arch/mips/kernel/ptrace.c

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This source file includes following definitions.
ptrace_disable
ptrace_getregs
ptrace_setregs
ptrace_get_watch_regs
ptrace_set_watch_regs
gpr32_get
gpr32_set
gpr64_get
gpr64_set
ptrace_setfcr31
ptrace_getfpregs
ptrace_setfpregs
fpr_get_fpa
fpr_get_msa
fpr_get
fpr_set_fpa
fpr_set_msa
fpr_set
fp_mode_get
fp_mode_set
copy_pad_fprs
msa_get
msa_set
dsp32_get
dsp32_set
dsp64_get
dsp64_set
dsp_active
regs_query_register_offset
task_user_regset_view
arch_ptrace
syscall_trace_enter
syscall_trace_leave
   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/processor.h>
  45 #include <asm/syscall.h>
  46 #include <linux/uaccess.h>
  47 #include <asm/bootinfo.h>
  48 #include <asm/reg.h>
  49 
  50 #define CREATE_TRACE_POINTS
  51 #include <trace/events/syscalls.h>
  52 
  53 /*
  54  * Called by kernel/ptrace.c when detaching..
  55  *
  56  * Make sure single step bits etc are not set.
  57  */
  58 void ptrace_disable(struct task_struct *child)
  59 {
  60         /* Don't load the watchpoint registers for the ex-child. */
  61         clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
  62 }
  63 
  64 /*
  65  * Read a general register set.  We always use the 64-bit format, even
  66  * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
  67  * Registers are sign extended to fill the available space.
  68  */
  69 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
  70 {
  71         struct pt_regs *regs;
  72         int i;
  73 
  74         if (!access_ok(data, 38 * 8))
  75                 return -EIO;
  76 
  77         regs = task_pt_regs(child);
  78 
  79         for (i = 0; i < 32; i++)
  80                 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
  81         __put_user((long)regs->lo, (__s64 __user *)&data->lo);
  82         __put_user((long)regs->hi, (__s64 __user *)&data->hi);
  83         __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
  84         __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
  85         __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
  86         __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
  87 
  88         return 0;
  89 }
  90 
  91 /*
  92  * Write a general register set.  As for PTRACE_GETREGS, we always use
  93  * the 64-bit format.  On a 32-bit kernel only the lower order half
  94  * (according to endianness) will be used.
  95  */
  96 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
  97 {
  98         struct pt_regs *regs;
  99         int i;
 100 
 101         if (!access_ok(data, 38 * 8))
 102                 return -EIO;
 103 
 104         regs = task_pt_regs(child);
 105 
 106         for (i = 0; i < 32; i++)
 107                 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
 108         __get_user(regs->lo, (__s64 __user *)&data->lo);
 109         __get_user(regs->hi, (__s64 __user *)&data->hi);
 110         __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
 111 
 112         /* badvaddr, status, and cause may not be written.  */
 113 
 114         /* System call number may have been changed */
 115         mips_syscall_update_nr(child, regs);
 116 
 117         return 0;
 118 }
 119 
 120 int ptrace_get_watch_regs(struct task_struct *child,
 121                           struct pt_watch_regs __user *addr)
 122 {
 123         enum pt_watch_style style;
 124         int i;
 125 
 126         if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
 127                 return -EIO;
 128         if (!access_ok(addr, sizeof(struct pt_watch_regs)))
 129                 return -EIO;
 130 
 131 #ifdef CONFIG_32BIT
 132         style = pt_watch_style_mips32;
 133 #define WATCH_STYLE mips32
 134 #else
 135         style = pt_watch_style_mips64;
 136 #define WATCH_STYLE mips64
 137 #endif
 138 
 139         __put_user(style, &addr->style);
 140         __put_user(boot_cpu_data.watch_reg_use_cnt,
 141                    &addr->WATCH_STYLE.num_valid);
 142         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 143                 __put_user(child->thread.watch.mips3264.watchlo[i],
 144                            &addr->WATCH_STYLE.watchlo[i]);
 145                 __put_user(child->thread.watch.mips3264.watchhi[i] &
 146                                 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
 147                            &addr->WATCH_STYLE.watchhi[i]);
 148                 __put_user(boot_cpu_data.watch_reg_masks[i],
 149                            &addr->WATCH_STYLE.watch_masks[i]);
 150         }
 151         for (; i < 8; i++) {
 152                 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
 153                 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
 154                 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
 155         }
 156 
 157         return 0;
 158 }
 159 
 160 int ptrace_set_watch_regs(struct task_struct *child,
 161                           struct pt_watch_regs __user *addr)
 162 {
 163         int i;
 164         int watch_active = 0;
 165         unsigned long lt[NUM_WATCH_REGS];
 166         u16 ht[NUM_WATCH_REGS];
 167 
 168         if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
 169                 return -EIO;
 170         if (!access_ok(addr, sizeof(struct pt_watch_regs)))
 171                 return -EIO;
 172         /* Check the values. */
 173         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 174                 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
 175 #ifdef CONFIG_32BIT
 176                 if (lt[i] & __UA_LIMIT)
 177                         return -EINVAL;
 178 #else
 179                 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
 180                         if (lt[i] & 0xffffffff80000000UL)
 181                                 return -EINVAL;
 182                 } else {
 183                         if (lt[i] & __UA_LIMIT)
 184                                 return -EINVAL;
 185                 }
 186 #endif
 187                 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
 188                 if (ht[i] & ~MIPS_WATCHHI_MASK)
 189                         return -EINVAL;
 190         }
 191         /* Install them. */
 192         for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
 193                 if (lt[i] & MIPS_WATCHLO_IRW)
 194                         watch_active = 1;
 195                 child->thread.watch.mips3264.watchlo[i] = lt[i];
 196                 /* Set the G bit. */
 197                 child->thread.watch.mips3264.watchhi[i] = ht[i];
 198         }
 199 
 200         if (watch_active)
 201                 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
 202         else
 203                 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
 204 
 205         return 0;
 206 }
 207 
 208 /* regset get/set implementations */
 209 
 210 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
 211 
 212 static int gpr32_get(struct task_struct *target,
 213                      const struct user_regset *regset,
 214                      unsigned int pos, unsigned int count,
 215                      void *kbuf, void __user *ubuf)
 216 {
 217         struct pt_regs *regs = task_pt_regs(target);
 218         u32 uregs[ELF_NGREG] = {};
 219 
 220         mips_dump_regs32(uregs, regs);
 221         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
 222                                    sizeof(uregs));
 223 }
 224 
 225 static int gpr32_set(struct task_struct *target,
 226                      const struct user_regset *regset,
 227                      unsigned int pos, unsigned int count,
 228                      const void *kbuf, const void __user *ubuf)
 229 {
 230         struct pt_regs *regs = task_pt_regs(target);
 231         u32 uregs[ELF_NGREG];
 232         unsigned start, num_regs, i;
 233         int err;
 234 
 235         start = pos / sizeof(u32);
 236         num_regs = count / sizeof(u32);
 237 
 238         if (start + num_regs > ELF_NGREG)
 239                 return -EIO;
 240 
 241         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
 242                                  sizeof(uregs));
 243         if (err)
 244                 return err;
 245 
 246         for (i = start; i < num_regs; i++) {
 247                 /*
 248                  * Cast all values to signed here so that if this is a 64-bit
 249                  * kernel, the supplied 32-bit values will be sign extended.
 250                  */
 251                 switch (i) {
 252                 case MIPS32_EF_R1 ... MIPS32_EF_R25:
 253                         /* k0/k1 are ignored. */
 254                 case MIPS32_EF_R28 ... MIPS32_EF_R31:
 255                         regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
 256                         break;
 257                 case MIPS32_EF_LO:
 258                         regs->lo = (s32)uregs[i];
 259                         break;
 260                 case MIPS32_EF_HI:
 261                         regs->hi = (s32)uregs[i];
 262                         break;
 263                 case MIPS32_EF_CP0_EPC:
 264                         regs->cp0_epc = (s32)uregs[i];
 265                         break;
 266                 }
 267         }
 268 
 269         /* System call number may have been changed */
 270         mips_syscall_update_nr(target, regs);
 271 
 272         return 0;
 273 }
 274 
 275 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
 276 
 277 #ifdef CONFIG_64BIT
 278 
 279 static int gpr64_get(struct task_struct *target,
 280                      const struct user_regset *regset,
 281                      unsigned int pos, unsigned int count,
 282                      void *kbuf, void __user *ubuf)
 283 {
 284         struct pt_regs *regs = task_pt_regs(target);
 285         u64 uregs[ELF_NGREG] = {};
 286 
 287         mips_dump_regs64(uregs, regs);
 288         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
 289                                    sizeof(uregs));
 290 }
 291 
 292 static int gpr64_set(struct task_struct *target,
 293                      const struct user_regset *regset,
 294                      unsigned int pos, unsigned int count,
 295                      const void *kbuf, const void __user *ubuf)
 296 {
 297         struct pt_regs *regs = task_pt_regs(target);
 298         u64 uregs[ELF_NGREG];
 299         unsigned start, num_regs, i;
 300         int err;
 301 
 302         start = pos / sizeof(u64);
 303         num_regs = count / sizeof(u64);
 304 
 305         if (start + num_regs > ELF_NGREG)
 306                 return -EIO;
 307 
 308         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
 309                                  sizeof(uregs));
 310         if (err)
 311                 return err;
 312 
 313         for (i = start; i < num_regs; i++) {
 314                 switch (i) {
 315                 case MIPS64_EF_R1 ... MIPS64_EF_R25:
 316                         /* k0/k1 are ignored. */
 317                 case MIPS64_EF_R28 ... MIPS64_EF_R31:
 318                         regs->regs[i - MIPS64_EF_R0] = uregs[i];
 319                         break;
 320                 case MIPS64_EF_LO:
 321                         regs->lo = uregs[i];
 322                         break;
 323                 case MIPS64_EF_HI:
 324                         regs->hi = uregs[i];
 325                         break;
 326                 case MIPS64_EF_CP0_EPC:
 327                         regs->cp0_epc = uregs[i];
 328                         break;
 329                 }
 330         }
 331 
 332         /* System call number may have been changed */
 333         mips_syscall_update_nr(target, regs);
 334 
 335         return 0;
 336 }
 337 
 338 #endif /* CONFIG_64BIT */
 339 
 340 
 341 #ifdef CONFIG_MIPS_FP_SUPPORT
 342 
 343 /*
 344  * Poke at FCSR according to its mask.  Set the Cause bits even
 345  * if a corresponding Enable bit is set.  This will be noticed at
 346  * the time the thread is switched to and SIGFPE thrown accordingly.
 347  */
 348 static void ptrace_setfcr31(struct task_struct *child, u32 value)
 349 {
 350         u32 fcr31;
 351         u32 mask;
 352 
 353         fcr31 = child->thread.fpu.fcr31;
 354         mask = boot_cpu_data.fpu_msk31;
 355         child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
 356 }
 357 
 358 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
 359 {
 360         int i;
 361 
 362         if (!access_ok(data, 33 * 8))
 363                 return -EIO;
 364 
 365         if (tsk_used_math(child)) {
 366                 union fpureg *fregs = get_fpu_regs(child);
 367                 for (i = 0; i < 32; i++)
 368                         __put_user(get_fpr64(&fregs[i], 0),
 369                                    i + (__u64 __user *)data);
 370         } else {
 371                 for (i = 0; i < 32; i++)
 372                         __put_user((__u64) -1, i + (__u64 __user *) data);
 373         }
 374 
 375         __put_user(child->thread.fpu.fcr31, data + 64);
 376         __put_user(boot_cpu_data.fpu_id, data + 65);
 377 
 378         return 0;
 379 }
 380 
 381 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
 382 {
 383         union fpureg *fregs;
 384         u64 fpr_val;
 385         u32 value;
 386         int i;
 387 
 388         if (!access_ok(data, 33 * 8))
 389                 return -EIO;
 390 
 391         init_fp_ctx(child);
 392         fregs = get_fpu_regs(child);
 393 
 394         for (i = 0; i < 32; i++) {
 395                 __get_user(fpr_val, i + (__u64 __user *)data);
 396                 set_fpr64(&fregs[i], 0, fpr_val);
 397         }
 398 
 399         __get_user(value, data + 64);
 400         ptrace_setfcr31(child, value);
 401 
 402         /* FIR may not be written.  */
 403 
 404         return 0;
 405 }
 406 
 407 /*
 408  * Copy the floating-point context to the supplied NT_PRFPREG buffer,
 409  * !CONFIG_CPU_HAS_MSA variant.  FP context's general register slots
 410  * correspond 1:1 to buffer slots.  Only general registers are copied.
 411  */
 412 static int fpr_get_fpa(struct task_struct *target,
 413                        unsigned int *pos, unsigned int *count,
 414                        void **kbuf, void __user **ubuf)
 415 {
 416         return user_regset_copyout(pos, count, kbuf, ubuf,
 417                                    &target->thread.fpu,
 418                                    0, NUM_FPU_REGS * sizeof(elf_fpreg_t));
 419 }
 420 
 421 /*
 422  * Copy the floating-point context to the supplied NT_PRFPREG buffer,
 423  * CONFIG_CPU_HAS_MSA variant.  Only lower 64 bits of FP context's
 424  * general register slots are copied to buffer slots.  Only general
 425  * registers are copied.
 426  */
 427 static int fpr_get_msa(struct task_struct *target,
 428                        unsigned int *pos, unsigned int *count,
 429                        void **kbuf, void __user **ubuf)
 430 {
 431         unsigned int i;
 432         u64 fpr_val;
 433         int err;
 434 
 435         BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
 436         for (i = 0; i < NUM_FPU_REGS; i++) {
 437                 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
 438                 err = user_regset_copyout(pos, count, kbuf, ubuf,
 439                                           &fpr_val, i * sizeof(elf_fpreg_t),
 440                                           (i + 1) * sizeof(elf_fpreg_t));
 441                 if (err)
 442                         return err;
 443         }
 444 
 445         return 0;
 446 }
 447 
 448 /*
 449  * Copy the floating-point context to the supplied NT_PRFPREG buffer.
 450  * Choose the appropriate helper for general registers, and then copy
 451  * the FCSR and FIR registers separately.
 452  */
 453 static int fpr_get(struct task_struct *target,
 454                    const struct user_regset *regset,
 455                    unsigned int pos, unsigned int count,
 456                    void *kbuf, void __user *ubuf)
 457 {
 458         const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t);
 459         const int fir_pos = fcr31_pos + sizeof(u32);
 460         int err;
 461 
 462         if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
 463                 err = fpr_get_fpa(target, &pos, &count, &kbuf, &ubuf);
 464         else
 465                 err = fpr_get_msa(target, &pos, &count, &kbuf, &ubuf);
 466         if (err)
 467                 return err;
 468 
 469         err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 470                                   &target->thread.fpu.fcr31,
 471                                   fcr31_pos, fcr31_pos + sizeof(u32));
 472         if (err)
 473                 return err;
 474 
 475         err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 476                                   &boot_cpu_data.fpu_id,
 477                                   fir_pos, fir_pos + sizeof(u32));
 478 
 479         return err;
 480 }
 481 
 482 /*
 483  * Copy the supplied NT_PRFPREG buffer to the floating-point context,
 484  * !CONFIG_CPU_HAS_MSA variant.   Buffer slots correspond 1:1 to FP
 485  * context's general register slots.  Only general registers are copied.
 486  */
 487 static int fpr_set_fpa(struct task_struct *target,
 488                        unsigned int *pos, unsigned int *count,
 489                        const void **kbuf, const void __user **ubuf)
 490 {
 491         return user_regset_copyin(pos, count, kbuf, ubuf,
 492                                   &target->thread.fpu,
 493                                   0, NUM_FPU_REGS * sizeof(elf_fpreg_t));
 494 }
 495 
 496 /*
 497  * Copy the supplied NT_PRFPREG buffer to the floating-point context,
 498  * CONFIG_CPU_HAS_MSA variant.  Buffer slots are copied to lower 64
 499  * bits only of FP context's general register slots.  Only general
 500  * registers are copied.
 501  */
 502 static int fpr_set_msa(struct task_struct *target,
 503                        unsigned int *pos, unsigned int *count,
 504                        const void **kbuf, const void __user **ubuf)
 505 {
 506         unsigned int i;
 507         u64 fpr_val;
 508         int err;
 509 
 510         BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
 511         for (i = 0; i < NUM_FPU_REGS && *count > 0; i++) {
 512                 err = user_regset_copyin(pos, count, kbuf, ubuf,
 513                                          &fpr_val, i * sizeof(elf_fpreg_t),
 514                                          (i + 1) * sizeof(elf_fpreg_t));
 515                 if (err)
 516                         return err;
 517                 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
 518         }
 519 
 520         return 0;
 521 }
 522 
 523 /*
 524  * Copy the supplied NT_PRFPREG buffer to the floating-point context.
 525  * Choose the appropriate helper for general registers, and then copy
 526  * the FCSR register separately.  Ignore the incoming FIR register
 527  * contents though, as the register is read-only.
 528  *
 529  * We optimize for the case where `count % sizeof(elf_fpreg_t) == 0',
 530  * which is supposed to have been guaranteed by the kernel before
 531  * calling us, e.g. in `ptrace_regset'.  We enforce that requirement,
 532  * so that we can safely avoid preinitializing temporaries for
 533  * partial register writes.
 534  */
 535 static int fpr_set(struct task_struct *target,
 536                    const struct user_regset *regset,
 537                    unsigned int pos, unsigned int count,
 538                    const void *kbuf, const void __user *ubuf)
 539 {
 540         const int fcr31_pos = NUM_FPU_REGS * sizeof(elf_fpreg_t);
 541         const int fir_pos = fcr31_pos + sizeof(u32);
 542         u32 fcr31;
 543         int err;
 544 
 545         BUG_ON(count % sizeof(elf_fpreg_t));
 546 
 547         if (pos + count > sizeof(elf_fpregset_t))
 548                 return -EIO;
 549 
 550         init_fp_ctx(target);
 551 
 552         if (sizeof(target->thread.fpu.fpr[0]) == sizeof(elf_fpreg_t))
 553                 err = fpr_set_fpa(target, &pos, &count, &kbuf, &ubuf);
 554         else
 555                 err = fpr_set_msa(target, &pos, &count, &kbuf, &ubuf);
 556         if (err)
 557                 return err;
 558 
 559         if (count > 0) {
 560                 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 561                                          &fcr31,
 562                                          fcr31_pos, fcr31_pos + sizeof(u32));
 563                 if (err)
 564                         return err;
 565 
 566                 ptrace_setfcr31(target, fcr31);
 567         }
 568 
 569         if (count > 0)
 570                 err = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 571                                                 fir_pos,
 572                                                 fir_pos + sizeof(u32));
 573 
 574         return err;
 575 }
 576 
 577 /* Copy the FP mode setting to the supplied NT_MIPS_FP_MODE buffer.  */
 578 static int fp_mode_get(struct task_struct *target,
 579                        const struct user_regset *regset,
 580                        unsigned int pos, unsigned int count,
 581                        void *kbuf, void __user *ubuf)
 582 {
 583         int fp_mode;
 584 
 585         fp_mode = mips_get_process_fp_mode(target);
 586         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
 587                                    sizeof(fp_mode));
 588 }
 589 
 590 /*
 591  * Copy the supplied NT_MIPS_FP_MODE buffer to the FP mode setting.
 592  *
 593  * We optimize for the case where `count % sizeof(int) == 0', which
 594  * is supposed to have been guaranteed by the kernel before calling
 595  * us, e.g. in `ptrace_regset'.  We enforce that requirement, so
 596  * that we can safely avoid preinitializing temporaries for partial
 597  * mode writes.
 598  */
 599 static int fp_mode_set(struct task_struct *target,
 600                        const struct user_regset *regset,
 601                        unsigned int pos, unsigned int count,
 602                        const void *kbuf, const void __user *ubuf)
 603 {
 604         int fp_mode;
 605         int err;
 606 
 607         BUG_ON(count % sizeof(int));
 608 
 609         if (pos + count > sizeof(fp_mode))
 610                 return -EIO;
 611 
 612         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fp_mode, 0,
 613                                  sizeof(fp_mode));
 614         if (err)
 615                 return err;
 616 
 617         if (count > 0)
 618                 err = mips_set_process_fp_mode(target, fp_mode);
 619 
 620         return err;
 621 }
 622 
 623 #endif /* CONFIG_MIPS_FP_SUPPORT */
 624 
 625 #ifdef CONFIG_CPU_HAS_MSA
 626 
 627 struct msa_control_regs {
 628         unsigned int fir;
 629         unsigned int fcsr;
 630         unsigned int msair;
 631         unsigned int msacsr;
 632 };
 633 
 634 static int copy_pad_fprs(struct task_struct *target,
 635                          const struct user_regset *regset,
 636                          unsigned int *ppos, unsigned int *pcount,
 637                          void **pkbuf, void __user **pubuf,
 638                          unsigned int live_sz)
 639 {
 640         int i, j, start, start_pad, err;
 641         unsigned long long fill = ~0ull;
 642         unsigned int cp_sz, pad_sz;
 643 
 644         cp_sz = min(regset->size, live_sz);
 645         pad_sz = regset->size - cp_sz;
 646         WARN_ON(pad_sz % sizeof(fill));
 647 
 648         i = start = err = 0;
 649         for (; i < NUM_FPU_REGS; i++, start += regset->size) {
 650                 err |= user_regset_copyout(ppos, pcount, pkbuf, pubuf,
 651                                            &target->thread.fpu.fpr[i],
 652                                            start, start + cp_sz);
 653 
 654                 start_pad = start + cp_sz;
 655                 for (j = 0; j < (pad_sz / sizeof(fill)); j++) {
 656                         err |= user_regset_copyout(ppos, pcount, pkbuf, pubuf,
 657                                                    &fill, start_pad,
 658                                                    start_pad + sizeof(fill));
 659                         start_pad += sizeof(fill);
 660                 }
 661         }
 662 
 663         return err;
 664 }
 665 
 666 static int msa_get(struct task_struct *target,
 667                    const struct user_regset *regset,
 668                    unsigned int pos, unsigned int count,
 669                    void *kbuf, void __user *ubuf)
 670 {
 671         const unsigned int wr_size = NUM_FPU_REGS * regset->size;
 672         const struct msa_control_regs ctrl_regs = {
 673                 .fir = boot_cpu_data.fpu_id,
 674                 .fcsr = target->thread.fpu.fcr31,
 675                 .msair = boot_cpu_data.msa_id,
 676                 .msacsr = target->thread.fpu.msacsr,
 677         };
 678         int err;
 679 
 680         if (!tsk_used_math(target)) {
 681                 /* The task hasn't used FP or MSA, fill with 0xff */
 682                 err = copy_pad_fprs(target, regset, &pos, &count,
 683                                     &kbuf, &ubuf, 0);
 684         } else if (!test_tsk_thread_flag(target, TIF_MSA_CTX_LIVE)) {
 685                 /* Copy scalar FP context, fill the rest with 0xff */
 686                 err = copy_pad_fprs(target, regset, &pos, &count,
 687                                     &kbuf, &ubuf, 8);
 688         } else if (sizeof(target->thread.fpu.fpr[0]) == regset->size) {
 689                 /* Trivially copy the vector registers */
 690                 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 691                                           &target->thread.fpu.fpr,
 692                                           0, wr_size);
 693         } else {
 694                 /* Copy as much context as possible, fill the rest with 0xff */
 695                 err = copy_pad_fprs(target, regset, &pos, &count,
 696                                     &kbuf, &ubuf,
 697                                     sizeof(target->thread.fpu.fpr[0]));
 698         }
 699 
 700         err |= user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 701                                    &ctrl_regs, wr_size,
 702                                    wr_size + sizeof(ctrl_regs));
 703         return err;
 704 }
 705 
 706 static int msa_set(struct task_struct *target,
 707                    const struct user_regset *regset,
 708                    unsigned int pos, unsigned int count,
 709                    const void *kbuf, const void __user *ubuf)
 710 {
 711         const unsigned int wr_size = NUM_FPU_REGS * regset->size;
 712         struct msa_control_regs ctrl_regs;
 713         unsigned int cp_sz;
 714         int i, err, start;
 715 
 716         init_fp_ctx(target);
 717 
 718         if (sizeof(target->thread.fpu.fpr[0]) == regset->size) {
 719                 /* Trivially copy the vector registers */
 720                 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 721                                          &target->thread.fpu.fpr,
 722                                          0, wr_size);
 723         } else {
 724                 /* Copy as much context as possible */
 725                 cp_sz = min_t(unsigned int, regset->size,
 726                               sizeof(target->thread.fpu.fpr[0]));
 727 
 728                 i = start = err = 0;
 729                 for (; i < NUM_FPU_REGS; i++, start += regset->size) {
 730                         err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 731                                                   &target->thread.fpu.fpr[i],
 732                                                   start, start + cp_sz);
 733                 }
 734         }
 735 
 736         if (!err)
 737                 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl_regs,
 738                                          wr_size, wr_size + sizeof(ctrl_regs));
 739         if (!err) {
 740                 target->thread.fpu.fcr31 = ctrl_regs.fcsr & ~FPU_CSR_ALL_X;
 741                 target->thread.fpu.msacsr = ctrl_regs.msacsr & ~MSA_CSR_CAUSEF;
 742         }
 743 
 744         return err;
 745 }
 746 
 747 #endif /* CONFIG_CPU_HAS_MSA */
 748 
 749 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
 750 
 751 /*
 752  * Copy the DSP context to the supplied 32-bit NT_MIPS_DSP buffer.
 753  */
 754 static int dsp32_get(struct task_struct *target,
 755                      const struct user_regset *regset,
 756                      unsigned int pos, unsigned int count,
 757                      void *kbuf, void __user *ubuf)
 758 {
 759         unsigned int start, num_regs, i;
 760         u32 dspregs[NUM_DSP_REGS + 1];
 761 
 762         BUG_ON(count % sizeof(u32));
 763 
 764         if (!cpu_has_dsp)
 765                 return -EIO;
 766 
 767         start = pos / sizeof(u32);
 768         num_regs = count / sizeof(u32);
 769 
 770         if (start + num_regs > NUM_DSP_REGS + 1)
 771                 return -EIO;
 772 
 773         for (i = start; i < num_regs; i++)
 774                 switch (i) {
 775                 case 0 ... NUM_DSP_REGS - 1:
 776                         dspregs[i] = target->thread.dsp.dspr[i];
 777                         break;
 778                 case NUM_DSP_REGS:
 779                         dspregs[i] = target->thread.dsp.dspcontrol;
 780                         break;
 781                 }
 782         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, dspregs, 0,
 783                                    sizeof(dspregs));
 784 }
 785 
 786 /*
 787  * Copy the supplied 32-bit NT_MIPS_DSP buffer to the DSP context.
 788  */
 789 static int dsp32_set(struct task_struct *target,
 790                      const struct user_regset *regset,
 791                      unsigned int pos, unsigned int count,
 792                      const void *kbuf, const void __user *ubuf)
 793 {
 794         unsigned int start, num_regs, i;
 795         u32 dspregs[NUM_DSP_REGS + 1];
 796         int err;
 797 
 798         BUG_ON(count % sizeof(u32));
 799 
 800         if (!cpu_has_dsp)
 801                 return -EIO;
 802 
 803         start = pos / sizeof(u32);
 804         num_regs = count / sizeof(u32);
 805 
 806         if (start + num_regs > NUM_DSP_REGS + 1)
 807                 return -EIO;
 808 
 809         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0,
 810                                  sizeof(dspregs));
 811         if (err)
 812                 return err;
 813 
 814         for (i = start; i < num_regs; i++)
 815                 switch (i) {
 816                 case 0 ... NUM_DSP_REGS - 1:
 817                         target->thread.dsp.dspr[i] = (s32)dspregs[i];
 818                         break;
 819                 case NUM_DSP_REGS:
 820                         target->thread.dsp.dspcontrol = (s32)dspregs[i];
 821                         break;
 822                 }
 823 
 824         return 0;
 825 }
 826 
 827 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
 828 
 829 #ifdef CONFIG_64BIT
 830 
 831 /*
 832  * Copy the DSP context to the supplied 64-bit NT_MIPS_DSP buffer.
 833  */
 834 static int dsp64_get(struct task_struct *target,
 835                      const struct user_regset *regset,
 836                      unsigned int pos, unsigned int count,
 837                      void *kbuf, void __user *ubuf)
 838 {
 839         unsigned int start, num_regs, i;
 840         u64 dspregs[NUM_DSP_REGS + 1];
 841 
 842         BUG_ON(count % sizeof(u64));
 843 
 844         if (!cpu_has_dsp)
 845                 return -EIO;
 846 
 847         start = pos / sizeof(u64);
 848         num_regs = count / sizeof(u64);
 849 
 850         if (start + num_regs > NUM_DSP_REGS + 1)
 851                 return -EIO;
 852 
 853         for (i = start; i < num_regs; i++)
 854                 switch (i) {
 855                 case 0 ... NUM_DSP_REGS - 1:
 856                         dspregs[i] = target->thread.dsp.dspr[i];
 857                         break;
 858                 case NUM_DSP_REGS:
 859                         dspregs[i] = target->thread.dsp.dspcontrol;
 860                         break;
 861                 }
 862         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, dspregs, 0,
 863                                    sizeof(dspregs));
 864 }
 865 
 866 /*
 867  * Copy the supplied 64-bit NT_MIPS_DSP buffer to the DSP context.
 868  */
 869 static int dsp64_set(struct task_struct *target,
 870                      const struct user_regset *regset,
 871                      unsigned int pos, unsigned int count,
 872                      const void *kbuf, const void __user *ubuf)
 873 {
 874         unsigned int start, num_regs, i;
 875         u64 dspregs[NUM_DSP_REGS + 1];
 876         int err;
 877 
 878         BUG_ON(count % sizeof(u64));
 879 
 880         if (!cpu_has_dsp)
 881                 return -EIO;
 882 
 883         start = pos / sizeof(u64);
 884         num_regs = count / sizeof(u64);
 885 
 886         if (start + num_regs > NUM_DSP_REGS + 1)
 887                 return -EIO;
 888 
 889         err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, dspregs, 0,
 890                                  sizeof(dspregs));
 891         if (err)
 892                 return err;
 893 
 894         for (i = start; i < num_regs; i++)
 895                 switch (i) {
 896                 case 0 ... NUM_DSP_REGS - 1:
 897                         target->thread.dsp.dspr[i] = dspregs[i];
 898                         break;
 899                 case NUM_DSP_REGS:
 900                         target->thread.dsp.dspcontrol = dspregs[i];
 901                         break;
 902                 }
 903 
 904         return 0;
 905 }
 906 
 907 #endif /* CONFIG_64BIT */
 908 
 909 /*
 910  * Determine whether the DSP context is present.
 911  */
 912 static int dsp_active(struct task_struct *target,
 913                       const struct user_regset *regset)
 914 {
 915         return cpu_has_dsp ? NUM_DSP_REGS + 1 : -ENODEV;
 916 }
 917 
 918 enum mips_regset {
 919         REGSET_GPR,
 920         REGSET_DSP,
 921 #ifdef CONFIG_MIPS_FP_SUPPORT
 922         REGSET_FPR,
 923         REGSET_FP_MODE,
 924 #endif
 925 #ifdef CONFIG_CPU_HAS_MSA
 926         REGSET_MSA,
 927 #endif
 928 };
 929 
 930 struct pt_regs_offset {
 931         const char *name;
 932         int offset;
 933 };
 934 
 935 #define REG_OFFSET_NAME(reg, r) {                                       \
 936         .name = #reg,                                                   \
 937         .offset = offsetof(struct pt_regs, r)                           \
 938 }
 939 
 940 #define REG_OFFSET_END {                                                \
 941         .name = NULL,                                                   \
 942         .offset = 0                                                     \
 943 }
 944 
 945 static const struct pt_regs_offset regoffset_table[] = {
 946         REG_OFFSET_NAME(r0, regs[0]),
 947         REG_OFFSET_NAME(r1, regs[1]),
 948         REG_OFFSET_NAME(r2, regs[2]),
 949         REG_OFFSET_NAME(r3, regs[3]),
 950         REG_OFFSET_NAME(r4, regs[4]),
 951         REG_OFFSET_NAME(r5, regs[5]),
 952         REG_OFFSET_NAME(r6, regs[6]),
 953         REG_OFFSET_NAME(r7, regs[7]),
 954         REG_OFFSET_NAME(r8, regs[8]),
 955         REG_OFFSET_NAME(r9, regs[9]),
 956         REG_OFFSET_NAME(r10, regs[10]),
 957         REG_OFFSET_NAME(r11, regs[11]),
 958         REG_OFFSET_NAME(r12, regs[12]),
 959         REG_OFFSET_NAME(r13, regs[13]),
 960         REG_OFFSET_NAME(r14, regs[14]),
 961         REG_OFFSET_NAME(r15, regs[15]),
 962         REG_OFFSET_NAME(r16, regs[16]),
 963         REG_OFFSET_NAME(r17, regs[17]),
 964         REG_OFFSET_NAME(r18, regs[18]),
 965         REG_OFFSET_NAME(r19, regs[19]),
 966         REG_OFFSET_NAME(r20, regs[20]),
 967         REG_OFFSET_NAME(r21, regs[21]),
 968         REG_OFFSET_NAME(r22, regs[22]),
 969         REG_OFFSET_NAME(r23, regs[23]),
 970         REG_OFFSET_NAME(r24, regs[24]),
 971         REG_OFFSET_NAME(r25, regs[25]),
 972         REG_OFFSET_NAME(r26, regs[26]),
 973         REG_OFFSET_NAME(r27, regs[27]),
 974         REG_OFFSET_NAME(r28, regs[28]),
 975         REG_OFFSET_NAME(r29, regs[29]),
 976         REG_OFFSET_NAME(r30, regs[30]),
 977         REG_OFFSET_NAME(r31, regs[31]),
 978         REG_OFFSET_NAME(c0_status, cp0_status),
 979         REG_OFFSET_NAME(hi, hi),
 980         REG_OFFSET_NAME(lo, lo),
 981 #ifdef CONFIG_CPU_HAS_SMARTMIPS
 982         REG_OFFSET_NAME(acx, acx),
 983 #endif
 984         REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
 985         REG_OFFSET_NAME(c0_cause, cp0_cause),
 986         REG_OFFSET_NAME(c0_epc, cp0_epc),
 987 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 988         REG_OFFSET_NAME(mpl0, mpl[0]),
 989         REG_OFFSET_NAME(mpl1, mpl[1]),
 990         REG_OFFSET_NAME(mpl2, mpl[2]),
 991         REG_OFFSET_NAME(mtp0, mtp[0]),
 992         REG_OFFSET_NAME(mtp1, mtp[1]),
 993         REG_OFFSET_NAME(mtp2, mtp[2]),
 994 #endif
 995         REG_OFFSET_END,
 996 };
 997 
 998 /**
 999  * regs_query_register_offset() - query register offset from its name
1000  * @name:       the name of a register
1001  *
1002  * regs_query_register_offset() returns the offset of a register in struct
1003  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1004  */
1005 int regs_query_register_offset(const char *name)
1006 {
1007         const struct pt_regs_offset *roff;
1008         for (roff = regoffset_table; roff->name != NULL; roff++)
1009                 if (!strcmp(roff->name, name))
1010                         return roff->offset;
1011         return -EINVAL;
1012 }
1013 
1014 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
1015 
1016 static const struct user_regset mips_regsets[] = {
1017         [REGSET_GPR] = {
1018                 .core_note_type = NT_PRSTATUS,
1019                 .n              = ELF_NGREG,
1020                 .size           = sizeof(unsigned int),
1021                 .align          = sizeof(unsigned int),
1022                 .get            = gpr32_get,
1023                 .set            = gpr32_set,
1024         },
1025         [REGSET_DSP] = {
1026                 .core_note_type = NT_MIPS_DSP,
1027                 .n              = NUM_DSP_REGS + 1,
1028                 .size           = sizeof(u32),
1029                 .align          = sizeof(u32),
1030                 .get            = dsp32_get,
1031                 .set            = dsp32_set,
1032                 .active         = dsp_active,
1033         },
1034 #ifdef CONFIG_MIPS_FP_SUPPORT
1035         [REGSET_FPR] = {
1036                 .core_note_type = NT_PRFPREG,
1037                 .n              = ELF_NFPREG,
1038                 .size           = sizeof(elf_fpreg_t),
1039                 .align          = sizeof(elf_fpreg_t),
1040                 .get            = fpr_get,
1041                 .set            = fpr_set,
1042         },
1043         [REGSET_FP_MODE] = {
1044                 .core_note_type = NT_MIPS_FP_MODE,
1045                 .n              = 1,
1046                 .size           = sizeof(int),
1047                 .align          = sizeof(int),
1048                 .get            = fp_mode_get,
1049                 .set            = fp_mode_set,
1050         },
1051 #endif
1052 #ifdef CONFIG_CPU_HAS_MSA
1053         [REGSET_MSA] = {
1054                 .core_note_type = NT_MIPS_MSA,
1055                 .n              = NUM_FPU_REGS + 1,
1056                 .size           = 16,
1057                 .align          = 16,
1058                 .get            = msa_get,
1059                 .set            = msa_set,
1060         },
1061 #endif
1062 };
1063 
1064 static const struct user_regset_view user_mips_view = {
1065         .name           = "mips",
1066         .e_machine      = ELF_ARCH,
1067         .ei_osabi       = ELF_OSABI,
1068         .regsets        = mips_regsets,
1069         .n              = ARRAY_SIZE(mips_regsets),
1070 };
1071 
1072 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
1073 
1074 #ifdef CONFIG_64BIT
1075 
1076 static const struct user_regset mips64_regsets[] = {
1077         [REGSET_GPR] = {
1078                 .core_note_type = NT_PRSTATUS,
1079                 .n              = ELF_NGREG,
1080                 .size           = sizeof(unsigned long),
1081                 .align          = sizeof(unsigned long),
1082                 .get            = gpr64_get,
1083                 .set            = gpr64_set,
1084         },
1085         [REGSET_DSP] = {
1086                 .core_note_type = NT_MIPS_DSP,
1087                 .n              = NUM_DSP_REGS + 1,
1088                 .size           = sizeof(u64),
1089                 .align          = sizeof(u64),
1090                 .get            = dsp64_get,
1091                 .set            = dsp64_set,
1092                 .active         = dsp_active,
1093         },
1094 #ifdef CONFIG_MIPS_FP_SUPPORT
1095         [REGSET_FP_MODE] = {
1096                 .core_note_type = NT_MIPS_FP_MODE,
1097                 .n              = 1,
1098                 .size           = sizeof(int),
1099                 .align          = sizeof(int),
1100                 .get            = fp_mode_get,
1101                 .set            = fp_mode_set,
1102         },
1103         [REGSET_FPR] = {
1104                 .core_note_type = NT_PRFPREG,
1105                 .n              = ELF_NFPREG,
1106                 .size           = sizeof(elf_fpreg_t),
1107                 .align          = sizeof(elf_fpreg_t),
1108                 .get            = fpr_get,
1109                 .set            = fpr_set,
1110         },
1111 #endif
1112 #ifdef CONFIG_CPU_HAS_MSA
1113         [REGSET_MSA] = {
1114                 .core_note_type = NT_MIPS_MSA,
1115                 .n              = NUM_FPU_REGS + 1,
1116                 .size           = 16,
1117                 .align          = 16,
1118                 .get            = msa_get,
1119                 .set            = msa_set,
1120         },
1121 #endif
1122 };
1123 
1124 static const struct user_regset_view user_mips64_view = {
1125         .name           = "mips64",
1126         .e_machine      = ELF_ARCH,
1127         .ei_osabi       = ELF_OSABI,
1128         .regsets        = mips64_regsets,
1129         .n              = ARRAY_SIZE(mips64_regsets),
1130 };
1131 
1132 #ifdef CONFIG_MIPS32_N32
1133 
1134 static const struct user_regset_view user_mipsn32_view = {
1135         .name           = "mipsn32",
1136         .e_flags        = EF_MIPS_ABI2,
1137         .e_machine      = ELF_ARCH,
1138         .ei_osabi       = ELF_OSABI,
1139         .regsets        = mips64_regsets,
1140         .n              = ARRAY_SIZE(mips64_regsets),
1141 };
1142 
1143 #endif /* CONFIG_MIPS32_N32 */
1144 
1145 #endif /* CONFIG_64BIT */
1146 
1147 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1148 {
1149 #ifdef CONFIG_32BIT
1150         return &user_mips_view;
1151 #else
1152 #ifdef CONFIG_MIPS32_O32
1153         if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
1154                 return &user_mips_view;
1155 #endif
1156 #ifdef CONFIG_MIPS32_N32
1157         if (test_tsk_thread_flag(task, TIF_32BIT_ADDR))
1158                 return &user_mipsn32_view;
1159 #endif
1160         return &user_mips64_view;
1161 #endif
1162 }
1163 
1164 long arch_ptrace(struct task_struct *child, long request,
1165                  unsigned long addr, unsigned long data)
1166 {
1167         int ret;
1168         void __user *addrp = (void __user *) addr;
1169         void __user *datavp = (void __user *) data;
1170         unsigned long __user *datalp = (void __user *) data;
1171 
1172         switch (request) {
1173         /* when I and D space are separate, these will need to be fixed. */
1174         case PTRACE_PEEKTEXT: /* read word at location addr. */
1175         case PTRACE_PEEKDATA:
1176                 ret = generic_ptrace_peekdata(child, addr, data);
1177                 break;
1178 
1179         /* Read the word at location addr in the USER area. */
1180         case PTRACE_PEEKUSR: {
1181                 struct pt_regs *regs;
1182                 unsigned long tmp = 0;
1183 
1184                 regs = task_pt_regs(child);
1185                 ret = 0;  /* Default return value. */
1186 
1187                 switch (addr) {
1188                 case 0 ... 31:
1189                         tmp = regs->regs[addr];
1190                         break;
1191 #ifdef CONFIG_MIPS_FP_SUPPORT
1192                 case FPR_BASE ... FPR_BASE + 31: {
1193                         union fpureg *fregs;
1194 
1195                         if (!tsk_used_math(child)) {
1196                                 /* FP not yet used */
1197                                 tmp = -1;
1198                                 break;
1199                         }
1200                         fregs = get_fpu_regs(child);
1201 
1202 #ifdef CONFIG_32BIT
1203                         if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1204                                 /*
1205                                  * The odd registers are actually the high
1206                                  * order bits of the values stored in the even
1207                                  * registers.
1208                                  */
1209                                 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1210                                                 addr & 1);
1211                                 break;
1212                         }
1213 #endif
1214                         tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
1215                         break;
1216                 }
1217                 case FPC_CSR:
1218                         tmp = child->thread.fpu.fcr31;
1219                         break;
1220                 case FPC_EIR:
1221                         /* implementation / version register */
1222                         tmp = boot_cpu_data.fpu_id;
1223                         break;
1224 #endif
1225                 case PC:
1226                         tmp = regs->cp0_epc;
1227                         break;
1228                 case CAUSE:
1229                         tmp = regs->cp0_cause;
1230                         break;
1231                 case BADVADDR:
1232                         tmp = regs->cp0_badvaddr;
1233                         break;
1234                 case MMHI:
1235                         tmp = regs->hi;
1236                         break;
1237                 case MMLO:
1238                         tmp = regs->lo;
1239                         break;
1240 #ifdef CONFIG_CPU_HAS_SMARTMIPS
1241                 case ACX:
1242                         tmp = regs->acx;
1243                         break;
1244 #endif
1245                 case DSP_BASE ... DSP_BASE + 5: {
1246                         dspreg_t *dregs;
1247 
1248                         if (!cpu_has_dsp) {
1249                                 tmp = 0;
1250                                 ret = -EIO;
1251                                 goto out;
1252                         }
1253                         dregs = __get_dsp_regs(child);
1254                         tmp = dregs[addr - DSP_BASE];
1255                         break;
1256                 }
1257                 case DSP_CONTROL:
1258                         if (!cpu_has_dsp) {
1259                                 tmp = 0;
1260                                 ret = -EIO;
1261                                 goto out;
1262                         }
1263                         tmp = child->thread.dsp.dspcontrol;
1264                         break;
1265                 default:
1266                         tmp = 0;
1267                         ret = -EIO;
1268                         goto out;
1269                 }
1270                 ret = put_user(tmp, datalp);
1271                 break;
1272         }
1273 
1274         /* when I and D space are separate, this will have to be fixed. */
1275         case PTRACE_POKETEXT: /* write the word at location addr. */
1276         case PTRACE_POKEDATA:
1277                 ret = generic_ptrace_pokedata(child, addr, data);
1278                 break;
1279 
1280         case PTRACE_POKEUSR: {
1281                 struct pt_regs *regs;
1282                 ret = 0;
1283                 regs = task_pt_regs(child);
1284 
1285                 switch (addr) {
1286                 case 0 ... 31:
1287                         regs->regs[addr] = data;
1288                         /* System call number may have been changed */
1289                         if (addr == 2)
1290                                 mips_syscall_update_nr(child, regs);
1291                         else if (addr == 4 &&
1292                                  mips_syscall_is_indirect(child, regs))
1293                                 mips_syscall_update_nr(child, regs);
1294                         break;
1295 #ifdef CONFIG_MIPS_FP_SUPPORT
1296                 case FPR_BASE ... FPR_BASE + 31: {
1297                         union fpureg *fregs = get_fpu_regs(child);
1298 
1299                         init_fp_ctx(child);
1300 #ifdef CONFIG_32BIT
1301                         if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
1302                                 /*
1303                                  * The odd registers are actually the high
1304                                  * order bits of the values stored in the even
1305                                  * registers.
1306                                  */
1307                                 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
1308                                           addr & 1, data);
1309                                 break;
1310                         }
1311 #endif
1312                         set_fpr64(&fregs[addr - FPR_BASE], 0, data);
1313                         break;
1314                 }
1315                 case FPC_CSR:
1316                         init_fp_ctx(child);
1317                         ptrace_setfcr31(child, data);
1318                         break;
1319 #endif
1320                 case PC:
1321                         regs->cp0_epc = data;
1322                         break;
1323                 case MMHI:
1324                         regs->hi = data;
1325                         break;
1326                 case MMLO:
1327                         regs->lo = data;
1328                         break;
1329 #ifdef CONFIG_CPU_HAS_SMARTMIPS
1330                 case ACX:
1331                         regs->acx = data;
1332                         break;
1333 #endif
1334                 case DSP_BASE ... DSP_BASE + 5: {
1335                         dspreg_t *dregs;
1336 
1337                         if (!cpu_has_dsp) {
1338                                 ret = -EIO;
1339                                 break;
1340                         }
1341 
1342                         dregs = __get_dsp_regs(child);
1343                         dregs[addr - DSP_BASE] = data;
1344                         break;
1345                 }
1346                 case DSP_CONTROL:
1347                         if (!cpu_has_dsp) {
1348                                 ret = -EIO;
1349                                 break;
1350                         }
1351                         child->thread.dsp.dspcontrol = data;
1352                         break;
1353                 default:
1354                         /* The rest are not allowed. */
1355                         ret = -EIO;
1356                         break;
1357                 }
1358                 break;
1359                 }
1360 
1361         case PTRACE_GETREGS:
1362                 ret = ptrace_getregs(child, datavp);
1363                 break;
1364 
1365         case PTRACE_SETREGS:
1366                 ret = ptrace_setregs(child, datavp);
1367                 break;
1368 
1369 #ifdef CONFIG_MIPS_FP_SUPPORT
1370         case PTRACE_GETFPREGS:
1371                 ret = ptrace_getfpregs(child, datavp);
1372                 break;
1373 
1374         case PTRACE_SETFPREGS:
1375                 ret = ptrace_setfpregs(child, datavp);
1376                 break;
1377 #endif
1378         case PTRACE_GET_THREAD_AREA:
1379                 ret = put_user(task_thread_info(child)->tp_value, datalp);
1380                 break;
1381 
1382         case PTRACE_GET_WATCH_REGS:
1383                 ret = ptrace_get_watch_regs(child, addrp);
1384                 break;
1385 
1386         case PTRACE_SET_WATCH_REGS:
1387                 ret = ptrace_set_watch_regs(child, addrp);
1388                 break;
1389 
1390         default:
1391                 ret = ptrace_request(child, request, addr, data);
1392                 break;
1393         }
1394  out:
1395         return ret;
1396 }
1397 
1398 /*
1399  * Notification of system call entry/exit
1400  * - triggered by current->work.syscall_trace
1401  */
1402 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
1403 {
1404         user_exit();
1405 
1406         current_thread_info()->syscall = syscall;
1407 
1408         if (test_thread_flag(TIF_SYSCALL_TRACE)) {
1409                 if (tracehook_report_syscall_entry(regs))
1410                         return -1;
1411                 syscall = current_thread_info()->syscall;
1412         }
1413 
1414 #ifdef CONFIG_SECCOMP
1415         if (unlikely(test_thread_flag(TIF_SECCOMP))) {
1416                 int ret, i;
1417                 struct seccomp_data sd;
1418                 unsigned long args[6];
1419 
1420                 sd.nr = syscall;
1421                 sd.arch = syscall_get_arch(current);
1422                 syscall_get_arguments(current, regs, args);
1423                 for (i = 0; i < 6; i++)
1424                         sd.args[i] = args[i];
1425                 sd.instruction_pointer = KSTK_EIP(current);
1426 
1427                 ret = __secure_computing(&sd);
1428                 if (ret == -1)
1429                         return ret;
1430                 syscall = current_thread_info()->syscall;
1431         }
1432 #endif
1433 
1434         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1435                 trace_sys_enter(regs, regs->regs[2]);
1436 
1437         audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
1438                             regs->regs[6], regs->regs[7]);
1439 
1440         /*
1441          * Negative syscall numbers are mistaken for rejected syscalls, but
1442          * won't have had the return value set appropriately, so we do so now.
1443          */
1444         if (syscall < 0)
1445                 syscall_set_return_value(current, regs, -ENOSYS, 0);
1446         return syscall;
1447 }
1448 
1449 /*
1450  * Notification of system call entry/exit
1451  * - triggered by current->work.syscall_trace
1452  */
1453 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1454 {
1455         /*
1456          * We may come here right after calling schedule_user()
1457          * or do_notify_resume(), in which case we can be in RCU
1458          * user mode.
1459          */
1460         user_exit();
1461 
1462         audit_syscall_exit(regs);
1463 
1464         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1465                 trace_sys_exit(regs, regs_return_value(regs));
1466 
1467         if (test_thread_flag(TIF_SYSCALL_TRACE))
1468                 tracehook_report_syscall_exit(regs, 0);
1469 
1470         user_enter();
1471 }
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root/arch/mips/kernel/ptrace.c

DEFINITIONS
