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 #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 #define VMS_DEBUG_MAIN_POINTER "TRANSFER$BREAK$GO"
  54
  55 #undef PCC_STATIC_STRUCT_RETURN
  56
  57 /* "long" is 32 bits, but 64 bits for Ada.  */
  58 #undef LONG_TYPE_SIZE
  59 #define LONG_TYPE_SIZE 32
  60 #define ADA_LONG_TYPE_SIZE 64
  61
  62 /* Pointer is 32 bits but the hardware has 64-bit addresses, sign extended.  */
  63 #undef POINTER_SIZE
  64 #define POINTER_SIZE 32
  65 #define POINTERS_EXTEND_UNSIGNED 0
  66
  67 #define MAX_OFILE_ALIGNMENT 524288  /* 8 x 2^16 by DEC Ada Test CD40VRA */
  68
  69 /* The maximum alignment 'malloc' honors.  */
  70 #undef  MALLOC_ABI_ALIGNMENT
  71 #define MALLOC_ABI_ALIGNMENT ((TARGET_MALLOC64 ? 16 : 8) * BITS_PER_UNIT)
  72
  73 #undef FIXED_REGISTERS
  74 #define FIXED_REGISTERS  \
  75  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  76   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  77   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  78   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
  79
  80 #undef CALL_USED_REGISTERS
  81 #define CALL_USED_REGISTERS  \
  82  {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  83   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  84   1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  85   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
  86
  87 /* List the order in which to allocate registers.  Each register must be
  88    listed once, even those in FIXED_REGISTERS.
  89
  90    We allocate in the following order:
  91    $f1                  (nonsaved floating-point register)
  92    $f10-$f15            (likewise)
  93    $f22-$f30            (likewise)
  94    $f21-$f16            (likewise, but input args)
  95    $f0                  (nonsaved, but return value)
  96    $f2-$f9              (saved floating-point registers)
  97    $1                   (nonsaved integer registers)
  98    $22-$25              (likewise)
  99    $28                  (likewise)
 100    $0                   (likewise, but return value)
 101    $21-$16              (likewise, but input args)
 102    $27                  (procedure value in OSF, nonsaved in NT)
 103    $2-$8                (saved integer registers)
 104    $9-$14               (saved integer registers)
 105    $26                  (return PC)
 106    $15                  (frame pointer)
 107    $29                  (global pointer)
 108    $30, $31, $f31       (stack pointer and always zero/ap & fp)  */
 109
 110 #undef REG_ALLOC_ORDER
 111 #define REG_ALLOC_ORDER         \
 112   {33,                                  \
 113    42, 43, 44, 45, 46, 47,              \
 114    54, 55, 56, 57, 58, 59, 60, 61, 62,  \
 115    53, 52, 51, 50, 49, 48,              \
 116    32,                                  \
 117    34, 35, 36, 37, 38, 39, 40, 41,      \
 118    1,                                   \
 119    22, 23, 24, 25,                      \
 120    28,                                  \
 121    0,                                   \
 122    21, 20, 19, 18, 17, 16,              \
 123    27,                                  \
 124    2, 3, 4, 5, 6, 7, 8,                 \
 125    9, 10, 11, 12, 13, 14,               \
 126    26,                                  \
 127    15,                                  \
 128    29,                                  \
 129    30, 31, 63 }
 130
 131 #undef HARD_FRAME_POINTER_REGNUM
 132 #define HARD_FRAME_POINTER_REGNUM 29
 133
 134 /* Define registers used by the epilogue and return instruction.  */
 135 #undef EPILOGUE_USES
 136 #define EPILOGUE_USES(REGNO)    ((REGNO) == 26 || (REGNO) == 29)
 137
 138 #undef INITIAL_ELIMINATION_OFFSET
 139 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 140   ((OFFSET) = alpha_vms_initial_elimination_offset(FROM, TO))
 141
 142 \f
 143 /* Define a data type for recording info about an argument list
 144    during the scan of that argument list.  This data type should
 145    hold all necessary information about the function itself
 146    and about the args processed so far, enough to enable macros
 147    such as FUNCTION_ARG to determine where the next arg should go.
 148
 149    On Alpha/VMS, this is a structure that contains the number of
 150    arguments and, for each argument, the datatype of that argument.
 151
 152    The number of arguments is a number of words of arguments scanned so far.
 153    Thus 6 or more means all following args should go on the stack.  */
 154
 155 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
 156 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
 157
 158 #undef CUMULATIVE_ARGS
 159 #define CUMULATIVE_ARGS avms_arg_info
 160
 161 /* Initialize a variable CUM of type CUMULATIVE_ARGS
 162    for a call to a function whose data type is FNTYPE.
 163    For a library call, FNTYPE is 0.  */
 164
 165 #undef INIT_CUMULATIVE_ARGS
 166 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 167   (CUM).num_args = 0;                                           \
 168   (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64;    \
 169   (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
 170
 171 #define DEFAULT_PCC_STRUCT_RETURN 0
 172
 173 #undef  ASM_WEAKEN_LABEL
 174 #define ASM_WEAKEN_LABEL(FILE, NAME)                            \
 175    do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);  \
 176         fputc ('\n', FILE); } while (0)
 177
 178 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
 179 #define CTORS_SECTION_ASM_OP "\t.ctors"
 180 #define DTORS_SECTION_ASM_OP "\t.dtors"
 181 #define SDATA_SECTION_ASM_OP "\t.sdata"
 182 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)              \
 183    asm (SECTION_OP "\n\t.long " #FUNC"\n");
 184
 185 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 186
 187 #undef ASM_OUTPUT_ADDR_VEC_ELT
 188 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 189   fprintf (FILE, "\t.quad $L%d\n", (VALUE))
 190
 191 #undef CASE_VECTOR_MODE
 192 #define CASE_VECTOR_MODE DImode
 193 #undef CASE_VECTOR_PC_RELATIVE
 194
 195 #undef ASM_OUTPUT_CASE_LABEL
 196 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 197 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 198
 199 /* This says how to output assembler code to declare an
 200    uninitialized external linkage data object.  */
 201
 202 #define COMMON_ASM_OP "\t.comm\t"
 203
 204 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 205 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 206   vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
 207 \f
 208 /* Control how constructors and destructors are emitted.  */
 209 #define TARGET_ASM_CONSTRUCTOR  vms_asm_out_constructor
 210 #define TARGET_ASM_DESTRUCTOR   vms_asm_out_destructor
 211
 212 #undef SDB_DEBUGGING_INFO
 213 #undef MIPS_DEBUGGING_INFO
 214 #undef DBX_DEBUGGING_INFO
 215
 216 #define DWARF2_DEBUGGING_INFO 1
 217 #define VMS_DEBUGGING_INFO 1
 218
 219 #define DWARF2_UNWIND_INFO 1
 220
 221 #undef EH_RETURN_HANDLER_RTX
 222 #define EH_RETURN_HANDLER_RTX \
 223   gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8))
 224
 225 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
 226 #define LINK_GCC_C_SEQUENCE_SPEC "%G"
 227
 228 /* This is how to output an assembler line
 229    that says to advance the location counter
 230    to a multiple of 2**LOG bytes.  */
 231
 232 #undef ASM_OUTPUT_ALIGN
 233 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 234     fprintf (FILE, "\t.align %d\n", LOG);
 235
 236 /* Switch into a generic section.  */
 237 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section
 238
 239 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 240   do {  fprintf ((FILE), "\t.literals\n");                              \
 241         in_section = NULL;                                              \
 242         fprintf ((FILE), "\t");                                         \
 243         assemble_name (FILE, LABEL1);                                   \
 244         fprintf (FILE, " = ");                                          \
 245         assemble_name (FILE, LABEL2);                                   \
 246         fprintf (FILE, "\n");                                           \
 247   } while (0)
 248
 249 #undef PREFERRED_DEBUGGING_TYPE
 250 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 251
 252 #define ASM_PN_FORMAT "%s___%lu"
 253
 254 /* ??? VMS uses different linkage.  */
 255 #undef TARGET_ASM_OUTPUT_MI_THUNK
 256
 257 #undef ASM_SPEC
 258 #undef ASM_FINAL_SPEC
 259
 260 /* The VMS convention is to always provide minimal debug info
 261    for a traceback unless specifically overridden.  */
 262
 263 #undef SUBTARGET_OVERRIDE_OPTIONS
 264 #define SUBTARGET_OVERRIDE_OPTIONS                  \
 265 do {                                                \
 266   if (write_symbols == NO_DEBUG                     \
 267       && debug_info_level == DINFO_LEVEL_NONE)      \
 268     {                                               \
 269       write_symbols = VMS_DEBUG;                    \
 270       debug_info_level = DINFO_LEVEL_TERSE;         \
 271     }                                               \
 272 } while (0)
 273
 274 #undef LINK_SPEC
 275 #if HAVE_GNU_LD
 276 /* GNU-ld built-in linker script already handles the dwarf2 debug sections.  */
 277 #define LINK_SPEC "%{shared} %{v}"
 278 #else
 279 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
 280    VMS link to pull all the dwarf2 debug sections together.  */
 281 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \
 282 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}"
 283 #endif
 284
 285 #undef STARTFILE_SPEC
 286 #define STARTFILE_SPEC \
 287 "%{!shared:%{mvms-return-codes:vcrt0.o%s} %{!mvms-return-codes:pcrt0.o%s} \
 288     crtbegin.o%s} \
 289  %{!static:%{shared:crtbeginS.o%s}}"
 290
 291 #define ENDFILE_SPEC \
 292 "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
 293
 294 #define NAME__MAIN "__gccmain"
 295 #define SYMBOL__MAIN __gccmain
 296
 297 #define INIT_SECTION_ASM_OP "\t.section LIB$INITIALIZE,GBL,NOWRT"
 298
 299 #define LONGLONG_STANDALONE 1
 300
 301 #undef TARGET_VALID_POINTER_MODE
 302 #define TARGET_VALID_POINTER_MODE vms_valid_pointer_mode