1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1992 Ross Biro 7 * Copyright (C) Linus Torvalds 8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle 9 * Copyright (C) 1996 David S. Miller 10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com 11 * Copyright (C) 1999 MIPS Technologies, Inc. 12 * Copyright (C) 2000 Ulf Carlsson 13 * 14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit 15 * binaries. 16 */ 17 #include <linux/compiler.h> 18 #include <linux/context_tracking.h> 19 #include <linux/elf.h> 20 #include <linux/kernel.h> 21 #include <linux/sched.h> 22 #include <linux/sched/task_stack.h> 23 #include <linux/mm.h> 24 #include <linux/errno.h> 25 #include <linux/ptrace.h> 26 #include <linux/regset.h> 27 #include <linux/smp.h> 28 #include <linux/security.h> 29 #include <linux/stddef.h> 30 #include <linux/tracehook.h> 31 #include <linux/audit.h> 32 #include <linux/seccomp.h> 33 #include <linux/ftrace.h> 34 35 #include <asm/byteorder.h> 36 #include <asm/cpu.h> 37 #include <asm/cpu-info.h> 38 #include <asm/dsp.h> 39 #include <asm/fpu.h> 40 #include <asm/mipsregs.h> 41 #include <asm/mipsmtregs.h> 42 #include <asm/pgtable.h> 43 #include <asm/page.h> 44 #include <asm/syscall.h> 45 #include <linux/uaccess.h> 46 #include <asm/bootinfo.h> 47 #include <asm/reg.h> 48 49 #define CREATE_TRACE_POINTS 50 #include <trace/events/syscalls.h> 51 52 static void init_fp_ctx(struct task_struct *target) 53 { 54 /* If FP has been used then the target already has context */ 55 if (tsk_used_math(target)) 56 return; 57 58 /* Begin with data registers set to all 1s... */ 59 memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr)); 60 61 /* FCSR has been preset by `mips_set_personality_nan'. */ 62 63 /* 64 * Record that the target has "used" math, such that the context 65 * just initialised, and any modifications made by the caller, 66 * aren't discarded. 67 */ 68 set_stopped_child_used_math(target); 69 } 70 71 /* 72 * Called by kernel/ptrace.c when detaching.. 73 * 74 * Make sure single step bits etc are not set. 75 */ 76 void ptrace_disable(struct task_struct *child) 77 { 78 /* Don't load the watchpoint registers for the ex-child. */ 79 clear_tsk_thread_flag(child, TIF_LOAD_WATCH); 80 } 81 82 /* 83 * Poke at FCSR according to its mask. Set the Cause bits even 84 * if a corresponding Enable bit is set. This will be noticed at 85 * the time the thread is switched to and SIGFPE thrown accordingly. 86 */ 87 static void ptrace_setfcr31(struct task_struct *child, u32 value) 88 { 89 u32 fcr31; 90 u32 mask; 91 92 fcr31 = child->thread.fpu.fcr31; 93 mask = boot_cpu_data.fpu_msk31; 94 child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask); 95 } 96 97 /* 98 * Read a general register set. We always use the 64-bit format, even 99 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel. 100 * Registers are sign extended to fill the available space. 101 */ 102 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data) 103 { 104 struct pt_regs *regs; 105 int i; 106 107 if (!access_ok(VERIFY_WRITE, data, 38 * 8)) 108 return -EIO; 109 110 regs = task_pt_regs(child); 111 112 for (i = 0; i < 32; i++) 113 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]); 114 __put_user((long)regs->lo, (__s64 __user *)&data->lo); 115 __put_user((long)regs->hi, (__s64 __user *)&data->hi); 116 __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc); 117 __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr); 118 __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status); 119 __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause); 120 121 return 0; 122 } 123 124 /* 125 * Write a general register set. As for PTRACE_GETREGS, we always use 126 * the 64-bit format. On a 32-bit kernel only the lower order half 127 * (according to endianness) will be used. 128 */ 129 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data) 130 { 131 struct pt_regs *regs; 132 int i; 133 134 if (!access_ok(VERIFY_READ, data, 38 * 8)) 135 return -EIO; 136 137 regs = task_pt_regs(child); 138 139 for (i = 0; i < 32; i++) 140 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]); 141 __get_user(regs->lo, (__s64 __user *)&data->lo); 142 __get_user(regs->hi, (__s64 __user *)&data->hi); 143 __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc); 144 145 /* badvaddr, status, and cause may not be written. */ 146 147 return 0; 148 } 149 150 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data) 151 { 152 int i; 153 154 if (!access_ok(VERIFY_WRITE, data, 33 * 8)) 155 return -EIO; 156 157 if (tsk_used_math(child)) { 158 union fpureg *fregs = get_fpu_regs(child); 159 for (i = 0; i < 32; i++) 160 __put_user(get_fpr64(&fregs[i], 0), 161 i + (__u64 __user *)data); 162 } else { 163 for (i = 0; i < 32; i++) 164 __put_user((__u64) -1, i + (__u64 __user *) data); 165 } 166 167 __put_user(child->thread.fpu.fcr31, data + 64); 168 __put_user(boot_cpu_data.fpu_id, data + 65); 169 170 return 0; 171 } 172 173 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data) 174 { 175 union fpureg *fregs; 176 u64 fpr_val; 177 u32 value; 178 int i; 179 180 if (!access_ok(VERIFY_READ, data, 33 * 8)) 181 return -EIO; 182 183 init_fp_ctx(child); 184 fregs = get_fpu_regs(child); 185 186 for (i = 0; i < 32; i++) { 187 __get_user(fpr_val, i + (__u64 __user *)data); 188 set_fpr64(&fregs[i], 0, fpr_val); 189 } 190 191 __get_user(value, data + 64); 192 ptrace_setfcr31(child, value); 193 194 /* FIR may not be written. */ 195 196 return 0; 197 } 198 199 int ptrace_get_watch_regs(struct task_struct *child, 200 struct pt_watch_regs __user *addr) 201 { 202 enum pt_watch_style style; 203 int i; 204 205 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0) 206 return -EIO; 207 if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs))) 208 return -EIO; 209 210 #ifdef CONFIG_32BIT 211 style = pt_watch_style_mips32; 212 #define WATCH_STYLE mips32 213 #else 214 style = pt_watch_style_mips64; 215 #define WATCH_STYLE mips64 216 #endif 217 218 __put_user(style, &addr->style); 219 __put_user(boot_cpu_data.watch_reg_use_cnt, 220 &addr->WATCH_STYLE.num_valid); 221 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { 222 __put_user(child->thread.watch.mips3264.watchlo[i], 223 &addr->WATCH_STYLE.watchlo[i]); 224 __put_user(child->thread.watch.mips3264.watchhi[i] & 225 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW), 226 &addr->WATCH_STYLE.watchhi[i]); 227 __put_user(boot_cpu_data.watch_reg_masks[i], 228 &addr->WATCH_STYLE.watch_masks[i]); 229 } 230 for (; i < 8; i++) { 231 __put_user(0, &addr->WATCH_STYLE.watchlo[i]); 232 __put_user(0, &addr->WATCH_STYLE.watchhi[i]); 233 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]); 234 } 235 236 return 0; 237 } 238 239 int ptrace_set_watch_regs(struct task_struct *child, 240 struct pt_watch_regs __user *addr) 241 { 242 int i; 243 int watch_active = 0; 244 unsigned long lt[NUM_WATCH_REGS]; 245 u16 ht[NUM_WATCH_REGS]; 246 247 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0) 248 return -EIO; 249 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs))) 250 return -EIO; 251 /* Check the values. */ 252 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { 253 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]); 254 #ifdef CONFIG_32BIT 255 if (lt[i] & __UA_LIMIT) 256 return -EINVAL; 257 #else 258 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) { 259 if (lt[i] & 0xffffffff80000000UL) 260 return -EINVAL; 261 } else { 262 if (lt[i] & __UA_LIMIT) 263 return -EINVAL; 264 } 265 #endif 266 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]); 267 if (ht[i] & ~MIPS_WATCHHI_MASK) 268 return -EINVAL; 269 } 270 /* Install them. */ 271 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) { 272 if (lt[i] & MIPS_WATCHLO_IRW) 273 watch_active = 1; 274 child->thread.watch.mips3264.watchlo[i] = lt[i]; 275 /* Set the G bit. */ 276 child->thread.watch.mips3264.watchhi[i] = ht[i]; 277 } 278 279 if (watch_active) 280 set_tsk_thread_flag(child, TIF_LOAD_WATCH); 281 else 282 clear_tsk_thread_flag(child, TIF_LOAD_WATCH); 283 284 return 0; 285 } 286 287 /* regset get/set implementations */ 288 289 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32) 290 291 static int gpr32_get(struct task_struct *target, 292 const struct user_regset *regset, 293 unsigned int pos, unsigned int count, 294 void *kbuf, void __user *ubuf) 295 { 296 struct pt_regs *regs = task_pt_regs(target); 297 u32 uregs[ELF_NGREG] = {}; 298 299 mips_dump_regs32(uregs, regs); 300 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, 301 sizeof(uregs)); 302 } 303 304 static int gpr32_set(struct task_struct *target, 305 const struct user_regset *regset, 306 unsigned int pos, unsigned int count, 307 const void *kbuf, const void __user *ubuf) 308 { 309 struct pt_regs *regs = task_pt_regs(target); 310 u32 uregs[ELF_NGREG]; 311 unsigned start, num_regs, i; 312 int err; 313 314 start = pos / sizeof(u32); 315 num_regs = count / sizeof(u32); 316 317 if (start + num_regs > ELF_NGREG) 318 return -EIO; 319 320 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0, 321 sizeof(uregs)); 322 if (err) 323 return err; 324 325 for (i = start; i < num_regs; i++) { 326 /* 327 * Cast all values to signed here so that if this is a 64-bit 328 * kernel, the supplied 32-bit values will be sign extended. 329 */ 330 switch (i) { 331 case MIPS32_EF_R1 ... MIPS32_EF_R25: 332 /* k0/k1 are ignored. */ 333 case MIPS32_EF_R28 ... MIPS32_EF_R31: 334 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i]; 335 break; 336 case MIPS32_EF_LO: 337 regs->lo = (s32)uregs[i]; 338 break; 339 case MIPS32_EF_HI: 340 regs->hi = (s32)uregs[i]; 341 break; 342 case MIPS32_EF_CP0_EPC: 343 regs->cp0_epc = (s32)uregs[i]; 344 break; 345 } 346 } 347 348 return 0; 349 } 350 351 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */ 352 353 #ifdef CONFIG_64BIT 354 355 static int gpr64_get(struct task_struct *target, 356 const struct user_regset *regset, 357 unsigned int pos, unsigned int count, 358 void *kbuf, void __user *ubuf) 359 { 360 struct pt_regs *regs = task_pt_regs(target); 361 u64 uregs[ELF_NGREG] = {}; 362 363 mips_dump_regs64(uregs, regs); 364 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, 365 sizeof(uregs)); 366 } 367 368 static int gpr64_set(struct task_struct *target, 369 const struct user_regset *regset, 370 unsigned int pos, unsigned int count, 371 const void *kbuf, const void __user *ubuf) 372 { 373 struct pt_regs *regs = task_pt_regs(target); 374 u64 uregs[ELF_NGREG]; 375 unsigned start, num_regs, i; 376 int err; 377 378 start = pos / sizeof(u64); 379 num_regs = count / sizeof(u64); 380 381 if (start + num_regs > ELF_NGREG) 382 return -EIO; 383 384 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0, 385 sizeof(uregs)); 386 if (err) 387 return err; 388 389 for (i = start; i < num_regs; i++) { 390 switch (i) { 391 case MIPS64_EF_R1 ... MIPS64_EF_R25: 392 /* k0/k1 are ignored. */ 393 case MIPS64_EF_R28 ... MIPS64_EF_R31: 394 regs->regs[i - MIPS64_EF_R0] = uregs[i]; 395 break; 396 case MIPS64_EF_LO: 397 regs->lo = uregs[i]; 398 break; 399 case MIPS64_EF_HI: 400 regs->hi = uregs[i]; 401 break; 402 case MIPS64_EF_CP0_EPC: 403 regs->cp0_epc = uregs[i]; 404 break; 405 } 406 } 407 408 return 0; 409 } 410 411 #endif /* CONFIG_64BIT */ 412 413 static int fpr_get(struct task_struct *target, 414 const struct user_regset *regset, 415 unsigned int pos, unsigned int count, 416 void *kbuf, void __user *ubuf) 417 { 418 unsigned i; 419 int err; 420 u64 fpr_val; 421 422 /* XXX fcr31 */ 423 424 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t)) 425 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, 426 &target->thread.fpu, 427 0, sizeof(elf_fpregset_t)); 428 429 for (i = 0; i < NUM_FPU_REGS; i++) { 430 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0); 431 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf, 432 &fpr_val, i * sizeof(elf_fpreg_t), 433 (i + 1) * sizeof(elf_fpreg_t)); 434 if (err) 435 return err; 436 } 437 438 return 0; 439 } 440 441 static int fpr_set(struct task_struct *target, 442 const struct user_regset *regset, 443 unsigned int pos, unsigned int count, 444 const void *kbuf, const void __user *ubuf) 445 { 446 unsigned i; 447 int err; 448 u64 fpr_val; 449 450 /* XXX fcr31 */ 451 452 init_fp_ctx(target); 453 454 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t)) 455 return user_regset_copyin(&pos, &count, &kbuf, &ubuf, 456 &target->thread.fpu, 457 0, sizeof(elf_fpregset_t)); 458 459 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t)); 460 for (i = 0; i < NUM_FPU_REGS && count >= sizeof(elf_fpreg_t); i++) { 461 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 462 &fpr_val, i * sizeof(elf_fpreg_t), 463 (i + 1) * sizeof(elf_fpreg_t)); 464 if (err) 465 return err; 466 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val); 467 } 468 469 return 0; 470 } 471 472 enum mips_regset { 473 REGSET_GPR, 474 REGSET_FPR, 475 }; 476 477 struct pt_regs_offset { 478 const char *name; 479 int offset; 480 }; 481 482 #define REG_OFFSET_NAME(reg, r) { \ 483 .name = #reg, \ 484 .offset = offsetof(struct pt_regs, r) \ 485 } 486 487 #define REG_OFFSET_END { \ 488 .name = NULL, \ 489 .offset = 0 \ 490 } 491 492 static const struct pt_regs_offset regoffset_table[] = { 493 REG_OFFSET_NAME(r0, regs[0]), 494 REG_OFFSET_NAME(r1, regs[1]), 495 REG_OFFSET_NAME(r2, regs[2]), 496 REG_OFFSET_NAME(r3, regs[3]), 497 REG_OFFSET_NAME(r4, regs[4]), 498 REG_OFFSET_NAME(r5, regs[5]), 499 REG_OFFSET_NAME(r6, regs[6]), 500 REG_OFFSET_NAME(r7, regs[7]), 501 REG_OFFSET_NAME(r8, regs[8]), 502 REG_OFFSET_NAME(r9, regs[9]), 503 REG_OFFSET_NAME(r10, regs[10]), 504 REG_OFFSET_NAME(r11, regs[11]), 505 REG_OFFSET_NAME(r12, regs[12]), 506 REG_OFFSET_NAME(r13, regs[13]), 507 REG_OFFSET_NAME(r14, regs[14]), 508 REG_OFFSET_NAME(r15, regs[15]), 509 REG_OFFSET_NAME(r16, regs[16]), 510 REG_OFFSET_NAME(r17, regs[17]), 511 REG_OFFSET_NAME(r18, regs[18]), 512 REG_OFFSET_NAME(r19, regs[19]), 513 REG_OFFSET_NAME(r20, regs[20]), 514 REG_OFFSET_NAME(r21, regs[21]), 515 REG_OFFSET_NAME(r22, regs[22]), 516 REG_OFFSET_NAME(r23, regs[23]), 517 REG_OFFSET_NAME(r24, regs[24]), 518 REG_OFFSET_NAME(r25, regs[25]), 519 REG_OFFSET_NAME(r26, regs[26]), 520 REG_OFFSET_NAME(r27, regs[27]), 521 REG_OFFSET_NAME(r28, regs[28]), 522 REG_OFFSET_NAME(r29, regs[29]), 523 REG_OFFSET_NAME(r30, regs[30]), 524 REG_OFFSET_NAME(r31, regs[31]), 525 REG_OFFSET_NAME(c0_status, cp0_status), 526 REG_OFFSET_NAME(hi, hi), 527 REG_OFFSET_NAME(lo, lo), 528 #ifdef CONFIG_CPU_HAS_SMARTMIPS 529 REG_OFFSET_NAME(acx, acx), 530 #endif 531 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr), 532 REG_OFFSET_NAME(c0_cause, cp0_cause), 533 REG_OFFSET_NAME(c0_epc, cp0_epc), 534 #ifdef CONFIG_CPU_CAVIUM_OCTEON 535 REG_OFFSET_NAME(mpl0, mpl[0]), 536 REG_OFFSET_NAME(mpl1, mpl[1]), 537 REG_OFFSET_NAME(mpl2, mpl[2]), 538 REG_OFFSET_NAME(mtp0, mtp[0]), 539 REG_OFFSET_NAME(mtp1, mtp[1]), 540 REG_OFFSET_NAME(mtp2, mtp[2]), 541 #endif 542 REG_OFFSET_END, 543 }; 544 545 /** 546 * regs_query_register_offset() - query register offset from its name 547 * @name: the name of a register 548 * 549 * regs_query_register_offset() returns the offset of a register in struct 550 * pt_regs from its name. If the name is invalid, this returns -EINVAL; 551 */ 552 int regs_query_register_offset(const char *name) 553 { 554 const struct pt_regs_offset *roff; 555 for (roff = regoffset_table; roff->name != NULL; roff++) 556 if (!strcmp(roff->name, name)) 557 return roff->offset; 558 return -EINVAL; 559 } 560 561 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32) 562 563 static const struct user_regset mips_regsets[] = { 564 [REGSET_GPR] = { 565 .core_note_type = NT_PRSTATUS, 566 .n = ELF_NGREG, 567 .size = sizeof(unsigned int), 568 .align = sizeof(unsigned int), 569 .get = gpr32_get, 570 .set = gpr32_set, 571 }, 572 [REGSET_FPR] = { 573 .core_note_type = NT_PRFPREG, 574 .n = ELF_NFPREG, 575 .size = sizeof(elf_fpreg_t), 576 .align = sizeof(elf_fpreg_t), 577 .get = fpr_get, 578 .set = fpr_set, 579 }, 580 }; 581 582 static const struct user_regset_view user_mips_view = { 583 .name = "mips", 584 .e_machine = ELF_ARCH, 585 .ei_osabi = ELF_OSABI, 586 .regsets = mips_regsets, 587 .n = ARRAY_SIZE(mips_regsets), 588 }; 589 590 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */ 591 592 #ifdef CONFIG_64BIT 593 594 static const struct user_regset mips64_regsets[] = { 595 [REGSET_GPR] = { 596 .core_note_type = NT_PRSTATUS, 597 .n = ELF_NGREG, 598 .size = sizeof(unsigned long), 599 .align = sizeof(unsigned long), 600 .get = gpr64_get, 601 .set = gpr64_set, 602 }, 603 [REGSET_FPR] = { 604 .core_note_type = NT_PRFPREG, 605 .n = ELF_NFPREG, 606 .size = sizeof(elf_fpreg_t), 607 .align = sizeof(elf_fpreg_t), 608 .get = fpr_get, 609 .set = fpr_set, 610 }, 611 }; 612 613 static const struct user_regset_view user_mips64_view = { 614 .name = "mips64", 615 .e_machine = ELF_ARCH, 616 .ei_osabi = ELF_OSABI, 617 .regsets = mips64_regsets, 618 .n = ARRAY_SIZE(mips64_regsets), 619 }; 620 621 #endif /* CONFIG_64BIT */ 622 623 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 624 { 625 #ifdef CONFIG_32BIT 626 return &user_mips_view; 627 #else 628 #ifdef CONFIG_MIPS32_O32 629 if (test_tsk_thread_flag(task, TIF_32BIT_REGS)) 630 return &user_mips_view; 631 #endif 632 return &user_mips64_view; 633 #endif 634 } 635 636 long arch_ptrace(struct task_struct *child, long request, 637 unsigned long addr, unsigned long data) 638 { 639 int ret; 640 void __user *addrp = (void __user *) addr; 641 void __user *datavp = (void __user *) data; 642 unsigned long __user *datalp = (void __user *) data; 643 644 switch (request) { 645 /* when I and D space are separate, these will need to be fixed. */ 646 case PTRACE_PEEKTEXT: /* read word at location addr. */ 647 case PTRACE_PEEKDATA: 648 ret = generic_ptrace_peekdata(child, addr, data); 649 break; 650 651 /* Read the word at location addr in the USER area. */ 652 case PTRACE_PEEKUSR: { 653 struct pt_regs *regs; 654 union fpureg *fregs; 655 unsigned long tmp = 0; 656 657 regs = task_pt_regs(child); 658 ret = 0; /* Default return value. */ 659 660 switch (addr) { 661 case 0 ... 31: 662 tmp = regs->regs[addr]; 663 break; 664 case FPR_BASE ... FPR_BASE + 31: 665 if (!tsk_used_math(child)) { 666 /* FP not yet used */ 667 tmp = -1; 668 break; 669 } 670 fregs = get_fpu_regs(child); 671 672 #ifdef CONFIG_32BIT 673 if (test_thread_flag(TIF_32BIT_FPREGS)) { 674 /* 675 * The odd registers are actually the high 676 * order bits of the values stored in the even 677 * registers - unless we're using r2k_switch.S. 678 */ 679 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE], 680 addr & 1); 681 break; 682 } 683 #endif 684 tmp = get_fpr32(&fregs[addr - FPR_BASE], 0); 685 break; 686 case PC: 687 tmp = regs->cp0_epc; 688 break; 689 case CAUSE: 690 tmp = regs->cp0_cause; 691 break; 692 case BADVADDR: 693 tmp = regs->cp0_badvaddr; 694 break; 695 case MMHI: 696 tmp = regs->hi; 697 break; 698 case MMLO: 699 tmp = regs->lo; 700 break; 701 #ifdef CONFIG_CPU_HAS_SMARTMIPS 702 case ACX: 703 tmp = regs->acx; 704 break; 705 #endif 706 case FPC_CSR: 707 tmp = child->thread.fpu.fcr31; 708 break; 709 case FPC_EIR: 710 /* implementation / version register */ 711 tmp = boot_cpu_data.fpu_id; 712 break; 713 case DSP_BASE ... DSP_BASE + 5: { 714 dspreg_t *dregs; 715 716 if (!cpu_has_dsp) { 717 tmp = 0; 718 ret = -EIO; 719 goto out; 720 } 721 dregs = __get_dsp_regs(child); 722 tmp = (unsigned long) (dregs[addr - DSP_BASE]); 723 break; 724 } 725 case DSP_CONTROL: 726 if (!cpu_has_dsp) { 727 tmp = 0; 728 ret = -EIO; 729 goto out; 730 } 731 tmp = child->thread.dsp.dspcontrol; 732 break; 733 default: 734 tmp = 0; 735 ret = -EIO; 736 goto out; 737 } 738 ret = put_user(tmp, datalp); 739 break; 740 } 741 742 /* when I and D space are separate, this will have to be fixed. */ 743 case PTRACE_POKETEXT: /* write the word at location addr. */ 744 case PTRACE_POKEDATA: 745 ret = generic_ptrace_pokedata(child, addr, data); 746 break; 747 748 case PTRACE_POKEUSR: { 749 struct pt_regs *regs; 750 ret = 0; 751 regs = task_pt_regs(child); 752 753 switch (addr) { 754 case 0 ... 31: 755 regs->regs[addr] = data; 756 break; 757 case FPR_BASE ... FPR_BASE + 31: { 758 union fpureg *fregs = get_fpu_regs(child); 759 760 init_fp_ctx(child); 761 #ifdef CONFIG_32BIT 762 if (test_thread_flag(TIF_32BIT_FPREGS)) { 763 /* 764 * The odd registers are actually the high 765 * order bits of the values stored in the even 766 * registers - unless we're using r2k_switch.S. 767 */ 768 set_fpr32(&fregs[(addr & ~1) - FPR_BASE], 769 addr & 1, data); 770 break; 771 } 772 #endif 773 set_fpr64(&fregs[addr - FPR_BASE], 0, data); 774 break; 775 } 776 case PC: 777 regs->cp0_epc = data; 778 break; 779 case MMHI: 780 regs->hi = data; 781 break; 782 case MMLO: 783 regs->lo = data; 784 break; 785 #ifdef CONFIG_CPU_HAS_SMARTMIPS 786 case ACX: 787 regs->acx = data; 788 break; 789 #endif 790 case FPC_CSR: 791 init_fp_ctx(child); 792 ptrace_setfcr31(child, data); 793 break; 794 case DSP_BASE ... DSP_BASE + 5: { 795 dspreg_t *dregs; 796 797 if (!cpu_has_dsp) { 798 ret = -EIO; 799 break; 800 } 801 802 dregs = __get_dsp_regs(child); 803 dregs[addr - DSP_BASE] = data; 804 break; 805 } 806 case DSP_CONTROL: 807 if (!cpu_has_dsp) { 808 ret = -EIO; 809 break; 810 } 811 child->thread.dsp.dspcontrol = data; 812 break; 813 default: 814 /* The rest are not allowed. */ 815 ret = -EIO; 816 break; 817 } 818 break; 819 } 820 821 case PTRACE_GETREGS: 822 ret = ptrace_getregs(child, datavp); 823 break; 824 825 case PTRACE_SETREGS: 826 ret = ptrace_setregs(child, datavp); 827 break; 828 829 case PTRACE_GETFPREGS: 830 ret = ptrace_getfpregs(child, datavp); 831 break; 832 833 case PTRACE_SETFPREGS: 834 ret = ptrace_setfpregs(child, datavp); 835 break; 836 837 case PTRACE_GET_THREAD_AREA: 838 ret = put_user(task_thread_info(child)->tp_value, datalp); 839 break; 840 841 case PTRACE_GET_WATCH_REGS: 842 ret = ptrace_get_watch_regs(child, addrp); 843 break; 844 845 case PTRACE_SET_WATCH_REGS: 846 ret = ptrace_set_watch_regs(child, addrp); 847 break; 848 849 default: 850 ret = ptrace_request(child, request, addr, data); 851 break; 852 } 853 out: 854 return ret; 855 } 856 857 /* 858 * Notification of system call entry/exit 859 * - triggered by current->work.syscall_trace 860 */ 861 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall) 862 { 863 user_exit(); 864 865 current_thread_info()->syscall = syscall; 866 867 if (test_thread_flag(TIF_SYSCALL_TRACE) && 868 tracehook_report_syscall_entry(regs)) 869 return -1; 870 871 #ifdef CONFIG_SECCOMP 872 if (unlikely(test_thread_flag(TIF_SECCOMP))) { 873 int ret, i; 874 struct seccomp_data sd; 875 unsigned long args[6]; 876 877 sd.nr = syscall; 878 sd.arch = syscall_get_arch(); 879 syscall_get_arguments(current, regs, 0, 6, args); 880 for (i = 0; i < 6; i++) 881 sd.args[i] = args[i]; 882 sd.instruction_pointer = KSTK_EIP(current); 883 884 ret = __secure_computing(&sd); 885 if (ret == -1) 886 return ret; 887 } 888 #endif 889 890 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) 891 trace_sys_enter(regs, regs->regs[2]); 892 893 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5], 894 regs->regs[6], regs->regs[7]); 895 896 /* 897 * Negative syscall numbers are mistaken for rejected syscalls, but 898 * won't have had the return value set appropriately, so we do so now. 899 */ 900 if (syscall < 0) 901 syscall_set_return_value(current, regs, -ENOSYS, 0); 902 return syscall; 903 } 904 905 /* 906 * Notification of system call entry/exit 907 * - triggered by current->work.syscall_trace 908 */ 909 asmlinkage void syscall_trace_leave(struct pt_regs *regs) 910 { 911 /* 912 * We may come here right after calling schedule_user() 913 * or do_notify_resume(), in which case we can be in RCU 914 * user mode. 915 */ 916 user_exit(); 917 918 audit_syscall_exit(regs); 919 920 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) 921 trace_sys_exit(regs, regs_return_value(regs)); 922 923 if (test_thread_flag(TIF_SYSCALL_TRACE)) 924 tracehook_report_syscall_exit(regs, 0); 925 926 user_enter(); 927 } 928