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, 2011
   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 /* Alpha/VMS object format is not really Elf, but this makes compiling
  23    crtstuff.c and dealing with shared library initialization much easier.  */
  24 #define OBJECT_FORMAT_ELF
  25
  26 /* Do not use TM clone registry as it currently doesn't work.  Alpha/VMS
  27    object is too far from ELF for supporting TM out of the box.  */
  28 #define USE_TM_CLONE_REGISTRY 0
  29
  30 /* This enables certain macros in alpha.h, which will make an indirect
  31    reference to an external symbol an invalid address.  This needs to be
  32    defined before we include alpha.h, since it determines which macros
  33    are used for GO_IF_*.  */
  34
  35 #define NO_EXTERNAL_INDIRECT_ADDRESS
  36
  37 #define SUBTARGET_OS_CPP_BUILTINS()             \
  38     do {                                        \
  39       builtin_define ("__ALPHA");               \
  40       if (TARGET_FLOAT_VAX)                     \
  41         builtin_define ("__G_FLOAT");           \
  42       else                                      \
  43         builtin_define ("__IEEE_FLOAT");        \
  44     } while (0)
  45
  46 #undef TARGET_DEFAULT
  47 #if POINTER_SIZE == 64
  48 #define TARGET_DEFAULT (MASK_FPREGS | MASK_GAS | MASK_MALLOC64)
  49 #else
  50 #define TARGET_DEFAULT (MASK_FPREGS | MASK_GAS)
  51 #endif
  52
  53 #define VMS_DEBUG_MAIN_POINTER "TRANSFER$BREAK$GO"
  54
  55 #undef PCC_STATIC_STRUCT_RETURN
  56
  57 #define MAX_OFILE_ALIGNMENT 524288  /* 8 x 2^16 by DEC Ada Test CD40VRA */
  58
  59 /* The maximum alignment 'malloc' honors.  */
  60 #undef  MALLOC_ABI_ALIGNMENT
  61 #define MALLOC_ABI_ALIGNMENT ((TARGET_MALLOC64 ? 16 : 8) * BITS_PER_UNIT)
  62
  63 #undef FIXED_REGISTERS
  64 #define FIXED_REGISTERS  \
  65  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  66   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  67   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  68   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
  69
  70 #undef CALL_USED_REGISTERS
  71 #define CALL_USED_REGISTERS  \
  72  {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  73   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  74   1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  75   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
  76
  77 /* List the order in which to allocate registers.  Each register must be
  78    listed once, even those in FIXED_REGISTERS.
  79
  80    We allocate in the following order:
  81    $f1                  (nonsaved floating-point register)
  82    $f10-$f15            (likewise)
  83    $f22-$f30            (likewise)
  84    $f21-$f16            (likewise, but input args)
  85    $f0                  (nonsaved, but return value)
  86    $f2-$f9              (saved floating-point registers)
  87    $1                   (nonsaved integer registers)
  88    $22-$25              (likewise)
  89    $28                  (likewise)
  90    $0                   (likewise, but return value)
  91    $21-$16              (likewise, but input args)
  92    $27                  (procedure value in OSF, nonsaved in NT)
  93    $2-$8                (saved integer registers)
  94    $9-$14               (saved integer registers)
  95    $26                  (return PC)
  96    $15                  (frame pointer)
  97    $29                  (global pointer)
  98    $30, $31, $f31       (stack pointer and always zero/ap & fp)  */
  99
 100 #undef REG_ALLOC_ORDER
 101 #define REG_ALLOC_ORDER         \
 102   {33,                                  \
 103    42, 43, 44, 45, 46, 47,              \
 104    54, 55, 56, 57, 58, 59, 60, 61, 62,  \
 105    53, 52, 51, 50, 49, 48,              \
 106    32,                                  \
 107    34, 35, 36, 37, 38, 39, 40, 41,      \
 108    1,                                   \
 109    22, 23, 24, 25,                      \
 110    28,                                  \
 111    0,                                   \
 112    21, 20, 19, 18, 17, 16,              \
 113    27,                                  \
 114    2, 3, 4, 5, 6, 7, 8,                 \
 115    9, 10, 11, 12, 13, 14,               \
 116    26,                                  \
 117    15,                                  \
 118    29,                                  \
 119    30, 31, 63 }
 120
 121 #undef HARD_FRAME_POINTER_REGNUM
 122 #define HARD_FRAME_POINTER_REGNUM 29
 123
 124 /* Define registers used by the epilogue and return instruction.  */
 125 #undef EPILOGUE_USES
 126 #define EPILOGUE_USES(REGNO)    ((REGNO) == 26 || (REGNO) == 29)
 127
 128 #undef INITIAL_ELIMINATION_OFFSET
 129 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 130   ((OFFSET) = alpha_vms_initial_elimination_offset(FROM, TO))
 131
 132 \f
 133 /* Define a data type for recording info about an argument list
 134    during the scan of that argument list.  This data type should
 135    hold all necessary information about the function itself
 136    and about the args processed so far, enough to enable macros
 137    such as FUNCTION_ARG to determine where the next arg should go.
 138
 139    On Alpha/VMS, this is a structure that contains the number of
 140    arguments and, for each argument, the datatype of that argument.
 141
 142    The number of arguments is a number of words of arguments scanned so far.
 143    Thus 6 or more means all following args should go on the stack.  */
 144
 145 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
 146 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
 147
 148 #undef CUMULATIVE_ARGS
 149 #define CUMULATIVE_ARGS avms_arg_info
 150
 151 /* Initialize a variable CUM of type CUMULATIVE_ARGS
 152    for a call to a function whose data type is FNTYPE.
 153    For a library call, FNTYPE is 0.  */
 154
 155 #undef INIT_CUMULATIVE_ARGS
 156 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 157   (CUM).num_args = 0;                                           \
 158   (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64;    \
 159   (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
 160
 161 #define DEFAULT_PCC_STRUCT_RETURN 0
 162
 163 #if POINTER_SIZE == 64
 164 /* Eventhough pointers are 64bits, only 32bit ever remain significant in code
 165    addresses.  */
 166 #define MASK_RETURN_ADDR (GEN_INT (0xffffffff))
 167 #endif
 168
 169 #undef  ASM_WEAKEN_LABEL
 170 #define ASM_WEAKEN_LABEL(FILE, NAME)                            \
 171    do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);  \
 172         fputc ('\n', FILE); } while (0)
 173
 174 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
 175 #define CTORS_SECTION_ASM_OP "\t.ctors"
 176 #define DTORS_SECTION_ASM_OP "\t.dtors"
 177 #define SDATA_SECTION_ASM_OP "\t.sdata"
 178 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)              \
 179    asm (SECTION_OP "\n\t.long " #FUNC"\n");
 180
 181 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 182
 183 #undef ASM_OUTPUT_ADDR_VEC_ELT
 184 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 185   fprintf (FILE, "\t.quad $L%d\n", (VALUE))
 186
 187 #undef CASE_VECTOR_MODE
 188 #define CASE_VECTOR_MODE DImode
 189 #undef CASE_VECTOR_PC_RELATIVE
 190
 191 #undef ASM_OUTPUT_CASE_LABEL
 192 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 193 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 194
 195 /* This says how to output assembler code to declare an
 196    uninitialized external linkage data object.  */
 197
 198 #define COMMON_ASM_OP "\t.comm\t"
 199
 200 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 201 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 202   vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
 203 \f
 204 /* Control how constructors and destructors are emitted.  */
 205 #define TARGET_ASM_CONSTRUCTOR  vms_asm_out_constructor
 206 #define TARGET_ASM_DESTRUCTOR   vms_asm_out_destructor
 207
 208 #undef SDB_DEBUGGING_INFO
 209 #undef MIPS_DEBUGGING_INFO
 210 #undef DBX_DEBUGGING_INFO
 211
 212 #define DWARF2_DEBUGGING_INFO 1
 213 #define VMS_DEBUGGING_INFO 1
 214
 215 #define DWARF2_UNWIND_INFO 1
 216
 217 #undef EH_RETURN_HANDLER_RTX
 218 #define EH_RETURN_HANDLER_RTX \
 219   gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8))
 220
 221 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
 222 #define LINK_GCC_C_SEQUENCE_SPEC "%G"
 223
 224 /* This is how to output an assembler line
 225    that says to advance the location counter
 226    to a multiple of 2**LOG bytes.  */
 227
 228 #undef ASM_OUTPUT_ALIGN
 229 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 230     fprintf (FILE, "\t.align %d\n", LOG);
 231
 232 /* Switch into a generic section.  */
 233 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section
 234
 235 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)      \
 236   do                                            \
 237     {                                           \
 238       fprintf ((FILE), "\t");                   \
 239       assemble_name (FILE, LABEL1);             \
 240       fprintf (FILE, " = ");                    \
 241       assemble_name (FILE, LABEL2);             \
 242       fprintf (FILE, "\n");                     \
 243     }                                           \
 244  while (0)
 245
 246 #undef PREFERRED_DEBUGGING_TYPE
 247 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 248
 249 #define ASM_PN_FORMAT "%s___%lu"
 250
 251 /* ??? VMS uses different linkage.  */
 252 #undef TARGET_ASM_OUTPUT_MI_THUNK
 253
 254 #undef ASM_SPEC
 255 #undef ASM_FINAL_SPEC
 256
 257 /* The VMS convention is to always provide minimal debug info
 258    for a traceback unless specifically overridden.  */
 259
 260 #undef SUBTARGET_OVERRIDE_OPTIONS
 261 #define SUBTARGET_OVERRIDE_OPTIONS                  \
 262 do {                                                \
 263   if (write_symbols == NO_DEBUG                     \
 264       && debug_info_level == DINFO_LEVEL_NONE)      \
 265     {                                               \
 266       write_symbols = VMS_DEBUG;                    \
 267       debug_info_level = DINFO_LEVEL_TERSE;         \
 268     }                                               \
 269 } while (0)
 270
 271 #undef LINK_SPEC
 272 #if HAVE_GNU_LD
 273 /* GNU-ld built-in linker script already handles the dwarf2 debug sections.  */
 274 #define LINK_SPEC "%{shared} %{v}"
 275 #else
 276 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
 277    VMS link to pull all the dwarf2 debug sections together.  */
 278 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \
 279 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}"
 280 #endif
 281
 282 #undef STARTFILE_SPEC
 283 #define STARTFILE_SPEC \
 284 "%{!shared:%{mvms-return-codes:vcrt0.o%s} %{!mvms-return-codes:pcrt0.o%s} \
 285     crtbegin.o%s} \
 286  %{!static:%{shared:crtbeginS.o%s}}"
 287
 288 #define ENDFILE_SPEC \
 289 "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
 290
 291 #define NAME__MAIN "__gccmain"
 292 #define SYMBOL__MAIN __gccmain
 293
 294 #define INIT_SECTION_ASM_OP "\t.section LIB$INITIALIZE,GBL,NOWRT"
 295
 296 #define LONGLONG_STANDALONE 1
 297
 298 #undef TARGET_VALID_POINTER_MODE
 299 #define TARGET_VALID_POINTER_MODE vms_valid_pointer_mode