Messages in this thread | | | Date | Thu, 18 Nov 2004 11:28:41 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: Accessing program counter registers from within C or Aseembler. |
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>> Does anybody know how to access the address of the >> current executing instruction in C while the program >> is executing? > >In other words, are you trying to answer "Where in memory am *I*?" >or "Where in memory is <that very recent code I want to look at>?" > >(Hint - for the former, you can probably get very good approximations >by just looking at the entry point address for the function: > > (void *) where = &__FUNCTION__;
Well, that's only the function in which you are (i.e. it's an approximation to EIP)
>> Also, is there a method to load a program image from >> memory not a file (an exec that works with a memory >> address)? Mainly I am looking for a method that brings >> a program image into memory modify parts of it and >> start the in-memory modified version. > >In user space, you probably want either mmap() or dlopen(), depending what it >is you're trying to do, most likely...
Those pages will probably have NX set then, for archs which support it.
Jan Engelhardt -- Gesellschaft für Wissenschaftliche Datenverarbeitung Am Fassberg, 37077 Göttingen, www.gwdg.de - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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