arch/sparc/kernel/ptrace_32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* ptrace.c: Sparc process tracing support.
   3  *
   4  * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
   5  *
   6  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
   7  * and David Mosberger.
   8  *
   9  * Added Linux support -miguel (weird, eh?, the original code was meant
  10  * to emulate SunOS).
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/errno.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/user.h>
  19 #include <linux/smp.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 <linux/uaccess.h>
  27 #include <asm/cacheflush.h>
  28
  29 #include "kernel.h"
  30
  31 /* #define ALLOW_INIT_TRACING */
  32
  33 /*
  34  * Called by kernel/ptrace.c when detaching..
  35  *
  36  * Make sure single step bits etc are not set.
  37  */
  38 void ptrace_disable(struct task_struct *child)
  39 {
  40         /* nothing to do */
  41 }
  42
  43 enum sparc_regset {
  44         REGSET_GENERAL,
  45         REGSET_FP,
  46 };
  47
  48 static int regwindow32_get(struct task_struct *target,
  49                            const struct pt_regs *regs,
  50                            u32 *uregs)
  51 {
  52         unsigned long reg_window = regs->u_regs[UREG_I6];
  53         int size = 16 * sizeof(u32);
  54
  55         if (target == current) {
  56                 if (copy_from_user(uregs, (void __user *)reg_window, size))
  57                         return -EFAULT;
  58         } else {
  59                 if (access_process_vm(target, reg_window, uregs, size,
  60                                       FOLL_FORCE) != size)
  61                         return -EFAULT;
  62         }
  63         return 0;
  64 }
  65
  66 static int regwindow32_set(struct task_struct *target,
  67                            const struct pt_regs *regs,
  68                            u32 *uregs)
  69 {
  70         unsigned long reg_window = regs->u_regs[UREG_I6];
  71         int size = 16 * sizeof(u32);
  72
  73         if (target == current) {
  74                 if (copy_to_user((void __user *)reg_window, uregs, size))
  75                         return -EFAULT;
  76         } else {
  77                 if (access_process_vm(target, reg_window, uregs, size,
  78                                       FOLL_FORCE | FOLL_WRITE) != size)
  79                         return -EFAULT;
  80         }
  81         return 0;
  82 }
  83
  84 static int genregs32_get(struct task_struct *target,
  85                          const struct user_regset *regset,
  86                          struct membuf to)
  87 {
  88         const struct pt_regs *regs = target->thread.kregs;
  89         u32 uregs[16];
  90
  91         if (target == current)
  92                 flush_user_windows();
  93
  94         membuf_write(&to, regs->u_regs, 16 * sizeof(u32));
  95         if (!to.left)
  96                 return 0;
  97         if (regwindow32_get(target, regs, uregs))
  98                 return -EFAULT;
  99         membuf_write(&to, uregs, 16 * sizeof(u32));
 100         membuf_store(&to, regs->psr);
 101         membuf_store(&to, regs->pc);
 102         membuf_store(&to, regs->npc);
 103         membuf_store(&to, regs->y);
 104         return membuf_zero(&to, 2 * sizeof(u32));
 105 }
 106
 107 static int genregs32_set(struct task_struct *target,
 108                          const struct user_regset *regset,
 109                          unsigned int pos, unsigned int count,
 110                          const void *kbuf, const void __user *ubuf)
 111 {
 112         struct pt_regs *regs = target->thread.kregs;
 113         u32 uregs[16];
 114         u32 psr;
 115         int ret;
 116
 117         if (target == current)
 118                 flush_user_windows();
 119
 120         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 121                                  regs->u_regs,
 122                                  0, 16 * sizeof(u32));
 123         if (ret || !count)
 124                 return ret;
 125
 126         if (regwindow32_get(target, regs, uregs))
 127                 return -EFAULT;
 128         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 129                                  uregs,
 130                                  16 * sizeof(u32), 32 * sizeof(u32));
 131         if (ret)
 132                 return ret;
 133         if (regwindow32_set(target, regs, uregs))
 134                 return -EFAULT;
 135         if (!count)
 136                 return 0;
 137
 138         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 139                                  &psr,
 140                                  32 * sizeof(u32), 33 * sizeof(u32));
 141         if (ret)
 142                 return ret;
 143         regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
 144                     (psr & (PSR_ICC | PSR_SYSCALL));
 145         if (!count)
 146                 return 0;
 147         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 148                                  &regs->pc,
 149                                  33 * sizeof(u32), 34 * sizeof(u32));
 150         if (ret || !count)
 151                 return ret;
 152         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 153                                  &regs->npc,
 154                                  34 * sizeof(u32), 35 * sizeof(u32));
 155         if (ret || !count)
 156                 return ret;
 157         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 158                                  &regs->y,
 159                                  35 * sizeof(u32), 36 * sizeof(u32));
 160         if (ret || !count)
 161                 return ret;
 162         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 163                                          36 * sizeof(u32), 38 * sizeof(u32));
 164 }
 165
 166 static int fpregs32_get(struct task_struct *target,
 167                         const struct user_regset *regset,
 168                         struct membuf to)
 169 {
 170 #if 0
 171         if (target == current)
 172                 save_and_clear_fpu();
 173 #endif
 174
 175         membuf_write(&to, target->thread.float_regs, 32 * sizeof(u32));
 176         membuf_zero(&to, sizeof(u32));
 177         membuf_write(&to, &target->thread.fsr, sizeof(u32));
 178         membuf_store(&to, (u32)((1 << 8) | (8 << 16)));
 179         return membuf_zero(&to, 64 * sizeof(u32));
 180 }
 181
 182 static int fpregs32_set(struct task_struct *target,
 183                         const struct user_regset *regset,
 184                         unsigned int pos, unsigned int count,
 185                         const void *kbuf, const void __user *ubuf)
 186 {
 187         unsigned long *fpregs = target->thread.float_regs;
 188         int ret;
 189
 190 #if 0
 191         if (target == current)
 192                 save_and_clear_fpu();
 193 #endif
 194         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 195                                  fpregs,
 196                                  0, 32 * sizeof(u32));
 197         if (!ret)
 198                 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 199                                           32 * sizeof(u32),
 200                                           33 * sizeof(u32));
 201         if (!ret)
 202                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 203                                          &target->thread.fsr,
 204                                          33 * sizeof(u32),
 205                                          34 * sizeof(u32));
 206         if (!ret)
 207                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 208                                                 34 * sizeof(u32), -1);
 209         return ret;
 210 }
 211
 212 static const struct user_regset sparc32_regsets[] = {
 213         /* Format is:
 214          *      G0 --> G7
 215          *      O0 --> O7
 216          *      L0 --> L7
 217          *      I0 --> I7
 218          *      PSR, PC, nPC, Y, WIM, TBR
 219          */
 220         [REGSET_GENERAL] = {
 221                 .core_note_type = NT_PRSTATUS,
 222                 .n = 38,
 223                 .size = sizeof(u32), .align = sizeof(u32),
 224                 .regset_get = genregs32_get, .set = genregs32_set
 225         },
 226         /* Format is:
 227          *      F0 --> F31
 228          *      empty 32-bit word
 229          *      FSR (32--bit word)
 230          *      FPU QUEUE COUNT (8-bit char)
 231          *      FPU QUEUE ENTRYSIZE (8-bit char)
 232          *      FPU ENABLED (8-bit char)
 233          *      empty 8-bit char
 234          *      FPU QUEUE (64 32-bit ints)
 235          */
 236         [REGSET_FP] = {
 237                 .core_note_type = NT_PRFPREG,
 238                 .n = 99,
 239                 .size = sizeof(u32), .align = sizeof(u32),
 240                 .regset_get = fpregs32_get, .set = fpregs32_set
 241         },
 242 };
 243
 244 static int getregs_get(struct task_struct *target,
 245                          const struct user_regset *regset,
 246                          struct membuf to)
 247 {
 248         const struct pt_regs *regs = target->thread.kregs;
 249
 250         if (target == current)
 251                 flush_user_windows();
 252
 253         membuf_store(&to, regs->psr);
 254         membuf_store(&to, regs->pc);
 255         membuf_store(&to, regs->npc);
 256         membuf_store(&to, regs->y);
 257         return membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u32));
 258 }
 259
 260 static int setregs_set(struct task_struct *target,
 261                          const struct user_regset *regset,
 262                          unsigned int pos, unsigned int count,
 263                          const void *kbuf, const void __user *ubuf)
 264 {
 265         struct pt_regs *regs = target->thread.kregs;
 266         u32 v[4];
 267         int ret;
 268
 269         if (target == current)
 270                 flush_user_windows();
 271
 272         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 273                                  v,
 274                                  0, 4 * sizeof(u32));
 275         if (ret)
 276                 return ret;
 277         regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
 278                     (v[0] & (PSR_ICC | PSR_SYSCALL));
 279         regs->pc = v[1];
 280         regs->npc = v[2];
 281         regs->y = v[3];
 282         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 283                                  regs->u_regs + 1,
 284                                  4 * sizeof(u32) , 19 * sizeof(u32));
 285 }
 286
 287 static int getfpregs_get(struct task_struct *target,
 288                         const struct user_regset *regset,
 289                         struct membuf to)
 290 {
 291 #if 0
 292         if (target == current)
 293                 save_and_clear_fpu();
 294 #endif
 295         membuf_write(&to, &target->thread.float_regs, 32 * sizeof(u32));
 296         membuf_write(&to, &target->thread.fsr, sizeof(u32));
 297         return membuf_zero(&to, 35 * sizeof(u32));
 298 }
 299
 300 static int setfpregs_set(struct task_struct *target,
 301                         const struct user_regset *regset,
 302                         unsigned int pos, unsigned int count,
 303                         const void *kbuf, const void __user *ubuf)
 304 {
 305         unsigned long *fpregs = target->thread.float_regs;
 306         int ret;
 307
 308 #if 0
 309         if (target == current)
 310                 save_and_clear_fpu();
 311 #endif
 312         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 313                                  fpregs,
 314                                  0, 32 * sizeof(u32));
 315         if (ret)
 316                 return ret;
 317         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 318                                  &target->thread.fsr,
 319                                  32 * sizeof(u32),
 320                                  33 * sizeof(u32));
 321 }
 322
 323 static const struct user_regset ptrace32_regsets[] = {
 324         [REGSET_GENERAL] = {
 325                 .n = 19, .size = sizeof(u32),
 326                 .regset_get = getregs_get, .set = setregs_set,
 327         },
 328         [REGSET_FP] = {
 329                 .n = 68, .size = sizeof(u32),
 330                 .regset_get = getfpregs_get, .set = setfpregs_set,
 331         },
 332 };
 333
 334 static const struct user_regset_view ptrace32_view = {
 335         .regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets)
 336 };
 337
 338 static const struct user_regset_view user_sparc32_view = {
 339         .name = "sparc", .e_machine = EM_SPARC,
 340         .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
 341 };
 342
 343 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 344 {
 345         return &user_sparc32_view;
 346 }
 347
 348 struct fps {
 349         unsigned long regs[32];
 350         unsigned long fsr;
 351         unsigned long flags;
 352         unsigned long extra;
 353         unsigned long fpqd;
 354         struct fq {
 355                 unsigned long *insnaddr;
 356                 unsigned long insn;
 357         } fpq[16];
 358 };
 359
 360 long arch_ptrace(struct task_struct *child, long request,
 361                  unsigned long addr, unsigned long data)
 362 {
 363         unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
 364         void __user *addr2p;
 365         struct pt_regs __user *pregs;
 366         struct fps __user *fps;
 367         int ret;
 368
 369         addr2p = (void __user *) addr2;
 370         pregs = (struct pt_regs __user *) addr;
 371         fps = (struct fps __user *) addr;
 372
 373         switch(request) {
 374         case PTRACE_GETREGS: {
 375                 ret = copy_regset_to_user(child, &ptrace32_view,
 376                                           REGSET_GENERAL, 0,
 377                                           19 * sizeof(u32),
 378                                           pregs);
 379                 break;
 380         }
 381
 382         case PTRACE_SETREGS: {
 383                 ret = copy_regset_from_user(child, &ptrace32_view,
 384                                             REGSET_GENERAL, 0,
 385                                             19 * sizeof(u32),
 386                                             pregs);
 387                 break;
 388         }
 389
 390         case PTRACE_GETFPREGS: {
 391                 ret = copy_regset_to_user(child, &ptrace32_view,
 392                                           REGSET_FP, 0,
 393                                           68 * sizeof(u32),
 394                                           fps);
 395                 break;
 396         }
 397
 398         case PTRACE_SETFPREGS: {
 399                 ret = copy_regset_from_user(child, &ptrace32_view,
 400                                           REGSET_FP, 0,
 401                                           33 * sizeof(u32),
 402                                           fps);
 403                 break;
 404         }
 405
 406         case PTRACE_READTEXT:
 407         case PTRACE_READDATA:
 408                 ret = ptrace_readdata(child, addr, addr2p, data);
 409
 410                 if (ret == data)
 411                         ret = 0;
 412                 else if (ret >= 0)
 413                         ret = -EIO;
 414                 break;
 415
 416         case PTRACE_WRITETEXT:
 417         case PTRACE_WRITEDATA:
 418                 ret = ptrace_writedata(child, addr2p, addr, data);
 419
 420                 if (ret == data)
 421                         ret = 0;
 422                 else if (ret >= 0)
 423                         ret = -EIO;
 424                 break;
 425
 426         default:
 427                 if (request == PTRACE_SPARC_DETACH)
 428                         request = PTRACE_DETACH;
 429                 ret = ptrace_request(child, request, addr, data);
 430                 break;
 431         }
 432
 433         return ret;
 434 }
 435
 436 asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 437 {
 438         int ret = 0;
 439
 440         if (test_thread_flag(TIF_SYSCALL_TRACE)) {
 441                 if (syscall_exit_p)
 442                         tracehook_report_syscall_exit(regs, 0);
 443                 else
 444                         ret = tracehook_report_syscall_entry(regs);
 445         }
 446
 447         return ret;
 448 }