| 1 | /* Machine-dependent code which would otherwise be in inflow.c and core.c, |
| 2 | for GDB, the GNU debugger. This code is for the HP PA-RISC cpu. |
| 3 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by the Center for Software Science at the |
| 6 | University of Utah (pa-gdb-bugs@cs.utah.edu). |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "frame.h" |
| 26 | #include "inferior.h" |
| 27 | #include "value.h" |
| 28 | |
| 29 | /* For argument passing to the inferior */ |
| 30 | #include "symtab.h" |
| 31 | |
| 32 | #ifdef USG |
| 33 | #include <sys/types.h> |
| 34 | #endif |
| 35 | |
| 36 | #include <sys/param.h> |
| 37 | #include <sys/dir.h> |
| 38 | #include <signal.h> |
| 39 | #include <sys/ioctl.h> |
| 40 | |
| 41 | #ifdef COFF_ENCAPSULATE |
| 42 | #include "a.out.encap.h" |
| 43 | #else |
| 44 | #include <a.out.h> |
| 45 | #endif |
| 46 | #ifndef N_SET_MAGIC |
| 47 | #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val)) |
| 48 | #endif |
| 49 | |
| 50 | /*#include <sys/user.h> After a.out.h */ |
| 51 | #include <sys/file.h> |
| 52 | #include <sys/stat.h> |
| 53 | #include <machine/psl.h> |
| 54 | #include "wait.h" |
| 55 | |
| 56 | #include "gdbcore.h" |
| 57 | #include "gdbcmd.h" |
| 58 | #include "target.h" |
| 59 | #include "symfile.h" |
| 60 | #include "objfiles.h" |
| 61 | |
| 62 | static int restore_pc_queue PARAMS ((struct frame_saved_regs *fsr)); |
| 63 | static int hppa_alignof PARAMS ((struct type *arg)); |
| 64 | static FRAME_ADDR dig_fp_from_stack PARAMS ((FRAME frame, |
| 65 | struct unwind_table_entry *u)); |
| 66 | CORE_ADDR frame_saved_pc PARAMS ((FRAME frame)); |
| 67 | |
| 68 | \f |
| 69 | /* Routines to extract various sized constants out of hppa |
| 70 | instructions. */ |
| 71 | |
| 72 | /* This assumes that no garbage lies outside of the lower bits of |
| 73 | value. */ |
| 74 | |
| 75 | int |
| 76 | sign_extend (val, bits) |
| 77 | unsigned val, bits; |
| 78 | { |
| 79 | return (int)(val >> bits - 1 ? (-1 << bits) | val : val); |
| 80 | } |
| 81 | |
| 82 | /* For many immediate values the sign bit is the low bit! */ |
| 83 | |
| 84 | int |
| 85 | low_sign_extend (val, bits) |
| 86 | unsigned val, bits; |
| 87 | { |
| 88 | return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1); |
| 89 | } |
| 90 | /* extract the immediate field from a ld{bhw}s instruction */ |
| 91 | |
| 92 | unsigned |
| 93 | get_field (val, from, to) |
| 94 | unsigned val, from, to; |
| 95 | { |
| 96 | val = val >> 31 - to; |
| 97 | return val & ((1 << 32 - from) - 1); |
| 98 | } |
| 99 | |
| 100 | unsigned |
| 101 | set_field (val, from, to, new_val) |
| 102 | unsigned *val, from, to; |
| 103 | { |
| 104 | unsigned mask = ~((1 << (to - from + 1)) << (31 - from)); |
| 105 | return *val = *val & mask | (new_val << (31 - from)); |
| 106 | } |
| 107 | |
| 108 | /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */ |
| 109 | |
| 110 | extract_3 (word) |
| 111 | unsigned word; |
| 112 | { |
| 113 | return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17); |
| 114 | } |
| 115 | |
| 116 | extract_5_load (word) |
| 117 | unsigned word; |
| 118 | { |
| 119 | return low_sign_extend (word >> 16 & MASK_5, 5); |
| 120 | } |
| 121 | |
| 122 | /* extract the immediate field from a st{bhw}s instruction */ |
| 123 | |
| 124 | int |
| 125 | extract_5_store (word) |
| 126 | unsigned word; |
| 127 | { |
| 128 | return low_sign_extend (word & MASK_5, 5); |
| 129 | } |
| 130 | |
| 131 | /* extract the immediate field from a break instruction */ |
| 132 | |
| 133 | unsigned |
| 134 | extract_5r_store (word) |
| 135 | unsigned word; |
| 136 | { |
| 137 | return (word & MASK_5); |
| 138 | } |
| 139 | |
| 140 | /* extract the immediate field from a {sr}sm instruction */ |
| 141 | |
| 142 | unsigned |
| 143 | extract_5R_store (word) |
| 144 | unsigned word; |
| 145 | { |
| 146 | return (word >> 16 & MASK_5); |
| 147 | } |
| 148 | |
| 149 | /* extract an 11 bit immediate field */ |
| 150 | |
| 151 | int |
| 152 | extract_11 (word) |
| 153 | unsigned word; |
| 154 | { |
| 155 | return low_sign_extend (word & MASK_11, 11); |
| 156 | } |
| 157 | |
| 158 | /* extract a 14 bit immediate field */ |
| 159 | |
| 160 | int |
| 161 | extract_14 (word) |
| 162 | unsigned word; |
| 163 | { |
| 164 | return low_sign_extend (word & MASK_14, 14); |
| 165 | } |
| 166 | |
| 167 | /* deposit a 14 bit constant in a word */ |
| 168 | |
| 169 | unsigned |
| 170 | deposit_14 (opnd, word) |
| 171 | int opnd; |
| 172 | unsigned word; |
| 173 | { |
| 174 | unsigned sign = (opnd < 0 ? 1 : 0); |
| 175 | |
| 176 | return word | ((unsigned)opnd << 1 & MASK_14) | sign; |
| 177 | } |
| 178 | |
| 179 | /* extract a 21 bit constant */ |
| 180 | |
| 181 | int |
| 182 | extract_21 (word) |
| 183 | unsigned word; |
| 184 | { |
| 185 | int val; |
| 186 | |
| 187 | word &= MASK_21; |
| 188 | word <<= 11; |
| 189 | val = GET_FIELD (word, 20, 20); |
| 190 | val <<= 11; |
| 191 | val |= GET_FIELD (word, 9, 19); |
| 192 | val <<= 2; |
| 193 | val |= GET_FIELD (word, 5, 6); |
| 194 | val <<= 5; |
| 195 | val |= GET_FIELD (word, 0, 4); |
| 196 | val <<= 2; |
| 197 | val |= GET_FIELD (word, 7, 8); |
| 198 | return sign_extend (val, 21) << 11; |
| 199 | } |
| 200 | |
| 201 | /* deposit a 21 bit constant in a word. Although 21 bit constants are |
| 202 | usually the top 21 bits of a 32 bit constant, we assume that only |
| 203 | the low 21 bits of opnd are relevant */ |
| 204 | |
| 205 | unsigned |
| 206 | deposit_21 (opnd, word) |
| 207 | unsigned opnd, word; |
| 208 | { |
| 209 | unsigned val = 0; |
| 210 | |
| 211 | val |= GET_FIELD (opnd, 11 + 14, 11 + 18); |
| 212 | val <<= 2; |
| 213 | val |= GET_FIELD (opnd, 11 + 12, 11 + 13); |
| 214 | val <<= 2; |
| 215 | val |= GET_FIELD (opnd, 11 + 19, 11 + 20); |
| 216 | val <<= 11; |
| 217 | val |= GET_FIELD (opnd, 11 + 1, 11 + 11); |
| 218 | val <<= 1; |
| 219 | val |= GET_FIELD (opnd, 11 + 0, 11 + 0); |
| 220 | return word | val; |
| 221 | } |
| 222 | |
| 223 | /* extract a 12 bit constant from branch instructions */ |
| 224 | |
| 225 | int |
| 226 | extract_12 (word) |
| 227 | unsigned word; |
| 228 | { |
| 229 | return sign_extend (GET_FIELD (word, 19, 28) | |
| 230 | GET_FIELD (word, 29, 29) << 10 | |
| 231 | (word & 0x1) << 11, 12) << 2; |
| 232 | } |
| 233 | |
| 234 | /* extract a 17 bit constant from branch instructions, returning the |
| 235 | 19 bit signed value. */ |
| 236 | |
| 237 | int |
| 238 | extract_17 (word) |
| 239 | unsigned word; |
| 240 | { |
| 241 | return sign_extend (GET_FIELD (word, 19, 28) | |
| 242 | GET_FIELD (word, 29, 29) << 10 | |
| 243 | GET_FIELD (word, 11, 15) << 11 | |
| 244 | (word & 0x1) << 16, 17) << 2; |
| 245 | } |
| 246 | \f |
| 247 | /* Lookup the unwind (stack backtrace) info for the given PC. We search all |
| 248 | of the objfiles seeking the unwind table entry for this PC. Each objfile |
| 249 | contains a sorted list of struct unwind_table_entry. Since we do a binary |
| 250 | search of the unwind tables, we depend upon them to be sorted. */ |
| 251 | |
| 252 | static struct unwind_table_entry * |
| 253 | find_unwind_entry(pc) |
| 254 | CORE_ADDR pc; |
| 255 | { |
| 256 | int first, middle, last; |
| 257 | struct objfile *objfile; |
| 258 | |
| 259 | ALL_OBJFILES (objfile) |
| 260 | { |
| 261 | struct obj_unwind_info *ui; |
| 262 | |
| 263 | ui = OBJ_UNWIND_INFO (objfile); |
| 264 | |
| 265 | if (!ui) |
| 266 | continue; |
| 267 | |
| 268 | /* First, check the cache */ |
| 269 | |
| 270 | if (ui->cache |
| 271 | && pc >= ui->cache->region_start |
| 272 | && pc <= ui->cache->region_end) |
| 273 | return ui->cache; |
| 274 | |
| 275 | /* Not in the cache, do a binary search */ |
| 276 | |
| 277 | first = 0; |
| 278 | last = ui->last; |
| 279 | |
| 280 | while (first <= last) |
| 281 | { |
| 282 | middle = (first + last) / 2; |
| 283 | if (pc >= ui->table[middle].region_start |
| 284 | && pc <= ui->table[middle].region_end) |
| 285 | { |
| 286 | ui->cache = &ui->table[middle]; |
| 287 | return &ui->table[middle]; |
| 288 | } |
| 289 | |
| 290 | if (pc < ui->table[middle].region_start) |
| 291 | last = middle - 1; |
| 292 | else |
| 293 | first = middle + 1; |
| 294 | } |
| 295 | } /* ALL_OBJFILES() */ |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | /* Called when no unwind descriptor was found for PC. Returns 1 if it |
| 300 | appears that PC is in a linker stub. */ |
| 301 | static int pc_in_linker_stub PARAMS ((CORE_ADDR)); |
| 302 | |
| 303 | static int |
| 304 | pc_in_linker_stub (pc) |
| 305 | CORE_ADDR pc; |
| 306 | { |
| 307 | int found_magic_instruction = 0; |
| 308 | int i; |
| 309 | char buf[4]; |
| 310 | |
| 311 | /* If unable to read memory, assume pc is not in a linker stub. */ |
| 312 | if (target_read_memory (pc, buf, 4) != 0) |
| 313 | return 0; |
| 314 | |
| 315 | /* We are looking for something like |
| 316 | |
| 317 | ; $$dyncall jams RP into this special spot in the frame (RP') |
| 318 | ; before calling the "call stub" |
| 319 | ldw -18(sp),rp |
| 320 | |
| 321 | ldsid (rp),r1 ; Get space associated with RP into r1 |
| 322 | mtsp r1,sp ; Move it into space register 0 |
| 323 | be,n 0(sr0),rp) ; back to your regularly scheduled program |
| 324 | */ |
| 325 | |
| 326 | /* Maximum known linker stub size is 4 instructions. Search forward |
| 327 | from the given PC, then backward. */ |
| 328 | for (i = 0; i < 4; i++) |
| 329 | { |
| 330 | /* If we hit something with an unwind, stop searching this direction. */ |
| 331 | |
| 332 | if (find_unwind_entry (pc + i * 4) != 0) |
| 333 | break; |
| 334 | |
| 335 | /* Check for ldsid (rp),r1 which is the magic instruction for a |
| 336 | return from a cross-space function call. */ |
| 337 | if (read_memory_integer (pc + i * 4, 4) == 0x004010a1) |
| 338 | { |
| 339 | found_magic_instruction = 1; |
| 340 | break; |
| 341 | } |
| 342 | /* Add code to handle long call/branch and argument relocation stubs |
| 343 | here. */ |
| 344 | } |
| 345 | |
| 346 | if (found_magic_instruction != 0) |
| 347 | return 1; |
| 348 | |
| 349 | /* Now look backward. */ |
| 350 | for (i = 0; i < 4; i++) |
| 351 | { |
| 352 | /* If we hit something with an unwind, stop searching this direction. */ |
| 353 | |
| 354 | if (find_unwind_entry (pc - i * 4) != 0) |
| 355 | break; |
| 356 | |
| 357 | /* Check for ldsid (rp),r1 which is the magic instruction for a |
| 358 | return from a cross-space function call. */ |
| 359 | if (read_memory_integer (pc - i * 4, 4) == 0x004010a1) |
| 360 | { |
| 361 | found_magic_instruction = 1; |
| 362 | break; |
| 363 | } |
| 364 | /* Add code to handle long call/branch and argument relocation stubs |
| 365 | here. */ |
| 366 | } |
| 367 | return found_magic_instruction; |
| 368 | } |
| 369 | |
| 370 | static int |
| 371 | find_return_regnum(pc) |
| 372 | CORE_ADDR pc; |
| 373 | { |
| 374 | struct unwind_table_entry *u; |
| 375 | |
| 376 | u = find_unwind_entry (pc); |
| 377 | |
| 378 | if (!u) |
| 379 | return RP_REGNUM; |
| 380 | |
| 381 | if (u->Millicode) |
| 382 | return 31; |
| 383 | |
| 384 | return RP_REGNUM; |
| 385 | } |
| 386 | |
| 387 | /* Return size of frame, or -1 if we should use a frame pointer. */ |
| 388 | int |
| 389 | find_proc_framesize(pc) |
| 390 | CORE_ADDR pc; |
| 391 | { |
| 392 | struct unwind_table_entry *u; |
| 393 | |
| 394 | u = find_unwind_entry (pc); |
| 395 | |
| 396 | if (!u) |
| 397 | { |
| 398 | if (pc_in_linker_stub (pc)) |
| 399 | /* Linker stubs have a zero size frame. */ |
| 400 | return 0; |
| 401 | else |
| 402 | return -1; |
| 403 | } |
| 404 | |
| 405 | if (u->Save_SP) |
| 406 | /* If this bit is set, it means there is a frame pointer and we should |
| 407 | use it. */ |
| 408 | return -1; |
| 409 | |
| 410 | return u->Total_frame_size << 3; |
| 411 | } |
| 412 | |
| 413 | /* Return offset from sp at which rp is saved, or 0 if not saved. */ |
| 414 | static int rp_saved PARAMS ((CORE_ADDR)); |
| 415 | |
| 416 | static int |
| 417 | rp_saved (pc) |
| 418 | CORE_ADDR pc; |
| 419 | { |
| 420 | struct unwind_table_entry *u; |
| 421 | |
| 422 | u = find_unwind_entry (pc); |
| 423 | |
| 424 | if (!u) |
| 425 | { |
| 426 | if (pc_in_linker_stub (pc)) |
| 427 | /* This is the so-called RP'. */ |
| 428 | return -24; |
| 429 | else |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | if (u->Save_RP) |
| 434 | return -20; |
| 435 | else |
| 436 | return 0; |
| 437 | } |
| 438 | \f |
| 439 | int |
| 440 | frameless_function_invocation (frame) |
| 441 | FRAME frame; |
| 442 | { |
| 443 | struct unwind_table_entry *u; |
| 444 | |
| 445 | u = find_unwind_entry (frame->pc); |
| 446 | |
| 447 | if (u == 0) |
| 448 | return frameless_look_for_prologue (frame); |
| 449 | |
| 450 | return (u->Total_frame_size == 0); |
| 451 | } |
| 452 | |
| 453 | CORE_ADDR |
| 454 | saved_pc_after_call (frame) |
| 455 | FRAME frame; |
| 456 | { |
| 457 | int ret_regnum; |
| 458 | |
| 459 | ret_regnum = find_return_regnum (get_frame_pc (frame)); |
| 460 | |
| 461 | return read_register (ret_regnum) & ~0x3; |
| 462 | } |
| 463 | \f |
| 464 | CORE_ADDR |
| 465 | frame_saved_pc (frame) |
| 466 | FRAME frame; |
| 467 | { |
| 468 | CORE_ADDR pc = get_frame_pc (frame); |
| 469 | |
| 470 | if (frameless_function_invocation (frame)) |
| 471 | { |
| 472 | int ret_regnum; |
| 473 | |
| 474 | ret_regnum = find_return_regnum (pc); |
| 475 | |
| 476 | return read_register (ret_regnum) & ~0x3; |
| 477 | } |
| 478 | else |
| 479 | { |
| 480 | int rp_offset = rp_saved (pc); |
| 481 | |
| 482 | if (rp_offset == 0) |
| 483 | return read_register (RP_REGNUM) & ~0x3; |
| 484 | else |
| 485 | return read_memory_integer (frame->frame + rp_offset, 4) & ~0x3; |
| 486 | } |
| 487 | } |
| 488 | \f |
| 489 | /* We need to correct the PC and the FP for the outermost frame when we are |
| 490 | in a system call. */ |
| 491 | |
| 492 | void |
| 493 | init_extra_frame_info (fromleaf, frame) |
| 494 | int fromleaf; |
| 495 | struct frame_info *frame; |
| 496 | { |
| 497 | int flags; |
| 498 | int framesize; |
| 499 | |
| 500 | if (frame->next) /* Only do this for outermost frame */ |
| 501 | return; |
| 502 | |
| 503 | flags = read_register (FLAGS_REGNUM); |
| 504 | if (flags & 2) /* In system call? */ |
| 505 | frame->pc = read_register (31) & ~0x3; |
| 506 | |
| 507 | /* The outermost frame is always derived from PC-framesize */ |
| 508 | framesize = find_proc_framesize(frame->pc); |
| 509 | if (framesize == -1) |
| 510 | frame->frame = read_register (FP_REGNUM); |
| 511 | else |
| 512 | frame->frame = read_register (SP_REGNUM) - framesize; |
| 513 | |
| 514 | if (!frameless_function_invocation (frame)) /* Frameless? */ |
| 515 | return; /* No, quit now */ |
| 516 | |
| 517 | /* For frameless functions, we need to look at the caller's frame */ |
| 518 | framesize = find_proc_framesize(FRAME_SAVED_PC(frame)); |
| 519 | if (framesize != -1) |
| 520 | frame->frame -= framesize; |
| 521 | } |
| 522 | \f |
| 523 | /* Given a GDB frame, determine the address of the calling function's frame. |
| 524 | This will be used to create a new GDB frame struct, and then |
| 525 | INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. |
| 526 | |
| 527 | This may involve searching through prologues for several functions |
| 528 | at boundaries where GCC calls HP C code, or where code which has |
| 529 | a frame pointer calls code without a frame pointer. */ |
| 530 | |
| 531 | |
| 532 | FRAME_ADDR |
| 533 | frame_chain (frame) |
| 534 | struct frame_info *frame; |
| 535 | { |
| 536 | int my_framesize, caller_framesize; |
| 537 | struct unwind_table_entry *u; |
| 538 | |
| 539 | /* Get frame sizes for the current frame and the frame of the |
| 540 | caller. */ |
| 541 | my_framesize = find_proc_framesize (frame->pc); |
| 542 | caller_framesize = find_proc_framesize (FRAME_SAVED_PC(frame)); |
| 543 | |
| 544 | /* If caller does not have a frame pointer, then its frame |
| 545 | can be found at current_frame - caller_framesize. */ |
| 546 | if (caller_framesize != -1) |
| 547 | return frame->frame - caller_framesize; |
| 548 | |
| 549 | /* Both caller and callee have frame pointers and are GCC compiled |
| 550 | (SAVE_SP bit in unwind descriptor is on for both functions. |
| 551 | The previous frame pointer is found at the top of the current frame. */ |
| 552 | if (caller_framesize == -1 && my_framesize == -1) |
| 553 | return read_memory_integer (frame->frame, 4); |
| 554 | |
| 555 | /* Caller has a frame pointer, but callee does not. This is a little |
| 556 | more difficult as GCC and HP C lay out locals and callee register save |
| 557 | areas very differently. |
| 558 | |
| 559 | The previous frame pointer could be in a register, or in one of |
| 560 | several areas on the stack. |
| 561 | |
| 562 | Walk from the current frame to the innermost frame examining |
| 563 | unwind descriptors to determine if %r4 ever gets saved into the |
| 564 | stack. If so return whatever value got saved into the stack. |
| 565 | If it was never saved in the stack, then the value in %r4 is still |
| 566 | valid, so use it. |
| 567 | |
| 568 | We use information from unwind descriptors to determine if %r4 |
| 569 | is saved into the stack (Entry_GR field has this information). */ |
| 570 | |
| 571 | while (frame) |
| 572 | { |
| 573 | u = find_unwind_entry (frame->pc); |
| 574 | |
| 575 | if (!u) |
| 576 | { |
| 577 | /* We could find this information by examining prologues. I don't |
| 578 | think anyone has actually written any tools (not even "strip") |
| 579 | which leave them out of an executable, so maybe this is a moot |
| 580 | point. */ |
| 581 | warning ("Unable to find unwind for PC 0x%x -- Help!", frame->pc); |
| 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | /* Entry_GR specifies the number of callee-saved general registers |
| 586 | saved in the stack. It starts at %r3, so %r4 would be 2. */ |
| 587 | if (u->Entry_GR >= 2 || u->Save_SP) |
| 588 | break; |
| 589 | else |
| 590 | frame = frame->next; |
| 591 | } |
| 592 | |
| 593 | if (frame) |
| 594 | { |
| 595 | /* We may have walked down the chain into a function with a frame |
| 596 | pointer. */ |
| 597 | if (u->Save_SP) |
| 598 | return read_memory_integer (frame->frame, 4); |
| 599 | /* %r4 was saved somewhere in the stack. Dig it out. */ |
| 600 | else |
| 601 | return dig_fp_from_stack (frame, u); |
| 602 | } |
| 603 | else |
| 604 | { |
| 605 | /* The value in %r4 was never saved into the stack (thus %r4 still |
| 606 | holds the value of the previous frame pointer). */ |
| 607 | return read_register (4); |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | /* Given a frame and an unwind descriptor return the value for %fr (aka fp) |
| 612 | which was saved into the stack. FIXME: Why can't we just use the standard |
| 613 | saved_regs stuff? */ |
| 614 | |
| 615 | static FRAME_ADDR |
| 616 | dig_fp_from_stack (frame, u) |
| 617 | FRAME frame; |
| 618 | struct unwind_table_entry *u; |
| 619 | { |
| 620 | CORE_ADDR pc = u->region_start; |
| 621 | |
| 622 | /* Search the function for the save of %r4. */ |
| 623 | while (pc != u->region_end) |
| 624 | { |
| 625 | char buf[4]; |
| 626 | unsigned long inst; |
| 627 | int status; |
| 628 | |
| 629 | /* We need only look for the standard stw %r4,X(%sp) instruction, |
| 630 | the other variants (eg stwm) are only used on the first register |
| 631 | save (eg %r3). */ |
| 632 | status = target_read_memory (pc, buf, 4); |
| 633 | inst = extract_unsigned_integer (buf, 4); |
| 634 | |
| 635 | if (status != 0) |
| 636 | memory_error (status, pc); |
| 637 | |
| 638 | /* Check for stw %r4,X(%sp). */ |
| 639 | if ((inst & 0xffffc000) == 0x6bc40000) |
| 640 | { |
| 641 | /* Found the instruction which saves %r4. The offset (relative |
| 642 | to this frame) is framesize + immed14 (derived from the |
| 643 | store instruction). */ |
| 644 | int offset = (u->Total_frame_size << 3) + extract_14 (inst); |
| 645 | |
| 646 | return read_memory_integer (frame->frame + offset, 4); |
| 647 | } |
| 648 | |
| 649 | /* Keep looking. */ |
| 650 | pc += 4; |
| 651 | } |
| 652 | |
| 653 | warning ("Unable to find %%r4 in stack.\n"); |
| 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | \f |
| 658 | /* To see if a frame chain is valid, see if the caller looks like it |
| 659 | was compiled with gcc. */ |
| 660 | |
| 661 | int |
| 662 | frame_chain_valid (chain, thisframe) |
| 663 | FRAME_ADDR chain; |
| 664 | FRAME thisframe; |
| 665 | { |
| 666 | struct minimal_symbol *msym_us; |
| 667 | struct minimal_symbol *msym_start; |
| 668 | struct unwind_table_entry *u; |
| 669 | |
| 670 | if (!chain) |
| 671 | return 0; |
| 672 | |
| 673 | u = find_unwind_entry (thisframe->pc); |
| 674 | |
| 675 | /* We can't just check that the same of msym_us is "_start", because |
| 676 | someone idiotically decided that they were going to make a Ltext_end |
| 677 | symbol with the same address. This Ltext_end symbol is totally |
| 678 | indistinguishable (as nearly as I can tell) from the symbol for a function |
| 679 | which is (legitimately, since it is in the user's namespace) |
| 680 | named Ltext_end, so we can't just ignore it. */ |
| 681 | msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe)); |
| 682 | msym_start = lookup_minimal_symbol ("_start", NULL); |
| 683 | if (msym_us |
| 684 | && msym_start |
| 685 | && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start)) |
| 686 | return 0; |
| 687 | |
| 688 | if (u == NULL) |
| 689 | return 1; |
| 690 | |
| 691 | if (u->Save_SP || u->Total_frame_size) |
| 692 | return 1; |
| 693 | |
| 694 | if (pc_in_linker_stub (thisframe->pc)) |
| 695 | return 1; |
| 696 | |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * These functions deal with saving and restoring register state |
| 702 | * around a function call in the inferior. They keep the stack |
| 703 | * double-word aligned; eventually, on an hp700, the stack will have |
| 704 | * to be aligned to a 64-byte boundary. |
| 705 | */ |
| 706 | |
| 707 | int |
| 708 | push_dummy_frame () |
| 709 | { |
| 710 | register CORE_ADDR sp; |
| 711 | register int regnum; |
| 712 | int int_buffer; |
| 713 | double freg_buffer; |
| 714 | |
| 715 | /* Space for "arguments"; the RP goes in here. */ |
| 716 | sp = read_register (SP_REGNUM) + 48; |
| 717 | int_buffer = read_register (RP_REGNUM) | 0x3; |
| 718 | write_memory (sp - 20, (char *)&int_buffer, 4); |
| 719 | |
| 720 | int_buffer = read_register (FP_REGNUM); |
| 721 | write_memory (sp, (char *)&int_buffer, 4); |
| 722 | |
| 723 | write_register (FP_REGNUM, sp); |
| 724 | |
| 725 | sp += 8; |
| 726 | |
| 727 | for (regnum = 1; regnum < 32; regnum++) |
| 728 | if (regnum != RP_REGNUM && regnum != FP_REGNUM) |
| 729 | sp = push_word (sp, read_register (regnum)); |
| 730 | |
| 731 | sp += 4; |
| 732 | |
| 733 | for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) |
| 734 | { |
| 735 | read_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); |
| 736 | sp = push_bytes (sp, (char *)&freg_buffer, 8); |
| 737 | } |
| 738 | sp = push_word (sp, read_register (IPSW_REGNUM)); |
| 739 | sp = push_word (sp, read_register (SAR_REGNUM)); |
| 740 | sp = push_word (sp, read_register (PCOQ_HEAD_REGNUM)); |
| 741 | sp = push_word (sp, read_register (PCSQ_HEAD_REGNUM)); |
| 742 | sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM)); |
| 743 | sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM)); |
| 744 | write_register (SP_REGNUM, sp); |
| 745 | } |
| 746 | |
| 747 | find_dummy_frame_regs (frame, frame_saved_regs) |
| 748 | struct frame_info *frame; |
| 749 | struct frame_saved_regs *frame_saved_regs; |
| 750 | { |
| 751 | CORE_ADDR fp = frame->frame; |
| 752 | int i; |
| 753 | |
| 754 | frame_saved_regs->regs[RP_REGNUM] = fp - 20 & ~0x3; |
| 755 | frame_saved_regs->regs[FP_REGNUM] = fp; |
| 756 | frame_saved_regs->regs[1] = fp + 8; |
| 757 | |
| 758 | for (fp += 12, i = 3; i < 32; i++) |
| 759 | { |
| 760 | if (i != FP_REGNUM) |
| 761 | { |
| 762 | frame_saved_regs->regs[i] = fp; |
| 763 | fp += 4; |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | fp += 4; |
| 768 | for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8) |
| 769 | frame_saved_regs->regs[i] = fp; |
| 770 | |
| 771 | frame_saved_regs->regs[IPSW_REGNUM] = fp; |
| 772 | frame_saved_regs->regs[SAR_REGNUM] = fp + 4; |
| 773 | frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 8; |
| 774 | frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 12; |
| 775 | frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 16; |
| 776 | frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 20; |
| 777 | } |
| 778 | |
| 779 | int |
| 780 | hppa_pop_frame () |
| 781 | { |
| 782 | register FRAME frame = get_current_frame (); |
| 783 | register CORE_ADDR fp; |
| 784 | register int regnum; |
| 785 | struct frame_saved_regs fsr; |
| 786 | struct frame_info *fi; |
| 787 | double freg_buffer; |
| 788 | |
| 789 | fi = get_frame_info (frame); |
| 790 | fp = fi->frame; |
| 791 | get_frame_saved_regs (fi, &fsr); |
| 792 | |
| 793 | if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */ |
| 794 | restore_pc_queue (&fsr); |
| 795 | |
| 796 | for (regnum = 31; regnum > 0; regnum--) |
| 797 | if (fsr.regs[regnum]) |
| 798 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); |
| 799 | |
| 800 | for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--) |
| 801 | if (fsr.regs[regnum]) |
| 802 | { |
| 803 | read_memory (fsr.regs[regnum], (char *)&freg_buffer, 8); |
| 804 | write_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8); |
| 805 | } |
| 806 | |
| 807 | if (fsr.regs[IPSW_REGNUM]) |
| 808 | write_register (IPSW_REGNUM, |
| 809 | read_memory_integer (fsr.regs[IPSW_REGNUM], 4)); |
| 810 | |
| 811 | if (fsr.regs[SAR_REGNUM]) |
| 812 | write_register (SAR_REGNUM, |
| 813 | read_memory_integer (fsr.regs[SAR_REGNUM], 4)); |
| 814 | |
| 815 | /* If the PC was explicitly saved, then just restore it. */ |
| 816 | if (fsr.regs[PCOQ_TAIL_REGNUM]) |
| 817 | write_register (PCOQ_TAIL_REGNUM, |
| 818 | read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4)); |
| 819 | |
| 820 | /* Else use the value in %rp to set the new PC. */ |
| 821 | else |
| 822 | target_write_pc (read_register (RP_REGNUM)); |
| 823 | |
| 824 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); |
| 825 | |
| 826 | if (fsr.regs[IPSW_REGNUM]) /* call dummy */ |
| 827 | write_register (SP_REGNUM, fp - 48); |
| 828 | else |
| 829 | write_register (SP_REGNUM, fp); |
| 830 | |
| 831 | flush_cached_frames (); |
| 832 | set_current_frame (create_new_frame (read_register (FP_REGNUM), |
| 833 | read_pc ())); |
| 834 | } |
| 835 | |
| 836 | /* |
| 837 | * After returning to a dummy on the stack, restore the instruction |
| 838 | * queue space registers. */ |
| 839 | |
| 840 | static int |
| 841 | restore_pc_queue (fsr) |
| 842 | struct frame_saved_regs *fsr; |
| 843 | { |
| 844 | CORE_ADDR pc = read_pc (); |
| 845 | CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4); |
| 846 | int pid; |
| 847 | WAITTYPE w; |
| 848 | int insn_count; |
| 849 | |
| 850 | /* Advance past break instruction in the call dummy. */ |
| 851 | write_register (PCOQ_HEAD_REGNUM, pc + 4); |
| 852 | write_register (PCOQ_TAIL_REGNUM, pc + 8); |
| 853 | |
| 854 | /* |
| 855 | * HPUX doesn't let us set the space registers or the space |
| 856 | * registers of the PC queue through ptrace. Boo, hiss. |
| 857 | * Conveniently, the call dummy has this sequence of instructions |
| 858 | * after the break: |
| 859 | * mtsp r21, sr0 |
| 860 | * ble,n 0(sr0, r22) |
| 861 | * |
| 862 | * So, load up the registers and single step until we are in the |
| 863 | * right place. |
| 864 | */ |
| 865 | |
| 866 | write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4)); |
| 867 | write_register (22, new_pc); |
| 868 | |
| 869 | for (insn_count = 0; insn_count < 3; insn_count++) |
| 870 | { |
| 871 | resume (1, 0); |
| 872 | target_wait(&w); |
| 873 | |
| 874 | if (!WIFSTOPPED (w)) |
| 875 | { |
| 876 | stop_signal = WTERMSIG (w); |
| 877 | terminal_ours_for_output (); |
| 878 | printf ("\nProgram terminated with signal %d, %s\n", |
| 879 | stop_signal, safe_strsignal (stop_signal)); |
| 880 | fflush (stdout); |
| 881 | return 0; |
| 882 | } |
| 883 | } |
| 884 | fetch_inferior_registers (-1); |
| 885 | return 1; |
| 886 | } |
| 887 | |
| 888 | CORE_ADDR |
| 889 | hppa_push_arguments (nargs, args, sp, struct_return, struct_addr) |
| 890 | int nargs; |
| 891 | value *args; |
| 892 | CORE_ADDR sp; |
| 893 | int struct_return; |
| 894 | CORE_ADDR struct_addr; |
| 895 | { |
| 896 | /* array of arguments' offsets */ |
| 897 | int *offset = (int *)alloca(nargs * sizeof (int)); |
| 898 | int cum = 0; |
| 899 | int i, alignment; |
| 900 | |
| 901 | for (i = 0; i < nargs; i++) |
| 902 | { |
| 903 | /* Coerce chars to int & float to double if necessary */ |
| 904 | args[i] = value_arg_coerce (args[i]); |
| 905 | |
| 906 | cum += TYPE_LENGTH (VALUE_TYPE (args[i])); |
| 907 | |
| 908 | /* value must go at proper alignment. Assume alignment is a |
| 909 | power of two.*/ |
| 910 | alignment = hppa_alignof (VALUE_TYPE (args[i])); |
| 911 | if (cum % alignment) |
| 912 | cum = (cum + alignment) & -alignment; |
| 913 | offset[i] = -cum; |
| 914 | } |
| 915 | sp += max ((cum + 7) & -8, 16); |
| 916 | |
| 917 | for (i = 0; i < nargs; i++) |
| 918 | write_memory (sp + offset[i], VALUE_CONTENTS (args[i]), |
| 919 | TYPE_LENGTH (VALUE_TYPE (args[i]))); |
| 920 | |
| 921 | if (struct_return) |
| 922 | write_register (28, struct_addr); |
| 923 | return sp + 32; |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * Insert the specified number of args and function address |
| 928 | * into a call sequence of the above form stored at DUMMYNAME. |
| 929 | * |
| 930 | * On the hppa we need to call the stack dummy through $$dyncall. |
| 931 | * Therefore our version of FIX_CALL_DUMMY takes an extra argument, |
| 932 | * real_pc, which is the location where gdb should start up the |
| 933 | * inferior to do the function call. |
| 934 | */ |
| 935 | |
| 936 | CORE_ADDR |
| 937 | hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p) |
| 938 | REGISTER_TYPE *dummy; |
| 939 | CORE_ADDR pc; |
| 940 | CORE_ADDR fun; |
| 941 | int nargs; |
| 942 | value *args; |
| 943 | struct type *type; |
| 944 | int gcc_p; |
| 945 | { |
| 946 | CORE_ADDR dyncall_addr, sr4export_addr; |
| 947 | struct minimal_symbol *msymbol; |
| 948 | int flags = read_register (FLAGS_REGNUM); |
| 949 | |
| 950 | msymbol = lookup_minimal_symbol ("$$dyncall", (struct objfile *) NULL); |
| 951 | if (msymbol == NULL) |
| 952 | error ("Can't find an address for $$dyncall trampoline"); |
| 953 | |
| 954 | dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 955 | |
| 956 | msymbol = lookup_minimal_symbol ("_sr4export", (struct objfile *) NULL); |
| 957 | if (msymbol == NULL) |
| 958 | error ("Can't find an address for _sr4export trampoline"); |
| 959 | |
| 960 | sr4export_addr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 961 | |
| 962 | dummy[9] = deposit_21 (fun >> 11, dummy[9]); |
| 963 | dummy[10] = deposit_14 (fun & MASK_11, dummy[10]); |
| 964 | dummy[12] = deposit_21 (sr4export_addr >> 11, dummy[12]); |
| 965 | dummy[13] = deposit_14 (sr4export_addr & MASK_11, dummy[13]); |
| 966 | |
| 967 | write_register (22, pc); |
| 968 | |
| 969 | /* If we are in a syscall, then we should call the stack dummy |
| 970 | directly. $$dyncall is not needed as the kernel sets up the |
| 971 | space id registers properly based on the value in %r31. In |
| 972 | fact calling $$dyncall will not work because the value in %r22 |
| 973 | will be clobbered on the syscall exit path. */ |
| 974 | if (flags & 2) |
| 975 | return pc; |
| 976 | else |
| 977 | return dyncall_addr; |
| 978 | |
| 979 | } |
| 980 | |
| 981 | /* Get the PC from %r31 if currently in a syscall. Also mask out privilege |
| 982 | bits. */ |
| 983 | CORE_ADDR |
| 984 | target_read_pc () |
| 985 | { |
| 986 | int flags = read_register (FLAGS_REGNUM); |
| 987 | |
| 988 | if (flags & 2) |
| 989 | return read_register (31) & ~0x3; |
| 990 | return read_register (PC_REGNUM) & ~0x3; |
| 991 | } |
| 992 | |
| 993 | /* Write out the PC. If currently in a syscall, then also write the new |
| 994 | PC value into %r31. */ |
| 995 | void |
| 996 | target_write_pc (v) |
| 997 | CORE_ADDR v; |
| 998 | { |
| 999 | int flags = read_register (FLAGS_REGNUM); |
| 1000 | |
| 1001 | /* If in a syscall, then set %r31. Also make sure to get the |
| 1002 | privilege bits set correctly. */ |
| 1003 | if (flags & 2) |
| 1004 | write_register (31, (long) (v | 0x3)); |
| 1005 | |
| 1006 | write_register (PC_REGNUM, (long) v); |
| 1007 | write_register (NPC_REGNUM, (long) v + 4); |
| 1008 | } |
| 1009 | |
| 1010 | /* return the alignment of a type in bytes. Structures have the maximum |
| 1011 | alignment required by their fields. */ |
| 1012 | |
| 1013 | static int |
| 1014 | hppa_alignof (arg) |
| 1015 | struct type *arg; |
| 1016 | { |
| 1017 | int max_align, align, i; |
| 1018 | switch (TYPE_CODE (arg)) |
| 1019 | { |
| 1020 | case TYPE_CODE_PTR: |
| 1021 | case TYPE_CODE_INT: |
| 1022 | case TYPE_CODE_FLT: |
| 1023 | return TYPE_LENGTH (arg); |
| 1024 | case TYPE_CODE_ARRAY: |
| 1025 | return hppa_alignof (TYPE_FIELD_TYPE (arg, 0)); |
| 1026 | case TYPE_CODE_STRUCT: |
| 1027 | case TYPE_CODE_UNION: |
| 1028 | max_align = 2; |
| 1029 | for (i = 0; i < TYPE_NFIELDS (arg); i++) |
| 1030 | { |
| 1031 | /* Bit fields have no real alignment. */ |
| 1032 | if (!TYPE_FIELD_BITPOS (arg, i)) |
| 1033 | { |
| 1034 | align = hppa_alignof (TYPE_FIELD_TYPE (arg, i)); |
| 1035 | max_align = max (max_align, align); |
| 1036 | } |
| 1037 | } |
| 1038 | return max_align; |
| 1039 | default: |
| 1040 | return 4; |
| 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | /* Print the register regnum, or all registers if regnum is -1 */ |
| 1045 | |
| 1046 | pa_do_registers_info (regnum, fpregs) |
| 1047 | int regnum; |
| 1048 | int fpregs; |
| 1049 | { |
| 1050 | char raw_regs [REGISTER_BYTES]; |
| 1051 | int i; |
| 1052 | |
| 1053 | for (i = 0; i < NUM_REGS; i++) |
| 1054 | read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i)); |
| 1055 | if (regnum == -1) |
| 1056 | pa_print_registers (raw_regs, regnum, fpregs); |
| 1057 | else if (regnum < FP0_REGNUM) |
| 1058 | printf ("%s %x\n", reg_names[regnum], *(long *)(raw_regs + |
| 1059 | REGISTER_BYTE (regnum))); |
| 1060 | else |
| 1061 | pa_print_fp_reg (regnum); |
| 1062 | } |
| 1063 | |
| 1064 | pa_print_registers (raw_regs, regnum, fpregs) |
| 1065 | char *raw_regs; |
| 1066 | int regnum; |
| 1067 | int fpregs; |
| 1068 | { |
| 1069 | int i; |
| 1070 | |
| 1071 | for (i = 0; i < 18; i++) |
| 1072 | printf ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n", |
| 1073 | reg_names[i], |
| 1074 | *(int *)(raw_regs + REGISTER_BYTE (i)), |
| 1075 | reg_names[i + 18], |
| 1076 | *(int *)(raw_regs + REGISTER_BYTE (i + 18)), |
| 1077 | reg_names[i + 36], |
| 1078 | *(int *)(raw_regs + REGISTER_BYTE (i + 36)), |
| 1079 | reg_names[i + 54], |
| 1080 | *(int *)(raw_regs + REGISTER_BYTE (i + 54))); |
| 1081 | |
| 1082 | if (fpregs) |
| 1083 | for (i = 72; i < NUM_REGS; i++) |
| 1084 | pa_print_fp_reg (i); |
| 1085 | } |
| 1086 | |
| 1087 | pa_print_fp_reg (i) |
| 1088 | int i; |
| 1089 | { |
| 1090 | unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE]; |
| 1091 | unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; |
| 1092 | REGISTER_TYPE val; |
| 1093 | |
| 1094 | /* Get the data in raw format, then convert also to virtual format. */ |
| 1095 | read_relative_register_raw_bytes (i, raw_buffer); |
| 1096 | REGISTER_CONVERT_TO_VIRTUAL (i, raw_buffer, virtual_buffer); |
| 1097 | |
| 1098 | fputs_filtered (reg_names[i], stdout); |
| 1099 | print_spaces_filtered (15 - strlen (reg_names[i]), stdout); |
| 1100 | |
| 1101 | val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, stdout, 0, |
| 1102 | 1, 0, Val_pretty_default); |
| 1103 | printf_filtered ("\n"); |
| 1104 | } |
| 1105 | |
| 1106 | /* Function calls that pass into a new compilation unit must pass through a |
| 1107 | small piece of code that does long format (`external' in HPPA parlance) |
| 1108 | jumps. We figure out where the trampoline is going to end up, and return |
| 1109 | the PC of the final destination. If we aren't in a trampoline, we just |
| 1110 | return NULL. |
| 1111 | |
| 1112 | For computed calls, we just extract the new PC from r22. */ |
| 1113 | |
| 1114 | CORE_ADDR |
| 1115 | skip_trampoline_code (pc, name) |
| 1116 | CORE_ADDR pc; |
| 1117 | char *name; |
| 1118 | { |
| 1119 | long inst0, inst1; |
| 1120 | static CORE_ADDR dyncall = 0; |
| 1121 | struct minimal_symbol *msym; |
| 1122 | |
| 1123 | /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */ |
| 1124 | |
| 1125 | if (!dyncall) |
| 1126 | { |
| 1127 | msym = lookup_minimal_symbol ("$$dyncall", NULL); |
| 1128 | if (msym) |
| 1129 | dyncall = SYMBOL_VALUE_ADDRESS (msym); |
| 1130 | else |
| 1131 | dyncall = -1; |
| 1132 | } |
| 1133 | |
| 1134 | if (pc == dyncall) |
| 1135 | return (CORE_ADDR)(read_register (22) & ~0x3); |
| 1136 | |
| 1137 | inst0 = read_memory_integer (pc, 4); |
| 1138 | inst1 = read_memory_integer (pc+4, 4); |
| 1139 | |
| 1140 | if ( (inst0 & 0xffe00000) == 0x20200000 /* ldil xxx, r1 */ |
| 1141 | && (inst1 & 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */ |
| 1142 | pc = extract_21 (inst0) + extract_17 (inst1); |
| 1143 | else |
| 1144 | pc = (CORE_ADDR)NULL; |
| 1145 | |
| 1146 | return pc; |
| 1147 | } |
| 1148 | |
| 1149 | /* Advance PC across any function entry prologue instructions |
| 1150 | to reach some "real" code. */ |
| 1151 | |
| 1152 | /* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp) |
| 1153 | for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */ |
| 1154 | |
| 1155 | CORE_ADDR |
| 1156 | skip_prologue(pc) |
| 1157 | CORE_ADDR pc; |
| 1158 | { |
| 1159 | char buf[4]; |
| 1160 | unsigned long inst; |
| 1161 | int status; |
| 1162 | |
| 1163 | status = target_read_memory (pc, buf, 4); |
| 1164 | inst = extract_unsigned_integer (buf, 4); |
| 1165 | if (status != 0) |
| 1166 | return pc; |
| 1167 | |
| 1168 | if (inst == 0x6BC23FD9) /* stw rp,-20(sp) */ |
| 1169 | { |
| 1170 | if (read_memory_integer (pc + 4, 4) == 0x8040241) /* copy r4,r1 */ |
| 1171 | pc += 16; |
| 1172 | else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */ |
| 1173 | pc += 8; |
| 1174 | } |
| 1175 | else if (read_memory_integer (pc, 4) == 0x8040241) /* copy r4,r1 */ |
| 1176 | pc += 12; |
| 1177 | else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */ |
| 1178 | pc += 4; |
| 1179 | |
| 1180 | return pc; |
| 1181 | } |
| 1182 | |
| 1183 | #ifdef MAINTENANCE_CMDS |
| 1184 | |
| 1185 | static void |
| 1186 | unwind_command (exp, from_tty) |
| 1187 | char *exp; |
| 1188 | int from_tty; |
| 1189 | { |
| 1190 | CORE_ADDR address; |
| 1191 | union |
| 1192 | { |
| 1193 | int *foo; |
| 1194 | struct unwind_table_entry *u; |
| 1195 | } xxx; |
| 1196 | |
| 1197 | /* If we have an expression, evaluate it and use it as the address. */ |
| 1198 | |
| 1199 | if (exp != 0 && *exp != 0) |
| 1200 | address = parse_and_eval_address (exp); |
| 1201 | else |
| 1202 | return; |
| 1203 | |
| 1204 | xxx.u = find_unwind_entry (address); |
| 1205 | |
| 1206 | if (!xxx.u) |
| 1207 | { |
| 1208 | printf ("Can't find unwind table entry for PC 0x%x\n", address); |
| 1209 | return; |
| 1210 | } |
| 1211 | |
| 1212 | printf ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2], |
| 1213 | xxx.foo[3]); |
| 1214 | } |
| 1215 | |
| 1216 | void |
| 1217 | _initialize_hppa_tdep () |
| 1218 | { |
| 1219 | add_cmd ("unwind", class_maintenance, unwind_command, |
| 1220 | "Print unwind table entry at given address.", |
| 1221 | &maintenanceprintlist); |
| 1222 | } |
| 1223 | |
| 1224 | #endif /* MAINTENANCE_CMDS */ |