arch/openrisc/kernel/traps.c

   1 /*
   2  * OpenRISC traps.c
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * Modifications for the OpenRISC architecture:
   9  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *  Here we handle the break vectors not used by the system call
  18  *  mechanism, as well as some general stack/register dumping
  19  *  things.
  20  *
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/sched.h>
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/kmod.h>
  28 #include <linux/string.h>
  29 #include <linux/errno.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/timer.h>
  32 #include <linux/mm.h>
  33 #include <linux/kallsyms.h>
  34 #include <asm/uaccess.h>
  35
  36 #include <asm/segment.h>
  37 #include <asm/io.h>
  38 #include <asm/pgtable.h>
  39
  40 extern char _etext, _stext;
  41
  42 int kstack_depth_to_print = 0x180;
  43
  44 static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
  45 {
  46         return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
  47 }
  48
  49 void show_trace(struct task_struct *task, unsigned long *stack)
  50 {
  51         struct thread_info *context;
  52         unsigned long addr;
  53
  54         context = (struct thread_info *)
  55             ((unsigned long)stack & (~(THREAD_SIZE - 1)));
  56
  57         while (valid_stack_ptr(context, stack)) {
  58                 addr = *stack++;
  59                 if (__kernel_text_address(addr)) {
  60                         printk(" [<%08lx>]", addr);
  61                         print_symbol(" %s", addr);
  62                         printk("\n");
  63                 }
  64         }
  65         printk(" =======================\n");
  66 }
  67
  68 /* displays a short stack trace */
  69 void show_stack(struct task_struct *task, unsigned long *esp)
  70 {
  71         unsigned long addr, *stack;
  72         int i;
  73
  74         if (esp == NULL)
  75                 esp = (unsigned long *)&esp;
  76
  77         stack = esp;
  78
  79         printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
  80         for (i = 0; i < kstack_depth_to_print; i++) {
  81                 if (kstack_end(stack))
  82                         break;
  83                 if (__get_user(addr, stack)) {
  84                         /* This message matches "failing address" marked
  85                            s390 in ksymoops, so lines containing it will
  86                            not be filtered out by ksymoops.  */
  87                         printk("Failing address 0x%lx\n", (unsigned long)stack);
  88                         break;
  89                 }
  90                 stack++;
  91
  92                 printk("sp + %02d: 0x%08lx\n", i * 4, addr);
  93         }
  94         printk("\n");
  95
  96         show_trace(task, esp);
  97
  98         return;
  99 }
 100
 101 void show_trace_task(struct task_struct *tsk)
 102 {
 103         /*
 104          * TODO: SysRq-T trace dump...
 105          */
 106 }
 107
 108 void show_registers(struct pt_regs *regs)
 109 {
 110         int i;
 111         int in_kernel = 1;
 112         unsigned long esp;
 113
 114         esp = (unsigned long)(&regs->sp);
 115         if (user_mode(regs))
 116                 in_kernel = 0;
 117
 118         printk("CPU #: %d\n"
 119                "   PC: %08lx    SR: %08lx    SP: %08lx\n",
 120                smp_processor_id(), regs->pc, regs->sr, regs->sp);
 121         printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
 122                0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
 123         printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
 124                regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
 125         printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
 126                regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
 127         printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
 128                regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
 129         printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
 130                regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
 131         printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
 132                regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
 133         printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
 134                regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
 135         printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
 136                regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
 137         printk("  RES: %08lx oGPR11: %08lx\n",
 138                regs->gpr[11], regs->orig_gpr11);
 139
 140         printk("Process %s (pid: %d, stackpage=%08lx)\n",
 141                current->comm, current->pid, (unsigned long)current);
 142         /*
 143          * When in-kernel, we also print out the stack and code at the
 144          * time of the fault..
 145          */
 146         if (in_kernel) {
 147
 148                 printk("\nStack: ");
 149                 show_stack(NULL, (unsigned long *)esp);
 150
 151                 printk("\nCode: ");
 152                 if (regs->pc < PAGE_OFFSET)
 153                         goto bad;
 154
 155                 for (i = -24; i < 24; i++) {
 156                         unsigned char c;
 157                         if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
 158 bad:
 159                                 printk(" Bad PC value.");
 160                                 break;
 161                         }
 162
 163                         if (i == 0)
 164                                 printk("(%02x) ", c);
 165                         else
 166                                 printk("%02x ", c);
 167                 }
 168         }
 169         printk("\n");
 170 }
 171
 172 void nommu_dump_state(struct pt_regs *regs,
 173                       unsigned long ea, unsigned long vector)
 174 {
 175         int i;
 176         unsigned long addr, stack = regs->sp;
 177
 178         printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
 179
 180         printk("CPU #: %d\n"
 181                "   PC: %08lx    SR: %08lx    SP: %08lx\n",
 182                0, regs->pc, regs->sr, regs->sp);
 183         printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
 184                0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
 185         printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
 186                regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
 187         printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
 188                regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
 189         printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
 190                regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
 191         printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
 192                regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
 193         printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
 194                regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
 195         printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
 196                regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
 197         printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
 198                regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
 199         printk("  RES: %08lx oGPR11: %08lx\n",
 200                regs->gpr[11], regs->orig_gpr11);
 201
 202         printk("Process %s (pid: %d, stackpage=%08lx)\n",
 203                ((struct task_struct *)(__pa(current)))->comm,
 204                ((struct task_struct *)(__pa(current)))->pid,
 205                (unsigned long)current);
 206
 207         printk("\nStack: ");
 208         printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
 209         for (i = 0; i < kstack_depth_to_print; i++) {
 210                 if (((long)stack & (THREAD_SIZE - 1)) == 0)
 211                         break;
 212                 stack++;
 213
 214                 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
 215                        *((unsigned long *)(__pa(stack))));
 216         }
 217         printk("\n");
 218
 219         printk("Call Trace:   ");
 220         i = 1;
 221         while (((long)stack & (THREAD_SIZE - 1)) != 0) {
 222                 addr = *((unsigned long *)__pa(stack));
 223                 stack++;
 224
 225                 if (kernel_text_address(addr)) {
 226                         if (i && ((i % 6) == 0))
 227                                 printk("\n ");
 228                         printk(" [<%08lx>]", addr);
 229                         i++;
 230                 }
 231         }
 232         printk("\n");
 233
 234         printk("\nCode: ");
 235
 236         for (i = -24; i < 24; i++) {
 237                 unsigned char c;
 238                 c = ((unsigned char *)(__pa(regs->pc)))[i];
 239
 240                 if (i == 0)
 241                         printk("(%02x) ", c);
 242                 else
 243                         printk("%02x ", c);
 244         }
 245         printk("\n");
 246 }
 247
 248 /* This is normally the 'Oops' routine */
 249 void die(const char *str, struct pt_regs *regs, long err)
 250 {
 251
 252         console_verbose();
 253         printk("\n%s#: %04lx\n", str, err & 0xffff);
 254         show_registers(regs);
 255 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
 256         printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
 257
 258         /* shut down interrupts */
 259         local_irq_disable();
 260
 261         __asm__ __volatile__("l.nop   1");
 262         do {} while (1);
 263 #endif
 264         do_exit(SIGSEGV);
 265 }
 266
 267 /* This is normally the 'Oops' routine */
 268 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
 269 {
 270         if (user_mode(regs))
 271                 return;
 272
 273         die(str, regs, err);
 274 }
 275
 276 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
 277 {
 278         printk("Unable to handle exception at EA =0x%x, vector 0x%x",
 279                ea, vector);
 280         die("Oops", regs, 9);
 281 }
 282
 283 void __init trap_init(void)
 284 {
 285         /* Nothing needs to be done */
 286 }
 287
 288 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
 289 {
 290         siginfo_t info;
 291         memset(&info, 0, sizeof(info));
 292         info.si_signo = SIGTRAP;
 293         info.si_code = TRAP_TRACE;
 294         info.si_addr = (void *)address;
 295         force_sig_info(SIGTRAP, &info, current);
 296
 297         regs->pc += 4;
 298 }
 299
 300 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
 301 {
 302         siginfo_t info;
 303
 304         if (user_mode(regs)) {
 305                 /* Send a SIGSEGV */
 306                 info.si_signo = SIGSEGV;
 307                 info.si_errno = 0;
 308                 /* info.si_code has been set above */
 309                 info.si_addr = (void *)address;
 310                 force_sig_info(SIGSEGV, &info, current);
 311         } else {
 312                 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
 313                 show_registers(regs);
 314                 die("Die:", regs, address);
 315         }
 316
 317 }
 318
 319 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
 320 {
 321         siginfo_t info;
 322
 323         if (user_mode(regs)) {
 324                 /* Send a SIGBUS */
 325                 info.si_signo = SIGBUS;
 326                 info.si_errno = 0;
 327                 info.si_code = BUS_ADRERR;
 328                 info.si_addr = (void *)address;
 329                 force_sig_info(SIGBUS, &info, current);
 330         } else {                /* Kernel mode */
 331                 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
 332                 show_registers(regs);
 333                 die("Die:", regs, address);
 334         }
 335 }
 336
 337 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
 338                                        unsigned long address)
 339 {
 340         siginfo_t info;
 341
 342         if (user_mode(regs)) {
 343                 /* Send a SIGILL */
 344                 info.si_signo = SIGILL;
 345                 info.si_errno = 0;
 346                 info.si_code = ILL_ILLOPC;
 347                 info.si_addr = (void *)address;
 348                 force_sig_info(SIGBUS, &info, current);
 349         } else {                /* Kernel mode */
 350                 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
 351                        address);
 352                 show_registers(regs);
 353                 die("Die:", regs, address);
 354         }
 355 }