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"
0x10, "double trap"
0x12, "software check fault"
0x13, "hardware error fault"
0x14, "fetch guest page fault"
0x15, "load guest page fault"
0x16, "virtual instruction"
0x17, "store guest page fault"