1 /* Output variables, constants and external declarations, for GNU compiler. 2 Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2004 3 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 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public 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 COPYING. If not, write to 19 the Free Software Foundation, 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #define TARGET_OBJECT_SUFFIX ".obj" 23 #define TARGET_EXECUTABLE_SUFFIX ".exe" 24 25 /* This enables certain macros in alpha.h, which will make an indirect 26 reference to an external symbol an invalid address. This needs to be 27 defined before we include alpha.h, since it determines which macros 28 are used for GO_IF_*. */ 29 30 #define NO_EXTERNAL_INDIRECT_ADDRESS 31 32 #define TARGET_OS_CPP_BUILTINS() \ 33 do { \ 34 builtin_define_std ("vms"); \ 35 builtin_define_std ("VMS"); \ 36 builtin_define ("__ALPHA"); \ 37 builtin_assert ("system=vms"); \ 38 if (TARGET_FLOAT_VAX) \ 39 builtin_define ("__G_FLOAT"); \ 40 else \ 41 builtin_define ("__IEEE_FLOAT"); \ 42 } while (0) 43 44 #undef TARGET_DEFAULT 45 #define TARGET_DEFAULT (MASK_FP|MASK_FPREGS|MASK_GAS) 46 #undef TARGET_ABI_OPEN_VMS 47 #define TARGET_ABI_OPEN_VMS 1 48 49 #undef TARGET_NAME 50 #define TARGET_NAME "OpenVMS/Alpha" 51 #undef TARGET_VERSION 52 #define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME); 53 54 #undef PCC_STATIC_STRUCT_RETURN 55 56 /* "long" is 32 bits, but 64 bits for Ada. */ 57 #undef LONG_TYPE_SIZE 58 #define LONG_TYPE_SIZE 32 59 #define ADA_LONG_TYPE_SIZE 64 60 61 /* Pointer is 32 bits but the hardware has 64-bit addresses, sign extended. */ 62 #undef POINTER_SIZE 63 #define POINTER_SIZE 32 64 #define POINTERS_EXTEND_UNSIGNED 0 65 66 #define MAX_OFILE_ALIGNMENT 524288 /* 8 x 2^16 by DEC Ada Test CD40VRA */ 67 68 #undef FIXED_REGISTERS 69 #define FIXED_REGISTERS \ 70 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 71 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \ 72 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 73 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 } 74 75 #undef CALL_USED_REGISTERS 76 #define CALL_USED_REGISTERS \ 77 {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 78 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ 79 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \ 80 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 } 81 82 /* List the order in which to allocate registers. Each register must be 83 listed once, even those in FIXED_REGISTERS. 84 85 We allocate in the following order: 86 $f1 (nonsaved floating-point register) 87 $f10-$f15 (likewise) 88 $f22-$f30 (likewise) 89 $f21-$f16 (likewise, but input args) 90 $f0 (nonsaved, but return value) 91 $f2-$f9 (saved floating-point registers) 92 $1 (nonsaved integer registers) 93 $22-$25 (likewise) 94 $28 (likewise) 95 $0 (likewise, but return value) 96 $21-$16 (likewise, but input args) 97 $27 (procedure value in OSF, nonsaved in NT) 98 $2-$8 (saved integer registers) 99 $9-$14 (saved integer registers) 100 $26 (return PC) 101 $15 (frame pointer) 102 $29 (global pointer) 103 $30, $31, $f31 (stack pointer and always zero/ap & fp) */ 104 105 #undef REG_ALLOC_ORDER 106 #define REG_ALLOC_ORDER \ 107 {33, \ 108 42, 43, 44, 45, 46, 47, \ 109 54, 55, 56, 57, 58, 59, 60, 61, 62, \ 110 53, 52, 51, 50, 49, 48, \ 111 32, \ 112 34, 35, 36, 37, 38, 39, 40, 41, \ 113 1, \ 114 22, 23, 24, 25, \ 115 28, \ 116 0, \ 117 21, 20, 19, 18, 17, 16, \ 118 27, \ 119 2, 3, 4, 5, 6, 7, 8, \ 120 9, 10, 11, 12, 13, 14, \ 121 26, \ 122 15, \ 123 29, \ 124 30, 31, 63 } 125 126 #undef HARD_FRAME_POINTER_REGNUM 127 #define HARD_FRAME_POINTER_REGNUM 29 128 129 /* Define registers used by the epilogue and return instruction. */ 130 #undef EPILOGUE_USES 131 #define EPILOGUE_USES(REGNO) ((REGNO) == 26 || (REGNO) == 29) 132 133 #undef CAN_ELIMINATE 134 #define CAN_ELIMINATE(FROM, TO) \ 135 ((TO) != STACK_POINTER_REGNUM || ! alpha_using_fp ()) 136 137 #undef INITIAL_ELIMINATION_OFFSET 138 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ 139 { if ((FROM) == FRAME_POINTER_REGNUM) \ 140 (OFFSET) = alpha_sa_size () + alpha_pv_save_size (); \ 141 else if ((FROM) == ARG_POINTER_REGNUM) \ 142 (OFFSET) = (ALPHA_ROUND (alpha_sa_size () + alpha_pv_save_size () \ 143 + get_frame_size () \ 144 + current_function_pretend_args_size) \ 145 - current_function_pretend_args_size); \ 146 else \ 147 abort(); \ 148 if ((TO) == STACK_POINTER_REGNUM) \ 149 (OFFSET) += ALPHA_ROUND (current_function_outgoing_args_size); \ 150 } 151 152 /* Define a data type for recording info about an argument list 153 during the scan of that argument list. This data type should 154 hold all necessary information about the function itself 155 and about the args processed so far, enough to enable macros 156 such as FUNCTION_ARG to determine where the next arg should go. 157 158 On Alpha/VMS, this is a structure that contains the number of 159 arguments and, for each argument, the datatype of that argument. 160 161 The number of arguments is a number of words of arguments scanned so far. 162 Thus 6 or more means all following args should go on the stack. */ 163 164 enum avms_arg_type {I64, FF, FD, FG, FS, FT}; 165 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info; 166 167 #undef CUMULATIVE_ARGS 168 #define CUMULATIVE_ARGS avms_arg_info 169 170 /* Initialize a variable CUM of type CUMULATIVE_ARGS 171 for a call to a function whose data type is FNTYPE. 172 For a library call, FNTYPE is 0. */ 173 174 #undef INIT_CUMULATIVE_ARGS 175 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \ 176 (CUM).num_args = 0; \ 177 (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \ 178 (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64; 179 180 #undef FUNCTION_ARG_ADVANCE 181 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \ 182 if (MUST_PASS_IN_STACK (MODE, TYPE)) \ 183 (CUM).num_args += 6; \ 184 else \ 185 { \ 186 if ((CUM).num_args < 6) \ 187 (CUM).atypes[(CUM).num_args] = alpha_arg_type (MODE); \ 188 \ 189 (CUM).num_args += ALPHA_ARG_SIZE (MODE, TYPE, NAMED); \ 190 } 191 192 /* For an arg passed partly in registers and partly in memory, 193 this is the number of registers used. 194 For args passed entirely in registers or entirely in memory, zero. */ 195 196 #undef FUNCTION_ARG_PARTIAL_NREGS 197 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \ 198 ((CUM).num_args < 6 && 6 < (CUM).num_args \ 199 + ALPHA_ARG_SIZE (MODE, TYPE, NAMED) \ 200 ? 6 - (CUM).num_args : 0) 201 202 /* ABI has stack checking, but it's broken. */ 203 #undef STACK_CHECK_BUILTIN 204 #define STACK_CHECK_BUILTIN 0 205 206 #define LINK_SECTION_ASM_OP "\t.link" 207 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata" 208 #define LITERALS_SECTION_ASM_OP "\t.literals" 209 #define CTORS_SECTION_ASM_OP "\t.ctors" 210 #define DTORS_SECTION_ASM_OP "\t.dtors" 211 212 #undef EXTRA_SECTIONS 213 #define EXTRA_SECTIONS in_link, in_literals 214 215 #undef EXTRA_SECTION_FUNCTIONS 216 #define EXTRA_SECTION_FUNCTIONS \ 217 void \ 218 link_section (void) \ 219 { \ 220 if (in_section != in_link) \ 221 { \ 222 fprintf (asm_out_file, "%s\n", LINK_SECTION_ASM_OP); \ 223 in_section = in_link; \ 224 } \ 225 } \ 226 void \ 227 literals_section (void) \ 228 { \ 229 if (in_section != in_literals) \ 230 { \ 231 fprintf (asm_out_file, "%s\n", LITERALS_SECTION_ASM_OP); \ 232 in_section = in_literals; \ 233 } \ 234 } 235 236 extern void link_section (void); 237 extern void literals_section (void); 238 239 #undef ASM_OUTPUT_ADDR_DIFF_ELT 240 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) abort () 241 242 #undef ASM_OUTPUT_ADDR_VEC_ELT 243 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ 244 fprintf (FILE, "\t.quad $L%d\n", (VALUE)) 245 246 #undef CASE_VECTOR_MODE 247 #define CASE_VECTOR_MODE DImode 248 #undef CASE_VECTOR_PC_RELATIVE 249 250 #undef ASM_OUTPUT_CASE_LABEL 251 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \ 252 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); } 253 254 /* This says how to output assembler code to declare an 255 uninitialized external linkage data object. */ 256 257 #define COMMON_ASM_OP "\t.comm\t" 258 259 #undef ASM_OUTPUT_ALIGNED_COMMON 260 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 261 do { \ 262 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 263 assemble_name ((FILE), (NAME)); \ 264 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ 265 } while (0) 266 267 268 /* Output assembler code for a block containing the constant parts 269 of a trampoline, leaving space for the variable parts. 270 271 The trampoline should set the static chain pointer to value placed 272 into the trampoline and should branch to the specified routine. 273 Note that $27 has been set to the address of the trampoline, so we can 274 use it for addressability of the two data items. */ 275 276 #undef TRAMPOLINE_TEMPLATE 277 #define TRAMPOLINE_TEMPLATE(FILE) \ 278 { \ 279 fprintf (FILE, "\t.quad 0\n"); \ 280 fprintf (FILE, "\t.linkage __tramp\n"); \ 281 fprintf (FILE, "\t.quad 0\n"); \ 282 } 283 284 /* Length in units of the trampoline for entering a nested function. */ 285 286 #undef TRAMPOLINE_SIZE 287 #define TRAMPOLINE_SIZE 32 288 289 /* The alignment of a trampoline, in bits. */ 290 291 #undef TRAMPOLINE_ALIGNMENT 292 #define TRAMPOLINE_ALIGNMENT 64 293 294 /* Emit RTL insns to initialize the variable parts of a trampoline. 295 FNADDR is an RTX for the address of the function's pure code. 296 CXT is an RTX for the static chain value for the function. */ 297 298 #undef INITIALIZE_TRAMPOLINE 299 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \ 300 alpha_initialize_trampoline (TRAMP, FNADDR, CXT, 16, 24, -1) 301 302 /* Control how constructors and destructors are emitted. */ 303 #define TARGET_ASM_CONSTRUCTOR vms_asm_out_constructor 304 #define TARGET_ASM_DESTRUCTOR vms_asm_out_destructor 305 306 #undef SDB_DEBUGGING_INFO 307 #undef MIPS_DEBUGGING_INFO 308 #undef DBX_DEBUGGING_INFO 309 310 #define DWARF2_DEBUGGING_INFO 1 311 #define VMS_DEBUGGING_INFO 1 312 313 #define DWARF2_UNWIND_INFO 1 314 315 #undef EH_RETURN_HANDLER_RTX 316 #define EH_RETURN_HANDLER_RTX \ 317 gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8)) 318 319 #define LINK_EH_SPEC "vms-dwarf2eh.o%s " 320 321 #ifdef IN_LIBGCC2 322 #include <pdscdef.h> 323 324 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \ 325 do { \ 326 PDSCDEF *pv = *((PDSCDEF **) (CONTEXT)->reg [29]); \ 327 \ 328 if (pv && ((long) pv & 0x7) == 0) /* low bits 0 means address */ \ 329 pv = *(PDSCDEF **) pv; \ 330 \ 331 if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_STACK)) \ 332 { \ 333 int i, j; \ 334 \ 335 (FS)->cfa_offset = pv->pdsc$l_size; \ 336 (FS)->cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30; \ 337 (FS)->retaddr_column = 26; \ 338 (FS)->cfa_how = CFA_REG_OFFSET; \ 339 (FS)->regs.reg[27].loc.offset = -pv->pdsc$l_size; \ 340 (FS)->regs.reg[27].how = REG_SAVED_OFFSET; \ 341 (FS)->regs.reg[26].loc.offset \ 342 = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset); \ 343 (FS)->regs.reg[26].how = REG_SAVED_OFFSET; \ 344 \ 345 for (i = 0, j = 0; i < 32; i++) \ 346 if (1<<i & pv->pdsc$l_ireg_mask) \ 347 { \ 348 (FS)->regs.reg[i].loc.offset \ 349 = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset - 8 * ++j); \ 350 (FS)->regs.reg[i].how = REG_SAVED_OFFSET; \ 351 } \ 352 \ 353 goto SUCCESS; \ 354 } \ 355 else if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_REGISTER)) \ 356 { \ 357 (FS)->cfa_offset = pv->pdsc$l_size; \ 358 (FS)->cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30; \ 359 (FS)->retaddr_column = 26; \ 360 (FS)->cfa_how = CFA_REG_OFFSET; \ 361 (FS)->regs.reg[26].loc.reg = pv->pdsc$b_save_ra; \ 362 (FS)->regs.reg[26].how = REG_SAVED_REG; \ 363 (FS)->regs.reg[29].loc.reg = pv->pdsc$b_save_fp; \ 364 (FS)->regs.reg[29].how = REG_SAVED_REG; \ 365 \ 366 goto SUCCESS; \ 367 } \ 368 } while (0) 369 #endif 370 371 /* This is how to output an assembler line 372 that says to advance the location counter 373 to a multiple of 2**LOG bytes. */ 374 375 #undef ASM_OUTPUT_ALIGN 376 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 377 fprintf (FILE, "\t.align %d\n", LOG); 378 379 /* Switch into a generic section. */ 380 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section 381 382 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \ 383 do { literals_section(); \ 384 fprintf ((FILE), "\t"); \ 385 assemble_name (FILE, LABEL1); \ 386 fprintf (FILE, " = "); \ 387 assemble_name (FILE, LABEL2); \ 388 fprintf (FILE, "\n"); \ 389 } while (0) 390 391 #undef PREFERRED_DEBUGGING_TYPE 392 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG 393 394 #define ASM_PN_FORMAT "%s___%lu" 395 396 /* ??? VMS uses different linkage. */ 397 #undef TARGET_ASM_OUTPUT_MI_THUNK 398 399 #undef ASM_SPEC 400 #undef ASM_FINAL_SPEC 401 402 /* The VMS convention is to always provide minimal debug info 403 for a traceback unless specifically overridden. Defaulting this here 404 is a kludge. */ 405 406 #define OPTIMIZATION_OPTIONS(OPTIMIZE, OPTIMIZE_SIZE) \ 407 { \ 408 write_symbols = VMS_DEBUG; \ 409 debug_info_level = (enum debug_info_level) 1; \ 410 } 411 412 /* Override traceback debug info on -g0. */ 413 #undef OVERRIDE_OPTIONS 414 #define OVERRIDE_OPTIONS \ 415 { \ 416 if (write_symbols == NO_DEBUG) \ 417 debug_info_level = (enum debug_info_level) 0; \ 418 override_options (); \ 419 } 420 421 /* Link with vms-dwarf2.o if -g (except -g0). This causes the 422 VMS link to pull all the dwarf2 debug sections together. */ 423 #undef LINK_SPEC 424 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \ 425 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}" 426 427 #undef STARTFILE_SPEC 428 #define STARTFILE_SPEC "%{!shared:%{mvms-return-codes:vcrt0.o%s} \ 429 %{!mvms-return-codes:pcrt0.o%s}}" 430 431 #undef LIB_SPEC 432 #define LIB_SPEC "-lc" 433 434 #define NAME__MAIN "__gccmain" 435 #define SYMBOL__MAIN __gccmain 436 437 #define MD_EXEC_PREFIX "/gnu/lib/gcc-lib/" 438 #define MD_STARTFILE_PREFIX "/gnu/lib/gcc-lib/" 439 440 /* Specify the list of include file directories. */ 441 #define INCLUDE_DEFAULTS \ 442 { \ 443 { "/gnu/lib/gcc-lib/include", 0, 0, 0 }, \ 444 { "/gnu_gxx_include", 0, 1, 1 }, \ 445 { "/gnu_cc_include", 0, 0, 0 }, \ 446 { "/gnu/include", 0, 0, 0 }, \ 447 { 0, 0, 0, 0 } \ 448 } 449 450 #define LONGLONG_STANDALONE 1 451