In both systemtap and libabigail there is a need to get the actual Dwarf
underlying an Dwarf_Die or Dwarf_Attribute. Following a DIE reference
might end up in an alternate Dwarf since the addition of DWZ multifile
forms. Both Dwarf_Die and Dwarf_Attribute already contain a Dwarf_CU
handle. Add a function dwarf_cu_getdwarf to retrieve the underlying
Dwarf using the Dwarf_CU.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
Move internal function __libdwfl_find_build_id to libdwelf and use it to
add a public dwelf_elf_gnu_build_id function to extract the NT_GNU_BUILD_ID
from an ELF file using either the shdrs or phdrs. Adjust internal callers
and add a testcase.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
New public header elfutils/libdwelf.h for low-level DWARF/ELF helper
functions. The new function dwelf_elf_gnu_debuglink returns the name and
crc as found in the .gnu_debuglink section of an ELF file.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
Rewrite __libdwfl_attach_state_for_pid and __libdwfl_attach_state_for_core
as public functions and don't call them from dwfl_linux_proc_report and
dwfl_core_file_report anymore. This lets the user attach state explicitly
independ from how the dwfl modules have been reported. Since attaching
state is an explicit action now the error can be returned directly and we
don't need to keep track of process_attach_error. dwfl_linux_proc_attach
lets the user can tell libdwfl whether caller takes care of ptrace
attaching and stopping the threads under inspection, or whether the
callback needs to take care of that and detaching again.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
dwfl_getthread_frames is a convenience function for when the user is only
interested in one specific thread id of a process. It can be implemented by
a simple wrapper function that removes an extra callback layer just to
filter on thread id. But it also provides an optimized path to getting
access to just one particular Dwfl_Thread of the Dwfl process by providing
and (optional) new callback for the state provider. The pid_thread_callbacks
now provide an (optional) pid_getthread that doesn't need to travers all
threads anymore. Which is implemented for the linux-pid-attach provider.
stack now uses this to implement a new '-1' option that shows just one
specific thread of a process.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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>
New function that provides the index after the last non-local symbol as
returned by dwfl_module_getsym and dwfl_module_getsym_info. Allows users to
first search through all global symbols before searching the local symbols
in the table like dwfl_module_addrsym and dwfl_module_addrsym_info do as
optimization.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
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>
It took two versions to get the new thread state and unwind dwfl functions
in. Make sure they carry the latest elfutils symbol version in which they
were actually added.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
./
2013-10-30 Jan Kratochvil <jan.kratochvil@redhat.com>
* NEWS (Version 0.158): New.
libdw/
2013-10-30 Jan Kratochvil <jan.kratochvil@redhat.com>
* libdw.map (ELFUTILS_0.158): New.
libdwfl/
2013-10-30 Jan Kratochvil <jan.kratochvil@redhat.com>
* argp-std.c (parse_opt): Use executable parameter of
dwfl_core_file_report.
* core-file.c (dwfl_core_file_report): Add parameter executable. Set
it to DWFL. Add NEW_VERSION for it.
(_compat_without_executable_dwfl_core_file_report): New. Twice.
* libdwfl.h (dwfl_core_file_report): Add parameter executable, update
the function comment.
Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
Some location expression operations have a DIE associated with them.
Examples are some of the new GNU typed DWARF extensions, DW_OP_GNU_convert,
DW_OP_GNU_reinterpret, DW_OP_GNU_const_type, DW_OP_GNU_regval_type and
DW_OP_GNU_deref_type. Others have (block) values associated with them,
like DW_OP_GNU_entry_value and DW_OP_GNU_const_type.
It is not always easy to access these values. The DIE offset is given in
various formats either as global offset or CU relative offset. The (block)
value might be constant or a location description. And the block might be
encoded with a uleb128 or ubyte length. The new functions help to easily
get at the DIE or attribute value.
In theory dwarf_getlocation_attr could be used for all cases, since
besides returning DW_AT_const_value or DW_AT_location, it could also
return an attribute referencing a DIE. But at least one operation,
DW_OP_GNU_const_type, has both a (type) DIE and a constant (block)
value associated with it. And directly getting the DIE when needed
is easier than first having to retrieve a (synthesized) attribute
and then getting the actual (type) DIE.
Expression operations that reference an actual DIE for the
DW_AT_location or DW_AT_const_value, like DW_OP_call2, DW_OP_call4,
DW_OP_callref and DW_OP_GNU_implicit_pointer can be used with both
dwarf_getlocation_attr and dwarf_getlocation_die.
DW_OP_implicit_value and DW_OP_GNU_implicit_pointer already had
their own special accessors (dwarf_getlocation_implicit_value
and dwarf_getlocation_implicit_pointer), but it seemed consistent
to include them in the new more generic accessors too.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
Using dwarf_getlocation it is possible to get single location
descriptions and with dwarf_getlocation_addr it is possible to
get a location list covering a specific address. But sometimes
it is more convenient to get all ranges covered by a location
list. For example when a specific address isn't covered and
you want to find alternative addresses where a location
description is defined.
dwarf_getlocations is modelled after dwarf_ranges. It enumerates
the location ranges and descriptions covered by the given
attribute. In the first call OFFSET should be zero and *BASEP
need not be initialized. Returns -1 for errors, zero when
there are no more locations to report, or a nonzero OFFSET
value to pass to the next call. Each subsequent call must
preserve *BASEP from the prior call. Successful calls fill in
*STARTP and *ENDP with a contiguous address range and *EXPR with
a pointer to an array of operations with length *EXPRLEN. If
the attribute describes a single location description and not a
location list the first call (with OFFSET zero) will return the
location description in *EXPR with *STARTP set to zero and *ENDP
set to minus one.
ptrdiff_t dwarf_getlocations (Dwarf_Attribute *attr, ptrdiff_t offset,
Dwarf_Addr *basep, Dwarf_Addr *startp,
Dwarf_Addr *endp, Dwarf_Op **expr,
size_t *exprlen);
Signed-off-by: Mark Wielaard <mjw@redhat.com>
libdwfl/
* dwfl_report_elf.c (__libdwfl_report_elf): Add parameter add_p_vaddr.
Set it to true for ET_EXEC and ET_CORE. Provide alternative
setup of START and BIAS if !ADD_P_VADDR. Set END from BIAS, not BASE.
(dwfl_report_elf): Add parameter add_p_vaddr. Pass it down. Add
NEW_VERSION.
(_compat_without_add_p_vaddr_dwfl_report_elf) <SHARED>: New, with
COMPAT_VERSION.
* libdwfl.h (dwfl_report_elf): Add parameter add_p_vaddr. Describe it.
* libdwflP.h (__libdwfl_report_elf): Add parameter add_p_vaddr.
* link_map.c (report_r_debug): Use true add_p_vaddr for dwfl_report_elf.
* linux-kernel-modules.c (report_kernel): Use false add_p_vaddr for
dwfl_report_elf.
* offline.c (process_elf): Use true add_p_vaddr for dwfl_report_elf.
tests/
* dwfl-report-elf-align.c: Use false add_p_vaddr for dwfl_report_elf.
Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
2007-10-04 Roland McGrath <roland@redhat.com>
* readelf.c (print_archive_index): New variable.
(options, parse_opt): Accept -c/--archive-index to set it.
(dump_archive_index): New function.
(process_file): Take new arg WILL_PRINT_ARCHIVE_INDEX.
Call dump_archive_index on archives if set.
(main): Update caller.
(any_control_option): Give it file scope, moved out of ...
(parse_opt): ... here.
tests/
2007-10-04 Roland McGrath <roland@redhat.com>
* run-readelf-test4.sh: New file.
* Makefile.am (TESTS, EXTRA_DIST): Add it.
2007-04-16 Roland McGrath <roland@redhat.com>
* libdw.map (ELFUTILS_0.127): Add dwfl_module_address_section.
libdwfl/
2007-04-16 Roland McGrath <roland@redhat.com>
* derelocate.c (cache_sections): Apply bias to sh_addr.
(compare_secrefs): Fix address comparison to avoid signed overflow.
(find_section): New function, broken out of ...
(dwfl_module_relocate_address): ... here, call it.
(check_module): New function, broken out of ...
(dwfl_module_relocate_address): ... here, call it.
(dwfl_module_address_section): New function.
* libdwfl.h: Declare it.
tests/
2007-04-16 Roland McGrath <roland@redhat.com>
* dwfl-addr-sect.c: New file.
* Makefile.am (noinst_PROGRAMS): Add it.
(dwfl_addr_sect_LDADD): New variable.
Fixes to last changes.
tests/
2005-10-27 Roland McGrath <roland@redhat.com>
* run-find-prologues.sh: New file.
* Makefile.am (TESTS, EXTRA_DIST): Add it.
2005-08-27 Roland McGrath <roland@redhat.com>
* dwarf_getscopes.c (dwarf_getscopes): Rewritten using
__libdw_visit_scopes.
* dwarf_getscopes_die.c: New file.
* Makefile.am (libdw_a_SOURCES): Add it.
* libdw.h: Declare dwarf_getscopes_die.
* libdw.map: Bump to 0.115 and add it.
* libdw_visit_scopes.c (__libdw_visit_scopes): Pass a struct
containing a DIE and its parent pointer, instead of just Dwarf_Die.
Take two functions for both preorder and postorder visitors.
* libdwP.h: Update decl.
(struct Dwarf_Die_Chain): New type.
* dwarf_func_inline.c: Update uses.
* dwarf_diename.c (dwarf_diename): Use dwarf_attr_integrate.
Add INTDEF.
* libdwP.h: Add INTDECL.
* dwarf_func_name.c (dwarf_func_name): Use dwarf_diename.
src/
2005-08-27 Roland McGrath <roland@redhat.com>
* addr2line.c (dwarf_diename_integrate): Function removed.
(print_dwarf_function): Use plain dwarf_diename.
tests/
2005-08-27 Roland McGrath <roland@redhat.com>
* run-funcscopes.sh: New file.
* testfile25.bz2: New data file.
* Makefile.am (TESTS, EXTRA_DIST): Add them.
2005-08-26 Roland McGrath <roland@redhat.com>
* addrscopes.c (dwarf_diename_integrate): Removed.
(print_vars, handle_address): Use plain dwarf_diename.
2005-08-25 Roland McGrath <roland@redhat.com>
* funcscopes.c: New file.
* Makefile.am (noinst_PROGRAMS): Add it.
(funcscopes_LDADD): New variable.
* run-addrscopes.sh: Add another case.
* testfile24.bz2: New data file.
* Makefile.am (EXTRA_DIST): Add it.
* addrscopes.c (handle_address): Take new argument IGNORE_INLINES,
pass it to dwarf_getscopes.
(main): Pass it, true when '=' follows an address.
Mark Wielaard