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Linux/arch/unicore32/kernel/traps.c

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  1 /*
  2  * linux/arch/unicore32/kernel/traps.c
  3  *
  4  * Code specific to PKUnity SoC and UniCore ISA
  5  *
  6  * Copyright (C) 2001-2010 GUAN Xue-tao
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  *  'traps.c' handles hardware exceptions after we have saved some state.
 13  *  Mostly a debugging aid, but will probably kill the offending process.
 14  */
 15 #include <linux/module.h>
 16 #include <linux/signal.h>
 17 #include <linux/spinlock.h>
 18 #include <linux/personality.h>
 19 #include <linux/kallsyms.h>
 20 #include <linux/kdebug.h>
 21 #include <linux/uaccess.h>
 22 #include <linux/delay.h>
 23 #include <linux/hardirq.h>
 24 #include <linux/init.h>
 25 #include <linux/atomic.h>
 26 #include <linux/unistd.h>
 27 
 28 #include <asm/cacheflush.h>
 29 #include <asm/traps.h>
 30 
 31 #include "setup.h"
 32 
 33 static void dump_mem(const char *, const char *, unsigned long, unsigned long);
 34 
 35 void dump_backtrace_entry(unsigned long where,
 36                 unsigned long from, unsigned long frame)
 37 {
 38 #ifdef CONFIG_KALLSYMS
 39         printk(KERN_DEFAULT "[<%08lx>] (%pS) from [<%08lx>] (%pS)\n",
 40                         where, (void *)where, from, (void *)from);
 41 #else
 42         printk(KERN_DEFAULT "Function entered at [<%08lx>] from [<%08lx>]\n",
 43                         where, from);
 44 #endif
 45 }
 46 
 47 /*
 48  * Stack pointers should always be within the kernels view of
 49  * physical memory.  If it is not there, then we can't dump
 50  * out any information relating to the stack.
 51  */
 52 static int verify_stack(unsigned long sp)
 53 {
 54         if (sp < PAGE_OFFSET ||
 55             (sp > (unsigned long)high_memory && high_memory != NULL))
 56                 return -EFAULT;
 57 
 58         return 0;
 59 }
 60 
 61 /*
 62  * Dump out the contents of some memory nicely...
 63  */
 64 static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
 65                      unsigned long top)
 66 {
 67         unsigned long first;
 68         mm_segment_t fs;
 69         int i;
 70 
 71         /*
 72          * We need to switch to kernel mode so that we can use __get_user
 73          * to safely read from kernel space.  Note that we now dump the
 74          * code first, just in case the backtrace kills us.
 75          */
 76         fs = get_fs();
 77         set_fs(KERNEL_DS);
 78 
 79         printk(KERN_DEFAULT "%s%s(0x%08lx to 0x%08lx)\n",
 80                         lvl, str, bottom, top);
 81 
 82         for (first = bottom & ~31; first < top; first += 32) {
 83                 unsigned long p;
 84                 char str[sizeof(" 12345678") * 8 + 1];
 85 
 86                 memset(str, ' ', sizeof(str));
 87                 str[sizeof(str) - 1] = '\0';
 88 
 89                 for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
 90                         if (p >= bottom && p < top) {
 91                                 unsigned long val;
 92                                 if (__get_user(val, (unsigned long *)p) == 0)
 93                                         sprintf(str + i * 9, " %08lx", val);
 94                                 else
 95                                         sprintf(str + i * 9, " ????????");
 96                         }
 97                 }
 98                 printk(KERN_DEFAULT "%s%04lx:%s\n", lvl, first & 0xffff, str);
 99         }
100 
101         set_fs(fs);
102 }
103 
104 static void dump_instr(const char *lvl, struct pt_regs *regs)
105 {
106         unsigned long addr = instruction_pointer(regs);
107         const int width = 8;
108         mm_segment_t fs;
109         char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
110         int i;
111 
112         /*
113          * We need to switch to kernel mode so that we can use __get_user
114          * to safely read from kernel space.  Note that we now dump the
115          * code first, just in case the backtrace kills us.
116          */
117         fs = get_fs();
118         set_fs(KERNEL_DS);
119 
120         for (i = -4; i < 1; i++) {
121                 unsigned int val, bad;
122 
123                 bad = __get_user(val, &((u32 *)addr)[i]);
124 
125                 if (!bad)
126                         p += sprintf(p, i == 0 ? "(%0*x) " : "%0*x ",
127                                         width, val);
128                 else {
129                         p += sprintf(p, "bad PC value");
130                         break;
131                 }
132         }
133         printk(KERN_DEFAULT "%sCode: %s\n", lvl, str);
134 
135         set_fs(fs);
136 }
137 
138 static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
139 {
140         unsigned int fp, mode;
141         int ok = 1;
142 
143         printk(KERN_DEFAULT "Backtrace: ");
144 
145         if (!tsk)
146                 tsk = current;
147 
148         if (regs) {
149                 fp = regs->UCreg_fp;
150                 mode = processor_mode(regs);
151         } else if (tsk != current) {
152                 fp = thread_saved_fp(tsk);
153                 mode = 0x10;
154         } else {
155                 asm("mov %0, fp" : "=r" (fp) : : "cc");
156                 mode = 0x10;
157         }
158 
159         if (!fp) {
160                 printk("no frame pointer");
161                 ok = 0;
162         } else if (verify_stack(fp)) {
163                 printk("invalid frame pointer 0x%08x", fp);
164                 ok = 0;
165         } else if (fp < (unsigned long)end_of_stack(tsk))
166                 printk("frame pointer underflow");
167         printk("\n");
168 
169         if (ok)
170                 c_backtrace(fp, mode);
171 }
172 
173 void show_stack(struct task_struct *tsk, unsigned long *sp)
174 {
175         dump_backtrace(NULL, tsk);
176         barrier();
177 }
178 
179 static int __die(const char *str, int err, struct thread_info *thread,
180                 struct pt_regs *regs)
181 {
182         struct task_struct *tsk = thread->task;
183         static int die_counter;
184         int ret;
185 
186         printk(KERN_EMERG "Internal error: %s: %x [#%d]\n",
187                str, err, ++die_counter);
188 
189         /* trap and error numbers are mostly meaningless on UniCore */
190         ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, \
191                         SIGSEGV);
192         if (ret == NOTIFY_STOP)
193                 return ret;
194 
195         print_modules();
196         __show_regs(regs);
197         printk(KERN_EMERG "Process %.*s (pid: %d, stack limit = 0x%p)\n",
198                 TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
199 
200         if (!user_mode(regs) || in_interrupt()) {
201                 dump_mem(KERN_EMERG, "Stack: ", regs->UCreg_sp,
202                          THREAD_SIZE + (unsigned long)task_stack_page(tsk));
203                 dump_backtrace(regs, tsk);
204                 dump_instr(KERN_EMERG, regs);
205         }
206 
207         return ret;
208 }
209 
210 DEFINE_SPINLOCK(die_lock);
211 
212 /*
213  * This function is protected against re-entrancy.
214  */
215 void die(const char *str, struct pt_regs *regs, int err)
216 {
217         struct thread_info *thread = current_thread_info();
218         int ret;
219 
220         oops_enter();
221 
222         spin_lock_irq(&die_lock);
223         console_verbose();
224         bust_spinlocks(1);
225         ret = __die(str, err, thread, regs);
226 
227         bust_spinlocks(0);
228         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
229         spin_unlock_irq(&die_lock);
230         oops_exit();
231 
232         if (in_interrupt())
233                 panic("Fatal exception in interrupt");
234         if (panic_on_oops)
235                 panic("Fatal exception");
236         if (ret != NOTIFY_STOP)
237                 do_exit(SIGSEGV);
238 }
239 
240 void uc32_notify_die(const char *str, struct pt_regs *regs,
241                 struct siginfo *info, unsigned long err, unsigned long trap)
242 {
243         if (user_mode(regs)) {
244                 current->thread.error_code = err;
245                 current->thread.trap_no = trap;
246 
247                 force_sig_info(info->si_signo, info, current);
248         } else
249                 die(str, regs, err);
250 }
251 
252 /*
253  * bad_mode handles the impossible case in the vectors.  If you see one of
254  * these, then it's extremely serious, and could mean you have buggy hardware.
255  * It never returns, and never tries to sync.  We hope that we can at least
256  * dump out some state information...
257  */
258 asmlinkage void bad_mode(struct pt_regs *regs, unsigned int reason)
259 {
260         console_verbose();
261 
262         printk(KERN_CRIT "Bad mode detected with reason 0x%x\n", reason);
263 
264         die("Oops - bad mode", regs, 0);
265         local_irq_disable();
266         panic("bad mode");
267 }
268 
269 void __pte_error(const char *file, int line, unsigned long val)
270 {
271         printk(KERN_DEFAULT "%s:%d: bad pte %08lx.\n", file, line, val);
272 }
273 
274 void __pmd_error(const char *file, int line, unsigned long val)
275 {
276         printk(KERN_DEFAULT "%s:%d: bad pmd %08lx.\n", file, line, val);
277 }
278 
279 void __pgd_error(const char *file, int line, unsigned long val)
280 {
281         printk(KERN_DEFAULT "%s:%d: bad pgd %08lx.\n", file, line, val);
282 }
283 
284 asmlinkage void __div0(void)
285 {
286         printk(KERN_DEFAULT "Division by zero in kernel.\n");
287         dump_stack();
288 }
289 EXPORT_SYMBOL(__div0);
290 
291 void abort(void)
292 {
293         BUG();
294 
295         /* if that doesn't kill us, halt */
296         panic("Oops failed to kill thread");
297 }
298 EXPORT_SYMBOL(abort);
299 
300 void __init trap_init(void)
301 {
302         return;
303 }
304 
305 void __init early_trap_init(void)
306 {
307         unsigned long vectors = VECTORS_BASE;
308 
309         /*
310          * Copy the vectors, stubs (in entry-unicore.S)
311          * into the vector page, mapped at 0xffff0000, and ensure these
312          * are visible to the instruction stream.
313          */
314         memcpy((void *)vectors,
315                         __vectors_start,
316                         __vectors_end - __vectors_start);
317         memcpy((void *)vectors + 0x200,
318                         __stubs_start,
319                         __stubs_end - __stubs_start);
320 
321         early_signal_init();
322 
323         flush_icache_range(vectors, vectors + PAGE_SIZE);
324 }
325 

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