1 /* tc-fr30.c -- Assembler for the Fujitsu FR30. 2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2005 3 Free Software Foundation, Inc. 4 5 This file is part of GAS, the GNU Assembler. 6 7 GAS is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2, or (at your option) 10 any later version. 11 12 GAS is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GAS; see the file COPYING. If not, write to 19 the Free Software Foundation, 51 Franklin Street - Fifth Floor, 20 Boston, MA 02110-1301, USA. */ 21 22 #include <stdio.h> 23 #include "as.h" 24 #include "safe-ctype.h" 25 #include "subsegs.h" 26 #include "symcat.h" 27 #include "opcodes/fr30-desc.h" 28 #include "opcodes/fr30-opc.h" 29 #include "cgen.h" 30 31 /* Structure to hold all of the different components describing 32 an individual instruction. */ 33 typedef struct 34 { 35 const CGEN_INSN * insn; 36 const CGEN_INSN * orig_insn; 37 CGEN_FIELDS fields; 38 #if CGEN_INT_INSN_P 39 CGEN_INSN_INT buffer [1]; 40 #define INSN_VALUE(buf) (*(buf)) 41 #else 42 unsigned char buffer [CGEN_MAX_INSN_SIZE]; 43 #define INSN_VALUE(buf) (buf) 44 #endif 45 char * addr; 46 fragS * frag; 47 int num_fixups; 48 fixS * fixups [GAS_CGEN_MAX_FIXUPS]; 49 int indices [MAX_OPERAND_INSTANCES]; 50 } 51 fr30_insn; 52 53 const char comment_chars[] = ";"; 54 const char line_comment_chars[] = "#"; 55 const char line_separator_chars[] = "|"; 56 const char EXP_CHARS[] = "eE"; 57 const char FLT_CHARS[] = "dD"; 58 59 #define FR30_SHORTOPTS "" 60 const char * md_shortopts = FR30_SHORTOPTS; 61 62 struct option md_longopts[] = 63 { 64 {NULL, no_argument, NULL, 0} 65 }; 66 size_t md_longopts_size = sizeof (md_longopts); 67 68 int 69 md_parse_option (int c ATTRIBUTE_UNUSED, 70 char *arg ATTRIBUTE_UNUSED) 71 { 72 switch (c) 73 { 74 default: 75 return 0; 76 } 77 return 1; 78 } 79 80 void 81 md_show_usage (FILE * stream) 82 { 83 fprintf (stream, _(" FR30 specific command line options:\n")); 84 } 85 86 /* The target specific pseudo-ops which we support. */ 87 const pseudo_typeS md_pseudo_table[] = 88 { 89 { "word", cons, 4 }, 90 { NULL, NULL, 0 } 91 }; 92 93 94 void 95 md_begin (void) 96 { 97 /* Initialize the `cgen' interface. */ 98 99 /* Set the machine number and endian. */ 100 gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0, 101 CGEN_CPU_OPEN_ENDIAN, 102 CGEN_ENDIAN_BIG, 103 CGEN_CPU_OPEN_END); 104 fr30_cgen_init_asm (gas_cgen_cpu_desc); 105 106 /* This is a callback from cgen to gas to parse operands. */ 107 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); 108 } 109 110 void 111 md_assemble (char *str) 112 { 113 static int last_insn_had_delay_slot = 0; 114 fr30_insn insn; 115 char *errmsg; 116 117 /* Initialize GAS's cgen interface for a new instruction. */ 118 gas_cgen_init_parse (); 119 120 insn.insn = fr30_cgen_assemble_insn 121 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); 122 123 if (!insn.insn) 124 { 125 as_bad (errmsg); 126 return; 127 } 128 129 /* Doesn't really matter what we pass for RELAX_P here. */ 130 gas_cgen_finish_insn (insn.insn, insn.buffer, 131 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); 132 133 /* Warn about invalid insns in delay slots. */ 134 if (last_insn_had_delay_slot 135 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT)) 136 as_warn (_("Instruction %s not allowed in a delay slot."), 137 CGEN_INSN_NAME (insn.insn)); 138 139 last_insn_had_delay_slot 140 = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT); 141 } 142 143 /* The syntax in the manual says constants begin with '#'. 144 We just ignore it. */ 145 146 void 147 md_operand (expressionS * expressionP) 148 { 149 if (* input_line_pointer == '#') 150 { 151 input_line_pointer ++; 152 expression (expressionP); 153 } 154 } 155 156 valueT 157 md_section_align (segT segment, valueT size) 158 { 159 int align = bfd_get_section_alignment (stdoutput, segment); 160 161 return ((size + (1 << align) - 1) & (-1 << align)); 162 } 163 164 symbolS * 165 md_undefined_symbol (char *name ATTRIBUTE_UNUSED) 166 { 167 return NULL; 168 } 169 170 /* Interface to relax_segment. */ 171 172 /* FIXME: Build table by hand, get it working, then machine generate. */ 173 174 const relax_typeS md_relax_table[] = 175 { 176 /* The fields are: 177 1) most positive reach of this state, 178 2) most negative reach of this state, 179 3) how many bytes this mode will add to the size of the current frag 180 4) which index into the table to try if we can't fit into this one. */ 181 182 /* The first entry must be unused because an `rlx_more' value of zero ends 183 each list. */ 184 {1, 1, 0, 0}, 185 186 /* The displacement used by GAS is from the end of the 2 byte insn, 187 so we subtract 2 from the following. */ 188 /* 16 bit insn, 8 bit disp -> 10 bit range. 189 This doesn't handle a branch in the right slot at the border: 190 the "& -4" isn't taken into account. It's not important enough to 191 complicate things over it, so we subtract an extra 2 (or + 2 in -ve 192 case). */ 193 {511 - 2 - 2, -512 - 2 + 2, 0, 2 }, 194 /* 32 bit insn, 24 bit disp -> 26 bit range. */ 195 {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 }, 196 /* Same thing, but with leading nop for alignment. */ 197 {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 } 198 }; 199 200 /* Return an initial guess of the length by which a fragment must grow to 201 hold a branch to reach its destination. 202 Also updates fr_type/fr_subtype as necessary. 203 204 Called just before doing relaxation. 205 Any symbol that is now undefined will not become defined. 206 The guess for fr_var is ACTUALLY the growth beyond fr_fix. 207 Whatever we do to grow fr_fix or fr_var contributes to our returned value. 208 Although it may not be explicit in the frag, pretend fr_var starts with a 209 0 value. */ 210 211 int 212 md_estimate_size_before_relax (fragS * fragP, segT segment) 213 { 214 /* The only thing we have to handle here are symbols outside of the 215 current segment. They may be undefined or in a different segment in 216 which case linker scripts may place them anywhere. 217 However, we can't finish the fragment here and emit the reloc as insn 218 alignment requirements may move the insn about. */ 219 220 if (S_GET_SEGMENT (fragP->fr_symbol) != segment) 221 { 222 /* The symbol is undefined in this segment. 223 Change the relaxation subtype to the max allowable and leave 224 all further handling to md_convert_frag. */ 225 fragP->fr_subtype = 2; 226 227 { 228 const CGEN_INSN * insn; 229 int i; 230 231 /* Update the recorded insn. 232 Fortunately we don't have to look very far. 233 FIXME: Change this to record in the instruction the next higher 234 relaxable insn to use. */ 235 for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++) 236 { 237 if ((strcmp (CGEN_INSN_MNEMONIC (insn), 238 CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn)) 239 == 0) 240 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED)) 241 break; 242 } 243 if (i == 4) 244 abort (); 245 246 fragP->fr_cgen.insn = insn; 247 return 2; 248 } 249 } 250 251 /* Return the size of the variable part of the frag. */ 252 return md_relax_table[fragP->fr_subtype].rlx_length; 253 } 254 255 /* *fragP has been relaxed to its final size, and now needs to have 256 the bytes inside it modified to conform to the new size. 257 258 Called after relaxation is finished. 259 fragP->fr_type == rs_machine_dependent. 260 fragP->fr_subtype is the subtype of what the address relaxed to. */ 261 262 void 263 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, 264 segT sec ATTRIBUTE_UNUSED, 265 fragS *fragP ATTRIBUTE_UNUSED) 266 { 267 } 268 269 /* Functions concerning relocs. */ 270 271 /* The location from which a PC relative jump should be calculated, 272 given a PC relative reloc. */ 273 274 long 275 md_pcrel_from_section (fixS * fixP, segT sec) 276 { 277 if (fixP->fx_addsy != (symbolS *) NULL 278 && (! S_IS_DEFINED (fixP->fx_addsy) 279 || S_GET_SEGMENT (fixP->fx_addsy) != sec)) 280 /* The symbol is undefined (or is defined but not in this section). 281 Let the linker figure it out. */ 282 return 0; 283 284 return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1; 285 } 286 287 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. 288 Returns BFD_RELOC_NONE if no reloc type can be found. 289 *FIXP may be modified if desired. */ 290 291 bfd_reloc_code_real_type 292 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED, 293 const CGEN_OPERAND *operand, 294 fixS *fixP) 295 { 296 switch (operand->type) 297 { 298 case FR30_OPERAND_LABEL9: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL; 299 case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL; 300 case FR30_OPERAND_DISP10: return BFD_RELOC_FR30_10_IN_8; 301 case FR30_OPERAND_DISP9: return BFD_RELOC_FR30_9_IN_8; 302 case FR30_OPERAND_DISP8: return BFD_RELOC_FR30_8_IN_8; 303 case FR30_OPERAND_UDISP6: return BFD_RELOC_FR30_6_IN_4; 304 case FR30_OPERAND_I8: return BFD_RELOC_8; 305 case FR30_OPERAND_I32: return BFD_RELOC_FR30_48; 306 case FR30_OPERAND_I20: return BFD_RELOC_FR30_20; 307 default : /* Avoid -Wall warning. */ 308 break; 309 } 310 311 return BFD_RELOC_NONE; 312 } 313 314 /* Write a value out to the object file, using the appropriate endianness. */ 315 316 void 317 md_number_to_chars (char * buf, valueT val, int n) 318 { 319 number_to_chars_bigendian (buf, val, n); 320 } 321 322 /* Turn a string in input_line_pointer into a floating point constant of type 323 type, and store the appropriate bytes in *litP. The number of LITTLENUMS 324 emitted is stored in *sizeP . An error message is returned, or NULL on OK. 325 */ 326 327 /* Equal to MAX_PRECISION in atof-ieee.c. */ 328 #define MAX_LITTLENUMS 6 329 330 char * 331 md_atof (int type, char * litP, int * sizeP) 332 { 333 int i; 334 int prec; 335 LITTLENUM_TYPE words [MAX_LITTLENUMS]; 336 char * t; 337 338 switch (type) 339 { 340 case 'f': 341 case 'F': 342 case 's': 343 case 'S': 344 prec = 2; 345 break; 346 347 case 'd': 348 case 'D': 349 case 'r': 350 case 'R': 351 prec = 4; 352 break; 353 354 /* FIXME: Some targets allow other format chars for bigger sizes here. */ 355 356 default: 357 * sizeP = 0; 358 return _("Bad call to md_atof()"); 359 } 360 361 t = atof_ieee (input_line_pointer, type, words); 362 if (t) 363 input_line_pointer = t; 364 * sizeP = prec * sizeof (LITTLENUM_TYPE); 365 366 for (i = 0; i < prec; i++) 367 { 368 md_number_to_chars (litP, (valueT) words[i], 369 sizeof (LITTLENUM_TYPE)); 370 litP += sizeof (LITTLENUM_TYPE); 371 } 372 373 return 0; 374 } 375 376 /* Worker function for fr30_is_colon_insn(). */ 377 static char 378 restore_colon (int advance_i_l_p_by) 379 { 380 char c; 381 382 /* Restore the colon, and advance input_line_pointer to 383 the end of the new symbol. */ 384 * input_line_pointer = ':'; 385 input_line_pointer += advance_i_l_p_by; 386 c = * input_line_pointer; 387 * input_line_pointer = 0; 388 389 return c; 390 } 391 392 /* Determines if the symbol starting at START and ending in 393 a colon that was at the location pointed to by INPUT_LINE_POINTER 394 (but which has now been replaced bu a NUL) is in fact an 395 LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction. 396 If it is, then it restores the colon, advances INPUT_LINE_POINTER 397 to the real end of the instruction/symbol, and returns the character 398 that really terminated the symbol. Otherwise it returns 0. */ 399 char 400 fr30_is_colon_insn (char * start) 401 { 402 char * i_l_p = input_line_pointer; 403 404 /* Check to see if the symbol parsed so far is 'ldi'. */ 405 if ( (start[0] != 'l' && start[0] != 'L') 406 || (start[1] != 'd' && start[1] != 'D') 407 || (start[2] != 'i' && start[2] != 'I') 408 || start[3] != 0) 409 { 410 /* Nope - check to see a 'd' follows the colon. */ 411 if ( (i_l_p[1] == 'd' || i_l_p[1] == 'D') 412 && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n')) 413 { 414 /* Yup - it might be delay slot instruction. */ 415 int i; 416 static char * delay_insns [] = 417 { 418 "call", "jmp", "ret", "bra", "bno", 419 "beq", "bne", "bc", "bnc", "bn", 420 "bp", "bv", "bnv", "blt", "bge", 421 "ble", "bgt", "bls", "bhi" 422 }; 423 424 for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;) 425 { 426 char * insn = delay_insns[i]; 427 int len = strlen (insn); 428 429 if (start [len] != 0) 430 continue; 431 432 while (len --) 433 if (TOLOWER (start [len]) != insn [len]) 434 break; 435 436 if (len == -1) 437 return restore_colon (1); 438 } 439 } 440 441 /* Nope - it is a normal label. */ 442 return 0; 443 } 444 445 /* Check to see if the text following the colon is '8'. */ 446 if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t')) 447 return restore_colon (2); 448 449 /* Check to see if the text following the colon is '20'. */ 450 else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t')) 451 return restore_colon (3); 452 453 /* Check to see if the text following the colon is '32'. */ 454 else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t')) 455 return restore_colon (3); 456 457 return 0; 458 } 459 460 bfd_boolean 461 fr30_fix_adjustable (fixS * fixP) 462 { 463 /* We need the symbol name for the VTABLE entries. */ 464 if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT 465 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) 466 return 0; 467 468 return 1; 469 } 470