Reconfiguration of address space based on loading short pointer mode application

Patent metadata

Field	Value
Publication number	US-9836291-B1
Application number	US-201615216896-A
Country	US
Kind code	B1
Filing date	Jul 22, 2016
Priority date	Jul 22, 2016
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A short pointer mode application has been loaded. Based on determining that the short pointer mode application has been loaded, an address space configured for a long pointer mode environment is reconfigured. The address space has one portion addressable by short pointers of a defined size and another portion addressable by long pointers of another defined size, and the reconfiguring includes obtaining a long pointer library, and loading the long pointer library in the one portion of the address space addressable by short pointers.

First claim

What is claimed is:

1. A computer program product for facilitating processing in a computing environment, said computer program product comprising:
a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
determining that a short pointer mode application has been loaded;
reconfiguring, based on determining the short pointer mode application has been loaded, an address space configured for a long pointer mode environment, the address space having one portion addressable by short pointers of a defined size and another portion addressable by long pointers of another defined size, the reconfiguring comprising:
obtaining a long pointer library; and
loading the long pointer library in the one portion of the address space addressable by short pointers;

obtaining a select library to load;
loading the select library in the one portion of the address space or the other portion of the address space, based on the select library not being a short pointer library; and
modifying by the select library one or more characteristics of the select library for the select library to be operable in a short mode environment.

2. The computer program product of claim 1 , wherein the short pointer mode application is loaded in the one portion of the address space addressable by short pointers.

3. The computer program product of claim 1 , wherein the reconfiguring further comprises configuring a stack in the one portion of the address space addressable by short pointers.

4. The computer program product of claim 1 , wherein the reconfiguring further comprises configuring a heap in the one portion of the address space addressable by short pointers.

5. The computer program product of claim 1 , wherein the method further comprises:
determining whether the select library is a short pointer library; and
loading the select library in the one portion of the address space addressable by short pointers, based on the select library being a short pointer library.

6. The computer program product of claim 5 , wherein the method further comprises loading the select library in the other portion of the address space, based on the select library not being a short pointer library.

7. The computer program product of claim 1 , wherein the defined size is one of 31 bits or 32 bits, and the other defined size is 64 bits.

8. The computer program product of claim 1 , wherein the determining includes checking a field associated with the application.

9. The computer program product of claim 1 , wherein a pointer of the long pointer library is a procedure linkage table pointer, and the procedure linkage table pointer is a long pointer.

10. A computer system for facilitating processing in a computing environment, said computer system comprising:
a memory; and
a processor in communication with the memory, wherein the computer system is configured to perform a method, said method comprising:
determining that a short pointer mode application has been loaded; and
reconfiguring, based on determining the short pointer mode application has been loaded, an address space configured for a long pointer mode environment, the address space having one portion addressable by short pointers of a defined size and another portion addressable by long pointers of another defined size, the reconfiguring comprising:
obtaining a long pointer library; and
loading the long pointer library in the one portion of the address space addressable by short pointers;

obtaining a select library to load;
loading the select library in the one portion of the address space or the other portion of the address space, based on the select library not being a short pointer library; and
modifying by the select library one or more characteristics of the select library for the select library to be operable in a short mode environment.

11. The computer system of claim 10 , wherein the short pointer mode application is loaded in the one portion of the address space addressable by short pointers.

12. The computer system of claim 10 , wherein the reconfiguring further comprises configuring a stack in the one portion of the address space addressable by short pointers.

13. The computer system of claim 10 , wherein the reconfiguring further comprises configuring a heap in the one portion of the address space addressable by short pointers.

14. A computer-implemented method of facilitating processing in a computing environment, said computer-implemented method comprising:
determining, by a processor, that a short pointer mode application has been loaded; and
reconfiguring, based on determining the short pointer mode application has been loaded, an address space configured for a long pointer mode environment, the address space having one portion addressable by short pointers of a defined size and another portion addressable by long pointers of another defined size, the reconfiguring comprising:
obtaining a long pointer library; and
loading the long pointer library in the one portion of the address space addressable by short pointers;

obtaining a select library to load;
loading the select library in the one portion of the address space or the other portion of the address space, based on the select library not being a short pointer library; and
modifying by the select library one or more characteristics of the select library for the select library to be operable in a short mode environment.

15. The computer-implemented method of claim 14 , wherein the short pointer mode application is loaded in the one portion of the address space addressable by short pointers.

16. The computer-implemented method of claim 14 , wherein the reconfiguring further comprises configuring a stack in the one portion of the address space addressable by short pointers.

17. The computer-implemented method of claim 14 , wherein the reconfiguring further comprises configuring a heap in the one portion of the address space addressable by short pointers.

Assignees

• IBM

Inventors

• Gschwind Michael K

Classifications

• G06F9/44521

  Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading · CPC title

• G06F8/447 Primary

  Target code generation · CPC title

• G06F8/441 Primary

  Register allocation; Assignment of physical memory space to logical memory space · CPC title

• G06F9/44505

  Configuring for program initiating, e.g. using registry, configuration files · CPC title