Roland
Thanks a lot for responding to the query, excuse me for the late
response. loc2c-test.c succeeds ,on the same machine, and I am able to
see the expected out put, but the sample test code I am using still
fails. Excuse me to ask you to look into my code but I am still not
convinced that library is not to blame.
This is the system information
OS: Red Hat Enterprise Linux Server release 5.2 (Tikanga)
Kernel: 2.6.18-92.el5
elfutils: elfutils-0.139
arch: x86_64
I am attaching the sample code that I am using for testing. This is what
I get while testing:
-----------------------------------------------
./read_cu -e ../vmlinux 0xffffffff800aa956
nscopes: -1 dwarf_getscopes error:no error
nscopes: 0 dwarf_getscopes error:no error
-----------------------------------------------
This is the system detail on which I tested
Roland McGrath wrote:
Please point us to an exact kernel binary (e.g. precise Fedora rpm version)
and PC to try in it. Note that a handy test program for this is built in
systemtap, called "loc2c-test". (That's what I'll likely use to debug the
case myself.)
Thanks,
Roland
#include <stdio.h>
#include <libdw.h>
#include <libdwfl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <dwarf.h>
#include <string.h>
#include <inttypes.h>
#include <argp.h>
int main(int argc, char **argv)
{
Dwfl *dwfl = NULL;
Dwarf_Addr cubias;
Dwarf_Die *scopes, *cu_die;
uintmax_t pc;
int argi = 0, nscopes;
char *endp;
argp_parse (dwfl_standard_argp (), argc, argv, 0, &argi, &dwfl);
if ( !dwfl )
printf("\n dwfl null");
pc = strtoumax(argv[argi], &endp,0);
cu_die = dwfl_addrdie (dwfl, pc, &cubias);
if (!cu_die)
printf("\n cu_die is null");
nscopes = dwarf_getscopes(cu_die, pc - cubias, &scopes);
if(nscopes < 0)
printf ("\n nscopes: %d dwarf_getscopes error:%s", nscopes, dwarf_errmsg(-1));
nscopes = dwarf_getscopes_die(cu_die, &scopes);
printf ("\n nscopes: %d dwarf_getscopes error:%s", nscopes, dwarf_errmsg(-1));
printf("\n");
return 0;
}
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