gcc/config/alpha/vms.h

   1 /* Output variables, constants and external declarations, for GNU compiler.
   2    Copyright (C) 1996-2022 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   do                                                                       \
 149     {                                                                      \
 150       (CUM).num_args = 0;                                                  \
 151       (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64;           \
 152       (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;           \
 153     }                                                                      \
 154   while (0)
 155
 156 #define DEFAULT_PCC_STRUCT_RETURN 0
 157
 158 /* Even though pointers are 64bits, only 32bit ever remain significant in code
 159    addresses.  */
 160 #define MASK_RETURN_ADDR                                \
 161   (flag_vms_pointer_size == VMS_POINTER_SIZE_NONE       \
 162    ? constm1_rtx                                        \
 163    : GEN_INT (0xffffffff))
 164
 165 #undef  ASM_WEAKEN_LABEL
 166 #define ASM_WEAKEN_LABEL(FILE, NAME)                            \
 167    do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME);  \
 168         fputc ('\n', FILE); } while (0)
 169
 170 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
 171 #define CTORS_SECTION_ASM_OP "\t.ctors"
 172 #define DTORS_SECTION_ASM_OP "\t.dtors"
 173 #define SDATA_SECTION_ASM_OP "\t.sdata"
 174 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)              \
 175    asm (SECTION_OP "\n\t.long " #FUNC"\n");
 176
 177 #undef ASM_OUTPUT_ADDR_DIFF_ELT
 178
 179 #undef ASM_OUTPUT_ADDR_VEC_ELT
 180 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
 181   fprintf (FILE, "\t.quad $L%d\n", (VALUE))
 182
 183 #undef CASE_VECTOR_MODE
 184 #define CASE_VECTOR_MODE DImode
 185 #undef CASE_VECTOR_PC_RELATIVE
 186
 187 #undef ASM_OUTPUT_CASE_LABEL
 188 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)        \
 189 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
 190
 191 /* This says how to output assembler code to declare an
 192    uninitialized external linkage data object.  */
 193
 194 #define COMMON_ASM_OP "\t.comm\t"
 195
 196 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 197 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
 198   vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
 199 \f
 200 /* Control how constructors and destructors are emitted.  */
 201 #define TARGET_ASM_CONSTRUCTOR  vms_asm_out_constructor
 202 #define TARGET_ASM_DESTRUCTOR   vms_asm_out_destructor
 203
 204 #define DWARF2_DEBUGGING_INFO 1
 205 #define VMS_DEBUGGING_INFO 1
 206
 207 #define DWARF2_UNWIND_INFO 1
 208
 209 #undef EH_RETURN_HANDLER_RTX
 210 #define EH_RETURN_HANDLER_RTX \
 211   gen_rtx_MEM (Pmode, plus_constant (Pmode, stack_pointer_rtx, 8))
 212
 213 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
 214 #define LINK_GCC_C_SEQUENCE_SPEC "%G"
 215
 216 /* This is how to output an assembler line
 217    that says to advance the location counter
 218    to a multiple of 2**LOG bytes.  */
 219
 220 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 221     fprintf (FILE, "\t.align %d\n", LOG);
 222
 223 /* This is how to advance the location counter by SIZE bytes.  */
 224
 225 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 226   fprintf (FILE, "\t.space " HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE))
 227
 228 /* This says how to output an assembler line
 229    to define a global common symbol.  */
 230
 231 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE,ROUNDED)      \
 232 ( fputs ("\t.lcomm ", (FILE)),                          \
 233   assemble_name ((FILE), (NAME)),                       \
 234   fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)))
 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                                            \
 241     {                                           \
 242       fprintf ((FILE), "\t");                   \
 243       assemble_name (FILE, LABEL1);             \
 244       fprintf (FILE, " = ");                    \
 245       assemble_name (FILE, LABEL2);             \
 246       fprintf (FILE, "\n");                     \
 247     }                                           \
 248  while (0)
 249
 250 #undef PREFERRED_DEBUGGING_TYPE
 251 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 252
 253 #define ASM_PN_FORMAT "%s___%lu"
 254
 255 /* ??? VMS uses different linkage.  */
 256 #undef TARGET_ASM_OUTPUT_MI_THUNK
 257
 258 #undef ASM_SPEC
 259 #undef ASM_FINAL_SPEC
 260
 261 /* The VMS convention is to always provide minimal debug info
 262    for a traceback unless specifically overridden.
 263
 264    Because ASM_OUTPUT_ADDR_DIFF_ELT is not defined for alpha-vms,
 265    jump tables cannot be output for PIC code, because you can't put
 266    an absolute address in a readonly section.  Putting the table in
 267    a writable section is a security hole.  Therefore, we unset the
 268    flag_jump_tables flag, forcing switch statements to be expanded
 269    using decision trees.  There are probably other ways to address
 270    this issue, but using a decision tree is clearly safe.  */
 271
 272 #undef SUBTARGET_OVERRIDE_OPTIONS
 273 #define SUBTARGET_OVERRIDE_OPTIONS                  \
 274 do {                                                \
 275   if (write_symbols == NO_DEBUG                     \
 276       && debug_info_level == DINFO_LEVEL_NONE)      \
 277     {                                               \
 278       write_symbols = VMS_DEBUG;                    \
 279       debug_info_level = DINFO_LEVEL_TERSE;         \
 280     }                                               \
 281   if (flag_pic)                                     \
 282     flag_jump_tables = 0;                           \
 283 } while (0)
 284
 285 #undef LINK_SPEC
 286 #if HAVE_GNU_LD
 287 /* GNU-ld built-in linker script already handles the dwarf2 debug sections.  */
 288 #define LINK_SPEC "%{shared} %{v}"
 289 #else
 290 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
 291    VMS link to pull all the dwarf2 debug sections together.  */
 292 #define LINK_SPEC "%{g0} %{g*:-g vms-dwarf2.o%s} %{shared} %{v} %{map}"
 293 #endif
 294
 295 #undef STARTFILE_SPEC
 296 #define STARTFILE_SPEC "%{!shared:crt0.o%s crtbegin.o%s} \
 297  %{!static:%{shared:crtbeginS.o%s}}"
 298
 299 #define ENDFILE_SPEC "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
 300
 301 #define INIT_SECTION_ASM_OP "\t.section LIB$INITIALIZE,GBL,NOWRT"
 302
 303 #define LONGLONG_STANDALONE 1
 304
 305 #undef TARGET_VALID_POINTER_MODE
 306 #define TARGET_VALID_POINTER_MODE vms_valid_pointer_mode
 307
 308 /* Default values for _CRTL_VER and _VMS_VER.  */
 309 #define VMS_DEFAULT_CRTL_VER 70320000
 310 #define VMS_DEFAULT_VMS_VER 70320000