Tom Tromey [Wed, 19 Apr 2023 19:36:56 +0000 (13:36 -0600)]
Move unrelocated_addr to common-types.h
unrelocated_addr is currently defined in symtab.h, but in order to
avoid having to include that in more places, I wanted to move the type
elsewhere. I considered defs.h, but it seemed reasonable to have it
next to CORE_ADDR, which is what this patch does.
Tom Tromey [Wed, 19 Apr 2023 19:21:51 +0000 (13:21 -0600)]
Remove baseaddr parameter from dwarf2_record_block_ranges
dwarf2_record_block_ranges is only ever called with the text section
offset, so this patch removes the parameter entirely. This makes a
subsequent patch a little simpler.
Andrew Burgess [Tue, 13 Jul 2021 18:44:27 +0000 (14:44 -0400)]
gdb: building inferior strings from within GDB
History Of This Patch
=====================
This commit aims to address PR gdb/21699. There have now been a
couple of attempts to fix this issue. Simon originally posted two
patches back in 2021:
The approach taken in my first patch was pretty similar to what Simon
originally posted back in 2021. My second attempt was only a slight
variation on the first.
Pedro then pointed out his older patch, and so we arrive at this
patch. The GDB changes here are mostly Pedro's work, but updated by
me (Andrew), any mistakes are mine.
The tests here are a combinations of everyone's work, and the commit
message is new, but copies bits from everyone's earlier work.
Problem Description
===================
Bug PR gdb/21699 makes the observation that using $_as_string with
GDB's printf can cause GDB to print unexpected data from the
inferior. The reproducer is pretty simple:
#include <stddef.h>
static char arena[100];
/* Override malloc() so value_coerce_to_target() gets a known
pointer, and we know we"ll see an error if $_as_string() gives
a string that isn't null terminated. */
void
*malloc (size_t size)
{
memset (arena, 'x', sizeof (arena));
if (size > sizeof (arena))
return NULL;
return arena;
}
int
main ()
{
return 0;
}
And then in a GDB session:
$ gdb -q test
Reading symbols from /tmp/test...
(gdb) start
Temporary breakpoint 1 at 0x4004c8: file test.c, line 17.
Starting program: /tmp/test
Temporary breakpoint 1, main () at test.c:17
17 return 0;
(gdb) printf "%s\n", $_as_string("hello")
"hello"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
(gdb) quit
The problem above is caused by how value_cstring is used within
py-value.c, but once we understand the issue then it turns out that
value_cstring is used in an unexpected way in many places within GDB.
Within py-value.c we have a null-terminated C-style string. We then
pass a pointer to this string, along with the length of this
string (so not including the null-character) to value_cstring.
In value_cstring GDB allocates an array value of the given character
type, and copies in requested number of characters. However
value_cstring does not add a null-character of its own. This means
that the value created by calling value_cstring is only
null-terminated if the null-character is included in the passed in
length. In py-value.c this is not the case, and indeed, in most uses
of value_cstring, this is not the case.
When GDB tries to print one of these strings the value contents are
pushed to the inferior, and then read back as a C-style string, that
is, GDB reads inferior memory until it finds a null-terminator. For
the py-value.c case, no null-terminator is pushed into the inferior,
so GDB will continue reading inferior memory until a null-terminator
is found, with unpredictable results.
Patch Description
=================
The first thing this patch does is better define what the arguments
for the two function value_cstring and value_string should represent.
The comments in the header file are updated to describe whether the
length argument should, or should not, include a null-character.
Also, the data argument is changed to type gdb_byte. The functions as
they currently exist will handle wide-characters, in which case more
than one 'char' would be needed for each character. As such using
gdb_byte seems to make more sense.
To avoid adding casts throughout GDB, I've also added an overload that
still takes a 'char *', but asserts that the character type being used
is of size '1'.
The value_cstring function is now responsible for adding a null
character at the end of the string value it creates.
However, once we start looking at how value_cstring is used, we
realise there's another, related, problem. Not every language's
strings are null terminated. Fortran and Ada strings, for example,
are just an array of characters, GDB already has the function
value_string which can be used to create such values.
Consider this example using current GDB:
(gdb) set language ada
(gdb) p $_gdb_setting("arch")
$1 = (97, 117, 116, 111)
(gdb) ptype $
type = array (1 .. 4) of char
(gdb) p $_gdb_maint_setting("test-settings string")
$2 = (0)
(gdb) ptype $
type = array (1 .. 1) of char
This shows two problems, first, the $_gdb_setting and
$_gdb_maint_setting functions are calling value_cstring using the
builtin_char character, rather than a language appropriate type. In
the first call, the 'arch' case, the value_cstring call doesn't
include the null character, so the returned array only contains the
expected characters. But, in the $_gdb_maint_setting example we do
end up including the null-character, even though this is not expected
for Ada strings.
This commit adds a new language method language_defn::value_string,
this function takes a pointer and length and creates a language
appropriate value that represents the string. For C, C++, etc this
will be a null-terminated string (by calling value_cstring), and for
Fortran and Ada this can be a bounded array of characters with no null
terminator. Additionally, this new language_defn::value_string
function is responsible for selecting a language appropriate character
type.
After this commit the only calls to value_cstring are from the C
expression evaluator and from the default language_defn::value_string.
And the only calls to value_string are from Fortan, Ada, and ObjectC
related code.
Co-Authored-By: Simon Marchi <simon.marchi@efficios.com> Co-Authored-By: Andrew Burgess <aburgess@redhat.com> Co-Authored-By: Pedro Alves <pedro@palves.net> Approved-By: Simon Marchi <simon.marchi@efficios.com>
Tom de Vries [Mon, 5 Jun 2023 10:53:15 +0000 (12:53 +0200)]
[gdb] Fix grammar in comments and docs
Fix grammar in some comments and docs:
- machines that doesn't -> machines that don't
- its a -> it's a
- its the -> it's the
- if does its not -> if it does it's not
- one more instructions if doesn't match ->
one more instruction if it doesn't match
- it's own -> its own
- it's first -> its first
- it's pointer -> its pointer
I also came across "it's performance" in gdb/stubs/*-stub.c in the HP public
domain notice, I've left that alone.
Alan Modra [Mon, 5 Jun 2023 06:55:16 +0000 (16:25 +0930)]
bfd_error_on_input messages
bfd_errmsg uses asprintf for bfd_error_on_input, which means we
currently leak memory. Keep a static pointer to the message and free
it in various places to minimise the leaks.
bfd_set_input_error (NULL, bfd_error_no_error) is a way to free up the
last string if that matters.
* bfd.c (input_error_msg): New static var.
(bfd_set_input_error): Free it here..
(bfd_init): ..and here..
(bfd_errmsg): ..and here. Use it for asprintf output.
YunQiang Su [Wed, 26 Apr 2023 10:16:40 +0000 (18:16 +0800)]
MIPS: sync oprand char usage between mips and micromips
We should try our best to make mips32 using the same
oprand char with micromips. So for mips32, we use:
^ is added for 5bit sa oprand for some new DSPr2 instructions:
APPEND, PREPEND, PRECR_SRA[_R].PH.W
the LSB bit is 11, like RD.
+t is removed for coprocessor 0 destination register.
'E' does the samething.
+t is now used for RX oprand for MFTR/MTTR (MT ASE)
? is added for sel oprand for MFTR/MTTR (MT ASE)
For mips32, the position of sel in MFTR/MTTR is same with mfc0 etc,
while for micromips, they are different.
We also add an extesion format of cftc2/cttc2/mftc2/mfthc2/mttc2/mtthc2:
concatenating rs with rx as the index of control or data.
YunQiang Su [Tue, 16 May 2023 01:46:46 +0000 (09:46 +0800)]
MIPS: fix some ld testcases with compiler
1. config/default.exp:
use -mabi=32 not for -gnuabi64
xfail_from_runlist: remove an element and mark it xfail.
2. ld-elf/indirect.exp: xfail
indirect5a indirect5b indirect6a indirect6b
indirect5c indirect5d indirect6c indirect6d
3. ld-elf/pr23658-2: mips output is not common
4. ld-elf/shared.exp: non-run on mips: Build libpr16496b.so
5. ld-elfvers/vers.exp:
xfail vers4, vers4b
no-run on mips: vers24a, vers24b, vers24c
6. ld-gc/gc.exp: add -KPIC into asflags for pr13683, pr14265, pr19161
7. ld-mips-elf/mips-elf.exp:
use noarch for mips16-local-stubs-1, since it use -mips4
8. ld-plugin/lto.exp:
no-run on mips/linux: PR ld/12982
add -KPIC into asflags for lto-3r, lto-5r, PR ld/19317 (2)
xfail PR ld/15323 (4), PR ld/19317 (3)
9. ld-plugin/plugin.exp: xfail
plugin claimfile lost symbol
plugin claimfile replace symbol
plugin claimfile replace symbol
plugin claimfile lost symbol with source
plugin claimfile replace symbol with source
plugin claimfile resolve symbol with source
plugin 2 with source lib
load plugin 2 with source
plugin 3 with source lib
load plugin 3 with source
11. ld-selective/selective.exp: add -fno-PIC, which is needed for -mno-abicalls
12. ld-shared/shared.exp: xfail shared (non PIC), shared (PIC main, non PIC so)
YunQiang Su [Wed, 10 May 2023 13:22:41 +0000 (21:22 +0800)]
MIPS: fix -gnuabi64 testsuite
Test on:
mips64-linux-gnuabi64
mips64el-linux-gnuabi64
mipsisa64-linux-gnuabi64
mipsisa64el-linux-gnuabi64
mipsisa64r2-linux-gnuabi64
mipsisa64r2el-linux-gnuabi64
mipsisa64r6-linux-gnuabi64
mipsisa64r6el-linux-gnuabi64
YunQiang Su [Wed, 10 May 2023 07:50:19 +0000 (15:50 +0800)]
MIPS: fix r6 testsuites
Introduce
run_dump_test_o32l
run_dump_test_n32l
run_dump_test_n64l
Which use `-march=from-abi` for pre-R6 testcases,
like micromips/mips16e etc.
For cases doesn't use run_dump_test_*, we use
-mips32r2 for micromips32
-mips1 for mips16-32
-march=from-abi for testcases to o32/n32/n64 both/all.
Replace `addi` with `addiu` for some cases for both r6 and pre-R6.
Introduce some new testcases for r6 with FPXX/FP64.
Introduce new testcase: comdat-reloc-r6.
Skip `default` in mips_arch_list_matching if triple is mipsisa*, due to:
1)it will cannot match mipsr6@*.d: since mips32rN/mips64rN
will always be used, it won't be a problem.
2)some test think -march=mips64rN will alway true for mipsisa64rN,
which is not true now.
This patch fix testsuite for all r6-default gnu triples:
mipsisa32r6-linux-gnu
mipsisa32r6el-linux-gnu
mips-img-linux-gnu
mipsel-img-linux-gnu
mipsisa64r6-linux-gnu
mipsisa64r6el-linux-gnu
YunQiang Su [Wed, 10 May 2023 10:07:23 +0000 (18:07 +0800)]
MIPS: default r6 if vendor is img
This behavior is used by downstream toolchain since 2014.
We also set the default ABI for mips*-img-elf to O32.
The previous value is NO_ABI, which is not good default ABI.
We don't support mips64*-img* due to GCC doesn't support it,
and We believe that the multilib should be used for this case.
YunQiang Su [Sat, 6 May 2023 08:26:13 +0000 (16:26 +0800)]
MIPS: gas: alter 64 or 32 for mipsisa triples if march is implicit
When configure with triples mipsisa[32,64]rN[el,], the march value
is pinned to a fix value if not given explicitly. for example
1) mipsisa32r6-linux-gnu -n32 xx.s will complains that:
-march=mips32r6 is not compatible with the selected ABI
2) mipsisa64r2el-linux-gnu -o32 generates objects with 64bit CPU:
ELF 32-bit LSB relocatable, MIPS, MIPS64 rel2 version 1 (SYSV)
They are not good default behaviors: Let's alter the CPU info
Since we are using these triples as a regular linux distributions,
let's alter march according to ABI.
Tom de Vries [Sat, 3 Jun 2023 20:43:57 +0000 (22:43 +0200)]
[gdb/python] Fix doc string of valpy_const_value
In gdb/python/py-value.c, in the value_object_methods array I noticed:
...
{ "const_value", valpy_const_value, METH_NOARGS,
"Return a 'const' qualied version of the same value." },
...
Tom de Vries [Sat, 3 Jun 2023 20:43:57 +0000 (22:43 +0200)]
[gdb/guile] Fix doc string for value-optimized-out?
In gdb/guile/scm-value.c, I noticed in the value_functions array initializer:
...
{ "value-optimized-out?", 1, 0, 0,
as_a_scm_t_subr (gdbscm_value_optimized_out_p),
"\
Return #t if the value has been optimizd out." },
...
There's a typo in the doc string.
Tom de Vries [Sat, 3 Jun 2023 20:43:57 +0000 (22:43 +0200)]
[gdb/tui] Fix help text of show tui tab-width
I noticed:
...
(gdb) help show tui tab-width
Show the tab witdh, in characters, for the TUI.
This variable controls how many spaces are used to display a tab character.
...
a typo: "witdh".
Tom de Vries [Sat, 3 Jun 2023 20:43:57 +0000 (22:43 +0200)]
[gdb/cli] Fix help text of maint set ignore-prologue-end-flag
I noticed here:
...
(gdb) help maint set ignore-prologue-end-flag
Set if the PROLOGUE-END flag is ignored.
The PROLOGUE-END flag from the line-table entries is used to place \
breakpoints past the prologue of functions. Disabeling its use use forces \
the use of prologue scanners.
...
a typo in "Disabeling" and accidental word repetition "use use".
Alan Modra [Sat, 3 Jun 2023 03:09:06 +0000 (12:39 +0930)]
Re: More ecoff sanity checks
Yet another fuzzer fix.
* ecoff.c (ecoff_slurp_symbolic_header <FIX>): Zero counts when
associated pointer is zero.
(_bfd_ecoff_slurp_symbolic_info): Remove now unnecessary check.
Alan Modra [Thu, 1 Jun 2023 14:01:47 +0000 (23:31 +0930)]
loongarch readelf support
This fixes two buffer overflows found by fuzzers.
* readelf.c (target_specific_reloc_handling): Sanity check
loongarch reloc symbol index. Don't apply reloc after errors.
Reduce translation work of "invalid symbol index" error message.
Indu Bhagat [Thu, 1 Jun 2023 16:41:04 +0000 (09:41 -0700)]
libsframe: avoid using magic number
Define a new constant for the maximum number of stack offsets handled in
libsframe, and use it. Note that the SFrame format does not define such
a constant (limit). This is an implmentation-defined constant in
libsframe.
include/
* sframe-api.h (MAX_NUM_STACK_OFFSETS): New definition.
libsframe/
* sframe.c (sframe_fre_sanity_check_p): Use it.
Nelson Chu [Fri, 26 May 2023 10:05:34 +0000 (18:05 +0800)]
[PR ld/22263][PR ld/24676] RISC-V: Avoid spurious R_RISCV_NONE for TLS GD/IE.
For TLS GD/IE, add the same condition with the relocate_section in the
allocate_dynrelocs, to make sure we won't reserve redundant spaces
for dynamic relocations since the conservative estimatation.
After applying this patch, ld seems no longer generate the spurious
R_RISCV_NONE for pr22263-1 test, and the test in pr24676.
bfd/
PR ld/22263
PR ld/24676
* elfnn-riscv.c (RISCV_TLS_GD_IE_NEED_DYN_RELOC): New defined.
Set NEED_RELOC to true if TLS GD/IE needs dynamic relocations,
and INDX will be the dynamic index.
(allocate_dynrelocs): Don't reserve extra spaces in the rela.got
if RISCV_TLS_GD_IE_NEED_DYN_RELOC set need_reloc to false. This
condition needs to be same as relocate_section.
(relocate_section): Likewise, use the same condition as
allocate_dynrelocs.
Alan Modra [Wed, 31 May 2023 05:41:34 +0000 (15:11 +0930)]
Harden PowerPC64 OPD handling against fuzzers
PowerPC64 ELFv1 object files should have at most one .opd section, and
OPD handling in elf64-ppc.c makes use of this fact by caching some
.opd section info in the per-object bfd.tdata. This was done to avoid
another word in the target specific section data. Of course, fuzzers
don't respect the ABI, and even non-malicious users can accidentally
create multiple .opd sections. So it is better to avoid possible
buffer overflows and other confusion when OPD handling for a second
.opd section references data for the first .opd section, by keeping
the data per-section.
The patch also fixes a memory leak, and a corner case where I think we
could hit an assertion in opd_entry_value or read out of bounds in
ppc64_elf_branch_reloc doing a final link producing non-ppc64 output.
(It's a really rare corner case because not only would you need to be
linking ppc64 objects to non-ppc64 output, you'd also need a branch
reloc symbol to be defined in a .opd section of a non-ppc64 input.)
* elf64-ppc.c (is_ppc64_elf): Move earlier in file.
(ppc64_elf_branch_reloc): Check symbol bfd before accessing
ppc64 elf specific data structures.
(struct ppc64_elf_obj_tdata): Move opd union..
(struct _ppc64_elf_section_data): ..to here.
(ppc64_elf_before_check_relocs): Allow for opd sec_type
already set to sec_opd.
(ppc64_elf_check_relocs): Only set sec_type to sec_toc when
unset. Error for unexpected toc relocs.
(opd_entry_value): Return -1 when non-ppc64 rather than
asserting. Check and set sec_type too. Adjust for changed
location of contents and relocs.
(ppc64_elf_relocate_section): Adjust for changed location of
cached .opd relocs.
(ppc64_elf_free_cached_info): New function.
(bfd_elf64_bfd_free_cached_info): Define.
Alan Modra [Wed, 31 May 2023 11:47:48 +0000 (21:17 +0930)]
bfd_close and target free_cached_memory
bfd_free_cached_info is used in just one place in archive.c, which
means most times we reach bfd_close the function isn't called. On the
other hand, if bfd_free_cached_info is called we can't do much on the
bfd since it loses all its obj_alloc memory. This restricts what can
be done in a target _close_and_cleanup. In particular you can't look
at sections, which leads to duplication of code in target
close_and_cleanup and free_cached_info, eg. elfnn-aarch64.c.
Alan Modra [Tue, 30 May 2023 10:35:38 +0000 (20:05 +0930)]
section_by_target_index memory leak
The rs6000 backend can call coff_section_from_bfd_index from its
object_p function via coff_set_alignment_hook. If the object doesn't
match, or another target matches too, then the hash table needs to be
freed via a cleanup.
gprofng: 29470 The test suite should be made more flexible
I add two new targets (check-extra, check-install) for gprofng testing:
`make check` runs sanity testing for gprofng and takes ~30 secunds.
`make check-extra` runs all gprofng tests and takes ~20 minutus.
`make check-install` runs all gprofng tests and uses gprofng installation.
On aarch64, there are unwind problems in libgp-collector.so.
I set ACCT_FILTER to temporarily ignore problematic functions.
gprofng/ChangeLog
2023-05-25 Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
PR gprofng/29470
* Makefile.am: Add check-extra, check-install.
* Makefile.in: Rebuild
* testsuite/config/default.exp: Set the GPROFNG variable.
* testsuite/gprofng.display/display.exp: Updated the test list.
* testsuite/gprofng.display/jsynprog/Intface.java: Correct copyright.
* testsuite/gprofng.display/jsynprog/Launcher.java: Likewise.
* testsuite/gprofng.display/jsynprog/Makefile: Likewise.
* testsuite/gprofng.display/jsynprog/Routine.java: Likewise.
* testsuite/gprofng.display/jsynprog/Sub_Routine.java: Likewise.
* testsuite/gprofng.display/jsynprog/cloop.cc: Likewise.
* testsuite/gprofng.display/jsynprog/jsynprog.h: Likewise.
* testsuite/gprofng.display/jsynprog/jsynprog.java: Correct copyright.
Add the -j option to run the selected functions.
* testsuite/gprofng.display/synprog/check_results.pl:
Remove unused environment variable.
* testsuite/gprofng.display/synprog/synprog.c: Updated DEFAULT_COMMAND.
* testsuite/lib/Makefile.skel: Apply $(ACCT_FILTER).
* testsuite/lib/acct.pm: Ignore errors when $(ACCT_FILTER) is set.
* testsuite/lib/display-lib.exp: Add TARGET_FLAGS in make_args.
Tom Tromey [Wed, 31 May 2023 14:26:37 +0000 (08:26 -0600)]
Improve MI -dprintf-insert documentation
I found the documentation for -dprintf-insert a bit unclear. It
didn't mention the possibility of multiple arguments, and I also
noticed that it implied that the format parameter is optional, which
it is not.
While looking into this I also noticed a few comments in the
implementation that could also be improved.
Then, I noticed a repeated call to strlen in a loop condition, so I
fixed this up as well.
Tom de Vries [Wed, 31 May 2023 13:06:40 +0000 (15:06 +0200)]
[gdb/testsuite] Fix gdb.tui/pr30056.exp for native-extended-gdbserver
When running test-case gdb.tui/pr30056.exp with target board
native-extended-gdbserver, I run into:
...
Quit^[[K^M^[[B(gdb) PASS: gdb.tui/pr30056.exp: Control-C
Remote debugging from host ::1, port 38810^M
^M(failed reverse-i-search)`xyz': ^M(gdb) target extended-remote \
localhost:2346^[[7GWARNING: Timed out waiting for EOF in server after \
monitor exit
...
This is due to the fact that ^C doesn't abort the reverse-i-search. This
appears to be due to a readline problem. A PR is open about this: PR
cli/30498.
Add a KFAIL for the PR, and ensure that the isearch is aborted by using ^G,
such that we have a responsive prompt to handle the "monitor exit" command
that native-extended-gdbserver issues.
Tristan Gingold [Wed, 31 May 2023 10:20:55 +0000 (11:20 +0100)]
pe/coff - add support for base64 encoded long section names
PR 30444
* coffcode.h (coff_write_object_contents): Handle base64 encoding on PE. Also check for too large string table.
* coffgen.c (extract_long_section_name): New function extracted from ... (make_a_section_from_file): ... here. Add support for base64 long section names. (decode_base64): New function.
Tom de Vries [Wed, 31 May 2023 05:39:31 +0000 (07:39 +0200)]
[gdb/tui] Fix fingerprint for cmd-only layout
I added a cmd-only layout:
...
(gdb) tui new-layout cmd cmd 1
...
and set it:
...
(gdb) layout cmd
...
which gave me the expect result: only the cmd window in the screen.
However, after going back to layout src:
...
(gdb) layout src
...
I got a source window with only one line in it, and the cmd window taking most
of the screen.
I traced this back to tui_set_layout, where for both the old and the new
layout the fingerprint of the cmd window in the layout is taken. If the
fingerprint is the same, an effort will be done to preserve the command
window size.
The fingerprint is "VC" for both the old (cmd) and new (src) layouts, which
explains the behaviour.
I think this is essentially a bug in the finger print calculation, and it
should be "C" for the cmd layout.
Fix this by not adding a V or H in the fingerprint if the list size is one.
Andrew Burgess [Thu, 23 Mar 2023 12:12:38 +0000 (12:12 +0000)]
gdb: add support for %V to printf command
This commit adds a new format for the printf and dprintf commands:
'%V'. This new format takes any GDB expression and formats it as a
string, just as GDB would for a 'print' command, e.g.:
This new feature would effectively replace an existing feature of GDB,
the $_as_string builtin convenience function. However, the
$_as_string function has a few problems which this new feature solves:
1. $_as_string doesn't currently work when the inferior is not
running, e.g:
(gdb) printf "%s", $_as_string(a1)
You can't do that without a process to debug.
(gdb)
The reason for this is that $_as_string returns a value object with
string type. When we try to print this we call value_as_address,
which ends up trying to push the string into the inferior's address
space.
Clearly we could solve this problem, the string data exists in GDB, so
there's no reason why we have to push it into the inferior, but this
is an existing problem that would need solving.
2. $_as_string suffers from the fact that C degrades arrays to
pointers, e.g.:
The implementation of $_as_string is passed a gdb.Value object that is
a pointer, it doesn't understand that it's actually an array. Solving
this would be harder than issue #1 I think. The whole array to
pointer transformation is part of our expression evaluation. And in
most cases this is exactly what we want. It's not clear to me how
we'd (easily) tell GDB that we didn't want this reduction in _some_
cases. But I'm sure this is solvable if we really wanted to.
3. $_as_string is a gdb.Function sub-class, and as such is passed
gdb.Value objects. There's no super convenient way to pass formatting
options to $_as_string. By this I mean that the new %V feature
supports print formatting options. Ideally, we might want to add this
feature to $_as_string, we might imagine it working something like:
(gdb) printf "%s\n", $_as_string(a1,
elements = 3,
array_indexes = True)
where the first item is the value to print, while the remaining
options are the print formatting options. However, this relies on
Python calling syntax, which isn't something that convenience
functions handle. We could possibly rely on strictly positional
arguments, like:
(gdb) printf "%s\n", $_as_string(a1, 3, 1)
But that's clearly terrible as there's far more print formatting
options, and if you needed to set the 9th option you'd need to fill in
all the previous options.
And right now, the only way to pass these options to a gdb.Function is
to have GDB first convert them all into gdb.Value objects, which is
really overkill for what we want.
The new %V format solves all these problems: the string is computed
and printed entirely on the GDB side, we are able to print arrays as
actual arrays rather than pointers, and we can pass named format
arguments.
Finally, the $_as_string is sold in the manual as allowing users to
print the string representation of flag enums, so given:
So all functionality of $_as_string is replaced by %V. I'm not
proposing to remove $_as_string, there might be users currently
depending on it, but I am proposing that we don't push $_as_string in
the documentation.
As %V is a feature of printf, GDB's dprintf breakpoints naturally gain
access to this feature too. dprintf breakpoints can be operated in
three different styles 'gdb' (use GDB's printf), 'call' (call a
function in the inferior), or 'agent' (perform the dprintf on the
remote).
The use of '%V' will work just fine when dprintf-style is 'gdb'.
When dprintf-style is 'call' the format string and arguments are
passed to an inferior function (printf by default). In this case GDB
doesn't prevent use of '%V', but the documentation makes it clear that
support for '%V' will depend on the inferior function being called.
I chose this approach because the current implementation doesn't place
any restrictions on the format string when operating in 'call' style.
That is, the user might already be calling a function that supports
custom print format specifiers (maybe including '%V') so, I claim, it
would be wrong to block use of '%V' in this case. The documentation
does make it clear that users shouldn't expect this to "just work"
though.
When dprintf-style is 'agent' then GDB does no support the use of
'%V' (right now). This is handled at the point when GDB tries to
process the format string and send the dprintf command to the remote,
here's an example:
Reading symbols from /tmp/hello.x...
(gdb) dprintf call_me, "%V", a1
Dprintf 1 at 0x401152: file /tmp/hello.c, line 8.
(gdb) set sysroot /
(gdb) target remote | gdbserver --once - /tmp/hello.x
Remote debugging using | gdbserver --once - /tmp/hello.x
stdin/stdout redirected
Process /tmp/hello.x created; pid = 3088822
Remote debugging using stdio
Reading symbols from /lib64/ld-linux-x86-64.so.2...
(No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
0x00007ffff7fd3110 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) set dprintf-style agent
(gdb) c
Continuing.
Unrecognized format specifier 'V' in printf
Command aborted.
(gdb)
This is exactly how GDB would handle any other invalid format
specifier, for example:
Reading symbols from /tmp/hello.x...
(gdb) dprintf call_me, "%Q", a1
Dprintf 1 at 0x401152: file /tmp/hello.c, line 8.
(gdb) set sysroot /
(gdb) target remote | gdbserver --once - /tmp/hello.x
Remote debugging using | gdbserver --once - /tmp/hello.x
stdin/stdout redirected
Process /tmp/hello.x created; pid = 3089193
Remote debugging using stdio
Reading symbols from /lib64/ld-linux-x86-64.so.2...
(No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
0x00007ffff7fd3110 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) set dprintf-style agent
(gdb) c
Continuing.
Unrecognized format specifier 'Q' in printf
Command aborted.
(gdb)
The error message isn't the greatest, but improving that can be put
off for another day I hope.
Reviewed-By: Eli Zaretskii <eliz@gnu.org> Acked-By: Simon Marchi <simon.marchi@efficios.com>
Simon Marchi [Fri, 21 Apr 2023 13:45:30 +0000 (09:45 -0400)]
gdb: add interp::on_about_to_proceed method
Same idea as previous patches, but for about_to_proceed. We only need
(and want, as far as the mi_interp implementation is concerned) to
notify the interpreter that caused the proceed.
Simon Marchi [Fri, 21 Apr 2023 13:45:30 +0000 (09:45 -0400)]
gdb: add interp::on_inferior_disappeared method
Same idea as previous patches, but for inferior_disappeared.
For symmetry with on_inferior_appeared, I named this one
on_inferior_disappeared, despite the observer being called
inferior_exit. This is called when detaching an inferior, so I think
that calling it "disappeared" is a bit less misleading (the observer
should probably be renamed later).
Simon Marchi [Fri, 21 Apr 2023 13:45:30 +0000 (09:45 -0400)]
gdb: add interp::on_inferior_added method
Same idea as previous patches, but for inferior_added.
mi_interp::init avoided using mi_inferior_added, since, as the comment
used to say, it would notify all MI interpreters. Now, it's easy to
only notify the new interpreter, so it's possible to just call the
on_inferior_added method in mi_interp::init.
Simon Marchi [Thu, 20 Apr 2023 19:47:59 +0000 (15:47 -0400)]
gdb: add interp::on_sync_execution_done method
Same as previous patches, but for sync_execution_done. Except that
here, we only want to notify the interpreter that is executing the
command, not all interpreters.
Simon Marchi [Thu, 20 Apr 2023 18:46:58 +0000 (14:46 -0400)]
gdb: add interp::on_exited method
Same as previous patch, but for exited. Remove the exited observable,
since nothing uses it anymore, and we don't have anything coming that
will use it.
Simon Marchi [Thu, 20 Apr 2023 18:02:28 +0000 (14:02 -0400)]
gdb: add interp::on_signal_exited method
Same as previous patch, but for signal_exited. Remove the signal_exited
observable, since nothing uses it anymore, and we don't have anything
coming that will use it.
Simon Marchi [Wed, 1 Mar 2023 21:48:36 +0000 (16:48 -0500)]
gdb: add interp::on_signal_received method
Instead of having the interpreter code registering observers for the
signal_received observable, add a "signal_received" virtual method to
struct interp. Add a interps_notify_signal_received function that loops
over all UIs and calls the signal_received method on the interpreter.
Finally, add a notify_signal_received function that calls
interps_notify_signal_received and then notifies the observers. Replace
all existing notifications to the signal_received observers with calls
to notify_signal_received.
Before this patch, the CLI and MI code both register a signal_received
observer. These observer go over all UIs, and, for those that have a
interpreter of the right kind, print the stop notifiation.
After this patch, we have just one "loop over all UIs", inside
interps_notify_signal_received. Since the interp::on_signal_received
method gets called once for each interpreter, the implementations only
need to deal with the current interpreter (the "this" pointer).
The motivation for this patch comes from a future patch, that makes the
amdgpu code register an observer to print a warning after the CLI's
signal stop message. Since the amdgpu and the CLI code both use
observers, the order of the two messages is not stable, unless we define
the priority using the observer dependency system. However, the
approach of using virtual methods on the interpreters seems like a good
change anyway, I think it's more straightforward and simple to
understand than the current solution that uses observers. We are sure
that the amdgpu message gets printed after the CLI message, since
observers are notified after interpreters.
Keep the signal_received, even if nothing uses if, because we will be
using it in the upcoming amdgpu patch implementing the warning described
above.
Tom de Vries [Tue, 30 May 2023 15:49:31 +0000 (17:49 +0200)]
[gdb] Mention --with/without-system-readline for --configuration
Simon reported that the new test-case gdb.tui/pr30056.exp fails with system
readline.
This is because the test-case requires a fix in readline that's present in our
in-repo copy of readline, but most likely not in any system readline yet.
Fix this by:
- mentioning --with-system-readline or --without-system-readline in the
configuration string.
- adding a new proc with_system_readline that makes this information available
in the testsuite.
- using this in test-case gdb.tui/pr30056.exp to declare it unsupported for
--with-system-readline.
Tested on x86_64-linux.
Reported-By: Simon Marchi <simon.marchi@efficios.com> Approved-By: Simon Marchi <simon.marchi@efficios.com>
Nick Clifton [Tue, 30 May 2023 14:43:24 +0000 (15:43 +0100)]
Improve header information displayed with objdump -P for PE binaries.
* od-pe.c (targ_info): New array.
(get_target_specific_info): New function.
(decode_machine_number): Retire. Use get_target_specific_info instead.
(is_pe_object_magic): Likewise.
(dump_pe_file_header): Display more information.
Rework layout to be similar to that from 'objdump -p'.
Add code to handle larger than normnal AOUT headers.
mengqinggang [Thu, 1 Dec 2022 08:17:46 +0000 (16:17 +0800)]
LoongArch: gas: Add support for linker relaxation.
Add gas -mrelax and -mno-relax option.
Add R_LARCH_RELAX reloc for instrction if it can be relaxed.
ADD R_LARCH_ALIGN reloc for align pseudo instruction because relax.
Add ADD/SUB reloc pair for debug and exception data to calculate symbol
substraction because relax.
gas/ChangeLog:
* config/tc-loongarch.c:
(struct loongarch_cl_insn): New macro_id member.
(enum options): New OPTION_RELAX and OPTION_NO_RELAX.
(struct option): New mrelax and mno-relax.
(md_parse_option): Likewise.
(get_internal_label):
(loongarch_args_parser_can_match_arg_helper): Generate relax reloc.
(move_insn): Set fx_frag and fx_where if exist.
(append_fixp_and_insn): Call frag_wane and frag_new for linker relax
relocs.
(loongarch_assemble_INSNs): New loongarch_cl_insn pointer parameter.
(md_assemble): Fix function call.
(fix_reloc_insn): Likewise.
(md_apply_fix): Generate ADD/SUB reloc pair for debug and exception
data.
(loongarch_fix_adjustable): Delete.
(md_convert_frag): Generate new fix.
(loongarch_pre_output_hook): New function.
(loongarch_make_nops): Likewise.
(loongarch_frag_align_code): Likewise.
(loongarch_insert_uleb128_fixes): Likewise.
(loongarch_md_finish): Likewise.
* config/tc-loongarch.h
(md_allow_local_subtract): New macro define.
(loongarch_frag_align_code): New declare.
(md_do_align): Likewise.
(loongarch_fix_adjustable): Delete.
(tc_fix_adjustable): New macro define.
(TC_FORCE_RELOCATION_SUB_SAME): Likewise.
(TC_LINKRELAX_FIXUP): Likewise.
(TC_FORCE_RELOCATION_LOCAL): Likewise.
(DWARF2_USE_FIXED_ADVANCE_PC): Likewise.
(MD_APPLY_SYM_VALUE): Likewise.
(tc_symbol_new_hook): New extern.
(NOP_OPCODE): Delete.
(loongarch_pre_output_hook): New macro define.
(md_pre_output_hook): Likewise.
(md_finish): Likewise.
(loongarch_md_finish): New extern.
* testsuite/gas/all/align.d: Mark as unsupported on LoongArch.
* testsuite/gas/all/gas.exp: Xfail loongarch*-*.
* testsuite/gas/all/relax.d: Likewise.
* testsuite/gas/elf/dwarf-5-irp.d: Likewise.
* testsuite/gas/elf/dwarf-5-loc0.d: Likewise.
* testsuite/gas/elf/dwarf-5-macro-include.d: Likewise.
* testsuite/gas/elf/dwarf-5-macro.d: Likewise.
* testsuite/gas/elf/dwarf2-11.d: Likewise.
* testsuite/gas/elf/dwarf2-15.d: Likewise.
* testsuite/gas/elf/dwarf2-16.d: Likewise.
* testsuite/gas/elf/dwarf2-17.d: Likewise.
* testsuite/gas/elf/dwarf2-18.d: Likewise.
* testsuite/gas/elf/dwarf2-19.d: Likewise.
* testsuite/gas/elf/dwarf2-5.d: Likewise.
* testsuite/gas/elf/ehopt0.d: Likewise.
* testsuite/gas/elf/elf.exp: Likewise.
* testsuite/gas/elf/section11.d: Likewise.
* testsuite/gas/lns/lns.exp: Likewise.
* testsuite/gas/loongarch/jmp_op.d: Regenerated.
* testsuite/gas/loongarch/li.d: Likewise.
* testsuite/gas/loongarch/macro_op.d: Likewise.
* testsuite/gas/loongarch/macro_op_32.d: Likewise.
* testsuite/gas/loongarch/macro_op_large_abs.d: Likewise.
* testsuite/gas/loongarch/macro_op_large_pc.d: Likewise.
* testsuite/gas/loongarch/relax_align.d: New test.
* testsuite/gas/loongarch/relax_align.s: New test.
* testsuite/gas/loongarch/uleb128.d: New test.
* testsuite/gas/loongarch/uleb128.s: New test.
mengqinggang [Thu, 1 Dec 2022 07:03:42 +0000 (15:03 +0800)]
LoongArch: bfd: Add support for linker relaxation.
Add relax support and related relocs in bfd.
bfd/ChangeLog:
* bfd-in2.h: Add relocs related to relax.
* elfnn-loongarch.c (struct loongarch_elf_link_hash_table): New integer
pointer (data_segment_phase) to monitor the data segment phase.
(loongarch_elf_check_relocs): Swap B21/B26 reloc sequence.
(loongarch_elf_adjust_dynamic_symbol): Fix code format.
(loongarch_reloc_rewrite_imm_insn): Fix function call.
(perform_relocation): Handle new relocs related to relax.
(RELOCATE_CALC_PC32_HI20): Fix code format.
(RELOCATE_CALC_PC64_HI32): Likewise.
(loongarch_elf_relocate_section): Handle new relocs related to relax.
(loongarch_relax_delete_bytes): New function.
(loongarch_relax_pcala_addi): Likewise.
(loongarch_relax_pcala_ld): Likewise.
(bfd_elfNN_loongarch_set_data_segment_info): Likewise.
(loongarch_relax_align): Likewise.
(loongarch_elf_relax_section): Likewise.
(bfd_elfNN_bfd_relax_section): New macro define.
* elfxx-loongarch.c (reloc_bits): New bfd point parameter.
(reloc_bits_b16): Likewise.
(reloc_bits_b21): Likewise.
(reloc_bits_b26): Likewise.
(loongarch_adjust_reloc_bitsfield): Likewise.
(reloc_bits_pcrel20_s2): New function.
(loongarch_elf_add_sub_reloc): Likewise.
(loongarch_elf_add_sub_reloc_uleb128): Likewise.
(loongarch_write_unsigned_leb128): New function.
* elfxx-loongarch.h (loongarch_adjust_reloc_bitsfield): New bfd point
parameter.
(bfd_elf32_loongarch_set_data_segment_info): New declare.
(bfd_elf64_loongarch_set_data_segment_info): Likewise.
(loongarch_write_unsigned_leb128): Likewise.
* libbfd.h: Add relocs related to relax.
* reloc.c: Add relocs related to relax.
projects / thirdparty / binutils-gdb.git / log
