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-rw-r--r--arch/s390/lib/Makefile3
-rw-r--r--arch/s390/lib/mem32.S92
-rw-r--r--arch/s390/lib/mem64.S88
-rw-r--r--arch/s390/lib/string.c56
4 files changed, 187 insertions, 52 deletions
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index 761ab8b..6ab0d0b 100644
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -4,6 +4,7 @@
lib-y += delay.o string.o uaccess_std.o uaccess_pt.o
obj-y += usercopy.o
-obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o
+obj-$(CONFIG_32BIT) += div64.o qrnnd.o ucmpdi2.o mem32.o
+obj-$(CONFIG_64BIT) += mem64.o
lib-$(CONFIG_64BIT) += uaccess_mvcos.o
lib-$(CONFIG_SMP) += spinlock.o
diff --git a/arch/s390/lib/mem32.S b/arch/s390/lib/mem32.S
new file mode 100644
index 0000000..14ca924
--- /dev/null
+++ b/arch/s390/lib/mem32.S
@@ -0,0 +1,92 @@
+/*
+ * String handling functions.
+ *
+ * Copyright IBM Corp. 2012
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * memset implementation
+ *
+ * This code corresponds to the C construct below. We do distinguish
+ * between clearing (c == 0) and setting a memory array (c != 0) simply
+ * because nearly all memset invocations in the kernel clear memory and
+ * the xc instruction is preferred in such cases.
+ *
+ * void *memset(void *s, int c, size_t n)
+ * {
+ * if (likely(c == 0))
+ * return __builtin_memset(s, 0, n);
+ * return __builtin_memset(s, c, n);
+ * }
+ */
+ENTRY(memset)
+ basr %r5,%r0
+.Lmemset_base:
+ ltr %r4,%r4
+ bzr %r14
+ ltr %r3,%r3
+ jnz .Lmemset_fill
+ ahi %r4,-1
+ lr %r3,%r4
+ srl %r3,8
+ ltr %r3,%r3
+ lr %r1,%r2
+ je .Lmemset_clear_rest
+.Lmemset_clear_loop:
+ xc 0(256,%r1),0(%r1)
+ la %r1,256(%r1)
+ brct %r3,.Lmemset_clear_loop
+.Lmemset_clear_rest:
+ ex %r4,.Lmemset_xc-.Lmemset_base(%r5)
+ br %r14
+.Lmemset_fill:
+ stc %r3,0(%r2)
+ chi %r4,1
+ lr %r1,%r2
+ ber %r14
+ ahi %r4,-2
+ lr %r3,%r4
+ srl %r3,8
+ ltr %r3,%r3
+ je .Lmemset_fill_rest
+.Lmemset_fill_loop:
+ mvc 1(256,%r1),0(%r1)
+ la %r1,256(%r1)
+ brct %r3,.Lmemset_fill_loop
+.Lmemset_fill_rest:
+ ex %r4,.Lmemset_mvc-.Lmemset_base(%r5)
+ br %r14
+.Lmemset_xc:
+ xc 0(1,%r1),0(%r1)
+.Lmemset_mvc:
+ mvc 1(1,%r1),0(%r1)
+
+/*
+ * memcpy implementation
+ *
+ * void *memcpy(void *dest, const void *src, size_t n)
+ */
+ENTRY(memcpy)
+ basr %r5,%r0
+.Lmemcpy_base:
+ ltr %r4,%r4
+ bzr %r14
+ ahi %r4,-1
+ lr %r0,%r4
+ srl %r0,8
+ ltr %r0,%r0
+ lr %r1,%r2
+ jnz .Lmemcpy_loop
+.Lmemcpy_rest:
+ ex %r4,.Lmemcpy_mvc-.Lmemcpy_base(%r5)
+ br %r14
+.Lmemcpy_loop:
+ mvc 0(256,%r1),0(%r3)
+ la %r1,256(%r1)
+ la %r3,256(%r3)
+ brct %r0,.Lmemcpy_loop
+ j .Lmemcpy_rest
+.Lmemcpy_mvc:
+ mvc 0(1,%r1),0(%r3)
diff --git a/arch/s390/lib/mem64.S b/arch/s390/lib/mem64.S
new file mode 100644
index 0000000..c6d553e
--- /dev/null
+++ b/arch/s390/lib/mem64.S
@@ -0,0 +1,88 @@
+/*
+ * String handling functions.
+ *
+ * Copyright IBM Corp. 2012
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * memset implementation
+ *
+ * This code corresponds to the C construct below. We do distinguish
+ * between clearing (c == 0) and setting a memory array (c != 0) simply
+ * because nearly all memset invocations in the kernel clear memory and
+ * the xc instruction is preferred in such cases.
+ *
+ * void *memset(void *s, int c, size_t n)
+ * {
+ * if (likely(c == 0))
+ * return __builtin_memset(s, 0, n);
+ * return __builtin_memset(s, c, n);
+ * }
+ */
+ENTRY(memset)
+ ltgr %r4,%r4
+ bzr %r14
+ ltgr %r3,%r3
+ jnz .Lmemset_fill
+ aghi %r4,-1
+ srlg %r3,%r4,8
+ ltgr %r3,%r3
+ lgr %r1,%r2
+ jz .Lmemset_clear_rest
+.Lmemset_clear_loop:
+ xc 0(256,%r1),0(%r1)
+ la %r1,256(%r1)
+ brctg %r3,.Lmemset_clear_loop
+.Lmemset_clear_rest:
+ larl %r3,.Lmemset_xc
+ ex %r4,0(%r3)
+ br %r14
+.Lmemset_fill:
+ stc %r3,0(%r2)
+ cghi %r4,1
+ lgr %r1,%r2
+ ber %r14
+ aghi %r4,-2
+ srlg %r3,%r4,8
+ ltgr %r3,%r3
+ jz .Lmemset_fill_rest
+.Lmemset_fill_loop:
+ mvc 1(256,%r1),0(%r1)
+ la %r1,256(%r1)
+ brctg %r3,.Lmemset_fill_loop
+.Lmemset_fill_rest:
+ larl %r3,.Lmemset_mvc
+ ex %r4,0(%r3)
+ br %r14
+.Lmemset_xc:
+ xc 0(1,%r1),0(%r1)
+.Lmemset_mvc:
+ mvc 1(1,%r1),0(%r1)
+
+/*
+ * memcpy implementation
+ *
+ * void *memcpy(void *dest, const void *src, size_t n)
+ */
+ENTRY(memcpy)
+ ltgr %r4,%r4
+ bzr %r14
+ aghi %r4,-1
+ srlg %r5,%r4,8
+ ltgr %r5,%r5
+ lgr %r1,%r2
+ jnz .Lmemcpy_loop
+.Lmemcpy_rest:
+ larl %r5,.Lmemcpy_mvc
+ ex %r4,0(%r5)
+ br %r14
+.Lmemcpy_loop:
+ mvc 0(256,%r1),0(%r3)
+ la %r1,256(%r1)
+ la %r3,256(%r3)
+ brctg %r5,.Lmemcpy_loop
+ j .Lmemcpy_rest
+.Lmemcpy_mvc:
+ mvc 0(1,%r1),0(%r3)
diff --git a/arch/s390/lib/string.c b/arch/s390/lib/string.c
index 846ec64..b647d5f 100644
--- a/arch/s390/lib/string.c
+++ b/arch/s390/lib/string.c
@@ -43,11 +43,7 @@ static inline char *__strnend(const char *s, size_t n)
*/
size_t strlen(const char *s)
{
-#if __GNUC__ < 4
return __strend(s) - s;
-#else
- return __builtin_strlen(s);
-#endif
}
EXPORT_SYMBOL(strlen);
@@ -73,7 +69,6 @@ EXPORT_SYMBOL(strnlen);
*/
char *strcpy(char *dest, const char *src)
{
-#if __GNUC__ < 4
register int r0 asm("0") = 0;
char *ret = dest;
@@ -82,9 +77,6 @@ char *strcpy(char *dest, const char *src)
: "+&a" (dest), "+&a" (src) : "d" (r0)
: "cc", "memory" );
return ret;
-#else
- return __builtin_strcpy(dest, src);
-#endif
}
EXPORT_SYMBOL(strcpy);
@@ -106,7 +98,7 @@ size_t strlcpy(char *dest, const char *src, size_t size)
if (size) {
size_t len = (ret >= size) ? size-1 : ret;
dest[len] = '\0';
- __builtin_memcpy(dest, src, len);
+ memcpy(dest, src, len);
}
return ret;
}
@@ -124,8 +116,8 @@ EXPORT_SYMBOL(strlcpy);
char *strncpy(char *dest, const char *src, size_t n)
{
size_t len = __strnend(src, n) - src;
- __builtin_memset(dest + len, 0, n - len);
- __builtin_memcpy(dest, src, len);
+ memset(dest + len, 0, n - len);
+ memcpy(dest, src, len);
return dest;
}
EXPORT_SYMBOL(strncpy);
@@ -171,7 +163,7 @@ size_t strlcat(char *dest, const char *src, size_t n)
if (len >= n)
len = n - 1;
dest[len] = '\0';
- __builtin_memcpy(dest, src, len);
+ memcpy(dest, src, len);
}
return res;
}
@@ -194,7 +186,7 @@ char *strncat(char *dest, const char *src, size_t n)
char *p = __strend(dest);
p[len] = '\0';
- __builtin_memcpy(p, src, len);
+ memcpy(p, src, len);
return dest;
}
EXPORT_SYMBOL(strncat);
@@ -348,41 +340,3 @@ void *memscan(void *s, int c, size_t n)
return (void *) ret;
}
EXPORT_SYMBOL(memscan);
-
-/**
- * memcpy - Copy one area of memory to another
- * @dest: Where to copy to
- * @src: Where to copy from
- * @n: The size of the area.
- *
- * returns a pointer to @dest
- */
-void *memcpy(void *dest, const void *src, size_t n)
-{
- return __builtin_memcpy(dest, src, n);
-}
-EXPORT_SYMBOL(memcpy);
-
-/**
- * memset - Fill a region of memory with the given value
- * @s: Pointer to the start of the area.
- * @c: The byte to fill the area with
- * @n: The size of the area.
- *
- * returns a pointer to @s
- */
-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);
- return s;
-}
-EXPORT_SYMBOL(memset);
generated by cgit v0.10.2 at 2024-08-02 12:03:06 (GMT)