gcc/config/alpha/vms.h

   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 \f
 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 \f
 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