arch/sparc/kernel/ptrace.c

   1 /* ptrace.c: Sparc process tracing support.
   2  *
   3  * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
   4  *
   5  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
   6  * and David Mosberger.
   7  *
   8  * Added Linux support -miguel (weird, eh?, the original code was meant
   9  * to emulate SunOS).
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <linux/errno.h>
  16 #include <linux/ptrace.h>
  17 #include <linux/user.h>
  18 #include <linux/smp.h>
  19 #include <linux/smp_lock.h>
  20 #include <linux/security.h>
  21 #include <linux/signal.h>
  22 #include <linux/regset.h>
  23 #include <linux/elf.h>
  24 #include <linux/tracehook.h>
  25
  26 #include <asm/pgtable.h>
  27 #include <asm/system.h>
  28 #include <asm/uaccess.h>
  29
  30 /* #define ALLOW_INIT_TRACING */
  31
  32 /*
  33  * Called by kernel/ptrace.c when detaching..
  34  *
  35  * Make sure single step bits etc are not set.
  36  */
  37 void ptrace_disable(struct task_struct *child)
  38 {
  39         /* nothing to do */
  40 }
  41
  42 enum sparc_regset {
  43         REGSET_GENERAL,
  44         REGSET_FP,
  45 };
  46
  47 static int genregs32_get(struct task_struct *target,
  48                          const struct user_regset *regset,
  49                          unsigned int pos, unsigned int count,
  50                          void *kbuf, void __user *ubuf)
  51 {
  52         const struct pt_regs *regs = target->thread.kregs;
  53         unsigned long __user *reg_window;
  54         unsigned long *k = kbuf;
  55         unsigned long __user *u = ubuf;
  56         unsigned long reg;
  57
  58         if (target == current)
  59                 flush_user_windows();
  60
  61         pos /= sizeof(reg);
  62         count /= sizeof(reg);
  63
  64         if (kbuf) {
  65                 for (; count > 0 && pos < 16; count--)
  66                         *k++ = regs->u_regs[pos++];
  67
  68                 reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
  69                 for (; count > 0 && pos < 32; count--) {
  70                         if (get_user(*k++, &reg_window[pos++]))
  71                                 return -EFAULT;
  72                 }
  73         } else {
  74                 for (; count > 0 && pos < 16; count--) {
  75                         if (put_user(regs->u_regs[pos++], u++))
  76                                 return -EFAULT;
  77                 }
  78
  79                 reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
  80                 for (; count > 0 && pos < 32; count--) {
  81                         if (get_user(reg, &reg_window[pos++]) ||
  82                             put_user(reg, u++))
  83                                 return -EFAULT;
  84                 }
  85         }
  86         while (count > 0) {
  87                 switch (pos) {
  88                 case 32: /* PSR */
  89                         reg = regs->psr;
  90                         break;
  91                 case 33: /* PC */
  92                         reg = regs->pc;
  93                         break;
  94                 case 34: /* NPC */
  95                         reg = regs->npc;
  96                         break;
  97                 case 35: /* Y */
  98                         reg = regs->y;
  99                         break;
 100                 case 36: /* WIM */
 101                 case 37: /* TBR */
 102                         reg = 0;
 103                         break;
 104                 default:
 105                         goto finish;
 106                 }
 107
 108                 if (kbuf)
 109                         *k++ = reg;
 110                 else if (put_user(reg, u++))
 111                         return -EFAULT;
 112                 pos++;
 113                 count--;
 114         }
 115 finish:
 116         pos *= sizeof(reg);
 117         count *= sizeof(reg);
 118
 119         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 120                                         38 * sizeof(reg), -1);
 121 }
 122
 123 static int genregs32_set(struct task_struct *target,
 124                          const struct user_regset *regset,
 125                          unsigned int pos, unsigned int count,
 126                          const void *kbuf, const void __user *ubuf)
 127 {
 128         struct pt_regs *regs = target->thread.kregs;
 129         unsigned long __user *reg_window;
 130         const unsigned long *k = kbuf;
 131         const unsigned long __user *u = ubuf;
 132         unsigned long reg;
 133
 134         if (target == current)
 135                 flush_user_windows();
 136
 137         pos /= sizeof(reg);
 138         count /= sizeof(reg);
 139
 140         if (kbuf) {
 141                 for (; count > 0 && pos < 16; count--)
 142                         regs->u_regs[pos++] = *k++;
 143
 144                 reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 145                 for (; count > 0 && pos < 32; count--) {
 146                         if (put_user(*k++, &reg_window[pos++]))
 147                                 return -EFAULT;
 148                 }
 149         } else {
 150                 for (; count > 0 && pos < 16; count--) {
 151                         if (get_user(reg, u++))
 152                                 return -EFAULT;
 153                         regs->u_regs[pos++] = reg;
 154                 }
 155
 156                 reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 157                 for (; count > 0 && pos < 32; count--) {
 158                         if (get_user(reg, u++) ||
 159                             put_user(reg, &reg_window[pos++]))
 160                                 return -EFAULT;
 161                 }
 162         }
 163         while (count > 0) {
 164                 unsigned long psr;
 165
 166                 if (kbuf)
 167                         reg = *k++;
 168                 else if (get_user(reg, u++))
 169                         return -EFAULT;
 170
 171                 switch (pos) {
 172                 case 32: /* PSR */
 173                         psr = regs->psr;
 174                         psr &= ~(PSR_ICC | PSR_SYSCALL);
 175                         psr |= (reg & (PSR_ICC | PSR_SYSCALL));
 176                         regs->psr = psr;
 177                         break;
 178                 case 33: /* PC */
 179                         regs->pc = reg;
 180                         break;
 181                 case 34: /* NPC */
 182                         regs->npc = reg;
 183                         break;
 184                 case 35: /* Y */
 185                         regs->y = reg;
 186                         break;
 187                 case 36: /* WIM */
 188                 case 37: /* TBR */
 189                         break;
 190                 default:
 191                         goto finish;
 192                 }
 193
 194                 pos++;
 195                 count--;
 196         }
 197 finish:
 198         pos *= sizeof(reg);
 199         count *= sizeof(reg);
 200
 201         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 202                                          38 * sizeof(reg), -1);
 203 }
 204
 205 static int fpregs32_get(struct task_struct *target,
 206                         const struct user_regset *regset,
 207                         unsigned int pos, unsigned int count,
 208                         void *kbuf, void __user *ubuf)
 209 {
 210         const unsigned long *fpregs = target->thread.float_regs;
 211         int ret = 0;
 212
 213 #if 0
 214         if (target == current)
 215                 save_and_clear_fpu();
 216 #endif
 217
 218         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 219                                   fpregs,
 220                                   0, 32 * sizeof(u32));
 221
 222         if (!ret)
 223                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 224                                                32 * sizeof(u32),
 225                                                33 * sizeof(u32));
 226         if (!ret)
 227                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 228                                           &target->thread.fsr,
 229                                           33 * sizeof(u32),
 230                                           34 * sizeof(u32));
 231
 232         if (!ret) {
 233                 unsigned long val;
 234
 235                 val = (1 << 8) | (8 << 16);
 236                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 237                                           &val,
 238                                           34 * sizeof(u32),
 239                                           35 * sizeof(u32));
 240         }
 241
 242         if (!ret)
 243                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 244                                                35 * sizeof(u32), -1);
 245
 246         return ret;
 247 }
 248
 249 static int fpregs32_set(struct task_struct *target,
 250                         const struct user_regset *regset,
 251                         unsigned int pos, unsigned int count,
 252                         const void *kbuf, const void __user *ubuf)
 253 {
 254         unsigned long *fpregs = target->thread.float_regs;
 255         int ret;
 256
 257 #if 0
 258         if (target == current)
 259                 save_and_clear_fpu();
 260 #endif
 261         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 262                                  fpregs,
 263                                  0, 32 * sizeof(u32));
 264         if (!ret)
 265                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 266                                           32 * sizeof(u32),
 267                                           33 * sizeof(u32));
 268         if (!ret && count > 0) {
 269                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 270                                          &target->thread.fsr,
 271                                          33 * sizeof(u32),
 272                                          34 * sizeof(u32));
 273         }
 274
 275         if (!ret)
 276                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 277                                                 34 * sizeof(u32), -1);
 278         return ret;
 279 }
 280
 281 static const struct user_regset sparc32_regsets[] = {
 282         /* Format is:
 283          *      G0 --> G7
 284          *      O0 --> O7
 285          *      L0 --> L7
 286          *      I0 --> I7
 287          *      PSR, PC, nPC, Y, WIM, TBR
 288          */
 289         [REGSET_GENERAL] = {
 290                 .core_note_type = NT_PRSTATUS,
 291                 .n = 38 * sizeof(u32),
 292                 .size = sizeof(u32), .align = sizeof(u32),
 293                 .get = genregs32_get, .set = genregs32_set
 294         },
 295         /* Format is:
 296          *      F0 --> F31
 297          *      empty 32-bit word
 298          *      FSR (32--bit word)
 299          *      FPU QUEUE COUNT (8-bit char)
 300          *      FPU QUEUE ENTRYSIZE (8-bit char)
 301          *      FPU ENABLED (8-bit char)
 302          *      empty 8-bit char
 303          *      FPU QUEUE (64 32-bit ints)
 304          */
 305         [REGSET_FP] = {
 306                 .core_note_type = NT_PRFPREG,
 307                 .n = 99 * sizeof(u32),
 308                 .size = sizeof(u32), .align = sizeof(u32),
 309                 .get = fpregs32_get, .set = fpregs32_set
 310         },
 311 };
 312
 313 static const struct user_regset_view user_sparc32_view = {
 314         .name = "sparc", .e_machine = EM_SPARC,
 315         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 316 };
 317
 318 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 319 {
 320         return &user_sparc32_view;
 321 }
 322
 323 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 324 {
 325         unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
 326         const struct user_regset_view *view;
 327         int ret;
 328
 329         view = task_user_regset_view(current);
 330
 331         switch(request) {
 332         case PTRACE_GETREGS: {
 333                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 334
 335                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 336                                           32 * sizeof(u32),
 337                                           4 * sizeof(u32),
 338                                           &pregs->psr);
 339                 if (!ret)
 340                         copy_regset_to_user(child, view, REGSET_GENERAL,
 341                                             1 * sizeof(u32),
 342                                             15 * sizeof(u32),
 343                                             &pregs->u_regs[0]);
 344                 break;
 345         }
 346
 347         case PTRACE_SETREGS: {
 348                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 349
 350                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 351                                             32 * sizeof(u32),
 352                                             4 * sizeof(u32),
 353                                             &pregs->psr);
 354                 if (!ret)
 355                         copy_regset_from_user(child, view, REGSET_GENERAL,
 356                                               1 * sizeof(u32),
 357                                               15 * sizeof(u32),
 358                                               &pregs->u_regs[0]);
 359                 break;
 360         }
 361
 362         case PTRACE_GETFPREGS: {
 363                 struct fps {
 364                         unsigned long regs[32];
 365                         unsigned long fsr;
 366                         unsigned long flags;
 367                         unsigned long extra;
 368                         unsigned long fpqd;
 369                         struct fq {
 370                                 unsigned long *insnaddr;
 371                                 unsigned long insn;
 372                         } fpq[16];
 373                 };
 374                 struct fps __user *fps = (struct fps __user *) addr;
 375
 376                 ret = copy_regset_to_user(child, view, REGSET_FP,
 377                                           0 * sizeof(u32),
 378                                           32 * sizeof(u32),
 379                                           &fps->regs[0]);
 380                 if (!ret)
 381                         ret = copy_regset_to_user(child, view, REGSET_FP,
 382                                                   33 * sizeof(u32),
 383                                                   1 * sizeof(u32),
 384                                                   &fps->fsr);
 385
 386                 if (!ret) {
 387                         if (__put_user(0, &fps->fpqd) ||
 388                             __put_user(0, &fps->flags) ||
 389                             __put_user(0, &fps->extra) ||
 390                             clear_user(fps->fpq, sizeof(fps->fpq)))
 391                                 ret = -EFAULT;
 392                 }
 393                 break;
 394         }
 395
 396         case PTRACE_SETFPREGS: {
 397                 struct fps {
 398                         unsigned long regs[32];
 399                         unsigned long fsr;
 400                         unsigned long flags;
 401                         unsigned long extra;
 402                         unsigned long fpqd;
 403                         struct fq {
 404                                 unsigned long *insnaddr;
 405                                 unsigned long insn;
 406                         } fpq[16];
 407                 };
 408                 struct fps __user *fps = (struct fps __user *) addr;
 409
 410                 ret = copy_regset_from_user(child, view, REGSET_FP,
 411                                             0 * sizeof(u32),
 412                                             32 * sizeof(u32),
 413                                             &fps->regs[0]);
 414                 if (!ret)
 415                         ret = copy_regset_from_user(child, view, REGSET_FP,
 416                                                     33 * sizeof(u32),
 417                                                     1 * sizeof(u32),
 418                                                     &fps->fsr);
 419                 break;
 420         }
 421
 422         case PTRACE_READTEXT:
 423         case PTRACE_READDATA:
 424                 ret = ptrace_readdata(child, addr,
 425                                       (void __user *) addr2, data);
 426
 427                 if (ret == data)
 428                         ret = 0;
 429                 else if (ret >= 0)
 430                         ret = -EIO;
 431                 break;
 432
 433         case PTRACE_WRITETEXT:
 434         case PTRACE_WRITEDATA:
 435                 ret = ptrace_writedata(child, (void __user *) addr2,
 436                                        addr, data);
 437
 438                 if (ret == data)
 439                         ret = 0;
 440                 else if (ret >= 0)
 441                         ret = -EIO;
 442                 break;
 443
 444         default:
 445                 if (request == PTRACE_SPARC_DETACH)
 446                         request = PTRACE_DETACH;
 447                 ret = ptrace_request(child, request, addr, data);
 448                 break;
 449         }
 450
 451         return ret;
 452 }
 453
 454 asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 455 {
 456         int ret = 0;
 457
 458         if (test_thread_flag(TIF_SYSCALL_TRACE)) {
 459                 if (syscall_exit_p)
 460                         tracehook_report_syscall_exit(regs, 0);
 461                 else
 462                         ret = tracehook_report_syscall_entry(regs);
 463         }
 464
 465         return ret;
 466 }