gdb/arm-linux-nat.c

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