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/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2006 Ralf Baechle (ralf@linux-mips.org) * Copyright (c) 2018 Jim Wilson (jimw@sifive.com) */ #ifndef _ASM_FUTEX_H #define _ASM_FUTEX_H #include <linux/futex.h> #include <linux/uaccess.h> #include <linux/errno.h> #include <asm/asm.h> #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ { \ uintptr_t tmp; \ __enable_user_access(); \ __asm__ __volatile__ ( \ "1: " insn " \n" \ "2: \n" \ " .section .fixup,\"ax\" \n" \ " .balign 4 \n" \ "3: li %[r],%[e] \n" \ " jump 2b,%[t] \n" \ " .previous \n" \ " .section __ex_table,\"a\" \n" \ " .balign " RISCV_SZPTR " \n" \ " " RISCV_PTR " 1b, 3b \n" \ " .previous \n" \ : [r] "+r" (ret), [ov] "=&r" (oldval), \ [u] "+m" (*uaddr), [t] "=&r" (tmp) \ : [op] "Jr" (oparg), [e] "i" (-EFAULT) \ : "memory"); \ __disable_user_access(); \ } static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) { int oldval = 0, ret = 0; pagefault_disable(); switch (op) { case FUTEX_OP_SET: __futex_atomic_op("amoswap.w.aqrl %[ov],%z[op],%[u]", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("amoadd.w.aqrl %[ov],%z[op],%[u]", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("amoor.w.aqrl %[ov],%z[op],%[u]", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("amoand.w.aqrl %[ov],%z[op],%[u]", ret, oldval, uaddr, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("amoxor.w.aqrl %[ov],%z[op],%[u]", ret, oldval, uaddr, oparg); break; default: ret = -ENOSYS; } pagefault_enable(); if (!ret) *oval = oldval; return ret; } static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) { int ret = 0; u32 val; uintptr_t tmp; if (!access_ok(uaddr, sizeof(u32))) return -EFAULT; __enable_user_access(); __asm__ __volatile__ ( "1: lr.w.aqrl %[v],%[u] \n" " bne %[v],%z[ov],3f \n" "2: sc.w.aqrl %[t],%z[nv],%[u] \n" " bnez %[t],1b \n" "3: \n" " .section .fixup,\"ax\" \n" " .balign 4 \n" "4: li %[r],%[e] \n" " jump 3b,%[t] \n" " .previous \n" " .section __ex_table,\"a\" \n" " .balign " RISCV_SZPTR " \n" " " RISCV_PTR " 1b, 4b \n" " " RISCV_PTR " 2b, 4b \n" " .previous \n" : [r] "+r" (ret), [v] "=&r" (val), [u] "+m" (*uaddr), [t] "=&r" (tmp) : [ov] "Jr" (oldval), [nv] "Jr" (newval), [e] "i" (-EFAULT) : "memory"); __disable_user_access(); *uval = val; return ret; } #endif /* _ASM_FUTEX_H */
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