NonStop S-Series Server Description Manual (G06.27+)

Contents

HP NonStop S-Series Server Description Manual—520331-004

Figures (continued)

Figure 6-6. An Example of Register Stack Operations 6-11

Figure 6-7. The TNS Register Stack Is Implemented in the RP Wrap Page 6-13

Figure 6-8. In Concept, the P Register Controls Execution Flow 6-15

Figure 6-9. The BUN Instruction Is Typical of Branch Instructions 6-16

Figure 6-10. Two Examples of Branching 6-17

Figure 6-11. An Example of Code Segment Indexing 6-19

Figure 6-12. An Example of Indirect Addressing in the Data Segment 6-21

Figure 6-13. Byte Addressing in the Data Segment Is Restricted to Half

Segment 6-22

Figure 6-14. Indirect Byte Addressing in the Data Segment Can Specify Odd

Bytes 6-23

Figure 6-15. Sequence and Encoding for Indexing in the Data Segment 6-25

Figure 6-16. Three Examples of Indexing in the Data Segment 6-27

Figure 6-17. Direct and Indirect Examples of SG Addressing 6-29

Figure 6-18. Layout of Procedure Code in a TNS Code Segment 6-31

Figure 6-19. Procedure Entry Points Are Grouped by Attribute in the PEP

Table 6-33

Figure 6-20. Procedure Data Consists of Global Areas and Stack Frame 6-35

Figure 6-21. There Are Four Data Segment Addressing Modes 6-37

Figure 6-22. PUSH and POP Instructions Add and Delete Stack Elements 6-39

Figure 6-23. Example of a Procedure Call and Exit 6-41

Figure 6-24. Sequence of Events Performed by a PCAL Instruction 6-43

Figure 6-25. Sequence of Events Performed by an EXIT Instruction 6-45

Figure 6-26. Defining and Accessing a Procedure’s Local Variables 6-47

Figure 6-27. Example of Passing Parameters to a Called Procedure 6-49

Figure 6-28. Examples of Accessing Value Parameters and Reference

Parameters 6-51

Figure 6-29.

Sequence of Events for Saving a Stack Frame 6-53

Figure 6-30. Sequence of Events for Restoring a Stack Frame 6-55

Figure 6-31. Nested Calls Create a Chain of Markers on the Stack 6-57

Figure 6-32. Example of Returning a Value to the Caller of a Procedure 6-59

Figure 6-33. Example of Retrieving a Value Returned by a Called Procedure 6-61

Figure 6-34. Subprocedures Return Values Through Sublocal Data Area 6-63

Figure 6-35. Saved Copy of the Environment Register Preserves Space ID

Index 6-65

Figure 6-36. Sequence of Events for an External Procedure Call 6-67

Figure 6-37. Example of Resolving a Virtual Address in User Code Space 6-69

Figure 6-38. Accelerated Programs Files Contain Both TNS and Accelerated

Code 6-71