query related valgrind usage in arm board with i686 arch

[vlrk]

Hi Team,

We are using arm board of i686 arch .

I got valgrind cross compiled using the arm toolchain of i386 ( vendor given).

We observe for two of the packages could able to run with valgrind .

where as with others I get below error .

valgrind: Fatal error at startup: a function redirection
valgrind: which is mandatory for this platform-tool combination
valgrind: cannot be set up. Details of the redirection are:
valgrind:
valgrind: A must-be-redirected function
valgrind: whose name matches the pattern: index
valgrind: in an object with soname matching: ld-linux.so.3
valgrind: was not found whilst processing
valgrind: symbols from the object with soname: ld-linux.so.3
valgrind:
valgrind: Possible fixes: (1, short term): install glibc's debuginfo
valgrind: package on this machine. (2, longer term): ask the packagers
valgrind: for your Linux distribution to please in future ship a non-
valgrind: stripped ld.so (or whatever the dynamic linker .so is called)
valgrind: that exports the above-named function using the standard
valgrind: calling conventions for this platform. The package you need
valgrind: to install for fix (1) is called
valgrind:
valgrind: On Debian, Ubuntu: libc6-dbg
valgrind: On SuSE, openSuSE, Fedora, RHEL: glibc-debuginfo
valgrind:
valgrind: Note that if you are debugging a 32 bit process on a
valgrind: 64 bit system, you will need a corresponding 32 bit debuginfo
valgrind: package (e.g. libc6-dbg:i386).
valgrind:
valgrind: Cannot continue -- exiting now. Sorry.


In above I see like when I do readelf -S ./lib/libc.so.6

[63] .debug_aranges PROGBITS 00000000 131558 000240 00 0 0 8
[64] .debug_info PROGBITS 00000000 131798 001571 00 0 0 1
[65] .debug_abbrev PROGBITS 00000000 132d09 0003dd 00 0 0 1
[66] .debug_line PROGBITS 00000000 1330e6 000e17 00 0 0 1
[67] .debug_frame PROGBITS 00000000 133f00 002608 00 0 0 4
[68] .debug_str PROGBITS 00000000 136508 0012f8 01 MS 0 0 1
[69] .debug_loc PROGBITS 00000000 137800 00039b 00 0 0 1

I belive debug symbols are present


In my target board we have busybox binary , this works very fine with valgrind.

I mean if "ld-linux.so.3 needs to have symbols" ,does this mean busy box does not use this linker / loader?.

Where as for others it gives error as shown before?.

when I do readelf -S /lib/ld-linux.so.3 , it shows

[21] .debug_aranges PROGBITS 00000000 0218f0 0000a0 00 0 0 8
[22] .debug_info PROGBITS 00000000 021990 000a81 00 0 0 1
[23] .debug_abbrev PROGBITS 00000000 022411 0001b2 00 0 0 1
[24] .debug_line PROGBITS 00000000 0225c3 00037f 00 0 0 1
[25] .debug_frame PROGBITS 00000000 022944 000608 00 0 0 4
[26] .debug_str PROGBITS 00000000 022f4c 0011cf 01 MS 0 0 1
[27] .debug_loc PROGBITS 00000000 02411b 0002fb 00 0 0 1

Will this confirm like it has debugging symbols.

Not sure enough , what exactly missing , Any inputs in this will be highly appreciated.

Thanks
vlrk

[Salem]

$ nm -D /lib/x86_64-linux-gnu/libc.so.6 | grep index
00000000000a82e0 i index@@GLIBC_2.2.5
00000000000a89e0 i rindex@@GLIBC_2.2.5

Use nm to list the dynamic symbols.

Also, index is in libc, so I've no idea why it's complaining about not being able to find in ld-linux.so.3

> We are using arm board of i686 arch .
> I got valgrind cross compiled using the arm toolchain of i386 ( vendor given).
Unless as the error message hints, it's a 32/64 bit mix-up.

What does 'file' report for the program you're trying to valgrind?

$ file /bin/ls
/bin/ls: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2

[vlrk]

Thanks salem,

Below is the nm and file related output.

[labuser@141179 lib]$ nm libc.so.6 | grep index
000f0e30 t decrement_at_index.part.0
000ea7c0 t __GI___if_freenameindex
000ea7c0 t __GI_if_freenameindex
000eaacc t __GI_if_indextoname
000ea7fc t __GI_if_nameindex
000ea6f0 t __GI___if_nametoindex
000ea6f0 t __GI_if_nametoindex
000ea7c0 t __if_freenameindex
000ea7c0 W if_freenameindex
000eaacc t __if_indextoname
000eaacc W if_indextoname
000ea7fc t __if_nameindex
000ea7fc W if_nameindex
000ea6f0 t __if_nametoindex
000ea6f0 W if_nametoindex
00075d20 W index
00076c10 W rindex

file lighttpd
lighttpd: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 4.19.0, not stripped

may be as it shows , I should get libc6-dbg:i386 and provide this info to valgrind .
Need to find a way , on getting this.

Thanks
vlrk