| 1 | /* SPU native-dependent code for GDB, the GNU debugger. |
| 2 | Copyright (C) 2006-2015 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Ulrich Weigand <uweigand@de.ibm.com>. |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "target.h" |
| 24 | #include "inferior.h" |
| 25 | #include "inf-child.h" |
| 26 | #include "inf-ptrace.h" |
| 27 | #include "regcache.h" |
| 28 | #include "symfile.h" |
| 29 | #include "gdb_wait.h" |
| 30 | #include "gdbthread.h" |
| 31 | #include "gdb_bfd.h" |
| 32 | |
| 33 | #include "nat/gdb_ptrace.h" |
| 34 | #include <asm/ptrace.h> |
| 35 | #include <sys/types.h> |
| 36 | |
| 37 | #include "spu-tdep.h" |
| 38 | |
| 39 | /* PPU side system calls. */ |
| 40 | #define INSTR_SC 0x44000002 |
| 41 | #define NR_spu_run 0x0116 |
| 42 | |
| 43 | |
| 44 | /* Fetch PPU register REGNO. */ |
| 45 | static ULONGEST |
| 46 | fetch_ppc_register (int regno) |
| 47 | { |
| 48 | PTRACE_TYPE_RET res; |
| 49 | |
| 50 | int tid = ptid_get_lwp (inferior_ptid); |
| 51 | if (tid == 0) |
| 52 | tid = ptid_get_pid (inferior_ptid); |
| 53 | |
| 54 | #ifndef __powerpc64__ |
| 55 | /* If running as a 32-bit process on a 64-bit system, we attempt |
| 56 | to get the full 64-bit register content of the target process. |
| 57 | If the PPC special ptrace call fails, we're on a 32-bit system; |
| 58 | just fall through to the regular ptrace call in that case. */ |
| 59 | { |
| 60 | gdb_byte buf[8]; |
| 61 | |
| 62 | errno = 0; |
| 63 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, |
| 64 | (PTRACE_TYPE_ARG3) (regno * 8), buf); |
| 65 | if (errno == 0) |
| 66 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, |
| 67 | (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4); |
| 68 | if (errno == 0) |
| 69 | return (ULONGEST) *(uint64_t *)buf; |
| 70 | } |
| 71 | #endif |
| 72 | |
| 73 | errno = 0; |
| 74 | res = ptrace (PT_READ_U, tid, |
| 75 | (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0); |
| 76 | if (errno != 0) |
| 77 | { |
| 78 | char mess[128]; |
| 79 | xsnprintf (mess, sizeof mess, "reading PPC register #%d", regno); |
| 80 | perror_with_name (_(mess)); |
| 81 | } |
| 82 | |
| 83 | return (ULONGEST) (unsigned long) res; |
| 84 | } |
| 85 | |
| 86 | /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */ |
| 87 | static int |
| 88 | fetch_ppc_memory_1 (int tid, ULONGEST memaddr, PTRACE_TYPE_RET *word) |
| 89 | { |
| 90 | errno = 0; |
| 91 | |
| 92 | #ifndef __powerpc64__ |
| 93 | if (memaddr >> 32) |
| 94 | { |
| 95 | uint64_t addr_8 = (uint64_t) memaddr; |
| 96 | ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); |
| 97 | } |
| 98 | else |
| 99 | #endif |
| 100 | *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0); |
| 101 | |
| 102 | return errno; |
| 103 | } |
| 104 | |
| 105 | /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */ |
| 106 | static int |
| 107 | store_ppc_memory_1 (int tid, ULONGEST memaddr, PTRACE_TYPE_RET word) |
| 108 | { |
| 109 | errno = 0; |
| 110 | |
| 111 | #ifndef __powerpc64__ |
| 112 | if (memaddr >> 32) |
| 113 | { |
| 114 | uint64_t addr_8 = (uint64_t) memaddr; |
| 115 | ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); |
| 116 | } |
| 117 | else |
| 118 | #endif |
| 119 | ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word); |
| 120 | |
| 121 | return errno; |
| 122 | } |
| 123 | |
| 124 | /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */ |
| 125 | static int |
| 126 | fetch_ppc_memory (ULONGEST memaddr, gdb_byte *myaddr, int len) |
| 127 | { |
| 128 | int i, ret; |
| 129 | |
| 130 | ULONGEST addr = memaddr & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
| 131 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
| 132 | / sizeof (PTRACE_TYPE_RET)); |
| 133 | PTRACE_TYPE_RET *buffer; |
| 134 | |
| 135 | int tid = ptid_get_lwp (inferior_ptid); |
| 136 | if (tid == 0) |
| 137 | tid = ptid_get_pid (inferior_ptid); |
| 138 | |
| 139 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); |
| 140 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 141 | { |
| 142 | ret = fetch_ppc_memory_1 (tid, addr, &buffer[i]); |
| 143 | if (ret) |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | memcpy (myaddr, |
| 148 | (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 149 | len); |
| 150 | |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */ |
| 155 | static int |
| 156 | store_ppc_memory (ULONGEST memaddr, const gdb_byte *myaddr, int len) |
| 157 | { |
| 158 | int i, ret; |
| 159 | |
| 160 | ULONGEST addr = memaddr & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
| 161 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
| 162 | / sizeof (PTRACE_TYPE_RET)); |
| 163 | PTRACE_TYPE_RET *buffer; |
| 164 | |
| 165 | int tid = ptid_get_lwp (inferior_ptid); |
| 166 | if (tid == 0) |
| 167 | tid = ptid_get_pid (inferior_ptid); |
| 168 | |
| 169 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); |
| 170 | |
| 171 | if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET)) |
| 172 | { |
| 173 | ret = fetch_ppc_memory_1 (tid, addr, &buffer[0]); |
| 174 | if (ret) |
| 175 | return ret; |
| 176 | } |
| 177 | |
| 178 | if (count > 1) |
| 179 | { |
| 180 | ret = fetch_ppc_memory_1 (tid, addr + (count - 1) |
| 181 | * sizeof (PTRACE_TYPE_RET), |
| 182 | &buffer[count - 1]); |
| 183 | if (ret) |
| 184 | return ret; |
| 185 | } |
| 186 | |
| 187 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 188 | myaddr, len); |
| 189 | |
| 190 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 191 | { |
| 192 | ret = store_ppc_memory_1 (tid, addr, buffer[i]); |
| 193 | if (ret) |
| 194 | return ret; |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | |
| 201 | /* If the PPU thread is currently stopped on a spu_run system call, |
| 202 | return to FD and ADDR the file handle and NPC parameter address |
| 203 | used with the system call. Return non-zero if successful. */ |
| 204 | static int |
| 205 | parse_spufs_run (int *fd, ULONGEST *addr) |
| 206 | { |
| 207 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 208 | gdb_byte buf[4]; |
| 209 | ULONGEST pc = fetch_ppc_register (32); /* nip */ |
| 210 | |
| 211 | /* Fetch instruction preceding current NIP. */ |
| 212 | if (fetch_ppc_memory (pc-4, buf, 4) != 0) |
| 213 | return 0; |
| 214 | /* It should be a "sc" instruction. */ |
| 215 | if (extract_unsigned_integer (buf, 4, byte_order) != INSTR_SC) |
| 216 | return 0; |
| 217 | /* System call number should be NR_spu_run. */ |
| 218 | if (fetch_ppc_register (0) != NR_spu_run) |
| 219 | return 0; |
| 220 | |
| 221 | /* Register 3 contains fd, register 4 the NPC param pointer. */ |
| 222 | *fd = fetch_ppc_register (34); /* orig_gpr3 */ |
| 223 | *addr = fetch_ppc_register (4); |
| 224 | return 1; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | /* Implement the to_xfer_partial target_ops method for TARGET_OBJECT_SPU. |
| 229 | Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF, |
| 230 | using the /proc file system. */ |
| 231 | |
| 232 | static enum target_xfer_status |
| 233 | spu_proc_xfer_spu (const char *annex, gdb_byte *readbuf, |
| 234 | const gdb_byte *writebuf, |
| 235 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
| 236 | { |
| 237 | char buf[128]; |
| 238 | int fd = 0; |
| 239 | int ret = -1; |
| 240 | int pid = ptid_get_pid (inferior_ptid); |
| 241 | |
| 242 | if (!annex) |
| 243 | return TARGET_XFER_EOF; |
| 244 | |
| 245 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); |
| 246 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); |
| 247 | if (fd <= 0) |
| 248 | return TARGET_XFER_E_IO; |
| 249 | |
| 250 | if (offset != 0 |
| 251 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) |
| 252 | { |
| 253 | close (fd); |
| 254 | return TARGET_XFER_EOF; |
| 255 | } |
| 256 | |
| 257 | if (writebuf) |
| 258 | ret = write (fd, writebuf, (size_t) len); |
| 259 | else if (readbuf) |
| 260 | ret = read (fd, readbuf, (size_t) len); |
| 261 | |
| 262 | close (fd); |
| 263 | if (ret < 0) |
| 264 | return TARGET_XFER_E_IO; |
| 265 | else if (ret == 0) |
| 266 | return TARGET_XFER_EOF; |
| 267 | else |
| 268 | { |
| 269 | *xfered_len = (ULONGEST) ret; |
| 270 | return TARGET_XFER_OK; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | |
| 275 | /* Inferior memory should contain an SPE executable image at location ADDR. |
| 276 | Allocate a BFD representing that executable. Return NULL on error. */ |
| 277 | |
| 278 | static void * |
| 279 | spu_bfd_iovec_open (struct bfd *nbfd, void *open_closure) |
| 280 | { |
| 281 | return open_closure; |
| 282 | } |
| 283 | |
| 284 | static int |
| 285 | spu_bfd_iovec_close (struct bfd *nbfd, void *stream) |
| 286 | { |
| 287 | xfree (stream); |
| 288 | |
| 289 | /* Zero means success. */ |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static file_ptr |
| 294 | spu_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf, |
| 295 | file_ptr nbytes, file_ptr offset) |
| 296 | { |
| 297 | ULONGEST addr = *(ULONGEST *)stream; |
| 298 | |
| 299 | if (fetch_ppc_memory (addr + offset, buf, nbytes) != 0) |
| 300 | { |
| 301 | bfd_set_error (bfd_error_invalid_operation); |
| 302 | return -1; |
| 303 | } |
| 304 | |
| 305 | return nbytes; |
| 306 | } |
| 307 | |
| 308 | static int |
| 309 | spu_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb) |
| 310 | { |
| 311 | /* We don't have an easy way of finding the size of embedded spu |
| 312 | images. We could parse the in-memory ELF header and section |
| 313 | table to find the extent of the last section but that seems |
| 314 | pointless when the size is needed only for checks of other |
| 315 | parsed values in dbxread.c. */ |
| 316 | memset (sb, 0, sizeof (struct stat)); |
| 317 | sb->st_size = INT_MAX; |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | static bfd * |
| 322 | spu_bfd_open (ULONGEST addr) |
| 323 | { |
| 324 | struct bfd *nbfd; |
| 325 | asection *spu_name; |
| 326 | |
| 327 | ULONGEST *open_closure = XNEW (ULONGEST); |
| 328 | *open_closure = addr; |
| 329 | |
| 330 | nbfd = gdb_bfd_openr_iovec ("<in-memory>", "elf32-spu", |
| 331 | spu_bfd_iovec_open, open_closure, |
| 332 | spu_bfd_iovec_pread, spu_bfd_iovec_close, |
| 333 | spu_bfd_iovec_stat); |
| 334 | if (!nbfd) |
| 335 | return NULL; |
| 336 | |
| 337 | if (!bfd_check_format (nbfd, bfd_object)) |
| 338 | { |
| 339 | gdb_bfd_unref (nbfd); |
| 340 | return NULL; |
| 341 | } |
| 342 | |
| 343 | /* Retrieve SPU name note and update BFD name. */ |
| 344 | spu_name = bfd_get_section_by_name (nbfd, ".note.spu_name"); |
| 345 | if (spu_name) |
| 346 | { |
| 347 | int sect_size = bfd_section_size (nbfd, spu_name); |
| 348 | if (sect_size > 20) |
| 349 | { |
| 350 | char *buf = alloca (sect_size - 20 + 1); |
| 351 | bfd_get_section_contents (nbfd, spu_name, buf, 20, sect_size - 20); |
| 352 | buf[sect_size - 20] = '\0'; |
| 353 | |
| 354 | xfree ((char *)nbfd->filename); |
| 355 | nbfd->filename = xstrdup (buf); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | return nbfd; |
| 360 | } |
| 361 | |
| 362 | /* INFERIOR_FD is a file handle passed by the inferior to the |
| 363 | spu_run system call. Assuming the SPE context was allocated |
| 364 | by the libspe library, try to retrieve the main SPE executable |
| 365 | file from its copy within the target process. */ |
| 366 | static void |
| 367 | spu_symbol_file_add_from_memory (int inferior_fd) |
| 368 | { |
| 369 | ULONGEST addr; |
| 370 | struct bfd *nbfd; |
| 371 | |
| 372 | gdb_byte id[128]; |
| 373 | char annex[32]; |
| 374 | ULONGEST len; |
| 375 | enum target_xfer_status status; |
| 376 | |
| 377 | /* Read object ID. */ |
| 378 | xsnprintf (annex, sizeof annex, "%d/object-id", inferior_fd); |
| 379 | status = spu_proc_xfer_spu (annex, id, NULL, 0, sizeof id, &len); |
| 380 | if (status != TARGET_XFER_OK || len >= sizeof id) |
| 381 | return; |
| 382 | id[len] = 0; |
| 383 | addr = strtoulst ((const char *) id, NULL, 16); |
| 384 | if (!addr) |
| 385 | return; |
| 386 | |
| 387 | /* Open BFD representing SPE executable and read its symbols. */ |
| 388 | nbfd = spu_bfd_open (addr); |
| 389 | if (nbfd) |
| 390 | { |
| 391 | struct cleanup *cleanup = make_cleanup_bfd_unref (nbfd); |
| 392 | |
| 393 | symbol_file_add_from_bfd (nbfd, bfd_get_filename (nbfd), |
| 394 | SYMFILE_VERBOSE | SYMFILE_MAINLINE, |
| 395 | NULL, 0, NULL); |
| 396 | do_cleanups (cleanup); |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | |
| 401 | /* Override the post_startup_inferior routine to continue running |
| 402 | the inferior until the first spu_run system call. */ |
| 403 | static void |
| 404 | spu_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) |
| 405 | { |
| 406 | int fd; |
| 407 | ULONGEST addr; |
| 408 | |
| 409 | int tid = ptid_get_lwp (ptid); |
| 410 | if (tid == 0) |
| 411 | tid = ptid_get_pid (ptid); |
| 412 | |
| 413 | while (!parse_spufs_run (&fd, &addr)) |
| 414 | { |
| 415 | ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0); |
| 416 | waitpid (tid, NULL, __WALL | __WNOTHREAD); |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | /* Override the post_attach routine to try load the SPE executable |
| 421 | file image from its copy inside the target process. */ |
| 422 | static void |
| 423 | spu_child_post_attach (struct target_ops *self, int pid) |
| 424 | { |
| 425 | int fd; |
| 426 | ULONGEST addr; |
| 427 | |
| 428 | /* Like child_post_startup_inferior, if we happened to attach to |
| 429 | the inferior while it wasn't currently in spu_run, continue |
| 430 | running it until we get back there. */ |
| 431 | while (!parse_spufs_run (&fd, &addr)) |
| 432 | { |
| 433 | ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0); |
| 434 | waitpid (pid, NULL, __WALL | __WNOTHREAD); |
| 435 | } |
| 436 | |
| 437 | /* If the user has not provided an executable file, try to extract |
| 438 | the image from inside the target process. */ |
| 439 | if (!get_exec_file (0)) |
| 440 | spu_symbol_file_add_from_memory (fd); |
| 441 | } |
| 442 | |
| 443 | /* Wait for child PTID to do something. Return id of the child, |
| 444 | minus_one_ptid in case of error; store status into *OURSTATUS. */ |
| 445 | static ptid_t |
| 446 | spu_child_wait (struct target_ops *ops, |
| 447 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
| 448 | { |
| 449 | int save_errno; |
| 450 | int status; |
| 451 | pid_t pid; |
| 452 | |
| 453 | do |
| 454 | { |
| 455 | set_sigint_trap (); /* Causes SIGINT to be passed on to the |
| 456 | attached process. */ |
| 457 | |
| 458 | pid = waitpid (ptid_get_pid (ptid), &status, 0); |
| 459 | if (pid == -1 && errno == ECHILD) |
| 460 | /* Try again with __WCLONE to check cloned processes. */ |
| 461 | pid = waitpid (ptid_get_pid (ptid), &status, __WCLONE); |
| 462 | |
| 463 | save_errno = errno; |
| 464 | |
| 465 | /* Make sure we don't report an event for the exit of the |
| 466 | original program, if we've detached from it. */ |
| 467 | if (pid != -1 && !WIFSTOPPED (status) |
| 468 | && pid != ptid_get_pid (inferior_ptid)) |
| 469 | { |
| 470 | pid = -1; |
| 471 | save_errno = EINTR; |
| 472 | } |
| 473 | |
| 474 | clear_sigint_trap (); |
| 475 | } |
| 476 | while (pid == -1 && save_errno == EINTR); |
| 477 | |
| 478 | if (pid == -1) |
| 479 | { |
| 480 | warning (_("Child process unexpectedly missing: %s"), |
| 481 | safe_strerror (save_errno)); |
| 482 | |
| 483 | /* Claim it exited with unknown signal. */ |
| 484 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 485 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
| 486 | return inferior_ptid; |
| 487 | } |
| 488 | |
| 489 | store_waitstatus (ourstatus, status); |
| 490 | return pid_to_ptid (pid); |
| 491 | } |
| 492 | |
| 493 | /* Override the fetch_inferior_register routine. */ |
| 494 | static void |
| 495 | spu_fetch_inferior_registers (struct target_ops *ops, |
| 496 | struct regcache *regcache, int regno) |
| 497 | { |
| 498 | int fd; |
| 499 | ULONGEST addr; |
| 500 | |
| 501 | /* We must be stopped on a spu_run system call. */ |
| 502 | if (!parse_spufs_run (&fd, &addr)) |
| 503 | return; |
| 504 | |
| 505 | /* The ID register holds the spufs file handle. */ |
| 506 | if (regno == -1 || regno == SPU_ID_REGNUM) |
| 507 | { |
| 508 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 509 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 510 | gdb_byte buf[4]; |
| 511 | store_unsigned_integer (buf, 4, byte_order, fd); |
| 512 | regcache_raw_supply (regcache, SPU_ID_REGNUM, buf); |
| 513 | } |
| 514 | |
| 515 | /* The NPC register is found at ADDR. */ |
| 516 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 517 | { |
| 518 | gdb_byte buf[4]; |
| 519 | if (fetch_ppc_memory (addr, buf, 4) == 0) |
| 520 | regcache_raw_supply (regcache, SPU_PC_REGNUM, buf); |
| 521 | } |
| 522 | |
| 523 | /* The GPRs are found in the "regs" spufs file. */ |
| 524 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) |
| 525 | { |
| 526 | gdb_byte buf[16 * SPU_NUM_GPRS]; |
| 527 | char annex[32]; |
| 528 | int i; |
| 529 | ULONGEST len; |
| 530 | |
| 531 | xsnprintf (annex, sizeof annex, "%d/regs", fd); |
| 532 | if ((spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf, &len) |
| 533 | == TARGET_XFER_OK) |
| 534 | && len == sizeof buf) |
| 535 | for (i = 0; i < SPU_NUM_GPRS; i++) |
| 536 | regcache_raw_supply (regcache, i, buf + i*16); |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | /* Override the store_inferior_register routine. */ |
| 541 | static void |
| 542 | spu_store_inferior_registers (struct target_ops *ops, |
| 543 | struct regcache *regcache, int regno) |
| 544 | { |
| 545 | int fd; |
| 546 | ULONGEST addr; |
| 547 | |
| 548 | /* We must be stopped on a spu_run system call. */ |
| 549 | if (!parse_spufs_run (&fd, &addr)) |
| 550 | return; |
| 551 | |
| 552 | /* The NPC register is found at ADDR. */ |
| 553 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 554 | { |
| 555 | gdb_byte buf[4]; |
| 556 | regcache_raw_collect (regcache, SPU_PC_REGNUM, buf); |
| 557 | store_ppc_memory (addr, buf, 4); |
| 558 | } |
| 559 | |
| 560 | /* The GPRs are found in the "regs" spufs file. */ |
| 561 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) |
| 562 | { |
| 563 | gdb_byte buf[16 * SPU_NUM_GPRS]; |
| 564 | char annex[32]; |
| 565 | int i; |
| 566 | ULONGEST len; |
| 567 | |
| 568 | for (i = 0; i < SPU_NUM_GPRS; i++) |
| 569 | regcache_raw_collect (regcache, i, buf + i*16); |
| 570 | |
| 571 | xsnprintf (annex, sizeof annex, "%d/regs", fd); |
| 572 | spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf, &len); |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | /* Override the to_xfer_partial routine. */ |
| 577 | static enum target_xfer_status |
| 578 | spu_xfer_partial (struct target_ops *ops, |
| 579 | enum target_object object, const char *annex, |
| 580 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 581 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
| 582 | { |
| 583 | if (object == TARGET_OBJECT_SPU) |
| 584 | return spu_proc_xfer_spu (annex, readbuf, writebuf, offset, len, |
| 585 | xfered_len); |
| 586 | |
| 587 | if (object == TARGET_OBJECT_MEMORY) |
| 588 | { |
| 589 | int fd; |
| 590 | ULONGEST addr; |
| 591 | char mem_annex[32], lslr_annex[32]; |
| 592 | gdb_byte buf[32]; |
| 593 | ULONGEST lslr; |
| 594 | enum target_xfer_status ret; |
| 595 | |
| 596 | /* We must be stopped on a spu_run system call. */ |
| 597 | if (!parse_spufs_run (&fd, &addr)) |
| 598 | return TARGET_XFER_EOF; |
| 599 | |
| 600 | /* Use the "mem" spufs file to access SPU local store. */ |
| 601 | xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd); |
| 602 | ret = spu_proc_xfer_spu (mem_annex, readbuf, writebuf, offset, len, |
| 603 | xfered_len); |
| 604 | if (ret == TARGET_XFER_OK) |
| 605 | return ret; |
| 606 | |
| 607 | /* SPU local store access wraps the address around at the |
| 608 | local store limit. We emulate this here. To avoid needing |
| 609 | an extra access to retrieve the LSLR, we only do that after |
| 610 | trying the original address first, and getting end-of-file. */ |
| 611 | xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd); |
| 612 | memset (buf, 0, sizeof buf); |
| 613 | if (spu_proc_xfer_spu (lslr_annex, buf, NULL, 0, sizeof buf, xfered_len) |
| 614 | != TARGET_XFER_OK) |
| 615 | return ret; |
| 616 | |
| 617 | lslr = strtoulst ((const char *) buf, NULL, 16); |
| 618 | return spu_proc_xfer_spu (mem_annex, readbuf, writebuf, |
| 619 | offset & lslr, len, xfered_len); |
| 620 | } |
| 621 | |
| 622 | return TARGET_XFER_E_IO; |
| 623 | } |
| 624 | |
| 625 | /* Override the to_can_use_hw_breakpoint routine. */ |
| 626 | static int |
| 627 | spu_can_use_hw_breakpoint (struct target_ops *self, |
| 628 | enum bptype type, int cnt, int othertype) |
| 629 | { |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | /* -Wmissing-prototypes */ |
| 634 | extern initialize_file_ftype _initialize_spu_nat; |
| 635 | |
| 636 | /* Initialize SPU native target. */ |
| 637 | void |
| 638 | _initialize_spu_nat (void) |
| 639 | { |
| 640 | /* Generic ptrace methods. */ |
| 641 | struct target_ops *t; |
| 642 | t = inf_ptrace_target (); |
| 643 | |
| 644 | /* Add SPU methods. */ |
| 645 | t->to_post_attach = spu_child_post_attach; |
| 646 | t->to_post_startup_inferior = spu_child_post_startup_inferior; |
| 647 | t->to_wait = spu_child_wait; |
| 648 | t->to_fetch_registers = spu_fetch_inferior_registers; |
| 649 | t->to_store_registers = spu_store_inferior_registers; |
| 650 | t->to_xfer_partial = spu_xfer_partial; |
| 651 | t->to_can_use_hw_breakpoint = spu_can_use_hw_breakpoint; |
| 652 | |
| 653 | /* Register SPU target. */ |
| 654 | add_target (t); |
| 655 | } |