#ifndef _ASM_S390_FUTEX_H #define _ASM_S390_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <asm/errno.h> #include <asm/uaccess.h> #ifndef __s390x__ #define __futex_atomic_fixup \ ".section __ex_table,\"a\"\n" \ " .align 4\n" \ " .long 0b,2b,1b,2b\n" \ ".previous" #else /* __s390x__ */ #define __futex_atomic_fixup \ ".section __ex_table,\"a\"\n" \ " .align 8\n" \ " .quad 0b,2b,1b,2b\n" \ ".previous" #endif /* __s390x__ */ #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ asm volatile(" l %1,0(%6)\n" \ "0: " insn \ " cs %1,%2,0(%6)\n" \ "1: jl 0b\n" \ " lhi %0,0\n" \ "2:\n" \ __futex_atomic_fixup \ : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ "=m" (*uaddr) \ : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ "m" (*uaddr) : "cc" ); 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, newval, 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("lr %2,%5\n", ret, oldval, newval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("lr %2,%1\nar %2,%5\n", ret, oldval, newval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("lr %2,%1\nor %2,%5\n", ret, oldval, newval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("lr %2,%1\nnr %2,%5\n", ret, oldval, newval, uaddr, oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("lr %2,%1\nxr %2,%5\n", ret, oldval, newval, 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; } static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) { int ret; if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) return -EFAULT; asm volatile(" cs %1,%4,0(%5)\n" "0: lr %0,%1\n" "1:\n" #ifndef __s390x__ ".section __ex_table,\"a\"\n" " .align 4\n" " .long 0b,1b\n" ".previous" #else /* __s390x__ */ ".section __ex_table,\"a\"\n" " .align 8\n" " .quad 0b,1b\n" ".previous" #endif /* __s390x__ */ : "=d" (ret), "+d" (oldval), "=m" (*uaddr) : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) : "cc", "memory" ); return oldval; } #endif /* __KERNEL__ */ #endif /* _ASM_S390_FUTEX_H */