0x00, "misaligned fetch"
0x01, "fetch access"
0x02, "illegal instruction"
0x03, "breakpoint"
0x04, "misaligned load"
0x05, "load access"
0x06, "misaligned store"
0x07, "store access"
0x08, "user_ecall"
0x09, "supervisor_ecall"
0x0A, "virtual_supervisor_ecall"
0x0B, "machine_ecall"
0x0C, "fetch page fault"
0x0D, "load page fault"
0x0F, "store page fault"
0x14, "fetch guest page fault"
0x15, "load guest page fault"
0x16, "virtual instruction"
0x17, "store guest page fault"