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Hello! On 2010-07-01 15:43, I wrote: > 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 This happens when processing .debug_lines, which is generated by GAS. prelink does not support the 64-bit DWARF format. From a quick glance, GDB does, see dwarf2read.c:read_initial_length. MIPS is, per gas/config/tc-mips, the only architecture to override DWARF2_FORMAT (which defaults to 32-bit), and thus possibly can emit 64-bit DWARF code, which it actually does for -mabi=64, see tc-mips.c:mips_dwarf2_format. In <http://sourceware.org/ml/binutils/2002-11/msg00429.html> this 64-bit DWARF format support has originally been added. What's our way forward? Can we switch MIPS back to only using the 32-bit DWARF format (save the IRIX case)? Do we need to extend prelink? As I understand the GCC code, it always uses the 32-bit DWARF format, even for MIPS 64-bit ABIs. Regards, Thomas
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