projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 3363fbdd MS |
1 | #ifndef _ASM_S390_FUTEX_H |
| 2 | #define _ASM_S390_FUTEX_H | |
| 4732efbe | 3 | |
| 3363fbdd | 4 | #ifdef __KERNEL__ |
| 4732efbe | 5 | |
| 3363fbdd MS |
6 | #include <linux/futex.h> |
| 7 | #include <asm/errno.h> | |
| 8 | #include <asm/uaccess.h> | |
| 9 | ||
| 10 | #ifndef __s390x__ | |
| 11 | #define __futex_atomic_fixup \ | |
| 12 | ".section __ex_table,\"a\"\n" \ | |
| 13 | " .align 4\n" \ | |
| 14 | " .long 0b,2b,1b,2b\n" \ | |
| 15 | ".previous" | |
| 16 | #else /* __s390x__ */ | |
| 17 | #define __futex_atomic_fixup \ | |
| 18 | ".section __ex_table,\"a\"\n" \ | |
| 19 | " .align 8\n" \ | |
| 20 | " .quad 0b,2b,1b,2b\n" \ | |
| 21 | ".previous" | |
| 22 | #endif /* __s390x__ */ | |
| 23 | ||
| 24 | #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ | |
| 25 | asm volatile(" l %1,0(%6)\n" \ | |
| 26 | "0: " insn \ | |
| 27 | " cs %1,%2,0(%6)\n" \ | |
| 28 | "1: jl 0b\n" \ | |
| 29 | " lhi %0,0\n" \ | |
| 30 | "2:\n" \ | |
| 31 | __futex_atomic_fixup \ | |
| 32 | : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ | |
| 33 | "=m" (*uaddr) \ | |
| 34 | : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ | |
| 35 | "m" (*uaddr) : "cc" ); | |
| 36 | ||
| 37 | static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr) | |
| 38 | { | |
| 39 | int op = (encoded_op >> 28) & 7; | |
| 40 | int cmp = (encoded_op >> 24) & 15; | |
| 41 | int oparg = (encoded_op << 8) >> 20; | |
| 42 | int cmparg = (encoded_op << 20) >> 20; | |
| 43 | int oldval = 0, newval, ret; | |
| 44 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | |
| 45 | oparg = 1 << oparg; | |
| 46 | ||
| 47 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) | |
| 48 | return -EFAULT; | |
| 49 | ||
| 50 | inc_preempt_count(); | |
| 51 | ||
| 52 | switch (op) { | |
| 53 | case FUTEX_OP_SET: | |
| 54 | __futex_atomic_op("lr %2,%5\n", | |
| 55 | ret, oldval, newval, uaddr, oparg); | |
| 56 | break; | |
| 57 | case FUTEX_OP_ADD: | |
| 58 | __futex_atomic_op("lr %2,%1\nar %2,%5\n", | |
| 59 | ret, oldval, newval, uaddr, oparg); | |
| 60 | break; | |
| 61 | case FUTEX_OP_OR: | |
| 62 | __futex_atomic_op("lr %2,%1\nor %2,%5\n", | |
| 63 | ret, oldval, newval, uaddr, oparg); | |
| 64 | break; | |
| 65 | case FUTEX_OP_ANDN: | |
| 66 | __futex_atomic_op("lr %2,%1\nnr %2,%5\n", | |
| 67 | ret, oldval, newval, uaddr, oparg); | |
| 68 | break; | |
| 69 | case FUTEX_OP_XOR: | |
| 70 | __futex_atomic_op("lr %2,%1\nxr %2,%5\n", | |
| 71 | ret, oldval, newval, uaddr, oparg); | |
| 72 | break; | |
| 73 | default: | |
| 74 | ret = -ENOSYS; | |
| 75 | } | |
| 76 | ||
| 77 | dec_preempt_count(); | |
| 78 | ||
| 79 | if (!ret) { | |
| 80 | switch (cmp) { | |
| 81 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | |
| 82 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | |
| 83 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | |
| 84 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | |
| 85 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | |
| 86 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | |
| 87 | default: ret = -ENOSYS; | |
| 88 | } | |
| 89 | } | |
| 90 | return ret; | |
| 91 | } | |
| 92 | ||
| 93 | static inline int | |
| 94 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) | |
| 95 | { | |
| 96 | int ret; | |
| 97 | ||
| 98 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) | |
| 99 | return -EFAULT; | |
| 100 | asm volatile(" cs %1,%4,0(%5)\n" | |
| 101 | "0: lr %0,%1\n" | |
| 102 | "1:\n" | |
| 103 | #ifndef __s390x__ | |
| 104 | ".section __ex_table,\"a\"\n" | |
| 105 | " .align 4\n" | |
| 106 | " .long 0b,1b\n" | |
| 107 | ".previous" | |
| 108 | #else /* __s390x__ */ | |
| 109 | ".section __ex_table,\"a\"\n" | |
| 110 | " .align 8\n" | |
| 111 | " .quad 0b,1b\n" | |
| 112 | ".previous" | |
| 113 | #endif /* __s390x__ */ | |
| 114 | : "=d" (ret), "+d" (oldval), "=m" (*uaddr) | |
| 115 | : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) | |
| 116 | : "cc", "memory" ); | |
| 117 | return oldval; | |
| 118 | } | |
| 119 | ||
| 120 | #endif /* __KERNEL__ */ | |
| 121 | #endif /* _ASM_S390_FUTEX_H */ |