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 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Yes!  We are AIX! Err. Wait. We're Linux!. No, wait, we're a
  23   combo of both!*/
  24 #undef  DEFAULT_ABI
  25 #define DEFAULT_ABI ABI_AIX
  26
  27 #undef TARGET_AIX
  28 #define TARGET_AIX 1
  29
  30 #undef TARGET_DEFAULT
  31 #define TARGET_DEFAULT \
  32   (MASK_POWERPC | MASK_POWERPC64 | MASK_64BIT | MASK_NEW_MNEMONICS)
  33
  34 #undef PROCESSOR_DEFAULT
  35 #define PROCESSOR_DEFAULT PROCESSOR_PPC630
  36 #undef PROCESSOR_DEFAULT64
  37 #define PROCESSOR_DEFAULT64 PROCESSOR_PPC630
  38
  39 #undef  ASM_DEFAULT_SPEC
  40 #define ASM_DEFAULT_SPEC "-mppc64"
  41
  42 #undef  ASM_SPEC
  43 #define ASM_SPEC "%{.s: %{mregnames} %{mno-regnames}} \
  44 %{.S: %{mregnames} %{mno-regnames}} \
  45 %{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian} \
  46 %{v:-V} %{Qy:} %{!Qn:-Qy} -a64 %(asm_cpu) %{Wa,*:%*}"
  47
  48 /* 64-bit PowerPC Linux always has a TOC.  */
  49 #undef  TARGET_NO_TOC
  50 #define TARGET_NO_TOC           0
  51 #undef  TARGET_TOC
  52 #define TARGET_TOC              1
  53
  54 /* We use glibc _mcount for profiling.  */
  55 #define NO_PROFILE_COUNTERS 1
  56 #undef  PROFILE_BEFORE_PROLOGUE
  57
  58 /* Define this for kernel profiling, which just saves LR then calls
  59    _mcount without worrying about arg saves.  The idea is to change
  60    the function prologue as little as possible as it isn't easy to
  61    account for arg save/restore code added just for _mcount.  */
  62 /* #define PROFILE_KERNEL 1 */
  63 #if PROFILE_KERNEL
  64 #define PROFILE_BEFORE_PROLOGUE 1
  65 #undef  PROFILE_HOOK
  66 #else
  67 #define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
  68 #endif
  69
  70 /* We don't need to generate entries in .fixup.  */
  71 #undef RELOCATABLE_NEEDS_FIXUP
  72
  73 #define USER_LABEL_PREFIX  ""
  74
  75 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
  76 #undef  ADJUST_FIELD_ALIGN
  77 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
  78   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
  79               ? get_inner_array_type (FIELD) \
  80               : TREE_TYPE (FIELD)) == DFmode \
  81    ? MIN ((COMPUTED), 32) : (COMPUTED))
  82
  83 /* AIX increases natural record alignment to doubleword if the first
  84    field is an FP double while the FP fields remain word aligned.  */
  85 #undef ROUND_TYPE_ALIGN
  86 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
  87   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
  88     || TREE_CODE (STRUCT) == UNION_TYPE                 \
  89     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
  90    && TYPE_FIELDS (STRUCT) != 0                         \
  91    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
  92    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)            \
  93    : MAX ((COMPUTED), (SPECIFIED)))
  94
  95 /* Indicate that jump tables go in the text section.  */
  96 #undef  JUMP_TABLES_IN_TEXT_SECTION
  97 #define JUMP_TABLES_IN_TEXT_SECTION 1
  98
  99 /* 64-bit PowerPC Linux always has GPR13 fixed.  */
 100 #define FIXED_R13               1
 101
 102 /* __throw will restore its own return address to be the same as the
 103    return address of the function that the throw is being made to.
 104    This is unfortunate, because we want to check the original
 105    return address to see if we need to restore the TOC.
 106    So we have to squirrel it away with this.  */
 107 #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()
 108
 109 /* Don't assume anything about the header files.  */
 110 #define NO_IMPLICIT_EXTERN_C
 111
 112 /* Override svr4.h  */
 113 #undef MD_EXEC_PREFIX
 114 #undef MD_STARTFILE_PREFIX
 115
 116 #undef TARGET_OS_CPP_BUILTINS
 117 #define TARGET_OS_CPP_BUILTINS()            \
 118   do                                        \
 119     {                                       \
 120       builtin_define ("__PPC__");           \
 121       builtin_define ("__PPC64__");         \
 122       builtin_define ("__powerpc__");       \
 123       builtin_define ("__powerpc64__");     \
 124       builtin_define ("__PIC__");           \
 125       builtin_define ("__ELF__");           \
 126       builtin_assert ("cpu=powerpc64");     \
 127       builtin_assert ("machine=powerpc64"); \
 128     }                                       \
 129   while (0)
 130
 131 #undef  CPP_OS_DEFAULT_SPEC
 132 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 133
 134 /* The GNU C++ standard library currently requires _GNU_SOURCE being
 135    defined on glibc-based systems. This temporary hack accomplishes this,
 136    it should go away as soon as libstdc++-v3 has a real fix.  */
 137 #undef  CPLUSPLUS_CPP_SPEC
 138 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 139
 140 #undef  LINK_SHLIB_SPEC
 141 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 142
 143 #undef  LIB_DEFAULT_SPEC
 144 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 145
 146 #undef  STARTFILE_DEFAULT_SPEC
 147 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 148
 149 #undef  ENDFILE_DEFAULT_SPEC
 150 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 151
 152 #undef  LINK_START_DEFAULT_SPEC
 153 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 154
 155 #undef  LINK_OS_DEFAULT_SPEC
 156 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 157
 158 #undef  LINK_OS_LINUX_SPEC
 159 #define LINK_OS_LINUX_SPEC "-m elf64ppc %{!shared: %{!static: \
 160   %{rdynamic:-export-dynamic} \
 161   %{!dynamic-linker:-dynamic-linker /lib64/ld64.so.1}}}"
 162
 163 #ifdef NATIVE_CROSS
 164 #define STARTFILE_PREFIX_SPEC "/usr/local/lib64/ /lib64/ /usr/lib64/"
 165 #endif
 166
 167 #undef  STARTFILE_LINUX_SPEC
 168 #define STARTFILE_LINUX_SPEC "\
 169 %{!shared: %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}} crti.o%s \
 170 %{static:crtbeginT.o%s} \
 171 %{!static:%{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}}"
 172
 173 #undef  ENDFILE_LINUX_SPEC
 174 #define ENDFILE_LINUX_SPEC "\
 175 %{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
 176
 177 #undef  TOC_SECTION_ASM_OP
 178 #define TOC_SECTION_ASM_OP "\t.section\t\".toc\",\"aw\""
 179
 180 #undef  MINIMAL_TOC_SECTION_ASM_OP
 181 #define MINIMAL_TOC_SECTION_ASM_OP "\t.section\t\".toc1\",\"aw\""
 182
 183 #undef  TARGET_VERSION
 184 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 185
 186 /* Must be at least as big as our pointer type.  */
 187 #undef  SIZE_TYPE
 188 #define SIZE_TYPE "long unsigned int"
 189
 190 #undef  PTRDIFF_TYPE
 191 #define PTRDIFF_TYPE "long int"
 192
 193 #undef  WCHAR_TYPE
 194 #define WCHAR_TYPE "int"
 195 #undef  WCHAR_TYPE_SIZE
 196 #define WCHAR_TYPE_SIZE 32
 197
 198 /* Override rs6000.h definition.  */
 199 #undef  ASM_APP_ON
 200 #define ASM_APP_ON "#APP\n"
 201
 202 /* Override rs6000.h definition.  */
 203 #undef  ASM_APP_OFF
 204 #define ASM_APP_OFF "#NO_APP\n"
 205
 206 /* PowerPC no-op instruction.  */
 207 #undef  RS6000_CALL_GLUE
 208 #define RS6000_CALL_GLUE "nop"
 209
 210 #undef  RS6000_MCOUNT
 211 #define RS6000_MCOUNT "_mcount"
 212
 213 /* FP save and restore routines.  */
 214 #undef  SAVE_FP_PREFIX
 215 #define SAVE_FP_PREFIX "._savef"
 216 #undef  SAVE_FP_SUFFIX
 217 #define SAVE_FP_SUFFIX ""
 218 #undef  RESTORE_FP_PREFIX
 219 #define RESTORE_FP_PREFIX "._restf"
 220 #undef  RESTORE_FP_SUFFIX
 221 #define RESTORE_FP_SUFFIX ""
 222
 223 /* Dwarf2 debugging.  */
 224 #undef  PREFERRED_DEBUGGING_TYPE
 225 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 226
 227 #undef  TARGET_ENCODE_SECTION_INFO
 228 #define TARGET_ENCODE_SECTION_INFO  rs6000_xcoff_encode_section_info
 229
 230 /* This is how to output a reference to a user-level label named NAME.
 231    `assemble_name' uses this.  */
 232
 233 /* Override elfos.h definition.  */
 234 #undef  ASM_OUTPUT_LABELREF
 235 #define ASM_OUTPUT_LABELREF(FILE,NAME)          \
 236 do {                                            \
 237   const char *_name = NAME;                     \
 238   if (*_name == '@')                            \
 239     _name++;                                    \
 240                                                 \
 241   if (*_name == '*')                            \
 242     fprintf (FILE, "%s", _name + 1);            \
 243   else                                          \
 244     asm_fprintf (FILE, "%U%s", _name);          \
 245 } while (0)
 246
 247 #undef  ASM_DECLARE_FUNCTION_NAME
 248 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 249   do                                                                    \
 250     {                                                                   \
 251       fputs ("\t.section\t\".opd\",\"aw\"\n\t.align 3\n", (FILE));      \
 252       ASM_OUTPUT_LABEL ((FILE), (NAME));                                \
 253       fputs (DOUBLE_INT_ASM_OP, (FILE));                                \
 254       putc ('.', (FILE));                                               \
 255       assemble_name ((FILE), (NAME));                                   \
 256       fputs (",.TOC.@tocbase,0\n\t.previous\n\t.size\t", (FILE));       \
 257       assemble_name ((FILE), (NAME));                                   \
 258       fputs (",24\n\t.type\t.", (FILE));                                \
 259       assemble_name ((FILE), (NAME));                                   \
 260       fputs (",@function\n", (FILE));                                   \
 261       if (TREE_PUBLIC (DECL) && ! DECL_WEAK (DECL))                     \
 262         {                                                               \
 263           fputs ("\t.globl\t.", (FILE));                                \
 264           assemble_name ((FILE), (NAME));                               \
 265           putc ('\n', (FILE));                                          \
 266         }                                                               \
 267       ASM_DECLARE_RESULT ((FILE), DECL_RESULT (DECL));                  \
 268       putc ('.', (FILE));                                               \
 269       ASM_OUTPUT_LABEL ((FILE), (NAME));                                \
 270     }                                                                   \
 271   while (0)
 272
 273 /* This is how to declare the size of a function.  */
 274 #undef  ASM_DECLARE_FUNCTION_SIZE
 275 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)                    \
 276   do                                                                    \
 277     {                                                                   \
 278       if (!flag_inhibit_size_directive)                                 \
 279         {                                                               \
 280           fputs ("\t.size\t.", (FILE));                                 \
 281           assemble_name ((FILE), (FNAME));                              \
 282           fputs (",.-.", (FILE));                                       \
 283           assemble_name ((FILE), (FNAME));                              \
 284           putc ('\n', (FILE));                                          \
 285         }                                                               \
 286     }                                                                   \
 287   while (0)
 288
 289 /* Return non-zero if this entry is to be written into the constant
 290    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 291    or a CONST containing one of them.  If -mfp-in-toc (the default),
 292    we also do this for floating-point constants.  We actually can only
 293    do this if the FP formats of the target and host machines are the
 294    same, but we can't check that since not every file that uses
 295    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
 296    we can write the entry into the TOC and the entry is not larger
 297    than a TOC entry.  */
 298
 299 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 300 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 301   (TARGET_TOC                                                           \
 302    && (GET_CODE (X) == SYMBOL_REF                                       \
 303        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 304            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 305        || GET_CODE (X) == LABEL_REF                                     \
 306        || (GET_CODE (X) == CONST_INT                                    \
 307            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 308        || (GET_CODE (X) == CONST_DOUBLE                                 \
 309            && (TARGET_POWERPC64                                         \
 310                || TARGET_MINIMAL_TOC                                    \
 311                || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT          \
 312                    && ! TARGET_NO_FP_IN_TOC)))))
 313
 314 /* This is the same as the dbxelf.h version, except that we need to
 315    use the function code label, not the function descriptor.  */
 316 #undef  ASM_OUTPUT_SOURCE_LINE
 317 #define ASM_OUTPUT_SOURCE_LINE(FILE, LINE)                              \
 318 do                                                                      \
 319   {                                                                     \
 320     static int sym_lineno = 1;                                          \
 321     char temp[256];                                                     \
 322     ASM_GENERATE_INTERNAL_LABEL (temp, "LM", sym_lineno);               \
 323     fprintf (FILE, "\t.stabn 68,0,%d,", LINE);                          \
 324     assemble_name (FILE, temp);                                         \
 325     fputs ("-.", FILE);                                                 \
 326     assemble_name (FILE,                                                \
 327                    XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
 328     putc ('\n', FILE);                                                  \
 329     ASM_OUTPUT_INTERNAL_LABEL (FILE, "LM", sym_lineno);                 \
 330     sym_lineno += 1;                                                    \
 331   }                                                                     \
 332 while (0)
 333
 334 /* Similarly, we want the function code label here.  */
 335 #define DBX_OUTPUT_BRAC(FILE, NAME, BRAC) \
 336   do                                                                    \
 337     {                                                                   \
 338       const char *flab;                                                 \
 339       fprintf (FILE, "%s%d,0,0,", ASM_STABN_OP, BRAC);                  \
 340       assemble_name (FILE, NAME);                                       \
 341       putc ('-', FILE);                                                 \
 342       if (current_function_func_begin_label != NULL_TREE)               \
 343         flab = IDENTIFIER_POINTER (current_function_func_begin_label);  \
 344       else                                                              \
 345         {                                                               \
 346           putc ('.', FILE);                                             \
 347           flab = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);  \
 348         }                                                               \
 349       assemble_name (FILE, flab);                                       \
 350       putc ('\n', FILE);                                                \
 351     }                                                                   \
 352   while (0)
 353
 354 #define DBX_OUTPUT_LBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_LBRAC)
 355 #define DBX_OUTPUT_RBRAC(FILE, NAME) DBX_OUTPUT_BRAC (FILE, NAME, N_RBRAC)
 356
 357 /* Override sysv4.h as these are ABI_V4 only.  */
 358 #undef  ASM_OUTPUT_REG_PUSH
 359 #undef  ASM_OUTPUT_REG_POP
 360
 361 /* Select a format to encode pointers in exception handling data.  CODE
 362    is 0 for data, 1 for code labels, 2 for function pointers.  GLOBAL is
 363    true if the symbol may be affected by dynamic relocations.  */
 364 #undef  ASM_PREFERRED_EH_DATA_FORMAT
 365 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
 366   (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_udata8)