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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 <arch/mm/tlb.h>
  38. #include <panic.h>
  39. #include <arch/cp0.h>
  40. #include <arch/types.h>
  41. #include <arch.h>
  42. #include <debug.h>
  43. #include <proc/thread.h>
  44. #include <symtab.h>
  45. #include <print.h>
  46. #include <interrupt.h>
  47. #include <func.h>
  48. #include <console/kconsole.h>
  49. #include <ddi/irq.h>
  50. #include <arch/debugger.h>
  51.  
  52. static char * exctable[] = {
  53.     "Interrupt",
  54.     "TLB Modified",
  55.     "TLB Invalid",
  56.     "TLB Invalid Store",
  57.     "Address Error - load/instr. fetch",
  58.     "Address Error - store",
  59.     "Bus Error - fetch instruction",
  60.     "Bus Error - data reference",
  61.     "Syscall",
  62.     "BreakPoint",
  63.     "Reserved Instruction",
  64.     "Coprocessor Unusable",
  65.     "Arithmetic Overflow",
  66.     "Trap",
  67.     "Virtual Coherency - instruction",
  68.     "Floating Point",
  69.     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  70.     "WatchHi/WatchLo", /* 23 */
  71.     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  72.     "Virtual Coherency - data",
  73. };
  74.  
  75. static void print_regdump(istate_t *istate)
  76. {
  77.     char *pcsymbol = "";
  78.     char *rasymbol = "";
  79.  
  80.     char *s = get_symtab_entry(istate->epc);
  81.     if (s)
  82.         pcsymbol = s;
  83.     s = get_symtab_entry(istate->ra);
  84.     if (s)
  85.         rasymbol = s;
  86.    
  87.     printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);
  88. }
  89.  
  90. static void unhandled_exception(int n, istate_t *istate)
  91. {
  92.     fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);
  93.    
  94.     print_regdump(istate);
  95.     panic("unhandled exception %s\n", exctable[n]);
  96. }
  97.  
  98. static void reserved_instr_exception(int n, istate_t *istate)
  99. {
  100.     if (*((uint32_t *)istate->epc) == 0x7c03e83b) {
  101.         ASSERT(THREAD);
  102.         istate->epc += 4;
  103.         istate->v1 = istate->k1;
  104.     } else
  105.         unhandled_exception(n, istate);
  106. }
  107.  
  108. static void breakpoint_exception(int n, istate_t *istate)
  109. {
  110.     if (istate_from_uspace(istate)) {
  111.         /* userspace breakpoint */
  112.         udebug_breakpoint_event(0);
  113.         return;
  114.     }
  115.  
  116. #ifdef CONFIG_DEBUG
  117.     debugger_bpoint(istate);
  118. #else
  119.     /* it is necessary to not re-execute BREAK instruction after
  120.        returning from Exception handler
  121.        (see page 138 in R4000 Manual for more information) */
  122.     istate->epc += 4;
  123. #endif
  124. }
  125.  
  126. static void tlbmod_exception(int n, istate_t *istate)
  127. {
  128.     tlb_modified(istate);
  129. }
  130.  
  131. static void tlbinv_exception(int n, istate_t *istate)
  132. {
  133.     tlb_invalid(istate);
  134. }
  135.  
  136. #ifdef CONFIG_FPU_LAZY
  137. static void cpuns_exception(int n, istate_t *istate)
  138. {
  139.     if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
  140.         scheduler_fpu_lazy_request();
  141.     else {
  142.         fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");
  143.         panic("unhandled Coprocessor Unusable Exception\n");
  144.     }
  145. }
  146. #endif
  147.  
  148. static void interrupt_exception(int n, istate_t *istate)
  149. {
  150.     uint32_t cause;
  151.     int i;
  152.    
  153.     /* decode interrupt number and process the interrupt */
  154.     cause = (cp0_cause_read() >> 8) &0xff;
  155.    
  156.     for (i = 0; i < 8; i++) {
  157.         if (cause & (1 << i)) {
  158.             irq_t *irq = irq_dispatch_and_lock(i);
  159.             if (irq) {
  160.                 /*
  161.                  * The IRQ handler was found.
  162.                  */
  163.                 irq->handler(irq, irq->arg);
  164.                 spinlock_unlock(&irq->lock);
  165.             } else {
  166.                 /*
  167.                  * Spurious interrupt.
  168.                  */
  169. #ifdef CONFIG_DEBUG
  170.                 printf("cpu%d: spurious interrupt (inum=%d)\n", CPU->id, i);
  171. #endif
  172.             }
  173.         }
  174.     }
  175. }
  176.  
  177. /** Handle syscall userspace call */
  178. static void syscall_exception(int n, istate_t *istate)
  179. {
  180.     panic("Syscall is handled through shortcut");
  181. }
  182.  
  183. void exception_init(void)
  184. {
  185.     int i;
  186.  
  187.     /* Clear exception table */
  188.     for (i = 0; i < IVT_ITEMS; i++)
  189.         exc_register(i, "undef", (iroutine) unhandled_exception);
  190.    
  191.     exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
  192.     exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
  193.     exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
  194.     exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
  195.     exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
  196.     exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
  197. #ifdef CONFIG_FPU_LAZY
  198.     exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
  199. #endif
  200.     exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
  201. }
  202.  
  203. /** @}
  204.  */
  205.