125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Get CFI from ELF file's exception-handling info. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2009-2010 Red Hat, Inc. 325b3c049e70834cf33790a28643ab058b507b35cBen Cheng This file is part of Red Hat elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 625b3c049e70834cf33790a28643ab058b507b35cBen Cheng it under the terms of the GNU General Public License as published by the 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Free Software Foundation; version 2 of the License. 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 1025b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 1125b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1225b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 1325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1425b3c049e70834cf33790a28643ab058b507b35cBen Cheng You should have received a copy of the GNU General Public License along 1525b3c049e70834cf33790a28643ab058b507b35cBen Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 1625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 1725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1825b3c049e70834cf33790a28643ab058b507b35cBen Cheng In addition, as a special exception, Red Hat, Inc. gives You the 1925b3c049e70834cf33790a28643ab058b507b35cBen Cheng additional right to link the code of Red Hat elfutils with code licensed 2025b3c049e70834cf33790a28643ab058b507b35cBen Cheng under any Open Source Initiative certified open source license 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng (http://www.opensource.org/licenses/index.php) which requires the 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribution of source code with any binary distribution and to 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribute linked combinations of the two. Non-GPL Code permitted under 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng this exception must only link to the code of Red Hat elfutils through 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng those well defined interfaces identified in the file named EXCEPTION 2625b3c049e70834cf33790a28643ab058b507b35cBen Cheng found in the source code files (the "Approved Interfaces"). The files 2725b3c049e70834cf33790a28643ab058b507b35cBen Cheng of Non-GPL Code may instantiate templates or use macros or inline 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng functions from the Approved Interfaces without causing the resulting 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng work to be covered by the GNU General Public License. Only Red Hat, 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc. may make changes or additions to the list of Approved Interfaces. 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat's grant of this exception is conditioned upon your not adding 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng any new exceptions. If you wish to add a new Approved Interface or 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception, please contact Red Hat. You must obey the GNU General Public 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng License in all respects for all of the Red Hat elfutils code and other 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng code used in conjunction with Red Hat elfutils except the Non-GPL Code 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng covered by this exception. If you modify this file, you may extend this 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception to your version of the file, but you are not obligated to do 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng so. If you do not wish to provide this exception without modification, 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng you must delete this exception statement from your version and license 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng this file solely under the GPL without exception. 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is an included package of the Open Invention Network. 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng An included package of the Open Invention Network is a package for which 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Open Invention Network licensees cross-license their patents. No patent 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng license is granted, either expressly or impliedly, by designation as an 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng included package. Should you wish to participate in the Open Invention 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Network licensing program, please visit www.openinventionnetwork.com 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng <http://www.openinventionnetwork.com>. */ 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stdlib.h> 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <string.h> 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <assert.h> 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libdwP.h" 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "cfi.h" 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "encoded-value.h" 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <dwarf.h> 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6425b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic Dwarf_CFI * 6525b3c049e70834cf33790a28643ab058b507b35cBen Chengallocate_cfi (Elf *elf, GElf_Addr vaddr) 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_CFI *cfi = calloc (1, sizeof *cfi); 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (cfi == NULL) 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_NOMEM); 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->e_ident = (unsigned char *) elf_getident (elf, NULL); 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (cfi->e_ident == NULL) 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng free (cfi); 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_GETEHDR_ERROR); 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if ((BYTE_ORDER == LITTLE_ENDIAN && cfi->e_ident[EI_DATA] == ELFDATA2MSB) 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng || (BYTE_ORDER == BIG_ENDIAN && cfi->e_ident[EI_DATA] == ELFDATA2LSB)) 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->other_byte_order = true; 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->frame_vaddr = vaddr; 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->textrel = 0; /* XXX ? */ 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->datarel = 0; /* XXX ? */ 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return cfi; 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9325b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic const uint8_t * 9425b3c049e70834cf33790a28643ab058b507b35cBen Chengparse_eh_frame_hdr (const uint8_t *hdr, size_t hdr_size, GElf_Addr hdr_vaddr, 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const GElf_Ehdr *ehdr, GElf_Addr *eh_frame_vaddr, 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t *table_entries, uint8_t *table_encoding) 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng const uint8_t *h = hdr; 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (*h++ != 1) /* version */ 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (void *) -1l; 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint8_t eh_frame_ptr_encoding = *h++; 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint8_t fde_count_encoding = *h++; 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint8_t fde_table_encoding = *h++; 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (eh_frame_ptr_encoding == DW_EH_PE_omit) 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (void *) -1l; 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Dummy used by read_encoded_value. */ 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data_Scn dummy_cfi_hdr_data = 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng .d = { .d_buf = (void *) hdr, .d_size = hdr_size } 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng }; 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_CFI dummy_cfi = 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng .e_ident = ehdr->e_ident, 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng .datarel = hdr_vaddr, 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng .frame_vaddr = hdr_vaddr, 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng .data = &dummy_cfi_hdr_data, 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng }; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (read_encoded_value (&dummy_cfi, eh_frame_ptr_encoding, &h, 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng eh_frame_vaddr))) 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (void *) -1l; 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (fde_count_encoding != DW_EH_PE_omit) 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Word fde_count; 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (read_encoded_value (&dummy_cfi, fde_count_encoding, &h, 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng &fde_count))) 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (void *) -1l; 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (fde_count != 0 && (size_t) fde_count == fde_count 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng && fde_table_encoding != DW_EH_PE_omit 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng && (fde_table_encoding &~ DW_EH_PE_signed) != DW_EH_PE_uleb128) 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng *table_entries = fde_count; 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng *table_encoding = fde_table_encoding; 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return h; 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14625b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic Dwarf_CFI * 14725b3c049e70834cf33790a28643ab058b507b35cBen Chenggetcfi_gnu_eh_frame (Elf *elf, const GElf_Ehdr *ehdr, const GElf_Phdr *phdr) 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (phdr->p_filesz < 4)) 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng goto invalid; 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data *data = elf_getdata_rawchunk (elf, phdr->p_offset, phdr->p_filesz, 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng ELF_T_BYTE); 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (data == NULL) 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng invalid_hdr: 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng invalid: 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* XXX might be read error or corrupt phdr */ 15925b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_INVALID_CFI); 16025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 16125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 16225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Addr eh_frame_ptr; 16425b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t search_table_entries; 16525b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint8_t search_table_encoding; 16625b3c049e70834cf33790a28643ab058b507b35cBen Cheng const uint8_t *search_table = parse_eh_frame_hdr (data->d_buf, phdr->p_filesz, 16725b3c049e70834cf33790a28643ab058b507b35cBen Cheng phdr->p_vaddr, ehdr, 16825b3c049e70834cf33790a28643ab058b507b35cBen Cheng &eh_frame_ptr, 16925b3c049e70834cf33790a28643ab058b507b35cBen Cheng &search_table_entries, 17025b3c049e70834cf33790a28643ab058b507b35cBen Cheng &search_table_encoding); 17125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (search_table == (void *) -1l) 17225b3c049e70834cf33790a28643ab058b507b35cBen Cheng goto invalid_hdr; 17325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Off eh_frame_offset = eh_frame_ptr - phdr->p_vaddr + phdr->p_offset; 17525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_Word eh_frame_size = 0; 17625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17725b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* XXX we have no way without section headers to know the size 17825b3c049e70834cf33790a28643ab058b507b35cBen Cheng of the .eh_frame data. Calculate the largest it might possibly be. 17925b3c049e70834cf33790a28643ab058b507b35cBen Cheng This won't be wasteful if the file is already mmap'd, but if it isn't 18025b3c049e70834cf33790a28643ab058b507b35cBen Cheng it might be quite excessive. */ 18125b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t filesize; 18225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf_rawfile (elf, &filesize) != NULL) 18325b3c049e70834cf33790a28643ab058b507b35cBen Cheng eh_frame_size = filesize - eh_frame_offset; 18425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 18525b3c049e70834cf33790a28643ab058b507b35cBen Cheng data = elf_getdata_rawchunk (elf, eh_frame_offset, eh_frame_size, ELF_T_BYTE); 18625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (data == NULL) 18725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 18825b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_INVALID_ELF); /* XXX might be read error */ 18925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 19025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 19125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_CFI *cfi = allocate_cfi (elf, eh_frame_ptr); 19225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (cfi != NULL) 19325b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 19425b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->data = (Elf_Data_Scn *) data; 19525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 19625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (search_table != NULL) 19725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 19825b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->search_table = search_table; 19925b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->search_table_vaddr = phdr->p_vaddr; 20025b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->search_table_encoding = search_table_encoding; 20125b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->search_table_entries = search_table_entries; 20225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 20325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 20425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return cfi; 20525b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 20625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 20725b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Search the phdrs for PT_GNU_EH_FRAME. */ 20825b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic Dwarf_CFI * 20925b3c049e70834cf33790a28643ab058b507b35cBen Chenggetcfi_phdr (Elf *elf, const GElf_Ehdr *ehdr) 21025b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 21125b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t phnum; 21225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (elf_getphdrnum (elf, &phnum) != 0)) 21325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 21425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 21525b3c049e70834cf33790a28643ab058b507b35cBen Cheng for (size_t i = 0; i < phnum; ++i) 21625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 21725b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Phdr phdr_mem; 21825b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Phdr *phdr = gelf_getphdr (elf, i, &phdr_mem); 21925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (phdr == NULL)) 22025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 22125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (phdr->p_type == PT_GNU_EH_FRAME) 22225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return getcfi_gnu_eh_frame (elf, ehdr, phdr); 22325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 22425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 22525b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_NO_DWARF); 22625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 22725b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 22825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 22925b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic Dwarf_CFI * 23025b3c049e70834cf33790a28643ab058b507b35cBen Chenggetcfi_scn_eh_frame (Elf *elf, const GElf_Ehdr *ehdr, 23125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *scn, GElf_Shdr *shdr, 23225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *hdr_scn, GElf_Addr hdr_vaddr) 23325b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 23425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data *data = elf_rawdata (scn, NULL); 23525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (data == NULL) 23625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 23725b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_INVALID_ELF); 23825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 23925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 24025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_CFI *cfi = allocate_cfi (elf, shdr->sh_addr); 24125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (cfi != NULL) 24225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 24325b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->data = (Elf_Data_Scn *) data; 24425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (hdr_scn != NULL) 24525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 24625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data *hdr_data = elf_rawdata (hdr_scn, NULL); 24725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (hdr_data != NULL) 24825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 24925b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Addr eh_frame_vaddr; 25025b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->search_table_vaddr = hdr_vaddr; 25125b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->search_table 25225b3c049e70834cf33790a28643ab058b507b35cBen Cheng = parse_eh_frame_hdr (hdr_data->d_buf, hdr_data->d_size, 25325b3c049e70834cf33790a28643ab058b507b35cBen Cheng hdr_vaddr, ehdr, &eh_frame_vaddr, 25425b3c049e70834cf33790a28643ab058b507b35cBen Cheng &cfi->search_table_entries, 25525b3c049e70834cf33790a28643ab058b507b35cBen Cheng &cfi->search_table_encoding); 25625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (cfi->search_table == (void *) -1l) 25725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 25825b3c049e70834cf33790a28643ab058b507b35cBen Cheng free (cfi); 25925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* XXX might be read error or corrupt phdr */ 26025b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_INVALID_CFI); 26125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 26225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 26325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 26425b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Sanity check. */ 26525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (eh_frame_vaddr != shdr->sh_addr)) 26625b3c049e70834cf33790a28643ab058b507b35cBen Cheng cfi->search_table = NULL; 26725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 26825b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 26925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 27025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return cfi; 27125b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 27225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 27325b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Search for the sections named ".eh_frame" and ".eh_frame_hdr". */ 27425b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic Dwarf_CFI * 27525b3c049e70834cf33790a28643ab058b507b35cBen Chenggetcfi_shdr (Elf *elf, const GElf_Ehdr *ehdr) 27625b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 27725b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t shstrndx; 27825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf_getshdrstrndx (elf, &shstrndx) != 0) 27925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 28025b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_GETEHDR_ERROR); 28125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 28225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 28325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 28425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (shstrndx != 0) 28525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 28625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *hdr_scn = NULL; 28725b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Addr hdr_vaddr = 0; 28825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *scn = NULL; 28925b3c049e70834cf33790a28643ab058b507b35cBen Cheng while ((scn = elf_nextscn (elf, scn)) != NULL) 29025b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 29125b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Shdr shdr_mem; 29225b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); 29325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (shdr == NULL) 29425b3c049e70834cf33790a28643ab058b507b35cBen Cheng continue; 29525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *name = elf_strptr (elf, shstrndx, shdr->sh_name); 29625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (name == NULL) 29725b3c049e70834cf33790a28643ab058b507b35cBen Cheng continue; 29825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (!strcmp (name, ".eh_frame_hdr")) 29925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 30025b3c049e70834cf33790a28643ab058b507b35cBen Cheng hdr_scn = scn; 30125b3c049e70834cf33790a28643ab058b507b35cBen Cheng hdr_vaddr = shdr->sh_addr; 30225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 30325b3c049e70834cf33790a28643ab058b507b35cBen Cheng else if (!strcmp (name, ".eh_frame")) 30425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return getcfi_scn_eh_frame (elf, ehdr, scn, shdr, 30525b3c049e70834cf33790a28643ab058b507b35cBen Cheng hdr_scn, hdr_vaddr); 30625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 30725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 30825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 30925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (void *) -1l; 31025b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 31125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 31225b3c049e70834cf33790a28643ab058b507b35cBen ChengDwarf_CFI * 31325b3c049e70834cf33790a28643ab058b507b35cBen Chengdwarf_getcfi_elf (elf) 31425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf *elf; 31525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 31625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf_kind (elf) != ELF_K_ELF) 31725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 31825b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_NOELF); 31925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 32025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 32125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 32225b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Ehdr ehdr_mem; 32325b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem); 32425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (ehdr == NULL)) 32525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 32625b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libdw_seterrno (DWARF_E_INVALID_ELF); 32725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 32825b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 32925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 33025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwarf_CFI *result = getcfi_shdr (elf, ehdr); 33125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (result == (void *) -1l) 33225b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = getcfi_phdr (elf, ehdr); 33325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 33425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return result; 33525b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 33625b3c049e70834cf33790a28643ab058b507b35cBen ChengINTDEF (dwarf_getcfi_elf) 337