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TOMOYO Linux Cross Reference
Linux/arch/c6x/kernel/traps.c

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  1 /*
  2  *  Port on Texas Instruments TMS320C6x architecture
  3  *
  4  *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
  5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
  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 #include <linux/module.h>
 12 #include <linux/ptrace.h>
 13 #include <linux/kallsyms.h>
 14 #include <linux/bug.h>
 15 
 16 #include <asm/soc.h>
 17 #include <asm/special_insns.h>
 18 #include <asm/traps.h>
 19 
 20 int (*c6x_nmi_handler)(struct pt_regs *regs);
 21 
 22 void __init trap_init(void)
 23 {
 24         ack_exception(EXCEPT_TYPE_NXF);
 25         ack_exception(EXCEPT_TYPE_EXC);
 26         ack_exception(EXCEPT_TYPE_IXF);
 27         ack_exception(EXCEPT_TYPE_SXF);
 28         enable_exception();
 29 }
 30 
 31 void show_regs(struct pt_regs *regs)
 32 {
 33         pr_err("\n");
 34         show_regs_print_info(KERN_ERR);
 35         pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
 36         pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
 37         pr_err("A0: %08lx  B0: %08lx\n", regs->a0, regs->b0);
 38         pr_err("A1: %08lx  B1: %08lx\n", regs->a1, regs->b1);
 39         pr_err("A2: %08lx  B2: %08lx\n", regs->a2, regs->b2);
 40         pr_err("A3: %08lx  B3: %08lx\n", regs->a3, regs->b3);
 41         pr_err("A4: %08lx  B4: %08lx\n", regs->a4, regs->b4);
 42         pr_err("A5: %08lx  B5: %08lx\n", regs->a5, regs->b5);
 43         pr_err("A6: %08lx  B6: %08lx\n", regs->a6, regs->b6);
 44         pr_err("A7: %08lx  B7: %08lx\n", regs->a7, regs->b7);
 45         pr_err("A8: %08lx  B8: %08lx\n", regs->a8, regs->b8);
 46         pr_err("A9: %08lx  B9: %08lx\n", regs->a9, regs->b9);
 47         pr_err("A10: %08lx  B10: %08lx\n", regs->a10, regs->b10);
 48         pr_err("A11: %08lx  B11: %08lx\n", regs->a11, regs->b11);
 49         pr_err("A12: %08lx  B12: %08lx\n", regs->a12, regs->b12);
 50         pr_err("A13: %08lx  B13: %08lx\n", regs->a13, regs->b13);
 51         pr_err("A14: %08lx  B14: %08lx\n", regs->a14, regs->dp);
 52         pr_err("A15: %08lx  B15: %08lx\n", regs->a15, regs->sp);
 53         pr_err("A16: %08lx  B16: %08lx\n", regs->a16, regs->b16);
 54         pr_err("A17: %08lx  B17: %08lx\n", regs->a17, regs->b17);
 55         pr_err("A18: %08lx  B18: %08lx\n", regs->a18, regs->b18);
 56         pr_err("A19: %08lx  B19: %08lx\n", regs->a19, regs->b19);
 57         pr_err("A20: %08lx  B20: %08lx\n", regs->a20, regs->b20);
 58         pr_err("A21: %08lx  B21: %08lx\n", regs->a21, regs->b21);
 59         pr_err("A22: %08lx  B22: %08lx\n", regs->a22, regs->b22);
 60         pr_err("A23: %08lx  B23: %08lx\n", regs->a23, regs->b23);
 61         pr_err("A24: %08lx  B24: %08lx\n", regs->a24, regs->b24);
 62         pr_err("A25: %08lx  B25: %08lx\n", regs->a25, regs->b25);
 63         pr_err("A26: %08lx  B26: %08lx\n", regs->a26, regs->b26);
 64         pr_err("A27: %08lx  B27: %08lx\n", regs->a27, regs->b27);
 65         pr_err("A28: %08lx  B28: %08lx\n", regs->a28, regs->b28);
 66         pr_err("A29: %08lx  B29: %08lx\n", regs->a29, regs->b29);
 67         pr_err("A30: %08lx  B30: %08lx\n", regs->a30, regs->b30);
 68         pr_err("A31: %08lx  B31: %08lx\n", regs->a31, regs->b31);
 69 }
 70 
 71 void die(char *str, struct pt_regs *fp, int nr)
 72 {
 73         console_verbose();
 74         pr_err("%s: %08x\n", str, nr);
 75         show_regs(fp);
 76 
 77         pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
 78                current->comm, current->pid, (PAGE_SIZE +
 79                                              (unsigned long) current));
 80 
 81         dump_stack();
 82         while (1)
 83                 ;
 84 }
 85 
 86 static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
 87 {
 88         if (user_mode(fp))
 89                 return;
 90 
 91         die(str, fp, nr);
 92 }
 93 
 94 
 95 /* Internal exceptions */
 96 static struct exception_info iexcept_table[10] = {
 97         { "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
 98         { "Oops - fetch packet", SIGBUS, BUS_ADRERR },
 99         { "Oops - execute packet", SIGILL, ILL_ILLOPC },
100         { "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
101         { "Oops - resource conflict", SIGILL, ILL_ILLOPC },
102         { "Oops - resource access", SIGILL, ILL_PRVREG },
103         { "Oops - privilege", SIGILL, ILL_PRVOPC },
104         { "Oops - loops buffer", SIGILL, ILL_ILLOPC },
105         { "Oops - software exception", SIGILL, ILL_ILLTRP },
106         { "Oops - unknown exception", SIGILL, ILL_ILLOPC }
107 };
108 
109 /* External exceptions */
110 static struct exception_info eexcept_table[128] = {
111         { "Oops - external exception", SIGBUS, BUS_ADRERR },
112         { "Oops - external exception", SIGBUS, BUS_ADRERR },
113         { "Oops - external exception", SIGBUS, BUS_ADRERR },
114         { "Oops - external exception", SIGBUS, BUS_ADRERR },
115         { "Oops - external exception", SIGBUS, BUS_ADRERR },
116         { "Oops - external exception", SIGBUS, BUS_ADRERR },
117         { "Oops - external exception", SIGBUS, BUS_ADRERR },
118         { "Oops - external exception", SIGBUS, BUS_ADRERR },
119         { "Oops - external exception", SIGBUS, BUS_ADRERR },
120         { "Oops - external exception", SIGBUS, BUS_ADRERR },
121         { "Oops - external exception", SIGBUS, BUS_ADRERR },
122         { "Oops - external exception", SIGBUS, BUS_ADRERR },
123         { "Oops - external exception", SIGBUS, BUS_ADRERR },
124         { "Oops - external exception", SIGBUS, BUS_ADRERR },
125         { "Oops - external exception", SIGBUS, BUS_ADRERR },
126         { "Oops - external exception", SIGBUS, BUS_ADRERR },
127         { "Oops - external exception", SIGBUS, BUS_ADRERR },
128         { "Oops - external exception", SIGBUS, BUS_ADRERR },
129         { "Oops - external exception", SIGBUS, BUS_ADRERR },
130         { "Oops - external exception", SIGBUS, BUS_ADRERR },
131         { "Oops - external exception", SIGBUS, BUS_ADRERR },
132         { "Oops - external exception", SIGBUS, BUS_ADRERR },
133         { "Oops - external exception", SIGBUS, BUS_ADRERR },
134         { "Oops - external exception", SIGBUS, BUS_ADRERR },
135         { "Oops - external exception", SIGBUS, BUS_ADRERR },
136         { "Oops - external exception", SIGBUS, BUS_ADRERR },
137         { "Oops - external exception", SIGBUS, BUS_ADRERR },
138         { "Oops - external exception", SIGBUS, BUS_ADRERR },
139         { "Oops - external exception", SIGBUS, BUS_ADRERR },
140         { "Oops - external exception", SIGBUS, BUS_ADRERR },
141         { "Oops - external exception", SIGBUS, BUS_ADRERR },
142         { "Oops - external exception", SIGBUS, BUS_ADRERR },
143 
144         { "Oops - external exception", SIGBUS, BUS_ADRERR },
145         { "Oops - external exception", SIGBUS, BUS_ADRERR },
146         { "Oops - external exception", SIGBUS, BUS_ADRERR },
147         { "Oops - external exception", SIGBUS, BUS_ADRERR },
148         { "Oops - external exception", SIGBUS, BUS_ADRERR },
149         { "Oops - external exception", SIGBUS, BUS_ADRERR },
150         { "Oops - external exception", SIGBUS, BUS_ADRERR },
151         { "Oops - external exception", SIGBUS, BUS_ADRERR },
152         { "Oops - external exception", SIGBUS, BUS_ADRERR },
153         { "Oops - external exception", SIGBUS, BUS_ADRERR },
154         { "Oops - external exception", SIGBUS, BUS_ADRERR },
155         { "Oops - external exception", SIGBUS, BUS_ADRERR },
156         { "Oops - external exception", SIGBUS, BUS_ADRERR },
157         { "Oops - external exception", SIGBUS, BUS_ADRERR },
158         { "Oops - external exception", SIGBUS, BUS_ADRERR },
159         { "Oops - external exception", SIGBUS, BUS_ADRERR },
160         { "Oops - external exception", SIGBUS, BUS_ADRERR },
161         { "Oops - external exception", SIGBUS, BUS_ADRERR },
162         { "Oops - external exception", SIGBUS, BUS_ADRERR },
163         { "Oops - external exception", SIGBUS, BUS_ADRERR },
164         { "Oops - external exception", SIGBUS, BUS_ADRERR },
165         { "Oops - external exception", SIGBUS, BUS_ADRERR },
166         { "Oops - external exception", SIGBUS, BUS_ADRERR },
167         { "Oops - external exception", SIGBUS, BUS_ADRERR },
168         { "Oops - external exception", SIGBUS, BUS_ADRERR },
169         { "Oops - external exception", SIGBUS, BUS_ADRERR },
170         { "Oops - external exception", SIGBUS, BUS_ADRERR },
171         { "Oops - external exception", SIGBUS, BUS_ADRERR },
172         { "Oops - external exception", SIGBUS, BUS_ADRERR },
173         { "Oops - external exception", SIGBUS, BUS_ADRERR },
174         { "Oops - external exception", SIGBUS, BUS_ADRERR },
175         { "Oops - external exception", SIGBUS, BUS_ADRERR },
176 
177         { "Oops - external exception", SIGBUS, BUS_ADRERR },
178         { "Oops - external exception", SIGBUS, BUS_ADRERR },
179         { "Oops - external exception", SIGBUS, BUS_ADRERR },
180         { "Oops - external exception", SIGBUS, BUS_ADRERR },
181         { "Oops - external exception", SIGBUS, BUS_ADRERR },
182         { "Oops - external exception", SIGBUS, BUS_ADRERR },
183         { "Oops - external exception", SIGBUS, BUS_ADRERR },
184         { "Oops - external exception", SIGBUS, BUS_ADRERR },
185         { "Oops - external exception", SIGBUS, BUS_ADRERR },
186         { "Oops - external exception", SIGBUS, BUS_ADRERR },
187         { "Oops - external exception", SIGBUS, BUS_ADRERR },
188         { "Oops - external exception", SIGBUS, BUS_ADRERR },
189         { "Oops - external exception", SIGBUS, BUS_ADRERR },
190         { "Oops - external exception", SIGBUS, BUS_ADRERR },
191         { "Oops - external exception", SIGBUS, BUS_ADRERR },
192         { "Oops - external exception", SIGBUS, BUS_ADRERR },
193         { "Oops - external exception", SIGBUS, BUS_ADRERR },
194         { "Oops - external exception", SIGBUS, BUS_ADRERR },
195         { "Oops - external exception", SIGBUS, BUS_ADRERR },
196         { "Oops - external exception", SIGBUS, BUS_ADRERR },
197         { "Oops - external exception", SIGBUS, BUS_ADRERR },
198         { "Oops - external exception", SIGBUS, BUS_ADRERR },
199         { "Oops - external exception", SIGBUS, BUS_ADRERR },
200         { "Oops - external exception", SIGBUS, BUS_ADRERR },
201         { "Oops - external exception", SIGBUS, BUS_ADRERR },
202         { "Oops - external exception", SIGBUS, BUS_ADRERR },
203         { "Oops - external exception", SIGBUS, BUS_ADRERR },
204         { "Oops - external exception", SIGBUS, BUS_ADRERR },
205         { "Oops - external exception", SIGBUS, BUS_ADRERR },
206         { "Oops - external exception", SIGBUS, BUS_ADRERR },
207         { "Oops - external exception", SIGBUS, BUS_ADRERR },
208         { "Oops - external exception", SIGBUS, BUS_ADRERR },
209 
210         { "Oops - external exception", SIGBUS, BUS_ADRERR },
211         { "Oops - external exception", SIGBUS, BUS_ADRERR },
212         { "Oops - external exception", SIGBUS, BUS_ADRERR },
213         { "Oops - external exception", SIGBUS, BUS_ADRERR },
214         { "Oops - external exception", SIGBUS, BUS_ADRERR },
215         { "Oops - external exception", SIGBUS, BUS_ADRERR },
216         { "Oops - external exception", SIGBUS, BUS_ADRERR },
217         { "Oops - external exception", SIGBUS, BUS_ADRERR },
218         { "Oops - external exception", SIGBUS, BUS_ADRERR },
219         { "Oops - external exception", SIGBUS, BUS_ADRERR },
220         { "Oops - external exception", SIGBUS, BUS_ADRERR },
221         { "Oops - external exception", SIGBUS, BUS_ADRERR },
222         { "Oops - external exception", SIGBUS, BUS_ADRERR },
223         { "Oops - external exception", SIGBUS, BUS_ADRERR },
224         { "Oops - external exception", SIGBUS, BUS_ADRERR },
225         { "Oops - external exception", SIGBUS, BUS_ADRERR },
226         { "Oops - external exception", SIGBUS, BUS_ADRERR },
227         { "Oops - external exception", SIGBUS, BUS_ADRERR },
228         { "Oops - external exception", SIGBUS, BUS_ADRERR },
229         { "Oops - external exception", SIGBUS, BUS_ADRERR },
230         { "Oops - external exception", SIGBUS, BUS_ADRERR },
231         { "Oops - external exception", SIGBUS, BUS_ADRERR },
232         { "Oops - external exception", SIGBUS, BUS_ADRERR },
233         { "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
234         { "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
235         { "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
236         { "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
237         { "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
238         { "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
239         { "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
240         { "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
241         { "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
242 };
243 
244 static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
245 {
246         unsigned long addr = instruction_pointer(regs);
247         siginfo_t info;
248 
249         if (except_info->code != TRAP_BRKPT)
250                 pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
251                        except_info->kernel_str, regs->pc,
252                        except_info->signo, except_info->code);
253 
254         die_if_kernel(except_info->kernel_str, regs, addr);
255 
256         info.si_signo = except_info->signo;
257         info.si_errno = 0;
258         info.si_code  = except_info->code;
259         info.si_addr  = (void __user *)addr;
260 
261         force_sig_info(except_info->signo, &info, current);
262 }
263 
264 /*
265  * Process an internal exception (non maskable)
266  */
267 static int process_iexcept(struct pt_regs *regs)
268 {
269         unsigned int iexcept_report = get_iexcept();
270         unsigned int iexcept_num;
271 
272         ack_exception(EXCEPT_TYPE_IXF);
273 
274         pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
275 
276         while (iexcept_report) {
277                 iexcept_num = __ffs(iexcept_report);
278                 iexcept_report &= ~(1 << iexcept_num);
279                 set_iexcept(iexcept_report);
280                 if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
281                         /* This is a breakpoint */
282                         struct exception_info bkpt_exception = {
283                                 "Oops - undefined instruction",
284                                   SIGTRAP, TRAP_BRKPT
285                         };
286                         do_trap(&bkpt_exception, regs);
287                         iexcept_report &= ~(0xFF);
288                         set_iexcept(iexcept_report);
289                         continue;
290                 }
291 
292                 do_trap(&iexcept_table[iexcept_num], regs);
293         }
294         return 0;
295 }
296 
297 /*
298  * Process an external exception (maskable)
299  */
300 static void process_eexcept(struct pt_regs *regs)
301 {
302         int evt;
303 
304         pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
305 
306         while ((evt = soc_get_exception()) >= 0)
307                 do_trap(&eexcept_table[evt], regs);
308 
309         ack_exception(EXCEPT_TYPE_EXC);
310 }
311 
312 /*
313  * Main exception processing
314  */
315 asmlinkage int process_exception(struct pt_regs *regs)
316 {
317         unsigned int type;
318         unsigned int type_num;
319         unsigned int ie_num = 9; /* default is unknown exception */
320 
321         while ((type = get_except_type()) != 0) {
322                 type_num = fls(type) - 1;
323 
324                 switch (type_num) {
325                 case EXCEPT_TYPE_NXF:
326                         ack_exception(EXCEPT_TYPE_NXF);
327                         if (c6x_nmi_handler)
328                                 (c6x_nmi_handler)(regs);
329                         else
330                                 pr_alert("NMI interrupt!\n");
331                         break;
332 
333                 case EXCEPT_TYPE_IXF:
334                         if (process_iexcept(regs))
335                                 return 1;
336                         break;
337 
338                 case EXCEPT_TYPE_EXC:
339                         process_eexcept(regs);
340                         break;
341 
342                 case EXCEPT_TYPE_SXF:
343                         ie_num = 8;
344                 default:
345                         ack_exception(type_num);
346                         do_trap(&iexcept_table[ie_num], regs);
347                         break;
348                 }
349         }
350         return 0;
351 }
352 
353 static int kstack_depth_to_print = 48;
354 
355 static void show_trace(unsigned long *stack, unsigned long *endstack)
356 {
357         unsigned long addr;
358         int i;
359 
360         pr_debug("Call trace:");
361         i = 0;
362         while (stack + 1 <= endstack) {
363                 addr = *stack++;
364                 /*
365                  * If the address is either in the text segment of the
366                  * kernel, or in the region which contains vmalloc'ed
367                  * memory, it *may* be the address of a calling
368                  * routine; if so, print it so that someone tracing
369                  * down the cause of the crash will be able to figure
370                  * out the call path that was taken.
371                  */
372                 if (__kernel_text_address(addr)) {
373 #ifndef CONFIG_KALLSYMS
374                         if (i % 5 == 0)
375                                 pr_debug("\n        ");
376 #endif
377                         pr_debug(" [<%08lx>]", addr);
378                         print_symbol(" %s\n", addr);
379                         i++;
380                 }
381         }
382         pr_debug("\n");
383 }
384 
385 void show_stack(struct task_struct *task, unsigned long *stack)
386 {
387         unsigned long *p, *endstack;
388         int i;
389 
390         if (!stack) {
391                 if (task && task != current)
392                         /* We know this is a kernel stack,
393                            so this is the start/end */
394                         stack = (unsigned long *)thread_saved_ksp(task);
395                 else
396                         stack = (unsigned long *)&stack;
397         }
398         endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
399                                      & -THREAD_SIZE);
400 
401         pr_debug("Stack from %08lx:", (unsigned long)stack);
402         for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
403                 if (p + 1 > endstack)
404                         break;
405                 if (i % 8 == 0)
406                         pr_cont("\n         ");
407                 pr_cont(" %08lx", *p++);
408         }
409         pr_cont("\n");
410         show_trace(stack, endstack);
411 }
412 
413 int is_valid_bugaddr(unsigned long addr)
414 {
415         return __kernel_text_address(addr);
416 }
417 

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