Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* By Ross Biro 1/23/92 */ |
| 2 | /* |
| 3 | * Pentium III FXSR, SSE support |
| 4 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 5 | * |
| 6 | * BTS tracing |
| 7 | * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/errno.h> |
| 15 | #include <linux/ptrace.h> |
Roland McGrath | 91e7b70 | 2008-01-30 13:31:52 +0100 | [diff] [blame] | 16 | #include <linux/regset.h> |
Roland McGrath | eeea3c3 | 2008-03-16 23:36:28 -0700 | [diff] [blame] | 17 | #include <linux/tracehook.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/user.h> |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 19 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/security.h> |
| 21 | #include <linux/audit.h> |
| 22 | #include <linux/seccomp.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 23 | #include <linux/signal.h> |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 24 | #include <linux/workqueue.h> |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 25 | #include <linux/perf_event.h> |
| 26 | #include <linux/hw_breakpoint.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/pgtable.h> |
| 30 | #include <asm/system.h> |
| 31 | #include <asm/processor.h> |
| 32 | #include <asm/i387.h> |
| 33 | #include <asm/debugreg.h> |
| 34 | #include <asm/ldt.h> |
| 35 | #include <asm/desc.h> |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 36 | #include <asm/prctl.h> |
| 37 | #include <asm/proto.h> |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 38 | #include <asm/ds.h> |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 39 | #include <asm/hw_breakpoint.h> |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 40 | |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 41 | #include "tls.h" |
| 42 | |
Josh Stone | 1c569f0 | 2009-08-24 14:43:14 -0700 | [diff] [blame] | 43 | #define CREATE_TRACE_POINTS |
| 44 | #include <trace/events/syscalls.h> |
| 45 | |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 46 | enum x86_regset { |
| 47 | REGSET_GENERAL, |
| 48 | REGSET_FP, |
| 49 | REGSET_XFP, |
Roland McGrath | 325af5f | 2008-08-08 15:58:39 -0700 | [diff] [blame] | 50 | REGSET_IOPERM64 = REGSET_XFP, |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 51 | REGSET_TLS, |
Roland McGrath | 325af5f | 2008-08-08 15:58:39 -0700 | [diff] [blame] | 52 | REGSET_IOPERM32, |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 53 | }; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 54 | |
Masami Hiramatsu | b1cf540 | 2009-08-13 16:34:44 -0400 | [diff] [blame] | 55 | struct pt_regs_offset { |
| 56 | const char *name; |
| 57 | int offset; |
| 58 | }; |
| 59 | |
| 60 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} |
| 61 | #define REG_OFFSET_END {.name = NULL, .offset = 0} |
| 62 | |
| 63 | static const struct pt_regs_offset regoffset_table[] = { |
| 64 | #ifdef CONFIG_X86_64 |
| 65 | REG_OFFSET_NAME(r15), |
| 66 | REG_OFFSET_NAME(r14), |
| 67 | REG_OFFSET_NAME(r13), |
| 68 | REG_OFFSET_NAME(r12), |
| 69 | REG_OFFSET_NAME(r11), |
| 70 | REG_OFFSET_NAME(r10), |
| 71 | REG_OFFSET_NAME(r9), |
| 72 | REG_OFFSET_NAME(r8), |
| 73 | #endif |
| 74 | REG_OFFSET_NAME(bx), |
| 75 | REG_OFFSET_NAME(cx), |
| 76 | REG_OFFSET_NAME(dx), |
| 77 | REG_OFFSET_NAME(si), |
| 78 | REG_OFFSET_NAME(di), |
| 79 | REG_OFFSET_NAME(bp), |
| 80 | REG_OFFSET_NAME(ax), |
| 81 | #ifdef CONFIG_X86_32 |
| 82 | REG_OFFSET_NAME(ds), |
| 83 | REG_OFFSET_NAME(es), |
| 84 | REG_OFFSET_NAME(fs), |
| 85 | REG_OFFSET_NAME(gs), |
| 86 | #endif |
| 87 | REG_OFFSET_NAME(orig_ax), |
| 88 | REG_OFFSET_NAME(ip), |
| 89 | REG_OFFSET_NAME(cs), |
| 90 | REG_OFFSET_NAME(flags), |
| 91 | REG_OFFSET_NAME(sp), |
| 92 | REG_OFFSET_NAME(ss), |
| 93 | REG_OFFSET_END, |
| 94 | }; |
| 95 | |
| 96 | /** |
| 97 | * regs_query_register_offset() - query register offset from its name |
| 98 | * @name: the name of a register |
| 99 | * |
| 100 | * regs_query_register_offset() returns the offset of a register in struct |
| 101 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; |
| 102 | */ |
| 103 | int regs_query_register_offset(const char *name) |
| 104 | { |
| 105 | const struct pt_regs_offset *roff; |
| 106 | for (roff = regoffset_table; roff->name != NULL; roff++) |
| 107 | if (!strcmp(roff->name, name)) |
| 108 | return roff->offset; |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * regs_query_register_name() - query register name from its offset |
| 114 | * @offset: the offset of a register in struct pt_regs. |
| 115 | * |
| 116 | * regs_query_register_name() returns the name of a register from its |
| 117 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; |
| 118 | */ |
| 119 | const char *regs_query_register_name(unsigned int offset) |
| 120 | { |
| 121 | const struct pt_regs_offset *roff; |
| 122 | for (roff = regoffset_table; roff->name != NULL; roff++) |
| 123 | if (roff->offset == offset) |
| 124 | return roff->name; |
| 125 | return NULL; |
| 126 | } |
| 127 | |
| 128 | static const int arg_offs_table[] = { |
| 129 | #ifdef CONFIG_X86_32 |
| 130 | [0] = offsetof(struct pt_regs, ax), |
| 131 | [1] = offsetof(struct pt_regs, dx), |
| 132 | [2] = offsetof(struct pt_regs, cx) |
| 133 | #else /* CONFIG_X86_64 */ |
| 134 | [0] = offsetof(struct pt_regs, di), |
| 135 | [1] = offsetof(struct pt_regs, si), |
| 136 | [2] = offsetof(struct pt_regs, dx), |
| 137 | [3] = offsetof(struct pt_regs, cx), |
| 138 | [4] = offsetof(struct pt_regs, r8), |
| 139 | [5] = offsetof(struct pt_regs, r9) |
| 140 | #endif |
| 141 | }; |
| 142 | |
| 143 | /** |
| 144 | * regs_get_argument_nth() - get Nth argument at function call |
| 145 | * @regs: pt_regs which contains registers at function entry. |
| 146 | * @n: argument number. |
| 147 | * |
| 148 | * regs_get_argument_nth() returns @n th argument of a function call. |
| 149 | * Since usually the kernel stack will be changed right after function entry, |
| 150 | * you must use this at function entry. If the @n th entry is NOT in the |
| 151 | * kernel stack or pt_regs, this returns 0. |
| 152 | */ |
| 153 | unsigned long regs_get_argument_nth(struct pt_regs *regs, unsigned int n) |
| 154 | { |
| 155 | if (n < ARRAY_SIZE(arg_offs_table)) |
Masami Hiramatsu | ad5cafc | 2009-09-10 19:53:06 -0400 | [diff] [blame] | 156 | return *(unsigned long *)((char *)regs + arg_offs_table[n]); |
Masami Hiramatsu | b1cf540 | 2009-08-13 16:34:44 -0400 | [diff] [blame] | 157 | else { |
| 158 | /* |
| 159 | * The typical case: arg n is on the stack. |
| 160 | * (Note: stack[0] = return address, so skip it) |
| 161 | */ |
| 162 | n -= ARRAY_SIZE(arg_offs_table); |
| 163 | return regs_get_kernel_stack_nth(regs, 1 + n); |
| 164 | } |
| 165 | } |
| 166 | |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 167 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | * does not yet catch signals sent when the child dies. |
| 169 | * in exit.c or in signal.c. |
| 170 | */ |
| 171 | |
Chuck Ebbert | 9f155b9 | 2006-01-05 23:11:29 -0500 | [diff] [blame] | 172 | /* |
| 173 | * Determines which flags the user has access to [1 = access, 0 = no access]. |
Chuck Ebbert | 9f155b9 | 2006-01-05 23:11:29 -0500 | [diff] [blame] | 174 | */ |
Roland McGrath | e39c289 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 175 | #define FLAG_MASK_32 ((unsigned long) \ |
| 176 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ |
| 177 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ |
| 178 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ |
| 179 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ |
| 180 | X86_EFLAGS_RF | X86_EFLAGS_AC)) |
| 181 | |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 182 | /* |
| 183 | * Determines whether a value may be installed in a segment register. |
| 184 | */ |
| 185 | static inline bool invalid_selector(u16 value) |
| 186 | { |
| 187 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); |
| 188 | } |
| 189 | |
| 190 | #ifdef CONFIG_X86_32 |
| 191 | |
Roland McGrath | e39c289 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 192 | #define FLAG_MASK FLAG_MASK_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Jaswinder Singh | 4fe702c | 2008-07-25 10:19:27 +0530 | [diff] [blame] | 194 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | { |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 196 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
Tejun Heo | ccbeed3 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 197 | return ®s->bx + (regno >> 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } |
| 199 | |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 200 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 202 | /* |
| 203 | * Returning the value truncates it to 16 bits. |
| 204 | */ |
| 205 | unsigned int retval; |
| 206 | if (offset != offsetof(struct user_regs_struct, gs)) |
| 207 | retval = *pt_regs_access(task_pt_regs(task), offset); |
| 208 | else { |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 209 | if (task == current) |
Tejun Heo | d9a89a2 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 210 | retval = get_user_gs(task_pt_regs(task)); |
| 211 | else |
| 212 | retval = task_user_gs(task); |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 213 | } |
| 214 | return retval; |
| 215 | } |
| 216 | |
| 217 | static int set_segment_reg(struct task_struct *task, |
| 218 | unsigned long offset, u16 value) |
| 219 | { |
| 220 | /* |
| 221 | * The value argument was already truncated to 16 bits. |
| 222 | */ |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 223 | if (invalid_selector(value)) |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 224 | return -EIO; |
| 225 | |
Roland McGrath | c63855d | 2008-02-06 22:39:44 +0100 | [diff] [blame] | 226 | /* |
| 227 | * For %cs and %ss we cannot permit a null selector. |
| 228 | * We can permit a bogus selector as long as it has USER_RPL. |
| 229 | * Null selectors are fine for other segment registers, but |
| 230 | * we will never get back to user mode with invalid %cs or %ss |
| 231 | * and will take the trap in iret instead. Much code relies |
| 232 | * on user_mode() to distinguish a user trap frame (which can |
| 233 | * safely use invalid selectors) from a kernel trap frame. |
| 234 | */ |
| 235 | switch (offset) { |
| 236 | case offsetof(struct user_regs_struct, cs): |
| 237 | case offsetof(struct user_regs_struct, ss): |
| 238 | if (unlikely(value == 0)) |
| 239 | return -EIO; |
| 240 | |
| 241 | default: |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 242 | *pt_regs_access(task_pt_regs(task), offset) = value; |
Roland McGrath | c63855d | 2008-02-06 22:39:44 +0100 | [diff] [blame] | 243 | break; |
| 244 | |
| 245 | case offsetof(struct user_regs_struct, gs): |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 246 | if (task == current) |
Tejun Heo | d9a89a2 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 247 | set_user_gs(task_pt_regs(task), value); |
| 248 | else |
| 249 | task_user_gs(task) = value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | return 0; |
| 253 | } |
| 254 | |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 255 | #else /* CONFIG_X86_64 */ |
| 256 | |
| 257 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) |
| 258 | |
| 259 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) |
| 260 | { |
| 261 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); |
| 262 | return ®s->r15 + (offset / sizeof(regs->r15)); |
| 263 | } |
| 264 | |
| 265 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
| 266 | { |
| 267 | /* |
| 268 | * Returning the value truncates it to 16 bits. |
| 269 | */ |
| 270 | unsigned int seg; |
| 271 | |
| 272 | switch (offset) { |
| 273 | case offsetof(struct user_regs_struct, fs): |
| 274 | if (task == current) { |
| 275 | /* Older gas can't assemble movq %?s,%r?? */ |
| 276 | asm("movl %%fs,%0" : "=r" (seg)); |
| 277 | return seg; |
| 278 | } |
| 279 | return task->thread.fsindex; |
| 280 | case offsetof(struct user_regs_struct, gs): |
| 281 | if (task == current) { |
| 282 | asm("movl %%gs,%0" : "=r" (seg)); |
| 283 | return seg; |
| 284 | } |
| 285 | return task->thread.gsindex; |
| 286 | case offsetof(struct user_regs_struct, ds): |
| 287 | if (task == current) { |
| 288 | asm("movl %%ds,%0" : "=r" (seg)); |
| 289 | return seg; |
| 290 | } |
| 291 | return task->thread.ds; |
| 292 | case offsetof(struct user_regs_struct, es): |
| 293 | if (task == current) { |
| 294 | asm("movl %%es,%0" : "=r" (seg)); |
| 295 | return seg; |
| 296 | } |
| 297 | return task->thread.es; |
| 298 | |
| 299 | case offsetof(struct user_regs_struct, cs): |
| 300 | case offsetof(struct user_regs_struct, ss): |
| 301 | break; |
| 302 | } |
| 303 | return *pt_regs_access(task_pt_regs(task), offset); |
| 304 | } |
| 305 | |
| 306 | static int set_segment_reg(struct task_struct *task, |
| 307 | unsigned long offset, u16 value) |
| 308 | { |
| 309 | /* |
| 310 | * The value argument was already truncated to 16 bits. |
| 311 | */ |
| 312 | if (invalid_selector(value)) |
| 313 | return -EIO; |
| 314 | |
| 315 | switch (offset) { |
| 316 | case offsetof(struct user_regs_struct,fs): |
| 317 | /* |
| 318 | * If this is setting fs as for normal 64-bit use but |
| 319 | * setting fs_base has implicitly changed it, leave it. |
| 320 | */ |
| 321 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && |
| 322 | task->thread.fs != 0) || |
| 323 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && |
| 324 | task->thread.fs == 0)) |
| 325 | break; |
| 326 | task->thread.fsindex = value; |
| 327 | if (task == current) |
| 328 | loadsegment(fs, task->thread.fsindex); |
| 329 | break; |
| 330 | case offsetof(struct user_regs_struct,gs): |
| 331 | /* |
| 332 | * If this is setting gs as for normal 64-bit use but |
| 333 | * setting gs_base has implicitly changed it, leave it. |
| 334 | */ |
| 335 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && |
| 336 | task->thread.gs != 0) || |
| 337 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && |
| 338 | task->thread.gs == 0)) |
| 339 | break; |
| 340 | task->thread.gsindex = value; |
| 341 | if (task == current) |
| 342 | load_gs_index(task->thread.gsindex); |
| 343 | break; |
| 344 | case offsetof(struct user_regs_struct,ds): |
| 345 | task->thread.ds = value; |
| 346 | if (task == current) |
| 347 | loadsegment(ds, task->thread.ds); |
| 348 | break; |
| 349 | case offsetof(struct user_regs_struct,es): |
| 350 | task->thread.es = value; |
| 351 | if (task == current) |
| 352 | loadsegment(es, task->thread.es); |
| 353 | break; |
| 354 | |
| 355 | /* |
| 356 | * Can't actually change these in 64-bit mode. |
| 357 | */ |
| 358 | case offsetof(struct user_regs_struct,cs): |
Roland McGrath | c63855d | 2008-02-06 22:39:44 +0100 | [diff] [blame] | 359 | if (unlikely(value == 0)) |
| 360 | return -EIO; |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 361 | #ifdef CONFIG_IA32_EMULATION |
| 362 | if (test_tsk_thread_flag(task, TIF_IA32)) |
| 363 | task_pt_regs(task)->cs = value; |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 364 | #endif |
Roland McGrath | cb757c4 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 365 | break; |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 366 | case offsetof(struct user_regs_struct,ss): |
Roland McGrath | c63855d | 2008-02-06 22:39:44 +0100 | [diff] [blame] | 367 | if (unlikely(value == 0)) |
| 368 | return -EIO; |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 369 | #ifdef CONFIG_IA32_EMULATION |
| 370 | if (test_tsk_thread_flag(task, TIF_IA32)) |
| 371 | task_pt_regs(task)->ss = value; |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 372 | #endif |
Roland McGrath | cb757c4 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 373 | break; |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | return 0; |
| 377 | } |
| 378 | |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 379 | #endif /* CONFIG_X86_32 */ |
| 380 | |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 381 | static unsigned long get_flags(struct task_struct *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 383 | unsigned long retval = task_pt_regs(task)->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 385 | /* |
| 386 | * If the debugger set TF, hide it from the readout. |
| 387 | */ |
| 388 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
| 389 | retval &= ~X86_EFLAGS_TF; |
| 390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | return retval; |
| 392 | } |
| 393 | |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 394 | static int set_flags(struct task_struct *task, unsigned long value) |
| 395 | { |
| 396 | struct pt_regs *regs = task_pt_regs(task); |
| 397 | |
| 398 | /* |
| 399 | * If the user value contains TF, mark that |
| 400 | * it was not "us" (the debugger) that set it. |
| 401 | * If not, make sure it stays set if we had. |
| 402 | */ |
| 403 | if (value & X86_EFLAGS_TF) |
| 404 | clear_tsk_thread_flag(task, TIF_FORCED_TF); |
| 405 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
| 406 | value |= X86_EFLAGS_TF; |
| 407 | |
| 408 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); |
| 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | static int putreg(struct task_struct *child, |
| 414 | unsigned long offset, unsigned long value) |
| 415 | { |
| 416 | switch (offset) { |
| 417 | case offsetof(struct user_regs_struct, cs): |
| 418 | case offsetof(struct user_regs_struct, ds): |
| 419 | case offsetof(struct user_regs_struct, es): |
| 420 | case offsetof(struct user_regs_struct, fs): |
| 421 | case offsetof(struct user_regs_struct, gs): |
| 422 | case offsetof(struct user_regs_struct, ss): |
| 423 | return set_segment_reg(child, offset, value); |
| 424 | |
| 425 | case offsetof(struct user_regs_struct, flags): |
| 426 | return set_flags(child, value); |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 427 | |
| 428 | #ifdef CONFIG_X86_64 |
| 429 | case offsetof(struct user_regs_struct,fs_base): |
| 430 | if (value >= TASK_SIZE_OF(child)) |
| 431 | return -EIO; |
| 432 | /* |
| 433 | * When changing the segment base, use do_arch_prctl |
| 434 | * to set either thread.fs or thread.fsindex and the |
| 435 | * corresponding GDT slot. |
| 436 | */ |
| 437 | if (child->thread.fs != value) |
| 438 | return do_arch_prctl(child, ARCH_SET_FS, value); |
| 439 | return 0; |
| 440 | case offsetof(struct user_regs_struct,gs_base): |
| 441 | /* |
| 442 | * Exactly the same here as the %fs handling above. |
| 443 | */ |
| 444 | if (value >= TASK_SIZE_OF(child)) |
| 445 | return -EIO; |
| 446 | if (child->thread.gs != value) |
| 447 | return do_arch_prctl(child, ARCH_SET_GS, value); |
| 448 | return 0; |
| 449 | #endif |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | *pt_regs_access(task_pt_regs(child), offset) = value; |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | static unsigned long getreg(struct task_struct *task, unsigned long offset) |
| 457 | { |
| 458 | switch (offset) { |
| 459 | case offsetof(struct user_regs_struct, cs): |
| 460 | case offsetof(struct user_regs_struct, ds): |
| 461 | case offsetof(struct user_regs_struct, es): |
| 462 | case offsetof(struct user_regs_struct, fs): |
| 463 | case offsetof(struct user_regs_struct, gs): |
| 464 | case offsetof(struct user_regs_struct, ss): |
| 465 | return get_segment_reg(task, offset); |
| 466 | |
| 467 | case offsetof(struct user_regs_struct, flags): |
| 468 | return get_flags(task); |
Roland McGrath | 2047b08 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 469 | |
| 470 | #ifdef CONFIG_X86_64 |
| 471 | case offsetof(struct user_regs_struct, fs_base): { |
| 472 | /* |
| 473 | * do_arch_prctl may have used a GDT slot instead of |
| 474 | * the MSR. To userland, it appears the same either |
| 475 | * way, except the %fs segment selector might not be 0. |
| 476 | */ |
| 477 | unsigned int seg = task->thread.fsindex; |
| 478 | if (task->thread.fs != 0) |
| 479 | return task->thread.fs; |
| 480 | if (task == current) |
| 481 | asm("movl %%fs,%0" : "=r" (seg)); |
| 482 | if (seg != FS_TLS_SEL) |
| 483 | return 0; |
| 484 | return get_desc_base(&task->thread.tls_array[FS_TLS]); |
| 485 | } |
| 486 | case offsetof(struct user_regs_struct, gs_base): { |
| 487 | /* |
| 488 | * Exactly the same here as the %fs handling above. |
| 489 | */ |
| 490 | unsigned int seg = task->thread.gsindex; |
| 491 | if (task->thread.gs != 0) |
| 492 | return task->thread.gs; |
| 493 | if (task == current) |
| 494 | asm("movl %%gs,%0" : "=r" (seg)); |
| 495 | if (seg != GS_TLS_SEL) |
| 496 | return 0; |
| 497 | return get_desc_base(&task->thread.tls_array[GS_TLS]); |
| 498 | } |
| 499 | #endif |
Roland McGrath | 06ee1b6 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | return *pt_regs_access(task_pt_regs(task), offset); |
| 503 | } |
| 504 | |
Roland McGrath | 91e7b70 | 2008-01-30 13:31:52 +0100 | [diff] [blame] | 505 | static int genregs_get(struct task_struct *target, |
| 506 | const struct user_regset *regset, |
| 507 | unsigned int pos, unsigned int count, |
| 508 | void *kbuf, void __user *ubuf) |
| 509 | { |
| 510 | if (kbuf) { |
| 511 | unsigned long *k = kbuf; |
| 512 | while (count > 0) { |
| 513 | *k++ = getreg(target, pos); |
| 514 | count -= sizeof(*k); |
| 515 | pos += sizeof(*k); |
| 516 | } |
| 517 | } else { |
| 518 | unsigned long __user *u = ubuf; |
| 519 | while (count > 0) { |
| 520 | if (__put_user(getreg(target, pos), u++)) |
| 521 | return -EFAULT; |
| 522 | count -= sizeof(*u); |
| 523 | pos += sizeof(*u); |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | static int genregs_set(struct task_struct *target, |
| 531 | const struct user_regset *regset, |
| 532 | unsigned int pos, unsigned int count, |
| 533 | const void *kbuf, const void __user *ubuf) |
| 534 | { |
| 535 | int ret = 0; |
| 536 | if (kbuf) { |
| 537 | const unsigned long *k = kbuf; |
| 538 | while (count > 0 && !ret) { |
| 539 | ret = putreg(target, pos, *k++); |
| 540 | count -= sizeof(*k); |
| 541 | pos += sizeof(*k); |
| 542 | } |
| 543 | } else { |
| 544 | const unsigned long __user *u = ubuf; |
| 545 | while (count > 0 && !ret) { |
| 546 | unsigned long word; |
| 547 | ret = __get_user(word, u++); |
| 548 | if (ret) |
| 549 | break; |
| 550 | ret = putreg(target, pos, word); |
| 551 | count -= sizeof(*u); |
| 552 | pos += sizeof(*u); |
| 553 | } |
| 554 | } |
| 555 | return ret; |
| 556 | } |
| 557 | |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 558 | static void ptrace_triggered(struct perf_event *bp, int nmi, |
| 559 | struct perf_sample_data *data, |
| 560 | struct pt_regs *regs) |
Roland McGrath | d9771e8 | 2008-01-30 13:30:52 +0100 | [diff] [blame] | 561 | { |
Roland McGrath | 0f53409 | 2008-01-30 13:30:59 +0100 | [diff] [blame] | 562 | int i; |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 563 | struct thread_struct *thread = &(current->thread); |
Roland McGrath | 0f53409 | 2008-01-30 13:30:59 +0100 | [diff] [blame] | 564 | |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 565 | /* |
| 566 | * Store in the virtual DR6 register the fact that the breakpoint |
| 567 | * was hit so the thread's debugger will see it. |
| 568 | */ |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 569 | for (i = 0; i < HBP_NUM; i++) { |
| 570 | if (thread->ptrace_bps[i] == bp) |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 571 | break; |
Roland McGrath | d9771e8 | 2008-01-30 13:30:52 +0100 | [diff] [blame] | 572 | } |
Roland McGrath | d9771e8 | 2008-01-30 13:30:52 +0100 | [diff] [blame] | 573 | |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 574 | thread->debugreg6 |= (DR_TRAP0 << i); |
| 575 | } |
| 576 | |
| 577 | /* |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 578 | * Walk through every ptrace breakpoints for this thread and |
| 579 | * build the dr7 value on top of their attributes. |
| 580 | * |
| 581 | */ |
| 582 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
| 583 | { |
| 584 | int i; |
| 585 | int dr7 = 0; |
| 586 | struct arch_hw_breakpoint *info; |
| 587 | |
| 588 | for (i = 0; i < HBP_NUM; i++) { |
| 589 | if (bp[i] && !bp[i]->attr.disabled) { |
| 590 | info = counter_arch_bp(bp[i]); |
| 591 | dr7 |= encode_dr7(i, info->len, info->type); |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | return dr7; |
| 596 | } |
| 597 | |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 598 | static int |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 599 | ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
Frederic Weisbecker | 1cedae7 | 2009-12-02 07:32:16 +0100 | [diff] [blame] | 600 | struct task_struct *tsk, int disabled) |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 601 | { |
| 602 | int err; |
| 603 | int gen_len, gen_type; |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 604 | struct perf_event_attr attr; |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 605 | |
| 606 | /* |
| 607 | * We shoud have at least an inactive breakpoint at this |
| 608 | * slot. It means the user is writing dr7 without having |
| 609 | * written the address register first |
| 610 | */ |
| 611 | if (!bp) |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 612 | return -EINVAL; |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 613 | |
| 614 | err = arch_bp_generic_fields(len, type, &gen_len, &gen_type); |
| 615 | if (err) |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 616 | return err; |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 617 | |
| 618 | attr = bp->attr; |
| 619 | attr.bp_len = gen_len; |
| 620 | attr.bp_type = gen_type; |
Frederic Weisbecker | 1cedae7 | 2009-12-02 07:32:16 +0100 | [diff] [blame] | 621 | attr.disabled = disabled; |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 622 | |
Frederic Weisbecker | 2f0993e | 2009-12-05 07:06:10 +0100 | [diff] [blame] | 623 | return modify_user_hw_breakpoint(bp, &attr); |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 624 | } |
| 625 | |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 626 | /* |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 627 | * Handle ptrace writes to debug register 7. |
| 628 | */ |
| 629 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) |
| 630 | { |
| 631 | struct thread_struct *thread = &(tsk->thread); |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 632 | unsigned long old_dr7; |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 633 | int i, orig_ret = 0, rc = 0; |
| 634 | int enabled, second_pass = 0; |
| 635 | unsigned len, type; |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 636 | struct perf_event *bp; |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 637 | |
| 638 | data &= ~DR_CONTROL_RESERVED; |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 639 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 640 | restore: |
| 641 | /* |
| 642 | * Loop through all the hardware breakpoints, making the |
| 643 | * appropriate changes to each. |
| 644 | */ |
| 645 | for (i = 0; i < HBP_NUM; i++) { |
| 646 | enabled = decode_dr7(data, i, &len, &type); |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 647 | bp = thread->ptrace_bps[i]; |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 648 | |
| 649 | if (!enabled) { |
| 650 | if (bp) { |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 651 | /* |
| 652 | * Don't unregister the breakpoints right-away, |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 653 | * unless all register_user_hw_breakpoint() |
| 654 | * requests have succeeded. This prevents |
| 655 | * any window of opportunity for debug |
| 656 | * register grabbing by other users. |
| 657 | */ |
| 658 | if (!second_pass) |
| 659 | continue; |
Frederic Weisbecker | 1cedae7 | 2009-12-02 07:32:16 +0100 | [diff] [blame] | 660 | |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 661 | rc = ptrace_modify_breakpoint(bp, len, type, |
Frederic Weisbecker | 1cedae7 | 2009-12-02 07:32:16 +0100 | [diff] [blame] | 662 | tsk, 1); |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 663 | if (rc) |
Frederic Weisbecker | 1cedae7 | 2009-12-02 07:32:16 +0100 | [diff] [blame] | 664 | break; |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 665 | } |
| 666 | continue; |
| 667 | } |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 668 | |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 669 | rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0); |
| 670 | if (rc) |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 671 | break; |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 672 | } |
| 673 | /* |
| 674 | * Make a second pass to free the remaining unused breakpoints |
| 675 | * or to restore the original breakpoints if an error occurred. |
| 676 | */ |
| 677 | if (!second_pass) { |
| 678 | second_pass = 1; |
| 679 | if (rc < 0) { |
| 680 | orig_ret = rc; |
| 681 | data = old_dr7; |
| 682 | } |
| 683 | goto restore; |
| 684 | } |
| 685 | return ((orig_ret < 0) ? orig_ret : rc); |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * Handle PTRACE_PEEKUSR calls for the debug register area. |
| 690 | */ |
Jaswinder Singh Rajput | 9d22b53 | 2009-07-01 19:52:30 +0530 | [diff] [blame] | 691 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 692 | { |
| 693 | struct thread_struct *thread = &(tsk->thread); |
| 694 | unsigned long val = 0; |
| 695 | |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 696 | if (n < HBP_NUM) { |
| 697 | struct perf_event *bp; |
| 698 | bp = thread->ptrace_bps[n]; |
| 699 | if (!bp) |
| 700 | return 0; |
| 701 | val = bp->hw.info.address; |
| 702 | } else if (n == 6) { |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 703 | val = thread->debugreg6; |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 704 | } else if (n == 7) { |
| 705 | val = ptrace_get_dr7(thread->ptrace_bps); |
| 706 | } |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 707 | return val; |
| 708 | } |
| 709 | |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 710 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
| 711 | unsigned long addr) |
| 712 | { |
| 713 | struct perf_event *bp; |
| 714 | struct thread_struct *t = &tsk->thread; |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 715 | struct perf_event_attr attr; |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 716 | |
| 717 | if (!t->ptrace_bps[nr]) { |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 718 | hw_breakpoint_init(&attr); |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 719 | /* |
| 720 | * Put stub len and type to register (reserve) an inactive but |
| 721 | * correct bp |
| 722 | */ |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 723 | attr.bp_addr = addr; |
| 724 | attr.bp_len = HW_BREAKPOINT_LEN_1; |
| 725 | attr.bp_type = HW_BREAKPOINT_W; |
| 726 | attr.disabled = 1; |
| 727 | |
| 728 | bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk); |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 729 | |
| 730 | /* |
| 731 | * CHECKME: the previous code returned -EIO if the addr wasn't |
| 732 | * a valid task virtual addr. The new one will return -EINVAL in |
| 733 | * this case. |
| 734 | * -EINVAL may be what we want for in-kernel breakpoints users, |
| 735 | * but -EIO looks better for ptrace, since we refuse a register |
| 736 | * writing for the user. And anyway this is the previous |
| 737 | * behaviour. |
| 738 | */ |
| 739 | if (IS_ERR(bp)) |
| 740 | return PTR_ERR(bp); |
| 741 | |
| 742 | t->ptrace_bps[nr] = bp; |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 743 | } else { |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 744 | int err; |
| 745 | |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 746 | bp = t->ptrace_bps[nr]; |
Frederic Weisbecker | 5fa10b2 | 2009-11-27 04:55:53 +0100 | [diff] [blame] | 747 | |
| 748 | attr = bp->attr; |
| 749 | attr.bp_addr = addr; |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 750 | err = modify_user_hw_breakpoint(bp, &attr); |
| 751 | if (err) |
| 752 | return err; |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 753 | } |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 754 | |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | return 0; |
| 757 | } |
| 758 | |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 759 | /* |
| 760 | * Handle PTRACE_POKEUSR calls for the debug register area. |
| 761 | */ |
| 762 | int ptrace_set_debugreg(struct task_struct *tsk, int n, unsigned long val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | { |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 764 | struct thread_struct *thread = &(tsk->thread); |
| 765 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 767 | /* There are no DR4 or DR5 registers */ |
| 768 | if (n == 4 || n == 5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | return -EIO; |
| 770 | |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 771 | if (n == 6) { |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 772 | thread->debugreg6 = val; |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 773 | goto ret_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 775 | if (n < HBP_NUM) { |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 776 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
| 777 | if (rc) |
| 778 | return rc; |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 779 | } |
| 780 | /* All that's left is DR7 */ |
| 781 | if (n == 7) |
| 782 | rc = ptrace_write_dr7(tsk, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
K.Prasad | 72f674d | 2009-06-01 23:45:48 +0530 | [diff] [blame] | 784 | ret_path: |
| 785 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
| 787 | |
Roland McGrath | 325af5f | 2008-08-08 15:58:39 -0700 | [diff] [blame] | 788 | /* |
| 789 | * These access the current or another (stopped) task's io permission |
| 790 | * bitmap for debugging or core dump. |
| 791 | */ |
| 792 | static int ioperm_active(struct task_struct *target, |
| 793 | const struct user_regset *regset) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 794 | { |
Roland McGrath | 325af5f | 2008-08-08 15:58:39 -0700 | [diff] [blame] | 795 | return target->thread.io_bitmap_max / regset->size; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 796 | } |
| 797 | |
Roland McGrath | 325af5f | 2008-08-08 15:58:39 -0700 | [diff] [blame] | 798 | static int ioperm_get(struct task_struct *target, |
| 799 | const struct user_regset *regset, |
| 800 | unsigned int pos, unsigned int count, |
| 801 | void *kbuf, void __user *ubuf) |
| 802 | { |
| 803 | if (!target->thread.io_bitmap_ptr) |
| 804 | return -ENXIO; |
| 805 | |
| 806 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 807 | target->thread.io_bitmap_ptr, |
| 808 | 0, IO_BITMAP_BYTES); |
| 809 | } |
| 810 | |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 811 | #ifdef CONFIG_X86_PTRACE_BTS |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 812 | /* |
| 813 | * A branch trace store context. |
| 814 | * |
| 815 | * Contexts may only be installed by ptrace_bts_config() and only for |
| 816 | * ptraced tasks. |
| 817 | * |
| 818 | * Contexts are destroyed when the tracee is detached from the tracer. |
| 819 | * The actual destruction work requires interrupts enabled, so the |
| 820 | * work is deferred and will be scheduled during __ptrace_unlink(). |
| 821 | * |
| 822 | * Contexts hold an additional task_struct reference on the traced |
| 823 | * task, as well as a reference on the tracer's mm. |
| 824 | * |
| 825 | * Ptrace already holds a task_struct for the duration of ptrace operations, |
| 826 | * but since destruction is deferred, it may be executed after both |
| 827 | * tracer and tracee exited. |
| 828 | */ |
| 829 | struct bts_context { |
| 830 | /* The branch trace handle. */ |
| 831 | struct bts_tracer *tracer; |
| 832 | |
| 833 | /* The buffer used to store the branch trace and its size. */ |
| 834 | void *buffer; |
| 835 | unsigned int size; |
| 836 | |
| 837 | /* The mm that paid for the above buffer. */ |
| 838 | struct mm_struct *mm; |
| 839 | |
| 840 | /* The task this context belongs to. */ |
| 841 | struct task_struct *task; |
| 842 | |
| 843 | /* The signal to send on a bts buffer overflow. */ |
| 844 | unsigned int bts_ovfl_signal; |
| 845 | |
| 846 | /* The work struct to destroy a context. */ |
| 847 | struct work_struct work; |
| 848 | }; |
| 849 | |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 850 | static int alloc_bts_buffer(struct bts_context *context, unsigned int size) |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 851 | { |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 852 | void *buffer = NULL; |
| 853 | int err = -ENOMEM; |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 854 | |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 855 | err = account_locked_memory(current->mm, current->signal->rlim, size); |
| 856 | if (err < 0) |
| 857 | return err; |
| 858 | |
| 859 | buffer = kzalloc(size, GFP_KERNEL); |
| 860 | if (!buffer) |
| 861 | goto out_refund; |
| 862 | |
| 863 | context->buffer = buffer; |
| 864 | context->size = size; |
| 865 | context->mm = get_task_mm(current); |
| 866 | |
| 867 | return 0; |
| 868 | |
| 869 | out_refund: |
| 870 | refund_locked_memory(current->mm, size); |
| 871 | return err; |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 872 | } |
| 873 | |
| 874 | static inline void free_bts_buffer(struct bts_context *context) |
| 875 | { |
| 876 | if (!context->buffer) |
| 877 | return; |
| 878 | |
| 879 | kfree(context->buffer); |
| 880 | context->buffer = NULL; |
| 881 | |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 882 | refund_locked_memory(context->mm, context->size); |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 883 | context->size = 0; |
| 884 | |
| 885 | mmput(context->mm); |
| 886 | context->mm = NULL; |
| 887 | } |
| 888 | |
| 889 | static void free_bts_context_work(struct work_struct *w) |
| 890 | { |
| 891 | struct bts_context *context; |
| 892 | |
| 893 | context = container_of(w, struct bts_context, work); |
| 894 | |
| 895 | ds_release_bts(context->tracer); |
| 896 | put_task_struct(context->task); |
| 897 | free_bts_buffer(context); |
| 898 | kfree(context); |
| 899 | } |
| 900 | |
| 901 | static inline void free_bts_context(struct bts_context *context) |
| 902 | { |
| 903 | INIT_WORK(&context->work, free_bts_context_work); |
| 904 | schedule_work(&context->work); |
| 905 | } |
| 906 | |
| 907 | static inline struct bts_context *alloc_bts_context(struct task_struct *task) |
| 908 | { |
| 909 | struct bts_context *context = kzalloc(sizeof(*context), GFP_KERNEL); |
| 910 | if (context) { |
| 911 | context->task = task; |
| 912 | task->bts = context; |
| 913 | |
| 914 | get_task_struct(task); |
| 915 | } |
| 916 | |
| 917 | return context; |
| 918 | } |
| 919 | |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 920 | static int ptrace_bts_read_record(struct task_struct *child, size_t index, |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 921 | struct bts_struct __user *out) |
| 922 | { |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 923 | struct bts_context *context; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 924 | const struct bts_trace *trace; |
| 925 | struct bts_struct bts; |
| 926 | const unsigned char *at; |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 927 | int error; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 928 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 929 | context = child->bts; |
| 930 | if (!context) |
| 931 | return -ESRCH; |
| 932 | |
| 933 | trace = ds_read_bts(context->tracer); |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 934 | if (!trace) |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 935 | return -ESRCH; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 936 | |
| 937 | at = trace->ds.top - ((index + 1) * trace->ds.size); |
| 938 | if ((void *)at < trace->ds.begin) |
| 939 | at += (trace->ds.n * trace->ds.size); |
| 940 | |
| 941 | if (!trace->read) |
| 942 | return -EOPNOTSUPP; |
| 943 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 944 | error = trace->read(context->tracer, at, &bts); |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 945 | if (error < 0) |
| 946 | return error; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 947 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 948 | if (copy_to_user(out, &bts, sizeof(bts))) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 949 | return -EFAULT; |
| 950 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 951 | return sizeof(bts); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 952 | } |
| 953 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 954 | static int ptrace_bts_drain(struct task_struct *child, |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 955 | long size, |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 956 | struct bts_struct __user *out) |
| 957 | { |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 958 | struct bts_context *context; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 959 | const struct bts_trace *trace; |
| 960 | const unsigned char *at; |
| 961 | int error, drained = 0; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 962 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 963 | context = child->bts; |
| 964 | if (!context) |
| 965 | return -ESRCH; |
| 966 | |
| 967 | trace = ds_read_bts(context->tracer); |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 968 | if (!trace) |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 969 | return -ESRCH; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 970 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 971 | if (!trace->read) |
| 972 | return -EOPNOTSUPP; |
| 973 | |
| 974 | if (size < (trace->ds.top - trace->ds.begin)) |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 975 | return -EIO; |
| 976 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 977 | for (at = trace->ds.begin; (void *)at < trace->ds.top; |
| 978 | out++, drained++, at += trace->ds.size) { |
| 979 | struct bts_struct bts; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 980 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 981 | error = trace->read(context->tracer, at, &bts); |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 982 | if (error < 0) |
| 983 | return error; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 984 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 985 | if (copy_to_user(out, &bts, sizeof(bts))) |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 986 | return -EFAULT; |
| 987 | } |
| 988 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 989 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
| 990 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 991 | error = ds_reset_bts(context->tracer); |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 992 | if (error < 0) |
| 993 | return error; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 994 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 995 | return drained; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | static int ptrace_bts_config(struct task_struct *child, |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 999 | long cfg_size, |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1000 | const struct ptrace_bts_config __user *ucfg) |
| 1001 | { |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1002 | struct bts_context *context; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1003 | struct ptrace_bts_config cfg; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1004 | unsigned int flags = 0; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1005 | |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1006 | if (cfg_size < sizeof(cfg)) |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1007 | return -EIO; |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1008 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1009 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1010 | return -EFAULT; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1011 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1012 | context = child->bts; |
| 1013 | if (!context) |
| 1014 | context = alloc_bts_context(child); |
| 1015 | if (!context) |
| 1016 | return -ENOMEM; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1017 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1018 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) { |
| 1019 | if (!cfg.signal) |
| 1020 | return -EINVAL; |
| 1021 | |
Américo Wang | 5a8ac9d | 2009-03-13 15:56:58 +0800 | [diff] [blame] | 1022 | return -EOPNOTSUPP; |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1023 | context->bts_ovfl_signal = cfg.signal; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1024 | } |
| 1025 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1026 | ds_release_bts(context->tracer); |
| 1027 | context->tracer = NULL; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1028 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1029 | if ((cfg.flags & PTRACE_BTS_O_ALLOC) && (cfg.size != context->size)) { |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 1030 | int err; |
| 1031 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1032 | free_bts_buffer(context); |
| 1033 | if (!cfg.size) |
| 1034 | return 0; |
Markus Metzger | c5dee61 | 2008-12-19 15:17:02 +0100 | [diff] [blame] | 1035 | |
Markus Metzger | 1cb81b1 | 2009-04-24 09:51:43 +0200 | [diff] [blame] | 1036 | err = alloc_bts_buffer(context, cfg.size); |
| 1037 | if (err < 0) |
| 1038 | return err; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1039 | } |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1040 | |
Markus Metzger | da35c37 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1041 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1042 | flags |= BTS_USER; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1043 | |
Markus Metzger | da35c37 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1044 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1045 | flags |= BTS_TIMESTAMPS; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1046 | |
Markus Metzger | de79f54 | 2009-04-03 16:43:40 +0200 | [diff] [blame] | 1047 | context->tracer = |
| 1048 | ds_request_bts_task(child, context->buffer, context->size, |
| 1049 | NULL, (size_t)-1, flags); |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1050 | if (unlikely(IS_ERR(context->tracer))) { |
| 1051 | int error = PTR_ERR(context->tracer); |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1052 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1053 | free_bts_buffer(context); |
| 1054 | context->tracer = NULL; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1055 | return error; |
| 1056 | } |
Markus Metzger | da35c37 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1057 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1058 | return sizeof(cfg); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1059 | } |
| 1060 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1061 | static int ptrace_bts_status(struct task_struct *child, |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1062 | long cfg_size, |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1063 | struct ptrace_bts_config __user *ucfg) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1064 | { |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1065 | struct bts_context *context; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1066 | const struct bts_trace *trace; |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1067 | struct ptrace_bts_config cfg; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1068 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1069 | context = child->bts; |
| 1070 | if (!context) |
| 1071 | return -ESRCH; |
| 1072 | |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1073 | if (cfg_size < sizeof(cfg)) |
| 1074 | return -EIO; |
| 1075 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1076 | trace = ds_read_bts(context->tracer); |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1077 | if (!trace) |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1078 | return -ESRCH; |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1079 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1080 | memset(&cfg, 0, sizeof(cfg)); |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1081 | cfg.size = trace->ds.end - trace->ds.begin; |
| 1082 | cfg.signal = context->bts_ovfl_signal; |
| 1083 | cfg.bts_size = sizeof(struct bts_struct); |
Markus Metzger | 87e8407 | 2008-01-30 13:32:54 +0100 | [diff] [blame] | 1084 | |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1085 | if (cfg.signal) |
| 1086 | cfg.flags |= PTRACE_BTS_O_SIGNAL; |
| 1087 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1088 | if (trace->ds.flags & BTS_USER) |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1089 | cfg.flags |= PTRACE_BTS_O_TRACE; |
| 1090 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1091 | if (trace->ds.flags & BTS_TIMESTAMPS) |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1092 | cfg.flags |= PTRACE_BTS_O_SCHED; |
| 1093 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1094 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
| 1095 | return -EFAULT; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1096 | |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1097 | return sizeof(cfg); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1098 | } |
| 1099 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1100 | static int ptrace_bts_clear(struct task_struct *child) |
Andrew Morton | d8d4f15 | 2008-03-04 15:05:39 -0800 | [diff] [blame] | 1101 | { |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1102 | struct bts_context *context; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1103 | const struct bts_trace *trace; |
Andrew Morton | d8d4f15 | 2008-03-04 15:05:39 -0800 | [diff] [blame] | 1104 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1105 | context = child->bts; |
| 1106 | if (!context) |
| 1107 | return -ESRCH; |
| 1108 | |
| 1109 | trace = ds_read_bts(context->tracer); |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1110 | if (!trace) |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1111 | return -ESRCH; |
Andrew Morton | d8d4f15 | 2008-03-04 15:05:39 -0800 | [diff] [blame] | 1112 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1113 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
Andrew Morton | d8d4f15 | 2008-03-04 15:05:39 -0800 | [diff] [blame] | 1114 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1115 | return ds_reset_bts(context->tracer); |
Andrew Morton | d8d4f15 | 2008-03-04 15:05:39 -0800 | [diff] [blame] | 1116 | } |
| 1117 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1118 | static int ptrace_bts_size(struct task_struct *child) |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1119 | { |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1120 | struct bts_context *context; |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1121 | const struct bts_trace *trace; |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1122 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1123 | context = child->bts; |
| 1124 | if (!context) |
| 1125 | return -ESRCH; |
| 1126 | |
| 1127 | trace = ds_read_bts(context->tracer); |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1128 | if (!trace) |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1129 | return -ESRCH; |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1130 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1131 | return (trace->ds.top - trace->ds.begin) / trace->ds.size; |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1132 | } |
Markus Metzger | bf53de9 | 2008-12-19 15:10:24 +0100 | [diff] [blame] | 1133 | |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1134 | /* |
| 1135 | * Called from __ptrace_unlink() after the child has been moved back |
| 1136 | * to its original parent. |
| 1137 | */ |
Markus Metzger | 0f48140 | 2009-04-03 16:43:48 +0200 | [diff] [blame] | 1138 | void ptrace_bts_untrace(struct task_struct *child) |
Markus Metzger | bf53de9 | 2008-12-19 15:10:24 +0100 | [diff] [blame] | 1139 | { |
| 1140 | if (unlikely(child->bts)) { |
Markus Metzger | e2b371f | 2009-04-03 16:43:35 +0200 | [diff] [blame] | 1141 | free_bts_context(child->bts); |
Markus Metzger | bf53de9 | 2008-12-19 15:10:24 +0100 | [diff] [blame] | 1142 | child->bts = NULL; |
Markus Metzger | bf53de9 | 2008-12-19 15:10:24 +0100 | [diff] [blame] | 1143 | } |
| 1144 | } |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1145 | #endif /* CONFIG_X86_PTRACE_BTS */ |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | /* |
| 1148 | * Called by kernel/ptrace.c when detaching.. |
| 1149 | * |
| 1150 | * Make sure the single step bit is not set. |
| 1151 | */ |
| 1152 | void ptrace_disable(struct task_struct *child) |
| 1153 | { |
| 1154 | user_disable_single_step(child); |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1155 | #ifdef TIF_SYSCALL_EMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1157 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | } |
| 1159 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1160 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 1161 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ |
| 1162 | #endif |
| 1163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
| 1165 | { |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1166 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | unsigned long __user *datap = (unsigned long __user *)data; |
| 1168 | |
| 1169 | switch (request) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | /* read the word at location addr in the USER area. */ |
| 1171 | case PTRACE_PEEKUSR: { |
| 1172 | unsigned long tmp; |
| 1173 | |
| 1174 | ret = -EIO; |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1175 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
| 1176 | addr >= sizeof(struct user)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | break; |
| 1178 | |
| 1179 | tmp = 0; /* Default return condition */ |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1180 | if (addr < sizeof(struct user_regs_struct)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | tmp = getreg(child, addr); |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1182 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| 1183 | addr <= offsetof(struct user, u_debugreg[7])) { |
| 1184 | addr -= offsetof(struct user, u_debugreg[0]); |
| 1185 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | } |
| 1187 | ret = put_user(tmp, datap); |
| 1188 | break; |
| 1189 | } |
| 1190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
| 1192 | ret = -EIO; |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1193 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
| 1194 | addr >= sizeof(struct user)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | break; |
| 1196 | |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1197 | if (addr < sizeof(struct user_regs_struct)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | ret = putreg(child, addr, data); |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1199 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| 1200 | addr <= offsetof(struct user, u_debugreg[7])) { |
| 1201 | addr -= offsetof(struct user, u_debugreg[0]); |
| 1202 | ret = ptrace_set_debugreg(child, |
| 1203 | addr / sizeof(data), data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | } |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1205 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1207 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
| 1208 | return copy_regset_to_user(child, |
| 1209 | task_user_regset_view(current), |
| 1210 | REGSET_GENERAL, |
| 1211 | 0, sizeof(struct user_regs_struct), |
| 1212 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1214 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| 1215 | return copy_regset_from_user(child, |
| 1216 | task_user_regset_view(current), |
| 1217 | REGSET_GENERAL, |
| 1218 | 0, sizeof(struct user_regs_struct), |
| 1219 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1221 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
| 1222 | return copy_regset_to_user(child, |
| 1223 | task_user_regset_view(current), |
| 1224 | REGSET_FP, |
| 1225 | 0, sizeof(struct user_i387_struct), |
| 1226 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1228 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
| 1229 | return copy_regset_from_user(child, |
| 1230 | task_user_regset_view(current), |
| 1231 | REGSET_FP, |
| 1232 | 0, sizeof(struct user_i387_struct), |
| 1233 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1235 | #ifdef CONFIG_X86_32 |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1236 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
| 1237 | return copy_regset_to_user(child, &user_x86_32_view, |
| 1238 | REGSET_XFP, |
| 1239 | 0, sizeof(struct user_fxsr_struct), |
Roland McGrath | 45fdc3a | 2008-06-30 14:02:41 -0700 | [diff] [blame] | 1240 | datap) ? -EIO : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1242 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
| 1243 | return copy_regset_from_user(child, &user_x86_32_view, |
| 1244 | REGSET_XFP, |
| 1245 | 0, sizeof(struct user_fxsr_struct), |
Roland McGrath | 45fdc3a | 2008-06-30 14:02:41 -0700 | [diff] [blame] | 1246 | datap) ? -EIO : 0; |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1247 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1249 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | case PTRACE_GET_THREAD_AREA: |
Roland McGrath | efd1ca5 | 2008-01-30 13:30:46 +0100 | [diff] [blame] | 1251 | if (addr < 0) |
| 1252 | return -EIO; |
| 1253 | ret = do_get_thread_area(child, addr, |
| 1254 | (struct user_desc __user *) data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | break; |
| 1256 | |
| 1257 | case PTRACE_SET_THREAD_AREA: |
Roland McGrath | efd1ca5 | 2008-01-30 13:30:46 +0100 | [diff] [blame] | 1258 | if (addr < 0) |
| 1259 | return -EIO; |
| 1260 | ret = do_set_thread_area(child, addr, |
| 1261 | (struct user_desc __user *) data, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | break; |
Roland McGrath | e9c86c7 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1263 | #endif |
| 1264 | |
| 1265 | #ifdef CONFIG_X86_64 |
| 1266 | /* normal 64bit interface to access TLS data. |
| 1267 | Works just like arch_prctl, except that the arguments |
| 1268 | are reversed. */ |
| 1269 | case PTRACE_ARCH_PRCTL: |
| 1270 | ret = do_arch_prctl(child, data, addr); |
| 1271 | break; |
| 1272 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
Ingo Molnar | b4ef95d | 2008-02-26 09:40:27 +0100 | [diff] [blame] | 1274 | /* |
| 1275 | * These bits need more cooking - not enabled yet: |
| 1276 | */ |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1277 | #ifdef CONFIG_X86_PTRACE_BTS |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1278 | case PTRACE_BTS_CONFIG: |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1279 | ret = ptrace_bts_config |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1280 | (child, data, (struct ptrace_bts_config __user *)addr); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1281 | break; |
| 1282 | |
| 1283 | case PTRACE_BTS_STATUS: |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1284 | ret = ptrace_bts_status |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1285 | (child, data, (struct ptrace_bts_config __user *)addr); |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1286 | break; |
| 1287 | |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1288 | case PTRACE_BTS_SIZE: |
| 1289 | ret = ptrace_bts_size(child); |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1290 | break; |
| 1291 | |
| 1292 | case PTRACE_BTS_GET: |
| 1293 | ret = ptrace_bts_read_record |
| 1294 | (child, data, (struct bts_struct __user *) addr); |
| 1295 | break; |
| 1296 | |
| 1297 | case PTRACE_BTS_CLEAR: |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1298 | ret = ptrace_bts_clear(child); |
Markus Metzger | a95d67f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 1299 | break; |
| 1300 | |
| 1301 | case PTRACE_BTS_DRAIN: |
| 1302 | ret = ptrace_bts_drain |
Markus Metzger | cba4b65 | 2008-01-30 13:32:03 +0100 | [diff] [blame] | 1303 | (child, data, (struct bts_struct __user *) addr); |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1304 | break; |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 1305 | #endif /* CONFIG_X86_PTRACE_BTS */ |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 1306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | default: |
| 1308 | ret = ptrace_request(child, request, addr, data); |
| 1309 | break; |
| 1310 | } |
Roland McGrath | d9771e8 | 2008-01-30 13:30:52 +0100 | [diff] [blame] | 1311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | return ret; |
| 1313 | } |
| 1314 | |
Roland McGrath | cb757c4 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1315 | #ifdef CONFIG_IA32_EMULATION |
| 1316 | |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1317 | #include <linux/compat.h> |
| 1318 | #include <linux/syscalls.h> |
| 1319 | #include <asm/ia32.h> |
Roland McGrath | cb757c4 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1320 | #include <asm/user32.h> |
| 1321 | |
| 1322 | #define R32(l,q) \ |
| 1323 | case offsetof(struct user32, regs.l): \ |
| 1324 | regs->q = value; break |
| 1325 | |
| 1326 | #define SEG32(rs) \ |
| 1327 | case offsetof(struct user32, regs.rs): \ |
| 1328 | return set_segment_reg(child, \ |
| 1329 | offsetof(struct user_regs_struct, rs), \ |
| 1330 | value); \ |
| 1331 | break |
| 1332 | |
| 1333 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) |
| 1334 | { |
| 1335 | struct pt_regs *regs = task_pt_regs(child); |
| 1336 | |
| 1337 | switch (regno) { |
| 1338 | |
| 1339 | SEG32(cs); |
| 1340 | SEG32(ds); |
| 1341 | SEG32(es); |
| 1342 | SEG32(fs); |
| 1343 | SEG32(gs); |
| 1344 | SEG32(ss); |
| 1345 | |
| 1346 | R32(ebx, bx); |
| 1347 | R32(ecx, cx); |
| 1348 | R32(edx, dx); |
| 1349 | R32(edi, di); |
| 1350 | R32(esi, si); |
| 1351 | R32(ebp, bp); |
| 1352 | R32(eax, ax); |
Roland McGrath | cb757c4 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1353 | R32(eip, ip); |
| 1354 | R32(esp, sp); |
| 1355 | |
Roland McGrath | 40f0933 | 2008-02-28 19:57:07 -0800 | [diff] [blame] | 1356 | case offsetof(struct user32, regs.orig_eax): |
| 1357 | /* |
Roland McGrath | 8cb3ed13 | 2009-09-22 20:12:07 -0700 | [diff] [blame] | 1358 | * A 32-bit debugger setting orig_eax means to restore |
| 1359 | * the state of the task restarting a 32-bit syscall. |
| 1360 | * Make sure we interpret the -ERESTART* codes correctly |
| 1361 | * in case the task is not actually still sitting at the |
| 1362 | * exit from a 32-bit syscall with TS_COMPAT still set. |
Roland McGrath | 40f0933 | 2008-02-28 19:57:07 -0800 | [diff] [blame] | 1363 | */ |
Roland McGrath | 8cb3ed13 | 2009-09-22 20:12:07 -0700 | [diff] [blame] | 1364 | regs->orig_ax = value; |
| 1365 | if (syscall_get_nr(child, regs) >= 0) |
| 1366 | task_thread_info(child)->status |= TS_COMPAT; |
Roland McGrath | 40f0933 | 2008-02-28 19:57:07 -0800 | [diff] [blame] | 1367 | break; |
| 1368 | |
Roland McGrath | cb757c4 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1369 | case offsetof(struct user32, regs.eflags): |
| 1370 | return set_flags(child, value); |
| 1371 | |
| 1372 | case offsetof(struct user32, u_debugreg[0]) ... |
| 1373 | offsetof(struct user32, u_debugreg[7]): |
| 1374 | regno -= offsetof(struct user32, u_debugreg[0]); |
| 1375 | return ptrace_set_debugreg(child, regno / 4, value); |
| 1376 | |
| 1377 | default: |
| 1378 | if (regno > sizeof(struct user32) || (regno & 3)) |
| 1379 | return -EIO; |
| 1380 | |
| 1381 | /* |
| 1382 | * Other dummy fields in the virtual user structure |
| 1383 | * are ignored |
| 1384 | */ |
| 1385 | break; |
| 1386 | } |
| 1387 | return 0; |
| 1388 | } |
| 1389 | |
| 1390 | #undef R32 |
| 1391 | #undef SEG32 |
| 1392 | |
| 1393 | #define R32(l,q) \ |
| 1394 | case offsetof(struct user32, regs.l): \ |
| 1395 | *val = regs->q; break |
| 1396 | |
| 1397 | #define SEG32(rs) \ |
| 1398 | case offsetof(struct user32, regs.rs): \ |
| 1399 | *val = get_segment_reg(child, \ |
| 1400 | offsetof(struct user_regs_struct, rs)); \ |
| 1401 | break |
| 1402 | |
| 1403 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) |
| 1404 | { |
| 1405 | struct pt_regs *regs = task_pt_regs(child); |
| 1406 | |
| 1407 | switch (regno) { |
| 1408 | |
| 1409 | SEG32(ds); |
| 1410 | SEG32(es); |
| 1411 | SEG32(fs); |
| 1412 | SEG32(gs); |
| 1413 | |
| 1414 | R32(cs, cs); |
| 1415 | R32(ss, ss); |
| 1416 | R32(ebx, bx); |
| 1417 | R32(ecx, cx); |
| 1418 | R32(edx, dx); |
| 1419 | R32(edi, di); |
| 1420 | R32(esi, si); |
| 1421 | R32(ebp, bp); |
| 1422 | R32(eax, ax); |
| 1423 | R32(orig_eax, orig_ax); |
| 1424 | R32(eip, ip); |
| 1425 | R32(esp, sp); |
| 1426 | |
| 1427 | case offsetof(struct user32, regs.eflags): |
| 1428 | *val = get_flags(child); |
| 1429 | break; |
| 1430 | |
| 1431 | case offsetof(struct user32, u_debugreg[0]) ... |
| 1432 | offsetof(struct user32, u_debugreg[7]): |
| 1433 | regno -= offsetof(struct user32, u_debugreg[0]); |
| 1434 | *val = ptrace_get_debugreg(child, regno / 4); |
| 1435 | break; |
| 1436 | |
| 1437 | default: |
| 1438 | if (regno > sizeof(struct user32) || (regno & 3)) |
| 1439 | return -EIO; |
| 1440 | |
| 1441 | /* |
| 1442 | * Other dummy fields in the virtual user structure |
| 1443 | * are ignored |
| 1444 | */ |
| 1445 | *val = 0; |
| 1446 | break; |
| 1447 | } |
| 1448 | return 0; |
| 1449 | } |
| 1450 | |
| 1451 | #undef R32 |
| 1452 | #undef SEG32 |
| 1453 | |
Roland McGrath | 91e7b70 | 2008-01-30 13:31:52 +0100 | [diff] [blame] | 1454 | static int genregs32_get(struct task_struct *target, |
| 1455 | const struct user_regset *regset, |
| 1456 | unsigned int pos, unsigned int count, |
| 1457 | void *kbuf, void __user *ubuf) |
| 1458 | { |
| 1459 | if (kbuf) { |
| 1460 | compat_ulong_t *k = kbuf; |
| 1461 | while (count > 0) { |
| 1462 | getreg32(target, pos, k++); |
| 1463 | count -= sizeof(*k); |
| 1464 | pos += sizeof(*k); |
| 1465 | } |
| 1466 | } else { |
| 1467 | compat_ulong_t __user *u = ubuf; |
| 1468 | while (count > 0) { |
| 1469 | compat_ulong_t word; |
| 1470 | getreg32(target, pos, &word); |
| 1471 | if (__put_user(word, u++)) |
| 1472 | return -EFAULT; |
| 1473 | count -= sizeof(*u); |
| 1474 | pos += sizeof(*u); |
| 1475 | } |
| 1476 | } |
| 1477 | |
| 1478 | return 0; |
| 1479 | } |
| 1480 | |
| 1481 | static int genregs32_set(struct task_struct *target, |
| 1482 | const struct user_regset *regset, |
| 1483 | unsigned int pos, unsigned int count, |
| 1484 | const void *kbuf, const void __user *ubuf) |
| 1485 | { |
| 1486 | int ret = 0; |
| 1487 | if (kbuf) { |
| 1488 | const compat_ulong_t *k = kbuf; |
| 1489 | while (count > 0 && !ret) { |
Roland McGrath | f9cb02b | 2008-02-21 20:37:24 -0800 | [diff] [blame] | 1490 | ret = putreg32(target, pos, *k++); |
Roland McGrath | 91e7b70 | 2008-01-30 13:31:52 +0100 | [diff] [blame] | 1491 | count -= sizeof(*k); |
| 1492 | pos += sizeof(*k); |
| 1493 | } |
| 1494 | } else { |
| 1495 | const compat_ulong_t __user *u = ubuf; |
| 1496 | while (count > 0 && !ret) { |
| 1497 | compat_ulong_t word; |
| 1498 | ret = __get_user(word, u++); |
| 1499 | if (ret) |
| 1500 | break; |
Roland McGrath | f9cb02b | 2008-02-21 20:37:24 -0800 | [diff] [blame] | 1501 | ret = putreg32(target, pos, word); |
Roland McGrath | 91e7b70 | 2008-01-30 13:31:52 +0100 | [diff] [blame] | 1502 | count -= sizeof(*u); |
| 1503 | pos += sizeof(*u); |
| 1504 | } |
| 1505 | } |
| 1506 | return ret; |
| 1507 | } |
| 1508 | |
Roland McGrath | 562b80b | 2008-04-22 12:21:25 -0700 | [diff] [blame] | 1509 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
| 1510 | compat_ulong_t caddr, compat_ulong_t cdata) |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1511 | { |
Roland McGrath | 562b80b | 2008-04-22 12:21:25 -0700 | [diff] [blame] | 1512 | unsigned long addr = caddr; |
| 1513 | unsigned long data = cdata; |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1514 | void __user *datap = compat_ptr(data); |
| 1515 | int ret; |
| 1516 | __u32 val; |
| 1517 | |
| 1518 | switch (request) { |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1519 | case PTRACE_PEEKUSR: |
| 1520 | ret = getreg32(child, addr, &val); |
| 1521 | if (ret == 0) |
| 1522 | ret = put_user(val, (__u32 __user *)datap); |
| 1523 | break; |
| 1524 | |
| 1525 | case PTRACE_POKEUSR: |
| 1526 | ret = putreg32(child, addr, data); |
| 1527 | break; |
| 1528 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1529 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
| 1530 | return copy_regset_to_user(child, &user_x86_32_view, |
| 1531 | REGSET_GENERAL, |
| 1532 | 0, sizeof(struct user_regs_struct32), |
| 1533 | datap); |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1534 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1535 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| 1536 | return copy_regset_from_user(child, &user_x86_32_view, |
| 1537 | REGSET_GENERAL, 0, |
| 1538 | sizeof(struct user_regs_struct32), |
| 1539 | datap); |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1540 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1541 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
| 1542 | return copy_regset_to_user(child, &user_x86_32_view, |
| 1543 | REGSET_FP, 0, |
| 1544 | sizeof(struct user_i387_ia32_struct), |
| 1545 | datap); |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1546 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1547 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
| 1548 | return copy_regset_from_user( |
| 1549 | child, &user_x86_32_view, REGSET_FP, |
| 1550 | 0, sizeof(struct user_i387_ia32_struct), datap); |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1551 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1552 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
| 1553 | return copy_regset_to_user(child, &user_x86_32_view, |
| 1554 | REGSET_XFP, 0, |
| 1555 | sizeof(struct user32_fxsr_struct), |
| 1556 | datap); |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1557 | |
Roland McGrath | 5a4646a | 2008-01-30 13:31:54 +0100 | [diff] [blame] | 1558 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
| 1559 | return copy_regset_from_user(child, &user_x86_32_view, |
| 1560 | REGSET_XFP, 0, |
| 1561 | sizeof(struct user32_fxsr_struct), |
| 1562 | datap); |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1563 | |
Roland McGrath | 562b80b | 2008-04-22 12:21:25 -0700 | [diff] [blame] | 1564 | case PTRACE_GET_THREAD_AREA: |
| 1565 | case PTRACE_SET_THREAD_AREA: |
Markus Metzger | c272477 | 2008-12-11 13:49:59 +0100 | [diff] [blame] | 1566 | #ifdef CONFIG_X86_PTRACE_BTS |
| 1567 | case PTRACE_BTS_CONFIG: |
| 1568 | case PTRACE_BTS_STATUS: |
| 1569 | case PTRACE_BTS_SIZE: |
| 1570 | case PTRACE_BTS_GET: |
| 1571 | case PTRACE_BTS_CLEAR: |
| 1572 | case PTRACE_BTS_DRAIN: |
| 1573 | #endif /* CONFIG_X86_PTRACE_BTS */ |
Roland McGrath | 562b80b | 2008-04-22 12:21:25 -0700 | [diff] [blame] | 1574 | return arch_ptrace(child, request, addr, data); |
| 1575 | |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1576 | default: |
Roland McGrath | fdadd54 | 2008-01-30 13:31:56 +0100 | [diff] [blame] | 1577 | return compat_ptrace_request(child, request, addr, data); |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1578 | } |
| 1579 | |
Roland McGrath | 099cd6e | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1580 | return ret; |
| 1581 | } |
| 1582 | |
Roland McGrath | cb757c4 | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1583 | #endif /* CONFIG_IA32_EMULATION */ |
| 1584 | |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 1585 | #ifdef CONFIG_X86_64 |
| 1586 | |
| 1587 | static const struct user_regset x86_64_regsets[] = { |
| 1588 | [REGSET_GENERAL] = { |
| 1589 | .core_note_type = NT_PRSTATUS, |
| 1590 | .n = sizeof(struct user_regs_struct) / sizeof(long), |
| 1591 | .size = sizeof(long), .align = sizeof(long), |
| 1592 | .get = genregs_get, .set = genregs_set |
| 1593 | }, |
| 1594 | [REGSET_FP] = { |
| 1595 | .core_note_type = NT_PRFPREG, |
| 1596 | .n = sizeof(struct user_i387_struct) / sizeof(long), |
| 1597 | .size = sizeof(long), .align = sizeof(long), |
| 1598 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set |
| 1599 | }, |
Roland McGrath | 325af5f | 2008-08-08 15:58:39 -0700 | [diff] [blame] | 1600 | [REGSET_IOPERM64] = { |
| 1601 | .core_note_type = NT_386_IOPERM, |
| 1602 | .n = IO_BITMAP_LONGS, |
| 1603 | .size = sizeof(long), .align = sizeof(long), |
| 1604 | .active = ioperm_active, .get = ioperm_get |
| 1605 | }, |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 1606 | }; |
| 1607 | |
| 1608 | static const struct user_regset_view user_x86_64_view = { |
| 1609 | .name = "x86_64", .e_machine = EM_X86_64, |
| 1610 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) |
| 1611 | }; |
| 1612 | |
| 1613 | #else /* CONFIG_X86_32 */ |
| 1614 | |
| 1615 | #define user_regs_struct32 user_regs_struct |
| 1616 | #define genregs32_get genregs_get |
| 1617 | #define genregs32_set genregs_set |
| 1618 | |
Roland McGrath | 1f465f4 | 2008-05-09 15:43:44 -0700 | [diff] [blame] | 1619 | #define user_i387_ia32_struct user_i387_struct |
| 1620 | #define user32_fxsr_struct user_fxsr_struct |
| 1621 | |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 1622 | #endif /* CONFIG_X86_64 */ |
| 1623 | |
| 1624 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 1625 | static const struct user_regset x86_32_regsets[] = { |
| 1626 | [REGSET_GENERAL] = { |
| 1627 | .core_note_type = NT_PRSTATUS, |
| 1628 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), |
| 1629 | .size = sizeof(u32), .align = sizeof(u32), |
| 1630 | .get = genregs32_get, .set = genregs32_set |
| 1631 | }, |
| 1632 | [REGSET_FP] = { |
| 1633 | .core_note_type = NT_PRFPREG, |
Roland McGrath | 1f465f4 | 2008-05-09 15:43:44 -0700 | [diff] [blame] | 1634 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 1635 | .size = sizeof(u32), .align = sizeof(u32), |
| 1636 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set |
| 1637 | }, |
| 1638 | [REGSET_XFP] = { |
| 1639 | .core_note_type = NT_PRXFPREG, |
Roland McGrath | 1f465f4 | 2008-05-09 15:43:44 -0700 | [diff] [blame] | 1640 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 1641 | .size = sizeof(u32), .align = sizeof(u32), |
| 1642 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set |
| 1643 | }, |
| 1644 | [REGSET_TLS] = { |
Roland McGrath | bb61682 | 2008-01-30 13:31:56 +0100 | [diff] [blame] | 1645 | .core_note_type = NT_386_TLS, |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 1646 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
| 1647 | .size = sizeof(struct user_desc), |
| 1648 | .align = sizeof(struct user_desc), |
| 1649 | .active = regset_tls_active, |
| 1650 | .get = regset_tls_get, .set = regset_tls_set |
| 1651 | }, |
Roland McGrath | 325af5f | 2008-08-08 15:58:39 -0700 | [diff] [blame] | 1652 | [REGSET_IOPERM32] = { |
| 1653 | .core_note_type = NT_386_IOPERM, |
| 1654 | .n = IO_BITMAP_BYTES / sizeof(u32), |
| 1655 | .size = sizeof(u32), .align = sizeof(u32), |
| 1656 | .active = ioperm_active, .get = ioperm_get |
| 1657 | }, |
Roland McGrath | 070459d | 2008-01-30 13:31:53 +0100 | [diff] [blame] | 1658 | }; |
| 1659 | |
| 1660 | static const struct user_regset_view user_x86_32_view = { |
| 1661 | .name = "i386", .e_machine = EM_386, |
| 1662 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) |
| 1663 | }; |
| 1664 | #endif |
| 1665 | |
| 1666 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| 1667 | { |
| 1668 | #ifdef CONFIG_IA32_EMULATION |
| 1669 | if (test_tsk_thread_flag(task, TIF_IA32)) |
| 1670 | #endif |
| 1671 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 1672 | return &user_x86_32_view; |
| 1673 | #endif |
| 1674 | #ifdef CONFIG_X86_64 |
| 1675 | return &user_x86_64_view; |
| 1676 | #endif |
| 1677 | } |
| 1678 | |
Oleg Nesterov | 7f38551 | 2009-12-15 16:47:20 -0800 | [diff] [blame] | 1679 | static void fill_sigtrap_info(struct task_struct *tsk, |
| 1680 | struct pt_regs *regs, |
| 1681 | int error_code, int si_code, |
| 1682 | struct siginfo *info) |
| 1683 | { |
| 1684 | tsk->thread.trap_no = 1; |
| 1685 | tsk->thread.error_code = error_code; |
| 1686 | |
| 1687 | memset(info, 0, sizeof(*info)); |
| 1688 | info->si_signo = SIGTRAP; |
| 1689 | info->si_code = si_code; |
| 1690 | info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL; |
| 1691 | } |
| 1692 | |
| 1693 | void user_single_step_siginfo(struct task_struct *tsk, |
| 1694 | struct pt_regs *regs, |
| 1695 | struct siginfo *info) |
| 1696 | { |
| 1697 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); |
| 1698 | } |
| 1699 | |
Srinivasa Ds | da654b7 | 2008-09-23 15:23:52 +0530 | [diff] [blame] | 1700 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
| 1701 | int error_code, int si_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | { |
| 1703 | struct siginfo info; |
| 1704 | |
Oleg Nesterov | 7f38551 | 2009-12-15 16:47:20 -0800 | [diff] [blame] | 1705 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
Simon Arlott | 27b46d7 | 2007-10-20 01:13:56 +0200 | [diff] [blame] | 1706 | /* Send us the fake SIGTRAP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | force_sig_info(SIGTRAP, &info, tsk); |
| 1708 | } |
| 1709 | |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1710 | |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1711 | #ifdef CONFIG_X86_32 |
| 1712 | # define IS_IA32 1 |
| 1713 | #elif defined CONFIG_IA32_EMULATION |
Roland McGrath | ccbe495 | 2009-02-27 19:03:24 -0800 | [diff] [blame] | 1714 | # define IS_IA32 is_compat_task() |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1715 | #else |
| 1716 | # define IS_IA32 0 |
| 1717 | #endif |
| 1718 | |
| 1719 | /* |
| 1720 | * We must return the syscall number to actually look up in the table. |
| 1721 | * This can be -1L to skip running any syscall at all. |
| 1722 | */ |
| 1723 | asmregparm long syscall_trace_enter(struct pt_regs *regs) |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1724 | { |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1725 | long ret = 0; |
| 1726 | |
Roland McGrath | 380fdd7 | 2008-07-09 02:39:29 -0700 | [diff] [blame] | 1727 | /* |
| 1728 | * If we stepped into a sysenter/syscall insn, it trapped in |
| 1729 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. |
| 1730 | * If user-mode had set TF itself, then it's still clear from |
| 1731 | * do_debug() and we need to set it again to restore the user |
| 1732 | * state. If we entered on the slow path, TF was already set. |
| 1733 | */ |
| 1734 | if (test_thread_flag(TIF_SINGLESTEP)) |
| 1735 | regs->flags |= X86_EFLAGS_TF; |
| 1736 | |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1737 | /* do the secure computing check first */ |
| 1738 | secure_computing(regs->orig_ax); |
| 1739 | |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1740 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
| 1741 | ret = -1L; |
| 1742 | |
Roland McGrath | eeea3c3 | 2008-03-16 23:36:28 -0700 | [diff] [blame] | 1743 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
| 1744 | tracehook_report_syscall_entry(regs)) |
| 1745 | ret = -1L; |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1746 | |
Josh Stone | 6670000 | 2009-08-24 14:43:11 -0700 | [diff] [blame] | 1747 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
Josh Stone | 1c569f0 | 2009-08-24 14:43:14 -0700 | [diff] [blame] | 1748 | trace_sys_enter(regs, regs->orig_ax); |
Frederic Weisbecker | 1b3fa2c | 2009-03-07 05:53:00 +0100 | [diff] [blame] | 1749 | |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1750 | if (unlikely(current->audit_context)) { |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1751 | if (IS_IA32) |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1752 | audit_syscall_entry(AUDIT_ARCH_I386, |
| 1753 | regs->orig_ax, |
| 1754 | regs->bx, regs->cx, |
| 1755 | regs->dx, regs->si); |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1756 | #ifdef CONFIG_X86_64 |
| 1757 | else |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1758 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
| 1759 | regs->orig_ax, |
| 1760 | regs->di, regs->si, |
| 1761 | regs->dx, regs->r10); |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1762 | #endif |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1763 | } |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1764 | |
| 1765 | return ret ?: regs->orig_ax; |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1766 | } |
| 1767 | |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1768 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1769 | { |
Oleg Nesterov | d519650 | 2009-12-15 16:47:21 -0800 | [diff] [blame] | 1770 | bool step; |
| 1771 | |
Roland McGrath | 86976cd | 2008-01-30 13:31:01 +0100 | [diff] [blame] | 1772 | if (unlikely(current->audit_context)) |
| 1773 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); |
| 1774 | |
Josh Stone | 6670000 | 2009-08-24 14:43:11 -0700 | [diff] [blame] | 1775 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
Josh Stone | 1c569f0 | 2009-08-24 14:43:14 -0700 | [diff] [blame] | 1776 | trace_sys_exit(regs, regs->ax); |
Frederic Weisbecker | 1b3fa2c | 2009-03-07 05:53:00 +0100 | [diff] [blame] | 1777 | |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1778 | /* |
| 1779 | * If TIF_SYSCALL_EMU is set, we only get here because of |
| 1780 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). |
| 1781 | * We already reported this syscall instruction in |
Oleg Nesterov | d519650 | 2009-12-15 16:47:21 -0800 | [diff] [blame] | 1782 | * syscall_trace_enter(). |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1783 | */ |
Oleg Nesterov | d519650 | 2009-12-15 16:47:21 -0800 | [diff] [blame] | 1784 | step = unlikely(test_thread_flag(TIF_SINGLESTEP)) && |
| 1785 | !test_thread_flag(TIF_SYSCALL_EMU); |
| 1786 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) |
| 1787 | tracehook_report_syscall_exit(regs, step); |
Roland McGrath | d4d6715 | 2008-07-09 02:38:07 -0700 | [diff] [blame] | 1788 | } |