140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
/* Append new section.
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Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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Written by Ulrich Drepper <drepper@redhat.com>, 1998.
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This program is Open Source software; you can redistribute it and/or
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modify it under the terms of the Open Software License version 1.0 as
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published by the Open Source Initiative.
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You should have received a copy of the Open Software License along
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with this program; if not, you may obtain a copy of the Open Software
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License version 1.0 from http://www.opensource.org/licenses/osl.php or
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by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
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3001 King Ranch Road, Ukiah, CA 95482. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <assert.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libelfP.h"
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Elf_Scn *
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elf_newscn (Elf *elf)
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{
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Elf_Scn *result = NULL;
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bool first = false;
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if (elf == NULL)
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return NULL;
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/* We rely on the prefix of the `elf', `elf32', and `elf64' element
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being the same. */
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assert (offsetof (Elf, state.elf.scns_last)
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== offsetof (Elf, state.elf32.scns_last));
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assert (offsetof (Elf, state.elf.scns_last)
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== offsetof (Elf, state.elf64.scns_last));
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assert (offsetof (Elf, state.elf32.scns)
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== offsetof (Elf, state.elf64.scns));
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rwlock_wrlock (elf->lock);
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again:
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if (elf->state.elf.scns_last->cnt < elf->state.elf.scns_last->max)
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{
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result = &elf->state.elf.scns_last->data[elf->state.elf.scns_last->cnt];
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if (++elf->state.elf.scns_last->cnt == 1
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&& (elf->state.elf.scns_last
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== (elf->class == ELFCLASS32
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|| (offsetof (Elf, state.elf32.scns)
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== offsetof (Elf, state.elf64.scns))
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? &elf->state.elf32.scns : &elf->state.elf64.scns)))
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/* This is zeroth section. */
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first = true;
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else
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{
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assert (elf->state.elf.scns_last->cnt > 1);
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result->index = result[-1].index + 1;
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}
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}
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else
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{
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/* We must allocate a new element. */
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Elf_ScnList *newp;
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assert (elf->state.elf.scnincr > 0);
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newp = (Elf_ScnList *) calloc (sizeof (Elf_ScnList)
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+ ((elf->state.elf.scnincr *= 2)
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* sizeof (Elf_Scn)), 1);
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if (newp == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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result = &newp->data[0];
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/* One section used. */
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++newp->cnt;
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/* This is the number of sections we allocated. */
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newp->max = elf->state.elf.scnincr;
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/* Remember the index for the first section in this block. */
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newp->data[0].index
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= 1 + elf->state.elf.scns_last->data[elf->state.elf.scns_last->max - 1].index;
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/* Enqueue the new list element. */
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elf->state.elf.scns_last = elf->state.elf.scns_last->next = newp;
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}
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/* Create a section header for this section. */
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if (elf->class == ELFCLASS32)
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{
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result->shdr.e32 = (Elf32_Shdr *) calloc (1, sizeof (Elf32_Shdr));
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if (result->shdr.e32 == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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}
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else
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{
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result->shdr.e64 = (Elf64_Shdr *) calloc (1, sizeof (Elf64_Shdr));
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if (result->shdr.e64 == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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}
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result->elf = elf;
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result->shdr_flags = ELF_F_DIRTY | ELF_F_MALLOCED;
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result->list = elf->state.elf.scns_last;
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/* Initialize the data part. */
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result->data_read = 1;
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if (unlikely (first))
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{
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/* For the first section we mark the data as already available. */
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//result->data_list_rear = &result->data_list;
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first = false;
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goto again;
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}
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result->flags |= ELF_F_DIRTY;
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out:
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rwlock_unlock (elf->lock);
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return result;
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}
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