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121 lines
2.5 KiB
121 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_CSKY_FUTEX_H |
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#define __ASM_CSKY_FUTEX_H |
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#ifndef CONFIG_SMP |
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#include <asm-generic/futex.h> |
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#else |
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#include <linux/atomic.h> |
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#include <linux/futex.h> |
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#include <linux/uaccess.h> |
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#include <linux/errno.h> |
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#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ |
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{ \ |
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u32 tmp; \ |
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\ |
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__atomic_pre_full_fence(); \ |
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\ |
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__asm__ __volatile__ ( \ |
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"1: ldex.w %[ov], %[u] \n" \ |
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" "insn" \n" \ |
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"2: stex.w %[t], %[u] \n" \ |
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" bez %[t], 1b \n" \ |
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" br 4f \n" \ |
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"3: mov %[r], %[e] \n" \ |
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"4: \n" \ |
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" .section __ex_table,\"a\" \n" \ |
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" .balign 4 \n" \ |
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" .long 1b, 3b \n" \ |
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" .long 2b, 3b \n" \ |
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" .previous \n" \ |
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: [r] "+r" (ret), [ov] "=&r" (oldval), \ |
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[u] "+m" (*uaddr), [t] "=&r" (tmp) \ |
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: [op] "Jr" (oparg), [e] "jr" (-EFAULT) \ |
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: "memory"); \ |
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\ |
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__atomic_post_full_fence(); \ |
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} |
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static inline int |
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arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) |
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{ |
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int oldval = 0, ret = 0; |
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if (!access_ok(uaddr, sizeof(u32))) |
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return -EFAULT; |
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switch (op) { |
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case FUTEX_OP_SET: |
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__futex_atomic_op("mov %[t], %[ov]", |
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ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ADD: |
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__futex_atomic_op("add %[t], %[ov], %[op]", |
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ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_OR: |
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__futex_atomic_op("or %[t], %[ov], %[op]", |
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ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ANDN: |
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__futex_atomic_op("and %[t], %[ov], %[op]", |
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ret, oldval, uaddr, ~oparg); |
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break; |
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case FUTEX_OP_XOR: |
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__futex_atomic_op("xor %[t], %[ov], %[op]", |
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ret, oldval, 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 |
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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 = 0; |
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u32 val, tmp; |
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if (!access_ok(uaddr, sizeof(u32))) |
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return -EFAULT; |
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__atomic_pre_full_fence(); |
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__asm__ __volatile__ ( |
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"1: ldex.w %[v], %[u] \n" |
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" cmpne %[v], %[ov] \n" |
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" bt 4f \n" |
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" mov %[t], %[nv] \n" |
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"2: stex.w %[t], %[u] \n" |
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" bez %[t], 1b \n" |
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" br 4f \n" |
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"3: mov %[r], %[e] \n" |
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"4: \n" |
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" .section __ex_table,\"a\" \n" |
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" .balign 4 \n" |
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" .long 1b, 3b \n" |
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" .long 2b, 3b \n" |
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" .previous \n" |
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: [r] "+r" (ret), [v] "=&r" (val), [u] "+m" (*uaddr), |
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[t] "=&r" (tmp) |
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: [ov] "Jr" (oldval), [nv] "Jr" (newval), [e] "Jr" (-EFAULT) |
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: "memory"); |
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__atomic_post_full_fence(); |
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*uval = val; |
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return ret; |
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} |
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#endif /* CONFIG_SMP */ |
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#endif /* __ASM_CSKY_FUTEX_H */
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