Linux Standard Base Specification for the PPC32 Architecture 1.2
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Chapter 3. Function Calling Sequence

Table of Contents
CPU Registers
Floating Point Registers
Stack Frame
Arguments
Return Values

LSB-conforming applications shall use the function calling sequence as defined in Chapter 3 of the System V Application Binary Interface PowerPC Processor Supplement.

CPU Registers

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Data RepresentationUpFloating Point Registers