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-rw-r--r--libc/string/generic/memmove.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/libc/string/generic/memmove.c b/libc/string/generic/memmove.c
index 1ac018013..5389cc029 100644
--- a/libc/string/generic/memmove.c
+++ b/libc/string/generic/memmove.c
@@ -23,8 +23,9 @@
#include "memcopy.h"
#include "pagecopy.h"
-#ifndef __ARCH_HAS_BWD_MEMCPY__
+#if defined(__ARCH_HAS_BWD_MEMCPY__) || defined(__mips__)
/* generic-opt memmove assumes memcpy does forward copying! */
+/* also needed for MIPS as its memcpy does not support overlapping regions */
#include "_memcpy_fwd.c"
#endif
@@ -224,8 +225,11 @@ void *memmove (void *dest, const void *src, size_t len)
Reduces the working set. */
if (dstp - srcp >= len) /* *Unsigned* compare! */
{
-#ifdef __ARCH_HAS_BWD_MEMCPY__
- /* Backward memcpy implementation can be used */
+ /* Calling memcpy() from memmove() should be skipped in two cases:
+ * a) if arch's memcpy uses a backward copying (SH4)
+ * b) if arch's memcpy is not fully safe for overlapping regions (MIPS)
+ */
+#if !defined(__ARCH_HAS_BWD_MEMCPY_) && !defined(__mips__)
memcpy(dest, src, len);
#else
/* Copy from the beginning to the end. */