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* config/alpha/linux.h (OPTION_GLIBC): Define differently if
[pf3gnuchains/gcc-fork.git] / 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, 2006, 2007, 2008,
4    2009, 2010  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 3, 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    Under Section 7 of GPL version 3, you are granted additional
19    permissions described in the GCC Runtime Library Exception, version
20    3.1, as published by the Free Software Foundation.
21
22    You should have received a copy of the GNU General Public License and
23    a copy of the GCC Runtime Library Exception along with this program;
24    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
25    <http://www.gnu.org/licenses/>.  */
26
27 #ifndef RS6000_BI_ARCH
28
29 #undef  DEFAULT_ABI
30 #define DEFAULT_ABI ABI_AIX
31
32 #undef  TARGET_64BIT
33 #define TARGET_64BIT 1
34
35 #define DEFAULT_ARCH64_P 1
36 #define RS6000_BI_ARCH_P 0
37
38 #else
39
40 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
41 #define RS6000_BI_ARCH_P 1
42
43 #endif
44
45 #ifdef IN_LIBGCC2
46 #undef TARGET_64BIT
47 #ifdef __powerpc64__
48 #define TARGET_64BIT 1
49 #else
50 #define TARGET_64BIT 0
51 #endif
52 #endif
53
54 #undef  TARGET_AIX
55 #define TARGET_AIX TARGET_64BIT
56
57 #ifdef HAVE_LD_NO_DOT_SYMS
58 /* New ABI uses a local sym for the function entry point.  */
59 extern int dot_symbols;
60 #undef DOT_SYMBOLS
61 #define DOT_SYMBOLS dot_symbols
62 #endif
63
64 #define TARGET_PROFILE_KERNEL profile_kernel
65
66 #define TARGET_USES_LINUX64_OPT 1
67 #ifdef HAVE_LD_LARGE_TOC
68 #undef TARGET_CMODEL
69 #define TARGET_CMODEL rs6000_current_cmodel
70 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
71 #else
72 #define SET_CMODEL(opt) do {} while (0)
73 #endif
74
75 #undef  PROCESSOR_DEFAULT
76 #define PROCESSOR_DEFAULT PROCESSOR_POWER6
77 #undef  PROCESSOR_DEFAULT64
78 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER6
79
80 /* We don't need to generate entries in .fixup, except when
81    -mrelocatable or -mrelocatable-lib is given.  */
82 #undef RELOCATABLE_NEEDS_FIXUP
83 #define RELOCATABLE_NEEDS_FIXUP \
84   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
85
86 #undef  RS6000_ABI_NAME
87 #define RS6000_ABI_NAME "linux"
88
89 #define INVALID_64BIT "-m%s not supported in this configuration"
90 #define INVALID_32BIT INVALID_64BIT
91
92 #undef  SUBSUBTARGET_OVERRIDE_OPTIONS
93 #define SUBSUBTARGET_OVERRIDE_OPTIONS                           \
94   do                                                            \
95     {                                                           \
96       if (!rs6000_explicit_options.alignment)                   \
97         rs6000_alignment_flags = MASK_ALIGN_NATURAL;            \
98       if (TARGET_64BIT)                                         \
99         {                                                       \
100           if (DEFAULT_ABI != ABI_AIX)                           \
101             {                                                   \
102               rs6000_current_abi = ABI_AIX;                     \
103               error (INVALID_64BIT, "call");                    \
104             }                                                   \
105           dot_symbols = !strcmp (rs6000_abi_name, "aixdesc");   \
106           if (target_flags & MASK_RELOCATABLE)                  \
107             {                                                   \
108               target_flags &= ~MASK_RELOCATABLE;                \
109               error (INVALID_64BIT, "relocatable");             \
110             }                                                   \
111           if (target_flags & MASK_EABI)                         \
112             {                                                   \
113               target_flags &= ~MASK_EABI;                       \
114               error (INVALID_64BIT, "eabi");                    \
115             }                                                   \
116           if (TARGET_PROTOTYPE)                                 \
117             {                                                   \
118               target_prototype = 0;                             \
119               error (INVALID_64BIT, "prototype");               \
120             }                                                   \
121           if ((target_flags & MASK_POWERPC64) == 0)             \
122             {                                                   \
123               target_flags |= MASK_POWERPC64;                   \
124               error ("-m64 requires a PowerPC64 cpu");          \
125             }                                                   \
126           if ((target_flags_explicit & MASK_MINIMAL_TOC) != 0)  \
127             {                                                   \
128               if (rs6000_explicit_options.cmodel                \
129                   && rs6000_current_cmodel != CMODEL_SMALL)     \
130                 error ("-mcmodel incompatible with other toc options"); \
131               SET_CMODEL (CMODEL_SMALL);                        \
132             }                                                   \
133           else                                                  \
134             {                                                   \
135               if (!rs6000_explicit_options.cmodel)              \
136                 SET_CMODEL (CMODEL_MEDIUM);                     \
137               if (rs6000_current_cmodel != CMODEL_SMALL)        \
138                 {                                               \
139                   TARGET_NO_FP_IN_TOC = 0;                      \
140                   TARGET_NO_SUM_IN_TOC = 0;                     \
141                 }                                               \
142             }                                                   \
143         }                                                       \
144       else                                                      \
145         {                                                       \
146           if (!RS6000_BI_ARCH_P)                                \
147             error (INVALID_32BIT, "32");                        \
148           if (TARGET_PROFILE_KERNEL)                            \
149             {                                                   \
150               TARGET_PROFILE_KERNEL = 0;                        \
151               error (INVALID_32BIT, "profile-kernel");          \
152             }                                                   \
153           if (rs6000_explicit_options.cmodel)                   \
154             {                                                   \
155               SET_CMODEL (CMODEL_SMALL);                        \
156               error (INVALID_32BIT, "cmodel");                  \
157             }                                                   \
158         }                                                       \
159     }                                                           \
160   while (0)
161
162 #ifdef  RS6000_BI_ARCH
163
164 #undef  OPTION_TARGET_CPU_DEFAULT
165 #define OPTION_TARGET_CPU_DEFAULT \
166   (((TARGET_DEFAULT ^ target_flags) & MASK_64BIT) \
167    ? (char *) 0 : TARGET_CPU_DEFAULT)
168
169 #endif
170
171 #undef  ASM_DEFAULT_SPEC
172 #undef  ASM_SPEC
173 #undef  LINK_OS_LINUX_SPEC
174
175 /* FIXME: This will quite possibly choose the wrong dynamic linker.  */
176 #undef  LINK_OS_GNU_SPEC
177 #define LINK_OS_GNU_SPEC LINK_OS_LINUX_SPEC
178
179 #ifndef RS6000_BI_ARCH
180 #define ASM_DEFAULT_SPEC "-mppc64"
181 #define ASM_SPEC         "%(asm_spec64) %(asm_spec_common)"
182 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
183 #else
184 #if DEFAULT_ARCH64_P
185 #define ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
186 #define ASM_SPEC         "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
187 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
188 #else
189 #define ASM_DEFAULT_SPEC "-mppc%{m64:64}"
190 #define ASM_SPEC         "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
191 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
192 #endif
193 #endif
194
195 #define ASM_SPEC32 "-a32 %{Ym,*} %{Yd,*} \
196 %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} \
197 %{memb} %{!memb: %{msdata=eabi: -memb}} \
198 %{!mlittle: %{!mlittle-endian: %{!mbig: %{!mbig-endian: \
199     %{mcall-freebsd: -mbig} \
200     %{mcall-i960-old: -mlittle} \
201     %{mcall-linux: -mbig} \
202     %{mcall-gnu: -mbig} \
203     %{mcall-netbsd: -mbig} \
204 }}}}"
205
206 #define ASM_SPEC64 "-a64"
207
208 #define ASM_SPEC_COMMON "%(asm_cpu) \
209 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
210 %{Qy:} %{!Qn:-Qy} \
211 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
212
213 #undef  SUBSUBTARGET_EXTRA_SPECS
214 #define SUBSUBTARGET_EXTRA_SPECS \
215   { "asm_spec_common",          ASM_SPEC_COMMON },                      \
216   { "asm_spec32",               ASM_SPEC32 },                           \
217   { "asm_spec64",               ASM_SPEC64 },                           \
218   { "link_os_linux_spec32",     LINK_OS_LINUX_SPEC32 },                 \
219   { "link_os_linux_spec64",     LINK_OS_LINUX_SPEC64 },
220
221 #undef  MULTILIB_DEFAULTS
222 #if DEFAULT_ARCH64_P
223 #define MULTILIB_DEFAULTS { "m64" }
224 #else
225 #define MULTILIB_DEFAULTS { "m32" }
226 #endif
227
228 #ifndef RS6000_BI_ARCH
229
230 /* 64-bit PowerPC Linux is always big-endian.  */
231 #undef  TARGET_LITTLE_ENDIAN
232 #define TARGET_LITTLE_ENDIAN    0
233
234 /* 64-bit PowerPC Linux always has a TOC.  */
235 #undef  TARGET_TOC
236 #define TARGET_TOC              1
237
238 /* Some things from sysv4.h we don't do when 64 bit.  */
239 #undef  TARGET_RELOCATABLE
240 #define TARGET_RELOCATABLE      0
241 #undef  TARGET_EABI
242 #define TARGET_EABI             0
243 #undef  TARGET_PROTOTYPE
244 #define TARGET_PROTOTYPE        0
245 #undef RELOCATABLE_NEEDS_FIXUP
246 #define RELOCATABLE_NEEDS_FIXUP 0
247
248 #endif
249
250 /* We use glibc _mcount for profiling.  */
251 #define NO_PROFILE_COUNTERS 1
252 #define PROFILE_HOOK(LABEL) \
253   do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
254
255 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given.  */
256 #undef  ADJUST_FIELD_ALIGN
257 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
258   ((TARGET_ALTIVEC && TREE_CODE (TREE_TYPE (FIELD)) == VECTOR_TYPE)     \
259    ? 128                                                                \
260    : (TARGET_64BIT                                                      \
261       && TARGET_ALIGN_NATURAL == 0                                      \
262       && TYPE_MODE (strip_array_types (TREE_TYPE (FIELD))) == DFmode)   \
263    ? MIN ((COMPUTED), 32)                                               \
264    : (COMPUTED))
265
266 /* PowerPC64 Linux increases natural record alignment to doubleword if
267    the first field is an FP double, only if in power alignment mode.  */
268 #undef  ROUND_TYPE_ALIGN
269 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)                   \
270   ((TARGET_64BIT                                                        \
271     && (TREE_CODE (STRUCT) == RECORD_TYPE                               \
272         || TREE_CODE (STRUCT) == UNION_TYPE                             \
273         || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)                       \
274     && TARGET_ALIGN_NATURAL == 0)                                       \
275    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)      \
276    : MAX ((COMPUTED), (SPECIFIED)))
277
278 /* Use the default for compiling target libs.  */
279 #ifdef IN_TARGET_LIBS
280 #undef TARGET_ALIGN_NATURAL
281 #define TARGET_ALIGN_NATURAL 1
282 #endif
283
284 /* Indicate that jump tables go in the text section.  */
285 #undef  JUMP_TABLES_IN_TEXT_SECTION
286 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
287
288 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
289    than a doubleword should be padded upward or downward.  You could
290    reasonably assume that they follow the normal rules for structure
291    layout treating the parameter area as any other block of memory,
292    then map the reg param area to registers.  i.e. pad upward.
293    Setting both of the following defines results in this behavior.
294    Setting just the first one will result in aggregates that fit in a
295    doubleword being padded downward, and others being padded upward.
296    Not a bad idea as this results in struct { int x; } being passed
297    the same way as an int.  */
298 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
299 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
300
301 /* Specify padding for the last element of a block move between
302    registers and memory.  FIRST is nonzero if this is the only
303    element.  */
304 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
305   (!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
306
307 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
308    process.  */
309 #define OS_MISSING_POWERPC64 !TARGET_64BIT
310
311 #ifdef SINGLE_LIBC
312 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
313 #else
314 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
315 #endif
316
317 /* glibc has float and long double forms of math functions.  */
318 #undef  TARGET_C99_FUNCTIONS
319 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
320
321 /* Whether we have sincos that follows the GNU extension.  */
322 #undef  TARGET_HAS_SINCOS
323 #define TARGET_HAS_SINCOS (OPTION_GLIBC)
324
325 #undef  TARGET_OS_CPP_BUILTINS
326 #define TARGET_OS_CPP_BUILTINS()                        \
327   do                                                    \
328     {                                                   \
329       if (TARGET_64BIT)                                 \
330         {                                               \
331           builtin_define ("__PPC__");                   \
332           builtin_define ("__PPC64__");                 \
333           builtin_define ("__powerpc__");               \
334           builtin_define ("__powerpc64__");             \
335           builtin_assert ("cpu=powerpc64");             \
336           builtin_assert ("machine=powerpc64");         \
337         }                                               \
338       else                                              \
339         {                                               \
340           builtin_define_std ("PPC");                   \
341           builtin_define_std ("powerpc");               \
342           builtin_assert ("cpu=powerpc");               \
343           builtin_assert ("machine=powerpc");           \
344           TARGET_OS_SYSV_CPP_BUILTINS ();               \
345         }                                               \
346     }                                                   \
347   while (0)
348
349 #undef  CPP_OS_DEFAULT_SPEC
350 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
351
352 /* The GNU C++ standard library currently requires _GNU_SOURCE being
353    defined on glibc-based systems. This temporary hack accomplishes this,
354    it should go away as soon as libstdc++-v3 has a real fix.  */
355 #undef  CPLUSPLUS_CPP_SPEC
356 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
357
358 #undef  LINK_SHLIB_SPEC
359 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
360
361 #undef  LIB_DEFAULT_SPEC
362 #define LIB_DEFAULT_SPEC "%(lib_linux)"
363
364 #undef  STARTFILE_DEFAULT_SPEC
365 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
366
367 #undef  ENDFILE_DEFAULT_SPEC
368 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
369
370 #undef  LINK_START_DEFAULT_SPEC
371 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
372
373 #undef  LINK_OS_DEFAULT_SPEC
374 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
375
376 #define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
377 #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld64.so.1"
378 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
379 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
380 #if DEFAULT_LIBC == LIBC_UCLIBC
381 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
382 #elif DEFAULT_LIBC == LIBC_GLIBC
383 #define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
384 #else
385 #error "Unsupported DEFAULT_LIBC"
386 #endif
387 #define LINUX_DYNAMIC_LINKER32 \
388   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
389 #define LINUX_DYNAMIC_LINKER64 \
390   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
391
392
393 #define LINK_OS_LINUX_SPEC32 "-m elf32ppclinux %{!shared: %{!static: \
394   %{rdynamic:-export-dynamic} \
395   -dynamic-linker " LINUX_DYNAMIC_LINKER32 "}}"
396
397 #define LINK_OS_LINUX_SPEC64 "-m elf64ppc %{!shared: %{!static: \
398   %{rdynamic:-export-dynamic} \
399   -dynamic-linker " LINUX_DYNAMIC_LINKER64 "}}"
400
401 #undef  TOC_SECTION_ASM_OP
402 #define TOC_SECTION_ASM_OP \
403   (TARGET_64BIT                                         \
404    ? "\t.section\t\".toc\",\"aw\""                      \
405    : "\t.section\t\".got\",\"aw\"")
406
407 #undef  MINIMAL_TOC_SECTION_ASM_OP
408 #define MINIMAL_TOC_SECTION_ASM_OP \
409   (TARGET_64BIT                                         \
410    ? "\t.section\t\".toc1\",\"aw\""                     \
411    : ((TARGET_RELOCATABLE || flag_pic)                  \
412       ? "\t.section\t\".got2\",\"aw\""                  \
413       : "\t.section\t\".got1\",\"aw\""))
414
415 #undef  TARGET_VERSION
416 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
417
418 /* Must be at least as big as our pointer type.  */
419 #undef  SIZE_TYPE
420 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
421
422 #undef  PTRDIFF_TYPE
423 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
424
425 #undef  WCHAR_TYPE
426 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
427 #undef  WCHAR_TYPE_SIZE
428 #define WCHAR_TYPE_SIZE 32
429
430 /* Override rs6000.h definition.  */
431 #undef  ASM_APP_ON
432 #define ASM_APP_ON "#APP\n"
433
434 /* Override rs6000.h definition.  */
435 #undef  ASM_APP_OFF
436 #define ASM_APP_OFF "#NO_APP\n"
437
438 /* PowerPC no-op instruction.  */
439 #undef  RS6000_CALL_GLUE
440 #define RS6000_CALL_GLUE (TARGET_64BIT ? "nop" : "cror 31,31,31")
441
442 #undef  RS6000_MCOUNT
443 #define RS6000_MCOUNT "_mcount"
444
445 #ifdef __powerpc64__
446 /* _init and _fini functions are built from bits spread across many
447    object files, each potentially with a different TOC pointer.  For
448    that reason, place a nop after the call so that the linker can
449    restore the TOC pointer if a TOC adjusting call stub is needed.  */
450 #if DOT_SYMBOLS
451 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
452   asm (SECTION_OP "\n"                                  \
453 "       bl ." #FUNC "\n"                                \
454 "       nop\n"                                          \
455 "       .previous");
456 #else
457 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
458   asm (SECTION_OP "\n"                                  \
459 "       bl " #FUNC "\n"                                 \
460 "       nop\n"                                          \
461 "       .previous");
462 #endif
463 #endif
464
465 /* FP save and restore routines.  */
466 #undef  SAVE_FP_PREFIX
467 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
468 #undef  SAVE_FP_SUFFIX
469 #define SAVE_FP_SUFFIX ""
470 #undef  RESTORE_FP_PREFIX
471 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
472 #undef  RESTORE_FP_SUFFIX
473 #define RESTORE_FP_SUFFIX ""
474
475 /* Dwarf2 debugging.  */
476 #undef  PREFERRED_DEBUGGING_TYPE
477 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
478
479 /* This is how to declare the size of a function.  */
480 #undef  ASM_DECLARE_FUNCTION_SIZE
481 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
482   do                                                                    \
483     {                                                                   \
484       if (!flag_inhibit_size_directive)                                 \
485         {                                                               \
486           fputs ("\t.size\t", (FILE));                                  \
487           if (TARGET_64BIT && DOT_SYMBOLS)                              \
488             putc ('.', (FILE));                                         \
489           assemble_name ((FILE), (FNAME));                              \
490           fputs (",.-", (FILE));                                        \
491           rs6000_output_function_entry (FILE, FNAME);                   \
492           putc ('\n', (FILE));                                          \
493         }                                                               \
494     }                                                                   \
495   while (0)
496
497 /* Return nonzero if this entry is to be written into the constant
498    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
499    or a CONST containing one of them.  If -mfp-in-toc (the default),
500    we also do this for floating-point constants.  We actually can only
501    do this if the FP formats of the target and host machines are the
502    same, but we can't check that since not every file that uses
503    the macros includes real.h.  We also do this when we can write the
504    entry into the TOC and the entry is not larger than a TOC entry.  */
505
506 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
507 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
508   (TARGET_TOC                                                           \
509    && (GET_CODE (X) == SYMBOL_REF                                       \
510        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
511            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
512        || GET_CODE (X) == LABEL_REF                                     \
513        || (GET_CODE (X) == CONST_INT                                    \
514            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
515        || (GET_CODE (X) == CONST_DOUBLE                                 \
516            && ((TARGET_64BIT                                            \
517                 && (TARGET_MINIMAL_TOC                                  \
518                     || (SCALAR_FLOAT_MODE_P (GET_MODE (X))              \
519                         && ! TARGET_NO_FP_IN_TOC)))                     \
520                || (!TARGET_64BIT                                        \
521                    && !TARGET_NO_FP_IN_TOC                              \
522                    && !TARGET_RELOCATABLE                               \
523                    && SCALAR_FLOAT_MODE_P (GET_MODE (X))                \
524                    && BITS_PER_WORD == HOST_BITS_PER_INT)))))
525
526 /* Select a format to encode pointers in exception handling data.  CODE
527    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
528    true if the symbol may be affected by dynamic relocations.  */
529 #undef  ASM_PREFERRED_EH_DATA_FORMAT
530 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
531   ((TARGET_64BIT || flag_pic || TARGET_RELOCATABLE)                     \
532    ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel               \
533       | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4))             \
534    : DW_EH_PE_absptr)
535
536 /* For backward compatibility, we must continue to use the AIX
537    structure return convention.  */
538 #undef DRAFT_V4_STRUCT_RET
539 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
540
541 #define TARGET_ASM_FILE_END rs6000_elf_end_indicate_exec_stack
542
543 #define TARGET_POSIX_IO
544
545 #define LINK_GCC_C_SEQUENCE_SPEC \
546   "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
547
548 /* Use --as-needed -lgcc_s for eh support.  */
549 #ifdef HAVE_LD_AS_NEEDED
550 #define USE_LD_AS_NEEDED 1
551 #endif
552
553 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
554
555 #ifdef TARGET_LIBC_PROVIDES_SSP
556 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
557    ppc64 glibc provides it at -0x7010(13).  */
558 #define TARGET_THREAD_SSP_OFFSET        (TARGET_64BIT ? -0x7010 : -0x7008)
559 #endif
560
561 #define POWERPC_LINUX
562
563 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later.  */
564 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
565 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
566 #endif
567
568 /* Static stack checking is supported by means of probes.  */
569 #define STACK_CHECK_STATIC_BUILTIN 1
570
571 /* The default value isn't sufficient in 64-bit mode.  */
572 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)