gdb/arm-linux-nat.c

   1 /* GNU/Linux on ARM native support.
   2    Copyright 1999, 2000, 2001, 2002, 2004, 2005
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "gdbcore.h"
  25 #include "gdb_string.h"
  26 #include "regcache.h"
  27 #include "target.h"
  28 #include "linux-nat.h"
  29
  30 #include "arm-tdep.h"
  31
  32 #include <sys/user.h>
  33 #include <sys/ptrace.h>
  34 #include <sys/utsname.h>
  35 #include <sys/procfs.h>
  36
  37 /* Prototypes for supply_gregset etc. */
  38 #include "gregset.h"
  39
  40 extern int arm_apcs_32;
  41
  42 #define         typeNone                0x00
  43 #define         typeSingle              0x01
  44 #define         typeDouble              0x02
  45 #define         typeExtended            0x03
  46 #define         FPWORDS                 28
  47 #define         ARM_CPSR_REGNUM         16
  48
  49 typedef union tagFPREG
  50   {
  51     unsigned int fSingle;
  52     unsigned int fDouble[2];
  53     unsigned int fExtended[3];
  54   }
  55 FPREG;
  56
  57 typedef struct tagFPA11
  58   {
  59     FPREG fpreg[8];             /* 8 floating point registers */
  60     unsigned int fpsr;          /* floating point status register */
  61     unsigned int fpcr;          /* floating point control register */
  62     unsigned char fType[8];     /* type of floating point value held in
  63                                    floating point registers.  */
  64     int initflag;               /* NWFPE initialization flag.  */
  65   }
  66 FPA11;
  67
  68 /* The following variables are used to determine the version of the
  69    underlying GNU/Linux operating system.  Examples:
  70
  71    GNU/Linux 2.0.35             GNU/Linux 2.2.12
  72    os_version = 0x00020023      os_version = 0x0002020c
  73    os_major = 2                 os_major = 2
  74    os_minor = 0                 os_minor = 2
  75    os_release = 35              os_release = 12
  76
  77    Note: os_version = (os_major << 16) | (os_minor << 8) | os_release
  78
  79    These are initialized using get_linux_version() from
  80    _initialize_arm_linux_nat().  */
  81
  82 static unsigned int os_version, os_major, os_minor, os_release;
  83
  84 /* On GNU/Linux, threads are implemented as pseudo-processes, in which
  85    case we may be tracing more than one process at a time.  In that
  86    case, inferior_ptid will contain the main process ID and the
  87    individual thread (process) ID.  get_thread_id () is used to get
  88    the thread id if it's available, and the process id otherwise.  */
  89
  90 int
  91 get_thread_id (ptid_t ptid)
  92 {
  93   int tid = TIDGET (ptid);
  94   if (0 == tid)
  95     tid = PIDGET (ptid);
  96   return tid;
  97 }
  98 #define GET_THREAD_ID(PTID)     get_thread_id ((PTID));
  99
 100 static void
 101 fetch_nwfpe_single (unsigned int fn, FPA11 * fpa11)
 102 {
 103   unsigned int mem[3];
 104
 105   mem[0] = fpa11->fpreg[fn].fSingle;
 106   mem[1] = 0;
 107   mem[2] = 0;
 108   regcache_raw_supply (current_regcache, ARM_F0_REGNUM + fn, (char *) &mem[0]);
 109 }
 110
 111 static void
 112 fetch_nwfpe_double (unsigned int fn, FPA11 * fpa11)
 113 {
 114   unsigned int mem[3];
 115
 116   mem[0] = fpa11->fpreg[fn].fDouble[1];
 117   mem[1] = fpa11->fpreg[fn].fDouble[0];
 118   mem[2] = 0;
 119   regcache_raw_supply (current_regcache, ARM_F0_REGNUM + fn, (char *) &mem[0]);
 120 }
 121
 122 static void
 123 fetch_nwfpe_none (unsigned int fn)
 124 {
 125   unsigned int mem[3] =
 126   {0, 0, 0};
 127
 128   regcache_raw_supply (current_regcache, ARM_F0_REGNUM + fn, (char *) &mem[0]);
 129 }
 130
 131 static void
 132 fetch_nwfpe_extended (unsigned int fn, FPA11 * fpa11)
 133 {
 134   unsigned int mem[3];
 135
 136   mem[0] = fpa11->fpreg[fn].fExtended[0];       /* sign & exponent */
 137   mem[1] = fpa11->fpreg[fn].fExtended[2];       /* ls bits */
 138   mem[2] = fpa11->fpreg[fn].fExtended[1];       /* ms bits */
 139   regcache_raw_supply (current_regcache, ARM_F0_REGNUM + fn, (char *) &mem[0]);
 140 }
 141
 142 static void
 143 fetch_nwfpe_register (int regno, FPA11 * fpa11)
 144 {
 145    int fn = regno - ARM_F0_REGNUM;
 146
 147    switch (fpa11->fType[fn])
 148      {
 149      case typeSingle:
 150        fetch_nwfpe_single (fn, fpa11);
 151        break;
 152
 153      case typeDouble:
 154        fetch_nwfpe_double (fn, fpa11);
 155        break;
 156
 157      case typeExtended:
 158        fetch_nwfpe_extended (fn, fpa11);
 159        break;
 160
 161      default:
 162        fetch_nwfpe_none (fn);
 163      }
 164 }
 165
 166 static void
 167 store_nwfpe_single (unsigned int fn, FPA11 *fpa11)
 168 {
 169   unsigned int mem[3];
 170
 171   regcache_raw_collect (current_regcache, ARM_F0_REGNUM + fn,
 172                         (char *) &mem[0]);
 173   fpa11->fpreg[fn].fSingle = mem[0];
 174   fpa11->fType[fn] = typeSingle;
 175 }
 176
 177 static void
 178 store_nwfpe_double (unsigned int fn, FPA11 *fpa11)
 179 {
 180   unsigned int mem[3];
 181
 182   regcache_raw_collect (current_regcache, ARM_F0_REGNUM + fn,
 183                         (char *) &mem[0]);
 184   fpa11->fpreg[fn].fDouble[1] = mem[0];
 185   fpa11->fpreg[fn].fDouble[0] = mem[1];
 186   fpa11->fType[fn] = typeDouble;
 187 }
 188
 189 void
 190 store_nwfpe_extended (unsigned int fn, FPA11 *fpa11)
 191 {
 192   unsigned int mem[3];
 193
 194   regcache_raw_collect (current_regcache, ARM_F0_REGNUM + fn,
 195                         (char *) &mem[0]);
 196   fpa11->fpreg[fn].fExtended[0] = mem[0];       /* sign & exponent */
 197   fpa11->fpreg[fn].fExtended[2] = mem[1];       /* ls bits */
 198   fpa11->fpreg[fn].fExtended[1] = mem[2];       /* ms bits */
 199   fpa11->fType[fn] = typeDouble;
 200 }
 201
 202 void
 203 store_nwfpe_register (int regno, FPA11 * fpa11)
 204 {
 205   if (register_cached (regno))
 206     {
 207        unsigned int fn = regno - ARM_F0_REGNUM;
 208        switch (fpa11->fType[fn])
 209          {
 210          case typeSingle:
 211            store_nwfpe_single (fn, fpa11);
 212            break;
 213
 214          case typeDouble:
 215            store_nwfpe_double (fn, fpa11);
 216            break;
 217
 218          case typeExtended:
 219            store_nwfpe_extended (fn, fpa11);
 220            break;
 221          }
 222     }
 223 }
 224
 225
 226 /* Get the value of a particular register from the floating point
 227    state of the process and store it into regcache.  */
 228
 229 static void
 230 fetch_fpregister (int regno)
 231 {
 232   int ret, tid;
 233   FPA11 fp;
 234
 235   /* Get the thread id for the ptrace call.  */
 236   tid = GET_THREAD_ID (inferior_ptid);
 237
 238   /* Read the floating point state.  */
 239   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 240   if (ret < 0)
 241     {
 242       warning (_("Unable to fetch floating point register."));
 243       return;
 244     }
 245
 246   /* Fetch fpsr.  */
 247   if (ARM_FPS_REGNUM == regno)
 248     regcache_raw_supply (current_regcache, ARM_FPS_REGNUM, (char *) &fp.fpsr);
 249
 250   /* Fetch the floating point register.  */
 251   if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
 252     {
 253       int fn = regno - ARM_F0_REGNUM;
 254
 255       switch (fp.fType[fn])
 256         {
 257         case typeSingle:
 258           fetch_nwfpe_single (fn, &fp);
 259           break;
 260
 261         case typeDouble:
 262             fetch_nwfpe_double (fn, &fp);
 263           break;
 264
 265         case typeExtended:
 266             fetch_nwfpe_extended (fn, &fp);
 267           break;
 268
 269         default:
 270             fetch_nwfpe_none (fn);
 271         }
 272     }
 273 }
 274
 275 /* Get the whole floating point state of the process and store it
 276    into regcache.  */
 277
 278 static void
 279 fetch_fpregs (void)
 280 {
 281   int ret, regno, tid;
 282   FPA11 fp;
 283
 284   /* Get the thread id for the ptrace call.  */
 285   tid = GET_THREAD_ID (inferior_ptid);
 286
 287   /* Read the floating point state.  */
 288   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 289   if (ret < 0)
 290     {
 291       warning (_("Unable to fetch the floating point registers."));
 292       return;
 293     }
 294
 295   /* Fetch fpsr.  */
 296   regcache_raw_supply (current_regcache, ARM_FPS_REGNUM, (char *) &fp.fpsr);
 297
 298   /* Fetch the floating point registers.  */
 299   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
 300     {
 301       int fn = regno - ARM_F0_REGNUM;
 302
 303       switch (fp.fType[fn])
 304         {
 305         case typeSingle:
 306           fetch_nwfpe_single (fn, &fp);
 307           break;
 308
 309         case typeDouble:
 310           fetch_nwfpe_double (fn, &fp);
 311           break;
 312
 313         case typeExtended:
 314           fetch_nwfpe_extended (fn, &fp);
 315           break;
 316
 317         default:
 318           fetch_nwfpe_none (fn);
 319         }
 320     }
 321 }
 322
 323 /* Save a particular register into the floating point state of the
 324    process using the contents from regcache.  */
 325
 326 static void
 327 store_fpregister (int regno)
 328 {
 329   int ret, tid;
 330   FPA11 fp;
 331
 332   /* Get the thread id for the ptrace call.  */
 333   tid = GET_THREAD_ID (inferior_ptid);
 334
 335   /* Read the floating point state.  */
 336   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 337   if (ret < 0)
 338     {
 339       warning (_("Unable to fetch the floating point registers."));
 340       return;
 341     }
 342
 343   /* Store fpsr.  */
 344   if (ARM_FPS_REGNUM == regno && register_cached (ARM_FPS_REGNUM))
 345     regcache_raw_collect (current_regcache, ARM_FPS_REGNUM, (char *) &fp.fpsr);
 346
 347   /* Store the floating point register.  */
 348   if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
 349     {
 350       store_nwfpe_register (regno, &fp);
 351     }
 352
 353   ret = ptrace (PTRACE_SETFPREGS, tid, 0, &fp);
 354   if (ret < 0)
 355     {
 356       warning (_("Unable to store floating point register."));
 357       return;
 358     }
 359 }
 360
 361 /* Save the whole floating point state of the process using
 362    the contents from regcache.  */
 363
 364 static void
 365 store_fpregs (void)
 366 {
 367   int ret, regno, tid;
 368   FPA11 fp;
 369
 370   /* Get the thread id for the ptrace call.  */
 371   tid = GET_THREAD_ID (inferior_ptid);
 372
 373   /* Read the floating point state.  */
 374   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 375   if (ret < 0)
 376     {
 377       warning (_("Unable to fetch the floating point registers."));
 378       return;
 379     }
 380
 381   /* Store fpsr.  */
 382   if (register_cached (ARM_FPS_REGNUM))
 383     regcache_raw_collect (current_regcache, ARM_FPS_REGNUM, (char *) &fp.fpsr);
 384
 385   /* Store the floating point registers.  */
 386   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
 387     {
 388       fetch_nwfpe_register (regno, &fp);
 389     }
 390
 391   ret = ptrace (PTRACE_SETFPREGS, tid, 0, &fp);
 392   if (ret < 0)
 393     {
 394       warning (_("Unable to store floating point registers."));
 395       return;
 396     }
 397 }
 398
 399 /* Fetch a general register of the process and store into
 400    regcache.  */
 401
 402 static void
 403 fetch_register (int regno)
 404 {
 405   int ret, tid;
 406   elf_gregset_t regs;
 407
 408   /* Get the thread id for the ptrace call.  */
 409   tid = GET_THREAD_ID (inferior_ptid);
 410
 411   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 412   if (ret < 0)
 413     {
 414       warning (_("Unable to fetch general register."));
 415       return;
 416     }
 417
 418   if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM)
 419     regcache_raw_supply (current_regcache, regno, (char *) &regs[regno]);
 420
 421   if (ARM_PS_REGNUM == regno)
 422     {
 423       if (arm_apcs_32)
 424         regcache_raw_supply (current_regcache, ARM_PS_REGNUM,
 425                              (char *) &regs[ARM_CPSR_REGNUM]);
 426       else
 427         regcache_raw_supply (current_regcache, ARM_PS_REGNUM,
 428                              (char *) &regs[ARM_PC_REGNUM]);
 429     }
 430
 431   if (ARM_PC_REGNUM == regno)
 432     {
 433       regs[ARM_PC_REGNUM] = ADDR_BITS_REMOVE (regs[ARM_PC_REGNUM]);
 434       regcache_raw_supply (current_regcache, ARM_PC_REGNUM,
 435                            (char *) &regs[ARM_PC_REGNUM]);
 436     }
 437 }
 438
 439 /* Fetch all general registers of the process and store into
 440    regcache.  */
 441
 442 static void
 443 fetch_regs (void)
 444 {
 445   int ret, regno, tid;
 446   elf_gregset_t regs;
 447
 448   /* Get the thread id for the ptrace call.  */
 449   tid = GET_THREAD_ID (inferior_ptid);
 450
 451   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 452   if (ret < 0)
 453     {
 454       warning (_("Unable to fetch general registers."));
 455       return;
 456     }
 457
 458   for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
 459     regcache_raw_supply (current_regcache, regno, (char *) &regs[regno]);
 460
 461   if (arm_apcs_32)
 462     regcache_raw_supply (current_regcache, ARM_PS_REGNUM,
 463                          (char *) &regs[ARM_CPSR_REGNUM]);
 464   else
 465     regcache_raw_supply (current_regcache, ARM_PS_REGNUM,
 466                          (char *) &regs[ARM_PC_REGNUM]);
 467
 468   regs[ARM_PC_REGNUM] = ADDR_BITS_REMOVE (regs[ARM_PC_REGNUM]);
 469   regcache_raw_supply (current_regcache, ARM_PC_REGNUM,
 470                        (char *) &regs[ARM_PC_REGNUM]);
 471 }
 472
 473 /* Store all general registers of the process from the values in
 474    regcache.  */
 475
 476 static void
 477 store_register (int regno)
 478 {
 479   int ret, tid;
 480   elf_gregset_t regs;
 481
 482   if (!register_cached (regno))
 483     return;
 484
 485   /* Get the thread id for the ptrace call.  */
 486   tid = GET_THREAD_ID (inferior_ptid);
 487
 488   /* Get the general registers from the process.  */
 489   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 490   if (ret < 0)
 491     {
 492       warning (_("Unable to fetch general registers."));
 493       return;
 494     }
 495
 496   if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM)
 497     regcache_raw_collect (current_regcache, regno, (char *) &regs[regno]);
 498   else if (arm_apcs_32 && regno == ARM_PS_REGNUM)
 499     regcache_raw_collect (current_regcache, regno,
 500                          (char *) &regs[ARM_CPSR_REGNUM]);
 501   else if (!arm_apcs_32 && regno == ARM_PS_REGNUM)
 502     regcache_raw_collect (current_regcache, ARM_PC_REGNUM,
 503                          (char *) &regs[ARM_PC_REGNUM]);
 504
 505   ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);
 506   if (ret < 0)
 507     {
 508       warning (_("Unable to store general register."));
 509       return;
 510     }
 511 }
 512
 513 static void
 514 store_regs (void)
 515 {
 516   int ret, regno, tid;
 517   elf_gregset_t regs;
 518
 519   /* Get the thread id for the ptrace call.  */
 520   tid = GET_THREAD_ID (inferior_ptid);
 521
 522   /* Fetch the general registers.  */
 523   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 524   if (ret < 0)
 525     {
 526       warning (_("Unable to fetch general registers."));
 527       return;
 528     }
 529
 530   for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++)
 531     {
 532       if (register_cached (regno))
 533         regcache_raw_collect (current_regcache, regno, (char *) &regs[regno]);
 534     }
 535
 536   if (arm_apcs_32 && register_cached (ARM_PS_REGNUM))
 537     regcache_raw_collect (current_regcache, ARM_PS_REGNUM,
 538                          (char *) &regs[ARM_CPSR_REGNUM]);
 539
 540   ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);
 541
 542   if (ret < 0)
 543     {
 544       warning (_("Unable to store general registers."));
 545       return;
 546     }
 547 }
 548
 549 /* Fetch registers from the child process.  Fetch all registers if
 550    regno == -1, otherwise fetch all general registers or all floating
 551    point registers depending upon the value of regno.  */
 552
 553 static void
 554 arm_linux_fetch_inferior_registers (int regno)
 555 {
 556   if (-1 == regno)
 557     {
 558       fetch_regs ();
 559       fetch_fpregs ();
 560     }
 561   else
 562     {
 563       if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM)
 564         fetch_register (regno);
 565
 566       if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM)
 567         fetch_fpregister (regno);
 568     }
 569 }
 570
 571 /* Store registers back into the inferior.  Store all registers if
 572    regno == -1, otherwise store all general registers or all floating
 573    point registers depending upon the value of regno.  */
 574
 575 static void
 576 arm_linux_store_inferior_registers (int regno)
 577 {
 578   if (-1 == regno)
 579     {
 580       store_regs ();
 581       store_fpregs ();
 582     }
 583   else
 584     {
 585       if ((regno < ARM_F0_REGNUM) || (regno > ARM_FPS_REGNUM))
 586         store_register (regno);
 587
 588       if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM))
 589         store_fpregister (regno);
 590     }
 591 }
 592
 593 /* Fill register regno (if it is a general-purpose register) in
 594    *gregsetp with the appropriate value from GDB's register array.
 595    If regno is -1, do this for all registers.  */
 596
 597 void
 598 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 599 {
 600   if (-1 == regno)
 601     {
 602       int regnum;
 603       for (regnum = ARM_A1_REGNUM; regnum <= ARM_PC_REGNUM; regnum++)
 604         regcache_raw_collect (current_regcache, regnum,
 605                               (char *) &(*gregsetp)[regnum]);
 606     }
 607   else if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM)
 608     regcache_raw_collect (current_regcache, regno,
 609                           (char *) &(*gregsetp)[regno]);
 610
 611   if (ARM_PS_REGNUM == regno || -1 == regno)
 612     {
 613       if (arm_apcs_32)
 614         regcache_raw_collect (current_regcache, ARM_PS_REGNUM,
 615                               (char *) &(*gregsetp)[ARM_CPSR_REGNUM]);
 616       else
 617         regcache_raw_collect (current_regcache, ARM_PC_REGNUM,
 618                               (char *) &(*gregsetp)[ARM_PC_REGNUM]);
 619     }
 620 }
 621
 622 /* Fill GDB's register array with the general-purpose register values
 623    in *gregsetp.  */
 624
 625 void
 626 supply_gregset (gdb_gregset_t *gregsetp)
 627 {
 628   int regno, reg_pc;
 629
 630   for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
 631     regcache_raw_supply (current_regcache, regno,
 632                          (char *) &(*gregsetp)[regno]);
 633
 634   if (arm_apcs_32)
 635     regcache_raw_supply (current_regcache, ARM_PS_REGNUM,
 636                          (char *) &(*gregsetp)[ARM_CPSR_REGNUM]);
 637   else
 638     regcache_raw_supply (current_regcache, ARM_PS_REGNUM,
 639                          (char *) &(*gregsetp)[ARM_PC_REGNUM]);
 640
 641   reg_pc = ADDR_BITS_REMOVE ((CORE_ADDR)(*gregsetp)[ARM_PC_REGNUM]);
 642   regcache_raw_supply (current_regcache, ARM_PC_REGNUM, (char *) &reg_pc);
 643 }
 644
 645 /* Fill register regno (if it is a floating-point register) in
 646    *fpregsetp with the appropriate value from GDB's register array.
 647    If regno is -1, do this for all registers.  */
 648
 649 void
 650 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 651 {
 652   FPA11 *fp = (FPA11 *) fpregsetp;
 653
 654   if (-1 == regno)
 655     {
 656        int regnum;
 657        for (regnum = ARM_F0_REGNUM; regnum <= ARM_F7_REGNUM; regnum++)
 658          store_nwfpe_register (regnum, fp);
 659     }
 660   else if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
 661     {
 662       store_nwfpe_register (regno, fp);
 663       return;
 664     }
 665
 666   /* Store fpsr.  */
 667   if (ARM_FPS_REGNUM == regno || -1 == regno)
 668     regcache_raw_collect (current_regcache, ARM_FPS_REGNUM,
 669                           (char *) &fp->fpsr);
 670 }
 671
 672 /* Fill GDB's register array with the floating-point register values
 673    in *fpregsetp.  */
 674
 675 void
 676 supply_fpregset (gdb_fpregset_t *fpregsetp)
 677 {
 678   int regno;
 679   FPA11 *fp = (FPA11 *) fpregsetp;
 680
 681   /* Fetch fpsr.  */
 682   regcache_raw_supply (current_regcache, ARM_FPS_REGNUM, (char *) &fp->fpsr);
 683
 684   /* Fetch the floating point registers.  */
 685   for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
 686     {
 687       fetch_nwfpe_register (regno, fp);
 688     }
 689 }
 690
 691 int
 692 arm_linux_kernel_u_size (void)
 693 {
 694   return (sizeof (struct user));
 695 }
 696
 697 static unsigned int
 698 get_linux_version (unsigned int *vmajor,
 699                    unsigned int *vminor,
 700                    unsigned int *vrelease)
 701 {
 702   struct utsname info;
 703   char *pmajor, *pminor, *prelease, *tail;
 704
 705   if (-1 == uname (&info))
 706     {
 707       warning (_("Unable to determine GNU/Linux version."));
 708       return -1;
 709     }
 710
 711   pmajor = strtok (info.release, ".");
 712   pminor = strtok (NULL, ".");
 713   prelease = strtok (NULL, ".");
 714
 715   *vmajor = (unsigned int) strtoul (pmajor, &tail, 0);
 716   *vminor = (unsigned int) strtoul (pminor, &tail, 0);
 717   *vrelease = (unsigned int) strtoul (prelease, &tail, 0);
 718
 719   return ((*vmajor << 16) | (*vminor << 8) | *vrelease);
 720 }
 721
 722 void _initialize_arm_linux_nat (void);
 723
 724 void
 725 _initialize_arm_linux_nat (void)
 726 {
 727   struct target_ops *t;
 728
 729   os_version = get_linux_version (&os_major, &os_minor, &os_release);
 730
 731   /* Fill in the generic GNU/Linux methods.  */
 732   t = linux_target ();
 733
 734   /* Add our register access methods.  */
 735   t->to_fetch_registers = arm_linux_fetch_inferior_registers;
 736   t->to_store_registers = arm_linux_store_inferior_registers;
 737
 738   /* Register the target.  */
 739   add_target (t);
 740 }