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/* SPDX-License-Identifier: GPL-2.0 / #ifndef _SPARC64_FUTEX_H #define _SPARC64_FUTEX_H #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \ __asm__ __volatile__( \ "\n1: lduwa [%3] %%asi, %2\n" \ " " insn "\n" \ "2: casa [%3] %%asi, %2, %1\n" \ " cmp %2, %1\n" \ " bne,pn %%icc, 1b\n" \ " mov 0, %0\n" \ "3:\n" \ " .section .fixup,#alloc,#execinstr\n" \ " .align 4\n" \ "4: sethi %%hi(3b), %0\n" \ " jmpl %0 + %%lo(3b), %%g0\n" \ " mov %5, %0\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ " .word 1b, 4b\n" \ " .word 2b, 4b\n" \ " .previous\n" \ : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ : "memory") static inline int arch_futex_atomic_op_inuser(int op, int oparg, int oval, u32 __user uaddr) { int oldval = 0, ret, tem; if (unlikely((((unsigned long) uaddr) & 0x3UL))) return -EINVAL; pagefault_disable(); switch (op) { case FUTEX_OP_SET: __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg); break; case FUTEX_OP_XOR: __futex_cas_op("xor\t%2, %4, %1", 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; __asm__ __volatile__( "\n1: casa [%4] %%asi, %3, %1\n" "2:\n" " .section .fixup,#alloc,#execinstr\n" " .align 4\n" "3: sethi %%hi(2b), %0\n" " jmpl %0 + %%lo(2b), %%g0\n" " mov %5, %0\n" " .previous\n" " .section __ex_table,\"a\"\n" " .align 4\n" " .word 1b, 3b\n" " .previous\n" : "+r" (ret), "=r" (newval) : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) : "memory"); uval = newval; return ret; } #endif / !(_SPARC64_FUTEX_H) */

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