1 /* Configuration file for an m68k OpenBSD target. 2 Copyright (C) 1999 Free Software Foundation, Inc. 3 4 This file is part of GNU CC. 5 6 GNU CC 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 2, or (at your option) 9 any later version. 10 11 GNU CC 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 GNU CC; see the file COPYING. If not, write to 18 the Free Software Foundation, 59 Temple Place - Suite 330, 19 Boston, MA 02111-1307, USA. */ 20 21 /* Define __HAVE_68881__ in preprocessor, unless -msoft-float is specified. 22 This will control the use of inline 68881 insns in certain macros. */ 23 #undef CPP_SPEC 24 #define CPP_SPEC "%{!msoft-float:-D__HAVE_68881__ -D__HAVE_FPU__} " \ 25 OBSD_CPP_SPEC 26 27 /* Run-time target specifications. */ 28 #define TARGET_OS_CPP_BUILTINS() \ 29 do \ 30 { \ 31 OPENBSD_OS_CPP_BUILTINS_ELF(); \ 32 builtin_define ("__m68k__"); \ 33 builtin_define ("__SVR4_ABI__"); \ 34 builtin_define ("__motorola__"); \ 35 builtin_define ("__mc68000__"); \ 36 builtin_define ("__mc68020__"); \ 37 } \ 38 while (0) 39 40 /* m68k as needs to know about the processor subtype. */ 41 #undef ASM_SPEC 42 #define ASM_SPEC "%| %{m68030} %{m68040} %{m68060} %{fpic:-k} %{fPIC:-k -K}" 43 44 #undef LINK_SPEC 45 #define LINK_SPEC \ 46 "%{!shared:%{!nostdlib:%{!r*:%{!e*:-e __start}}}} \ 47 %{shared:-shared} %{R*} \ 48 %{static:-Bstatic} \ 49 %{!static:-Bdynamic} \ 50 %{assert*} \ 51 %{!dynamic-linker:-dynamic-linker /usr/libexec/ld.so}" 52 53 /* As an elf system, we need crtbegin/crtend stuff. */ 54 #undef STARTFILE_SPEC 55 #define STARTFILE_SPEC "\ 56 %{!shared: %{pg:gcrt0%O%s} %{!pg:%{p:gcrt0%O%s} %{!p:crt0%O%s}} \ 57 crtbegin%O%s} %{shared:crtbeginS%O%s}" 58 #undef ENDFILE_SPEC 59 #define ENDFILE_SPEC "%{!shared:crtend%O%s} %{shared:crtendS%O%s}" 60 61 /* Layout of source language data types. */ 62 63 /* This must agree with <machine/_types.h> */ 64 #undef SIZE_TYPE 65 #define SIZE_TYPE "long unsigned int" 66 67 #undef PTRDIFF_TYPE 68 #define PTRDIFF_TYPE "long int" 69 70 #undef INTMAX_TYPE 71 #define INTMAX_TYPE "long long int" 72 73 #undef UINTMAX_TYPE 74 #define UINTMAX_TYPE "long long unsigned int" 75 76 #undef WCHAR_TYPE 77 #define WCHAR_TYPE "int" 78 79 #undef WCHAR_TYPE_SIZE 80 #define WCHAR_TYPE_SIZE 32 81 82 83 #undef FUNCTION_PROFILER 84 #define FUNCTION_PROFILER(FILE, LABELNO) \ 85 do \ 86 { \ 87 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \ 88 if (flag_pic) \ 89 fprintf (FILE, "\tbsr.l __mcount@PLTPC\n"); \ 90 else \ 91 fprintf (FILE, "\tjbsr __mcount\n"); \ 92 } \ 93 while (0) 94 95 /* The prefix for register names. Note that REGISTER_NAMES 96 is supposed to include this prefix. Also note that this is NOT an 97 fprintf format string, it is a literal string. */ 98 99 #undef REGISTER_PREFIX 100 #define REGISTER_PREFIX "%" 101 102 103 /* The prefix for local (compiler generated) lables. 104 These labels will not appear in the symbol table. */ 105 106 #undef LOCAL_LABEL_PREFIX 107 #define LOCAL_LABEL_PREFIX "." 108 109 110 /* The prefix to add to user-visible assembler symbols. */ 111 112 #undef USER_LABEL_PREFIX 113 #define USER_LABEL_PREFIX "" 114 115 116 /* The prefix for immediate operands. */ 117 118 #undef IMMEDIATE_PREFIX 119 #define IMMEDIATE_PREFIX "#" 120 121 122 #undef ASM_COMMENT_START 123 #define ASM_COMMENT_START "|" 124 125 126 /* How to refer to registers in assembler output. 127 This sequence is indexed by compiler's hard-register-number. 128 Motorola format uses different register names than defined in m68k.h. 129 We also take this chance to convert 'a6' to 'fp' */ 130 131 #undef REGISTER_NAMES 132 133 #ifndef SUPPORT_SUN_FPA 134 135 #define REGISTER_NAMES \ 136 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \ 137 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%fp", "%sp", \ 138 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" } 139 140 #else /* SUPPORT_SUN_FPA */ 141 142 #define REGISTER_NAMES \ 143 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \ 144 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%fp", "%sp", \ 145 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7", \ 146 "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6","%fpa7", \ 147 "%fpa8", "%fpa9", "%fpa10","%fpa11","%fpa12","%fpa13","%fpa14","%fpa15", \ 148 "%fpa16","%fpa17","%fpa18","%fpa19","%fpa20","%fpa21","%fpa22","%fpa23", \ 149 "%fpa24","%fpa25","%fpa26","%fpa27","%fpa28","%fpa29","%fpa30","%fpa31" } 150 151 #endif /* ! SUPPORT_SUN_FPA */ 152 153 154 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to 155 keep switch tables in the text section. */ 156 157 #undef JUMP_TABLES_IN_TEXT_SECTION 158 #define JUMP_TABLES_IN_TEXT_SECTION 1 159 160 161 /* Use the default action for outputting the case label. */ 162 #undef ASM_OUTPUT_CASE_LABEL 163 #define ASM_RETURN_CASE_JUMP \ 164 do { \ 165 if (TARGET_5200) \ 166 { \ 167 if (ADDRESS_REG_P (operands[0])) \ 168 return "jmp %%pc@(2,%0:l)"; \ 169 else \ 170 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \ 171 } \ 172 else \ 173 return "jmp %%pc@(2,%0:w)"; \ 174 } while (0) 175 176 177 /* This is how to output an assembler line that says to advance the 178 location counter to a multiple of 2**LOG bytes. */ 179 180 #undef ASM_OUTPUT_ALIGN 181 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 182 do \ 183 { \ 184 if ((LOG) > 0) \ 185 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \ 186 } \ 187 while (0) 188 189 190 /* If defined, a C expression whose value is a string containing the 191 assembler operation to identify the following data as uninitialized global 192 data. */ 193 194 #define BSS_SECTION_ASM_OP ".section\t.bss" 195 196 197 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a 198 separate, explicit argument. If you define this macro, it is used 199 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in 200 handling the required alignment of the variable. The alignment is 201 specified as the number of bits. 202 203 Try to use function `asm_output_aligned_bss' defined in file 204 `varasm.c' when defining this macro. */ 205 206 #undef ASM_OUTPUT_ALIGNED_BSS 207 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 208 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN) 209 210 211 #undef ASM_OUTPUT_COMMON 212 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ 213 ( fputs (".comm ", (FILE)), \ 214 assemble_name ((FILE), (NAME)), \ 215 fprintf ((FILE), ",%u\n", (SIZE))) 216 217 #undef ASM_OUTPUT_LOCAL 218 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ 219 ( fputs (".lcomm ", (FILE)), \ 220 assemble_name ((FILE), (NAME)), \ 221 fprintf ((FILE), ",%u\n", (SIZE))) 222 223 224 /* XXX 225 This is the end of the chunk lifted from m68kelf.h */ 226 227 228 /* XXX 229 The following chunk is more or less lifted from m68kv4.h. 230 We'd like to just #include that file, but it has not yet 231 been converted to the new include style. 232 233 Should there be a m68kv4-abi.h ?? */ 234 235 236 /* Register in which address to store a structure value is passed to a 237 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */ 238 239 #undef STRUCT_VALUE_REGNUM 240 #define STRUCT_VALUE_REGNUM 8 241 242 243 /* Register in which static-chain is passed to a function. The 244 default isn m68k.h is a0, but that is already the struct value 245 regnum. Make it a1 instead. */ 246 247 #undef STATIC_CHAIN_REGNUM 248 #define STATIC_CHAIN_REGNUM 9 249 250 251 /* Now to renumber registers for dbx and gdb. 252 We use the Sun-3 convention, which is: 253 floating point registers have numbers 18 to 25, not 254 16 to 23 as they do in the compiler. */ 255 256 #undef DBX_REGISTER_NUMBER 257 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2) 258 259 260 /* 1 if N is a possible register number for a function value. For 261 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral, 262 pointer, or floating types, respectively. Reject fp0 if not using 263 a 68881 coprocessor. */ 264 265 #undef FUNCTION_VALUE_REGNO_P 266 #define FUNCTION_VALUE_REGNO_P(N) \ 267 ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16)) 268 269 270 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for 271 more than one register. */ 272 273 #undef NEEDS_UNTYPED_CALL 274 #define NEEDS_UNTYPED_CALL 1 275 276 277 /* Define how to generate (in the callee) the output value of a 278 function and how to find (in the caller) the value returned by a 279 function. VALTYPE is the data type of the value (as a tree). If 280 the precise function being called is known, FUNC is its 281 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the 282 result in d0, a0, or fp0 as appropriate. */ 283 284 #undef FUNCTION_VALUE 285 #define FUNCTION_VALUE(VALTYPE, FUNC) \ 286 (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881 \ 287 ? gen_rtx_REG (TYPE_MODE (VALTYPE), 16) \ 288 : (POINTER_TYPE_P (VALTYPE) \ 289 ? gen_rtx_REG (TYPE_MODE (VALTYPE), 8) \ 290 : gen_rtx_REG (TYPE_MODE (VALTYPE), 0))) 291 292 293 /* For compatibility with the large body of existing code which does 294 not always properly declare external functions returning pointer 295 types, the m68k/SVR4 convention is to copy the value returned for 296 pointer functions from a0 to d0 in the function epilogue, so that 297 callers that have neglected to properly declare the callee can 298 still find the correct return value. */ 299 300 extern int current_function_returns_pointer; 301 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \ 302 do \ 303 { \ 304 if (current_function_returns_pointer \ 305 && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \ 306 asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n"); \ 307 } \ 308 while (0) 309 310 311 /* Define how to find the value returned by a library function 312 assuming the value has mode MODE. 313 For m68k/SVR4 look for integer values in d0, pointer values in d0 314 (returned in both d0 and a0), and floating values in fp0. */ 315 316 #undef LIBCALL_VALUE 317 #define LIBCALL_VALUE(MODE) \ 318 ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode) \ 319 && TARGET_68881) \ 320 ? gen_rtx_REG (MODE, 16) \ 321 : gen_rtx_REG (MODE, 0)) 322 323 324 /* Boundary (in *bits*) on which stack pointer should be aligned. 325 The m68k/SVR4 convention is to keep the stack pointer longword aligned. */ 326 327 #undef STACK_BOUNDARY 328 #define STACK_BOUNDARY 32 329 330 331 /* Alignment of field after `int : 0' in a structure. 332 For m68k/SVR4, this is the next longword boundary. */ 333 334 #undef EMPTY_FIELD_BOUNDARY 335 #define EMPTY_FIELD_BOUNDARY 32 336 337 338 /* No data type wants to be aligned rounder than this. 339 For m68k/SVR4, some types (doubles for example) are aligned on 8 byte 340 boundaries */ 341 342 #undef BIGGEST_ALIGNMENT 343 #define BIGGEST_ALIGNMENT 64 344 345 346 /* For m68k SVR4, structures are returned using the reentrant 347 technique. */ 348 349 #undef PCC_STATIC_STRUCT_RETURN 350 351 352 /* The svr4 ABI for the m68k says that records and unions are returned 353 in memory. */ 354 355 #undef DEFAULT_PCC_STRUCT_RETURN 356 #define DEFAULT_PCC_STRUCT_RETURN 1 357 358 /* Output assembler code for a block containing the constant parts 359 of a trampoline, leaving space for the variable parts. */ 360 361 /* On m68k svr4, the trampoline is different from the generic version 362 in that we use a1 as the static call chain. */ 363 364 #undef TRAMPOLINE_TEMPLATE 365 #define TRAMPOLINE_TEMPLATE(FILE) \ 366 { \ 367 assemble_aligned_integer (2, GEN_INT (0x227a)); \ 368 assemble_aligned_integer (2, GEN_INT (8)); \ 369 assemble_aligned_integer (2, GEN_INT (0x2f3a)); \ 370 assemble_aligned_integer (2, GEN_INT (8)); \ 371 assemble_aligned_integer (2, GEN_INT (0x4e75)); \ 372 assemble_aligned_integer (4, const0_rtx); \ 373 assemble_aligned_integer (4, const0_rtx); \ 374 } 375 376 /* Redefine since we are using a different trampoline */ 377 #undef TRAMPOLINE_SIZE 378 #define TRAMPOLINE_SIZE 18 379 380 /* Emit RTL insns to initialize the variable parts of a trampoline. 381 FNADDR is an RTX for the address of the function's pure code. 382 CXT is an RTX for the static chain value for the function. */ 383 384 #undef INITIALIZE_TRAMPOLINE 385 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \ 386 { \ 387 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \ 388 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \ 389 } 390 391 392 /* XXX 393 This is the end of the chunk lifted from m68kv4.h */ 394