| 1 | /* Target-dependent code for Moxie. |
| 2 | |
| 3 | Copyright (C) 2009-2013 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "frame-unwind.h" |
| 23 | #include "frame-base.h" |
| 24 | #include "symtab.h" |
| 25 | #include "gdbtypes.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "gdb_string.h" |
| 29 | #include "value.h" |
| 30 | #include "inferior.h" |
| 31 | #include "symfile.h" |
| 32 | #include "objfiles.h" |
| 33 | #include "osabi.h" |
| 34 | #include "language.h" |
| 35 | #include "arch-utils.h" |
| 36 | #include "regcache.h" |
| 37 | #include "trad-frame.h" |
| 38 | #include "dis-asm.h" |
| 39 | #include "record.h" |
| 40 | #include "record-full.h" |
| 41 | |
| 42 | #include "gdb_assert.h" |
| 43 | |
| 44 | #include "moxie-tdep.h" |
| 45 | |
| 46 | /* Local functions. */ |
| 47 | |
| 48 | extern void _initialize_moxie_tdep (void); |
| 49 | |
| 50 | /* Use an invalid address value as 'not available' marker. */ |
| 51 | enum { REG_UNAVAIL = (CORE_ADDR) -1 }; |
| 52 | |
| 53 | struct moxie_frame_cache |
| 54 | { |
| 55 | /* Base address. */ |
| 56 | CORE_ADDR base; |
| 57 | CORE_ADDR pc; |
| 58 | LONGEST framesize; |
| 59 | CORE_ADDR saved_regs[MOXIE_NUM_REGS]; |
| 60 | CORE_ADDR saved_sp; |
| 61 | }; |
| 62 | |
| 63 | /* Implement the "frame_align" gdbarch method. */ |
| 64 | |
| 65 | static CORE_ADDR |
| 66 | moxie_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) |
| 67 | { |
| 68 | /* Align to the size of an instruction (so that they can safely be |
| 69 | pushed onto the stack. */ |
| 70 | return sp & ~1; |
| 71 | } |
| 72 | |
| 73 | /* Implement the "breakpoint_from_pc" gdbarch method. */ |
| 74 | |
| 75 | const static unsigned char * |
| 76 | moxie_breakpoint_from_pc (struct gdbarch *gdbarch, |
| 77 | CORE_ADDR *pcptr, int *lenptr) |
| 78 | { |
| 79 | static unsigned char breakpoint[] = { 0x35, 0x00 }; |
| 80 | |
| 81 | *lenptr = sizeof (breakpoint); |
| 82 | return breakpoint; |
| 83 | } |
| 84 | |
| 85 | /* Moxie register names. */ |
| 86 | |
| 87 | char *moxie_register_names[] = { |
| 88 | "$fp", "$sp", "$r0", "$r1", "$r2", |
| 89 | "$r3", "$r4", "$r5", "$r6", "$r7", |
| 90 | "$r8", "$r9", "$r10", "$r11", "$r12", |
| 91 | "$r13", "$pc", "$cc" }; |
| 92 | |
| 93 | /* Implement the "register_name" gdbarch method. */ |
| 94 | |
| 95 | static const char * |
| 96 | moxie_register_name (struct gdbarch *gdbarch, int reg_nr) |
| 97 | { |
| 98 | if (reg_nr < 0) |
| 99 | return NULL; |
| 100 | if (reg_nr >= MOXIE_NUM_REGS) |
| 101 | return NULL; |
| 102 | return moxie_register_names[reg_nr]; |
| 103 | } |
| 104 | |
| 105 | /* Implement the "register_type" gdbarch method. */ |
| 106 | |
| 107 | static struct type * |
| 108 | moxie_register_type (struct gdbarch *gdbarch, int reg_nr) |
| 109 | { |
| 110 | if (reg_nr == MOXIE_PC_REGNUM) |
| 111 | return builtin_type (gdbarch)->builtin_func_ptr; |
| 112 | else if (reg_nr == MOXIE_SP_REGNUM || reg_nr == MOXIE_FP_REGNUM) |
| 113 | return builtin_type (gdbarch)->builtin_data_ptr; |
| 114 | else |
| 115 | return builtin_type (gdbarch)->builtin_int32; |
| 116 | } |
| 117 | |
| 118 | /* Write into appropriate registers a function return value |
| 119 | of type TYPE, given in virtual format. */ |
| 120 | |
| 121 | static void |
| 122 | moxie_store_return_value (struct type *type, struct regcache *regcache, |
| 123 | const void *valbuf) |
| 124 | { |
| 125 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 126 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 127 | CORE_ADDR regval; |
| 128 | int len = TYPE_LENGTH (type); |
| 129 | |
| 130 | /* Things always get returned in RET1_REGNUM, RET2_REGNUM. */ |
| 131 | regval = extract_unsigned_integer (valbuf, len > 4 ? 4 : len, byte_order); |
| 132 | regcache_cooked_write_unsigned (regcache, RET1_REGNUM, regval); |
| 133 | if (len > 4) |
| 134 | { |
| 135 | regval = extract_unsigned_integer ((gdb_byte *) valbuf + 4, |
| 136 | len - 4, byte_order); |
| 137 | regcache_cooked_write_unsigned (regcache, RET1_REGNUM + 1, regval); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | /* Decode the instructions within the given address range. Decide |
| 142 | when we must have reached the end of the function prologue. If a |
| 143 | frame_info pointer is provided, fill in its saved_regs etc. |
| 144 | |
| 145 | Returns the address of the first instruction after the prologue. */ |
| 146 | |
| 147 | static CORE_ADDR |
| 148 | moxie_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr, |
| 149 | struct moxie_frame_cache *cache, |
| 150 | struct gdbarch *gdbarch) |
| 151 | { |
| 152 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 153 | CORE_ADDR next_addr; |
| 154 | ULONGEST inst, inst2; |
| 155 | LONGEST offset; |
| 156 | int regnum; |
| 157 | |
| 158 | /* Record where the jsra instruction saves the PC and FP. */ |
| 159 | cache->saved_regs[MOXIE_PC_REGNUM] = -4; |
| 160 | cache->saved_regs[MOXIE_FP_REGNUM] = 0; |
| 161 | cache->framesize = 0; |
| 162 | |
| 163 | if (start_addr >= end_addr) |
| 164 | return end_addr; |
| 165 | |
| 166 | for (next_addr = start_addr; next_addr < end_addr; ) |
| 167 | { |
| 168 | inst = read_memory_unsigned_integer (next_addr, 2, byte_order); |
| 169 | |
| 170 | /* Match "push $sp $rN" where N is between 0 and 13 inclusive. */ |
| 171 | if (inst >= 0x0612 && inst <= 0x061f) |
| 172 | { |
| 173 | regnum = inst & 0x000f; |
| 174 | cache->framesize += 4; |
| 175 | cache->saved_regs[regnum] = cache->framesize; |
| 176 | next_addr += 2; |
| 177 | } |
| 178 | else |
| 179 | break; |
| 180 | } |
| 181 | |
| 182 | inst = read_memory_unsigned_integer (next_addr, 2, byte_order); |
| 183 | |
| 184 | /* Optional stack allocation for args and local vars <= 4 |
| 185 | byte. */ |
| 186 | if (inst == 0x01e0) /* ldi.l $r12, X */ |
| 187 | { |
| 188 | offset = read_memory_integer (next_addr + 2, 4, byte_order); |
| 189 | inst2 = read_memory_unsigned_integer (next_addr + 6, 2, byte_order); |
| 190 | |
| 191 | if (inst2 == 0x291e) /* sub.l $sp, $r12 */ |
| 192 | { |
| 193 | cache->framesize += offset; |
| 194 | } |
| 195 | |
| 196 | return (next_addr + 8); |
| 197 | } |
| 198 | else if ((inst & 0xff00) == 0x9100) /* dec $sp, X */ |
| 199 | { |
| 200 | cache->framesize += (inst & 0x00ff); |
| 201 | next_addr += 2; |
| 202 | |
| 203 | while (next_addr < end_addr) |
| 204 | { |
| 205 | inst = read_memory_unsigned_integer (next_addr, 2, byte_order); |
| 206 | if ((inst & 0xff00) != 0x9100) /* no more dec $sp, X */ |
| 207 | break; |
| 208 | cache->framesize += (inst & 0x00ff); |
| 209 | next_addr += 2; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | return next_addr; |
| 214 | } |
| 215 | |
| 216 | /* Find the end of function prologue. */ |
| 217 | |
| 218 | static CORE_ADDR |
| 219 | moxie_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 220 | { |
| 221 | CORE_ADDR func_addr = 0, func_end = 0; |
| 222 | const char *func_name; |
| 223 | |
| 224 | /* See if we can determine the end of the prologue via the symbol table. |
| 225 | If so, then return either PC, or the PC after the prologue, whichever |
| 226 | is greater. */ |
| 227 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) |
| 228 | { |
| 229 | CORE_ADDR post_prologue_pc |
| 230 | = skip_prologue_using_sal (gdbarch, func_addr); |
| 231 | if (post_prologue_pc != 0) |
| 232 | return max (pc, post_prologue_pc); |
| 233 | else |
| 234 | { |
| 235 | /* Can't determine prologue from the symbol table, need to examine |
| 236 | instructions. */ |
| 237 | struct symtab_and_line sal; |
| 238 | struct symbol *sym; |
| 239 | struct moxie_frame_cache cache; |
| 240 | CORE_ADDR plg_end; |
| 241 | |
| 242 | memset (&cache, 0, sizeof cache); |
| 243 | |
| 244 | plg_end = moxie_analyze_prologue (func_addr, |
| 245 | func_end, &cache, gdbarch); |
| 246 | /* Found a function. */ |
| 247 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL); |
| 248 | /* Don't use line number debug info for assembly source |
| 249 | files. */ |
| 250 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
| 251 | { |
| 252 | sal = find_pc_line (func_addr, 0); |
| 253 | if (sal.end && sal.end < func_end) |
| 254 | { |
| 255 | /* Found a line number, use it as end of |
| 256 | prologue. */ |
| 257 | return sal.end; |
| 258 | } |
| 259 | } |
| 260 | /* No useable line symbol. Use result of prologue parsing |
| 261 | method. */ |
| 262 | return plg_end; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | /* No function symbol -- just return the PC. */ |
| 267 | return (CORE_ADDR) pc; |
| 268 | } |
| 269 | |
| 270 | struct moxie_unwind_cache |
| 271 | { |
| 272 | /* The previous frame's inner most stack address. Used as this |
| 273 | frame ID's stack_addr. */ |
| 274 | CORE_ADDR prev_sp; |
| 275 | /* The frame's base, optionally used by the high-level debug info. */ |
| 276 | CORE_ADDR base; |
| 277 | int size; |
| 278 | /* How far the SP and r13 (FP) have been offset from the start of |
| 279 | the stack frame (as defined by the previous frame's stack |
| 280 | pointer). */ |
| 281 | LONGEST sp_offset; |
| 282 | LONGEST r13_offset; |
| 283 | int uses_frame; |
| 284 | /* Table indicating the location of each and every register. */ |
| 285 | struct trad_frame_saved_reg *saved_regs; |
| 286 | }; |
| 287 | |
| 288 | /* Implement the "read_pc" gdbarch method. */ |
| 289 | |
| 290 | static CORE_ADDR |
| 291 | moxie_read_pc (struct regcache *regcache) |
| 292 | { |
| 293 | ULONGEST pc; |
| 294 | |
| 295 | regcache_cooked_read_unsigned (regcache, MOXIE_PC_REGNUM, &pc); |
| 296 | return pc; |
| 297 | } |
| 298 | |
| 299 | /* Implement the "write_pc" gdbarch method. */ |
| 300 | |
| 301 | static void |
| 302 | moxie_write_pc (struct regcache *regcache, CORE_ADDR val) |
| 303 | { |
| 304 | regcache_cooked_write_unsigned (regcache, MOXIE_PC_REGNUM, val); |
| 305 | } |
| 306 | |
| 307 | /* Implement the "unwind_sp" gdbarch method. */ |
| 308 | |
| 309 | static CORE_ADDR |
| 310 | moxie_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 311 | { |
| 312 | return frame_unwind_register_unsigned (next_frame, MOXIE_SP_REGNUM); |
| 313 | } |
| 314 | |
| 315 | /* Given a return value in `regbuf' with a type `valtype', |
| 316 | extract and copy its value into `valbuf'. */ |
| 317 | |
| 318 | static void |
| 319 | moxie_extract_return_value (struct type *type, struct regcache *regcache, |
| 320 | void *dst) |
| 321 | { |
| 322 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 323 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 324 | bfd_byte *valbuf = dst; |
| 325 | int len = TYPE_LENGTH (type); |
| 326 | ULONGEST tmp; |
| 327 | |
| 328 | /* By using store_unsigned_integer we avoid having to do |
| 329 | anything special for small big-endian values. */ |
| 330 | regcache_cooked_read_unsigned (regcache, RET1_REGNUM, &tmp); |
| 331 | store_unsigned_integer (valbuf, (len > 4 ? len - 4 : len), byte_order, tmp); |
| 332 | |
| 333 | /* Ignore return values more than 8 bytes in size because the moxie |
| 334 | returns anything more than 8 bytes in the stack. */ |
| 335 | if (len > 4) |
| 336 | { |
| 337 | regcache_cooked_read_unsigned (regcache, RET1_REGNUM + 1, &tmp); |
| 338 | store_unsigned_integer (valbuf + len - 4, 4, byte_order, tmp); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | /* Implement the "return_value" gdbarch method. */ |
| 343 | |
| 344 | static enum return_value_convention |
| 345 | moxie_return_value (struct gdbarch *gdbarch, struct value *function, |
| 346 | struct type *valtype, struct regcache *regcache, |
| 347 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 348 | { |
| 349 | if (TYPE_LENGTH (valtype) > 8) |
| 350 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 351 | else |
| 352 | { |
| 353 | if (readbuf != NULL) |
| 354 | moxie_extract_return_value (valtype, regcache, readbuf); |
| 355 | if (writebuf != NULL) |
| 356 | moxie_store_return_value (valtype, regcache, writebuf); |
| 357 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | /* Allocate and initialize a moxie_frame_cache object. */ |
| 362 | |
| 363 | static struct moxie_frame_cache * |
| 364 | moxie_alloc_frame_cache (void) |
| 365 | { |
| 366 | struct moxie_frame_cache *cache; |
| 367 | int i; |
| 368 | |
| 369 | cache = FRAME_OBSTACK_ZALLOC (struct moxie_frame_cache); |
| 370 | |
| 371 | cache->base = 0; |
| 372 | cache->saved_sp = 0; |
| 373 | cache->pc = 0; |
| 374 | cache->framesize = 0; |
| 375 | for (i = 0; i < MOXIE_NUM_REGS; ++i) |
| 376 | cache->saved_regs[i] = REG_UNAVAIL; |
| 377 | |
| 378 | return cache; |
| 379 | } |
| 380 | |
| 381 | /* Populate a moxie_frame_cache object for this_frame. */ |
| 382 | |
| 383 | static struct moxie_frame_cache * |
| 384 | moxie_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 385 | { |
| 386 | struct moxie_frame_cache *cache; |
| 387 | CORE_ADDR current_pc; |
| 388 | int i; |
| 389 | |
| 390 | if (*this_cache) |
| 391 | return *this_cache; |
| 392 | |
| 393 | cache = moxie_alloc_frame_cache (); |
| 394 | *this_cache = cache; |
| 395 | |
| 396 | cache->base = get_frame_register_unsigned (this_frame, MOXIE_FP_REGNUM); |
| 397 | if (cache->base == 0) |
| 398 | return cache; |
| 399 | |
| 400 | cache->pc = get_frame_func (this_frame); |
| 401 | current_pc = get_frame_pc (this_frame); |
| 402 | if (cache->pc) |
| 403 | { |
| 404 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 405 | moxie_analyze_prologue (cache->pc, current_pc, cache, gdbarch); |
| 406 | } |
| 407 | |
| 408 | cache->saved_sp = cache->base - cache->framesize; |
| 409 | |
| 410 | for (i = 0; i < MOXIE_NUM_REGS; ++i) |
| 411 | if (cache->saved_regs[i] != REG_UNAVAIL) |
| 412 | cache->saved_regs[i] = cache->base - cache->saved_regs[i]; |
| 413 | |
| 414 | return cache; |
| 415 | } |
| 416 | |
| 417 | /* Implement the "unwind_pc" gdbarch method. */ |
| 418 | |
| 419 | static CORE_ADDR |
| 420 | moxie_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 421 | { |
| 422 | return frame_unwind_register_unsigned (next_frame, MOXIE_PC_REGNUM); |
| 423 | } |
| 424 | |
| 425 | /* Given a GDB frame, determine the address of the calling function's |
| 426 | frame. This will be used to create a new GDB frame struct. */ |
| 427 | |
| 428 | static void |
| 429 | moxie_frame_this_id (struct frame_info *this_frame, |
| 430 | void **this_prologue_cache, struct frame_id *this_id) |
| 431 | { |
| 432 | struct moxie_frame_cache *cache = moxie_frame_cache (this_frame, |
| 433 | this_prologue_cache); |
| 434 | |
| 435 | /* This marks the outermost frame. */ |
| 436 | if (cache->base == 0) |
| 437 | return; |
| 438 | |
| 439 | *this_id = frame_id_build (cache->saved_sp, cache->pc); |
| 440 | } |
| 441 | |
| 442 | /* Get the value of register regnum in the previous stack frame. */ |
| 443 | |
| 444 | static struct value * |
| 445 | moxie_frame_prev_register (struct frame_info *this_frame, |
| 446 | void **this_prologue_cache, int regnum) |
| 447 | { |
| 448 | struct moxie_frame_cache *cache = moxie_frame_cache (this_frame, |
| 449 | this_prologue_cache); |
| 450 | |
| 451 | gdb_assert (regnum >= 0); |
| 452 | |
| 453 | if (regnum == MOXIE_SP_REGNUM && cache->saved_sp) |
| 454 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
| 455 | |
| 456 | if (regnum < MOXIE_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) |
| 457 | return frame_unwind_got_memory (this_frame, regnum, |
| 458 | cache->saved_regs[regnum]); |
| 459 | |
| 460 | return frame_unwind_got_register (this_frame, regnum, regnum); |
| 461 | } |
| 462 | |
| 463 | static const struct frame_unwind moxie_frame_unwind = { |
| 464 | NORMAL_FRAME, |
| 465 | default_frame_unwind_stop_reason, |
| 466 | moxie_frame_this_id, |
| 467 | moxie_frame_prev_register, |
| 468 | NULL, |
| 469 | default_frame_sniffer |
| 470 | }; |
| 471 | |
| 472 | /* Return the base address of this_frame. */ |
| 473 | |
| 474 | static CORE_ADDR |
| 475 | moxie_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 476 | { |
| 477 | struct moxie_frame_cache *cache = moxie_frame_cache (this_frame, |
| 478 | this_cache); |
| 479 | |
| 480 | return cache->base; |
| 481 | } |
| 482 | |
| 483 | static const struct frame_base moxie_frame_base = { |
| 484 | &moxie_frame_unwind, |
| 485 | moxie_frame_base_address, |
| 486 | moxie_frame_base_address, |
| 487 | moxie_frame_base_address |
| 488 | }; |
| 489 | |
| 490 | static struct frame_id |
| 491 | moxie_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 492 | { |
| 493 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, MOXIE_SP_REGNUM); |
| 494 | |
| 495 | return frame_id_build (sp, get_frame_pc (this_frame)); |
| 496 | } |
| 497 | |
| 498 | /* Read an unsigned integer from the inferior, and adjust |
| 499 | endianess. */ |
| 500 | static ULONGEST |
| 501 | moxie_process_readu (CORE_ADDR addr, gdb_byte *buf, |
| 502 | int length, enum bfd_endian byte_order) |
| 503 | { |
| 504 | if (target_read_memory (addr, buf, length)) |
| 505 | { |
| 506 | if (record_debug) |
| 507 | printf_unfiltered (_("Process record: error reading memory at " |
| 508 | "addr 0x%s len = %d.\n"), |
| 509 | paddress (target_gdbarch (), addr), length); |
| 510 | return -1; |
| 511 | } |
| 512 | |
| 513 | return extract_unsigned_integer (buf, length, byte_order); |
| 514 | } |
| 515 | |
| 516 | /* Parse the current instruction and record the values of the registers and |
| 517 | memory that will be changed in current instruction to "record_arch_list". |
| 518 | Return -1 if something wrong. */ |
| 519 | |
| 520 | static int |
| 521 | moxie_process_record (struct gdbarch *gdbarch, struct regcache *regcache, |
| 522 | CORE_ADDR addr) |
| 523 | { |
| 524 | gdb_byte buf[4]; |
| 525 | uint16_t inst; |
| 526 | uint32_t tmpu32; |
| 527 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 528 | |
| 529 | if (record_debug > 1) |
| 530 | fprintf_unfiltered (gdb_stdlog, "Process record: moxie_process_record " |
| 531 | "addr = 0x%s\n", |
| 532 | paddress (target_gdbarch (), addr)); |
| 533 | |
| 534 | inst = (uint16_t) moxie_process_readu (addr, buf, 2, byte_order); |
| 535 | |
| 536 | /* Decode instruction. */ |
| 537 | if (inst & (1 << 15)) |
| 538 | { |
| 539 | if (inst & (1 << 14)) |
| 540 | { |
| 541 | /* This is a Form 3 instruction. */ |
| 542 | int opcode = (inst >> 10 & 0xf); |
| 543 | |
| 544 | switch (opcode) |
| 545 | { |
| 546 | case 0x00: /* beq */ |
| 547 | case 0x01: /* bne */ |
| 548 | case 0x02: /* blt */ |
| 549 | case 0x03: /* bgt */ |
| 550 | case 0x04: /* bltu */ |
| 551 | case 0x05: /* bgtu */ |
| 552 | case 0x06: /* bge */ |
| 553 | case 0x07: /* ble */ |
| 554 | case 0x08: /* bgeu */ |
| 555 | case 0x09: /* bleu */ |
| 556 | /* Do nothing. */ |
| 557 | break; |
| 558 | default: |
| 559 | { |
| 560 | /* Do nothing. */ |
| 561 | break; |
| 562 | } |
| 563 | } |
| 564 | } |
| 565 | else |
| 566 | { |
| 567 | /* This is a Form 2 instruction. */ |
| 568 | int opcode = (inst >> 12 & 0x3); |
| 569 | switch (opcode) |
| 570 | { |
| 571 | case 0x00: /* inc */ |
| 572 | case 0x01: /* dec */ |
| 573 | case 0x02: /* gsr */ |
| 574 | { |
| 575 | int reg = (inst >> 8) & 0xf; |
| 576 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 577 | return -1; |
| 578 | } |
| 579 | break; |
| 580 | case 0x03: /* ssr */ |
| 581 | { |
| 582 | /* Do nothing until GDB learns about moxie's special |
| 583 | registers. */ |
| 584 | } |
| 585 | break; |
| 586 | default: |
| 587 | /* Do nothing. */ |
| 588 | break; |
| 589 | } |
| 590 | } |
| 591 | } |
| 592 | else |
| 593 | { |
| 594 | /* This is a Form 1 instruction. */ |
| 595 | int opcode = inst >> 8; |
| 596 | |
| 597 | switch (opcode) |
| 598 | { |
| 599 | case 0x00: /* nop */ |
| 600 | /* Do nothing. */ |
| 601 | break; |
| 602 | case 0x01: /* ldi.l (immediate) */ |
| 603 | case 0x02: /* mov (register-to-register) */ |
| 604 | { |
| 605 | int reg = (inst >> 4) & 0xf; |
| 606 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 607 | return -1; |
| 608 | } |
| 609 | break; |
| 610 | case 0x03: /* jsra */ |
| 611 | { |
| 612 | regcache_raw_read (regcache, |
| 613 | MOXIE_SP_REGNUM, (gdb_byte *) & tmpu32); |
| 614 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 615 | 4, byte_order); |
| 616 | if (record_full_arch_list_add_reg (regcache, MOXIE_FP_REGNUM) |
| 617 | || (record_full_arch_list_add_reg (regcache, |
| 618 | MOXIE_SP_REGNUM)) |
| 619 | || record_full_arch_list_add_mem (tmpu32 - 12, 12)) |
| 620 | return -1; |
| 621 | } |
| 622 | break; |
| 623 | case 0x04: /* ret */ |
| 624 | { |
| 625 | if (record_full_arch_list_add_reg (regcache, MOXIE_FP_REGNUM) |
| 626 | || (record_full_arch_list_add_reg (regcache, |
| 627 | MOXIE_SP_REGNUM))) |
| 628 | return -1; |
| 629 | } |
| 630 | break; |
| 631 | case 0x05: /* add.l */ |
| 632 | { |
| 633 | int reg = (inst >> 4) & 0xf; |
| 634 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 635 | return -1; |
| 636 | } |
| 637 | break; |
| 638 | case 0x06: /* push */ |
| 639 | { |
| 640 | int reg = (inst >> 4) & 0xf; |
| 641 | regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); |
| 642 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 643 | 4, byte_order); |
| 644 | if (record_full_arch_list_add_reg (regcache, reg) |
| 645 | || record_full_arch_list_add_mem (tmpu32 - 4, 4)) |
| 646 | return -1; |
| 647 | } |
| 648 | break; |
| 649 | case 0x07: /* pop */ |
| 650 | { |
| 651 | int a = (inst >> 4) & 0xf; |
| 652 | int b = inst & 0xf; |
| 653 | if (record_full_arch_list_add_reg (regcache, a) |
| 654 | || record_full_arch_list_add_reg (regcache, b)) |
| 655 | return -1; |
| 656 | } |
| 657 | break; |
| 658 | case 0x08: /* lda.l */ |
| 659 | { |
| 660 | int reg = (inst >> 4) & 0xf; |
| 661 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 662 | return -1; |
| 663 | } |
| 664 | break; |
| 665 | case 0x09: /* sta.l */ |
| 666 | { |
| 667 | tmpu32 = (uint32_t) moxie_process_readu (addr+2, buf, |
| 668 | 4, byte_order); |
| 669 | if (record_full_arch_list_add_mem (tmpu32, 4)) |
| 670 | return -1; |
| 671 | } |
| 672 | break; |
| 673 | case 0x0a: /* ld.l (register indirect) */ |
| 674 | { |
| 675 | int reg = (inst >> 4) & 0xf; |
| 676 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 677 | return -1; |
| 678 | } |
| 679 | break; |
| 680 | case 0x0b: /* st.l */ |
| 681 | { |
| 682 | int reg = (inst >> 4) & 0xf; |
| 683 | regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); |
| 684 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 685 | 4, byte_order); |
| 686 | if (record_full_arch_list_add_mem (tmpu32, 4)) |
| 687 | return -1; |
| 688 | } |
| 689 | break; |
| 690 | case 0x0c: /* ldo.l */ |
| 691 | { |
| 692 | int reg = (inst >> 4) & 0xf; |
| 693 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 694 | return -1; |
| 695 | } |
| 696 | break; |
| 697 | case 0x0d: /* sto.l */ |
| 698 | { |
| 699 | int reg = (inst >> 4) & 0xf; |
| 700 | uint32_t offset = (uint32_t) moxie_process_readu (addr+2, buf, 4, |
| 701 | byte_order); |
| 702 | regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); |
| 703 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 704 | 4, byte_order); |
| 705 | tmpu32 += offset; |
| 706 | if (record_full_arch_list_add_mem (tmpu32, 4)) |
| 707 | return -1; |
| 708 | } |
| 709 | break; |
| 710 | case 0x0e: /* cmp */ |
| 711 | { |
| 712 | if (record_full_arch_list_add_reg (regcache, MOXIE_CC_REGNUM)) |
| 713 | return -1; |
| 714 | } |
| 715 | break; |
| 716 | case 0x0f: |
| 717 | case 0x10: |
| 718 | case 0x11: |
| 719 | case 0x12: |
| 720 | case 0x13: |
| 721 | case 0x14: |
| 722 | case 0x15: |
| 723 | case 0x16: |
| 724 | case 0x17: |
| 725 | case 0x18: |
| 726 | { |
| 727 | /* Do nothing. */ |
| 728 | break; |
| 729 | } |
| 730 | case 0x19: /* jsr */ |
| 731 | { |
| 732 | regcache_raw_read (regcache, |
| 733 | MOXIE_SP_REGNUM, (gdb_byte *) & tmpu32); |
| 734 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 735 | 4, byte_order); |
| 736 | if (record_full_arch_list_add_reg (regcache, MOXIE_FP_REGNUM) |
| 737 | || (record_full_arch_list_add_reg (regcache, |
| 738 | MOXIE_SP_REGNUM)) |
| 739 | || record_full_arch_list_add_mem (tmpu32 - 12, 12)) |
| 740 | return -1; |
| 741 | } |
| 742 | break; |
| 743 | case 0x1a: /* jmpa */ |
| 744 | { |
| 745 | /* Do nothing. */ |
| 746 | } |
| 747 | break; |
| 748 | case 0x1b: /* ldi.b (immediate) */ |
| 749 | case 0x1c: /* ld.b (register indirect) */ |
| 750 | case 0x1d: /* lda.b */ |
| 751 | { |
| 752 | int reg = (inst >> 4) & 0xf; |
| 753 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 754 | return -1; |
| 755 | } |
| 756 | break; |
| 757 | case 0x1e: /* st.b */ |
| 758 | { |
| 759 | int reg = (inst >> 4) & 0xf; |
| 760 | regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); |
| 761 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 762 | 4, byte_order); |
| 763 | if (record_full_arch_list_add_mem (tmpu32, 1)) |
| 764 | return -1; |
| 765 | } |
| 766 | break; |
| 767 | case 0x1f: /* sta.b */ |
| 768 | { |
| 769 | tmpu32 = moxie_process_readu (addr+2, buf, 4, byte_order); |
| 770 | if (record_full_arch_list_add_mem (tmpu32, 1)) |
| 771 | return -1; |
| 772 | } |
| 773 | break; |
| 774 | case 0x20: /* ldi.s (immediate) */ |
| 775 | case 0x21: /* ld.s (register indirect) */ |
| 776 | case 0x22: /* lda.s */ |
| 777 | { |
| 778 | int reg = (inst >> 4) & 0xf; |
| 779 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 780 | return -1; |
| 781 | } |
| 782 | break; |
| 783 | case 0x23: /* st.s */ |
| 784 | { |
| 785 | int reg = (inst >> 4) & 0xf; |
| 786 | regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); |
| 787 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 788 | 4, byte_order); |
| 789 | if (record_full_arch_list_add_mem (tmpu32, 2)) |
| 790 | return -1; |
| 791 | } |
| 792 | break; |
| 793 | case 0x24: /* sta.s */ |
| 794 | { |
| 795 | tmpu32 = moxie_process_readu (addr+2, buf, 4, byte_order); |
| 796 | if (record_full_arch_list_add_mem (tmpu32, 2)) |
| 797 | return -1; |
| 798 | } |
| 799 | break; |
| 800 | case 0x25: /* jmp */ |
| 801 | { |
| 802 | /* Do nothing. */ |
| 803 | } |
| 804 | break; |
| 805 | case 0x26: /* and */ |
| 806 | case 0x27: /* lshr */ |
| 807 | case 0x28: /* ashl */ |
| 808 | case 0x29: /* sub.l */ |
| 809 | case 0x2a: /* neg */ |
| 810 | case 0x2b: /* or */ |
| 811 | case 0x2c: /* not */ |
| 812 | case 0x2d: /* ashr */ |
| 813 | case 0x2e: /* xor */ |
| 814 | case 0x2f: /* mul.l */ |
| 815 | { |
| 816 | int reg = (inst >> 4) & 0xf; |
| 817 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 818 | return -1; |
| 819 | } |
| 820 | break; |
| 821 | case 0x30: /* swi */ |
| 822 | { |
| 823 | /* We currently implement support for libgloss' |
| 824 | system calls. */ |
| 825 | |
| 826 | int inum = moxie_process_readu (addr+2, buf, 4, byte_order); |
| 827 | |
| 828 | switch (inum) |
| 829 | { |
| 830 | case 0x1: /* SYS_exit */ |
| 831 | { |
| 832 | /* Do nothing. */ |
| 833 | } |
| 834 | break; |
| 835 | case 0x2: /* SYS_open */ |
| 836 | { |
| 837 | if (record_full_arch_list_add_reg (regcache, RET1_REGNUM)) |
| 838 | return -1; |
| 839 | } |
| 840 | break; |
| 841 | case 0x4: /* SYS_read */ |
| 842 | { |
| 843 | uint32_t length, ptr; |
| 844 | |
| 845 | /* Read buffer pointer is in $r1. */ |
| 846 | regcache_raw_read (regcache, 3, (gdb_byte *) & ptr); |
| 847 | ptr = extract_unsigned_integer ((gdb_byte *) & ptr, |
| 848 | 4, byte_order); |
| 849 | |
| 850 | /* String length is at 0x12($fp). */ |
| 851 | regcache_raw_read (regcache, |
| 852 | MOXIE_FP_REGNUM, (gdb_byte *) & tmpu32); |
| 853 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 854 | 4, byte_order); |
| 855 | length = moxie_process_readu (tmpu32+20, buf, 4, byte_order); |
| 856 | |
| 857 | if (record_full_arch_list_add_mem (ptr, length)) |
| 858 | return -1; |
| 859 | } |
| 860 | break; |
| 861 | case 0x5: /* SYS_write */ |
| 862 | { |
| 863 | if (record_full_arch_list_add_reg (regcache, RET1_REGNUM)) |
| 864 | return -1; |
| 865 | } |
| 866 | break; |
| 867 | default: |
| 868 | break; |
| 869 | } |
| 870 | } |
| 871 | break; |
| 872 | case 0x31: /* div.l */ |
| 873 | case 0x32: /* udiv.l */ |
| 874 | case 0x33: /* mod.l */ |
| 875 | case 0x34: /* umod.l */ |
| 876 | { |
| 877 | int reg = (inst >> 4) & 0xf; |
| 878 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 879 | return -1; |
| 880 | } |
| 881 | break; |
| 882 | case 0x35: /* brk */ |
| 883 | /* Do nothing. */ |
| 884 | break; |
| 885 | case 0x36: /* ldo.b */ |
| 886 | { |
| 887 | int reg = (inst >> 4) & 0xf; |
| 888 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 889 | return -1; |
| 890 | } |
| 891 | break; |
| 892 | case 0x37: /* sto.b */ |
| 893 | { |
| 894 | int reg = (inst >> 4) & 0xf; |
| 895 | uint32_t offset = (uint32_t) moxie_process_readu (addr+2, buf, 4, |
| 896 | byte_order); |
| 897 | regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); |
| 898 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 899 | 4, byte_order); |
| 900 | tmpu32 += offset; |
| 901 | if (record_full_arch_list_add_mem (tmpu32, 1)) |
| 902 | return -1; |
| 903 | } |
| 904 | break; |
| 905 | case 0x38: /* ldo.s */ |
| 906 | { |
| 907 | int reg = (inst >> 4) & 0xf; |
| 908 | if (record_full_arch_list_add_reg (regcache, reg)) |
| 909 | return -1; |
| 910 | } |
| 911 | break; |
| 912 | case 0x39: /* sto.s */ |
| 913 | { |
| 914 | int reg = (inst >> 4) & 0xf; |
| 915 | uint32_t offset = (uint32_t) moxie_process_readu (addr+2, buf, 4, |
| 916 | byte_order); |
| 917 | regcache_raw_read (regcache, reg, (gdb_byte *) & tmpu32); |
| 918 | tmpu32 = extract_unsigned_integer ((gdb_byte *) & tmpu32, |
| 919 | 4, byte_order); |
| 920 | tmpu32 += offset; |
| 921 | if (record_full_arch_list_add_mem (tmpu32, 2)) |
| 922 | return -1; |
| 923 | } |
| 924 | break; |
| 925 | default: |
| 926 | /* Do nothing. */ |
| 927 | break; |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | if (record_full_arch_list_add_reg (regcache, MOXIE_PC_REGNUM)) |
| 932 | return -1; |
| 933 | if (record_full_arch_list_add_end ()) |
| 934 | return -1; |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | /* Allocate and initialize the moxie gdbarch object. */ |
| 939 | |
| 940 | static struct gdbarch * |
| 941 | moxie_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 942 | { |
| 943 | struct gdbarch *gdbarch; |
| 944 | struct gdbarch_tdep *tdep; |
| 945 | |
| 946 | /* If there is already a candidate, use it. */ |
| 947 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 948 | if (arches != NULL) |
| 949 | return arches->gdbarch; |
| 950 | |
| 951 | /* Allocate space for the new architecture. */ |
| 952 | tdep = XMALLOC (struct gdbarch_tdep); |
| 953 | gdbarch = gdbarch_alloc (&info, tdep); |
| 954 | |
| 955 | set_gdbarch_read_pc (gdbarch, moxie_read_pc); |
| 956 | set_gdbarch_write_pc (gdbarch, moxie_write_pc); |
| 957 | set_gdbarch_unwind_sp (gdbarch, moxie_unwind_sp); |
| 958 | |
| 959 | set_gdbarch_num_regs (gdbarch, MOXIE_NUM_REGS); |
| 960 | set_gdbarch_sp_regnum (gdbarch, MOXIE_SP_REGNUM); |
| 961 | set_gdbarch_pc_regnum (gdbarch, MOXIE_PC_REGNUM); |
| 962 | set_gdbarch_register_name (gdbarch, moxie_register_name); |
| 963 | set_gdbarch_register_type (gdbarch, moxie_register_type); |
| 964 | |
| 965 | set_gdbarch_return_value (gdbarch, moxie_return_value); |
| 966 | |
| 967 | set_gdbarch_skip_prologue (gdbarch, moxie_skip_prologue); |
| 968 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 969 | set_gdbarch_breakpoint_from_pc (gdbarch, moxie_breakpoint_from_pc); |
| 970 | set_gdbarch_frame_align (gdbarch, moxie_frame_align); |
| 971 | |
| 972 | frame_base_set_default (gdbarch, &moxie_frame_base); |
| 973 | |
| 974 | /* Methods for saving / extracting a dummy frame's ID. The ID's |
| 975 | stack address must match the SP value returned by |
| 976 | PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */ |
| 977 | set_gdbarch_dummy_id (gdbarch, moxie_dummy_id); |
| 978 | |
| 979 | set_gdbarch_unwind_pc (gdbarch, moxie_unwind_pc); |
| 980 | |
| 981 | set_gdbarch_print_insn (gdbarch, print_insn_moxie); |
| 982 | |
| 983 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 984 | gdbarch_init_osabi (info, gdbarch); |
| 985 | |
| 986 | /* Hook in the default unwinders. */ |
| 987 | frame_unwind_append_unwinder (gdbarch, &moxie_frame_unwind); |
| 988 | |
| 989 | /* Support simple overlay manager. */ |
| 990 | set_gdbarch_overlay_update (gdbarch, simple_overlay_update); |
| 991 | |
| 992 | /* Support reverse debugging. */ |
| 993 | set_gdbarch_process_record (gdbarch, moxie_process_record); |
| 994 | |
| 995 | return gdbarch; |
| 996 | } |
| 997 | |
| 998 | /* Register this machine's init routine. */ |
| 999 | |
| 1000 | void |
| 1001 | _initialize_moxie_tdep (void) |
| 1002 | { |
| 1003 | register_gdbarch_init (bfd_arch_moxie, moxie_gdbarch_init); |
| 1004 | } |