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 __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 123 static int get_user_dscr(struct task_struct *task, unsigned long *data) 124 { 125 *data = task->thread.dscr; 126 return 0; 127 } 128 129 static 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 136 static int get_user_dscr(struct task_struct *task, unsigned long *data) 137 { 138 return -EIO; 139 } 140 141 static 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 */ 151 static __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 */ 160 int 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 */ 198 int 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 } 217 218 static 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 } 237 238 static 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 290 static 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 } 298 299 static 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 } 309 310 static 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 } 315 static 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_64 324 static 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 } 329 static 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 } 336 337 static 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 } 347 348 static 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 } 363 364 static 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 } 395 static 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 } 402 403 static 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 } 417 418 static 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 } 457 458 static 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 } 465 466 static 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 #endif /* CONFIG_PPC_BOOK3S_64 */ 487 488 #ifdef CONFIG_PPC_MEM_KEYS 489 static int pkey_active(struct task_struct *target, const struct user_regset *regset) 490 { 491 if (!arch_pkeys_enabled()) 492 return -ENODEV; 493 494 return regset->n; 495 } 496 497 static int pkey_get(struct task_struct *target, const struct user_regset *regset, 498 struct membuf to) 499 { 500 501 if (!arch_pkeys_enabled()) 502 return -ENODEV; 503 504 membuf_store(&to, target->thread.regs->amr); 505 membuf_store(&to, target->thread.regs->iamr); 506 return membuf_store(&to, default_uamor); 507 } 508 509 static int pkey_set(struct task_struct *target, const struct user_regset *regset, 510 unsigned int pos, unsigned int count, const void *kbuf, 511 const void __user *ubuf) 512 { 513 u64 new_amr; 514 int ret; 515 516 if (!arch_pkeys_enabled()) 517 return -ENODEV; 518 519 /* Only the AMR can be set from userspace */ 520 if (pos != 0 || count != sizeof(new_amr)) 521 return -EINVAL; 522 523 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 524 &new_amr, 0, sizeof(new_amr)); 525 if (ret) 526 return ret; 527 528 /* 529 * UAMOR determines which bits of the AMR can be set from userspace. 530 * UAMOR value 0b11 indicates that the AMR value can be modified 531 * from userspace. If the kernel is using a specific key, we avoid 532 * userspace modifying the AMR value for that key by masking them 533 * via UAMOR 0b00. 534 * 535 * Pick the AMR values for the keys that kernel is using. This 536 * will be indicated by the ~default_uamor bits. 537 */ 538 target->thread.regs->amr = (new_amr & default_uamor) | 539 (target->thread.regs->amr & ~default_uamor); 540 541 return 0; 542 } 543 #endif /* CONFIG_PPC_MEM_KEYS */ 544 545 static const struct user_regset native_regsets[] = { 546 [REGSET_GPR] = { 547 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 548 .size = sizeof(long), .align = sizeof(long), 549 .regset_get = gpr_get, .set = gpr_set 550 }, 551 [REGSET_FPR] = { 552 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 553 .size = sizeof(double), .align = sizeof(double), 554 .regset_get = fpr_get, .set = fpr_set 555 }, 556 #ifdef CONFIG_ALTIVEC 557 [REGSET_VMX] = { 558 .core_note_type = NT_PPC_VMX, .n = 34, 559 .size = sizeof(vector128), .align = sizeof(vector128), 560 .active = vr_active, .regset_get = vr_get, .set = vr_set 561 }, 562 #endif 563 #ifdef CONFIG_VSX 564 [REGSET_VSX] = { 565 .core_note_type = NT_PPC_VSX, .n = 32, 566 .size = sizeof(double), .align = sizeof(double), 567 .active = vsr_active, .regset_get = vsr_get, .set = vsr_set 568 }, 569 #endif 570 #ifdef CONFIG_SPE 571 [REGSET_SPE] = { 572 .core_note_type = NT_PPC_SPE, .n = 35, 573 .size = sizeof(u32), .align = sizeof(u32), 574 .active = evr_active, .regset_get = evr_get, .set = evr_set 575 }, 576 #endif 577 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 578 [REGSET_TM_CGPR] = { 579 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, 580 .size = sizeof(long), .align = sizeof(long), 581 .active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set 582 }, 583 [REGSET_TM_CFPR] = { 584 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, 585 .size = sizeof(double), .align = sizeof(double), 586 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set 587 }, 588 [REGSET_TM_CVMX] = { 589 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, 590 .size = sizeof(vector128), .align = sizeof(vector128), 591 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set 592 }, 593 [REGSET_TM_CVSX] = { 594 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, 595 .size = sizeof(double), .align = sizeof(double), 596 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set 597 }, 598 [REGSET_TM_SPR] = { 599 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, 600 .size = sizeof(u64), .align = sizeof(u64), 601 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set 602 }, 603 [REGSET_TM_CTAR] = { 604 .core_note_type = NT_PPC_TM_CTAR, .n = 1, 605 .size = sizeof(u64), .align = sizeof(u64), 606 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set 607 }, 608 [REGSET_TM_CPPR] = { 609 .core_note_type = NT_PPC_TM_CPPR, .n = 1, 610 .size = sizeof(u64), .align = sizeof(u64), 611 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set 612 }, 613 [REGSET_TM_CDSCR] = { 614 .core_note_type = NT_PPC_TM_CDSCR, .n = 1, 615 .size = sizeof(u64), .align = sizeof(u64), 616 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set 617 }, 618 #endif 619 #ifdef CONFIG_PPC64 620 [REGSET_PPR] = { 621 .core_note_type = NT_PPC_PPR, .n = 1, 622 .size = sizeof(u64), .align = sizeof(u64), 623 .regset_get = ppr_get, .set = ppr_set 624 }, 625 [REGSET_DSCR] = { 626 .core_note_type = NT_PPC_DSCR, .n = 1, 627 .size = sizeof(u64), .align = sizeof(u64), 628 .regset_get = dscr_get, .set = dscr_set 629 }, 630 #endif 631 #ifdef CONFIG_PPC_BOOK3S_64 632 [REGSET_TAR] = { 633 .core_note_type = NT_PPC_TAR, .n = 1, 634 .size = sizeof(u64), .align = sizeof(u64), 635 .regset_get = tar_get, .set = tar_set 636 }, 637 [REGSET_EBB] = { 638 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, 639 .size = sizeof(u64), .align = sizeof(u64), 640 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set 641 }, 642 [REGSET_PMR] = { 643 .core_note_type = NT_PPC_PMU, .n = ELF_NPMU, 644 .size = sizeof(u64), .align = sizeof(u64), 645 .active = pmu_active, .regset_get = pmu_get, .set = pmu_set 646 }, 647 [REGSET_DEXCR] = { 648 .core_note_type = NT_PPC_DEXCR, .n = ELF_NDEXCR, 649 .size = sizeof(u64), .align = sizeof(u64), 650 .active = dexcr_active, .regset_get = dexcr_get 651 }, 652 #endif 653 #ifdef CONFIG_PPC_MEM_KEYS 654 [REGSET_PKEY] = { 655 .core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY, 656 .size = sizeof(u64), .align = sizeof(u64), 657 .active = pkey_active, .regset_get = pkey_get, .set = pkey_set 658 }, 659 #endif 660 }; 661 662 const struct user_regset_view user_ppc_native_view = { 663 .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, 664 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) 665 }; 666 667 #include <linux/compat.h> 668 669 int gpr32_get_common(struct task_struct *target, 670 const struct user_regset *regset, 671 struct membuf to, unsigned long *regs) 672 { 673 int i; 674 675 for (i = 0; i < PT_MSR; i++) 676 membuf_store(&to, (u32)regs[i]); 677 membuf_store(&to, (u32)get_user_msr(target)); 678 for (i++ ; i < PT_REGS_COUNT; i++) 679 membuf_store(&to, (u32)regs[i]); 680 return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32)); 681 } 682 683 int gpr32_set_common(struct task_struct *target, 684 const struct user_regset *regset, 685 unsigned int pos, unsigned int count, 686 const void *kbuf, const void __user *ubuf, 687 unsigned long *regs) 688 { 689 const compat_ulong_t *k = kbuf; 690 const compat_ulong_t __user *u = ubuf; 691 compat_ulong_t reg; 692 693 if (!kbuf && !user_read_access_begin(u, count)) 694 return -EFAULT; 695 696 pos /= sizeof(reg); 697 count /= sizeof(reg); 698 699 if (kbuf) 700 for (; count > 0 && pos < PT_MSR; --count) 701 regs[pos++] = *k++; 702 else 703 for (; count > 0 && pos < PT_MSR; --count) { 704 unsafe_get_user(reg, u++, Efault); 705 regs[pos++] = reg; 706 } 707 708 709 if (count > 0 && pos == PT_MSR) { 710 if (kbuf) 711 reg = *k++; 712 else 713 unsafe_get_user(reg, u++, Efault); 714 set_user_msr(target, reg); 715 ++pos; 716 --count; 717 } 718 719 if (kbuf) { 720 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) 721 regs[pos++] = *k++; 722 for (; count > 0 && pos < PT_TRAP; --count, ++pos) 723 ++k; 724 } else { 725 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) { 726 unsafe_get_user(reg, u++, Efault); 727 regs[pos++] = reg; 728 } 729 for (; count > 0 && pos < PT_TRAP; --count, ++pos) 730 unsafe_get_user(reg, u++, Efault); 731 } 732 733 if (count > 0 && pos == PT_TRAP) { 734 if (kbuf) 735 reg = *k++; 736 else 737 unsafe_get_user(reg, u++, Efault); 738 set_user_trap(target, reg); 739 ++pos; 740 --count; 741 } 742 if (!kbuf) 743 user_read_access_end(); 744 745 kbuf = k; 746 ubuf = u; 747 pos *= sizeof(reg); 748 count *= sizeof(reg); 749 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 750 (PT_TRAP + 1) * sizeof(reg), -1); 751 return 0; 752 753 Efault: 754 user_read_access_end(); 755 return -EFAULT; 756 } 757 758 static int gpr32_get(struct task_struct *target, 759 const struct user_regset *regset, 760 struct membuf to) 761 { 762 if (target->thread.regs == NULL) 763 return -EIO; 764 765 return gpr32_get_common(target, regset, to, 766 &target->thread.regs->gpr[0]); 767 } 768 769 static int gpr32_set(struct task_struct *target, 770 const struct user_regset *regset, 771 unsigned int pos, unsigned int count, 772 const void *kbuf, const void __user *ubuf) 773 { 774 if (target->thread.regs == NULL) 775 return -EIO; 776 777 return gpr32_set_common(target, regset, pos, count, kbuf, ubuf, 778 &target->thread.regs->gpr[0]); 779 } 780 781 /* 782 * These are the regset flavors matching the CONFIG_PPC32 native set. 783 */ 784 static const struct user_regset compat_regsets[] = { 785 [REGSET_GPR] = { 786 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 787 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t), 788 .regset_get = gpr32_get, .set = gpr32_set 789 }, 790 [REGSET_FPR] = { 791 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 792 .size = sizeof(double), .align = sizeof(double), 793 .regset_get = fpr_get, .set = fpr_set 794 }, 795 #ifdef CONFIG_ALTIVEC 796 [REGSET_VMX] = { 797 .core_note_type = NT_PPC_VMX, .n = 34, 798 .size = sizeof(vector128), .align = sizeof(vector128), 799 .active = vr_active, .regset_get = vr_get, .set = vr_set 800 }, 801 #endif 802 #ifdef CONFIG_SPE 803 [REGSET_SPE] = { 804 .core_note_type = NT_PPC_SPE, .n = 35, 805 .size = sizeof(u32), .align = sizeof(u32), 806 .active = evr_active, .regset_get = evr_get, .set = evr_set 807 }, 808 #endif 809 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 810 [REGSET_TM_CGPR] = { 811 .core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG, 812 .size = sizeof(long), .align = sizeof(long), 813 .active = tm_cgpr_active, 814 .regset_get = tm_cgpr32_get, .set = tm_cgpr32_set 815 }, 816 [REGSET_TM_CFPR] = { 817 .core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG, 818 .size = sizeof(double), .align = sizeof(double), 819 .active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set 820 }, 821 [REGSET_TM_CVMX] = { 822 .core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX, 823 .size = sizeof(vector128), .align = sizeof(vector128), 824 .active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set 825 }, 826 [REGSET_TM_CVSX] = { 827 .core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX, 828 .size = sizeof(double), .align = sizeof(double), 829 .active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set 830 }, 831 [REGSET_TM_SPR] = { 832 .core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG, 833 .size = sizeof(u64), .align = sizeof(u64), 834 .active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set 835 }, 836 [REGSET_TM_CTAR] = { 837 .core_note_type = NT_PPC_TM_CTAR, .n = 1, 838 .size = sizeof(u64), .align = sizeof(u64), 839 .active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set 840 }, 841 [REGSET_TM_CPPR] = { 842 .core_note_type = NT_PPC_TM_CPPR, .n = 1, 843 .size = sizeof(u64), .align = sizeof(u64), 844 .active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set 845 }, 846 [REGSET_TM_CDSCR] = { 847 .core_note_type = NT_PPC_TM_CDSCR, .n = 1, 848 .size = sizeof(u64), .align = sizeof(u64), 849 .active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set 850 }, 851 #endif 852 #ifdef CONFIG_PPC64 853 [REGSET_PPR] = { 854 .core_note_type = NT_PPC_PPR, .n = 1, 855 .size = sizeof(u64), .align = sizeof(u64), 856 .regset_get = ppr_get, .set = ppr_set 857 }, 858 [REGSET_DSCR] = { 859 .core_note_type = NT_PPC_DSCR, .n = 1, 860 .size = sizeof(u64), .align = sizeof(u64), 861 .regset_get = dscr_get, .set = dscr_set 862 }, 863 #endif 864 #ifdef CONFIG_PPC_BOOK3S_64 865 [REGSET_TAR] = { 866 .core_note_type = NT_PPC_TAR, .n = 1, 867 .size = sizeof(u64), .align = sizeof(u64), 868 .regset_get = tar_get, .set = tar_set 869 }, 870 [REGSET_EBB] = { 871 .core_note_type = NT_PPC_EBB, .n = ELF_NEBB, 872 .size = sizeof(u64), .align = sizeof(u64), 873 .active = ebb_active, .regset_get = ebb_get, .set = ebb_set 874 }, 875 #endif 876 }; 877 878 static const struct user_regset_view user_ppc_compat_view = { 879 .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI, 880 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets) 881 }; 882 883 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 884 { 885 if (IS_ENABLED(CONFIG_COMPAT) && is_tsk_32bit_task(task)) 886 return &user_ppc_compat_view; 887 return &user_ppc_native_view; 888 } 889