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, ®, 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, ®, 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 [REGSET_FPR] = { 526 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 527 .size = sizeof(double), .align = sizeof(double), 528 .regset_get = fpr_get, .set = fpr_set 529 }, 530 #ifdef CONFIG_ALTIVEC 531 [REGSET_VMX] = { 532 .core_note_type = NT_PPC_VMX, .n = 34, 533 .size = sizeof(vector128), .align = sizeof(vector128), 534 .active = vr_active, .regset_get = vr_get, .set = vr_set 535 }, 536 #endif 537 #ifdef CONFIG_VSX 538 [REGSET_VSX] = { 539 .core_note_type = NT_PPC_VSX, .n = 32, 540 .size = sizeof(double), .align = sizeof(double), 541 .active = vsr_active, .regset_get = vsr_get, .set = vsr_set 542 }, 543 #endif 544 #ifdef CONFIG_SPE 545 [REGSET_SPE] = { 546 .core_note_type = NT_PPC_SPE, .n = 35, 547 .size = sizeof(u32), .align = sizeof(u32), 548 .active = evr_active, .regset_get = evr_get, .set = evr_set 549 }, 550 #endif 551 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 552 [REGSET_TM_CGPR] = { 553 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, 554 .size = sizeof(long), .align = sizeof(long), 555 .active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set 556 }, 557 [REGSET_TM_CFPR] = { 558 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, 559 .size = sizeof(double), .align = sizeof(double), 560 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set 561 }, 562 [REGSET_TM_CVMX] = { 563 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, 564 .size = sizeof(vector128), .align = sizeof(vector128), 565 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set 566 }, 567 [REGSET_TM_CVSX] = { 568 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, 569 .size = sizeof(double), .align = sizeof(double), 570 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set 571 }, 572 [REGSET_TM_SPR] = { 573 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, 574 .size = sizeof(u64), .align = sizeof(u64), 575 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set 576 }, 577 [REGSET_TM_CTAR] = { 578 .core_note_type = NT_PPC_TM_CTAR, .n = 1, 579 .size = sizeof(u64), .align = sizeof(u64), 580 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set 581 }, 582 [REGSET_TM_CPPR] = { 583 .core_note_type = NT_PPC_TM_CPPR, .n = 1, 584 .size = sizeof(u64), .align = sizeof(u64), 585 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set 586 }, 587 [REGSET_TM_CDSCR] = { 588 .core_note_type = NT_PPC_TM_CDSCR, .n = 1, 589 .size = sizeof(u64), .align = sizeof(u64), 590 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set 591 }, 592 #endif 593 #ifdef CONFIG_PPC64 594 [REGSET_PPR] = { 595 .core_note_type = NT_PPC_PPR, .n = 1, 596 .size = sizeof(u64), .align = sizeof(u64), 597 .regset_get = ppr_get, .set = ppr_set 598 }, 599 [REGSET_DSCR] = { 600 .core_note_type = NT_PPC_DSCR, .n = 1, 601 .size = sizeof(u64), .align = sizeof(u64), 602 .regset_get = dscr_get, .set = dscr_set 603 }, 604 #endif 605 #ifdef CONFIG_PPC_BOOK3S_64 606 [REGSET_TAR] = { 607 .core_note_type = NT_PPC_TAR, .n = 1, 608 .size = sizeof(u64), .align = sizeof(u64), 609 .regset_get = tar_get, .set = tar_set 610 }, 611 [REGSET_EBB] = { 612 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, 613 .size = sizeof(u64), .align = sizeof(u64), 614 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set 615 }, 616 [REGSET_PMR] = { 617 .core_note_type = NT_PPC_PMU, .n = ELF_NPMU, 618 .size = sizeof(u64), .align = sizeof(u64), 619 .active = pmu_active, .regset_get = pmu_get, .set = pmu_set 620 }, 621 #endif 622 #ifdef CONFIG_PPC_MEM_KEYS 623 [REGSET_PKEY] = { 624 .core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY, 625 .size = sizeof(u64), .align = sizeof(u64), 626 .active = pkey_active, .regset_get = pkey_get, .set = pkey_set 627 }, 628 #endif 629 }; 630 631 const struct user_regset_view user_ppc_native_view = { 632 .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, 633 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) 634 }; 635 636 #include <linux/compat.h> 637 638 int gpr32_get_common(struct task_struct *target, 639 const struct user_regset *regset, 640 struct membuf to, unsigned long *regs) 641 { 642 int i; 643 644 for (i = 0; i < PT_MSR; i++) 645 membuf_store(&to, (u32)regs[i]); 646 membuf_store(&to, (u32)get_user_msr(target)); 647 for (i++ ; i < PT_REGS_COUNT; i++) 648 membuf_store(&to, (u32)regs[i]); 649 return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32)); 650 } 651 652 int gpr32_set_common(struct task_struct *target, 653 const struct user_regset *regset, 654 unsigned int pos, unsigned int count, 655 const void *kbuf, const void __user *ubuf, 656 unsigned long *regs) 657 { 658 const compat_ulong_t *k = kbuf; 659 const compat_ulong_t __user *u = ubuf; 660 compat_ulong_t reg; 661 662 pos /= sizeof(reg); 663 count /= sizeof(reg); 664 665 if (kbuf) 666 for (; count > 0 && pos < PT_MSR; --count) 667 regs[pos++] = *k++; 668 else 669 for (; count > 0 && pos < PT_MSR; --count) { 670 if (__get_user(reg, u++)) 671 return -EFAULT; 672 regs[pos++] = reg; 673 } 674 675 676 if (count > 0 && pos == PT_MSR) { 677 if (kbuf) 678 reg = *k++; 679 else if (__get_user(reg, u++)) 680 return -EFAULT; 681 set_user_msr(target, reg); 682 ++pos; 683 --count; 684 } 685 686 if (kbuf) { 687 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) 688 regs[pos++] = *k++; 689 for (; count > 0 && pos < PT_TRAP; --count, ++pos) 690 ++k; 691 } else { 692 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) { 693 if (__get_user(reg, u++)) 694 return -EFAULT; 695 regs[pos++] = reg; 696 } 697 for (; count > 0 && pos < PT_TRAP; --count, ++pos) 698 if (__get_user(reg, u++)) 699 return -EFAULT; 700 } 701 702 if (count > 0 && pos == PT_TRAP) { 703 if (kbuf) 704 reg = *k++; 705 else if (__get_user(reg, u++)) 706 return -EFAULT; 707 set_user_trap(target, reg); 708 ++pos; 709 --count; 710 } 711 712 kbuf = k; 713 ubuf = u; 714 pos *= sizeof(reg); 715 count *= sizeof(reg); 716 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 717 (PT_TRAP + 1) * sizeof(reg), -1); 718 } 719 720 static int gpr32_get(struct task_struct *target, 721 const struct user_regset *regset, 722 struct membuf to) 723 { 724 int i; 725 726 if (target->thread.regs == NULL) 727 return -EIO; 728 729 if (!FULL_REGS(target->thread.regs)) { 730 /* 731 * We have a partial register set. 732 * Fill 14-31 with bogus values. 733 */ 734 for (i = 14; i < 32; i++) 735 target->thread.regs->gpr[i] = NV_REG_POISON; 736 } 737 return gpr32_get_common(target, regset, to, 738 &target->thread.regs->gpr[0]); 739 } 740 741 static int gpr32_set(struct task_struct *target, 742 const struct user_regset *regset, 743 unsigned int pos, unsigned int count, 744 const void *kbuf, const void __user *ubuf) 745 { 746 if (target->thread.regs == NULL) 747 return -EIO; 748 749 CHECK_FULL_REGS(target->thread.regs); 750 return gpr32_set_common(target, regset, pos, count, kbuf, ubuf, 751 &target->thread.regs->gpr[0]); 752 } 753 754 /* 755 * These are the regset flavors matching the CONFIG_PPC32 native set. 756 */ 757 static const struct user_regset compat_regsets[] = { 758 [REGSET_GPR] = { 759 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 760 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t), 761 .regset_get = gpr32_get, .set = gpr32_set 762 }, 763 [REGSET_FPR] = { 764 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 765 .size = sizeof(double), .align = sizeof(double), 766 .regset_get = fpr_get, .set = fpr_set 767 }, 768 #ifdef CONFIG_ALTIVEC 769 [REGSET_VMX] = { 770 .core_note_type = NT_PPC_VMX, .n = 34, 771 .size = sizeof(vector128), .align = sizeof(vector128), 772 .active = vr_active, .regset_get = vr_get, .set = vr_set 773 }, 774 #endif 775 #ifdef CONFIG_SPE 776 [REGSET_SPE] = { 777 .core_note_type = NT_PPC_SPE, .n = 35, 778 .size = sizeof(u32), .align = sizeof(u32), 779 .active = evr_active, .regset_get = evr_get, .set = evr_set 780 }, 781 #endif 782 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 783 [REGSET_TM_CGPR] = { 784 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, 785 .size = sizeof(long), .align = sizeof(long), 786 .active = tm_cgpr_active, 787 .regset_get = tm_cgpr32_get, .set = tm_cgpr32_set 788 }, 789 [REGSET_TM_CFPR] = { 790 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, 791 .size = sizeof(double), .align = sizeof(double), 792 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set 793 }, 794 [REGSET_TM_CVMX] = { 795 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, 796 .size = sizeof(vector128), .align = sizeof(vector128), 797 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set 798 }, 799 [REGSET_TM_CVSX] = { 800 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, 801 .size = sizeof(double), .align = sizeof(double), 802 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set 803 }, 804 [REGSET_TM_SPR] = { 805 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, 806 .size = sizeof(u64), .align = sizeof(u64), 807 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set 808 }, 809 [REGSET_TM_CTAR] = { 810 .core_note_type = NT_PPC_TM_CTAR, .n = 1, 811 .size = sizeof(u64), .align = sizeof(u64), 812 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set 813 }, 814 [REGSET_TM_CPPR] = { 815 .core_note_type = NT_PPC_TM_CPPR, .n = 1, 816 .size = sizeof(u64), .align = sizeof(u64), 817 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set 818 }, 819 [REGSET_TM_CDSCR] = { 820 .core_note_type = NT_PPC_TM_CDSCR, .n = 1, 821 .size = sizeof(u64), .align = sizeof(u64), 822 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set 823 }, 824 #endif 825 #ifdef CONFIG_PPC64 826 [REGSET_PPR] = { 827 .core_note_type = NT_PPC_PPR, .n = 1, 828 .size = sizeof(u64), .align = sizeof(u64), 829 .regset_get = ppr_get, .set = ppr_set 830 }, 831 [REGSET_DSCR] = { 832 .core_note_type = NT_PPC_DSCR, .n = 1, 833 .size = sizeof(u64), .align = sizeof(u64), 834 .regset_get = dscr_get, .set = dscr_set 835 }, 836 #endif 837 #ifdef CONFIG_PPC_BOOK3S_64 838 [REGSET_TAR] = { 839 .core_note_type = NT_PPC_TAR, .n = 1, 840 .size = sizeof(u64), .align = sizeof(u64), 841 .regset_get = tar_get, .set = tar_set 842 }, 843 [REGSET_EBB] = { 844 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, 845 .size = sizeof(u64), .align = sizeof(u64), 846 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set 847 }, 848 #endif 849 }; 850 851 static const struct user_regset_view user_ppc_compat_view = { 852 .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI, 853 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets) 854 }; 855 856 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 857 { 858 if (IS_ENABLED(CONFIG_PPC64) && test_tsk_thread_flag(task, TIF_32BIT)) 859 return &user_ppc_compat_view; 860 return &user_ppc_native_view; 861 } 862