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1da177e4 LT |
1 | #ifndef _LINUX_PTRACE_H |
2 | #define _LINUX_PTRACE_H | |
3 | /* ptrace.h */ | |
4 | /* structs and defines to help the user use the ptrace system call. */ | |
5 | ||
6 | /* has the defines to get at the registers. */ | |
7 | ||
8 | #define PTRACE_TRACEME 0 | |
9 | #define PTRACE_PEEKTEXT 1 | |
10 | #define PTRACE_PEEKDATA 2 | |
11 | #define PTRACE_PEEKUSR 3 | |
12 | #define PTRACE_POKETEXT 4 | |
13 | #define PTRACE_POKEDATA 5 | |
14 | #define PTRACE_POKEUSR 6 | |
15 | #define PTRACE_CONT 7 | |
16 | #define PTRACE_KILL 8 | |
17 | #define PTRACE_SINGLESTEP 9 | |
18 | ||
416bc512 RM |
19 | #define PTRACE_ATTACH 16 |
20 | #define PTRACE_DETACH 17 | |
1da177e4 LT |
21 | |
22 | #define PTRACE_SYSCALL 24 | |
23 | ||
24 | /* 0x4200-0x4300 are reserved for architecture-independent additions. */ | |
25 | #define PTRACE_SETOPTIONS 0x4200 | |
26 | #define PTRACE_GETEVENTMSG 0x4201 | |
27 | #define PTRACE_GETSIGINFO 0x4202 | |
28 | #define PTRACE_SETSIGINFO 0x4203 | |
29 | ||
2225a122 SS |
30 | /* |
31 | * Generic ptrace interface that exports the architecture specific regsets | |
32 | * using the corresponding NT_* types (which are also used in the core dump). | |
c6a0dd7e SS |
33 | * Please note that the NT_PRSTATUS note type in a core dump contains a full |
34 | * 'struct elf_prstatus'. But the user_regset for NT_PRSTATUS contains just the | |
35 | * elf_gregset_t that is the pr_reg field of 'struct elf_prstatus'. For all the | |
36 | * other user_regset flavors, the user_regset layout and the ELF core dump note | |
37 | * payload are exactly the same layout. | |
2225a122 SS |
38 | * |
39 | * This interface usage is as follows: | |
40 | * struct iovec iov = { buf, len}; | |
41 | * | |
42 | * ret = ptrace(PTRACE_GETREGSET/PTRACE_SETREGSET, pid, NT_XXX_TYPE, &iov); | |
43 | * | |
44 | * On the successful completion, iov.len will be updated by the kernel, | |
45 | * specifying how much the kernel has written/read to/from the user's iov.buf. | |
46 | */ | |
47 | #define PTRACE_GETREGSET 0x4204 | |
48 | #define PTRACE_SETREGSET 0x4205 | |
49 | ||
1da177e4 LT |
50 | /* options set using PTRACE_SETOPTIONS */ |
51 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
52 | #define PTRACE_O_TRACEFORK 0x00000002 | |
53 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
54 | #define PTRACE_O_TRACECLONE 0x00000008 | |
55 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
56 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
57 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
58 | ||
59 | #define PTRACE_O_MASK 0x0000007f | |
60 | ||
61 | /* Wait extended result codes for the above trace options. */ | |
62 | #define PTRACE_EVENT_FORK 1 | |
63 | #define PTRACE_EVENT_VFORK 2 | |
64 | #define PTRACE_EVENT_CLONE 3 | |
65 | #define PTRACE_EVENT_EXEC 4 | |
66 | #define PTRACE_EVENT_VFORK_DONE 5 | |
67 | #define PTRACE_EVENT_EXIT 6 | |
68 | ||
69 | #include <asm/ptrace.h> | |
70 | ||
71 | #ifdef __KERNEL__ | |
72 | /* | |
73 | * Ptrace flags | |
260ea101 EB |
74 | * |
75 | * The owner ship rules for task->ptrace which holds the ptrace | |
76 | * flags is simple. When a task is running it owns it's task->ptrace | |
77 | * flags. When the a task is stopped the ptracer owns task->ptrace. | |
1da177e4 LT |
78 | */ |
79 | ||
80 | #define PT_PTRACED 0x00000001 | |
81 | #define PT_DTRACE 0x00000002 /* delayed trace (used on m68k, i386) */ | |
82 | #define PT_TRACESYSGOOD 0x00000004 | |
83 | #define PT_PTRACE_CAP 0x00000008 /* ptracer can follow suid-exec */ | |
84 | #define PT_TRACE_FORK 0x00000010 | |
85 | #define PT_TRACE_VFORK 0x00000020 | |
86 | #define PT_TRACE_CLONE 0x00000040 | |
87 | #define PT_TRACE_EXEC 0x00000080 | |
88 | #define PT_TRACE_VFORK_DONE 0x00000100 | |
89 | #define PT_TRACE_EXIT 0x00000200 | |
1da177e4 LT |
90 | |
91 | #define PT_TRACE_MASK 0x000003f4 | |
92 | ||
93 | /* single stepping state bits (used on ARM and PA-RISC) */ | |
94 | #define PT_SINGLESTEP_BIT 31 | |
95 | #define PT_SINGLESTEP (1<<PT_SINGLESTEP_BIT) | |
96 | #define PT_BLOCKSTEP_BIT 30 | |
97 | #define PT_BLOCKSTEP (1<<PT_BLOCKSTEP_BIT) | |
98 | ||
99 | #include <linux/compiler.h> /* For unlikely. */ | |
100 | #include <linux/sched.h> /* For struct task_struct. */ | |
101 | ||
481bed45 CH |
102 | |
103 | extern long arch_ptrace(struct task_struct *child, long request, long addr, long data); | |
6b9c7ed8 | 104 | extern int ptrace_traceme(void); |
1da177e4 LT |
105 | extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len); |
106 | extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len); | |
107 | extern int ptrace_attach(struct task_struct *tsk); | |
108 | extern int ptrace_detach(struct task_struct *, unsigned int); | |
109 | extern void ptrace_disable(struct task_struct *); | |
110 | extern int ptrace_check_attach(struct task_struct *task, int kill); | |
111 | extern int ptrace_request(struct task_struct *child, long request, long addr, long data); | |
112 | extern void ptrace_notify(int exit_code); | |
113 | extern void __ptrace_link(struct task_struct *child, | |
114 | struct task_struct *new_parent); | |
115 | extern void __ptrace_unlink(struct task_struct *child); | |
39c626ae | 116 | extern void exit_ptrace(struct task_struct *tracer); |
006ebb40 SS |
117 | #define PTRACE_MODE_READ 1 |
118 | #define PTRACE_MODE_ATTACH 2 | |
119 | /* Returns 0 on success, -errno on denial. */ | |
120 | extern int __ptrace_may_access(struct task_struct *task, unsigned int mode); | |
121 | /* Returns true on success, false on denial. */ | |
122 | extern bool ptrace_may_access(struct task_struct *task, unsigned int mode); | |
1da177e4 | 123 | |
53b6f9fb ON |
124 | static inline int ptrace_reparented(struct task_struct *child) |
125 | { | |
126 | return child->real_parent != child->parent; | |
127 | } | |
c6a47cc2 | 128 | |
1da177e4 LT |
129 | static inline void ptrace_unlink(struct task_struct *child) |
130 | { | |
131 | if (unlikely(child->ptrace)) | |
132 | __ptrace_unlink(child); | |
133 | } | |
134 | ||
76647323 | 135 | int generic_ptrace_peekdata(struct task_struct *tsk, long addr, long data); |
f284ce72 | 136 | int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data); |
1da177e4 | 137 | |
88ac2921 RM |
138 | /** |
139 | * task_ptrace - return %PT_* flags that apply to a task | |
140 | * @task: pointer to &task_struct in question | |
141 | * | |
142 | * Returns the %PT_* flags that apply to @task. | |
143 | */ | |
144 | static inline int task_ptrace(struct task_struct *task) | |
145 | { | |
146 | return task->ptrace; | |
147 | } | |
148 | ||
149 | /** | |
150 | * ptrace_event - possibly stop for a ptrace event notification | |
151 | * @mask: %PT_* bit to check in @current->ptrace | |
152 | * @event: %PTRACE_EVENT_* value to report if @mask is set | |
153 | * @message: value for %PTRACE_GETEVENTMSG to return | |
154 | * | |
155 | * This checks the @mask bit to see if ptrace wants stops for this event. | |
156 | * If so we stop, reporting @event and @message to the ptrace parent. | |
157 | * | |
158 | * Returns nonzero if we did a ptrace notification, zero if not. | |
159 | * | |
160 | * Called without locks. | |
161 | */ | |
162 | static inline int ptrace_event(int mask, int event, unsigned long message) | |
163 | { | |
164 | if (mask && likely(!(current->ptrace & mask))) | |
165 | return 0; | |
166 | current->ptrace_message = message; | |
167 | ptrace_notify((event << 8) | SIGTRAP); | |
168 | return 1; | |
169 | } | |
170 | ||
09a05394 RM |
171 | /** |
172 | * ptrace_init_task - initialize ptrace state for a new child | |
173 | * @child: new child task | |
174 | * @ptrace: true if child should be ptrace'd by parent's tracer | |
175 | * | |
176 | * This is called immediately after adding @child to its parent's children | |
177 | * list. @ptrace is false in the normal case, and true to ptrace @child. | |
178 | * | |
179 | * Called with current's siglock and write_lock_irq(&tasklist_lock) held. | |
180 | */ | |
181 | static inline void ptrace_init_task(struct task_struct *child, bool ptrace) | |
182 | { | |
183 | INIT_LIST_HEAD(&child->ptrace_entry); | |
184 | INIT_LIST_HEAD(&child->ptraced); | |
185 | child->parent = child->real_parent; | |
186 | child->ptrace = 0; | |
c6a47cc2 | 187 | if (unlikely(ptrace) && (current->ptrace & PT_PTRACED)) { |
09a05394 | 188 | child->ptrace = current->ptrace; |
c6a47cc2 | 189 | __ptrace_link(child, current->parent); |
09a05394 RM |
190 | } |
191 | } | |
192 | ||
dae33574 RM |
193 | /** |
194 | * ptrace_release_task - final ptrace-related cleanup of a zombie being reaped | |
195 | * @task: task in %EXIT_DEAD state | |
196 | * | |
197 | * Called with write_lock(&tasklist_lock) held. | |
198 | */ | |
199 | static inline void ptrace_release_task(struct task_struct *task) | |
200 | { | |
201 | BUG_ON(!list_empty(&task->ptraced)); | |
202 | ptrace_unlink(task); | |
203 | BUG_ON(!list_empty(&task->ptrace_entry)); | |
204 | } | |
205 | ||
1da177e4 LT |
206 | #ifndef force_successful_syscall_return |
207 | /* | |
208 | * System call handlers that, upon successful completion, need to return a | |
209 | * negative value should call force_successful_syscall_return() right before | |
210 | * returning. On architectures where the syscall convention provides for a | |
211 | * separate error flag (e.g., alpha, ia64, ppc{,64}, sparc{,64}, possibly | |
212 | * others), this macro can be used to ensure that the error flag will not get | |
213 | * set. On architectures which do not support a separate error flag, the macro | |
214 | * is a no-op and the spurious error condition needs to be filtered out by some | |
215 | * other means (e.g., in user-level, by passing an extra argument to the | |
216 | * syscall handler, or something along those lines). | |
217 | */ | |
218 | #define force_successful_syscall_return() do { } while (0) | |
219 | #endif | |
220 | ||
fb7fa8f1 RM |
221 | /* |
222 | * <asm/ptrace.h> should define the following things inside #ifdef __KERNEL__. | |
223 | * | |
224 | * These do-nothing inlines are used when the arch does not | |
225 | * implement single-step. The kerneldoc comments are here | |
226 | * to document the interface for all arch definitions. | |
227 | */ | |
228 | ||
229 | #ifndef arch_has_single_step | |
230 | /** | |
231 | * arch_has_single_step - does this CPU support user-mode single-step? | |
232 | * | |
233 | * If this is defined, then there must be function declarations or | |
234 | * inlines for user_enable_single_step() and user_disable_single_step(). | |
235 | * arch_has_single_step() should evaluate to nonzero iff the machine | |
236 | * supports instruction single-step for user mode. | |
237 | * It can be a constant or it can test a CPU feature bit. | |
238 | */ | |
239 | #define arch_has_single_step() (0) | |
240 | ||
241 | /** | |
242 | * user_enable_single_step - single-step in user-mode task | |
243 | * @task: either current or a task stopped in %TASK_TRACED | |
244 | * | |
245 | * This can only be called when arch_has_single_step() has returned nonzero. | |
246 | * Set @task so that when it returns to user mode, it will trap after the | |
dc802c2d RM |
247 | * next single instruction executes. If arch_has_block_step() is defined, |
248 | * this must clear the effects of user_enable_block_step() too. | |
fb7fa8f1 RM |
249 | */ |
250 | static inline void user_enable_single_step(struct task_struct *task) | |
251 | { | |
252 | BUG(); /* This can never be called. */ | |
253 | } | |
254 | ||
255 | /** | |
256 | * user_disable_single_step - cancel user-mode single-step | |
257 | * @task: either current or a task stopped in %TASK_TRACED | |
258 | * | |
dc802c2d RM |
259 | * Clear @task of the effects of user_enable_single_step() and |
260 | * user_enable_block_step(). This can be called whether or not either | |
261 | * of those was ever called on @task, and even if arch_has_single_step() | |
262 | * returned zero. | |
fb7fa8f1 RM |
263 | */ |
264 | static inline void user_disable_single_step(struct task_struct *task) | |
265 | { | |
266 | } | |
dacbe41f CH |
267 | #else |
268 | extern void user_enable_single_step(struct task_struct *); | |
269 | extern void user_disable_single_step(struct task_struct *); | |
fb7fa8f1 RM |
270 | #endif /* arch_has_single_step */ |
271 | ||
dc802c2d RM |
272 | #ifndef arch_has_block_step |
273 | /** | |
274 | * arch_has_block_step - does this CPU support user-mode block-step? | |
275 | * | |
276 | * If this is defined, then there must be a function declaration or inline | |
277 | * for user_enable_block_step(), and arch_has_single_step() must be defined | |
278 | * too. arch_has_block_step() should evaluate to nonzero iff the machine | |
279 | * supports step-until-branch for user mode. It can be a constant or it | |
280 | * can test a CPU feature bit. | |
281 | */ | |
5b88abbf | 282 | #define arch_has_block_step() (0) |
dc802c2d RM |
283 | |
284 | /** | |
285 | * user_enable_block_step - step until branch in user-mode task | |
286 | * @task: either current or a task stopped in %TASK_TRACED | |
287 | * | |
288 | * This can only be called when arch_has_block_step() has returned nonzero, | |
289 | * and will never be called when single-instruction stepping is being used. | |
290 | * Set @task so that when it returns to user mode, it will trap after the | |
291 | * next branch or trap taken. | |
292 | */ | |
293 | static inline void user_enable_block_step(struct task_struct *task) | |
294 | { | |
295 | BUG(); /* This can never be called. */ | |
296 | } | |
dacbe41f CH |
297 | #else |
298 | extern void user_enable_block_step(struct task_struct *); | |
dc802c2d RM |
299 | #endif /* arch_has_block_step */ |
300 | ||
85ec7fd9 ON |
301 | #ifdef ARCH_HAS_USER_SINGLE_STEP_INFO |
302 | extern void user_single_step_siginfo(struct task_struct *tsk, | |
303 | struct pt_regs *regs, siginfo_t *info); | |
304 | #else | |
305 | static inline void user_single_step_siginfo(struct task_struct *tsk, | |
306 | struct pt_regs *regs, siginfo_t *info) | |
307 | { | |
308 | memset(info, 0, sizeof(*info)); | |
309 | info->si_signo = SIGTRAP; | |
310 | } | |
311 | #endif | |
312 | ||
1a669c2f RM |
313 | #ifndef arch_ptrace_stop_needed |
314 | /** | |
315 | * arch_ptrace_stop_needed - Decide whether arch_ptrace_stop() should be called | |
316 | * @code: current->exit_code value ptrace will stop with | |
317 | * @info: siginfo_t pointer (or %NULL) for signal ptrace will stop with | |
318 | * | |
319 | * This is called with the siglock held, to decide whether or not it's | |
320 | * necessary to release the siglock and call arch_ptrace_stop() with the | |
321 | * same @code and @info arguments. It can be defined to a constant if | |
322 | * arch_ptrace_stop() is never required, or always is. On machines where | |
323 | * this makes sense, it should be defined to a quick test to optimize out | |
324 | * calling arch_ptrace_stop() when it would be superfluous. For example, | |
325 | * if the thread has not been back to user mode since the last stop, the | |
326 | * thread state might indicate that nothing needs to be done. | |
327 | */ | |
328 | #define arch_ptrace_stop_needed(code, info) (0) | |
329 | #endif | |
330 | ||
331 | #ifndef arch_ptrace_stop | |
332 | /** | |
333 | * arch_ptrace_stop - Do machine-specific work before stopping for ptrace | |
334 | * @code: current->exit_code value ptrace will stop with | |
335 | * @info: siginfo_t pointer (or %NULL) for signal ptrace will stop with | |
336 | * | |
337 | * This is called with no locks held when arch_ptrace_stop_needed() has | |
338 | * just returned nonzero. It is allowed to block, e.g. for user memory | |
339 | * access. The arch can have machine-specific work to be done before | |
340 | * ptrace stops. On ia64, register backing store gets written back to user | |
341 | * memory here. Since this can be costly (requires dropping the siglock), | |
342 | * we only do it when the arch requires it for this particular stop, as | |
343 | * indicated by arch_ptrace_stop_needed(). | |
344 | */ | |
345 | #define arch_ptrace_stop(code, info) do { } while (0) | |
346 | #endif | |
347 | ||
bf53de90 MM |
348 | #ifndef arch_ptrace_untrace |
349 | /* | |
350 | * Do machine-specific work before untracing child. | |
351 | * | |
352 | * This is called for a normal detach as well as from ptrace_exit() | |
353 | * when the tracing task dies. | |
354 | * | |
355 | * Called with write_lock(&tasklist_lock) held. | |
356 | */ | |
357 | #define arch_ptrace_untrace(task) do { } while (0) | |
358 | #endif | |
359 | ||
bbc69863 RM |
360 | extern int task_current_syscall(struct task_struct *target, long *callno, |
361 | unsigned long args[6], unsigned int maxargs, | |
362 | unsigned long *sp, unsigned long *pc); | |
363 | ||
1da177e4 LT |
364 | #endif |
365 | ||
366 | #endif |