Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/mm.h> |
Paul Gortmaker | ce8b9d2 | 2011-07-18 12:03:53 -0400 | [diff] [blame] | 15 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/ptrace.h> |
| 18 | #include <linux/user.h> |
| 19 | #include <linux/security.h> |
| 20 | #include <linux/init.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 21 | #include <linux/signal.h> |
Russell King | 33fa9b1 | 2008-09-06 11:35:55 +0100 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 23 | #include <linux/perf_event.h> |
| 24 | #include <linux/hw_breakpoint.h> |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 25 | #include <linux/regset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <asm/pgtable.h> |
| 28 | #include <asm/system.h> |
| 29 | #include <asm/traps.h> |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Will Deacon | e513f8b | 2010-06-25 12:24:53 +0100 | [diff] [blame] | 57 | struct 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 | |
| 66 | static 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 | */ |
| 95 | int 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 | */ |
| 111 | const 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 | */ |
| 128 | bool 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 | */ |
| 143 | unsigned 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 159 | static inline long get_user_reg(struct task_struct *task, int offset) |
| 160 | { |
Al Viro | 815d5ec | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 161 | return task_pt_regs(task)->uregs[offset]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 170 | static inline int |
| 171 | put_user_reg(struct task_struct *task, int offset, long data) |
| 172 | { |
Al Viro | 815d5ec | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 173 | struct pt_regs newregs, *regs = task_pt_regs(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | /* |
| 188 | * Called by kernel/ptrace.c when detaching.. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | */ |
| 190 | void ptrace_disable(struct task_struct *child) |
| 191 | { |
Will Deacon | 425fc47 | 2011-02-14 14:31:09 +0100 | [diff] [blame] | 192 | /* Nothing to do. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | /* |
| 196 | * Handle hitting a breakpoint. |
| 197 | */ |
| 198 | void ptrace_break(struct task_struct *tsk, struct pt_regs *regs) |
| 199 | { |
| 200 | siginfo_t info; |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 210 | static int break_trap(struct pt_regs *regs, unsigned int instr) |
| 211 | { |
| 212 | ptrace_break(current, regs); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | static 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 | |
| 224 | static 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 | |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 232 | static struct undef_hook thumb2_break_hook = { |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 233 | .instr_mask = 0xffffffff, |
| 234 | .instr_val = 0xf7f0a000, |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 235 | .cpsr_mask = PSR_T_BIT, |
| 236 | .cpsr_val = PSR_T_BIT, |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 237 | .fn = break_trap, |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 238 | }; |
| 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | static int __init ptrace_break_init(void) |
| 241 | { |
| 242 | register_undef_hook(&arm_break_hook); |
| 243 | register_undef_hook(&thumb_break_hook); |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 244 | register_undef_hook(&thumb2_break_hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | core_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 | */ |
| 254 | static 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; |
Paul Brook | 68b7f715 | 2009-07-24 12:34:58 +0100 | [diff] [blame] | 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)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 279 | static 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | #ifdef CONFIG_IWMMXT |
| 292 | |
| 293 | /* |
| 294 | * Get the child iWMMXt state. |
| 295 | */ |
| 296 | static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp) |
| 297 | { |
Al Viro | e7c1b32 | 2006-01-12 01:05:56 -0800 | [diff] [blame] | 298 | struct thread_info *thread = task_thread_info(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) |
| 301 | return -ENODATA; |
| 302 | iwmmxt_task_disable(thread); /* force it to ram */ |
Russell King | cdaabbd | 2006-03-12 22:36:06 +0000 | [diff] [blame] | 303 | return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE) |
| 304 | ? -EFAULT : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | /* |
| 308 | * Set the child iWMMXt state. |
| 309 | */ |
| 310 | static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp) |
| 311 | { |
Al Viro | e7c1b32 | 2006-01-12 01:05:56 -0800 | [diff] [blame] | 312 | struct thread_info *thread = task_thread_info(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
| 314 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) |
| 315 | return -EACCES; |
| 316 | iwmmxt_task_release(thread); /* force a reload */ |
Russell King | 17320a9 | 2006-03-15 14:57:13 +0000 | [diff] [blame] | 317 | return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE) |
Russell King | cdaabbd | 2006-03-12 22:36:06 +0000 | [diff] [blame] | 318 | ? -EFAULT : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | #endif |
| 322 | |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 323 | #ifdef CONFIG_CRUNCH |
| 324 | /* |
| 325 | * Get the child Crunch state. |
| 326 | */ |
| 327 | static 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 | */ |
| 339 | static 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 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 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 | */ |
| 357 | static 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 | */ |
| 368 | static 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 | */ |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 378 | static void ptrace_hbptriggered(struct perf_event *bp, |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 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 | */ |
| 406 | void 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 | */ |
| 415 | void 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 | |
| 428 | static 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 | |
| 449 | static 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 | |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 461 | return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, |
| 462 | tsk); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | static 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 | |
Will Deacon | ba55d3d | 2011-02-25 20:19:32 +0100 | [diff] [blame] | 497 | if (num & 0x1) |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 498 | reg = bp->attr.bp_addr; |
Will Deacon | ba55d3d | 2011-02-25 20:19:32 +0100 | [diff] [blame] | 499 | else |
| 500 | reg = encode_ctrl_reg(arch_ctrl); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | put: |
| 504 | if (put_user(reg, data)) |
| 505 | ret = -EFAULT; |
| 506 | |
| 507 | out: |
| 508 | return ret; |
| 509 | } |
| 510 | |
| 511 | static 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) { |
Will Deacon | ce9b1b0 | 2010-11-25 12:59:31 +0000 | [diff] [blame] | 561 | ret = -EINVAL; |
| 562 | goto out; |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 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); |
| 571 | out: |
| 572 | return ret; |
| 573 | } |
| 574 | #endif |
| 575 | |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 576 | /* regset get/set implementations */ |
| 577 | |
| 578 | static 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 | |
| 590 | static 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 | |
| 611 | static 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 | |
| 621 | static 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 | */ |
| 658 | static 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 | */ |
| 695 | static 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); |
Dave Martin | 247f499 | 2012-01-30 20:22:28 +0100 | [diff] [blame^] | 702 | struct vfp_hard_struct new_vfp; |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 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 | |
Dave Martin | 247f499 | 2012-01-30 20:22:28 +0100 | [diff] [blame^] | 706 | vfp_sync_hwstate(thread); |
| 707 | new_vfp = thread->vfpstate.hard; |
| 708 | |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 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 | |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 729 | thread->vfpstate.hard = new_vfp; |
| 730 | vfp_flush_hwstate(thread); |
| 731 | |
| 732 | return 0; |
| 733 | } |
| 734 | #endif /* CONFIG_VFP */ |
| 735 | |
| 736 | enum arm_regset { |
| 737 | REGSET_GPR, |
| 738 | REGSET_FPR, |
| 739 | #ifdef CONFIG_VFP |
| 740 | REGSET_VFP, |
| 741 | #endif |
| 742 | }; |
| 743 | |
| 744 | static 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 | |
| 781 | static 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 | |
| 786 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| 787 | { |
| 788 | return &user_arm_view; |
| 789 | } |
| 790 | |
Namhyung Kim | 9b05a69 | 2010-10-27 15:33:47 -0700 | [diff] [blame] | 791 | long arch_ptrace(struct task_struct *child, long request, |
| 792 | unsigned long addr, unsigned long data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | int ret; |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 795 | unsigned long __user *datap = (unsigned long __user *) data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | switch (request) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | case PTRACE_PEEKUSR: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 799 | ret = ptrace_read_user(child, addr, datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | break; |
| 801 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | case PTRACE_POKEUSR: |
| 803 | ret = ptrace_write_user(child, addr, data); |
| 804 | break; |
| 805 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | case PTRACE_GETREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 807 | ret = copy_regset_to_user(child, |
| 808 | &user_arm_view, REGSET_GPR, |
| 809 | 0, sizeof(struct pt_regs), |
| 810 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | break; |
| 812 | |
| 813 | case PTRACE_SETREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 814 | ret = copy_regset_from_user(child, |
| 815 | &user_arm_view, REGSET_GPR, |
| 816 | 0, sizeof(struct pt_regs), |
| 817 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | break; |
| 819 | |
| 820 | case PTRACE_GETFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 821 | ret = copy_regset_to_user(child, |
| 822 | &user_arm_view, REGSET_FPR, |
| 823 | 0, sizeof(union fp_state), |
| 824 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | break; |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | case PTRACE_SETFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 828 | ret = copy_regset_from_user(child, |
| 829 | &user_arm_view, REGSET_FPR, |
| 830 | 0, sizeof(union fp_state), |
| 831 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | break; |
| 833 | |
| 834 | #ifdef CONFIG_IWMMXT |
| 835 | case PTRACE_GETWMMXREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 836 | ret = ptrace_getwmmxregs(child, datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | break; |
| 838 | |
| 839 | case PTRACE_SETWMMXREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 840 | ret = ptrace_setwmmxregs(child, datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | break; |
| 842 | #endif |
| 843 | |
| 844 | case PTRACE_GET_THREAD_AREA: |
Al Viro | e7c1b32 | 2006-01-12 01:05:56 -0800 | [diff] [blame] | 845 | ret = put_user(task_thread_info(child)->tp_value, |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 846 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | break; |
| 848 | |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 849 | case PTRACE_SET_SYSCALL: |
Russell King | 5ba6d3f | 2007-05-06 13:56:26 +0100 | [diff] [blame] | 850 | task_thread_info(child)->syscall = data; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 851 | ret = 0; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 852 | break; |
| 853 | |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 854 | #ifdef CONFIG_CRUNCH |
| 855 | case PTRACE_GETCRUNCHREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 856 | ret = ptrace_getcrunchregs(child, datap); |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 857 | break; |
| 858 | |
| 859 | case PTRACE_SETCRUNCHREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 860 | ret = ptrace_setcrunchregs(child, datap); |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 861 | break; |
| 862 | #endif |
| 863 | |
Catalin Marinas | 3d1228e | 2009-02-11 13:12:56 +0100 | [diff] [blame] | 864 | #ifdef CONFIG_VFP |
| 865 | case PTRACE_GETVFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 866 | ret = copy_regset_to_user(child, |
| 867 | &user_arm_view, REGSET_VFP, |
| 868 | 0, ARM_VFPREGS_SIZE, |
| 869 | datap); |
Catalin Marinas | 3d1228e | 2009-02-11 13:12:56 +0100 | [diff] [blame] | 870 | break; |
| 871 | |
| 872 | case PTRACE_SETVFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 873 | ret = copy_regset_from_user(child, |
| 874 | &user_arm_view, REGSET_VFP, |
| 875 | 0, ARM_VFPREGS_SIZE, |
| 876 | datap); |
Catalin Marinas | 3d1228e | 2009-02-11 13:12:56 +0100 | [diff] [blame] | 877 | break; |
| 878 | #endif |
| 879 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 880 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 881 | case PTRACE_GETHBPREGS: |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 882 | if (ptrace_get_breakpoints(child) < 0) |
| 883 | return -ESRCH; |
| 884 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 885 | ret = ptrace_gethbpregs(child, addr, |
| 886 | (unsigned long __user *)data); |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 887 | ptrace_put_breakpoints(child); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 888 | break; |
| 889 | case PTRACE_SETHBPREGS: |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 890 | if (ptrace_get_breakpoints(child) < 0) |
| 891 | return -ESRCH; |
| 892 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 893 | ret = ptrace_sethbpregs(child, addr, |
| 894 | (unsigned long __user *)data); |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 895 | ptrace_put_breakpoints(child); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 896 | break; |
| 897 | #endif |
| 898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | default: |
| 900 | ret = ptrace_request(child, request, addr, data); |
| 901 | break; |
| 902 | } |
| 903 | |
| 904 | return ret; |
| 905 | } |
| 906 | |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 907 | asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | { |
| 909 | unsigned long ip; |
| 910 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Nathaniel Husted | 29ef73b | 2012-01-03 14:23:09 -0500 | [diff] [blame] | 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 | |
Russell King | 5ba6d3f | 2007-05-06 13:56:26 +0100 | [diff] [blame] | 929 | current_thread_info()->syscall = scno; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 945 | |
Russell King | 5ba6d3f | 2007-05-06 13:56:26 +0100 | [diff] [blame] | 946 | return current_thread_info()->syscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |