xcoff.h revision 1.5
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 int dollar_inside = 0; \ 159 strcpy (buffer, NAME); \ 160 p = strchr (buffer, '$'); \ 161 while (p) { \ 162 *p = '_'; \ 163 dollar_inside++; \ 164 p = strchr (p + 1, '$'); \ 165 } \ 166 if (dollar_inside) { \ 167 fputs ("\t.extern .", FILE); \ 168 RS6000_OUTPUT_BASENAME (FILE, buffer); \ 169 putc ('\n', FILE); \ 170 fprintf(FILE, "\t.rename .%s,\".%s\"\n", buffer, NAME); \ 171 } \ 172 } 173 174 /* This is how to output a reference to a user-level label named NAME. 175 `assemble_name' uses this. */ 176 177 #define ASM_OUTPUT_LABELREF(FILE,NAME) \ 178 asm_fprintf ((FILE), "%U%s", rs6000_xcoff_strip_dollar (NAME)); 179 180 /* This is how to output an internal label prefix. rs6000.c uses this 181 when generating traceback tables. */ 182 183 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \ 184 fprintf (FILE, "%s..", PREFIX) 185 186 /* This is how to output a label for a jump table. Arguments are the same as 187 for (*targetm.asm_out.internal_label), except the insn for the jump table is 188 passed. */ 189 190 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \ 191 { ASM_OUTPUT_ALIGN (FILE, 2); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); } 192 193 /* This is how to store into the string LABEL 194 the symbol_ref name of an internal numbered label where 195 PREFIX is the class of label and NUM is the number within the class. 196 This is suitable for output with `assemble_name'. */ 197 198 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ 199 sprintf (LABEL, "*%s..%u", rs6000_xcoff_strip_dollar (PREFIX), (unsigned) (NUM)) 200 201 /* This is how to output an assembler line to define N characters starting 202 at P to FILE. */ 203 204 #define ASM_OUTPUT_ASCII(FILE, P, N) output_ascii ((FILE), (P), (N)) 205 206 /* This is how to advance the location counter by SIZE bytes. */ 207 208 #define SKIP_ASM_OP "\t.space " 209 210 #define ASM_OUTPUT_SKIP(FILE,SIZE) \ 211 fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE)) 212 213 /* This says how to output an assembler line 214 to define a global common symbol. */ 215 216 #define COMMON_ASM_OP "\t.comm " 217 218 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 219 do { fputs (COMMON_ASM_OP, (FILE)); \ 220 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \ 221 if ((ALIGN) > 32) \ 222 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE), \ 223 floor_log2 ((ALIGN) / BITS_PER_UNIT)); \ 224 else if ((SIZE) > 4) \ 225 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",3\n", (SIZE)); \ 226 else \ 227 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)); \ 228 } while (0) 229 230 /* This says how to output an assembler line 231 to define a local common symbol. 232 The assembler in AIX 6.1 and later supports an alignment argument. 233 For earlier releases of AIX, we try to maintain 234 alignment after preceding TOC section if it was aligned 235 for 64-bit mode. */ 236 237 #define LOCAL_COMMON_ASM_OP "\t.lcomm " 238 239 #if TARGET_AIX_VERSION >= 61 240 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 241 do { fputs (LOCAL_COMMON_ASM_OP, (FILE)); \ 242 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \ 243 if ((ALIGN) > 32) \ 244 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s%u_,%u\n", \ 245 (SIZE), xcoff_bss_section_name, \ 246 floor_log2 ((ALIGN) / BITS_PER_UNIT), \ 247 floor_log2 ((ALIGN) / BITS_PER_UNIT)); \ 248 else if ((SIZE) > 4) \ 249 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s3_,3\n", \ 250 (SIZE), xcoff_bss_section_name); \ 251 else \ 252 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s,2\n", \ 253 (SIZE), xcoff_bss_section_name); \ 254 } while (0) 255 #endif 256 257 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 258 do { fputs (LOCAL_COMMON_ASM_OP, (FILE)); \ 259 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \ 260 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s\n", \ 261 (TARGET_32BIT ? (SIZE) : (ROUNDED)), \ 262 xcoff_bss_section_name); \ 263 } while (0) 264 265 #ifdef HAVE_AS_TLS 266 #define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE) \ 267 do { fputs(COMMON_ASM_OP, (FILE)); \ 268 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \ 269 fprintf ((FILE), "[UL],"HOST_WIDE_INT_PRINT_UNSIGNED"\n", \ 270 (SIZE)); \ 271 } while (0) 272 #endif 273 274 /* This is how we tell the assembler that two symbols have the same value. */ 275 #define SET_ASM_OP "\t.set " 276 277 /* This is how we tell the assembler to equate two values. 278 The semantic of AIX assembler's .set do not correspond to middle-end expectations. 279 We output aliases as alternative symbols in the front of the definition 280 via DECLARE_FUNCTION_NAME and DECLARE_OBJECT_NAME. 281 We still need to define this macro to let middle-end know that aliases are 282 supported. 283 */ 284 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) do { } while (0) 285 286 /* Used by rs6000_assemble_integer, among others. */ 287 288 /* Used by rs6000_assemble_integer, among others. */ 289 #define DOUBLE_INT_ASM_OP "\t.llong\t" 290 291 /* Output before instructions. */ 292 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]" 293 294 /* Output before writable data. */ 295 #define DATA_SECTION_ASM_OP \ 296 "\t.csect .data[RW]," XCOFF_CSECT_DEFAULT_ALIGNMENT_STR 297 298 299 /* Define to prevent DWARF2 unwind info in the data section rather 300 than in the .eh_frame section. We do this because the AIX linker 301 would otherwise garbage collect these sections. */ 302 #define EH_FRAME_IN_DATA_SECTION 1 303 304 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 305 306
Indexes created Sun Mar 22 00:23:16 UTC 2026