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S390X stabilize backchain #2317

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S390X stabilize backchain #2317

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1 change: 1 addition & 0 deletions src/attributes/codegen.md
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Expand Up @@ -715,6 +715,7 @@ Feature | Implicitly Enables |
`miscellaneous-extensions-2` | | miscellaneous extensions 2
`miscellaneous-extensions-3` | | miscellaneous extensions 3
`miscellaneous-extensions-4` | | miscellaneous extensions 4
`backchain` | | store the caller's frame address in the callee's stack frame backchain slot

@DanielEScherzer DanielEScherzer Jul 28, 2026 •
edited by rustbot
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a quick PDF search of the [z/Architecture Principles of Operation] PDF doesn't have any hits for "backchain" - is there some other documentation that might be worth linking to?

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@fneddy fneddy Jul 29, 2026

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oh yes the PoP does only describe the ISA. the ABI is described here: https://ibm.github.io/s390x-abi/ and i think due to "historic reasons" its called "back chain"(with a space). Should I add a reference to the md?

@DanielEScherzer DanielEScherzer Jul 29, 2026

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I would suggest yes (and maybe with a note that it has a space in that document)


[z/Architecture Principles of Operation]: https://publibfp.dhe.ibm.com/epubs/pdf/a227832d.pdf

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