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xen
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05/09/2024 07:14:16 AM
rwxr-xr-x
Editing: futex.h
Close
/* * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASM_FUTEX_H #define __ASM_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> #define FUTEX_MAX_LOOPS 128 /* What's the largest number you can think of? */ #define __futex_atomic_op(insn, ret, oldval, uaddr, tmp, oparg) \ do { \ unsigned int loops = FUTEX_MAX_LOOPS; \ \ uaccess_enable(); \ asm volatile( \ " prfm pstl1strm, %2\n" \ "1: ldxr %w1, %2\n" \ insn "\n" \ "2: stlxr %w0, %w3, %2\n" \ " cbz %w0, 3f\n" \ " sub %w4, %w4, %w0\n" \ " cbnz %w4, 1b\n" \ " mov %w0, %w7\n" \ "3:\n" \ " dmb ish\n" \ " .pushsection .fixup,\"ax\"\n" \ " .align 2\n" \ "4: mov %w0, %w6\n" \ " b 3b\n" \ " .popsection\n" \ _ASM_EXTABLE(1b, 4b) \ _ASM_EXTABLE(2b, 4b) \ : "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp), \ "+r" (loops) \ : "r" (oparg), "Ir" (-EFAULT), "Ir" (-EAGAIN) \ : "memory"); \ uaccess_disable(); \ } while (0) static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *_uaddr) { int oldval = 0, ret, tmp; u32 __user *uaddr = __uaccess_mask_ptr(_uaddr); pagefault_disable(); switch (op) { case FUTEX_OP_SET: __futex_atomic_op("mov %w3, %w5", ret, oldval, uaddr, tmp, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("add %w3, %w1, %w5", ret, oldval, uaddr, tmp, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("orr %w3, %w1, %w5", ret, oldval, uaddr, tmp, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("and %w3, %w1, %w5", ret, oldval, uaddr, tmp, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("eor %w3, %w1, %w5", ret, oldval, uaddr, tmp, 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; unsigned int loops = FUTEX_MAX_LOOPS; u32 val, tmp; u32 __user *uaddr; if (!access_ok(VERIFY_WRITE, _uaddr, sizeof(u32))) return -EFAULT; uaddr = __uaccess_mask_ptr(_uaddr); uaccess_enable(); asm volatile("// futex_atomic_cmpxchg_inatomic\n" " prfm pstl1strm, %2\n" "1: ldxr %w1, %2\n" " sub %w3, %w1, %w5\n" " cbnz %w3, 4f\n" "2: stlxr %w3, %w6, %2\n" " cbz %w3, 3f\n" " sub %w4, %w4, %w3\n" " cbnz %w4, 1b\n" " mov %w0, %w8\n" "3:\n" " dmb ish\n" "4:\n" " .pushsection .fixup,\"ax\"\n" "5: mov %w0, %w7\n" " b 4b\n" " .popsection\n" _ASM_EXTABLE(1b, 5b) _ASM_EXTABLE(2b, 5b) : "+r" (ret), "=&r" (val), "+Q" (*uaddr), "=&r" (tmp), "+r" (loops) : "r" (oldval), "r" (newval), "Ir" (-EFAULT), "Ir" (-EAGAIN) : "memory"); uaccess_disable(); if (!ret) *uval = val; return ret; } #endif /* __KERNEL__ */ #endif /* __ASM_FUTEX_H */