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-rw-r--r--arch/s390/lib/string.c182
1 files changed, 79 insertions, 103 deletions
diff --git a/arch/s390/lib/string.c b/arch/s390/lib/string.c
index 0e30e6e43b0c..7d8741818239 100644
--- a/arch/s390/lib/string.c
+++ b/arch/s390/lib/string.c
@@ -8,6 +8,9 @@
*/
#define IN_ARCH_STRING_C 1
+#ifndef __NO_FORTIFY
+# define __NO_FORTIFY
+#endif
#include <linux/types.h>
#include <linux/string.h>
@@ -18,23 +21,30 @@
*/
static inline char *__strend(const char *s)
{
- register unsigned long r0 asm("0") = 0;
-
- asm volatile ("0: srst %0,%1\n"
- " jo 0b"
- : "+d" (r0), "+a" (s) : : "cc", "memory");
- return (char *) r0;
+ unsigned long e = 0;
+
+ asm volatile(
+ " lghi 0,0\n"
+ "0: srst %[e],%[s]\n"
+ " jo 0b\n"
+ : [e] "+&a" (e), [s] "+&a" (s)
+ :
+ : "cc", "memory", "0");
+ return (char *)e;
}
static inline char *__strnend(const char *s, size_t n)
{
- register unsigned long r0 asm("0") = 0;
const char *p = s + n;
- asm volatile ("0: srst %0,%1\n"
- " jo 0b"
- : "+d" (p), "+a" (s) : "d" (r0) : "cc", "memory");
- return (char *) p;
+ asm volatile(
+ " lghi 0,0\n"
+ "0: srst %[p],%[s]\n"
+ " jo 0b\n"
+ : [p] "+&d" (p), [s] "+&a" (s)
+ :
+ : "cc", "memory", "0");
+ return (char *)p;
}
/**
@@ -76,45 +86,21 @@ EXPORT_SYMBOL(strnlen);
#ifdef __HAVE_ARCH_STRCPY
char *strcpy(char *dest, const char *src)
{
- register int r0 asm("0") = 0;
char *ret = dest;
- asm volatile ("0: mvst %0,%1\n"
- " jo 0b"
- : "+&a" (dest), "+&a" (src) : "d" (r0)
- : "cc", "memory" );
+ asm volatile(
+ " lghi 0,0\n"
+ "0: mvst %[dest],%[src]\n"
+ " jo 0b\n"
+ : [dest] "+&a" (dest), [src] "+&a" (src)
+ :
+ : "cc", "memory", "0");
return ret;
}
EXPORT_SYMBOL(strcpy);
#endif
/**
- * strlcpy - Copy a %NUL terminated string into a sized buffer
- * @dest: Where to copy the string to
- * @src: Where to copy the string from
- * @size: size of destination buffer
- *
- * Compatible with *BSD: the result is always a valid
- * NUL-terminated string that fits in the buffer (unless,
- * of course, the buffer size is zero). It does not pad
- * out the result like strncpy() does.
- */
-#ifdef __HAVE_ARCH_STRLCPY
-size_t strlcpy(char *dest, const char *src, size_t size)
-{
- size_t ret = __strend(src) - src;
-
- if (size) {
- size_t len = (ret >= size) ? size-1 : ret;
- dest[len] = '\0';
- memcpy(dest, src, len);
- }
- return ret;
-}
-EXPORT_SYMBOL(strlcpy);
-#endif
-
-/**
* strncpy - Copy a length-limited, %NUL-terminated string
* @dest: Where to copy the string to
* @src: Where to copy the string from
@@ -144,16 +130,18 @@ EXPORT_SYMBOL(strncpy);
#ifdef __HAVE_ARCH_STRCAT
char *strcat(char *dest, const char *src)
{
- register int r0 asm("0") = 0;
- unsigned long dummy;
+ unsigned long dummy = 0;
char *ret = dest;
- asm volatile ("0: srst %0,%1\n"
- " jo 0b\n"
- "1: mvst %0,%2\n"
- " jo 1b"
- : "=&a" (dummy), "+a" (dest), "+a" (src)
- : "d" (r0), "0" (0UL) : "cc", "memory" );
+ asm volatile(
+ " lghi 0,0\n"
+ "0: srst %[dummy],%[dest]\n"
+ " jo 0b\n"
+ "1: mvst %[dummy],%[src]\n"
+ " jo 1b\n"
+ : [dummy] "+&a" (dummy), [dest] "+&a" (dest), [src] "+&a" (src)
+ :
+ : "cc", "memory", "0");
return ret;
}
EXPORT_SYMBOL(strcat);
@@ -221,58 +209,40 @@ EXPORT_SYMBOL(strncat);
#ifdef __HAVE_ARCH_STRCMP
int strcmp(const char *s1, const char *s2)
{
- register int r0 asm("0") = 0;
int ret = 0;
- asm volatile ("0: clst %2,%3\n"
- " jo 0b\n"
- " je 1f\n"
- " ic %0,0(%2)\n"
- " ic %1,0(%3)\n"
- " sr %0,%1\n"
- "1:"
- : "+d" (ret), "+d" (r0), "+a" (s1), "+a" (s2)
- : : "cc", "memory");
+ asm volatile(
+ " lghi 0,0\n"
+ "0: clst %[s1],%[s2]\n"
+ " jo 0b\n"
+ " je 1f\n"
+ " ic %[ret],0(%[s1])\n"
+ " ic 0,0(%[s2])\n"
+ " sr %[ret],0\n"
+ "1:"
+ : [ret] "+&d" (ret), [s1] "+&a" (s1), [s2] "+&a" (s2)
+ :
+ : "cc", "memory", "0");
return ret;
}
EXPORT_SYMBOL(strcmp);
#endif
-/**
- * strrchr - Find the last occurrence of a character in a string
- * @s: The string to be searched
- * @c: The character to search for
- */
-#ifdef __HAVE_ARCH_STRRCHR
-char *strrchr(const char *s, int c)
-{
- size_t len = __strend(s) - s;
-
- if (len)
- do {
- if (s[len] == (char) c)
- return (char *) s + len;
- } while (--len > 0);
- return NULL;
-}
-EXPORT_SYMBOL(strrchr);
-#endif
-
static inline int clcle(const char *s1, unsigned long l1,
const char *s2, unsigned long l2)
{
- register unsigned long r2 asm("2") = (unsigned long) s1;
- register unsigned long r3 asm("3") = (unsigned long) l1;
- register unsigned long r4 asm("4") = (unsigned long) s2;
- register unsigned long r5 asm("5") = (unsigned long) l2;
+ union register_pair r1 = { .even = (unsigned long)s1, .odd = l1, };
+ union register_pair r3 = { .even = (unsigned long)s2, .odd = l2, };
int cc;
- asm volatile ("0: clcle %1,%3,0\n"
- " jo 0b\n"
- " ipm %0\n"
- " srl %0,28"
- : "=&d" (cc), "+a" (r2), "+a" (r3),
- "+a" (r4), "+a" (r5) : : "cc", "memory");
+ asm volatile(
+ "0: clcle %[r1],%[r3],0\n"
+ " jo 0b\n"
+ " ipm %[cc]\n"
+ " srl %[cc],28\n"
+ : [cc] "=&d" (cc), [r1] "+&d" (r1.pair), [r3] "+&d" (r3.pair)
+ :
+ : "cc", "memory");
return cc;
}
@@ -315,15 +285,18 @@ EXPORT_SYMBOL(strstr);
#ifdef __HAVE_ARCH_MEMCHR
void *memchr(const void *s, int c, size_t n)
{
- register int r0 asm("0") = (char) c;
const void *ret = s + n;
- asm volatile ("0: srst %0,%1\n"
- " jo 0b\n"
- " jl 1f\n"
- " la %0,0\n"
- "1:"
- : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
+ asm volatile(
+ " lgr 0,%[c]\n"
+ "0: srst %[ret],%[s]\n"
+ " jo 0b\n"
+ " jl 1f\n"
+ " la %[ret],0\n"
+ "1:"
+ : [ret] "+&a" (ret), [s] "+&a" (s)
+ : [c] "d" (c)
+ : "cc", "memory", "0");
return (void *) ret;
}
EXPORT_SYMBOL(memchr);
@@ -333,7 +306,7 @@ EXPORT_SYMBOL(memchr);
* memcmp - Compare two areas of memory
* @s1: One area of memory
* @s2: Another area of memory
- * @count: The size of the area.
+ * @n: The size of the area.
*/
#ifdef __HAVE_ARCH_MEMCMP
int memcmp(const void *s1, const void *s2, size_t n)
@@ -360,13 +333,16 @@ EXPORT_SYMBOL(memcmp);
#ifdef __HAVE_ARCH_MEMSCAN
void *memscan(void *s, int c, size_t n)
{
- register int r0 asm("0") = (char) c;
const void *ret = s + n;
- asm volatile ("0: srst %0,%1\n"
- " jo 0b\n"
- : "+a" (ret), "+&a" (s) : "d" (r0) : "cc", "memory");
- return (void *) ret;
+ asm volatile(
+ " lgr 0,%[c]\n"
+ "0: srst %[ret],%[s]\n"
+ " jo 0b\n"
+ : [ret] "+&a" (ret), [s] "+&a" (s)
+ : [c] "d" (c)
+ : "cc", "memory", "0");
+ return (void *)ret;
}
EXPORT_SYMBOL(memscan);
#endif
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.