Re: How to use test-nlist

["Yu, Mingli" <mingli dot yu at windriver dot com>]

On 2019年05月24日 14:36, Yu, Mingli wrote:
> On 2019年05月24日 14:23, Mark Wielaard wrote:
> > On Fri, May 24, 2019 at 11:00:57AM +0800, Yu, Mingli wrote:
> > > On 2019年05月23日 19:50, Mark Wielaard wrote:
> > > > > # ./tests/test-nlist
> > > > > nlist failed
> > > >
> > > > You are supposed to run it with make check.
> > > > make check TESTS=test-nlist
> > > >
> > > > test-nlist tries to run nlist on itself.
> > > > So it has to be in the current working directory.
> > >
> > > Thanks Mark for your respond!
> > > As you said "So it has to be in the current working directory.", what
> > > do you
> > > mean? test-nlist needs to locate in the current working directory?
> >
> > Yes. See the source code.
> > The test tries to run nlist on "./test-nlist".
>
> Which package provides nlist, I didn't found nlist in my system.

Sorry, please ignore this question. I misunderstood just now and thought 
there should be two file nlist and test-nlist need to locate in the 
current working directory.

And I noticed the source code and already run as "./test-nlist", but 
Seems it doesn't work as expected.
# ./test-nlist
# echo $?
1
# ./test-nlist -d
nl[0].n_name = "var"
nl[0].n_value = 0
nl[0].n_scnum = 0
nl[0].n_type = 0
nl[0].n_sclass = 0
nl[0].n_numaux = 0

nl[1].n_name = "bss"
nl[1].n_value = 0
nl[1].n_scnum = 0
nl[1].n_type = 0
nl[1].n_sclass = 0
nl[1].n_numaux = 0

nl[2].n_name = "main"
nl[2].n_value = 0
nl[2].n_scnum = 0
nl[2].n_type = 0
nl[2].n_sclass = 0
nl[2].n_numaux = 0

nl[3].n_name = "foo"
nl[3].n_value = 0
nl[3].n_scnum = 0
nl[3].n_type = 0
nl[3].n_sclass = 0
nl[3].n_numaux = 0

nl[4].n_name = "not-there"
nl[4].n_value = 0
nl[4].n_scnum = 0
nl[4].n_type = 0
nl[4].n_sclass = 0
nl[4].n_numaux = 0
# echo $?
1

Thanks,

> Thanks,
>
> > > > Basically nlist fills in the n_value and n_scnum with the st_value and
> > > > st_shndx of the symbol named if found.
> > > >
> > > > As you can see for me it corresponds to the values found by:
> > > >
> > > > $ eu-readelf -s ./test-nlist | egrep ' (var|bss|main|foo)'
> > > >      58: 0000000000004048      4 OBJECT  GLOBAL DEFAULT       24 var
> > > >      61: 0000000000004050      4 OBJECT  GLOBAL DEFAULT       25 bss
> > > >      66: 0000000000001310      3 FUNC    GLOBAL DEFAULT       14 foo
> > > >      71: 0000000000001080    408 FUNC    GLOBAL DEFAULT       14 main
> > >
> > > # which eu-readelf
> > > /usr/bin/eu-readelf
> > >
> > > # /usr/bin/eu-readelf -s tests/test-nlist
> > > Symbol table [ 5] '.dynsym' contains 11 entries:
> > >   1 local symbol  String table: [ 6] '.dynstr'
> > >    Num:            Value   Size Type    Bind   Vis          Ndx Name
> > >      0: 0000000000000000      0 NOTYPE  LOCAL  DEFAULT    UNDEF
> > >      1: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
> > > _ITM_deregisterTMCloneTable
> > >      2: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> > > puts@GLIBC_2.2.5 (2)
> > >      3: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> > > __stack_chk_fail@GLIBC_2.4 (3)
> > >      4: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> > > __libc_start_main@GLIBC_2.2.5 (2)
> > >      5: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
> > > __gmon_start__
> > >      6: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> > > nlist@ELFUTILS_1.0 (4)
> > >      7: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> > > __printf_chk@GLIBC_2.3.4 (5)
> > >      8: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> > > exit@GLIBC_2.2.5 (2)
> > >      9: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
> > > _ITM_registerTMCloneTable
> > >     10: 0000000000000000      0 FUNC    WEAK   DEFAULT    UNDEF
> > > __cxa_finalize@GLIBC_2.2.5 (2)
> >
> > For some reason your test-nlist doesn't have an .symtab.
> > Make sure that when you build the tests CLFAGS contains -g.
> > And the that test binary isn't accidentially stripped afterwards.
> >
> > Cheers,
> >
> > Mark