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/*
* File : mips_excpt.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2016��9��7�� Urey the first version
*/
#include <rtthread.h>
#include <rthw.h>
#include <stdio.h>
#include "mips.h"
#include "mips_excpt.h"
extern int backtrace(void);
int backtrace_ctx(mips_reg_ctx *ctx);
extern long list_thread(void);
const static char *regstr[] = {
"$0 zero", "$1 at", "$2 v0", "$3 v1", "$4 a0", "$5 a1", "$6 a2", "$7 a3",
"$8 t0", "$9 t1", "$10 t2", "$11 t3", "$12 t4", "$13 t5", "$14 t6", "$15 t7",
"$16 s0", "$17 s1", "$18 s2", "$19 s3", "$20 s4", "$21 s5", "$22 s6", "$23 s7",
"$24 t8", "$25 t9", "$26 k0", "$27 k1", "$28 gp", "$29 sp", "$30 fp", "$31 ra"
};
static const char *cause_strings[32] =
{
/* 0 */ "Int",
/* 1 */ "TLB Mods",
/* 2 */ "TLB Load",
/* 3 */ "TLB Store",
/* 4 */ "Address Load",
/* 5 */ "Address Store",
/* 6 */ "Instruction Bus Error",
/* 7 */ "Data Bus Error",
/* 8 */ "Syscall",
/* 9 */ "Breakpoint",
/* 10 */ "Reserved Instruction",
/* 11 */ "Coprocessor Unuseable",
/* 12 */ "Overflow",
/* 13 */ "Trap",
/* 14 */ "Instruction Virtual Coherency Error",
/* 15 */ "FP Exception",
/* 16 */ "Reserved 16",
/* 17 */ "Reserved 17",
/* 18 */ "Reserved 18",
/* 19 */ "Reserved 19",
/* 20 */ "Reserved 20",
/* 21 */ "Reserved 21",
/* 22 */ "Reserved 22",
/* 23 */ "Watch",
/* 24 */ "Reserved 24",
/* 25 */ "Reserved 25",
/* 26 */ "Reserved 26",
/* 27 */ "Reserved 27",
/* 28 */ "Reserved 28",
/* 29 */ "Reserved 29",
/* 30 */ "Reserved 30",
/* 31 */ "Data Virtual Coherency Error"
};
/**
* exception handle table
*/
exception_func_t sys_exception_handlers[32];
static void mod_handler(mips_reg_ctx *regs)
{
rt_kprintf("tlb modification exception\n");
rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
list_thread();
printf("-----------------------------------------------------\n");
printf("BACKTRACE:\n");
backtrace();
printf("-----------------------------------------------------\n");
rt_hw_cpu_shutdown();
}
static void tlbl_handler(mips_reg_ctx *regs)
{
rt_kprintf("tlb exception: load\n");
rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
list_thread();
printf("-----------------------------------------------------\n");
printf("BACKTRACE:\n");
backtrace();
printf("-----------------------------------------------------\n");
rt_hw_cpu_shutdown();
}
static void tlbs_handler(mips_reg_ctx *regs)
{
rt_kprintf("tlb exception: store\n");
rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
list_thread();
printf("-----------------------------------------------------\n");
printf("BACKTRACE:\n");
backtrace();
printf("-----------------------------------------------------\n");
rt_hw_cpu_shutdown();
}
static void adel_handler(mips_reg_ctx *regs)
{
rt_kprintf("address error exception: load\n");
rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
list_thread();
rt_kprintf("current thread: %.*s\n", RT_NAME_MAX, rt_thread_self()->name);
printf("-----------------------------------------------------\n");
printf("BACKTRACE:\n");
backtrace();
printf("-----------------------------------------------------\n");
rt_hw_cpu_shutdown();
}
static void ades_handler(mips_reg_ctx *regs)
{
rt_kprintf("address error exception: store\n");
rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
list_thread();
printf("-----------------------------------------------------\n");
printf("BACKTRACE:\n");
backtrace();
printf("-----------------------------------------------------\n");
rt_hw_cpu_shutdown();
}
static void fpe_handler(mips_reg_ctx *regs)
{
rt_kprintf("floating point exception\n");
rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
list_thread();
printf("-----------------------------------------------------\n");
printf("BACKTRACE:\n");
backtrace();
printf("-----------------------------------------------------\n");
rt_hw_cpu_shutdown();
}
static void unhandled_exception_handle(mips_reg_ctx *regs)
{
int i;
unsigned int cause = read_c0_cause();
unsigned int exc = (cause >> 2) & 0x1f;
rt_kprintf("exception happens, epc: 0x%08x\n", regs->CP0EPC);
rt_kprintf(" cause: 0x%08x\n", regs->CP0Cause);
for (i = 0; i < 32; i++)
{
if (i % 4 == 0)
printf("\n");
printf("%8s %08x ", regstr[i], regs->regs[i]);
}
printf("\n");
list_thread();
rt_hw_cpu_shutdown();
}
static void install_default_exception_handler(void)
{
int i;
for (i=0; i<sizeof(sys_exception_handlers)/sizeof(sys_exception_handlers[0]); i++)
sys_exception_handlers[i] = (exception_func_t)unhandled_exception_handle;
sys_exception_handlers[EX_MOD] = mod_handler;
sys_exception_handlers[EX_TLBL] = tlbl_handler;
sys_exception_handlers[EX_TLBS] = tlbs_handler;
sys_exception_handlers[EX_ADEL] = adel_handler;
sys_exception_handlers[EX_ADES] = ades_handler;
sys_exception_handlers[EX_FPE] = fpe_handler;
}
int rt_hw_exception_init(void)
{
/* install the default exception handler */
install_default_exception_handler();
return RT_EOK;
}
/**
* setup the exception handle
*/
exception_func_t rt_set_except_vector(int n, exception_func_t func)
{
exception_func_t old_handler = sys_exception_handlers[n];
if ((n == 0) || (n > 32) || (!func))
{
return 0;
}
sys_exception_handlers[n] = func;
return old_handler;
}
void mips_exception_handler(mips_reg_ctx *ctx)
{
static int read_epc_count = 0;
static int epc_save = 0;
int i;
unsigned int epc;
//��� read_epc_count>0 ˵�� c_except_handler �ڶ� epc ʱ�����ˣ����� epc ������һ���µ��쳣
if (read_epc_count > 0)
{
printf("ERROR: read epc fail when except handle\n");
epc = epc_save;
read_epc_count = 0;
}
else
{
read_epc_count++;
epc_save = 0;
epc = read_c0_epc();
epc_save = epc;
if (epc != 0)
{
printf("-----------------------------------------------------\n");
for (i = 0; i < 4; i++)
{
printf("%08x:\t%08x\n",
(epc - 4 * 4 + i * 4),
*(unsigned int *) ((epc - 4 * 4 + i * 4) | 0xa0000000));
}
for (i = 0; i < 4; i++)
{
printf("%08x:\t%08x\n",
(epc + i * 4),
*(unsigned int *) ((epc + i * 4) | 0xa0000000));
}
printf("-----------------------------------------------------\n");
}
read_epc_count--;
}
printf("-----------------------------------------------------\n");
unsigned int cause = read_c0_cause();
unsigned int exc = (cause >> 2) & 0x1f;
printf("CAUSE=%08x --> %s\n", cause, cause_strings[exc]);
printf("EPC=%08x\n", epc);
for (i = 0; i < 32; i++)
{
if ((i != 0) && (i % 4 == 0))
printf("\n");
printf("%8s %08x ", regstr[i], ctx->regs[i]);
}
printf("\n-----------------------------------------------------\n");
printf("%s: \t %8x\n","CP0Status ", ctx->CP0Status);
printf("%s: \t %8x\n","CP0DataHI ", ctx->CP0DataHI);
printf("%s: \t %8x\n","CP0DataLO ", ctx->CP0DataLO);
printf("%s: \t %8x\n","CP0BadVAddr", ctx->CP0BadVAddr);
printf("%s: \t %8x\n","CP0Cause ", ctx->CP0Cause);
printf("%s: \t %8x\n","CP0EPC ", ctx->CP0EPC);
printf("-----------------------------------------------------\n");
#if 0
switch (exc)
{
case EX_MOD:
/* TLB modified */
break;
case EX_TLBL: /* TLB exc(load or ifetch) */
case EX_TLBS: /* TLB exception (store) */
break;
case EX_ADEL: /* Address err(load or ifetch) */
case EX_ADES: /* Address error (store) */
break;
case EX_IBE: /* Instruction Bus Error */
case EX_DBE: /* Data Bus Error */
break;
case EX_SYS: /* Syscall */
break;
case EX_BP: /* Breakpoint */
case EX_TR: /* Trap instruction */
break;
case EX_RI: /* Reserved instruction */
break;
case EX_FPE: /* floating point exception */
break;
case EX_CPU: /* CoProcessor Unusable */
break;
case EX_OV: /* OVerflow */
case EX_C2E: /* COP2 exception */
case EX_MDMX: /* MDMX exception */
case EX_WATCH: /* Watch exception */
case EX_MCHECK: /* Machine check exception */
case EX_CacheErr: /* Cache error caused re-entry */
/* to Debug Mode */
break;
default:
rt_kprintf("Unknow exception: %d\r\n", exc);
break;
}
#else
sys_exception_handlers[exc](ctx);
#endif
rt_hw_cpu_shutdown();
}
void mips_cache_error_handler (unsigned int Addr)
{
rt_kprintf("cache exception happens, epc: 0x%08x\n", read_c0_epc());
list_thread();
rt_hw_cpu_shutdown();
}
void mips_tlb_refill_handler(void)
{
rt_kprintf("tlb-miss happens, epc: 0x%08x\n", read_c0_epc());
rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
list_thread();
rt_kprintf("current thread: %s\n", rt_thread_self()->name);
rt_hw_cpu_shutdown();
}
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