I am getting it to compile and run with this but I am struggling how you
send a string pointer across a syscall that c can send back. Also not sure
about the //go:nosplit I sprinkel around which one is actually right?
package main
import (
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
//go:linkname hello_t hello_c
//go:cgo_import_dynamic hello_c hello "./c/hello.dylib"
//go:nosplit
func hello_t(s unsafe.Pointer) (uintptr, uintptr, syscall.Errno) {
return unix.Syscall6(funcPC(hello_trampoline), uintptr(s), uintptr(0),
0, 0, uintptr(s), 0)
}
func hello_trampoline()
//go:nosplit
func funcPC(f func()) uintptr {
return **(**uintptr)(unsafe.Pointer(&f))
}
func main() {
s := "test "
hello_t(unsafe.Pointer(&s))
print(s)
}
> go build
> ./trampoline
> test %
>
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