Commit | Line | Data |
---|---|---|
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> | |
e7088170 | 31 | #include <linux/extable.h> |
1eeb66a1 | 32 | #include <linux/kdebug.h> |
fd7b231f AK |
33 | |
34 | #include <asm/pgtable.h> | |
c7b645f9 | 35 | #include <asm/sections.h> |
82ed1ac9 | 36 | #include <asm/exception.h> |
fd7b231f | 37 | |
8a5c4dc5 AM |
38 | DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL; |
39 | DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk); | |
fd7b231f | 40 | |
f438d914 MH |
41 | struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; |
42 | ||
fd7b231f AK |
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 | ||
34e1ceb1 MH |
79 | /* Insert a long branch code */ |
80 | static void __kprobes set_brl_inst(void *from, void *to) | |
81 | { | |
82 | s64 rel = ((s64) to - (s64) from) >> 4; | |
83 | bundle_t *brl; | |
84 | brl = (bundle_t *) ((u64) from & ~0xf); | |
85 | brl->quad0.template = 0x05; /* [MLX](stop) */ | |
86 | brl->quad0.slot0 = NOP_M_INST; /* nop.m 0x0 */ | |
87 | brl->quad0.slot1_p0 = ((rel >> 20) & 0x7fffffffff) << 2; | |
88 | brl->quad1.slot1_p1 = (((rel >> 20) & 0x7fffffffff) << 2) >> (64 - 46); | |
89 | /* brl.cond.sptk.many.clr rel<<4 (qp=0) */ | |
90 | brl->quad1.slot2 = BRL_INST(rel >> 59, rel & 0xfffff); | |
91 | } | |
92 | ||
a5403183 AK |
93 | /* |
94 | * In this function we check to see if the instruction | |
95 | * is IP relative instruction and update the kprobe | |
96 | * inst flag accordingly | |
97 | */ | |
1f7ad57b PP |
98 | static void __kprobes update_kprobe_inst_flag(uint template, uint slot, |
99 | uint major_opcode, | |
100 | unsigned long kprobe_inst, | |
101 | struct kprobe *p) | |
fd7b231f | 102 | { |
8bc76772 RL |
103 | p->ainsn.inst_flag = 0; |
104 | p->ainsn.target_br_reg = 0; | |
08ed38b6 | 105 | p->ainsn.slot = slot; |
fd7b231f | 106 | |
deac66ae | 107 | /* Check for Break instruction |
62c27be0 | 108 | * Bits 37:40 Major opcode to be zero |
deac66ae KA |
109 | * Bits 27:32 X6 to be zero |
110 | * Bits 32:35 X3 to be zero | |
111 | */ | |
112 | if ((!major_opcode) && (!((kprobe_inst >> 27) & 0x1FF)) ) { | |
113 | /* is a break instruction */ | |
114 | p->ainsn.inst_flag |= INST_FLAG_BREAK_INST; | |
115 | return; | |
116 | } | |
117 | ||
a5403183 AK |
118 | if (bundle_encoding[template][slot] == B) { |
119 | switch (major_opcode) { | |
120 | case INDIRECT_CALL_OPCODE: | |
121 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
62c27be0 | 122 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); |
123 | break; | |
a5403183 AK |
124 | case IP_RELATIVE_PREDICT_OPCODE: |
125 | case IP_RELATIVE_BRANCH_OPCODE: | |
126 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; | |
62c27be0 | 127 | break; |
a5403183 | 128 | case IP_RELATIVE_CALL_OPCODE: |
62c27be0 | 129 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; |
130 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
131 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
132 | break; | |
a5403183 | 133 | } |
62c27be0 | 134 | } else if (bundle_encoding[template][slot] == X) { |
a5403183 AK |
135 | switch (major_opcode) { |
136 | case LONG_CALL_OPCODE: | |
137 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
138 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
139 | break; | |
140 | } | |
141 | } | |
142 | return; | |
143 | } | |
fd7b231f | 144 | |
1674eafc AK |
145 | /* |
146 | * In this function we check to see if the instruction | |
147 | * (qp) cmpx.crel.ctype p1,p2=r2,r3 | |
148 | * on which we are inserting kprobe is cmp instruction | |
149 | * with ctype as unc. | |
150 | */ | |
1f7ad57b PP |
151 | static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot, |
152 | uint major_opcode, | |
153 | unsigned long kprobe_inst) | |
1674eafc AK |
154 | { |
155 | cmp_inst_t cmp_inst; | |
156 | uint ctype_unc = 0; | |
157 | ||
158 | if (!((bundle_encoding[template][slot] == I) || | |
159 | (bundle_encoding[template][slot] == M))) | |
160 | goto out; | |
161 | ||
162 | if (!((major_opcode == 0xC) || (major_opcode == 0xD) || | |
163 | (major_opcode == 0xE))) | |
164 | goto out; | |
165 | ||
166 | cmp_inst.l = kprobe_inst; | |
167 | if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) { | |
72fdbdce | 168 | /* Integer compare - Register Register (A6 type)*/ |
1674eafc AK |
169 | if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0) |
170 | &&(cmp_inst.f.c == 1)) | |
171 | ctype_unc = 1; | |
172 | } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) { | |
72fdbdce | 173 | /* Integer compare - Immediate Register (A8 type)*/ |
1674eafc AK |
174 | if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1)) |
175 | ctype_unc = 1; | |
176 | } | |
177 | out: | |
178 | return ctype_unc; | |
179 | } | |
180 | ||
df3e0d1c | 181 | /* |
182 | * In this function we check to see if the instruction | |
183 | * on which we are inserting kprobe is supported. | |
184 | * Returns qp value if supported | |
185 | * Returns -EINVAL if unsupported | |
186 | */ | |
187 | static int __kprobes unsupported_inst(uint template, uint slot, | |
188 | uint major_opcode, | |
189 | unsigned long kprobe_inst, | |
190 | unsigned long addr) | |
191 | { | |
192 | int qp; | |
193 | ||
194 | qp = kprobe_inst & 0x3f; | |
195 | if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) { | |
196 | if (slot == 1 && qp) { | |
c2eeb321 JP |
197 | printk(KERN_WARNING "Kprobes on cmp unc " |
198 | "instruction on slot 1 at <0x%lx> " | |
df3e0d1c | 199 | "is not supported\n", addr); |
200 | return -EINVAL; | |
201 | ||
202 | } | |
203 | qp = 0; | |
204 | } | |
205 | else if (bundle_encoding[template][slot] == I) { | |
206 | if (major_opcode == 0) { | |
207 | /* | |
208 | * Check for Integer speculation instruction | |
209 | * - Bit 33-35 to be equal to 0x1 | |
210 | */ | |
211 | if (((kprobe_inst >> 33) & 0x7) == 1) { | |
212 | printk(KERN_WARNING | |
213 | "Kprobes on speculation inst at <0x%lx> not supported\n", | |
214 | addr); | |
215 | return -EINVAL; | |
216 | } | |
217 | /* | |
218 | * IP relative mov instruction | |
219 | * - Bit 27-35 to be equal to 0x30 | |
220 | */ | |
221 | if (((kprobe_inst >> 27) & 0x1FF) == 0x30) { | |
222 | printk(KERN_WARNING | |
223 | "Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n", | |
224 | addr); | |
225 | return -EINVAL; | |
226 | ||
227 | } | |
228 | } | |
229 | else if ((major_opcode == 5) && !(kprobe_inst & (0xFUl << 33)) && | |
230 | (kprobe_inst & (0x1UL << 12))) { | |
231 | /* test bit instructions, tbit,tnat,tf | |
232 | * bit 33-36 to be equal to 0 | |
233 | * bit 12 to be equal to 1 | |
234 | */ | |
235 | if (slot == 1 && qp) { | |
c2eeb321 JP |
236 | printk(KERN_WARNING "Kprobes on test bit " |
237 | "instruction on slot at <0x%lx> " | |
df3e0d1c | 238 | "is not supported\n", addr); |
239 | return -EINVAL; | |
240 | } | |
241 | qp = 0; | |
242 | } | |
243 | } | |
244 | else if (bundle_encoding[template][slot] == B) { | |
245 | if (major_opcode == 7) { | |
246 | /* IP-Relative Predict major code is 7 */ | |
247 | printk(KERN_WARNING "Kprobes on IP-Relative" | |
248 | "Predict is not supported\n"); | |
249 | return -EINVAL; | |
250 | } | |
251 | else if (major_opcode == 2) { | |
252 | /* Indirect Predict, major code is 2 | |
253 | * bit 27-32 to be equal to 10 or 11 | |
254 | */ | |
255 | int x6=(kprobe_inst >> 27) & 0x3F; | |
256 | if ((x6 == 0x10) || (x6 == 0x11)) { | |
c2eeb321 | 257 | printk(KERN_WARNING "Kprobes on " |
df3e0d1c | 258 | "Indirect Predict is not supported\n"); |
259 | return -EINVAL; | |
260 | } | |
261 | } | |
262 | } | |
263 | /* kernel does not use float instruction, here for safety kprobe | |
264 | * will judge whether it is fcmp/flass/float approximation instruction | |
265 | */ | |
266 | else if (unlikely(bundle_encoding[template][slot] == F)) { | |
267 | if ((major_opcode == 4 || major_opcode == 5) && | |
268 | (kprobe_inst & (0x1 << 12))) { | |
269 | /* fcmp/fclass unc instruction */ | |
270 | if (slot == 1 && qp) { | |
271 | printk(KERN_WARNING "Kprobes on fcmp/fclass " | |
272 | "instruction on slot at <0x%lx> " | |
273 | "is not supported\n", addr); | |
274 | return -EINVAL; | |
275 | ||
276 | } | |
277 | qp = 0; | |
278 | } | |
279 | if ((major_opcode == 0 || major_opcode == 1) && | |
280 | (kprobe_inst & (0x1UL << 33))) { | |
281 | /* float Approximation instruction */ | |
282 | if (slot == 1 && qp) { | |
283 | printk(KERN_WARNING "Kprobes on float Approx " | |
284 | "instr at <0x%lx> is not supported\n", | |
285 | addr); | |
286 | return -EINVAL; | |
287 | } | |
288 | qp = 0; | |
289 | } | |
290 | } | |
291 | return qp; | |
292 | } | |
293 | ||
a5403183 AK |
294 | /* |
295 | * In this function we override the bundle with | |
296 | * the break instruction at the given slot. | |
297 | */ | |
1f7ad57b PP |
298 | static void __kprobes prepare_break_inst(uint template, uint slot, |
299 | uint major_opcode, | |
300 | unsigned long kprobe_inst, | |
df3e0d1c | 301 | struct kprobe *p, |
302 | int qp) | |
a5403183 AK |
303 | { |
304 | unsigned long break_inst = BREAK_INST; | |
214ddde2 | 305 | bundle_t *bundle = &p->opcode.bundle; |
a5403183 AK |
306 | |
307 | /* | |
308 | * Copy the original kprobe_inst qualifying predicate(qp) | |
df3e0d1c | 309 | * to the break instruction |
a5403183 | 310 | */ |
df3e0d1c | 311 | break_inst |= qp; |
a5403183 AK |
312 | |
313 | switch (slot) { | |
314 | case 0: | |
315 | bundle->quad0.slot0 = break_inst; | |
316 | break; | |
317 | case 1: | |
318 | bundle->quad0.slot1_p0 = break_inst; | |
319 | bundle->quad1.slot1_p1 = break_inst >> (64-46); | |
320 | break; | |
321 | case 2: | |
322 | bundle->quad1.slot2 = break_inst; | |
323 | break; | |
8bc76772 | 324 | } |
cd2675bf | 325 | |
a5403183 AK |
326 | /* |
327 | * Update the instruction flag, so that we can | |
328 | * emulate the instruction properly after we | |
329 | * single step on original instruction | |
330 | */ | |
331 | update_kprobe_inst_flag(template, slot, major_opcode, kprobe_inst, p); | |
332 | } | |
333 | ||
3ca269d8 | 334 | static void __kprobes get_kprobe_inst(bundle_t *bundle, uint slot, |
a5403183 AK |
335 | unsigned long *kprobe_inst, uint *major_opcode) |
336 | { | |
337 | unsigned long kprobe_inst_p0, kprobe_inst_p1; | |
338 | unsigned int template; | |
339 | ||
340 | template = bundle->quad0.template; | |
fd7b231f | 341 | |
fd7b231f | 342 | switch (slot) { |
a5403183 | 343 | case 0: |
62c27be0 | 344 | *major_opcode = (bundle->quad0.slot0 >> SLOT0_OPCODE_SHIFT); |
345 | *kprobe_inst = bundle->quad0.slot0; | |
346 | break; | |
a5403183 | 347 | case 1: |
62c27be0 | 348 | *major_opcode = (bundle->quad1.slot1_p1 >> SLOT1_p1_OPCODE_SHIFT); |
349 | kprobe_inst_p0 = bundle->quad0.slot1_p0; | |
350 | kprobe_inst_p1 = bundle->quad1.slot1_p1; | |
351 | *kprobe_inst = kprobe_inst_p0 | (kprobe_inst_p1 << (64-46)); | |
fd7b231f | 352 | break; |
a5403183 | 353 | case 2: |
62c27be0 | 354 | *major_opcode = (bundle->quad1.slot2 >> SLOT2_OPCODE_SHIFT); |
355 | *kprobe_inst = bundle->quad1.slot2; | |
fd7b231f AK |
356 | break; |
357 | } | |
a5403183 | 358 | } |
fd7b231f | 359 | |
c7b645f9 | 360 | /* Returns non-zero if the addr is in the Interrupt Vector Table */ |
3ca269d8 | 361 | static int __kprobes in_ivt_functions(unsigned long addr) |
c7b645f9 KA |
362 | { |
363 | return (addr >= (unsigned long)__start_ivt_text | |
364 | && addr < (unsigned long)__end_ivt_text); | |
365 | } | |
366 | ||
1f7ad57b PP |
367 | static int __kprobes valid_kprobe_addr(int template, int slot, |
368 | unsigned long addr) | |
a5403183 AK |
369 | { |
370 | if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) { | |
c7b645f9 KA |
371 | printk(KERN_WARNING "Attempting to insert unaligned kprobe " |
372 | "at 0x%lx\n", addr); | |
a5403183 | 373 | return -EINVAL; |
8bc76772 | 374 | } |
a528e21c | 375 | |
62c27be0 | 376 | if (in_ivt_functions(addr)) { |
377 | printk(KERN_WARNING "Kprobes can't be inserted inside " | |
c7b645f9 | 378 | "IVT functions at 0x%lx\n", addr); |
62c27be0 | 379 | return -EINVAL; |
380 | } | |
c7b645f9 | 381 | |
a5403183 AK |
382 | return 0; |
383 | } | |
384 | ||
3ca269d8 | 385 | static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 386 | { |
cdc7dbdf AK |
387 | unsigned int i; |
388 | i = atomic_add_return(1, &kcb->prev_kprobe_index); | |
389 | kcb->prev_kprobe[i-1].kp = kprobe_running(); | |
390 | kcb->prev_kprobe[i-1].status = kcb->kprobe_status; | |
852caccc AK |
391 | } |
392 | ||
3ca269d8 | 393 | static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 394 | { |
cdc7dbdf | 395 | unsigned int i; |
97075c4b | 396 | i = atomic_read(&kcb->prev_kprobe_index); |
6065a244 | 397 | __this_cpu_write(current_kprobe, kcb->prev_kprobe[i-1].kp); |
97075c4b MH |
398 | kcb->kprobe_status = kcb->prev_kprobe[i-1].status; |
399 | atomic_sub(1, &kcb->prev_kprobe_index); | |
852caccc AK |
400 | } |
401 | ||
3ca269d8 | 402 | static void __kprobes set_current_kprobe(struct kprobe *p, |
8a5c4dc5 | 403 | struct kprobe_ctlblk *kcb) |
852caccc | 404 | { |
6065a244 | 405 | __this_cpu_write(current_kprobe, p); |
852caccc AK |
406 | } |
407 | ||
9508dbfe RL |
408 | static void kretprobe_trampoline(void) |
409 | { | |
410 | } | |
411 | ||
412 | /* | |
413 | * At this point the target function has been tricked into | |
414 | * returning into our trampoline. Lookup the associated instance | |
415 | * and then: | |
416 | * - call the handler function | |
417 | * - cleanup by marking the instance as unused | |
418 | * - long jump back to the original return address | |
419 | */ | |
1f7ad57b | 420 | int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) |
9508dbfe RL |
421 | { |
422 | struct kretprobe_instance *ri = NULL; | |
99219a3f | 423 | struct hlist_head *head, empty_rp; |
b67bfe0d | 424 | struct hlist_node *tmp; |
991a51d8 | 425 | unsigned long flags, orig_ret_address = 0; |
9508dbfe RL |
426 | unsigned long trampoline_address = |
427 | ((struct fnptr *)kretprobe_trampoline)->ip; | |
428 | ||
99219a3f | 429 | INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5 | 430 | kretprobe_hash_lock(current, &head, &flags); |
9508dbfe RL |
431 | |
432 | /* | |
433 | * It is possible to have multiple instances associated with a given | |
434 | * task either because an multiple functions in the call path | |
025dfdaf | 435 | * have a return probe installed on them, and/or more than one return |
9508dbfe RL |
436 | * return probe was registered for a target function. |
437 | * | |
438 | * We can handle this because: | |
439 | * - instances are always inserted at the head of the list | |
440 | * - when multiple return probes are registered for the same | |
441 | * function, the first instance's ret_addr will point to the | |
442 | * real return address, and all the rest will point to | |
443 | * kretprobe_trampoline | |
444 | */ | |
b67bfe0d | 445 | hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
3661999a SL |
446 | if (ri->task != current) |
447 | /* another task is sharing our hash bucket */ | |
448 | continue; | |
449 | ||
450 | orig_ret_address = (unsigned long)ri->ret_addr; | |
451 | if (orig_ret_address != trampoline_address) | |
452 | /* | |
453 | * This is the real return address. Any other | |
454 | * instances associated with this task are for | |
455 | * other calls deeper on the call stack | |
456 | */ | |
457 | break; | |
458 | } | |
459 | ||
460 | regs->cr_iip = orig_ret_address; | |
461 | ||
b67bfe0d | 462 | hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
9138d581 | 463 | if (ri->task != current) |
9508dbfe | 464 | /* another task is sharing our hash bucket */ |
9138d581 | 465 | continue; |
9508dbfe RL |
466 | |
467 | if (ri->rp && ri->rp->handler) | |
468 | ri->rp->handler(ri, regs); | |
469 | ||
470 | orig_ret_address = (unsigned long)ri->ret_addr; | |
99219a3f | 471 | recycle_rp_inst(ri, &empty_rp); |
9508dbfe RL |
472 | |
473 | if (orig_ret_address != trampoline_address) | |
474 | /* | |
475 | * This is the real return address. Any other | |
476 | * instances associated with this task are for | |
477 | * other calls deeper on the call stack | |
478 | */ | |
479 | break; | |
480 | } | |
0f95b7fc AM |
481 | kretprobe_assert(ri, orig_ret_address, trampoline_address); |
482 | ||
ef53d9c5 | 483 | kretprobe_hash_unlock(current, &flags); |
9508dbfe | 484 | |
b67bfe0d | 485 | hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3f | 486 | hlist_del(&ri->hlist); |
487 | kfree(ri); | |
488 | } | |
d217d545 AM |
489 | /* |
490 | * By returning a non-zero value, we are telling | |
491 | * kprobe_handler() that we don't want the post_handler | |
492 | * to run (and have re-enabled preemption) | |
493 | */ | |
9138d581 | 494 | return 1; |
9508dbfe RL |
495 | } |
496 | ||
4c4308cb | 497 | void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, |
1f7ad57b | 498 | struct pt_regs *regs) |
9508dbfe | 499 | { |
4c4308cb | 500 | ri->ret_addr = (kprobe_opcode_t *)regs->b0; |
9508dbfe | 501 | |
4c4308cb CH |
502 | /* Replace the return addr with trampoline addr */ |
503 | regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; | |
9508dbfe RL |
504 | } |
505 | ||
34e1ceb1 MH |
506 | /* Check the instruction in the slot is break */ |
507 | static int __kprobes __is_ia64_break_inst(bundle_t *bundle, uint slot) | |
508 | { | |
509 | unsigned int major_opcode; | |
510 | unsigned int template = bundle->quad0.template; | |
511 | unsigned long kprobe_inst; | |
512 | ||
513 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
514 | if (slot == 1 && bundle_encoding[template][1] == L) | |
515 | slot++; | |
516 | ||
517 | /* Get Kprobe probe instruction at given slot*/ | |
518 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
519 | ||
520 | /* For break instruction, | |
521 | * Bits 37:40 Major opcode to be zero | |
522 | * Bits 27:32 X6 to be zero | |
523 | * Bits 32:35 X3 to be zero | |
524 | */ | |
525 | if (major_opcode || ((kprobe_inst >> 27) & 0x1FF)) { | |
526 | /* Not a break instruction */ | |
527 | return 0; | |
528 | } | |
529 | ||
530 | /* Is a break instruction */ | |
531 | return 1; | |
532 | } | |
533 | ||
534 | /* | |
535 | * In this function, we check whether the target bundle modifies IP or | |
536 | * it triggers an exception. If so, it cannot be boostable. | |
537 | */ | |
538 | static int __kprobes can_boost(bundle_t *bundle, uint slot, | |
539 | unsigned long bundle_addr) | |
540 | { | |
541 | unsigned int template = bundle->quad0.template; | |
542 | ||
543 | do { | |
544 | if (search_exception_tables(bundle_addr + slot) || | |
545 | __is_ia64_break_inst(bundle, slot)) | |
546 | return 0; /* exception may occur in this bundle*/ | |
547 | } while ((++slot) < 3); | |
548 | template &= 0x1e; | |
549 | if (template >= 0x10 /* including B unit */ || | |
550 | template == 0x04 /* including X unit */ || | |
551 | template == 0x06) /* undefined */ | |
552 | return 0; | |
553 | ||
554 | return 1; | |
555 | } | |
556 | ||
557 | /* Prepare long jump bundle and disables other boosters if need */ | |
558 | static void __kprobes prepare_booster(struct kprobe *p) | |
559 | { | |
560 | unsigned long addr = (unsigned long)p->addr & ~0xFULL; | |
561 | unsigned int slot = (unsigned long)p->addr & 0xf; | |
562 | struct kprobe *other_kp; | |
563 | ||
564 | if (can_boost(&p->ainsn.insn[0].bundle, slot, addr)) { | |
565 | set_brl_inst(&p->ainsn.insn[1].bundle, (bundle_t *)addr + 1); | |
566 | p->ainsn.inst_flag |= INST_FLAG_BOOSTABLE; | |
567 | } | |
568 | ||
569 | /* disables boosters in previous slots */ | |
570 | for (; addr < (unsigned long)p->addr; addr++) { | |
571 | other_kp = get_kprobe((void *)addr); | |
572 | if (other_kp) | |
573 | other_kp->ainsn.inst_flag &= ~INST_FLAG_BOOSTABLE; | |
574 | } | |
575 | } | |
576 | ||
1f7ad57b | 577 | int __kprobes arch_prepare_kprobe(struct kprobe *p) |
a5403183 AK |
578 | { |
579 | unsigned long addr = (unsigned long) p->addr; | |
580 | unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL); | |
581 | unsigned long kprobe_inst=0; | |
582 | unsigned int slot = addr & 0xf, template, major_opcode = 0; | |
214ddde2 | 583 | bundle_t *bundle; |
df3e0d1c | 584 | int qp; |
a5403183 | 585 | |
214ddde2 | 586 | bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle; |
62c27be0 | 587 | template = bundle->quad0.template; |
a5403183 AK |
588 | |
589 | if(valid_kprobe_addr(template, slot, addr)) | |
590 | return -EINVAL; | |
591 | ||
592 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
62c27be0 | 593 | if (slot == 1 && bundle_encoding[template][1] == L) |
594 | slot++; | |
a5403183 AK |
595 | |
596 | /* Get kprobe_inst and major_opcode from the bundle */ | |
597 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
598 | ||
df3e0d1c | 599 | qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr); |
600 | if (qp < 0) | |
601 | return -EINVAL; | |
8bc76772 | 602 | |
214ddde2 | 603 | p->ainsn.insn = get_insn_slot(); |
604 | if (!p->ainsn.insn) | |
605 | return -ENOMEM; | |
606 | memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t)); | |
607 | memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t)); | |
8bc76772 | 608 | |
df3e0d1c | 609 | prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp); |
a9ad965e | 610 | |
34e1ceb1 MH |
611 | prepare_booster(p); |
612 | ||
214ddde2 | 613 | return 0; |
a9ad965e | 614 | } |
615 | ||
1f7ad57b | 616 | void __kprobes arch_arm_kprobe(struct kprobe *p) |
8bc76772 | 617 | { |
08ed38b6 TL |
618 | unsigned long arm_addr; |
619 | bundle_t *src, *dest; | |
620 | ||
621 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; | |
622 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
623 | src = &p->opcode.bundle; | |
8bc76772 | 624 | |
214ddde2 | 625 | flush_icache_range((unsigned long)p->ainsn.insn, |
34e1ceb1 MH |
626 | (unsigned long)p->ainsn.insn + |
627 | sizeof(kprobe_opcode_t) * MAX_INSN_SIZE); | |
628 | ||
08ed38b6 TL |
629 | switch (p->ainsn.slot) { |
630 | case 0: | |
631 | dest->quad0.slot0 = src->quad0.slot0; | |
632 | break; | |
633 | case 1: | |
634 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
635 | break; | |
636 | case 2: | |
637 | dest->quad1.slot2 = src->quad1.slot2; | |
638 | break; | |
639 | } | |
214ddde2 | 640 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
641 | } |
642 | ||
1f7ad57b | 643 | void __kprobes arch_disarm_kprobe(struct kprobe *p) |
fd7b231f | 644 | { |
08ed38b6 TL |
645 | unsigned long arm_addr; |
646 | bundle_t *src, *dest; | |
fd7b231f | 647 | |
08ed38b6 TL |
648 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; |
649 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
214ddde2 | 650 | /* p->ainsn.insn contains the original unaltered kprobe_opcode_t */ |
08ed38b6 TL |
651 | src = &p->ainsn.insn->bundle; |
652 | switch (p->ainsn.slot) { | |
653 | case 0: | |
654 | dest->quad0.slot0 = src->quad0.slot0; | |
655 | break; | |
656 | case 1: | |
657 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
658 | break; | |
659 | case 2: | |
660 | dest->quad1.slot2 = src->quad1.slot2; | |
661 | break; | |
662 | } | |
214ddde2 | 663 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
664 | } |
665 | ||
214ddde2 | 666 | void __kprobes arch_remove_kprobe(struct kprobe *p) |
667 | { | |
12941560 MH |
668 | if (p->ainsn.insn) { |
669 | free_insn_slot(p->ainsn.insn, | |
670 | p->ainsn.inst_flag & INST_FLAG_BOOSTABLE); | |
671 | p->ainsn.insn = NULL; | |
672 | } | |
214ddde2 | 673 | } |
fd7b231f AK |
674 | /* |
675 | * We are resuming execution after a single step fault, so the pt_regs | |
676 | * structure reflects the register state after we executed the instruction | |
34e1ceb1 | 677 | * located in the kprobe (p->ainsn.insn->bundle). We still need to adjust |
cd2675bf AK |
678 | * the ip to point back to the original stack address. To set the IP address |
679 | * to original stack address, handle the case where we need to fixup the | |
680 | * relative IP address and/or fixup branch register. | |
fd7b231f | 681 | */ |
1f7ad57b | 682 | static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 683 | { |
62c27be0 | 684 | unsigned long bundle_addr = (unsigned long) (&p->ainsn.insn->bundle); |
685 | unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL; | |
686 | unsigned long template; | |
687 | int slot = ((unsigned long)p->addr & 0xf); | |
fd7b231f | 688 | |
214ddde2 | 689 | template = p->ainsn.insn->bundle.quad0.template; |
cd2675bf | 690 | |
62c27be0 | 691 | if (slot == 1 && bundle_encoding[template][1] == L) |
692 | slot = 2; | |
cd2675bf | 693 | |
34e1ceb1 | 694 | if (p->ainsn.inst_flag & ~INST_FLAG_BOOSTABLE) { |
cd2675bf AK |
695 | |
696 | if (p->ainsn.inst_flag & INST_FLAG_FIX_RELATIVE_IP_ADDR) { | |
697 | /* Fix relative IP address */ | |
62c27be0 | 698 | regs->cr_iip = (regs->cr_iip - bundle_addr) + |
699 | resume_addr; | |
cd2675bf AK |
700 | } |
701 | ||
702 | if (p->ainsn.inst_flag & INST_FLAG_FIX_BRANCH_REG) { | |
703 | /* | |
704 | * Fix target branch register, software convention is | |
705 | * to use either b0 or b6 or b7, so just checking | |
706 | * only those registers | |
707 | */ | |
708 | switch (p->ainsn.target_br_reg) { | |
709 | case 0: | |
710 | if ((regs->b0 == bundle_addr) || | |
711 | (regs->b0 == bundle_addr + 0x10)) { | |
712 | regs->b0 = (regs->b0 - bundle_addr) + | |
713 | resume_addr; | |
714 | } | |
715 | break; | |
716 | case 6: | |
717 | if ((regs->b6 == bundle_addr) || | |
718 | (regs->b6 == bundle_addr + 0x10)) { | |
719 | regs->b6 = (regs->b6 - bundle_addr) + | |
720 | resume_addr; | |
721 | } | |
722 | break; | |
723 | case 7: | |
724 | if ((regs->b7 == bundle_addr) || | |
725 | (regs->b7 == bundle_addr + 0x10)) { | |
726 | regs->b7 = (regs->b7 - bundle_addr) + | |
727 | resume_addr; | |
728 | } | |
729 | break; | |
730 | } /* end switch */ | |
731 | } | |
732 | goto turn_ss_off; | |
733 | } | |
fd7b231f | 734 | |
cd2675bf | 735 | if (slot == 2) { |
62c27be0 | 736 | if (regs->cr_iip == bundle_addr + 0x10) { |
737 | regs->cr_iip = resume_addr + 0x10; | |
738 | } | |
739 | } else { | |
740 | if (regs->cr_iip == bundle_addr) { | |
741 | regs->cr_iip = resume_addr; | |
742 | } | |
a5403183 | 743 | } |
fd7b231f | 744 | |
cd2675bf | 745 | turn_ss_off: |
62c27be0 | 746 | /* Turn off Single Step bit */ |
747 | ia64_psr(regs)->ss = 0; | |
fd7b231f AK |
748 | } |
749 | ||
1f7ad57b | 750 | static void __kprobes prepare_ss(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 751 | { |
214ddde2 | 752 | unsigned long bundle_addr = (unsigned long) &p->ainsn.insn->bundle; |
fd7b231f AK |
753 | unsigned long slot = (unsigned long)p->addr & 0xf; |
754 | ||
deac66ae KA |
755 | /* single step inline if break instruction */ |
756 | if (p->ainsn.inst_flag == INST_FLAG_BREAK_INST) | |
757 | regs->cr_iip = (unsigned long)p->addr & ~0xFULL; | |
758 | else | |
759 | regs->cr_iip = bundle_addr & ~0xFULL; | |
fd7b231f AK |
760 | |
761 | if (slot > 2) | |
762 | slot = 0; | |
763 | ||
764 | ia64_psr(regs)->ri = slot; | |
765 | ||
766 | /* turn on single stepping */ | |
767 | ia64_psr(regs)->ss = 1; | |
768 | } | |
769 | ||
661e5a3d KA |
770 | static int __kprobes is_ia64_break_inst(struct pt_regs *regs) |
771 | { | |
772 | unsigned int slot = ia64_psr(regs)->ri; | |
661e5a3d KA |
773 | unsigned long *kprobe_addr = (unsigned long *)regs->cr_iip; |
774 | bundle_t bundle; | |
775 | ||
776 | memcpy(&bundle, kprobe_addr, sizeof(bundle_t)); | |
661e5a3d | 777 | |
34e1ceb1 | 778 | return __is_ia64_break_inst(&bundle, slot); |
661e5a3d KA |
779 | } |
780 | ||
1f7ad57b | 781 | static int __kprobes pre_kprobes_handler(struct die_args *args) |
fd7b231f AK |
782 | { |
783 | struct kprobe *p; | |
784 | int ret = 0; | |
89cb14c0 | 785 | struct pt_regs *regs = args->regs; |
fd7b231f | 786 | kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs); |
d217d545 AM |
787 | struct kprobe_ctlblk *kcb; |
788 | ||
789 | /* | |
790 | * We don't want to be preempted for the entire | |
791 | * duration of kprobe processing | |
792 | */ | |
793 | preempt_disable(); | |
794 | kcb = get_kprobe_ctlblk(); | |
fd7b231f | 795 | |
fd7b231f AK |
796 | /* Handle recursion cases */ |
797 | if (kprobe_running()) { | |
798 | p = get_kprobe(addr); | |
799 | if (p) { | |
8a5c4dc5 | 800 | if ((kcb->kprobe_status == KPROBE_HIT_SS) && |
deac66ae | 801 | (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)) { |
62c27be0 | 802 | ia64_psr(regs)->ss = 0; |
fd7b231f AK |
803 | goto no_kprobe; |
804 | } | |
852caccc AK |
805 | /* We have reentered the pre_kprobe_handler(), since |
806 | * another probe was hit while within the handler. | |
807 | * We here save the original kprobes variables and | |
808 | * just single step on the instruction of the new probe | |
809 | * without calling any user handlers. | |
810 | */ | |
8a5c4dc5 AM |
811 | save_previous_kprobe(kcb); |
812 | set_current_kprobe(p, kcb); | |
bf8d5c52 | 813 | kprobes_inc_nmissed_count(p); |
852caccc | 814 | prepare_ss(p, regs); |
8a5c4dc5 | 815 | kcb->kprobe_status = KPROBE_REENTER; |
852caccc | 816 | return 1; |
eb3a7292 KA |
817 | } else if (!is_ia64_break_inst(regs)) { |
818 | /* The breakpoint instruction was removed by | |
819 | * another cpu right after we hit, no further | |
820 | * handling of this interrupt is appropriate | |
821 | */ | |
822 | ret = 1; | |
823 | goto no_kprobe; | |
89cb14c0 KA |
824 | } else { |
825 | /* Not our break */ | |
826 | goto no_kprobe; | |
fd7b231f AK |
827 | } |
828 | } | |
829 | ||
fd7b231f AK |
830 | p = get_kprobe(addr); |
831 | if (!p) { | |
661e5a3d KA |
832 | if (!is_ia64_break_inst(regs)) { |
833 | /* | |
834 | * The breakpoint instruction was removed right | |
835 | * after we hit it. Another cpu has removed | |
836 | * either a probepoint or a debugger breakpoint | |
837 | * at this address. In either case, no further | |
838 | * handling of this interrupt is appropriate. | |
839 | */ | |
840 | ret = 1; | |
841 | ||
842 | } | |
843 | ||
844 | /* Not one of our break, let kernel handle it */ | |
fd7b231f AK |
845 | goto no_kprobe; |
846 | } | |
847 | ||
8a5c4dc5 AM |
848 | set_current_kprobe(p, kcb); |
849 | kcb->kprobe_status = KPROBE_HIT_ACTIVE; | |
fd7b231f | 850 | |
cce188bd MH |
851 | if (p->pre_handler && p->pre_handler(p, regs)) { |
852 | reset_current_kprobe(); | |
853 | preempt_enable_no_resched(); | |
fd7b231f | 854 | return 1; |
cce188bd | 855 | } |
fd7b231f | 856 | |
615d0ebb | 857 | #if !defined(CONFIG_PREEMPT) |
34e1ceb1 MH |
858 | if (p->ainsn.inst_flag == INST_FLAG_BOOSTABLE && !p->post_handler) { |
859 | /* Boost up -- we can execute copied instructions directly */ | |
860 | ia64_psr(regs)->ri = p->ainsn.slot; | |
861 | regs->cr_iip = (unsigned long)&p->ainsn.insn->bundle & ~0xFULL; | |
862 | /* turn single stepping off */ | |
863 | ia64_psr(regs)->ss = 0; | |
864 | ||
865 | reset_current_kprobe(); | |
866 | preempt_enable_no_resched(); | |
867 | return 1; | |
868 | } | |
869 | #endif | |
fd7b231f | 870 | prepare_ss(p, regs); |
8a5c4dc5 | 871 | kcb->kprobe_status = KPROBE_HIT_SS; |
fd7b231f AK |
872 | return 1; |
873 | ||
874 | no_kprobe: | |
d217d545 | 875 | preempt_enable_no_resched(); |
fd7b231f AK |
876 | return ret; |
877 | } | |
878 | ||
1f7ad57b | 879 | static int __kprobes post_kprobes_handler(struct pt_regs *regs) |
fd7b231f | 880 | { |
8a5c4dc5 AM |
881 | struct kprobe *cur = kprobe_running(); |
882 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
883 | ||
884 | if (!cur) | |
fd7b231f AK |
885 | return 0; |
886 | ||
8a5c4dc5 AM |
887 | if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) { |
888 | kcb->kprobe_status = KPROBE_HIT_SSDONE; | |
889 | cur->post_handler(cur, regs, 0); | |
852caccc | 890 | } |
fd7b231f | 891 | |
8a5c4dc5 | 892 | resume_execution(cur, regs); |
fd7b231f | 893 | |
852caccc | 894 | /*Restore back the original saved kprobes variables and continue. */ |
8a5c4dc5 AM |
895 | if (kcb->kprobe_status == KPROBE_REENTER) { |
896 | restore_previous_kprobe(kcb); | |
852caccc AK |
897 | goto out; |
898 | } | |
8a5c4dc5 | 899 | reset_current_kprobe(); |
852caccc AK |
900 | |
901 | out: | |
fd7b231f AK |
902 | preempt_enable_no_resched(); |
903 | return 1; | |
904 | } | |
905 | ||
45e18c22 | 906 | int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) |
fd7b231f | 907 | { |
8a5c4dc5 AM |
908 | struct kprobe *cur = kprobe_running(); |
909 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
910 | ||
fd7b231f | 911 | |
c04c1c81 PP |
912 | switch(kcb->kprobe_status) { |
913 | case KPROBE_HIT_SS: | |
914 | case KPROBE_REENTER: | |
915 | /* | |
916 | * We are here because the instruction being single | |
917 | * stepped caused a page fault. We reset the current | |
918 | * kprobe and the instruction pointer points back to | |
919 | * the probe address and allow the page fault handler | |
920 | * to continue as a normal page fault. | |
921 | */ | |
922 | regs->cr_iip = ((unsigned long)cur->addr) & ~0xFULL; | |
923 | ia64_psr(regs)->ri = ((unsigned long)cur->addr) & 0xf; | |
924 | if (kcb->kprobe_status == KPROBE_REENTER) | |
925 | restore_previous_kprobe(kcb); | |
926 | else | |
927 | reset_current_kprobe(); | |
fd7b231f | 928 | preempt_enable_no_resched(); |
c04c1c81 PP |
929 | break; |
930 | case KPROBE_HIT_ACTIVE: | |
931 | case KPROBE_HIT_SSDONE: | |
932 | /* | |
933 | * We increment the nmissed count for accounting, | |
23d6d3db | 934 | * we can also use npre/npostfault count for accounting |
c04c1c81 PP |
935 | * these specific fault cases. |
936 | */ | |
937 | kprobes_inc_nmissed_count(cur); | |
938 | ||
939 | /* | |
940 | * We come here because instructions in the pre/post | |
941 | * handler caused the page_fault, this could happen | |
942 | * if handler tries to access user space by | |
943 | * copy_from_user(), get_user() etc. Let the | |
944 | * user-specified handler try to fix it first. | |
945 | */ | |
946 | if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr)) | |
947 | return 1; | |
fd32cb3a KA |
948 | /* |
949 | * In case the user-specified fault handler returned | |
950 | * zero, try to fix up. | |
951 | */ | |
952 | if (ia64_done_with_exception(regs)) | |
953 | return 1; | |
c04c1c81 PP |
954 | |
955 | /* | |
956 | * Let ia64_do_page_fault() fix it. | |
957 | */ | |
958 | break; | |
959 | default: | |
960 | break; | |
fd7b231f AK |
961 | } |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
1f7ad57b PP |
966 | int __kprobes kprobe_exceptions_notify(struct notifier_block *self, |
967 | unsigned long val, void *data) | |
fd7b231f AK |
968 | { |
969 | struct die_args *args = (struct die_args *)data; | |
66ff2d06 AM |
970 | int ret = NOTIFY_DONE; |
971 | ||
2326c770 | 972 | if (args->regs && user_mode(args->regs)) |
973 | return ret; | |
974 | ||
fd7b231f AK |
975 | switch(val) { |
976 | case DIE_BREAK: | |
9138d581 | 977 | /* err is break number from ia64_bad_break() */ |
08ed38b6 | 978 | if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12) |
08ed38b6 | 979 | || args->err == 0) |
9138d581 KO |
980 | if (pre_kprobes_handler(args)) |
981 | ret = NOTIFY_STOP; | |
fd7b231f | 982 | break; |
9138d581 KO |
983 | case DIE_FAULT: |
984 | /* err is vector number from ia64_fault() */ | |
985 | if (args->err == 36) | |
986 | if (post_kprobes_handler(args->regs)) | |
987 | ret = NOTIFY_STOP; | |
fd7b231f | 988 | break; |
fd7b231f AK |
989 | default: |
990 | break; | |
991 | } | |
66ff2d06 | 992 | return ret; |
fd7b231f AK |
993 | } |
994 | ||
d3ef1f5a ZY |
995 | struct param_bsp_cfm { |
996 | unsigned long ip; | |
997 | unsigned long *bsp; | |
998 | unsigned long cfm; | |
999 | }; | |
1000 | ||
1001 | static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg) | |
1002 | { | |
1003 | unsigned long ip; | |
1004 | struct param_bsp_cfm *lp = arg; | |
1005 | ||
1006 | do { | |
1007 | unw_get_ip(info, &ip); | |
1008 | if (ip == 0) | |
1009 | break; | |
1010 | if (ip == lp->ip) { | |
1011 | unw_get_bsp(info, (unsigned long*)&lp->bsp); | |
1012 | unw_get_cfm(info, (unsigned long*)&lp->cfm); | |
1013 | return; | |
1014 | } | |
1015 | } while (unw_unwind(info) >= 0); | |
d61b49c1 | 1016 | lp->bsp = NULL; |
d3ef1f5a ZY |
1017 | lp->cfm = 0; |
1018 | return; | |
1019 | } | |
1020 | ||
3d7e3382 ME |
1021 | unsigned long arch_deref_entry_point(void *entry) |
1022 | { | |
1023 | return ((struct fnptr *)entry)->ip; | |
1024 | } | |
1025 | ||
9508dbfe RL |
1026 | static struct kprobe trampoline_p = { |
1027 | .pre_handler = trampoline_probe_handler | |
1028 | }; | |
1029 | ||
6772926b | 1030 | int __init arch_init_kprobes(void) |
9508dbfe RL |
1031 | { |
1032 | trampoline_p.addr = | |
1033 | (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; | |
1034 | return register_kprobe(&trampoline_p); | |
1035 | } | |
bf8f6e5b AM |
1036 | |
1037 | int __kprobes arch_trampoline_kprobe(struct kprobe *p) | |
1038 | { | |
1039 | if (p->addr == | |
1040 | (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip) | |
1041 | return 1; | |
1042 | ||
1043 | return 0; | |
1044 | } |