LXR linux/arch/c6x/kernel/traps.c

   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/sched/debug.h>
  14#include <linux/kallsyms.h>
  15#include <linux/bug.h>
  16
  17#include <asm/soc.h>
  18#include <asm/special_insns.h>
  19#include <asm/traps.h>
  20
  21int (*c6x_nmi_handler)(struct pt_regs *regs);
  22
  23void __init trap_init(void)
  24{
  25        ack_exception(EXCEPT_TYPE_NXF);
  26        ack_exception(EXCEPT_TYPE_EXC);
  27        ack_exception(EXCEPT_TYPE_IXF);
  28        ack_exception(EXCEPT_TYPE_SXF);
  29        enable_exception();
  30}
  31
  32void show_regs(struct pt_regs *regs)
  33{
  34        pr_err("\n");
  35        show_regs_print_info(KERN_ERR);
  36        pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
  37        pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
  38        pr_err("A0: %08lx  B0: %08lx\n", regs->a0, regs->b0);
  39        pr_err("A1: %08lx  B1: %08lx\n", regs->a1, regs->b1);
  40        pr_err("A2: %08lx  B2: %08lx\n", regs->a2, regs->b2);
  41        pr_err("A3: %08lx  B3: %08lx\n", regs->a3, regs->b3);
  42        pr_err("A4: %08lx  B4: %08lx\n", regs->a4, regs->b4);
  43        pr_err("A5: %08lx  B5: %08lx\n", regs->a5, regs->b5);
  44        pr_err("A6: %08lx  B6: %08lx\n", regs->a6, regs->b6);
  45        pr_err("A7: %08lx  B7: %08lx\n", regs->a7, regs->b7);
  46        pr_err("A8: %08lx  B8: %08lx\n", regs->a8, regs->b8);
  47        pr_err("A9: %08lx  B9: %08lx\n", regs->a9, regs->b9);
  48        pr_err("A10: %08lx  B10: %08lx\n", regs->a10, regs->b10);
  49        pr_err("A11: %08lx  B11: %08lx\n", regs->a11, regs->b11);
  50        pr_err("A12: %08lx  B12: %08lx\n", regs->a12, regs->b12);
  51        pr_err("A13: %08lx  B13: %08lx\n", regs->a13, regs->b13);
  52        pr_err("A14: %08lx  B14: %08lx\n", regs->a14, regs->dp);
  53        pr_err("A15: %08lx  B15: %08lx\n", regs->a15, regs->sp);
  54        pr_err("A16: %08lx  B16: %08lx\n", regs->a16, regs->b16);
  55        pr_err("A17: %08lx  B17: %08lx\n", regs->a17, regs->b17);
  56        pr_err("A18: %08lx  B18: %08lx\n", regs->a18, regs->b18);
  57        pr_err("A19: %08lx  B19: %08lx\n", regs->a19, regs->b19);
  58        pr_err("A20: %08lx  B20: %08lx\n", regs->a20, regs->b20);
  59        pr_err("A21: %08lx  B21: %08lx\n", regs->a21, regs->b21);
  60        pr_err("A22: %08lx  B22: %08lx\n", regs->a22, regs->b22);
  61        pr_err("A23: %08lx  B23: %08lx\n", regs->a23, regs->b23);
  62        pr_err("A24: %08lx  B24: %08lx\n", regs->a24, regs->b24);
  63        pr_err("A25: %08lx  B25: %08lx\n", regs->a25, regs->b25);
  64        pr_err("A26: %08lx  B26: %08lx\n", regs->a26, regs->b26);
  65        pr_err("A27: %08lx  B27: %08lx\n", regs->a27, regs->b27);
  66        pr_err("A28: %08lx  B28: %08lx\n", regs->a28, regs->b28);
  67        pr_err("A29: %08lx  B29: %08lx\n", regs->a29, regs->b29);
  68        pr_err("A30: %08lx  B30: %08lx\n", regs->a30, regs->b30);
  69        pr_err("A31: %08lx  B31: %08lx\n", regs->a31, regs->b31);
  70}
  71
  72void die(char *str, struct pt_regs *fp, int nr)
  73{
  74        console_verbose();
  75        pr_err("%s: %08x\n", str, nr);
  76        show_regs(fp);
  77
  78        pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
  79               current->comm, current->pid, (PAGE_SIZE +
  80                                             (unsigned long) current));
  81
  82        dump_stack();
  83        while (1)
  84                ;
  85}
  86
  87static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
  88{
  89        if (user_mode(fp))
  90                return;
  91
  92        die(str, fp, nr);
  93}
  94
  95
  96/* Internal exceptions */
  97static struct exception_info iexcept_table[10] = {
  98        { "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
  99        { "Oops - fetch packet", SIGBUS, BUS_ADRERR },
 100        { "Oops - execute packet", SIGILL, ILL_ILLOPC },
 101        { "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
 102        { "Oops - resource conflict", SIGILL, ILL_ILLOPC },
 103        { "Oops - resource access", SIGILL, ILL_PRVREG },
 104        { "Oops - privilege", SIGILL, ILL_PRVOPC },
 105        { "Oops - loops buffer", SIGILL, ILL_ILLOPC },
 106        { "Oops - software exception", SIGILL, ILL_ILLTRP },
 107        { "Oops - unknown exception", SIGILL, ILL_ILLOPC }
 108};
 109
 110/* External exceptions */
 111static struct exception_info eexcept_table[128] = {
 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        { "Oops - external exception", SIGBUS, BUS_ADRERR },
 144
 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        { "Oops - external exception", SIGBUS, BUS_ADRERR },
 177
 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        { "Oops - external exception", SIGBUS, BUS_ADRERR },
 210
 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 - external exception", SIGBUS, BUS_ADRERR },
 234        { "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
 235        { "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
 236        { "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
 237        { "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
 238        { "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
 239        { "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
 240        { "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
 241        { "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
 242        { "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
 243};
 244
 245static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
 246{
 247        unsigned long addr = instruction_pointer(regs);
 248        siginfo_t info;
 249
 250        if (except_info->code != TRAP_BRKPT)
 251                pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
 252                       except_info->kernel_str, regs->pc,
 253                       except_info->signo, except_info->code);
 254
 255        die_if_kernel(except_info->kernel_str, regs, addr);
 256
 257        info.si_signo = except_info->signo;
 258        info.si_errno = 0;
 259        info.si_code  = except_info->code;
 260        info.si_addr  = (void __user *)addr;
 261
 262        force_sig_info(except_info->signo, &info, current);
 263}
 264
 265/*
 266 * Process an internal exception (non maskable)
 267 */
 268static int process_iexcept(struct pt_regs *regs)
 269{
 270        unsigned int iexcept_report = get_iexcept();
 271        unsigned int iexcept_num;
 272
 273        ack_exception(EXCEPT_TYPE_IXF);
 274
 275        pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
 276
 277        while (iexcept_report) {
 278                iexcept_num = __ffs(iexcept_report);
 279                iexcept_report &= ~(1 << iexcept_num);
 280                set_iexcept(iexcept_report);
 281                if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
 282                        /* This is a breakpoint */
 283                        struct exception_info bkpt_exception = {
 284                                "Oops - undefined instruction",
 285                                  SIGTRAP, TRAP_BRKPT
 286                        };
 287                        do_trap(&bkpt_exception, regs);
 288                        iexcept_report &= ~(0xFF);
 289                        set_iexcept(iexcept_report);
 290                        continue;
 291                }
 292
 293                do_trap(&iexcept_table[iexcept_num], regs);
 294        }
 295        return 0;
 296}
 297
 298/*
 299 * Process an external exception (maskable)
 300 */
 301static void process_eexcept(struct pt_regs *regs)
 302{
 303        int evt;
 304
 305        pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
 306
 307        while ((evt = soc_get_exception()) >= 0)
 308                do_trap(&eexcept_table[evt], regs);
 309
 310        ack_exception(EXCEPT_TYPE_EXC);
 311}
 312
 313/*
 314 * Main exception processing
 315 */
 316asmlinkage int process_exception(struct pt_regs *regs)
 317{
 318        unsigned int type;
 319        unsigned int type_num;
 320        unsigned int ie_num = 9; /* default is unknown exception */
 321
 322        while ((type = get_except_type()) != 0) {
 323                type_num = fls(type) - 1;
 324
 325                switch (type_num) {
 326                case EXCEPT_TYPE_NXF:
 327                        ack_exception(EXCEPT_TYPE_NXF);
 328                        if (c6x_nmi_handler)
 329                                (c6x_nmi_handler)(regs);
 330                        else
 331                                pr_alert("NMI interrupt!\n");
 332                        break;
 333
 334                case EXCEPT_TYPE_IXF:
 335                        if (process_iexcept(regs))
 336                                return 1;
 337                        break;
 338
 339                case EXCEPT_TYPE_EXC:
 340                        process_eexcept(regs);
 341                        break;
 342
 343                case EXCEPT_TYPE_SXF:
 344                        ie_num = 8;
 345                default:
 346                        ack_exception(type_num);
 347                        do_trap(&iexcept_table[ie_num], regs);
 348                        break;
 349                }
 350        }
 351        return 0;
 352}
 353
 354static int kstack_depth_to_print = 48;
 355
 356static void show_trace(unsigned long *stack, unsigned long *endstack)
 357{
 358        unsigned long addr;
 359        int i;
 360
 361        pr_debug("Call trace:");
 362        i = 0;
 363        while (stack + 1 <= endstack) {
 364                addr = *stack++;
 365                /*
 366                 * If the address is either in the text segment of the
 367                 * kernel, or in the region which contains vmalloc'ed
 368                 * memory, it *may* be the address of a calling
 369                 * routine; if so, print it so that someone tracing
 370                 * down the cause of the crash will be able to figure
 371                 * out the call path that was taken.
 372                 */
 373                if (__kernel_text_address(addr)) {
 374#ifndef CONFIG_KALLSYMS
 375                        if (i % 5 == 0)
 376                                pr_debug("\n        ");
 377#endif
 378                        pr_debug(" [<%08lx>]", addr);
 379                        print_symbol(" %s\n", addr);
 380                        i++;
 381                }
 382        }
 383        pr_debug("\n");
 384}
 385
 386void show_stack(struct task_struct *task, unsigned long *stack)
 387{
 388        unsigned long *p, *endstack;
 389        int i;
 390
 391        if (!stack) {
 392                if (task && task != current)
 393                        /* We know this is a kernel stack,
 394                           so this is the start/end */
 395                        stack = (unsigned long *)thread_saved_ksp(task);
 396                else
 397                        stack = (unsigned long *)&stack;
 398        }
 399        endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
 400                                     & -THREAD_SIZE);
 401
 402        pr_debug("Stack from %08lx:", (unsigned long)stack);
 403        for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
 404                if (p + 1 > endstack)
 405                        break;
 406                if (i % 8 == 0)
 407                        pr_cont("\n         ");
 408                pr_cont(" %08lx", *p++);
 409        }
 410        pr_cont("\n");
 411        show_trace(stack, endstack);
 412}
 413
 414int is_valid_bugaddr(unsigned long addr)
 415{
 416        return __kernel_text_address(addr);
 417}
 418