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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-08-14 13:20:20 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-09-26 15:44:50 +0200
commit535c611ddd3eb076f96579131e30bc5dd02a3b1c (patch)
treef6e3fdb6c8870ab01e35e79a4f017c6f6a365fda /arch/s390/boot
parent68d9884dbc4215b6693c108eb35a02bd78f7956e (diff)
s390/string: provide asm lib functions for memcpy and memcmp
Our memcpy and memcmp variants were implemented by calling the corresponding gcc builtin variants. However gcc is free to replace a call to __builtin_memcmp with a call to memcmp which, when called, will result in an endless recursion within memcmp. So let's provide asm variants and also fix the variants that are used for uncompressing the kernel image. In addition remove all other occurences of builtin function calls. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/boot')
-rw-r--r--arch/s390/boot/compressed/misc.c45
1 files changed, 24 insertions, 21 deletions
diff --git a/arch/s390/boot/compressed/misc.c b/arch/s390/boot/compressed/misc.c
index 465eca756feb..c4c6a1cf221b 100644
--- a/arch/s390/boot/compressed/misc.c
+++ b/arch/s390/boot/compressed/misc.c
@@ -71,34 +71,37 @@ void *memset(void *s, int c, size_t n)
{
char *xs;
- if (c == 0)
- return __builtin_memset(s, 0, n);
-
- xs = (char *) s;
- if (n > 0)
- do {
- *xs++ = c;
- } while (--n > 0);
+ xs = s;
+ while (n--)
+ *xs++ = c;
return s;
}
-void *memcpy(void *__dest, __const void *__src, size_t __n)
+void *memcpy(void *dest, const void *src, size_t n)
{
- return __builtin_memcpy(__dest, __src, __n);
+ const char *s = src;
+ char *d = dest;
+
+ while (n--)
+ *d++ = *s++;
+ return dest;
}
-void *memmove(void *__dest, __const void *__src, size_t __n)
+void *memmove(void *dest, const void *src, size_t n)
{
- char *d;
- const char *s;
-
- if (__dest <= __src)
- return __builtin_memcpy(__dest, __src, __n);
- d = __dest + __n;
- s = __src + __n;
- while (__n--)
- *--d = *--s;
- return __dest;
+ const char *s = src;
+ char *d = dest;
+
+ if (d <= s) {
+ while (n--)
+ *d++ = *s++;
+ } else {
+ d += n;
+ s += n;
+ while (n--)
+ *--d = *--s;
+ }
+ return dest;
}
static void error(char *x)

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