Nick Alcock [Sat, 13 Jul 2019 21:38:00 +0000 (22:38 +0100)]
bfd, ld: add CTF section linking
This is quite complicated because the CTF section's contents depend on
the final contents of the symtab and strtab, because it has two sections
whose contents are shuffled to be in 1:1 correspondence with the symtab,
and an internal strtab that gets deduplicated against the ELF strtab
(with offsets adjusted to point into the ELF strtab instead). It is
also compressed if large enough, so its size depends on its contents!
So we cannot construct it as early as most sections: we cannot even
*begin* construction until after the symtab and strtab are finalized.
Thankfully there is already one section treated similarly: compressed
debugging sections: the only differences are that compressed debugging
sections have extra handling to deal with their changing name if
compressed (CTF sections are always called ".ctf" for now, though we
have reserved ".ctf.*" against future use), and that compressed
debugging sections have previously-uncompressed content which has to be
stashed away for later compression, while CTF sections have no content
at all until we generate it (very late).
BFD also cannot do the link itself: libctf knows how to do it, and BFD
cannot call libctf directly because libctf already depends on bfd for
file I/O. So we have to use a pair of callbacks, one, examine_strtab,
which allows a caller to examine the symtab and strtab after
finalization (called from elf_link_swap_symbols_out(), right before the
symtabs are written, and after the strtab has been finalized), and one
which actually does the emission (called emit_ctf simply because it is
grouped with a bunch of section-specific late-emission function calls at
the bottom of bfd_elf_final_link, and a section-specific name seems best
for that). emit_ctf is actually called *twice*: once from lang_process
if the emulation suggests that this bfd target does not examine the
symtab or strtab, and once via a bfd callback if it does. (This means
that non-ELF targets still get CTF emitted, even though the late CTF
emission stage is never called for them).
v2: merged with non-ELF support patch: slight commit message
adjustments.
v3: do not spend time merging CTF, or crash, if the CTF section is
explicitly discarded. Do not try to merge or compress CTF unless
linking.
v4: add CTF_COMPRESSION_THRESHOLD. Annul the freed input ctf_file_t's
after writeout: set SEC_IN_MEMORY on the output contents so a future
bfd enhancement knows it could free it. Add SEC_LINKER_CREATED |
SEC_KEEP to avoid having to add .ctf to the linker script. Drop
now-unnecessary ldlang.h-level elf-bfd.h include and hackery around
it. Adapt to elf32.em->elf.em and elf-generic.em->ldelf*.c
changes.
v5: fix tabdamage. Drop #inclusions in .h files: include in .c files,
.em files, and use struct forwards instead. Use bfd_section_is_ctf
inline function rather than SECTION_IS_CTF macro. Move a few
comments.
* Makefile.def (dependencies): all-ld depends on all-libctf.
* Makefile.in: Regenerated.
include/
* bfdlink.h (elf_strtab_hash): New forward.
(elf_sym_strtab): Likewise.
(struct bfd_link_callbacks <examine_strtab>): New.
(struct bfd_link_callbacks <emit_ctf>): Likewise.
bfd/
* elf-bfd.h (bfd_section_is_ctf): New inline function.
* elf.c (special_sections_c): Add ".ctf".
(assign_file_positions_for_non_load_sections): Note that
compressed debugging sections etc are not assigned here. Treat
CTF sections like SEC_ELF_COMPRESS sections when is_linker_output:
sh_offset -1.
(assign_file_positions_except_relocs): Likewise.
(find_section_in_list): Note that debugging and CTF sections, as
well as reloc sections, are assigned later.
(_bfd_elf_assign_file_positions_for_non_load): CTF sections get
their size and contents updated.
(_bfd_elf_set_section_contents): Skip CTF sections: unlike
compressed sections, they have no uncompressed content to copy at
this stage.
* elflink.c (elf_link_swap_symbols_out): Call the examine_strtab
callback right before the strtab is written out.
(bfd_elf_final_link): Don't cache the section contents of CTF
sections: they are not populated yet. Call the emit_ctf callback
right at the end, after all the symbols and strings are flushed
out.
ld/
* ldlang.h: (struct lang_input_statement_struct): Add the_ctf.
(struct elf_sym_strtab): Add forward.
(struct elf_strtab_hash): Likewise.
(ldlang_ctf_apply_strsym): Declare.
(ldlang_write_ctf_late): Likewise.
* ldemul.h (ldemul_emit_ctf_early): New.
(ldemul_examine_strtab_for_ctf): Likewise.
(ld_emulation_xfer_type) <emit_ctf_early>: Likewise.
(ld_emulation_xfer_type) <examine_strtab_for_ctf>: Likewise.
* ldemul.c (ldemul_emit_ctf_early): New.
(ldemul_examine_strtab_for_ctf): Likewise.
* ldlang.c: Include ctf-api.h.
(CTF_COMPRESSION_THRESHOLD): New.
(ctf_output): New. Initialized in...
(ldlang_open_ctf): ... this new function. Open all the CTF
sections in the input files: mark them non-loaded and empty
so as not to copy their contents to the output, but linker-created
so the section gets created in the target.
(ldlang_merge_ctf): New, merge types via ctf_link_add_ctf and
ctf_link.
(ldlang_ctf_apply_strsym): New, an examine_strtab callback: wrap
ldemul_examine_strtab_for_ctf.
(lang_write_ctf): New, write out the CTF section.
(ldlang_write_ctf_late): New, late call via bfd's emit_ctf hook.
(lang_process): Call ldlang_open_ctf, ldlang_merge_ctf, and
lang_write_ctf.
* ldmain.c (link_callbacks): Add ldlang_ctf_apply_strsym,
ldlang_write_ctf_late.
* emultempl/aix.em: Add ctf-api.h.
* emultempl/armcoff.em: Likewise.
* emultempl/beos.em: Likewise.
* emultempl/elf.em: Likewise.
* emultempl/generic.em: Likewise.
* emultempl/linux.em: Likewise.
* emultempl/msp430.em: Likewise.
* emultempl/pe.em: Likewise.
* emultempl/pep.em: Likewise.
* emultempl/ticoff.em: Likewise.
* emultempl/vanilla.em: Likewise.
* ldcref.c: Likewise.
* ldctor.c: Likewise.
* ldelf.c: Likewise.
* ldelfgen.c: Likewise.
* ldemul.c: Likewise.
* ldexp.c: Likewise.
* ldfile.c: Likewise.
* ldgram.c: Likewise.
* ldlex.l: Likewise.
* ldmain.c: Likewise.
* ldmisc.c: Likewise.
* ldver.c: Likewise.
* ldwrite.c: Likewise.
* lexsup.c: Likewise.
* mri.c: Likewise.
* pe-dll.c: Likewise.
* plugin.c: Likewise.
* ldelfgen.c (ldelf_emit_ctf_early): New.
(ldelf_examine_strtab_for_ctf): tell libctf about the symtab and
strtab.
(struct ctf_strsym_iter_cb_arg): New, state to do so.
(ldelf_ctf_strtab_iter_cb): New: tell libctf about
each string in the strtab in turn.
(ldelf_ctf_symbols_iter_cb): New, tell libctf
about each symbol in the symtab in turn.
* ldelfgen.h (struct elf_sym_strtab): Add forward.
(struct elf_strtab_hash): Likewise.
(struct ctf_file): Likewise.
(ldelf_emit_ctf_early): Declare.
(ldelf_examine_strtab_for_ctf): Likewise.
* emultempl/elf-generic.em (LDEMUL_EMIT_CTF_EARLY): Set it.
(LDEMUL_EXAMINE_STRTAB_FOR_CTF): Likewise.
* emultempl/aix.em (ld_${EMULATION_NAME}_emulation): Add
emit_ctf_early and examine_strtab_for_ctf, NULL by default.
* emultempl/armcoff.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/beos.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/elf.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/generic.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/linux.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/msp430.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/pe.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/pep.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/ticoff.em (ld_${EMULATION_NAME}_emulation): Likewise.
* emultempl/vanilla.em (ld_vanilla_emulation): Likewise.
* Makefile.am: Pull in libctf (and zlib, a transitive requirement
for compressed CTF section emission). Pass it on to DejaGNU.
* configure.ac: Add AM_ZLIB.
* aclocal.m4: Added zlib.m4.
* Makefile.in: Regenerated.
* testsuite/ld-bootstrap/bootstrap.exp: Use it when relinking ld.
Nick Alcock [Sat, 13 Jul 2019 20:47:30 +0000 (21:47 +0100)]
bfd: new functions for getting strings out of a strtab
The CTF linking process wants to deduplicate the CTF strtab against the
ELF strtab, for which it needs to know the number of strings in the
strtab and it needs to be able to extract them one by one.
The BFD strtab functions only support returning the
size-or-section-length of the strtab (with _bfd_elf_strtab_size)
and returning the offset (but not string!) and decrementing the refcount
at the same time.
So add new functions _bfd_elf_strtab_len (that just returns the length
in strings of the strtab, never the section size) and bfd_elf_strtab_str
(which returns the string at a given strtab index, and its offset,
without touching the refcount).
It is probably a mistake to use _bfd_elf_strtab_str in particular before
_bfd_elf_strtab_finalize is called, and will not produce useful output
if you do so.
v5: fix tabdamage.
bfd/
* elf-strtab.c (_bfd_elf_strtab_len): New.
(_bfd_elf_strtab_str): Likewise.
* bfd-elf.h: Declare them.
Nick Alcock [Mon, 29 Jul 2019 16:02:48 +0000 (17:02 +0100)]
libctf: actually close bfds we have opened
When we do a ctf_fdopen, we open things via bfd_fdopenr and set up a
hook to close the bfd again... but then we never actually call that hook
from anywhere, so we eventually leak every bfd we open.
Fix this by calling the hook (if set) in ctf_arc_close.
New in v3.
libctf/
* ctf-archive.c (ctf_arc_close): Call ctfi_bfd_close if set.
* ctf-open-bfd.c (ctf_bfdclose): Fix comment.
Nick Alcock [Fri, 26 Jul 2019 20:52:11 +0000 (21:52 +0100)]
libctf: bfd-open: mark the bfd as cacheable
Without this, the FD is only closed when the CTF file is, leading to
running out of fds on (e.g.) very large links.
New in v3.
libctf/
* ctf-open-bfd.c (ctf_fdopen): Call bfd_set_cacheable.
Nick Alcock [Sat, 13 Jul 2019 20:45:55 +0000 (21:45 +0100)]
libctf: get rid of a disruptive public include of <sys/param.h>
This hoary old header defines things like MAX that users of libctf might
perfectly reasonably define themselves.
The CTF headers do not need it: move it into libctf/ctf-impl.h instead.
include/
* ctf-api.h (includes): No longer include <sys/param.h>.
libctf/
* ctf-impl.h (includes): Include <sys/param.h> here.
Nick Alcock [Thu, 25 Jul 2019 18:59:32 +0000 (19:59 +0100)]
libctf: eschew C99 for loop initial declarations
We shouldn't use these, since binutils doesn't require a C99-capable
compiler yet.
New in v3.
v5: fix tabdamage.
libctf/
* ctf-open.c (flip_lbls): Eschew for-loop initial declarations.
(flip_objts): Likewise.
(flip_vars): Likewise.
(flip_types): Likewise.
Nick Alcock [Wed, 24 Jul 2019 14:21:56 +0000 (15:21 +0100)]
libctf: don't leak hash keys or values on value replacement
When a ctf_dynhash_insert() finds a slot already existing, it should
call the key and value free functions on the existing key and value and
move the passed-in key into place, so that the lifetime rules for hash
keys are always the same no matter whether the key existed or not but
neither are the keys or values leaked.
New in v3.
v5: fix tabdamage.
libctf/
* ctf-hash.c (ctf_hashtab_insert): Pass in the key and value
freeing functions: if set, free the key and value if the slot
already exists. Always reassign the key.
(ctf_dynhash_insert): Adjust call appropriately.
(ctf_hash_insert_type): Likewise.
Nick Alcock [Fri, 2 Aug 2019 23:46:01 +0000 (00:46 +0100)]
libctf: teach ctf_add_type how forwards work
This machinery has been broken for as long as Solaris has existed.
Forwards are meant to encode "struct foo;", "enum foo;" or "union
foo;". Obviously these all exist in distinct namespaces, so forwards
store the type kind they forward to in their ctt_type member
(which makes conceptual sense if you squint at it). The addition
machinery uses this to promote forwards to the appropriate type as
needed.
Unfortunately ctf_add_type does not: it checks the global namespace
(which is always wrong), and so fails with a spurious conflict if you
have, say, a typedef and then a forward comes along with the same name,
even if it's a forward to something like a struct. (This was observed
with <libio.h>, which has "struct _IO_FILE;" and also
"typedef struct _IO_FILE _IO_FILE"). We should look at the recorded
type kind and look in the appropriate namespace. We should also,
when creating the forward in the new container, use that type kind,
rather than just defaulting to CTF_K_STRUCT and hoping that what
eventually comes along is a struct.
This bug is as old as the first implementation of ctf_add_type in
Solaris. But we also want a new feature for the linker, closely-related
and touching the same code so we add it here: not only do we want a
forward followed by a struct/union/enum to promote the forward, but
we want want a struct/union/enum followed by a forward to act as a NOP
and return the existing type, because when we're adding many files
in succession to a target link, there will often be already-promoted
forwards (in the shape of a struct/union/enum) that want to unify
with duplicate forwards coming from other object files.
v5: fix tabdamage.
libctf/
* ctf-create.c (ctf_add_type): Look up and use the forwarded-to
type kind. Allow forwards to unify with pre-existing structs/
unions/enums.
Nick Alcock [Sat, 20 Jul 2019 13:44:44 +0000 (14:44 +0100)]
libctf: add CU-mapping machinery
Once the deduplicator is capable of actually detecting conflicting types
with the same name (i.e., not yet) we will place such conflicting types,
and types that depend on them, into CTF dictionaries that are the child
of the main dictionary we usually emit: currently, this will lead to the
.ctf section becoming a CTF archive rather than a single dictionary,
with the default-named archive member (_CTF_SECTION, or NULL) being the
main shared dictionary with most of the types in it.
By default, the sections are named after the compilation unit they come
from (complete path and all), with the cuname field in the CTF header
providing further evidence of the name without requiring the caller to
engage in tiresome parsing. But some callers may not wish the mapping
from input CU to output sub-dictionary to be purely CU-based.
The machinery here allows this to be freely changed, in two ways:
- callers can call ctf_link_add_cu_mapping to specify that a single
input compilation unit should have its types placed in some other CU
if they conflict: the CU will always be created, even if empty, so
the consuming program can depend on its existence. You can map
multiple input CUs to one output CU to force all their types to be
merged together: if some of *those* types conflict, the behaviour is
currently unspecified (the new deduplicator will specify it).
- callers can call ctf_link_set_memb_name_changer to provide a function
which is passed every CTF sub-dictionary name in turn (including
_CTF_SECTION) and can return a new name, or NULL if no change is
desired. The mapping from input to output names should not map two
input names to the same output name: if this happens, the two are not
merged but will result in an archive with two members with the same
name (technically valid, but it's hard to access the second
same-named member: you have to do an iteration over archive members).
This is used by the kernel's ctfarchive machinery (not yet upstream) to
encode CTF under member names like {module name}.ctf rather than
.ctf.CU, but it is anticipated that other large projects may wish to
have their own storage for CTF outside of .ctf sections and may wish to
have new naming schemes that suit their special-purpose consumers.
New in v3.
v4: check for strdup failure.
v5: fix tabdamage.
include/
* ctf-api.h (ctf_link_add_cu_mapping): New.
(ctf_link_memb_name_changer_f): New.
(ctf_link_set_memb_name_changer): New.
libctf/
* ctf-impl.h (ctf_file_t) <ctf_link_cu_mappping>: New.
<ctf_link_memb_name_changer>: Likewise.
<ctf_link_memb_name_changer_arg>: Likewise.
* ctf-create.c (ctf_update): Update accordingly.
* ctf-open.c (ctf_file_close): Likewise.
* ctf-link.c (ctf_create_per_cu): Apply the cu mapping.
(ctf_link_add_cu_mapping): New.
(ctf_link_set_memb_name_changer): Likewise.
(ctf_change_parent_name): New.
(ctf_name_list_accum_cb_arg_t) <dynames>: New, storage for names
allocated by the caller's ctf_link_memb_name_changer.
<ndynames>: Likewise.
(ctf_accumulate_archive_names): Call the ctf_link_memb_name_changer.
(ctf_link_write): Likewise (for _CTF_SECTION only): also call
ctf_change_parent_name. Free any resulting names.
Nick Alcock [Sat, 13 Jul 2019 20:41:25 +0000 (21:41 +0100)]
libctf: add linking of the variable section
The compiler describes the name and type of all file-scope variables in
this section. Merging it at link time requires using the type mapping
added in the previous commit to determine the appropriate type for the
variable in the output, given its type in the input: we check the shared
container first, and if the type doesn't exist there, it must be a
conflicted type in the per-CU child, and the variable should go there
too. We also put the variable in the per-CU child if a variable with
the same name but a different type already exists in the parent: we
ignore any such conflict in the child because CTF cannot represent such
things, nor can they happen unless a third-party linking program has
overridden the mapping of CU to CTF archive member name (using machinery
added in a later commit).
v3: rewritten using an algorithm that actually works in the case of
conflicting names. Some code motion from the next commit. Set
the per-CU parent name.
v4: check for strdup failure.
v5: fix tabdamage.
include/
* ctf-api.h (ECTF_INTERNAL): New.
libctf/
* ctf-link.c (ctf_create_per_cu): New, refactored out of...
(ctf_link_one_type): ... here, with parent-name setting added.
(check_variable): New.
(ctf_link_one_variable): Likewise.
(ctf_link_one_input_archive_member): Call it.
* ctf-error.c (_ctf_errlist): Updated with new errors.
Nick Alcock [Sat, 13 Jul 2019 20:31:26 +0000 (21:31 +0100)]
libctf: map from old to corresponding newly-added types in ctf_add_type
This lets you call ctf_type_mapping (dest_fp, src_fp, src_type_id)
and get told what type ID the corresponding type has in the target
ctf_file_t. This works even if it was added by a recursive call, and
because it is stored in the target ctf_file_t it works even if we
had to add one type to multiple ctf_file_t's as part of conflicting
type handling.
We empty out this mapping after every archive is linked: because it maps
input to output fps, and we only visit each input fp once, its contents
are rendered entirely useless every time the source fp changes.
v3: add several missing mapping additions. Add ctf_dynhash_empty, and
empty after every input archive.
v5: fix tabdamage.
libctf/
* ctf-impl.h (ctf_file_t): New field ctf_link_type_mapping.
(struct ctf_link_type_mapping_key): New.
(ctf_hash_type_mapping_key): Likewise.
(ctf_hash_eq_type_mapping_key): Likewise.
(ctf_add_type_mapping): Likewise.
(ctf_type_mapping): Likewise.
(ctf_dynhash_empty): Likewise.
* ctf-open.c (ctf_file_close): Update accordingly.
* ctf-create.c (ctf_update): Likewise.
(ctf_add_type): Populate the mapping.
* ctf-hash.c (ctf_hash_type_mapping_key): Hash a type mapping key.
(ctf_hash_eq_type_mapping_key): Check the key for equality.
(ctf_dynhash_insert): Fix comment typo.
(ctf_dynhash_empty): New.
* ctf-link.c (ctf_add_type_mapping): New.
(ctf_type_mapping): Likewise.
(empty_link_type_mapping): New.
(ctf_link_one_input_archive): Call it.
Nick Alcock [Sat, 13 Jul 2019 20:06:55 +0000 (21:06 +0100)]
libctf: add the ctf_link machinery
This is the start of work on the core of the linking mechanism for CTF
sections. This commit handles the type and string sections.
The linker calls these functions in sequence:
ctf_link_add_ctf: to add each CTF section in the input in turn to a
newly-created ctf_file_t (which will appear in the output, and which
itself will become the shared parent that contains types that all
TUs have in common (in all link modes) and all types that do not
have conflicting definitions between types (by default). Input files
that are themselves products of ld -r are supported, though this is
not heavily tested yet.
ctf_link: called once all input files are added to merge the types in
all the input containers into the output container, eliminating
duplicates.
ctf_link_add_strtab: called once the ELF string table is finalized and
all its offsets are known, this calls a callback provided by the
linker which returns the string content and offset of every string in
the ELF strtab in turn: all these strings which appear in the input
CTF strtab are eliminated from it in favour of the ELF strtab:
equally, any strings that only appear in the input strtab will
reappear in the internal CTF strtab of the output.
ctf_link_shuffle_syms (not yet implemented): called once the ELF symtab
is finalized, this calls a callback provided by the linker which
returns information on every symbol in turn as a ctf_link_sym_t. This
is then used to shuffle the function info and data object sections in
the CTF section into symbol table order, eliminating the index
sections which map those sections to symbol names before that point.
Currently just returns ECTF_NOTYET.
ctf_link_write: Returns a buffer containing either a serialized
ctf_file_t (if there are no types with conflicting definitions in the
object files in the link) or a ctf_archive_t containing a large
ctf_file_t (the common types) and a bunch of small ones named after
individual CUs in which conflicting types are found (containing the
conflicting types, and all types that reference them). A threshold
size above which compression takes place is passed as one parameter.
(Currently, only gzip compression is supported, but I hope to add lzma
as well.)
Lifetime rules for this are simple: don't close the input CTF files
until you've called ctf_link for the last time. We do not assume
that symbols or strings passed in by the callback outlast the
call to ctf_link_add_strtab or ctf_link_shuffle_syms.
Right now, the duplicate elimination mechanism is the one already
present as part of the ctf_add_type function, and is not particularly
good: it misses numerous actual duplicates, and the conflicting-types
detection hardly ever reports that types conflict, even when they do
(one of them just tends to get silently dropped): it is also very slow.
This will all be fixed in the next few weeks, but the fix hardly touches
any of this code, and the linker does work without it, just not as
well as it otherwise might. (And when no CTF section is present,
there is no effect on performance, of course. So only people using
a trunk GCC with not-yet-committed patches will even notice. By the
time it gets upstream, things should be better.)
v3: Fix error handling.
v4: check for strdup failure.
v5: fix tabdamage.
include/
* ctf-api.h (struct ctf_link_sym): New, a symbol in flight to the
libctf linking machinery.
(CTF_LINK_SHARE_UNCONFLICTED): New.
(CTF_LINK_SHARE_DUPLICATED): New.
(ECTF_LINKADDEDLATE): New, replacing ECTF_UNUSED.
(ECTF_NOTYET): New, a 'not yet implemented' message.
(ctf_link_add_ctf): New, add an input file's CTF to the link.
(ctf_link): New, merge the type and string sections.
(ctf_link_strtab_string_f): New, callback for feeding strtab info.
(ctf_link_iter_symbol_f): New, callback for feeding symtab info.
(ctf_link_add_strtab): New, tell the CTF linker about the ELF
strtab's strings.
(ctf_link_shuffle_syms): New, ask the CTF linker to shuffle its
symbols into symtab order.
(ctf_link_write): New, ask the CTF linker to write the CTF out.
libctf/
* ctf-link.c: New file, linking of the string and type sections.
* Makefile.am (libctf_a_SOURCES): Add it.
* Makefile.in: Regenerate.
* ctf-impl.h (ctf_file_t): New fields ctf_link_inputs,
ctf_link_outputs.
* ctf-create.c (ctf_update): Update accordingly.
* ctf-open.c (ctf_file_close): Likewise.
* ctf-error.c (_ctf_errlist): Updated with new errors.
Nick Alcock [Sat, 13 Jul 2019 19:50:49 +0000 (20:50 +0100)]
libctf: dump: check the right error values when dumping functions
We weren't correctly detecting when there were no functions to dump in
the function info table, because we were checking for ECTF_NOTYPEDAT,
which means there are no *data objects* to dump.
Adjust accordingly.
libctf/
* ctf-dump.c (ctf_dump_funcs): Check the right error value.
Nick Alcock [Sat, 13 Jul 2019 19:49:19 +0000 (20:49 +0100)]
libctf: dump: support non-root type dumping
Use the recently-added ctf_type_iter_all function to iterate over
non-root types, too, indicating them via {....} surrounding the type
description in the dump.
libctf/
* ctf-dump.c (ctf_dump): Use ctf_type_iter_all to dump types, not
ctf_type_iter.
(ctf_dump_type): Pass down the flag from ctf_type_iter_all.
(ctf_dump_format_type): Add non-root-type { } notation.
Add root flag to prototype.
(ctf_dump_label): Adjust accordingly.
(ctf_dump_objts): Likewise.
(ctf_dump_var): Likewise.
Nick Alcock [Sat, 13 Jul 2019 19:44:38 +0000 (20:44 +0100)]
libctf: fix double-free on ctf_compress_write error path
We were freeing the compressed data buffer twice if compression failed.
v4: Fix commit message.
v5: fix tabdamage.
libctf/
* ctf-create.c (ctf_compress_write): Fix double-free.
Nick Alcock [Sat, 13 Jul 2019 19:40:52 +0000 (20:40 +0100)]
libctf: write CTF files to memory, and CTF archives to fds
Before now, we've been able to write CTF files to gzFile descriptors or
fds, and CTF archives to named files only.
Make this a bit less irregular by allowing CTF archives to be written
to fds with the new function ctf_arc_write_fd: also allow CTF
files to be written to a new memory buffer via ctf_write_mem.
(It would be nice to complete things by adding a new function to write
CTF archives to memory, but this is too difficult to do given the short
time the linker is expected to be writing them out: we will transition
to a better format in format v4, though we will always support reading
CTF archives that are stored in .ctf sections.)
include/
* ctf-api.h (ctf_arc_write_fd): New.
(ctf_write_mem): Likewise.
(ctf_gzwrite): Spacing fix.
libctf/
* ctf-archive.c (ctf_arc_write): Split off, and reimplement in terms
of...
(ctf_arc_write_fd): ... this new function.
* ctf-create.c (ctf_write_mem): New.
Nick Alcock [Sat, 13 Jul 2019 19:33:01 +0000 (20:33 +0100)]
libctf: support getting strings from the ELF strtab
The CTF file format has always supported "external strtabs", which
internally are strtab offsets with their MSB on: such refs
get their strings from the strtab passed in at CTF file open time:
this is usually intended to be the ELF strtab, and that's what this
implementation is meant to support, though in theory the external
strtab could come from anywhere.
This commit adds support for these external strings in the ctf-string.c
strtab tracking layer. It's quite easy: we just add a field csa_offset
to the atoms table that tracks all strings: this field tracks the offset
of the string in the ELF strtab (with its MSB already on, courtesy of a
new macro CTF_SET_STID), and adds a new function that sets the
csa_offset to the specified offset (plus MSB). Then we just need to
avoid writing out strings to the internal strtab if they have csa_offset
set, and note that the internal strtab is shorter than it might
otherwise be.
(We could in theory save a little more time here by eschewing sorting
such strings, since we never actually write the strings out anywhere,
but that would mean storing them separately and it's just not worth the
complexity cost until profiling shows it's worth doing.)
We also have to go through a bit of extra effort at variable-sorting
time. This was previously using direct references to the internal
strtab: it couldn't use ctf_strptr or ctf_strraw because the new strtab
is not yet ready to put in its usual field (in a ctf_file_t that hasn't
even been allocated yet at this stage): but now we're using the external
strtab, this will no longer do because it'll be looking things up in the
wrong strtab, with disastrous results. Instead, pass the new internal
strtab in to a new ctf_strraw_explicit function which is just like
ctf_strraw except you can specify a ne winternal strtab to use.
But even now that it is using a new internal strtab, this is not quite
enough: it can't look up strings in the external strtab because ld
hasn't written it out yet, and when it does will write it straight to
disk. Instead, when we write the internal strtab, note all the offset
-> string mappings that we have noted belong in the *external* strtab to
a new "synthetic external strtab" dynhash, ctf_syn_ext_strtab, and look
in there at ctf_strraw time if it is set. This uses minimal extra
memory (because only strings in the external strtab that we actually use
are stored, and even those come straight out of the atoms table), but
let both variable sorting and name interning when ctf_bufopen is next
called work fine. (This also means that we don't need to filter out
spurious ECTF_STRTAB warnings from ctf_bufopen but can pass them back to
the caller, once we wrap ctf_bufopen so that we have a new internal
variant of ctf_bufopen etc that we can pass the synthetic external
strtab to. That error has been filtered out since the days of Solaris
libctf, which didn't try to handle the problem of getting external
strtabs right at construction time at all.)
v3: add the synthetic strtab and all associated machinery.
v5: fix tabdamage.
include/
* ctf.h (CTF_SET_STID): New.
libctf/
* ctf-impl.h (ctf_str_atom_t) <csa_offset>: New field.
(ctf_file_t) <ctf_syn_ext_strtab>: Likewise.
(ctf_str_add_ref): Name the last arg.
(ctf_str_add_external) New.
(ctf_str_add_strraw_explicit): Likewise.
(ctf_simple_open_internal): Likewise.
(ctf_bufopen_internal): Likewise.
* ctf-string.c (ctf_strraw_explicit): Split from...
(ctf_strraw): ... here, with new support for ctf_syn_ext_strtab.
(ctf_str_add_ref_internal): Return the atom, not the
string.
(ctf_str_add): Adjust accordingly.
(ctf_str_add_ref): Likewise. Move up in the file.
(ctf_str_add_external): New: update the csa_offset.
(ctf_str_count_strtab): Only account for strings with no csa_offset
in the internal strtab length.
(ctf_str_write_strtab): If the csa_offset is set, update the
string's refs without writing the string out, and update the
ctf_syn_ext_strtab. Make OOM handling less ugly.
* ctf-create.c (struct ctf_sort_var_arg_cb): New.
(ctf_update): Handle failure to populate the strtab. Pass in the
new ctf_sort_var arg. Adjust for ctf_syn_ext_strtab addition.
Call ctf_simple_open_internal, not ctf_simple_open.
(ctf_sort_var): Call ctf_strraw_explicit rather than looking up
strings by hand.
* ctf-hash.c (ctf_hash_insert_type): Likewise (but using
ctf_strraw). Adjust to diagnose ECTF_STRTAB nonetheless.
* ctf-open.c (init_types): No longer filter out ECTF_STRTAB.
(ctf_file_close): Destroy the ctf_syn_ext_strtab.
(ctf_simple_open): Rename to, and reimplement as a wrapper around...
(ctf_simple_open_internal): ... this new function, which calls
ctf_bufopen_internal.
(ctf_bufopen): Rename to, and reimplement as a wrapper around...
(ctf_bufopen_internal): ... this new function, which sets
ctf_syn_ext_strtab.
Nick Alcock [Sat, 13 Jul 2019 19:00:07 +0000 (20:00 +0100)]
libctf: Add iteration over non-root types
The existing function ctf_type_iter lets you iterate over root-visible
types (types you can look up by name). There is no way to iterate over
non-root-visible types, which is troublesome because both the linker
and dumper want to do that.
So add a new function that can do it: the callback it takes accepts
an extra parameter which indicates whether the type is root-visible
or not.
include/
* ctf-api.h (ctf_type_all_f): New.
(ctf_type_iter_all): New.
libctf/
* ctf_types.c (ctf_type_iter_all): New.
Nick Alcock [Sat, 13 Jul 2019 18:48:56 +0000 (19:48 +0100)]
binutils: objdump does not take --ctf-symbols or --ctf-strings options
libctf figures out what to load itself, with no overriding currently
possible, so remove the documentation of these nonexistent options.
Nick Alcock [Sat, 13 Jul 2019 18:47:11 +0000 (19:47 +0100)]
binutils: readelf: when dumping CTF, load strtab and symtab automatically
We were only loading them when explicitly requested, which leads to
strings that point off into empty space (into the non-loaded "external"
ELF string table). Avoid this unfortunate consequence by loading the
strtab and symtab by default, unless a blank name is given.
binutils/
* readelf.c (dump_ctf_symtab_name): Give default value.
(dump_ctf_strtab_name): Likewise.
(dump_section_as_ctf): Allow for the null string.
Nick Alcock [Thu, 11 Jul 2019 15:21:26 +0000 (16:21 +0100)]
libctf: add the object index and function index sections
No code handles these yet, but our latest GCC patches are generating
them, so we have to be ready for them or erroneously conclude that we
have file corruption.
(This simultaneously fixes a longstanding bug, concealed because nothing
was generating anything in the object or function info sections, where
the end of the section was being tested against the wrong thing: it
would have walked over the entire contents of the variable section and
treated them as part of the function info section. This had to change
now anyway because the new sections have landed in between.)
include/
* ctf.h: Add object index and function index sections. Describe
them. Improve the description of the variable section and clarify
the constraints on backward-pointing type nodes.
(ctf_header): Add cth_objtidxoff, cth_funcidxoff.
libctf/
* ctf-open.c (init_symtab): Check for overflow against the right
section.
(upgrade_header): Set cth_objtidxoff, cth_funcidxoff to zero-length.
(upgrade_types_v1): Note that these sections are not checked.
(flip_header): Endian-swap the header fields.
(flip_ctf): Endian-swap the sections.
(flip_objts): Update comment.
(ctf_bufopen): Check header offsets and alignment for validity.
Nick Alcock [Thu, 11 Jul 2019 15:26:54 +0000 (16:26 +0100)]
libctf, bfd: fix ctf_bfdopen_ctfsect opening symbol and string sections
The code in ctf_bfdopen_ctfsect (which is the ultimate place where you
end up if you use ctf_open to open a CTF file and pull in the ELF string
and symbol tables) was written before it was possible to actually test
it, since the linker was not written. Now it is, it turns out that the
previous code was completely nonfunctional: it assumed that you could
load the symbol table via bfd_section_from_elf_index (...,elf_onesymtab())
and the string table via bfd_section_from_elf_index on the sh_link.
Unfortunately BFD loads neither of these sections in the conventional
fashion it uses for most others: the symbol table is immediately
converted into internal form (which is useless for our purposes, since
we also have to work in the absence of BFD for readelf, etc) and the
string table is loaded specially via bfd_elf_get_str_section which is
private to bfd/elf.c.
So make this function public, export it in elf-bfd.h, and use it from
libctf, which does something similar to what bfd_elf_sym_name and
bfd_elf_string_from_elf_section do. Similarly, load the symbol table
manually using bfd_elf_get_elf_syms and throw away the internal form
it generates for us (we never use it).
BFD allocates the strtab for us via bfd_alloc, so we can leave BFD to
deallocate it: we allocate the symbol table ourselves before calling
bfd_elf_get_elf_syms, so we still have to free it.
Also change the rules around what you are allowed to provide: It is
useful to provide a string section but no symbol table, because CTF
sections can legitimately have no function info or data object sections
while relying on the ELF strtab for some of their strings. So allow
that combination.
v4: adjust to upstream changes. ctf_bfdopen_ctfsect's first parameter
is potentially unused again (if BFD is not in use for this link
due to not supporting an ELF target).
v5: fix tabdamage.
bfd/
* elf-bfd.h (bfd_elf_get_str_section): Add.
* elf.c (bfd_elf_get_str_section): No longer static.
libctf/
* ctf-open-bfd.c: Add <assert.h>.
(ctf_bfdopen_ctfsect): Open string and symbol tables using
techniques borrowed from bfd_elf_sym_name.
(ctf_new_archive_internal): Improve comment.
* ctf-archive.c (ctf_arc_close): Do not free the ctfi_strsect.
* ctf-open.c (ctf_bufopen): Allow opening with a string section but
no symbol section, but not vice versa.
Nick Alcock [Mon, 8 Jul 2019 12:59:15 +0000 (13:59 +0100)]
libctf, binutils: dump the CTF header
The CTF header has before now been thrown away too soon to be dumped
using the ctf_dump() machinery used by objdump and readelf: instead, a
kludge involving debugging-priority dumps of the header offsets on every
open was used.
Replace this with proper first-class dumping machinery just like
everything else in the CTF file, and have objdump and readelf use it.
(The dumper already had an enum value in ctf_sect_names_t for this
purpose, waiting to be used.)
v5: fix tabdamage.
libctf/
* ctf-impl.h (ctf_file_t): New field ctf_openflags.
* ctf-open.c (ctf_bufopen): Set it. No longer dump header offsets.
* ctf-dump.c (dump_header): New function, dump the CTF header.
(ctf_dump): Call it.
(ctf_dump_header_strfield): New function.
(ctf_dump_header_sectfield): Likewise.
binutils/
* objdump.c (dump_ctf_archive_member): Dump the CTF header.
* readelf.c (dump_section_as_ctf): Likewise.
Nick Alcock [Sat, 6 Jul 2019 16:36:21 +0000 (17:36 +0100)]
libctf: allow the header to change between versions
libctf supports dynamic upgrading of the type table as file format
versions change, but before now has not supported changes to the CTF
header. Doing this is complicated by the baroque storage method used:
the CTF header is kept prepended to the rest of the CTF data, just as
when read from the file, and written out from there, and is
endian-flipped in place.
This makes accessing it needlessly hard and makes it almost impossible
to make the header larger if we add fields. The general storage
machinery around the malloced ctf pointer (the 'ctf_base') is also
overcomplicated: the pointer is sometimes malloced locally and sometimes
assigned from a parameter, so freeing it requires checking to see if
that parameter was used, needlessly coupling ctf_bufopen and
ctf_file_close together.
So split the header out into a new ctf_file_t.ctf_header, which is
written out explicitly: squeeze it out of the CTF buffer whenever we
reallocate it, and use ctf_file_t.ctf_buf to skip past the header when
we do not need to reallocate (when no upgrading or endian-flipping is
required). We now track whether the CTF base can be freed explicitly
via a new ctf_dynbase pointer which is non-NULL only when freeing is
possible.
With all this done, we can upgrade the header on the fly and add new
fields as desired, via a new upgrade_header function in ctf-open.
As with other forms of upgrading, libctf upgrades older headers
automatically to the latest supported version at open time.
For a first use of this field, we add a new string field cth_cuname, and
a corresponding setter/getter pair ctf_cuname_set and ctf_cuname: this
is used by debuggers to determine whether a CTF section's types relate
to a single compilation unit, or to all compilation units in the
program. (Types with ambiguous definitions in different CUs have only
one of these types placed in the top-level shared .ctf container: the
rest are placed in much smaller per-CU containers, which have the shared
container as their parent. Since CTF must be useful in the absence of
DWARF, we store the names of the relevant CUs ourselves, so the debugger
can look them up.)
v5: fix tabdamage.
include/
* ctf-api.h (ctf_cuname): New function.
(ctf_cuname_set): Likewise.
* ctf.h: Improve comment around upgrading, no longer
implying that v2 is the target of upgrades (it is v3 now).
(ctf_header_v2_t): New, old-format header for backward
compatibility.
(ctf_header_t): Add cth_cuname: this is the first of several
header changes in format v3.
libctf/
* ctf-impl.h (ctf_file_t): New fields ctf_header, ctf_dynbase,
ctf_cuname, ctf_dyncuname: ctf_base and ctf_buf are no longer const.
* ctf-open.c (ctf_set_base): Preserve the gap between ctf_buf and
ctf_base: do not assume that it is always sizeof (ctf_header_t).
Print out ctf_cuname: only print out ctf_parname if set.
(ctf_free_base): Removed, ctf_base is no longer freed: free
ctf_dynbase instead.
(ctf_set_version): Fix spacing.
(upgrade_header): New, in-place header upgrading.
(upgrade_types): Rename to...
(upgrade_types_v1): ... this. Free ctf_dynbase, not ctf_base. No
longer track old and new headers separately. No longer allow for
header sizes explicitly: squeeze the headers out on upgrade (they
are preserved in fp->ctf_header). Set ctf_dynbase, ctf_base and
ctf_buf explicitly. Use ctf_free, not ctf_free_base.
(upgrade_types): New, also handle ctf_parmax updating.
(flip_header): Flip ctf_cuname.
(flip_types): Flip BUF explicitly rather than deriving BUF from
BASE.
(ctf_bufopen): Store the header in fp->ctf_header. Correct minimum
required alignment of objtoff and funcoff. No longer store it in
the ctf_buf unless that buf is derived unmodified from the input.
Set ctf_dynbase where ctf_base is dynamically allocated. Drop locals
that duplicate fields in ctf_file: move allocation of ctf_file
further up instead. Call upgrade_header as needed. Move
version-specific ctf_parmax initialization into upgrade_types. More
concise error handling.
(ctf_file_close): No longer test for null pointers before freeing.
Free ctf_dyncuname, ctf_dynbase, and ctf_header. Do not call
ctf_free_base.
(ctf_cuname): New.
(ctf_cuname_set): New.
* ctf-create.c (ctf_update): Populate ctf_cuname.
(ctf_gzwrite): Write out the header explicitly. Remove obsolescent
comment.
(ctf_write): Likewise.
(ctf_compress_write): Get the header from ctf_header, not ctf_base.
Fix the compression length: fp->ctf_size never counted the CTF
header. Simplify the compress call accordingly.
Nick Alcock [Tue, 16 Jul 2019 09:42:37 +0000 (10:42 +0100)]
libctf, include: ChangeLog format fixes
Double-spaces before email addresses were consistently missing.
Hans-Peter Nilsson [Thu, 11 Jul 2019 04:11:09 +0000 (00:11 -0400)]
libctf: make it compile for old glibc
With a glibc before 2.9 (such as 2.8), there's <endian.h> but no
htole64 or le64toh, so you get, compiling binutils for any target:
libtool: link: gcc -W -Wall -Wstrict-prototypes -Wmissing-prototypes \
-Wshadow -Werror -I/x/binutils/../zlib -g -O2 -o objdump \
objdump.o dwarf.o prdbg.o rddbg.o debug.o stabs.o rdcoff.o \
bucomm.o version.o filemode.o elfcomm.o ../opcodes/.libs/libopcodes.a \
../libctf/libctf.a ../bfd/.libs/libbfd.a -L/x/obj/b/zlib -lz ../libiberty/libiberty.a -ldl
../libctf/libctf.a(ctf-archive.o): In function `ctf_archive_raw_iter_internal':
/x/src/libctf/ctf-archive.c:543: undefined reference to `le64toh'
/x/src/libctf/ctf-archive.c:550: undefined reference to `le64toh'
/x/src/libctf/ctf-archive.c:551: undefined reference to `le64toh'
/x/src/libctf/ctf-archive.c:551: undefined reference to `le64toh'
/x/src/libctf/ctf-archive.c:554: undefined reference to `le64toh'
../libctf/libctf.a(ctf-archive.o):/x/src/libctf/ctf-archive.c:545: more undefined references to `le64toh' follow
(etc)
Also, I see no bswap_identity_64 *anywhere* except in libctf/swap.h
(including current glibc) and I don't think calling an "identity"-
function is better than just plain "#define foo(x) (x)" anyway.
(Where does the idea of a bytestap.h bswap_identity_64 come from?)
Speaking of that, I should mention that I instrumented the condition
to observe that the WORDS_BIGENDIAN case passes too for a presumed
big-endian target and glibc-2.8: there is a bswap_64 present for that
version. Curiously, no test-case regressed with that instrumentation.
For the record, constructing binary blobs using text source to run
tests on, can be done by linking to --oformat binary (with most ELF
targets), but I guess that's seen as unnecessary roundabout perhaps
checking in binary files in the test-suite would be ok these days.
[...]
[nca: trimmed commit log slightly, updated changelog]
v5: fix tabdamage.
libctf/
* ctf-endian.h: Don't assume htole64 and le64toh are always
present if HAVE_ENDIAN_H; also check if htole64 is defined.
[!WORDS_BIGENDIAN] (htole64, le64toh): Define as identity,
not bswap_identity_64.
Andrew Burgess [Tue, 10 Sep 2019 14:24:28 +0000 (15:24 +0100)]
gdb: Don't ignore all SIGSTOP when the signal handler is set to pass
It was observed that in a multi-threaded application on GNU/Linux,
that if the user has set the SIGSTOP to be pass (using GDB's handle
command) then the inferior would hang upon hitting a breakpoint.
What happens is that when a thread hits the breakpoint GDB tries to
stop all of the other threads by sending them a SIGSTOP and setting
the stop_requested flag in the target_ops structure - this can be seen
in infrun.c:stop_all_threads.
GDB then waits for all of the other threads to stop.
When the SIGSTOP event arrives we eventually end up in
linux-nat.c:linux_nat_filter_event, which has the job of deciding if
the event we're looking at (the SIGSTOP arriving in this case) is
something that should be reported back to the core of GDB.
One of the final actions of this function is to check if we stopped
due to a signal, and if we did, and the signal has been set to 'pass'
by the user then we ignore the event and resume the thread.
This code already has some conditions in place that mean the event is
reported to GDB even if the signal is in the set of signals to be
passed to the inferior.
In this commit I extend this condition such that:
If the signal is a SIGSTOP, and the thread's stop_requested flag is
set (indicating we're waiting for the thread to stop with a SIGSTOP)
then we should report this SIGSTOP to GDB and not pass it to the
inferior.
With this change in place the test now passes. Regression tested on
x86-64 GNU/Linux with no regressions.
gdb/ChangeLog:
* linux-nat.c (linux_nat_filter_event): Don't ignore SIGSTOP if we
have just sent the thread a SIGSTOP and are waiting for it to
arrive.
gdb/testsuite/ChangeLog:
* gdb.threads/stop-with-handle.c: New file.
* gdb.threads/stop-with-handle.exp: New file.
Tom de Vries [Thu, 3 Oct 2019 14:22:09 +0000 (16:22 +0200)]
[gdb/testsuite] Fix list-missing-source.exp with gcc 4.8
With gcc 4.8.1, we see this FAIL:
...
(gdb) PASS: gdb.base/list-missing-source.exp: list
info source^M
Current source file is outputs/gdb.base/list-missing-source/main.c^M
Source language is c.^M
Producer is GNU C 4.8.5 -mtune=generic -march=x86-64 -g -fno-stack-protector.^M
Compiled with DWARF 2 debugging format.^M
Does not include preprocessor macro info.^M
(gdb) FAIL: gdb.base/list-missing-source.exp: info source
...
The problem is that a "Compilation directory is <dir>" line is expected, but
this is missing due to the fact the the compilation unit for main.c doesn't
contain a DW_AT_comp_dir in the DW_TAG_compile_unit DIE.
Fix this by allowing the "Compilation directory" line to be missing.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2019-10-03 Tom de Vries <tdevries@suse.de>
PR testsuite/25059
* gdb.base/list-missing-source.exp: Allowing the "Compilation
directory" line to be missing.
Tom de Vries [Thu, 3 Oct 2019 13:02:58 +0000 (15:02 +0200)]
[gdb/testsuite] Fix info-types.exp with gcc/g++ 4.8
The gdb.base/info-types.exp test-case FAILs with gcc/g++ 4.8 because the DWARF
record for the 'unsigned int' type is missing in the executables, while it is
present for gcc/g++ 7.4.1.
For a minimal example using gcc 7.4.1:
...
$ echo "enum enum_t { AA, BB, CC }; enum enum_t var;" > enum.c
$ gcc enum.c -c -g
...
we find that the enum type has DW_AT_encoding 'unsigned':
<1><1d>: Abbrev Number: 2 (DW_TAG_enumeration_type)
<1e> DW_AT_name : (indirect string, offset: 0x1f): enum_t
<22> DW_AT_encoding : 7 (unsigned)
<23> DW_AT_byte_size : 4
<24> DW_AT_type : <0x3e>
<28> DW_AT_decl_file : 1
<29> DW_AT_decl_line : 1
<2a> DW_AT_sibling : <0x3e>
...
and a DW_AT_type reference to the type 'unsigned int':
...
<1><3e>: Abbrev Number: 4 (DW_TAG_base_type)
<3f> DW_AT_byte_size : 4
<40> DW_AT_encoding : 7 (unsigned)
<41> DW_AT_name : (indirect string, offset: 0x26): unsigned int
...
With gcc 4.8.5 however, we have no 'unsigned' encoding, and no DW_AT_type:
...
<1><1d>: Abbrev Number: 2 (DW_TAG_enumeration_type)
<1e> DW_AT_name : (indirect string, offset: 0x1f): enum_t
<22> DW_AT_byte_size : 4
<23> DW_AT_decl_file : 1
<24> DW_AT_decl_line : 1
<25> DW_AT_sibling : <0x39>
...
as well as no record for 'unsigned int'.
Make the test-case pass with gcc/g++ 4.8 by making the presence of the
'unsigned int' type optional.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2019-10-03 Tom de Vries <tdevries@suse.de>
PR testsuite/25059
* gdb.base/info-types.exp: Make the presence of the 'unsigned int'
type optional.
Andrew Burgess [Wed, 2 Oct 2019 21:01:46 +0000 (22:01 +0100)]
gdb: Remove whitespace in 'std::vector <...>'
In the following 3 commits:
commit
df07e2c772dab40d268dc44c78bb087c4b75b3c6
Date: Wed Sep 25 16:10:50 2019 +0100
gdb: Remove a use of VEC from dwarf2read.{c,h}
commit
554ac434b02465f1fc925b0ae3393fb841e0d59c
Date: Thu Sep 19 13:17:59 2019 -0400
gdb: Change a VEC to std::vector in btrace.{c,h}
commit
46f29a9a260da1a03176682aff63bad03d8f2e8b
Date: Mon Sep 16 09:12:27 2019 -0400
gdb: Remove a VEC from gdbsupport/btrace-common.h
I incorrectly wrote 'std::vector <...>' instead of 'std::vector<...>',
this commit fixes this mistake. There should be no user visible
changes after this commit.
gdb/ChangeLog:
* btrace.c (btrace_add_pc): Remove whitespace before the template
parameter in 'std::vector <...>'.
(parse_xml_btrace_block): Likewise.
(btrace_maint_decode_pt): Likewise.
(btrace_maint_update_packets): Likewise.
(btrace_maint_print_packets): Likewise.
* btrace.h (struct btrace_maint_info): Likewise.
* dwarf2read.c (struct type_unit_group): Likewise.
(build_type_psymtabs_reader): Likewise.
* gdbsupport/btrace-common.c (btrace_data_append): Likewise.
* gdbsupport/btrace-common.h (struct btrace_data_bts): Likewise.
* nat/linux-btrace.c (perf_event_read_bts): Likewise.
Tom de Vries [Thu, 3 Oct 2019 08:15:39 +0000 (10:15 +0200)]
[gdb] Fix set/show style metadata help text
There's a recent regression:
...
FAIL: gdb.gdb/unittest.exp: maintenance selftest
...
In more detail:
...
Running selftest help_doc_invariants.^M
help doc broken invariant: command 'set style metadata' help doc first line \
is not terminated with a '.' character^M
help doc broken invariant: command 'show style metadata' help doc first line \
is not terminated with a '.' character^M
Self test failed: self-test failed at gdb/unittests/help-doc-selftests.c:95^M
...
Fix this by adding a '.' at the end of the first line of the help text for
set/show style metadata.
Tested on x86_64-linux.
gdb/ChangeLog:
2019-10-03 Tom de Vries <tdevries@suse.de>
* cli/cli-style.c (_initialize_cli_style): Adding a '.' at the end of
the first line of the help text for set/show style metadata.
GDB Administrator [Thu, 3 Oct 2019 00:00:20 +0000 (00:00 +0000)]
Automatic date update in version.in
Christian Biesinger [Tue, 1 Oct 2019 19:50:54 +0000 (14:50 -0500)]
Convert boolean globals in server.c to bool
Converts the int globals to bool.
gdb/gdbserver/ChangeLog:
2019-10-02 Christian Biesinger <cbiesinger@google.com>
* server.c (server_waiting): Change to bool.
(extended_protocol): Likewise.
(response_needed): Likewise.
(exit_requested): Likewise.
(run_once): Likewise.
(report_no_resumed): Likewise.
(non_stop): Likewise.
(disable_packet_vCont): Likewise.
(disable_packet_Tthread): Likewise.
(disable_packet_qC): Likewise.
(disable_packet_qfThreadInfo): Likewise.
(handle_general_set): Update.
(handle_detach): Update.
(handle_monitor_command): Update.
(handle_query): Update.
(captured_main): Update.
(process_serial_event): Update.
* server.h (server_waiting): Change to bool.
(disable_packet_vCont): Likewise.
(disable_packet_Tthread): Likewise.
(disable_packet_qC): Likewise.
(disable_packet_qfThreadInfo): Likewise.
(run_once): Likewise.
(non_stop): Likewise.
* target.c (target_stop_and_wait): Update.
Tom Tromey [Tue, 1 Oct 2019 12:52:44 +0000 (06:52 -0600)]
Fix type of startup_with_shell in gdbserver
startup_with_shell was changed to be of "bool" type, but I noticed
that the definition in gdbserver disagreed. This disagreement caused
some regressions on a big-endian machine.
This patch removes the redundant declaration and definition of
startup_with_shell and ensures that such clashes will be diagnosed.
This moves the declaration to common-inferior.h, and introduces a new
common-inferior.c, as suggested by Pedro.
gdb/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* Makefile.in (COMMON_SFILES): Add common-inferior.c.
* gdbsupport/common-inferior.c: New file.
* infcmd.c (startup_with_shell): Don't define.
* nat/fork-inferior.h (startup_with_shell): Don't declare.
* gdbsupport/common-inferior.h (startup_with_shell): Declare.
* inferior.h (startup_with_shell): Don't declare.
gdb/gdbserver/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* Makefile.in (SFILES): Add common-inferior.c.
(OBS): Add common-inferior.o.
* server.c (startup_with_shell): Don't define.
Christian Biesinger [Tue, 1 Oct 2019 18:36:07 +0000 (13:36 -0500)]
Add missing includes to gdb_assert.h and gdb_string_view.h
gdb::string_view uses gdb_assert, so it should include that header.
And gdb_assert uses internal_error, so it should include errors.h.
gdb/ChangeLog:
2019-10-02 Christian Biesinger <cbiesinger@google.com>
* gdbsupport/gdb_assert.h: Include errors.h.
* gdbsupport/gdb_string_view.h: Include gdb_assert.h.
Andreas Arnez [Wed, 2 Oct 2019 18:01:44 +0000 (20:01 +0200)]
gdb/testsuite: Fix py-format-string.exp on big-endian platforms
GDB's py-format-string test case depends on endianness. In particular it
relies on the first byte of the machine representation of 42 (as an int)
to be 42 as well. While this is indeed the case for little-endian
machines, big-endian machines store a zero in the first byte instead. The
wrong assumption leads to lots of FAILs on such architectures.
Fix this by filling the affected union with bytes of the same value, such
that endianness does not matter. Use the value 42, to keep the character
in the first byte unchanged.
gdb/testsuite/ChangeLog:
* gdb.python/py-format-string.c (string.h): New include.
(main): Fill a_struct_with_union.the_union.an_int with bytes of
the same value, for endianness-independence.
* gdb.python/py-format-string.exp (default_regexp_dict)
(test_pretty_structs, test_format): Adjust expected output to the
changed initialization.
Tom Tromey [Fri, 31 May 2019 20:50:23 +0000 (14:50 -0600)]
Add $_ada_exception convenience variable
This adds the $_ada_exception convenience variable. It is set by the
Ada exception catchpoints, and holds the address of the exception
currently being thrown. This is useful because it allows more
fine-grained filtering of exceptions than is possible using the
existing "catch" syntax.
This also simplifies Ada catchpoints somewhat; because the catchpoint
must now carry the "kind", it's possible to remove many helper
functions.
gdb/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* NEWS: Add $_ada_exception entry.
* ada-lang.c (struct ada_catchpoint): Add constructor.
<m_kind>: New member.
(allocate_location_exception, re_set_exception): Remove
"ex" parameter.
(should_stop_exception): Compute $_ada_exception.
(check_status_exception, print_it_exception)
(print_one_exception, print_mention_exception): Remove
"ex" parameter.
(allocate_location_catch_exception, re_set_catch_exception)
(check_status_exception, print_it_catch_exception)
(print_one_catch_exception, print_mention_catch_exception)
(print_recreate_catch_exception)
(allocate_location_catch_exception_unhandled)
(re_set_catch_exception_unhandled)
(check_status_exception, print_it_catch_exception_unhandled)
(print_one_catch_exception_unhandled)
(print_mention_catch_exception_unhandled)
(print_recreate_catch_exception_unhandled)
(allocate_location_catch_assert, re_set_catch_assert)
(check_status_assert, print_it_catch_assert)
(print_one_catch_assert, print_mention_catch_assert)
(print_recreate_catch_assert)
(allocate_location_catch_handlers, re_set_catch_handlers)
(check_status_handlers, print_it_catch_handlers)
(print_one_catch_handlers, print_mention_catch_handlers)
(print_recreate_catch_handlers): Remove.
(create_ada_exception_catchpoint): Update.
(initialize_ada_catchpoint_ops): Update.
gdb/doc/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* gdb.texinfo (Set Catchpoints, Convenience Vars): Document
$_ada_exception.
gdb/testsuite/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* gdb.ada/catch_ex_std.exp: Add $_ada_exception test.
Tom Tromey [Fri, 14 Jun 2019 13:45:01 +0000 (07:45 -0600)]
Back out earlier Ada exception change
commit
2ff0a9473 (Fix "catch exception" with dynamic linking) changed
how ada-lang.c creates expressions to determine if an exception
catchpoint should stop.
That patch is no longer needed now that copy relocations are handled
more directly.
gdb/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* ada-lang.c (ada_lookup_simple_minsyms): Remove.
(create_excep_cond_exprs): Simplify exception string computation.
(ada_exception_catchpoint_cond_string): Likewise.
Pedro Alves [Sat, 20 Jul 2019 00:20:35 +0000 (01:20 +0100)]
Make print-file-var.exp test attribute visibility hidden, dlopen, and main symbol
Make gdb.base/print-file-var.exp test all combinations of:
- attribute hidden in the this_version_id symbols or not
- dlopen or not
- this_version_id symbol in main file or not
- C++
gdb/testsuite/ChangeLog
2019-10-02 Pedro Alves <palves@redhat.com>
Andrew Burgess <andrew.burgess@embecosm.com>
* gdb.base/print-file-var-lib1.c: Include <stdio.h> and
"print-file-var.h".
(this_version_id) Use ATTRIBUTE_VISIBILITY.
(get_version_1): Print this_version_id and its address.
Add extern "C" wrappers around interface functions.
* gdb.base/print-file-var-lib2.c: Include <stdio.h> and
"print-file-var.h".
(this_version_id) Use ATTRIBUTE_VISIBILITY.
(get_version_2): Print this_version_id and its address.
Add extern "C" wrappers around interface functions.
* gdb.base/print-file-var-main.c: Include <dlfcn.h>, <assert.h>,
<stddef.h> and "print-file-var.h".
Add extern "C" wrappers around interface functions.
[VERSION_ID_MAIN] (this_version_id): Define.
(main): Define v0. Use dlopen if SHLIB_NAME is defined.
* gdb.base/print-file-var.h: Add some #defines to simplify setting
up extern "C" blocks.
* gdb.base/print-file-var.exp (test): New, factored out from top
level.
(top level): Test all combinations of attribute hidden or not,
dlopen or not, and this_version_id symbol in main file or not.
Compile tests as both C++ and C, make test names unique.
Tom Tromey [Tue, 25 Jun 2019 18:50:45 +0000 (12:50 -0600)]
Handle copy relocations
In ELF, if a data symbol is defined in a shared library and used by
the main program, it will be subject to a "copy relocation". In this
scenario, the main program has a copy of the symbol in question, and a
relocation that tells ld.so to copy the data from the shared library.
Then the symbol in the main program is used to satisfy all references.
This patch changes gdb to handle this scenario. Data symbols coming
from ELF shared libraries get a special flag that indicates that the
symbol's address may be subject to copy relocation.
I looked briefly into handling copy relocations by looking at the
actual relocations in the main program, but this seemed difficult to
do with BFD.
Note that no caching is done here. Perhaps this could be changed if
need be; I wanted to avoid possible problems with either objfile
lifetimes and changes, or conflicts with the long-term (vapor-ware)
objfile splitting project.
gdb/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* symmisc.c (dump_msymbols): Don't use MSYMBOL_VALUE_ADDRESS.
* ada-lang.c (lesseq_defined_than): Handle
LOC_STATIC.
* dwarf2read.c (dwarf2_per_objfile): Add can_copy
parameter.
(dwarf2_has_info): Likewise.
(new_symbol): Set maybe_copied on symbol when
appropriate.
* dwarf2read.h (dwarf2_per_objfile): Add can_copy
parameter.
<can_copy>: New member.
* elfread.c (record_minimal_symbol): Set maybe_copied
on symbol when appropriate.
(elf_symfile_read): Update call to dwarf2_has_info.
* minsyms.c (lookup_minimal_symbol_linkage): New
function.
* minsyms.h (lookup_minimal_symbol_linkage): Declare.
* symtab.c (get_symbol_address, get_msymbol_address):
New functions.
* symtab.h (get_symbol_address, get_msymbol_address):
Declare.
(SYMBOL_VALUE_ADDRESS, MSYMBOL_VALUE_ADDRESS): Handle
maybe_copied.
(struct symbol, struct minimal_symbol) <maybe_copied>:
New member.
Tom Tromey [Thu, 1 Aug 2019 15:34:40 +0000 (09:34 -0600)]
Make current_source_* per-program-space
This changes current_source_symtab and current_source_line to be
per-program-space. This ensures that switching inferiors will
preserve the current "list" location for that inferior, and also
ensures that the default expression evaluation context always comes
with the current inferior.
No test case, because the latter problem crops up with an existing
gdb.multi test case once this entire series has been applied.
gdb/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* source.c (struct current_source_location): New.
(current_source_key): New global.
(current_source_symtab, current_source_line)
(current_source_pspace): Remove.
(get_source_location): New function.
(get_current_source_symtab_and_line)
(set_default_source_symtab_and_line)
(set_current_source_symtab_and_line)
(clear_current_source_symtab_and_line, select_source_symtab)
(info_source_command, print_source_lines_base)
(info_line_command, search_command_helper, _initialize_source):
Update.
Tom Tromey [Thu, 1 Aug 2019 15:17:14 +0000 (09:17 -0600)]
Don't call decode_line_with_current_source from select_source_symtab
select_source_symtab currently calls decode_line_with_current_source.
However, this function iterates over all program spaces, and so it is
possible that it will return a "main" from some other program space.
This patch changes select_source_symtab to simply use the symbol it
already found in the current program space.
gdb/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* source.c (select_source_symtab): Don't call
decode_line_with_current_source.
Andrew Burgess [Wed, 31 Jul 2019 19:05:37 +0000 (13:05 -0600)]
Search global block from basic_lookup_symbol_nonlocal
This changes lookup_global_symbol to look in the global block
of the passed-in block. If no block was passed in, it reverts to the
previous behavior.
This change is needed to ensure that 'FILENAME'::NAME lookups work
properly. As debugging Pedro's test case showed, this was not working
properly in the case where multiple identical names could be found
(the one situation where this feature is truly needed :-).
This also removes some old comments from basic_lookup_symbol_nonlocal
that no longer apply.
Note that the new test cases for this change will appear in a later
patch. They are in gdb.base/print-file-var.exp.
gdb/ChangeLog
2019-10-02 Andrew Burgess <andrew.burgess@embecosm.com>
* symtab.c (lookup_global_symbol): Search global block.
Tom Tromey [Tue, 25 Jun 2019 17:53:11 +0000 (11:53 -0600)]
Change SYMBOL_VALUE_ADDRESS to be an rvalue
This changes SYMBOL_VALUE_ADDRESS to be an rvalue. The symbol readers
generally assign using this, so this also introduces
SET_SYMBOL_VALUE_ADDRESS and updates the readers. Making this change
is useful in a subsequent patch, which redefined SYMBOL_VALUE_ADDRESS.
gdb/ChangeLog
2019-10-02 Tom Tromey <tromey@adacore.com>
* coffread.c (process_coff_symbol): Update.
* dwarf2read.c (var_decode_location, new_symbol): Update.
* mdebugread.c (parse_symbol): Update.
* objfiles.c (relocate_one_symbol): Update.
* stabsread.c (define_symbol, fix_common_block)
(scan_file_globals): Update.
* symtab.h (SYMBOL_VALUE_ADDRESS): Expand to an rvalue.
(SET_SYMBOL_VALUE_ADDRESS): New macro.
* xcoffread.c (process_xcoff_symbol): Update.
Andreas Arnez [Wed, 2 Oct 2019 14:01:44 +0000 (16:01 +0200)]
Update my email address in gdb/MAINTAINERS
My email address at IBM has changed from arnez@linux.vnet.ibm.com to
arnez@linux.ibm.com. Reflect that in the MAINTAINERS file.
gdb/ChangeLog:
* MAINTAINERS: Update my email address.
Alan Modra [Mon, 23 Sep 2019 13:31:37 +0000 (23:01 +0930)]
-Bsymbolic is not for PIEs
Despite PR19615, it doesn't make sense to use -Bsymbolic with PIEs.
Dynamic symbols in an executable won't be overridden anyway.
* ld.texi (-Bsymbolic, -Bsymbolic-functions): Don't mention PIEs.
* ld.h (symbolic_enum, dynamic_list_enum),
(args_type <symbolic, dynamic_list>): Move to..
* lexsup.c (parse_args): ..here, using auto vars opt_symbolic
and opt_dynamic_list rather than command_line fields. Only
act on -Bsymbolic and -Bsymbolic-functions for shared library
output. Free dynamic_list.
Andrew Burgess [Wed, 25 Sep 2019 15:10:50 +0000 (16:10 +0100)]
gdb: Remove a use of VEC from dwarf2read.{c,h}
Removes a use of VEC from dwarf2read.{c,h} and replaces it with
std::vector. As far as possible this is a like for like replacement
with minimal refactoring.
There should be no user visible changes after this commit.
gdb/ChangeLog:
* dwarf2read.c (struct type_unit_group) <tus>: Convert to
std::vector.
(build_type_psymtabs_reader): Update for std::vector.
(build_type_psymtab_dependencies): Likewise.
* dwarf2read.h: Remove use of DEF_VEC_P.
(typedef sig_type_ptr): Delete.
Andrew Burgess [Thu, 19 Sep 2019 17:17:59 +0000 (13:17 -0400)]
gdb: Change a VEC to std::vector in btrace.{c,h}
Replace a VEC with a std::vector in btrace.h, and update btrace.c to
match. It is worth noting that this code appears to be currently
untested by the GDB testsuite. I've tried to do a like for like
replacement when moving to std::vector, with minimal refactoring to
try and avoid introducing any bugs.
As the new vector is inside a union I've currently used a pointer to
vector, which makes the code slightly uglier than it might otherwise
be, but again, due to lack of testing I'm reluctant to start
refactoring the code in a big way.
gdb/ChangeLog:
* btrace.c (btrace_maint_clear): Update to handle change from VEC
to std::vector.
(btrace_maint_decode_pt): Likewise, and move allocation of the
vector outside of the loop.
(btrace_maint_update_packets): Update to handle change from VEC to
std::vector.
(btrace_maint_print_packets): Likewise.
(maint_info_btrace_cmd): Likewise.
* btrace.h: Remove use of DEF_VEC_O.
(typedef btrace_pt_packet_s): Delete.
(struct btrace_maint_info) <packets>: Change fromm VEC to
std::vector.
* gdbsupport/btrace-common.h: Remove 'vec.h' include.
Andrew Burgess [Mon, 16 Sep 2019 13:12:27 +0000 (09:12 -0400)]
gdb: Remove a VEC from gdbsupport/btrace-common.h
Converts a VEC into a std::vector in gdbsupport/btrace-common.h. This
commit just performs a mechanical conversion and doesn't do any
refactoring. One consequence of this is that the std::vector must
actually be a pointer to std::vector as it is placed within a union.
It might be possible in future to refactor to a class hierarchy and
remove the need for a union, but I'd rather have that be a separate
change to make it easier to see the evolution of the code.
gdb/ChangeLog:
* btrace.c (btrace_compute_ftrace_bts): Update for std::vector,
make accesses into the vector constant references.
(btrace_add_pc): Update for std::vector.
(btrace_stitch_bts): Likewise.
(parse_xml_btrace_block): Likewise.
(btrace_maint_update_packets): Likewise.
(btrace_maint_print_packets): Likewise.
(maint_info_btrace_cmd): Likewise.
* gdbsupport/btrace-common.c (btrace_data::fini): Update for
std::vector.
(btrace_data::empty): Likewise.
(btrace_data_append): Likewise.
* gdbsupport/btrace-common.h: Remove use of DEF_VEC_O.
(typedef btrace_block_s): Delete.
(struct btrace_block): Add constructor.
(struct btrace_data_bts) <blocks>: Change to std::vector.
* nat/linux-btrace.c (perf_event_read_bts): Update for
std::vector.
(linux_read_bts): Likewise.
gdb/gdbserver/ChangeLog:
* linux-low.c (linux_low_read_btrace): Update for change to
std::vector.
Nick Clifton [Wed, 2 Oct 2019 10:55:02 +0000 (11:55 +0100)]
Change objcopy's --set-section-alignment option to take a byte alignment value rather than a power of two alignment value.
PR 24942
* objcopy.c (copy_usage): Update description of
--set-section-alignment.
(copy_main): Interpret numeric argument of --set-section-alignment
as a byte alignment, not a power of two alignment.
* doc/binutils.texi: Update description of
--set-section-alignment.
* testsuite/binutils-all/set-section-alignment.d: New test.
* testsuite/binutils-all/objcopy.exp: Run the new test.
GDB Administrator [Wed, 2 Oct 2019 00:00:22 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom Tromey [Thu, 19 Sep 2019 13:31:28 +0000 (07:31 -0600)]
Use styled_string for "show logging filename"
This changes "show logging filename" to style its output.
gdb/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* cli/cli-logging.c (show_logging_filename): Use styled_string.
gdb/testsuite/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* gdb.base/style.exp: Test "show logging filename".
Tom Tromey [Wed, 18 Sep 2019 01:11:55 +0000 (19:11 -0600)]
Use styled_string in more places
This adds more uses of styled_string, changing gdb to style some
output that was previously left unstyled.
gdb/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* stack.c (print_frame, info_frame_command_core): Use
styled_string.
* linux-thread-db.c (try_thread_db_load_1)
(try_thread_db_load_from_pdir_1): Use styled_string.
* auto-load.c (file_is_auto_load_safe, execute_script_contents)
(auto_load_section_scripts, info_auto_load_local_gdbinit)
(maybe_print_unsupported_script_warning)
(maybe_print_script_not_found_warning): Use styled_string.
* ada-lang.c (user_select_syms): Use styled_string.
Tom Tromey [Wed, 3 Apr 2019 02:00:18 +0000 (20:00 -0600)]
Introduce metadata style
This introduces a new "metadata" style and changes many places in gdb
to use it. The idea here is to let the user distinguish gdb output
from output that (conceptually at least) comes directly from the
inferior. The newly-styled category includes text that gdb
traditionally surrounds in "<...>", like "<unavailable>".
I only added a single test for this. In many cases this output is
difficult to test. Also, while developing this errors in the
implementation of the new printf formats showed up as regressions.
gdb/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* p-lang.c (pascal_printstr): Use metadata style.
* value.c (show_convenience): Use metadata style.
* valprint.c (valprint_check_validity, val_print_optimized_out)
(val_print_not_saved, val_print_unavailable)
(val_print_invalid_address, generic_val_print, val_print)
(value_check_printable, val_print_array_elements): Use metadata
style.
* ui-out.h (class ui_out) <field_fmt>: New overload.
<do_field_fmt>: Add style parameter.
* ui-out.c (ui_out::field_fmt): New overload.
* typeprint.c (type_print_unknown_return_type)
(val_print_not_allocated, val_print_not_associated): Use metadata
style.
* tui/tui-out.h (class tui_ui_out) <do_field_fmt>: Add style
parameter.
* tui/tui-out.c (tui_ui_out::do_field_fmt): Update.
* tracepoint.c (tvariables_info_1): Use metadata style.
* stack.c (print_frame_arg, print_frame_info, print_frame)
(info_frame_command_core): Use metadata style.
* skip.c (info_skip_command): Use metadata style.
* rust-lang.c (rust_print_enum): Use metadata style.
* python/py-prettyprint.c (print_stack_unless_memory_error): Use
metadata style.
* python/py-framefilter.c (py_print_single_arg): Use metadata
style.
* printcmd.c (do_one_display, print_variable_and_value): Use
metadata style.
* p-valprint.c (pascal_val_print)
(pascal_object_print_value_fields): Use metadata style.
* p-typeprint.c (pascal_type_print_base): Use metadata style.
* mi/mi-out.h (class mi_ui_out) <do_field_fmt>: Add style
parameter.
* mi/mi-out.c (mi_ui_out::do_field_fmt): Update.
* m2-valprint.c (m2_print_long_set): Use metadata style.
* m2-typeprint.c (m2_print_type): Use metadata style.
* infcmd.c (print_return_value_1): Use metadata style.
* gnu-v3-abi.c (print_one_vtable): Use metadata style.
* f-valprint.c (info_common_command_for_block): Use metadata
style.
* f-typeprint.c (f_type_print_base): Use metadata style.
* expprint.c (print_subexp_standard): Use metadata style.
* cp-valprint.c (cp_print_value_fields): Use metadata style.
* cli/cli-style.h (class cli_style_option): Add constructor.
(metadata_style): Declare.
* cli/cli-style.c (metadata_style): New global.
(_initialize_cli_style): Register metadata style.
* cli-out.h (class cli_ui_out) <do_field_fmt>: Add style
parameter.
* cli-out.c (cli_ui_out::do_field_fmt): Update.
* c-typeprint.c (c_type_print_base_struct_union)
(c_type_print_base_1): Use metadata style.
* breakpoint.c (watchpoint_value_print)
(print_one_breakpoint_location): Use metadata style.
* break-catch-syscall.c (print_one_catch_syscall): Use metadata
style.
* break-catch-sig.c (signal_catchpoint_print_one): Use metadata
style.
* ada-valprint.c (val_print_packed_array_elements, printstr)
(print_field_values, ada_val_print_ref, ada_val_print): Use
metadata style.
* ada-typeprint.c (print_array_type, ada_print_type): Use metadata
style.
* ada-tasks.c (print_ada_task_info, info_task): Use metadata
style.
* ada-lang.c (user_select_syms): Use metadata style.
gdb/testsuite/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* lib/gdb-utils.exp (style): Handle "metadata" argument.
* gdb.base/style.exp: Add metadata style test.
Tom Tromey [Wed, 5 Jun 2019 02:00:40 +0000 (20:00 -0600)]
Style "pwd" output
This changes the "pwd" command to style its output.
gdb/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* cli/cli-cmds.c (pwd_command): Style output.
gdb/testsuite/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* gdb.base/style.exp: Test "pwd".
Pedro Alves [Tue, 17 Sep 2019 23:03:28 +0000 (17:03 -0600)]
Use new %p format suffixes in gdb
This changes various spots in gdb to use the new %p format suffixes.
gdb/ChangeLog
2019-10-01 Pedro Alves <palves@redhat.com>
Tom Tromey <tom@tromey.com>
* symtab.c (print_symbol_info): Use %ps.
(print_msymbol_info): Use %ps.
* symfile.c (symbol_file_add_with_addrs): Use %ps.
* printcmd.c (print_variable_and_value): Use %ps.
* macrocmd.c (show_pp_source_pos): Use %ps.
* infrun.c (print_exited_reason): Use ui_out::message.
* breakpoint.c (watchpoint_check, print_one_breakpoint_location)
(describe_other_breakpoints): Use ui_out::message and new
formats.
(say_where): Use new formats.
(bkpt_print_it, tracepoint_print_one_detail): Use ui_out::message
and new formats.
Pedro Alves [Wed, 5 Jun 2019 08:17:16 +0000 (09:17 +0100)]
Introduce gdb-specific %p format suffixes
This introduces a few gdb-specific %p format suffixes. This is useful
for emitting gdb-specific output in an ergonomic way. It also yields
code that is more i18n-friendly.
The comment before ui_out::message explains the details.
Note that the tests had to change a little. When using one of the gdb
printf functions with styling, there can be spurious style changes
emitted to the output. This did not seem worthwhile to fix, as the
low-level output functions are rather spaghetti-ish already, and I
didn't want to make them even worse.
This change also necessitated adding support for "*" as precision and
width in format_pieces. These are used in various spots in gdb, and
it seemed better to me to implement them than to remove the uses.
gdb/ChangeLog
2019-10-01 Pedro Alves <palves@redhat.com>
Tom Tromey <tom@tromey.com>
* unittests/format_pieces-selftests.c: Add gdb_format parameter.
(test_gdb_formats): New function.
(run_tests): Call it.
(test_format_specifier): Update.
* utils.h (fputs_filtered): Update comment.
(vfprintf_styled, vfprintf_styled_no_gdbfmt)
(fputs_styled_unfiltered): Declare.
* utils.c (fputs_styled_unfiltered): New function.
(vfprintf_maybe_filtered): Add gdbfmt parameter.
(vfprintf_filtered): Update.
(vfprintf_unfiltered, vprintf_filtered): Update.
(vfprintf_styled, vfprintf_styled_no_gdbfmt): New functions.
* ui-out.h (enum ui_out_flag) <unfiltered_output,
disallow_ui_out_field>: New constants.
(enum class field_kind): New.
(struct base_field_s, struct signed_field_s): New.
(signed_field): New function.
(struct string_field_s): New.
(string_field): New function.
(struct styled_string_s): New.
(styled_string): New function.
(class ui_out) <message>: Add comment.
<vmessage, call_do_message>: New methods.
<do_message>: Add style parameter.
* ui-out.c (ui_out::call_do_message, ui_out::vmessage): New
methods.
(ui_out::message): Rewrite.
* mi/mi-out.h (class mi_ui_out) <do_message>: Add style
parameter.
* mi/mi-out.c (mi_ui_out::do_message): Add style parameter.
* gdbsupport/format.h (class format_pieces) <format_pieces>: Add
gdb_extensions parameter.
(class format_piece): Add parameter to constructor.
(n_int_args): New field.
* gdbsupport/format.c (format_pieces::format_pieces): Add
gdb_extensions parameter. Handle '*'.
* cli-out.h (class cli_ui_out) <do_message>: Add style parameter.
* cli-out.c (cli_ui_out::do_message): Add style parameter. Call
vfprintf_styled_no_gdbfmt.
(cli_ui_out::do_field_string, cli_ui_out::do_spaces)
(cli_ui_out::do_text, cli_ui_out::field_separator): Allow
unfiltered output.
* ui-style.h (struct ui_file_style) <ptr>: New method.
gdb/testsuite/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* gdb.base/style.exp: Update tests.
Tom Tromey [Sun, 22 Sep 2019 22:06:03 +0000 (16:06 -0600)]
Don't create empty literal pieces
I noticed that format_pieces can create an empty literal piece.
However, there's never a need for one, so this patch removes the
possibility.
gdb/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* unittests/format_pieces-selftests.c: Update. Add final format.
* gdbsupport/format.c (format_pieces::format_pieces): Don't add
empty literal pieces.
Tom Tromey [Wed, 5 Jun 2019 22:21:24 +0000 (16:21 -0600)]
Remove the ui_out_style_kind enum
This removes the ui_out_style_kind enum, in favor of simply using
ui_file_style references. This simplifies the code somewhat.
gdb/ChangeLog
2019-10-01 Tom Tromey <tom@tromey.com>
* ui-out.h (enum class ui_out_style_kind): Remove.
(class ui_out) <field_string, field_stsream, do_field_string>:
Change type of "style".
* ui-out.c (ui_out::field_core_addr, ui_out::field_stream)
(ui_out::field_string): Update.
* tui/tui-out.h (class tui_ui_out) <do_field_string>: Change type
of "style".
* tui/tui-out.c (tui_ui_out::do_field_string): Update.
* tracepoint.c (print_one_static_tracepoint_marker): Update.
* stack.c (print_frame_arg, print_frame_info, print_frame):
Update.
* source.c (print_source_lines_base): Update.
* solib.c (info_sharedlibrary_command): Update.
* skip.c (info_skip_command): Update.
* record-btrace.c (btrace_call_history_src_line)
(btrace_call_history): Update.
* python/py-framefilter.c (py_print_frame): Update.
* mi/mi-out.h (class mi_ui_out) <do_field_string>: Change type of
"style".
* mi/mi-out.c (mi_ui_out::do_table_header)
(mi_ui_out::do_field_signed, mi_ui_out::do_field_unsigned)
(mi_ui_out::do_field_string): Update.
* disasm.c (gdb_pretty_print_disassembler::pretty_print_insn):
Update.
* cli-out.h (class cli_ui_out) <do_field_string>: Change type of
"style".
* cli-out.c (cli_ui_out::do_table_header)
(cli_ui_out::do_field_signed, cli_ui_out::do_field_unsigned)
(cli_ui_out::do_field_skip, cli_ui_out::do_field_string)
(cli_ui_out::do_field_fmt): Update.
* breakpoint.c (print_breakpoint_location): Update.
(update_static_tracepoint): Update.
Andreas Arnez [Tue, 1 Oct 2019 17:20:29 +0000 (19:20 +0200)]
gdb/testsuite: Fix pretty-print.exp on big-endian platforms
The pretty-print test case fails on s390/s390x because it relies on a
little-endian representation of bit fields. Little-endian architectures
typically allocate bit fields from least to most significant bit, but
big-endian architectures typically use the reverse order, allocating the
most significant bit first. Thus the two bit fields in each of the test
case's unions overlap either in their lower or in their higher bits,
depending on the target's endianness:
union {
int three : 3;
int four : 4;
};
Now, when initializing 'three' with 3, 'four' will become 3 on little
endian targets, but 6 on big-endian targets, making it FAIL there.
Fix this by initializing the longer bit field instead and using an
all-ones bit pattern. In this way the result does not depend on
endianness. Use 'unsigned' instead of int for one of the bit fields in
each of the unions, to increase the variety of resulting values.
gdb/testsuite/ChangeLog:
* gdb.base/pretty-print.c (struct s1_t): Change fields 'three' and
'six' to unsigned.
(s1): Initialize fields 'four' and 'six' instead of 'three' and
'five'. Use an all-ones bit pattern for each.
* gdb.base/pretty-print.exp: Adjust expected output of "print s1"
to its changed values.
Philippe Waroquiers [Sun, 29 Sep 2019 16:26:23 +0000 (18:26 +0200)]
Fix leak due to assigning a xstrdup-ed string to the std::string gdb_datadir
Valgrind reports the following leak:
==32623== 56 bytes in 1 blocks are definitely lost in loss record 1,099 of 6,654
==32623== at 0x4835753: malloc (vg_replace_malloc.c:307)
==32623== by 0x25CF67: xmalloc (alloc.c:60)
==32623== by 0x65FBD9: xstrdup (xstrdup.c:34)
==32623== by 0x413D9E: captured_main_1(captured_main_args*) (main.c:553)
==32623== by 0x414FFA: captured_main (main.c:1172)
==32623== by 0x414FFA: gdb_main(captured_main_args*) (main.c:1197)
==32623== by 0x22531A: main (gdb.c:32)
Commit
f2aec7f6d14 changed gdb_datadir to std::string.
So, xstrdup-ing the result of relocate_gdb_directory (returning a std::string)
is not needed and creates a leak.
Fix the leak by removing the xstrdup and the not needed c_str ().
Also removes a useless conversion of gdb_datadir to std::string.
gdb/ChangeLog
2019-10-01 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* main.c (relocate_gdbinit_path_maybe_in_datadir): Remove std::string
conversion of gdb_datadir.
(captured_main_1): Remove xstrdup when assigning to gdb_datadir,
remove not needed c_str ().
Ali Tamur [Tue, 27 Aug 2019 01:40:18 +0000 (18:40 -0700)]
[PATCH v2 2/4] DWARF 5 support: Handle DW_FORM_strx
* Handle DW_FORM_strx forms everywhere.
Tested with CC=/usr/bin/gcc (version 8.3.0) against master branch (also with
-gsplit-dwarf and -gdwarf-4 flags) and there was no increase in the set of
tests that fails.
This is part of an effort to support DWARF 5 in gdb.
gdb/ChangeLog:
* dwarf2read.c (skip_one_die): Handle DW_FORM_strx forms.
(dwarf2_string_attr): Likewise.
GDB Administrator [Tue, 1 Oct 2019 00:00:41 +0000 (00:00 +0000)]
Automatic date update in version.in
Ali Tamur [Mon, 30 Sep 2019 20:34:44 +0000 (13:34 -0700)]
Remove extra whitespaces at the end of lines.
gdb/ChangeLog:
* dwarf2read.c (process_full_comp_unit): Remove whitespace at the EOL.
(process_full_type_unit): Likewise.
(dump_die_shallow): Likewise.
(cu_debug_loc_section): Likewise.
Christian Biesinger [Sun, 29 Sep 2019 00:45:20 +0000 (19:45 -0500)]
Use std::sort instead of qsort in minsyms.c
This has better typesafety and is also marginally faster (either
due to inlining or because it avoids indirection through a
function pointer).
Note that in this change:
- return 1; /* fn1 has no name, so it is "less". */
+ return true; /* fn1 has no name, so it is "less". */
else if (name1) /* fn2 has no name, so it is "less". */
- return -1;
+ return false;
I am fairly sure the old code was wrong (ie. code didn't match the
comment and the comment seemed correct), so I fixed it.
gdb/ChangeLog:
2019-09-28 Christian Biesinger <cbiesinger@google.com>
* minsyms.c (compare_minimal_symbols): Rename to...
(minimal_symbol_is_less_than): ...this, and adjust to STL
conventions (return bool, take arguments as references)
(minimal_symbol_reader::install): Call std::sort instead
of qsort.
Tom Tromey [Mon, 30 Sep 2019 16:33:39 +0000 (10:33 -0600)]
Disable all warnings in gdb.rust/traits.rs
With rustc 1.37, I started seeing compiler warnings from the traits.rs
test case:
warning: trait objects without an explicit `dyn` are deprecated
It seems to me that we generally do not want warnings in these test
cases. At some point, we'll probably have to patch traits.rs to use
the "dyn" keyword; by that time I expect that all the Rust compilers
in common use will support it. In the meantime it seemed simplest to
simply disable all warnings in this file.
gdb/testsuite/ChangeLog
2019-09-30 Tom Tromey <tromey@adacore.com>
* gdb.rust/traits.rs: Disable all warnings.
Christian Biesinger [Mon, 30 Sep 2019 01:15:38 +0000 (20:15 -0500)]
Improve some comments about msymbol handling
This just clarifies some comments about the hashtables involved
in msymbols.
gdb/ChangeLog:
2019-09-29 Christian Biesinger <cbiesinger@google.com>
* minsyms.h (msymbol_hash): Document that this is a case-insensitive
hash and why.
* objfiles.h (struct objfile_per_bfd_storage) <demangled_names_hash,
msymbol_hash, msymbol_demangled_hash>: Improve comments.
Simon Marchi [Mon, 30 Sep 2019 15:49:25 +0000 (11:49 -0400)]
gdb: re-write add_psymbol_to_list doc, move it to header file
The comment above the add_psymbol_to_list function seems outdated and
misleading, here's an attempt at improving it.
gdb/ChangeLog:
* psymtab.c (add_psymbol_to_list): Move comment to psympriv.h.
* psympriv.h (add_psymbol_to_list): Move comment here and update
it.
Alan Modra [Mon, 30 Sep 2019 04:34:08 +0000 (14:04 +0930)]
PR25046, readelf "Reading xxx bytes extends past end of file for dynamic section"
PR 25046
* readelf.c (process_program_headers): Clear dynamic_addr and
dynamic_size earlier.
GDB Administrator [Mon, 30 Sep 2019 00:00:33 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom de Vries [Sun, 29 Sep 2019 21:58:21 +0000 (23:58 +0200)]
[gdb/contrib] cc-with-tweaks.sh: Create .dwz file in .tmp subdir
When running a test-case gdb.base/foo.exp with cc-with-dwz-m, a file
build/gdb/testsuite/outputs/gdb.base/foo/foo.dwz will be created, alongside
executable build/gdb/testsuite/outputs/gdb.base/foo/foo.
This can cause problems in f.i. test-cases that test file name completion.
Make these problems less likely by moving foo.dwz to a .tmp subdir:
build/gdb/testsuite/outputs/gdb.base/foo/.tmp/foo.dwz.
Tested on x86_64-linux.
gdb/ChangeLog:
2019-09-29 Tom de Vries <tdevries@suse.de>
* contrib/cc-with-tweaks.sh (get_tmpdir): New function.
Use $tmpdir/$(basename "$output_file").dwz instead of
"${output_file}.dwz".
gdb/testsuite/ChangeLog:
2019-09-29 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/gdb-index.exp: Handle new location of .dwz file.
Tom de Vries [Sun, 29 Sep 2019 21:51:50 +0000 (23:51 +0200)]
[gdb/testsuite] Make pass message unique in gdb-index.exp for cc-with-dwz-m
With cc-with-dwz-m, we get:
...
PASS: gdb.dwarf2/gdb-index.exp: objcopy
PASS: gdb.dwarf2/gdb-index.exp: objcopy
...
Make the pass message unique by using with_test_prefix:
...
PASS: gdb.dwarf2/gdb-index.exp: objcopy
PASS: gdb.dwarf2/gdb-index.exp: modify dwz file: objcopy
...
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2019-09-29 Tom de Vries <tdevries@suse.de>
* gdb.dwarf2/gdb-index.exp: Use with_test_prefix for second objcopy.
GDB Administrator [Sun, 29 Sep 2019 00:00:40 +0000 (00:00 +0000)]
Automatic date update in version.in
Simon Marchi [Sat, 28 Sep 2019 18:48:22 +0000 (14:48 -0400)]
gdb: include gdbarch.h in hppa-linux-nat.c
hppa-linux-nat.c fails to build due to the gdbarch stuff not being
declared, for example:
hppa-linux-nat.c: In function ‘void fetch_register(regcache*, int)’:
hppa-linux-nat.c:230:7: error: ‘gdbarch_cannot_fetch_register’ was not declared in this scope
if (gdbarch_cannot_fetch_register (gdbarch, regno))
Include gdbarch.h to fix it.
gdb/ChangeLog:
PR gdb/25045
* hppa-linux-nat.c: Include gdbarch.h.
Alan Modra [Wed, 11 Sep 2019 03:52:42 +0000 (13:22 +0930)]
PR16794, gold ignores R_386_GOTOFF addend
An R_386_GOTOFF relocation has an addend, typically used when a
symbol can be replaced by its section symbol plus an offset.
psymval->value(object,0) is quite wrong then, fix it.
PR 16794
* i386.cc (Target_i386::Relocate::relocate <R_386_GOTOFF>): Don't
ignore addend, apply using pcrel32.
* x86_64.cc (Target_x86_64::Relocate::relocate <R_X86_64_GOTOFF64>):
Similarly use pcrel64.
GDB Administrator [Sat, 28 Sep 2019 00:00:25 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom de Vries [Fri, 27 Sep 2019 15:04:59 +0000 (17:04 +0200)]
[gdb/testsuite] Fix incomplete regexps in step-precsave.exp
The commit
68f7d34dd50 "[gdb/testsuite] Add KFAIL for missing support of
reverse-debugging of vmovd" rewrites a gdb_test into a gdb_test_multiple but
forgets to add the $gdb_prompt part in the regexp.
Add the missing parts of the regexps.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2019-09-27 Tom de Vries <tdevries@suse.de>
* gdb.reverse/step-precsave.exp: Add missing $gdb_prompt in regexps.
Tom de Vries [Fri, 27 Sep 2019 08:36:18 +0000 (10:36 +0200)]
[gdb/testsuite] Add KFAIL for missing support of reverse-debugging of vmovd
On my openSUSE Leap 15.1 system I run into:
...
(gdb) PASS: gdb.reverse/step-precsave.exp: turn on process record
break 76^M
Breakpoint 2 at 0x400654: file step-reverse.c, line 76.^M
(gdb) PASS: gdb.reverse/step-precsave.exp: breakpoint at end of main
continue^M
Continuing.^M
Process record does not support instruction 0xc5 at address 0x7ffff783fc70.^M
Process record: failed to record execution log.^M
^M
Program stopped.^M
0x00007ffff783fc70 in __memset_avx2_unaligned_erms () from /lib64/libc.so.6^M
(gdb) FAIL: gdb.reverse/step-precsave.exp: run to end of main
...
The problem is that the vmovd instruction is not supported in
reverse-debugging (PR record/23188).
Add a KFAIL for this PR.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2019-09-27 Tom de Vries <tdevries@suse.de>
PR record/23188
* gdb.reverse/step-precsave.exp: Add kfail for PR record/23188.
GDB Administrator [Fri, 27 Sep 2019 00:00:37 +0000 (00:00 +0000)]
Automatic date update in version.in
Sergio Durigan Junior [Thu, 26 Sep 2019 18:24:30 +0000 (14:24 -0400)]
Revert "Improve ptrace-error detection on Linux targets"
This reverts commit
381beca6146ac68b57edf47d28cdb335fbd11635.
The patch hasn't been fully reviewed yet, and Pedro would like to see
more fixes.
Sergio Durigan Junior [Fri, 16 Aug 2019 23:36:37 +0000 (19:36 -0400)]
Improve ptrace-error detection on Linux targets
In Fedora GDB, we carry the following patch:
https://src.fedoraproject.org/rpms/gdb/blob/
8ac06474ff1e2aa4920d14e0666b083eeaca8952/f/gdb-attach-fail-reasons-5of5.patch
Its purpose is to try to detect a specific scenario where SELinux's
'deny_ptrace' option is enabled, which prevents GDB from ptrace'ing in
order to debug the inferior (PTRACE_ATTACH and PTRACE_TRACEME will
fail with EACCES in this case).
I like the idea of improving error detection and providing more
information to the user (a simple "Permission denied" can be really
frustrating), but I don't fully agree with the way the patch was
implemented: it makes GDB link against libselinux only for the sake of
consulting the 'deny_ptrace' setting, and then prints a warning if
ptrace failed and this setting is on.
My first thought (and attempt) was to make GDB print a generic warning
when a ptrace error happened; this message would just point the user
to our documentation, where she could find more information about
possible causes for the error (and try to diagnose/fix the problem).
This proved to be too simple, and I was convinced that it is actually
a good idea to go the extra kilometre and try to pinpoint the specific
problem (or problems) preventing ptrace from working, as well as
provide useful suggestions on how the user can fix things.
Here is the patch I came up with. It implements a new function,
'linux_ptrace_restricted_fail_reason', which does a few things to
check what's wrong with ptrace:
- It dlopen's "libselinux.so.1" and checks if the "deny_ptrace"
option is enabled.
- It reads the contents of "/proc/sys/kernel/yama/ptrace_scope" and
checks if it's different than 0.
For each of these checks, if it succeeds, the user will see a message
informing about the restriction in place, and how it can be disabled.
For example, if "deny_ptrace" is enabled, the user will see:
# gdb /usr/bin/true
...
Starting program: /usr/bin/true
warning: Could not trace the inferior process.
warning: ptrace: Permission denied
The SELinux 'deny_ptrace' option is enabled and preventing GDB
from using 'ptrace'. You can disable it by executing (as root):
setsebool deny_ptrace off
If you are debugging the inferior remotely, the ptrace restriction(s) need
to be disabled in the target system (e.g., where GDBserver is running).
During startup program exited with code 127.
(gdb)
In case "/proc/sys/kernel/yama/ptrace_scope" is > 0:
# gdb /usr/bin/true
...
Starting program: /usr/bin/true
warning: Could not trace the inferior process.
warning: ptrace: Operation not permitted
The Linux kernel's Yama ptrace scope is in effect, which can prevent
GDB from using 'ptrace'. You can disable it by executing (as root):
echo 0 > /proc/sys/kernel/yama/ptrace_scope
If you are debugging the inferior remotely, the ptrace restriction(s) need
to be disabled in the target system (e.g., where GDBserver is running).
During startup program exited with code 127.
(gdb)
If both restrictions are enabled, both messages will show up.
This works for gdbserver as well, and actually fixes a latent bug I
found: when ptrace is restricted, gdbserver would hang due to an
unchecked ptrace call:
# gdbserver :9988 /usr/bin/true
gdbserver: linux_ptrace_test_ret_to_nx: Cannot PTRACE_TRACEME: Operation not permitted
gdbserver: linux_ptrace_test_ret_to_nx: status 256 is not WIFSTOPPED!
gdbserver: linux_ptrace_test_ret_to_nx: failed to kill child pid
2668100 No such process
[ Here you would have to issue a C-c ]
Now, you will see:
# gdbserver :9988 /usr/bin/true
gdbserver: linux_ptrace_test_ret_to_nx: Cannot PTRACE_TRACEME: Permission denied
gdbserver: linux_ptrace_test_ret_to_nx: status 256 is not WIFSTOPPED!
gdbserver: linux_ptrace_test_ret_to_nx: failed to kill child pid
2766868 No such process
gdbserver: Could not trace the inferior process.
gdbserver: ptrace: Permission denied
The SELinux 'deny_ptrace' option is enabled and preventing GDB
from using 'ptrace'. You can disable it by executing (as root):
setsebool deny_ptrace off
If you are debugging the inferior remotely, the ptrace restriction(s) need
to be disabled in the target system (e.g., where GDBserver is running).
#
(I decided to keep all the other messages, even though I find them a
bit distracting).
If GDB can't determine the cause for the failure, it will still print
the generic error message which tells the user to check our
documentation:
There might be restrictions preventing ptrace from working. Please see
the appendix "Linux kernel ptrace restrictions" in the GDB documentation
for more details.
If you are debugging the inferior remotely, the ptrace restriction(s) need
to be disabled in the target system (e.g., where GDBserver is running).
This means that the patch expands our documentation and creates a new
appendix section named "Linux kernel ptrace restrictions", with
sub-sections for each possible restriction that might be in place.
Notice how, on every message, we instruct the user to "do the right
thing" if gdbserver is being used. This is because if the user
started gdbserver *before* any ptrace restriction was in place, and
then, for some reason, one or more restrictions get enabled, then the
error message will be displayed both on gdbserver *and* on the
connected GDB. Since the user will be piloting GDB, it's important to
explicitly say that the ptrace restrictions are enabled in the target,
where gdbserver is running.
The current list of possible restrictions is:
- SELinux's 'deny_ptrace' option (detected).
- YAMA's /proc/sys/kernel/yama/ptrace_scope setting (detected).
- seccomp on Docker containers (I couldn't find how to detect).
It's important to mention that all of this is Linux-specific; as far
as I know, SELinux, YAMA and seccomp are Linux-only features.
I tested this patch locally, on my Fedora 30 machine (actually, a
Fedora Rawhide VM), but I'm not proposing a testcase for it because of
the difficulty of writing one.
WDYT?
gdb/doc/ChangeLog:
2019-09-26 Sergio Durigan Junior <sergiodj@redhat.com>
* gdb.texinfo (Linux kernel ptrace restrictions): New appendix
section.
gdb/ChangeLog:
2019-09-26 Sergio Durigan Junior <sergiodj@redhat.com>
Jan Kratochvil <jan.kratochvil@redhat.com>
Pedro Alves <palves@redhat.com>
* gdbsupport/gdb-dlfcn.h (gdb_dlopen): Update comment and
mention that the function throws an error.
* inf-ptrace.c (default_inf_ptrace_me_fail_reason): New
function.
(inf_ptrace_me_fail_reason): New variable.
(inf_ptrace_me): Update call to 'trace_start_error_with_name'.
* inf-ptrace.h (inf_ptrace_me_fail_reason): New variable.
* linux-nat.c (attach_proc_task_lwp_callback): Call
'linux_ptrace_attach_fail_reason_lwp'.
(linux_nat_target::attach): Update call to
'linux_ptrace_attach_fail_reason'.
(_initialize_linux_nat): Set 'inf_ptrace_me_fail_reason'.
* nat/fork-inferior.c (trace_start_error_with_name): Add
optional 'append' argument.
* nat/fork-inferior.h (trace_start_error_with_name): Update
prototype.
* nat/linux-ptrace.c: Include "gdbsupport/gdb-dlfcn.h",
"gdbsupport/filestuff.h" and "nat/fork-inferior.h".
(selinux_ftype): New typedef.
(linux_ptrace_restricted_fail_reason): New function.
(linux_ptrace_attach_fail_reason_1): New function.
(linux_ptrace_attach_fail_reason): Change first argument type
from 'ptid_t' to 'pid_t'. Call
'linux_ptrace_attach_fail_reason_1' and
'linux_ptrace_restricted_fail_reason'.
(linux_ptrace_attach_fail_reason_lwp): New function.
(linux_ptrace_me_fail_reason): New function.
(errno_pipe): New variable.
(linux_fork_to_function): Initialize pipe before forking.
(linux_child_function): Deal with errno-passing from child.
Handle ptrace error.
(linux_check_child_ptrace_errno): New function.
(linux_check_child_ptrace_errno): Call
'linux_check_child_ptrace_errno'.
* nat/linux-ptrace.h (linux_ptrace_attach_fail_reason): Update
prototype.
(linux_ptrace_attach_fail_reason_lwp): New prototype.
(linux_ptrace_me_fail_reason): New prototype.
* remote.c (extended_remote_target::attach): Handle error
message passed by the server when attach fails.
gdb/gdbserver/ChangeLog:
2019-09-26 Sergio Durigan Junior <sergiodj@redhat.com>
Pedro Alves <palves@redhat.com>
* linux-low.c (linux_ptrace_fun): Call
'linux_ptrace_me_fail_reason'.
(attach_proc_task_lwp_callback): Call
'linux_ptrace_attach_fail_reason_lwp'.
(linux_attach): Call 'linux_ptrace_attach_fail_reason'.
* server.c (handle_v_attach): Use try..catch when calling
'attach_inferior', and send an error message to the client
when needed.
* thread-db.c (attach_thread): Call
'linux_ptrace_attach_fail_reason_lwp'.
Christian Biesinger [Tue, 24 Sep 2019 21:43:18 +0000 (16:43 -0500)]
Convert symtab.h function signatures to use bool instead of int
gdb/ChangeLog:
2019-09-26 Christian Biesinger <cbiesinger@google.com>
* blockframe.c (find_pc_partial_function): Change return type to bool.
* elfread.c (elf_gnu_ifunc_resolve_name): Likewise.
* minsyms.c (in_gnu_ifunc_stub): Likewise.
(stub_gnu_ifunc_resolve_name): Likewise.
* symtab.c (compare_filenames_for_search): Likewise.
(compare_glob_filenames_for_search): Likewise.
(matching_obj_sections): Likewise.
(symbol_matches_domain): Likewise.
(find_line_symtab): Change out param EXACT_MATCH to bool *.
(find_line_pc): Change return type to bool.
(find_line_pc_range): Likewise.
(producer_is_realview): Likewise.
* symtab.h (symbol_matches_domain): Likewise.
(find_pc_partial_function): Likewise.
(find_pc_line_pc_range): Likewise.
(in_gnu_ifunc_stub): Likewise.
(struct gnu_ifunc_fns) <gnu_ifunc_resolve_name>: Likewise.
(find_line_pc): Likewise.
(find_line_pc_range): Likewise.
(matching_obj_sections): Likewise.
(find_line_symtab): Change out parameter to bool.
(producer_is_realview): Change return type to bool.
(compare_filenames_for_search): Likewise.
(compare_glob_filenames_for_search): Likewise.
Tom Tromey [Sun, 17 Feb 2019 18:23:20 +0000 (11:23 -0700)]
Remove gdb_usleep.c
I noticed that gdb_usleep is unused, so this patch removes it.
gdb/ChangeLog
2019-09-26 Tom Tromey <tom@tromey.com>
* Makefile.in (COMMON_SFILES): Remove gdb_usleep.c.
(HFILES_NO_SRCDIR): Remove gdb_usleep.h.
* gdb_usleep.h: Remove.
* gdb_usleep.c: Remove.
* utils.c: Don't include gdb_usleep.h.
Tom Tromey [Mon, 19 Aug 2019 19:41:34 +0000 (13:41 -0600)]
Do not expose stub types to Python
dwarf2read.c will create stub types for Ada "Taft Amendment" types.
These stub types can currently be exposed to Python code, where they
show up as TYPE_CODE_VOID types (but that, mysteriously, can sometimes
be used in other ways).
While it's possible to work with such types by using strip_typedefs,
this seemed unpleasant to me. This patch takes another approach
instead, which is to try not to expose stub types to Python users.
gdb/ChangeLog
2019-09-26 Tom Tromey <tromey@adacore.com>
* python/py-type.c (type_to_type_object): Call check_typedef
for stub types.
gdb/testsuite/ChangeLog
2019-09-26 Tom Tromey <tromey@adacore.com>
* gdb.ada/py_taft.exp: New file.
* gdb.ada/py_taft/main.adb: New file.
* gdb.ada/py_taft/pkg.adb: New file.
* gdb.ada/py_taft/pkg.ads: New file.
Tom Tromey [Tue, 24 Sep 2019 23:52:08 +0000 (17:52 -0600)]
Remove initialize_utils
initialize_utils only registers some commands, so it isn't necessary
to run it at any particular time during startup. This patch removes
it and merges its contents into _initialize_utils.
Tested by the buildbot.
gdb/ChangeLog
2019-09-26 Tom Tromey <tom@tromey.com>
* utils.h (initialize_utils): Don't declare.
* top.c (gdb_init): Don't call initialize_utils.
* utils.c (initialize_utils): Remove. Move contents...
(_initialize_utils): ... here.
Alan Modra [Thu, 26 Sep 2019 06:50:35 +0000 (16:20 +0930)]
PR24262, plugin search dir doesn't respect --libdir
bfd/
PR 24262
* Makefile.am (AM_CPPFLAGS): Add -DLIBDIR.
* plugin.c (load_plugin): Search both ${libdir}/bfd-plugins and
${bindir}/../lib/bfd-plugins if different.
* Makefile.in: Regenerate.
ld/
PR 24262
* ld.texi (-plugin): Revert 2019-03-15 change.
GDB Administrator [Thu, 26 Sep 2019 00:00:45 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom Tromey [Tue, 24 Sep 2019 23:36:07 +0000 (17:36 -0600)]
Remove make_hex_string
I noticed that make_hex_string does essentially the same thing as
bin2hex, and furthermore is only called in a single spot. This patch
removes make_hex_string.
Tested by the builtbot.
gdb/ChangeLog
2019-09-25 Tom Tromey <tom@tromey.com>
* python/py-objfile.c (objfpy_get_build_id): Use bin2hex.
* utils.h (make_hex_string): Don't declare.
* utils.c (make_hex_string): Remove.
Alan Modra [Wed, 25 Sep 2019 06:00:53 +0000 (15:30 +0930)]
SORT_BY_INIT_PRIORITY
I was looking at the implementation of this script keyword today and
couldn't remember why we do what we do in get_init_priority, because
the comments explain how the init_priority is encoded but don't say
why it is necessary to extract the priority and sort on that. So
after figuring out why (again), I wrote some more comments.
Then I simplified get_init_priority a little, adding some sanity
checking on the strtoul result. This actually makes get_init_priority
support sorting by numerical suffix more generally, but I figure this
feature would be better as a new keyword (without the .ctors/.dtors
special case), so haven't documented the extension.
* ld.texi (SORT_BY_ALIGNMENT): Reword slightly.
(SORT_BY_INIT_PRIORITY): Elucidate.
* ldlang.c: Include limits.h.
(get_init_priority): Comment. Change param to a section,
return an int. Sanity check priority digits. Support sorting
more sections with trailing digits. Return -1 on error.
(compare_section): Adjust.
Nick Clifton [Wed, 25 Sep 2019 13:34:23 +0000 (14:34 +0100)]
Silence a build-time warning about constant comparisons when building with clang,
* emultempl/avrelf.em (_before_allocation): Silence build warning
using clang.
GDB Administrator [Wed, 25 Sep 2019 00:00:43 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom de Vries [Tue, 24 Sep 2019 21:38:49 +0000 (23:38 +0200)]
[gdb/tdep] Handle mxcsr kernel bug on Intel Skylake CPUs
On my openSUSE Leap 15.1 x86_64 Skylake system with the default (4.12) kernel,
I run into:
...
FAIL: gdb.base/gcore.exp: corefile restored all registers
...
The problem is that there's a difference in the mxcsr register value before
and after the gcore command:
...
- mxcsr 0x0 [ ]
+ mxcsr 0x400440 [ DAZ OM ]
...
This can be traced back to amd64_linux_nat_target::fetch_registers, where
xstateregs is partially initialized by the ptrace call:
...
char xstateregs[X86_XSTATE_MAX_SIZE];
struct iovec iov;
amd64_collect_xsave (regcache, -1, xstateregs, 0);
iov.iov_base = xstateregs;
iov.iov_len = sizeof (xstateregs);
if (ptrace (PTRACE_GETREGSET, tid,
(unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
perror_with_name (_("Couldn't get extended state status"));
amd64_supply_xsave (regcache, -1, xstateregs);
...
after which amd64_supply_xsave is called.
The amd64_supply_xsave call is supposed to only use initialized parts of
xstateregs, but due to a kernel bug on intel skylake (fixed from 4.14 onwards
by commit
0852b374173b "x86/fpu: Add FPU state copying quirk to handle XRSTOR
failure on Intel Skylake CPUs") it can happen that the mxcsr part of
xstateregs is not initialized, while amd64_supply_xsave expects it to be
initialized, which explains the FAIL mentioned above.
Fix the undetermined behaviour by initializing xstateregs before calling
ptrace, which makes sure we get a 0x0 for mxcsr when this kernel bug occurs,
and which also happens to fix the FAIL.
Furthermore, add an xfail for this FAIL which triggers the same kernel bug:
...
FAIL: gdb.arch/amd64-init-x87-values.exp: check_setting_mxcsr_before_enable: \
check new value of MXCSR is still in place
...
Both FAILs pass when using a 5.3 kernel instead on the system mentioned above.
Tested on x86_64-linux.
gdb/ChangeLog:
2019-09-24 Tom de Vries <tdevries@suse.de>
PR gdb/23815
* amd64-linux-nat.c (amd64_linux_nat_target::fetch_registers):
Initialize xstateregs before ptrace PTRACE_GETREGSET call.
gdb/testsuite/ChangeLog:
2019-09-24 Tom de Vries <tdevries@suse.de>
PR gdb/24598
* gdb.arch/amd64-init-x87-values.exp: Add xfail.
Tamar Christina [Tue, 24 Sep 2019 13:46:17 +0000 (14:46 +0100)]
Arm: Fix out of range conditional branch (PR/24991)
The fix for PR12848 introduced an off by one error in the mask, this corrected
the negative overflows but not the positive overflows. As a result the
conditional branch instructions accepted a too wide positive immediate which
resulted in it corrupting the instruction during encoding.
The relocation I believe has been incorrectly named, to be consistent with the
other relocations it should have been named BRANCH21 which is why the masks for
it are confusing.
I've replaced the masks with a function out_of_range_p which should make it
harder to make such mistakes.
The mask for BL/BLX on Armv6t+ is also wrong, the extended range is 25-bits
and so the mask should be checking for 24-bits for positive overflow.
gas/ChangeLog:
PR gas/24991
* config/tc-arm.c (out_of_range_p): New.
(md_apply_fix): Use it in BFD_RELOC_THUMB_PCREL_BRANCH9,
BFD_RELOC_THUMB_PCREL_BRANCH12, BFD_RELOC_THUMB_PCREL_BRANCH20,
BFD_RELOC_THUMB_PCREL_BRANCH23, BFD_RELOC_THUMB_PCREL_BRANCH25
* testsuite/gas/arm/pr24991.d: New test.
* testsuite/gas/arm/pr24991.l: New test.
* testsuite/gas/arm/pr24991.s: New test.
Alan Modra [Tue, 24 Sep 2019 13:17:13 +0000 (22:47 +0930)]
PR25031, nm reports wrong address on 32bit
Using saved_format breaks when nm is presented with multiple object
files, some 32-bit and some 64-bit.
PR 25031
* nm.c (print_format_string): New.
(get_print_format): Delete saved_format. Move earlier.
(set_print_width): Call get_print_format.
(print_value): Use print_format_string.
Srinath Parvathaneni [Tue, 24 Sep 2019 09:18:12 +0000 (10:18 +0100)]
[ARM]: Modify assembler to accept floating and signless datatypes for MVE instruction VLDR.
This patch modifies assembler to accept the equivalent sized floating
and signless datatypes for VLDR instruction but as alias for the unsigned version.
gas/ChangeLog:
2019-09-23 Srinath Parvathaneni <srinath.parvathaneni@arm.com>
* config/tc-arm.c (do_mve_vstr_vldr_RQ): Modify function to allow float
* and signless datatypes for few cases of VLDR instruction.
* testsuite/gas/arm/mve-vldr-bad-3.l: Modify.
* testsuite/gas/arm/mve-vldr-bad-3.s: Likewise.
* testsuite/gas/arm/mve-vstrldr-1.d: Likewise.
* testsuite/gas/arm/mve-vstrldr-1.s: Likewise.
Nick Clifton [Tue, 24 Sep 2019 09:07:56 +0000 (10:07 +0100)]
Fix building gold with gcc-10.
* descriptors.cc: Include <string>
GDB Administrator [Tue, 24 Sep 2019 00:00:31 +0000 (00:00 +0000)]
Automatic date update in version.in
Andrew Burgess [Mon, 23 Sep 2019 21:36:42 +0000 (22:36 +0100)]
gdb/readline: Fix date in last ChangeLog entry
Fixes the date in the last ChangeLog entry.
Andrew Burgess [Wed, 18 Sep 2019 19:13:25 +0000 (15:13 -0400)]
gdb/readline: fix use of an undefined variable
This commit in binutils-gdb:
commit
830b67068cebe7db0eb0db3fa19244e03859fae0
Date: Fri Jul 12 09:53:02 2019 +0200
[readline] Fix heap-buffer-overflow in update_line
Which corresponds to this commit in upstream readline:
commit
31547b4ea4a1a904e1b08e2bc4b4ebd5042aedaa
Date: Mon Aug 5 10:24:27 2019 -0400
commit readline-
20190805 snapshot
Introduced a use of an undefined variable, which can be seen using
valgrind:
$ valgrind --tool=memcheck gdb
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20190918-git
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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==24924== Conditional jump or move depends on uninitialised value(s)
==24924== at 0x9986C3: rl_redisplay (display.c:710)
==24924== by 0x9839CE: readline_internal_setup (readline.c:447)
==24924== by 0x9A1C2B: _rl_callback_newline (callback.c:100)
==24924== by 0x9A1C85: rl_callback_handler_install (callback.c:111)
==24924== by 0x6195EB: gdb_rl_callback_handler_install(char const*) (event-top.c:319)
==24924== by 0x61975E: display_gdb_prompt(char const*) (event-top.c:409)
==24924== by 0x4FBFE3: cli_interp_base::pre_command_loop() (cli-interp.c:286)
==24924== by 0x6E53DA: interp_pre_command_loop(interp*) (interps.c:321)
==24924== by 0x731F30: captured_command_loop() (main.c:334)
==24924== by 0x733568: captured_main(void*) (main.c:1182)
==24924== by 0x7335CE: gdb_main(captured_main_args*) (main.c:1197)
==24924== by 0x41325D: main (gdb.c:32)
==24924==
(gdb)
The problem can be traced back to init_line_structures. The very
first time this function is ever called its MINSIZE parameter is
always 0 and the global LINE_SIZE is 1024. Prior to the above
mentioned commits we spot that the line_state variables have not yet
been initialised, and allocate them some new buffer, then we enter
this loop:
for (n = minsize; n < line_size; n++)
{
visible_line[n] = 0;
invisible_line[n] = 1;
}
which would initialise everything from the incoming minimum up to the
potentially extended upper line size.
The problem is that the above patches added a new condition that would
bump up the minsize like this:
if (minsize <= _rl_screenwidth) /* XXX - for gdb */
minsize = _rl_screenwidth + 1;
So, the first time this function is called the incoming MINSIZE is 0,
the LINE_SIZE global is 1024, and if the _rl_screenwidth is 80, we see
that MINSIZE will be pushed up to 80. We still notice that the line
state is uninitialised and allocate some buffers, then we enter the
initialisation loop:
for (n = minsize; n < line_size; n++)
{
visible_line[n] = 0;
invisible_line[n] = 1;
}
And initialise from 80 to 1023 i the newly allocated buffers, leaving
0 to 79 uninitialised.
To confirm this is an issue, if we then look at rl_redisplay we see
that a call to init_line_structures is followed first by a call to
rl_on_new_line, which does initialise visible_line[0], but not
invisible_line[0]. Later in rl_redisplay we have this logic:
if (visible_line[0] != invisible_line[0])
rl_display_fixed = 0;
The use of invisible_line[0] here will be undefined.
Considering how this variable was originally initialised before the
above patches, this patch modifies the initialisation loop in
init_line_structures, to use the original value of MINSIZE. With this
change the valgrind warning goes away.
readline/ChangeLog:
PR cli/24980
* display.c (init_line_structures): Initialise line_state using
original minsize value.
Dimitar Dimitrov [Mon, 23 Sep 2019 16:55:43 +0000 (17:55 +0100)]
Add testsuite for the PRU simulator port
sim/testsuite/ChangeLog:
* configure: Regenerate.
sim/testsuite/sim/pru/ChangeLog:
* add.s: New test.
* allinsn.exp: New file.
* dmem-zero-pass.s: New test.
* dmem-zero-trap.s: New test.
* dram.s: New test.
* jmp.s: New test.
* loop-imm.s: New test.
* loop-reg.s: New test.
* mul.s: New test.
* subreg.s: New test.
* testutils.inc: New file.
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