elfutils-devel May 2012

elfutils-devel@lists.fedorahosted.org

5 participants
6 discussions

Strip on mips
by Kurt Roeckx 18 Oct '12

18 Oct '12

Hi, I'm trying to debug why strip on mips isn't working properly. What I see is that for the debug sections, sh_type is not set to SHT_PROGBITS but to SHT_MIPS_DWARF. The stripped file still ends up with the debug information it it, and the file that is supposed to have the debug symbols in it has it set to SHT_NOBITS, and is rather small. I'm assuming this is because of the SHT_MIPS_DWARF. I'm not sure how to find where it's going wrong. Kurt

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FYI: readelf.c (print_ops): Add missing DW_OP_GNU operands.
by Mark Wielaard 01 Aug '12

01 Aug '12

Pushed the following commit as obvious. commit 716486d5a15bdfb528c5d011dc623fa0f6fdc2af Author: Mark Wielaard <mjw(a)redhat.com> Date: Tue Apr 24 11:56:42 2012 +0200 readelf.c (print_ops): Add missing DW_OP_GNU operands. DW_OP_GNU_push_tls_address, DW_OP_GNU_uinit and DW_OP_GNU_encoded_addr. diff --git a/src/ChangeLog b/src/ChangeLog index 642df1b..cae5e6b 100644 --- a/src/ChangeLog +++ b/src/ChangeLog @@ -1,3 +1,8 @@ +2012-04-24 Mark Wielaard <mjw(a)redhat.com> + + * readelf.c (print_ops): Add DW_OP_GNU_push_tls_address, + DW_OP_GNU_uinit and DW_OP_GNU_encoded_addr. + 2012-03-28 Roland McGrath <roland(a)hack.frob.com> * elflint.c (special_sections): Accept SHF_INFO_LINK for reloc sections. diff --git a/src/readelf.c b/src/readelf.c index b70779d..b4e9fc8 100644 --- a/src/readelf.c +++ b/src/readelf.c @@ -4065,6 +4065,9 @@ print_ops (Dwfl_Module *dwflmod, Dwarf *dbg, int indent, int indentrest, [DW_OP_bit_piece] = "bit_piece", [DW_OP_implicit_value] = "implicit_value", [DW_OP_stack_value] = "stack_value", + [DW_OP_GNU_push_tls_address] = "GNU_push_tls_address", + [DW_OP_GNU_uninit] = "GNU_uninit", + [DW_OP_GNU_encoded_addr] = "GNU_encoded_addr", [DW_OP_GNU_implicit_pointer] = "GNU_implicit_pointer", [DW_OP_GNU_entry_value] = "GNU_entry_value", [DW_OP_GNU_const_type] = "GNU_const_type",

6 48

Function symbol retention after stripping
by Douglas, William 26 Jun '12

26 Jun '12

Hi all, I'm trying to get gbd backtraces to give function names without having a package's debuginfo installed. Would elfutils take a patch allowing strip to take an option for keeping the minimal amount of information needed to do this? I'm still trying to figure out how to do this exactly but right now I think I would be keeping SHT_SYMTAB and SHT_DYNSYM function symbols but I haven't looked at this code before and I'm still trying to figure out how it all comes together. Any advice would be appreciated if you'd be okay with this functionality in elfutils. Thanks, William

3 6

FYI small test environment tweak
by Mark Wielaard 11 May '12

11 May '12

I pushed the following: commit dbbc67a97ace66c3adc299f26261fdec99d0c0d6 Author: Mark Wielaard <mjw(a)redhat.com> Date: Fri May 11 12:57:57 2012 +0200 TESTS_ENVIRONMENT set LC_ALL and LANG to C. Some tests rely on sort order and output of tools that might be localized. Reported-by: Paweł Sikora <pluto(a)pld-linux.org> diff --git a/tests/ChangeLog b/tests/ChangeLog index 4c6e9f7..841742d 100644 --- a/tests/ChangeLog +++ b/tests/ChangeLog @@ -1,3 +1,7 @@ +2012-05-11 Mark Wielaard <mjw(a)redhat.com> + + * Makefile.am (TESTS_ENVIRONMENT): Set LC_ALL and LANG to C. + 2012-05-07 Mark Wielaard <mjw(a)redhat.com> * low_high_pc.c: Allow highpc == lowpc for CU DIEs for buggy GCC. diff --git a/tests/Makefile.am b/tests/Makefile.am index 61247e4..660791c 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -169,13 +169,14 @@ EXTRA_DIST = run-arextract.sh run-arsymtest.sh \ installed_TESTS_ENVIRONMENT = libdir=$(DESTDIR)$(libdir) \ bindir=$(DESTDIR)$(bindir) \ + LC_ALL=C LANG=C \ $(srcdir)/test-wrapper.sh \ installed $(tests_rpath) \ $(program_transform_name) if STANDALONE TESTS_ENVIRONMENT = $(installed_TESTS_ENVIRONMENT) else !STANDALONE -TESTS_ENVIRONMENT = $(srcdir)/test-wrapper.sh \ +TESTS_ENVIRONMENT = LC_ALL=C LANG=C $(srcdir)/test-wrapper.sh \ ../libdw:../backends:../libelf:../libasm installcheck-local:

1 0

elflint: (zero sized section) alloc flag set but section not in any loaded segment
by Mark Wielaard 09 May '12

09 May '12

Hi, Against development versions of gcc/binutils elflint gives some complaints like: section [24] '.tm_clone_table': alloc flag set but section not in any loaded segment This is because that section's size is zero. So it is somewhat reasonable IMHO that the linker doesn't put it in any segment. Is the following patch to elflint OK? Thanks, Mark

2 4

FYI: tests/low_high_pc.c: Allow highpc == lowpc for CU DIEs for buggy GCC.
by Mark Wielaard 07 May '12

07 May '12

I pushed the following. Although the bug is fixed in GCC 4.7 that has only been released last month. Most distros are still based on 4.6 or lower. commit d9bc75fc20f0ce5064cac192a518af3c7192e96d Author: Mark Wielaard <mjw(a)redhat.com> Date: Mon May 7 13:29:52 2012 +0200 tests/low_high_pc.c: Allow highpc == lowpc for CU DIEs for buggy GCC. GCC < 4.7 had a bug where no code CUs got a highpc == lowpc. Allow that, because it is not the main purpose of this test. diff --git a/tests/ChangeLog b/tests/ChangeLog index abc7340..4c6e9f7 100644 --- a/tests/ChangeLog +++ b/tests/ChangeLog @@ -1,3 +1,7 @@ +2012-05-07 Mark Wielaard <mjw(a)redhat.com> + + * low_high_pc.c: Allow highpc == lowpc for CU DIEs for buggy GCC. + 2012-04-27 Mark Wielaard <mjw(a)redhat.com> * Makefile.am (TESTS): Add run-low_high_pc.sh diff --git a/tests/low_high_pc.c b/tests/low_high_pc.c index 3054046..6fc8b15 100644 --- a/tests/low_high_pc.c +++ b/tests/low_high_pc.c @@ -72,9 +72,12 @@ handle_die (Dwarf_Die *die, void *arg) if (dwarf_highpc (die, &highpc) != 0 && dwarf_hasattr (die, DW_AT_high_pc)) fail (off, name, "has DW_AT_high_pc but dwarf_highpc fails"); + /* GCC < 4.7 had a bug where no code CUs got a highpc == lowpc. + Allow that, because it is not the main purpose of this test. */ if (dwarf_hasattr (die, DW_AT_low_pc) && dwarf_hasattr (die, DW_AT_high_pc) - && highpc <= lowpc) + && highpc <= lowpc + && ! (dwarf_tag (die) == DW_TAG_compile_unit && highpc == lowpc)) { printf("lowpc: %lx, highpc: %lx\n", lowpc, highpc); fail (off, name, "highpc <= lowpc");

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elfutils-devel May 2012