| 1 | /* Target dependent code for the Motorola 68000 series. |
| 2 | |
| 3 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, |
| 4 | 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program 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 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program 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 this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "dwarf2-frame.h" |
| 25 | #include "frame.h" |
| 26 | #include "frame-base.h" |
| 27 | #include "frame-unwind.h" |
| 28 | #include "symtab.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "value.h" |
| 31 | #include "gdb_string.h" |
| 32 | #include "gdb_assert.h" |
| 33 | #include "inferior.h" |
| 34 | #include "regcache.h" |
| 35 | #include "arch-utils.h" |
| 36 | #include "osabi.h" |
| 37 | #include "dis-asm.h" |
| 38 | |
| 39 | #include "m68k-tdep.h" |
| 40 | \f |
| 41 | |
| 42 | #define P_LINKL_FP 0x480e |
| 43 | #define P_LINKW_FP 0x4e56 |
| 44 | #define P_PEA_FP 0x4856 |
| 45 | #define P_MOVEAL_SP_FP 0x2c4f |
| 46 | #define P_ADDAW_SP 0xdefc |
| 47 | #define P_ADDAL_SP 0xdffc |
| 48 | #define P_SUBQW_SP 0x514f |
| 49 | #define P_SUBQL_SP 0x518f |
| 50 | #define P_LEA_SP_SP 0x4fef |
| 51 | #define P_LEA_PC_A5 0x4bfb0170 |
| 52 | #define P_FMOVEMX_SP 0xf227 |
| 53 | #define P_MOVEL_SP 0x2f00 |
| 54 | #define P_MOVEML_SP 0x48e7 |
| 55 | |
| 56 | |
| 57 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
| 58 | #define REGISTER_BYTES_NOFP (16*4 + 8) |
| 59 | |
| 60 | /* Offset from SP to first arg on stack at first instruction of a function */ |
| 61 | #define SP_ARG0 (1 * 4) |
| 62 | |
| 63 | #if !defined (BPT_VECTOR) |
| 64 | #define BPT_VECTOR 0xf |
| 65 | #endif |
| 66 | |
| 67 | #if !defined (REMOTE_BPT_VECTOR) |
| 68 | #define REMOTE_BPT_VECTOR 1 |
| 69 | #endif |
| 70 | |
| 71 | |
| 72 | static const unsigned char * |
| 73 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 74 | { |
| 75 | static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
| 76 | *lenptr = sizeof (break_insn); |
| 77 | return break_insn; |
| 78 | } |
| 79 | |
| 80 | |
| 81 | static int |
| 82 | m68k_register_bytes_ok (long numbytes) |
| 83 | { |
| 84 | return ((numbytes == REGISTER_BYTES_FP) |
| 85 | || (numbytes == REGISTER_BYTES_NOFP)); |
| 86 | } |
| 87 | |
| 88 | /* Return the GDB type object for the "standard" data type of data in |
| 89 | register N. This should be int for D0-D7, SR, FPCONTROL and |
| 90 | FPSTATUS, long double for FP0-FP7, and void pointer for all others |
| 91 | (A0-A7, PC, FPIADDR). Note, for registers which contain |
| 92 | addresses return pointer to void, not pointer to char, because we |
| 93 | don't want to attempt to print the string after printing the |
| 94 | address. */ |
| 95 | |
| 96 | static struct type * |
| 97 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
| 98 | { |
| 99 | if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7) |
| 100 | return builtin_type_m68881_ext; |
| 101 | |
| 102 | if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM) |
| 103 | return builtin_type_void_func_ptr; |
| 104 | |
| 105 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM |
| 106 | || regnum == PS_REGNUM) |
| 107 | return builtin_type_int32; |
| 108 | |
| 109 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
| 110 | return builtin_type_void_data_ptr; |
| 111 | |
| 112 | return builtin_type_int32; |
| 113 | } |
| 114 | |
| 115 | /* Function: m68k_register_name |
| 116 | Returns the name of the standard m68k register regnum. */ |
| 117 | |
| 118 | static const char * |
| 119 | m68k_register_name (int regnum) |
| 120 | { |
| 121 | static char *register_names[] = { |
| 122 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
| 123 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", |
| 124 | "ps", "pc", |
| 125 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", |
| 126 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" |
| 127 | }; |
| 128 | |
| 129 | if (regnum < 0 || |
| 130 | regnum >= sizeof (register_names) / sizeof (register_names[0])) |
| 131 | internal_error (__FILE__, __LINE__, |
| 132 | "m68k_register_name: illegal register number %d", regnum); |
| 133 | else |
| 134 | return register_names[regnum]; |
| 135 | } |
| 136 | \f |
| 137 | /* Extract from an array REGBUF containing the (raw) register state, a |
| 138 | function return value of TYPE, and copy that, in virtual format, |
| 139 | into VALBUF. */ |
| 140 | |
| 141 | static void |
| 142 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
| 143 | void *valbuf) |
| 144 | { |
| 145 | int len = TYPE_LENGTH (type); |
| 146 | char buf[M68K_MAX_REGISTER_SIZE]; |
| 147 | |
| 148 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 149 | && TYPE_NFIELDS (type) == 1) |
| 150 | { |
| 151 | m68k_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); |
| 152 | return; |
| 153 | } |
| 154 | |
| 155 | if (len <= 4) |
| 156 | { |
| 157 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); |
| 158 | memcpy (valbuf, buf + (4 - len), len); |
| 159 | } |
| 160 | else if (len <= 8) |
| 161 | { |
| 162 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); |
| 163 | memcpy (valbuf, buf + (8 - len), len - 4); |
| 164 | regcache_raw_read (regcache, M68K_D1_REGNUM, |
| 165 | (char *) valbuf + (len - 4)); |
| 166 | } |
| 167 | else |
| 168 | internal_error (__FILE__, __LINE__, |
| 169 | "Cannot extract return value of %d bytes long.", len); |
| 170 | } |
| 171 | |
| 172 | /* Write into the appropriate registers a function return value stored |
| 173 | in VALBUF of type TYPE, given in virtual format. */ |
| 174 | |
| 175 | static void |
| 176 | m68k_store_return_value (struct type *type, struct regcache *regcache, |
| 177 | const void *valbuf) |
| 178 | { |
| 179 | int len = TYPE_LENGTH (type); |
| 180 | |
| 181 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 182 | && TYPE_NFIELDS (type) == 1) |
| 183 | { |
| 184 | m68k_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); |
| 185 | return; |
| 186 | } |
| 187 | |
| 188 | if (len <= 4) |
| 189 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); |
| 190 | else if (len <= 8) |
| 191 | { |
| 192 | regcache_raw_write_part (regcache, M68K_D1_REGNUM, 8 - len, |
| 193 | len - 4, valbuf); |
| 194 | regcache_raw_write (regcache, M68K_D0_REGNUM, |
| 195 | (char *) valbuf + (len - 4)); |
| 196 | } |
| 197 | else |
| 198 | internal_error (__FILE__, __LINE__, |
| 199 | "Cannot store return value of %d bytes long.", len); |
| 200 | } |
| 201 | |
| 202 | /* Extract from REGCACHE, which contains the (raw) register state, the |
| 203 | address in which a function should return its structure value, as a |
| 204 | CORE_ADDR. */ |
| 205 | |
| 206 | static CORE_ADDR |
| 207 | m68k_extract_struct_value_address (struct regcache *regcache) |
| 208 | { |
| 209 | char buf[4]; |
| 210 | |
| 211 | regcache_cooked_read (regcache, M68K_D0_REGNUM, buf); |
| 212 | return extract_unsigned_integer (buf, 4); |
| 213 | } |
| 214 | |
| 215 | static int |
| 216 | m68k_use_struct_convention (int gcc_p, struct type *type) |
| 217 | { |
| 218 | enum struct_return struct_return; |
| 219 | |
| 220 | struct_return = gdbarch_tdep (current_gdbarch)->struct_return; |
| 221 | return generic_use_struct_convention (struct_return == reg_struct_return, |
| 222 | type); |
| 223 | } |
| 224 | |
| 225 | /* A function that tells us whether the function invocation represented |
| 226 | by fi does not have a frame on the stack associated with it. If it |
| 227 | does not, FRAMELESS is set to 1, else 0. */ |
| 228 | |
| 229 | static int |
| 230 | m68k_frameless_function_invocation (struct frame_info *fi) |
| 231 | { |
| 232 | if (get_frame_type (fi) == SIGTRAMP_FRAME) |
| 233 | return 0; |
| 234 | else |
| 235 | return legacy_frameless_look_for_prologue (fi); |
| 236 | } |
| 237 | |
| 238 | int |
| 239 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
| 240 | { |
| 241 | if (name != NULL) |
| 242 | return strcmp (name, "_sigcode") == 0; |
| 243 | else |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | CORE_ADDR |
| 248 | delta68_frame_args_address (struct frame_info *frame_info) |
| 249 | { |
| 250 | /* we assume here that the only frameless functions are the system calls |
| 251 | or other functions who do not put anything on the stack. */ |
| 252 | if (get_frame_type (frame_info) == SIGTRAMP_FRAME) |
| 253 | return get_frame_base (frame_info) + 12; |
| 254 | else if (legacy_frameless_look_for_prologue (frame_info)) |
| 255 | { |
| 256 | /* Check for an interrupted system call */ |
| 257 | if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME)) |
| 258 | return get_frame_base (get_next_frame (frame_info)) + 16; |
| 259 | else |
| 260 | return get_frame_base (frame_info) + 4; |
| 261 | } |
| 262 | else |
| 263 | return get_frame_base (frame_info); |
| 264 | } |
| 265 | |
| 266 | CORE_ADDR |
| 267 | delta68_frame_saved_pc (struct frame_info *frame_info) |
| 268 | { |
| 269 | return read_memory_unsigned_integer (delta68_frame_args_address (frame_info) |
| 270 | + 4, 4); |
| 271 | } |
| 272 | |
| 273 | int |
| 274 | delta68_frame_num_args (struct frame_info *fi) |
| 275 | { |
| 276 | int val; |
| 277 | CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi); |
| 278 | int insn = read_memory_unsigned_integer (pc, 2); |
| 279 | val = 0; |
| 280 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
| 281 | val = read_memory_integer (pc + 2, 2); |
| 282 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
| 283 | || (insn & 0170777) == 0050117) /* addqw */ |
| 284 | { |
| 285 | val = (insn >> 9) & 7; |
| 286 | if (val == 0) |
| 287 | val = 8; |
| 288 | } |
| 289 | else if (insn == 0157774) /* addal #WW, sp */ |
| 290 | val = read_memory_integer (pc + 2, 4); |
| 291 | val >>= 2; |
| 292 | return val; |
| 293 | } |
| 294 | |
| 295 | static CORE_ADDR |
| 296 | m68k_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, |
| 297 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
| 298 | struct value **args, CORE_ADDR sp, int struct_return, |
| 299 | CORE_ADDR struct_addr) |
| 300 | { |
| 301 | char buf[4]; |
| 302 | int i; |
| 303 | |
| 304 | /* Push arguments in reverse order. */ |
| 305 | for (i = nargs - 1; i >= 0; i--) |
| 306 | { |
| 307 | struct type *value_type = VALUE_ENCLOSING_TYPE (args[i]); |
| 308 | int len = TYPE_LENGTH (value_type); |
| 309 | int container_len = (len + 3) & ~3; |
| 310 | int offset; |
| 311 | |
| 312 | /* Non-scalars bigger than 4 bytes are left aligned, others are |
| 313 | right aligned. */ |
| 314 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT |
| 315 | || TYPE_CODE (value_type) == TYPE_CODE_UNION |
| 316 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) |
| 317 | && len > 4) |
| 318 | offset = 0; |
| 319 | else |
| 320 | offset = container_len - len; |
| 321 | sp -= container_len; |
| 322 | write_memory (sp + offset, VALUE_CONTENTS_ALL (args[i]), len); |
| 323 | } |
| 324 | |
| 325 | /* Store struct value address. */ |
| 326 | if (struct_return) |
| 327 | { |
| 328 | store_unsigned_integer (buf, 4, struct_addr); |
| 329 | regcache_cooked_write (regcache, M68K_A1_REGNUM, buf); |
| 330 | } |
| 331 | |
| 332 | /* Store return address. */ |
| 333 | sp -= 4; |
| 334 | store_unsigned_integer (buf, 4, bp_addr); |
| 335 | write_memory (sp, buf, 4); |
| 336 | |
| 337 | /* Finally, update the stack pointer... */ |
| 338 | store_unsigned_integer (buf, 4, sp); |
| 339 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); |
| 340 | |
| 341 | /* ...and fake a frame pointer. */ |
| 342 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); |
| 343 | |
| 344 | /* DWARF2/GCC uses the stack address *before* the function call as a |
| 345 | frame's CFA. */ |
| 346 | return sp + 8; |
| 347 | } |
| 348 | \f |
| 349 | struct m68k_frame_cache |
| 350 | { |
| 351 | /* Base address. */ |
| 352 | CORE_ADDR base; |
| 353 | CORE_ADDR sp_offset; |
| 354 | CORE_ADDR pc; |
| 355 | |
| 356 | /* Saved registers. */ |
| 357 | CORE_ADDR saved_regs[M68K_NUM_REGS]; |
| 358 | CORE_ADDR saved_sp; |
| 359 | |
| 360 | /* Stack space reserved for local variables. */ |
| 361 | long locals; |
| 362 | }; |
| 363 | |
| 364 | /* Allocate and initialize a frame cache. */ |
| 365 | |
| 366 | static struct m68k_frame_cache * |
| 367 | m68k_alloc_frame_cache (void) |
| 368 | { |
| 369 | struct m68k_frame_cache *cache; |
| 370 | int i; |
| 371 | |
| 372 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
| 373 | |
| 374 | /* Base address. */ |
| 375 | cache->base = 0; |
| 376 | cache->sp_offset = -4; |
| 377 | cache->pc = 0; |
| 378 | |
| 379 | /* Saved registers. We initialize these to -1 since zero is a valid |
| 380 | offset (that's where %fp is supposed to be stored). */ |
| 381 | for (i = 0; i < M68K_NUM_REGS; i++) |
| 382 | cache->saved_regs[i] = -1; |
| 383 | |
| 384 | /* Frameless until proven otherwise. */ |
| 385 | cache->locals = -1; |
| 386 | |
| 387 | return cache; |
| 388 | } |
| 389 | |
| 390 | /* Check whether PC points at a code that sets up a new stack frame. |
| 391 | If so, it updates CACHE and returns the address of the first |
| 392 | instruction after the sequence that sets removes the "hidden" |
| 393 | argument from the stack or CURRENT_PC, whichever is smaller. |
| 394 | Otherwise, return PC. */ |
| 395 | |
| 396 | static CORE_ADDR |
| 397 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, |
| 398 | struct m68k_frame_cache *cache) |
| 399 | { |
| 400 | int op; |
| 401 | |
| 402 | if (pc >= current_pc) |
| 403 | return current_pc; |
| 404 | |
| 405 | op = read_memory_unsigned_integer (pc, 2); |
| 406 | |
| 407 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) |
| 408 | { |
| 409 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
| 410 | cache->sp_offset += 4; |
| 411 | if (op == P_LINKW_FP) |
| 412 | { |
| 413 | /* link.w %fp, #-N */ |
| 414 | /* link.w %fp, #0; adda.l #-N, %sp */ |
| 415 | cache->locals = -read_memory_integer (pc + 2, 2); |
| 416 | |
| 417 | if (pc + 4 < current_pc && cache->locals == 0) |
| 418 | { |
| 419 | op = read_memory_unsigned_integer (pc + 4, 2); |
| 420 | if (op == P_ADDAL_SP) |
| 421 | { |
| 422 | cache->locals = read_memory_integer (pc + 6, 4); |
| 423 | return pc + 10; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | return pc + 4; |
| 428 | } |
| 429 | else if (op == P_LINKL_FP) |
| 430 | { |
| 431 | /* link.l %fp, #-N */ |
| 432 | cache->locals = -read_memory_integer (pc + 2, 4); |
| 433 | return pc + 6; |
| 434 | } |
| 435 | else |
| 436 | { |
| 437 | /* pea (%fp); movea.l %sp, %fp */ |
| 438 | cache->locals = 0; |
| 439 | |
| 440 | if (pc + 2 < current_pc) |
| 441 | { |
| 442 | op = read_memory_unsigned_integer (pc + 2, 2); |
| 443 | |
| 444 | if (op == P_MOVEAL_SP_FP) |
| 445 | { |
| 446 | /* move.l %sp, %fp */ |
| 447 | return pc + 4; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | return pc + 2; |
| 452 | } |
| 453 | } |
| 454 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
| 455 | { |
| 456 | /* subq.[wl] #N,%sp */ |
| 457 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ |
| 458 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; |
| 459 | if (pc + 2 < current_pc) |
| 460 | { |
| 461 | op = read_memory_unsigned_integer (pc + 2, 2); |
| 462 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
| 463 | { |
| 464 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; |
| 465 | return pc + 4; |
| 466 | } |
| 467 | } |
| 468 | return pc + 2; |
| 469 | } |
| 470 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) |
| 471 | { |
| 472 | /* adda.w #-N,%sp */ |
| 473 | /* lea (-N,%sp),%sp */ |
| 474 | cache->locals = -read_memory_integer (pc + 2, 2); |
| 475 | return pc + 4; |
| 476 | } |
| 477 | else if (op == P_ADDAL_SP) |
| 478 | { |
| 479 | /* adda.l #-N,%sp */ |
| 480 | cache->locals = -read_memory_integer (pc + 2, 4); |
| 481 | return pc + 6; |
| 482 | } |
| 483 | |
| 484 | return pc; |
| 485 | } |
| 486 | |
| 487 | /* Check whether PC points at code that saves registers on the stack. |
| 488 | If so, it updates CACHE and returns the address of the first |
| 489 | instruction after the register saves or CURRENT_PC, whichever is |
| 490 | smaller. Otherwise, return PC. */ |
| 491 | |
| 492 | static CORE_ADDR |
| 493 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, |
| 494 | struct m68k_frame_cache *cache) |
| 495 | { |
| 496 | if (cache->locals >= 0) |
| 497 | { |
| 498 | CORE_ADDR offset; |
| 499 | int op; |
| 500 | int i, mask, regno; |
| 501 | |
| 502 | offset = -4 - cache->locals; |
| 503 | while (pc < current_pc) |
| 504 | { |
| 505 | op = read_memory_unsigned_integer (pc, 2); |
| 506 | if (op == P_FMOVEMX_SP) |
| 507 | { |
| 508 | /* fmovem.x REGS,-(%sp) */ |
| 509 | op = read_memory_unsigned_integer (pc + 2, 2); |
| 510 | if ((op & 0xff00) == 0xe000) |
| 511 | { |
| 512 | mask = op & 0xff; |
| 513 | for (i = 0; i < 16; i++, mask >>= 1) |
| 514 | { |
| 515 | if (mask & 1) |
| 516 | { |
| 517 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; |
| 518 | offset -= 12; |
| 519 | } |
| 520 | } |
| 521 | pc += 4; |
| 522 | } |
| 523 | else |
| 524 | break; |
| 525 | } |
| 526 | else if ((op & 0170677) == P_MOVEL_SP) |
| 527 | { |
| 528 | /* move.l %R,-(%sp) */ |
| 529 | regno = ((op & 07000) >> 9) | ((op & 0100) >> 3); |
| 530 | cache->saved_regs[regno] = offset; |
| 531 | offset -= 4; |
| 532 | pc += 2; |
| 533 | } |
| 534 | else if (op == P_MOVEML_SP) |
| 535 | { |
| 536 | /* movem.l REGS,-(%sp) */ |
| 537 | mask = read_memory_unsigned_integer (pc + 2, 2); |
| 538 | for (i = 0; i < 16; i++, mask >>= 1) |
| 539 | { |
| 540 | if (mask & 1) |
| 541 | { |
| 542 | cache->saved_regs[15 - i] = offset; |
| 543 | offset -= 4; |
| 544 | } |
| 545 | } |
| 546 | pc += 4; |
| 547 | } |
| 548 | else |
| 549 | break; |
| 550 | } |
| 551 | } |
| 552 | |
| 553 | return pc; |
| 554 | } |
| 555 | |
| 556 | |
| 557 | /* Do a full analysis of the prologue at PC and update CACHE |
| 558 | accordingly. Bail out early if CURRENT_PC is reached. Return the |
| 559 | address where the analysis stopped. |
| 560 | |
| 561 | We handle all cases that can be generated by gcc. |
| 562 | |
| 563 | For allocating a stack frame: |
| 564 | |
| 565 | link.w %a6,#-N |
| 566 | link.l %a6,#-N |
| 567 | pea (%fp); move.l %sp,%fp |
| 568 | link.w %a6,#0; add.l #-N,%sp |
| 569 | subq.l #N,%sp |
| 570 | subq.w #N,%sp |
| 571 | subq.w #8,%sp; subq.w #N-8,%sp |
| 572 | add.w #-N,%sp |
| 573 | lea (-N,%sp),%sp |
| 574 | add.l #-N,%sp |
| 575 | |
| 576 | For saving registers: |
| 577 | |
| 578 | fmovem.x REGS,-(%sp) |
| 579 | move.l R1,-(%sp) |
| 580 | move.l R1,-(%sp); move.l R2,-(%sp) |
| 581 | movem.l REGS,-(%sp) |
| 582 | |
| 583 | For setting up the PIC register: |
| 584 | |
| 585 | lea (%pc,N),%a5 |
| 586 | |
| 587 | */ |
| 588 | |
| 589 | static CORE_ADDR |
| 590 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
| 591 | struct m68k_frame_cache *cache) |
| 592 | { |
| 593 | unsigned int op; |
| 594 | |
| 595 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
| 596 | pc = m68k_analyze_register_saves (pc, current_pc, cache); |
| 597 | if (pc >= current_pc) |
| 598 | return current_pc; |
| 599 | |
| 600 | /* Check for GOT setup. */ |
| 601 | op = read_memory_unsigned_integer (pc, 4); |
| 602 | if (op == P_LEA_PC_A5) |
| 603 | { |
| 604 | /* lea (%pc,N),%a5 */ |
| 605 | return pc + 6; |
| 606 | } |
| 607 | |
| 608 | return pc; |
| 609 | } |
| 610 | |
| 611 | /* Return PC of first real instruction. */ |
| 612 | |
| 613 | static CORE_ADDR |
| 614 | m68k_skip_prologue (CORE_ADDR start_pc) |
| 615 | { |
| 616 | struct m68k_frame_cache cache; |
| 617 | CORE_ADDR pc; |
| 618 | int op; |
| 619 | |
| 620 | cache.locals = -1; |
| 621 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); |
| 622 | if (cache.locals < 0) |
| 623 | return start_pc; |
| 624 | return pc; |
| 625 | } |
| 626 | |
| 627 | static CORE_ADDR |
| 628 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 629 | { |
| 630 | char buf[8]; |
| 631 | |
| 632 | frame_unwind_register (next_frame, PC_REGNUM, buf); |
| 633 | return extract_typed_address (buf, builtin_type_void_func_ptr); |
| 634 | } |
| 635 | \f |
| 636 | /* Normal frames. */ |
| 637 | |
| 638 | static struct m68k_frame_cache * |
| 639 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 640 | { |
| 641 | struct m68k_frame_cache *cache; |
| 642 | char buf[4]; |
| 643 | int i; |
| 644 | |
| 645 | if (*this_cache) |
| 646 | return *this_cache; |
| 647 | |
| 648 | cache = m68k_alloc_frame_cache (); |
| 649 | *this_cache = cache; |
| 650 | |
| 651 | /* In principle, for normal frames, %fp holds the frame pointer, |
| 652 | which holds the base address for the current stack frame. |
| 653 | However, for functions that don't need it, the frame pointer is |
| 654 | optional. For these "frameless" functions the frame pointer is |
| 655 | actually the frame pointer of the calling frame. Signal |
| 656 | trampolines are just a special case of a "frameless" function. |
| 657 | They (usually) share their frame pointer with the frame that was |
| 658 | in progress when the signal occurred. */ |
| 659 | |
| 660 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
| 661 | cache->base = extract_unsigned_integer (buf, 4); |
| 662 | if (cache->base == 0) |
| 663 | return cache; |
| 664 | |
| 665 | /* For normal frames, %pc is stored at 4(%fp). */ |
| 666 | cache->saved_regs[M68K_PC_REGNUM] = 4; |
| 667 | |
| 668 | cache->pc = frame_func_unwind (next_frame); |
| 669 | if (cache->pc != 0) |
| 670 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); |
| 671 | |
| 672 | if (cache->locals < 0) |
| 673 | { |
| 674 | /* We didn't find a valid frame, which means that CACHE->base |
| 675 | currently holds the frame pointer for our calling frame. If |
| 676 | we're at the start of a function, or somewhere half-way its |
| 677 | prologue, the function's frame probably hasn't been fully |
| 678 | setup yet. Try to reconstruct the base address for the stack |
| 679 | frame by looking at the stack pointer. For truly "frameless" |
| 680 | functions this might work too. */ |
| 681 | |
| 682 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); |
| 683 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; |
| 684 | } |
| 685 | |
| 686 | /* Now that we have the base address for the stack frame we can |
| 687 | calculate the value of %sp in the calling frame. */ |
| 688 | cache->saved_sp = cache->base + 8; |
| 689 | |
| 690 | /* Adjust all the saved registers such that they contain addresses |
| 691 | instead of offsets. */ |
| 692 | for (i = 0; i < M68K_NUM_REGS; i++) |
| 693 | if (cache->saved_regs[i] != -1) |
| 694 | cache->saved_regs[i] += cache->base; |
| 695 | |
| 696 | return cache; |
| 697 | } |
| 698 | |
| 699 | static void |
| 700 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| 701 | struct frame_id *this_id) |
| 702 | { |
| 703 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); |
| 704 | |
| 705 | /* This marks the outermost frame. */ |
| 706 | if (cache->base == 0) |
| 707 | return; |
| 708 | |
| 709 | /* See the end of m68k_push_dummy_call. */ |
| 710 | *this_id = frame_id_build (cache->base + 8, cache->pc); |
| 711 | } |
| 712 | |
| 713 | static void |
| 714 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, |
| 715 | int regnum, int *optimizedp, |
| 716 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 717 | int *realnump, void *valuep) |
| 718 | { |
| 719 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); |
| 720 | |
| 721 | gdb_assert (regnum >= 0); |
| 722 | |
| 723 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) |
| 724 | { |
| 725 | *optimizedp = 0; |
| 726 | *lvalp = not_lval; |
| 727 | *addrp = 0; |
| 728 | *realnump = -1; |
| 729 | if (valuep) |
| 730 | { |
| 731 | /* Store the value. */ |
| 732 | store_unsigned_integer (valuep, 4, cache->saved_sp); |
| 733 | } |
| 734 | return; |
| 735 | } |
| 736 | |
| 737 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) |
| 738 | { |
| 739 | *optimizedp = 0; |
| 740 | *lvalp = lval_memory; |
| 741 | *addrp = cache->saved_regs[regnum]; |
| 742 | *realnump = -1; |
| 743 | if (valuep) |
| 744 | { |
| 745 | /* Read the value in from memory. */ |
| 746 | read_memory (*addrp, valuep, |
| 747 | register_size (current_gdbarch, regnum)); |
| 748 | } |
| 749 | return; |
| 750 | } |
| 751 | |
| 752 | frame_register_unwind (next_frame, regnum, |
| 753 | optimizedp, lvalp, addrp, realnump, valuep); |
| 754 | } |
| 755 | |
| 756 | static const struct frame_unwind m68k_frame_unwind = |
| 757 | { |
| 758 | NORMAL_FRAME, |
| 759 | m68k_frame_this_id, |
| 760 | m68k_frame_prev_register |
| 761 | }; |
| 762 | |
| 763 | static const struct frame_unwind * |
| 764 | m68k_frame_sniffer (struct frame_info *next_frame) |
| 765 | { |
| 766 | return &m68k_frame_unwind; |
| 767 | } |
| 768 | \f |
| 769 | /* Signal trampolines. */ |
| 770 | |
| 771 | static struct m68k_frame_cache * |
| 772 | m68k_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache) |
| 773 | { |
| 774 | struct m68k_frame_cache *cache; |
| 775 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 776 | struct m68k_sigtramp_info info; |
| 777 | char buf[4]; |
| 778 | int i; |
| 779 | |
| 780 | if (*this_cache) |
| 781 | return *this_cache; |
| 782 | |
| 783 | cache = m68k_alloc_frame_cache (); |
| 784 | |
| 785 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); |
| 786 | cache->base = extract_unsigned_integer (buf, 4) - 4; |
| 787 | |
| 788 | info = tdep->get_sigtramp_info (next_frame); |
| 789 | |
| 790 | for (i = 0; i < M68K_NUM_REGS; i++) |
| 791 | if (info.sc_reg_offset[i] != -1) |
| 792 | cache->saved_regs[i] = info.sigcontext_addr + info.sc_reg_offset[i]; |
| 793 | |
| 794 | *this_cache = cache; |
| 795 | return cache; |
| 796 | } |
| 797 | |
| 798 | static void |
| 799 | m68k_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| 800 | struct frame_id *this_id) |
| 801 | { |
| 802 | struct m68k_frame_cache *cache = |
| 803 | m68k_sigtramp_frame_cache (next_frame, this_cache); |
| 804 | |
| 805 | /* See the end of m68k_push_dummy_call. */ |
| 806 | *this_id = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame)); |
| 807 | } |
| 808 | |
| 809 | static void |
| 810 | m68k_sigtramp_frame_prev_register (struct frame_info *next_frame, |
| 811 | void **this_cache, |
| 812 | int regnum, int *optimizedp, |
| 813 | enum lval_type *lvalp, CORE_ADDR *addrp, |
| 814 | int *realnump, void *valuep) |
| 815 | { |
| 816 | /* Make sure we've initialized the cache. */ |
| 817 | m68k_sigtramp_frame_cache (next_frame, this_cache); |
| 818 | |
| 819 | m68k_frame_prev_register (next_frame, this_cache, regnum, |
| 820 | optimizedp, lvalp, addrp, realnump, valuep); |
| 821 | } |
| 822 | |
| 823 | static const struct frame_unwind m68k_sigtramp_frame_unwind = |
| 824 | { |
| 825 | SIGTRAMP_FRAME, |
| 826 | m68k_sigtramp_frame_this_id, |
| 827 | m68k_sigtramp_frame_prev_register |
| 828 | }; |
| 829 | |
| 830 | static const struct frame_unwind * |
| 831 | m68k_sigtramp_frame_sniffer (struct frame_info *next_frame) |
| 832 | { |
| 833 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 834 | char *name; |
| 835 | |
| 836 | /* We shouldn't even bother to try if the OSABI didn't register |
| 837 | a get_sigtramp_info handler. */ |
| 838 | if (!gdbarch_tdep (current_gdbarch)->get_sigtramp_info) |
| 839 | return NULL; |
| 840 | |
| 841 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 842 | if (PC_IN_SIGTRAMP (pc, name)) |
| 843 | return &m68k_sigtramp_frame_unwind; |
| 844 | |
| 845 | return NULL; |
| 846 | } |
| 847 | \f |
| 848 | static CORE_ADDR |
| 849 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) |
| 850 | { |
| 851 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); |
| 852 | |
| 853 | return cache->base; |
| 854 | } |
| 855 | |
| 856 | static const struct frame_base m68k_frame_base = |
| 857 | { |
| 858 | &m68k_frame_unwind, |
| 859 | m68k_frame_base_address, |
| 860 | m68k_frame_base_address, |
| 861 | m68k_frame_base_address |
| 862 | }; |
| 863 | |
| 864 | static struct frame_id |
| 865 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 866 | { |
| 867 | char buf[4]; |
| 868 | CORE_ADDR fp; |
| 869 | |
| 870 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
| 871 | fp = extract_unsigned_integer (buf, 4); |
| 872 | |
| 873 | /* See the end of m68k_push_dummy_call. */ |
| 874 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); |
| 875 | } |
| 876 | \f |
| 877 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
| 878 | |
| 879 | #include <sys/procfs.h> |
| 880 | |
| 881 | /* Prototypes for supply_gregset etc. */ |
| 882 | #include "gregset.h" |
| 883 | |
| 884 | /* The /proc interface divides the target machine's register set up into |
| 885 | two different sets, the general register set (gregset) and the floating |
| 886 | point register set (fpregset). For each set, there is an ioctl to get |
| 887 | the current register set and another ioctl to set the current values. |
| 888 | |
| 889 | The actual structure passed through the ioctl interface is, of course, |
| 890 | naturally machine dependent, and is different for each set of registers. |
| 891 | For the m68k for example, the general register set is typically defined |
| 892 | by: |
| 893 | |
| 894 | typedef int gregset_t[18]; |
| 895 | |
| 896 | #define R_D0 0 |
| 897 | ... |
| 898 | #define R_PS 17 |
| 899 | |
| 900 | and the floating point set by: |
| 901 | |
| 902 | typedef struct fpregset { |
| 903 | int f_pcr; |
| 904 | int f_psr; |
| 905 | int f_fpiaddr; |
| 906 | int f_fpregs[8][3]; (8 regs, 96 bits each) |
| 907 | } fpregset_t; |
| 908 | |
| 909 | These routines provide the packing and unpacking of gregset_t and |
| 910 | fpregset_t formatted data. |
| 911 | |
| 912 | */ |
| 913 | |
| 914 | /* Atari SVR4 has R_SR but not R_PS */ |
| 915 | |
| 916 | #if !defined (R_PS) && defined (R_SR) |
| 917 | #define R_PS R_SR |
| 918 | #endif |
| 919 | |
| 920 | /* Given a pointer to a general register set in /proc format (gregset_t *), |
| 921 | unpack the register contents and supply them as gdb's idea of the current |
| 922 | register values. */ |
| 923 | |
| 924 | void |
| 925 | supply_gregset (gregset_t *gregsetp) |
| 926 | { |
| 927 | int regi; |
| 928 | greg_t *regp = (greg_t *) gregsetp; |
| 929 | |
| 930 | for (regi = 0; regi < R_PC; regi++) |
| 931 | { |
| 932 | supply_register (regi, (char *) (regp + regi)); |
| 933 | } |
| 934 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); |
| 935 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); |
| 936 | } |
| 937 | |
| 938 | void |
| 939 | fill_gregset (gregset_t *gregsetp, int regno) |
| 940 | { |
| 941 | int regi; |
| 942 | greg_t *regp = (greg_t *) gregsetp; |
| 943 | |
| 944 | for (regi = 0; regi < R_PC; regi++) |
| 945 | { |
| 946 | if (regno == -1 || regno == regi) |
| 947 | regcache_collect (regi, regp + regi); |
| 948 | } |
| 949 | if (regno == -1 || regno == PS_REGNUM) |
| 950 | regcache_collect (PS_REGNUM, regp + R_PS); |
| 951 | if (regno == -1 || regno == PC_REGNUM) |
| 952 | regcache_collect (PC_REGNUM, regp + R_PC); |
| 953 | } |
| 954 | |
| 955 | #if defined (FP0_REGNUM) |
| 956 | |
| 957 | /* Given a pointer to a floating point register set in /proc format |
| 958 | (fpregset_t *), unpack the register contents and supply them as gdb's |
| 959 | idea of the current floating point register values. */ |
| 960 | |
| 961 | void |
| 962 | supply_fpregset (fpregset_t *fpregsetp) |
| 963 | { |
| 964 | int regi; |
| 965 | char *from; |
| 966 | |
| 967 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
| 968 | { |
| 969 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
| 970 | supply_register (regi, from); |
| 971 | } |
| 972 | supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
| 973 | supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr)); |
| 974 | supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); |
| 975 | } |
| 976 | |
| 977 | /* Given a pointer to a floating point register set in /proc format |
| 978 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
| 979 | of the current floating point register set. If REGNO is -1, update |
| 980 | them all. */ |
| 981 | |
| 982 | void |
| 983 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
| 984 | { |
| 985 | int regi; |
| 986 | |
| 987 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
| 988 | { |
| 989 | if (regno == -1 || regno == regi) |
| 990 | regcache_collect (regi, &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
| 991 | } |
| 992 | if (regno == -1 || regno == M68K_FPC_REGNUM) |
| 993 | regcache_collect (M68K_FPC_REGNUM, &fpregsetp->f_pcr); |
| 994 | if (regno == -1 || regno == M68K_FPS_REGNUM) |
| 995 | regcache_collect (M68K_FPS_REGNUM, &fpregsetp->f_psr); |
| 996 | if (regno == -1 || regno == M68K_FPI_REGNUM) |
| 997 | regcache_collect (M68K_FPI_REGNUM, &fpregsetp->f_fpiaddr); |
| 998 | } |
| 999 | |
| 1000 | #endif /* defined (FP0_REGNUM) */ |
| 1001 | |
| 1002 | #endif /* USE_PROC_FS */ |
| 1003 | |
| 1004 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
| 1005 | We expect the first arg to be a pointer to the jmp_buf structure from which |
| 1006 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| 1007 | This routine returns true on success. */ |
| 1008 | |
| 1009 | int |
| 1010 | m68k_get_longjmp_target (CORE_ADDR *pc) |
| 1011 | { |
| 1012 | char *buf; |
| 1013 | CORE_ADDR sp, jb_addr; |
| 1014 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 1015 | |
| 1016 | if (tdep->jb_pc < 0) |
| 1017 | { |
| 1018 | internal_error (__FILE__, __LINE__, |
| 1019 | "m68k_get_longjmp_target: not implemented"); |
| 1020 | return 0; |
| 1021 | } |
| 1022 | |
| 1023 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 1024 | sp = read_register (SP_REGNUM); |
| 1025 | |
| 1026 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
| 1027 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 1028 | return 0; |
| 1029 | |
| 1030 | jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 1031 | |
| 1032 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
| 1033 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 1034 | return 0; |
| 1035 | |
| 1036 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 1037 | return 1; |
| 1038 | } |
| 1039 | |
| 1040 | /* Function: m68k_gdbarch_init |
| 1041 | Initializer function for the m68k gdbarch vector. |
| 1042 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
| 1043 | |
| 1044 | static struct gdbarch * |
| 1045 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1046 | { |
| 1047 | struct gdbarch_tdep *tdep = NULL; |
| 1048 | struct gdbarch *gdbarch; |
| 1049 | |
| 1050 | /* find a candidate among the list of pre-declared architectures. */ |
| 1051 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1052 | if (arches != NULL) |
| 1053 | return (arches->gdbarch); |
| 1054 | |
| 1055 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
| 1056 | gdbarch = gdbarch_alloc (&info, tdep); |
| 1057 | |
| 1058 | set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
| 1059 | set_gdbarch_long_double_bit (gdbarch, 96); |
| 1060 | |
| 1061 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
| 1062 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
| 1063 | |
| 1064 | /* Stack grows down. */ |
| 1065 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1066 | set_gdbarch_parm_boundary (gdbarch, 32); |
| 1067 | |
| 1068 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); |
| 1069 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
| 1070 | |
| 1071 | set_gdbarch_extract_return_value (gdbarch, m68k_extract_return_value); |
| 1072 | set_gdbarch_store_return_value (gdbarch, m68k_store_return_value); |
| 1073 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68k_extract_struct_value_address); |
| 1074 | set_gdbarch_use_struct_convention (gdbarch, m68k_use_struct_convention); |
| 1075 | |
| 1076 | set_gdbarch_deprecated_frameless_function_invocation (gdbarch, m68k_frameless_function_invocation); |
| 1077 | set_gdbarch_frame_args_skip (gdbarch, 8); |
| 1078 | |
| 1079 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
| 1080 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
| 1081 | set_gdbarch_num_regs (gdbarch, 29); |
| 1082 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); |
| 1083 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
| 1084 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
| 1085 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); |
| 1086 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); |
| 1087 | |
| 1088 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
| 1089 | |
| 1090 | /* Disassembler. */ |
| 1091 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); |
| 1092 | |
| 1093 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
| 1094 | tdep->jb_pc = JB_PC; |
| 1095 | tdep->jb_elt_size = JB_ELEMENT_SIZE; |
| 1096 | #else |
| 1097 | tdep->jb_pc = -1; |
| 1098 | #endif |
| 1099 | tdep->get_sigtramp_info = NULL; |
| 1100 | tdep->struct_return = pcc_struct_return; |
| 1101 | |
| 1102 | /* Frame unwinder. */ |
| 1103 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); |
| 1104 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
| 1105 | |
| 1106 | /* Hook in the DWARF CFI frame unwinder. */ |
| 1107 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); |
| 1108 | |
| 1109 | frame_base_set_default (gdbarch, &m68k_frame_base); |
| 1110 | |
| 1111 | /* Hook in ABI-specific overrides, if they have been registered. */ |
| 1112 | gdbarch_init_osabi (info, gdbarch); |
| 1113 | |
| 1114 | /* Now we have tuned the configuration, set a few final things, |
| 1115 | based on what the OS ABI has told us. */ |
| 1116 | |
| 1117 | if (tdep->jb_pc >= 0) |
| 1118 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); |
| 1119 | |
| 1120 | frame_unwind_append_sniffer (gdbarch, m68k_sigtramp_frame_sniffer); |
| 1121 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
| 1122 | |
| 1123 | return gdbarch; |
| 1124 | } |
| 1125 | |
| 1126 | |
| 1127 | static void |
| 1128 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) |
| 1129 | { |
| 1130 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
| 1131 | |
| 1132 | if (tdep == NULL) |
| 1133 | return; |
| 1134 | } |
| 1135 | |
| 1136 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
| 1137 | |
| 1138 | void |
| 1139 | _initialize_m68k_tdep (void) |
| 1140 | { |
| 1141 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
| 1142 | } |