1 /* tc-fr30.c -- Assembler for the Fujitsu FR30. 2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2009 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 3, 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 "as.h" 23 #include "safe-ctype.h" 24 #include "subsegs.h" 25 #include "symcat.h" 26 #include "opcodes/fr30-desc.h" 27 #include "opcodes/fr30-opc.h" 28 #include "cgen.h" 29 30 /* Structure to hold all of the different components describing 31 an individual instruction. */ 32 typedef struct 33 { 34 const CGEN_INSN * insn; 35 const CGEN_INSN * orig_insn; 36 CGEN_FIELDS fields; 37 #if CGEN_INT_INSN_P 38 CGEN_INSN_INT buffer [1]; 39 #define INSN_VALUE(buf) (*(buf)) 40 #else 41 unsigned char buffer [CGEN_MAX_INSN_SIZE]; 42 #define INSN_VALUE(buf) (buf) 43 #endif 44 char * addr; 45 fragS * frag; 46 int num_fixups; 47 fixS * fixups [GAS_CGEN_MAX_FIXUPS]; 48 int indices [MAX_OPERAND_INSTANCES]; 49 } 50 fr30_insn; 51 52 const char comment_chars[] = ";"; 53 const char line_comment_chars[] = "#"; 54 const char line_separator_chars[] = "|"; 55 const char EXP_CHARS[] = "eE"; 56 const char FLT_CHARS[] = "dD"; 57 58 #define FR30_SHORTOPTS "" 59 const char * md_shortopts = FR30_SHORTOPTS; 60 61 struct option md_longopts[] = 62 { 63 {NULL, no_argument, NULL, 0} 64 }; 65 size_t md_longopts_size = sizeof (md_longopts); 66 67 int 68 md_parse_option (int c ATTRIBUTE_UNUSED, 69 char *arg ATTRIBUTE_UNUSED) 70 { 71 switch (c) 72 { 73 default: 74 return 0; 75 } 76 return 1; 77 } 78 79 void 80 md_show_usage (FILE * stream) 81 { 82 fprintf (stream, _(" FR30 specific command line options:\n")); 83 } 84 85 /* The target specific pseudo-ops which we support. */ 86 const pseudo_typeS md_pseudo_table[] = 87 { 88 { "word", cons, 4 }, 89 { NULL, NULL, 0 } 90 }; 91 92 93 void 94 md_begin (void) 95 { 96 /* Initialize the `cgen' interface. */ 97 98 /* Set the machine number and endian. */ 99 gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0, 100 CGEN_CPU_OPEN_ENDIAN, 101 CGEN_ENDIAN_BIG, 102 CGEN_CPU_OPEN_END); 103 fr30_cgen_init_asm (gas_cgen_cpu_desc); 104 105 /* This is a callback from cgen to gas to parse operands. */ 106 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); 107 } 108 109 void 110 md_assemble (char *str) 111 { 112 static int last_insn_had_delay_slot = 0; 113 fr30_insn insn; 114 char *errmsg; 115 116 /* Initialize GAS's cgen interface for a new instruction. */ 117 gas_cgen_init_parse (); 118 119 insn.insn = fr30_cgen_assemble_insn 120 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); 121 122 if (!insn.insn) 123 { 124 as_bad ("%s", errmsg); 125 return; 126 } 127 128 /* Doesn't really matter what we pass for RELAX_P here. */ 129 gas_cgen_finish_insn (insn.insn, insn.buffer, 130 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL); 131 132 /* Warn about invalid insns in delay slots. */ 133 if (last_insn_had_delay_slot 134 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT)) 135 as_warn (_("Instruction %s not allowed in a delay slot."), 136 CGEN_INSN_NAME (insn.insn)); 137 138 last_insn_had_delay_slot 139 = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT); 140 } 141 142 /* The syntax in the manual says constants begin with '#'. 143 We just ignore it. */ 144 145 void 146 md_operand (expressionS * expressionP) 147 { 148 if (* input_line_pointer == '#') 149 { 150 input_line_pointer ++; 151 expression (expressionP); 152 } 153 } 154 155 valueT 156 md_section_align (segT segment, valueT size) 157 { 158 int align = bfd_get_section_alignment (stdoutput, segment); 159 160 return ((size + (1 << align) - 1) & (-1 << align)); 161 } 162 163 symbolS * 164 md_undefined_symbol (char *name ATTRIBUTE_UNUSED) 165 { 166 return NULL; 167 } 168 169 /* Interface to relax_segment. */ 170 171 /* FIXME: Build table by hand, get it working, then machine generate. */ 172 173 const relax_typeS md_relax_table[] = 174 { 175 /* The fields are: 176 1) most positive reach of this state, 177 2) most negative reach of this state, 178 3) how many bytes this mode will add to the size of the current frag 179 4) which index into the table to try if we can't fit into this one. */ 180 181 /* The first entry must be unused because an `rlx_more' value of zero ends 182 each list. */ 183 {1, 1, 0, 0}, 184 185 /* The displacement used by GAS is from the end of the 2 byte insn, 186 so we subtract 2 from the following. */ 187 /* 16 bit insn, 8 bit disp -> 10 bit range. 188 This doesn't handle a branch in the right slot at the border: 189 the "& -4" isn't taken into account. It's not important enough to 190 complicate things over it, so we subtract an extra 2 (or + 2 in -ve 191 case). */ 192 {511 - 2 - 2, -512 - 2 + 2, 0, 2 }, 193 /* 32 bit insn, 24 bit disp -> 26 bit range. */ 194 {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 }, 195 /* Same thing, but with leading nop for alignment. */ 196 {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 } 197 }; 198 199 /* Return an initial guess of the length by which a fragment must grow to 200 hold a branch to reach its destination. 201 Also updates fr_type/fr_subtype as necessary. 202 203 Called just before doing relaxation. 204 Any symbol that is now undefined will not become defined. 205 The guess for fr_var is ACTUALLY the growth beyond fr_fix. 206 Whatever we do to grow fr_fix or fr_var contributes to our returned value. 207 Although it may not be explicit in the frag, pretend fr_var starts with a 208 0 value. */ 209 210 int 211 md_estimate_size_before_relax (fragS * fragP, segT segment) 212 { 213 /* The only thing we have to handle here are symbols outside of the 214 current segment. They may be undefined or in a different segment in 215 which case linker scripts may place them anywhere. 216 However, we can't finish the fragment here and emit the reloc as insn 217 alignment requirements may move the insn about. */ 218 219 if (S_GET_SEGMENT (fragP->fr_symbol) != segment) 220 { 221 /* The symbol is undefined in this segment. 222 Change the relaxation subtype to the max allowable and leave 223 all further handling to md_convert_frag. */ 224 fragP->fr_subtype = 2; 225 226 { 227 const CGEN_INSN * insn; 228 int i; 229 230 /* Update the recorded insn. 231 Fortunately we don't have to look very far. 232 FIXME: Change this to record in the instruction the next higher 233 relaxable insn to use. */ 234 for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++) 235 { 236 if ((strcmp (CGEN_INSN_MNEMONIC (insn), 237 CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn)) 238 == 0) 239 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED)) 240 break; 241 } 242 if (i == 4) 243 abort (); 244 245 fragP->fr_cgen.insn = insn; 246 return 2; 247 } 248 } 249 250 /* Return the size of the variable part of the frag. */ 251 return md_relax_table[fragP->fr_subtype].rlx_length; 252 } 253 254 /* *fragP has been relaxed to its final size, and now needs to have 255 the bytes inside it modified to conform to the new size. 256 257 Called after relaxation is finished. 258 fragP->fr_type == rs_machine_dependent. 259 fragP->fr_subtype is the subtype of what the address relaxed to. */ 260 261 void 262 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED, 263 segT sec ATTRIBUTE_UNUSED, 264 fragS *fragP ATTRIBUTE_UNUSED) 265 { 266 } 267 268 /* Functions concerning relocs. */ 269 270 /* The location from which a PC relative jump should be calculated, 271 given a PC relative reloc. */ 272 273 long 274 md_pcrel_from_section (fixS * fixP, segT sec) 275 { 276 if (fixP->fx_addsy != (symbolS *) NULL 277 && (! S_IS_DEFINED (fixP->fx_addsy) 278 || S_GET_SEGMENT (fixP->fx_addsy) != sec)) 279 /* The symbol is undefined (or is defined but not in this section). 280 Let the linker figure it out. */ 281 return 0; 282 283 return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1; 284 } 285 286 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. 287 Returns BFD_RELOC_NONE if no reloc type can be found. 288 *FIXP may be modified if desired. */ 289 290 bfd_reloc_code_real_type 291 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED, 292 const CGEN_OPERAND *operand, 293 fixS *fixP) 294 { 295 switch (operand->type) 296 { 297 case FR30_OPERAND_LABEL9: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL; 298 case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL; 299 case FR30_OPERAND_DISP10: return BFD_RELOC_FR30_10_IN_8; 300 case FR30_OPERAND_DISP9: return BFD_RELOC_FR30_9_IN_8; 301 case FR30_OPERAND_DISP8: return BFD_RELOC_FR30_8_IN_8; 302 case FR30_OPERAND_UDISP6: return BFD_RELOC_FR30_6_IN_4; 303 case FR30_OPERAND_I8: return BFD_RELOC_8; 304 case FR30_OPERAND_I32: return BFD_RELOC_FR30_48; 305 case FR30_OPERAND_I20: return BFD_RELOC_FR30_20; 306 default : /* Avoid -Wall warning. */ 307 break; 308 } 309 310 return BFD_RELOC_NONE; 311 } 312 313 /* Write a value out to the object file, using the appropriate endianness. */ 314 315 void 316 md_number_to_chars (char * buf, valueT val, int n) 317 { 318 number_to_chars_bigendian (buf, val, n); 319 } 320 321 char * 322 md_atof (int type, char * litP, int * sizeP) 323 { 324 return ieee_md_atof (type, litP, sizeP, TRUE); 325 } 326 327 /* Worker function for fr30_is_colon_insn(). */ 328 static char 329 restore_colon (int advance_i_l_p_by) 330 { 331 char c; 332 333 /* Restore the colon, and advance input_line_pointer to 334 the end of the new symbol. */ 335 * input_line_pointer = ':'; 336 input_line_pointer += advance_i_l_p_by; 337 c = * input_line_pointer; 338 * input_line_pointer = 0; 339 340 return c; 341 } 342 343 /* Determines if the symbol starting at START and ending in 344 a colon that was at the location pointed to by INPUT_LINE_POINTER 345 (but which has now been replaced bu a NUL) is in fact an 346 LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction. 347 If it is, then it restores the colon, advances INPUT_LINE_POINTER 348 to the real end of the instruction/symbol, and returns the character 349 that really terminated the symbol. Otherwise it returns 0. */ 350 char 351 fr30_is_colon_insn (char * start) 352 { 353 char * i_l_p = input_line_pointer; 354 355 /* Check to see if the symbol parsed so far is 'ldi'. */ 356 if ( (start[0] != 'l' && start[0] != 'L') 357 || (start[1] != 'd' && start[1] != 'D') 358 || (start[2] != 'i' && start[2] != 'I') 359 || start[3] != 0) 360 { 361 /* Nope - check to see a 'd' follows the colon. */ 362 if ( (i_l_p[1] == 'd' || i_l_p[1] == 'D') 363 && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n')) 364 { 365 /* Yup - it might be delay slot instruction. */ 366 int i; 367 static char * delay_insns [] = 368 { 369 "call", "jmp", "ret", "bra", "bno", 370 "beq", "bne", "bc", "bnc", "bn", 371 "bp", "bv", "bnv", "blt", "bge", 372 "ble", "bgt", "bls", "bhi" 373 }; 374 375 for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;) 376 { 377 char * insn = delay_insns[i]; 378 int len = strlen (insn); 379 380 if (start [len] != 0) 381 continue; 382 383 while (len --) 384 if (TOLOWER (start [len]) != insn [len]) 385 break; 386 387 if (len == -1) 388 return restore_colon (1); 389 } 390 } 391 392 /* Nope - it is a normal label. */ 393 return 0; 394 } 395 396 /* Check to see if the text following the colon is '8'. */ 397 if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t')) 398 return restore_colon (2); 399 400 /* Check to see if the text following the colon is '20'. */ 401 else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t')) 402 return restore_colon (3); 403 404 /* Check to see if the text following the colon is '32'. */ 405 else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t')) 406 return restore_colon (3); 407 408 return 0; 409 } 410 411 bfd_boolean 412 fr30_fix_adjustable (fixS * fixP) 413 { 414 /* We need the symbol name for the VTABLE entries. */ 415 if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT 416 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) 417 return 0; 418 419 return 1; 420 } 421