arch/sparc/kernel/ptrace_32.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/security.h>
  20 #include <linux/signal.h>
  21 #include <linux/regset.h>
  22 #include <linux/elf.h>
  23 #include <linux/tracehook.h>
  24
  25 #include <asm/pgtable.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/cacheflush.h>
  28
  29 /* #define ALLOW_INIT_TRACING */
  30
  31 /*
  32  * Called by kernel/ptrace.c when detaching..
  33  *
  34  * Make sure single step bits etc are not set.
  35  */
  36 void ptrace_disable(struct task_struct *child)
  37 {
  38         /* nothing to do */
  39 }
  40
  41 enum sparc_regset {
  42         REGSET_GENERAL,
  43         REGSET_FP,
  44 };
  45
  46 static int genregs32_get(struct task_struct *target,
  47                          const struct user_regset *regset,
  48                          unsigned int pos, unsigned int count,
  49                          void *kbuf, void __user *ubuf)
  50 {
  51         const struct pt_regs *regs = target->thread.kregs;
  52         unsigned long __user *reg_window;
  53         unsigned long *k = kbuf;
  54         unsigned long __user *u = ubuf;
  55         unsigned long reg;
  56
  57         if (target == current)
  58                 flush_user_windows();
  59
  60         pos /= sizeof(reg);
  61         count /= sizeof(reg);
  62
  63         if (kbuf) {
  64                 for (; count > 0 && pos < 16; count--)
  65                         *k++ = regs->u_regs[pos++];
  66
  67                 reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
  68                 reg_window -= 16;
  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                 reg_window -= 16;
  81                 for (; count > 0 && pos < 32; count--) {
  82                         if (get_user(reg, &reg_window[pos++]) ||
  83                             put_user(reg, u++))
  84                                 return -EFAULT;
  85                 }
  86         }
  87         while (count > 0) {
  88                 switch (pos) {
  89                 case 32: /* PSR */
  90                         reg = regs->psr;
  91                         break;
  92                 case 33: /* PC */
  93                         reg = regs->pc;
  94                         break;
  95                 case 34: /* NPC */
  96                         reg = regs->npc;
  97                         break;
  98                 case 35: /* Y */
  99                         reg = regs->y;
 100                         break;
 101                 case 36: /* WIM */
 102                 case 37: /* TBR */
 103                         reg = 0;
 104                         break;
 105                 default:
 106                         goto finish;
 107                 }
 108
 109                 if (kbuf)
 110                         *k++ = reg;
 111                 else if (put_user(reg, u++))
 112                         return -EFAULT;
 113                 pos++;
 114                 count--;
 115         }
 116 finish:
 117         pos *= sizeof(reg);
 118         count *= sizeof(reg);
 119
 120         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 121                                         38 * sizeof(reg), -1);
 122 }
 123
 124 static int genregs32_set(struct task_struct *target,
 125                          const struct user_regset *regset,
 126                          unsigned int pos, unsigned int count,
 127                          const void *kbuf, const void __user *ubuf)
 128 {
 129         struct pt_regs *regs = target->thread.kregs;
 130         unsigned long __user *reg_window;
 131         const unsigned long *k = kbuf;
 132         const unsigned long __user *u = ubuf;
 133         unsigned long reg;
 134
 135         if (target == current)
 136                 flush_user_windows();
 137
 138         pos /= sizeof(reg);
 139         count /= sizeof(reg);
 140
 141         if (kbuf) {
 142                 for (; count > 0 && pos < 16; count--)
 143                         regs->u_regs[pos++] = *k++;
 144
 145                 reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 146                 reg_window -= 16;
 147                 for (; count > 0 && pos < 32; count--) {
 148                         if (put_user(*k++, &reg_window[pos++]))
 149                                 return -EFAULT;
 150                 }
 151         } else {
 152                 for (; count > 0 && pos < 16; count--) {
 153                         if (get_user(reg, u++))
 154                                 return -EFAULT;
 155                         regs->u_regs[pos++] = reg;
 156                 }
 157
 158                 reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
 159                 reg_window -= 16;
 160                 for (; count > 0 && pos < 32; count--) {
 161                         if (get_user(reg, u++) ||
 162                             put_user(reg, &reg_window[pos++]))
 163                                 return -EFAULT;
 164                 }
 165         }
 166         while (count > 0) {
 167                 unsigned long psr;
 168
 169                 if (kbuf)
 170                         reg = *k++;
 171                 else if (get_user(reg, u++))
 172                         return -EFAULT;
 173
 174                 switch (pos) {
 175                 case 32: /* PSR */
 176                         psr = regs->psr;
 177                         psr &= ~(PSR_ICC | PSR_SYSCALL);
 178                         psr |= (reg & (PSR_ICC | PSR_SYSCALL));
 179                         regs->psr = psr;
 180                         break;
 181                 case 33: /* PC */
 182                         regs->pc = reg;
 183                         break;
 184                 case 34: /* NPC */
 185                         regs->npc = reg;
 186                         break;
 187                 case 35: /* Y */
 188                         regs->y = reg;
 189                         break;
 190                 case 36: /* WIM */
 191                 case 37: /* TBR */
 192                         break;
 193                 default:
 194                         goto finish;
 195                 }
 196
 197                 pos++;
 198                 count--;
 199         }
 200 finish:
 201         pos *= sizeof(reg);
 202         count *= sizeof(reg);
 203
 204         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 205                                          38 * sizeof(reg), -1);
 206 }
 207
 208 static int fpregs32_get(struct task_struct *target,
 209                         const struct user_regset *regset,
 210                         unsigned int pos, unsigned int count,
 211                         void *kbuf, void __user *ubuf)
 212 {
 213         const unsigned long *fpregs = target->thread.float_regs;
 214         int ret = 0;
 215
 216 #if 0
 217         if (target == current)
 218                 save_and_clear_fpu();
 219 #endif
 220
 221         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 222                                   fpregs,
 223                                   0, 32 * sizeof(u32));
 224
 225         if (!ret)
 226                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 227                                                32 * sizeof(u32),
 228                                                33 * sizeof(u32));
 229         if (!ret)
 230                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 231                                           &target->thread.fsr,
 232                                           33 * sizeof(u32),
 233                                           34 * sizeof(u32));
 234
 235         if (!ret) {
 236                 unsigned long val;
 237
 238                 val = (1 << 8) | (8 << 16);
 239                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 240                                           &val,
 241                                           34 * sizeof(u32),
 242                                           35 * sizeof(u32));
 243         }
 244
 245         if (!ret)
 246                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 247                                                35 * sizeof(u32), -1);
 248
 249         return ret;
 250 }
 251
 252 static int fpregs32_set(struct task_struct *target,
 253                         const struct user_regset *regset,
 254                         unsigned int pos, unsigned int count,
 255                         const void *kbuf, const void __user *ubuf)
 256 {
 257         unsigned long *fpregs = target->thread.float_regs;
 258         int ret;
 259
 260 #if 0
 261         if (target == current)
 262                 save_and_clear_fpu();
 263 #endif
 264         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 265                                  fpregs,
 266                                  0, 32 * sizeof(u32));
 267         if (!ret)
 268                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 269                                           32 * sizeof(u32),
 270                                           33 * sizeof(u32));
 271         if (!ret && count > 0) {
 272                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 273                                          &target->thread.fsr,
 274                                          33 * sizeof(u32),
 275                                          34 * sizeof(u32));
 276         }
 277
 278         if (!ret)
 279                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 280                                                 34 * sizeof(u32), -1);
 281         return ret;
 282 }
 283
 284 static const struct user_regset sparc32_regsets[] = {
 285         /* Format is:
 286          *      G0 --> G7
 287          *      O0 --> O7
 288          *      L0 --> L7
 289          *      I0 --> I7
 290          *      PSR, PC, nPC, Y, WIM, TBR
 291          */
 292         [REGSET_GENERAL] = {
 293                 .core_note_type = NT_PRSTATUS,
 294                 .n = 38,
 295                 .size = sizeof(u32), .align = sizeof(u32),
 296                 .get = genregs32_get, .set = genregs32_set
 297         },
 298         /* Format is:
 299          *      F0 --> F31
 300          *      empty 32-bit word
 301          *      FSR (32--bit word)
 302          *      FPU QUEUE COUNT (8-bit char)
 303          *      FPU QUEUE ENTRYSIZE (8-bit char)
 304          *      FPU ENABLED (8-bit char)
 305          *      empty 8-bit char
 306          *      FPU QUEUE (64 32-bit ints)
 307          */
 308         [REGSET_FP] = {
 309                 .core_note_type = NT_PRFPREG,
 310                 .n = 99,
 311                 .size = sizeof(u32), .align = sizeof(u32),
 312                 .get = fpregs32_get, .set = fpregs32_set
 313         },
 314 };
 315
 316 static const struct user_regset_view user_sparc32_view = {
 317         .name = "sparc", .e_machine = EM_SPARC,
 318         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 319 };
 320
 321 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 322 {
 323         return &user_sparc32_view;
 324 }
 325
 326 struct fps {
 327         unsigned long regs[32];
 328         unsigned long fsr;
 329         unsigned long flags;
 330         unsigned long extra;
 331         unsigned long fpqd;
 332         struct fq {
 333                 unsigned long *insnaddr;
 334                 unsigned long insn;
 335         } fpq[16];
 336 };
 337
 338 long arch_ptrace(struct task_struct *child, long request,
 339                  unsigned long addr, unsigned long data)
 340 {
 341         unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
 342         void __user *addr2p;
 343         const struct user_regset_view *view;
 344         struct pt_regs __user *pregs;
 345         struct fps __user *fps;
 346         int ret;
 347
 348         view = task_user_regset_view(current);
 349         addr2p = (void __user *) addr2;
 350         pregs = (struct pt_regs __user *) addr;
 351         fps = (struct fps __user *) addr;
 352
 353         switch(request) {
 354         case PTRACE_GETREGS: {
 355                 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
 356                                           32 * sizeof(u32),
 357                                           4 * sizeof(u32),
 358                                           &pregs->psr);
 359                 if (!ret)
 360                         copy_regset_to_user(child, view, REGSET_GENERAL,
 361                                             1 * sizeof(u32),
 362                                             15 * sizeof(u32),
 363                                             &pregs->u_regs[0]);
 364                 break;
 365         }
 366
 367         case PTRACE_SETREGS: {
 368                 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
 369                                             32 * sizeof(u32),
 370                                             4 * sizeof(u32),
 371                                             &pregs->psr);
 372                 if (!ret)
 373                         copy_regset_from_user(child, view, REGSET_GENERAL,
 374                                               1 * sizeof(u32),
 375                                               15 * sizeof(u32),
 376                                               &pregs->u_regs[0]);
 377                 break;
 378         }
 379
 380         case PTRACE_GETFPREGS: {
 381                 ret = copy_regset_to_user(child, view, REGSET_FP,
 382                                           0 * sizeof(u32),
 383                                           32 * sizeof(u32),
 384                                           &fps->regs[0]);
 385                 if (!ret)
 386                         ret = copy_regset_to_user(child, view, REGSET_FP,
 387                                                   33 * sizeof(u32),
 388                                                   1 * sizeof(u32),
 389                                                   &fps->fsr);
 390
 391                 if (!ret) {
 392                         if (__put_user(0, &fps->fpqd) ||
 393                             __put_user(0, &fps->flags) ||
 394                             __put_user(0, &fps->extra) ||
 395                             clear_user(fps->fpq, sizeof(fps->fpq)))
 396                                 ret = -EFAULT;
 397                 }
 398                 break;
 399         }
 400
 401         case PTRACE_SETFPREGS: {
 402                 ret = copy_regset_from_user(child, view, REGSET_FP,
 403                                             0 * sizeof(u32),
 404                                             32 * sizeof(u32),
 405                                             &fps->regs[0]);
 406                 if (!ret)
 407                         ret = copy_regset_from_user(child, view, REGSET_FP,
 408                                                     33 * sizeof(u32),
 409                                                     1 * sizeof(u32),
 410                                                     &fps->fsr);
 411                 break;
 412         }
 413
 414         case PTRACE_READTEXT:
 415         case PTRACE_READDATA:
 416                 ret = ptrace_readdata(child, addr, addr2p, data);
 417
 418                 if (ret == data)
 419                         ret = 0;
 420                 else if (ret >= 0)
 421                         ret = -EIO;
 422                 break;
 423
 424         case PTRACE_WRITETEXT:
 425         case PTRACE_WRITEDATA:
 426                 ret = ptrace_writedata(child, addr2p, addr, data);
 427
 428                 if (ret == data)
 429                         ret = 0;
 430                 else if (ret >= 0)
 431                         ret = -EIO;
 432                 break;
 433
 434         default:
 435                 if (request == PTRACE_SPARC_DETACH)
 436                         request = PTRACE_DETACH;
 437                 ret = ptrace_request(child, request, addr, data);
 438                 break;
 439         }
 440
 441         return ret;
 442 }
 443
 444 asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 445 {
 446         int ret = 0;
 447
 448         if (test_thread_flag(TIF_SYSCALL_TRACE)) {
 449                 if (syscall_exit_p)
 450                         tracehook_report_syscall_exit(regs, 0);
 451                 else
 452                         ret = tracehook_report_syscall_entry(regs);
 453         }
 454
 455         return ret;
 456 }