#ifndef _ASM_FUTEX_H #define _ASM_FUTEX_H #include <linux/futex.h> #include <asm/errno.h> #include <asm/system.h> #include <asm/uaccess.h> #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ do { \ register unsigned long r8 __asm ("r8") = 0; \ __asm__ __volatile__( \ " mf;; \n" \ "[1:] " insn ";; \n" \ " .xdata4 \"__ex_table\", 1b-., 2f-. \n" \ "[2:]" \ : "+r" (r8), "=r" (oldval) \ : "r" (uaddr), "r" (oparg) \ : "memory"); \ ret = r8; \ } while (0) #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ do { \ register unsigned long r8 __asm ("r8") = 0; \ int val, newval; \ do { \ __asm__ __volatile__( \ " mf;; \n" \ "[1:] ld4 %3=[%4];; \n" \ " mov %2=%3 \n" \ insn ";; \n" \ " mov ar.ccv=%2;; \n" \ "[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \ " .xdata4 \"__ex_table\", 1b-., 3f-.\n" \ " .xdata4 \"__ex_table\", 2b-., 3f-.\n" \ "[3:]" \ : "+r" (r8), "=r" (val), "=&r" (oldval), \ "=&r" (newval) \ : "r" (uaddr), "r" (oparg) \ : "memory"); \ if (unlikely (r8)) \ break; \ } while (unlikely (val != oldval)); \ ret = r8; \ } while (0) 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_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op2("xor %3=%3,%5", 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) { if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) return -EFAULT; { register unsigned long r8 __asm ("r8"); __asm__ __volatile__( " mf;; \n" " mov ar.ccv=%3;; \n" "[1:] cmpxchg4.acq %0=[%1],%2,ar.ccv \n" " .xdata4 \"__ex_table\", 1b-., 2f-. \n" "[2:]" : "=r" (r8) : "r" (uaddr), "r" (newval), "rO" ((long) (unsigned) oldval) : "memory"); return r8; } } #endif /* _ASM_FUTEX_H */