1. Application Binary Interface (ABI)
taken from

2. Application Binary Interface (ABI)
a specification defining requirements for portability of applications at binary level (i.e., executables)
no recompilation or relinking
interoperability (assembly language subroutine can be called from HLL)
usually associated with a particular OS or OS family

3. Application Binary Interface (ABI)
thus, an executable compiled according to one ABI will not typically run under a different OS on the same machine
also: allows assembly language routines to be called from HLL routines, and HLL routines to be called from assembly language routines

4. Application Binary Interface (ABI)
specifications in ABI include:
specific processor or processor family
any required processor features (e.g., SIMD instructions)
data formats
register usage conventions
stack frame format
parameter passing, including fp/structure/union parameters
return value passing, including fp/structure/union return values
specific OS or OS family
object and executable file formats

5. Application Binary Interface (ABI)
example register conventions
actual parameters
return value(s)
return address
stack pointer
frame pointer
global area pointer
constant pool pointer
temporaries
caller-saved (if caller wants them preserved over call, caller must save and restore)
callee-saved (if called subroutines wants to use them, subroutine must save and retore)

6. Application Binary Interface (ABI)
ARM ABI -