Although we can tell upfront whether a remote target supports target
side commands, we can only tell whether the target supports that in
combination with a given breakpoint kind (software, hardware,
watchpoints, etc.) when we go and try to insert such a breakpoint kind
the first time. It's not desirable to make remote_insert_breakpoint
simply return -1 in this case, because if the breakpoint was set in a
shared library, insert_bp_location will assume that the breakpoint
insertion failed because the library wasn't mapped in.
insert_bp_location already handles errors/exceptions thrown from the
target_insert_xxx methods, exactly so the backend can tell the user
the detailed reason the insertion of hw breakpoints failed. But, in
the case of software breakpoints, it discards the detailed error
message.
So the patch makes insert_bp_location use the error's message for SW
breakpoints too, and, introduces a NOT_SUPPORTED_ERROR error code so
that insert_bp_location doesn't confuse the error for failure due to a
shared library disappearing.
The result is:
(gdb) c
Warning:
Cannot insert breakpoint 2: Target doesn't support breakpoints that have target side commands.
2014-01-09 Pedro Alves <palves@redhat.com>
Hui Zhu <hui@codesourcery.com>
PR gdb/16101
* breakpoint.c (insert_bp_location): Rename hw_bp_err_string to
bp_err_string. Don't mark the location shlib_disabled if the
error thrown wasn't a generic or memory error. Catch errors
thrown while inserting breakpoints in overlayed code. Output
error message of software breakpoints.
* remote.c (remote_insert_breakpoint): If this breakpoint has
target-side commands but this stub doesn't support Z0 packets,
throw NOT_SUPPORTED_ERROR error.
* exceptions.h (enum errors) <NOT_SUPPORTED_ERROR>: New error.
* target.h (target_insert_breakpoint): Extend comment.
(target_insert_hw_breakpoint): Add comment.
Currently, when GDB connects in all-stop mode, GDBserver always
responds to the status packet with a GDB_SIGNAL_TRAP, even if the
program is actually stopped for some other signal.
(gdb) tar rem ...
...
(gdb) c
Program received signal SIGUSR1, User defined signal 1.
(gdb) disconnect
(gdb) tar rem ...
(gdb) c
(Or a GDB crash instead of an explicit disconnect.)
This results in the program losing that signal on that last continue,
because gdb will tell the target to resume with no signal (to suppress
the GDB_SIGNAL_TRAP, due to 'handle SISGTRAP nopass'), and that will
actually suppress the real signal the program had stopped for
(SIGUSR1). To fix that, I think we should make GDBserver report the
real signal the thread had stopped for in response to the status
packet:
@item ?
@cindex @samp{?} packet
Indicate the reason the target halted. The reply is the same as for
step and continue.
But, that raises the question -- which thread are we reporting the
status for? Due to how the RSP in all-stop works, we can only report
one status. The status packet's response is a stop reply packet, so
it includes the thread identifier, so it's not a problem packet-wise.
However, GDBserver is currently always reporting the status for first
thread in the thread list, even though that may well not be the thread
that got the signal that caused the program to stop. So the next
logical step would be to report the status for the
last_ptid/last_status thread (the last event reported to gdb), if it's
still around; and if not, fallback to some other thread.
There's an issue on the GDB side with that, though...
GDB currently always adds the thread reported in response to the
status query as the first thread in its list. That means that if we
start with e.g.,
(gdb) info threads
3 Thread 1003 ...
* 2 Thread 1002 ...
1 Thread 1001 ...
And reconnect:
(gdb) disconnect
(gdb) tar rem ...
We end up with:
(gdb) info threads
3 Thread 1003 ...
2 Thread 1001 ...
* 1 Thread 1002 ...
Not a real big issue, but it's reasonably fixable, by having GDB
fetch/sync the thread list before fetching the status/'?', and then
using the status to select the right thread as current on the GDB
side. Holes in the thread numbers are squashed before/after
reconnection (e.g., 2,3,5 becomes 1,2,3), but the order is preserved,
which I think is both good, and good enough.
However (yes, there's more...), the previous GDB that was connected
might have had gdbserver running in non-stop mode, or could have left
gdbserver doing disconnected tracing (which also forces non-stop), and
if the new gdb/connection is in all-stop mode, we can end up with more
than one thread with a signal to report back to gdb. As we can only
report one thread/status (in the all-stop RSP variant; the non-stop
variant doesn't have this issue), we get to do what we do at every
other place we have this situation -- leave events we can't report
right now as pending, so that the next resume picks them up.
Note all this ammounts to a QoI change, within the existing framework.
There's really no RSP change here.
The only user visible change (other than that the signal is program is
stopped at isn't lost / is passed to the program), is in "info
program", that now can show the signal the program stopped for. Of
course, the next resume will respect the pass/nopass setting for the
signal in question. It'd be reasonable to have the initial connection
tell the user the program was stopped with a signal, similar to when
we load a core to debug, but I'm leaving that out for a future change.
I think we'll need to either change how handle_inferior_event & co
handle stop_soon, or maybe bypass them completely (like
fork-child.c:startup_inferior) for that.
Tested on x86_64 Fedora 17.
gdb/gdbserver/
2014-01-08 Pedro Alves <palves@redhat.com>
* gdbthread.h (struct thread_info) <status_pending_p>: New field.
* server.c (visit_actioned_threads, handle_pending_status): New
function.
(handle_v_cont): Factor out parts to ...
(resume): ... this new function. If in all-stop, and a thread
being resumed has a pending status, report it without actually
resuming.
(myresume): Adjust to use the new 'resume' function.
(clear_pending_status_callback, set_pending_status_callback)
(find_status_pending_thread_callback): New functions.
(handle_status): Handle the case of multiple threads having
interesting statuses to report. Report threads' real last signal
instead of always reporting GDB_SIGNAL_TRAP. Look for a thread
with an interesting thread to report the status for, instead of
always reporting the status of the first thread.
gdb/
2014-01-08 Pedro Alves <palves@redhat.com>
* remote.c (remote_add_thread): Add threads silently if starting
up.
(remote_notice_new_inferior): If in all-stop, and starting up,
don't call notice_new_inferior.
(get_current_thread): New function, factored out from ...
(add_current_inferior_and_thread): ... this. Adjust.
(remote_start_remote) <all-stop>: Fetch the thread list. If we
found any thread, then select the remote's current thread as GDB's
current thread too.
gdb/testsuite/
2014-01-08 Pedro Alves <palves@redhat.com>
* gdb.threads/reconnect-signal.c: New file.
* gdb.threads/reconnect-signal.exp: New file.
Remote servers may cut the connection abruptly since they are not
required to reply to a 'k' (Kill) packet sent from GDB.
This patch addresses any issues arising from such scenario, which
leads to a GDB internal error due to an attempt to pop the target more
than once. With the patch, this failure is handled gracefully.
Here's the GDB backtrace Maciej got running the testsuite against
QEMU. Full paths edited out for brevity.
#0 0x55573430 in __kernel_vsyscall ()
#1 0x557a2951 in raise () from /lib32/libc.so.6
#2 0x557a5d82 in abort () from /lib32/libc.so.6
#3 0x0826e2e4 in dump_core ()
at .../gdb/utils.c:635
#4 0x0826e5b6 in internal_vproblem (problem=0x85200c0,
file=0x8416be8 ".../gdb/target.c", line=2861,
fmt=0x84174ac "could not find a target to follow mourn inferior",
ap=0xffa4796c "\f")
at .../gdb/utils.c:804
#5 0x0826e5fb in internal_verror (
file=0x8416be8 ".../gdb/target.c", line=2861,
fmt=0x84174ac "could not find a target to follow mourn inferior",
ap=0xffa4796c "\f")
at .../gdb/utils.c:820
#6 0x0826e633 in internal_error (
file=0x8416be8 ".../gdb/target.c", line=2861,
string=0x84174ac "could not find a target to follow mourn inferior")
at .../gdb/utils.c:830
#7 0x081b4ad0 in target_mourn_inferior ()
at .../gdb/target.c:2861
#8 0x08082283 in remote_kill (ops=0x85245e0)
at .../gdb/remote.c:7840
#9 0x081b06d1 in target_kill ()
at .../gdb/target.c:486
#10 0x081b42f6 in dispose_inferior (inf=0xa501c60, args=0x0)
at .../gdb/target.c:2570
#11 0x08290cfc in iterate_over_inferiors (
callback=0x81b42af <dispose_inferior>, data=0x0)
at .../gdb/inferior.c:396
#12 0x081b435a in target_preopen (from_tty=1)
at .../gdb/target.c:2591
#13 0x0807c2c6 in remote_open_1 (name=0xa5538b6 "localhost:1237", from_tty=1,
target=0x85245e0, extended_p=0)
at .../gdb/remote.c:4292
#14 0x0807b7a8 in remote_open (name=0xa5538b6 "localhost:1237", from_tty=1)
at .../gdb/remote.c:3655
#15 0x080a23d4 in do_cfunc (c=0xa464f30, args=0xa5538b6 "localhost:1237",
from_tty=1)
at .../gdb/cli/cli-decode.c:107
#16 0x080a4c3b in cmd_func (cmd=0xa464f30, args=0xa5538b6 "localhost:1237",
from_tty=1)
at .../gdb/cli/cli-decode.c:1882
#17 0x0826bebf in execute_command (p=0xa5538c3 "7", from_tty=1)
at .../gdb/top.c:467
#18 0x08193f2d in command_handler (command=0xa5538a8 "")
at .../gdb/event-top.c:435
#19 0x08194463 in command_line_handler (
rl=0xa778198 "target remote localhost:1237")
at .../gdb/event-top.c:633
#20 0x082ba92b in rl_callback_read_char ()
at .../readline/callback.c:220
#21 0x08193adf in rl_callback_read_char_wrapper (client_data=0x0)
at .../gdb/event-top.c:164
#22 0x08193e57 in stdin_event_handler (error=0, client_data=0x0)
at .../gdb/event-top.c:375
#23 0x08192f29 in handle_file_event (data=...)
at .../gdb/event-loop.c:768
#24 0x0819266a in process_event ()
at .../gdb/event-loop.c:342
#25 0x08192708 in gdb_do_one_event ()
at .../gdb/event-loop.c:394
#26 0x08192781 in start_event_loop ()
at .../gdb/event-loop.c:431
#27 0x08193b08 in cli_command_loop (data=0x0)
at .../gdb/event-top.c:179
#28 0x0818bc26 in current_interp_command_loop ()
at .../gdb/interps.c:327
#29 0x0818c4e5 in captured_command_loop (data=0x0)
at .../gdb/main.c:267
#30 0x0818a37f in catch_errors (func=0x818c4d0 <captured_command_loop>,
func_args=0x0, errstring=0x8402108 "", mask=RETURN_MASK_ALL)
at .../gdb/exceptions.c:524
#31 0x0818d736 in captured_main (data=0xffa47f10)
at .../gdb/main.c:1067
#32 0x0818a37f in catch_errors (func=0x818c723 <captured_main>,
func_args=0xffa47f10, errstring=0x8402108 "", mask=RETURN_MASK_ALL)
at .../gdb/exceptions.c:524
#33 0x0818d76c in gdb_main (args=0xffa47f10)
at .../gdb/main.c:1076
#34 0x0804dd1b in main (argc=5, argv=0xffa47fd4)
at .../gdb/gdb.c:34
The corresponding gdb.log excerpt:
(gdb) PASS: gdb.base/bitfields.exp: bitfield uniqueness (u9)
cont
Continuing.
Breakpoint 1, break1 () at .../gdb/testsuite/gdb.base/bitfields.c:44
44 }
(gdb) PASS: gdb.base/bitfields.exp: continuing to break1 #9
print flags
$10 = {uc = 0 '\000', s1 = 0, u1 = 0, s2 = 0, u2 = 0, s3 = 0, u3 = 0, s9 = 0, u9 = 0, sc = 1 '\001'}
(gdb) PASS: gdb.base/bitfields.exp: bitfield uniqueness (sc)
delete breakpoints
Delete all breakpoints? (y or n) y
(gdb) info breakpoints
No breakpoints or watchpoints.
(gdb) delete breakpoints
(gdb) info breakpoints
No breakpoints or watchpoints.
(gdb) break break2
Breakpoint 2 at 0x85f8: file .../gdb/testsuite/gdb.base/bitfields.c, line 48.
(gdb) entering gdb_reload
target remote localhost:1235
A program is being debugged already. Kill it? (y or n) y
Remote connection closed
.../gdb/target.c:2861: internal-error: could not find a target to follow mourn inferior
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) ^Ccontinue
Please answer y or n.
.../gdb/target.c:2861: internal-error: could not find a target to follow mourn inferior
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) Resyncing due to internal error.
n
.../gdb/target.c:2861: internal-error: could not find a target to follow mourn inferior
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) y
Command aborted.
(gdb) print/x flags
$11 = {uc = 0x0, s1 = 0x0, u1 = 0x0, s2 = 0x0, u2 = 0x0, s3 = 0x0, u3 = 0x0, s9 = 0x0, u9 = 0x0, sc = 0x0}
(gdb) FAIL: gdb.base/bitfields.exp: bitfield containment #1
cont
The program is not being run.
(gdb) FAIL: gdb.base/bitfields.exp: continuing to break2 (the program is no longer running)
print/x flags
$12 = {uc = 0x0, s1 = 0x0, u1 = 0x0, s2 = 0x0, u2 = 0x0, s3 = 0x0, u3 = 0x0, s9 = 0x0, u9 = 0x0, sc = 0x0}
(gdb) FAIL: gdb.base/bitfields.exp: bitfield containment #2
delete breakpoints
Delete all breakpoints? (y or n) y
(gdb) info breakpoints
No breakpoints or watchpoints.
(gdb) delete breakpoints
(gdb) info breakpoints
No breakpoints or watchpoints.
(gdb) break break3
Breakpoint 3 at 0x8604: file .../gdb/testsuite/gdb.base/bitfields.c, line 52.
(gdb) entering gdb_reload
target remote localhost:1236
Remote debugging using localhost:1236
Reading symbols from .../lib/ld-linux.so.3...done.
Loaded symbols for .../lib/ld-linux.so.3
0x41001b80 in _start () from .../lib/ld-linux.so.3
(gdb) continue
Continuing.
Breakpoint 3, break3 () at .../gdb/testsuite/gdb.base/bitfields.c:52
52 }
(gdb) print flags
$13 = {uc = 0 '\000', s1 = 0, u1 = 1, s2 = 0, u2 = 3, s3 = 0, u3 = 7, s9 = 0, u9 = 511, sc = 0 '\000'}
(gdb) PASS: gdb.base/bitfields.exp: unsigned bitfield ranges
gdb/
2013-12-02 Pedro Alves <pedro@codesourcery.com>
Maciej W. Rozycki <macro@codesourcery.com>
* remote.c (putpkt_for_catch_errors): Remove function.
(remote_kill): Handle TARGET_CLOSE_ERROR from the kill packet
gracefully.
The memory management of bp_location->target_info.conditions|tcommands
is currently a little fragile. If the target reports support for
target conditions or commands, and then target side breakpoint support
is disabled, or some error is thrown before remote_add_target_side_XXX
is called, we'll leak these lists. This patch makes us free these
lists when the locations are deleted, and also, just before recreating
the commands|conditions lists.
Tested on x86_64 Fedora 17, native and gdbserver.
gdb/
2013-11-29 Pedro Alves <palves@redhat.com>
* breakpoint.c (build_target_condition_list): Release previous
conditions.
(build_target_command_list): Release previous commands.
(bp_location_dtor): Release target conditions and commands.
* remote.c (remote_add_target_side_condition): Don't release
conditions.
(remote_add_target_side_commands): Don't release commands.
This patch is purely mechanical. It removes gdb_stat.h and changes
the code to use sys/stat.h.
2013-11-18 Tom Tromey <tromey@redhat.com>
* common/gdb_stat.h: Remove.
* ada-lang.c: Use sys/stat.h, not gdb_stat.h.
* common/filestuff.c: Use sys/stat.h, not gdb_stat.h.
* common/linux-osdata.c: Use sys/stat.h, not gdb_stat.h.
* corefile.c: Use sys/stat.h, not gdb_stat.h.
* ctf.c: Use sys/stat.h, not gdb_stat.h.
* darwin-nat.c: Use sys/stat.h, not gdb_stat.h.
* dbxread.c: Use sys/stat.h, not gdb_stat.h.
* dwarf2read.c: Use sys/stat.h, not gdb_stat.h.
* exec.c: Use sys/stat.h, not gdb_stat.h.
* gdbserver/linux-low.c: Use sys/stat.h, not gdb_stat.h.
* gdbserver/remote-utils.c: Use sys/stat.h, not gdb_stat.h.
* inf-child.c: Use sys/stat.h, not gdb_stat.h.
* jit.c: Use sys/stat.h, not gdb_stat.h.
* linux-nat.c: Use sys/stat.h, not gdb_stat.h.
* m68klinux-nat.c: Use sys/stat.h, not gdb_stat.h.
* main.c: Use sys/stat.h, not gdb_stat.h.
* mdebugread.c: Use sys/stat.h, not gdb_stat.h.
* mi/mi-cmd-env.c: Use sys/stat.h, not gdb_stat.h.
* nto-tdep.c: Use sys/stat.h, not gdb_stat.h.
* objfiles.c: Use sys/stat.h, not gdb_stat.h.
* procfs.c: Use sys/stat.h, not gdb_stat.h.
* remote-fileio.c: Use sys/stat.h, not gdb_stat.h.
* remote-mips.c: Use sys/stat.h, not gdb_stat.h.
* remote.c: Use sys/stat.h, not gdb_stat.h.
* rs6000-nat.c: Use sys/stat.h, not gdb_stat.h.
* sol-thread.c: Use sys/stat.h, not gdb_stat.h.
* solib-spu.c: Use sys/stat.h, not gdb_stat.h.
* source.c: Use sys/stat.h, not gdb_stat.h.
* symfile.c: Use sys/stat.h, not gdb_stat.h.
* symmisc.c: Use sys/stat.h, not gdb_stat.h.
* symtab.c: Use sys/stat.h, not gdb_stat.h.
* top.c: Use sys/stat.h, not gdb_stat.h.
* xcoffread.c: Use sys/stat.h, not gdb_stat.h.
This removes gdb_string.h. This patch is purely mechanical. I
created it by running the two commands:
git rm common/gdb_string.h
perl -pi -e's/"gdb_string.h"/<string.h>/;' *.[chyl] */*.[chyl]
2013-11-18 Tom Tromey <tromey@redhat.com>
* common/gdb_string.h: Remove.
* aarch64-tdep.c: Use string.h, not gdb_string.h.
* ada-exp.y: Use string.h, not gdb_string.h.
* ada-lang.c: Use string.h, not gdb_string.h.
* ada-lex.l: Use string.h, not gdb_string.h.
* ada-typeprint.c: Use string.h, not gdb_string.h.
* ada-valprint.c: Use string.h, not gdb_string.h.
* aix-thread.c: Use string.h, not gdb_string.h.
* alpha-linux-tdep.c: Use string.h, not gdb_string.h.
* alpha-mdebug-tdep.c: Use string.h, not gdb_string.h.
* alpha-nat.c: Use string.h, not gdb_string.h.
* alpha-osf1-tdep.c: Use string.h, not gdb_string.h.
* alpha-tdep.c: Use string.h, not gdb_string.h.
* alphanbsd-tdep.c: Use string.h, not gdb_string.h.
* amd64-dicos-tdep.c: Use string.h, not gdb_string.h.
* amd64-linux-nat.c: Use string.h, not gdb_string.h.
* amd64-linux-tdep.c: Use string.h, not gdb_string.h.
* amd64-nat.c: Use string.h, not gdb_string.h.
* amd64-sol2-tdep.c: Use string.h, not gdb_string.h.
* amd64fbsd-tdep.c: Use string.h, not gdb_string.h.
* amd64obsd-tdep.c: Use string.h, not gdb_string.h.
* arch-utils.c: Use string.h, not gdb_string.h.
* arm-linux-nat.c: Use string.h, not gdb_string.h.
* arm-linux-tdep.c: Use string.h, not gdb_string.h.
* arm-tdep.c: Use string.h, not gdb_string.h.
* arm-wince-tdep.c: Use string.h, not gdb_string.h.
* armbsd-tdep.c: Use string.h, not gdb_string.h.
* armnbsd-nat.c: Use string.h, not gdb_string.h.
* armnbsd-tdep.c: Use string.h, not gdb_string.h.
* armobsd-tdep.c: Use string.h, not gdb_string.h.
* avr-tdep.c: Use string.h, not gdb_string.h.
* ax-gdb.c: Use string.h, not gdb_string.h.
* ax-general.c: Use string.h, not gdb_string.h.
* bcache.c: Use string.h, not gdb_string.h.
* bfin-tdep.c: Use string.h, not gdb_string.h.
* breakpoint.c: Use string.h, not gdb_string.h.
* build-id.c: Use string.h, not gdb_string.h.
* buildsym.c: Use string.h, not gdb_string.h.
* c-exp.y: Use string.h, not gdb_string.h.
* c-lang.c: Use string.h, not gdb_string.h.
* c-typeprint.c: Use string.h, not gdb_string.h.
* c-valprint.c: Use string.h, not gdb_string.h.
* charset.c: Use string.h, not gdb_string.h.
* cli-out.c: Use string.h, not gdb_string.h.
* cli/cli-cmds.c: Use string.h, not gdb_string.h.
* cli/cli-decode.c: Use string.h, not gdb_string.h.
* cli/cli-dump.c: Use string.h, not gdb_string.h.
* cli/cli-interp.c: Use string.h, not gdb_string.h.
* cli/cli-logging.c: Use string.h, not gdb_string.h.
* cli/cli-script.c: Use string.h, not gdb_string.h.
* cli/cli-setshow.c: Use string.h, not gdb_string.h.
* cli/cli-utils.c: Use string.h, not gdb_string.h.
* coffread.c: Use string.h, not gdb_string.h.
* common/common-utils.c: Use string.h, not gdb_string.h.
* common/filestuff.c: Use string.h, not gdb_string.h.
* common/linux-procfs.c: Use string.h, not gdb_string.h.
* common/linux-ptrace.c: Use string.h, not gdb_string.h.
* common/signals.c: Use string.h, not gdb_string.h.
* common/vec.h: Use string.h, not gdb_string.h.
* core-regset.c: Use string.h, not gdb_string.h.
* corefile.c: Use string.h, not gdb_string.h.
* corelow.c: Use string.h, not gdb_string.h.
* cp-abi.c: Use string.h, not gdb_string.h.
* cp-support.c: Use string.h, not gdb_string.h.
* cp-valprint.c: Use string.h, not gdb_string.h.
* cris-tdep.c: Use string.h, not gdb_string.h.
* d-lang.c: Use string.h, not gdb_string.h.
* dbxread.c: Use string.h, not gdb_string.h.
* dcache.c: Use string.h, not gdb_string.h.
* demangle.c: Use string.h, not gdb_string.h.
* dicos-tdep.c: Use string.h, not gdb_string.h.
* disasm.c: Use string.h, not gdb_string.h.
* doublest.c: Use string.h, not gdb_string.h.
* dsrec.c: Use string.h, not gdb_string.h.
* dummy-frame.c: Use string.h, not gdb_string.h.
* dwarf2-frame.c: Use string.h, not gdb_string.h.
* dwarf2loc.c: Use string.h, not gdb_string.h.
* dwarf2read.c: Use string.h, not gdb_string.h.
* elfread.c: Use string.h, not gdb_string.h.
* environ.c: Use string.h, not gdb_string.h.
* eval.c: Use string.h, not gdb_string.h.
* event-loop.c: Use string.h, not gdb_string.h.
* exceptions.c: Use string.h, not gdb_string.h.
* exec.c: Use string.h, not gdb_string.h.
* expprint.c: Use string.h, not gdb_string.h.
* f-exp.y: Use string.h, not gdb_string.h.
* f-lang.c: Use string.h, not gdb_string.h.
* f-typeprint.c: Use string.h, not gdb_string.h.
* f-valprint.c: Use string.h, not gdb_string.h.
* fbsd-nat.c: Use string.h, not gdb_string.h.
* findcmd.c: Use string.h, not gdb_string.h.
* findvar.c: Use string.h, not gdb_string.h.
* fork-child.c: Use string.h, not gdb_string.h.
* frame.c: Use string.h, not gdb_string.h.
* frv-linux-tdep.c: Use string.h, not gdb_string.h.
* frv-tdep.c: Use string.h, not gdb_string.h.
* gdb.c: Use string.h, not gdb_string.h.
* gdb_bfd.c: Use string.h, not gdb_string.h.
* gdbarch.c: Use string.h, not gdb_string.h.
* gdbtypes.c: Use string.h, not gdb_string.h.
* gnu-nat.c: Use string.h, not gdb_string.h.
* gnu-v2-abi.c: Use string.h, not gdb_string.h.
* gnu-v3-abi.c: Use string.h, not gdb_string.h.
* go-exp.y: Use string.h, not gdb_string.h.
* go-lang.c: Use string.h, not gdb_string.h.
* go32-nat.c: Use string.h, not gdb_string.h.
* hppa-hpux-tdep.c: Use string.h, not gdb_string.h.
* hppa-linux-nat.c: Use string.h, not gdb_string.h.
* hppanbsd-tdep.c: Use string.h, not gdb_string.h.
* hppaobsd-tdep.c: Use string.h, not gdb_string.h.
* i386-cygwin-tdep.c: Use string.h, not gdb_string.h.
* i386-dicos-tdep.c: Use string.h, not gdb_string.h.
* i386-linux-nat.c: Use string.h, not gdb_string.h.
* i386-linux-tdep.c: Use string.h, not gdb_string.h.
* i386-nto-tdep.c: Use string.h, not gdb_string.h.
* i386-sol2-tdep.c: Use string.h, not gdb_string.h.
* i386-tdep.c: Use string.h, not gdb_string.h.
* i386bsd-tdep.c: Use string.h, not gdb_string.h.
* i386gnu-nat.c: Use string.h, not gdb_string.h.
* i386nbsd-tdep.c: Use string.h, not gdb_string.h.
* i386obsd-tdep.c: Use string.h, not gdb_string.h.
* i387-tdep.c: Use string.h, not gdb_string.h.
* ia64-libunwind-tdep.c: Use string.h, not gdb_string.h.
* ia64-linux-nat.c: Use string.h, not gdb_string.h.
* inf-child.c: Use string.h, not gdb_string.h.
* inf-ptrace.c: Use string.h, not gdb_string.h.
* inf-ttrace.c: Use string.h, not gdb_string.h.
* infcall.c: Use string.h, not gdb_string.h.
* infcmd.c: Use string.h, not gdb_string.h.
* inflow.c: Use string.h, not gdb_string.h.
* infrun.c: Use string.h, not gdb_string.h.
* interps.c: Use string.h, not gdb_string.h.
* iq2000-tdep.c: Use string.h, not gdb_string.h.
* irix5-nat.c: Use string.h, not gdb_string.h.
* jv-exp.y: Use string.h, not gdb_string.h.
* jv-lang.c: Use string.h, not gdb_string.h.
* jv-typeprint.c: Use string.h, not gdb_string.h.
* jv-valprint.c: Use string.h, not gdb_string.h.
* language.c: Use string.h, not gdb_string.h.
* linux-fork.c: Use string.h, not gdb_string.h.
* linux-nat.c: Use string.h, not gdb_string.h.
* lm32-tdep.c: Use string.h, not gdb_string.h.
* m2-exp.y: Use string.h, not gdb_string.h.
* m2-typeprint.c: Use string.h, not gdb_string.h.
* m32c-tdep.c: Use string.h, not gdb_string.h.
* m32r-linux-nat.c: Use string.h, not gdb_string.h.
* m32r-linux-tdep.c: Use string.h, not gdb_string.h.
* m32r-rom.c: Use string.h, not gdb_string.h.
* m32r-tdep.c: Use string.h, not gdb_string.h.
* m68hc11-tdep.c: Use string.h, not gdb_string.h.
* m68k-tdep.c: Use string.h, not gdb_string.h.
* m68kbsd-tdep.c: Use string.h, not gdb_string.h.
* m68klinux-nat.c: Use string.h, not gdb_string.h.
* m68klinux-tdep.c: Use string.h, not gdb_string.h.
* m88k-tdep.c: Use string.h, not gdb_string.h.
* macrocmd.c: Use string.h, not gdb_string.h.
* main.c: Use string.h, not gdb_string.h.
* mdebugread.c: Use string.h, not gdb_string.h.
* mem-break.c: Use string.h, not gdb_string.h.
* memattr.c: Use string.h, not gdb_string.h.
* memory-map.c: Use string.h, not gdb_string.h.
* mep-tdep.c: Use string.h, not gdb_string.h.
* mi/mi-cmd-break.c: Use string.h, not gdb_string.h.
* mi/mi-cmd-disas.c: Use string.h, not gdb_string.h.
* mi/mi-cmd-env.c: Use string.h, not gdb_string.h.
* mi/mi-cmd-stack.c: Use string.h, not gdb_string.h.
* mi/mi-cmd-var.c: Use string.h, not gdb_string.h.
* mi/mi-cmds.c: Use string.h, not gdb_string.h.
* mi/mi-console.c: Use string.h, not gdb_string.h.
* mi/mi-getopt.c: Use string.h, not gdb_string.h.
* mi/mi-interp.c: Use string.h, not gdb_string.h.
* mi/mi-main.c: Use string.h, not gdb_string.h.
* mi/mi-parse.c: Use string.h, not gdb_string.h.
* microblaze-rom.c: Use string.h, not gdb_string.h.
* microblaze-tdep.c: Use string.h, not gdb_string.h.
* mingw-hdep.c: Use string.h, not gdb_string.h.
* minidebug.c: Use string.h, not gdb_string.h.
* minsyms.c: Use string.h, not gdb_string.h.
* mips-irix-tdep.c: Use string.h, not gdb_string.h.
* mips-linux-tdep.c: Use string.h, not gdb_string.h.
* mips-tdep.c: Use string.h, not gdb_string.h.
* mips64obsd-tdep.c: Use string.h, not gdb_string.h.
* mipsnbsd-tdep.c: Use string.h, not gdb_string.h.
* mipsread.c: Use string.h, not gdb_string.h.
* mn10300-linux-tdep.c: Use string.h, not gdb_string.h.
* mn10300-tdep.c: Use string.h, not gdb_string.h.
* monitor.c: Use string.h, not gdb_string.h.
* moxie-tdep.c: Use string.h, not gdb_string.h.
* mt-tdep.c: Use string.h, not gdb_string.h.
* nbsd-tdep.c: Use string.h, not gdb_string.h.
* nios2-linux-tdep.c: Use string.h, not gdb_string.h.
* nto-procfs.c: Use string.h, not gdb_string.h.
* nto-tdep.c: Use string.h, not gdb_string.h.
* objc-lang.c: Use string.h, not gdb_string.h.
* objfiles.c: Use string.h, not gdb_string.h.
* opencl-lang.c: Use string.h, not gdb_string.h.
* osabi.c: Use string.h, not gdb_string.h.
* osdata.c: Use string.h, not gdb_string.h.
* p-exp.y: Use string.h, not gdb_string.h.
* p-lang.c: Use string.h, not gdb_string.h.
* p-typeprint.c: Use string.h, not gdb_string.h.
* parse.c: Use string.h, not gdb_string.h.
* posix-hdep.c: Use string.h, not gdb_string.h.
* ppc-linux-nat.c: Use string.h, not gdb_string.h.
* ppc-sysv-tdep.c: Use string.h, not gdb_string.h.
* ppcfbsd-tdep.c: Use string.h, not gdb_string.h.
* ppcnbsd-tdep.c: Use string.h, not gdb_string.h.
* ppcobsd-tdep.c: Use string.h, not gdb_string.h.
* printcmd.c: Use string.h, not gdb_string.h.
* procfs.c: Use string.h, not gdb_string.h.
* prologue-value.c: Use string.h, not gdb_string.h.
* python/py-auto-load.c: Use string.h, not gdb_string.h.
* python/py-gdb-readline.c: Use string.h, not gdb_string.h.
* ravenscar-thread.c: Use string.h, not gdb_string.h.
* regcache.c: Use string.h, not gdb_string.h.
* registry.c: Use string.h, not gdb_string.h.
* remote-fileio.c: Use string.h, not gdb_string.h.
* remote-m32r-sdi.c: Use string.h, not gdb_string.h.
* remote-mips.c: Use string.h, not gdb_string.h.
* remote-sim.c: Use string.h, not gdb_string.h.
* remote.c: Use string.h, not gdb_string.h.
* reverse.c: Use string.h, not gdb_string.h.
* rs6000-aix-tdep.c: Use string.h, not gdb_string.h.
* ser-base.c: Use string.h, not gdb_string.h.
* ser-go32.c: Use string.h, not gdb_string.h.
* ser-mingw.c: Use string.h, not gdb_string.h.
* ser-pipe.c: Use string.h, not gdb_string.h.
* ser-tcp.c: Use string.h, not gdb_string.h.
* ser-unix.c: Use string.h, not gdb_string.h.
* serial.c: Use string.h, not gdb_string.h.
* sh-tdep.c: Use string.h, not gdb_string.h.
* sh64-tdep.c: Use string.h, not gdb_string.h.
* shnbsd-tdep.c: Use string.h, not gdb_string.h.
* skip.c: Use string.h, not gdb_string.h.
* sol-thread.c: Use string.h, not gdb_string.h.
* solib-dsbt.c: Use string.h, not gdb_string.h.
* solib-frv.c: Use string.h, not gdb_string.h.
* solib-osf.c: Use string.h, not gdb_string.h.
* solib-spu.c: Use string.h, not gdb_string.h.
* solib-target.c: Use string.h, not gdb_string.h.
* solib.c: Use string.h, not gdb_string.h.
* somread.c: Use string.h, not gdb_string.h.
* source.c: Use string.h, not gdb_string.h.
* sparc-nat.c: Use string.h, not gdb_string.h.
* sparc-sol2-tdep.c: Use string.h, not gdb_string.h.
* sparc-tdep.c: Use string.h, not gdb_string.h.
* sparc64-tdep.c: Use string.h, not gdb_string.h.
* sparc64fbsd-tdep.c: Use string.h, not gdb_string.h.
* sparc64nbsd-tdep.c: Use string.h, not gdb_string.h.
* sparcnbsd-tdep.c: Use string.h, not gdb_string.h.
* spu-linux-nat.c: Use string.h, not gdb_string.h.
* spu-multiarch.c: Use string.h, not gdb_string.h.
* spu-tdep.c: Use string.h, not gdb_string.h.
* stabsread.c: Use string.h, not gdb_string.h.
* stack.c: Use string.h, not gdb_string.h.
* std-regs.c: Use string.h, not gdb_string.h.
* symfile.c: Use string.h, not gdb_string.h.
* symmisc.c: Use string.h, not gdb_string.h.
* symtab.c: Use string.h, not gdb_string.h.
* target.c: Use string.h, not gdb_string.h.
* thread.c: Use string.h, not gdb_string.h.
* tilegx-linux-nat.c: Use string.h, not gdb_string.h.
* tilegx-tdep.c: Use string.h, not gdb_string.h.
* top.c: Use string.h, not gdb_string.h.
* tracepoint.c: Use string.h, not gdb_string.h.
* tui/tui-command.c: Use string.h, not gdb_string.h.
* tui/tui-data.c: Use string.h, not gdb_string.h.
* tui/tui-disasm.c: Use string.h, not gdb_string.h.
* tui/tui-file.c: Use string.h, not gdb_string.h.
* tui/tui-layout.c: Use string.h, not gdb_string.h.
* tui/tui-out.c: Use string.h, not gdb_string.h.
* tui/tui-regs.c: Use string.h, not gdb_string.h.
* tui/tui-source.c: Use string.h, not gdb_string.h.
* tui/tui-stack.c: Use string.h, not gdb_string.h.
* tui/tui-win.c: Use string.h, not gdb_string.h.
* tui/tui-windata.c: Use string.h, not gdb_string.h.
* tui/tui-winsource.c: Use string.h, not gdb_string.h.
* typeprint.c: Use string.h, not gdb_string.h.
* ui-file.c: Use string.h, not gdb_string.h.
* ui-out.c: Use string.h, not gdb_string.h.
* user-regs.c: Use string.h, not gdb_string.h.
* utils.c: Use string.h, not gdb_string.h.
* v850-tdep.c: Use string.h, not gdb_string.h.
* valarith.c: Use string.h, not gdb_string.h.
* valops.c: Use string.h, not gdb_string.h.
* valprint.c: Use string.h, not gdb_string.h.
* value.c: Use string.h, not gdb_string.h.
* varobj.c: Use string.h, not gdb_string.h.
* vax-tdep.c: Use string.h, not gdb_string.h.
* vaxnbsd-tdep.c: Use string.h, not gdb_string.h.
* vaxobsd-tdep.c: Use string.h, not gdb_string.h.
* windows-nat.c: Use string.h, not gdb_string.h.
* xcoffread.c: Use string.h, not gdb_string.h.
* xml-support.c: Use string.h, not gdb_string.h.
* xstormy16-tdep.c: Use string.h, not gdb_string.h.
* xtensa-linux-nat.c: Use string.h, not gdb_string.h.
This patch constifies the target_ops method to_detach.
This is a small cleanup, but also, I think, a bug-prevention fix,
since gdb already acts as if the "args" argument here was const.
In particular, top.c:quit_force calls kill_or_detach via
iterate_over_inferiors. kill_or_detach calls target_detach, passing
the same argument each time. So, if one of these methods was not
const-correct, then kill_or_detach would change its behavior in a
strange way.
I could not build every target I modified in this patch. I've
inspected them all by hand, though. Many targets do not use the
"args" parameter; a couple pass it to atoi; and a few pass it on to
the to_detach method of the target beneath. The only code that
required a real change was in linux-nat.c, and that only needed the
introduction of a temporary variable for const-correctness.
2013-11-08 Tom Tromey <tromey@redhat.com>
* aix-thread.c (aix_thread_detach): Update.
* corelow.c (core_detach): Update.
* darwin-nat.c (darwin_detach): Update.
* dec-thread.c (dec_thread_detach): Update.
* gnu-nat.c (gnu_detach): Update.
* go32-nat.c (go32_detach): Update.
* inf-ptrace.c (inf_ptrace_detach): Update.
* inf-ttrace.c (inf_ttrace_detach): Update.
* linux-fork.c (linux_fork_detach): Update.
* linux-fork.h (linux_fork_detach): Update.
* linux-nat.c (linux_nat_detach): Update. Introduce "tem"
local for const-correctness.
* linux-thread-db.c (thread_db_detach): Update.
* monitor.c (monitor_detach): Update.
* nto-procfs.c (procfs_detach): Update.
* procfs.c (procfs_detach): Update.
* record.c (record_detach): Update.
* record.h (record_detach): Update.
* remote-m32r-sdi.c (m32r_detach): Update.
* remote-mips.c (mips_detach): Update.
* remote-sim.c (gdbsim_detach): Update.
* remote.c (remote_detach_1, remote_detach)
(extended_remote_detach): Update.
* sol-thread.c (sol_thread_detach): Update.
* target.c (target_detach): Make "args" const.
(init_dummy_target): Update.
* target.h (struct target_ops) <to_detach>: Make argument const.
(target_detach): Likewise.
* windows-nat.c (windows_detach): Update.
When I do 'si', I find many 'qXfer:traceframe-info:read' packets are sent,
which is not necessary. It slows down the single step.
(gdb) si
Sending packet: $qTStatus#49...Packet received: T0;tnotrun:0;tframes:0;tcreated:0;tfree:500000;tsize:500000;circular:0;disconn:0;starttime:0;stoptime:0;username:;notes::
Sending packet: $Z0,80483c7,1#b4...Packet received: OK
Sending packet: $Z0,4ce5b6b0,1#6e...Packet received: OK
Sending packet: $QPassSignals:e;10;14;17;1a;1b;1c;21;24;25;2c;4c;#5f...Packet received: OK
Sending packet: $vCont;s:p1b15.1b15;c#20...Packet received: T0505:44efffbf;04:44efffbf;08:d1830408;thread:p1b15.1b15;core:3;
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $mbfffef40,40#c0...Packet received: d183040878efffbf2e840408030000000000a040030000000500000070efffbf07000000010000004984040807000000030000000500000000000000b396e84c
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $z0,80483c7,1#d4...Packet received: OK
Sending packet: $z0,4ce5b6b0,1#8e...Packet received: OK
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
Sending packet: $qXfer:traceframe-info:read::0,fff#0b...Packet received: E01
This problem was introduced by this patch
(https://sourceware.org/ml/gdb-patches/2013-04/msg00000.html), in
which get_traceframe_number is not checked before calling
traceframe_available_memory. This patch moves the check to
remote_traceframe_info, say, if GDB doesn't have traceframe selected, GDB
doesn't need to send qXfer:traceframe-info:read packets.
With this patch applied, there is no qXfer:traceframe-info:read sent
out and single step is speed up a little bit.
Here is the experiment I did:
Num of single step Original Patched
single-step cpu_time 10000 8.08 7.57
single-step cpu_time 20000 16.23 14.23
single-step cpu_time 30000 24.19 21.59
single-step cpu_time 40000 32.49 28.0
single-step wall_time 10000 14.1974210739 13.2641420364
single-step wall_time 20000 28.5278921127 25.0541369915
single-step wall_time 30000 42.5864038467 38.0038759708
single-step wall_time 40000 57.2107698917 49.2350611687
single-step vmsize 10000 16128 16388
single-step vmsize 20000 16128 16388
single-step vmsize 30000 16260 16520
single-step vmsize 40000 16444 16704
The patch is tested on x86_64-linux.
gdb:
2013-10-24 Yao Qi <yao@codesourcery.com>
* remote.c (remote_traceframe_info): Return early if
traceframe is not selected.
I realized that remote.c is not validating input here. Currently, if
a remote stub sends in an invalid signal number (or put another way,
if a future stub sends a new signal an old GDB doesn't know about),
GDB will do out of bounds accesses in the
signal_pass/signal_stop/signal_program arrays. It'll probably be a
long while before we add another signal number (and buggy stubs should
just be fixed), but can't hurt to be defensive.
Tested on x86_64 Fedora 17, native gdbserver.
gdb/
2013-10-22 Pedro Alves <palves@redhat.com>
* remote.c (remote_parse_stop_reply) <'T'/'S'/'X' replies>: Map
invalid signal numbers to GDB_SIGNAL_UNKNOWN.
This patch moves pending_event to remote_notif_state. All pending
events are destroyed in remote_notif_state_xfree. However,
discard_pending_stop_replies release pending event too, so the pending
event of stop notification is released twice, we need some refactor
here. We add a new function discard_pending_stop_replies_in_queue
which only discard events in stop_reply_queue, and let
remote_notif_state_xfree release pending event for all notif_client.
After this change, discard_pending_stop_replies is only attached to
ifnerior_exit observer, so the INF can't be NULL any more. The
NULL checking is removed too.
gdb:
2013-10-04 Yao Qi <yao@codesourcery.com>
* remote-notif.h (REMOTE_NOTIF_ID): New enum.
(struct notif_client) <pending_event>: Moved
to struct remote_notif_state.
<id>: New field.
(struct remote_notif_state) <pending_event>: New field.
(notif_event_xfree): Declare.
* remote-notif.c (handle_notification): Adjust.
(notif_event_xfree): New function.
(do_notif_event_xfree): Call notif_event_xfree.
(remote_notif_state_xfree): Call notif_event_xfree to free
each element in field pending_event.
* remote.c (discard_pending_stop_replies): Remove declaration.
(discard_pending_stop_replies_in_queue): Declare.
(remote_close): Call discard_pending_stop_replies_in_queue
instead of discard_pending_stop_replies.
(remote_start_remote): Adjust.
(stop_reply_xfree): Call notif_event_xfree.
(notif_client_stop): Adjust initialization.
(remote_notif_remove_all): Rename it to ...
(remove_stop_reply_for_inferior): ... this. Update comments.
Don't check INF is NULL.
(discard_pending_stop_replies): Return early if notif_state is
NULL. Adjust. Don't check INF is NULL.
(remote_notif_get_pending_events): Adjust.
(discard_pending_stop_replies_in_queue): New function.
(remote_wait_ns): Likewise.
I tried debugging a remote Windows program on Linux host, and pointed the
sysroot to "/some/path/" rather than "remote:", and I found GDB couldn't
find the dlls in the sysroot. If the dll name is
"C:/Windows/system32/ntdll.dll", I end up with the sysroot+in_pathname
concatenated this way:
(top-gdb) p temp_pathname
$1 = 0x228b690 "/some/pathC:/Windows/system32/ntdll.dll"
^^
That is, a directory separator is missing. This is a regression.
The problem is that solib_find decides that since the target path has
a drive spec, a separator is not necessary, which is clearly wrong in
this case. That check was added in
<https://sourceware.org/ml/gdb-patches/2013-06/msg00028.html>, to
handle the case of sysroot being "remote:". This patch fixes that
original issue in a different way. Instead of checking whether the
path has a drive spec, check whether the sysroot is "remote:". The
patch adds a table that helps visualize the cases that need a
separator. I also confirmed the original issue is still handled as
expected. That is, that "set sysroot remote:" still does the right
thing.
remote_filename_p returns true if the filename is prefixed with
"remote:". In this case, we need to check whether the filename is
exactly "remote:". I thought of different ways or either changing
remote_filename_p or adding another convenience function to remote.c
to avoid exposing the "remote:" prefix out of remote.c. But all
attempts turned out adding lot of over needless complication. So the
patch just exposes the prefix behind a new macro, which allows using a
straighforward strcmp.
gdb/
2013-09-27 Pedro Alves <palves@redhat.com>
* remote.h (REMOTE_SYSROOT_PREFIX): New define.
(remote_filename_p): Add comment.
* remote.c (remote_filename_p): Adjust to use
REMOTE_SYSROOT_PREFIX.
* solib.c (solib_find): When deciding whether we need to add a
directory separator, check whether the sysroot is "remote:"
instead of checking whether the patch has a drive spec. Add
comments.
I noticed these fields aren't really necessary -- if the T stop reply
indicated any we have any special event, the fallthrough doesn't
really do anything.
Tested on x86_64 Fedora 17 w/ local gdbserver, and also confirmed
"catch load" against a Windows gdbserver running under Wine, which
exercises TARGET_WAITKIND_LOADED, still works as expected.
gdb/
2013-09-27 Pedro Alves <palves@redhat.com>
* remote.c (struct stop_reply) <solibs_changed, replay_event>:
Delete fields.
(remote_parse_stop_reply): Adjust, setting event->ws.kind
directly.
There's no need for deprecated_xfer_memory nowadays. Memory access
goes through target_xfer_partial/TARGET_OBJECT_MEMORY, etc. In fact,
the remote target already handles that, and is deferring to the same
helpers the deprecated_xfer_memory hook is. Basically, only a few
adjustments to make these helper routines's interfaces closer to
target_xfer_partial's were necessary.
Tested on x86_64 Fedora 17 w/ gdbserver.
gdb/
2013-08-23 Pedro Alves <palves@redhat.com>
* remote.c (remote_write_bytes_aux, remote_write_bytes)
(remote_read_bytes): Change return type to LONGEST, and adjust to
return a target_xfer_error on error.
(remote_xfer_memory): Delete.
(remote_flash_write): Change type of 'ret' local to LONGEST.
(remote_xfer_partial, remote_xfer_partial): Adjust.
(init_remote_ops): Don't install a deprecated_xfer_memory hook.
This moves a few static variables from thread-info functions into
remote_state. Pedro said on irc that these functions implement the
ancient thread-discovery method and that he wouldn't be surprised if
they had rotted; nevertheless it seems safer to me to make them
explicitly per-remote.
This necessitated moving a couple of macros and a typedef earlier in
the file.
* remote.c (struct remote_state) <echo_nextthread, nextthread,
resultthreadlist>: New fields.
(OPAQUETHREADBYTES, threadref, MAXTHREADLISTRESULTS): Move earlier.
(remote_get_threadlist, remote_threadlist_iterator): Use
new fields. Remove static variables.
This moves the globals remote_stopped_by_watchpoint_p and
remote_watch_data_address into remote_state.
* remote.c (struct remote_state) <remote_stopped_by_watchpoint_p,
remote_watch_data_address>: New fields.
(remote_stopped_by_watchpoint_p, remote_watch_data_address): Remove.
(process_stop_reply, remote_wait_as)
(remote_check_watch_resources, remote_stopped_data_address): Update.
The global sizeof_pkt is only used in remote_trace_find, like so:
reply = remote_get_noisy_reply (&(rs->buf), &sizeof_pkt);
I think in this situation it is more correct to use the recorded size
of the buffer. Otherwise it seems that some skew could result.
* remote.c (sizeof_pkt): Remove.
(remote_trace_find): Use rs->buf_size, not sizeof_pkt.
This moves the use_threadextra_query and use_threadinfo_query globals
into remote_state.
* remote.c (struct remote_state) <use_threadinfo_query,
use_threadextra_query>: New fields.
(remote_threads_info, remote_threads_extra_info)
(remote_open_1): Update.
This moves a few static variables out of remote_read_qxfer and into
remote_state.
* remote.c (struct remote_state) <finished_object,
finished_annex, finished_offset>: New fields.
(remote_read_qxfer): Use remote_state fields; remove static
variables.
This moves the global last_sent_step into remote_state.
* remote.c (struct remote_state) <last_sent_step>:
New field.
(last_sent_step): Remove.
(remote_resume, remote_wait_as): Update.
This moves the global last_sent_signal into remote_state.
* remote.c (struct remote_state) <last_sent_signal>:
New field.
(last_sent_signal): Remove.
(new_remote_state, remote_resume, remote_wait_as): Update.
This moves the global last_program_signals_packet into remote_state.
* remote.c (struct remote_state) <last_program_signals_packet>:
New field.
(last_program_signals_packet): Remove.
(remote_program_signals, remote_open_1): Update.
This moves the global last_pass_packet into remote_state.
* remote.c (struct remote_state) <last_pass_packet>:
New field.
(last_pass_packet): Remove.
(remote_pass_signals, remote_open_1): Update.
This moves the global remote_traceframe_number into remote_state.
* remote.c (struct remote_state) <remote_traceframe_number>:
New field.
(remote_traceframe_number): Remove.
(new_remote_state, remote_open_1, set_remote_traceframe)
(remote_trace_find): Update.
Add new_remote_state and change remote_state to be a pointer. This is
a preparatory patch for a later series. It could perhaps be omitted,
but new_remote_state also does some initialization that was previously
done for the globals.
* remote.c (remote_state): Now a pointer.
(get_remote_state_raw): Update.
(new_remote_state): New function.
(_initialize_remote): Use new_remote_state.
gdb has a copy of some CRC code that also appears in libiberty.
This patch just removes the local copy.
You may notice that "crc32" returns unsigned long but "xcrc32" returns
unsigned int. However, this does not matter, because crc32 actually
does all its operations in unsigned int type, and only the return
result is widened. So, the difference does not matter.
* remote.c (crc32_table, crc32): Remove.
(remote_verify_memory): Use xcrc32.
Code cleanup.
* remote.c (cleanup_sigint_signal_handler): Rename the declaration
to ...
(async_cleanup_sigint_signal_handler): ... this.
(initialize_sigint_signal_handler): Remove declaration.
(handle_remote_sigint): Rename the declaration to ...
(async_handle_remote_sigint): ... this.
(handle_remote_sigint_twice): Rename the declaration to ...
(async_handle_remote_sigint_twice): ... this.
(async_remote_interrupt, async_remote_interrupt_twice)
(remote_interrupt): Remove the declarations.
(remote_interrupt_twice): Rename the declaration ...
(sync_remote_interrupt_twice): ... this.
(sigint_remote_twice_token): Rename the variable to ...
(async_sigint_remote_twice_token): ... this.
(sigint_remote_token): Rename the variable to ...
(async_sigint_remote_token): ... this.
(initialize_sigint_signal_handler): Rename the function to ...
(async_initialize_sigint_signal_handler): ... this. Update the name
inside.
(handle_remote_sigint): Rename the function to ...
(async_handle_remote_sigint): ... this. Update the names inside.
(handle_remote_sigint_twice): Rename the function to ...
(async_handle_remote_sigint_twice): ... this. Update the names inside.
(cleanup_sigint_signal_handler): Rename the function to ...
(async_cleanup_sigint_signal_handler): ... this.
(remote_interrupt): Rename the function to ...
(sync_remote_interrupt): this. Update the names inside.
(remote_interrupt_twice): Rename the function to ...
(sync_remote_interrupt_twice): this. Update the names inside.
(remote_terminal_inferior, remote_terminal_ours, remote_wait_as)
(_initialize_remote): Update the names inside.
2013-06-26 Pedro Alves <pedro@codesourcery.com>
Yao Qi <yao@codesourcery.com>
* gdb.texinfo (GDB/MI Tracepoint Commands): Document
-trace-frame-collected.
gdb:
2013-06-26 Pedro Alves <pedro@codesourcery.com>
Yao Qi <yao@codesourcery.com>
* mi/mi-cmds.c (mi_cmds): Register -trace-frame-collected.
* mi/mi-cmds.h (mi_cmd_trace_frame_collected): Declare.
* mi/mi-main.c (print_variable_or_computed): New function.
(mi_cmd_trace_frame_collected): New function.
* tracepoint.c (find_trace_state_variable_by_number): New.
(struct traceframe_info): Move to tracepoint.h
(struct collection_list): Likewise.
(do_collect_symbol): Include locals and arguments in the wholly
collected variables list.
(clear_collection_list): Clear wholly collected variables list
and computed variables list.
(append_exp): New function.
(encode_actions_1): Include variables in the wholly
collected variables list. Include memory ranges and
full-fledged expressions in the computed expressions list.
(encode_actions): Move some code to ...
Return the cleanup chain.
(encode_actions_rsp): ... here. New function.
(get_traceframe_location, get_traceframe_info): Remove static.
* tracepoint.h (struct memrange): Moved from tracepoint.c.
(struct collection_list): Moved from tracepoint.c. Add two
new fields 'wholly_collected' and 'computed'.
(find_trace_state_variable_by_number): Declare.
(encode_actions): Adjust declaration.
(encode_actions_rsp): Declare.
(get_traceframe_info, get_traceframe_location): Declare.
* NEWS: Mention new MI command -trace-frame-collected.
In extended-remote, when GDB connects the target, but target is not
running, the TSVs are not uploaded. When GDB attaches to a process,
the TSVs are not uploaded either. However, GDBserver has some
builtin or predefined TSV to upload, such as $trace_timestamp. This
bug causes $trace_timestamp is never uploaded.
gdb/
2013-06-25 Yao Qi <yao@codesourcery.com>
* remote.c (remote_start_remote): Move code to upload tsv
earlier.
gdb/testsuite/
2013-06-25 Yao Qi <yao@codesourcery.com>
* boards/native-extended-gdbserver.exp: Set board_info
'gdb,predefined_tsv'.
* boards/native-gdbserver.exp: Likewise.
* boards/native-stdio-gdbserver.exp: Likewise.
* gdb.server/ext-attach.exp: Load trace-support.exp. Check
uploaded TSVs if target supports tracing.
* gdb.trace/tsv.exp: Check uploaded TSVs if target supports
tracing and target has predefined tsv.
gdb/doc/
2013-06-25 Yao Qi <yao@codesourcery.com>
* gdbint.texinfo (Testsuite): Document 'gdb,predefined_tsv'.
was received. This patch fixes it.
2013-06-04 Sergio Durigan Junior <sergiodj@redhat.com>
Pedro Alves <palves@redhat.com>
* remote.c (remote_wait_as): Restore signal handler before returning
when GDB gets a notification.
* target.h (target_ops): New field
"to_augmented_libraries_svr4_read".
(target_augmented_libraries_svr4_read): New macro.
* target.c (update_current_target): Handle
to_augmented_libraries_svr4_read.
* remote.c (remote_state): New field
"augmented_libraries_svr4_read".
(remote_augmented_libraries_svr4_read_feature): New function.
(remote_protocol_features): Add entry for
"augmented-libraries-svr4-read".
(remote_augmented_libraries_svr4_read): New function.
(init_remote_ops): Initialize
remote_ops.to_augmented_libraries_svr4_read.
I noticed that gdb.multi/multi-arch.exp wasn't passing with
extended-remote GDBserver with my pending multi-process+multi-arch
series anymore on current mainline, while it used to pass before:
(gdb) run
Starting program: /home/pedro/gdb/mygit/build/gdb/testsuite/gdb.multi/ma-hangout
Process /home/pedro/gdb/mygit/build/gdb/testsuite/gdb.multi/ma-hangout created; pid = 32067
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x4005c2: Unknown error -1.
Cannot insert breakpoint -1.
Temporarily disabling shared library breakpoints:
breakpoint #-1
(gdb) FAIL: gdb.multi/multi-arch.exp: starting inferior 2
Investigating manually, I found an easy way to reproduce. You just
need breakpoints on distinct inferiors, and a way to have GDB install
them in one go:
(gdb) set breakpoint always-inserted on
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint del n <MULTIPLE>
2.1 y 0x00000000004005c2 in main at ../../../src/gdb/testsuite/gdb.multi/hello.c:40 inf 1
2.2 y 0x08048475 in main at ../../../src/gdb/testsuite/gdb.multi/hangout.c:22 inf 2
(gdb) enable 2
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x4005c2: Unknown error -1.
And turning on remote debugging, we see:
(gdb) set debug remote 1
(gdb) disable 2
(gdb) enable 2
Sending packet: $Z0,4005c2,1#71...Packet received: E01
Sending packet: $Z0,8048475,1#87...Packet received: OK
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x4005c2: Unknown error -1.
Notice that each of those Z0 breakpoints should be set in different
processes. However, no Hg packet to select a process has been sent in
between, so GDBserver tries to plant both on the same process that
happens to be current. The first Z0 then not so surprisingly fails.
IOW, the blame is on GDB, for telling GDBserver to plant both
breakpoints in the same process.
remote.c has a lazy scheme where it keeps a local cache of the
remote's selected general thread, and delays updating it on the remote
side until necessary (memory/register reads/writes, etc.). This is
done to reduce RSP traffic. The bug is that the Zx breakpoint
insert/remove methods weren't committing the selected thread/process
back to the remote side:
Breakpoint 3, remote_insert_breakpoint (gdbarch=0x1383ae0, bp_tgt=0x140c2b0) at ../../src/gdb/remote.c:8148
8148 if (remote_protocol_packets[PACKET_Z0].support != PACKET_DISABLE)
(top-gdb) p inferior_ptid
$3 = {pid = 3670, lwp = 0, tid = 3670}
(top-gdb) p general_thread
$4 = {pid = 3671, lwp = 0, tid = 3671}
IOW, a call to set_general_process is missing.
I did some auditing over remote.c, and added calls to all places I
found missing it.
This only used to work by chance before. breakpoint.c switches to a
thread of the target process before installing a breakpoint location.
That calls switch_to_thread. Before:
2012-07-27 Yao Qi <yao@codesourcery.com>
* thread.c (switch_to_thread): Don't call registers_changed.
that caused the register caches to all be flushed and refetched before
installing the breakpoint location. Given fetching registers commits
the remote general thread (with Hg), masking out the latent bug.
Tested on x86_64 Fedora 17 with GDBserver.
gdb/
2013-05-29 Pedro Alves <palves@redhat.com>
* remote.c (remote_insert_breakpoint, remote_remove_breakpoint)
(remote_insert_watchpoint, remote_remove_watchpoint)
(remote_insert_hw_breakpoint, remote_remove_hw_breakpoint)
(remote_verify_memory, compare_sections_command)
(remote_search_memory): Set the general process/thread on the
remote side.
This patch teaches GDB to take advantage of target-assisted range
stepping. It adds a new 'r ADDR1,ADDR2' action to vCont (vCont;r),
meaning, "step once, and keep stepping as long as the thread is in the
[ADDR1,ADDR2) range".
Rationale:
When user issues the "step" command on the following line of source,
a = b + c + d * e - a;
GDB single-steps every single instruction until the program reaches a
new different line. E.g., on x86_64, that line compiles to:
0x08048434 <+65>: mov 0x1c(%esp),%eax
0x08048438 <+69>: mov 0x30(%esp),%edx
0x0804843c <+73>: add %eax,%edx
0x0804843e <+75>: mov 0x18(%esp),%eax
0x08048442 <+79>: imul 0x2c(%esp),%eax
0x08048447 <+84>: add %edx,%eax
0x08048449 <+86>: sub 0x34(%esp),%eax
0x0804844d <+90>: mov %eax,0x34(%esp)
0x08048451 <+94>: mov 0x1c(%esp),%eax
and the following is the RSP traffic between GDB and GDBserver:
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:3c840408;thread:p2e13.2e13;core:1;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:3e840408;thread:p2e13.2e13;core:2;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:42840408;thread:p2e13.2e13;core:2;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:47840408;thread:p2e13.2e13;core:0;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:49840408;thread:p2e13.2e13;core:0;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:4d840408;thread:p2e13.2e13;core:0;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:51840408;thread:p2e13.2e13;core:0;
IOW, a lot of roundtrips between GDB and GDBserver.
If we add a new command to the RSP, meaning "keep stepping and don't
report a stop until the program goes out of the [0x08048434,
0x08048451) address range", then the RSP traffic can be reduced down
to:
--> vCont;r8048434,8048451:p2db0.2db0;c
<-- T0505:68efffbf;04:30efffbf;08:51840408;thread:p2db0.2db0;core:1;
As number of packets is reduced dramatically, the performance of
stepping source lines is much improved.
In case something is wrong with range stepping on the stub side, the
debug info or even gdb, this adds a "set/show range-stepping" command
to be able to turn range stepping off.
gdb/
2013-05-23 Yao Qi <yao@codesourcery.com>
Pedro Alves <palves@redhat.com>
* gdbthread.h (struct thread_control_state) <may_range_step>: New
field.
* infcmd.c (step_once, until_next_command): Enable range stepping.
* infrun.c (displaced_step_prepare): Disable range stepping.
(resume): Disable range stepping if stepping over a breakpoint or
we have software watchpoints. If range stepping is enabled,
assert the thread is in the stepping range.
(clear_proceed_status_thread): Clear may_range_step.
(handle_inferior_event): Disable range stepping as soon as we know
the thread that hit the event. Re-enable it whenever we're going
to step with a step range.
* remote.c (struct vCont_action_support) <r>: New field.
(use_range_stepping): New global.
(remote_vcont_probe): Handle 'r' action.
(append_resumption): Append an 'r' action if the thread may range
step.
(show_range_stepping): New function.
(set_range_stepping): New function.
(_initialize_remote): Call add_setshow_boolean_cmd to register the
'set range-stepping' and 'show range-stepping' commands.
* NEWS: Mention range stepping, the new vCont;r action, and the
new "set/show range-stepping" commands.
gdb/doc/
2013-05-23 Yao Qi <yao@codesourcery.com>
Pedro Alves <palves@redhat.com>
* gdb.texinfo (Packets): Document 'vCont;r'.
(Continuing and Stepping): Document target-assisted range
stepping, and the 'set range-stepping' and 'show range-stepping'
commands.
Convert the 'support_vCont_t' int field to a struct, in preparation
for adding more fields to it.
gdb/
2013-05-23 Yao Qi <yao@codesourcery.com>
Pedro Alves <palves@redhat.com>
* remote.c (struct vCont_action_support): New struct.
(struct remote_state) <support_vCont_t>: Remove field.
<vCont_actions_support>: New field.
(remote_vcont_probe, remote_stop_ns): Update.
Tom Tromey