How to use uninitialized data in GCC inline assembly?

If you're mixing C and inline assembly you should let the C compiler handle the memory allocation. Declare your memory as char myvar1024 and reference that from the inline assembly as needed. You can probably access it directly but it would be best to pass it as an arg to asm() and let the compiler choose the addressing format for you.

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I want to use GCC inline assembly, Intel syntax. Is there an equivalent for what I do in NASM: myvar resb 1024 which reserves 1024 bytes memory at location myvar? GCC does not seem to like it: Error: no such instruction: `myvar resb 1024' for int main () { asm("myvar resb 1024"); return 0; } assembly intel inline-assembly link|improve this question edited Apr 17 '11 at 2:44 asked Apr 17 '11 at 2:35nh215928 90% accept rate.

So does that mean GCC will always ignore resbs, even if I write the assembly myself in an . S file into the proper region? – nh2 Apr 17 '11 at 22:11 1 When you use GCC you're assembling with GAS which has different syntax than NASM (which you must be used to if you want resb).

If you put the right command (eg . Lcomm) in the right section GAS will reserve space for you. Check out: ibm.com/developerworks/linux/library/l-g... .

However, I think you would be better off doing the allocation in C for mixed code. – Ben Jackson Apr 17 '11 at 23:22.

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