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binutils-gdb/gdb/nto-procfs.c
Pedro Alves 5b6d1e4fa4 Multi-target support 
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.
2020-01-10 20:06:08 +00:00

1609 lines
40 KiB
C
Raw Blame History

/* Machine independent support for QNX Neutrino /proc (process file system)
for GDB. Written by Colin Burgess at QNX Software Systems Limited.
Copyright (C) 2003-2020 Free Software Foundation, Inc.
Contributed by QNX Software Systems Ltd.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include <fcntl.h>
#include <spawn.h>
#include <sys/debug.h>
#include <sys/procfs.h>
#include <sys/neutrino.h>
#include <sys/syspage.h>
#include <dirent.h>
#include <sys/netmgr.h>
#include <sys/auxv.h>
#include "gdbcore.h"
#include "inferior.h"
#include "target.h"
#include "objfiles.h"
#include "gdbthread.h"
#include "nto-tdep.h"
#include "command.h"
#include "regcache.h"
#include "solib.h"
#include "inf-child.h"
#include "gdbsupport/filestuff.h"
#include "gdbsupport/scoped_fd.h"
#define NULL_PID 0
#define _DEBUG_FLAG_TRACE (_DEBUG_FLAG_TRACE_EXEC|_DEBUG_FLAG_TRACE_RD|\
_DEBUG_FLAG_TRACE_WR|_DEBUG_FLAG_TRACE_MODIFY)
int ctl_fd;
static sighandler_t ofunc;
static procfs_run run;
/* Create the "native" and "procfs" targets. */
struct nto_procfs_target : public inf_child_target
{
void open (const char *arg, int from_tty) override;
void attach (const char *, int) override = 0;
void post_attach (int);
void detach (inferior *, int) override;
void resume (ptid_t, int, enum gdb_signal) override;
ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
enum target_xfer_status xfer_partial (enum target_object object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len) override;
void files_info () override;
int insert_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int remove_breakpoint (struct gdbarch *, struct bp_target_info *,
enum remove_bp_reason) override;
int can_use_hw_breakpoint (enum bptype, int, int) override;
int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
struct expression *) override;
int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
struct expression *) override;
bool stopped_by_watchpoint () override;
void kill () override;
void create_inferior (const char *, const std::string &,
char **, int) override;
void mourn_inferior () override;
void pass_signals (gdb::array_view<const unsigned char>) override;
bool thread_alive (ptid_t ptid) override;
void update_thread_list () override;
std::string pid_to_str (ptid_t) override;
void interrupt () override;
const char *extra_thread_info (struct thread_info *) override;
char *pid_to_exec_file (int pid) override;
};
/* For "target native". */
static const target_info nto_native_target_info = {
"native",
N_("QNX Neutrino local process"),
N_("QNX Neutrino local process (started by the \"run\" command).")
};
class nto_procfs_target_native final : public nto_procfs_target
{
const target_info &info () const override
{ return nto_native_target_info; }
};
/* For "target procfs <node>". */
static const target_info nto_procfs_target_info = {
"procfs",
N_("QNX Neutrino local or remote process"),
N_("QNX Neutrino process. target procfs NODE")
};
struct nto_procfs_target_procfs final : public nto_procfs_target
{
const target_info &info () const override
{ return nto_procfs_target_info; }
};
static ptid_t do_attach (ptid_t ptid);
/* These two globals are only ever set in procfs_open_1, but are
referenced elsewhere. 'nto_procfs_node' is a flag used to say
whether we are local, or we should get the current node descriptor
for the remote QNX node. */
static char *nodestr;
static unsigned nto_procfs_node = ND_LOCAL_NODE;
/* Return the current QNX Node, or error out. This is a simple
wrapper for the netmgr_strtond() function. The reason this
is required is because QNX node descriptors are transient so
we have to re-acquire them every time. */
static unsigned
nto_node (void)
{
unsigned node;
if (ND_NODE_CMP (nto_procfs_node, ND_LOCAL_NODE) == 0
|| nodestr == NULL)
return ND_LOCAL_NODE;
node = netmgr_strtond (nodestr, 0);
if (node == -1)
error (_("Lost the QNX node. Debug session probably over."));
return (node);
}
static enum gdb_osabi
procfs_is_nto_target (bfd *abfd)
{
return GDB_OSABI_QNXNTO;
}
/* This is called when we call 'target native' or 'target procfs
<arg>' from the (gdb) prompt. For QNX6 (nto), the only valid arg
will be a QNX node string, eg: "/net/some_node". If arg is not a
valid QNX node, we will default to local. */
void
nto_procfs_target::open (const char *arg, int from_tty)
{
char *endstr;
char buffer[50];
int total_size;
procfs_sysinfo *sysinfo;
char nto_procfs_path[PATH_MAX];
/* Offer to kill previous inferiors before opening this target. */
target_preopen (from_tty);
nto_is_nto_target = procfs_is_nto_target;
/* Set the default node used for spawning to this one,
and only override it if there is a valid arg. */
xfree (nodestr);
nodestr = NULL;
nto_procfs_node = ND_LOCAL_NODE;
nodestr = (arg != NULL) ? xstrdup (arg) : NULL;
if (nodestr)
{
nto_procfs_node = netmgr_strtond (nodestr, &endstr);
if (nto_procfs_node == -1)
{
if (errno == ENOTSUP)
printf_filtered ("QNX Net Manager not found.\n");
printf_filtered ("Invalid QNX node %s: error %d (%s).\n", nodestr,
errno, safe_strerror (errno));
xfree (nodestr);
nodestr = NULL;
nto_procfs_node = ND_LOCAL_NODE;
}
else if (*endstr)
{
if (*(endstr - 1) == '/')
*(endstr - 1) = 0;
else
*endstr = 0;
}
}
snprintf (nto_procfs_path, PATH_MAX - 1, "%s%s",
(nodestr != NULL) ? nodestr : "", "/proc");
scoped_fd fd (open (nto_procfs_path, O_RDONLY));
if (fd.get () == -1)
{
printf_filtered ("Error opening %s : %d (%s)\n", nto_procfs_path, errno,
safe_strerror (errno));
error (_("Invalid procfs arg"));
}
sysinfo = (void *) buffer;
if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, sizeof buffer, 0) != EOK)
{
printf_filtered ("Error getting size: %d (%s)\n", errno,
safe_strerror (errno));
error (_("Devctl failed."));
}
else
{
total_size = sysinfo->total_size;
sysinfo = alloca (total_size);
if (sysinfo == NULL)
{
printf_filtered ("Memory error: %d (%s)\n", errno,
safe_strerror (errno));
error (_("alloca failed."));
}
else
{
if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, total_size, 0)
!= EOK)
{
printf_filtered ("Error getting sysinfo: %d (%s)\n", errno,
safe_strerror (errno));
error (_("Devctl failed."));
}
else
{
if (sysinfo->type !=
nto_map_arch_to_cputype (gdbarch_bfd_arch_info
(target_gdbarch ())->arch_name))
error (_("Invalid target CPU."));
}
}
}
inf_child_target::open (arg, from_tty);
printf_filtered ("Debugging using %s\n", nto_procfs_path);
}
static void
procfs_set_thread (ptid_t ptid)
{
pid_t tid;
tid = ptid.tid ();
devctl (ctl_fd, DCMD_PROC_CURTHREAD, &tid, sizeof (tid), 0);
}
/* Return true if the thread TH is still alive. */
bool
nto_procfs_target::thread_alive (ptid_t ptid)
{
pid_t tid;
pid_t pid;
procfs_status status;
int err;
tid = ptid.tid ();
pid = ptid.pid ();
if (kill (pid, 0) == -1)
return false;
status.tid = tid;
if ((err = devctl (ctl_fd, DCMD_PROC_TIDSTATUS,
&status, sizeof (status), 0)) != EOK)
return false;
/* Thread is alive or dead but not yet joined,
or dead and there is an alive (or dead unjoined) thread with
higher tid.
If the tid is not the same as requested, requested tid is dead. */
return (status.tid == tid) && (status.state != STATE_DEAD);
}
static void
update_thread_private_data_name (struct thread_info *new_thread,
const char *newname)
{
nto_thread_info *pti = get_nto_thread_info (new_thread);
gdb_assert (newname != NULL);
gdb_assert (new_thread != NULL);
if (pti)
{
pti = new nto_thread_info;
new_thread->priv.reset (pti);
}
pti->name = newname;
}
static void
update_thread_private_data (struct thread_info *new_thread,
pthread_t tid, int state, int flags)
{
procfs_info pidinfo;
struct _thread_name *tn;
procfs_threadctl tctl;
#if _NTO_VERSION > 630
gdb_assert (new_thread != NULL);
if (devctl (ctl_fd, DCMD_PROC_INFO, &pidinfo,
sizeof(pidinfo), 0) != EOK)
return;
memset (&tctl, 0, sizeof (tctl));
tctl.cmd = _NTO_TCTL_NAME;
tn = (struct _thread_name *) (&tctl.data);
/* Fetch name for the given thread. */
tctl.tid = tid;
tn->name_buf_len = sizeof (tctl.data) - sizeof (*tn);
tn->new_name_len = -1; /* Getting, not setting. */
if (devctl (ctl_fd, DCMD_PROC_THREADCTL, &tctl, sizeof (tctl), NULL) != EOK)
tn->name_buf[0] = '\0';
tn->name_buf[_NTO_THREAD_NAME_MAX] = '\0';
update_thread_private_data_name (new_thread, tn->name_buf);
nto_thread_info *pti = get_nto_thread_info (new_thread);
pti->tid = tid;
pti->state = state;
pti->flags = flags;
#endif /* _NTO_VERSION */
}
void
nto_procfs_target::update_thread_list ()
{
procfs_status status;
pid_t pid;
ptid_t ptid;
pthread_t tid;
struct thread_info *new_thread;
if (ctl_fd == -1)
return;
prune_threads ();
pid = inferior_ptid.pid ();
status.tid = 1;
for (tid = 1;; ++tid)
{
if (status.tid == tid
&& (devctl (ctl_fd, DCMD_PROC_TIDSTATUS, &status, sizeof (status), 0)
!= EOK))
break;
if (status.tid != tid)
/* The reason why this would not be equal is that devctl might have
returned different tid, meaning the requested tid no longer exists
(e.g. thread exited). */
continue;
ptid = ptid_t (pid, 0, tid);
new_thread = find_thread_ptid (this, ptid);
if (!new_thread)
new_thread = add_thread (ptid);
update_thread_private_data (new_thread, tid, status.state, 0);
status.tid++;
}
return;
}
static void
procfs_pidlist (const char *args, int from_tty)
{
struct dirent *dirp = NULL;
char buf[PATH_MAX];
procfs_info *pidinfo = NULL;
procfs_debuginfo *info = NULL;
procfs_status *status = NULL;
pid_t num_threads = 0;
pid_t pid;
char name[512];
char procfs_dir[PATH_MAX];
snprintf (procfs_dir, sizeof (procfs_dir), "%s%s",
(nodestr != NULL) ? nodestr : "", "/proc");
gdb_dir_up dp (opendir (procfs_dir));
if (dp == NULL)
{
fprintf_unfiltered (gdb_stderr, "failed to opendir \"%s\" - %d (%s)",
procfs_dir, errno, safe_strerror (errno));
return;
}
/* Start scan at first pid. */
rewinddir (dp.get ());
do
{
/* Get the right pid and procfs path for the pid. */
do
{
dirp = readdir (dp.get ());
if (dirp == NULL)
return;
snprintf (buf, sizeof (buf), "%s%s/%s/as",
(nodestr != NULL) ? nodestr : "",
"/proc", dirp->d_name);
pid = atoi (dirp->d_name);
}
while (pid == 0);
/* Open the procfs path. */
scoped_fd fd (open (buf, O_RDONLY));
if (fd.get () == -1)
{
fprintf_unfiltered (gdb_stderr, "failed to open %s - %d (%s)\n",
buf, errno, safe_strerror (errno));
continue;
}
pidinfo = (procfs_info *) buf;
if (devctl (fd.get (), DCMD_PROC_INFO, pidinfo, sizeof (buf), 0) != EOK)
{
fprintf_unfiltered (gdb_stderr,
"devctl DCMD_PROC_INFO failed - %d (%s)\n",
errno, safe_strerror (errno));
break;
}
num_threads = pidinfo->num_threads;
info = (procfs_debuginfo *) buf;
if (devctl (fd.get (), DCMD_PROC_MAPDEBUG_BASE, info, sizeof (buf), 0)
!= EOK)
strcpy (name, "unavailable");
else
strcpy (name, info->path);
/* Collect state info on all the threads. */
status = (procfs_status *) buf;
for (status->tid = 1; status->tid <= num_threads; status->tid++)
{
const int err
= devctl (fd.get (), DCMD_PROC_TIDSTATUS, status, sizeof (buf), 0);
printf_filtered ("%s - %d", name, pid);
if (err == EOK && status->tid != 0)
printf_filtered ("/%d\n", status->tid);
else
{
printf_filtered ("\n");
break;
}
}
}
while (dirp != NULL);
}
static void
procfs_meminfo (const char *args, int from_tty)
{
procfs_mapinfo *mapinfos = NULL;
static int num_mapinfos = 0;
procfs_mapinfo *mapinfo_p, *mapinfo_p2;
int flags = ~0, err, num, i, j;
struct
{
procfs_debuginfo info;
char buff[_POSIX_PATH_MAX];
} map;
struct info
{
unsigned addr;
unsigned size;
unsigned flags;
unsigned debug_vaddr;
unsigned long long offset;
};
struct printinfo
{
unsigned long long ino;
unsigned dev;
struct info text;
struct info data;
char name[256];
} printme;
/* Get the number of map entrys. */
err = devctl (ctl_fd, DCMD_PROC_MAPINFO, NULL, 0, &num);
if (err != EOK)
{
printf ("failed devctl num mapinfos - %d (%s)\n", err,
safe_strerror (err));
return;
}
mapinfos = XNEWVEC (procfs_mapinfo, num);
num_mapinfos = num;
mapinfo_p = mapinfos;
/* Fill the map entrys. */
err = devctl (ctl_fd, DCMD_PROC_MAPINFO, mapinfo_p, num
* sizeof (procfs_mapinfo), &num);
if (err != EOK)
{
printf ("failed devctl mapinfos - %d (%s)\n", err, safe_strerror (err));
xfree (mapinfos);
return;
}
num = std::min (num, num_mapinfos);
/* Run through the list of mapinfos, and store the data and text info
so we can print it at the bottom of the loop. */
for (mapinfo_p = mapinfos, i = 0; i < num; i++, mapinfo_p++)
{
if (!(mapinfo_p->flags & flags))
mapinfo_p->ino = 0;
if (mapinfo_p->ino == 0) /* Already visited. */
continue;
map.info.vaddr = mapinfo_p->vaddr;
err = devctl (ctl_fd, DCMD_PROC_MAPDEBUG, &map, sizeof (map), 0);
if (err != EOK)
continue;
memset (&printme, 0, sizeof printme);
printme.dev = mapinfo_p->dev;
printme.ino = mapinfo_p->ino;
printme.text.addr = mapinfo_p->vaddr;
printme.text.size = mapinfo_p->size;
printme.text.flags = mapinfo_p->flags;
printme.text.offset = mapinfo_p->offset;
printme.text.debug_vaddr = map.info.vaddr;
strcpy (printme.name, map.info.path);
/* Check for matching data. */
for (mapinfo_p2 = mapinfos, j = 0; j < num; j++, mapinfo_p2++)
{
if (mapinfo_p2->vaddr != mapinfo_p->vaddr
&& mapinfo_p2->ino == mapinfo_p->ino
&& mapinfo_p2->dev == mapinfo_p->dev)
{
map.info.vaddr = mapinfo_p2->vaddr;
err =
devctl (ctl_fd, DCMD_PROC_MAPDEBUG, &map, sizeof (map), 0);
if (err != EOK)
continue;
if (strcmp (map.info.path, printme.name))
continue;
/* Lower debug_vaddr is always text, if necessary, swap. */
if ((int) map.info.vaddr < (int) printme.text.debug_vaddr)
{
memcpy (&(printme.data), &(printme.text),
sizeof (printme.data));
printme.text.addr = mapinfo_p2->vaddr;
printme.text.size = mapinfo_p2->size;
printme.text.flags = mapinfo_p2->flags;
printme.text.offset = mapinfo_p2->offset;
printme.text.debug_vaddr = map.info.vaddr;
}
else
{
printme.data.addr = mapinfo_p2->vaddr;
printme.data.size = mapinfo_p2->size;
printme.data.flags = mapinfo_p2->flags;
printme.data.offset = mapinfo_p2->offset;
printme.data.debug_vaddr = map.info.vaddr;
}
mapinfo_p2->ino = 0;
}
}
mapinfo_p->ino = 0;
printf_filtered ("%s\n", printme.name);
printf_filtered ("\ttext=%08x bytes @ 0x%08x\n", printme.text.size,
printme.text.addr);
printf_filtered ("\t\tflags=%08x\n", printme.text.flags);
printf_filtered ("\t\tdebug=%08x\n", printme.text.debug_vaddr);
printf_filtered ("\t\toffset=%s\n", phex (printme.text.offset, 8));
if (printme.data.size)
{
printf_filtered ("\tdata=%08x bytes @ 0x%08x\n", printme.data.size,
printme.data.addr);
printf_filtered ("\t\tflags=%08x\n", printme.data.flags);
printf_filtered ("\t\tdebug=%08x\n", printme.data.debug_vaddr);
printf_filtered ("\t\toffset=%s\n", phex (printme.data.offset, 8));
}
printf_filtered ("\tdev=0x%x\n", printme.dev);
printf_filtered ("\tino=0x%x\n", (unsigned int) printme.ino);
}
xfree (mapinfos);
return;
}
/* Print status information about what we're accessing. */
void
nto_procfs_target::files_info ()
{
struct inferior *inf = current_inferior ();
printf_unfiltered ("\tUsing the running image of %s %s via %s.\n",
inf->attach_flag ? "attached" : "child",
target_pid_to_str (inferior_ptid).c_str (),
(nodestr != NULL) ? nodestr : "local node");
}
/* Target to_pid_to_exec_file implementation. */
char *
nto_procfs_target::pid_to_exec_file (const int pid)
{
int proc_fd;
static char proc_path[PATH_MAX];
ssize_t rd;
/* Read exe file name. */
snprintf (proc_path, sizeof (proc_path), "%s/proc/%d/exefile",
(nodestr != NULL) ? nodestr : "", pid);
proc_fd = open (proc_path, O_RDONLY);
if (proc_fd == -1)
return NULL;
rd = read (proc_fd, proc_path, sizeof (proc_path) - 1);
close (proc_fd);
if (rd <= 0)
{
proc_path[0] = '\0';
return NULL;
}
proc_path[rd] = '\0';
return proc_path;
}
/* Attach to process PID, then initialize for debugging it. */
void
nto_procfs_target::attach (const char *args, int from_tty)
{
int pid;
struct inferior *inf;
pid = parse_pid_to_attach (args);
if (pid == getpid ())
error (_("Attaching GDB to itself is not a good idea..."));
if (from_tty)
{
const char *exec_file = get_exec_file (0);
if (exec_file)
printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
target_pid_to_str (ptid_t (pid)).c_str ());
else
printf_unfiltered ("Attaching to %s\n",
target_pid_to_str (ptid_t (pid)).c_str ());
}
inferior_ptid = do_attach (ptid_t (pid));
inf = current_inferior ();
inferior_appeared (inf, pid);
inf->attach_flag = 1;
if (!target_is_pushed (ops))
push_target (ops);
procfs_update_thread_list (ops);
}
void
nto_procfs_target::post_attach (pid_t pid)
{
if (exec_bfd)
solib_create_inferior_hook (0);
}
static ptid_t
do_attach (ptid_t ptid)
{
procfs_status status;
struct sigevent event;
char path[PATH_MAX];
snprintf (path, PATH_MAX - 1, "%s%s/%d/as",
(nodestr != NULL) ? nodestr : "", "/proc", ptid.pid ());
ctl_fd = open (path, O_RDWR);
if (ctl_fd == -1)
error (_("Couldn't open proc file %s, error %d (%s)"), path, errno,
safe_strerror (errno));
if (devctl (ctl_fd, DCMD_PROC_STOP, &status, sizeof (status), 0) != EOK)
error (_("Couldn't stop process"));
/* Define a sigevent for process stopped notification. */
event.sigev_notify = SIGEV_SIGNAL_THREAD;
event.sigev_signo = SIGUSR1;
event.sigev_code = 0;
event.sigev_value.sival_ptr = NULL;
event.sigev_priority = -1;
devctl (ctl_fd, DCMD_PROC_EVENT, &event, sizeof (event), 0);
if (devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0) == EOK
&& status.flags & _DEBUG_FLAG_STOPPED)
SignalKill (nto_node (), ptid.pid (), 0, SIGCONT, 0, 0);
nto_init_solib_absolute_prefix ();
return ptid_t (ptid.pid (), 0, status.tid);
}
/* Ask the user what to do when an interrupt is received. */
static void
interrupt_query (void)
{
if (query (_("Interrupted while waiting for the program.\n\
Give up (and stop debugging it)? ")))
{
target_mourn_inferior (inferior_ptid);
quit ();
}
}
/* The user typed ^C twice. */
static void
nto_handle_sigint_twice (int signo)
{
signal (signo, ofunc);
interrupt_query ();
signal (signo, nto_handle_sigint_twice);
}
static void
nto_handle_sigint (int signo)
{
/* If this doesn't work, try more severe steps. */
signal (signo, nto_handle_sigint_twice);
target_interrupt ();
}
sptid_t
nto_procfs_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
int options)
{
sigset_t set;
siginfo_t info;
procfs_status status;
static int exit_signo = 0; /* To track signals that cause termination. */
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
if (inferior_ptid == null_ptid)
{
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig = GDB_SIGNAL_0;
exit_signo = 0;
return null_ptid;
}
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
while (!(status.flags & _DEBUG_FLAG_ISTOP))
{
ofunc = signal (SIGINT, nto_handle_sigint);
sigwaitinfo (&set, &info);
signal (SIGINT, ofunc);
devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
}
nto_inferior_data (NULL)->stopped_flags = status.flags;
nto_inferior_data (NULL)->stopped_pc = status.ip;
if (status.flags & _DEBUG_FLAG_SSTEP)
{
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig = GDB_SIGNAL_TRAP;
}
/* Was it a breakpoint? */
else if (status.flags & _DEBUG_FLAG_TRACE)
{
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig = GDB_SIGNAL_TRAP;
}
else if (status.flags & _DEBUG_FLAG_ISTOP)
{
switch (status.why)
{
case _DEBUG_WHY_SIGNALLED:
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig =
gdb_signal_from_host (status.info.si_signo);
exit_signo = 0;
break;
case _DEBUG_WHY_FAULTED:
ourstatus->kind = TARGET_WAITKIND_STOPPED;
if (status.info.si_signo == SIGTRAP)
{
ourstatus->value.sig = 0;
exit_signo = 0;
}
else
{
ourstatus->value.sig =
gdb_signal_from_host (status.info.si_signo);
exit_signo = ourstatus->value.sig;
}
break;
case _DEBUG_WHY_TERMINATED:
{
int waitval = 0;
waitpid (inferior_ptid.pid (), &waitval, WNOHANG);
if (exit_signo)
{
/* Abnormal death. */
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
ourstatus->value.sig = exit_signo;
}
else
{
/* Normal death. */
ourstatus->kind = TARGET_WAITKIND_EXITED;
ourstatus->value.integer = WEXITSTATUS (waitval);
}
exit_signo = 0;
break;
}
case _DEBUG_WHY_REQUESTED:
/* We are assuming a requested stop is due to a SIGINT. */
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig = GDB_SIGNAL_INT;
exit_signo = 0;
break;
}
}
return ptid_t (status.pid, 0, status.tid);
}
/* Read the current values of the inferior's registers, both the
general register set and floating point registers (if supported)
and update gdb's idea of their current values. */
void
nto_procfs_target::fetch_registers (struct regcache *regcache, int regno)
{
union
{
procfs_greg greg;
procfs_fpreg fpreg;
procfs_altreg altreg;
}
reg;
int regsize;
procfs_set_thread (regcache->ptid ());
if (devctl (ctl_fd, DCMD_PROC_GETGREG, &reg, sizeof (reg), &regsize) == EOK)
nto_supply_gregset (regcache, (char *) &reg.greg);
if (devctl (ctl_fd, DCMD_PROC_GETFPREG, &reg, sizeof (reg), &regsize)
== EOK)
nto_supply_fpregset (regcache, (char *) &reg.fpreg);
if (devctl (ctl_fd, DCMD_PROC_GETALTREG, &reg, sizeof (reg), &regsize)
== EOK)
nto_supply_altregset (regcache, (char *) &reg.altreg);
}
/* Helper for procfs_xfer_partial that handles memory transfers.
Arguments are like target_xfer_partial. */
static enum target_xfer_status
procfs_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)
{
int nbytes;
if (lseek (ctl_fd, (off_t) memaddr, SEEK_SET) != (off_t) memaddr)
return TARGET_XFER_E_IO;
if (writebuf != NULL)
nbytes = write (ctl_fd, writebuf, len);
else
nbytes = read (ctl_fd, readbuf, len);
if (nbytes <= 0)
return TARGET_XFER_E_IO;
*xfered_len = nbytes;
return TARGET_XFER_OK;
}
/* Target to_xfer_partial implementation. */
enum target_xfer_status
nto_procfs_target::xfer_partial (enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf, ULONGEST offset,
ULONGEST len, ULONGEST *xfered_len)
{
switch (object)
{
case TARGET_OBJECT_MEMORY:
return procfs_xfer_memory (readbuf, writebuf, offset, len, xfered_len);
case TARGET_OBJECT_AUXV:
if (readbuf != NULL)
{
int err;
CORE_ADDR initial_stack;
debug_process_t procinfo;
/* For 32-bit architecture, size of auxv_t is 8 bytes. */
const unsigned int sizeof_auxv_t = sizeof (auxv_t);
const unsigned int sizeof_tempbuf = 20 * sizeof_auxv_t;
int tempread;
gdb_byte *const tempbuf = alloca (sizeof_tempbuf);
if (tempbuf == NULL)
return TARGET_XFER_E_IO;
err = devctl (ctl_fd, DCMD_PROC_INFO, &procinfo,
sizeof procinfo, 0);
if (err != EOK)
return TARGET_XFER_E_IO;
initial_stack = procinfo.initial_stack;
/* procfs is always 'self-hosted', no byte-order manipulation. */
tempread = nto_read_auxv_from_initial_stack (initial_stack, tempbuf,
sizeof_tempbuf,
sizeof (auxv_t));
tempread = std::min (tempread, len) - offset;
memcpy (readbuf, tempbuf + offset, tempread);
*xfered_len = tempread;
return tempread ? TARGET_XFER_OK : TARGET_XFER_EOF;
}
/* Fallthru */
default:
return this->beneath ()->xfer_partial (object, annex,
readbuf, writebuf, offset, len,
xfered_len);
}
}
/* Take a program previously attached to and detaches it.
The program resumes execution and will no longer stop
on signals, etc. We'd better not have left any breakpoints
in the program or it'll die when it hits one. */
void
nto_procfs_target::detach (inferior *inf, int from_tty)
{
int pid;
target_announce_detach ();
if (siggnal)
SignalKill (nto_node (), inferior_ptid.pid (), 0, 0, 0, 0);
close (ctl_fd);
ctl_fd = -1;
pid = inferior_ptid.pid ();
inferior_ptid = null_ptid;
detach_inferior (pid);
init_thread_list ();
inf_child_maybe_unpush_target (ops);
}
static int
procfs_breakpoint (CORE_ADDR addr, int type, int size)
{
procfs_break brk;
brk.type = type;
brk.addr = addr;
brk.size = size;
errno = devctl (ctl_fd, DCMD_PROC_BREAK, &brk, sizeof (brk), 0);
if (errno != EOK)
return 1;
return 0;
}
int
nto_procfs_target::insert_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
bp_tgt->placed_address = bp_tgt->reqstd_address;
return procfs_breakpoint (bp_tgt->placed_address, _DEBUG_BREAK_EXEC, 0);
}
int
nto_procfs_target::remove_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt,
enum remove_bp_reason reason)
{
return procfs_breakpoint (bp_tgt->placed_address, _DEBUG_BREAK_EXEC, -1);
}
int
nto_procfs_target::insert_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
bp_tgt->placed_address = bp_tgt->reqstd_address;
return procfs_breakpoint (bp_tgt->placed_address,
_DEBUG_BREAK_EXEC | _DEBUG_BREAK_HW, 0);
}
int
nto_procfs_target::remove_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
return procfs_breakpoint (bp_tgt->placed_address,
_DEBUG_BREAK_EXEC | _DEBUG_BREAK_HW, -1);
}
void
nto_procfs_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
{
int signal_to_pass;
procfs_status status;
sigset_t *run_fault = (sigset_t *) (void *) &run.fault;
if (inferior_ptid == null_ptid)
return;
procfs_set_thread (ptid == minus_one_ptid ? inferior_ptid :
ptid);
run.flags = _DEBUG_RUN_FAULT | _DEBUG_RUN_TRACE;
if (step)
run.flags |= _DEBUG_RUN_STEP;
sigemptyset (run_fault);
sigaddset (run_fault, FLTBPT);
sigaddset (run_fault, FLTTRACE);
sigaddset (run_fault, FLTILL);
sigaddset (run_fault, FLTPRIV);
sigaddset (run_fault, FLTBOUNDS);
sigaddset (run_fault, FLTIOVF);
sigaddset (run_fault, FLTIZDIV);
sigaddset (run_fault, FLTFPE);
/* Peter V will be changing this at some point. */
sigaddset (run_fault, FLTPAGE);
run.flags |= _DEBUG_RUN_ARM;
signal_to_pass = gdb_signal_to_host (signo);
if (signal_to_pass)
{
devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
signal_to_pass = gdb_signal_to_host (signo);
if (status.why & (_DEBUG_WHY_SIGNALLED | _DEBUG_WHY_FAULTED))
{
if (signal_to_pass != status.info.si_signo)
{
SignalKill (nto_node (), inferior_ptid.pid (), 0,
signal_to_pass, 0, 0);
run.flags |= _DEBUG_RUN_CLRFLT | _DEBUG_RUN_CLRSIG;
}
else /* Let it kill the program without telling us. */
sigdelset (&run.trace, signal_to_pass);
}
}
else
run.flags |= _DEBUG_RUN_CLRSIG | _DEBUG_RUN_CLRFLT;
errno = devctl (ctl_fd, DCMD_PROC_RUN, &run, sizeof (run), 0);
if (errno != EOK)
{
perror (_("run error!\n"));
return;
}
}
void
nto_procfs_target::mourn_inferior ()
{
if (inferior_ptid != null_ptid)
{
SignalKill (nto_node (), inferior_ptid.pid (), 0, SIGKILL, 0, 0);
close (ctl_fd);
}
inferior_ptid = null_ptid;
init_thread_list ();
inf_child_mourn_inferior (ops);
}
/* This function breaks up an argument string into an argument
vector suitable for passing to execvp().
E.g., on "run a b c d" this routine would get as input
the string "a b c d", and as output it would fill in argv with
the four arguments "a", "b", "c", "d". The only additional
functionality is simple quoting. The gdb command:
run a "b c d" f
will fill in argv with the three args "a", "b c d", "e". */
static void
breakup_args (char *scratch, char **argv)
{
char *pp, *cp = scratch;
char quoting = 0;
for (;;)
{
/* Scan past leading separators. */
quoting = 0;
while (*cp == ' ' || *cp == '\t' || *cp == '\n')
cp++;
/* Break if at end of string. */
if (*cp == '\0')
break;
/* Take an arg. */
if (*cp == '"')
{
cp++;
quoting = strchr (cp, '"') ? 1 : 0;
}
*argv++ = cp;
/* Scan for next arg separator. */
pp = cp;
if (quoting)
cp = strchr (pp, '"');
if ((cp == NULL) || (!quoting))
cp = strchr (pp, ' ');
if (cp == NULL)
cp = strchr (pp, '\t');
if (cp == NULL)
cp = strchr (pp, '\n');
/* No separators => end of string => break. */
if (cp == NULL)
{
pp = cp;
break;
}
/* Replace the separator with a terminator. */
*cp++ = '\0';
}
/* Execv requires a null-terminated arg vector. */
*argv = NULL;
}
void
nto_procfs_target::create_inferior (const char *exec_file,
const std::string &allargs,
char **env, int from_tty)
{
struct inheritance inherit;
pid_t pid;
int flags, errn;
char **argv, *args;
const char *in = "", *out = "", *err = "";
int fd, fds[3];
sigset_t set;
const char *inferior_io_terminal = get_inferior_io_terminal ();
struct inferior *inf;
argv = xmalloc ((allargs.size () / (unsigned) 2 + 2) *
sizeof (*argv));
argv[0] = const_cast<char *> (get_exec_file (1));
if (!argv[0])
{
if (exec_file)
argv[0] = exec_file;
else
return;
}
args = xstrdup (allargs.c_str ());
breakup_args (args, (exec_file != NULL) ? &argv[1] : &argv[0]);
argv = nto_parse_redirection (argv, &in, &out, &err);
fds[0] = STDIN_FILENO;
fds[1] = STDOUT_FILENO;
fds[2] = STDERR_FILENO;
/* If the user specified I/O via gdb's --tty= arg, use it, but only
if the i/o is not also being specified via redirection. */
if (inferior_io_terminal)
{
if (!in[0])
in = inferior_io_terminal;
if (!out[0])
out = inferior_io_terminal;
if (!err[0])
err = inferior_io_terminal;
}
if (in[0])
{
fd = open (in, O_RDONLY);
if (fd == -1)
perror (in);
else
fds[0] = fd;
}
if (out[0])
{
fd = open (out, O_WRONLY);
if (fd == -1)
perror (out);
else
fds[1] = fd;
}
if (err[0])
{
fd = open (err, O_WRONLY);
if (fd == -1)
perror (err);
else
fds[2] = fd;
}
/* Clear any pending SIGUSR1's but keep the behavior the same. */
signal (SIGUSR1, signal (SIGUSR1, SIG_IGN));
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
sigprocmask (SIG_UNBLOCK, &set, NULL);
memset (&inherit, 0, sizeof (inherit));
if (ND_NODE_CMP (nto_procfs_node, ND_LOCAL_NODE) != 0)
{
inherit.nd = nto_node ();
inherit.flags |= SPAWN_SETND;
inherit.flags &= ~SPAWN_EXEC;
}
inherit.flags |= SPAWN_SETGROUP | SPAWN_HOLD;
inherit.pgroup = SPAWN_NEWPGROUP;
pid = spawnp (argv[0], 3, fds, &inherit, argv,
ND_NODE_CMP (nto_procfs_node, ND_LOCAL_NODE) == 0 ? env : 0);
xfree (args);
sigprocmask (SIG_BLOCK, &set, NULL);
if (pid == -1)
error (_("Error spawning %s: %d (%s)"), argv[0], errno,
safe_strerror (errno));
if (fds[0] != STDIN_FILENO)
close (fds[0]);
if (fds[1] != STDOUT_FILENO)
close (fds[1]);
if (fds[2] != STDERR_FILENO)
close (fds[2]);
inferior_ptid = do_attach (ptid_t (pid));
procfs_update_thread_list (ops);
inf = current_inferior ();
inferior_appeared (inf, pid);
inf->attach_flag = 0;
flags = _DEBUG_FLAG_KLC; /* Kill-on-Last-Close flag. */
errn = devctl (ctl_fd, DCMD_PROC_SET_FLAG, &flags, sizeof (flags), 0);
if (errn != EOK)
{
/* FIXME: expected warning? */
/* warning( "Failed to set Kill-on-Last-Close flag: errno = %d(%s)\n",
errn, safe_strerror(errn) ); */
}
if (!target_is_pushed (ops))
push_target (ops);
target_terminal::init ();
if (exec_bfd != NULL
|| (symfile_objfile != NULL && symfile_objfile->obfd != NULL))
solib_create_inferior_hook (0);
}
void
nto_procfs_target::interrupt ()
{
devctl (ctl_fd, DCMD_PROC_STOP, NULL, 0, 0);
}
void
nto_procfs_target::kill ()
{
target_mourn_inferior (inferior_ptid);
}
/* Fill buf with regset and return devctl cmd to do the setting. Return
-1 if we fail to get the regset. Store size of regset in regsize. */
static int
get_regset (int regset, char *buf, int bufsize, int *regsize)
{
int dev_get, dev_set;
switch (regset)
{
case NTO_REG_GENERAL:
dev_get = DCMD_PROC_GETGREG;
dev_set = DCMD_PROC_SETGREG;
break;
case NTO_REG_FLOAT:
dev_get = DCMD_PROC_GETFPREG;
dev_set = DCMD_PROC_SETFPREG;
break;
case NTO_REG_ALT:
dev_get = DCMD_PROC_GETALTREG;
dev_set = DCMD_PROC_SETALTREG;
break;
case NTO_REG_SYSTEM:
default:
return -1;
}
if (devctl (ctl_fd, dev_get, buf, bufsize, regsize) != EOK)
return -1;
return dev_set;
}
void
nto_procfs_target::store_registers (struct regcache *regcache, int regno)
{
union
{
procfs_greg greg;
procfs_fpreg fpreg;
procfs_altreg altreg;
}
reg;
unsigned off;
int len, regset, regsize, dev_set, err;
char *data;
ptid_t ptid = regcache->ptid ();
if (ptid == null_ptid)
return;
procfs_set_thread (ptid);
if (regno == -1)
{
for (regset = NTO_REG_GENERAL; regset < NTO_REG_END; regset++)
{
dev_set = get_regset (regset, (char *) &reg,
sizeof (reg), &regsize);
if (dev_set == -1)
continue;
if (nto_regset_fill (regcache, regset, (char *) &reg) == -1)
continue;
err = devctl (ctl_fd, dev_set, &reg, regsize, 0);
if (err != EOK)
fprintf_unfiltered (gdb_stderr,
"Warning unable to write regset %d: %s\n",
regno, safe_strerror (err));
}
}
else
{
regset = nto_regset_id (regno);
if (regset == -1)
return;
dev_set = get_regset (regset, (char *) &reg, sizeof (reg), &regsize);
if (dev_set == -1)
return;
len = nto_register_area (regcache->arch (),
regno, regset, &off);
if (len < 1)
return;
regcache->raw_collect (regno, (char *) &reg + off);
err = devctl (ctl_fd, dev_set, &reg, regsize, 0);
if (err != EOK)
fprintf_unfiltered (gdb_stderr,
"Warning unable to write regset %d: %s\n", regno,
safe_strerror (err));
}
}
/* Set list of signals to be handled in the target. */
void
nto_procfs_target::pass_signals
(gdb::array_view<const unsigned char> pass_signals)
{
int signo;
sigfillset (&run.trace);
for (signo = 1; signo < NSIG; signo++)
{
int target_signo = gdb_signal_from_host (signo);
if (target_signo < pass_signals.size () && pass_signals[target_signo])
sigdelset (&run.trace, signo);
}
}
std::string
nto_procfs_target::pid_to_str (ptid_t ptid)
{
int pid, tid;
struct tidinfo *tip;
pid = ptid.pid ();
tid = ptid.tid ();
#if 0 /* NYI */
tip = procfs_thread_info (pid, tid);
if (tip != NULL)
snprintf (&buf[n], 1023, " (state = 0x%02x)", tip->state);
#endif
return string_printf ("process %d", pid);
}
/* to_can_run implementation for "target procfs". Note this really
means "can this target be the default run target", which there can
be only one, and we make it be "target native" like other ports.
"target procfs <node>" wouldn't make sense as default run target, as
it needs <node>. */
int
nto_procfs_target::can_run ()
{
return 0;
}
/* "target procfs". */
static nto_procfs_target_procfs nto_procfs_ops;
/* "target native". */
static nto_procfs_target_native nto_native_ops;
/* Create the "native" and "procfs" targets. */
static void
init_procfs_targets (void)
{
/* Register "target native". This is the default run target. */
add_target (nto_native_target_info, inf_child_open_target);
set_native_target (&nto_native_ops);
/* Register "target procfs <node>". */
add_target (nto_procfs_target_info, inf_child_open_target);
}
#define OSTYPE_NTO 1
void
_initialize_procfs (void)
{
sigset_t set;
init_procfs_targets ();
/* We use SIGUSR1 to gain control after we block waiting for a process.
We use sigwaitevent to wait. */
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
sigprocmask (SIG_BLOCK, &set, NULL);
/* Initially, make sure all signals are reported. */
sigfillset (&run.trace);
/* Stuff some information. */
nto_cpuinfo_flags = SYSPAGE_ENTRY (cpuinfo)->flags;
nto_cpuinfo_valid = 1;
add_info ("pidlist", procfs_pidlist, _("pidlist"));
add_info ("meminfo", procfs_meminfo, _("memory information"));
nto_is_nto_target = procfs_is_nto_target;
}
static int
procfs_hw_watchpoint (int addr, int len, enum target_hw_bp_type type)
{
procfs_break brk;
switch (type)
{
case hw_read:
brk.type = _DEBUG_BREAK_RD;
break;
case hw_access:
brk.type = _DEBUG_BREAK_RW;
break;
default: /* Modify. */
/* FIXME: brk.type = _DEBUG_BREAK_RWM gives EINVAL for some reason. */
brk.type = _DEBUG_BREAK_RW;
}
brk.type |= _DEBUG_BREAK_HW; /* Always ask for HW. */
brk.addr = addr;
brk.size = len;
errno = devctl (ctl_fd, DCMD_PROC_BREAK, &brk, sizeof (brk), 0);
if (errno != EOK)
{
perror (_("Failed to set hardware watchpoint"));
return -1;
}
return 0;
}
bool
nto_procfs_target::can_use_hw_breakpoint (enum bptype type,
int cnt, int othertype)
{
return 1;
}
int
nto_procfs_target::remove_hw_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond)
{
return procfs_hw_watchpoint (addr, -1, type);
}
int
nto_procfs_target::insert_hw_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond)
{
return procfs_hw_watchpoint (addr, len, type);
}
bool
nto_procfs_target::stopped_by_watchpoint ()
{
/* NOTE: nto_stopped_by_watchpoint will be called ONLY while we are
stopped due to a SIGTRAP. This assumes gdb works in 'all-stop' mode;
future gdb versions will likely run in 'non-stop' mode in which case
we will have to store/examine statuses per thread in question.
Until then, this will work fine. */
struct inferior *inf = current_inferior ();
struct nto_inferior_data *inf_data;
gdb_assert (inf != NULL);
inf_data = nto_inferior_data (inf);
return inf_data->stopped_flags
& (_DEBUG_FLAG_TRACE_RD
| _DEBUG_FLAG_TRACE_WR
| _DEBUG_FLAG_TRACE_MODIFY);
}
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