17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 50bc07c75Srie * Common Development and Distribution License (the "License"). 60bc07c75Srie * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217c478bd9Sstevel@tonic-gate 227c478bd9Sstevel@tonic-gate /* 230bc07c75Srie * Copyright (c) 1988 AT&T 240bc07c75Srie * All Rights Reserved 250bc07c75Srie * 260bc07c75Srie * 27*ba2be530Sab * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 287c478bd9Sstevel@tonic-gate * Use is subject to license terms. 297c478bd9Sstevel@tonic-gate */ 307c478bd9Sstevel@tonic-gate 317c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 327c478bd9Sstevel@tonic-gate 337c478bd9Sstevel@tonic-gate #if !defined(_ELF64) 347c478bd9Sstevel@tonic-gate #pragma weak elf_update = _elf_update 357c478bd9Sstevel@tonic-gate #endif 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate #include "syn.h" 387c478bd9Sstevel@tonic-gate #include <memory.h> 397c478bd9Sstevel@tonic-gate #include <malloc.h> 407c478bd9Sstevel@tonic-gate #include <limits.h> 417c478bd9Sstevel@tonic-gate 427c478bd9Sstevel@tonic-gate #include <sgs.h> 437c478bd9Sstevel@tonic-gate #include "decl.h" 447c478bd9Sstevel@tonic-gate #include "msg.h" 457c478bd9Sstevel@tonic-gate 467c478bd9Sstevel@tonic-gate /* 477c478bd9Sstevel@tonic-gate * This module is compiled twice, the second time having 487c478bd9Sstevel@tonic-gate * -D_ELF64 defined. The following set of macros, along 497c478bd9Sstevel@tonic-gate * with machelf.h, represent the differences between the 507c478bd9Sstevel@tonic-gate * two compilations. Be careful *not* to add any class- 517c478bd9Sstevel@tonic-gate * dependent code (anything that has elf32 or elf64 in the 527c478bd9Sstevel@tonic-gate * name) to this code without hiding it behind a switch- 537c478bd9Sstevel@tonic-gate * able macro like these. 547c478bd9Sstevel@tonic-gate */ 557c478bd9Sstevel@tonic-gate #if defined(_ELF64) 567c478bd9Sstevel@tonic-gate 577c478bd9Sstevel@tonic-gate #define FSZ_LONG ELF64_FSZ_XWORD 587c478bd9Sstevel@tonic-gate #define ELFCLASS ELFCLASS64 597c478bd9Sstevel@tonic-gate #define _elf_snode_init _elf64_snode_init 607c478bd9Sstevel@tonic-gate #define _elfxx_cookscn _elf64_cookscn 617c478bd9Sstevel@tonic-gate #define _elf_upd_lib _elf64_upd_lib 627c478bd9Sstevel@tonic-gate #define elf_fsize elf64_fsize 637c478bd9Sstevel@tonic-gate #define _elf_entsz _elf64_entsz 647c478bd9Sstevel@tonic-gate #define _elf_msize _elf64_msize 657c478bd9Sstevel@tonic-gate #define _elf_upd_usr _elf64_upd_usr 667c478bd9Sstevel@tonic-gate #define wrt wrt64 677c478bd9Sstevel@tonic-gate #define elf_xlatetof elf64_xlatetof 687c478bd9Sstevel@tonic-gate #define _elfxx_update _elf64_update 69*ba2be530Sab #define _elfxx_swap_wrimage _elf64_swap_wrimage 707c478bd9Sstevel@tonic-gate 717c478bd9Sstevel@tonic-gate #else /* ELF32 */ 727c478bd9Sstevel@tonic-gate 737c478bd9Sstevel@tonic-gate #define FSZ_LONG ELF32_FSZ_WORD 747c478bd9Sstevel@tonic-gate #define ELFCLASS ELFCLASS32 757c478bd9Sstevel@tonic-gate #define _elf_snode_init _elf32_snode_init 767c478bd9Sstevel@tonic-gate #define _elfxx_cookscn _elf32_cookscn 777c478bd9Sstevel@tonic-gate #define _elf_upd_lib _elf32_upd_lib 787c478bd9Sstevel@tonic-gate #define elf_fsize elf32_fsize 797c478bd9Sstevel@tonic-gate #define _elf_entsz _elf32_entsz 807c478bd9Sstevel@tonic-gate #define _elf_msize _elf32_msize 817c478bd9Sstevel@tonic-gate #define _elf_upd_usr _elf32_upd_usr 827c478bd9Sstevel@tonic-gate #define wrt wrt32 837c478bd9Sstevel@tonic-gate #define elf_xlatetof elf32_xlatetof 847c478bd9Sstevel@tonic-gate #define _elfxx_update _elf32_update 85*ba2be530Sab #define _elfxx_swap_wrimage _elf32_swap_wrimage 867c478bd9Sstevel@tonic-gate 877c478bd9Sstevel@tonic-gate #endif /* ELF64 */ 887c478bd9Sstevel@tonic-gate 897c478bd9Sstevel@tonic-gate 907c478bd9Sstevel@tonic-gate /* 917c478bd9Sstevel@tonic-gate * Output file update 927c478bd9Sstevel@tonic-gate * These functions walk an Elf structure, update its information, 937c478bd9Sstevel@tonic-gate * and optionally write the output file. Because the application 947c478bd9Sstevel@tonic-gate * may control of the output file layout, two upd_... routines 957c478bd9Sstevel@tonic-gate * exist. They're similar but too different to merge cleanly. 967c478bd9Sstevel@tonic-gate * 977c478bd9Sstevel@tonic-gate * The library defines a "dirty" bit to force parts of the file 987c478bd9Sstevel@tonic-gate * to be written on update. These routines ignore the dirty bit 997c478bd9Sstevel@tonic-gate * and do everything. A minimal update routine might be useful 1007c478bd9Sstevel@tonic-gate * someday. 1017c478bd9Sstevel@tonic-gate */ 1027c478bd9Sstevel@tonic-gate 1037c478bd9Sstevel@tonic-gate static size_t 1047c478bd9Sstevel@tonic-gate _elf_upd_lib(Elf * elf) 1057c478bd9Sstevel@tonic-gate { 1067c478bd9Sstevel@tonic-gate NOTE(ASSUMING_PROTECTED(*elf)) 1077c478bd9Sstevel@tonic-gate Lword hi; 1087c478bd9Sstevel@tonic-gate Lword hibit; 1097c478bd9Sstevel@tonic-gate Elf_Scn * s; 1107c478bd9Sstevel@tonic-gate register Xword sz; 1117c478bd9Sstevel@tonic-gate Ehdr * eh = elf->ed_ehdr; 1127c478bd9Sstevel@tonic-gate unsigned ver = eh->e_version; 1137c478bd9Sstevel@tonic-gate register char *p = (char *)eh->e_ident; 1147c478bd9Sstevel@tonic-gate size_t scncnt; 1157c478bd9Sstevel@tonic-gate 1167c478bd9Sstevel@tonic-gate /* 1177c478bd9Sstevel@tonic-gate * Ehdr and Phdr table go first 1187c478bd9Sstevel@tonic-gate */ 1197c478bd9Sstevel@tonic-gate p[EI_MAG0] = ELFMAG0; 1207c478bd9Sstevel@tonic-gate p[EI_MAG1] = ELFMAG1; 1217c478bd9Sstevel@tonic-gate p[EI_MAG2] = ELFMAG2; 1227c478bd9Sstevel@tonic-gate p[EI_MAG3] = ELFMAG3; 1237c478bd9Sstevel@tonic-gate p[EI_CLASS] = ELFCLASS; 1247c478bd9Sstevel@tonic-gate /* LINTED */ 1257c478bd9Sstevel@tonic-gate p[EI_VERSION] = (Byte)ver; 1267c478bd9Sstevel@tonic-gate hi = elf_fsize(ELF_T_EHDR, 1, ver); 1277c478bd9Sstevel@tonic-gate /* LINTED */ 1287c478bd9Sstevel@tonic-gate eh->e_ehsize = (Half)hi; 1297c478bd9Sstevel@tonic-gate if (eh->e_phnum != 0) { 1307c478bd9Sstevel@tonic-gate /* LINTED */ 1317c478bd9Sstevel@tonic-gate eh->e_phentsize = (Half)elf_fsize(ELF_T_PHDR, 1, ver); 1327c478bd9Sstevel@tonic-gate /* LINTED */ 1337c478bd9Sstevel@tonic-gate eh->e_phoff = (Off)hi; 1347c478bd9Sstevel@tonic-gate hi += eh->e_phentsize * eh->e_phnum; 1357c478bd9Sstevel@tonic-gate } else { 1367c478bd9Sstevel@tonic-gate eh->e_phoff = 0; 1377c478bd9Sstevel@tonic-gate eh->e_phentsize = 0; 1387c478bd9Sstevel@tonic-gate } 1397c478bd9Sstevel@tonic-gate 1407c478bd9Sstevel@tonic-gate /* 1410bc07c75Srie * Obtain the first section header. Typically, this section has NULL 1420bc07c75Srie * contents, however in the case of Extended ELF Sections this section 1430bc07c75Srie * is used to hold an alternative e_shnum, e_shstrndx and e_phnum. 1440bc07c75Srie * On initial allocation (see _elf_snode) the elements of this section 1450bc07c75Srie * would have been zeroed. The e_shnum is initialized later, after the 1460bc07c75Srie * section header count has been determined. The e_shstrndx and 1470bc07c75Srie * e_phnum may have already been initialized by the caller (for example, 1480bc07c75Srie * gelf_update_shdr() in mcs(1)). 1497c478bd9Sstevel@tonic-gate */ 1507c478bd9Sstevel@tonic-gate if ((s = elf->ed_hdscn) == 0) { 1517c478bd9Sstevel@tonic-gate eh->e_shnum = 0; 1527c478bd9Sstevel@tonic-gate scncnt = 0; 1537c478bd9Sstevel@tonic-gate } else { 1547c478bd9Sstevel@tonic-gate s = s->s_next; 1550bc07c75Srie scncnt = 1; 1567c478bd9Sstevel@tonic-gate } 1577c478bd9Sstevel@tonic-gate 1580bc07c75Srie /* 1590bc07c75Srie * Loop through sections. Compute section size before changing hi. 1600bc07c75Srie * Allow null buffers for NOBITS. 1610bc07c75Srie */ 1627c478bd9Sstevel@tonic-gate hibit = 0; 1637c478bd9Sstevel@tonic-gate for (; s != 0; s = s->s_next) { 1647c478bd9Sstevel@tonic-gate register Dnode *d; 1657c478bd9Sstevel@tonic-gate register Lword fsz, j; 1667c478bd9Sstevel@tonic-gate Shdr *sh = s->s_shdr; 1677c478bd9Sstevel@tonic-gate 1687c478bd9Sstevel@tonic-gate scncnt++; 1697c478bd9Sstevel@tonic-gate if (sh->sh_type == SHT_NULL) { 1707c478bd9Sstevel@tonic-gate *sh = _elf_snode_init.sb_shdr; 1717c478bd9Sstevel@tonic-gate continue; 1727c478bd9Sstevel@tonic-gate } 1737c478bd9Sstevel@tonic-gate 1747c478bd9Sstevel@tonic-gate if ((s->s_myflags & SF_READY) == 0) 1757c478bd9Sstevel@tonic-gate (void) _elfxx_cookscn(s); 1767c478bd9Sstevel@tonic-gate 1777c478bd9Sstevel@tonic-gate sh->sh_addralign = 1; 1787a5d89c4Sab if ((sz = (Xword)_elf_entsz(elf, sh->sh_type, ver)) != 0) 1797c478bd9Sstevel@tonic-gate /* LINTED */ 1807c478bd9Sstevel@tonic-gate sh->sh_entsize = (Half)sz; 1817c478bd9Sstevel@tonic-gate sz = 0; 1827c478bd9Sstevel@tonic-gate for (d = s->s_hdnode; d != 0; d = d->db_next) { 1837c478bd9Sstevel@tonic-gate if ((fsz = elf_fsize(d->db_data.d_type, 1847c478bd9Sstevel@tonic-gate 1, ver)) == 0) 1857c478bd9Sstevel@tonic-gate return (0); 1867c478bd9Sstevel@tonic-gate 1877c478bd9Sstevel@tonic-gate j = _elf_msize(d->db_data.d_type, ver); 1887c478bd9Sstevel@tonic-gate fsz *= (d->db_data.d_size / j); 1897c478bd9Sstevel@tonic-gate d->db_osz = (size_t)fsz; 1907c478bd9Sstevel@tonic-gate if ((j = d->db_data.d_align) > 1) { 1917c478bd9Sstevel@tonic-gate if (j > sh->sh_addralign) 1927c478bd9Sstevel@tonic-gate sh->sh_addralign = (Xword)j; 1937c478bd9Sstevel@tonic-gate 1947c478bd9Sstevel@tonic-gate if (sz % j != 0) 1957c478bd9Sstevel@tonic-gate sz += j - sz % j; 1967c478bd9Sstevel@tonic-gate } 1977c478bd9Sstevel@tonic-gate d->db_data.d_off = (off_t)sz; 1987c478bd9Sstevel@tonic-gate d->db_xoff = sz; 1997c478bd9Sstevel@tonic-gate sz += (Xword)fsz; 2007c478bd9Sstevel@tonic-gate } 2017c478bd9Sstevel@tonic-gate 2027c478bd9Sstevel@tonic-gate sh->sh_size = sz; 2037c478bd9Sstevel@tonic-gate /* 2047c478bd9Sstevel@tonic-gate * We want to take into account the offsets for NOBITS 2057c478bd9Sstevel@tonic-gate * sections and let the "sh_offsets" point to where 2067c478bd9Sstevel@tonic-gate * the section would 'conceptually' fit within 2077c478bd9Sstevel@tonic-gate * the file (as required by the ABI). 2087c478bd9Sstevel@tonic-gate * 2097c478bd9Sstevel@tonic-gate * But - we must also make sure that the NOBITS does 2107c478bd9Sstevel@tonic-gate * not take up any actual space in the file. We preserve 2117c478bd9Sstevel@tonic-gate * the actual offset into the file in the 'hibit' variable. 2127c478bd9Sstevel@tonic-gate * When we come to the first non-NOBITS section after a 2137c478bd9Sstevel@tonic-gate * encountering a NOBITS section the hi counter is restored 2147c478bd9Sstevel@tonic-gate * to its proper place in the file. 2157c478bd9Sstevel@tonic-gate */ 2167c478bd9Sstevel@tonic-gate if (sh->sh_type == SHT_NOBITS) { 2177c478bd9Sstevel@tonic-gate if (hibit == 0) 2187c478bd9Sstevel@tonic-gate hibit = hi; 2197c478bd9Sstevel@tonic-gate } else { 2207c478bd9Sstevel@tonic-gate if (hibit) { 2217c478bd9Sstevel@tonic-gate hi = hibit; 2227c478bd9Sstevel@tonic-gate hibit = 0; 2237c478bd9Sstevel@tonic-gate } 2247c478bd9Sstevel@tonic-gate } 2257c478bd9Sstevel@tonic-gate j = sh->sh_addralign; 2267c478bd9Sstevel@tonic-gate if ((fsz = hi % j) != 0) 2277c478bd9Sstevel@tonic-gate hi += j - fsz; 2287c478bd9Sstevel@tonic-gate 2297c478bd9Sstevel@tonic-gate /* LINTED */ 2307c478bd9Sstevel@tonic-gate sh->sh_offset = (Off)hi; 2317c478bd9Sstevel@tonic-gate hi += sz; 2327c478bd9Sstevel@tonic-gate } 2337c478bd9Sstevel@tonic-gate 2347c478bd9Sstevel@tonic-gate /* 2357c478bd9Sstevel@tonic-gate * if last section was a 'NOBITS' section then we need to 2367c478bd9Sstevel@tonic-gate * restore the 'hi' counter to point to the end of the last 2377c478bd9Sstevel@tonic-gate * non 'NOBITS' section. 2387c478bd9Sstevel@tonic-gate */ 2397c478bd9Sstevel@tonic-gate if (hibit) { 2407c478bd9Sstevel@tonic-gate hi = hibit; 2417c478bd9Sstevel@tonic-gate hibit = 0; 2427c478bd9Sstevel@tonic-gate } 2437c478bd9Sstevel@tonic-gate 2447c478bd9Sstevel@tonic-gate /* 2457c478bd9Sstevel@tonic-gate * Shdr table last 2467c478bd9Sstevel@tonic-gate */ 2477c478bd9Sstevel@tonic-gate if (scncnt != 0) { 2487c478bd9Sstevel@tonic-gate if (hi % FSZ_LONG != 0) 2497c478bd9Sstevel@tonic-gate hi += FSZ_LONG - hi % FSZ_LONG; 2507c478bd9Sstevel@tonic-gate /* LINTED */ 2517c478bd9Sstevel@tonic-gate eh->e_shoff = (Off)hi; 2527c478bd9Sstevel@tonic-gate /* 2537c478bd9Sstevel@tonic-gate * If we are using 'extended sections' then the 2547c478bd9Sstevel@tonic-gate * e_shnum is stored in the sh_size field of the 2557c478bd9Sstevel@tonic-gate * first section header. 2567c478bd9Sstevel@tonic-gate * 2577c478bd9Sstevel@tonic-gate * NOTE: we set e_shnum to '0' because it's specified 2587c478bd9Sstevel@tonic-gate * this way in the gABI, and in the hopes that 2597c478bd9Sstevel@tonic-gate * this will cause less problems to unaware 2607c478bd9Sstevel@tonic-gate * tools then if we'd set it to SHN_XINDEX (0xffff). 2617c478bd9Sstevel@tonic-gate */ 2627c478bd9Sstevel@tonic-gate if (scncnt < SHN_LORESERVE) 2637c478bd9Sstevel@tonic-gate eh->e_shnum = scncnt; 2647c478bd9Sstevel@tonic-gate else { 2657c478bd9Sstevel@tonic-gate Shdr *sh; 2667c478bd9Sstevel@tonic-gate sh = (Shdr *)elf->ed_hdscn->s_shdr; 2677c478bd9Sstevel@tonic-gate sh->sh_size = scncnt; 2687c478bd9Sstevel@tonic-gate eh->e_shnum = 0; 2697c478bd9Sstevel@tonic-gate } 2707c478bd9Sstevel@tonic-gate /* LINTED */ 2717c478bd9Sstevel@tonic-gate eh->e_shentsize = (Half)elf_fsize(ELF_T_SHDR, 1, ver); 2727c478bd9Sstevel@tonic-gate hi += eh->e_shentsize * scncnt; 2737c478bd9Sstevel@tonic-gate } else { 2747c478bd9Sstevel@tonic-gate eh->e_shoff = 0; 2757c478bd9Sstevel@tonic-gate eh->e_shentsize = 0; 2767c478bd9Sstevel@tonic-gate } 2777c478bd9Sstevel@tonic-gate 2787c478bd9Sstevel@tonic-gate #if !(defined(_LP64) && defined(_ELF64)) 2797c478bd9Sstevel@tonic-gate if (hi > INT_MAX) { 2807c478bd9Sstevel@tonic-gate _elf_seterr(EFMT_FBIG, 0); 2817c478bd9Sstevel@tonic-gate return (0); 2827c478bd9Sstevel@tonic-gate } 2837c478bd9Sstevel@tonic-gate #endif 2847c478bd9Sstevel@tonic-gate 2857c478bd9Sstevel@tonic-gate return ((size_t)hi); 2867c478bd9Sstevel@tonic-gate } 2877c478bd9Sstevel@tonic-gate 2887c478bd9Sstevel@tonic-gate 2897c478bd9Sstevel@tonic-gate 2907c478bd9Sstevel@tonic-gate static size_t 2917c478bd9Sstevel@tonic-gate _elf_upd_usr(Elf * elf) 2927c478bd9Sstevel@tonic-gate { 2937c478bd9Sstevel@tonic-gate NOTE(ASSUMING_PROTECTED(*elf)) 2947c478bd9Sstevel@tonic-gate Lword hi; 2957c478bd9Sstevel@tonic-gate Elf_Scn * s; 2967c478bd9Sstevel@tonic-gate register Xword sz; 2977c478bd9Sstevel@tonic-gate Ehdr * eh = elf->ed_ehdr; 2987c478bd9Sstevel@tonic-gate unsigned ver = eh->e_version; 2997c478bd9Sstevel@tonic-gate register char *p = (char *)eh->e_ident; 3007c478bd9Sstevel@tonic-gate 3017c478bd9Sstevel@tonic-gate 3027c478bd9Sstevel@tonic-gate /* 3037c478bd9Sstevel@tonic-gate * Ehdr and Phdr table go first 3047c478bd9Sstevel@tonic-gate */ 3057c478bd9Sstevel@tonic-gate p[EI_MAG0] = ELFMAG0; 3067c478bd9Sstevel@tonic-gate p[EI_MAG1] = ELFMAG1; 3077c478bd9Sstevel@tonic-gate p[EI_MAG2] = ELFMAG2; 3087c478bd9Sstevel@tonic-gate p[EI_MAG3] = ELFMAG3; 3097c478bd9Sstevel@tonic-gate p[EI_CLASS] = ELFCLASS; 3107c478bd9Sstevel@tonic-gate /* LINTED */ 3117c478bd9Sstevel@tonic-gate p[EI_VERSION] = (Byte)ver; 3127c478bd9Sstevel@tonic-gate hi = elf_fsize(ELF_T_EHDR, 1, ver); 3137c478bd9Sstevel@tonic-gate /* LINTED */ 3147c478bd9Sstevel@tonic-gate eh->e_ehsize = (Half)hi; 3157c478bd9Sstevel@tonic-gate 3167c478bd9Sstevel@tonic-gate /* 3177c478bd9Sstevel@tonic-gate * If phnum is zero, phoff "should" be zero too, 3187c478bd9Sstevel@tonic-gate * but the application is responsible for it. 3197c478bd9Sstevel@tonic-gate * Allow a non-zero value here and update the 3207c478bd9Sstevel@tonic-gate * hi water mark accordingly. 3217c478bd9Sstevel@tonic-gate */ 3227c478bd9Sstevel@tonic-gate 3237c478bd9Sstevel@tonic-gate if (eh->e_phnum != 0) 3247c478bd9Sstevel@tonic-gate /* LINTED */ 3257c478bd9Sstevel@tonic-gate eh->e_phentsize = (Half)elf_fsize(ELF_T_PHDR, 1, ver); 3267c478bd9Sstevel@tonic-gate else 3277c478bd9Sstevel@tonic-gate eh->e_phentsize = 0; 3287c478bd9Sstevel@tonic-gate if ((sz = eh->e_phoff + eh->e_phentsize * eh->e_phnum) > hi) 3297c478bd9Sstevel@tonic-gate hi = sz; 3307c478bd9Sstevel@tonic-gate 3317c478bd9Sstevel@tonic-gate /* 3327c478bd9Sstevel@tonic-gate * Loop through sections, skipping index zero. 3337c478bd9Sstevel@tonic-gate * Compute section size before changing hi. 3347c478bd9Sstevel@tonic-gate * Allow null buffers for NOBITS. 3357c478bd9Sstevel@tonic-gate */ 3367c478bd9Sstevel@tonic-gate 3377c478bd9Sstevel@tonic-gate if ((s = elf->ed_hdscn) == 0) 3387c478bd9Sstevel@tonic-gate eh->e_shnum = 0; 3397c478bd9Sstevel@tonic-gate else { 3407c478bd9Sstevel@tonic-gate eh->e_shnum = 1; 3417c478bd9Sstevel@tonic-gate *(Shdr*)s->s_shdr = _elf_snode_init.sb_shdr; 3427c478bd9Sstevel@tonic-gate s = s->s_next; 3437c478bd9Sstevel@tonic-gate } 3447c478bd9Sstevel@tonic-gate for (; s != 0; s = s->s_next) { 3457c478bd9Sstevel@tonic-gate register Dnode *d; 3467c478bd9Sstevel@tonic-gate register Xword fsz, j; 3477c478bd9Sstevel@tonic-gate Shdr *sh = s->s_shdr; 3487c478bd9Sstevel@tonic-gate 3497c478bd9Sstevel@tonic-gate if ((s->s_myflags & SF_READY) == 0) 3507c478bd9Sstevel@tonic-gate (void) _elfxx_cookscn(s); 3517c478bd9Sstevel@tonic-gate 3527c478bd9Sstevel@tonic-gate ++eh->e_shnum; 3537c478bd9Sstevel@tonic-gate sz = 0; 3547c478bd9Sstevel@tonic-gate for (d = s->s_hdnode; d != 0; d = d->db_next) { 3557c478bd9Sstevel@tonic-gate if ((fsz = (Xword)elf_fsize(d->db_data.d_type, 1, 3567c478bd9Sstevel@tonic-gate ver)) == 0) 3577c478bd9Sstevel@tonic-gate return (0); 3587c478bd9Sstevel@tonic-gate j = (Xword)_elf_msize(d->db_data.d_type, ver); 3597c478bd9Sstevel@tonic-gate fsz *= (Xword)(d->db_data.d_size / j); 3607c478bd9Sstevel@tonic-gate d->db_osz = (size_t)fsz; 3617c478bd9Sstevel@tonic-gate 3627c478bd9Sstevel@tonic-gate if ((sh->sh_type != SHT_NOBITS) && 363*ba2be530Sab ((j = (Xword)(d->db_data.d_off + d->db_osz)) > sz)) 3647c478bd9Sstevel@tonic-gate sz = j; 3657c478bd9Sstevel@tonic-gate } 3667c478bd9Sstevel@tonic-gate if (sh->sh_size < sz) { 3677c478bd9Sstevel@tonic-gate _elf_seterr(EFMT_SCNSZ, 0); 3687c478bd9Sstevel@tonic-gate return (0); 3697c478bd9Sstevel@tonic-gate } 3707c478bd9Sstevel@tonic-gate if ((sh->sh_type != SHT_NOBITS) && 3717c478bd9Sstevel@tonic-gate (hi < sh->sh_offset + sh->sh_size)) 3727c478bd9Sstevel@tonic-gate hi = sh->sh_offset + sh->sh_size; 3737c478bd9Sstevel@tonic-gate } 3747c478bd9Sstevel@tonic-gate 3757c478bd9Sstevel@tonic-gate /* 3767c478bd9Sstevel@tonic-gate * Shdr table last. Comment above for phnum/phoff applies here. 3777c478bd9Sstevel@tonic-gate */ 3787c478bd9Sstevel@tonic-gate if (eh->e_shnum != 0) 3797c478bd9Sstevel@tonic-gate /* LINTED */ 3807c478bd9Sstevel@tonic-gate eh->e_shentsize = (Half)elf_fsize(ELF_T_SHDR, 1, ver); 3817c478bd9Sstevel@tonic-gate else 3827c478bd9Sstevel@tonic-gate eh->e_shentsize = 0; 3837c478bd9Sstevel@tonic-gate 3847c478bd9Sstevel@tonic-gate if ((sz = eh->e_shoff + eh->e_shentsize * eh->e_shnum) > hi) 3857c478bd9Sstevel@tonic-gate hi = sz; 3867c478bd9Sstevel@tonic-gate 3877c478bd9Sstevel@tonic-gate #if !(defined(_LP64) && defined(_ELF64)) 3887c478bd9Sstevel@tonic-gate if (hi > INT_MAX) { 3897c478bd9Sstevel@tonic-gate _elf_seterr(EFMT_FBIG, 0); 3907c478bd9Sstevel@tonic-gate return (0); 3917c478bd9Sstevel@tonic-gate } 3927c478bd9Sstevel@tonic-gate #endif 3937c478bd9Sstevel@tonic-gate 3947c478bd9Sstevel@tonic-gate return ((size_t)hi); 3957c478bd9Sstevel@tonic-gate } 3967c478bd9Sstevel@tonic-gate 3977c478bd9Sstevel@tonic-gate 3987c478bd9Sstevel@tonic-gate static size_t 3997c478bd9Sstevel@tonic-gate wrt(Elf * elf, Xword outsz, unsigned fill, int update_cmd) 4007c478bd9Sstevel@tonic-gate { 4017c478bd9Sstevel@tonic-gate NOTE(ASSUMING_PROTECTED(*elf)) 4027c478bd9Sstevel@tonic-gate Elf_Data dst, src; 4037c478bd9Sstevel@tonic-gate unsigned flag; 4047c478bd9Sstevel@tonic-gate Xword hi, sz; 4057c478bd9Sstevel@tonic-gate char *image; 4067c478bd9Sstevel@tonic-gate Elf_Scn *s; 4077c478bd9Sstevel@tonic-gate Ehdr *eh = elf->ed_ehdr; 4087c478bd9Sstevel@tonic-gate unsigned ver = eh->e_version; 409*ba2be530Sab unsigned encode; 4107c478bd9Sstevel@tonic-gate int byte; 4117c478bd9Sstevel@tonic-gate 412*ba2be530Sab /* 413*ba2be530Sab * If this is an ELF_C_WRIMAGE write, then we encode into the 414*ba2be530Sab * byte order of the system we are running on rather than that of 415*ba2be530Sab * of the object. For ld.so.1, this is the same order, but 416*ba2be530Sab * for 'ld', it might not be in the case where we are cross 417*ba2be530Sab * linking an object for a different target. In this later case, 418*ba2be530Sab * the linker-host byte order is necessary so that the linker can 419*ba2be530Sab * manipulate the resulting image. It is expected that the linker 420*ba2be530Sab * will call elf_swap_wrimage() if necessary to convert the image 421*ba2be530Sab * to the target byte order. 422*ba2be530Sab */ 423*ba2be530Sab encode = (update_cmd == ELF_C_WRIMAGE) ? _elf_sys_encoding() : 424*ba2be530Sab eh->e_ident[EI_DATA]; 425*ba2be530Sab 4267c478bd9Sstevel@tonic-gate /* 4277c478bd9Sstevel@tonic-gate * Two issues can cause trouble for the output file. 4287c478bd9Sstevel@tonic-gate * First, begin() with ELF_C_RDWR opens a file for both 4297c478bd9Sstevel@tonic-gate * read and write. On the write update(), the library 4307c478bd9Sstevel@tonic-gate * has to read everything it needs before truncating 4317c478bd9Sstevel@tonic-gate * the file. Second, using mmap for both read and write 4327c478bd9Sstevel@tonic-gate * is too tricky. Consequently, the library disables mmap 4337c478bd9Sstevel@tonic-gate * on the read side. Using mmap for the output saves swap 4347c478bd9Sstevel@tonic-gate * space, because that mapping is SHARED, not PRIVATE. 4357c478bd9Sstevel@tonic-gate * 4367c478bd9Sstevel@tonic-gate * If the file is write-only, there can be nothing of 4377c478bd9Sstevel@tonic-gate * interest to bother with. 4387c478bd9Sstevel@tonic-gate * 4397c478bd9Sstevel@tonic-gate * The following reads the entire file, which might be 4407c478bd9Sstevel@tonic-gate * more than necessary. Better safe than sorry. 4417c478bd9Sstevel@tonic-gate */ 4427c478bd9Sstevel@tonic-gate 4437c478bd9Sstevel@tonic-gate if ((elf->ed_myflags & EDF_READ) && 4447c478bd9Sstevel@tonic-gate (_elf_vm(elf, (size_t)0, elf->ed_fsz) != OK_YES)) 4457c478bd9Sstevel@tonic-gate return (0); 4467c478bd9Sstevel@tonic-gate 4477c478bd9Sstevel@tonic-gate flag = elf->ed_myflags & EDF_WRALLOC; 4487c478bd9Sstevel@tonic-gate if ((image = _elf_outmap(elf->ed_fd, outsz, &flag)) == 0) 4497c478bd9Sstevel@tonic-gate return (0); 4507c478bd9Sstevel@tonic-gate 4517c478bd9Sstevel@tonic-gate if (flag == 0) 4527c478bd9Sstevel@tonic-gate elf->ed_myflags |= EDF_IMALLOC; 4537c478bd9Sstevel@tonic-gate 4547c478bd9Sstevel@tonic-gate /* 4557c478bd9Sstevel@tonic-gate * If an error occurs below, a "dirty" bit may be cleared 4567c478bd9Sstevel@tonic-gate * improperly. To save a second pass through the file, 4577c478bd9Sstevel@tonic-gate * this code sets the dirty bit on the elf descriptor 4587c478bd9Sstevel@tonic-gate * when an error happens, assuming that will "cover" any 4597c478bd9Sstevel@tonic-gate * accidents. 4607c478bd9Sstevel@tonic-gate */ 4617c478bd9Sstevel@tonic-gate 4627c478bd9Sstevel@tonic-gate /* 4637c478bd9Sstevel@tonic-gate * Hi is needed only when 'fill' is non-zero. 4647c478bd9Sstevel@tonic-gate * Fill is non-zero only when the library 4657c478bd9Sstevel@tonic-gate * calculates file/section/data buffer offsets. 4667c478bd9Sstevel@tonic-gate * The lib guarantees they increase monotonically. 4677c478bd9Sstevel@tonic-gate * That guarantees proper filling below. 4687c478bd9Sstevel@tonic-gate */ 4697c478bd9Sstevel@tonic-gate 4707c478bd9Sstevel@tonic-gate 4717c478bd9Sstevel@tonic-gate /* 4727c478bd9Sstevel@tonic-gate * Ehdr first 4737c478bd9Sstevel@tonic-gate */ 4747c478bd9Sstevel@tonic-gate 4757c478bd9Sstevel@tonic-gate src.d_buf = (Elf_Void *)eh; 4767c478bd9Sstevel@tonic-gate src.d_type = ELF_T_EHDR; 4777c478bd9Sstevel@tonic-gate src.d_size = sizeof (Ehdr); 4787c478bd9Sstevel@tonic-gate src.d_version = EV_CURRENT; 4797c478bd9Sstevel@tonic-gate dst.d_buf = (Elf_Void *)image; 4807c478bd9Sstevel@tonic-gate dst.d_size = eh->e_ehsize; 4817c478bd9Sstevel@tonic-gate dst.d_version = ver; 4827c478bd9Sstevel@tonic-gate if (elf_xlatetof(&dst, &src, encode) == 0) 4837c478bd9Sstevel@tonic-gate return (0); 4847c478bd9Sstevel@tonic-gate elf->ed_ehflags &= ~ELF_F_DIRTY; 4857c478bd9Sstevel@tonic-gate hi = eh->e_ehsize; 4867c478bd9Sstevel@tonic-gate 4877c478bd9Sstevel@tonic-gate /* 4887c478bd9Sstevel@tonic-gate * Phdr table if one exists 4897c478bd9Sstevel@tonic-gate */ 4907c478bd9Sstevel@tonic-gate 4917c478bd9Sstevel@tonic-gate if (eh->e_phnum != 0) { 4927c478bd9Sstevel@tonic-gate unsigned work; 4937c478bd9Sstevel@tonic-gate /* 4947c478bd9Sstevel@tonic-gate * Unlike other library data, phdr table is 4957c478bd9Sstevel@tonic-gate * in the user version. Change src buffer 4967c478bd9Sstevel@tonic-gate * version here, fix it after translation. 4977c478bd9Sstevel@tonic-gate */ 4987c478bd9Sstevel@tonic-gate 4997c478bd9Sstevel@tonic-gate src.d_buf = (Elf_Void *)elf->ed_phdr; 5007c478bd9Sstevel@tonic-gate src.d_type = ELF_T_PHDR; 5017c478bd9Sstevel@tonic-gate src.d_size = elf->ed_phdrsz; 5027c478bd9Sstevel@tonic-gate ELFACCESSDATA(work, _elf_work) 5037c478bd9Sstevel@tonic-gate src.d_version = work; 5047c478bd9Sstevel@tonic-gate dst.d_buf = (Elf_Void *)(image + eh->e_phoff); 5057c478bd9Sstevel@tonic-gate dst.d_size = eh->e_phnum * eh->e_phentsize; 5067c478bd9Sstevel@tonic-gate hi = (Xword)(eh->e_phoff + dst.d_size); 5077c478bd9Sstevel@tonic-gate if (elf_xlatetof(&dst, &src, encode) == 0) { 5087c478bd9Sstevel@tonic-gate elf->ed_uflags |= ELF_F_DIRTY; 5097c478bd9Sstevel@tonic-gate return (0); 5107c478bd9Sstevel@tonic-gate } 5117c478bd9Sstevel@tonic-gate elf->ed_phflags &= ~ELF_F_DIRTY; 5127c478bd9Sstevel@tonic-gate src.d_version = EV_CURRENT; 5137c478bd9Sstevel@tonic-gate } 5147c478bd9Sstevel@tonic-gate 5157c478bd9Sstevel@tonic-gate /* 5167c478bd9Sstevel@tonic-gate * Loop through sections 5177c478bd9Sstevel@tonic-gate */ 5187c478bd9Sstevel@tonic-gate 5197c478bd9Sstevel@tonic-gate ELFACCESSDATA(byte, _elf_byte); 5207c478bd9Sstevel@tonic-gate for (s = elf->ed_hdscn; s != 0; s = s->s_next) { 5217c478bd9Sstevel@tonic-gate register Dnode *d, *prevd; 5227c478bd9Sstevel@tonic-gate Xword off = 0; 5237c478bd9Sstevel@tonic-gate Shdr *sh = s->s_shdr; 5247c478bd9Sstevel@tonic-gate char *start = image + sh->sh_offset; 5257c478bd9Sstevel@tonic-gate char *here; 5267c478bd9Sstevel@tonic-gate 5277c478bd9Sstevel@tonic-gate /* 5287c478bd9Sstevel@tonic-gate * Just "clean" DIRTY flag for "empty" sections. Even if 5297c478bd9Sstevel@tonic-gate * NOBITS needs padding, the next thing in the 5307c478bd9Sstevel@tonic-gate * file will provide it. (And if this NOBITS is 5317c478bd9Sstevel@tonic-gate * the last thing in the file, no padding needed.) 5327c478bd9Sstevel@tonic-gate */ 5337c478bd9Sstevel@tonic-gate if ((sh->sh_type == SHT_NOBITS) || 5347c478bd9Sstevel@tonic-gate (sh->sh_type == SHT_NULL)) { 5357c478bd9Sstevel@tonic-gate d = s->s_hdnode, prevd = 0; 5367c478bd9Sstevel@tonic-gate for (; d != 0; prevd = d, d = d->db_next) 5377c478bd9Sstevel@tonic-gate d->db_uflags &= ~ELF_F_DIRTY; 5387c478bd9Sstevel@tonic-gate continue; 5397c478bd9Sstevel@tonic-gate } 5407c478bd9Sstevel@tonic-gate /* 5417c478bd9Sstevel@tonic-gate * Clear out the memory between the end of the last 5427c478bd9Sstevel@tonic-gate * section and the begining of this section. 5437c478bd9Sstevel@tonic-gate */ 5447c478bd9Sstevel@tonic-gate if (fill && (sh->sh_offset > hi)) { 5457c478bd9Sstevel@tonic-gate sz = sh->sh_offset - hi; 5467c478bd9Sstevel@tonic-gate (void) memset(start - sz, byte, sz); 5477c478bd9Sstevel@tonic-gate } 5487c478bd9Sstevel@tonic-gate 5497c478bd9Sstevel@tonic-gate 5507c478bd9Sstevel@tonic-gate for (d = s->s_hdnode, prevd = 0; 5517c478bd9Sstevel@tonic-gate d != 0; prevd = d, d = d->db_next) { 5527c478bd9Sstevel@tonic-gate d->db_uflags &= ~ELF_F_DIRTY; 5537c478bd9Sstevel@tonic-gate here = start + d->db_data.d_off; 5547c478bd9Sstevel@tonic-gate 5557c478bd9Sstevel@tonic-gate /* 5567c478bd9Sstevel@tonic-gate * Clear out the memory between the end of the 5577c478bd9Sstevel@tonic-gate * last update and the start of this data buffer. 5587c478bd9Sstevel@tonic-gate */ 5597c478bd9Sstevel@tonic-gate if (fill && (d->db_data.d_off > off)) { 5607c478bd9Sstevel@tonic-gate sz = (Xword)(d->db_data.d_off - off); 5617c478bd9Sstevel@tonic-gate (void) memset(here - sz, byte, sz); 5627c478bd9Sstevel@tonic-gate } 5637c478bd9Sstevel@tonic-gate 5647c478bd9Sstevel@tonic-gate if ((d->db_myflags & DBF_READY) == 0) { 5657c478bd9Sstevel@tonic-gate SCNLOCK(s); 5667c478bd9Sstevel@tonic-gate if (_elf_locked_getdata(s, &prevd->db_data) != 5677c478bd9Sstevel@tonic-gate &d->db_data) { 5687c478bd9Sstevel@tonic-gate elf->ed_uflags |= ELF_F_DIRTY; 5697c478bd9Sstevel@tonic-gate SCNUNLOCK(s); 5707c478bd9Sstevel@tonic-gate return (0); 5717c478bd9Sstevel@tonic-gate } 5727c478bd9Sstevel@tonic-gate SCNUNLOCK(s); 5737c478bd9Sstevel@tonic-gate } 5747c478bd9Sstevel@tonic-gate dst.d_buf = (Elf_Void *)here; 5757c478bd9Sstevel@tonic-gate dst.d_size = d->db_osz; 5767c478bd9Sstevel@tonic-gate 5777c478bd9Sstevel@tonic-gate /* 5787c478bd9Sstevel@tonic-gate * Copy the translated bits out to the destination 5797c478bd9Sstevel@tonic-gate * image. 5807c478bd9Sstevel@tonic-gate */ 5817c478bd9Sstevel@tonic-gate if (elf_xlatetof(&dst, &d->db_data, encode) == 0) { 5827c478bd9Sstevel@tonic-gate elf->ed_uflags |= ELF_F_DIRTY; 5837c478bd9Sstevel@tonic-gate return (0); 5847c478bd9Sstevel@tonic-gate } 5857c478bd9Sstevel@tonic-gate 5867c478bd9Sstevel@tonic-gate off = (Xword)(d->db_data.d_off + dst.d_size); 5877c478bd9Sstevel@tonic-gate } 5887c478bd9Sstevel@tonic-gate hi = sh->sh_offset + sh->sh_size; 5897c478bd9Sstevel@tonic-gate } 5907c478bd9Sstevel@tonic-gate 5917c478bd9Sstevel@tonic-gate /* 5927c478bd9Sstevel@tonic-gate * Shdr table last 5937c478bd9Sstevel@tonic-gate */ 5947c478bd9Sstevel@tonic-gate 5957c478bd9Sstevel@tonic-gate if (fill && (eh->e_shoff > hi)) { 5967c478bd9Sstevel@tonic-gate sz = eh->e_shoff - hi; 5977c478bd9Sstevel@tonic-gate (void) memset(image + hi, byte, sz); 5987c478bd9Sstevel@tonic-gate } 5997c478bd9Sstevel@tonic-gate 6007c478bd9Sstevel@tonic-gate src.d_type = ELF_T_SHDR; 6017c478bd9Sstevel@tonic-gate src.d_size = sizeof (Shdr); 6027c478bd9Sstevel@tonic-gate dst.d_buf = (Elf_Void *)(image + eh->e_shoff); 6037c478bd9Sstevel@tonic-gate dst.d_size = eh->e_shentsize; 6047c478bd9Sstevel@tonic-gate for (s = elf->ed_hdscn; s != 0; s = s->s_next) { 6057c478bd9Sstevel@tonic-gate assert((uintptr_t)dst.d_buf < ((uintptr_t)image + outsz)); 6067c478bd9Sstevel@tonic-gate s->s_shflags &= ~ELF_F_DIRTY; 6077c478bd9Sstevel@tonic-gate s->s_uflags &= ~ELF_F_DIRTY; 6087c478bd9Sstevel@tonic-gate src.d_buf = s->s_shdr; 6097c478bd9Sstevel@tonic-gate 6107c478bd9Sstevel@tonic-gate if (elf_xlatetof(&dst, &src, encode) == 0) { 6117c478bd9Sstevel@tonic-gate elf->ed_uflags |= ELF_F_DIRTY; 6127c478bd9Sstevel@tonic-gate return (0); 6137c478bd9Sstevel@tonic-gate } 6147c478bd9Sstevel@tonic-gate 6157c478bd9Sstevel@tonic-gate dst.d_buf = (char *)dst.d_buf + eh->e_shentsize; 6167c478bd9Sstevel@tonic-gate } 6177c478bd9Sstevel@tonic-gate /* 6187c478bd9Sstevel@tonic-gate * ELF_C_WRIMAGE signifyes that we build the memory image, but 6197c478bd9Sstevel@tonic-gate * that we do not actually write it to disk. This is used 6207c478bd9Sstevel@tonic-gate * by ld(1) to build up a full image of an elf file and then 6217c478bd9Sstevel@tonic-gate * to process the file before it's actually written out to 6227c478bd9Sstevel@tonic-gate * disk. This saves ld(1) the overhead of having to write 6237c478bd9Sstevel@tonic-gate * the image out to disk twice. 6247c478bd9Sstevel@tonic-gate */ 6257c478bd9Sstevel@tonic-gate if (update_cmd == ELF_C_WRIMAGE) { 6267c478bd9Sstevel@tonic-gate elf->ed_uflags &= ~ELF_F_DIRTY; 6277c478bd9Sstevel@tonic-gate elf->ed_wrimage = image; 6287c478bd9Sstevel@tonic-gate elf->ed_wrimagesz = outsz; 6297c478bd9Sstevel@tonic-gate return (outsz); 6307c478bd9Sstevel@tonic-gate } 6317c478bd9Sstevel@tonic-gate 6327c478bd9Sstevel@tonic-gate if (_elf_outsync(elf->ed_fd, image, outsz, 6337c478bd9Sstevel@tonic-gate ((elf->ed_myflags & EDF_IMALLOC) ? 0 : 1)) != 0) { 6347c478bd9Sstevel@tonic-gate elf->ed_uflags &= ~ELF_F_DIRTY; 6357c478bd9Sstevel@tonic-gate elf->ed_myflags &= ~EDF_IMALLOC; 6367c478bd9Sstevel@tonic-gate return (outsz); 6377c478bd9Sstevel@tonic-gate } 6387c478bd9Sstevel@tonic-gate 6397c478bd9Sstevel@tonic-gate elf->ed_uflags |= ELF_F_DIRTY; 6407c478bd9Sstevel@tonic-gate return (0); 6417c478bd9Sstevel@tonic-gate } 6427c478bd9Sstevel@tonic-gate 6437c478bd9Sstevel@tonic-gate 6447c478bd9Sstevel@tonic-gate 6457c478bd9Sstevel@tonic-gate 6467c478bd9Sstevel@tonic-gate /* 6477c478bd9Sstevel@tonic-gate * The following is a private interface between the linkers (ld & ld.so.1) 6487c478bd9Sstevel@tonic-gate * and libelf: 6497c478bd9Sstevel@tonic-gate * 6507c478bd9Sstevel@tonic-gate * elf_update(elf, ELF_C_WRIMAGE) 6517c478bd9Sstevel@tonic-gate * This will cause full image representing the elf file 6527c478bd9Sstevel@tonic-gate * described by the elf pointer to be built in memory. If the 6537c478bd9Sstevel@tonic-gate * elf pointer has a valid file descriptor associated with it 6547c478bd9Sstevel@tonic-gate * we will attempt to build the memory image from mmap()'ed 6557c478bd9Sstevel@tonic-gate * storage. If the elf descriptor does not have a valid 6567c478bd9Sstevel@tonic-gate * file descriptor (opened with elf_begin(0, ELF_C_IMAGE, 0)) 6577c478bd9Sstevel@tonic-gate * then the image will be allocated from dynamic memory (malloc()). 6587c478bd9Sstevel@tonic-gate * 6597c478bd9Sstevel@tonic-gate * elf_update() will return the size of the memory image built 6607c478bd9Sstevel@tonic-gate * when sucessful. 6617c478bd9Sstevel@tonic-gate * 6627c478bd9Sstevel@tonic-gate * When a subsequent call to elf_update() with ELF_C_WRITE as 6637c478bd9Sstevel@tonic-gate * the command is performed it will sync the image created 6647c478bd9Sstevel@tonic-gate * by ELF_C_WRIMAGE to disk (if fd available) and 6657c478bd9Sstevel@tonic-gate * free the memory allocated. 6667c478bd9Sstevel@tonic-gate */ 6677c478bd9Sstevel@tonic-gate 6687c478bd9Sstevel@tonic-gate off_t 6697c478bd9Sstevel@tonic-gate _elfxx_update(Elf * elf, Elf_Cmd cmd) 6707c478bd9Sstevel@tonic-gate { 6717c478bd9Sstevel@tonic-gate size_t sz; 6727c478bd9Sstevel@tonic-gate unsigned u; 6737c478bd9Sstevel@tonic-gate Ehdr *eh = elf->ed_ehdr; 6747c478bd9Sstevel@tonic-gate 6757c478bd9Sstevel@tonic-gate if (elf == 0) 6767c478bd9Sstevel@tonic-gate return (-1); 6777c478bd9Sstevel@tonic-gate 6787c478bd9Sstevel@tonic-gate ELFWLOCK(elf) 6797c478bd9Sstevel@tonic-gate switch (cmd) { 6807c478bd9Sstevel@tonic-gate default: 6817c478bd9Sstevel@tonic-gate _elf_seterr(EREQ_UPDATE, 0); 6827c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 6837c478bd9Sstevel@tonic-gate return (-1); 6847c478bd9Sstevel@tonic-gate 6857c478bd9Sstevel@tonic-gate case ELF_C_WRIMAGE: 6867c478bd9Sstevel@tonic-gate if ((elf->ed_myflags & EDF_WRITE) == 0) { 6877c478bd9Sstevel@tonic-gate _elf_seterr(EREQ_UPDWRT, 0); 6887c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 6897c478bd9Sstevel@tonic-gate return (-1); 6907c478bd9Sstevel@tonic-gate } 6917c478bd9Sstevel@tonic-gate break; 6927c478bd9Sstevel@tonic-gate case ELF_C_WRITE: 6937c478bd9Sstevel@tonic-gate if ((elf->ed_myflags & EDF_WRITE) == 0) { 6947c478bd9Sstevel@tonic-gate _elf_seterr(EREQ_UPDWRT, 0); 6957c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 6967c478bd9Sstevel@tonic-gate return (-1); 6977c478bd9Sstevel@tonic-gate } 6987c478bd9Sstevel@tonic-gate if (elf->ed_wrimage) { 6997c478bd9Sstevel@tonic-gate if (elf->ed_myflags & EDF_WRALLOC) { 7007c478bd9Sstevel@tonic-gate free(elf->ed_wrimage); 7017c478bd9Sstevel@tonic-gate /* 7027c478bd9Sstevel@tonic-gate * The size is still returned even 7037c478bd9Sstevel@tonic-gate * though nothing is actually written 7047c478bd9Sstevel@tonic-gate * out. This is just to be consistant 7057c478bd9Sstevel@tonic-gate * with the rest of the interface. 7067c478bd9Sstevel@tonic-gate */ 7077c478bd9Sstevel@tonic-gate sz = elf->ed_wrimagesz; 7087c478bd9Sstevel@tonic-gate elf->ed_wrimage = 0; 7097c478bd9Sstevel@tonic-gate elf->ed_wrimagesz = 0; 7107c478bd9Sstevel@tonic-gate ELFUNLOCK(elf); 7117c478bd9Sstevel@tonic-gate return ((off_t)sz); 7127c478bd9Sstevel@tonic-gate } 7137c478bd9Sstevel@tonic-gate sz = _elf_outsync(elf->ed_fd, elf->ed_wrimage, 714*ba2be530Sab elf->ed_wrimagesz, 715*ba2be530Sab (elf->ed_myflags & EDF_IMALLOC ? 0 : 1)); 7167c478bd9Sstevel@tonic-gate elf->ed_myflags &= ~EDF_IMALLOC; 7177c478bd9Sstevel@tonic-gate elf->ed_wrimage = 0; 7187c478bd9Sstevel@tonic-gate elf->ed_wrimagesz = 0; 7197c478bd9Sstevel@tonic-gate ELFUNLOCK(elf); 7207c478bd9Sstevel@tonic-gate return ((off_t)sz); 7217c478bd9Sstevel@tonic-gate } 7227c478bd9Sstevel@tonic-gate /* FALLTHROUGH */ 7237c478bd9Sstevel@tonic-gate case ELF_C_NULL: 7247c478bd9Sstevel@tonic-gate break; 7257c478bd9Sstevel@tonic-gate } 7267c478bd9Sstevel@tonic-gate 7277c478bd9Sstevel@tonic-gate if (eh == 0) { 7287c478bd9Sstevel@tonic-gate _elf_seterr(ESEQ_EHDR, 0); 7297c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 7307c478bd9Sstevel@tonic-gate return (-1); 7317c478bd9Sstevel@tonic-gate } 7327c478bd9Sstevel@tonic-gate 7337c478bd9Sstevel@tonic-gate if ((u = eh->e_version) > EV_CURRENT) { 7347c478bd9Sstevel@tonic-gate _elf_seterr(EREQ_VER, 0); 7357c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 7367c478bd9Sstevel@tonic-gate return (-1); 7377c478bd9Sstevel@tonic-gate } 7387c478bd9Sstevel@tonic-gate 7397c478bd9Sstevel@tonic-gate if (u == EV_NONE) 7407c478bd9Sstevel@tonic-gate eh->e_version = EV_CURRENT; 7417c478bd9Sstevel@tonic-gate 7427c478bd9Sstevel@tonic-gate if ((u = eh->e_ident[EI_DATA]) == ELFDATANONE) { 7437c478bd9Sstevel@tonic-gate unsigned encode; 7447c478bd9Sstevel@tonic-gate 7457c478bd9Sstevel@tonic-gate ELFACCESSDATA(encode, _elf_encode) 7467c478bd9Sstevel@tonic-gate if (encode == ELFDATANONE) { 7477c478bd9Sstevel@tonic-gate _elf_seterr(EREQ_ENCODE, 0); 7487c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 7497c478bd9Sstevel@tonic-gate return (-1); 7507c478bd9Sstevel@tonic-gate } 7517c478bd9Sstevel@tonic-gate /* LINTED */ 7527c478bd9Sstevel@tonic-gate eh->e_ident[EI_DATA] = (Byte)encode; 7537c478bd9Sstevel@tonic-gate } 7547c478bd9Sstevel@tonic-gate 7557c478bd9Sstevel@tonic-gate u = 1; 7567c478bd9Sstevel@tonic-gate if (elf->ed_uflags & ELF_F_LAYOUT) { 7577c478bd9Sstevel@tonic-gate sz = _elf_upd_usr(elf); 7587c478bd9Sstevel@tonic-gate u = 0; 7597c478bd9Sstevel@tonic-gate } else 7607c478bd9Sstevel@tonic-gate sz = _elf_upd_lib(elf); 7617c478bd9Sstevel@tonic-gate 7627c478bd9Sstevel@tonic-gate if ((sz != 0) && ((cmd == ELF_C_WRITE) || (cmd == ELF_C_WRIMAGE))) 7637c478bd9Sstevel@tonic-gate sz = wrt(elf, (Xword)sz, u, cmd); 7647c478bd9Sstevel@tonic-gate 7657c478bd9Sstevel@tonic-gate if (sz == 0) { 7667c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 7677c478bd9Sstevel@tonic-gate return (-1); 7687c478bd9Sstevel@tonic-gate } 7697c478bd9Sstevel@tonic-gate 7707c478bd9Sstevel@tonic-gate ELFUNLOCK(elf) 7717c478bd9Sstevel@tonic-gate return ((off_t)sz); 7727c478bd9Sstevel@tonic-gate } 7737c478bd9Sstevel@tonic-gate 7747c478bd9Sstevel@tonic-gate 775*ba2be530Sab /* 776*ba2be530Sab * When wrt() processes an ELF_C_WRIMAGE request, the resulting image 777*ba2be530Sab * gets the byte order (encoding) of the platform running the linker 778*ba2be530Sab * rather than that of the target host. This allows the linker to modify 779*ba2be530Sab * the image, prior to flushing it to the output file. This routine 780*ba2be530Sab * is used to re-translate such an image into the byte order of the 781*ba2be530Sab * target host. 782*ba2be530Sab */ 783*ba2be530Sab int 784*ba2be530Sab _elfxx_swap_wrimage(Elf * elf) 785*ba2be530Sab { 786*ba2be530Sab NOTE(ASSUMING_PROTECTED(*elf)) 787*ba2be530Sab Elf_Data dst, src; 788*ba2be530Sab Elf_Scn *s; 789*ba2be530Sab Ehdr *eh = elf->ed_ehdr; 790*ba2be530Sab Half e_phnum = eh->e_phnum; 791*ba2be530Sab unsigned ver = eh->e_version; 792*ba2be530Sab unsigned encode = eh->e_ident[EI_DATA]; 793*ba2be530Sab 794*ba2be530Sab /* 795*ba2be530Sab * Ehdr first 796*ba2be530Sab */ 797*ba2be530Sab 798*ba2be530Sab src.d_buf = dst.d_buf = (Elf_Void *)eh; 799*ba2be530Sab src.d_type = dst.d_type = ELF_T_EHDR; 800*ba2be530Sab src.d_size = dst.d_size = sizeof (Ehdr); 801*ba2be530Sab src.d_version = dst.d_version = ver; 802*ba2be530Sab if (elf_xlatetof(&dst, &src, encode) == 0) 803*ba2be530Sab return (1); 804*ba2be530Sab 805*ba2be530Sab /* 806*ba2be530Sab * Phdr table if one exists 807*ba2be530Sab */ 808*ba2be530Sab 809*ba2be530Sab if (e_phnum != 0) { 810*ba2be530Sab unsigned work; 811*ba2be530Sab /* 812*ba2be530Sab * Unlike other library data, phdr table is 813*ba2be530Sab * in the user version. 814*ba2be530Sab */ 815*ba2be530Sab 816*ba2be530Sab src.d_buf = dst.d_buf = (Elf_Void *)elf->ed_phdr; 817*ba2be530Sab src.d_type = dst.d_type = ELF_T_PHDR; 818*ba2be530Sab src.d_size = dst.d_size = elf->ed_phdrsz; 819*ba2be530Sab ELFACCESSDATA(work, _elf_work) 820*ba2be530Sab src.d_version = dst.d_version = work; 821*ba2be530Sab if (elf_xlatetof(&dst, &src, encode) == 0) { 822*ba2be530Sab return (1); 823*ba2be530Sab } 824*ba2be530Sab } 825*ba2be530Sab 826*ba2be530Sab /* 827*ba2be530Sab * Loop through sections 828*ba2be530Sab */ 829*ba2be530Sab 830*ba2be530Sab for (s = elf->ed_hdscn; s != 0; s = s->s_next) { 831*ba2be530Sab register Dnode *d, *prevd; 832*ba2be530Sab Shdr *sh = s->s_shdr; 833*ba2be530Sab 834*ba2be530Sab if ((sh->sh_type == SHT_NOBITS) || (sh->sh_type == SHT_NULL)) 835*ba2be530Sab continue; 836*ba2be530Sab 837*ba2be530Sab for (d = s->s_hdnode, prevd = 0; 838*ba2be530Sab d != 0; prevd = d, d = d->db_next) { 839*ba2be530Sab 840*ba2be530Sab if ((d->db_myflags & DBF_READY) == 0) { 841*ba2be530Sab SCNLOCK(s); 842*ba2be530Sab if (_elf_locked_getdata(s, &prevd->db_data) != 843*ba2be530Sab &d->db_data) { 844*ba2be530Sab SCNUNLOCK(s); 845*ba2be530Sab return (1); 846*ba2be530Sab } 847*ba2be530Sab SCNUNLOCK(s); 848*ba2be530Sab } 849*ba2be530Sab 850*ba2be530Sab dst = d->db_data; 851*ba2be530Sab if (elf_xlatetof(&dst, &d->db_data, encode) == 0) 852*ba2be530Sab return (1); 853*ba2be530Sab } 854*ba2be530Sab } 855*ba2be530Sab 856*ba2be530Sab /* 857*ba2be530Sab * Shdr table 858*ba2be530Sab */ 859*ba2be530Sab 860*ba2be530Sab src.d_type = dst.d_type = ELF_T_SHDR; 861*ba2be530Sab src.d_version = dst.d_version = ver; 862*ba2be530Sab for (s = elf->ed_hdscn; s != 0; s = s->s_next) { 863*ba2be530Sab src.d_buf = dst.d_buf = s->s_shdr; 864*ba2be530Sab src.d_size = dst.d_size = sizeof (Shdr); 865*ba2be530Sab if (elf_xlatetof(&dst, &src, encode) == 0) 866*ba2be530Sab return (1); 867*ba2be530Sab } 868*ba2be530Sab 869*ba2be530Sab return (0); 870*ba2be530Sab } 871*ba2be530Sab 872*ba2be530Sab 873*ba2be530Sab 8747c478bd9Sstevel@tonic-gate #ifndef _ELF64 8757c478bd9Sstevel@tonic-gate /* class-independent, only needs to be compiled once */ 8767c478bd9Sstevel@tonic-gate 8777c478bd9Sstevel@tonic-gate off_t 8787c478bd9Sstevel@tonic-gate elf_update(Elf *elf, Elf_Cmd cmd) 8797c478bd9Sstevel@tonic-gate { 8807c478bd9Sstevel@tonic-gate if (elf == 0) 8817c478bd9Sstevel@tonic-gate return (-1); 8827c478bd9Sstevel@tonic-gate 8837c478bd9Sstevel@tonic-gate if (elf->ed_class == ELFCLASS32) 8847c478bd9Sstevel@tonic-gate return (_elf32_update(elf, cmd)); 8857c478bd9Sstevel@tonic-gate else if (elf->ed_class == ELFCLASS64) { 8867c478bd9Sstevel@tonic-gate return (_elf64_update(elf, cmd)); 8877c478bd9Sstevel@tonic-gate } 8887c478bd9Sstevel@tonic-gate 8897c478bd9Sstevel@tonic-gate _elf_seterr(EREQ_CLASS, 0); 8907c478bd9Sstevel@tonic-gate return (-1); 8917c478bd9Sstevel@tonic-gate } 8927c478bd9Sstevel@tonic-gate 893*ba2be530Sab int 894*ba2be530Sab _elf_swap_wrimage(Elf *elf) 895*ba2be530Sab { 896*ba2be530Sab if (elf == 0) 897*ba2be530Sab return (0); 898*ba2be530Sab 899*ba2be530Sab if (elf->ed_class == ELFCLASS32) 900*ba2be530Sab return (_elf32_swap_wrimage(elf)); 901*ba2be530Sab 902*ba2be530Sab if (elf->ed_class == ELFCLASS64) 903*ba2be530Sab return (_elf64_swap_wrimage(elf)); 904*ba2be530Sab 905*ba2be530Sab _elf_seterr(EREQ_CLASS, 0); 906*ba2be530Sab return (0); 907*ba2be530Sab } 908*ba2be530Sab 9097c478bd9Sstevel@tonic-gate /* 9107c478bd9Sstevel@tonic-gate * 4106312, 4106398, This is an ad-hoc means for the 32-bit 9117c478bd9Sstevel@tonic-gate * Elf64 version of libld.so.3 to get around the limitation 9127c478bd9Sstevel@tonic-gate * of a 32-bit d_off field. This is only intended to be 9137c478bd9Sstevel@tonic-gate * used by libld to relocate symbols in large NOBITS sections. 9147c478bd9Sstevel@tonic-gate */ 9157c478bd9Sstevel@tonic-gate Elf64_Off 9167c478bd9Sstevel@tonic-gate _elf_getxoff(Elf_Data * d) 9177c478bd9Sstevel@tonic-gate { 9187c478bd9Sstevel@tonic-gate return (((Dnode *)d)->db_xoff); 9197c478bd9Sstevel@tonic-gate } 9207c478bd9Sstevel@tonic-gate #endif /* !_ELF64 */ 921