1 /* Output variables, constants and external declarations, for GNU compiler. 2 Copyright (C) 1996-2013 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)) 122 123 124 /* 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) 195 196 /* 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 307