commit c324794cb09d0c6495992c9f6cece6e4c67f8c9f
author Gabe Black <gabeblack@google.com> Thu Sep 27 17:39:41 2012 -0700
committer Stefan Reinauer <stefan.reinauer@coreboot.org> Wed Nov 07 18:30:56 2012 +0100
tree 19bd0320d0e71b3edc095b09278d6dfb5fbbf7b0
parent 5ab20054d3c6e637fbcde46a08d2a3c0891bf658

libpayload: Make the symbols in memory.c weak so they can be overridden.

The implementations for various stdlib functions in libc/memory.c are very
generic and should work under just about any circumstances. They are
unfortunately also very slow. This change makes them weak symbols so that
faster versions can be defined on a per architecture basis which will
automatically take the place of the slow versions.

Change-Id: Ia1ac90d9dcd45962b2a15f61ecc74b0a4676048d
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: http://review.coreboot.org/1725
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)

payloads/libpayload/libc/memory.c

diff --git a/payloads/libpayload/libc/memory.c b/payloads/libpayload/libc/memory.c
index 4757b10..5af8538 100644
--- a/payloads/libpayload/libc/memory.c
+++ b/payloads/libpayload/libc/memory.c
@@ -34,6 +34,9 @@
 #include <libpayload.h>
 
 void *memset(void *s, int c, size_t n)
+	__attribute__((weak, alias("default_memset")));
+
+void *default_memset(void *s, int c, size_t n)
 {
 	char *os = s;
 
@@ -44,6 +47,9 @@
 }
 
 void *memcpy(void *dst, const void *src, size_t n)
+	__attribute__((weak, alias("default_memcpy")));
+
+void *default_memcpy(void *dst, const void *src, size_t n)
 {
 	int i;
 	void *ret = dst;
@@ -62,6 +68,9 @@
 }
 
 void *memmove(void *dst, const void *src, size_t n)
+	__attribute__((weak, alias("default_memmove")));
+
+void *default_memmove(void *dst, const void *src, size_t n)
 {
 	int i;
 	unsigned long offs;
@@ -90,7 +99,11 @@
  * @return If len is 0, return zero. If the areas match, return zero.
  *         Otherwise return non-zero.
  */
+
 int memcmp(const void *s1, const void *s2, size_t len)
+	__attribute__((weak, alias("default_memcmp")));
+
+int default_memcmp(const void *s1, const void *s2, size_t len)
 {
 	for (; len && *(char *)s1++ == *(char *)s2++; len--) ;
 	return len;