This is not exhaustive - DWARF 5 has some new enumeration types not
implemented here - but I think I caught all the ones that are extended
in DWARF 5, plus the new compilation unit type (DW_UT_*), needed when
parsing .debug_info headers.
These were useful when extending libdwarf/ctfconvert/readelf to handle
DWARF generated by gcc 12, which is version 5 by default.
Reviewed by: emaste
MFC after: 3 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D38273
A few have been added, a couple removed.
Reviewed by: jrtc27, imp, emaste
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D38175
GNU readelf emits a blank line before, and uses single quotes around the
symbol table name, in each "Symbol table 'name' contains ## entries"
header.
Reviewed by: markj
MFC after: 3 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D37746
This register set contains the values of the fsbase and gsbase
registers. Note that these registers can already be controlled
individually via ptrace(2) via MD operations, so the main reason for
adding this is to include these register values in core dumps. In
particular, this will enable looking up the value of TLS variables
from core dumps in gdb.
The value of NT_X86_SEGBASES was chosen to match the value of
NT_386_TLS on Linux. The notes serve similar purposes, but FreeBSD
will never dump a note equivalent to NT_386_TLS (which dumps a single
segment descriptor rather than a pair of addresses) and picking a
currently-unused value in the NT_X86_* range could result in a future
conflict.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D34650
This register set exposes the per-thread TLS register. It matches the
layout used by Linux on arm64. Linux does not implement this note for
32-bit arm.
Reviewed by: andrew, markj
Sponsored by: University of Cambridge, Google, Inc.
Differential Revision: https://reviews.freebsd.org/D34595
ASLR stack randomization will reappear in a forthcoming commit. Rather
than inserting a random gap into the stack mapping, the entire stack
mapping itself will be randomized in the same way that other mappings
are when ASLR is enabled.
No functional change intended, as the stack gap implementation is
currently disabled by default.
Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33704
This works around brokenness in buildworld's bootstrapping logic: it
uses the source tree's metadata to collect dependency info (such as,
"libdwarf depends on libz") but links against static host libraries.
If these two are out of sync, as is the case if one builds a commit
prior to the introduction of the libz dependency, then the build fails
when trying to statically link nm(1).
Mitigate the problem by defining a weak uncompress() symbol which simply
returns an error. This ensures that the build won't fail when
statically linking libdwarf without zlib. The downside is that any
tools using libdwarf without zlib will now hit a runtime error if they
attempt to decode compressed sections, but at least they'll fail
deterministically, and compressed debug info is only enabled by default
in main.
In particular, this fixes building of branches lacking commit
dbf05458e3, such as releng branches, stable/12 and 13 and old
revisions of main. Previously the nm(1) build would fail with:
ld: error: undefined symbol: uncompress
>>> referenced by libdwarf_elf_init.c:233
>>> (/usr/src/contrib/elftoolchain/libdwarf/libdwarf_elf_init.c:233)
>>> libdwarf_elf_init.o:(_dwarf_elf_init) in archive
>>> /usr/lib/libdwarf.a
Reported by: dim, ler, krion
Reviewed by: imp, emaste
Fixes: dbf05458e3 ("libdwarf: Support consumption of compressed ELF sections")
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33419
We were not setting "ret" before jumping to the error path, so the
function returned success even when it had failed.
Reviewed by: emaste
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33420
Previously strip reported a somewhat cryptic error for empty files:
strip: elf_begin() failed: Invalid argument
Add a special case to treat empty files as with an unknown file format.
This is consistent with llvm-strip. GNU strip produces no output which
does not seem like useful behaviour (but it does exit with status 1).
Reported by: andrew
Reviewed by: markj
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32648
Add necessary bits to detect ELF format on Linux/aarch64; note that
Linux calls it aarch64 where we would typically call it arm64 (uname -m)
Reviewed by: arichardson, emaste, imp
Sponsored by: Ampere Computing LLC
Sponsored by: Klara Inc.
Differential Revision: https://reviews.freebsd.org/D32542
On arm64 binaries can be tagged as using BTI or PAC. Add support to
decode these to the elftoolchain readelf.
To simplify the code use a table based method to find the flag
description table.
Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32315
ELF tool chain readelf accepts -u / --unwind but just ignores the
option. This was previously undocumented, which could be confusing for
someone encountering `readelf -u` (in a script or GNU readelf example).
Reported by: markj (in D32003)
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
This matches the GNU and LLVM versions of readelf.
As markj noted in the review -u is not actually implemented yet and has
no effect. The option is accepted and just ignored.
Reported by: andrew
Reviewed by: andrew, markj
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32003
GNU readelf exits with an error for a number of invalid file cases.
Previously ELF Tool Chain readelf always exited with 0. Now we exit 1
upon detecting an error with one or more input files, but in any case
all of them are processed.
This should catch common failure cases. We still do not report an error
for some types of malformed ELF files, but this is consistent with GNU
readelf.
PR: 252727
Reviewed by: jkoshy, markj
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29377
Currently macOS and DragonFlyBSD get their own special case and only
handle x86. Since all the FreeBSD cases should be general enough for
macOS and DragonFlyBSD (and the x86 ones are identical to the existing
ones) we can just delete the special cases and reuse the FreeBSD ones.
Note that upstream has since removed all the architecture-specific
checks in this file, with the only code relevant to us being an
endianness check that uses the generic compiler-provided macros. Thus
this patch will not be upstreamed, and will be dropped in a future
vendor import.
Reviewed by: dim
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D29352
Temporary files were not cleaned up, resulting in $TMPDIR or even
the current directory becoming littered with ecp.* files.
This happened with error and even sometimes on success!
Approved by: dim
MFC after: 4 weeks
Accepted upstream: https://sourceforge.net/p/elftoolchain/code/3918/
Differential Revision: https://reviews.freebsd.org/D28651
Check label's ranges for address we want to translate if a CU doesn't
have usable DW_AT_range or DW_AT_low_pc.
Use more appropriate names: "struct CU" -> "struct range"
Developed as part of upstream ELF Tool Chain bug report
https://sourceforge.net/p/elftoolchain/tickets/552/ although this does
not address the specific case reported there.
Submitted by: Tiger Gao <tig@freebsdfoundation.org>
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23782
make it create the temporary file in the same directory as the source
file by default, instead of always using $TMPDIR or /tmp. If creating
that file fails because the directory is not writable, also fallback to
$TMPDIR or /tmp.
This has also been submitted upstream as:
https://sourceforge.net/p/elftoolchain/tickets/597/
Reported by: cem
PR: 250872
MFC after: 2 weeks
Incorporate fixes from Dimitry Andric:
- Use a BUFFER_GROW() macro to avoid rounding errors in capacity
calculations.
- Fix a bug introduced in [r3531].
- Fix handling of nested template parameters.
Ticket: #581
This should fix a number of assertions on elftoolchain's cxxfilt, and
allow it to correctly demangle several names that it could not handle
before.
Obtained from: https://sourceforge.net/p/elftoolchain/code/3877/
PR: 250702
MFC after: 3 days
GNU and Oracle libelf implementations added support for section
compression, intended to reduce the size of DWARF debug info (which
might be an order of magnitude larger than the code).
There are two compressed ELF section formats:
1. Old GNU - sections are renmaed to start with 'z'. Section contains
a magic number, uncompressed size, and compressed data.
2. Oracle and New GNU - compressed sections use the SHF_COMPRESSED flag.
The compression header contains the compression type, uncompressed
size, and uncompressed alignment.
The second style is preferred and this change implements only that one.
Submitted by: Tiger Gao <tig@FreeBSDFoundation.org>
Reviewed by: markj
MFC after: 2 weeks
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D24566
gnu_debuglink external debug files will contain an .eh_frame section of
type SHT_NOBITS. libdwarf does not handle such sections (or rather, it
expects all debug sections to not have type SHT_NOBITS). Avoid loading
SHT_NOBITS sections, to be consistent with SGI libdwarf's handling of
this case.
PR: 239516
Diagnosed by: Paco Pascal <me@pacopascal.com>
Reviewed by: emaste (previous version)
Event: July 2020 Bugathon
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D25626
There is no reason for diep to ever be NULL, since in that case we would
simply be leaking memory.
CID: 1418801
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Previously objcopy (elfcopy) --add-sections inserted new sections before
.shstrtab, but omitted them if there was no .shstrtab.
Now, after processing existing sections add new sections if they were
not yet added.
PR: 241437
Reported by: arrowd
Submitted by: Tiger Gao <tig@FreeBSDFoundation.org>
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23571
Previously _libelf_cvt_NOTE_tom (to host) returned false if a note's
namesz + descsz exceeded the buffer size, while _libelf_cvt_NOTE_tof
(to file) silently truncated. Return false in the latter case too.
Sponsored by: The FreeBSD Foundation
Previously corrupt note namesz or descsz (perhaps caused by readelf's
current lack of endian support for notes) resulted in a crash. Check
that namesz and descsz do not extend beyond the end of the buffer before
trying to access name and desc data.
Reported by: jhb
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
This will be used to tag binaries that require W+X mappings, in advance
of the ability to prevent W^X in mmap/mprotect.
There is still some discussion about the flag's name, but the ABI won't
change even if the name does (as kib pointed out in the review).
Reviewed by: csjp, kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23909
