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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. #include <arch/debugger.h>
  43.  
  44. static char * exctable[] = {
  45.     "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
  46.         "Address Error - load/instr. fetch",
  47.         "Address Error - store",
  48.         "Bus Error - fetch instruction",
  49.         "Bus Error - data reference",
  50.         "Syscall",
  51.         "BreakPoint",
  52.         "Reserved Instruction",
  53.         "Coprocessor Unusable",
  54.         "Arithmetic Overflow",
  55.         "Trap",
  56.         "Virtual Coherency - instruction",
  57.         "Floating Point",
  58.         NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  59.         "WatchHi/WatchLo", /* 23 */
  60.         NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  61.         "Virtual Coherency - data",
  62. };
  63.  
  64. static void print_regdump(istate_t *istate)
  65. {
  66.     char *pcsymbol = "";
  67.     char *rasymbol = "";
  68.  
  69.     char *s = get_symtab_entry(istate->epc);
  70.     if (s)
  71.         pcsymbol = s;
  72.     s = get_symtab_entry(istate->ra);
  73.     if (s)
  74.         rasymbol = s;
  75.    
  76.     printf("PC: %X(%s) RA: %X(%s), SP(%P)\n",istate->epc,pcsymbol,
  77.            istate->ra,rasymbol, istate->sp);
  78. }
  79.  
  80. static void unhandled_exception(int n, istate_t *istate)
  81. {
  82.     print_regdump(istate);
  83.     panic("unhandled exception %s\n", exctable[n]);
  84. }
  85.  
  86. static void reserved_instr_exception(int n, istate_t *istate)
  87. {
  88.     if (*((__u32 *)istate->epc) == 0x7c03e83b) {
  89.         ASSERT(THREAD);
  90.         istate->epc += 4;
  91.         istate->v1 = istate->k1;
  92.     } else {
  93.         print_regdump(istate);
  94.         panic("reserved instruction");
  95.     }
  96. }
  97.  
  98. static void breakpoint_exception(int n, istate_t *istate)
  99. {
  100. #ifdef CONFIG_DEBUG
  101.     debugger_bpoint(istate);
  102. #else
  103.     /* it is necessary to not re-execute BREAK instruction after
  104.        returning from Exception handler
  105.        (see page 138 in R4000 Manual for more information) */
  106.     istate->epc += 4;
  107. #endif
  108. }
  109.  
  110. static void tlbmod_exception(int n, istate_t *istate)
  111. {
  112.     tlb_modified(istate);
  113. }
  114.  
  115. static void tlbinv_exception(int n, istate_t *istate)
  116. {
  117.     tlb_invalid(istate);
  118. }
  119.  
  120. #ifdef CONFIG_FPU_LAZY
  121. static void cpuns_exception(int n, istate_t *istate)
  122. {
  123.     if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
  124.         scheduler_fpu_lazy_request();
  125.     else
  126.         panic("unhandled Coprocessor Unusable Exception\n");
  127. }
  128. #endif
  129.  
  130. static void interrupt_exception(int n, istate_t *istate)
  131. {
  132.     __u32 cause;
  133.     int i;
  134.    
  135.     /* decode interrupt number and process the interrupt */
  136.     cause = (cp0_cause_read() >> 8) &0xff;
  137.    
  138.     for (i = 0; i < 8; i++)
  139.         if (cause & (1 << i))
  140.             exc_dispatch(i+INT_OFFSET, istate);
  141. }
  142.  
  143. /** Handle syscall userspace call */
  144. static void syscall_exception(int n, istate_t *istate)
  145. {
  146.     panic("Syscall is handled through shortcut");
  147. }
  148.  
  149. void exception_init(void)
  150. {
  151.     int i;
  152.  
  153.     /* Clear exception table */
  154.     for (i=0;i < IVT_ITEMS; i++)
  155.         exc_register(i, "undef", (iroutine) unhandled_exception);
  156.     exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
  157.     exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
  158.     exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
  159.     exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
  160.     exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
  161.     exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
  162. #ifdef CONFIG_FPU_LAZY
  163.     exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
  164. #endif
  165.     exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
  166. }
  167.