MPE/iX System Utilities Reference Manual (32650-90882)

60 Chapter2
Utilities Quick Reference
PATCH
PATCH
Syntax
PATCH
or
RUN PATCH.PUB.SYS
Operation
Use PATCH to access, display, and/or modify a program file's object code without
recompiling the program. You can make simple changes to program instructions or to
global stack area variables on
compatibility mode programs.
PATCH requires the memory location of the target program symbols, the beginning
locations of each program unit, and the offsets for each line of code from these locations.
This data may be gathered in a number of ways depending on the source language of the
program.
PATCH supports four subcommands (D, M, DG, and MG) to display the code segment
contents, to modify the code segment contents, to display the global area of the initial
stack, and to modify the global area of the initial stack. PATCH can bypass normal MPE/iX
safeguards and modify the contents of privileged program files.
CAUTION PATCH bypasses normal MPE/iX safeguards and modifies the contents of
privileged program files. It is, therefore, possible to corrupt system file(s) or
the entire operating system. Hewlett-Packard is
not responsible for
modifications that you make to the operating system or system files. For more
information, contact your Hewlett-Packard service representative.
Additional Discussion
For more information, refer to Chapter 18 , “PATCH.”