xref: /illumos-gate/usr/src/cmd/sgs/libelf/common/update.c (revision 0bc07c75)
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
5*0bc07c75Srie  * Common Development and Distribution License (the "License").
6*0bc07c75Srie  * 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 /*
23*0bc07c75Srie  *	Copyright (c) 1988 AT&T
24*0bc07c75Srie  *	  All Rights Reserved
25*0bc07c75Srie  *
26*0bc07c75Srie  *
27*0bc07c75Srie  * Copyright 2006 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
697c478bd9Sstevel@tonic-gate 
707c478bd9Sstevel@tonic-gate #else	/* ELF32 */
717c478bd9Sstevel@tonic-gate 
727c478bd9Sstevel@tonic-gate #define	FSZ_LONG	ELF32_FSZ_WORD
737c478bd9Sstevel@tonic-gate #define	ELFCLASS	ELFCLASS32
747c478bd9Sstevel@tonic-gate #define	_elf_snode_init	_elf32_snode_init
757c478bd9Sstevel@tonic-gate #define	_elfxx_cookscn	_elf32_cookscn
767c478bd9Sstevel@tonic-gate #define	_elf_upd_lib	_elf32_upd_lib
777c478bd9Sstevel@tonic-gate #define	elf_fsize	elf32_fsize
787c478bd9Sstevel@tonic-gate #define	_elf_entsz	_elf32_entsz
797c478bd9Sstevel@tonic-gate #define	_elf_msize	_elf32_msize
807c478bd9Sstevel@tonic-gate #define	_elf_upd_usr	_elf32_upd_usr
817c478bd9Sstevel@tonic-gate #define	wrt		wrt32
827c478bd9Sstevel@tonic-gate #define	elf_xlatetof	elf32_xlatetof
837c478bd9Sstevel@tonic-gate #define	_elfxx_update	_elf32_update
847c478bd9Sstevel@tonic-gate 
857c478bd9Sstevel@tonic-gate #endif /* ELF64 */
867c478bd9Sstevel@tonic-gate 
877c478bd9Sstevel@tonic-gate 
887c478bd9Sstevel@tonic-gate /*
897c478bd9Sstevel@tonic-gate  * Output file update
907c478bd9Sstevel@tonic-gate  *	These functions walk an Elf structure, update its information,
917c478bd9Sstevel@tonic-gate  *	and optionally write the output file.  Because the application
927c478bd9Sstevel@tonic-gate  *	may control of the output file layout, two upd_... routines
937c478bd9Sstevel@tonic-gate  *	exist.  They're similar but too different to merge cleanly.
947c478bd9Sstevel@tonic-gate  *
957c478bd9Sstevel@tonic-gate  *	The library defines a "dirty" bit to force parts of the file
967c478bd9Sstevel@tonic-gate  *	to be written on update.  These routines ignore the dirty bit
977c478bd9Sstevel@tonic-gate  *	and do everything.  A minimal update routine might be useful
987c478bd9Sstevel@tonic-gate  *	someday.
997c478bd9Sstevel@tonic-gate  */
1007c478bd9Sstevel@tonic-gate 
1017c478bd9Sstevel@tonic-gate static size_t
1027c478bd9Sstevel@tonic-gate _elf_upd_lib(Elf * elf)
1037c478bd9Sstevel@tonic-gate {
1047c478bd9Sstevel@tonic-gate 	NOTE(ASSUMING_PROTECTED(*elf))
1057c478bd9Sstevel@tonic-gate 	Lword		hi;
1067c478bd9Sstevel@tonic-gate 	Lword		hibit;
1077c478bd9Sstevel@tonic-gate 	Elf_Scn *	s;
1087c478bd9Sstevel@tonic-gate 	register Xword	sz;
1097c478bd9Sstevel@tonic-gate 	Ehdr *		eh = elf->ed_ehdr;
1107c478bd9Sstevel@tonic-gate 	unsigned	ver = eh->e_version;
1117c478bd9Sstevel@tonic-gate 	register char	*p = (char *)eh->e_ident;
1127c478bd9Sstevel@tonic-gate 	size_t		scncnt;
1137c478bd9Sstevel@tonic-gate 
1147c478bd9Sstevel@tonic-gate 	/*
1157c478bd9Sstevel@tonic-gate 	 * Ehdr and Phdr table go first
1167c478bd9Sstevel@tonic-gate 	 */
1177c478bd9Sstevel@tonic-gate 	p[EI_MAG0] = ELFMAG0;
1187c478bd9Sstevel@tonic-gate 	p[EI_MAG1] = ELFMAG1;
1197c478bd9Sstevel@tonic-gate 	p[EI_MAG2] = ELFMAG2;
1207c478bd9Sstevel@tonic-gate 	p[EI_MAG3] = ELFMAG3;
1217c478bd9Sstevel@tonic-gate 	p[EI_CLASS] = ELFCLASS;
1227c478bd9Sstevel@tonic-gate 	/* LINTED */
1237c478bd9Sstevel@tonic-gate 	p[EI_VERSION] = (Byte)ver;
1247c478bd9Sstevel@tonic-gate 	hi = elf_fsize(ELF_T_EHDR, 1, ver);
1257c478bd9Sstevel@tonic-gate 	/* LINTED */
1267c478bd9Sstevel@tonic-gate 	eh->e_ehsize = (Half)hi;
1277c478bd9Sstevel@tonic-gate 	if (eh->e_phnum != 0) {
1287c478bd9Sstevel@tonic-gate 		/* LINTED */
1297c478bd9Sstevel@tonic-gate 		eh->e_phentsize = (Half)elf_fsize(ELF_T_PHDR, 1, ver);
1307c478bd9Sstevel@tonic-gate 		/* LINTED */
1317c478bd9Sstevel@tonic-gate 		eh->e_phoff = (Off)hi;
1327c478bd9Sstevel@tonic-gate 		hi += eh->e_phentsize * eh->e_phnum;
1337c478bd9Sstevel@tonic-gate 	} else {
1347c478bd9Sstevel@tonic-gate 		eh->e_phoff = 0;
1357c478bd9Sstevel@tonic-gate 		eh->e_phentsize = 0;
1367c478bd9Sstevel@tonic-gate 	}
1377c478bd9Sstevel@tonic-gate 
1387c478bd9Sstevel@tonic-gate 	/*
139*0bc07c75Srie 	 * Obtain the first section header.  Typically, this section has NULL
140*0bc07c75Srie 	 * contents, however in the case of Extended ELF Sections this section
141*0bc07c75Srie 	 * is used to hold an alternative e_shnum, e_shstrndx and e_phnum.
142*0bc07c75Srie 	 * On initial allocation (see _elf_snode) the elements of this section
143*0bc07c75Srie 	 * would have been zeroed.  The e_shnum is initialized later, after the
144*0bc07c75Srie 	 * section header count has been determined.  The e_shstrndx and
145*0bc07c75Srie 	 * e_phnum may have already been initialized by the caller (for example,
146*0bc07c75Srie 	 * gelf_update_shdr() in mcs(1)).
1477c478bd9Sstevel@tonic-gate 	 */
1487c478bd9Sstevel@tonic-gate 	if ((s = elf->ed_hdscn) == 0) {
1497c478bd9Sstevel@tonic-gate 		eh->e_shnum = 0;
1507c478bd9Sstevel@tonic-gate 		scncnt = 0;
1517c478bd9Sstevel@tonic-gate 	} else {
1527c478bd9Sstevel@tonic-gate 		s = s->s_next;
153*0bc07c75Srie 		scncnt = 1;
1547c478bd9Sstevel@tonic-gate 	}
1557c478bd9Sstevel@tonic-gate 
156*0bc07c75Srie 	/*
157*0bc07c75Srie 	 * Loop through sections.  Compute section size before changing hi.
158*0bc07c75Srie 	 * Allow null buffers for NOBITS.
159*0bc07c75Srie 	 */
1607c478bd9Sstevel@tonic-gate 	hibit = 0;
1617c478bd9Sstevel@tonic-gate 	for (; s != 0; s = s->s_next) {
1627c478bd9Sstevel@tonic-gate 		register Dnode	*d;
1637c478bd9Sstevel@tonic-gate 		register Lword	fsz, j;
1647c478bd9Sstevel@tonic-gate 		Shdr *sh = s->s_shdr;
1657c478bd9Sstevel@tonic-gate 
1667c478bd9Sstevel@tonic-gate 		scncnt++;
1677c478bd9Sstevel@tonic-gate 		if (sh->sh_type == SHT_NULL) {
1687c478bd9Sstevel@tonic-gate 			*sh = _elf_snode_init.sb_shdr;
1697c478bd9Sstevel@tonic-gate 			continue;
1707c478bd9Sstevel@tonic-gate 		}
1717c478bd9Sstevel@tonic-gate 
1727c478bd9Sstevel@tonic-gate 		if ((s->s_myflags & SF_READY) == 0)
1737c478bd9Sstevel@tonic-gate 			(void) _elfxx_cookscn(s);
1747c478bd9Sstevel@tonic-gate 
1757c478bd9Sstevel@tonic-gate 		sh->sh_addralign = 1;
1767c478bd9Sstevel@tonic-gate 		if ((sz = (Xword)_elf_entsz(sh->sh_type, ver)) != 0)
1777c478bd9Sstevel@tonic-gate 			/* LINTED */
1787c478bd9Sstevel@tonic-gate 			sh->sh_entsize = (Half)sz;
1797c478bd9Sstevel@tonic-gate 		sz = 0;
1807c478bd9Sstevel@tonic-gate 		for (d = s->s_hdnode; d != 0; d = d->db_next) {
1817c478bd9Sstevel@tonic-gate 			if ((fsz = elf_fsize(d->db_data.d_type,
1827c478bd9Sstevel@tonic-gate 			    1, ver)) == 0)
1837c478bd9Sstevel@tonic-gate 				return (0);
1847c478bd9Sstevel@tonic-gate 
1857c478bd9Sstevel@tonic-gate 			j = _elf_msize(d->db_data.d_type, ver);
1867c478bd9Sstevel@tonic-gate 			fsz *= (d->db_data.d_size / j);
1877c478bd9Sstevel@tonic-gate 			d->db_osz = (size_t)fsz;
1887c478bd9Sstevel@tonic-gate 			if ((j = d->db_data.d_align) > 1) {
1897c478bd9Sstevel@tonic-gate 				if (j > sh->sh_addralign)
1907c478bd9Sstevel@tonic-gate 					sh->sh_addralign = (Xword)j;
1917c478bd9Sstevel@tonic-gate 
1927c478bd9Sstevel@tonic-gate 				if (sz % j != 0)
1937c478bd9Sstevel@tonic-gate 					sz += j - sz % j;
1947c478bd9Sstevel@tonic-gate 			}
1957c478bd9Sstevel@tonic-gate 			d->db_data.d_off = (off_t)sz;
1967c478bd9Sstevel@tonic-gate 			d->db_xoff = sz;
1977c478bd9Sstevel@tonic-gate 			sz += (Xword)fsz;
1987c478bd9Sstevel@tonic-gate 		}
1997c478bd9Sstevel@tonic-gate 
2007c478bd9Sstevel@tonic-gate 		sh->sh_size = sz;
2017c478bd9Sstevel@tonic-gate 		/*
2027c478bd9Sstevel@tonic-gate 		 * We want to take into account the offsets for NOBITS
2037c478bd9Sstevel@tonic-gate 		 * sections and let the "sh_offsets" point to where
2047c478bd9Sstevel@tonic-gate 		 * the section would 'conceptually' fit within
2057c478bd9Sstevel@tonic-gate 		 * the file (as required by the ABI).
2067c478bd9Sstevel@tonic-gate 		 *
2077c478bd9Sstevel@tonic-gate 		 * But - we must also make sure that the NOBITS does
2087c478bd9Sstevel@tonic-gate 		 * not take up any actual space in the file.  We preserve
2097c478bd9Sstevel@tonic-gate 		 * the actual offset into the file in the 'hibit' variable.
2107c478bd9Sstevel@tonic-gate 		 * When we come to the first non-NOBITS section after a
2117c478bd9Sstevel@tonic-gate 		 * encountering a NOBITS section the hi counter is restored
2127c478bd9Sstevel@tonic-gate 		 * to its proper place in the file.
2137c478bd9Sstevel@tonic-gate 		 */
2147c478bd9Sstevel@tonic-gate 		if (sh->sh_type == SHT_NOBITS) {
2157c478bd9Sstevel@tonic-gate 			if (hibit == 0)
2167c478bd9Sstevel@tonic-gate 				hibit = hi;
2177c478bd9Sstevel@tonic-gate 		} else {
2187c478bd9Sstevel@tonic-gate 			if (hibit) {
2197c478bd9Sstevel@tonic-gate 				hi = hibit;
2207c478bd9Sstevel@tonic-gate 				hibit = 0;
2217c478bd9Sstevel@tonic-gate 			}
2227c478bd9Sstevel@tonic-gate 		}
2237c478bd9Sstevel@tonic-gate 		j = sh->sh_addralign;
2247c478bd9Sstevel@tonic-gate 		if ((fsz = hi % j) != 0)
2257c478bd9Sstevel@tonic-gate 			hi += j - fsz;
2267c478bd9Sstevel@tonic-gate 
2277c478bd9Sstevel@tonic-gate 		/* LINTED */
2287c478bd9Sstevel@tonic-gate 		sh->sh_offset = (Off)hi;
2297c478bd9Sstevel@tonic-gate 		hi += sz;
2307c478bd9Sstevel@tonic-gate 	}
2317c478bd9Sstevel@tonic-gate 
2327c478bd9Sstevel@tonic-gate 	/*
2337c478bd9Sstevel@tonic-gate 	 * if last section was a 'NOBITS' section then we need to
2347c478bd9Sstevel@tonic-gate 	 * restore the 'hi' counter to point to the end of the last
2357c478bd9Sstevel@tonic-gate 	 * non 'NOBITS' section.
2367c478bd9Sstevel@tonic-gate 	 */
2377c478bd9Sstevel@tonic-gate 	if (hibit) {
2387c478bd9Sstevel@tonic-gate 		hi = hibit;
2397c478bd9Sstevel@tonic-gate 		hibit = 0;
2407c478bd9Sstevel@tonic-gate 	}
2417c478bd9Sstevel@tonic-gate 
2427c478bd9Sstevel@tonic-gate 	/*
2437c478bd9Sstevel@tonic-gate 	 * Shdr table last
2447c478bd9Sstevel@tonic-gate 	 */
2457c478bd9Sstevel@tonic-gate 	if (scncnt != 0) {
2467c478bd9Sstevel@tonic-gate 		if (hi % FSZ_LONG != 0)
2477c478bd9Sstevel@tonic-gate 			hi += FSZ_LONG - hi % FSZ_LONG;
2487c478bd9Sstevel@tonic-gate 		/* LINTED */
2497c478bd9Sstevel@tonic-gate 		eh->e_shoff = (Off)hi;
2507c478bd9Sstevel@tonic-gate 		/*
2517c478bd9Sstevel@tonic-gate 		 * If we are using 'extended sections' then the
2527c478bd9Sstevel@tonic-gate 		 * e_shnum is stored in the sh_size field of the
2537c478bd9Sstevel@tonic-gate 		 * first section header.
2547c478bd9Sstevel@tonic-gate 		 *
2557c478bd9Sstevel@tonic-gate 		 * NOTE: we set e_shnum to '0' because it's specified
2567c478bd9Sstevel@tonic-gate 		 * this way in the gABI, and in the hopes that
2577c478bd9Sstevel@tonic-gate 		 * this will cause less problems to unaware
2587c478bd9Sstevel@tonic-gate 		 * tools then if we'd set it to SHN_XINDEX (0xffff).
2597c478bd9Sstevel@tonic-gate 		 */
2607c478bd9Sstevel@tonic-gate 		if (scncnt < SHN_LORESERVE)
2617c478bd9Sstevel@tonic-gate 			eh->e_shnum = scncnt;
2627c478bd9Sstevel@tonic-gate 		else {
2637c478bd9Sstevel@tonic-gate 			Shdr	*sh;
2647c478bd9Sstevel@tonic-gate 			sh = (Shdr *)elf->ed_hdscn->s_shdr;
2657c478bd9Sstevel@tonic-gate 			sh->sh_size = scncnt;
2667c478bd9Sstevel@tonic-gate 			eh->e_shnum = 0;
2677c478bd9Sstevel@tonic-gate 		}
2687c478bd9Sstevel@tonic-gate 		/* LINTED */
2697c478bd9Sstevel@tonic-gate 		eh->e_shentsize = (Half)elf_fsize(ELF_T_SHDR, 1, ver);
2707c478bd9Sstevel@tonic-gate 		hi += eh->e_shentsize * scncnt;
2717c478bd9Sstevel@tonic-gate 	} else {
2727c478bd9Sstevel@tonic-gate 		eh->e_shoff = 0;
2737c478bd9Sstevel@tonic-gate 		eh->e_shentsize = 0;
2747c478bd9Sstevel@tonic-gate 	}
2757c478bd9Sstevel@tonic-gate 
2767c478bd9Sstevel@tonic-gate #if	!(defined(_LP64) && defined(_ELF64))
2777c478bd9Sstevel@tonic-gate 	if (hi > INT_MAX) {
2787c478bd9Sstevel@tonic-gate 		_elf_seterr(EFMT_FBIG, 0);
2797c478bd9Sstevel@tonic-gate 		return (0);
2807c478bd9Sstevel@tonic-gate 	}
2817c478bd9Sstevel@tonic-gate #endif
2827c478bd9Sstevel@tonic-gate 
2837c478bd9Sstevel@tonic-gate 	return ((size_t)hi);
2847c478bd9Sstevel@tonic-gate }
2857c478bd9Sstevel@tonic-gate 
2867c478bd9Sstevel@tonic-gate 
2877c478bd9Sstevel@tonic-gate 
2887c478bd9Sstevel@tonic-gate static size_t
2897c478bd9Sstevel@tonic-gate _elf_upd_usr(Elf * elf)
2907c478bd9Sstevel@tonic-gate {
2917c478bd9Sstevel@tonic-gate 	NOTE(ASSUMING_PROTECTED(*elf))
2927c478bd9Sstevel@tonic-gate 	Lword		hi;
2937c478bd9Sstevel@tonic-gate 	Elf_Scn *	s;
2947c478bd9Sstevel@tonic-gate 	register Xword	sz;
2957c478bd9Sstevel@tonic-gate 	Ehdr *		eh = elf->ed_ehdr;
2967c478bd9Sstevel@tonic-gate 	unsigned	ver = eh->e_version;
2977c478bd9Sstevel@tonic-gate 	register char	*p = (char *)eh->e_ident;
2987c478bd9Sstevel@tonic-gate 
2997c478bd9Sstevel@tonic-gate 
3007c478bd9Sstevel@tonic-gate 	/*
3017c478bd9Sstevel@tonic-gate 	 * Ehdr and Phdr table go first
3027c478bd9Sstevel@tonic-gate 	 */
3037c478bd9Sstevel@tonic-gate 	p[EI_MAG0] = ELFMAG0;
3047c478bd9Sstevel@tonic-gate 	p[EI_MAG1] = ELFMAG1;
3057c478bd9Sstevel@tonic-gate 	p[EI_MAG2] = ELFMAG2;
3067c478bd9Sstevel@tonic-gate 	p[EI_MAG3] = ELFMAG3;
3077c478bd9Sstevel@tonic-gate 	p[EI_CLASS] = ELFCLASS;
3087c478bd9Sstevel@tonic-gate 	/* LINTED */
3097c478bd9Sstevel@tonic-gate 	p[EI_VERSION] = (Byte)ver;
3107c478bd9Sstevel@tonic-gate 	hi = elf_fsize(ELF_T_EHDR, 1, ver);
3117c478bd9Sstevel@tonic-gate 	/* LINTED */
3127c478bd9Sstevel@tonic-gate 	eh->e_ehsize = (Half)hi;
3137c478bd9Sstevel@tonic-gate 
3147c478bd9Sstevel@tonic-gate 	/*
3157c478bd9Sstevel@tonic-gate 	 * If phnum is zero, phoff "should" be zero too,
3167c478bd9Sstevel@tonic-gate 	 * but the application is responsible for it.
3177c478bd9Sstevel@tonic-gate 	 * Allow a non-zero value here and update the
3187c478bd9Sstevel@tonic-gate 	 * hi water mark accordingly.
3197c478bd9Sstevel@tonic-gate 	 */
3207c478bd9Sstevel@tonic-gate 
3217c478bd9Sstevel@tonic-gate 	if (eh->e_phnum != 0)
3227c478bd9Sstevel@tonic-gate 		/* LINTED */
3237c478bd9Sstevel@tonic-gate 		eh->e_phentsize = (Half)elf_fsize(ELF_T_PHDR, 1, ver);
3247c478bd9Sstevel@tonic-gate 	else
3257c478bd9Sstevel@tonic-gate 		eh->e_phentsize = 0;
3267c478bd9Sstevel@tonic-gate 	if ((sz = eh->e_phoff + eh->e_phentsize * eh->e_phnum) > hi)
3277c478bd9Sstevel@tonic-gate 		hi = sz;
3287c478bd9Sstevel@tonic-gate 
3297c478bd9Sstevel@tonic-gate 	/*
3307c478bd9Sstevel@tonic-gate 	 * Loop through sections, skipping index zero.
3317c478bd9Sstevel@tonic-gate 	 * Compute section size before changing hi.
3327c478bd9Sstevel@tonic-gate 	 * Allow null buffers for NOBITS.
3337c478bd9Sstevel@tonic-gate 	 */
3347c478bd9Sstevel@tonic-gate 
3357c478bd9Sstevel@tonic-gate 	if ((s = elf->ed_hdscn) == 0)
3367c478bd9Sstevel@tonic-gate 		eh->e_shnum = 0;
3377c478bd9Sstevel@tonic-gate 	else {
3387c478bd9Sstevel@tonic-gate 		eh->e_shnum = 1;
3397c478bd9Sstevel@tonic-gate 		*(Shdr*)s->s_shdr = _elf_snode_init.sb_shdr;
3407c478bd9Sstevel@tonic-gate 		s = s->s_next;
3417c478bd9Sstevel@tonic-gate 	}
3427c478bd9Sstevel@tonic-gate 	for (; s != 0; s = s->s_next) {
3437c478bd9Sstevel@tonic-gate 		register Dnode	*d;
3447c478bd9Sstevel@tonic-gate 		register Xword	fsz, j;
3457c478bd9Sstevel@tonic-gate 		Shdr *sh = s->s_shdr;
3467c478bd9Sstevel@tonic-gate 
3477c478bd9Sstevel@tonic-gate 		if ((s->s_myflags & SF_READY) == 0)
3487c478bd9Sstevel@tonic-gate 			(void) _elfxx_cookscn(s);
3497c478bd9Sstevel@tonic-gate 
3507c478bd9Sstevel@tonic-gate 		++eh->e_shnum;
3517c478bd9Sstevel@tonic-gate 		sz = 0;
3527c478bd9Sstevel@tonic-gate 		for (d = s->s_hdnode; d != 0; d = d->db_next) {
3537c478bd9Sstevel@tonic-gate 			if ((fsz = (Xword)elf_fsize(d->db_data.d_type, 1,
3547c478bd9Sstevel@tonic-gate 			    ver)) == 0)
3557c478bd9Sstevel@tonic-gate 				return (0);
3567c478bd9Sstevel@tonic-gate 			j = (Xword)_elf_msize(d->db_data.d_type, ver);
3577c478bd9Sstevel@tonic-gate 			fsz *= (Xword)(d->db_data.d_size / j);
3587c478bd9Sstevel@tonic-gate 			d->db_osz = (size_t)fsz;
3597c478bd9Sstevel@tonic-gate 
3607c478bd9Sstevel@tonic-gate 			if ((sh->sh_type != SHT_NOBITS) &&
3617c478bd9Sstevel@tonic-gate 			((j = (Xword)(d->db_data.d_off + d->db_osz)) > sz))
3627c478bd9Sstevel@tonic-gate 				sz = j;
3637c478bd9Sstevel@tonic-gate 		}
3647c478bd9Sstevel@tonic-gate 		if (sh->sh_size < sz) {
3657c478bd9Sstevel@tonic-gate 			_elf_seterr(EFMT_SCNSZ, 0);
3667c478bd9Sstevel@tonic-gate 			return (0);
3677c478bd9Sstevel@tonic-gate 		}
3687c478bd9Sstevel@tonic-gate 		if ((sh->sh_type != SHT_NOBITS) &&
3697c478bd9Sstevel@tonic-gate 		    (hi < sh->sh_offset + sh->sh_size))
3707c478bd9Sstevel@tonic-gate 			hi = sh->sh_offset + sh->sh_size;
3717c478bd9Sstevel@tonic-gate 	}
3727c478bd9Sstevel@tonic-gate 
3737c478bd9Sstevel@tonic-gate 	/*
3747c478bd9Sstevel@tonic-gate 	 * Shdr table last.  Comment above for phnum/phoff applies here.
3757c478bd9Sstevel@tonic-gate 	 */
3767c478bd9Sstevel@tonic-gate 	if (eh->e_shnum != 0)
3777c478bd9Sstevel@tonic-gate 		/* LINTED */
3787c478bd9Sstevel@tonic-gate 		eh->e_shentsize = (Half)elf_fsize(ELF_T_SHDR, 1, ver);
3797c478bd9Sstevel@tonic-gate 	else
3807c478bd9Sstevel@tonic-gate 		eh->e_shentsize = 0;
3817c478bd9Sstevel@tonic-gate 
3827c478bd9Sstevel@tonic-gate 	if ((sz = eh->e_shoff + eh->e_shentsize * eh->e_shnum) > hi)
3837c478bd9Sstevel@tonic-gate 		hi = sz;
3847c478bd9Sstevel@tonic-gate 
3857c478bd9Sstevel@tonic-gate #if	!(defined(_LP64) && defined(_ELF64))
3867c478bd9Sstevel@tonic-gate 	if (hi > INT_MAX) {
3877c478bd9Sstevel@tonic-gate 		_elf_seterr(EFMT_FBIG, 0);
3887c478bd9Sstevel@tonic-gate 		return (0);
3897c478bd9Sstevel@tonic-gate 	}
3907c478bd9Sstevel@tonic-gate #endif
3917c478bd9Sstevel@tonic-gate 
3927c478bd9Sstevel@tonic-gate 	return ((size_t)hi);
3937c478bd9Sstevel@tonic-gate }
3947c478bd9Sstevel@tonic-gate 
3957c478bd9Sstevel@tonic-gate 
3967c478bd9Sstevel@tonic-gate static size_t
3977c478bd9Sstevel@tonic-gate wrt(Elf * elf, Xword outsz, unsigned fill, int update_cmd)
3987c478bd9Sstevel@tonic-gate {
3997c478bd9Sstevel@tonic-gate 	NOTE(ASSUMING_PROTECTED(*elf))
4007c478bd9Sstevel@tonic-gate 	Elf_Data	dst, src;
4017c478bd9Sstevel@tonic-gate 	unsigned	flag;
4027c478bd9Sstevel@tonic-gate 	Xword		hi, sz;
4037c478bd9Sstevel@tonic-gate 	char		*image;
4047c478bd9Sstevel@tonic-gate 	Elf_Scn		*s;
4057c478bd9Sstevel@tonic-gate 	Ehdr		*eh = elf->ed_ehdr;
4067c478bd9Sstevel@tonic-gate 	unsigned	ver = eh->e_version;
4077c478bd9Sstevel@tonic-gate 	unsigned	encode = eh->e_ident[EI_DATA];
4087c478bd9Sstevel@tonic-gate 	int		byte;
4097c478bd9Sstevel@tonic-gate 
4107c478bd9Sstevel@tonic-gate 	/*
4117c478bd9Sstevel@tonic-gate 	 * Two issues can cause trouble for the output file.
4127c478bd9Sstevel@tonic-gate 	 * First, begin() with ELF_C_RDWR opens a file for both
4137c478bd9Sstevel@tonic-gate 	 * read and write.  On the write update(), the library
4147c478bd9Sstevel@tonic-gate 	 * has to read everything it needs before truncating
4157c478bd9Sstevel@tonic-gate 	 * the file.  Second, using mmap for both read and write
4167c478bd9Sstevel@tonic-gate 	 * is too tricky.  Consequently, the library disables mmap
4177c478bd9Sstevel@tonic-gate 	 * on the read side.  Using mmap for the output saves swap
4187c478bd9Sstevel@tonic-gate 	 * space, because that mapping is SHARED, not PRIVATE.
4197c478bd9Sstevel@tonic-gate 	 *
4207c478bd9Sstevel@tonic-gate 	 * If the file is write-only, there can be nothing of
4217c478bd9Sstevel@tonic-gate 	 * interest to bother with.
4227c478bd9Sstevel@tonic-gate 	 *
4237c478bd9Sstevel@tonic-gate 	 * The following reads the entire file, which might be
4247c478bd9Sstevel@tonic-gate 	 * more than necessary.  Better safe than sorry.
4257c478bd9Sstevel@tonic-gate 	 */
4267c478bd9Sstevel@tonic-gate 
4277c478bd9Sstevel@tonic-gate 	if ((elf->ed_myflags & EDF_READ) &&
4287c478bd9Sstevel@tonic-gate 	    (_elf_vm(elf, (size_t)0, elf->ed_fsz) != OK_YES))
4297c478bd9Sstevel@tonic-gate 		return (0);
4307c478bd9Sstevel@tonic-gate 
4317c478bd9Sstevel@tonic-gate 	flag = elf->ed_myflags & EDF_WRALLOC;
4327c478bd9Sstevel@tonic-gate 	if ((image = _elf_outmap(elf->ed_fd, outsz, &flag)) == 0)
4337c478bd9Sstevel@tonic-gate 		return (0);
4347c478bd9Sstevel@tonic-gate 
4357c478bd9Sstevel@tonic-gate 	if (flag == 0)
4367c478bd9Sstevel@tonic-gate 		elf->ed_myflags |= EDF_IMALLOC;
4377c478bd9Sstevel@tonic-gate 
4387c478bd9Sstevel@tonic-gate 	/*
4397c478bd9Sstevel@tonic-gate 	 * If an error occurs below, a "dirty" bit may be cleared
4407c478bd9Sstevel@tonic-gate 	 * improperly.  To save a second pass through the file,
4417c478bd9Sstevel@tonic-gate 	 * this code sets the dirty bit on the elf descriptor
4427c478bd9Sstevel@tonic-gate 	 * when an error happens, assuming that will "cover" any
4437c478bd9Sstevel@tonic-gate 	 * accidents.
4447c478bd9Sstevel@tonic-gate 	 */
4457c478bd9Sstevel@tonic-gate 
4467c478bd9Sstevel@tonic-gate 	/*
4477c478bd9Sstevel@tonic-gate 	 * Hi is needed only when 'fill' is non-zero.
4487c478bd9Sstevel@tonic-gate 	 * Fill is non-zero only when the library
4497c478bd9Sstevel@tonic-gate 	 * calculates file/section/data buffer offsets.
4507c478bd9Sstevel@tonic-gate 	 * The lib guarantees they increase monotonically.
4517c478bd9Sstevel@tonic-gate 	 * That guarantees proper filling below.
4527c478bd9Sstevel@tonic-gate 	 */
4537c478bd9Sstevel@tonic-gate 
4547c478bd9Sstevel@tonic-gate 
4557c478bd9Sstevel@tonic-gate 	/*
4567c478bd9Sstevel@tonic-gate 	 * Ehdr first
4577c478bd9Sstevel@tonic-gate 	 */
4587c478bd9Sstevel@tonic-gate 
4597c478bd9Sstevel@tonic-gate 	src.d_buf = (Elf_Void *)eh;
4607c478bd9Sstevel@tonic-gate 	src.d_type = ELF_T_EHDR;
4617c478bd9Sstevel@tonic-gate 	src.d_size = sizeof (Ehdr);
4627c478bd9Sstevel@tonic-gate 	src.d_version = EV_CURRENT;
4637c478bd9Sstevel@tonic-gate 	dst.d_buf = (Elf_Void *)image;
4647c478bd9Sstevel@tonic-gate 	dst.d_size = eh->e_ehsize;
4657c478bd9Sstevel@tonic-gate 	dst.d_version = ver;
4667c478bd9Sstevel@tonic-gate 	if (elf_xlatetof(&dst, &src, encode) == 0)
4677c478bd9Sstevel@tonic-gate 		return (0);
4687c478bd9Sstevel@tonic-gate 	elf->ed_ehflags &= ~ELF_F_DIRTY;
4697c478bd9Sstevel@tonic-gate 	hi = eh->e_ehsize;
4707c478bd9Sstevel@tonic-gate 
4717c478bd9Sstevel@tonic-gate 	/*
4727c478bd9Sstevel@tonic-gate 	 * Phdr table if one exists
4737c478bd9Sstevel@tonic-gate 	 */
4747c478bd9Sstevel@tonic-gate 
4757c478bd9Sstevel@tonic-gate 	if (eh->e_phnum != 0) {
4767c478bd9Sstevel@tonic-gate 		unsigned	work;
4777c478bd9Sstevel@tonic-gate 		/*
4787c478bd9Sstevel@tonic-gate 		 * Unlike other library data, phdr table is
4797c478bd9Sstevel@tonic-gate 		 * in the user version.  Change src buffer
4807c478bd9Sstevel@tonic-gate 		 * version here, fix it after translation.
4817c478bd9Sstevel@tonic-gate 		 */
4827c478bd9Sstevel@tonic-gate 
4837c478bd9Sstevel@tonic-gate 		src.d_buf = (Elf_Void *)elf->ed_phdr;
4847c478bd9Sstevel@tonic-gate 		src.d_type = ELF_T_PHDR;
4857c478bd9Sstevel@tonic-gate 		src.d_size = elf->ed_phdrsz;
4867c478bd9Sstevel@tonic-gate 		ELFACCESSDATA(work, _elf_work)
4877c478bd9Sstevel@tonic-gate 		src.d_version = work;
4887c478bd9Sstevel@tonic-gate 		dst.d_buf = (Elf_Void *)(image + eh->e_phoff);
4897c478bd9Sstevel@tonic-gate 		dst.d_size = eh->e_phnum * eh->e_phentsize;
4907c478bd9Sstevel@tonic-gate 		hi = (Xword)(eh->e_phoff + dst.d_size);
4917c478bd9Sstevel@tonic-gate 		if (elf_xlatetof(&dst, &src, encode) == 0) {
4927c478bd9Sstevel@tonic-gate 			elf->ed_uflags |= ELF_F_DIRTY;
4937c478bd9Sstevel@tonic-gate 			return (0);
4947c478bd9Sstevel@tonic-gate 		}
4957c478bd9Sstevel@tonic-gate 		elf->ed_phflags &= ~ELF_F_DIRTY;
4967c478bd9Sstevel@tonic-gate 		src.d_version = EV_CURRENT;
4977c478bd9Sstevel@tonic-gate 	}
4987c478bd9Sstevel@tonic-gate 
4997c478bd9Sstevel@tonic-gate 	/*
5007c478bd9Sstevel@tonic-gate 	 * Loop through sections
5017c478bd9Sstevel@tonic-gate 	 */
5027c478bd9Sstevel@tonic-gate 
5037c478bd9Sstevel@tonic-gate 	ELFACCESSDATA(byte, _elf_byte);
5047c478bd9Sstevel@tonic-gate 	for (s = elf->ed_hdscn; s != 0; s = s->s_next) {
5057c478bd9Sstevel@tonic-gate 		register Dnode	*d, *prevd;
5067c478bd9Sstevel@tonic-gate 		Xword		off = 0;
5077c478bd9Sstevel@tonic-gate 		Shdr		*sh = s->s_shdr;
5087c478bd9Sstevel@tonic-gate 		char		*start = image + sh->sh_offset;
5097c478bd9Sstevel@tonic-gate 		char		*here;
5107c478bd9Sstevel@tonic-gate 
5117c478bd9Sstevel@tonic-gate 		/*
5127c478bd9Sstevel@tonic-gate 		 * Just "clean" DIRTY flag for "empty" sections.  Even if
5137c478bd9Sstevel@tonic-gate 		 * NOBITS needs padding, the next thing in the
5147c478bd9Sstevel@tonic-gate 		 * file will provide it.  (And if this NOBITS is
5157c478bd9Sstevel@tonic-gate 		 * the last thing in the file, no padding needed.)
5167c478bd9Sstevel@tonic-gate 		 */
5177c478bd9Sstevel@tonic-gate 		if ((sh->sh_type == SHT_NOBITS) ||
5187c478bd9Sstevel@tonic-gate 		    (sh->sh_type == SHT_NULL)) {
5197c478bd9Sstevel@tonic-gate 			d = s->s_hdnode, prevd = 0;
5207c478bd9Sstevel@tonic-gate 			for (; d != 0; prevd = d, d = d->db_next)
5217c478bd9Sstevel@tonic-gate 				d->db_uflags &= ~ELF_F_DIRTY;
5227c478bd9Sstevel@tonic-gate 			continue;
5237c478bd9Sstevel@tonic-gate 		}
5247c478bd9Sstevel@tonic-gate 		/*
5257c478bd9Sstevel@tonic-gate 		 * Clear out the memory between the end of the last
5267c478bd9Sstevel@tonic-gate 		 * section and the begining of this section.
5277c478bd9Sstevel@tonic-gate 		 */
5287c478bd9Sstevel@tonic-gate 		if (fill && (sh->sh_offset > hi)) {
5297c478bd9Sstevel@tonic-gate 			sz = sh->sh_offset - hi;
5307c478bd9Sstevel@tonic-gate 			(void) memset(start - sz, byte, sz);
5317c478bd9Sstevel@tonic-gate 		}
5327c478bd9Sstevel@tonic-gate 
5337c478bd9Sstevel@tonic-gate 
5347c478bd9Sstevel@tonic-gate 		for (d = s->s_hdnode, prevd = 0;
5357c478bd9Sstevel@tonic-gate 		    d != 0; prevd = d, d = d->db_next) {
5367c478bd9Sstevel@tonic-gate 			d->db_uflags &= ~ELF_F_DIRTY;
5377c478bd9Sstevel@tonic-gate 			here = start + d->db_data.d_off;
5387c478bd9Sstevel@tonic-gate 
5397c478bd9Sstevel@tonic-gate 			/*
5407c478bd9Sstevel@tonic-gate 			 * Clear out the memory between the end of the
5417c478bd9Sstevel@tonic-gate 			 * last update and the start of this data buffer.
5427c478bd9Sstevel@tonic-gate 			 */
5437c478bd9Sstevel@tonic-gate 			if (fill && (d->db_data.d_off > off)) {
5447c478bd9Sstevel@tonic-gate 				sz = (Xword)(d->db_data.d_off - off);
5457c478bd9Sstevel@tonic-gate 				(void) memset(here - sz, byte, sz);
5467c478bd9Sstevel@tonic-gate 			}
5477c478bd9Sstevel@tonic-gate 
5487c478bd9Sstevel@tonic-gate 			if ((d->db_myflags & DBF_READY) == 0) {
5497c478bd9Sstevel@tonic-gate 				SCNLOCK(s);
5507c478bd9Sstevel@tonic-gate 				if (_elf_locked_getdata(s, &prevd->db_data) !=
5517c478bd9Sstevel@tonic-gate 				    &d->db_data) {
5527c478bd9Sstevel@tonic-gate 					elf->ed_uflags |= ELF_F_DIRTY;
5537c478bd9Sstevel@tonic-gate 					SCNUNLOCK(s);
5547c478bd9Sstevel@tonic-gate 					return (0);
5557c478bd9Sstevel@tonic-gate 				}
5567c478bd9Sstevel@tonic-gate 				SCNUNLOCK(s);
5577c478bd9Sstevel@tonic-gate 			}
5587c478bd9Sstevel@tonic-gate 			dst.d_buf = (Elf_Void *)here;
5597c478bd9Sstevel@tonic-gate 			dst.d_size = d->db_osz;
5607c478bd9Sstevel@tonic-gate 
5617c478bd9Sstevel@tonic-gate 			/*
5627c478bd9Sstevel@tonic-gate 			 * Copy the translated bits out to the destination
5637c478bd9Sstevel@tonic-gate 			 * image.
5647c478bd9Sstevel@tonic-gate 			 */
5657c478bd9Sstevel@tonic-gate 			if (elf_xlatetof(&dst, &d->db_data, encode) == 0) {
5667c478bd9Sstevel@tonic-gate 				elf->ed_uflags |= ELF_F_DIRTY;
5677c478bd9Sstevel@tonic-gate 				return (0);
5687c478bd9Sstevel@tonic-gate 			}
5697c478bd9Sstevel@tonic-gate 
5707c478bd9Sstevel@tonic-gate 			off = (Xword)(d->db_data.d_off + dst.d_size);
5717c478bd9Sstevel@tonic-gate 		}
5727c478bd9Sstevel@tonic-gate 		hi = sh->sh_offset + sh->sh_size;
5737c478bd9Sstevel@tonic-gate 	}
5747c478bd9Sstevel@tonic-gate 
5757c478bd9Sstevel@tonic-gate 	/*
5767c478bd9Sstevel@tonic-gate 	 * Shdr table last
5777c478bd9Sstevel@tonic-gate 	 */
5787c478bd9Sstevel@tonic-gate 
5797c478bd9Sstevel@tonic-gate 	if (fill && (eh->e_shoff > hi)) {
5807c478bd9Sstevel@tonic-gate 		sz = eh->e_shoff - hi;
5817c478bd9Sstevel@tonic-gate 		(void) memset(image + hi, byte, sz);
5827c478bd9Sstevel@tonic-gate 	}
5837c478bd9Sstevel@tonic-gate 
5847c478bd9Sstevel@tonic-gate 	src.d_type = ELF_T_SHDR;
5857c478bd9Sstevel@tonic-gate 	src.d_size = sizeof (Shdr);
5867c478bd9Sstevel@tonic-gate 	dst.d_buf = (Elf_Void *)(image + eh->e_shoff);
5877c478bd9Sstevel@tonic-gate 	dst.d_size = eh->e_shentsize;
5887c478bd9Sstevel@tonic-gate 	for (s = elf->ed_hdscn; s != 0; s = s->s_next) {
5897c478bd9Sstevel@tonic-gate 		assert((uintptr_t)dst.d_buf < ((uintptr_t)image + outsz));
5907c478bd9Sstevel@tonic-gate 		s->s_shflags &= ~ELF_F_DIRTY;
5917c478bd9Sstevel@tonic-gate 		s->s_uflags &= ~ELF_F_DIRTY;
5927c478bd9Sstevel@tonic-gate 		src.d_buf = s->s_shdr;
5937c478bd9Sstevel@tonic-gate 
5947c478bd9Sstevel@tonic-gate 		if (elf_xlatetof(&dst, &src, encode) == 0) {
5957c478bd9Sstevel@tonic-gate 			elf->ed_uflags |= ELF_F_DIRTY;
5967c478bd9Sstevel@tonic-gate 			return (0);
5977c478bd9Sstevel@tonic-gate 		}
5987c478bd9Sstevel@tonic-gate 
5997c478bd9Sstevel@tonic-gate 		dst.d_buf = (char *)dst.d_buf + eh->e_shentsize;
6007c478bd9Sstevel@tonic-gate 	}
6017c478bd9Sstevel@tonic-gate 	/*
6027c478bd9Sstevel@tonic-gate 	 * ELF_C_WRIMAGE signifyes that we build the memory image, but
6037c478bd9Sstevel@tonic-gate 	 * that we do not actually write it to disk.  This is used
6047c478bd9Sstevel@tonic-gate 	 * by ld(1) to build up a full image of an elf file and then
6057c478bd9Sstevel@tonic-gate 	 * to process the file before it's actually written out to
6067c478bd9Sstevel@tonic-gate 	 * disk.  This saves ld(1) the overhead of having to write
6077c478bd9Sstevel@tonic-gate 	 * the image out to disk twice.
6087c478bd9Sstevel@tonic-gate 	 */
6097c478bd9Sstevel@tonic-gate 	if (update_cmd == ELF_C_WRIMAGE) {
6107c478bd9Sstevel@tonic-gate 		elf->ed_uflags &= ~ELF_F_DIRTY;
6117c478bd9Sstevel@tonic-gate 		elf->ed_wrimage = image;
6127c478bd9Sstevel@tonic-gate 		elf->ed_wrimagesz = outsz;
6137c478bd9Sstevel@tonic-gate 		return (outsz);
6147c478bd9Sstevel@tonic-gate 	}
6157c478bd9Sstevel@tonic-gate 
6167c478bd9Sstevel@tonic-gate 	if (_elf_outsync(elf->ed_fd, image, outsz,
6177c478bd9Sstevel@tonic-gate 	    ((elf->ed_myflags & EDF_IMALLOC) ? 0 : 1)) != 0) {
6187c478bd9Sstevel@tonic-gate 		elf->ed_uflags &= ~ELF_F_DIRTY;
6197c478bd9Sstevel@tonic-gate 		elf->ed_myflags &= ~EDF_IMALLOC;
6207c478bd9Sstevel@tonic-gate 		return (outsz);
6217c478bd9Sstevel@tonic-gate 	}
6227c478bd9Sstevel@tonic-gate 
6237c478bd9Sstevel@tonic-gate 	elf->ed_uflags |= ELF_F_DIRTY;
6247c478bd9Sstevel@tonic-gate 	return (0);
6257c478bd9Sstevel@tonic-gate }
6267c478bd9Sstevel@tonic-gate 
6277c478bd9Sstevel@tonic-gate 
6287c478bd9Sstevel@tonic-gate 
6297c478bd9Sstevel@tonic-gate 
6307c478bd9Sstevel@tonic-gate /*
6317c478bd9Sstevel@tonic-gate  * The following is a private interface between the linkers (ld & ld.so.1)
6327c478bd9Sstevel@tonic-gate  * and libelf:
6337c478bd9Sstevel@tonic-gate  *
6347c478bd9Sstevel@tonic-gate  * elf_update(elf, ELF_C_WRIMAGE)
6357c478bd9Sstevel@tonic-gate  *	This will cause full image representing the elf file
6367c478bd9Sstevel@tonic-gate  *	described by the elf pointer to be built in memory.  If the
6377c478bd9Sstevel@tonic-gate  *	elf pointer has a valid file descriptor associated with it
6387c478bd9Sstevel@tonic-gate  *	we will attempt to build the memory image from mmap()'ed
6397c478bd9Sstevel@tonic-gate  *	storage.  If the elf descriptor does not have a valid
6407c478bd9Sstevel@tonic-gate  *	file descriptor (opened with elf_begin(0, ELF_C_IMAGE, 0))
6417c478bd9Sstevel@tonic-gate  *	then the image will be allocated from dynamic memory (malloc()).
6427c478bd9Sstevel@tonic-gate  *
6437c478bd9Sstevel@tonic-gate  *	elf_update() will return the size of the memory image built
6447c478bd9Sstevel@tonic-gate  *	when sucessful.
6457c478bd9Sstevel@tonic-gate  *
6467c478bd9Sstevel@tonic-gate  *	When a subsequent call to elf_update() with ELF_C_WRITE as
6477c478bd9Sstevel@tonic-gate  *	the command is performed it will sync the image created
6487c478bd9Sstevel@tonic-gate  *	by ELF_C_WRIMAGE to disk (if fd available) and
6497c478bd9Sstevel@tonic-gate  *	free the memory allocated.
6507c478bd9Sstevel@tonic-gate  */
6517c478bd9Sstevel@tonic-gate 
6527c478bd9Sstevel@tonic-gate off_t
6537c478bd9Sstevel@tonic-gate _elfxx_update(Elf * elf, Elf_Cmd cmd)
6547c478bd9Sstevel@tonic-gate {
6557c478bd9Sstevel@tonic-gate 	size_t		sz;
6567c478bd9Sstevel@tonic-gate 	unsigned	u;
6577c478bd9Sstevel@tonic-gate 	Ehdr		*eh = elf->ed_ehdr;
6587c478bd9Sstevel@tonic-gate 
6597c478bd9Sstevel@tonic-gate 	if (elf == 0)
6607c478bd9Sstevel@tonic-gate 		return (-1);
6617c478bd9Sstevel@tonic-gate 
6627c478bd9Sstevel@tonic-gate 	ELFWLOCK(elf)
6637c478bd9Sstevel@tonic-gate 	switch (cmd) {
6647c478bd9Sstevel@tonic-gate 	default:
6657c478bd9Sstevel@tonic-gate 		_elf_seterr(EREQ_UPDATE, 0);
6667c478bd9Sstevel@tonic-gate 		ELFUNLOCK(elf)
6677c478bd9Sstevel@tonic-gate 		return (-1);
6687c478bd9Sstevel@tonic-gate 
6697c478bd9Sstevel@tonic-gate 	case ELF_C_WRIMAGE:
6707c478bd9Sstevel@tonic-gate 		if ((elf->ed_myflags & EDF_WRITE) == 0) {
6717c478bd9Sstevel@tonic-gate 			_elf_seterr(EREQ_UPDWRT, 0);
6727c478bd9Sstevel@tonic-gate 			ELFUNLOCK(elf)
6737c478bd9Sstevel@tonic-gate 			return (-1);
6747c478bd9Sstevel@tonic-gate 		}
6757c478bd9Sstevel@tonic-gate 		break;
6767c478bd9Sstevel@tonic-gate 	case ELF_C_WRITE:
6777c478bd9Sstevel@tonic-gate 		if ((elf->ed_myflags & EDF_WRITE) == 0) {
6787c478bd9Sstevel@tonic-gate 			_elf_seterr(EREQ_UPDWRT, 0);
6797c478bd9Sstevel@tonic-gate 			ELFUNLOCK(elf)
6807c478bd9Sstevel@tonic-gate 			return (-1);
6817c478bd9Sstevel@tonic-gate 		}
6827c478bd9Sstevel@tonic-gate 		if (elf->ed_wrimage) {
6837c478bd9Sstevel@tonic-gate 			if (elf->ed_myflags & EDF_WRALLOC) {
6847c478bd9Sstevel@tonic-gate 				free(elf->ed_wrimage);
6857c478bd9Sstevel@tonic-gate 				/*
6867c478bd9Sstevel@tonic-gate 				 * The size is still returned even
6877c478bd9Sstevel@tonic-gate 				 * though nothing is actually written
6887c478bd9Sstevel@tonic-gate 				 * out.  This is just to be consistant
6897c478bd9Sstevel@tonic-gate 				 * with the rest of the interface.
6907c478bd9Sstevel@tonic-gate 				 */
6917c478bd9Sstevel@tonic-gate 				sz = elf->ed_wrimagesz;
6927c478bd9Sstevel@tonic-gate 				elf->ed_wrimage = 0;
6937c478bd9Sstevel@tonic-gate 				elf->ed_wrimagesz = 0;
6947c478bd9Sstevel@tonic-gate 				ELFUNLOCK(elf);
6957c478bd9Sstevel@tonic-gate 				return ((off_t)sz);
6967c478bd9Sstevel@tonic-gate 			}
6977c478bd9Sstevel@tonic-gate 			sz = _elf_outsync(elf->ed_fd, elf->ed_wrimage,
6987c478bd9Sstevel@tonic-gate 				elf->ed_wrimagesz,
6997c478bd9Sstevel@tonic-gate 				(elf->ed_myflags & EDF_IMALLOC ? 0 : 1));
7007c478bd9Sstevel@tonic-gate 			elf->ed_myflags &= ~EDF_IMALLOC;
7017c478bd9Sstevel@tonic-gate 			elf->ed_wrimage = 0;
7027c478bd9Sstevel@tonic-gate 			elf->ed_wrimagesz = 0;
7037c478bd9Sstevel@tonic-gate 			ELFUNLOCK(elf);
7047c478bd9Sstevel@tonic-gate 			return ((off_t)sz);
7057c478bd9Sstevel@tonic-gate 		}
7067c478bd9Sstevel@tonic-gate 		/* FALLTHROUGH */
7077c478bd9Sstevel@tonic-gate 	case ELF_C_NULL:
7087c478bd9Sstevel@tonic-gate 		break;
7097c478bd9Sstevel@tonic-gate 	}
7107c478bd9Sstevel@tonic-gate 
7117c478bd9Sstevel@tonic-gate 	if (eh == 0) {
7127c478bd9Sstevel@tonic-gate 		_elf_seterr(ESEQ_EHDR, 0);
7137c478bd9Sstevel@tonic-gate 		ELFUNLOCK(elf)
7147c478bd9Sstevel@tonic-gate 		return (-1);
7157c478bd9Sstevel@tonic-gate 	}
7167c478bd9Sstevel@tonic-gate 
7177c478bd9Sstevel@tonic-gate 	if ((u = eh->e_version) > EV_CURRENT) {
7187c478bd9Sstevel@tonic-gate 		_elf_seterr(EREQ_VER, 0);
7197c478bd9Sstevel@tonic-gate 		ELFUNLOCK(elf)
7207c478bd9Sstevel@tonic-gate 		return (-1);
7217c478bd9Sstevel@tonic-gate 	}
7227c478bd9Sstevel@tonic-gate 
7237c478bd9Sstevel@tonic-gate 	if (u == EV_NONE)
7247c478bd9Sstevel@tonic-gate 		eh->e_version = EV_CURRENT;
7257c478bd9Sstevel@tonic-gate 
7267c478bd9Sstevel@tonic-gate 	if ((u = eh->e_ident[EI_DATA]) == ELFDATANONE) {
7277c478bd9Sstevel@tonic-gate 		unsigned	encode;
7287c478bd9Sstevel@tonic-gate 
7297c478bd9Sstevel@tonic-gate 		ELFACCESSDATA(encode, _elf_encode)
7307c478bd9Sstevel@tonic-gate 		if (encode == ELFDATANONE) {
7317c478bd9Sstevel@tonic-gate 			_elf_seterr(EREQ_ENCODE, 0);
7327c478bd9Sstevel@tonic-gate 			ELFUNLOCK(elf)
7337c478bd9Sstevel@tonic-gate 			return (-1);
7347c478bd9Sstevel@tonic-gate 		}
7357c478bd9Sstevel@tonic-gate 		/* LINTED */
7367c478bd9Sstevel@tonic-gate 		eh->e_ident[EI_DATA] = (Byte)encode;
7377c478bd9Sstevel@tonic-gate 	}
7387c478bd9Sstevel@tonic-gate 
7397c478bd9Sstevel@tonic-gate 	u = 1;
7407c478bd9Sstevel@tonic-gate 	if (elf->ed_uflags & ELF_F_LAYOUT) {
7417c478bd9Sstevel@tonic-gate 		sz = _elf_upd_usr(elf);
7427c478bd9Sstevel@tonic-gate 		u = 0;
7437c478bd9Sstevel@tonic-gate 	} else
7447c478bd9Sstevel@tonic-gate 		sz = _elf_upd_lib(elf);
7457c478bd9Sstevel@tonic-gate 
7467c478bd9Sstevel@tonic-gate 	if ((sz != 0) && ((cmd == ELF_C_WRITE) || (cmd == ELF_C_WRIMAGE)))
7477c478bd9Sstevel@tonic-gate 		sz = wrt(elf, (Xword)sz, u, cmd);
7487c478bd9Sstevel@tonic-gate 
7497c478bd9Sstevel@tonic-gate 	if (sz == 0) {
7507c478bd9Sstevel@tonic-gate 		ELFUNLOCK(elf)
7517c478bd9Sstevel@tonic-gate 		return (-1);
7527c478bd9Sstevel@tonic-gate 	}
7537c478bd9Sstevel@tonic-gate 
7547c478bd9Sstevel@tonic-gate 	ELFUNLOCK(elf)
7557c478bd9Sstevel@tonic-gate 	return ((off_t)sz);
7567c478bd9Sstevel@tonic-gate }
7577c478bd9Sstevel@tonic-gate 
7587c478bd9Sstevel@tonic-gate 
7597c478bd9Sstevel@tonic-gate #ifndef _ELF64
7607c478bd9Sstevel@tonic-gate /* class-independent, only needs to be compiled once */
7617c478bd9Sstevel@tonic-gate 
7627c478bd9Sstevel@tonic-gate off_t
7637c478bd9Sstevel@tonic-gate elf_update(Elf *elf, Elf_Cmd cmd)
7647c478bd9Sstevel@tonic-gate {
7657c478bd9Sstevel@tonic-gate 	if (elf == 0)
7667c478bd9Sstevel@tonic-gate 		return (-1);
7677c478bd9Sstevel@tonic-gate 
7687c478bd9Sstevel@tonic-gate 	if (elf->ed_class == ELFCLASS32)
7697c478bd9Sstevel@tonic-gate 		return (_elf32_update(elf, cmd));
7707c478bd9Sstevel@tonic-gate 	else if (elf->ed_class == ELFCLASS64) {
7717c478bd9Sstevel@tonic-gate 		return (_elf64_update(elf, cmd));
7727c478bd9Sstevel@tonic-gate 	}
7737c478bd9Sstevel@tonic-gate 
7747c478bd9Sstevel@tonic-gate 	_elf_seterr(EREQ_CLASS, 0);
7757c478bd9Sstevel@tonic-gate 	return (-1);
7767c478bd9Sstevel@tonic-gate }
7777c478bd9Sstevel@tonic-gate 
7787c478bd9Sstevel@tonic-gate /*
7797c478bd9Sstevel@tonic-gate  * 4106312, 4106398, This is an ad-hoc means for the 32-bit
7807c478bd9Sstevel@tonic-gate  * Elf64 version of libld.so.3 to get around the limitation
7817c478bd9Sstevel@tonic-gate  * of a 32-bit d_off field.  This is only intended to be
7827c478bd9Sstevel@tonic-gate  * used by libld to relocate symbols in large NOBITS sections.
7837c478bd9Sstevel@tonic-gate  */
7847c478bd9Sstevel@tonic-gate Elf64_Off
7857c478bd9Sstevel@tonic-gate _elf_getxoff(Elf_Data * d)
7867c478bd9Sstevel@tonic-gate {
7877c478bd9Sstevel@tonic-gate 	return (((Dnode *)d)->db_xoff);
7887c478bd9Sstevel@tonic-gate }
7897c478bd9Sstevel@tonic-gate #endif /* !_ELF64 */
790