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 10struct 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 22static 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 */ 79int 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 */ 95const 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 109static unsigned long get_user_msr(struct task_struct *task) 110{ 111 return task->thread.regs->msr | task->thread.fpexc_mode; 112} 113 114static __always_inline int set_user_msr(struct task_struct *task, unsigned long msr) 115{ 116 unsigned long newmsr = (task->thread.regs->msr & ~MSR_DEBUGCHANGE) | 117 (msr & MSR_DEBUGCHANGE); 118 regs_set_return_msr(task->thread.regs, newmsr); 119 return 0; 120} 121 122#ifdef CONFIG_PPC64 123static int get_user_dscr(struct task_struct *task, unsigned long *data) 124{ 125 *data = task->thread.dscr; 126 return 0; 127} 128 129static int set_user_dscr(struct task_struct *task, unsigned long dscr) 130{ 131 task->thread.dscr = dscr; 132 task->thread.dscr_inherit = 1; 133 return 0; 134} 135#else 136static int get_user_dscr(struct task_struct *task, unsigned long *data) 137{ 138 return -EIO; 139} 140 141static int set_user_dscr(struct task_struct *task, unsigned long dscr) 142{ 143 return -EIO; 144} 145#endif 146 147/* 148 * We prevent mucking around with the reserved area of trap 149 * which are used internally by the kernel. 150 */ 151static __always_inline int set_user_trap(struct task_struct *task, unsigned long trap) 152{ 153 set_trap(task->thread.regs, trap); 154 return 0; 155} 156 157/* 158 * Get contents of register REGNO in task TASK. 159 */ 160int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data) 161{ 162 unsigned int regs_max; 163 164 if (task->thread.regs == NULL || !data) 165 return -EIO; 166 167 if (regno == PT_MSR) { 168 *data = get_user_msr(task); 169 return 0; 170 } 171 172 if (regno == PT_DSCR) 173 return get_user_dscr(task, data); 174 175 /* 176 * softe copies paca->irq_soft_mask variable state. Since irq_soft_mask is 177 * no more used as a flag, lets force usr to always see the softe value as 1 178 * which means interrupts are not soft disabled. 179 */ 180 if (IS_ENABLED(CONFIG_PPC64) && regno == PT_SOFTE) { 181 *data = 1; 182 return 0; 183 } 184 185 regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long); 186 if (regno < regs_max) { 187 regno = array_index_nospec(regno, regs_max); 188 *data = ((unsigned long *)task->thread.regs)[regno]; 189 return 0; 190 } 191 192 return -EIO; 193} 194 195/* 196 * Write contents of register REGNO in task TASK. 197 */ 198int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data) 199{ 200 if (task->thread.regs == NULL) 201 return -EIO; 202 203 if (regno == PT_MSR) 204 return set_user_msr(task, data); 205 if (regno == PT_TRAP) 206 return set_user_trap(task, data); 207 if (regno == PT_DSCR) 208 return set_user_dscr(task, data); 209 210 if (regno <= PT_MAX_PUT_REG) { 211 regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1); 212 ((unsigned long *)task->thread.regs)[regno] = data; 213 return 0; 214 } 215 return -EIO; 216} 217 218static int gpr_get(struct task_struct *target, const struct user_regset *regset, 219 struct membuf to) 220{ 221 struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr)); 222#ifdef CONFIG_PPC64 223 struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe)); 224#endif 225 if (target->thread.regs == NULL) 226 return -EIO; 227 228 membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs)); 229 230 membuf_store(&to_msr, get_user_msr(target)); 231#ifdef CONFIG_PPC64 232 membuf_store(&to_softe, 0x1ul); 233#endif 234 return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) - 235 sizeof(struct user_pt_regs)); 236} 237 238static int gpr_set(struct task_struct *target, const struct user_regset *regset, 239 unsigned int pos, unsigned int count, const void *kbuf, 240 const void __user *ubuf) 241{ 242 unsigned long reg; 243 int ret; 244 245 if (target->thread.regs == NULL) 246 return -EIO; 247 248 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 249 target->thread.regs, 250 0, PT_MSR * sizeof(reg)); 251 252 if (!ret && count > 0) { 253 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®, 254 PT_MSR * sizeof(reg), 255 (PT_MSR + 1) * sizeof(reg)); 256 if (!ret) 257 ret = set_user_msr(target, reg); 258 } 259 260 BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) != 261 offsetof(struct pt_regs, msr) + sizeof(long)); 262 263 if (!ret) 264 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 265 &target->thread.regs->orig_gpr3, 266 PT_ORIG_R3 * sizeof(reg), 267 (PT_MAX_PUT_REG + 1) * sizeof(reg)); 268 269 if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret) 270 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 271 (PT_MAX_PUT_REG + 1) * sizeof(reg), 272 PT_TRAP * sizeof(reg)); 273 274 if (!ret && count > 0) { 275 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®, 276 PT_TRAP * sizeof(reg), 277 (PT_TRAP + 1) * sizeof(reg)); 278 if (!ret) 279 ret = set_user_trap(target, reg); 280 } 281 282 if (!ret) 283 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 284 (PT_TRAP + 1) * sizeof(reg), -1); 285 286 return ret; 287} 288 289#ifdef CONFIG_PPC64 290static int ppr_get(struct task_struct *target, const struct user_regset *regset, 291 struct membuf to) 292{ 293 if (!target->thread.regs) 294 return -EINVAL; 295 296 return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64)); 297} 298 299static int ppr_set(struct task_struct *target, const struct user_regset *regset, 300 unsigned int pos, unsigned int count, const void *kbuf, 301 const void __user *ubuf) 302{ 303 if (!target->thread.regs) 304 return -EINVAL; 305 306 return user_regset_copyin(&pos, &count, &kbuf, &ubuf, 307 &target->thread.regs->ppr, 0, sizeof(u64)); 308} 309 310static int dscr_get(struct task_struct *target, const struct user_regset *regset, 311 struct membuf to) 312{ 313 return membuf_write(&to, &target->thread.dscr, sizeof(u64)); 314} 315static int dscr_set(struct task_struct *target, const struct user_regset *regset, 316 unsigned int pos, unsigned int count, const void *kbuf, 317 const void __user *ubuf) 318{ 319 return user_regset_copyin(&pos, &count, &kbuf, &ubuf, 320 &target->thread.dscr, 0, sizeof(u64)); 321} 322#endif 323#ifdef CONFIG_PPC_BOOK3S_64 324static int tar_get(struct task_struct *target, const struct user_regset *regset, 325 struct membuf to) 326{ 327 return membuf_write(&to, &target->thread.tar, sizeof(u64)); 328} 329static int tar_set(struct task_struct *target, const struct user_regset *regset, 330 unsigned int pos, unsigned int count, const void *kbuf, 331 const void __user *ubuf) 332{ 333 return user_regset_copyin(&pos, &count, &kbuf, &ubuf, 334 &target->thread.tar, 0, sizeof(u64)); 335} 336 337static int ebb_active(struct task_struct *target, const struct user_regset *regset) 338{ 339 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 340 return -ENODEV; 341 342 if (target->thread.used_ebb) 343 return regset->n; 344 345 return 0; 346} 347 348static int ebb_get(struct task_struct *target, const struct user_regset *regset, 349 struct membuf to) 350{ 351 /* Build tests */ 352 BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr)); 353 BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr)); 354 355 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 356 return -ENODEV; 357 358 if (!target->thread.used_ebb) 359 return -ENODATA; 360 361 return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long)); 362} 363 364static int ebb_set(struct task_struct *target, const struct user_regset *regset, 365 unsigned int pos, unsigned int count, const void *kbuf, 366 const void __user *ubuf) 367{ 368 int ret = 0; 369 370 /* Build tests */ 371 BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr)); 372 BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr)); 373 374 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 375 return -ENODEV; 376 377 if (target->thread.used_ebb) 378 return -ENODATA; 379 380 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr, 381 0, sizeof(unsigned long)); 382 383 if (!ret) 384 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 385 &target->thread.ebbhr, sizeof(unsigned long), 386 2 * sizeof(unsigned long)); 387 388 if (!ret) 389 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 390 &target->thread.bescr, 2 * sizeof(unsigned long), 391 3 * sizeof(unsigned long)); 392 393 return ret; 394} 395static int pmu_active(struct task_struct *target, const struct user_regset *regset) 396{ 397 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 398 return -ENODEV; 399 400 return regset->n; 401} 402 403static int pmu_get(struct task_struct *target, const struct user_regset *regset, 404 struct membuf to) 405{ 406 /* Build tests */ 407 BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar)); 408 BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier)); 409 BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2)); 410 BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0)); 411 412 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 413 return -ENODEV; 414 415 return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long)); 416} 417 418static int pmu_set(struct task_struct *target, const struct user_regset *regset, 419 unsigned int pos, unsigned int count, const void *kbuf, 420 const void __user *ubuf) 421{ 422 int ret = 0; 423 424 /* Build tests */ 425 BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar)); 426 BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier)); 427 BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2)); 428 BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0)); 429 430 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 431 return -ENODEV; 432 433 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar, 434 0, sizeof(unsigned long)); 435 436 if (!ret) 437 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 438 &target->thread.sdar, sizeof(unsigned long), 439 2 * sizeof(unsigned long)); 440 441 if (!ret) 442 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 443 &target->thread.sier, 2 * sizeof(unsigned long), 444 3 * sizeof(unsigned long)); 445 446 if (!ret) 447 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 448 &target->thread.mmcr2, 3 * sizeof(unsigned long), 449 4 * sizeof(unsigned long)); 450 451 if (!ret) 452 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 453 &target->thread.mmcr0, 4 * sizeof(unsigned long), 454 5 * sizeof(unsigned long)); 455 return ret; 456} 457 458static int dexcr_active(struct task_struct *target, const struct user_regset *regset) 459{ 460 if (!cpu_has_feature(CPU_FTR_ARCH_31)) 461 return -ENODEV; 462 463 return regset->n; 464} 465 466static int dexcr_get(struct task_struct *target, const struct user_regset *regset, 467 struct membuf to) 468{ 469 if (!cpu_has_feature(CPU_FTR_ARCH_31)) 470 return -ENODEV; 471 472 /* 473 * The DEXCR is currently static across all CPUs, so we don't 474 * store the target's value anywhere, but the static value 475 * will also be correct. 476 */ 477 membuf_store(&to, (u64)lower_32_bits(DEXCR_INIT)); 478 479 /* 480 * Technically the HDEXCR is per-cpu, but a hypervisor can't reasonably 481 * change it between CPUs of the same guest. 482 */ 483 return membuf_store(&to, (u64)lower_32_bits(mfspr(SPRN_HDEXCR_RO))); 484} 485 486#ifdef CONFIG_CHECKPOINT_RESTORE 487static int hashkeyr_active(struct task_struct *target, const struct user_regset *regset) 488{ 489 if (!cpu_has_feature(CPU_FTR_ARCH_31)) 490 return -ENODEV; 491 492 return regset->n; 493} 494 495static int hashkeyr_get(struct task_struct *target, const struct user_regset *regset, 496 struct membuf to) 497{ 498 if (!cpu_has_feature(CPU_FTR_ARCH_31)) 499 return -ENODEV; 500 501 return membuf_store(&to, target->thread.hashkeyr); 502} 503 504static int hashkeyr_set(struct task_struct *target, const struct user_regset *regset, 505 unsigned int pos, unsigned int count, const void *kbuf, 506 const void __user *ubuf) 507{ 508 if (!cpu_has_feature(CPU_FTR_ARCH_31)) 509 return -ENODEV; 510 511 return user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.hashkeyr, 512 0, sizeof(unsigned long)); 513} 514#endif /* CONFIG_CHECKPOINT_RESTORE */ 515#endif /* CONFIG_PPC_BOOK3S_64 */ 516 517#ifdef CONFIG_PPC_MEM_KEYS 518static int pkey_active(struct task_struct *target, const struct user_regset *regset) 519{ 520 if (!arch_pkeys_enabled()) 521 return -ENODEV; 522 523 return regset->n; 524} 525 526static int pkey_get(struct task_struct *target, const struct user_regset *regset, 527 struct membuf to) 528{ 529 530 if (!arch_pkeys_enabled()) 531 return -ENODEV; 532 533 membuf_store(&to, target->thread.regs->amr); 534 membuf_store(&to, target->thread.regs->iamr); 535 return membuf_store(&to, default_uamor); 536} 537 538static int pkey_set(struct task_struct *target, const struct user_regset *regset, 539 unsigned int pos, unsigned int count, const void *kbuf, 540 const void __user *ubuf) 541{ 542 u64 new_amr; 543 int ret; 544 545 if (!arch_pkeys_enabled()) 546 return -ENODEV; 547 548 /* Only the AMR can be set from userspace */ 549 if (pos != 0 || count != sizeof(new_amr)) 550 return -EINVAL; 551 552 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 553 &new_amr, 0, sizeof(new_amr)); 554 if (ret) 555 return ret; 556 557 /* 558 * UAMOR determines which bits of the AMR can be set from userspace. 559 * UAMOR value 0b11 indicates that the AMR value can be modified 560 * from userspace. If the kernel is using a specific key, we avoid 561 * userspace modifying the AMR value for that key by masking them 562 * via UAMOR 0b00. 563 * 564 * Pick the AMR values for the keys that kernel is using. This 565 * will be indicated by the ~default_uamor bits. 566 */ 567 target->thread.regs->amr = (new_amr & default_uamor) | 568 (target->thread.regs->amr & ~default_uamor); 569 570 return 0; 571} 572#endif /* CONFIG_PPC_MEM_KEYS */ 573 574static const struct user_regset native_regsets[] = { 575 [REGSET_GPR] = { 576 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 577 .size = sizeof(long), .align = sizeof(long), 578 .regset_get = gpr_get, .set = gpr_set 579 }, 580 [REGSET_FPR] = { 581 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 582 .size = sizeof(double), .align = sizeof(double), 583 .regset_get = fpr_get, .set = fpr_set 584 }, 585#ifdef CONFIG_ALTIVEC 586 [REGSET_VMX] = { 587 .core_note_type = NT_PPC_VMX, .n = 34, 588 .size = sizeof(vector128), .align = sizeof(vector128), 589 .active = vr_active, .regset_get = vr_get, .set = vr_set 590 }, 591#endif 592#ifdef CONFIG_VSX 593 [REGSET_VSX] = { 594 .core_note_type = NT_PPC_VSX, .n = 32, 595 .size = sizeof(double), .align = sizeof(double), 596 .active = vsr_active, .regset_get = vsr_get, .set = vsr_set 597 }, 598#endif 599#ifdef CONFIG_SPE 600 [REGSET_SPE] = { 601 .core_note_type = NT_PPC_SPE, .n = 35, 602 .size = sizeof(u32), .align = sizeof(u32), 603 .active = evr_active, .regset_get = evr_get, .set = evr_set 604 }, 605#endif 606#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 607 [REGSET_TM_CGPR] = { 608 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, 609 .size = sizeof(long), .align = sizeof(long), 610 .active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set 611 }, 612 [REGSET_TM_CFPR] = { 613 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, 614 .size = sizeof(double), .align = sizeof(double), 615 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set 616 }, 617 [REGSET_TM_CVMX] = { 618 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, 619 .size = sizeof(vector128), .align = sizeof(vector128), 620 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set 621 }, 622 [REGSET_TM_CVSX] = { 623 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, 624 .size = sizeof(double), .align = sizeof(double), 625 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set 626 }, 627 [REGSET_TM_SPR] = { 628 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, 629 .size = sizeof(u64), .align = sizeof(u64), 630 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set 631 }, 632 [REGSET_TM_CTAR] = { 633 .core_note_type = NT_PPC_TM_CTAR, .n = 1, 634 .size = sizeof(u64), .align = sizeof(u64), 635 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set 636 }, 637 [REGSET_TM_CPPR] = { 638 .core_note_type = NT_PPC_TM_CPPR, .n = 1, 639 .size = sizeof(u64), .align = sizeof(u64), 640 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set 641 }, 642 [REGSET_TM_CDSCR] = { 643 .core_note_type = NT_PPC_TM_CDSCR, .n = 1, 644 .size = sizeof(u64), .align = sizeof(u64), 645 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set 646 }, 647#endif 648#ifdef CONFIG_PPC64 649 [REGSET_PPR] = { 650 .core_note_type = NT_PPC_PPR, .n = 1, 651 .size = sizeof(u64), .align = sizeof(u64), 652 .regset_get = ppr_get, .set = ppr_set 653 }, 654 [REGSET_DSCR] = { 655 .core_note_type = NT_PPC_DSCR, .n = 1, 656 .size = sizeof(u64), .align = sizeof(u64), 657 .regset_get = dscr_get, .set = dscr_set 658 }, 659#endif 660#ifdef CONFIG_PPC_BOOK3S_64 661 [REGSET_TAR] = { 662 .core_note_type = NT_PPC_TAR, .n = 1, 663 .size = sizeof(u64), .align = sizeof(u64), 664 .regset_get = tar_get, .set = tar_set 665 }, 666 [REGSET_EBB] = { 667 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, 668 .size = sizeof(u64), .align = sizeof(u64), 669 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set 670 }, 671 [REGSET_PMR] = { 672 .core_note_type = NT_PPC_PMU, .n = ELF_NPMU, 673 .size = sizeof(u64), .align = sizeof(u64), 674 .active = pmu_active, .regset_get = pmu_get, .set = pmu_set 675 }, 676 [REGSET_DEXCR] = { 677 .core_note_type = NT_PPC_DEXCR, .n = ELF_NDEXCR, 678 .size = sizeof(u64), .align = sizeof(u64), 679 .active = dexcr_active, .regset_get = dexcr_get 680 }, 681#ifdef CONFIG_CHECKPOINT_RESTORE 682 [REGSET_HASHKEYR] = { 683 .core_note_type = NT_PPC_HASHKEYR, .n = ELF_NHASHKEYR, 684 .size = sizeof(u64), .align = sizeof(u64), 685 .active = hashkeyr_active, .regset_get = hashkeyr_get, .set = hashkeyr_set 686 }, 687#endif 688#endif 689#ifdef CONFIG_PPC_MEM_KEYS 690 [REGSET_PKEY] = { 691 .core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY, 692 .size = sizeof(u64), .align = sizeof(u64), 693 .active = pkey_active, .regset_get = pkey_get, .set = pkey_set 694 }, 695#endif 696}; 697 698const struct user_regset_view user_ppc_native_view = { 699 .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, 700 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) 701}; 702 703#include <linux/compat.h> 704 705int gpr32_get_common(struct task_struct *target, 706 const struct user_regset *regset, 707 struct membuf to, unsigned long *regs) 708{ 709 int i; 710 711 for (i = 0; i < PT_MSR; i++) 712 membuf_store(&to, (u32)regs[i]); 713 membuf_store(&to, (u32)get_user_msr(target)); 714 for (i++ ; i < PT_REGS_COUNT; i++) 715 membuf_store(&to, (u32)regs[i]); 716 return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32)); 717} 718 719static int gpr32_set_common_kernel(struct task_struct *target, 720 const struct user_regset *regset, 721 unsigned int pos, unsigned int count, 722 const void *kbuf, unsigned long *regs) 723{ 724 const compat_ulong_t *k = kbuf; 725 726 pos /= sizeof(compat_ulong_t); 727 count /= sizeof(compat_ulong_t); 728 729 for (; count > 0 && pos < PT_MSR; --count) 730 regs[pos++] = *k++; 731 732 if (count > 0 && pos == PT_MSR) { 733 set_user_msr(target, *k++); 734 ++pos; 735 --count; 736 } 737 738 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) 739 regs[pos++] = *k++; 740 for (; count > 0 && pos < PT_TRAP; --count, ++pos) 741 ++k; 742 743 if (count > 0 && pos == PT_TRAP) { 744 set_user_trap(target, *k++); 745 ++pos; 746 --count; 747 } 748 749 kbuf = k; 750 pos *= sizeof(compat_ulong_t); 751 count *= sizeof(compat_ulong_t); 752 user_regset_copyin_ignore(&pos, &count, &kbuf, NULL, 753 (PT_TRAP + 1) * sizeof(compat_ulong_t), -1); 754 return 0; 755} 756 757static int gpr32_set_common_user(struct task_struct *target, 758 const struct user_regset *regset, 759 unsigned int pos, unsigned int count, 760 const void __user *ubuf, unsigned long *regs) 761{ 762 const compat_ulong_t __user *u = ubuf; 763 const void *kbuf = NULL; 764 compat_ulong_t reg; 765 766 if (!user_read_access_begin(u, count)) 767 return -EFAULT; 768 769 pos /= sizeof(reg); 770 count /= sizeof(reg); 771 772 for (; count > 0 && pos < PT_MSR; --count) { 773 unsafe_get_user(reg, u++, Efault); 774 regs[pos++] = reg; 775 } 776 777 if (count > 0 && pos == PT_MSR) { 778 unsafe_get_user(reg, u++, Efault); 779 set_user_msr(target, reg); 780 ++pos; 781 --count; 782 } 783 784 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) { 785 unsafe_get_user(reg, u++, Efault); 786 regs[pos++] = reg; 787 } 788 for (; count > 0 && pos < PT_TRAP; --count, ++pos) 789 unsafe_get_user(reg, u++, Efault); 790 791 if (count > 0 && pos == PT_TRAP) { 792 unsafe_get_user(reg, u++, Efault); 793 set_user_trap(target, reg); 794 ++pos; 795 --count; 796 } 797 user_read_access_end(); 798 799 ubuf = u; 800 pos *= sizeof(reg); 801 count *= sizeof(reg); 802 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 803 (PT_TRAP + 1) * sizeof(reg), -1); 804 return 0; 805 806Efault: 807 user_read_access_end(); 808 return -EFAULT; 809} 810 811int gpr32_set_common(struct task_struct *target, 812 const struct user_regset *regset, 813 unsigned int pos, unsigned int count, 814 const void *kbuf, const void __user *ubuf, 815 unsigned long *regs) 816{ 817 if (kbuf) 818 return gpr32_set_common_kernel(target, regset, pos, count, kbuf, regs); 819 else 820 return gpr32_set_common_user(target, regset, pos, count, ubuf, regs); 821} 822 823static int gpr32_get(struct task_struct *target, 824 const struct user_regset *regset, 825 struct membuf to) 826{ 827 if (target->thread.regs == NULL) 828 return -EIO; 829 830 return gpr32_get_common(target, regset, to, 831 &target->thread.regs->gpr[0]); 832} 833 834static int gpr32_set(struct task_struct *target, 835 const struct user_regset *regset, 836 unsigned int pos, unsigned int count, 837 const void *kbuf, const void __user *ubuf) 838{ 839 if (target->thread.regs == NULL) 840 return -EIO; 841 842 return gpr32_set_common(target, regset, pos, count, kbuf, ubuf, 843 &target->thread.regs->gpr[0]); 844} 845 846/* 847 * These are the regset flavors matching the CONFIG_PPC32 native set. 848 */ 849static const struct user_regset compat_regsets[] = { 850 [REGSET_GPR] = { 851 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 852 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t), 853 .regset_get = gpr32_get, .set = gpr32_set 854 }, 855 [REGSET_FPR] = { 856 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 857 .size = sizeof(double), .align = sizeof(double), 858 .regset_get = fpr_get, .set = fpr_set 859 }, 860#ifdef CONFIG_ALTIVEC 861 [REGSET_VMX] = { 862 .core_note_type = NT_PPC_VMX, .n = 34, 863 .size = sizeof(vector128), .align = sizeof(vector128), 864 .active = vr_active, .regset_get = vr_get, .set = vr_set 865 }, 866#endif 867#ifdef CONFIG_SPE 868 [REGSET_SPE] = { 869 .core_note_type = NT_PPC_SPE, .n = 35, 870 .size = sizeof(u32), .align = sizeof(u32), 871 .active = evr_active, .regset_get = evr_get, .set = evr_set 872 }, 873#endif 874#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 875 [REGSET_TM_CGPR] = { 876 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, 877 .size = sizeof(long), .align = sizeof(long), 878 .active = tm_cgpr_active, 879 .regset_get = tm_cgpr32_get, .set = tm_cgpr32_set 880 }, 881 [REGSET_TM_CFPR] = { 882 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, 883 .size = sizeof(double), .align = sizeof(double), 884 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set 885 }, 886 [REGSET_TM_CVMX] = { 887 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, 888 .size = sizeof(vector128), .align = sizeof(vector128), 889 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set 890 }, 891 [REGSET_TM_CVSX] = { 892 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, 893 .size = sizeof(double), .align = sizeof(double), 894 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set 895 }, 896 [REGSET_TM_SPR] = { 897 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, 898 .size = sizeof(u64), .align = sizeof(u64), 899 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set 900 }, 901 [REGSET_TM_CTAR] = { 902 .core_note_type = NT_PPC_TM_CTAR, .n = 1, 903 .size = sizeof(u64), .align = sizeof(u64), 904 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set 905 }, 906 [REGSET_TM_CPPR] = { 907 .core_note_type = NT_PPC_TM_CPPR, .n = 1, 908 .size = sizeof(u64), .align = sizeof(u64), 909 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set 910 }, 911 [REGSET_TM_CDSCR] = { 912 .core_note_type = NT_PPC_TM_CDSCR, .n = 1, 913 .size = sizeof(u64), .align = sizeof(u64), 914 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set 915 }, 916#endif 917#ifdef CONFIG_PPC64 918 [REGSET_PPR] = { 919 .core_note_type = NT_PPC_PPR, .n = 1, 920 .size = sizeof(u64), .align = sizeof(u64), 921 .regset_get = ppr_get, .set = ppr_set 922 }, 923 [REGSET_DSCR] = { 924 .core_note_type = NT_PPC_DSCR, .n = 1, 925 .size = sizeof(u64), .align = sizeof(u64), 926 .regset_get = dscr_get, .set = dscr_set 927 }, 928#endif 929#ifdef CONFIG_PPC_BOOK3S_64 930 [REGSET_TAR] = { 931 .core_note_type = NT_PPC_TAR, .n = 1, 932 .size = sizeof(u64), .align = sizeof(u64), 933 .regset_get = tar_get, .set = tar_set 934 }, 935 [REGSET_EBB] = { 936 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, 937 .size = sizeof(u64), .align = sizeof(u64), 938 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set 939 }, 940#endif 941}; 942 943static const struct user_regset_view user_ppc_compat_view = { 944 .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI, 945 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets) 946}; 947 948const struct user_regset_view *task_user_regset_view(struct task_struct *task) 949{ 950 if (IS_ENABLED(CONFIG_COMPAT) && is_tsk_32bit_task(task)) 951 return &user_ppc_compat_view; 952 return &user_ppc_native_view; 953} 954