| 1 | /* Target dependent code for the Motorola 68000 series. |
| 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001 |
| 3 | 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "symtab.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "value.h" |
| 27 | #include "gdb_string.h" |
| 28 | #include "inferior.h" |
| 29 | #include "regcache.h" |
| 30 | \f |
| 31 | |
| 32 | #define P_LINKL_FP 0x480e |
| 33 | #define P_LINKW_FP 0x4e56 |
| 34 | #define P_PEA_FP 0x4856 |
| 35 | #define P_MOVL_SP_FP 0x2c4f |
| 36 | #define P_MOVL 0x207c |
| 37 | #define P_JSR 0x4eb9 |
| 38 | #define P_BSR 0x61ff |
| 39 | #define P_LEAL 0x43fb |
| 40 | #define P_MOVML 0x48ef |
| 41 | #define P_FMOVM 0xf237 |
| 42 | #define P_TRAP 0x4e40 |
| 43 | |
| 44 | /* The only reason this is here is the tm-altos.h reference below. It |
| 45 | was moved back here from tm-m68k.h. FIXME? */ |
| 46 | |
| 47 | extern CORE_ADDR |
| 48 | altos_skip_prologue (CORE_ADDR pc) |
| 49 | { |
| 50 | register int op = read_memory_integer (pc, 2); |
| 51 | if (op == P_LINKW_FP) |
| 52 | pc += 4; /* Skip link #word */ |
| 53 | else if (op == P_LINKL_FP) |
| 54 | pc += 6; /* Skip link #long */ |
| 55 | /* Not sure why branches are here. */ |
| 56 | /* From tm-altos.h */ |
| 57 | else if (op == 0060000) |
| 58 | pc += 4; /* Skip bra #word */ |
| 59 | else if (op == 00600377) |
| 60 | pc += 6; /* skip bra #long */ |
| 61 | else if ((op & 0177400) == 0060000) |
| 62 | pc += 2; /* skip bra #char */ |
| 63 | return pc; |
| 64 | } |
| 65 | |
| 66 | int |
| 67 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
| 68 | { |
| 69 | if (name != NULL) |
| 70 | return strcmp (name, "_sigcode") == 0; |
| 71 | else |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | CORE_ADDR |
| 76 | delta68_frame_args_address (struct frame_info *frame_info) |
| 77 | { |
| 78 | /* we assume here that the only frameless functions are the system calls |
| 79 | or other functions who do not put anything on the stack. */ |
| 80 | if (frame_info->signal_handler_caller) |
| 81 | return frame_info->frame + 12; |
| 82 | else if (frameless_look_for_prologue (frame_info)) |
| 83 | { |
| 84 | /* Check for an interrupted system call */ |
| 85 | if (frame_info->next && frame_info->next->signal_handler_caller) |
| 86 | return frame_info->next->frame + 16; |
| 87 | else |
| 88 | return frame_info->frame + 4; |
| 89 | } |
| 90 | else |
| 91 | return frame_info->frame; |
| 92 | } |
| 93 | |
| 94 | CORE_ADDR |
| 95 | delta68_frame_saved_pc (struct frame_info *frame_info) |
| 96 | { |
| 97 | return read_memory_integer (delta68_frame_args_address (frame_info) + 4, 4); |
| 98 | } |
| 99 | |
| 100 | /* Return number of args passed to a frame. |
| 101 | Can return -1, meaning no way to tell. */ |
| 102 | |
| 103 | int |
| 104 | isi_frame_num_args (struct frame_info *fi) |
| 105 | { |
| 106 | int val; |
| 107 | CORE_ADDR pc = FRAME_SAVED_PC (fi); |
| 108 | int insn = 0177777 & read_memory_integer (pc, 2); |
| 109 | val = 0; |
| 110 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
| 111 | val = read_memory_integer (pc + 2, 2); |
| 112 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
| 113 | || (insn & 0170777) == 0050117) /* addqw */ |
| 114 | { |
| 115 | val = (insn >> 9) & 7; |
| 116 | if (val == 0) |
| 117 | val = 8; |
| 118 | } |
| 119 | else if (insn == 0157774) /* addal #WW, sp */ |
| 120 | val = read_memory_integer (pc + 2, 4); |
| 121 | val >>= 2; |
| 122 | return val; |
| 123 | } |
| 124 | |
| 125 | int |
| 126 | delta68_frame_num_args (struct frame_info *fi) |
| 127 | { |
| 128 | int val; |
| 129 | CORE_ADDR pc = FRAME_SAVED_PC (fi); |
| 130 | int insn = 0177777 & read_memory_integer (pc, 2); |
| 131 | val = 0; |
| 132 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
| 133 | val = read_memory_integer (pc + 2, 2); |
| 134 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
| 135 | || (insn & 0170777) == 0050117) /* addqw */ |
| 136 | { |
| 137 | val = (insn >> 9) & 7; |
| 138 | if (val == 0) |
| 139 | val = 8; |
| 140 | } |
| 141 | else if (insn == 0157774) /* addal #WW, sp */ |
| 142 | val = read_memory_integer (pc + 2, 4); |
| 143 | val >>= 2; |
| 144 | return val; |
| 145 | } |
| 146 | |
| 147 | int |
| 148 | news_frame_num_args (struct frame_info *fi) |
| 149 | { |
| 150 | int val; |
| 151 | CORE_ADDR pc = FRAME_SAVED_PC (fi); |
| 152 | int insn = 0177777 & read_memory_integer (pc, 2); |
| 153 | val = 0; |
| 154 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
| 155 | val = read_memory_integer (pc + 2, 2); |
| 156 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
| 157 | || (insn & 0170777) == 0050117) /* addqw */ |
| 158 | { |
| 159 | val = (insn >> 9) & 7; |
| 160 | if (val == 0) |
| 161 | val = 8; |
| 162 | } |
| 163 | else if (insn == 0157774) /* addal #WW, sp */ |
| 164 | val = read_memory_integer (pc + 2, 4); |
| 165 | val >>= 2; |
| 166 | return val; |
| 167 | } |
| 168 | |
| 169 | /* Push an empty stack frame, to record the current PC, etc. */ |
| 170 | |
| 171 | void |
| 172 | m68k_push_dummy_frame (void) |
| 173 | { |
| 174 | register CORE_ADDR sp = read_register (SP_REGNUM); |
| 175 | register int regnum; |
| 176 | char raw_buffer[12]; |
| 177 | |
| 178 | sp = push_word (sp, read_register (PC_REGNUM)); |
| 179 | sp = push_word (sp, read_register (FP_REGNUM)); |
| 180 | write_register (FP_REGNUM, sp); |
| 181 | |
| 182 | /* Always save the floating-point registers, whether they exist on |
| 183 | this target or not. */ |
| 184 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) |
| 185 | { |
| 186 | read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); |
| 187 | sp = push_bytes (sp, raw_buffer, 12); |
| 188 | } |
| 189 | |
| 190 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) |
| 191 | { |
| 192 | sp = push_word (sp, read_register (regnum)); |
| 193 | } |
| 194 | sp = push_word (sp, read_register (PS_REGNUM)); |
| 195 | write_register (SP_REGNUM, sp); |
| 196 | } |
| 197 | |
| 198 | /* Discard from the stack the innermost frame, |
| 199 | restoring all saved registers. */ |
| 200 | |
| 201 | void |
| 202 | m68k_pop_frame (void) |
| 203 | { |
| 204 | register struct frame_info *frame = get_current_frame (); |
| 205 | register CORE_ADDR fp; |
| 206 | register int regnum; |
| 207 | struct frame_saved_regs fsr; |
| 208 | char raw_buffer[12]; |
| 209 | |
| 210 | fp = FRAME_FP (frame); |
| 211 | get_frame_saved_regs (frame, &fsr); |
| 212 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) |
| 213 | { |
| 214 | if (fsr.regs[regnum]) |
| 215 | { |
| 216 | read_memory (fsr.regs[regnum], raw_buffer, 12); |
| 217 | write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); |
| 218 | } |
| 219 | } |
| 220 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) |
| 221 | { |
| 222 | if (fsr.regs[regnum]) |
| 223 | { |
| 224 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); |
| 225 | } |
| 226 | } |
| 227 | if (fsr.regs[PS_REGNUM]) |
| 228 | { |
| 229 | write_register (PS_REGNUM, |
| 230 | read_memory_integer (fsr.regs[PS_REGNUM], 4)); |
| 231 | } |
| 232 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); |
| 233 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); |
| 234 | write_register (SP_REGNUM, fp + 8); |
| 235 | flush_cached_frames (); |
| 236 | } |
| 237 | \f |
| 238 | |
| 239 | /* Given an ip value corresponding to the start of a function, |
| 240 | return the ip of the first instruction after the function |
| 241 | prologue. This is the generic m68k support. Machines which |
| 242 | require something different can override the SKIP_PROLOGUE |
| 243 | macro to point elsewhere. |
| 244 | |
| 245 | Some instructions which typically may appear in a function |
| 246 | prologue include: |
| 247 | |
| 248 | A link instruction, word form: |
| 249 | |
| 250 | link.w %a6,&0 4e56 XXXX |
| 251 | |
| 252 | A link instruction, long form: |
| 253 | |
| 254 | link.l %fp,&F%1 480e XXXX XXXX |
| 255 | |
| 256 | A movm instruction to preserve integer regs: |
| 257 | |
| 258 | movm.l &M%1,(4,%sp) 48ef XXXX XXXX |
| 259 | |
| 260 | A fmovm instruction to preserve float regs: |
| 261 | |
| 262 | fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX |
| 263 | |
| 264 | Some profiling setup code (FIXME, not recognized yet): |
| 265 | |
| 266 | lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX |
| 267 | bsr _mcount 61ff XXXX XXXX |
| 268 | |
| 269 | */ |
| 270 | |
| 271 | CORE_ADDR |
| 272 | m68k_skip_prologue (CORE_ADDR ip) |
| 273 | { |
| 274 | register CORE_ADDR limit; |
| 275 | struct symtab_and_line sal; |
| 276 | register int op; |
| 277 | |
| 278 | /* Find out if there is a known limit for the extent of the prologue. |
| 279 | If so, ensure we don't go past it. If not, assume "infinity". */ |
| 280 | |
| 281 | sal = find_pc_line (ip, 0); |
| 282 | limit = (sal.end) ? sal.end : (CORE_ADDR) ~0; |
| 283 | |
| 284 | while (ip < limit) |
| 285 | { |
| 286 | op = read_memory_integer (ip, 2); |
| 287 | op &= 0xFFFF; |
| 288 | |
| 289 | if (op == P_LINKW_FP) |
| 290 | ip += 4; /* Skip link.w */ |
| 291 | else if (op == P_PEA_FP) |
| 292 | ip += 2; /* Skip pea %fp */ |
| 293 | else if (op == P_MOVL_SP_FP) |
| 294 | ip += 2; /* Skip move.l %sp, %fp */ |
| 295 | else if (op == P_LINKL_FP) |
| 296 | ip += 6; /* Skip link.l */ |
| 297 | else if (op == P_MOVML) |
| 298 | ip += 6; /* Skip movm.l */ |
| 299 | else if (op == P_FMOVM) |
| 300 | ip += 10; /* Skip fmovm */ |
| 301 | else |
| 302 | break; /* Found unknown code, bail out. */ |
| 303 | } |
| 304 | return (ip); |
| 305 | } |
| 306 | |
| 307 | void |
| 308 | m68k_find_saved_regs (struct frame_info *frame_info, |
| 309 | struct frame_saved_regs *saved_regs) |
| 310 | { |
| 311 | register int regnum; |
| 312 | register int regmask; |
| 313 | register CORE_ADDR next_addr; |
| 314 | register CORE_ADDR pc; |
| 315 | |
| 316 | /* First possible address for a pc in a call dummy for this frame. */ |
| 317 | CORE_ADDR possible_call_dummy_start = |
| 318 | (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 - 8 * 12; |
| 319 | |
| 320 | int nextinsn; |
| 321 | memset (saved_regs, 0, sizeof (*saved_regs)); |
| 322 | if ((frame_info)->pc >= possible_call_dummy_start |
| 323 | && (frame_info)->pc <= (frame_info)->frame) |
| 324 | { |
| 325 | |
| 326 | /* It is a call dummy. We could just stop now, since we know |
| 327 | what the call dummy saves and where. But this code proceeds |
| 328 | to parse the "prologue" which is part of the call dummy. |
| 329 | This is needlessly complex and confusing. FIXME. */ |
| 330 | |
| 331 | next_addr = (frame_info)->frame; |
| 332 | pc = possible_call_dummy_start; |
| 333 | } |
| 334 | else |
| 335 | { |
| 336 | pc = get_pc_function_start ((frame_info)->pc); |
| 337 | |
| 338 | nextinsn = read_memory_integer (pc, 2); |
| 339 | if (P_PEA_FP == nextinsn |
| 340 | && P_MOVL_SP_FP == read_memory_integer (pc + 2, 2)) |
| 341 | { |
| 342 | /* pea %fp |
| 343 | move.l %sp, %fp */ |
| 344 | next_addr = frame_info->frame; |
| 345 | pc += 4; |
| 346 | } |
| 347 | else if (P_LINKL_FP == nextinsn) |
| 348 | /* link.l %fp */ |
| 349 | /* Find the address above the saved |
| 350 | regs using the amount of storage from the link instruction. */ |
| 351 | { |
| 352 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 4); |
| 353 | pc += 6; |
| 354 | } |
| 355 | else if (P_LINKW_FP == nextinsn) |
| 356 | /* link.w %fp */ |
| 357 | /* Find the address above the saved |
| 358 | regs using the amount of storage from the link instruction. */ |
| 359 | { |
| 360 | next_addr = (frame_info)->frame + read_memory_integer (pc + 2, 2); |
| 361 | pc += 4; |
| 362 | } |
| 363 | else |
| 364 | goto lose; |
| 365 | |
| 366 | /* If have an addal #-n, sp next, adjust next_addr. */ |
| 367 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) |
| 368 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; |
| 369 | } |
| 370 | |
| 371 | for (;;) |
| 372 | { |
| 373 | nextinsn = 0xffff & read_memory_integer (pc, 2); |
| 374 | regmask = read_memory_integer (pc + 2, 2); |
| 375 | /* fmovemx to -(sp) */ |
| 376 | if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000) |
| 377 | { |
| 378 | /* Regmask's low bit is for register fp7, the first pushed */ |
| 379 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) |
| 380 | if (regmask & 1) |
| 381 | saved_regs->regs[regnum] = (next_addr -= 12); |
| 382 | pc += 4; |
| 383 | } |
| 384 | /* fmovemx to (fp + displacement) */ |
| 385 | else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000) |
| 386 | { |
| 387 | register CORE_ADDR addr; |
| 388 | |
| 389 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); |
| 390 | /* Regmask's low bit is for register fp7, the first pushed */ |
| 391 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) |
| 392 | if (regmask & 1) |
| 393 | { |
| 394 | saved_regs->regs[regnum] = addr; |
| 395 | addr += 12; |
| 396 | } |
| 397 | pc += 6; |
| 398 | } |
| 399 | /* moveml to (sp) */ |
| 400 | else if (0044327 == nextinsn) |
| 401 | { |
| 402 | /* Regmask's low bit is for register 0, the first written */ |
| 403 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) |
| 404 | if (regmask & 1) |
| 405 | { |
| 406 | saved_regs->regs[regnum] = next_addr; |
| 407 | next_addr += 4; |
| 408 | } |
| 409 | pc += 4; |
| 410 | } |
| 411 | /* moveml to (fp + displacement) */ |
| 412 | else if (0044356 == nextinsn) |
| 413 | { |
| 414 | register CORE_ADDR addr; |
| 415 | |
| 416 | addr = (frame_info)->frame + read_memory_integer (pc + 4, 2); |
| 417 | /* Regmask's low bit is for register 0, the first written */ |
| 418 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) |
| 419 | if (regmask & 1) |
| 420 | { |
| 421 | saved_regs->regs[regnum] = addr; |
| 422 | addr += 4; |
| 423 | } |
| 424 | pc += 6; |
| 425 | } |
| 426 | /* moveml to -(sp) */ |
| 427 | else if (0044347 == nextinsn) |
| 428 | { |
| 429 | /* Regmask's low bit is for register 15, the first pushed */ |
| 430 | for (regnum = 16; --regnum >= 0; regmask >>= 1) |
| 431 | if (regmask & 1) |
| 432 | saved_regs->regs[regnum] = (next_addr -= 4); |
| 433 | pc += 4; |
| 434 | } |
| 435 | /* movl r,-(sp) */ |
| 436 | else if (0x2f00 == (0xfff0 & nextinsn)) |
| 437 | { |
| 438 | regnum = 0xf & nextinsn; |
| 439 | saved_regs->regs[regnum] = (next_addr -= 4); |
| 440 | pc += 2; |
| 441 | } |
| 442 | /* fmovemx to index of sp */ |
| 443 | else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000) |
| 444 | { |
| 445 | /* Regmask's low bit is for register fp0, the first written */ |
| 446 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) |
| 447 | if (regmask & 1) |
| 448 | { |
| 449 | saved_regs->regs[regnum] = next_addr; |
| 450 | next_addr += 12; |
| 451 | } |
| 452 | pc += 10; |
| 453 | } |
| 454 | /* clrw -(sp); movw ccr,-(sp) */ |
| 455 | else if (0x4267 == nextinsn && 0x42e7 == regmask) |
| 456 | { |
| 457 | saved_regs->regs[PS_REGNUM] = (next_addr -= 4); |
| 458 | pc += 4; |
| 459 | } |
| 460 | else |
| 461 | break; |
| 462 | } |
| 463 | lose:; |
| 464 | saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8; |
| 465 | saved_regs->regs[FP_REGNUM] = (frame_info)->frame; |
| 466 | saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4; |
| 467 | #ifdef SIG_SP_FP_OFFSET |
| 468 | /* Adjust saved SP_REGNUM for fake _sigtramp frames. */ |
| 469 | if (frame_info->signal_handler_caller && frame_info->next) |
| 470 | saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET; |
| 471 | #endif |
| 472 | } |
| 473 | |
| 474 | |
| 475 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
| 476 | |
| 477 | #include <sys/procfs.h> |
| 478 | |
| 479 | /* Prototypes for supply_gregset etc. */ |
| 480 | #include "gregset.h" |
| 481 | |
| 482 | /* The /proc interface divides the target machine's register set up into |
| 483 | two different sets, the general register set (gregset) and the floating |
| 484 | point register set (fpregset). For each set, there is an ioctl to get |
| 485 | the current register set and another ioctl to set the current values. |
| 486 | |
| 487 | The actual structure passed through the ioctl interface is, of course, |
| 488 | naturally machine dependent, and is different for each set of registers. |
| 489 | For the m68k for example, the general register set is typically defined |
| 490 | by: |
| 491 | |
| 492 | typedef int gregset_t[18]; |
| 493 | |
| 494 | #define R_D0 0 |
| 495 | ... |
| 496 | #define R_PS 17 |
| 497 | |
| 498 | and the floating point set by: |
| 499 | |
| 500 | typedef struct fpregset { |
| 501 | int f_pcr; |
| 502 | int f_psr; |
| 503 | int f_fpiaddr; |
| 504 | int f_fpregs[8][3]; (8 regs, 96 bits each) |
| 505 | } fpregset_t; |
| 506 | |
| 507 | These routines provide the packing and unpacking of gregset_t and |
| 508 | fpregset_t formatted data. |
| 509 | |
| 510 | */ |
| 511 | |
| 512 | /* Atari SVR4 has R_SR but not R_PS */ |
| 513 | |
| 514 | #if !defined (R_PS) && defined (R_SR) |
| 515 | #define R_PS R_SR |
| 516 | #endif |
| 517 | |
| 518 | /* Given a pointer to a general register set in /proc format (gregset_t *), |
| 519 | unpack the register contents and supply them as gdb's idea of the current |
| 520 | register values. */ |
| 521 | |
| 522 | void |
| 523 | supply_gregset (gregset_t *gregsetp) |
| 524 | { |
| 525 | register int regi; |
| 526 | register greg_t *regp = (greg_t *) gregsetp; |
| 527 | |
| 528 | for (regi = 0; regi < R_PC; regi++) |
| 529 | { |
| 530 | supply_register (regi, (char *) (regp + regi)); |
| 531 | } |
| 532 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); |
| 533 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); |
| 534 | } |
| 535 | |
| 536 | void |
| 537 | fill_gregset (gregset_t *gregsetp, int regno) |
| 538 | { |
| 539 | register int regi; |
| 540 | register greg_t *regp = (greg_t *) gregsetp; |
| 541 | |
| 542 | for (regi = 0; regi < R_PC; regi++) |
| 543 | { |
| 544 | if ((regno == -1) || (regno == regi)) |
| 545 | { |
| 546 | *(regp + regi) = *(int *) ®isters[REGISTER_BYTE (regi)]; |
| 547 | } |
| 548 | } |
| 549 | if ((regno == -1) || (regno == PS_REGNUM)) |
| 550 | { |
| 551 | *(regp + R_PS) = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)]; |
| 552 | } |
| 553 | if ((regno == -1) || (regno == PC_REGNUM)) |
| 554 | { |
| 555 | *(regp + R_PC) = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | #if defined (FP0_REGNUM) |
| 560 | |
| 561 | /* Given a pointer to a floating point register set in /proc format |
| 562 | (fpregset_t *), unpack the register contents and supply them as gdb's |
| 563 | idea of the current floating point register values. */ |
| 564 | |
| 565 | void |
| 566 | supply_fpregset (fpregset_t *fpregsetp) |
| 567 | { |
| 568 | register int regi; |
| 569 | char *from; |
| 570 | |
| 571 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) |
| 572 | { |
| 573 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
| 574 | supply_register (regi, from); |
| 575 | } |
| 576 | supply_register (FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
| 577 | supply_register (FPS_REGNUM, (char *) &(fpregsetp->f_psr)); |
| 578 | supply_register (FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); |
| 579 | } |
| 580 | |
| 581 | /* Given a pointer to a floating point register set in /proc format |
| 582 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
| 583 | of the current floating point register set. If REGNO is -1, update |
| 584 | them all. */ |
| 585 | |
| 586 | void |
| 587 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
| 588 | { |
| 589 | int regi; |
| 590 | char *to; |
| 591 | char *from; |
| 592 | |
| 593 | for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) |
| 594 | { |
| 595 | if ((regno == -1) || (regno == regi)) |
| 596 | { |
| 597 | from = (char *) ®isters[REGISTER_BYTE (regi)]; |
| 598 | to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
| 599 | memcpy (to, from, REGISTER_RAW_SIZE (regi)); |
| 600 | } |
| 601 | } |
| 602 | if ((regno == -1) || (regno == FPC_REGNUM)) |
| 603 | { |
| 604 | fpregsetp->f_pcr = *(int *) ®isters[REGISTER_BYTE (FPC_REGNUM)]; |
| 605 | } |
| 606 | if ((regno == -1) || (regno == FPS_REGNUM)) |
| 607 | { |
| 608 | fpregsetp->f_psr = *(int *) ®isters[REGISTER_BYTE (FPS_REGNUM)]; |
| 609 | } |
| 610 | if ((regno == -1) || (regno == FPI_REGNUM)) |
| 611 | { |
| 612 | fpregsetp->f_fpiaddr = *(int *) ®isters[REGISTER_BYTE (FPI_REGNUM)]; |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | #endif /* defined (FP0_REGNUM) */ |
| 617 | |
| 618 | #endif /* USE_PROC_FS */ |
| 619 | |
| 620 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
| 621 | We expect the first arg to be a pointer to the jmp_buf structure from which |
| 622 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. |
| 623 | This routine returns true on success. */ |
| 624 | |
| 625 | /* NOTE: cagney/2000-11-08: For this function to be fully multi-arched |
| 626 | the macro's JB_PC and JB_ELEMENT_SIZE would need to be moved into |
| 627 | the ``struct gdbarch_tdep'' object and then set on a target ISA/ABI |
| 628 | dependant basis. */ |
| 629 | |
| 630 | int |
| 631 | m68k_get_longjmp_target (CORE_ADDR *pc) |
| 632 | { |
| 633 | #if defined (JB_PC) && defined (JB_ELEMENT_SIZE) |
| 634 | char *buf; |
| 635 | CORE_ADDR sp, jb_addr; |
| 636 | |
| 637 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 638 | sp = read_register (SP_REGNUM); |
| 639 | |
| 640 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
| 641 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 642 | return 0; |
| 643 | |
| 644 | jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 645 | |
| 646 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, |
| 647 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
| 648 | return 0; |
| 649 | |
| 650 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
| 651 | |
| 652 | return 1; |
| 653 | #else |
| 654 | internal_error (__FILE__, __LINE__, |
| 655 | "m68k_get_longjmp_target: not implemented"); |
| 656 | return 0; |
| 657 | #endif |
| 658 | } |
| 659 | |
| 660 | /* Immediately after a function call, return the saved pc before the frame |
| 661 | is setup. For sun3's, we check for the common case of being inside of a |
| 662 | system call, and if so, we know that Sun pushes the call # on the stack |
| 663 | prior to doing the trap. */ |
| 664 | |
| 665 | CORE_ADDR |
| 666 | m68k_saved_pc_after_call (struct frame_info *frame) |
| 667 | { |
| 668 | #ifdef SYSCALL_TRAP |
| 669 | int op; |
| 670 | |
| 671 | op = read_memory_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2); |
| 672 | |
| 673 | if (op == SYSCALL_TRAP) |
| 674 | return read_memory_integer (read_register (SP_REGNUM) + 4, 4); |
| 675 | else |
| 676 | #endif /* SYSCALL_TRAP */ |
| 677 | return read_memory_integer (read_register (SP_REGNUM), 4); |
| 678 | } |
| 679 | |
| 680 | /* Function: m68k_gdbarch_init |
| 681 | Initializer function for the m68k gdbarch vector. |
| 682 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
| 683 | |
| 684 | static struct gdbarch * |
| 685 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 686 | { |
| 687 | struct gdbarch_tdep *tdep = NULL; |
| 688 | struct gdbarch *gdbarch; |
| 689 | |
| 690 | /* find a candidate among the list of pre-declared architectures. */ |
| 691 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 692 | if (arches != NULL) |
| 693 | return (arches->gdbarch); |
| 694 | |
| 695 | #if 0 |
| 696 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); |
| 697 | #endif |
| 698 | |
| 699 | gdbarch = gdbarch_alloc (&info, 0); |
| 700 | |
| 701 | return gdbarch; |
| 702 | } |
| 703 | |
| 704 | |
| 705 | static void |
| 706 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) |
| 707 | { |
| 708 | |
| 709 | } |
| 710 | |
| 711 | void |
| 712 | _initialize_m68k_tdep (void) |
| 713 | { |
| 714 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
| 715 | tm_print_insn = print_insn_m68k; |
| 716 | } |