gcc/config/rs6000/xcoff.h

   1 /* Definitions of target machine for GNU compiler,
   2    for some generic XCOFF file format
   3    Copyright (C) 2001-2015 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 3, 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 COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #define TARGET_OBJECT_FORMAT OBJECT_XCOFF
  22
  23 /* The RS/6000 uses the XCOFF format.  */
  24 #define XCOFF_DEBUGGING_INFO 1
  25
  26 /* Define if the object format being used is COFF or a superset.  */
  27 #define OBJECT_FORMAT_COFF
  28
  29 /* Define the magic numbers that we recognize as COFF.
  30
  31     AIX 4.3 adds U803XTOCMAGIC (0757) for 64-bit objects and AIX V5 adds
  32     U64_TOCMAGIC (0767), but collect2.c does not include files in the
  33     correct order to conditionally define the symbolic name in this macro.
  34
  35     The AIX linker accepts import/export files as object files,
  36     so accept "#!" (0x2321) magic number.  */
  37 #define MY_ISCOFF(magic) \
  38   ((magic) == U802WRMAGIC || (magic) == U802ROMAGIC \
  39    || (magic) == U802TOCMAGIC || (magic) == 0757 || (magic) == 0767 \
  40    || (magic) == 0x2321)
  41
  42 /* We don't have GAS for the RS/6000 yet, so don't write out special
  43     .stabs in cc1plus.  */
  44
  45 #define FASCIST_ASSEMBLER
  46
  47 /* We define this to prevent the name mangler from putting dollar signs into
  48    function names.  */
  49
  50 #define NO_DOLLAR_IN_LABEL
  51
  52 /* We define this to 0 so that gcc will never accept a dollar sign in a
  53    variable name.  This is needed because the AIX assembler will not accept
  54    dollar signs.  */
  55
  56 #define DOLLARS_IN_IDENTIFIERS 0
  57
  58 /* AIX .align pseudo-op accept value from 0 to 12, corresponding to
  59    log base 2 of the alignment in bytes; 12 = 4096 bytes = 32768 bits.  */
  60
  61 #define MAX_OFILE_ALIGNMENT 32768
  62
  63 /* Default alignment factor for csect directives, chosen to honor
  64    BIGGEST_ALIGNMENT.  */
  65 #define XCOFF_CSECT_DEFAULT_ALIGNMENT_STR "4"
  66
  67 /* Return nonzero if this entry is to be written into the constant
  68    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
  69    or a CONST containing one of them.  If -mfp-in-toc (the default),
  70    we also do this for floating-point constants.  We actually can only
  71    do this if the FP formats of the target and host machines are the
  72    same, but we can't check that since not every file that uses these
  73    target macros includes real.h.  We also do this when we can write the
  74    entry into the TOC and the entry is not larger than a TOC entry.  */
  75
  76 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
  77   (TARGET_TOC                                                           \
  78    && (GET_CODE (X) == SYMBOL_REF                                       \
  79        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
  80            && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)           \
  81        || GET_CODE (X) == LABEL_REF                                     \
  82        || (GET_CODE (X) == CONST_INT                                    \
  83            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
  84        || (GET_CODE (X) == CONST_DOUBLE                                 \
  85            && (TARGET_MINIMAL_TOC                                       \
  86                || (SCALAR_FLOAT_MODE_P (GET_MODE (X))                   \
  87                    && ! TARGET_NO_FP_IN_TOC)))))
  88
  89 #define TARGET_ASM_OUTPUT_ANCHOR  rs6000_xcoff_asm_output_anchor
  90 #define TARGET_ASM_GLOBALIZE_LABEL  rs6000_xcoff_asm_globalize_label
  91 #define TARGET_ASM_INIT_SECTIONS  rs6000_xcoff_asm_init_sections
  92 #define TARGET_ASM_RELOC_RW_MASK  rs6000_xcoff_reloc_rw_mask
  93 #define TARGET_ASM_NAMED_SECTION  rs6000_xcoff_asm_named_section
  94 #define TARGET_ASM_SELECT_SECTION  rs6000_xcoff_select_section
  95 #define TARGET_ASM_SELECT_RTX_SECTION  rs6000_xcoff_select_rtx_section
  96 #define TARGET_ASM_UNIQUE_SECTION  rs6000_xcoff_unique_section
  97 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
  98 #define TARGET_STRIP_NAME_ENCODING  rs6000_xcoff_strip_name_encoding
  99 #define TARGET_SECTION_TYPE_FLAGS  rs6000_xcoff_section_type_flags
 100 #ifdef HAVE_AS_TLS
 101 #define TARGET_ENCODE_SECTION_INFO rs6000_xcoff_encode_section_info
 102 #endif
 103
 104 /* FP save and restore routines.  */
 105 #define SAVE_FP_PREFIX "._savef"
 106 #define SAVE_FP_SUFFIX ""
 107 #define RESTORE_FP_PREFIX "._restf"
 108 #define RESTORE_FP_SUFFIX ""
 109
 110 /* Function name to call to do profiling.  */
 111 #undef  RS6000_MCOUNT
 112 #define RS6000_MCOUNT ".__mcount"
 113
 114 /* This outputs NAME to FILE up to the first null or '['.  */
 115
 116 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
 117   assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
 118
 119 /* This is how to output the definition of a user-level label named NAME,
 120    such as the label on a static function or variable NAME.  */
 121
 122 #define ASM_OUTPUT_LABEL(FILE,NAME)     \
 123   do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
 124
 125 /* This is how to output a command to make the user-level label named NAME
 126    defined for reference from other files.  */
 127
 128 /* Globalizing directive for a label.  */
 129 #define GLOBAL_ASM_OP "\t.globl "
 130
 131 #undef TARGET_ASM_FILE_START
 132 #define TARGET_ASM_FILE_START rs6000_xcoff_file_start
 133 #define TARGET_ASM_FILE_END rs6000_xcoff_file_end
 134 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
 135 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 136
 137 /* This macro produces the initial definition of a function name.  */
 138
 139 #undef ASM_DECLARE_FUNCTION_NAME
 140 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 141   rs6000_xcoff_declare_function_name ((FILE), (NAME), (DECL))
 142 #undef ASM_DECLARE_OBJECT_NAME
 143 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 144   rs6000_xcoff_declare_object_name ((FILE), (NAME), (DECL))
 145
 146 /* Output a reference to SYM on FILE.  */
 147
 148 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
 149   rs6000_output_symbol_ref (FILE, SYM)
 150
 151 /* This says how to output an external.
 152    Dollar signs are converted to underscores.  */
 153
 154 #undef  ASM_OUTPUT_EXTERNAL
 155 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 156 { char *buffer = (char *) alloca (strlen (NAME) + 1);                   \
 157   char *p;                                                              \
 158   rtx _symref = XEXP (DECL_RTL (DECL), 0);                              \
 159   int dollar_inside = 0;                                                \
 160   strcpy (buffer, NAME);                                                \
 161   p = strchr (buffer, '$');                                             \
 162   while (p) {                                                           \
 163     *p = '_';                                                           \
 164     dollar_inside++;                                                    \
 165     p = strchr (p + 1, '$');                                            \
 166   }                                                                     \
 167   if (dollar_inside) {                                                  \
 168       fputs ("\t.extern .", FILE);                                      \
 169       RS6000_OUTPUT_BASENAME (FILE, buffer);                            \
 170       putc ('\n', FILE);                                                \
 171       fprintf(FILE, "\t.rename .%s,\".%s\"\n", buffer, NAME);           \
 172     }                                                                   \
 173   if ((TREE_CODE (DECL) == VAR_DECL                                     \
 174        || TREE_CODE (DECL) == FUNCTION_DECL)                            \
 175       && (NAME)[strlen (NAME) - 1] != ']')                              \
 176     {                                                                   \
 177       XSTR (_symref, 0) = concat (XSTR (_symref, 0),                    \
 178                                   (TREE_CODE (DECL) == FUNCTION_DECL    \
 179                                    ? "[DS]" : "[RW]"),                  \
 180                                   NULL);                                \
 181     }                                                                   \
 182 }
 183
 184 /* This is how to output a reference to a user-level label named NAME.
 185    `assemble_name' uses this.  */
 186
 187 #define ASM_OUTPUT_LABELREF(FILE,NAME)  \
 188   asm_fprintf ((FILE), "%U%s", rs6000_xcoff_strip_dollar (NAME));
 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", rs6000_xcoff_strip_dollar (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                   floor_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    The assembler in AIX 6.1 and later supports an alignment argument.
 243    For earlier releases of AIX, we try to maintain
 244    alignment after preceding TOC section if it was aligned
 245    for 64-bit mode.  */
 246
 247 #define LOCAL_COMMON_ASM_OP "\t.lcomm "
 248
 249 #if TARGET_AIX_VERSION >= 61
 250 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)       \
 251   do { fputs (LOCAL_COMMON_ASM_OP, (FILE));                     \
 252        RS6000_OUTPUT_BASENAME ((FILE), (NAME));                 \
 253        if ((ALIGN) > 32)                                        \
 254          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s%u_,%u\n", \
 255                   (SIZE), xcoff_bss_section_name,                       \
 256                   floor_log2 ((ALIGN) / BITS_PER_UNIT),                 \
 257                   floor_log2 ((ALIGN) / BITS_PER_UNIT));                \
 258        else if ((SIZE) > 4)                                     \
 259          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s3_,3\n",   \
 260                   (SIZE), xcoff_bss_section_name);              \
 261        else                                                     \
 262          fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s,2\n",     \
 263                   (SIZE), xcoff_bss_section_name);              \
 264      } while (0)
 265 #endif
 266
 267 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
 268   do { fputs (LOCAL_COMMON_ASM_OP, (FILE));             \
 269        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 270        fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s\n", \
 271                 (TARGET_32BIT ? (SIZE) : (ROUNDED)),    \
 272                 xcoff_bss_section_name);                \
 273      } while (0)
 274
 275 #ifdef HAVE_AS_TLS
 276 #define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE)   \
 277   do { fputs(COMMON_ASM_OP, (FILE));                    \
 278        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 279        fprintf ((FILE), "[UL],"HOST_WIDE_INT_PRINT_UNSIGNED"\n", \
 280        (SIZE));                                         \
 281   } while (0)
 282 #endif
 283
 284 /* This is how we tell the assembler that two symbols have the same value.  */
 285 #define SET_ASM_OP "\t.set "
 286
 287 /* This is how we tell the assembler to equate two values.
 288    The semantic of AIX assembler's .set do not correspond to middle-end expectations.
 289    We output aliases as alternative symbols in the front of the definition
 290    via DECLARE_FUNCTION_NAME and DECLARE_OBJECT_NAME.
 291    We still need to define this macro to let middle-end know that aliases are
 292    supported.
 293  */
 294 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) do { } while (0)
 295
 296 /* Used by rs6000_assemble_integer, among others.  */
 297
 298 /* Used by rs6000_assemble_integer, among others.  */
 299 #define DOUBLE_INT_ASM_OP "\t.llong\t"
 300
 301 /* Output before instructions.  */
 302 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
 303
 304 /* Output before writable data.  */
 305 #define DATA_SECTION_ASM_OP \
 306   "\t.csect .data[RW]," XCOFF_CSECT_DEFAULT_ALIGNMENT_STR
 307
 308
 309 /* Define to prevent DWARF2 unwind info in the data section rather
 310    than in the .eh_frame section.  We do this because the AIX linker
 311    would otherwise garbage collect these sections.  */
 312 #define EH_FRAME_IN_DATA_SECTION 1
 313
 314 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 315