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, 2004 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, 51 Franklin Street, Fifth Floor, Boston,
  20    MA 02110-1301, 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 /* Return nonzero if this entry is to be written into the constant
  60    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
  61    or a CONST containing one of them.  If -mfp-in-toc (the default),
  62    we also do this for floating-point constants.  We actually can only
  63    do this if the FP formats of the target and host machines are the
  64    same, but we can't check that since not every file that uses
  65    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
  66    we can write the entry into the TOC and the entry is not larger
  67    than a TOC entry.  */
  68
  69 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
  70   (TARGET_TOC                                                           \
  71    && (GET_CODE (X) == SYMBOL_REF                                       \
  72        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
  73            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
  74        || GET_CODE (X) == LABEL_REF                                     \
  75        || (GET_CODE (X) == CONST_INT                                    \
  76            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
  77        || (GET_CODE (X) == CONST_DOUBLE                                 \
  78            && (TARGET_POWERPC64                                         \
  79                || TARGET_MINIMAL_TOC                                    \
  80                || (SCALAR_FLOAT_MODE_P (GET_MODE (X))                   \
  81                    && ! TARGET_NO_FP_IN_TOC)))))
  82
  83 #define TARGET_ASM_GLOBALIZE_LABEL  rs6000_xcoff_asm_globalize_label
  84 #define TARGET_ASM_INIT_SECTIONS  rs6000_xcoff_asm_init_sections
  85 #define TARGET_ASM_NAMED_SECTION  rs6000_xcoff_asm_named_section
  86 #define TARGET_ASM_SELECT_SECTION  rs6000_xcoff_select_section
  87 #define TARGET_ASM_SELECT_RTX_SECTION  rs6000_xcoff_select_rtx_section
  88 #define TARGET_ASM_UNIQUE_SECTION  rs6000_xcoff_unique_section
  89 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
  90 #define TARGET_STRIP_NAME_ENCODING  rs6000_xcoff_strip_name_encoding
  91 #define TARGET_SECTION_TYPE_FLAGS  rs6000_xcoff_section_type_flags
  92
  93 /* FP save and restore routines.  */
  94 #define SAVE_FP_PREFIX "._savef"
  95 #define SAVE_FP_SUFFIX ""
  96 #define RESTORE_FP_PREFIX "._restf"
  97 #define RESTORE_FP_SUFFIX ""
  98
  99 /* Function name to call to do profiling.  */
 100 #undef  RS6000_MCOUNT
 101 #define RS6000_MCOUNT ".__mcount"
 102
 103 /* This outputs NAME to FILE up to the first null or '['.  */
 104
 105 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
 106   assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
 107
 108 /* This is how to output the definition of a user-level label named NAME,
 109    such as the label on a static function or variable NAME.  */
 110
 111 #define ASM_OUTPUT_LABEL(FILE,NAME)     \
 112   do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
 113
 114 /* This is how to output a command to make the user-level label named NAME
 115    defined for reference from other files.  */
 116
 117 /* Globalizing directive for a label.  */
 118 #define GLOBAL_ASM_OP "\t.globl "
 119
 120 #undef TARGET_ASM_FILE_START
 121 #define TARGET_ASM_FILE_START rs6000_xcoff_file_start
 122 #define TARGET_ASM_FILE_END rs6000_xcoff_file_end
 123 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
 124 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 125
 126 /* This macro produces the initial definition of a function name.
 127    On the RS/6000, we need to place an extra '.' in the function name and
 128    output the function descriptor.
 129
 130    The csect for the function will have already been created when
 131    text_section was selected.  We do have to go back to that csect, however.
 132
 133    The third and fourth parameters to the .function pseudo-op (16 and 044)
 134    are placeholders which no longer have any use.  */
 135
 136 #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL)               \
 137 { if (TREE_PUBLIC (DECL))                                       \
 138     {                                                           \
 139       if (!RS6000_WEAK || !DECL_WEAK (decl))                    \
 140         {                                                       \
 141           fputs ("\t.globl .", FILE);                           \
 142           RS6000_OUTPUT_BASENAME (FILE, NAME);                  \
 143           putc ('\n', FILE);                                    \
 144         }                                                       \
 145     }                                                           \
 146   else                                                          \
 147     {                                                           \
 148       fputs ("\t.lglobl .", FILE);                              \
 149       RS6000_OUTPUT_BASENAME (FILE, NAME);                      \
 150       putc ('\n', FILE);                                        \
 151     }                                                           \
 152   fputs ("\t.csect ", FILE);                                    \
 153   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 154   fputs (TARGET_32BIT ? "[DS]\n" : "[DS],3\n", FILE);           \
 155   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 156   fputs (":\n", FILE);                                          \
 157   fputs (TARGET_32BIT ? "\t.long ." : "\t.llong .", FILE);      \
 158   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 159   fputs (", TOC[tc0], 0\n", FILE);                              \
 160   in_section = NULL;                                            \
 161   switch_to_section (function_section (DECL));                  \
 162   putc ('.', FILE);                                             \
 163   RS6000_OUTPUT_BASENAME (FILE, NAME);                          \
 164   fputs (":\n", FILE);                                          \
 165   if (write_symbols != NO_DEBUG)                                \
 166     xcoffout_declare_function (FILE, DECL, NAME);               \
 167 }
 168
 169 /* Output a reference to SYM on FILE.  */
 170
 171 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
 172   rs6000_output_symbol_ref (FILE, SYM)
 173
 174 /* This says how to output an external.  */
 175
 176 #undef  ASM_OUTPUT_EXTERNAL
 177 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 178 { rtx _symref = XEXP (DECL_RTL (DECL), 0);                              \
 179   if ((TREE_CODE (DECL) == VAR_DECL                                     \
 180        || TREE_CODE (DECL) == FUNCTION_DECL)                            \
 181       && (NAME)[strlen (NAME) - 1] != ']')                              \
 182     {                                                                   \
 183       XSTR (_symref, 0) = concat (XSTR (_symref, 0),                    \
 184                                   (TREE_CODE (DECL) == FUNCTION_DECL    \
 185                                    ? "[DS]" : "[RW]"),                  \
 186                                   NULL);                                \
 187     }                                                                   \
 188 }
 189
 190 /* This is how to output an internal label prefix.  rs6000.c uses this
 191    when generating traceback tables.  */
 192
 193 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 194   fprintf (FILE, "%s..", PREFIX)
 195
 196 /* This is how to output a label for a jump table.  Arguments are the same as
 197    for (*targetm.asm_out.internal_label), except the insn for the jump table is
 198    passed.  */
 199
 200 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 201 { ASM_OUTPUT_ALIGN (FILE, 2); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 202
 203 /* This is how to store into the string LABEL
 204    the symbol_ref name of an internal numbered label where
 205    PREFIX is the class of label and NUM is the number within the class.
 206    This is suitable for output with `assemble_name'.  */
 207
 208 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 209   sprintf (LABEL, "*%s..%u", (PREFIX), (unsigned) (NUM))
 210
 211 /* This is how to output an assembler line to define N characters starting
 212    at P to FILE.  */
 213
 214 #define ASM_OUTPUT_ASCII(FILE, P, N)  output_ascii ((FILE), (P), (N))
 215
 216 /* This is how to advance the location counter by SIZE bytes.  */
 217
 218 #define SKIP_ASM_OP "\t.space "
 219
 220 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 221   fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
 222
 223 /* This says how to output an assembler line
 224    to define a global common symbol.  */
 225
 226 #define COMMON_ASM_OP "\t.comm "
 227
 228 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)      \
 229   do { fputs (COMMON_ASM_OP, (FILE));                   \
 230        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 231        if ((ALIGN) > 32)                                \
 232          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE), \
 233                   exact_log2 ((ALIGN) / BITS_PER_UNIT)); \
 234        else if ((SIZE) > 4)                             \
 235          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",3\n", (SIZE)); \
 236        else                                             \
 237          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)); \
 238   } while (0)
 239
 240 /* This says how to output an assembler line
 241    to define a local common symbol.
 242    Alignment cannot be specified, but we can try to maintain
 243    alignment after preceding TOC section if it was aligned
 244    for 64-bit mode.  */
 245
 246 #define LOCAL_COMMON_ASM_OP "\t.lcomm "
 247
 248 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
 249   do { fputs (LOCAL_COMMON_ASM_OP, (FILE));             \
 250        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 251        fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s\n", \
 252                 (TARGET_32BIT ? (SIZE) : (ROUNDED)),    \
 253                 xcoff_bss_section_name);                \
 254      } while (0)
 255
 256 /* This is how we tell the assembler that two symbols have the same value.  */
 257 #define SET_ASM_OP "\t.set "
 258
 259 /* This is how we tell the assembler to equate two values.  */
 260 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 261  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 262         RS6000_OUTPUT_BASENAME (FILE, LABEL1);                          \
 263         fprintf (FILE, ",");                                            \
 264         RS6000_OUTPUT_BASENAME (FILE, LABEL2);                          \
 265         fprintf (FILE, "\n");                                           \
 266   } while (0)
 267
 268 /* Used by rs6000_assemble_integer, among others.  */
 269 #define DOUBLE_INT_ASM_OP "\t.llong\t"
 270
 271 /* Output before instructions.  */
 272 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
 273
 274 /* Output before writable data.
 275    Align entire section to BIGGEST_ALIGNMENT.  */
 276 #define DATA_SECTION_ASM_OP "\t.csect .data[RW],3"
 277
 278 /* Define to prevent DWARF2 unwind info in the data section rather
 279    than in the .eh_frame section.  We do this because the AIX linker
 280    would otherwise garbage collect these sections.  */
 281 #define EH_FRAME_IN_DATA_SECTION 1