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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.  
  41. static char * exctable[] = {
  42.     "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
  43.         "Address Error - load/instr. fetch",
  44.         "Address Error - store",
  45.         "Bus Error - fetch instruction",
  46.         "Bus Error - data reference",
  47.         "Syscall",
  48.         "BreakPoint",
  49.         "Reserved Instruction",
  50.         "Coprocessor Unusable",
  51.         "Arithmetic Overflow",
  52.         "Trap",
  53.         "Virtual Coherency - instruction",
  54.         "Floating Point",
  55.         NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  56.         "WatchHi/WatchLo", /* 23 */
  57.         NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  58.         "Virtual Coherency - data",
  59. };
  60.  
  61. static void print_regdump(struct exception_regdump *pstate)
  62. {
  63.     char *pcsymbol = "";
  64.     char *rasymbol = "";
  65.  
  66.     char *s = get_symtab_entry(pstate->epc);
  67.     if (s)
  68.         pcsymbol = s;
  69.     s = get_symtab_entry(pstate->ra);
  70.     if (s)
  71.         rasymbol = s;
  72.    
  73.     printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,
  74.            pstate->ra,rasymbol);
  75. }
  76.  
  77. static void unhandled_exception(int n, void *data)
  78. {
  79.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  80.  
  81.     print_regdump(pstate);
  82.     panic("unhandled exception %s\n", exctable[n]);
  83. }
  84.  
  85. static void breakpoint_exception(int n, void *data)
  86. {
  87.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  88.     /* it is necessary to not re-execute BREAK instruction after
  89.        returning from Exception handler
  90.        (see page 138 in R4000 Manual for more information) */
  91.     pstate->epc += 4;
  92. }
  93.  
  94. static void tlbmod_exception(int n, void *data)
  95. {
  96.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  97.     tlb_modified(pstate);
  98. }
  99.  
  100. static void tlbinv_exception(int n, void *data)
  101. {
  102.     struct exception_regdump *pstate = (struct exception_regdump *)data;
  103.     tlb_invalid(pstate);
  104. }
  105.  
  106. static void cpuns_exception(int n, void *data)
  107. {
  108.     if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
  109.         scheduler_fpu_lazy_request();
  110.     else
  111.         panic("unhandled Coprocessor Unusable Exception\n");
  112. }
  113.  
  114. static void interrupt_exception(int n, void *pstate)
  115. {
  116.     __u32 cause;
  117.     int i;
  118.    
  119.     /* decode interrupt number and process the interrupt */
  120.     cause = (cp0_cause_read() >> 8) &0xff;
  121.    
  122.     for (i = 0; i < 8; i++)
  123.         if (cause & (1 << i))
  124.             exc_dispatch(i+INT_OFFSET, pstate);
  125. }
  126.  
  127.  
  128. void exception(struct exception_regdump *pstate)
  129. {
  130.     int cause;
  131.     int excno;
  132.     __u32 epc_shift = 0;
  133.  
  134.     ASSERT(CPU != NULL);
  135.  
  136.     /*
  137.      * NOTE ON OPERATION ORDERING
  138.      *
  139.      * On entry, interrupts_disable() must be called before
  140.      * exception bit is cleared.
  141.      */
  142.  
  143.     interrupts_disable();
  144.     cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
  145.                         cp0_status_um_bit));
  146.  
  147.     /* Save pstate so that the threads can access it */
  148.     /* If THREAD->pstate is set, this is nested exception,
  149.      * do not rewrite it
  150.      */
  151.     if (THREAD && !THREAD->pstate)
  152.         THREAD->pstate = pstate;
  153.  
  154.     cause = cp0_cause_read();
  155.     excno = cp0_cause_excno(cause);
  156.     /* Dispatch exception */
  157.     exc_dispatch(excno, pstate);
  158.  
  159.     /* Set to NULL, so that we can still support nested
  160.      * exceptions
  161.      * TODO: We should probably set EXL bit before this command,
  162.      * nesting. On the other hand, if some exception occurs between
  163.      * here and ERET, it won't set anything on the pstate anyway.
  164.      */
  165.     if (THREAD)
  166.         THREAD->pstate = NULL;
  167. }
  168.  
  169. void exception_init(void)
  170. {
  171.     int i;
  172.  
  173.     /* Clear exception table */
  174.     for (i=0;i < IVT_ITEMS; i++)
  175.         exc_register(i, "undef", unhandled_exception);
  176.     exc_register(EXC_Bp, "bkpoint", breakpoint_exception);
  177.     exc_register(EXC_Mod, "tlb_mod", tlbmod_exception);
  178.     exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception);
  179.     exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception);
  180.     exc_register(EXC_Int, "interrupt", interrupt_exception);
  181. #ifdef CONFIG_FPU_LAZY
  182.     exc_register(EXC_CpU, "cpunus", cpuns_exception);
  183. #endif
  184. }
  185.