Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
5e9a2692 | 2 | * Ptrace user space interface. |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2010 |
5e9a2692 | 5 | * Author(s): Denis Joseph Barrow |
1da177e4 | 6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/smp.h> | |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/ptrace.h> | |
15 | #include <linux/user.h> | |
16 | #include <linux/security.h> | |
17 | #include <linux/audit.h> | |
7ed20e1a | 18 | #include <linux/signal.h> |
63506c41 MS |
19 | #include <linux/elf.h> |
20 | #include <linux/regset.h> | |
753c4dd6 | 21 | #include <linux/tracehook.h> |
bcf5cef7 | 22 | #include <linux/seccomp.h> |
048cd4e5 | 23 | #include <linux/compat.h> |
9bf1226b | 24 | #include <trace/syscall.h> |
1da177e4 LT |
25 | #include <asm/segment.h> |
26 | #include <asm/page.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/pgalloc.h> | |
1da177e4 | 29 | #include <asm/uaccess.h> |
778959db | 30 | #include <asm/unistd.h> |
a0616cde | 31 | #include <asm/switch_to.h> |
a806170e | 32 | #include "entry.h" |
1da177e4 | 33 | |
347a8dc3 | 34 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
35 | #include "compat_ptrace.h" |
36 | #endif | |
37 | ||
1c569f02 JS |
38 | #define CREATE_TRACE_POINTS |
39 | #include <trace/events/syscalls.h> | |
5e9ad7df | 40 | |
64597f9d | 41 | void update_cr_regs(struct task_struct *task) |
1da177e4 | 42 | { |
5e9a2692 MS |
43 | struct pt_regs *regs = task_pt_regs(task); |
44 | struct thread_struct *thread = &task->thread; | |
a45aff52 | 45 | struct per_regs old, new; |
5e9a2692 | 46 | |
d35339a4 | 47 | /* Take care of the enable/disable of transactional execution. */ |
9977e886 | 48 | if (MACHINE_HAS_TE) { |
c63badeb | 49 | unsigned long cr, cr_new; |
d35339a4 | 50 | |
c63badeb | 51 | __ctl_store(cr, 0, 0); |
9977e886 HB |
52 | /* Set or clear transaction execution TXC bit 8. */ |
53 | cr_new = cr | (1UL << 55); | |
54 | if (task->thread.per_flags & PER_FLAG_NO_TE) | |
55 | cr_new &= ~(1UL << 55); | |
c63badeb | 56 | if (cr_new != cr) |
a8a934e4 | 57 | __ctl_load(cr_new, 0, 0); |
9977e886 HB |
58 | /* Set or clear transaction execution TDC bits 62 and 63. */ |
59 | __ctl_store(cr, 2, 2); | |
60 | cr_new = cr & ~3UL; | |
61 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) { | |
62 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND) | |
63 | cr_new |= 1UL; | |
64 | else | |
65 | cr_new |= 2UL; | |
64597f9d | 66 | } |
9977e886 HB |
67 | if (cr_new != cr) |
68 | __ctl_load(cr_new, 2, 2); | |
d35339a4 | 69 | } |
a45aff52 MS |
70 | /* Copy user specified PER registers */ |
71 | new.control = thread->per_user.control; | |
72 | new.start = thread->per_user.start; | |
73 | new.end = thread->per_user.end; | |
74 | ||
75 | /* merge TIF_SINGLE_STEP into user specified PER registers. */ | |
2a0a5b22 JW |
76 | if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) || |
77 | test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) { | |
818a330c MS |
78 | if (test_tsk_thread_flag(task, TIF_BLOCK_STEP)) |
79 | new.control |= PER_EVENT_BRANCH; | |
80 | else | |
81 | new.control |= PER_EVENT_IFETCH; | |
d35339a4 MS |
82 | new.control |= PER_CONTROL_SUSPENSION; |
83 | new.control |= PER_EVENT_TRANSACTION_END; | |
2a0a5b22 JW |
84 | if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) |
85 | new.control |= PER_EVENT_IFETCH; | |
a45aff52 | 86 | new.start = 0; |
9cb1ccec | 87 | new.end = -1UL; |
a45aff52 | 88 | } |
5e9a2692 MS |
89 | |
90 | /* Take care of the PER enablement bit in the PSW. */ | |
a45aff52 | 91 | if (!(new.control & PER_EVENT_MASK)) { |
1da177e4 | 92 | regs->psw.mask &= ~PSW_MASK_PER; |
5e9a2692 | 93 | return; |
c3311c13 | 94 | } |
5e9a2692 MS |
95 | regs->psw.mask |= PSW_MASK_PER; |
96 | __ctl_store(old, 9, 11); | |
a45aff52 MS |
97 | if (memcmp(&new, &old, sizeof(struct per_regs)) != 0) |
98 | __ctl_load(new, 9, 11); | |
1da177e4 LT |
99 | } |
100 | ||
0ac30be4 | 101 | void user_enable_single_step(struct task_struct *task) |
1da177e4 | 102 | { |
818a330c | 103 | clear_tsk_thread_flag(task, TIF_BLOCK_STEP); |
5e9a2692 | 104 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
105 | } |
106 | ||
0ac30be4 | 107 | void user_disable_single_step(struct task_struct *task) |
1da177e4 | 108 | { |
818a330c | 109 | clear_tsk_thread_flag(task, TIF_BLOCK_STEP); |
5e9a2692 | 110 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
111 | } |
112 | ||
818a330c MS |
113 | void user_enable_block_step(struct task_struct *task) |
114 | { | |
115 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
116 | set_tsk_thread_flag(task, TIF_BLOCK_STEP); | |
117 | } | |
118 | ||
1da177e4 LT |
119 | /* |
120 | * Called by kernel/ptrace.c when detaching.. | |
121 | * | |
5e9a2692 | 122 | * Clear all debugging related fields. |
1da177e4 | 123 | */ |
5e9a2692 | 124 | void ptrace_disable(struct task_struct *task) |
1da177e4 | 125 | { |
5e9a2692 MS |
126 | memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
127 | memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); | |
128 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
d3a73acb | 129 | clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP); |
d35339a4 | 130 | task->thread.per_flags = 0; |
1da177e4 LT |
131 | } |
132 | ||
5a79859a | 133 | #define __ADDR_MASK 7 |
1da177e4 | 134 | |
5e9a2692 MS |
135 | static inline unsigned long __peek_user_per(struct task_struct *child, |
136 | addr_t addr) | |
137 | { | |
138 | struct per_struct_kernel *dummy = NULL; | |
139 | ||
140 | if (addr == (addr_t) &dummy->cr9) | |
141 | /* Control bits of the active per set. */ | |
142 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
143 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
144 | else if (addr == (addr_t) &dummy->cr10) | |
145 | /* Start address of the active per set. */ | |
146 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
147 | 0 : child->thread.per_user.start; | |
148 | else if (addr == (addr_t) &dummy->cr11) | |
149 | /* End address of the active per set. */ | |
150 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
9cb1ccec | 151 | -1UL : child->thread.per_user.end; |
5e9a2692 MS |
152 | else if (addr == (addr_t) &dummy->bits) |
153 | /* Single-step bit. */ | |
154 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
155 | (1UL << (BITS_PER_LONG - 1)) : 0; | |
156 | else if (addr == (addr_t) &dummy->starting_addr) | |
157 | /* Start address of the user specified per set. */ | |
158 | return child->thread.per_user.start; | |
159 | else if (addr == (addr_t) &dummy->ending_addr) | |
160 | /* End address of the user specified per set. */ | |
161 | return child->thread.per_user.end; | |
162 | else if (addr == (addr_t) &dummy->perc_atmid) | |
163 | /* PER code, ATMID and AI of the last PER trap */ | |
164 | return (unsigned long) | |
165 | child->thread.per_event.cause << (BITS_PER_LONG - 16); | |
166 | else if (addr == (addr_t) &dummy->address) | |
167 | /* Address of the last PER trap */ | |
168 | return child->thread.per_event.address; | |
169 | else if (addr == (addr_t) &dummy->access_id) | |
170 | /* Access id of the last PER trap */ | |
171 | return (unsigned long) | |
172 | child->thread.per_event.paid << (BITS_PER_LONG - 8); | |
173 | return 0; | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* |
177 | * Read the word at offset addr from the user area of a process. The | |
178 | * trouble here is that the information is littered over different | |
179 | * locations. The process registers are found on the kernel stack, | |
180 | * the floating point stuff and the trace settings are stored in | |
181 | * the task structure. In addition the different structures in | |
182 | * struct user contain pad bytes that should be read as zeroes. | |
183 | * Lovely... | |
184 | */ | |
63506c41 | 185 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
186 | { |
187 | struct user *dummy = NULL; | |
63506c41 | 188 | addr_t offset, tmp; |
1da177e4 LT |
189 | |
190 | if (addr < (addr_t) &dummy->regs.acrs) { | |
191 | /* | |
192 | * psw and gprs are stored on the stack | |
193 | */ | |
c7584fb6 | 194 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
5ebf250d | 195 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
b50511e4 | 196 | /* Return a clean psw mask. */ |
5ebf250d HC |
197 | tmp &= PSW_MASK_USER | PSW_MASK_RI; |
198 | tmp |= PSW_USER_BITS; | |
199 | } | |
1da177e4 LT |
200 | |
201 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
202 | /* | |
203 | * access registers are stored in the thread structure | |
204 | */ | |
205 | offset = addr - (addr_t) &dummy->regs.acrs; | |
778959db MS |
206 | /* |
207 | * Very special case: old & broken 64 bit gdb reading | |
208 | * from acrs[15]. Result is a 64 bit value. Read the | |
209 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
210 | */ | |
211 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
212 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
213 | else | |
5a79859a | 214 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
1da177e4 LT |
215 | |
216 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
217 | /* | |
218 | * orig_gpr2 is stored on the kernel stack | |
219 | */ | |
c7584fb6 | 220 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 221 | |
3d6e48f4 JW |
222 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
223 | /* | |
224 | * prevent reads of padding hole between | |
225 | * orig_gpr2 and fp_regs on s390. | |
226 | */ | |
227 | tmp = 0; | |
228 | ||
86c558e8 MS |
229 | } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) { |
230 | /* | |
231 | * floating point control reg. is in the thread structure | |
232 | */ | |
904818e2 | 233 | tmp = child->thread.fpu.fpc; |
86c558e8 MS |
234 | tmp <<= BITS_PER_LONG - 32; |
235 | ||
1da177e4 | 236 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
86c558e8 | 237 | /* |
904818e2 HB |
238 | * floating point regs. are either in child->thread.fpu |
239 | * or the child->thread.fpu.vxrs array | |
1da177e4 | 240 | */ |
86c558e8 | 241 | offset = addr - (addr_t) &dummy->regs.fp_regs.fprs; |
b5510d9b | 242 | if (MACHINE_HAS_VX) |
86c558e8 | 243 | tmp = *(addr_t *) |
904818e2 | 244 | ((addr_t) child->thread.fpu.vxrs + 2*offset); |
86c558e8 | 245 | else |
86c558e8 | 246 | tmp = *(addr_t *) |
55a423b6 | 247 | ((addr_t) child->thread.fpu.fprs + offset); |
1da177e4 LT |
248 | |
249 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
250 | /* | |
5e9a2692 | 251 | * Handle access to the per_info structure. |
1da177e4 | 252 | */ |
5e9a2692 MS |
253 | addr -= (addr_t) &dummy->regs.per_info; |
254 | tmp = __peek_user_per(child, addr); | |
1da177e4 LT |
255 | |
256 | } else | |
257 | tmp = 0; | |
258 | ||
63506c41 | 259 | return tmp; |
1da177e4 LT |
260 | } |
261 | ||
1da177e4 | 262 | static int |
63506c41 | 263 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 264 | { |
63506c41 | 265 | addr_t tmp, mask; |
1da177e4 LT |
266 | |
267 | /* | |
268 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 269 | * an alignment of 4. Programmers from hell... |
1da177e4 | 270 | */ |
778959db | 271 | mask = __ADDR_MASK; |
547e3cec MS |
272 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
273 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db | 274 | mask = 3; |
778959db | 275 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) |
1da177e4 LT |
276 | return -EIO; |
277 | ||
63506c41 MS |
278 | tmp = __peek_user(child, addr); |
279 | return put_user(tmp, (addr_t __user *) data); | |
280 | } | |
281 | ||
5e9a2692 MS |
282 | static inline void __poke_user_per(struct task_struct *child, |
283 | addr_t addr, addr_t data) | |
284 | { | |
285 | struct per_struct_kernel *dummy = NULL; | |
286 | ||
287 | /* | |
288 | * There are only three fields in the per_info struct that the | |
289 | * debugger user can write to. | |
290 | * 1) cr9: the debugger wants to set a new PER event mask | |
291 | * 2) starting_addr: the debugger wants to set a new starting | |
292 | * address to use with the PER event mask. | |
293 | * 3) ending_addr: the debugger wants to set a new ending | |
294 | * address to use with the PER event mask. | |
295 | * The user specified PER event mask and the start and end | |
296 | * addresses are used only if single stepping is not in effect. | |
297 | * Writes to any other field in per_info are ignored. | |
298 | */ | |
299 | if (addr == (addr_t) &dummy->cr9) | |
300 | /* PER event mask of the user specified per set. */ | |
301 | child->thread.per_user.control = | |
302 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
303 | else if (addr == (addr_t) &dummy->starting_addr) | |
304 | /* Starting address of the user specified per set. */ | |
305 | child->thread.per_user.start = data; | |
306 | else if (addr == (addr_t) &dummy->ending_addr) | |
307 | /* Ending address of the user specified per set. */ | |
308 | child->thread.per_user.end = data; | |
309 | } | |
310 | ||
63506c41 MS |
311 | /* |
312 | * Write a word to the user area of a process at location addr. This | |
313 | * operation does have an additional problem compared to peek_user. | |
314 | * Stores to the program status word and on the floating point | |
315 | * control register needs to get checked for validity. | |
316 | */ | |
317 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
318 | { | |
319 | struct user *dummy = NULL; | |
d4e81b35 | 320 | addr_t offset; |
63506c41 | 321 | |
1da177e4 LT |
322 | if (addr < (addr_t) &dummy->regs.acrs) { |
323 | /* | |
324 | * psw and gprs are stored on the stack | |
325 | */ | |
5ebf250d HC |
326 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
327 | unsigned long mask = PSW_MASK_USER; | |
328 | ||
329 | mask |= is_ri_task(child) ? PSW_MASK_RI : 0; | |
dab6cf55 MS |
330 | if ((data ^ PSW_USER_BITS) & ~mask) |
331 | /* Invalid psw mask. */ | |
332 | return -EINVAL; | |
333 | if ((data & PSW_MASK_ASC) == PSW_ASC_HOME) | |
334 | /* Invalid address-space-control bits */ | |
5ebf250d HC |
335 | return -EINVAL; |
336 | if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)) | |
dab6cf55 | 337 | /* Invalid addressing mode bits */ |
5ebf250d HC |
338 | return -EINVAL; |
339 | } | |
c7584fb6 | 340 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
341 | |
342 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
343 | /* | |
344 | * access registers are stored in the thread structure | |
345 | */ | |
346 | offset = addr - (addr_t) &dummy->regs.acrs; | |
778959db MS |
347 | /* |
348 | * Very special case: old & broken 64 bit gdb writing | |
349 | * to acrs[15] with a 64 bit value. Ignore the lower | |
350 | * half of the value and write the upper 32 bit to | |
351 | * acrs[15]. Sick... | |
352 | */ | |
353 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
354 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
355 | else | |
5a79859a | 356 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
1da177e4 LT |
357 | |
358 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
359 | /* | |
360 | * orig_gpr2 is stored on the kernel stack | |
361 | */ | |
c7584fb6 | 362 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 363 | |
3d6e48f4 JW |
364 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
365 | /* | |
366 | * prevent writes of padding hole between | |
367 | * orig_gpr2 and fp_regs on s390. | |
368 | */ | |
369 | return 0; | |
370 | ||
86c558e8 MS |
371 | } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) { |
372 | /* | |
373 | * floating point control reg. is in the thread structure | |
374 | */ | |
375 | if ((unsigned int) data != 0 || | |
376 | test_fp_ctl(data >> (BITS_PER_LONG - 32))) | |
377 | return -EINVAL; | |
904818e2 | 378 | child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32); |
86c558e8 | 379 | |
1da177e4 LT |
380 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
381 | /* | |
904818e2 HB |
382 | * floating point regs. are either in child->thread.fpu |
383 | * or the child->thread.fpu.vxrs array | |
1da177e4 | 384 | */ |
86c558e8 | 385 | offset = addr - (addr_t) &dummy->regs.fp_regs.fprs; |
b5510d9b | 386 | if (MACHINE_HAS_VX) |
86c558e8 | 387 | *(addr_t *)((addr_t) |
904818e2 | 388 | child->thread.fpu.vxrs + 2*offset) = data; |
86c558e8 | 389 | else |
86c558e8 | 390 | *(addr_t *)((addr_t) |
55a423b6 | 391 | child->thread.fpu.fprs + offset) = data; |
1da177e4 LT |
392 | |
393 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
394 | /* | |
5e9a2692 | 395 | * Handle access to the per_info structure. |
1da177e4 | 396 | */ |
5e9a2692 MS |
397 | addr -= (addr_t) &dummy->regs.per_info; |
398 | __poke_user_per(child, addr, data); | |
1da177e4 LT |
399 | |
400 | } | |
401 | ||
1da177e4 LT |
402 | return 0; |
403 | } | |
404 | ||
5e9a2692 | 405 | static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
63506c41 | 406 | { |
63506c41 MS |
407 | addr_t mask; |
408 | ||
409 | /* | |
410 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
411 | * an alignment of 4. Programmers from hell indeed... | |
412 | */ | |
413 | mask = __ADDR_MASK; | |
547e3cec MS |
414 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
415 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 | 416 | mask = 3; |
63506c41 MS |
417 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) |
418 | return -EIO; | |
419 | ||
420 | return __poke_user(child, addr, data); | |
421 | } | |
422 | ||
9b05a69e NK |
423 | long arch_ptrace(struct task_struct *child, long request, |
424 | unsigned long addr, unsigned long data) | |
1da177e4 | 425 | { |
1da177e4 LT |
426 | ptrace_area parea; |
427 | int copied, ret; | |
428 | ||
429 | switch (request) { | |
1da177e4 LT |
430 | case PTRACE_PEEKUSR: |
431 | /* read the word at location addr in the USER area. */ | |
432 | return peek_user(child, addr, data); | |
433 | ||
1da177e4 LT |
434 | case PTRACE_POKEUSR: |
435 | /* write the word at location addr in the USER area */ | |
436 | return poke_user(child, addr, data); | |
437 | ||
438 | case PTRACE_PEEKUSR_AREA: | |
439 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 440 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
441 | sizeof(parea))) |
442 | return -EFAULT; | |
443 | addr = parea.kernel_addr; | |
444 | data = parea.process_addr; | |
445 | copied = 0; | |
446 | while (copied < parea.len) { | |
447 | if (request == PTRACE_PEEKUSR_AREA) | |
448 | ret = peek_user(child, addr, data); | |
449 | else { | |
2b67fc46 HC |
450 | addr_t utmp; |
451 | if (get_user(utmp, | |
452 | (addr_t __force __user *) data)) | |
1da177e4 | 453 | return -EFAULT; |
2b67fc46 | 454 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
455 | } |
456 | if (ret) | |
457 | return ret; | |
458 | addr += sizeof(unsigned long); | |
459 | data += sizeof(unsigned long); | |
460 | copied += sizeof(unsigned long); | |
461 | } | |
462 | return 0; | |
86f2552b MS |
463 | case PTRACE_GET_LAST_BREAK: |
464 | put_user(task_thread_info(child)->last_break, | |
465 | (unsigned long __user *) data); | |
466 | return 0; | |
d35339a4 MS |
467 | case PTRACE_ENABLE_TE: |
468 | if (!MACHINE_HAS_TE) | |
469 | return -EIO; | |
470 | child->thread.per_flags &= ~PER_FLAG_NO_TE; | |
471 | return 0; | |
472 | case PTRACE_DISABLE_TE: | |
473 | if (!MACHINE_HAS_TE) | |
474 | return -EIO; | |
475 | child->thread.per_flags |= PER_FLAG_NO_TE; | |
64597f9d MM |
476 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; |
477 | return 0; | |
478 | case PTRACE_TE_ABORT_RAND: | |
479 | if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE)) | |
480 | return -EIO; | |
481 | switch (data) { | |
482 | case 0UL: | |
483 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; | |
484 | break; | |
485 | case 1UL: | |
486 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
487 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND; | |
488 | break; | |
489 | case 2UL: | |
490 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
491 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND; | |
492 | break; | |
493 | default: | |
494 | return -EINVAL; | |
495 | } | |
d35339a4 | 496 | return 0; |
07805ac8 | 497 | default: |
07805ac8 | 498 | return ptrace_request(child, request, addr, data); |
1da177e4 | 499 | } |
1da177e4 LT |
500 | } |
501 | ||
347a8dc3 | 502 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
503 | /* |
504 | * Now the fun part starts... a 31 bit program running in the | |
505 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
506 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
507 | * to handle, the difference to the 64 bit versions of the requests | |
508 | * is that the access is done in multiples of 4 byte instead of | |
509 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
510 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
511 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
512 | * is a 31 bit program too, the content of struct user can be | |
513 | * emulated. A 31 bit program peeking into the struct user of | |
514 | * a 64 bit program is a no-no. | |
515 | */ | |
516 | ||
5e9a2692 MS |
517 | /* |
518 | * Same as peek_user_per but for a 31 bit program. | |
519 | */ | |
520 | static inline __u32 __peek_user_per_compat(struct task_struct *child, | |
521 | addr_t addr) | |
522 | { | |
523 | struct compat_per_struct_kernel *dummy32 = NULL; | |
524 | ||
525 | if (addr == (addr_t) &dummy32->cr9) | |
526 | /* Control bits of the active per set. */ | |
527 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
528 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
529 | else if (addr == (addr_t) &dummy32->cr10) | |
530 | /* Start address of the active per set. */ | |
531 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
532 | 0 : child->thread.per_user.start; | |
533 | else if (addr == (addr_t) &dummy32->cr11) | |
534 | /* End address of the active per set. */ | |
535 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
536 | PSW32_ADDR_INSN : child->thread.per_user.end; | |
537 | else if (addr == (addr_t) &dummy32->bits) | |
538 | /* Single-step bit. */ | |
539 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
540 | 0x80000000 : 0; | |
541 | else if (addr == (addr_t) &dummy32->starting_addr) | |
542 | /* Start address of the user specified per set. */ | |
543 | return (__u32) child->thread.per_user.start; | |
544 | else if (addr == (addr_t) &dummy32->ending_addr) | |
545 | /* End address of the user specified per set. */ | |
546 | return (__u32) child->thread.per_user.end; | |
547 | else if (addr == (addr_t) &dummy32->perc_atmid) | |
548 | /* PER code, ATMID and AI of the last PER trap */ | |
549 | return (__u32) child->thread.per_event.cause << 16; | |
550 | else if (addr == (addr_t) &dummy32->address) | |
551 | /* Address of the last PER trap */ | |
552 | return (__u32) child->thread.per_event.address; | |
553 | else if (addr == (addr_t) &dummy32->access_id) | |
554 | /* Access id of the last PER trap */ | |
555 | return (__u32) child->thread.per_event.paid << 24; | |
556 | return 0; | |
557 | } | |
558 | ||
1da177e4 LT |
559 | /* |
560 | * Same as peek_user but for a 31 bit program. | |
561 | */ | |
63506c41 | 562 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 | 563 | { |
5e9a2692 | 564 | struct compat_user *dummy32 = NULL; |
1da177e4 LT |
565 | addr_t offset; |
566 | __u32 tmp; | |
567 | ||
1da177e4 | 568 | if (addr < (addr_t) &dummy32->regs.acrs) { |
b50511e4 | 569 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
570 | /* |
571 | * psw and gprs are stored on the stack | |
572 | */ | |
573 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
574 | /* Fake a 31 bit psw mask. */ | |
b50511e4 | 575 | tmp = (__u32)(regs->psw.mask >> 32); |
5ebf250d | 576 | tmp &= PSW32_MASK_USER | PSW32_MASK_RI; |
f26946d7 | 577 | tmp |= PSW32_USER_BITS; |
1da177e4 LT |
578 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
579 | /* Fake a 31 bit psw address. */ | |
d4e81b35 MS |
580 | tmp = (__u32) regs->psw.addr | |
581 | (__u32)(regs->psw.mask & PSW_MASK_BA); | |
1da177e4 LT |
582 | } else { |
583 | /* gpr 0-15 */ | |
b50511e4 | 584 | tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
1da177e4 LT |
585 | } |
586 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
587 | /* | |
588 | * access registers are stored in the thread structure | |
589 | */ | |
590 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
591 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
592 | ||
593 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
594 | /* | |
595 | * orig_gpr2 is stored on the kernel stack | |
596 | */ | |
c7584fb6 | 597 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 598 | |
3d6e48f4 JW |
599 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
600 | /* | |
601 | * prevent reads of padding hole between | |
602 | * orig_gpr2 and fp_regs on s390. | |
603 | */ | |
604 | tmp = 0; | |
605 | ||
86c558e8 MS |
606 | } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) { |
607 | /* | |
608 | * floating point control reg. is in the thread structure | |
609 | */ | |
904818e2 | 610 | tmp = child->thread.fpu.fpc; |
86c558e8 | 611 | |
1da177e4 LT |
612 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
613 | /* | |
904818e2 HB |
614 | * floating point regs. are either in child->thread.fpu |
615 | * or the child->thread.fpu.vxrs array | |
1da177e4 | 616 | */ |
86c558e8 | 617 | offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs; |
b5510d9b | 618 | if (MACHINE_HAS_VX) |
86c558e8 | 619 | tmp = *(__u32 *) |
904818e2 | 620 | ((addr_t) child->thread.fpu.vxrs + 2*offset); |
86c558e8 | 621 | else |
86c558e8 | 622 | tmp = *(__u32 *) |
55a423b6 | 623 | ((addr_t) child->thread.fpu.fprs + offset); |
1da177e4 LT |
624 | |
625 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
626 | /* | |
5e9a2692 | 627 | * Handle access to the per_info structure. |
1da177e4 | 628 | */ |
5e9a2692 MS |
629 | addr -= (addr_t) &dummy32->regs.per_info; |
630 | tmp = __peek_user_per_compat(child, addr); | |
1da177e4 LT |
631 | |
632 | } else | |
633 | tmp = 0; | |
634 | ||
63506c41 MS |
635 | return tmp; |
636 | } | |
637 | ||
638 | static int peek_user_compat(struct task_struct *child, | |
639 | addr_t addr, addr_t data) | |
640 | { | |
641 | __u32 tmp; | |
642 | ||
7757591a | 643 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
644 | return -EIO; |
645 | ||
646 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
647 | return put_user(tmp, (__u32 __user *) data); |
648 | } | |
649 | ||
5e9a2692 MS |
650 | /* |
651 | * Same as poke_user_per but for a 31 bit program. | |
652 | */ | |
653 | static inline void __poke_user_per_compat(struct task_struct *child, | |
654 | addr_t addr, __u32 data) | |
655 | { | |
656 | struct compat_per_struct_kernel *dummy32 = NULL; | |
657 | ||
658 | if (addr == (addr_t) &dummy32->cr9) | |
659 | /* PER event mask of the user specified per set. */ | |
660 | child->thread.per_user.control = | |
661 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
662 | else if (addr == (addr_t) &dummy32->starting_addr) | |
663 | /* Starting address of the user specified per set. */ | |
664 | child->thread.per_user.start = data; | |
665 | else if (addr == (addr_t) &dummy32->ending_addr) | |
666 | /* Ending address of the user specified per set. */ | |
667 | child->thread.per_user.end = data; | |
668 | } | |
669 | ||
1da177e4 LT |
670 | /* |
671 | * Same as poke_user but for a 31 bit program. | |
672 | */ | |
63506c41 MS |
673 | static int __poke_user_compat(struct task_struct *child, |
674 | addr_t addr, addr_t data) | |
1da177e4 | 675 | { |
5e9a2692 | 676 | struct compat_user *dummy32 = NULL; |
63506c41 | 677 | __u32 tmp = (__u32) data; |
1da177e4 | 678 | addr_t offset; |
1da177e4 LT |
679 | |
680 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
b50511e4 | 681 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
682 | /* |
683 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
684 | */ | |
685 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
5ebf250d HC |
686 | __u32 mask = PSW32_MASK_USER; |
687 | ||
688 | mask |= is_ri_task(child) ? PSW32_MASK_RI : 0; | |
1da177e4 | 689 | /* Build a 64 bit psw mask from 31 bit mask. */ |
dab6cf55 | 690 | if ((tmp ^ PSW32_USER_BITS) & ~mask) |
1da177e4 LT |
691 | /* Invalid psw mask. */ |
692 | return -EINVAL; | |
dab6cf55 MS |
693 | if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME) |
694 | /* Invalid address-space-control bits */ | |
695 | return -EINVAL; | |
b50511e4 | 696 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 | 697 | (regs->psw.mask & PSW_MASK_BA) | |
5ebf250d | 698 | (__u64)(tmp & mask) << 32; |
1da177e4 LT |
699 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
700 | /* Build a 64 bit psw address from 31 bit address. */ | |
b50511e4 | 701 | regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
d4e81b35 MS |
702 | /* Transfer 31 bit amode bit to psw mask. */ |
703 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | | |
704 | (__u64)(tmp & PSW32_ADDR_AMODE); | |
1da177e4 LT |
705 | } else { |
706 | /* gpr 0-15 */ | |
b50511e4 | 707 | *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
1da177e4 LT |
708 | } |
709 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
710 | /* | |
711 | * access registers are stored in the thread structure | |
712 | */ | |
713 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
714 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
715 | ||
716 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
717 | /* | |
718 | * orig_gpr2 is stored on the kernel stack | |
719 | */ | |
c7584fb6 | 720 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 721 | |
3d6e48f4 JW |
722 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
723 | /* | |
724 | * prevent writess of padding hole between | |
725 | * orig_gpr2 and fp_regs on s390. | |
726 | */ | |
727 | return 0; | |
728 | ||
86c558e8 | 729 | } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) { |
1da177e4 | 730 | /* |
86c558e8 | 731 | * floating point control reg. is in the thread structure |
1da177e4 | 732 | */ |
86c558e8 | 733 | if (test_fp_ctl(tmp)) |
1da177e4 | 734 | return -EINVAL; |
904818e2 | 735 | child->thread.fpu.fpc = data; |
86c558e8 MS |
736 | |
737 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { | |
738 | /* | |
904818e2 HB |
739 | * floating point regs. are either in child->thread.fpu |
740 | * or the child->thread.fpu.vxrs array | |
86c558e8 MS |
741 | */ |
742 | offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs; | |
b5510d9b | 743 | if (MACHINE_HAS_VX) |
86c558e8 | 744 | *(__u32 *)((addr_t) |
904818e2 | 745 | child->thread.fpu.vxrs + 2*offset) = tmp; |
86c558e8 | 746 | else |
86c558e8 | 747 | *(__u32 *)((addr_t) |
55a423b6 | 748 | child->thread.fpu.fprs + offset) = tmp; |
1da177e4 LT |
749 | |
750 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
751 | /* | |
5e9a2692 | 752 | * Handle access to the per_info structure. |
1da177e4 | 753 | */ |
5e9a2692 MS |
754 | addr -= (addr_t) &dummy32->regs.per_info; |
755 | __poke_user_per_compat(child, addr, data); | |
1da177e4 LT |
756 | } |
757 | ||
1da177e4 LT |
758 | return 0; |
759 | } | |
760 | ||
63506c41 MS |
761 | static int poke_user_compat(struct task_struct *child, |
762 | addr_t addr, addr_t data) | |
763 | { | |
5e9a2692 MS |
764 | if (!is_compat_task() || (addr & 3) || |
765 | addr > sizeof(struct compat_user) - 3) | |
63506c41 MS |
766 | return -EIO; |
767 | ||
768 | return __poke_user_compat(child, addr, data); | |
769 | } | |
770 | ||
b499d76b RM |
771 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
772 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 773 | { |
b499d76b RM |
774 | unsigned long addr = caddr; |
775 | unsigned long data = cdata; | |
5e9a2692 | 776 | compat_ptrace_area parea; |
1da177e4 LT |
777 | int copied, ret; |
778 | ||
779 | switch (request) { | |
1da177e4 LT |
780 | case PTRACE_PEEKUSR: |
781 | /* read the word at location addr in the USER area. */ | |
63506c41 | 782 | return peek_user_compat(child, addr, data); |
1da177e4 | 783 | |
1da177e4 LT |
784 | case PTRACE_POKEUSR: |
785 | /* write the word at location addr in the USER area */ | |
63506c41 | 786 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
787 | |
788 | case PTRACE_PEEKUSR_AREA: | |
789 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 790 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
791 | sizeof(parea))) |
792 | return -EFAULT; | |
793 | addr = parea.kernel_addr; | |
794 | data = parea.process_addr; | |
795 | copied = 0; | |
796 | while (copied < parea.len) { | |
797 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 798 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 799 | else { |
2b67fc46 HC |
800 | __u32 utmp; |
801 | if (get_user(utmp, | |
802 | (__u32 __force __user *) data)) | |
1da177e4 | 803 | return -EFAULT; |
63506c41 | 804 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
805 | } |
806 | if (ret) | |
807 | return ret; | |
808 | addr += sizeof(unsigned int); | |
809 | data += sizeof(unsigned int); | |
810 | copied += sizeof(unsigned int); | |
811 | } | |
812 | return 0; | |
86f2552b MS |
813 | case PTRACE_GET_LAST_BREAK: |
814 | put_user(task_thread_info(child)->last_break, | |
815 | (unsigned int __user *) data); | |
816 | return 0; | |
1da177e4 | 817 | } |
b499d76b | 818 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
819 | } |
820 | #endif | |
821 | ||
753c4dd6 | 822 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 823 | { |
da7f750c | 824 | unsigned long mask = -1UL; |
1da177e4 | 825 | |
c5c3a6d8 | 826 | /* |
753c4dd6 MS |
827 | * The sysc_tracesys code in entry.S stored the system |
828 | * call number to gprs[2]. | |
c5c3a6d8 | 829 | */ |
753c4dd6 MS |
830 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
831 | (tracehook_report_syscall_entry(regs) || | |
832 | regs->gprs[2] >= NR_syscalls)) { | |
833 | /* | |
834 | * Tracing decided this syscall should not happen or the | |
835 | * debugger stored an invalid system call number. Skip | |
836 | * the system call and the system call restart handling. | |
837 | */ | |
d3a73acb | 838 | clear_pt_regs_flag(regs, PIF_SYSCALL); |
0208b944 KC |
839 | return -1; |
840 | } | |
841 | ||
842 | /* Do the secure computing check after ptrace. */ | |
843 | if (secure_computing(NULL)) { | |
844 | /* seccomp failures shouldn't expose any additional code. */ | |
845 | return -1; | |
1da177e4 | 846 | } |
753c4dd6 | 847 | |
66700001 | 848 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 849 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 850 | |
da7f750c PM |
851 | if (is_compat_task()) |
852 | mask = 0xffffffff; | |
853 | ||
854 | audit_syscall_entry(regs->gprs[2], regs->orig_gpr2 & mask, | |
797cee98 LT |
855 | regs->gprs[3] &mask, regs->gprs[4] &mask, |
856 | regs->gprs[5] &mask); | |
0208b944 KC |
857 | |
858 | return regs->gprs[2]; | |
753c4dd6 MS |
859 | } |
860 | ||
861 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
862 | { | |
d7e7528b | 863 | audit_syscall_exit(regs); |
753c4dd6 | 864 | |
66700001 | 865 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 866 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 867 | |
753c4dd6 MS |
868 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
869 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 870 | } |
63506c41 MS |
871 | |
872 | /* | |
873 | * user_regset definitions. | |
874 | */ | |
875 | ||
876 | static int s390_regs_get(struct task_struct *target, | |
877 | const struct user_regset *regset, | |
878 | unsigned int pos, unsigned int count, | |
879 | void *kbuf, void __user *ubuf) | |
880 | { | |
881 | if (target == current) | |
882 | save_access_regs(target->thread.acrs); | |
883 | ||
884 | if (kbuf) { | |
885 | unsigned long *k = kbuf; | |
886 | while (count > 0) { | |
887 | *k++ = __peek_user(target, pos); | |
888 | count -= sizeof(*k); | |
889 | pos += sizeof(*k); | |
890 | } | |
891 | } else { | |
892 | unsigned long __user *u = ubuf; | |
893 | while (count > 0) { | |
894 | if (__put_user(__peek_user(target, pos), u++)) | |
895 | return -EFAULT; | |
896 | count -= sizeof(*u); | |
897 | pos += sizeof(*u); | |
898 | } | |
899 | } | |
900 | return 0; | |
901 | } | |
902 | ||
903 | static int s390_regs_set(struct task_struct *target, | |
904 | const struct user_regset *regset, | |
905 | unsigned int pos, unsigned int count, | |
906 | const void *kbuf, const void __user *ubuf) | |
907 | { | |
908 | int rc = 0; | |
909 | ||
910 | if (target == current) | |
911 | save_access_regs(target->thread.acrs); | |
912 | ||
913 | if (kbuf) { | |
914 | const unsigned long *k = kbuf; | |
915 | while (count > 0 && !rc) { | |
916 | rc = __poke_user(target, pos, *k++); | |
917 | count -= sizeof(*k); | |
918 | pos += sizeof(*k); | |
919 | } | |
920 | } else { | |
921 | const unsigned long __user *u = ubuf; | |
922 | while (count > 0 && !rc) { | |
923 | unsigned long word; | |
924 | rc = __get_user(word, u++); | |
925 | if (rc) | |
926 | break; | |
927 | rc = __poke_user(target, pos, word); | |
928 | count -= sizeof(*u); | |
929 | pos += sizeof(*u); | |
930 | } | |
931 | } | |
932 | ||
933 | if (rc == 0 && target == current) | |
934 | restore_access_regs(target->thread.acrs); | |
935 | ||
936 | return rc; | |
937 | } | |
938 | ||
939 | static int s390_fpregs_get(struct task_struct *target, | |
940 | const struct user_regset *regset, unsigned int pos, | |
941 | unsigned int count, void *kbuf, void __user *ubuf) | |
942 | { | |
904818e2 HB |
943 | _s390_fp_regs fp_regs; |
944 | ||
945 | if (target == current) | |
d0164ee2 | 946 | save_fpu_regs(); |
904818e2 HB |
947 | |
948 | fp_regs.fpc = target->thread.fpu.fpc; | |
949 | fpregs_store(&fp_regs, &target->thread.fpu); | |
63506c41 MS |
950 | |
951 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
904818e2 | 952 | &fp_regs, 0, -1); |
63506c41 MS |
953 | } |
954 | ||
955 | static int s390_fpregs_set(struct task_struct *target, | |
956 | const struct user_regset *regset, unsigned int pos, | |
957 | unsigned int count, const void *kbuf, | |
958 | const void __user *ubuf) | |
959 | { | |
960 | int rc = 0; | |
904818e2 | 961 | freg_t fprs[__NUM_FPRS]; |
63506c41 | 962 | |
904818e2 | 963 | if (target == current) |
d0164ee2 | 964 | save_fpu_regs(); |
63506c41 MS |
965 | |
966 | /* If setting FPC, must validate it first. */ | |
967 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
904818e2 | 968 | u32 ufpc[2] = { target->thread.fpu.fpc, 0 }; |
4725c860 | 969 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc, |
63506c41 MS |
970 | 0, offsetof(s390_fp_regs, fprs)); |
971 | if (rc) | |
972 | return rc; | |
4725c860 | 973 | if (ufpc[1] != 0 || test_fp_ctl(ufpc[0])) |
63506c41 | 974 | return -EINVAL; |
904818e2 | 975 | target->thread.fpu.fpc = ufpc[0]; |
63506c41 MS |
976 | } |
977 | ||
978 | if (rc == 0 && count > 0) | |
979 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
904818e2 HB |
980 | fprs, offsetof(s390_fp_regs, fprs), -1); |
981 | if (rc) | |
982 | return rc; | |
63506c41 | 983 | |
b5510d9b | 984 | if (MACHINE_HAS_VX) |
904818e2 HB |
985 | convert_fp_to_vx(target->thread.fpu.vxrs, fprs); |
986 | else | |
987 | memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs)); | |
988 | ||
63506c41 MS |
989 | return rc; |
990 | } | |
991 | ||
86f2552b MS |
992 | static int s390_last_break_get(struct task_struct *target, |
993 | const struct user_regset *regset, | |
994 | unsigned int pos, unsigned int count, | |
995 | void *kbuf, void __user *ubuf) | |
996 | { | |
997 | if (count > 0) { | |
998 | if (kbuf) { | |
999 | unsigned long *k = kbuf; | |
1000 | *k = task_thread_info(target)->last_break; | |
1001 | } else { | |
1002 | unsigned long __user *u = ubuf; | |
1003 | if (__put_user(task_thread_info(target)->last_break, u)) | |
1004 | return -EFAULT; | |
1005 | } | |
1006 | } | |
1007 | return 0; | |
1008 | } | |
1009 | ||
b934069c MS |
1010 | static int s390_last_break_set(struct task_struct *target, |
1011 | const struct user_regset *regset, | |
1012 | unsigned int pos, unsigned int count, | |
1013 | const void *kbuf, const void __user *ubuf) | |
1014 | { | |
1015 | return 0; | |
1016 | } | |
1017 | ||
d35339a4 MS |
1018 | static int s390_tdb_get(struct task_struct *target, |
1019 | const struct user_regset *regset, | |
1020 | unsigned int pos, unsigned int count, | |
1021 | void *kbuf, void __user *ubuf) | |
1022 | { | |
1023 | struct pt_regs *regs = task_pt_regs(target); | |
1024 | unsigned char *data; | |
1025 | ||
1026 | if (!(regs->int_code & 0x200)) | |
1027 | return -ENODATA; | |
1028 | data = target->thread.trap_tdb; | |
1029 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256); | |
1030 | } | |
1031 | ||
1032 | static int s390_tdb_set(struct task_struct *target, | |
1033 | const struct user_regset *regset, | |
1034 | unsigned int pos, unsigned int count, | |
1035 | const void *kbuf, const void __user *ubuf) | |
1036 | { | |
1037 | return 0; | |
1038 | } | |
1039 | ||
80703617 MS |
1040 | static int s390_vxrs_low_get(struct task_struct *target, |
1041 | const struct user_regset *regset, | |
1042 | unsigned int pos, unsigned int count, | |
1043 | void *kbuf, void __user *ubuf) | |
1044 | { | |
1045 | __u64 vxrs[__NUM_VXRS_LOW]; | |
1046 | int i; | |
1047 | ||
7490daf0 MS |
1048 | if (!MACHINE_HAS_VX) |
1049 | return -ENODEV; | |
b5510d9b HB |
1050 | if (target == current) |
1051 | save_fpu_regs(); | |
1052 | for (i = 0; i < __NUM_VXRS_LOW; i++) | |
1053 | vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1); | |
80703617 MS |
1054 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); |
1055 | } | |
1056 | ||
1057 | static int s390_vxrs_low_set(struct task_struct *target, | |
1058 | const struct user_regset *regset, | |
1059 | unsigned int pos, unsigned int count, | |
1060 | const void *kbuf, const void __user *ubuf) | |
1061 | { | |
1062 | __u64 vxrs[__NUM_VXRS_LOW]; | |
1063 | int i, rc; | |
1064 | ||
7490daf0 MS |
1065 | if (!MACHINE_HAS_VX) |
1066 | return -ENODEV; | |
b5510d9b | 1067 | if (target == current) |
d0164ee2 | 1068 | save_fpu_regs(); |
80703617 MS |
1069 | |
1070 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); | |
9977e886 | 1071 | if (rc == 0) |
80703617 | 1072 | for (i = 0; i < __NUM_VXRS_LOW; i++) |
904818e2 | 1073 | *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i]; |
80703617 MS |
1074 | |
1075 | return rc; | |
1076 | } | |
1077 | ||
1078 | static int s390_vxrs_high_get(struct task_struct *target, | |
1079 | const struct user_regset *regset, | |
1080 | unsigned int pos, unsigned int count, | |
1081 | void *kbuf, void __user *ubuf) | |
1082 | { | |
1083 | __vector128 vxrs[__NUM_VXRS_HIGH]; | |
1084 | ||
7490daf0 MS |
1085 | if (!MACHINE_HAS_VX) |
1086 | return -ENODEV; | |
b5510d9b HB |
1087 | if (target == current) |
1088 | save_fpu_regs(); | |
1089 | memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs)); | |
1090 | ||
80703617 MS |
1091 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); |
1092 | } | |
1093 | ||
1094 | static int s390_vxrs_high_set(struct task_struct *target, | |
1095 | const struct user_regset *regset, | |
1096 | unsigned int pos, unsigned int count, | |
1097 | const void *kbuf, const void __user *ubuf) | |
1098 | { | |
1099 | int rc; | |
1100 | ||
7490daf0 MS |
1101 | if (!MACHINE_HAS_VX) |
1102 | return -ENODEV; | |
b5510d9b | 1103 | if (target == current) |
d0164ee2 | 1104 | save_fpu_regs(); |
80703617 MS |
1105 | |
1106 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
904818e2 | 1107 | target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1); |
80703617 MS |
1108 | return rc; |
1109 | } | |
1110 | ||
20b40a79 MS |
1111 | static int s390_system_call_get(struct task_struct *target, |
1112 | const struct user_regset *regset, | |
1113 | unsigned int pos, unsigned int count, | |
1114 | void *kbuf, void __user *ubuf) | |
1115 | { | |
f8fc82b4 | 1116 | unsigned int *data = &target->thread.system_call; |
20b40a79 MS |
1117 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
1118 | data, 0, sizeof(unsigned int)); | |
1119 | } | |
1120 | ||
1121 | static int s390_system_call_set(struct task_struct *target, | |
1122 | const struct user_regset *regset, | |
1123 | unsigned int pos, unsigned int count, | |
1124 | const void *kbuf, const void __user *ubuf) | |
1125 | { | |
f8fc82b4 | 1126 | unsigned int *data = &target->thread.system_call; |
20b40a79 MS |
1127 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
1128 | data, 0, sizeof(unsigned int)); | |
1129 | } | |
1130 | ||
63506c41 | 1131 | static const struct user_regset s390_regsets[] = { |
80703617 | 1132 | { |
63506c41 MS |
1133 | .core_note_type = NT_PRSTATUS, |
1134 | .n = sizeof(s390_regs) / sizeof(long), | |
1135 | .size = sizeof(long), | |
1136 | .align = sizeof(long), | |
1137 | .get = s390_regs_get, | |
1138 | .set = s390_regs_set, | |
1139 | }, | |
80703617 | 1140 | { |
63506c41 MS |
1141 | .core_note_type = NT_PRFPREG, |
1142 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
1143 | .size = sizeof(long), | |
1144 | .align = sizeof(long), | |
1145 | .get = s390_fpregs_get, | |
1146 | .set = s390_fpregs_set, | |
1147 | }, | |
80703617 MS |
1148 | { |
1149 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1150 | .n = 1, | |
1151 | .size = sizeof(unsigned int), | |
1152 | .align = sizeof(unsigned int), | |
1153 | .get = s390_system_call_get, | |
1154 | .set = s390_system_call_set, | |
1155 | }, | |
80703617 | 1156 | { |
86f2552b MS |
1157 | .core_note_type = NT_S390_LAST_BREAK, |
1158 | .n = 1, | |
1159 | .size = sizeof(long), | |
1160 | .align = sizeof(long), | |
1161 | .get = s390_last_break_get, | |
b934069c | 1162 | .set = s390_last_break_set, |
86f2552b | 1163 | }, |
80703617 | 1164 | { |
d35339a4 MS |
1165 | .core_note_type = NT_S390_TDB, |
1166 | .n = 1, | |
1167 | .size = 256, | |
1168 | .align = 1, | |
1169 | .get = s390_tdb_get, | |
1170 | .set = s390_tdb_set, | |
1171 | }, | |
80703617 MS |
1172 | { |
1173 | .core_note_type = NT_S390_VXRS_LOW, | |
1174 | .n = __NUM_VXRS_LOW, | |
1175 | .size = sizeof(__u64), | |
1176 | .align = sizeof(__u64), | |
80703617 MS |
1177 | .get = s390_vxrs_low_get, |
1178 | .set = s390_vxrs_low_set, | |
20b40a79 | 1179 | }, |
80703617 MS |
1180 | { |
1181 | .core_note_type = NT_S390_VXRS_HIGH, | |
1182 | .n = __NUM_VXRS_HIGH, | |
1183 | .size = sizeof(__vector128), | |
1184 | .align = sizeof(__vector128), | |
80703617 MS |
1185 | .get = s390_vxrs_high_get, |
1186 | .set = s390_vxrs_high_set, | |
20b40a79 | 1187 | }, |
63506c41 MS |
1188 | }; |
1189 | ||
1190 | static const struct user_regset_view user_s390_view = { | |
1191 | .name = UTS_MACHINE, | |
1192 | .e_machine = EM_S390, | |
1193 | .regsets = s390_regsets, | |
1194 | .n = ARRAY_SIZE(s390_regsets) | |
1195 | }; | |
1196 | ||
1197 | #ifdef CONFIG_COMPAT | |
1198 | static int s390_compat_regs_get(struct task_struct *target, | |
1199 | const struct user_regset *regset, | |
1200 | unsigned int pos, unsigned int count, | |
1201 | void *kbuf, void __user *ubuf) | |
1202 | { | |
1203 | if (target == current) | |
1204 | save_access_regs(target->thread.acrs); | |
1205 | ||
1206 | if (kbuf) { | |
1207 | compat_ulong_t *k = kbuf; | |
1208 | while (count > 0) { | |
1209 | *k++ = __peek_user_compat(target, pos); | |
1210 | count -= sizeof(*k); | |
1211 | pos += sizeof(*k); | |
1212 | } | |
1213 | } else { | |
1214 | compat_ulong_t __user *u = ubuf; | |
1215 | while (count > 0) { | |
1216 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
1217 | return -EFAULT; | |
1218 | count -= sizeof(*u); | |
1219 | pos += sizeof(*u); | |
1220 | } | |
1221 | } | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | static int s390_compat_regs_set(struct task_struct *target, | |
1226 | const struct user_regset *regset, | |
1227 | unsigned int pos, unsigned int count, | |
1228 | const void *kbuf, const void __user *ubuf) | |
1229 | { | |
1230 | int rc = 0; | |
1231 | ||
1232 | if (target == current) | |
1233 | save_access_regs(target->thread.acrs); | |
1234 | ||
1235 | if (kbuf) { | |
1236 | const compat_ulong_t *k = kbuf; | |
1237 | while (count > 0 && !rc) { | |
1238 | rc = __poke_user_compat(target, pos, *k++); | |
1239 | count -= sizeof(*k); | |
1240 | pos += sizeof(*k); | |
1241 | } | |
1242 | } else { | |
1243 | const compat_ulong_t __user *u = ubuf; | |
1244 | while (count > 0 && !rc) { | |
1245 | compat_ulong_t word; | |
1246 | rc = __get_user(word, u++); | |
1247 | if (rc) | |
1248 | break; | |
1249 | rc = __poke_user_compat(target, pos, word); | |
1250 | count -= sizeof(*u); | |
1251 | pos += sizeof(*u); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | if (rc == 0 && target == current) | |
1256 | restore_access_regs(target->thread.acrs); | |
1257 | ||
1258 | return rc; | |
1259 | } | |
1260 | ||
ea2a4d3a HC |
1261 | static int s390_compat_regs_high_get(struct task_struct *target, |
1262 | const struct user_regset *regset, | |
1263 | unsigned int pos, unsigned int count, | |
1264 | void *kbuf, void __user *ubuf) | |
1265 | { | |
1266 | compat_ulong_t *gprs_high; | |
1267 | ||
1268 | gprs_high = (compat_ulong_t *) | |
1269 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1270 | if (kbuf) { | |
1271 | compat_ulong_t *k = kbuf; | |
1272 | while (count > 0) { | |
1273 | *k++ = *gprs_high; | |
1274 | gprs_high += 2; | |
1275 | count -= sizeof(*k); | |
1276 | } | |
1277 | } else { | |
1278 | compat_ulong_t __user *u = ubuf; | |
1279 | while (count > 0) { | |
1280 | if (__put_user(*gprs_high, u++)) | |
1281 | return -EFAULT; | |
1282 | gprs_high += 2; | |
1283 | count -= sizeof(*u); | |
1284 | } | |
1285 | } | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | static int s390_compat_regs_high_set(struct task_struct *target, | |
1290 | const struct user_regset *regset, | |
1291 | unsigned int pos, unsigned int count, | |
1292 | const void *kbuf, const void __user *ubuf) | |
1293 | { | |
1294 | compat_ulong_t *gprs_high; | |
1295 | int rc = 0; | |
1296 | ||
1297 | gprs_high = (compat_ulong_t *) | |
1298 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1299 | if (kbuf) { | |
1300 | const compat_ulong_t *k = kbuf; | |
1301 | while (count > 0) { | |
1302 | *gprs_high = *k++; | |
1303 | *gprs_high += 2; | |
1304 | count -= sizeof(*k); | |
1305 | } | |
1306 | } else { | |
1307 | const compat_ulong_t __user *u = ubuf; | |
1308 | while (count > 0 && !rc) { | |
1309 | unsigned long word; | |
1310 | rc = __get_user(word, u++); | |
1311 | if (rc) | |
1312 | break; | |
1313 | *gprs_high = word; | |
1314 | *gprs_high += 2; | |
1315 | count -= sizeof(*u); | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | return rc; | |
1320 | } | |
1321 | ||
86f2552b MS |
1322 | static int s390_compat_last_break_get(struct task_struct *target, |
1323 | const struct user_regset *regset, | |
1324 | unsigned int pos, unsigned int count, | |
1325 | void *kbuf, void __user *ubuf) | |
1326 | { | |
1327 | compat_ulong_t last_break; | |
1328 | ||
1329 | if (count > 0) { | |
1330 | last_break = task_thread_info(target)->last_break; | |
1331 | if (kbuf) { | |
1332 | unsigned long *k = kbuf; | |
1333 | *k = last_break; | |
1334 | } else { | |
1335 | unsigned long __user *u = ubuf; | |
1336 | if (__put_user(last_break, u)) | |
1337 | return -EFAULT; | |
1338 | } | |
1339 | } | |
1340 | return 0; | |
1341 | } | |
1342 | ||
b934069c MS |
1343 | static int s390_compat_last_break_set(struct task_struct *target, |
1344 | const struct user_regset *regset, | |
1345 | unsigned int pos, unsigned int count, | |
1346 | const void *kbuf, const void __user *ubuf) | |
1347 | { | |
1348 | return 0; | |
1349 | } | |
1350 | ||
63506c41 | 1351 | static const struct user_regset s390_compat_regsets[] = { |
80703617 | 1352 | { |
63506c41 MS |
1353 | .core_note_type = NT_PRSTATUS, |
1354 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
1355 | .size = sizeof(compat_long_t), | |
1356 | .align = sizeof(compat_long_t), | |
1357 | .get = s390_compat_regs_get, | |
1358 | .set = s390_compat_regs_set, | |
1359 | }, | |
80703617 | 1360 | { |
63506c41 MS |
1361 | .core_note_type = NT_PRFPREG, |
1362 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
1363 | .size = sizeof(compat_long_t), | |
1364 | .align = sizeof(compat_long_t), | |
1365 | .get = s390_fpregs_get, | |
1366 | .set = s390_fpregs_set, | |
1367 | }, | |
80703617 MS |
1368 | { |
1369 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1370 | .n = 1, | |
1371 | .size = sizeof(compat_uint_t), | |
1372 | .align = sizeof(compat_uint_t), | |
1373 | .get = s390_system_call_get, | |
1374 | .set = s390_system_call_set, | |
1375 | }, | |
1376 | { | |
86f2552b MS |
1377 | .core_note_type = NT_S390_LAST_BREAK, |
1378 | .n = 1, | |
1379 | .size = sizeof(long), | |
1380 | .align = sizeof(long), | |
1381 | .get = s390_compat_last_break_get, | |
b934069c | 1382 | .set = s390_compat_last_break_set, |
86f2552b | 1383 | }, |
80703617 | 1384 | { |
d35339a4 MS |
1385 | .core_note_type = NT_S390_TDB, |
1386 | .n = 1, | |
1387 | .size = 256, | |
1388 | .align = 1, | |
1389 | .get = s390_tdb_get, | |
1390 | .set = s390_tdb_set, | |
1391 | }, | |
80703617 MS |
1392 | { |
1393 | .core_note_type = NT_S390_VXRS_LOW, | |
1394 | .n = __NUM_VXRS_LOW, | |
1395 | .size = sizeof(__u64), | |
1396 | .align = sizeof(__u64), | |
80703617 MS |
1397 | .get = s390_vxrs_low_get, |
1398 | .set = s390_vxrs_low_set, | |
1399 | }, | |
1400 | { | |
1401 | .core_note_type = NT_S390_VXRS_HIGH, | |
1402 | .n = __NUM_VXRS_HIGH, | |
1403 | .size = sizeof(__vector128), | |
1404 | .align = sizeof(__vector128), | |
80703617 MS |
1405 | .get = s390_vxrs_high_get, |
1406 | .set = s390_vxrs_high_set, | |
20b40a79 | 1407 | }, |
80703617 | 1408 | { |
622e99bf | 1409 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
1410 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
1411 | .size = sizeof(compat_long_t), | |
1412 | .align = sizeof(compat_long_t), | |
1413 | .get = s390_compat_regs_high_get, | |
1414 | .set = s390_compat_regs_high_set, | |
1415 | }, | |
63506c41 MS |
1416 | }; |
1417 | ||
1418 | static const struct user_regset_view user_s390_compat_view = { | |
1419 | .name = "s390", | |
1420 | .e_machine = EM_S390, | |
1421 | .regsets = s390_compat_regsets, | |
1422 | .n = ARRAY_SIZE(s390_compat_regsets) | |
1423 | }; | |
1424 | #endif | |
1425 | ||
1426 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1427 | { | |
1428 | #ifdef CONFIG_COMPAT | |
1429 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
1430 | return &user_s390_compat_view; | |
1431 | #endif | |
1432 | return &user_s390_view; | |
1433 | } | |
952974ac HC |
1434 | |
1435 | static const char *gpr_names[NUM_GPRS] = { | |
1436 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
1437 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
1438 | }; | |
1439 | ||
1440 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1441 | { | |
1442 | if (offset >= NUM_GPRS) | |
1443 | return 0; | |
1444 | return regs->gprs[offset]; | |
1445 | } | |
1446 | ||
1447 | int regs_query_register_offset(const char *name) | |
1448 | { | |
1449 | unsigned long offset; | |
1450 | ||
1451 | if (!name || *name != 'r') | |
1452 | return -EINVAL; | |
958d9072 | 1453 | if (kstrtoul(name + 1, 10, &offset)) |
952974ac HC |
1454 | return -EINVAL; |
1455 | if (offset >= NUM_GPRS) | |
1456 | return -EINVAL; | |
1457 | return offset; | |
1458 | } | |
1459 | ||
1460 | const char *regs_query_register_name(unsigned int offset) | |
1461 | { | |
1462 | if (offset >= NUM_GPRS) | |
1463 | return NULL; | |
1464 | return gpr_names[offset]; | |
1465 | } | |
1466 | ||
1467 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1468 | { | |
1469 | unsigned long ksp = kernel_stack_pointer(regs); | |
1470 | ||
1471 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1472 | } | |
1473 | ||
1474 | /** | |
1475 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1476 | * @regs:pt_regs which contains kernel stack pointer. | |
1477 | * @n:stack entry number. | |
1478 | * | |
1479 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1480 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1481 | * this returns 0. | |
1482 | */ | |
1483 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1484 | { | |
1485 | unsigned long addr; | |
1486 | ||
1487 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1488 | if (!regs_within_kernel_stack(regs, addr)) | |
1489 | return 0; | |
1490 | return *(unsigned long *)addr; | |
1491 | } |