| 1 | /* Target-dependent code for FT32. |
| 2 | |
| 3 | Copyright (C) 2009-2016 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 "value.h" |
| 29 | #include "inferior.h" |
| 30 | #include "symfile.h" |
| 31 | #include "objfiles.h" |
| 32 | #include "osabi.h" |
| 33 | #include "language.h" |
| 34 | #include "arch-utils.h" |
| 35 | #include "regcache.h" |
| 36 | #include "trad-frame.h" |
| 37 | #include "dis-asm.h" |
| 38 | #include "record.h" |
| 39 | |
| 40 | #include "opcode/ft32.h" |
| 41 | |
| 42 | #include "ft32-tdep.h" |
| 43 | #include "gdb/sim-ft32.h" |
| 44 | |
| 45 | #define RAM_BIAS 0x800000 /* Bias added to RAM addresses. */ |
| 46 | |
| 47 | /* Local functions. */ |
| 48 | |
| 49 | extern void _initialize_ft32_tdep (void); |
| 50 | |
| 51 | /* Use an invalid address -1 as 'not available' marker. */ |
| 52 | enum { REG_UNAVAIL = (CORE_ADDR) (-1) }; |
| 53 | |
| 54 | struct ft32_frame_cache |
| 55 | { |
| 56 | /* Base address of the frame */ |
| 57 | CORE_ADDR base; |
| 58 | /* Function this frame belongs to */ |
| 59 | CORE_ADDR pc; |
| 60 | /* Total size of this frame */ |
| 61 | LONGEST framesize; |
| 62 | /* Saved registers in this frame */ |
| 63 | CORE_ADDR saved_regs[FT32_NUM_REGS]; |
| 64 | /* Saved SP in this frame */ |
| 65 | CORE_ADDR saved_sp; |
| 66 | /* Has the new frame been LINKed. */ |
| 67 | bfd_boolean established; |
| 68 | }; |
| 69 | |
| 70 | /* Implement the "frame_align" gdbarch method. */ |
| 71 | |
| 72 | static CORE_ADDR |
| 73 | ft32_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) |
| 74 | { |
| 75 | /* Align to the size of an instruction (so that they can safely be |
| 76 | pushed onto the stack. */ |
| 77 | return sp & ~1; |
| 78 | } |
| 79 | |
| 80 | /* Implement the "breakpoint_from_pc" gdbarch method. */ |
| 81 | |
| 82 | static const unsigned char * |
| 83 | ft32_breakpoint_from_pc (struct gdbarch *gdbarch, |
| 84 | CORE_ADDR *pcptr, int *lenptr) |
| 85 | { |
| 86 | static const gdb_byte breakpoint[] = { 0x02, 0x00, 0x34, 0x00 }; |
| 87 | |
| 88 | *lenptr = sizeof (breakpoint); |
| 89 | return breakpoint; |
| 90 | } |
| 91 | |
| 92 | /* FT32 register names. */ |
| 93 | |
| 94 | static const char *const ft32_register_names[] = |
| 95 | { |
| 96 | "fp", "sp", |
| 97 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 98 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 99 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 100 | "r24", "r25", "r26", "r27", "r28", "cc", |
| 101 | "pc" |
| 102 | }; |
| 103 | |
| 104 | /* Implement the "register_name" gdbarch method. */ |
| 105 | |
| 106 | static const char * |
| 107 | ft32_register_name (struct gdbarch *gdbarch, int reg_nr) |
| 108 | { |
| 109 | if (reg_nr < 0) |
| 110 | return NULL; |
| 111 | if (reg_nr >= FT32_NUM_REGS) |
| 112 | return NULL; |
| 113 | return ft32_register_names[reg_nr]; |
| 114 | } |
| 115 | |
| 116 | /* Implement the "register_type" gdbarch method. */ |
| 117 | |
| 118 | static struct type * |
| 119 | ft32_register_type (struct gdbarch *gdbarch, int reg_nr) |
| 120 | { |
| 121 | if (reg_nr == FT32_PC_REGNUM) |
| 122 | return gdbarch_tdep (gdbarch)->pc_type; |
| 123 | else if (reg_nr == FT32_SP_REGNUM || reg_nr == FT32_FP_REGNUM) |
| 124 | return builtin_type (gdbarch)->builtin_data_ptr; |
| 125 | else |
| 126 | return builtin_type (gdbarch)->builtin_int32; |
| 127 | } |
| 128 | |
| 129 | /* Write into appropriate registers a function return value |
| 130 | of type TYPE, given in virtual format. */ |
| 131 | |
| 132 | static void |
| 133 | ft32_store_return_value (struct type *type, struct regcache *regcache, |
| 134 | const gdb_byte *valbuf) |
| 135 | { |
| 136 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 137 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 138 | CORE_ADDR regval; |
| 139 | int len = TYPE_LENGTH (type); |
| 140 | |
| 141 | /* Things always get returned in RET1_REGNUM, RET2_REGNUM. */ |
| 142 | regval = extract_unsigned_integer (valbuf, len > 4 ? 4 : len, byte_order); |
| 143 | regcache_cooked_write_unsigned (regcache, FT32_R0_REGNUM, regval); |
| 144 | if (len > 4) |
| 145 | { |
| 146 | regval = extract_unsigned_integer (valbuf + 4, |
| 147 | len - 4, byte_order); |
| 148 | regcache_cooked_write_unsigned (regcache, FT32_R1_REGNUM, regval); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /* Decode the instructions within the given address range. Decide |
| 153 | when we must have reached the end of the function prologue. If a |
| 154 | frame_info pointer is provided, fill in its saved_regs etc. |
| 155 | |
| 156 | Returns the address of the first instruction after the prologue. */ |
| 157 | |
| 158 | static CORE_ADDR |
| 159 | ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr, |
| 160 | struct ft32_frame_cache *cache, |
| 161 | struct gdbarch *gdbarch) |
| 162 | { |
| 163 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 164 | CORE_ADDR next_addr; |
| 165 | ULONGEST inst, inst2; |
| 166 | LONGEST offset; |
| 167 | int regnum, pushreg; |
| 168 | struct bound_minimal_symbol msymbol; |
| 169 | const int first_saved_reg = 13; /* The first saved register. */ |
| 170 | /* PROLOGS are addresses of the subroutine prologs, PROLOGS[n] |
| 171 | is the address of __prolog_$rN. |
| 172 | __prolog_$rN pushes registers from 13 through n inclusive. |
| 173 | So for example CALL __prolog_$r15 is equivalent to: |
| 174 | PUSH $r13 |
| 175 | PUSH $r14 |
| 176 | PUSH $r15 |
| 177 | Note that PROLOGS[0] through PROLOGS[12] are unused. */ |
| 178 | CORE_ADDR prologs[32]; |
| 179 | |
| 180 | cache->saved_regs[FT32_PC_REGNUM] = 0; |
| 181 | cache->framesize = 0; |
| 182 | |
| 183 | for (regnum = first_saved_reg; regnum < 32; regnum++) |
| 184 | { |
| 185 | char prolog_symbol[32]; |
| 186 | |
| 187 | snprintf (prolog_symbol, sizeof (prolog_symbol), "__prolog_$r%02d", |
| 188 | regnum); |
| 189 | msymbol = lookup_minimal_symbol (prolog_symbol, NULL, NULL); |
| 190 | if (msymbol.minsym) |
| 191 | prologs[regnum] = BMSYMBOL_VALUE_ADDRESS (msymbol); |
| 192 | else |
| 193 | prologs[regnum] = 0; |
| 194 | } |
| 195 | |
| 196 | if (start_addr >= end_addr) |
| 197 | return end_addr; |
| 198 | |
| 199 | cache->established = 0; |
| 200 | for (next_addr = start_addr; next_addr < end_addr;) |
| 201 | { |
| 202 | inst = read_memory_unsigned_integer (next_addr, 4, byte_order); |
| 203 | |
| 204 | if (FT32_IS_PUSH (inst)) |
| 205 | { |
| 206 | pushreg = FT32_PUSH_REG (inst); |
| 207 | cache->framesize += 4; |
| 208 | cache->saved_regs[FT32_R0_REGNUM + pushreg] = cache->framesize; |
| 209 | next_addr += 4; |
| 210 | } |
| 211 | else if (FT32_IS_CALL (inst)) |
| 212 | { |
| 213 | for (regnum = first_saved_reg; regnum < 32; regnum++) |
| 214 | { |
| 215 | if ((4 * (inst & 0x3ffff)) == prologs[regnum]) |
| 216 | { |
| 217 | for (pushreg = first_saved_reg; pushreg <= regnum; |
| 218 | pushreg++) |
| 219 | { |
| 220 | cache->framesize += 4; |
| 221 | cache->saved_regs[FT32_R0_REGNUM + pushreg] = |
| 222 | cache->framesize; |
| 223 | } |
| 224 | next_addr += 4; |
| 225 | } |
| 226 | } |
| 227 | break; |
| 228 | } |
| 229 | else |
| 230 | break; |
| 231 | } |
| 232 | for (regnum = FT32_R0_REGNUM; regnum < FT32_PC_REGNUM; regnum++) |
| 233 | { |
| 234 | if (cache->saved_regs[regnum] != REG_UNAVAIL) |
| 235 | cache->saved_regs[regnum] = |
| 236 | cache->framesize - cache->saved_regs[regnum]; |
| 237 | } |
| 238 | cache->saved_regs[FT32_PC_REGNUM] = cache->framesize; |
| 239 | |
| 240 | /* It is a LINK? */ |
| 241 | if (next_addr < end_addr) |
| 242 | { |
| 243 | inst = read_memory_unsigned_integer (next_addr, 4, byte_order); |
| 244 | if (FT32_IS_LINK (inst)) |
| 245 | { |
| 246 | cache->established = 1; |
| 247 | for (regnum = FT32_R0_REGNUM; regnum < FT32_PC_REGNUM; regnum++) |
| 248 | { |
| 249 | if (cache->saved_regs[regnum] != REG_UNAVAIL) |
| 250 | cache->saved_regs[regnum] += 4; |
| 251 | } |
| 252 | cache->saved_regs[FT32_PC_REGNUM] = cache->framesize + 4; |
| 253 | cache->saved_regs[FT32_FP_REGNUM] = 0; |
| 254 | cache->framesize += FT32_LINK_SIZE (inst); |
| 255 | next_addr += 4; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | return next_addr; |
| 260 | } |
| 261 | |
| 262 | /* Find the end of function prologue. */ |
| 263 | |
| 264 | static CORE_ADDR |
| 265 | ft32_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 266 | { |
| 267 | CORE_ADDR func_addr = 0, func_end = 0; |
| 268 | const char *func_name; |
| 269 | |
| 270 | /* See if we can determine the end of the prologue via the symbol table. |
| 271 | If so, then return either PC, or the PC after the prologue, whichever |
| 272 | is greater. */ |
| 273 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) |
| 274 | { |
| 275 | CORE_ADDR post_prologue_pc |
| 276 | = skip_prologue_using_sal (gdbarch, func_addr); |
| 277 | if (post_prologue_pc != 0) |
| 278 | return max (pc, post_prologue_pc); |
| 279 | else |
| 280 | { |
| 281 | /* Can't determine prologue from the symbol table, need to examine |
| 282 | instructions. */ |
| 283 | struct symtab_and_line sal; |
| 284 | struct symbol *sym; |
| 285 | struct ft32_frame_cache cache; |
| 286 | CORE_ADDR plg_end; |
| 287 | |
| 288 | memset (&cache, 0, sizeof cache); |
| 289 | |
| 290 | plg_end = ft32_analyze_prologue (func_addr, |
| 291 | func_end, &cache, gdbarch); |
| 292 | /* Found a function. */ |
| 293 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL).symbol; |
| 294 | /* Don't use line number debug info for assembly source files. */ |
| 295 | if ((sym != NULL) && SYMBOL_LANGUAGE (sym) != language_asm) |
| 296 | { |
| 297 | sal = find_pc_line (func_addr, 0); |
| 298 | if (sal.end && sal.end < func_end) |
| 299 | { |
| 300 | /* Found a line number, use it as end of prologue. */ |
| 301 | return sal.end; |
| 302 | } |
| 303 | } |
| 304 | /* No useable line symbol. Use result of prologue parsing method. */ |
| 305 | return plg_end; |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | /* No function symbol -- just return the PC. */ |
| 310 | return pc; |
| 311 | } |
| 312 | |
| 313 | /* Implementation of `pointer_to_address' gdbarch method. |
| 314 | |
| 315 | On FT32 address space zero is RAM, address space 1 is flash. |
| 316 | RAM appears at address RAM_BIAS, flash at address 0. */ |
| 317 | |
| 318 | static CORE_ADDR |
| 319 | ft32_pointer_to_address (struct gdbarch *gdbarch, |
| 320 | struct type *type, const gdb_byte *buf) |
| 321 | { |
| 322 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 323 | CORE_ADDR addr |
| 324 | = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order); |
| 325 | |
| 326 | if (TYPE_ADDRESS_CLASS_1 (type)) |
| 327 | return addr; |
| 328 | else |
| 329 | return addr | RAM_BIAS; |
| 330 | } |
| 331 | |
| 332 | /* Implementation of `address_class_type_flags' gdbarch method. |
| 333 | |
| 334 | This method maps DW_AT_address_class attributes to a |
| 335 | type_instance_flag_value. */ |
| 336 | |
| 337 | static int |
| 338 | ft32_address_class_type_flags (int byte_size, int dwarf2_addr_class) |
| 339 | { |
| 340 | /* The value 1 of the DW_AT_address_class attribute corresponds to the |
| 341 | __flash__ qualifier, meaning pointer to data in FT32 program memory. |
| 342 | */ |
| 343 | if (dwarf2_addr_class == 1) |
| 344 | return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1; |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | /* Implementation of `address_class_type_flags_to_name' gdbarch method. |
| 349 | |
| 350 | Convert a type_instance_flag_value to an address space qualifier. */ |
| 351 | |
| 352 | static const char* |
| 353 | ft32_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags) |
| 354 | { |
| 355 | if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1) |
| 356 | return "flash"; |
| 357 | else |
| 358 | return NULL; |
| 359 | } |
| 360 | |
| 361 | /* Implementation of `address_class_name_to_type_flags' gdbarch method. |
| 362 | |
| 363 | Convert an address space qualifier to a type_instance_flag_value. */ |
| 364 | |
| 365 | static int |
| 366 | ft32_address_class_name_to_type_flags (struct gdbarch *gdbarch, |
| 367 | const char* name, |
| 368 | int *type_flags_ptr) |
| 369 | { |
| 370 | if (strcmp (name, "flash") == 0) |
| 371 | { |
| 372 | *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1; |
| 373 | return 1; |
| 374 | } |
| 375 | else |
| 376 | return 0; |
| 377 | } |
| 378 | |
| 379 | |
| 380 | /* Implement the "read_pc" gdbarch method. */ |
| 381 | |
| 382 | static CORE_ADDR |
| 383 | ft32_read_pc (struct regcache *regcache) |
| 384 | { |
| 385 | ULONGEST pc; |
| 386 | |
| 387 | regcache_cooked_read_unsigned (regcache, FT32_PC_REGNUM, &pc); |
| 388 | return pc; |
| 389 | } |
| 390 | |
| 391 | /* Implement the "write_pc" gdbarch method. */ |
| 392 | |
| 393 | static void |
| 394 | ft32_write_pc (struct regcache *regcache, CORE_ADDR val) |
| 395 | { |
| 396 | regcache_cooked_write_unsigned (regcache, FT32_PC_REGNUM, val); |
| 397 | } |
| 398 | |
| 399 | /* Implement the "unwind_sp" gdbarch method. */ |
| 400 | |
| 401 | static CORE_ADDR |
| 402 | ft32_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 403 | { |
| 404 | return frame_unwind_register_unsigned (next_frame, FT32_SP_REGNUM); |
| 405 | } |
| 406 | |
| 407 | /* Given a return value in `regbuf' with a type `valtype', |
| 408 | extract and copy its value into `valbuf'. */ |
| 409 | |
| 410 | static void |
| 411 | ft32_extract_return_value (struct type *type, struct regcache *regcache, |
| 412 | gdb_byte *dst) |
| 413 | { |
| 414 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 415 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 416 | bfd_byte *valbuf = dst; |
| 417 | int len = TYPE_LENGTH (type); |
| 418 | ULONGEST tmp; |
| 419 | |
| 420 | /* By using store_unsigned_integer we avoid having to do |
| 421 | anything special for small big-endian values. */ |
| 422 | regcache_cooked_read_unsigned (regcache, FT32_R0_REGNUM, &tmp); |
| 423 | store_unsigned_integer (valbuf, (len > 4 ? len - 4 : len), byte_order, tmp); |
| 424 | |
| 425 | /* Ignore return values more than 8 bytes in size because the ft32 |
| 426 | returns anything more than 8 bytes in the stack. */ |
| 427 | if (len > 4) |
| 428 | { |
| 429 | regcache_cooked_read_unsigned (regcache, FT32_R1_REGNUM, &tmp); |
| 430 | store_unsigned_integer (valbuf + len - 4, 4, byte_order, tmp); |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | /* Implement the "return_value" gdbarch method. */ |
| 435 | |
| 436 | static enum return_value_convention |
| 437 | ft32_return_value (struct gdbarch *gdbarch, struct value *function, |
| 438 | struct type *valtype, struct regcache *regcache, |
| 439 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 440 | { |
| 441 | if (TYPE_LENGTH (valtype) > 8) |
| 442 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 443 | else |
| 444 | { |
| 445 | if (readbuf != NULL) |
| 446 | ft32_extract_return_value (valtype, regcache, readbuf); |
| 447 | if (writebuf != NULL) |
| 448 | ft32_store_return_value (valtype, regcache, writebuf); |
| 449 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* Allocate and initialize a ft32_frame_cache object. */ |
| 454 | |
| 455 | static struct ft32_frame_cache * |
| 456 | ft32_alloc_frame_cache (void) |
| 457 | { |
| 458 | struct ft32_frame_cache *cache; |
| 459 | int i; |
| 460 | |
| 461 | cache = FRAME_OBSTACK_ZALLOC (struct ft32_frame_cache); |
| 462 | |
| 463 | for (i = 0; i < FT32_NUM_REGS; ++i) |
| 464 | cache->saved_regs[i] = REG_UNAVAIL; |
| 465 | |
| 466 | return cache; |
| 467 | } |
| 468 | |
| 469 | /* Populate a ft32_frame_cache object for this_frame. */ |
| 470 | |
| 471 | static struct ft32_frame_cache * |
| 472 | ft32_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 473 | { |
| 474 | struct ft32_frame_cache *cache; |
| 475 | CORE_ADDR current_pc; |
| 476 | int i; |
| 477 | |
| 478 | if (*this_cache) |
| 479 | return (struct ft32_frame_cache *) *this_cache; |
| 480 | |
| 481 | cache = ft32_alloc_frame_cache (); |
| 482 | *this_cache = cache; |
| 483 | |
| 484 | cache->base = get_frame_register_unsigned (this_frame, FT32_FP_REGNUM); |
| 485 | if (cache->base == 0) |
| 486 | return cache; |
| 487 | |
| 488 | cache->pc = get_frame_func (this_frame); |
| 489 | current_pc = get_frame_pc (this_frame); |
| 490 | if (cache->pc) |
| 491 | { |
| 492 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 493 | |
| 494 | ft32_analyze_prologue (cache->pc, current_pc, cache, gdbarch); |
| 495 | if (!cache->established) |
| 496 | cache->base = get_frame_register_unsigned (this_frame, FT32_SP_REGNUM); |
| 497 | } |
| 498 | |
| 499 | cache->saved_sp = cache->base - 4; |
| 500 | |
| 501 | for (i = 0; i < FT32_NUM_REGS; ++i) |
| 502 | if (cache->saved_regs[i] != REG_UNAVAIL) |
| 503 | cache->saved_regs[i] = cache->base + cache->saved_regs[i]; |
| 504 | |
| 505 | return cache; |
| 506 | } |
| 507 | |
| 508 | /* Implement the "unwind_pc" gdbarch method. */ |
| 509 | |
| 510 | static CORE_ADDR |
| 511 | ft32_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 512 | { |
| 513 | return frame_unwind_register_unsigned (next_frame, FT32_PC_REGNUM); |
| 514 | } |
| 515 | |
| 516 | /* Given a GDB frame, determine the address of the calling function's |
| 517 | frame. This will be used to create a new GDB frame struct. */ |
| 518 | |
| 519 | static void |
| 520 | ft32_frame_this_id (struct frame_info *this_frame, |
| 521 | void **this_prologue_cache, struct frame_id *this_id) |
| 522 | { |
| 523 | struct ft32_frame_cache *cache = ft32_frame_cache (this_frame, |
| 524 | this_prologue_cache); |
| 525 | |
| 526 | /* This marks the outermost frame. */ |
| 527 | if (cache->base == 0) |
| 528 | return; |
| 529 | |
| 530 | *this_id = frame_id_build (cache->saved_sp, cache->pc); |
| 531 | } |
| 532 | |
| 533 | /* Get the value of register regnum in the previous stack frame. */ |
| 534 | |
| 535 | static struct value * |
| 536 | ft32_frame_prev_register (struct frame_info *this_frame, |
| 537 | void **this_prologue_cache, int regnum) |
| 538 | { |
| 539 | struct ft32_frame_cache *cache = ft32_frame_cache (this_frame, |
| 540 | this_prologue_cache); |
| 541 | |
| 542 | gdb_assert (regnum >= 0); |
| 543 | |
| 544 | if (regnum == FT32_SP_REGNUM && cache->saved_sp) |
| 545 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
| 546 | |
| 547 | if (regnum < FT32_NUM_REGS && cache->saved_regs[regnum] != REG_UNAVAIL) |
| 548 | return frame_unwind_got_memory (this_frame, regnum, |
| 549 | RAM_BIAS | cache->saved_regs[regnum]); |
| 550 | |
| 551 | return frame_unwind_got_register (this_frame, regnum, regnum); |
| 552 | } |
| 553 | |
| 554 | static const struct frame_unwind ft32_frame_unwind = |
| 555 | { |
| 556 | NORMAL_FRAME, |
| 557 | default_frame_unwind_stop_reason, |
| 558 | ft32_frame_this_id, |
| 559 | ft32_frame_prev_register, |
| 560 | NULL, |
| 561 | default_frame_sniffer |
| 562 | }; |
| 563 | |
| 564 | /* Return the base address of this_frame. */ |
| 565 | |
| 566 | static CORE_ADDR |
| 567 | ft32_frame_base_address (struct frame_info *this_frame, void **this_cache) |
| 568 | { |
| 569 | struct ft32_frame_cache *cache = ft32_frame_cache (this_frame, |
| 570 | this_cache); |
| 571 | |
| 572 | return cache->base; |
| 573 | } |
| 574 | |
| 575 | static const struct frame_base ft32_frame_base = |
| 576 | { |
| 577 | &ft32_frame_unwind, |
| 578 | ft32_frame_base_address, |
| 579 | ft32_frame_base_address, |
| 580 | ft32_frame_base_address |
| 581 | }; |
| 582 | |
| 583 | static struct frame_id |
| 584 | ft32_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
| 585 | { |
| 586 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, FT32_SP_REGNUM); |
| 587 | |
| 588 | return frame_id_build (sp, get_frame_pc (this_frame)); |
| 589 | } |
| 590 | |
| 591 | /* Allocate and initialize the ft32 gdbarch object. */ |
| 592 | |
| 593 | static struct gdbarch * |
| 594 | ft32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 595 | { |
| 596 | struct gdbarch *gdbarch; |
| 597 | struct gdbarch_tdep *tdep; |
| 598 | struct type *void_type; |
| 599 | struct type *func_void_type; |
| 600 | |
| 601 | /* If there is already a candidate, use it. */ |
| 602 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 603 | if (arches != NULL) |
| 604 | return arches->gdbarch; |
| 605 | |
| 606 | /* Allocate space for the new architecture. */ |
| 607 | tdep = XNEW (struct gdbarch_tdep); |
| 608 | gdbarch = gdbarch_alloc (&info, tdep); |
| 609 | |
| 610 | /* Create a type for PC. We can't use builtin types here, as they may not |
| 611 | be defined. */ |
| 612 | void_type = arch_type (gdbarch, TYPE_CODE_VOID, 1, "void"); |
| 613 | func_void_type = make_function_type (void_type, NULL); |
| 614 | tdep->pc_type = arch_type (gdbarch, TYPE_CODE_PTR, 4, NULL); |
| 615 | TYPE_TARGET_TYPE (tdep->pc_type) = func_void_type; |
| 616 | TYPE_UNSIGNED (tdep->pc_type) = 1; |
| 617 | TYPE_INSTANCE_FLAGS (tdep->pc_type) |= TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1; |
| 618 | |
| 619 | set_gdbarch_read_pc (gdbarch, ft32_read_pc); |
| 620 | set_gdbarch_write_pc (gdbarch, ft32_write_pc); |
| 621 | set_gdbarch_unwind_sp (gdbarch, ft32_unwind_sp); |
| 622 | |
| 623 | set_gdbarch_num_regs (gdbarch, FT32_NUM_REGS); |
| 624 | set_gdbarch_sp_regnum (gdbarch, FT32_SP_REGNUM); |
| 625 | set_gdbarch_pc_regnum (gdbarch, FT32_PC_REGNUM); |
| 626 | set_gdbarch_register_name (gdbarch, ft32_register_name); |
| 627 | set_gdbarch_register_type (gdbarch, ft32_register_type); |
| 628 | |
| 629 | set_gdbarch_return_value (gdbarch, ft32_return_value); |
| 630 | |
| 631 | set_gdbarch_pointer_to_address (gdbarch, ft32_pointer_to_address); |
| 632 | |
| 633 | set_gdbarch_skip_prologue (gdbarch, ft32_skip_prologue); |
| 634 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 635 | set_gdbarch_breakpoint_from_pc (gdbarch, ft32_breakpoint_from_pc); |
| 636 | set_gdbarch_frame_align (gdbarch, ft32_frame_align); |
| 637 | |
| 638 | frame_base_set_default (gdbarch, &ft32_frame_base); |
| 639 | |
| 640 | /* Methods for saving / extracting a dummy frame's ID. The ID's |
| 641 | stack address must match the SP value returned by |
| 642 | PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */ |
| 643 | set_gdbarch_dummy_id (gdbarch, ft32_dummy_id); |
| 644 | |
| 645 | set_gdbarch_unwind_pc (gdbarch, ft32_unwind_pc); |
| 646 | |
| 647 | set_gdbarch_print_insn (gdbarch, print_insn_ft32); |
| 648 | |
| 649 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 650 | gdbarch_init_osabi (info, gdbarch); |
| 651 | |
| 652 | /* Hook in the default unwinders. */ |
| 653 | frame_unwind_append_unwinder (gdbarch, &ft32_frame_unwind); |
| 654 | |
| 655 | /* Support simple overlay manager. */ |
| 656 | set_gdbarch_overlay_update (gdbarch, simple_overlay_update); |
| 657 | |
| 658 | set_gdbarch_address_class_type_flags (gdbarch, ft32_address_class_type_flags); |
| 659 | set_gdbarch_address_class_name_to_type_flags |
| 660 | (gdbarch, ft32_address_class_name_to_type_flags); |
| 661 | set_gdbarch_address_class_type_flags_to_name |
| 662 | (gdbarch, ft32_address_class_type_flags_to_name); |
| 663 | |
| 664 | return gdbarch; |
| 665 | } |
| 666 | |
| 667 | /* Register this machine's init routine. */ |
| 668 | |
| 669 | void |
| 670 | _initialize_ft32_tdep (void) |
| 671 | { |
| 672 | register_gdbarch_init (bfd_arch_ft32, ft32_gdbarch_init); |
| 673 | } |