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Bahadir Balban
324
libs/elf/src/elf32.c
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324
libs/elf/src/elf32.c
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/*
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* Australian Public Licence B (OZPLB)
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*
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* Version 1-0
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*
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* Copyright (c) 2004 University of New South Wales
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*
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* All rights reserved.
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*
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* Developed by: Operating Systems and Distributed Systems Group (DiSy)
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* University of New South Wales
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* http://www.disy.cse.unsw.edu.au
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*
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* Permission is granted by University of New South Wales, free of charge, to
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* any person obtaining a copy of this software and any associated
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* documentation files (the "Software") to deal with the Software without
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* restriction, including (without limitation) the rights to use, copy,
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* modify, adapt, merge, publish, distribute, communicate to the public,
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* sublicense, and/or sell, lend or rent out copies of the Software, and
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* to permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimers.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimers in the documentation and/or other materials provided
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* with the distribution.
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*
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* * Neither the name of University of New South Wales, nor the names of its
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* contributors, may be used to endorse or promote products derived
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* from this Software without specific prior written permission.
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*
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* EXCEPT AS EXPRESSLY STATED IN THIS LICENCE AND TO THE FULL EXTENT
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* PERMITTED BY APPLICABLE LAW, THE SOFTWARE IS PROVIDED "AS-IS", AND
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* NATIONAL ICT AUSTRALIA AND ITS CONTRIBUTORS MAKE NO REPRESENTATIONS,
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* WARRANTIES OR CONDITIONS OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO ANY REPRESENTATIONS, WARRANTIES OR CONDITIONS
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* REGARDING THE CONTENTS OR ACCURACY OF THE SOFTWARE, OR OF TITLE,
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT,
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* THE ABSENCE OF LATENT OR OTHER DEFECTS, OR THE PRESENCE OR ABSENCE OF
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* ERRORS, WHETHER OR NOT DISCOVERABLE.
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*
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* TO THE FULL EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL
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* NATIONAL ICT AUSTRALIA OR ITS CONTRIBUTORS BE LIABLE ON ANY LEGAL
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* THEORY (INCLUDING, WITHOUT LIMITATION, IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHERWISE) FOR ANY CLAIM, LOSS, DAMAGES OR OTHER
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* LIABILITY, INCLUDING (WITHOUT LIMITATION) LOSS OF PRODUCTION OR
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* OPERATION TIME, LOSS, DAMAGE OR CORRUPTION OF DATA OR RECORDS; OR LOSS
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* OF ANTICIPATED SAVINGS, OPPORTUNITY, REVENUE, PROFIT OR GOODWILL, OR
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* OTHER ECONOMIC LOSS; OR ANY SPECIAL, INCIDENTAL, INDIRECT,
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* CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES, ARISING OUT OF OR IN
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* CONNECTION WITH THIS LICENCE, THE SOFTWARE OR THE USE OF OR OTHER
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* DEALINGS WITH THE SOFTWARE, EVEN IF NATIONAL ICT AUSTRALIA OR ITS
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* CONTRIBUTORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH CLAIM, LOSS,
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* DAMAGES OR OTHER LIABILITY.
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*
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* If applicable legislation implies representations, warranties, or
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* conditions, or imposes obligations or liability on University of New South
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* Wales or one of its contributors in respect of the Software that
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* cannot be wholly or partly excluded, restricted or modified, the
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* liability of University of New South Wales or the contributor is limited, to
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* the full extent permitted by the applicable legislation, at its
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* option, to:
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* a. in the case of goods, any one or more of the following:
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* i. the replacement of the goods or the supply of equivalent goods;
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* ii. the repair of the goods;
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* iii. the payment of the cost of replacing the goods or of acquiring
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* equivalent goods;
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* iv. the payment of the cost of having the goods repaired; or
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* b. in the case of services:
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* i. the supplying of the services again; or
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* ii. the payment of the cost of having the services supplied again.
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*
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* The construction, validity and performance of this licence is governed
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* by the laws in force in New South Wales, Australia.
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*/
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#include <elf/elf.h>
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#include <string.h>
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#include <inttypes.h>
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int
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elf32_checkFile(struct Elf32_Header *file)
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{
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if (file->e_ident[EI_MAG0] != ELFMAG0
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|| file->e_ident[EI_MAG1] != ELFMAG1
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|| file->e_ident[EI_MAG2] != ELFMAG2
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|| file->e_ident[EI_MAG3] != ELFMAG3)
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return -1; /* not an elf file */
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if (file->e_ident[EI_CLASS] != ELFCLASS32)
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return -2; /* not 32-bit file */
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return 0; /* elf file looks OK */
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}
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/*
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* Returns the number of program segments in this elf file.
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*/
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unsigned
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elf32_getNumSections(struct Elf32_Header *elfFile)
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{
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return elfFile->e_shnum;
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}
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char *
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elf32_getStringTable(struct Elf32_Header *elfFile)
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{
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struct Elf32_Shdr *sections = elf32_getSectionTable(elfFile);
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return (char *)elfFile + sections[elfFile->e_shstrndx].sh_offset;
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}
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/* Returns a pointer to the program segment table, which is an array of
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* ELF32_Phdr_t structs. The size of the array can be found by calling
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* getNumProgramSegments. */
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struct Elf32_Phdr *
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elf32_getProgramSegmentTable(struct Elf32_Header *elfFile)
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{
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struct Elf32_Header *fileHdr = elfFile;
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return (struct Elf32_Phdr *) (fileHdr->e_phoff + (long) elfFile);
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}
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/* Returns the number of program segments in this elf file. */
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uint16_t
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elf32_getNumProgramHeaders(struct Elf32_Header *elfFile)
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{
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struct Elf32_Header *fileHdr = elfFile;
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return fileHdr->e_phnum;
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}
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char *
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elf32_getSectionName(struct Elf32_Header *elfFile, int i)
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{
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struct Elf32_Shdr *sections = elf32_getSectionTable(elfFile);
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char *str_table = elf32_getSegmentStringTable(elfFile);
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if (str_table == NULL) {
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return "<corrupted>";
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} else {
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return str_table + sections[i].sh_name;
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}
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}
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uint32_t
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elf32_getSectionSize(struct Elf32_Header *elfFile, int i)
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{
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struct Elf32_Shdr *sections = elf32_getSectionTable(elfFile);
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return sections[i].sh_size;
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}
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uint32_t
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elf32_getSectionAddr(struct Elf32_Header *elfFile, int i)
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{
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struct Elf32_Shdr *sections = elf32_getSectionTable(elfFile);
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return sections[i].sh_addr;
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}
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void *
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elf32_getSection(struct Elf32_Header *elfFile, int i)
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{
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struct Elf32_Shdr *sections = elf32_getSectionTable(elfFile);
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return (char *)elfFile + sections[i].sh_offset;
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}
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void *
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elf32_getSectionNamed(struct Elf32_Header *elfFile, char *str)
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{
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int numSections = elf32_getNumSections(elfFile);
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int i;
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for (i = 0; i < numSections; i++) {
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if (strcmp(str, elf32_getSectionName(elfFile, i)) == 0) {
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return elf32_getSection(elfFile, i);
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}
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}
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return NULL;
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}
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char *
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elf32_getSegmentStringTable(struct Elf32_Header *elfFile)
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{
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struct Elf32_Header *fileHdr = (struct Elf32_Header *) elfFile;
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if (fileHdr->e_shstrndx == 0) {
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return NULL;
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} else {
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return elf32_getStringTable(elfFile);
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}
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}
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#ifdef ELF_DEBUG
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void
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elf32_printStringTable(struct Elf32_Header *elfFile)
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{
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int counter;
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struct Elf32_Shdr *sections = elf32_getSectionTable(elfFile);
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char * stringTable;
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if (!sections) {
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printf("No sections.\n");
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return;
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}
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stringTable = ((void *)elfFile) + sections[elfFile->e_shstrndx].sh_offset;
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printf("File is %p; sections is %p; string table is %p\n", elfFile, sections, stringTable);
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for (counter=0; counter < sections[elfFile->e_shstrndx].sh_size; counter++) {
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printf("%02x %c ", stringTable[counter],
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stringTable[counter] >= 0x20 ? stringTable[counter] : '.');
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}
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}
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#endif
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int
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elf32_getSegmentType (struct Elf32_Header *elfFile, int segment)
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{
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return elf32_getProgramSegmentTable(elfFile)[segment].p_type;
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}
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void
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elf32_getSegmentInfo(struct Elf32_Header *elfFile, int segment, uint64_t *p_vaddr, uint64_t *p_addr, uint64_t *p_filesz, uint64_t *p_offset, uint64_t *p_memsz)
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{
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struct Elf32_Phdr *segments;
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segments = elf32_getProgramSegmentTable(elfFile);
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*p_addr = segments[segment].p_paddr;
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*p_vaddr = segments[segment].p_vaddr;
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*p_filesz = segments[segment].p_filesz;
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*p_offset = segments[segment].p_offset;
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*p_memsz = segments[segment].p_memsz;
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}
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uint32_t
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elf32_getEntryPoint (struct Elf32_Header *elfFile)
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{
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return elfFile->e_entry;
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}
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/*
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* Debugging functions
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*/
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/*
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* prints out some details of one elf file
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*/
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void
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elf32_fprintf(FILE *f, struct Elf32_Header *file, int size, const char *name, int flags)
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{
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struct Elf32_Phdr *segments;
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unsigned numSegments;
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struct Elf32_Shdr *sections;
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unsigned numSections;
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int i, r;
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char *str_table;
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fprintf(f, "Found an elf32 file called \"%s\" located "
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"at address 0x%p\n", name, file);
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if ((r = elf32_checkFile(file)) != 0) {
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char *magic = (char*) file;
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fprintf(f, "Invalid elf file (%d)\n", r);
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fprintf(f, "Magic is: %2.2hhx %2.2hhx %2.2hhx %2.2hhx\n",
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magic[0], magic[1], magic[2], magic[3]);
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return;
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}
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/*
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* get a pointer to the table of program segments
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*/
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segments = elf32_getProgramHeaderTable(file);
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numSegments = elf32_getNumProgramHeaders(file);
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sections = elf32_getSectionTable(file);
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numSections = elf32_getNumSections(file);
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if ((uintptr_t) sections > ((uintptr_t) file + size)) {
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fprintf(f, "Corrupted elfFile..\n");
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return;
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}
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/*
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* print out info about each section
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*/
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if (flags & ELF_PRINT_PROGRAM_HEADERS) {
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/*
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* print out info about each program segment
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*/
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fprintf(f, "Program Headers:\n");
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fprintf(f, " Type Offset VirtAddr PhysAddr "
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"FileSiz MemSiz Flg Align\n");
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for (i = 0; i < numSegments; i++) {
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if (segments[i].p_type != 1) {
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fprintf(f, "segment %d is not loadable, "
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"skipping\n", i);
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} else {
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fprintf(f, " LOAD 0x%06" PRIx32 " 0x%08" PRIx32 " 0x%08" PRIx32 \
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" 0x%05" PRIx32" 0x%05" PRIx32 " %c%c%c 0x%04" PRIx32 "\n",
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//fprintf(f, " LOAD 0x%" PRIxPTR " 0x%" PRIxPTR " 0x%" PRIxPTR
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// " 0x%" PRIxPTR" 0x%" PRIxPTR " %c%c%c 0x%" PRIxPTR "\n",
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segments[i].p_offset, segments[i].p_vaddr,
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segments[i].p_paddr,
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segments[i].p_filesz, segments[i].p_memsz,
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segments[i].p_flags & PF_R ? 'R' : ' ',
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segments[i].p_flags & PF_W ? 'W' : ' ',
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segments[i].p_flags & PF_X ? 'E' : ' ',
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segments[i].p_align);
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}
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}
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}
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if (flags & ELF_PRINT_SECTIONS) {
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str_table = elf32_getSegmentStringTable(file);
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printf("Section Headers:\n");
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printf(" [Nr] Name Type Addr Off\n");
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for (i = 0; i < numSections; i++) {
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//if (elf_checkSection(file, i) == 0) {
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fprintf(f, "[%2d] %s %x %x\n", i, elf32_getSectionName(file, i),
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//fprintf(f, "[%2d] %-17.17s %-15.15s %x %x\n", i, elf32_getSectionName(file, i), " ",
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///fprintf(f, "%-17.17s %-15.15s %08x %06x\n", elf32_getSectionName(file, i), " " /* sections[i].sh_type
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// */ ,
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sections[i].sh_addr, sections[i].sh_offset);
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//}
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}
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}
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}
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