异常故障错误

我的前辈已经设置了一个函数来捕获由处理器FRI（DaveBy-0II）错位内存REFII导致的越界引用。不知为什么，当我运行它时，下面的代码会变成异常错误。如果将它设置为null，则需要确认。R“log & gt；计数”传递给整数？



      以下为原文

    My predecessors had set up a function to trap exceptions thrown by processor for
i) div-by-0
ii) misaligned memory ref
iii) out of bounds ref.

#define RCON_EXC                    (0x40 | 0x04 | 0x08 |0x10)
....
void _general_exception_handler (unsigned cause, unsigned status)
{
   RCON = RCON_EXC;
   KRNL_Reset();
}

Somehow my code below goes into exception fault when I run it.
Just need confirmation if setting it to NULL is the root cause
OR
is it due to the deferenced pointer "log->count" passed to the Integer?

//Usage.h HEADER FILE CONTENTS
#define MAX_SIZE 10
typedef UINT8 ComponentName_t[MAX_SIZE];

typedef struct
{
ComponentName_t Identity;
UINT16 count;
UINT16 SeqNum;
} UsageLog_t;
...

//Usage.c FILE CONTENTS
static UsageLog_t *log = NULL;

static cycleCount = 0;



void IncrementCounter(void) {
     log->count++;
}

void PerformPostChecks(void){
    UINT16 PD = 0;
    ...
    PD = log->count; //This line causes exception to be thrown, when removed there is absolutely no        problem.
}

void main (void){
  while (1) {
          cycleCount++;
          if (cycleCount >= 10){
                    IncrementCounter();
                    cycleCount  = 0;
                 }
          PerformPostChecks();
          }
}