mirror of
https://github.com/dynup/kpatch
synced 2024-12-23 13:42:09 +00:00
adcd4581cc
Introduce a common kpatch elf api by moving all functions and struct
declarations related to manipulating kpatch_elf objects from
create-diff-object to kpatch-elf.{h,c}. Move logging macros to a separate
file log.h, and have kpatch-elf.h include it. These changes will generalize
the kpatch-elf and logging api and make it available to other kpatch-build
tools.
151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/*
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* kpatch-elf.h
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA,
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* 02110-1301, USA.
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*/
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#ifndef _KPATCH_ELF_H_
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#define _KPATCH_ELF_H_
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#include <gelf.h>
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#include "list.h"
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#include "log.h"
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/*******************
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* Data structures
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* ****************/
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struct section;
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struct symbol;
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struct rela;
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enum status {
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NEW,
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CHANGED,
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SAME
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};
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struct section {
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struct list_head list;
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struct section *twin;
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GElf_Shdr sh;
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Elf_Data *data;
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char *name;
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int index;
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enum status status;
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int include;
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int ignore;
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int grouped;
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union {
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struct { /* if (is_rela_section()) */
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struct section *base;
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struct list_head relas;
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};
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struct { /* else */
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struct section *rela;
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struct symbol *secsym, *sym;
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};
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};
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};
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struct symbol {
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struct list_head list;
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struct symbol *twin;
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struct section *sec;
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GElf_Sym sym;
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char *name;
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int index;
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unsigned char bind, type;
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enum status status;
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union {
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int include; /* used in the patched elf */
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int strip; /* used in the output elf */
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};
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int has_fentry_call;
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};
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struct rela {
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struct list_head list;
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GElf_Rela rela;
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struct symbol *sym;
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unsigned int type;
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int addend;
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int offset;
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char *string;
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};
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struct string {
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struct list_head list;
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char *name;
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};
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struct kpatch_elf {
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Elf *elf;
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struct list_head sections;
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struct list_head symbols;
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struct list_head strings;
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int fd;
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};
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/*******************
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* Helper functions
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******************/
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char *status_str(enum status status);
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int is_rela_section(struct section *sec);
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int is_text_section(struct section *sec);
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int is_debug_section(struct section *sec);
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struct section *find_section_by_index(struct list_head *list, unsigned int index);
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struct section *find_section_by_name(struct list_head *list, const char *name);
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struct symbol *find_symbol_by_index(struct list_head *list, size_t index);
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struct symbol *find_symbol_by_name(struct list_head *list, const char *name);
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#define ALLOC_LINK(_new, _list) \
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{ \
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(_new) = malloc(sizeof(*(_new))); \
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if (!(_new)) \
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ERROR("malloc"); \
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memset((_new), 0, sizeof(*(_new))); \
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INIT_LIST_HEAD(&(_new)->list); \
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list_add_tail(&(_new)->list, (_list)); \
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}
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int offset_of_string(struct list_head *list, char *name);
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/*************
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* Functions
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* **********/
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void kpatch_create_rela_list(struct kpatch_elf *kelf, struct section *sec);
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void kpatch_create_section_list(struct kpatch_elf *kelf);
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void kpatch_create_symbol_list(struct kpatch_elf *kelf);
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struct kpatch_elf *kpatch_elf_open(const char *name);
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void kpatch_dump_kelf(struct kpatch_elf *kelf);
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int is_null_sym(struct symbol *sym);
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int is_file_sym(struct symbol *sym);
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int is_local_func_sym(struct symbol *sym);
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int is_local_sym(struct symbol *sym);
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void print_strtab(char *buf, size_t size);
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void kpatch_create_shstrtab(struct kpatch_elf *kelf);
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void kpatch_create_strtab(struct kpatch_elf *kelf);
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void kpatch_create_symtab(struct kpatch_elf *kelf);
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struct section *create_section_pair(struct kpatch_elf *kelf, char *name,
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int entsize, int nr);
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void kpatch_write_output_elf(struct kpatch_elf *kelf, Elf *elf, char *outfile);
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void kpatch_elf_teardown(struct kpatch_elf *kelf);
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void kpatch_elf_free(struct kpatch_elf *kelf);
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#endif /* _KPATCH_ELF_H_ */
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