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cmd/cgo: cgo with external linking for linux/mips64 #14126

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eswierk opened this issue Jan 27, 2016 · 4 comments
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cmd/cgo: cgo with external linking for linux/mips64 #14126

eswierk opened this issue Jan 27, 2016 · 4 comments
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@eswierk
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eswierk commented Jan 27, 2016

Implement cgo with external linking for linux/mips64 and linux/mips64le (MIPS N64 ELF ABI, big- and little-endian). Work includes:

Initial testing can be done using qemu-user for mips64 and mips64le targets running on any host. Skyport Systems (my employer) can also provide access to mips64le hardware for testing.

See #8912 for a description of similar work for ppc64 (though internal linking support is optional/extra credit). For a working example, browse the current arm64 code, which supports exactly the functionality sought for mips64 (cgo with external linking, not internal linking).
@eswierk eswierk mentioned this issue Jan 27, 2016
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@eswierk
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eswierk commented Jan 28, 2016

Background info, for the benefit of a potential bounty hunter...

How cgo works, from the horse’s mouth. Plus an explanation of golang's odd x86-ish assembly language. Some of the links to Plan9 docs are broken; use this archive instead.

The Altoros blog series on golang internals has lots of useful info about code generation, linking, relocations, assembly.

Explanation of golang’s clever conditional compilation features (build tags and magic filenames).

For brushing up on MIPS trivia: N32/N64 ABI and other ABIs, ELF relocation types.

There is probably some overlap with the voodoo that needs to be added to libffi to support closures with gccgo on mips64.

@minux
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minux commented Jan 28, 2016 via email

@eswierk
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eswierk commented Jan 28, 2016

@minux We only have little endian mips64 currently. Would that be useful to you?

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CL https://golang.org/cl/19809 mentions this issue.

@vanloswang vanloswang mentioned this issue Apr 7, 2016
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@bradfitz bradfitz added this to the Unplanned milestone Apr 8, 2016
@karalabe karalabe mentioned this issue May 3, 2016
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