| Chapter 4 |
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4
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OpenVMS I64 Conventions
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4.1
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Register Usage
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4.1.1
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Partitioning
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4.1.2
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I64 General Register Usage
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4.1.3
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I64 Floating-Point Register Usage
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4.1.4
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I64 Predicate Register Usage
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4.1.5
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I64 Branch Register Usage
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4.1.6
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I64 Application Register Usage
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4.1.7
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Floating-Point Status
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4.1.8
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User Mask
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4.1.9
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Additional Register Usage Information
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4.2
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Address Representation
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4.3
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Procedure Representation
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4.4
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Procedure Types
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4.5
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Memory Stack
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4.5.1
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Procedure Frames
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4.5.2
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Stack Overflow Detection
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4.5.2.1
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Stack Limit Checking
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4.5.2.2
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Methods for Stack Limit Checking
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4.6
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Register Stack
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4.6.1
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Input and Local Registers
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4.6.2
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Output Registers
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4.6.3
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Rotating Registers
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4.6.4
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Frame Markers
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4.6.5
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Backing Store for Register Stack
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4.7
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Procedure Linkage
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4.7.1
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The GP Register
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4.7.2
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Types of Calls
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4.7.3
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Calling Sequence
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4.7.3.1
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Direct Calls
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4.7.3.2
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Indirect Calls
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4.7.4
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Parameter Passing
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4.7.5
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Parameter Passing Mechanisms
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4.7.5.1
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Allocation of Parameter Slots
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4.7.5.2
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Normal Register Parameters
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4.7.5.3
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Argument Information (AI) Register
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4.7.5.4
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Memory Stack Parameters
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4.7.5.5
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Variable Argument Lists
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4.7.5.6
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Pointers to Formal Parameters
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4.7.5.7
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Languages Other than C
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4.7.5.8
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Rounding Floating-point Values
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4.7.5.9
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Order of Argument Evaluation
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4.7.5.10
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Examples
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4.7.6
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Return Values
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4.7.7
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Simple and Bound Procedures
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4.8
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Procedure Call Stack
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4.8.1
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Current Procedure
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4.8.2
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Procedure Call Tracing
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4.8.2.1
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Invocation Context Block
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4.8.2.2
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Invocation Context Handle
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4.8.3
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Invocation Context Block Access Routines
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4.8.3.1
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Initializing the Invocation Context Block
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4.8.3.2
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Walking the Call Stack
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4.8.3.3
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LIB$I64_CREATE_INVO_CONTEXT
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4.8.3.4
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LIB$I64_FREE_INVO_CONTEXT
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4.8.3.5
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LIB$I64_INIT_INVO_CONTEXT
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4.8.3.6
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LIB$I64_GET_INVO_CONTEXT
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4.8.3.7
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LIB$I64_GET_CURR_INVO_CONTEXT
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4.8.3.8
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LIB$I64_GET_PREV_INVO_CONTEXT
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4.8.3.9
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LIB$I64_GET_INVO_HANDLE
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4.8.3.10
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LIB$I64_GET_CURR_INVO_HANDLE
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4.8.3.11
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LIB$I64_GET_PREV_INVO_HANDLE
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4.8.3.12
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LIB$I64_PREV_INVO_END
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4.8.3.13
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LIB$I64_PUT_INVO_REGISTERS
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4.8.4
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Supplemental Invocation Context Access Routines
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4.8.4.1
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LIB$I64_GET_FR
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4.8.4.2
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LIB$I64_SET_FR
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4.8.4.3
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LIB$I64_GET_GR
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4.8.4.4
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LIB$I64_SET_GR
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4.8.4.5
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LIB$I64_SET_PC
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4.8.4.6
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LIB$I64_GET_UNWIND_LSDA
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4.8.4.7
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LIB$I64_GET_UNWIND_OSSD
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4.8.4.8
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LIB$I64_GET_UNWIND_HANDLER_FV
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4.8.4.9
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LIB$I64_IS_EXC_DISPATCH_FRAME
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4.8.4.10
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LIB$I64_IS_AST_DISPATCH_FRAME
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4.8.5
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Invocation Context Callback Routines
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4.8.5.1
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The Get Unwind Information Routine
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4.8.5.2
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The Get Initial Context Routine
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4.8.5.3
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The Read Memory Routine
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4.8.5.4
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The Write Memory Routine
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4.8.5.5
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The Write Register Routine
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4.8.5.6
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The Memory Allocation Routine
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4.8.5.7
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The Memory Deallocation Routine
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4.9
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Data Allocation
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4.9.1
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Alignment
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4.9.2
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Global Data
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4.9.3
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Local Static Data
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4.9.4
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Constants and Literals
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4.9.5
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Record Layout Conventions
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4.9.5.1
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Aligned Record Layout
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4.9.5.2
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OpenVMS VAX Compatible Record Layout
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4.9.6
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Sample Code Sequences
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4.9.6.1
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Addressing Own Data in the Short Data Area
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4.9.6.2
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Addressing External Data or Data in a Long Data Area
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4.9.6.3
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Addressing Literals in the Text Segment
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4.9.6.4
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Materializing Function Pointers
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4.9.6.5
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Jump Tables
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4.9.6.5.1
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Preferred Method
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4.9.6.5.2
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Alternative Method
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