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详细说明： UPX3.5附带源码. his documentation is written for those brave souls who want to understand and/or modify the UPX assembly stubs - the small snippets that do the runtime decompression when a compressed program is started. If you look at the C++ source files, you can find code fragments like this: addLoader("PEMAIN20", ih.entry ? "PEDOJUMP" : "PERETURN", "IDENTSTR""UPX1HEAD", NULL ); linker->defineSymbol("origina l_entry", ih.entry); and in the assembly files fragments like this: section PEISDLL1 cmpb [esp + 8], 1 jnz reloc_end_jmp section PEMAIN21 reloc_end_jmp: section PERETURN xor eax, eax inc eax ret 0x0C section PEDOJUMP jmp original_entry Everything works as you would expect. If you want to add the code fragment which is in `section PERETURN' to the runtime stub, then simply use `addLoader("PERETURN")' in the C++ source. That's nice, you could say, but how cross section jumps and calls are handled? Well, that is the nicest part of this stuff - they are handled automatically. All you have to do is to add the required sections to the loader using `addLoader()' and the rest is done by upx. It will resolve every conditional or unconditional jumps or subroutine calls for you. You can also use (undefined) symbols in the assembly for values that can only be computed during compression time (like `original_entry'). These symbols can be defined later in C++ using linker->defineSymbol("xx", yy) This functionality (we could say it's a simple linker) is achieved by compiling the assembly into an ELF object file which a little C++ module (src/linker.cpp) can interpret and work with. 温馨提示:该资源已过时. ...展开收缩
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