hi!
how do i use C variables within a __asm__() statement?
assume i have the following function:
and i want to use hardcoded variables instead of $0x1 for example.Code:void doit(void) { __asm__("movl $0x1, %eax\n" "movl $0x1, %ebx\n" "int $0x80\n"); }
how would i do that?
i tried
but that didnt seem to work.Code:__asm__(".include \"defines.asm\"\n");
can i hardcode the values of the variables in a C header file and use them afterwards from __asm__()?
thanks
That would depend entirely on which C compiler you have.
Everything about asm() is implementation-specific.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
im using gcc 3.3.1 on a linux x86 machine...
Try here
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
No matter which implementation you use, you have to understand that an assembler may only deal with variables via registers or register references to RAM.
Registers are limited in number. The more 'C' variables you use in an inline assembler function, the more the compiler has to juggle real registers to handle your needs.
It is not the spoon that bends, it is you who bends around the spoon.
thanks for the replies. i think i got it working now.
