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  1. /*
  2.  * Copyright (C) 2003-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <arch/exception.h>
  30. #include <arch/interrupt.h>
  31. #include <panic.h>
  32. #include <arch/cp0.h>
  33. #include <arch/types.h>
  34. #include <arch.h>
  35. #include <debug.h>
  36. #include <proc/thread.h>
  37. #include <symtab.h>
  38. #include <print.h>
  39. #include <interrupt.h>
  40. #include <func.h>
  41. #include <console/kconsole.h>
  42.  
  43. static char * exctable[] = {
  44.     "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
  45.         "Address Error - load/instr. fetch",
  46.         "Address Error - store",
  47.         "Bus Error - fetch instruction",
  48.         "Bus Error - data reference",
  49.         "Syscall",
  50.         "BreakPoint",
  51.         "Reserved Instruction",
  52.         "Coprocessor Unusable",
  53.         "Arithmetic Overflow",
  54.         "Trap",
  55.         "Virtual Coherency - instruction",
  56.         "Floating Point",
  57.         NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  58.         "WatchHi/WatchLo", /* 23 */
  59.         NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  60.         "Virtual Coherency - data",
  61. };
  62.  
  63. static void print_regdump(struct exception_regdump *pstate)
  64. {
  65.     char *pcsymbol = "";
  66.     char *rasymbol = "";
  67.  
  68.     char *s = get_symtab_entry(pstate->epc);
  69.     if (s)
  70.         pcsymbol = s;
  71.     s = get_symtab_entry(pstate->ra);
  72.     if (s)
  73.         rasymbol = s;
  74.    
  75.     printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,
  76.            pstate->ra,rasymbol);
  77. }
  78.  
  79. static void unhandled_exception(int n, void *data)
  80. {
  81.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  82.  
  83.     print_regdump(pstate);
  84.     panic("unhandled exception %s\n", exctable[n]);
  85. }
  86.  
  87. static void breakpoint_exception(int n, void *data)
  88. {
  89.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  90.     char *symbol = get_symtab_entry(pstate->epc);
  91.  
  92. #ifdef CONFIG_DEBUG
  93.     printf("***Breakpoint %p in %s.\n", pstate->epc, symbol);
  94.     printf("***Type 'exit' to exit kconsole.\n");
  95.     /* Umm..we should rather set some 'debugstate' here */
  96.     haltstate = 1;
  97.     kconsole("debug");
  98.     haltstate = 0;
  99. #endif
  100.  
  101.     /* it is necessary to not re-execute BREAK instruction after
  102.        returning from Exception handler
  103.        (see page 138 in R4000 Manual for more information) */
  104.     pstate->epc += 4;
  105. }
  106.  
  107. static void tlbmod_exception(int n, void *data)
  108. {
  109.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  110.     tlb_modified(pstate);
  111. }
  112.  
  113. static void tlbinv_exception(int n, void *data)
  114. {
  115.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  116.     tlb_invalid(pstate);
  117. }
  118.  
  119. static void cpuns_exception(int n, void *data)
  120. {
  121.     if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
  122.         scheduler_fpu_lazy_request();
  123.     else
  124.         panic("unhandled Coprocessor Unusable Exception\n");
  125. }
  126.  
  127. static void interrupt_exception(int n, void *pstate)
  128. {
  129.     __u32 cause;
  130.     int i;
  131.    
  132.     /* decode interrupt number and process the interrupt */
  133.     cause = (cp0_cause_read() >> 8) &0xff;
  134.    
  135.     for (i = 0; i < 8; i++)
  136.         if (cause & (1 << i))
  137.             exc_dispatch(i+INT_OFFSET, pstate);
  138. }
  139.  
  140.  
  141. void exception(struct exception_regdump *pstate)
  142. {
  143.     int cause;
  144.     int excno;
  145.  
  146.     ASSERT(CPU != NULL);
  147.  
  148.     /*
  149.      * NOTE ON OPERATION ORDERING
  150.      *
  151.      * On entry, interrupts_disable() must be called before
  152.      * exception bit is cleared.
  153.      */
  154.  
  155.     interrupts_disable();
  156.     cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
  157.                         cp0_status_um_bit));
  158.  
  159.     /* Save pstate so that the threads can access it */
  160.     /* If THREAD->pstate is set, this is nested exception,
  161.      * do not rewrite it
  162.      */
  163.     if (THREAD && !THREAD->pstate)
  164.         THREAD->pstate = pstate;
  165.  
  166.     cause = cp0_cause_read();
  167.     excno = cp0_cause_excno(cause);
  168.     /* Dispatch exception */
  169.     exc_dispatch(excno, pstate);
  170.  
  171.     /* Set to NULL, so that we can still support nested
  172.      * exceptions
  173.      * TODO: We should probably set EXL bit before this command,
  174.      * nesting. On the other hand, if some exception occurs between
  175.      * here and ERET, it won't set anything on the pstate anyway.
  176.      */
  177.     if (THREAD)
  178.         THREAD->pstate = NULL;
  179. }
  180.  
  181. void exception_init(void)
  182. {
  183.     int i;
  184.  
  185.     /* Clear exception table */
  186.     for (i=0;i < IVT_ITEMS; i++)
  187.         exc_register(i, "undef", unhandled_exception);
  188.     exc_register(EXC_Bp, "bkpoint", breakpoint_exception);
  189.     exc_register(EXC_Mod, "tlb_mod", tlbmod_exception);
  190.     exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception);
  191.     exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception);
  192.     exc_register(EXC_Int, "interrupt", interrupt_exception);
  193. #ifdef CONFIG_FPU_LAZY
  194.     exc_register(EXC_CpU, "cpunus", cpuns_exception);
  195. #endif
  196. }
  197.