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99 lines
2.1 KiB
99 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_MICROBLAZE_FUTEX_H |
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#define _ASM_MICROBLAZE_FUTEX_H |
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#ifdef __KERNEL__ |
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#include <linux/futex.h> |
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#include <linux/uaccess.h> |
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#include <asm/errno.h> |
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#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ |
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({ \ |
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__asm__ __volatile__ ( \ |
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"1: lwx %0, %2, r0; " \ |
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insn \ |
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"2: swx %1, %2, r0; \ |
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addic %1, r0, 0; \ |
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bnei %1, 1b; \ |
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3: \ |
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.section .fixup,\"ax\"; \ |
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4: brid 3b; \ |
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addik %1, r0, %3; \ |
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.previous; \ |
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.section __ex_table,\"a\"; \ |
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.word 1b,4b,2b,4b; \ |
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.previous;" \ |
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: "=&r" (oldval), "=&r" (ret) \ |
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: "r" (uaddr), "i" (-EFAULT), "r" (oparg) \ |
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); \ |
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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; |
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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("or %1,%4,%4;", 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 %1,%0,%4;", 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 %1,%0,%4;", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ANDN: |
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__futex_atomic_op("andn %1,%0,%4;", 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 %1,%0,%4;", 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, cmp; |
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u32 prev; |
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if (!access_ok(uaddr, sizeof(u32))) |
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return -EFAULT; |
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__asm__ __volatile__ ("1: lwx %1, %3, r0; \ |
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cmp %2, %1, %4; \ |
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bnei %2, 3f; \ |
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2: swx %5, %3, r0; \ |
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addic %2, r0, 0; \ |
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bnei %2, 1b; \ |
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3: \ |
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.section .fixup,\"ax\"; \ |
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4: brid 3b; \ |
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addik %0, r0, %6; \ |
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.previous; \ |
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.section __ex_table,\"a\"; \ |
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.word 1b,4b,2b,4b; \ |
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.previous;" \ |
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: "+r" (ret), "=&r" (prev), "=&r"(cmp) \ |
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: "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)); |
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*uval = prev; |
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return ret; |
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} |
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#endif /* __KERNEL__ */ |
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#endif
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