1 /* Output variables, constants and external declarations, for GNU compiler. 2 Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 3 2009 4 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 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3, or (at your option) 11 any later version. 12 13 GCC is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public 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_SUFFIX ".obj" 23 #define TARGET_EXECUTABLE_SUFFIX ".exe" 24 25 /* Alpha/VMS object format is not really Elf, but this makes compiling 26 crtstuff.c and dealing with shared library initialization much easier. */ 27 #define OBJECT_FORMAT_ELF 28 29 /* This enables certain macros in alpha.h, which will make an indirect 30 reference to an external symbol an invalid address. This needs to be 31 defined before we include alpha.h, since it determines which macros 32 are used for GO_IF_*. */ 33 34 #define NO_EXTERNAL_INDIRECT_ADDRESS 35 36 #define TARGET_OS_CPP_BUILTINS() \ 37 do { \ 38 builtin_define_std ("vms"); \ 39 builtin_define_std ("VMS"); \ 40 builtin_define ("__ALPHA"); \ 41 builtin_assert ("system=vms"); \ 42 if (TARGET_FLOAT_VAX) \ 43 builtin_define ("__G_FLOAT"); \ 44 else \ 45 builtin_define ("__IEEE_FLOAT"); \ 46 } while (0) 47 48 #undef TARGET_DEFAULT 49 #define TARGET_DEFAULT (MASK_FPREGS|MASK_GAS) 50 #undef TARGET_ABI_OPEN_VMS 51 #define TARGET_ABI_OPEN_VMS 1 52 53 #undef TARGET_NAME 54 #define TARGET_NAME "OpenVMS/Alpha" 55 #undef TARGET_VERSION 56 #define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME); 57 58 #define VMS_DEBUG_MAIN_POINTER "TRANSFER$BREAK$GO" 59 60 #undef PCC_STATIC_STRUCT_RETURN 61 62 /* "long" is 32 bits, but 64 bits for Ada. */ 63 #undef LONG_TYPE_SIZE 64 #define LONG_TYPE_SIZE 32 65 #define ADA_LONG_TYPE_SIZE 64 66 67 /* Pointer is 32 bits but the hardware has 64-bit addresses, sign extended. */ 68 #undef POINTER_SIZE 69 #define POINTER_SIZE 32 70 #define POINTERS_EXTEND_UNSIGNED 0 71 72 #define HANDLE_SYSV_PRAGMA 1 73 74 #define MAX_OFILE_ALIGNMENT 524288 /* 8 x 2^16 by DEC Ada Test CD40VRA */ 75 76 /* The maximum alignment 'malloc' honors. */ 77 #undef MALLOC_ALIGNMENT 78 #define MALLOC_ALIGNMENT ((TARGET_MALLOC64 ? 16 : 8) * BITS_PER_UNIT) 79 80 #undef FIXED_REGISTERS 81 #define FIXED_REGISTERS \ 82 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 83 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \ 84 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 85 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 } 86 87 #undef CALL_USED_REGISTERS 88 #define CALL_USED_REGISTERS \ 89 {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ 90 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ 91 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \ 92 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 } 93 94 /* List the order in which to allocate registers. Each register must be 95 listed once, even those in FIXED_REGISTERS. 96 97 We allocate in the following order: 98 $f1 (nonsaved floating-point register) 99 $f10-$f15 (likewise) 100 $f22-$f30 (likewise) 101 $f21-$f16 (likewise, but input args) 102 $f0 (nonsaved, but return value) 103 $f2-$f9 (saved floating-point registers) 104 $1 (nonsaved integer registers) 105 $22-$25 (likewise) 106 $28 (likewise) 107 $0 (likewise, but return value) 108 $21-$16 (likewise, but input args) 109 $27 (procedure value in OSF, nonsaved in NT) 110 $2-$8 (saved integer registers) 111 $9-$14 (saved integer registers) 112 $26 (return PC) 113 $15 (frame pointer) 114 $29 (global pointer) 115 $30, $31, $f31 (stack pointer and always zero/ap & fp) */ 116 117 #undef REG_ALLOC_ORDER 118 #define REG_ALLOC_ORDER \ 119 {33, \ 120 42, 43, 44, 45, 46, 47, \ 121 54, 55, 56, 57, 58, 59, 60, 61, 62, \ 122 53, 52, 51, 50, 49, 48, \ 123 32, \ 124 34, 35, 36, 37, 38, 39, 40, 41, \ 125 1, \ 126 22, 23, 24, 25, \ 127 28, \ 128 0, \ 129 21, 20, 19, 18, 17, 16, \ 130 27, \ 131 2, 3, 4, 5, 6, 7, 8, \ 132 9, 10, 11, 12, 13, 14, \ 133 26, \ 134 15, \ 135 29, \ 136 30, 31, 63 } 137 138 #undef HARD_FRAME_POINTER_REGNUM 139 #define HARD_FRAME_POINTER_REGNUM 29 140 141 /* Define registers used by the epilogue and return instruction. */ 142 #undef EPILOGUE_USES 143 #define EPILOGUE_USES(REGNO) ((REGNO) == 26 || (REGNO) == 29) 144 145 #undef INITIAL_ELIMINATION_OFFSET 146 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ 147 ((OFFSET) = alpha_vms_initial_elimination_offset(FROM, TO)) 148 149 150 /* Define a data type for recording info about an argument list 151 during the scan of that argument list. This data type should 152 hold all necessary information about the function itself 153 and about the args processed so far, enough to enable macros 154 such as FUNCTION_ARG to determine where the next arg should go. 155 156 On Alpha/VMS, this is a structure that contains the number of 157 arguments and, for each argument, the datatype of that argument. 158 159 The number of arguments is a number of words of arguments scanned so far. 160 Thus 6 or more means all following args should go on the stack. */ 161 162 enum avms_arg_type {I64, FF, FD, FG, FS, FT}; 163 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info; 164 165 #undef CUMULATIVE_ARGS 166 #define CUMULATIVE_ARGS avms_arg_info 167 168 /* Initialize a variable CUM of type CUMULATIVE_ARGS 169 for a call to a function whose data type is FNTYPE. 170 For a library call, FNTYPE is 0. */ 171 172 #undef INIT_CUMULATIVE_ARGS 173 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \ 174 (CUM).num_args = 0; \ 175 (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \ 176 (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64; 177 178 #undef FUNCTION_ARG_ADVANCE 179 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \ 180 if (targetm.calls.must_pass_in_stack (MODE, TYPE)) \ 181 (CUM).num_args += 6; \ 182 else \ 183 { \ 184 if ((CUM).num_args < 6) \ 185 (CUM).atypes[(CUM).num_args] = alpha_arg_type (MODE); \ 186 \ 187 (CUM).num_args += ALPHA_ARG_SIZE (MODE, TYPE, NAMED); \ 188 } 189 190 #define DEFAULT_PCC_STRUCT_RETURN 0 191 192 #undef ASM_WEAKEN_LABEL 193 #define ASM_WEAKEN_LABEL(FILE, NAME) \ 194 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ 195 fputc ('\n', FILE); } while (0) 196 197 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata" 198 #define CTORS_SECTION_ASM_OP "\t.ctors" 199 #define DTORS_SECTION_ASM_OP "\t.dtors" 200 #define SDATA_SECTION_ASM_OP "\t.sdata" 201 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ 202 asm (SECTION_OP "\n\t.long " #FUNC"\n"); 203 204 #undef ASM_OUTPUT_ADDR_DIFF_ELT 205 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) gcc_unreachable () 206 207 #undef ASM_OUTPUT_ADDR_VEC_ELT 208 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \ 209 fprintf (FILE, "\t.quad $L%d\n", (VALUE)) 210 211 #undef CASE_VECTOR_MODE 212 #define CASE_VECTOR_MODE DImode 213 #undef CASE_VECTOR_PC_RELATIVE 214 215 #undef ASM_OUTPUT_CASE_LABEL 216 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \ 217 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); } 218 219 /* This says how to output assembler code to declare an 220 uninitialized external linkage data object. */ 221 222 #define COMMON_ASM_OP "\t.comm\t" 223 224 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON 225 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \ 226 vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN) 227 228 /* Control how constructors and destructors are emitted. */ 229 #define TARGET_ASM_CONSTRUCTOR vms_asm_out_constructor 230 #define TARGET_ASM_DESTRUCTOR vms_asm_out_destructor 231 232 #undef SDB_DEBUGGING_INFO 233 #undef MIPS_DEBUGGING_INFO 234 #undef DBX_DEBUGGING_INFO 235 236 #define DWARF2_DEBUGGING_INFO 1 237 #define VMS_DEBUGGING_INFO 1 238 239 #define DWARF2_UNWIND_INFO 1 240 241 #undef EH_RETURN_HANDLER_RTX 242 #define EH_RETURN_HANDLER_RTX \ 243 gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8)) 244 245 #define LINK_EH_SPEC "vms-dwarf2eh.o%s " 246 #define LINK_GCC_C_SEQUENCE_SPEC "%G" 247 248 #ifdef IN_LIBGCC2 249 /* Get the definition for MD_FALLBACK_FRAME_STATE_FOR from a separate 250 file. This avoids having to recompile the world instead of libgcc only 251 when changes to this macro are exercised. */ 252 253 #define MD_UNWIND_SUPPORT "config/alpha/vms-unwind.h" 254 #endif 255 256 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ 257 avms_asm_output_external (FILE, DECL, NAME) 258 259 typedef struct crtl_name_spec 260 { 261 const char *const name; 262 const char *deccname; 263 int referenced; 264 } crtl_name_spec; 265 266 #include "config/vms/vms-crtl.h" 267 268 /* Alias CRTL names to 32/64bit DECCRTL functions. 269 Fixme: This should do a binary search. */ 270 #define DO_CRTL_NAMES \ 271 do \ 272 { \ 273 int i; \ 274 static crtl_name_spec vms_crtl_names[] = CRTL_NAMES; \ 275 static int malloc64_init = 0; \ 276 \ 277 if ((malloc64_init == 0) && TARGET_MALLOC64) \ 278 { \ 279 for (i=0; vms_crtl_names [i].name; i++) \ 280 { \ 281 if (strcmp ("calloc", vms_crtl_names [i].name) == 0) \ 282 vms_crtl_names [i].deccname = "decc$_calloc64"; \ 283 else \ 284 if (strcmp ("malloc", vms_crtl_names [i].name) == 0) \ 285 vms_crtl_names [i].deccname = "decc$_malloc64"; \ 286 else \ 287 if (strcmp ("realloc", vms_crtl_names [i].name) == 0) \ 288 vms_crtl_names [i].deccname = "decc$_realloc64"; \ 289 else \ 290 if (strcmp ("strdup", vms_crtl_names [i].name) == 0) \ 291 vms_crtl_names [i].deccname = "decc$_strdup64"; \ 292 } \ 293 malloc64_init = 1; \ 294 } \ 295 for (i=0; vms_crtl_names [i].name; i++) \ 296 if (!vms_crtl_names [i].referenced && \ 297 (strcmp (name, vms_crtl_names [i].name) == 0)) \ 298 { \ 299 fprintf (file, "\t%s=%s\n", \ 300 name, vms_crtl_names [i].deccname); \ 301 vms_crtl_names [i].referenced = 1; \ 302 } \ 303 } while (0) 304 305 /* This is how to output an assembler line 306 that says to advance the location counter 307 to a multiple of 2**LOG bytes. */ 308 309 #undef ASM_OUTPUT_ALIGN 310 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 311 fprintf (FILE, "\t.align %d\n", LOG); 312 313 /* Switch into a generic section. */ 314 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section 315 316 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \ 317 do { fprintf ((FILE), "\t.literals\n"); \ 318 in_section = NULL; \ 319 fprintf ((FILE), "\t"); \ 320 assemble_name (FILE, LABEL1); \ 321 fprintf (FILE, " = "); \ 322 assemble_name (FILE, LABEL2); \ 323 fprintf (FILE, "\n"); \ 324 } while (0) 325 326 #undef PREFERRED_DEBUGGING_TYPE 327 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG 328 329 #define ASM_PN_FORMAT "%s___%lu" 330 331 /* ??? VMS uses different linkage. */ 332 #undef TARGET_ASM_OUTPUT_MI_THUNK 333 334 #undef ASM_SPEC 335 #undef ASM_FINAL_SPEC 336 337 /* The VMS convention is to always provide minimal debug info 338 for a traceback unless specifically overridden. */ 339 340 #undef OVERRIDE_OPTIONS 341 #define OVERRIDE_OPTIONS \ 342 { \ 343 if (write_symbols == NO_DEBUG \ 344 && debug_info_level == DINFO_LEVEL_NONE) \ 345 { \ 346 write_symbols = VMS_DEBUG; \ 347 debug_info_level = DINFO_LEVEL_TERSE; \ 348 } \ 349 override_options (); \ 350 } 351 352 /* Link with vms-dwarf2.o if -g (except -g0). This causes the 353 VMS link to pull all the dwarf2 debug sections together. */ 354 #undef LINK_SPEC 355 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \ 356 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}" 357 358 #undef STARTFILE_SPEC 359 #define STARTFILE_SPEC \ 360 "%{!shared:%{mvms-return-codes:vcrt0.o%s} %{!mvms-return-codes:pcrt0.o%s} \ 361 crtbegin.o%s} \ 362 %{!static:%{shared:crtbeginS.o%s}}" 363 364 #define ENDFILE_SPEC \ 365 "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}" 366 367 #define NAME__MAIN "__gccmain" 368 #define SYMBOL__MAIN __gccmain 369 370 #define INIT_SECTION_ASM_OP "\t.section LIB$INITIALIZE,GBL,NOWRT" 371 372 #define LONGLONG_STANDALONE 1 373 374 #undef TARGET_VALID_POINTER_MODE 375 #define TARGET_VALID_POINTER_MODE vms_valid_pointer_mode 376