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-rw-r--r--include/asm-powerpc/futex.h84
-rw-r--r--include/asm-powerpc/ppc_asm.h7
2 files changed, 91 insertions, 0 deletions
diff --git a/include/asm-powerpc/futex.h b/include/asm-powerpc/futex.h
new file mode 100644
index 000000000000..37c94e52ab6d
--- /dev/null
+++ b/include/asm-powerpc/futex.h
@@ -0,0 +1,84 @@
1#ifndef _ASM_POWERPC_FUTEX_H
2#define _ASM_POWERPC_FUTEX_H
3
4#ifdef __KERNEL__
5
6#include <linux/futex.h>
7#include <asm/errno.h>
8#include <asm/synch.h>
9#include <asm/uaccess.h>
10#include <asm/ppc_asm.h>
11
12#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
13 __asm__ __volatile ( \
14 SYNC_ON_SMP \
15"1: lwarx %0,0,%2\n" \
16 insn \
17"2: stwcx. %1,0,%2\n" \
18 "bne- 1b\n" \
19 "li %1,0\n" \
20"3: .section .fixup,\"ax\"\n" \
21"4: li %1,%3\n" \
22 "b 3b\n" \
23 ".previous\n" \
24 ".section __ex_table,\"a\"\n" \
25 ".align 3\n" \
26 DATAL " 1b,4b,2b,4b\n" \
27 ".previous" \
28 : "=&r" (oldval), "=&r" (ret) \
29 : "b" (uaddr), "i" (-EFAULT), "1" (oparg) \
30 : "cr0", "memory")
31
32static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
33{
34 int op = (encoded_op >> 28) & 7;
35 int cmp = (encoded_op >> 24) & 15;
36 int oparg = (encoded_op << 8) >> 20;
37 int cmparg = (encoded_op << 20) >> 20;
38 int oldval = 0, ret;
39 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
40 oparg = 1 << oparg;
41
42 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
43 return -EFAULT;
44
45 inc_preempt_count();
46
47 switch (op) {
48 case FUTEX_OP_SET:
49 __futex_atomic_op("", ret, oldval, uaddr, oparg);
50 break;
51 case FUTEX_OP_ADD:
52 __futex_atomic_op("add %1,%0,%1\n", ret, oldval, uaddr, oparg);
53 break;
54 case FUTEX_OP_OR:
55 __futex_atomic_op("or %1,%0,%1\n", ret, oldval, uaddr, oparg);
56 break;
57 case FUTEX_OP_ANDN:
58 __futex_atomic_op("andc %1,%0,%1\n", ret, oldval, uaddr, oparg);
59 break;
60 case FUTEX_OP_XOR:
61 __futex_atomic_op("xor %1,%0,%1\n", ret, oldval, uaddr, oparg);
62 break;
63 default:
64 ret = -ENOSYS;
65 }
66
67 dec_preempt_count();
68
69 if (!ret) {
70 switch (cmp) {
71 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
72 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
73 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
74 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
75 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
76 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
77 default: ret = -ENOSYS;
78 }
79 }
80 return ret;
81}
82
83#endif /* __KERNEL__ */
84#endif /* _ASM_POWERPC_FUTEX_H */
diff --git a/include/asm-powerpc/ppc_asm.h b/include/asm-powerpc/ppc_asm.h
index f99f2af82ca5..c534ca41224b 100644
--- a/include/asm-powerpc/ppc_asm.h
+++ b/include/asm-powerpc/ppc_asm.h
@@ -506,6 +506,13 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
506#else 506#else
507 #define __ASM_CONST(x) x##UL 507 #define __ASM_CONST(x) x##UL
508 #define ASM_CONST(x) __ASM_CONST(x) 508 #define ASM_CONST(x) __ASM_CONST(x)
509
510#ifdef CONFIG_PPC64
511#define DATAL ".llong"
512#else
513#define DATAL ".long"
514#endif
515
509#endif /* __ASSEMBLY__ */ 516#endif /* __ASSEMBLY__ */
510 517
511#endif /* _ASM_POWERPC_PPC_ASM_H */ 518#endif /* _ASM_POWERPC_PPC_ASM_H */