From ebeace71ce4734b4382904db4b3aa619ac9fef16 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sat, 13 Jul 2019 10:55:54 +0200
Subject: [PATCH] avoid ptr::write which might panic in debug mode

---
 src/arm.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/arm.rs b/src/arm.rs
index 9bfffb7..ab35ec9 100644
--- a/src/arm.rs
+++ b/src/arm.rs
@@ -137,11 +137,12 @@ pub unsafe extern "aapcs" fn __aeabi_memcpy(dest: *mut u8, src: *const u8, n: us
 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;
@@ -198,7 +199,7 @@ pub unsafe extern "aapcs" fn __aeabi_memset4(dest: *mut u8, mut n: usize, c: i32
     let c = (byte << 24) | (byte << 16) | (byte << 8) | byte;
 
     while n >= 4 {
-        ptr::write(dest, c);
+        *dest = c;
         dest = dest.offset(1);
         n -= 4;
     }