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From: Jan Beulich <jbeulich@suse.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
	George Dunlap <george.dunlap@citrix.com>,
	Ian Jackson <iwj@xenproject.org>, Julien Grall <julien@xen.org>,
	Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>
Subject: [PATCH v2 03/20] lib: move memmove()
Date: Wed, 21 Apr 2021 16:19:25 +0200	[thread overview]
Message-ID: <2eb9714b-3506-1216-1ce8-35ea000a37da@suse.com> (raw)
In-Reply-To: <3ae091ce-6f6c-3ec6-abd3-4490239a707f@suse.com>

By moving the function into an archive, x86 doesn't need to announce
anymore that is has its own implementation - symbol resolution by the
linker will now guarantee that the generic function remains unused, and
the forwarding to the compiler built-in gets done by the common header
anyway.

Allow the function to be individually linkable, discardable, and
overridable.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -311,36 +311,6 @@ char *(strstr)(const char *s1, const cha
 }
 #endif
 
-#ifndef __HAVE_ARCH_MEMMOVE
-/**
- * memmove - Copy one area of memory to another
- * @dest: Where to copy to
- * @src: Where to copy from
- * @count: The size of the area.
- *
- * Unlike memcpy(), memmove() copes with overlapping areas.
- */
-void *(memmove)(void *dest, const void *src, size_t count)
-{
-	char *tmp, *s;
-
-	if (dest <= src) {
-		tmp = (char *) dest;
-		s = (char *) src;
-		while (count--)
-			*tmp++ = *s++;
-		}
-	else {
-		tmp = (char *) dest + count;
-		s = (char *) src + count;
-		while (count--)
-			*--tmp = *--s;
-		}
-
-	return dest;
-}
-#endif
-
 #ifndef __HAVE_ARCH_MEMCMP
 /**
  * memcmp - Compare two areas of memory
--- a/xen/include/asm-x86/string.h
+++ b/xen/include/asm-x86/string.h
@@ -1,9 +1,6 @@
 #ifndef __X86_STRING_H__
 #define __X86_STRING_H__
 
-#define __HAVE_ARCH_MEMMOVE
-#define memmove(d, s, n) __builtin_memmove(d, s, n)
-
 #endif /* __X86_STRING_H__ */
 /*
  * Local variables:
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -5,6 +5,7 @@ lib-y += ctors.o
 lib-y += ctype.o
 lib-y += list-sort.o
 lib-y += memcpy.o
+lib-y += memmove.o
 lib-y += memset.o
 lib-y += muldiv64.o
 lib-y += parse-size.o
--- /dev/null
+++ b/xen/lib/memmove.c
@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * memmove - Copy one area of memory to another
+ * @dest: Where to copy to
+ * @src: Where to copy from
+ * @count: The size of the area.
+ *
+ * Unlike memcpy(), memmove() copes with overlapping areas.
+ */
+void *(memmove)(void *dest, const void *src, size_t count)
+{
+	char *tmp, *s;
+
+	if (dest <= src) {
+		tmp = (char *) dest;
+		s = (char *) src;
+		while (count--)
+			*tmp++ = *s++;
+	} else {
+		tmp = (char *) dest + count;
+		s = (char *) src + count;
+		while (count--)
+			*--tmp = *--s;
+	}
+
+	return dest;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */



  parent reply	other threads:[~2021-04-21 14:19 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21 14:15 [PATCH v2 00/20] further population of xen/lib/ Jan Beulich
2021-04-21 14:18 ` [PATCH v2 01/20] lib: move memset() Jan Beulich
2021-04-21 14:18 ` [PATCH v2 02/20] lib: move memcpy() Jan Beulich
2021-04-21 14:19 ` Jan Beulich [this message]
2021-04-21 14:19 ` [PATCH v2 04/20] lib: move memcmp() Jan Beulich
2021-04-21 14:20 ` [PATCH v2 05/20] lib: move memchr() Jan Beulich
2021-04-21 14:20 ` [PATCH v2 06/20] lib: move memchr_inv() Jan Beulich
2021-04-21 14:22 ` [PATCH v2 07/20] lib: move strlen() Jan Beulich
2021-04-21 14:22 ` [PATCH v2 08/20] lib: move strnlen() Jan Beulich
2021-04-21 14:22 ` [PATCH v2 09/20] lib: move strcmp() Jan Beulich
2021-04-21 14:23 ` [PATCH v2 10/20] lib: move strncmp() Jan Beulich
2021-04-21 14:23 ` [PATCH v2 11/20] lib: move strlcpy() Jan Beulich
2021-04-21 14:24 ` [PATCH v2 12/20] lib: move strlcat() Jan Beulich
2021-04-21 14:24 ` [PATCH v2 13/20] lib: move strchr() Jan Beulich
2021-04-21 14:24 ` [PATCH v2 14/20] lib: move strrchr() Jan Beulich
2021-04-21 14:25 ` [PATCH v2 15/20] lib: move strstr() Jan Beulich
2021-04-21 14:25 ` [PATCH v2 16/20] lib: move strcasecmp() Jan Beulich
2021-04-21 14:25 ` [PATCH v2 17/20] lib: move/rename strnicmp() to strncasecmp() Jan Beulich
2021-04-21 19:20   ` Julien Grall
2021-04-21 14:26 ` [PATCH v2 18/20] lib: move strspn() Jan Beulich
2021-04-21 14:26 ` [PATCH v2 19/20] lib: move strpbrk() Jan Beulich
2021-04-21 14:26 ` [PATCH v2 20/20] lib: move strsep() Jan Beulich
2021-04-21 19:21 ` [PATCH v2 00/20] further population of xen/lib/ Julien Grall

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