LXR linux/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
  40extern char _etext, _stext;
  41
  42int kstack_depth_to_print = 0x180;
  43
  44static 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
  49void 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 */
  69void 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
 101void 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 */
 111void dump_stack(void)
 112{
 113        unsigned long stack;
 114
 115        show_stack(current, &stack);
 116}
 117EXPORT_SYMBOL(dump_stack);
 118
 119void 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])) {
 169bad:
 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
 183void 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 */
 260void 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 */
 279void 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
 287void 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
 294void __init trap_init(void)
 295{
 296        /* Nothing needs to be done */
 297}
 298
 299asmlinkage 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
 311asmlinkage 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
 330asmlinkage 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
 348asmlinkage 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}
 367