arch/powerpc/kernel/ptrace/ptrace-view.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <linux/regset.h>
   4 #include <linux/elf.h>
   5 #include <linux/nospec.h>
   6 #include <linux/pkeys.h>
   7
   8 #include "ptrace-decl.h"
   9
  10 struct pt_regs_offset {
  11         const char *name;
  12         int offset;
  13 };
  14
  15 #define STR(s)  #s                      /* convert to string */
  16 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
  17 #define GPR_OFFSET_NAME(num)    \
  18         {.name = STR(r##num), .offset = offsetof(struct pt_regs, gpr[num])}, \
  19         {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
  20 #define REG_OFFSET_END {.name = NULL, .offset = 0}
  21
  22 static const struct pt_regs_offset regoffset_table[] = {
  23         GPR_OFFSET_NAME(0),
  24         GPR_OFFSET_NAME(1),
  25         GPR_OFFSET_NAME(2),
  26         GPR_OFFSET_NAME(3),
  27         GPR_OFFSET_NAME(4),
  28         GPR_OFFSET_NAME(5),
  29         GPR_OFFSET_NAME(6),
  30         GPR_OFFSET_NAME(7),
  31         GPR_OFFSET_NAME(8),
  32         GPR_OFFSET_NAME(9),
  33         GPR_OFFSET_NAME(10),
  34         GPR_OFFSET_NAME(11),
  35         GPR_OFFSET_NAME(12),
  36         GPR_OFFSET_NAME(13),
  37         GPR_OFFSET_NAME(14),
  38         GPR_OFFSET_NAME(15),
  39         GPR_OFFSET_NAME(16),
  40         GPR_OFFSET_NAME(17),
  41         GPR_OFFSET_NAME(18),
  42         GPR_OFFSET_NAME(19),
  43         GPR_OFFSET_NAME(20),
  44         GPR_OFFSET_NAME(21),
  45         GPR_OFFSET_NAME(22),
  46         GPR_OFFSET_NAME(23),
  47         GPR_OFFSET_NAME(24),
  48         GPR_OFFSET_NAME(25),
  49         GPR_OFFSET_NAME(26),
  50         GPR_OFFSET_NAME(27),
  51         GPR_OFFSET_NAME(28),
  52         GPR_OFFSET_NAME(29),
  53         GPR_OFFSET_NAME(30),
  54         GPR_OFFSET_NAME(31),
  55         REG_OFFSET_NAME(nip),
  56         REG_OFFSET_NAME(msr),
  57         REG_OFFSET_NAME(ctr),
  58         REG_OFFSET_NAME(link),
  59         REG_OFFSET_NAME(xer),
  60         REG_OFFSET_NAME(ccr),
  61 #ifdef CONFIG_PPC64
  62         REG_OFFSET_NAME(softe),
  63 #else
  64         REG_OFFSET_NAME(mq),
  65 #endif
  66         REG_OFFSET_NAME(trap),
  67         REG_OFFSET_NAME(dar),
  68         REG_OFFSET_NAME(dsisr),
  69         REG_OFFSET_END,
  70 };
  71
  72 /**
  73  * regs_query_register_offset() - query register offset from its name
  74  * @name:       the name of a register
  75  *
  76  * regs_query_register_offset() returns the offset of a register in struct
  77  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
  78  */
  79 int regs_query_register_offset(const char *name)
  80 {
  81         const struct pt_regs_offset *roff;
  82         for (roff = regoffset_table; roff->name != NULL; roff++)
  83                 if (!strcmp(roff->name, name))
  84                         return roff->offset;
  85         return -EINVAL;
  86 }
  87
  88 /**
  89  * regs_query_register_name() - query register name from its offset
  90  * @offset:     the offset of a register in struct pt_regs.
  91  *
  92  * regs_query_register_name() returns the name of a register from its
  93  * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
  94  */
  95 const char *regs_query_register_name(unsigned int offset)
  96 {
  97         const struct pt_regs_offset *roff;
  98         for (roff = regoffset_table; roff->name != NULL; roff++)
  99                 if (roff->offset == offset)
 100                         return roff->name;
 101         return NULL;
 102 }
 103
 104 /*
 105  * does not yet catch signals sent when the child dies.
 106  * in exit.c or in signal.c.
 107  */
 108
 109 static unsigned long get_user_msr(struct task_struct *task)
 110 {
 111         return task->thread.regs->msr | task->thread.fpexc_mode;
 112 }
 113
 114 static int set_user_msr(struct task_struct *task, unsigned long msr)
 115 {
 116         task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
 117         task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
 118         return 0;
 119 }
 120
 121 #ifdef CONFIG_PPC64
 122 static int get_user_dscr(struct task_struct *task, unsigned long *data)
 123 {
 124         *data = task->thread.dscr;
 125         return 0;
 126 }
 127
 128 static int set_user_dscr(struct task_struct *task, unsigned long dscr)
 129 {
 130         task->thread.dscr = dscr;
 131         task->thread.dscr_inherit = 1;
 132         return 0;
 133 }
 134 #else
 135 static int get_user_dscr(struct task_struct *task, unsigned long *data)
 136 {
 137         return -EIO;
 138 }
 139
 140 static int set_user_dscr(struct task_struct *task, unsigned long dscr)
 141 {
 142         return -EIO;
 143 }
 144 #endif
 145
 146 /*
 147  * We prevent mucking around with the reserved area of trap
 148  * which are used internally by the kernel.
 149  */
 150 static int set_user_trap(struct task_struct *task, unsigned long trap)
 151 {
 152         set_trap(task->thread.regs, trap);
 153         return 0;
 154 }
 155
 156 /*
 157  * Get contents of register REGNO in task TASK.
 158  */
 159 int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data)
 160 {
 161         unsigned int regs_max;
 162
 163         if (task->thread.regs == NULL || !data)
 164                 return -EIO;
 165
 166         if (regno == PT_MSR) {
 167                 *data = get_user_msr(task);
 168                 return 0;
 169         }
 170
 171         if (regno == PT_DSCR)
 172                 return get_user_dscr(task, data);
 173
 174         /*
 175          * softe copies paca->irq_soft_mask variable state. Since irq_soft_mask is
 176          * no more used as a flag, lets force usr to alway see the softe value as 1
 177          * which means interrupts are not soft disabled.
 178          */
 179         if (IS_ENABLED(CONFIG_PPC64) && regno == PT_SOFTE) {
 180                 *data = 1;
 181                 return  0;
 182         }
 183
 184         regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long);
 185         if (regno < regs_max) {
 186                 regno = array_index_nospec(regno, regs_max);
 187                 *data = ((unsigned long *)task->thread.regs)[regno];
 188                 return 0;
 189         }
 190
 191         return -EIO;
 192 }
 193
 194 /*
 195  * Write contents of register REGNO in task TASK.
 196  */
 197 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
 198 {
 199         if (task->thread.regs == NULL)
 200                 return -EIO;
 201
 202         if (regno == PT_MSR)
 203                 return set_user_msr(task, data);
 204         if (regno == PT_TRAP)
 205                 return set_user_trap(task, data);
 206         if (regno == PT_DSCR)
 207                 return set_user_dscr(task, data);
 208
 209         if (regno <= PT_MAX_PUT_REG) {
 210                 regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1);
 211                 ((unsigned long *)task->thread.regs)[regno] = data;
 212                 return 0;
 213         }
 214         return -EIO;
 215 }
 216
 217 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
 218                    struct membuf to)
 219 {
 220         struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
 221 #ifdef CONFIG_PPC64
 222         struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
 223 #endif
 224         int i;
 225
 226         if (target->thread.regs == NULL)
 227                 return -EIO;
 228
 229         if (!FULL_REGS(target->thread.regs)) {
 230                 /* We have a partial register set.  Fill 14-31 with bogus values */
 231                 for (i = 14; i < 32; i++)
 232                         target->thread.regs->gpr[i] = NV_REG_POISON;
 233         }
 234
 235         membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs));
 236
 237         membuf_store(&to_msr, get_user_msr(target));
 238 #ifdef CONFIG_PPC64
 239         membuf_store(&to_softe, 0x1ul);
 240 #endif
 241         return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
 242                                  sizeof(struct user_pt_regs));
 243 }
 244
 245 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
 246                    unsigned int pos, unsigned int count, const void *kbuf,
 247                    const void __user *ubuf)
 248 {
 249         unsigned long reg;
 250         int ret;
 251
 252         if (target->thread.regs == NULL)
 253                 return -EIO;
 254
 255         CHECK_FULL_REGS(target->thread.regs);
 256
 257         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 258                                  target->thread.regs,
 259                                  0, PT_MSR * sizeof(reg));
 260
 261         if (!ret && count > 0) {
 262                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 263                                          PT_MSR * sizeof(reg),
 264                                          (PT_MSR + 1) * sizeof(reg));
 265                 if (!ret)
 266                         ret = set_user_msr(target, reg);
 267         }
 268
 269         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
 270                      offsetof(struct pt_regs, msr) + sizeof(long));
 271
 272         if (!ret)
 273                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 274                                          &target->thread.regs->orig_gpr3,
 275                                          PT_ORIG_R3 * sizeof(reg),
 276                                          (PT_MAX_PUT_REG + 1) * sizeof(reg));
 277
 278         if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
 279                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 280                                                 (PT_MAX_PUT_REG + 1) * sizeof(reg),
 281                                                 PT_TRAP * sizeof(reg));
 282
 283         if (!ret && count > 0) {
 284                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 285                                          PT_TRAP * sizeof(reg),
 286                                          (PT_TRAP + 1) * sizeof(reg));
 287                 if (!ret)
 288                         ret = set_user_trap(target, reg);
 289         }
 290
 291         if (!ret)
 292                 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 293                                                 (PT_TRAP + 1) * sizeof(reg), -1);
 294
 295         return ret;
 296 }
 297
 298 #ifdef CONFIG_PPC64
 299 static int ppr_get(struct task_struct *target, const struct user_regset *regset,
 300                    struct membuf to)
 301 {
 302         return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64));
 303 }
 304
 305 static int ppr_set(struct task_struct *target, const struct user_regset *regset,
 306                    unsigned int pos, unsigned int count, const void *kbuf,
 307                    const void __user *ubuf)
 308 {
 309         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 310                                   &target->thread.regs->ppr, 0, sizeof(u64));
 311 }
 312
 313 static int dscr_get(struct task_struct *target, const struct user_regset *regset,
 314                     struct membuf to)
 315 {
 316         return membuf_write(&to, &target->thread.dscr, sizeof(u64));
 317 }
 318 static int dscr_set(struct task_struct *target, const struct user_regset *regset,
 319                     unsigned int pos, unsigned int count, const void *kbuf,
 320                     const void __user *ubuf)
 321 {
 322         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 323                                   &target->thread.dscr, 0, sizeof(u64));
 324 }
 325 #endif
 326 #ifdef CONFIG_PPC_BOOK3S_64
 327 static int tar_get(struct task_struct *target, const struct user_regset *regset,
 328                    struct membuf to)
 329 {
 330         return membuf_write(&to, &target->thread.tar, sizeof(u64));
 331 }
 332 static int tar_set(struct task_struct *target, const struct user_regset *regset,
 333                    unsigned int pos, unsigned int count, const void *kbuf,
 334                    const void __user *ubuf)
 335 {
 336         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 337                                   &target->thread.tar, 0, sizeof(u64));
 338 }
 339
 340 static int ebb_active(struct task_struct *target, const struct user_regset *regset)
 341 {
 342         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
 343                 return -ENODEV;
 344
 345         if (target->thread.used_ebb)
 346                 return regset->n;
 347
 348         return 0;
 349 }
 350
 351 static int ebb_get(struct task_struct *target, const struct user_regset *regset,
 352                    struct membuf to)
 353 {
 354         /* Build tests */
 355         BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
 356         BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
 357
 358         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
 359                 return -ENODEV;
 360
 361         if (!target->thread.used_ebb)
 362                 return -ENODATA;
 363
 364         return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long));
 365 }
 366
 367 static int ebb_set(struct task_struct *target, const struct user_regset *regset,
 368                    unsigned int pos, unsigned int count, const void *kbuf,
 369                    const void __user *ubuf)
 370 {
 371         int ret = 0;
 372
 373         /* Build tests */
 374         BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
 375         BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
 376
 377         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
 378                 return -ENODEV;
 379
 380         if (target->thread.used_ebb)
 381                 return -ENODATA;
 382
 383         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr,
 384                                  0, sizeof(unsigned long));
 385
 386         if (!ret)
 387                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 388                                          &target->thread.ebbhr, sizeof(unsigned long),
 389                                          2 * sizeof(unsigned long));
 390
 391         if (!ret)
 392                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 393                                          &target->thread.bescr, 2 * sizeof(unsigned long),
 394                                          3 * sizeof(unsigned long));
 395
 396         return ret;
 397 }
 398 static int pmu_active(struct task_struct *target, const struct user_regset *regset)
 399 {
 400         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
 401                 return -ENODEV;
 402
 403         return regset->n;
 404 }
 405
 406 static int pmu_get(struct task_struct *target, const struct user_regset *regset,
 407                    struct membuf to)
 408 {
 409         /* Build tests */
 410         BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
 411         BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
 412         BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
 413         BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
 414
 415         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
 416                 return -ENODEV;
 417
 418         return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long));
 419 }
 420
 421 static int pmu_set(struct task_struct *target, const struct user_regset *regset,
 422                    unsigned int pos, unsigned int count, const void *kbuf,
 423                    const void __user *ubuf)
 424 {
 425         int ret = 0;
 426
 427         /* Build tests */
 428         BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
 429         BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
 430         BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
 431         BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
 432
 433         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
 434                 return -ENODEV;
 435
 436         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar,
 437                                  0, sizeof(unsigned long));
 438
 439         if (!ret)
 440                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 441                                          &target->thread.sdar, sizeof(unsigned long),
 442                                          2 * sizeof(unsigned long));
 443
 444         if (!ret)
 445                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 446                                          &target->thread.sier, 2 * sizeof(unsigned long),
 447                                          3 * sizeof(unsigned long));
 448
 449         if (!ret)
 450                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 451                                          &target->thread.mmcr2, 3 * sizeof(unsigned long),
 452                                          4 * sizeof(unsigned long));
 453
 454         if (!ret)
 455                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 456                                          &target->thread.mmcr0, 4 * sizeof(unsigned long),
 457                                          5 * sizeof(unsigned long));
 458         return ret;
 459 }
 460 #endif
 461
 462 #ifdef CONFIG_PPC_MEM_KEYS
 463 static int pkey_active(struct task_struct *target, const struct user_regset *regset)
 464 {
 465         if (!arch_pkeys_enabled())
 466                 return -ENODEV;
 467
 468         return regset->n;
 469 }
 470
 471 static int pkey_get(struct task_struct *target, const struct user_regset *regset,
 472                     struct membuf to)
 473 {
 474
 475         if (!arch_pkeys_enabled())
 476                 return -ENODEV;
 477
 478         membuf_store(&to, target->thread.regs->amr);
 479         membuf_store(&to, target->thread.regs->iamr);
 480         return membuf_store(&to, default_uamor);
 481 }
 482
 483 static int pkey_set(struct task_struct *target, const struct user_regset *regset,
 484                     unsigned int pos, unsigned int count, const void *kbuf,
 485                     const void __user *ubuf)
 486 {
 487         u64 new_amr;
 488         int ret;
 489
 490         if (!arch_pkeys_enabled())
 491                 return -ENODEV;
 492
 493         /* Only the AMR can be set from userspace */
 494         if (pos != 0 || count != sizeof(new_amr))
 495                 return -EINVAL;
 496
 497         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 498                                  &new_amr, 0, sizeof(new_amr));
 499         if (ret)
 500                 return ret;
 501
 502         /*
 503          * UAMOR determines which bits of the AMR can be set from userspace.
 504          * UAMOR value 0b11 indicates that the AMR value can be modified
 505          * from userspace. If the kernel is using a specific key, we avoid
 506          * userspace modifying the AMR value for that key by masking them
 507          * via UAMOR 0b00.
 508          *
 509          * Pick the AMR values for the keys that kernel is using. This
 510          * will be indicated by the ~default_uamor bits.
 511          */
 512         target->thread.regs->amr = (new_amr & default_uamor) |
 513                 (target->thread.regs->amr & ~default_uamor);
 514
 515         return 0;
 516 }
 517 #endif /* CONFIG_PPC_MEM_KEYS */
 518
 519 static const struct user_regset native_regsets[] = {
 520         [REGSET_GPR] = {
 521                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 522                 .size = sizeof(long), .align = sizeof(long),
 523                 .regset_get = gpr_get, .set = gpr_set
 524         },
 525 #ifdef CONFIG_PPC_FPU_REGS
 526         [REGSET_FPR] = {
 527                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 528                 .size = sizeof(double), .align = sizeof(double),
 529                 .regset_get = fpr_get, .set = fpr_set
 530         },
 531 #endif
 532 #ifdef CONFIG_ALTIVEC
 533         [REGSET_VMX] = {
 534                 .core_note_type = NT_PPC_VMX, .n = 34,
 535                 .size = sizeof(vector128), .align = sizeof(vector128),
 536                 .active = vr_active, .regset_get = vr_get, .set = vr_set
 537         },
 538 #endif
 539 #ifdef CONFIG_VSX
 540         [REGSET_VSX] = {
 541                 .core_note_type = NT_PPC_VSX, .n = 32,
 542                 .size = sizeof(double), .align = sizeof(double),
 543                 .active = vsr_active, .regset_get = vsr_get, .set = vsr_set
 544         },
 545 #endif
 546 #ifdef CONFIG_SPE
 547         [REGSET_SPE] = {
 548                 .core_note_type = NT_PPC_SPE, .n = 35,
 549                 .size = sizeof(u32), .align = sizeof(u32),
 550                 .active = evr_active, .regset_get = evr_get, .set = evr_set
 551         },
 552 #endif
 553 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 554         [REGSET_TM_CGPR] = {
 555                 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
 556                 .size = sizeof(long), .align = sizeof(long),
 557                 .active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set
 558         },
 559         [REGSET_TM_CFPR] = {
 560                 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
 561                 .size = sizeof(double), .align = sizeof(double),
 562                 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
 563         },
 564         [REGSET_TM_CVMX] = {
 565                 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
 566                 .size = sizeof(vector128), .align = sizeof(vector128),
 567                 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
 568         },
 569         [REGSET_TM_CVSX] = {
 570                 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
 571                 .size = sizeof(double), .align = sizeof(double),
 572                 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
 573         },
 574         [REGSET_TM_SPR] = {
 575                 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
 576                 .size = sizeof(u64), .align = sizeof(u64),
 577                 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
 578         },
 579         [REGSET_TM_CTAR] = {
 580                 .core_note_type = NT_PPC_TM_CTAR, .n = 1,
 581                 .size = sizeof(u64), .align = sizeof(u64),
 582                 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
 583         },
 584         [REGSET_TM_CPPR] = {
 585                 .core_note_type = NT_PPC_TM_CPPR, .n = 1,
 586                 .size = sizeof(u64), .align = sizeof(u64),
 587                 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
 588         },
 589         [REGSET_TM_CDSCR] = {
 590                 .core_note_type = NT_PPC_TM_CDSCR, .n = 1,
 591                 .size = sizeof(u64), .align = sizeof(u64),
 592                 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
 593         },
 594 #endif
 595 #ifdef CONFIG_PPC64
 596         [REGSET_PPR] = {
 597                 .core_note_type = NT_PPC_PPR, .n = 1,
 598                 .size = sizeof(u64), .align = sizeof(u64),
 599                 .regset_get = ppr_get, .set = ppr_set
 600         },
 601         [REGSET_DSCR] = {
 602                 .core_note_type = NT_PPC_DSCR, .n = 1,
 603                 .size = sizeof(u64), .align = sizeof(u64),
 604                 .regset_get = dscr_get, .set = dscr_set
 605         },
 606 #endif
 607 #ifdef CONFIG_PPC_BOOK3S_64
 608         [REGSET_TAR] = {
 609                 .core_note_type = NT_PPC_TAR, .n = 1,
 610                 .size = sizeof(u64), .align = sizeof(u64),
 611                 .regset_get = tar_get, .set = tar_set
 612         },
 613         [REGSET_EBB] = {
 614                 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
 615                 .size = sizeof(u64), .align = sizeof(u64),
 616                 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set
 617         },
 618         [REGSET_PMR] = {
 619                 .core_note_type = NT_PPC_PMU, .n = ELF_NPMU,
 620                 .size = sizeof(u64), .align = sizeof(u64),
 621                 .active = pmu_active, .regset_get = pmu_get, .set = pmu_set
 622         },
 623 #endif
 624 #ifdef CONFIG_PPC_MEM_KEYS
 625         [REGSET_PKEY] = {
 626                 .core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY,
 627                 .size = sizeof(u64), .align = sizeof(u64),
 628                 .active = pkey_active, .regset_get = pkey_get, .set = pkey_set
 629         },
 630 #endif
 631 };
 632
 633 const struct user_regset_view user_ppc_native_view = {
 634         .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
 635         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
 636 };
 637
 638 #include <linux/compat.h>
 639
 640 int gpr32_get_common(struct task_struct *target,
 641                      const struct user_regset *regset,
 642                      struct membuf to, unsigned long *regs)
 643 {
 644         int i;
 645
 646         for (i = 0; i < PT_MSR; i++)
 647                 membuf_store(&to, (u32)regs[i]);
 648         membuf_store(&to, (u32)get_user_msr(target));
 649         for (i++ ; i < PT_REGS_COUNT; i++)
 650                 membuf_store(&to, (u32)regs[i]);
 651         return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32));
 652 }
 653
 654 int gpr32_set_common(struct task_struct *target,
 655                      const struct user_regset *regset,
 656                      unsigned int pos, unsigned int count,
 657                      const void *kbuf, const void __user *ubuf,
 658                      unsigned long *regs)
 659 {
 660         const compat_ulong_t *k = kbuf;
 661         const compat_ulong_t __user *u = ubuf;
 662         compat_ulong_t reg;
 663
 664         pos /= sizeof(reg);
 665         count /= sizeof(reg);
 666
 667         if (kbuf)
 668                 for (; count > 0 && pos < PT_MSR; --count)
 669                         regs[pos++] = *k++;
 670         else
 671                 for (; count > 0 && pos < PT_MSR; --count) {
 672                         if (__get_user(reg, u++))
 673                                 return -EFAULT;
 674                         regs[pos++] = reg;
 675                 }
 676
 677
 678         if (count > 0 && pos == PT_MSR) {
 679                 if (kbuf)
 680                         reg = *k++;
 681                 else if (__get_user(reg, u++))
 682                         return -EFAULT;
 683                 set_user_msr(target, reg);
 684                 ++pos;
 685                 --count;
 686         }
 687
 688         if (kbuf) {
 689                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
 690                         regs[pos++] = *k++;
 691                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 692                         ++k;
 693         } else {
 694                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
 695                         if (__get_user(reg, u++))
 696                                 return -EFAULT;
 697                         regs[pos++] = reg;
 698                 }
 699                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 700                         if (__get_user(reg, u++))
 701                                 return -EFAULT;
 702         }
 703
 704         if (count > 0 && pos == PT_TRAP) {
 705                 if (kbuf)
 706                         reg = *k++;
 707                 else if (__get_user(reg, u++))
 708                         return -EFAULT;
 709                 set_user_trap(target, reg);
 710                 ++pos;
 711                 --count;
 712         }
 713
 714         kbuf = k;
 715         ubuf = u;
 716         pos *= sizeof(reg);
 717         count *= sizeof(reg);
 718         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 719                                          (PT_TRAP + 1) * sizeof(reg), -1);
 720 }
 721
 722 static int gpr32_get(struct task_struct *target,
 723                      const struct user_regset *regset,
 724                      struct membuf to)
 725 {
 726         int i;
 727
 728         if (target->thread.regs == NULL)
 729                 return -EIO;
 730
 731         if (!FULL_REGS(target->thread.regs)) {
 732                 /*
 733                  * We have a partial register set.
 734                  * Fill 14-31 with bogus values.
 735                  */
 736                 for (i = 14; i < 32; i++)
 737                         target->thread.regs->gpr[i] = NV_REG_POISON;
 738         }
 739         return gpr32_get_common(target, regset, to,
 740                         &target->thread.regs->gpr[0]);
 741 }
 742
 743 static int gpr32_set(struct task_struct *target,
 744                      const struct user_regset *regset,
 745                      unsigned int pos, unsigned int count,
 746                      const void *kbuf, const void __user *ubuf)
 747 {
 748         if (target->thread.regs == NULL)
 749                 return -EIO;
 750
 751         CHECK_FULL_REGS(target->thread.regs);
 752         return gpr32_set_common(target, regset, pos, count, kbuf, ubuf,
 753                         &target->thread.regs->gpr[0]);
 754 }
 755
 756 /*
 757  * These are the regset flavors matching the CONFIG_PPC32 native set.
 758  */
 759 static const struct user_regset compat_regsets[] = {
 760         [REGSET_GPR] = {
 761                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 762                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
 763                 .regset_get = gpr32_get, .set = gpr32_set
 764         },
 765         [REGSET_FPR] = {
 766                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 767                 .size = sizeof(double), .align = sizeof(double),
 768                 .regset_get = fpr_get, .set = fpr_set
 769         },
 770 #ifdef CONFIG_ALTIVEC
 771         [REGSET_VMX] = {
 772                 .core_note_type = NT_PPC_VMX, .n = 34,
 773                 .size = sizeof(vector128), .align = sizeof(vector128),
 774                 .active = vr_active, .regset_get = vr_get, .set = vr_set
 775         },
 776 #endif
 777 #ifdef CONFIG_SPE
 778         [REGSET_SPE] = {
 779                 .core_note_type = NT_PPC_SPE, .n = 35,
 780                 .size = sizeof(u32), .align = sizeof(u32),
 781                 .active = evr_active, .regset_get = evr_get, .set = evr_set
 782         },
 783 #endif
 784 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 785         [REGSET_TM_CGPR] = {
 786                 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
 787                 .size = sizeof(long), .align = sizeof(long),
 788                 .active = tm_cgpr_active,
 789                 .regset_get = tm_cgpr32_get, .set = tm_cgpr32_set
 790         },
 791         [REGSET_TM_CFPR] = {
 792                 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
 793                 .size = sizeof(double), .align = sizeof(double),
 794                 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
 795         },
 796         [REGSET_TM_CVMX] = {
 797                 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
 798                 .size = sizeof(vector128), .align = sizeof(vector128),
 799                 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
 800         },
 801         [REGSET_TM_CVSX] = {
 802                 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
 803                 .size = sizeof(double), .align = sizeof(double),
 804                 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
 805         },
 806         [REGSET_TM_SPR] = {
 807                 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
 808                 .size = sizeof(u64), .align = sizeof(u64),
 809                 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
 810         },
 811         [REGSET_TM_CTAR] = {
 812                 .core_note_type = NT_PPC_TM_CTAR, .n = 1,
 813                 .size = sizeof(u64), .align = sizeof(u64),
 814                 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
 815         },
 816         [REGSET_TM_CPPR] = {
 817                 .core_note_type = NT_PPC_TM_CPPR, .n = 1,
 818                 .size = sizeof(u64), .align = sizeof(u64),
 819                 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
 820         },
 821         [REGSET_TM_CDSCR] = {
 822                 .core_note_type = NT_PPC_TM_CDSCR, .n = 1,
 823                 .size = sizeof(u64), .align = sizeof(u64),
 824                 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
 825         },
 826 #endif
 827 #ifdef CONFIG_PPC64
 828         [REGSET_PPR] = {
 829                 .core_note_type = NT_PPC_PPR, .n = 1,
 830                 .size = sizeof(u64), .align = sizeof(u64),
 831                 .regset_get = ppr_get, .set = ppr_set
 832         },
 833         [REGSET_DSCR] = {
 834                 .core_note_type = NT_PPC_DSCR, .n = 1,
 835                 .size = sizeof(u64), .align = sizeof(u64),
 836                 .regset_get = dscr_get, .set = dscr_set
 837         },
 838 #endif
 839 #ifdef CONFIG_PPC_BOOK3S_64
 840         [REGSET_TAR] = {
 841                 .core_note_type = NT_PPC_TAR, .n = 1,
 842                 .size = sizeof(u64), .align = sizeof(u64),
 843                 .regset_get = tar_get, .set = tar_set
 844         },
 845         [REGSET_EBB] = {
 846                 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
 847                 .size = sizeof(u64), .align = sizeof(u64),
 848                 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set
 849         },
 850 #endif
 851 };
 852
 853 static const struct user_regset_view user_ppc_compat_view = {
 854         .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
 855         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
 856 };
 857
 858 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 859 {
 860         if (IS_ENABLED(CONFIG_PPC64) && test_tsk_thread_flag(task, TIF_32BIT))
 861                 return &user_ppc_compat_view;
 862         return &user_ppc_native_view;
 863 }