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The file gdbserver/ax.h contains:
...
#ifdef IN_PROCESS_AGENT
#define debug_threads debug_agent
#endif
...
but does not declare debug_agent.
Fix this by adding an include of gdbsupport/agent.h.
[ If this fix would have been in place before commit 8118159c69 "[gdbserver] Fix
Wlto-type-mismatch for debug_agent", we would have simply run into this build
breaker with a regular, non-lto build:
...
src/gdbserver/ax.cc:28:5: error: conflicting declaration 'int debug_agent'
int debug_agent = 0;
^~~~~~~~~~~
In file included from src/gdbserver/ax.h:25:0,
from src/gdbserver/ax.cc:20:
src/gdbsupport/agent.h:47:13: note: previous declaration as 'bool debug_agent'
extern bool debug_agent;
^~~~~~~~~~~
... ]
Tested on x86_64-linux.
gdbserver/ChangeLog:
2020-06-29 Tom de Vries <tdevries@suse.de>
* ax.h: Include gdbsupport/debug_agent.h.
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The gdbsupport directory contains a helper class print_xml_feature
that is shared between gdb and gdbserver. This class is used for
printing an XML representation of a target_desc object.
Currently this class doesn't have the ability to print the
<compatible> entities that can appear within a target description, I
guess no targets have needed that functionality yet.
The print_xml_feature classes API is based around operating on the
target_desc class, however, the sharing between gdb and gdbserver is
purely textural, we rely on their being a class called target_desc in
both gdb and gdbserver, but there is no shared implementation. We
then have a set of functions declared that operate on an object of
type target_desc, and again these functions have completely separate
implementations.
Currently then the gdb version of target_desc contains a vector of
bfd_arch_info pointers which represents the compatible entries from a
target description. The gdbserver version of target_desc has no such
information. Further, the gdbserver code doesn't seem to include the
bfd headers, and so doesn't know about the bfd types.
I was reluctant to include the bfd headers into gdbserver just so I
can reference the compatible information, which isn't (currently) even
needed in gdbserver.
So, the approach I take in this patch is to wrap the compatible
information into a new helper class. This class is declared in the
gdbsupport library, but implemented separately in both gdb and
gdbserver.
In gdbserver the class is empty. The compatible information within
the gdbserver is an empty list, of empty classes.
In gdb the class contains a pointer to the bfd_arch_info object.
With this in place we can now add support to print_xml_feature for
printing the compatible information if it is present. In the
gdbserver code this will never happen, as the gdbserver never has any
compatible information. But in gdb, this code will trigger when
appropriate.
gdb/ChangeLog:
* target-descriptions.c (class tdesc_compatible_info): New class.
(struct target_desc): Change type of compatible vector.
(tdesc_compatible_p): Update for change in type of
target_desc::compatible.
(tdesc_compatible_info_list): New function.
(tdesc_compatible_info_arch_name): New function.
(tdesc_add_compatible): Update for change in type of
target_desc::compatible.
(print_c_tdesc::visit_pre): Likewise.
gdbserver/ChangeLog:
* tdesc.cc (struct tdesc_compatible_info): New struct.
(tdesc_compatible_info_list): New function.
(tdesc_compatible_info_arch_name): New function.
gdbsupport/ChangeLog:
* tdesc.cc (print_xml_feature::visit_pre): Print compatible
information.
* tdesc.h (struct tdesc_compatible_info): Declare new struct.
(tdesc_compatible_info_up): New typedef.
(tdesc_compatible_info_list): Declare new function.
(tdesc_compatible_info_arch_name): Declare new function.
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Use std::list to store pending signals instead of a manually-managed
linked list. This is a refactoring.
In the existing code, pending signals are kept in a manually-created
linked list with "prev" pointers. A new pending signal is thus
inserted to the beginning of the list. When consuming, GDB goes until
the end of the list, following the "prev" pointers, and processes the
final item. With this patch, a new item is added to the end of the
list and the item at the front of the list is consumed. In other
words, the list elements used to be stored in reverse order; with this
patch, they are stored in their order of arrival. This causes a change
in the debug messages that print the pending signals. Otherwise, no
behavioral change is expected.
gdbserver/ChangeLog:
2020-06-22 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
Use std::list to stop pending signal instead of manually-created
linked list.
* linux-low.h: Include <list>.
(struct pending_signal): Move here from linux-low.cc.
(struct lwp_info) <pending_signals>
<pending_signals_to_report>: Update the type.
* linux-low.cc (struct pending_signals): Remove.
(linux_process_target::delete_lwp)
(linux_process_target::add_lwp)
(enqueue_one_deferred_signal)
(dequeue_one_deferred_signal)
(enqueue_pending_signal)
(linux_process_target::resume_one_lwp_throw)
(linux_process_target::thread_needs_step_over)
(linux_process_target::resume_one_thread)
(linux_process_target::proceed_one_lwp): Update the use of pending
signal list.
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This patch removes the leftover regformats .dat files for the arm
architecture. There are no longer relevant, since the arm architecture
has been converted to use feature-based target-descriptions. These .dat
files are used by GDBserver ports that still use static target
descriptions.
These .dat files are generated from corresponding .xml files in the
features directory. And since the corresponding .xml files for these
arm .dat files don't exist anymore, it is impossible to re-generated
them. If you delete these .dat files and type "make" in the features
directory, you'll get:
make: *** No rule to make target '../regformats/arm/arm-with-iwmmxt.dat', needed by 'all'. Stop.
So it removes the entries in the `WHICH` variable of
gdb/features/Makefile.
Finally, it removes the rule in gdbserver/Makefile to generate .cc files
from `../gdb/regformats/arm/%.dat`.
gdb/ChangeLog:
* features/Makefile (WHICH): Remove arm files.
* regformats/arm/arm-with-iwmmxt.dat: Remove.
* regformats/arm/arm-with-neon.dat: Remove.
* regformats/arm/arm-with-vfpv2.dat: Remove.
* regformats/arm/arm-with-vfpv3.dat: Remove.
gdbserver/ChangeLog:
* Makefile.in (%-generated.cc: ../gdb/regformats/arm/%.dat):
Remove.
Change-Id: I3b7d989c50e2cb92235c1f7c7071a26839d84c78
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This port has been unmaintained for years, remove it.
gdbserver/ChangeLog:
* Makefile.in (SFILES): Remove win32-arm-low.cc, wincecompat.cc.
* configure.srv: Remove mingw32ce cases.
* server.h, win32-low.cc: Remove __MINGW32CE__-guarded code.
* win32-low.h (to_back_slashes): Remove.
* win32-arm-low.cc, wincecompat.cc, wincecompat.h: Remove.
Change-Id: Ib75c0b55b0ab7caca38bbeff5f2fa9397a8e7e8d
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This port has been unmaintained for years and the upstream Linux kernel
does not support this architecture anymore, remove it.
gdbserver/ChangeLog:
* Makefile.in (SFILES): linux-tile-low.cc.
* configure.srv: Remove tilegx case.
* linux-tile-low.cc: Remove.
Change-Id: I1c2910d04ddbd6013e5d228047106b41d80f9477
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This port has been unmaintained for years and the upstream Linux kernel
does not support this architecture anymore, remove it.
gdbserver/ChangeLog:
* Makefile.in (SFILES): Remove linux-m32r-low.cc.
* configure.srv: Remove m32r case.
* linux-m32r-low.cc: Remove.
Change-Id: I5617b2b1fd92aeec19b38e0e3c0b78adaafdb35b
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This port has been unmaintained for years and the upstream Linux kernel
does not support this architecture anymore, remove it.
gdbserver/ChangeLog:
* Makefile.in (SFILES): Remove linux-cris-low.c.
* configure.srv: Remove cris cases.
* linux-cris-low.cc, linux-crisv32-low.cc: Remove.
Change-Id: Ib3ff436b03373548215f15540a47f39cbec5f512
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This port has been unmaintained for years and the upstream Linux kernel
does not support this architecture anymore, remove it.
gdbserver/ChangeLog:
* Makefile.in (SFILES): Remove linux-bfin-low.c.
* configure.srv: Remove bfin case.
* linux-bfin-low.cc: Remove.
* linux-low.cc: Remove BFIN-conditional code.
Change-Id: I846310d15e6386118ec7eabb1b87e647174560fb
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This port has been unmaintained for years, remove it.
gdbserver/ChangeLog:
* configure: Re-generate.
* configure.ac: Remove srv_qnx test.
* configure.srv: Remove nto case.
* nto-low.cc, nto-low.h, nto-x86-low.cc: Remove.
* remote-utils.c: Remove __QNX__-guarded code.
Change-Id: I8a1ad9c740a69352da1f6993778dbf951eebb22f
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This port has been unmaintained for years, remove it.
gdbserver/ChangeLog:
* configure: Re-generate.
* configure.ac: Remove srv_lynxos test.
* configure.srv: Remove lynxos cases.
* lynx-i386-low.cc, lynx-low.cc, lynx-low.h, lynx-ppc-low.c:
Remove.
Change-Id: I239d1cf1fc7b4c7a174251bc7981707eaba7d972
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Fix a few outdated or incoherent things in the README:
- Don't mention remote.c nor *-stub.c files as references for the remote
protocol. remote.c is in GDB, not GDBserver, and *-stub.c files don't
exist today. Add a link to the documentation instead.
- In the "server (target) side" section, use `:2345` instead of
`host:2345`. It currently says that using `host:2345` means we would
expect a connection from `host`. That's not what I would expect by
passing a host part here. If I passed `11.22.33.44:2345` as the listen
address, I would expect it to instruct gdbserver to listen only on that
(11.22.33.44) network interface, not to expect a connection from host
`11.22.33.44`. So, remove that part of the sentence.
- Remove the list of supported target, refer to configure.srv instead.
Keeping a list here is bound to lose sync with reality.
- In the cross-compile instructions, I don't think it's necessary to mention
"In a Bourne shell".
- In the cross-compile instructions, I don't know what passing
`your-target-name` to configure does, I don't think it's valid. Use
`make all-gdbserver` as in the instructions just above.
gdbserver/ChangeLog:
* README: Fix a few outdated or incoherent things.
Change-Id: I79349e25bc1bc53447855e0dea6cc7b9630f4553
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Only the process handle returned by OpenProcess or CreateProcess needs to
be closed, the one provided by WaitForDebugEvent is closed automatically.
gdbserver/ChangeLog:
2020-05-27 Hannes Domani <ssbssa@yahoo.de>
* win32-low.cc (do_initial_child_stuff): Set open_process_used.
(win32_clear_inferiors): Use open_process_used.
(get_child_debug_event): Likewise.
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Use the construct_inferior_arguments function instead of
stringify_argv to construct a string from the program
arguments in those places where that one is then passed
to fork_inferior (linux-low, lyn-low), since
construct_inferior_arguments properly takes care of
special characters, while stringify_argv does not.
Using construct_inferior_arguments seems "natural", since its
documentation also mentions that it "does the
same shell processing as fork_inferior".
Since construct_inferior_args has been extended to do
proper quoting for Windows shells in commit
5d60742e2dd3c9b475dce54b56043a358751bbb8
("Fix quoting of special characters for the MinGW build.",
2012-06-12), use it for the Windows case as well.
(I could not test that case myself, though.)
Adapt handling of empty args in function 'handle_v_run'
in gdbserver/server.cc to just insert an empty string
for an empty arg, since that one is now properly handled
in 'construct_inferior_arguments' already (and inserting
a "''" string in 'handle_v_run' would otherwise
cause that one to be treated as a string literally
containing two quote characters, which
'construct_inferior_args' would preserve by adding
extra escaping).
This makes gdbserver properly handle program args containing special
characters (like spaces), e.g. (example from PR25893)
$ gdbserver localhost:50505 myprogram "hello world"
now properly handles "hello world" as a single arg, not two separate
ones ("hello", "world").
gdbserver/ChangeLog:
PR gdbserver/25893
* linux-low.cc (linux_process_target::create_inferior),
lynx-low.cc (lynx_process_target::create_inferior),
win32-low.cc (win32_process_target::create_inferior): Use
construct_inferior_arguments instead of stringify_argv
to get string representation which properly escapes
special characters.
* server.cc (handle_v_run): Just pass empty program arg
as such, since any further processing is now handled via
construct_inferior_arguments.
Change-Id: Ibf963fcd51415c948840fb463289516b3479b0c3
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According to [1], the fifth parameter
to the 'spawnp' function is 'char * const argv[]',
so just pass the args contained in the vector as
an array right away, rather than converting that
to a C string first and passing that one.
With commit 2090129c36c7e582943b7d300968d19b46160d84
("Share fork_inferior et al with gdbserver",
2016-12-22) the type had changed from 'char **'
to 'char *', but I can't see an apparent reason for
that, and 'nto_procfs_target::create_inferior'
(in gdb/nto-procfs.c) also passes a 'char **' to
'spawnp' instead.
I do not know much about that target and cannot actually
test this, however.
The main motivation to look at this was identifying
and replacing the remaining uses of the 'stringify_argv'
function which does not properly do escaping.
[1] http://www.qnx.com/developers/docs/7.0.0/#com.qnx.doc.neutrino.lib_ref/topic/s/spawnp.html
gdbserver/ChangeLog:
* nto-low.cc (nto_process_target::create_inferior): Pass
argv to spawnp function as char **.
Change-Id: Ic46fe745c2aa1118114240d149d4156032f84344
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The vector holding the program args is passed as a parameter
to target_create_inferior, which then passes it to
stringify_argv for all platforms, where any NULL entry in
the vector is ignored, so there seems to be no reason
to actually add one after all.
(Since the intention is to replace uses of stringify_argv with
construct_inferior_arguments in a follow-up commit and that
function doesn't currently handle such NULL arguments, it
would otherwise have to be extended.)
gdbserver/ChangeLog:
* server.cc (captured_main), (handle_v_run): No longer
insert extra NULL element to args vector.
Change-Id: Ia2ef6d36814a6b11ce8b0d6e3b33248a7945e825
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This patch avoids depending on the current locale when parsing &
comparing symbol names, by using libiberty's safe-ctype.h uppercase
TOLOWER, ISXDIGIT, etc. macros instead of the standard ctype.h
tolower, isxdigit, etc. macros/functions.
This commit:
commit b1b60145aedb8adcb0b9dcf43a5ae735c2f03b51
Author: Pedro Alves <palves@redhat.com>
AuthorDate: Tue May 22 17:35:38 2018 +0100
Support UTF-8 identifiers in C/C++ expressions (PR gdb/22973)
did something similar, except in the expression parser.
This can improve GDB's symbol loading performance significantly.
Currently strcmp_iw_ordered can show up high on profiles (called from
sort_pst_symbols -> std::sort) because of the isspace and tolower
functions. Hannes mentions seeing it as high as in ~24% of the
profiling samples on Windows
(https://sourceware.org/pipermail/gdb-patches/2020-May/168858.html).
I tested GDB's performance (built with "-g -O2") loading a "-g -O0"
build of gdb.
I ran GDB 10 times like:
/bin/time -f %e \
./gdb/gdb --data-directory ./gdb/data-directory -nx \
-batch /tmp/gdb-g-O0
Then I computed the mean time.
The baseline mean time was
gdb 2.515
This patch brings the number down to
gdb 2.096
Which is an around 16% improvement.
gdb/ChangeLog:
2020-05-23 Pedro Alves <palves@redhat.com>
* utils.c: Include "gdbsupport/gdb-safe-ctype.h".
(parse_escape): Use ISDIGIT instead of isdigit.
(puts_debug): Use gdb_isprint instead of isprint.
(fprintf_symbol_filtered): Use ISALNUM instead of isalnum.
(cp_skip_operator_token, skip_ws, strncmp_iw_with_mode): Use
ISSPACE instead of isspace.
(strncmp_iw_with_mode): Use TOLOWER instead of tolower and ISSPACE
instead of isspace.
(strcmp_iw_ordered): Use ISSPACE instead of isspace.
(string_to_core_addr): Use TOLOWER instead of tolower, ISXDIGIT
instead of isxdigit and ISDIGIT instead of isdigit.
gdbsupport/ChangeLog:
2020-05-23 Pedro Alves <palves@redhat.com>
* gdb-safe-ctype.h: New.
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During the gdbserver c++'ification refactoring, I apparently made a
typo that broke build in ia64 targets.
gdbserver/ChangeLog:
2020-05-16 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* linux-ia64-low.cc (ia64_target::sw_breakpoint_from_kind):
Fix incorrect 'gdb_assert_no_reached' to 'gdb_assert_not_reached'.
(ia64_target::low_breakpoint_at): Ditto.
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When trying to use hardware breakpoints with gdbserver you get this error:
(gdb) hbreak main
Hardware assisted breakpoint 2 at 0x40162d: file gdb-9493.c, line 5.
(gdb) c
Continuing.
Warning:
Cannot insert hardware breakpoint 2.
Could not insert hardware breakpoints:
You may have requested too many hardware breakpoints/watchpoints.
It turns out the respective types just needed to be added to the
appropriate callback functions, because x86_dr_(insert|remove)_watchpoint
already handles them.
gdbserver/ChangeLog:
2020-05-15 Hannes Domani <ssbssa@yahoo.de>
* win32-i386-low.cc (i386_supports_z_point_type): Handle
Z_PACKET_HW_BP z_type.
(i386_insert_point): Handle raw_bkpt_type type.
(i386_remove_point): Likewise.
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gdbserver/ChangeLog:
2020-04-30 Hannes Domani <ssbssa@yahoo.de>
* configure.srv <x86_64-*-mingw*, x86_64-*-cygwin*> (srv_tgtobj):
Add arch/i386.o.
* win32-arm-low.cc (arm_num_regs): New function.
(struct win32_target_ops): Use arm_num_regs.
* win32-i386-low.cc (win32_get_current_dr): Adapt for WOW64
processes.
(i386_get_thread_context): Likewise.
(i386_prepare_to_resume): Likewise.
(i386_thread_added): Likewise.
(i386_single_step): Likewise.
(i386_fetch_inferior_register): Likewise.
(i386_store_inferior_register): Likewise.
(i386_arch_setup): Likewise.
(i386_win32_num_regs): New function.
(struct win32_target_ops): Use i386_win32_num_regs.
* win32-low.cc (win32_get_thread_context): Adapt for WOW64
processes.
(win32_require_context): Likewise.
(child_add_thread): Likewise.
(do_initial_child_stuff): Likewise.
(continue_one_thread): Likewise.
(win32_process_target::resume): Likewise.
(load_psapi): Likewise.
(win32_add_all_dlls): Likewise.
(maybe_adjust_pc): Likewise.
(win32_process_target::qxfer_siginfo): Likewise.
(initialize_low): Likewise.
* win32-low.h (struct win32_target_ops): Change num_regs to
callback function.
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I recently stumbled on this code mentioning Linux kernel 2.6.25, and
thought it could be time for some spring cleaning (newer GDBs probably
don't need to supports 12-year old kernels). I then found that the
"legacy" case is probably broken anyway, which gives an even better
motivation for its removal.
In short, this patch removes the configure checks that check if
user_regs_struct contains the fs_base/gs_base fields and adjusts all
uses of the HAVE_STRUCT_USER_REGS_STRUCT_{FS,GS}_BASE macros. The
longer explanation/rationale follows.
Apparently, Linux kernels since 2.6.25 (that's from 2008) have been
reliably providing fs_base and gs_base as part of user_regs_struct.
Commit df5d438e33d7 in the Linux kernel [1] seems related. This means
that we can get these values by reading registers with PTRACE_GETREGS.
Previously, these values were obtained using a separate
PTRACE_ARCH_PRCTL ptrace call.
First, I'm not even sure the configure check was really right in the
first place.
The user_regs_struct used by GDB comes from
/usr/include/x86_64-linux-gnu/sys/user.h (or equivalent on other
distros) and is provided by glibc. glibc has had the fs_base/gs_base
fields in there for a very long time, at least since this commit from
2001 [2]. The Linux kernel also has its version of user_regs_struct,
which I think was exported to user-space at some point. It included the
fs_base/gs_base fields since at least this 2002 commit [3]. In any
case, my conclusion is that the fields were there long before the
aforementioned Linux kernel commit. The kernel commit didn't add these
fields, it only made sure that they have reliable values when obtained
with PTRACE_GETREGS.
So, checking for the presence of the fs_base/gs_base fields in struct
user_regs_struct doesn't sound like a good way of knowing if we can
reliably get the fs_base/gs_base values from PTRACE_GETREGS. My guess
is that if we were using that strategy on a < 2.6.25 kernel, things
would not work correctly:
- configure would find that the user_regs_struct has the fs_base/gs_base
fields (which are probided by glibc anyway)
- we would be reading the fs_base/gs_base values using PTRACE_GETREGS,
for which the kernel would provide unreliable values
Second, I have tried to see how things worked by forcing GDB to not use
fs_base/gs_base from PTRACE_GETREGS (forcing it to use the "legacy"
code, by configuring with
ac_cv_member_struct_user_regs_struct_gs_base=no ac_cv_member_struct_user_regs_struct_fs_base=no
Doing so breaks writing registers back to the inferior. For example,
calling an inferior functions gives an internal error:
(gdb) p malloc(10)
/home/smarchi/src/binutils-gdb/gdb/i387-tdep.c:1408: internal-error: invalid i387 regnum 152
The relevant last frames where this error happens are:
#8 0x0000563123d262fc in internal_error (file=0x563123e93fd8 "/home/smarchi/src/binutils-gdb/gdb/i387-tdep.c", line=1408, fmt=0x563123e94482 "invalid i387 regnum %d") at /home/smarchi/src/binutils-gdb/gdbsupport/errors.cc:55
#9 0x0000563123047d0d in i387_collect_xsave (regcache=0x5631269453f0, regnum=152, xsave=0x7ffd38402a20, gcore=0) at /home/smarchi/src/binutils-gdb/gdb/i387-tdep.c:1408
#10 0x0000563122c69e8a in amd64_collect_xsave (regcache=0x5631269453f0, regnum=152, xsave=0x7ffd38402a20, gcore=0) at /home/smarchi/src/binutils-gdb/gdb/amd64-tdep.c:3448
#11 0x0000563122c5e94c in amd64_linux_nat_target::store_registers (this=0x56312515fd10 <the_amd64_linux_nat_target>, regcache=0x5631269453f0, regnum=152) at /home/smarchi/src/binutils-gdb/gdb/amd64-linux-nat.c:335
#12 0x00005631234c8c80 in target_store_registers (regcache=0x5631269453f0, regno=152) at /home/smarchi/src/binutils-gdb/gdb/target.c:3485
#13 0x00005631232e8df7 in regcache::raw_write (this=0x5631269453f0, regnum=152, buf=0x56312759e468 "@\225\372\367\377\177") at /home/smarchi/src/binutils-gdb/gdb/regcache.c:765
#14 0x00005631232e8f0c in regcache::cooked_write (this=0x5631269453f0, regnum=152, buf=0x56312759e468 "@\225\372\367\377\177") at /home/smarchi/src/binutils-gdb/gdb/regcache.c:778
#15 0x00005631232e75ec in regcache::restore (this=0x5631269453f0, src=0x5631275eb130) at /home/smarchi/src/binutils-gdb/gdb/regcache.c:283
#16 0x0000563123083fc4 in infcall_suspend_state::restore (this=0x5631273ed930, gdbarch=0x56312718cf20, tp=0x5631270bca90, regcache=0x5631269453f0) at /home/smarchi/src/binutils-gdb/gdb/infrun.c:9103
#17 0x0000563123081eed in restore_infcall_suspend_state (inf_state=0x5631273ed930) at /home/smarchi/src/binutils-gdb/gdb/infrun.c:9151
The problem seems to be that amd64_linux_nat_target::store_registers
calls amd64_native_gregset_supplies_p to know whether gregset provides
fs_base. When !HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE,
amd64_native_gregset_supplies_p returns false. store_registers
therefore assumes that it must be an "xstate" register. This is of
course wrong, and that leads to the failed assertion when
i387_collect_xsave doesn't recognize the register.
amd64_linux_nat_target::store_registers could probably be fixed to
handle this case, but I don't think it's worth it, given that it would
only be to support very old kernels.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=df5d438e33d7fc914ba9b6e0d6b019a8966c5fcc
[2] https://sourceware.org/git/?p=glibc.git;a=commit;h=c9cf6ddeebb7bb
[3] https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/?id=88e4bc32686ebd0b1111a94f93eba2d334241f68
gdb/ChangeLog:
* configure.ac: Remove check for fs_base/gs_base in
user_regs_struct.
* configure: Re-generate.
* config.in: Re-generate.
* amd64-nat.c (amd64_native_gregset_reg_offset): Adjust.
* amd64-linux-nat.c (amd64_linux_nat_target::fetch_registers,
amd64_linux_nat_target::store_registers, ps_get_thread_area, ): Adjust.
gdbserver/ChangeLog:
* configure.ac: Remove check for fs_base/gs_base in
user_regs_struct.
* configure: Re-generate.
* config.in: Re-generate.
* linux-x86-low.cc (x86_64_regmap, x86_fill_gregset,
x86_store_gregset): Adjust.
|
|
If the search area is bigger than SEARCH_CHUNK_SIZE (16000), then you get
an error in gdbserver:
gdb: (gdb) find /w 0x3c43f0,+20000,0x04030201
gdb: Pattern not found.
gdbserver: Unable to access 3997 bytes of target memory at 0x3c8273, halting search.
The return value of any additional gdb_read_memory calls were compared with the
wrong value, this fixes it.
gdbserver/ChangeLog:
2020-04-22 Hannes Domani <ssbssa@yahoo.de>
* server.cc (handle_search_memory_1): Fix gdb_read_memory return value
comparison.
|
|
Simon pointed out that the windows-nat sharing series broke the Cygwin
build. This patch fixes the problem, by moving the Cygwin-specific
code to a new handler function. This approach is taken because this
code calls find_pc_partial_function, which isn't available in
gdbserver.
gdb/ChangeLog
2020-04-16 Tom Tromey <tromey@adacore.com>
* windows-nat.c (windows_nat::handle_access_violation): New
function.
* nat/windows-nat.h (handle_access_violation): Declare.
* nat/windows-nat.c (handle_exception): Move Cygwin code to
windows-nat.c. Call handle_access_violation.
gdbserver/ChangeLog
2020-04-16 Tom Tromey <tromey@adacore.com>
* win32-low.cc (windows_nat::handle_access_violation): New
function.
|
|
When compiling on Cygwin, we get:
CXX win32-low.o
/home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc: In function ‘int get_child_debug_event(DWORD*, target_waitstatus*)’:
/home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc:1459:17: error: format ‘%x’ expects argument of type ‘unsigned int’, but argument 2 has type ‘long int’ [-Werror=format=]
1459 | OUTMSG2 (("get_windows_debug_event - "
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
1460 | "unexpected stop in 0x%x (expecting 0x%x)\n",
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1461 | ptid.lwp (), desired_stop_thread_id));
| ~~~~~~~~~~~
| |
| long int
/home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc:52:11: note: in definition of macro ‘OUTMSG2’
52 | printf X; \
| ^
/home/smarchi/src/binutils-gdb/gdbserver/win32-low.cc:1460:26: note: format string is defined here
1460 | "unexpected stop in 0x%x (expecting 0x%x)\n",
| ~^
| |
| unsigned int
| %lx
`ptid.lwp ()` is a `long` value, so it indeed needs the `l` size modifier.
gdbserver/ChangeLog:
* win32-low.cc (get_child_debug_event): Fix format string warning.
|
|
gdb_fildes_t and pfildes are no longer used, so remove them.
gdbserver/ChangeLog
2020-04-13 Tom Tromey <tom@tromey.com>
* server.h (gdb_fildes_t): Remove typedef.
* remote-utils.c (remote_desc, list_desc): Now int.
(INVALID_DESCRIPTOR): Remove.
(gdb_connected, remote_close)
(check_remote_input_interrupt_request): Update.
* utils.h (pfildes): Don't declare.
* utils.c (pfildes): Remove.
|
|
This changes gdbserver to use the gdbserver event loop, removing the
ancient fork.
gdbserver/ChangeLog
2020-04-13 Tom Tromey <tom@tromey.com>
* server.h (handle_serial_event, handle_target_event): Update.
* server.c: Don't call initialize_event_loop.
(keep_processing_events): New global.
(handle_serial_event): Return void. Set keep_processing_events.
(handle_target_event): Return void.
(start_event_loop): Move from event-loop.c. Rewrite.
* remote-utils.c (handle_accept_event): Return void.
(reset_readchar): Use delete_timer.
(process_remaining): Return void.
(reschedule): Use create_timer.
* event-loop.h: Remove.
* event-loop.cc: Remove.
* Makefile.in (OBS): Use gdbsupport/event-loop.o, not event-loop.o.
|
|
event-loop.c requires the client to provide some functions. This
patch implements these functions for gdbserver.
gdbserver/ChangeLog
2020-04-13 Tom Tromey <tom@tromey.com>
* server.c (invoke_async_signal_handlers)
(check_async_event_handlers, flush_streams, gdb_select): New
functions.
|
|
gdb_select.h and the event loop require some configure checks, so this
moves the needed checks to common.m4 and updates the configure
scripts.
gdb/ChangeLog
2020-04-13 Tom Tromey <tom@tromey.com>
* configure: Rebuild.
* configure.ac: Remove checks that are now in GDB_AC_COMMON.
gdbserver/ChangeLog
2020-04-13 Tom Tromey <tom@tromey.com>
* configure: Rebuild.
* config.in: Rebuild.
gdbsupport/ChangeLog
2020-04-13 Tom Tromey <tom@tromey.com>
* config.in, configure: Rebuild.
* common.m4 (GDB_AC_COMMON): Check for poll.h, sys/poll.h,
sys/select.h, and poll.
|
|
This changes gdbserver to also handle pending stops, the same way that
gdb does. This is PR gdb/22992.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
PR gdb/22992
* win32-low.c (child_continue): Call matching_pending_stop.
(get_child_debug_event): Call fetch_pending_stop. Push pending
stop when needed.
|
|
This changes the Windows gdbserver port to implement the
stopped_by_sw_breakpoint target method. This is needed to support
pending stops.
This is a separate patch now, because Pedro suggested splitting it out
for simpler bisecting, in the case that it introduces a bug.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.h (win32_process_target::stopped_by_sw_breakpoint)
(win32_process_target::supports_stopped_by_sw_breakpoint):
Declare.
* win32-low.c (win32_supports_z_point_type): Always handle
Z_PACKET_SW_BP.
(win32_insert_point): Call insert_memory_breakpoint when needed.
(win32_remove_point): Call remove_memory_breakpoint when needed.
(win32_process_target::stopped_by_sw_breakpoint)
(win32_process_target::supports_stopped_by_sw_breakpoint): New
methods.
(win32_target_ops): Update.
(maybe_adjust_pc): New function.
(win32_wait): Call maybe_adjust_pc.
|
|
This adds a decr_pc_after_break member to win32_target_ops and updates
the two Windows targets to set it.
Note that I can't test the win32-arm-low.c change.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.h (struct win32_target_ops) <decr_pc_after_break>: New
field.
* win32-i386-low.c (the_low_target): Update.
* win32-arm-low.c (the_low_target): Update.
|
|
This changes win32-low.c to implement the read_pc and write_pc
methods. A subsequent patch will need these.
Note that I have no way to test, or even compile, the win32-arm-low.c
change.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.h (win32_process_target::read_pc)
(win32_process_target::write_pc): Declare.
* win32-low.c (win32_process_target::read_pc)
(win32_process_target::write_pc): New methods.
* win32-i386-low.c (i386_win32_get_pc, i386_win32_set_pc): New
functions.
(the_low_target): Update.
* win32-arm-low.c (arm_win32_get_pc, arm_win32_set_pc): New
functions.
(the_low_target): Update.
|
|
This moves the wait_for_debug_event helper function to
nat/windows-nat.c, and changes gdbserver to use it.
wait_for_debug_event is a wrapper for WaitForDebugEvent that also sets
last_wait_event when appropriate. This is needed to properly handle
queued stops.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (wait_for_debug_event): Move to
nat/windows-nat.c.
* nat/windows-nat.h (wait_for_debug_event): Declare.
* nat/windows-nat.c (wait_for_debug_event): Move from
windows-nat.c. No longer static.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (win32_kill, get_child_debug_event): Use
wait_for_debug_event.
|
|
This adds a couple of functions to nat/windows-nat.c and changes gdb
and gdbserver to use them. One function checks the list of pending
stops for a match (not yet used by gdbserver, but will be in a
subsequent patch); and the other is a wrapper for ContinueDebugEvent
that always uses the last "real" stop event.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (windows_continue): Use matching_pending_stop and
continue_last_debug_event.
* nat/windows-nat.h (matching_pending_stop)
(continue_last_debug_event): Declare.
* nat/windows-nat.c (DEBUG_EVENTS): New define.
(matching_pending_stop, continue_last_debug_event): New
functions.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (child_continue): Call continue_last_debug_event.
|
|
Both gdb and gdbserver have a "handle_exception" function, the bulk of
which is shared between the two implementations. This patch arranges
for the entire thing to be moved into nat/windows-nat.c, with the
differences handled by callbacks. This patch introduces one more
callback to make this possible.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (MS_VC_EXCEPTION): Move to nat/windows-nat.c.
(handle_exception_result): Move to nat/windows-nat.h.
(DEBUG_EXCEPTION_SIMPLE): Remove.
(windows_nat::handle_ms_vc_exception): New function.
(handle_exception): Move to nat/windows-nat.c.
(get_windows_debug_event): Update.
(STATUS_WX86_BREAKPOINT, STATUS_WX86_SINGLE_STEP): Move to
nat/windows-nat.c.
* nat/windows-nat.h (handle_ms_vc_exception): Declare.
(handle_exception_result): Move from windows-nat.c.
(handle_exception): Declare.
* nat/windows-nat.c (MS_VC_EXCEPTION, handle_exception)
(STATUS_WX86_SINGLE_STEP, STATUS_WX86_BREAKPOINT): Move from
windows-nat.c.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (handle_exception): Remove.
(windows_nat::handle_ms_vc_exception): New function.
(get_child_debug_event): Add "continue_status" parameter.
Update.
(win32_wait): Update.
|
|
This changes nat/windows-nat.h to declare handle_load_dll and
handle_unload_dll. The embedding application is required to implement
these -- while the actual code was difficult to share due to some
other differences between the two programs, sharing the declaration
lets a subsequent patch share more code that uses these as callbacks.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (windows_nat::handle_load_dll)
(windows_nat::handle_unload_dll): Rename. No longer static.
* nat/windows-nat.h (handle_load_dll, handle_unload_dll):
Declare.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (windows_nat::handle_load_dll): Rename from
handle_load_dll. No longer static.
(windows_nat::handle_unload_dll): Rename from handle_unload_dll.
No longer static.
|
|
This changes gdbserver's implementation of handle_output_debug_string
to have the same calling convention as that of gdb. This allows for
sharing some more code in a subsequent patch.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (windows_nat::handle_output_debug_string):
Rename. No longer static.
* nat/windows-nat.h (handle_output_debug_string): Declare.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (handle_output_debug_string): Add parameter. Change
return type.
(win32_kill, get_child_debug_event): Update.
|
|
This moves some Windows-related globals into nat/windows-nat.c,
sharing them between gdb and gdbserver.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (current_process_handle, current_process_id)
(main_thread_id, last_sig, current_event, last_wait_event)
(current_windows_thread, desired_stop_thread_id, pending_stops)
(struct pending_stop, siginfo_er): Move to nat/windows-nat.c.
(display_selectors, fake_create_process)
(get_windows_debug_event): Update.
* nat/windows-nat.h (current_process_handle, current_process_id)
(main_thread_id, last_sig, current_event, last_wait_event)
(current_windows_thread, desired_stop_thread_id, pending_stops)
(struct pending_stop, siginfo_er): Move from windows-nat.c.
* nat/windows-nat.c (current_process_handle, current_process_id)
(main_thread_id, last_sig, current_event, last_wait_event)
(current_windows_thread, desired_stop_thread_id, pending_stops)
(siginfo_er): New globals. Move from windows-nat.c.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (current_process_handle, current_process_id)
(main_thread_id, last_sig, current_event, siginfo_er): Move to
nat/windows-nat.c.
|
|
This moves get_image_name to nat/windows-nat.c so that it can be
shared between gdb and gdbserver.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (get_image_name): Move to nat/windows-nat.c.
(handle_load_dll): Update.
* nat/windows-nat.c (get_image_name): Move from windows-nat.c.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (get_image_name): Remove.
(handle_load_dll): Update.
|
|
This changes gdb and gdbserver to use the same calling convention for
the "thread_rec" helper function. Fully merging these is difficult
due to differences in how threads are managed by the enclosing
applications; but sharing a declaration makes it possible for future
shared code to call this method.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (enum thread_disposition_type): Move to
nat/windows-nat.h.
(windows_nat::thread_rec): Rename from thread_rec. No longer
static.
(windows_add_thread, windows_nat_target::fetch_registers)
(windows_nat_target::store_registers, handle_exception)
(windows_nat_target::resume, get_windows_debug_event)
(windows_nat_target::get_tib_address)
(windows_nat_target::thread_name)
(windows_nat_target::thread_alive): Update.
* nat/windows-nat.h (enum thread_disposition_type): Move from
windows-nat.c.
(thread_rec): Declare.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (windows_nat::thread_rec): Rename from thread_rec.
No longer static. Change parameters.
(child_add_thread, child_fetch_inferior_registers)
(child_store_inferior_registers, win32_resume)
(win32_get_tib_address): Update.
|
|
This wraps the shared windows-nat code in a windows_nat namespace.
This helps avoid name clashes.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c: Add "using namespace".
* nat/windows-nat.h: Wrap contents in windows_nat namespace.
* nat/windows-nat.c: Wrap contents in windows_nat namespace.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.h (struct win32_target_ops): Use qualified names where
needed.
* win32-i386-low.c: Add "using namespace".
* win32-low.c: Add "using namespace".
* win32-arm-low.c: Add "using namespace".
|
|
Add a destructor to windows_thread_info that calls CloseHandle.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* nat/windows-nat.h (struct windows_thread_info): Declare
destructor.
* nat/windows-nat.c (~windows_thread_info): New.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (delete_thread_info): Don't call CloseHandle.
|
|
This adds "suspend" and "resume" methods to windows_thread_info, and
changes gdb and gdbserver to share this code.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (thread_rec): Use windows_thread_info::suspend.
(windows_continue): Use windows_continue::resume.
* nat/windows-nat.h (struct windows_thread_info) <suspend,
resume>: Declare new methods.
* nat/windows-nat.c: New file.
* configure.nat (NATDEPFILES): Add nat/windows-nat.o when needed.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (win32_require_context, suspend_one_thread): Use
windows_thread_info::suspend.
(continue_one_thread): Use windows_thread_info::resume.
* configure.srv (srv_tgtobj): Add windows-nat.o when needed.
|
|
This changes a couple of fields of windows_thread_info to have type
"bool". It also updates the comment of another field, to clarify the
possible values it can hold.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (thread_rec)
(windows_nat_target::fetch_registers): Update.
* nat/windows-nat.h (struct windows_thread_info) <suspended>:
Update comment.
<debug_registers_changed, reload_context>: Now bool.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-i386-low.c (update_debug_registers)
(i386_prepare_to_resume, i386_thread_added): Update.
|
|
This adds a constructor, destructor, and member initializers to
windows_thread_info, and changes gdb and gdbserver to use new and
delete.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (windows_add_thread): Use new.
(windows_init_thread_list, windows_delete_thread): Use delete.
(get_windows_debug_event): Update.
* nat/windows-nat.h (struct windows_thread_info): Add constructor,
destructor, and initializers.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.c (child_add_thread): Use new.
(delete_thread_info): Use delete.
|
|
This introduces a new file, nat/windows-nat.h, which holds the
definition of windows_thread_info. This is now shared between gdb and
gdbserver.
Note that the two implementations different slightly. gdb had a
couple of fields ("name" and "reload_context") that gdbserver did not;
while gdbserver had one field ("base_context") that gdb did not, plus
better comments. The new file preserves all the fields, and the
comments.
gdb/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* windows-nat.c (struct windows_thread_info): Remove.
* nat/windows-nat.h: New file.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.h (struct windows_thread_info): Remove.
|
|
This renames win32_thread_info to windows_thread_info in gdbserver.
This renaming helps make it possible to share some code between gdb
and gdbserver.
gdbserver/ChangeLog
2020-04-08 Tom Tromey <tromey@adacore.com>
* win32-low.h (struct windows_thread_info): Rename from
win32_thread_info. Remove typedef.
(struct win32_target_ops, win32_require_context): Update.
* win32-low.c (win32_get_thread_context)
(win32_set_thread_context, win32_prepare_to_resume)
(win32_require_context, thread_rec, child_add_thread)
(delete_thread_info, continue_one_thread)
(child_fetch_inferior_registers, child_store_inferior_registers)
(win32_resume, suspend_one_thread, win32_get_tib_address):
Update.
* win32-i386-low.c (update_debug_registers)
(win32_get_current_dr, i386_get_thread_context)
(i386_prepare_to_resume, i386_thread_added, i386_single_step)
(i386_fetch_inferior_register, i386_store_inferior_register):
Update.
* win32-arm-low.c (arm_get_thread_context)
(arm_fetch_inferior_register, arm_store_inferior_register):
Update.
|
|
All the linux target ops have been moved into linux_process_target
as methods. The 'linux_target_ops' struct and its instantiations
are now obsolete. Delete them.
gdbserver/ChangeLog:
2020-04-02 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
* linux-low.h (struct linux_target_ops): Remove.
(the_low_target): Remove.
* linux-x86-low.cc (the_low_target): Remove.
* linux-aarch64-low.cc (the_low_target): Ditto.
* linux-arm-low.cc (the_low_target): Ditto.
* linux-bfin-low.cc (the_low_target): Ditto.
* linux-cris-low.cc (the_low_target): Ditto.
* linux-crisv32-low.cc (the_low_target): Ditto.
* linux-ia64-low.cc (the_low_target): Ditto.
* linux-m32r-low.cc (the_low_target): Ditto.
* linux-m68k-low.cc (the_low_target): Ditto.
* linux-mips-low.cc (the_low_target): Ditto.
* linux-nios2-low.cc (the_low_target): Ditto.
* linux-ppc-low.cc (the_low_target): Ditto.
* linux-riscv-low.cc (the_low_target): Ditto.
* linux-s390-low.cc (the_low_target): Ditto.
* linux-sh-low.cc (the_low_target): Ditto.
* linux-sparc-low.cc (the_low_target): Ditto.
* linux-tic6x-low.cc (the_low_target): Ditto.
* linux-tile-low.cc (the_low_target): Ditto.
* linux-xtensa-low.cc (the_low_target): Ditto.
|
|
gdbserver/ChangeLog:
2020-04-02 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
Remove the 'get_ipa_tdesc_idx' linux target op and let a concrete
linux target define the op by overriding the declaration in
process_stratum_target.
* linux-low.h (struct linux_target_ops): Remove the op.
(class linux_process_target) <get_ipa_tdesc_idx>: Remove.
* linux-low.cc (linux_process_target::get_ipa_tdesc_idx): Remove.
* linux-x86-low.cc (class x86_target) <get_ipa_tdesc_idx>: Declare.
(x86_get_ipa_tdesc_idx): Turn into...
(x86_target::get_ipa_tdesc_idx): ...this.
(the_low_target): Remove the op field.
* linux-ppc-low.cc (class ppc_target) <get_ipa_tdesc_idx>: Declare.
(ppc_get_ipa_tdesc_idx): Turn into...
(ppc_target::get_ipa_tdesc_idx): ...this.
(the_low_target): Remove the op field.
* linux-s390-low.cc (class s390_target) <get_ipa_tdesc_idx>: Declare.
(s390_get_ipa_tdesc_idx): Turn into...
(s390_target::get_ipa_tdesc_idx): ...this.
(the_low_target): Remove the op field.
|
|
gdbserver/ChangeLog:
2020-04-02 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
Turn the 'get_syscall_trapinfo' linux target op into a method
of process_stratum_target.
* linux-low.h (struct linux_target_ops): Remove the op.
(class linux_process_target) <get_syscall_trapinfo>
<gdb_catch_this_syscall>
<low_supports_catch_syscall>
<low_get_syscall_trapinfo>: Declare.
* linux-low.cc (get_syscall_trapinfo): Turn into...
(linux_process_target::get_syscall_trapinfo): ...this.
(linux_process_target::low_get_syscall_trapinfo): Define.
(gdb_catch_this_syscall_p): Turn into...
(linux_process_target::gdb_catch_this_syscall): ...this.
(linux_process_target::low_supports_catch_syscall): Define.
Update the callers below.
(linux_process_target::wait_1)
(linux_process_target::supports_catch_syscall)
* linux-x86-low.cc (class x86_target) <low_supports_catch_syscall>
<low_get_syscall_trapinfo>: Declare.
(x86_target::low_supports_catch_syscall): Define.
(x86_get_syscall_trapinfo): Turn into...
(x86_target::low_get_syscall_trapinfo): ...this.
(the_low_target): Remove the op field.
* linux-aarch64-low.cc (class aarch64_target)
<low_supports_catch_syscall>
<low_get_syscall_trapinfo>: Declare.
(aarch64_target::low_supports_catch_syscall): Define.
(aarch64_get_syscall_trapinfo): Turn into...
(aarch64_target::low_get_syscall_trapinfo): ...this.
(the_low_target): Remove the op field.
* linux-arm-low.cc (class arm_target) <low_supports_catch_syscall>
<low_get_syscall_trapinfo>: Declare.
(arm_target::low_supports_catch_syscall): Define.
(arm_get_syscall_trapinfo): Turn into...
(arm_target::low_get_syscall_trapinfo): ...this.
(the_low_target): Remove the op field.
* linux-ppc-low.cc (the_low_target): Remove the op field.
* linux-s390-low.cc (the_low_target): Remove the op field.
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