swift2 - calling a function defined in assembly from swift

Question

I know in swift it is possible to interop with c using the @_silgen_name attr on a function in a swift module. Is there a way to do this with a symbol defined in an assembly file? I would like to make syscalls using Swift. This is why I'm asking.

Answer 1

Create the bridge header.h file and put the prototype of the function in that file.

For example your assembly code:

.globl _add // make it global so that others can find this symbol
....
_add: // int add(int a, int b)
  movl %esi, %eax
  addl %edi, %eax
  ret

Then in bridging header.h file

int add(int a, int b);

OR

define this at the top of the swift module

@_silgen_name("add") func add(a: Int32, b: Int32) -> Int32

Then in swift you can use it:

let a = add(1, 2);