New, updated definition of the callback:
void bx_instr_opcode(unsigned cpu, const Bit8u *opcode, unsigned len, bx_bool is32, bx_bool is64);
The callback is called each time, when Bochs completes to decode a new
instruction. Through this callback function Bochs could provide an opcode of
the instruction, opcode length and an execution mode (16/32/64).
Please note, that Bochs uses translation caches so each simulated instruction
might be executed multiple times but decoded only once.
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