xref: /freebsd/contrib/elftoolchain/libelf/gelf_phdr.c (revision b4e9f2392c723b6ebad4cfb1e5a148445b864bb5)
12de3b87aSKai Wang /*-
22de3b87aSKai Wang  * Copyright (c) 2006,2008 Joseph Koshy
32de3b87aSKai Wang  * All rights reserved.
42de3b87aSKai Wang  *
52de3b87aSKai Wang  * Redistribution and use in source and binary forms, with or without
62de3b87aSKai Wang  * modification, are permitted provided that the following conditions
72de3b87aSKai Wang  * are met:
82de3b87aSKai Wang  * 1. Redistributions of source code must retain the above copyright
92de3b87aSKai Wang  *    notice, this list of conditions and the following disclaimer.
102de3b87aSKai Wang  * 2. Redistributions in binary form must reproduce the above copyright
112de3b87aSKai Wang  *    notice, this list of conditions and the following disclaimer in the
122de3b87aSKai Wang  *    documentation and/or other materials provided with the distribution.
132de3b87aSKai Wang  *
142de3b87aSKai Wang  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
152de3b87aSKai Wang  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
162de3b87aSKai Wang  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
172de3b87aSKai Wang  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
182de3b87aSKai Wang  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
192de3b87aSKai Wang  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
202de3b87aSKai Wang  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
212de3b87aSKai Wang  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
222de3b87aSKai Wang  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
232de3b87aSKai Wang  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
242de3b87aSKai Wang  * SUCH DAMAGE.
252de3b87aSKai Wang  */
262de3b87aSKai Wang 
272de3b87aSKai Wang #include <sys/cdefs.h>
282de3b87aSKai Wang 
292de3b87aSKai Wang #include <gelf.h>
302de3b87aSKai Wang #include <libelf.h>
312de3b87aSKai Wang #include <limits.h>
32*b4e9f239SEd Maste #include <stdint.h>
332de3b87aSKai Wang 
342de3b87aSKai Wang #include "_libelf.h"
352de3b87aSKai Wang 
362de3b87aSKai Wang ELFTC_VCSID("$Id: gelf_phdr.c 2268 2011-12-03 17:05:11Z jkoshy $");
372de3b87aSKai Wang 
382de3b87aSKai Wang Elf32_Phdr *
392de3b87aSKai Wang elf32_getphdr(Elf *e)
402de3b87aSKai Wang {
412de3b87aSKai Wang 	return (_libelf_getphdr(e, ELFCLASS32));
422de3b87aSKai Wang }
432de3b87aSKai Wang 
442de3b87aSKai Wang Elf64_Phdr *
452de3b87aSKai Wang elf64_getphdr(Elf *e)
462de3b87aSKai Wang {
472de3b87aSKai Wang 	return (_libelf_getphdr(e, ELFCLASS64));
482de3b87aSKai Wang }
492de3b87aSKai Wang 
502de3b87aSKai Wang GElf_Phdr *
512de3b87aSKai Wang gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
522de3b87aSKai Wang {
532de3b87aSKai Wang 	int ec;
542de3b87aSKai Wang 	Elf32_Ehdr *eh32;
552de3b87aSKai Wang 	Elf64_Ehdr *eh64;
562de3b87aSKai Wang 	Elf32_Phdr *ep32;
572de3b87aSKai Wang 	Elf64_Phdr *ep64;
582de3b87aSKai Wang 
592de3b87aSKai Wang 	if (d == NULL || e == NULL ||
602de3b87aSKai Wang 	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
612de3b87aSKai Wang 	    (e->e_kind != ELF_K_ELF) || index < 0) {
622de3b87aSKai Wang 		LIBELF_SET_ERROR(ARGUMENT, 0);
632de3b87aSKai Wang 		return (NULL);
642de3b87aSKai Wang 	}
652de3b87aSKai Wang 
662de3b87aSKai Wang 	if (ec == ELFCLASS32) {
672de3b87aSKai Wang 		if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
682de3b87aSKai Wang 		    ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
692de3b87aSKai Wang 			return (NULL);
702de3b87aSKai Wang 
712de3b87aSKai Wang 		if (index >= eh32->e_phnum) {
722de3b87aSKai Wang 			LIBELF_SET_ERROR(ARGUMENT, 0);
732de3b87aSKai Wang 			return (NULL);
742de3b87aSKai Wang 		}
752de3b87aSKai Wang 
762de3b87aSKai Wang 		ep32 += index;
772de3b87aSKai Wang 
782de3b87aSKai Wang 		d->p_type   = ep32->p_type;
792de3b87aSKai Wang 		d->p_offset = ep32->p_offset;
802de3b87aSKai Wang 		d->p_vaddr  = (Elf64_Addr) ep32->p_vaddr;
812de3b87aSKai Wang 		d->p_paddr  = (Elf64_Addr) ep32->p_paddr;
822de3b87aSKai Wang 		d->p_filesz = (Elf64_Xword) ep32->p_filesz;
832de3b87aSKai Wang 		d->p_memsz  = (Elf64_Xword) ep32->p_memsz;
842de3b87aSKai Wang 		d->p_flags  = ep32->p_flags;
852de3b87aSKai Wang 		d->p_align  = (Elf64_Xword) ep32->p_align;
862de3b87aSKai Wang 
872de3b87aSKai Wang 	} else {
882de3b87aSKai Wang 		if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
892de3b87aSKai Wang 		    (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
902de3b87aSKai Wang 			return (NULL);
912de3b87aSKai Wang 
922de3b87aSKai Wang 		if (index >= eh64->e_phnum) {
932de3b87aSKai Wang 			LIBELF_SET_ERROR(ARGUMENT, 0);
942de3b87aSKai Wang 			return (NULL);
952de3b87aSKai Wang 		}
962de3b87aSKai Wang 
972de3b87aSKai Wang 		ep64 += index;
982de3b87aSKai Wang 
992de3b87aSKai Wang 		*d = *ep64;
1002de3b87aSKai Wang 	}
1012de3b87aSKai Wang 
1022de3b87aSKai Wang 	return (d);
1032de3b87aSKai Wang }
1042de3b87aSKai Wang 
1052de3b87aSKai Wang Elf32_Phdr *
1062de3b87aSKai Wang elf32_newphdr(Elf *e, size_t count)
1072de3b87aSKai Wang {
1082de3b87aSKai Wang 	return (_libelf_newphdr(e, ELFCLASS32, count));
1092de3b87aSKai Wang }
1102de3b87aSKai Wang 
1112de3b87aSKai Wang Elf64_Phdr *
1122de3b87aSKai Wang elf64_newphdr(Elf *e, size_t count)
1132de3b87aSKai Wang {
1142de3b87aSKai Wang 	return (_libelf_newphdr(e, ELFCLASS64, count));
1152de3b87aSKai Wang }
1162de3b87aSKai Wang 
1172de3b87aSKai Wang void *
1182de3b87aSKai Wang gelf_newphdr(Elf *e, size_t count)
1192de3b87aSKai Wang {
1202de3b87aSKai Wang 	if (e == NULL) {
1212de3b87aSKai Wang 		LIBELF_SET_ERROR(ARGUMENT, 0);
1222de3b87aSKai Wang 		return (NULL);
1232de3b87aSKai Wang 	}
1242de3b87aSKai Wang 	return (_libelf_newphdr(e, e->e_class, count));
1252de3b87aSKai Wang }
1262de3b87aSKai Wang 
1272de3b87aSKai Wang int
1282de3b87aSKai Wang gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
1292de3b87aSKai Wang {
1302de3b87aSKai Wang 	int ec, phnum;
1312de3b87aSKai Wang 	void *ehdr;
1322de3b87aSKai Wang 	Elf32_Phdr *ph32;
1332de3b87aSKai Wang 	Elf64_Phdr *ph64;
1342de3b87aSKai Wang 
1352de3b87aSKai Wang 	if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
1362de3b87aSKai Wang 	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
1372de3b87aSKai Wang 		LIBELF_SET_ERROR(ARGUMENT, 0);
1382de3b87aSKai Wang 		return (0);
1392de3b87aSKai Wang 	}
1402de3b87aSKai Wang 
1412de3b87aSKai Wang 	if (e->e_cmd == ELF_C_READ) {
1422de3b87aSKai Wang 		LIBELF_SET_ERROR(MODE, 0);
1432de3b87aSKai Wang 		return (0);
1442de3b87aSKai Wang 	}
1452de3b87aSKai Wang 
1462de3b87aSKai Wang 	if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
1472de3b87aSKai Wang 		return (0);
1482de3b87aSKai Wang 
1492de3b87aSKai Wang 	if (ec == ELFCLASS32)
1502de3b87aSKai Wang 		phnum = ((Elf32_Ehdr *) ehdr)->e_phnum;
1512de3b87aSKai Wang 	else
1522de3b87aSKai Wang 		phnum = ((Elf64_Ehdr *) ehdr)->e_phnum;
1532de3b87aSKai Wang 
1542de3b87aSKai Wang 	if (ndx < 0 || ndx > phnum) {
1552de3b87aSKai Wang 		LIBELF_SET_ERROR(ARGUMENT, 0);
1562de3b87aSKai Wang 		return (0);
1572de3b87aSKai Wang 	}
1582de3b87aSKai Wang 
1592de3b87aSKai Wang 	(void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
1602de3b87aSKai Wang 
1612de3b87aSKai Wang 	if (ec == ELFCLASS64) {
1622de3b87aSKai Wang 		ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
1632de3b87aSKai Wang 		*ph64 = *s;
1642de3b87aSKai Wang 		return (1);
1652de3b87aSKai Wang 	}
1662de3b87aSKai Wang 
1672de3b87aSKai Wang 	ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
1682de3b87aSKai Wang 
1692de3b87aSKai Wang 	ph32->p_type     =  s->p_type;
1702de3b87aSKai Wang 	ph32->p_flags    =  s->p_flags;
1712de3b87aSKai Wang 	LIBELF_COPY_U32(ph32, s, p_offset);
1722de3b87aSKai Wang 	LIBELF_COPY_U32(ph32, s, p_vaddr);
1732de3b87aSKai Wang 	LIBELF_COPY_U32(ph32, s, p_paddr);
1742de3b87aSKai Wang 	LIBELF_COPY_U32(ph32, s, p_filesz);
1752de3b87aSKai Wang 	LIBELF_COPY_U32(ph32, s, p_memsz);
1762de3b87aSKai Wang 	LIBELF_COPY_U32(ph32, s, p_align);
1772de3b87aSKai Wang 
1782de3b87aSKai Wang 	return (1);
1792de3b87aSKai Wang }
180