1 /* Definitions of target machine for GNU compiler, 2 for some generic XCOFF file format 3 Copyright (C) 2001-2020 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 && (SYMBOL_REF_P (X) \ 79 || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS \ 80 && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0))) \ 81 || GET_CODE (X) == LABEL_REF \ 82 || (CONST_INT_P (X) \ 83 && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode)) \ 84 || (CONST_DOUBLE_P (X) \ 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) 316 317