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Diffstat (limited to 'arch/sh/include/asm/futex.h')
-rw-r--r--arch/sh/include/asm/futex.h97
1 files changed, 59 insertions, 38 deletions
diff --git a/arch/sh/include/asm/futex.h b/arch/sh/include/asm/futex.h
index 7be39a646fbd..d0078747d308 100644
--- a/arch/sh/include/asm/futex.h
+++ b/arch/sh/include/asm/futex.h
@@ -7,16 +7,34 @@
#include <linux/uaccess.h>
#include <asm/errno.h>
-/* XXX: UP variants, fix for SH-4A and SMP.. */
+#if !defined(CONFIG_SMP)
#include <asm/futex-irq.h>
+#elif defined(CONFIG_CPU_J2)
+#include <asm/futex-cas.h>
+#elif defined(CONFIG_CPU_SH4A)
+#include <asm/futex-llsc.h>
+#else
+#error SMP not supported on this configuration.
+#endif
+
+static inline int
+futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
+ u32 oldval, u32 newval)
+{
+ if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
+ return -EFAULT;
+
+ return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
+}
static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
{
int op = (encoded_op >> 28) & 7;
int cmp = (encoded_op >> 24) & 15;
- int oparg = (encoded_op << 8) >> 20;
- int cmparg = (encoded_op << 20) >> 20;
- int oldval = 0, ret;
+ u32 oparg = (encoded_op << 8) >> 20;
+ u32 cmparg = (encoded_op << 20) >> 20;
+ u32 oldval, newval, prev;
+ int ret;
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
@@ -26,26 +44,39 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
pagefault_disable();
- switch (op) {
- case FUTEX_OP_SET:
- ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval);
- break;
- case FUTEX_OP_ADD:
- ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval);
- break;
- case FUTEX_OP_OR:
- ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval);
- break;
- case FUTEX_OP_ANDN:
- ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval);
- break;
- case FUTEX_OP_XOR:
- ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval);
- break;
- default:
- ret = -ENOSYS;
- break;
- }
+ do {
+ if (op == FUTEX_OP_SET)
+ ret = oldval = 0;
+ else
+ ret = get_user(oldval, uaddr);
+
+ if (ret) break;
+
+ switch (op) {
+ case FUTEX_OP_SET:
+ newval = oparg;
+ break;
+ case FUTEX_OP_ADD:
+ newval = oldval + oparg;
+ break;
+ case FUTEX_OP_OR:
+ newval = oldval | oparg;
+ break;
+ case FUTEX_OP_ANDN:
+ newval = oldval & ~oparg;
+ break;
+ case FUTEX_OP_XOR:
+ newval = oldval ^ oparg;
+ break;
+ default:
+ ret = -ENOSYS;
+ break;
+ }
+
+ if (ret) break;
+
+ ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
+ } while (!ret && prev != oldval);
pagefault_enable();
@@ -53,10 +84,10 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
switch (cmp) {
case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
- case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
- case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
- case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
- case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
+ case FUTEX_OP_CMP_LT: ret = ((int)oldval < (int)cmparg); break;
+ case FUTEX_OP_CMP_GE: ret = ((int)oldval >= (int)cmparg); break;
+ case FUTEX_OP_CMP_LE: ret = ((int)oldval <= (int)cmparg); break;
+ case FUTEX_OP_CMP_GT: ret = ((int)oldval > (int)cmparg); break;
default: ret = -ENOSYS;
}
}
@@ -64,15 +95,5 @@ 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)
-{
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
- return -EFAULT;
-
- return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
-}
-
#endif /* __KERNEL__ */
#endif /* __ASM_SH_FUTEX_H */