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C251 User's Guide
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Startup Code Variable Initialization Code Basic I/O Memory Allocation Optimizer General Optimizations 251-Specific Optimizations Options for Code Generation Global Register Coloring Segment Naming Conventions Segment Types Initialization Segments Function Symbols Parameter Passing Symbols Hardware Stack Calculating Stack Size Interfacing C Programs to Assembler Global Variables Function Parameters Passing in Memory Passing in Registers Function Return Values Using the SRC Directive Register Usage Overlaying Segments TINY Model XTINY Model SMALL Model XSMALL Model LARGE Model Data Storage Formats Bit Variables 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars Floating-point Numbers Floating-point Errors Double Numbers Double Errors Absolute Memory Locations Absolute Access Macros Linker Location Controls The _at_ Keyword Debugging Error Messages Library Reference AppendixInitialization Segments
Segments which contain initialization data or code have fixed predefined names. The information in these segments is used in the startup code which is executed prior to the main function.
| Segment Name Prefix | Memory Class | Description |
|---|---|---|
| ?C_INITEDATA? | NCONST | Contains initialization values for data, idata, and near variables. |
| ?C_INITHDATA? | NCONST | Contains initialization values for xdata, far and huge variables. |
| ?C_C251STARTUP? ?C_C251STARTUP1?.. ?C_C251STARTUP3? | CODE | Startup code for the C main function. Most of the startup code is contained in the files START251.A51, INITEDAT.A51, and INITHDAT.A51. However, the startup code also contains initialization code for bits and small data objects which are stored in a C251 generated segment. The L251 Linker/Locater locates all startup segments in ascending order without gaps. |
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