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gerrit-public.fairphone.software / kernel / msm-4.19 / de1d9c033f32ce39bf60e25be3b8624225fa9181 / . / include / asm-powerpc / futex.h
blob: 39e85f320a76e74d010e8ce76bcec130b16245a7 [file] [log] [blame]
David Gibson2ff2ae72005-11-02 13:58:22 +1100[diff] [blame]1#ifndef _ASM_POWERPC_FUTEX_H
2#define _ASM_POWERPC_FUTEX_H
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]3
4#ifdef __KERNEL__
5
6#include <linux/futex.h>
7#include <asm/errno.h>
Becky Brucefeaf7cf2005-09-22 14:20:04 -0500[diff] [blame]8#include <asm/synch.h>
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]9#include <asm/uaccess.h>
David Gibson3ddfbcf2005-11-10 12:56:55 +1100[diff] [blame]10#include <asm/asm-compat.h>
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]11
12#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
David Gibson2ff2ae72005-11-02 13:58:22 +1100[diff] [blame]13 __asm__ __volatile ( \
Anton Blanchard144b9c12006-01-13 15:37:17 +1100[diff] [blame]14 LWSYNC_ON_SMP \
David Gibson2ff2ae72005-11-02 13:58:22 +1100[diff] [blame]15"1: lwarx %0,0,%2\n" \
16 insn \
David Gibson3ddfbcf2005-11-10 12:56:55 +1100[diff] [blame]17 PPC405_ERR77(0, %2) \
David Gibson2ff2ae72005-11-02 13:58:22 +1100[diff] [blame]18"2: stwcx. %1,0,%2\n" \
19 "bne- 1b\n" \
20 "li %1,0\n" \
21"3: .section .fixup,\"ax\"\n" \
22"4: li %1,%3\n" \
23 "b 3b\n" \
24 ".previous\n" \
25 ".section __ex_table,\"a\"\n" \
26 ".align 3\n" \
David Gibson3ddfbcf2005-11-10 12:56:55 +1100[diff] [blame]27 PPC_LONG "1b,4b,2b,4b\n" \
David Gibson2ff2ae72005-11-02 13:58:22 +1100[diff] [blame]28 ".previous" \
29 : "=&r" (oldval), "=&r" (ret) \
30 : "b" (uaddr), "i" (-EFAULT), "1" (oparg) \
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]31 : "cr0", "memory")
32
David Gibson2ff2ae72005-11-02 13:58:22 +1100[diff] [blame]33static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
Jakub Jelinek4732efb2005-09-06 15:16:25 -0700[diff] [blame]34{
35 int op = (encoded_op >> 28) & 7;
36 int cmp = (encoded_op >> 24) & 15;
37 int oparg = (encoded_op << 8) >> 20;
38 int cmparg = (encoded_op << 20) >> 20;
39 int oldval = 0, ret;
40 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
41 oparg = 1 << oparg;
42
43 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
44 return -EFAULT;
45
46 inc_preempt_count();
47
48 switch (op) {
49 case FUTEX_OP_SET:
50 __futex_atomic_op("", ret, oldval, uaddr, oparg);
51 break;
52 case FUTEX_OP_ADD:
53 __futex_atomic_op("add %1,%0,%1\n", ret, oldval, uaddr, oparg);
54 break;
55 case FUTEX_OP_OR:
56 __futex_atomic_op("or %1,%0,%1\n", ret, oldval, uaddr, oparg);
57 break;
58 case FUTEX_OP_ANDN:
59 __futex_atomic_op("andc %1,%0,%1\n", ret, oldval, uaddr, oparg);
60 break;
61 case FUTEX_OP_XOR:
62 __futex_atomic_op("xor %1,%0,%1\n", ret, oldval, uaddr, oparg);
63 break;
64 default:
65 ret = -ENOSYS;
66 }
67
68 dec_preempt_count();
69
70 if (!ret) {
71 switch (cmp) {
72 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
73 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
74 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
75 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
76 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
77 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
78 default: ret = -ENOSYS;
79 }
80 }
81 return ret;
82}
83
David Gibson2ff2ae72005-11-02 13:58:22 +1100[diff] [blame]84#endif /* __KERNEL__ */
85#endif /* _ASM_POWERPC_FUTEX_H */