gcc/config/alpha/vms.h

   1 /* Output variables, constants and external declarations, for GNU compiler.
   2    Copyright (C) 1996-2018 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 /* Alpha/VMS object format is not really Elf, but this makes compiling
  21    crtstuff.c and dealing with shared library initialization much easier.  */
  22 #define OBJECT_FORMAT_ELF
  23
  24 /* Do not use TM clone registry as it currently doesn't work.  Alpha/VMS
  25    object is too far from ELF for supporting TM out of the box.  */
  26 #define USE_TM_CLONE_REGISTRY 0
  27
  28 /* This enables certain macros in alpha.h, which will make an indirect
  29    reference to an external symbol an invalid address.  This needs to be
  30    defined before we include alpha.h, since it determines which macros
  31    are used for GO_IF_*.  */
  32
  33 #define NO_EXTERNAL_INDIRECT_ADDRESS
  34
  35 #define SUBTARGET_OS_CPP_BUILTINS()             \
  36     do {                                        \
  37       builtin_define ("__ALPHA");               \
  38       if (TARGET_FLOAT_VAX)                     \
  39         builtin_define ("__G_FLOAT");           \
  40       else                                      \
  41         builtin_define ("__IEEE_FLOAT");        \
  42     } while (0)
  43
  44 #undef PCC_STATIC_STRUCT_RETURN
  45
  46 #define MAX_OFILE_ALIGNMENT 524288  /* 8 x 2^16 by DEC Ada Test CD40VRA */
  47
  48 /* The maximum alignment 'malloc' honors.  */
  49 #undef  MALLOC_ABI_ALIGNMENT
  50 #define MALLOC_ABI_ALIGNMENT \
  51   ((flag_vms_malloc64 && flag_vms_pointer_size != VMS_POINTER_SIZE_NONE \
  52    ? 16 : 8) * BITS_PER_UNIT)
  53
  54 #undef FIXED_REGISTERS
  55 #define FIXED_REGISTERS  \
  56  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  57   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  58   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  59   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
  60
  61 #undef CALL_USED_REGISTERS
  62 #define CALL_USED_REGISTERS  \
  63  {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
  64   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
  65   1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
  66   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
  67
  68 /* List the order in which to allocate registers.  Each register must be
  69    listed once, even those in FIXED_REGISTERS.
  70
  71    We allocate in the following order:
  72    $f1                  (nonsaved floating-point register)
  73    $f10-$f15            (likewise)
  74    $f22-$f30            (likewise)
  75    $f21-$f16            (likewise, but input args)
  76    $f0                  (nonsaved, but return value)
  77    $f2-$f9              (saved floating-point registers)
  78    $1                   (nonsaved integer registers)
  79    $22-$25              (likewise)
  80    $28                  (likewise)
  81    $0                   (likewise, but return value)
  82    $21-$16              (likewise, but input args)
  83    $27                  (procedure value in OSF, nonsaved in NT)
  84    $2-$8                (saved integer registers)
  85    $9-$14               (saved integer registers)
  86    $26                  (return PC)
  87    $15                  (frame pointer)
  88    $29                  (global pointer)
  89    $30, $31, $f31       (stack pointer and always zero/ap & fp)  */
  90
  91 #undef REG_ALLOC_ORDER
  92 #define REG_ALLOC_ORDER         \
  93   {33,                                  \
  94    42, 43, 44, 45, 46, 47,              \
  95    54, 55, 56, 57, 58, 59, 60, 61, 62,  \
  96    53, 52, 51, 50, 49, 48,              \
  97    32,                                  \
  98    34, 35, 36, 37, 38, 39, 40, 41,      \
  99    1,                                   \
 100    22, 23, 24, 25,                      \
 101    28,                                  \
 102    0,                                   \
 103    21, 20, 19, 18, 17, 16,              \
 104    27,                                  \
 105    2, 3, 4, 5, 6, 7, 8,                 \
 106    9, 10, 11, 12, 13, 14,               \
 107    26,                                  \
 108    15,                                  \
 109    29,                                  \
 110    30, 31, 63 }
 111
 112 #undef HARD_FRAME_POINTER_REGNUM
 113 #define HARD_FRAME_POINTER_REGNUM 29
 114
 115 /* Define registers used by the epilogue and return instruction.  */
 116 #undef EPILOGUE_USES
 117 #define EPILOGUE_USES(REGNO)    ((REGNO) == 26 || (REGNO) == 29)
 118
 119 #undef INITIAL_ELIMINATION_OFFSET
 120 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                    \
 121   ((OFFSET) = alpha_vms_initial_elimination_offset(FROM, TO))
 122
 123 \f
 124 /* Define a data type for recording info about an argument list
 125    during the scan of that argument list.  This data type should
 126    hold all necessary information about the function itself
 127    and about the args processed so far, enough to enable macros
 128    such as FUNCTION_ARG to determine where the next arg should go.
 129
 130    On Alpha/VMS, this is a structure that contains the number of
 131    arguments and, for each argument, the datatype of that argument.
 132
 133    The number of arguments is a number of words of arguments scanned so far.
 134    Thus 6 or more means all following args should go on the stack.  */
 135
 136 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
 137 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
 138
 139 #undef CUMULATIVE_ARGS
 140 #define CUMULATIVE_ARGS avms_arg_info
 141
 142 /* Initialize a variable CUM of type CUMULATIVE_ARGS
 143    for a call to a function whose data type is FNTYPE.
 144    For a library call, FNTYPE is 0.  */
 145
 146 #undef INIT_CUMULATIVE_ARGS
 147 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
 148   (CUM).num_args = 0;                                           \
 149   (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64;    \
 150   (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
 151
 152 #define DEFAULT_PCC_STRUCT_RETURN 0
 153
 154 /* Even though pointers are 64bits, only 32bit ever remain significant in code
 155    addresses.  */
 156 #define MASK_RETURN_ADDR                                \
 157   (flag_vms_pointer_size == VMS_POINTER_SIZE_NONE       \
 158    ? constm1_rtx                                        \
 159    : GEN_INT (0xffffffff))
 160
 161 #undef  ASM_WEAKEN_LABEL
 162 #define ASM_WEAKEN_LABEL(FILE, NAME)                            \
 163    do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);  \
 164         fputc ('\n', FILE); } while (0)
 165
 166 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
 167 #define CTORS_SECTION_ASM_OP "\t.ctors"
 168 #define DTORS_SECTION_ASM_OP "\t.dtors"
 169 #define SDATA_SECTION_ASM_OP "\t.sdata"
 170 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)              \
 171    asm (SECTION_OP "\n\t.long " #FUNC"\n");
 172
 173 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 174
 175 #undef ASM_OUTPUT_ADDR_VEC_ELT
 176 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 177   fprintf (FILE, "\t.quad $L%d\n", (VALUE))
 178
 179 #undef CASE_VECTOR_MODE
 180 #define CASE_VECTOR_MODE DImode
 181 #undef CASE_VECTOR_PC_RELATIVE
 182
 183 #undef ASM_OUTPUT_CASE_LABEL
 184 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 185 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 186
 187 /* This says how to output assembler code to declare an
 188    uninitialized external linkage data object.  */
 189
 190 #define COMMON_ASM_OP "\t.comm\t"
 191
 192 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 193 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 194   vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
 195 \f
 196 /* Control how constructors and destructors are emitted.  */
 197 #define TARGET_ASM_CONSTRUCTOR  vms_asm_out_constructor
 198 #define TARGET_ASM_DESTRUCTOR   vms_asm_out_destructor
 199
 200 #define DWARF2_DEBUGGING_INFO 1
 201 #define VMS_DEBUGGING_INFO 1
 202
 203 #define DWARF2_UNWIND_INFO 1
 204
 205 #undef EH_RETURN_HANDLER_RTX
 206 #define EH_RETURN_HANDLER_RTX \
 207   gen_rtx_MEM (Pmode, plus_constant (Pmode, stack_pointer_rtx, 8))
 208
 209 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
 210 #define LINK_GCC_C_SEQUENCE_SPEC "%G"
 211
 212 /* This is how to output an assembler line
 213    that says to advance the location counter
 214    to a multiple of 2**LOG bytes.  */
 215
 216 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 217     fprintf (FILE, "\t.align %d\n", LOG);
 218
 219 /* This is how to advance the location counter by SIZE bytes.  */
 220
 221 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 222   fprintf (FILE, "\t.space " HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE))
 223
 224 /* This says how to output an assembler line
 225    to define a global common symbol.  */
 226
 227 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE,ROUNDED)      \
 228 ( fputs ("\t.lcomm ", (FILE)),                          \
 229   assemble_name ((FILE), (NAME)),                       \
 230   fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)))
 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    Because ASM_OUTPUT_ADDR_DIFF_ELT is not defined for alpha-vms,
 261    jump tables cannot be output for PIC code, because you can't put
 262    an absolute address in a readonly section.  Putting the table in
 263    a writable section is a security hole.  Therefore, we unset the
 264    flag_jump_tables flag, forcing switch statements to be expanded
 265    using decision trees.  There are probably other ways to address
 266    this issue, but using a decision tree is clearly safe.  */
 267
 268 #undef SUBTARGET_OVERRIDE_OPTIONS
 269 #define SUBTARGET_OVERRIDE_OPTIONS                  \
 270 do {                                                \
 271   if (write_symbols == NO_DEBUG                     \
 272       && debug_info_level == DINFO_LEVEL_NONE)      \
 273     {                                               \
 274       write_symbols = VMS_DEBUG;                    \
 275       debug_info_level = DINFO_LEVEL_TERSE;         \
 276     }                                               \
 277   if (flag_pic)                                     \
 278     flag_jump_tables = 0;                           \
 279 } while (0)
 280
 281 #undef LINK_SPEC
 282 #if HAVE_GNU_LD
 283 /* GNU-ld built-in linker script already handles the dwarf2 debug sections.  */
 284 #define LINK_SPEC "%{shared} %{v}"
 285 #else
 286 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
 287    VMS link to pull all the dwarf2 debug sections together.  */
 288 #define LINK_SPEC "%{g0} %{g*:-g vms-dwarf2.o%s} %{shared} %{v} %{map}"
 289 #endif
 290
 291 #undef STARTFILE_SPEC
 292 #define STARTFILE_SPEC "%{!shared:crt0.o%s crtbegin.o%s} \
 293  %{!static:%{shared:crtbeginS.o%s}}"
 294
 295 #define ENDFILE_SPEC "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
 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
 303
 304 /* Default values for _CRTL_VER and _VMS_VER.  */
 305 #define VMS_DEFAULT_CRTL_VER 70320000
 306 #define VMS_DEFAULT_VMS_VER 70320000