diff options
Diffstat (limited to 'libelf/elf_newscn.c')
| -rw-r--r-- | libelf/elf_newscn.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/libelf/elf_newscn.c b/libelf/elf_newscn.c new file mode 100644 index 00000000..f3ea0d80 --- /dev/null +++ b/libelf/elf_newscn.c @@ -0,0 +1,143 @@ +/* Append new section. + Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. + Written by Ulrich Drepper <drepper@redhat.com>, 1998. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, version 2. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <assert.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdlib.h> +#include <string.h> + +#include "libelfP.h" + + +Elf_Scn * +elf_newscn (elf) + Elf *elf; +{ + Elf_Scn *result = NULL; + bool first = false; + + if (elf == NULL) + return NULL; + + /* We rely on the prefix of the `elf', `elf32', and `elf64' element + being the same. */ + assert (offsetof (Elf, state.elf.scns_last) + == offsetof (Elf, state.elf32.scns_last)); + assert (offsetof (Elf, state.elf.scns_last) + == offsetof (Elf, state.elf64.scns_last)); + assert (offsetof (Elf, state.elf32.scns) + == offsetof (Elf, state.elf64.scns)); + + rwlock_wrlock (elf->lock); + + again: + if (elf->state.elf.scns_last->cnt < elf->state.elf.scns_last->max) + { + result = &elf->state.elf.scns_last->data[elf->state.elf.scns_last->cnt]; + + if (++elf->state.elf.scns_last->cnt == 1 + && (elf->state.elf.scns_last + == (elf->class == ELFCLASS32 + || (offsetof (Elf, state.elf32.scns) + == offsetof (Elf, state.elf64.scns)) + ? &elf->state.elf32.scns : &elf->state.elf64.scns))) + /* This is zeroth section. */ + first = true; + else + { + assert (elf->state.elf.scns_last->cnt > 1); + result->index = result[-1].index + 1; + } + } + else + { + /* We must allocate a new element. */ + Elf_ScnList *newp; + + assert (elf->state.elf.scnincr > 0); + + newp = (Elf_ScnList *) calloc (sizeof (Elf_ScnList) + + ((elf->state.elf.scnincr *= 2) + * sizeof (Elf_Scn)), 1); + if (newp == NULL) + { + __libelf_seterrno (ELF_E_NOMEM); + goto out; + } + + result = &newp->data[0]; + + /* One section used. */ + ++newp->cnt; + + /* This is the number of sections we allocated. */ + newp->max = elf->state.elf.scnincr; + + /* Remember the index for the first section in this block. */ + newp->data[0].index + = 1 + elf->state.elf.scns_last->data[elf->state.elf.scns_last->max - 1].index; + + /* Enqueue the new list element. */ + elf->state.elf.scns_last = elf->state.elf.scns_last->next = newp; + } + + /* Create a section header for this section. */ + if (elf->class == ELFCLASS32) + { + result->shdr.e32 = (Elf32_Shdr *) calloc (1, sizeof (Elf32_Shdr)); + if (result->shdr.e32 == NULL) + { + __libelf_seterrno (ELF_E_NOMEM); + goto out; + } + } + else + { + result->shdr.e64 = (Elf64_Shdr *) calloc (1, sizeof (Elf64_Shdr)); + if (result->shdr.e64 == NULL) + { + __libelf_seterrno (ELF_E_NOMEM); + goto out; + } + } + + result->elf = elf; + result->shdr_flags = ELF_F_DIRTY | ELF_F_MALLOCED; + result->list = elf->state.elf.scns_last; + + /* Initialize the data part. */ + result->data_read = 1; + if (unlikely (first)) + { + /* For the first section we mark the data as already available. */ + //result->data_list_rear = &result->data_list; + first = false; + goto again; + } + + result->flags |= ELF_F_DIRTY; + + out: + rwlock_unlock (elf->lock); + + return result; +} |