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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Kernel support for the ptrace() and syscall tracing interfaces. | |
4 | * | |
5 | * Copyright (C) 1999-2005 Hewlett-Packard Co | |
6 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
c70f8f68 SL |
7 | * Copyright (C) 2006 Intel Co |
8 | * 2006-08-12 - IA64 Native Utrace implementation support added by | |
9 | * Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
1da177e4 LT |
10 | * |
11 | * Derived from the x86 and Alpha versions. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> | |
29930025 | 15 | #include <linux/sched/task.h> |
68db0cf1 | 16 | #include <linux/sched/task_stack.h> |
1da177e4 LT |
17 | #include <linux/mm.h> |
18 | #include <linux/errno.h> | |
19 | #include <linux/ptrace.h> | |
1da177e4 LT |
20 | #include <linux/user.h> |
21 | #include <linux/security.h> | |
22 | #include <linux/audit.h> | |
7ed20e1a | 23 | #include <linux/signal.h> |
c70f8f68 SL |
24 | #include <linux/regset.h> |
25 | #include <linux/elf.h> | |
f14488cc | 26 | #include <linux/tracehook.h> |
1da177e4 | 27 | |
1da177e4 LT |
28 | #include <asm/processor.h> |
29 | #include <asm/ptrace_offsets.h> | |
30 | #include <asm/rse.h> | |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
1da177e4 LT |
32 | #include <asm/unwind.h> |
33 | #ifdef CONFIG_PERFMON | |
34 | #include <asm/perfmon.h> | |
35 | #endif | |
36 | ||
37 | #include "entry.h" | |
38 | ||
39 | /* | |
40 | * Bits in the PSR that we allow ptrace() to change: | |
41 | * be, up, ac, mfl, mfh (the user mask; five bits total) | |
42 | * db (debug breakpoint fault; one bit) | |
43 | * id (instruction debug fault disable; one bit) | |
44 | * dd (data debug fault disable; one bit) | |
45 | * ri (restart instruction; two bits) | |
46 | * is (instruction set; one bit) | |
47 | */ | |
48 | #define IPSR_MASK (IA64_PSR_UM | IA64_PSR_DB | IA64_PSR_IS \ | |
49 | | IA64_PSR_ID | IA64_PSR_DD | IA64_PSR_RI) | |
50 | ||
51 | #define MASK(nbits) ((1UL << (nbits)) - 1) /* mask with NBITS bits set */ | |
52 | #define PFM_MASK MASK(38) | |
53 | ||
54 | #define PTRACE_DEBUG 0 | |
55 | ||
56 | #if PTRACE_DEBUG | |
57 | # define dprintk(format...) printk(format) | |
58 | # define inline | |
59 | #else | |
60 | # define dprintk(format...) | |
61 | #endif | |
62 | ||
63 | /* Return TRUE if PT was created due to kernel-entry via a system-call. */ | |
64 | ||
65 | static inline int | |
66 | in_syscall (struct pt_regs *pt) | |
67 | { | |
68 | return (long) pt->cr_ifs >= 0; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Collect the NaT bits for r1-r31 from scratch_unat and return a NaT | |
73 | * bitset where bit i is set iff the NaT bit of register i is set. | |
74 | */ | |
75 | unsigned long | |
76 | ia64_get_scratch_nat_bits (struct pt_regs *pt, unsigned long scratch_unat) | |
77 | { | |
78 | # define GET_BITS(first, last, unat) \ | |
79 | ({ \ | |
80 | unsigned long bit = ia64_unat_pos(&pt->r##first); \ | |
81 | unsigned long nbits = (last - first + 1); \ | |
82 | unsigned long mask = MASK(nbits) << first; \ | |
83 | unsigned long dist; \ | |
84 | if (bit < first) \ | |
85 | dist = 64 + bit - first; \ | |
86 | else \ | |
87 | dist = bit - first; \ | |
88 | ia64_rotr(unat, dist) & mask; \ | |
89 | }) | |
90 | unsigned long val; | |
91 | ||
92 | /* | |
93 | * Registers that are stored consecutively in struct pt_regs | |
94 | * can be handled in parallel. If the register order in | |
95 | * struct_pt_regs changes, this code MUST be updated. | |
96 | */ | |
97 | val = GET_BITS( 1, 1, scratch_unat); | |
98 | val |= GET_BITS( 2, 3, scratch_unat); | |
99 | val |= GET_BITS(12, 13, scratch_unat); | |
100 | val |= GET_BITS(14, 14, scratch_unat); | |
101 | val |= GET_BITS(15, 15, scratch_unat); | |
102 | val |= GET_BITS( 8, 11, scratch_unat); | |
103 | val |= GET_BITS(16, 31, scratch_unat); | |
104 | return val; | |
105 | ||
106 | # undef GET_BITS | |
107 | } | |
108 | ||
109 | /* | |
110 | * Set the NaT bits for the scratch registers according to NAT and | |
111 | * return the resulting unat (assuming the scratch registers are | |
112 | * stored in PT). | |
113 | */ | |
114 | unsigned long | |
115 | ia64_put_scratch_nat_bits (struct pt_regs *pt, unsigned long nat) | |
116 | { | |
117 | # define PUT_BITS(first, last, nat) \ | |
118 | ({ \ | |
119 | unsigned long bit = ia64_unat_pos(&pt->r##first); \ | |
120 | unsigned long nbits = (last - first + 1); \ | |
121 | unsigned long mask = MASK(nbits) << first; \ | |
122 | long dist; \ | |
123 | if (bit < first) \ | |
124 | dist = 64 + bit - first; \ | |
125 | else \ | |
126 | dist = bit - first; \ | |
127 | ia64_rotl(nat & mask, dist); \ | |
128 | }) | |
129 | unsigned long scratch_unat; | |
130 | ||
131 | /* | |
132 | * Registers that are stored consecutively in struct pt_regs | |
133 | * can be handled in parallel. If the register order in | |
134 | * struct_pt_regs changes, this code MUST be updated. | |
135 | */ | |
136 | scratch_unat = PUT_BITS( 1, 1, nat); | |
137 | scratch_unat |= PUT_BITS( 2, 3, nat); | |
138 | scratch_unat |= PUT_BITS(12, 13, nat); | |
139 | scratch_unat |= PUT_BITS(14, 14, nat); | |
140 | scratch_unat |= PUT_BITS(15, 15, nat); | |
141 | scratch_unat |= PUT_BITS( 8, 11, nat); | |
142 | scratch_unat |= PUT_BITS(16, 31, nat); | |
143 | ||
144 | return scratch_unat; | |
145 | ||
146 | # undef PUT_BITS | |
147 | } | |
148 | ||
149 | #define IA64_MLX_TEMPLATE 0x2 | |
150 | #define IA64_MOVL_OPCODE 6 | |
151 | ||
152 | void | |
153 | ia64_increment_ip (struct pt_regs *regs) | |
154 | { | |
155 | unsigned long w0, ri = ia64_psr(regs)->ri + 1; | |
156 | ||
157 | if (ri > 2) { | |
158 | ri = 0; | |
159 | regs->cr_iip += 16; | |
160 | } else if (ri == 2) { | |
161 | get_user(w0, (char __user *) regs->cr_iip + 0); | |
162 | if (((w0 >> 1) & 0xf) == IA64_MLX_TEMPLATE) { | |
163 | /* | |
164 | * rfi'ing to slot 2 of an MLX bundle causes | |
165 | * an illegal operation fault. We don't want | |
166 | * that to happen... | |
167 | */ | |
168 | ri = 0; | |
169 | regs->cr_iip += 16; | |
170 | } | |
171 | } | |
172 | ia64_psr(regs)->ri = ri; | |
173 | } | |
174 | ||
175 | void | |
176 | ia64_decrement_ip (struct pt_regs *regs) | |
177 | { | |
178 | unsigned long w0, ri = ia64_psr(regs)->ri - 1; | |
179 | ||
180 | if (ia64_psr(regs)->ri == 0) { | |
181 | regs->cr_iip -= 16; | |
182 | ri = 2; | |
183 | get_user(w0, (char __user *) regs->cr_iip + 0); | |
184 | if (((w0 >> 1) & 0xf) == IA64_MLX_TEMPLATE) { | |
185 | /* | |
186 | * rfi'ing to slot 2 of an MLX bundle causes | |
187 | * an illegal operation fault. We don't want | |
188 | * that to happen... | |
189 | */ | |
190 | ri = 1; | |
191 | } | |
192 | } | |
193 | ia64_psr(regs)->ri = ri; | |
194 | } | |
195 | ||
196 | /* | |
197 | * This routine is used to read an rnat bits that are stored on the | |
198 | * kernel backing store. Since, in general, the alignment of the user | |
199 | * and kernel are different, this is not completely trivial. In | |
200 | * essence, we need to construct the user RNAT based on up to two | |
201 | * kernel RNAT values and/or the RNAT value saved in the child's | |
202 | * pt_regs. | |
203 | * | |
204 | * user rbs | |
205 | * | |
206 | * +--------+ <-- lowest address | |
207 | * | slot62 | | |
208 | * +--------+ | |
209 | * | rnat | 0x....1f8 | |
210 | * +--------+ | |
211 | * | slot00 | \ | |
212 | * +--------+ | | |
213 | * | slot01 | > child_regs->ar_rnat | |
214 | * +--------+ | | |
215 | * | slot02 | / kernel rbs | |
216 | * +--------+ +--------+ | |
217 | * <- child_regs->ar_bspstore | slot61 | <-- krbs | |
218 | * +- - - - + +--------+ | |
219 | * | slot62 | | |
220 | * +- - - - + +--------+ | |
221 | * | rnat | | |
222 | * +- - - - + +--------+ | |
223 | * vrnat | slot00 | | |
224 | * +- - - - + +--------+ | |
225 | * = = | |
226 | * +--------+ | |
227 | * | slot00 | \ | |
228 | * +--------+ | | |
229 | * | slot01 | > child_stack->ar_rnat | |
230 | * +--------+ | | |
231 | * | slot02 | / | |
232 | * +--------+ | |
233 | * <--- child_stack->ar_bspstore | |
234 | * | |
235 | * The way to think of this code is as follows: bit 0 in the user rnat | |
236 | * corresponds to some bit N (0 <= N <= 62) in one of the kernel rnat | |
237 | * value. The kernel rnat value holding this bit is stored in | |
238 | * variable rnat0. rnat1 is loaded with the kernel rnat value that | |
239 | * form the upper bits of the user rnat value. | |
240 | * | |
241 | * Boundary cases: | |
242 | * | |
243 | * o when reading the rnat "below" the first rnat slot on the kernel | |
244 | * backing store, rnat0/rnat1 are set to 0 and the low order bits are | |
245 | * merged in from pt->ar_rnat. | |
246 | * | |
247 | * o when reading the rnat "above" the last rnat slot on the kernel | |
248 | * backing store, rnat0/rnat1 gets its value from sw->ar_rnat. | |
249 | */ | |
250 | static unsigned long | |
251 | get_rnat (struct task_struct *task, struct switch_stack *sw, | |
252 | unsigned long *krbs, unsigned long *urnat_addr, | |
253 | unsigned long *urbs_end) | |
254 | { | |
255 | unsigned long rnat0 = 0, rnat1 = 0, urnat = 0, *slot0_kaddr; | |
256 | unsigned long umask = 0, mask, m; | |
257 | unsigned long *kbsp, *ubspstore, *rnat0_kaddr, *rnat1_kaddr, shift; | |
258 | long num_regs, nbits; | |
259 | struct pt_regs *pt; | |
260 | ||
6450578f | 261 | pt = task_pt_regs(task); |
1da177e4 LT |
262 | kbsp = (unsigned long *) sw->ar_bspstore; |
263 | ubspstore = (unsigned long *) pt->ar_bspstore; | |
264 | ||
265 | if (urbs_end < urnat_addr) | |
266 | nbits = ia64_rse_num_regs(urnat_addr - 63, urbs_end); | |
267 | else | |
268 | nbits = 63; | |
269 | mask = MASK(nbits); | |
270 | /* | |
271 | * First, figure out which bit number slot 0 in user-land maps | |
272 | * to in the kernel rnat. Do this by figuring out how many | |
273 | * register slots we're beyond the user's backingstore and | |
274 | * then computing the equivalent address in kernel space. | |
275 | */ | |
276 | num_regs = ia64_rse_num_regs(ubspstore, urnat_addr + 1); | |
277 | slot0_kaddr = ia64_rse_skip_regs(krbs, num_regs); | |
278 | shift = ia64_rse_slot_num(slot0_kaddr); | |
279 | rnat1_kaddr = ia64_rse_rnat_addr(slot0_kaddr); | |
280 | rnat0_kaddr = rnat1_kaddr - 64; | |
281 | ||
282 | if (ubspstore + 63 > urnat_addr) { | |
283 | /* some bits need to be merged in from pt->ar_rnat */ | |
284 | umask = MASK(ia64_rse_slot_num(ubspstore)) & mask; | |
285 | urnat = (pt->ar_rnat & umask); | |
286 | mask &= ~umask; | |
287 | if (!mask) | |
288 | return urnat; | |
289 | } | |
290 | ||
291 | m = mask << shift; | |
292 | if (rnat0_kaddr >= kbsp) | |
293 | rnat0 = sw->ar_rnat; | |
294 | else if (rnat0_kaddr > krbs) | |
295 | rnat0 = *rnat0_kaddr; | |
296 | urnat |= (rnat0 & m) >> shift; | |
297 | ||
298 | m = mask >> (63 - shift); | |
299 | if (rnat1_kaddr >= kbsp) | |
300 | rnat1 = sw->ar_rnat; | |
301 | else if (rnat1_kaddr > krbs) | |
302 | rnat1 = *rnat1_kaddr; | |
303 | urnat |= (rnat1 & m) << (63 - shift); | |
304 | return urnat; | |
305 | } | |
306 | ||
307 | /* | |
308 | * The reverse of get_rnat. | |
309 | */ | |
310 | static void | |
311 | put_rnat (struct task_struct *task, struct switch_stack *sw, | |
312 | unsigned long *krbs, unsigned long *urnat_addr, unsigned long urnat, | |
313 | unsigned long *urbs_end) | |
314 | { | |
315 | unsigned long rnat0 = 0, rnat1 = 0, *slot0_kaddr, umask = 0, mask, m; | |
316 | unsigned long *kbsp, *ubspstore, *rnat0_kaddr, *rnat1_kaddr, shift; | |
317 | long num_regs, nbits; | |
318 | struct pt_regs *pt; | |
319 | unsigned long cfm, *urbs_kargs; | |
320 | ||
6450578f | 321 | pt = task_pt_regs(task); |
1da177e4 LT |
322 | kbsp = (unsigned long *) sw->ar_bspstore; |
323 | ubspstore = (unsigned long *) pt->ar_bspstore; | |
324 | ||
325 | urbs_kargs = urbs_end; | |
326 | if (in_syscall(pt)) { | |
327 | /* | |
328 | * If entered via syscall, don't allow user to set rnat bits | |
329 | * for syscall args. | |
330 | */ | |
331 | cfm = pt->cr_ifs; | |
332 | urbs_kargs = ia64_rse_skip_regs(urbs_end, -(cfm & 0x7f)); | |
333 | } | |
334 | ||
335 | if (urbs_kargs >= urnat_addr) | |
336 | nbits = 63; | |
337 | else { | |
338 | if ((urnat_addr - 63) >= urbs_kargs) | |
339 | return; | |
340 | nbits = ia64_rse_num_regs(urnat_addr - 63, urbs_kargs); | |
341 | } | |
342 | mask = MASK(nbits); | |
343 | ||
344 | /* | |
345 | * First, figure out which bit number slot 0 in user-land maps | |
346 | * to in the kernel rnat. Do this by figuring out how many | |
347 | * register slots we're beyond the user's backingstore and | |
348 | * then computing the equivalent address in kernel space. | |
349 | */ | |
350 | num_regs = ia64_rse_num_regs(ubspstore, urnat_addr + 1); | |
351 | slot0_kaddr = ia64_rse_skip_regs(krbs, num_regs); | |
352 | shift = ia64_rse_slot_num(slot0_kaddr); | |
353 | rnat1_kaddr = ia64_rse_rnat_addr(slot0_kaddr); | |
354 | rnat0_kaddr = rnat1_kaddr - 64; | |
355 | ||
356 | if (ubspstore + 63 > urnat_addr) { | |
357 | /* some bits need to be place in pt->ar_rnat: */ | |
358 | umask = MASK(ia64_rse_slot_num(ubspstore)) & mask; | |
359 | pt->ar_rnat = (pt->ar_rnat & ~umask) | (urnat & umask); | |
360 | mask &= ~umask; | |
361 | if (!mask) | |
362 | return; | |
363 | } | |
364 | /* | |
365 | * Note: Section 11.1 of the EAS guarantees that bit 63 of an | |
366 | * rnat slot is ignored. so we don't have to clear it here. | |
367 | */ | |
368 | rnat0 = (urnat << shift); | |
369 | m = mask << shift; | |
370 | if (rnat0_kaddr >= kbsp) | |
371 | sw->ar_rnat = (sw->ar_rnat & ~m) | (rnat0 & m); | |
372 | else if (rnat0_kaddr > krbs) | |
373 | *rnat0_kaddr = ((*rnat0_kaddr & ~m) | (rnat0 & m)); | |
374 | ||
375 | rnat1 = (urnat >> (63 - shift)); | |
376 | m = mask >> (63 - shift); | |
377 | if (rnat1_kaddr >= kbsp) | |
378 | sw->ar_rnat = (sw->ar_rnat & ~m) | (rnat1 & m); | |
379 | else if (rnat1_kaddr > krbs) | |
380 | *rnat1_kaddr = ((*rnat1_kaddr & ~m) | (rnat1 & m)); | |
381 | } | |
382 | ||
383 | static inline int | |
384 | on_kernel_rbs (unsigned long addr, unsigned long bspstore, | |
385 | unsigned long urbs_end) | |
386 | { | |
387 | unsigned long *rnat_addr = ia64_rse_rnat_addr((unsigned long *) | |
388 | urbs_end); | |
389 | return (addr >= bspstore && addr <= (unsigned long) rnat_addr); | |
390 | } | |
391 | ||
392 | /* | |
393 | * Read a word from the user-level backing store of task CHILD. ADDR | |
394 | * is the user-level address to read the word from, VAL a pointer to | |
395 | * the return value, and USER_BSP gives the end of the user-level | |
396 | * backing store (i.e., it's the address that would be in ar.bsp after | |
397 | * the user executed a "cover" instruction). | |
398 | * | |
399 | * This routine takes care of accessing the kernel register backing | |
400 | * store for those registers that got spilled there. It also takes | |
401 | * care of calculating the appropriate RNaT collection words. | |
402 | */ | |
403 | long | |
404 | ia64_peek (struct task_struct *child, struct switch_stack *child_stack, | |
405 | unsigned long user_rbs_end, unsigned long addr, long *val) | |
406 | { | |
407 | unsigned long *bspstore, *krbs, regnum, *laddr, *urbs_end, *rnat_addr; | |
408 | struct pt_regs *child_regs; | |
409 | size_t copied; | |
410 | long ret; | |
411 | ||
412 | urbs_end = (long *) user_rbs_end; | |
413 | laddr = (unsigned long *) addr; | |
6450578f | 414 | child_regs = task_pt_regs(child); |
1da177e4 LT |
415 | bspstore = (unsigned long *) child_regs->ar_bspstore; |
416 | krbs = (unsigned long *) child + IA64_RBS_OFFSET/8; | |
417 | if (on_kernel_rbs(addr, (unsigned long) bspstore, | |
418 | (unsigned long) urbs_end)) | |
419 | { | |
420 | /* | |
421 | * Attempt to read the RBS in an area that's actually | |
422 | * on the kernel RBS => read the corresponding bits in | |
423 | * the kernel RBS. | |
424 | */ | |
425 | rnat_addr = ia64_rse_rnat_addr(laddr); | |
426 | ret = get_rnat(child, child_stack, krbs, rnat_addr, urbs_end); | |
427 | ||
428 | if (laddr == rnat_addr) { | |
429 | /* return NaT collection word itself */ | |
430 | *val = ret; | |
431 | return 0; | |
432 | } | |
433 | ||
434 | if (((1UL << ia64_rse_slot_num(laddr)) & ret) != 0) { | |
435 | /* | |
436 | * It is implementation dependent whether the | |
437 | * data portion of a NaT value gets saved on a | |
438 | * st8.spill or RSE spill (e.g., see EAS 2.6, | |
439 | * 4.4.4.6 Register Spill and Fill). To get | |
440 | * consistent behavior across all possible | |
441 | * IA-64 implementations, we return zero in | |
442 | * this case. | |
443 | */ | |
444 | *val = 0; | |
445 | return 0; | |
446 | } | |
447 | ||
448 | if (laddr < urbs_end) { | |
449 | /* | |
450 | * The desired word is on the kernel RBS and | |
451 | * is not a NaT. | |
452 | */ | |
453 | regnum = ia64_rse_num_regs(bspstore, laddr); | |
454 | *val = *ia64_rse_skip_regs(krbs, regnum); | |
455 | return 0; | |
456 | } | |
457 | } | |
f307ab6d | 458 | copied = access_process_vm(child, addr, &ret, sizeof(ret), FOLL_FORCE); |
1da177e4 LT |
459 | if (copied != sizeof(ret)) |
460 | return -EIO; | |
461 | *val = ret; | |
462 | return 0; | |
463 | } | |
464 | ||
465 | long | |
466 | ia64_poke (struct task_struct *child, struct switch_stack *child_stack, | |
467 | unsigned long user_rbs_end, unsigned long addr, long val) | |
468 | { | |
469 | unsigned long *bspstore, *krbs, regnum, *laddr; | |
470 | unsigned long *urbs_end = (long *) user_rbs_end; | |
471 | struct pt_regs *child_regs; | |
472 | ||
473 | laddr = (unsigned long *) addr; | |
6450578f | 474 | child_regs = task_pt_regs(child); |
1da177e4 LT |
475 | bspstore = (unsigned long *) child_regs->ar_bspstore; |
476 | krbs = (unsigned long *) child + IA64_RBS_OFFSET/8; | |
477 | if (on_kernel_rbs(addr, (unsigned long) bspstore, | |
478 | (unsigned long) urbs_end)) | |
479 | { | |
480 | /* | |
481 | * Attempt to write the RBS in an area that's actually | |
482 | * on the kernel RBS => write the corresponding bits | |
483 | * in the kernel RBS. | |
484 | */ | |
485 | if (ia64_rse_is_rnat_slot(laddr)) | |
486 | put_rnat(child, child_stack, krbs, laddr, val, | |
487 | urbs_end); | |
488 | else { | |
489 | if (laddr < urbs_end) { | |
490 | regnum = ia64_rse_num_regs(bspstore, laddr); | |
491 | *ia64_rse_skip_regs(krbs, regnum) = val; | |
492 | } | |
493 | } | |
f307ab6d LS |
494 | } else if (access_process_vm(child, addr, &val, sizeof(val), |
495 | FOLL_FORCE | FOLL_WRITE) | |
1da177e4 LT |
496 | != sizeof(val)) |
497 | return -EIO; | |
498 | return 0; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Calculate the address of the end of the user-level register backing | |
503 | * store. This is the address that would have been stored in ar.bsp | |
504 | * if the user had executed a "cover" instruction right before | |
505 | * entering the kernel. If CFMP is not NULL, it is used to return the | |
506 | * "current frame mask" that was active at the time the kernel was | |
507 | * entered. | |
508 | */ | |
509 | unsigned long | |
510 | ia64_get_user_rbs_end (struct task_struct *child, struct pt_regs *pt, | |
511 | unsigned long *cfmp) | |
512 | { | |
513 | unsigned long *krbs, *bspstore, cfm = pt->cr_ifs; | |
514 | long ndirty; | |
515 | ||
516 | krbs = (unsigned long *) child + IA64_RBS_OFFSET/8; | |
517 | bspstore = (unsigned long *) pt->ar_bspstore; | |
518 | ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19)); | |
519 | ||
520 | if (in_syscall(pt)) | |
521 | ndirty += (cfm & 0x7f); | |
522 | else | |
523 | cfm &= ~(1UL << 63); /* clear valid bit */ | |
524 | ||
525 | if (cfmp) | |
526 | *cfmp = cfm; | |
527 | return (unsigned long) ia64_rse_skip_regs(bspstore, ndirty); | |
528 | } | |
529 | ||
530 | /* | |
531 | * Synchronize (i.e, write) the RSE backing store living in kernel | |
532 | * space to the VM of the CHILD task. SW and PT are the pointers to | |
533 | * the switch_stack and pt_regs structures, respectively. | |
534 | * USER_RBS_END is the user-level address at which the backing store | |
535 | * ends. | |
536 | */ | |
537 | long | |
538 | ia64_sync_user_rbs (struct task_struct *child, struct switch_stack *sw, | |
539 | unsigned long user_rbs_start, unsigned long user_rbs_end) | |
540 | { | |
541 | unsigned long addr, val; | |
542 | long ret; | |
543 | ||
544 | /* now copy word for word from kernel rbs to user rbs: */ | |
545 | for (addr = user_rbs_start; addr < user_rbs_end; addr += 8) { | |
546 | ret = ia64_peek(child, sw, user_rbs_end, addr, &val); | |
547 | if (ret < 0) | |
548 | return ret; | |
f307ab6d LS |
549 | if (access_process_vm(child, addr, &val, sizeof(val), |
550 | FOLL_FORCE | FOLL_WRITE) | |
1da177e4 LT |
551 | != sizeof(val)) |
552 | return -EIO; | |
553 | } | |
554 | return 0; | |
555 | } | |
556 | ||
3b2ce0b1 PT |
557 | static long |
558 | ia64_sync_kernel_rbs (struct task_struct *child, struct switch_stack *sw, | |
559 | unsigned long user_rbs_start, unsigned long user_rbs_end) | |
560 | { | |
561 | unsigned long addr, val; | |
562 | long ret; | |
563 | ||
564 | /* now copy word for word from user rbs to kernel rbs: */ | |
565 | for (addr = user_rbs_start; addr < user_rbs_end; addr += 8) { | |
f307ab6d LS |
566 | if (access_process_vm(child, addr, &val, sizeof(val), |
567 | FOLL_FORCE) | |
3b2ce0b1 PT |
568 | != sizeof(val)) |
569 | return -EIO; | |
570 | ||
571 | ret = ia64_poke(child, sw, user_rbs_end, addr, val); | |
572 | if (ret < 0) | |
573 | return ret; | |
574 | } | |
575 | return 0; | |
576 | } | |
577 | ||
578 | typedef long (*syncfunc_t)(struct task_struct *, struct switch_stack *, | |
579 | unsigned long, unsigned long); | |
580 | ||
581 | static void do_sync_rbs(struct unw_frame_info *info, void *arg) | |
582 | { | |
583 | struct pt_regs *pt; | |
584 | unsigned long urbs_end; | |
585 | syncfunc_t fn = arg; | |
586 | ||
587 | if (unw_unwind_to_user(info) < 0) | |
588 | return; | |
589 | pt = task_pt_regs(info->task); | |
590 | urbs_end = ia64_get_user_rbs_end(info->task, pt, NULL); | |
591 | ||
592 | fn(info->task, info->sw, pt->ar_bspstore, urbs_end); | |
593 | } | |
594 | ||
595 | /* | |
596 | * when a thread is stopped (ptraced), debugger might change thread's user | |
597 | * stack (change memory directly), and we must avoid the RSE stored in kernel | |
598 | * to override user stack (user space's RSE is newer than kernel's in the | |
599 | * case). To workaround the issue, we copy kernel RSE to user RSE before the | |
600 | * task is stopped, so user RSE has updated data. we then copy user RSE to | |
601 | * kernel after the task is resummed from traced stop and kernel will use the | |
602 | * newer RSE to return to user. TIF_RESTORE_RSE is the flag to indicate we need | |
603 | * synchronize user RSE to kernel. | |
604 | */ | |
605 | void ia64_ptrace_stop(void) | |
606 | { | |
607 | if (test_and_set_tsk_thread_flag(current, TIF_RESTORE_RSE)) | |
608 | return; | |
f14488cc | 609 | set_notify_resume(current); |
3b2ce0b1 PT |
610 | unw_init_running(do_sync_rbs, ia64_sync_user_rbs); |
611 | } | |
612 | ||
613 | /* | |
614 | * This is called to read back the register backing store. | |
615 | */ | |
616 | void ia64_sync_krbs(void) | |
617 | { | |
618 | clear_tsk_thread_flag(current, TIF_RESTORE_RSE); | |
3b2ce0b1 PT |
619 | |
620 | unw_init_running(do_sync_rbs, ia64_sync_kernel_rbs); | |
621 | } | |
622 | ||
aa91a2e9 PT |
623 | /* |
624 | * After PTRACE_ATTACH, a thread's register backing store area in user | |
625 | * space is assumed to contain correct data whenever the thread is | |
626 | * stopped. arch_ptrace_stop takes care of this on tracing stops. | |
627 | * But if the child was already stopped for job control when we attach | |
628 | * to it, then it might not ever get into ptrace_stop by the time we | |
629 | * want to examine the user memory containing the RBS. | |
630 | */ | |
631 | void | |
632 | ptrace_attach_sync_user_rbs (struct task_struct *child) | |
633 | { | |
634 | int stopped = 0; | |
635 | struct unw_frame_info info; | |
636 | ||
637 | /* | |
638 | * If the child is in TASK_STOPPED, we need to change that to | |
639 | * TASK_TRACED momentarily while we operate on it. This ensures | |
640 | * that the child won't be woken up and return to user mode while | |
641 | * we are doing the sync. (It can only be woken up for SIGKILL.) | |
642 | */ | |
643 | ||
644 | read_lock(&tasklist_lock); | |
ffdf9185 | 645 | if (child->sighand) { |
aa91a2e9 PT |
646 | spin_lock_irq(&child->sighand->siglock); |
647 | if (child->state == TASK_STOPPED && | |
648 | !test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) { | |
f14488cc | 649 | set_notify_resume(child); |
aa91a2e9 PT |
650 | |
651 | child->state = TASK_TRACED; | |
652 | stopped = 1; | |
653 | } | |
654 | spin_unlock_irq(&child->sighand->siglock); | |
655 | } | |
656 | read_unlock(&tasklist_lock); | |
657 | ||
658 | if (!stopped) | |
659 | return; | |
660 | ||
661 | unw_init_from_blocked_task(&info, child); | |
662 | do_sync_rbs(&info, ia64_sync_user_rbs); | |
663 | ||
664 | /* | |
665 | * Now move the child back into TASK_STOPPED if it should be in a | |
666 | * job control stop, so that SIGCONT can be used to wake it up. | |
667 | */ | |
668 | read_lock(&tasklist_lock); | |
ffdf9185 | 669 | if (child->sighand) { |
aa91a2e9 PT |
670 | spin_lock_irq(&child->sighand->siglock); |
671 | if (child->state == TASK_TRACED && | |
672 | (child->signal->flags & SIGNAL_STOP_STOPPED)) { | |
673 | child->state = TASK_STOPPED; | |
674 | } | |
675 | spin_unlock_irq(&child->sighand->siglock); | |
676 | } | |
677 | read_unlock(&tasklist_lock); | |
678 | } | |
679 | ||
1da177e4 LT |
680 | /* |
681 | * Write f32-f127 back to task->thread.fph if it has been modified. | |
682 | */ | |
683 | inline void | |
684 | ia64_flush_fph (struct task_struct *task) | |
685 | { | |
6450578f | 686 | struct ia64_psr *psr = ia64_psr(task_pt_regs(task)); |
1da177e4 | 687 | |
05062d96 PC |
688 | /* |
689 | * Prevent migrating this task while | |
690 | * we're fiddling with the FPU state | |
691 | */ | |
692 | preempt_disable(); | |
1da177e4 LT |
693 | if (ia64_is_local_fpu_owner(task) && psr->mfh) { |
694 | psr->mfh = 0; | |
695 | task->thread.flags |= IA64_THREAD_FPH_VALID; | |
696 | ia64_save_fpu(&task->thread.fph[0]); | |
697 | } | |
05062d96 | 698 | preempt_enable(); |
1da177e4 LT |
699 | } |
700 | ||
701 | /* | |
702 | * Sync the fph state of the task so that it can be manipulated | |
703 | * through thread.fph. If necessary, f32-f127 are written back to | |
704 | * thread.fph or, if the fph state hasn't been used before, thread.fph | |
705 | * is cleared to zeroes. Also, access to f32-f127 is disabled to | |
706 | * ensure that the task picks up the state from thread.fph when it | |
707 | * executes again. | |
708 | */ | |
709 | void | |
710 | ia64_sync_fph (struct task_struct *task) | |
711 | { | |
6450578f | 712 | struct ia64_psr *psr = ia64_psr(task_pt_regs(task)); |
1da177e4 LT |
713 | |
714 | ia64_flush_fph(task); | |
715 | if (!(task->thread.flags & IA64_THREAD_FPH_VALID)) { | |
716 | task->thread.flags |= IA64_THREAD_FPH_VALID; | |
717 | memset(&task->thread.fph, 0, sizeof(task->thread.fph)); | |
718 | } | |
719 | ia64_drop_fpu(task); | |
720 | psr->dfh = 1; | |
721 | } | |
722 | ||
1da177e4 LT |
723 | /* |
724 | * Change the machine-state of CHILD such that it will return via the normal | |
725 | * kernel exit-path, rather than the syscall-exit path. | |
726 | */ | |
727 | static void | |
728 | convert_to_non_syscall (struct task_struct *child, struct pt_regs *pt, | |
729 | unsigned long cfm) | |
730 | { | |
731 | struct unw_frame_info info, prev_info; | |
02a017a9 | 732 | unsigned long ip, sp, pr; |
1da177e4 LT |
733 | |
734 | unw_init_from_blocked_task(&info, child); | |
735 | while (1) { | |
736 | prev_info = info; | |
737 | if (unw_unwind(&info) < 0) | |
738 | return; | |
02a017a9 DMT |
739 | |
740 | unw_get_sp(&info, &sp); | |
741 | if ((long)((unsigned long)child + IA64_STK_OFFSET - sp) | |
742 | < IA64_PT_REGS_SIZE) { | |
743 | dprintk("ptrace.%s: ran off the top of the kernel " | |
d4ed8084 | 744 | "stack\n", __func__); |
02a017a9 DMT |
745 | return; |
746 | } | |
747 | if (unw_get_pr (&prev_info, &pr) < 0) { | |
748 | unw_get_rp(&prev_info, &ip); | |
749 | dprintk("ptrace.%s: failed to read " | |
750 | "predicate register (ip=0x%lx)\n", | |
d4ed8084 | 751 | __func__, ip); |
1da177e4 | 752 | return; |
02a017a9 DMT |
753 | } |
754 | if (unw_is_intr_frame(&info) | |
755 | && (pr & (1UL << PRED_USER_STACK))) | |
1da177e4 LT |
756 | break; |
757 | } | |
758 | ||
7f9eaedf DMT |
759 | /* |
760 | * Note: at the time of this call, the target task is blocked | |
761 | * in notify_resume_user() and by clearling PRED_LEAVE_SYSCALL | |
762 | * (aka, "pLvSys") we redirect execution from | |
763 | * .work_pending_syscall_end to .work_processed_kernel. | |
764 | */ | |
1da177e4 | 765 | unw_get_pr(&prev_info, &pr); |
7f9eaedf | 766 | pr &= ~((1UL << PRED_SYSCALL) | (1UL << PRED_LEAVE_SYSCALL)); |
1da177e4 LT |
767 | pr |= (1UL << PRED_NON_SYSCALL); |
768 | unw_set_pr(&prev_info, pr); | |
769 | ||
770 | pt->cr_ifs = (1UL << 63) | cfm; | |
7f9eaedf DMT |
771 | /* |
772 | * Clear the memory that is NOT written on syscall-entry to | |
773 | * ensure we do not leak kernel-state to user when execution | |
774 | * resumes. | |
775 | */ | |
776 | pt->r2 = 0; | |
777 | pt->r3 = 0; | |
778 | pt->r14 = 0; | |
779 | memset(&pt->r16, 0, 16*8); /* clear r16-r31 */ | |
780 | memset(&pt->f6, 0, 6*16); /* clear f6-f11 */ | |
781 | pt->b7 = 0; | |
782 | pt->ar_ccv = 0; | |
783 | pt->ar_csd = 0; | |
784 | pt->ar_ssd = 0; | |
1da177e4 LT |
785 | } |
786 | ||
787 | static int | |
788 | access_nat_bits (struct task_struct *child, struct pt_regs *pt, | |
789 | struct unw_frame_info *info, | |
790 | unsigned long *data, int write_access) | |
791 | { | |
792 | unsigned long regnum, nat_bits, scratch_unat, dummy = 0; | |
793 | char nat = 0; | |
794 | ||
795 | if (write_access) { | |
796 | nat_bits = *data; | |
797 | scratch_unat = ia64_put_scratch_nat_bits(pt, nat_bits); | |
798 | if (unw_set_ar(info, UNW_AR_UNAT, scratch_unat) < 0) { | |
799 | dprintk("ptrace: failed to set ar.unat\n"); | |
800 | return -1; | |
801 | } | |
802 | for (regnum = 4; regnum <= 7; ++regnum) { | |
803 | unw_get_gr(info, regnum, &dummy, &nat); | |
804 | unw_set_gr(info, regnum, dummy, | |
805 | (nat_bits >> regnum) & 1); | |
806 | } | |
807 | } else { | |
808 | if (unw_get_ar(info, UNW_AR_UNAT, &scratch_unat) < 0) { | |
809 | dprintk("ptrace: failed to read ar.unat\n"); | |
810 | return -1; | |
811 | } | |
812 | nat_bits = ia64_get_scratch_nat_bits(pt, scratch_unat); | |
813 | for (regnum = 4; regnum <= 7; ++regnum) { | |
814 | unw_get_gr(info, regnum, &dummy, &nat); | |
815 | nat_bits |= (nat != 0) << regnum; | |
816 | } | |
817 | *data = nat_bits; | |
818 | } | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static int | |
823 | access_uarea (struct task_struct *child, unsigned long addr, | |
4cd8dc83 | 824 | unsigned long *data, int write_access); |
1da177e4 LT |
825 | |
826 | static long | |
827 | ptrace_getregs (struct task_struct *child, struct pt_all_user_regs __user *ppr) | |
828 | { | |
829 | unsigned long psr, ec, lc, rnat, bsp, cfm, nat_bits, val; | |
830 | struct unw_frame_info info; | |
831 | struct ia64_fpreg fpval; | |
832 | struct switch_stack *sw; | |
833 | struct pt_regs *pt; | |
834 | long ret, retval = 0; | |
835 | char nat = 0; | |
836 | int i; | |
837 | ||
96d4f267 | 838 | if (!access_ok(ppr, sizeof(struct pt_all_user_regs))) |
1da177e4 LT |
839 | return -EIO; |
840 | ||
6450578f | 841 | pt = task_pt_regs(child); |
1da177e4 LT |
842 | sw = (struct switch_stack *) (child->thread.ksp + 16); |
843 | unw_init_from_blocked_task(&info, child); | |
844 | if (unw_unwind_to_user(&info) < 0) { | |
845 | return -EIO; | |
846 | } | |
847 | ||
848 | if (((unsigned long) ppr & 0x7) != 0) { | |
849 | dprintk("ptrace:unaligned register address %p\n", ppr); | |
850 | return -EIO; | |
851 | } | |
852 | ||
853 | if (access_uarea(child, PT_CR_IPSR, &psr, 0) < 0 | |
854 | || access_uarea(child, PT_AR_EC, &ec, 0) < 0 | |
855 | || access_uarea(child, PT_AR_LC, &lc, 0) < 0 | |
856 | || access_uarea(child, PT_AR_RNAT, &rnat, 0) < 0 | |
857 | || access_uarea(child, PT_AR_BSP, &bsp, 0) < 0 | |
858 | || access_uarea(child, PT_CFM, &cfm, 0) | |
859 | || access_uarea(child, PT_NAT_BITS, &nat_bits, 0)) | |
860 | return -EIO; | |
861 | ||
862 | /* control regs */ | |
863 | ||
864 | retval |= __put_user(pt->cr_iip, &ppr->cr_iip); | |
865 | retval |= __put_user(psr, &ppr->cr_ipsr); | |
866 | ||
867 | /* app regs */ | |
868 | ||
869 | retval |= __put_user(pt->ar_pfs, &ppr->ar[PT_AUR_PFS]); | |
870 | retval |= __put_user(pt->ar_rsc, &ppr->ar[PT_AUR_RSC]); | |
871 | retval |= __put_user(pt->ar_bspstore, &ppr->ar[PT_AUR_BSPSTORE]); | |
872 | retval |= __put_user(pt->ar_unat, &ppr->ar[PT_AUR_UNAT]); | |
873 | retval |= __put_user(pt->ar_ccv, &ppr->ar[PT_AUR_CCV]); | |
874 | retval |= __put_user(pt->ar_fpsr, &ppr->ar[PT_AUR_FPSR]); | |
875 | ||
876 | retval |= __put_user(ec, &ppr->ar[PT_AUR_EC]); | |
877 | retval |= __put_user(lc, &ppr->ar[PT_AUR_LC]); | |
878 | retval |= __put_user(rnat, &ppr->ar[PT_AUR_RNAT]); | |
879 | retval |= __put_user(bsp, &ppr->ar[PT_AUR_BSP]); | |
880 | retval |= __put_user(cfm, &ppr->cfm); | |
881 | ||
882 | /* gr1-gr3 */ | |
883 | ||
884 | retval |= __copy_to_user(&ppr->gr[1], &pt->r1, sizeof(long)); | |
885 | retval |= __copy_to_user(&ppr->gr[2], &pt->r2, sizeof(long) *2); | |
886 | ||
887 | /* gr4-gr7 */ | |
888 | ||
889 | for (i = 4; i < 8; i++) { | |
890 | if (unw_access_gr(&info, i, &val, &nat, 0) < 0) | |
891 | return -EIO; | |
892 | retval |= __put_user(val, &ppr->gr[i]); | |
893 | } | |
894 | ||
895 | /* gr8-gr11 */ | |
896 | ||
897 | retval |= __copy_to_user(&ppr->gr[8], &pt->r8, sizeof(long) * 4); | |
898 | ||
899 | /* gr12-gr15 */ | |
900 | ||
901 | retval |= __copy_to_user(&ppr->gr[12], &pt->r12, sizeof(long) * 2); | |
902 | retval |= __copy_to_user(&ppr->gr[14], &pt->r14, sizeof(long)); | |
903 | retval |= __copy_to_user(&ppr->gr[15], &pt->r15, sizeof(long)); | |
904 | ||
905 | /* gr16-gr31 */ | |
906 | ||
907 | retval |= __copy_to_user(&ppr->gr[16], &pt->r16, sizeof(long) * 16); | |
908 | ||
909 | /* b0 */ | |
910 | ||
911 | retval |= __put_user(pt->b0, &ppr->br[0]); | |
912 | ||
913 | /* b1-b5 */ | |
914 | ||
915 | for (i = 1; i < 6; i++) { | |
916 | if (unw_access_br(&info, i, &val, 0) < 0) | |
917 | return -EIO; | |
918 | __put_user(val, &ppr->br[i]); | |
919 | } | |
920 | ||
921 | /* b6-b7 */ | |
922 | ||
923 | retval |= __put_user(pt->b6, &ppr->br[6]); | |
924 | retval |= __put_user(pt->b7, &ppr->br[7]); | |
925 | ||
926 | /* fr2-fr5 */ | |
927 | ||
928 | for (i = 2; i < 6; i++) { | |
929 | if (unw_get_fr(&info, i, &fpval) < 0) | |
930 | return -EIO; | |
931 | retval |= __copy_to_user(&ppr->fr[i], &fpval, sizeof (fpval)); | |
932 | } | |
933 | ||
934 | /* fr6-fr11 */ | |
935 | ||
936 | retval |= __copy_to_user(&ppr->fr[6], &pt->f6, | |
937 | sizeof(struct ia64_fpreg) * 6); | |
938 | ||
939 | /* fp scratch regs(12-15) */ | |
940 | ||
941 | retval |= __copy_to_user(&ppr->fr[12], &sw->f12, | |
942 | sizeof(struct ia64_fpreg) * 4); | |
943 | ||
944 | /* fr16-fr31 */ | |
945 | ||
946 | for (i = 16; i < 32; i++) { | |
947 | if (unw_get_fr(&info, i, &fpval) < 0) | |
948 | return -EIO; | |
949 | retval |= __copy_to_user(&ppr->fr[i], &fpval, sizeof (fpval)); | |
950 | } | |
951 | ||
952 | /* fph */ | |
953 | ||
954 | ia64_flush_fph(child); | |
955 | retval |= __copy_to_user(&ppr->fr[32], &child->thread.fph, | |
956 | sizeof(ppr->fr[32]) * 96); | |
957 | ||
958 | /* preds */ | |
959 | ||
960 | retval |= __put_user(pt->pr, &ppr->pr); | |
961 | ||
962 | /* nat bits */ | |
963 | ||
964 | retval |= __put_user(nat_bits, &ppr->nat); | |
965 | ||
966 | ret = retval ? -EIO : 0; | |
967 | return ret; | |
968 | } | |
969 | ||
970 | static long | |
971 | ptrace_setregs (struct task_struct *child, struct pt_all_user_regs __user *ppr) | |
972 | { | |
4ea78729 | 973 | unsigned long psr, rsc, ec, lc, rnat, bsp, cfm, nat_bits, val = 0; |
1da177e4 LT |
974 | struct unw_frame_info info; |
975 | struct switch_stack *sw; | |
976 | struct ia64_fpreg fpval; | |
977 | struct pt_regs *pt; | |
978 | long ret, retval = 0; | |
979 | int i; | |
980 | ||
981 | memset(&fpval, 0, sizeof(fpval)); | |
982 | ||
96d4f267 | 983 | if (!access_ok(ppr, sizeof(struct pt_all_user_regs))) |
1da177e4 LT |
984 | return -EIO; |
985 | ||
6450578f | 986 | pt = task_pt_regs(child); |
1da177e4 LT |
987 | sw = (struct switch_stack *) (child->thread.ksp + 16); |
988 | unw_init_from_blocked_task(&info, child); | |
989 | if (unw_unwind_to_user(&info) < 0) { | |
990 | return -EIO; | |
991 | } | |
992 | ||
993 | if (((unsigned long) ppr & 0x7) != 0) { | |
994 | dprintk("ptrace:unaligned register address %p\n", ppr); | |
995 | return -EIO; | |
996 | } | |
997 | ||
998 | /* control regs */ | |
999 | ||
1000 | retval |= __get_user(pt->cr_iip, &ppr->cr_iip); | |
1001 | retval |= __get_user(psr, &ppr->cr_ipsr); | |
1002 | ||
1003 | /* app regs */ | |
1004 | ||
1005 | retval |= __get_user(pt->ar_pfs, &ppr->ar[PT_AUR_PFS]); | |
4ea78729 | 1006 | retval |= __get_user(rsc, &ppr->ar[PT_AUR_RSC]); |
1da177e4 LT |
1007 | retval |= __get_user(pt->ar_bspstore, &ppr->ar[PT_AUR_BSPSTORE]); |
1008 | retval |= __get_user(pt->ar_unat, &ppr->ar[PT_AUR_UNAT]); | |
1009 | retval |= __get_user(pt->ar_ccv, &ppr->ar[PT_AUR_CCV]); | |
1010 | retval |= __get_user(pt->ar_fpsr, &ppr->ar[PT_AUR_FPSR]); | |
1011 | ||
1012 | retval |= __get_user(ec, &ppr->ar[PT_AUR_EC]); | |
1013 | retval |= __get_user(lc, &ppr->ar[PT_AUR_LC]); | |
1014 | retval |= __get_user(rnat, &ppr->ar[PT_AUR_RNAT]); | |
1015 | retval |= __get_user(bsp, &ppr->ar[PT_AUR_BSP]); | |
1016 | retval |= __get_user(cfm, &ppr->cfm); | |
1017 | ||
1018 | /* gr1-gr3 */ | |
1019 | ||
1020 | retval |= __copy_from_user(&pt->r1, &ppr->gr[1], sizeof(long)); | |
1021 | retval |= __copy_from_user(&pt->r2, &ppr->gr[2], sizeof(long) * 2); | |
1022 | ||
1023 | /* gr4-gr7 */ | |
1024 | ||
1025 | for (i = 4; i < 8; i++) { | |
1026 | retval |= __get_user(val, &ppr->gr[i]); | |
1027 | /* NaT bit will be set via PT_NAT_BITS: */ | |
1028 | if (unw_set_gr(&info, i, val, 0) < 0) | |
1029 | return -EIO; | |
1030 | } | |
1031 | ||
1032 | /* gr8-gr11 */ | |
1033 | ||
1034 | retval |= __copy_from_user(&pt->r8, &ppr->gr[8], sizeof(long) * 4); | |
1035 | ||
1036 | /* gr12-gr15 */ | |
1037 | ||
1038 | retval |= __copy_from_user(&pt->r12, &ppr->gr[12], sizeof(long) * 2); | |
1039 | retval |= __copy_from_user(&pt->r14, &ppr->gr[14], sizeof(long)); | |
1040 | retval |= __copy_from_user(&pt->r15, &ppr->gr[15], sizeof(long)); | |
1041 | ||
1042 | /* gr16-gr31 */ | |
1043 | ||
1044 | retval |= __copy_from_user(&pt->r16, &ppr->gr[16], sizeof(long) * 16); | |
1045 | ||
1046 | /* b0 */ | |
1047 | ||
1048 | retval |= __get_user(pt->b0, &ppr->br[0]); | |
1049 | ||
1050 | /* b1-b5 */ | |
1051 | ||
1052 | for (i = 1; i < 6; i++) { | |
1053 | retval |= __get_user(val, &ppr->br[i]); | |
1054 | unw_set_br(&info, i, val); | |
1055 | } | |
1056 | ||
1057 | /* b6-b7 */ | |
1058 | ||
1059 | retval |= __get_user(pt->b6, &ppr->br[6]); | |
1060 | retval |= __get_user(pt->b7, &ppr->br[7]); | |
1061 | ||
1062 | /* fr2-fr5 */ | |
1063 | ||
1064 | for (i = 2; i < 6; i++) { | |
1065 | retval |= __copy_from_user(&fpval, &ppr->fr[i], sizeof(fpval)); | |
1066 | if (unw_set_fr(&info, i, fpval) < 0) | |
1067 | return -EIO; | |
1068 | } | |
1069 | ||
1070 | /* fr6-fr11 */ | |
1071 | ||
1072 | retval |= __copy_from_user(&pt->f6, &ppr->fr[6], | |
1073 | sizeof(ppr->fr[6]) * 6); | |
1074 | ||
1075 | /* fp scratch regs(12-15) */ | |
1076 | ||
1077 | retval |= __copy_from_user(&sw->f12, &ppr->fr[12], | |
1078 | sizeof(ppr->fr[12]) * 4); | |
1079 | ||
1080 | /* fr16-fr31 */ | |
1081 | ||
1082 | for (i = 16; i < 32; i++) { | |
1083 | retval |= __copy_from_user(&fpval, &ppr->fr[i], | |
1084 | sizeof(fpval)); | |
1085 | if (unw_set_fr(&info, i, fpval) < 0) | |
1086 | return -EIO; | |
1087 | } | |
1088 | ||
1089 | /* fph */ | |
1090 | ||
1091 | ia64_sync_fph(child); | |
1092 | retval |= __copy_from_user(&child->thread.fph, &ppr->fr[32], | |
1093 | sizeof(ppr->fr[32]) * 96); | |
1094 | ||
1095 | /* preds */ | |
1096 | ||
1097 | retval |= __get_user(pt->pr, &ppr->pr); | |
1098 | ||
1099 | /* nat bits */ | |
1100 | ||
1101 | retval |= __get_user(nat_bits, &ppr->nat); | |
1102 | ||
1103 | retval |= access_uarea(child, PT_CR_IPSR, &psr, 1); | |
4ea78729 | 1104 | retval |= access_uarea(child, PT_AR_RSC, &rsc, 1); |
1da177e4 LT |
1105 | retval |= access_uarea(child, PT_AR_EC, &ec, 1); |
1106 | retval |= access_uarea(child, PT_AR_LC, &lc, 1); | |
1107 | retval |= access_uarea(child, PT_AR_RNAT, &rnat, 1); | |
1108 | retval |= access_uarea(child, PT_AR_BSP, &bsp, 1); | |
1109 | retval |= access_uarea(child, PT_CFM, &cfm, 1); | |
1110 | retval |= access_uarea(child, PT_NAT_BITS, &nat_bits, 1); | |
1111 | ||
1112 | ret = retval ? -EIO : 0; | |
1113 | return ret; | |
1114 | } | |
1115 | ||
8db3f525 PT |
1116 | void |
1117 | user_enable_single_step (struct task_struct *child) | |
1118 | { | |
1119 | struct ia64_psr *child_psr = ia64_psr(task_pt_regs(child)); | |
1120 | ||
1121 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
1122 | child_psr->ss = 1; | |
1123 | } | |
1124 | ||
1125 | void | |
1126 | user_enable_block_step (struct task_struct *child) | |
1127 | { | |
1128 | struct ia64_psr *child_psr = ia64_psr(task_pt_regs(child)); | |
1129 | ||
1130 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
1131 | child_psr->tb = 1; | |
1132 | } | |
1133 | ||
1134 | void | |
1135 | user_disable_single_step (struct task_struct *child) | |
1136 | { | |
1137 | struct ia64_psr *child_psr = ia64_psr(task_pt_regs(child)); | |
1138 | ||
1139 | /* make sure the single step/taken-branch trap bits are not set: */ | |
1140 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
1141 | child_psr->ss = 0; | |
1142 | child_psr->tb = 0; | |
1143 | } | |
1144 | ||
1da177e4 LT |
1145 | /* |
1146 | * Called by kernel/ptrace.c when detaching.. | |
1147 | * | |
1148 | * Make sure the single step bit is not set. | |
1149 | */ | |
1150 | void | |
1151 | ptrace_disable (struct task_struct *child) | |
1152 | { | |
aa17f6f9 | 1153 | user_disable_single_step(child); |
1da177e4 LT |
1154 | } |
1155 | ||
eac738e6 | 1156 | long |
9b05a69e NK |
1157 | arch_ptrace (struct task_struct *child, long request, |
1158 | unsigned long addr, unsigned long data) | |
1da177e4 | 1159 | { |
1da177e4 | 1160 | switch (request) { |
aa17f6f9 PT |
1161 | case PTRACE_PEEKTEXT: |
1162 | case PTRACE_PEEKDATA: | |
1da177e4 | 1163 | /* read word at location addr */ |
84d77d3f | 1164 | if (ptrace_access_vm(child, addr, &data, sizeof(data), |
f307ab6d | 1165 | FOLL_FORCE) |
aa17f6f9 PT |
1166 | != sizeof(data)) |
1167 | return -EIO; | |
1168 | /* ensure return value is not mistaken for error code */ | |
972559a0 | 1169 | force_successful_syscall_return(); |
aa17f6f9 | 1170 | return data; |
1da177e4 | 1171 | |
972559a0 PT |
1172 | /* PTRACE_POKETEXT and PTRACE_POKEDATA is handled |
1173 | * by the generic ptrace_request(). | |
1174 | */ | |
1da177e4 | 1175 | |
aa17f6f9 | 1176 | case PTRACE_PEEKUSR: |
1da177e4 | 1177 | /* read the word at addr in the USER area */ |
aa17f6f9 PT |
1178 | if (access_uarea(child, addr, &data, 0) < 0) |
1179 | return -EIO; | |
1180 | /* ensure return value is not mistaken for error code */ | |
1da177e4 | 1181 | force_successful_syscall_return(); |
aa17f6f9 | 1182 | return data; |
1da177e4 | 1183 | |
aa17f6f9 | 1184 | case PTRACE_POKEUSR: |
1da177e4 | 1185 | /* write the word at addr in the USER area */ |
aa17f6f9 PT |
1186 | if (access_uarea(child, addr, &data, 1) < 0) |
1187 | return -EIO; | |
1188 | return 0; | |
1da177e4 | 1189 | |
aa17f6f9 | 1190 | case PTRACE_OLD_GETSIGINFO: |
1da177e4 | 1191 | /* for backwards-compatibility */ |
aa17f6f9 | 1192 | return ptrace_request(child, PTRACE_GETSIGINFO, addr, data); |
1da177e4 | 1193 | |
aa17f6f9 | 1194 | case PTRACE_OLD_SETSIGINFO: |
1da177e4 | 1195 | /* for backwards-compatibility */ |
aa17f6f9 PT |
1196 | return ptrace_request(child, PTRACE_SETSIGINFO, addr, data); |
1197 | ||
1198 | case PTRACE_GETREGS: | |
1199 | return ptrace_getregs(child, | |
1200 | (struct pt_all_user_regs __user *) data); | |
1201 | ||
1202 | case PTRACE_SETREGS: | |
1203 | return ptrace_setregs(child, | |
1204 | (struct pt_all_user_regs __user *) data); | |
1205 | ||
1206 | default: | |
1207 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 1208 | } |
1da177e4 LT |
1209 | } |
1210 | ||
1211 | ||
1da177e4 LT |
1212 | /* "asmlinkage" so the input arguments are preserved... */ |
1213 | ||
f14488cc | 1214 | asmlinkage long |
1da177e4 LT |
1215 | syscall_trace_enter (long arg0, long arg1, long arg2, long arg3, |
1216 | long arg4, long arg5, long arg6, long arg7, | |
1217 | struct pt_regs regs) | |
1218 | { | |
f14488cc SL |
1219 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
1220 | if (tracehook_report_syscall_entry(®s)) | |
1221 | return -ENOSYS; | |
1da177e4 | 1222 | |
3b2ce0b1 PT |
1223 | /* copy user rbs to kernel rbs */ |
1224 | if (test_thread_flag(TIF_RESTORE_RSE)) | |
1225 | ia64_sync_krbs(); | |
1226 | ||
2fd6f58b | 1227 | |
91397401 | 1228 | audit_syscall_entry(regs.r15, arg0, arg1, arg2, arg3); |
1da177e4 | 1229 | |
f14488cc | 1230 | return 0; |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | /* "asmlinkage" so the input arguments are preserved... */ | |
1234 | ||
1235 | asmlinkage void | |
1236 | syscall_trace_leave (long arg0, long arg1, long arg2, long arg3, | |
1237 | long arg4, long arg5, long arg6, long arg7, | |
1238 | struct pt_regs regs) | |
1239 | { | |
f14488cc SL |
1240 | int step; |
1241 | ||
d7e7528b | 1242 | audit_syscall_exit(®s); |
1da177e4 | 1243 | |
f14488cc SL |
1244 | step = test_thread_flag(TIF_SINGLESTEP); |
1245 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
1246 | tracehook_report_syscall_exit(®s, step); | |
3b2ce0b1 PT |
1247 | |
1248 | /* copy user rbs to kernel rbs */ | |
1249 | if (test_thread_flag(TIF_RESTORE_RSE)) | |
1250 | ia64_sync_krbs(); | |
1da177e4 | 1251 | } |
c70f8f68 SL |
1252 | |
1253 | /* Utrace implementation starts here */ | |
1254 | struct regset_get { | |
1255 | void *kbuf; | |
1256 | void __user *ubuf; | |
1257 | }; | |
1258 | ||
1259 | struct regset_set { | |
1260 | const void *kbuf; | |
1261 | const void __user *ubuf; | |
1262 | }; | |
1263 | ||
1264 | struct regset_getset { | |
1265 | struct task_struct *target; | |
1266 | const struct user_regset *regset; | |
1267 | union { | |
1268 | struct regset_get get; | |
1269 | struct regset_set set; | |
1270 | } u; | |
1271 | unsigned int pos; | |
1272 | unsigned int count; | |
1273 | int ret; | |
1274 | }; | |
1275 | ||
4c35bf3a AV |
1276 | static const ptrdiff_t pt_offsets[16] = |
1277 | { | |
1278 | #define R(n) offsetof(struct pt_regs, r##n) | |
1279 | [0] = -1, R(1), R(2), R(3), | |
1280 | [4] = -1, [5] = -1, [6] = -1, [7] = -1, | |
1281 | R(8), R(9), R(10), R(11), R(12), R(13), R(14), R(15), | |
1282 | #undef R | |
1283 | }; | |
1284 | ||
c70f8f68 SL |
1285 | static int |
1286 | access_elf_gpreg(struct task_struct *target, struct unw_frame_info *info, | |
1287 | unsigned long addr, unsigned long *data, int write_access) | |
1288 | { | |
4c35bf3a AV |
1289 | struct pt_regs *pt = task_pt_regs(target); |
1290 | unsigned reg = addr / sizeof(unsigned long); | |
1291 | ptrdiff_t d = pt_offsets[reg]; | |
1292 | ||
1293 | if (d >= 0) { | |
1294 | unsigned long *ptr = (void *)pt + d; | |
1295 | if (write_access) | |
1296 | *ptr = *data; | |
1297 | else | |
1298 | *data = *ptr; | |
1299 | return 0; | |
1300 | } else { | |
1301 | char nat = 0; | |
c70f8f68 SL |
1302 | if (write_access) { |
1303 | /* read NaT bit first: */ | |
1304 | unsigned long dummy; | |
4c35bf3a | 1305 | int ret = unw_get_gr(info, reg, &dummy, &nat); |
c70f8f68 SL |
1306 | if (ret < 0) |
1307 | return ret; | |
1308 | } | |
4c35bf3a | 1309 | return unw_access_gr(info, reg, data, &nat, write_access); |
c70f8f68 | 1310 | } |
c70f8f68 SL |
1311 | } |
1312 | ||
1313 | static int | |
1314 | access_elf_breg(struct task_struct *target, struct unw_frame_info *info, | |
1315 | unsigned long addr, unsigned long *data, int write_access) | |
1316 | { | |
1317 | struct pt_regs *pt; | |
1318 | unsigned long *ptr = NULL; | |
1319 | ||
1320 | pt = task_pt_regs(target); | |
1321 | switch (addr) { | |
1322 | case ELF_BR_OFFSET(0): | |
1323 | ptr = &pt->b0; | |
1324 | break; | |
1325 | case ELF_BR_OFFSET(1) ... ELF_BR_OFFSET(5): | |
1326 | return unw_access_br(info, (addr - ELF_BR_OFFSET(0))/8, | |
1327 | data, write_access); | |
1328 | case ELF_BR_OFFSET(6): | |
1329 | ptr = &pt->b6; | |
1330 | break; | |
1331 | case ELF_BR_OFFSET(7): | |
1332 | ptr = &pt->b7; | |
1333 | } | |
1334 | if (write_access) | |
1335 | *ptr = *data; | |
1336 | else | |
1337 | *data = *ptr; | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | static int | |
1342 | access_elf_areg(struct task_struct *target, struct unw_frame_info *info, | |
1343 | unsigned long addr, unsigned long *data, int write_access) | |
1344 | { | |
1345 | struct pt_regs *pt; | |
1346 | unsigned long cfm, urbs_end; | |
1347 | unsigned long *ptr = NULL; | |
1348 | ||
1349 | pt = task_pt_regs(target); | |
1350 | if (addr >= ELF_AR_RSC_OFFSET && addr <= ELF_AR_SSD_OFFSET) { | |
1351 | switch (addr) { | |
1352 | case ELF_AR_RSC_OFFSET: | |
1353 | /* force PL3 */ | |
1354 | if (write_access) | |
1355 | pt->ar_rsc = *data | (3 << 2); | |
1356 | else | |
1357 | *data = pt->ar_rsc; | |
1358 | return 0; | |
1359 | case ELF_AR_BSP_OFFSET: | |
1360 | /* | |
1361 | * By convention, we use PT_AR_BSP to refer to | |
1362 | * the end of the user-level backing store. | |
1363 | * Use ia64_rse_skip_regs(PT_AR_BSP, -CFM.sof) | |
1364 | * to get the real value of ar.bsp at the time | |
1365 | * the kernel was entered. | |
1366 | * | |
1367 | * Furthermore, when changing the contents of | |
1368 | * PT_AR_BSP (or PT_CFM) while the task is | |
1369 | * blocked in a system call, convert the state | |
1370 | * so that the non-system-call exit | |
1371 | * path is used. This ensures that the proper | |
1372 | * state will be picked up when resuming | |
1373 | * execution. However, it *also* means that | |
1374 | * once we write PT_AR_BSP/PT_CFM, it won't be | |
1375 | * possible to modify the syscall arguments of | |
1376 | * the pending system call any longer. This | |
1377 | * shouldn't be an issue because modifying | |
1378 | * PT_AR_BSP/PT_CFM generally implies that | |
1379 | * we're either abandoning the pending system | |
1380 | * call or that we defer it's re-execution | |
1381 | * (e.g., due to GDB doing an inferior | |
1382 | * function call). | |
1383 | */ | |
1384 | urbs_end = ia64_get_user_rbs_end(target, pt, &cfm); | |
1385 | if (write_access) { | |
1386 | if (*data != urbs_end) { | |
1387 | if (in_syscall(pt)) | |
1388 | convert_to_non_syscall(target, | |
1389 | pt, | |
1390 | cfm); | |
1391 | /* | |
1392 | * Simulate user-level write | |
1393 | * of ar.bsp: | |
1394 | */ | |
1395 | pt->loadrs = 0; | |
1396 | pt->ar_bspstore = *data; | |
1397 | } | |
1398 | } else | |
1399 | *data = urbs_end; | |
1400 | return 0; | |
1401 | case ELF_AR_BSPSTORE_OFFSET: | |
1402 | ptr = &pt->ar_bspstore; | |
1403 | break; | |
1404 | case ELF_AR_RNAT_OFFSET: | |
1405 | ptr = &pt->ar_rnat; | |
1406 | break; | |
1407 | case ELF_AR_CCV_OFFSET: | |
1408 | ptr = &pt->ar_ccv; | |
1409 | break; | |
1410 | case ELF_AR_UNAT_OFFSET: | |
1411 | ptr = &pt->ar_unat; | |
1412 | break; | |
1413 | case ELF_AR_FPSR_OFFSET: | |
1414 | ptr = &pt->ar_fpsr; | |
1415 | break; | |
1416 | case ELF_AR_PFS_OFFSET: | |
1417 | ptr = &pt->ar_pfs; | |
1418 | break; | |
1419 | case ELF_AR_LC_OFFSET: | |
1420 | return unw_access_ar(info, UNW_AR_LC, data, | |
1421 | write_access); | |
1422 | case ELF_AR_EC_OFFSET: | |
1423 | return unw_access_ar(info, UNW_AR_EC, data, | |
1424 | write_access); | |
1425 | case ELF_AR_CSD_OFFSET: | |
1426 | ptr = &pt->ar_csd; | |
1427 | break; | |
1428 | case ELF_AR_SSD_OFFSET: | |
1429 | ptr = &pt->ar_ssd; | |
1430 | } | |
1431 | } else if (addr >= ELF_CR_IIP_OFFSET && addr <= ELF_CR_IPSR_OFFSET) { | |
1432 | switch (addr) { | |
1433 | case ELF_CR_IIP_OFFSET: | |
1434 | ptr = &pt->cr_iip; | |
1435 | break; | |
1436 | case ELF_CFM_OFFSET: | |
1437 | urbs_end = ia64_get_user_rbs_end(target, pt, &cfm); | |
1438 | if (write_access) { | |
1439 | if (((cfm ^ *data) & PFM_MASK) != 0) { | |
1440 | if (in_syscall(pt)) | |
1441 | convert_to_non_syscall(target, | |
1442 | pt, | |
1443 | cfm); | |
1444 | pt->cr_ifs = ((pt->cr_ifs & ~PFM_MASK) | |
1445 | | (*data & PFM_MASK)); | |
1446 | } | |
1447 | } else | |
1448 | *data = cfm; | |
1449 | return 0; | |
1450 | case ELF_CR_IPSR_OFFSET: | |
1451 | if (write_access) { | |
1452 | unsigned long tmp = *data; | |
1453 | /* psr.ri==3 is a reserved value: SDM 2:25 */ | |
1454 | if ((tmp & IA64_PSR_RI) == IA64_PSR_RI) | |
1455 | tmp &= ~IA64_PSR_RI; | |
1456 | pt->cr_ipsr = ((tmp & IPSR_MASK) | |
1457 | | (pt->cr_ipsr & ~IPSR_MASK)); | |
1458 | } else | |
1459 | *data = (pt->cr_ipsr & IPSR_MASK); | |
1460 | return 0; | |
1461 | } | |
1462 | } else if (addr == ELF_NAT_OFFSET) | |
1463 | return access_nat_bits(target, pt, info, | |
1464 | data, write_access); | |
1465 | else if (addr == ELF_PR_OFFSET) | |
1466 | ptr = &pt->pr; | |
1467 | else | |
1468 | return -1; | |
1469 | ||
1470 | if (write_access) | |
1471 | *ptr = *data; | |
1472 | else | |
1473 | *data = *ptr; | |
1474 | ||
1475 | return 0; | |
1476 | } | |
1477 | ||
1478 | static int | |
1479 | access_elf_reg(struct task_struct *target, struct unw_frame_info *info, | |
1480 | unsigned long addr, unsigned long *data, int write_access) | |
1481 | { | |
1482 | if (addr >= ELF_GR_OFFSET(1) && addr <= ELF_GR_OFFSET(15)) | |
1483 | return access_elf_gpreg(target, info, addr, data, write_access); | |
1484 | else if (addr >= ELF_BR_OFFSET(0) && addr <= ELF_BR_OFFSET(7)) | |
1485 | return access_elf_breg(target, info, addr, data, write_access); | |
1486 | else | |
1487 | return access_elf_areg(target, info, addr, data, write_access); | |
1488 | } | |
1489 | ||
1490 | void do_gpregs_get(struct unw_frame_info *info, void *arg) | |
1491 | { | |
1492 | struct pt_regs *pt; | |
1493 | struct regset_getset *dst = arg; | |
1494 | elf_greg_t tmp[16]; | |
1495 | unsigned int i, index, min_copy; | |
1496 | ||
1497 | if (unw_unwind_to_user(info) < 0) | |
1498 | return; | |
1499 | ||
1500 | /* | |
1501 | * coredump format: | |
1502 | * r0-r31 | |
1503 | * NaT bits (for r0-r31; bit N == 1 iff rN is a NaT) | |
1504 | * predicate registers (p0-p63) | |
1505 | * b0-b7 | |
1506 | * ip cfm user-mask | |
1507 | * ar.rsc ar.bsp ar.bspstore ar.rnat | |
1508 | * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec | |
1509 | */ | |
1510 | ||
1511 | ||
1512 | /* Skip r0 */ | |
1513 | if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(1)) { | |
1514 | dst->ret = user_regset_copyout_zero(&dst->pos, &dst->count, | |
1515 | &dst->u.get.kbuf, | |
1516 | &dst->u.get.ubuf, | |
1517 | 0, ELF_GR_OFFSET(1)); | |
1518 | if (dst->ret || dst->count == 0) | |
1519 | return; | |
1520 | } | |
1521 | ||
1522 | /* gr1 - gr15 */ | |
1523 | if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(16)) { | |
1524 | index = (dst->pos - ELF_GR_OFFSET(1)) / sizeof(elf_greg_t); | |
1525 | min_copy = ELF_GR_OFFSET(16) > (dst->pos + dst->count) ? | |
1526 | (dst->pos + dst->count) : ELF_GR_OFFSET(16); | |
1527 | for (i = dst->pos; i < min_copy; i += sizeof(elf_greg_t), | |
1528 | index++) | |
1529 | if (access_elf_reg(dst->target, info, i, | |
1530 | &tmp[index], 0) < 0) { | |
1531 | dst->ret = -EIO; | |
1532 | return; | |
1533 | } | |
1534 | dst->ret = user_regset_copyout(&dst->pos, &dst->count, | |
1535 | &dst->u.get.kbuf, &dst->u.get.ubuf, tmp, | |
1536 | ELF_GR_OFFSET(1), ELF_GR_OFFSET(16)); | |
1537 | if (dst->ret || dst->count == 0) | |
1538 | return; | |
1539 | } | |
1540 | ||
1541 | /* r16-r31 */ | |
1542 | if (dst->count > 0 && dst->pos < ELF_NAT_OFFSET) { | |
1543 | pt = task_pt_regs(dst->target); | |
1544 | dst->ret = user_regset_copyout(&dst->pos, &dst->count, | |
1545 | &dst->u.get.kbuf, &dst->u.get.ubuf, &pt->r16, | |
1546 | ELF_GR_OFFSET(16), ELF_NAT_OFFSET); | |
1547 | if (dst->ret || dst->count == 0) | |
1548 | return; | |
1549 | } | |
1550 | ||
1551 | /* nat, pr, b0 - b7 */ | |
1552 | if (dst->count > 0 && dst->pos < ELF_CR_IIP_OFFSET) { | |
1553 | index = (dst->pos - ELF_NAT_OFFSET) / sizeof(elf_greg_t); | |
1554 | min_copy = ELF_CR_IIP_OFFSET > (dst->pos + dst->count) ? | |
1555 | (dst->pos + dst->count) : ELF_CR_IIP_OFFSET; | |
1556 | for (i = dst->pos; i < min_copy; i += sizeof(elf_greg_t), | |
1557 | index++) | |
1558 | if (access_elf_reg(dst->target, info, i, | |
1559 | &tmp[index], 0) < 0) { | |
1560 | dst->ret = -EIO; | |
1561 | return; | |
1562 | } | |
1563 | dst->ret = user_regset_copyout(&dst->pos, &dst->count, | |
1564 | &dst->u.get.kbuf, &dst->u.get.ubuf, tmp, | |
1565 | ELF_NAT_OFFSET, ELF_CR_IIP_OFFSET); | |
1566 | if (dst->ret || dst->count == 0) | |
1567 | return; | |
1568 | } | |
1569 | ||
1570 | /* ip cfm psr ar.rsc ar.bsp ar.bspstore ar.rnat | |
1571 | * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec ar.csd ar.ssd | |
1572 | */ | |
1573 | if (dst->count > 0 && dst->pos < (ELF_AR_END_OFFSET)) { | |
1574 | index = (dst->pos - ELF_CR_IIP_OFFSET) / sizeof(elf_greg_t); | |
1575 | min_copy = ELF_AR_END_OFFSET > (dst->pos + dst->count) ? | |
1576 | (dst->pos + dst->count) : ELF_AR_END_OFFSET; | |
1577 | for (i = dst->pos; i < min_copy; i += sizeof(elf_greg_t), | |
1578 | index++) | |
1579 | if (access_elf_reg(dst->target, info, i, | |
1580 | &tmp[index], 0) < 0) { | |
1581 | dst->ret = -EIO; | |
1582 | return; | |
1583 | } | |
1584 | dst->ret = user_regset_copyout(&dst->pos, &dst->count, | |
1585 | &dst->u.get.kbuf, &dst->u.get.ubuf, tmp, | |
1586 | ELF_CR_IIP_OFFSET, ELF_AR_END_OFFSET); | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | void do_gpregs_set(struct unw_frame_info *info, void *arg) | |
1591 | { | |
1592 | struct pt_regs *pt; | |
1593 | struct regset_getset *dst = arg; | |
1594 | elf_greg_t tmp[16]; | |
1595 | unsigned int i, index; | |
1596 | ||
1597 | if (unw_unwind_to_user(info) < 0) | |
1598 | return; | |
1599 | ||
1600 | /* Skip r0 */ | |
1601 | if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(1)) { | |
1602 | dst->ret = user_regset_copyin_ignore(&dst->pos, &dst->count, | |
1603 | &dst->u.set.kbuf, | |
1604 | &dst->u.set.ubuf, | |
1605 | 0, ELF_GR_OFFSET(1)); | |
1606 | if (dst->ret || dst->count == 0) | |
1607 | return; | |
1608 | } | |
1609 | ||
1610 | /* gr1-gr15 */ | |
1611 | if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(16)) { | |
1612 | i = dst->pos; | |
1613 | index = (dst->pos - ELF_GR_OFFSET(1)) / sizeof(elf_greg_t); | |
1614 | dst->ret = user_regset_copyin(&dst->pos, &dst->count, | |
1615 | &dst->u.set.kbuf, &dst->u.set.ubuf, tmp, | |
1616 | ELF_GR_OFFSET(1), ELF_GR_OFFSET(16)); | |
1617 | if (dst->ret) | |
1618 | return; | |
1619 | for ( ; i < dst->pos; i += sizeof(elf_greg_t), index++) | |
1620 | if (access_elf_reg(dst->target, info, i, | |
1621 | &tmp[index], 1) < 0) { | |
1622 | dst->ret = -EIO; | |
1623 | return; | |
1624 | } | |
1625 | if (dst->count == 0) | |
1626 | return; | |
1627 | } | |
1628 | ||
1629 | /* gr16-gr31 */ | |
1630 | if (dst->count > 0 && dst->pos < ELF_NAT_OFFSET) { | |
1631 | pt = task_pt_regs(dst->target); | |
1632 | dst->ret = user_regset_copyin(&dst->pos, &dst->count, | |
1633 | &dst->u.set.kbuf, &dst->u.set.ubuf, &pt->r16, | |
1634 | ELF_GR_OFFSET(16), ELF_NAT_OFFSET); | |
1635 | if (dst->ret || dst->count == 0) | |
1636 | return; | |
1637 | } | |
1638 | ||
1639 | /* nat, pr, b0 - b7 */ | |
1640 | if (dst->count > 0 && dst->pos < ELF_CR_IIP_OFFSET) { | |
1641 | i = dst->pos; | |
1642 | index = (dst->pos - ELF_NAT_OFFSET) / sizeof(elf_greg_t); | |
1643 | dst->ret = user_regset_copyin(&dst->pos, &dst->count, | |
1644 | &dst->u.set.kbuf, &dst->u.set.ubuf, tmp, | |
1645 | ELF_NAT_OFFSET, ELF_CR_IIP_OFFSET); | |
1646 | if (dst->ret) | |
1647 | return; | |
1648 | for (; i < dst->pos; i += sizeof(elf_greg_t), index++) | |
1649 | if (access_elf_reg(dst->target, info, i, | |
1650 | &tmp[index], 1) < 0) { | |
1651 | dst->ret = -EIO; | |
1652 | return; | |
1653 | } | |
1654 | if (dst->count == 0) | |
1655 | return; | |
1656 | } | |
1657 | ||
1658 | /* ip cfm psr ar.rsc ar.bsp ar.bspstore ar.rnat | |
1659 | * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec ar.csd ar.ssd | |
1660 | */ | |
1661 | if (dst->count > 0 && dst->pos < (ELF_AR_END_OFFSET)) { | |
1662 | i = dst->pos; | |
1663 | index = (dst->pos - ELF_CR_IIP_OFFSET) / sizeof(elf_greg_t); | |
1664 | dst->ret = user_regset_copyin(&dst->pos, &dst->count, | |
1665 | &dst->u.set.kbuf, &dst->u.set.ubuf, tmp, | |
1666 | ELF_CR_IIP_OFFSET, ELF_AR_END_OFFSET); | |
1667 | if (dst->ret) | |
1668 | return; | |
1669 | for ( ; i < dst->pos; i += sizeof(elf_greg_t), index++) | |
1670 | if (access_elf_reg(dst->target, info, i, | |
1671 | &tmp[index], 1) < 0) { | |
1672 | dst->ret = -EIO; | |
1673 | return; | |
1674 | } | |
1675 | } | |
1676 | } | |
1677 | ||
1678 | #define ELF_FP_OFFSET(i) (i * sizeof(elf_fpreg_t)) | |
1679 | ||
1680 | void do_fpregs_get(struct unw_frame_info *info, void *arg) | |
1681 | { | |
1682 | struct regset_getset *dst = arg; | |
1683 | struct task_struct *task = dst->target; | |
1684 | elf_fpreg_t tmp[30]; | |
1685 | int index, min_copy, i; | |
1686 | ||
1687 | if (unw_unwind_to_user(info) < 0) | |
1688 | return; | |
1689 | ||
1690 | /* Skip pos 0 and 1 */ | |
1691 | if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(2)) { | |
1692 | dst->ret = user_regset_copyout_zero(&dst->pos, &dst->count, | |
1693 | &dst->u.get.kbuf, | |
1694 | &dst->u.get.ubuf, | |
1695 | 0, ELF_FP_OFFSET(2)); | |
1696 | if (dst->count == 0 || dst->ret) | |
1697 | return; | |
1698 | } | |
1699 | ||
1700 | /* fr2-fr31 */ | |
1701 | if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(32)) { | |
1702 | index = (dst->pos - ELF_FP_OFFSET(2)) / sizeof(elf_fpreg_t); | |
1703 | ||
1704 | min_copy = min(((unsigned int)ELF_FP_OFFSET(32)), | |
1705 | dst->pos + dst->count); | |
1706 | for (i = dst->pos; i < min_copy; i += sizeof(elf_fpreg_t), | |
1707 | index++) | |
1708 | if (unw_get_fr(info, i / sizeof(elf_fpreg_t), | |
1709 | &tmp[index])) { | |
1710 | dst->ret = -EIO; | |
1711 | return; | |
1712 | } | |
1713 | dst->ret = user_regset_copyout(&dst->pos, &dst->count, | |
1714 | &dst->u.get.kbuf, &dst->u.get.ubuf, tmp, | |
1715 | ELF_FP_OFFSET(2), ELF_FP_OFFSET(32)); | |
1716 | if (dst->count == 0 || dst->ret) | |
1717 | return; | |
1718 | } | |
1719 | ||
1720 | /* fph */ | |
1721 | if (dst->count > 0) { | |
1722 | ia64_flush_fph(dst->target); | |
1723 | if (task->thread.flags & IA64_THREAD_FPH_VALID) | |
1724 | dst->ret = user_regset_copyout( | |
1725 | &dst->pos, &dst->count, | |
1726 | &dst->u.get.kbuf, &dst->u.get.ubuf, | |
1727 | &dst->target->thread.fph, | |
1728 | ELF_FP_OFFSET(32), -1); | |
1729 | else | |
1730 | /* Zero fill instead. */ | |
1731 | dst->ret = user_regset_copyout_zero( | |
1732 | &dst->pos, &dst->count, | |
1733 | &dst->u.get.kbuf, &dst->u.get.ubuf, | |
1734 | ELF_FP_OFFSET(32), -1); | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | void do_fpregs_set(struct unw_frame_info *info, void *arg) | |
1739 | { | |
1740 | struct regset_getset *dst = arg; | |
1741 | elf_fpreg_t fpreg, tmp[30]; | |
1742 | int index, start, end; | |
1743 | ||
1744 | if (unw_unwind_to_user(info) < 0) | |
1745 | return; | |
1746 | ||
1747 | /* Skip pos 0 and 1 */ | |
1748 | if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(2)) { | |
1749 | dst->ret = user_regset_copyin_ignore(&dst->pos, &dst->count, | |
1750 | &dst->u.set.kbuf, | |
1751 | &dst->u.set.ubuf, | |
1752 | 0, ELF_FP_OFFSET(2)); | |
1753 | if (dst->count == 0 || dst->ret) | |
1754 | return; | |
1755 | } | |
1756 | ||
1757 | /* fr2-fr31 */ | |
1758 | if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(32)) { | |
1759 | start = dst->pos; | |
1760 | end = min(((unsigned int)ELF_FP_OFFSET(32)), | |
1761 | dst->pos + dst->count); | |
1762 | dst->ret = user_regset_copyin(&dst->pos, &dst->count, | |
1763 | &dst->u.set.kbuf, &dst->u.set.ubuf, tmp, | |
1764 | ELF_FP_OFFSET(2), ELF_FP_OFFSET(32)); | |
1765 | if (dst->ret) | |
1766 | return; | |
1767 | ||
1768 | if (start & 0xF) { /* only write high part */ | |
1769 | if (unw_get_fr(info, start / sizeof(elf_fpreg_t), | |
1770 | &fpreg)) { | |
1771 | dst->ret = -EIO; | |
1772 | return; | |
1773 | } | |
1774 | tmp[start / sizeof(elf_fpreg_t) - 2].u.bits[0] | |
1775 | = fpreg.u.bits[0]; | |
1776 | start &= ~0xFUL; | |
1777 | } | |
1778 | if (end & 0xF) { /* only write low part */ | |
1779 | if (unw_get_fr(info, end / sizeof(elf_fpreg_t), | |
1780 | &fpreg)) { | |
1781 | dst->ret = -EIO; | |
1782 | return; | |
1783 | } | |
1784 | tmp[end / sizeof(elf_fpreg_t) - 2].u.bits[1] | |
1785 | = fpreg.u.bits[1]; | |
1786 | end = (end + 0xF) & ~0xFUL; | |
1787 | } | |
1788 | ||
1789 | for ( ; start < end ; start += sizeof(elf_fpreg_t)) { | |
1790 | index = start / sizeof(elf_fpreg_t); | |
1791 | if (unw_set_fr(info, index, tmp[index - 2])) { | |
1792 | dst->ret = -EIO; | |
1793 | return; | |
1794 | } | |
1795 | } | |
1796 | if (dst->ret || dst->count == 0) | |
1797 | return; | |
1798 | } | |
1799 | ||
1800 | /* fph */ | |
1801 | if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(128)) { | |
1802 | ia64_sync_fph(dst->target); | |
1803 | dst->ret = user_regset_copyin(&dst->pos, &dst->count, | |
1804 | &dst->u.set.kbuf, | |
1805 | &dst->u.set.ubuf, | |
1806 | &dst->target->thread.fph, | |
1807 | ELF_FP_OFFSET(32), -1); | |
1808 | } | |
1809 | } | |
1810 | ||
1811 | static int | |
1812 | do_regset_call(void (*call)(struct unw_frame_info *, void *), | |
1813 | struct task_struct *target, | |
1814 | const struct user_regset *regset, | |
1815 | unsigned int pos, unsigned int count, | |
1816 | const void *kbuf, const void __user *ubuf) | |
1817 | { | |
1818 | struct regset_getset info = { .target = target, .regset = regset, | |
1819 | .pos = pos, .count = count, | |
1820 | .u.set = { .kbuf = kbuf, .ubuf = ubuf }, | |
1821 | .ret = 0 }; | |
1822 | ||
1823 | if (target == current) | |
1824 | unw_init_running(call, &info); | |
1825 | else { | |
1826 | struct unw_frame_info ufi; | |
1827 | memset(&ufi, 0, sizeof(ufi)); | |
1828 | unw_init_from_blocked_task(&ufi, target); | |
1829 | (*call)(&ufi, &info); | |
1830 | } | |
1831 | ||
1832 | return info.ret; | |
1833 | } | |
1834 | ||
1835 | static int | |
1836 | gpregs_get(struct task_struct *target, | |
1837 | const struct user_regset *regset, | |
1838 | unsigned int pos, unsigned int count, | |
1839 | void *kbuf, void __user *ubuf) | |
1840 | { | |
1841 | return do_regset_call(do_gpregs_get, target, regset, pos, count, | |
1842 | kbuf, ubuf); | |
1843 | } | |
1844 | ||
1845 | static int gpregs_set(struct task_struct *target, | |
1846 | const struct user_regset *regset, | |
1847 | unsigned int pos, unsigned int count, | |
1848 | const void *kbuf, const void __user *ubuf) | |
1849 | { | |
1850 | return do_regset_call(do_gpregs_set, target, regset, pos, count, | |
1851 | kbuf, ubuf); | |
1852 | } | |
1853 | ||
1854 | static void do_gpregs_writeback(struct unw_frame_info *info, void *arg) | |
1855 | { | |
1856 | do_sync_rbs(info, ia64_sync_user_rbs); | |
1857 | } | |
1858 | ||
1859 | /* | |
1860 | * This is called to write back the register backing store. | |
1861 | * ptrace does this before it stops, so that a tracer reading the user | |
1862 | * memory after the thread stops will get the current register data. | |
1863 | */ | |
1864 | static int | |
1865 | gpregs_writeback(struct task_struct *target, | |
1866 | const struct user_regset *regset, | |
1867 | int now) | |
1868 | { | |
1869 | if (test_and_set_tsk_thread_flag(target, TIF_RESTORE_RSE)) | |
1870 | return 0; | |
f14488cc | 1871 | set_notify_resume(target); |
c70f8f68 SL |
1872 | return do_regset_call(do_gpregs_writeback, target, regset, 0, 0, |
1873 | NULL, NULL); | |
1874 | } | |
1875 | ||
1876 | static int | |
1877 | fpregs_active(struct task_struct *target, const struct user_regset *regset) | |
1878 | { | |
1879 | return (target->thread.flags & IA64_THREAD_FPH_VALID) ? 128 : 32; | |
1880 | } | |
1881 | ||
1882 | static int fpregs_get(struct task_struct *target, | |
1883 | const struct user_regset *regset, | |
1884 | unsigned int pos, unsigned int count, | |
1885 | void *kbuf, void __user *ubuf) | |
1886 | { | |
1887 | return do_regset_call(do_fpregs_get, target, regset, pos, count, | |
1888 | kbuf, ubuf); | |
1889 | } | |
1890 | ||
1891 | static int fpregs_set(struct task_struct *target, | |
1892 | const struct user_regset *regset, | |
1893 | unsigned int pos, unsigned int count, | |
1894 | const void *kbuf, const void __user *ubuf) | |
1895 | { | |
1896 | return do_regset_call(do_fpregs_set, target, regset, pos, count, | |
1897 | kbuf, ubuf); | |
1898 | } | |
1899 | ||
4cd8dc83 SL |
1900 | static int |
1901 | access_uarea(struct task_struct *child, unsigned long addr, | |
1902 | unsigned long *data, int write_access) | |
1903 | { | |
1904 | unsigned int pos = -1; /* an invalid value */ | |
1905 | int ret; | |
1906 | unsigned long *ptr, regnum; | |
1907 | ||
1908 | if ((addr & 0x7) != 0) { | |
1909 | dprintk("ptrace: unaligned register address 0x%lx\n", addr); | |
1910 | return -1; | |
1911 | } | |
1912 | if ((addr >= PT_NAT_BITS + 8 && addr < PT_F2) || | |
1913 | (addr >= PT_R7 + 8 && addr < PT_B1) || | |
1914 | (addr >= PT_AR_LC + 8 && addr < PT_CR_IPSR) || | |
1915 | (addr >= PT_AR_SSD + 8 && addr < PT_DBR)) { | |
1916 | dprintk("ptrace: rejecting access to register " | |
1917 | "address 0x%lx\n", addr); | |
1918 | return -1; | |
1919 | } | |
1920 | ||
1921 | switch (addr) { | |
1922 | case PT_F32 ... (PT_F127 + 15): | |
1923 | pos = addr - PT_F32 + ELF_FP_OFFSET(32); | |
1924 | break; | |
1925 | case PT_F2 ... (PT_F5 + 15): | |
1926 | pos = addr - PT_F2 + ELF_FP_OFFSET(2); | |
1927 | break; | |
1928 | case PT_F10 ... (PT_F31 + 15): | |
1929 | pos = addr - PT_F10 + ELF_FP_OFFSET(10); | |
1930 | break; | |
1931 | case PT_F6 ... (PT_F9 + 15): | |
1932 | pos = addr - PT_F6 + ELF_FP_OFFSET(6); | |
1933 | break; | |
1934 | } | |
1935 | ||
1936 | if (pos != -1) { | |
1937 | if (write_access) | |
1938 | ret = fpregs_set(child, NULL, pos, | |
1939 | sizeof(unsigned long), data, NULL); | |
1940 | else | |
1941 | ret = fpregs_get(child, NULL, pos, | |
1942 | sizeof(unsigned long), data, NULL); | |
1943 | if (ret != 0) | |
1944 | return -1; | |
1945 | return 0; | |
1946 | } | |
1947 | ||
1948 | switch (addr) { | |
1949 | case PT_NAT_BITS: | |
1950 | pos = ELF_NAT_OFFSET; | |
1951 | break; | |
1952 | case PT_R4 ... PT_R7: | |
1953 | pos = addr - PT_R4 + ELF_GR_OFFSET(4); | |
1954 | break; | |
1955 | case PT_B1 ... PT_B5: | |
1956 | pos = addr - PT_B1 + ELF_BR_OFFSET(1); | |
1957 | break; | |
1958 | case PT_AR_EC: | |
1959 | pos = ELF_AR_EC_OFFSET; | |
1960 | break; | |
1961 | case PT_AR_LC: | |
1962 | pos = ELF_AR_LC_OFFSET; | |
1963 | break; | |
1964 | case PT_CR_IPSR: | |
1965 | pos = ELF_CR_IPSR_OFFSET; | |
1966 | break; | |
1967 | case PT_CR_IIP: | |
1968 | pos = ELF_CR_IIP_OFFSET; | |
1969 | break; | |
1970 | case PT_CFM: | |
1971 | pos = ELF_CFM_OFFSET; | |
1972 | break; | |
1973 | case PT_AR_UNAT: | |
1974 | pos = ELF_AR_UNAT_OFFSET; | |
1975 | break; | |
1976 | case PT_AR_PFS: | |
1977 | pos = ELF_AR_PFS_OFFSET; | |
1978 | break; | |
1979 | case PT_AR_RSC: | |
1980 | pos = ELF_AR_RSC_OFFSET; | |
1981 | break; | |
1982 | case PT_AR_RNAT: | |
1983 | pos = ELF_AR_RNAT_OFFSET; | |
1984 | break; | |
1985 | case PT_AR_BSPSTORE: | |
1986 | pos = ELF_AR_BSPSTORE_OFFSET; | |
1987 | break; | |
1988 | case PT_PR: | |
1989 | pos = ELF_PR_OFFSET; | |
1990 | break; | |
1991 | case PT_B6: | |
1992 | pos = ELF_BR_OFFSET(6); | |
1993 | break; | |
1994 | case PT_AR_BSP: | |
1995 | pos = ELF_AR_BSP_OFFSET; | |
1996 | break; | |
1997 | case PT_R1 ... PT_R3: | |
1998 | pos = addr - PT_R1 + ELF_GR_OFFSET(1); | |
1999 | break; | |
2000 | case PT_R12 ... PT_R15: | |
2001 | pos = addr - PT_R12 + ELF_GR_OFFSET(12); | |
2002 | break; | |
2003 | case PT_R8 ... PT_R11: | |
2004 | pos = addr - PT_R8 + ELF_GR_OFFSET(8); | |
2005 | break; | |
2006 | case PT_R16 ... PT_R31: | |
2007 | pos = addr - PT_R16 + ELF_GR_OFFSET(16); | |
2008 | break; | |
2009 | case PT_AR_CCV: | |
2010 | pos = ELF_AR_CCV_OFFSET; | |
2011 | break; | |
2012 | case PT_AR_FPSR: | |
2013 | pos = ELF_AR_FPSR_OFFSET; | |
2014 | break; | |
2015 | case PT_B0: | |
2016 | pos = ELF_BR_OFFSET(0); | |
2017 | break; | |
2018 | case PT_B7: | |
2019 | pos = ELF_BR_OFFSET(7); | |
2020 | break; | |
2021 | case PT_AR_CSD: | |
2022 | pos = ELF_AR_CSD_OFFSET; | |
2023 | break; | |
2024 | case PT_AR_SSD: | |
2025 | pos = ELF_AR_SSD_OFFSET; | |
2026 | break; | |
2027 | } | |
2028 | ||
2029 | if (pos != -1) { | |
2030 | if (write_access) | |
2031 | ret = gpregs_set(child, NULL, pos, | |
2032 | sizeof(unsigned long), data, NULL); | |
2033 | else | |
2034 | ret = gpregs_get(child, NULL, pos, | |
2035 | sizeof(unsigned long), data, NULL); | |
2036 | if (ret != 0) | |
2037 | return -1; | |
2038 | return 0; | |
2039 | } | |
2040 | ||
2041 | /* access debug registers */ | |
2042 | if (addr >= PT_IBR) { | |
2043 | regnum = (addr - PT_IBR) >> 3; | |
2044 | ptr = &child->thread.ibr[0]; | |
2045 | } else { | |
2046 | regnum = (addr - PT_DBR) >> 3; | |
2047 | ptr = &child->thread.dbr[0]; | |
2048 | } | |
2049 | ||
2050 | if (regnum >= 8) { | |
2051 | dprintk("ptrace: rejecting access to register " | |
2052 | "address 0x%lx\n", addr); | |
2053 | return -1; | |
2054 | } | |
2055 | #ifdef CONFIG_PERFMON | |
2056 | /* | |
2057 | * Check if debug registers are used by perfmon. This | |
2058 | * test must be done once we know that we can do the | |
2059 | * operation, i.e. the arguments are all valid, but | |
2060 | * before we start modifying the state. | |
2061 | * | |
2062 | * Perfmon needs to keep a count of how many processes | |
2063 | * are trying to modify the debug registers for system | |
2064 | * wide monitoring sessions. | |
2065 | * | |
2066 | * We also include read access here, because they may | |
2067 | * cause the PMU-installed debug register state | |
2068 | * (dbr[], ibr[]) to be reset. The two arrays are also | |
2069 | * used by perfmon, but we do not use | |
2070 | * IA64_THREAD_DBG_VALID. The registers are restored | |
2071 | * by the PMU context switch code. | |
2072 | */ | |
2073 | if (pfm_use_debug_registers(child)) | |
2074 | return -1; | |
2075 | #endif | |
2076 | ||
2077 | if (!(child->thread.flags & IA64_THREAD_DBG_VALID)) { | |
2078 | child->thread.flags |= IA64_THREAD_DBG_VALID; | |
2079 | memset(child->thread.dbr, 0, | |
2080 | sizeof(child->thread.dbr)); | |
2081 | memset(child->thread.ibr, 0, | |
2082 | sizeof(child->thread.ibr)); | |
2083 | } | |
2084 | ||
2085 | ptr += regnum; | |
2086 | ||
2087 | if ((regnum & 1) && write_access) { | |
2088 | /* don't let the user set kernel-level breakpoints: */ | |
2089 | *ptr = *data & ~(7UL << 56); | |
2090 | return 0; | |
2091 | } | |
2092 | if (write_access) | |
2093 | *ptr = *data; | |
2094 | else | |
2095 | *data = *ptr; | |
2096 | return 0; | |
2097 | } | |
2098 | ||
c70f8f68 SL |
2099 | static const struct user_regset native_regsets[] = { |
2100 | { | |
2101 | .core_note_type = NT_PRSTATUS, | |
2102 | .n = ELF_NGREG, | |
2103 | .size = sizeof(elf_greg_t), .align = sizeof(elf_greg_t), | |
2104 | .get = gpregs_get, .set = gpregs_set, | |
2105 | .writeback = gpregs_writeback | |
2106 | }, | |
2107 | { | |
2108 | .core_note_type = NT_PRFPREG, | |
2109 | .n = ELF_NFPREG, | |
2110 | .size = sizeof(elf_fpreg_t), .align = sizeof(elf_fpreg_t), | |
2111 | .get = fpregs_get, .set = fpregs_set, .active = fpregs_active | |
2112 | }, | |
2113 | }; | |
2114 | ||
2115 | static const struct user_regset_view user_ia64_view = { | |
2116 | .name = "ia64", | |
2117 | .e_machine = EM_IA_64, | |
2118 | .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) | |
2119 | }; | |
2120 | ||
2121 | const struct user_regset_view *task_user_regset_view(struct task_struct *tsk) | |
2122 | { | |
2123 | return &user_ia64_view; | |
2124 | } | |
cfb361f1 SL |
2125 | |
2126 | struct syscall_get_set_args { | |
2127 | unsigned int i; | |
2128 | unsigned int n; | |
2129 | unsigned long *args; | |
2130 | struct pt_regs *regs; | |
2131 | int rw; | |
2132 | }; | |
2133 | ||
2134 | static void syscall_get_set_args_cb(struct unw_frame_info *info, void *data) | |
2135 | { | |
2136 | struct syscall_get_set_args *args = data; | |
2137 | struct pt_regs *pt = args->regs; | |
2138 | unsigned long *krbs, cfm, ndirty; | |
2139 | int i, count; | |
2140 | ||
2141 | if (unw_unwind_to_user(info) < 0) | |
2142 | return; | |
2143 | ||
2144 | cfm = pt->cr_ifs; | |
2145 | krbs = (unsigned long *)info->task + IA64_RBS_OFFSET/8; | |
2146 | ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19)); | |
2147 | ||
2148 | count = 0; | |
2149 | if (in_syscall(pt)) | |
2150 | count = min_t(int, args->n, cfm & 0x7f); | |
2151 | ||
2152 | for (i = 0; i < count; i++) { | |
2153 | if (args->rw) | |
2154 | *ia64_rse_skip_regs(krbs, ndirty + i + args->i) = | |
2155 | args->args[i]; | |
2156 | else | |
2157 | args->args[i] = *ia64_rse_skip_regs(krbs, | |
2158 | ndirty + i + args->i); | |
2159 | } | |
2160 | ||
2161 | if (!args->rw) { | |
2162 | while (i < args->n) { | |
2163 | args->args[i] = 0; | |
2164 | i++; | |
2165 | } | |
2166 | } | |
2167 | } | |
2168 | ||
2169 | void ia64_syscall_get_set_arguments(struct task_struct *task, | |
32d92586 | 2170 | struct pt_regs *regs, unsigned long *args, int rw) |
cfb361f1 SL |
2171 | { |
2172 | struct syscall_get_set_args data = { | |
32d92586 SRV |
2173 | .i = 0, |
2174 | .n = 6, | |
cfb361f1 SL |
2175 | .args = args, |
2176 | .regs = regs, | |
2177 | .rw = rw, | |
2178 | }; | |
2179 | ||
2180 | if (task == current) | |
2181 | unw_init_running(syscall_get_set_args_cb, &data); | |
2182 | else { | |
2183 | struct unw_frame_info ufi; | |
2184 | memset(&ufi, 0, sizeof(ufi)); | |
2185 | unw_init_from_blocked_task(&ufi, task); | |
2186 | syscall_get_set_args_cb(&ufi, &data); | |
2187 | } | |
2188 | } |