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, 2007 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 3, 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 COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 /* We can debug dynamically linked executables on hpux11; we also
  23    want dereferencing of a NULL pointer to cause a SEGV.  Do not move
  24    the "+Accept TypeMismatch" switch.  We check for it in collect2
  25    to determine which init/fini is needed.  */
  26 #undef LINK_SPEC
  27 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
  28 #define LINK_SPEC \
  29   "%{!shared:%{p:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  30      %nWarning: consider linking with `-static' as system libraries with\n\
  31      %n  profiling support are only provided in archive format}}}\
  32    %{!shared:%{pg:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  33      %nWarning: consider linking with `-static' as system libraries with\n\
  34      %n  profiling support are only provided in archive format}}}\
  35    %{mhp-ld:+Accept TypeMismatch -z} -E %{mlinker-opt:-O}\
  36    %{!shared:-u main %{!nostdlib:%{!nodefaultlibs:-u __cxa_finalize}}}\
  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}\
  47    %{!shared:-u main %{!nostdlib:%{!nodefaultlibs:-u __cxa_finalize}}}\
  48    %{static:-a archive} %{shared:%{mgnu-ld:-shared}%{!mgnu-ld:-b}}"
  49 #endif
  50
  51 /* Profiling support is only provided in libc.a.  However, libprof and
  52    libgprof are only available in shared form on HP-UX 11.00.  We use
  53    the shared form if we are using the GNU linker or an archive form
  54    isn't available.  We also usually need to link with libdld and it's
  55    only available in shared form.  */
  56 #undef LIB_SPEC
  57 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
  58 #define LIB_SPEC \
  59   "%{!shared:\
  60      %{!p:%{!pg: %{static|mt|pthread:-lpthread} -lc\
  61             %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  62      %{p:%{!pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
  63            -lprof %{static:-a archive} %{static|mt|pthread:-lpthread} -lc\
  64            %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  65      %{pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
  66        -lgprof %{static:-a archive} %{static|mt|pthread:-lpthread} -lc\
  67        %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  68    %{shared:%{mt|pthread:-lpthread}}"
  69 #else
  70 #define LIB_SPEC \
  71   "%{!shared:\
  72      %{!p:%{!pg: %{static|mt|pthread:-lpthread} -lc\
  73             %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  74      %{p:%{!pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
  75            -lprof %{static:-a archive} %{static|mt|pthread:-lpthread} -lc\
  76            %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  77      %{pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
  78        -lgprof %{static:-a archive} %{static|mt|pthread:-lpthread} -lc\
  79        %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  80    %{shared:%{mt|pthread:-lpthread}}"
  81 #endif
  82
  83 /* The libgcc_stub.a and milli.a libraries need to come last.  */
  84 #undef LINK_GCC_C_SEQUENCE_SPEC
  85 #define LINK_GCC_C_SEQUENCE_SPEC "\
  86   %G %L %G %{!nostdlib:%{!nodefaultlibs:%{!shared:-lgcc_stub}\
  87   /usr/lib/pa20_64/milli.a}}"
  88
  89 /* Under hpux11, the normal location of the `ld' and `as' programs is the
  90    /usr/ccs/bin directory.  */
  91
  92 #ifndef CROSS_DIRECTORY_STRUCTURE
  93 #undef MD_EXEC_PREFIX
  94 #define MD_EXEC_PREFIX "/usr/ccs/bin"
  95 #endif
  96
  97 /* Default prefixes.  */
  98
  99 #undef STANDARD_STARTFILE_PREFIX_1
 100 #define STANDARD_STARTFILE_PREFIX_1 "/lib/pa20_64/"
 101
 102 #undef STANDARD_STARTFILE_PREFIX_2
 103 #define STANDARD_STARTFILE_PREFIX_2 "/usr/lib/pa20_64/"
 104
 105 /* Under hpux11 the normal location of the various pa20_64 *crt*.o files
 106    is the /usr/ccs/lib/pa20_64 directory.  Some files may also be in the
 107    /opt/langtools/lib/pa20_64 directory.  */
 108
 109 #ifndef CROSS_DIRECTORY_STRUCTURE
 110 #undef MD_STARTFILE_PREFIX
 111 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/pa20_64/"
 112 #endif
 113
 114 #ifndef CROSS_DIRECTORY_STRUCTURE
 115 #undef MD_STARTFILE_PREFIX_1
 116 #define MD_STARTFILE_PREFIX_1 "/opt/langtools/lib/pa20_64/"
 117 #endif
 118
 119 /* This macro specifies the biggest alignment supported by the object
 120    file format of this machine.
 121
 122    The .align directive in the HP assembler allows alignments up to
 123    4096 bytes.  However, the maximum alignment of a global common symbol
 124    is 16 bytes using HP ld.  Unfortunately, this macro doesn't provide
 125    a method to check for common symbols.  */
 126 #undef MAX_OFILE_ALIGNMENT
 127 #define MAX_OFILE_ALIGNMENT 32768
 128
 129 /* Due to limitations in the target structure, it isn't currently possible
 130    to dynamically switch between the GNU and HP assemblers.  */
 131 #undef TARGET_GAS
 132
 133 /* Configure selects the standard ELFOS defines for use with GAS.  */
 134 #ifdef USING_ELFOS_H
 135
 136 /* We are using GAS.  */
 137 #define TARGET_GAS 1
 138
 139 #undef TARGET_ASM_FILE_START
 140 #define TARGET_ASM_FILE_START pa_hpux64_gas_file_start
 141
 142 /* This is how we output a null terminated string.  */
 143 #undef STRING_ASM_OP
 144 #define STRING_ASM_OP   "\t.stringz\t"
 145
 146 #define TEXT_SECTION_ASM_OP     "\t.text"
 147 #define DATA_SECTION_ASM_OP     "\t.data"
 148 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 149
 150 #define JCR_SECTION_NAME        ".jcr"
 151
 152 #define HP_INIT_ARRAY_SECTION_ASM_OP    "\t.section\t.init"
 153 #define GNU_INIT_ARRAY_SECTION_ASM_OP   "\t.section\t.init_array"
 154 #define HP_FINI_ARRAY_SECTION_ASM_OP    "\t.section\t.fini"
 155 #define GNU_FINI_ARRAY_SECTION_ASM_OP   "\t.section\t.fini_array"
 156
 157 /* We need to override the following two macros defined in elfos.h since
 158    the .comm directive has a different syntax and it can't be used for
 159    local common symbols.  */
 160 #undef ASM_OUTPUT_ALIGNED_COMMON
 161 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 162   pa_asm_output_aligned_common (FILE, NAME, SIZE, ALIGN)
 163
 164 #undef ASM_OUTPUT_ALIGNED_LOCAL
 165 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
 166   pa_asm_output_aligned_local (FILE, NAME, SIZE, ALIGN)
 167
 168 /* The define in pa.h doesn't work with the alias attribute.  The
 169    default is ok with the following define for GLOBAL_ASM_OP.  */
 170 #undef TARGET_ASM_GLOBALIZE_LABEL
 171
 172 /* This is how we globalize a label.  */
 173 #define GLOBAL_ASM_OP   "\t.globl\t"
 174
 175 /* Hacked version from defaults.h that uses assemble_name_raw
 176    instead of assemble_name.  A symbol in a type directive that
 177    isn't otherwise referenced doesn't cause the symbol to be
 178    placed in the symbol table of the assembled object.  */
 179 #undef ASM_OUTPUT_TYPE_DIRECTIVE
 180 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)           \
 181 do {                                                            \
 182   fputs (TYPE_ASM_OP, STREAM);                                  \
 183   assemble_name_raw (STREAM, NAME);                             \
 184   fputs (", ", STREAM);                                         \
 185   fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);                     \
 186   putc ('\n', STREAM);                                          \
 187 } while (0)
 188
 189 /* Hacked version from elfos.h that doesn't output a label.  */
 190 #undef ASM_DECLARE_FUNCTION_NAME
 191 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 192 do {                                                            \
 193   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");           \
 194   ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                \
 195 } while (0)
 196
 197 /* The type of external references must be set correctly for the
 198    dynamic loader to work correctly.  This is equivalent to the
 199    HP assembler's .IMPORT directive but relates more directly to
 200    ELF object file types.  */
 201 #undef ASM_OUTPUT_EXTERNAL
 202 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                   \
 203   pa_hpux_asm_output_external ((FILE), (DECL), (NAME))
 204 #define ASM_OUTPUT_EXTERNAL_REAL(FILE, DECL, NAME)              \
 205 do {                                                            \
 206   if (FUNCTION_NAME_P (NAME))                                   \
 207     ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");         \
 208   else                                                          \
 209     ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");           \
 210 } while (0)
 211
 212 /* We need set the type for external libcalls.  Also note that not all
 213    libcall names are passed to targetm.encode_section_info (e.g., __main).
 214    Thus, we also have to do the section encoding if it hasn't been done
 215    already.  */
 216 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
 217 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)                  \
 218 do {                                                            \
 219   if (!FUNCTION_NAME_P (XSTR (FUN, 0)))                         \
 220     hppa_encode_label (FUN);                                    \
 221   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, XSTR (FUN, 0), "function");  \
 222 } while (0)
 223
 224 /* We need to use the HP style for internal labels.  */
 225 #undef ASM_GENERATE_INTERNAL_LABEL
 226 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 227   sprintf (LABEL, "*%c$%s%04ld", (PREFIX)[0], (PREFIX) + 1, (long)(NUM))
 228
 229 #else /* USING_ELFOS_H */
 230
 231 /* We are not using GAS.  */
 232 #define TARGET_GAS 0
 233
 234 /* HPUX 11 has the "new" HP assembler.  It's still lousy, but it's a whole
 235    lot better than the assembler shipped with older versions of hpux.
 236    However, it doesn't support weak symbols and is a bad fit with ELF.  */
 237 #undef NEW_HP_ASSEMBLER
 238 #define NEW_HP_ASSEMBLER 1
 239
 240 /* It looks like DWARF2 will be the easiest debug format to handle on this
 241    platform.  */
 242 #define DWARF2_DEBUGGING_INFO 1
 243 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 244
 245 /* This target uses the ELF object file format.  */
 246 #define OBJECT_FORMAT_ELF
 247
 248 #undef TARGET_ASM_FILE_START
 249 #define TARGET_ASM_FILE_START pa_hpux64_hpas_file_start
 250
 251 #undef TEXT_SECTION_ASM_OP
 252 #define TEXT_SECTION_ASM_OP             "\t.SUBSPA $CODE$\n"
 253 #undef READONLY_DATA_SECTION_ASM_OP
 254 #define READONLY_DATA_SECTION_ASM_OP    "\t.SUBSPA $LIT$\n"
 255 #undef DATA_SECTION_ASM_OP
 256 #define DATA_SECTION_ASM_OP             "\t.SUBSPA $DATA$\n"
 257 #undef BSS_SECTION_ASM_OP
 258 #define BSS_SECTION_ASM_OP              "\t.SUBSPA $BSS$\n"
 259
 260 /* We provide explicit defines for CTORS_SECTION_ASM_OP and
 261    DTORS_SECTION_ASM_OP since we don't yet have support for
 262    named sections with the HP assembler.  */
 263 #undef CTORS_SECTION_ASM_OP
 264 #define CTORS_SECTION_ASM_OP "\t.SUBSPA \\.ctors,QUAD=1,ALIGN=8,ACCESS=31"
 265 #undef DTORS_SECTION_ASM_OP
 266 #define DTORS_SECTION_ASM_OP "\t.SUBSPA \\.dtors,QUAD=1,ALIGN=8,ACCESS=31"
 267
 268 #define HP_INIT_ARRAY_SECTION_ASM_OP \
 269   "\t.SUBSPA \\.init,QUAD=1,ALIGN=8,ACCESS=31"
 270 #define GNU_INIT_ARRAY_SECTION_ASM_OP \
 271   "\t.SUBSPA \\.init_array,QUAD=1,ALIGN=8,ACCESS=31"
 272 #define HP_FINI_ARRAY_SECTION_ASM_OP \
 273   "\t.SUBSPA \\.fini,QUAD=1,ALIGN=8,ACCESS=31"
 274 #define GNU_FINI_ARRAY_SECTION_ASM_OP \
 275   "\t.SUBSPA \\.fini_array,QUAD=1,ALIGN=8,ACCESS=31"
 276
 277 #endif /* USING_ELFOS_H */
 278
 279 /* The following defines, used to run constructors and destructors with
 280    the SOM linker under HP-UX 11, are not needed.  */
 281 #undef HAS_INIT_SECTION
 282 #undef LD_INIT_SWITCH
 283 #undef LD_FINI_SWITCH
 284
 285 /* The following STARTFILE_SPEC and ENDFILE_SPEC defines provide the
 286    magic needed to run initializers and finalizers.  */
 287 #undef STARTFILE_SPEC
 288 #if TARGET_HPUX_11_11
 289 #define STARTFILE_SPEC \
 290   "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95.o%s} \
 291      %{!munix=93:%{!munix=95:unix98%O%s}}} %{static:crtbeginT%O%s} \
 292    %{!static:%{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}}"
 293 #else
 294 #define STARTFILE_SPEC \
 295   "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95%O%s}} \
 296    %{static:crtbeginT%O%s} %{!static:%{!shared:crtbegin%O%s} \
 297    %{shared:crtbeginS%O%s}}"
 298 #endif
 299 #undef ENDFILE_SPEC
 300 #define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}"
 301
 302 /* Since HP uses the .init and .fini sections for array initializers
 303    and finalizers, we need different defines for INIT_SECTION_ASM_OP
 304    and FINI_SECTION_ASM_OP.  With the implementation adopted below,
 305    the sections are not actually used.  However, we still must provide
 306    defines to select the proper code path.  */
 307 #undef INIT_SECTION_ASM_OP
 308 #define INIT_SECTION_ASM_OP
 309 #undef FINI_SECTION_ASM_OP
 310 #define FINI_SECTION_ASM_OP
 311
 312 /* We are using array initializers and don't want calls in the INIT
 313    and FINI sections.  */
 314 #undef CRT_CALL_STATIC_FUNCTION
 315 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)
 316
 317 /* The init_priority attribute is not supported with HP ld.  This could be
 318    supported if collect2 was used with LD_INIT_SWITCH.  Unfortunately, this
 319    approach doesn't work with GNU ld since HP-UX doesn't support DT_INIT,
 320    and therefore the -init and -fini GNU ld switches.  */
 321 #undef SUPPORTS_INIT_PRIORITY
 322 #define SUPPORTS_INIT_PRIORITY (TARGET_GNU_LD ? 1 : 0)
 323
 324 /* We use DTOR_LIST_BEGIN to carry a bunch of hacks to allow us to use
 325    the init and fini array sections with both the HP and GNU linkers.
 326    The linkers setup the required dynamic entries in the dynamic segment
 327    and the dynamic linker does the calls.  This approach avoids using
 328    collect2.
 329
 330    The first hack is to implement __do_global_ctors_aux in crtbegin as
 331    it needs to be the first entry in the init array so that it is called
 332    last.  HP got the order of the init array backwards.  The DT_INIT_ARRAY
 333    is supposed to be executed in the same order as the addresses appear in
 334    the array.  DT_FINI_ARRAY is supposed to be executed in the opposite
 335    order.
 336
 337    The second hack is a set of plabels to implement the effect of
 338    CRT_CALL_STATIC_FUNCTION.  HP-UX 11 only supports DI_INIT_ARRAY and
 339    DT_FINI_ARRAY and they put the arrays in .init and .fini, rather than
 340    in .init_array and .fini_array.  The standard defines for .init and
 341    .fini have the execute flag set.  So, the assembler has to be hacked
 342    to munge the standard flags for these sections to make them agree
 343    with what the HP linker expects.  With the GNU linker, we need to
 344    used the .init_array and .fini_array sections.  So, we set up for
 345    both just in case.  Once we have built the table, the linker does
 346    the rest of the work.
 347
 348    The order is significant.  Placing __do_global_ctors_aux first in
 349    the list, results in it being called last.  User specified initializers,
 350    either using the linker +init command or a plabel, run before the
 351    initializers specified here.  */
 352
 353 /* We need to add frame_dummy to the initializer list if EH_FRAME_SECTION_NAME
 354    or JCR_SECTION_NAME is defined.  */
 355 #if defined(EH_FRAME_SECTION_NAME) || defined(JCR_SECTION_NAME)
 356 #define PA_INIT_FRAME_DUMMY_ASM_OP ".dword P%frame_dummy"
 357 #else
 358 #define PA_INIT_FRAME_DUMMY_ASM_OP ""
 359 #endif
 360
 361 /* The following hack sets up the .init, .init_array, .fini and
 362    .fini_array sections.  */
 363 #define PA_CRTBEGIN_HACK \
 364 asm (TEXT_SECTION_ASM_OP);                                              \
 365 static void __attribute__((used))                                       \
 366 __do_global_ctors_aux (void)                                            \
 367 {                                                                       \
 368   func_ptr *p = __CTOR_LIST__;                                          \
 369   while (*(p + 1))                                                      \
 370     p++;                                                                \
 371   for (; *p != (func_ptr) -1; p--)                                      \
 372     (*p) ();                                                            \
 373 }                                                                       \
 374                                                                         \
 375 asm (HP_INIT_ARRAY_SECTION_ASM_OP);                                     \
 376 asm (".align 8");                                                       \
 377 asm (".dword P%__do_global_ctors_aux");                                 \
 378 asm (PA_INIT_FRAME_DUMMY_ASM_OP);                                       \
 379 asm (GNU_INIT_ARRAY_SECTION_ASM_OP);                                    \
 380 asm (".align 8");                                                       \
 381 asm (".dword P%__do_global_ctors_aux");                                 \
 382 asm (PA_INIT_FRAME_DUMMY_ASM_OP);                                       \
 383 asm (HP_FINI_ARRAY_SECTION_ASM_OP);                                     \
 384 asm (".align 8");                                                       \
 385 asm (".dword P%__do_global_dtors_aux");                                 \
 386 asm (GNU_FINI_ARRAY_SECTION_ASM_OP);                                    \
 387 asm (".align 8");                                                       \
 388 asm (".dword P%__do_global_dtors_aux")
 389
 390 /* The following two variants of DTOR_LIST_BEGIN are identical to those
 391    in crtstuff.c except for the addition of the above crtbegin hack.  */
 392 #ifdef DTORS_SECTION_ASM_OP
 393 #define DTOR_LIST_BEGIN \
 394 asm (DTORS_SECTION_ASM_OP);                                             \
 395 STATIC func_ptr __DTOR_LIST__[1]                                        \
 396   __attribute__ ((aligned(sizeof(func_ptr))))                           \
 397   = { (func_ptr) (-1) };                                                \
 398 PA_CRTBEGIN_HACK
 399 #else
 400 #define DTOR_LIST_BEGIN \
 401 STATIC func_ptr __DTOR_LIST__[1]                                        \
 402   __attribute__ ((section(".dtors"), aligned(sizeof(func_ptr))))        \
 403   = { (func_ptr) (-1) };                                                \
 404 PA_CRTBEGIN_HACK
 405 #endif
 406
 407 /* If using HP ld do not call pxdb.  Use size as a program that does nothing
 408    and returns 0.  /bin/true cannot be used because it is a script without
 409    an interpreter.  */
 410 #define INIT_ENVIRONMENT "LD_PXDB=/usr/ccs/bin/size"
 411
 412 /* The HPUX dynamic linker objects to undefined weak symbols, so do
 413    not use them in gthr-posix.h.  */
 414 #define GTHREAD_USE_WEAK 0
 415
 416 /* We don't want undefined weak references to __register_frame_info,
 417    __deregister_frame_info, _Jv_RegisterClasses and __cxa_finalize
 418    introduced by crtbegin.o.  The GNU linker only resolves weak
 419    references if they appear in a shared library.  Thus, it would be
 420    impossible to create a static executable if the symbols were weak.
 421    So, the best solution seems to be to make the symbols strong and
 422    provide an archive library of empty stub functions.  */
 423 #define TARGET_ATTRIBUTE_WEAK