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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. #include <udebug/udebug.h>
  52.  
  53. static char * exctable[] = {
  54.     "Interrupt",
  55.     "TLB Modified",
  56.     "TLB Invalid",
  57.     "TLB Invalid Store",
  58.     "Address Error - load/instr. fetch",
  59.     "Address Error - store",
  60.     "Bus Error - fetch instruction",
  61.     "Bus Error - data reference",
  62.     "Syscall",
  63.     "BreakPoint",
  64.     "Reserved Instruction",
  65.     "Coprocessor Unusable",
  66.     "Arithmetic Overflow",
  67.     "Trap",
  68.     "Virtual Coherency - instruction",
  69.     "Floating Point",
  70.     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  71.     "WatchHi/WatchLo", /* 23 */
  72.     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  73.     "Virtual Coherency - data",
  74. };
  75.  
  76. static void print_regdump(istate_t *istate)
  77. {
  78.     char *pcsymbol = "";
  79.     char *rasymbol = "";
  80.  
  81.     char *s = get_symtab_entry(istate->epc);
  82.     if (s)
  83.         pcsymbol = s;
  84.     s = get_symtab_entry(istate->ra);
  85.     if (s)
  86.         rasymbol = s;
  87.    
  88.     printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);
  89. }
  90.  
  91. static void unhandled_exception(int n, istate_t *istate)
  92. {
  93.     fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);
  94.    
  95.     print_regdump(istate);
  96.     panic("unhandled exception %s\n", exctable[n]);
  97. }
  98.  
  99. static void reserved_instr_exception(int n, istate_t *istate)
  100. {
  101.     if (*((uint32_t *)istate->epc) == 0x7c03e83b) {
  102.         ASSERT(THREAD);
  103.         istate->epc += 4;
  104.         istate->v1 = istate->k1;
  105.     } else
  106.         unhandled_exception(n, istate);
  107. }
  108.  
  109. static void breakpoint_exception(int n, istate_t *istate)
  110. {
  111. #ifdef CONFIG_UDEBUG
  112.     if (istate_from_uspace(istate)) {
  113.         /* userspace breakpoint */
  114.         udebug_breakpoint_event(0);
  115.         return;
  116.     }
  117. #endif
  118.  
  119. #ifdef CONFIG_DEBUG
  120.     debugger_bpoint(istate);
  121. #else
  122.     /* it is necessary to not re-execute BREAK instruction after
  123.        returning from Exception handler
  124.        (see page 138 in R4000 Manual for more information) */
  125.     istate->epc += 4;
  126. #endif
  127. }
  128.  
  129. static void tlbmod_exception(int n, istate_t *istate)
  130. {
  131.     tlb_modified(istate);
  132. }
  133.  
  134. static void tlbinv_exception(int n, istate_t *istate)
  135. {
  136.     tlb_invalid(istate);
  137. }
  138.  
  139. #ifdef CONFIG_FPU_LAZY
  140. static void cpuns_exception(int n, istate_t *istate)
  141. {
  142.     if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
  143.         scheduler_fpu_lazy_request();
  144.     else {
  145.         fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");
  146.         panic("unhandled Coprocessor Unusable Exception\n");
  147.     }
  148. }
  149. #endif
  150.  
  151. static void interrupt_exception(int n, istate_t *istate)
  152. {
  153.     uint32_t cause;
  154.     int i;
  155.    
  156.     /* decode interrupt number and process the interrupt */
  157.     cause = (cp0_cause_read() >> 8) &0xff;
  158.    
  159.     for (i = 0; i < 8; i++) {
  160.         if (cause & (1 << i)) {
  161.             irq_t *irq = irq_dispatch_and_lock(i);
  162.             if (irq) {
  163.                 /*
  164.                  * The IRQ handler was found.
  165.                  */
  166.                 irq->handler(irq, irq->arg);
  167.                 spinlock_unlock(&irq->lock);
  168.             } else {
  169.                 /*
  170.                  * Spurious interrupt.
  171.                  */
  172. #ifdef CONFIG_DEBUG
  173.                 printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, i);
  174. #endif
  175.             }
  176.         }
  177.     }
  178. }
  179.  
  180. /** Handle syscall userspace call */
  181. static void syscall_exception(int n, istate_t *istate)
  182. {
  183.     panic("Syscall is handled through shortcut");
  184. }
  185.  
  186. void exception_init(void)
  187. {
  188.     int i;
  189.  
  190.     /* Clear exception table */
  191.     for (i = 0; i < IVT_ITEMS; i++)
  192.         exc_register(i, "undef", (iroutine) unhandled_exception);
  193.    
  194.     exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
  195.     exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
  196.     exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
  197.     exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
  198.     exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
  199.     exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
  200. #ifdef CONFIG_FPU_LAZY
  201.     exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
  202. #endif
  203.     exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
  204. }
  205.  
  206. /** @}
  207.  */
  208.