How to call go assembly function from cgo

Getting Help
1

I want to call a function written in go assembly from cgo . Example
runtime·memclrNoHeapPointers is written in memclr_amd64.s.
I am able to call it from go code but not from cgo code.

2

What if you export a “stub.” There’s probably a way to put this all into one function, but I haven’t looked into it yet.

//go:linkname MemclrNoHeapPointers runtime.memclrNoHeapPointers
func MemclrNoHeapPointers(p unsafe.Pointer, n uintptr) int

//export RuntimeMemclrNoHeapPointers
func RuntimeMemclrNoHeapPointers(p unsafe.Pointer, n uintptr) {
    MemclrNoHeapPointers(p, n)
}

I think you could call RuntimeMemclrNoHeapPointers from C, but I’m not certain.

What’s your use case?

3

By exporting a stub, cgo will call a function of go. What if i do not call any go method from cgo.

I want to call following function from cgo.

TEXT ·getg(SB), NOSPLIT, $0-8
get_tls(CX)
MOVQ g(CX), AX
MOVQ AX, ret+0(FP)
RET

4

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