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libkldelf: add elf_lookup_symbol function

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The elf_lookup_symbol function looks up the symbol with a given symbol
name. A pointer to the GElf_Sym of the symbol is returned if the symbol
exists in the opened ELF file.

Sponsored by:	Juniper Networks, Inc.
Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D46764
This commit is contained in:
Ka Ho Ng 2024-10-08 04:24:37 +00:00
parent 0a2cfd653e
commit 2c7d847956
4 changed files with 21 additions and 0 deletions
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1
lib/libkldelf/ef.c
View File

@ -89,6 +89,7 @@ static struct elf_file_ops ef_file_ops = {
.seg_read_string = ef_seg_read_string,
.symaddr = ef_symaddr,
.lookup_set = ef_lookup_set,
.lookup_symbol = ef_lookup_symbol,
};
static void

1
lib/libkldelf/ef_obj.c
View File

@ -109,6 +109,7 @@ static struct elf_file_ops ef_obj_file_ops = {
.seg_read_string = ef_obj_seg_read_string,
.symaddr = ef_obj_symaddr,
.lookup_set = ef_obj_lookup_set,
.lookup_symbol = ef_obj_lookup_symbol,
};
static GElf_Off

6
lib/libkldelf/elf.c
View File

@ -686,3 +686,9 @@ elf_reloc(struct elf_file *efile, const void *reldata, Elf_Type reltype,
return (efile->ef_reloc(efile, reldata, reltype, relbase, dataoff, len,
dest));
}
int
elf_lookup_symbol(struct elf_file *efile, const char *name, GElf_Sym **sym)
{
return (EF_LOOKUP_SYMBOL(efile, name, sym));
}

13
lib/libkldelf/kldelf.h
View File

@ -48,6 +48,8 @@
(ef)->ef_ops->symaddr((ef)->ef_ef, symidx)
#define EF_LOOKUP_SET(ef, name, startp, stopp, countp) \
(ef)->ef_ops->lookup_set((ef)->ef_ef, name, startp, stopp, countp)
#define EF_LOOKUP_SYMBOL(ef, name, sym) \
(ef)->ef_ops->lookup_symbol((ef)->ef_ef, name, sym)
/* XXX, should have a different name. */
typedef struct ef_file *elf_file_t;
@ -67,6 +69,7 @@ struct elf_file_ops {
GElf_Addr (*symaddr)(elf_file_t ef, GElf_Size symidx);
int (*lookup_set)(elf_file_t ef, const char *name, GElf_Addr *startp,
GElf_Addr *stopp, long *countp);
int (*lookup_symbol)(elf_file_t ef, const char *name, GElf_Sym **sym);
};
typedef int (elf_reloc_t)(struct elf_file *ef, const void *reldata,
@ -310,6 +313,16 @@ int elf_read_mod_pnp_match_info(struct elf_file *efile, GElf_Addr addr,
int elf_reloc(struct elf_file *ef, const void *reldata, Elf_Type reltype,
GElf_Addr relbase, GElf_Addr dataoff, size_t len, void *dest);
/*
* Find the symbol with the specified symbol name 'name' within the given
* 'efile'. 0 is returned when such a symbol is found, otherwise ENOENT is
* returned.
*
* XXX: This only return the first symbol being found when traversing symtab.
*/
int elf_lookup_symbol(struct elf_file *efile, const char *name,
GElf_Sym **sym);
__END_DECLS
#endif /* _KLDELF_H_*/