#ifndef _ASM_FUTEX_H #define _ASM_FUTEX_H #ifdef __KERNEL__ #include <linux/config.h> #include <linux/futex.h> #include <asm/errno.h> #include <asm/uaccess.h> #ifdef CONFIG_SMP #define __FUTEX_SMP_SYNC " sync \n" #else #define __FUTEX_SMP_SYNC #endif #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ { \ __asm__ __volatile__( \ " .set push \n" \ " .set noat \n" \ " .set mips3 \n" \ "1: ll %1, (%3) # __futex_atomic_op1 \n" \ " .set mips0 \n" \ " " insn " \n" \ " .set mips3 \n" \ "2: sc $1, (%3) \n" \ " beqzl $1, 1b \n" \ __FUTEX_SMP_SYNC \ "3: \n" \ " .set pop \n" \ " .set mips0 \n" \ " .section .fixup,\"ax\" \n" \ "4: li %0, %5 \n" \ " j 2b \n" \ " .previous \n" \ " .section __ex_table,\"a\" \n" \ " "__UA_ADDR "\t1b, 4b \n" \ " "__UA_ADDR "\t2b, 4b \n" \ " .previous \n" \ : "=r" (ret), "=r" (oldval) \ : "0" (0), "r" (uaddr), "Jr" (oparg), "i" (-EFAULT)); \ } static inline int futex_atomic_op_inuser (int encoded_op, int __user *uaddr) { int op = (encoded_op >> 28) & 7; int cmp = (encoded_op >> 24) & 15; int oparg = (encoded_op << 8) >> 20; int cmparg = (encoded_op << 20) >> 20; int oldval = 0, ret; if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) oparg = 1 << oparg; if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) return -EFAULT; inc_preempt_count(); switch (op) { case FUTEX_OP_SET: __futex_atomic_op("move $1, %z4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("addu $1, %1, %z4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("or $1, %1, %z4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("and $1, %1, %z4", ret, oldval, uaddr, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("xor $1, %1, %z4", ret, oldval, uaddr, oparg); break; default: ret = -ENOSYS; } dec_preempt_count(); if (!ret) { switch (cmp) { case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; default: ret = -ENOSYS; } } return ret; } #endif #endif