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We've been through some pretty substantial programs at the end of our DOS sojourn, so rather than start again with the most primitive "eat at Joe's" one-liner, I'll present a sort of boilerplate assembly program that provides some useful mechanisms that nearly all programs will find handy The beginning and end are set up for you; when you want to create a new assembly language program for Linux, you just load the boilerplate program and fill in the middle with your own code So let's get started Here it is Read it over carefully: ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Source name Executable name Version Created date Last update Author Description : : : : : : : BOILERASM BOILER -- though this isn't intended to be run! 10 10/1/1999 10/18/1999 Jeff Duntemann A "skeleton" program in assembly for Linux, using NASM 098
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Build using these commands: nasm -f elf boilerasm gcc boilero -o boiler HOWEVER, the program as given here is "boilerplate" and has nothing "useful" to do The idea is to give you a head start on new projects, by providing the things that every (or nearly every) simple Linux assembly program must have
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[SECTION text] global main main:
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; Section containing code ; Required so linker can find entry point
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push ebp ; Set up stack frame mov ebp,esp ; ebp is our "thumb" in the stack push ebx ; Program must preserve ebp, ebx, esi, & edi push esi push edi ;;; Everything before this is boilerplate; use it for all ordinary apps! ;;; This is where you put your own code! ;;; pop pop pop mov pop ret Everything after this is boilerplate; use it for all ordinary apps! edi ; Restore saved registers esi ebx esp,ebp ; Destroy stack frame before returning ebp ; Return control to Linux ; Section containing initialized data ; Section containing uninitialized data
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[SECTION data] [SECTION bss]
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One of the odder provisions of the C calling conventions that I described earlier is that a program may not arbitrarily change all general-purpose registers To me this is dumb; if the operating system doesn't want an application to change certain registers, it should save those register values before handing control to the application However, we must deal with what is, as they say, and the best way to do that is to just save the registers that must be saved before we begin, and restore them again before we pack it up and go home
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The registers that cannot be changed by a Linux application are EBX, ESP, EBP, ESI, and EDI You'll notice that BOILERASM saves these registers onto the stack when the program begins, and then restores them from the stack before control returns to Linux One very important but extremely nonobvious conclusion you must draw from this requirement to save EBX, ESP, EBP, ESI, and EDI is that the other general-purpose registers may be trashed Yes, trashed-and not only by you When you call procedures written by other people-primarily in the standard C libraries and in utility libraries such as ncurses-those procedures may alter the values in EAX, ECX, and EDX (The stack pointer ESP is a special case and needs special care of a sort not applicable to other registers) What this means for you is that you cannot assume that (for example) a counter value you're tracking in ECX will be left untouched when you call a C library function such as printf If you're using ECX to count passes through a loop that calls a library function-or any function that you yourself didn't write-you must save your value of ECX on the stack before you call the library function and restore it after the library function returns The same applies to EAX and EDX (EAX is often used to return values from library functions, so it's not a good idea to use it to store counters and addresses and such when you're making library function calls) If you need to keep their values intact across a call to a library function, you must save them to the stack before the library function is called On the other hand, the sacred nature of EBX, EBP, ESI, and EDI means that these registers will keep their values when you make C library calls What is binding on you is binding on the C library as well Library functions that must use these registers save and restore them without any attention from you
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