Combining C or C++ and Assembler programs
This topic describes how to communicate between z/OS® XL C/C++ and assembler programs. To write assembler code that can be called from z/OS XL C/C++, use the prolog and epilog macros described in this topic. For more information about how the z/OS Language Environment® works with assembler, see z/OS Language Environment Programming Guide, and z/OS Language Environment Writing Interlanguage Communication Applications.
z/OS Language Environment provides a set of assembler macros for use with 64–bit assembler programs. For information about writing 64–bit assembler programs see z/OS Language Environment Programming Guide for 64-bit Virtual Addressing Mode.
Access to z/OS UNIX is intended to be through
the z/OS UNIX XL C/C++ runtime library only.
The z/OS XL C/C++ compiler does not support the
direct use of z/OS UNIX callable services such as
the assembler interfaces. You should not directly use z/OS UNIX callable
services from your z/OS XL C/C++ application programs,
because problems can occur with the processing of the following:
- Signals
- Library transfers
fork()exec()- Threads