Commit | Line | Data |
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587064b6 PA |
1 | /* |
2 | * Copyright (C) 2014 ARM Limited | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
c852f320 | 9 | #include <linux/cpu.h> |
587064b6 PA |
10 | #include <linux/init.h> |
11 | #include <linux/list.h> | |
bd35a4ad PA |
12 | #include <linux/perf_event.h> |
13 | #include <linux/sched.h> | |
587064b6 PA |
14 | #include <linux/slab.h> |
15 | #include <linux/sysctl.h> | |
16 | ||
338d4f49 JM |
17 | #include <asm/alternative.h> |
18 | #include <asm/cpufeature.h> | |
bd35a4ad PA |
19 | #include <asm/insn.h> |
20 | #include <asm/opcodes.h> | |
870828e5 | 21 | #include <asm/sysreg.h> |
bd35a4ad | 22 | #include <asm/system_misc.h> |
587064b6 | 23 | #include <asm/traps.h> |
bd35a4ad | 24 | #include <asm/uaccess.h> |
736d474f | 25 | #include <asm/cpufeature.h> |
587064b6 | 26 | |
d784e298 PA |
27 | #define CREATE_TRACE_POINTS |
28 | #include "trace-events-emulation.h" | |
29 | ||
587064b6 PA |
30 | /* |
31 | * The runtime support for deprecated instruction support can be in one of | |
32 | * following three states - | |
33 | * | |
34 | * 0 = undef | |
35 | * 1 = emulate (software emulation) | |
36 | * 2 = hw (supported in hardware) | |
37 | */ | |
38 | enum insn_emulation_mode { | |
39 | INSN_UNDEF, | |
40 | INSN_EMULATE, | |
41 | INSN_HW, | |
42 | }; | |
43 | ||
44 | enum legacy_insn_status { | |
45 | INSN_DEPRECATED, | |
46 | INSN_OBSOLETE, | |
47 | }; | |
48 | ||
49 | struct insn_emulation_ops { | |
50 | const char *name; | |
51 | enum legacy_insn_status status; | |
52 | struct undef_hook *hooks; | |
53 | int (*set_hw_mode)(bool enable); | |
54 | }; | |
55 | ||
56 | struct insn_emulation { | |
57 | struct list_head node; | |
58 | struct insn_emulation_ops *ops; | |
59 | int current_mode; | |
60 | int min; | |
61 | int max; | |
62 | }; | |
63 | ||
64 | static LIST_HEAD(insn_emulation); | |
65 | static int nr_insn_emulated; | |
66 | static DEFINE_RAW_SPINLOCK(insn_emulation_lock); | |
67 | ||
68 | static void register_emulation_hooks(struct insn_emulation_ops *ops) | |
69 | { | |
70 | struct undef_hook *hook; | |
71 | ||
72 | BUG_ON(!ops->hooks); | |
73 | ||
74 | for (hook = ops->hooks; hook->instr_mask; hook++) | |
75 | register_undef_hook(hook); | |
76 | ||
77 | pr_notice("Registered %s emulation handler\n", ops->name); | |
78 | } | |
79 | ||
80 | static void remove_emulation_hooks(struct insn_emulation_ops *ops) | |
81 | { | |
82 | struct undef_hook *hook; | |
83 | ||
84 | BUG_ON(!ops->hooks); | |
85 | ||
86 | for (hook = ops->hooks; hook->instr_mask; hook++) | |
87 | unregister_undef_hook(hook); | |
88 | ||
89 | pr_notice("Removed %s emulation handler\n", ops->name); | |
90 | } | |
91 | ||
736d474f SP |
92 | static void enable_insn_hw_mode(void *data) |
93 | { | |
94 | struct insn_emulation *insn = (struct insn_emulation *)data; | |
95 | if (insn->ops->set_hw_mode) | |
96 | insn->ops->set_hw_mode(true); | |
97 | } | |
98 | ||
99 | static void disable_insn_hw_mode(void *data) | |
100 | { | |
101 | struct insn_emulation *insn = (struct insn_emulation *)data; | |
102 | if (insn->ops->set_hw_mode) | |
103 | insn->ops->set_hw_mode(false); | |
104 | } | |
105 | ||
106 | /* Run set_hw_mode(mode) on all active CPUs */ | |
107 | static int run_all_cpu_set_hw_mode(struct insn_emulation *insn, bool enable) | |
108 | { | |
109 | if (!insn->ops->set_hw_mode) | |
110 | return -EINVAL; | |
111 | if (enable) | |
112 | on_each_cpu(enable_insn_hw_mode, (void *)insn, true); | |
113 | else | |
114 | on_each_cpu(disable_insn_hw_mode, (void *)insn, true); | |
115 | return 0; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Run set_hw_mode for all insns on a starting CPU. | |
120 | * Returns: | |
121 | * 0 - If all the hooks ran successfully. | |
122 | * -EINVAL - At least one hook is not supported by the CPU. | |
123 | */ | |
124 | static int run_all_insn_set_hw_mode(unsigned long cpu) | |
125 | { | |
126 | int rc = 0; | |
127 | unsigned long flags; | |
128 | struct insn_emulation *insn; | |
129 | ||
130 | raw_spin_lock_irqsave(&insn_emulation_lock, flags); | |
131 | list_for_each_entry(insn, &insn_emulation, node) { | |
132 | bool enable = (insn->current_mode == INSN_HW); | |
133 | if (insn->ops->set_hw_mode && insn->ops->set_hw_mode(enable)) { | |
134 | pr_warn("CPU[%ld] cannot support the emulation of %s", | |
135 | cpu, insn->ops->name); | |
136 | rc = -EINVAL; | |
137 | } | |
138 | } | |
139 | raw_spin_unlock_irqrestore(&insn_emulation_lock, flags); | |
140 | return rc; | |
141 | } | |
142 | ||
587064b6 PA |
143 | static int update_insn_emulation_mode(struct insn_emulation *insn, |
144 | enum insn_emulation_mode prev) | |
145 | { | |
146 | int ret = 0; | |
147 | ||
148 | switch (prev) { | |
149 | case INSN_UNDEF: /* Nothing to be done */ | |
150 | break; | |
151 | case INSN_EMULATE: | |
152 | remove_emulation_hooks(insn->ops); | |
153 | break; | |
154 | case INSN_HW: | |
736d474f | 155 | if (!run_all_cpu_set_hw_mode(insn, false)) |
587064b6 | 156 | pr_notice("Disabled %s support\n", insn->ops->name); |
587064b6 PA |
157 | break; |
158 | } | |
159 | ||
160 | switch (insn->current_mode) { | |
161 | case INSN_UNDEF: | |
162 | break; | |
163 | case INSN_EMULATE: | |
164 | register_emulation_hooks(insn->ops); | |
165 | break; | |
166 | case INSN_HW: | |
736d474f SP |
167 | ret = run_all_cpu_set_hw_mode(insn, true); |
168 | if (!ret) | |
587064b6 | 169 | pr_notice("Enabled %s support\n", insn->ops->name); |
587064b6 PA |
170 | break; |
171 | } | |
172 | ||
173 | return ret; | |
174 | } | |
175 | ||
176 | static void register_insn_emulation(struct insn_emulation_ops *ops) | |
177 | { | |
178 | unsigned long flags; | |
179 | struct insn_emulation *insn; | |
180 | ||
181 | insn = kzalloc(sizeof(*insn), GFP_KERNEL); | |
182 | insn->ops = ops; | |
183 | insn->min = INSN_UNDEF; | |
184 | ||
185 | switch (ops->status) { | |
186 | case INSN_DEPRECATED: | |
187 | insn->current_mode = INSN_EMULATE; | |
736d474f SP |
188 | /* Disable the HW mode if it was turned on at early boot time */ |
189 | run_all_cpu_set_hw_mode(insn, false); | |
587064b6 PA |
190 | insn->max = INSN_HW; |
191 | break; | |
192 | case INSN_OBSOLETE: | |
193 | insn->current_mode = INSN_UNDEF; | |
194 | insn->max = INSN_EMULATE; | |
195 | break; | |
196 | } | |
197 | ||
198 | raw_spin_lock_irqsave(&insn_emulation_lock, flags); | |
199 | list_add(&insn->node, &insn_emulation); | |
200 | nr_insn_emulated++; | |
201 | raw_spin_unlock_irqrestore(&insn_emulation_lock, flags); | |
202 | ||
203 | /* Register any handlers if required */ | |
204 | update_insn_emulation_mode(insn, INSN_UNDEF); | |
205 | } | |
206 | ||
207 | static int emulation_proc_handler(struct ctl_table *table, int write, | |
208 | void __user *buffer, size_t *lenp, | |
209 | loff_t *ppos) | |
210 | { | |
211 | int ret = 0; | |
212 | struct insn_emulation *insn = (struct insn_emulation *) table->data; | |
213 | enum insn_emulation_mode prev_mode = insn->current_mode; | |
214 | ||
215 | table->data = &insn->current_mode; | |
216 | ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
217 | ||
218 | if (ret || !write || prev_mode == insn->current_mode) | |
219 | goto ret; | |
220 | ||
221 | ret = update_insn_emulation_mode(insn, prev_mode); | |
90963395 | 222 | if (ret) { |
587064b6 PA |
223 | /* Mode change failed, revert to previous mode. */ |
224 | insn->current_mode = prev_mode; | |
225 | update_insn_emulation_mode(insn, INSN_UNDEF); | |
226 | } | |
227 | ret: | |
228 | table->data = insn; | |
229 | return ret; | |
230 | } | |
231 | ||
232 | static struct ctl_table ctl_abi[] = { | |
233 | { | |
234 | .procname = "abi", | |
235 | .mode = 0555, | |
236 | }, | |
237 | { } | |
238 | }; | |
239 | ||
240 | static void register_insn_emulation_sysctl(struct ctl_table *table) | |
241 | { | |
242 | unsigned long flags; | |
243 | int i = 0; | |
244 | struct insn_emulation *insn; | |
245 | struct ctl_table *insns_sysctl, *sysctl; | |
246 | ||
247 | insns_sysctl = kzalloc(sizeof(*sysctl) * (nr_insn_emulated + 1), | |
248 | GFP_KERNEL); | |
249 | ||
250 | raw_spin_lock_irqsave(&insn_emulation_lock, flags); | |
251 | list_for_each_entry(insn, &insn_emulation, node) { | |
252 | sysctl = &insns_sysctl[i]; | |
253 | ||
254 | sysctl->mode = 0644; | |
255 | sysctl->maxlen = sizeof(int); | |
256 | ||
257 | sysctl->procname = insn->ops->name; | |
258 | sysctl->data = insn; | |
259 | sysctl->extra1 = &insn->min; | |
260 | sysctl->extra2 = &insn->max; | |
261 | sysctl->proc_handler = emulation_proc_handler; | |
262 | i++; | |
263 | } | |
264 | raw_spin_unlock_irqrestore(&insn_emulation_lock, flags); | |
265 | ||
266 | table->child = insns_sysctl; | |
267 | register_sysctl_table(table); | |
268 | } | |
269 | ||
bd35a4ad PA |
270 | /* |
271 | * Implement emulation of the SWP/SWPB instructions using load-exclusive and | |
272 | * store-exclusive. | |
273 | * | |
274 | * Syntax of SWP{B} instruction: SWP{B}<c> <Rt>, <Rt2>, [<Rn>] | |
275 | * Where: Rt = destination | |
276 | * Rt2 = source | |
277 | * Rn = address | |
278 | */ | |
279 | ||
280 | /* | |
281 | * Error-checking SWP macros implemented using ldxr{b}/stxr{b} | |
282 | */ | |
283 | #define __user_swpX_asm(data, addr, res, temp, B) \ | |
284 | __asm__ __volatile__( \ | |
338d4f49 JM |
285 | ALTERNATIVE("nop", SET_PSTATE_PAN(0), ARM64_HAS_PAN, \ |
286 | CONFIG_ARM64_PAN) \ | |
bd35a4ad PA |
287 | " mov %w2, %w1\n" \ |
288 | "0: ldxr"B" %w1, [%3]\n" \ | |
289 | "1: stxr"B" %w0, %w2, [%3]\n" \ | |
290 | " cbz %w0, 2f\n" \ | |
291 | " mov %w0, %w4\n" \ | |
292 | "2:\n" \ | |
293 | " .pushsection .fixup,\"ax\"\n" \ | |
294 | " .align 2\n" \ | |
295 | "3: mov %w0, %w5\n" \ | |
296 | " b 2b\n" \ | |
297 | " .popsection" \ | |
298 | " .pushsection __ex_table,\"a\"\n" \ | |
299 | " .align 3\n" \ | |
300 | " .quad 0b, 3b\n" \ | |
301 | " .quad 1b, 3b\n" \ | |
338d4f49 JM |
302 | " .popsection\n" \ |
303 | ALTERNATIVE("nop", SET_PSTATE_PAN(1), ARM64_HAS_PAN, \ | |
304 | CONFIG_ARM64_PAN) \ | |
bd35a4ad PA |
305 | : "=&r" (res), "+r" (data), "=&r" (temp) \ |
306 | : "r" (addr), "i" (-EAGAIN), "i" (-EFAULT) \ | |
307 | : "memory") | |
308 | ||
309 | #define __user_swp_asm(data, addr, res, temp) \ | |
310 | __user_swpX_asm(data, addr, res, temp, "") | |
311 | #define __user_swpb_asm(data, addr, res, temp) \ | |
312 | __user_swpX_asm(data, addr, res, temp, "b") | |
313 | ||
314 | /* | |
315 | * Bit 22 of the instruction encoding distinguishes between | |
316 | * the SWP and SWPB variants (bit set means SWPB). | |
317 | */ | |
318 | #define TYPE_SWPB (1 << 22) | |
319 | ||
320 | /* | |
321 | * Set up process info to signal segmentation fault - called on access error. | |
322 | */ | |
323 | static void set_segfault(struct pt_regs *regs, unsigned long addr) | |
324 | { | |
325 | siginfo_t info; | |
326 | ||
327 | down_read(¤t->mm->mmap_sem); | |
328 | if (find_vma(current->mm, addr) == NULL) | |
329 | info.si_code = SEGV_MAPERR; | |
330 | else | |
331 | info.si_code = SEGV_ACCERR; | |
332 | up_read(¤t->mm->mmap_sem); | |
333 | ||
334 | info.si_signo = SIGSEGV; | |
335 | info.si_errno = 0; | |
336 | info.si_addr = (void *) instruction_pointer(regs); | |
337 | ||
338 | pr_debug("SWP{B} emulation: access caused memory abort!\n"); | |
339 | arm64_notify_die("Illegal memory access", regs, &info, 0); | |
340 | } | |
341 | ||
342 | static int emulate_swpX(unsigned int address, unsigned int *data, | |
343 | unsigned int type) | |
344 | { | |
345 | unsigned int res = 0; | |
346 | ||
347 | if ((type != TYPE_SWPB) && (address & 0x3)) { | |
348 | /* SWP to unaligned address not permitted */ | |
349 | pr_debug("SWP instruction on unaligned pointer!\n"); | |
350 | return -EFAULT; | |
351 | } | |
352 | ||
353 | while (1) { | |
354 | unsigned long temp; | |
355 | ||
356 | if (type == TYPE_SWPB) | |
357 | __user_swpb_asm(*data, address, res, temp); | |
358 | else | |
359 | __user_swp_asm(*data, address, res, temp); | |
360 | ||
361 | if (likely(res != -EAGAIN) || signal_pending(current)) | |
362 | break; | |
363 | ||
364 | cond_resched(); | |
365 | } | |
366 | ||
367 | return res; | |
368 | } | |
369 | ||
370 | /* | |
371 | * swp_handler logs the id of calling process, dissects the instruction, sanity | |
372 | * checks the memory location, calls emulate_swpX for the actual operation and | |
373 | * deals with fixup/error handling before returning | |
374 | */ | |
375 | static int swp_handler(struct pt_regs *regs, u32 instr) | |
376 | { | |
377 | u32 destreg, data, type, address = 0; | |
378 | int rn, rt2, res = 0; | |
379 | ||
380 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, regs->pc); | |
381 | ||
382 | type = instr & TYPE_SWPB; | |
383 | ||
384 | switch (arm_check_condition(instr, regs->pstate)) { | |
385 | case ARM_OPCODE_CONDTEST_PASS: | |
386 | break; | |
387 | case ARM_OPCODE_CONDTEST_FAIL: | |
388 | /* Condition failed - return to next instruction */ | |
389 | goto ret; | |
390 | case ARM_OPCODE_CONDTEST_UNCOND: | |
391 | /* If unconditional encoding - not a SWP, undef */ | |
392 | return -EFAULT; | |
393 | default: | |
394 | return -EINVAL; | |
395 | } | |
396 | ||
397 | rn = aarch32_insn_extract_reg_num(instr, A32_RN_OFFSET); | |
398 | rt2 = aarch32_insn_extract_reg_num(instr, A32_RT2_OFFSET); | |
399 | ||
400 | address = (u32)regs->user_regs.regs[rn]; | |
401 | data = (u32)regs->user_regs.regs[rt2]; | |
402 | destreg = aarch32_insn_extract_reg_num(instr, A32_RT_OFFSET); | |
403 | ||
404 | pr_debug("addr in r%d->0x%08x, dest is r%d, source in r%d->0x%08x)\n", | |
405 | rn, address, destreg, | |
406 | aarch32_insn_extract_reg_num(instr, A32_RT2_OFFSET), data); | |
407 | ||
408 | /* Check access in reasonable access range for both SWP and SWPB */ | |
409 | if (!access_ok(VERIFY_WRITE, (address & ~3), 4)) { | |
410 | pr_debug("SWP{B} emulation: access to 0x%08x not allowed!\n", | |
411 | address); | |
412 | goto fault; | |
413 | } | |
414 | ||
415 | res = emulate_swpX(address, &data, type); | |
416 | if (res == -EFAULT) | |
417 | goto fault; | |
418 | else if (res == 0) | |
419 | regs->user_regs.regs[destreg] = data; | |
420 | ||
421 | ret: | |
d784e298 PA |
422 | if (type == TYPE_SWPB) |
423 | trace_instruction_emulation("swpb", regs->pc); | |
424 | else | |
425 | trace_instruction_emulation("swp", regs->pc); | |
426 | ||
bd35a4ad PA |
427 | pr_warn_ratelimited("\"%s\" (%ld) uses obsolete SWP{B} instruction at 0x%llx\n", |
428 | current->comm, (unsigned long)current->pid, regs->pc); | |
429 | ||
430 | regs->pc += 4; | |
431 | return 0; | |
432 | ||
433 | fault: | |
434 | set_segfault(regs, address); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Only emulate SWP/SWPB executed in ARM state/User mode. | |
441 | * The kernel must be SWP free and SWP{B} does not exist in Thumb. | |
442 | */ | |
443 | static struct undef_hook swp_hooks[] = { | |
444 | { | |
445 | .instr_mask = 0x0fb00ff0, | |
446 | .instr_val = 0x01000090, | |
447 | .pstate_mask = COMPAT_PSR_MODE_MASK, | |
448 | .pstate_val = COMPAT_PSR_MODE_USR, | |
449 | .fn = swp_handler | |
450 | }, | |
451 | { } | |
452 | }; | |
453 | ||
454 | static struct insn_emulation_ops swp_ops = { | |
455 | .name = "swp", | |
456 | .status = INSN_OBSOLETE, | |
457 | .hooks = swp_hooks, | |
458 | .set_hw_mode = NULL, | |
459 | }; | |
460 | ||
c852f320 PA |
461 | static int cp15barrier_handler(struct pt_regs *regs, u32 instr) |
462 | { | |
463 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, regs->pc); | |
464 | ||
465 | switch (arm_check_condition(instr, regs->pstate)) { | |
466 | case ARM_OPCODE_CONDTEST_PASS: | |
467 | break; | |
468 | case ARM_OPCODE_CONDTEST_FAIL: | |
469 | /* Condition failed - return to next instruction */ | |
470 | goto ret; | |
471 | case ARM_OPCODE_CONDTEST_UNCOND: | |
472 | /* If unconditional encoding - not a barrier instruction */ | |
473 | return -EFAULT; | |
474 | default: | |
475 | return -EINVAL; | |
476 | } | |
477 | ||
478 | switch (aarch32_insn_mcr_extract_crm(instr)) { | |
479 | case 10: | |
480 | /* | |
481 | * dmb - mcr p15, 0, Rt, c7, c10, 5 | |
482 | * dsb - mcr p15, 0, Rt, c7, c10, 4 | |
483 | */ | |
d784e298 | 484 | if (aarch32_insn_mcr_extract_opc2(instr) == 5) { |
c852f320 | 485 | dmb(sy); |
d784e298 PA |
486 | trace_instruction_emulation( |
487 | "mcr p15, 0, Rt, c7, c10, 5 ; dmb", regs->pc); | |
488 | } else { | |
c852f320 | 489 | dsb(sy); |
d784e298 PA |
490 | trace_instruction_emulation( |
491 | "mcr p15, 0, Rt, c7, c10, 4 ; dsb", regs->pc); | |
492 | } | |
c852f320 PA |
493 | break; |
494 | case 5: | |
495 | /* | |
496 | * isb - mcr p15, 0, Rt, c7, c5, 4 | |
497 | * | |
498 | * Taking an exception or returning from one acts as an | |
499 | * instruction barrier. So no explicit barrier needed here. | |
500 | */ | |
d784e298 PA |
501 | trace_instruction_emulation( |
502 | "mcr p15, 0, Rt, c7, c5, 4 ; isb", regs->pc); | |
c852f320 PA |
503 | break; |
504 | } | |
505 | ||
506 | ret: | |
507 | pr_warn_ratelimited("\"%s\" (%ld) uses deprecated CP15 Barrier instruction at 0x%llx\n", | |
508 | current->comm, (unsigned long)current->pid, regs->pc); | |
509 | ||
510 | regs->pc += 4; | |
511 | return 0; | |
512 | } | |
513 | ||
c852f320 PA |
514 | static int cp15_barrier_set_hw_mode(bool enable) |
515 | { | |
736d474f SP |
516 | if (enable) |
517 | config_sctlr_el1(0, SCTLR_EL1_CP15BEN); | |
518 | else | |
519 | config_sctlr_el1(SCTLR_EL1_CP15BEN, 0); | |
520 | return 0; | |
c852f320 PA |
521 | } |
522 | ||
523 | static struct undef_hook cp15_barrier_hooks[] = { | |
524 | { | |
525 | .instr_mask = 0x0fff0fdf, | |
526 | .instr_val = 0x0e070f9a, | |
527 | .pstate_mask = COMPAT_PSR_MODE_MASK, | |
528 | .pstate_val = COMPAT_PSR_MODE_USR, | |
529 | .fn = cp15barrier_handler, | |
530 | }, | |
531 | { | |
532 | .instr_mask = 0x0fff0fff, | |
533 | .instr_val = 0x0e070f95, | |
534 | .pstate_mask = COMPAT_PSR_MODE_MASK, | |
535 | .pstate_val = COMPAT_PSR_MODE_USR, | |
536 | .fn = cp15barrier_handler, | |
537 | }, | |
538 | { } | |
539 | }; | |
540 | ||
541 | static struct insn_emulation_ops cp15_barrier_ops = { | |
542 | .name = "cp15_barrier", | |
543 | .status = INSN_DEPRECATED, | |
544 | .hooks = cp15_barrier_hooks, | |
545 | .set_hw_mode = cp15_barrier_set_hw_mode, | |
546 | }; | |
547 | ||
2d888f48 SP |
548 | static int setend_set_hw_mode(bool enable) |
549 | { | |
550 | if (!cpu_supports_mixed_endian_el0()) | |
551 | return -EINVAL; | |
552 | ||
553 | if (enable) | |
554 | config_sctlr_el1(SCTLR_EL1_SED, 0); | |
555 | else | |
556 | config_sctlr_el1(0, SCTLR_EL1_SED); | |
557 | return 0; | |
558 | } | |
559 | ||
560 | static int compat_setend_handler(struct pt_regs *regs, u32 big_endian) | |
561 | { | |
562 | char *insn; | |
563 | ||
564 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, regs->pc); | |
565 | ||
566 | if (big_endian) { | |
567 | insn = "setend be"; | |
568 | regs->pstate |= COMPAT_PSR_E_BIT; | |
569 | } else { | |
570 | insn = "setend le"; | |
571 | regs->pstate &= ~COMPAT_PSR_E_BIT; | |
572 | } | |
573 | ||
574 | trace_instruction_emulation(insn, regs->pc); | |
575 | pr_warn_ratelimited("\"%s\" (%ld) uses deprecated setend instruction at 0x%llx\n", | |
576 | current->comm, (unsigned long)current->pid, regs->pc); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static int a32_setend_handler(struct pt_regs *regs, u32 instr) | |
582 | { | |
583 | int rc = compat_setend_handler(regs, (instr >> 9) & 1); | |
584 | regs->pc += 4; | |
585 | return rc; | |
586 | } | |
587 | ||
588 | static int t16_setend_handler(struct pt_regs *regs, u32 instr) | |
589 | { | |
590 | int rc = compat_setend_handler(regs, (instr >> 3) & 1); | |
591 | regs->pc += 2; | |
592 | return rc; | |
593 | } | |
594 | ||
595 | static struct undef_hook setend_hooks[] = { | |
596 | { | |
597 | .instr_mask = 0xfffffdff, | |
598 | .instr_val = 0xf1010000, | |
599 | .pstate_mask = COMPAT_PSR_MODE_MASK, | |
600 | .pstate_val = COMPAT_PSR_MODE_USR, | |
601 | .fn = a32_setend_handler, | |
602 | }, | |
603 | { | |
604 | /* Thumb mode */ | |
605 | .instr_mask = 0x0000fff7, | |
606 | .instr_val = 0x0000b650, | |
607 | .pstate_mask = (COMPAT_PSR_T_BIT | COMPAT_PSR_MODE_MASK), | |
608 | .pstate_val = (COMPAT_PSR_T_BIT | COMPAT_PSR_MODE_USR), | |
609 | .fn = t16_setend_handler, | |
610 | }, | |
611 | {} | |
612 | }; | |
613 | ||
614 | static struct insn_emulation_ops setend_ops = { | |
615 | .name = "setend", | |
616 | .status = INSN_DEPRECATED, | |
617 | .hooks = setend_hooks, | |
618 | .set_hw_mode = setend_set_hw_mode, | |
619 | }; | |
620 | ||
736d474f SP |
621 | static int insn_cpu_hotplug_notify(struct notifier_block *b, |
622 | unsigned long action, void *hcpu) | |
623 | { | |
624 | int rc = 0; | |
625 | if ((action & ~CPU_TASKS_FROZEN) == CPU_STARTING) | |
626 | rc = run_all_insn_set_hw_mode((unsigned long)hcpu); | |
627 | ||
628 | return notifier_from_errno(rc); | |
629 | } | |
630 | ||
631 | static struct notifier_block insn_cpu_hotplug_notifier = { | |
632 | .notifier_call = insn_cpu_hotplug_notify, | |
633 | }; | |
634 | ||
587064b6 PA |
635 | /* |
636 | * Invoked as late_initcall, since not needed before init spawned. | |
637 | */ | |
638 | static int __init armv8_deprecated_init(void) | |
639 | { | |
bd35a4ad PA |
640 | if (IS_ENABLED(CONFIG_SWP_EMULATION)) |
641 | register_insn_emulation(&swp_ops); | |
642 | ||
c852f320 PA |
643 | if (IS_ENABLED(CONFIG_CP15_BARRIER_EMULATION)) |
644 | register_insn_emulation(&cp15_barrier_ops); | |
645 | ||
2d888f48 SP |
646 | if (IS_ENABLED(CONFIG_SETEND_EMULATION)) { |
647 | if(system_supports_mixed_endian_el0()) | |
648 | register_insn_emulation(&setend_ops); | |
649 | else | |
650 | pr_info("setend instruction emulation is not supported on the system"); | |
651 | } | |
652 | ||
736d474f | 653 | register_cpu_notifier(&insn_cpu_hotplug_notifier); |
587064b6 PA |
654 | register_insn_emulation_sysctl(ctl_abi); |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | late_initcall(armv8_deprecated_init); |