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Merge pull request #300 from RalfJung/panic 

avoid ptr::write which might panic in debug mode
master
Alex Crichton 2019-07-15 09:22:12 -05:00 committed by GitHub
parent 5e06435c29 25edd204fa
commit 1ace961257
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1 changed files with 3 additions and 6 deletions
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9
src/arm.rs
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@ -135,13 +135,12 @@ pub unsafe extern "aapcs" fn __aeabi_memcpy(dest: *mut u8, src: *const u8, n: us
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
pub unsafe extern "aapcs" fn __aeabi_memcpy4(dest: *mut u8, src: *const u8, mut n: usize) {
use core::ptr;
// We are guaranteed 4-alignment, so accessing at u32 is okay.
let mut dest = dest as *mut u32;
let mut src = src as *mut u32;
while n >= 4 {
ptr::write(dest, ptr::read(src));
*dest = *src;
dest = dest.offset(1);
src = src.offset(1);
n -= 4;
@ -190,15 +189,13 @@ pub unsafe extern "aapcs" fn __aeabi_memset(dest: *mut u8, n: usize, c: i32) {
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
pub unsafe extern "aapcs" fn __aeabi_memset4(dest: *mut u8, mut n: usize, c: i32) {
use core::ptr;
let mut dest = dest as *mut u32;
let byte = (c as u32) & 0xff;
let c = (byte << 24) | (byte << 16) | (byte << 8) | byte;
while n >= 4 {
ptr::write(dest, c);
*dest = c;
dest = dest.offset(1);
n -= 4;
}