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ARM: rockchip: fix broken build
[linux/fpc-iii.git] / arch / arm64 / kernel / traps.c
blob566bc4c350405427f1fb441169b300733aa6ddfd
1 /*
2 * Based on arch/arm/kernel/traps.c
3 *
4 * Copyright (C) 1995-2009 Russell King
5 * 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/>.
18 */
19
20 #include <linux/signal.h>
21 #include <linux/personality.h>
22 #include <linux/kallsyms.h>
23 #include <linux/spinlock.h>
24 #include <linux/uaccess.h>
25 #include <linux/hardirq.h>
26 #include <linux/kdebug.h>
27 #include <linux/module.h>
28 #include <linux/kexec.h>
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #include <linux/sched.h>
32 #include <linux/syscalls.h>
33
34 #include <asm/atomic.h>
35 #include <asm/debug-monitors.h>
36 #include <asm/esr.h>
37 #include <asm/traps.h>
38 #include <asm/stacktrace.h>
39 #include <asm/exception.h>
40 #include <asm/system_misc.h>
41
42 static const char *handler[]= {
43 "Synchronous Abort",
44 "IRQ",
45 "FIQ",
46 "Error"
47 };
48
49 int show_unhandled_signals = 1;
50
51 /*
52 * Dump out the contents of some memory nicely...
53 */
54 static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
55 unsigned long top)
56 {
57 unsigned long first;
58 mm_segment_t fs;
59 int i;
60
61 /*
62 * We need to switch to kernel mode so that we can use __get_user
63 * to safely read from kernel space. Note that we now dump the
64 * code first, just in case the backtrace kills us.
65 */
66 fs = get_fs();
67 set_fs(KERNEL_DS);
68
69 printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top);
70
71 for (first = bottom & ~31; first < top; first += 32) {
72 unsigned long p;
73 char str[sizeof(" 12345678") * 8 + 1];
74
75 memset(str, ' ', sizeof(str));
76 str[sizeof(str) - 1] = '\0';
77
78 for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
79 if (p >= bottom && p < top) {
80 unsigned int val;
81 if (__get_user(val, (unsigned int *)p) == 0)
82 sprintf(str + i * 9, " %08x", val);
83 else
84 sprintf(str + i * 9, " ????????");
85 }
86 }
87 printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
88 }
89
90 set_fs(fs);
91 }
92
93 static void dump_backtrace_entry(unsigned long where, unsigned long stack)
94 {
95 print_ip_sym(where);
96 if (in_exception_text(where))
97 dump_mem("", "Exception stack", stack,
98 stack + sizeof(struct pt_regs));
99 }
100
101 static void dump_instr(const char *lvl, struct pt_regs *regs)
102 {
103 unsigned long addr = instruction_pointer(regs);
104 mm_segment_t fs;
105 char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
106 int i;
107
108 /*
109 * We need to switch to kernel mode so that we can use __get_user
110 * to safely read from kernel space. Note that we now dump the
111 * code first, just in case the backtrace kills us.
112 */
113 fs = get_fs();
114 set_fs(KERNEL_DS);
115
116 for (i = -4; i < 1; i++) {
117 unsigned int val, bad;
118
119 bad = __get_user(val, &((u32 *)addr)[i]);
120
121 if (!bad)
122 p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
123 else {
124 p += sprintf(p, "bad PC value");
125 break;
126 }
127 }
128 printk("%sCode: %s\n", lvl, str);
129
130 set_fs(fs);
131 }
132
133 static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
134 {
135 struct stackframe frame;
136
137 pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
138
139 if (!tsk)
140 tsk = current;
141
142 if (regs) {
143 frame.fp = regs->regs[29];
144 frame.sp = regs->sp;
145 frame.pc = regs->pc;
146 } else if (tsk == current) {
147 frame.fp = (unsigned long)__builtin_frame_address(0);
148 frame.sp = current_stack_pointer;
149 frame.pc = (unsigned long)dump_backtrace;
150 } else {
151 /*
152 * task blocked in __switch_to
153 */
154 frame.fp = thread_saved_fp(tsk);
155 frame.sp = thread_saved_sp(tsk);
156 frame.pc = thread_saved_pc(tsk);
157 }
158
159 pr_emerg("Call trace:\n");
160 while (1) {
161 unsigned long where = frame.pc;
162 int ret;
163
164 ret = unwind_frame(&frame);
165 if (ret < 0)
166 break;
167 dump_backtrace_entry(where, frame.sp);
168 }
169 }
170
171 void show_stack(struct task_struct *tsk, unsigned long *sp)
172 {
173 dump_backtrace(NULL, tsk);
174 barrier();
175 }
176
177 #ifdef CONFIG_PREEMPT
178 #define S_PREEMPT " PREEMPT"
179 #else
180 #define S_PREEMPT ""
181 #endif
182 #ifdef CONFIG_SMP
183 #define S_SMP " SMP"
184 #else
185 #define S_SMP ""
186 #endif
187
188 static int __die(const char *str, int err, struct thread_info *thread,
189 struct pt_regs *regs)
190 {
191 struct task_struct *tsk = thread->task;
192 static int die_counter;
193 int ret;
194
195 pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
196 str, err, ++die_counter);
197
198 /* trap and error numbers are mostly meaningless on ARM */
199 ret = notify_die(DIE_OOPS, str, regs, err, 0, SIGSEGV);
200 if (ret == NOTIFY_STOP)
201 return ret;
202
203 print_modules();
204 __show_regs(regs);
205 pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
206 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
207
208 if (!user_mode(regs) || in_interrupt()) {
209 dump_mem(KERN_EMERG, "Stack: ", regs->sp,
210 THREAD_SIZE + (unsigned long)task_stack_page(tsk));
211 dump_backtrace(regs, tsk);
212 dump_instr(KERN_EMERG, regs);
213 }
214
215 return ret;
216 }
217
218 static DEFINE_RAW_SPINLOCK(die_lock);
219
220 /*
221 * This function is protected against re-entrancy.
222 */
223 void die(const char *str, struct pt_regs *regs, int err)
224 {
225 struct thread_info *thread = current_thread_info();
226 int ret;
227
228 oops_enter();
229
230 raw_spin_lock_irq(&die_lock);
231 console_verbose();
232 bust_spinlocks(1);
233 ret = __die(str, err, thread, regs);
234
235 if (regs && kexec_should_crash(thread->task))
236 crash_kexec(regs);
237
238 bust_spinlocks(0);
239 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
240 raw_spin_unlock_irq(&die_lock);
241 oops_exit();
242
243 if (in_interrupt())
244 panic("Fatal exception in interrupt");
245 if (panic_on_oops)
246 panic("Fatal exception");
247 if (ret != NOTIFY_STOP)
248 do_exit(SIGSEGV);
249 }
250
251 void arm64_notify_die(const char *str, struct pt_regs *regs,
252 struct siginfo *info, int err)
253 {
254 if (user_mode(regs)) {
255 current->thread.fault_address = 0;
256 current->thread.fault_code = err;
257 force_sig_info(info->si_signo, info, current);
258 } else {
259 die(str, regs, err);
260 }
261 }
262
263 static LIST_HEAD(undef_hook);
264 static DEFINE_RAW_SPINLOCK(undef_lock);
265
266 void register_undef_hook(struct undef_hook *hook)
267 {
268 unsigned long flags;
269
270 raw_spin_lock_irqsave(&undef_lock, flags);
271 list_add(&hook->node, &undef_hook);
272 raw_spin_unlock_irqrestore(&undef_lock, flags);
273 }
274
275 void unregister_undef_hook(struct undef_hook *hook)
276 {
277 unsigned long flags;
278
279 raw_spin_lock_irqsave(&undef_lock, flags);
280 list_del(&hook->node);
281 raw_spin_unlock_irqrestore(&undef_lock, flags);
282 }
283
284 static int call_undef_hook(struct pt_regs *regs)
285 {
286 struct undef_hook *hook;
287 unsigned long flags;
288 u32 instr;
289 int (*fn)(struct pt_regs *regs, u32 instr) = NULL;
290 void __user *pc = (void __user *)instruction_pointer(regs);
291
292 if (!user_mode(regs))
293 return 1;
294
295 if (compat_thumb_mode(regs)) {
296 /* 16-bit Thumb instruction */
297 if (get_user(instr, (u16 __user *)pc))
298 goto exit;
299 instr = le16_to_cpu(instr);
300 if (aarch32_insn_is_wide(instr)) {
301 u32 instr2;
302
303 if (get_user(instr2, (u16 __user *)(pc + 2)))
304 goto exit;
305 instr2 = le16_to_cpu(instr2);
306 instr = (instr << 16) | instr2;
307 }
308 } else {
309 /* 32-bit ARM instruction */
310 if (get_user(instr, (u32 __user *)pc))
311 goto exit;
312 instr = le32_to_cpu(instr);
313 }
314
315 raw_spin_lock_irqsave(&undef_lock, flags);
316 list_for_each_entry(hook, &undef_hook, node)
317 if ((instr & hook->instr_mask) == hook->instr_val &&
318 (regs->pstate & hook->pstate_mask) == hook->pstate_val)
319 fn = hook->fn;
320
321 raw_spin_unlock_irqrestore(&undef_lock, flags);
322 exit:
323 return fn ? fn(regs, instr) : 1;
324 }
325
326 asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
327 {
328 siginfo_t info;
329 void __user *pc = (void __user *)instruction_pointer(regs);
330
331 /* check for AArch32 breakpoint instructions */
332 if (!aarch32_break_handler(regs))
333 return;
334
335 if (call_undef_hook(regs) == 0)
336 return;
337
338 if (unhandled_signal(current, SIGILL) && show_unhandled_signals_ratelimited()) {
339 pr_info("%s[%d]: undefined instruction: pc=%p\n",
340 current->comm, task_pid_nr(current), pc);
341 dump_instr(KERN_INFO, regs);
342 }
343
344 info.si_signo = SIGILL;
345 info.si_errno = 0;
346 info.si_code = ILL_ILLOPC;
347 info.si_addr = pc;
348
349 arm64_notify_die("Oops - undefined instruction", regs, &info, 0);
350 }
351
352 long compat_arm_syscall(struct pt_regs *regs);
353
354 asmlinkage long do_ni_syscall(struct pt_regs *regs)
355 {
356 #ifdef CONFIG_COMPAT
357 long ret;
358 if (is_compat_task()) {
359 ret = compat_arm_syscall(regs);
360 if (ret != -ENOSYS)
361 return ret;
362 }
363 #endif
364
365 if (show_unhandled_signals_ratelimited()) {
366 pr_info("%s[%d]: syscall %d\n", current->comm,
367 task_pid_nr(current), (int)regs->syscallno);
368 dump_instr("", regs);
369 if (user_mode(regs))
370 __show_regs(regs);
371 }
372
373 return sys_ni_syscall();
374 }
375
376 static const char *esr_class_str[] = {
377 [0 ... ESR_ELx_EC_MAX] = "UNRECOGNIZED EC",
378 [ESR_ELx_EC_UNKNOWN] = "Unknown/Uncategorized",
379 [ESR_ELx_EC_WFx] = "WFI/WFE",
380 [ESR_ELx_EC_CP15_32] = "CP15 MCR/MRC",
381 [ESR_ELx_EC_CP15_64] = "CP15 MCRR/MRRC",
382 [ESR_ELx_EC_CP14_MR] = "CP14 MCR/MRC",
383 [ESR_ELx_EC_CP14_LS] = "CP14 LDC/STC",
384 [ESR_ELx_EC_FP_ASIMD] = "ASIMD",
385 [ESR_ELx_EC_CP10_ID] = "CP10 MRC/VMRS",
386 [ESR_ELx_EC_CP14_64] = "CP14 MCRR/MRRC",
387 [ESR_ELx_EC_ILL] = "PSTATE.IL",
388 [ESR_ELx_EC_SVC32] = "SVC (AArch32)",
389 [ESR_ELx_EC_HVC32] = "HVC (AArch32)",
390 [ESR_ELx_EC_SMC32] = "SMC (AArch32)",
391 [ESR_ELx_EC_SVC64] = "SVC (AArch64)",
392 [ESR_ELx_EC_HVC64] = "HVC (AArch64)",
393 [ESR_ELx_EC_SMC64] = "SMC (AArch64)",
394 [ESR_ELx_EC_SYS64] = "MSR/MRS (AArch64)",
395 [ESR_ELx_EC_IMP_DEF] = "EL3 IMP DEF",
396 [ESR_ELx_EC_IABT_LOW] = "IABT (lower EL)",
397 [ESR_ELx_EC_IABT_CUR] = "IABT (current EL)",
398 [ESR_ELx_EC_PC_ALIGN] = "PC Alignment",
399 [ESR_ELx_EC_DABT_LOW] = "DABT (lower EL)",
400 [ESR_ELx_EC_DABT_CUR] = "DABT (current EL)",
401 [ESR_ELx_EC_SP_ALIGN] = "SP Alignment",
402 [ESR_ELx_EC_FP_EXC32] = "FP (AArch32)",
403 [ESR_ELx_EC_FP_EXC64] = "FP (AArch64)",
404 [ESR_ELx_EC_SERROR] = "SError",
405 [ESR_ELx_EC_BREAKPT_LOW] = "Breakpoint (lower EL)",
406 [ESR_ELx_EC_BREAKPT_CUR] = "Breakpoint (current EL)",
407 [ESR_ELx_EC_SOFTSTP_LOW] = "Software Step (lower EL)",
408 [ESR_ELx_EC_SOFTSTP_CUR] = "Software Step (current EL)",
409 [ESR_ELx_EC_WATCHPT_LOW] = "Watchpoint (lower EL)",
410 [ESR_ELx_EC_WATCHPT_CUR] = "Watchpoint (current EL)",
411 [ESR_ELx_EC_BKPT32] = "BKPT (AArch32)",
412 [ESR_ELx_EC_VECTOR32] = "Vector catch (AArch32)",
413 [ESR_ELx_EC_BRK64] = "BRK (AArch64)",
414 };
415
416 const char *esr_get_class_string(u32 esr)
417 {
418 return esr_class_str[esr >> ESR_ELx_EC_SHIFT];
419 }
420
421 /*
422 * bad_mode handles the impossible case in the exception vector.
423 */
424 asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
425 {
426 siginfo_t info;
427 void __user *pc = (void __user *)instruction_pointer(regs);
428 console_verbose();
429
430 pr_crit("Bad mode in %s handler detected, code 0x%08x -- %s\n",
431 handler[reason], esr, esr_get_class_string(esr));
432 __show_regs(regs);
433
434 info.si_signo = SIGILL;
435 info.si_errno = 0;
436 info.si_code = ILL_ILLOPC;
437 info.si_addr = pc;
438
439 arm64_notify_die("Oops - bad mode", regs, &info, 0);
440 }
441
442 void __pte_error(const char *file, int line, unsigned long val)
443 {
444 pr_crit("%s:%d: bad pte %016lx.\n", file, line, val);
445 }
446
447 void __pmd_error(const char *file, int line, unsigned long val)
448 {
449 pr_crit("%s:%d: bad pmd %016lx.\n", file, line, val);
450 }
451
452 void __pud_error(const char *file, int line, unsigned long val)
453 {
454 pr_crit("%s:%d: bad pud %016lx.\n", file, line, val);
455 }
456
457 void __pgd_error(const char *file, int line, unsigned long val)
458 {
459 pr_crit("%s:%d: bad pgd %016lx.\n", file, line, val);
460 }
461
462 void __init trap_init(void)
463 {
464 return;
465 }
Linux with added FPC-III support