gcc/config/rs6000/linux64.h

   1 /* Definitions of target machine for GNU compiler,
   2    for 64 bit powerpc linux.
   3    Copyright (C) 2000, 2001 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 (MASK_POWERPC | MASK_POWERPC64 | MASK_64BIT | MASK_NEW_MNEMONICS)
  32
  33 #define USER_LABEL_PREFIX  ""
  34
  35 /* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
  36 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
  37   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
  38               ? get_inner_array_type (FIELD) \
  39               : TREE_TYPE (FIELD)) == DFmode \
  40    ? MIN ((COMPUTED), 32) : (COMPUTED))
  41
  42 /* AIX increases natural record alignment to doubleword if the first
  43    field is an FP double while the FP fields remain word aligned.  */
  44 #undef ROUND_TYPE_ALIGN
  45 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
  46   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
  47     || TREE_CODE (STRUCT) == UNION_TYPE                 \
  48     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
  49    && TYPE_FIELDS (STRUCT) != 0                         \
  50    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
  51    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)            \
  52    : MAX ((COMPUTED), (SPECIFIED)))
  53
  54 /* Indicate that jump tables go in the text section.  */
  55 #undef  JUMP_TABLES_IN_TEXT_SECTION
  56 #define JUMP_TABLES_IN_TEXT_SECTION 1
  57
  58 /* Define cutoff for using external functions to save floating point.  */
  59 #undef  FP_SAVE_INLINE
  60 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) == 62 || (FIRST_REG) == 63)
  61
  62 /* 64-bit PowerPC Linux always has a TOC.  */
  63 #undef  TARGET_NO_TOC
  64 #define TARGET_NO_TOC           0
  65 #undef  TARGET_TOC
  66 #define TARGET_TOC              1
  67
  68 /* 64-bit PowerPC Linux always has GPR13 fixed.  */
  69 #define FIXED_R13               1
  70
  71 /* __throw will restore its own return address to be the same as the
  72    return address of the function that the throw is being made to.
  73    This is unfortunate, because we want to check the original
  74    return address to see if we need to restore the TOC.
  75    So we have to squirrel it away with this.  */
  76 #define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()
  77
  78 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
  79
  80 /* Don't assume anything about the header files.  */
  81 #define NO_IMPLICIT_EXTERN_C
  82
  83 #undef MD_EXEC_PREFIX
  84 #undef MD_STARTFILE_PREFIX
  85
  86 #undef CPP_PREDEFINES
  87 #define CPP_PREDEFINES \
  88  "-D_PPC_ -D__PPC__ -D_PPC64_ -D__PPC64__ -D__powerpc__ -D__powerpc64__ \
  89   -D_PIC_ -D__PIC__ -D_BIG_ENDIAN -D__BIG_ENDIAN__ -D__ELF__ \
  90   -D__LONG_MAX__=9223372036854775807L \
  91   -Acpu=powerpc64 -Amachine=powerpc64"
  92
  93 #undef  CPP_OS_DEFAULT_SPEC
  94 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
  95
  96 /* The GNU C++ standard library currently requires _GNU_SOURCE being
  97    defined on glibc-based systems. This temporary hack accomplishes this,
  98    it should go away as soon as libstdc++-v3 has a real fix.  */
  99 #undef  CPLUSPLUS_CPP_SPEC
 100 #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
 101
 102 #undef  LINK_SHLIB_SPEC
 103 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
 104
 105 #undef  LIB_DEFAULT_SPEC
 106 #define LIB_DEFAULT_SPEC "%(lib_linux)"
 107
 108 #undef  STARTFILE_DEFAULT_SPEC
 109 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
 110
 111 #undef  ENDFILE_DEFAULT_SPEC
 112 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
 113
 114 #undef  LINK_START_DEFAULT_SPEC
 115 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
 116
 117 #undef  LINK_OS_DEFAULT_SPEC
 118 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 119
 120 #undef  LINK_OS_LINUX_SPEC
 121 #define LINK_OS_LINUX_SPEC "-m elf64ppc %{!shared: %{!static: \
 122   %{rdynamic:-export-dynamic} \
 123   %{!dynamic-linker:-dynamic-linker /lib/ld.so.1}}}"
 124
 125 #undef  TOC_SECTION_ASM_OP
 126 #define TOC_SECTION_ASM_OP "\t.section\t\".toc\",\"aw\""
 127
 128 #undef  MINIMAL_TOC_SECTION_ASM_OP
 129 #define MINIMAL_TOC_SECTION_ASM_OP "\t.section\t\".toc1\",\"aw\"\n\t.align 3"
 130
 131 #undef  TARGET_VERSION
 132 #define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");
 133
 134 /* Must be at least as big as our pointer type.  */
 135 #undef  SIZE_TYPE
 136 #define SIZE_TYPE "long unsigned int"
 137
 138 #undef  PTRDIFF_TYPE
 139 #define PTRDIFF_TYPE "long int"
 140
 141 #undef  WCHAR_TYPE
 142 #define WCHAR_TYPE "int"
 143 #undef  WCHAR_TYPE_SIZE
 144 #define WCHAR_TYPE_SIZE 32
 145
 146 /* Override rs6000.h definition.  */
 147 #undef  ASM_APP_ON
 148 #define ASM_APP_ON "#APP\n"
 149
 150 /* Override rs6000.h definition.  */
 151 #undef  ASM_APP_OFF
 152 #define ASM_APP_OFF "#NO_APP\n"
 153
 154 /* PowerPC no-op instruction.  */
 155 #undef  RS6000_CALL_GLUE
 156 #define RS6000_CALL_GLUE "nop"
 157
 158 #undef  RS6000_MCOUNT
 159 #define RS6000_MCOUNT ".__mcount"
 160
 161 /* FP save and restore routines.  */
 162 #undef  SAVE_FP_PREFIX
 163 #define SAVE_FP_PREFIX "._savef"
 164 #undef  SAVE_FP_SUFFIX
 165 #define SAVE_FP_SUFFIX ""
 166 #undef  RESTORE_FP_PREFIX
 167 #define RESTORE_FP_PREFIX "._restf"
 168 #undef  RESTORE_FP_SUFFIX
 169 #define RESTORE_FP_SUFFIX ""
 170
 171 /* Dwarf2 debugging.  */
 172 #undef  PREFERRED_DEBUGGING_TYPE
 173 #define PREFERRED_DEBUGGING_TYPE  DWARF2_DEBUG
 174
 175 /* This macro gets just the user-specified name
 176    out of the string in a SYMBOL_REF.  Discard
 177    a leading * or @.  */
 178 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME)                            \
 179 do {                                                                    \
 180   const char *_name = SYMBOL_NAME;                                      \
 181   while (*_name == '*' || *_name == '@')                                \
 182     _name++;                                                            \
 183   (VAR) = _name;                                                        \
 184 } while (0)
 185
 186 /* This is how to output a reference to a user-level label named NAME.
 187    `assemble_name' uses this.  */
 188
 189 /* Override elfos.h definition.  */
 190 #undef  ASM_OUTPUT_LABELREF
 191 #define ASM_OUTPUT_LABELREF(FILE,NAME)          \
 192 do {                                            \
 193   const char *_name = NAME;                     \
 194   if (*_name == '@')                            \
 195     _name++;                                    \
 196                                                 \
 197   if (*_name == '*')                            \
 198     fprintf (FILE, "%s", _name + 1);            \
 199   else                                          \
 200     asm_fprintf (FILE, "%U%s", _name);          \
 201 } while (0)
 202
 203 #undef  ASM_DECLARE_FUNCTION_NAME
 204 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 205   do {                                                                  \
 206     if (TARGET_RELOCATABLE && (get_pool_size () != 0 || profile_flag)   \
 207         && uses_TOC())                                                  \
 208       {                                                                 \
 209         char buf[256];                                                  \
 210                                                                         \
 211         ASM_OUTPUT_INTERNAL_LABEL (FILE, "LCL", rs6000_pic_labelno);    \
 212                                                                         \
 213         ASM_GENERATE_INTERNAL_LABEL (buf, "LCTOC", 1);                  \
 214         fputs ("\t.quad ", FILE);                                       \
 215         assemble_name (FILE, buf);                                      \
 216         putc ('-', FILE);                                               \
 217         ASM_GENERATE_INTERNAL_LABEL (buf, "LCF", rs6000_pic_labelno);   \
 218         assemble_name (FILE, buf);                                      \
 219         putc ('\n', FILE);                                              \
 220       }                                                                 \
 221                                                                         \
 222     fprintf (FILE, "%s", TYPE_ASM_OP);                                  \
 223     assemble_name (FILE, NAME);                                         \
 224     putc (',', FILE);                                                   \
 225     fprintf (FILE, TYPE_OPERAND_FMT, "function");                       \
 226     putc ('\n', FILE);                                                  \
 227     ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));                      \
 228                                                                         \
 229     if (DEFAULT_ABI == ABI_AIX)                                         \
 230       {                                                                 \
 231         const char *desc_name, *orig_name;                              \
 232                                                                         \
 233         STRIP_NAME_ENCODING (orig_name, NAME);                          \
 234         desc_name = orig_name;                                          \
 235         while (*desc_name == '.')                                       \
 236           desc_name++;                                                  \
 237                                                                         \
 238         if (TREE_PUBLIC (DECL))                                         \
 239           fprintf (FILE, "\t.globl %s\n", desc_name);                   \
 240                                                                         \
 241         fputs ("\t.section\t\".opd\",\"aw\"\n", FILE);                  \
 242         fprintf (FILE, "%s:\n", desc_name);                             \
 243         fprintf (FILE, "\t.quad %s\n", orig_name);                      \
 244         fputs ("\t.quad .TOC.@tocbase\n", FILE);                        \
 245         if (DEFAULT_ABI == ABI_AIX)                                     \
 246           fputs ("\t.quad 0\n", FILE);                                  \
 247         fprintf (FILE, "\t.previous\n");                                \
 248       }                                                                 \
 249     ASM_OUTPUT_LABEL (FILE, NAME);                                      \
 250   } while (0)
 251
 252 /* Return non-zero if this entry is to be written into the constant
 253    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 254    or a CONST containing one of them.  If -mfp-in-toc (the default),
 255    we also do this for floating-point constants.  We actually can only
 256    do this if the FP formats of the target and host machines are the
 257    same, but we can't check that since not every file that uses
 258    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
 259    we can write the entry into the TOC and the entry is not larger
 260    than a TOC entry.  */
 261
 262 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 263 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 264   (TARGET_TOC                                                           \
 265    && (GET_CODE (X) == SYMBOL_REF                                       \
 266        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 267            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 268        || GET_CODE (X) == LABEL_REF                                     \
 269        || (GET_CODE (X) == CONST_INT                                    \
 270            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 271        || (GET_CODE (X) == CONST_DOUBLE                                 \
 272            && (TARGET_POWERPC64                                         \
 273                || TARGET_MINIMAL_TOC                                    \
 274                || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT          \
 275                    && ! TARGET_NO_FP_IN_TOC)))))
 276
 277 #undef  ASM_DEFAULT_SPEC
 278 #define ASM_DEFAULT_SPEC "-mppc64"
 279
 280 /* We don't need to generate entries in .fixup.  */
 281 #undef RELOCATABLE_NEEDS_FIXUP