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Some arches like ppc64 use function descriptor values instead of function
addresses causing matching of names and addresses to fail when using
dwfl_module_getsym or dwfl_module_addrsym.
Add ebl hook to resolve any function descriptor values found in non-ET_REL
modules.
The new function dwfl_module_getsym_info doesn't adjust the symbol value
in any way, but returns the adjusted and/or resolved address associated
with the symbol separately. The new function dwfl_module_addrinfo resolves
against both the address associated with the symbol (which could be the
function entry address) value and the adjusted st_value. So that it is
easy to resolve and match either function descriptors and/or function
entry addresses.
Since these new functions also return more information they replace the
dwfl_module_getsym_elf and dwfl_module_addrsym_elf functions that never
made it into a released elfutils version.
addr2line and readelf now use the new functions when looking up functions
names. addr2line will now also display the section the address was found
in when given -x.
Extra testcases were added for both addr2line and the dwflsyms testscase.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Introduce two new functions that also return the elf associated with a
symbol to make symbol section indexing work for non-special sections.
Simplify code by removing dwfl_file where appropriate and just track Elf
directly. Document limitations of shndx with existing dwfl_module_addrsym
and dwfl_module_getsym. Extend dwflsyms testcase to check some more symbol
and section (index) properties.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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The two test files that contains minisymtab tables and the expected test
output were wrongly generated. Also prelink tests were missing to check
that a prelinked main ELF file with separate debug or minisyms generated
correctly adjusted symbol values. The dwflsyms test was also extended to
check print and check the result of dwfl_module_relocate_address.
Reported-by: Josh Stone <jistone@redhat.com>
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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Various tests for the new minisymtab support.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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