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, 2005
   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, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, 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_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 { switch (FROM)                                                         \
 140     {                                                                   \
 141     case FRAME_POINTER_REGNUM:                                          \
 142       (OFFSET) = alpha_sa_size () + alpha_pv_save_size ();              \
 143       break;                                                            \
 144     case ARG_POINTER_REGNUM:                                            \
 145       (OFFSET) = (ALPHA_ROUND (alpha_sa_size () + alpha_pv_save_size () \
 146                                + get_frame_size ()                      \
 147                                + current_function_pretend_args_size)    \
 148                   - current_function_pretend_args_size);                \
 149       break;                                                            \
 150     default:                                                            \
 151       gcc_unreachable ();                                               \
 152     }                                                                   \
 153   if ((TO) == STACK_POINTER_REGNUM)                                     \
 154     (OFFSET) += ALPHA_ROUND (current_function_outgoing_args_size);      \
 155 }
 156 \f
 157 /* Define a data type for recording info about an argument list
 158    during the scan of that argument list.  This data type should
 159    hold all necessary information about the function itself
 160    and about the args processed so far, enough to enable macros
 161    such as FUNCTION_ARG to determine where the next arg should go.
 162
 163    On Alpha/VMS, this is a structure that contains the number of
 164    arguments and, for each argument, the datatype of that argument.
 165
 166    The number of arguments is a number of words of arguments scanned so far.
 167    Thus 6 or more means all following args should go on the stack.  */
 168
 169 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
 170 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
 171
 172 #undef CUMULATIVE_ARGS
 173 #define CUMULATIVE_ARGS avms_arg_info
 174
 175 /* Initialize a variable CUM of type CUMULATIVE_ARGS
 176    for a call to a function whose data type is FNTYPE.
 177    For a library call, FNTYPE is 0.  */
 178
 179 #undef INIT_CUMULATIVE_ARGS
 180 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 181   (CUM).num_args = 0;                                           \
 182   (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64;    \
 183   (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
 184
 185 #undef FUNCTION_ARG_ADVANCE
 186 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)                    \
 187   if (targetm.calls.must_pass_in_stack (MODE, TYPE))                    \
 188     (CUM).num_args += 6;                                                \
 189   else                                                                  \
 190     {                                                                   \
 191       if ((CUM).num_args < 6)                                           \
 192         (CUM).atypes[(CUM).num_args] = alpha_arg_type (MODE);           \
 193                                                                         \
 194      (CUM).num_args += ALPHA_ARG_SIZE (MODE, TYPE, NAMED);              \
 195     }
 196
 197 /* ABI has stack checking, but it's broken.  */
 198 #undef STACK_CHECK_BUILTIN
 199 #define STACK_CHECK_BUILTIN 0
 200
 201 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
 202 #define CTORS_SECTION_ASM_OP "\t.ctors"
 203 #define DTORS_SECTION_ASM_OP "\t.dtors"
 204
 205 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 206 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) gcc_unreachable ()
 207
 208 #undef ASM_OUTPUT_ADDR_VEC_ELT
 209 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 210   fprintf (FILE, "\t.quad $L%d\n", (VALUE))
 211
 212 #undef CASE_VECTOR_MODE
 213 #define CASE_VECTOR_MODE DImode
 214 #undef CASE_VECTOR_PC_RELATIVE
 215
 216 #undef ASM_OUTPUT_CASE_LABEL
 217 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 218 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 219
 220 /* This says how to output assembler code to declare an
 221    uninitialized external linkage data object.  */
 222
 223 #define COMMON_ASM_OP "\t.comm\t"
 224
 225 #undef ASM_OUTPUT_ALIGNED_COMMON
 226 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 227 do {                                                                    \
 228   fprintf ((FILE), "%s", COMMON_ASM_OP);                                \
 229   assemble_name ((FILE), (NAME));                                       \
 230   fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT);  \
 231 } while (0)
 232
 233 \f
 234 /* Output assembler code for a block containing the constant parts
 235    of a trampoline, leaving space for the variable parts.
 236
 237    The trampoline should set the static chain pointer to value placed
 238    into the trampoline and should branch to the specified routine.
 239    Note that $27 has been set to the address of the trampoline, so we can
 240    use it for addressability of the two data items.  */
 241
 242 #undef TRAMPOLINE_TEMPLATE
 243 #define TRAMPOLINE_TEMPLATE(FILE)               \
 244 {                                               \
 245   fprintf (FILE, "\t.quad 0\n");                \
 246   fprintf (FILE, "\t.linkage __tramp\n");       \
 247   fprintf (FILE, "\t.quad 0\n");                \
 248 }
 249
 250 /* Length in units of the trampoline for entering a nested function.  */
 251
 252 #undef TRAMPOLINE_SIZE
 253 #define TRAMPOLINE_SIZE    32
 254
 255 /* The alignment of a trampoline, in bits.  */
 256
 257 #undef TRAMPOLINE_ALIGNMENT
 258 #define TRAMPOLINE_ALIGNMENT  64
 259
 260 /* Emit RTL insns to initialize the variable parts of a trampoline.
 261    FNADDR is an RTX for the address of the function's pure code.
 262    CXT is an RTX for the static chain value for the function.  */
 263
 264 #undef INITIALIZE_TRAMPOLINE
 265 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
 266   alpha_initialize_trampoline (TRAMP, FNADDR, CXT, 16, 24, -1)
 267
 268 /* Control how constructors and destructors are emitted.  */
 269 #define TARGET_ASM_CONSTRUCTOR  vms_asm_out_constructor
 270 #define TARGET_ASM_DESTRUCTOR   vms_asm_out_destructor
 271
 272 #undef SDB_DEBUGGING_INFO
 273 #undef MIPS_DEBUGGING_INFO
 274 #undef DBX_DEBUGGING_INFO
 275
 276 #define DWARF2_DEBUGGING_INFO 1
 277 #define VMS_DEBUGGING_INFO 1
 278
 279 #define DWARF2_UNWIND_INFO 1
 280
 281 #undef EH_RETURN_HANDLER_RTX
 282 #define EH_RETURN_HANDLER_RTX \
 283   gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8))
 284
 285 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
 286
 287 #define MD_UNWIND_SUPPORT "config/alpha/vms-unwind.h"
 288
 289 /* This is how to output an assembler line
 290    that says to advance the location counter
 291    to a multiple of 2**LOG bytes.  */
 292
 293 #undef ASM_OUTPUT_ALIGN
 294 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 295     fprintf (FILE, "\t.align %d\n", LOG);
 296
 297 /* Switch into a generic section.  */
 298 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section
 299
 300 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 301   do {  fprintf ((FILE), "\t.literals\n");                              \
 302         in_section = NULL;                                              \
 303         fprintf ((FILE), "\t");                                         \
 304         assemble_name (FILE, LABEL1);                                   \
 305         fprintf (FILE, " = ");                                          \
 306         assemble_name (FILE, LABEL2);                                   \
 307         fprintf (FILE, "\n");                                           \
 308   } while (0)
 309
 310 #undef PREFERRED_DEBUGGING_TYPE
 311 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 312
 313 #define ASM_PN_FORMAT "%s___%lu"
 314
 315 /* ??? VMS uses different linkage.  */
 316 #undef TARGET_ASM_OUTPUT_MI_THUNK
 317
 318 #undef ASM_SPEC
 319 #undef ASM_FINAL_SPEC
 320
 321 /* The VMS convention is to always provide minimal debug info
 322    for a traceback unless specifically overridden.  Defaulting this here
 323    is a kludge.  */
 324
 325 #define OPTIMIZATION_OPTIONS(OPTIMIZE, OPTIMIZE_SIZE) \
 326 {                                                  \
 327    write_symbols = VMS_DEBUG;                      \
 328    debug_info_level = (enum debug_info_level) 1;   \
 329 }
 330
 331 /* Override traceback debug info on -g0.  */
 332 #undef OVERRIDE_OPTIONS
 333 #define OVERRIDE_OPTIONS                           \
 334 {                                                  \
 335    if (write_symbols == NO_DEBUG)                  \
 336      debug_info_level = (enum debug_info_level) 0; \
 337    override_options ();                            \
 338 }
 339
 340 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
 341    VMS link to pull all the dwarf2 debug sections together.  */
 342 #undef LINK_SPEC
 343 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \
 344 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}"
 345
 346 #undef STARTFILE_SPEC
 347 #define STARTFILE_SPEC "%{!shared:%{mvms-return-codes:vcrt0.o%s} \
 348 %{!mvms-return-codes:pcrt0.o%s}}"
 349
 350 #undef LIB_SPEC
 351 #define LIB_SPEC "-lc"
 352
 353 #define NAME__MAIN "__gccmain"
 354 #define SYMBOL__MAIN __gccmain
 355
 356 #define MD_EXEC_PREFIX "/gnu/lib/gcc-lib/"
 357 #define MD_STARTFILE_PREFIX "/gnu/lib/gcc-lib/"
 358
 359 /* Specify the list of include file directories.  */
 360 #define INCLUDE_DEFAULTS                   \
 361 {                                          \
 362   { "/gnu/lib/gcc-lib/include", 0, 0, 0 }, \
 363   { "/gnu_gxx_include", 0, 1, 1 },         \
 364   { "/gnu_cc_include", 0, 0, 0 },          \
 365   { "/gnu/include", 0, 0, 0 },             \
 366   { 0, 0, 0, 0 }                           \
 367 }
 368
 369 #define LONGLONG_STANDALONE 1