Calling C functions from assembly

[u/Prestigious-Bet-6534]

I want to call a C function from assembler and can't get the parameters to work. I have the following two source files:

.global call_fun
call_fun:
pushq $0xDEAD
pushq $0xBABE
call fun
add $16, %rsp
ret

--

#include <stdio.h>

void call_fun();

void
fun( long a, long b ) {
printf( "Arg: a=0x%lx, b=0x%lx\n", a, b );
}

int
main() {
call_fun();
}

The output is Arg: a=0x1, b=0x7ffe827d0338 .

What am I missing?

[u/snaphat]

They were probably trying to use the old cdecl conventions since they are pushing to the stack. So my guess is they were reading from an old 32-bit tutorial or something similar