程序莫名其妙跑飞

停止运行后发现程序跑到以下代码处运行，不知道什么意思

#pragma NO_FRAME
#pragma NO_ENTRY
#pragma NO_EXIT

void NEAR _CASE_CHECKED_BYTE (void) {
__asm {
PULX ; load address
PSHB
CMPB 2, X+ ; compare low byte
TBNE A, defa ; branch if value > 0xff
BLO jump ; branch if value < #entries
defa: LDAB -1, X ; select default entry, address = X-1
BRA sum
jump: LDAB B, X ; load branch offset
sum: LEAX B, X
PULB
_SRET ; debug info only: This is the last instr of a function with a special return
JMP 0, X ; jump to selected entry
}
}