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 /*
 109  * The architecture-independent backtrace generator
 110  */
 111 void dump_stack(void)
 112 {
 113         unsigned long stack;
 114
 115         show_stack(current, &stack);
 116 }
 117 EXPORT_SYMBOL(dump_stack);
 118
 119 void show_registers(struct pt_regs *regs)
 120 {
 121         int i;
 122         int in_kernel = 1;
 123         unsigned long esp;
 124
 125         esp = (unsigned long)(&regs->sp);
 126         if (user_mode(regs))
 127                 in_kernel = 0;
 128
 129         printk("CPU #: %d\n"
 130                "   PC: %08lx    SR: %08lx    SP: %08lx\n",
 131                smp_processor_id(), regs->pc, regs->sr, regs->sp);
 132         printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
 133                0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
 134         printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
 135                regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
 136         printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
 137                regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
 138         printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
 139                regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
 140         printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
 141                regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
 142         printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
 143                regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
 144         printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
 145                regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
 146         printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
 147                regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
 148         printk("  RES: %08lx oGPR11: %08lx\n",
 149                regs->gpr[11], regs->orig_gpr11);
 150
 151         printk("Process %s (pid: %d, stackpage=%08lx)\n",
 152                current->comm, current->pid, (unsigned long)current);
 153         /*
 154          * When in-kernel, we also print out the stack and code at the
 155          * time of the fault..
 156          */
 157         if (in_kernel) {
 158
 159                 printk("\nStack: ");
 160                 show_stack(NULL, (unsigned long *)esp);
 161
 162                 printk("\nCode: ");
 163                 if (regs->pc < PAGE_OFFSET)
 164                         goto bad;
 165
 166                 for (i = -24; i < 24; i++) {
 167                         unsigned char c;
 168                         if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
 169 bad:
 170                                 printk(" Bad PC value.");
 171                                 break;
 172                         }
 173
 174                         if (i == 0)
 175                                 printk("(%02x) ", c);
 176                         else
 177                                 printk("%02x ", c);
 178                 }
 179         }
 180         printk("\n");
 181 }
 182
 183 void nommu_dump_state(struct pt_regs *regs,
 184                       unsigned long ea, unsigned long vector)
 185 {
 186         int i;
 187         unsigned long addr, stack = regs->sp;
 188
 189         printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
 190
 191         printk("CPU #: %d\n"
 192                "   PC: %08lx    SR: %08lx    SP: %08lx\n",
 193                0, regs->pc, regs->sr, regs->sp);
 194         printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
 195                0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
 196         printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
 197                regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
 198         printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
 199                regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
 200         printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
 201                regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
 202         printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
 203                regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
 204         printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
 205                regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
 206         printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
 207                regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
 208         printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
 209                regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
 210         printk("  RES: %08lx oGPR11: %08lx\n",
 211                regs->gpr[11], regs->orig_gpr11);
 212
 213         printk("Process %s (pid: %d, stackpage=%08lx)\n",
 214                ((struct task_struct *)(__pa(current)))->comm,
 215                ((struct task_struct *)(__pa(current)))->pid,
 216                (unsigned long)current);
 217
 218         printk("\nStack: ");
 219         printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
 220         for (i = 0; i < kstack_depth_to_print; i++) {
 221                 if (((long)stack & (THREAD_SIZE - 1)) == 0)
 222                         break;
 223                 stack++;
 224
 225                 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
 226                        *((unsigned long *)(__pa(stack))));
 227         }
 228         printk("\n");
 229
 230         printk("Call Trace:   ");
 231         i = 1;
 232         while (((long)stack & (THREAD_SIZE - 1)) != 0) {
 233                 addr = *((unsigned long *)__pa(stack));
 234                 stack++;
 235
 236                 if (kernel_text_address(addr)) {
 237                         if (i && ((i % 6) == 0))
 238                                 printk("\n ");
 239                         printk(" [<%08lx>]", addr);
 240                         i++;
 241                 }
 242         }
 243         printk("\n");
 244
 245         printk("\nCode: ");
 246
 247         for (i = -24; i < 24; i++) {
 248                 unsigned char c;
 249                 c = ((unsigned char *)(__pa(regs->pc)))[i];
 250
 251                 if (i == 0)
 252                         printk("(%02x) ", c);
 253                 else
 254                         printk("%02x ", c);
 255         }
 256         printk("\n");
 257 }
 258
 259 /* This is normally the 'Oops' routine */
 260 void die(const char *str, struct pt_regs *regs, long err)
 261 {
 262
 263         console_verbose();
 264         printk("\n%s#: %04lx\n", str, err & 0xffff);
 265         show_registers(regs);
 266 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
 267         printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
 268
 269         /* shut down interrupts */
 270         local_irq_disable();
 271
 272         __asm__ __volatile__("l.nop   1");
 273         do {} while (1);
 274 #endif
 275         do_exit(SIGSEGV);
 276 }
 277
 278 /* This is normally the 'Oops' routine */
 279 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
 280 {
 281         if (user_mode(regs))
 282                 return;
 283
 284         die(str, regs, err);
 285 }
 286
 287 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
 288 {
 289         printk("Unable to handle exception at EA =0x%x, vector 0x%x",
 290                ea, vector);
 291         die("Oops", regs, 9);
 292 }
 293
 294 void __init trap_init(void)
 295 {
 296         /* Nothing needs to be done */
 297 }
 298
 299 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
 300 {
 301         siginfo_t info;
 302         memset(&info, 0, sizeof(info));
 303         info.si_signo = SIGTRAP;
 304         info.si_code = TRAP_TRACE;
 305         info.si_addr = (void *)address;
 306         force_sig_info(SIGTRAP, &info, current);
 307
 308         regs->pc += 4;
 309 }
 310
 311 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
 312 {
 313         siginfo_t info;
 314
 315         if (user_mode(regs)) {
 316                 /* Send a SIGSEGV */
 317                 info.si_signo = SIGSEGV;
 318                 info.si_errno = 0;
 319                 /* info.si_code has been set above */
 320                 info.si_addr = (void *)address;
 321                 force_sig_info(SIGSEGV, &info, current);
 322         } else {
 323                 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
 324                 show_registers(regs);
 325                 die("Die:", regs, address);
 326         }
 327
 328 }
 329
 330 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
 331 {
 332         siginfo_t info;
 333
 334         if (user_mode(regs)) {
 335                 /* Send a SIGBUS */
 336                 info.si_signo = SIGBUS;
 337                 info.si_errno = 0;
 338                 info.si_code = BUS_ADRERR;
 339                 info.si_addr = (void *)address;
 340                 force_sig_info(SIGBUS, &info, current);
 341         } else {                /* Kernel mode */
 342                 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
 343                 show_registers(regs);
 344                 die("Die:", regs, address);
 345         }
 346 }
 347
 348 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
 349                                        unsigned long address)
 350 {
 351         siginfo_t info;
 352
 353         if (user_mode(regs)) {
 354                 /* Send a SIGILL */
 355                 info.si_signo = SIGILL;
 356                 info.si_errno = 0;
 357                 info.si_code = ILL_ILLOPC;
 358                 info.si_addr = (void *)address;
 359                 force_sig_info(SIGBUS, &info, current);
 360         } else {                /* Kernel mode */
 361                 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
 362                        address);
 363                 show_registers(regs);
 364                 die("Die:", regs, address);
 365         }
 366 }