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Communication with Assembler Programs

Introduction

The compiler and library contain a number of features to facilitate the use of the C language and assembler language in the same program. The features discussed in this chapter include the following:

the assembler macros CENTRY and CEXIT, which enable assembler modules to allocate space on the automatic storage stack
the extensions to the C language to support call-by-reference and IBM format varying-length parameter lists so that existing assembler routines can be called easily
the library mechanism by which a routine in another language can call a C main function, passing one or more arguments of any type.

This chapter is oriented towards applications that call assembler from C. Communicating between C and other high-level languages is discussed in detail in the SAS/C Compiler Interlanguage Communication Feature User's Guide.

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