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On-Line Manuals
Cx51 User's Guide
Cx51 Introduction
Compiling Programs
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Customization Files
Startup Code
Variable Initialization Code
XBANKING.A51
Basic I/O
Memory Allocation
Optimizer
Optimizer Options
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8051-Specific Optimizations
Global Register Coloring
Segment Naming Conventions
Data Objects
Program Objects
Parameters and Local Variables
Interfacing C to Assembler
Global Variables
Function Parameters
Passing in Memory
Passing in Registers
Function Return Values
Using the SRC Directive
Register Usage
Overlaying Segments
Small Model Example
Compact Model Example
Large Model Example
Interfacing C programs to PL/M-51
Data Storage Formats
Bit Variables
1-Byte Scalars
2-Byte Scalars
4-Byte Scalars
Generic and Far Pointers
Floating-point Numbers
Floating-point Errors
Absolute Memory Locations
Absolute Access Macros
Linker Location Controls
The _at_ Keyword
Debugging
8051 Derivatives
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Library Reference
Appendix
Function Parameters
By default, C functions pass up to three parameters in registers. Remaining parameters are passed in fixed memory locations. You may use the NOREGPARMS directive to disable passing parameters in registers.
Parameters are passed in fixed memory locations if parameter passing in registers is disabled or if there are too many parameters to fit in registers. Functions that pass parameters in registers are flagged by the Cx51 Compiler with an underscore character ('_') prefixed to the function name at code generation time.
Functions that pass parameters only in fixed memory locations are not prefixed with an underscore. Refer to Using the SRC Directive for an example.
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