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kpatch/kpatch-build/lookup.h

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merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
#ifndef _LOOKUP_H_
#define _LOOKUP_H_
lookup: convert lookup functions to return bool IMO, the code is easier to follow if these functions return bool. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-11-01 19:59:05 +00:00
#include <stdbool.h>
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
struct lookup_table;
struct lookup_result {
lookup: rename 'value' -> 'addr' Rename 'value' to 'addr' to more accurately describe it. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
2018-04-18 18:39:56 +00:00
unsigned long addr;
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
unsigned long size;
lookup: rename 'pos' to 'sympos' To more accurately describe its purpose. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
2018-04-18 18:41:24 +00:00
unsigned long sympos;
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
};
support dup file+symbol We use kelf_base->symbols to find a unique matching FILE+locals combination when we call lookup_open(). If we can't find one matching or we find more than one matching, we error out. If we find a unique one, we setup table->local_syms in lookup_open(), so later lookup_local_symbol() could do its lookup based on table->local_syms. Fixes #604. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
2017-02-04 01:31:25 +00:00
struct sym_compare_type {
char *name;
int type;
};
kpatch-build: use symbol table instead of kobject create-diff-object doesn't really need the full kernel object file as input. All it requires is a symbol table. Switch to using "eu-readelf -s"'s output instead of object files. This will enable us to cover more cases in unit tests. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Artem Savkov <asavkov@redhat.com>
2018-05-11 09:51:00 +00:00
struct lookup_table *lookup_open(char *symtab_path, char *symvers_path,
support dup file+symbol We use kelf_base->symbols to find a unique matching FILE+locals combination when we call lookup_open(). If we can't find one matching or we find more than one matching, we error out. If we find a unique one, we setup table->local_syms in lookup_open(), so later lookup_local_symbol() could do its lookup based on table->local_syms. Fixes #604. Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
2017-02-04 01:31:25 +00:00
char *hint, struct sym_compare_type *locals);
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
void lookup_close(struct lookup_table *table);
lookup: convert lookup functions to return bool IMO, the code is easier to follow if these functions return bool. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
2019-11-01 19:59:05 +00:00
bool lookup_local_symbol(struct lookup_table *table, char *name,
struct lookup_result *result);
bool lookup_global_symbol(struct lookup_table *table, char *name,
struct lookup_result *result);
bool lookup_is_exported_symbol(struct lookup_table *table, char *name);
lookup: parse Module.symvers in lookup_open() Have lookup_open() also parse Module.symvers and add the resulting symbols and their objnames to the lookup table. This code was essentially cherry-picked from Josh Poimboeuf's lookup code found here: https://github.com/jpoimboe/kpatch/commit/8cdca59c8844505bcf40b59b5c5050b03e974fea That patch was modified to fix a bug in obj_read() (calling elf_end() without strdup'ing the symbol name strings, which was causing null dereferences) and to fix up the module name after reading it from Module.symvers (replacing '-' with '_' and stripping the path prefixes). Also, add lookup_exported_symbol_objname(), which looks up the objname of an exported symbol by making use of the objname information obtained from Module.symvers.
2017-01-23 20:43:12 +00:00
char *lookup_exported_symbol_objname(struct lookup_table *table, char *name);
merge add-patches-section functionality into create-obj-diff In preparation for dynamic symbol linking, the symbol lookup logic is going to move into create-diff-obj anyway. We might as well minimize the code duplication and pull this into create-diff-obj. This avoids having to re-parse the ELF file modify it in-place. Signed-off-by: Seth Jennings <sjenning@redhat.com> Conflicts: kpatch-build/kpatch-build
2014-05-14 20:43:58 +00:00
#endif /* _LOOKUP_H_ */