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