28 lines
630 B
Rust
28 lines
630 B
Rust
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#![crate_type = "cdylib"]
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#![crate_name = "foo"]
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use std::arch::asm;
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use std::ffi::{CStr, CString};
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use std::os::raw::c_char;
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extern "C" {
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fn bar(ptr: *const c_char);
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}
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#[no_mangle]
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pub extern "C" fn foo(ptr: *const c_char) {
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assert_eq!((ptr as usize) >> 56, 0x1f);
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let s = unsafe { CStr::from_ptr(ptr) };
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assert_eq!(s.to_str().unwrap(), "ab");
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let s = CString::from_vec_with_nul("cd\0".into()).unwrap();
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let mut p = ((s.as_ptr() as usize) | (0x2f << 56)) as *const c_char;
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unsafe {
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#[cfg(target_feature = "mte")]
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asm!("stg {p}, [{p}]", p = inout(reg) p);
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bar(p);
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}
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}
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