1b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper/* Append new section. 21ccdfb683ad6c7e59793136c3a657ddf131cafd1Mark Wielaard Copyright (C) 1998,1999,2000,2001,2002,2005,2009,2014,2015 Red Hat, Inc. 3de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard This file is part of elfutils. 4b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Written by Ulrich Drepper <drepper@redhat.com>, 1998. 5b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 6de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard This file is free software; you can redistribute it and/or modify 7de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard it under the terms of either 8b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 9de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard * the GNU Lesser General Public License as published by the Free 10de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard Software Foundation; either version 3 of the License, or (at 11de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard your option) any later version 12de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 13de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard or 14de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 15de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard * the GNU General Public License as published by the Free 16de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard Software Foundation; either version 2 of the License, or (at 17de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard your option) any later version 18de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 19de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard or both in parallel, as here. 20de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 21de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard elfutils is distributed in the hope that it will be useful, but 22361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper WITHOUT ANY WARRANTY; without even the implied warranty of 23361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper General Public License for more details. 25b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 26de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard You should have received copies of the GNU General Public License and 27de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard the GNU Lesser General Public License along with this program. If 28de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard not, see <http://www.gnu.org/licenses/>. */ 29b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 30b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#ifdef HAVE_CONFIG_H 31b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper# include <config.h> 32b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#endif 33b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 34b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <assert.h> 35b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <stdbool.h> 36b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <stddef.h> 37b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <stdlib.h> 38b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <string.h> 39b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 40b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include "libelfP.h" 41b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 42b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 43b08d5a8fb42f4586d756068065186b5af7e48daUlrich DrepperElf_Scn * 441ccdfb683ad6c7e59793136c3a657ddf131cafd1Mark Wielaardelf_newscn (Elf *elf) 45b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper{ 46b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Elf_Scn *result = NULL; 47b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper bool first = false; 48b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 49b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (elf == NULL) 50b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper return NULL; 51b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 52b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* We rely on the prefix of the `elf', `elf32', and `elf64' element 53b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper being the same. */ 54b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper assert (offsetof (Elf, state.elf.scns_last) 55b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper == offsetof (Elf, state.elf32.scns_last)); 56b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper assert (offsetof (Elf, state.elf.scns_last) 57b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper == offsetof (Elf, state.elf64.scns_last)); 58b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper assert (offsetof (Elf, state.elf32.scns) 59b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper == offsetof (Elf, state.elf64.scns)); 60b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 61b4d6f0f8064f2b706ea9035ef0393d8299671390Roland McGrath rwlock_wrlock (elf->lock); 62b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 63b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper again: 64b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (elf->state.elf.scns_last->cnt < elf->state.elf.scns_last->max) 65b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 66b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result = &elf->state.elf.scns_last->data[elf->state.elf.scns_last->cnt]; 67b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 68b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (++elf->state.elf.scns_last->cnt == 1 69b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper && (elf->state.elf.scns_last 70b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper == (elf->class == ELFCLASS32 71b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper || (offsetof (Elf, state.elf32.scns) 72b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper == offsetof (Elf, state.elf64.scns)) 73b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper ? &elf->state.elf32.scns : &elf->state.elf64.scns))) 74b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* This is zeroth section. */ 75b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper first = true; 76b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else 77b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 78b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper assert (elf->state.elf.scns_last->cnt > 1); 79b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->index = result[-1].index + 1; 80b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 81b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 82b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else 83b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 84b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* We must allocate a new element. */ 85720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek Elf_ScnList *newp = NULL; 86b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 87b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper assert (elf->state.elf.scnincr > 0); 88b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 89720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek if ( 90720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek#if SIZE_MAX <= 4294967295U 91720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek likely (elf->state.elf.scnincr 92720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek < SIZE_MAX / 2 / sizeof (Elf_Scn) - sizeof (Elf_ScnList)) 93720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek#else 94720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek 1 95720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek#endif 96720383c53b435de6647edd78060dd7d38ade25a5Jakub Jelinek ) 97b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper newp = (Elf_ScnList *) calloc (sizeof (Elf_ScnList) 98b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper + ((elf->state.elf.scnincr *= 2) 99b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper * sizeof (Elf_Scn)), 1); 100b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (newp == NULL) 101b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 102b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libelf_seterrno (ELF_E_NOMEM); 103b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper goto out; 104b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 105b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 106b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result = &newp->data[0]; 107b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 108b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* One section used. */ 109b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper ++newp->cnt; 110b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 111b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* This is the number of sections we allocated. */ 112b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper newp->max = elf->state.elf.scnincr; 113b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 114b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Remember the index for the first section in this block. */ 115b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper newp->data[0].index 116b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper = 1 + elf->state.elf.scns_last->data[elf->state.elf.scns_last->max - 1].index; 117b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 118b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Enqueue the new list element. */ 119b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper elf->state.elf.scns_last = elf->state.elf.scns_last->next = newp; 120b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 121b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 122b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Create a section header for this section. */ 123b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (elf->class == ELFCLASS32) 124b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 125b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->shdr.e32 = (Elf32_Shdr *) calloc (1, sizeof (Elf32_Shdr)); 126b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (result->shdr.e32 == NULL) 127b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 128b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libelf_seterrno (ELF_E_NOMEM); 129b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper goto out; 130b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 131b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 132b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else 133b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 134b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->shdr.e64 = (Elf64_Shdr *) calloc (1, sizeof (Elf64_Shdr)); 135b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (result->shdr.e64 == NULL) 136b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 137b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libelf_seterrno (ELF_E_NOMEM); 138b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper goto out; 139b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 140b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 141b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 142b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->elf = elf; 143b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->shdr_flags = ELF_F_DIRTY | ELF_F_MALLOCED; 144b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->list = elf->state.elf.scns_last; 145b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 146b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Initialize the data part. */ 147b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->data_read = 1; 148b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (unlikely (first)) 149b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 150b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* For the first section we mark the data as already available. */ 151b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper //result->data_list_rear = &result->data_list; 152b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper first = false; 153b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper goto again; 154b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 155b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 156b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result->flags |= ELF_F_DIRTY; 157b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 158b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper out: 159b4d6f0f8064f2b706ea9035ef0393d8299671390Roland McGrath rwlock_unlock (elf->lock); 160b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 161b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper return result; 162b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper} 163