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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fd7b231f AK |
2 | /* |
3 | * Kernel Probes (KProbes) | |
4 | * arch/ia64/kernel/kprobes.c | |
5 | * | |
fd7b231f AK |
6 | * Copyright (C) IBM Corporation, 2002, 2004 |
7 | * Copyright (C) Intel Corporation, 2005 | |
8 | * | |
9 | * 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy | |
10 | * <anil.s.keshavamurthy@intel.com> adapted from i386 | |
11 | */ | |
12 | ||
fd7b231f AK |
13 | #include <linux/kprobes.h> |
14 | #include <linux/ptrace.h> | |
fd7b231f AK |
15 | #include <linux/string.h> |
16 | #include <linux/slab.h> | |
17 | #include <linux/preempt.h> | |
e7088170 | 18 | #include <linux/extable.h> |
1eeb66a1 | 19 | #include <linux/kdebug.h> |
fd7b231f AK |
20 | |
21 | #include <asm/pgtable.h> | |
c7b645f9 | 22 | #include <asm/sections.h> |
82ed1ac9 | 23 | #include <asm/exception.h> |
fd7b231f | 24 | |
8a5c4dc5 AM |
25 | DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; |
26 | DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); | |
fd7b231f | 27 | |
f438d914 MH |
28 | struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; |
29 | ||
fd7b231f AK |
30 | enum instruction_type {A, I, M, F, B, L, X, u}; |
31 | static enum instruction_type bundle_encoding[32][3] = { | |
32 | { M, I, I }, /* 00 */ | |
33 | { M, I, I }, /* 01 */ | |
34 | { M, I, I }, /* 02 */ | |
35 | { M, I, I }, /* 03 */ | |
36 | { M, L, X }, /* 04 */ | |
37 | { M, L, X }, /* 05 */ | |
38 | { u, u, u }, /* 06 */ | |
39 | { u, u, u }, /* 07 */ | |
40 | { M, M, I }, /* 08 */ | |
41 | { M, M, I }, /* 09 */ | |
42 | { M, M, I }, /* 0A */ | |
43 | { M, M, I }, /* 0B */ | |
44 | { M, F, I }, /* 0C */ | |
45 | { M, F, I }, /* 0D */ | |
46 | { M, M, F }, /* 0E */ | |
47 | { M, M, F }, /* 0F */ | |
48 | { M, I, B }, /* 10 */ | |
49 | { M, I, B }, /* 11 */ | |
50 | { M, B, B }, /* 12 */ | |
51 | { M, B, B }, /* 13 */ | |
52 | { u, u, u }, /* 14 */ | |
53 | { u, u, u }, /* 15 */ | |
54 | { B, B, B }, /* 16 */ | |
55 | { B, B, B }, /* 17 */ | |
56 | { M, M, B }, /* 18 */ | |
57 | { M, M, B }, /* 19 */ | |
58 | { u, u, u }, /* 1A */ | |
59 | { u, u, u }, /* 1B */ | |
60 | { M, F, B }, /* 1C */ | |
61 | { M, F, B }, /* 1D */ | |
62 | { u, u, u }, /* 1E */ | |
63 | { u, u, u }, /* 1F */ | |
64 | }; | |
65 | ||
34e1ceb1 MH |
66 | /* Insert a long branch code */ |
67 | static void __kprobes set_brl_inst(void *from, void *to) | |
68 | { | |
69 | s64 rel = ((s64) to - (s64) from) >> 4; | |
70 | bundle_t *brl; | |
71 | brl = (bundle_t *) ((u64) from & ~0xf); | |
72 | brl->quad0.template = 0x05; /* [MLX](stop) */ | |
73 | brl->quad0.slot0 = NOP_M_INST; /* nop.m 0x0 */ | |
74 | brl->quad0.slot1_p0 = ((rel >> 20) & 0x7fffffffff) << 2; | |
75 | brl->quad1.slot1_p1 = (((rel >> 20) & 0x7fffffffff) << 2) >> (64 - 46); | |
76 | /* brl.cond.sptk.many.clr rel<<4 (qp=0) */ | |
77 | brl->quad1.slot2 = BRL_INST(rel >> 59, rel & 0xfffff); | |
78 | } | |
79 | ||
a5403183 AK |
80 | /* |
81 | * In this function we check to see if the instruction | |
82 | * is IP relative instruction and update the kprobe | |
83 | * inst flag accordingly | |
84 | */ | |
1f7ad57b PP |
85 | static void __kprobes update_kprobe_inst_flag(uint template, uint slot, |
86 | uint major_opcode, | |
87 | unsigned long kprobe_inst, | |
88 | struct kprobe *p) | |
fd7b231f | 89 | { |
8bc76772 RL |
90 | p->ainsn.inst_flag = 0; |
91 | p->ainsn.target_br_reg = 0; | |
08ed38b6 | 92 | p->ainsn.slot = slot; |
fd7b231f | 93 | |
deac66ae | 94 | /* Check for Break instruction |
62c27be0 | 95 | * Bits 37:40 Major opcode to be zero |
deac66ae KA |
96 | * Bits 27:32 X6 to be zero |
97 | * Bits 32:35 X3 to be zero | |
98 | */ | |
99 | if ((!major_opcode) && (!((kprobe_inst >> 27) & 0x1FF)) ) { | |
100 | /* is a break instruction */ | |
101 | p->ainsn.inst_flag |= INST_FLAG_BREAK_INST; | |
102 | return; | |
103 | } | |
104 | ||
a5403183 AK |
105 | if (bundle_encoding[template][slot] == B) { |
106 | switch (major_opcode) { | |
107 | case INDIRECT_CALL_OPCODE: | |
108 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
62c27be0 | 109 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); |
110 | break; | |
a5403183 AK |
111 | case IP_RELATIVE_PREDICT_OPCODE: |
112 | case IP_RELATIVE_BRANCH_OPCODE: | |
113 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; | |
62c27be0 | 114 | break; |
a5403183 | 115 | case IP_RELATIVE_CALL_OPCODE: |
62c27be0 | 116 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; |
117 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
118 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
119 | break; | |
a5403183 | 120 | } |
62c27be0 | 121 | } else if (bundle_encoding[template][slot] == X) { |
a5403183 AK |
122 | switch (major_opcode) { |
123 | case LONG_CALL_OPCODE: | |
124 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
125 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
126 | break; | |
127 | } | |
128 | } | |
129 | return; | |
130 | } | |
fd7b231f | 131 | |
1674eafc AK |
132 | /* |
133 | * In this function we check to see if the instruction | |
134 | * (qp) cmpx.crel.ctype p1,p2=r2,r3 | |
135 | * on which we are inserting kprobe is cmp instruction | |
136 | * with ctype as unc. | |
137 | */ | |
1f7ad57b PP |
138 | static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot, |
139 | uint major_opcode, | |
140 | unsigned long kprobe_inst) | |
1674eafc AK |
141 | { |
142 | cmp_inst_t cmp_inst; | |
143 | uint ctype_unc = 0; | |
144 | ||
145 | if (!((bundle_encoding[template][slot] == I) || | |
146 | (bundle_encoding[template][slot] == M))) | |
147 | goto out; | |
148 | ||
149 | if (!((major_opcode == 0xC) || (major_opcode == 0xD) || | |
150 | (major_opcode == 0xE))) | |
151 | goto out; | |
152 | ||
153 | cmp_inst.l = kprobe_inst; | |
154 | if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) { | |
72fdbdce | 155 | /* Integer compare - Register Register (A6 type)*/ |
1674eafc AK |
156 | if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0) |
157 | &&(cmp_inst.f.c == 1)) | |
158 | ctype_unc = 1; | |
159 | } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) { | |
72fdbdce | 160 | /* Integer compare - Immediate Register (A8 type)*/ |
1674eafc AK |
161 | if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1)) |
162 | ctype_unc = 1; | |
163 | } | |
164 | out: | |
165 | return ctype_unc; | |
166 | } | |
167 | ||
df3e0d1c | 168 | /* |
169 | * In this function we check to see if the instruction | |
170 | * on which we are inserting kprobe is supported. | |
171 | * Returns qp value if supported | |
172 | * Returns -EINVAL if unsupported | |
173 | */ | |
174 | static int __kprobes unsupported_inst(uint template, uint slot, | |
175 | uint major_opcode, | |
176 | unsigned long kprobe_inst, | |
177 | unsigned long addr) | |
178 | { | |
179 | int qp; | |
180 | ||
181 | qp = kprobe_inst & 0x3f; | |
182 | if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) { | |
183 | if (slot == 1 && qp) { | |
c2eeb321 JP |
184 | printk(KERN_WARNING "Kprobes on cmp unc " |
185 | "instruction on slot 1 at <0x%lx> " | |
df3e0d1c | 186 | "is not supported\n", addr); |
187 | return -EINVAL; | |
188 | ||
189 | } | |
190 | qp = 0; | |
191 | } | |
192 | else if (bundle_encoding[template][slot] == I) { | |
193 | if (major_opcode == 0) { | |
194 | /* | |
195 | * Check for Integer speculation instruction | |
196 | * - Bit 33-35 to be equal to 0x1 | |
197 | */ | |
198 | if (((kprobe_inst >> 33) & 0x7) == 1) { | |
199 | printk(KERN_WARNING | |
200 | "Kprobes on speculation inst at <0x%lx> not supported\n", | |
201 | addr); | |
202 | return -EINVAL; | |
203 | } | |
204 | /* | |
205 | * IP relative mov instruction | |
206 | * - Bit 27-35 to be equal to 0x30 | |
207 | */ | |
208 | if (((kprobe_inst >> 27) & 0x1FF) == 0x30) { | |
209 | printk(KERN_WARNING | |
210 | "Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n", | |
211 | addr); | |
212 | return -EINVAL; | |
213 | ||
214 | } | |
215 | } | |
216 | else if ((major_opcode == 5) && !(kprobe_inst & (0xFUl << 33)) && | |
217 | (kprobe_inst & (0x1UL << 12))) { | |
218 | /* test bit instructions, tbit,tnat,tf | |
219 | * bit 33-36 to be equal to 0 | |
220 | * bit 12 to be equal to 1 | |
221 | */ | |
222 | if (slot == 1 && qp) { | |
c2eeb321 JP |
223 | printk(KERN_WARNING "Kprobes on test bit " |
224 | "instruction on slot at <0x%lx> " | |
df3e0d1c | 225 | "is not supported\n", addr); |
226 | return -EINVAL; | |
227 | } | |
228 | qp = 0; | |
229 | } | |
230 | } | |
231 | else if (bundle_encoding[template][slot] == B) { | |
232 | if (major_opcode == 7) { | |
233 | /* IP-Relative Predict major code is 7 */ | |
234 | printk(KERN_WARNING "Kprobes on IP-Relative" | |
235 | "Predict is not supported\n"); | |
236 | return -EINVAL; | |
237 | } | |
238 | else if (major_opcode == 2) { | |
239 | /* Indirect Predict, major code is 2 | |
240 | * bit 27-32 to be equal to 10 or 11 | |
241 | */ | |
242 | int x6=(kprobe_inst >> 27) & 0x3F; | |
243 | if ((x6 == 0x10) || (x6 == 0x11)) { | |
c2eeb321 | 244 | printk(KERN_WARNING "Kprobes on " |
df3e0d1c | 245 | "Indirect Predict is not supported\n"); |
246 | return -EINVAL; | |
247 | } | |
248 | } | |
249 | } | |
250 | /* kernel does not use float instruction, here for safety kprobe | |
251 | * will judge whether it is fcmp/flass/float approximation instruction | |
252 | */ | |
253 | else if (unlikely(bundle_encoding[template][slot] == F)) { | |
254 | if ((major_opcode == 4 || major_opcode == 5) && | |
255 | (kprobe_inst & (0x1 << 12))) { | |
256 | /* fcmp/fclass unc instruction */ | |
257 | if (slot == 1 && qp) { | |
258 | printk(KERN_WARNING "Kprobes on fcmp/fclass " | |
259 | "instruction on slot at <0x%lx> " | |
260 | "is not supported\n", addr); | |
261 | return -EINVAL; | |
262 | ||
263 | } | |
264 | qp = 0; | |
265 | } | |
266 | if ((major_opcode == 0 || major_opcode == 1) && | |
267 | (kprobe_inst & (0x1UL << 33))) { | |
268 | /* float Approximation instruction */ | |
269 | if (slot == 1 && qp) { | |
270 | printk(KERN_WARNING "Kprobes on float Approx " | |
271 | "instr at <0x%lx> is not supported\n", | |
272 | addr); | |
273 | return -EINVAL; | |
274 | } | |
275 | qp = 0; | |
276 | } | |
277 | } | |
278 | return qp; | |
279 | } | |
280 | ||
a5403183 AK |
281 | /* |
282 | * In this function we override the bundle with | |
283 | * the break instruction at the given slot. | |
284 | */ | |
1f7ad57b PP |
285 | static void __kprobes prepare_break_inst(uint template, uint slot, |
286 | uint major_opcode, | |
287 | unsigned long kprobe_inst, | |
df3e0d1c | 288 | struct kprobe *p, |
289 | int qp) | |
a5403183 AK |
290 | { |
291 | unsigned long break_inst = BREAK_INST; | |
214ddde2 | 292 | bundle_t *bundle = &p->opcode.bundle; |
a5403183 AK |
293 | |
294 | /* | |
295 | * Copy the original kprobe_inst qualifying predicate(qp) | |
df3e0d1c | 296 | * to the break instruction |
a5403183 | 297 | */ |
df3e0d1c | 298 | break_inst |= qp; |
a5403183 AK |
299 | |
300 | switch (slot) { | |
301 | case 0: | |
302 | bundle->quad0.slot0 = break_inst; | |
303 | break; | |
304 | case 1: | |
305 | bundle->quad0.slot1_p0 = break_inst; | |
306 | bundle->quad1.slot1_p1 = break_inst >> (64-46); | |
307 | break; | |
308 | case 2: | |
309 | bundle->quad1.slot2 = break_inst; | |
310 | break; | |
8bc76772 | 311 | } |
cd2675bf | 312 | |
a5403183 AK |
313 | /* |
314 | * Update the instruction flag, so that we can | |
315 | * emulate the instruction properly after we | |
316 | * single step on original instruction | |
317 | */ | |
318 | update_kprobe_inst_flag(template, slot, major_opcode, kprobe_inst, p); | |
319 | } | |
320 | ||
3ca269d8 | 321 | static void __kprobes get_kprobe_inst(bundle_t *bundle, uint slot, |
a5403183 AK |
322 | unsigned long *kprobe_inst, uint *major_opcode) |
323 | { | |
324 | unsigned long kprobe_inst_p0, kprobe_inst_p1; | |
325 | unsigned int template; | |
326 | ||
327 | template = bundle->quad0.template; | |
fd7b231f | 328 | |
fd7b231f | 329 | switch (slot) { |
a5403183 | 330 | case 0: |
62c27be0 | 331 | *major_opcode = (bundle->quad0.slot0 >> SLOT0_OPCODE_SHIFT); |
332 | *kprobe_inst = bundle->quad0.slot0; | |
333 | break; | |
a5403183 | 334 | case 1: |
62c27be0 | 335 | *major_opcode = (bundle->quad1.slot1_p1 >> SLOT1_p1_OPCODE_SHIFT); |
336 | kprobe_inst_p0 = bundle->quad0.slot1_p0; | |
337 | kprobe_inst_p1 = bundle->quad1.slot1_p1; | |
338 | *kprobe_inst = kprobe_inst_p0 | (kprobe_inst_p1 << (64-46)); | |
fd7b231f | 339 | break; |
a5403183 | 340 | case 2: |
62c27be0 | 341 | *major_opcode = (bundle->quad1.slot2 >> SLOT2_OPCODE_SHIFT); |
342 | *kprobe_inst = bundle->quad1.slot2; | |
fd7b231f AK |
343 | break; |
344 | } | |
a5403183 | 345 | } |
fd7b231f | 346 | |
c7b645f9 | 347 | /* Returns non-zero if the addr is in the Interrupt Vector Table */ |
3ca269d8 | 348 | static int __kprobes in_ivt_functions(unsigned long addr) |
c7b645f9 KA |
349 | { |
350 | return (addr >= (unsigned long)__start_ivt_text | |
351 | && addr < (unsigned long)__end_ivt_text); | |
352 | } | |
353 | ||
1f7ad57b PP |
354 | static int __kprobes valid_kprobe_addr(int template, int slot, |
355 | unsigned long addr) | |
a5403183 AK |
356 | { |
357 | if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) { | |
c7b645f9 KA |
358 | printk(KERN_WARNING "Attempting to insert unaligned kprobe " |
359 | "at 0x%lx\n", addr); | |
a5403183 | 360 | return -EINVAL; |
8bc76772 | 361 | } |
a528e21c | 362 | |
62c27be0 | 363 | if (in_ivt_functions(addr)) { |
364 | printk(KERN_WARNING "Kprobes can't be inserted inside " | |
c7b645f9 | 365 | "IVT functions at 0x%lx\n", addr); |
62c27be0 | 366 | return -EINVAL; |
367 | } | |
c7b645f9 | 368 | |
a5403183 AK |
369 | return 0; |
370 | } | |
371 | ||
3ca269d8 | 372 | static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 373 | { |
cdc7dbdf AK |
374 | unsigned int i; |
375 | i = atomic_add_return(1, &kcb->prev_kprobe_index); | |
376 | kcb->prev_kprobe[i-1].kp = kprobe_running(); | |
377 | kcb->prev_kprobe[i-1].status = kcb->kprobe_status; | |
852caccc AK |
378 | } |
379 | ||
3ca269d8 | 380 | static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 381 | { |
cdc7dbdf | 382 | unsigned int i; |
97075c4b | 383 | i = atomic_read(&kcb->prev_kprobe_index); |
6065a244 | 384 | __this_cpu_write(current_kprobe, kcb->prev_kprobe[i-1].kp); |
97075c4b MH |
385 | kcb->kprobe_status = kcb->prev_kprobe[i-1].status; |
386 | atomic_sub(1, &kcb->prev_kprobe_index); | |
852caccc AK |
387 | } |
388 | ||
3ca269d8 | 389 | static void __kprobes set_current_kprobe(struct kprobe *p, |
8a5c4dc5 | 390 | struct kprobe_ctlblk *kcb) |
852caccc | 391 | { |
6065a244 | 392 | __this_cpu_write(current_kprobe, p); |
852caccc AK |
393 | } |
394 | ||
9508dbfe RL |
395 | static void kretprobe_trampoline(void) |
396 | { | |
397 | } | |
398 | ||
399 | /* | |
400 | * At this point the target function has been tricked into | |
401 | * returning into our trampoline. Lookup the associated instance | |
402 | * and then: | |
403 | * - call the handler function | |
404 | * - cleanup by marking the instance as unused | |
405 | * - long jump back to the original return address | |
406 | */ | |
1f7ad57b | 407 | int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) |
9508dbfe RL |
408 | { |
409 | struct kretprobe_instance *ri = NULL; | |
99219a3f | 410 | struct hlist_head *head, empty_rp; |
b67bfe0d | 411 | struct hlist_node *tmp; |
991a51d8 | 412 | unsigned long flags, orig_ret_address = 0; |
9508dbfe RL |
413 | unsigned long trampoline_address = |
414 | ((struct fnptr *)kretprobe_trampoline)->ip; | |
415 | ||
99219a3f | 416 | INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5 | 417 | kretprobe_hash_lock(current, &head, &flags); |
9508dbfe RL |
418 | |
419 | /* | |
420 | * It is possible to have multiple instances associated with a given | |
421 | * task either because an multiple functions in the call path | |
025dfdaf | 422 | * have a return probe installed on them, and/or more than one return |
9508dbfe RL |
423 | * return probe was registered for a target function. |
424 | * | |
425 | * We can handle this because: | |
426 | * - instances are always inserted at the head of the list | |
427 | * - when multiple return probes are registered for the same | |
428 | * function, the first instance's ret_addr will point to the | |
429 | * real return address, and all the rest will point to | |
430 | * kretprobe_trampoline | |
431 | */ | |
b67bfe0d | 432 | hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
3661999a SL |
433 | if (ri->task != current) |
434 | /* another task is sharing our hash bucket */ | |
435 | continue; | |
436 | ||
437 | orig_ret_address = (unsigned long)ri->ret_addr; | |
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 | ||
447 | regs->cr_iip = orig_ret_address; | |
448 | ||
b67bfe0d | 449 | hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
9138d581 | 450 | if (ri->task != current) |
9508dbfe | 451 | /* another task is sharing our hash bucket */ |
9138d581 | 452 | continue; |
9508dbfe RL |
453 | |
454 | if (ri->rp && ri->rp->handler) | |
455 | ri->rp->handler(ri, regs); | |
456 | ||
457 | orig_ret_address = (unsigned long)ri->ret_addr; | |
99219a3f | 458 | recycle_rp_inst(ri, &empty_rp); |
9508dbfe RL |
459 | |
460 | if (orig_ret_address != trampoline_address) | |
461 | /* | |
462 | * This is the real return address. Any other | |
463 | * instances associated with this task are for | |
464 | * other calls deeper on the call stack | |
465 | */ | |
466 | break; | |
467 | } | |
0f95b7fc AM |
468 | kretprobe_assert(ri, orig_ret_address, trampoline_address); |
469 | ||
ef53d9c5 | 470 | kretprobe_hash_unlock(current, &flags); |
9508dbfe | 471 | |
b67bfe0d | 472 | hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3f | 473 | hlist_del(&ri->hlist); |
474 | kfree(ri); | |
475 | } | |
d217d545 AM |
476 | /* |
477 | * By returning a non-zero value, we are telling | |
478 | * kprobe_handler() that we don't want the post_handler | |
479 | * to run (and have re-enabled preemption) | |
480 | */ | |
9138d581 | 481 | return 1; |
9508dbfe RL |
482 | } |
483 | ||
4c4308cb | 484 | void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, |
1f7ad57b | 485 | struct pt_regs *regs) |
9508dbfe | 486 | { |
4c4308cb | 487 | ri->ret_addr = (kprobe_opcode_t *)regs->b0; |
9508dbfe | 488 | |
4c4308cb CH |
489 | /* Replace the return addr with trampoline addr */ |
490 | regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; | |
9508dbfe RL |
491 | } |
492 | ||
34e1ceb1 MH |
493 | /* Check the instruction in the slot is break */ |
494 | static int __kprobes __is_ia64_break_inst(bundle_t *bundle, uint slot) | |
495 | { | |
496 | unsigned int major_opcode; | |
497 | unsigned int template = bundle->quad0.template; | |
498 | unsigned long kprobe_inst; | |
499 | ||
500 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
501 | if (slot == 1 && bundle_encoding[template][1] == L) | |
502 | slot++; | |
503 | ||
504 | /* Get Kprobe probe instruction at given slot*/ | |
505 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
506 | ||
507 | /* For break instruction, | |
508 | * Bits 37:40 Major opcode to be zero | |
509 | * Bits 27:32 X6 to be zero | |
510 | * Bits 32:35 X3 to be zero | |
511 | */ | |
512 | if (major_opcode || ((kprobe_inst >> 27) & 0x1FF)) { | |
513 | /* Not a break instruction */ | |
514 | return 0; | |
515 | } | |
516 | ||
517 | /* Is a break instruction */ | |
518 | return 1; | |
519 | } | |
520 | ||
521 | /* | |
522 | * In this function, we check whether the target bundle modifies IP or | |
523 | * it triggers an exception. If so, it cannot be boostable. | |
524 | */ | |
525 | static int __kprobes can_boost(bundle_t *bundle, uint slot, | |
526 | unsigned long bundle_addr) | |
527 | { | |
528 | unsigned int template = bundle->quad0.template; | |
529 | ||
530 | do { | |
531 | if (search_exception_tables(bundle_addr + slot) || | |
532 | __is_ia64_break_inst(bundle, slot)) | |
533 | return 0; /* exception may occur in this bundle*/ | |
534 | } while ((++slot) < 3); | |
535 | template &= 0x1e; | |
536 | if (template >= 0x10 /* including B unit */ || | |
537 | template == 0x04 /* including X unit */ || | |
538 | template == 0x06) /* undefined */ | |
539 | return 0; | |
540 | ||
541 | return 1; | |
542 | } | |
543 | ||
544 | /* Prepare long jump bundle and disables other boosters if need */ | |
545 | static void __kprobes prepare_booster(struct kprobe *p) | |
546 | { | |
547 | unsigned long addr = (unsigned long)p->addr & ~0xFULL; | |
548 | unsigned int slot = (unsigned long)p->addr & 0xf; | |
549 | struct kprobe *other_kp; | |
550 | ||
551 | if (can_boost(&p->ainsn.insn[0].bundle, slot, addr)) { | |
552 | set_brl_inst(&p->ainsn.insn[1].bundle, (bundle_t *)addr + 1); | |
553 | p->ainsn.inst_flag |= INST_FLAG_BOOSTABLE; | |
554 | } | |
555 | ||
556 | /* disables boosters in previous slots */ | |
557 | for (; addr < (unsigned long)p->addr; addr++) { | |
558 | other_kp = get_kprobe((void *)addr); | |
559 | if (other_kp) | |
560 | other_kp->ainsn.inst_flag &= ~INST_FLAG_BOOSTABLE; | |
561 | } | |
562 | } | |
563 | ||
1f7ad57b | 564 | int __kprobes arch_prepare_kprobe(struct kprobe *p) |
a5403183 AK |
565 | { |
566 | unsigned long addr = (unsigned long) p->addr; | |
567 | unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL); | |
568 | unsigned long kprobe_inst=0; | |
569 | unsigned int slot = addr & 0xf, template, major_opcode = 0; | |
214ddde2 | 570 | bundle_t *bundle; |
df3e0d1c | 571 | int qp; |
a5403183 | 572 | |
214ddde2 | 573 | bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle; |
62c27be0 | 574 | template = bundle->quad0.template; |
a5403183 AK |
575 | |
576 | if(valid_kprobe_addr(template, slot, addr)) | |
577 | return -EINVAL; | |
578 | ||
579 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
62c27be0 | 580 | if (slot == 1 && bundle_encoding[template][1] == L) |
581 | slot++; | |
a5403183 AK |
582 | |
583 | /* Get kprobe_inst and major_opcode from the bundle */ | |
584 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
585 | ||
df3e0d1c | 586 | qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr); |
587 | if (qp < 0) | |
588 | return -EINVAL; | |
8bc76772 | 589 | |
214ddde2 | 590 | p->ainsn.insn = get_insn_slot(); |
591 | if (!p->ainsn.insn) | |
592 | return -ENOMEM; | |
593 | memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t)); | |
594 | memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t)); | |
8bc76772 | 595 | |
df3e0d1c | 596 | prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp); |
a9ad965e | 597 | |
34e1ceb1 MH |
598 | prepare_booster(p); |
599 | ||
214ddde2 | 600 | return 0; |
a9ad965e | 601 | } |
602 | ||
1f7ad57b | 603 | void __kprobes arch_arm_kprobe(struct kprobe *p) |
8bc76772 | 604 | { |
08ed38b6 TL |
605 | unsigned long arm_addr; |
606 | bundle_t *src, *dest; | |
607 | ||
608 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; | |
609 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
610 | src = &p->opcode.bundle; | |
8bc76772 | 611 | |
214ddde2 | 612 | flush_icache_range((unsigned long)p->ainsn.insn, |
34e1ceb1 MH |
613 | (unsigned long)p->ainsn.insn + |
614 | sizeof(kprobe_opcode_t) * MAX_INSN_SIZE); | |
615 | ||
08ed38b6 TL |
616 | switch (p->ainsn.slot) { |
617 | case 0: | |
618 | dest->quad0.slot0 = src->quad0.slot0; | |
619 | break; | |
620 | case 1: | |
621 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
622 | break; | |
623 | case 2: | |
624 | dest->quad1.slot2 = src->quad1.slot2; | |
625 | break; | |
626 | } | |
214ddde2 | 627 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
628 | } |
629 | ||
1f7ad57b | 630 | void __kprobes arch_disarm_kprobe(struct kprobe *p) |
fd7b231f | 631 | { |
08ed38b6 TL |
632 | unsigned long arm_addr; |
633 | bundle_t *src, *dest; | |
fd7b231f | 634 | |
08ed38b6 TL |
635 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; |
636 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
214ddde2 | 637 | /* p->ainsn.insn contains the original unaltered kprobe_opcode_t */ |
08ed38b6 TL |
638 | src = &p->ainsn.insn->bundle; |
639 | switch (p->ainsn.slot) { | |
640 | case 0: | |
641 | dest->quad0.slot0 = src->quad0.slot0; | |
642 | break; | |
643 | case 1: | |
644 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
645 | break; | |
646 | case 2: | |
647 | dest->quad1.slot2 = src->quad1.slot2; | |
648 | break; | |
649 | } | |
214ddde2 | 650 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
651 | } |
652 | ||
214ddde2 | 653 | void __kprobes arch_remove_kprobe(struct kprobe *p) |
654 | { | |
12941560 MH |
655 | if (p->ainsn.insn) { |
656 | free_insn_slot(p->ainsn.insn, | |
657 | p->ainsn.inst_flag & INST_FLAG_BOOSTABLE); | |
658 | p->ainsn.insn = NULL; | |
659 | } | |
214ddde2 | 660 | } |
fd7b231f AK |
661 | /* |
662 | * We are resuming execution after a single step fault, so the pt_regs | |
663 | * structure reflects the register state after we executed the instruction | |
34e1ceb1 | 664 | * located in the kprobe (p->ainsn.insn->bundle). We still need to adjust |
cd2675bf AK |
665 | * the ip to point back to the original stack address. To set the IP address |
666 | * to original stack address, handle the case where we need to fixup the | |
667 | * relative IP address and/or fixup branch register. | |
fd7b231f | 668 | */ |
1f7ad57b | 669 | static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 670 | { |
62c27be0 | 671 | unsigned long bundle_addr = (unsigned long) (&p->ainsn.insn->bundle); |
672 | unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL; | |
673 | unsigned long template; | |
674 | int slot = ((unsigned long)p->addr & 0xf); | |
fd7b231f | 675 | |
214ddde2 | 676 | template = p->ainsn.insn->bundle.quad0.template; |
cd2675bf | 677 | |
62c27be0 | 678 | if (slot == 1 && bundle_encoding[template][1] == L) |
679 | slot = 2; | |
cd2675bf | 680 | |
34e1ceb1 | 681 | if (p->ainsn.inst_flag & ~INST_FLAG_BOOSTABLE) { |
cd2675bf AK |
682 | |
683 | if (p->ainsn.inst_flag & INST_FLAG_FIX_RELATIVE_IP_ADDR) { | |
684 | /* Fix relative IP address */ | |
62c27be0 | 685 | regs->cr_iip = (regs->cr_iip - bundle_addr) + |
686 | resume_addr; | |
cd2675bf AK |
687 | } |
688 | ||
689 | if (p->ainsn.inst_flag & INST_FLAG_FIX_BRANCH_REG) { | |
690 | /* | |
691 | * Fix target branch register, software convention is | |
692 | * to use either b0 or b6 or b7, so just checking | |
693 | * only those registers | |
694 | */ | |
695 | switch (p->ainsn.target_br_reg) { | |
696 | case 0: | |
697 | if ((regs->b0 == bundle_addr) || | |
698 | (regs->b0 == bundle_addr + 0x10)) { | |
699 | regs->b0 = (regs->b0 - bundle_addr) + | |
700 | resume_addr; | |
701 | } | |
702 | break; | |
703 | case 6: | |
704 | if ((regs->b6 == bundle_addr) || | |
705 | (regs->b6 == bundle_addr + 0x10)) { | |
706 | regs->b6 = (regs->b6 - bundle_addr) + | |
707 | resume_addr; | |
708 | } | |
709 | break; | |
710 | case 7: | |
711 | if ((regs->b7 == bundle_addr) || | |
712 | (regs->b7 == bundle_addr + 0x10)) { | |
713 | regs->b7 = (regs->b7 - bundle_addr) + | |
714 | resume_addr; | |
715 | } | |
716 | break; | |
717 | } /* end switch */ | |
718 | } | |
719 | goto turn_ss_off; | |
720 | } | |
fd7b231f | 721 | |
cd2675bf | 722 | if (slot == 2) { |
62c27be0 | 723 | if (regs->cr_iip == bundle_addr + 0x10) { |
724 | regs->cr_iip = resume_addr + 0x10; | |
725 | } | |
726 | } else { | |
727 | if (regs->cr_iip == bundle_addr) { | |
728 | regs->cr_iip = resume_addr; | |
729 | } | |
a5403183 | 730 | } |
fd7b231f | 731 | |
cd2675bf | 732 | turn_ss_off: |
62c27be0 | 733 | /* Turn off Single Step bit */ |
734 | ia64_psr(regs)->ss = 0; | |
fd7b231f AK |
735 | } |
736 | ||
1f7ad57b | 737 | static void __kprobes prepare_ss(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 738 | { |
214ddde2 | 739 | unsigned long bundle_addr = (unsigned long) &p->ainsn.insn->bundle; |
fd7b231f AK |
740 | unsigned long slot = (unsigned long)p->addr & 0xf; |
741 | ||
deac66ae KA |
742 | /* single step inline if break instruction */ |
743 | if (p->ainsn.inst_flag == INST_FLAG_BREAK_INST) | |
744 | regs->cr_iip = (unsigned long)p->addr & ~0xFULL; | |
745 | else | |
746 | regs->cr_iip = bundle_addr & ~0xFULL; | |
fd7b231f AK |
747 | |
748 | if (slot > 2) | |
749 | slot = 0; | |
750 | ||
751 | ia64_psr(regs)->ri = slot; | |
752 | ||
753 | /* turn on single stepping */ | |
754 | ia64_psr(regs)->ss = 1; | |
755 | } | |
756 | ||
661e5a3d KA |
757 | static int __kprobes is_ia64_break_inst(struct pt_regs *regs) |
758 | { | |
759 | unsigned int slot = ia64_psr(regs)->ri; | |
661e5a3d KA |
760 | unsigned long *kprobe_addr = (unsigned long *)regs->cr_iip; |
761 | bundle_t bundle; | |
762 | ||
763 | memcpy(&bundle, kprobe_addr, sizeof(bundle_t)); | |
661e5a3d | 764 | |
34e1ceb1 | 765 | return __is_ia64_break_inst(&bundle, slot); |
661e5a3d KA |
766 | } |
767 | ||
1f7ad57b | 768 | static int __kprobes pre_kprobes_handler(struct die_args *args) |
fd7b231f AK |
769 | { |
770 | struct kprobe *p; | |
771 | int ret = 0; | |
89cb14c0 | 772 | struct pt_regs *regs = args->regs; |
fd7b231f | 773 | kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs); |
d217d545 AM |
774 | struct kprobe_ctlblk *kcb; |
775 | ||
776 | /* | |
777 | * We don't want to be preempted for the entire | |
778 | * duration of kprobe processing | |
779 | */ | |
780 | preempt_disable(); | |
781 | kcb = get_kprobe_ctlblk(); | |
fd7b231f | 782 | |
fd7b231f AK |
783 | /* Handle recursion cases */ |
784 | if (kprobe_running()) { | |
785 | p = get_kprobe(addr); | |
786 | if (p) { | |
8a5c4dc5 | 787 | if ((kcb->kprobe_status == KPROBE_HIT_SS) && |
deac66ae | 788 | (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)) { |
62c27be0 | 789 | ia64_psr(regs)->ss = 0; |
fd7b231f AK |
790 | goto no_kprobe; |
791 | } | |
852caccc AK |
792 | /* We have reentered the pre_kprobe_handler(), since |
793 | * another probe was hit while within the handler. | |
794 | * We here save the original kprobes variables and | |
795 | * just single step on the instruction of the new probe | |
796 | * without calling any user handlers. | |
797 | */ | |
8a5c4dc5 AM |
798 | save_previous_kprobe(kcb); |
799 | set_current_kprobe(p, kcb); | |
bf8d5c52 | 800 | kprobes_inc_nmissed_count(p); |
852caccc | 801 | prepare_ss(p, regs); |
8a5c4dc5 | 802 | kcb->kprobe_status = KPROBE_REENTER; |
852caccc | 803 | return 1; |
eb3a7292 KA |
804 | } else if (!is_ia64_break_inst(regs)) { |
805 | /* The breakpoint instruction was removed by | |
806 | * another cpu right after we hit, no further | |
807 | * handling of this interrupt is appropriate | |
808 | */ | |
809 | ret = 1; | |
810 | goto no_kprobe; | |
89cb14c0 KA |
811 | } else { |
812 | /* Not our break */ | |
813 | goto no_kprobe; | |
fd7b231f AK |
814 | } |
815 | } | |
816 | ||
fd7b231f AK |
817 | p = get_kprobe(addr); |
818 | if (!p) { | |
661e5a3d KA |
819 | if (!is_ia64_break_inst(regs)) { |
820 | /* | |
821 | * The breakpoint instruction was removed right | |
822 | * after we hit it. Another cpu has removed | |
823 | * either a probepoint or a debugger breakpoint | |
824 | * at this address. In either case, no further | |
825 | * handling of this interrupt is appropriate. | |
826 | */ | |
827 | ret = 1; | |
828 | ||
829 | } | |
830 | ||
831 | /* Not one of our break, let kernel handle it */ | |
fd7b231f AK |
832 | goto no_kprobe; |
833 | } | |
834 | ||
8a5c4dc5 AM |
835 | set_current_kprobe(p, kcb); |
836 | kcb->kprobe_status = KPROBE_HIT_ACTIVE; | |
fd7b231f | 837 | |
cce188bd MH |
838 | if (p->pre_handler && p->pre_handler(p, regs)) { |
839 | reset_current_kprobe(); | |
840 | preempt_enable_no_resched(); | |
fd7b231f | 841 | return 1; |
cce188bd | 842 | } |
fd7b231f | 843 | |
615d0ebb | 844 | #if !defined(CONFIG_PREEMPT) |
34e1ceb1 MH |
845 | if (p->ainsn.inst_flag == INST_FLAG_BOOSTABLE && !p->post_handler) { |
846 | /* Boost up -- we can execute copied instructions directly */ | |
847 | ia64_psr(regs)->ri = p->ainsn.slot; | |
848 | regs->cr_iip = (unsigned long)&p->ainsn.insn->bundle & ~0xFULL; | |
849 | /* turn single stepping off */ | |
850 | ia64_psr(regs)->ss = 0; | |
851 | ||
852 | reset_current_kprobe(); | |
853 | preempt_enable_no_resched(); | |
854 | return 1; | |
855 | } | |
856 | #endif | |
fd7b231f | 857 | prepare_ss(p, regs); |
8a5c4dc5 | 858 | kcb->kprobe_status = KPROBE_HIT_SS; |
fd7b231f AK |
859 | return 1; |
860 | ||
861 | no_kprobe: | |
d217d545 | 862 | preempt_enable_no_resched(); |
fd7b231f AK |
863 | return ret; |
864 | } | |
865 | ||
1f7ad57b | 866 | static int __kprobes post_kprobes_handler(struct pt_regs *regs) |
fd7b231f | 867 | { |
8a5c4dc5 AM |
868 | struct kprobe *cur = kprobe_running(); |
869 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
870 | ||
871 | if (!cur) | |
fd7b231f AK |
872 | return 0; |
873 | ||
8a5c4dc5 AM |
874 | if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) { |
875 | kcb->kprobe_status = KPROBE_HIT_SSDONE; | |
876 | cur->post_handler(cur, regs, 0); | |
852caccc | 877 | } |
fd7b231f | 878 | |
8a5c4dc5 | 879 | resume_execution(cur, regs); |
fd7b231f | 880 | |
852caccc | 881 | /*Restore back the original saved kprobes variables and continue. */ |
8a5c4dc5 AM |
882 | if (kcb->kprobe_status == KPROBE_REENTER) { |
883 | restore_previous_kprobe(kcb); | |
852caccc AK |
884 | goto out; |
885 | } | |
8a5c4dc5 | 886 | reset_current_kprobe(); |
852caccc AK |
887 | |
888 | out: | |
fd7b231f AK |
889 | preempt_enable_no_resched(); |
890 | return 1; | |
891 | } | |
892 | ||
45e18c22 | 893 | int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) |
fd7b231f | 894 | { |
8a5c4dc5 AM |
895 | struct kprobe *cur = kprobe_running(); |
896 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
897 | ||
fd7b231f | 898 | |
c04c1c81 PP |
899 | switch(kcb->kprobe_status) { |
900 | case KPROBE_HIT_SS: | |
901 | case KPROBE_REENTER: | |
902 | /* | |
903 | * We are here because the instruction being single | |
904 | * stepped caused a page fault. We reset the current | |
905 | * kprobe and the instruction pointer points back to | |
906 | * the probe address and allow the page fault handler | |
907 | * to continue as a normal page fault. | |
908 | */ | |
909 | regs->cr_iip = ((unsigned long)cur->addr) & ~0xFULL; | |
910 | ia64_psr(regs)->ri = ((unsigned long)cur->addr) & 0xf; | |
911 | if (kcb->kprobe_status == KPROBE_REENTER) | |
912 | restore_previous_kprobe(kcb); | |
913 | else | |
914 | reset_current_kprobe(); | |
fd7b231f | 915 | preempt_enable_no_resched(); |
c04c1c81 PP |
916 | break; |
917 | case KPROBE_HIT_ACTIVE: | |
918 | case KPROBE_HIT_SSDONE: | |
919 | /* | |
920 | * We increment the nmissed count for accounting, | |
23d6d3db | 921 | * we can also use npre/npostfault count for accounting |
c04c1c81 PP |
922 | * these specific fault cases. |
923 | */ | |
924 | kprobes_inc_nmissed_count(cur); | |
925 | ||
926 | /* | |
927 | * We come here because instructions in the pre/post | |
928 | * handler caused the page_fault, this could happen | |
929 | * if handler tries to access user space by | |
930 | * copy_from_user(), get_user() etc. Let the | |
931 | * user-specified handler try to fix it first. | |
932 | */ | |
933 | if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr)) | |
934 | return 1; | |
fd32cb3a KA |
935 | /* |
936 | * In case the user-specified fault handler returned | |
937 | * zero, try to fix up. | |
938 | */ | |
939 | if (ia64_done_with_exception(regs)) | |
940 | return 1; | |
c04c1c81 PP |
941 | |
942 | /* | |
943 | * Let ia64_do_page_fault() fix it. | |
944 | */ | |
945 | break; | |
946 | default: | |
947 | break; | |
fd7b231f AK |
948 | } |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
1f7ad57b PP |
953 | int __kprobes kprobe_exceptions_notify(struct notifier_block *self, |
954 | unsigned long val, void *data) | |
fd7b231f AK |
955 | { |
956 | struct die_args *args = (struct die_args *)data; | |
66ff2d06 AM |
957 | int ret = NOTIFY_DONE; |
958 | ||
2326c770 | 959 | if (args->regs && user_mode(args->regs)) |
960 | return ret; | |
961 | ||
fd7b231f AK |
962 | switch(val) { |
963 | case DIE_BREAK: | |
9138d581 | 964 | /* err is break number from ia64_bad_break() */ |
08ed38b6 | 965 | if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12) |
08ed38b6 | 966 | || args->err == 0) |
9138d581 KO |
967 | if (pre_kprobes_handler(args)) |
968 | ret = NOTIFY_STOP; | |
fd7b231f | 969 | break; |
9138d581 KO |
970 | case DIE_FAULT: |
971 | /* err is vector number from ia64_fault() */ | |
972 | if (args->err == 36) | |
973 | if (post_kprobes_handler(args->regs)) | |
974 | ret = NOTIFY_STOP; | |
fd7b231f | 975 | break; |
fd7b231f AK |
976 | default: |
977 | break; | |
978 | } | |
66ff2d06 | 979 | return ret; |
fd7b231f AK |
980 | } |
981 | ||
d3ef1f5a ZY |
982 | struct param_bsp_cfm { |
983 | unsigned long ip; | |
984 | unsigned long *bsp; | |
985 | unsigned long cfm; | |
986 | }; | |
987 | ||
988 | static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg) | |
989 | { | |
990 | unsigned long ip; | |
991 | struct param_bsp_cfm *lp = arg; | |
992 | ||
993 | do { | |
994 | unw_get_ip(info, &ip); | |
995 | if (ip == 0) | |
996 | break; | |
997 | if (ip == lp->ip) { | |
998 | unw_get_bsp(info, (unsigned long*)&lp->bsp); | |
999 | unw_get_cfm(info, (unsigned long*)&lp->cfm); | |
1000 | return; | |
1001 | } | |
1002 | } while (unw_unwind(info) >= 0); | |
d61b49c1 | 1003 | lp->bsp = NULL; |
d3ef1f5a ZY |
1004 | lp->cfm = 0; |
1005 | return; | |
1006 | } | |
1007 | ||
3d7e3382 ME |
1008 | unsigned long arch_deref_entry_point(void *entry) |
1009 | { | |
1010 | return ((struct fnptr *)entry)->ip; | |
1011 | } | |
1012 | ||
9508dbfe RL |
1013 | static struct kprobe trampoline_p = { |
1014 | .pre_handler = trampoline_probe_handler | |
1015 | }; | |
1016 | ||
6772926b | 1017 | int __init arch_init_kprobes(void) |
9508dbfe RL |
1018 | { |
1019 | trampoline_p.addr = | |
1020 | (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; | |
1021 | return register_kprobe(&trampoline_p); | |
1022 | } | |
bf8f6e5b AM |
1023 | |
1024 | int __kprobes arch_trampoline_kprobe(struct kprobe *p) | |
1025 | { | |
1026 | if (p->addr == | |
1027 | (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip) | |
1028 | return 1; | |
1029 | ||
1030 | return 0; | |
1031 | } |