/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (c) 2006 Ralf Baechle (ralf@linux-mips.org) */ #ifndef _ASM_FUTEX_H #define _ASM_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <asm/barrier.h> #include <asm/errno.h> #include <asm/uaccess.h> #include <asm/war.h> #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ { \ if (cpu_has_llsc && R10000_LLSC_WAR) { \ __asm__ __volatile__( \ " .set push \n" \ " .set noat \n" \ " .set mips3 \n" \ "1: ll %1, %4 # __futex_atomic_op \n" \ " .set mips0 \n" \ " " insn " \n" \ " .set mips3 \n" \ "2: sc $1, %2 \n" \ " beqzl $1, 1b \n" \ __WEAK_LLSC_MB \ "3: \n" \ " .set pop \n" \ " .set mips0 \n" \ " .section .fixup,\"ax\" \n" \ "4: li %0, %6 \n" \ " j 3b \n" \ " .previous \n" \ " .section __ex_table,\"a\" \n" \ " "__UA_ADDR "\t1b, 4b \n" \ " "__UA_ADDR "\t2b, 4b \n" \ " .previous \n" \ : "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \ : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \ : "memory"); \ } else if (cpu_has_llsc) { \ __asm__ __volatile__( \ " .set push \n" \ " .set noat \n" \ " .set mips3 \n" \ "1: ll %1, %4 # __futex_atomic_op \n" \ " .set mips0 \n" \ " " insn " \n" \ " .set mips3 \n" \ "2: sc $1, %2 \n" \ " beqz $1, 1b \n" \ __WEAK_LLSC_MB \ "3: \n" \ " .set pop \n" \ " .set mips0 \n" \ " .section .fixup,\"ax\" \n" \ "4: li %0, %6 \n" \ " j 3b \n" \ " .previous \n" \ " .section __ex_table,\"a\" \n" \ " "__UA_ADDR "\t1b, 4b \n" \ " "__UA_ADDR "\t2b, 4b \n" \ " .previous \n" \ : "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \ : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \ : "memory"); \ } else \ ret = -ENOSYS; \ } 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; pagefault_disable(); switch (op) { case FUTEX_OP_SET: __futex_atomic_op("move $1, %z5", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("addu $1, %1, %z5", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("or $1, %1, %z5", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("and $1, %1, %z5", ret, oldval, uaddr, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("xor $1, %1, %z5", ret, oldval, uaddr, oparg); break; default: ret = -ENOSYS; } pagefault_enable(); 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; } static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) { int retval; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) return -EFAULT; if (cpu_has_llsc && R10000_LLSC_WAR) { __asm__ __volatile__( "# futex_atomic_cmpxchg_inatomic \n" " .set push \n" " .set noat \n" " .set mips3 \n" "1: ll %0, %2 \n" " bne %0, %z3, 3f \n" " .set mips0 \n" " move $1, %z4 \n" " .set mips3 \n" "2: sc $1, %1 \n" " beqzl $1, 1b \n" __WEAK_LLSC_MB "3: \n" " .set pop \n" " .section .fixup,\"ax\" \n" "4: li %0, %5 \n" " j 3b \n" " .previous \n" " .section __ex_table,\"a\" \n" " "__UA_ADDR "\t1b, 4b \n" " "__UA_ADDR "\t2b, 4b \n" " .previous \n" : "=&r" (retval), "=R" (*uaddr) : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT) : "memory"); } else if (cpu_has_llsc) { __asm__ __volatile__( "# futex_atomic_cmpxchg_inatomic \n" " .set push \n" " .set noat \n" " .set mips3 \n" "1: ll %0, %2 \n" " bne %0, %z3, 3f \n" " .set mips0 \n" " move $1, %z4 \n" " .set mips3 \n" "2: sc $1, %1 \n" " beqz $1, 1b \n" __WEAK_LLSC_MB "3: \n" " .set pop \n" " .section .fixup,\"ax\" \n" "4: li %0, %5 \n" " j 3b \n" " .previous \n" " .section __ex_table,\"a\" \n" " "__UA_ADDR "\t1b, 4b \n" " "__UA_ADDR "\t2b, 4b \n" " .previous \n" : "=&r" (retval), "=R" (*uaddr) : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT) : "memory"); } else return -ENOSYS; return retval; } #endif #endif /* _ASM_FUTEX_H */