#ifndef _ASM_FUTEX_H #define _ASM_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <asm/errno.h> #include <asm/memory.h> #include <asm/uaccess.h> #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ __asm__ __volatile (SYNC_ON_SMP \ "1: lwarx %0,0,%2\n" \ insn \ "2: stwcx. %1,0,%2\n\ bne- 1b\n\ li %1,0\n\ 3: .section .fixup,\"ax\"\n\ 4: li %1,%3\n\ b 3b\n\ .previous\n\ .section __ex_table,\"a\"\n\ .align 3\n\ .llong 1b,4b,2b,4b\n\ .previous" \ : "=&r" (oldval), "=&r" (ret) \ : "b" (uaddr), "i" (-EFAULT), "1" (oparg) \ : "cr0", "memory") 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("", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("add %1,%0,%1\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("or %1,%0,%1\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("andc %1,%0,%1\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("xor %1,%0,%1\n", 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