gtpm1m4fTPF V4R1 Migration Guide: 3.1 to 4.1

Migration Considerations for Application Programs

Before migrating your application programs, you may want to review the following migration considerations.

Macro Considerations

Review the following macro considerations when migrating your application programs:

Reentrancy Considerations

When migrating your application programs, you need to consider that application programs cannot issue an OC instruction to check a constant in a program. Rather, CLI should be used.

Program Nesting Levels

Application programs that reference the program nesting levels to determine how the executing program was entered need to be changed for the following reasons:

Data Sharing Considerations

Consider the following data sharing considerations when migrating your application programs:

31-Bit Addressing Considerations

When migrating your application programs you need to consider that with 31-bit addressing, application programs can no longer use the top order byte of a register or an address to store data.

File Address Reference Formats (FARF) Considerations

Consider the following file address reference format (FARF) considerations when migrating your application programs:

Miscellaneous Considerations

Consider the following miscellaneous considerations when migrating your application programs: