1cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Sniff out modules from ELF headers visible in memory segments. 2cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Copyright (C) 2008 Red Hat, Inc. 3cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng This file is part of Red Hat elfutils. 4cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 5cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 6cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng it under the terms of the GNU General Public License as published by the 7cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Free Software Foundation; version 2 of the License. 8cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 9cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 10cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 11cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng General Public License for more details. 13cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 14cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng You should have received a copy of the GNU General Public License along 15cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 16cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 17cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 18cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng In addition, as a special exception, Red Hat, Inc. gives You the 19cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng additional right to link the code of Red Hat elfutils with code licensed 20cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng under any Open Source Initiative certified open source license 21cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (http://www.opensource.org/licenses/index.php) which requires the 22cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng distribution of source code with any binary distribution and to 23cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng distribute linked combinations of the two. Non-GPL Code permitted under 24cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng this exception must only link to the code of Red Hat elfutils through 25cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng those well defined interfaces identified in the file named EXCEPTION 26cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng found in the source code files (the "Approved Interfaces"). The files 27cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng of Non-GPL Code may instantiate templates or use macros or inline 28cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng functions from the Approved Interfaces without causing the resulting 29cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng work to be covered by the GNU General Public License. Only Red Hat, 30cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Inc. may make changes or additions to the list of Approved Interfaces. 31cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat's grant of this exception is conditioned upon your not adding 32cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng any new exceptions. If you wish to add a new Approved Interface or 33cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng exception, please contact Red Hat. You must obey the GNU General Public 34cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng License in all respects for all of the Red Hat elfutils code and other 35cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng code used in conjunction with Red Hat elfutils except the Non-GPL Code 36cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng covered by this exception. If you modify this file, you may extend this 37cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng exception to your version of the file, but you are not obligated to do 38cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng so. If you do not wish to provide this exception without modification, 39cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng you must delete this exception statement from your version and license 40cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng this file solely under the GPL without exception. 41cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 42cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Red Hat elfutils is an included package of the Open Invention Network. 43cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng An included package of the Open Invention Network is a package for which 44cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Open Invention Network licensees cross-license their patents. No patent 45cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng license is granted, either expressly or impliedly, by designation as an 46cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng included package. Should you wish to participate in the Open Invention 47cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Network licensing program, please visit www.openinventionnetwork.com 48cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng <http://www.openinventionnetwork.com>. */ 49cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 50cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <config.h> 51cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include "../libelf/libelfP.h" /* For NOTE_ALIGN. */ 52cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#undef _ 53cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include "libdwflP.h" 54cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 55cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <elf.h> 56cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <gelf.h> 57cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <inttypes.h> 58cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <sys/param.h> 59cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <alloca.h> 60cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#include <endian.h> 61cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 62cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 63cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* A good size for the initial read from memory, if it's not too costly. 64cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng This more than covers the phdrs and note segment in the average 64-bit 65cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng binary. */ 66cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 67cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#define INITIAL_READ 1024 68cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 69cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#if __BYTE_ORDER == __LITTLE_ENDIAN 70cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng# define MY_ELFDATA ELFDATA2LSB 71cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#else 72cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng# define MY_ELFDATA ELFDATA2MSB 73cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng#endif 74cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 75cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 76cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng/* Return user segment index closest to ADDR but not above it. */ 77cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengstatic int 78cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengaddr_segndx (Dwfl *dwfl, size_t segment, GElf_Addr addr) 79cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 80cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng int ndx = dwfl->lookup_segndx[segment]; 81cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng do 82cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 83cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (dwfl->lookup_segndx[segment] >= 0) 84cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ndx = dwfl->lookup_segndx[segment]; 85cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ++segment; 86cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 87cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while (segment < dwfl->lookup_elts - 1 88cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && dwfl->lookup_addr[segment] < addr); 89cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 90cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while (dwfl->lookup_segndx[segment] < 0 91cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && segment < dwfl->lookup_elts - 1) 92cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ++segment; 93cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 94cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (dwfl->lookup_segndx[segment] >= 0) 95cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ndx = dwfl->lookup_segndx[segment]; 96cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 97cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return ndx; 98cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 99cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 100cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengint 101cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Chengdwfl_segment_report_module (Dwfl *dwfl, int ndx, const char *name, 102cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Dwfl_Memory_Callback *memory_callback, 103cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *memory_callback_arg, 104cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Dwfl_Module_Callback *read_eagerly, 105cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *read_eagerly_arg) 106cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng{ 107cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t segment = ndx; 108cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 109cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (segment >= dwfl->lookup_elts) 110cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng segment = dwfl->lookup_elts - 1; 111cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 112cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while (segment > 0 && dwfl->lookup_segndx[segment] > ndx) 113cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng --segment; 114cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 115cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while (dwfl->lookup_segndx[segment] < ndx) 116cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (++segment == dwfl->lookup_elts) 117cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return 0; 118cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 119cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr start = dwfl->lookup_addr[segment]; 120cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 121cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline bool segment_read (int segndx, 122cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void **buffer, size_t *buffer_available, 123cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr addr, size_t minread) 124cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 125cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return ! (*memory_callback) (dwfl, segndx, buffer, buffer_available, 126cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng addr, minread, memory_callback_arg); 127cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 128cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 129cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline void release_buffer (void **buffer, size_t *buffer_available) 130cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 131cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (*buffer != NULL) 132cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (void) segment_read (-1, buffer, buffer_available, 0, 0); 133cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 134cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 135cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* First read in the file header and check its sanity. */ 136cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 137cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *buffer = NULL; 138cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t buffer_available = INITIAL_READ; 139cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 140cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline int finish (void) 141cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 142cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng release_buffer (&buffer, &buffer_available); 143cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return ndx; 144cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 145cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 146cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (segment_read (ndx, &buffer, &buffer_available, 147cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng start, sizeof (Elf64_Ehdr)) 148cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng || memcmp (buffer, ELFMAG, SELFMAG) != 0) 149cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 150cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 151cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline bool read_portion (void **data, size_t *data_size, 152cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr vaddr, size_t filesz) 153cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 154cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (vaddr - start + filesz > buffer_available) 155cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 156cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng *data = NULL; 157cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng *data_size = filesz; 158cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return segment_read (addr_segndx (dwfl, segment, vaddr), 159cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng data, data_size, vaddr, filesz); 160cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 161cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 162cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* We already have this whole note segment from our initial read. */ 163cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng *data = vaddr - start + buffer; 164cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng *data_size = 0; 165cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return false; 166cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 167cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 168cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline void finish_portion (void **data, size_t *data_size) 169cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 170cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (*data_size != 0) 171cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng release_buffer (data, data_size); 172cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 173cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 174cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Extract the information we need from the file header. */ 175cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng union 176cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 177cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf32_Ehdr e32; 178cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf64_Ehdr e64; 179cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } ehdr; 180cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off phoff; 181cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng uint_fast16_t phnum; 182cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng uint_fast16_t phentsize; 183cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off shdrs_end; 184cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Data xlatefrom = 185cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 186cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng .d_type = ELF_T_EHDR, 187cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng .d_buf = (void *) buffer, 188cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng .d_version = EV_CURRENT, 189cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng }; 190cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf_Data xlateto = 191cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 192cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng .d_type = ELF_T_EHDR, 193cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng .d_buf = &ehdr, 194cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng .d_size = sizeof ehdr, 195cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng .d_version = EV_CURRENT, 196cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng }; 197cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng switch (((const unsigned char *) buffer)[EI_CLASS]) 198cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 199cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case ELFCLASS32: 200cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_size = sizeof (Elf32_Ehdr); 201cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf32_xlatetom (&xlateto, &xlatefrom, 202cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ((const unsigned char *) buffer)[EI_DATA]) == NULL) 203cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 204cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phoff = ehdr.e32.e_phoff; 205cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phnum = ehdr.e32.e_phnum; 206cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phentsize = ehdr.e32.e_phentsize; 207cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (phentsize != sizeof (Elf32_Phdr)) 208cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 209cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng shdrs_end = ehdr.e32.e_shoff + ehdr.e32.e_shnum * ehdr.e32.e_shentsize; 210cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 211cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 212cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case ELFCLASS64: 213cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_size = sizeof (Elf64_Ehdr); 214cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf64_xlatetom (&xlateto, &xlatefrom, 215cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ((const unsigned char *) buffer)[EI_DATA]) == NULL) 216cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 217cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phoff = ehdr.e64.e_phoff; 218cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phnum = ehdr.e64.e_phnum; 219cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phentsize = ehdr.e64.e_phentsize; 220cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (phentsize != sizeof (Elf64_Phdr)) 221cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 222cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng shdrs_end = ehdr.e64.e_shoff + ehdr.e64.e_shnum * ehdr.e64.e_shentsize; 223cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 224cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 225cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng default: 226cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 227cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 228cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 229cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* The file header tells where to find the program headers. 230cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng These are what we need to find the boundaries of the module. 231cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Without them, we don't have a module to report. */ 232cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 233cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (phnum == 0) 234cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 235cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 236cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_type = xlateto.d_type = ELF_T_PHDR; 237cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_size = phnum * phentsize; 238cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 239cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *ph_buffer = NULL; 240cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t ph_buffer_size = 0; 241cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (read_portion (&ph_buffer, &ph_buffer_size, 242cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng start + phoff, xlatefrom.d_size)) 243cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 244cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 245cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_buf = ph_buffer; 246cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 247cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng union 248cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 249cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf32_Phdr p32[phnum]; 250cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf64_Phdr p64[phnum]; 251cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } phdrs; 252cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 253cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlateto.d_buf = &phdrs; 254cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlateto.d_size = sizeof phdrs; 255cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 256cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Track the bounds of the file visible in memory. */ 257cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off file_trimmed_end = 0; /* Proper p_vaddr + p_filesz end. */ 258cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off file_end = 0; /* Rounded up to effective page size. */ 259cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off contiguous = 0; /* Visible as contiguous file from START. */ 260cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off total_filesz = 0; /* Total size of data to read. */ 261cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 262cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Collect the bias between START and the containing PT_LOAD's p_vaddr. */ 263cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr bias = 0; 264cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng bool found_bias = false; 265cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 266cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Collect the unbiased bounds of the module here. */ 267cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr module_start = -1l; 268cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr module_end = 0; 269cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 270cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* If we see PT_DYNAMIC, record it here. */ 271cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr dyn_vaddr = 0; 272cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Xword dyn_filesz = 0; 273cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 274cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Collect the build ID bits here. */ 275cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *build_id = NULL; 276cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t build_id_len = 0; 277cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr build_id_vaddr = 0; 278cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 279cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Consider a PT_NOTE we've found in the image. */ 280cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline void consider_notes (GElf_Addr vaddr, GElf_Xword filesz) 281cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 282cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* If we have already seen a build ID, we don't care any more. */ 283cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (build_id != NULL || filesz == 0) 284cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return; 285cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 286cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *data; 287cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t data_size; 288cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (read_portion (&data, &data_size, vaddr, filesz)) 289cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return; 290cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 291cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng assert (sizeof (Elf32_Nhdr) == sizeof (Elf64_Nhdr)); 292cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 293cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *notes; 294cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (ehdr.e32.e_ident[EI_DATA] == MY_ELFDATA) 295cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng notes = data; 296cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 297cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 298cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng notes = malloc (filesz); 299cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (unlikely (notes == NULL)) 300cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return; 301cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_type = xlateto.d_type = ELF_T_NHDR; 302cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_buf = (void *) data; 303cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_size = filesz; 304cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlateto.d_buf = notes; 305cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlateto.d_size = filesz; 306cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf32_xlatetom (&xlateto, &xlatefrom, 307cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ehdr.e32.e_ident[EI_DATA]) == NULL) 308cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng goto done; 309cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 310cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 311cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const GElf_Nhdr *nh = notes; 312cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng while ((const void *) nh < (const void *) notes + filesz) 313cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 314cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const void *note_name = nh + 1; 315cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const void *note_desc = note_name + NOTE_ALIGN (nh->n_namesz); 316cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (unlikely ((size_t) ((const void *) notes + filesz 317cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng - note_desc) < nh->n_descsz)) 318cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 319cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 320cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (nh->n_type == NT_GNU_BUILD_ID 321cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && nh->n_descsz > 0 322cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && nh->n_namesz == sizeof "GNU" 323cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && !memcmp (note_name, "GNU", sizeof "GNU")) 324cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 325cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng build_id_vaddr = note_desc - (const void *) notes + vaddr; 326cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng build_id_len = nh->n_descsz; 327cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng build_id = malloc (nh->n_descsz); 328cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (likely (build_id != NULL)) 329cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng memcpy (build_id, note_desc, build_id_len); 330cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 331cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 332cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 333cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng nh = note_desc + NOTE_ALIGN (nh->n_descsz); 334cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 335cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 336cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng done: 337cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (notes != data) 338cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng free (notes); 339cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng finish_portion (&data, &data_size); 340cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 341cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 342cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Consider each of the program headers we've read from the image. */ 343cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline void consider_phdr (GElf_Word type, 344cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr vaddr, GElf_Xword memsz, 345cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off offset, GElf_Xword filesz, 346cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Xword align) 347cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 348cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng switch (type) 349cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 350cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case PT_DYNAMIC: 351cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dyn_vaddr = vaddr; 352cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dyn_filesz = filesz; 353cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 354cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 355cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case PT_NOTE: 356cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* We calculate from the p_offset of the note segment, 357cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng because we don't yet know the bias for its p_vaddr. */ 358cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng consider_notes (start + offset, filesz); 359cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 360cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 361cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case PT_LOAD: 362cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng align = dwfl->segment_align > 1 ? dwfl->segment_align : align ?: 1; 363cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 364cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr vaddr_end = (vaddr + memsz + align - 1) & -align; 365cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr filesz_vaddr = filesz < memsz ? vaddr + filesz : vaddr_end; 366cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off filesz_offset = filesz_vaddr - vaddr + offset; 367cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 368cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (file_trimmed_end < offset + filesz) 369cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 370cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng file_trimmed_end = offset + filesz; 371cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 372cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Trim the last segment so we don't bother with zeros 373cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng in the last page that are off the end of the file. 374cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng However, if the extra bit in that page includes the 375cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng section headers, keep them. */ 376cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (shdrs_end <= filesz_offset && shdrs_end > file_trimmed_end) 377cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 378cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng filesz += shdrs_end - file_trimmed_end; 379cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng file_trimmed_end = shdrs_end; 380cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 381cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 382cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 383cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng total_filesz += filesz; 384cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 385cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (file_end < filesz_offset) 386cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 387cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng file_end = filesz_offset; 388cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (filesz_vaddr - start == filesz_offset) 389cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng contiguous = file_end; 390cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 391cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 392cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (!found_bias && (offset & -align) == 0 393cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && likely (filesz_offset >= phoff + phnum * phentsize)) 394cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 395cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng bias = start - vaddr; 396cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng found_bias = true; 397cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 398cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 399cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng vaddr &= -align; 400cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (vaddr < module_start) 401cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng module_start = vaddr; 402cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 403cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (module_end < vaddr_end) 404cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng module_end = vaddr_end; 405cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 406cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 407cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 408cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (ehdr.e32.e_ident[EI_CLASS] == ELFCLASS32) 409cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 410cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf32_xlatetom (&xlateto, &xlatefrom, 411cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ehdr.e32.e_ident[EI_DATA]) == NULL) 412cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng found_bias = false; /* Trigger error check. */ 413cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 414cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (uint_fast16_t i = 0; i < phnum; ++i) 415cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng consider_phdr (phdrs.p32[i].p_type, 416cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p32[i].p_vaddr, phdrs.p32[i].p_memsz, 417cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p32[i].p_offset, phdrs.p32[i].p_filesz, 418cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p32[i].p_align); 419cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 420cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 421cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 422cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf64_xlatetom (&xlateto, &xlatefrom, 423cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ehdr.e32.e_ident[EI_DATA]) == NULL) 424cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng found_bias = false; /* Trigger error check. */ 425cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 426cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (uint_fast16_t i = 0; i < phnum; ++i) 427cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng consider_phdr (phdrs.p64[i].p_type, 428cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p64[i].p_vaddr, phdrs.p64[i].p_memsz, 429cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p64[i].p_offset, phdrs.p64[i].p_filesz, 430cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p64[i].p_align); 431cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 432cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 433cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng finish_portion (&ph_buffer, &ph_buffer_size); 434cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 435cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* We must have seen the segment covering offset 0, or else the ELF 436cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng header we read at START was not produced by these program headers. */ 437cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (unlikely (!found_bias)) 438cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 439cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 440cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Now we know enough to report a module for sure: its bounds. */ 441cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng module_start += bias; 442cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng module_end += bias; 443cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 444cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dyn_vaddr += bias; 445cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 446cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Our return value now says to skip the segments contained 447cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng within the module. 448cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng XXX handle gaps 449cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng */ 450cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ndx = addr_segndx (dwfl, segment, module_end); 451cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 452cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Examine its .dynamic section to get more interesting details. 453cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng If it has DT_SONAME, we'll use that as the module name. 454cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng We need its DT_STRTAB and DT_STRSZ to decipher DT_SONAME, 455cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng and they also tell us the essential portion of the file 456cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for fetching symbols. */ 457cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr soname_stroff = 0; 458cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Addr dynstr_vaddr = 0; 459cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Xword dynstrsz = 0; 460cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline bool consider_dyn (GElf_Sxword tag, GElf_Xword val) 461cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 462cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng switch (tag) 463cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 464cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng default: 465cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return false; 466cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 467cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case DT_SONAME: 468cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng soname_stroff = val; 469cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 470cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 471cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case DT_STRTAB: 472cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dynstr_vaddr = val; 473cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 474cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 475cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng case DT_STRSZ: 476cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dynstrsz = val; 477cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 478cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 479cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 480cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return soname_stroff != 0 && dynstr_vaddr != 0 && dynstrsz != 0; 481cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 482cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 483cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const size_t dyn_entsize = (ehdr.e32.e_ident[EI_CLASS] == ELFCLASS32 484cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ? sizeof (Elf32_Dyn) : sizeof (Elf64_Dyn)); 485cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *dyn_data = NULL; 486cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t dyn_data_size = 0; 487cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (dyn_filesz != 0 && dyn_filesz % dyn_entsize == 0 488cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && ! read_portion (&dyn_data, &dyn_data_size, dyn_vaddr, dyn_filesz)) 489cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 490cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng union 491cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 492cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf32_Dyn d32[dyn_filesz / sizeof (Elf32_Dyn)]; 493cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf64_Dyn d64[dyn_filesz / sizeof (Elf64_Dyn)]; 494cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } dyn; 495cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 496cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_type = xlateto.d_type = ELF_T_DYN; 497cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_buf = (void *) dyn_data; 498cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlatefrom.d_size = dyn_filesz; 499cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlateto.d_buf = &dyn; 500cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng xlateto.d_size = sizeof dyn; 501cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 502cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (ehdr.e32.e_ident[EI_CLASS] == ELFCLASS32) 503cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 504cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf32_xlatetom (&xlateto, &xlatefrom, 505cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ehdr.e32.e_ident[EI_DATA]) != NULL) 506cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (size_t i = 0; i < dyn_filesz / sizeof dyn.d32[0]; ++i) 507cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (consider_dyn (dyn.d32[i].d_tag, dyn.d32[i].d_un.d_val)) 508cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 509cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 510cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 511cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 512cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf64_xlatetom (&xlateto, &xlatefrom, 513cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ehdr.e32.e_ident[EI_DATA]) != NULL) 514cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (size_t i = 0; i < dyn_filesz / sizeof dyn.d64[0]; ++i) 515cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (consider_dyn (dyn.d64[i].d_tag, dyn.d64[i].d_un.d_val)) 516cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng break; 517cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 518cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 519cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng finish_portion (&dyn_data, &dyn_data_size); 520cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 521cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* We'll use the name passed in or a stupid default if not DT_SONAME. */ 522cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (name == NULL) 523cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng name = ehdr.e32.e_type == ET_EXEC ? "[exe]" : "[dso]"; 524cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 525cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *soname = NULL; 526cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t soname_size = 0; 527cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (dynstrsz != 0 && dynstr_vaddr != 0) 528cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 529cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* We know the bounds of the .dynstr section. */ 530cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dynstr_vaddr += bias; 531cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (unlikely (dynstr_vaddr + dynstrsz > module_end)) 532cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dynstrsz = 0; 533cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 534cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Try to get the DT_SONAME string. */ 535cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (soname_stroff != 0 && soname_stroff < dynstrsz - 1 536cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && ! read_portion (&soname, &soname_size, 537cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng dynstr_vaddr + soname_stroff, 0)) 538cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng name = soname; 539cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 540cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 541cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Now that we have chosen the module's name and bounds, report it. 542cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng If we found a build ID, report that too. */ 543cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 544cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Dwfl_Module *mod = INTUSE(dwfl_report_module) (dwfl, name, 545cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng module_start, module_end); 546cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (likely (mod != NULL) && build_id != NULL 547cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && unlikely (INTUSE(dwfl_module_report_build_id) (mod, 548cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng build_id, 549cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng build_id_len, 550cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng build_id_vaddr))) 551cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 552cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng mod->gc = true; 553cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng mod = NULL; 554cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 555cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 556cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* At this point we do not need BUILD_ID or NAME any more. 557cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng They have been copied. */ 558cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng free (build_id); 559cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng finish_portion (&soname, &soname_size); 560cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 561cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (unlikely (mod == NULL)) 562cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 563cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng ndx = -1; 564cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 565cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 566cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 567cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* We have reported the module. Now let the caller decide whether we 568cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng should read the whole thing in right now. */ 569cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 570cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const GElf_Off cost = (contiguous < file_trimmed_end ? total_filesz 571cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng : buffer_available >= contiguous ? 0 572cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng : contiguous - buffer_available); 573cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const GElf_Off worthwhile = ((dynstr_vaddr == 0 || dynstrsz == 0) ? 0 574cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng : dynstr_vaddr + dynstrsz - start); 575cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const GElf_Off whole = MAX (file_trimmed_end, shdrs_end); 576cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 577cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng Elf *elf = NULL; 578cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if ((*read_eagerly) (MODCB_ARGS (mod), &buffer, &buffer_available, 579cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng cost, worthwhile, whole, contiguous, 580cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng read_eagerly_arg, &elf) 581cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng && elf == NULL) 582cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 583cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* The caller wants to read the whole file in right now, but hasn't 584cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng done it for us. Fill in a local image of the virtual file. */ 585cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 586cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *contents = calloc (1, file_trimmed_end); 587cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (unlikely (contents == NULL)) 588cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 589cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 590cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline void final_read (size_t offset, GElf_Addr vaddr, size_t size) 591cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 592cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng void *into = contents + offset; 593cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng size_t read_size = size; 594cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng (void) segment_read (addr_segndx (dwfl, segment, vaddr), 595cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng &into, &read_size, vaddr, size); 596cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 597cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 598cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (contiguous < file_trimmed_end) 599cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 600cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* We can't use the memory image verbatim as the file image. 601cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng So we'll be reading into a local image of the virtual file. */ 602cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 603cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng inline void read_phdr (GElf_Word type, GElf_Addr vaddr, 604cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng GElf_Off offset, GElf_Xword filesz) 605cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 606cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (type == PT_LOAD) 607cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng final_read (offset, vaddr + bias, filesz); 608cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 609cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 610cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (ehdr.e32.e_ident[EI_CLASS] == ELFCLASS32) 611cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (uint_fast16_t i = 0; i < phnum; ++i) 612cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng read_phdr (phdrs.p32[i].p_type, phdrs.p32[i].p_vaddr, 613cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p32[i].p_offset, phdrs.p32[i].p_filesz); 614cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 615cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng for (uint_fast16_t i = 0; i < phnum; ++i) 616cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng read_phdr (phdrs.p64[i].p_type, phdrs.p64[i].p_vaddr, 617cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng phdrs.p64[i].p_offset, phdrs.p64[i].p_filesz); 618cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 619cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 620cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 621cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* The whole file sits contiguous in memory, 622cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng but the caller didn't want to just do it. */ 623cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 624cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng const size_t have = MIN (buffer_available, file_trimmed_end); 625cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng memcpy (contents, buffer, have); 626cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 627cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (have < file_trimmed_end) 628cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng final_read (have, start + have, file_trimmed_end - have); 629cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 630cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 631cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf = elf_memory (contents, file_trimmed_end); 632cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (unlikely (elf == NULL)) 633cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng free (contents); 634cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng else 635cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng elf->flags |= ELF_F_MALLOCED; 636cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 637cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 638cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng if (elf != NULL) 639cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng { 640cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng /* Install the file in the module. */ 641cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng mod->main.elf = elf; 642cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng mod->main.bias = bias; 643cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng } 644cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng 645cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng return finish (); 646cc6695e2684ce93cdf8bd2da63d55d2cf49ff076Ben Cheng} 647