arch/x86/kernel/ptrace.c

   1 /* By Ross Biro 1/23/92 */
   2 /*
   3  * Pentium III FXSR, SSE support
   4  *      Gareth Hughes <gareth@valinux.com>, May 2000
   5  *
   6  * BTS tracing
   7  *      Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/smp.h>
  14 #include <linux/errno.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/regset.h>
  17 #include <linux/user.h>
  18 #include <linux/elf.h>
  19 #include <linux/security.h>
  20 #include <linux/audit.h>
  21 #include <linux/seccomp.h>
  22 #include <linux/signal.h>
  23
  24 #include <asm/uaccess.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/system.h>
  27 #include <asm/processor.h>
  28 #include <asm/i387.h>
  29 #include <asm/debugreg.h>
  30 #include <asm/ldt.h>
  31 #include <asm/desc.h>
  32 #include <asm/prctl.h>
  33 #include <asm/proto.h>
  34 #include <asm/ds.h>
  35
  36 #include "tls.h"
  37
  38 enum x86_regset {
  39         REGSET_GENERAL,
  40         REGSET_FP,
  41         REGSET_XFP,
  42         REGSET_TLS,
  43 };
  44
  45 /*
  46  * does not yet catch signals sent when the child dies.
  47  * in exit.c or in signal.c.
  48  */
  49
  50 /*
  51  * Determines which flags the user has access to [1 = access, 0 = no access].
  52  */
  53 #define FLAG_MASK_32            ((unsigned long)                        \
  54                                  (X86_EFLAGS_CF | X86_EFLAGS_PF |       \
  55                                   X86_EFLAGS_AF | X86_EFLAGS_ZF |       \
  56                                   X86_EFLAGS_SF | X86_EFLAGS_TF |       \
  57                                   X86_EFLAGS_DF | X86_EFLAGS_OF |       \
  58                                   X86_EFLAGS_RF | X86_EFLAGS_AC))
  59
  60 /*
  61  * Determines whether a value may be installed in a segment register.
  62  */
  63 static inline bool invalid_selector(u16 value)
  64 {
  65         return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
  66 }
  67
  68 #ifdef CONFIG_X86_32
  69
  70 #define FLAG_MASK               FLAG_MASK_32
  71
  72 static long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
  73 {
  74         BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
  75         regno >>= 2;
  76         if (regno > FS)
  77                 --regno;
  78         return &regs->bx + regno;
  79 }
  80
  81 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
  82 {
  83         /*
  84          * Returning the value truncates it to 16 bits.
  85          */
  86         unsigned int retval;
  87         if (offset != offsetof(struct user_regs_struct, gs))
  88                 retval = *pt_regs_access(task_pt_regs(task), offset);
  89         else {
  90                 retval = task->thread.gs;
  91                 if (task == current)
  92                         savesegment(gs, retval);
  93         }
  94         return retval;
  95 }
  96
  97 static int set_segment_reg(struct task_struct *task,
  98                            unsigned long offset, u16 value)
  99 {
 100         /*
 101          * The value argument was already truncated to 16 bits.
 102          */
 103         if (invalid_selector(value))
 104                 return -EIO;
 105
 106         /*
 107          * For %cs and %ss we cannot permit a null selector.
 108          * We can permit a bogus selector as long as it has USER_RPL.
 109          * Null selectors are fine for other segment registers, but
 110          * we will never get back to user mode with invalid %cs or %ss
 111          * and will take the trap in iret instead.  Much code relies
 112          * on user_mode() to distinguish a user trap frame (which can
 113          * safely use invalid selectors) from a kernel trap frame.
 114          */
 115         switch (offset) {
 116         case offsetof(struct user_regs_struct, cs):
 117         case offsetof(struct user_regs_struct, ss):
 118                 if (unlikely(value == 0))
 119                         return -EIO;
 120
 121         default:
 122                 *pt_regs_access(task_pt_regs(task), offset) = value;
 123                 break;
 124
 125         case offsetof(struct user_regs_struct, gs):
 126                 task->thread.gs = value;
 127                 if (task == current)
 128                         /*
 129                          * The user-mode %gs is not affected by
 130                          * kernel entry, so we must update the CPU.
 131                          */
 132                         loadsegment(gs, value);
 133         }
 134
 135         return 0;
 136 }
 137
 138 static unsigned long debugreg_addr_limit(struct task_struct *task)
 139 {
 140         return TASK_SIZE - 3;
 141 }
 142
 143 #else  /* CONFIG_X86_64 */
 144
 145 #define FLAG_MASK               (FLAG_MASK_32 | X86_EFLAGS_NT)
 146
 147 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
 148 {
 149         BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
 150         return &regs->r15 + (offset / sizeof(regs->r15));
 151 }
 152
 153 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
 154 {
 155         /*
 156          * Returning the value truncates it to 16 bits.
 157          */
 158         unsigned int seg;
 159
 160         switch (offset) {
 161         case offsetof(struct user_regs_struct, fs):
 162                 if (task == current) {
 163                         /* Older gas can't assemble movq %?s,%r?? */
 164                         asm("movl %%fs,%0" : "=r" (seg));
 165                         return seg;
 166                 }
 167                 return task->thread.fsindex;
 168         case offsetof(struct user_regs_struct, gs):
 169                 if (task == current) {
 170                         asm("movl %%gs,%0" : "=r" (seg));
 171                         return seg;
 172                 }
 173                 return task->thread.gsindex;
 174         case offsetof(struct user_regs_struct, ds):
 175                 if (task == current) {
 176                         asm("movl %%ds,%0" : "=r" (seg));
 177                         return seg;
 178                 }
 179                 return task->thread.ds;
 180         case offsetof(struct user_regs_struct, es):
 181                 if (task == current) {
 182                         asm("movl %%es,%0" : "=r" (seg));
 183                         return seg;
 184                 }
 185                 return task->thread.es;
 186
 187         case offsetof(struct user_regs_struct, cs):
 188         case offsetof(struct user_regs_struct, ss):
 189                 break;
 190         }
 191         return *pt_regs_access(task_pt_regs(task), offset);
 192 }
 193
 194 static int set_segment_reg(struct task_struct *task,
 195                            unsigned long offset, u16 value)
 196 {
 197         /*
 198          * The value argument was already truncated to 16 bits.
 199          */
 200         if (invalid_selector(value))
 201                 return -EIO;
 202
 203         switch (offset) {
 204         case offsetof(struct user_regs_struct,fs):
 205                 /*
 206                  * If this is setting fs as for normal 64-bit use but
 207                  * setting fs_base has implicitly changed it, leave it.
 208                  */
 209                 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
 210                      task->thread.fs != 0) ||
 211                     (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
 212                      task->thread.fs == 0))
 213                         break;
 214                 task->thread.fsindex = value;
 215                 if (task == current)
 216                         loadsegment(fs, task->thread.fsindex);
 217                 break;
 218         case offsetof(struct user_regs_struct,gs):
 219                 /*
 220                  * If this is setting gs as for normal 64-bit use but
 221                  * setting gs_base has implicitly changed it, leave it.
 222                  */
 223                 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
 224                      task->thread.gs != 0) ||
 225                     (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
 226                      task->thread.gs == 0))
 227                         break;
 228                 task->thread.gsindex = value;
 229                 if (task == current)
 230                         load_gs_index(task->thread.gsindex);
 231                 break;
 232         case offsetof(struct user_regs_struct,ds):
 233                 task->thread.ds = value;
 234                 if (task == current)
 235                         loadsegment(ds, task->thread.ds);
 236                 break;
 237         case offsetof(struct user_regs_struct,es):
 238                 task->thread.es = value;
 239                 if (task == current)
 240                         loadsegment(es, task->thread.es);
 241                 break;
 242
 243                 /*
 244                  * Can't actually change these in 64-bit mode.
 245                  */
 246         case offsetof(struct user_regs_struct,cs):
 247                 if (unlikely(value == 0))
 248                         return -EIO;
 249 #ifdef CONFIG_IA32_EMULATION
 250                 if (test_tsk_thread_flag(task, TIF_IA32))
 251                         task_pt_regs(task)->cs = value;
 252 #endif
 253                 break;
 254         case offsetof(struct user_regs_struct,ss):
 255                 if (unlikely(value == 0))
 256                         return -EIO;
 257 #ifdef CONFIG_IA32_EMULATION
 258                 if (test_tsk_thread_flag(task, TIF_IA32))
 259                         task_pt_regs(task)->ss = value;
 260 #endif
 261                 break;
 262         }
 263
 264         return 0;
 265 }
 266
 267 static unsigned long debugreg_addr_limit(struct task_struct *task)
 268 {
 269 #ifdef CONFIG_IA32_EMULATION
 270         if (test_tsk_thread_flag(task, TIF_IA32))
 271                 return IA32_PAGE_OFFSET - 3;
 272 #endif
 273         return TASK_SIZE64 - 7;
 274 }
 275
 276 #endif  /* CONFIG_X86_32 */
 277
 278 static unsigned long get_flags(struct task_struct *task)
 279 {
 280         unsigned long retval = task_pt_regs(task)->flags;
 281
 282         /*
 283          * If the debugger set TF, hide it from the readout.
 284          */
 285         if (test_tsk_thread_flag(task, TIF_FORCED_TF))
 286                 retval &= ~X86_EFLAGS_TF;
 287
 288         return retval;
 289 }
 290
 291 static int set_flags(struct task_struct *task, unsigned long value)
 292 {
 293         struct pt_regs *regs = task_pt_regs(task);
 294
 295         /*
 296          * If the user value contains TF, mark that
 297          * it was not "us" (the debugger) that set it.
 298          * If not, make sure it stays set if we had.
 299          */
 300         if (value & X86_EFLAGS_TF)
 301                 clear_tsk_thread_flag(task, TIF_FORCED_TF);
 302         else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
 303                 value |= X86_EFLAGS_TF;
 304
 305         regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
 306
 307         return 0;
 308 }
 309
 310 static int putreg(struct task_struct *child,
 311                   unsigned long offset, unsigned long value)
 312 {
 313         switch (offset) {
 314         case offsetof(struct user_regs_struct, cs):
 315         case offsetof(struct user_regs_struct, ds):
 316         case offsetof(struct user_regs_struct, es):
 317         case offsetof(struct user_regs_struct, fs):
 318         case offsetof(struct user_regs_struct, gs):
 319         case offsetof(struct user_regs_struct, ss):
 320                 return set_segment_reg(child, offset, value);
 321
 322         case offsetof(struct user_regs_struct, flags):
 323                 return set_flags(child, value);
 324
 325 #ifdef CONFIG_X86_64
 326 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
 327 =======
 328         /*
 329          * Orig_ax is really just a flag with small positive and
 330          * negative values, so make sure to always sign-extend it
 331          * from 32 bits so that it works correctly regardless of
 332          * whether we come from a 32-bit environment or not.
 333          */
 334         case offsetof(struct user_regs_struct, orig_ax):
 335                 value = (long) (s32) value;
 336                 break;
 337
 338 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
 339         case offsetof(struct user_regs_struct,fs_base):
 340                 if (value >= TASK_SIZE_OF(child))
 341                         return -EIO;
 342                 /*
 343                  * When changing the segment base, use do_arch_prctl
 344                  * to set either thread.fs or thread.fsindex and the
 345                  * corresponding GDT slot.
 346                  */
 347                 if (child->thread.fs != value)
 348                         return do_arch_prctl(child, ARCH_SET_FS, value);
 349                 return 0;
 350         case offsetof(struct user_regs_struct,gs_base):
 351                 /*
 352                  * Exactly the same here as the %fs handling above.
 353                  */
 354                 if (value >= TASK_SIZE_OF(child))
 355                         return -EIO;
 356                 if (child->thread.gs != value)
 357                         return do_arch_prctl(child, ARCH_SET_GS, value);
 358                 return 0;
 359 #endif
 360         }
 361
 362         *pt_regs_access(task_pt_regs(child), offset) = value;
 363         return 0;
 364 }
 365
 366 static unsigned long getreg(struct task_struct *task, unsigned long offset)
 367 {
 368         switch (offset) {
 369         case offsetof(struct user_regs_struct, cs):
 370         case offsetof(struct user_regs_struct, ds):
 371         case offsetof(struct user_regs_struct, es):
 372         case offsetof(struct user_regs_struct, fs):
 373         case offsetof(struct user_regs_struct, gs):
 374         case offsetof(struct user_regs_struct, ss):
 375                 return get_segment_reg(task, offset);
 376
 377         case offsetof(struct user_regs_struct, flags):
 378                 return get_flags(task);
 379
 380 #ifdef CONFIG_X86_64
 381         case offsetof(struct user_regs_struct, fs_base): {
 382                 /*
 383                  * do_arch_prctl may have used a GDT slot instead of
 384                  * the MSR.  To userland, it appears the same either
 385                  * way, except the %fs segment selector might not be 0.
 386                  */
 387                 unsigned int seg = task->thread.fsindex;
 388                 if (task->thread.fs != 0)
 389                         return task->thread.fs;
 390                 if (task == current)
 391                         asm("movl %%fs,%0" : "=r" (seg));
 392                 if (seg != FS_TLS_SEL)
 393                         return 0;
 394                 return get_desc_base(&task->thread.tls_array[FS_TLS]);
 395         }
 396         case offsetof(struct user_regs_struct, gs_base): {
 397                 /*
 398                  * Exactly the same here as the %fs handling above.
 399                  */
 400                 unsigned int seg = task->thread.gsindex;
 401                 if (task->thread.gs != 0)
 402                         return task->thread.gs;
 403                 if (task == current)
 404                         asm("movl %%gs,%0" : "=r" (seg));
 405                 if (seg != GS_TLS_SEL)
 406                         return 0;
 407                 return get_desc_base(&task->thread.tls_array[GS_TLS]);
 408         }
 409 #endif
 410         }
 411
 412         return *pt_regs_access(task_pt_regs(task), offset);
 413 }
 414
 415 static int genregs_get(struct task_struct *target,
 416                        const struct user_regset *regset,
 417                        unsigned int pos, unsigned int count,
 418                        void *kbuf, void __user *ubuf)
 419 {
 420         if (kbuf) {
 421                 unsigned long *k = kbuf;
 422                 while (count > 0) {
 423                         *k++ = getreg(target, pos);
 424                         count -= sizeof(*k);
 425                         pos += sizeof(*k);
 426                 }
 427         } else {
 428                 unsigned long __user *u = ubuf;
 429                 while (count > 0) {
 430                         if (__put_user(getreg(target, pos), u++))
 431                                 return -EFAULT;
 432                         count -= sizeof(*u);
 433                         pos += sizeof(*u);
 434                 }
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int genregs_set(struct task_struct *target,
 441                        const struct user_regset *regset,
 442                        unsigned int pos, unsigned int count,
 443                        const void *kbuf, const void __user *ubuf)
 444 {
 445         int ret = 0;
 446         if (kbuf) {
 447                 const unsigned long *k = kbuf;
 448                 while (count > 0 && !ret) {
 449                         ret = putreg(target, pos, *k++);
 450                         count -= sizeof(*k);
 451                         pos += sizeof(*k);
 452                 }
 453         } else {
 454                 const unsigned long  __user *u = ubuf;
 455                 while (count > 0 && !ret) {
 456                         unsigned long word;
 457                         ret = __get_user(word, u++);
 458                         if (ret)
 459                                 break;
 460                         ret = putreg(target, pos, word);
 461                         count -= sizeof(*u);
 462                         pos += sizeof(*u);
 463                 }
 464         }
 465         return ret;
 466 }
 467
 468 /*
 469  * This function is trivial and will be inlined by the compiler.
 470  * Having it separates the implementation details of debug
 471  * registers from the interface details of ptrace.
 472  */
 473 static unsigned long ptrace_get_debugreg(struct task_struct *child, int n)
 474 {
 475         switch (n) {
 476         case 0:         return child->thread.debugreg0;
 477         case 1:         return child->thread.debugreg1;
 478         case 2:         return child->thread.debugreg2;
 479         case 3:         return child->thread.debugreg3;
 480         case 6:         return child->thread.debugreg6;
 481         case 7:         return child->thread.debugreg7;
 482         }
 483         return 0;
 484 }
 485
 486 static int ptrace_set_debugreg(struct task_struct *child,
 487                                int n, unsigned long data)
 488 {
 489         int i;
 490
 491         if (unlikely(n == 4 || n == 5))
 492                 return -EIO;
 493
 494         if (n < 4 && unlikely(data >= debugreg_addr_limit(child)))
 495                 return -EIO;
 496
 497         switch (n) {
 498         case 0:         child->thread.debugreg0 = data; break;
 499         case 1:         child->thread.debugreg1 = data; break;
 500         case 2:         child->thread.debugreg2 = data; break;
 501         case 3:         child->thread.debugreg3 = data; break;
 502
 503         case 6:
 504                 if ((data & ~0xffffffffUL) != 0)
 505                         return -EIO;
 506                 child->thread.debugreg6 = data;
 507                 break;
 508
 509         case 7:
 510                 /*
 511                  * Sanity-check data. Take one half-byte at once with
 512                  * check = (val >> (16 + 4*i)) & 0xf. It contains the
 513                  * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
 514                  * 2 and 3 are LENi. Given a list of invalid values,
 515                  * we do mask |= 1 << invalid_value, so that
 516                  * (mask >> check) & 1 is a correct test for invalid
 517                  * values.
 518                  *
 519                  * R/Wi contains the type of the breakpoint /
 520                  * watchpoint, LENi contains the length of the watched
 521                  * data in the watchpoint case.
 522                  *
 523                  * The invalid values are:
 524                  * - LENi == 0x10 (undefined), so mask |= 0x0f00.       [32-bit]
 525                  * - R/Wi == 0x10 (break on I/O reads or writes), so
 526                  *   mask |= 0x4444.
 527                  * - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
 528                  *   0x1110.
 529                  *
 530                  * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
 531                  *
 532                  * See the Intel Manual "System Programming Guide",
 533                  * 15.2.4
 534                  *
 535                  * Note that LENi == 0x10 is defined on x86_64 in long
 536                  * mode (i.e. even for 32-bit userspace software, but
 537                  * 64-bit kernel), so the x86_64 mask value is 0x5454.
 538                  * See the AMD manual no. 24593 (AMD64 System Programming)
 539                  */
 540 #ifdef CONFIG_X86_32
 541 #define DR7_MASK        0x5f54
 542 #else
 543 #define DR7_MASK        0x5554
 544 #endif
 545                 data &= ~DR_CONTROL_RESERVED;
 546                 for (i = 0; i < 4; i++)
 547                         if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1)
 548                                 return -EIO;
 549                 child->thread.debugreg7 = data;
 550                 if (data)
 551                         set_tsk_thread_flag(child, TIF_DEBUG);
 552                 else
 553                         clear_tsk_thread_flag(child, TIF_DEBUG);
 554                 break;
 555         }
 556
 557         return 0;
 558 }
 559
 560 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
 561 =======
 562 #ifdef X86_BTS
 563
 564 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
 565 static int ptrace_bts_get_size(struct task_struct *child)
 566 {
 567         if (!child->thread.ds_area_msr)
 568                 return -ENXIO;
 569
 570         return ds_get_bts_index((void *)child->thread.ds_area_msr);
 571 }
 572
 573 static int ptrace_bts_read_record(struct task_struct *child,
 574                                   long index,
 575                                   struct bts_struct __user *out)
 576 {
 577         struct bts_struct ret;
 578         int retval;
 579         int bts_end;
 580         int bts_index;
 581
 582         if (!child->thread.ds_area_msr)
 583                 return -ENXIO;
 584
 585         if (index < 0)
 586                 return -EINVAL;
 587
 588         bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr);
 589         if (bts_end <= index)
 590                 return -EINVAL;
 591
 592         /* translate the ptrace bts index into the ds bts index */
 593         bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr);
 594         bts_index -= (index + 1);
 595         if (bts_index < 0)
 596                 bts_index += bts_end;
 597
 598         retval = ds_read_bts((void *)child->thread.ds_area_msr,
 599                              bts_index, &ret);
 600         if (retval < 0)
 601                 return retval;
 602
 603         if (copy_to_user(out, &ret, sizeof(ret)))
 604                 return -EFAULT;
 605
 606         return sizeof(ret);
 607 }
 608
 609 static int ptrace_bts_write_record(struct task_struct *child,
 610                                    const struct bts_struct *in)
 611 {
 612         int retval;
 613
 614         if (!child->thread.ds_area_msr)
 615                 return -ENXIO;
 616
 617         retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
 618         if (retval)
 619                 return retval;
 620
 621         return sizeof(*in);
 622 }
 623
 624 static int ptrace_bts_clear(struct task_struct *child)
 625 {
 626         if (!child->thread.ds_area_msr)
 627                 return -ENXIO;
 628
 629         return ds_clear((void *)child->thread.ds_area_msr);
 630 }
 631
 632 static int ptrace_bts_drain(struct task_struct *child,
 633                             long size,
 634                             struct bts_struct __user *out)
 635 {
 636         int end, i;
 637         void *ds = (void *)child->thread.ds_area_msr;
 638
 639         if (!ds)
 640                 return -ENXIO;
 641
 642         end = ds_get_bts_index(ds);
 643         if (end <= 0)
 644                 return end;
 645
 646         if (size < (end * sizeof(struct bts_struct)))
 647                 return -EIO;
 648
 649         for (i = 0; i < end; i++, out++) {
 650                 struct bts_struct ret;
 651                 int retval;
 652
 653                 retval = ds_read_bts(ds, i, &ret);
 654                 if (retval < 0)
 655                         return retval;
 656
 657                 if (copy_to_user(out, &ret, sizeof(ret)))
 658                         return -EFAULT;
 659         }
 660
 661         ds_clear(ds);
 662
 663         return end;
 664 }
 665
 666 static int ptrace_bts_realloc(struct task_struct *child,
 667                               int size, int reduce_size)
 668 {
 669         unsigned long rlim, vm;
 670         int ret, old_size;
 671
 672         if (size < 0)
 673                 return -EINVAL;
 674
 675         old_size = ds_get_bts_size((void *)child->thread.ds_area_msr);
 676         if (old_size < 0)
 677                 return old_size;
 678
 679         ret = ds_free((void **)&child->thread.ds_area_msr);
 680         if (ret < 0)
 681                 goto out;
 682
 683         size >>= PAGE_SHIFT;
 684         old_size >>= PAGE_SHIFT;
 685
 686         current->mm->total_vm  -= old_size;
 687         current->mm->locked_vm -= old_size;
 688
 689         if (size == 0)
 690                 goto out;
 691
 692         rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
 693         vm = current->mm->total_vm  + size;
 694         if (rlim < vm) {
 695                 ret = -ENOMEM;
 696
 697                 if (!reduce_size)
 698                         goto out;
 699
 700                 size = rlim - current->mm->total_vm;
 701                 if (size <= 0)
 702                         goto out;
 703         }
 704
 705         rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
 706         vm = current->mm->locked_vm  + size;
 707         if (rlim < vm) {
 708                 ret = -ENOMEM;
 709
 710                 if (!reduce_size)
 711                         goto out;
 712
 713                 size = rlim - current->mm->locked_vm;
 714                 if (size <= 0)
 715                         goto out;
 716         }
 717
 718         ret = ds_allocate((void **)&child->thread.ds_area_msr,
 719                           size << PAGE_SHIFT);
 720         if (ret < 0)
 721                 goto out;
 722
 723         current->mm->total_vm  += size;
 724         current->mm->locked_vm += size;
 725
 726 out:
 727         if (child->thread.ds_area_msr)
 728                 set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
 729         else
 730                 clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
 731
 732         return ret;
 733 }
 734
 735 static int ptrace_bts_config(struct task_struct *child,
 736                              long cfg_size,
 737                              const struct ptrace_bts_config __user *ucfg)
 738 {
 739         struct ptrace_bts_config cfg;
 740         int bts_size, ret = 0;
 741         void *ds;
 742
 743         if (cfg_size < sizeof(cfg))
 744                 return -EIO;
 745
 746         if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
 747                 return -EFAULT;
 748
 749         if ((int)cfg.size < 0)
 750                 return -EINVAL;
 751
 752         bts_size = 0;
 753         ds = (void *)child->thread.ds_area_msr;
 754         if (ds) {
 755                 bts_size = ds_get_bts_size(ds);
 756                 if (bts_size < 0)
 757                         return bts_size;
 758         }
 759         cfg.size = PAGE_ALIGN(cfg.size);
 760
 761         if (bts_size != cfg.size) {
 762                 ret = ptrace_bts_realloc(child, cfg.size,
 763                                          cfg.flags & PTRACE_BTS_O_CUT_SIZE);
 764                 if (ret < 0)
 765                         goto errout;
 766
 767                 ds = (void *)child->thread.ds_area_msr;
 768         }
 769
 770         if (cfg.flags & PTRACE_BTS_O_SIGNAL)
 771                 ret = ds_set_overflow(ds, DS_O_SIGNAL);
 772         else
 773                 ret = ds_set_overflow(ds, DS_O_WRAP);
 774         if (ret < 0)
 775                 goto errout;
 776
 777         if (cfg.flags & PTRACE_BTS_O_TRACE)
 778                 child->thread.debugctlmsr |= ds_debugctl_mask();
 779         else
 780                 child->thread.debugctlmsr &= ~ds_debugctl_mask();
 781
 782         if (cfg.flags & PTRACE_BTS_O_SCHED)
 783                 set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
 784         else
 785                 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
 786
 787         ret = sizeof(cfg);
 788
 789 out:
 790         if (child->thread.debugctlmsr)
 791                 set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
 792         else
 793                 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
 794
 795         return ret;
 796
 797 errout:
 798         child->thread.debugctlmsr &= ~ds_debugctl_mask();
 799         clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
 800         goto out;
 801 }
 802
 803 static int ptrace_bts_status(struct task_struct *child,
 804                              long cfg_size,
 805                              struct ptrace_bts_config __user *ucfg)
 806 {
 807         void *ds = (void *)child->thread.ds_area_msr;
 808         struct ptrace_bts_config cfg;
 809
 810         if (cfg_size < sizeof(cfg))
 811                 return -EIO;
 812
 813         memset(&cfg, 0, sizeof(cfg));
 814
 815         if (ds) {
 816                 cfg.size = ds_get_bts_size(ds);
 817
 818                 if (ds_get_overflow(ds) == DS_O_SIGNAL)
 819                         cfg.flags |= PTRACE_BTS_O_SIGNAL;
 820
 821                 if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
 822                     child->thread.debugctlmsr & ds_debugctl_mask())
 823                         cfg.flags |= PTRACE_BTS_O_TRACE;
 824
 825                 if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
 826                         cfg.flags |= PTRACE_BTS_O_SCHED;
 827         }
 828
 829         cfg.bts_size = sizeof(struct bts_struct);
 830
 831         if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
 832                 return -EFAULT;
 833
 834         return sizeof(cfg);
 835 }
 836
 837 void ptrace_bts_take_timestamp(struct task_struct *tsk,
 838                                enum bts_qualifier qualifier)
 839 {
 840         struct bts_struct rec = {
 841                 .qualifier = qualifier,
 842                 .variant.jiffies = jiffies_64
 843         };
 844
 845         ptrace_bts_write_record(tsk, &rec);
 846 }
 847 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
 848 =======
 849 #endif /* X86_BTS */
 850 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
 851
 852 /*
 853  * Called by kernel/ptrace.c when detaching..
 854  *
 855  * Make sure the single step bit is not set.
 856  */
 857 void ptrace_disable(struct task_struct *child)
 858 {
 859         user_disable_single_step(child);
 860 #ifdef TIF_SYSCALL_EMU
 861         clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
 862 #endif
 863         if (child->thread.ds_area_msr) {
 864 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
 865 =======
 866 #ifdef X86_BTS
 867 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
 868                 ptrace_bts_realloc(child, 0, 0);
 869 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
 870 =======
 871 #endif
 872 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
 873                 child->thread.debugctlmsr &= ~ds_debugctl_mask();
 874                 if (!child->thread.debugctlmsr)
 875                         clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
 876                 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
 877         }
 878 }
 879
 880 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
 881 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
 882 #endif
 883
 884 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 885 {
 886         int ret;
 887         unsigned long __user *datap = (unsigned long __user *)data;
 888
 889         switch (request) {
 890         /* read the word at location addr in the USER area. */
 891         case PTRACE_PEEKUSR: {
 892                 unsigned long tmp;
 893
 894                 ret = -EIO;
 895                 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
 896                     addr >= sizeof(struct user))
 897                         break;
 898
 899                 tmp = 0;  /* Default return condition */
 900                 if (addr < sizeof(struct user_regs_struct))
 901                         tmp = getreg(child, addr);
 902                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
 903                          addr <= offsetof(struct user, u_debugreg[7])) {
 904                         addr -= offsetof(struct user, u_debugreg[0]);
 905                         tmp = ptrace_get_debugreg(child, addr / sizeof(data));
 906                 }
 907                 ret = put_user(tmp, datap);
 908                 break;
 909         }
 910
 911         case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
 912                 ret = -EIO;
 913                 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
 914                     addr >= sizeof(struct user))
 915                         break;
 916
 917                 if (addr < sizeof(struct user_regs_struct))
 918                         ret = putreg(child, addr, data);
 919                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
 920                          addr <= offsetof(struct user, u_debugreg[7])) {
 921                         addr -= offsetof(struct user, u_debugreg[0]);
 922                         ret = ptrace_set_debugreg(child,
 923                                                   addr / sizeof(data), data);
 924                 }
 925                 break;
 926
 927         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
 928                 return copy_regset_to_user(child,
 929                                            task_user_regset_view(current),
 930                                            REGSET_GENERAL,
 931                                            0, sizeof(struct user_regs_struct),
 932                                            datap);
 933
 934         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
 935                 return copy_regset_from_user(child,
 936                                              task_user_regset_view(current),
 937                                              REGSET_GENERAL,
 938                                              0, sizeof(struct user_regs_struct),
 939                                              datap);
 940
 941         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
 942                 return copy_regset_to_user(child,
 943                                            task_user_regset_view(current),
 944                                            REGSET_FP,
 945                                            0, sizeof(struct user_i387_struct),
 946                                            datap);
 947
 948         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
 949                 return copy_regset_from_user(child,
 950                                              task_user_regset_view(current),
 951                                              REGSET_FP,
 952                                              0, sizeof(struct user_i387_struct),
 953                                              datap);
 954
 955 #ifdef CONFIG_X86_32
 956         case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
 957                 return copy_regset_to_user(child, &user_x86_32_view,
 958                                            REGSET_XFP,
 959                                            0, sizeof(struct user_fxsr_struct),
 960                                            datap);
 961
 962         case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
 963                 return copy_regset_from_user(child, &user_x86_32_view,
 964                                              REGSET_XFP,
 965                                              0, sizeof(struct user_fxsr_struct),
 966                                              datap);
 967 #endif
 968
 969 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
 970         case PTRACE_GET_THREAD_AREA:
 971                 if (addr < 0)
 972                         return -EIO;
 973                 ret = do_get_thread_area(child, addr,
 974                                          (struct user_desc __user *) data);
 975                 break;
 976
 977         case PTRACE_SET_THREAD_AREA:
 978                 if (addr < 0)
 979                         return -EIO;
 980                 ret = do_set_thread_area(child, addr,
 981                                          (struct user_desc __user *) data, 0);
 982                 break;
 983 #endif
 984
 985 #ifdef CONFIG_X86_64
 986                 /* normal 64bit interface to access TLS data.
 987                    Works just like arch_prctl, except that the arguments
 988                    are reversed. */
 989         case PTRACE_ARCH_PRCTL:
 990                 ret = do_arch_prctl(child, data, addr);
 991                 break;
 992 #endif
 993
 994 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
 995 =======
 996         /*
 997          * These bits need more cooking - not enabled yet:
 998          */
 999 #ifdef X86_BTS
1000 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1001         case PTRACE_BTS_CONFIG:
1002                 ret = ptrace_bts_config
1003                         (child, data, (struct ptrace_bts_config __user *)addr);
1004                 break;
1005
1006         case PTRACE_BTS_STATUS:
1007                 ret = ptrace_bts_status
1008                         (child, data, (struct ptrace_bts_config __user *)addr);
1009                 break;
1010
1011         case PTRACE_BTS_SIZE:
1012                 ret = ptrace_bts_get_size(child);
1013                 break;
1014
1015         case PTRACE_BTS_GET:
1016                 ret = ptrace_bts_read_record
1017                         (child, data, (struct bts_struct __user *) addr);
1018                 break;
1019
1020         case PTRACE_BTS_CLEAR:
1021                 ret = ptrace_bts_clear(child);
1022                 break;
1023
1024         case PTRACE_BTS_DRAIN:
1025                 ret = ptrace_bts_drain
1026                         (child, data, (struct bts_struct __user *) addr);
1027                 break;
1028 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
1029 =======
1030 #endif
1031 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1032
1033         default:
1034                 ret = ptrace_request(child, request, addr, data);
1035                 break;
1036         }
1037
1038         return ret;
1039 }
1040
1041 #ifdef CONFIG_IA32_EMULATION
1042
1043 #include <linux/compat.h>
1044 #include <linux/syscalls.h>
1045 #include <asm/ia32.h>
1046 #include <asm/user32.h>
1047
1048 #define R32(l,q)                                                        \
1049         case offsetof(struct user32, regs.l):                           \
1050                 regs->q = value; break
1051
1052 #define SEG32(rs)                                                       \
1053         case offsetof(struct user32, regs.rs):                          \
1054                 return set_segment_reg(child,                           \
1055                                        offsetof(struct user_regs_struct, rs), \
1056                                        value);                          \
1057                 break
1058
1059 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
1060 {
1061         struct pt_regs *regs = task_pt_regs(child);
1062
1063         switch (regno) {
1064
1065         SEG32(cs);
1066         SEG32(ds);
1067         SEG32(es);
1068         SEG32(fs);
1069         SEG32(gs);
1070         SEG32(ss);
1071
1072         R32(ebx, bx);
1073         R32(ecx, cx);
1074         R32(edx, dx);
1075         R32(edi, di);
1076         R32(esi, si);
1077         R32(ebp, bp);
1078         R32(eax, ax);
1079 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
1080         R32(orig_eax, orig_ax);
1081 =======
1082 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1083         R32(eip, ip);
1084         R32(esp, sp);
1085
1086 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
1087 =======
1088         case offsetof(struct user32, regs.orig_eax):
1089                 /*
1090                  * Sign-extend the value so that orig_eax = -1
1091                  * causes (long)orig_ax < 0 tests to fire correctly.
1092                  */
1093                 regs->orig_ax = (long) (s32) value;
1094                 break;
1095
1096 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1097         case offsetof(struct user32, regs.eflags):
1098                 return set_flags(child, value);
1099
1100         case offsetof(struct user32, u_debugreg[0]) ...
1101                 offsetof(struct user32, u_debugreg[7]):
1102                 regno -= offsetof(struct user32, u_debugreg[0]);
1103                 return ptrace_set_debugreg(child, regno / 4, value);
1104
1105         default:
1106                 if (regno > sizeof(struct user32) || (regno & 3))
1107                         return -EIO;
1108
1109                 /*
1110                  * Other dummy fields in the virtual user structure
1111                  * are ignored
1112                  */
1113                 break;
1114         }
1115         return 0;
1116 }
1117
1118 #undef R32
1119 #undef SEG32
1120
1121 #define R32(l,q)                                                        \
1122         case offsetof(struct user32, regs.l):                           \
1123                 *val = regs->q; break
1124
1125 #define SEG32(rs)                                                       \
1126         case offsetof(struct user32, regs.rs):                          \
1127                 *val = get_segment_reg(child,                           \
1128                                        offsetof(struct user_regs_struct, rs)); \
1129                 break
1130
1131 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1132 {
1133         struct pt_regs *regs = task_pt_regs(child);
1134
1135         switch (regno) {
1136
1137         SEG32(ds);
1138         SEG32(es);
1139         SEG32(fs);
1140         SEG32(gs);
1141
1142         R32(cs, cs);
1143         R32(ss, ss);
1144         R32(ebx, bx);
1145         R32(ecx, cx);
1146         R32(edx, dx);
1147         R32(edi, di);
1148         R32(esi, si);
1149         R32(ebp, bp);
1150         R32(eax, ax);
1151         R32(orig_eax, orig_ax);
1152         R32(eip, ip);
1153         R32(esp, sp);
1154
1155         case offsetof(struct user32, regs.eflags):
1156                 *val = get_flags(child);
1157                 break;
1158
1159         case offsetof(struct user32, u_debugreg[0]) ...
1160                 offsetof(struct user32, u_debugreg[7]):
1161                 regno -= offsetof(struct user32, u_debugreg[0]);
1162                 *val = ptrace_get_debugreg(child, regno / 4);
1163                 break;
1164
1165         default:
1166                 if (regno > sizeof(struct user32) || (regno & 3))
1167                         return -EIO;
1168
1169                 /*
1170                  * Other dummy fields in the virtual user structure
1171                  * are ignored
1172                  */
1173                 *val = 0;
1174                 break;
1175         }
1176         return 0;
1177 }
1178
1179 #undef R32
1180 #undef SEG32
1181
1182 static int genregs32_get(struct task_struct *target,
1183                          const struct user_regset *regset,
1184                          unsigned int pos, unsigned int count,
1185                          void *kbuf, void __user *ubuf)
1186 {
1187         if (kbuf) {
1188                 compat_ulong_t *k = kbuf;
1189                 while (count > 0) {
1190                         getreg32(target, pos, k++);
1191                         count -= sizeof(*k);
1192                         pos += sizeof(*k);
1193                 }
1194         } else {
1195                 compat_ulong_t __user *u = ubuf;
1196                 while (count > 0) {
1197                         compat_ulong_t word;
1198                         getreg32(target, pos, &word);
1199                         if (__put_user(word, u++))
1200                                 return -EFAULT;
1201                         count -= sizeof(*u);
1202                         pos += sizeof(*u);
1203                 }
1204         }
1205
1206         return 0;
1207 }
1208
1209 static int genregs32_set(struct task_struct *target,
1210                          const struct user_regset *regset,
1211                          unsigned int pos, unsigned int count,
1212                          const void *kbuf, const void __user *ubuf)
1213 {
1214         int ret = 0;
1215         if (kbuf) {
1216                 const compat_ulong_t *k = kbuf;
1217                 while (count > 0 && !ret) {
1218 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
1219                         ret = putreg(target, pos, *k++);
1220 =======
1221                         ret = putreg32(target, pos, *k++);
1222 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1223                         count -= sizeof(*k);
1224                         pos += sizeof(*k);
1225                 }
1226         } else {
1227                 const compat_ulong_t __user *u = ubuf;
1228                 while (count > 0 && !ret) {
1229                         compat_ulong_t word;
1230                         ret = __get_user(word, u++);
1231                         if (ret)
1232                                 break;
1233 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
1234                         ret = putreg(target, pos, word);
1235 =======
1236                         ret = putreg32(target, pos, word);
1237 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1238                         count -= sizeof(*u);
1239                         pos += sizeof(*u);
1240                 }
1241         }
1242         return ret;
1243 }
1244
1245 static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
1246 {
1247         siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
1248         compat_siginfo_t __user *si32 = compat_ptr(data);
1249         siginfo_t ssi;
1250         int ret;
1251
1252         if (request == PTRACE_SETSIGINFO) {
1253                 memset(&ssi, 0, sizeof(siginfo_t));
1254                 ret = copy_siginfo_from_user32(&ssi, si32);
1255                 if (ret)
1256                         return ret;
1257                 if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
1258                         return -EFAULT;
1259         }
1260         ret = sys_ptrace(request, pid, addr, (unsigned long)si);
1261         if (ret)
1262                 return ret;
1263         if (request == PTRACE_GETSIGINFO) {
1264                 if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
1265                         return -EFAULT;
1266                 ret = copy_siginfo_to_user32(si32, &ssi);
1267         }
1268         return ret;
1269 }
1270
1271 asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
1272 {
1273         struct task_struct *child;
1274         struct pt_regs *childregs;
1275         void __user *datap = compat_ptr(data);
1276         int ret;
1277         __u32 val;
1278
1279         switch (request) {
1280         case PTRACE_TRACEME:
1281         case PTRACE_ATTACH:
1282         case PTRACE_KILL:
1283         case PTRACE_CONT:
1284         case PTRACE_SINGLESTEP:
1285         case PTRACE_SINGLEBLOCK:
1286         case PTRACE_DETACH:
1287         case PTRACE_SYSCALL:
1288         case PTRACE_OLDSETOPTIONS:
1289         case PTRACE_SETOPTIONS:
1290         case PTRACE_SET_THREAD_AREA:
1291         case PTRACE_GET_THREAD_AREA:
1292 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
1293 =======
1294 #ifdef X86_BTS
1295 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1296         case PTRACE_BTS_CONFIG:
1297         case PTRACE_BTS_STATUS:
1298         case PTRACE_BTS_SIZE:
1299         case PTRACE_BTS_GET:
1300         case PTRACE_BTS_CLEAR:
1301         case PTRACE_BTS_DRAIN:
1302 <<<<<<< HEAD:arch/x86/kernel/ptrace.c
1303 =======
1304 #endif
1305 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/ptrace.c
1306                 return sys_ptrace(request, pid, addr, data);
1307
1308         default:
1309                 return -EINVAL;
1310
1311         case PTRACE_PEEKTEXT:
1312         case PTRACE_PEEKDATA:
1313         case PTRACE_POKEDATA:
1314         case PTRACE_POKETEXT:
1315         case PTRACE_POKEUSR:
1316         case PTRACE_PEEKUSR:
1317         case PTRACE_GETREGS:
1318         case PTRACE_SETREGS:
1319         case PTRACE_SETFPREGS:
1320         case PTRACE_GETFPREGS:
1321         case PTRACE_SETFPXREGS:
1322         case PTRACE_GETFPXREGS:
1323         case PTRACE_GETEVENTMSG:
1324                 break;
1325
1326         case PTRACE_SETSIGINFO:
1327         case PTRACE_GETSIGINFO:
1328                 return ptrace32_siginfo(request, pid, addr, data);
1329         }
1330
1331         child = ptrace_get_task_struct(pid);
1332         if (IS_ERR(child))
1333                 return PTR_ERR(child);
1334
1335         ret = ptrace_check_attach(child, request == PTRACE_KILL);
1336         if (ret < 0)
1337                 goto out;
1338
1339         childregs = task_pt_regs(child);
1340
1341         switch (request) {
1342         case PTRACE_PEEKUSR:
1343                 ret = getreg32(child, addr, &val);
1344                 if (ret == 0)
1345                         ret = put_user(val, (__u32 __user *)datap);
1346                 break;
1347
1348         case PTRACE_POKEUSR:
1349                 ret = putreg32(child, addr, data);
1350                 break;
1351
1352         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
1353                 return copy_regset_to_user(child, &user_x86_32_view,
1354                                            REGSET_GENERAL,
1355                                            0, sizeof(struct user_regs_struct32),
1356                                            datap);
1357
1358         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
1359                 return copy_regset_from_user(child, &user_x86_32_view,
1360                                              REGSET_GENERAL, 0,
1361                                              sizeof(struct user_regs_struct32),
1362                                              datap);
1363
1364         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
1365                 return copy_regset_to_user(child, &user_x86_32_view,
1366                                            REGSET_FP, 0,
1367                                            sizeof(struct user_i387_ia32_struct),
1368                                            datap);
1369
1370         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
1371                 return copy_regset_from_user(
1372                         child, &user_x86_32_view, REGSET_FP,
1373                         0, sizeof(struct user_i387_ia32_struct), datap);
1374
1375         case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1376                 return copy_regset_to_user(child, &user_x86_32_view,
1377                                            REGSET_XFP, 0,
1378                                            sizeof(struct user32_fxsr_struct),
1379                                            datap);
1380
1381         case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1382                 return copy_regset_from_user(child, &user_x86_32_view,
1383                                              REGSET_XFP, 0,
1384                                              sizeof(struct user32_fxsr_struct),
1385                                              datap);
1386
1387         default:
1388                 return compat_ptrace_request(child, request, addr, data);
1389         }
1390
1391  out:
1392         put_task_struct(child);
1393         return ret;
1394 }
1395
1396 #endif  /* CONFIG_IA32_EMULATION */
1397
1398 #ifdef CONFIG_X86_64
1399
1400 static const struct user_regset x86_64_regsets[] = {
1401         [REGSET_GENERAL] = {
1402                 .core_note_type = NT_PRSTATUS,
1403                 .n = sizeof(struct user_regs_struct) / sizeof(long),
1404                 .size = sizeof(long), .align = sizeof(long),
1405                 .get = genregs_get, .set = genregs_set
1406         },
1407         [REGSET_FP] = {
1408                 .core_note_type = NT_PRFPREG,
1409                 .n = sizeof(struct user_i387_struct) / sizeof(long),
1410                 .size = sizeof(long), .align = sizeof(long),
1411                 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1412         },
1413 };
1414
1415 static const struct user_regset_view user_x86_64_view = {
1416         .name = "x86_64", .e_machine = EM_X86_64,
1417         .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1418 };
1419
1420 #else  /* CONFIG_X86_32 */
1421
1422 #define user_regs_struct32      user_regs_struct
1423 #define genregs32_get           genregs_get
1424 #define genregs32_set           genregs_set
1425
1426 #endif  /* CONFIG_X86_64 */
1427
1428 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1429 static const struct user_regset x86_32_regsets[] = {
1430         [REGSET_GENERAL] = {
1431                 .core_note_type = NT_PRSTATUS,
1432                 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1433                 .size = sizeof(u32), .align = sizeof(u32),
1434                 .get = genregs32_get, .set = genregs32_set
1435         },
1436         [REGSET_FP] = {
1437                 .core_note_type = NT_PRFPREG,
1438                 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1439                 .size = sizeof(u32), .align = sizeof(u32),
1440                 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1441         },
1442         [REGSET_XFP] = {
1443                 .core_note_type = NT_PRXFPREG,
1444                 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1445                 .size = sizeof(u32), .align = sizeof(u32),
1446                 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1447         },
1448         [REGSET_TLS] = {
1449                 .core_note_type = NT_386_TLS,
1450                 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1451                 .size = sizeof(struct user_desc),
1452                 .align = sizeof(struct user_desc),
1453                 .active = regset_tls_active,
1454                 .get = regset_tls_get, .set = regset_tls_set
1455         },
1456 };
1457
1458 static const struct user_regset_view user_x86_32_view = {
1459         .name = "i386", .e_machine = EM_386,
1460         .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1461 };
1462 #endif
1463
1464 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1465 {
1466 #ifdef CONFIG_IA32_EMULATION
1467         if (test_tsk_thread_flag(task, TIF_IA32))
1468 #endif
1469 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1470                 return &user_x86_32_view;
1471 #endif
1472 #ifdef CONFIG_X86_64
1473         return &user_x86_64_view;
1474 #endif
1475 }
1476
1477 #ifdef CONFIG_X86_32
1478
1479 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
1480 {
1481         struct siginfo info;
1482
1483         tsk->thread.trap_no = 1;
1484         tsk->thread.error_code = error_code;
1485
1486         memset(&info, 0, sizeof(info));
1487         info.si_signo = SIGTRAP;
1488         info.si_code = TRAP_BRKPT;
1489
1490         /* User-mode ip? */
1491         info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
1492
1493         /* Send us the fake SIGTRAP */
1494         force_sig_info(SIGTRAP, &info, tsk);
1495 }
1496
1497 /* notification of system call entry/exit
1498  * - triggered by current->work.syscall_trace
1499  */
1500 __attribute__((regparm(3)))
1501 int do_syscall_trace(struct pt_regs *regs, int entryexit)
1502 {
1503         int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU);
1504         /*
1505          * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall
1506          * interception
1507          */
1508         int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP);
1509         int ret = 0;
1510
1511         /* do the secure computing check first */
1512         if (!entryexit)
1513                 secure_computing(regs->orig_ax);
1514
1515         if (unlikely(current->audit_context)) {
1516                 if (entryexit)
1517                         audit_syscall_exit(AUDITSC_RESULT(regs->ax),
1518                                                 regs->ax);
1519                 /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only
1520                  * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is
1521                  * not used, entry.S will call us only on syscall exit, not
1522                  * entry; so when TIF_SYSCALL_AUDIT is used we must avoid
1523                  * calling send_sigtrap() on syscall entry.
1524                  *
1525                  * Note that when PTRACE_SYSEMU_SINGLESTEP is used,
1526                  * is_singlestep is false, despite his name, so we will still do
1527                  * the correct thing.
1528                  */
1529                 else if (is_singlestep)
1530                         goto out;
1531         }
1532
1533         if (!(current->ptrace & PT_PTRACED))
1534                 goto out;
1535
1536         /* If a process stops on the 1st tracepoint with SYSCALL_TRACE
1537          * and then is resumed with SYSEMU_SINGLESTEP, it will come in
1538          * here. We have to check this and return */
1539         if (is_sysemu && entryexit)
1540                 return 0;
1541
1542         /* Fake a debug trap */
1543         if (is_singlestep)
1544                 send_sigtrap(current, regs, 0);
1545
1546         if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu)
1547                 goto out;
1548
1549         /* the 0x80 provides a way for the tracing parent to distinguish
1550            between a syscall stop and SIGTRAP delivery */
1551         /* Note that the debugger could change the result of test_thread_flag!*/
1552         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0));
1553
1554         /*
1555          * this isn't the same as continuing with a signal, but it will do
1556          * for normal use.  strace only continues with a signal if the
1557          * stopping signal is not SIGTRAP.  -brl
1558          */
1559         if (current->exit_code) {
1560                 send_sig(current->exit_code, current, 1);
1561                 current->exit_code = 0;
1562         }
1563         ret = is_sysemu;
1564 out:
1565         if (unlikely(current->audit_context) && !entryexit)
1566                 audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax,
1567                                     regs->bx, regs->cx, regs->dx, regs->si);
1568         if (ret == 0)
1569                 return 0;
1570
1571         regs->orig_ax = -1; /* force skip of syscall restarting */
1572         if (unlikely(current->audit_context))
1573                 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1574         return 1;
1575 }
1576
1577 #else  /* CONFIG_X86_64 */
1578
1579 static void syscall_trace(struct pt_regs *regs)
1580 {
1581
1582 #if 0
1583         printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
1584                current->comm,
1585                regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
1586                current_thread_info()->flags, current->ptrace);
1587 #endif
1588
1589         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1590                                 ? 0x80 : 0));
1591         /*
1592          * this isn't the same as continuing with a signal, but it will do
1593          * for normal use.  strace only continues with a signal if the
1594          * stopping signal is not SIGTRAP.  -brl
1595          */
1596         if (current->exit_code) {
1597                 send_sig(current->exit_code, current, 1);
1598                 current->exit_code = 0;
1599         }
1600 }
1601
1602 asmlinkage void syscall_trace_enter(struct pt_regs *regs)
1603 {
1604         /* do the secure computing check first */
1605         secure_computing(regs->orig_ax);
1606
1607         if (test_thread_flag(TIF_SYSCALL_TRACE)
1608             && (current->ptrace & PT_PTRACED))
1609                 syscall_trace(regs);
1610
1611         if (unlikely(current->audit_context)) {
1612                 if (test_thread_flag(TIF_IA32)) {
1613                         audit_syscall_entry(AUDIT_ARCH_I386,
1614                                             regs->orig_ax,
1615                                             regs->bx, regs->cx,
1616                                             regs->dx, regs->si);
1617                 } else {
1618                         audit_syscall_entry(AUDIT_ARCH_X86_64,
1619                                             regs->orig_ax,
1620                                             regs->di, regs->si,
1621                                             regs->dx, regs->r10);
1622                 }
1623         }
1624 }
1625
1626 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1627 {
1628         if (unlikely(current->audit_context))
1629                 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1630
1631         if ((test_thread_flag(TIF_SYSCALL_TRACE)
1632              || test_thread_flag(TIF_SINGLESTEP))
1633             && (current->ptrace & PT_PTRACED))
1634                 syscall_trace(regs);
1635 }
1636
1637 #endif  /* CONFIG_X86_32 */