Translation block invalidation prehints in emulation of a target system on a host system

A host system for emulation of a target system, comprising:

• one or more host system processors;
• a memory coupled to the one or more host system processors;
• a set of processor executable instructions embodied in the memory, the processor executable instructions including instructions for implementing a method for invalidating blocks of translated code, the method comprising:
• translating one or more blocks of target system code with the host system to produce one or more corresponding blocks of translated code, wherein translating one or more blocks of target system code includes linking two or more blocks of translated code together to form a chain such that a look-up in a first translated block in the chain will directly branch to a second translated block;
• analyzing the one or more blocks of target system code for the presence of one or more native target system instructions indicative of modification of the target system code during execution;
• if the one or more native target system instructions are present, marking some or all of the one or more blocks of translated code as potentially invalid;
• and
• re-translating one or more blocks of target system code corresponding to one or more blocks of translated code that have been marked as potentially invalid;
• and
• if one or more of the blocks of translated code is invalidated, overriding one or more instructions in the one or more blocks of translated code without undoing the chain.

A non-transitory computer readable medium having embodied therein computer readable instructions for implementing a method for emulation of a target system on a host system, the method comprising:

• translating one or more blocks of target system code with the host system to produce one or more corresponding blocks of translated code;
• analyzing the one or more blocks of target system code for the presence of one or more native target system instructions indicative of modification of the target system code during execution;
• and
• if the one or more native target system instructions are present, marking some or all of the one or more blocks of translated code as potentially invalid;
• and
• re-translating one or more blocks of target system code corresponding to one or more blocks of translated code that have been marked as potentially invalid.