Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 1 | #ifndef _ASM_S390_FUTEX_H |
| 2 | #define _ASM_S390_FUTEX_H |
Jakub Jelinek | 4732efb | 2005-09-06 15:16:25 -0700 | [diff] [blame] | 3 | |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 4 | #ifdef __KERNEL__ |
Jakub Jelinek | 4732efb | 2005-09-06 15:16:25 -0700 | [diff] [blame] | 5 | |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 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" \ |
Martin Schwidefsky | bafe00c | 2006-06-08 01:36:20 -0700 | [diff] [blame] | 14 | " .long 0b,4b,2b,4b,3b,4b\n" \ |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 15 | ".previous" |
| 16 | #else /* __s390x__ */ |
| 17 | #define __futex_atomic_fixup \ |
| 18 | ".section __ex_table,\"a\"\n" \ |
| 19 | " .align 8\n" \ |
Martin Schwidefsky | bafe00c | 2006-06-08 01:36:20 -0700 | [diff] [blame] | 20 | " .quad 0b,4b,2b,4b,3b,4b\n" \ |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 21 | ".previous" |
| 22 | #endif /* __s390x__ */ |
| 23 | |
| 24 | #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ |
Martin Schwidefsky | bafe00c | 2006-06-08 01:36:20 -0700 | [diff] [blame] | 25 | asm volatile(" sacf 256\n" \ |
| 26 | "0: l %1,0(%6)\n" \ |
| 27 | "1: " insn \ |
| 28 | "2: cs %1,%2,0(%6)\n" \ |
| 29 | "3: jl 1b\n" \ |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 30 | " lhi %0,0\n" \ |
Martin Schwidefsky | bafe00c | 2006-06-08 01:36:20 -0700 | [diff] [blame] | 31 | "4: sacf 0\n" \ |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 32 | __futex_atomic_fixup \ |
| 33 | : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ |
| 34 | "=m" (*uaddr) \ |
| 35 | : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ |
| 36 | "m" (*uaddr) : "cc" ); |
| 37 | |
| 38 | static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr) |
| 39 | { |
| 40 | int op = (encoded_op >> 28) & 7; |
| 41 | int cmp = (encoded_op >> 24) & 15; |
| 42 | int oparg = (encoded_op << 8) >> 20; |
| 43 | int cmparg = (encoded_op << 20) >> 20; |
| 44 | int oldval = 0, newval, ret; |
| 45 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) |
| 46 | oparg = 1 << oparg; |
| 47 | |
| 48 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) |
| 49 | return -EFAULT; |
| 50 | |
| 51 | inc_preempt_count(); |
| 52 | |
| 53 | switch (op) { |
| 54 | case FUTEX_OP_SET: |
| 55 | __futex_atomic_op("lr %2,%5\n", |
| 56 | ret, oldval, newval, uaddr, oparg); |
| 57 | break; |
| 58 | case FUTEX_OP_ADD: |
| 59 | __futex_atomic_op("lr %2,%1\nar %2,%5\n", |
| 60 | ret, oldval, newval, uaddr, oparg); |
| 61 | break; |
| 62 | case FUTEX_OP_OR: |
| 63 | __futex_atomic_op("lr %2,%1\nor %2,%5\n", |
| 64 | ret, oldval, newval, uaddr, oparg); |
| 65 | break; |
| 66 | case FUTEX_OP_ANDN: |
| 67 | __futex_atomic_op("lr %2,%1\nnr %2,%5\n", |
| 68 | ret, oldval, newval, uaddr, oparg); |
| 69 | break; |
| 70 | case FUTEX_OP_XOR: |
| 71 | __futex_atomic_op("lr %2,%1\nxr %2,%5\n", |
| 72 | ret, oldval, newval, uaddr, oparg); |
| 73 | break; |
| 74 | default: |
| 75 | ret = -ENOSYS; |
| 76 | } |
| 77 | |
| 78 | dec_preempt_count(); |
| 79 | |
| 80 | if (!ret) { |
| 81 | switch (cmp) { |
| 82 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; |
| 83 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; |
| 84 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; |
| 85 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; |
| 86 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; |
| 87 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; |
| 88 | default: ret = -ENOSYS; |
| 89 | } |
| 90 | } |
| 91 | return ret; |
| 92 | } |
| 93 | |
| 94 | static inline int |
| 95 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) |
| 96 | { |
| 97 | int ret; |
| 98 | |
| 99 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) |
| 100 | return -EFAULT; |
| 101 | asm volatile(" cs %1,%4,0(%5)\n" |
| 102 | "0: lr %0,%1\n" |
| 103 | "1:\n" |
| 104 | #ifndef __s390x__ |
| 105 | ".section __ex_table,\"a\"\n" |
| 106 | " .align 4\n" |
| 107 | " .long 0b,1b\n" |
| 108 | ".previous" |
| 109 | #else /* __s390x__ */ |
| 110 | ".section __ex_table,\"a\"\n" |
| 111 | " .align 8\n" |
| 112 | " .quad 0b,1b\n" |
| 113 | ".previous" |
| 114 | #endif /* __s390x__ */ |
| 115 | : "=d" (ret), "+d" (oldval), "=m" (*uaddr) |
| 116 | : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) |
| 117 | : "cc", "memory" ); |
| 118 | return oldval; |
| 119 | } |
| 120 | |
| 121 | #endif /* __KERNEL__ */ |
| 122 | #endif /* _ASM_S390_FUTEX_H */ |