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-rw-r--r--payloads/libpayload/libc/memory.c34
1 files changed, 24 insertions, 10 deletions
diff --git a/payloads/libpayload/libc/memory.c b/payloads/libpayload/libc/memory.c
index 1adfb3207f..2c44764edb 100644
--- a/payloads/libpayload/libc/memory.c
+++ b/payloads/libpayload/libc/memory.c
@@ -66,13 +66,17 @@ static void *default_memcpy(void *dst, const void *src, size_t n)
size_t i;
void *ret = dst;
- for(i = 0; i < n / sizeof(unsigned long); i++)
- ((unsigned long *)dst)[i] = ((unsigned long *)src)[i];
+ if (IS_ALIGNED((uintptr_t)dst, sizeof(unsigned long)) &&
+ IS_ALIGNED((uintptr_t)src, sizeof(unsigned long))) {
+ for (i = 0; i < n / sizeof(unsigned long); i++)
+ ((unsigned long *)dst)[i] = ((unsigned long *)src)[i];
- src += i * sizeof(unsigned long);
- dst += i * sizeof(unsigned long);
+ src += i * sizeof(unsigned long);
+ dst += i * sizeof(unsigned long);
+ n -= i * sizeof(unsigned long);
+ }
- for(i = 0; i < n % sizeof(unsigned long); i++)
+ for (i = 0; i < n; i++)
((u8 *)dst)[i] = ((u8 *)src)[i];
return ret;
@@ -89,6 +93,13 @@ static void *default_memmove(void *dst, const void *src, size_t n)
if (src > dst)
return memcpy(dst, src, n);
+ if (!IS_ALIGNED((uintptr_t)dst, sizeof(unsigned long)) ||
+ !IS_ALIGNED((uintptr_t)src, sizeof(unsigned long))) {
+ for (i = n - 1; i >= 0; i--)
+ ((u8 *)dst)[i] = ((u8 *)src)[i];
+ return dst;
+ }
+
offs = n - (n % sizeof(unsigned long));
for (i = (n % sizeof(unsigned long)) - 1; i >= 0; i--)
@@ -116,11 +127,14 @@ void *memmove(void *dst, const void *src, size_t n)
static int default_memcmp(const void *s1, const void *s2, size_t n)
{
- size_t i;
-
- for (i = 0; i < n / sizeof(unsigned long); i++)
- if (((unsigned long *)s1)[i] != ((unsigned long *)s2)[i])
- break; /* fall through to find differing byte */
+ size_t i = 0;
+ const unsigned long *w1 = s1, *w2 = s2;
+
+ if (IS_ALIGNED((uintptr_t)s1, sizeof(unsigned long)) &&
+ IS_ALIGNED((uintptr_t)s2, sizeof(unsigned long)))
+ for (; i < n / sizeof(unsigned long); i++)
+ if (w1[i] != w2[i])
+ break; /* fall through to find differing byte */
for (i *= sizeof(unsigned long); i < n; i++)
if (((u8 *)s1)[i] != ((u8 *)s2)[i])