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