This is the closest I get, I am out of ideas. Don't know why it runs but
doesn't update the string.
go run .
test [116 101 115 116 0 0 0 0 0 0] 4 0 0
#include <stdio.h>
#include <string.h>
int hello(char *s) {
char c[80];
strcpy (c, s);
sprintf(s, "hello %s", c);
printf("------\n");
return 0;
}
#include "textflag.h"
TEXT ·hello_trampoline(SB),NOSPLIT,$0-0
JMP hello_c(SB)
package main
import (
"fmt"
"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, unix.Errno) {
return unix.Syscall(funcPC(hello_trampoline), uintptr(s), 0, 0)
}
func hello_trampoline()
//go:nosplit
func funcPC(f func()) uintptr {
return **(**uintptr)(unsafe.Pointer(&f))
}
func main() {
b := make([]byte, 10, 10)
copy(b, []byte("test"))
r1, r2, err := hello_t(unsafe.Pointer(&b[0]))
fmt.Printf("%s %v %d %d %d\n", b, b, r1, r2, err)
}
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