6 #include <linux/futex.h>
8 #include <asm/system.h>
9 #include <asm/processor.h>
10 #include <asm/uaccess.h>
12 #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
13 __asm__ __volatile ( \
15 "2: .section .fixup,\"ax\"\n\
19 .section __ex_table,\"a\"\n\
23 : "=r" (oldval), "=r" (ret), "=m" (*uaddr) \
24 : "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0))
26 #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
27 __asm__ __volatile ( \
31 "2: " LOCK_PREFIX "cmpxchgl %3, %2\n\
33 3: .section .fixup,\"ax\"\n\
37 .section __ex_table,\"a\"\n\
41 : "=&a" (oldval), "=&r" (ret), "=m" (*uaddr), \
43 : "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0))
46 futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
48 int op = (encoded_op >> 28) & 7;
49 int cmp = (encoded_op >> 24) & 15;
50 int oparg = (encoded_op << 8) >> 20;
51 int cmparg = (encoded_op << 20) >> 20;
52 int oldval = 0, ret, tem;
53 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
56 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
61 if (op == FUTEX_OP_SET)
62 __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
64 #if !defined(CONFIG_X86_BSWAP) && !defined(CONFIG_UML)
65 if (boot_cpu_data.x86 == 3)
71 __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret,
72 oldval, uaddr, oparg);
75 __futex_atomic_op2("orl %4, %3", ret, oldval, uaddr,
79 __futex_atomic_op2("andl %4, %3", ret, oldval, uaddr,
83 __futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr,
95 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
96 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
97 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
98 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
99 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
100 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
101 default: ret = -ENOSYS;