gdb/arm-linux-nat.c

   1 /* GNU/Linux on ARM native support.
   2    Copyright 1999, 2000, 2001 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 <sys/user.h>
  28 #include <sys/ptrace.h>
  29 #include <sys/utsname.h>
  30 #include <sys/procfs.h>
  31
  32 /* Prototypes for supply_gregset etc. */
  33 #include "gregset.h"
  34
  35 extern int arm_apcs_32;
  36
  37 #define         typeNone                0x00
  38 #define         typeSingle              0x01
  39 #define         typeDouble              0x02
  40 #define         typeExtended            0x03
  41 #define         FPWORDS                 28
  42 #define         CPSR_REGNUM             16
  43
  44 typedef union tagFPREG
  45   {
  46     unsigned int fSingle;
  47     unsigned int fDouble[2];
  48     unsigned int fExtended[3];
  49   }
  50 FPREG;
  51
  52 typedef struct tagFPA11
  53   {
  54     FPREG fpreg[8];             /* 8 floating point registers */
  55     unsigned int fpsr;          /* floating point status register */
  56     unsigned int fpcr;          /* floating point control register */
  57     unsigned char fType[8];     /* type of floating point value held in
  58                                    floating point registers.  */
  59     int initflag;               /* NWFPE initialization flag.  */
  60   }
  61 FPA11;
  62
  63 /* The following variables are used to determine the version of the
  64    underlying Linux operating system.  Examples:
  65
  66    Linux 2.0.35                 Linux 2.2.12
  67    os_version = 0x00020023      os_version = 0x0002020c
  68    os_major = 2                 os_major = 2
  69    os_minor = 0                 os_minor = 2
  70    os_release = 35              os_release = 12
  71
  72    Note: os_version = (os_major << 16) | (os_minor << 8) | os_release
  73
  74    These are initialized using get_linux_version() from
  75    _initialize_arm_linux_nat().  */
  76
  77 static unsigned int os_version, os_major, os_minor, os_release;
  78
  79 /* On Linux, threads are implemented as pseudo-processes, in which
  80    case we may be tracing more than one process at a time.  In that
  81    case, inferior_ptid will contain the main process ID and the
  82    individual thread (process) ID.  get_thread_id () is used to
  83    get the thread id if it's available, and the process id otherwise. */
  84
  85 int
  86 get_thread_id (ptid_t ptid)
  87 {
  88   int tid = TIDGET (ptid);
  89   if (0 == tid)
  90     tid = PIDGET (ptid);
  91   return tid;
  92 }
  93 #define GET_THREAD_ID(PTID)     get_thread_id ((PTID));
  94
  95 static void
  96 fetch_nwfpe_single (unsigned int fn, FPA11 * fpa11)
  97 {
  98   unsigned int mem[3];
  99
 100   mem[0] = fpa11->fpreg[fn].fSingle;
 101   mem[1] = 0;
 102   mem[2] = 0;
 103   supply_register (F0_REGNUM + fn, (char *) &mem[0]);
 104 }
 105
 106 static void
 107 fetch_nwfpe_double (unsigned int fn, FPA11 * fpa11)
 108 {
 109   unsigned int mem[3];
 110
 111   mem[0] = fpa11->fpreg[fn].fDouble[1];
 112   mem[1] = fpa11->fpreg[fn].fDouble[0];
 113   mem[2] = 0;
 114   supply_register (F0_REGNUM + fn, (char *) &mem[0]);
 115 }
 116
 117 static void
 118 fetch_nwfpe_none (unsigned int fn)
 119 {
 120   unsigned int mem[3] =
 121   {0, 0, 0};
 122
 123   supply_register (F0_REGNUM + fn, (char *) &mem[0]);
 124 }
 125
 126 static void
 127 fetch_nwfpe_extended (unsigned int fn, FPA11 * fpa11)
 128 {
 129   unsigned int mem[3];
 130
 131   mem[0] = fpa11->fpreg[fn].fExtended[0];       /* sign & exponent */
 132   mem[1] = fpa11->fpreg[fn].fExtended[2];       /* ls bits */
 133   mem[2] = fpa11->fpreg[fn].fExtended[1];       /* ms bits */
 134   supply_register (F0_REGNUM + fn, (char *) &mem[0]);
 135 }
 136
 137 static void
 138 fetch_nwfpe_register (int regno, FPA11 * fpa11)
 139 {
 140    int fn = regno - F0_REGNUM;
 141
 142    switch (fpa11->fType[fn])
 143      {
 144      case typeSingle:
 145        fetch_nwfpe_single (fn, fpa11);
 146        break;
 147
 148      case typeDouble:
 149        fetch_nwfpe_double (fn, fpa11);
 150        break;
 151
 152      case typeExtended:
 153        fetch_nwfpe_extended (fn, fpa11);
 154        break;
 155
 156      default:
 157        fetch_nwfpe_none (fn);
 158      }
 159 }
 160
 161 static void
 162 store_nwfpe_single (unsigned int fn, FPA11 * fpa11)
 163 {
 164   unsigned int mem[3];
 165
 166   read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
 167   fpa11->fpreg[fn].fSingle = mem[0];
 168   fpa11->fType[fn] = typeSingle;
 169 }
 170
 171 static void
 172 store_nwfpe_double (unsigned int fn, FPA11 * fpa11)
 173 {
 174   unsigned int mem[3];
 175
 176   read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
 177   fpa11->fpreg[fn].fDouble[1] = mem[0];
 178   fpa11->fpreg[fn].fDouble[0] = mem[1];
 179   fpa11->fType[fn] = typeDouble;
 180 }
 181
 182 void
 183 store_nwfpe_extended (unsigned int fn, FPA11 * fpa11)
 184 {
 185   unsigned int mem[3];
 186
 187   read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
 188   fpa11->fpreg[fn].fExtended[0] = mem[0];       /* sign & exponent */
 189   fpa11->fpreg[fn].fExtended[2] = mem[1];       /* ls bits */
 190   fpa11->fpreg[fn].fExtended[1] = mem[2];       /* ms bits */
 191   fpa11->fType[fn] = typeDouble;
 192 }
 193
 194 void
 195 store_nwfpe_register (int regno, FPA11 * fpa11)
 196 {
 197   if (register_valid[regno])
 198     {
 199        unsigned int fn = regno - F0_REGNUM;
 200        switch (fpa11->fType[fn])
 201          {
 202          case typeSingle:
 203            store_nwfpe_single (fn, fpa11);
 204            break;
 205
 206          case typeDouble:
 207            store_nwfpe_double (fn, fpa11);
 208            break;
 209
 210          case typeExtended:
 211            store_nwfpe_extended (fn, fpa11);
 212            break;
 213          }
 214     }
 215 }
 216
 217
 218 /* Get the value of a particular register from the floating point
 219    state of the process and store it into registers[].  */
 220
 221 static void
 222 fetch_fpregister (int regno)
 223 {
 224   int ret, tid;
 225   FPA11 fp;
 226
 227   /* Get the thread id for the ptrace call.  */
 228   tid = GET_THREAD_ID (inferior_ptid);
 229
 230   /* Read the floating point state.  */
 231   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 232   if (ret < 0)
 233     {
 234       warning ("Unable to fetch floating point register.");
 235       return;
 236     }
 237
 238   /* Fetch fpsr.  */
 239   if (FPS_REGNUM == regno)
 240     supply_register (FPS_REGNUM, (char *) &fp.fpsr);
 241
 242   /* Fetch the floating point register.  */
 243   if (regno >= F0_REGNUM && regno <= F7_REGNUM)
 244     {
 245       int fn = regno - F0_REGNUM;
 246
 247       switch (fp.fType[fn])
 248         {
 249         case typeSingle:
 250           fetch_nwfpe_single (fn, &fp);
 251           break;
 252
 253         case typeDouble:
 254             fetch_nwfpe_double (fn, &fp);
 255           break;
 256
 257         case typeExtended:
 258             fetch_nwfpe_extended (fn, &fp);
 259           break;
 260
 261         default:
 262             fetch_nwfpe_none (fn);
 263         }
 264     }
 265 }
 266
 267 /* Get the whole floating point state of the process and store it
 268    into registers[].  */
 269
 270 static void
 271 fetch_fpregs (void)
 272 {
 273   int ret, regno, tid;
 274   FPA11 fp;
 275
 276   /* Get the thread id for the ptrace call.  */
 277   tid = GET_THREAD_ID (inferior_ptid);
 278
 279   /* Read the floating point state.  */
 280   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 281   if (ret < 0)
 282     {
 283       warning ("Unable to fetch the floating point registers.");
 284       return;
 285     }
 286
 287   /* Fetch fpsr.  */
 288   supply_register (FPS_REGNUM, (char *) &fp.fpsr);
 289
 290   /* Fetch the floating point registers.  */
 291   for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
 292     {
 293       int fn = regno - F0_REGNUM;
 294
 295       switch (fp.fType[fn])
 296         {
 297         case typeSingle:
 298           fetch_nwfpe_single (fn, &fp);
 299           break;
 300
 301         case typeDouble:
 302           fetch_nwfpe_double (fn, &fp);
 303           break;
 304
 305         case typeExtended:
 306           fetch_nwfpe_extended (fn, &fp);
 307           break;
 308
 309         default:
 310           fetch_nwfpe_none (fn);
 311         }
 312     }
 313 }
 314
 315 /* Save a particular register into the floating point state of the
 316    process using the contents from registers[].  */
 317
 318 static void
 319 store_fpregister (int regno)
 320 {
 321   int ret, tid;
 322   FPA11 fp;
 323
 324   /* Get the thread id for the ptrace call.  */
 325   tid = GET_THREAD_ID (inferior_ptid);
 326
 327   /* Read the floating point state.  */
 328   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 329   if (ret < 0)
 330     {
 331       warning ("Unable to fetch the floating point registers.");
 332       return;
 333     }
 334
 335   /* Store fpsr.  */
 336   if (FPS_REGNUM == regno && register_valid[FPS_REGNUM])
 337     read_register_gen (FPS_REGNUM, (char *) &fp.fpsr);
 338
 339   /* Store the floating point register.  */
 340   if (regno >= F0_REGNUM && regno <= F7_REGNUM)
 341     {
 342       store_nwfpe_register (regno, &fp);
 343     }
 344
 345   ret = ptrace (PTRACE_SETFPREGS, tid, 0, &fp);
 346   if (ret < 0)
 347     {
 348       warning ("Unable to store floating point register.");
 349       return;
 350     }
 351 }
 352
 353 /* Save the whole floating point state of the process using
 354    the contents from registers[].  */
 355
 356 static void
 357 store_fpregs (void)
 358 {
 359   int ret, regno, tid;
 360   FPA11 fp;
 361
 362   /* Get the thread id for the ptrace call.  */
 363   tid = GET_THREAD_ID (inferior_ptid);
 364
 365   /* Read the floating point state.  */
 366   ret = ptrace (PT_GETFPREGS, tid, 0, &fp);
 367   if (ret < 0)
 368     {
 369       warning ("Unable to fetch the floating point registers.");
 370       return;
 371     }
 372
 373   /* Store fpsr.  */
 374   if (register_valid[FPS_REGNUM])
 375     read_register_gen (FPS_REGNUM, (char *) &fp.fpsr);
 376
 377   /* Store the floating point registers.  */
 378   for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
 379     {
 380       fetch_nwfpe_register (regno, &fp);
 381     }
 382
 383   ret = ptrace (PTRACE_SETFPREGS, tid, 0, &fp);
 384   if (ret < 0)
 385     {
 386       warning ("Unable to store floating point registers.");
 387       return;
 388     }
 389 }
 390
 391 /* Fetch a general register of the process and store into
 392    registers[].  */
 393
 394 static void
 395 fetch_register (int regno)
 396 {
 397   int ret, tid;
 398   struct pt_regs regs;
 399
 400   /* Get the thread id for the ptrace call.  */
 401   tid = GET_THREAD_ID (inferior_ptid);
 402
 403   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 404   if (ret < 0)
 405     {
 406       warning ("Unable to fetch general register.");
 407       return;
 408     }
 409
 410   if (regno >= A1_REGNUM && regno < PC_REGNUM)
 411     supply_register (regno, (char *) &regs.uregs[regno]);
 412
 413   if (PS_REGNUM == regno)
 414     {
 415       if (arm_apcs_32)
 416         supply_register (PS_REGNUM, (char *) &regs.uregs[CPSR_REGNUM]);
 417       else
 418         supply_register (PS_REGNUM, (char *) &regs.uregs[PC_REGNUM]);
 419     }
 420
 421   if (PC_REGNUM == regno)
 422     {
 423       regs.uregs[PC_REGNUM] = ADDR_BITS_REMOVE (regs.uregs[PC_REGNUM]);
 424       supply_register (PC_REGNUM, (char *) &regs.uregs[PC_REGNUM]);
 425     }
 426 }
 427
 428 /* Fetch all general registers of the process and store into
 429    registers[].  */
 430
 431 static void
 432 fetch_regs (void)
 433 {
 434   int ret, regno, tid;
 435   struct pt_regs regs;
 436
 437   /* Get the thread id for the ptrace call.  */
 438   tid = GET_THREAD_ID (inferior_ptid);
 439
 440   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 441   if (ret < 0)
 442     {
 443       warning ("Unable to fetch general registers.");
 444       return;
 445     }
 446
 447   for (regno = A1_REGNUM; regno < PC_REGNUM; regno++)
 448     supply_register (regno, (char *) &regs.uregs[regno]);
 449
 450   if (arm_apcs_32)
 451     supply_register (PS_REGNUM, (char *) &regs.uregs[CPSR_REGNUM]);
 452   else
 453     supply_register (PS_REGNUM, (char *) &regs.uregs[PC_REGNUM]);
 454
 455   regs.uregs[PC_REGNUM] = ADDR_BITS_REMOVE (regs.uregs[PC_REGNUM]);
 456   supply_register (PC_REGNUM, (char *) &regs.uregs[PC_REGNUM]);
 457 }
 458
 459 /* Store all general registers of the process from the values in
 460    registers[].  */
 461
 462 static void
 463 store_register (int regno)
 464 {
 465   int ret, tid;
 466   struct pt_regs regs;
 467
 468   if (!register_valid[regno])
 469     return;
 470
 471   /* Get the thread id for the ptrace call.  */
 472   tid = GET_THREAD_ID (inferior_ptid);
 473
 474   /* Get the general registers from the process.  */
 475   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 476   if (ret < 0)
 477     {
 478       warning ("Unable to fetch general registers.");
 479       return;
 480     }
 481
 482   if (regno >= A1_REGNUM && regno <= PC_REGNUM)
 483     read_register_gen (regno, (char *) &regs.uregs[regno]);
 484
 485   ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);
 486   if (ret < 0)
 487     {
 488       warning ("Unable to store general register.");
 489       return;
 490     }
 491 }
 492
 493 static void
 494 store_regs (void)
 495 {
 496   int ret, regno, tid;
 497   struct pt_regs regs;
 498
 499   /* Get the thread id for the ptrace call.  */
 500   tid = GET_THREAD_ID (inferior_ptid);
 501
 502   /* Fetch the general registers.  */
 503   ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);
 504   if (ret < 0)
 505     {
 506       warning ("Unable to fetch general registers.");
 507       return;
 508     }
 509
 510   for (regno = A1_REGNUM; regno <= PC_REGNUM; regno++)
 511     {
 512       if (register_valid[regno])
 513         read_register_gen (regno, (char *) &regs.uregs[regno]);
 514     }
 515
 516   ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);
 517
 518   if (ret < 0)
 519     {
 520       warning ("Unable to store general registers.");
 521       return;
 522     }
 523 }
 524
 525 /* Fetch registers from the child process.  Fetch all registers if
 526    regno == -1, otherwise fetch all general registers or all floating
 527    point registers depending upon the value of regno.  */
 528
 529 void
 530 fetch_inferior_registers (int regno)
 531 {
 532   if (-1 == regno)
 533     {
 534       fetch_regs ();
 535       fetch_fpregs ();
 536     }
 537   else
 538     {
 539       if (regno < F0_REGNUM || regno > FPS_REGNUM)
 540         fetch_register (regno);
 541
 542       if (regno >= F0_REGNUM && regno <= FPS_REGNUM)
 543         fetch_fpregister (regno);
 544     }
 545 }
 546
 547 /* Store registers back into the inferior.  Store all registers if
 548    regno == -1, otherwise store all general registers or all floating
 549    point registers depending upon the value of regno.  */
 550
 551 void
 552 store_inferior_registers (int regno)
 553 {
 554   if (-1 == regno)
 555     {
 556       store_regs ();
 557       store_fpregs ();
 558     }
 559   else
 560     {
 561       if ((regno < F0_REGNUM) || (regno > FPS_REGNUM))
 562         store_register (regno);
 563
 564       if ((regno >= F0_REGNUM) && (regno <= FPS_REGNUM))
 565         store_fpregister (regno);
 566     }
 567 }
 568
 569 /* Fill register regno (if it is a general-purpose register) in
 570    *gregsetp with the appropriate value from GDB's register array.
 571    If regno is -1, do this for all registers.  */
 572
 573 void
 574 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 575 {
 576   if (-1 == regno)
 577     {
 578       int regnum;
 579       for (regnum = A1_REGNUM; regnum <= PC_REGNUM; regnum++)
 580         if (register_valid[regnum])
 581           read_register_gen (regnum, (char *) &(*gregsetp)[regnum]);
 582     }
 583   else if (regno >= A1_REGNUM && regno <= PC_REGNUM)
 584     {
 585       if (register_valid[regno])
 586         read_register_gen (regno, (char *) &(*gregsetp)[regno]);
 587     }
 588
 589   if (PS_REGNUM == regno || -1 == regno)
 590     {
 591       if (register_valid[regno] || -1 == regno)
 592         {
 593           if (arm_apcs_32)
 594             read_register_gen (PS_REGNUM, (char *) &(*gregsetp)[CPSR_REGNUM]);
 595           else
 596             read_register_gen (PC_REGNUM, (char *) &(*gregsetp)[PC_REGNUM]);
 597         }
 598     }
 599
 600 }
 601
 602 /* Fill GDB's register array with the general-purpose register values
 603    in *gregsetp.  */
 604
 605 void
 606 supply_gregset (gdb_gregset_t *gregsetp)
 607 {
 608   int regno, reg_pc;
 609
 610   for (regno = A1_REGNUM; regno < PC_REGNUM; regno++)
 611     supply_register (regno, (char *) &(*gregsetp)[regno]);
 612
 613   if (arm_apcs_32)
 614     supply_register (PS_REGNUM, (char *) &(*gregsetp)[CPSR_REGNUM]);
 615   else
 616     supply_register (PS_REGNUM, (char *) &(*gregsetp)[PC_REGNUM]);
 617
 618   reg_pc = ADDR_BITS_REMOVE ((CORE_ADDR)(*gregsetp)[PC_REGNUM]);
 619   supply_register (PC_REGNUM, (char *) &reg_pc);
 620 }
 621
 622 /* Fill register regno (if it is a floating-point register) in
 623    *fpregsetp with the appropriate value from GDB's register array.
 624    If regno is -1, do this for all registers.  */
 625
 626 void
 627 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 628 {
 629   FPA11 *fp = (FPA11 *) fpregsetp;
 630
 631   if (-1 == regno)
 632     {
 633        int regnum;
 634        for (regnum = F0_REGNUM; regnum <= F7_REGNUM; regnum++)
 635          store_nwfpe_register (regnum, fp);
 636     }
 637   else if (regno >= F0_REGNUM && regno <= F7_REGNUM)
 638     {
 639       store_nwfpe_register (regno, fp);
 640       return;
 641     }
 642
 643   /* Store fpsr.  */
 644   if (register_valid[FPS_REGNUM])
 645     if (FPS_REGNUM == regno || -1 == regno)
 646       read_register_gen (FPS_REGNUM, (char *) &fp->fpsr);
 647 }
 648
 649 /* Fill GDB's register array with the floating-point register values
 650    in *fpregsetp.  */
 651
 652 void
 653 supply_fpregset (gdb_fpregset_t *fpregsetp)
 654 {
 655   int regno;
 656   FPA11 *fp = (FPA11 *) fpregsetp;
 657
 658   /* Fetch fpsr.  */
 659   supply_register (FPS_REGNUM, (char *) &fp->fpsr);
 660
 661   /* Fetch the floating point registers.  */
 662   for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
 663     {
 664       fetch_nwfpe_register (regno, fp);
 665     }
 666 }
 667
 668 int
 669 arm_linux_kernel_u_size (void)
 670 {
 671   return (sizeof (struct user));
 672 }
 673
 674 static unsigned int
 675 get_linux_version (unsigned int *vmajor,
 676                    unsigned int *vminor,
 677                    unsigned int *vrelease)
 678 {
 679   struct utsname info;
 680   char *pmajor, *pminor, *prelease, *tail;
 681
 682   if (-1 == uname (&info))
 683     {
 684       warning ("Unable to determine Linux version.");
 685       return -1;
 686     }
 687
 688   pmajor = strtok (info.release, ".");
 689   pminor = strtok (NULL, ".");
 690   prelease = strtok (NULL, ".");
 691
 692   *vmajor = (unsigned int) strtoul (pmajor, &tail, 0);
 693   *vminor = (unsigned int) strtoul (pminor, &tail, 0);
 694   *vrelease = (unsigned int) strtoul (prelease, &tail, 0);
 695
 696   return ((*vmajor << 16) | (*vminor << 8) | *vrelease);
 697 }
 698
 699 void
 700 _initialize_arm_linux_nat (void)
 701 {
 702   os_version = get_linux_version (&os_major, &os_minor, &os_release);
 703 }