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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6 
 kernel/arch/arm64/kernel/traps.c
....@@ -1,26 +1,17 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Based on arch/arm/kernel/traps.c
34  *
45  * Copyright (C) 1995-2009 Russell King
56  * Copyright (C) 2012 ARM Ltd.
6
- *
7
- * This program is free software; you can redistribute it and/or modify
8
- * it under the terms of the GNU General Public License version 2 as
9
- * published by the Free Software Foundation.
10
- *
11
- * This program is distributed in the hope that it will be useful,
12
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- * GNU General Public License for more details.
15
- *
16
- * You should have received a copy of the GNU General Public License
17
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
187  */
198 
209 #include <linux/bug.h>
10
+#include <linux/context_tracking.h>
2111 #include <linux/signal.h>
2212 #include <linux/personality.h>
2313 #include <linux/kallsyms.h>
14
+#include <linux/kprobes.h>
2415 #include <linux/spinlock.h>
2516 #include <linux/uaccess.h>
2617 #include <linux/hardirq.h>
....@@ -43,7 +34,10 @@
4334 #include <asm/daifflags.h>
4435 #include <asm/debug-monitors.h>
4536 #include <asm/esr.h>
37
+#include <asm/exception.h>
38
+#include <asm/extable.h>
4639 #include <asm/insn.h>
40
+#include <asm/kprobes.h>
4741 #include <asm/traps.h>
4842 #include <asm/smp.h>
4943 #include <asm/stack_pointer.h>
....@@ -51,6 +45,12 @@
5145 #include <asm/exception.h>
5246 #include <asm/system_misc.h>
5347 #include <asm/sysreg.h>
48
+
49
+#include <trace/hooks/traps.h>
50
+
51
+#if IS_ENABLED(CONFIG_ROCKCHIP_MINIDUMP)
52
+#include <soc/rockchip/rk_minidump.h>
53
+#endif
5454 
5555 static const char *handler[]= {
5656 	"Synchronous Abort",
....@@ -61,21 +61,19 @@
6161 
6262 int show_unhandled_signals = 0;
6363 
64
-static void dump_backtrace_entry(unsigned long where)
65
-{
66
-	printk(" %pS\n", (void *)where);
67
-}
68
-
69
-static void __dump_instr(const char *lvl, struct pt_regs *regs)
64
+static void dump_kernel_instr(const char *lvl, struct pt_regs *regs)
7065 {
7166 	unsigned long addr = instruction_pointer(regs);
7267 	char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
7368 	int i;
7469 
70
+	if (user_mode(regs))
71
+		return;
72
+
7573 	for (i = -4; i < 1; i++) {
7674 		unsigned int val, bad;
7775 
78
-		bad = get_user(val, &((u32 *)addr)[i]);
76
+		bad = aarch64_insn_read(&((u32 *)addr)[i], &val);
7977 
8078 		if (!bad)
8179 			p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
....@@ -84,91 +82,22 @@
8482 			break;
8583 		}
8684 	}
85
+
8786 	printk("%sCode: %s\n", lvl, str);
88
-}
89
-
90
-static void dump_instr(const char *lvl, struct pt_regs *regs)
91
-{
92
-	if (!user_mode(regs)) {
93
-		mm_segment_t fs = get_fs();
94
-		set_fs(KERNEL_DS);
95
-		__dump_instr(lvl, regs);
96
-		set_fs(fs);
97
-	} else {
98
-		__dump_instr(lvl, regs);
99
-	}
100
-}
101
-
102
-void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
103
-{
104
-	struct stackframe frame;
105
-	int skip = 0;
106
-
107
-	pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
108
-
109
-	if (regs) {
110
-		if (user_mode(regs))
111
-			return;
112
-		skip = 1;
113
-	}
114
-
115
-	if (!tsk)
116
-		tsk = current;
117
-
118
-	if (!try_get_task_stack(tsk))
119
-		return;
120
-
121
-	if (tsk == current) {
122
-		frame.fp = (unsigned long)__builtin_frame_address(0);
123
-		frame.pc = (unsigned long)dump_backtrace;
124
-	} else {
125
-		/*
126
-		 * task blocked in __switch_to
127
-		 */
128
-		frame.fp = thread_saved_fp(tsk);
129
-		frame.pc = thread_saved_pc(tsk);
130
-	}
131
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
132
-	frame.graph = tsk->curr_ret_stack;
133
-#endif
134
-
135
-	printk("Call trace:\n");
136
-	do {
137
-		/* skip until specified stack frame */
138
-		if (!skip) {
139
-			dump_backtrace_entry(frame.pc);
140
-		} else if (frame.fp == regs->regs[29]) {
141
-			skip = 0;
142
-			/*
143
-			 * Mostly, this is the case where this function is
144
-			 * called in panic/abort. As exception handler's
145
-			 * stack frame does not contain the corresponding pc
146
-			 * at which an exception has taken place, use regs->pc
147
-			 * instead.
148
-			 */
149
-			dump_backtrace_entry(regs->pc);
150
-		}
151
-	} while (!unwind_frame(tsk, &frame));
152
-
153
-	put_task_stack(tsk);
154
-}
155
-
156
-void show_stack(struct task_struct *tsk, unsigned long *sp)
157
-{
158
-	dump_backtrace(NULL, tsk);
159
-	barrier();
16087 }
16188 
16289 #ifdef CONFIG_PREEMPT
16390 #define S_PREEMPT " PREEMPT"
91
+#elif defined(CONFIG_PREEMPT_RT)
92
+#define S_PREEMPT " PREEMPT_RT"
16493 #else
16594 #define S_PREEMPT ""
16695 #endif
96
+
16797 #define S_SMP " SMP"
16898 
16999 static int __die(const char *str, int err, struct pt_regs *regs)
170100 {
171
-	struct task_struct *tsk = current;
172101 	static int die_counter;
173102 	int ret;
174103 
....@@ -181,13 +110,9 @@
181110 		return ret;
182111 
183112 	print_modules();
184
-	pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
185
-		 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk),
186
-		 end_of_stack(tsk));
187113 	show_regs(regs);
188114 
189
-	if (!user_mode(regs))
190
-		dump_instr(KERN_EMERG, regs);
115
+	dump_kernel_instr(KERN_EMERG, regs);
191116 
192117 	return ret;
193118 }
....@@ -202,6 +127,9 @@
202127 	int ret;
203128 	unsigned long flags;
204129 
130
+#if IS_ENABLED(CONFIG_ROCKCHIP_MINIDUMP)
131
+	rk_minidump_update_cpu_regs(regs);
132
+#endif
205133 	raw_spin_lock_irqsave(&die_lock, flags);
206134 
207135 	oops_enter();
....@@ -218,34 +146,29 @@
218146 	oops_exit();
219147 
220148 	if (in_interrupt())
221
-		panic("Fatal exception in interrupt");
149
+		panic("%s: Fatal exception in interrupt", str);
222150 	if (panic_on_oops)
223
-		panic("Fatal exception");
151
+		panic("%s: Fatal exception", str);
224152 
225153 	raw_spin_unlock_irqrestore(&die_lock, flags);
226154 
227155 	if (ret != NOTIFY_STOP)
228
-		do_exit(SIGSEGV);
156
+		make_task_dead(SIGSEGV);
229157 }
230158 
231
-static bool show_unhandled_signals_ratelimited(void)
159
+static void arm64_show_signal(int signo, const char *str)
232160 {
233161 	static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
234162 				      DEFAULT_RATELIMIT_BURST);
235
-	return show_unhandled_signals && __ratelimit(&rs);
236
-}
237
-
238
-void arm64_force_sig_info(struct siginfo *info, const char *str,
239
-			  struct task_struct *tsk)
240
-{
163
+	struct task_struct *tsk = current;
241164 	unsigned int esr = tsk->thread.fault_code;
242165 	struct pt_regs *regs = task_pt_regs(tsk);
243166 
244
-	if (!unhandled_signal(tsk, info->si_signo))
245
-		goto send_sig;
246
-
247
-	if (!show_unhandled_signals_ratelimited())
248
-		goto send_sig;
167
+	/* Leave if the signal won't be shown */
168
+	if (!show_unhandled_signals ||
169
+	    !unhandled_signal(tsk, signo) ||
170
+	    !__ratelimit(&rs))
171
+		return;
249172 
250173 	pr_info("%s[%d]: unhandled exception: ", tsk->comm, task_pid_nr(tsk));
251174 	if (esr)
....@@ -255,23 +178,101 @@
255178 	print_vma_addr(KERN_CONT " in ", regs->pc);
256179 	pr_cont("\n");
257180 	__show_regs(regs);
181
+}
258182 
259
-send_sig:
260
-	force_sig_info(info->si_signo, info, tsk);
183
+void arm64_force_sig_fault(int signo, int code, unsigned long far,
184
+			   const char *str)
185
+{
186
+	arm64_show_signal(signo, str);
187
+	if (signo == SIGKILL)
188
+		force_sig(SIGKILL);
189
+	else
190
+		force_sig_fault(signo, code, (void __user *)far);
191
+}
192
+
193
+void arm64_force_sig_mceerr(int code, unsigned long far, short lsb,
194
+			    const char *str)
195
+{
196
+	arm64_show_signal(SIGBUS, str);
197
+	force_sig_mceerr(code, (void __user *)far, lsb);
198
+}
199
+
200
+void arm64_force_sig_ptrace_errno_trap(int errno, unsigned long far,
201
+				       const char *str)
202
+{
203
+	arm64_show_signal(SIGTRAP, str);
204
+	force_sig_ptrace_errno_trap(errno, (void __user *)far);
261205 }
262206 
263207 void arm64_notify_die(const char *str, struct pt_regs *regs,
264
-		      struct siginfo *info, int err)
208
+		      int signo, int sicode, unsigned long far,
209
+		      int err)
265210 {
266211 	if (user_mode(regs)) {
267212 		WARN_ON(regs != current_pt_regs());
268213 		current->thread.fault_address = 0;
269214 		current->thread.fault_code = err;
270
-		arm64_force_sig_info(info, str, current);
215
+
216
+		arm64_force_sig_fault(signo, sicode, far, str);
271217 	} else {
272218 		die(str, regs, err);
273219 	}
274220 }
221
+
222
+#ifdef CONFIG_COMPAT
223
+#define PSTATE_IT_1_0_SHIFT	25
224
+#define PSTATE_IT_1_0_MASK	(0x3 << PSTATE_IT_1_0_SHIFT)
225
+#define PSTATE_IT_7_2_SHIFT	10
226
+#define PSTATE_IT_7_2_MASK	(0x3f << PSTATE_IT_7_2_SHIFT)
227
+
228
+static u32 compat_get_it_state(struct pt_regs *regs)
229
+{
230
+	u32 it, pstate = regs->pstate;
231
+
232
+	it  = (pstate & PSTATE_IT_1_0_MASK) >> PSTATE_IT_1_0_SHIFT;
233
+	it |= ((pstate & PSTATE_IT_7_2_MASK) >> PSTATE_IT_7_2_SHIFT) << 2;
234
+
235
+	return it;
236
+}
237
+
238
+static void compat_set_it_state(struct pt_regs *regs, u32 it)
239
+{
240
+	u32 pstate_it;
241
+
242
+	pstate_it  = (it << PSTATE_IT_1_0_SHIFT) & PSTATE_IT_1_0_MASK;
243
+	pstate_it |= ((it >> 2) << PSTATE_IT_7_2_SHIFT) & PSTATE_IT_7_2_MASK;
244
+
245
+	regs->pstate &= ~PSR_AA32_IT_MASK;
246
+	regs->pstate |= pstate_it;
247
+}
248
+
249
+static void advance_itstate(struct pt_regs *regs)
250
+{
251
+	u32 it;
252
+
253
+	/* ARM mode */
254
+	if (!(regs->pstate & PSR_AA32_T_BIT) ||
255
+	    !(regs->pstate & PSR_AA32_IT_MASK))
256
+		return;
257
+
258
+	it  = compat_get_it_state(regs);
259
+
260
+	/*
261
+	 * If this is the last instruction of the block, wipe the IT
262
+	 * state. Otherwise advance it.
263
+	 */
264
+	if (!(it & 7))
265
+		it = 0;
266
+	else
267
+		it = (it & 0xe0) | ((it << 1) & 0x1f);
268
+
269
+	compat_set_it_state(regs, it);
270
+}
271
+#else
272
+static void advance_itstate(struct pt_regs *regs)
273
+{
274
+}
275
+#endif
275276 
276277 void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size)
277278 {
....@@ -283,6 +284,11 @@
283284 	 */
284285 	if (user_mode(regs))
285286 		user_fastforward_single_step(current);
287
+
288
+	if (compat_user_mode(regs))
289
+		advance_itstate(regs);
290
+	else
291
+		regs->pstate &= ~PSR_BTYPE_MASK;
286292 }
287293 
288294 static LIST_HEAD(undef_hook);
....@@ -316,7 +322,7 @@
316322 
317323 	if (!user_mode(regs)) {
318324 		__le32 instr_le;
319
-		if (probe_kernel_address((__force __le32 *)pc, instr_le))
325
+		if (get_kernel_nofault(instr_le, (__force __le32 *)pc))
320326 			goto exit;
321327 		instr = le32_to_cpu(instr_le);
322328 	} else if (compat_thumb_mode(regs)) {
....@@ -352,13 +358,13 @@
352358 	return fn ? fn(regs, instr) : 1;
353359 }
354360 
355
-void force_signal_inject(int signal, int code, unsigned long address)
361
+void force_signal_inject(int signal, int code, unsigned long address, unsigned int err)
356362 {
357
-	siginfo_t info;
358363 	const char *desc;
359364 	struct pt_regs *regs = current_pt_regs();
360365 
361
-	clear_siginfo(&info);
366
+	if (WARN_ON(!user_mode(regs)))
367
+		return;
362368 
363369 	switch (signal) {
364370 	case SIGILL:
....@@ -378,12 +384,7 @@
378384 		signal = SIGKILL;
379385 	}
380386 
381
-	info.si_signo = signal;
382
-	info.si_errno = 0;
383
-	info.si_code  = code;
384
-	info.si_addr  = (void __user *)address;
385
-
386
-	arm64_notify_die(desc, regs, &info, 0);
387
+	arm64_notify_die(desc, regs, signal, code, address, err);
387388 }
388389 
389390 /*
....@@ -393,17 +394,17 @@
393394 {
394395 	int code;
395396 
396
-	down_read(&current->mm->mmap_sem);
397
-	if (find_vma(current->mm, addr) == NULL)
397
+	mmap_read_lock(current->mm);
398
+	if (find_vma(current->mm, untagged_addr(addr)) == NULL)
398399 		code = SEGV_MAPERR;
399400 	else
400401 		code = SEGV_ACCERR;
401
-	up_read(&current->mm->mmap_sem);
402
+	mmap_read_unlock(current->mm);
402403 
403
-	force_signal_inject(SIGSEGV, code, addr);
404
+	force_signal_inject(SIGSEGV, code, addr, 0);
404405 }
405406 
406
-asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
407
+void do_undefinstr(struct pt_regs *regs)
407408 {
408409 	/* check for AArch32 breakpoint instructions */
409410 	if (!aarch32_break_handler(regs))
....@@ -412,14 +413,30 @@
412413 	if (call_undef_hook(regs) == 0)
413414 		return;
414415 
415
-	force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
416
+	trace_android_rvh_do_undefinstr(regs, user_mode(regs));
416417 	BUG_ON(!user_mode(regs));
418
+	force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
417419 }
420
+NOKPROBE_SYMBOL(do_undefinstr);
418421 
419
-void cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused)
422
+void do_bti(struct pt_regs *regs)
420423 {
421
-	sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCI, 0);
424
+	BUG_ON(!user_mode(regs));
425
+	force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
422426 }
427
+NOKPROBE_SYMBOL(do_bti);
428
+
429
+void do_ptrauth_fault(struct pt_regs *regs, unsigned int esr)
430
+{
431
+	/*
432
+	 * Unexpected FPAC exception or pointer authentication failure in
433
+	 * the kernel: kill the task before it does any more harm.
434
+	 */
435
+	trace_android_rvh_do_ptrauth_fault(regs, esr, user_mode(regs));
436
+	BUG_ON(!user_mode(regs));
437
+	force_signal_inject(SIGILL, ILL_ILLOPN, regs->pc, esr);
438
+}
439
+NOKPROBE_SYMBOL(do_ptrauth_fault);
423440 
424441 #define __user_cache_maint(insn, address, res)			\
425442 	if (address >= user_addr_max()) {			\
....@@ -443,12 +460,13 @@
443460 
444461 static void user_cache_maint_handler(unsigned int esr, struct pt_regs *regs)
445462 {
446
-	unsigned long address;
447
-	int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
463
+	unsigned long tagged_address, address;
464
+	int rt = ESR_ELx_SYS64_ISS_RT(esr);
448465 	int crm = (esr & ESR_ELx_SYS64_ISS_CRM_MASK) >> ESR_ELx_SYS64_ISS_CRM_SHIFT;
449466 	int ret = 0;
450467 
451
-	address = untagged_addr(pt_regs_read_reg(regs, rt));
468
+	tagged_address = pt_regs_read_reg(regs, rt);
469
+	address = untagged_addr(tagged_address);
452470 
453471 	switch (crm) {
454472 	case ESR_ELx_SYS64_ISS_CRM_DC_CVAU:	/* DC CVAU, gets promoted */
....@@ -456,6 +474,9 @@
456474 		break;
457475 	case ESR_ELx_SYS64_ISS_CRM_DC_CVAC:	/* DC CVAC, gets promoted */
458476 		__user_cache_maint("dc civac", address, ret);
477
+		break;
478
+	case ESR_ELx_SYS64_ISS_CRM_DC_CVADP:	/* DC CVADP */
479
+		__user_cache_maint("sys 3, c7, c13, 1", address, ret);
459480 		break;
460481 	case ESR_ELx_SYS64_ISS_CRM_DC_CVAP:	/* DC CVAP */
461482 		__user_cache_maint("sys 3, c7, c12, 1", address, ret);
....@@ -467,19 +488,19 @@
467488 		__user_cache_maint("ic ivau", address, ret);
468489 		break;
469490 	default:
470
-		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
491
+		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
471492 		return;
472493 	}
473494 
474495 	if (ret)
475
-		arm64_notify_segfault(address);
496
+		arm64_notify_segfault(tagged_address);
476497 	else
477498 		arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
478499 }
479500 
480501 static void ctr_read_handler(unsigned int esr, struct pt_regs *regs)
481502 {
482
-	int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
503
+	int rt = ESR_ELx_SYS64_ISS_RT(esr);
483504 	unsigned long val = arm64_ftr_reg_user_value(&arm64_ftr_reg_ctrel0);
484505 
485506 	if (cpus_have_const_cap(ARM64_WORKAROUND_1542419)) {
....@@ -498,17 +519,33 @@
498519 
499520 static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs)
500521 {
501
-	int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
522
+	int rt = ESR_ELx_SYS64_ISS_RT(esr);
502523 
503
-	pt_regs_write_reg(regs, rt, arch_counter_get_cntvct());
524
+	pt_regs_write_reg(regs, rt, arch_timer_read_counter());
504525 	arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
505526 }
506527 
507528 static void cntfrq_read_handler(unsigned int esr, struct pt_regs *regs)
508529 {
509
-	int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
530
+	int rt = ESR_ELx_SYS64_ISS_RT(esr);
510531 
511532 	pt_regs_write_reg(regs, rt, arch_timer_get_rate());
533
+	arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
534
+}
535
+
536
+static void mrs_handler(unsigned int esr, struct pt_regs *regs)
537
+{
538
+	u32 sysreg, rt;
539
+
540
+	rt = ESR_ELx_SYS64_ISS_RT(esr);
541
+	sysreg = esr_sys64_to_sysreg(esr);
542
+
543
+	if (do_emulate_mrs(regs, sysreg, rt) != 0)
544
+		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
545
+}
546
+
547
+static void wfi_handler(unsigned int esr, struct pt_regs *regs)
548
+{
512549 	arm64_skip_faulting_instruction(regs, AARCH64_INSN_SIZE);
513550 }
514551 
....@@ -518,7 +555,7 @@
518555 	void (*handler)(unsigned int esr, struct pt_regs *regs);
519556 };
520557 
521
-static struct sys64_hook sys64_hooks[] = {
558
+static const struct sys64_hook sys64_hooks[] = {
522559 	{
523560 		.esr_mask = ESR_ELx_SYS64_ISS_EL0_CACHE_OP_MASK,
524561 		.esr_val = ESR_ELx_SYS64_ISS_EL0_CACHE_OP_VAL,
....@@ -542,12 +579,123 @@
542579 		.esr_val = ESR_ELx_SYS64_ISS_SYS_CNTFRQ,
543580 		.handler = cntfrq_read_handler,
544581 	},
582
+	{
583
+		/* Trap read access to CPUID registers */
584
+		.esr_mask = ESR_ELx_SYS64_ISS_SYS_MRS_OP_MASK,
585
+		.esr_val = ESR_ELx_SYS64_ISS_SYS_MRS_OP_VAL,
586
+		.handler = mrs_handler,
587
+	},
588
+	{
589
+		/* Trap WFI instructions executed in userspace */
590
+		.esr_mask = ESR_ELx_WFx_MASK,
591
+		.esr_val = ESR_ELx_WFx_WFI_VAL,
592
+		.handler = wfi_handler,
593
+	},
545594 	{},
546595 };
547596 
548
-asmlinkage void __exception do_sysinstr(unsigned int esr, struct pt_regs *regs)
597
+#ifdef CONFIG_COMPAT
598
+static bool cp15_cond_valid(unsigned int esr, struct pt_regs *regs)
549599 {
550
-	struct sys64_hook *hook;
600
+	int cond;
601
+
602
+	/* Only a T32 instruction can trap without CV being set */
603
+	if (!(esr & ESR_ELx_CV)) {
604
+		u32 it;
605
+
606
+		it = compat_get_it_state(regs);
607
+		if (!it)
608
+			return true;
609
+
610
+		cond = it >> 4;
611
+	} else {
612
+		cond = (esr & ESR_ELx_COND_MASK) >> ESR_ELx_COND_SHIFT;
613
+	}
614
+
615
+	return aarch32_opcode_cond_checks[cond](regs->pstate);
616
+}
617
+
618
+static void compat_cntfrq_read_handler(unsigned int esr, struct pt_regs *regs)
619
+{
620
+	int reg = (esr & ESR_ELx_CP15_32_ISS_RT_MASK) >> ESR_ELx_CP15_32_ISS_RT_SHIFT;
621
+
622
+	pt_regs_write_reg(regs, reg, arch_timer_get_rate());
623
+	arm64_skip_faulting_instruction(regs, 4);
624
+}
625
+
626
+static const struct sys64_hook cp15_32_hooks[] = {
627
+	{
628
+		.esr_mask = ESR_ELx_CP15_32_ISS_SYS_MASK,
629
+		.esr_val = ESR_ELx_CP15_32_ISS_SYS_CNTFRQ,
630
+		.handler = compat_cntfrq_read_handler,
631
+	},
632
+	{},
633
+};
634
+
635
+static void compat_cntvct_read_handler(unsigned int esr, struct pt_regs *regs)
636
+{
637
+	int rt = (esr & ESR_ELx_CP15_64_ISS_RT_MASK) >> ESR_ELx_CP15_64_ISS_RT_SHIFT;
638
+	int rt2 = (esr & ESR_ELx_CP15_64_ISS_RT2_MASK) >> ESR_ELx_CP15_64_ISS_RT2_SHIFT;
639
+	u64 val = arch_timer_read_counter();
640
+
641
+	pt_regs_write_reg(regs, rt, lower_32_bits(val));
642
+	pt_regs_write_reg(regs, rt2, upper_32_bits(val));
643
+	arm64_skip_faulting_instruction(regs, 4);
644
+}
645
+
646
+static const struct sys64_hook cp15_64_hooks[] = {
647
+	{
648
+		.esr_mask = ESR_ELx_CP15_64_ISS_SYS_MASK,
649
+		.esr_val = ESR_ELx_CP15_64_ISS_SYS_CNTVCT,
650
+		.handler = compat_cntvct_read_handler,
651
+	},
652
+	{},
653
+};
654
+
655
+void do_cp15instr(unsigned int esr, struct pt_regs *regs)
656
+{
657
+	const struct sys64_hook *hook, *hook_base;
658
+
659
+	if (!cp15_cond_valid(esr, regs)) {
660
+		/*
661
+		 * There is no T16 variant of a CP access, so we
662
+		 * always advance PC by 4 bytes.
663
+		 */
664
+		arm64_skip_faulting_instruction(regs, 4);
665
+		return;
666
+	}
667
+
668
+	switch (ESR_ELx_EC(esr)) {
669
+	case ESR_ELx_EC_CP15_32:
670
+		hook_base = cp15_32_hooks;
671
+		break;
672
+	case ESR_ELx_EC_CP15_64:
673
+		hook_base = cp15_64_hooks;
674
+		break;
675
+	default:
676
+		do_undefinstr(regs);
677
+		return;
678
+	}
679
+
680
+	for (hook = hook_base; hook->handler; hook++)
681
+		if ((hook->esr_mask & esr) == hook->esr_val) {
682
+			hook->handler(esr, regs);
683
+			return;
684
+		}
685
+
686
+	/*
687
+	 * New cp15 instructions may previously have been undefined at
688
+	 * EL0. Fall back to our usual undefined instruction handler
689
+	 * so that we handle these consistently.
690
+	 */
691
+	do_undefinstr(regs);
692
+}
693
+NOKPROBE_SYMBOL(do_cp15instr);
694
+#endif
695
+
696
+void do_sysinstr(unsigned int esr, struct pt_regs *regs)
697
+{
698
+	const struct sys64_hook *hook;
551699 
552700 	for (hook = sys64_hooks; hook->handler; hook++)
553701 		if ((hook->esr_mask & esr) == hook->esr_val) {
....@@ -562,6 +710,7 @@
562710 	 */
563711 	do_undefinstr(regs);
564712 }
713
+NOKPROBE_SYMBOL(do_sysinstr);
565714 
566715 static const char *esr_class_str[] = {
567716 	[0 ... ESR_ELx_EC_MAX]		= "UNRECOGNIZED EC",
....@@ -573,7 +722,9 @@
573722 	[ESR_ELx_EC_CP14_LS]		= "CP14 LDC/STC",
574723 	[ESR_ELx_EC_FP_ASIMD]		= "ASIMD",
575724 	[ESR_ELx_EC_CP10_ID]		= "CP10 MRC/VMRS",
725
+	[ESR_ELx_EC_PAC]		= "PAC",
576726 	[ESR_ELx_EC_CP14_64]		= "CP14 MCRR/MRRC",
727
+	[ESR_ELx_EC_BTI]		= "BTI",
577728 	[ESR_ELx_EC_ILL]		= "PSTATE.IL",
578729 	[ESR_ELx_EC_SVC32]		= "SVC (AArch32)",
579730 	[ESR_ELx_EC_HVC32]		= "HVC (AArch32)",
....@@ -583,6 +734,8 @@
583734 	[ESR_ELx_EC_SMC64]		= "SMC (AArch64)",
584735 	[ESR_ELx_EC_SYS64]		= "MSR/MRS (AArch64)",
585736 	[ESR_ELx_EC_SVE]		= "SVE",
737
+	[ESR_ELx_EC_ERET]		= "ERET/ERETAA/ERETAB",
738
+	[ESR_ELx_EC_FPAC]		= "FPAC",
586739 	[ESR_ELx_EC_IMP_DEF]		= "EL3 IMP DEF",
587740 	[ESR_ELx_EC_IABT_LOW]		= "IABT (lower EL)",
588741 	[ESR_ELx_EC_IABT_CUR]		= "IABT (current EL)",
....@@ -613,14 +766,18 @@
613766  * bad_mode handles the impossible case in the exception vector. This is always
614767  * fatal.
615768  */
616
-asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
769
+asmlinkage void notrace bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
617770 {
771
+	arm64_enter_nmi(regs);
772
+
618773 	console_verbose();
619774 
620775 	pr_crit("Bad mode in %s handler detected on CPU%d, code 0x%08x -- %s\n",
621776 		handler[reason], smp_processor_id(), esr,
622777 		esr_get_class_string(esr));
623778 
779
+	trace_android_rvh_bad_mode(regs, esr, reason);
780
+	__show_regs(regs);
624781 	local_daif_mask();
625782 	panic("bad mode");
626783 }
....@@ -629,21 +786,15 @@
629786  * bad_el0_sync handles unexpected, but potentially recoverable synchronous
630787  * exceptions taken from EL0. Unlike bad_mode, this returns.
631788  */
632
-asmlinkage void bad_el0_sync(struct pt_regs *regs, int reason, unsigned int esr)
789
+void bad_el0_sync(struct pt_regs *regs, int reason, unsigned int esr)
633790 {
634
-	siginfo_t info;
635
-	void __user *pc = (void __user *)instruction_pointer(regs);
636
-
637
-	clear_siginfo(&info);
638
-	info.si_signo = SIGILL;
639
-	info.si_errno = 0;
640
-	info.si_code  = ILL_ILLOPC;
641
-	info.si_addr  = pc;
791
+	unsigned long pc = instruction_pointer(regs);
642792 
643793 	current->thread.fault_address = 0;
644794 	current->thread.fault_code = esr;
645795 
646
-	arm64_force_sig_info(&info, "Bad EL0 synchronous exception", current);
796
+	arm64_force_sig_fault(SIGILL, ILL_ILLOPC, pc,
797
+			      "Bad EL0 synchronous exception");
647798 }
648799 
649800 #ifdef CONFIG_VMAP_STACK
....@@ -651,13 +802,15 @@
651802 DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack)
652803 	__aligned(16);
653804 
654
-asmlinkage void handle_bad_stack(struct pt_regs *regs)
805
+asmlinkage void noinstr handle_bad_stack(struct pt_regs *regs)
655806 {
656807 	unsigned long tsk_stk = (unsigned long)current->stack;
657808 	unsigned long irq_stk = (unsigned long)this_cpu_read(irq_stack_ptr);
658809 	unsigned long ovf_stk = (unsigned long)this_cpu_ptr(overflow_stack);
659810 	unsigned int esr = read_sysreg(esr_el1);
660811 	unsigned long far = read_sysreg(far_el1);
812
+
813
+	arm64_enter_nmi(regs);
661814 
662815 	console_verbose();
663816 	pr_emerg("Insufficient stack space to handle exception!");
....@@ -668,7 +821,7 @@
668821 	pr_emerg("Task stack:     [0x%016lx..0x%016lx]\n",
669822 		 tsk_stk, tsk_stk + THREAD_SIZE);
670823 	pr_emerg("IRQ stack:      [0x%016lx..0x%016lx]\n",
671
-		 irq_stk, irq_stk + THREAD_SIZE);
824
+		 irq_stk, irq_stk + IRQ_STACK_SIZE);
672825 	pr_emerg("Overflow stack: [0x%016lx..0x%016lx]\n",
673826 		 ovf_stk, ovf_stk + OVERFLOW_STACK_SIZE);
674827 
....@@ -689,6 +842,8 @@
689842 
690843 	pr_crit("SError Interrupt on CPU%d, code 0x%08x -- %s\n",
691844 		smp_processor_id(), esr, esr_get_class_string(esr));
845
+
846
+	trace_android_rvh_arm64_serror_panic(regs, esr);
692847 	if (regs)
693848 		__show_regs(regs);
694849 
....@@ -716,6 +871,10 @@
716871 		/*
717872 		 * The CPU can't make progress. The exception may have
718873 		 * been imprecise.
874
+		 *
875
+		 * Neoverse-N1 #1349291 means a non-KVM SError reported as
876
+		 * Unrecoverable should be treated as Uncontainable. We
877
+		 * call arm64_serror_panic() in both cases.
719878 		 */
720879 		return true;
721880 
....@@ -726,35 +885,15 @@
726885 	}
727886 }
728887 
729
-asmlinkage void do_serror(struct pt_regs *regs, unsigned int esr)
888
+asmlinkage void noinstr do_serror(struct pt_regs *regs, unsigned int esr)
730889 {
731
-	nmi_enter();
890
+	arm64_enter_nmi(regs);
732891 
733892 	/* non-RAS errors are not containable */
734893 	if (!arm64_is_ras_serror(esr) || arm64_is_fatal_ras_serror(regs, esr))
735894 		arm64_serror_panic(regs, esr);
736895 
737
-	nmi_exit();
738
-}
739
-
740
-void __pte_error(const char *file, int line, unsigned long val)
741
-{
742
-	pr_err("%s:%d: bad pte %016lx.\n", file, line, val);
743
-}
744
-
745
-void __pmd_error(const char *file, int line, unsigned long val)
746
-{
747
-	pr_err("%s:%d: bad pmd %016lx.\n", file, line, val);
748
-}
749
-
750
-void __pud_error(const char *file, int line, unsigned long val)
751
-{
752
-	pr_err("%s:%d: bad pud %016lx.\n", file, line, val);
753
-}
754
-
755
-void __pgd_error(const char *file, int line, unsigned long val)
756
-{
757
-	pr_err("%s:%d: bad pgd %016lx.\n", file, line, val);
896
+	arm64_exit_nmi(regs);
758897 }
759898 
760899 /* GENERIC_BUG traps */
....@@ -773,9 +912,6 @@
773912 
774913 static int bug_handler(struct pt_regs *regs, unsigned int esr)
775914 {
776
-	if (user_mode(regs))
777
-		return DBG_HOOK_ERROR;
778
-
779915 	switch (report_bug(regs->pc, regs)) {
780916 	case BUG_TRAP_TYPE_BUG:
781917 		die("Oops - BUG", regs, 0);
....@@ -795,9 +931,23 @@
795931 }
796932 
797933 static struct break_hook bug_break_hook = {
798
-	.esr_val = 0xf2000000 | BUG_BRK_IMM,
799
-	.esr_mask = 0xffffffff,
800934 	.fn = bug_handler,
935
+	.imm = BUG_BRK_IMM,
936
+};
937
+
938
+static int reserved_fault_handler(struct pt_regs *regs, unsigned int esr)
939
+{
940
+	pr_err("%s generated an invalid instruction at %pS!\n",
941
+		"Kernel text patching",
942
+		(void *)instruction_pointer(regs));
943
+
944
+	/* We cannot handle this */
945
+	return DBG_HOOK_ERROR;
946
+}
947
+
948
+static struct break_hook fault_break_hook = {
949
+	.fn = reserved_fault_handler,
950
+	.imm = FAULT_BRK_IMM,
801951 };
802952 
803953 #ifdef CONFIG_KASAN_SW_TAGS
....@@ -814,9 +964,6 @@
814964 	size_t size = KASAN_ESR_SIZE(esr);
815965 	u64 addr = regs->regs[0];
816966 	u64 pc = regs->pc;
817
-
818
-	if (user_mode(regs))
819
-		return DBG_HOOK_ERROR;
820967 
821968 	kasan_report(addr, size, write, pc);
822969 
....@@ -842,13 +989,10 @@
842989 	return DBG_HOOK_HANDLED;
843990 }
844991 
845
-#define KASAN_ESR_VAL (0xf2000000 | KASAN_BRK_IMM)
846
-#define KASAN_ESR_MASK 0xffffff00
847
-
848992 static struct break_hook kasan_break_hook = {
849
-	.esr_val = KASAN_ESR_VAL,
850
-	.esr_mask = KASAN_ESR_MASK,
851
-	.fn = kasan_handler,
993
+	.fn	= kasan_handler,
994
+	.imm	= KASAN_BRK_IMM,
995
+	.mask	= KASAN_BRK_MASK,
852996 };
853997 #endif
854998 
....@@ -860,17 +1004,20 @@
8601004 		struct pt_regs *regs)
8611005 {
8621006 #ifdef CONFIG_KASAN_SW_TAGS
863
-	if ((esr & KASAN_ESR_MASK) == KASAN_ESR_VAL)
1007
+	unsigned int comment = esr & ESR_ELx_BRK64_ISS_COMMENT_MASK;
1008
+
1009
+	if ((comment & ~KASAN_BRK_MASK) == KASAN_BRK_IMM)
8641010 		return kasan_handler(regs, esr) != DBG_HOOK_HANDLED;
8651011 #endif
8661012 	return bug_handler(regs, esr) != DBG_HOOK_HANDLED;
8671013 }
8681014 
869
-/* This registration must happen early, before debug_traps_init(). */
8701015 void __init trap_init(void)
8711016 {
872
-	register_break_hook(&bug_break_hook);
1017
+	register_kernel_break_hook(&bug_break_hook);
1018
+	register_kernel_break_hook(&fault_break_hook);
8731019 #ifdef CONFIG_KASAN_SW_TAGS
874
-	register_break_hook(&kasan_break_hook);
1020
+	register_kernel_break_hook(&kasan_break_hook);
8751021 #endif
1022
+	debug_traps_init();
8761023 }