kunlun/dtest/exception_test/exception_test.c

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be copied by any method or incorporated into another program without
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/* os shim includes */
#include "os_types.h"
#include "os_task.h"
#include "os_utils.h"

/* common includes */
#include "iot_io.h"
#include "iot_bitops.h"
#include "iot_pkt_api.h"
#include "iot_ipc.h"
#include "iot_plc_lib.h"
#include "iot_dbglog_api.h"
#include "iot_config.h"

/* driver includes */
#include "iot_clock.h"
#include "iot_uart.h"

/* cli includes */
#include "iot_cli.h"

/* debug includes*/
#include "dbg_io.h"

typedef void (*jump)(void);

void div_zero()
{
    int a = 0;
    int b = 1;
    int c;
    c = b/a;
    iot_printf("div zero : c=%d\r\n", c);
}

void invalid_addr_access()  // mcause: 5/7 load/store address fault
{
    int *buf = (int *)0x90000000;
    //*buf = 0xaabbccdd;
    iot_printf("align test a: %08x\r\n", *(buf));
}

void misalign_access()    // mcause: 4/6 load/store address misaligned
{
    uint32_t *a = (uint32_t *) 0x1003ffd1;
    //*a = 0xaabb;
    //*(a+1) = 0xccdd;
    iot_printf("align test a: %08x\r\n", *(a));
    iot_printf("align test a: %08x\r\n", *(a+1));
}

void instruction_illegal()   // mcause: 2  illegal instruction
{
    void (*pgm_start)(void) = (void*) 0x001003d1;
    pgm_start();
}

void invalid_instruction_access()  // mcause: 1 instruction fault
{
    void (*pgm_start)(void) = (void*) 0x80000040;
    pgm_start();
}

void instruction_misalign()
{
    int a = 10;
    iot_printf("a=%d\n", a);
}


void back_d()
{
    iot_printf("back 4.......\r\n");
    misalign_access();
}

struct test_t {
    void (*callback)(void);
};

struct test_t g_test = {0};

void back_c()
{
    iot_printf("back 3.......\r\n");
    g_test.callback = back_d;
    g_test.callback();
}

void back_b()
{
    iot_printf("back 2.......\r\n");
    back_c();
}

void back_a()
{
    iot_printf("back 1.......\r\n");
    back_b();
}

void trap_back_test()
{
    back_a();
}

int main(void)
{
  dbg_uart_init();
   int i = 100;
   int a = 100;
   int b = 10;
   int c = 100;
   int d = 100;
   iot_printf("%d %d %d %d %d\r\n", a,b,c,d,i);

   //trap_back_test();

  int j = 0;
   while(i)
   {
        //div_zero();
        //invalid_instruction_access();  // mcause: 1
        //instruction_illegal();          // mcause: 2
        //misalign_access();            // mcause: 6
        //invalid_addr_access();        // mcause: 7
        //instruction_misalign();
        
        iot_printf("count i: %d\r\n", i);

        for(j = 0; j<10000;j++);
        i--;
   }
   return 0;
}