gtpm1m4f | TPF V4R1 Migration Guide: 3.1 to 4.1 |
Before migrating your application programs, you may want to review the following migration considerations.
Review the following macro considerations when migrating your application programs:
The content of register 14 (R14) and register 15 (R15) are unknown after an SVC call. The content of R14 and R15 are unknown after many macro calls.
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.
Application programs that reference the program nesting levels to determine how the executing program was entered need to be changed for the following reasons:
Consider the following data sharing considerations when migrating your application programs:
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.
Consider the following file address reference format (FARF) considerations when migrating your application programs:
See Expanded File Addressing Capacity and File Address Reference Format for more information about the FARF changes for the TPF 4.1 system and how to migrate your file addresses.
Consider the following miscellaneous considerations when migrating your application programs: