gcc/config/powerpcspe/xcoff.h

   1 /* Definitions of target machine for GNU compiler,
   2    for some generic XCOFF file format
   3    Copyright (C) 2001-2017 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 #undef TARGET_DEBUG_UNWIND_INFO
  90 #define TARGET_DEBUG_UNWIND_INFO  rs6000_xcoff_debug_unwind_info
  91 #define TARGET_ASM_OUTPUT_ANCHOR  rs6000_xcoff_asm_output_anchor
  92 #define TARGET_ASM_GLOBALIZE_DECL_NAME  rs6000_xcoff_asm_globalize_decl_name
  93 #define TARGET_ASM_GLOBALIZE_LABEL  rs6000_xcoff_asm_globalize_label
  94 #define TARGET_ASM_INIT_SECTIONS  rs6000_xcoff_asm_init_sections
  95 #define TARGET_ASM_RELOC_RW_MASK  rs6000_xcoff_reloc_rw_mask
  96 #define TARGET_ASM_NAMED_SECTION  rs6000_xcoff_asm_named_section
  97 #define TARGET_ASM_SELECT_SECTION  rs6000_xcoff_select_section
  98 #define TARGET_ASM_SELECT_RTX_SECTION  rs6000_xcoff_select_rtx_section
  99 #define TARGET_ASM_UNIQUE_SECTION  rs6000_xcoff_unique_section
 100 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 101 #define TARGET_STRIP_NAME_ENCODING  rs6000_xcoff_strip_name_encoding
 102 #define TARGET_SECTION_TYPE_FLAGS  rs6000_xcoff_section_type_flags
 103 #ifdef HAVE_AS_TLS
 104 #define TARGET_ENCODE_SECTION_INFO rs6000_xcoff_encode_section_info
 105 #endif
 106 #define ASM_OUTPUT_ALIGNED_DECL_COMMON  rs6000_xcoff_asm_output_aligned_decl_common
 107
 108 /* FP save and restore routines.  */
 109 #define SAVE_FP_PREFIX "._savef"
 110 #define SAVE_FP_SUFFIX ""
 111 #define RESTORE_FP_PREFIX "._restf"
 112 #define RESTORE_FP_SUFFIX ""
 113
 114 /* Function name to call to do profiling.  */
 115 #undef  RS6000_MCOUNT
 116 #define RS6000_MCOUNT ".__mcount"
 117
 118 /* This outputs NAME to FILE up to the first null or '['.  */
 119
 120 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
 121   assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
 122
 123 /* This is how to output the definition of a user-level label named NAME,
 124    such as the label on a static function or variable NAME.  */
 125
 126 #define ASM_OUTPUT_LABEL(FILE,NAME)     \
 127   do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
 128
 129 /* This is how to output a command to make the user-level label named NAME
 130    defined for reference from other files.  */
 131
 132 /* Globalizing directive for a label.  */
 133 #define GLOBAL_ASM_OP "\t.globl "
 134
 135 #undef TARGET_ASM_FILE_START
 136 #define TARGET_ASM_FILE_START rs6000_xcoff_file_start
 137 #define TARGET_ASM_FILE_END rs6000_xcoff_file_end
 138 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
 139 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 140
 141 /* This macro produces the initial definition of a function name.  */
 142
 143 #undef ASM_DECLARE_FUNCTION_NAME
 144 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 145   rs6000_xcoff_declare_function_name ((FILE), (NAME), (DECL))
 146 #undef ASM_DECLARE_OBJECT_NAME
 147 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 148   rs6000_xcoff_declare_object_name ((FILE), (NAME), (DECL))
 149
 150 /* Output a reference to SYM on FILE.  */
 151
 152 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
 153   rs6000_output_symbol_ref (FILE, SYM)
 154
 155 /* This says how to output an external.
 156    Dollar signs are converted to underscores.  */
 157
 158 #undef  ASM_OUTPUT_EXTERNAL
 159 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 160 { char *buffer = (char *) alloca (strlen (NAME) + 1);                   \
 161   char *p;                                                              \
 162   int dollar_inside = 0;                                                \
 163   strcpy (buffer, NAME);                                                \
 164   p = strchr (buffer, '$');                                             \
 165   while (p) {                                                           \
 166     *p = '_';                                                           \
 167     dollar_inside++;                                                    \
 168     p = strchr (p + 1, '$');                                            \
 169   }                                                                     \
 170   if (dollar_inside) {                                                  \
 171       fputs ("\t.extern .", FILE);                                      \
 172       RS6000_OUTPUT_BASENAME (FILE, buffer);                            \
 173       putc ('\n', FILE);                                                \
 174       fprintf (FILE, "\t.rename .%s,\".%s\"\n", buffer, NAME);          \
 175     }                                                                   \
 176 }
 177
 178 /* This is how to output a reference to a user-level label named NAME.
 179    `assemble_name' uses this.  */
 180
 181 #define ASM_OUTPUT_LABELREF(FILE,NAME)  \
 182   asm_fprintf ((FILE), "%U%s", rs6000_xcoff_strip_dollar (NAME));
 183
 184 /* This is how to output an internal label prefix.  rs6000.c uses this
 185    when generating traceback tables.  */
 186
 187 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 188   fprintf (FILE, "%s..", PREFIX)
 189
 190 /* This is how to output a label for a jump table.  Arguments are the same as
 191    for (*targetm.asm_out.internal_label), except the insn for the jump table is
 192    passed.  */
 193
 194 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 195 { ASM_OUTPUT_ALIGN (FILE, 2); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 196
 197 /* This is how to store into the string LABEL
 198    the symbol_ref name of an internal numbered label where
 199    PREFIX is the class of label and NUM is the number within the class.
 200    This is suitable for output with `assemble_name'.  */
 201
 202 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 203   sprintf (LABEL, "*%s..%u", rs6000_xcoff_strip_dollar (PREFIX), (unsigned) (NUM))
 204
 205 /* This is how to output an assembler line to define N characters starting
 206    at P to FILE.  */
 207
 208 #define ASM_OUTPUT_ASCII(FILE, P, N)  output_ascii ((FILE), (P), (N))
 209
 210 /* This is how to advance the location counter by SIZE bytes.  */
 211
 212 #define SKIP_ASM_OP "\t.space "
 213
 214 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 215   fprintf (FILE, "%s" HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
 216
 217 /* This says how to output an assembler line
 218    to define a global common symbol.  */
 219
 220 #define COMMON_ASM_OP "\t.comm "
 221
 222 /* This says how to output an assembler line
 223    to define a local common symbol.
 224    The assembler in AIX 6.1 and later supports an alignment argument.
 225    For earlier releases of AIX, we try to maintain
 226    alignment after preceding TOC section if it was aligned
 227    for 64-bit mode.  */
 228
 229 #define LOCAL_COMMON_ASM_OP "\t.lcomm "
 230
 231 #if TARGET_AIX_VERSION >= 61
 232 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)       \
 233   do { fputs (LOCAL_COMMON_ASM_OP, (FILE));                     \
 234        RS6000_OUTPUT_BASENAME ((FILE), (NAME));                 \
 235        if ((ALIGN) > 32)                                        \
 236          fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%s%u_,%u\n",        \
 237                   (SIZE), xcoff_bss_section_name,                       \
 238                   floor_log2 ((ALIGN) / BITS_PER_UNIT),                 \
 239                   floor_log2 ((ALIGN) / BITS_PER_UNIT));                \
 240        else if ((SIZE) > 4)                                     \
 241          fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%s3_,3\n",  \
 242                   (SIZE), xcoff_bss_section_name);              \
 243        else                                                     \
 244          fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%s,2\n",    \
 245                   (SIZE), xcoff_bss_section_name);              \
 246      } while (0)
 247 #endif
 248
 249 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
 250   do { fputs (LOCAL_COMMON_ASM_OP, (FILE));             \
 251        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 252        fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%s\n", \
 253                 (TARGET_32BIT ? (SIZE) : (ROUNDED)),    \
 254                 xcoff_bss_section_name);                \
 255      } while (0)
 256
 257 #ifdef HAVE_AS_TLS
 258 #define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE)   \
 259   do { fputs (COMMON_ASM_OP, (FILE));                   \
 260        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 261        fprintf ((FILE), "[UL]," HOST_WIDE_INT_PRINT_UNSIGNED"\n", \
 262        (SIZE));                                         \
 263   } while (0)
 264 #endif
 265
 266 /* This is how we tell the assembler that two symbols have the same value.  */
 267 #define SET_ASM_OP "\t.set "
 268
 269 /* This is how we tell the assembler to equate two values.
 270    The semantic of AIX assembler's .set do not correspond to middle-end expectations.
 271    We output aliases as alternative symbols in the front of the definition
 272    via DECLARE_FUNCTION_NAME and DECLARE_OBJECT_NAME.
 273    We still need to define this macro to let middle-end know that aliases are
 274    supported.
 275  */
 276 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) do { } while (0)
 277
 278 /* Used by rs6000_assemble_integer, among others.  */
 279
 280 /* Used by rs6000_assemble_integer, among others.  */
 281 #define DOUBLE_INT_ASM_OP "\t.llong\t"
 282
 283 /* Output before instructions.  */
 284 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
 285
 286 /* Output before writable data.  */
 287 #define DATA_SECTION_ASM_OP \
 288   "\t.csect .data[RW]," XCOFF_CSECT_DEFAULT_ALIGNMENT_STR
 289
 290
 291 /* The eh_frames are put in the read-only text segment.
 292    Local code labels/function will also be in the local text segment so use
 293    PC relative addressing.
 294    Global symbols must be in the data segment to allow loader relocations.
 295    So use DW_EH_PE_indirect to allocate a slot in the local data segment.
 296    There is no constant offset to this data segment from the text segment,
 297    so use addressing relative to the data segment.
 298  */
 299 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
 300   (((GLOBAL) ? DW_EH_PE_indirect | DW_EH_PE_datarel : DW_EH_PE_pcrel) \
 301    | (TARGET_64BIT ? DW_EH_PE_sdata8 : DW_EH_PE_sdata4))
 302
 303 #define EH_FRAME_THROUGH_COLLECT2 1
 304 #define EH_TABLES_CAN_BE_READ_ONLY 1
 305
 306 /* AIX Assembler implicitly assumes DWARF 64 bit extension in 64 bit mode.  */
 307 #define DWARF_OFFSET_SIZE PTR_SIZE
 308
 309 #define ASM_OUTPUT_DWARF_PCREL(FILE,SIZE,LABEL) \
 310   rs6000_asm_output_dwarf_pcrel ((FILE), (SIZE), (LABEL));
 311
 312 #define ASM_OUTPUT_DWARF_DATAREL(FILE,SIZE,LABEL) \
 313   rs6000_asm_output_dwarf_datarel ((FILE), (SIZE), (LABEL));
 314
 315 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 316