Why is the function address in the vector table offset by 1 byte from the actual function address?

[Louis__0]

Such as the title，why is the function address in the vector table offset by 1 byte from the actual function address?

In the vector table:

Actually:

and

This makes me wonder.

[TDK · Accepted solution]

Just an artifact of thumb instruction mode. The LSB is treated as a flag, rather than as a part of the address.

Function address in ARM assembly have one byte offset? - Stack Overflow

[Louis__0]

Your answer has given me great inspiration！Thanks!