| 1 | /* |
| 2 | * arch/sh/kernel/ptrace_64.c |
| 3 | * |
| 4 | * Copyright (C) 2000, 2001 Paolo Alberelli |
| 5 | * Copyright (C) 2003 - 2008 Paul Mundt |
| 6 | * |
| 7 | * Started from SH3/4 version: |
| 8 | * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka |
| 9 | * |
| 10 | * Original x86 implementation: |
| 11 | * By Ross Biro 1/23/92 |
| 12 | * edited by Linus Torvalds |
| 13 | * |
| 14 | * This file is subject to the terms and conditions of the GNU General Public |
| 15 | * License. See the file "COPYING" in the main directory of this archive |
| 16 | * for more details. |
| 17 | */ |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/rwsem.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/sched/task_stack.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/smp.h> |
| 24 | #include <linux/bitops.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/ptrace.h> |
| 27 | #include <linux/user.h> |
| 28 | #include <linux/signal.h> |
| 29 | #include <linux/syscalls.h> |
| 30 | #include <linux/audit.h> |
| 31 | #include <linux/seccomp.h> |
| 32 | #include <linux/tracehook.h> |
| 33 | #include <linux/elf.h> |
| 34 | #include <linux/regset.h> |
| 35 | #include <asm/io.h> |
| 36 | #include <linux/uaccess.h> |
| 37 | #include <asm/pgtable.h> |
| 38 | #include <asm/processor.h> |
| 39 | #include <asm/mmu_context.h> |
| 40 | #include <asm/syscalls.h> |
| 41 | #include <asm/fpu.h> |
| 42 | #include <asm/traps.h> |
| 43 | |
| 44 | #define CREATE_TRACE_POINTS |
| 45 | #include <trace/events/syscalls.h> |
| 46 | |
| 47 | /* This mask defines the bits of the SR which the user is not allowed to |
| 48 | change, which are everything except S, Q, M, PR, SZ, FR. */ |
| 49 | #define SR_MASK (0xffff8cfd) |
| 50 | |
| 51 | /* |
| 52 | * does not yet catch signals sent when the child dies. |
| 53 | * in exit.c or in signal.c. |
| 54 | */ |
| 55 | |
| 56 | /* |
| 57 | * This routine will get a word from the user area in the process kernel stack. |
| 58 | */ |
| 59 | static inline int get_stack_long(struct task_struct *task, int offset) |
| 60 | { |
| 61 | unsigned char *stack; |
| 62 | |
| 63 | stack = (unsigned char *)(task->thread.uregs); |
| 64 | stack += offset; |
| 65 | return (*((int *)stack)); |
| 66 | } |
| 67 | |
| 68 | static inline unsigned long |
| 69 | get_fpu_long(struct task_struct *task, unsigned long addr) |
| 70 | { |
| 71 | unsigned long tmp; |
| 72 | struct pt_regs *regs; |
| 73 | regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1; |
| 74 | |
| 75 | if (!tsk_used_math(task)) { |
| 76 | if (addr == offsetof(struct user_fpu_struct, fpscr)) { |
| 77 | tmp = FPSCR_INIT; |
| 78 | } else { |
| 79 | tmp = 0xffffffffUL; /* matches initial value in fpu.c */ |
| 80 | } |
| 81 | return tmp; |
| 82 | } |
| 83 | |
| 84 | if (last_task_used_math == task) { |
| 85 | enable_fpu(); |
| 86 | save_fpu(task); |
| 87 | disable_fpu(); |
| 88 | last_task_used_math = 0; |
| 89 | regs->sr |= SR_FD; |
| 90 | } |
| 91 | |
| 92 | tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)]; |
| 93 | return tmp; |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * This routine will put a word into the user area in the process kernel stack. |
| 98 | */ |
| 99 | static inline int put_stack_long(struct task_struct *task, int offset, |
| 100 | unsigned long data) |
| 101 | { |
| 102 | unsigned char *stack; |
| 103 | |
| 104 | stack = (unsigned char *)(task->thread.uregs); |
| 105 | stack += offset; |
| 106 | *(unsigned long *) stack = data; |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static inline int |
| 111 | put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data) |
| 112 | { |
| 113 | struct pt_regs *regs; |
| 114 | |
| 115 | regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1; |
| 116 | |
| 117 | if (!tsk_used_math(task)) { |
| 118 | init_fpu(task); |
| 119 | } else if (last_task_used_math == task) { |
| 120 | enable_fpu(); |
| 121 | save_fpu(task); |
| 122 | disable_fpu(); |
| 123 | last_task_used_math = 0; |
| 124 | regs->sr |= SR_FD; |
| 125 | } |
| 126 | |
| 127 | ((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data; |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | void user_enable_single_step(struct task_struct *child) |
| 132 | { |
| 133 | struct pt_regs *regs = child->thread.uregs; |
| 134 | |
| 135 | regs->sr |= SR_SSTEP; /* auto-resetting upon exception */ |
| 136 | |
| 137 | set_tsk_thread_flag(child, TIF_SINGLESTEP); |
| 138 | } |
| 139 | |
| 140 | void user_disable_single_step(struct task_struct *child) |
| 141 | { |
| 142 | struct pt_regs *regs = child->thread.uregs; |
| 143 | |
| 144 | regs->sr &= ~SR_SSTEP; |
| 145 | |
| 146 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); |
| 147 | } |
| 148 | |
| 149 | static int genregs_get(struct task_struct *target, |
| 150 | const struct user_regset *regset, |
| 151 | unsigned int pos, unsigned int count, |
| 152 | void *kbuf, void __user *ubuf) |
| 153 | { |
| 154 | const struct pt_regs *regs = task_pt_regs(target); |
| 155 | int ret; |
| 156 | |
| 157 | /* PC, SR, SYSCALL */ |
| 158 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 159 | ®s->pc, |
| 160 | 0, 3 * sizeof(unsigned long long)); |
| 161 | |
| 162 | /* R1 -> R63 */ |
| 163 | if (!ret) |
| 164 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 165 | regs->regs, |
| 166 | offsetof(struct pt_regs, regs[0]), |
| 167 | 63 * sizeof(unsigned long long)); |
| 168 | /* TR0 -> TR7 */ |
| 169 | if (!ret) |
| 170 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 171 | regs->tregs, |
| 172 | offsetof(struct pt_regs, tregs[0]), |
| 173 | 8 * sizeof(unsigned long long)); |
| 174 | |
| 175 | if (!ret) |
| 176 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, |
| 177 | sizeof(struct pt_regs), -1); |
| 178 | |
| 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | static int genregs_set(struct task_struct *target, |
| 183 | const struct user_regset *regset, |
| 184 | unsigned int pos, unsigned int count, |
| 185 | const void *kbuf, const void __user *ubuf) |
| 186 | { |
| 187 | struct pt_regs *regs = task_pt_regs(target); |
| 188 | int ret; |
| 189 | |
| 190 | /* PC, SR, SYSCALL */ |
| 191 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 192 | ®s->pc, |
| 193 | 0, 3 * sizeof(unsigned long long)); |
| 194 | |
| 195 | /* R1 -> R63 */ |
| 196 | if (!ret && count > 0) |
| 197 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 198 | regs->regs, |
| 199 | offsetof(struct pt_regs, regs[0]), |
| 200 | 63 * sizeof(unsigned long long)); |
| 201 | |
| 202 | /* TR0 -> TR7 */ |
| 203 | if (!ret && count > 0) |
| 204 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 205 | regs->tregs, |
| 206 | offsetof(struct pt_regs, tregs[0]), |
| 207 | 8 * sizeof(unsigned long long)); |
| 208 | |
| 209 | if (!ret) |
| 210 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
| 211 | sizeof(struct pt_regs), -1); |
| 212 | |
| 213 | return ret; |
| 214 | } |
| 215 | |
| 216 | #ifdef CONFIG_SH_FPU |
| 217 | int fpregs_get(struct task_struct *target, |
| 218 | const struct user_regset *regset, |
| 219 | unsigned int pos, unsigned int count, |
| 220 | void *kbuf, void __user *ubuf) |
| 221 | { |
| 222 | int ret; |
| 223 | |
| 224 | ret = init_fpu(target); |
| 225 | if (ret) |
| 226 | return ret; |
| 227 | |
| 228 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 229 | &target->thread.xstate->hardfpu, 0, -1); |
| 230 | } |
| 231 | |
| 232 | static int fpregs_set(struct task_struct *target, |
| 233 | const struct user_regset *regset, |
| 234 | unsigned int pos, unsigned int count, |
| 235 | const void *kbuf, const void __user *ubuf) |
| 236 | { |
| 237 | int ret; |
| 238 | |
| 239 | ret = init_fpu(target); |
| 240 | if (ret) |
| 241 | return ret; |
| 242 | |
| 243 | set_stopped_child_used_math(target); |
| 244 | |
| 245 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 246 | &target->thread.xstate->hardfpu, 0, -1); |
| 247 | } |
| 248 | |
| 249 | static int fpregs_active(struct task_struct *target, |
| 250 | const struct user_regset *regset) |
| 251 | { |
| 252 | return tsk_used_math(target) ? regset->n : 0; |
| 253 | } |
| 254 | #endif |
| 255 | |
| 256 | const struct pt_regs_offset regoffset_table[] = { |
| 257 | REG_OFFSET_NAME(pc), |
| 258 | REG_OFFSET_NAME(sr), |
| 259 | REG_OFFSET_NAME(syscall_nr), |
| 260 | REGS_OFFSET_NAME(0), |
| 261 | REGS_OFFSET_NAME(1), |
| 262 | REGS_OFFSET_NAME(2), |
| 263 | REGS_OFFSET_NAME(3), |
| 264 | REGS_OFFSET_NAME(4), |
| 265 | REGS_OFFSET_NAME(5), |
| 266 | REGS_OFFSET_NAME(6), |
| 267 | REGS_OFFSET_NAME(7), |
| 268 | REGS_OFFSET_NAME(8), |
| 269 | REGS_OFFSET_NAME(9), |
| 270 | REGS_OFFSET_NAME(10), |
| 271 | REGS_OFFSET_NAME(11), |
| 272 | REGS_OFFSET_NAME(12), |
| 273 | REGS_OFFSET_NAME(13), |
| 274 | REGS_OFFSET_NAME(14), |
| 275 | REGS_OFFSET_NAME(15), |
| 276 | REGS_OFFSET_NAME(16), |
| 277 | REGS_OFFSET_NAME(17), |
| 278 | REGS_OFFSET_NAME(18), |
| 279 | REGS_OFFSET_NAME(19), |
| 280 | REGS_OFFSET_NAME(20), |
| 281 | REGS_OFFSET_NAME(21), |
| 282 | REGS_OFFSET_NAME(22), |
| 283 | REGS_OFFSET_NAME(23), |
| 284 | REGS_OFFSET_NAME(24), |
| 285 | REGS_OFFSET_NAME(25), |
| 286 | REGS_OFFSET_NAME(26), |
| 287 | REGS_OFFSET_NAME(27), |
| 288 | REGS_OFFSET_NAME(28), |
| 289 | REGS_OFFSET_NAME(29), |
| 290 | REGS_OFFSET_NAME(30), |
| 291 | REGS_OFFSET_NAME(31), |
| 292 | REGS_OFFSET_NAME(32), |
| 293 | REGS_OFFSET_NAME(33), |
| 294 | REGS_OFFSET_NAME(34), |
| 295 | REGS_OFFSET_NAME(35), |
| 296 | REGS_OFFSET_NAME(36), |
| 297 | REGS_OFFSET_NAME(37), |
| 298 | REGS_OFFSET_NAME(38), |
| 299 | REGS_OFFSET_NAME(39), |
| 300 | REGS_OFFSET_NAME(40), |
| 301 | REGS_OFFSET_NAME(41), |
| 302 | REGS_OFFSET_NAME(42), |
| 303 | REGS_OFFSET_NAME(43), |
| 304 | REGS_OFFSET_NAME(44), |
| 305 | REGS_OFFSET_NAME(45), |
| 306 | REGS_OFFSET_NAME(46), |
| 307 | REGS_OFFSET_NAME(47), |
| 308 | REGS_OFFSET_NAME(48), |
| 309 | REGS_OFFSET_NAME(49), |
| 310 | REGS_OFFSET_NAME(50), |
| 311 | REGS_OFFSET_NAME(51), |
| 312 | REGS_OFFSET_NAME(52), |
| 313 | REGS_OFFSET_NAME(53), |
| 314 | REGS_OFFSET_NAME(54), |
| 315 | REGS_OFFSET_NAME(55), |
| 316 | REGS_OFFSET_NAME(56), |
| 317 | REGS_OFFSET_NAME(57), |
| 318 | REGS_OFFSET_NAME(58), |
| 319 | REGS_OFFSET_NAME(59), |
| 320 | REGS_OFFSET_NAME(60), |
| 321 | REGS_OFFSET_NAME(61), |
| 322 | REGS_OFFSET_NAME(62), |
| 323 | REGS_OFFSET_NAME(63), |
| 324 | TREGS_OFFSET_NAME(0), |
| 325 | TREGS_OFFSET_NAME(1), |
| 326 | TREGS_OFFSET_NAME(2), |
| 327 | TREGS_OFFSET_NAME(3), |
| 328 | TREGS_OFFSET_NAME(4), |
| 329 | TREGS_OFFSET_NAME(5), |
| 330 | TREGS_OFFSET_NAME(6), |
| 331 | TREGS_OFFSET_NAME(7), |
| 332 | REG_OFFSET_END, |
| 333 | }; |
| 334 | |
| 335 | /* |
| 336 | * These are our native regset flavours. |
| 337 | */ |
| 338 | enum sh_regset { |
| 339 | REGSET_GENERAL, |
| 340 | #ifdef CONFIG_SH_FPU |
| 341 | REGSET_FPU, |
| 342 | #endif |
| 343 | }; |
| 344 | |
| 345 | static const struct user_regset sh_regsets[] = { |
| 346 | /* |
| 347 | * Format is: |
| 348 | * PC, SR, SYSCALL, |
| 349 | * R1 --> R63, |
| 350 | * TR0 --> TR7, |
| 351 | */ |
| 352 | [REGSET_GENERAL] = { |
| 353 | .core_note_type = NT_PRSTATUS, |
| 354 | .n = ELF_NGREG, |
| 355 | .size = sizeof(long long), |
| 356 | .align = sizeof(long long), |
| 357 | .get = genregs_get, |
| 358 | .set = genregs_set, |
| 359 | }, |
| 360 | |
| 361 | #ifdef CONFIG_SH_FPU |
| 362 | [REGSET_FPU] = { |
| 363 | .core_note_type = NT_PRFPREG, |
| 364 | .n = sizeof(struct user_fpu_struct) / |
| 365 | sizeof(long long), |
| 366 | .size = sizeof(long long), |
| 367 | .align = sizeof(long long), |
| 368 | .get = fpregs_get, |
| 369 | .set = fpregs_set, |
| 370 | .active = fpregs_active, |
| 371 | }, |
| 372 | #endif |
| 373 | }; |
| 374 | |
| 375 | static const struct user_regset_view user_sh64_native_view = { |
| 376 | .name = "sh64", |
| 377 | .e_machine = EM_SH, |
| 378 | .regsets = sh_regsets, |
| 379 | .n = ARRAY_SIZE(sh_regsets), |
| 380 | }; |
| 381 | |
| 382 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| 383 | { |
| 384 | return &user_sh64_native_view; |
| 385 | } |
| 386 | |
| 387 | long arch_ptrace(struct task_struct *child, long request, |
| 388 | unsigned long addr, unsigned long data) |
| 389 | { |
| 390 | int ret; |
| 391 | unsigned long __user *datap = (unsigned long __user *) data; |
| 392 | |
| 393 | switch (request) { |
| 394 | /* read the word at location addr in the USER area. */ |
| 395 | case PTRACE_PEEKUSR: { |
| 396 | unsigned long tmp; |
| 397 | |
| 398 | ret = -EIO; |
| 399 | if ((addr & 3) || addr < 0) |
| 400 | break; |
| 401 | |
| 402 | if (addr < sizeof(struct pt_regs)) |
| 403 | tmp = get_stack_long(child, addr); |
| 404 | else if ((addr >= offsetof(struct user, fpu)) && |
| 405 | (addr < offsetof(struct user, u_fpvalid))) { |
| 406 | unsigned long index; |
| 407 | ret = init_fpu(child); |
| 408 | if (ret) |
| 409 | break; |
| 410 | index = addr - offsetof(struct user, fpu); |
| 411 | tmp = get_fpu_long(child, index); |
| 412 | } else if (addr == offsetof(struct user, u_fpvalid)) { |
| 413 | tmp = !!tsk_used_math(child); |
| 414 | } else { |
| 415 | break; |
| 416 | } |
| 417 | ret = put_user(tmp, datap); |
| 418 | break; |
| 419 | } |
| 420 | |
| 421 | case PTRACE_POKEUSR: |
| 422 | /* write the word at location addr in the USER area. We must |
| 423 | disallow any changes to certain SR bits or u_fpvalid, since |
| 424 | this could crash the kernel or result in a security |
| 425 | loophole. */ |
| 426 | ret = -EIO; |
| 427 | if ((addr & 3) || addr < 0) |
| 428 | break; |
| 429 | |
| 430 | if (addr < sizeof(struct pt_regs)) { |
| 431 | /* Ignore change of top 32 bits of SR */ |
| 432 | if (addr == offsetof (struct pt_regs, sr)+4) |
| 433 | { |
| 434 | ret = 0; |
| 435 | break; |
| 436 | } |
| 437 | /* If lower 32 bits of SR, ignore non-user bits */ |
| 438 | if (addr == offsetof (struct pt_regs, sr)) |
| 439 | { |
| 440 | long cursr = get_stack_long(child, addr); |
| 441 | data &= ~(SR_MASK); |
| 442 | data |= (cursr & SR_MASK); |
| 443 | } |
| 444 | ret = put_stack_long(child, addr, data); |
| 445 | } |
| 446 | else if ((addr >= offsetof(struct user, fpu)) && |
| 447 | (addr < offsetof(struct user, u_fpvalid))) { |
| 448 | unsigned long index; |
| 449 | ret = init_fpu(child); |
| 450 | if (ret) |
| 451 | break; |
| 452 | index = addr - offsetof(struct user, fpu); |
| 453 | ret = put_fpu_long(child, index, data); |
| 454 | } |
| 455 | break; |
| 456 | |
| 457 | case PTRACE_GETREGS: |
| 458 | return copy_regset_to_user(child, &user_sh64_native_view, |
| 459 | REGSET_GENERAL, |
| 460 | 0, sizeof(struct pt_regs), |
| 461 | datap); |
| 462 | case PTRACE_SETREGS: |
| 463 | return copy_regset_from_user(child, &user_sh64_native_view, |
| 464 | REGSET_GENERAL, |
| 465 | 0, sizeof(struct pt_regs), |
| 466 | datap); |
| 467 | #ifdef CONFIG_SH_FPU |
| 468 | case PTRACE_GETFPREGS: |
| 469 | return copy_regset_to_user(child, &user_sh64_native_view, |
| 470 | REGSET_FPU, |
| 471 | 0, sizeof(struct user_fpu_struct), |
| 472 | datap); |
| 473 | case PTRACE_SETFPREGS: |
| 474 | return copy_regset_from_user(child, &user_sh64_native_view, |
| 475 | REGSET_FPU, |
| 476 | 0, sizeof(struct user_fpu_struct), |
| 477 | datap); |
| 478 | #endif |
| 479 | default: |
| 480 | ret = ptrace_request(child, request, addr, data); |
| 481 | break; |
| 482 | } |
| 483 | |
| 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | asmlinkage int sh64_ptrace(long request, long pid, |
| 488 | unsigned long addr, unsigned long data) |
| 489 | { |
| 490 | #define WPC_DBRMODE 0x0d104008 |
| 491 | static unsigned long first_call; |
| 492 | |
| 493 | if (!test_and_set_bit(0, &first_call)) { |
| 494 | /* Set WPC.DBRMODE to 0. This makes all debug events get |
| 495 | * delivered through RESVEC, i.e. into the handlers in entry.S. |
| 496 | * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE |
| 497 | * would normally be left set to 1, which makes debug events get |
| 498 | * delivered through DBRVEC, i.e. into the remote gdb's |
| 499 | * handlers. This prevents ptrace getting them, and confuses |
| 500 | * the remote gdb.) */ |
| 501 | printk("DBRMODE set to 0 to permit native debugging\n"); |
| 502 | poke_real_address_q(WPC_DBRMODE, 0); |
| 503 | } |
| 504 | |
| 505 | return sys_ptrace(request, pid, addr, data); |
| 506 | } |
| 507 | |
| 508 | asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs) |
| 509 | { |
| 510 | long long ret = 0; |
| 511 | |
| 512 | secure_computing_strict(regs->regs[9]); |
| 513 | |
| 514 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
| 515 | tracehook_report_syscall_entry(regs)) |
| 516 | /* |
| 517 | * Tracing decided this syscall should not happen. |
| 518 | * We'll return a bogus call number to get an ENOSYS |
| 519 | * error, but leave the original number in regs->regs[0]. |
| 520 | */ |
| 521 | ret = -1LL; |
| 522 | |
| 523 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| 524 | trace_sys_enter(regs, regs->regs[9]); |
| 525 | |
| 526 | audit_syscall_entry(regs->regs[1], regs->regs[2], regs->regs[3], |
| 527 | regs->regs[4], regs->regs[5]); |
| 528 | |
| 529 | return ret ?: regs->regs[9]; |
| 530 | } |
| 531 | |
| 532 | asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) |
| 533 | { |
| 534 | int step; |
| 535 | |
| 536 | audit_syscall_exit(regs); |
| 537 | |
| 538 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| 539 | trace_sys_exit(regs, regs->regs[9]); |
| 540 | |
| 541 | step = test_thread_flag(TIF_SINGLESTEP); |
| 542 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) |
| 543 | tracehook_report_syscall_exit(regs, step); |
| 544 | } |
| 545 | |
| 546 | /* Called with interrupts disabled */ |
| 547 | asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs) |
| 548 | { |
| 549 | /* This is called after a single step exception (DEBUGSS). |
| 550 | There is no need to change the PC, as it is a post-execution |
| 551 | exception, as entry.S does not do anything to the PC for DEBUGSS. |
| 552 | We need to clear the Single Step setting in SR to avoid |
| 553 | continually stepping. */ |
| 554 | local_irq_enable(); |
| 555 | regs->sr &= ~SR_SSTEP; |
| 556 | force_sig(SIGTRAP, current); |
| 557 | } |
| 558 | |
| 559 | /* Called with interrupts disabled */ |
| 560 | BUILD_TRAP_HANDLER(breakpoint) |
| 561 | { |
| 562 | TRAP_HANDLER_DECL; |
| 563 | |
| 564 | /* We need to forward step the PC, to counteract the backstep done |
| 565 | in signal.c. */ |
| 566 | local_irq_enable(); |
| 567 | force_sig(SIGTRAP, current); |
| 568 | regs->pc += 4; |
| 569 | } |
| 570 | |
| 571 | /* |
| 572 | * Called by kernel/ptrace.c when detaching.. |
| 573 | * |
| 574 | * Make sure single step bits etc are not set. |
| 575 | */ |
| 576 | void ptrace_disable(struct task_struct *child) |
| 577 | { |
| 578 | user_disable_single_step(child); |
| 579 | } |