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/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
  20int (*c6x_nmi_handler)(struct pt_regs *regs);
  21
  22void __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
  31void 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
  71void 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
  86static 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 */
  96static 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 */
 110static 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
 244static 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 */
 267static 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 */
 300static 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 */
 315asmlinkage 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
 353static int kstack_depth_to_print = 48;
 354
 355static 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
 385void 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
 413int is_valid_bugaddr(unsigned long addr)
 414{
 415        return __kernel_text_address(addr);
 416}
 417