1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* ptrace.c: Sparc process tracing support. |
3 | * |
4 | * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net) |
5 | * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
6 | * |
7 | * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson, |
8 | * and David Mosberger. |
9 | * |
10 | * Added Linux support -miguel (weird, eh?, the original code was meant |
11 | * to emulate SunOS). |
12 | */ |
13 | |
14 | #include <linux/kernel.h> |
15 | #include <linux/sched.h> |
16 | #include <linux/sched/task_stack.h> |
17 | #include <linux/mm.h> |
18 | #include <linux/errno.h> |
19 | #include <linux/export.h> |
20 | #include <linux/ptrace.h> |
21 | #include <linux/user.h> |
22 | #include <linux/smp.h> |
23 | #include <linux/security.h> |
24 | #include <linux/seccomp.h> |
25 | #include <linux/audit.h> |
26 | #include <linux/signal.h> |
27 | #include <linux/regset.h> |
28 | #include <trace/syscall.h> |
29 | #include <linux/compat.h> |
30 | #include <linux/elf.h> |
31 | #include <linux/context_tracking.h> |
32 | |
33 | #include <asm/asi.h> |
34 | #include <linux/uaccess.h> |
35 | #include <asm/psrcompat.h> |
36 | #include <asm/visasm.h> |
37 | #include <asm/spitfire.h> |
38 | #include <asm/page.h> |
39 | #include <asm/cpudata.h> |
40 | #include <asm/cacheflush.h> |
41 | |
42 | #define CREATE_TRACE_POINTS |
43 | #include <trace/events/syscalls.h> |
44 | |
45 | #include "entry.h" |
46 | |
47 | /* #define ALLOW_INIT_TRACING */ |
48 | |
49 | struct pt_regs_offset { |
50 | const char *name; |
51 | int offset; |
52 | }; |
53 | |
54 | #define REG_OFFSET_NAME(n, r) \ |
55 | {.name = n, .offset = (PT_V9_##r)} |
56 | #define REG_OFFSET_END {.name = NULL, .offset = 0} |
57 | |
58 | static const struct pt_regs_offset regoffset_table[] = { |
59 | REG_OFFSET_NAME("g0" , G0), |
60 | REG_OFFSET_NAME("g1" , G1), |
61 | REG_OFFSET_NAME("g2" , G2), |
62 | REG_OFFSET_NAME("g3" , G3), |
63 | REG_OFFSET_NAME("g4" , G4), |
64 | REG_OFFSET_NAME("g5" , G5), |
65 | REG_OFFSET_NAME("g6" , G6), |
66 | REG_OFFSET_NAME("g7" , G7), |
67 | |
68 | REG_OFFSET_NAME("i0" , I0), |
69 | REG_OFFSET_NAME("i1" , I1), |
70 | REG_OFFSET_NAME("i2" , I2), |
71 | REG_OFFSET_NAME("i3" , I3), |
72 | REG_OFFSET_NAME("i4" , I4), |
73 | REG_OFFSET_NAME("i5" , I5), |
74 | REG_OFFSET_NAME("i6" , I6), |
75 | REG_OFFSET_NAME("i7" , I7), |
76 | |
77 | REG_OFFSET_NAME("tstate" , TSTATE), |
78 | REG_OFFSET_NAME("pc" , TPC), |
79 | REG_OFFSET_NAME("npc" , TNPC), |
80 | REG_OFFSET_NAME("y" , Y), |
81 | REG_OFFSET_NAME("lr" , I7), |
82 | |
83 | REG_OFFSET_END, |
84 | }; |
85 | |
86 | /* |
87 | * Called by kernel/ptrace.c when detaching.. |
88 | * |
89 | * Make sure single step bits etc are not set. |
90 | */ |
91 | void ptrace_disable(struct task_struct *child) |
92 | { |
93 | /* nothing to do */ |
94 | } |
95 | |
96 | /* To get the necessary page struct, access_process_vm() first calls |
97 | * get_user_pages(). This has done a flush_dcache_page() on the |
98 | * accessed page. Then our caller (copy_{to,from}_user_page()) did |
99 | * to memcpy to read/write the data from that page. |
100 | * |
101 | * Now, the only thing we have to do is: |
102 | * 1) flush the D-cache if it's possible than an illegal alias |
103 | * has been created |
104 | * 2) flush the I-cache if this is pre-cheetah and we did a write |
105 | */ |
106 | void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, |
107 | unsigned long uaddr, void *kaddr, |
108 | unsigned long len, int write) |
109 | { |
110 | BUG_ON(len > PAGE_SIZE); |
111 | |
112 | if (tlb_type == hypervisor) |
113 | return; |
114 | |
115 | preempt_disable(); |
116 | |
117 | #ifdef DCACHE_ALIASING_POSSIBLE |
118 | /* If bit 13 of the kernel address we used to access the |
119 | * user page is the same as the virtual address that page |
120 | * is mapped to in the user's address space, we can skip the |
121 | * D-cache flush. |
122 | */ |
123 | if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) { |
124 | unsigned long start = __pa(kaddr); |
125 | unsigned long end = start + len; |
126 | unsigned long dcache_line_size; |
127 | |
128 | dcache_line_size = local_cpu_data().dcache_line_size; |
129 | |
130 | if (tlb_type == spitfire) { |
131 | for (; start < end; start += dcache_line_size) |
132 | spitfire_put_dcache_tag(start & 0x3fe0, 0x0); |
133 | } else { |
134 | start &= ~(dcache_line_size - 1); |
135 | for (; start < end; start += dcache_line_size) |
136 | __asm__ __volatile__( |
137 | "stxa %%g0, [%0] %1\n\t" |
138 | "membar #Sync" |
139 | : /* no outputs */ |
140 | : "r" (start), |
141 | "i" (ASI_DCACHE_INVALIDATE)); |
142 | } |
143 | } |
144 | #endif |
145 | if (write && tlb_type == spitfire) { |
146 | unsigned long start = (unsigned long) kaddr; |
147 | unsigned long end = start + len; |
148 | unsigned long icache_line_size; |
149 | |
150 | icache_line_size = local_cpu_data().icache_line_size; |
151 | |
152 | for (; start < end; start += icache_line_size) |
153 | flushi(start); |
154 | } |
155 | |
156 | preempt_enable(); |
157 | } |
158 | EXPORT_SYMBOL_GPL(flush_ptrace_access); |
159 | |
160 | static int get_from_target(struct task_struct *target, unsigned long uaddr, |
161 | void *kbuf, int len) |
162 | { |
163 | if (target == current) { |
164 | if (copy_from_user(to: kbuf, from: (void __user *) uaddr, n: len)) |
165 | return -EFAULT; |
166 | } else { |
167 | int len2 = access_process_vm(tsk: target, addr: uaddr, buf: kbuf, len, |
168 | gup_flags: FOLL_FORCE); |
169 | if (len2 != len) |
170 | return -EFAULT; |
171 | } |
172 | return 0; |
173 | } |
174 | |
175 | static int set_to_target(struct task_struct *target, unsigned long uaddr, |
176 | void *kbuf, int len) |
177 | { |
178 | if (target == current) { |
179 | if (copy_to_user(to: (void __user *) uaddr, from: kbuf, n: len)) |
180 | return -EFAULT; |
181 | } else { |
182 | int len2 = access_process_vm(tsk: target, addr: uaddr, buf: kbuf, len, |
183 | gup_flags: FOLL_FORCE | FOLL_WRITE); |
184 | if (len2 != len) |
185 | return -EFAULT; |
186 | } |
187 | return 0; |
188 | } |
189 | |
190 | static int regwindow64_get(struct task_struct *target, |
191 | const struct pt_regs *regs, |
192 | struct reg_window *wbuf) |
193 | { |
194 | unsigned long rw_addr = regs->u_regs[UREG_I6]; |
195 | |
196 | if (!test_thread_64bit_stack(rw_addr)) { |
197 | struct reg_window32 win32; |
198 | int i; |
199 | |
200 | if (get_from_target(target, uaddr: rw_addr, kbuf: &win32, len: sizeof(win32))) |
201 | return -EFAULT; |
202 | for (i = 0; i < 8; i++) |
203 | wbuf->locals[i] = win32.locals[i]; |
204 | for (i = 0; i < 8; i++) |
205 | wbuf->ins[i] = win32.ins[i]; |
206 | } else { |
207 | rw_addr += STACK_BIAS; |
208 | if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf))) |
209 | return -EFAULT; |
210 | } |
211 | |
212 | return 0; |
213 | } |
214 | |
215 | static int regwindow64_set(struct task_struct *target, |
216 | const struct pt_regs *regs, |
217 | struct reg_window *wbuf) |
218 | { |
219 | unsigned long rw_addr = regs->u_regs[UREG_I6]; |
220 | |
221 | if (!test_thread_64bit_stack(rw_addr)) { |
222 | struct reg_window32 win32; |
223 | int i; |
224 | |
225 | for (i = 0; i < 8; i++) |
226 | win32.locals[i] = wbuf->locals[i]; |
227 | for (i = 0; i < 8; i++) |
228 | win32.ins[i] = wbuf->ins[i]; |
229 | |
230 | if (set_to_target(target, uaddr: rw_addr, kbuf: &win32, len: sizeof(win32))) |
231 | return -EFAULT; |
232 | } else { |
233 | rw_addr += STACK_BIAS; |
234 | if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf))) |
235 | return -EFAULT; |
236 | } |
237 | |
238 | return 0; |
239 | } |
240 | |
241 | enum sparc_regset { |
242 | REGSET_GENERAL, |
243 | REGSET_FP, |
244 | }; |
245 | |
246 | static int genregs64_get(struct task_struct *target, |
247 | const struct user_regset *regset, |
248 | struct membuf to) |
249 | { |
250 | const struct pt_regs *regs = task_pt_regs(target); |
251 | struct reg_window window; |
252 | |
253 | if (target == current) |
254 | flushw_user(); |
255 | |
256 | membuf_write(s: &to, v: regs->u_regs, size: 16 * sizeof(u64)); |
257 | if (!to.left) |
258 | return 0; |
259 | if (regwindow64_get(target, regs, wbuf: &window)) |
260 | return -EFAULT; |
261 | membuf_write(s: &to, v: &window, size: 16 * sizeof(u64)); |
262 | /* TSTATE, TPC, TNPC */ |
263 | membuf_write(s: &to, v: ®s->tstate, size: 3 * sizeof(u64)); |
264 | return membuf_store(&to, (u64)regs->y); |
265 | } |
266 | |
267 | static int genregs64_set(struct task_struct *target, |
268 | const struct user_regset *regset, |
269 | unsigned int pos, unsigned int count, |
270 | const void *kbuf, const void __user *ubuf) |
271 | { |
272 | struct pt_regs *regs = task_pt_regs(target); |
273 | int ret; |
274 | |
275 | if (target == current) |
276 | flushw_user(); |
277 | |
278 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
279 | data: regs->u_regs, |
280 | start_pos: 0, end_pos: 16 * sizeof(u64)); |
281 | if (!ret && count && pos < (32 * sizeof(u64))) { |
282 | struct reg_window window; |
283 | |
284 | if (regwindow64_get(target, regs, wbuf: &window)) |
285 | return -EFAULT; |
286 | |
287 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
288 | data: &window, |
289 | start_pos: 16 * sizeof(u64), |
290 | end_pos: 32 * sizeof(u64)); |
291 | |
292 | if (!ret && |
293 | regwindow64_set(target, regs, wbuf: &window)) |
294 | return -EFAULT; |
295 | } |
296 | |
297 | if (!ret && count > 0) { |
298 | unsigned long tstate; |
299 | |
300 | /* TSTATE */ |
301 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
302 | data: &tstate, |
303 | start_pos: 32 * sizeof(u64), |
304 | end_pos: 33 * sizeof(u64)); |
305 | if (!ret) { |
306 | /* Only the condition codes and the "in syscall" |
307 | * state can be modified in the %tstate register. |
308 | */ |
309 | tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL); |
310 | regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL); |
311 | regs->tstate |= tstate; |
312 | } |
313 | } |
314 | |
315 | if (!ret) { |
316 | /* TPC, TNPC */ |
317 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
318 | data: ®s->tpc, |
319 | start_pos: 33 * sizeof(u64), |
320 | end_pos: 35 * sizeof(u64)); |
321 | } |
322 | |
323 | if (!ret) { |
324 | unsigned long y = regs->y; |
325 | |
326 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
327 | data: &y, |
328 | start_pos: 35 * sizeof(u64), |
329 | end_pos: 36 * sizeof(u64)); |
330 | if (!ret) |
331 | regs->y = y; |
332 | } |
333 | |
334 | if (!ret) |
335 | user_regset_copyin_ignore(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
336 | start_pos: 36 * sizeof(u64), end_pos: -1); |
337 | |
338 | return ret; |
339 | } |
340 | |
341 | static int fpregs64_get(struct task_struct *target, |
342 | const struct user_regset *regset, |
343 | struct membuf to) |
344 | { |
345 | struct thread_info *t = task_thread_info(target); |
346 | unsigned long fprs; |
347 | |
348 | if (target == current) |
349 | save_and_clear_fpu(); |
350 | |
351 | fprs = t->fpsaved[0]; |
352 | |
353 | if (fprs & FPRS_DL) |
354 | membuf_write(s: &to, v: t->fpregs, size: 16 * sizeof(u64)); |
355 | else |
356 | membuf_zero(s: &to, size: 16 * sizeof(u64)); |
357 | |
358 | if (fprs & FPRS_DU) |
359 | membuf_write(s: &to, v: t->fpregs + 16, size: 16 * sizeof(u64)); |
360 | else |
361 | membuf_zero(s: &to, size: 16 * sizeof(u64)); |
362 | if (fprs & FPRS_FEF) { |
363 | membuf_store(&to, t->xfsr[0]); |
364 | membuf_store(&to, t->gsr[0]); |
365 | } else { |
366 | membuf_zero(s: &to, size: 2 * sizeof(u64)); |
367 | } |
368 | return membuf_store(&to, fprs); |
369 | } |
370 | |
371 | static int fpregs64_set(struct task_struct *target, |
372 | const struct user_regset *regset, |
373 | unsigned int pos, unsigned int count, |
374 | const void *kbuf, const void __user *ubuf) |
375 | { |
376 | unsigned long *fpregs = task_thread_info(target)->fpregs; |
377 | unsigned long fprs; |
378 | int ret; |
379 | |
380 | if (target == current) |
381 | save_and_clear_fpu(); |
382 | |
383 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
384 | data: fpregs, |
385 | start_pos: 0, end_pos: 32 * sizeof(u64)); |
386 | if (!ret) |
387 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
388 | task_thread_info(target)->xfsr, |
389 | start_pos: 32 * sizeof(u64), |
390 | end_pos: 33 * sizeof(u64)); |
391 | if (!ret) |
392 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
393 | task_thread_info(target)->gsr, |
394 | start_pos: 33 * sizeof(u64), |
395 | end_pos: 34 * sizeof(u64)); |
396 | |
397 | fprs = task_thread_info(target)->fpsaved[0]; |
398 | if (!ret && count > 0) { |
399 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
400 | data: &fprs, |
401 | start_pos: 34 * sizeof(u64), |
402 | end_pos: 35 * sizeof(u64)); |
403 | } |
404 | |
405 | fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU); |
406 | task_thread_info(target)->fpsaved[0] = fprs; |
407 | |
408 | if (!ret) |
409 | user_regset_copyin_ignore(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
410 | start_pos: 35 * sizeof(u64), end_pos: -1); |
411 | return ret; |
412 | } |
413 | |
414 | static const struct user_regset sparc64_regsets[] = { |
415 | /* Format is: |
416 | * G0 --> G7 |
417 | * O0 --> O7 |
418 | * L0 --> L7 |
419 | * I0 --> I7 |
420 | * TSTATE, TPC, TNPC, Y |
421 | */ |
422 | [REGSET_GENERAL] = { |
423 | .core_note_type = NT_PRSTATUS, |
424 | .n = 36, |
425 | .size = sizeof(u64), .align = sizeof(u64), |
426 | .regset_get = genregs64_get, .set = genregs64_set |
427 | }, |
428 | /* Format is: |
429 | * F0 --> F63 |
430 | * FSR |
431 | * GSR |
432 | * FPRS |
433 | */ |
434 | [REGSET_FP] = { |
435 | .core_note_type = NT_PRFPREG, |
436 | .n = 35, |
437 | .size = sizeof(u64), .align = sizeof(u64), |
438 | .regset_get = fpregs64_get, .set = fpregs64_set |
439 | }, |
440 | }; |
441 | |
442 | static int getregs64_get(struct task_struct *target, |
443 | const struct user_regset *regset, |
444 | struct membuf to) |
445 | { |
446 | const struct pt_regs *regs = task_pt_regs(target); |
447 | |
448 | if (target == current) |
449 | flushw_user(); |
450 | |
451 | membuf_write(s: &to, v: regs->u_regs + 1, size: 15 * sizeof(u64)); |
452 | membuf_store(&to, (u64)0); |
453 | membuf_write(s: &to, v: ®s->tstate, size: 3 * sizeof(u64)); |
454 | return membuf_store(&to, (u64)regs->y); |
455 | } |
456 | |
457 | static int setregs64_set(struct task_struct *target, |
458 | const struct user_regset *regset, |
459 | unsigned int pos, unsigned int count, |
460 | const void *kbuf, const void __user *ubuf) |
461 | { |
462 | struct pt_regs *regs = task_pt_regs(target); |
463 | unsigned long y = regs->y; |
464 | unsigned long tstate; |
465 | int ret; |
466 | |
467 | if (target == current) |
468 | flushw_user(); |
469 | |
470 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
471 | data: regs->u_regs + 1, |
472 | start_pos: 0 * sizeof(u64), |
473 | end_pos: 15 * sizeof(u64)); |
474 | if (ret) |
475 | return ret; |
476 | user_regset_copyin_ignore(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
477 | start_pos: 15 * sizeof(u64), end_pos: 16 * sizeof(u64)); |
478 | /* TSTATE */ |
479 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
480 | data: &tstate, |
481 | start_pos: 16 * sizeof(u64), |
482 | end_pos: 17 * sizeof(u64)); |
483 | if (ret) |
484 | return ret; |
485 | /* Only the condition codes and the "in syscall" |
486 | * state can be modified in the %tstate register. |
487 | */ |
488 | tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL); |
489 | regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL); |
490 | regs->tstate |= tstate; |
491 | |
492 | /* TPC, TNPC */ |
493 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
494 | data: ®s->tpc, |
495 | start_pos: 17 * sizeof(u64), |
496 | end_pos: 19 * sizeof(u64)); |
497 | if (ret) |
498 | return ret; |
499 | /* Y */ |
500 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
501 | data: &y, |
502 | start_pos: 19 * sizeof(u64), |
503 | end_pos: 20 * sizeof(u64)); |
504 | if (!ret) |
505 | regs->y = y; |
506 | return ret; |
507 | } |
508 | |
509 | static const struct user_regset ptrace64_regsets[] = { |
510 | /* Format is: |
511 | * G1 --> G7 |
512 | * O0 --> O7 |
513 | * 0 |
514 | * TSTATE, TPC, TNPC, Y |
515 | */ |
516 | [REGSET_GENERAL] = { |
517 | .n = 20, .size = sizeof(u64), |
518 | .regset_get = getregs64_get, .set = setregs64_set, |
519 | }, |
520 | }; |
521 | |
522 | static const struct user_regset_view ptrace64_view = { |
523 | .regsets = ptrace64_regsets, .n = ARRAY_SIZE(ptrace64_regsets) |
524 | }; |
525 | |
526 | static const struct user_regset_view user_sparc64_view = { |
527 | .name = "sparc64" , .e_machine = EM_SPARCV9, |
528 | .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets) |
529 | }; |
530 | |
531 | #ifdef CONFIG_COMPAT |
532 | static int genregs32_get(struct task_struct *target, |
533 | const struct user_regset *regset, |
534 | struct membuf to) |
535 | { |
536 | const struct pt_regs *regs = task_pt_regs(target); |
537 | u32 uregs[16]; |
538 | int i; |
539 | |
540 | if (target == current) |
541 | flushw_user(); |
542 | |
543 | for (i = 0; i < 16; i++) |
544 | membuf_store(&to, (u32)regs->u_regs[i]); |
545 | if (!to.left) |
546 | return 0; |
547 | if (get_from_target(target, regs->u_regs[UREG_I6], |
548 | uregs, sizeof(uregs))) |
549 | return -EFAULT; |
550 | membuf_write(s: &to, v: uregs, size: 16 * sizeof(u32)); |
551 | membuf_store(&to, (u32)tstate_to_psr(regs->tstate)); |
552 | membuf_store(&to, (u32)(regs->tpc)); |
553 | membuf_store(&to, (u32)(regs->tnpc)); |
554 | membuf_store(&to, (u32)(regs->y)); |
555 | return membuf_zero(s: &to, size: 2 * sizeof(u32)); |
556 | } |
557 | |
558 | static int genregs32_set(struct task_struct *target, |
559 | const struct user_regset *regset, |
560 | unsigned int pos, unsigned int count, |
561 | const void *kbuf, const void __user *ubuf) |
562 | { |
563 | struct pt_regs *regs = task_pt_regs(target); |
564 | compat_ulong_t __user *reg_window; |
565 | const compat_ulong_t *k = kbuf; |
566 | const compat_ulong_t __user *u = ubuf; |
567 | compat_ulong_t reg; |
568 | |
569 | if (target == current) |
570 | flushw_user(); |
571 | |
572 | pos /= sizeof(reg); |
573 | count /= sizeof(reg); |
574 | |
575 | if (kbuf) { |
576 | for (; count > 0 && pos < 16; count--) |
577 | regs->u_regs[pos++] = *k++; |
578 | |
579 | reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6]; |
580 | reg_window -= 16; |
581 | if (target == current) { |
582 | for (; count > 0 && pos < 32; count--) { |
583 | if (put_user(*k++, ®_window[pos++])) |
584 | return -EFAULT; |
585 | } |
586 | } else { |
587 | for (; count > 0 && pos < 32; count--) { |
588 | if (access_process_vm(tsk: target, |
589 | addr: (unsigned long) |
590 | ®_window[pos], |
591 | buf: (void *) k, |
592 | len: sizeof(*k), |
593 | gup_flags: FOLL_FORCE | FOLL_WRITE) |
594 | != sizeof(*k)) |
595 | return -EFAULT; |
596 | k++; |
597 | pos++; |
598 | } |
599 | } |
600 | } else { |
601 | for (; count > 0 && pos < 16; count--) { |
602 | if (get_user(reg, u++)) |
603 | return -EFAULT; |
604 | regs->u_regs[pos++] = reg; |
605 | } |
606 | |
607 | reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6]; |
608 | reg_window -= 16; |
609 | if (target == current) { |
610 | for (; count > 0 && pos < 32; count--) { |
611 | if (get_user(reg, u++) || |
612 | put_user(reg, ®_window[pos++])) |
613 | return -EFAULT; |
614 | } |
615 | } else { |
616 | for (; count > 0 && pos < 32; count--) { |
617 | if (get_user(reg, u++)) |
618 | return -EFAULT; |
619 | if (access_process_vm(tsk: target, |
620 | addr: (unsigned long) |
621 | ®_window[pos], |
622 | buf: ®, len: sizeof(reg), |
623 | gup_flags: FOLL_FORCE | FOLL_WRITE) |
624 | != sizeof(reg)) |
625 | return -EFAULT; |
626 | pos++; |
627 | u++; |
628 | } |
629 | } |
630 | } |
631 | while (count > 0) { |
632 | unsigned long tstate; |
633 | |
634 | if (kbuf) |
635 | reg = *k++; |
636 | else if (get_user(reg, u++)) |
637 | return -EFAULT; |
638 | |
639 | switch (pos) { |
640 | case 32: /* PSR */ |
641 | tstate = regs->tstate; |
642 | tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL); |
643 | tstate |= psr_to_tstate_icc(reg); |
644 | if (reg & PSR_SYSCALL) |
645 | tstate |= TSTATE_SYSCALL; |
646 | regs->tstate = tstate; |
647 | break; |
648 | case 33: /* PC */ |
649 | regs->tpc = reg; |
650 | break; |
651 | case 34: /* NPC */ |
652 | regs->tnpc = reg; |
653 | break; |
654 | case 35: /* Y */ |
655 | regs->y = reg; |
656 | break; |
657 | case 36: /* WIM */ |
658 | case 37: /* TBR */ |
659 | break; |
660 | default: |
661 | goto finish; |
662 | } |
663 | |
664 | pos++; |
665 | count--; |
666 | } |
667 | finish: |
668 | pos *= sizeof(reg); |
669 | count *= sizeof(reg); |
670 | |
671 | user_regset_copyin_ignore(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
672 | start_pos: 38 * sizeof(reg), end_pos: -1); |
673 | return 0; |
674 | } |
675 | |
676 | static int fpregs32_get(struct task_struct *target, |
677 | const struct user_regset *regset, |
678 | struct membuf to) |
679 | { |
680 | struct thread_info *t = task_thread_info(target); |
681 | bool enabled; |
682 | |
683 | if (target == current) |
684 | save_and_clear_fpu(); |
685 | |
686 | enabled = t->fpsaved[0] & FPRS_FEF; |
687 | |
688 | membuf_write(s: &to, v: t->fpregs, size: 32 * sizeof(u32)); |
689 | membuf_zero(s: &to, size: sizeof(u32)); |
690 | if (enabled) |
691 | membuf_store(&to, (u32)t->xfsr[0]); |
692 | else |
693 | membuf_zero(s: &to, size: sizeof(u32)); |
694 | membuf_store(&to, (u32)((enabled << 8) | (8 << 16))); |
695 | return membuf_zero(s: &to, size: 64 * sizeof(u32)); |
696 | } |
697 | |
698 | static int fpregs32_set(struct task_struct *target, |
699 | const struct user_regset *regset, |
700 | unsigned int pos, unsigned int count, |
701 | const void *kbuf, const void __user *ubuf) |
702 | { |
703 | unsigned long *fpregs = task_thread_info(target)->fpregs; |
704 | unsigned long fprs; |
705 | int ret; |
706 | |
707 | if (target == current) |
708 | save_and_clear_fpu(); |
709 | |
710 | fprs = task_thread_info(target)->fpsaved[0]; |
711 | |
712 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
713 | data: fpregs, |
714 | start_pos: 0, end_pos: 32 * sizeof(u32)); |
715 | if (!ret) |
716 | user_regset_copyin_ignore(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
717 | start_pos: 32 * sizeof(u32), |
718 | end_pos: 33 * sizeof(u32)); |
719 | if (!ret && count > 0) { |
720 | compat_ulong_t fsr; |
721 | unsigned long val; |
722 | |
723 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
724 | data: &fsr, |
725 | start_pos: 33 * sizeof(u32), |
726 | end_pos: 34 * sizeof(u32)); |
727 | if (!ret) { |
728 | val = task_thread_info(target)->xfsr[0]; |
729 | val &= 0xffffffff00000000UL; |
730 | val |= fsr; |
731 | task_thread_info(target)->xfsr[0] = val; |
732 | } |
733 | } |
734 | |
735 | fprs |= (FPRS_FEF | FPRS_DL); |
736 | task_thread_info(target)->fpsaved[0] = fprs; |
737 | |
738 | if (!ret) |
739 | user_regset_copyin_ignore(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
740 | start_pos: 34 * sizeof(u32), end_pos: -1); |
741 | return ret; |
742 | } |
743 | |
744 | static const struct user_regset sparc32_regsets[] = { |
745 | /* Format is: |
746 | * G0 --> G7 |
747 | * O0 --> O7 |
748 | * L0 --> L7 |
749 | * I0 --> I7 |
750 | * PSR, PC, nPC, Y, WIM, TBR |
751 | */ |
752 | [REGSET_GENERAL] = { |
753 | .core_note_type = NT_PRSTATUS, |
754 | .n = 38, |
755 | .size = sizeof(u32), .align = sizeof(u32), |
756 | .regset_get = genregs32_get, .set = genregs32_set |
757 | }, |
758 | /* Format is: |
759 | * F0 --> F31 |
760 | * empty 32-bit word |
761 | * FSR (32--bit word) |
762 | * FPU QUEUE COUNT (8-bit char) |
763 | * FPU QUEUE ENTRYSIZE (8-bit char) |
764 | * FPU ENABLED (8-bit char) |
765 | * empty 8-bit char |
766 | * FPU QUEUE (64 32-bit ints) |
767 | */ |
768 | [REGSET_FP] = { |
769 | .core_note_type = NT_PRFPREG, |
770 | .n = 99, |
771 | .size = sizeof(u32), .align = sizeof(u32), |
772 | .regset_get = fpregs32_get, .set = fpregs32_set |
773 | }, |
774 | }; |
775 | |
776 | static int getregs_get(struct task_struct *target, |
777 | const struct user_regset *regset, |
778 | struct membuf to) |
779 | { |
780 | const struct pt_regs *regs = task_pt_regs(target); |
781 | int i; |
782 | |
783 | if (target == current) |
784 | flushw_user(); |
785 | |
786 | membuf_store(&to, (u32)tstate_to_psr(regs->tstate)); |
787 | membuf_store(&to, (u32)(regs->tpc)); |
788 | membuf_store(&to, (u32)(regs->tnpc)); |
789 | membuf_store(&to, (u32)(regs->y)); |
790 | for (i = 1; i < 16; i++) |
791 | membuf_store(&to, (u32)regs->u_regs[i]); |
792 | return to.left; |
793 | } |
794 | |
795 | static int setregs_set(struct task_struct *target, |
796 | const struct user_regset *regset, |
797 | unsigned int pos, unsigned int count, |
798 | const void *kbuf, const void __user *ubuf) |
799 | { |
800 | struct pt_regs *regs = task_pt_regs(target); |
801 | unsigned long tstate; |
802 | u32 uregs[19]; |
803 | int i, ret; |
804 | |
805 | if (target == current) |
806 | flushw_user(); |
807 | |
808 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
809 | data: uregs, |
810 | start_pos: 0, end_pos: 19 * sizeof(u32)); |
811 | if (ret) |
812 | return ret; |
813 | |
814 | tstate = regs->tstate; |
815 | tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL); |
816 | tstate |= psr_to_tstate_icc(uregs[0]); |
817 | if (uregs[0] & PSR_SYSCALL) |
818 | tstate |= TSTATE_SYSCALL; |
819 | regs->tstate = tstate; |
820 | regs->tpc = uregs[1]; |
821 | regs->tnpc = uregs[2]; |
822 | regs->y = uregs[3]; |
823 | |
824 | for (i = 1; i < 15; i++) |
825 | regs->u_regs[i] = uregs[3 + i]; |
826 | return 0; |
827 | } |
828 | |
829 | static int getfpregs_get(struct task_struct *target, |
830 | const struct user_regset *regset, |
831 | struct membuf to) |
832 | { |
833 | struct thread_info *t = task_thread_info(target); |
834 | |
835 | if (target == current) |
836 | save_and_clear_fpu(); |
837 | |
838 | membuf_write(s: &to, v: t->fpregs, size: 32 * sizeof(u32)); |
839 | if (t->fpsaved[0] & FPRS_FEF) |
840 | membuf_store(&to, (u32)t->xfsr[0]); |
841 | else |
842 | membuf_zero(s: &to, size: sizeof(u32)); |
843 | return membuf_zero(s: &to, size: 35 * sizeof(u32)); |
844 | } |
845 | |
846 | static int setfpregs_set(struct task_struct *target, |
847 | const struct user_regset *regset, |
848 | unsigned int pos, unsigned int count, |
849 | const void *kbuf, const void __user *ubuf) |
850 | { |
851 | unsigned long *fpregs = task_thread_info(target)->fpregs; |
852 | unsigned long fprs; |
853 | int ret; |
854 | |
855 | if (target == current) |
856 | save_and_clear_fpu(); |
857 | |
858 | fprs = task_thread_info(target)->fpsaved[0]; |
859 | |
860 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
861 | data: fpregs, |
862 | start_pos: 0, end_pos: 32 * sizeof(u32)); |
863 | if (!ret) { |
864 | compat_ulong_t fsr; |
865 | unsigned long val; |
866 | |
867 | ret = user_regset_copyin(pos: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf, |
868 | data: &fsr, |
869 | start_pos: 32 * sizeof(u32), |
870 | end_pos: 33 * sizeof(u32)); |
871 | if (!ret) { |
872 | val = task_thread_info(target)->xfsr[0]; |
873 | val &= 0xffffffff00000000UL; |
874 | val |= fsr; |
875 | task_thread_info(target)->xfsr[0] = val; |
876 | } |
877 | } |
878 | |
879 | fprs |= (FPRS_FEF | FPRS_DL); |
880 | task_thread_info(target)->fpsaved[0] = fprs; |
881 | return ret; |
882 | } |
883 | |
884 | static const struct user_regset ptrace32_regsets[] = { |
885 | [REGSET_GENERAL] = { |
886 | .n = 19, .size = sizeof(u32), |
887 | .regset_get = getregs_get, .set = setregs_set, |
888 | }, |
889 | [REGSET_FP] = { |
890 | .n = 68, .size = sizeof(u32), |
891 | .regset_get = getfpregs_get, .set = setfpregs_set, |
892 | }, |
893 | }; |
894 | |
895 | static const struct user_regset_view ptrace32_view = { |
896 | .regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets) |
897 | }; |
898 | |
899 | static const struct user_regset_view user_sparc32_view = { |
900 | .name = "sparc" , .e_machine = EM_SPARC, |
901 | .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets) |
902 | }; |
903 | #endif /* CONFIG_COMPAT */ |
904 | |
905 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
906 | { |
907 | #ifdef CONFIG_COMPAT |
908 | if (test_tsk_thread_flag(task, TIF_32BIT)) |
909 | return &user_sparc32_view; |
910 | #endif |
911 | return &user_sparc64_view; |
912 | } |
913 | |
914 | #ifdef CONFIG_COMPAT |
915 | struct compat_fps { |
916 | unsigned int regs[32]; |
917 | unsigned int fsr; |
918 | unsigned int flags; |
919 | unsigned int ; |
920 | unsigned int fpqd; |
921 | struct compat_fq { |
922 | unsigned int insnaddr; |
923 | unsigned int insn; |
924 | } fpq[16]; |
925 | }; |
926 | |
927 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
928 | compat_ulong_t caddr, compat_ulong_t cdata) |
929 | { |
930 | compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4]; |
931 | struct pt_regs32 __user *pregs; |
932 | struct compat_fps __user *fps; |
933 | unsigned long addr2 = caddr2; |
934 | unsigned long addr = caddr; |
935 | unsigned long data = cdata; |
936 | int ret; |
937 | |
938 | pregs = (struct pt_regs32 __user *) addr; |
939 | fps = (struct compat_fps __user *) addr; |
940 | |
941 | switch (request) { |
942 | case PTRACE_PEEKUSR: |
943 | ret = (addr != 0) ? -EIO : 0; |
944 | break; |
945 | |
946 | case PTRACE_GETREGS: |
947 | ret = copy_regset_to_user(target: child, view: &ptrace32_view, |
948 | setno: REGSET_GENERAL, offset: 0, |
949 | size: 19 * sizeof(u32), |
950 | data: pregs); |
951 | break; |
952 | |
953 | case PTRACE_SETREGS: |
954 | ret = copy_regset_from_user(target: child, view: &ptrace32_view, |
955 | setno: REGSET_GENERAL, offset: 0, |
956 | size: 19 * sizeof(u32), |
957 | data: pregs); |
958 | break; |
959 | |
960 | case PTRACE_GETFPREGS: |
961 | ret = copy_regset_to_user(target: child, view: &ptrace32_view, |
962 | setno: REGSET_FP, offset: 0, |
963 | size: 68 * sizeof(u32), |
964 | data: fps); |
965 | break; |
966 | |
967 | case PTRACE_SETFPREGS: |
968 | ret = copy_regset_from_user(target: child, view: &ptrace32_view, |
969 | setno: REGSET_FP, offset: 0, |
970 | size: 33 * sizeof(u32), |
971 | data: fps); |
972 | break; |
973 | |
974 | case PTRACE_READTEXT: |
975 | case PTRACE_READDATA: |
976 | ret = ptrace_readdata(tsk: child, src: addr, |
977 | dst: (char __user *)addr2, len: data); |
978 | if (ret == data) |
979 | ret = 0; |
980 | else if (ret >= 0) |
981 | ret = -EIO; |
982 | break; |
983 | |
984 | case PTRACE_WRITETEXT: |
985 | case PTRACE_WRITEDATA: |
986 | ret = ptrace_writedata(tsk: child, src: (char __user *) addr2, |
987 | dst: addr, len: data); |
988 | if (ret == data) |
989 | ret = 0; |
990 | else if (ret >= 0) |
991 | ret = -EIO; |
992 | break; |
993 | |
994 | default: |
995 | if (request == PTRACE_SPARC_DETACH) |
996 | request = PTRACE_DETACH; |
997 | ret = compat_ptrace_request(child, request, addr, data); |
998 | break; |
999 | } |
1000 | |
1001 | return ret; |
1002 | } |
1003 | #endif /* CONFIG_COMPAT */ |
1004 | |
1005 | struct fps { |
1006 | unsigned int regs[64]; |
1007 | unsigned long fsr; |
1008 | }; |
1009 | |
1010 | long arch_ptrace(struct task_struct *child, long request, |
1011 | unsigned long addr, unsigned long data) |
1012 | { |
1013 | const struct user_regset_view *view = task_user_regset_view(current); |
1014 | unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4]; |
1015 | struct pt_regs __user *pregs; |
1016 | struct fps __user *fps; |
1017 | void __user *addr2p; |
1018 | int ret; |
1019 | |
1020 | pregs = (struct pt_regs __user *) addr; |
1021 | fps = (struct fps __user *) addr; |
1022 | addr2p = (void __user *) addr2; |
1023 | |
1024 | switch (request) { |
1025 | case PTRACE_PEEKUSR: |
1026 | ret = (addr != 0) ? -EIO : 0; |
1027 | break; |
1028 | |
1029 | case PTRACE_GETREGS64: |
1030 | ret = copy_regset_to_user(target: child, view: &ptrace64_view, |
1031 | setno: REGSET_GENERAL, offset: 0, |
1032 | size: 19 * sizeof(u64), |
1033 | data: pregs); |
1034 | break; |
1035 | |
1036 | case PTRACE_SETREGS64: |
1037 | ret = copy_regset_from_user(target: child, view: &ptrace64_view, |
1038 | setno: REGSET_GENERAL, offset: 0, |
1039 | size: 19 * sizeof(u64), |
1040 | data: pregs); |
1041 | break; |
1042 | |
1043 | case PTRACE_GETFPREGS64: |
1044 | ret = copy_regset_to_user(target: child, view, setno: REGSET_FP, |
1045 | offset: 0 * sizeof(u64), |
1046 | size: 33 * sizeof(u64), |
1047 | data: fps); |
1048 | break; |
1049 | |
1050 | case PTRACE_SETFPREGS64: |
1051 | ret = copy_regset_from_user(target: child, view, setno: REGSET_FP, |
1052 | offset: 0 * sizeof(u64), |
1053 | size: 33 * sizeof(u64), |
1054 | data: fps); |
1055 | break; |
1056 | |
1057 | case PTRACE_READTEXT: |
1058 | case PTRACE_READDATA: |
1059 | ret = ptrace_readdata(tsk: child, src: addr, dst: addr2p, len: data); |
1060 | if (ret == data) |
1061 | ret = 0; |
1062 | else if (ret >= 0) |
1063 | ret = -EIO; |
1064 | break; |
1065 | |
1066 | case PTRACE_WRITETEXT: |
1067 | case PTRACE_WRITEDATA: |
1068 | ret = ptrace_writedata(tsk: child, src: addr2p, dst: addr, len: data); |
1069 | if (ret == data) |
1070 | ret = 0; |
1071 | else if (ret >= 0) |
1072 | ret = -EIO; |
1073 | break; |
1074 | |
1075 | default: |
1076 | if (request == PTRACE_SPARC_DETACH) |
1077 | request = PTRACE_DETACH; |
1078 | ret = ptrace_request(child, request, addr, data); |
1079 | break; |
1080 | } |
1081 | |
1082 | return ret; |
1083 | } |
1084 | |
1085 | asmlinkage int syscall_trace_enter(struct pt_regs *regs) |
1086 | { |
1087 | int ret = 0; |
1088 | |
1089 | /* do the secure computing check first */ |
1090 | secure_computing_strict(regs->u_regs[UREG_G1]); |
1091 | |
1092 | if (test_thread_flag(TIF_NOHZ)) |
1093 | user_exit(); |
1094 | |
1095 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
1096 | ret = ptrace_report_syscall_entry(regs); |
1097 | |
1098 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1099 | trace_sys_enter(regs, regs->u_regs[UREG_G1]); |
1100 | |
1101 | audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0], |
1102 | regs->u_regs[UREG_I1], regs->u_regs[UREG_I2], |
1103 | regs->u_regs[UREG_I3]); |
1104 | |
1105 | return ret; |
1106 | } |
1107 | |
1108 | asmlinkage void syscall_trace_leave(struct pt_regs *regs) |
1109 | { |
1110 | if (test_thread_flag(TIF_NOHZ)) |
1111 | user_exit(); |
1112 | |
1113 | audit_syscall_exit(pt_regs: regs); |
1114 | |
1115 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1116 | trace_sys_exit(regs, regs->u_regs[UREG_I0]); |
1117 | |
1118 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
1119 | ptrace_report_syscall_exit(regs, step: 0); |
1120 | |
1121 | if (test_thread_flag(TIF_NOHZ)) |
1122 | user_enter(); |
1123 | } |
1124 | |
1125 | /** |
1126 | * regs_query_register_offset() - query register offset from its name |
1127 | * @name: the name of a register |
1128 | * |
1129 | * regs_query_register_offset() returns the offset of a register in struct |
1130 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; |
1131 | */ |
1132 | int regs_query_register_offset(const char *name) |
1133 | { |
1134 | const struct pt_regs_offset *roff; |
1135 | |
1136 | for (roff = regoffset_table; roff->name != NULL; roff++) |
1137 | if (!strcmp(roff->name, name)) |
1138 | return roff->offset; |
1139 | return -EINVAL; |
1140 | } |
1141 | |
1142 | /** |
1143 | * regs_within_kernel_stack() - check the address in the stack |
1144 | * @regs: pt_regs which contains kernel stack pointer. |
1145 | * @addr: address which is checked. |
1146 | * |
1147 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
1148 | * If @addr is within the kernel stack, it returns true. If not, returns false. |
1149 | */ |
1150 | static inline int regs_within_kernel_stack(struct pt_regs *regs, |
1151 | unsigned long addr) |
1152 | { |
1153 | unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS; |
1154 | return ((addr & ~(THREAD_SIZE - 1)) == |
1155 | (ksp & ~(THREAD_SIZE - 1))); |
1156 | } |
1157 | |
1158 | /** |
1159 | * regs_get_kernel_stack_nth() - get Nth entry of the stack |
1160 | * @regs: pt_regs which contains kernel stack pointer. |
1161 | * @n: stack entry number. |
1162 | * |
1163 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
1164 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, |
1165 | * this returns 0. |
1166 | */ |
1167 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) |
1168 | { |
1169 | unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS; |
1170 | unsigned long *addr = (unsigned long *)ksp; |
1171 | addr += n; |
1172 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) |
1173 | return *addr; |
1174 | else |
1175 | return 0; |
1176 | } |
1177 | |