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When running test-case gdb.base/watchpoint-running on ppc64le-linux (and
similar on arm-linux), we get:
...
(gdb) watch global_var^M
warning: Error when detecting the debug register interface. \
Debug registers will be unavailable.^M
Watchpoint 2: global_var^M
(gdb) FAIL: $exp: all-stop: hardware: watch global_var
FAIL: $exp: all-stop: hardware: watchpoint hit (timeout)
...
The problem is that ppc_linux_dreg_interface::detect fails to detect the
hardware watchpoint interface, because the calls to ptrace return with errno
set to ESRCH.
This is a feature of ptrace: if a call is done while the tracee is not
ptrace-stopped, it returns ESRCH.
Indeed, in the test-case "watch global_var" is executed while the inferior is
running, and that triggers the first call to ppc_linux_dreg_interface::detect.
And because the detection failure is cached, subsequent attempts at setting
hardware watchpoints will also fail, even if the tracee is ptrace-stopped.
The way to fix this is to make sure that ppc_linux_dreg_interface::detect is
called when we know that the thread is ptrace-stopped, which in the current
setup is best addressed by using target-specific post_attach and
post_startup_inferior overrides. However, as we can see in
aarch64_linux_nat_target, that causes code duplication.
Fix this by:
- defining a new target hook low_init_process, called from
linux_init_ptrace_procfs, which is called from both
linux_nat_target::post_attach and linux_nat_target::post_startup_inferior,
- adding implementations for ppc_linux_nat_target and arm_linux_nat_target
that detect the hardware watchpoint interface,
- replacing the aarch64_linux_nat_target implementations of post_attach and
post_startup_inferior with a low_init_process implementation.
Tested on ppc64le-linux, arm-linux, aarch64-linux and x86_64-linux.
Co-Authored-By: Tom de Vries <tdevries@suse.de>
Approved-By: Luis Machado <luis.machado@arm.com>
PR tdep/31834
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31834
PR tdep/31705
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31705
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Most files including gdbcmd.h currently rely on it to access things
actually declared in cli/cli-cmds.h (setlist, showlist, etc). To make
things easy, replace all includes of gdbcmd.h with includes of
cli/cli-cmds.h. This might lead to some unused includes of
cli/cli-cmds.h, but it's harmless, and much faster than going through
the 170 or so files by hand.
Change-Id: I11f884d4d616c12c05f395c98bbc2892950fb00f
Approved-By: Tom Tromey <tom@tromey.com>
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This commit introduces a new target hook, target_is_address_tagged,
which is used instead of the gdbarch_tagged_address_p gdbarch hook in
the upper layer (printcmd.c).
This change enables easy specialization of memory tagging address
check per target in the future. As target_is_address_tagged continues
to utilize the gdbarch_tagged_address_p hook, there is no change in
behavior for all the targets that use the new target hook (i.e., the
remote.c, aarch64-linux-nat.c, and corelow.c targets).
Just the gdbarch_tagged_address_p signature is changed for convenience,
since target_is_address_tagged takes the address to be checked as a
CORE_ADDR type.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Approved-By: Luis Machado <luis.machado@arm.com>
Tested-By: Luis Machado <luis.machado@arm.com>
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Now that defs.h, server.h and common-defs.h are included via the
`-include` option, it is no longer necessary for source files to include
them. Remove all the inclusions of these files I could find. Update
the generation scripts where relevant.
Change-Id: Ia026cff269c1b7ae7386dd3619bc9bb6a5332837
Approved-By: Pedro Alves <pedro@palves.net>
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On aarch64-linux, with test-case gdb.base/watch-bitfields.exp I run into:
...
(gdb) continue^M
Continuing.^M
^M
Hardware watchpoint 2: -location q.a^M
^M
Old value = 1^M
New value = 0^M
main () at watch-bitfields.c:42^M
42 q.h--;^M
(gdb) FAIL: $exp: -location watch against bitfields: q.e: 0->5: continue
...
In a minimal form, if we step past line 37 which sets q.e, and we have a
watchpoint set on q.e, it triggers:
...
$ gdb -q -batch watch-bitfields -ex "b 37" -ex run -ex "watch q.e" -ex step
Breakpoint 1 at 0x410204: file watch-bitfields.c, line 37.
Breakpoint 1, main () at watch-bitfields.c:37
37 q.e = 5;
Hardware watchpoint 2: q.e
Hardware watchpoint 2: q.e
Old value = 0
New value = 5
main () at /home/vries/gdb/src/gdb/testsuite/gdb.base/watch-bitfields.c:38
38 q.f = 6;
...
However, if we set in addition a watchpoint on q.a, the watchpoint on q.e
doesn't trigger.
How does this happen?
Bitfield q.a is just bit 0 of byte 0, and bitfield q.e is bit 4..7 of byte 1
and bit 1 of byte 2. So, watch q.a should watch byte 0, and watch q.e should
watch bytes 1 and 2.
Using "maint set show-debug-regs on" (and some more detailed debug prints) we
get:
...
WP2: addr=0x440028 (orig=0x440029), ctrl=0x000000d5, ref.count=1
ctrl: enabled=1, offset=1, len=2
WP3: addr=0x440028 (orig=0x440028), ctrl=0x00000035, ref.count=1
ctrl: enabled=1, offset=0, len=1
...
which matches that.
When executing line 37, a hardware watchpoint trap triggers and we hit
aarch64_stopped_data_address with addr_trap == 0x440028:
...
(gdb) p /x addr_trap
$1 = 0x440028
....
and since the loop in aarch64_stopped_data_address walks backward, we check
WP3 first, which matches, and consequently target_stopped_by_watchpoint
returns true in watchpoints_triggered.
Likewise for target_stopped_data_address, which also returns addr == 0x440028.
Watchpoints_triggered matches watchpoint q.a to that address, and sets
watch_triggered_yes.
However, subsequently the value of q.a is checked, and it's the same value as
before (becase the insn in line 37 didn't change q.a), so the watchpoint
hardware trap is not reported to the user.
The problem originates from that fact that aarch64_stopped_data_address picked
WP3 instead of WP2.
There's something we can do about this. In the example above, both
target_stopped_by_watchpoint and target_stopped_data_address returned true.
Instead we can return true in target_stopped_by_watchpoint but false in
target_stopped_data_address. This lets watchpoints_triggered known that a
watchpoint was triggered, but we don't know where, and both watchpoints
get set to watch_triggered_unknown.
Subsequently, the values of both q.a and q.e are checked, and since q.e is not
the same value as before, the watchpoint hardware trap is reported to the user.
Note that this works well for regular (write) watchpoints (watch command), but
not for read watchpoints (rwatch command), because for those no value is
checked. Likewise for access watchpoints (awatch command).
So, fix this by:
- passing a nullptr in aarch64_fbsd_nat_target::stopped_by_watchpoint and
aarch64_linux_nat_target::stopped_by_watchpoint to make clear we're not
interested in the stop address,
- introducing a two-phase approach in aarch64_stopped_data_address, where:
- phase one handles access and read watchpoints, as before, and
- phase two handles write watchpoints, where multiple matches cause:
- return true if addr_p == null, and
- return false if addr_p != null.
Tested on aarch64-linux.
Approved-By: Luis Machado <luis.machado@arm.com>
PR tdep/31214
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31214
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Commit 92d48a1e4eac ("Add an arm-tls feature which includes the tpidruro
register from CP15.") introduced the org.gnu.gdb.arm.tls feature, which
adds the tpidruro register, and unconditionally enabled it in
aarch32_create_target_description.
In Linux, the tpidruro register isn't available via ptrace in the 32-bit
kernel but it is available for an aarch32 program running under an arm64
kernel via the ptrace compat interface. This isn't currently implemented
however, which causes GDB on arm-linux with 64-bit kernel to list the
register but show it as unavailable, as reported by Tom de Vries:
$ gdb -q -batch a.out -ex start -ex 'p $tpidruro'
Temporary breakpoint 1 at 0x512
Temporary breakpoint 1, 0xaaaaa512 in main ()
$1 = <unavailable>
Simon Marchi then clarified:
> The only time we should be seeing some "unavailable" registers or memory
> is in the context of tracepoints, for things that are not collected.
> Seeing an unavailable register here is a sign that something is not
> right.
Therefore, disable the TLS feature in aarch32 target descriptions for Linux
and NetBSD targets (the latter also doesn't seem to support accessing
tpidruro either, based on a quick look at arm-netbsd-nat.c).
This patch fixes the following tests:
Running gdb.base/inline-frame-cycle-unwind.exp ...
FAIL: gdb.base/inline-frame-cycle-unwind.exp: cycle at level 3: backtrace when the unwind is broken at frame 3
FAIL: gdb.base/inline-frame-cycle-unwind.exp: cycle at level 5: backtrace when the unwind is broken at frame 5
FAIL: gdb.base/inline-frame-cycle-unwind.exp: cycle at level 1: backtrace when the unwind is broken at frame 1
Tested with Ubuntu 22.04.3 on armv8l-linux-gnueabihf in native,
native-gdbserver and native-extended-gdbserver targets with no regressions.
PR tdep/31418
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31418
Approved-By: John Baldwin <jhb@FreeBSD.org>
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This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
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C++17 makes the second parameter to static_assert optional, so we can
remove gdb_static_assert now.
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This function is just a wrapper around the current inferior's gdbarch.
I find that having that wrapper just obscures where the arch is coming
from, and that it's often used as "I don't know which arch to use so
I'll use this magical target_gdbarch function that gets me an arch" when
the arch should in fact come from something in the context (a thread,
objfile, symbol, etc). I think that removing it and inlining
`current_inferior ()->arch ()` everywhere will make it a bit clearer
where that arch comes from and will trigger people into reflecting
whether this is the right place to get the arch or not.
Change-Id: I79f14b4e4934c88f91ca3a3155f5fc3ea2fadf6b
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
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Make the inferior's gdbarch field private, and add getters and setters.
This helped me by allowing putting breakpoints on set_arch to know when
the inferior's arch was set. A subsequent patch in this series also
adds more things in set_arch.
Change-Id: I0005bd1ef4cd6b612af501201cec44e457998eec
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
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SME2 defines a new 512-bit register named ZT0, and it is only available
if SME is also supported. The ZT0 state is valid only if the SVCR ZA bit
is enabled. Otherwise its contents are empty (0).
The target description is dynamic and gets generated at runtime based on the
availability of the feature.
Validated under Fast Models.
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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The SME (Scalable Matrix Extension) [1] exposes a new matrix register ZA with
variable sizes. It also exposes a new mode called streaming mode.
Similarly to SVE, the ZA register size is dictated by a vector length, but the
SME vector length is called streaming vetor length. The total size for
ZA in a given moment is svl x svl.
In streaming mode, the SVE registers have their sizes based on svl rather than
the regular vector length (vl).
The feature detection is controlled by the HWCAP2_SME bit, but actual support
should be validated by attempting a ptrace call for one of the new register
sets: NT_ARM_ZA and NT_ARM_SSVE.
Due to its large size, the ZA register is exposed as a vector of bytes, but we
introduce a number of pseudo-registers that gives various different views
into the ZA contents. These can be arranged in a couple categories: tiles and
tile slices.
Tiles are matrices the same size or smaller than ZA. Tile slices are vectors
which map to ZA's rows/columns in different ways.
A new dynamic target description is provided containing the ZA register, the SVG
register and the SVCR register. The size of ZA, like the SVE vector registers,
is based on the vector length register SVG (VG for SVE).
This patch enables SME register support for gdb.
[1] https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/scalable-matrix-extension-armv9-a-architecture
Co-Authored-By: Ezra Sitorus <ezra.sitorus@arm.com>
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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This is a patch in preparation to upcoming patches enabling SME support. It
attempts to simplify the gdb/gdbserver shared interface used to read/write
SVE registers.
Where the current code makes use of unique_ptr, allocating a new buffer by
hand and passing a buffer around, this patch makes that code use
gdb::byte_vector and passes a reference to this byte vector to the functions,
allowing the functions to have ready access to the size of the buffer.
It also shares a bit more code between gdb and gdbserver, in particular around
handling of ptrace get/set requests for SVE.
I think gdbserver could be refactored to handle register reads/writes more
like gdb's native layer as opposed to letting the generic linux-low layer do
the ptrace calls. This is not very flexible and assumes one size for the
responses. If you have something like NT_ARM_SVE, where you can have either
FPSIMD or SVE contents, it doesn't work that well.
I didn't want to change that interface right now as it is a bit too much work
and touches all the targets, some of which I can't easily test.
Hence the reason why the buffer the generic linux-now passes down to
linux-aarch64-low is unused or ignored.
No user-visible changes should happen as part of this refactor other than a
slightly reworded warning message.
While doing the refactor, I also noticed what seems to be a mistake in checking
if the register cache contains active (non-zero) SVE data.
For instance, the original code did something like this in
aarch64_sve_regs_copy_from_reg_buf:
has_sve_state |= reg_buf->raw_compare (AARCH64_SVE_Z0_REGNUM + i
reg, sizeof (__int128_t));
"reg" is a zeroed-out buffer that we compare the Z register contents
past the first 128 bits. The problem here is that raw_compare returns
1 if the contents compare the same, which means has_sve_state will be
true. But if we compared the Z register contents to 0, it means we
*do not* have SVE state, and therefore has_sve_state should be false.
The consequence of this mistake is that we convert the initial
FPSIMD-formatted data we get from ptrace for the NT_ARM_SVE register
set to a SVE-formatted one.
In the end, this doesn't cause user-visible differences because the
values of both the Z and V registers will still be the same. But the
logic is not correct.
I used the opportunity to fix this, and it gets tested later on by
the additional SME tests.
I do plan on submitting some SVE-specific tests to make sure we have
a bit more coverage in GDB's testsuite.
Regression-tested on aarch64-linux Ubuntu 22.04/20.04.
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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In preparation to the SME support patches, rename the SVE-specific files to
something a bit more meaningful that can be shared with the SME code.
In this case, I've renamed the "sve" in the names to "scalable".
No functional changes.
Regression-tested on aarch64-linux Ubuntu 22.04/20.04.
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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I noticed we don't handle register reads/writes in the best way for native
AArch64 Linux. Some other registers are fetched/stored even if upper level
code told us to fetch a particular register number.
Fix this by being more strict about which registers we touch when
reading/writing them in the native AArch64 Linux layer.
There should be no user-visible changes due to this patch.
Regression-tested on aarch64-linux Ubuntu 22.04/20.04.
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Don't invoke ptrace in the target read_description method if there is
not an active inferior to query via ptrace. Instead, use the default
register set for the architecture.
Previously the native target could report an error from a failed
ptrace operation when fetching a tdesc without an attached process.
For example on Linux x86-64:
(gdb) target native
Done. Use the "run" command to start a process.
(gdb) unset tdesc filename
Couldn't get CS register: No such process.
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Clang doesn't accept initializer syntax for variable-length
arrays in C. Just use memset instead.
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This commit is the result of running the gdb/copyright.py script,
which automated the update of the copyright year range for all
source files managed by the GDB project to be updated to include
year 2023.
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PR gdb/28947
The address_significant gdbarch setting was introduced as a way to remove
non-address bits from pointers, and it is specified by a constant. This
constant represents the number of address bits in a pointer.
Right now AArch64 is the only architecture that uses it, and 56 was a
correct option so far.
But if we are using Pointer Authentication (PAuth), we might use up to 2 bytes
from the address space to store the required information. We could also have
cases where we're using both PAuth and MTE.
We could adjust the constant to 48 to cover those cases, but this doesn't
cover the case where GDB needs to sign-extend kernel addresses after removal
of the non-address bits.
This has worked so far because bit 55 is used to select between kernel-space
and user-space addresses. But trying to clear a range of bits crossing the
bit 55 boundary requires the hook to be smarter.
The following patch renames the gdbarch hook from significant_addr_bit to
remove_non_address_bits and passes a pointer as opposed to the number of
bits. The hook is now responsible for removing the required non-address bits
and sign-extending the address if needed.
While at it, make GDB and GDBServer share some more code for aarch64 and add a
new arch-specific testcase gdb.arch/aarch64-non-address-bits.exp.
Bug-url: https://sourceware.org/bugzilla/show_bug.cgi?id=28947
Approved-By: Simon Marchi <simon.marchi@efficios.com>
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With the AArch64 Scalable Matrix Extension we have a new TPIDR2 register, and
it will be added to the existing NT_ARM_TLS register set. Kernel patches are
being reviewed here:
https://lore.kernel.org/linux-arm-kernel/20220818170111.351889-1-broonie@kernel.org/
From GDB's perspective, we handle it in a similar way to the existing TPIDR
register. But we need to consider cases of systems that only have TPIDR and
systems that have both TPIDR and TPIDR2.
With that in mind, the following patch adds the required code to support
TPIDR2 and turns the org.gnu.gdb.aarch64.tls feature into a
dynamically-generated target description as opposed to a static target
description containing only TPIDR.
That means we can remove the gdb/features/aarch64-tls.xml file and replace the
existing gdb/features/aarch64-tls.c auto-generated file with a new file that
dynamically generates the target description containing either TPIDR alone or
TPIDR and TPIDR2.
In the future, when *BSD's start to support this register, they can just
enable it as is being done for the AArch64 Linux target.
The core file read/write code has been updated to support TPIDR2 as well.
On GDBserver's side, there is a small change to the find_regno function to
expose a non-throwing version of it.
It always seemed strange to me how find_regno causes the whole operation to
abort if it doesn't find a particular register name. The patch moves code
from find_regno into find_regno_no_throw and makes find_regno call
find_regno_no_throw instead.
This allows us to do register name lookups to find a particular register
number without risking erroring out if nothing is found.
The patch also adjusts the feature detection code for aarch64-fbsd, since
the infrastructure is shared amongst all aarch64 targets. I haven't added
code to support TPIDR2 in aarch64-fbsd though, as I'm not sure when/if
that will happen.
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There's a flaw in the interaction of the auxv caching and the fact that
target_auxv_search allows reading auxv from an arbitrary target_ops
(passed in as a parameter). This has consequences as explained in this
thread:
https://inbox.sourceware.org/gdb-patches/20220719144542.1478037-1-luis.machado@arm.com/
In summary, when loading an AArch64 core file with MTE support by
passing the executable and core file names directly to GDB, we see the
MTE info:
$ ./gdb -nx --data-directory=data-directory -q aarch64-mte-gcore aarch64-mte-gcore.core
...
Program terminated with signal SIGSEGV, Segmentation fault
Memory tag violation while accessing address 0x0000ffff8ef5e000
Allocation tag 0x1
Logical tag 0x0.
#0 0x0000aaaade3d0b4c in ?? ()
(gdb)
But if we do it as two separate commands (file and core) we don't:
$ ./gdb -nx --data-directory=data-directory -q -ex "file aarch64-mte-gcore" -ex "core aarch64-mte-gcore.core"
...
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000aaaade3d0b4c in ?? ()
(gdb)
The problem with the latter is that auxv data gets improperly cached
between the two commands. When executing the file command, auxv gets
first queried here, when loading the executable:
#0 target_auxv_search (ops=0x55555b842400 <exec_ops>, match=0x9, valp=0x7fffffffc5d0) at /home/simark/src/binutils-gdb/gdb/auxv.c:383
#1 0x0000555557e576f2 in svr4_exec_displacement (displacementp=0x7fffffffc8c0) at /home/simark/src/binutils-gdb/gdb/solib-svr4.c:2482
#2 0x0000555557e594d1 in svr4_relocate_main_executable () at /home/simark/src/binutils-gdb/gdb/solib-svr4.c:2878
#3 0x0000555557e5989e in svr4_solib_create_inferior_hook (from_tty=1) at /home/simark/src/binutils-gdb/gdb/solib-svr4.c:2933
#4 0x0000555557e6e49f in solib_create_inferior_hook (from_tty=1) at /home/simark/src/binutils-gdb/gdb/solib.c:1253
#5 0x0000555557f33e29 in symbol_file_command (args=0x7fffffffe01c "aarch64-mte-gcore", from_tty=1) at /home/simark/src/binutils-gdb/gdb/symfile.c:1655
#6 0x00005555573319c3 in file_command (arg=0x7fffffffe01c "aarch64-mte-gcore", from_tty=1) at /home/simark/src/binutils-gdb/gdb/exec.c:555
#7 0x0000555556e47185 in do_simple_func (args=0x7fffffffe01c "aarch64-mte-gcore", from_tty=1, c=0x612000047740) at /home/simark/src/binutils-gdb/gdb/cli/cli-decode.c:95
#8 0x0000555556e551c9 in cmd_func (cmd=0x612000047740, args=0x7fffffffe01c "aarch64-mte-gcore", from_tty=1) at /home/simark/src/binutils-gdb/gdb/cli/cli-decode.c:2543
#9 0x00005555580e63fd in execute_command (p=0x7fffffffe02c "e", from_tty=1) at /home/simark/src/binutils-gdb/gdb/top.c:692
#10 0x0000555557771913 in catch_command_errors (command=0x5555580e55ad <execute_command(char const*, int)>, arg=0x7fffffffe017 "file aarch64-mte-gcore", from_tty=1, do_bp_actions=true) at /home/simark/src/binutils-gdb/gdb/main.c:513
#11 0x0000555557771fba in execute_cmdargs (cmdarg_vec=0x7fffffffd570, file_type=CMDARG_FILE, cmd_type=CMDARG_COMMAND, ret=0x7fffffffd230) at /home/simark/src/binutils-gdb/gdb/main.c:608
#12 0x00005555577755ac in captured_main_1 (context=0x7fffffffda10) at /home/simark/src/binutils-gdb/gdb/main.c:1299
#13 0x0000555557775c2d in captured_main (data=0x7fffffffda10) at /home/simark/src/binutils-gdb/gdb/main.c:1320
#14 0x0000555557775cc2 in gdb_main (args=0x7fffffffda10) at /home/simark/src/binutils-gdb/gdb/main.c:1345
#15 0x00005555568bdcbe in main (argc=10, argv=0x7fffffffdba8) at /home/simark/src/binutils-gdb/gdb/gdb.c:32
Here, target_auxv_search is called on the inferior's target stack. The
target stack only contains the exec target, so the query returns empty
auxv data. This gets cached for that inferior in `auxv_inferior_data`.
In its constructor (before it is pushed to the inferior's target stack),
the core_target needs to identify the right target description from the
core, and for that asks the gdbarch to read a target description from
the core file. Because some implementations of
gdbarch_core_read_description (such as AArch64's) need to read auxv data
from the core in order to determine the right target description, the
core_target passes a pointer to itself, allowing implementations to call
target_auxv_search it. However, because we have previously cached
(empty) auxv data for that inferior, target_auxv_search searched that
cached (empty) auxv data, not auxv data read from the core. Remember
that this data was obtained by reading auxv on the inferior's target
stack, which only contained an exec target.
The problem I see is that while target_auxv_search offers the
flexibility of reading from an arbitrary (passed as an argument) target,
the caching doesn't do the distinction of which target is being queried,
and where the cached data came from. So, you could read auxv from a
target A, it gets cached, then you try to read auxv from a target B, and
it returns the cached data from target A. That sounds wrong. In our
case, we expect to read different auxv data from the core target than
what we have read from the target stack earlier, so it doesn't make
sense to hit the cache in this case.
To fix this, I propose splitting the code paths that read auxv data from
an inferior's target stack and those that read from a passed-in target.
The code path that reads from the target stack will keep caching,
whereas the one that reads from a passed-in target won't. And since,
searching in auxv data is independent from where this data came from,
split the "read" part from the "search" part.
From what I understand, auxv caching was introduced mostly to reduce
latency on remote connections, when doing many queries. With the change
I propose, only the queries done while constructing the core_target
end up not using cached auxv data. This is fine, because there are just
a handful of queries max, done at this point, and reading core files is
local.
The changes to auxv functions are:
- Introduce 2 target_read_auxv functions. One reads from an explicit
target_ops and doesn't do caching (to be used in
gdbarch_core_read_description context). The other takes no argument,
reads from the current inferior's target stack (it looks just like a
standard target function wrapper) and does caching.
The first target_read_auxv actually replaces get_auxv_inferior_data,
since it became a trivial wrapper around it.
- Change the existing target_auxv_search to not read auxv data from the
target, but to accept it as a parameter (a gdb::byte_vector). This
function doesn't care where the data came from, it just searches in
it. It still needs to take a target_ops and gdbarch to know how to
parse auxv entries.
- Add a convenience target_auxv_search overload that reads auxv
data from the inferior's target stack and searches in it. This
overload is useful to replace the exist target_auxv_search calls that
passed the `current_inferior ()->top_target ()` target and keep the
call sites short.
- Modify parse_auxv to accept a target_ops and gdbarch to use for
parsing entries. Not strictly related to the rest of this change,
but it seems like a good change in the context.
Changes in architecture-specific files (tdep and nat):
- In linux-tdep, linux_get_hwcap and linux_get_hwcap2 get split in two,
similar to target_auxv_search. One version receives auxv data,
target and arch as parameters. The other gets everything from the
current inferior. The latter is for convenience, to avoid making
call sites too ugly.
- Call sites of linux_get_hwcap and linux_get_hwcap2 are adjusted to
use either of the new versions. The call sites in
gdbarch_core_read_description context explicitly read auxv data from
the passed-in target and call the linux_get_hwcap{,2} function with
parameters. Other call sites use the versions without parameters.
- Same idea for arm_fbsd_read_description_auxv.
- Call sites of target_auxv_search that passed
`current_inferior ()->top_target ()` are changed to use the
target_auxv_search overload that works in the current inferior.
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Reviewed-By: Luis Machado <luis.machado@arm.com>
Change-Id: Ib775a220cf1e76443fb7da2fdff8fc631128fe66
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When the inferior program changes the SVE length, GDB can stop tracking
some registers as it obtains the new gdbarch that corresponds to the
updated length:
Breakpoint 1, do_sve_ioctl_test () at sve-ioctls.c:44
44 res = prctl(PR_SVE_SET_VL, i, 0, 0, 0, 0);
(gdb) print i
$2 = 32
(gdb) info registers
â‹®
[ snip registers x0 to x30 ]
â‹®
sp 0xffffffffeff0 0xffffffffeff0
pc 0xaaaaaaaaa8ac 0xaaaaaaaaa8ac <do_sve_ioctl_test+112>
cpsr 0x60000000 [ EL=0 BTYPE=0 C Z ]
fpsr 0x0 0
fpcr 0x0 0
vg 0x8 8
tpidr 0xfffff7fcb320 0xfffff7fcb320
(gdb) next
45 if (res < 0) {
(gdb) info registers
â‹®
[ snip registers x0 to x30 ]
â‹®
sp 0xffffffffeff0 0xffffffffeff0
pc 0xaaaaaaaaa8cc 0xaaaaaaaaa8cc <do_sve_ioctl_test+144>
cpsr 0x200000 [ EL=0 BTYPE=0 SS ]
fpsr 0x0 0
fpcr 0x0 0
vg 0x4 4
(gdb)
Notice that register tpidr disappeared when vg (which holds the vector
length) changed from 8 to 4. The tpidr register is provided by the
org.gnu.gdb.aarch64.tls feature.
This happens because the code that searches for a new gdbarch to match the
new vector length in aarch64_linux_nat_target::thread_architecture doesn't
take into account the features present in the target description associated
with the previous gdbarch. This patch makes it do that.
Since the id member of struct gdbarch_info is now unused, it's removed.
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I built GDB for all targets on a x86-64/GNU-Linux system, and
then (accidentally) passed GDB a RISC-V binary, and asked GDB to "run"
the binary on the native target. I got this error:
(gdb) show architecture
The target architecture is set to "auto" (currently "i386").
(gdb) file /tmp/hello.rv32.exe
Reading symbols from /tmp/hello.rv32.exe...
(gdb) show architecture
The target architecture is set to "auto" (currently "riscv:rv32").
(gdb) run
Starting program: /tmp/hello.rv32.exe
../../src/gdb/i387-tdep.c:596: internal-error: i387_supply_fxsave: Assertion `tdep->st0_regnum >= I386_ST0_REGNUM' failed.
What's going on here is this; initially the architecture is i386, this
is based on the default architecture, which is set based on the native
target. After loading the RISC-V executable the architecture of the
current inferior is updated based on the architecture of the
executable.
When we "run", GDB does a fork & exec, with the inferior being
controlled through ptrace. GDB sees an initial stop from the inferior
as soon as the inferior comes to life. In response to this stop GDB
ends up calling save_stop_reason (linux-nat.c), which ends up trying
to read register from the inferior, to do this we end up calling
target_ops::fetch_registers, which, for the x86-64 native target,
calls amd64_linux_nat_target::fetch_registers.
After this I eventually end up in i387_supply_fxsave, different x86
based targets will end in different functions to fetch registers, but
it doesn't really matter which function we end up in, the problem is
this line, which is repeated in many places:
i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (arch);
The problem here is that the ARCH in this line comes from the current
inferior, which, as we discussed above, will be a RISC-V gdbarch, the
tdep field will actually be of type riscv_gdbarch_tdep, not
i386_gdbarch_tdep. After this cast we are relying on undefined
behaviour, in my case I happen to trigger an assert, but this might
not always be the case.
The thing I tried that exposed this problem was of course, trying to
start an executable of the wrong architecture on a native target. I
don't think that the correct solution for this problem is to detect,
at the point of cast, that the gdbarch_tdep object is of the wrong
type, but, I did wonder, is there a way that we could protect
ourselves from incorrectly casting the gdbarch_tdep object?
I think that there is something we can do here, and this commit is the
first step in that direction, though no actual check is added by this
commit.
This commit can be split into two parts:
(1) In gdbarch.h and arch-utils.c. In these files I have modified
gdbarch_tdep (the function) so that it now takes a template argument,
like this:
template<typename TDepType>
static inline TDepType *
gdbarch_tdep (struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep_1 (gdbarch);
return static_cast<TDepType *> (tdep);
}
After this change we are no better protected, but the cast is now
done within the gdbarch_tdep function rather than at the call sites,
this leads to the second, much larger change in this commit,
(2) Everywhere gdbarch_tdep is called, we make changes like this:
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (arch);
+ i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (arch);
There should be no functional change after this commit.
In the next commit I will build on this change to add an assertion in
gdbarch_tdep that checks we are casting to the correct type.
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GDB's ability to run 32-bit ARM processes on an AArch64 native target
is currently broken. The test gdb.multi/multi-arch.exp currently
fails with a timeout.
The cause of these problems is the following three functions:
aarch64_linux_nat_target::thread_architecture
aarch64_linux_nat_target::fetch_registers
aarch64_linux_nat_target::store_registers
What has happened, over time, is that these functions have been
modified, forgetting that any particular thread (running on the native
target) might be an ARM thread, or might be an AArch64 thread.
The problems always start with a line similar to this:
aarch64_gdbarch_tdep *tdep
= (aarch64_gdbarch_tdep *) gdbarch_tdep (inf->gdbarch);
The problem with this line is that if 'inf->gdbarch' is an ARM
architecture, then gdbarch_tdep will return a pointer to an
arm_gdbarch_tdep object, not an aarch64_gdbarch_tdep object. The
result of the above cast will, as a consequence, be undefined.
In aarch64_linux_nat_target::thread_architecture, after the undefined
cast we then proceed to make use of TDEP, like this:
if (vq == tdep->vq)
return inf->gdbarch;
Obviously at this point the result is undefined, but, if this check
returns false we then proceed with this code:
struct gdbarch_info info;
info.bfd_arch_info = bfd_lookup_arch (bfd_arch_aarch64, bfd_mach_aarch64);
info.id = (int *) (vq == 0 ? -1 : vq);
return gdbarch_find_by_info (info);
As a consequence we will return an AArch64 gdbarch object for our ARM
thread! Things go downhill from there on.
There are similar problems, with similar undefined behaviour, in the
fetch_registers and store_registers functions.
The solution is to make use of a check like this:
if (gdbarch_bfd_arch_info (inf->gdbarch)->bits_per_word == 32)
If the word size is 32 then we know we have an ARM architecture. We
just need to make sure that we perform this check before trying to
read the tdep field.
In aarch64_linux_nat_target::thread_architecture a little reordering,
and the addition of the above check allows us to easily avoid the
undefined behaviour.
For fetch_registers and store_registers I made the decision to split
each of the functions into two new helper functions, and so
aarch64_linux_nat_target::fetch_registers now calls to either
aarch64_fetch_registers or aarch32_fetch_registers, and there's a
similar change for store_registers.
One thing I had to decide was whether to place the new aarch32_*
functions into the aarch32-linux-nat.c file. In the end I decided to
NOT place the functions there, but instead leave them in
aarch64-linux-nat.c, my reasoning was this:
The existing functions in that file are shared from arm-linux-nat.c
and aarch64-linux-nat.c, this generic code to support 32-bit ARM
debugging from either native target.
In contrast, the two new aarch32 functions I have added _only_ make
sense when debugging on an AArch64 native target. These function
shouldn't be called from arm-linux-nat.c at all, and so, if we places
the functions into aarch32-linux-nat.c, the functions would be built
into a 32-bit ARM GDB, but never used.
With that said, there's no technical reason why they couldn't go in
aarch32-linux-nat.c, so if that is preferred I'm happy to move them.
After this commit the gdb.multi/multi-arch.exp passes.
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I ran into this error while working on AArch64 GDB:
Unable to fetch VFP registers.: Invalid argument.
Notice the '.:' in the middle of this error message.
This is because of this call in aarch64-linux-nat.c:
perror_with_name (_("Unable to fetch VFP registers."));
The perror_with_name function take a string, and adds ': <message>' to
the end the string, so I don't think the string that we pass to
perror_with_name should end in '.'.
This commit removes all of the trailing '.' characters from
perror_with_name calls, which give more readable error messages.
I don't believe that any of these errors are tested in the
testsuite (after a little grepping).
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Replace the sve bool member of aarch64_features with a vq member that
holds the vector quotient. It is zero if SVE is not present.
Add std::hash<> specialization and operator== so that aarch64_features
can be used as a key with std::unordered_map<>.
Change the various functions that create or lookup aarch64 target
descriptions to accept a const aarch64_features object rather than a
growing number of arguments.
Replace the multi-dimension tdesc_aarch64_list arrays used to cache
target descriptions with unordered_maps indexed by aarch64_feature.
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This class includes platform-independent target methods for hardware
breakpoints and watchpoints using routines from
nat/aarch64-hw-point.c.
stopped_data_address is not platform-independent since the FAR
register holding the address for a breakpoint hit must be fetched in a
platform-specific manner. However, aarch64_stopped_data_address is
provided as a helper routine which performs platform-independent
validation given the value of the FAR register.
For tracking the per-process debug register mirror state, use an
unordered_map indexed by pid as recently adopted in x86-nat.c rather
than a manual linked-list.
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Move non-Linux-specific support for hardware break/watchpoints from
nat/aarch64-linux-hw-point.c to nat/aarch64-hw-point.c. Changes
beyond a simple split of the code are:
- aarch64_linux_region_ok_for_watchpoint and
aarch64_linux_any_set_debug_regs_state renamed to drop linux_ as
they are not platform specific.
- Platforms must implement the aarch64_notify_debug_reg_change
function which is invoked from the platform-independent code when a
debug register changes for a given debug register state. This does
not use the indirection of a 'low' structure as is done for x86.
- The handling for kernel_supports_any_contiguous_range is not
pristine. For non-Linux it is simply defined to true. Some uses of
this could perhaps be implemented as new 'low' routines for the
various places that check it instead?
- Pass down ptid into aarch64_handle_breakpoint and
aarch64_handle_watchpoint rather than using current_lwp_ptid which
is only defined on Linux. In addition, pass the ptid on to
aarch64_notify_debug_reg_change instead of the unused state
argument.
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This commit brings all the changes made by running gdb/copyright.py
as per GDB's Start of New Year Procedure.
For the avoidance of doubt, all changes in this commits were
performed by the script.
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While working on a later patch that required me to understand how GDB
starts up inferiors, I was confused by the
target_ops::post_startup_inferior method.
The post_startup_inferior target function is only called from
inf_ptrace_target::create_inferior.
Part of the target class hierarchy looks like this:
inf_child_target
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'-- inf_ptrace_target
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|-- linux_nat_target
|
|-- fbsd_nat_target
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|-- nbsd_nat_target
|
|-- obsd_nat_target
|
'-- rs6000_nat_target
Every sub-class of inf_ptrace_target, except rs6000_nat_target,
implements ::post_startup_inferior. The rs6000_nat_target picks up
the implementation of ::post_startup_inferior not from
inf_ptrace_target, but from inf_child_target.
No descendent of inf_child_target, outside the inf_ptrace_target
sub-tree, implements ::post_startup_inferior, which isn't really
surprising, as they would never see the method called (remember, the
method is only called from inf_ptrace_target::create_inferior).
What I find confusing is the role inf_child_target plays in
implementing, what is really a helper function for just one of its
descendents.
In this commit I propose that we formally make ::post_startup_inferior
a helper function of inf_ptrace_target. To do this I will remove the
::post_startup_inferior from the target_ops API, and instead make this
a protected, pure virtual function on inf_ptrace_target.
I'll remove the empty implementation of ::post_startup_inferior from
the inf_child_target class, and add a new empty implementation to the
rs6000_nat_target class.
All the other descendents of inf_ptrace_target already provide an
implementation of this method and so don't need to change beyond
making the method protected within their class declarations.
To me, this makes much more sense now. The helper function, which is
only called from within the inf_ptrace_target class, is now a part of
the inf_ptrace_target class.
The only way in which this change is visible to a user is if the user
turns on 'set debug target 1'. With this debug flag on, prior to this
patch the user would see something like:
-> native->post_startup_inferior (...)
<- native->post_startup_inferior (2588939)
After this patch these lines are no longer present, as the
post_startup_inferior is no longer a top level target method. For me,
this is an acceptable change.
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Commit 345bd07cce33 ("gdb: fix gdbarch_tdep ODR violation") forgot to
update the gdbarch_tdep calls in the native files other than x86-64
Linux. This patch updates them all (to the best of my knowledge).
These are the files I was able to build-test:
aarch64-linux-nat.c
amd64-bsd-nat.c
arm-linux-nat.c
ppc-linux-nat.c
windows-nat.c
xtensa-linux-nat.c
And these are the ones I could not build-test:
aix-thread.c
arm-netbsd-nat.c
ppc-fbsd-nat.c
ppc-netbsd-nat.c
ia64-tdep.c (the part that needs libunwind)
ppc-obsd-nat.c
rs6000-nat.c
If there are still some build problems related to gdbarch_tdep in them,
they should be pretty obvious to fix.
Change-Id: Iaa3d791a850e4432973757598e634e3da6061428
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While reviewing another patch, I realized that gdbarch_info_init could
easily be removed in favor of initializing gdbarch_info fields directly
in the struct declaration. The only odd part is the union. I don't
know if it's actually important for it to be zero-initialized, but I
presume it is. I added a constructor to gdbarch_info to take care of
that. A proper solution would be to use std::variant. Or, these could
also be separate fields, the little extra space required wouldn't
matter.
gdb/ChangeLog:
* gdbarch.sh (struct gdbarch_info): Initialize fields, add
constructor.
* gdbarch.h: Re-generate.
* arch-utils.h (gdbarch_info_init): Remove, delete all usages.
* arch-utils.c (gdbarch_info_init): Remove.
Change-Id: I7502e08fe0f278d84eef1667a072e8a97bda5ab5
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In a linux kernel mailing list discussion, it was mentioned that "gdb has
this odd thing where it takes the 64-bit vs 32-bit data for the whole process
from one thread, and picks the worst possible thread to do it (ie explicitly
not even the main thread, ...)" [1].
The picking of the thread is done here in
x86_linux_nat_target::read_description:
...
/* GNU/Linux LWP ID's are process ID's. */
tid = inferior_ptid.lwp ();
if (tid == 0)
tid = inferior_ptid.pid (); /* Not a threaded program. */
...
To understand what this code does, let's investigate a scenario in which
inferior_ptid.lwp () != inferior_ptid.pid ().
Say we start exec jit-attach-pie, identified with pid x. The main thread
starts another thread that sleeps, and then the main thread waits for the
sleeping thread. So we have two threads, identified with LWP IDs x and x+1:
...
PID LWP CMD
x x ./jit-attach-pie
x x+1 ./jit-attach-pie
...
[ The thread with LWP x is known as the thread group leader. ]
When attaching to this exec using the pid, gdb does a stop_all_threads which
iterates over all the threads, first LWP x, and then LWP x+1.
So the state we arrive with at x86_linux_nat_target::read_description is:
...
(gdb) p inferior_ptid
$1 = {m_pid = x, m_lwp = x+1, m_tid = 0}
...
and consequently we probe 64/32-bitness from thread LWP x+1.
[ Note that this is different from when gdb doesn't attach but instead
launches the exec itself, in which case there's just one thread to begin with,
and consequently the probed thread is LWP x. ]
According to aforementioned remark, a better choice would have been the main
thread, that is, LWP x.
This patch implement that choice, by simply doing:
...
tid = inferior_ptid.pid ();
...
The fact that gdb makes a per-process permanent choice for 64/32-bitness is a
problem in itself: each thread can be in either 64 or 32 bit mode, and change
forth and back. That is a problem that this patch doesn't fix.
Now finally: why does this matter in the context of the linux kernel
discussion? The discussion was related to a patch that exposed io_uring
threads to user-space. This made it possible that one of those threads would
be picked out to select 64/32-bitness. Given that such threads are atypical
user-space threads in the sense that they don't return to user-space and don't
have a userspace register state, reading their registers returns garbage, and
so it could f.i. occur that in a 64-bit process with all normal user-space
threads in 64-bit mode, the probing would return 32-bit.
It may be that this is worked-around on the kernel side by providing userspace
register state in those threads such that current gdb is happy. Nevertheless,
it seems prudent to fix this on the gdb size as well.
Tested on x86_64-linux.
[1] https://lore.kernel.org/io-uring/CAHk-=wh0KoEZXPYMGkfkeVEerSCEF1AiCZSvz9TRrx=Kj74D+Q@mail.gmail.com/
gdb/ChangeLog:
2021-05-23 Tom de Vries <tdevries@suse.de>
PR tdep/27822
* target.h (struct target_ops): Mention target_thread_architecture in
read_description comment.
* x86-linux-nat.c (x86_linux_nat_target::read_description): Use
pid to determine if process is 64-bit or 32-bit.
* aarch64-linux-nat.c (aarch64_linux_nat_target::read_description):
Same.
* ppc-linux-nat.c (ppc_linux_nat_target::read_description): Same.
* riscv-linux-nat.c (riscv_linux_nat_target::read_description): Same.
* s390-linux-nat.c (s390_linux_nat_target::read_description): Same.
* arm-linux-nat.c (arm_linux_nat_target::read_description): Same.
Likewise, use pid to determine if kernel supports reading VFP
registers.
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The patch implements the memory tagging target hooks for AArch64, so we
can handle MTE.
gdb/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* Makefile.in (ALL_64_TARGET_OBS): Add arch/aarch64-mte-linux.o.
(HFILES_NO_SRCDIR): Add arch/aarch64-mte-linux.h and
nat/aarch64-mte-linux-ptrace.h.
* aarch64-linux-nat.c: Include nat/aarch64-mte-linux-ptrace.h.
(aarch64_linux_nat_target) <supports_memory_tagging>: New method
override.
<fetch_memtags>: New method override.
<store_memtags>: New method override.
(aarch64_linux_nat_target::supports_memory_tagging): New method.
(aarch64_linux_nat_target::fetch_memtags): New method.
(aarch64_linux_nat_target::store_memtags): New method.
* arch/aarch64-mte-linux.c: New file.
* arch/aarch64-mte-linux.h: Include gdbsupport/common-defs.h.
(AARCH64_MTE_GRANULE_SIZE): Define.
(aarch64_memtag_type): New enum.
(aarch64_mte_get_tag_granules): New prototype.
* configure.nat (NATDEPFILES): Add nat/aarch64-mte-linux-ptrace.o.
* configure.tgt (aarch64*-*-linux*): Add arch/aarch64-mte-linux.o.
* nat/aarch64-mte-linux-ptrace.c: New file.
* nat/aarch64-mte-linux-ptrace.h: New file.
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AArch64 MTE support in the Linux kernel exposes a new register
through ptrace. This patch adds the required code to support it.
include/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* elf/common.h (NT_ARM_TAGGED_ADDR_CTRL): Define.
gdb/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* aarch64-linux-nat.c (fetch_mteregs_from_thread): New function.
(store_mteregs_to_thread): New function.
(aarch64_linux_nat_target::fetch_registers): Update to call
fetch_mteregs_from_thread.
(aarch64_linux_nat_target::store_registers): Update to call
store_mteregs_to_thread.
* aarch64-tdep.c (aarch64_mte_register_names): New struct.
(aarch64_cannot_store_register): Handle MTE registers.
(aarch64_gdbarch_init): Initialize and setup MTE registers.
* aarch64-tdep.h (gdbarch_tdep) <mte_reg_base>: New field.
<has_mte>: New method.
* arch/aarch64-linux.h (AARCH64_LINUX_SIZEOF_MTE): Define.
gdbserver/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* linux-aarch64-low.cc (aarch64_fill_mteregset): New function.
(aarch64_store_mteregset): New function.
(aarch64_regsets): Add MTE register set entry.
(aarch64_sve_regsets): Add MTE register set entry.
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This patch adds a target description and feature "mte" for aarch64.
It includes one new register, tag_ctl, that can be used to configure the
tag generation rules and sync/async modes. It is 64-bit in size.
The patch also adjusts the code that creates the target descriptions at
runtime based on CPU feature checks.
gdb/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* aarch64-linux-nat.c
(aarch64_linux_nat_target::read_description): Take MTE flag into
account.
Slight refactor to hwcap flag checking.
* aarch64-linux-tdep.c
(aarch64_linux_core_read_description): Likewise.
* aarch64-tdep.c (tdesc_aarch64_list): Add one more dimension for
MTE.
(aarch64_read_description): Add mte_p parameter and update to use it.
Update the documentation.
(aarch64_gdbarch_init): Update call to aarch64_read_description.
* aarch64-tdep.h (aarch64_read_description): Add mte_p parameter.
* arch/aarch64.c: Include ../features/aarch64-mte.c.
(aarch64_create_target_description): Add mte_p parameter and update
the code to use it.
* arch/aarch64.h (aarch64_create_target_description): Add mte_p
parameter.
* features/Makefile (FEATURE_XMLFILES): Add aarch64-mte.xml.
* features/aarch64-mte.c: New file, generated.
* features/aarch64-mte.xml: New file.
gdbserver/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* linux-aarch64-ipa.cc (get_ipa_tdesc): Update call to
aarch64_linux_read_description.
(initialize_low_tracepoint): Likewise.
* linux-aarch64-low.cc (aarch64_target::low_arch_setup): Take MTE flag
into account.
* linux-aarch64-tdesc.cc (tdesc_aarch64_list): Add one more dimension
for MTE.
(aarch64_linux_read_description): Add mte_p parameter and update to
use it.
* linux-aarch64-tdesc.h (aarch64_linux_read_description): Add mte_p
parameter.
|
|
This patch is a preparation for the next patches implementing MTE. It just adds
a HWCAP2 constant for MTE, creates a new generic arch/aarch64-mte-linux.h file
and includes that file in the source files that will use it.
gdb/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* Makefile.in (HFILES_NO_SRCDIR): Add arch/aarch64-mte-linux.h.
* aarch64-linux-nat.c: Include arch/aarch64-mte-linux.h.
* aarch64-linux-tdep.c: Likewise
* arch/aarch64-mte-linux.h: New file.
gdbserver/ChangeLog:
2021-03-24 Luis Machado <luis.machado@linaro.org>
* linux-aarch64-low.cc: Include arch/aarch64-mte-linux.h.
|
|
This commits the result of running gdb/copyright.py as per our Start
of New Year procedure...
gdb/ChangeLog
Update copyright year range in copyright header of all GDB files.
|
|
When inserting hw watchpoints, we take care of masking off the top byte
of the address (and sign-extending it if needed). This guarantees we won't
pass tagged addresses to the kernel via ptrace.
However, from the kernel documentation on tagged pointers...
"Non-zero tags are not preserved when delivering signals. This means that
signal handlers in applications making use of tags cannot rely on the tag
information for user virtual addresses being maintained for fields inside
siginfo_t.
One exception to this rule is for signals raised in response to watchpoint
debug exceptions, where the tag information will be preserved."
So the stopped data address after a hw watchpoint hit can be potentially
tagged, and we don't handle this in GDB at the moment. This results in
GDB missing a hw watchpoint hit and attempting to step over an unsteppable
hw watchpoint, causing it to spin endlessly.
The following patch fixes this by adjusting the stopped data address and adds
some tests to expose the problem.
gdb/ChangeLog:
2020-12-16 Luis Machado <luis.machado@linaro.org>
* aarch64-linux-nat.c
(aarch64_linux_nat_target::stopped_data_address): Handle the TBI.
gdbserver/ChangeLog:
2020-12-16 Luis Machado <luis.machado@linaro.org>
* linux-aarch64-low.cc (address_significant): New function.
(aarch64_target::low_stopped_data_address): Handle the TBI.
gdb/testsuite/ChangeLog:
2020-12-16 Luis Machado <luis.machado@linaro.org>
* gdb.arch/aarch64-tagged-pointer.c (main): Add a few more
pointer-based memory accesses.
* gdb.arch/aarch64-tagged-pointer.exp: Exercise additional
hw watchpoint cases.
|
|
I'd like to enable the -Wmissing-declarations warning. However, it
warns for every _initialize function, for example:
CXX dcache.o
/home/smarchi/src/binutils-gdb/gdb/dcache.c: In function ‘void _initialize_dcache()’:
/home/smarchi/src/binutils-gdb/gdb/dcache.c:688:1: error: no previous declaration for ‘void _initialize_dcache()’ [-Werror=missing-declarations]
_initialize_dcache (void)
^~~~~~~~~~~~~~~~~~
The only practical way forward I found is to add back the declarations,
which were removed by this commit:
commit 481695ed5f6e0a8a9c9c50bfac1cdd2b3151e6c9
Author: John Baldwin <jhb@FreeBSD.org>
Date: Sat Sep 9 11:02:37 2017 -0700
Remove unnecessary function prototypes.
I don't think it's a big problem to have the declarations for these
functions, but if anybody has a better solution for this, I'll be happy
to use it.
gdb/ChangeLog:
* aarch64-fbsd-nat.c (_initialize_aarch64_fbsd_nat): Add declaration.
* aarch64-fbsd-tdep.c (_initialize_aarch64_fbsd_tdep): Add declaration.
* aarch64-linux-nat.c (_initialize_aarch64_linux_nat): Add declaration.
* aarch64-linux-tdep.c (_initialize_aarch64_linux_tdep): Add declaration.
* aarch64-newlib-tdep.c (_initialize_aarch64_newlib_tdep): Add declaration.
* aarch64-tdep.c (_initialize_aarch64_tdep): Add declaration.
* ada-exp.y (_initialize_ada_exp): Add declaration.
* ada-lang.c (_initialize_ada_language): Add declaration.
* ada-tasks.c (_initialize_tasks): Add declaration.
* agent.c (_initialize_agent): Add declaration.
* aix-thread.c (_initialize_aix_thread): Add declaration.
* alpha-bsd-nat.c (_initialize_alphabsd_nat): Add declaration.
* alpha-linux-nat.c (_initialize_alpha_linux_nat): Add declaration.
* alpha-linux-tdep.c (_initialize_alpha_linux_tdep): Add declaration.
* alpha-nbsd-tdep.c (_initialize_alphanbsd_tdep): Add declaration.
* alpha-obsd-tdep.c (_initialize_alphaobsd_tdep): Add declaration.
* alpha-tdep.c (_initialize_alpha_tdep): Add declaration.
* amd64-darwin-tdep.c (_initialize_amd64_darwin_tdep): Add declaration.
* amd64-dicos-tdep.c (_initialize_amd64_dicos_tdep): Add declaration.
* amd64-fbsd-nat.c (_initialize_amd64fbsd_nat): Add declaration.
* amd64-fbsd-tdep.c (_initialize_amd64fbsd_tdep): Add declaration.
* amd64-linux-nat.c (_initialize_amd64_linux_nat): Add declaration.
* amd64-linux-tdep.c (_initialize_amd64_linux_tdep): Add declaration.
* amd64-nbsd-nat.c (_initialize_amd64nbsd_nat): Add declaration.
* amd64-nbsd-tdep.c (_initialize_amd64nbsd_tdep): Add declaration.
* amd64-obsd-nat.c (_initialize_amd64obsd_nat): Add declaration.
* amd64-obsd-tdep.c (_initialize_amd64obsd_tdep): Add declaration.
* amd64-sol2-tdep.c (_initialize_amd64_sol2_tdep): Add declaration.
* amd64-tdep.c (_initialize_amd64_tdep): Add declaration.
* amd64-windows-nat.c (_initialize_amd64_windows_nat): Add declaration.
* amd64-windows-tdep.c (_initialize_amd64_windows_tdep): Add declaration.
* annotate.c (_initialize_annotate): Add declaration.
* arc-newlib-tdep.c (_initialize_arc_newlib_tdep): Add declaration.
* arc-tdep.c (_initialize_arc_tdep): Add declaration.
* arch-utils.c (_initialize_gdbarch_utils): Add declaration.
* arm-fbsd-nat.c (_initialize_arm_fbsd_nat): Add declaration.
* arm-fbsd-tdep.c (_initialize_arm_fbsd_tdep): Add declaration.
* arm-linux-nat.c (_initialize_arm_linux_nat): Add declaration.
* arm-linux-tdep.c (_initialize_arm_linux_tdep): Add declaration.
* arm-nbsd-nat.c (_initialize_arm_netbsd_nat): Add declaration.
* arm-nbsd-tdep.c (_initialize_arm_netbsd_tdep): Add declaration.
* arm-obsd-tdep.c (_initialize_armobsd_tdep): Add declaration.
* arm-pikeos-tdep.c (_initialize_arm_pikeos_tdep): Add declaration.
* arm-symbian-tdep.c (_initialize_arm_symbian_tdep): Add declaration.
* arm-tdep.c (_initialize_arm_tdep): Add declaration.
* arm-wince-tdep.c (_initialize_arm_wince_tdep): Add declaration.
* auto-load.c (_initialize_auto_load): Add declaration.
* auxv.c (_initialize_auxv): Add declaration.
* avr-tdep.c (_initialize_avr_tdep): Add declaration.
* ax-gdb.c (_initialize_ax_gdb): Add declaration.
* bfin-linux-tdep.c (_initialize_bfin_linux_tdep): Add declaration.
* bfin-tdep.c (_initialize_bfin_tdep): Add declaration.
* break-catch-sig.c (_initialize_break_catch_sig): Add declaration.
* break-catch-syscall.c (_initialize_break_catch_syscall): Add declaration.
* break-catch-throw.c (_initialize_break_catch_throw): Add declaration.
* breakpoint.c (_initialize_breakpoint): Add declaration.
* bsd-uthread.c (_initialize_bsd_uthread): Add declaration.
* btrace.c (_initialize_btrace): Add declaration.
* charset.c (_initialize_charset): Add declaration.
* cli/cli-cmds.c (_initialize_cli_cmds): Add declaration.
* cli/cli-dump.c (_initialize_cli_dump): Add declaration.
* cli/cli-interp.c (_initialize_cli_interp): Add declaration.
* cli/cli-logging.c (_initialize_cli_logging): Add declaration.
* cli/cli-script.c (_initialize_cli_script): Add declaration.
* cli/cli-style.c (_initialize_cli_style): Add declaration.
* coff-pe-read.c (_initialize_coff_pe_read): Add declaration.
* coffread.c (_initialize_coffread): Add declaration.
* compile/compile-cplus-types.c (_initialize_compile_cplus_types): Add declaration.
* compile/compile.c (_initialize_compile): Add declaration.
* complaints.c (_initialize_complaints): Add declaration.
* completer.c (_initialize_completer): Add declaration.
* copying.c (_initialize_copying): Add declaration.
* corefile.c (_initialize_core): Add declaration.
* corelow.c (_initialize_corelow): Add declaration.
* cp-abi.c (_initialize_cp_abi): Add declaration.
* cp-namespace.c (_initialize_cp_namespace): Add declaration.
* cp-support.c (_initialize_cp_support): Add declaration.
* cp-valprint.c (_initialize_cp_valprint): Add declaration.
* cris-linux-tdep.c (_initialize_cris_linux_tdep): Add declaration.
* cris-tdep.c (_initialize_cris_tdep): Add declaration.
* csky-linux-tdep.c (_initialize_csky_linux_tdep): Add declaration.
* csky-tdep.c (_initialize_csky_tdep): Add declaration.
* ctfread.c (_initialize_ctfread): Add declaration.
* d-lang.c (_initialize_d_language): Add declaration.
* darwin-nat-info.c (_initialize_darwin_info_commands): Add declaration.
* darwin-nat.c (_initialize_darwin_nat): Add declaration.
* dbxread.c (_initialize_dbxread): Add declaration.
* dcache.c (_initialize_dcache): Add declaration.
* disasm-selftests.c (_initialize_disasm_selftests): Add declaration.
* disasm.c (_initialize_disasm): Add declaration.
* dtrace-probe.c (_initialize_dtrace_probe): Add declaration.
* dummy-frame.c (_initialize_dummy_frame): Add declaration.
* dwarf-index-cache.c (_initialize_index_cache): Add declaration.
* dwarf-index-write.c (_initialize_dwarf_index_write): Add declaration.
* dwarf2-frame-tailcall.c (_initialize_tailcall_frame): Add declaration.
* dwarf2-frame.c (_initialize_dwarf2_frame): Add declaration.
* dwarf2expr.c (_initialize_dwarf2expr): Add declaration.
* dwarf2loc.c (_initialize_dwarf2loc): Add declaration.
* dwarf2read.c (_initialize_dwarf2_read): Add declaration.
* elfread.c (_initialize_elfread): Add declaration.
* exec.c (_initialize_exec): Add declaration.
* extension.c (_initialize_extension): Add declaration.
* f-lang.c (_initialize_f_language): Add declaration.
* f-valprint.c (_initialize_f_valprint): Add declaration.
* fbsd-nat.c (_initialize_fbsd_nat): Add declaration.
* fbsd-tdep.c (_initialize_fbsd_tdep): Add declaration.
* filesystem.c (_initialize_filesystem): Add declaration.
* findcmd.c (_initialize_mem_search): Add declaration.
* findvar.c (_initialize_findvar): Add declaration.
* fork-child.c (_initialize_fork_child): Add declaration.
* frame-base.c (_initialize_frame_base): Add declaration.
* frame-unwind.c (_initialize_frame_unwind): Add declaration.
* frame.c (_initialize_frame): Add declaration.
* frv-linux-tdep.c (_initialize_frv_linux_tdep): Add declaration.
* frv-tdep.c (_initialize_frv_tdep): Add declaration.
* ft32-tdep.c (_initialize_ft32_tdep): Add declaration.
* gcore.c (_initialize_gcore): Add declaration.
* gdb-demangle.c (_initialize_gdb_demangle): Add declaration.
* gdb_bfd.c (_initialize_gdb_bfd): Add declaration.
* gdbarch-selftests.c (_initialize_gdbarch_selftests): Add declaration.
* gdbarch.c (_initialize_gdbarch): Add declaration.
* gdbtypes.c (_initialize_gdbtypes): Add declaration.
* gnu-nat.c (_initialize_gnu_nat): Add declaration.
* gnu-v2-abi.c (_initialize_gnu_v2_abi): Add declaration.
* gnu-v3-abi.c (_initialize_gnu_v3_abi): Add declaration.
* go-lang.c (_initialize_go_language): Add declaration.
* go32-nat.c (_initialize_go32_nat): Add declaration.
* guile/guile.c (_initialize_guile): Add declaration.
* h8300-tdep.c (_initialize_h8300_tdep): Add declaration.
* hppa-linux-nat.c (_initialize_hppa_linux_nat): Add declaration.
* hppa-linux-tdep.c (_initialize_hppa_linux_tdep): Add declaration.
* hppa-nbsd-nat.c (_initialize_hppanbsd_nat): Add declaration.
* hppa-nbsd-tdep.c (_initialize_hppanbsd_tdep): Add declaration.
* hppa-obsd-nat.c (_initialize_hppaobsd_nat): Add declaration.
* hppa-obsd-tdep.c (_initialize_hppabsd_tdep): Add declaration.
* hppa-tdep.c (_initialize_hppa_tdep): Add declaration.
* i386-bsd-nat.c (_initialize_i386bsd_nat): Add declaration.
* i386-cygwin-tdep.c (_initialize_i386_cygwin_tdep): Add declaration.
* i386-darwin-nat.c (_initialize_i386_darwin_nat): Add declaration.
* i386-darwin-tdep.c (_initialize_i386_darwin_tdep): Add declaration.
* i386-dicos-tdep.c (_initialize_i386_dicos_tdep): Add declaration.
* i386-fbsd-nat.c (_initialize_i386fbsd_nat): Add declaration.
* i386-fbsd-tdep.c (_initialize_i386fbsd_tdep): Add declaration.
* i386-gnu-nat.c (_initialize_i386gnu_nat): Add declaration.
* i386-gnu-tdep.c (_initialize_i386gnu_tdep): Add declaration.
* i386-go32-tdep.c (_initialize_i386_go32_tdep): Add declaration.
* i386-linux-nat.c (_initialize_i386_linux_nat): Add declaration.
* i386-linux-tdep.c (_initialize_i386_linux_tdep): Add declaration.
* i386-nbsd-nat.c (_initialize_i386nbsd_nat): Add declaration.
* i386-nbsd-tdep.c (_initialize_i386nbsd_tdep): Add declaration.
* i386-nto-tdep.c (_initialize_i386nto_tdep): Add declaration.
* i386-obsd-nat.c (_initialize_i386obsd_nat): Add declaration.
* i386-obsd-tdep.c (_initialize_i386obsd_tdep): Add declaration.
* i386-sol2-nat.c (_initialize_amd64_sol2_nat): Add declaration.
* i386-sol2-tdep.c (_initialize_i386_sol2_tdep): Add declaration.
* i386-tdep.c (_initialize_i386_tdep): Add declaration.
* i386-windows-nat.c (_initialize_i386_windows_nat): Add declaration.
* ia64-libunwind-tdep.c (_initialize_libunwind_frame): Add declaration.
* ia64-linux-nat.c (_initialize_ia64_linux_nat): Add declaration.
* ia64-linux-tdep.c (_initialize_ia64_linux_tdep): Add declaration.
* ia64-tdep.c (_initialize_ia64_tdep): Add declaration.
* ia64-vms-tdep.c (_initialize_ia64_vms_tdep): Add declaration.
* infcall.c (_initialize_infcall): Add declaration.
* infcmd.c (_initialize_infcmd): Add declaration.
* inflow.c (_initialize_inflow): Add declaration.
* infrun.c (_initialize_infrun): Add declaration.
* interps.c (_initialize_interpreter): Add declaration.
* iq2000-tdep.c (_initialize_iq2000_tdep): Add declaration.
* jit.c (_initialize_jit): Add declaration.
* language.c (_initialize_language): Add declaration.
* linux-fork.c (_initialize_linux_fork): Add declaration.
* linux-nat.c (_initialize_linux_nat): Add declaration.
* linux-tdep.c (_initialize_linux_tdep): Add declaration.
* linux-thread-db.c (_initialize_thread_db): Add declaration.
* lm32-tdep.c (_initialize_lm32_tdep): Add declaration.
* m2-lang.c (_initialize_m2_language): Add declaration.
* m32c-tdep.c (_initialize_m32c_tdep): Add declaration.
* m32r-linux-nat.c (_initialize_m32r_linux_nat): Add declaration.
* m32r-linux-tdep.c (_initialize_m32r_linux_tdep): Add declaration.
* m32r-tdep.c (_initialize_m32r_tdep): Add declaration.
* m68hc11-tdep.c (_initialize_m68hc11_tdep): Add declaration.
* m68k-bsd-nat.c (_initialize_m68kbsd_nat): Add declaration.
* m68k-bsd-tdep.c (_initialize_m68kbsd_tdep): Add declaration.
* m68k-linux-nat.c (_initialize_m68k_linux_nat): Add declaration.
* m68k-linux-tdep.c (_initialize_m68k_linux_tdep): Add declaration.
* m68k-tdep.c (_initialize_m68k_tdep): Add declaration.
* machoread.c (_initialize_machoread): Add declaration.
* macrocmd.c (_initialize_macrocmd): Add declaration.
* macroscope.c (_initialize_macroscope): Add declaration.
* maint-test-options.c (_initialize_maint_test_options): Add declaration.
* maint-test-settings.c (_initialize_maint_test_settings): Add declaration.
* maint.c (_initialize_maint_cmds): Add declaration.
* mdebugread.c (_initialize_mdebugread): Add declaration.
* memattr.c (_initialize_mem): Add declaration.
* mep-tdep.c (_initialize_mep_tdep): Add declaration.
* mi/mi-cmd-env.c (_initialize_mi_cmd_env): Add declaration.
* mi/mi-cmds.c (_initialize_mi_cmds): Add declaration.
* mi/mi-interp.c (_initialize_mi_interp): Add declaration.
* mi/mi-main.c (_initialize_mi_main): Add declaration.
* microblaze-linux-tdep.c (_initialize_microblaze_linux_tdep): Add declaration.
* microblaze-tdep.c (_initialize_microblaze_tdep): Add declaration.
* mips-fbsd-nat.c (_initialize_mips_fbsd_nat): Add declaration.
* mips-fbsd-tdep.c (_initialize_mips_fbsd_tdep): Add declaration.
* mips-linux-nat.c (_initialize_mips_linux_nat): Add declaration.
* mips-linux-tdep.c (_initialize_mips_linux_tdep): Add declaration.
* mips-nbsd-nat.c (_initialize_mipsnbsd_nat): Add declaration.
* mips-nbsd-tdep.c (_initialize_mipsnbsd_tdep): Add declaration.
* mips-sde-tdep.c (_initialize_mips_sde_tdep): Add declaration.
* mips-tdep.c (_initialize_mips_tdep): Add declaration.
* mips64-obsd-nat.c (_initialize_mips64obsd_nat): Add declaration.
* mips64-obsd-tdep.c (_initialize_mips64obsd_tdep): Add declaration.
* mipsread.c (_initialize_mipsread): Add declaration.
* mn10300-linux-tdep.c (_initialize_mn10300_linux_tdep): Add declaration.
* mn10300-tdep.c (_initialize_mn10300_tdep): Add declaration.
* moxie-tdep.c (_initialize_moxie_tdep): Add declaration.
* msp430-tdep.c (_initialize_msp430_tdep): Add declaration.
* nds32-tdep.c (_initialize_nds32_tdep): Add declaration.
* nios2-linux-tdep.c (_initialize_nios2_linux_tdep): Add declaration.
* nios2-tdep.c (_initialize_nios2_tdep): Add declaration.
* nto-procfs.c (_initialize_procfs): Add declaration.
* objc-lang.c (_initialize_objc_language): Add declaration.
* observable.c (_initialize_observer): Add declaration.
* opencl-lang.c (_initialize_opencl_language): Add declaration.
* or1k-linux-tdep.c (_initialize_or1k_linux_tdep): Add declaration.
* or1k-tdep.c (_initialize_or1k_tdep): Add declaration.
* osabi.c (_initialize_gdb_osabi): Add declaration.
* osdata.c (_initialize_osdata): Add declaration.
* p-valprint.c (_initialize_pascal_valprint): Add declaration.
* parse.c (_initialize_parse): Add declaration.
* ppc-fbsd-nat.c (_initialize_ppcfbsd_nat): Add declaration.
* ppc-fbsd-tdep.c (_initialize_ppcfbsd_tdep): Add declaration.
* ppc-linux-nat.c (_initialize_ppc_linux_nat): Add declaration.
* ppc-linux-tdep.c (_initialize_ppc_linux_tdep): Add declaration.
* ppc-nbsd-nat.c (_initialize_ppcnbsd_nat): Add declaration.
* ppc-nbsd-tdep.c (_initialize_ppcnbsd_tdep): Add declaration.
* ppc-obsd-nat.c (_initialize_ppcobsd_nat): Add declaration.
* ppc-obsd-tdep.c (_initialize_ppcobsd_tdep): Add declaration.
* printcmd.c (_initialize_printcmd): Add declaration.
* probe.c (_initialize_probe): Add declaration.
* proc-api.c (_initialize_proc_api): Add declaration.
* proc-events.c (_initialize_proc_events): Add declaration.
* proc-service.c (_initialize_proc_service): Add declaration.
* procfs.c (_initialize_procfs): Add declaration.
* producer.c (_initialize_producer): Add declaration.
* psymtab.c (_initialize_psymtab): Add declaration.
* python/python.c (_initialize_python): Add declaration.
* ravenscar-thread.c (_initialize_ravenscar): Add declaration.
* record-btrace.c (_initialize_record_btrace): Add declaration.
* record-full.c (_initialize_record_full): Add declaration.
* record.c (_initialize_record): Add declaration.
* regcache-dump.c (_initialize_regcache_dump): Add declaration.
* regcache.c (_initialize_regcache): Add declaration.
* reggroups.c (_initialize_reggroup): Add declaration.
* remote-notif.c (_initialize_notif): Add declaration.
* remote-sim.c (_initialize_remote_sim): Add declaration.
* remote.c (_initialize_remote): Add declaration.
* reverse.c (_initialize_reverse): Add declaration.
* riscv-fbsd-nat.c (_initialize_riscv_fbsd_nat): Add declaration.
* riscv-fbsd-tdep.c (_initialize_riscv_fbsd_tdep): Add declaration.
* riscv-linux-nat.c (_initialize_riscv_linux_nat): Add declaration.
* riscv-linux-tdep.c (_initialize_riscv_linux_tdep): Add declaration.
* riscv-tdep.c (_initialize_riscv_tdep): Add declaration.
* rl78-tdep.c (_initialize_rl78_tdep): Add declaration.
* rs6000-aix-tdep.c (_initialize_rs6000_aix_tdep): Add declaration.
* rs6000-lynx178-tdep.c (_initialize_rs6000_lynx178_tdep):
Add declaration.
* rs6000-nat.c (_initialize_rs6000_nat): Add declaration.
* rs6000-tdep.c (_initialize_rs6000_tdep): Add declaration.
* run-on-main-thread.c (_initialize_run_on_main_thread): Add declaration.
* rust-exp.y (_initialize_rust_exp): Add declaration.
* rx-tdep.c (_initialize_rx_tdep): Add declaration.
* s12z-tdep.c (_initialize_s12z_tdep): Add declaration.
* s390-linux-nat.c (_initialize_s390_nat): Add declaration.
* s390-linux-tdep.c (_initialize_s390_linux_tdep): Add declaration.
* s390-tdep.c (_initialize_s390_tdep): Add declaration.
* score-tdep.c (_initialize_score_tdep): Add declaration.
* ser-go32.c (_initialize_ser_dos): Add declaration.
* ser-mingw.c (_initialize_ser_windows): Add declaration.
* ser-pipe.c (_initialize_ser_pipe): Add declaration.
* ser-tcp.c (_initialize_ser_tcp): Add declaration.
* ser-uds.c (_initialize_ser_socket): Add declaration.
* ser-unix.c (_initialize_ser_hardwire): Add declaration.
* serial.c (_initialize_serial): Add declaration.
* sh-linux-tdep.c (_initialize_sh_linux_tdep): Add declaration.
* sh-nbsd-nat.c (_initialize_shnbsd_nat): Add declaration.
* sh-nbsd-tdep.c (_initialize_shnbsd_tdep): Add declaration.
* sh-tdep.c (_initialize_sh_tdep): Add declaration.
* skip.c (_initialize_step_skip): Add declaration.
* sol-thread.c (_initialize_sol_thread): Add declaration.
* solib-aix.c (_initialize_solib_aix): Add declaration.
* solib-darwin.c (_initialize_darwin_solib): Add declaration.
* solib-dsbt.c (_initialize_dsbt_solib): Add declaration.
* solib-frv.c (_initialize_frv_solib): Add declaration.
* solib-svr4.c (_initialize_svr4_solib): Add declaration.
* solib-target.c (_initialize_solib_target): Add declaration.
* solib.c (_initialize_solib): Add declaration.
* source-cache.c (_initialize_source_cache): Add declaration.
* source.c (_initialize_source): Add declaration.
* sparc-linux-nat.c (_initialize_sparc_linux_nat): Add declaration.
* sparc-linux-tdep.c (_initialize_sparc_linux_tdep): Add declaration.
* sparc-nat.c (_initialize_sparc_nat): Add declaration.
* sparc-nbsd-nat.c (_initialize_sparcnbsd_nat): Add declaration.
* sparc-nbsd-tdep.c (_initialize_sparcnbsd_tdep): Add declaration.
* sparc-obsd-tdep.c (_initialize_sparc32obsd_tdep): Add declaration.
* sparc-sol2-tdep.c (_initialize_sparc_sol2_tdep): Add declaration.
* sparc-tdep.c (_initialize_sparc_tdep): Add declaration.
* sparc64-fbsd-nat.c (_initialize_sparc64fbsd_nat): Add declaration.
* sparc64-fbsd-tdep.c (_initialize_sparc64fbsd_tdep): Add declaration.
* sparc64-linux-nat.c (_initialize_sparc64_linux_nat): Add declaration.
* sparc64-linux-tdep.c (_initialize_sparc64_linux_tdep): Add declaration.
* sparc64-nat.c (_initialize_sparc64_nat): Add declaration.
* sparc64-nbsd-nat.c (_initialize_sparc64nbsd_nat): Add declaration.
* sparc64-nbsd-tdep.c (_initialize_sparc64nbsd_tdep): Add declaration.
* sparc64-obsd-nat.c (_initialize_sparc64obsd_nat): Add declaration.
* sparc64-obsd-tdep.c (_initialize_sparc64obsd_tdep): Add declaration.
* sparc64-sol2-tdep.c (_initialize_sparc64_sol2_tdep): Add declaration.
* sparc64-tdep.c (_initialize_sparc64_adi_tdep): Add declaration.
* stabsread.c (_initialize_stabsread): Add declaration.
* stack.c (_initialize_stack): Add declaration.
* stap-probe.c (_initialize_stap_probe): Add declaration.
* std-regs.c (_initialize_frame_reg): Add declaration.
* symfile-debug.c (_initialize_symfile_debug): Add declaration.
* symfile-mem.c (_initialize_symfile_mem): Add declaration.
* symfile.c (_initialize_symfile): Add declaration.
* symmisc.c (_initialize_symmisc): Add declaration.
* symtab.c (_initialize_symtab): Add declaration.
* target.c (_initialize_target): Add declaration.
* target-connection.c (_initialize_target_connection): Add
declaration.
* target-dcache.c (_initialize_target_dcache): Add declaration.
* target-descriptions.c (_initialize_target_descriptions): Add declaration.
* thread.c (_initialize_thread): Add declaration.
* tic6x-linux-tdep.c (_initialize_tic6x_linux_tdep): Add declaration.
* tic6x-tdep.c (_initialize_tic6x_tdep): Add declaration.
* tilegx-linux-nat.c (_initialize_tile_linux_nat): Add declaration.
* tilegx-linux-tdep.c (_initialize_tilegx_linux_tdep): Add declaration.
* tilegx-tdep.c (_initialize_tilegx_tdep): Add declaration.
* tracectf.c (_initialize_ctf): Add declaration.
* tracefile-tfile.c (_initialize_tracefile_tfile): Add declaration.
* tracefile.c (_initialize_tracefile): Add declaration.
* tracepoint.c (_initialize_tracepoint): Add declaration.
* tui/tui-hooks.c (_initialize_tui_hooks): Add declaration.
* tui/tui-interp.c (_initialize_tui_interp): Add declaration.
* tui/tui-layout.c (_initialize_tui_layout): Add declaration.
* tui/tui-regs.c (_initialize_tui_regs): Add declaration.
* tui/tui-stack.c (_initialize_tui_stack): Add declaration.
* tui/tui-win.c (_initialize_tui_win): Add declaration.
* tui/tui.c (_initialize_tui): Add declaration.
* typeprint.c (_initialize_typeprint): Add declaration.
* ui-style.c (_initialize_ui_style): Add declaration.
* unittests/array-view-selftests.c (_initialize_array_view_selftests): Add declaration.
* unittests/child-path-selftests.c (_initialize_child_path_selftests): Add declaration.
* unittests/cli-utils-selftests.c (_initialize_cli_utils_selftests): Add declaration.
* unittests/common-utils-selftests.c (_initialize_common_utils_selftests): Add declaration.
* unittests/copy_bitwise-selftests.c (_initialize_copy_bitwise_utils_selftests): Add declaration.
* unittests/environ-selftests.c (_initialize_environ_selftests): Add declaration.
* unittests/filtered_iterator-selftests.c
(_initialize_filtered_iterator_selftests): Add declaration.
* unittests/format_pieces-selftests.c (_initialize_format_pieces_selftests): Add declaration.
* unittests/function-view-selftests.c (_initialize_function_view_selftests): Add declaration.
* unittests/help-doc-selftests.c (_initialize_help_doc_selftests): Add declaration.
* unittests/lookup_name_info-selftests.c (_initialize_lookup_name_info_selftests): Add declaration.
* unittests/main-thread-selftests.c
(_initialize_main_thread_selftests): Add declaration.
* unittests/memory-map-selftests.c (_initialize_memory_map_selftests): Add declaration.
* unittests/memrange-selftests.c (_initialize_memrange_selftests): Add declaration.
* unittests/mkdir-recursive-selftests.c (_initialize_mkdir_recursive_selftests): Add declaration.
* unittests/observable-selftests.c (_initialize_observer_selftest): Add declaration.
* unittests/offset-type-selftests.c (_initialize_offset_type_selftests): Add declaration.
* unittests/optional-selftests.c (_initialize_optional_selftests): Add declaration.
* unittests/parse-connection-spec-selftests.c (_initialize_parse_connection_spec_selftests): Add declaration.
* unittests/rsp-low-selftests.c (_initialize_rsp_low_selftests): Add declaration.
* unittests/scoped_fd-selftests.c (_initialize_scoped_fd_selftests): Add declaration.
* unittests/scoped_mmap-selftests.c (_initialize_scoped_mmap_selftests): Add declaration.
* unittests/scoped_restore-selftests.c (_initialize_scoped_restore_selftests): Add declaration.
* unittests/string_view-selftests.c (_initialize_string_view_selftests): Add declaration.
* unittests/style-selftests.c (_initialize_style_selftest): Add declaration.
* unittests/tracepoint-selftests.c (_initialize_tracepoint_selftests): Add declaration.
* unittests/tui-selftests.c (_initialize_tui_selftest): Add
declaration.
* unittests/unpack-selftests.c (_initialize_unpack_selftests): Add declaration.
* unittests/utils-selftests.c (_initialize_utils_selftests): Add declaration.
* unittests/vec-utils-selftests.c (_initialize_vec_utils_selftests): Add declaration.
* unittests/xml-utils-selftests.c (_initialize_xml_utils): Add declaration.
* user-regs.c (_initialize_user_regs): Add declaration.
* utils.c (_initialize_utils): Add declaration.
* v850-tdep.c (_initialize_v850_tdep): Add declaration.
* valops.c (_initialize_valops): Add declaration.
* valprint.c (_initialize_valprint): Add declaration.
* value.c (_initialize_values): Add declaration.
* varobj.c (_initialize_varobj): Add declaration.
* vax-bsd-nat.c (_initialize_vaxbsd_nat): Add declaration.
* vax-nbsd-tdep.c (_initialize_vaxnbsd_tdep): Add declaration.
* vax-tdep.c (_initialize_vax_tdep): Add declaration.
* windows-nat.c (_initialize_windows_nat): Add declaration.
(_initialize_check_for_gdb_ini): Add declaration.
(_initialize_loadable): Add declaration.
* windows-tdep.c (_initialize_windows_tdep): Add declaration.
* x86-bsd-nat.c (_initialize_x86_bsd_nat): Add declaration.
* x86-linux-nat.c (_initialize_x86_linux_nat): Add declaration.
* xcoffread.c (_initialize_xcoffread): Add declaration.
* xml-support.c (_initialize_xml_support): Add declaration.
* xstormy16-tdep.c (_initialize_xstormy16_tdep): Add declaration.
* xtensa-linux-nat.c (_initialize_xtensa_linux_nat): Add declaration.
* xtensa-linux-tdep.c (_initialize_xtensa_linux_tdep): Add declaration.
* xtensa-tdep.c (_initialize_xtensa_tdep): Add declaration.
Change-Id: I13eec7e0ed2b3c427377a7bdb055cf46da64def9
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This commit adds multi-target support to GDB. What this means is that
with this commit, GDB can now be connected to different targets at the
same time. E.g., you can debug a live native process and a core dump
at the same time, connect to multiple gdbservers, etc.
Actually, the word "target" is overloaded in gdb. We already have a
target stack, with pushes several target_ops instances on top of one
another. We also have "info target" already, which means something
completely different to what this patch does.
So from here on, I'll be using the "target connections" term, to mean
an open process_stratum target, pushed on a target stack. This patch
makes gdb have multiple target stacks, and multiple process_stratum
targets open simultaneously. The user-visible changes / commands will
also use this terminology, but of course it's all open to debate.
User-interface-wise, not that much changes. The main difference is
that each inferior may have its own target connection.
A target connection (e.g., a target extended-remote connection) may
support debugging multiple processes, just as before.
Say you're debugging against gdbserver in extended-remote mode, and
you do "add-inferior" to prepare to spawn a new process, like:
(gdb) target extended-remote :9999
...
(gdb) start
...
(gdb) add-inferior
Added inferior 2
(gdb) inferior 2
[Switching to inferior 2 [<null>] (<noexec>)]
(gdb) file a.out
...
(gdb) start
...
At this point, you have two inferiors connected to the same gdbserver.
With this commit, GDB will maintain a target stack per inferior,
instead of a global target stack.
To preserve the behavior above, by default, "add-inferior" makes the
new inferior inherit a copy of the target stack of the current
inferior. Same across a fork - the child inherits a copy of the
target stack of the parent. While the target stacks are copied, the
targets themselves are not. Instead, target_ops is made a
refcounted_object, which means that target_ops instances are
refcounted, which each inferior counting for a reference.
What if you want to create an inferior and connect it to some _other_
target? For that, this commit introduces a new "add-inferior
-no-connection" option that makes the new inferior not share the
current inferior's target. So you could do:
(gdb) target extended-remote :9999
Remote debugging using :9999
...
(gdb) add-inferior -no-connection
[New inferior 2]
Added inferior 2
(gdb) inferior 2
[Switching to inferior 2 [<null>] (<noexec>)]
(gdb) info inferiors
Num Description Executable
1 process 18401 target:/home/pedro/tmp/main
* 2 <null>
(gdb) tar extended-remote :10000
Remote debugging using :10000
...
(gdb) info inferiors
Num Description Executable
1 process 18401 target:/home/pedro/tmp/main
* 2 process 18450 target:/home/pedro/tmp/main
(gdb)
A following patch will extended "info inferiors" to include a column
indicating which connection an inferior is bound to, along with a
couple other UI tweaks.
Other than that, debugging is the same as before. Users interact with
inferiors and threads as before. The only difference is that
inferiors may be bound to processes running in different machines.
That's pretty much all there is to it in terms of noticeable UI
changes.
On to implementation.
Since we can be connected to different systems at the same time, a
ptid_t is no longer a unique identifier. Instead a thread can be
identified by a pair of ptid_t and 'process_stratum_target *', the
later being the instance of the process_stratum target that owns the
process/thread. Note that process_stratum_target inherits from
target_ops, and all process_stratum targets inherit from
process_stratum_target. In earlier patches, many places in gdb were
converted to refer to threads by thread_info pointer instead of
ptid_t, but there are still places in gdb where we start with a
pid/tid and need to find the corresponding inferior or thread_info
objects. So you'll see in the patch many places adding a
process_stratum_target parameter to functions that used to take only a
ptid_t.
Since each inferior has its own target stack now, we can always find
the process_stratum target for an inferior. That is done via a
inf->process_target() convenience method.
Since each inferior has its own target stack, we need to handle the
"beneath" calls when servicing target calls. The solution I settled
with is just to make sure to switch the current inferior to the
inferior you want before making a target call. Not relying on global
context is just not feasible in current GDB. Fortunately, there
aren't that many places that need to do that, because generally most
code that calls target methods already has the current context
pointing to the right inferior/thread. Note, to emphasize -- there's
no method to "switch to this target stack". Instead, you switch the
current inferior, and that implicitly switches the target stack.
In some spots, we need to iterate over all inferiors so that we reach
all target stacks.
Native targets are still singletons. There's always only a single
instance of such targets.
Remote targets however, we'll have one instance per remote connection.
The exec target is still a singleton. There's only one instance. I
did not see the point of instanciating more than one exec_target
object.
After vfork, we need to make sure to push the exec target on the new
inferior. See exec_on_vfork.
For type safety, functions that need a {target, ptid} pair to identify
a thread, take a process_stratum_target pointer for target parameter
instead of target_ops *. Some shared code in gdb/nat/ also need to
gain a target pointer parameter. This poses an issue, since gdbserver
doesn't have process_stratum_target, only target_ops. To fix this,
this commit renames gdbserver's target_ops to process_stratum_target.
I think this makes sense. There's no concept of target stack in
gdbserver, and gdbserver's target_ops really implements a
process_stratum-like target.
The thread and inferior iterator functions also gain
process_stratum_target parameters. These are used to be able to
iterate over threads and inferiors of a given target. Following usual
conventions, if the target pointer is null, then we iterate over
threads and inferiors of all targets.
I tried converting "add-inferior" to the gdb::option framework, as a
preparatory patch, but that stumbled on the fact that gdb::option does
not support file options yet, for "add-inferior -exec". I have a WIP
patchset that adds that, but it's not a trivial patch, mainly due to
need to integrate readline's filename completion, so I deferred that
to some other time.
In infrun.c/infcmd.c, the main change is that we need to poll events
out of all targets. See do_target_wait. Right after collecting an
event, we switch the current inferior to an inferior bound to the
target that reported the event, so that target methods can be used
while handling the event. This makes most of the code transparent to
multi-targets. See fetch_inferior_event.
infrun.c:stop_all_threads is interesting -- in this function we need
to stop all threads of all targets. What the function does is send an
asynchronous stop request to all threads, and then synchronously waits
for events, with target_wait, rinse repeat, until all it finds are
stopped threads. Now that we have multiple targets, it's not
efficient to synchronously block in target_wait waiting for events out
of one target. Instead, we implement a mini event loop, with
interruptible_select, select'ing on one file descriptor per target.
For this to work, we need to be able to ask the target for a waitable
file descriptor. Such file descriptors already exist, they are the
descriptors registered in the main event loop with add_file_handler,
inside the target_async implementations. This commit adds a new
target_async_wait_fd target method that just returns the file
descriptor in question. See wait_one / stop_all_threads in infrun.c.
The 'threads_executing' global is made a per-target variable. Since
it is only relevant to process_stratum_target targets, this is where
it is put, instead of in target_ops.
You'll notice that remote.c includes some FIXME notes. These refer to
the fact that the global arrays that hold data for the remote packets
supported are still globals. For example, if we connect to two
different servers/stubs, then each might support different remote
protocol features. They might even be different architectures, like
e.g., one ARM baremetal stub, and a x86 gdbserver, to debug a
host/controller scenario as a single program. That isn't going to
work correctly today, because of said globals. I'm leaving fixing
that for another pass, since it does not appear to be trivial, and I'd
rather land the base work first. It's already useful to be able to
debug multiple instances of the same server (e.g., a distributed
cluster, where you have full control over the servers installed), so I
think as is it's already reasonable incremental progress.
Current limitations:
- You can only resume more that one target at the same time if all
targets support asynchronous debugging, and support non-stop mode.
It should be possible to support mixed all-stop + non-stop
backends, but that is left for another time. This means that
currently in order to do multi-target with gdbserver you need to
issue "maint set target-non-stop on". I would like to make that
mode be the default, but we're not there yet. Note that I'm
talking about how the target backend works, only. User-visible
all-stop mode works just fine.
- As explained above, connecting to different remote servers at the
same time is likely to produce bad results if they don't support the
exact set of RSP features.
FreeBSD updates courtesy of John Baldwin.
gdb/ChangeLog:
2020-01-10 Pedro Alves <palves@redhat.com>
John Baldwin <jhb@FreeBSD.org>
* aarch64-linux-nat.c
(aarch64_linux_nat_target::thread_architecture): Adjust.
* ada-tasks.c (print_ada_task_info): Adjust find_thread_ptid call.
(task_command_1): Likewise.
* aix-thread.c (sync_threadlists, aix_thread_target::resume)
(aix_thread_target::wait, aix_thread_target::fetch_registers)
(aix_thread_target::store_registers)
(aix_thread_target::thread_alive): Adjust.
* amd64-fbsd-tdep.c: Include "inferior.h".
(amd64fbsd_get_thread_local_address): Pass down target.
* amd64-linux-nat.c (ps_get_thread_area): Use ps_prochandle
thread's gdbarch instead of target_gdbarch.
* break-catch-sig.c (signal_catchpoint_print_it): Adjust call to
get_last_target_status.
* break-catch-syscall.c (print_it_catch_syscall): Likewise.
* breakpoint.c (breakpoints_should_be_inserted_now): Consider all
inferiors.
(update_inserted_breakpoint_locations): Skip if inferiors with no
execution.
(update_global_location_list): When handling moribund locations,
find representative inferior for location's pspace, and use thread
count of its process_stratum target.
* bsd-kvm.c (bsd_kvm_target_open): Pass target down.
* bsd-uthread.c (bsd_uthread_target::wait): Use
as_process_stratum_target and adjust thread_change_ptid and
add_thread calls.
(bsd_uthread_target::update_thread_list): Use
as_process_stratum_target and adjust find_thread_ptid,
thread_change_ptid and add_thread calls.
* btrace.c (maint_btrace_packet_history_cmd): Adjust
find_thread_ptid call.
* corelow.c (add_to_thread_list): Adjust add_thread call.
(core_target_open): Adjust add_thread_silent and thread_count
calls.
(core_target::pid_to_str): Adjust find_inferior_ptid call.
* ctf.c (ctf_target_open): Adjust add_thread_silent call.
* event-top.c (async_disconnect): Pop targets from all inferiors.
* exec.c (add_target_sections): Push exec target on all inferiors
sharing the program space.
(remove_target_sections): Remove the exec target from all
inferiors sharing the program space.
(exec_on_vfork): New.
* exec.h (exec_on_vfork): Declare.
* fbsd-nat.c (fbsd_add_threads): Add fbsd_nat_target parameter.
Pass it down.
(fbsd_nat_target::update_thread_list): Adjust.
(fbsd_nat_target::resume): Adjust.
(fbsd_handle_debug_trap): Add fbsd_nat_target parameter. Pass it
down.
(fbsd_nat_target::wait, fbsd_nat_target::post_attach): Adjust.
* fbsd-tdep.c (fbsd_corefile_thread): Adjust
get_thread_arch_regcache call.
* fork-child.c (gdb_startup_inferior): Pass target down to
startup_inferior and set_executing.
* gdbthread.h (struct process_stratum_target): Forward declare.
(add_thread, add_thread_silent, add_thread_with_info)
(in_thread_list): Add process_stratum_target parameter.
(find_thread_ptid(inferior*, ptid_t)): New overload.
(find_thread_ptid, thread_change_ptid): Add process_stratum_target
parameter.
(all_threads()): Delete overload.
(all_threads, all_non_exited_threads): Add process_stratum_target
parameter.
(all_threads_safe): Use brace initialization.
(thread_count): Add process_stratum_target parameter.
(set_resumed, set_running, set_stop_requested, set_executing)
(threads_are_executing, finish_thread_state): Add
process_stratum_target parameter.
(switch_to_thread): Use is_current_thread.
* i386-fbsd-tdep.c: Include "inferior.h".
(i386fbsd_get_thread_local_address): Pass down target.
* i386-linux-nat.c (i386_linux_nat_target::low_resume): Adjust.
* inf-child.c (inf_child_target::maybe_unpush_target): Remove
have_inferiors check.
* inf-ptrace.c (inf_ptrace_target::create_inferior)
(inf_ptrace_target::attach): Adjust.
* infcall.c (run_inferior_call): Adjust.
* infcmd.c (run_command_1): Pass target to
scoped_finish_thread_state.
(proceed_thread_callback): Skip inferiors with no execution.
(continue_command): Rename 'all_threads' local to avoid hiding
'all_threads' function. Adjust get_last_target_status call.
(prepare_one_step): Adjust set_running call.
(signal_command): Use user_visible_resume_target. Compare thread
pointers instead of inferior_ptid.
(info_program_command): Adjust to pass down target.
(attach_command): Mark target's 'thread_executing' flag.
(stop_current_target_threads_ns): New, factored out from ...
(interrupt_target_1): ... this. Switch inferior before making
target calls.
* inferior-iter.h
(struct all_inferiors_iterator, struct all_inferiors_range)
(struct all_inferiors_safe_range)
(struct all_non_exited_inferiors_range): Filter on
process_stratum_target too. Remove explicit.
* inferior.c (inferior::inferior): Push dummy target on target
stack.
(find_inferior_pid, find_inferior_ptid, number_of_live_inferiors):
Add process_stratum_target parameter, and pass it down.
(have_live_inferiors): Adjust.
(switch_to_inferior_and_push_target): New.
(add_inferior_command, clone_inferior_command): Handle
"-no-connection" parameter. Use
switch_to_inferior_and_push_target.
(_initialize_inferior): Mention "-no-connection" option in
the help of "add-inferior" and "clone-inferior" commands.
* inferior.h: Include "process-stratum-target.h".
(interrupt_target_1): Use bool.
(struct inferior) <push_target, unpush_target, target_is_pushed,
find_target_beneath, top_target, process_target, target_at,
m_stack>: New.
(discard_all_inferiors): Delete.
(find_inferior_pid, find_inferior_ptid, number_of_live_inferiors)
(all_inferiors, all_non_exited_inferiors): Add
process_stratum_target parameter.
* infrun.c: Include "gdb_select.h" and <unordered_map>.
(target_last_proc_target): New global.
(follow_fork_inferior): Push target on new inferior. Pass target
to add_thread_silent. Call exec_on_vfork. Handle target's
reference count.
(follow_fork): Adjust get_last_target_status call. Also consider
target.
(follow_exec): Push target on new inferior.
(struct execution_control_state) <target>: New field.
(user_visible_resume_target): New.
(do_target_resume): Call target_async.
(resume_1): Set target's threads_executing flag. Consider resume
target.
(commit_resume_all_targets): New.
(proceed): Also consider resume target. Skip threads of inferiors
with no execution. Commit resumtion in all targets.
(start_remote): Pass current inferior to wait_for_inferior.
(infrun_thread_stop_requested): Consider target as well. Pass
thread_info pointer to clear_inline_frame_state instead of ptid.
(infrun_thread_thread_exit): Consider target as well.
(random_pending_event_thread): New inferior parameter. Use it.
(do_target_wait): Rename to ...
(do_target_wait_1): ... this. Add inferior parameter, and pass it
down.
(threads_are_resumed_pending_p, do_target_wait): New.
(prepare_for_detach): Adjust calls.
(wait_for_inferior): New inferior parameter. Handle it. Use
do_target_wait_1 instead of do_target_wait.
(fetch_inferior_event): Adjust. Switch to representative
inferior. Pass target down.
(set_last_target_status): Add process_stratum_target parameter.
Save target in global.
(get_last_target_status): Add process_stratum_target parameter and
handle it.
(nullify_last_target_wait_ptid): Clear 'target_last_proc_target'.
(context_switch): Check inferior_ptid == null_ptid before calling
inferior_thread().
(get_inferior_stop_soon): Pass down target.
(wait_one): Rename to ...
(poll_one_curr_target): ... this.
(struct wait_one_event): New.
(wait_one): New.
(stop_all_threads): Adjust.
(handle_no_resumed, handle_inferior_event): Adjust to consider the
event's target.
(switch_back_to_stepped_thread): Also consider target.
(print_stop_event): Update.
(normal_stop): Update. Also consider the resume target.
* infrun.h (wait_for_inferior): Remove declaration.
(user_visible_resume_target): New declaration.
(get_last_target_status, set_last_target_status): New
process_stratum_target parameter.
* inline-frame.c (clear_inline_frame_state(ptid_t)): Add
process_stratum_target parameter, and use it.
(clear_inline_frame_state (thread_info*)): New.
* inline-frame.c (clear_inline_frame_state(ptid_t)): Add
process_stratum_target parameter.
(clear_inline_frame_state (thread_info*)): Declare.
* linux-fork.c (delete_checkpoint_command): Pass target down to
find_thread_ptid.
(checkpoint_command): Adjust.
* linux-nat.c (linux_nat_target::follow_fork): Switch to thread
instead of just tweaking inferior_ptid.
(linux_nat_switch_fork): Pass target down to thread_change_ptid.
(exit_lwp): Pass target down to find_thread_ptid.
(attach_proc_task_lwp_callback): Pass target down to
add_thread/set_running/set_executing.
(linux_nat_target::attach): Pass target down to
thread_change_ptid.
(get_detach_signal): Pass target down to find_thread_ptid.
Consider last target status's target.
(linux_resume_one_lwp_throw, resume_lwp)
(linux_handle_syscall_trap, linux_handle_extended_wait, wait_lwp)
(stop_wait_callback, save_stop_reason, linux_nat_filter_event)
(linux_nat_wait_1, resume_stopped_resumed_lwps): Pass target down.
(linux_nat_target::async_wait_fd): New.
(linux_nat_stop_lwp, linux_nat_target::thread_address_space): Pass
target down.
* linux-nat.h (linux_nat_target::async_wait_fd): Declare.
* linux-tdep.c (get_thread_arch_regcache): Pass target down.
* linux-thread-db.c (struct thread_db_info::process_target): New
field.
(add_thread_db_info): Save target.
(get_thread_db_info): New process_stratum_target parameter. Also
match target.
(delete_thread_db_info): New process_stratum_target parameter.
Also match target.
(thread_from_lwp): Adjust to pass down target.
(thread_db_notice_clone): Pass down target.
(check_thread_db_callback): Pass down target.
(try_thread_db_load_1): Always push the thread_db target.
(try_thread_db_load, record_thread): Pass target down.
(thread_db_target::detach): Pass target down. Always unpush the
thread_db target.
(thread_db_target::wait, thread_db_target::mourn_inferior): Pass
target down. Always unpush the thread_db target.
(find_new_threads_callback, thread_db_find_new_threads_2)
(thread_db_target::update_thread_list): Pass target down.
(thread_db_target::pid_to_str): Pass current inferior down.
(thread_db_target::get_thread_local_address): Pass target down.
(thread_db_target::resume, maintenance_check_libthread_db): Pass
target down.
* nto-procfs.c (nto_procfs_target::update_thread_list): Adjust.
* procfs.c (procfs_target::procfs_init_inferior): Declare.
(proc_set_current_signal, do_attach, procfs_target::wait): Adjust.
(procfs_init_inferior): Rename to ...
(procfs_target::procfs_init_inferior): ... this and adjust.
(procfs_target::create_inferior, procfs_notice_thread)
(procfs_do_thread_registers): Adjust.
* ppc-fbsd-tdep.c: Include "inferior.h".
(ppcfbsd_get_thread_local_address): Pass down target.
* proc-service.c (ps_xfer_memory): Switch current inferior and
program space as well.
(get_ps_regcache): Pass target down.
* process-stratum-target.c
(process_stratum_target::thread_address_space)
(process_stratum_target::thread_architecture): Pass target down.
* process-stratum-target.h
(process_stratum_target::threads_executing): New field.
(as_process_stratum_target): New.
* ravenscar-thread.c
(ravenscar_thread_target::update_inferior_ptid): Pass target down.
(ravenscar_thread_target::wait, ravenscar_add_thread): Pass target
down.
* record-btrace.c (record_btrace_target::info_record): Adjust.
(record_btrace_target::record_method)
(record_btrace_target::record_is_replaying)
(record_btrace_target::fetch_registers)
(get_thread_current_frame_id, record_btrace_target::resume)
(record_btrace_target::wait, record_btrace_target::stop): Pass
target down.
* record-full.c (record_full_wait_1): Switch to event thread.
Pass target down.
* regcache.c (regcache::regcache)
(get_thread_arch_aspace_regcache, get_thread_arch_regcache): Add
process_stratum_target parameter and handle it.
(current_thread_target): New global.
(get_thread_regcache): Add process_stratum_target parameter and
handle it. Switch inferior before calling target method.
(get_thread_regcache): Pass target down.
(get_thread_regcache_for_ptid): Pass target down.
(registers_changed_ptid): Add process_stratum_target parameter and
handle it.
(registers_changed_thread, registers_changed): Pass target down.
(test_get_thread_arch_aspace_regcache): New.
(current_regcache_test): Define a couple local test_target_ops
instances and use them for testing.
(readwrite_regcache): Pass process_stratum_target parameter.
(cooked_read_test, cooked_write_test): Pass mock_target down.
* regcache.h (get_thread_regcache, get_thread_arch_regcache)
(get_thread_arch_aspace_regcache): Add process_stratum_target
parameter.
(regcache::target): New method.
(regcache::regcache, regcache::get_thread_arch_aspace_regcache)
(regcache::registers_changed_ptid): Add process_stratum_target
parameter.
(regcache::m_target): New field.
(registers_changed_ptid): Add process_stratum_target parameter.
* remote.c (remote_state::supports_vCont_probed): New field.
(remote_target::async_wait_fd): New method.
(remote_unpush_and_throw): Add remote_target parameter.
(get_current_remote_target): Adjust.
(remote_target::remote_add_inferior): Push target.
(remote_target::remote_add_thread)
(remote_target::remote_notice_new_inferior)
(get_remote_thread_info): Pass target down.
(remote_target::update_thread_list): Skip threads of inferiors
bound to other targets. (remote_target::close): Don't discard
inferiors. (remote_target::add_current_inferior_and_thread)
(remote_target::process_initial_stop_replies)
(remote_target::start_remote)
(remote_target::remote_serial_quit_handler): Pass down target.
(remote_target::remote_unpush_target): New remote_target
parameter. Unpush the target from all inferiors.
(remote_target::remote_unpush_and_throw): New remote_target
parameter. Pass it down.
(remote_target::open_1): Check whether the current inferior has
execution instead of checking whether any inferior is live. Pass
target down.
(remote_target::remote_detach_1): Pass down target. Use
remote_unpush_target.
(extended_remote_target::attach): Pass down target.
(remote_target::remote_vcont_probe): Set supports_vCont_probed.
(remote_target::append_resumption): Pass down target.
(remote_target::append_pending_thread_resumptions)
(remote_target::remote_resume_with_hc, remote_target::resume)
(remote_target::commit_resume): Pass down target.
(remote_target::remote_stop_ns): Check supports_vCont_probed.
(remote_target::interrupt_query)
(remote_target::remove_new_fork_children)
(remote_target::check_pending_events_prevent_wildcard_vcont)
(remote_target::remote_parse_stop_reply)
(remote_target::process_stop_reply): Pass down target.
(first_remote_resumed_thread): New remote_target parameter. Pass
it down.
(remote_target::wait_as): Pass down target.
(unpush_and_perror): New remote_target parameter. Pass it down.
(remote_target::readchar, remote_target::remote_serial_write)
(remote_target::getpkt_or_notif_sane_1)
(remote_target::kill_new_fork_children, remote_target::kill): Pass
down target.
(remote_target::mourn_inferior): Pass down target. Use
remote_unpush_target.
(remote_target::core_of_thread)
(remote_target::remote_btrace_maybe_reopen): Pass down target.
(remote_target::pid_to_exec_file)
(remote_target::thread_handle_to_thread_info): Pass down target.
(remote_target::async_wait_fd): New.
* riscv-fbsd-tdep.c: Include "inferior.h".
(riscv_fbsd_get_thread_local_address): Pass down target.
* sol2-tdep.c (sol2_core_pid_to_str): Pass down target.
* sol-thread.c (sol_thread_target::wait, ps_lgetregs, ps_lsetregs)
(ps_lgetfpregs, ps_lsetfpregs, sol_update_thread_list_callback):
Adjust.
* solib-spu.c (spu_skip_standalone_loader): Pass down target.
* solib-svr4.c (enable_break): Pass down target.
* spu-multiarch.c (parse_spufs_run): Pass down target.
* spu-tdep.c (spu2ppu_sniffer): Pass down target.
* target-delegates.c: Regenerate.
* target.c (g_target_stack): Delete.
(current_top_target): Return the current inferior's top target.
(target_has_execution_1): Refer to the passed-in inferior's top
target.
(target_supports_terminal_ours): Check whether the initial
inferior was already created.
(decref_target): New.
(target_stack::push): Incref/decref the target.
(push_target, push_target, unpush_target): Adjust.
(target_stack::unpush): Defref target.
(target_is_pushed): Return bool. Adjust to refer to the current
inferior's target stack.
(dispose_inferior): Delete, and inline parts ...
(target_preopen): ... here. Only dispose of the current inferior.
(target_detach): Hold strong target reference while detaching.
Pass target down.
(target_thread_name): Add assertion.
(target_resume): Pass down target.
(target_ops::beneath, find_target_at): Adjust to refer to the
current inferior's target stack.
(get_dummy_target): New.
(target_pass_ctrlc): Pass the Ctrl-C to the first inferior that
has a thread running.
(initialize_targets): Rename to ...
(_initialize_target): ... this.
* target.h: Include "gdbsupport/refcounted-object.h".
(struct target_ops): Inherit refcounted_object.
(target_ops::shortname, target_ops::longname): Make const.
(target_ops::async_wait_fd): New method.
(decref_target): Declare.
(struct target_ops_ref_policy): New.
(target_ops_ref): New typedef.
(get_dummy_target): Declare function.
(target_is_pushed): Return bool.
* thread-iter.c (all_matching_threads_iterator::m_inf_matches)
(all_matching_threads_iterator::all_matching_threads_iterator):
Handle filter target.
* thread-iter.h (struct all_matching_threads_iterator, struct
all_matching_threads_range, class all_non_exited_threads_range):
Filter by target too. Remove explicit.
* thread.c (threads_executing): Delete.
(inferior_thread): Pass down current inferior.
(clear_thread_inferior_resources): Pass down thread pointer
instead of ptid_t.
(add_thread_silent, add_thread_with_info, add_thread): Add
process_stratum_target parameter. Use it for thread and inferior
searches.
(is_current_thread): New.
(thread_info::deletable): Use it.
(find_thread_ptid, thread_count, in_thread_list)
(thread_change_ptid, set_resumed, set_running): New
process_stratum_target parameter. Pass it down.
(set_executing): New process_stratum_target parameter. Pass it
down. Adjust reference to 'threads_executing'.
(threads_are_executing): New process_stratum_target parameter.
Adjust reference to 'threads_executing'.
(set_stop_requested, finish_thread_state): New
process_stratum_target parameter. Pass it down.
(switch_to_thread): Also match inferior.
(switch_to_thread): New process_stratum_target parameter. Pass it
down.
(update_threads_executing): Reimplement.
* top.c (quit_force): Pop targets from all inferior.
(gdb_init): Don't call initialize_targets.
* windows-nat.c (windows_nat_target) <get_windows_debug_event>:
Declare.
(windows_add_thread, windows_delete_thread): Adjust.
(get_windows_debug_event): Rename to ...
(windows_nat_target::get_windows_debug_event): ... this. Adjust.
* tracefile-tfile.c (tfile_target_open): Pass down target.
* gdbsupport/common-gdbthread.h (struct process_stratum_target):
Forward declare.
(switch_to_thread): Add process_stratum_target parameter.
* mi/mi-interp.c (mi_on_resume_1): Add process_stratum_target
parameter. Use it.
(mi_on_resume): Pass target down.
* nat/fork-inferior.c (startup_inferior): Add
process_stratum_target parameter. Pass it down.
* nat/fork-inferior.h (startup_inferior): Add
process_stratum_target parameter.
* python/py-threadevent.c (py_get_event_thread): Pass target down.
gdb/gdbserver/ChangeLog:
2020-01-10 Pedro Alves <palves@redhat.com>
* fork-child.c (post_fork_inferior): Pass target down to
startup_inferior.
* inferiors.c (switch_to_thread): Add process_stratum_target
parameter.
* lynx-low.c (lynx_target_ops): Now a process_stratum_target.
* nto-low.c (nto_target_ops): Now a process_stratum_target.
* linux-low.c (linux_target_ops): Now a process_stratum_target.
* remote-utils.c (prepare_resume_reply): Pass the target to
switch_to_thread.
* target.c (the_target): Now a process_stratum_target.
(done_accessing_memory): Pass the target to switch_to_thread.
(set_target_ops): Ajust to use process_stratum_target.
* target.h (struct target_ops): Rename to ...
(struct process_stratum_target): ... this.
(the_target, set_target_ops): Adjust.
(prepare_to_access_memory): Adjust comment.
* win32-low.c (child_xfer_memory): Adjust to use
process_stratum_target.
(win32_target_ops): Now a process_stratum_target.
|
|
While investigating some SVE code, i noticed the use of two spu bfd variables.
This looks like an oversight, as the "id" field is available for non-spu
architectures as well, even though its primary use was the Cell BE
architecture.
gdb/ChangeLog:
2020-01-05 Luis Machado <luis.machado@linaro.org>
* aarch64-linux-nat.c
(aarch64_linux_nat_target::thread_architecture): Use bfd_arch_aarch64
and bfd_mach_aarch64.
|
|
gdb/ChangeLog:
Update copyright year range in all GDB files.
|
|
Switch the Arm target to get target descriptions via arm_read_description
and aarch32_read_description, in the same style as other feature targets.
Add an enum to specify the different types - this will also be of use to
gdbserver in a later patch.
Under the hood return the same existing pre-feature target descriptions.
gdb/ChangeLog:
* Makefile.in: Add new files.
* aarch32-tdep.c: New file.
* aarch32-tdep.h: New file.
* aarch64-linux-nat.c (aarch64_linux_nat_target::read_description):
Call aarch32_read_description.
* arch/aarch32.c: New file.
* arch/aarch32.h: New file.
* arch/arm.c (arm_create_target_description)
(arm_create_mprofile_target_description): New function.
* arch/arm.h (arm_fp_type, arm_m_profile_type): New enum.
(arm_create_target_description)
(arm_create_mprofile_target_description): New declaration.
* arm-fbsd-tdep.c (arm_fbsd_read_description_auxv): Call
read_description functions.
* arm-linux-nat.c (arm_linux_nat_target::read_description):
Likewise.
* arm-linux-tdep.c (arm_linux_core_read_description): Likewise.
* arm-tdep.c (tdesc_arm_list): New variable.
(arm_register_g_packet_guesses): Call create description functions.
(arm_read_description) (arm_read_mprofile_description): New
function.
* arm-tdep.h (arm_read_description)
(arm_read_mprofile_description): Add declaration.
* configure.tgt: Add new files.
|
|
Both targets were using a mixture of defines and hardcoded values.
Add a standard set in arch/arm.h and use throughout, ensuring that
none of the existing sizes change.
No functionality changes.
gdb/ChangeLog:
* aarch32-linux-nat.h (VFP_REGS_SIZE): Remove define.
* aarch64-linux-nat.c (fetch_fpregs_from_thread)
(store_fpregs_to_thread)
(aarch64_linux_nat_target::read_description): Use ARM_VFP3_REGS_SIZE.
* arch/arm.h (IWMMXT_VEC_REGISTER_SIZE, ARM_CORE_REGS_SIZE)
(ARM_FP_REGS_SIZE, ARM_VFP2_REGS_SIZE, ARM_VFP3_REGS_SIZE)
(IWMMXT_REGS_SIZE): Add define.
* arm-linux-nat.c (IWMMXT_REGS_SIZE): Remove define.
(fetch_vfp_regs, store_vfp_regs)
(arm_linux_nat_target::read_description): Use ARM_VFP3_REGS_SIZE.
* arm-tdep.c (arm_register_g_packet_guesses): Use new defines.
gdb/gdbserver/ChangeLog:
* linux-aarch32-low.c (arm_read_description, arm_regsets): Use new
defines.
* linux-arm-low.c (arm_read_description, arm_regsets): Likewise.
|
|
When writing registers to the kernel, check if regcache VG has been changed. If
so then update the thread's vector length, then write back the registers.
When reading registers from the kernel, ensure regcache VG register is updated.
The regcache registers should already be of the correct length.
Remove all the checks that error if the vector length has changed.
gdb/ChangeLog:
* aarch64-linux-nat.c (store_sveregs_to_thread): Set vector length.
* nat/aarch64-sve-linux-ptrace.c (aarch64_sve_set_vq): New function.
(aarch64_sve_regs_copy_to_reg_buf): Remove VG checks.
(aarch64_sve_regs_copy_from_reg_buf): Likewise.
* nat/aarch64-sve-linux-ptrace.h (aarch64_sve_set_vq): New declaration.
|
|
Override the thread_architecture method, similar to SPU. If the vector
length has changed, then find the arch using info, making sure the vector
length is passed down to the init routine.
In the init routine, ensure the arch has the correct vector length.
Example output. Program is stopped in thread 2, just before it calls prctl
to change the vector length
(gdb) info threads
Id Target Id Frame
1 Thread 0xffffbf6f4000 (LWP 3188) "sve_change" 0x0000ffffbf6ae130 in pthread_join ()
* 2 Thread 0xffffbf55e200 (LWP 3189) "sve_change" thread1 (arg=0xfeedface) at sve_change_size.c:28
(gdb) print $vg
$1 = 8
(gdb) print $z0.s.u
$2 = {623191333, 623191333, 623191333, 623191333, 0 <repeats 12 times>}
(gdb) n
29 int ret = prctl(PR_SVE_SET_VL, vl/2);
(gdb) n
30 printf ("Changed: ret\n", ret);
(gdb) print $vg
$4 = 4
(gdb) print $z0.s.u
$5 = {623191333, 623191333, 623191333, 623191333, 0, 0, 0, 0}
(gdb) thr 1
[Switching to thread 1 (Thread 0xffffbf6f4000 (LWP 3181))]
(gdb) print $vg
$6 = 8
(gdb) print $z0.s.u
$7 = {623191333, 623191333, 623191333, 623191333, 0 <repeats 12 times>}
gdb/ChangeLog:
* aarch64-linux-nat.c
(aarch64_linux_nat_target::thread_architecture): Add override.
* aarch64-tdep.c (aarch64_gdbarch_init): Ensure different tdesc for
each VQ.
|
|
Andreas Schwab and John Baldwin pointed out some bugs in the header
sorting patch; and I noticed that the output was not correct when
limited to a subset of files (a bug in my script).
So, I'm reverting the patch. I may try again after fixing the issues
pointed out.
gdb/ChangeLog
2019-04-05 Tom Tromey <tom@tromey.com>
Revert the header-sorting patch.
* ft32-tdep.c: Revert.
* frv-tdep.c: Revert.
* frv-linux-tdep.c: Revert.
* frame.c: Revert.
* frame-unwind.c: Revert.
* frame-base.c: Revert.
* fork-child.c: Revert.
* findvar.c: Revert.
* findcmd.c: Revert.
* filesystem.c: Revert.
* filename-seen-cache.h: Revert.
* filename-seen-cache.c: Revert.
* fbsd-tdep.c: Revert.
* fbsd-nat.h: Revert.
* fbsd-nat.c: Revert.
* f-valprint.c: Revert.
* f-typeprint.c: Revert.
* f-lang.c: Revert.
* extension.h: Revert.
* extension.c: Revert.
* extension-priv.h: Revert.
* expprint.c: Revert.
* exec.h: Revert.
* exec.c: Revert.
* exceptions.c: Revert.
* event-top.c: Revert.
* event-loop.c: Revert.
* eval.c: Revert.
* elfread.c: Revert.
* dwarf2read.h: Revert.
* dwarf2read.c: Revert.
* dwarf2loc.c: Revert.
* dwarf2expr.h: Revert.
* dwarf2expr.c: Revert.
* dwarf2-frame.c: Revert.
* dwarf2-frame-tailcall.c: Revert.
* dwarf-index-write.h: Revert.
* dwarf-index-write.c: Revert.
* dwarf-index-common.c: Revert.
* dwarf-index-cache.h: Revert.
* dwarf-index-cache.c: Revert.
* dummy-frame.c: Revert.
* dtrace-probe.c: Revert.
* disasm.h: Revert.
* disasm.c: Revert.
* disasm-selftests.c: Revert.
* dictionary.c: Revert.
* dicos-tdep.c: Revert.
* demangle.c: Revert.
* dcache.h: Revert.
* dcache.c: Revert.
* darwin-nat.h: Revert.
* darwin-nat.c: Revert.
* darwin-nat-info.c: Revert.
* d-valprint.c: Revert.
* d-namespace.c: Revert.
* d-lang.c: Revert.
* ctf.c: Revert.
* csky-tdep.c: Revert.
* csky-linux-tdep.c: Revert.
* cris-tdep.c: Revert.
* cris-linux-tdep.c: Revert.
* cp-valprint.c: Revert.
* cp-support.c: Revert.
* cp-namespace.c: Revert.
* cp-abi.c: Revert.
* corelow.c: Revert.
* corefile.c: Revert.
* continuations.c: Revert.
* completer.h: Revert.
* completer.c: Revert.
* complaints.c: Revert.
* coffread.c: Revert.
* coff-pe-read.c: Revert.
* cli-out.h: Revert.
* cli-out.c: Revert.
* charset.c: Revert.
* c-varobj.c: Revert.
* c-valprint.c: Revert.
* c-typeprint.c: Revert.
* c-lang.c: Revert.
* buildsym.c: Revert.
* buildsym-legacy.c: Revert.
* build-id.h: Revert.
* build-id.c: Revert.
* btrace.c: Revert.
* bsd-uthread.c: Revert.
* breakpoint.h: Revert.
* breakpoint.c: Revert.
* break-catch-throw.c: Revert.
* break-catch-syscall.c: Revert.
* break-catch-sig.c: Revert.
* blockframe.c: Revert.
* block.c: Revert.
* bfin-tdep.c: Revert.
* bfin-linux-tdep.c: Revert.
* bfd-target.c: Revert.
* bcache.c: Revert.
* ax-general.c: Revert.
* ax-gdb.h: Revert.
* ax-gdb.c: Revert.
* avr-tdep.c: Revert.
* auxv.c: Revert.
* auto-load.c: Revert.
* arm-wince-tdep.c: Revert.
* arm-tdep.c: Revert.
* arm-symbian-tdep.c: Revert.
* arm-pikeos-tdep.c: Revert.
* arm-obsd-tdep.c: Revert.
* arm-nbsd-tdep.c: Revert.
* arm-nbsd-nat.c: Revert.
* arm-linux-tdep.c: Revert.
* arm-linux-nat.c: Revert.
* arm-fbsd-tdep.c: Revert.
* arm-fbsd-nat.c: Revert.
* arm-bsd-tdep.c: Revert.
* arch-utils.c: Revert.
* arc-tdep.c: Revert.
* arc-newlib-tdep.c: Revert.
* annotate.h: Revert.
* annotate.c: Revert.
* amd64-windows-tdep.c: Revert.
* amd64-windows-nat.c: Revert.
* amd64-tdep.c: Revert.
* amd64-sol2-tdep.c: Revert.
* amd64-obsd-tdep.c: Revert.
* amd64-obsd-nat.c: Revert.
* amd64-nbsd-tdep.c: Revert.
* amd64-nbsd-nat.c: Revert.
* amd64-nat.c: Revert.
* amd64-linux-tdep.c: Revert.
* amd64-linux-nat.c: Revert.
* amd64-fbsd-tdep.c: Revert.
* amd64-fbsd-nat.c: Revert.
* amd64-dicos-tdep.c: Revert.
* amd64-darwin-tdep.c: Revert.
* amd64-bsd-nat.c: Revert.
* alpha-tdep.c: Revert.
* alpha-obsd-tdep.c: Revert.
* alpha-nbsd-tdep.c: Revert.
* alpha-mdebug-tdep.c: Revert.
* alpha-linux-tdep.c: Revert.
* alpha-linux-nat.c: Revert.
* alpha-bsd-tdep.c: Revert.
* alpha-bsd-nat.c: Revert.
* aix-thread.c: Revert.
* agent.c: Revert.
* addrmap.c: Revert.
* ada-varobj.c: Revert.
* ada-valprint.c: Revert.
* ada-typeprint.c: Revert.
* ada-tasks.c: Revert.
* ada-lang.c: Revert.
* aarch64-tdep.c: Revert.
* aarch64-ravenscar-thread.c: Revert.
* aarch64-newlib-tdep.c: Revert.
* aarch64-linux-tdep.c: Revert.
* aarch64-linux-nat.c: Revert.
* aarch64-fbsd-tdep.c: Revert.
* aarch64-fbsd-nat.c: Revert.
* aarch32-linux-nat.c: Revert.
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