| 1 | /* tc-i960.c - All the i80960-specific stuff |
| 2 | Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
| 3 | 1999, 2000, 2001, 2002 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GAS. |
| 7 | |
| 8 | GAS is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 21 | 02111-1307, USA. */ |
| 22 | |
| 23 | /* See comment on md_parse_option for 80960-specific invocation options. */ |
| 24 | |
| 25 | /* There are 4 different lengths of (potentially) symbol-based displacements |
| 26 | in the 80960 instruction set, each of which could require address fix-ups |
| 27 | and (in the case of external symbols) emission of relocation directives: |
| 28 | |
| 29 | 32-bit (MEMB) |
| 30 | This is a standard length for the base assembler and requires no |
| 31 | special action. |
| 32 | |
| 33 | 13-bit (COBR) |
| 34 | This is a non-standard length, but the base assembler has a |
| 35 | hook for bit field address fixups: the fixS structure can |
| 36 | point to a descriptor of the field, in which case our |
| 37 | md_number_to_field() routine gets called to process it. |
| 38 | |
| 39 | I made the hook a little cleaner by having fix_new() (in the base |
| 40 | assembler) return a pointer to the fixS in question. And I made it a |
| 41 | little simpler by storing the field size (in this case 13) instead of |
| 42 | of a pointer to another structure: 80960 displacements are ALWAYS |
| 43 | stored in the low-order bits of a 4-byte word. |
| 44 | |
| 45 | Since the target of a COBR cannot be external, no relocation |
| 46 | directives for this size displacement have to be generated. |
| 47 | But the base assembler had to be modified to issue error |
| 48 | messages if the symbol did turn out to be external. |
| 49 | |
| 50 | 24-bit (CTRL) |
| 51 | Fixups are handled as for the 13-bit case (except that 24 is stored |
| 52 | in the fixS). |
| 53 | |
| 54 | The relocation directive generated is the same as that for the 32-bit |
| 55 | displacement, except that it's PC-relative (the 32-bit displacement |
| 56 | never is). The i80960 version of the linker needs a mod to |
| 57 | distinguish and handle the 24-bit case. |
| 58 | |
| 59 | 12-bit (MEMA) |
| 60 | MEMA formats are always promoted to MEMB (32-bit) if the displacement |
| 61 | is based on a symbol, because it could be relocated at link time. |
| 62 | The only time we use the 12-bit format is if an absolute value of |
| 63 | less than 4096 is specified, in which case we need neither a fixup nor |
| 64 | a relocation directive. */ |
| 65 | |
| 66 | #include <stdio.h> |
| 67 | |
| 68 | #include "as.h" |
| 69 | |
| 70 | #include "safe-ctype.h" |
| 71 | #include "obstack.h" |
| 72 | |
| 73 | #include "opcode/i960.h" |
| 74 | |
| 75 | #if defined (OBJ_AOUT) || defined (OBJ_BOUT) |
| 76 | |
| 77 | #define TC_S_IS_SYSPROC(s) ((1<=S_GET_OTHER(s)) && (S_GET_OTHER(s)<=32)) |
| 78 | #define TC_S_IS_BALNAME(s) (S_GET_OTHER(s) == N_BALNAME) |
| 79 | #define TC_S_IS_CALLNAME(s) (S_GET_OTHER(s) == N_CALLNAME) |
| 80 | #define TC_S_IS_BADPROC(s) ((S_GET_OTHER(s) != 0) && !TC_S_IS_CALLNAME(s) && !TC_S_IS_BALNAME(s) && !TC_S_IS_SYSPROC(s)) |
| 81 | |
| 82 | #define TC_S_SET_SYSPROC(s, p) (S_SET_OTHER((s), (p)+1)) |
| 83 | #define TC_S_GET_SYSPROC(s) (S_GET_OTHER(s)-1) |
| 84 | |
| 85 | #define TC_S_FORCE_TO_BALNAME(s) (S_SET_OTHER((s), N_BALNAME)) |
| 86 | #define TC_S_FORCE_TO_CALLNAME(s) (S_SET_OTHER((s), N_CALLNAME)) |
| 87 | #define TC_S_FORCE_TO_SYSPROC(s) {;} |
| 88 | |
| 89 | #else /* ! OBJ_A/BOUT */ |
| 90 | #ifdef OBJ_COFF |
| 91 | |
| 92 | #define TC_S_IS_SYSPROC(s) (S_GET_STORAGE_CLASS(s) == C_SCALL) |
| 93 | #define TC_S_IS_BALNAME(s) (SF_GET_BALNAME(s)) |
| 94 | #define TC_S_IS_CALLNAME(s) (SF_GET_CALLNAME(s)) |
| 95 | #define TC_S_IS_BADPROC(s) (TC_S_IS_SYSPROC(s) && TC_S_GET_SYSPROC(s) < 0 && 31 < TC_S_GET_SYSPROC(s)) |
| 96 | |
| 97 | #define TC_S_SET_SYSPROC(s, p) ((s)->sy_symbol.ost_auxent[1].x_sc.x_stindx = (p)) |
| 98 | #define TC_S_GET_SYSPROC(s) ((s)->sy_symbol.ost_auxent[1].x_sc.x_stindx) |
| 99 | |
| 100 | #define TC_S_FORCE_TO_BALNAME(s) (SF_SET_BALNAME(s)) |
| 101 | #define TC_S_FORCE_TO_CALLNAME(s) (SF_SET_CALLNAME(s)) |
| 102 | #define TC_S_FORCE_TO_SYSPROC(s) (S_SET_STORAGE_CLASS((s), C_SCALL)) |
| 103 | |
| 104 | #else /* ! OBJ_COFF */ |
| 105 | #ifdef OBJ_ELF |
| 106 | #define TC_S_IS_SYSPROC(s) 0 |
| 107 | |
| 108 | #define TC_S_IS_BALNAME(s) 0 |
| 109 | #define TC_S_IS_CALLNAME(s) 0 |
| 110 | #define TC_S_IS_BADPROC(s) 0 |
| 111 | |
| 112 | #define TC_S_SET_SYSPROC(s, p) |
| 113 | #define TC_S_GET_SYSPROC(s) 0 |
| 114 | |
| 115 | #define TC_S_FORCE_TO_BALNAME(s) |
| 116 | #define TC_S_FORCE_TO_CALLNAME(s) |
| 117 | #define TC_S_FORCE_TO_SYSPROC(s) |
| 118 | #else |
| 119 | #error COFF, a.out, b.out, and ELF are the only supported formats. |
| 120 | #endif /* ! OBJ_ELF */ |
| 121 | #endif /* ! OBJ_COFF */ |
| 122 | #endif /* ! OBJ_A/BOUT */ |
| 123 | |
| 124 | extern char *input_line_pointer; |
| 125 | |
| 126 | #if !defined (BFD_ASSEMBLER) && !defined (BFD) |
| 127 | #ifdef OBJ_COFF |
| 128 | const int md_reloc_size = sizeof (struct reloc); |
| 129 | #else /* OBJ_COFF */ |
| 130 | const int md_reloc_size = sizeof (struct relocation_info); |
| 131 | #endif /* OBJ_COFF */ |
| 132 | #endif |
| 133 | |
| 134 | /* Local i80960 routines. */ |
| 135 | struct memS; |
| 136 | struct regop; |
| 137 | |
| 138 | /* Emit branch-prediction instrumentation code */ |
| 139 | static void brcnt_emit PARAMS ((void)); |
| 140 | /* Return next branch local label */ |
| 141 | static char *brlab_next PARAMS ((void)); |
| 142 | /* Generate COBR instruction */ |
| 143 | static void cobr_fmt PARAMS ((char *[], long, struct i960_opcode *)); |
| 144 | /* Generate CTRL instruction */ |
| 145 | static void ctrl_fmt PARAMS ((char *, long, int)); |
| 146 | /* Emit (internally) binary */ |
| 147 | static char *emit PARAMS ((long)); |
| 148 | /* Break arguments out of comma-separated list */ |
| 149 | static int get_args PARAMS ((char *, char *[])); |
| 150 | /* Handle COBR or CTRL displacement */ |
| 151 | static void get_cdisp PARAMS ((char *, char *, long, int, int, int)); |
| 152 | /* Find index specification string */ |
| 153 | static char *get_ispec PARAMS ((char *)); |
| 154 | /* Translate text to register number */ |
| 155 | static int get_regnum PARAMS ((char *)); |
| 156 | /* Lexical scan of instruction source */ |
| 157 | static int i_scan PARAMS ((char *, char *[])); |
| 158 | /* Generate MEMA or MEMB instruction */ |
| 159 | static void mem_fmt PARAMS ((char *[], struct i960_opcode *, int)); |
| 160 | /* Convert MEMA instruction to MEMB format */ |
| 161 | static void mema_to_memb PARAMS ((char *)); |
| 162 | /* Parse an expression */ |
| 163 | static void parse_expr PARAMS ((char *, expressionS *)); |
| 164 | /* Parse and replace a 'ldconst' pseudo-op */ |
| 165 | static int parse_ldconst PARAMS ((char *[])); |
| 166 | /* Parse a memory operand */ |
| 167 | static void parse_memop PARAMS ((struct memS *, char *, int)); |
| 168 | /* Parse machine-dependent pseudo-op */ |
| 169 | static void parse_po PARAMS ((int)); |
| 170 | /* Parse a register operand */ |
| 171 | static void parse_regop PARAMS ((struct regop *, char *, char)); |
| 172 | /* Generate a REG format instruction */ |
| 173 | static void reg_fmt PARAMS ((char *[], struct i960_opcode *)); |
| 174 | /* "De-optimize" cobr into compare/branch */ |
| 175 | static void relax_cobr PARAMS ((fragS *)); |
| 176 | /* Process '.leafproc' pseudo-op */ |
| 177 | static void s_leafproc PARAMS ((int, char *[])); |
| 178 | /* Process '.sysproc' pseudo-op */ |
| 179 | static void s_sysproc PARAMS ((int, char *[])); |
| 180 | /* Will a 'shlo' substiture for a 'ldconst'? */ |
| 181 | static int shift_ok PARAMS ((int)); |
| 182 | /* Give syntax error */ |
| 183 | static void syntax PARAMS ((void)); |
| 184 | /* Target chip supports spec-func register? */ |
| 185 | static int targ_has_sfr PARAMS ((int)); |
| 186 | /* Target chip supports instruction set? */ |
| 187 | static int targ_has_iclass PARAMS ((int)); |
| 188 | |
| 189 | /* See md_parse_option() for meanings of these options */ |
| 190 | static char norelax; /* True if -norelax switch seen */ |
| 191 | static char instrument_branches; /* True if -b switch seen */ |
| 192 | |
| 193 | /* Characters that always start a comment. |
| 194 | If the pre-processor is disabled, these aren't very useful. |
| 195 | */ |
| 196 | const char comment_chars[] = "#"; |
| 197 | |
| 198 | /* Characters that only start a comment at the beginning of |
| 199 | a line. If the line seems to have the form '# 123 filename' |
| 200 | .line and .file directives will appear in the pre-processed output. |
| 201 | |
| 202 | Note that input_file.c hand checks for '#' at the beginning of the |
| 203 | first line of the input file. This is because the compiler outputs |
| 204 | #NO_APP at the beginning of its output. |
| 205 | */ |
| 206 | |
| 207 | /* Also note that comments started like this one will always work. */ |
| 208 | |
| 209 | const char line_comment_chars[] = ""; |
| 210 | |
| 211 | const char line_separator_chars[] = ";"; |
| 212 | |
| 213 | /* Chars that can be used to separate mant from exp in floating point nums */ |
| 214 | const char EXP_CHARS[] = "eE"; |
| 215 | |
| 216 | /* Chars that mean this number is a floating point constant, |
| 217 | as in 0f12.456 or 0d1.2345e12 |
| 218 | */ |
| 219 | const char FLT_CHARS[] = "fFdDtT"; |
| 220 | |
| 221 | /* Table used by base assembler to relax addresses based on varying length |
| 222 | instructions. The fields are: |
| 223 | 1) most positive reach of this state, |
| 224 | 2) most negative reach of this state, |
| 225 | 3) how many bytes this mode will add to the size of the current frag |
| 226 | 4) which index into the table to try if we can't fit into this one. |
| 227 | |
| 228 | For i80960, the only application is the (de-)optimization of cobr |
| 229 | instructions into separate compare and branch instructions when a 13-bit |
| 230 | displacement won't hack it. |
| 231 | */ |
| 232 | const relax_typeS md_relax_table[] = |
| 233 | { |
| 234 | {0, 0, 0, 0}, /* State 0 => no more relaxation possible */ |
| 235 | {4088, -4096, 0, 2}, /* State 1: conditional branch (cobr) */ |
| 236 | {0x800000 - 8, -0x800000, 4, 0}, /* State 2: compare (reg) & branch (ctrl) */ |
| 237 | }; |
| 238 | |
| 239 | static void s_endian PARAMS ((int)); |
| 240 | |
| 241 | /* These are the machine dependent pseudo-ops. |
| 242 | |
| 243 | This table describes all the machine specific pseudo-ops the assembler |
| 244 | has to support. The fields are: |
| 245 | pseudo-op name without dot |
| 246 | function to call to execute this pseudo-op |
| 247 | integer arg to pass to the function |
| 248 | */ |
| 249 | #define S_LEAFPROC 1 |
| 250 | #define S_SYSPROC 2 |
| 251 | |
| 252 | const pseudo_typeS md_pseudo_table[] = |
| 253 | { |
| 254 | {"bss", s_lcomm, 1}, |
| 255 | {"endian", s_endian, 0}, |
| 256 | {"extended", float_cons, 't'}, |
| 257 | {"leafproc", parse_po, S_LEAFPROC}, |
| 258 | {"sysproc", parse_po, S_SYSPROC}, |
| 259 | |
| 260 | {"word", cons, 4}, |
| 261 | {"quad", cons, 16}, |
| 262 | |
| 263 | {0, 0, 0} |
| 264 | }; |
| 265 | \f |
| 266 | /* Macros to extract info from an 'expressionS' structure 'e' */ |
| 267 | #define adds(e) e.X_add_symbol |
| 268 | #define offs(e) e.X_add_number |
| 269 | |
| 270 | /* Branch-prediction bits for CTRL/COBR format opcodes */ |
| 271 | #define BP_MASK 0x00000002 /* Mask for branch-prediction bit */ |
| 272 | #define BP_TAKEN 0x00000000 /* Value to OR in to predict branch */ |
| 273 | #define BP_NOT_TAKEN 0x00000002 /* Value to OR in to predict no branch */ |
| 274 | |
| 275 | /* Some instruction opcodes that we need explicitly */ |
| 276 | #define BE 0x12000000 |
| 277 | #define BG 0x11000000 |
| 278 | #define BGE 0x13000000 |
| 279 | #define BL 0x14000000 |
| 280 | #define BLE 0x16000000 |
| 281 | #define BNE 0x15000000 |
| 282 | #define BNO 0x10000000 |
| 283 | #define BO 0x17000000 |
| 284 | #define CHKBIT 0x5a002700 |
| 285 | #define CMPI 0x5a002080 |
| 286 | #define CMPO 0x5a002000 |
| 287 | |
| 288 | #define B 0x08000000 |
| 289 | #define BAL 0x0b000000 |
| 290 | #define CALL 0x09000000 |
| 291 | #define CALLS 0x66003800 |
| 292 | #define RET 0x0a000000 |
| 293 | |
| 294 | /* These masks are used to build up a set of MEMB mode bits. */ |
| 295 | #define A_BIT 0x0400 |
| 296 | #define I_BIT 0x0800 |
| 297 | #define MEMB_BIT 0x1000 |
| 298 | #define D_BIT 0x2000 |
| 299 | |
| 300 | /* Mask for the only mode bit in a MEMA instruction (if set, abase reg is |
| 301 | used). */ |
| 302 | #define MEMA_ABASE 0x2000 |
| 303 | |
| 304 | /* Info from which a MEMA or MEMB format instruction can be generated */ |
| 305 | typedef struct memS |
| 306 | { |
| 307 | /* (First) 32 bits of instruction */ |
| 308 | long opcode; |
| 309 | /* 0-(none), 12- or, 32-bit displacement needed */ |
| 310 | int disp; |
| 311 | /* The expression in the source instruction from which the |
| 312 | displacement should be determined. */ |
| 313 | char *e; |
| 314 | } |
| 315 | memS; |
| 316 | |
| 317 | /* The two pieces of info we need to generate a register operand */ |
| 318 | struct regop |
| 319 | { |
| 320 | int mode; /* 0 =>local/global/spec reg; 1=> literal or fp reg */ |
| 321 | int special; /* 0 =>not a sfr; 1=> is a sfr (not valid w/mode=0) */ |
| 322 | int n; /* Register number or literal value */ |
| 323 | }; |
| 324 | |
| 325 | /* Number and assembler mnemonic for all registers that can appear in |
| 326 | operands. */ |
| 327 | static const struct |
| 328 | { |
| 329 | char *reg_name; |
| 330 | int reg_num; |
| 331 | } |
| 332 | regnames[] = |
| 333 | { |
| 334 | { "pfp", 0 }, |
| 335 | { "sp", 1 }, |
| 336 | { "rip", 2 }, |
| 337 | { "r3", 3 }, |
| 338 | { "r4", 4 }, |
| 339 | { "r5", 5 }, |
| 340 | { "r6", 6 }, |
| 341 | { "r7", 7 }, |
| 342 | { "r8", 8 }, |
| 343 | { "r9", 9 }, |
| 344 | { "r10", 10 }, |
| 345 | { "r11", 11 }, |
| 346 | { "r12", 12 }, |
| 347 | { "r13", 13 }, |
| 348 | { "r14", 14 }, |
| 349 | { "r15", 15 }, |
| 350 | { "g0", 16 }, |
| 351 | { "g1", 17 }, |
| 352 | { "g2", 18 }, |
| 353 | { "g3", 19 }, |
| 354 | { "g4", 20 }, |
| 355 | { "g5", 21 }, |
| 356 | { "g6", 22 }, |
| 357 | { "g7", 23 }, |
| 358 | { "g8", 24 }, |
| 359 | { "g9", 25 }, |
| 360 | { "g10", 26 }, |
| 361 | { "g11", 27 }, |
| 362 | { "g12", 28 }, |
| 363 | { "g13", 29 }, |
| 364 | { "g14", 30 }, |
| 365 | { "fp", 31 }, |
| 366 | |
| 367 | /* Numbers for special-function registers are for assembler internal |
| 368 | use only: they are scaled back to range [0-31] for binary output. */ |
| 369 | #define SF0 32 |
| 370 | |
| 371 | { "sf0", 32 }, |
| 372 | { "sf1", 33 }, |
| 373 | { "sf2", 34 }, |
| 374 | { "sf3", 35 }, |
| 375 | { "sf4", 36 }, |
| 376 | { "sf5", 37 }, |
| 377 | { "sf6", 38 }, |
| 378 | { "sf7", 39 }, |
| 379 | { "sf8", 40 }, |
| 380 | { "sf9", 41 }, |
| 381 | { "sf10", 42 }, |
| 382 | { "sf11", 43 }, |
| 383 | { "sf12", 44 }, |
| 384 | { "sf13", 45 }, |
| 385 | { "sf14", 46 }, |
| 386 | { "sf15", 47 }, |
| 387 | { "sf16", 48 }, |
| 388 | { "sf17", 49 }, |
| 389 | { "sf18", 50 }, |
| 390 | { "sf19", 51 }, |
| 391 | { "sf20", 52 }, |
| 392 | { "sf21", 53 }, |
| 393 | { "sf22", 54 }, |
| 394 | { "sf23", 55 }, |
| 395 | { "sf24", 56 }, |
| 396 | { "sf25", 57 }, |
| 397 | { "sf26", 58 }, |
| 398 | { "sf27", 59 }, |
| 399 | { "sf28", 60 }, |
| 400 | { "sf29", 61 }, |
| 401 | { "sf30", 62 }, |
| 402 | { "sf31", 63 }, |
| 403 | |
| 404 | /* Numbers for floating point registers are for assembler internal |
| 405 | use only: they are scaled back to [0-3] for binary output. */ |
| 406 | #define FP0 64 |
| 407 | |
| 408 | { "fp0", 64 }, |
| 409 | { "fp1", 65 }, |
| 410 | { "fp2", 66 }, |
| 411 | { "fp3", 67 }, |
| 412 | |
| 413 | { NULL, 0 }, /* END OF LIST */ |
| 414 | }; |
| 415 | |
| 416 | #define IS_RG_REG(n) ((0 <= (n)) && ((n) < SF0)) |
| 417 | #define IS_SF_REG(n) ((SF0 <= (n)) && ((n) < FP0)) |
| 418 | #define IS_FP_REG(n) ((n) >= FP0) |
| 419 | |
| 420 | /* Number and assembler mnemonic for all registers that can appear as |
| 421 | 'abase' (indirect addressing) registers. */ |
| 422 | static const struct |
| 423 | { |
| 424 | char *areg_name; |
| 425 | int areg_num; |
| 426 | } |
| 427 | aregs[] = |
| 428 | { |
| 429 | { "(pfp)", 0 }, |
| 430 | { "(sp)", 1 }, |
| 431 | { "(rip)", 2 }, |
| 432 | { "(r3)", 3 }, |
| 433 | { "(r4)", 4 }, |
| 434 | { "(r5)", 5 }, |
| 435 | { "(r6)", 6 }, |
| 436 | { "(r7)", 7 }, |
| 437 | { "(r8)", 8 }, |
| 438 | { "(r9)", 9 }, |
| 439 | { "(r10)", 10 }, |
| 440 | { "(r11)", 11 }, |
| 441 | { "(r12)", 12 }, |
| 442 | { "(r13)", 13 }, |
| 443 | { "(r14)", 14 }, |
| 444 | { "(r15)", 15 }, |
| 445 | { "(g0)", 16 }, |
| 446 | { "(g1)", 17 }, |
| 447 | { "(g2)", 18 }, |
| 448 | { "(g3)", 19 }, |
| 449 | { "(g4)", 20 }, |
| 450 | { "(g5)", 21 }, |
| 451 | { "(g6)", 22 }, |
| 452 | { "(g7)", 23 }, |
| 453 | { "(g8)", 24 }, |
| 454 | { "(g9)", 25 }, |
| 455 | { "(g10)", 26 }, |
| 456 | { "(g11)", 27 }, |
| 457 | { "(g12)", 28 }, |
| 458 | { "(g13)", 29 }, |
| 459 | { "(g14)", 30 }, |
| 460 | { "(fp)", 31 }, |
| 461 | |
| 462 | #define IPREL 32 |
| 463 | /* For assembler internal use only: this number never appears in binary |
| 464 | output. */ |
| 465 | { "(ip)", IPREL }, |
| 466 | |
| 467 | { NULL, 0 }, /* END OF LIST */ |
| 468 | }; |
| 469 | |
| 470 | /* Hash tables */ |
| 471 | static struct hash_control *op_hash; /* Opcode mnemonics */ |
| 472 | static struct hash_control *reg_hash; /* Register name hash table */ |
| 473 | static struct hash_control *areg_hash; /* Abase register hash table */ |
| 474 | |
| 475 | /* Architecture for which we are assembling */ |
| 476 | #define ARCH_ANY 0 /* Default: no architecture checking done */ |
| 477 | #define ARCH_KA 1 |
| 478 | #define ARCH_KB 2 |
| 479 | #define ARCH_MC 3 |
| 480 | #define ARCH_CA 4 |
| 481 | #define ARCH_JX 5 |
| 482 | #define ARCH_HX 6 |
| 483 | int architecture = ARCH_ANY; /* Architecture requested on invocation line */ |
| 484 | int iclasses_seen; /* OR of instruction classes (I_* constants) |
| 485 | * for which we've actually assembled |
| 486 | * instructions. |
| 487 | */ |
| 488 | |
| 489 | /* BRANCH-PREDICTION INSTRUMENTATION |
| 490 | |
| 491 | The following supports generation of branch-prediction instrumentation |
| 492 | (turned on by -b switch). The instrumentation collects counts |
| 493 | of branches taken/not-taken for later input to a utility that will |
| 494 | set the branch prediction bits of the instructions in accordance with |
| 495 | the behavior observed. (Note that the KX series does not have |
| 496 | brach-prediction.) |
| 497 | |
| 498 | The instrumentation consists of: |
| 499 | |
| 500 | (1) before and after each conditional branch, a call to an external |
| 501 | routine that increments and steps over an inline counter. The |
| 502 | counter itself, initialized to 0, immediately follows the call |
| 503 | instruction. For each branch, the counter following the branch |
| 504 | is the number of times the branch was not taken, and the difference |
| 505 | between the counters is the number of times it was taken. An |
| 506 | example of an instrumented conditional branch: |
| 507 | |
| 508 | call BR_CNT_FUNC |
| 509 | .word 0 |
| 510 | LBRANCH23: be label |
| 511 | call BR_CNT_FUNC |
| 512 | .word 0 |
| 513 | |
| 514 | (2) a table of pointers to the instrumented branches, so that an |
| 515 | external postprocessing routine can locate all of the counters. |
| 516 | the table begins with a 2-word header: a pointer to the next in |
| 517 | a linked list of such tables (initialized to 0); and a count |
| 518 | of the number of entries in the table (exclusive of the header. |
| 519 | |
| 520 | Note that input source code is expected to already contain calls |
| 521 | an external routine that will link the branch local table into a |
| 522 | list of such tables. |
| 523 | */ |
| 524 | |
| 525 | /* Number of branches instrumented so far. Also used to generate |
| 526 | unique local labels for each instrumented branch. */ |
| 527 | static int br_cnt; |
| 528 | |
| 529 | #define BR_LABEL_BASE "LBRANCH" |
| 530 | /* Basename of local labels on instrumented branches, to avoid |
| 531 | conflict with compiler- generated local labels. */ |
| 532 | |
| 533 | #define BR_CNT_FUNC "__inc_branch" |
| 534 | /* Name of the external routine that will increment (and step over) an |
| 535 | inline counter. */ |
| 536 | |
| 537 | #define BR_TAB_NAME "__BRANCH_TABLE__" |
| 538 | /* Name of the table of pointers to branches. A local (i.e., |
| 539 | non-external) symbol. */ |
| 540 | \f |
| 541 | /***************************************************************************** |
| 542 | md_begin: One-time initialization. |
| 543 | |
| 544 | Set up hash tables. |
| 545 | |
| 546 | *************************************************************************** */ |
| 547 | void |
| 548 | md_begin () |
| 549 | { |
| 550 | int i; /* Loop counter */ |
| 551 | const struct i960_opcode *oP; /* Pointer into opcode table */ |
| 552 | const char *retval; /* Value returned by hash functions */ |
| 553 | |
| 554 | op_hash = hash_new (); |
| 555 | reg_hash = hash_new (); |
| 556 | areg_hash = hash_new (); |
| 557 | |
| 558 | /* For some reason, the base assembler uses an empty string for "no |
| 559 | error message", instead of a NULL pointer. */ |
| 560 | retval = 0; |
| 561 | |
| 562 | for (oP = i960_opcodes; oP->name && !retval; oP++) |
| 563 | retval = hash_insert (op_hash, oP->name, (PTR) oP); |
| 564 | |
| 565 | for (i = 0; regnames[i].reg_name && !retval; i++) |
| 566 | retval = hash_insert (reg_hash, regnames[i].reg_name, |
| 567 | (char *) ®names[i].reg_num); |
| 568 | |
| 569 | for (i = 0; aregs[i].areg_name && !retval; i++) |
| 570 | retval = hash_insert (areg_hash, aregs[i].areg_name, |
| 571 | (char *) &aregs[i].areg_num); |
| 572 | |
| 573 | if (retval) |
| 574 | as_fatal (_("Hashing returned \"%s\"."), retval); |
| 575 | } |
| 576 | |
| 577 | /***************************************************************************** |
| 578 | md_assemble: Assemble an instruction |
| 579 | |
| 580 | Assumptions about the passed-in text: |
| 581 | - all comments, labels removed |
| 582 | - text is an instruction |
| 583 | - all white space compressed to single blanks |
| 584 | - all character constants have been replaced with decimal |
| 585 | |
| 586 | *************************************************************************** */ |
| 587 | void |
| 588 | md_assemble (textP) |
| 589 | char *textP; /* Source text of instruction */ |
| 590 | { |
| 591 | /* Parsed instruction text, containing NO whitespace: arg[0]->opcode |
| 592 | mnemonic arg[1-3]->operands, with char constants replaced by |
| 593 | decimal numbers. */ |
| 594 | char *args[4]; |
| 595 | |
| 596 | int n_ops; /* Number of instruction operands */ |
| 597 | /* Pointer to instruction description */ |
| 598 | struct i960_opcode *oP; |
| 599 | /* TRUE iff opcode mnemonic included branch-prediction suffix (".f" |
| 600 | or ".t"). */ |
| 601 | int branch_predict; |
| 602 | /* Setting of branch-prediction bit(s) to be OR'd into instruction |
| 603 | opcode of CTRL/COBR format instructions. */ |
| 604 | long bp_bits; |
| 605 | |
| 606 | int n; /* Offset of last character in opcode mnemonic */ |
| 607 | |
| 608 | const char *bp_error_msg = _("branch prediction invalid on this opcode"); |
| 609 | |
| 610 | /* Parse instruction into opcode and operands */ |
| 611 | memset (args, '\0', sizeof (args)); |
| 612 | n_ops = i_scan (textP, args); |
| 613 | if (n_ops == -1) |
| 614 | { |
| 615 | return; /* Error message already issued */ |
| 616 | } |
| 617 | |
| 618 | /* Do "macro substitution" (sort of) on 'ldconst' pseudo-instruction */ |
| 619 | if (!strcmp (args[0], "ldconst")) |
| 620 | { |
| 621 | n_ops = parse_ldconst (args); |
| 622 | if (n_ops == -1) |
| 623 | { |
| 624 | return; |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | /* Check for branch-prediction suffix on opcode mnemonic, strip it off */ |
| 629 | n = strlen (args[0]) - 1; |
| 630 | branch_predict = 0; |
| 631 | bp_bits = 0; |
| 632 | if (args[0][n - 1] == '.' && (args[0][n] == 't' || args[0][n] == 'f')) |
| 633 | { |
| 634 | /* We could check here to see if the target architecture |
| 635 | supports branch prediction, but why bother? The bit will |
| 636 | just be ignored by processors that don't use it. */ |
| 637 | branch_predict = 1; |
| 638 | bp_bits = (args[0][n] == 't') ? BP_TAKEN : BP_NOT_TAKEN; |
| 639 | args[0][n - 1] = '\0'; /* Strip suffix from opcode mnemonic */ |
| 640 | } |
| 641 | |
| 642 | /* Look up opcode mnemonic in table and check number of operands. |
| 643 | Check that opcode is legal for the target architecture. If all |
| 644 | looks good, assemble instruction. */ |
| 645 | oP = (struct i960_opcode *) hash_find (op_hash, args[0]); |
| 646 | if (!oP || !targ_has_iclass (oP->iclass)) |
| 647 | { |
| 648 | as_bad (_("invalid opcode, \"%s\"."), args[0]); |
| 649 | |
| 650 | } |
| 651 | else if (n_ops != oP->num_ops) |
| 652 | { |
| 653 | as_bad (_("improper number of operands. expecting %d, got %d"), |
| 654 | oP->num_ops, n_ops); |
| 655 | } |
| 656 | else |
| 657 | { |
| 658 | switch (oP->format) |
| 659 | { |
| 660 | case FBRA: |
| 661 | case CTRL: |
| 662 | ctrl_fmt (args[1], oP->opcode | bp_bits, oP->num_ops); |
| 663 | if (oP->format == FBRA) |
| 664 | { |
| 665 | /* Now generate a 'bno' to same arg */ |
| 666 | ctrl_fmt (args[1], BNO | bp_bits, 1); |
| 667 | } |
| 668 | break; |
| 669 | case COBR: |
| 670 | case COJ: |
| 671 | cobr_fmt (args, oP->opcode | bp_bits, oP); |
| 672 | break; |
| 673 | case REG: |
| 674 | if (branch_predict) |
| 675 | { |
| 676 | as_warn (bp_error_msg); |
| 677 | } |
| 678 | reg_fmt (args, oP); |
| 679 | break; |
| 680 | case MEM1: |
| 681 | if (args[0][0] == 'c' && args[0][1] == 'a') |
| 682 | { |
| 683 | if (branch_predict) |
| 684 | { |
| 685 | as_warn (bp_error_msg); |
| 686 | } |
| 687 | mem_fmt (args, oP, 1); |
| 688 | break; |
| 689 | } |
| 690 | case MEM2: |
| 691 | case MEM4: |
| 692 | case MEM8: |
| 693 | case MEM12: |
| 694 | case MEM16: |
| 695 | if (branch_predict) |
| 696 | { |
| 697 | as_warn (bp_error_msg); |
| 698 | } |
| 699 | mem_fmt (args, oP, 0); |
| 700 | break; |
| 701 | case CALLJ: |
| 702 | if (branch_predict) |
| 703 | { |
| 704 | as_warn (bp_error_msg); |
| 705 | } |
| 706 | /* Output opcode & set up "fixup" (relocation); flag |
| 707 | relocation as 'callj' type. */ |
| 708 | know (oP->num_ops == 1); |
| 709 | get_cdisp (args[1], "CTRL", oP->opcode, 24, 0, 1); |
| 710 | break; |
| 711 | default: |
| 712 | BAD_CASE (oP->format); |
| 713 | break; |
| 714 | } |
| 715 | } |
| 716 | } /* md_assemble() */ |
| 717 | |
| 718 | /***************************************************************************** |
| 719 | md_number_to_chars: convert a number to target byte order |
| 720 | |
| 721 | *************************************************************************** */ |
| 722 | void |
| 723 | md_number_to_chars (buf, value, n) |
| 724 | char *buf; |
| 725 | valueT value; |
| 726 | int n; |
| 727 | { |
| 728 | number_to_chars_littleendian (buf, value, n); |
| 729 | } |
| 730 | |
| 731 | /***************************************************************************** |
| 732 | md_chars_to_number: convert from target byte order to host byte order. |
| 733 | |
| 734 | *************************************************************************** */ |
| 735 | static int md_chars_to_number PARAMS ((unsigned char *, int)); |
| 736 | |
| 737 | static int |
| 738 | md_chars_to_number (val, n) |
| 739 | unsigned char *val; /* Value in target byte order */ |
| 740 | int n; /* Number of bytes in the input */ |
| 741 | { |
| 742 | int retval; |
| 743 | |
| 744 | for (retval = 0; n--;) |
| 745 | { |
| 746 | retval <<= 8; |
| 747 | retval |= val[n]; |
| 748 | } |
| 749 | return retval; |
| 750 | } |
| 751 | |
| 752 | #define MAX_LITTLENUMS 6 |
| 753 | #define LNUM_SIZE sizeof (LITTLENUM_TYPE) |
| 754 | |
| 755 | /***************************************************************************** |
| 756 | md_atof: convert ascii to floating point |
| 757 | |
| 758 | Turn a string at input_line_pointer into a floating point constant of type |
| 759 | 'type', and store the appropriate bytes at *litP. The number of LITTLENUMS |
| 760 | emitted is returned at 'sizeP'. An error message is returned, or a pointer |
| 761 | to an empty message if OK. |
| 762 | |
| 763 | Note we call the i386 floating point routine, rather than complicating |
| 764 | things with more files or symbolic links. |
| 765 | |
| 766 | *************************************************************************** */ |
| 767 | char * |
| 768 | md_atof (type, litP, sizeP) |
| 769 | int type; |
| 770 | char *litP; |
| 771 | int *sizeP; |
| 772 | { |
| 773 | LITTLENUM_TYPE words[MAX_LITTLENUMS]; |
| 774 | LITTLENUM_TYPE *wordP; |
| 775 | int prec; |
| 776 | char *t; |
| 777 | |
| 778 | switch (type) |
| 779 | { |
| 780 | case 'f': |
| 781 | case 'F': |
| 782 | prec = 2; |
| 783 | break; |
| 784 | |
| 785 | case 'd': |
| 786 | case 'D': |
| 787 | prec = 4; |
| 788 | break; |
| 789 | |
| 790 | case 't': |
| 791 | case 'T': |
| 792 | prec = 5; |
| 793 | type = 'x'; /* That's what atof_ieee() understands */ |
| 794 | break; |
| 795 | |
| 796 | default: |
| 797 | *sizeP = 0; |
| 798 | return _("Bad call to md_atof()"); |
| 799 | } |
| 800 | |
| 801 | t = atof_ieee (input_line_pointer, type, words); |
| 802 | if (t) |
| 803 | { |
| 804 | input_line_pointer = t; |
| 805 | } |
| 806 | |
| 807 | *sizeP = prec * LNUM_SIZE; |
| 808 | |
| 809 | /* Output the LITTLENUMs in REVERSE order in accord with i80960 |
| 810 | word-order. (Dunno why atof_ieee doesn't do it in the right |
| 811 | order in the first place -- probably because it's a hack of |
| 812 | atof_m68k.) */ |
| 813 | |
| 814 | for (wordP = words + prec - 1; prec--;) |
| 815 | { |
| 816 | md_number_to_chars (litP, (long) (*wordP--), LNUM_SIZE); |
| 817 | litP += sizeof (LITTLENUM_TYPE); |
| 818 | } |
| 819 | |
| 820 | return 0; |
| 821 | } |
| 822 | |
| 823 | /***************************************************************************** |
| 824 | md_number_to_imm |
| 825 | |
| 826 | *************************************************************************** */ |
| 827 | static void md_number_to_imm PARAMS ((char *, long, int)); |
| 828 | |
| 829 | static void |
| 830 | md_number_to_imm (buf, val, n) |
| 831 | char *buf; |
| 832 | long val; |
| 833 | int n; |
| 834 | { |
| 835 | md_number_to_chars (buf, val, n); |
| 836 | } |
| 837 | |
| 838 | /***************************************************************************** |
| 839 | md_number_to_field: |
| 840 | |
| 841 | Stick a value (an address fixup) into a bit field of |
| 842 | previously-generated instruction. |
| 843 | |
| 844 | *************************************************************************** */ |
| 845 | static void md_number_to_field PARAMS ((char *, long, bit_fixS *)); |
| 846 | |
| 847 | static void |
| 848 | md_number_to_field (instrP, val, bfixP) |
| 849 | char *instrP; /* Pointer to instruction to be fixed */ |
| 850 | long val; /* Address fixup value */ |
| 851 | bit_fixS *bfixP; /* Description of bit field to be fixed up */ |
| 852 | { |
| 853 | int numbits; /* Length of bit field to be fixed */ |
| 854 | long instr; /* 32-bit instruction to be fixed-up */ |
| 855 | long sign; /* 0 or -1, according to sign bit of 'val' */ |
| 856 | |
| 857 | /* Convert instruction back to host byte order. */ |
| 858 | instr = md_chars_to_number (instrP, 4); |
| 859 | |
| 860 | /* Surprise! -- we stored the number of bits to be modified rather |
| 861 | than a pointer to a structure. */ |
| 862 | numbits = (int) bfixP; |
| 863 | if (numbits == 1) |
| 864 | { |
| 865 | /* This is a no-op, stuck here by reloc_callj() */ |
| 866 | return; |
| 867 | } |
| 868 | |
| 869 | know ((numbits == 13) || (numbits == 24)); |
| 870 | |
| 871 | /* Propagate sign bit of 'val' for the given number of bits. Result |
| 872 | should be all 0 or all 1. */ |
| 873 | sign = val >> ((int) numbits - 1); |
| 874 | if (((val < 0) && (sign != -1)) |
| 875 | || ((val > 0) && (sign != 0))) |
| 876 | { |
| 877 | as_bad (_("Fixup of %ld too large for field width of %d"), |
| 878 | val, numbits); |
| 879 | } |
| 880 | else |
| 881 | { |
| 882 | /* Put bit field into instruction and write back in target |
| 883 | * byte order. |
| 884 | */ |
| 885 | val &= ~(-1 << (int) numbits); /* Clear unused sign bits */ |
| 886 | instr |= val; |
| 887 | md_number_to_chars (instrP, instr, 4); |
| 888 | } |
| 889 | } /* md_number_to_field() */ |
| 890 | \f |
| 891 | |
| 892 | /***************************************************************************** |
| 893 | md_parse_option |
| 894 | Invocation line includes a switch not recognized by the base assembler. |
| 895 | See if it's a processor-specific option. For the 960, these are: |
| 896 | |
| 897 | -norelax: |
| 898 | Conditional branch instructions that require displacements |
| 899 | greater than 13 bits (or that have external targets) should |
| 900 | generate errors. The default is to replace each such |
| 901 | instruction with the corresponding compare (or chkbit) and |
| 902 | branch instructions. Note that the Intel "j" cobr directives |
| 903 | are ALWAYS "de-optimized" in this way when necessary, |
| 904 | regardless of the setting of this option. |
| 905 | |
| 906 | -b: |
| 907 | Add code to collect information about branches taken, for |
| 908 | later optimization of branch prediction bits by a separate |
| 909 | tool. COBR and CNTL format instructions have branch |
| 910 | prediction bits (in the CX architecture); if "BR" represents |
| 911 | an instruction in one of these classes, the following rep- |
| 912 | resents the code generated by the assembler: |
| 913 | |
| 914 | call <increment routine> |
| 915 | .word 0 # pre-counter |
| 916 | Label: BR |
| 917 | call <increment routine> |
| 918 | .word 0 # post-counter |
| 919 | |
| 920 | A table of all such "Labels" is also generated. |
| 921 | |
| 922 | -AKA, -AKB, -AKC, -ASA, -ASB, -AMC, -ACA: |
| 923 | Select the 80960 architecture. Instructions or features not |
| 924 | supported by the selected architecture cause fatal errors. |
| 925 | The default is to generate code for any instruction or feature |
| 926 | that is supported by SOME version of the 960 (even if this |
| 927 | means mixing architectures!). |
| 928 | |
| 929 | ****************************************************************************/ |
| 930 | |
| 931 | const char *md_shortopts = "A:b"; |
| 932 | struct option md_longopts[] = |
| 933 | { |
| 934 | #define OPTION_LINKRELAX (OPTION_MD_BASE) |
| 935 | {"linkrelax", no_argument, NULL, OPTION_LINKRELAX}, |
| 936 | {"link-relax", no_argument, NULL, OPTION_LINKRELAX}, |
| 937 | #define OPTION_NORELAX (OPTION_MD_BASE + 1) |
| 938 | {"norelax", no_argument, NULL, OPTION_NORELAX}, |
| 939 | {"no-relax", no_argument, NULL, OPTION_NORELAX}, |
| 940 | {NULL, no_argument, NULL, 0} |
| 941 | }; |
| 942 | size_t md_longopts_size = sizeof (md_longopts); |
| 943 | |
| 944 | struct tabentry |
| 945 | { |
| 946 | char *flag; |
| 947 | int arch; |
| 948 | }; |
| 949 | static const struct tabentry arch_tab[] = |
| 950 | { |
| 951 | {"KA", ARCH_KA}, |
| 952 | {"KB", ARCH_KB}, |
| 953 | {"SA", ARCH_KA}, /* Synonym for KA */ |
| 954 | {"SB", ARCH_KB}, /* Synonym for KB */ |
| 955 | {"KC", ARCH_MC}, /* Synonym for MC */ |
| 956 | {"MC", ARCH_MC}, |
| 957 | {"CA", ARCH_CA}, |
| 958 | {"JX", ARCH_JX}, |
| 959 | {"HX", ARCH_HX}, |
| 960 | {NULL, 0} |
| 961 | }; |
| 962 | |
| 963 | int |
| 964 | md_parse_option (c, arg) |
| 965 | int c; |
| 966 | char *arg; |
| 967 | { |
| 968 | switch (c) |
| 969 | { |
| 970 | case OPTION_LINKRELAX: |
| 971 | linkrelax = 1; |
| 972 | flag_keep_locals = 1; |
| 973 | break; |
| 974 | |
| 975 | case OPTION_NORELAX: |
| 976 | norelax = 1; |
| 977 | break; |
| 978 | |
| 979 | case 'b': |
| 980 | instrument_branches = 1; |
| 981 | break; |
| 982 | |
| 983 | case 'A': |
| 984 | { |
| 985 | const struct tabentry *tp; |
| 986 | char *p = arg; |
| 987 | |
| 988 | for (tp = arch_tab; tp->flag != NULL; tp++) |
| 989 | if (!strcmp (p, tp->flag)) |
| 990 | break; |
| 991 | |
| 992 | if (tp->flag == NULL) |
| 993 | { |
| 994 | as_bad (_("invalid architecture %s"), p); |
| 995 | return 0; |
| 996 | } |
| 997 | else |
| 998 | architecture = tp->arch; |
| 999 | } |
| 1000 | break; |
| 1001 | |
| 1002 | default: |
| 1003 | return 0; |
| 1004 | } |
| 1005 | |
| 1006 | return 1; |
| 1007 | } |
| 1008 | |
| 1009 | void |
| 1010 | md_show_usage (stream) |
| 1011 | FILE *stream; |
| 1012 | { |
| 1013 | int i; |
| 1014 | fprintf (stream, _("I960 options:\n")); |
| 1015 | for (i = 0; arch_tab[i].flag; i++) |
| 1016 | fprintf (stream, "%s-A%s", i ? " | " : "", arch_tab[i].flag); |
| 1017 | fprintf (stream, _("\n\ |
| 1018 | specify variant of 960 architecture\n\ |
| 1019 | -b add code to collect statistics about branches taken\n\ |
| 1020 | -link-relax preserve individual alignment directives so linker\n\ |
| 1021 | can do relaxing (b.out format only)\n\ |
| 1022 | -no-relax don't alter compare-and-branch instructions for\n\ |
| 1023 | long displacements\n")); |
| 1024 | } |
| 1025 | \f |
| 1026 | |
| 1027 | /***************************************************************************** |
| 1028 | md_convert_frag: |
| 1029 | Called by base assembler after address relaxation is finished: modify |
| 1030 | variable fragments according to how much relaxation was done. |
| 1031 | |
| 1032 | If the fragment substate is still 1, a 13-bit displacement was enough |
| 1033 | to reach the symbol in question. Set up an address fixup, but otherwise |
| 1034 | leave the cobr instruction alone. |
| 1035 | |
| 1036 | If the fragment substate is 2, a 13-bit displacement was not enough. |
| 1037 | Replace the cobr with a two instructions (a compare and a branch). |
| 1038 | |
| 1039 | *************************************************************************** */ |
| 1040 | #ifndef BFD_ASSEMBLER |
| 1041 | void |
| 1042 | md_convert_frag (headers, seg, fragP) |
| 1043 | object_headers *headers ATTRIBUTE_UNUSED; |
| 1044 | segT seg ATTRIBUTE_UNUSED; |
| 1045 | fragS *fragP; |
| 1046 | #else |
| 1047 | void |
| 1048 | md_convert_frag (abfd, sec, fragP) |
| 1049 | bfd *abfd ATTRIBUTE_UNUSED; |
| 1050 | segT sec ATTRIBUTE_UNUSED; |
| 1051 | fragS *fragP; |
| 1052 | #endif |
| 1053 | { |
| 1054 | fixS *fixP; /* Structure describing needed address fix */ |
| 1055 | |
| 1056 | switch (fragP->fr_subtype) |
| 1057 | { |
| 1058 | case 1: |
| 1059 | /* LEAVE SINGLE COBR INSTRUCTION */ |
| 1060 | fixP = fix_new (fragP, |
| 1061 | fragP->fr_opcode - fragP->fr_literal, |
| 1062 | 4, |
| 1063 | fragP->fr_symbol, |
| 1064 | fragP->fr_offset, |
| 1065 | 1, |
| 1066 | NO_RELOC); |
| 1067 | |
| 1068 | fixP->fx_bit_fixP = (bit_fixS *) 13; /* size of bit field */ |
| 1069 | break; |
| 1070 | case 2: |
| 1071 | /* REPLACE COBR WITH COMPARE/BRANCH INSTRUCTIONS */ |
| 1072 | relax_cobr (fragP); |
| 1073 | break; |
| 1074 | default: |
| 1075 | BAD_CASE (fragP->fr_subtype); |
| 1076 | break; |
| 1077 | } |
| 1078 | } |
| 1079 | |
| 1080 | /***************************************************************************** |
| 1081 | md_estimate_size_before_relax: How much does it look like *fragP will grow? |
| 1082 | |
| 1083 | Called by base assembler just before address relaxation. |
| 1084 | Return the amount by which the fragment will grow. |
| 1085 | |
| 1086 | Any symbol that is now undefined will not become defined; cobr's |
| 1087 | based on undefined symbols will have to be replaced with a compare |
| 1088 | instruction and a branch instruction, and the code fragment will grow |
| 1089 | by 4 bytes. |
| 1090 | |
| 1091 | *************************************************************************** */ |
| 1092 | int |
| 1093 | md_estimate_size_before_relax (fragP, segment_type) |
| 1094 | register fragS *fragP; |
| 1095 | register segT segment_type; |
| 1096 | { |
| 1097 | /* If symbol is undefined in this segment, go to "relaxed" state |
| 1098 | (compare and branch instructions instead of cobr) right now. */ |
| 1099 | if (S_GET_SEGMENT (fragP->fr_symbol) != segment_type) |
| 1100 | { |
| 1101 | relax_cobr (fragP); |
| 1102 | return 4; |
| 1103 | } |
| 1104 | |
| 1105 | return md_relax_table[fragP->fr_subtype].rlx_length; |
| 1106 | } /* md_estimate_size_before_relax() */ |
| 1107 | |
| 1108 | #if defined(OBJ_AOUT) | defined(OBJ_BOUT) |
| 1109 | |
| 1110 | /***************************************************************************** |
| 1111 | md_ri_to_chars: |
| 1112 | This routine exists in order to overcome machine byte-order problems |
| 1113 | when dealing with bit-field entries in the relocation_info struct. |
| 1114 | |
| 1115 | But relocation info will be used on the host machine only (only |
| 1116 | executable code is actually downloaded to the i80960). Therefore, |
| 1117 | we leave it in host byte order. |
| 1118 | |
| 1119 | The above comment is no longer true. This routine now really |
| 1120 | does do the reordering (Ian Taylor 28 Aug 92). |
| 1121 | |
| 1122 | *************************************************************************** */ |
| 1123 | static void md_ri_to_chars PARAMS ((char *, struct relocation_info *)); |
| 1124 | |
| 1125 | static void |
| 1126 | md_ri_to_chars (where, ri) |
| 1127 | char *where; |
| 1128 | struct relocation_info *ri; |
| 1129 | { |
| 1130 | md_number_to_chars (where, ri->r_address, |
| 1131 | sizeof (ri->r_address)); |
| 1132 | where[4] = ri->r_index & 0x0ff; |
| 1133 | where[5] = (ri->r_index >> 8) & 0x0ff; |
| 1134 | where[6] = (ri->r_index >> 16) & 0x0ff; |
| 1135 | where[7] = ((ri->r_pcrel << 0) |
| 1136 | | (ri->r_length << 1) |
| 1137 | | (ri->r_extern << 3) |
| 1138 | | (ri->r_bsr << 4) |
| 1139 | | (ri->r_disp << 5) |
| 1140 | | (ri->r_callj << 6)); |
| 1141 | } |
| 1142 | |
| 1143 | #endif /* defined(OBJ_AOUT) | defined(OBJ_BOUT) */ |
| 1144 | |
| 1145 | \f |
| 1146 | /* FOLLOWING ARE THE LOCAL ROUTINES, IN ALPHABETICAL ORDER */ |
| 1147 | |
| 1148 | /***************************************************************************** |
| 1149 | brcnt_emit: Emit code to increment inline branch counter. |
| 1150 | |
| 1151 | See the comments above the declaration of 'br_cnt' for details on |
| 1152 | branch-prediction instrumentation. |
| 1153 | *************************************************************************** */ |
| 1154 | static void |
| 1155 | brcnt_emit () |
| 1156 | { |
| 1157 | ctrl_fmt (BR_CNT_FUNC, CALL, 1); /* Emit call to "increment" routine */ |
| 1158 | emit (0); /* Emit inline counter to be incremented */ |
| 1159 | } |
| 1160 | |
| 1161 | /***************************************************************************** |
| 1162 | brlab_next: generate the next branch local label |
| 1163 | |
| 1164 | See the comments above the declaration of 'br_cnt' for details on |
| 1165 | branch-prediction instrumentation. |
| 1166 | *************************************************************************** */ |
| 1167 | static char * |
| 1168 | brlab_next () |
| 1169 | { |
| 1170 | static char buf[20]; |
| 1171 | |
| 1172 | sprintf (buf, "%s%d", BR_LABEL_BASE, br_cnt++); |
| 1173 | return buf; |
| 1174 | } |
| 1175 | |
| 1176 | /***************************************************************************** |
| 1177 | brtab_emit: generate the fetch-prediction branch table. |
| 1178 | |
| 1179 | See the comments above the declaration of 'br_cnt' for details on |
| 1180 | branch-prediction instrumentation. |
| 1181 | |
| 1182 | The code emitted here would be functionally equivalent to the following |
| 1183 | example assembler source. |
| 1184 | |
| 1185 | .data |
| 1186 | .align 2 |
| 1187 | BR_TAB_NAME: |
| 1188 | .word 0 # link to next table |
| 1189 | .word 3 # length of table |
| 1190 | .word LBRANCH0 # 1st entry in table proper |
| 1191 | .word LBRANCH1 |
| 1192 | .word LBRANCH2 |
| 1193 | **************************************************************************** */ |
| 1194 | void |
| 1195 | brtab_emit () |
| 1196 | { |
| 1197 | int i; |
| 1198 | char buf[20]; |
| 1199 | char *p; /* Where the binary was output to */ |
| 1200 | /* Pointer to description of deferred address fixup. */ |
| 1201 | fixS *fixP; |
| 1202 | |
| 1203 | if (!instrument_branches) |
| 1204 | { |
| 1205 | return; |
| 1206 | } |
| 1207 | |
| 1208 | subseg_set (data_section, 0); /* .data */ |
| 1209 | frag_align (2, 0, 0); /* .align 2 */ |
| 1210 | record_alignment (now_seg, 2); |
| 1211 | colon (BR_TAB_NAME); /* BR_TAB_NAME: */ |
| 1212 | emit (0); /* .word 0 #link to next table */ |
| 1213 | emit (br_cnt); /* .word n #length of table */ |
| 1214 | |
| 1215 | for (i = 0; i < br_cnt; i++) |
| 1216 | { |
| 1217 | sprintf (buf, "%s%d", BR_LABEL_BASE, i); |
| 1218 | p = emit (0); |
| 1219 | fixP = fix_new (frag_now, |
| 1220 | p - frag_now->fr_literal, |
| 1221 | 4, |
| 1222 | symbol_find (buf), |
| 1223 | 0, |
| 1224 | 0, |
| 1225 | NO_RELOC); |
| 1226 | } |
| 1227 | } |
| 1228 | |
| 1229 | /***************************************************************************** |
| 1230 | cobr_fmt: generate a COBR-format instruction |
| 1231 | |
| 1232 | *************************************************************************** */ |
| 1233 | static void |
| 1234 | cobr_fmt (arg, opcode, oP) |
| 1235 | /* arg[0]->opcode mnemonic, arg[1-3]->operands (ascii) */ |
| 1236 | char *arg[]; |
| 1237 | /* Opcode, with branch-prediction bits already set if necessary. */ |
| 1238 | long opcode; |
| 1239 | /* Pointer to description of instruction. */ |
| 1240 | struct i960_opcode *oP; |
| 1241 | { |
| 1242 | long instr; /* 32-bit instruction */ |
| 1243 | struct regop regop; /* Description of register operand */ |
| 1244 | int n; /* Number of operands */ |
| 1245 | int var_frag; /* 1 if varying length code fragment should |
| 1246 | * be emitted; 0 if an address fix |
| 1247 | * should be emitted. |
| 1248 | */ |
| 1249 | |
| 1250 | instr = opcode; |
| 1251 | n = oP->num_ops; |
| 1252 | |
| 1253 | if (n >= 1) |
| 1254 | { |
| 1255 | /* First operand (if any) of a COBR is always a register |
| 1256 | operand. Parse it. */ |
| 1257 | parse_regop (®op, arg[1], oP->operand[0]); |
| 1258 | instr |= (regop.n << 19) | (regop.mode << 13); |
| 1259 | } |
| 1260 | if (n >= 2) |
| 1261 | { |
| 1262 | /* Second operand (if any) of a COBR is always a register |
| 1263 | operand. Parse it. */ |
| 1264 | parse_regop (®op, arg[2], oP->operand[1]); |
| 1265 | instr |= (regop.n << 14) | regop.special; |
| 1266 | } |
| 1267 | |
| 1268 | if (n < 3) |
| 1269 | { |
| 1270 | emit (instr); |
| 1271 | |
| 1272 | } |
| 1273 | else |
| 1274 | { |
| 1275 | if (instrument_branches) |
| 1276 | { |
| 1277 | brcnt_emit (); |
| 1278 | colon (brlab_next ()); |
| 1279 | } |
| 1280 | |
| 1281 | /* A third operand to a COBR is always a displacement. Parse |
| 1282 | it; if it's relaxable (a cobr "j" directive, or any cobr |
| 1283 | other than bbs/bbc when the "-norelax" option is not in use) |
| 1284 | set up a variable code fragment; otherwise set up an address |
| 1285 | fix. */ |
| 1286 | var_frag = !norelax || (oP->format == COJ); /* TRUE or FALSE */ |
| 1287 | get_cdisp (arg[3], "COBR", instr, 13, var_frag, 0); |
| 1288 | |
| 1289 | if (instrument_branches) |
| 1290 | { |
| 1291 | brcnt_emit (); |
| 1292 | } |
| 1293 | } |
| 1294 | } /* cobr_fmt() */ |
| 1295 | |
| 1296 | /***************************************************************************** |
| 1297 | ctrl_fmt: generate a CTRL-format instruction |
| 1298 | |
| 1299 | *************************************************************************** */ |
| 1300 | static void |
| 1301 | ctrl_fmt (targP, opcode, num_ops) |
| 1302 | char *targP; /* Pointer to text of lone operand (if any) */ |
| 1303 | long opcode; /* Template of instruction */ |
| 1304 | int num_ops; /* Number of operands */ |
| 1305 | { |
| 1306 | int instrument; /* TRUE iff we should add instrumentation to track |
| 1307 | * how often the branch is taken |
| 1308 | */ |
| 1309 | |
| 1310 | if (num_ops == 0) |
| 1311 | { |
| 1312 | emit (opcode); /* Output opcode */ |
| 1313 | } |
| 1314 | else |
| 1315 | { |
| 1316 | |
| 1317 | instrument = instrument_branches && (opcode != CALL) |
| 1318 | && (opcode != B) && (opcode != RET) && (opcode != BAL); |
| 1319 | |
| 1320 | if (instrument) |
| 1321 | { |
| 1322 | brcnt_emit (); |
| 1323 | colon (brlab_next ()); |
| 1324 | } |
| 1325 | |
| 1326 | /* The operand MUST be an ip-relative displacment. Parse it |
| 1327 | * and set up address fix for the instruction we just output. |
| 1328 | */ |
| 1329 | get_cdisp (targP, "CTRL", opcode, 24, 0, 0); |
| 1330 | |
| 1331 | if (instrument) |
| 1332 | { |
| 1333 | brcnt_emit (); |
| 1334 | } |
| 1335 | } |
| 1336 | |
| 1337 | } |
| 1338 | |
| 1339 | /***************************************************************************** |
| 1340 | emit: output instruction binary |
| 1341 | |
| 1342 | Output instruction binary, in target byte order, 4 bytes at a time. |
| 1343 | Return pointer to where it was placed. |
| 1344 | |
| 1345 | *************************************************************************** */ |
| 1346 | static char * |
| 1347 | emit (instr) |
| 1348 | long instr; /* Word to be output, host byte order */ |
| 1349 | { |
| 1350 | char *toP; /* Where to output it */ |
| 1351 | |
| 1352 | toP = frag_more (4); /* Allocate storage */ |
| 1353 | md_number_to_chars (toP, instr, 4); /* Convert to target byte order */ |
| 1354 | return toP; |
| 1355 | } |
| 1356 | |
| 1357 | /***************************************************************************** |
| 1358 | get_args: break individual arguments out of comma-separated list |
| 1359 | |
| 1360 | Input assumptions: |
| 1361 | - all comments and labels have been removed |
| 1362 | - all strings of whitespace have been collapsed to a single blank. |
| 1363 | - all character constants ('x') have been replaced with decimal |
| 1364 | |
| 1365 | Output: |
| 1366 | args[0] is untouched. args[1] points to first operand, etc. All args: |
| 1367 | - are NULL-terminated |
| 1368 | - contain no whitespace |
| 1369 | |
| 1370 | Return value: |
| 1371 | Number of operands (0,1,2, or 3) or -1 on error. |
| 1372 | |
| 1373 | *************************************************************************** */ |
| 1374 | static int |
| 1375 | get_args (p, args) |
| 1376 | /* Pointer to comma-separated operands; MUCKED BY US */ |
| 1377 | register char *p; |
| 1378 | /* Output arg: pointers to operands placed in args[1-3]. MUST |
| 1379 | ACCOMMODATE 4 ENTRIES (args[0-3]). */ |
| 1380 | char *args[]; |
| 1381 | { |
| 1382 | register int n; /* Number of operands */ |
| 1383 | register char *to; |
| 1384 | |
| 1385 | /* Skip lead white space */ |
| 1386 | while (*p == ' ') |
| 1387 | { |
| 1388 | p++; |
| 1389 | } |
| 1390 | |
| 1391 | if (*p == '\0') |
| 1392 | { |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | n = 1; |
| 1397 | args[1] = p; |
| 1398 | |
| 1399 | /* Squeze blanks out by moving non-blanks toward start of string. |
| 1400 | * Isolate operands, whenever comma is found. |
| 1401 | */ |
| 1402 | to = p; |
| 1403 | while (*p != '\0') |
| 1404 | { |
| 1405 | |
| 1406 | if (*p == ' ' |
| 1407 | && (! ISALNUM (p[1]) |
| 1408 | || ! ISALNUM (p[-1]))) |
| 1409 | { |
| 1410 | p++; |
| 1411 | |
| 1412 | } |
| 1413 | else if (*p == ',') |
| 1414 | { |
| 1415 | |
| 1416 | /* Start of operand */ |
| 1417 | if (n == 3) |
| 1418 | { |
| 1419 | as_bad (_("too many operands")); |
| 1420 | return -1; |
| 1421 | } |
| 1422 | *to++ = '\0'; /* Terminate argument */ |
| 1423 | args[++n] = to; /* Start next argument */ |
| 1424 | p++; |
| 1425 | |
| 1426 | } |
| 1427 | else |
| 1428 | { |
| 1429 | *to++ = *p++; |
| 1430 | } |
| 1431 | } |
| 1432 | *to = '\0'; |
| 1433 | return n; |
| 1434 | } |
| 1435 | |
| 1436 | /***************************************************************************** |
| 1437 | get_cdisp: handle displacement for a COBR or CTRL instruction. |
| 1438 | |
| 1439 | Parse displacement for a COBR or CTRL instruction. |
| 1440 | |
| 1441 | If successful, output the instruction opcode and set up for it, |
| 1442 | depending on the arg 'var_frag', either: |
| 1443 | o an address fixup to be done when all symbol values are known, or |
| 1444 | o a varying length code fragment, with address fixup info. This |
| 1445 | will be done for cobr instructions that may have to be relaxed |
| 1446 | in to compare/branch instructions (8 bytes) if the final |
| 1447 | address displacement is greater than 13 bits. |
| 1448 | |
| 1449 | ****************************************************************************/ |
| 1450 | static void |
| 1451 | get_cdisp (dispP, ifmtP, instr, numbits, var_frag, callj) |
| 1452 | /* displacement as specified in source instruction */ |
| 1453 | char *dispP; |
| 1454 | /* "COBR" or "CTRL" (for use in error message) */ |
| 1455 | char *ifmtP; |
| 1456 | /* Instruction needing the displacement */ |
| 1457 | long instr; |
| 1458 | /* # bits of displacement (13 for COBR, 24 for CTRL) */ |
| 1459 | int numbits; |
| 1460 | /* 1 if varying length code fragment should be emitted; |
| 1461 | * 0 if an address fix should be emitted. |
| 1462 | */ |
| 1463 | int var_frag; |
| 1464 | /* 1 if callj relocation should be done; else 0 */ |
| 1465 | int callj; |
| 1466 | { |
| 1467 | expressionS e; /* Parsed expression */ |
| 1468 | fixS *fixP; /* Structure describing needed address fix */ |
| 1469 | char *outP; /* Where instruction binary is output to */ |
| 1470 | |
| 1471 | fixP = NULL; |
| 1472 | |
| 1473 | parse_expr (dispP, &e); |
| 1474 | switch (e.X_op) |
| 1475 | { |
| 1476 | case O_illegal: |
| 1477 | as_bad (_("expression syntax error")); |
| 1478 | |
| 1479 | case O_symbol: |
| 1480 | if (S_GET_SEGMENT (e.X_add_symbol) == now_seg |
| 1481 | || S_GET_SEGMENT (e.X_add_symbol) == undefined_section) |
| 1482 | { |
| 1483 | if (var_frag) |
| 1484 | { |
| 1485 | outP = frag_more (8); /* Allocate worst-case storage */ |
| 1486 | md_number_to_chars (outP, instr, 4); |
| 1487 | frag_variant (rs_machine_dependent, 4, 4, 1, |
| 1488 | adds (e), offs (e), outP); |
| 1489 | } |
| 1490 | else |
| 1491 | { |
| 1492 | /* Set up a new fix structure, so address can be updated |
| 1493 | * when all symbol values are known. |
| 1494 | */ |
| 1495 | outP = emit (instr); |
| 1496 | fixP = fix_new (frag_now, |
| 1497 | outP - frag_now->fr_literal, |
| 1498 | 4, |
| 1499 | adds (e), |
| 1500 | offs (e), |
| 1501 | 1, |
| 1502 | NO_RELOC); |
| 1503 | |
| 1504 | fixP->fx_tcbit = callj; |
| 1505 | |
| 1506 | /* We want to modify a bit field when the address is |
| 1507 | * known. But we don't need all the garbage in the |
| 1508 | * bit_fix structure. So we're going to lie and store |
| 1509 | * the number of bits affected instead of a pointer. |
| 1510 | */ |
| 1511 | fixP->fx_bit_fixP = (bit_fixS *) numbits; |
| 1512 | } |
| 1513 | } |
| 1514 | else |
| 1515 | as_bad (_("attempt to branch into different segment")); |
| 1516 | break; |
| 1517 | |
| 1518 | default: |
| 1519 | as_bad (_("target of %s instruction must be a label"), ifmtP); |
| 1520 | break; |
| 1521 | } |
| 1522 | } |
| 1523 | |
| 1524 | /***************************************************************************** |
| 1525 | get_ispec: parse a memory operand for an index specification |
| 1526 | |
| 1527 | Here, an "index specification" is taken to be anything surrounded |
| 1528 | by square brackets and NOT followed by anything else. |
| 1529 | |
| 1530 | If it's found, detach it from the input string, remove the surrounding |
| 1531 | square brackets, and return a pointer to it. Otherwise, return NULL. |
| 1532 | |
| 1533 | *************************************************************************** */ |
| 1534 | static char * |
| 1535 | get_ispec (textP) |
| 1536 | /* Pointer to memory operand from source instruction, no white space. */ |
| 1537 | char *textP; |
| 1538 | { |
| 1539 | /* Points to start of index specification. */ |
| 1540 | char *start; |
| 1541 | /* Points to end of index specification. */ |
| 1542 | char *end; |
| 1543 | |
| 1544 | /* Find opening square bracket, if any. */ |
| 1545 | start = strchr (textP, '['); |
| 1546 | |
| 1547 | if (start != NULL) |
| 1548 | { |
| 1549 | |
| 1550 | /* Eliminate '[', detach from rest of operand */ |
| 1551 | *start++ = '\0'; |
| 1552 | |
| 1553 | end = strchr (start, ']'); |
| 1554 | |
| 1555 | if (end == NULL) |
| 1556 | { |
| 1557 | as_bad (_("unmatched '['")); |
| 1558 | |
| 1559 | } |
| 1560 | else |
| 1561 | { |
| 1562 | /* Eliminate ']' and make sure it was the last thing |
| 1563 | * in the string. |
| 1564 | */ |
| 1565 | *end = '\0'; |
| 1566 | if (*(end + 1) != '\0') |
| 1567 | { |
| 1568 | as_bad (_("garbage after index spec ignored")); |
| 1569 | } |
| 1570 | } |
| 1571 | } |
| 1572 | return start; |
| 1573 | } |
| 1574 | |
| 1575 | /***************************************************************************** |
| 1576 | get_regnum: |
| 1577 | |
| 1578 | Look up a (suspected) register name in the register table and return the |
| 1579 | associated register number (or -1 if not found). |
| 1580 | |
| 1581 | *************************************************************************** */ |
| 1582 | static int |
| 1583 | get_regnum (regname) |
| 1584 | char *regname; /* Suspected register name */ |
| 1585 | { |
| 1586 | int *rP; |
| 1587 | |
| 1588 | rP = (int *) hash_find (reg_hash, regname); |
| 1589 | return (rP == NULL) ? -1 : *rP; |
| 1590 | } |
| 1591 | |
| 1592 | /***************************************************************************** |
| 1593 | i_scan: perform lexical scan of ascii assembler instruction. |
| 1594 | |
| 1595 | Input assumptions: |
| 1596 | - input string is an i80960 instruction (not a pseudo-op) |
| 1597 | - all comments and labels have been removed |
| 1598 | - all strings of whitespace have been collapsed to a single blank. |
| 1599 | |
| 1600 | Output: |
| 1601 | args[0] points to opcode, other entries point to operands. All strings: |
| 1602 | - are NULL-terminated |
| 1603 | - contain no whitespace |
| 1604 | - have character constants ('x') replaced with a decimal number |
| 1605 | |
| 1606 | Return value: |
| 1607 | Number of operands (0,1,2, or 3) or -1 on error. |
| 1608 | |
| 1609 | *************************************************************************** */ |
| 1610 | static int |
| 1611 | i_scan (iP, args) |
| 1612 | /* Pointer to ascii instruction; MUCKED BY US. */ |
| 1613 | register char *iP; |
| 1614 | /* Output arg: pointers to opcode and operands placed here. MUST |
| 1615 | ACCOMMODATE 4 ENTRIES. */ |
| 1616 | char *args[]; |
| 1617 | { |
| 1618 | |
| 1619 | /* Isolate opcode */ |
| 1620 | if (*(iP) == ' ') |
| 1621 | { |
| 1622 | iP++; |
| 1623 | } /* Skip lead space, if any */ |
| 1624 | args[0] = iP; |
| 1625 | for (; *iP != ' '; iP++) |
| 1626 | { |
| 1627 | if (*iP == '\0') |
| 1628 | { |
| 1629 | /* There are no operands */ |
| 1630 | if (args[0] == iP) |
| 1631 | { |
| 1632 | /* We never moved: there was no opcode either! */ |
| 1633 | as_bad (_("missing opcode")); |
| 1634 | return -1; |
| 1635 | } |
| 1636 | return 0; |
| 1637 | } |
| 1638 | } |
| 1639 | *iP++ = '\0'; /* Terminate opcode */ |
| 1640 | return (get_args (iP, args)); |
| 1641 | } /* i_scan() */ |
| 1642 | |
| 1643 | /***************************************************************************** |
| 1644 | mem_fmt: generate a MEMA- or MEMB-format instruction |
| 1645 | |
| 1646 | *************************************************************************** */ |
| 1647 | static void |
| 1648 | mem_fmt (args, oP, callx) |
| 1649 | char *args[]; /* args[0]->opcode mnemonic, args[1-3]->operands */ |
| 1650 | struct i960_opcode *oP; /* Pointer to description of instruction */ |
| 1651 | int callx; /* Is this a callx opcode */ |
| 1652 | { |
| 1653 | int i; /* Loop counter */ |
| 1654 | struct regop regop; /* Description of register operand */ |
| 1655 | char opdesc; /* Operand descriptor byte */ |
| 1656 | memS instr; /* Description of binary to be output */ |
| 1657 | char *outP; /* Where the binary was output to */ |
| 1658 | expressionS expr; /* Parsed expression */ |
| 1659 | /* ->description of deferred address fixup */ |
| 1660 | fixS *fixP; |
| 1661 | |
| 1662 | #ifdef OBJ_COFF |
| 1663 | /* COFF support isn't in place yet for callx relaxing. */ |
| 1664 | callx = 0; |
| 1665 | #endif |
| 1666 | |
| 1667 | memset (&instr, '\0', sizeof (memS)); |
| 1668 | instr.opcode = oP->opcode; |
| 1669 | |
| 1670 | /* Process operands. */ |
| 1671 | for (i = 1; i <= oP->num_ops; i++) |
| 1672 | { |
| 1673 | opdesc = oP->operand[i - 1]; |
| 1674 | |
| 1675 | if (MEMOP (opdesc)) |
| 1676 | { |
| 1677 | parse_memop (&instr, args[i], oP->format); |
| 1678 | } |
| 1679 | else |
| 1680 | { |
| 1681 | parse_regop (®op, args[i], opdesc); |
| 1682 | instr.opcode |= regop.n << 19; |
| 1683 | } |
| 1684 | } |
| 1685 | |
| 1686 | /* Parse the displacement; this must be done before emitting the |
| 1687 | opcode, in case it is an expression using `.'. */ |
| 1688 | parse_expr (instr.e, &expr); |
| 1689 | |
| 1690 | /* Output opcode */ |
| 1691 | outP = emit (instr.opcode); |
| 1692 | |
| 1693 | if (instr.disp == 0) |
| 1694 | { |
| 1695 | return; |
| 1696 | } |
| 1697 | |
| 1698 | /* Process the displacement */ |
| 1699 | switch (expr.X_op) |
| 1700 | { |
| 1701 | case O_illegal: |
| 1702 | as_bad (_("expression syntax error")); |
| 1703 | break; |
| 1704 | |
| 1705 | case O_constant: |
| 1706 | if (instr.disp == 32) |
| 1707 | { |
| 1708 | (void) emit (offs (expr)); /* Output displacement */ |
| 1709 | } |
| 1710 | else |
| 1711 | { |
| 1712 | /* 12-bit displacement */ |
| 1713 | if (offs (expr) & ~0xfff) |
| 1714 | { |
| 1715 | /* Won't fit in 12 bits: convert already-output |
| 1716 | * instruction to MEMB format, output |
| 1717 | * displacement. |
| 1718 | */ |
| 1719 | mema_to_memb (outP); |
| 1720 | (void) emit (offs (expr)); |
| 1721 | } |
| 1722 | else |
| 1723 | { |
| 1724 | /* WILL fit in 12 bits: OR into opcode and |
| 1725 | * overwrite the binary we already put out |
| 1726 | */ |
| 1727 | instr.opcode |= offs (expr); |
| 1728 | md_number_to_chars (outP, instr.opcode, 4); |
| 1729 | } |
| 1730 | } |
| 1731 | break; |
| 1732 | |
| 1733 | default: |
| 1734 | if (instr.disp == 12) |
| 1735 | { |
| 1736 | /* Displacement is dependent on a symbol, whose value |
| 1737 | * may change at link time. We HAVE to reserve 32 bits. |
| 1738 | * Convert already-output opcode to MEMB format. |
| 1739 | */ |
| 1740 | mema_to_memb (outP); |
| 1741 | } |
| 1742 | |
| 1743 | /* Output 0 displacement and set up address fixup for when |
| 1744 | * this symbol's value becomes known. |
| 1745 | */ |
| 1746 | outP = emit ((long) 0); |
| 1747 | fixP = fix_new_exp (frag_now, |
| 1748 | outP - frag_now->fr_literal, |
| 1749 | 4, |
| 1750 | &expr, |
| 1751 | 0, |
| 1752 | NO_RELOC); |
| 1753 | /* Steve's linker relaxing hack. Mark this 32-bit relocation as |
| 1754 | being in the instruction stream, specifically as part of a callx |
| 1755 | instruction. */ |
| 1756 | fixP->fx_bsr = callx; |
| 1757 | break; |
| 1758 | } |
| 1759 | } /* memfmt() */ |
| 1760 | |
| 1761 | /***************************************************************************** |
| 1762 | mema_to_memb: convert a MEMA-format opcode to a MEMB-format opcode. |
| 1763 | |
| 1764 | There are 2 possible MEMA formats: |
| 1765 | - displacement only |
| 1766 | - displacement + abase |
| 1767 | |
| 1768 | They are distinguished by the setting of the MEMA_ABASE bit. |
| 1769 | |
| 1770 | *************************************************************************** */ |
| 1771 | static void |
| 1772 | mema_to_memb (opcodeP) |
| 1773 | char *opcodeP; /* Where to find the opcode, in target byte order */ |
| 1774 | { |
| 1775 | long opcode; /* Opcode in host byte order */ |
| 1776 | long mode; /* Mode bits for MEMB instruction */ |
| 1777 | |
| 1778 | opcode = md_chars_to_number (opcodeP, 4); |
| 1779 | know (!(opcode & MEMB_BIT)); |
| 1780 | |
| 1781 | mode = MEMB_BIT | D_BIT; |
| 1782 | if (opcode & MEMA_ABASE) |
| 1783 | { |
| 1784 | mode |= A_BIT; |
| 1785 | } |
| 1786 | |
| 1787 | opcode &= 0xffffc000; /* Clear MEMA offset and mode bits */ |
| 1788 | opcode |= mode; /* Set MEMB mode bits */ |
| 1789 | |
| 1790 | md_number_to_chars (opcodeP, opcode, 4); |
| 1791 | } /* mema_to_memb() */ |
| 1792 | |
| 1793 | /***************************************************************************** |
| 1794 | parse_expr: parse an expression |
| 1795 | |
| 1796 | Use base assembler's expression parser to parse an expression. |
| 1797 | It, unfortunately, runs off a global which we have to save/restore |
| 1798 | in order to make it work for us. |
| 1799 | |
| 1800 | An empty expression string is treated as an absolute 0. |
| 1801 | |
| 1802 | Sets O_illegal regardless of expression evaluation if entire input |
| 1803 | string is not consumed in the evaluation -- tolerate no dangling junk! |
| 1804 | |
| 1805 | *************************************************************************** */ |
| 1806 | static void |
| 1807 | parse_expr (textP, expP) |
| 1808 | char *textP; /* Text of expression to be parsed */ |
| 1809 | expressionS *expP; /* Where to put the results of parsing */ |
| 1810 | { |
| 1811 | char *save_in; /* Save global here */ |
| 1812 | symbolS *symP; |
| 1813 | |
| 1814 | know (textP); |
| 1815 | |
| 1816 | if (*textP == '\0') |
| 1817 | { |
| 1818 | /* Treat empty string as absolute 0 */ |
| 1819 | expP->X_add_symbol = expP->X_op_symbol = NULL; |
| 1820 | expP->X_add_number = 0; |
| 1821 | expP->X_op = O_constant; |
| 1822 | } |
| 1823 | else |
| 1824 | { |
| 1825 | save_in = input_line_pointer; /* Save global */ |
| 1826 | input_line_pointer = textP; /* Make parser work for us */ |
| 1827 | |
| 1828 | (void) expression (expP); |
| 1829 | if ((size_t) (input_line_pointer - textP) != strlen (textP)) |
| 1830 | { |
| 1831 | /* Did not consume all of the input */ |
| 1832 | expP->X_op = O_illegal; |
| 1833 | } |
| 1834 | symP = expP->X_add_symbol; |
| 1835 | if (symP && (hash_find (reg_hash, S_GET_NAME (symP)))) |
| 1836 | { |
| 1837 | /* Register name in an expression */ |
| 1838 | /* FIXME: this isn't much of a check any more. */ |
| 1839 | expP->X_op = O_illegal; |
| 1840 | } |
| 1841 | |
| 1842 | input_line_pointer = save_in; /* Restore global */ |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | /***************************************************************************** |
| 1847 | parse_ldcont: |
| 1848 | Parse and replace a 'ldconst' pseudo-instruction with an appropriate |
| 1849 | i80960 instruction. |
| 1850 | |
| 1851 | Assumes the input consists of: |
| 1852 | arg[0] opcode mnemonic ('ldconst') |
| 1853 | arg[1] first operand (constant) |
| 1854 | arg[2] name of register to be loaded |
| 1855 | |
| 1856 | Replaces opcode and/or operands as appropriate. |
| 1857 | |
| 1858 | Returns the new number of arguments, or -1 on failure. |
| 1859 | |
| 1860 | *************************************************************************** */ |
| 1861 | static int |
| 1862 | parse_ldconst (arg) |
| 1863 | char *arg[]; /* See above */ |
| 1864 | { |
| 1865 | int n; /* Constant to be loaded */ |
| 1866 | int shift; /* Shift count for "shlo" instruction */ |
| 1867 | static char buf[5]; /* Literal for first operand */ |
| 1868 | static char buf2[5]; /* Literal for second operand */ |
| 1869 | expressionS e; /* Parsed expression */ |
| 1870 | |
| 1871 | arg[3] = NULL; /* So we can tell at the end if it got used or not */ |
| 1872 | |
| 1873 | parse_expr (arg[1], &e); |
| 1874 | switch (e.X_op) |
| 1875 | { |
| 1876 | default: |
| 1877 | /* We're dependent on one or more symbols -- use "lda" */ |
| 1878 | arg[0] = "lda"; |
| 1879 | break; |
| 1880 | |
| 1881 | case O_constant: |
| 1882 | /* Try the following mappings: |
| 1883 | * ldconst 0,<reg> ->mov 0,<reg> |
| 1884 | * ldconst 31,<reg> ->mov 31,<reg> |
| 1885 | * ldconst 32,<reg> ->addo 1,31,<reg> |
| 1886 | * ldconst 62,<reg> ->addo 31,31,<reg> |
| 1887 | * ldconst 64,<reg> ->shlo 8,3,<reg> |
| 1888 | * ldconst -1,<reg> ->subo 1,0,<reg> |
| 1889 | * ldconst -31,<reg>->subo 31,0,<reg> |
| 1890 | * |
| 1891 | * anthing else becomes: |
| 1892 | * lda xxx,<reg> |
| 1893 | */ |
| 1894 | n = offs (e); |
| 1895 | if ((0 <= n) && (n <= 31)) |
| 1896 | { |
| 1897 | arg[0] = "mov"; |
| 1898 | |
| 1899 | } |
| 1900 | else if ((-31 <= n) && (n <= -1)) |
| 1901 | { |
| 1902 | arg[0] = "subo"; |
| 1903 | arg[3] = arg[2]; |
| 1904 | sprintf (buf, "%d", -n); |
| 1905 | arg[1] = buf; |
| 1906 | arg[2] = "0"; |
| 1907 | |
| 1908 | } |
| 1909 | else if ((32 <= n) && (n <= 62)) |
| 1910 | { |
| 1911 | arg[0] = "addo"; |
| 1912 | arg[3] = arg[2]; |
| 1913 | arg[1] = "31"; |
| 1914 | sprintf (buf, "%d", n - 31); |
| 1915 | arg[2] = buf; |
| 1916 | |
| 1917 | } |
| 1918 | else if ((shift = shift_ok (n)) != 0) |
| 1919 | { |
| 1920 | arg[0] = "shlo"; |
| 1921 | arg[3] = arg[2]; |
| 1922 | sprintf (buf, "%d", shift); |
| 1923 | arg[1] = buf; |
| 1924 | sprintf (buf2, "%d", n >> shift); |
| 1925 | arg[2] = buf2; |
| 1926 | |
| 1927 | } |
| 1928 | else |
| 1929 | { |
| 1930 | arg[0] = "lda"; |
| 1931 | } |
| 1932 | break; |
| 1933 | |
| 1934 | case O_illegal: |
| 1935 | as_bad (_("invalid constant")); |
| 1936 | return -1; |
| 1937 | break; |
| 1938 | } |
| 1939 | return (arg[3] == 0) ? 2 : 3; |
| 1940 | } |
| 1941 | |
| 1942 | /***************************************************************************** |
| 1943 | parse_memop: parse a memory operand |
| 1944 | |
| 1945 | This routine is based on the observation that the 4 mode bits of the |
| 1946 | MEMB format, taken individually, have fairly consistent meaning: |
| 1947 | |
| 1948 | M3 (bit 13): 1 if displacement is present (D_BIT) |
| 1949 | M2 (bit 12): 1 for MEMB instructions (MEMB_BIT) |
| 1950 | M1 (bit 11): 1 if index is present (I_BIT) |
| 1951 | M0 (bit 10): 1 if abase is present (A_BIT) |
| 1952 | |
| 1953 | So we parse the memory operand and set bits in the mode as we find |
| 1954 | things. Then at the end, if we go to MEMB format, we need only set |
| 1955 | the MEMB bit (M2) and our mode is built for us. |
| 1956 | |
| 1957 | Unfortunately, I said "fairly consistent". The exceptions: |
| 1958 | |
| 1959 | DBIA |
| 1960 | 0100 Would seem illegal, but means "abase-only". |
| 1961 | |
| 1962 | 0101 Would seem to mean "abase-only" -- it means IP-relative. |
| 1963 | Must be converted to 0100. |
| 1964 | |
| 1965 | 0110 Would seem to mean "index-only", but is reserved. |
| 1966 | We turn on the D bit and provide a 0 displacement. |
| 1967 | |
| 1968 | The other thing to observe is that we parse from the right, peeling |
| 1969 | things * off as we go: first any index spec, then any abase, then |
| 1970 | the displacement. |
| 1971 | |
| 1972 | *************************************************************************** */ |
| 1973 | static void |
| 1974 | parse_memop (memP, argP, optype) |
| 1975 | memS *memP; /* Where to put the results */ |
| 1976 | char *argP; /* Text of the operand to be parsed */ |
| 1977 | int optype; /* MEM1, MEM2, MEM4, MEM8, MEM12, or MEM16 */ |
| 1978 | { |
| 1979 | char *indexP; /* Pointer to index specification with "[]" removed */ |
| 1980 | char *p; /* Temp char pointer */ |
| 1981 | char iprel_flag; /* True if this is an IP-relative operand */ |
| 1982 | int regnum; /* Register number */ |
| 1983 | /* Scale factor: 1,2,4,8, or 16. Later converted to internal format |
| 1984 | (0,1,2,3,4 respectively). */ |
| 1985 | int scale; |
| 1986 | int mode; /* MEMB mode bits */ |
| 1987 | int *intP; /* Pointer to register number */ |
| 1988 | |
| 1989 | /* The following table contains the default scale factors for each |
| 1990 | type of memory instruction. It is accessed using (optype-MEM1) |
| 1991 | as an index -- thus it assumes the 'optype' constants are |
| 1992 | assigned consecutive values, in the order they appear in this |
| 1993 | table. */ |
| 1994 | static const int def_scale[] = |
| 1995 | { |
| 1996 | 1, /* MEM1 */ |
| 1997 | 2, /* MEM2 */ |
| 1998 | 4, /* MEM4 */ |
| 1999 | 8, /* MEM8 */ |
| 2000 | -1, /* MEM12 -- no valid default */ |
| 2001 | 16 /* MEM16 */ |
| 2002 | }; |
| 2003 | |
| 2004 | iprel_flag = mode = 0; |
| 2005 | |
| 2006 | /* Any index present? */ |
| 2007 | indexP = get_ispec (argP); |
| 2008 | if (indexP) |
| 2009 | { |
| 2010 | p = strchr (indexP, '*'); |
| 2011 | if (p == NULL) |
| 2012 | { |
| 2013 | /* No explicit scale -- use default for this instruction |
| 2014 | type and assembler mode. */ |
| 2015 | if (flag_mri) |
| 2016 | scale = 1; |
| 2017 | else |
| 2018 | /* GNU960 compatibility */ |
| 2019 | scale = def_scale[optype - MEM1]; |
| 2020 | } |
| 2021 | else |
| 2022 | { |
| 2023 | *p++ = '\0'; /* Eliminate '*' */ |
| 2024 | |
| 2025 | /* Now indexP->a '\0'-terminated register name, |
| 2026 | * and p->a scale factor. |
| 2027 | */ |
| 2028 | |
| 2029 | if (!strcmp (p, "16")) |
| 2030 | { |
| 2031 | scale = 16; |
| 2032 | } |
| 2033 | else if (strchr ("1248", *p) && (p[1] == '\0')) |
| 2034 | { |
| 2035 | scale = *p - '0'; |
| 2036 | } |
| 2037 | else |
| 2038 | { |
| 2039 | scale = -1; |
| 2040 | } |
| 2041 | } |
| 2042 | |
| 2043 | regnum = get_regnum (indexP); /* Get index reg. # */ |
| 2044 | if (!IS_RG_REG (regnum)) |
| 2045 | { |
| 2046 | as_bad (_("invalid index register")); |
| 2047 | return; |
| 2048 | } |
| 2049 | |
| 2050 | /* Convert scale to its binary encoding */ |
| 2051 | switch (scale) |
| 2052 | { |
| 2053 | case 1: |
| 2054 | scale = 0 << 7; |
| 2055 | break; |
| 2056 | case 2: |
| 2057 | scale = 1 << 7; |
| 2058 | break; |
| 2059 | case 4: |
| 2060 | scale = 2 << 7; |
| 2061 | break; |
| 2062 | case 8: |
| 2063 | scale = 3 << 7; |
| 2064 | break; |
| 2065 | case 16: |
| 2066 | scale = 4 << 7; |
| 2067 | break; |
| 2068 | default: |
| 2069 | as_bad (_("invalid scale factor")); |
| 2070 | return; |
| 2071 | }; |
| 2072 | |
| 2073 | memP->opcode |= scale | regnum; /* Set index bits in opcode */ |
| 2074 | mode |= I_BIT; /* Found a valid index spec */ |
| 2075 | } |
| 2076 | |
| 2077 | /* Any abase (Register Indirect) specification present? */ |
| 2078 | if ((p = strrchr (argP, '(')) != NULL) |
| 2079 | { |
| 2080 | /* "(" is there -- does it start a legal abase spec? If not, it |
| 2081 | could be part of a displacement expression. */ |
| 2082 | intP = (int *) hash_find (areg_hash, p); |
| 2083 | if (intP != NULL) |
| 2084 | { |
| 2085 | /* Got an abase here */ |
| 2086 | regnum = *intP; |
| 2087 | *p = '\0'; /* discard register spec */ |
| 2088 | if (regnum == IPREL) |
| 2089 | { |
| 2090 | /* We have to specialcase ip-rel mode */ |
| 2091 | iprel_flag = 1; |
| 2092 | } |
| 2093 | else |
| 2094 | { |
| 2095 | memP->opcode |= regnum << 14; |
| 2096 | mode |= A_BIT; |
| 2097 | } |
| 2098 | } |
| 2099 | } |
| 2100 | |
| 2101 | /* Any expression present? */ |
| 2102 | memP->e = argP; |
| 2103 | if (*argP != '\0') |
| 2104 | { |
| 2105 | mode |= D_BIT; |
| 2106 | } |
| 2107 | |
| 2108 | /* Special-case ip-relative addressing */ |
| 2109 | if (iprel_flag) |
| 2110 | { |
| 2111 | if (mode & I_BIT) |
| 2112 | { |
| 2113 | syntax (); |
| 2114 | } |
| 2115 | else |
| 2116 | { |
| 2117 | memP->opcode |= 5 << 10; /* IP-relative mode */ |
| 2118 | memP->disp = 32; |
| 2119 | } |
| 2120 | return; |
| 2121 | } |
| 2122 | |
| 2123 | /* Handle all other modes */ |
| 2124 | switch (mode) |
| 2125 | { |
| 2126 | case D_BIT | A_BIT: |
| 2127 | /* Go with MEMA instruction format for now (grow to MEMB later |
| 2128 | if 12 bits is not enough for the displacement). MEMA format |
| 2129 | has a single mode bit: set it to indicate that abase is |
| 2130 | present. */ |
| 2131 | memP->opcode |= MEMA_ABASE; |
| 2132 | memP->disp = 12; |
| 2133 | break; |
| 2134 | |
| 2135 | case D_BIT: |
| 2136 | /* Go with MEMA instruction format for now (grow to MEMB later |
| 2137 | if 12 bits is not enough for the displacement). */ |
| 2138 | memP->disp = 12; |
| 2139 | break; |
| 2140 | |
| 2141 | case A_BIT: |
| 2142 | /* For some reason, the bit string for this mode is not |
| 2143 | consistent: it should be 0 (exclusive of the MEMB bit), so we |
| 2144 | set it "by hand" here. */ |
| 2145 | memP->opcode |= MEMB_BIT; |
| 2146 | break; |
| 2147 | |
| 2148 | case A_BIT | I_BIT: |
| 2149 | /* set MEMB bit in mode, and OR in mode bits */ |
| 2150 | memP->opcode |= mode | MEMB_BIT; |
| 2151 | break; |
| 2152 | |
| 2153 | case I_BIT: |
| 2154 | /* Treat missing displacement as displacement of 0. */ |
| 2155 | mode |= D_BIT; |
| 2156 | /* Fall into next case. */ |
| 2157 | case D_BIT | A_BIT | I_BIT: |
| 2158 | case D_BIT | I_BIT: |
| 2159 | /* set MEMB bit in mode, and OR in mode bits */ |
| 2160 | memP->opcode |= mode | MEMB_BIT; |
| 2161 | memP->disp = 32; |
| 2162 | break; |
| 2163 | |
| 2164 | default: |
| 2165 | syntax (); |
| 2166 | break; |
| 2167 | } |
| 2168 | } |
| 2169 | |
| 2170 | /***************************************************************************** |
| 2171 | parse_po: parse machine-dependent pseudo-op |
| 2172 | |
| 2173 | This is a top-level routine for machine-dependent pseudo-ops. It slurps |
| 2174 | up the rest of the input line, breaks out the individual arguments, |
| 2175 | and dispatches them to the correct handler. |
| 2176 | *************************************************************************** */ |
| 2177 | static void |
| 2178 | parse_po (po_num) |
| 2179 | int po_num; /* Pseudo-op number: currently S_LEAFPROC or S_SYSPROC */ |
| 2180 | { |
| 2181 | /* Pointers operands, with no embedded whitespace. |
| 2182 | arg[0] unused, arg[1-3]->operands */ |
| 2183 | char *args[4]; |
| 2184 | int n_ops; /* Number of operands */ |
| 2185 | char *p; /* Pointer to beginning of unparsed argument string */ |
| 2186 | char eol; /* Character that indicated end of line */ |
| 2187 | |
| 2188 | extern char is_end_of_line[]; |
| 2189 | |
| 2190 | /* Advance input pointer to end of line. */ |
| 2191 | p = input_line_pointer; |
| 2192 | while (!is_end_of_line[(unsigned char) *input_line_pointer]) |
| 2193 | { |
| 2194 | input_line_pointer++; |
| 2195 | } |
| 2196 | eol = *input_line_pointer; /* Save end-of-line char */ |
| 2197 | *input_line_pointer = '\0'; /* Terminate argument list */ |
| 2198 | |
| 2199 | /* Parse out operands */ |
| 2200 | n_ops = get_args (p, args); |
| 2201 | if (n_ops == -1) |
| 2202 | { |
| 2203 | return; |
| 2204 | } |
| 2205 | |
| 2206 | /* Dispatch to correct handler */ |
| 2207 | switch (po_num) |
| 2208 | { |
| 2209 | case S_SYSPROC: |
| 2210 | s_sysproc (n_ops, args); |
| 2211 | break; |
| 2212 | case S_LEAFPROC: |
| 2213 | s_leafproc (n_ops, args); |
| 2214 | break; |
| 2215 | default: |
| 2216 | BAD_CASE (po_num); |
| 2217 | break; |
| 2218 | } |
| 2219 | |
| 2220 | /* Restore eol, so line numbers get updated correctly. Base |
| 2221 | assembler assumes we leave input pointer pointing at char |
| 2222 | following the eol. */ |
| 2223 | *input_line_pointer++ = eol; |
| 2224 | } |
| 2225 | |
| 2226 | /***************************************************************************** |
| 2227 | parse_regop: parse a register operand. |
| 2228 | |
| 2229 | In case of illegal operand, issue a message and return some valid |
| 2230 | information so instruction processing can continue. |
| 2231 | *************************************************************************** */ |
| 2232 | static void |
| 2233 | parse_regop (regopP, optext, opdesc) |
| 2234 | struct regop *regopP; /* Where to put description of register operand */ |
| 2235 | char *optext; /* Text of operand */ |
| 2236 | char opdesc; /* Descriptor byte: what's legal for this operand */ |
| 2237 | { |
| 2238 | int n; /* Register number */ |
| 2239 | expressionS e; /* Parsed expression */ |
| 2240 | |
| 2241 | /* See if operand is a register */ |
| 2242 | n = get_regnum (optext); |
| 2243 | if (n >= 0) |
| 2244 | { |
| 2245 | if (IS_RG_REG (n)) |
| 2246 | { |
| 2247 | /* global or local register */ |
| 2248 | if (!REG_ALIGN (opdesc, n)) |
| 2249 | { |
| 2250 | as_bad (_("unaligned register")); |
| 2251 | } |
| 2252 | regopP->n = n; |
| 2253 | regopP->mode = 0; |
| 2254 | regopP->special = 0; |
| 2255 | return; |
| 2256 | } |
| 2257 | else if (IS_FP_REG (n) && FP_OK (opdesc)) |
| 2258 | { |
| 2259 | /* Floating point register, and it's allowed */ |
| 2260 | regopP->n = n - FP0; |
| 2261 | regopP->mode = 1; |
| 2262 | regopP->special = 0; |
| 2263 | return; |
| 2264 | } |
| 2265 | else if (IS_SF_REG (n) && SFR_OK (opdesc)) |
| 2266 | { |
| 2267 | /* Special-function register, and it's allowed */ |
| 2268 | regopP->n = n - SF0; |
| 2269 | regopP->mode = 0; |
| 2270 | regopP->special = 1; |
| 2271 | if (!targ_has_sfr (regopP->n)) |
| 2272 | { |
| 2273 | as_bad (_("no such sfr in this architecture")); |
| 2274 | } |
| 2275 | return; |
| 2276 | } |
| 2277 | } |
| 2278 | else if (LIT_OK (opdesc)) |
| 2279 | { |
| 2280 | /* How about a literal? */ |
| 2281 | regopP->mode = 1; |
| 2282 | regopP->special = 0; |
| 2283 | if (FP_OK (opdesc)) |
| 2284 | { /* floating point literal acceptable */ |
| 2285 | /* Skip over 0f, 0d, or 0e prefix */ |
| 2286 | if ((optext[0] == '0') |
| 2287 | && (optext[1] >= 'd') |
| 2288 | && (optext[1] <= 'f')) |
| 2289 | { |
| 2290 | optext += 2; |
| 2291 | } |
| 2292 | |
| 2293 | if (!strcmp (optext, "0.0") || !strcmp (optext, "0")) |
| 2294 | { |
| 2295 | regopP->n = 0x10; |
| 2296 | return; |
| 2297 | } |
| 2298 | if (!strcmp (optext, "1.0") || !strcmp (optext, "1")) |
| 2299 | { |
| 2300 | regopP->n = 0x16; |
| 2301 | return; |
| 2302 | } |
| 2303 | |
| 2304 | } |
| 2305 | else |
| 2306 | { /* fixed point literal acceptable */ |
| 2307 | parse_expr (optext, &e); |
| 2308 | if (e.X_op != O_constant |
| 2309 | || (offs (e) < 0) || (offs (e) > 31)) |
| 2310 | { |
| 2311 | as_bad (_("illegal literal")); |
| 2312 | offs (e) = 0; |
| 2313 | } |
| 2314 | regopP->n = offs (e); |
| 2315 | return; |
| 2316 | } |
| 2317 | } |
| 2318 | |
| 2319 | /* Nothing worked */ |
| 2320 | syntax (); |
| 2321 | regopP->mode = 0; /* Register r0 is always a good one */ |
| 2322 | regopP->n = 0; |
| 2323 | regopP->special = 0; |
| 2324 | } /* parse_regop() */ |
| 2325 | |
| 2326 | /***************************************************************************** |
| 2327 | reg_fmt: generate a REG-format instruction |
| 2328 | |
| 2329 | *************************************************************************** */ |
| 2330 | static void |
| 2331 | reg_fmt (args, oP) |
| 2332 | char *args[]; /* args[0]->opcode mnemonic, args[1-3]->operands */ |
| 2333 | struct i960_opcode *oP; /* Pointer to description of instruction */ |
| 2334 | { |
| 2335 | long instr; /* Binary to be output */ |
| 2336 | struct regop regop; /* Description of register operand */ |
| 2337 | int n_ops; /* Number of operands */ |
| 2338 | |
| 2339 | instr = oP->opcode; |
| 2340 | n_ops = oP->num_ops; |
| 2341 | |
| 2342 | if (n_ops >= 1) |
| 2343 | { |
| 2344 | parse_regop (®op, args[1], oP->operand[0]); |
| 2345 | |
| 2346 | if ((n_ops == 1) && !(instr & M3)) |
| 2347 | { |
| 2348 | /* 1-operand instruction in which the dst field should |
| 2349 | * be used (instead of src1). |
| 2350 | */ |
| 2351 | regop.n <<= 19; |
| 2352 | if (regop.special) |
| 2353 | { |
| 2354 | regop.mode = regop.special; |
| 2355 | } |
| 2356 | regop.mode <<= 13; |
| 2357 | regop.special = 0; |
| 2358 | } |
| 2359 | else |
| 2360 | { |
| 2361 | /* regop.n goes in bit 0, needs no shifting */ |
| 2362 | regop.mode <<= 11; |
| 2363 | regop.special <<= 5; |
| 2364 | } |
| 2365 | instr |= regop.n | regop.mode | regop.special; |
| 2366 | } |
| 2367 | |
| 2368 | if (n_ops >= 2) |
| 2369 | { |
| 2370 | parse_regop (®op, args[2], oP->operand[1]); |
| 2371 | |
| 2372 | if ((n_ops == 2) && !(instr & M3)) |
| 2373 | { |
| 2374 | /* 2-operand instruction in which the dst field should |
| 2375 | * be used instead of src2). |
| 2376 | */ |
| 2377 | regop.n <<= 19; |
| 2378 | if (regop.special) |
| 2379 | { |
| 2380 | regop.mode = regop.special; |
| 2381 | } |
| 2382 | regop.mode <<= 13; |
| 2383 | regop.special = 0; |
| 2384 | } |
| 2385 | else |
| 2386 | { |
| 2387 | regop.n <<= 14; |
| 2388 | regop.mode <<= 12; |
| 2389 | regop.special <<= 6; |
| 2390 | } |
| 2391 | instr |= regop.n | regop.mode | regop.special; |
| 2392 | } |
| 2393 | if (n_ops == 3) |
| 2394 | { |
| 2395 | parse_regop (®op, args[3], oP->operand[2]); |
| 2396 | if (regop.special) |
| 2397 | { |
| 2398 | regop.mode = regop.special; |
| 2399 | } |
| 2400 | instr |= (regop.n <<= 19) | (regop.mode <<= 13); |
| 2401 | } |
| 2402 | emit (instr); |
| 2403 | } |
| 2404 | |
| 2405 | /***************************************************************************** |
| 2406 | relax_cobr: |
| 2407 | Replace cobr instruction in a code fragment with equivalent branch and |
| 2408 | compare instructions, so it can reach beyond a 13-bit displacement. |
| 2409 | Set up an address fix/relocation for the new branch instruction. |
| 2410 | |
| 2411 | *************************************************************************** */ |
| 2412 | |
| 2413 | /* This "conditional jump" table maps cobr instructions into |
| 2414 | equivalent compare and branch opcodes. */ |
| 2415 | static const |
| 2416 | struct |
| 2417 | { |
| 2418 | long compare; |
| 2419 | long branch; |
| 2420 | } |
| 2421 | |
| 2422 | coj[] = |
| 2423 | { /* COBR OPCODE: */ |
| 2424 | { CHKBIT, BNO }, /* 0x30 - bbc */ |
| 2425 | { CMPO, BG }, /* 0x31 - cmpobg */ |
| 2426 | { CMPO, BE }, /* 0x32 - cmpobe */ |
| 2427 | { CMPO, BGE }, /* 0x33 - cmpobge */ |
| 2428 | { CMPO, BL }, /* 0x34 - cmpobl */ |
| 2429 | { CMPO, BNE }, /* 0x35 - cmpobne */ |
| 2430 | { CMPO, BLE }, /* 0x36 - cmpoble */ |
| 2431 | { CHKBIT, BO }, /* 0x37 - bbs */ |
| 2432 | { CMPI, BNO }, /* 0x38 - cmpibno */ |
| 2433 | { CMPI, BG }, /* 0x39 - cmpibg */ |
| 2434 | { CMPI, BE }, /* 0x3a - cmpibe */ |
| 2435 | { CMPI, BGE }, /* 0x3b - cmpibge */ |
| 2436 | { CMPI, BL }, /* 0x3c - cmpibl */ |
| 2437 | { CMPI, BNE }, /* 0x3d - cmpibne */ |
| 2438 | { CMPI, BLE }, /* 0x3e - cmpible */ |
| 2439 | { CMPI, BO }, /* 0x3f - cmpibo */ |
| 2440 | }; |
| 2441 | |
| 2442 | static void |
| 2443 | relax_cobr (fragP) |
| 2444 | register fragS *fragP; /* fragP->fr_opcode is assumed to point to |
| 2445 | * the cobr instruction, which comes at the |
| 2446 | * end of the code fragment. |
| 2447 | */ |
| 2448 | { |
| 2449 | int opcode, src1, src2, m1, s2; |
| 2450 | /* Bit fields from cobr instruction */ |
| 2451 | long bp_bits; /* Branch prediction bits from cobr instruction */ |
| 2452 | long instr; /* A single i960 instruction */ |
| 2453 | /* ->instruction to be replaced */ |
| 2454 | char *iP; |
| 2455 | fixS *fixP; /* Relocation that can be done at assembly time */ |
| 2456 | |
| 2457 | /* PICK UP & PARSE COBR INSTRUCTION */ |
| 2458 | iP = fragP->fr_opcode; |
| 2459 | instr = md_chars_to_number (iP, 4); |
| 2460 | opcode = ((instr >> 24) & 0xff) - 0x30; /* "-0x30" for table index */ |
| 2461 | src1 = (instr >> 19) & 0x1f; |
| 2462 | m1 = (instr >> 13) & 1; |
| 2463 | s2 = instr & 1; |
| 2464 | src2 = (instr >> 14) & 0x1f; |
| 2465 | bp_bits = instr & BP_MASK; |
| 2466 | |
| 2467 | /* GENERATE AND OUTPUT COMPARE INSTRUCTION */ |
| 2468 | instr = coj[opcode].compare |
| 2469 | | src1 | (m1 << 11) | (s2 << 6) | (src2 << 14); |
| 2470 | md_number_to_chars (iP, instr, 4); |
| 2471 | |
| 2472 | /* OUTPUT BRANCH INSTRUCTION */ |
| 2473 | md_number_to_chars (iP + 4, coj[opcode].branch | bp_bits, 4); |
| 2474 | |
| 2475 | /* SET UP ADDRESS FIXUP/RELOCATION */ |
| 2476 | fixP = fix_new (fragP, |
| 2477 | iP + 4 - fragP->fr_literal, |
| 2478 | 4, |
| 2479 | fragP->fr_symbol, |
| 2480 | fragP->fr_offset, |
| 2481 | 1, |
| 2482 | NO_RELOC); |
| 2483 | |
| 2484 | fixP->fx_bit_fixP = (bit_fixS *) 24; /* Store size of bit field */ |
| 2485 | |
| 2486 | fragP->fr_fix += 4; |
| 2487 | frag_wane (fragP); |
| 2488 | } |
| 2489 | |
| 2490 | /***************************************************************************** |
| 2491 | reloc_callj: Relocate a 'callj' instruction |
| 2492 | |
| 2493 | This is a "non-(GNU)-standard" machine-dependent hook. The base |
| 2494 | assembler calls it when it decides it can relocate an address at |
| 2495 | assembly time instead of emitting a relocation directive. |
| 2496 | |
| 2497 | Check to see if the relocation involves a 'callj' instruction to a: |
| 2498 | sysproc: Replace the default 'call' instruction with a 'calls' |
| 2499 | leafproc: Replace the default 'call' instruction with a 'bal'. |
| 2500 | other proc: Do nothing. |
| 2501 | |
| 2502 | See b.out.h for details on the 'n_other' field in a symbol structure. |
| 2503 | |
| 2504 | IMPORTANT!: |
| 2505 | Assumes the caller has already figured out, in the case of a leafproc, |
| 2506 | to use the 'bal' entry point, and has substituted that symbol into the |
| 2507 | passed fixup structure. |
| 2508 | |
| 2509 | *************************************************************************** */ |
| 2510 | int |
| 2511 | reloc_callj (fixP) |
| 2512 | /* Relocation that can be done at assembly time */ |
| 2513 | fixS *fixP; |
| 2514 | { |
| 2515 | /* Points to the binary for the instruction being relocated. */ |
| 2516 | char *where; |
| 2517 | |
| 2518 | if (!fixP->fx_tcbit) |
| 2519 | { |
| 2520 | /* This wasn't a callj instruction in the first place */ |
| 2521 | return 0; |
| 2522 | } |
| 2523 | |
| 2524 | where = fixP->fx_frag->fr_literal + fixP->fx_where; |
| 2525 | |
| 2526 | if (TC_S_IS_SYSPROC (fixP->fx_addsy)) |
| 2527 | { |
| 2528 | /* Symbol is a .sysproc: replace 'call' with 'calls'. System |
| 2529 | procedure number is (other-1). */ |
| 2530 | md_number_to_chars (where, CALLS | TC_S_GET_SYSPROC (fixP->fx_addsy), 4); |
| 2531 | |
| 2532 | /* Nothing else needs to be done for this instruction. Make |
| 2533 | sure 'md_number_to_field()' will perform a no-op. */ |
| 2534 | fixP->fx_bit_fixP = (bit_fixS *) 1; |
| 2535 | } |
| 2536 | else if (TC_S_IS_CALLNAME (fixP->fx_addsy)) |
| 2537 | { |
| 2538 | /* Should not happen: see block comment above */ |
| 2539 | as_fatal (_("Trying to 'bal' to %s"), S_GET_NAME (fixP->fx_addsy)); |
| 2540 | } |
| 2541 | else if (TC_S_IS_BALNAME (fixP->fx_addsy)) |
| 2542 | { |
| 2543 | /* Replace 'call' with 'bal'; both instructions have the same |
| 2544 | format, so calling code should complete relocation as if |
| 2545 | nothing happened here. */ |
| 2546 | md_number_to_chars (where, BAL, 4); |
| 2547 | } |
| 2548 | else if (TC_S_IS_BADPROC (fixP->fx_addsy)) |
| 2549 | { |
| 2550 | as_bad (_("Looks like a proc, but can't tell what kind.\n")); |
| 2551 | } /* switch on proc type */ |
| 2552 | |
| 2553 | /* else Symbol is neither a sysproc nor a leafproc */ |
| 2554 | return 0; |
| 2555 | } |
| 2556 | |
| 2557 | /***************************************************************************** |
| 2558 | s_leafproc: process .leafproc pseudo-op |
| 2559 | |
| 2560 | .leafproc takes two arguments, the second one is optional: |
| 2561 | arg[1]: name of 'call' entry point to leaf procedure |
| 2562 | arg[2]: name of 'bal' entry point to leaf procedure |
| 2563 | |
| 2564 | If the two arguments are identical, or if the second one is missing, |
| 2565 | the first argument is taken to be the 'bal' entry point. |
| 2566 | |
| 2567 | If there are 2 distinct arguments, we must make sure that the 'bal' |
| 2568 | entry point immediately follows the 'call' entry point in the linked |
| 2569 | list of symbols. |
| 2570 | |
| 2571 | *************************************************************************** */ |
| 2572 | static void |
| 2573 | s_leafproc (n_ops, args) |
| 2574 | int n_ops; /* Number of operands */ |
| 2575 | char *args[]; /* args[1]->1st operand, args[2]->2nd operand */ |
| 2576 | { |
| 2577 | symbolS *callP; /* Pointer to leafproc 'call' entry point symbol */ |
| 2578 | symbolS *balP; /* Pointer to leafproc 'bal' entry point symbol */ |
| 2579 | |
| 2580 | if ((n_ops != 1) && (n_ops != 2)) |
| 2581 | { |
| 2582 | as_bad (_("should have 1 or 2 operands")); |
| 2583 | return; |
| 2584 | } /* Check number of arguments */ |
| 2585 | |
| 2586 | /* Find or create symbol for 'call' entry point. */ |
| 2587 | callP = symbol_find_or_make (args[1]); |
| 2588 | |
| 2589 | if (TC_S_IS_CALLNAME (callP)) |
| 2590 | { |
| 2591 | as_warn (_("Redefining leafproc %s"), S_GET_NAME (callP)); |
| 2592 | } /* is leafproc */ |
| 2593 | |
| 2594 | /* If that was the only argument, use it as the 'bal' entry point. |
| 2595 | * Otherwise, mark it as the 'call' entry point and find or create |
| 2596 | * another symbol for the 'bal' entry point. |
| 2597 | */ |
| 2598 | if ((n_ops == 1) || !strcmp (args[1], args[2])) |
| 2599 | { |
| 2600 | TC_S_FORCE_TO_BALNAME (callP); |
| 2601 | |
| 2602 | } |
| 2603 | else |
| 2604 | { |
| 2605 | TC_S_FORCE_TO_CALLNAME (callP); |
| 2606 | |
| 2607 | balP = symbol_find_or_make (args[2]); |
| 2608 | if (TC_S_IS_CALLNAME (balP)) |
| 2609 | { |
| 2610 | as_warn (_("Redefining leafproc %s"), S_GET_NAME (balP)); |
| 2611 | } |
| 2612 | TC_S_FORCE_TO_BALNAME (balP); |
| 2613 | |
| 2614 | #ifndef OBJ_ELF |
| 2615 | tc_set_bal_of_call (callP, balP); |
| 2616 | #endif |
| 2617 | } /* if only one arg, or the args are the same */ |
| 2618 | } |
| 2619 | |
| 2620 | /* |
| 2621 | s_sysproc: process .sysproc pseudo-op |
| 2622 | |
| 2623 | .sysproc takes two arguments: |
| 2624 | arg[1]: name of entry point to system procedure |
| 2625 | arg[2]: 'entry_num' (index) of system procedure in the range |
| 2626 | [0,31] inclusive. |
| 2627 | |
| 2628 | For [ab].out, we store the 'entrynum' in the 'n_other' field of |
| 2629 | the symbol. Since that entry is normally 0, we bias 'entrynum' |
| 2630 | by adding 1 to it. It must be unbiased before it is used. */ |
| 2631 | static void |
| 2632 | s_sysproc (n_ops, args) |
| 2633 | int n_ops; /* Number of operands */ |
| 2634 | char *args[]; /* args[1]->1st operand, args[2]->2nd operand */ |
| 2635 | { |
| 2636 | expressionS exp; |
| 2637 | symbolS *symP; |
| 2638 | |
| 2639 | if (n_ops != 2) |
| 2640 | { |
| 2641 | as_bad (_("should have two operands")); |
| 2642 | return; |
| 2643 | } /* bad arg count */ |
| 2644 | |
| 2645 | /* Parse "entry_num" argument and check it for validity. */ |
| 2646 | parse_expr (args[2], &exp); |
| 2647 | if (exp.X_op != O_constant |
| 2648 | || (offs (exp) < 0) |
| 2649 | || (offs (exp) > 31)) |
| 2650 | { |
| 2651 | as_bad (_("'entry_num' must be absolute number in [0,31]")); |
| 2652 | return; |
| 2653 | } |
| 2654 | |
| 2655 | /* Find/make symbol and stick entry number (biased by +1) into it */ |
| 2656 | symP = symbol_find_or_make (args[1]); |
| 2657 | |
| 2658 | if (TC_S_IS_SYSPROC (symP)) |
| 2659 | { |
| 2660 | as_warn (_("Redefining entrynum for sysproc %s"), S_GET_NAME (symP)); |
| 2661 | } /* redefining */ |
| 2662 | |
| 2663 | TC_S_SET_SYSPROC (symP, offs (exp)); /* encode entry number */ |
| 2664 | TC_S_FORCE_TO_SYSPROC (symP); |
| 2665 | } |
| 2666 | |
| 2667 | /***************************************************************************** |
| 2668 | shift_ok: |
| 2669 | Determine if a "shlo" instruction can be used to implement a "ldconst". |
| 2670 | This means that some number X < 32 can be shifted left to produce the |
| 2671 | constant of interest. |
| 2672 | |
| 2673 | Return the shift count, or 0 if we can't do it. |
| 2674 | Caller calculates X by shifting original constant right 'shift' places. |
| 2675 | |
| 2676 | *************************************************************************** */ |
| 2677 | static int |
| 2678 | shift_ok (n) |
| 2679 | int n; /* The constant of interest */ |
| 2680 | { |
| 2681 | int shift; /* The shift count */ |
| 2682 | |
| 2683 | if (n <= 0) |
| 2684 | { |
| 2685 | /* Can't do it for negative numbers */ |
| 2686 | return 0; |
| 2687 | } |
| 2688 | |
| 2689 | /* Shift 'n' right until a 1 is about to be lost */ |
| 2690 | for (shift = 0; (n & 1) == 0; shift++) |
| 2691 | { |
| 2692 | n >>= 1; |
| 2693 | } |
| 2694 | |
| 2695 | if (n >= 32) |
| 2696 | { |
| 2697 | return 0; |
| 2698 | } |
| 2699 | return shift; |
| 2700 | } |
| 2701 | |
| 2702 | /* syntax: issue syntax error */ |
| 2703 | |
| 2704 | static void |
| 2705 | syntax () |
| 2706 | { |
| 2707 | as_bad (_("syntax error")); |
| 2708 | } /* syntax() */ |
| 2709 | |
| 2710 | /* targ_has_sfr: |
| 2711 | |
| 2712 | Return TRUE iff the target architecture supports the specified |
| 2713 | special-function register (sfr). */ |
| 2714 | |
| 2715 | static int |
| 2716 | targ_has_sfr (n) |
| 2717 | int n; /* Number (0-31) of sfr */ |
| 2718 | { |
| 2719 | switch (architecture) |
| 2720 | { |
| 2721 | case ARCH_KA: |
| 2722 | case ARCH_KB: |
| 2723 | case ARCH_MC: |
| 2724 | case ARCH_JX: |
| 2725 | return 0; |
| 2726 | case ARCH_HX: |
| 2727 | return ((0 <= n) && (n <= 4)); |
| 2728 | case ARCH_CA: |
| 2729 | default: |
| 2730 | return ((0 <= n) && (n <= 2)); |
| 2731 | } |
| 2732 | } |
| 2733 | |
| 2734 | /* targ_has_iclass: |
| 2735 | |
| 2736 | Return TRUE iff the target architecture supports the indicated |
| 2737 | class of instructions. */ |
| 2738 | static int |
| 2739 | targ_has_iclass (ic) |
| 2740 | /* Instruction class; one of: |
| 2741 | I_BASE, I_CX, I_DEC, I_KX, I_FP, I_MIL, I_CASIM, I_CX2, I_HX, I_HX2 |
| 2742 | */ |
| 2743 | int ic; |
| 2744 | { |
| 2745 | iclasses_seen |= ic; |
| 2746 | switch (architecture) |
| 2747 | { |
| 2748 | case ARCH_KA: |
| 2749 | return ic & (I_BASE | I_KX); |
| 2750 | case ARCH_KB: |
| 2751 | return ic & (I_BASE | I_KX | I_FP | I_DEC); |
| 2752 | case ARCH_MC: |
| 2753 | return ic & (I_BASE | I_KX | I_FP | I_DEC | I_MIL); |
| 2754 | case ARCH_CA: |
| 2755 | return ic & (I_BASE | I_CX | I_CX2 | I_CASIM); |
| 2756 | case ARCH_JX: |
| 2757 | return ic & (I_BASE | I_CX2 | I_JX); |
| 2758 | case ARCH_HX: |
| 2759 | return ic & (I_BASE | I_CX2 | I_JX | I_HX); |
| 2760 | default: |
| 2761 | if ((iclasses_seen & (I_KX | I_FP | I_DEC | I_MIL)) |
| 2762 | && (iclasses_seen & (I_CX | I_CX2))) |
| 2763 | { |
| 2764 | as_warn (_("architecture of opcode conflicts with that of earlier instruction(s)")); |
| 2765 | iclasses_seen &= ~ic; |
| 2766 | } |
| 2767 | return 1; |
| 2768 | } |
| 2769 | } |
| 2770 | |
| 2771 | /* Handle the MRI .endian pseudo-op. */ |
| 2772 | |
| 2773 | static void |
| 2774 | s_endian (ignore) |
| 2775 | int ignore ATTRIBUTE_UNUSED; |
| 2776 | { |
| 2777 | char *name; |
| 2778 | char c; |
| 2779 | |
| 2780 | name = input_line_pointer; |
| 2781 | c = get_symbol_end (); |
| 2782 | if (strcasecmp (name, "little") == 0) |
| 2783 | ; |
| 2784 | else if (strcasecmp (name, "big") == 0) |
| 2785 | as_bad (_("big endian mode is not supported")); |
| 2786 | else |
| 2787 | as_warn (_("ignoring unrecognized .endian type `%s'"), name); |
| 2788 | |
| 2789 | *input_line_pointer = c; |
| 2790 | |
| 2791 | demand_empty_rest_of_line (); |
| 2792 | } |
| 2793 | |
| 2794 | /* We have no need to default values of symbols. */ |
| 2795 | |
| 2796 | symbolS * |
| 2797 | md_undefined_symbol (name) |
| 2798 | char *name ATTRIBUTE_UNUSED; |
| 2799 | { |
| 2800 | return 0; |
| 2801 | } |
| 2802 | |
| 2803 | /* Exactly what point is a PC-relative offset relative TO? |
| 2804 | On the i960, they're relative to the address of the instruction, |
| 2805 | which we have set up as the address of the fixup too. */ |
| 2806 | long |
| 2807 | md_pcrel_from (fixP) |
| 2808 | fixS *fixP; |
| 2809 | { |
| 2810 | return fixP->fx_where + fixP->fx_frag->fr_address; |
| 2811 | } |
| 2812 | |
| 2813 | void |
| 2814 | md_apply_fix3 (fixP, valP, seg) |
| 2815 | fixS *fixP; |
| 2816 | valueT *valP; |
| 2817 | segT seg ATTRIBUTE_UNUSED; |
| 2818 | { |
| 2819 | long val = *valP; |
| 2820 | char *place = fixP->fx_where + fixP->fx_frag->fr_literal; |
| 2821 | |
| 2822 | if (!fixP->fx_bit_fixP) |
| 2823 | { |
| 2824 | #ifndef BFD_ASSEMBLER |
| 2825 | /* For callx, we always want to write out zero, and emit a |
| 2826 | symbolic relocation. */ |
| 2827 | if (fixP->fx_bsr) |
| 2828 | val = 0; |
| 2829 | |
| 2830 | fixP->fx_addnumber = val; |
| 2831 | #endif |
| 2832 | |
| 2833 | md_number_to_imm (place, val, fixP->fx_size); |
| 2834 | } |
| 2835 | else if ((int) fixP->fx_bit_fixP == 13 |
| 2836 | && fixP->fx_addsy != NULL |
| 2837 | && S_GET_SEGMENT (fixP->fx_addsy) == undefined_section) |
| 2838 | { |
| 2839 | /* This is a COBR instruction. They have only a |
| 2840 | 13-bit displacement and are only to be used |
| 2841 | for local branches: flag as error, don't generate |
| 2842 | relocation. */ |
| 2843 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 2844 | _("can't use COBR format with external label")); |
| 2845 | fixP->fx_addsy = NULL; |
| 2846 | } |
| 2847 | else |
| 2848 | md_number_to_field (place, val, fixP->fx_bit_fixP); |
| 2849 | |
| 2850 | if (fixP->fx_addsy == NULL) |
| 2851 | fixP->fx_done = 1; |
| 2852 | } |
| 2853 | |
| 2854 | #if defined(OBJ_AOUT) | defined(OBJ_BOUT) |
| 2855 | void |
| 2856 | tc_bout_fix_to_chars (where, fixP, segment_address_in_file) |
| 2857 | char *where; |
| 2858 | fixS *fixP; |
| 2859 | relax_addressT segment_address_in_file; |
| 2860 | { |
| 2861 | static const unsigned char nbytes_r_length[] = {42, 0, 1, 42, 2}; |
| 2862 | struct relocation_info ri; |
| 2863 | symbolS *symbolP; |
| 2864 | |
| 2865 | memset ((char *) &ri, '\0', sizeof (ri)); |
| 2866 | symbolP = fixP->fx_addsy; |
| 2867 | know (symbolP != 0 || fixP->fx_r_type != NO_RELOC); |
| 2868 | ri.r_bsr = fixP->fx_bsr; /*SAC LD RELAX HACK */ |
| 2869 | /* These two 'cuz of NS32K */ |
| 2870 | ri.r_callj = fixP->fx_tcbit; |
| 2871 | if (fixP->fx_bit_fixP) |
| 2872 | ri.r_length = 2; |
| 2873 | else |
| 2874 | ri.r_length = nbytes_r_length[fixP->fx_size]; |
| 2875 | ri.r_pcrel = fixP->fx_pcrel; |
| 2876 | ri.r_address = fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file; |
| 2877 | |
| 2878 | if (fixP->fx_r_type != NO_RELOC) |
| 2879 | { |
| 2880 | switch (fixP->fx_r_type) |
| 2881 | { |
| 2882 | case rs_align: |
| 2883 | ri.r_index = -2; |
| 2884 | ri.r_pcrel = 1; |
| 2885 | ri.r_length = fixP->fx_size - 1; |
| 2886 | break; |
| 2887 | case rs_org: |
| 2888 | ri.r_index = -2; |
| 2889 | ri.r_pcrel = 0; |
| 2890 | break; |
| 2891 | case rs_fill: |
| 2892 | ri.r_index = -1; |
| 2893 | break; |
| 2894 | default: |
| 2895 | abort (); |
| 2896 | } |
| 2897 | ri.r_extern = 0; |
| 2898 | } |
| 2899 | else if (linkrelax || !S_IS_DEFINED (symbolP) || fixP->fx_bsr) |
| 2900 | { |
| 2901 | ri.r_extern = 1; |
| 2902 | ri.r_index = symbolP->sy_number; |
| 2903 | } |
| 2904 | else |
| 2905 | { |
| 2906 | ri.r_extern = 0; |
| 2907 | ri.r_index = S_GET_TYPE (symbolP); |
| 2908 | } |
| 2909 | |
| 2910 | /* Output the relocation information in machine-dependent form. */ |
| 2911 | md_ri_to_chars (where, &ri); |
| 2912 | } |
| 2913 | |
| 2914 | #endif /* OBJ_AOUT or OBJ_BOUT */ |
| 2915 | |
| 2916 | #if defined (OBJ_COFF) && defined (BFD) |
| 2917 | short |
| 2918 | tc_coff_fix2rtype (fixP) |
| 2919 | fixS *fixP; |
| 2920 | { |
| 2921 | if (fixP->fx_bsr) |
| 2922 | abort (); |
| 2923 | |
| 2924 | if (fixP->fx_pcrel == 0 && fixP->fx_size == 4) |
| 2925 | return R_RELLONG; |
| 2926 | |
| 2927 | if (fixP->fx_pcrel != 0 && fixP->fx_size == 4) |
| 2928 | return R_IPRMED; |
| 2929 | |
| 2930 | abort (); |
| 2931 | return 0; |
| 2932 | } |
| 2933 | |
| 2934 | int |
| 2935 | tc_coff_sizemachdep (frag) |
| 2936 | fragS *frag; |
| 2937 | { |
| 2938 | if (frag->fr_next) |
| 2939 | return frag->fr_next->fr_address - frag->fr_address; |
| 2940 | else |
| 2941 | return 0; |
| 2942 | } |
| 2943 | #endif |
| 2944 | |
| 2945 | /* Align an address by rounding it up to the specified boundary. */ |
| 2946 | valueT |
| 2947 | md_section_align (seg, addr) |
| 2948 | segT seg; |
| 2949 | valueT addr; /* Address to be rounded up */ |
| 2950 | { |
| 2951 | int align; |
| 2952 | #ifdef BFD_ASSEMBLER |
| 2953 | align = bfd_get_section_alignment (stdoutput, seg); |
| 2954 | #else |
| 2955 | align = section_alignment[(int) seg]; |
| 2956 | #endif |
| 2957 | return (addr + (1 << align) - 1) & (-1 << align); |
| 2958 | } |
| 2959 | |
| 2960 | extern int coff_flags; |
| 2961 | |
| 2962 | #ifdef OBJ_COFF |
| 2963 | void |
| 2964 | tc_headers_hook (headers) |
| 2965 | object_headers *headers; |
| 2966 | { |
| 2967 | switch (architecture) |
| 2968 | { |
| 2969 | case ARCH_KA: |
| 2970 | coff_flags |= F_I960KA; |
| 2971 | break; |
| 2972 | |
| 2973 | case ARCH_KB: |
| 2974 | coff_flags |= F_I960KB; |
| 2975 | break; |
| 2976 | |
| 2977 | case ARCH_MC: |
| 2978 | coff_flags |= F_I960MC; |
| 2979 | break; |
| 2980 | |
| 2981 | case ARCH_CA: |
| 2982 | coff_flags |= F_I960CA; |
| 2983 | break; |
| 2984 | |
| 2985 | case ARCH_JX: |
| 2986 | coff_flags |= F_I960JX; |
| 2987 | break; |
| 2988 | |
| 2989 | case ARCH_HX: |
| 2990 | coff_flags |= F_I960HX; |
| 2991 | break; |
| 2992 | |
| 2993 | default: |
| 2994 | if (iclasses_seen == I_BASE) |
| 2995 | coff_flags |= F_I960CORE; |
| 2996 | else if (iclasses_seen & I_CX) |
| 2997 | coff_flags |= F_I960CA; |
| 2998 | else if (iclasses_seen & I_HX) |
| 2999 | coff_flags |= F_I960HX; |
| 3000 | else if (iclasses_seen & I_JX) |
| 3001 | coff_flags |= F_I960JX; |
| 3002 | else if (iclasses_seen & I_CX2) |
| 3003 | coff_flags |= F_I960CA; |
| 3004 | else if (iclasses_seen & I_MIL) |
| 3005 | coff_flags |= F_I960MC; |
| 3006 | else if (iclasses_seen & (I_DEC | I_FP)) |
| 3007 | coff_flags |= F_I960KB; |
| 3008 | else |
| 3009 | coff_flags |= F_I960KA; |
| 3010 | break; |
| 3011 | } |
| 3012 | |
| 3013 | if (flag_readonly_data_in_text) |
| 3014 | { |
| 3015 | headers->filehdr.f_magic = I960RWMAGIC; |
| 3016 | headers->aouthdr.magic = OMAGIC; |
| 3017 | } |
| 3018 | else |
| 3019 | { |
| 3020 | headers->filehdr.f_magic = I960ROMAGIC; |
| 3021 | headers->aouthdr.magic = NMAGIC; |
| 3022 | } /* set magic numbers */ |
| 3023 | } |
| 3024 | |
| 3025 | #endif /* OBJ_COFF */ |
| 3026 | |
| 3027 | #ifndef BFD_ASSEMBLER |
| 3028 | |
| 3029 | /* Things going on here: |
| 3030 | |
| 3031 | For bout, We need to assure a couple of simplifying |
| 3032 | assumptions about leafprocs for the linker: the leafproc |
| 3033 | entry symbols will be defined in the same assembly in |
| 3034 | which they're declared with the '.leafproc' directive; |
| 3035 | and if a leafproc has both 'call' and 'bal' entry points |
| 3036 | they are both global or both local. |
| 3037 | |
| 3038 | For coff, the call symbol has a second aux entry that |
| 3039 | contains the bal entry point. The bal symbol becomes a |
| 3040 | label. |
| 3041 | |
| 3042 | For coff representation, the call symbol has a second aux entry that |
| 3043 | contains the bal entry point. The bal symbol becomes a label. */ |
| 3044 | |
| 3045 | void |
| 3046 | tc_crawl_symbol_chain (headers) |
| 3047 | object_headers *headers ATTRIBUTE_UNUSED; |
| 3048 | { |
| 3049 | symbolS *symbolP; |
| 3050 | |
| 3051 | for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) |
| 3052 | { |
| 3053 | #ifdef OBJ_COFF |
| 3054 | if (TC_S_IS_SYSPROC (symbolP)) |
| 3055 | { |
| 3056 | /* second aux entry already contains the sysproc number */ |
| 3057 | S_SET_NUMBER_AUXILIARY (symbolP, 2); |
| 3058 | S_SET_STORAGE_CLASS (symbolP, C_SCALL); |
| 3059 | S_SET_DATA_TYPE (symbolP, S_GET_DATA_TYPE (symbolP) | (DT_FCN << N_BTSHFT)); |
| 3060 | continue; |
| 3061 | } /* rewrite sysproc */ |
| 3062 | #endif /* OBJ_COFF */ |
| 3063 | |
| 3064 | if (!TC_S_IS_BALNAME (symbolP) && !TC_S_IS_CALLNAME (symbolP)) |
| 3065 | { |
| 3066 | continue; |
| 3067 | } /* Not a leafproc symbol */ |
| 3068 | |
| 3069 | if (!S_IS_DEFINED (symbolP)) |
| 3070 | { |
| 3071 | as_bad (_("leafproc symbol '%s' undefined"), S_GET_NAME (symbolP)); |
| 3072 | } /* undefined leaf */ |
| 3073 | |
| 3074 | if (TC_S_IS_CALLNAME (symbolP)) |
| 3075 | { |
| 3076 | symbolS *balP = tc_get_bal_of_call (symbolP); |
| 3077 | if (S_IS_EXTERNAL (symbolP) != S_IS_EXTERNAL (balP)) |
| 3078 | { |
| 3079 | S_SET_EXTERNAL (symbolP); |
| 3080 | S_SET_EXTERNAL (balP); |
| 3081 | as_warn (_("Warning: making leafproc entries %s and %s both global\n"), |
| 3082 | S_GET_NAME (symbolP), S_GET_NAME (balP)); |
| 3083 | } /* externality mismatch */ |
| 3084 | } /* if callname */ |
| 3085 | } /* walk the symbol chain */ |
| 3086 | } |
| 3087 | |
| 3088 | #endif /* ! BFD_ASSEMBLER */ |
| 3089 | |
| 3090 | /* For aout or bout, the bal immediately follows the call. |
| 3091 | |
| 3092 | For coff, we cheat and store a pointer to the bal symbol in the |
| 3093 | second aux entry of the call. */ |
| 3094 | |
| 3095 | #undef OBJ_ABOUT |
| 3096 | #ifdef OBJ_AOUT |
| 3097 | #define OBJ_ABOUT |
| 3098 | #endif |
| 3099 | #ifdef OBJ_BOUT |
| 3100 | #define OBJ_ABOUT |
| 3101 | #endif |
| 3102 | |
| 3103 | void |
| 3104 | tc_set_bal_of_call (callP, balP) |
| 3105 | symbolS *callP ATTRIBUTE_UNUSED; |
| 3106 | symbolS *balP ATTRIBUTE_UNUSED; |
| 3107 | { |
| 3108 | know (TC_S_IS_CALLNAME (callP)); |
| 3109 | know (TC_S_IS_BALNAME (balP)); |
| 3110 | |
| 3111 | #ifdef OBJ_COFF |
| 3112 | |
| 3113 | callP->sy_tc = balP; |
| 3114 | S_SET_NUMBER_AUXILIARY (callP, 2); |
| 3115 | |
| 3116 | #else /* ! OBJ_COFF */ |
| 3117 | #ifdef OBJ_ABOUT |
| 3118 | |
| 3119 | /* If the 'bal' entry doesn't immediately follow the 'call' |
| 3120 | * symbol, unlink it from the symbol list and re-insert it. |
| 3121 | */ |
| 3122 | if (symbol_next (callP) != balP) |
| 3123 | { |
| 3124 | symbol_remove (balP, &symbol_rootP, &symbol_lastP); |
| 3125 | symbol_append (balP, callP, &symbol_rootP, &symbol_lastP); |
| 3126 | } /* if not in order */ |
| 3127 | |
| 3128 | #else /* ! OBJ_ABOUT */ |
| 3129 | as_fatal ("Only supported for a.out, b.out, or COFF"); |
| 3130 | #endif /* ! OBJ_ABOUT */ |
| 3131 | #endif /* ! OBJ_COFF */ |
| 3132 | } |
| 3133 | |
| 3134 | symbolS * |
| 3135 | tc_get_bal_of_call (callP) |
| 3136 | symbolS *callP ATTRIBUTE_UNUSED; |
| 3137 | { |
| 3138 | symbolS *retval; |
| 3139 | |
| 3140 | know (TC_S_IS_CALLNAME (callP)); |
| 3141 | |
| 3142 | #ifdef OBJ_COFF |
| 3143 | retval = callP->sy_tc; |
| 3144 | #else |
| 3145 | #ifdef OBJ_ABOUT |
| 3146 | retval = symbol_next (callP); |
| 3147 | #else |
| 3148 | as_fatal ("Only supported for a.out, b.out, or COFF"); |
| 3149 | #endif /* ! OBJ_ABOUT */ |
| 3150 | #endif /* ! OBJ_COFF */ |
| 3151 | |
| 3152 | know (TC_S_IS_BALNAME (retval)); |
| 3153 | return retval; |
| 3154 | } /* _tc_get_bal_of_call() */ |
| 3155 | |
| 3156 | #ifdef OBJ_COFF |
| 3157 | void |
| 3158 | tc_coff_symbol_emit_hook (symbolP) |
| 3159 | symbolS *symbolP ATTRIBUTE_UNUSED; |
| 3160 | { |
| 3161 | if (TC_S_IS_CALLNAME (symbolP)) |
| 3162 | { |
| 3163 | symbolS *balP = tc_get_bal_of_call (symbolP); |
| 3164 | |
| 3165 | #if 0 |
| 3166 | /* second aux entry contains the bal entry point */ |
| 3167 | S_SET_NUMBER_AUXILIARY (symbolP, 2); |
| 3168 | #endif |
| 3169 | symbolP->sy_symbol.ost_auxent[1].x_bal.x_balntry = S_GET_VALUE (balP); |
| 3170 | if (S_GET_STORAGE_CLASS (symbolP) == C_EXT) |
| 3171 | S_SET_STORAGE_CLASS (symbolP, C_LEAFEXT); |
| 3172 | else |
| 3173 | S_SET_STORAGE_CLASS (symbolP, C_LEAFSTAT); |
| 3174 | S_SET_DATA_TYPE (symbolP, S_GET_DATA_TYPE (symbolP) | (DT_FCN << N_BTSHFT)); |
| 3175 | /* fix up the bal symbol */ |
| 3176 | S_SET_STORAGE_CLASS (balP, C_LABEL); |
| 3177 | } /* only on calls */ |
| 3178 | } |
| 3179 | #endif /* OBJ_COFF */ |
| 3180 | |
| 3181 | void |
| 3182 | i960_handle_align (fragp) |
| 3183 | fragS *fragp ATTRIBUTE_UNUSED; |
| 3184 | { |
| 3185 | if (!linkrelax) |
| 3186 | return; |
| 3187 | |
| 3188 | #ifndef OBJ_BOUT |
| 3189 | |
| 3190 | as_bad (_("option --link-relax is only supported in b.out format")); |
| 3191 | linkrelax = 0; |
| 3192 | return; |
| 3193 | |
| 3194 | #else |
| 3195 | |
| 3196 | /* The text section "ends" with another alignment reloc, to which we |
| 3197 | aren't adding padding. */ |
| 3198 | if (fragp->fr_next == text_last_frag |
| 3199 | || fragp->fr_next == data_last_frag) |
| 3200 | return; |
| 3201 | |
| 3202 | /* alignment directive */ |
| 3203 | fix_new (fragp, fragp->fr_fix, fragp->fr_offset, 0, 0, 0, |
| 3204 | (int) fragp->fr_type); |
| 3205 | #endif /* OBJ_BOUT */ |
| 3206 | } |
| 3207 | |
| 3208 | int |
| 3209 | i960_validate_fix (fixP, this_segment_type) |
| 3210 | fixS *fixP; |
| 3211 | segT this_segment_type ATTRIBUTE_UNUSED; |
| 3212 | { |
| 3213 | if (fixP->fx_tcbit && TC_S_IS_CALLNAME (fixP->fx_addsy)) |
| 3214 | { |
| 3215 | /* Relocation should be done via the associated 'bal' |
| 3216 | entry point symbol. */ |
| 3217 | |
| 3218 | if (!TC_S_IS_BALNAME (tc_get_bal_of_call (fixP->fx_addsy))) |
| 3219 | { |
| 3220 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 3221 | _("No 'bal' entry point for leafproc %s"), |
| 3222 | S_GET_NAME (fixP->fx_addsy)); |
| 3223 | return 0; |
| 3224 | } |
| 3225 | fixP->fx_addsy = tc_get_bal_of_call (fixP->fx_addsy); |
| 3226 | } |
| 3227 | |
| 3228 | return 1; |
| 3229 | } |
| 3230 | |
| 3231 | #ifdef BFD_ASSEMBLER |
| 3232 | |
| 3233 | /* From cgen.c: */ |
| 3234 | |
| 3235 | static short tc_bfd_fix2rtype PARAMS ((fixS *)); |
| 3236 | |
| 3237 | static short |
| 3238 | tc_bfd_fix2rtype (fixP) |
| 3239 | fixS *fixP; |
| 3240 | { |
| 3241 | #if 0 |
| 3242 | if (fixP->fx_bsr) |
| 3243 | abort (); |
| 3244 | #endif |
| 3245 | |
| 3246 | if (fixP->fx_pcrel == 0 && fixP->fx_size == 4) |
| 3247 | return BFD_RELOC_32; |
| 3248 | |
| 3249 | if (fixP->fx_pcrel != 0 && fixP->fx_size == 4) |
| 3250 | return BFD_RELOC_24_PCREL; |
| 3251 | |
| 3252 | abort (); |
| 3253 | return 0; |
| 3254 | } |
| 3255 | |
| 3256 | /* Translate internal representation of relocation info to BFD target |
| 3257 | format. |
| 3258 | |
| 3259 | FIXME: To what extent can we get all relevant targets to use this? */ |
| 3260 | |
| 3261 | arelent * |
| 3262 | tc_gen_reloc (section, fixP) |
| 3263 | asection *section ATTRIBUTE_UNUSED; |
| 3264 | fixS *fixP; |
| 3265 | { |
| 3266 | arelent * reloc; |
| 3267 | |
| 3268 | reloc = (arelent *) xmalloc (sizeof (arelent)); |
| 3269 | |
| 3270 | /* HACK: Is this right? */ |
| 3271 | fixP->fx_r_type = tc_bfd_fix2rtype (fixP); |
| 3272 | |
| 3273 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type); |
| 3274 | if (reloc->howto == (reloc_howto_type *) NULL) |
| 3275 | { |
| 3276 | as_bad_where (fixP->fx_file, fixP->fx_line, |
| 3277 | "internal error: can't export reloc type %d (`%s')", |
| 3278 | fixP->fx_r_type, |
| 3279 | bfd_get_reloc_code_name (fixP->fx_r_type)); |
| 3280 | return NULL; |
| 3281 | } |
| 3282 | |
| 3283 | assert (!fixP->fx_pcrel == !reloc->howto->pc_relative); |
| 3284 | |
| 3285 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 3286 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy); |
| 3287 | reloc->address = fixP->fx_frag->fr_address + fixP->fx_where; |
| 3288 | reloc->addend = fixP->fx_addnumber; |
| 3289 | |
| 3290 | return reloc; |
| 3291 | } |
| 3292 | |
| 3293 | /* end from cgen.c */ |
| 3294 | |
| 3295 | #endif /* BFD_ASSEMBLER */ |
| 3296 | |
| 3297 | /* end of tc-i960.c */ |