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#![cfg(all(
target_arch = "arm",
not(any(target_env = "gnu", target_env = "musl")),
target_os = "linux",
feature = "mem"
))]
#![feature(compiler_builtins_lib)]
#![no_std]
extern crate compiler_builtins;
// test runner
extern crate utest_cortex_m_qemu;
// overrides `panic!`
#[macro_use]
extern crate utest_macros;
macro_rules! panic {
($($tt:tt)*) => {
upanic!($($tt)*);
};
}
// SAFETY: defined in compiler-builtins
unsafe extern "aapcs" {
fn __aeabi_memcpy(dest: *mut u8, src: *const u8, n: usize);
fn __aeabi_memcpy4(dest: *mut u8, src: *const u8, n: usize);
}
struct Aligned {
array: [u8; 8],
_alignment: [u32; 0],
}
impl Aligned {
fn new(array: [u8; 8]) -> Self {
Aligned {
array: array,
_alignment: [],
}
}
}
#[test]
fn memcpy() {
let mut dest = [0; 4];
let src = [0xde, 0xad, 0xbe, 0xef];
for n in 0..dest.len() {
dest.copy_from_slice(&[0; 4]);
unsafe { __aeabi_memcpy(dest.as_mut_ptr(), src.as_ptr(), n) }
assert_eq!(&dest[0..n], &src[0..n])
}
}
#[test]
fn memcpy4() {
let mut aligned = Aligned::new([0; 8]);
let dest = &mut aligned.array;
let src = [0xde, 0xad, 0xbe, 0xef, 0xba, 0xad, 0xf0, 0x0d];
for n in 0..dest.len() {
dest.copy_from_slice(&[0; 8]);
unsafe { __aeabi_memcpy4(dest.as_mut_ptr(), src.as_ptr(), n) }
assert_eq!(&dest[0..n], &src[0..n])
}
}
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