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, 2007, 2008,
   3    2009, 2010
   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 MAX_OFILE_ALIGNMENT 524288  /* 8 x 2^16 by DEC Ada Test CD40VRA */
  73
  74 /* The maximum alignment 'malloc' honors.  */
  75 #undef  MALLOC_ABI_ALIGNMENT
  76 #define MALLOC_ABI_ALIGNMENT ((TARGET_MALLOC64 ? 16 : 8) * BITS_PER_UNIT)
  77
  78 #undef FIXED_REGISTERS
  79 #define FIXED_REGISTERS  \
  80  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  81   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  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, 0, 0, 0, 0, 0, 1 }
  84
  85 #undef CALL_USED_REGISTERS
  86 #define CALL_USED_REGISTERS  \
  87  {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  88   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  89   1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  90   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
  91
  92 /* List the order in which to allocate registers.  Each register must be
  93    listed once, even those in FIXED_REGISTERS.
  94
  95    We allocate in the following order:
  96    $f1                  (nonsaved floating-point register)
  97    $f10-$f15            (likewise)
  98    $f22-$f30            (likewise)
  99    $f21-$f16            (likewise, but input args)
 100    $f0                  (nonsaved, but return value)
 101    $f2-$f9              (saved floating-point registers)
 102    $1                   (nonsaved integer registers)
 103    $22-$25              (likewise)
 104    $28                  (likewise)
 105    $0                   (likewise, but return value)
 106    $21-$16              (likewise, but input args)
 107    $27                  (procedure value in OSF, nonsaved in NT)
 108    $2-$8                (saved integer registers)
 109    $9-$14               (saved integer registers)
 110    $26                  (return PC)
 111    $15                  (frame pointer)
 112    $29                  (global pointer)
 113    $30, $31, $f31       (stack pointer and always zero/ap & fp)  */
 114
 115 #undef REG_ALLOC_ORDER
 116 #define REG_ALLOC_ORDER         \
 117   {33,                                  \
 118    42, 43, 44, 45, 46, 47,              \
 119    54, 55, 56, 57, 58, 59, 60, 61, 62,  \
 120    53, 52, 51, 50, 49, 48,              \
 121    32,                                  \
 122    34, 35, 36, 37, 38, 39, 40, 41,      \
 123    1,                                   \
 124    22, 23, 24, 25,                      \
 125    28,                                  \
 126    0,                                   \
 127    21, 20, 19, 18, 17, 16,              \
 128    27,                                  \
 129    2, 3, 4, 5, 6, 7, 8,                 \
 130    9, 10, 11, 12, 13, 14,               \
 131    26,                                  \
 132    15,                                  \
 133    29,                                  \
 134    30, 31, 63 }
 135
 136 #undef HARD_FRAME_POINTER_REGNUM
 137 #define HARD_FRAME_POINTER_REGNUM 29
 138
 139 /* Define registers used by the epilogue and return instruction.  */
 140 #undef EPILOGUE_USES
 141 #define EPILOGUE_USES(REGNO)    ((REGNO) == 26 || (REGNO) == 29)
 142
 143 #undef INITIAL_ELIMINATION_OFFSET
 144 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 145   ((OFFSET) = alpha_vms_initial_elimination_offset(FROM, TO))
 146
 147 \f
 148 /* Define a data type for recording info about an argument list
 149    during the scan of that argument list.  This data type should
 150    hold all necessary information about the function itself
 151    and about the args processed so far, enough to enable macros
 152    such as FUNCTION_ARG to determine where the next arg should go.
 153
 154    On Alpha/VMS, this is a structure that contains the number of
 155    arguments and, for each argument, the datatype of that argument.
 156
 157    The number of arguments is a number of words of arguments scanned so far.
 158    Thus 6 or more means all following args should go on the stack.  */
 159
 160 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
 161 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
 162
 163 #undef CUMULATIVE_ARGS
 164 #define CUMULATIVE_ARGS avms_arg_info
 165
 166 /* Initialize a variable CUM of type CUMULATIVE_ARGS
 167    for a call to a function whose data type is FNTYPE.
 168    For a library call, FNTYPE is 0.  */
 169
 170 #undef INIT_CUMULATIVE_ARGS
 171 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 172   (CUM).num_args = 0;                                           \
 173   (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64;    \
 174   (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
 175
 176 #define DEFAULT_PCC_STRUCT_RETURN 0
 177
 178 #undef  ASM_WEAKEN_LABEL
 179 #define ASM_WEAKEN_LABEL(FILE, NAME)                            \
 180    do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);  \
 181         fputc ('\n', FILE); } while (0)
 182
 183 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
 184 #define CTORS_SECTION_ASM_OP "\t.ctors"
 185 #define DTORS_SECTION_ASM_OP "\t.dtors"
 186 #define SDATA_SECTION_ASM_OP "\t.sdata"
 187 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)              \
 188    asm (SECTION_OP "\n\t.long " #FUNC"\n");
 189
 190 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 191 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) gcc_unreachable ()
 192
 193 #undef ASM_OUTPUT_ADDR_VEC_ELT
 194 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 195   fprintf (FILE, "\t.quad $L%d\n", (VALUE))
 196
 197 #undef CASE_VECTOR_MODE
 198 #define CASE_VECTOR_MODE DImode
 199 #undef CASE_VECTOR_PC_RELATIVE
 200
 201 #undef ASM_OUTPUT_CASE_LABEL
 202 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 203 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 204
 205 /* This says how to output assembler code to declare an
 206    uninitialized external linkage data object.  */
 207
 208 #define COMMON_ASM_OP "\t.comm\t"
 209
 210 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 211 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 212   vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
 213 \f
 214 /* Control how constructors and destructors are emitted.  */
 215 #define TARGET_ASM_CONSTRUCTOR  vms_asm_out_constructor
 216 #define TARGET_ASM_DESTRUCTOR   vms_asm_out_destructor
 217
 218 #undef SDB_DEBUGGING_INFO
 219 #undef MIPS_DEBUGGING_INFO
 220 #undef DBX_DEBUGGING_INFO
 221
 222 #define DWARF2_DEBUGGING_INFO 1
 223 #define VMS_DEBUGGING_INFO 1
 224
 225 #define DWARF2_UNWIND_INFO 1
 226
 227 #undef EH_RETURN_HANDLER_RTX
 228 #define EH_RETURN_HANDLER_RTX \
 229   gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8))
 230
 231 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
 232 #define LINK_GCC_C_SEQUENCE_SPEC "%G"
 233
 234 #ifdef IN_LIBGCC2
 235 /* Get the definition for MD_FALLBACK_FRAME_STATE_FOR from a separate
 236    file. This avoids having to recompile the world instead of libgcc only
 237    when changes to this macro are exercised.  */
 238
 239 #define MD_UNWIND_SUPPORT "config/alpha/vms-unwind.h"
 240 #endif
 241
 242 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
 243   avms_asm_output_external (FILE, DECL, NAME)
 244
 245 typedef struct crtl_name_spec
 246 {
 247   const char *const name;
 248   const char *deccname;
 249   int referenced;
 250 } crtl_name_spec;
 251
 252 #include "config/vms/vms-crtl.h"
 253
 254 /* Alias CRTL names to 32/64bit DECCRTL functions.
 255    Fixme: This should do a binary search.  */
 256 #define DO_CRTL_NAMES                                                      \
 257   do                                                                       \
 258     {                                                                      \
 259       int i;                                                               \
 260       static crtl_name_spec vms_crtl_names[] = CRTL_NAMES;                 \
 261       static int malloc64_init = 0;                                        \
 262                                                                            \
 263       if ((malloc64_init == 0) && TARGET_MALLOC64)                         \
 264         {                                                                  \
 265           for (i=0; vms_crtl_names [i].name; i++)                          \
 266             {                                                              \
 267               if (strcmp ("calloc", vms_crtl_names [i].name) == 0)         \
 268                 vms_crtl_names [i].deccname = "decc$_calloc64";            \
 269               else                                                         \
 270               if (strcmp ("malloc", vms_crtl_names [i].name) == 0)         \
 271                 vms_crtl_names [i].deccname = "decc$_malloc64";            \
 272               else                                                         \
 273               if (strcmp ("realloc", vms_crtl_names [i].name) == 0)        \
 274                 vms_crtl_names [i].deccname = "decc$_realloc64";           \
 275               else                                                         \
 276               if (strcmp ("strdup", vms_crtl_names [i].name) == 0)         \
 277                 vms_crtl_names [i].deccname = "decc$_strdup64";            \
 278             }                                                              \
 279             malloc64_init = 1;                                             \
 280         }                                                                  \
 281       for (i=0; vms_crtl_names [i].name; i++)                              \
 282         if (!vms_crtl_names [i].referenced &&                              \
 283             (strcmp (name, vms_crtl_names [i].name) == 0))                 \
 284           {                                                                \
 285             fprintf (file, "\t%s=%s\n",                        \
 286                      name, vms_crtl_names [i].deccname);                   \
 287             vms_crtl_names [i].referenced = 1;                             \
 288           }                                                                \
 289     } while (0)
 290
 291 /* This is how to output an assembler line
 292    that says to advance the location counter
 293    to a multiple of 2**LOG bytes.  */
 294
 295 #undef ASM_OUTPUT_ALIGN
 296 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 297     fprintf (FILE, "\t.align %d\n", LOG);
 298
 299 /* Switch into a generic section.  */
 300 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section
 301
 302 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 303   do {  fprintf ((FILE), "\t.literals\n");                              \
 304         in_section = NULL;                                              \
 305         fprintf ((FILE), "\t");                                         \
 306         assemble_name (FILE, LABEL1);                                   \
 307         fprintf (FILE, " = ");                                          \
 308         assemble_name (FILE, LABEL2);                                   \
 309         fprintf (FILE, "\n");                                           \
 310   } while (0)
 311
 312 #undef PREFERRED_DEBUGGING_TYPE
 313 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 314
 315 #define ASM_PN_FORMAT "%s___%lu"
 316
 317 /* ??? VMS uses different linkage.  */
 318 #undef TARGET_ASM_OUTPUT_MI_THUNK
 319
 320 #undef ASM_SPEC
 321 #undef ASM_FINAL_SPEC
 322
 323 /* The VMS convention is to always provide minimal debug info
 324    for a traceback unless specifically overridden.  */
 325
 326 #undef SUBTARGET_OVERRIDE_OPTIONS
 327 #define SUBTARGET_OVERRIDE_OPTIONS                  \
 328 do {                                                \
 329   if (write_symbols == NO_DEBUG                     \
 330       && debug_info_level == DINFO_LEVEL_NONE)      \
 331     {                                               \
 332       write_symbols = VMS_DEBUG;                    \
 333       debug_info_level = DINFO_LEVEL_TERSE;         \
 334     }                                               \
 335 } while (0)
 336
 337 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
 338    VMS link to pull all the dwarf2 debug sections together.  */
 339 #undef LINK_SPEC
 340 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \
 341 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}"
 342
 343 #undef STARTFILE_SPEC
 344 #define STARTFILE_SPEC \
 345 "%{!shared:%{mvms-return-codes:vcrt0.o%s} %{!mvms-return-codes:pcrt0.o%s} \
 346     crtbegin.o%s} \
 347  %{!static:%{shared:crtbeginS.o%s}}"
 348
 349 #define ENDFILE_SPEC \
 350 "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
 351
 352 #define NAME__MAIN "__gccmain"
 353 #define SYMBOL__MAIN __gccmain
 354
 355 #define INIT_SECTION_ASM_OP "\t.section LIB$INITIALIZE,GBL,NOWRT"
 356
 357 #define LONGLONG_STANDALONE 1
 358
 359 #undef TARGET_VALID_POINTER_MODE
 360 #define TARGET_VALID_POINTER_MODE vms_valid_pointer_mode