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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 <print.h>
  45. #include <interrupt.h>
  46. #include <func.h>
  47. #include <ddi/irq.h>
  48. #include <arch/debugger.h>
  49. #include <udebug/udebug.h>
  50. #include <symtab.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, *rasymbol;
  78.  
  79.     pcsymbol = symtab_fmt_name_lookup(istate->epc);
  80.     rasymbol = symtab_fmt_name_lookup(istate->ra);
  81.  
  82.     printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol,
  83.         istate->ra, rasymbol, istate->sp);
  84. }
  85.  
  86. static void unhandled_exception(int n, istate_t *istate)
  87. {
  88.     fault_if_from_uspace(istate, "Unhandled exception %s.", exctable[n]);
  89.    
  90.     print_regdump(istate);
  91.     panic("Unhandled exception %s.", exctable[n]);
  92. }
  93.  
  94. static void reserved_instr_exception(int n, istate_t *istate)
  95. {
  96.     if (*((uint32_t *)istate->epc) == 0x7c03e83b) {
  97.         ASSERT(THREAD);
  98.         istate->epc += 4;
  99.         istate->v1 = istate->k1;
  100.     } else
  101.         unhandled_exception(n, istate);
  102. }
  103.  
  104. static void breakpoint_exception(int n, istate_t *istate)
  105. {
  106. #ifdef CONFIG_UDEBUG
  107.     if (istate_from_uspace(istate)) {
  108.         /* userspace breakpoint */
  109.         udebug_breakpoint_event(0);
  110.         return;
  111.     }
  112. #endif
  113.  
  114. #ifdef CONFIG_DEBUG
  115.     debugger_bpoint(istate);
  116. #else
  117.     /* it is necessary to not re-execute BREAK instruction after
  118.        returning from Exception handler
  119.        (see page 138 in R4000 Manual for more information) */
  120.     istate->epc += 4;
  121. #endif
  122. }
  123.  
  124. static void tlbmod_exception(int n, istate_t *istate)
  125. {
  126.     tlb_modified(istate);
  127. }
  128.  
  129. static void tlbinv_exception(int n, istate_t *istate)
  130. {
  131.     tlb_invalid(istate);
  132. }
  133.  
  134. #ifdef CONFIG_FPU_LAZY
  135. static void cpuns_exception(int n, istate_t *istate)
  136. {
  137.     if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
  138.         scheduler_fpu_lazy_request();
  139.     else {
  140.         fault_if_from_uspace(istate, "Unhandled Coprocessor Unusable Exception.");
  141.         panic("Unhandled Coprocessor Unusable Exception.");
  142.     }
  143. }
  144. #endif
  145.  
  146. static void interrupt_exception(int n, istate_t *istate)
  147. {
  148.     uint32_t cause;
  149.     int i;
  150.    
  151.     /* decode interrupt number and process the interrupt */
  152.     cause = (cp0_cause_read() >> 8) & 0xff;
  153.    
  154.     for (i = 0; i < 8; i++) {
  155.         if (cause & (1 << i)) {
  156.             irq_t *irq = irq_dispatch_and_lock(i);
  157.             if (irq) {
  158.                 /*
  159.                  * The IRQ handler was found.
  160.                  */
  161.                 irq->handler(irq);
  162.                 spinlock_unlock(&irq->lock);
  163.             } else {
  164.                 /*
  165.                  * Spurious interrupt.
  166.                  */
  167. #ifdef CONFIG_DEBUG
  168.                 printf("cpu%u: spurious interrupt (inum=%d)\n",
  169.                     CPU->id, i);
  170. #endif
  171.             }
  172.         }
  173.     }
  174. }
  175.  
  176. /** Handle syscall userspace call */
  177. static void syscall_exception(int n, istate_t *istate)
  178. {
  179.     panic("Syscall is handled through shortcut.");
  180. }
  181.  
  182. void exception_init(void)
  183. {
  184.     int i;
  185.  
  186.     /* Clear exception table */
  187.     for (i = 0; i < IVT_ITEMS; i++)
  188.         exc_register(i, "undef", (iroutine) unhandled_exception);
  189.    
  190.     exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
  191.     exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
  192.     exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
  193.     exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
  194.     exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
  195.     exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
  196. #ifdef CONFIG_FPU_LAZY
  197.     exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
  198. #endif
  199.     exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
  200. }
  201.  
  202. /** @}
  203.  */
  204.