arch/powerpc/kernel/ptrace.c

   1 /*
   2  *  PowerPC version
   3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   4  *
   5  *  Derived from "arch/m68k/kernel/ptrace.c"
   6  *  Copyright (C) 1994 by Hamish Macdonald
   7  *  Taken from linux/kernel/ptrace.c and modified for M680x0.
   8  *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
   9  *
  10  * Modified by Cort Dougan (cort@hq.fsmlabs.com)
  11  * and Paul Mackerras (paulus@samba.org).
  12  *
  13  * This file is subject to the terms and conditions of the GNU General
  14  * Public License.  See the file README.legal in the main directory of
  15  * this archive for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/mm.h>
  21 #include <linux/smp.h>
  22 #include <linux/errno.h>
  23 #include <linux/ptrace.h>
  24 #include <linux/regset.h>
  25 #include <linux/tracehook.h>
  26 #include <linux/elf.h>
  27 #include <linux/user.h>
  28 #include <linux/security.h>
  29 #include <linux/signal.h>
  30 #include <linux/seccomp.h>
  31 #include <linux/audit.h>
  32 #include <trace/syscall.h>
  33 #include <linux/hw_breakpoint.h>
  34 #include <linux/perf_event.h>
  35 #include <linux/context_tracking.h>
  36
  37 #include <asm/uaccess.h>
  38 #include <asm/page.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/switch_to.h>
  41
  42 #define CREATE_TRACE_POINTS
  43 #include <trace/events/syscalls.h>
  44
  45 /*
  46  * The parameter save area on the stack is used to store arguments being passed
  47  * to callee function and is located at fixed offset from stack pointer.
  48  */
  49 #ifdef CONFIG_PPC32
  50 #define PARAMETER_SAVE_AREA_OFFSET      24  /* bytes */
  51 #else /* CONFIG_PPC32 */
  52 #define PARAMETER_SAVE_AREA_OFFSET      48  /* bytes */
  53 #endif
  54
  55 struct pt_regs_offset {
  56         const char *name;
  57         int offset;
  58 };
  59
  60 #define STR(s)  #s                      /* convert to string */
  61 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
  62 #define GPR_OFFSET_NAME(num)    \
  63         {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
  64 #define REG_OFFSET_END {.name = NULL, .offset = 0}
  65
  66 static const struct pt_regs_offset regoffset_table[] = {
  67         GPR_OFFSET_NAME(0),
  68         GPR_OFFSET_NAME(1),
  69         GPR_OFFSET_NAME(2),
  70         GPR_OFFSET_NAME(3),
  71         GPR_OFFSET_NAME(4),
  72         GPR_OFFSET_NAME(5),
  73         GPR_OFFSET_NAME(6),
  74         GPR_OFFSET_NAME(7),
  75         GPR_OFFSET_NAME(8),
  76         GPR_OFFSET_NAME(9),
  77         GPR_OFFSET_NAME(10),
  78         GPR_OFFSET_NAME(11),
  79         GPR_OFFSET_NAME(12),
  80         GPR_OFFSET_NAME(13),
  81         GPR_OFFSET_NAME(14),
  82         GPR_OFFSET_NAME(15),
  83         GPR_OFFSET_NAME(16),
  84         GPR_OFFSET_NAME(17),
  85         GPR_OFFSET_NAME(18),
  86         GPR_OFFSET_NAME(19),
  87         GPR_OFFSET_NAME(20),
  88         GPR_OFFSET_NAME(21),
  89         GPR_OFFSET_NAME(22),
  90         GPR_OFFSET_NAME(23),
  91         GPR_OFFSET_NAME(24),
  92         GPR_OFFSET_NAME(25),
  93         GPR_OFFSET_NAME(26),
  94         GPR_OFFSET_NAME(27),
  95         GPR_OFFSET_NAME(28),
  96         GPR_OFFSET_NAME(29),
  97         GPR_OFFSET_NAME(30),
  98         GPR_OFFSET_NAME(31),
  99         REG_OFFSET_NAME(nip),
 100         REG_OFFSET_NAME(msr),
 101         REG_OFFSET_NAME(ctr),
 102         REG_OFFSET_NAME(link),
 103         REG_OFFSET_NAME(xer),
 104         REG_OFFSET_NAME(ccr),
 105 #ifdef CONFIG_PPC64
 106         REG_OFFSET_NAME(softe),
 107 #else
 108         REG_OFFSET_NAME(mq),
 109 #endif
 110         REG_OFFSET_NAME(trap),
 111         REG_OFFSET_NAME(dar),
 112         REG_OFFSET_NAME(dsisr),
 113         REG_OFFSET_END,
 114 };
 115
 116 /**
 117  * regs_query_register_offset() - query register offset from its name
 118  * @name:       the name of a register
 119  *
 120  * regs_query_register_offset() returns the offset of a register in struct
 121  * pt_regs from its name. If the name is invalid, this returns -EINVAL;
 122  */
 123 int regs_query_register_offset(const char *name)
 124 {
 125         const struct pt_regs_offset *roff;
 126         for (roff = regoffset_table; roff->name != NULL; roff++)
 127                 if (!strcmp(roff->name, name))
 128                         return roff->offset;
 129         return -EINVAL;
 130 }
 131
 132 /**
 133  * regs_query_register_name() - query register name from its offset
 134  * @offset:     the offset of a register in struct pt_regs.
 135  *
 136  * regs_query_register_name() returns the name of a register from its
 137  * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
 138  */
 139 const char *regs_query_register_name(unsigned int offset)
 140 {
 141         const struct pt_regs_offset *roff;
 142         for (roff = regoffset_table; roff->name != NULL; roff++)
 143                 if (roff->offset == offset)
 144                         return roff->name;
 145         return NULL;
 146 }
 147
 148 /*
 149  * does not yet catch signals sent when the child dies.
 150  * in exit.c or in signal.c.
 151  */
 152
 153 /*
 154  * Set of msr bits that gdb can change on behalf of a process.
 155  */
 156 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 157 #define MSR_DEBUGCHANGE 0
 158 #else
 159 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
 160 #endif
 161
 162 /*
 163  * Max register writeable via put_reg
 164  */
 165 #ifdef CONFIG_PPC32
 166 #define PT_MAX_PUT_REG  PT_MQ
 167 #else
 168 #define PT_MAX_PUT_REG  PT_CCR
 169 #endif
 170
 171 static unsigned long get_user_msr(struct task_struct *task)
 172 {
 173         return task->thread.regs->msr | task->thread.fpexc_mode;
 174 }
 175
 176 static int set_user_msr(struct task_struct *task, unsigned long msr)
 177 {
 178         task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
 179         task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
 180         return 0;
 181 }
 182
 183 #ifdef CONFIG_PPC64
 184 static int get_user_dscr(struct task_struct *task, unsigned long *data)
 185 {
 186         *data = task->thread.dscr;
 187         return 0;
 188 }
 189
 190 static int set_user_dscr(struct task_struct *task, unsigned long dscr)
 191 {
 192         task->thread.dscr = dscr;
 193         task->thread.dscr_inherit = 1;
 194         return 0;
 195 }
 196 #else
 197 static int get_user_dscr(struct task_struct *task, unsigned long *data)
 198 {
 199         return -EIO;
 200 }
 201
 202 static int set_user_dscr(struct task_struct *task, unsigned long dscr)
 203 {
 204         return -EIO;
 205 }
 206 #endif
 207
 208 /*
 209  * We prevent mucking around with the reserved area of trap
 210  * which are used internally by the kernel.
 211  */
 212 static int set_user_trap(struct task_struct *task, unsigned long trap)
 213 {
 214         task->thread.regs->trap = trap & 0xfff0;
 215         return 0;
 216 }
 217
 218 /*
 219  * Get contents of register REGNO in task TASK.
 220  */
 221 int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data)
 222 {
 223         if ((task->thread.regs == NULL) || !data)
 224                 return -EIO;
 225
 226         if (regno == PT_MSR) {
 227                 *data = get_user_msr(task);
 228                 return 0;
 229         }
 230
 231         if (regno == PT_DSCR)
 232                 return get_user_dscr(task, data);
 233
 234         if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long))) {
 235                 *data = ((unsigned long *)task->thread.regs)[regno];
 236                 return 0;
 237         }
 238
 239         return -EIO;
 240 }
 241
 242 /*
 243  * Write contents of register REGNO in task TASK.
 244  */
 245 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
 246 {
 247         if (task->thread.regs == NULL)
 248                 return -EIO;
 249
 250         if (regno == PT_MSR)
 251                 return set_user_msr(task, data);
 252         if (regno == PT_TRAP)
 253                 return set_user_trap(task, data);
 254         if (regno == PT_DSCR)
 255                 return set_user_dscr(task, data);
 256
 257         if (regno <= PT_MAX_PUT_REG) {
 258                 ((unsigned long *)task->thread.regs)[regno] = data;
 259                 return 0;
 260         }
 261         return -EIO;
 262 }
 263
 264 static int gpr_get(struct task_struct *target, const struct user_regset *regset,
 265                    unsigned int pos, unsigned int count,
 266                    void *kbuf, void __user *ubuf)
 267 {
 268         int i, ret;
 269
 270         if (target->thread.regs == NULL)
 271                 return -EIO;
 272
 273         if (!FULL_REGS(target->thread.regs)) {
 274                 /* We have a partial register set.  Fill 14-31 with bogus values */
 275                 for (i = 14; i < 32; i++)
 276                         target->thread.regs->gpr[i] = NV_REG_POISON;
 277         }
 278
 279         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 280                                   target->thread.regs,
 281                                   0, offsetof(struct pt_regs, msr));
 282         if (!ret) {
 283                 unsigned long msr = get_user_msr(target);
 284                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
 285                                           offsetof(struct pt_regs, msr),
 286                                           offsetof(struct pt_regs, msr) +
 287                                           sizeof(msr));
 288         }
 289
 290         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
 291                      offsetof(struct pt_regs, msr) + sizeof(long));
 292
 293         if (!ret)
 294                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 295                                           &target->thread.regs->orig_gpr3,
 296                                           offsetof(struct pt_regs, orig_gpr3),
 297                                           sizeof(struct pt_regs));
 298         if (!ret)
 299                 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 300                                                sizeof(struct pt_regs), -1);
 301
 302         return ret;
 303 }
 304
 305 static int gpr_set(struct task_struct *target, const struct user_regset *regset,
 306                    unsigned int pos, unsigned int count,
 307                    const void *kbuf, const void __user *ubuf)
 308 {
 309         unsigned long reg;
 310         int ret;
 311
 312         if (target->thread.regs == NULL)
 313                 return -EIO;
 314
 315         CHECK_FULL_REGS(target->thread.regs);
 316
 317         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 318                                  target->thread.regs,
 319                                  0, PT_MSR * sizeof(reg));
 320
 321         if (!ret && count > 0) {
 322                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 323                                          PT_MSR * sizeof(reg),
 324                                          (PT_MSR + 1) * sizeof(reg));
 325                 if (!ret)
 326                         ret = set_user_msr(target, reg);
 327         }
 328
 329         BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
 330                      offsetof(struct pt_regs, msr) + sizeof(long));
 331
 332         if (!ret)
 333                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 334                                          &target->thread.regs->orig_gpr3,
 335                                          PT_ORIG_R3 * sizeof(reg),
 336                                          (PT_MAX_PUT_REG + 1) * sizeof(reg));
 337
 338         if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
 339                 ret = user_regset_copyin_ignore(
 340                         &pos, &count, &kbuf, &ubuf,
 341                         (PT_MAX_PUT_REG + 1) * sizeof(reg),
 342                         PT_TRAP * sizeof(reg));
 343
 344         if (!ret && count > 0) {
 345                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &reg,
 346                                          PT_TRAP * sizeof(reg),
 347                                          (PT_TRAP + 1) * sizeof(reg));
 348                 if (!ret)
 349                         ret = set_user_trap(target, reg);
 350         }
 351
 352         if (!ret)
 353                 ret = user_regset_copyin_ignore(
 354                         &pos, &count, &kbuf, &ubuf,
 355                         (PT_TRAP + 1) * sizeof(reg), -1);
 356
 357         return ret;
 358 }
 359
 360 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
 361                    unsigned int pos, unsigned int count,
 362                    void *kbuf, void __user *ubuf)
 363 {
 364 #ifdef CONFIG_VSX
 365         u64 buf[33];
 366         int i;
 367 #endif
 368         flush_fp_to_thread(target);
 369
 370 #ifdef CONFIG_VSX
 371         /* copy to local buffer then write that out */
 372         for (i = 0; i < 32 ; i++)
 373                 buf[i] = target->thread.TS_FPR(i);
 374         buf[32] = target->thread.fp_state.fpscr;
 375         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
 376
 377 #else
 378         BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
 379                      offsetof(struct thread_fp_state, fpr[32][0]));
 380
 381         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 382                                    &target->thread.fp_state, 0, -1);
 383 #endif
 384 }
 385
 386 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
 387                    unsigned int pos, unsigned int count,
 388                    const void *kbuf, const void __user *ubuf)
 389 {
 390 #ifdef CONFIG_VSX
 391         u64 buf[33];
 392         int i;
 393 #endif
 394         flush_fp_to_thread(target);
 395
 396 #ifdef CONFIG_VSX
 397         /* copy to local buffer then write that out */
 398         i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
 399         if (i)
 400                 return i;
 401         for (i = 0; i < 32 ; i++)
 402                 target->thread.TS_FPR(i) = buf[i];
 403         target->thread.fp_state.fpscr = buf[32];
 404         return 0;
 405 #else
 406         BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
 407                      offsetof(struct thread_fp_state, fpr[32][0]));
 408
 409         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 410                                   &target->thread.fp_state, 0, -1);
 411 #endif
 412 }
 413
 414 #ifdef CONFIG_ALTIVEC
 415 /*
 416  * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
 417  * The transfer totals 34 quadword.  Quadwords 0-31 contain the
 418  * corresponding vector registers.  Quadword 32 contains the vscr as the
 419  * last word (offset 12) within that quadword.  Quadword 33 contains the
 420  * vrsave as the first word (offset 0) within the quadword.
 421  *
 422  * This definition of the VMX state is compatible with the current PPC32
 423  * ptrace interface.  This allows signal handling and ptrace to use the
 424  * same structures.  This also simplifies the implementation of a bi-arch
 425  * (combined (32- and 64-bit) gdb.
 426  */
 427
 428 static int vr_active(struct task_struct *target,
 429                      const struct user_regset *regset)
 430 {
 431         flush_altivec_to_thread(target);
 432         return target->thread.used_vr ? regset->n : 0;
 433 }
 434
 435 static int vr_get(struct task_struct *target, const struct user_regset *regset,
 436                   unsigned int pos, unsigned int count,
 437                   void *kbuf, void __user *ubuf)
 438 {
 439         int ret;
 440
 441         flush_altivec_to_thread(target);
 442
 443         BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) !=
 444                      offsetof(struct thread_vr_state, vr[32]));
 445
 446         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 447                                   &target->thread.vr_state, 0,
 448                                   33 * sizeof(vector128));
 449         if (!ret) {
 450                 /*
 451                  * Copy out only the low-order word of vrsave.
 452                  */
 453                 union {
 454                         elf_vrreg_t reg;
 455                         u32 word;
 456                 } vrsave;
 457                 memset(&vrsave, 0, sizeof(vrsave));
 458                 vrsave.word = target->thread.vrsave;
 459                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
 460                                           33 * sizeof(vector128), -1);
 461         }
 462
 463         return ret;
 464 }
 465
 466 static int vr_set(struct task_struct *target, const struct user_regset *regset,
 467                   unsigned int pos, unsigned int count,
 468                   const void *kbuf, const void __user *ubuf)
 469 {
 470         int ret;
 471
 472         flush_altivec_to_thread(target);
 473
 474         BUILD_BUG_ON(offsetof(struct thread_vr_state, vscr) !=
 475                      offsetof(struct thread_vr_state, vr[32]));
 476
 477         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 478                                  &target->thread.vr_state, 0,
 479                                  33 * sizeof(vector128));
 480         if (!ret && count > 0) {
 481                 /*
 482                  * We use only the first word of vrsave.
 483                  */
 484                 union {
 485                         elf_vrreg_t reg;
 486                         u32 word;
 487                 } vrsave;
 488                 memset(&vrsave, 0, sizeof(vrsave));
 489                 vrsave.word = target->thread.vrsave;
 490                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
 491                                          33 * sizeof(vector128), -1);
 492                 if (!ret)
 493                         target->thread.vrsave = vrsave.word;
 494         }
 495
 496         return ret;
 497 }
 498 #endif /* CONFIG_ALTIVEC */
 499
 500 #ifdef CONFIG_VSX
 501 /*
 502  * Currently to set and and get all the vsx state, you need to call
 503  * the fp and VMX calls as well.  This only get/sets the lower 32
 504  * 128bit VSX registers.
 505  */
 506
 507 static int vsr_active(struct task_struct *target,
 508                       const struct user_regset *regset)
 509 {
 510         flush_vsx_to_thread(target);
 511         return target->thread.used_vsr ? regset->n : 0;
 512 }
 513
 514 static int vsr_get(struct task_struct *target, const struct user_regset *regset,
 515                    unsigned int pos, unsigned int count,
 516                    void *kbuf, void __user *ubuf)
 517 {
 518         u64 buf[32];
 519         int ret, i;
 520
 521         flush_vsx_to_thread(target);
 522
 523         for (i = 0; i < 32 ; i++)
 524                 buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
 525         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 526                                   buf, 0, 32 * sizeof(double));
 527
 528         return ret;
 529 }
 530
 531 static int vsr_set(struct task_struct *target, const struct user_regset *regset,
 532                    unsigned int pos, unsigned int count,
 533                    const void *kbuf, const void __user *ubuf)
 534 {
 535         u64 buf[32];
 536         int ret,i;
 537
 538         flush_vsx_to_thread(target);
 539
 540         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 541                                  buf, 0, 32 * sizeof(double));
 542         for (i = 0; i < 32 ; i++)
 543                 target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
 544
 545
 546         return ret;
 547 }
 548 #endif /* CONFIG_VSX */
 549
 550 #ifdef CONFIG_SPE
 551
 552 /*
 553  * For get_evrregs/set_evrregs functions 'data' has the following layout:
 554  *
 555  * struct {
 556  *   u32 evr[32];
 557  *   u64 acc;
 558  *   u32 spefscr;
 559  * }
 560  */
 561
 562 static int evr_active(struct task_struct *target,
 563                       const struct user_regset *regset)
 564 {
 565         flush_spe_to_thread(target);
 566         return target->thread.used_spe ? regset->n : 0;
 567 }
 568
 569 static int evr_get(struct task_struct *target, const struct user_regset *regset,
 570                    unsigned int pos, unsigned int count,
 571                    void *kbuf, void __user *ubuf)
 572 {
 573         int ret;
 574
 575         flush_spe_to_thread(target);
 576
 577         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 578                                   &target->thread.evr,
 579                                   0, sizeof(target->thread.evr));
 580
 581         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 582                      offsetof(struct thread_struct, spefscr));
 583
 584         if (!ret)
 585                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 586                                           &target->thread.acc,
 587                                           sizeof(target->thread.evr), -1);
 588
 589         return ret;
 590 }
 591
 592 static int evr_set(struct task_struct *target, const struct user_regset *regset,
 593                    unsigned int pos, unsigned int count,
 594                    const void *kbuf, const void __user *ubuf)
 595 {
 596         int ret;
 597
 598         flush_spe_to_thread(target);
 599
 600         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 601                                  &target->thread.evr,
 602                                  0, sizeof(target->thread.evr));
 603
 604         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
 605                      offsetof(struct thread_struct, spefscr));
 606
 607         if (!ret)
 608                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 609                                          &target->thread.acc,
 610                                          sizeof(target->thread.evr), -1);
 611
 612         return ret;
 613 }
 614 #endif /* CONFIG_SPE */
 615
 616
 617 /*
 618  * These are our native regset flavors.
 619  */
 620 enum powerpc_regset {
 621         REGSET_GPR,
 622         REGSET_FPR,
 623 #ifdef CONFIG_ALTIVEC
 624         REGSET_VMX,
 625 #endif
 626 #ifdef CONFIG_VSX
 627         REGSET_VSX,
 628 #endif
 629 #ifdef CONFIG_SPE
 630         REGSET_SPE,
 631 #endif
 632 };
 633
 634 static const struct user_regset native_regsets[] = {
 635         [REGSET_GPR] = {
 636                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 637                 .size = sizeof(long), .align = sizeof(long),
 638                 .get = gpr_get, .set = gpr_set
 639         },
 640         [REGSET_FPR] = {
 641                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 642                 .size = sizeof(double), .align = sizeof(double),
 643                 .get = fpr_get, .set = fpr_set
 644         },
 645 #ifdef CONFIG_ALTIVEC
 646         [REGSET_VMX] = {
 647                 .core_note_type = NT_PPC_VMX, .n = 34,
 648                 .size = sizeof(vector128), .align = sizeof(vector128),
 649                 .active = vr_active, .get = vr_get, .set = vr_set
 650         },
 651 #endif
 652 #ifdef CONFIG_VSX
 653         [REGSET_VSX] = {
 654                 .core_note_type = NT_PPC_VSX, .n = 32,
 655                 .size = sizeof(double), .align = sizeof(double),
 656                 .active = vsr_active, .get = vsr_get, .set = vsr_set
 657         },
 658 #endif
 659 #ifdef CONFIG_SPE
 660         [REGSET_SPE] = {
 661                 .core_note_type = NT_PPC_SPE, .n = 35,
 662                 .size = sizeof(u32), .align = sizeof(u32),
 663                 .active = evr_active, .get = evr_get, .set = evr_set
 664         },
 665 #endif
 666 };
 667
 668 static const struct user_regset_view user_ppc_native_view = {
 669         .name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
 670         .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
 671 };
 672
 673 #ifdef CONFIG_PPC64
 674 #include <linux/compat.h>
 675
 676 static int gpr32_get(struct task_struct *target,
 677                      const struct user_regset *regset,
 678                      unsigned int pos, unsigned int count,
 679                      void *kbuf, void __user *ubuf)
 680 {
 681         const unsigned long *regs = &target->thread.regs->gpr[0];
 682         compat_ulong_t *k = kbuf;
 683         compat_ulong_t __user *u = ubuf;
 684         compat_ulong_t reg;
 685         int i;
 686
 687         if (target->thread.regs == NULL)
 688                 return -EIO;
 689
 690         if (!FULL_REGS(target->thread.regs)) {
 691                 /* We have a partial register set.  Fill 14-31 with bogus values */
 692                 for (i = 14; i < 32; i++)
 693                         target->thread.regs->gpr[i] = NV_REG_POISON;
 694         }
 695
 696         pos /= sizeof(reg);
 697         count /= sizeof(reg);
 698
 699         if (kbuf)
 700                 for (; count > 0 && pos < PT_MSR; --count)
 701                         *k++ = regs[pos++];
 702         else
 703                 for (; count > 0 && pos < PT_MSR; --count)
 704                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 705                                 return -EFAULT;
 706
 707         if (count > 0 && pos == PT_MSR) {
 708                 reg = get_user_msr(target);
 709                 if (kbuf)
 710                         *k++ = reg;
 711                 else if (__put_user(reg, u++))
 712                         return -EFAULT;
 713                 ++pos;
 714                 --count;
 715         }
 716
 717         if (kbuf)
 718                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 719                         *k++ = regs[pos++];
 720         else
 721                 for (; count > 0 && pos < PT_REGS_COUNT; --count)
 722                         if (__put_user((compat_ulong_t) regs[pos++], u++))
 723                                 return -EFAULT;
 724
 725         kbuf = k;
 726         ubuf = u;
 727         pos *= sizeof(reg);
 728         count *= sizeof(reg);
 729         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 730                                         PT_REGS_COUNT * sizeof(reg), -1);
 731 }
 732
 733 static int gpr32_set(struct task_struct *target,
 734                      const struct user_regset *regset,
 735                      unsigned int pos, unsigned int count,
 736                      const void *kbuf, const void __user *ubuf)
 737 {
 738         unsigned long *regs = &target->thread.regs->gpr[0];
 739         const compat_ulong_t *k = kbuf;
 740         const compat_ulong_t __user *u = ubuf;
 741         compat_ulong_t reg;
 742
 743         if (target->thread.regs == NULL)
 744                 return -EIO;
 745
 746         CHECK_FULL_REGS(target->thread.regs);
 747
 748         pos /= sizeof(reg);
 749         count /= sizeof(reg);
 750
 751         if (kbuf)
 752                 for (; count > 0 && pos < PT_MSR; --count)
 753                         regs[pos++] = *k++;
 754         else
 755                 for (; count > 0 && pos < PT_MSR; --count) {
 756                         if (__get_user(reg, u++))
 757                                 return -EFAULT;
 758                         regs[pos++] = reg;
 759                 }
 760
 761
 762         if (count > 0 && pos == PT_MSR) {
 763                 if (kbuf)
 764                         reg = *k++;
 765                 else if (__get_user(reg, u++))
 766                         return -EFAULT;
 767                 set_user_msr(target, reg);
 768                 ++pos;
 769                 --count;
 770         }
 771
 772         if (kbuf) {
 773                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
 774                         regs[pos++] = *k++;
 775                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 776                         ++k;
 777         } else {
 778                 for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
 779                         if (__get_user(reg, u++))
 780                                 return -EFAULT;
 781                         regs[pos++] = reg;
 782                 }
 783                 for (; count > 0 && pos < PT_TRAP; --count, ++pos)
 784                         if (__get_user(reg, u++))
 785                                 return -EFAULT;
 786         }
 787
 788         if (count > 0 && pos == PT_TRAP) {
 789                 if (kbuf)
 790                         reg = *k++;
 791                 else if (__get_user(reg, u++))
 792                         return -EFAULT;
 793                 set_user_trap(target, reg);
 794                 ++pos;
 795                 --count;
 796         }
 797
 798         kbuf = k;
 799         ubuf = u;
 800         pos *= sizeof(reg);
 801         count *= sizeof(reg);
 802         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 803                                          (PT_TRAP + 1) * sizeof(reg), -1);
 804 }
 805
 806 /*
 807  * These are the regset flavors matching the CONFIG_PPC32 native set.
 808  */
 809 static const struct user_regset compat_regsets[] = {
 810         [REGSET_GPR] = {
 811                 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
 812                 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
 813                 .get = gpr32_get, .set = gpr32_set
 814         },
 815         [REGSET_FPR] = {
 816                 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
 817                 .size = sizeof(double), .align = sizeof(double),
 818                 .get = fpr_get, .set = fpr_set
 819         },
 820 #ifdef CONFIG_ALTIVEC
 821         [REGSET_VMX] = {
 822                 .core_note_type = NT_PPC_VMX, .n = 34,
 823                 .size = sizeof(vector128), .align = sizeof(vector128),
 824                 .active = vr_active, .get = vr_get, .set = vr_set
 825         },
 826 #endif
 827 #ifdef CONFIG_SPE
 828         [REGSET_SPE] = {
 829                 .core_note_type = NT_PPC_SPE, .n = 35,
 830                 .size = sizeof(u32), .align = sizeof(u32),
 831                 .active = evr_active, .get = evr_get, .set = evr_set
 832         },
 833 #endif
 834 };
 835
 836 static const struct user_regset_view user_ppc_compat_view = {
 837         .name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
 838         .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
 839 };
 840 #endif  /* CONFIG_PPC64 */
 841
 842 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 843 {
 844 #ifdef CONFIG_PPC64
 845         if (test_tsk_thread_flag(task, TIF_32BIT))
 846                 return &user_ppc_compat_view;
 847 #endif
 848         return &user_ppc_native_view;
 849 }
 850
 851
 852 void user_enable_single_step(struct task_struct *task)
 853 {
 854         struct pt_regs *regs = task->thread.regs;
 855
 856         if (regs != NULL) {
 857 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 858                 task->thread.debug.dbcr0 &= ~DBCR0_BT;
 859                 task->thread.debug.dbcr0 |= DBCR0_IDM | DBCR0_IC;
 860                 regs->msr |= MSR_DE;
 861 #else
 862                 regs->msr &= ~MSR_BE;
 863                 regs->msr |= MSR_SE;
 864 #endif
 865         }
 866         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 867 }
 868
 869 void user_enable_block_step(struct task_struct *task)
 870 {
 871         struct pt_regs *regs = task->thread.regs;
 872
 873         if (regs != NULL) {
 874 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 875                 task->thread.debug.dbcr0 &= ~DBCR0_IC;
 876                 task->thread.debug.dbcr0 = DBCR0_IDM | DBCR0_BT;
 877                 regs->msr |= MSR_DE;
 878 #else
 879                 regs->msr &= ~MSR_SE;
 880                 regs->msr |= MSR_BE;
 881 #endif
 882         }
 883         set_tsk_thread_flag(task, TIF_SINGLESTEP);
 884 }
 885
 886 void user_disable_single_step(struct task_struct *task)
 887 {
 888         struct pt_regs *regs = task->thread.regs;
 889
 890         if (regs != NULL) {
 891 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 892                 /*
 893                  * The logic to disable single stepping should be as
 894                  * simple as turning off the Instruction Complete flag.
 895                  * And, after doing so, if all debug flags are off, turn
 896                  * off DBCR0(IDM) and MSR(DE) .... Torez
 897                  */
 898                 task->thread.debug.dbcr0 &= ~(DBCR0_IC|DBCR0_BT);
 899                 /*
 900                  * Test to see if any of the DBCR_ACTIVE_EVENTS bits are set.
 901                  */
 902                 if (!DBCR_ACTIVE_EVENTS(task->thread.debug.dbcr0,
 903                                         task->thread.debug.dbcr1)) {
 904                         /*
 905                          * All debug events were off.....
 906                          */
 907                         task->thread.debug.dbcr0 &= ~DBCR0_IDM;
 908                         regs->msr &= ~MSR_DE;
 909                 }
 910 #else
 911                 regs->msr &= ~(MSR_SE | MSR_BE);
 912 #endif
 913         }
 914         clear_tsk_thread_flag(task, TIF_SINGLESTEP);
 915 }
 916
 917 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 918 void ptrace_triggered(struct perf_event *bp,
 919                       struct perf_sample_data *data, struct pt_regs *regs)
 920 {
 921         struct perf_event_attr attr;
 922
 923         /*
 924          * Disable the breakpoint request here since ptrace has defined a
 925          * one-shot behaviour for breakpoint exceptions in PPC64.
 926          * The SIGTRAP signal is generated automatically for us in do_dabr().
 927          * We don't have to do anything about that here
 928          */
 929         attr = bp->attr;
 930         attr.disabled = true;
 931         modify_user_hw_breakpoint(bp, &attr);
 932 }
 933 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 934
 935 static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
 936                                unsigned long data)
 937 {
 938 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 939         int ret;
 940         struct thread_struct *thread = &(task->thread);
 941         struct perf_event *bp;
 942         struct perf_event_attr attr;
 943 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 944 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
 945         struct arch_hw_breakpoint hw_brk;
 946 #endif
 947
 948         /* For ppc64 we support one DABR and no IABR's at the moment (ppc64).
 949          *  For embedded processors we support one DAC and no IAC's at the
 950          *  moment.
 951          */
 952         if (addr > 0)
 953                 return -EINVAL;
 954
 955         /* The bottom 3 bits in dabr are flags */
 956         if ((data & ~0x7UL) >= TASK_SIZE)
 957                 return -EIO;
 958
 959 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
 960         /* For processors using DABR (i.e. 970), the bottom 3 bits are flags.
 961          *  It was assumed, on previous implementations, that 3 bits were
 962          *  passed together with the data address, fitting the design of the
 963          *  DABR register, as follows:
 964          *
 965          *  bit 0: Read flag
 966          *  bit 1: Write flag
 967          *  bit 2: Breakpoint translation
 968          *
 969          *  Thus, we use them here as so.
 970          */
 971
 972         /* Ensure breakpoint translation bit is set */
 973         if (data && !(data & HW_BRK_TYPE_TRANSLATE))
 974                 return -EIO;
 975         hw_brk.address = data & (~HW_BRK_TYPE_DABR);
 976         hw_brk.type = (data & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
 977         hw_brk.len = 8;
 978 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 979         bp = thread->ptrace_bps[0];
 980         if ((!data) || !(hw_brk.type & HW_BRK_TYPE_RDWR)) {
 981                 if (bp) {
 982                         unregister_hw_breakpoint(bp);
 983                         thread->ptrace_bps[0] = NULL;
 984                 }
 985                 return 0;
 986         }
 987         if (bp) {
 988                 attr = bp->attr;
 989                 attr.bp_addr = hw_brk.address;
 990                 arch_bp_generic_fields(hw_brk.type, &attr.bp_type);
 991
 992                 /* Enable breakpoint */
 993                 attr.disabled = false;
 994
 995                 ret =  modify_user_hw_breakpoint(bp, &attr);
 996                 if (ret) {
 997                         return ret;
 998                 }
 999                 thread->ptrace_bps[0] = bp;
1000                 thread->hw_brk = hw_brk;
1001                 return 0;
1002         }
1003
1004         /* Create a new breakpoint request if one doesn't exist already */
1005         hw_breakpoint_init(&attr);
1006         attr.bp_addr = hw_brk.address;
1007         arch_bp_generic_fields(hw_brk.type,
1008                                &attr.bp_type);
1009
1010         thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
1011                                                ptrace_triggered, NULL, task);
1012         if (IS_ERR(bp)) {
1013                 thread->ptrace_bps[0] = NULL;
1014                 return PTR_ERR(bp);
1015         }
1016
1017 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1018         task->thread.hw_brk = hw_brk;
1019 #else /* CONFIG_PPC_ADV_DEBUG_REGS */
1020         /* As described above, it was assumed 3 bits were passed with the data
1021          *  address, but we will assume only the mode bits will be passed
1022          *  as to not cause alignment restrictions for DAC-based processors.
1023          */
1024
1025         /* DAC's hold the whole address without any mode flags */
1026         task->thread.debug.dac1 = data & ~0x3UL;
1027
1028         if (task->thread.debug.dac1 == 0) {
1029                 dbcr_dac(task) &= ~(DBCR_DAC1R | DBCR_DAC1W);
1030                 if (!DBCR_ACTIVE_EVENTS(task->thread.debug.dbcr0,
1031                                         task->thread.debug.dbcr1)) {
1032                         task->thread.regs->msr &= ~MSR_DE;
1033                         task->thread.debug.dbcr0 &= ~DBCR0_IDM;
1034                 }
1035                 return 0;
1036         }
1037
1038         /* Read or Write bits must be set */
1039
1040         if (!(data & 0x3UL))
1041                 return -EINVAL;
1042
1043         /* Set the Internal Debugging flag (IDM bit 1) for the DBCR0
1044            register */
1045         task->thread.debug.dbcr0 |= DBCR0_IDM;
1046
1047         /* Check for write and read flags and set DBCR0
1048            accordingly */
1049         dbcr_dac(task) &= ~(DBCR_DAC1R|DBCR_DAC1W);
1050         if (data & 0x1UL)
1051                 dbcr_dac(task) |= DBCR_DAC1R;
1052         if (data & 0x2UL)
1053                 dbcr_dac(task) |= DBCR_DAC1W;
1054         task->thread.regs->msr |= MSR_DE;
1055 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1056         return 0;
1057 }
1058
1059 /*
1060  * Called by kernel/ptrace.c when detaching..
1061  *
1062  * Make sure single step bits etc are not set.
1063  */
1064 void ptrace_disable(struct task_struct *child)
1065 {
1066         /* make sure the single step bit is not set. */
1067         user_disable_single_step(child);
1068 }
1069
1070 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1071 static long set_instruction_bp(struct task_struct *child,
1072                               struct ppc_hw_breakpoint *bp_info)
1073 {
1074         int slot;
1075         int slot1_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC1) != 0);
1076         int slot2_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC2) != 0);
1077         int slot3_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC3) != 0);
1078         int slot4_in_use = ((child->thread.debug.dbcr0 & DBCR0_IAC4) != 0);
1079
1080         if (dbcr_iac_range(child) & DBCR_IAC12MODE)
1081                 slot2_in_use = 1;
1082         if (dbcr_iac_range(child) & DBCR_IAC34MODE)
1083                 slot4_in_use = 1;
1084
1085         if (bp_info->addr >= TASK_SIZE)
1086                 return -EIO;
1087
1088         if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT) {
1089
1090                 /* Make sure range is valid. */
1091                 if (bp_info->addr2 >= TASK_SIZE)
1092                         return -EIO;
1093
1094                 /* We need a pair of IAC regsisters */
1095                 if ((!slot1_in_use) && (!slot2_in_use)) {
1096                         slot = 1;
1097                         child->thread.debug.iac1 = bp_info->addr;
1098                         child->thread.debug.iac2 = bp_info->addr2;
1099                         child->thread.debug.dbcr0 |= DBCR0_IAC1;
1100                         if (bp_info->addr_mode ==
1101                                         PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1102                                 dbcr_iac_range(child) |= DBCR_IAC12X;
1103                         else
1104                                 dbcr_iac_range(child) |= DBCR_IAC12I;
1105 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1106                 } else if ((!slot3_in_use) && (!slot4_in_use)) {
1107                         slot = 3;
1108                         child->thread.debug.iac3 = bp_info->addr;
1109                         child->thread.debug.iac4 = bp_info->addr2;
1110                         child->thread.debug.dbcr0 |= DBCR0_IAC3;
1111                         if (bp_info->addr_mode ==
1112                                         PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1113                                 dbcr_iac_range(child) |= DBCR_IAC34X;
1114                         else
1115                                 dbcr_iac_range(child) |= DBCR_IAC34I;
1116 #endif
1117                 } else
1118                         return -ENOSPC;
1119         } else {
1120                 /* We only need one.  If possible leave a pair free in
1121                  * case a range is needed later
1122                  */
1123                 if (!slot1_in_use) {
1124                         /*
1125                          * Don't use iac1 if iac1-iac2 are free and either
1126                          * iac3 or iac4 (but not both) are free
1127                          */
1128                         if (slot2_in_use || (slot3_in_use == slot4_in_use)) {
1129                                 slot = 1;
1130                                 child->thread.debug.iac1 = bp_info->addr;
1131                                 child->thread.debug.dbcr0 |= DBCR0_IAC1;
1132                                 goto out;
1133                         }
1134                 }
1135                 if (!slot2_in_use) {
1136                         slot = 2;
1137                         child->thread.debug.iac2 = bp_info->addr;
1138                         child->thread.debug.dbcr0 |= DBCR0_IAC2;
1139 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1140                 } else if (!slot3_in_use) {
1141                         slot = 3;
1142                         child->thread.debug.iac3 = bp_info->addr;
1143                         child->thread.debug.dbcr0 |= DBCR0_IAC3;
1144                 } else if (!slot4_in_use) {
1145                         slot = 4;
1146                         child->thread.debug.iac4 = bp_info->addr;
1147                         child->thread.debug.dbcr0 |= DBCR0_IAC4;
1148 #endif
1149                 } else
1150                         return -ENOSPC;
1151         }
1152 out:
1153         child->thread.debug.dbcr0 |= DBCR0_IDM;
1154         child->thread.regs->msr |= MSR_DE;
1155
1156         return slot;
1157 }
1158
1159 static int del_instruction_bp(struct task_struct *child, int slot)
1160 {
1161         switch (slot) {
1162         case 1:
1163                 if ((child->thread.debug.dbcr0 & DBCR0_IAC1) == 0)
1164                         return -ENOENT;
1165
1166                 if (dbcr_iac_range(child) & DBCR_IAC12MODE) {
1167                         /* address range - clear slots 1 & 2 */
1168                         child->thread.debug.iac2 = 0;
1169                         dbcr_iac_range(child) &= ~DBCR_IAC12MODE;
1170                 }
1171                 child->thread.debug.iac1 = 0;
1172                 child->thread.debug.dbcr0 &= ~DBCR0_IAC1;
1173                 break;
1174         case 2:
1175                 if ((child->thread.debug.dbcr0 & DBCR0_IAC2) == 0)
1176                         return -ENOENT;
1177
1178                 if (dbcr_iac_range(child) & DBCR_IAC12MODE)
1179                         /* used in a range */
1180                         return -EINVAL;
1181                 child->thread.debug.iac2 = 0;
1182                 child->thread.debug.dbcr0 &= ~DBCR0_IAC2;
1183                 break;
1184 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
1185         case 3:
1186                 if ((child->thread.debug.dbcr0 & DBCR0_IAC3) == 0)
1187                         return -ENOENT;
1188
1189                 if (dbcr_iac_range(child) & DBCR_IAC34MODE) {
1190                         /* address range - clear slots 3 & 4 */
1191                         child->thread.debug.iac4 = 0;
1192                         dbcr_iac_range(child) &= ~DBCR_IAC34MODE;
1193                 }
1194                 child->thread.debug.iac3 = 0;
1195                 child->thread.debug.dbcr0 &= ~DBCR0_IAC3;
1196                 break;
1197         case 4:
1198                 if ((child->thread.debug.dbcr0 & DBCR0_IAC4) == 0)
1199                         return -ENOENT;
1200
1201                 if (dbcr_iac_range(child) & DBCR_IAC34MODE)
1202                         /* Used in a range */
1203                         return -EINVAL;
1204                 child->thread.debug.iac4 = 0;
1205                 child->thread.debug.dbcr0 &= ~DBCR0_IAC4;
1206                 break;
1207 #endif
1208         default:
1209                 return -EINVAL;
1210         }
1211         return 0;
1212 }
1213
1214 static int set_dac(struct task_struct *child, struct ppc_hw_breakpoint *bp_info)
1215 {
1216         int byte_enable =
1217                 (bp_info->condition_mode >> PPC_BREAKPOINT_CONDITION_BE_SHIFT)
1218                 & 0xf;
1219         int condition_mode =
1220                 bp_info->condition_mode & PPC_BREAKPOINT_CONDITION_MODE;
1221         int slot;
1222
1223         if (byte_enable && (condition_mode == 0))
1224                 return -EINVAL;
1225
1226         if (bp_info->addr >= TASK_SIZE)
1227                 return -EIO;
1228
1229         if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0) {
1230                 slot = 1;
1231                 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1232                         dbcr_dac(child) |= DBCR_DAC1R;
1233                 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1234                         dbcr_dac(child) |= DBCR_DAC1W;
1235                 child->thread.debug.dac1 = (unsigned long)bp_info->addr;
1236 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1237                 if (byte_enable) {
1238                         child->thread.debug.dvc1 =
1239                                 (unsigned long)bp_info->condition_value;
1240                         child->thread.debug.dbcr2 |=
1241                                 ((byte_enable << DBCR2_DVC1BE_SHIFT) |
1242                                  (condition_mode << DBCR2_DVC1M_SHIFT));
1243                 }
1244 #endif
1245 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1246         } else if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) {
1247                 /* Both dac1 and dac2 are part of a range */
1248                 return -ENOSPC;
1249 #endif
1250         } else if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0) {
1251                 slot = 2;
1252                 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1253                         dbcr_dac(child) |= DBCR_DAC2R;
1254                 if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1255                         dbcr_dac(child) |= DBCR_DAC2W;
1256                 child->thread.debug.dac2 = (unsigned long)bp_info->addr;
1257 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1258                 if (byte_enable) {
1259                         child->thread.debug.dvc2 =
1260                                 (unsigned long)bp_info->condition_value;
1261                         child->thread.debug.dbcr2 |=
1262                                 ((byte_enable << DBCR2_DVC2BE_SHIFT) |
1263                                  (condition_mode << DBCR2_DVC2M_SHIFT));
1264                 }
1265 #endif
1266         } else
1267                 return -ENOSPC;
1268         child->thread.debug.dbcr0 |= DBCR0_IDM;
1269         child->thread.regs->msr |= MSR_DE;
1270
1271         return slot + 4;
1272 }
1273
1274 static int del_dac(struct task_struct *child, int slot)
1275 {
1276         if (slot == 1) {
1277                 if ((dbcr_dac(child) & (DBCR_DAC1R | DBCR_DAC1W)) == 0)
1278                         return -ENOENT;
1279
1280                 child->thread.debug.dac1 = 0;
1281                 dbcr_dac(child) &= ~(DBCR_DAC1R | DBCR_DAC1W);
1282 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1283                 if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE) {
1284                         child->thread.debug.dac2 = 0;
1285                         child->thread.debug.dbcr2 &= ~DBCR2_DAC12MODE;
1286                 }
1287                 child->thread.debug.dbcr2 &= ~(DBCR2_DVC1M | DBCR2_DVC1BE);
1288 #endif
1289 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1290                 child->thread.debug.dvc1 = 0;
1291 #endif
1292         } else if (slot == 2) {
1293                 if ((dbcr_dac(child) & (DBCR_DAC2R | DBCR_DAC2W)) == 0)
1294                         return -ENOENT;
1295
1296 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1297                 if (child->thread.debug.dbcr2 & DBCR2_DAC12MODE)
1298                         /* Part of a range */
1299                         return -EINVAL;
1300                 child->thread.debug.dbcr2 &= ~(DBCR2_DVC2M | DBCR2_DVC2BE);
1301 #endif
1302 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
1303                 child->thread.debug.dvc2 = 0;
1304 #endif
1305                 child->thread.debug.dac2 = 0;
1306                 dbcr_dac(child) &= ~(DBCR_DAC2R | DBCR_DAC2W);
1307         } else
1308                 return -EINVAL;
1309
1310         return 0;
1311 }
1312 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1313
1314 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1315 static int set_dac_range(struct task_struct *child,
1316                          struct ppc_hw_breakpoint *bp_info)
1317 {
1318         int mode = bp_info->addr_mode & PPC_BREAKPOINT_MODE_MASK;
1319
1320         /* We don't allow range watchpoints to be used with DVC */
1321         if (bp_info->condition_mode)
1322                 return -EINVAL;
1323
1324         /*
1325          * Best effort to verify the address range.  The user/supervisor bits
1326          * prevent trapping in kernel space, but let's fail on an obvious bad
1327          * range.  The simple test on the mask is not fool-proof, and any
1328          * exclusive range will spill over into kernel space.
1329          */
1330         if (bp_info->addr >= TASK_SIZE)
1331                 return -EIO;
1332         if (mode == PPC_BREAKPOINT_MODE_MASK) {
1333                 /*
1334                  * dac2 is a bitmask.  Don't allow a mask that makes a
1335                  * kernel space address from a valid dac1 value
1336                  */
1337                 if (~((unsigned long)bp_info->addr2) >= TASK_SIZE)
1338                         return -EIO;
1339         } else {
1340                 /*
1341                  * For range breakpoints, addr2 must also be a valid address
1342                  */
1343                 if (bp_info->addr2 >= TASK_SIZE)
1344                         return -EIO;
1345         }
1346
1347         if (child->thread.debug.dbcr0 &
1348             (DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W))
1349                 return -ENOSPC;
1350
1351         if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1352                 child->thread.debug.dbcr0 |= (DBCR0_DAC1R | DBCR0_IDM);
1353         if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1354                 child->thread.debug.dbcr0 |= (DBCR0_DAC1W | DBCR0_IDM);
1355         child->thread.debug.dac1 = bp_info->addr;
1356         child->thread.debug.dac2 = bp_info->addr2;
1357         if (mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE)
1358                 child->thread.debug.dbcr2  |= DBCR2_DAC12M;
1359         else if (mode == PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE)
1360                 child->thread.debug.dbcr2  |= DBCR2_DAC12MX;
1361         else    /* PPC_BREAKPOINT_MODE_MASK */
1362                 child->thread.debug.dbcr2  |= DBCR2_DAC12MM;
1363         child->thread.regs->msr |= MSR_DE;
1364
1365         return 5;
1366 }
1367 #endif /* CONFIG_PPC_ADV_DEBUG_DAC_RANGE */
1368
1369 static long ppc_set_hwdebug(struct task_struct *child,
1370                      struct ppc_hw_breakpoint *bp_info)
1371 {
1372 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1373         int len = 0;
1374         struct thread_struct *thread = &(child->thread);
1375         struct perf_event *bp;
1376         struct perf_event_attr attr;
1377 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1378 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
1379         struct arch_hw_breakpoint brk;
1380 #endif
1381
1382         if (bp_info->version != 1)
1383                 return -ENOTSUPP;
1384 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1385         /*
1386          * Check for invalid flags and combinations
1387          */
1388         if ((bp_info->trigger_type == 0) ||
1389             (bp_info->trigger_type & ~(PPC_BREAKPOINT_TRIGGER_EXECUTE |
1390                                        PPC_BREAKPOINT_TRIGGER_RW)) ||
1391             (bp_info->addr_mode & ~PPC_BREAKPOINT_MODE_MASK) ||
1392             (bp_info->condition_mode &
1393              ~(PPC_BREAKPOINT_CONDITION_MODE |
1394                PPC_BREAKPOINT_CONDITION_BE_ALL)))
1395                 return -EINVAL;
1396 #if CONFIG_PPC_ADV_DEBUG_DVCS == 0
1397         if (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
1398                 return -EINVAL;
1399 #endif
1400
1401         if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_EXECUTE) {
1402                 if ((bp_info->trigger_type != PPC_BREAKPOINT_TRIGGER_EXECUTE) ||
1403                     (bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE))
1404                         return -EINVAL;
1405                 return set_instruction_bp(child, bp_info);
1406         }
1407         if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_EXACT)
1408                 return set_dac(child, bp_info);
1409
1410 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1411         return set_dac_range(child, bp_info);
1412 #else
1413         return -EINVAL;
1414 #endif
1415 #else /* !CONFIG_PPC_ADV_DEBUG_DVCS */
1416         /*
1417          * We only support one data breakpoint
1418          */
1419         if ((bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_RW) == 0 ||
1420             (bp_info->trigger_type & ~PPC_BREAKPOINT_TRIGGER_RW) != 0 ||
1421             bp_info->condition_mode != PPC_BREAKPOINT_CONDITION_NONE)
1422                 return -EINVAL;
1423
1424         if ((unsigned long)bp_info->addr >= TASK_SIZE)
1425                 return -EIO;
1426
1427         brk.address = bp_info->addr & ~7UL;
1428         brk.type = HW_BRK_TYPE_TRANSLATE;
1429         brk.len = 8;
1430         if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_READ)
1431                 brk.type |= HW_BRK_TYPE_READ;
1432         if (bp_info->trigger_type & PPC_BREAKPOINT_TRIGGER_WRITE)
1433                 brk.type |= HW_BRK_TYPE_WRITE;
1434 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1435         /*
1436          * Check if the request is for 'range' breakpoints. We can
1437          * support it if range < 8 bytes.
1438          */
1439         if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE)
1440                 len = bp_info->addr2 - bp_info->addr;
1441         else if (bp_info->addr_mode == PPC_BREAKPOINT_MODE_EXACT)
1442                 len = 1;
1443         else
1444                 return -EINVAL;
1445         bp = thread->ptrace_bps[0];
1446         if (bp)
1447                 return -ENOSPC;
1448
1449         /* Create a new breakpoint request if one doesn't exist already */
1450         hw_breakpoint_init(&attr);
1451         attr.bp_addr = (unsigned long)bp_info->addr & ~HW_BREAKPOINT_ALIGN;
1452         attr.bp_len = len;
1453         arch_bp_generic_fields(brk.type, &attr.bp_type);
1454
1455         thread->ptrace_bps[0] = bp = register_user_hw_breakpoint(&attr,
1456                                                ptrace_triggered, NULL, child);
1457         if (IS_ERR(bp)) {
1458                 thread->ptrace_bps[0] = NULL;
1459                 return PTR_ERR(bp);
1460         }
1461
1462         return 1;
1463 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1464
1465         if (bp_info->addr_mode != PPC_BREAKPOINT_MODE_EXACT)
1466                 return -EINVAL;
1467
1468         if (child->thread.hw_brk.address)
1469                 return -ENOSPC;
1470
1471         child->thread.hw_brk = brk;
1472
1473         return 1;
1474 #endif /* !CONFIG_PPC_ADV_DEBUG_DVCS */
1475 }
1476
1477 static long ppc_del_hwdebug(struct task_struct *child, long data)
1478 {
1479 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1480         int ret = 0;
1481         struct thread_struct *thread = &(child->thread);
1482         struct perf_event *bp;
1483 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1484 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1485         int rc;
1486
1487         if (data <= 4)
1488                 rc = del_instruction_bp(child, (int)data);
1489         else
1490                 rc = del_dac(child, (int)data - 4);
1491
1492         if (!rc) {
1493                 if (!DBCR_ACTIVE_EVENTS(child->thread.debug.dbcr0,
1494                                         child->thread.debug.dbcr1)) {
1495                         child->thread.debug.dbcr0 &= ~DBCR0_IDM;
1496                         child->thread.regs->msr &= ~MSR_DE;
1497                 }
1498         }
1499         return rc;
1500 #else
1501         if (data != 1)
1502                 return -EINVAL;
1503
1504 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1505         bp = thread->ptrace_bps[0];
1506         if (bp) {
1507                 unregister_hw_breakpoint(bp);
1508                 thread->ptrace_bps[0] = NULL;
1509         } else
1510                 ret = -ENOENT;
1511         return ret;
1512 #else /* CONFIG_HAVE_HW_BREAKPOINT */
1513         if (child->thread.hw_brk.address == 0)
1514                 return -ENOENT;
1515
1516         child->thread.hw_brk.address = 0;
1517         child->thread.hw_brk.type = 0;
1518 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1519
1520         return 0;
1521 #endif
1522 }
1523
1524 long arch_ptrace(struct task_struct *child, long request,
1525                  unsigned long addr, unsigned long data)
1526 {
1527         int ret = -EPERM;
1528         void __user *datavp = (void __user *) data;
1529         unsigned long __user *datalp = datavp;
1530
1531         switch (request) {
1532         /* read the word at location addr in the USER area. */
1533         case PTRACE_PEEKUSR: {
1534                 unsigned long index, tmp;
1535
1536                 ret = -EIO;
1537                 /* convert to index and check */
1538 #ifdef CONFIG_PPC32
1539                 index = addr >> 2;
1540                 if ((addr & 3) || (index > PT_FPSCR)
1541                     || (child->thread.regs == NULL))
1542 #else
1543                 index = addr >> 3;
1544                 if ((addr & 7) || (index > PT_FPSCR))
1545 #endif
1546                         break;
1547
1548                 CHECK_FULL_REGS(child->thread.regs);
1549                 if (index < PT_FPR0) {
1550                         ret = ptrace_get_reg(child, (int) index, &tmp);
1551                         if (ret)
1552                                 break;
1553                 } else {
1554                         unsigned int fpidx = index - PT_FPR0;
1555
1556                         flush_fp_to_thread(child);
1557                         if (fpidx < (PT_FPSCR - PT_FPR0))
1558                                 memcpy(&tmp, &child->thread.TS_FPR(fpidx),
1559                                        sizeof(long));
1560                         else
1561                                 tmp = child->thread.fp_state.fpscr;
1562                 }
1563                 ret = put_user(tmp, datalp);
1564                 break;
1565         }
1566
1567         /* write the word at location addr in the USER area */
1568         case PTRACE_POKEUSR: {
1569                 unsigned long index;
1570
1571                 ret = -EIO;
1572                 /* convert to index and check */
1573 #ifdef CONFIG_PPC32
1574                 index = addr >> 2;
1575                 if ((addr & 3) || (index > PT_FPSCR)
1576                     || (child->thread.regs == NULL))
1577 #else
1578                 index = addr >> 3;
1579                 if ((addr & 7) || (index > PT_FPSCR))
1580 #endif
1581                         break;
1582
1583                 CHECK_FULL_REGS(child->thread.regs);
1584                 if (index < PT_FPR0) {
1585                         ret = ptrace_put_reg(child, index, data);
1586                 } else {
1587                         unsigned int fpidx = index - PT_FPR0;
1588
1589                         flush_fp_to_thread(child);
1590                         if (fpidx < (PT_FPSCR - PT_FPR0))
1591                                 memcpy(&child->thread.TS_FPR(fpidx), &data,
1592                                        sizeof(long));
1593                         else
1594                                 child->thread.fp_state.fpscr = data;
1595                         ret = 0;
1596                 }
1597                 break;
1598         }
1599
1600         case PPC_PTRACE_GETHWDBGINFO: {
1601                 struct ppc_debug_info dbginfo;
1602
1603                 dbginfo.version = 1;
1604 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1605                 dbginfo.num_instruction_bps = CONFIG_PPC_ADV_DEBUG_IACS;
1606                 dbginfo.num_data_bps = CONFIG_PPC_ADV_DEBUG_DACS;
1607                 dbginfo.num_condition_regs = CONFIG_PPC_ADV_DEBUG_DVCS;
1608                 dbginfo.data_bp_alignment = 4;
1609                 dbginfo.sizeof_condition = 4;
1610                 dbginfo.features = PPC_DEBUG_FEATURE_INSN_BP_RANGE |
1611                                    PPC_DEBUG_FEATURE_INSN_BP_MASK;
1612 #ifdef CONFIG_PPC_ADV_DEBUG_DAC_RANGE
1613                 dbginfo.features |=
1614                                    PPC_DEBUG_FEATURE_DATA_BP_RANGE |
1615                                    PPC_DEBUG_FEATURE_DATA_BP_MASK;
1616 #endif
1617 #else /* !CONFIG_PPC_ADV_DEBUG_REGS */
1618                 dbginfo.num_instruction_bps = 0;
1619                 dbginfo.num_data_bps = 1;
1620                 dbginfo.num_condition_regs = 0;
1621 #ifdef CONFIG_PPC64
1622                 dbginfo.data_bp_alignment = 8;
1623 #else
1624                 dbginfo.data_bp_alignment = 4;
1625 #endif
1626                 dbginfo.sizeof_condition = 0;
1627 #ifdef CONFIG_HAVE_HW_BREAKPOINT
1628                 dbginfo.features = PPC_DEBUG_FEATURE_DATA_BP_RANGE;
1629                 if (cpu_has_feature(CPU_FTR_DAWR))
1630                         dbginfo.features |= PPC_DEBUG_FEATURE_DATA_BP_DAWR;
1631 #else
1632                 dbginfo.features = 0;
1633 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
1634 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
1635
1636                 if (!access_ok(VERIFY_WRITE, datavp,
1637                                sizeof(struct ppc_debug_info)))
1638                         return -EFAULT;
1639                 ret = __copy_to_user(datavp, &dbginfo,
1640                                      sizeof(struct ppc_debug_info)) ?
1641                       -EFAULT : 0;
1642                 break;
1643         }
1644
1645         case PPC_PTRACE_SETHWDEBUG: {
1646                 struct ppc_hw_breakpoint bp_info;
1647
1648                 if (!access_ok(VERIFY_READ, datavp,
1649                                sizeof(struct ppc_hw_breakpoint)))
1650                         return -EFAULT;
1651                 ret = __copy_from_user(&bp_info, datavp,
1652                                        sizeof(struct ppc_hw_breakpoint)) ?
1653                       -EFAULT : 0;
1654                 if (!ret)
1655                         ret = ppc_set_hwdebug(child, &bp_info);
1656                 break;
1657         }
1658
1659         case PPC_PTRACE_DELHWDEBUG: {
1660                 ret = ppc_del_hwdebug(child, data);
1661                 break;
1662         }
1663
1664         case PTRACE_GET_DEBUGREG: {
1665 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
1666                 unsigned long dabr_fake;
1667 #endif
1668                 ret = -EINVAL;
1669                 /* We only support one DABR and no IABRS at the moment */
1670                 if (addr > 0)
1671                         break;
1672 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
1673                 ret = put_user(child->thread.debug.dac1, datalp);
1674 #else
1675                 dabr_fake = ((child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) |
1676                              (child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
1677                 ret = put_user(dabr_fake, datalp);
1678 #endif
1679                 break;
1680         }
1681
1682         case PTRACE_SET_DEBUGREG:
1683                 ret = ptrace_set_debugreg(child, addr, data);
1684                 break;
1685
1686 #ifdef CONFIG_PPC64
1687         case PTRACE_GETREGS64:
1688 #endif
1689         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
1690                 return copy_regset_to_user(child, &user_ppc_native_view,
1691                                            REGSET_GPR,
1692                                            0, sizeof(struct pt_regs),
1693                                            datavp);
1694
1695 #ifdef CONFIG_PPC64
1696         case PTRACE_SETREGS64:
1697 #endif
1698         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
1699                 return copy_regset_from_user(child, &user_ppc_native_view,
1700                                              REGSET_GPR,
1701                                              0, sizeof(struct pt_regs),
1702                                              datavp);
1703
1704         case PTRACE_GETFPREGS: /* Get the child FPU state (FPR0...31 + FPSCR) */
1705                 return copy_regset_to_user(child, &user_ppc_native_view,
1706                                            REGSET_FPR,
1707                                            0, sizeof(elf_fpregset_t),
1708                                            datavp);
1709
1710         case PTRACE_SETFPREGS: /* Set the child FPU state (FPR0...31 + FPSCR) */
1711                 return copy_regset_from_user(child, &user_ppc_native_view,
1712                                              REGSET_FPR,
1713                                              0, sizeof(elf_fpregset_t),
1714                                              datavp);
1715
1716 #ifdef CONFIG_ALTIVEC
1717         case PTRACE_GETVRREGS:
1718                 return copy_regset_to_user(child, &user_ppc_native_view,
1719                                            REGSET_VMX,
1720                                            0, (33 * sizeof(vector128) +
1721                                                sizeof(u32)),
1722                                            datavp);
1723
1724         case PTRACE_SETVRREGS:
1725                 return copy_regset_from_user(child, &user_ppc_native_view,
1726                                              REGSET_VMX,
1727                                              0, (33 * sizeof(vector128) +
1728                                                  sizeof(u32)),
1729                                              datavp);
1730 #endif
1731 #ifdef CONFIG_VSX
1732         case PTRACE_GETVSRREGS:
1733                 return copy_regset_to_user(child, &user_ppc_native_view,
1734                                            REGSET_VSX,
1735                                            0, 32 * sizeof(double),
1736                                            datavp);
1737
1738         case PTRACE_SETVSRREGS:
1739                 return copy_regset_from_user(child, &user_ppc_native_view,
1740                                              REGSET_VSX,
1741                                              0, 32 * sizeof(double),
1742                                              datavp);
1743 #endif
1744 #ifdef CONFIG_SPE
1745         case PTRACE_GETEVRREGS:
1746                 /* Get the child spe register state. */
1747                 return copy_regset_to_user(child, &user_ppc_native_view,
1748                                            REGSET_SPE, 0, 35 * sizeof(u32),
1749                                            datavp);
1750
1751         case PTRACE_SETEVRREGS:
1752                 /* Set the child spe register state. */
1753                 return copy_regset_from_user(child, &user_ppc_native_view,
1754                                              REGSET_SPE, 0, 35 * sizeof(u32),
1755                                              datavp);
1756 #endif
1757
1758         default:
1759                 ret = ptrace_request(child, request, addr, data);
1760                 break;
1761         }
1762         return ret;
1763 }
1764
1765 /*
1766  * We must return the syscall number to actually look up in the table.
1767  * This can be -1L to skip running any syscall at all.
1768  */
1769 long do_syscall_trace_enter(struct pt_regs *regs)
1770 {
1771         long ret = 0;
1772
1773         user_exit();
1774
1775         secure_computing_strict(regs->gpr[0]);
1776
1777         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
1778             tracehook_report_syscall_entry(regs))
1779                 /*
1780                  * Tracing decided this syscall should not happen.
1781                  * We'll return a bogus call number to get an ENOSYS
1782                  * error, but leave the original number in regs->gpr[0].
1783                  */
1784                 ret = -1L;
1785
1786         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1787                 trace_sys_enter(regs, regs->gpr[0]);
1788
1789 #ifdef CONFIG_PPC64
1790         if (!is_32bit_task())
1791                 audit_syscall_entry(AUDIT_ARCH_PPC64,
1792                                     regs->gpr[0],
1793                                     regs->gpr[3], regs->gpr[4],
1794                                     regs->gpr[5], regs->gpr[6]);
1795         else
1796 #endif
1797                 audit_syscall_entry(AUDIT_ARCH_PPC,
1798                                     regs->gpr[0],
1799                                     regs->gpr[3] & 0xffffffff,
1800                                     regs->gpr[4] & 0xffffffff,
1801                                     regs->gpr[5] & 0xffffffff,
1802                                     regs->gpr[6] & 0xffffffff);
1803
1804         return ret ?: regs->gpr[0];
1805 }
1806
1807 void do_syscall_trace_leave(struct pt_regs *regs)
1808 {
1809         int step;
1810
1811         audit_syscall_exit(regs);
1812
1813         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1814                 trace_sys_exit(regs, regs->result);
1815
1816         step = test_thread_flag(TIF_SINGLESTEP);
1817         if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1818                 tracehook_report_syscall_exit(regs, step);
1819
1820         user_enter();
1821 }