Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Paul Mundt | 4b27c47 | 2007-11-28 19:58:11 +0900 | [diff] [blame] | 2 | * arch/sh/kernel/ptrace_64.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2000, 2001 Paolo Alberelli |
Paul Mundt | dd76279 | 2008-12-10 20:14:15 +0900 | [diff] [blame] | 5 | * Copyright (C) 2003 - 2008 Paul Mundt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Paul Mundt | 4b27c47 | 2007-11-28 19:58:11 +0900 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/rwsem.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/smp.h> |
| 23 | #include <linux/smp_lock.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/ptrace.h> |
| 26 | #include <linux/user.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 27 | #include <linux/signal.h> |
Christoph Hellwig | 481bed4 | 2005-11-07 00:59:47 -0800 | [diff] [blame] | 28 | #include <linux/syscalls.h> |
Paul Mundt | 4b27c47 | 2007-11-28 19:58:11 +0900 | [diff] [blame] | 29 | #include <linux/audit.h> |
Paul Mundt | c4637d4 | 2008-07-30 15:30:52 +0900 | [diff] [blame] | 30 | #include <linux/seccomp.h> |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 31 | #include <linux/tracehook.h> |
Paul Mundt | dd76279 | 2008-12-10 20:14:15 +0900 | [diff] [blame] | 32 | #include <linux/elf.h> |
| 33 | #include <linux/regset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <asm/io.h> |
| 35 | #include <asm/uaccess.h> |
| 36 | #include <asm/pgtable.h> |
| 37 | #include <asm/system.h> |
| 38 | #include <asm/processor.h> |
| 39 | #include <asm/mmu_context.h> |
Paul Mundt | fa43972 | 2008-09-04 18:53:58 +0900 | [diff] [blame] | 40 | #include <asm/syscalls.h> |
Adrian Bunk | 50387b3 | 2008-04-13 21:15:38 +0300 | [diff] [blame] | 41 | #include <asm/fpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Paul Mundt | a74f7e0 | 2009-09-16 14:30:34 +0900 | [diff] [blame] | 43 | #define CREATE_TRACE_POINTS |
| 44 | #include <trace/events/syscalls.h> |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | /* This mask defines the bits of the SR which the user is not allowed to |
| 47 | change, which are everything except S, Q, M, PR, SZ, FR. */ |
| 48 | #define SR_MASK (0xffff8cfd) |
| 49 | |
| 50 | /* |
| 51 | * does not yet catch signals sent when the child dies. |
| 52 | * in exit.c or in signal.c. |
| 53 | */ |
| 54 | |
| 55 | /* |
| 56 | * This routine will get a word from the user area in the process kernel stack. |
| 57 | */ |
| 58 | static inline int get_stack_long(struct task_struct *task, int offset) |
| 59 | { |
| 60 | unsigned char *stack; |
| 61 | |
| 62 | stack = (unsigned char *)(task->thread.uregs); |
| 63 | stack += offset; |
| 64 | return (*((int *)stack)); |
| 65 | } |
| 66 | |
| 67 | static inline unsigned long |
| 68 | get_fpu_long(struct task_struct *task, unsigned long addr) |
| 69 | { |
| 70 | unsigned long tmp; |
| 71 | struct pt_regs *regs; |
| 72 | regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1; |
| 73 | |
| 74 | if (!tsk_used_math(task)) { |
| 75 | if (addr == offsetof(struct user_fpu_struct, fpscr)) { |
| 76 | tmp = FPSCR_INIT; |
| 77 | } else { |
| 78 | tmp = 0xffffffffUL; /* matches initial value in fpu.c */ |
| 79 | } |
| 80 | return tmp; |
| 81 | } |
| 82 | |
| 83 | if (last_task_used_math == task) { |
Paul Mundt | 256b22c | 2007-11-10 20:27:03 +0900 | [diff] [blame] | 84 | enable_fpu(); |
Matt Fleming | 61cc7b0 | 2009-12-14 20:12:04 +0000 | [diff] [blame] | 85 | save_fpu(task); |
Paul Mundt | 256b22c | 2007-11-10 20:27:03 +0900 | [diff] [blame] | 86 | disable_fpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | last_task_used_math = 0; |
| 88 | regs->sr |= SR_FD; |
| 89 | } |
| 90 | |
Paul Mundt | 3ef2932 | 2010-01-19 15:40:03 +0900 | [diff] [blame] | 91 | tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | return tmp; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * This routine will put a word into the user area in the process kernel stack. |
| 97 | */ |
| 98 | static inline int put_stack_long(struct task_struct *task, int offset, |
| 99 | unsigned long data) |
| 100 | { |
| 101 | unsigned char *stack; |
| 102 | |
| 103 | stack = (unsigned char *)(task->thread.uregs); |
| 104 | stack += offset; |
| 105 | *(unsigned long *) stack = data; |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static inline int |
| 110 | put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data) |
| 111 | { |
| 112 | struct pt_regs *regs; |
| 113 | |
| 114 | regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1; |
| 115 | |
| 116 | if (!tsk_used_math(task)) { |
Paul Mundt | d6db888 | 2010-01-19 15:55:27 +0900 | [diff] [blame^] | 117 | init_fpu(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | } else if (last_task_used_math == task) { |
Paul Mundt | 256b22c | 2007-11-10 20:27:03 +0900 | [diff] [blame] | 119 | enable_fpu(); |
Matt Fleming | 61cc7b0 | 2009-12-14 20:12:04 +0000 | [diff] [blame] | 120 | save_fpu(task); |
Paul Mundt | 256b22c | 2007-11-10 20:27:03 +0900 | [diff] [blame] | 121 | disable_fpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | last_task_used_math = 0; |
| 123 | regs->sr |= SR_FD; |
| 124 | } |
| 125 | |
Paul Mundt | 3ef2932 | 2010-01-19 15:40:03 +0900 | [diff] [blame] | 126 | ((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | return 0; |
| 128 | } |
| 129 | |
Paul Mundt | c459dbf | 2008-07-30 19:09:31 +0900 | [diff] [blame] | 130 | void user_enable_single_step(struct task_struct *child) |
| 131 | { |
| 132 | struct pt_regs *regs = child->thread.uregs; |
| 133 | |
| 134 | regs->sr |= SR_SSTEP; /* auto-resetting upon exception */ |
| 135 | } |
| 136 | |
| 137 | void user_disable_single_step(struct task_struct *child) |
| 138 | { |
Adrian Bunk | e311be5 | 2008-08-22 18:20:36 +0300 | [diff] [blame] | 139 | struct pt_regs *regs = child->thread.uregs; |
| 140 | |
Paul Mundt | c459dbf | 2008-07-30 19:09:31 +0900 | [diff] [blame] | 141 | regs->sr &= ~SR_SSTEP; |
| 142 | } |
Christoph Hellwig | 481bed4 | 2005-11-07 00:59:47 -0800 | [diff] [blame] | 143 | |
Paul Mundt | dd76279 | 2008-12-10 20:14:15 +0900 | [diff] [blame] | 144 | static int genregs_get(struct task_struct *target, |
| 145 | const struct user_regset *regset, |
| 146 | unsigned int pos, unsigned int count, |
| 147 | void *kbuf, void __user *ubuf) |
| 148 | { |
| 149 | const struct pt_regs *regs = task_pt_regs(target); |
| 150 | int ret; |
| 151 | |
| 152 | /* PC, SR, SYSCALL */ |
| 153 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 154 | ®s->pc, |
| 155 | 0, 3 * sizeof(unsigned long long)); |
| 156 | |
| 157 | /* R1 -> R63 */ |
| 158 | if (!ret) |
| 159 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 160 | regs->regs, |
| 161 | offsetof(struct pt_regs, regs[0]), |
| 162 | 63 * sizeof(unsigned long long)); |
| 163 | /* TR0 -> TR7 */ |
| 164 | if (!ret) |
| 165 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 166 | regs->tregs, |
| 167 | offsetof(struct pt_regs, tregs[0]), |
| 168 | 8 * sizeof(unsigned long long)); |
| 169 | |
| 170 | if (!ret) |
| 171 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, |
| 172 | sizeof(struct pt_regs), -1); |
| 173 | |
| 174 | return ret; |
| 175 | } |
| 176 | |
| 177 | static int genregs_set(struct task_struct *target, |
| 178 | const struct user_regset *regset, |
| 179 | unsigned int pos, unsigned int count, |
| 180 | const void *kbuf, const void __user *ubuf) |
| 181 | { |
| 182 | struct pt_regs *regs = task_pt_regs(target); |
| 183 | int ret; |
| 184 | |
| 185 | /* PC, SR, SYSCALL */ |
| 186 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 187 | ®s->pc, |
| 188 | 0, 3 * sizeof(unsigned long long)); |
| 189 | |
| 190 | /* R1 -> R63 */ |
| 191 | if (!ret && count > 0) |
| 192 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 193 | regs->regs, |
| 194 | offsetof(struct pt_regs, regs[0]), |
| 195 | 63 * sizeof(unsigned long long)); |
| 196 | |
| 197 | /* TR0 -> TR7 */ |
| 198 | if (!ret && count > 0) |
| 199 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 200 | regs->tregs, |
| 201 | offsetof(struct pt_regs, tregs[0]), |
| 202 | 8 * sizeof(unsigned long long)); |
| 203 | |
| 204 | if (!ret) |
| 205 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
| 206 | sizeof(struct pt_regs), -1); |
| 207 | |
| 208 | return ret; |
| 209 | } |
| 210 | |
| 211 | #ifdef CONFIG_SH_FPU |
| 212 | int fpregs_get(struct task_struct *target, |
| 213 | const struct user_regset *regset, |
| 214 | unsigned int pos, unsigned int count, |
| 215 | void *kbuf, void __user *ubuf) |
| 216 | { |
| 217 | int ret; |
| 218 | |
| 219 | ret = init_fpu(target); |
| 220 | if (ret) |
| 221 | return ret; |
| 222 | |
| 223 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
Paul Mundt | 3ef2932 | 2010-01-19 15:40:03 +0900 | [diff] [blame] | 224 | &target->thread.xstate->hardfpu, 0, -1); |
Paul Mundt | dd76279 | 2008-12-10 20:14:15 +0900 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | static int fpregs_set(struct task_struct *target, |
| 228 | const struct user_regset *regset, |
| 229 | unsigned int pos, unsigned int count, |
| 230 | const void *kbuf, const void __user *ubuf) |
| 231 | { |
| 232 | int ret; |
| 233 | |
| 234 | ret = init_fpu(target); |
| 235 | if (ret) |
| 236 | return ret; |
| 237 | |
| 238 | set_stopped_child_used_math(target); |
| 239 | |
| 240 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
Paul Mundt | 3ef2932 | 2010-01-19 15:40:03 +0900 | [diff] [blame] | 241 | &target->thread.xstate->hardfpu, 0, -1); |
Paul Mundt | dd76279 | 2008-12-10 20:14:15 +0900 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | static int fpregs_active(struct task_struct *target, |
| 245 | const struct user_regset *regset) |
| 246 | { |
| 247 | return tsk_used_math(target) ? regset->n : 0; |
| 248 | } |
| 249 | #endif |
| 250 | |
| 251 | /* |
| 252 | * These are our native regset flavours. |
| 253 | */ |
| 254 | enum sh_regset { |
| 255 | REGSET_GENERAL, |
| 256 | #ifdef CONFIG_SH_FPU |
| 257 | REGSET_FPU, |
| 258 | #endif |
| 259 | }; |
| 260 | |
| 261 | static const struct user_regset sh_regsets[] = { |
| 262 | /* |
| 263 | * Format is: |
| 264 | * PC, SR, SYSCALL, |
| 265 | * R1 --> R63, |
| 266 | * TR0 --> TR7, |
| 267 | */ |
| 268 | [REGSET_GENERAL] = { |
| 269 | .core_note_type = NT_PRSTATUS, |
| 270 | .n = ELF_NGREG, |
| 271 | .size = sizeof(long long), |
| 272 | .align = sizeof(long long), |
| 273 | .get = genregs_get, |
| 274 | .set = genregs_set, |
| 275 | }, |
| 276 | |
| 277 | #ifdef CONFIG_SH_FPU |
| 278 | [REGSET_FPU] = { |
| 279 | .core_note_type = NT_PRFPREG, |
| 280 | .n = sizeof(struct user_fpu_struct) / |
| 281 | sizeof(long long), |
| 282 | .size = sizeof(long long), |
| 283 | .align = sizeof(long long), |
| 284 | .get = fpregs_get, |
| 285 | .set = fpregs_set, |
| 286 | .active = fpregs_active, |
| 287 | }, |
| 288 | #endif |
| 289 | }; |
| 290 | |
| 291 | static const struct user_regset_view user_sh64_native_view = { |
| 292 | .name = "sh64", |
| 293 | .e_machine = EM_SH, |
| 294 | .regsets = sh_regsets, |
| 295 | .n = ARRAY_SIZE(sh_regsets), |
| 296 | }; |
| 297 | |
| 298 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| 299 | { |
| 300 | return &user_sh64_native_view; |
| 301 | } |
| 302 | |
Christoph Hellwig | 481bed4 | 2005-11-07 00:59:47 -0800 | [diff] [blame] | 303 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | int ret; |
| 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | switch (request) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | /* read the word at location addr in the USER area. */ |
| 309 | case PTRACE_PEEKUSR: { |
| 310 | unsigned long tmp; |
| 311 | |
| 312 | ret = -EIO; |
| 313 | if ((addr & 3) || addr < 0) |
| 314 | break; |
| 315 | |
| 316 | if (addr < sizeof(struct pt_regs)) |
| 317 | tmp = get_stack_long(child, addr); |
| 318 | else if ((addr >= offsetof(struct user, fpu)) && |
| 319 | (addr < offsetof(struct user, u_fpvalid))) { |
| 320 | tmp = get_fpu_long(child, addr - offsetof(struct user, fpu)); |
| 321 | } else if (addr == offsetof(struct user, u_fpvalid)) { |
| 322 | tmp = !!tsk_used_math(child); |
| 323 | } else { |
| 324 | break; |
| 325 | } |
| 326 | ret = put_user(tmp, (unsigned long *)data); |
| 327 | break; |
| 328 | } |
| 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | case PTRACE_POKEUSR: |
| 331 | /* write the word at location addr in the USER area. We must |
| 332 | disallow any changes to certain SR bits or u_fpvalid, since |
| 333 | this could crash the kernel or result in a security |
| 334 | loophole. */ |
| 335 | ret = -EIO; |
| 336 | if ((addr & 3) || addr < 0) |
| 337 | break; |
| 338 | |
| 339 | if (addr < sizeof(struct pt_regs)) { |
| 340 | /* Ignore change of top 32 bits of SR */ |
| 341 | if (addr == offsetof (struct pt_regs, sr)+4) |
| 342 | { |
| 343 | ret = 0; |
| 344 | break; |
| 345 | } |
| 346 | /* If lower 32 bits of SR, ignore non-user bits */ |
| 347 | if (addr == offsetof (struct pt_regs, sr)) |
| 348 | { |
| 349 | long cursr = get_stack_long(child, addr); |
| 350 | data &= ~(SR_MASK); |
| 351 | data |= (cursr & SR_MASK); |
| 352 | } |
| 353 | ret = put_stack_long(child, addr, data); |
| 354 | } |
| 355 | else if ((addr >= offsetof(struct user, fpu)) && |
| 356 | (addr < offsetof(struct user, u_fpvalid))) { |
| 357 | ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data); |
| 358 | } |
| 359 | break; |
| 360 | |
Paul Mundt | dd76279 | 2008-12-10 20:14:15 +0900 | [diff] [blame] | 361 | case PTRACE_GETREGS: |
| 362 | return copy_regset_to_user(child, &user_sh64_native_view, |
| 363 | REGSET_GENERAL, |
| 364 | 0, sizeof(struct pt_regs), |
| 365 | (void __user *)data); |
| 366 | case PTRACE_SETREGS: |
| 367 | return copy_regset_from_user(child, &user_sh64_native_view, |
| 368 | REGSET_GENERAL, |
| 369 | 0, sizeof(struct pt_regs), |
| 370 | (const void __user *)data); |
| 371 | #ifdef CONFIG_SH_FPU |
| 372 | case PTRACE_GETFPREGS: |
| 373 | return copy_regset_to_user(child, &user_sh64_native_view, |
| 374 | REGSET_FPU, |
| 375 | 0, sizeof(struct user_fpu_struct), |
| 376 | (void __user *)data); |
| 377 | case PTRACE_SETFPREGS: |
| 378 | return copy_regset_from_user(child, &user_sh64_native_view, |
| 379 | REGSET_FPU, |
| 380 | 0, sizeof(struct user_fpu_struct), |
| 381 | (const void __user *)data); |
| 382 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | default: |
| 384 | ret = ptrace_request(child, request, addr, data); |
| 385 | break; |
| 386 | } |
Paul Mundt | dd76279 | 2008-12-10 20:14:15 +0900 | [diff] [blame] | 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | return ret; |
| 389 | } |
| 390 | |
Christoph Hellwig | 481bed4 | 2005-11-07 00:59:47 -0800 | [diff] [blame] | 391 | asmlinkage int sh64_ptrace(long request, long pid, long addr, long data) |
| 392 | { |
Christoph Hellwig | 481bed4 | 2005-11-07 00:59:47 -0800 | [diff] [blame] | 393 | #define WPC_DBRMODE 0x0d104008 |
| 394 | static int first_call = 1; |
| 395 | |
| 396 | lock_kernel(); |
| 397 | if (first_call) { |
| 398 | /* Set WPC.DBRMODE to 0. This makes all debug events get |
| 399 | * delivered through RESVEC, i.e. into the handlers in entry.S. |
| 400 | * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE |
| 401 | * would normally be left set to 1, which makes debug events get |
| 402 | * delivered through DBRVEC, i.e. into the remote gdb's |
| 403 | * handlers. This prevents ptrace getting them, and confuses |
| 404 | * the remote gdb.) */ |
| 405 | printk("DBRMODE set to 0 to permit native debugging\n"); |
| 406 | poke_real_address_q(WPC_DBRMODE, 0); |
| 407 | first_call = 0; |
| 408 | } |
| 409 | unlock_kernel(); |
| 410 | |
| 411 | return sys_ptrace(request, pid, addr, data); |
| 412 | } |
| 413 | |
Paul Mundt | 9e5e211 | 2008-07-30 20:05:35 +0900 | [diff] [blame] | 414 | static inline int audit_arch(void) |
| 415 | { |
| 416 | int arch = EM_SH; |
| 417 | |
| 418 | #ifdef CONFIG_64BIT |
| 419 | arch |= __AUDIT_ARCH_64BIT; |
| 420 | #endif |
| 421 | #ifdef CONFIG_CPU_LITTLE_ENDIAN |
| 422 | arch |= __AUDIT_ARCH_LE; |
| 423 | #endif |
| 424 | |
| 425 | return arch; |
| 426 | } |
| 427 | |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 428 | asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | { |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 430 | long long ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Paul Mundt | c4637d4 | 2008-07-30 15:30:52 +0900 | [diff] [blame] | 432 | secure_computing(regs->regs[9]); |
| 433 | |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 434 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
| 435 | tracehook_report_syscall_entry(regs)) |
| 436 | /* |
| 437 | * Tracing decided this syscall should not happen. |
| 438 | * We'll return a bogus call number to get an ENOSYS |
| 439 | * error, but leave the original number in regs->regs[0]. |
| 440 | */ |
| 441 | ret = -1LL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
Paul Mundt | a74f7e0 | 2009-09-16 14:30:34 +0900 | [diff] [blame] | 443 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| 444 | trace_sys_enter(regs, regs->regs[9]); |
| 445 | |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 446 | if (unlikely(current->audit_context)) |
Paul Mundt | 9e5e211 | 2008-07-30 20:05:35 +0900 | [diff] [blame] | 447 | audit_syscall_entry(audit_arch(), regs->regs[1], |
Paul Mundt | 4b27c47 | 2007-11-28 19:58:11 +0900 | [diff] [blame] | 448 | regs->regs[2], regs->regs[3], |
| 449 | regs->regs[4], regs->regs[5]); |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 450 | |
| 451 | return ret ?: regs->regs[9]; |
| 452 | } |
| 453 | |
| 454 | asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) |
| 455 | { |
| 456 | if (unlikely(current->audit_context)) |
| 457 | audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]), |
| 458 | regs->regs[9]); |
| 459 | |
Paul Mundt | a74f7e0 | 2009-09-16 14:30:34 +0900 | [diff] [blame] | 460 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| 461 | trace_sys_exit(regs, regs->regs[9]); |
| 462 | |
Paul Mundt | ab99c73 | 2008-07-30 19:55:30 +0900 | [diff] [blame] | 463 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
| 464 | tracehook_report_syscall_exit(regs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | /* Called with interrupts disabled */ |
| 468 | asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs) |
| 469 | { |
| 470 | /* This is called after a single step exception (DEBUGSS). |
| 471 | There is no need to change the PC, as it is a post-execution |
| 472 | exception, as entry.S does not do anything to the PC for DEBUGSS. |
| 473 | We need to clear the Single Step setting in SR to avoid |
| 474 | continually stepping. */ |
| 475 | local_irq_enable(); |
| 476 | regs->sr &= ~SR_SSTEP; |
| 477 | force_sig(SIGTRAP, current); |
| 478 | } |
| 479 | |
| 480 | /* Called with interrupts disabled */ |
| 481 | asmlinkage void do_software_break_point(unsigned long long vec, |
| 482 | struct pt_regs *regs) |
| 483 | { |
| 484 | /* We need to forward step the PC, to counteract the backstep done |
| 485 | in signal.c. */ |
| 486 | local_irq_enable(); |
| 487 | force_sig(SIGTRAP, current); |
| 488 | regs->pc += 4; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Called by kernel/ptrace.c when detaching.. |
| 493 | * |
| 494 | * Make sure single step bits etc are not set. |
| 495 | */ |
| 496 | void ptrace_disable(struct task_struct *child) |
| 497 | { |
Paul Mundt | c459dbf | 2008-07-30 19:09:31 +0900 | [diff] [blame] | 498 | user_disable_single_step(child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |