gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit PowerPC linux.
   3    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005
   4    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 2, 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 COPYING.  If not, write to the
  20    Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  21    MA 02111-1307, USA.  */
  22
  23 #ifndef RS6000_BI_ARCH
  24
  25 #undef  DEFAULT_ABI
  26 #define DEFAULT_ABI ABI_AIX
  27
  28 #undef  TARGET_64BIT
  29 #define TARGET_64BIT 1
  30
  31 #define DEFAULT_ARCH64_P 1
  32 #define RS6000_BI_ARCH_P 0
  33
  34 #else
  35
  36 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
  37 #define RS6000_BI_ARCH_P 1
  38
  39 #endif
  40
  41 #ifdef IN_LIBGCC2
  42 #undef TARGET_64BIT
  43 #ifdef __powerpc64__
  44 #define TARGET_64BIT 1
  45 #else
  46 #define TARGET_64BIT 0
  47 #endif
  48 #endif
  49
  50 #undef  TARGET_AIX
  51 #define TARGET_AIX TARGET_64BIT
  52
  53 #ifdef HAVE_LD_NO_DOT_SYMS
  54 /* New ABI uses a local sym for the function entry point.  */
  55 extern int dot_symbols;
  56 #undef DOT_SYMBOLS
  57 #define DOT_SYMBOLS dot_symbols
  58 #endif
  59
  60 #undef  PROCESSOR_DEFAULT
  61 #define PROCESSOR_DEFAULT PROCESSOR_POWER4
  62 #undef  PROCESSOR_DEFAULT64
  63 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
  64
  65 /* We don't need to generate entries in .fixup, except when
  66    -mrelocatable or -mrelocatable-lib is given.  */
  67 #undef RELOCATABLE_NEEDS_FIXUP
  68 #define RELOCATABLE_NEEDS_FIXUP \
  69   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
  70
  71 #undef  RS6000_ABI_NAME
  72 #define RS6000_ABI_NAME "linux"
  73
  74 #define INVALID_64BIT "-m%s not supported in this configuration"
  75 #define INVALID_32BIT INVALID_64BIT
  76
  77 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
  78 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
  79   do                                                            \
  80     {                                                           \
  81       if (!rs6000_explicit_options.alignment)                   \
  82         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
  83       if (TARGET_64BIT)                                         \
  84         {                                                       \
  85           if (DEFAULT_ABI != ABI_AIX)                           \
  86             {                                                   \
  87               rs6000_current_abi = ABI_AIX;                     \
  88               error (INVALID_64BIT, "call");                    \
  89             }                                                   \
  90           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
  91           if (target_flags & MASK_RELOCATABLE)                  \
  92             {                                                   \
  93               target_flags &= ~MASK_RELOCATABLE;                \
  94               error (INVALID_64BIT, "relocatable");             \
  95             }                                                   \
  96           if (target_flags & MASK_EABI)                         \
  97             {                                                   \
  98               target_flags &= ~MASK_EABI;                       \
  99               error (INVALID_64BIT, "eabi");                    \
 100             }                                                   \
 101           if (target_flags & MASK_PROTOTYPE)                    \
 102             {                                                   \
 103               target_flags &= ~MASK_PROTOTYPE;                  \
 104               error (INVALID_64BIT, "prototype");               \
 105             }                                                   \
 106           if ((target_flags & MASK_POWERPC64) == 0)             \
 107             {                                                   \
 108               target_flags |= MASK_POWERPC64;                   \
 109               error ("-m64 requires a PowerPC64 cpu");          \
 110             }                                                   \
 111         }                                                       \
 112       else                                                      \
 113         {                                                       \
 114           if (!RS6000_BI_ARCH_P)                                \
 115             error (INVALID_32BIT, "32");                        \
 116           if (TARGET_PROFILE_KERNEL)                            \
 117             {                                                   \
 118               target_flags &= ~MASK_PROFILE_KERNEL;             \
 119               error (INVALID_32BIT, "profile-kernel");          \
 120             }                                                   \
 121         }                                                       \
 122     }                                                           \
 123   while (0)
 124
 125 #ifdef  RS6000_BI_ARCH
 126
 127 #undef  OVERRIDE_OPTIONS
 128 #define OVERRIDE_OPTIONS \
 129   rs6000_override_options (((TARGET_DEFAULT ^ target_flags) & MASK_64BIT) \
 130                            ? (char *) 0 : TARGET_CPU_DEFAULT)
 131
 132 #endif
 133
 134 #undef  ASM_DEFAULT_SPEC
 135 #undef  ASM_SPEC
 136 #undef  LINK_OS_LINUX_SPEC
 137
 138 #ifndef RS6000_BI_ARCH
 139 #define ASM_DEFAULT_SPEC "-mppc64"
 140 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
 141 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
 142 #else
 143 #if DEFAULT_ARCH64_P
 144 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
 145 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
 146 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
 147 #else
 148 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
 149 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 150 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
 151 #endif
 152 #endif
 153
 154 #define ASM_SPEC32 "-a32 %{n} %{T} %{Ym,*} %{Yd,*} \
 155 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
 156 %{memb} %{!memb: %{msdata: -memb} %{msdata=eabi: -memb}} \
 157 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
 158     %{mcall-freebsd: -mbig} \
 159     %{mcall-i960-old: -mlittle} \
 160     %{mcall-linux: -mbig} \
 161     %{mcall-gnu: -mbig} \
 162     %{mcall-netbsd: -mbig} \
 163 }}}}"
 164
 165 #define ASM_SPEC64 "-a64"
 166
 167 #define ASM_SPEC_COMMON "%(asm_cpu) \
 168 %{.s: %{mregnames} %{mno-regnames}} %{.S: %{mregnames} %{mno-regnames}} \
 169 %{v:-V} %{Qy:} %{!Qn:-Qy} %{Wa,*:%*} \
 170 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
 171
 172 #undef  SUBSUBTARGET_EXTRA_SPECS
 173 #define SUBSUBTARGET_EXTRA_SPECS \
 174   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
 175   { "asm_spec32",               ASM_SPEC32 },                           \
 176   { "asm_spec64",               ASM_SPEC64 },                           \
 177   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
 178   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
 179
 180 #undef  MULTILIB_DEFAULTS
 181 #if DEFAULT_ARCH64_P
 182 #define MULTILIB_DEFAULTS { "m64" }
 183 #else
 184 #define MULTILIB_DEFAULTS { "m32" }
 185 #endif
 186
 187 #ifndef RS6000_BI_ARCH
 188
 189 /* 64-bit PowerPC Linux is always big-endian.  */
 190 #undef  TARGET_LITTLE_ENDIAN
 191 #define TARGET_LITTLE_ENDIAN    0
 192
 193 /* 64-bit PowerPC Linux always has a TOC.  */
 194 #undef  TARGET_TOC
 195 #define TARGET_TOC              1
 196
 197 /* Some things from sysv4.h we don't do when 64 bit.  */
 198 #undef  TARGET_RELOCATABLE
 199 #define TARGET_RELOCATABLE      0
 200 #undef  TARGET_EABI
 201 #define TARGET_EABI             0
 202 #undef  TARGET_PROTOTYPE
 203 #define TARGET_PROTOTYPE        0
 204 #undef RELOCATABLE_NEEDS_FIXUP
 205 #define RELOCATABLE_NEEDS_FIXUP 0
 206
 207 #endif
 208
 209 /* We use glibc _mcount for profiling.  */
 210 #define NO_PROFILE_COUNTERS 1
 211 #define PROFILE_HOOK(LABEL) \
 212   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 213
 214 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 215 #undef  ADJUST_FIELD_ALIGN
 216 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 217   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 218    ? 128                                                                \
 219    : (TARGET_64BIT                                                      \
 220       && TARGET_ALIGN_NATURAL == 0                                      \
 221       && TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE         \
 222                     ? get_inner_array_type (FIELD)                      \
 223                     : TREE_TYPE (FIELD)) == DFmode)                     \
 224    ? MIN ((COMPUTED), 32)                                               \
 225    : (COMPUTED))
 226
 227 /* PowerPC64 Linux increases natural record alignment to doubleword if
 228    the first field is an FP double, only if in power alignment mode.  */
 229 #undef  ROUND_TYPE_ALIGN
 230 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 231   ((TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE)                \
 232    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                           \
 233    : (TARGET_64BIT                                                      \
 234       && (TREE_CODE (STRUCT) == RECORD_TYPE                             \
 235           || TREE_CODE (STRUCT) == UNION_TYPE                           \
 236           || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                     \
 237       && TARGET_ALIGN_NATURAL == 0)                                     \
 238    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 239    : MAX ((COMPUTED), (SPECIFIED)))
 240
 241 /* Indicate that jump tables go in the text section.  */
 242 #undef  JUMP_TABLES_IN_TEXT_SECTION
 243 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 244
 245 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 246    than a doubleword should be padded upward or downward.  You could
 247    reasonably assume that they follow the normal rules for structure
 248    layout treating the parameter area as any other block of memory,
 249    then map the reg param area to registers.  i.e. pad upward.
 250    Setting both of the following defines results in this behavior.
 251    Setting just the first one will result in aggregates that fit in a
 252    doubleword being padded downward, and others being padded upward.
 253    Not a bad idea as this results in struct { int x; } being passed
 254    the same way as an int.  */
 255 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 256 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 257
 258 /* Specify padding for the last element of a block move between
 259    registers and memory.  FIRST is nonzero if this is the only
 260    element.  */
 261 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 262   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 263
 264 /* __throw will restore its own return address to be the same as the
 265    return address of the function that the throw is being made to.
 266    This is unfortunate, because we want to check the original
 267    return address to see if we need to restore the TOC.
 268    So we have to squirrel it away with this.  */
 269 #define SETUP_FRAME_ADDRESSES() \
 270   do { if (TARGET_64BIT) rs6000_aix_emit_builtin_unwind_init (); } while (0)
 271
 272 /* Override svr4.h  */
 273 #undef MD_EXEC_PREFIX
 274 #undef MD_STARTFILE_PREFIX
 275
 276 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 277    process.  */
 278 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 279
 280 /* glibc has float and long double forms of math functions.  */
 281 #undef  TARGET_C99_FUNCTIONS
 282 #define TARGET_C99_FUNCTIONS 1
 283
 284 #undef  TARGET_OS_CPP_BUILTINS
 285 #define TARGET_OS_CPP_BUILTINS()                        \
 286   do                                                    \
 287     {                                                   \
 288       if (TARGET_64BIT)                                 \
 289         {                                               \
 290           builtin_define ("__PPC__");                   \
 291           builtin_define ("__PPC64__");                 \
 292           builtin_define ("__powerpc__");               \
 293           builtin_define ("__powerpc64__");             \
 294           builtin_define ("__PIC__");                   \
 295           builtin_assert ("cpu=powerpc64");             \
 296           builtin_assert ("machine=powerpc64");         \
 297         }                                               \
 298       else                                              \
 299         {                                               \
 300           builtin_define_std ("PPC");                   \
 301           builtin_define_std ("powerpc");               \
 302           builtin_assert ("cpu=powerpc");               \
 303           builtin_assert ("machine=powerpc");           \
 304           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 305         }                                               \
 306     }                                                   \
 307   while (0)
 308
 309 #undef  CPP_OS_DEFAULT_SPEC
 310 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 311
 312 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 313    defined on glibc-based systems. This temporary hack accomplishes this,
 314    it should go away as soon as libstdc++-v3 has a real fix.  */
 315 #undef  CPLUSPLUS_CPP_SPEC
 316 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 317
 318 #undef  LINK_SHLIB_SPEC
 319 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 320
 321 #undef  LIB_DEFAULT_SPEC
 322 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 323
 324 #undef  STARTFILE_DEFAULT_SPEC
 325 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 326
 327 #undef  ENDFILE_DEFAULT_SPEC
 328 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 329
 330 #undef  LINK_START_DEFAULT_SPEC
 331 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 332
 333 #undef  LINK_OS_DEFAULT_SPEC
 334 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 335
 336 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 337   %{rdynamic:-export-dynamic} \
 338   %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}}}"
 339
 340 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 341   %{rdynamic:-export-dynamic} \
 342   %{!dynamic-linker:-dynamic-linker /lib64/ld64.so.1}}}"
 343
 344 #undef  TOC_SECTION_ASM_OP
 345 #define TOC_SECTION_ASM_OP \
 346   (TARGET_64BIT                                         \
 347    ? "\t.section\t\".toc\",\"aw\""                      \
 348    : "\t.section\t\".got\",\"aw\"")
 349
 350 #undef  MINIMAL_TOC_SECTION_ASM_OP
 351 #define MINIMAL_TOC_SECTION_ASM_OP \
 352   (TARGET_64BIT                                         \
 353    ? "\t.section\t\".toc1\",\"aw\""                     \
 354    : ((TARGET_RELOCATABLE || flag_pic)                  \
 355       ? "\t.section\t\".got2\",\"aw\""                  \
 356       : "\t.section\t\".got1\",\"aw\""))
 357
 358 #undef  TARGET_VERSION
 359 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 360
 361 /* Must be at least as big as our pointer type.  */
 362 #undef  SIZE_TYPE
 363 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 364
 365 #undef  PTRDIFF_TYPE
 366 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 367
 368 #undef  WCHAR_TYPE
 369 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 370 #undef  WCHAR_TYPE_SIZE
 371 #define WCHAR_TYPE_SIZE 32
 372
 373 /* Override rs6000.h definition.  */
 374 #undef  ASM_APP_ON
 375 #define ASM_APP_ON "#APP\n"
 376
 377 /* Override rs6000.h definition.  */
 378 #undef  ASM_APP_OFF
 379 #define ASM_APP_OFF "#NO_APP\n"
 380
 381 /* PowerPC no-op instruction.  */
 382 #undef  RS6000_CALL_GLUE
 383 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
 384
 385 #undef  RS6000_MCOUNT
 386 #define RS6000_MCOUNT "_mcount"
 387
 388 #ifdef __powerpc64__
 389 /* _init and _fini functions are built from bits spread across many
 390    object files, each potentially with a different TOC pointer.  For
 391    that reason, place a nop after the call so that the linker can
 392    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 393 #if DOT_SYMBOLS
 394 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 395   asm (SECTION_OP "\n"                                  \
 396 "       bl ." #FUNC "\n"                                \
 397 "       nop\n"                                          \
 398 "       .previous");
 399 #else
 400 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 401   asm (SECTION_OP "\n"                                  \
 402 "       bl " #FUNC "\n"                                 \
 403 "       nop\n"                                          \
 404 "       .previous");
 405 #endif
 406 #endif
 407
 408 /* FP save and restore routines.  */
 409 #undef  SAVE_FP_PREFIX
 410 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 411 #undef  SAVE_FP_SUFFIX
 412 #define SAVE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 413 #undef  RESTORE_FP_PREFIX
 414 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 415 #undef  RESTORE_FP_SUFFIX
 416 #define RESTORE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 417
 418 /* Dwarf2 debugging.  */
 419 #undef  PREFERRED_DEBUGGING_TYPE
 420 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 421
 422 /* This is how to declare the size of a function.  */
 423 #undef  ASM_DECLARE_FUNCTION_SIZE
 424 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 425   do                                                                    \
 426     {                                                                   \
 427       if (!flag_inhibit_size_directive)                                 \
 428         {                                                               \
 429           fputs ("\t.size\t", (FILE));                                  \
 430           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 431             putc ('.', (FILE));                                         \
 432           assemble_name ((FILE), (FNAME));                              \
 433           fputs (",.-", (FILE));                                        \
 434           rs6000_output_function_entry (FILE, FNAME);                   \
 435           putc ('\n', (FILE));                                          \
 436         }                                                               \
 437     }                                                                   \
 438   while (0)
 439
 440 /* Return nonzero if this entry is to be written into the constant
 441    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 442    or a CONST containing one of them.  If -mfp-in-toc (the default),
 443    we also do this for floating-point constants.  We actually can only
 444    do this if the FP formats of the target and host machines are the
 445    same, but we can't check that since not every file that uses
 446    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
 447    we can write the entry into the TOC and the entry is not larger
 448    than a TOC entry.  */
 449
 450 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 451 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 452   (TARGET_TOC                                                           \
 453    && (GET_CODE (X) == SYMBOL_REF                                       \
 454        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 455            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 456        || GET_CODE (X) == LABEL_REF                                     \
 457        || (GET_CODE (X) == CONST_INT                                    \
 458            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 459        || (GET_CODE (X) == CONST_DOUBLE                                 \
 460            && ((TARGET_64BIT                                            \
 461                 && (TARGET_POWERPC64                                    \
 462                     || TARGET_MINIMAL_TOC                               \
 463                     || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT     \
 464                         && ! TARGET_NO_FP_IN_TOC)))                     \
 465                || (!TARGET_64BIT                                        \
 466                    && !TARGET_NO_FP_IN_TOC                              \
 467                    && !TARGET_RELOCATABLE                               \
 468                    && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT       \
 469                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 470
 471 /* This ABI cannot use DBX_LINES_FUNCTION_RELATIVE, nor can it use
 472    dbxout_stab_value_internal_label_diff, because we must
 473    use the function code label, not the function descriptor label.  */
 474 #define DBX_OUTPUT_SOURCE_LINE(FILE, LINE, COUNTER)                     \
 475 do                                                                      \
 476   {                                                                     \
 477     char temp[256];                                                     \
 478     const char *s;                                                      \
 479     ASM_GENERATE_INTERNAL_LABEL (temp, "LM", COUNTER);                  \
 480     dbxout_begin_stabn_sline (LINE);                                    \
 481     assemble_name (FILE, temp);                                         \
 482     putc ('-', FILE);                                                   \
 483     s = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);           \
 484     rs6000_output_function_entry (FILE, s);                             \
 485     putc ('\n', FILE);                                                  \
 486     targetm.asm_out.internal_label (FILE, "LM", COUNTER);               \
 487     COUNTER += 1;                                                       \
 488   }                                                                     \
 489 while (0)
 490
 491 /* Similarly, we want the function code label here.  Cannot use
 492    dbxout_stab_value_label_diff, as we have to use
 493    rs6000_output_function_entry.  FIXME.  */
 494 #define DBX_OUTPUT_BRAC(FILE, NAME, BRAC)                               \
 495   do                                                                    \
 496     {                                                                   \
 497       const char *s;                                                    \
 498       dbxout_begin_stabn (BRAC);                                        \
 499       assemble_name (FILE, NAME);                                       \
 500       putc ('-', FILE);                                                 \
 501       s = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);         \
 502       rs6000_output_function_entry (FILE, s);                           \
 503       putc ('\n', FILE);                                                \
 504     }                                                                   \
 505   while (0)
 506
 507 #define DBX_OUTPUT_LBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_LBRAC)
 508 #define DBX_OUTPUT_RBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_RBRAC)
 509
 510 /* Another case where we want the dot name.  */
 511 #define DBX_OUTPUT_NFUN(FILE, LSCOPE, DECL)                             \
 512   do                                                                    \
 513     {                                                                   \
 514       const char *s;                                                    \
 515       dbxout_begin_empty_stabs (N_FUN);                                 \
 516       assemble_name (FILE, LSCOPE);                                     \
 517       putc ('-', FILE);                                                 \
 518       s = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);         \
 519       rs6000_output_function_entry (FILE, s);                           \
 520       putc ('\n', FILE);                                                \
 521     }                                                                   \
 522   while (0)
 523
 524 /* Select a format to encode pointers in exception handling data.  CODE
 525    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 526    true if the symbol may be affected by dynamic relocations.  */
 527 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 528 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 529   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 530    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 531       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 532    : DW_EH_PE_absptr)
 533
 534 /* For backward compatibility, we must continue to use the AIX
 535    structure return convention.  */
 536 #undef DRAFT_V4_STRUCT_RET
 537 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 538
 539 #define TARGET_ASM_FILE_END rs6000_elf_end_indicate_exec_stack
 540
 541 #define TARGET_HAS_F_SETLKW
 542
 543 #define LINK_GCC_C_SEQUENCE_SPEC \
 544   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 545
 546 /* Use --as-needed -lgcc_s for eh support.  */
 547 #ifdef HAVE_LD_AS_NEEDED
 548 #define USE_LD_AS_NEEDED 1
 549 #endif
 550
 551 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"