1 /* $NetBSD: netbsd32_futex.c,v 1.1 2020/04/26 18:53:33 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 The NetBSD Foundation. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell and Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: netbsd32_futex.c,v 1.1 2020/04/26 18:53:33 thorpej Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/lwp.h> 40 #include <sys/syscallargs.h> 41 #include <sys/futex.h> 42 43 #include <compat/netbsd32/netbsd32.h> 44 #include <compat/netbsd32/netbsd32_syscallargs.h> 45 #include <compat/netbsd32/netbsd32_conv.h> 46 47 /* Sycalls conversion */ 48 49 int 50 netbsd32___futex(struct lwp *l, const struct netbsd32___futex_args *uap, 51 register_t *retval) 52 { 53 /* { 54 syscallarg(netbsd32_intp) uaddr; 55 syscallarg(int) op; 56 syscallarg(int) val; 57 syscallarg(netbsd32_timespecp_t) timeout; 58 syscallarg(netbsd32_intp) uaddr2; 59 syscallarg(int) val2; 60 syscallarg(int) val3; 61 } */ 62 struct netbsd32_timespec ts32; 63 struct timespec ts, *tsp; 64 int error; 65 66 /* 67 * Copy in the timeout argument, if specified. 68 */ 69 if (SCARG_P32(uap, timeout)) { 70 error = copyin(SCARG_P32(uap, timeout), &ts32, sizeof(ts32)); 71 if (error) 72 return error; 73 netbsd32_to_timespec(&ts32, &ts); 74 tsp = &ts; 75 } else { 76 tsp = NULL; 77 } 78 79 return do_futex(SCARG_P32(uap, uaddr), SCARG(uap, op), 80 SCARG(uap, val), tsp, SCARG_P32(uap, uaddr2), SCARG(uap, val2), 81 SCARG(uap, val3), retval); 82 } 83 84 int 85 netbsd32___futex_set_robust_list(struct lwp *l, 86 const struct netbsd32___futex_set_robust_list_args *uap, register_t *retval) 87 { 88 /* { 89 syscallarg(netbsd32_voidp) head; 90 syscallarg(netbsd32_size_t) len; 91 } */ 92 void *head = SCARG_P32(uap, head); 93 94 if (SCARG(uap, len) != _FUTEX_ROBUST_HEAD_SIZE32) 95 return EINVAL; 96 if ((uintptr_t)head % sizeof(uint32_t)) 97 return EINVAL; 98 99 l->l_robust_head = (uintptr_t)head; 100 101 return 0; 102 } 103 104 int 105 netbsd32___futex_get_robust_list(struct lwp *l, 106 const struct netbsd32___futex_get_robust_list_args *uap, register_t *retval) 107 { 108 /* { 109 syscallarg(lwpid_t) lwpid; 110 syscallarg(netbsd32_voidp) headp; 111 syscallarg(netbsd32_size_tp) lenp; 112 } */ 113 void *head; 114 const netbsd32_size_t len = _FUTEX_ROBUST_HEAD_SIZE32; 115 netbsd32_voidp head32; 116 int error; 117 118 error = futex_robust_head_lookup(l, SCARG(uap, lwpid), &head); 119 if (error) 120 return error; 121 122 head32.i32 = (uintptr_t)head; 123 if (NETBSD32PTR64(head32) != head) 124 return EFAULT; 125 126 /* Copy out the head pointer and the head structure length. */ 127 /* (N.B.: "headp" is actually a "void **". */ 128 error = copyout(&head32, SCARG_P32(uap, headp), sizeof(head32)); 129 if (__predict_true(error == 0)) { 130 error = copyout(&len, SCARG_P32(uap, lenp), sizeof(len)); 131 } 132 133 return error; 134 } 135