NonStop S-Series Server Description Manual (G06.24+)

Contents

HP NonStop S-Series Server Description Manual—520331-003

Figures

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

Figure 6-39.

Switching Modes for System Calls and Translation Assistance 6-73

Figure 6-40. Accelerated Procedure Return Requires Access to TNS

Information 6-75

Figure 6-41. Pmap Is a Cross-Reference of Code Segment Addresses 6-77

Figure 6-42. Gateway Tables Provide Privileged-Mode Transitions for Accelerated

Code 6-79

Figure 6-43. Far Jump Tables Are Needed for Calls To and From System

Code 6-81

Figure 6-44. Most TNS State Values Are Kept in RISC General-Purpose

Registers 6-83

Figure 6-45. Invoking Privilege Always Requires Taking an Exception 6-85

Figure 7-1. RISC Registers Point to Global Data, Main Stack Tip, and Return

Address 7-3