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Almost identical to GNU .debug_macro extension. Just accept and use
DW_AT_macros where we accept or use DW_AT_GNU_macros. And be a little
stricter in which FORMs we accept (this could have caused problems
with the GNU variant too). Deals with DW_FORM_strx[1234], but not yet
with imported macros through DW_MACRO_import_sup.
Signed-off-by: Mark Wielaard <[email protected]>
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The DIE (attribute) data might come from either the main .debug_info
section or for DWARFv4 from a separate .debug_types section. Or in
case of the fake_loc_cu from the .debug_loc section and in the case
of macros from the .debug_macinfo or .debug_macro section.
We didn't handle the last two "fake" CU cases correctly when sanity
checking offsets in __libdw_read_address and __libdw_read_offset.
Add an explicit sec_idx field to struct Dwarf_CU that is always set
to the actual section that the data came from.
Signed-off-by: Mark Wielaard <[email protected]>
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Accept version 5 .debug_macro format, which is identical to the GNU
version 4 format. No real support yet for the new supplementary object
file (sup) and indirect string references (strx). GCC doesn't generate
them yet. readelf does recognize them, but doesn't try to decode them.
dwarf_getmacros currently rejects the new formats.
Signed-off-by: Mark Wielaard <[email protected]>
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We already require -std=gnu99 and old-style function definitions might
hide some compiler warnings.
Signed-off-by: Mark Wielaard <[email protected]>
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dwarf_formudata can return an error for bad DWARF. Don't ignore it.
Signed-off-by: Mark Wielaard <[email protected]>
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In theory user defined debug macros can have an arbitrary number of
arguments. Don't allocate them all on stack. If there are more than
8 (arbitrary number, but no sane macro should have more arguments),
then dynamically allocate and free the attributes.
Found by gcc -fsanitize=undefined. Which pointed out the nforms could
be zero, creating an empty vla (which could cause undefined behavior).
Signed-off-by: Mark Wielaard <[email protected]>
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Both get_uleb128 and get_sleb128 now take an end pointer to prevent
reading too much data. Adjust all callers to provide the end pointer.
There are still two exceptions. "Raw" dwarf_getabbrevattr and
read_encoded_valued don't have a end pointer associated yet.
They will have to be provided in the future.
Signed-off-by: Mark Wielaard <[email protected]>
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All attributes now have a reference to a (fake) CU that has startp and
endp set to the data section where the form data comes from. Use that
for bounds checking in __libdw_form_val_len and dwarf_formblock to make
sure data read doesn't overflow any data section. Remove libdwP.h cu_data
and use cu startp and endp directly where appropriate.
Signed-off-by: Mark Wielaard <[email protected]>
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Pass endp as argument to __libdw_form_val_len and check we don't read
beyond the end of expected data and don't return lengths that would
overflow.
Signed-off-by: Mark Wielaard <[email protected]>
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We now require callers to pass DWARF_GETMACROS_START to start the
iteration. 0 is still accepted, but signals to libdw that the
iteration request comes from an old-style caller, and that opcode 0xff
should be rejected when iterating .debug_macro, to avoid confusion.
Signed-off-by: Petr Machata <[email protected]>
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- This code is based on the following proposal:
http://www.dwarfstd.org/ShowIssue.php?issue=110722.1
- dwarf_getmacros serves either of .debug_macinfo or .debug_macro
transparently, but if the latter uses opcode 0xff, it bails out with
an error. The reason is that in .debug_macro, 0xff is a custom code
that can mean anything, while in .debug_macinfo there's fixed
semantics associated with 0xff.
- dwarf_getmacros_off is a new interface used for requesting iteration
through transparently included units.
- dwarf_macro_getparamcnt and dwarf_macro_param are new interfaces
used for requesting number of parameters of an opcode and individual
parameters. dwarf_macro_getsrcfiles is a new interface used for
requesting a file part of .debug_line unit associated with macro
unit that the opcode comes from.
- The existing interfaces dwarf_macro_opcode, dwarf_macro_param1 and
dwarf_macro_param2 remain operational for old- as well as new-style
Dwarf macro sections, if applicable.
- dwarf_getsrclines was made into a light wrapper around a worker
function that loads line unit given its offset. The worker also
caches loaded units in an offset-keyed search tree, so that we don't
end up re-reading units even though they were read in a different
domain (e.g. a macro unit request can prime cache for later CU
lookup). dwarf_macro_getsrcfiles calls the worker function under
covers.
Signed-off-by: Petr Machata <[email protected]>
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* Change name from "Red Hat elfutils" to "elfutils".
* Update license of standalone tools and test from GPLv2 to GPLv3+.
* Change license of libraries from GPLv2+exception to GPLv2/LGPLv3+.
* Add Developer Certificate of Origin based contributor policy.
top-level:
- COPYING: Upgraded from GPLv2 to GPLv3.
- CONTRIBUTING, COPYING-GPLv2, COPYING-LGPLv3: New files.
- NEWS: Added note about new contribution and license policy.
- Makefile.am: Updated to GPLv3, added new files to EXTRA_DIST.
- configure.ac: Update to GPLv3, changed AC_INIT name to 'elfutils'.
backends, lib, libasm, libcpu, libdw, libdwfl, libebl, libelf:
- All files updated to GPLv2/LGPLv3+. Except some very small files
(<5 lines) which didn't have any headers at all before, the linker
.maps files and the libcpu/defs files which only contain data and
libelf/elf.h which comes from glibc and is under LGPLv2+.
config:
- elfutils.spec.in: Add new License: headers and new %doc files.
- Update all license headers to GPLv2/LGPLv3+ for files used by libs.
src, tests:
- All files updated to GPLv3+. Except for the test bz2 data files, the
linker maps and script files and some very small files (<5 lines)
that don't have any headers.
Signed-off-by: Richard Fontana <[email protected]>
Signed-off-by: Mark Wielaard <[email protected]>
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4f8fc821345feef58624f0aa5b470d4827577d8c)
to branch 'com.redhat.elfutils' (head 76e26cb54695fd3b21ee8fb5be3036bd68200633)
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