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 | |
Heiko Carstens | d8ad075 | 2007-01-09 10:18:50 +0100 | [diff] [blame] | 4 | #include <linux/uaccess.h> |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 5 | #include <linux/futex.h> |
| 6 | #include <asm/mmu_context.h> |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 7 | #include <asm/errno.h> |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 8 | |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 9 | #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ |
| 10 | asm volatile( \ |
| 11 | " sacf 256\n" \ |
| 12 | "0: l %1,0(%6)\n" \ |
| 13 | "1:"insn \ |
| 14 | "2: cs %1,%2,0(%6)\n" \ |
| 15 | "3: jl 1b\n" \ |
| 16 | " lhi %0,0\n" \ |
| 17 | "4: sacf 768\n" \ |
| 18 | EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \ |
| 19 | : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ |
| 20 | "=m" (*uaddr) \ |
| 21 | : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ |
| 22 | "m" (*uaddr) : "cc"); |
Heiko Carstens | 4f41c2b | 2014-01-23 11:18:36 +0100 | [diff] [blame] | 23 | |
Jiri Slaby | 30d6e0a | 2017-08-24 09:31:05 +0200 | [diff] [blame^] | 24 | static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, |
| 25 | u32 __user *uaddr) |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 26 | { |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 27 | int oldval = 0, newval, ret; |
Gerald Schaefer | d02765d | 2006-09-20 15:59:42 +0200 | [diff] [blame] | 28 | |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 29 | load_kernel_asce(); |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 30 | |
Heiko Carstens | d8ad075 | 2007-01-09 10:18:50 +0100 | [diff] [blame] | 31 | pagefault_disable(); |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 32 | switch (op) { |
| 33 | case FUTEX_OP_SET: |
| 34 | __futex_atomic_op("lr %2,%5\n", |
| 35 | ret, oldval, newval, uaddr, oparg); |
| 36 | break; |
| 37 | case FUTEX_OP_ADD: |
| 38 | __futex_atomic_op("lr %2,%1\nar %2,%5\n", |
| 39 | ret, oldval, newval, uaddr, oparg); |
| 40 | break; |
| 41 | case FUTEX_OP_OR: |
| 42 | __futex_atomic_op("lr %2,%1\nor %2,%5\n", |
| 43 | ret, oldval, newval, uaddr, oparg); |
| 44 | break; |
| 45 | case FUTEX_OP_ANDN: |
| 46 | __futex_atomic_op("lr %2,%1\nnr %2,%5\n", |
| 47 | ret, oldval, newval, uaddr, oparg); |
| 48 | break; |
| 49 | case FUTEX_OP_XOR: |
| 50 | __futex_atomic_op("lr %2,%1\nxr %2,%5\n", |
| 51 | ret, oldval, newval, uaddr, oparg); |
| 52 | break; |
| 53 | default: |
| 54 | ret = -ENOSYS; |
| 55 | } |
Heiko Carstens | d8ad075 | 2007-01-09 10:18:50 +0100 | [diff] [blame] | 56 | pagefault_enable(); |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 57 | |
Jiri Slaby | 30d6e0a | 2017-08-24 09:31:05 +0200 | [diff] [blame^] | 58 | if (!ret) |
| 59 | *oval = oldval; |
| 60 | |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 61 | return ret; |
| 62 | } |
| 63 | |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 64 | static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
| 65 | u32 oldval, u32 newval) |
| 66 | { |
| 67 | int ret; |
| 68 | |
Martin Schwidefsky | beef560 | 2014-04-14 15:11:26 +0200 | [diff] [blame] | 69 | load_kernel_asce(); |
Heiko Carstens | 457f218 | 2014-03-21 10:42:25 +0100 | [diff] [blame] | 70 | asm volatile( |
| 71 | " sacf 256\n" |
| 72 | "0: cs %1,%4,0(%5)\n" |
| 73 | "1: la %0,0\n" |
| 74 | "2: sacf 768\n" |
| 75 | EX_TABLE(0b,2b) EX_TABLE(1b,2b) |
| 76 | : "=d" (ret), "+d" (oldval), "=m" (*uaddr) |
| 77 | : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) |
| 78 | : "cc", "memory"); |
| 79 | *uval = oldval; |
| 80 | return ret; |
| 81 | } |
| 82 | |
Martin Schwidefsky | 3363fbd | 2006-04-27 18:40:12 -0700 | [diff] [blame] | 83 | #endif /* _ASM_S390_FUTEX_H */ |