gdb/spu-linux-nat.c

   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 "common/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 (nbfd.get (), 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           xfree ((char *)nbfd->filename);
 375           nbfd->filename = xstrdup (buf);
 376         }
 377     }
 378
 379   return nbfd;
 380 }
 381
 382 /* INFERIOR_FD is a file handle passed by the inferior to the
 383    spu_run system call.  Assuming the SPE context was allocated
 384    by the libspe library, try to retrieve the main SPE executable
 385    file from its copy within the target process.  */
 386 static void
 387 spu_symbol_file_add_from_memory (int inferior_fd)
 388 {
 389   ULONGEST addr;
 390
 391   gdb_byte id[128];
 392   char annex[32];
 393   ULONGEST len;
 394   enum target_xfer_status status;
 395
 396   /* Read object ID.  */
 397   xsnprintf (annex, sizeof annex, "%d/object-id", inferior_fd);
 398   status = spu_proc_xfer_spu (annex, id, NULL, 0, sizeof id, &len);
 399   if (status != TARGET_XFER_OK || len >= sizeof id)
 400     return;
 401   id[len] = 0;
 402   addr = strtoulst ((const char *) id, NULL, 16);
 403   if (!addr)
 404     return;
 405
 406   /* Open BFD representing SPE executable and read its symbols.  */
 407   gdb_bfd_ref_ptr nbfd (spu_bfd_open (addr));
 408   if (nbfd != NULL)
 409     {
 410       symbol_file_add_from_bfd (nbfd.get (), bfd_get_filename (nbfd),
 411                                 SYMFILE_VERBOSE | SYMFILE_MAINLINE,
 412                                 NULL, 0, NULL);
 413     }
 414 }
 415
 416
 417 /* Override the post_startup_inferior routine to continue running
 418    the inferior until the first spu_run system call.  */
 419 void
 420 spu_linux_nat_target::post_startup_inferior (ptid_t ptid)
 421 {
 422   int fd;
 423   ULONGEST addr;
 424
 425   int tid = ptid.lwp ();
 426   if (tid == 0)
 427     tid = ptid.pid ();
 428
 429   while (!parse_spufs_run (&fd, &addr))
 430     {
 431       ptrace (PT_SYSCALL, tid, (PTRACE_TYPE_ARG3) 0, 0);
 432       waitpid (tid, NULL, __WALL | __WNOTHREAD);
 433     }
 434 }
 435
 436 /* Override the post_attach routine to try load the SPE executable
 437    file image from its copy inside the target process.  */
 438 void
 439 spu_linux_nat_target::post_attach (int pid)
 440 {
 441   int fd;
 442   ULONGEST addr;
 443
 444   /* Like child_post_startup_inferior, if we happened to attach to
 445      the inferior while it wasn't currently in spu_run, continue
 446      running it until we get back there.  */
 447   while (!parse_spufs_run (&fd, &addr))
 448     {
 449       ptrace (PT_SYSCALL, pid, (PTRACE_TYPE_ARG3) 0, 0);
 450       waitpid (pid, NULL, __WALL | __WNOTHREAD);
 451     }
 452
 453   /* If the user has not provided an executable file, try to extract
 454      the image from inside the target process.  */
 455   if (!get_exec_file (0))
 456     spu_symbol_file_add_from_memory (fd);
 457 }
 458
 459 /* Wait for child PTID to do something.  Return id of the child,
 460    minus_one_ptid in case of error; store status into *OURSTATUS.  */
 461 ptid_t
 462 spu_linux_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
 463                             int options)
 464 {
 465   int save_errno;
 466   int status;
 467   pid_t pid;
 468
 469   do
 470     {
 471       set_sigint_trap ();       /* Causes SIGINT to be passed on to the
 472                                    attached process.  */
 473
 474       pid = waitpid (ptid.pid (), &status, 0);
 475       if (pid == -1 && errno == ECHILD)
 476         /* Try again with __WCLONE to check cloned processes.  */
 477         pid = waitpid (ptid.pid (), &status, __WCLONE);
 478
 479       save_errno = errno;
 480
 481       /* Make sure we don't report an event for the exit of the
 482          original program, if we've detached from it.  */
 483       if (pid != -1 && !WIFSTOPPED (status)
 484           && pid != inferior_ptid.pid ())
 485         {
 486           pid = -1;
 487           save_errno = EINTR;
 488         }
 489
 490       clear_sigint_trap ();
 491     }
 492   while (pid == -1 && save_errno == EINTR);
 493
 494   if (pid == -1)
 495     {
 496       warning (_("Child process unexpectedly missing: %s"),
 497                safe_strerror (save_errno));
 498
 499       /* Claim it exited with unknown signal.  */
 500       ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
 501       ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
 502       return inferior_ptid;
 503     }
 504
 505   store_waitstatus (ourstatus, status);
 506   return ptid_t (pid);
 507 }
 508
 509 /* Override the fetch_inferior_register routine.  */
 510 void
 511 spu_linux_nat_target::fetch_registers (struct regcache *regcache, int regno)
 512 {
 513   int fd;
 514   ULONGEST addr;
 515
 516   /* Since we use functions that rely on inferior_ptid, we need to set and
 517      restore it.  */
 518   scoped_restore save_ptid
 519     = make_scoped_restore (&inferior_ptid, regcache->ptid ());
 520
 521   /* We must be stopped on a spu_run system call.  */
 522   if (!parse_spufs_run (&fd, &addr))
 523     return;
 524
 525   /* The ID register holds the spufs file handle.  */
 526   if (regno == -1 || regno == SPU_ID_REGNUM)
 527     {
 528       struct gdbarch *gdbarch = regcache->arch ();
 529       enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 530       gdb_byte buf[4];
 531       store_unsigned_integer (buf, 4, byte_order, fd);
 532       regcache->raw_supply (SPU_ID_REGNUM, buf);
 533     }
 534
 535   /* The NPC register is found at ADDR.  */
 536   if (regno == -1 || regno == SPU_PC_REGNUM)
 537     {
 538       gdb_byte buf[4];
 539       if (fetch_ppc_memory (addr, buf, 4) == 0)
 540         regcache->raw_supply (SPU_PC_REGNUM, buf);
 541     }
 542
 543   /* The GPRs are found in the "regs" spufs file.  */
 544   if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
 545     {
 546       gdb_byte buf[16 * SPU_NUM_GPRS];
 547       char annex[32];
 548       int i;
 549       ULONGEST len;
 550
 551       xsnprintf (annex, sizeof annex, "%d/regs", fd);
 552       if ((spu_proc_xfer_spu (annex, buf, NULL, 0, sizeof buf, &len)
 553            == TARGET_XFER_OK)
 554           && len == sizeof buf)
 555         for (i = 0; i < SPU_NUM_GPRS; i++)
 556           regcache->raw_supply (i, buf + i*16);
 557     }
 558 }
 559
 560 /* Override the store_inferior_register routine.  */
 561 void
 562 spu_linux_nat_target::store_registers (struct regcache *regcache, int regno)
 563 {
 564   int fd;
 565   ULONGEST addr;
 566
 567   /* Since we use functions that rely on inferior_ptid, we need to set and
 568      restore it.  */
 569   scoped_restore save_ptid
 570     = make_scoped_restore (&inferior_ptid, regcache->ptid ());
 571
 572   /* We must be stopped on a spu_run system call.  */
 573   if (!parse_spufs_run (&fd, &addr))
 574     return;
 575
 576   /* The NPC register is found at ADDR.  */
 577   if (regno == -1 || regno == SPU_PC_REGNUM)
 578     {
 579       gdb_byte buf[4];
 580       regcache->raw_collect (SPU_PC_REGNUM, buf);
 581       store_ppc_memory (addr, buf, 4);
 582     }
 583
 584   /* The GPRs are found in the "regs" spufs file.  */
 585   if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS))
 586     {
 587       gdb_byte buf[16 * SPU_NUM_GPRS];
 588       char annex[32];
 589       int i;
 590       ULONGEST len;
 591
 592       for (i = 0; i < SPU_NUM_GPRS; i++)
 593         regcache->raw_collect (i, buf + i*16);
 594
 595       xsnprintf (annex, sizeof annex, "%d/regs", fd);
 596       spu_proc_xfer_spu (annex, NULL, buf, 0, sizeof buf, &len);
 597     }
 598 }
 599
 600 /* Override the to_xfer_partial routine.  */
 601 enum target_xfer_status
 602 spu_linux_nat_target::xfer_partial (enum target_object object, const char *annex,
 603                                     gdb_byte *readbuf, const gdb_byte *writebuf,
 604                                     ULONGEST offset, ULONGEST len,
 605                                     ULONGEST *xfered_len)
 606 {
 607   if (object == TARGET_OBJECT_SPU)
 608     return spu_proc_xfer_spu (annex, readbuf, writebuf, offset, len,
 609                               xfered_len);
 610
 611   if (object == TARGET_OBJECT_MEMORY)
 612     {
 613       int fd;
 614       ULONGEST addr;
 615       char mem_annex[32], lslr_annex[32];
 616       gdb_byte buf[32];
 617       ULONGEST lslr;
 618       enum target_xfer_status ret;
 619
 620       /* We must be stopped on a spu_run system call.  */
 621       if (!parse_spufs_run (&fd, &addr))
 622         return TARGET_XFER_EOF;
 623
 624       /* Use the "mem" spufs file to access SPU local store.  */
 625       xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd);
 626       ret = spu_proc_xfer_spu (mem_annex, readbuf, writebuf, offset, len,
 627                                xfered_len);
 628       if (ret == TARGET_XFER_OK)
 629         return ret;
 630
 631       /* SPU local store access wraps the address around at the
 632          local store limit.  We emulate this here.  To avoid needing
 633          an extra access to retrieve the LSLR, we only do that after
 634          trying the original address first, and getting end-of-file.  */
 635       xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd);
 636       memset (buf, 0, sizeof buf);
 637       if (spu_proc_xfer_spu (lslr_annex, buf, NULL, 0, sizeof buf, xfered_len)
 638           != TARGET_XFER_OK)
 639         return ret;
 640
 641       lslr = strtoulst ((const char *) buf, NULL, 16);
 642       return spu_proc_xfer_spu (mem_annex, readbuf, writebuf,
 643                                 offset & lslr, len, xfered_len);
 644     }
 645
 646   return TARGET_XFER_E_IO;
 647 }
 648
 649 /* Override the to_can_use_hw_breakpoint routine.  */
 650 int
 651 spu_linux_nat_target::can_use_hw_breakpoint (enum bptype type,
 652                                              int cnt, int othertype)
 653 {
 654   return 0;
 655 }
 656
 657 /* Initialize SPU native target.  */
 658 void
 659 _initialize_spu_nat (void)
 660 {
 661   add_inf_child_target (&the_spu_linux_nat_target);
 662 }