Next: , Previous: Conditional Compilation, Up: Top  Appendix F
Inline Assembler  If you need to write low-level software that
interacts directly with the hardware, Ada provides two ways to
incorporate assembly language code into your program. First, you
can import and invoke external routines written in assembly
language, an Ada feature fully supported by GNAT. However, for
small sections of code it may be simpler or more efficient to
include assembly language statements directly in your Ada source
program, using the facilities of the implementation-defined
package System.Machine_Code, which incorporates the gcc Inline
Assembler. The Inline Assembler approach offers a number of
advantages, including the following:  This chapter presents a
series of examples to show you how to use the Inline Assembler.
Although it focuses on the Intel x86, the general approach
applies also to other processors. It is assumed that you are
familiar with Ada and with assembly language programming.