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fd7b231f AK |
1 | /* |
2 | * Kernel Probes (KProbes) | |
3 | * arch/ia64/kernel/kprobes.c | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | * | |
19 | * Copyright (C) IBM Corporation, 2002, 2004 | |
20 | * Copyright (C) Intel Corporation, 2005 | |
21 | * | |
22 | * 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy | |
23 | * <anil.s.keshavamurthy@intel.com> adapted from i386 | |
24 | */ | |
25 | ||
fd7b231f AK |
26 | #include <linux/kprobes.h> |
27 | #include <linux/ptrace.h> | |
fd7b231f AK |
28 | #include <linux/string.h> |
29 | #include <linux/slab.h> | |
30 | #include <linux/preempt.h> | |
31 | #include <linux/moduleloader.h> | |
1eeb66a1 | 32 | #include <linux/kdebug.h> |
fd7b231f AK |
33 | |
34 | #include <asm/pgtable.h> | |
c7b645f9 | 35 | #include <asm/sections.h> |
c04c1c81 | 36 | #include <asm/uaccess.h> |
fd7b231f | 37 | |
b2761dc2 AK |
38 | extern void jprobe_inst_return(void); |
39 | ||
8a5c4dc5 AM |
40 | DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; |
41 | DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); | |
fd7b231f AK |
42 | |
43 | enum instruction_type {A, I, M, F, B, L, X, u}; | |
44 | static enum instruction_type bundle_encoding[32][3] = { | |
45 | { M, I, I }, /* 00 */ | |
46 | { M, I, I }, /* 01 */ | |
47 | { M, I, I }, /* 02 */ | |
48 | { M, I, I }, /* 03 */ | |
49 | { M, L, X }, /* 04 */ | |
50 | { M, L, X }, /* 05 */ | |
51 | { u, u, u }, /* 06 */ | |
52 | { u, u, u }, /* 07 */ | |
53 | { M, M, I }, /* 08 */ | |
54 | { M, M, I }, /* 09 */ | |
55 | { M, M, I }, /* 0A */ | |
56 | { M, M, I }, /* 0B */ | |
57 | { M, F, I }, /* 0C */ | |
58 | { M, F, I }, /* 0D */ | |
59 | { M, M, F }, /* 0E */ | |
60 | { M, M, F }, /* 0F */ | |
61 | { M, I, B }, /* 10 */ | |
62 | { M, I, B }, /* 11 */ | |
63 | { M, B, B }, /* 12 */ | |
64 | { M, B, B }, /* 13 */ | |
65 | { u, u, u }, /* 14 */ | |
66 | { u, u, u }, /* 15 */ | |
67 | { B, B, B }, /* 16 */ | |
68 | { B, B, B }, /* 17 */ | |
69 | { M, M, B }, /* 18 */ | |
70 | { M, M, B }, /* 19 */ | |
71 | { u, u, u }, /* 1A */ | |
72 | { u, u, u }, /* 1B */ | |
73 | { M, F, B }, /* 1C */ | |
74 | { M, F, B }, /* 1D */ | |
75 | { u, u, u }, /* 1E */ | |
76 | { u, u, u }, /* 1F */ | |
77 | }; | |
78 | ||
a5403183 AK |
79 | /* |
80 | * In this function we check to see if the instruction | |
81 | * is IP relative instruction and update the kprobe | |
82 | * inst flag accordingly | |
83 | */ | |
1f7ad57b PP |
84 | static void __kprobes update_kprobe_inst_flag(uint template, uint slot, |
85 | uint major_opcode, | |
86 | unsigned long kprobe_inst, | |
87 | struct kprobe *p) | |
fd7b231f | 88 | { |
8bc76772 RL |
89 | p->ainsn.inst_flag = 0; |
90 | p->ainsn.target_br_reg = 0; | |
08ed38b6 | 91 | p->ainsn.slot = slot; |
fd7b231f | 92 | |
deac66ae | 93 | /* Check for Break instruction |
62c27be0 | 94 | * Bits 37:40 Major opcode to be zero |
deac66ae KA |
95 | * Bits 27:32 X6 to be zero |
96 | * Bits 32:35 X3 to be zero | |
97 | */ | |
98 | if ((!major_opcode) && (!((kprobe_inst >> 27) & 0x1FF)) ) { | |
99 | /* is a break instruction */ | |
100 | p->ainsn.inst_flag |= INST_FLAG_BREAK_INST; | |
101 | return; | |
102 | } | |
103 | ||
a5403183 AK |
104 | if (bundle_encoding[template][slot] == B) { |
105 | switch (major_opcode) { | |
106 | case INDIRECT_CALL_OPCODE: | |
107 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
62c27be0 | 108 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); |
109 | break; | |
a5403183 AK |
110 | case IP_RELATIVE_PREDICT_OPCODE: |
111 | case IP_RELATIVE_BRANCH_OPCODE: | |
112 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; | |
62c27be0 | 113 | break; |
a5403183 | 114 | case IP_RELATIVE_CALL_OPCODE: |
62c27be0 | 115 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; |
116 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
117 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
118 | break; | |
a5403183 | 119 | } |
62c27be0 | 120 | } else if (bundle_encoding[template][slot] == X) { |
a5403183 AK |
121 | switch (major_opcode) { |
122 | case LONG_CALL_OPCODE: | |
123 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
124 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
125 | break; | |
126 | } | |
127 | } | |
128 | return; | |
129 | } | |
fd7b231f | 130 | |
1674eafc AK |
131 | /* |
132 | * In this function we check to see if the instruction | |
133 | * (qp) cmpx.crel.ctype p1,p2=r2,r3 | |
134 | * on which we are inserting kprobe is cmp instruction | |
135 | * with ctype as unc. | |
136 | */ | |
1f7ad57b PP |
137 | static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot, |
138 | uint major_opcode, | |
139 | unsigned long kprobe_inst) | |
1674eafc AK |
140 | { |
141 | cmp_inst_t cmp_inst; | |
142 | uint ctype_unc = 0; | |
143 | ||
144 | if (!((bundle_encoding[template][slot] == I) || | |
145 | (bundle_encoding[template][slot] == M))) | |
146 | goto out; | |
147 | ||
148 | if (!((major_opcode == 0xC) || (major_opcode == 0xD) || | |
149 | (major_opcode == 0xE))) | |
150 | goto out; | |
151 | ||
152 | cmp_inst.l = kprobe_inst; | |
153 | if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) { | |
154 | /* Integere compare - Register Register (A6 type)*/ | |
155 | if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0) | |
156 | &&(cmp_inst.f.c == 1)) | |
157 | ctype_unc = 1; | |
158 | } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) { | |
159 | /* Integere compare - Immediate Register (A8 type)*/ | |
160 | if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1)) | |
161 | ctype_unc = 1; | |
162 | } | |
163 | out: | |
164 | return ctype_unc; | |
165 | } | |
166 | ||
df3e0d1c | 167 | /* |
168 | * In this function we check to see if the instruction | |
169 | * on which we are inserting kprobe is supported. | |
170 | * Returns qp value if supported | |
171 | * Returns -EINVAL if unsupported | |
172 | */ | |
173 | static int __kprobes unsupported_inst(uint template, uint slot, | |
174 | uint major_opcode, | |
175 | unsigned long kprobe_inst, | |
176 | unsigned long addr) | |
177 | { | |
178 | int qp; | |
179 | ||
180 | qp = kprobe_inst & 0x3f; | |
181 | if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) { | |
182 | if (slot == 1 && qp) { | |
183 | printk(KERN_WARNING "Kprobes on cmp unc" | |
184 | "instruction on slot 1 at <0x%lx>" | |
185 | "is not supported\n", addr); | |
186 | return -EINVAL; | |
187 | ||
188 | } | |
189 | qp = 0; | |
190 | } | |
191 | else if (bundle_encoding[template][slot] == I) { | |
192 | if (major_opcode == 0) { | |
193 | /* | |
194 | * Check for Integer speculation instruction | |
195 | * - Bit 33-35 to be equal to 0x1 | |
196 | */ | |
197 | if (((kprobe_inst >> 33) & 0x7) == 1) { | |
198 | printk(KERN_WARNING | |
199 | "Kprobes on speculation inst at <0x%lx> not supported\n", | |
200 | addr); | |
201 | return -EINVAL; | |
202 | } | |
203 | /* | |
204 | * IP relative mov instruction | |
205 | * - Bit 27-35 to be equal to 0x30 | |
206 | */ | |
207 | if (((kprobe_inst >> 27) & 0x1FF) == 0x30) { | |
208 | printk(KERN_WARNING | |
209 | "Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n", | |
210 | addr); | |
211 | return -EINVAL; | |
212 | ||
213 | } | |
214 | } | |
215 | else if ((major_opcode == 5) && !(kprobe_inst & (0xFUl << 33)) && | |
216 | (kprobe_inst & (0x1UL << 12))) { | |
217 | /* test bit instructions, tbit,tnat,tf | |
218 | * bit 33-36 to be equal to 0 | |
219 | * bit 12 to be equal to 1 | |
220 | */ | |
221 | if (slot == 1 && qp) { | |
222 | printk(KERN_WARNING "Kprobes on test bit" | |
223 | "instruction on slot at <0x%lx>" | |
224 | "is not supported\n", addr); | |
225 | return -EINVAL; | |
226 | } | |
227 | qp = 0; | |
228 | } | |
229 | } | |
230 | else if (bundle_encoding[template][slot] == B) { | |
231 | if (major_opcode == 7) { | |
232 | /* IP-Relative Predict major code is 7 */ | |
233 | printk(KERN_WARNING "Kprobes on IP-Relative" | |
234 | "Predict is not supported\n"); | |
235 | return -EINVAL; | |
236 | } | |
237 | else if (major_opcode == 2) { | |
238 | /* Indirect Predict, major code is 2 | |
239 | * bit 27-32 to be equal to 10 or 11 | |
240 | */ | |
241 | int x6=(kprobe_inst >> 27) & 0x3F; | |
242 | if ((x6 == 0x10) || (x6 == 0x11)) { | |
243 | printk(KERN_WARNING "Kprobes on" | |
244 | "Indirect Predict is not supported\n"); | |
245 | return -EINVAL; | |
246 | } | |
247 | } | |
248 | } | |
249 | /* kernel does not use float instruction, here for safety kprobe | |
250 | * will judge whether it is fcmp/flass/float approximation instruction | |
251 | */ | |
252 | else if (unlikely(bundle_encoding[template][slot] == F)) { | |
253 | if ((major_opcode == 4 || major_opcode == 5) && | |
254 | (kprobe_inst & (0x1 << 12))) { | |
255 | /* fcmp/fclass unc instruction */ | |
256 | if (slot == 1 && qp) { | |
257 | printk(KERN_WARNING "Kprobes on fcmp/fclass " | |
258 | "instruction on slot at <0x%lx> " | |
259 | "is not supported\n", addr); | |
260 | return -EINVAL; | |
261 | ||
262 | } | |
263 | qp = 0; | |
264 | } | |
265 | if ((major_opcode == 0 || major_opcode == 1) && | |
266 | (kprobe_inst & (0x1UL << 33))) { | |
267 | /* float Approximation instruction */ | |
268 | if (slot == 1 && qp) { | |
269 | printk(KERN_WARNING "Kprobes on float Approx " | |
270 | "instr at <0x%lx> is not supported\n", | |
271 | addr); | |
272 | return -EINVAL; | |
273 | } | |
274 | qp = 0; | |
275 | } | |
276 | } | |
277 | return qp; | |
278 | } | |
279 | ||
a5403183 AK |
280 | /* |
281 | * In this function we override the bundle with | |
282 | * the break instruction at the given slot. | |
283 | */ | |
1f7ad57b PP |
284 | static void __kprobes prepare_break_inst(uint template, uint slot, |
285 | uint major_opcode, | |
286 | unsigned long kprobe_inst, | |
df3e0d1c | 287 | struct kprobe *p, |
288 | int qp) | |
a5403183 AK |
289 | { |
290 | unsigned long break_inst = BREAK_INST; | |
214ddde2 | 291 | bundle_t *bundle = &p->opcode.bundle; |
a5403183 AK |
292 | |
293 | /* | |
294 | * Copy the original kprobe_inst qualifying predicate(qp) | |
df3e0d1c | 295 | * to the break instruction |
a5403183 | 296 | */ |
df3e0d1c | 297 | break_inst |= qp; |
a5403183 AK |
298 | |
299 | switch (slot) { | |
300 | case 0: | |
301 | bundle->quad0.slot0 = break_inst; | |
302 | break; | |
303 | case 1: | |
304 | bundle->quad0.slot1_p0 = break_inst; | |
305 | bundle->quad1.slot1_p1 = break_inst >> (64-46); | |
306 | break; | |
307 | case 2: | |
308 | bundle->quad1.slot2 = break_inst; | |
309 | break; | |
8bc76772 | 310 | } |
cd2675bf | 311 | |
a5403183 AK |
312 | /* |
313 | * Update the instruction flag, so that we can | |
314 | * emulate the instruction properly after we | |
315 | * single step on original instruction | |
316 | */ | |
317 | update_kprobe_inst_flag(template, slot, major_opcode, kprobe_inst, p); | |
318 | } | |
319 | ||
3ca269d8 | 320 | static void __kprobes get_kprobe_inst(bundle_t *bundle, uint slot, |
a5403183 AK |
321 | unsigned long *kprobe_inst, uint *major_opcode) |
322 | { | |
323 | unsigned long kprobe_inst_p0, kprobe_inst_p1; | |
324 | unsigned int template; | |
325 | ||
326 | template = bundle->quad0.template; | |
fd7b231f | 327 | |
fd7b231f | 328 | switch (slot) { |
a5403183 | 329 | case 0: |
62c27be0 | 330 | *major_opcode = (bundle->quad0.slot0 >> SLOT0_OPCODE_SHIFT); |
331 | *kprobe_inst = bundle->quad0.slot0; | |
332 | break; | |
a5403183 | 333 | case 1: |
62c27be0 | 334 | *major_opcode = (bundle->quad1.slot1_p1 >> SLOT1_p1_OPCODE_SHIFT); |
335 | kprobe_inst_p0 = bundle->quad0.slot1_p0; | |
336 | kprobe_inst_p1 = bundle->quad1.slot1_p1; | |
337 | *kprobe_inst = kprobe_inst_p0 | (kprobe_inst_p1 << (64-46)); | |
fd7b231f | 338 | break; |
a5403183 | 339 | case 2: |
62c27be0 | 340 | *major_opcode = (bundle->quad1.slot2 >> SLOT2_OPCODE_SHIFT); |
341 | *kprobe_inst = bundle->quad1.slot2; | |
fd7b231f AK |
342 | break; |
343 | } | |
a5403183 | 344 | } |
fd7b231f | 345 | |
c7b645f9 | 346 | /* Returns non-zero if the addr is in the Interrupt Vector Table */ |
3ca269d8 | 347 | static int __kprobes in_ivt_functions(unsigned long addr) |
c7b645f9 KA |
348 | { |
349 | return (addr >= (unsigned long)__start_ivt_text | |
350 | && addr < (unsigned long)__end_ivt_text); | |
351 | } | |
352 | ||
1f7ad57b PP |
353 | static int __kprobes valid_kprobe_addr(int template, int slot, |
354 | unsigned long addr) | |
a5403183 AK |
355 | { |
356 | if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) { | |
c7b645f9 KA |
357 | printk(KERN_WARNING "Attempting to insert unaligned kprobe " |
358 | "at 0x%lx\n", addr); | |
a5403183 | 359 | return -EINVAL; |
8bc76772 | 360 | } |
a528e21c | 361 | |
62c27be0 | 362 | if (in_ivt_functions(addr)) { |
363 | printk(KERN_WARNING "Kprobes can't be inserted inside " | |
c7b645f9 | 364 | "IVT functions at 0x%lx\n", addr); |
62c27be0 | 365 | return -EINVAL; |
366 | } | |
c7b645f9 | 367 | |
a5403183 AK |
368 | return 0; |
369 | } | |
370 | ||
3ca269d8 | 371 | static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 372 | { |
8a5c4dc5 AM |
373 | kcb->prev_kprobe.kp = kprobe_running(); |
374 | kcb->prev_kprobe.status = kcb->kprobe_status; | |
852caccc AK |
375 | } |
376 | ||
3ca269d8 | 377 | static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 378 | { |
8a5c4dc5 AM |
379 | __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp; |
380 | kcb->kprobe_status = kcb->prev_kprobe.status; | |
852caccc AK |
381 | } |
382 | ||
3ca269d8 | 383 | static void __kprobes set_current_kprobe(struct kprobe *p, |
8a5c4dc5 | 384 | struct kprobe_ctlblk *kcb) |
852caccc | 385 | { |
8a5c4dc5 | 386 | __get_cpu_var(current_kprobe) = p; |
852caccc AK |
387 | } |
388 | ||
9508dbfe RL |
389 | static void kretprobe_trampoline(void) |
390 | { | |
391 | } | |
392 | ||
393 | /* | |
394 | * At this point the target function has been tricked into | |
395 | * returning into our trampoline. Lookup the associated instance | |
396 | * and then: | |
397 | * - call the handler function | |
398 | * - cleanup by marking the instance as unused | |
399 | * - long jump back to the original return address | |
400 | */ | |
1f7ad57b | 401 | int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) |
9508dbfe RL |
402 | { |
403 | struct kretprobe_instance *ri = NULL; | |
99219a3f | 404 | struct hlist_head *head, empty_rp; |
9508dbfe | 405 | struct hlist_node *node, *tmp; |
991a51d8 | 406 | unsigned long flags, orig_ret_address = 0; |
9508dbfe RL |
407 | unsigned long trampoline_address = |
408 | ((struct fnptr *)kretprobe_trampoline)->ip; | |
409 | ||
99219a3f | 410 | INIT_HLIST_HEAD(&empty_rp); |
991a51d8 | 411 | spin_lock_irqsave(&kretprobe_lock, flags); |
9138d581 | 412 | head = kretprobe_inst_table_head(current); |
9508dbfe RL |
413 | |
414 | /* | |
415 | * It is possible to have multiple instances associated with a given | |
416 | * task either because an multiple functions in the call path | |
417 | * have a return probe installed on them, and/or more then one return | |
418 | * return probe was registered for a target function. | |
419 | * | |
420 | * We can handle this because: | |
421 | * - instances are always inserted at the head of the list | |
422 | * - when multiple return probes are registered for the same | |
423 | * function, the first instance's ret_addr will point to the | |
424 | * real return address, and all the rest will point to | |
425 | * kretprobe_trampoline | |
426 | */ | |
427 | hlist_for_each_entry_safe(ri, node, tmp, head, hlist) { | |
9138d581 | 428 | if (ri->task != current) |
9508dbfe | 429 | /* another task is sharing our hash bucket */ |
9138d581 | 430 | continue; |
9508dbfe RL |
431 | |
432 | if (ri->rp && ri->rp->handler) | |
433 | ri->rp->handler(ri, regs); | |
434 | ||
435 | orig_ret_address = (unsigned long)ri->ret_addr; | |
99219a3f | 436 | recycle_rp_inst(ri, &empty_rp); |
9508dbfe RL |
437 | |
438 | if (orig_ret_address != trampoline_address) | |
439 | /* | |
440 | * This is the real return address. Any other | |
441 | * instances associated with this task are for | |
442 | * other calls deeper on the call stack | |
443 | */ | |
444 | break; | |
445 | } | |
446 | ||
0f95b7fc AM |
447 | kretprobe_assert(ri, orig_ret_address, trampoline_address); |
448 | ||
9508dbfe RL |
449 | regs->cr_iip = orig_ret_address; |
450 | ||
8a5c4dc5 | 451 | reset_current_kprobe(); |
991a51d8 | 452 | spin_unlock_irqrestore(&kretprobe_lock, flags); |
9508dbfe RL |
453 | preempt_enable_no_resched(); |
454 | ||
99219a3f | 455 | hlist_for_each_entry_safe(ri, node, tmp, &empty_rp, hlist) { |
456 | hlist_del(&ri->hlist); | |
457 | kfree(ri); | |
458 | } | |
d217d545 AM |
459 | /* |
460 | * By returning a non-zero value, we are telling | |
461 | * kprobe_handler() that we don't want the post_handler | |
462 | * to run (and have re-enabled preemption) | |
463 | */ | |
9138d581 | 464 | return 1; |
9508dbfe RL |
465 | } |
466 | ||
991a51d8 | 467 | /* Called with kretprobe_lock held */ |
4c4308cb | 468 | void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, |
1f7ad57b | 469 | struct pt_regs *regs) |
9508dbfe | 470 | { |
4c4308cb | 471 | ri->ret_addr = (kprobe_opcode_t *)regs->b0; |
9508dbfe | 472 | |
4c4308cb CH |
473 | /* Replace the return addr with trampoline addr */ |
474 | regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; | |
9508dbfe RL |
475 | } |
476 | ||
1f7ad57b | 477 | int __kprobes arch_prepare_kprobe(struct kprobe *p) |
a5403183 AK |
478 | { |
479 | unsigned long addr = (unsigned long) p->addr; | |
480 | unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL); | |
481 | unsigned long kprobe_inst=0; | |
482 | unsigned int slot = addr & 0xf, template, major_opcode = 0; | |
214ddde2 | 483 | bundle_t *bundle; |
df3e0d1c | 484 | int qp; |
a5403183 | 485 | |
214ddde2 | 486 | bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle; |
62c27be0 | 487 | template = bundle->quad0.template; |
a5403183 AK |
488 | |
489 | if(valid_kprobe_addr(template, slot, addr)) | |
490 | return -EINVAL; | |
491 | ||
492 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
62c27be0 | 493 | if (slot == 1 && bundle_encoding[template][1] == L) |
494 | slot++; | |
a5403183 AK |
495 | |
496 | /* Get kprobe_inst and major_opcode from the bundle */ | |
497 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
498 | ||
df3e0d1c | 499 | qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr); |
500 | if (qp < 0) | |
501 | return -EINVAL; | |
8bc76772 | 502 | |
214ddde2 | 503 | p->ainsn.insn = get_insn_slot(); |
504 | if (!p->ainsn.insn) | |
505 | return -ENOMEM; | |
506 | memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t)); | |
507 | memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t)); | |
8bc76772 | 508 | |
df3e0d1c | 509 | prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp); |
a9ad965e | 510 | |
214ddde2 | 511 | return 0; |
a9ad965e | 512 | } |
513 | ||
1f7ad57b | 514 | void __kprobes arch_arm_kprobe(struct kprobe *p) |
8bc76772 | 515 | { |
08ed38b6 TL |
516 | unsigned long arm_addr; |
517 | bundle_t *src, *dest; | |
518 | ||
519 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; | |
520 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
521 | src = &p->opcode.bundle; | |
8bc76772 | 522 | |
214ddde2 | 523 | flush_icache_range((unsigned long)p->ainsn.insn, |
524 | (unsigned long)p->ainsn.insn + sizeof(kprobe_opcode_t)); | |
08ed38b6 TL |
525 | switch (p->ainsn.slot) { |
526 | case 0: | |
527 | dest->quad0.slot0 = src->quad0.slot0; | |
528 | break; | |
529 | case 1: | |
530 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
531 | break; | |
532 | case 2: | |
533 | dest->quad1.slot2 = src->quad1.slot2; | |
534 | break; | |
535 | } | |
214ddde2 | 536 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
537 | } |
538 | ||
1f7ad57b | 539 | void __kprobes arch_disarm_kprobe(struct kprobe *p) |
fd7b231f | 540 | { |
08ed38b6 TL |
541 | unsigned long arm_addr; |
542 | bundle_t *src, *dest; | |
fd7b231f | 543 | |
08ed38b6 TL |
544 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; |
545 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
214ddde2 | 546 | /* p->ainsn.insn contains the original unaltered kprobe_opcode_t */ |
08ed38b6 TL |
547 | src = &p->ainsn.insn->bundle; |
548 | switch (p->ainsn.slot) { | |
549 | case 0: | |
550 | dest->quad0.slot0 = src->quad0.slot0; | |
551 | break; | |
552 | case 1: | |
553 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
554 | break; | |
555 | case 2: | |
556 | dest->quad1.slot2 = src->quad1.slot2; | |
557 | break; | |
558 | } | |
214ddde2 | 559 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
560 | } |
561 | ||
214ddde2 | 562 | void __kprobes arch_remove_kprobe(struct kprobe *p) |
563 | { | |
564 | mutex_lock(&kprobe_mutex); | |
b4c6c34a | 565 | free_insn_slot(p->ainsn.insn, 0); |
214ddde2 | 566 | mutex_unlock(&kprobe_mutex); |
567 | } | |
fd7b231f AK |
568 | /* |
569 | * We are resuming execution after a single step fault, so the pt_regs | |
570 | * structure reflects the register state after we executed the instruction | |
571 | * located in the kprobe (p->ainsn.insn.bundle). We still need to adjust | |
cd2675bf AK |
572 | * the ip to point back to the original stack address. To set the IP address |
573 | * to original stack address, handle the case where we need to fixup the | |
574 | * relative IP address and/or fixup branch register. | |
fd7b231f | 575 | */ |
1f7ad57b | 576 | static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 577 | { |
62c27be0 | 578 | unsigned long bundle_addr = (unsigned long) (&p->ainsn.insn->bundle); |
579 | unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL; | |
580 | unsigned long template; | |
581 | int slot = ((unsigned long)p->addr & 0xf); | |
fd7b231f | 582 | |
214ddde2 | 583 | template = p->ainsn.insn->bundle.quad0.template; |
cd2675bf | 584 | |
62c27be0 | 585 | if (slot == 1 && bundle_encoding[template][1] == L) |
586 | slot = 2; | |
cd2675bf AK |
587 | |
588 | if (p->ainsn.inst_flag) { | |
589 | ||
590 | if (p->ainsn.inst_flag & INST_FLAG_FIX_RELATIVE_IP_ADDR) { | |
591 | /* Fix relative IP address */ | |
62c27be0 | 592 | regs->cr_iip = (regs->cr_iip - bundle_addr) + |
593 | resume_addr; | |
cd2675bf AK |
594 | } |
595 | ||
596 | if (p->ainsn.inst_flag & INST_FLAG_FIX_BRANCH_REG) { | |
597 | /* | |
598 | * Fix target branch register, software convention is | |
599 | * to use either b0 or b6 or b7, so just checking | |
600 | * only those registers | |
601 | */ | |
602 | switch (p->ainsn.target_br_reg) { | |
603 | case 0: | |
604 | if ((regs->b0 == bundle_addr) || | |
605 | (regs->b0 == bundle_addr + 0x10)) { | |
606 | regs->b0 = (regs->b0 - bundle_addr) + | |
607 | resume_addr; | |
608 | } | |
609 | break; | |
610 | case 6: | |
611 | if ((regs->b6 == bundle_addr) || | |
612 | (regs->b6 == bundle_addr + 0x10)) { | |
613 | regs->b6 = (regs->b6 - bundle_addr) + | |
614 | resume_addr; | |
615 | } | |
616 | break; | |
617 | case 7: | |
618 | if ((regs->b7 == bundle_addr) || | |
619 | (regs->b7 == bundle_addr + 0x10)) { | |
620 | regs->b7 = (regs->b7 - bundle_addr) + | |
621 | resume_addr; | |
622 | } | |
623 | break; | |
624 | } /* end switch */ | |
625 | } | |
626 | goto turn_ss_off; | |
627 | } | |
fd7b231f | 628 | |
cd2675bf | 629 | if (slot == 2) { |
62c27be0 | 630 | if (regs->cr_iip == bundle_addr + 0x10) { |
631 | regs->cr_iip = resume_addr + 0x10; | |
632 | } | |
633 | } else { | |
634 | if (regs->cr_iip == bundle_addr) { | |
635 | regs->cr_iip = resume_addr; | |
636 | } | |
a5403183 | 637 | } |
fd7b231f | 638 | |
cd2675bf | 639 | turn_ss_off: |
62c27be0 | 640 | /* Turn off Single Step bit */ |
641 | ia64_psr(regs)->ss = 0; | |
fd7b231f AK |
642 | } |
643 | ||
1f7ad57b | 644 | static void __kprobes prepare_ss(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 645 | { |
214ddde2 | 646 | unsigned long bundle_addr = (unsigned long) &p->ainsn.insn->bundle; |
fd7b231f AK |
647 | unsigned long slot = (unsigned long)p->addr & 0xf; |
648 | ||
deac66ae KA |
649 | /* single step inline if break instruction */ |
650 | if (p->ainsn.inst_flag == INST_FLAG_BREAK_INST) | |
651 | regs->cr_iip = (unsigned long)p->addr & ~0xFULL; | |
652 | else | |
653 | regs->cr_iip = bundle_addr & ~0xFULL; | |
fd7b231f AK |
654 | |
655 | if (slot > 2) | |
656 | slot = 0; | |
657 | ||
658 | ia64_psr(regs)->ri = slot; | |
659 | ||
660 | /* turn on single stepping */ | |
661 | ia64_psr(regs)->ss = 1; | |
662 | } | |
663 | ||
661e5a3d KA |
664 | static int __kprobes is_ia64_break_inst(struct pt_regs *regs) |
665 | { | |
666 | unsigned int slot = ia64_psr(regs)->ri; | |
667 | unsigned int template, major_opcode; | |
668 | unsigned long kprobe_inst; | |
669 | unsigned long *kprobe_addr = (unsigned long *)regs->cr_iip; | |
670 | bundle_t bundle; | |
671 | ||
672 | memcpy(&bundle, kprobe_addr, sizeof(bundle_t)); | |
673 | template = bundle.quad0.template; | |
674 | ||
675 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
676 | if (slot == 1 && bundle_encoding[template][1] == L) | |
62c27be0 | 677 | slot++; |
661e5a3d KA |
678 | |
679 | /* Get Kprobe probe instruction at given slot*/ | |
680 | get_kprobe_inst(&bundle, slot, &kprobe_inst, &major_opcode); | |
681 | ||
682 | /* For break instruction, | |
683 | * Bits 37:40 Major opcode to be zero | |
684 | * Bits 27:32 X6 to be zero | |
685 | * Bits 32:35 X3 to be zero | |
686 | */ | |
687 | if (major_opcode || ((kprobe_inst >> 27) & 0x1FF) ) { | |
688 | /* Not a break instruction */ | |
689 | return 0; | |
690 | } | |
691 | ||
692 | /* Is a break instruction */ | |
693 | return 1; | |
694 | } | |
695 | ||
1f7ad57b | 696 | static int __kprobes pre_kprobes_handler(struct die_args *args) |
fd7b231f AK |
697 | { |
698 | struct kprobe *p; | |
699 | int ret = 0; | |
89cb14c0 | 700 | struct pt_regs *regs = args->regs; |
fd7b231f | 701 | kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs); |
d217d545 AM |
702 | struct kprobe_ctlblk *kcb; |
703 | ||
704 | /* | |
705 | * We don't want to be preempted for the entire | |
706 | * duration of kprobe processing | |
707 | */ | |
708 | preempt_disable(); | |
709 | kcb = get_kprobe_ctlblk(); | |
fd7b231f | 710 | |
fd7b231f AK |
711 | /* Handle recursion cases */ |
712 | if (kprobe_running()) { | |
713 | p = get_kprobe(addr); | |
714 | if (p) { | |
8a5c4dc5 | 715 | if ((kcb->kprobe_status == KPROBE_HIT_SS) && |
deac66ae | 716 | (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)) { |
62c27be0 | 717 | ia64_psr(regs)->ss = 0; |
fd7b231f AK |
718 | goto no_kprobe; |
719 | } | |
852caccc AK |
720 | /* We have reentered the pre_kprobe_handler(), since |
721 | * another probe was hit while within the handler. | |
722 | * We here save the original kprobes variables and | |
723 | * just single step on the instruction of the new probe | |
724 | * without calling any user handlers. | |
725 | */ | |
8a5c4dc5 AM |
726 | save_previous_kprobe(kcb); |
727 | set_current_kprobe(p, kcb); | |
bf8d5c52 | 728 | kprobes_inc_nmissed_count(p); |
852caccc | 729 | prepare_ss(p, regs); |
8a5c4dc5 | 730 | kcb->kprobe_status = KPROBE_REENTER; |
852caccc | 731 | return 1; |
89cb14c0 | 732 | } else if (args->err == __IA64_BREAK_JPROBE) { |
fd7b231f AK |
733 | /* |
734 | * jprobe instrumented function just completed | |
735 | */ | |
8a5c4dc5 | 736 | p = __get_cpu_var(current_kprobe); |
fd7b231f AK |
737 | if (p->break_handler && p->break_handler(p, regs)) { |
738 | goto ss_probe; | |
739 | } | |
eb3a7292 KA |
740 | } else if (!is_ia64_break_inst(regs)) { |
741 | /* The breakpoint instruction was removed by | |
742 | * another cpu right after we hit, no further | |
743 | * handling of this interrupt is appropriate | |
744 | */ | |
745 | ret = 1; | |
746 | goto no_kprobe; | |
89cb14c0 KA |
747 | } else { |
748 | /* Not our break */ | |
749 | goto no_kprobe; | |
fd7b231f AK |
750 | } |
751 | } | |
752 | ||
fd7b231f AK |
753 | p = get_kprobe(addr); |
754 | if (!p) { | |
661e5a3d KA |
755 | if (!is_ia64_break_inst(regs)) { |
756 | /* | |
757 | * The breakpoint instruction was removed right | |
758 | * after we hit it. Another cpu has removed | |
759 | * either a probepoint or a debugger breakpoint | |
760 | * at this address. In either case, no further | |
761 | * handling of this interrupt is appropriate. | |
762 | */ | |
763 | ret = 1; | |
764 | ||
765 | } | |
766 | ||
767 | /* Not one of our break, let kernel handle it */ | |
fd7b231f AK |
768 | goto no_kprobe; |
769 | } | |
770 | ||
8a5c4dc5 AM |
771 | set_current_kprobe(p, kcb); |
772 | kcb->kprobe_status = KPROBE_HIT_ACTIVE; | |
fd7b231f AK |
773 | |
774 | if (p->pre_handler && p->pre_handler(p, regs)) | |
775 | /* | |
776 | * Our pre-handler is specifically requesting that we just | |
9508dbfe RL |
777 | * do a return. This is used for both the jprobe pre-handler |
778 | * and the kretprobe trampoline | |
fd7b231f AK |
779 | */ |
780 | return 1; | |
781 | ||
782 | ss_probe: | |
783 | prepare_ss(p, regs); | |
8a5c4dc5 | 784 | kcb->kprobe_status = KPROBE_HIT_SS; |
fd7b231f AK |
785 | return 1; |
786 | ||
787 | no_kprobe: | |
d217d545 | 788 | preempt_enable_no_resched(); |
fd7b231f AK |
789 | return ret; |
790 | } | |
791 | ||
1f7ad57b | 792 | static int __kprobes post_kprobes_handler(struct pt_regs *regs) |
fd7b231f | 793 | { |
8a5c4dc5 AM |
794 | struct kprobe *cur = kprobe_running(); |
795 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
796 | ||
797 | if (!cur) | |
fd7b231f AK |
798 | return 0; |
799 | ||
8a5c4dc5 AM |
800 | if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) { |
801 | kcb->kprobe_status = KPROBE_HIT_SSDONE; | |
802 | cur->post_handler(cur, regs, 0); | |
852caccc | 803 | } |
fd7b231f | 804 | |
8a5c4dc5 | 805 | resume_execution(cur, regs); |
fd7b231f | 806 | |
852caccc | 807 | /*Restore back the original saved kprobes variables and continue. */ |
8a5c4dc5 AM |
808 | if (kcb->kprobe_status == KPROBE_REENTER) { |
809 | restore_previous_kprobe(kcb); | |
852caccc AK |
810 | goto out; |
811 | } | |
8a5c4dc5 | 812 | reset_current_kprobe(); |
852caccc AK |
813 | |
814 | out: | |
fd7b231f AK |
815 | preempt_enable_no_resched(); |
816 | return 1; | |
817 | } | |
818 | ||
1f7ad57b | 819 | static int __kprobes kprobes_fault_handler(struct pt_regs *regs, int trapnr) |
fd7b231f | 820 | { |
8a5c4dc5 AM |
821 | struct kprobe *cur = kprobe_running(); |
822 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
823 | ||
fd7b231f | 824 | |
c04c1c81 PP |
825 | switch(kcb->kprobe_status) { |
826 | case KPROBE_HIT_SS: | |
827 | case KPROBE_REENTER: | |
828 | /* | |
829 | * We are here because the instruction being single | |
830 | * stepped caused a page fault. We reset the current | |
831 | * kprobe and the instruction pointer points back to | |
832 | * the probe address and allow the page fault handler | |
833 | * to continue as a normal page fault. | |
834 | */ | |
835 | regs->cr_iip = ((unsigned long)cur->addr) & ~0xFULL; | |
836 | ia64_psr(regs)->ri = ((unsigned long)cur->addr) & 0xf; | |
837 | if (kcb->kprobe_status == KPROBE_REENTER) | |
838 | restore_previous_kprobe(kcb); | |
839 | else | |
840 | reset_current_kprobe(); | |
fd7b231f | 841 | preempt_enable_no_resched(); |
c04c1c81 PP |
842 | break; |
843 | case KPROBE_HIT_ACTIVE: | |
844 | case KPROBE_HIT_SSDONE: | |
845 | /* | |
846 | * We increment the nmissed count for accounting, | |
847 | * we can also use npre/npostfault count for accouting | |
848 | * these specific fault cases. | |
849 | */ | |
850 | kprobes_inc_nmissed_count(cur); | |
851 | ||
852 | /* | |
853 | * We come here because instructions in the pre/post | |
854 | * handler caused the page_fault, this could happen | |
855 | * if handler tries to access user space by | |
856 | * copy_from_user(), get_user() etc. Let the | |
857 | * user-specified handler try to fix it first. | |
858 | */ | |
859 | if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr)) | |
860 | return 1; | |
fd32cb3a KA |
861 | /* |
862 | * In case the user-specified fault handler returned | |
863 | * zero, try to fix up. | |
864 | */ | |
865 | if (ia64_done_with_exception(regs)) | |
866 | return 1; | |
c04c1c81 PP |
867 | |
868 | /* | |
869 | * Let ia64_do_page_fault() fix it. | |
870 | */ | |
871 | break; | |
872 | default: | |
873 | break; | |
fd7b231f AK |
874 | } |
875 | ||
876 | return 0; | |
877 | } | |
878 | ||
1f7ad57b PP |
879 | int __kprobes kprobe_exceptions_notify(struct notifier_block *self, |
880 | unsigned long val, void *data) | |
fd7b231f AK |
881 | { |
882 | struct die_args *args = (struct die_args *)data; | |
66ff2d06 AM |
883 | int ret = NOTIFY_DONE; |
884 | ||
2326c770 | 885 | if (args->regs && user_mode(args->regs)) |
886 | return ret; | |
887 | ||
fd7b231f AK |
888 | switch(val) { |
889 | case DIE_BREAK: | |
9138d581 | 890 | /* err is break number from ia64_bad_break() */ |
08ed38b6 TL |
891 | if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12) |
892 | || args->err == __IA64_BREAK_JPROBE | |
893 | || args->err == 0) | |
9138d581 KO |
894 | if (pre_kprobes_handler(args)) |
895 | ret = NOTIFY_STOP; | |
fd7b231f | 896 | break; |
9138d581 KO |
897 | case DIE_FAULT: |
898 | /* err is vector number from ia64_fault() */ | |
899 | if (args->err == 36) | |
900 | if (post_kprobes_handler(args->regs)) | |
901 | ret = NOTIFY_STOP; | |
fd7b231f AK |
902 | break; |
903 | case DIE_PAGE_FAULT: | |
d217d545 AM |
904 | /* kprobe_running() needs smp_processor_id() */ |
905 | preempt_disable(); | |
906 | if (kprobe_running() && | |
907 | kprobes_fault_handler(args->regs, args->trapnr)) | |
66ff2d06 | 908 | ret = NOTIFY_STOP; |
d217d545 | 909 | preempt_enable(); |
fd7b231f AK |
910 | default: |
911 | break; | |
912 | } | |
66ff2d06 | 913 | return ret; |
fd7b231f AK |
914 | } |
915 | ||
d3ef1f5a ZY |
916 | struct param_bsp_cfm { |
917 | unsigned long ip; | |
918 | unsigned long *bsp; | |
919 | unsigned long cfm; | |
920 | }; | |
921 | ||
922 | static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg) | |
923 | { | |
924 | unsigned long ip; | |
925 | struct param_bsp_cfm *lp = arg; | |
926 | ||
927 | do { | |
928 | unw_get_ip(info, &ip); | |
929 | if (ip == 0) | |
930 | break; | |
931 | if (ip == lp->ip) { | |
932 | unw_get_bsp(info, (unsigned long*)&lp->bsp); | |
933 | unw_get_cfm(info, (unsigned long*)&lp->cfm); | |
934 | return; | |
935 | } | |
936 | } while (unw_unwind(info) >= 0); | |
d61b49c1 | 937 | lp->bsp = NULL; |
d3ef1f5a ZY |
938 | lp->cfm = 0; |
939 | return; | |
940 | } | |
941 | ||
1f7ad57b | 942 | int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 943 | { |
b2761dc2 AK |
944 | struct jprobe *jp = container_of(p, struct jprobe, kp); |
945 | unsigned long addr = ((struct fnptr *)(jp->entry))->ip; | |
8a5c4dc5 | 946 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); |
d3ef1f5a ZY |
947 | struct param_bsp_cfm pa; |
948 | int bytes; | |
949 | ||
950 | /* | |
951 | * Callee owns the argument space and could overwrite it, eg | |
952 | * tail call optimization. So to be absolutely safe | |
953 | * we save the argument space before transfering the control | |
954 | * to instrumented jprobe function which runs in | |
955 | * the process context | |
956 | */ | |
957 | pa.ip = regs->cr_iip; | |
958 | unw_init_running(ia64_get_bsp_cfm, &pa); | |
959 | bytes = (char *)ia64_rse_skip_regs(pa.bsp, pa.cfm & 0x3f) | |
960 | - (char *)pa.bsp; | |
961 | memcpy( kcb->jprobes_saved_stacked_regs, | |
962 | pa.bsp, | |
963 | bytes ); | |
964 | kcb->bsp = pa.bsp; | |
965 | kcb->cfm = pa.cfm; | |
fd7b231f | 966 | |
b2761dc2 | 967 | /* save architectural state */ |
8a5c4dc5 | 968 | kcb->jprobe_saved_regs = *regs; |
b2761dc2 AK |
969 | |
970 | /* after rfi, execute the jprobe instrumented function */ | |
971 | regs->cr_iip = addr & ~0xFULL; | |
972 | ia64_psr(regs)->ri = addr & 0xf; | |
973 | regs->r1 = ((struct fnptr *)(jp->entry))->gp; | |
974 | ||
975 | /* | |
976 | * fix the return address to our jprobe_inst_return() function | |
977 | * in the jprobes.S file | |
978 | */ | |
62c27be0 | 979 | regs->b0 = ((struct fnptr *)(jprobe_inst_return))->ip; |
b2761dc2 AK |
980 | |
981 | return 1; | |
fd7b231f AK |
982 | } |
983 | ||
1f7ad57b | 984 | int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 985 | { |
8a5c4dc5 | 986 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); |
d3ef1f5a | 987 | int bytes; |
8a5c4dc5 | 988 | |
d3ef1f5a | 989 | /* restoring architectural state */ |
8a5c4dc5 | 990 | *regs = kcb->jprobe_saved_regs; |
d3ef1f5a ZY |
991 | |
992 | /* restoring the original argument space */ | |
993 | flush_register_stack(); | |
994 | bytes = (char *)ia64_rse_skip_regs(kcb->bsp, kcb->cfm & 0x3f) | |
995 | - (char *)kcb->bsp; | |
996 | memcpy( kcb->bsp, | |
997 | kcb->jprobes_saved_stacked_regs, | |
998 | bytes ); | |
999 | invalidate_stacked_regs(); | |
1000 | ||
d217d545 | 1001 | preempt_enable_no_resched(); |
b2761dc2 | 1002 | return 1; |
fd7b231f | 1003 | } |
9508dbfe RL |
1004 | |
1005 | static struct kprobe trampoline_p = { | |
1006 | .pre_handler = trampoline_probe_handler | |
1007 | }; | |
1008 | ||
6772926b | 1009 | int __init arch_init_kprobes(void) |
9508dbfe RL |
1010 | { |
1011 | trampoline_p.addr = | |
1012 | (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; | |
1013 | return register_kprobe(&trampoline_p); | |
1014 | } |