Commit | Line | Data |
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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 | 42 | |
f438d914 MH |
43 | struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}}; |
44 | ||
fd7b231f AK |
45 | enum instruction_type {A, I, M, F, B, L, X, u}; |
46 | static enum instruction_type bundle_encoding[32][3] = { | |
47 | { M, I, I }, /* 00 */ | |
48 | { M, I, I }, /* 01 */ | |
49 | { M, I, I }, /* 02 */ | |
50 | { M, I, I }, /* 03 */ | |
51 | { M, L, X }, /* 04 */ | |
52 | { M, L, X }, /* 05 */ | |
53 | { u, u, u }, /* 06 */ | |
54 | { u, u, u }, /* 07 */ | |
55 | { M, M, I }, /* 08 */ | |
56 | { M, M, I }, /* 09 */ | |
57 | { M, M, I }, /* 0A */ | |
58 | { M, M, I }, /* 0B */ | |
59 | { M, F, I }, /* 0C */ | |
60 | { M, F, I }, /* 0D */ | |
61 | { M, M, F }, /* 0E */ | |
62 | { M, M, F }, /* 0F */ | |
63 | { M, I, B }, /* 10 */ | |
64 | { M, I, B }, /* 11 */ | |
65 | { M, B, B }, /* 12 */ | |
66 | { M, B, B }, /* 13 */ | |
67 | { u, u, u }, /* 14 */ | |
68 | { u, u, u }, /* 15 */ | |
69 | { B, B, B }, /* 16 */ | |
70 | { B, B, B }, /* 17 */ | |
71 | { M, M, B }, /* 18 */ | |
72 | { M, M, B }, /* 19 */ | |
73 | { u, u, u }, /* 1A */ | |
74 | { u, u, u }, /* 1B */ | |
75 | { M, F, B }, /* 1C */ | |
76 | { M, F, B }, /* 1D */ | |
77 | { u, u, u }, /* 1E */ | |
78 | { u, u, u }, /* 1F */ | |
79 | }; | |
80 | ||
34e1ceb1 MH |
81 | /* Insert a long branch code */ |
82 | static void __kprobes set_brl_inst(void *from, void *to) | |
83 | { | |
84 | s64 rel = ((s64) to - (s64) from) >> 4; | |
85 | bundle_t *brl; | |
86 | brl = (bundle_t *) ((u64) from & ~0xf); | |
87 | brl->quad0.template = 0x05; /* [MLX](stop) */ | |
88 | brl->quad0.slot0 = NOP_M_INST; /* nop.m 0x0 */ | |
89 | brl->quad0.slot1_p0 = ((rel >> 20) & 0x7fffffffff) << 2; | |
90 | brl->quad1.slot1_p1 = (((rel >> 20) & 0x7fffffffff) << 2) >> (64 - 46); | |
91 | /* brl.cond.sptk.many.clr rel<<4 (qp=0) */ | |
92 | brl->quad1.slot2 = BRL_INST(rel >> 59, rel & 0xfffff); | |
93 | } | |
94 | ||
a5403183 AK |
95 | /* |
96 | * In this function we check to see if the instruction | |
97 | * is IP relative instruction and update the kprobe | |
98 | * inst flag accordingly | |
99 | */ | |
1f7ad57b PP |
100 | static void __kprobes update_kprobe_inst_flag(uint template, uint slot, |
101 | uint major_opcode, | |
102 | unsigned long kprobe_inst, | |
103 | struct kprobe *p) | |
fd7b231f | 104 | { |
8bc76772 RL |
105 | p->ainsn.inst_flag = 0; |
106 | p->ainsn.target_br_reg = 0; | |
08ed38b6 | 107 | p->ainsn.slot = slot; |
fd7b231f | 108 | |
deac66ae | 109 | /* Check for Break instruction |
62c27be0 | 110 | * Bits 37:40 Major opcode to be zero |
deac66ae KA |
111 | * Bits 27:32 X6 to be zero |
112 | * Bits 32:35 X3 to be zero | |
113 | */ | |
114 | if ((!major_opcode) && (!((kprobe_inst >> 27) & 0x1FF)) ) { | |
115 | /* is a break instruction */ | |
116 | p->ainsn.inst_flag |= INST_FLAG_BREAK_INST; | |
117 | return; | |
118 | } | |
119 | ||
a5403183 AK |
120 | if (bundle_encoding[template][slot] == B) { |
121 | switch (major_opcode) { | |
122 | case INDIRECT_CALL_OPCODE: | |
123 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
62c27be0 | 124 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); |
125 | break; | |
a5403183 AK |
126 | case IP_RELATIVE_PREDICT_OPCODE: |
127 | case IP_RELATIVE_BRANCH_OPCODE: | |
128 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; | |
62c27be0 | 129 | break; |
a5403183 | 130 | case IP_RELATIVE_CALL_OPCODE: |
62c27be0 | 131 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; |
132 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
133 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
134 | break; | |
a5403183 | 135 | } |
62c27be0 | 136 | } else if (bundle_encoding[template][slot] == X) { |
a5403183 AK |
137 | switch (major_opcode) { |
138 | case LONG_CALL_OPCODE: | |
139 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
140 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
141 | break; | |
142 | } | |
143 | } | |
144 | return; | |
145 | } | |
fd7b231f | 146 | |
1674eafc AK |
147 | /* |
148 | * In this function we check to see if the instruction | |
149 | * (qp) cmpx.crel.ctype p1,p2=r2,r3 | |
150 | * on which we are inserting kprobe is cmp instruction | |
151 | * with ctype as unc. | |
152 | */ | |
1f7ad57b PP |
153 | static uint __kprobes is_cmp_ctype_unc_inst(uint template, uint slot, |
154 | uint major_opcode, | |
155 | unsigned long kprobe_inst) | |
1674eafc AK |
156 | { |
157 | cmp_inst_t cmp_inst; | |
158 | uint ctype_unc = 0; | |
159 | ||
160 | if (!((bundle_encoding[template][slot] == I) || | |
161 | (bundle_encoding[template][slot] == M))) | |
162 | goto out; | |
163 | ||
164 | if (!((major_opcode == 0xC) || (major_opcode == 0xD) || | |
165 | (major_opcode == 0xE))) | |
166 | goto out; | |
167 | ||
168 | cmp_inst.l = kprobe_inst; | |
169 | if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) { | |
72fdbdce | 170 | /* Integer compare - Register Register (A6 type)*/ |
1674eafc AK |
171 | if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0) |
172 | &&(cmp_inst.f.c == 1)) | |
173 | ctype_unc = 1; | |
174 | } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) { | |
72fdbdce | 175 | /* Integer compare - Immediate Register (A8 type)*/ |
1674eafc AK |
176 | if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1)) |
177 | ctype_unc = 1; | |
178 | } | |
179 | out: | |
180 | return ctype_unc; | |
181 | } | |
182 | ||
df3e0d1c | 183 | /* |
184 | * In this function we check to see if the instruction | |
185 | * on which we are inserting kprobe is supported. | |
186 | * Returns qp value if supported | |
187 | * Returns -EINVAL if unsupported | |
188 | */ | |
189 | static int __kprobes unsupported_inst(uint template, uint slot, | |
190 | uint major_opcode, | |
191 | unsigned long kprobe_inst, | |
192 | unsigned long addr) | |
193 | { | |
194 | int qp; | |
195 | ||
196 | qp = kprobe_inst & 0x3f; | |
197 | if (is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) { | |
198 | if (slot == 1 && qp) { | |
c2eeb321 JP |
199 | printk(KERN_WARNING "Kprobes on cmp unc " |
200 | "instruction on slot 1 at <0x%lx> " | |
df3e0d1c | 201 | "is not supported\n", addr); |
202 | return -EINVAL; | |
203 | ||
204 | } | |
205 | qp = 0; | |
206 | } | |
207 | else if (bundle_encoding[template][slot] == I) { | |
208 | if (major_opcode == 0) { | |
209 | /* | |
210 | * Check for Integer speculation instruction | |
211 | * - Bit 33-35 to be equal to 0x1 | |
212 | */ | |
213 | if (((kprobe_inst >> 33) & 0x7) == 1) { | |
214 | printk(KERN_WARNING | |
215 | "Kprobes on speculation inst at <0x%lx> not supported\n", | |
216 | addr); | |
217 | return -EINVAL; | |
218 | } | |
219 | /* | |
220 | * IP relative mov instruction | |
221 | * - Bit 27-35 to be equal to 0x30 | |
222 | */ | |
223 | if (((kprobe_inst >> 27) & 0x1FF) == 0x30) { | |
224 | printk(KERN_WARNING | |
225 | "Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n", | |
226 | addr); | |
227 | return -EINVAL; | |
228 | ||
229 | } | |
230 | } | |
231 | else if ((major_opcode == 5) && !(kprobe_inst & (0xFUl << 33)) && | |
232 | (kprobe_inst & (0x1UL << 12))) { | |
233 | /* test bit instructions, tbit,tnat,tf | |
234 | * bit 33-36 to be equal to 0 | |
235 | * bit 12 to be equal to 1 | |
236 | */ | |
237 | if (slot == 1 && qp) { | |
c2eeb321 JP |
238 | printk(KERN_WARNING "Kprobes on test bit " |
239 | "instruction on slot at <0x%lx> " | |
df3e0d1c | 240 | "is not supported\n", addr); |
241 | return -EINVAL; | |
242 | } | |
243 | qp = 0; | |
244 | } | |
245 | } | |
246 | else if (bundle_encoding[template][slot] == B) { | |
247 | if (major_opcode == 7) { | |
248 | /* IP-Relative Predict major code is 7 */ | |
249 | printk(KERN_WARNING "Kprobes on IP-Relative" | |
250 | "Predict is not supported\n"); | |
251 | return -EINVAL; | |
252 | } | |
253 | else if (major_opcode == 2) { | |
254 | /* Indirect Predict, major code is 2 | |
255 | * bit 27-32 to be equal to 10 or 11 | |
256 | */ | |
257 | int x6=(kprobe_inst >> 27) & 0x3F; | |
258 | if ((x6 == 0x10) || (x6 == 0x11)) { | |
c2eeb321 | 259 | printk(KERN_WARNING "Kprobes on " |
df3e0d1c | 260 | "Indirect Predict is not supported\n"); |
261 | return -EINVAL; | |
262 | } | |
263 | } | |
264 | } | |
265 | /* kernel does not use float instruction, here for safety kprobe | |
266 | * will judge whether it is fcmp/flass/float approximation instruction | |
267 | */ | |
268 | else if (unlikely(bundle_encoding[template][slot] == F)) { | |
269 | if ((major_opcode == 4 || major_opcode == 5) && | |
270 | (kprobe_inst & (0x1 << 12))) { | |
271 | /* fcmp/fclass unc instruction */ | |
272 | if (slot == 1 && qp) { | |
273 | printk(KERN_WARNING "Kprobes on fcmp/fclass " | |
274 | "instruction on slot at <0x%lx> " | |
275 | "is not supported\n", addr); | |
276 | return -EINVAL; | |
277 | ||
278 | } | |
279 | qp = 0; | |
280 | } | |
281 | if ((major_opcode == 0 || major_opcode == 1) && | |
282 | (kprobe_inst & (0x1UL << 33))) { | |
283 | /* float Approximation instruction */ | |
284 | if (slot == 1 && qp) { | |
285 | printk(KERN_WARNING "Kprobes on float Approx " | |
286 | "instr at <0x%lx> is not supported\n", | |
287 | addr); | |
288 | return -EINVAL; | |
289 | } | |
290 | qp = 0; | |
291 | } | |
292 | } | |
293 | return qp; | |
294 | } | |
295 | ||
a5403183 AK |
296 | /* |
297 | * In this function we override the bundle with | |
298 | * the break instruction at the given slot. | |
299 | */ | |
1f7ad57b PP |
300 | static void __kprobes prepare_break_inst(uint template, uint slot, |
301 | uint major_opcode, | |
302 | unsigned long kprobe_inst, | |
df3e0d1c | 303 | struct kprobe *p, |
304 | int qp) | |
a5403183 AK |
305 | { |
306 | unsigned long break_inst = BREAK_INST; | |
214ddde2 | 307 | bundle_t *bundle = &p->opcode.bundle; |
a5403183 AK |
308 | |
309 | /* | |
310 | * Copy the original kprobe_inst qualifying predicate(qp) | |
df3e0d1c | 311 | * to the break instruction |
a5403183 | 312 | */ |
df3e0d1c | 313 | break_inst |= qp; |
a5403183 AK |
314 | |
315 | switch (slot) { | |
316 | case 0: | |
317 | bundle->quad0.slot0 = break_inst; | |
318 | break; | |
319 | case 1: | |
320 | bundle->quad0.slot1_p0 = break_inst; | |
321 | bundle->quad1.slot1_p1 = break_inst >> (64-46); | |
322 | break; | |
323 | case 2: | |
324 | bundle->quad1.slot2 = break_inst; | |
325 | break; | |
8bc76772 | 326 | } |
cd2675bf | 327 | |
a5403183 AK |
328 | /* |
329 | * Update the instruction flag, so that we can | |
330 | * emulate the instruction properly after we | |
331 | * single step on original instruction | |
332 | */ | |
333 | update_kprobe_inst_flag(template, slot, major_opcode, kprobe_inst, p); | |
334 | } | |
335 | ||
3ca269d8 | 336 | static void __kprobes get_kprobe_inst(bundle_t *bundle, uint slot, |
a5403183 AK |
337 | unsigned long *kprobe_inst, uint *major_opcode) |
338 | { | |
339 | unsigned long kprobe_inst_p0, kprobe_inst_p1; | |
340 | unsigned int template; | |
341 | ||
342 | template = bundle->quad0.template; | |
fd7b231f | 343 | |
fd7b231f | 344 | switch (slot) { |
a5403183 | 345 | case 0: |
62c27be0 | 346 | *major_opcode = (bundle->quad0.slot0 >> SLOT0_OPCODE_SHIFT); |
347 | *kprobe_inst = bundle->quad0.slot0; | |
348 | break; | |
a5403183 | 349 | case 1: |
62c27be0 | 350 | *major_opcode = (bundle->quad1.slot1_p1 >> SLOT1_p1_OPCODE_SHIFT); |
351 | kprobe_inst_p0 = bundle->quad0.slot1_p0; | |
352 | kprobe_inst_p1 = bundle->quad1.slot1_p1; | |
353 | *kprobe_inst = kprobe_inst_p0 | (kprobe_inst_p1 << (64-46)); | |
fd7b231f | 354 | break; |
a5403183 | 355 | case 2: |
62c27be0 | 356 | *major_opcode = (bundle->quad1.slot2 >> SLOT2_OPCODE_SHIFT); |
357 | *kprobe_inst = bundle->quad1.slot2; | |
fd7b231f AK |
358 | break; |
359 | } | |
a5403183 | 360 | } |
fd7b231f | 361 | |
c7b645f9 | 362 | /* Returns non-zero if the addr is in the Interrupt Vector Table */ |
3ca269d8 | 363 | static int __kprobes in_ivt_functions(unsigned long addr) |
c7b645f9 KA |
364 | { |
365 | return (addr >= (unsigned long)__start_ivt_text | |
366 | && addr < (unsigned long)__end_ivt_text); | |
367 | } | |
368 | ||
1f7ad57b PP |
369 | static int __kprobes valid_kprobe_addr(int template, int slot, |
370 | unsigned long addr) | |
a5403183 AK |
371 | { |
372 | if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) { | |
c7b645f9 KA |
373 | printk(KERN_WARNING "Attempting to insert unaligned kprobe " |
374 | "at 0x%lx\n", addr); | |
a5403183 | 375 | return -EINVAL; |
8bc76772 | 376 | } |
a528e21c | 377 | |
62c27be0 | 378 | if (in_ivt_functions(addr)) { |
379 | printk(KERN_WARNING "Kprobes can't be inserted inside " | |
c7b645f9 | 380 | "IVT functions at 0x%lx\n", addr); |
62c27be0 | 381 | return -EINVAL; |
382 | } | |
c7b645f9 | 383 | |
a5403183 AK |
384 | return 0; |
385 | } | |
386 | ||
3ca269d8 | 387 | static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 388 | { |
cdc7dbdf AK |
389 | unsigned int i; |
390 | i = atomic_add_return(1, &kcb->prev_kprobe_index); | |
391 | kcb->prev_kprobe[i-1].kp = kprobe_running(); | |
392 | kcb->prev_kprobe[i-1].status = kcb->kprobe_status; | |
852caccc AK |
393 | } |
394 | ||
3ca269d8 | 395 | static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb) |
852caccc | 396 | { |
cdc7dbdf | 397 | unsigned int i; |
97075c4b | 398 | i = atomic_read(&kcb->prev_kprobe_index); |
6065a244 | 399 | __this_cpu_write(current_kprobe, kcb->prev_kprobe[i-1].kp); |
97075c4b MH |
400 | kcb->kprobe_status = kcb->prev_kprobe[i-1].status; |
401 | atomic_sub(1, &kcb->prev_kprobe_index); | |
852caccc AK |
402 | } |
403 | ||
3ca269d8 | 404 | static void __kprobes set_current_kprobe(struct kprobe *p, |
8a5c4dc5 | 405 | struct kprobe_ctlblk *kcb) |
852caccc | 406 | { |
6065a244 | 407 | __this_cpu_write(current_kprobe, p); |
852caccc AK |
408 | } |
409 | ||
9508dbfe RL |
410 | static void kretprobe_trampoline(void) |
411 | { | |
412 | } | |
413 | ||
414 | /* | |
415 | * At this point the target function has been tricked into | |
416 | * returning into our trampoline. Lookup the associated instance | |
417 | * and then: | |
418 | * - call the handler function | |
419 | * - cleanup by marking the instance as unused | |
420 | * - long jump back to the original return address | |
421 | */ | |
1f7ad57b | 422 | int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) |
9508dbfe RL |
423 | { |
424 | struct kretprobe_instance *ri = NULL; | |
99219a3f | 425 | struct hlist_head *head, empty_rp; |
b67bfe0d | 426 | struct hlist_node *tmp; |
991a51d8 | 427 | unsigned long flags, orig_ret_address = 0; |
9508dbfe RL |
428 | unsigned long trampoline_address = |
429 | ((struct fnptr *)kretprobe_trampoline)->ip; | |
430 | ||
99219a3f | 431 | INIT_HLIST_HEAD(&empty_rp); |
ef53d9c5 | 432 | kretprobe_hash_lock(current, &head, &flags); |
9508dbfe RL |
433 | |
434 | /* | |
435 | * It is possible to have multiple instances associated with a given | |
436 | * task either because an multiple functions in the call path | |
025dfdaf | 437 | * have a return probe installed on them, and/or more than one return |
9508dbfe RL |
438 | * return probe was registered for a target function. |
439 | * | |
440 | * We can handle this because: | |
441 | * - instances are always inserted at the head of the list | |
442 | * - when multiple return probes are registered for the same | |
443 | * function, the first instance's ret_addr will point to the | |
444 | * real return address, and all the rest will point to | |
445 | * kretprobe_trampoline | |
446 | */ | |
b67bfe0d | 447 | hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
3661999a SL |
448 | if (ri->task != current) |
449 | /* another task is sharing our hash bucket */ | |
450 | continue; | |
451 | ||
452 | orig_ret_address = (unsigned long)ri->ret_addr; | |
453 | if (orig_ret_address != trampoline_address) | |
454 | /* | |
455 | * This is the real return address. Any other | |
456 | * instances associated with this task are for | |
457 | * other calls deeper on the call stack | |
458 | */ | |
459 | break; | |
460 | } | |
461 | ||
462 | regs->cr_iip = orig_ret_address; | |
463 | ||
b67bfe0d | 464 | hlist_for_each_entry_safe(ri, tmp, head, hlist) { |
9138d581 | 465 | if (ri->task != current) |
9508dbfe | 466 | /* another task is sharing our hash bucket */ |
9138d581 | 467 | continue; |
9508dbfe RL |
468 | |
469 | if (ri->rp && ri->rp->handler) | |
470 | ri->rp->handler(ri, regs); | |
471 | ||
472 | orig_ret_address = (unsigned long)ri->ret_addr; | |
99219a3f | 473 | recycle_rp_inst(ri, &empty_rp); |
9508dbfe RL |
474 | |
475 | if (orig_ret_address != trampoline_address) | |
476 | /* | |
477 | * This is the real return address. Any other | |
478 | * instances associated with this task are for | |
479 | * other calls deeper on the call stack | |
480 | */ | |
481 | break; | |
482 | } | |
483 | ||
0f95b7fc AM |
484 | kretprobe_assert(ri, orig_ret_address, trampoline_address); |
485 | ||
8a5c4dc5 | 486 | reset_current_kprobe(); |
ef53d9c5 | 487 | kretprobe_hash_unlock(current, &flags); |
9508dbfe RL |
488 | preempt_enable_no_resched(); |
489 | ||
b67bfe0d | 490 | hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) { |
99219a3f | 491 | hlist_del(&ri->hlist); |
492 | kfree(ri); | |
493 | } | |
d217d545 AM |
494 | /* |
495 | * By returning a non-zero value, we are telling | |
496 | * kprobe_handler() that we don't want the post_handler | |
497 | * to run (and have re-enabled preemption) | |
498 | */ | |
9138d581 | 499 | return 1; |
9508dbfe RL |
500 | } |
501 | ||
4c4308cb | 502 | void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri, |
1f7ad57b | 503 | struct pt_regs *regs) |
9508dbfe | 504 | { |
4c4308cb | 505 | ri->ret_addr = (kprobe_opcode_t *)regs->b0; |
9508dbfe | 506 | |
4c4308cb CH |
507 | /* Replace the return addr with trampoline addr */ |
508 | regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip; | |
9508dbfe RL |
509 | } |
510 | ||
34e1ceb1 MH |
511 | /* Check the instruction in the slot is break */ |
512 | static int __kprobes __is_ia64_break_inst(bundle_t *bundle, uint slot) | |
513 | { | |
514 | unsigned int major_opcode; | |
515 | unsigned int template = bundle->quad0.template; | |
516 | unsigned long kprobe_inst; | |
517 | ||
518 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
519 | if (slot == 1 && bundle_encoding[template][1] == L) | |
520 | slot++; | |
521 | ||
522 | /* Get Kprobe probe instruction at given slot*/ | |
523 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
524 | ||
525 | /* For break instruction, | |
526 | * Bits 37:40 Major opcode to be zero | |
527 | * Bits 27:32 X6 to be zero | |
528 | * Bits 32:35 X3 to be zero | |
529 | */ | |
530 | if (major_opcode || ((kprobe_inst >> 27) & 0x1FF)) { | |
531 | /* Not a break instruction */ | |
532 | return 0; | |
533 | } | |
534 | ||
535 | /* Is a break instruction */ | |
536 | return 1; | |
537 | } | |
538 | ||
539 | /* | |
540 | * In this function, we check whether the target bundle modifies IP or | |
541 | * it triggers an exception. If so, it cannot be boostable. | |
542 | */ | |
543 | static int __kprobes can_boost(bundle_t *bundle, uint slot, | |
544 | unsigned long bundle_addr) | |
545 | { | |
546 | unsigned int template = bundle->quad0.template; | |
547 | ||
548 | do { | |
549 | if (search_exception_tables(bundle_addr + slot) || | |
550 | __is_ia64_break_inst(bundle, slot)) | |
551 | return 0; /* exception may occur in this bundle*/ | |
552 | } while ((++slot) < 3); | |
553 | template &= 0x1e; | |
554 | if (template >= 0x10 /* including B unit */ || | |
555 | template == 0x04 /* including X unit */ || | |
556 | template == 0x06) /* undefined */ | |
557 | return 0; | |
558 | ||
559 | return 1; | |
560 | } | |
561 | ||
562 | /* Prepare long jump bundle and disables other boosters if need */ | |
563 | static void __kprobes prepare_booster(struct kprobe *p) | |
564 | { | |
565 | unsigned long addr = (unsigned long)p->addr & ~0xFULL; | |
566 | unsigned int slot = (unsigned long)p->addr & 0xf; | |
567 | struct kprobe *other_kp; | |
568 | ||
569 | if (can_boost(&p->ainsn.insn[0].bundle, slot, addr)) { | |
570 | set_brl_inst(&p->ainsn.insn[1].bundle, (bundle_t *)addr + 1); | |
571 | p->ainsn.inst_flag |= INST_FLAG_BOOSTABLE; | |
572 | } | |
573 | ||
574 | /* disables boosters in previous slots */ | |
575 | for (; addr < (unsigned long)p->addr; addr++) { | |
576 | other_kp = get_kprobe((void *)addr); | |
577 | if (other_kp) | |
578 | other_kp->ainsn.inst_flag &= ~INST_FLAG_BOOSTABLE; | |
579 | } | |
580 | } | |
581 | ||
1f7ad57b | 582 | int __kprobes arch_prepare_kprobe(struct kprobe *p) |
a5403183 AK |
583 | { |
584 | unsigned long addr = (unsigned long) p->addr; | |
585 | unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL); | |
586 | unsigned long kprobe_inst=0; | |
587 | unsigned int slot = addr & 0xf, template, major_opcode = 0; | |
214ddde2 | 588 | bundle_t *bundle; |
df3e0d1c | 589 | int qp; |
a5403183 | 590 | |
214ddde2 | 591 | bundle = &((kprobe_opcode_t *)kprobe_addr)->bundle; |
62c27be0 | 592 | template = bundle->quad0.template; |
a5403183 AK |
593 | |
594 | if(valid_kprobe_addr(template, slot, addr)) | |
595 | return -EINVAL; | |
596 | ||
597 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
62c27be0 | 598 | if (slot == 1 && bundle_encoding[template][1] == L) |
599 | slot++; | |
a5403183 AK |
600 | |
601 | /* Get kprobe_inst and major_opcode from the bundle */ | |
602 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
603 | ||
df3e0d1c | 604 | qp = unsupported_inst(template, slot, major_opcode, kprobe_inst, addr); |
605 | if (qp < 0) | |
606 | return -EINVAL; | |
8bc76772 | 607 | |
214ddde2 | 608 | p->ainsn.insn = get_insn_slot(); |
609 | if (!p->ainsn.insn) | |
610 | return -ENOMEM; | |
611 | memcpy(&p->opcode, kprobe_addr, sizeof(kprobe_opcode_t)); | |
612 | memcpy(p->ainsn.insn, kprobe_addr, sizeof(kprobe_opcode_t)); | |
8bc76772 | 613 | |
df3e0d1c | 614 | prepare_break_inst(template, slot, major_opcode, kprobe_inst, p, qp); |
a9ad965e | 615 | |
34e1ceb1 MH |
616 | prepare_booster(p); |
617 | ||
214ddde2 | 618 | return 0; |
a9ad965e | 619 | } |
620 | ||
1f7ad57b | 621 | void __kprobes arch_arm_kprobe(struct kprobe *p) |
8bc76772 | 622 | { |
08ed38b6 TL |
623 | unsigned long arm_addr; |
624 | bundle_t *src, *dest; | |
625 | ||
626 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; | |
627 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
628 | src = &p->opcode.bundle; | |
8bc76772 | 629 | |
214ddde2 | 630 | flush_icache_range((unsigned long)p->ainsn.insn, |
34e1ceb1 MH |
631 | (unsigned long)p->ainsn.insn + |
632 | sizeof(kprobe_opcode_t) * MAX_INSN_SIZE); | |
633 | ||
08ed38b6 TL |
634 | switch (p->ainsn.slot) { |
635 | case 0: | |
636 | dest->quad0.slot0 = src->quad0.slot0; | |
637 | break; | |
638 | case 1: | |
639 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
640 | break; | |
641 | case 2: | |
642 | dest->quad1.slot2 = src->quad1.slot2; | |
643 | break; | |
644 | } | |
214ddde2 | 645 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
646 | } |
647 | ||
1f7ad57b | 648 | void __kprobes arch_disarm_kprobe(struct kprobe *p) |
fd7b231f | 649 | { |
08ed38b6 TL |
650 | unsigned long arm_addr; |
651 | bundle_t *src, *dest; | |
fd7b231f | 652 | |
08ed38b6 TL |
653 | arm_addr = ((unsigned long)p->addr) & ~0xFUL; |
654 | dest = &((kprobe_opcode_t *)arm_addr)->bundle; | |
214ddde2 | 655 | /* p->ainsn.insn contains the original unaltered kprobe_opcode_t */ |
08ed38b6 TL |
656 | src = &p->ainsn.insn->bundle; |
657 | switch (p->ainsn.slot) { | |
658 | case 0: | |
659 | dest->quad0.slot0 = src->quad0.slot0; | |
660 | break; | |
661 | case 1: | |
662 | dest->quad1.slot1_p1 = src->quad1.slot1_p1; | |
663 | break; | |
664 | case 2: | |
665 | dest->quad1.slot2 = src->quad1.slot2; | |
666 | break; | |
667 | } | |
214ddde2 | 668 | flush_icache_range(arm_addr, arm_addr + sizeof(kprobe_opcode_t)); |
fd7b231f AK |
669 | } |
670 | ||
214ddde2 | 671 | void __kprobes arch_remove_kprobe(struct kprobe *p) |
672 | { | |
12941560 MH |
673 | if (p->ainsn.insn) { |
674 | free_insn_slot(p->ainsn.insn, | |
675 | p->ainsn.inst_flag & INST_FLAG_BOOSTABLE); | |
676 | p->ainsn.insn = NULL; | |
677 | } | |
214ddde2 | 678 | } |
fd7b231f AK |
679 | /* |
680 | * We are resuming execution after a single step fault, so the pt_regs | |
681 | * structure reflects the register state after we executed the instruction | |
34e1ceb1 | 682 | * located in the kprobe (p->ainsn.insn->bundle). We still need to adjust |
cd2675bf AK |
683 | * the ip to point back to the original stack address. To set the IP address |
684 | * to original stack address, handle the case where we need to fixup the | |
685 | * relative IP address and/or fixup branch register. | |
fd7b231f | 686 | */ |
1f7ad57b | 687 | static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 688 | { |
62c27be0 | 689 | unsigned long bundle_addr = (unsigned long) (&p->ainsn.insn->bundle); |
690 | unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL; | |
691 | unsigned long template; | |
692 | int slot = ((unsigned long)p->addr & 0xf); | |
fd7b231f | 693 | |
214ddde2 | 694 | template = p->ainsn.insn->bundle.quad0.template; |
cd2675bf | 695 | |
62c27be0 | 696 | if (slot == 1 && bundle_encoding[template][1] == L) |
697 | slot = 2; | |
cd2675bf | 698 | |
34e1ceb1 | 699 | if (p->ainsn.inst_flag & ~INST_FLAG_BOOSTABLE) { |
cd2675bf AK |
700 | |
701 | if (p->ainsn.inst_flag & INST_FLAG_FIX_RELATIVE_IP_ADDR) { | |
702 | /* Fix relative IP address */ | |
62c27be0 | 703 | regs->cr_iip = (regs->cr_iip - bundle_addr) + |
704 | resume_addr; | |
cd2675bf AK |
705 | } |
706 | ||
707 | if (p->ainsn.inst_flag & INST_FLAG_FIX_BRANCH_REG) { | |
708 | /* | |
709 | * Fix target branch register, software convention is | |
710 | * to use either b0 or b6 or b7, so just checking | |
711 | * only those registers | |
712 | */ | |
713 | switch (p->ainsn.target_br_reg) { | |
714 | case 0: | |
715 | if ((regs->b0 == bundle_addr) || | |
716 | (regs->b0 == bundle_addr + 0x10)) { | |
717 | regs->b0 = (regs->b0 - bundle_addr) + | |
718 | resume_addr; | |
719 | } | |
720 | break; | |
721 | case 6: | |
722 | if ((regs->b6 == bundle_addr) || | |
723 | (regs->b6 == bundle_addr + 0x10)) { | |
724 | regs->b6 = (regs->b6 - bundle_addr) + | |
725 | resume_addr; | |
726 | } | |
727 | break; | |
728 | case 7: | |
729 | if ((regs->b7 == bundle_addr) || | |
730 | (regs->b7 == bundle_addr + 0x10)) { | |
731 | regs->b7 = (regs->b7 - bundle_addr) + | |
732 | resume_addr; | |
733 | } | |
734 | break; | |
735 | } /* end switch */ | |
736 | } | |
737 | goto turn_ss_off; | |
738 | } | |
fd7b231f | 739 | |
cd2675bf | 740 | if (slot == 2) { |
62c27be0 | 741 | if (regs->cr_iip == bundle_addr + 0x10) { |
742 | regs->cr_iip = resume_addr + 0x10; | |
743 | } | |
744 | } else { | |
745 | if (regs->cr_iip == bundle_addr) { | |
746 | regs->cr_iip = resume_addr; | |
747 | } | |
a5403183 | 748 | } |
fd7b231f | 749 | |
cd2675bf | 750 | turn_ss_off: |
62c27be0 | 751 | /* Turn off Single Step bit */ |
752 | ia64_psr(regs)->ss = 0; | |
fd7b231f AK |
753 | } |
754 | ||
1f7ad57b | 755 | static void __kprobes prepare_ss(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 756 | { |
214ddde2 | 757 | unsigned long bundle_addr = (unsigned long) &p->ainsn.insn->bundle; |
fd7b231f AK |
758 | unsigned long slot = (unsigned long)p->addr & 0xf; |
759 | ||
deac66ae KA |
760 | /* single step inline if break instruction */ |
761 | if (p->ainsn.inst_flag == INST_FLAG_BREAK_INST) | |
762 | regs->cr_iip = (unsigned long)p->addr & ~0xFULL; | |
763 | else | |
764 | regs->cr_iip = bundle_addr & ~0xFULL; | |
fd7b231f AK |
765 | |
766 | if (slot > 2) | |
767 | slot = 0; | |
768 | ||
769 | ia64_psr(regs)->ri = slot; | |
770 | ||
771 | /* turn on single stepping */ | |
772 | ia64_psr(regs)->ss = 1; | |
773 | } | |
774 | ||
661e5a3d KA |
775 | static int __kprobes is_ia64_break_inst(struct pt_regs *regs) |
776 | { | |
777 | unsigned int slot = ia64_psr(regs)->ri; | |
661e5a3d KA |
778 | unsigned long *kprobe_addr = (unsigned long *)regs->cr_iip; |
779 | bundle_t bundle; | |
780 | ||
781 | memcpy(&bundle, kprobe_addr, sizeof(bundle_t)); | |
661e5a3d | 782 | |
34e1ceb1 | 783 | return __is_ia64_break_inst(&bundle, slot); |
661e5a3d KA |
784 | } |
785 | ||
1f7ad57b | 786 | static int __kprobes pre_kprobes_handler(struct die_args *args) |
fd7b231f AK |
787 | { |
788 | struct kprobe *p; | |
789 | int ret = 0; | |
89cb14c0 | 790 | struct pt_regs *regs = args->regs; |
fd7b231f | 791 | kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs); |
d217d545 AM |
792 | struct kprobe_ctlblk *kcb; |
793 | ||
794 | /* | |
795 | * We don't want to be preempted for the entire | |
796 | * duration of kprobe processing | |
797 | */ | |
798 | preempt_disable(); | |
799 | kcb = get_kprobe_ctlblk(); | |
fd7b231f | 800 | |
fd7b231f AK |
801 | /* Handle recursion cases */ |
802 | if (kprobe_running()) { | |
803 | p = get_kprobe(addr); | |
804 | if (p) { | |
8a5c4dc5 | 805 | if ((kcb->kprobe_status == KPROBE_HIT_SS) && |
deac66ae | 806 | (p->ainsn.inst_flag == INST_FLAG_BREAK_INST)) { |
62c27be0 | 807 | ia64_psr(regs)->ss = 0; |
fd7b231f AK |
808 | goto no_kprobe; |
809 | } | |
852caccc AK |
810 | /* We have reentered the pre_kprobe_handler(), since |
811 | * another probe was hit while within the handler. | |
812 | * We here save the original kprobes variables and | |
813 | * just single step on the instruction of the new probe | |
814 | * without calling any user handlers. | |
815 | */ | |
8a5c4dc5 AM |
816 | save_previous_kprobe(kcb); |
817 | set_current_kprobe(p, kcb); | |
bf8d5c52 | 818 | kprobes_inc_nmissed_count(p); |
852caccc | 819 | prepare_ss(p, regs); |
8a5c4dc5 | 820 | kcb->kprobe_status = KPROBE_REENTER; |
852caccc | 821 | return 1; |
89cb14c0 | 822 | } else if (args->err == __IA64_BREAK_JPROBE) { |
fd7b231f AK |
823 | /* |
824 | * jprobe instrumented function just completed | |
825 | */ | |
6065a244 | 826 | p = __this_cpu_read(current_kprobe); |
fd7b231f AK |
827 | if (p->break_handler && p->break_handler(p, regs)) { |
828 | goto ss_probe; | |
829 | } | |
eb3a7292 KA |
830 | } else if (!is_ia64_break_inst(regs)) { |
831 | /* The breakpoint instruction was removed by | |
832 | * another cpu right after we hit, no further | |
833 | * handling of this interrupt is appropriate | |
834 | */ | |
835 | ret = 1; | |
836 | goto no_kprobe; | |
89cb14c0 KA |
837 | } else { |
838 | /* Not our break */ | |
839 | goto no_kprobe; | |
fd7b231f AK |
840 | } |
841 | } | |
842 | ||
fd7b231f AK |
843 | p = get_kprobe(addr); |
844 | if (!p) { | |
661e5a3d KA |
845 | if (!is_ia64_break_inst(regs)) { |
846 | /* | |
847 | * The breakpoint instruction was removed right | |
848 | * after we hit it. Another cpu has removed | |
849 | * either a probepoint or a debugger breakpoint | |
850 | * at this address. In either case, no further | |
851 | * handling of this interrupt is appropriate. | |
852 | */ | |
853 | ret = 1; | |
854 | ||
855 | } | |
856 | ||
857 | /* Not one of our break, let kernel handle it */ | |
fd7b231f AK |
858 | goto no_kprobe; |
859 | } | |
860 | ||
8a5c4dc5 AM |
861 | set_current_kprobe(p, kcb); |
862 | kcb->kprobe_status = KPROBE_HIT_ACTIVE; | |
fd7b231f AK |
863 | |
864 | if (p->pre_handler && p->pre_handler(p, regs)) | |
865 | /* | |
866 | * Our pre-handler is specifically requesting that we just | |
9508dbfe RL |
867 | * do a return. This is used for both the jprobe pre-handler |
868 | * and the kretprobe trampoline | |
fd7b231f AK |
869 | */ |
870 | return 1; | |
871 | ||
872 | ss_probe: | |
615d0ebb | 873 | #if !defined(CONFIG_PREEMPT) |
34e1ceb1 MH |
874 | if (p->ainsn.inst_flag == INST_FLAG_BOOSTABLE && !p->post_handler) { |
875 | /* Boost up -- we can execute copied instructions directly */ | |
876 | ia64_psr(regs)->ri = p->ainsn.slot; | |
877 | regs->cr_iip = (unsigned long)&p->ainsn.insn->bundle & ~0xFULL; | |
878 | /* turn single stepping off */ | |
879 | ia64_psr(regs)->ss = 0; | |
880 | ||
881 | reset_current_kprobe(); | |
882 | preempt_enable_no_resched(); | |
883 | return 1; | |
884 | } | |
885 | #endif | |
fd7b231f | 886 | prepare_ss(p, regs); |
8a5c4dc5 | 887 | kcb->kprobe_status = KPROBE_HIT_SS; |
fd7b231f AK |
888 | return 1; |
889 | ||
890 | no_kprobe: | |
d217d545 | 891 | preempt_enable_no_resched(); |
fd7b231f AK |
892 | return ret; |
893 | } | |
894 | ||
1f7ad57b | 895 | static int __kprobes post_kprobes_handler(struct pt_regs *regs) |
fd7b231f | 896 | { |
8a5c4dc5 AM |
897 | struct kprobe *cur = kprobe_running(); |
898 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
899 | ||
900 | if (!cur) | |
fd7b231f AK |
901 | return 0; |
902 | ||
8a5c4dc5 AM |
903 | if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) { |
904 | kcb->kprobe_status = KPROBE_HIT_SSDONE; | |
905 | cur->post_handler(cur, regs, 0); | |
852caccc | 906 | } |
fd7b231f | 907 | |
8a5c4dc5 | 908 | resume_execution(cur, regs); |
fd7b231f | 909 | |
852caccc | 910 | /*Restore back the original saved kprobes variables and continue. */ |
8a5c4dc5 AM |
911 | if (kcb->kprobe_status == KPROBE_REENTER) { |
912 | restore_previous_kprobe(kcb); | |
852caccc AK |
913 | goto out; |
914 | } | |
8a5c4dc5 | 915 | reset_current_kprobe(); |
852caccc AK |
916 | |
917 | out: | |
fd7b231f AK |
918 | preempt_enable_no_resched(); |
919 | return 1; | |
920 | } | |
921 | ||
45e18c22 | 922 | int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr) |
fd7b231f | 923 | { |
8a5c4dc5 AM |
924 | struct kprobe *cur = kprobe_running(); |
925 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); | |
926 | ||
fd7b231f | 927 | |
c04c1c81 PP |
928 | switch(kcb->kprobe_status) { |
929 | case KPROBE_HIT_SS: | |
930 | case KPROBE_REENTER: | |
931 | /* | |
932 | * We are here because the instruction being single | |
933 | * stepped caused a page fault. We reset the current | |
934 | * kprobe and the instruction pointer points back to | |
935 | * the probe address and allow the page fault handler | |
936 | * to continue as a normal page fault. | |
937 | */ | |
938 | regs->cr_iip = ((unsigned long)cur->addr) & ~0xFULL; | |
939 | ia64_psr(regs)->ri = ((unsigned long)cur->addr) & 0xf; | |
940 | if (kcb->kprobe_status == KPROBE_REENTER) | |
941 | restore_previous_kprobe(kcb); | |
942 | else | |
943 | reset_current_kprobe(); | |
fd7b231f | 944 | preempt_enable_no_resched(); |
c04c1c81 PP |
945 | break; |
946 | case KPROBE_HIT_ACTIVE: | |
947 | case KPROBE_HIT_SSDONE: | |
948 | /* | |
949 | * We increment the nmissed count for accounting, | |
23d6d3db | 950 | * we can also use npre/npostfault count for accounting |
c04c1c81 PP |
951 | * these specific fault cases. |
952 | */ | |
953 | kprobes_inc_nmissed_count(cur); | |
954 | ||
955 | /* | |
956 | * We come here because instructions in the pre/post | |
957 | * handler caused the page_fault, this could happen | |
958 | * if handler tries to access user space by | |
959 | * copy_from_user(), get_user() etc. Let the | |
960 | * user-specified handler try to fix it first. | |
961 | */ | |
962 | if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr)) | |
963 | return 1; | |
fd32cb3a KA |
964 | /* |
965 | * In case the user-specified fault handler returned | |
966 | * zero, try to fix up. | |
967 | */ | |
968 | if (ia64_done_with_exception(regs)) | |
969 | return 1; | |
c04c1c81 PP |
970 | |
971 | /* | |
972 | * Let ia64_do_page_fault() fix it. | |
973 | */ | |
974 | break; | |
975 | default: | |
976 | break; | |
fd7b231f AK |
977 | } |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
1f7ad57b PP |
982 | int __kprobes kprobe_exceptions_notify(struct notifier_block *self, |
983 | unsigned long val, void *data) | |
fd7b231f AK |
984 | { |
985 | struct die_args *args = (struct die_args *)data; | |
66ff2d06 AM |
986 | int ret = NOTIFY_DONE; |
987 | ||
2326c770 | 988 | if (args->regs && user_mode(args->regs)) |
989 | return ret; | |
990 | ||
fd7b231f AK |
991 | switch(val) { |
992 | case DIE_BREAK: | |
9138d581 | 993 | /* err is break number from ia64_bad_break() */ |
08ed38b6 TL |
994 | if ((args->err >> 12) == (__IA64_BREAK_KPROBE >> 12) |
995 | || args->err == __IA64_BREAK_JPROBE | |
996 | || args->err == 0) | |
9138d581 KO |
997 | if (pre_kprobes_handler(args)) |
998 | ret = NOTIFY_STOP; | |
fd7b231f | 999 | break; |
9138d581 KO |
1000 | case DIE_FAULT: |
1001 | /* err is vector number from ia64_fault() */ | |
1002 | if (args->err == 36) | |
1003 | if (post_kprobes_handler(args->regs)) | |
1004 | ret = NOTIFY_STOP; | |
fd7b231f | 1005 | break; |
fd7b231f AK |
1006 | default: |
1007 | break; | |
1008 | } | |
66ff2d06 | 1009 | return ret; |
fd7b231f AK |
1010 | } |
1011 | ||
d3ef1f5a ZY |
1012 | struct param_bsp_cfm { |
1013 | unsigned long ip; | |
1014 | unsigned long *bsp; | |
1015 | unsigned long cfm; | |
1016 | }; | |
1017 | ||
1018 | static void ia64_get_bsp_cfm(struct unw_frame_info *info, void *arg) | |
1019 | { | |
1020 | unsigned long ip; | |
1021 | struct param_bsp_cfm *lp = arg; | |
1022 | ||
1023 | do { | |
1024 | unw_get_ip(info, &ip); | |
1025 | if (ip == 0) | |
1026 | break; | |
1027 | if (ip == lp->ip) { | |
1028 | unw_get_bsp(info, (unsigned long*)&lp->bsp); | |
1029 | unw_get_cfm(info, (unsigned long*)&lp->cfm); | |
1030 | return; | |
1031 | } | |
1032 | } while (unw_unwind(info) >= 0); | |
d61b49c1 | 1033 | lp->bsp = NULL; |
d3ef1f5a ZY |
1034 | lp->cfm = 0; |
1035 | return; | |
1036 | } | |
1037 | ||
3d7e3382 ME |
1038 | unsigned long arch_deref_entry_point(void *entry) |
1039 | { | |
1040 | return ((struct fnptr *)entry)->ip; | |
1041 | } | |
1042 | ||
1f7ad57b | 1043 | int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 1044 | { |
b2761dc2 | 1045 | struct jprobe *jp = container_of(p, struct jprobe, kp); |
3d7e3382 | 1046 | unsigned long addr = arch_deref_entry_point(jp->entry); |
8a5c4dc5 | 1047 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); |
d3ef1f5a ZY |
1048 | struct param_bsp_cfm pa; |
1049 | int bytes; | |
1050 | ||
1051 | /* | |
1052 | * Callee owns the argument space and could overwrite it, eg | |
1053 | * tail call optimization. So to be absolutely safe | |
72fdbdce | 1054 | * we save the argument space before transferring the control |
d3ef1f5a ZY |
1055 | * to instrumented jprobe function which runs in |
1056 | * the process context | |
1057 | */ | |
1058 | pa.ip = regs->cr_iip; | |
1059 | unw_init_running(ia64_get_bsp_cfm, &pa); | |
1060 | bytes = (char *)ia64_rse_skip_regs(pa.bsp, pa.cfm & 0x3f) | |
1061 | - (char *)pa.bsp; | |
1062 | memcpy( kcb->jprobes_saved_stacked_regs, | |
1063 | pa.bsp, | |
1064 | bytes ); | |
1065 | kcb->bsp = pa.bsp; | |
1066 | kcb->cfm = pa.cfm; | |
fd7b231f | 1067 | |
b2761dc2 | 1068 | /* save architectural state */ |
8a5c4dc5 | 1069 | kcb->jprobe_saved_regs = *regs; |
b2761dc2 AK |
1070 | |
1071 | /* after rfi, execute the jprobe instrumented function */ | |
1072 | regs->cr_iip = addr & ~0xFULL; | |
1073 | ia64_psr(regs)->ri = addr & 0xf; | |
1074 | regs->r1 = ((struct fnptr *)(jp->entry))->gp; | |
1075 | ||
1076 | /* | |
1077 | * fix the return address to our jprobe_inst_return() function | |
1078 | * in the jprobes.S file | |
1079 | */ | |
62c27be0 | 1080 | regs->b0 = ((struct fnptr *)(jprobe_inst_return))->ip; |
b2761dc2 AK |
1081 | |
1082 | return 1; | |
fd7b231f AK |
1083 | } |
1084 | ||
9dad6f57 AB |
1085 | /* ia64 does not need this */ |
1086 | void __kprobes jprobe_return(void) | |
1087 | { | |
1088 | } | |
1089 | ||
1f7ad57b | 1090 | int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs) |
fd7b231f | 1091 | { |
8a5c4dc5 | 1092 | struct kprobe_ctlblk *kcb = get_kprobe_ctlblk(); |
d3ef1f5a | 1093 | int bytes; |
8a5c4dc5 | 1094 | |
d3ef1f5a | 1095 | /* restoring architectural state */ |
8a5c4dc5 | 1096 | *regs = kcb->jprobe_saved_regs; |
d3ef1f5a ZY |
1097 | |
1098 | /* restoring the original argument space */ | |
1099 | flush_register_stack(); | |
1100 | bytes = (char *)ia64_rse_skip_regs(kcb->bsp, kcb->cfm & 0x3f) | |
1101 | - (char *)kcb->bsp; | |
1102 | memcpy( kcb->bsp, | |
1103 | kcb->jprobes_saved_stacked_regs, | |
1104 | bytes ); | |
1105 | invalidate_stacked_regs(); | |
1106 | ||
d217d545 | 1107 | preempt_enable_no_resched(); |
b2761dc2 | 1108 | return 1; |
fd7b231f | 1109 | } |
9508dbfe RL |
1110 | |
1111 | static struct kprobe trampoline_p = { | |
1112 | .pre_handler = trampoline_probe_handler | |
1113 | }; | |
1114 | ||
6772926b | 1115 | int __init arch_init_kprobes(void) |
9508dbfe RL |
1116 | { |
1117 | trampoline_p.addr = | |
1118 | (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip; | |
1119 | return register_kprobe(&trampoline_p); | |
1120 | } | |
bf8f6e5b AM |
1121 | |
1122 | int __kprobes arch_trampoline_kprobe(struct kprobe *p) | |
1123 | { | |
1124 | if (p->addr == | |
1125 | (kprobe_opcode_t *)((struct fnptr *)kretprobe_trampoline)->ip) | |
1126 | return 1; | |
1127 | ||
1128 | return 0; | |
1129 | } |