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79 lines
1.9 KiB
79 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_S390_FUTEX_H |
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#define _ASM_S390_FUTEX_H |
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#include <linux/uaccess.h> |
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#include <linux/futex.h> |
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#include <asm/mmu_context.h> |
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#include <asm/errno.h> |
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#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ |
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asm volatile( \ |
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" sacf 256\n" \ |
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"0: l %1,0(%6)\n" \ |
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"1:"insn \ |
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"2: cs %1,%2,0(%6)\n" \ |
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"3: jl 1b\n" \ |
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" lhi %0,0\n" \ |
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"4: sacf 768\n" \ |
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EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \ |
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: "=d" (ret), "=&d" (oldval), "=&d" (newval), \ |
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"=m" (*uaddr) \ |
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: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ |
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"m" (*uaddr) : "cc"); |
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static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, |
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u32 __user *uaddr) |
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{ |
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int oldval = 0, newval, ret; |
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switch (op) { |
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case FUTEX_OP_SET: |
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__futex_atomic_op("lr %2,%5\n", |
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ret, oldval, newval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ADD: |
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__futex_atomic_op("lr %2,%1\nar %2,%5\n", |
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ret, oldval, newval, uaddr, oparg); |
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break; |
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case FUTEX_OP_OR: |
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__futex_atomic_op("lr %2,%1\nor %2,%5\n", |
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ret, oldval, newval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ANDN: |
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__futex_atomic_op("lr %2,%1\nnr %2,%5\n", |
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ret, oldval, newval, uaddr, oparg); |
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break; |
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case FUTEX_OP_XOR: |
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__futex_atomic_op("lr %2,%1\nxr %2,%5\n", |
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ret, oldval, newval, uaddr, oparg); |
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break; |
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default: |
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ret = -ENOSYS; |
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} |
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if (!ret) |
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*oval = oldval; |
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return ret; |
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} |
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static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, |
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u32 oldval, u32 newval) |
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{ |
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int ret; |
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asm volatile( |
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" sacf 256\n" |
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"0: cs %1,%4,0(%5)\n" |
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"1: la %0,0\n" |
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"2: sacf 768\n" |
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EX_TABLE(0b,2b) EX_TABLE(1b,2b) |
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: "=d" (ret), "+d" (oldval), "=m" (*uaddr) |
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: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) |
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: "cc", "memory"); |
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*uval = oldval; |
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return ret; |
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} |
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#endif /* _ASM_S390_FUTEX_H */
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