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

   1/*
   2 * File:         arch/blackfin/kernel/traps.c
   3 * Based on:
   4 * Author:       Hamish Macdonald
   5 *
   6 * Created:
   7 * Description:  uses S/W interrupt 15 for the system calls
   8 *
   9 * Modified:
  10 *               Copyright 2004-2006 Analog Devices Inc.
  11 *
  12 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License as published by
  16 * the Free Software Foundation; either version 2 of the License, or
  17 * (at your option) any later version.
  18 *
  19 * This program is distributed in the hope that it will be useful,
  20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 * GNU General Public License for more details.
  23 *
  24 * You should have received a copy of the GNU General Public License
  25 * along with this program; if not, see the file COPYING, or write
  26 * to the Free Software Foundation, Inc.,
  27 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28 */
  29
  30#include <linux/uaccess.h>
  31#include <linux/interrupt.h>
  32#include <linux/module.h>
  33#include <linux/kallsyms.h>
  34#include <linux/fs.h>
  35#include <asm/traps.h>
  36#include <asm/cacheflush.h>
  37#include <asm/blackfin.h>
  38#include <asm/irq_handler.h>
  39#include <asm/trace.h>
  40#include <asm/fixed_code.h>
  41
  42#ifdef CONFIG_KGDB
  43# include <linux/debugger.h>
  44# include <linux/kgdb.h>
  45
  46# define CHK_DEBUGGER_TRAP() \
  47        do { \
  48                CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
  49        } while (0)
  50# define CHK_DEBUGGER_TRAP_MAYBE() \
  51        do { \
  52                if (kgdb_connected) \
  53                        CHK_DEBUGGER_TRAP(); \
  54        } while (0)
  55#else
  56# define CHK_DEBUGGER_TRAP() do { } while (0)
  57# define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  58#endif
  59
  60/* Initiate the event table handler */
  61void __init trap_init(void)
  62{
  63        CSYNC();
  64        bfin_write_EVT3(trap);
  65        CSYNC();
  66}
  67
  68int kstack_depth_to_print = 48;
  69
  70static void decode_address(char *buf, unsigned long address)
  71{
  72        struct vm_list_struct *vml;
  73        struct task_struct *p;
  74        struct mm_struct *mm;
  75        unsigned long flags, offset;
  76        unsigned int in_exception = bfin_read_IPEND() & 0x10;
  77
  78#ifdef CONFIG_KALLSYMS
  79        unsigned long symsize;
  80        const char *symname;
  81        char *modname;
  82        char *delim = ":";
  83        char namebuf[128];
  84
  85        /* look up the address and see if we are in kernel space */
  86        symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  87
  88        if (symname) {
  89                /* yeah! kernel space! */
  90                if (!modname)
  91                        modname = delim = "";
  92                sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
  93                              (void *)address, delim, modname, delim, symname,
  94                              (unsigned long)offset);
  95                return;
  96
  97        }
  98#endif
  99
 100        /* Problem in fixed code section? */
 101        if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 102                sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 103                return;
 104        }
 105
 106        /* Problem somewhere before the kernel start address */
 107        if (address < CONFIG_BOOT_LOAD) {
 108                sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 109                return;
 110        }
 111
 112        /* looks like we're off in user-land, so let's walk all the
 113         * mappings of all our processes and see if we can't be a whee
 114         * bit more specific
 115         */
 116        write_lock_irqsave(&tasklist_lock, flags);
 117        for_each_process(p) {
 118                mm = (in_exception ? p->mm : get_task_mm(p));
 119                if (!mm)
 120                        continue;
 121
 122                vml = mm->context.vmlist;
 123                while (vml) {
 124                        struct vm_area_struct *vma = vml->vma;
 125
 126                        if (address >= vma->vm_start && address < vma->vm_end) {
 127                                char *name = p->comm;
 128                                struct file *file = vma->vm_file;
 129                                if (file) {
 130                                        char _tmpbuf[256];
 131                                        name = d_path(file->f_dentry,
 132                                                      file->f_vfsmnt,
 133                                                      _tmpbuf,
 134                                                      sizeof(_tmpbuf));
 135                                }
 136
 137                                /* FLAT does not have its text aligned to the start of
 138                                 * the map while FDPIC ELF does ...
 139                                 */
 140                                if (current->mm &&
 141                                    (address > current->mm->start_code) &&
 142                                    (address < current->mm->end_code))
 143                                        offset = address - current->mm->start_code;
 144                                else
 145                                        offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 146
 147                                sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 148                                        (void *)address, name, offset);
 149                                if (!in_exception)
 150                                        mmput(mm);
 151                                goto done;
 152                        }
 153
 154                        vml = vml->next;
 155                }
 156                if (!in_exception)
 157                        mmput(mm);
 158        }
 159
 160        /* we were unable to find this address anywhere */
 161        sprintf(buf, "<0x%p> /* unknown address */", (void *)address);
 162
 163done:
 164        write_unlock_irqrestore(&tasklist_lock, flags);
 165}
 166
 167asmlinkage void double_fault_c(struct pt_regs *fp)
 168{
 169        console_verbose();
 170        oops_in_progress = 1;
 171        printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 172        dump_bfin_process(fp);
 173        dump_bfin_mem((void *)fp->retx);
 174        show_regs(fp);
 175        panic("Double Fault - unrecoverable event\n");
 176
 177}
 178
 179asmlinkage void trap_c(struct pt_regs *fp)
 180{
 181#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 182        int j;
 183#endif
 184        int sig = 0;
 185        siginfo_t info;
 186        unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 187
 188        trace_buffer_save(j);
 189
 190        /* Important - be very careful dereferncing pointers - will lead to
 191         * double faults if the stack has become corrupt
 192         */
 193
 194        /* If the fault was caused by a kernel thread, or interrupt handler
 195         * we will kernel panic, so the system reboots.
 196         * If KGDB is enabled, don't set this for kernel breakpoints
 197        */
 198        if ((bfin_read_IPEND() & 0xFFC0)
 199#ifdef CONFIG_KGDB
 200                && trapnr != VEC_EXCPT02
 201#endif
 202        ){
 203                console_verbose();
 204                oops_in_progress = 1;
 205        } else if (current) {
 206                if (current->mm == NULL) {
 207                        console_verbose();
 208                        oops_in_progress = 1;
 209                }
 210        }
 211
 212        /* trap_c() will be called for exceptions. During exceptions
 213         * processing, the pc value should be set with retx value.
 214         * With this change we can cleanup some code in signal.c- TODO
 215         */
 216        fp->orig_pc = fp->retx;
 217        /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 218                trapnr, fp->ipend, fp->pc, fp->retx); */
 219
 220        /* send the appropriate signal to the user program */
 221        switch (trapnr) {
 222
 223        /* This table works in conjuction with the one in ./mach-common/entry.S
 224         * Some exceptions are handled there (in assembly, in exception space)
 225         * Some are handled here, (in C, in interrupt space)
 226         * Some, like CPLB, are handled in both, where the normal path is
 227         * handled in assembly/exception space, and the error path is handled
 228         * here
 229         */
 230
 231        /* 0x00 - Linux Syscall, getting here is an error */
 232        /* 0x01 - userspace gdb breakpoint, handled here */
 233        case VEC_EXCPT01:
 234                info.si_code = TRAP_ILLTRAP;
 235                sig = SIGTRAP;
 236                CHK_DEBUGGER_TRAP_MAYBE();
 237                /* Check if this is a breakpoint in kernel space */
 238                if (fp->ipend & 0xffc0)
 239                        return;
 240                else
 241                        break;
 242#ifdef CONFIG_KGDB
 243        case VEC_EXCPT02 :               /* gdb connection */
 244                info.si_code = TRAP_ILLTRAP;
 245                sig = SIGTRAP;
 246                CHK_DEBUGGER_TRAP();
 247                return;
 248#else
 249        /* 0x02 - User Defined, Caught by default */
 250#endif
 251        /* 0x03 - User Defined, userspace stack overflow */
 252        case VEC_EXCPT03:
 253                info.si_code = SEGV_STACKFLOW;
 254                sig = SIGSEGV;
 255                printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 256                CHK_DEBUGGER_TRAP();
 257                break;
 258        /* 0x04 - User Defined, Caught by default */
 259        /* 0x05 - User Defined, Caught by default */
 260        /* 0x06 - User Defined, Caught by default */
 261        /* 0x07 - User Defined, Caught by default */
 262        /* 0x08 - User Defined, Caught by default */
 263        /* 0x09 - User Defined, Caught by default */
 264        /* 0x0A - User Defined, Caught by default */
 265        /* 0x0B - User Defined, Caught by default */
 266        /* 0x0C - User Defined, Caught by default */
 267        /* 0x0D - User Defined, Caught by default */
 268        /* 0x0E - User Defined, Caught by default */
 269        /* 0x0F - User Defined, Caught by default */
 270        /* 0x10 HW Single step, handled here */
 271        case VEC_STEP:
 272                info.si_code = TRAP_STEP;
 273                sig = SIGTRAP;
 274                CHK_DEBUGGER_TRAP_MAYBE();
 275                /* Check if this is a single step in kernel space */
 276                if (fp->ipend & 0xffc0)
 277                        return;
 278                else
 279                        break;
 280        /* 0x11 - Trace Buffer Full, handled here */
 281        case VEC_OVFLOW:
 282                info.si_code = TRAP_TRACEFLOW;
 283                sig = SIGTRAP;
 284                printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 285                CHK_DEBUGGER_TRAP();
 286                break;
 287        /* 0x12 - Reserved, Caught by default */
 288        /* 0x13 - Reserved, Caught by default */
 289        /* 0x14 - Reserved, Caught by default */
 290        /* 0x15 - Reserved, Caught by default */
 291        /* 0x16 - Reserved, Caught by default */
 292        /* 0x17 - Reserved, Caught by default */
 293        /* 0x18 - Reserved, Caught by default */
 294        /* 0x19 - Reserved, Caught by default */
 295        /* 0x1A - Reserved, Caught by default */
 296        /* 0x1B - Reserved, Caught by default */
 297        /* 0x1C - Reserved, Caught by default */
 298        /* 0x1D - Reserved, Caught by default */
 299        /* 0x1E - Reserved, Caught by default */
 300        /* 0x1F - Reserved, Caught by default */
 301        /* 0x20 - Reserved, Caught by default */
 302        /* 0x21 - Undefined Instruction, handled here */
 303        case VEC_UNDEF_I:
 304                info.si_code = ILL_ILLOPC;
 305                sig = SIGILL;
 306                printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 307                CHK_DEBUGGER_TRAP();
 308                break;
 309        /* 0x22 - Illegal Instruction Combination, handled here */
 310        case VEC_ILGAL_I:
 311                info.si_code = ILL_ILLPARAOP;
 312                sig = SIGILL;
 313                printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 314                CHK_DEBUGGER_TRAP();
 315                break;
 316        /* 0x23 - Data CPLB protection violation, handled here */
 317        case VEC_CPLB_VL:
 318                info.si_code = ILL_CPLB_VI;
 319                sig = SIGBUS;
 320                printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 321                CHK_DEBUGGER_TRAP();
 322                break;
 323        /* 0x24 - Data access misaligned, handled here */
 324        case VEC_MISALI_D:
 325                info.si_code = BUS_ADRALN;
 326                sig = SIGBUS;
 327                printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 328                CHK_DEBUGGER_TRAP();
 329                break;
 330        /* 0x25 - Unrecoverable Event, handled here */
 331        case VEC_UNCOV:
 332                info.si_code = ILL_ILLEXCPT;
 333                sig = SIGILL;
 334                printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 335                CHK_DEBUGGER_TRAP();
 336                break;
 337        /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 338                error case is handled here */
 339        case VEC_CPLB_M:
 340                info.si_code = BUS_ADRALN;
 341                sig = SIGBUS;
 342                printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 343                CHK_DEBUGGER_TRAP();
 344                break;
 345        /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 346        case VEC_CPLB_MHIT:
 347                info.si_code = ILL_CPLB_MULHIT;
 348#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 349                sig = SIGSEGV;
 350                printk(KERN_NOTICE "NULL pointer access (probably)\n");
 351#else
 352                sig = SIGILL;
 353                printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 354#endif
 355                CHK_DEBUGGER_TRAP();
 356                break;
 357        /* 0x28 - Emulation Watchpoint, handled here */
 358        case VEC_WATCH:
 359                info.si_code = TRAP_WATCHPT;
 360                sig = SIGTRAP;
 361                pr_debug(EXC_0x28(KERN_DEBUG));
 362                CHK_DEBUGGER_TRAP_MAYBE();
 363                /* Check if this is a watchpoint in kernel space */
 364                if (fp->ipend & 0xffc0)
 365                        return;
 366                else
 367                        break;
 368#ifdef CONFIG_BF535
 369        /* 0x29 - Instruction fetch access error (535 only) */
 370        case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 371                info.si_code = BUS_OPFETCH;
 372                sig = SIGBUS;
 373                printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 374                CHK_DEBUGGER_TRAP();
 375                break;
 376#else
 377        /* 0x29 - Reserved, Caught by default */
 378#endif
 379        /* 0x2A - Instruction fetch misaligned, handled here */
 380        case VEC_MISALI_I:
 381                info.si_code = BUS_ADRALN;
 382                sig = SIGBUS;
 383                printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 384                CHK_DEBUGGER_TRAP();
 385                break;
 386        /* 0x2B - Instruction CPLB protection violation, handled here */
 387        case VEC_CPLB_I_VL:
 388                info.si_code = ILL_CPLB_VI;
 389                sig = SIGBUS;
 390                printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 391                CHK_DEBUGGER_TRAP();
 392                break;
 393        /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 394        case VEC_CPLB_I_M:
 395                info.si_code = ILL_CPLB_MISS;
 396                sig = SIGBUS;
 397                printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 398                CHK_DEBUGGER_TRAP();
 399                break;
 400        /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 401        case VEC_CPLB_I_MHIT:
 402                info.si_code = ILL_CPLB_MULHIT;
 403#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 404                sig = SIGSEGV;
 405                printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n");
 406#else
 407                sig = SIGILL;
 408                printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 409#endif
 410                CHK_DEBUGGER_TRAP();
 411                break;
 412        /* 0x2E - Illegal use of Supervisor Resource, handled here */
 413        case VEC_ILL_RES:
 414                info.si_code = ILL_PRVOPC;
 415                sig = SIGILL;
 416                printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 417                CHK_DEBUGGER_TRAP();
 418                break;
 419        /* 0x2F - Reserved, Caught by default */
 420        /* 0x30 - Reserved, Caught by default */
 421        /* 0x31 - Reserved, Caught by default */
 422        /* 0x32 - Reserved, Caught by default */
 423        /* 0x33 - Reserved, Caught by default */
 424        /* 0x34 - Reserved, Caught by default */
 425        /* 0x35 - Reserved, Caught by default */
 426        /* 0x36 - Reserved, Caught by default */
 427        /* 0x37 - Reserved, Caught by default */
 428        /* 0x38 - Reserved, Caught by default */
 429        /* 0x39 - Reserved, Caught by default */
 430        /* 0x3A - Reserved, Caught by default */
 431        /* 0x3B - Reserved, Caught by default */
 432        /* 0x3C - Reserved, Caught by default */
 433        /* 0x3D - Reserved, Caught by default */
 434        /* 0x3E - Reserved, Caught by default */
 435        /* 0x3F - Reserved, Caught by default */
 436        default:
 437                info.si_code = TRAP_ILLTRAP;
 438                sig = SIGTRAP;
 439                printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 440                        (fp->seqstat & SEQSTAT_EXCAUSE));
 441                CHK_DEBUGGER_TRAP();
 442                break;
 443        }
 444
 445        BUG_ON(sig == 0);
 446
 447        if (sig != SIGTRAP) {
 448                unsigned long stack;
 449                dump_bfin_process(fp);
 450                dump_bfin_mem((void *)fp->retx);
 451                show_regs(fp);
 452
 453                /* Print out the trace buffer if it makes sense */
 454#ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 455                if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 456                        printk(KERN_NOTICE "No trace since you do not have "
 457                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 458                                KERN_NOTICE "\n");
 459                else
 460#endif
 461                        dump_bfin_trace_buffer();
 462                show_stack(current, &stack);
 463                if (oops_in_progress) {
 464#ifndef CONFIG_ACCESS_CHECK
 465                        printk(KERN_EMERG "Please turn on "
 466                               "CONFIG_ACCESS_CHECK\n");
 467#endif
 468                        panic("Kernel exception");
 469                }
 470        }
 471
 472        info.si_signo = sig;
 473        info.si_errno = 0;
 474        info.si_addr = (void *)fp->pc;
 475        force_sig_info(sig, &info, current);
 476
 477        /* Ensure that bad return addresses don't end up in an infinite
 478         * loop, due to speculative loads/reads. This needs to be done after
 479         * the signal has been sent.
 480         */
 481        if (trapnr == VEC_CPLB_I_M && sig != SIGTRAP)
 482                fp->pc = SAFE_USER_INSTRUCTION;
 483
 484        trace_buffer_restore(j);
 485        return;
 486}
 487
 488/* Typical exception handling routines  */
 489
 490#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 491
 492void dump_bfin_trace_buffer(void)
 493{
 494#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 495        int tflags, i = 0;
 496        char buf[150];
 497#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 498        int j, index;
 499#endif
 500
 501        trace_buffer_save(tflags);
 502
 503        printk(KERN_NOTICE "Hardware Trace:\n");
 504
 505        if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 506                for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 507                        decode_address(buf, (unsigned long)bfin_read_TBUF());
 508                        printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 509                        decode_address(buf, (unsigned long)bfin_read_TBUF());
 510                        printk(KERN_NOTICE "     Source : %s\n", buf);
 511                }
 512        }
 513
 514#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 515        if (trace_buff_offset)
 516                index = trace_buff_offset/4 - 1;
 517        else
 518                index = EXPAND_LEN;
 519
 520        j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 521        while (j) {
 522                decode_address(buf, software_trace_buff[index]);
 523                printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 524                index -= 1;
 525                if (index < 0 )
 526                        index = EXPAND_LEN;
 527                decode_address(buf, software_trace_buff[index]);
 528                printk(KERN_NOTICE "     Source : %s\n", buf);
 529                index -= 1;
 530                if (index < 0)
 531                        index = EXPAND_LEN;
 532                j--;
 533                i++;
 534        }
 535#endif
 536
 537        trace_buffer_restore(tflags);
 538#endif
 539}
 540EXPORT_SYMBOL(dump_bfin_trace_buffer);
 541
 542static void show_trace(struct task_struct *tsk, unsigned long *sp)
 543{
 544        unsigned long addr;
 545
 546        printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
 547
 548        while (!kstack_end(sp)) {
 549                addr = *sp++;
 550                /*
 551                 * If the address is either in the text segment of the
 552                 * kernel, or in the region which contains vmalloc'ed
 553                 * memory, it *may* be the address of a calling
 554                 * routine; if so, print it so that someone tracing
 555                 * down the cause of the crash will be able to figure
 556                 * out the call path that was taken.
 557                 */
 558                if (kernel_text_address(addr))
 559                        print_ip_sym(addr);
 560        }
 561
 562        printk(KERN_NOTICE "\n");
 563}
 564
 565void show_stack(struct task_struct *task, unsigned long *stack)
 566{
 567        unsigned long *endstack, addr;
 568        int i;
 569
 570        /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 571         * called externally in some places in the kernel.
 572         */
 573
 574        if (!stack) {
 575                if (task)
 576                        stack = (unsigned long *)task->thread.ksp;
 577                else
 578                        stack = (unsigned long *)&stack;
 579        }
 580
 581        addr = (unsigned long)stack;
 582        endstack = (unsigned long *)PAGE_ALIGN(addr);
 583
 584        printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
 585        for (i = 0; i < kstack_depth_to_print; i++) {
 586                if (stack + 1 > endstack)
 587                        break;
 588                if (i % 8 == 0)
 589                        printk("\n" KERN_NOTICE "       ");
 590                printk(" %08lx", *stack++);
 591        }
 592        printk("\n");
 593
 594        show_trace(task, stack);
 595}
 596
 597void dump_stack(void)
 598{
 599        unsigned long stack;
 600#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 601        int tflags;
 602#endif
 603        trace_buffer_save(tflags);
 604        dump_bfin_trace_buffer();
 605        show_stack(current, &stack);
 606        trace_buffer_restore(tflags);
 607}
 608EXPORT_SYMBOL(dump_stack);
 609
 610void dump_bfin_process(struct pt_regs *fp)
 611{
 612        /* We should be able to look at fp->ipend, but we don't push it on the
 613         * stack all the time, so do this until we fix that */
 614        unsigned int context = bfin_read_IPEND();
 615
 616        if (oops_in_progress)
 617                printk(KERN_EMERG "Kernel OOPS in progress\n");
 618
 619        if (context & 0x0020)
 620                printk(KERN_NOTICE "Deferred excecption or HW Error context\n");
 621        else if (context & 0x3FC0)
 622                printk(KERN_NOTICE "Interrupt context\n");
 623        else if (context & 0x4000)
 624                printk(KERN_NOTICE "Deferred Interrupt context\n");
 625        else if (context & 0x8000)
 626                printk(KERN_NOTICE "Kernel process context\n");
 627
 628        if (current->pid && current->mm) {
 629                printk(KERN_NOTICE "CURRENT PROCESS:\n");
 630                printk(KERN_NOTICE "COMM=%s PID=%d\n",
 631                        current->comm, current->pid);
 632
 633                printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 634                        KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 635                        KERN_NOTICE "\n",
 636                        (void *)current->mm->start_code,
 637                        (void *)current->mm->end_code,
 638                        (void *)current->mm->start_data,
 639                        (void *)current->mm->end_data,
 640                        (void *)current->mm->end_data,
 641                        (void *)current->mm->brk,
 642                        (void *)current->mm->start_stack);
 643        } else
 644                printk(KERN_NOTICE "\n" KERN_NOTICE
 645                     "No Valid process in current context\n");
 646}
 647
 648void dump_bfin_mem(void *retaddr)
 649{
 650
 651        if (retaddr >= (void *)FIXED_CODE_START  && retaddr < (void *)physical_mem_end
 652#if L1_CODE_LENGTH != 0
 653            /* FIXME: Copy the code out of L1 Instruction SRAM through dma
 654               memcpy.  */
 655            && !(retaddr >= (void *)L1_CODE_START
 656                 && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
 657#endif
 658        ) {
 659                int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
 660                unsigned short x = 0;
 661                printk(KERN_NOTICE "return address: [0x%p]; contents of:", retaddr);
 662                for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
 663                        if (!(i & 0xF))
 664                                printk("\n" KERN_NOTICE "0x%08x: ", i);
 665
 666                        if (get_user(x, (unsigned short *)i))
 667                                break;
 668#ifndef CONFIG_DEBUG_HWERR
 669                        /* If one of the last few instructions was a STI
 670                         * it is likely that the error occured awhile ago
 671                         * and we just noticed. This only happens in kernel
 672                         * context, which should mean an oops is happening
 673                         */
 674                        if (oops_in_progress && x >= 0x0040 && x <= 0x0047 && i <= 0)
 675                                panic("\n\nWARNING : You should reconfigure"
 676                                        " the kernel to turn on\n"
 677                                        " 'Hardware error interrupt"
 678                                        " debugging'\n"
 679                                        " The rest of this error"
 680                                        " is meanless\n");
 681#endif
 682                        if (i == (unsigned int)retaddr)
 683                                printk("[%04x]", x);
 684                        else
 685                                printk(" %04x ", x);
 686                }
 687                printk("\n");
 688        } else
 689                printk("\n" KERN_NOTICE
 690                        "Cannot look at the [PC] <%p> for it is"
 691                        " in unreadable memory - sorry\n", retaddr);
 692}
 693
 694void show_regs(struct pt_regs *fp)
 695{
 696        char buf [150];
 697
 698        printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\n");
 699        printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 700                (long)fp->seqstat, fp->ipend, fp->syscfg);
 701
 702        decode_address(buf, fp->rete);
 703        printk(KERN_NOTICE " RETE: %s\n", buf);
 704        decode_address(buf, fp->retn);
 705        printk(KERN_NOTICE " RETN: %s\n", buf);
 706        decode_address(buf, fp->retx);
 707        printk(KERN_NOTICE " RETX: %s\n", buf);
 708        decode_address(buf, fp->rets);
 709        printk(KERN_NOTICE " RETS: %s\n", buf);
 710        decode_address(buf, fp->pc);
 711        printk(KERN_NOTICE " PC: %s\n", buf);
 712
 713        if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
 714                decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
 715                printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
 716                decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
 717                printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
 718        }
 719
 720        printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
 721        printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
 722                fp->r0, fp->r1, fp->r2, fp->r3);
 723        printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
 724                fp->r4, fp->r5, fp->r6, fp->r7);
 725        printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
 726                fp->p0, fp->p1, fp->p2, fp->p3);
 727        printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
 728                fp->p4, fp->p5, fp->fp, (long)fp);
 729        printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
 730                fp->lb0, fp->lt0, fp->lc0);
 731        printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
 732                fp->lb1, fp->lt1, fp->lc1);
 733        printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
 734                fp->b0, fp->l0, fp->m0, fp->i0);
 735        printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
 736                fp->b1, fp->l1, fp->m1, fp->i1);
 737        printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
 738                fp->b2, fp->l2, fp->m2, fp->i2);
 739        printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
 740                fp->b3, fp->l3, fp->m3, fp->i3);
 741        printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
 742                fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 743
 744        printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
 745                rdusp(), fp->astat);
 746
 747        printk(KERN_NOTICE "\n");
 748}
 749
 750#ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 751asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 752#endif
 753
 754asmlinkage int sys_bfin_spinlock(int *spinlock)
 755{
 756        int ret = 0;
 757        int tmp = 0;
 758
 759        local_irq_disable();
 760        ret = get_user(tmp, spinlock);
 761        if (ret == 0) {
 762                if (tmp)
 763                        ret = 1;
 764                tmp = 1;
 765                put_user(tmp, spinlock);
 766        }
 767        local_irq_enable();
 768        return ret;
 769}
 770
 771int bfin_request_exception(unsigned int exception, void (*handler)(void))
 772{
 773        void (*curr_handler)(void);
 774
 775        if (exception > 0x3F)
 776                return -EINVAL;
 777
 778        curr_handler = ex_table[exception];
 779
 780        if (curr_handler != ex_replaceable)
 781                return -EBUSY;
 782
 783        ex_table[exception] = handler;
 784
 785        return 0;
 786}
 787EXPORT_SYMBOL(bfin_request_exception);
 788
 789int bfin_free_exception(unsigned int exception, void (*handler)(void))
 790{
 791        void (*curr_handler)(void);
 792
 793        if (exception > 0x3F)
 794                return -EINVAL;
 795
 796        curr_handler = ex_table[exception];
 797
 798        if (curr_handler != handler)
 799                return -EBUSY;
 800
 801        ex_table[exception] = ex_replaceable;
 802
 803        return 0;
 804}
 805EXPORT_SYMBOL(bfin_free_exception);
 806
 807void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 808{
 809        switch (cplb_panic) {
 810        case CPLB_NO_UNLOCKED:
 811                printk(KERN_EMERG "All CPLBs are locked\n");
 812                break;
 813        case CPLB_PROT_VIOL:
 814                return;
 815        case CPLB_NO_ADDR_MATCH:
 816                return;
 817        case CPLB_UNKNOWN_ERR:
 818                printk(KERN_EMERG "Unknown CPLB Exception\n");
 819                break;
 820        }
 821
 822        oops_in_progress = 1;
 823
 824        printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 825        printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 826        dump_bfin_process(fp);
 827        dump_bfin_mem((void *)fp->retx);
 828        show_regs(fp);
 829        dump_stack();
 830        panic("Unrecoverable event\n");
 831}
 832