Re: debug problem with prelinked libraries

[Thomas Schwinge <thomas@codesourcery.com>]

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Hello!

On 2010-05-07 13:23, Jan Kratochvil wrote:
> On Wed, 05 May 2010 16:59:36 +0200, Andrew Stubbs wrote:
>> > prelink includes code to manipulate the contents of the debug info.
> [...]
>> Maybe prelink has failed to relocate the debug info in this case?
>
> The attached patch should fix it.
>
> Although SHT_MIPS_DWARF value should be recognized only for e_machine as
> EM_MIPS or EM_MIPS_RS3_LE or EM_MIPS_X?  Or are there some other rules?

> --- prelink/src/dso.c-orig	2010-04-13 16:41:15.000000000 +0200
> +++ prelink/src/dso.c	2010-05-07 15:16:25.000000000 +0200
> @@ -1381,6 +1381,7 @@ adjust_dso (DSO *dso, GElf_Addr start, G
>        switch (dso->shdr[i].sh_type)
>  	{
>  	case SHT_PROGBITS:
> +	case SHT_MIPS_DWARF:
>  	  name = strptr (dso, dso->ehdr.e_shstrndx, dso->shdr[i].sh_name);
>  	  if (strcmp (name, ".stab") == 0
>  	      && adjust_stabs (dso, i, start, adjust))

Unfortunately, this patch causes the following regression for about every
test of the prelink testsuite, in -mabi=64 configurations (only):

    mips-wrs-linux-gnu-prelink -c ./prelink.conf -C ./prelink.cache --ld-library-path=. --dynamic-linker=./ld.so.1 -vm ./reloc1
    Laying out 4 libraries in virtual address space 0000005800000000-0000009800000000
    Assigned virtual address space slots for libraries:
    ./ld.so.1                                                    0000005800000000-0000005800032328
    ./libc.so.6                                                  0000005800040000-00000058001cbdb0
    ./reloc1lib1.so                                              00000058001d0000-00000058001e0b10
    ./reloc1lib2.so                                              00000058001f0000-00000058002009d0
    Prelinking /scratch/thomas/issue8927/obj/test-4.3a-294-mips-wrs-linux-gnu/host-i686-pc-linux-gnu/mabi_64/prelink.d/ld-2.8.so
    mips-wrs-linux-gnu-prelink: /scratch/thomas/issue8927/obj/test-4.3a-294-mips-wrs-linux-gnu/host-i686-pc-linux-gnu/mabi_64/prelink.d/ld-2.8.so: 64-bit DWARF not supported
    mips-wrs-linux-gnu-prelink: Could not prelink ./libc.so.6 because its dependency ./ld.so.1 could not be prelinked
    mips-wrs-linux-gnu-prelink: Could not prelink ./reloc1lib1.so because its dependency ./libc.so.6 could not be prelinked
    mips-wrs-linux-gnu-prelink: Could not prelink ./reloc1lib2.so because its dependency ./reloc1lib1.so could not be prelinked
    mips-wrs-linux-gnu-prelink: Could not prelink ./reloc1 because its dependency ./reloc1lib2.so could not be prelinked

I'll try to hunt down where this ``64-bit DWARF not supported'' is coming
from, and why handling SHT_MIPS_DWARF in prelink can be responsible for
it, but if anyone has any ideas already, please tell me.


Regards,
 Thomas

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