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- Added dladdr(3) support.

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Reviewed by:	jdp@FreeBSD.org
This commit is contained in:
Nate Williams 1999-03-24 23:37:35 +00:00
parent b56fecc80b
commit e818e307ee
1 changed files with 47 additions and 1 deletions
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48
libexec/rtld-elf/rtld.c
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@ -22,7 +22,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: rtld.c,v 1.12 1998/10/13 03:31:59 jdp Exp $
* $Id: rtld.c,v 1.13 1998/11/27 21:19:52 dfr Exp $
*/
/*
@ -148,6 +148,7 @@ static func_ptr_type exports[] = {
(func_ptr_type) &dlerror,
(func_ptr_type) &dlopen,
(func_ptr_type) &dlsym,
(func_ptr_type) &dladdr,
NULL
};
@ -1259,6 +1260,51 @@ dlsym(void *handle, const char *name)
return NULL;
}
int
dladdr(const void *addr, Dl_info *info)
{
const Obj_Entry *obj;
const Elf_Sym *def;
void *symbol_addr;
unsigned long symoffset;
obj = obj_from_addr(addr);
if (obj == NULL) {
_rtld_error("No shared object contains address");
return 0;
}
info->dli_fname = obj->path;
info->dli_fbase = obj->relocbase;
info->dli_saddr = (void *)0;
info->dli_sname = NULL;
/*
* Walk the symbol list looking for the symbol whosse address is
* closest to the address sent in.
*/
for (symoffset = 0; symoffset < obj->nchains; symoffset++) {
def = obj->symtab + symoffset;
symbol_addr = obj->relocbase + def->st_value;
/*
*If the symbol is greater than the specified address, or if it
* is further away from addr than the current nearest symbol,
* then reject it.
*/
if (symbol_addr > addr ||
symbol_addr < info->dli_saddr)
continue;
/* Update our idea of the nearest symbol. */
info->dli_sname = obj->strtab + def->st_name;
info->dli_saddr = symbol_addr;
/* Exact match? */
if (info->dli_saddr == addr)
break;
}
return 1;
}
static void
linkmap_add(Obj_Entry *obj)
{