like DWARF2 will be the easiest debug format to handle on this
 233    platform.  */
 234 #define DWARF2_DEBUGGING_INFO 1
 235 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 236
 237 /* This target uses the ELF object file format.  */
 238 #define OBJECT_FORMAT_ELF
 239
 240 #undef TARGET_ASM_FILE_START
 241 #define TARGET_ASM_FILE_START pa_hpux64_hpas_file_start
 242
 243 #undef TEXT_SECTION_ASM_OP
 244 #define TEXT_SECTION_ASM_OP             "\t.SUBSPA $CODE$\n"
 245 #undef READONLY_DATA_SECTION_ASM_OP
 246 #define READONLY_DATA_SECTION_ASM_OP    "\t.SUBSPA $LIT$\n"
 247 #undef DATA_SECTION_ASM_OP
 248 #define DATA_SECTION_ASM_OP             "\t.SUBSPA $DATA$\n"
 249 #undef BSS_SECTION_ASM_OP
 250 #define BSS_SECTION_ASM_OP              "\t.SUBSPA $BSS$\n"
 251
 252 /* We provide explicit defines for CTORS_SECTION_ASM_OP and
 253    DTORS_SECTION_ASM_OP since we don't yet have support for
 254    named sections with the HP assembler.  */
 255 #undef CTORS_SECTION_ASM_OP
 256 #define CTORS_SECTION_ASM_OP "\t.SUBSPA \\.ctors,QUAD=1,ALIGN=8,ACCESS=31"
 257 #undef DTORS_SECTION_ASM_OP
 258 #define DTORS_SECTION_ASM_OP "\t.SUBSPA \\.dtors,QUAD=1,ALIGN=8,ACCESS=31"
 259
 260 #define HP_INIT_ARRAY_SECTION_ASM_OP \
 261   "\t.SUBSPA \\.init,QUAD=1,ALIGN=8,ACCESS=31"
 262 #define GNU_INIT_ARRAY_SECTION_ASM_OP \
 263   "\t.SUBSPA \\.init_array,QUAD=1,ALIGN=8,ACCESS=31"
 264 #define HP_FINI_ARRAY_SECTION_ASM_OP \
 265   "\t.SUBSPA \\.fini,QUAD=1,ALIGN=8,ACCESS=31"
 266 #define GNU_FINI_ARRAY_SECTION_ASM_OP \
 267   "\t.SUBSPA \\.fini_array,QUAD=1,ALIGN=8,ACCESS=31"
 268
 269 #endif /* USING_ELFOS_H */
 270
 271 /* The following defines, used to run constructors and destructors with
 272    the SOM linker under HP-UX 11, are not needed.  */
 273 #undef HAS_INIT_SECTION
 274 #undef LD_INIT_SWITCH
 275 #undef LD_FINI_SWITCH
 276
 277 /* The following STARTFILE_SPEC and ENDFILE_SPEC defines provide the
 278    magic needed to run initializers and finalizers.  */
 279 #undef STARTFILE_SPEC
 280 #if TARGET_HPUX_11_11
 281 #define STARTFILE_SPEC \
 282   "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95.o%s} \
 283      %{!munix=93:%{!munix=95:unix98%O%s}}} %{static:crtbeginT%O%s} \
 284    %{!static:%{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}}"
 285 #else
 286 #define STARTFILE_SPEC \
 287   "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95%O%s}} \
 288    %{static:crtbeginT%O%s} %{!static:%{!shared:crtbegin%O%s} \
 289    %{shared:crtbeginS%O%s}}"
 290 #endif
 291 #undef ENDFILE_SPEC
 292 #define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}"
 293
 294 /* Since HP uses the .init and .fini sections for array initializers
 295    and finalizers, we need different defines for INIT_SECTION_ASM_OP
 296    and FINI_SECTION_ASM_OP.  With the implementation adopted below,
 297    the sections are not actually used.  However, we still must provide
 298    defines to select the proper code path.  */
 299 #undef INIT_SECTION_ASM_OP
 300 #define INIT_SECTION_ASM_OP
 301 #undef FINI_SECTION_ASM_OP
 302 #define FINI_SECTION_ASM_OP
 303
 304 /* We are using array initializers and don't want calls in the INIT
 305    and FINI sections.  */
 306 #undef CRT_CALL_STATIC_FUNCTION
 307 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)
 308
 309 /* The init_priority attribute is not supported with HP ld.  This could be
 310    supported if collect2 was used with LD_INIT_SWITCH.  Unfortunately, this
 311    approach doesn't work with GNU ld since HP-UX doesn't support DT_INIT,
 312    and therefore the -init and -fini GNU ld switches.  */
 313 #undef SUPPORTS_INIT_PRIORITY
 314 #define SUPPORTS_INIT_PRIORITY (TARGET_GNU_LD ? 1 : 0)
 315
 316 /* We use DTOR_LIST_BEGIN to carry a bunch of hacks to allow us to use
 317    the init and fini array sections with both the HP and GNU linkers.
 318    The linkers setup the required dynamic entries in the dynamic segment
 319    and the dynamic linker does the calls.  This approach avoids using
 320    collect2.
 321
 322    The first hack is to implement __do_global_ctors_aux in crtbegin as
 323    it needs to be the first entry in the init array so that it is called
 324    last.  HP got the order of the init array backwards.  The DT_INIT_ARRAY
 325    is supposed to be executed in the same order as the addresses appear in
 326    the array.  DT_FINI_ARRAY is supposed to be executed in the opposite
 327    order.
 328
 329    The second hack is stubs for __cxa_finalize and _Jv_RegisterClasses.
 330    The HP implementation of undefined weak symbols is broken.  The linker
 331    and dynamic loader both search for undefined weak symbols contrary the
 332    generic System V ABI.  An undefined weak symbol should resolve to a
 333    value of 0 rather than causing an error.  The prototypes for
 334    __cxa_finalize and _Jv_RegisterClasses in crtstuff.c are weak when
 335    weak is supported (GNU as), so in theory a strong define should override
 336    the stub functions provided here.
 337
 338    The final hack is a set of plabels to implement the effect of
 339    CRT_CALL_STATIC_FUNCTION.  HP-UX 11 only supports DI_INIT_ARRAY and
 340    DT_FINI_ARRAY and they put the arrays in .init and .fini, rather than
 341    in .init_array and .fini_array.  The standard defines for .init and
 342    .fini have the execute flag set.  So, the assembler has to be hacked
 343    to munge the standard flags for these sections to make them agree
 344    with what the HP linker expects.  With the GNU linker, we need to
 345    used the .init_array and .fini_array sections.  So, we set up for
 346    both just in case.  Once we have built the table, the linker does
 347    the rest of the work.
 348
 349    The order is significant.  Placing __do_global_ctors_aux first in
 350    the list, results in it being called last.  User specified initializers,
 351    either using the linker +init command or a plabel, run before the
 352    initializers specified here.  */
 353
 354 /* We need a __cxa_finalize stub if CRTSTUFFS_O is defined.  */
 355 #ifdef CRTSTUFFS_O
 356 #define PA_CXA_FINALIZE_STUB \
 357 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;              \
 358 void                                                                    \
 359 __cxa_finalize (void *p __attribute__((unused))) {}
 360 #else
 361 #define PA_CXA_FINALIZE_STUB
 362 #endif
 363
 364 /* We need a _Jv_RegisterClasses stub if JCR_SECTION_NAME is defined.  */
 365 #ifdef JCR_SECTION_NAME
 366 #define PA_JV_REGISTERCLASSES_STUB \
 367 void                                                                    \
 368 _Jv_RegisterClasses (void *p __attribute__((unused))) {}
 369 #else
 370 #define PA_JV_REGISTERCLASSES_STUB
 371 #endif
 372
 373 /* We need to add frame_dummy to the initializer list if EH_FRAME_SECTION_NAME
 374    or JCR_SECTION_NAME is defined.  */
 375 #if defined(EH_FRAME_SECTION_NAME) || defined(JCR_SECTION_NAME)
 376 #define PA_INIT_FRAME_DUMMY_ASM_OP ".dword P%frame_dummy"
 377 #else
 378 #define PA_INIT_FRAME_DUMMY_ASM_OP ""
 379 #endif
 380
 381 #define PA_INIT_FINI_HACK \
 382 static void __attribute__((used))                                       \
 383 __do_global_ctors_aux (void)                                            \
 384 {                                                                       \
 385   func_ptr *p = __CTOR_LIST__;                                          \
 386   while (*(p + 1))                                                      \
 387     p++;                                                                \
 388   for (; *p != (func_ptr) -1; p--)                                      \
 389     (*p) ();                                                            \
 390 }                                                                       \
 391                                                                         \
 392 PA_CXA_FINALIZE_STUB                                                    \
 393 PA_JV_REGISTERCLASSES_STUB                                              \
 394                                                                         \
 395 asm (HP_INIT_ARRAY_SECTION_ASM_OP);                                     \
 396 asm (".dword P%__do_global_ctors_aux");                                 \
 397 asm (PA_INIT_FRAME_DUMMY_ASM_OP);                                       \
 398 asm (GNU_INIT_ARRAY_SECTION_ASM_OP);                                    \
 399 asm (".dword P%__do_global_ctors_aux");                                 \
 400 asm (PA_INIT_FRAME_DUMMY_ASM_OP);                                       \
 401 asm (HP_FINI_ARRAY_SECTION_ASM_OP);                                     \
 402 asm (".dword P%__do_global_dtors_aux");                                 \
 403 asm (GNU_FINI_ARRAY_SECTION_ASM_OP);                                    \
 404 asm (".dword P%__do_global_dtors_aux")
 405
 406 /* The following two variants of DTOR_LIST_BEGIN are identical to those
 407    in crtstuff.c except for the addition of the above init-fini hack.  */
 408 #ifdef DTORS_SECTION_ASM_OP
 409 #define DTOR_LIST_BEGIN \
 410 asm (DTORS_SECTION_ASM_OP);                                             \
 411 STATIC func_ptr __DTOR_LIST__[1]                                        \
 412   __attribute__ ((aligned(sizeof(func_ptr))))                           \
 413   = { (func_ptr) (-1) };                                                \
 414 PA_INIT_FINI_HACK
 415 #else
 416 #define DTOR_LIST_BEGIN \
 417 STATIC func_ptr __DTOR_LIST__[1]                                        \
 418   __attribute__ ((section(".dtors"), aligned(sizeof(func_ptr))))        \
 419   = { (func_ptr) (-1) };                                                \
 420 PA_INIT_FINI_HACK
 421 #endif
 422
 423 /* If using HP ld do not call pxdb.  Use size as a program that does nothing
 424    and returns 0.  /bin/true cannot be used because it is a script without
 425    an interpreter.  */
 426 #define INIT_ENVIRONMENT "LD_PXDB=/usr/ccs/bin/size"
 427
 428 /* The HPUX dynamic linker objects to weak symbols with no
 429    definitions, so do not use them in gthr-posix.h.  */
 430 #define GTHREAD_USE_WEAK 0