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107 lines
2.2 KiB
107 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_HEXAGON_FUTEX_H |
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#define _ASM_HEXAGON_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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/* XXX TODO-- need to add sync barriers! */ |
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#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ |
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__asm__ __volatile( \ |
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"1: %0 = memw_locked(%3);\n" \ |
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/* For example: %1 = %4 */ \ |
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insn \ |
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"2: memw_locked(%3,p2) = %1;\n" \ |
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" if (!p2) jump 1b;\n" \ |
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" %1 = #0;\n" \ |
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"3:\n" \ |
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".section .fixup,\"ax\"\n" \ |
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"4: %1 = #%5;\n" \ |
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" jump 3b\n" \ |
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".previous\n" \ |
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".section __ex_table,\"a\"\n" \ |
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".long 1b,4b,2b,4b\n" \ |
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".previous\n" \ |
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: "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \ |
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: "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ |
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: "p2", "memory") |
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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("%1 = %4\n", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ADD: |
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__futex_atomic_op("%1 = add(%0,%4)\n", ret, oldval, uaddr, |
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oparg); |
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break; |
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case FUTEX_OP_OR: |
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__futex_atomic_op("%1 = or(%0,%4)\n", ret, oldval, uaddr, |
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oparg); |
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break; |
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case FUTEX_OP_ANDN: |
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__futex_atomic_op("%1 = not(%4); %1 = and(%0,%1)\n", ret, |
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oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_XOR: |
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__futex_atomic_op("%1 = xor(%0,%4)\n", ret, oldval, uaddr, |
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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, u32 oldval, |
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u32 newval) |
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{ |
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int prev; |
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int ret; |
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if (!access_ok(uaddr, sizeof(u32))) |
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return -EFAULT; |
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__asm__ __volatile__ ( |
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"1: %1 = memw_locked(%3)\n" |
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" {\n" |
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" p2 = cmp.eq(%1,%4)\n" |
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" if (!p2.new) jump:NT 3f\n" |
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" }\n" |
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"2: memw_locked(%3,p2) = %5\n" |
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" if (!p2) jump 1b\n" |
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"3:\n" |
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".section .fixup,\"ax\"\n" |
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"4: %0 = #%6\n" |
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" jump 3b\n" |
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".previous\n" |
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".section __ex_table,\"a\"\n" |
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".long 1b,4b,2b,4b\n" |
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".previous\n" |
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: "+r" (ret), "=&r" (prev), "+m" (*uaddr) |
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: "r" (uaddr), "r" (oldval), "r" (newval), "i"(-EFAULT) |
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: "p2", "memory"); |
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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 /* _ASM_HEXAGON_FUTEX_H */
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