what will happen if 8051 encounts a wrong instruction?

as the title.
what will happen if 8051 encounts a wrong instruction?

as the title.
What will be happened if I insert a store instruction behind a LDREX instruction for accessing the same address?

There is a system with two CPU,for example,cpuA and cpuB. Firstly, cpuA issue a LDREX for accessing the address A,and cpuB issued a STORE for writing the address A. If CPUA send a STREX for writing the...
What will be happened if I insert a store instruction behind a LDREX instruction for accessing the same address?

There is a system with two CPU,for example,cpuA and cpuB. Firstly, cpuA issue a LDREX for accessing the address A,and cpuB issued a STORE for writing the address A. If CPUA send a STREX for writing the...
If the mispredict happen, is there a mechanism to abort the instructions(have been fetched or decoded)?

If the mispredict happen, is there a mechanism to abort the instructions(have been fetched or decoded)? If there is the mechanism, how does it work? Thanks very much!