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Diffstat (limited to 'arch/s390/include/asm/futex.h')
-rw-r--r--arch/s390/include/asm/futex.h66
1 files changed, 61 insertions, 5 deletions
diff --git a/arch/s390/include/asm/futex.h b/arch/s390/include/asm/futex.h
index fda46bd38c99..69cf5b5eddc9 100644
--- a/arch/s390/include/asm/futex.h
+++ b/arch/s390/include/asm/futex.h
@@ -1,12 +1,25 @@
#ifndef _ASM_S390_FUTEX_H
#define _ASM_S390_FUTEX_H
-#include <linux/futex.h>
#include <linux/uaccess.h>
+#include <linux/futex.h>
+#include <asm/mmu_context.h>
#include <asm/errno.h>
-int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval);
-int __futex_atomic_op_inuser(int op, u32 __user *uaddr, int oparg, int *old);
+#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
+ asm volatile( \
+ " sacf 256\n" \
+ "0: l %1,0(%6)\n" \
+ "1:"insn \
+ "2: cs %1,%2,0(%6)\n" \
+ "3: jl 1b\n" \
+ " lhi %0,0\n" \
+ "4: sacf 768\n" \
+ EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \
+ : "=d" (ret), "=&d" (oldval), "=&d" (newval), \
+ "=m" (*uaddr) \
+ : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
+ "m" (*uaddr) : "cc");
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
{
@@ -14,13 +27,37 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
int cmp = (encoded_op >> 24) & 15;
int oparg = (encoded_op << 8) >> 20;
int cmparg = (encoded_op << 20) >> 20;
- int oldval, ret;
+ int oldval = 0, newval, ret;
+ update_primary_asce(current);
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
pagefault_disable();
- ret = __futex_atomic_op_inuser(op, uaddr, oparg, &oldval);
+ switch (op) {
+ case FUTEX_OP_SET:
+ __futex_atomic_op("lr %2,%5\n",
+ ret, oldval, newval, uaddr, oparg);
+ break;
+ case FUTEX_OP_ADD:
+ __futex_atomic_op("lr %2,%1\nar %2,%5\n",
+ ret, oldval, newval, uaddr, oparg);
+ break;
+ case FUTEX_OP_OR:
+ __futex_atomic_op("lr %2,%1\nor %2,%5\n",
+ ret, oldval, newval, uaddr, oparg);
+ break;
+ case FUTEX_OP_ANDN:
+ __futex_atomic_op("lr %2,%1\nnr %2,%5\n",
+ ret, oldval, newval, uaddr, oparg);
+ break;
+ case FUTEX_OP_XOR:
+ __futex_atomic_op("lr %2,%1\nxr %2,%5\n",
+ ret, oldval, newval, uaddr, oparg);
+ break;
+ default:
+ ret = -ENOSYS;
+ }
pagefault_enable();
if (!ret) {
@@ -37,4 +74,23 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
return ret;
}
+static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+ u32 oldval, u32 newval)
+{
+ int ret;
+
+ update_primary_asce(current);
+ asm volatile(
+ " sacf 256\n"
+ "0: cs %1,%4,0(%5)\n"
+ "1: la %0,0\n"
+ "2: sacf 768\n"
+ EX_TABLE(0b,2b) EX_TABLE(1b,2b)
+ : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
+ : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
+ : "cc", "memory");
+ *uval = oldval;
+ return ret;
+}
+
#endif /* _ASM_S390_FUTEX_H */