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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 | ||
26 | #include <linux/config.h> | |
27 | #include <linux/kprobes.h> | |
28 | #include <linux/ptrace.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/preempt.h> | |
33 | #include <linux/moduleloader.h> | |
34 | ||
35 | #include <asm/pgtable.h> | |
36 | #include <asm/kdebug.h> | |
37 | ||
b2761dc2 AK |
38 | extern void jprobe_inst_return(void); |
39 | ||
fd7b231f AK |
40 | /* kprobe_status settings */ |
41 | #define KPROBE_HIT_ACTIVE 0x00000001 | |
42 | #define KPROBE_HIT_SS 0x00000002 | |
43 | ||
44 | static struct kprobe *current_kprobe; | |
45 | static unsigned long kprobe_status; | |
b2761dc2 | 46 | static struct pt_regs jprobe_saved_regs; |
fd7b231f AK |
47 | |
48 | enum instruction_type {A, I, M, F, B, L, X, u}; | |
49 | static enum instruction_type bundle_encoding[32][3] = { | |
50 | { M, I, I }, /* 00 */ | |
51 | { M, I, I }, /* 01 */ | |
52 | { M, I, I }, /* 02 */ | |
53 | { M, I, I }, /* 03 */ | |
54 | { M, L, X }, /* 04 */ | |
55 | { M, L, X }, /* 05 */ | |
56 | { u, u, u }, /* 06 */ | |
57 | { u, u, u }, /* 07 */ | |
58 | { M, M, I }, /* 08 */ | |
59 | { M, M, I }, /* 09 */ | |
60 | { M, M, I }, /* 0A */ | |
61 | { M, M, I }, /* 0B */ | |
62 | { M, F, I }, /* 0C */ | |
63 | { M, F, I }, /* 0D */ | |
64 | { M, M, F }, /* 0E */ | |
65 | { M, M, F }, /* 0F */ | |
66 | { M, I, B }, /* 10 */ | |
67 | { M, I, B }, /* 11 */ | |
68 | { M, B, B }, /* 12 */ | |
69 | { M, B, B }, /* 13 */ | |
70 | { u, u, u }, /* 14 */ | |
71 | { u, u, u }, /* 15 */ | |
72 | { B, B, B }, /* 16 */ | |
73 | { B, B, B }, /* 17 */ | |
74 | { M, M, B }, /* 18 */ | |
75 | { M, M, B }, /* 19 */ | |
76 | { u, u, u }, /* 1A */ | |
77 | { u, u, u }, /* 1B */ | |
78 | { M, F, B }, /* 1C */ | |
79 | { M, F, B }, /* 1D */ | |
80 | { u, u, u }, /* 1E */ | |
81 | { u, u, u }, /* 1F */ | |
82 | }; | |
83 | ||
a5403183 AK |
84 | /* |
85 | * In this function we check to see if the instruction | |
86 | * is IP relative instruction and update the kprobe | |
87 | * inst flag accordingly | |
88 | */ | |
89 | static void update_kprobe_inst_flag(uint template, uint slot, uint major_opcode, | |
90 | unsigned long kprobe_inst, struct kprobe *p) | |
fd7b231f | 91 | { |
8bc76772 RL |
92 | p->ainsn.inst_flag = 0; |
93 | p->ainsn.target_br_reg = 0; | |
fd7b231f | 94 | |
a5403183 AK |
95 | if (bundle_encoding[template][slot] == B) { |
96 | switch (major_opcode) { | |
97 | case INDIRECT_CALL_OPCODE: | |
98 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
99 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
100 | break; | |
101 | case IP_RELATIVE_PREDICT_OPCODE: | |
102 | case IP_RELATIVE_BRANCH_OPCODE: | |
103 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; | |
104 | break; | |
105 | case IP_RELATIVE_CALL_OPCODE: | |
106 | p->ainsn.inst_flag |= INST_FLAG_FIX_RELATIVE_IP_ADDR; | |
107 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
108 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
109 | break; | |
110 | } | |
111 | } else if (bundle_encoding[template][slot] == X) { | |
112 | switch (major_opcode) { | |
113 | case LONG_CALL_OPCODE: | |
114 | p->ainsn.inst_flag |= INST_FLAG_FIX_BRANCH_REG; | |
115 | p->ainsn.target_br_reg = ((kprobe_inst >> 6) & 0x7); | |
116 | break; | |
117 | } | |
118 | } | |
119 | return; | |
120 | } | |
fd7b231f | 121 | |
708de8f1 AK |
122 | /* |
123 | * In this function we check to see if the instruction | |
124 | * on which we are inserting kprobe is supported. | |
125 | * Returns 0 if supported | |
126 | * Returns -EINVAL if unsupported | |
127 | */ | |
128 | static int unsupported_inst(uint template, uint slot, uint major_opcode, | |
129 | unsigned long kprobe_inst, struct kprobe *p) | |
130 | { | |
131 | unsigned long addr = (unsigned long)p->addr; | |
132 | ||
133 | if (bundle_encoding[template][slot] == I) { | |
134 | switch (major_opcode) { | |
135 | case 0x0: //I_UNIT_MISC_OPCODE: | |
136 | /* | |
137 | * Check for Integer speculation instruction | |
138 | * - Bit 33-35 to be equal to 0x1 | |
139 | */ | |
140 | if (((kprobe_inst >> 33) & 0x7) == 1) { | |
141 | printk(KERN_WARNING | |
142 | "Kprobes on speculation inst at <0x%lx> not supported\n", | |
143 | addr); | |
144 | return -EINVAL; | |
145 | } | |
146 | ||
147 | /* | |
148 | * IP relative mov instruction | |
149 | * - Bit 27-35 to be equal to 0x30 | |
150 | */ | |
151 | if (((kprobe_inst >> 27) & 0x1FF) == 0x30) { | |
152 | printk(KERN_WARNING | |
153 | "Kprobes on \"mov r1=ip\" at <0x%lx> not supported\n", | |
154 | addr); | |
155 | return -EINVAL; | |
156 | ||
157 | } | |
158 | } | |
159 | } | |
160 | return 0; | |
161 | } | |
162 | ||
163 | ||
1674eafc AK |
164 | /* |
165 | * In this function we check to see if the instruction | |
166 | * (qp) cmpx.crel.ctype p1,p2=r2,r3 | |
167 | * on which we are inserting kprobe is cmp instruction | |
168 | * with ctype as unc. | |
169 | */ | |
170 | static uint is_cmp_ctype_unc_inst(uint template, uint slot, uint major_opcode, | |
171 | unsigned long kprobe_inst) | |
172 | { | |
173 | cmp_inst_t cmp_inst; | |
174 | uint ctype_unc = 0; | |
175 | ||
176 | if (!((bundle_encoding[template][slot] == I) || | |
177 | (bundle_encoding[template][slot] == M))) | |
178 | goto out; | |
179 | ||
180 | if (!((major_opcode == 0xC) || (major_opcode == 0xD) || | |
181 | (major_opcode == 0xE))) | |
182 | goto out; | |
183 | ||
184 | cmp_inst.l = kprobe_inst; | |
185 | if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) { | |
186 | /* Integere compare - Register Register (A6 type)*/ | |
187 | if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0) | |
188 | &&(cmp_inst.f.c == 1)) | |
189 | ctype_unc = 1; | |
190 | } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) { | |
191 | /* Integere compare - Immediate Register (A8 type)*/ | |
192 | if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1)) | |
193 | ctype_unc = 1; | |
194 | } | |
195 | out: | |
196 | return ctype_unc; | |
197 | } | |
198 | ||
a5403183 AK |
199 | /* |
200 | * In this function we override the bundle with | |
201 | * the break instruction at the given slot. | |
202 | */ | |
203 | static void prepare_break_inst(uint template, uint slot, uint major_opcode, | |
204 | unsigned long kprobe_inst, struct kprobe *p) | |
205 | { | |
206 | unsigned long break_inst = BREAK_INST; | |
207 | bundle_t *bundle = &p->ainsn.insn.bundle; | |
208 | ||
209 | /* | |
210 | * Copy the original kprobe_inst qualifying predicate(qp) | |
1674eafc AK |
211 | * to the break instruction iff !is_cmp_ctype_unc_inst |
212 | * because for cmp instruction with ctype equal to unc, | |
213 | * which is a special instruction always needs to be | |
214 | * executed regradless of qp | |
a5403183 | 215 | */ |
1674eafc AK |
216 | if (!is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst)) |
217 | break_inst |= (0x3f & kprobe_inst); | |
a5403183 AK |
218 | |
219 | switch (slot) { | |
220 | case 0: | |
221 | bundle->quad0.slot0 = break_inst; | |
222 | break; | |
223 | case 1: | |
224 | bundle->quad0.slot1_p0 = break_inst; | |
225 | bundle->quad1.slot1_p1 = break_inst >> (64-46); | |
226 | break; | |
227 | case 2: | |
228 | bundle->quad1.slot2 = break_inst; | |
229 | break; | |
8bc76772 | 230 | } |
cd2675bf | 231 | |
a5403183 AK |
232 | /* |
233 | * Update the instruction flag, so that we can | |
234 | * emulate the instruction properly after we | |
235 | * single step on original instruction | |
236 | */ | |
237 | update_kprobe_inst_flag(template, slot, major_opcode, kprobe_inst, p); | |
238 | } | |
239 | ||
240 | static inline void get_kprobe_inst(bundle_t *bundle, uint slot, | |
241 | unsigned long *kprobe_inst, uint *major_opcode) | |
242 | { | |
243 | unsigned long kprobe_inst_p0, kprobe_inst_p1; | |
244 | unsigned int template; | |
245 | ||
246 | template = bundle->quad0.template; | |
fd7b231f | 247 | |
fd7b231f | 248 | switch (slot) { |
a5403183 AK |
249 | case 0: |
250 | *major_opcode = (bundle->quad0.slot0 >> SLOT0_OPCODE_SHIFT); | |
251 | *kprobe_inst = bundle->quad0.slot0; | |
fd7b231f | 252 | break; |
a5403183 AK |
253 | case 1: |
254 | *major_opcode = (bundle->quad1.slot1_p1 >> SLOT1_p1_OPCODE_SHIFT); | |
255 | kprobe_inst_p0 = bundle->quad0.slot1_p0; | |
256 | kprobe_inst_p1 = bundle->quad1.slot1_p1; | |
257 | *kprobe_inst = kprobe_inst_p0 | (kprobe_inst_p1 << (64-46)); | |
fd7b231f | 258 | break; |
a5403183 AK |
259 | case 2: |
260 | *major_opcode = (bundle->quad1.slot2 >> SLOT2_OPCODE_SHIFT); | |
261 | *kprobe_inst = bundle->quad1.slot2; | |
fd7b231f AK |
262 | break; |
263 | } | |
a5403183 | 264 | } |
fd7b231f | 265 | |
a5403183 AK |
266 | static int valid_kprobe_addr(int template, int slot, unsigned long addr) |
267 | { | |
268 | if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) { | |
269 | printk(KERN_WARNING "Attempting to insert unaligned kprobe at 0x%lx\n", | |
270 | addr); | |
271 | return -EINVAL; | |
8bc76772 | 272 | } |
a5403183 AK |
273 | return 0; |
274 | } | |
275 | ||
276 | int arch_prepare_kprobe(struct kprobe *p) | |
277 | { | |
278 | unsigned long addr = (unsigned long) p->addr; | |
279 | unsigned long *kprobe_addr = (unsigned long *)(addr & ~0xFULL); | |
280 | unsigned long kprobe_inst=0; | |
281 | unsigned int slot = addr & 0xf, template, major_opcode = 0; | |
282 | bundle_t *bundle = &p->ainsn.insn.bundle; | |
283 | ||
284 | memcpy(&p->opcode.bundle, kprobe_addr, sizeof(bundle_t)); | |
285 | memcpy(&p->ainsn.insn.bundle, kprobe_addr, sizeof(bundle_t)); | |
286 | ||
287 | template = bundle->quad0.template; | |
288 | ||
289 | if(valid_kprobe_addr(template, slot, addr)) | |
290 | return -EINVAL; | |
291 | ||
292 | /* Move to slot 2, if bundle is MLX type and kprobe slot is 1 */ | |
293 | if (slot == 1 && bundle_encoding[template][1] == L) | |
294 | slot++; | |
295 | ||
296 | /* Get kprobe_inst and major_opcode from the bundle */ | |
297 | get_kprobe_inst(bundle, slot, &kprobe_inst, &major_opcode); | |
298 | ||
708de8f1 AK |
299 | if (unsupported_inst(template, slot, major_opcode, kprobe_inst, p)) |
300 | return -EINVAL; | |
301 | ||
a5403183 | 302 | prepare_break_inst(template, slot, major_opcode, kprobe_inst, p); |
8bc76772 RL |
303 | |
304 | return 0; | |
305 | } | |
306 | ||
307 | void arch_arm_kprobe(struct kprobe *p) | |
308 | { | |
309 | unsigned long addr = (unsigned long)p->addr; | |
310 | unsigned long arm_addr = addr & ~0xFULL; | |
311 | ||
312 | memcpy((char *)arm_addr, &p->ainsn.insn.bundle, sizeof(bundle_t)); | |
fd7b231f AK |
313 | flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t)); |
314 | } | |
315 | ||
316 | void arch_disarm_kprobe(struct kprobe *p) | |
317 | { | |
318 | unsigned long addr = (unsigned long)p->addr; | |
319 | unsigned long arm_addr = addr & ~0xFULL; | |
320 | ||
321 | /* p->opcode contains the original unaltered bundle */ | |
322 | memcpy((char *) arm_addr, (char *) &p->opcode.bundle, sizeof(bundle_t)); | |
323 | flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t)); | |
324 | } | |
325 | ||
326 | void arch_remove_kprobe(struct kprobe *p) | |
327 | { | |
328 | } | |
329 | ||
330 | /* | |
331 | * We are resuming execution after a single step fault, so the pt_regs | |
332 | * structure reflects the register state after we executed the instruction | |
333 | * located in the kprobe (p->ainsn.insn.bundle). We still need to adjust | |
cd2675bf AK |
334 | * the ip to point back to the original stack address. To set the IP address |
335 | * to original stack address, handle the case where we need to fixup the | |
336 | * relative IP address and/or fixup branch register. | |
fd7b231f AK |
337 | */ |
338 | static void resume_execution(struct kprobe *p, struct pt_regs *regs) | |
339 | { | |
8bc76772 | 340 | unsigned long bundle_addr = ((unsigned long) (&p->opcode.bundle)) & ~0xFULL; |
cd2675bf AK |
341 | unsigned long resume_addr = (unsigned long)p->addr & ~0xFULL; |
342 | unsigned long template; | |
343 | int slot = ((unsigned long)p->addr & 0xf); | |
fd7b231f | 344 | |
cd2675bf AK |
345 | template = p->opcode.bundle.quad0.template; |
346 | ||
347 | if (slot == 1 && bundle_encoding[template][1] == L) | |
348 | slot = 2; | |
349 | ||
350 | if (p->ainsn.inst_flag) { | |
351 | ||
352 | if (p->ainsn.inst_flag & INST_FLAG_FIX_RELATIVE_IP_ADDR) { | |
353 | /* Fix relative IP address */ | |
354 | regs->cr_iip = (regs->cr_iip - bundle_addr) + resume_addr; | |
355 | } | |
356 | ||
357 | if (p->ainsn.inst_flag & INST_FLAG_FIX_BRANCH_REG) { | |
358 | /* | |
359 | * Fix target branch register, software convention is | |
360 | * to use either b0 or b6 or b7, so just checking | |
361 | * only those registers | |
362 | */ | |
363 | switch (p->ainsn.target_br_reg) { | |
364 | case 0: | |
365 | if ((regs->b0 == bundle_addr) || | |
366 | (regs->b0 == bundle_addr + 0x10)) { | |
367 | regs->b0 = (regs->b0 - bundle_addr) + | |
368 | resume_addr; | |
369 | } | |
370 | break; | |
371 | case 6: | |
372 | if ((regs->b6 == bundle_addr) || | |
373 | (regs->b6 == bundle_addr + 0x10)) { | |
374 | regs->b6 = (regs->b6 - bundle_addr) + | |
375 | resume_addr; | |
376 | } | |
377 | break; | |
378 | case 7: | |
379 | if ((regs->b7 == bundle_addr) || | |
380 | (regs->b7 == bundle_addr + 0x10)) { | |
381 | regs->b7 = (regs->b7 - bundle_addr) + | |
382 | resume_addr; | |
383 | } | |
384 | break; | |
385 | } /* end switch */ | |
386 | } | |
387 | goto turn_ss_off; | |
388 | } | |
fd7b231f | 389 | |
cd2675bf AK |
390 | if (slot == 2) { |
391 | if (regs->cr_iip == bundle_addr + 0x10) { | |
392 | regs->cr_iip = resume_addr + 0x10; | |
393 | } | |
394 | } else { | |
395 | if (regs->cr_iip == bundle_addr) { | |
396 | regs->cr_iip = resume_addr; | |
397 | } | |
a5403183 | 398 | } |
fd7b231f | 399 | |
cd2675bf AK |
400 | turn_ss_off: |
401 | /* Turn off Single Step bit */ | |
402 | ia64_psr(regs)->ss = 0; | |
fd7b231f AK |
403 | } |
404 | ||
405 | static void prepare_ss(struct kprobe *p, struct pt_regs *regs) | |
406 | { | |
8bc76772 | 407 | unsigned long bundle_addr = (unsigned long) &p->opcode.bundle; |
fd7b231f AK |
408 | unsigned long slot = (unsigned long)p->addr & 0xf; |
409 | ||
410 | /* Update instruction pointer (IIP) and slot number (IPSR.ri) */ | |
411 | regs->cr_iip = bundle_addr & ~0xFULL; | |
412 | ||
413 | if (slot > 2) | |
414 | slot = 0; | |
415 | ||
416 | ia64_psr(regs)->ri = slot; | |
417 | ||
418 | /* turn on single stepping */ | |
419 | ia64_psr(regs)->ss = 1; | |
420 | } | |
421 | ||
422 | static int pre_kprobes_handler(struct pt_regs *regs) | |
423 | { | |
424 | struct kprobe *p; | |
425 | int ret = 0; | |
426 | kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs); | |
427 | ||
428 | preempt_disable(); | |
429 | ||
430 | /* Handle recursion cases */ | |
431 | if (kprobe_running()) { | |
432 | p = get_kprobe(addr); | |
433 | if (p) { | |
434 | if (kprobe_status == KPROBE_HIT_SS) { | |
435 | unlock_kprobes(); | |
436 | goto no_kprobe; | |
437 | } | |
438 | arch_disarm_kprobe(p); | |
439 | ret = 1; | |
440 | } else { | |
441 | /* | |
442 | * jprobe instrumented function just completed | |
443 | */ | |
444 | p = current_kprobe; | |
445 | if (p->break_handler && p->break_handler(p, regs)) { | |
446 | goto ss_probe; | |
447 | } | |
448 | } | |
449 | } | |
450 | ||
451 | lock_kprobes(); | |
452 | p = get_kprobe(addr); | |
453 | if (!p) { | |
454 | unlock_kprobes(); | |
455 | goto no_kprobe; | |
456 | } | |
457 | ||
458 | kprobe_status = KPROBE_HIT_ACTIVE; | |
459 | current_kprobe = p; | |
460 | ||
461 | if (p->pre_handler && p->pre_handler(p, regs)) | |
462 | /* | |
463 | * Our pre-handler is specifically requesting that we just | |
464 | * do a return. This is handling the case where the | |
465 | * pre-handler is really our special jprobe pre-handler. | |
466 | */ | |
467 | return 1; | |
468 | ||
469 | ss_probe: | |
470 | prepare_ss(p, regs); | |
471 | kprobe_status = KPROBE_HIT_SS; | |
472 | return 1; | |
473 | ||
474 | no_kprobe: | |
475 | preempt_enable_no_resched(); | |
476 | return ret; | |
477 | } | |
478 | ||
479 | static int post_kprobes_handler(struct pt_regs *regs) | |
480 | { | |
481 | if (!kprobe_running()) | |
482 | return 0; | |
483 | ||
484 | if (current_kprobe->post_handler) | |
485 | current_kprobe->post_handler(current_kprobe, regs, 0); | |
486 | ||
487 | resume_execution(current_kprobe, regs); | |
488 | ||
489 | unlock_kprobes(); | |
490 | preempt_enable_no_resched(); | |
491 | return 1; | |
492 | } | |
493 | ||
494 | static int kprobes_fault_handler(struct pt_regs *regs, int trapnr) | |
495 | { | |
496 | if (!kprobe_running()) | |
497 | return 0; | |
498 | ||
499 | if (current_kprobe->fault_handler && | |
500 | current_kprobe->fault_handler(current_kprobe, regs, trapnr)) | |
501 | return 1; | |
502 | ||
503 | if (kprobe_status & KPROBE_HIT_SS) { | |
504 | resume_execution(current_kprobe, regs); | |
505 | unlock_kprobes(); | |
506 | preempt_enable_no_resched(); | |
507 | } | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, | |
513 | void *data) | |
514 | { | |
515 | struct die_args *args = (struct die_args *)data; | |
516 | switch(val) { | |
517 | case DIE_BREAK: | |
518 | if (pre_kprobes_handler(args->regs)) | |
519 | return NOTIFY_STOP; | |
520 | break; | |
521 | case DIE_SS: | |
522 | if (post_kprobes_handler(args->regs)) | |
523 | return NOTIFY_STOP; | |
524 | break; | |
525 | case DIE_PAGE_FAULT: | |
526 | if (kprobes_fault_handler(args->regs, args->trapnr)) | |
527 | return NOTIFY_STOP; | |
528 | default: | |
529 | break; | |
530 | } | |
531 | return NOTIFY_DONE; | |
532 | } | |
533 | ||
534 | int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs) | |
535 | { | |
b2761dc2 AK |
536 | struct jprobe *jp = container_of(p, struct jprobe, kp); |
537 | unsigned long addr = ((struct fnptr *)(jp->entry))->ip; | |
fd7b231f | 538 | |
b2761dc2 AK |
539 | /* save architectural state */ |
540 | jprobe_saved_regs = *regs; | |
541 | ||
542 | /* after rfi, execute the jprobe instrumented function */ | |
543 | regs->cr_iip = addr & ~0xFULL; | |
544 | ia64_psr(regs)->ri = addr & 0xf; | |
545 | regs->r1 = ((struct fnptr *)(jp->entry))->gp; | |
546 | ||
547 | /* | |
548 | * fix the return address to our jprobe_inst_return() function | |
549 | * in the jprobes.S file | |
550 | */ | |
551 | regs->b0 = ((struct fnptr *)(jprobe_inst_return))->ip; | |
552 | ||
553 | return 1; | |
fd7b231f AK |
554 | } |
555 | ||
556 | int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs) | |
557 | { | |
b2761dc2 AK |
558 | *regs = jprobe_saved_regs; |
559 | return 1; | |
fd7b231f | 560 | } |