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Diffstat (limited to 'arch/s390/include/asm/cmpxchg.h')
-rw-r--r--arch/s390/include/asm/cmpxchg.h120
1 files changed, 100 insertions, 20 deletions
diff --git a/arch/s390/include/asm/cmpxchg.h b/arch/s390/include/asm/cmpxchg.h
index 81d7908416c..4236408070e 100644
--- a/arch/s390/include/asm/cmpxchg.h
+++ b/arch/s390/include/asm/cmpxchg.h
@@ -7,7 +7,9 @@
#ifndef __ASM_CMPXCHG_H
#define __ASM_CMPXCHG_H
+#include <linux/mmdebug.h>
#include <linux/types.h>
+#include <linux/bug.h>
extern void __xchg_called_with_bad_pointer(void);
@@ -29,7 +31,7 @@ static inline unsigned long __xchg(unsigned long x, void *ptr, int size)
" cs %0,0,%4\n"
" jl 0b\n"
: "=&d" (old), "=Q" (*(int *) addr)
- : "d" (x << shift), "d" (~(255 << shift)),
+ : "d" ((x & 0xff) << shift), "d" (~(0xff << shift)),
"Q" (*(int *) addr) : "memory", "cc", "0");
return old >> shift;
case 2:
@@ -44,7 +46,7 @@ static inline unsigned long __xchg(unsigned long x, void *ptr, int size)
" cs %0,0,%4\n"
" jl 0b\n"
: "=&d" (old), "=Q" (*(int *) addr)
- : "d" (x << shift), "d" (~(65535 << shift)),
+ : "d" ((x & 0xffff) << shift), "d" (~(0xffff << shift)),
"Q" (*(int *) addr) : "memory", "cc", "0");
return old >> shift;
case 4:
@@ -113,9 +115,10 @@ static inline unsigned long __cmpxchg(void *ptr, unsigned long old,
" nr %1,%5\n"
" jnz 0b\n"
"1:"
- : "=&d" (prev), "=&d" (tmp), "=Q" (*(int *) ptr)
- : "d" (old << shift), "d" (new << shift),
- "d" (~(255 << shift)), "Q" (*(int *) ptr)
+ : "=&d" (prev), "=&d" (tmp), "+Q" (*(int *) addr)
+ : "d" ((old & 0xff) << shift),
+ "d" ((new & 0xff) << shift),
+ "d" (~(0xff << shift))
: "memory", "cc");
return prev >> shift;
case 2:
@@ -134,9 +137,10 @@ static inline unsigned long __cmpxchg(void *ptr, unsigned long old,
" nr %1,%5\n"
" jnz 0b\n"
"1:"
- : "=&d" (prev), "=&d" (tmp), "=Q" (*(int *) ptr)
- : "d" (old << shift), "d" (new << shift),
- "d" (~(65535 << shift)), "Q" (*(int *) ptr)
+ : "=&d" (prev), "=&d" (tmp), "+Q" (*(int *) addr)
+ : "d" ((old & 0xffff) << shift),
+ "d" ((new & 0xffff) << shift),
+ "d" (~(0xffff << shift))
: "memory", "cc");
return prev >> shift;
case 4:
@@ -160,9 +164,14 @@ static inline unsigned long __cmpxchg(void *ptr, unsigned long old,
return old;
}
-#define cmpxchg(ptr, o, n) \
- ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
- (unsigned long)(n), sizeof(*(ptr))))
+#define cmpxchg(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) __ret; \
+ __ret = (__typeof__(*(ptr))) \
+ __cmpxchg((ptr), (unsigned long)(o), (unsigned long)(n), \
+ sizeof(*(ptr))); \
+ __ret; \
+})
#ifdef CONFIG_64BIT
#define cmpxchg64(ptr, o, n) \
@@ -176,20 +185,86 @@ static inline unsigned long long __cmpxchg64(void *ptr,
{
register_pair rp_old = {.pair = old};
register_pair rp_new = {.pair = new};
+ unsigned long long *ullptr = ptr;
asm volatile(
" cds %0,%2,%1"
- : "+&d" (rp_old), "=Q" (ptr)
- : "d" (rp_new), "Q" (ptr)
- : "cc");
+ : "+d" (rp_old), "+Q" (*ullptr)
+ : "d" (rp_new)
+ : "memory", "cc");
return rp_old.pair;
}
-#define cmpxchg64(ptr, o, n) \
- ((__typeof__(*(ptr)))__cmpxchg64((ptr), \
- (unsigned long long)(o), \
- (unsigned long long)(n)))
+
+#define cmpxchg64(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) __ret; \
+ __ret = (__typeof__(*(ptr))) \
+ __cmpxchg64((ptr), \
+ (unsigned long long)(o), \
+ (unsigned long long)(n)); \
+ __ret; \
+})
#endif /* CONFIG_64BIT */
+#define __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, insn) \
+({ \
+ register __typeof__(*(p1)) __old1 asm("2") = (o1); \
+ register __typeof__(*(p2)) __old2 asm("3") = (o2); \
+ register __typeof__(*(p1)) __new1 asm("4") = (n1); \
+ register __typeof__(*(p2)) __new2 asm("5") = (n2); \
+ int cc; \
+ asm volatile( \
+ insn " %[old],%[new],%[ptr]\n" \
+ " ipm %[cc]\n" \
+ " srl %[cc],28" \
+ : [cc] "=d" (cc), [old] "+d" (__old1), "+d" (__old2) \
+ : [new] "d" (__new1), "d" (__new2), \
+ [ptr] "Q" (*(p1)), "Q" (*(p2)) \
+ : "memory", "cc"); \
+ !cc; \
+})
+
+#define __cmpxchg_double_4(p1, p2, o1, o2, n1, n2) \
+ __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cds")
+
+#define __cmpxchg_double_8(p1, p2, o1, o2, n1, n2) \
+ __cmpxchg_double_op(p1, p2, o1, o2, n1, n2, "cdsg")
+
+extern void __cmpxchg_double_called_with_bad_pointer(void);
+
+#define __cmpxchg_double(p1, p2, o1, o2, n1, n2) \
+({ \
+ int __ret; \
+ switch (sizeof(*(p1))) { \
+ case 4: \
+ __ret = __cmpxchg_double_4(p1, p2, o1, o2, n1, n2); \
+ break; \
+ case 8: \
+ __ret = __cmpxchg_double_8(p1, p2, o1, o2, n1, n2); \
+ break; \
+ default: \
+ __cmpxchg_double_called_with_bad_pointer(); \
+ } \
+ __ret; \
+})
+
+#define cmpxchg_double(p1, p2, o1, o2, n1, n2) \
+({ \
+ __typeof__(p1) __p1 = (p1); \
+ __typeof__(p2) __p2 = (p2); \
+ int __ret; \
+ BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \
+ BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \
+ VM_BUG_ON((unsigned long)((__p1) + 1) != (unsigned long)(__p2));\
+ if (sizeof(long) == 4) \
+ __ret = __cmpxchg_double_4(__p1, __p2, o1, o2, n1, n2); \
+ else \
+ __ret = __cmpxchg_double_8(__p1, __p2, o1, o2, n1, n2); \
+ __ret; \
+})
+
+#define system_has_cmpxchg_double() 1
+
#include <asm-generic/cmpxchg-local.h>
static inline unsigned long __cmpxchg_local(void *ptr,
@@ -216,8 +291,13 @@ static inline unsigned long __cmpxchg_local(void *ptr,
* them available.
*/
#define cmpxchg_local(ptr, o, n) \
- ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
- (unsigned long)(n), sizeof(*(ptr))))
+({ \
+ __typeof__(*(ptr)) __ret; \
+ __ret = (__typeof__(*(ptr))) \
+ __cmpxchg_local((ptr), (unsigned long)(o), \
+ (unsigned long)(n), sizeof(*(ptr))); \
+ __ret; \
+})
#define cmpxchg64_local(ptr, o, n) cmpxchg64((ptr), (o), (n))
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 01:34:30 +0000