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This article is to explain what OpenPOWER application binary interface
(ABI)introduces to improve performance of function call. Different from the 64-bit
PowerPC ELF ABI Supplement 1.9 (ELF ABI v1), OpenPOWER ABI gets rid of function
descriptor and doesn't require callers to initialize environment any more. Aligned with
current industry practice, it makes the callees set up the TOC pointer in place,
introduces dual entry to ensure the establishment as required, and uses trampoline to
support lexical nesting function calls.
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