122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
/* 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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