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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. /** @addtogroup mips32 
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/exception.h>
  36. #include <arch/interrupt.h>
  37. #include <panic.h>
  38. #include <arch/cp0.h>
  39. #include <arch/types.h>
  40. #include <arch.h>
  41. #include <debug.h>
  42. #include <proc/thread.h>
  43. #include <symtab.h>
  44. #include <print.h>
  45. #include <interrupt.h>
  46. #include <func.h>
  47. #include <console/kconsole.h>
  48. #include <arch/debugger.h>
  49.  
  50. static char * exctable[] = {
  51.     "Interrupt",
  52.     "TLB Modified",
  53.     "TLB Invalid",
  54.     "TLB Invalid Store",
  55.     "Address Error - load/instr. fetch",
  56.     "Address Error - store",
  57.     "Bus Error - fetch instruction",
  58.     "Bus Error - data reference",
  59.     "Syscall",
  60.     "BreakPoint",
  61.     "Reserved Instruction",
  62.     "Coprocessor Unusable",
  63.     "Arithmetic Overflow",
  64.     "Trap",
  65.     "Virtual Coherency - instruction",
  66.     "Floating Point",
  67.     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  68.     "WatchHi/WatchLo", /* 23 */
  69.     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  70.     "Virtual Coherency - data",
  71. };
  72.  
  73. static void print_regdump(istate_t *istate)
  74. {
  75.     char *pcsymbol = "";
  76.     char *rasymbol = "";
  77.  
  78.     char *s = get_symtab_entry(istate->epc);
  79.     if (s)
  80.         pcsymbol = s;
  81.     s = get_symtab_entry(istate->ra);
  82.     if (s)
  83.         rasymbol = s;
  84.    
  85.     printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);
  86. }
  87.  
  88. static void unhandled_exception(int n, istate_t *istate)
  89. {
  90.     fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);
  91.    
  92.     print_regdump(istate);
  93.     panic("unhandled exception %s\n", exctable[n]);
  94. }
  95.  
  96. static void reserved_instr_exception(int n, istate_t *istate)
  97. {
  98.     if (*((__u32 *)istate->epc) == 0x7c03e83b) {
  99.         ASSERT(THREAD);
  100.         istate->epc += 4;
  101.         istate->v1 = istate->k1;
  102.     } else
  103.         unhandled_exception(n, istate);
  104. }
  105.  
  106. static void breakpoint_exception(int n, istate_t *istate)
  107. {
  108. #ifdef CONFIG_DEBUG
  109.     debugger_bpoint(istate);
  110. #else
  111.     /* it is necessary to not re-execute BREAK instruction after
  112.        returning from Exception handler
  113.        (see page 138 in R4000 Manual for more information) */
  114.     istate->epc += 4;
  115. #endif
  116. }
  117.  
  118. static void tlbmod_exception(int n, istate_t *istate)
  119. {
  120.     tlb_modified(istate);
  121. }
  122.  
  123. static void tlbinv_exception(int n, istate_t *istate)
  124. {
  125.     tlb_invalid(istate);
  126. }
  127.  
  128. #ifdef CONFIG_FPU_LAZY
  129. static void cpuns_exception(int n, istate_t *istate)
  130. {
  131.     if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
  132.         scheduler_fpu_lazy_request();
  133.     else {
  134.         fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");
  135.         panic("unhandled Coprocessor Unusable Exception\n");
  136.     }
  137. }
  138. #endif
  139.  
  140. static void interrupt_exception(int n, istate_t *istate)
  141. {
  142.     __u32 cause;
  143.     int i;
  144.    
  145.     /* decode interrupt number and process the interrupt */
  146.     cause = (cp0_cause_read() >> 8) &0xff;
  147.    
  148.     for (i = 0; i < 8; i++)
  149.         if (cause & (1 << i))
  150.             exc_dispatch(i+INT_OFFSET, istate);
  151. }
  152.  
  153. /** Handle syscall userspace call */
  154. static void syscall_exception(int n, istate_t *istate)
  155. {
  156.     panic("Syscall is handled through shortcut");
  157. }
  158.  
  159. void exception_init(void)
  160. {
  161.     int i;
  162.  
  163.     /* Clear exception table */
  164.     for (i=0;i < IVT_ITEMS; i++)
  165.         exc_register(i, "undef", (iroutine) unhandled_exception);
  166.     exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
  167.     exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
  168.     exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
  169.     exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
  170.     exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
  171.     exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
  172. #ifdef CONFIG_FPU_LAZY
  173.     exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
  174. #endif
  175.     exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
  176. }
  177.  
  178. /** @}
  179.  */
  180.