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
   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_alignment_string == 0)                         \
  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 #define MASK_PROFILE_KERNEL     0x00100000
 210
 211 /* Non-standard profiling for kernels, which just saves LR then calls
 212    _mcount without worrying about arg saves.  The idea is to change
 213    the function prologue as little as possible as it isn't easy to
 214    account for arg save/restore code added just for _mcount.  */
 215 #define TARGET_PROFILE_KERNEL   (target_flags & MASK_PROFILE_KERNEL)
 216
 217 /* Override sysv4.h.  */
 218 #undef  EXTRA_SUBTARGET_SWITCHES
 219 #define EXTRA_SUBTARGET_SWITCHES                                        \
 220   {"profile-kernel",     MASK_PROFILE_KERNEL,                           \
 221    N_("Call mcount for profiling before a function prologue") },        \
 222   {"no-profile-kernel", -MASK_PROFILE_KERNEL,                           \
 223    N_("Call mcount for profiling after a function prologue") },
 224
 225 /* We use glibc _mcount for profiling.  */
 226 #define NO_PROFILE_COUNTERS TARGET_64BIT
 227 #define PROFILE_HOOK(LABEL) \
 228   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
 229
 230 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
 231 #undef  ADJUST_FIELD_ALIGN
 232 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 233   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
 234    ? 128                                                                \
 235    : (TARGET_64BIT                                                      \
 236       && TARGET_ALIGN_NATURAL == 0                                      \
 237       && TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE         \
 238                     ? get_inner_array_type (FIELD)                      \
 239                     : TREE_TYPE (FIELD)) == DFmode)                     \
 240    ? MIN ((COMPUTED), 32)                                               \
 241    : (COMPUTED))
 242
 243 /* PowerPC64 Linux increases natural record alignment to doubleword if
 244    the first field is an FP double, only if in power alignment mode.  */
 245 #undef  ROUND_TYPE_ALIGN
 246 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
 247   ((TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE)                \
 248    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)                           \
 249    : (TARGET_64BIT                                                      \
 250       && (TREE_CODE (STRUCT) == RECORD_TYPE                             \
 251           || TREE_CODE (STRUCT) == UNION_TYPE                           \
 252           || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                     \
 253       && TARGET_ALIGN_NATURAL == 0)                                     \
 254    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
 255    : MAX ((COMPUTED), (SPECIFIED)))
 256
 257 /* Indicate that jump tables go in the text section.  */
 258 #undef  JUMP_TABLES_IN_TEXT_SECTION
 259 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
 260
 261 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
 262    than a doubleword should be padded upward or downward.  You could
 263    reasonably assume that they follow the normal rules for structure
 264    layout treating the parameter area as any other block of memory,
 265    then map the reg param area to registers.  i.e. pad upward.
 266    Setting both of the following defines results in this behavior.
 267    Setting just the first one will result in aggregates that fit in a
 268    doubleword being padded downward, and others being padded upward.
 269    Not a bad idea as this results in struct { int x; } being passed
 270    the same way as an int.  */
 271 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
 272 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
 273
 274 /* Specify padding for the last element of a block move between
 275    registers and memory.  FIRST is nonzero if this is the only
 276    element.  */
 277 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
 278   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
 279
 280 /* __throw will restore its own return address to be the same as the
 281    return address of the function that the throw is being made to.
 282    This is unfortunate, because we want to check the original
 283    return address to see if we need to restore the TOC.
 284    So we have to squirrel it away with this.  */
 285 #define SETUP_FRAME_ADDRESSES() \
 286   do { if (TARGET_64BIT) rs6000_aix_emit_builtin_unwind_init (); } while (0)
 287
 288 /* Override svr4.h  */
 289 #undef MD_EXEC_PREFIX
 290 #undef MD_STARTFILE_PREFIX
 291
 292 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
 293    process.  */
 294 #define OS_MISSING_POWERPC64 !TARGET_64BIT
 295
 296 /* glibc has float and long double forms of math functions.  */
 297 #undef  TARGET_C99_FUNCTIONS
 298 #define TARGET_C99_FUNCTIONS 1
 299
 300 #undef  TARGET_OS_CPP_BUILTINS
 301 #define TARGET_OS_CPP_BUILTINS()                        \
 302   do                                                    \
 303     {                                                   \
 304       if (TARGET_64BIT)                                 \
 305         {                                               \
 306           builtin_define ("__PPC__");                   \
 307           builtin_define ("__PPC64__");                 \
 308           builtin_define ("__powerpc__");               \
 309           builtin_define ("__powerpc64__");             \
 310           builtin_define ("__PIC__");                   \
 311           builtin_assert ("cpu=powerpc64");             \
 312           builtin_assert ("machine=powerpc64");         \
 313         }                                               \
 314       else                                              \
 315         {                                               \
 316           builtin_define_std ("PPC");                   \
 317           builtin_define_std ("powerpc");               \
 318           builtin_assert ("cpu=powerpc");               \
 319           builtin_assert ("machine=powerpc");           \
 320           TARGET_OS_SYSV_CPP_BUILTINS ();               \
 321         }                                               \
 322     }                                                   \
 323   while (0)
 324
 325 #undef  CPP_OS_DEFAULT_SPEC
 326 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 327
 328 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 329    defined on glibc-based systems. This temporary hack accomplishes this,
 330    it should go away as soon as libstdc++-v3 has a real fix.  */
 331 #undef  CPLUSPLUS_CPP_SPEC
 332 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 333
 334 #undef  LINK_SHLIB_SPEC
 335 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 336
 337 #undef  LIB_DEFAULT_SPEC
 338 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 339
 340 #undef  STARTFILE_DEFAULT_SPEC
 341 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 342
 343 #undef  ENDFILE_DEFAULT_SPEC
 344 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 345
 346 #undef  LINK_START_DEFAULT_SPEC
 347 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 348
 349 #undef  LINK_OS_DEFAULT_SPEC
 350 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 351
 352 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
 353   %{rdynamic:-export-dynamic} \
 354   %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}}}"
 355
 356 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
 357   %{rdynamic:-export-dynamic} \
 358   %{!dynamic-linker:-dynamic-linker /lib64/ld64.so.1}}}"
 359
 360 #undef  TOC_SECTION_ASM_OP
 361 #define TOC_SECTION_ASM_OP \
 362   (TARGET_64BIT                                         \
 363    ? "\t.section\t\".toc\",\"aw\""                      \
 364    : "\t.section\t\".got\",\"aw\"")
 365
 366 #undef  MINIMAL_TOC_SECTION_ASM_OP
 367 #define MINIMAL_TOC_SECTION_ASM_OP \
 368   (TARGET_64BIT                                         \
 369    ? "\t.section\t\".toc1\",\"aw\""                     \
 370    : ((TARGET_RELOCATABLE || flag_pic)                  \
 371       ? "\t.section\t\".got2\",\"aw\""                  \
 372       : "\t.section\t\".got1\",\"aw\""))
 373
 374 #undef  TARGET_VERSION
 375 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 376
 377 /* Must be at least as big as our pointer type.  */
 378 #undef  SIZE_TYPE
 379 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
 380
 381 #undef  PTRDIFF_TYPE
 382 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
 383
 384 #undef  WCHAR_TYPE
 385 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
 386 #undef  WCHAR_TYPE_SIZE
 387 #define WCHAR_TYPE_SIZE 32
 388
 389 /* Override rs6000.h definition.  */
 390 #undef  ASM_APP_ON
 391 #define ASM_APP_ON "#APP\n"
 392
 393 /* Override rs6000.h definition.  */
 394 #undef  ASM_APP_OFF
 395 #define ASM_APP_OFF "#NO_APP\n"
 396
 397 /* PowerPC no-op instruction.  */
 398 #undef  RS6000_CALL_GLUE
 399 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
 400
 401 #undef  RS6000_MCOUNT
 402 #define RS6000_MCOUNT "_mcount"
 403
 404 #ifdef __powerpc64__
 405 /* _init and _fini functions are built from bits spread across many
 406    object files, each potentially with a different TOC pointer.  For
 407    that reason, place a nop after the call so that the linker can
 408    restore the TOC pointer if a TOC adjusting call stub is needed.  */
 409 #if DOT_SYMBOLS
 410 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 411   asm (SECTION_OP "\n"                                  \
 412 "       bl ." #FUNC "\n"                                \
 413 "       nop\n"                                          \
 414 "       .previous");
 415 #else
 416 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
 417   asm (SECTION_OP "\n"                                  \
 418 "       bl " #FUNC "\n"                                 \
 419 "       nop\n"                                          \
 420 "       .previous");
 421 #endif
 422 #endif
 423
 424 /* FP save and restore routines.  */
 425 #undef  SAVE_FP_PREFIX
 426 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
 427 #undef  SAVE_FP_SUFFIX
 428 #define SAVE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 429 #undef  RESTORE_FP_PREFIX
 430 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
 431 #undef  RESTORE_FP_SUFFIX
 432 #define RESTORE_FP_SUFFIX (TARGET_64BIT ? "" : "_l")
 433
 434 /* Dwarf2 debugging.  */
 435 #undef  PREFERRED_DEBUGGING_TYPE
 436 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 437
 438 /* This is how to declare the size of a function.  */
 439 #undef  ASM_DECLARE_FUNCTION_SIZE
 440 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 441   do                                                                    \
 442     {                                                                   \
 443       if (!flag_inhibit_size_directive)                                 \
 444         {                                                               \
 445           fputs ("\t.size\t", (FILE));                                  \
 446           if (TARGET_64BIT && DOT_SYMBOLS)                              \
 447             putc ('.', (FILE));                                         \
 448           assemble_name ((FILE), (FNAME));                              \
 449           fputs (",.-", (FILE));                                        \
 450           rs6000_output_function_entry (FILE, FNAME);                   \
 451           putc ('\n', (FILE));                                          \
 452         }                                                               \
 453     }                                                                   \
 454   while (0)
 455
 456 /* Return nonzero if this entry is to be written into the constant
 457    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 458    or a CONST containing one of them.  If -mfp-in-toc (the default),
 459    we also do this for floating-point constants.  We actually can only
 460    do this if the FP formats of the target and host machines are the
 461    same, but we can't check that since not every file that uses
 462    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
 463    we can write the entry into the TOC and the entry is not larger
 464    than a TOC entry.  */
 465
 466 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 467 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 468   (TARGET_TOC                                                           \
 469    && (GET_CODE (X) == SYMBOL_REF                                       \
 470        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 471            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 472        || GET_CODE (X) == LABEL_REF                                     \
 473        || (GET_CODE (X) == CONST_INT                                    \
 474            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 475        || (GET_CODE (X) == CONST_DOUBLE                                 \
 476            && ((TARGET_64BIT                                            \
 477                 && (TARGET_POWERPC64                                    \
 478                     || TARGET_MINIMAL_TOC                               \
 479                     || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT     \
 480                         && ! TARGET_NO_FP_IN_TOC)))                     \
 481                || (!TARGET_64BIT                                        \
 482                    && !TARGET_NO_FP_IN_TOC                              \
 483                    && !TARGET_RELOCATABLE                               \
 484                    && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT       \
 485                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
 486
 487 /* This ABI cannot use DBX_LINES_FUNCTION_RELATIVE, nor can it use
 488    dbxout_stab_value_internal_label_diff, because we must
 489    use the function code label, not the function descriptor label.  */
 490 #define DBX_OUTPUT_SOURCE_LINE(FILE, LINE, COUNTER)                     \
 491 do                                                                      \
 492   {                                                                     \
 493     char temp[256];                                                     \
 494     const char *s;                                                      \
 495     ASM_GENERATE_INTERNAL_LABEL (temp, "LM", COUNTER);                  \
 496     dbxout_begin_stabn_sline (LINE);                                    \
 497     assemble_name (FILE, temp);                                         \
 498     putc ('-', FILE);                                                   \
 499     s = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);           \
 500     rs6000_output_function_entry (FILE, s);                             \
 501     putc ('\n', FILE);                                                  \
 502     targetm.asm_out.internal_label (FILE, "LM", COUNTER);               \
 503     COUNTER += 1;                                                       \
 504   }                                                                     \
 505 while (0)
 506
 507 /* Similarly, we want the function code label here.  Cannot use
 508    dbxout_stab_value_label_diff, as we have to use
 509    rs6000_output_function_entry.  FIXME.  */
 510 #define DBX_OUTPUT_BRAC(FILE, NAME, BRAC)                               \
 511   do                                                                    \
 512     {                                                                   \
 513       const char *s;                                                    \
 514       dbxout_begin_stabn (BRAC);                                        \
 515       assemble_name (FILE, NAME);                                       \
 516       putc ('-', FILE);                                                 \
 517       s = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);         \
 518       rs6000_output_function_entry (FILE, s);                           \
 519       putc ('\n', FILE);                                                \
 520     }                                                                   \
 521   while (0)
 522
 523 #define DBX_OUTPUT_LBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_LBRAC)
 524 #define DBX_OUTPUT_RBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_RBRAC)
 525
 526 /* Another case where we want the dot name.  */
 527 #define DBX_OUTPUT_NFUN(FILE, LSCOPE, DECL)                             \
 528   do                                                                    \
 529     {                                                                   \
 530       const char *s;                                                    \
 531       dbxout_begin_empty_stabs (N_FUN);                                 \
 532       assemble_name (FILE, LSCOPE);                                     \
 533       putc ('-', FILE);                                                 \
 534       s = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);         \
 535       rs6000_output_function_entry (FILE, s);                           \
 536       putc ('\n', FILE);                                                \
 537     }                                                                   \
 538   while (0)
 539
 540 /* Select a format to encode pointers in exception handling data.  CODE
 541    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 542    true if the symbol may be affected by dynamic relocations.  */
 543 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 544 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 545   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
 546    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
 547       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
 548    : DW_EH_PE_absptr)
 549
 550 /* For backward compatibility, we must continue to use the AIX
 551    structure return convention.  */
 552 #undef DRAFT_V4_STRUCT_RET
 553 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
 554
 555 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
 556
 557 #define TARGET_HAS_F_SETLKW
 558
 559 #define LINK_GCC_C_SEQUENCE_SPEC \
 560   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
 561
 562 /* Use --as-needed -lgcc_s for eh support.  */
 563 #ifdef HAVE_LD_AS_NEEDED
 564 #define USE_LD_AS_NEEDED 1
 565 #endif
 566
 567 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"