gcc/config/rs6000/xcoff.h

   1 /* Definitions of target machine for GNU compiler,
   2    for some generic XCOFF file format
   3    Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 2, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING.  If not, write to the
  19    Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  20    MA 02111-1307, USA.  */
  21
  22 #define TARGET_OBJECT_FORMAT OBJECT_XCOFF
  23
  24 /* The RS/6000 uses the XCOFF format.  */
  25 #define XCOFF_DEBUGGING_INFO 1
  26
  27 /* Define if the object format being used is COFF or a superset.  */
  28 #define OBJECT_FORMAT_COFF
  29
  30 /* Define the magic numbers that we recognize as COFF.
  31
  32     AIX 4.3 adds U803XTOCMAGIC (0757) for 64-bit objects and AIX V5 adds
  33     U64_TOCMAGIC (0767), but collect2.c does not include files in the
  34     correct order to conditionally define the symbolic name in this macro.
  35
  36     The AIX linker accepts import/export files as object files,
  37     so accept "#!" (0x2321) magic number.  */
  38 #define MY_ISCOFF(magic) \
  39   ((magic) == U802WRMAGIC || (magic) == U802ROMAGIC \
  40    || (magic) == U802TOCMAGIC || (magic) == 0757 || (magic) == 0767 \
  41    || (magic) == 0x2321)
  42
  43 /* We don't have GAS for the RS/6000 yet, so don't write out special
  44     .stabs in cc1plus.  */
  45
  46 #define FASCIST_ASSEMBLER
  47
  48 /* We define this to prevent the name mangler from putting dollar signs into
  49    function names.  */
  50
  51 #define NO_DOLLAR_IN_LABEL
  52
  53 /* We define this to 0 so that gcc will never accept a dollar sign in a
  54    variable name.  This is needed because the AIX assembler will not accept
  55    dollar signs.  */
  56
  57 #define DOLLARS_IN_IDENTIFIERS 0
  58
  59 /* Define the extra sections we need.  We define three: one is the read-only
  60    data section which is used for constants.  This is a csect whose name is
  61    derived from the name of the input file.  The second is for initialized
  62    global variables.  This is a csect whose name is that of the variable.
  63    The third is the TOC.  */
  64
  65 #define EXTRA_SECTIONS \
  66    read_only_data, private_data, read_only_private_data, toc, bss
  67
  68 /* Define the routines to implement these extra sections.
  69    BIGGEST_ALIGNMENT is 64, so align the sections that much.  */
  70
  71 #define EXTRA_SECTION_FUNCTIONS                         \
  72                                                         \
  73 void                                                    \
  74 read_only_data_section ()                               \
  75 {                                                       \
  76   if (in_section != read_only_data)                     \
  77     {                                                   \
  78       fprintf (asm_out_file, "\t.csect %s[RO],3\n",     \
  79                xcoff_read_only_section_name);           \
  80       in_section = read_only_data;                      \
  81     }                                                   \
  82 }                                                       \
  83                                                         \
  84 void                                                    \
  85 private_data_section ()                                 \
  86 {                                                       \
  87   if (in_section != private_data)                       \
  88     {                                                   \
  89       fprintf (asm_out_file, "\t.csect %s[RW],3\n",     \
  90                xcoff_private_data_section_name);        \
  91       in_section = private_data;                        \
  92     }                                                   \
  93 }                                                       \
  94                                                         \
  95 void                                                    \
  96 read_only_private_data_section ()                       \
  97 {                                                       \
  98   if (in_section != read_only_private_data)             \
  99     {                                                   \
 100       fprintf (asm_out_file, "\t.csect %s[RO],3\n",     \
 101                xcoff_private_data_section_name);        \
 102       in_section = read_only_private_data;              \
 103     }                                                   \
 104 }                                                       \
 105                                                         \
 106 void                                                    \
 107 toc_section ()                                          \
 108 {                                                       \
 109   if (TARGET_MINIMAL_TOC)                               \
 110     {                                                   \
 111       /* toc_section is always called at least once     \
 112          from rs6000_xcoff_file_start, so this is       \
 113          guaranteed to always be defined once and       \
 114          only once in each file.  */                    \
 115       if (! toc_initialized)                            \
 116         {                                               \
 117           fputs ("\t.toc\nLCTOC..1:\n", asm_out_file);  \
 118           fputs ("\t.tc toc_table[TC],toc_table[RW]\n", asm_out_file); \
 119           toc_initialized = 1;                          \
 120         }                                               \
 121                                                         \
 122       if (in_section != toc)                            \
 123         fprintf (asm_out_file, "\t.csect toc_table[RW]%s\n",    \
 124                  (TARGET_32BIT ? "" : ",3"));           \
 125     }                                                   \
 126   else                                                  \
 127     {                                                   \
 128       if (in_section != toc)                            \
 129         fputs ("\t.toc\n", asm_out_file);               \
 130     }                                                   \
 131   in_section = toc;                                     \
 132 }
 133
 134 /* Define the name of our readonly data section.  */
 135
 136 #define READONLY_DATA_SECTION read_only_data_section
 137
 138 /* Return nonzero if this entry is to be written into the constant
 139    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
 140    or a CONST containing one of them.  If -mfp-in-toc (the default),
 141    we also do this for floating-point constants.  We actually can only
 142    do this if the FP formats of the target and host machines are the
 143    same, but we can't check that since not every file that uses
 144    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
 145    we can write the entry into the TOC and the entry is not larger
 146    than a TOC entry.  */
 147
 148 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
 149   (TARGET_TOC                                                           \
 150    && (GET_CODE (X) == SYMBOL_REF                                       \
 151        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
 152            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
 153        || GET_CODE (X) == LABEL_REF                                     \
 154        || (GET_CODE (X) == CONST_INT                                    \
 155            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
 156        || (GET_CODE (X) == CONST_DOUBLE                                 \
 157            && (TARGET_POWERPC64                                         \
 158                || TARGET_MINIMAL_TOC                                    \
 159                || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT          \
 160                    && ! TARGET_NO_FP_IN_TOC)))))
 161
 162 #define TARGET_ASM_GLOBALIZE_LABEL  rs6000_xcoff_asm_globalize_label
 163 #define TARGET_ASM_NAMED_SECTION  rs6000_xcoff_asm_named_section
 164 #define TARGET_ASM_SELECT_SECTION  rs6000_xcoff_select_section
 165 #define TARGET_ASM_SELECT_RTX_SECTION  rs6000_xcoff_select_rtx_section
 166 #define TARGET_ASM_UNIQUE_SECTION  rs6000_xcoff_unique_section
 167 #define TARGET_STRIP_NAME_ENCODING  rs6000_xcoff_strip_name_encoding
 168 #define TARGET_SECTION_TYPE_FLAGS  rs6000_xcoff_section_type_flags
 169
 170 /* FP save and restore routines.  */
 171 #define SAVE_FP_PREFIX "._savef"
 172 #define SAVE_FP_SUFFIX ""
 173 #define RESTORE_FP_PREFIX "._restf"
 174 #define RESTORE_FP_SUFFIX ""
 175
 176 /* Function name to call to do profiling.  */
 177 #undef  RS6000_MCOUNT
 178 #define RS6000_MCOUNT ".__mcount"
 179
 180 /* This outputs NAME to FILE up to the first null or '['.  */
 181
 182 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
 183   assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
 184
 185 /* This is how to output the definition of a user-level label named NAME,
 186    such as the label on a static function or variable NAME.  */
 187
 188 #define ASM_OUTPUT_LABEL(FILE,NAME)     \
 189   do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
 190
 191 /* This is how to output a command to make the user-level label named NAME
 192    defined for reference from other files.  */
 193
 194 /* Globalizing directive for a label.  */
 195 #define GLOBAL_ASM_OP "\t.globl "
 196
 197 #undef TARGET_ASM_FILE_START
 198 #define TARGET_ASM_FILE_START rs6000_xcoff_file_start
 199 #define TARGET_ASM_FILE_END rs6000_xcoff_file_end
 200 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
 201 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 202
 203 /* This macro produces the initial definition of a function name.
 204    On the RS/6000, we need to place an extra '.' in the function name and
 205    output the function descriptor.
 206
 207    The csect for the function will have already been created by the
 208    `text_section' call previously done.  We do have to go back to that
 209    csect, however.
 210
 211    The third and fourth parameters to the .function pseudo-op (16 and 044)
 212    are placeholders which no longer have any use.  */
 213
 214 #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL)               \
 215 { if (TREE_PUBLIC (DECL))                                       \
 216     {                                                           \
 217       if (!RS6000_WEAK || !DECL_WEAK (decl))                    \
 218         {                                                       \
 219           fputs ("\t.globl .", FILE);                           \
 220           RS6000_OUTPUT_BASENAME (FILE, NAME);                  \
 221           putc ('\n', FILE);                                    \
 222         }                                                       \
 223     }                                                           \
 224   else                                                          \
 225     {                                                           \
 226       fputs ("\t.lglobl .", FILE);                              \
 227       RS6000_OUTPUT_BASENAME (FILE, NAME);                      \
 228       putc ('\n', FILE);                                        \
 229     }                                                           \
 230   fputs ("\t.csect ", FILE);                                    \
 231   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 232   fputs (TARGET_32BIT ? "[DS]\n" : "[DS],3\n", FILE);           \
 233   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 234   fputs (":\n", FILE);                                          \
 235   fputs (TARGET_32BIT ? "\t.long ." : "\t.llong .", FILE);      \
 236   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 237   fputs (", TOC[tc0], 0\n", FILE);                              \
 238   in_section = no_section;                                      \
 239   function_section(DECL);                                       \
 240   putc ('.', FILE);                                             \
 241   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 242   fputs (":\n", FILE);                                          \
 243   if (write_symbols != NO_DEBUG)                                \
 244     xcoffout_declare_function (FILE, DECL, NAME);               \
 245 }
 246
 247 /* Output a reference to SYM on FILE.  */
 248
 249 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
 250   rs6000_output_symbol_ref (FILE, SYM)
 251
 252 /* This says how to output an external.  */
 253
 254 #undef  ASM_OUTPUT_EXTERNAL
 255 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 256 { rtx _symref = XEXP (DECL_RTL (DECL), 0);                              \
 257   if ((TREE_CODE (DECL) == VAR_DECL                                     \
 258        || TREE_CODE (DECL) == FUNCTION_DECL)                            \
 259       && (NAME)[strlen (NAME) - 1] != ']')                              \
 260     {                                                                   \
 261       XSTR (_symref, 0) = concat (XSTR (_symref, 0),                    \
 262                                   (TREE_CODE (DECL) == FUNCTION_DECL    \
 263                                    ? "[DS]" : "[RW]"),                  \
 264                                   NULL);                                \
 265     }                                                                   \
 266 }
 267
 268 /* This is how to output an internal label prefix.  rs6000.c uses this
 269    when generating traceback tables.  */
 270
 271 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 272   fprintf (FILE, "%s..", PREFIX)
 273
 274 /* This is how to output a label for a jump table.  Arguments are the same as
 275    for (*targetm.asm_out.internal_label), except the insn for the jump table is
 276    passed.  */
 277
 278 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 279 { ASM_OUTPUT_ALIGN (FILE, 2); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 280
 281 /* This is how to store into the string LABEL
 282    the symbol_ref name of an internal numbered label where
 283    PREFIX is the class of label and NUM is the number within the class.
 284    This is suitable for output with `assemble_name'.  */
 285
 286 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 287   sprintf (LABEL, "*%s..%u", (PREFIX), (unsigned) (NUM))
 288
 289 /* This is how to output an assembler line to define N characters starting
 290    at P to FILE.  */
 291
 292 #define ASM_OUTPUT_ASCII(FILE, P, N)  output_ascii ((FILE), (P), (N))
 293
 294 /* This is how to advance the location counter by SIZE bytes.  */
 295
 296 #define SKIP_ASM_OP "\t.space "
 297
 298 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 299   fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
 300
 301 /* This says how to output an assembler line
 302    to define a global common symbol.  */
 303
 304 #define COMMON_ASM_OP "\t.comm "
 305
 306 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)      \
 307   do { fputs (COMMON_ASM_OP, (FILE));                   \
 308        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 309        if ((ALIGN) > 32)                                \
 310          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE), \
 311                   exact_log2 ((ALIGN) / BITS_PER_UNIT)); \
 312        else if ((SIZE) > 4)                             \
 313          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",3\n", (SIZE)); \
 314        else                                             \
 315          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)); \
 316   } while (0)
 317
 318 /* This says how to output an assembler line
 319    to define a local common symbol.
 320    Alignment cannot be specified, but we can try to maintain
 321    alignment after preceding TOC section if it was aligned
 322    for 64-bit mode.  */
 323
 324 #define LOCAL_COMMON_ASM_OP "\t.lcomm "
 325
 326 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
 327   do { fputs (LOCAL_COMMON_ASM_OP, (FILE));             \
 328        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 329        fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s\n", \
 330                 (TARGET_32BIT ? (SIZE) : (ROUNDED)),    \
 331                 xcoff_bss_section_name);                \
 332      } while (0)
 333
 334 /* This is how we tell the assembler that two symbols have the same value.  */
 335 #define SET_ASM_OP "\t.set "
 336
 337 /* This is how we tell the assembler to equate two values.  */
 338 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 339  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 340         RS6000_OUTPUT_BASENAME (FILE, LABEL1);                          \
 341         fprintf (FILE, ",");                                            \
 342         RS6000_OUTPUT_BASENAME (FILE, LABEL2);                          \
 343         fprintf (FILE, "\n");                                           \
 344   } while (0)
 345
 346 /* Used by rs6000_assemble_integer, among others.  */
 347 #define DOUBLE_INT_ASM_OP "\t.llong\t"
 348
 349 /* Output before instructions.  */
 350 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
 351
 352 /* Output before writable data.
 353    Align entire section to BIGGEST_ALIGNMENT.  */
 354 #define DATA_SECTION_ASM_OP "\t.csect .data[RW],3"
 355
 356 /* Define the name of the section to use for the EH language specific
 357    data areas (.gcc_except_table on most other systems).  */
 358 #define TARGET_ASM_EXCEPTION_SECTION data_section
 359
 360 /* Define to prevent DWARF2 unwind info in the data section rather
 361    than in the .eh_frame section.  We do this because the AIX linker
 362    would otherwise garbage collect these sections.  */
 363 #define EH_FRAME_IN_DATA_SECTION 1