| 1 | /* Low level interface to SPUs, for the remote server for GDB. |
| 2 | Copyright (C) 2006-2016 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 "server.h" |
| 22 | |
| 23 | #include "gdb_wait.h" |
| 24 | #include <sys/ptrace.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <unistd.h> |
| 27 | #include <sys/syscall.h> |
| 28 | #include "filestuff.h" |
| 29 | #include "hostio.h" |
| 30 | |
| 31 | /* Some older glibc versions do not define this. */ |
| 32 | #ifndef __WNOTHREAD |
| 33 | #define __WNOTHREAD 0x20000000 /* Don't wait on children of other |
| 34 | threads in this group */ |
| 35 | #endif |
| 36 | |
| 37 | #define PTRACE_TYPE_RET long |
| 38 | #define PTRACE_TYPE_ARG3 long |
| 39 | |
| 40 | /* Number of registers. */ |
| 41 | #define SPU_NUM_REGS 130 |
| 42 | #define SPU_NUM_CORE_REGS 128 |
| 43 | |
| 44 | /* Special registers. */ |
| 45 | #define SPU_ID_REGNUM 128 |
| 46 | #define SPU_PC_REGNUM 129 |
| 47 | |
| 48 | /* PPU side system calls. */ |
| 49 | #define INSTR_SC 0x44000002 |
| 50 | #define NR_spu_run 0x0116 |
| 51 | |
| 52 | /* These are used in remote-utils.c. */ |
| 53 | int using_threads = 0; |
| 54 | |
| 55 | /* Defined in auto-generated file reg-spu.c. */ |
| 56 | void init_registers_spu (void); |
| 57 | extern const struct target_desc *tdesc_spu; |
| 58 | |
| 59 | /* Software breakpoint instruction. */ |
| 60 | static const gdb_byte breakpoint[] = { 0x00, 0x00, 0x3f, 0xff }; |
| 61 | |
| 62 | /* Fetch PPU register REGNO. */ |
| 63 | static CORE_ADDR |
| 64 | fetch_ppc_register (int regno) |
| 65 | { |
| 66 | PTRACE_TYPE_RET res; |
| 67 | |
| 68 | int tid = ptid_get_lwp (current_ptid); |
| 69 | |
| 70 | #ifndef __powerpc64__ |
| 71 | /* If running as a 32-bit process on a 64-bit system, we attempt |
| 72 | to get the full 64-bit register content of the target process. |
| 73 | If the PPC special ptrace call fails, we're on a 32-bit system; |
| 74 | just fall through to the regular ptrace call in that case. */ |
| 75 | { |
| 76 | char buf[8]; |
| 77 | |
| 78 | errno = 0; |
| 79 | ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_PEEKUSR_3264, tid, |
| 80 | (PTRACE_TYPE_ARG3) (regno * 8), buf); |
| 81 | if (errno == 0) |
| 82 | ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_PEEKUSR_3264, tid, |
| 83 | (PTRACE_TYPE_ARG3) (regno * 8 + 4), buf + 4); |
| 84 | if (errno == 0) |
| 85 | return (CORE_ADDR) *(unsigned long long *)buf; |
| 86 | } |
| 87 | #endif |
| 88 | |
| 89 | errno = 0; |
| 90 | res = ptrace (PT_READ_U, tid, |
| 91 | (PTRACE_TYPE_ARG3) (regno * sizeof (PTRACE_TYPE_RET)), 0); |
| 92 | if (errno != 0) |
| 93 | { |
| 94 | char mess[128]; |
| 95 | sprintf (mess, "reading PPC register #%d", regno); |
| 96 | perror_with_name (mess); |
| 97 | } |
| 98 | |
| 99 | return (CORE_ADDR) (unsigned long) res; |
| 100 | } |
| 101 | |
| 102 | /* Fetch WORD from PPU memory at (aligned) MEMADDR in thread TID. */ |
| 103 | static int |
| 104 | fetch_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET *word) |
| 105 | { |
| 106 | errno = 0; |
| 107 | |
| 108 | #ifndef __powerpc64__ |
| 109 | if (memaddr >> 32) |
| 110 | { |
| 111 | unsigned long long addr_8 = (unsigned long long) memaddr; |
| 112 | ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_PEEKTEXT_3264, tid, |
| 113 | (PTRACE_TYPE_ARG3) &addr_8, word); |
| 114 | } |
| 115 | else |
| 116 | #endif |
| 117 | *word = ptrace (PT_READ_I, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, 0); |
| 118 | |
| 119 | return errno; |
| 120 | } |
| 121 | |
| 122 | /* Store WORD into PPU memory at (aligned) MEMADDR in thread TID. */ |
| 123 | static int |
| 124 | store_ppc_memory_1 (int tid, CORE_ADDR memaddr, PTRACE_TYPE_RET word) |
| 125 | { |
| 126 | errno = 0; |
| 127 | |
| 128 | #ifndef __powerpc64__ |
| 129 | if (memaddr >> 32) |
| 130 | { |
| 131 | unsigned long long addr_8 = (unsigned long long) memaddr; |
| 132 | ptrace ((PTRACE_TYPE_ARG1) PPC_PTRACE_POKEDATA_3264, tid, |
| 133 | (PTRACE_TYPE_ARG3) &addr_8, word); |
| 134 | } |
| 135 | else |
| 136 | #endif |
| 137 | ptrace (PT_WRITE_D, tid, (PTRACE_TYPE_ARG3) (size_t) memaddr, word); |
| 138 | |
| 139 | return errno; |
| 140 | } |
| 141 | |
| 142 | /* Fetch LEN bytes of PPU memory at MEMADDR to MYADDR. */ |
| 143 | static int |
| 144 | fetch_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len) |
| 145 | { |
| 146 | int i, ret; |
| 147 | |
| 148 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); |
| 149 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
| 150 | / sizeof (PTRACE_TYPE_RET)); |
| 151 | PTRACE_TYPE_RET *buffer; |
| 152 | |
| 153 | int tid = ptid_get_lwp (current_ptid); |
| 154 | |
| 155 | buffer = XALLOCAVEC (PTRACE_TYPE_RET, count); |
| 156 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 157 | if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[i])) != 0) |
| 158 | return ret; |
| 159 | |
| 160 | memcpy (myaddr, |
| 161 | (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 162 | len); |
| 163 | |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | /* Store LEN bytes from MYADDR to PPU memory at MEMADDR. */ |
| 168 | static int |
| 169 | store_ppc_memory (CORE_ADDR memaddr, char *myaddr, int len) |
| 170 | { |
| 171 | int i, ret; |
| 172 | |
| 173 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); |
| 174 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
| 175 | / sizeof (PTRACE_TYPE_RET)); |
| 176 | PTRACE_TYPE_RET *buffer; |
| 177 | |
| 178 | int tid = ptid_get_lwp (current_ptid); |
| 179 | |
| 180 | buffer = XALLOCAVEC (PTRACE_TYPE_RET, count); |
| 181 | |
| 182 | if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET)) |
| 183 | if ((ret = fetch_ppc_memory_1 (tid, addr, &buffer[0])) != 0) |
| 184 | return ret; |
| 185 | |
| 186 | if (count > 1) |
| 187 | if ((ret = fetch_ppc_memory_1 (tid, addr + (count - 1) |
| 188 | * sizeof (PTRACE_TYPE_RET), |
| 189 | &buffer[count - 1])) != 0) |
| 190 | return ret; |
| 191 | |
| 192 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 193 | myaddr, len); |
| 194 | |
| 195 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 196 | if ((ret = store_ppc_memory_1 (tid, addr, buffer[i])) != 0) |
| 197 | return ret; |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | |
| 203 | /* If the PPU thread is currently stopped on a spu_run system call, |
| 204 | return to FD and ADDR the file handle and NPC parameter address |
| 205 | used with the system call. Return non-zero if successful. */ |
| 206 | static int |
| 207 | parse_spufs_run (int *fd, CORE_ADDR *addr) |
| 208 | { |
| 209 | unsigned int insn; |
| 210 | CORE_ADDR pc = fetch_ppc_register (32); /* nip */ |
| 211 | |
| 212 | /* Fetch instruction preceding current NIP. */ |
| 213 | if (fetch_ppc_memory (pc-4, (char *) &insn, 4) != 0) |
| 214 | return 0; |
| 215 | /* It should be a "sc" instruction. */ |
| 216 | if (insn != INSTR_SC) |
| 217 | return 0; |
| 218 | /* System call number should be NR_spu_run. */ |
| 219 | if (fetch_ppc_register (0) != NR_spu_run) |
| 220 | return 0; |
| 221 | |
| 222 | /* Register 3 contains fd, register 4 the NPC param pointer. */ |
| 223 | *fd = fetch_ppc_register (34); /* orig_gpr3 */ |
| 224 | *addr = fetch_ppc_register (4); |
| 225 | return 1; |
| 226 | } |
| 227 | |
| 228 | |
| 229 | /* Copy LEN bytes at OFFSET in spufs file ANNEX into/from READBUF or WRITEBUF, |
| 230 | using the /proc file system. */ |
| 231 | static int |
| 232 | spu_proc_xfer_spu (const char *annex, unsigned char *readbuf, |
| 233 | const unsigned char *writebuf, |
| 234 | CORE_ADDR offset, int len) |
| 235 | { |
| 236 | char buf[128]; |
| 237 | int fd = 0; |
| 238 | int ret = -1; |
| 239 | |
| 240 | if (!annex) |
| 241 | return 0; |
| 242 | |
| 243 | sprintf (buf, "/proc/%ld/fd/%s", ptid_get_lwp (current_ptid), annex); |
| 244 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); |
| 245 | if (fd <= 0) |
| 246 | return -1; |
| 247 | |
| 248 | if (offset != 0 |
| 249 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) |
| 250 | { |
| 251 | close (fd); |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | if (writebuf) |
| 256 | ret = write (fd, writebuf, (size_t) len); |
| 257 | else if (readbuf) |
| 258 | ret = read (fd, readbuf, (size_t) len); |
| 259 | |
| 260 | close (fd); |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | |
| 265 | /* Start an inferior process and returns its pid. |
| 266 | ALLARGS is a vector of program-name and args. */ |
| 267 | static int |
| 268 | spu_create_inferior (char *program, char **allargs) |
| 269 | { |
| 270 | int pid; |
| 271 | ptid_t ptid; |
| 272 | struct process_info *proc; |
| 273 | |
| 274 | pid = fork (); |
| 275 | if (pid < 0) |
| 276 | perror_with_name ("fork"); |
| 277 | |
| 278 | if (pid == 0) |
| 279 | { |
| 280 | close_most_fds (); |
| 281 | ptrace (PTRACE_TRACEME, 0, 0, 0); |
| 282 | |
| 283 | setpgid (0, 0); |
| 284 | |
| 285 | execv (program, allargs); |
| 286 | if (errno == ENOENT) |
| 287 | execvp (program, allargs); |
| 288 | |
| 289 | fprintf (stderr, "Cannot exec %s: %s.\n", program, |
| 290 | strerror (errno)); |
| 291 | fflush (stderr); |
| 292 | _exit (0177); |
| 293 | } |
| 294 | |
| 295 | proc = add_process (pid, 0); |
| 296 | proc->tdesc = tdesc_spu; |
| 297 | |
| 298 | ptid = ptid_build (pid, pid, 0); |
| 299 | add_thread (ptid, NULL); |
| 300 | return pid; |
| 301 | } |
| 302 | |
| 303 | /* Attach to an inferior process. */ |
| 304 | int |
| 305 | spu_attach (unsigned long pid) |
| 306 | { |
| 307 | ptid_t ptid; |
| 308 | struct process_info *proc; |
| 309 | |
| 310 | if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0) |
| 311 | { |
| 312 | fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid, |
| 313 | strerror (errno), errno); |
| 314 | fflush (stderr); |
| 315 | _exit (0177); |
| 316 | } |
| 317 | |
| 318 | proc = add_process (pid, 1); |
| 319 | proc->tdesc = tdesc_spu; |
| 320 | ptid = ptid_build (pid, pid, 0); |
| 321 | add_thread (ptid, NULL); |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | /* Kill the inferior process. */ |
| 326 | static int |
| 327 | spu_kill (int pid) |
| 328 | { |
| 329 | int status, ret; |
| 330 | struct process_info *process = find_process_pid (pid); |
| 331 | if (process == NULL) |
| 332 | return -1; |
| 333 | |
| 334 | ptrace (PTRACE_KILL, pid, 0, 0); |
| 335 | |
| 336 | do { |
| 337 | ret = waitpid (pid, &status, 0); |
| 338 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
| 339 | break; |
| 340 | } while (ret != -1 || errno != ECHILD); |
| 341 | |
| 342 | clear_inferiors (); |
| 343 | remove_process (process); |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | /* Detach from inferior process. */ |
| 348 | static int |
| 349 | spu_detach (int pid) |
| 350 | { |
| 351 | struct process_info *process = find_process_pid (pid); |
| 352 | if (process == NULL) |
| 353 | return -1; |
| 354 | |
| 355 | ptrace (PTRACE_DETACH, pid, 0, 0); |
| 356 | |
| 357 | clear_inferiors (); |
| 358 | remove_process (process); |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | static void |
| 363 | spu_mourn (struct process_info *process) |
| 364 | { |
| 365 | remove_process (process); |
| 366 | } |
| 367 | |
| 368 | static void |
| 369 | spu_join (int pid) |
| 370 | { |
| 371 | int status, ret; |
| 372 | |
| 373 | do { |
| 374 | ret = waitpid (pid, &status, 0); |
| 375 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
| 376 | break; |
| 377 | } while (ret != -1 || errno != ECHILD); |
| 378 | } |
| 379 | |
| 380 | /* Return nonzero if the given thread is still alive. */ |
| 381 | static int |
| 382 | spu_thread_alive (ptid_t ptid) |
| 383 | { |
| 384 | return ptid_equal (ptid, current_ptid); |
| 385 | } |
| 386 | |
| 387 | /* Resume process. */ |
| 388 | static void |
| 389 | spu_resume (struct thread_resume *resume_info, size_t n) |
| 390 | { |
| 391 | struct thread_info *thr = get_first_thread (); |
| 392 | size_t i; |
| 393 | |
| 394 | for (i = 0; i < n; i++) |
| 395 | if (ptid_equal (resume_info[i].thread, minus_one_ptid) |
| 396 | || ptid_equal (resume_info[i].thread, ptid_of (thr))) |
| 397 | break; |
| 398 | |
| 399 | if (i == n) |
| 400 | return; |
| 401 | |
| 402 | /* We don't support hardware single-stepping right now, assume |
| 403 | GDB knows to use software single-stepping. */ |
| 404 | if (resume_info[i].kind == resume_step) |
| 405 | fprintf (stderr, "Hardware single-step not supported.\n"); |
| 406 | |
| 407 | regcache_invalidate (); |
| 408 | |
| 409 | errno = 0; |
| 410 | ptrace (PTRACE_CONT, ptid_get_lwp (ptid_of (thr)), 0, resume_info[i].sig); |
| 411 | if (errno) |
| 412 | perror_with_name ("ptrace"); |
| 413 | } |
| 414 | |
| 415 | /* Wait for process, returns status. */ |
| 416 | static ptid_t |
| 417 | spu_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
| 418 | { |
| 419 | int pid = ptid_get_pid (ptid); |
| 420 | int w; |
| 421 | int ret; |
| 422 | |
| 423 | while (1) |
| 424 | { |
| 425 | ret = waitpid (pid, &w, WNOHANG | __WALL | __WNOTHREAD); |
| 426 | |
| 427 | if (ret == -1) |
| 428 | { |
| 429 | if (errno != ECHILD) |
| 430 | perror_with_name ("waitpid"); |
| 431 | } |
| 432 | else if (ret > 0) |
| 433 | break; |
| 434 | |
| 435 | usleep (1000); |
| 436 | } |
| 437 | |
| 438 | /* On the first wait, continue running the inferior until we are |
| 439 | blocked inside an spu_run system call. */ |
| 440 | if (!server_waiting) |
| 441 | { |
| 442 | int fd; |
| 443 | CORE_ADDR addr; |
| 444 | |
| 445 | while (!parse_spufs_run (&fd, &addr)) |
| 446 | { |
| 447 | ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0); |
| 448 | waitpid (pid, NULL, __WALL | __WNOTHREAD); |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | if (WIFEXITED (w)) |
| 453 | { |
| 454 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); |
| 455 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
| 456 | ourstatus->value.integer = WEXITSTATUS (w); |
| 457 | clear_inferiors (); |
| 458 | return pid_to_ptid (ret); |
| 459 | } |
| 460 | else if (!WIFSTOPPED (w)) |
| 461 | { |
| 462 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); |
| 463 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 464 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); |
| 465 | clear_inferiors (); |
| 466 | return pid_to_ptid (ret); |
| 467 | } |
| 468 | |
| 469 | /* After attach, we may have received a SIGSTOP. Do not return this |
| 470 | as signal to GDB, or else it will try to continue with SIGSTOP ... */ |
| 471 | if (!server_waiting) |
| 472 | { |
| 473 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 474 | ourstatus->value.sig = GDB_SIGNAL_0; |
| 475 | return ptid_build (ret, ret, 0); |
| 476 | } |
| 477 | |
| 478 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 479 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
| 480 | return ptid_build (ret, ret, 0); |
| 481 | } |
| 482 | |
| 483 | /* Fetch inferior registers. */ |
| 484 | static void |
| 485 | spu_fetch_registers (struct regcache *regcache, int regno) |
| 486 | { |
| 487 | int fd; |
| 488 | CORE_ADDR addr; |
| 489 | |
| 490 | /* We must be stopped on a spu_run system call. */ |
| 491 | if (!parse_spufs_run (&fd, &addr)) |
| 492 | return; |
| 493 | |
| 494 | /* The ID register holds the spufs file handle. */ |
| 495 | if (regno == -1 || regno == SPU_ID_REGNUM) |
| 496 | supply_register (regcache, SPU_ID_REGNUM, (char *)&fd); |
| 497 | |
| 498 | /* The NPC register is found at ADDR. */ |
| 499 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 500 | { |
| 501 | char buf[4]; |
| 502 | if (fetch_ppc_memory (addr, buf, 4) == 0) |
| 503 | supply_register (regcache, SPU_PC_REGNUM, buf); |
| 504 | } |
| 505 | |
| 506 | /* The GPRs are found in the "regs" spufs file. */ |
| 507 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS)) |
| 508 | { |
| 509 | unsigned char buf[16*SPU_NUM_CORE_REGS]; |
| 510 | char annex[32]; |
| 511 | int i; |
| 512 | |
| 513 | sprintf (annex, "%d/regs", fd); |
| 514 | if (spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf) == sizeof buf) |
| 515 | for (i = 0; i < SPU_NUM_CORE_REGS; i++) |
| 516 | supply_register (regcache, i, buf + i*16); |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | /* Store inferior registers. */ |
| 521 | static void |
| 522 | spu_store_registers (struct regcache *regcache, int regno) |
| 523 | { |
| 524 | int fd; |
| 525 | CORE_ADDR addr; |
| 526 | |
| 527 | /* ??? Some callers use 0 to mean all registers. */ |
| 528 | if (regno == 0) |
| 529 | regno = -1; |
| 530 | |
| 531 | /* We must be stopped on a spu_run system call. */ |
| 532 | if (!parse_spufs_run (&fd, &addr)) |
| 533 | return; |
| 534 | |
| 535 | /* The NPC register is found at ADDR. */ |
| 536 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 537 | { |
| 538 | char buf[4]; |
| 539 | collect_register (regcache, SPU_PC_REGNUM, buf); |
| 540 | store_ppc_memory (addr, buf, 4); |
| 541 | } |
| 542 | |
| 543 | /* The GPRs are found in the "regs" spufs file. */ |
| 544 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_CORE_REGS)) |
| 545 | { |
| 546 | unsigned char buf[16*SPU_NUM_CORE_REGS]; |
| 547 | char annex[32]; |
| 548 | int i; |
| 549 | |
| 550 | for (i = 0; i < SPU_NUM_CORE_REGS; i++) |
| 551 | collect_register (regcache, i, buf + i*16); |
| 552 | |
| 553 | sprintf (annex, "%d/regs", fd); |
| 554 | spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf); |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
| 559 | to debugger memory starting at MYADDR. */ |
| 560 | static int |
| 561 | spu_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
| 562 | { |
| 563 | int fd, ret; |
| 564 | CORE_ADDR addr; |
| 565 | char annex[32], lslr_annex[32], buf[32]; |
| 566 | CORE_ADDR lslr; |
| 567 | |
| 568 | /* We must be stopped on a spu_run system call. */ |
| 569 | if (!parse_spufs_run (&fd, &addr)) |
| 570 | return 0; |
| 571 | |
| 572 | /* Use the "mem" spufs file to access SPU local store. */ |
| 573 | sprintf (annex, "%d/mem", fd); |
| 574 | ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr, len); |
| 575 | if (ret > 0) |
| 576 | return ret == len ? 0 : EIO; |
| 577 | |
| 578 | /* SPU local store access wraps the address around at the |
| 579 | local store limit. We emulate this here. To avoid needing |
| 580 | an extra access to retrieve the LSLR, we only do that after |
| 581 | trying the original address first, and getting end-of-file. */ |
| 582 | sprintf (lslr_annex, "%d/lslr", fd); |
| 583 | memset (buf, 0, sizeof buf); |
| 584 | if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL, |
| 585 | 0, sizeof buf) <= 0) |
| 586 | return ret; |
| 587 | |
| 588 | lslr = strtoul (buf, NULL, 16); |
| 589 | ret = spu_proc_xfer_spu (annex, myaddr, NULL, memaddr & lslr, len); |
| 590 | |
| 591 | return ret == len ? 0 : EIO; |
| 592 | } |
| 593 | |
| 594 | /* Copy LEN bytes of data from debugger memory at MYADDR |
| 595 | to inferior's memory at MEMADDR. |
| 596 | On failure (cannot write the inferior) |
| 597 | returns the value of errno. */ |
| 598 | static int |
| 599 | spu_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
| 600 | { |
| 601 | int fd, ret; |
| 602 | CORE_ADDR addr; |
| 603 | char annex[32], lslr_annex[32], buf[32]; |
| 604 | CORE_ADDR lslr; |
| 605 | |
| 606 | /* We must be stopped on a spu_run system call. */ |
| 607 | if (!parse_spufs_run (&fd, &addr)) |
| 608 | return 0; |
| 609 | |
| 610 | /* Use the "mem" spufs file to access SPU local store. */ |
| 611 | sprintf (annex, "%d/mem", fd); |
| 612 | ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr, len); |
| 613 | if (ret > 0) |
| 614 | return ret == len ? 0 : EIO; |
| 615 | |
| 616 | /* SPU local store access wraps the address around at the |
| 617 | local store limit. We emulate this here. To avoid needing |
| 618 | an extra access to retrieve the LSLR, we only do that after |
| 619 | trying the original address first, and getting end-of-file. */ |
| 620 | sprintf (lslr_annex, "%d/lslr", fd); |
| 621 | memset (buf, 0, sizeof buf); |
| 622 | if (spu_proc_xfer_spu (lslr_annex, (unsigned char *)buf, NULL, |
| 623 | 0, sizeof buf) <= 0) |
| 624 | return ret; |
| 625 | |
| 626 | lslr = strtoul (buf, NULL, 16); |
| 627 | ret = spu_proc_xfer_spu (annex, NULL, myaddr, memaddr & lslr, len); |
| 628 | |
| 629 | return ret == len ? 0 : EIO; |
| 630 | } |
| 631 | |
| 632 | /* Look up special symbols -- unneded here. */ |
| 633 | static void |
| 634 | spu_look_up_symbols (void) |
| 635 | { |
| 636 | } |
| 637 | |
| 638 | /* Send signal to inferior. */ |
| 639 | static void |
| 640 | spu_request_interrupt (void) |
| 641 | { |
| 642 | struct thread_info *thr = get_first_thread (); |
| 643 | |
| 644 | syscall (SYS_tkill, lwpid_of (thr), SIGINT); |
| 645 | } |
| 646 | |
| 647 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ |
| 648 | |
| 649 | static const gdb_byte * |
| 650 | spu_sw_breakpoint_from_kind (int kind, int *size) |
| 651 | { |
| 652 | *size = sizeof breakpoint; |
| 653 | return breakpoint; |
| 654 | } |
| 655 | |
| 656 | static struct target_ops spu_target_ops = { |
| 657 | spu_create_inferior, |
| 658 | NULL, /* post_create_inferior */ |
| 659 | spu_attach, |
| 660 | spu_kill, |
| 661 | spu_detach, |
| 662 | spu_mourn, |
| 663 | spu_join, |
| 664 | spu_thread_alive, |
| 665 | spu_resume, |
| 666 | spu_wait, |
| 667 | spu_fetch_registers, |
| 668 | spu_store_registers, |
| 669 | NULL, /* prepare_to_access_memory */ |
| 670 | NULL, /* done_accessing_memory */ |
| 671 | spu_read_memory, |
| 672 | spu_write_memory, |
| 673 | spu_look_up_symbols, |
| 674 | spu_request_interrupt, |
| 675 | NULL, |
| 676 | NULL, /* supports_z_point_type */ |
| 677 | NULL, |
| 678 | NULL, |
| 679 | NULL, /* stopped_by_sw_breakpoint */ |
| 680 | NULL, /* supports_stopped_by_sw_breakpoint */ |
| 681 | NULL, /* stopped_by_hw_breakpoint */ |
| 682 | NULL, /* supports_stopped_by_hw_breakpoint */ |
| 683 | NULL, /* supports_hardware_single_step */ |
| 684 | NULL, |
| 685 | NULL, |
| 686 | NULL, |
| 687 | NULL, |
| 688 | spu_proc_xfer_spu, |
| 689 | hostio_last_error_from_errno, |
| 690 | NULL, /* qxfer_osdata */ |
| 691 | NULL, /* qxfer_siginfo */ |
| 692 | NULL, /* supports_non_stop */ |
| 693 | NULL, /* async */ |
| 694 | NULL, /* start_non_stop */ |
| 695 | NULL, /* supports_multi_process */ |
| 696 | NULL, /* supports_fork_events */ |
| 697 | NULL, /* supports_vfork_events */ |
| 698 | NULL, /* supports_exec_events */ |
| 699 | NULL, /* handle_new_gdb_connection */ |
| 700 | NULL, /* handle_monitor_command */ |
| 701 | NULL, /* core_of_thread */ |
| 702 | NULL, /* read_loadmap */ |
| 703 | NULL, /* process_qsupported */ |
| 704 | NULL, /* supports_tracepoints */ |
| 705 | NULL, /* read_pc */ |
| 706 | NULL, /* write_pc */ |
| 707 | NULL, /* thread_stopped */ |
| 708 | NULL, /* get_tib_address */ |
| 709 | NULL, /* pause_all */ |
| 710 | NULL, /* unpause_all */ |
| 711 | NULL, /* stabilize_threads */ |
| 712 | NULL, /* install_fast_tracepoint_jump_pad */ |
| 713 | NULL, /* emit_ops */ |
| 714 | NULL, /* supports_disable_randomization */ |
| 715 | NULL, /* get_min_fast_tracepoint_insn_len */ |
| 716 | NULL, /* qxfer_libraries_svr4 */ |
| 717 | NULL, /* support_agent */ |
| 718 | NULL, /* support_btrace */ |
| 719 | NULL, /* enable_btrace */ |
| 720 | NULL, /* disable_btrace */ |
| 721 | NULL, /* read_btrace */ |
| 722 | NULL, /* read_btrace_conf */ |
| 723 | NULL, /* supports_range_stepping */ |
| 724 | NULL, /* pid_to_exec_file */ |
| 725 | NULL, /* multifs_open */ |
| 726 | NULL, /* multifs_unlink */ |
| 727 | NULL, /* multifs_readlink */ |
| 728 | NULL, /* breakpoint_kind_from_pc */ |
| 729 | spu_sw_breakpoint_from_kind, |
| 730 | }; |
| 731 | |
| 732 | void |
| 733 | initialize_low (void) |
| 734 | { |
| 735 | set_target_ops (&spu_target_ops); |
| 736 | init_registers_spu (); |
| 737 | } |