ptrace.c revision 8130b9d7b9d858aa04ce67805e8951e3cb6e9b2f
1/* 2 * linux/arch/arm/kernel/ptrace.c 3 * 4 * By Ross Biro 1/23/92 5 * edited by Linus Torvalds 6 * ARM modifications Copyright (C) 2000 Russell King 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12#include <linux/kernel.h> 13#include <linux/sched.h> 14#include <linux/mm.h> 15#include <linux/elf.h> 16#include <linux/smp.h> 17#include <linux/ptrace.h> 18#include <linux/user.h> 19#include <linux/security.h> 20#include <linux/init.h> 21#include <linux/signal.h> 22#include <linux/uaccess.h> 23#include <linux/perf_event.h> 24#include <linux/hw_breakpoint.h> 25#include <linux/regset.h> 26 27#include <asm/pgtable.h> 28#include <asm/system.h> 29#include <asm/traps.h> 30 31#define REG_PC 15 32#define REG_PSR 16 33/* 34 * does not yet catch signals sent when the child dies. 35 * in exit.c or in signal.c. 36 */ 37 38#if 0 39/* 40 * Breakpoint SWI instruction: SWI &9F0001 41 */ 42#define BREAKINST_ARM 0xef9f0001 43#define BREAKINST_THUMB 0xdf00 /* fill this in later */ 44#else 45/* 46 * New breakpoints - use an undefined instruction. The ARM architecture 47 * reference manual guarantees that the following instruction space 48 * will produce an undefined instruction exception on all CPUs: 49 * 50 * ARM: xxxx 0111 1111 xxxx xxxx xxxx 1111 xxxx 51 * Thumb: 1101 1110 xxxx xxxx 52 */ 53#define BREAKINST_ARM 0xe7f001f0 54#define BREAKINST_THUMB 0xde01 55#endif 56 57struct pt_regs_offset { 58 const char *name; 59 int offset; 60}; 61 62#define REG_OFFSET_NAME(r) \ 63 {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)} 64#define REG_OFFSET_END {.name = NULL, .offset = 0} 65 66static const struct pt_regs_offset regoffset_table[] = { 67 REG_OFFSET_NAME(r0), 68 REG_OFFSET_NAME(r1), 69 REG_OFFSET_NAME(r2), 70 REG_OFFSET_NAME(r3), 71 REG_OFFSET_NAME(r4), 72 REG_OFFSET_NAME(r5), 73 REG_OFFSET_NAME(r6), 74 REG_OFFSET_NAME(r7), 75 REG_OFFSET_NAME(r8), 76 REG_OFFSET_NAME(r9), 77 REG_OFFSET_NAME(r10), 78 REG_OFFSET_NAME(fp), 79 REG_OFFSET_NAME(ip), 80 REG_OFFSET_NAME(sp), 81 REG_OFFSET_NAME(lr), 82 REG_OFFSET_NAME(pc), 83 REG_OFFSET_NAME(cpsr), 84 REG_OFFSET_NAME(ORIG_r0), 85 REG_OFFSET_END, 86}; 87 88/** 89 * regs_query_register_offset() - query register offset from its name 90 * @name: the name of a register 91 * 92 * regs_query_register_offset() returns the offset of a register in struct 93 * pt_regs from its name. If the name is invalid, this returns -EINVAL; 94 */ 95int regs_query_register_offset(const char *name) 96{ 97 const struct pt_regs_offset *roff; 98 for (roff = regoffset_table; roff->name != NULL; roff++) 99 if (!strcmp(roff->name, name)) 100 return roff->offset; 101 return -EINVAL; 102} 103 104/** 105 * regs_query_register_name() - query register name from its offset 106 * @offset: the offset of a register in struct pt_regs. 107 * 108 * regs_query_register_name() returns the name of a register from its 109 * offset in struct pt_regs. If the @offset is invalid, this returns NULL; 110 */ 111const char *regs_query_register_name(unsigned int offset) 112{ 113 const struct pt_regs_offset *roff; 114 for (roff = regoffset_table; roff->name != NULL; roff++) 115 if (roff->offset == offset) 116 return roff->name; 117 return NULL; 118} 119 120/** 121 * regs_within_kernel_stack() - check the address in the stack 122 * @regs: pt_regs which contains kernel stack pointer. 123 * @addr: address which is checked. 124 * 125 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). 126 * If @addr is within the kernel stack, it returns true. If not, returns false. 127 */ 128bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) 129{ 130 return ((addr & ~(THREAD_SIZE - 1)) == 131 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); 132} 133 134/** 135 * regs_get_kernel_stack_nth() - get Nth entry of the stack 136 * @regs: pt_regs which contains kernel stack pointer. 137 * @n: stack entry number. 138 * 139 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which 140 * is specified by @regs. If the @n th entry is NOT in the kernel stack, 141 * this returns 0. 142 */ 143unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) 144{ 145 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); 146 addr += n; 147 if (regs_within_kernel_stack(regs, (unsigned long)addr)) 148 return *addr; 149 else 150 return 0; 151} 152 153/* 154 * this routine will get a word off of the processes privileged stack. 155 * the offset is how far from the base addr as stored in the THREAD. 156 * this routine assumes that all the privileged stacks are in our 157 * data space. 158 */ 159static inline long get_user_reg(struct task_struct *task, int offset) 160{ 161 return task_pt_regs(task)->uregs[offset]; 162} 163 164/* 165 * this routine will put a word on the processes privileged stack. 166 * the offset is how far from the base addr as stored in the THREAD. 167 * this routine assumes that all the privileged stacks are in our 168 * data space. 169 */ 170static inline int 171put_user_reg(struct task_struct *task, int offset, long data) 172{ 173 struct pt_regs newregs, *regs = task_pt_regs(task); 174 int ret = -EINVAL; 175 176 newregs = *regs; 177 newregs.uregs[offset] = data; 178 179 if (valid_user_regs(&newregs)) { 180 regs->uregs[offset] = data; 181 ret = 0; 182 } 183 184 return ret; 185} 186 187/* 188 * Called by kernel/ptrace.c when detaching.. 189 */ 190void ptrace_disable(struct task_struct *child) 191{ 192 /* Nothing to do. */ 193} 194 195/* 196 * Handle hitting a breakpoint. 197 */ 198void ptrace_break(struct task_struct *tsk, struct pt_regs *regs) 199{ 200 siginfo_t info; 201 202 info.si_signo = SIGTRAP; 203 info.si_errno = 0; 204 info.si_code = TRAP_BRKPT; 205 info.si_addr = (void __user *)instruction_pointer(regs); 206 207 force_sig_info(SIGTRAP, &info, tsk); 208} 209 210static int break_trap(struct pt_regs *regs, unsigned int instr) 211{ 212 ptrace_break(current, regs); 213 return 0; 214} 215 216static struct undef_hook arm_break_hook = { 217 .instr_mask = 0x0fffffff, 218 .instr_val = 0x07f001f0, 219 .cpsr_mask = PSR_T_BIT, 220 .cpsr_val = 0, 221 .fn = break_trap, 222}; 223 224static struct undef_hook thumb_break_hook = { 225 .instr_mask = 0xffff, 226 .instr_val = 0xde01, 227 .cpsr_mask = PSR_T_BIT, 228 .cpsr_val = PSR_T_BIT, 229 .fn = break_trap, 230}; 231 232static struct undef_hook thumb2_break_hook = { 233 .instr_mask = 0xffffffff, 234 .instr_val = 0xf7f0a000, 235 .cpsr_mask = PSR_T_BIT, 236 .cpsr_val = PSR_T_BIT, 237 .fn = break_trap, 238}; 239 240static int __init ptrace_break_init(void) 241{ 242 register_undef_hook(&arm_break_hook); 243 register_undef_hook(&thumb_break_hook); 244 register_undef_hook(&thumb2_break_hook); 245 return 0; 246} 247 248core_initcall(ptrace_break_init); 249 250/* 251 * Read the word at offset "off" into the "struct user". We 252 * actually access the pt_regs stored on the kernel stack. 253 */ 254static int ptrace_read_user(struct task_struct *tsk, unsigned long off, 255 unsigned long __user *ret) 256{ 257 unsigned long tmp; 258 259 if (off & 3 || off >= sizeof(struct user)) 260 return -EIO; 261 262 tmp = 0; 263 if (off == PT_TEXT_ADDR) 264 tmp = tsk->mm->start_code; 265 else if (off == PT_DATA_ADDR) 266 tmp = tsk->mm->start_data; 267 else if (off == PT_TEXT_END_ADDR) 268 tmp = tsk->mm->end_code; 269 else if (off < sizeof(struct pt_regs)) 270 tmp = get_user_reg(tsk, off >> 2); 271 272 return put_user(tmp, ret); 273} 274 275/* 276 * Write the word at offset "off" into "struct user". We 277 * actually access the pt_regs stored on the kernel stack. 278 */ 279static int ptrace_write_user(struct task_struct *tsk, unsigned long off, 280 unsigned long val) 281{ 282 if (off & 3 || off >= sizeof(struct user)) 283 return -EIO; 284 285 if (off >= sizeof(struct pt_regs)) 286 return 0; 287 288 return put_user_reg(tsk, off >> 2, val); 289} 290 291#ifdef CONFIG_IWMMXT 292 293/* 294 * Get the child iWMMXt state. 295 */ 296static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp) 297{ 298 struct thread_info *thread = task_thread_info(tsk); 299 300 if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) 301 return -ENODATA; 302 iwmmxt_task_disable(thread); /* force it to ram */ 303 return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE) 304 ? -EFAULT : 0; 305} 306 307/* 308 * Set the child iWMMXt state. 309 */ 310static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp) 311{ 312 struct thread_info *thread = task_thread_info(tsk); 313 314 if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) 315 return -EACCES; 316 iwmmxt_task_release(thread); /* force a reload */ 317 return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE) 318 ? -EFAULT : 0; 319} 320 321#endif 322 323#ifdef CONFIG_CRUNCH 324/* 325 * Get the child Crunch state. 326 */ 327static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp) 328{ 329 struct thread_info *thread = task_thread_info(tsk); 330 331 crunch_task_disable(thread); /* force it to ram */ 332 return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE) 333 ? -EFAULT : 0; 334} 335 336/* 337 * Set the child Crunch state. 338 */ 339static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp) 340{ 341 struct thread_info *thread = task_thread_info(tsk); 342 343 crunch_task_release(thread); /* force a reload */ 344 return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE) 345 ? -EFAULT : 0; 346} 347#endif 348 349#ifdef CONFIG_HAVE_HW_BREAKPOINT 350/* 351 * Convert a virtual register number into an index for a thread_info 352 * breakpoint array. Breakpoints are identified using positive numbers 353 * whilst watchpoints are negative. The registers are laid out as pairs 354 * of (address, control), each pair mapping to a unique hw_breakpoint struct. 355 * Register 0 is reserved for describing resource information. 356 */ 357static int ptrace_hbp_num_to_idx(long num) 358{ 359 if (num < 0) 360 num = (ARM_MAX_BRP << 1) - num; 361 return (num - 1) >> 1; 362} 363 364/* 365 * Returns the virtual register number for the address of the 366 * breakpoint at index idx. 367 */ 368static long ptrace_hbp_idx_to_num(int idx) 369{ 370 long mid = ARM_MAX_BRP << 1; 371 long num = (idx << 1) + 1; 372 return num > mid ? mid - num : num; 373} 374 375/* 376 * Handle hitting a HW-breakpoint. 377 */ 378static void ptrace_hbptriggered(struct perf_event *bp, 379 struct perf_sample_data *data, 380 struct pt_regs *regs) 381{ 382 struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); 383 long num; 384 int i; 385 siginfo_t info; 386 387 for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i) 388 if (current->thread.debug.hbp[i] == bp) 389 break; 390 391 num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i); 392 393 info.si_signo = SIGTRAP; 394 info.si_errno = (int)num; 395 info.si_code = TRAP_HWBKPT; 396 info.si_addr = (void __user *)(bkpt->trigger); 397 398 force_sig_info(SIGTRAP, &info, current); 399} 400 401/* 402 * Set ptrace breakpoint pointers to zero for this task. 403 * This is required in order to prevent child processes from unregistering 404 * breakpoints held by their parent. 405 */ 406void clear_ptrace_hw_breakpoint(struct task_struct *tsk) 407{ 408 memset(tsk->thread.debug.hbp, 0, sizeof(tsk->thread.debug.hbp)); 409} 410 411/* 412 * Unregister breakpoints from this task and reset the pointers in 413 * the thread_struct. 414 */ 415void flush_ptrace_hw_breakpoint(struct task_struct *tsk) 416{ 417 int i; 418 struct thread_struct *t = &tsk->thread; 419 420 for (i = 0; i < ARM_MAX_HBP_SLOTS; i++) { 421 if (t->debug.hbp[i]) { 422 unregister_hw_breakpoint(t->debug.hbp[i]); 423 t->debug.hbp[i] = NULL; 424 } 425 } 426} 427 428static u32 ptrace_get_hbp_resource_info(void) 429{ 430 u8 num_brps, num_wrps, debug_arch, wp_len; 431 u32 reg = 0; 432 433 num_brps = hw_breakpoint_slots(TYPE_INST); 434 num_wrps = hw_breakpoint_slots(TYPE_DATA); 435 debug_arch = arch_get_debug_arch(); 436 wp_len = arch_get_max_wp_len(); 437 438 reg |= debug_arch; 439 reg <<= 8; 440 reg |= wp_len; 441 reg <<= 8; 442 reg |= num_wrps; 443 reg <<= 8; 444 reg |= num_brps; 445 446 return reg; 447} 448 449static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type) 450{ 451 struct perf_event_attr attr; 452 453 ptrace_breakpoint_init(&attr); 454 455 /* Initialise fields to sane defaults. */ 456 attr.bp_addr = 0; 457 attr.bp_len = HW_BREAKPOINT_LEN_4; 458 attr.bp_type = type; 459 attr.disabled = 1; 460 461 return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, 462 tsk); 463} 464 465static int ptrace_gethbpregs(struct task_struct *tsk, long num, 466 unsigned long __user *data) 467{ 468 u32 reg; 469 int idx, ret = 0; 470 struct perf_event *bp; 471 struct arch_hw_breakpoint_ctrl arch_ctrl; 472 473 if (num == 0) { 474 reg = ptrace_get_hbp_resource_info(); 475 } else { 476 idx = ptrace_hbp_num_to_idx(num); 477 if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { 478 ret = -EINVAL; 479 goto out; 480 } 481 482 bp = tsk->thread.debug.hbp[idx]; 483 if (!bp) { 484 reg = 0; 485 goto put; 486 } 487 488 arch_ctrl = counter_arch_bp(bp)->ctrl; 489 490 /* 491 * Fix up the len because we may have adjusted it 492 * to compensate for an unaligned address. 493 */ 494 while (!(arch_ctrl.len & 0x1)) 495 arch_ctrl.len >>= 1; 496 497 if (num & 0x1) 498 reg = bp->attr.bp_addr; 499 else 500 reg = encode_ctrl_reg(arch_ctrl); 501 } 502 503put: 504 if (put_user(reg, data)) 505 ret = -EFAULT; 506 507out: 508 return ret; 509} 510 511static int ptrace_sethbpregs(struct task_struct *tsk, long num, 512 unsigned long __user *data) 513{ 514 int idx, gen_len, gen_type, implied_type, ret = 0; 515 u32 user_val; 516 struct perf_event *bp; 517 struct arch_hw_breakpoint_ctrl ctrl; 518 struct perf_event_attr attr; 519 520 if (num == 0) 521 goto out; 522 else if (num < 0) 523 implied_type = HW_BREAKPOINT_RW; 524 else 525 implied_type = HW_BREAKPOINT_X; 526 527 idx = ptrace_hbp_num_to_idx(num); 528 if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { 529 ret = -EINVAL; 530 goto out; 531 } 532 533 if (get_user(user_val, data)) { 534 ret = -EFAULT; 535 goto out; 536 } 537 538 bp = tsk->thread.debug.hbp[idx]; 539 if (!bp) { 540 bp = ptrace_hbp_create(tsk, implied_type); 541 if (IS_ERR(bp)) { 542 ret = PTR_ERR(bp); 543 goto out; 544 } 545 tsk->thread.debug.hbp[idx] = bp; 546 } 547 548 attr = bp->attr; 549 550 if (num & 0x1) { 551 /* Address */ 552 attr.bp_addr = user_val; 553 } else { 554 /* Control */ 555 decode_ctrl_reg(user_val, &ctrl); 556 ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type); 557 if (ret) 558 goto out; 559 560 if ((gen_type & implied_type) != gen_type) { 561 ret = -EINVAL; 562 goto out; 563 } 564 565 attr.bp_len = gen_len; 566 attr.bp_type = gen_type; 567 attr.disabled = !ctrl.enabled; 568 } 569 570 ret = modify_user_hw_breakpoint(bp, &attr); 571out: 572 return ret; 573} 574#endif 575 576/* regset get/set implementations */ 577 578static int gpr_get(struct task_struct *target, 579 const struct user_regset *regset, 580 unsigned int pos, unsigned int count, 581 void *kbuf, void __user *ubuf) 582{ 583 struct pt_regs *regs = task_pt_regs(target); 584 585 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, 586 regs, 587 0, sizeof(*regs)); 588} 589 590static int gpr_set(struct task_struct *target, 591 const struct user_regset *regset, 592 unsigned int pos, unsigned int count, 593 const void *kbuf, const void __user *ubuf) 594{ 595 int ret; 596 struct pt_regs newregs; 597 598 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 599 &newregs, 600 0, sizeof(newregs)); 601 if (ret) 602 return ret; 603 604 if (!valid_user_regs(&newregs)) 605 return -EINVAL; 606 607 *task_pt_regs(target) = newregs; 608 return 0; 609} 610 611static int fpa_get(struct task_struct *target, 612 const struct user_regset *regset, 613 unsigned int pos, unsigned int count, 614 void *kbuf, void __user *ubuf) 615{ 616 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, 617 &task_thread_info(target)->fpstate, 618 0, sizeof(struct user_fp)); 619} 620 621static int fpa_set(struct task_struct *target, 622 const struct user_regset *regset, 623 unsigned int pos, unsigned int count, 624 const void *kbuf, const void __user *ubuf) 625{ 626 struct thread_info *thread = task_thread_info(target); 627 628 thread->used_cp[1] = thread->used_cp[2] = 1; 629 630 return user_regset_copyin(&pos, &count, &kbuf, &ubuf, 631 &thread->fpstate, 632 0, sizeof(struct user_fp)); 633} 634 635#ifdef CONFIG_VFP 636/* 637 * VFP register get/set implementations. 638 * 639 * With respect to the kernel, struct user_fp is divided into three chunks: 640 * 16 or 32 real VFP registers (d0-d15 or d0-31) 641 * These are transferred to/from the real registers in the task's 642 * vfp_hard_struct. The number of registers depends on the kernel 643 * configuration. 644 * 645 * 16 or 0 fake VFP registers (d16-d31 or empty) 646 * i.e., the user_vfp structure has space for 32 registers even if 647 * the kernel doesn't have them all. 648 * 649 * vfp_get() reads this chunk as zero where applicable 650 * vfp_set() ignores this chunk 651 * 652 * 1 word for the FPSCR 653 * 654 * The bounds-checking logic built into user_regset_copyout and friends 655 * means that we can make a simple sequence of calls to map the relevant data 656 * to/from the specified slice of the user regset structure. 657 */ 658static int vfp_get(struct task_struct *target, 659 const struct user_regset *regset, 660 unsigned int pos, unsigned int count, 661 void *kbuf, void __user *ubuf) 662{ 663 int ret; 664 struct thread_info *thread = task_thread_info(target); 665 struct vfp_hard_struct const *vfp = &thread->vfpstate.hard; 666 const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); 667 const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); 668 669 vfp_sync_hwstate(thread); 670 671 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, 672 &vfp->fpregs, 673 user_fpregs_offset, 674 user_fpregs_offset + sizeof(vfp->fpregs)); 675 if (ret) 676 return ret; 677 678 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 679 user_fpregs_offset + sizeof(vfp->fpregs), 680 user_fpscr_offset); 681 if (ret) 682 return ret; 683 684 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, 685 &vfp->fpscr, 686 user_fpscr_offset, 687 user_fpscr_offset + sizeof(vfp->fpscr)); 688} 689 690/* 691 * For vfp_set() a read-modify-write is done on the VFP registers, 692 * in order to avoid writing back a half-modified set of registers on 693 * failure. 694 */ 695static int vfp_set(struct task_struct *target, 696 const struct user_regset *regset, 697 unsigned int pos, unsigned int count, 698 const void *kbuf, const void __user *ubuf) 699{ 700 int ret; 701 struct thread_info *thread = task_thread_info(target); 702 struct vfp_hard_struct new_vfp; 703 const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); 704 const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); 705 706 vfp_sync_hwstate(thread); 707 new_vfp = thread->vfpstate.hard; 708 709 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 710 &new_vfp.fpregs, 711 user_fpregs_offset, 712 user_fpregs_offset + sizeof(new_vfp.fpregs)); 713 if (ret) 714 return ret; 715 716 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 717 user_fpregs_offset + sizeof(new_vfp.fpregs), 718 user_fpscr_offset); 719 if (ret) 720 return ret; 721 722 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 723 &new_vfp.fpscr, 724 user_fpscr_offset, 725 user_fpscr_offset + sizeof(new_vfp.fpscr)); 726 if (ret) 727 return ret; 728 729 vfp_flush_hwstate(thread); 730 thread->vfpstate.hard = new_vfp; 731 732 return 0; 733} 734#endif /* CONFIG_VFP */ 735 736enum arm_regset { 737 REGSET_GPR, 738 REGSET_FPR, 739#ifdef CONFIG_VFP 740 REGSET_VFP, 741#endif 742}; 743 744static const struct user_regset arm_regsets[] = { 745 [REGSET_GPR] = { 746 .core_note_type = NT_PRSTATUS, 747 .n = ELF_NGREG, 748 .size = sizeof(u32), 749 .align = sizeof(u32), 750 .get = gpr_get, 751 .set = gpr_set 752 }, 753 [REGSET_FPR] = { 754 /* 755 * For the FPA regs in fpstate, the real fields are a mixture 756 * of sizes, so pretend that the registers are word-sized: 757 */ 758 .core_note_type = NT_PRFPREG, 759 .n = sizeof(struct user_fp) / sizeof(u32), 760 .size = sizeof(u32), 761 .align = sizeof(u32), 762 .get = fpa_get, 763 .set = fpa_set 764 }, 765#ifdef CONFIG_VFP 766 [REGSET_VFP] = { 767 /* 768 * Pretend that the VFP regs are word-sized, since the FPSCR is 769 * a single word dangling at the end of struct user_vfp: 770 */ 771 .core_note_type = NT_ARM_VFP, 772 .n = ARM_VFPREGS_SIZE / sizeof(u32), 773 .size = sizeof(u32), 774 .align = sizeof(u32), 775 .get = vfp_get, 776 .set = vfp_set 777 }, 778#endif /* CONFIG_VFP */ 779}; 780 781static const struct user_regset_view user_arm_view = { 782 .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, 783 .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets) 784}; 785 786const struct user_regset_view *task_user_regset_view(struct task_struct *task) 787{ 788 return &user_arm_view; 789} 790 791long arch_ptrace(struct task_struct *child, long request, 792 unsigned long addr, unsigned long data) 793{ 794 int ret; 795 unsigned long __user *datap = (unsigned long __user *) data; 796 797 switch (request) { 798 case PTRACE_PEEKUSR: 799 ret = ptrace_read_user(child, addr, datap); 800 break; 801 802 case PTRACE_POKEUSR: 803 ret = ptrace_write_user(child, addr, data); 804 break; 805 806 case PTRACE_GETREGS: 807 ret = copy_regset_to_user(child, 808 &user_arm_view, REGSET_GPR, 809 0, sizeof(struct pt_regs), 810 datap); 811 break; 812 813 case PTRACE_SETREGS: 814 ret = copy_regset_from_user(child, 815 &user_arm_view, REGSET_GPR, 816 0, sizeof(struct pt_regs), 817 datap); 818 break; 819 820 case PTRACE_GETFPREGS: 821 ret = copy_regset_to_user(child, 822 &user_arm_view, REGSET_FPR, 823 0, sizeof(union fp_state), 824 datap); 825 break; 826 827 case PTRACE_SETFPREGS: 828 ret = copy_regset_from_user(child, 829 &user_arm_view, REGSET_FPR, 830 0, sizeof(union fp_state), 831 datap); 832 break; 833 834#ifdef CONFIG_IWMMXT 835 case PTRACE_GETWMMXREGS: 836 ret = ptrace_getwmmxregs(child, datap); 837 break; 838 839 case PTRACE_SETWMMXREGS: 840 ret = ptrace_setwmmxregs(child, datap); 841 break; 842#endif 843 844 case PTRACE_GET_THREAD_AREA: 845 ret = put_user(task_thread_info(child)->tp_value, 846 datap); 847 break; 848 849 case PTRACE_SET_SYSCALL: 850 task_thread_info(child)->syscall = data; 851 ret = 0; 852 break; 853 854#ifdef CONFIG_CRUNCH 855 case PTRACE_GETCRUNCHREGS: 856 ret = ptrace_getcrunchregs(child, datap); 857 break; 858 859 case PTRACE_SETCRUNCHREGS: 860 ret = ptrace_setcrunchregs(child, datap); 861 break; 862#endif 863 864#ifdef CONFIG_VFP 865 case PTRACE_GETVFPREGS: 866 ret = copy_regset_to_user(child, 867 &user_arm_view, REGSET_VFP, 868 0, ARM_VFPREGS_SIZE, 869 datap); 870 break; 871 872 case PTRACE_SETVFPREGS: 873 ret = copy_regset_from_user(child, 874 &user_arm_view, REGSET_VFP, 875 0, ARM_VFPREGS_SIZE, 876 datap); 877 break; 878#endif 879 880#ifdef CONFIG_HAVE_HW_BREAKPOINT 881 case PTRACE_GETHBPREGS: 882 if (ptrace_get_breakpoints(child) < 0) 883 return -ESRCH; 884 885 ret = ptrace_gethbpregs(child, addr, 886 (unsigned long __user *)data); 887 ptrace_put_breakpoints(child); 888 break; 889 case PTRACE_SETHBPREGS: 890 if (ptrace_get_breakpoints(child) < 0) 891 return -ESRCH; 892 893 ret = ptrace_sethbpregs(child, addr, 894 (unsigned long __user *)data); 895 ptrace_put_breakpoints(child); 896 break; 897#endif 898 899 default: 900 ret = ptrace_request(child, request, addr, data); 901 break; 902 } 903 904 return ret; 905} 906 907asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno) 908{ 909 unsigned long ip; 910 911 /* 912 * Save IP. IP is used to denote syscall entry/exit: 913 * IP = 0 -> entry, = 1 -> exit 914 */ 915 ip = regs->ARM_ip; 916 regs->ARM_ip = why; 917 918 if (!ip) 919 audit_syscall_exit(regs); 920 else 921 audit_syscall_entry(AUDIT_ARCH_ARMEB, scno, regs->ARM_r0, 922 regs->ARM_r1, regs->ARM_r2, regs->ARM_r3); 923 924 if (!test_thread_flag(TIF_SYSCALL_TRACE)) 925 return scno; 926 if (!(current->ptrace & PT_PTRACED)) 927 return scno; 928 929 current_thread_info()->syscall = scno; 930 931 /* the 0x80 provides a way for the tracing parent to distinguish 932 between a syscall stop and SIGTRAP delivery */ 933 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) 934 ? 0x80 : 0)); 935 /* 936 * this isn't the same as continuing with a signal, but it will do 937 * for normal use. strace only continues with a signal if the 938 * stopping signal is not SIGTRAP. -brl 939 */ 940 if (current->exit_code) { 941 send_sig(current->exit_code, current, 1); 942 current->exit_code = 0; 943 } 944 regs->ARM_ip = ip; 945 946 return current_thread_info()->syscall; 947} 948