gcc/config/rs6000/xcoff.h

   1 // SPDX-License-Identifier: GPL-3.0-or-later
   2 /* Definitions of target machine for GNU compiler,
   3    for some generic XCOFF file format
   4    Copyright (C) 2001-2024 Free Software Foundation, Inc.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  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.cc 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 /* AIX .align pseudo-op accept value from 0 to 12, corresponding to
  60    log base 2 of the alignment in bytes; 12 = 4096 bytes = 32768 bits.  */
  61
  62 #define MAX_OFILE_ALIGNMENT 32768
  63
  64 /* Default alignment factor for csect directives, chosen to honor
  65    BIGGEST_ALIGNMENT.  */
  66 #define XCOFF_CSECT_DEFAULT_ALIGNMENT_STR "4"
  67
  68 /* Return nonzero if this entry is to be written into the constant
  69    pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
  70    or a CONST containing one of them.  If -mfp-in-toc (the default),
  71    we also do this for floating-point constants.  We actually can only
  72    do this if the FP formats of the target and host machines are the
  73    same, but we can't check that since not every file that uses these
  74    target macros includes real.h.  We also do this when we can write the
  75    entry into the TOC and the entry is not larger than a TOC entry.  */
  76
  77 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)                        \
  78   (TARGET_TOC                                                           \
  79    && (SYMBOL_REF_P (X)                                                 \
  80        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS      \
  81            && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0)))                     \
  82        || GET_CODE (X) == LABEL_REF                                     \
  83        || (CONST_INT_P (X)                                              \
  84            && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))      \
  85        || (CONST_DOUBLE_P (X)                                           \
  86            && (TARGET_MINIMAL_TOC                                       \
  87                || (SCALAR_FLOAT_MODE_P (GET_MODE (X))                   \
  88                    && ! TARGET_NO_FP_IN_TOC)))))
  89
  90 #undef TARGET_DEBUG_UNWIND_INFO
  91 #define TARGET_DEBUG_UNWIND_INFO  rs6000_xcoff_debug_unwind_info
  92 #define TARGET_ASM_OUTPUT_ANCHOR  rs6000_xcoff_asm_output_anchor
  93 #define TARGET_ASM_GLOBALIZE_DECL_NAME  rs6000_xcoff_asm_globalize_decl_name
  94 #define TARGET_ASM_GLOBALIZE_LABEL  rs6000_xcoff_asm_globalize_label
  95 #define TARGET_ASM_INIT_SECTIONS  rs6000_xcoff_asm_init_sections
  96 #define TARGET_ASM_RELOC_RW_MASK  rs6000_xcoff_reloc_rw_mask
  97 #define TARGET_ASM_NAMED_SECTION  rs6000_xcoff_asm_named_section
  98 #define TARGET_ASM_SELECT_SECTION  rs6000_xcoff_select_section
  99 #define TARGET_ASM_SELECT_RTX_SECTION  rs6000_xcoff_select_rtx_section
 100 #define TARGET_ASM_UNIQUE_SECTION  rs6000_xcoff_unique_section
 101 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 102 #define TARGET_STRIP_NAME_ENCODING  rs6000_xcoff_strip_name_encoding
 103 #define TARGET_SECTION_TYPE_FLAGS  rs6000_xcoff_section_type_flags
 104 #ifdef HAVE_AS_TLS
 105 #define TARGET_ENCODE_SECTION_INFO rs6000_xcoff_encode_section_info
 106 #endif
 107 #define ASM_OUTPUT_ALIGNED_DECL_COMMON  rs6000_xcoff_asm_output_aligned_decl_common
 108 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL  rs6000_xcoff_asm_output_aligned_decl_common
 109 #define ASM_OUTPUT_ALIGNED_BSS  rs6000_xcoff_asm_output_aligned_decl_common
 110
 111 /* FP save and restore routines.  */
 112 #define SAVE_FP_PREFIX "._savef"
 113 #define SAVE_FP_SUFFIX ""
 114 #define RESTORE_FP_PREFIX "._restf"
 115 #define RESTORE_FP_SUFFIX ""
 116
 117 /* Function name to call to do profiling.  */
 118 #undef  RS6000_MCOUNT
 119 #define RS6000_MCOUNT ".__mcount"
 120
 121 /* This outputs NAME to FILE up to the first null or '['.  */
 122
 123 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
 124   assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
 125
 126 /* This is how to output the definition of a user-level label named NAME,
 127    such as the label on a static function or variable NAME.  */
 128
 129 #define ASM_OUTPUT_LABEL(FILE,NAME)     \
 130   do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
 131
 132 /* This is how to output a command to make the user-level label named NAME
 133    defined for reference from other files.  */
 134
 135 /* Globalizing directive for a label.  */
 136 #define GLOBAL_ASM_OP "\t.globl "
 137
 138 #undef TARGET_ASM_FILE_START
 139 #define TARGET_ASM_FILE_START rs6000_xcoff_file_start
 140 #define TARGET_ASM_FILE_END rs6000_xcoff_file_end
 141 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
 142 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 143
 144 /* This macro produces the initial definition of a function name.  */
 145
 146 #undef ASM_DECLARE_FUNCTION_NAME
 147 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 148   rs6000_xcoff_declare_function_name ((FILE), (NAME), (DECL))
 149 #undef ASM_DECLARE_OBJECT_NAME
 150 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 151   rs6000_xcoff_declare_object_name ((FILE), (NAME), (DECL))
 152
 153 /* Output a reference to SYM on FILE.  */
 154
 155 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
 156   rs6000_output_symbol_ref (FILE, SYM)
 157
 158 /* This says how to output an external.
 159    Dollar signs are converted to underscores.  */
 160
 161 #undef  ASM_OUTPUT_EXTERNAL
 162 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 163 { char *buffer = (char *) alloca (strlen (NAME) + 1);                   \
 164   char *p;                                                              \
 165   int dollar_inside = 0;                                                \
 166   strcpy (buffer, NAME);                                                \
 167   p = strchr (buffer, '$');                                             \
 168   while (p) {                                                           \
 169     *p = '_';                                                           \
 170     dollar_inside++;                                                    \
 171     p = strchr (p + 1, '$');                                            \
 172   }                                                                     \
 173   if (dollar_inside) {                                                  \
 174       fputs ("\t.extern .", FILE);                                      \
 175       RS6000_OUTPUT_BASENAME (FILE, buffer);                            \
 176       putc ('\n', FILE);                                                \
 177       fprintf (FILE, "\t.rename .%s,\".%s\"\n", buffer, NAME);          \
 178     }                                                                   \
 179 }
 180
 181 /* This is how to output a reference to a user-level label named NAME.
 182    `assemble_name' uses this.  */
 183
 184 #define ASM_OUTPUT_LABELREF(FILE,NAME)  \
 185   asm_fprintf ((FILE), "%U%s", rs6000_xcoff_strip_dollar (NAME))
 186
 187 /* This is how to output an internal label prefix.  rs6000.cc uses this
 188    when generating traceback tables.  */
 189
 190 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 191   fprintf (FILE, "%s..", PREFIX)
 192
 193 /* This is how to output a label for a jump table.  Arguments are the same as
 194    for (*targetm.asm_out.internal_label), except the insn for the jump table is
 195    passed.  */
 196
 197 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 198 { ASM_OUTPUT_ALIGN (FILE, 2); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 199
 200 /* This is how to store into the string LABEL
 201    the symbol_ref name of an internal numbered label where
 202    PREFIX is the class of label and NUM is the number within the class.
 203    This is suitable for output with `assemble_name'.  */
 204
 205 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 206   sprintf (LABEL, "*%s..%u", rs6000_xcoff_strip_dollar (PREFIX), (unsigned) (NUM))
 207
 208 /* This is how to output an assembler line to define N characters starting
 209    at P to FILE.  */
 210
 211 #define ASM_OUTPUT_ASCII(FILE, P, N)  output_ascii ((FILE), (P), (N))
 212
 213 /* This is how to advance the location counter by SIZE bytes.  */
 214
 215 #define SKIP_ASM_OP "\t.space "
 216
 217 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 218   fprintf (FILE, "%s" HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
 219
 220 /* This says how to output an assembler line
 221    to define a global common symbol.  */
 222
 223 #define COMMON_ASM_OP "\t.comm "
 224 #define LOCAL_COMMON_ASM_OP "\t.lcomm "
 225
 226 #ifdef HAVE_AS_TLS
 227 #define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE)   \
 228   do { \
 229        rs6000_xcoff_asm_output_aligned_decl_common ((FILE), (DECL), (NAME), (SIZE), 0); \
 230   } while (0)
 231 #endif
 232
 233 /* This is how we tell the assembler that two symbols have the same value.  */
 234 #define SET_ASM_OP "\t.set "
 235
 236 /* This is how we tell the assembler to equate two values.
 237    The semantic of AIX assembler's .set do not correspond to middle-end expectations.
 238    We output aliases as alternative symbols in the front of the definition
 239    via DECLARE_FUNCTION_NAME and DECLARE_OBJECT_NAME.
 240    We still need to define this macro to let middle-end know that aliases are
 241    supported.
 242  */
 243 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) do { (void) (FILE);  \
 244                                                 (void) (LABEL1); \
 245                                                 (void) (LABEL2); } while (0)
 246
 247 /* Used by rs6000_assemble_integer, among others.  */
 248
 249 /* Used by rs6000_assemble_integer, among others.  */
 250 #define DOUBLE_INT_ASM_OP "\t.llong\t"
 251
 252 /* Output before instructions.  */
 253 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR],5"
 254
 255 /* Output before writable data.  */
 256 #define DATA_SECTION_ASM_OP \
 257   "\t.csect .data[RW]," XCOFF_CSECT_DEFAULT_ALIGNMENT_STR
 258
 259
 260 /* The eh_frames are put in the read-only text segment.
 261    Local code labels/function will also be in the local text segment so use
 262    PC relative addressing.
 263    Global symbols must be in the data segment to allow loader relocations.
 264    So use DW_EH_PE_indirect to allocate a slot in the local data segment.
 265    There is no constant offset to this data segment from the text segment,
 266    so use addressing relative to the data segment.
 267  */
 268 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
 269   (((GLOBAL) ? DW_EH_PE_indirect | DW_EH_PE_datarel : DW_EH_PE_pcrel) \
 270    | (TARGET_64BIT ? DW_EH_PE_sdata8 : DW_EH_PE_sdata4))
 271
 272 #define EH_FRAME_THROUGH_COLLECT2 1
 273 #define EH_TABLES_CAN_BE_READ_ONLY 1
 274
 275 /* AIX Assembler implicitly assumes DWARF 64 bit extension in 64 bit mode.  */
 276 #define DWARF_OFFSET_SIZE PTR_SIZE
 277
 278 #define ASM_OUTPUT_DWARF_PCREL(FILE,SIZE,LABEL) \
 279   rs6000_asm_output_dwarf_pcrel ((FILE), (SIZE), (LABEL));
 280
 281 #define ASM_OUTPUT_DWARF_DATAREL(FILE,SIZE,LABEL) \
 282   rs6000_asm_output_dwarf_datarel ((FILE), (SIZE), (LABEL));
 283
 284 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 285