| 1 | /* Acorn Risc Machine host machine support. |
| 2 | Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "arm-opcode.h" |
| 24 | |
| 25 | #include <sys/param.h> |
| 26 | #include <sys/dir.h> |
| 27 | #include <signal.h> |
| 28 | #include <sys/ioctl.h> |
| 29 | #include <sys/ptrace.h> |
| 30 | #include <machine/reg.h> |
| 31 | |
| 32 | #define N_TXTADDR(hdr) 0x8000 |
| 33 | #define N_DATADDR(hdr) (hdr.a_text + 0x8000) |
| 34 | |
| 35 | #include "gdbcore.h" |
| 36 | |
| 37 | #include <sys/user.h> /* After a.out.h */ |
| 38 | #include <sys/file.h> |
| 39 | #include "gdb_stat.h" |
| 40 | |
| 41 | #include <errno.h> |
| 42 | |
| 43 | void |
| 44 | fetch_inferior_registers (regno) |
| 45 | int regno; /* Original value discarded */ |
| 46 | { |
| 47 | register unsigned int regaddr; |
| 48 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 49 | register int i; |
| 50 | |
| 51 | struct user u; |
| 52 | unsigned int offset = (char *) &u.u_ar0 - (char *) &u; |
| 53 | offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) |
| 54 | - KERNEL_U_ADDR; |
| 55 | |
| 56 | registers_fetched (); |
| 57 | |
| 58 | for (regno = 0; regno < 16; regno++) |
| 59 | { |
| 60 | regaddr = offset + regno * 4; |
| 61 | *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid, |
| 62 | (PTRACE_ARG3_TYPE) regaddr, 0); |
| 63 | if (regno == PC_REGNUM) |
| 64 | *(int *)&buf[0] = GET_PC_PART(*(int *)&buf[0]); |
| 65 | supply_register (regno, buf); |
| 66 | } |
| 67 | *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid, |
| 68 | (PTRACE_ARG3_TYPE) (offset + PC*4), 0); |
| 69 | supply_register (PS_REGNUM, buf); /* set virtual register ps same as pc */ |
| 70 | |
| 71 | /* read the floating point registers */ |
| 72 | offset = (char *) &u.u_fp_regs - (char *)&u; |
| 73 | *(int *)buf = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0); |
| 74 | supply_register (FPS_REGNUM, buf); |
| 75 | for (regno = 16; regno < 24; regno++) { |
| 76 | regaddr = offset + 4 + 12 * (regno - 16); |
| 77 | for (i = 0; i < 12; i += sizeof(int)) |
| 78 | *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid, |
| 79 | (PTRACE_ARG3_TYPE) (regaddr + i), 0); |
| 80 | supply_register (regno, buf); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /* Store our register values back into the inferior. |
| 85 | If REGNO is -1, do this for all registers. |
| 86 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 87 | |
| 88 | void |
| 89 | store_inferior_registers (regno) |
| 90 | int regno; |
| 91 | { |
| 92 | register unsigned int regaddr; |
| 93 | char buf[80]; |
| 94 | |
| 95 | struct user u; |
| 96 | unsigned long value; |
| 97 | unsigned int offset = (char *) &u.u_ar0 - (char *) &u; |
| 98 | offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) |
| 99 | - KERNEL_U_ADDR; |
| 100 | |
| 101 | if (regno >= 0) { |
| 102 | if (regno >= 16) return; |
| 103 | regaddr = offset + 4 * regno; |
| 104 | errno = 0; |
| 105 | value = read_register(regno); |
| 106 | if (regno == PC_REGNUM) |
| 107 | value = SET_PC_PART(read_register (PS_REGNUM), value); |
| 108 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value); |
| 109 | if (errno != 0) |
| 110 | { |
| 111 | sprintf (buf, "writing register number %d", regno); |
| 112 | perror_with_name (buf); |
| 113 | } |
| 114 | } |
| 115 | else for (regno = 0; regno < 15; regno++) |
| 116 | { |
| 117 | regaddr = offset + regno * 4; |
| 118 | errno = 0; |
| 119 | value = read_register(regno); |
| 120 | if (regno == PC_REGNUM) |
| 121 | value = SET_PC_PART(read_register (PS_REGNUM), value); |
| 122 | ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value); |
| 123 | if (errno != 0) |
| 124 | { |
| 125 | sprintf (buf, "writing all regs, number %d", regno); |
| 126 | perror_with_name (buf); |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | \f |
| 131 | /* Work with core dump and executable files, for GDB. |
| 132 | This code would be in corefile.c if it weren't machine-dependent. */ |
| 133 | |
| 134 | /* Structure to describe the chain of shared libraries used |
| 135 | by the execfile. |
| 136 | e.g. prog shares Xt which shares X11 which shares c. */ |
| 137 | |
| 138 | struct shared_library { |
| 139 | struct exec_header header; |
| 140 | char name[SHLIBLEN]; |
| 141 | CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */ |
| 142 | long data_offset; /* offset of data section in file */ |
| 143 | int chan; /* file descriptor for the file */ |
| 144 | struct shared_library *shares; /* library this one shares */ |
| 145 | }; |
| 146 | static struct shared_library *shlib = 0; |
| 147 | |
| 148 | /* Hook for `exec_file_command' command to call. */ |
| 149 | |
| 150 | extern void (*exec_file_display_hook) (); |
| 151 | |
| 152 | static CORE_ADDR unshared_text_start; |
| 153 | |
| 154 | /* extended header from exec file (for shared library info) */ |
| 155 | |
| 156 | static struct exec_header exec_header; |
| 157 | \f |
| 158 | void |
| 159 | core_file_command (filename, from_tty) |
| 160 | char *filename; |
| 161 | int from_tty; |
| 162 | { |
| 163 | int val; |
| 164 | extern char registers[]; |
| 165 | |
| 166 | /* Discard all vestiges of any previous core file |
| 167 | and mark data and stack spaces as empty. */ |
| 168 | |
| 169 | if (corefile) |
| 170 | free (corefile); |
| 171 | corefile = 0; |
| 172 | |
| 173 | if (corechan >= 0) |
| 174 | close (corechan); |
| 175 | corechan = -1; |
| 176 | |
| 177 | data_start = 0; |
| 178 | data_end = 0; |
| 179 | stack_start = STACK_END_ADDR; |
| 180 | stack_end = STACK_END_ADDR; |
| 181 | |
| 182 | /* Now, if a new core file was specified, open it and digest it. */ |
| 183 | |
| 184 | if (filename) |
| 185 | { |
| 186 | filename = tilde_expand (filename); |
| 187 | make_cleanup (free, filename); |
| 188 | |
| 189 | if (have_inferior_p ()) |
| 190 | error ("To look at a core file, you must kill the program with \"kill\"."); |
| 191 | corechan = open (filename, O_RDONLY, 0); |
| 192 | if (corechan < 0) |
| 193 | perror_with_name (filename); |
| 194 | /* 4.2-style (and perhaps also sysV-style) core dump file. */ |
| 195 | { |
| 196 | struct user u; |
| 197 | |
| 198 | unsigned int reg_offset, fp_reg_offset; |
| 199 | |
| 200 | val = myread (corechan, &u, sizeof u); |
| 201 | if (val < 0) |
| 202 | perror_with_name ("Not a core file: reading upage"); |
| 203 | if (val != sizeof u) |
| 204 | error ("Not a core file: could only read %d bytes", val); |
| 205 | |
| 206 | /* We are depending on exec_file_command having been called |
| 207 | previously to set exec_data_start. Since the executable |
| 208 | and the core file share the same text segment, the address |
| 209 | of the data segment will be the same in both. */ |
| 210 | data_start = exec_data_start; |
| 211 | |
| 212 | data_end = data_start + NBPG * u.u_dsize; |
| 213 | stack_start = stack_end - NBPG * u.u_ssize; |
| 214 | data_offset = NBPG * UPAGES; |
| 215 | stack_offset = NBPG * (UPAGES + u.u_dsize); |
| 216 | |
| 217 | /* Some machines put an absolute address in here and some put |
| 218 | the offset in the upage of the regs. */ |
| 219 | reg_offset = (int) u.u_ar0; |
| 220 | if (reg_offset > NBPG * UPAGES) |
| 221 | reg_offset -= KERNEL_U_ADDR; |
| 222 | fp_reg_offset = (char *) &u.u_fp_regs - (char *)&u; |
| 223 | |
| 224 | /* I don't know where to find this info. |
| 225 | So, for now, mark it as not available. */ |
| 226 | N_SET_MAGIC (core_aouthdr, 0); |
| 227 | |
| 228 | /* Read the register values out of the core file and store |
| 229 | them where `read_register' will find them. */ |
| 230 | |
| 231 | { |
| 232 | register int regno; |
| 233 | |
| 234 | for (regno = 0; regno < NUM_REGS; regno++) |
| 235 | { |
| 236 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 237 | |
| 238 | if (regno < 16) |
| 239 | val = lseek (corechan, reg_offset + 4 * regno, 0); |
| 240 | else if (regno < 24) |
| 241 | val = lseek (corechan, fp_reg_offset + 4 + 12*(regno - 24), 0); |
| 242 | else if (regno == 24) |
| 243 | val = lseek (corechan, fp_reg_offset, 0); |
| 244 | else if (regno == 25) |
| 245 | val = lseek (corechan, reg_offset + 4 * PC, 0); |
| 246 | if (val < 0 |
| 247 | || (val = myread (corechan, buf, sizeof buf)) < 0) |
| 248 | { |
| 249 | char * buffer = (char *) alloca (strlen (reg_names[regno]) |
| 250 | + 30); |
| 251 | strcpy (buffer, "Reading register "); |
| 252 | strcat (buffer, reg_names[regno]); |
| 253 | |
| 254 | perror_with_name (buffer); |
| 255 | } |
| 256 | |
| 257 | if (regno == PC_REGNUM) |
| 258 | *(int *)buf = GET_PC_PART(*(int *)buf); |
| 259 | supply_register (regno, buf); |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | if (filename[0] == '/') |
| 264 | corefile = savestring (filename, strlen (filename)); |
| 265 | else |
| 266 | { |
| 267 | corefile = concat (current_directory, "/", filename, NULL); |
| 268 | } |
| 269 | |
| 270 | flush_cached_frames (); |
| 271 | select_frame (get_current_frame (), 0); |
| 272 | validate_files (); |
| 273 | } |
| 274 | else if (from_tty) |
| 275 | printf ("No core file now.\n"); |
| 276 | } |
| 277 | |
| 278 | #if 0 |
| 279 | /* Work with core dump and executable files, for GDB. |
| 280 | This code would be in corefile.c if it weren't machine-dependent. */ |
| 281 | |
| 282 | /* Structure to describe the chain of shared libraries used |
| 283 | by the execfile. |
| 284 | e.g. prog shares Xt which shares X11 which shares c. */ |
| 285 | |
| 286 | struct shared_library { |
| 287 | struct exec_header header; |
| 288 | char name[SHLIBLEN]; |
| 289 | CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */ |
| 290 | long data_offset; /* offset of data section in file */ |
| 291 | int chan; /* file descriptor for the file */ |
| 292 | struct shared_library *shares; /* library this one shares */ |
| 293 | }; |
| 294 | static struct shared_library *shlib = 0; |
| 295 | |
| 296 | /* Hook for `exec_file_command' command to call. */ |
| 297 | |
| 298 | extern void (*exec_file_display_hook) (); |
| 299 | |
| 300 | static CORE_ADDR unshared_text_start; |
| 301 | |
| 302 | /* extended header from exec file (for shared library info) */ |
| 303 | |
| 304 | static struct exec_header exec_header; |
| 305 | |
| 306 | void |
| 307 | exec_file_command (filename, from_tty) |
| 308 | char *filename; |
| 309 | int from_tty; |
| 310 | { |
| 311 | int val; |
| 312 | |
| 313 | /* Eliminate all traces of old exec file. |
| 314 | Mark text segment as empty. */ |
| 315 | |
| 316 | if (execfile) |
| 317 | free (execfile); |
| 318 | execfile = 0; |
| 319 | data_start = 0; |
| 320 | data_end -= exec_data_start; |
| 321 | text_start = 0; |
| 322 | unshared_text_start = 0; |
| 323 | text_end = 0; |
| 324 | exec_data_start = 0; |
| 325 | exec_data_end = 0; |
| 326 | if (execchan >= 0) |
| 327 | close (execchan); |
| 328 | execchan = -1; |
| 329 | if (shlib) { |
| 330 | close_shared_library(shlib); |
| 331 | shlib = 0; |
| 332 | } |
| 333 | |
| 334 | /* Now open and digest the file the user requested, if any. */ |
| 335 | |
| 336 | if (filename) |
| 337 | { |
| 338 | filename = tilde_expand (filename); |
| 339 | make_cleanup (free, filename); |
| 340 | |
| 341 | execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
| 342 | &execfile); |
| 343 | if (execchan < 0) |
| 344 | perror_with_name (filename); |
| 345 | |
| 346 | { |
| 347 | struct stat st_exec; |
| 348 | |
| 349 | #ifdef HEADER_SEEK_FD |
| 350 | HEADER_SEEK_FD (execchan); |
| 351 | #endif |
| 352 | |
| 353 | val = myread (execchan, &exec_header, sizeof exec_header); |
| 354 | exec_aouthdr = exec_header.a_exec; |
| 355 | |
| 356 | if (val < 0) |
| 357 | perror_with_name (filename); |
| 358 | |
| 359 | text_start = 0x8000; |
| 360 | |
| 361 | /* Look for shared library if needed */ |
| 362 | if (exec_header.a_exec.a_magic & MF_USES_SL) |
| 363 | shlib = open_shared_library(exec_header.a_shlibname, text_start); |
| 364 | |
| 365 | text_offset = N_TXTOFF (exec_aouthdr); |
| 366 | exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text; |
| 367 | |
| 368 | if (shlib) { |
| 369 | unshared_text_start = shared_text_end(shlib) & ~0x7fff; |
| 370 | stack_start = shlib->header.a_exec.a_sldatabase; |
| 371 | stack_end = STACK_END_ADDR; |
| 372 | } else |
| 373 | unshared_text_start = 0x8000; |
| 374 | text_end = unshared_text_start + exec_aouthdr.a_text; |
| 375 | |
| 376 | exec_data_start = unshared_text_start + exec_aouthdr.a_text; |
| 377 | exec_data_end = exec_data_start + exec_aouthdr.a_data; |
| 378 | |
| 379 | data_start = exec_data_start; |
| 380 | data_end += exec_data_start; |
| 381 | |
| 382 | fstat (execchan, &st_exec); |
| 383 | exec_mtime = st_exec.st_mtime; |
| 384 | } |
| 385 | |
| 386 | validate_files (); |
| 387 | } |
| 388 | else if (from_tty) |
| 389 | printf ("No exec file now.\n"); |
| 390 | |
| 391 | /* Tell display code (if any) about the changed file name. */ |
| 392 | if (exec_file_display_hook) |
| 393 | (*exec_file_display_hook) (filename); |
| 394 | } |
| 395 | #endif |
| 396 | |
| 397 | #if 0 |
| 398 | /* Read from the program's memory (except for inferior processes). |
| 399 | This function is misnamed, since it only reads, never writes; and |
| 400 | since it will use the core file and/or executable file as necessary. |
| 401 | |
| 402 | It should be extended to write as well as read, FIXME, for patching files. |
| 403 | |
| 404 | Return 0 if address could be read, EIO if addresss out of bounds. */ |
| 405 | |
| 406 | int |
| 407 | xfer_core_file (memaddr, myaddr, len) |
| 408 | CORE_ADDR memaddr; |
| 409 | char *myaddr; |
| 410 | int len; |
| 411 | { |
| 412 | register int i; |
| 413 | register int val; |
| 414 | int xferchan; |
| 415 | char **xferfile; |
| 416 | int fileptr; |
| 417 | int returnval = 0; |
| 418 | |
| 419 | while (len > 0) |
| 420 | { |
| 421 | xferfile = 0; |
| 422 | xferchan = 0; |
| 423 | |
| 424 | /* Determine which file the next bunch of addresses reside in, |
| 425 | and where in the file. Set the file's read/write pointer |
| 426 | to point at the proper place for the desired address |
| 427 | and set xferfile and xferchan for the correct file. |
| 428 | |
| 429 | If desired address is nonexistent, leave them zero. |
| 430 | |
| 431 | i is set to the number of bytes that can be handled |
| 432 | along with the next address. |
| 433 | |
| 434 | We put the most likely tests first for efficiency. */ |
| 435 | |
| 436 | /* Note that if there is no core file |
| 437 | data_start and data_end are equal. */ |
| 438 | if (memaddr >= data_start && memaddr < data_end) |
| 439 | { |
| 440 | i = min (len, data_end - memaddr); |
| 441 | fileptr = memaddr - data_start + data_offset; |
| 442 | xferfile = &corefile; |
| 443 | xferchan = corechan; |
| 444 | } |
| 445 | /* Note that if there is no core file |
| 446 | stack_start and stack_end define the shared library data. */ |
| 447 | else if (memaddr >= stack_start && memaddr < stack_end) |
| 448 | { |
| 449 | if (corechan < 0) { |
| 450 | struct shared_library *lib; |
| 451 | for (lib = shlib; lib; lib = lib->shares) |
| 452 | if (memaddr >= lib->header.a_exec.a_sldatabase && |
| 453 | memaddr < lib->header.a_exec.a_sldatabase + |
| 454 | lib->header.a_exec.a_data) |
| 455 | break; |
| 456 | if (lib) { |
| 457 | i = min (len, lib->header.a_exec.a_sldatabase + |
| 458 | lib->header.a_exec.a_data - memaddr); |
| 459 | fileptr = lib->data_offset + memaddr - |
| 460 | lib->header.a_exec.a_sldatabase; |
| 461 | xferfile = execfile; |
| 462 | xferchan = lib->chan; |
| 463 | } |
| 464 | } else { |
| 465 | i = min (len, stack_end - memaddr); |
| 466 | fileptr = memaddr - stack_start + stack_offset; |
| 467 | xferfile = &corefile; |
| 468 | xferchan = corechan; |
| 469 | } |
| 470 | } |
| 471 | else if (corechan < 0 |
| 472 | && memaddr >= exec_data_start && memaddr < exec_data_end) |
| 473 | { |
| 474 | i = min (len, exec_data_end - memaddr); |
| 475 | fileptr = memaddr - exec_data_start + exec_data_offset; |
| 476 | xferfile = &execfile; |
| 477 | xferchan = execchan; |
| 478 | } |
| 479 | else if (memaddr >= text_start && memaddr < text_end) |
| 480 | { |
| 481 | struct shared_library *lib; |
| 482 | for (lib = shlib; lib; lib = lib->shares) |
| 483 | if (memaddr >= lib->text_start && |
| 484 | memaddr < lib->text_start + lib->header.a_exec.a_text) |
| 485 | break; |
| 486 | if (lib) { |
| 487 | i = min (len, lib->header.a_exec.a_text + |
| 488 | lib->text_start - memaddr); |
| 489 | fileptr = memaddr - lib->text_start + text_offset; |
| 490 | xferfile = &execfile; |
| 491 | xferchan = lib->chan; |
| 492 | } else { |
| 493 | i = min (len, text_end - memaddr); |
| 494 | fileptr = memaddr - unshared_text_start + text_offset; |
| 495 | xferfile = &execfile; |
| 496 | xferchan = execchan; |
| 497 | } |
| 498 | } |
| 499 | else if (memaddr < text_start) |
| 500 | { |
| 501 | i = min (len, text_start - memaddr); |
| 502 | } |
| 503 | else if (memaddr >= text_end |
| 504 | && memaddr < (corechan >= 0? data_start : exec_data_start)) |
| 505 | { |
| 506 | i = min (len, data_start - memaddr); |
| 507 | } |
| 508 | else if (corechan >= 0 |
| 509 | && memaddr >= data_end && memaddr < stack_start) |
| 510 | { |
| 511 | i = min (len, stack_start - memaddr); |
| 512 | } |
| 513 | else if (corechan < 0 && memaddr >= exec_data_end) |
| 514 | { |
| 515 | i = min (len, - memaddr); |
| 516 | } |
| 517 | else if (memaddr >= stack_end && stack_end != 0) |
| 518 | { |
| 519 | i = min (len, - memaddr); |
| 520 | } |
| 521 | else |
| 522 | { |
| 523 | /* Address did not classify into one of the known ranges. |
| 524 | This shouldn't happen; we catch the endpoints. */ |
| 525 | fatal ("Internal: Bad case logic in xfer_core_file."); |
| 526 | } |
| 527 | |
| 528 | /* Now we know which file to use. |
| 529 | Set up its pointer and transfer the data. */ |
| 530 | if (xferfile) |
| 531 | { |
| 532 | if (*xferfile == 0) |
| 533 | if (xferfile == &execfile) |
| 534 | error ("No program file to examine."); |
| 535 | else |
| 536 | error ("No core dump file or running program to examine."); |
| 537 | val = lseek (xferchan, fileptr, 0); |
| 538 | if (val < 0) |
| 539 | perror_with_name (*xferfile); |
| 540 | val = myread (xferchan, myaddr, i); |
| 541 | if (val < 0) |
| 542 | perror_with_name (*xferfile); |
| 543 | } |
| 544 | /* If this address is for nonexistent memory, |
| 545 | read zeros if reading, or do nothing if writing. |
| 546 | Actually, we never right. */ |
| 547 | else |
| 548 | { |
| 549 | memset (myaddr, '\0', i); |
| 550 | returnval = EIO; |
| 551 | } |
| 552 | |
| 553 | memaddr += i; |
| 554 | myaddr += i; |
| 555 | len -= i; |
| 556 | } |
| 557 | return returnval; |
| 558 | } |
| 559 | #endif |