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, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 #undef SUBTARGET_SWITCHES
  24 #define SUBTARGET_SWITCHES                              \
  25   { "sio",       MASK_SIO,                              \
  26      N_("Generate cpp defines for server IO") },        \
  27   { "wsio",     -MASK_SIO,                              \
  28      N_("Generate cpp defines for workstation IO") },   \
  29   {"gnu-ld",     MASK_GNU_LD,                           \
  30      N_("Assume code will be linked by GNU ld") },      \
  31   {"hp-ld",     -MASK_GNU_LD,                           \
  32      N_("Assume code will be linked by HP ld") },
  33
  34 /* We can debug dynamically linked executables on hpux11; we also
  35    want dereferencing of a NULL pointer to cause a SEGV.  Do not move
  36    the "+Accept TypeMismatch" switch.  We check for it in collect2
  37    to determine which init/fini is needed.  */
  38 #undef LINK_SPEC
  39 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
  40 #define LINK_SPEC \
  41   "%{!shared:%{p:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  42      %nWarning: consider linking with `-static' as system libraries with\n\
  43      %n  profiling support are only provided in archive format}}}\
  44    %{!shared:%{pg:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  45      %nWarning: consider linking with `-static' as system libraries with\n\
  46      %n  profiling support are only provided in archive format}}}\
  47    %{mhp-ld:+Accept TypeMismatch -z} -E %{mlinker-opt:-O} %{!shared:-u main}\
  48    %{static:-a archive} %{shared:%{mhp-ld:-b}%{!mhp-ld:-shared}}"
  49 #else
  50 #define LINK_SPEC \
  51   "%{!shared:%{p:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  52      %nWarning: consider linking with `-static' as system libraries with\n\
  53      %n  profiling support are only provided in archive format}}}\
  54    %{!shared:%{pg:-L/lib/pa20_64/libp -L/usr/lib/pa20_64/libp %{!static:\
  55      %nWarning: consider linking with `-static' as system libraries with\n\
  56      %n  profiling support are only provided in archive format}}}\
  57    %{!mgnu-ld:+Accept TypeMismatch -z} -E %{mlinker-opt:-O} %{!shared:-u main}\
  58    %{static:-a archive} %{shared:%{mgnu-ld:-shared}%{!mgnu-ld:-b}}"
  59 #endif
  60
  61 /* Profiling support is only provided in libc.a.  However, libprof and
  62    libgprof are only available in shared form on HP-UX 11.00.  We use
  63    the shared form if we are using the GNU linker or an archive form
  64    isn't available.  We also usually need to link with libdld and it's
  65    only available in shared form.  */
  66 #undef LIB_SPEC
  67 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
  68 #define LIB_SPEC \
  69   "%{!shared:\
  70      %{!p:%{!pg: -lc %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  71      %{p:%{!pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
  72            -lprof %{static:-a archive} -lc\
  73            %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  74      %{pg:%{static:%{!mhp-ld:-a shared}%{mhp-ld:-a archive_shared}}\
  75        -lgprof %{static:-a archive} -lc\
  76        %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  77    /usr/lib/pa20_64/milli.a"
  78 #else
  79 #define LIB_SPEC \
  80   "%{!shared:\
  81      %{!p:%{!pg: -lc %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  82      %{p:%{!pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
  83            -lprof %{static:-a archive} -lc\
  84            %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  85      %{pg:%{static:%{mgnu-ld:-a shared}%{!mgnu-ld:-a archive_shared}}\
  86        -lgprof %{static:-a archive} -lc\
  87        %{static:%{!nolibdld:-a shared -ldld -a archive -lc}}}}\
  88    /usr/lib/pa20_64/milli.a"
  89 #endif
  90
  91 /* Under hpux11, the normal location of the `ld' and `as' programs is the
  92    /usr/ccs/bin directory.  */
  93
  94 #ifndef CROSS_COMPILE
  95 #undef MD_EXEC_PREFIX
  96 #define MD_EXEC_PREFIX "/usr/ccs/bin"
  97 #endif
  98
  99 /* Default prefixes.  */
 100
 101 #undef STANDARD_STARTFILE_PREFIX_1
 102 #define STANDARD_STARTFILE_PREFIX_1 "/lib/pa20_64/"
 103
 104 #undef STANDARD_STARTFILE_PREFIX_2
 105 #define STANDARD_STARTFILE_PREFIX_2 "/usr/lib/pa20_64/"
 106
 107 /* Under hpux11 the normal location of the various pa20_64 *crt*.o files
 108    is the /usr/ccs/lib/pa20_64 directory.  Some files may also be in the
 109    /opt/langtools/lib/pa20_64 directory.  */
 110
 111 #ifndef CROSS_COMPILE
 112 #undef MD_STARTFILE_PREFIX
 113 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/pa20_64/"
 114 #endif
 115
 116 #ifndef CROSS_COMPILE
 117 #undef MD_STARTFILE_PREFIX_1
 118 #define MD_STARTFILE_PREFIX_1 "/opt/langtools/lib/pa20_64/"
 119 #endif
 120
 121 /* This macro specifies the biggest alignment supported by the object
 122    file format of this machine.
 123
 124    The .align directive in the HP assembler allows alignments up to
 125    4096 bytes.  However, the maximum alignment of a global common symbol
 126    is 16 bytes using HP ld.  Unfortunately, this macro doesn't provide
 127    a method to check for common symbols.  */
 128 #undef MAX_OFILE_ALIGNMENT
 129 #define MAX_OFILE_ALIGNMENT 32768
 130
 131 /* Due to limitations in the target structure, it isn't currently possible
 132    to dynamically switch between the GNU and HP assemblers.  */
 133 #undef TARGET_GAS
 134
 135 /* Configure selects the standard ELFOS defines for use with GAS.  */
 136 #ifdef USING_ELFOS_H
 137
 138 /* We are using GAS.  */
 139 #define TARGET_GAS 1
 140
 141 #undef TARGET_ASM_FILE_START
 142 #define TARGET_ASM_FILE_START pa_hpux64_gas_file_start
 143
 144 /* This is how we output a null terminated string.  */
 145 #undef STRING_ASM_OP
 146 #define STRING_ASM_OP   "\t.stringz\t"
 147
 148 #define TEXT_SECTION_ASM_OP     "\t.text"
 149 #define DATA_SECTION_ASM_OP     "\t.data"
 150 #define BSS_SECTION_ASM_OP      "\t.section\t.bss"
 151
 152 #define JCR_SECTION_NAME        ".jcr"
 153
 154 #define HP_INIT_ARRAY_SECTION_ASM_OP    "\t.section\t.init"
 155 #define GNU_INIT_ARRAY_SECTION_ASM_OP   "\t.section\t.init_array"
 156 #define HP_FINI_ARRAY_SECTION_ASM_OP    "\t.section\t.fini"
 157 #define GNU_FINI_ARRAY_SECTION_ASM_OP   "\t.section\t.fini_array"
 158
 159 /* We need to override the following two macros defined in elfos.h since
 160    the .comm directive has a different syntax and it can't be used for
 161    local common symbols.  */
 162 #undef ASM_OUTPUT_ALIGNED_COMMON
 163 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 164   pa_asm_output_aligned_common (FILE, NAME, SIZE, ALIGN)
 165
 166 #undef ASM_OUTPUT_ALIGNED_LOCAL
 167 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)               \
 168   pa_asm_output_aligned_local (FILE, NAME, SIZE, ALIGN)
 169
 170 /* The define in pa.h doesn't work with the alias attribute.  The
 171    default is ok with the following define for GLOBAL_ASM_OP.  */
 172 #undef TARGET_ASM_GLOBALIZE_LABEL
 173
 174 /* This is how we globalize a label.  */
 175 #define GLOBAL_ASM_OP   "\t.globl\t"
 176
 177 /* Hacked version from elfos.h that doesn't output a label.  */
 178 #undef ASM_DECLARE_FUNCTION_NAME
 179 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
 180 do {                                                            \
 181   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");           \
 182   ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                \
 183 } while (0)
 184
 185 /* The type of external references must be set correctly for the
 186    dynamic loader to work correctly.  This is equivalent to the
 187    HP assembler's .IMPORT directive but relates more directly to
 188    ELF object file types.  */
 189 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 190 do {                                                                    \
 191   int save_referenced;                                                  \
 192   save_referenced = TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL));\
 193   if (FUNCTION_NAME_P (NAME))                                           \
 194     ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");                 \
 195   else                                                                  \
 196     ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                   \
 197   TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (DECL)) = save_referenced;\
 198 } while (0)
 199
 200 /* We need set the type for external libcalls.  Also note that not all
 201    libcall names are passed to targetm.encode_section_info (e.g., __main).
 202    Thus, we also have to do the section encoding if it hasn't been done
 203    already.  */
 204 #undef ASM_OUTPUT_EXTERNAL_LIBCALL
 205 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)                  \
 206 do {                                                            \
 207   if (!FUNCTION_NAME_P (XSTR (FUN, 0)))                         \
 208     hppa_encode_label (FUN);                                    \
 209   ASM_OUTPUT_TYPE_DIRECTIVE (FILE, XSTR (FUN, 0), "function");  \
 210 } while (0)
 211
 212 /* We need to use the HP style for internal labels.  */
 213 #undef ASM_GENERATE_INTERNAL_LABEL
 214 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
 215   sprintf (LABEL, "*%c$%s%04ld", (PREFIX)[0], (PREFIX) + 1, (long)(NUM))
 216
 217 #else /* USING_ELFOS_H */
 218
 219 /* We are not using GAS.  */
 220 #define TARGET_GAS 0
 221
 222 /* HPUX 11 has the "new" HP assembler.  It's still lousy, but it's a whole
 223    lot better than the assembler shipped with older versions of hpux.
 224    However, it doesn't support weak symbols and is a bad fit with ELF.  */
 225 #undef NEW_HP_ASSEMBLER
 226 #define NEW_HP_ASSEMBLER 1
 227
 228 /* It looks like DWARF2 will be the easiest debug format to handle on this
 229    platform.  */
 230 #define DWARF2_DEBUGGING_INFO 1
 231 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 232
 233 /* This target uses the ELF object file format.  */
 234 #define OBJECT_FORMAT_ELF
 235
 236 #undef TARGET_ASM_FILE_START
 237 #define TARGET_ASM_FILE_START pa_hpux64_hpas_file_start
 238
 239 #undef TEXT_SECTION_ASM_OP
 240 #define TEXT_SECTION_ASM_OP             "\t.SUBSPA $CODE$\n"
 241 #undef READONLY_DATA_SECTION_ASM_OP
 242 #define READONLY_DATA_SECTION_ASM_OP    "\t.SUBSPA $LIT$\n"
 243 #undef DATA_SECTION_ASM_OP
 244 #define DATA_SECTION_ASM_OP             "\t.SUBSPA $DATA$\n"
 245 #undef BSS_SECTION_ASM_OP
 246 #define BSS_SECTION_ASM_OP              "\t.SUBSPA $BSS$\n"
 247
 248 /* We provide explicit defines for CTORS_SECTION_ASM_OP and
 249    DTORS_SECTION_ASM_OP since we don't yet have support for
 250    named sections with the HP assembler.  */
 251 #undef CTORS_SECTION_ASM_OP
 252 #define CTORS_SECTION_ASM_OP "\t.SUBSPA \\.ctors,QUAD=1,ALIGN=8,ACCESS=31"
 253 #undef DTORS_SECTION_ASM_OP
 254 #define DTORS_SECTION_ASM_OP "\t.SUBSPA \\.dtors,QUAD=1,ALIGN=8,ACCESS=31"
 255
 256 #define HP_INIT_ARRAY_SECTION_ASM_OP \
 257   "\t.SUBSPA \\.init,QUAD=1,ALIGN=8,ACCESS=31"
 258 #define GNU_INIT_ARRAY_SECTION_ASM_OP \
 259   "\t.SUBSPA \\.init_array,QUAD=1,ALIGN=8,ACCESS=31"
 260 #define HP_FINI_ARRAY_SECTION_ASM_OP \
 261   "\t.SUBSPA \\.fini,QUAD=1,ALIGN=8,ACCESS=31"
 262 #define GNU_FINI_ARRAY_SECTION_ASM_OP \
 263   "\t.SUBSPA \\.fini_array,QUAD=1,ALIGN=8,ACCESS=31"
 264
 265 #endif /* USING_ELFOS_H */
 266
 267 /* The following defines, used to run constructors and destructors with
 268    the SOM linker under HP-UX 11, are not needed.  */
 269 #undef HAS_INIT_SECTION
 270 #undef LD_INIT_SWITCH
 271 #undef LD_FINI_SWITCH
 272
 273 /* The following STARTFILE_SPEC and ENDFILE_SPEC defines provide the
 274    magic needed to run initializers and finalizers.  */
 275 #undef STARTFILE_SPEC
 276 #if TARGET_HPUX_11_11
 277 #define STARTFILE_SPEC \
 278   "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95.o%s} \
 279      %{!munix=93:%{!munix=95:unix98%O%s}}} %{static:crtbeginT%O%s} \
 280    %{!static:%{!shared:crtbegin%O%s} %{shared:crtbeginS%O%s}}"
 281 #else
 282 #define STARTFILE_SPEC \
 283   "%{!shared: %{!symbolic: crt0%O%s} %{munix=95:unix95%O%s}} \
 284    %{static:crtbeginT%O%s} %{!static:%{!shared:crtbegin%O%s} \
 285    %{shared:crtbeginS%O%s}}"
 286 #endif
 287 #undef ENDFILE_SPEC
 288 #define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}"
 289
 290 /* Since HP uses the .init and .fini sections for array initializers
 291    and finalizers, we need different defines for INIT_SECTION_ASM_OP
 292    and FINI_SECTION_ASM_OP.  With the implementation adopted below,
 293    the sections are not actually used.  However, we still must provide
 294    defines to select the proper code path.  */
 295 #undef INIT_SECTION_ASM_OP
 296 #define INIT_SECTION_ASM_OP
 297 #undef FINI_SECTION_ASM_OP
 298 #define FINI_SECTION_ASM_OP
 299
 300 /* We are using array initializers and don't want calls in the INIT
 301    and FINI sections.  */
 302 #undef CRT_CALL_STATIC_FUNCTION
 303 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)
 304
 305 /* The init_priority attribute is not supported with HP ld.  This could be
 306    supported if collect2 was used with LD_INIT_SWITCH.  Unfortunately, this
 307    approach doesn't work with GNU ld since HP-UX doesn't support DT_INIT,
 308    and therefore the -init and -fini GNU ld switches.  */
 309 #undef SUPPORTS_INIT_PRIORITY
 310 #define SUPPORTS_INIT_PRIORITY (TARGET_GNU_LD ? 1 : 0)
 311
 312 /* We use DTOR_LIST_BEGIN to carry a bunch of hacks to allow us to use
 313    the init and fini array sections with both the HP and GNU linkers.
 314    The linkers setup the required dynamic entries in the dynamic segment
 315    and the dynamic linker does the calls.  This approach avoids using
 316    collect2.
 317
 318    The first hack is to implement __do_global_ctors_aux in crtbegin as
 319    it needs to be the first entry in the init array so that it is called
 320    last.  HP got the order of the init array backwards.  The DT_INIT_ARRAY
 321    is supposed to be executed in the same order as the addresses appear in
 322    the array.  DT_FINI_ARRAY is supposed to be executed in the opposite
 323    order.
 324
 325    The second hack is stubs for __cxa_finalize and _Jv_RegisterClasses.
 326    The HP implementation of undefined weak symbols is broken.  The linker
 327    and dynamic loader both search for undefined weak symbols contrary the
 328    generic System V ABI.  An undefined weak symbol should resolve to a
 329    value of 0 rather than causing an error.  The prototypes for
 330    __cxa_finalize and _Jv_RegisterClasses in crtstuff.c are weak when
 331    weak is supported (GNU as), so in theory a strong define should override
 332    the stub functions provided here.
 333
 334    The final hack is a set of plabels to implement the effect of
 335    CRT_CALL_STATIC_FUNCTION.  HP-UX 11 only supports DI_INIT_ARRAY and
 336    DT_FINI_ARRAY and they put the arrays in .init and .fini, rather than
 337    in .init_array and .fini_array.  The standard defines for .init and
 338    .fini have the execute flag set.  So, the assembler has to be hacked
 339    to munge the standard flags for these sections to make them agree
 340    with what the HP linker expects.  With the GNU linker, we need to
 341    used the .init_array and .fini_array sections.  So, we set up for
 342    both just in case.  Once we have built the table, the linker does
 343    the rest of the work.
 344
 345    The order is significant.  Placing __do_global_ctors_aux first in
 346    the list, results in it being called last.  User specified initializers,
 347    either using the linker +init command or a plabel, run before the
 348    initializers specified here.  */
 349
 350 /* We need a __cxa_finalize stub if CRTSTUFFS_O is defined.  */
 351 #ifdef CRTSTUFFS_O
 352 #define PA_CXA_FINALIZE_STUB \
 353 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;              \
 354 void                                                                    \
 355 __cxa_finalize (void *p __attribute__((unused))) {}
 356 #else
 357 #define PA_CXA_FINALIZE_STUB
 358 #endif
 359
 360 /* We need a _Jv_RegisterClasses stub if JCR_SECTION_NAME is defined.  */
 361 #ifdef JCR_SECTION_NAME
 362 #define PA_JV_REGISTERCLASSES_STUB \
 363 void                                                                    \
 364 _Jv_RegisterClasses (void *p __attribute__((unused))) {}
 365 #else
 366 #define PA_JV_REGISTERCLASSES_STUB
 367 #endif
 368
 369 /* We need to add frame_dummy to the initializer list if EH_FRAME_SECTION_NAME
 370    or JCR_SECTION_NAME is defined.  */
 371 #if defined(EH_FRAME_SECTION_NAME) || defined(JCR_SECTION_NAME)
 372 #define PA_INIT_FRAME_DUMMY_ASM_OP ".dword P%frame_dummy"
 373 #else
 374 #define PA_INIT_FRAME_DUMMY_ASM_OP ""
 375 #endif
 376
 377 #define PA_INIT_FINI_HACK \
 378 static void __attribute__((used))                                       \
 379 __do_global_ctors_aux (void)                                            \
 380 {                                                                       \
 381   func_ptr *p = __CTOR_LIST__;                                          \
 382   while (*(p + 1))                                                      \
 383     p++;                                                                \
 384   for (; *p != (func_ptr) -1; p--)                                      \
 385     (*p) ();                                                            \
 386 }                                                                       \
 387                                                                         \
 388 PA_CXA_FINALIZE_STUB                                                    \
 389 PA_JV_REGISTERCLASSES_STUB                                              \
 390                                                                         \
 391 asm (HP_INIT_ARRAY_SECTION_ASM_OP);                                     \
 392 asm (".dword P%__do_global_ctors_aux");                                 \
 393 asm (PA_INIT_FRAME_DUMMY_ASM_OP);                                       \
 394 asm (GNU_INIT_ARRAY_SECTION_ASM_OP);                                    \
 395 asm (".dword P%__do_global_ctors_aux");                                 \
 396 asm (PA_INIT_FRAME_DUMMY_ASM_OP);                                       \
 397 asm (HP_FINI_ARRAY_SECTION_ASM_OP);                                     \
 398 asm (".dword P%__do_global_dtors_aux");                                 \
 399 asm (GNU_FINI_ARRAY_SECTION_ASM_OP);                                    \
 400 asm (".dword P%__do_global_dtors_aux")
 401
 402 /* The following two variants of DTOR_LIST_BEGIN are identical to those
 403    in crtstuff.c except for the addition of the above init-fini hack.  */
 404 #ifdef DTORS_SECTION_ASM_OP
 405 #define DTOR_LIST_BEGIN \
 406 asm (DTORS_SECTION_ASM_OP);                                             \
 407 STATIC func_ptr __DTOR_LIST__[1]                                        \
 408   __attribute__ ((aligned(sizeof(func_ptr))))                           \
 409   = { (func_ptr) (-1) };                                                \
 410 PA_INIT_FINI_HACK
 411 #else
 412 #define DTOR_LIST_BEGIN \
 413 STATIC func_ptr __DTOR_LIST__[1]                                        \
 414   __attribute__ ((section(".dtors"), aligned(sizeof(func_ptr))))        \
 415   = { (func_ptr) (-1) };                                                \
 416 PA_INIT_FINI_HACK
 417 #endif
 418
 419 /* If using HP ld do not call pxdb.  Use size as a program that does nothing
 420    and returns 0.  /bin/true cannot be used because it is a script without
 421    an interpreter.  */
 422 #define INIT_ENVIRONMENT "LD_PXDB=/usr/ccs/bin/size"
 423
 424 /* The HPUX dynamic linker objects to weak symbols with no
 425    definitions, so do not use them in gthr-posix.h.  */
 426 #define GTHREAD_USE_WEAK 0