| 1 | /* SPU native-dependent code for GDB, the GNU debugger. |
| 2 | Copyright (C) 2006-2019 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 "gdbsupport/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 | class spu_linux_nat_target final : public inf_ptrace_target |
| 44 | { |
| 45 | public: |
| 46 | void fetch_registers (struct regcache *regcache, int regnum) override; |
| 47 | void store_registers (struct regcache *regcache, int regnum) override; |
| 48 | |
| 49 | void post_attach (int) override; |
| 50 | void post_startup_inferior (ptid_t) override; |
| 51 | |
| 52 | ptid_t wait (ptid_t, struct target_waitstatus *, int options) override; |
| 53 | |
| 54 | enum target_xfer_status xfer_partial (enum target_object object, |
| 55 | const char *annex, |
| 56 | gdb_byte *readbuf, |
| 57 | const gdb_byte *writebuf, |
| 58 | ULONGEST offset, ULONGEST len, |
| 59 | ULONGEST *xfered_len) override; |
| 60 | |
| 61 | int can_use_hw_breakpoint (enum bptype, int, int) override; |
| 62 | }; |
| 63 | |
| 64 | static spu_linux_nat_target the_spu_linux_nat_target; |
| 65 | |
| 66 | /* Fetch PPU register REGNO. */ |
| 67 | static ULONGEST |
| 68 | fetch_ppc_register (int regno) |
| 69 | { |
| 70 | PTRACE_TYPE_RET res; |
| 71 | |
| 72 | int tid = inferior_ptid.lwp (); |
| 73 | if (tid == 0) |
| 74 | tid = inferior_ptid.pid (); |
| 75 | |
| 76 | #ifndef __powerpc64__ |
| 77 | /* If running as a 32-bit process on a 64-bit system, we attempt |
| 78 | to get the full 64-bit register content of the target process. |
| 79 | If the PPC special ptrace call fails, we're on a 32-bit system; |
| 80 | just fall through to the regular ptrace call in that case. */ |
| 81 | { |
| 82 | gdb_byte buf[8]; |
| 83 | |
| 84 | errno = 0; |
| 85 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, |
| 86 | (PTRACE_TYPE_ARG3) (regno * 8), buf); |
| 87 | if (errno == 0) |
| 88 | ptrace (PPC_PTRACE_PEEKUSR_3264, tid, |
| 89 | (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4); |
| 90 | if (errno == 0) |
| 91 | return (ULONGEST) *(uint64_t *)buf; |
| 92 | } |
| 93 | #endif |
| 94 | |
| 95 | errno = 0; |
| 96 | res = ptrace (PT_READ_U, tid, |
| 97 | (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0); |
| 98 | if (errno != 0) |
| 99 | { |
| 100 | char mess[128]; |
| 101 | xsnprintf (mess, sizeof mess, "reading PPC register #%d", regno); |
| 102 | perror_with_name (_(mess)); |
| 103 | } |
| 104 | |
| 105 | return (ULONGEST) (unsigned long) res; |
| 106 | } |
| 107 | |
| 108 | /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */ |
| 109 | static int |
| 110 | fetch_ppc_memory_1 (int tid, ULONGEST memaddr, PTRACE_TYPE_RET *word) |
| 111 | { |
| 112 | errno = 0; |
| 113 | |
| 114 | #ifndef __powerpc64__ |
| 115 | if (memaddr >> 32) |
| 116 | { |
| 117 | uint64_t addr_8 = (uint64_t) memaddr; |
| 118 | ptrace (PPC_PTRACE_PEEKTEXT_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); |
| 119 | } |
| 120 | else |
| 121 | #endif |
| 122 | *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0); |
| 123 | |
| 124 | return errno; |
| 125 | } |
| 126 | |
| 127 | /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */ |
| 128 | static int |
| 129 | store_ppc_memory_1 (int tid, ULONGEST memaddr, PTRACE_TYPE_RET word) |
| 130 | { |
| 131 | errno = 0; |
| 132 | |
| 133 | #ifndef __powerpc64__ |
| 134 | if (memaddr >> 32) |
| 135 | { |
| 136 | uint64_t addr_8 = (uint64_t) memaddr; |
| 137 | ptrace (PPC_PTRACE_POKEDATA_3264, tid, (PTRACE_TYPE_ARG3) &addr_8, word); |
| 138 | } |
| 139 | else |
| 140 | #endif |
| 141 | ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word); |
| 142 | |
| 143 | return errno; |
| 144 | } |
| 145 | |
| 146 | /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */ |
| 147 | static int |
| 148 | fetch_ppc_memory (ULONGEST memaddr, gdb_byte *myaddr, int len) |
| 149 | { |
| 150 | int i, ret; |
| 151 | |
| 152 | ULONGEST addr = memaddr & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
| 153 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
| 154 | / sizeof (PTRACE_TYPE_RET)); |
| 155 | PTRACE_TYPE_RET *buffer; |
| 156 | |
| 157 | int tid = inferior_ptid.lwp (); |
| 158 | if (tid == 0) |
| 159 | tid = inferior_ptid.pid (); |
| 160 | |
| 161 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); |
| 162 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 163 | { |
| 164 | ret = fetch_ppc_memory_1 (tid, addr, &buffer[i]); |
| 165 | if (ret) |
| 166 | return ret; |
| 167 | } |
| 168 | |
| 169 | memcpy (myaddr, |
| 170 | (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 171 | len); |
| 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */ |
| 177 | static int |
| 178 | store_ppc_memory (ULONGEST memaddr, const gdb_byte *myaddr, int len) |
| 179 | { |
| 180 | int i, ret; |
| 181 | |
| 182 | ULONGEST addr = memaddr & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
| 183 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
| 184 | / sizeof (PTRACE_TYPE_RET)); |
| 185 | PTRACE_TYPE_RET *buffer; |
| 186 | |
| 187 | int tid = inferior_ptid.lwp (); |
| 188 | if (tid == 0) |
| 189 | tid = inferior_ptid.pid (); |
| 190 | |
| 191 | buffer = (PTRACE_TYPE_RET *) alloca (count * sizeof (PTRACE_TYPE_RET)); |
| 192 | |
| 193 | if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET)) |
| 194 | { |
| 195 | ret = fetch_ppc_memory_1 (tid, addr, &buffer[0]); |
| 196 | if (ret) |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | if (count > 1) |
| 201 | { |
| 202 | ret = fetch_ppc_memory_1 (tid, addr + (count - 1) |
| 203 | * sizeof (PTRACE_TYPE_RET), |
| 204 | &buffer[count - 1]); |
| 205 | if (ret) |
| 206 | return ret; |
| 207 | } |
| 208 | |
| 209 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 210 | myaddr, len); |
| 211 | |
| 212 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 213 | { |
| 214 | ret = store_ppc_memory_1 (tid, addr, buffer[i]); |
| 215 | if (ret) |
| 216 | return ret; |
| 217 | } |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | |
| 223 | /* If the PPU thread is currently stopped on a spu_run system call, |
| 224 | return to FD and ADDR the file handle and NPC parameter address |
| 225 | used with the system call. Return non-zero if successful. */ |
| 226 | static int |
| 227 | parse_spufs_run (int *fd, ULONGEST *addr) |
| 228 | { |
| 229 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 230 | gdb_byte buf[4]; |
| 231 | ULONGEST pc = fetch_ppc_register (32); /* nip */ |
| 232 | |
| 233 | /* Fetch instruction preceding current NIP. */ |
| 234 | if (fetch_ppc_memory (pc-4, buf, 4) != 0) |
| 235 | return 0; |
| 236 | /* It should be a "sc" instruction. */ |
| 237 | if (extract_unsigned_integer (buf, 4, byte_order) != INSTR_SC) |
| 238 | return 0; |
| 239 | /* System call number should be NR_spu_run. */ |
| 240 | if (fetch_ppc_register (0) != NR_spu_run) |
| 241 | return 0; |
| 242 | |
| 243 | /* Register 3 contains fd, register 4 the NPC param pointer. */ |
| 244 | *fd = fetch_ppc_register (34); /* orig_gpr3 */ |
| 245 | *addr = fetch_ppc_register (4); |
| 246 | return 1; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | /* Implement the to_xfer_partial target_ops method for TARGET_OBJECT_SPU. |
| 251 | Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF, |
| 252 | using the /proc file system. */ |
| 253 | |
| 254 | static enum target_xfer_status |
| 255 | spu_proc_xfer_spu (const char *annex, gdb_byte *readbuf, |
| 256 | const gdb_byte *writebuf, |
| 257 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
| 258 | { |
| 259 | char buf[128]; |
| 260 | int fd = 0; |
| 261 | int ret = -1; |
| 262 | int pid = inferior_ptid.pid (); |
| 263 | |
| 264 | if (!annex) |
| 265 | return TARGET_XFER_EOF; |
| 266 | |
| 267 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); |
| 268 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); |
| 269 | if (fd <= 0) |
| 270 | return TARGET_XFER_E_IO; |
| 271 | |
| 272 | if (offset != 0 |
| 273 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) |
| 274 | { |
| 275 | close (fd); |
| 276 | return TARGET_XFER_EOF; |
| 277 | } |
| 278 | |
| 279 | if (writebuf) |
| 280 | ret = write (fd, writebuf, (size_t) len); |
| 281 | else if (readbuf) |
| 282 | ret = read (fd, readbuf, (size_t) len); |
| 283 | |
| 284 | close (fd); |
| 285 | if (ret < 0) |
| 286 | return TARGET_XFER_E_IO; |
| 287 | else if (ret == 0) |
| 288 | return TARGET_XFER_EOF; |
| 289 | else |
| 290 | { |
| 291 | *xfered_len = (ULONGEST) ret; |
| 292 | return TARGET_XFER_OK; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | |
| 297 | /* Inferior memory should contain an SPE executable image at location ADDR. |
| 298 | Allocate a BFD representing that executable. Return NULL on error. */ |
| 299 | |
| 300 | static void * |
| 301 | spu_bfd_iovec_open (struct bfd *nbfd, void *open_closure) |
| 302 | { |
| 303 | return open_closure; |
| 304 | } |
| 305 | |
| 306 | static int |
| 307 | spu_bfd_iovec_close (struct bfd *nbfd, void *stream) |
| 308 | { |
| 309 | xfree (stream); |
| 310 | |
| 311 | /* Zero means success. */ |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | static file_ptr |
| 316 | spu_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf, |
| 317 | file_ptr nbytes, file_ptr offset) |
| 318 | { |
| 319 | ULONGEST addr = *(ULONGEST *)stream; |
| 320 | |
| 321 | if (fetch_ppc_memory (addr + offset, (gdb_byte *)buf, nbytes) != 0) |
| 322 | { |
| 323 | bfd_set_error (bfd_error_invalid_operation); |
| 324 | return -1; |
| 325 | } |
| 326 | |
| 327 | return nbytes; |
| 328 | } |
| 329 | |
| 330 | static int |
| 331 | spu_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb) |
| 332 | { |
| 333 | /* We don't have an easy way of finding the size of embedded spu |
| 334 | images. We could parse the in-memory ELF header and section |
| 335 | table to find the extent of the last section but that seems |
| 336 | pointless when the size is needed only for checks of other |
| 337 | parsed values in dbxread.c. */ |
| 338 | memset (sb, 0, sizeof (struct stat)); |
| 339 | sb->st_size = INT_MAX; |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static gdb_bfd_ref_ptr |
| 344 | spu_bfd_open (ULONGEST addr) |
| 345 | { |
| 346 | asection *spu_name; |
| 347 | |
| 348 | ULONGEST *open_closure = XNEW (ULONGEST); |
| 349 | *open_closure = addr; |
| 350 | |
| 351 | gdb_bfd_ref_ptr nbfd (gdb_bfd_openr_iovec ("<in-memory>", "elf32-spu", |
| 352 | spu_bfd_iovec_open, open_closure, |
| 353 | spu_bfd_iovec_pread, |
| 354 | spu_bfd_iovec_close, |
| 355 | spu_bfd_iovec_stat)); |
| 356 | if (nbfd == NULL) |
| 357 | return NULL; |
| 358 | |
| 359 | if (!bfd_check_format (nbfd.get (), bfd_object)) |
| 360 | return NULL; |
| 361 | |
| 362 | /* Retrieve SPU name note and update BFD name. */ |
| 363 | spu_name = bfd_get_section_by_name (nbfd.get (), ".note.spu_name"); |
| 364 | if (spu_name) |
| 365 | { |
| 366 | int sect_size = bfd_section_size (spu_name); |
| 367 | if (sect_size > 20) |
| 368 | { |
| 369 | char *buf = (char *)alloca (sect_size - 20 + 1); |
| 370 | bfd_get_section_contents (nbfd.get (), spu_name, buf, 20, |
| 371 | sect_size - 20); |
| 372 | buf[sect_size - 20] = '\0'; |
| 373 | |
| 374 | bfd_set_filename (nbfd.get (), xstrdup (buf)); |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | return nbfd; |
| 379 | } |
| 380 | |
| 381 | /* INFERIOR_FD is a file handle passed by the inferior to the |
| 382 | spu_run system call. Assuming the SPE context was allocated |
| 383 | by the libspe library, try to retrieve the main SPE executable |
| 384 | file from its copy within the target process. */ |
| 385 | static void |
| 386 | spu_symbol_file_add_from_memory (int inferior_fd) |
| 387 | { |
| 388 | ULONGEST addr; |
| 389 | |
| 390 | gdb_byte id[128]; |
| 391 | char annex[32]; |
| 392 | ULONGEST len; |
| 393 | enum target_xfer_status status; |
| 394 | |
| 395 | /* Read object ID. */ |
| 396 | xsnprintf (annex, sizeof annex, "%d/object-id", inferior_fd); |
| 397 | status = spu_proc_xfer_spu (annex, id, NULL, 0, sizeof id, &len); |
| 398 | if (status != TARGET_XFER_OK || len >= sizeof id) |
| 399 | return; |
| 400 | id[len] = 0; |
| 401 | addr = strtoulst ((const char *) id, NULL, 16); |
| 402 | if (!addr) |
| 403 | return; |
| 404 | |
| 405 | /* Open BFD representing SPE executable and read its symbols. */ |
| 406 | gdb_bfd_ref_ptr nbfd (spu_bfd_open (addr)); |
| 407 | if (nbfd != NULL) |
| 408 | { |
| 409 | symbol_file_add_from_bfd (nbfd.get (), bfd_get_filename (nbfd), |
| 410 | SYMFILE_VERBOSE | SYMFILE_MAINLINE, |
| 411 | NULL, 0, NULL); |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | |
| 416 | /* Override the post_startup_inferior routine to continue running |
| 417 | the inferior until the first spu_run system call. */ |
| 418 | void |
| 419 | spu_linux_nat_target::post_startup_inferior (ptid_t ptid) |
| 420 | { |
| 421 | int fd; |
| 422 | ULONGEST addr; |
| 423 | |
| 424 | int tid = ptid.lwp (); |
| 425 | if (tid == 0) |
| 426 | tid = ptid.pid (); |
| 427 | |
| 428 | while (!parse_spufs_run (&fd, &addr)) |
| 429 | { |
| 430 | ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0); |
| 431 | waitpid (tid, NULL, __WALL | __WNOTHREAD); |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | /* Override the post_attach routine to try load the SPE executable |
| 436 | file image from its copy inside the target process. */ |
| 437 | void |
| 438 | spu_linux_nat_target::post_attach (int pid) |
| 439 | { |
| 440 | int fd; |
| 441 | ULONGEST addr; |
| 442 | |
| 443 | /* Like child_post_startup_inferior, if we happened to attach to |
| 444 | the inferior while it wasn't currently in spu_run, continue |
| 445 | running it until we get back there. */ |
| 446 | while (!parse_spufs_run (&fd, &addr)) |
| 447 | { |
| 448 | ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0); |
| 449 | waitpid (pid, NULL, __WALL | __WNOTHREAD); |
| 450 | } |
| 451 | |
| 452 | /* If the user has not provided an executable file, try to extract |
| 453 | the image from inside the target process. */ |
| 454 | if (!get_exec_file (0)) |
| 455 | spu_symbol_file_add_from_memory (fd); |
| 456 | } |
| 457 | |
| 458 | /* Wait for child PTID to do something. Return id of the child, |
| 459 | minus_one_ptid in case of error; store status into *OURSTATUS. */ |
| 460 | ptid_t |
| 461 | spu_linux_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, |
| 462 | int options) |
| 463 | { |
| 464 | int save_errno; |
| 465 | int status; |
| 466 | pid_t pid; |
| 467 | |
| 468 | do |
| 469 | { |
| 470 | set_sigint_trap (); /* Causes SIGINT to be passed on to the |
| 471 | attached process. */ |
| 472 | |
| 473 | pid = waitpid (ptid.pid (), &status, 0); |
| 474 | if (pid == -1 && errno == ECHILD) |
| 475 | /* Try again with __WCLONE to check cloned processes. */ |
| 476 | pid = waitpid (ptid.pid (), &status, __WCLONE); |
| 477 | |
| 478 | save_errno = errno; |
| 479 | |
| 480 | /* Make sure we don't report an event for the exit of the |
| 481 | original program, if we've detached from it. */ |
| 482 | if (pid != -1 && !WIFSTOPPED (status) |
| 483 | && pid != inferior_ptid.pid ()) |
| 484 | { |
| 485 | pid = -1; |
| 486 | save_errno = EINTR; |
| 487 | } |
| 488 | |
| 489 | clear_sigint_trap (); |
| 490 | } |
| 491 | while (pid == -1 && save_errno == EINTR); |
| 492 | |
| 493 | if (pid == -1) |
| 494 | { |
| 495 | warning (_("Child process unexpectedly missing: %s"), |
| 496 | safe_strerror (save_errno)); |
| 497 | |
| 498 | /* Claim it exited with unknown signal. */ |
| 499 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 500 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
| 501 | return inferior_ptid; |
| 502 | } |
| 503 | |
| 504 | store_waitstatus (ourstatus, status); |
| 505 | return ptid_t (pid); |
| 506 | } |
| 507 | |
| 508 | /* Override the fetch_inferior_register routine. */ |
| 509 | void |
| 510 | spu_linux_nat_target::fetch_registers (struct regcache *regcache, int regno) |
| 511 | { |
| 512 | int fd; |
| 513 | ULONGEST addr; |
| 514 | |
| 515 | /* Since we use functions that rely on inferior_ptid, we need to set and |
| 516 | restore it. */ |
| 517 | scoped_restore save_ptid |
| 518 | = make_scoped_restore (&inferior_ptid, regcache->ptid ()); |
| 519 | |
| 520 | /* We must be stopped on a spu_run system call. */ |
| 521 | if (!parse_spufs_run (&fd, &addr)) |
| 522 | return; |
| 523 | |
| 524 | /* The ID register holds the spufs file handle. */ |
| 525 | if (regno == -1 || regno == SPU_ID_REGNUM) |
| 526 | { |
| 527 | struct gdbarch *gdbarch = regcache->arch (); |
| 528 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 529 | gdb_byte buf[4]; |
| 530 | store_unsigned_integer (buf, 4, byte_order, fd); |
| 531 | regcache->raw_supply (SPU_ID_REGNUM, buf); |
| 532 | } |
| 533 | |
| 534 | /* The NPC register is found at ADDR. */ |
| 535 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 536 | { |
| 537 | gdb_byte buf[4]; |
| 538 | if (fetch_ppc_memory (addr, buf, 4) == 0) |
| 539 | regcache->raw_supply (SPU_PC_REGNUM, buf); |
| 540 | } |
| 541 | |
| 542 | /* The GPRs are found in the "regs" spufs file. */ |
| 543 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) |
| 544 | { |
| 545 | gdb_byte buf[16 * SPU_NUM_GPRS]; |
| 546 | char annex[32]; |
| 547 | int i; |
| 548 | ULONGEST len; |
| 549 | |
| 550 | xsnprintf (annex, sizeof annex, "%d/regs", fd); |
| 551 | if ((spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf, &len) |
| 552 | == TARGET_XFER_OK) |
| 553 | && len == sizeof buf) |
| 554 | for (i = 0; i < SPU_NUM_GPRS; i++) |
| 555 | regcache->raw_supply (i, buf + i*16); |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | /* Override the store_inferior_register routine. */ |
| 560 | void |
| 561 | spu_linux_nat_target::store_registers (struct regcache *regcache, int regno) |
| 562 | { |
| 563 | int fd; |
| 564 | ULONGEST addr; |
| 565 | |
| 566 | /* Since we use functions that rely on inferior_ptid, we need to set and |
| 567 | restore it. */ |
| 568 | scoped_restore save_ptid |
| 569 | = make_scoped_restore (&inferior_ptid, regcache->ptid ()); |
| 570 | |
| 571 | /* We must be stopped on a spu_run system call. */ |
| 572 | if (!parse_spufs_run (&fd, &addr)) |
| 573 | return; |
| 574 | |
| 575 | /* The NPC register is found at ADDR. */ |
| 576 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 577 | { |
| 578 | gdb_byte buf[4]; |
| 579 | regcache->raw_collect (SPU_PC_REGNUM, buf); |
| 580 | store_ppc_memory (addr, buf, 4); |
| 581 | } |
| 582 | |
| 583 | /* The GPRs are found in the "regs" spufs file. */ |
| 584 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) |
| 585 | { |
| 586 | gdb_byte buf[16 * SPU_NUM_GPRS]; |
| 587 | char annex[32]; |
| 588 | int i; |
| 589 | ULONGEST len; |
| 590 | |
| 591 | for (i = 0; i < SPU_NUM_GPRS; i++) |
| 592 | regcache->raw_collect (i, buf + i*16); |
| 593 | |
| 594 | xsnprintf (annex, sizeof annex, "%d/regs", fd); |
| 595 | spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf, &len); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | /* Override the to_xfer_partial routine. */ |
| 600 | enum target_xfer_status |
| 601 | spu_linux_nat_target::xfer_partial (enum target_object object, const char *annex, |
| 602 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 603 | ULONGEST offset, ULONGEST len, |
| 604 | ULONGEST *xfered_len) |
| 605 | { |
| 606 | if (object == TARGET_OBJECT_SPU) |
| 607 | return spu_proc_xfer_spu (annex, readbuf, writebuf, offset, len, |
| 608 | xfered_len); |
| 609 | |
| 610 | if (object == TARGET_OBJECT_MEMORY) |
| 611 | { |
| 612 | int fd; |
| 613 | ULONGEST addr; |
| 614 | char mem_annex[32], lslr_annex[32]; |
| 615 | gdb_byte buf[32]; |
| 616 | ULONGEST lslr; |
| 617 | enum target_xfer_status ret; |
| 618 | |
| 619 | /* We must be stopped on a spu_run system call. */ |
| 620 | if (!parse_spufs_run (&fd, &addr)) |
| 621 | return TARGET_XFER_EOF; |
| 622 | |
| 623 | /* Use the "mem" spufs file to access SPU local store. */ |
| 624 | xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd); |
| 625 | ret = spu_proc_xfer_spu (mem_annex, readbuf, writebuf, offset, len, |
| 626 | xfered_len); |
| 627 | if (ret == TARGET_XFER_OK) |
| 628 | return ret; |
| 629 | |
| 630 | /* SPU local store access wraps the address around at the |
| 631 | local store limit. We emulate this here. To avoid needing |
| 632 | an extra access to retrieve the LSLR, we only do that after |
| 633 | trying the original address first, and getting end-of-file. */ |
| 634 | xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd); |
| 635 | memset (buf, 0, sizeof buf); |
| 636 | if (spu_proc_xfer_spu (lslr_annex, buf, NULL, 0, sizeof buf, xfered_len) |
| 637 | != TARGET_XFER_OK) |
| 638 | return ret; |
| 639 | |
| 640 | lslr = strtoulst ((const char *) buf, NULL, 16); |
| 641 | return spu_proc_xfer_spu (mem_annex, readbuf, writebuf, |
| 642 | offset & lslr, len, xfered_len); |
| 643 | } |
| 644 | |
| 645 | return TARGET_XFER_E_IO; |
| 646 | } |
| 647 | |
| 648 | /* Override the to_can_use_hw_breakpoint routine. */ |
| 649 | int |
| 650 | spu_linux_nat_target::can_use_hw_breakpoint (enum bptype type, |
| 651 | int cnt, int othertype) |
| 652 | { |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | /* Initialize SPU native target. */ |
| 657 | void |
| 658 | _initialize_spu_nat (void) |
| 659 | { |
| 660 | add_inf_child_target (&the_spu_linux_nat_target); |
| 661 | } |