1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright (c) 1998 by Sun Microsystems, Inc. 28 * All rights reserved. 29 */ 30 31 32 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.2 */ 33 34 #pragma weak elf_newdata = _elf_newdata 35 36 37 #include "syn.h" 38 #include "libelf.h" 39 #include "decl.h" 40 #include "msg.h" 41 42 43 Elf_Data * 44 elf_newdata(Elf_Scn * s) 45 { 46 Dnode * d; 47 Elf_Data * rc; 48 Elf * elf; 49 unsigned work; 50 51 if (s == 0) 52 return (0); 53 elf = s->s_elf; 54 READLOCKS(elf, s) 55 if (s->s_index == SHN_UNDEF) { 56 _elf_seterr(EREQ_SCNNULL, 0); 57 READUNLOCKS(elf, s) 58 return (0); 59 } 60 61 if ((s->s_myflags & SF_READY) == 0) { 62 UPGRADELOCKS(elf, s) 63 /* 64 * re-confirm that another 'thread' hasn't come along 65 * and cooked this section while the locks were 66 * obtained. 67 */ 68 if ((s->s_myflags & SF_READY) == 0) 69 (void) _elf_cookscn(s); 70 DOWNGRADELOCKS(elf, s) 71 } 72 73 /* 74 * If this is the first new node, use the one allocated 75 * in the scn itself. Update data buffer in both cases. 76 */ 77 ELFACCESSDATA(work, _elf_work) 78 if (s->s_hdnode == 0) { 79 s->s_dnode.db_uflags |= ELF_F_DIRTY; 80 s->s_dnode.db_myflags |= DBF_READY; 81 s->s_hdnode = &s->s_dnode; 82 s->s_tlnode = &s->s_dnode; 83 s->s_dnode.db_scn = s; 84 s->s_dnode.db_data.d_version = work; 85 rc = &s->s_dnode.db_data; 86 READUNLOCKS(elf, s) 87 return (rc); 88 } 89 if ((d = _elf_dnode()) == 0) { 90 READUNLOCKS(elf, s) 91 return (0); 92 } 93 NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*d)) 94 d->db_data.d_version = work; 95 d->db_scn = s; 96 d->db_uflags |= ELF_F_DIRTY; 97 d->db_myflags |= DBF_READY; 98 s->s_tlnode->db_next = d; 99 s->s_tlnode = d; 100 rc = &d->db_data; 101 NOTE(NOW_VISIBLE_TO_OTHER_THREADS(*d)) 102 READUNLOCKS(elf, s) 103 return (rc); 104 } 105