Is it possible to access variables defined in assembly from C? -

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can read or write variable defined in assembly file in c file? couldn't figure out on own. example c file looks follows:

int num = 33;

and produces assembly code:

.file   "test.c" .globl  _num .data .align 4

_num: .long 33

as started learn assembly heard speed reason why have pick assembly adn lower file size , stuff...

i using mingw(32 bit) gnu assembly on windows7

yes, linker combines .s files , makes single object file. c files first become assembly files. each assembly file have import list, , export list. export list contains variables have .global directive. import list contains variables start extern in c file. if assembly file contains this:

.file   "test.c" .globl  _num .data .align 4

all need in order use num, create extern variable this

extern int num

and you'll able read or modify it.


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