383 lines
11 KiB
C
383 lines
11 KiB
C
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/*
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* File : mips_excpt.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2016<EFBFBD><EFBFBD>9<EFBFBD><EFBFBD>7<EFBFBD><EFBFBD> Urey the first version
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*/
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#include <rtthread.h>
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#include <rthw.h>
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#include <stdio.h>
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#include "mips.h"
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#include "mips_excpt.h"
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extern int backtrace(void);
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int backtrace_ctx(mips_reg_ctx *ctx);
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extern long list_thread(void);
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const static char *regstr[] = {
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"$0 zero", "$1 at", "$2 v0", "$3 v1", "$4 a0", "$5 a1", "$6 a2", "$7 a3",
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"$8 t0", "$9 t1", "$10 t2", "$11 t3", "$12 t4", "$13 t5", "$14 t6", "$15 t7",
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"$16 s0", "$17 s1", "$18 s2", "$19 s3", "$20 s4", "$21 s5", "$22 s6", "$23 s7",
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"$24 t8", "$25 t9", "$26 k0", "$27 k1", "$28 gp", "$29 sp", "$30 fp", "$31 ra"
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};
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static const char *cause_strings[32] =
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{
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/* 0 */ "Int",
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/* 1 */ "TLB Mods",
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/* 2 */ "TLB Load",
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/* 3 */ "TLB Store",
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/* 4 */ "Address Load",
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/* 5 */ "Address Store",
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/* 6 */ "Instruction Bus Error",
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/* 7 */ "Data Bus Error",
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/* 8 */ "Syscall",
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/* 9 */ "Breakpoint",
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/* 10 */ "Reserved Instruction",
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/* 11 */ "Coprocessor Unuseable",
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/* 12 */ "Overflow",
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/* 13 */ "Trap",
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/* 14 */ "Instruction Virtual Coherency Error",
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/* 15 */ "FP Exception",
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/* 16 */ "Reserved 16",
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/* 17 */ "Reserved 17",
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/* 18 */ "Reserved 18",
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/* 19 */ "Reserved 19",
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/* 20 */ "Reserved 20",
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/* 21 */ "Reserved 21",
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/* 22 */ "Reserved 22",
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/* 23 */ "Watch",
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/* 24 */ "Reserved 24",
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/* 25 */ "Reserved 25",
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/* 26 */ "Reserved 26",
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/* 27 */ "Reserved 27",
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/* 28 */ "Reserved 28",
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/* 29 */ "Reserved 29",
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/* 30 */ "Reserved 30",
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/* 31 */ "Data Virtual Coherency Error"
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};
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/**
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* exception handle table
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*/
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exception_func_t sys_exception_handlers[32];
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static void mod_handler(mips_reg_ctx *regs)
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{
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rt_kprintf("tlb modification exception\n");
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rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
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rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
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list_thread();
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printf("-----------------------------------------------------\n");
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printf("BACKTRACE:\n");
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backtrace();
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printf("-----------------------------------------------------\n");
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rt_hw_cpu_shutdown();
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}
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static void tlbl_handler(mips_reg_ctx *regs)
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{
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rt_kprintf("tlb exception: load\n");
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rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
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rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
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list_thread();
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printf("-----------------------------------------------------\n");
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printf("BACKTRACE:\n");
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backtrace();
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printf("-----------------------------------------------------\n");
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rt_hw_cpu_shutdown();
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}
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static void tlbs_handler(mips_reg_ctx *regs)
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{
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rt_kprintf("tlb exception: store\n");
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rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
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rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
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list_thread();
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printf("-----------------------------------------------------\n");
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printf("BACKTRACE:\n");
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backtrace();
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printf("-----------------------------------------------------\n");
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rt_hw_cpu_shutdown();
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}
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static void adel_handler(mips_reg_ctx *regs)
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{
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rt_kprintf("address error exception: load\n");
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rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
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rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
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list_thread();
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rt_kprintf("current thread: %.*s\n", RT_NAME_MAX, rt_thread_self()->name);
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printf("-----------------------------------------------------\n");
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printf("BACKTRACE:\n");
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backtrace();
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printf("-----------------------------------------------------\n");
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rt_hw_cpu_shutdown();
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}
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static void ades_handler(mips_reg_ctx *regs)
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{
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rt_kprintf("address error exception: store\n");
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rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
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rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
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list_thread();
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printf("-----------------------------------------------------\n");
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printf("BACKTRACE:\n");
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backtrace();
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printf("-----------------------------------------------------\n");
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rt_hw_cpu_shutdown();
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}
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static void fpe_handler(mips_reg_ctx *regs)
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{
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rt_kprintf("floating point exception\n");
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rt_kprintf("exception happens, epc: 0x%08x\n", read_c0_epc());
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rt_kprintf(" cause: 0x%08x\n", read_c0_cause());
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list_thread();
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printf("-----------------------------------------------------\n");
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printf("BACKTRACE:\n");
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backtrace();
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printf("-----------------------------------------------------\n");
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rt_hw_cpu_shutdown();
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}
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static void unhandled_exception_handle(mips_reg_ctx *regs)
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{
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int i;
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unsigned int cause = read_c0_cause();
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unsigned int exc = (cause >> 2) & 0x1f;
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rt_kprintf("exception happens, epc: 0x%08x\n", regs->CP0EPC);
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rt_kprintf(" cause: 0x%08x\n", regs->CP0Cause);
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for (i = 0; i < 32; i++)
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{
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if (i % 4 == 0)
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printf("\n");
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printf("%8s %08x ", regstr[i], regs->regs[i]);
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}
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printf("\n");
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list_thread();
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rt_hw_cpu_shutdown();
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}
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static void install_default_exception_handler(void)
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{
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int i;
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for (i=0; i<sizeof(sys_exception_handlers)/sizeof(sys_exception_handlers[0]); i++)
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sys_exception_handlers[i] = (exception_func_t)unhandled_exception_handle;
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sys_exception_handlers[EX_MOD] = mod_handler;
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sys_exception_handlers[EX_TLBL] = tlbl_handler;
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sys_exception_handlers[EX_TLBS] = tlbs_handler;
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sys_exception_handlers[EX_ADEL] = adel_handler;
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sys_exception_handlers[EX_ADES] = ades_handler;
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sys_exception_handlers[EX_FPE] = fpe_handler;
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}
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int rt_hw_exception_init(void)
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{
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/* install the default exception handler */
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install_default_exception_handler();
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return RT_EOK;
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}
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/**
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* setup the exception handle
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*/
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exception_func_t rt_set_except_vector(int n, exception_func_t func)
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{
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exception_func_t old_handler = sys_exception_handlers[n];
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if ((n == 0) || (n > 32) || (!func))
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{
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return 0;
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}
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sys_exception_handlers[n] = func;
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return old_handler;
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}
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void mips_exception_handler(mips_reg_ctx *ctx)
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{
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static int read_epc_count = 0;
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static int epc_save = 0;
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int i;
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unsigned int epc;
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//<2F><><EFBFBD><EFBFBD> read_epc_count>0 ˵<><CBB5> c_except_handler <20>ڶ<EFBFBD> epc ʱ<><CAB1><EFBFBD><EFBFBD><EFBFBD>ˣ<EFBFBD><CBA3><EFBFBD><EFBFBD><EFBFBD> epc <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>µ<EFBFBD><C2B5>쳣
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if (read_epc_count > 0)
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{
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printf("ERROR: read epc fail when except handle\n");
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epc = epc_save;
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read_epc_count = 0;
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}
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else
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{
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read_epc_count++;
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epc_save = 0;
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epc = read_c0_epc();
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epc_save = epc;
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if (epc != 0)
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{
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printf("-----------------------------------------------------\n");
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for (i = 0; i < 4; i++)
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{
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printf("%08x:\t%08x\n",
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(epc - 4 * 4 + i * 4),
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*(unsigned int *) ((epc - 4 * 4 + i * 4) | 0xa0000000));
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}
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for (i = 0; i < 4; i++)
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{
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printf("%08x:\t%08x\n",
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(epc + i * 4),
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*(unsigned int *) ((epc + i * 4) | 0xa0000000));
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}
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printf("-----------------------------------------------------\n");
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}
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read_epc_count--;
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}
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printf("-----------------------------------------------------\n");
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unsigned int cause = read_c0_cause();
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unsigned int exc = (cause >> 2) & 0x1f;
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printf("CAUSE=%08x --> %s\n", cause, cause_strings[exc]);
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printf("EPC=%08x\n", epc);
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for (i = 0; i < 32; i++)
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{
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if ((i != 0) && (i % 4 == 0))
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printf("\n");
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printf("%8s %08x ", regstr[i], ctx->regs[i]);
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}
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printf("\n-----------------------------------------------------\n");
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printf("%s: \t %8x\n","CP0Status ", ctx->CP0Status);
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printf("%s: \t %8x\n","CP0DataHI ", ctx->CP0DataHI);
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printf("%s: \t %8x\n","CP0DataLO ", ctx->CP0DataLO);
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printf("%s: \t %8x\n","CP0BadVAddr", ctx->CP0BadVAddr);
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printf("%s: \t %8x\n","CP0Cause ", ctx->CP0Cause);
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printf("%s: \t %8x\n","CP0EPC ", ctx->CP0EPC);
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printf("-----------------------------------------------------\n");
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#if 0
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switch (exc)
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{
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case EX_MOD:
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/* TLB modified */
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break;
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case EX_TLBL: /* TLB exc(load or ifetch) */
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case EX_TLBS: /* TLB exception (store) */
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break;
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case EX_ADEL: /* Address err(load or ifetch) */
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case EX_ADES: /* Address error (store) */
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break;
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case EX_IBE: /* Instruction Bus Error */
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case EX_DBE: /* Data Bus Error */
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break;
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case EX_SYS: /* Syscall */
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break;
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case EX_BP: /* Breakpoint */
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case EX_TR: /* Trap instruction */
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break;
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case EX_RI: /* Reserved instruction */
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break;
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case EX_FPE: /* floating point exception */
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break;
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case EX_CPU: /* CoProcessor Unusable */
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break;
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case EX_OV: /* OVerflow */
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case EX_C2E: /* COP2 exception */
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case EX_MDMX: /* MDMX exception */
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case EX_WATCH: /* Watch exception */
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case EX_MCHECK: /* Machine check exception */
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case EX_CacheErr: /* Cache error caused re-entry */
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/* to Debug Mode */
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break;
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default:
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rt_kprintf("Unknow exception: %d\r\n", exc);
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break;
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}
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#else
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|
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();
|
|||
|
|
}
|