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Dear: I am now study how to porting GNU-as to a new architecture. And I also know the following: The only one thing to modify that porting gas is tc-$machine.c , tc-$machine.h , $machine.h i.e. x86 system, the file are tc-i386.c, tc-i386.h and i386.h There are something trouble me. If I want to porting, how to modify the file list above? i.e. Assume the machine I want to port is xxx, hence the file I need to create is tc-xxx.c tc-xxx.h and xxx.h. However what and how do I put in this file? In additions, what the guts (format) of these machine dependent file?