This patch fixes the routines to collect and supply ptrace registers on ppc64le
gdbserver. Originally written for big endian arch, they were causing several
issues on little endian. With this fix, the number of unexpected failures in
the testsuite dropped from 263 to 72 on ppc64le.
gdb/gdbserver/ChangeLog
* linux-ppc-low.c (ppc_collect_ptrace_register): Adjust routine to take
endianness into account.
(ppc_supply_ptrace_register): Likewise.
PTRACE_PEEKUSER can return -1, which is usually used to determine whether
a system call has reported an error, so errno must be used alone to
determine whether an error occurred. However errno isn't modified by a
successful system call so it must be reset to a known value (0) before the
syscall call.
Add the missing errno reset when reading the DSP_CONTROL register in the
native MIPS Linux backend and the MIPS gdbserver backend.
gdb/:
* mips-linux-nat.c (mips_linux_read_description): Reset errno to 0
prior to reading DSP_CONTROL with PTRACE_PEEKUSER ptrace call.
gdb/gdbserver/:
* linux-mips-low.c (mips_read_description): Reset errno to 0 prior
to reading DSP_CONTROL with PTRACE_PEEKUSER ptrace call.
The loop macro ALL_DEBUG_REGISTERS does not iterate over the status or
control registers, so its name is misleading. This commit renames it
as ALL_DEBUG_ADDRESS_REGISTERS and updates all uses. This commit also
updates its loop conditions to an equivalent but better form, and
makes two functions use it that had previously hardwired the loop.
A comment on a related field in the x86_debug_reg_state structure is
also updated to reflect that the field refers specifically to address
registers only.
gdb/ChangeLog:
* nat/x86-dregs.h (ALL_DEBUG_REGISTERS): Renamed as...
(ALL_DEBUG_ADDRESS_REGISTERS): New macro. All uses updated.
Loop conditions changed to equivalent form.
(struct x86_debug_reg_state): Updated dr_ref_count comment.
* x86-linux-nat.c (x86_linux_prepare_to_resume): Use
ALL_DEBUG_ADDRESS_REGISTERS.
gdb/gdbserver/ChangeLog:
* linux-x86-low.c (x86_linux_prepare_to_resume): Use
ALL_DEBUG_ADDRESS_REGISTERS.
This commit renames nine files that contain code used by both 32- and
64-bit Intel ports such that their names are prefixed with "x86"
rather than "i386". All types, functions and variables within these
files are likewise renamed such that their names are prefixed with
"x86" rather than "i386". This makes GDB follow the convention used
by gdbserver such that 32-bit Intel code lives in files called
"i386-*", 64-bit Intel code lives in files called "amd64-*", and code
for both 32- and 64-bit Intel lives in files called "x86-*".
This commit only renames OS-independent files. The Linux ports of
both GDB and gdbserver now follow the i386/amd64/x86 convention fully.
Some ports still use the old convention where "i386" in file/function/
type/variable names can mean "32-bit only" or "32- and 64-bit" but I
don't want to touch ports I can't fully test except where absolutely
necessary.
gdb/ChangeLog:
* i386-nat.h: Renamed as...
* x86-nat.h: New file. All type, function and variable name
prefixes changed from "i386_" to "x86_". All references updated.
* i386-nat.c: Renamed as...
* x86-nat.c: New file. All type, function and variable name
prefixes changed from "i386_" to "x86_". All references updated.
* common/i386-xstate.h: Renamed as...
* common/x86-xstate.h: New file. All type, function and variable
name prefixes changed from "i386_" to "x86_". All references
updated.
* nat/i386-cpuid.h: Renamed as...
* nat/x86-cpuid.h: New file. All type, function and variable name
prefixes changed from "i386_" to "x86_". All references updated.
* nat/i386-gcc-cpuid.h: Renamed as...
* nat/x86-gcc-cpuid.h: New file. All type, function and variable
name prefixes changed from "i386_" to "x86_". All references
updated.
* nat/i386-dregs.h: Renamed as...
* nat/x86-dregs.h: New file. All type, function and variable name
prefixes changed from "i386_" to "x86_". All references updated.
* nat/i386-dregs.c: Renamed as...
* nat/x86-dregs.c: New file. All type, function and variable name
prefixes changed from "i386_" to "x86_". All references updated.
gdb/gdbserver/ChangeLog:
* i386-low.h: Renamed as...
* x86-low.h: New file. All type, function and variable name
prefixes changed from "i386_" to "x86_". All references updated.
* i386-low.c: Renamed as...
* x86-low.c: New file. All type, function and variable name
prefixes changed from "i386_" to "x86_". All references updated.
This commit replaces two uses of xcalloc (1, ...) with XCNEW.
gdb/gdbserver/ChangeLog:
* linux-x86-low.c (x86_linux_new_process): Use XCNEW.
(x86_linux_new_thread): Likewise.
This commit replaces the hacky "exception" system in gdbserver with
the exceptions and cleanups subsystem from GDB.
Only the catch/cleanup code in what was "main" has been updated to
use the new system. Other parts of gdbserver can now be converted
to use TRY_CATCH and cleanups on an as-needed basis.
A side-effect of this commit is that some error messages will change
slightly, and in cases with multiple errors the error messages will
be printed in a different order.
gdb/gdbserver/ChangeLog:
* server.h (setjmp.h): Do not include.
(toplevel): Do not declare.
(common-exceptions.h): Include.
(cleanups.h): Likewise.
* server.c (toplevel): Do not define.
(exit_code): New static global.
(detach_or_kill_for_exit_cleanup): New function.
(main): New function. Original main renamed to...
(captured_main): New function.
* utils.c (verror) [!IN_PROCESS_AGENT]: Use throw_verror.
This commit creates a new file, common/gdb_setjmp.h, to hold some
portability macros for setjmp/longjmp et al. that are used by the
exceptions subsystem and by the demangler crash catcher.
gdb/ChangeLog:
* common/gdb_setjmp.h: New file.
* Makefile.in (HFILES_NO_SRCDIR): Add common/gdb_setjmp.h.
* configure.ac: Move sigsetjmp check...
* common/common.m4: ...here.
* configure: Regenerate.
* cp-support.c (SIGJMP_BUF): Delete.
(SIGSETJMP): Likewise.
(SIGLONGJMP): Likewise.
* exceptions.h (gdb_setjmp.h): Include.
(setjmp.h): Do not include.
(EXCEPTIONS_SIGJMP_BUF): Delete.
(EXCEPTIONS_SIGSETJMP): Likewise.
(EXCEPTIONS_SIGLONGJMP): Likewise.
Replace all uses of EXCEPTIONS_SIG* macros with SIG* macros
from gdb_setjmp.h.
* exceptions.c: Likewise.
gdb/gdbserver/ChangeLog:
* config.in: Regenerate.
* configure: Likewise.
This commit moves cleanups.[ch] into gdb/common/. The only change to
the content of the files is that cleanups.c's include list was altered
to match its new location.
gdb/ChangeLog:
* cleanups.h: Moved to...
* common/cleanups.h: New file.
* cleanups.c: Moved to...
* common/cleanups.c: New file. Include common-defs.h and
cleanups.h. Do not include defs.h.
* Makefile.in (SFILES): Replace cleanups.c with common/cleanups.c.
(HFILES_NO_SRCDIR): Replace cleanups.h with common/cleanups.h.
(cleanups.o): New rule.
gdb/gdbserver/ChangeLog:
* Makefile.in (SFILES): Add common/cleanups.c.
(OBS): cleanups.o.
(cleanups.o): New rule.
This commit removes the now-unused fatal function and prototype.
gdb/gdbserver/ChangeLog:
* utils.h (fatal): Remove declaration.
* utils.c (fatal): Remove function.
This commit converts four calls to fatal into calls to
perror_with_name. perror_with_name calls error, which
in IPA terminates with exit (1) rather than longjmp, so
there is no functional change here.
gdb/gdbserver/ChangeLog:
* tracepoint.c (gdb_agent_init): Replace fatal with
perror_with_name.
(initialize_tracepoint): Likewise.
This commit converts a call to fatal in remote_prepare with a call to
error. remote_prepare is called precisely once, from main, at a point
where jumping to toplevel will call exit (1), so error and fatal are
functionally equivalent at this point. Note that remote_prepare calls
perror_with_name (which calls error) so callers of remote_prepare must
already handle the fact that it may exit via longjmp.
gdb/gdbserver/ChangeLog:
* remote-utils.c (remote_prepare): Replace fatal with error.
This commit downgrades a fatal error to a warning in linux_async.
linux_async is called from two different places in gdbserver:
Via target_async from handle_accept_event. The argument
is always zero, so the warning will never be printed here.
Via start_non_stop from handle_general_set. This prints
its own error message to stderr on failure, which will
be preceded by the warning if it is emitted.
gdb/gdbserver/ChangeLog:
* linux-low.c (linux_async): Replace fatal with warning.
Tidy up and return.
(linux_start_non_stop): Return -1 if linux_async failed.
This commit converts if..fatal checks in both i386_dr_low_set_addr
implementations to gdb_asserts. It's not obvious from the context,
but the conditional in both cases is changed to match the equivalent
conditional in the i386_dr_low_get_addr implementations. Nothing
fundamental has changed because DR_FIRSTADDR is zero. This commit
also removes a vague comment in Linux i386_dr_low_get_addr. I could
have reworded the comment (and replicated it three times for the other
identical assertions) but I think the existence of specific functions
for the status and control registers makes it fairly obvious what is
going on.
gdb/gdbserver/ChangeLog:
* linux-x86-low.c (i386_dr_low_set_addr): Replace check with
gdb_assert.
(i386_dr_low_get_addr): Remove vague comment.
* win32-i386-low.c (i386_dr_low_set_addr): Replace check with
gdb_assert.
This introduces common-debug.h. This holds the functions debug_printf
and debug_vprintf, two functions that the common code can use to print
debugging messages. Clients of the common code are expected to
implement debug_vprintf; a debug_vprintf function is written from
scratch for GDB, and gdbserver's existing debug_printf is repurposed
as debug_vprintf.
common/agent.c is changed to use debug_vprintf rather than
defining the macro DEBUG_AGENT depending on GDBSERVER.
nat/i386-dregs.c is changed to use the externally-implemented
debug_printf, rather than defining it itself.
gdb/ChangeLog:
* common/common-debug.h: New file.
* common/common-debug.c: Likewise.
* debug.c: Likewise.
* Makefile.in (SFILES): Add common/common-debug.c.
(HFILES_NO_SRCDIR): Add common/common-debug.h.
(COMMON_OBS): Add common-debug.o and debug.o.
(common-debug.o): New rule.
* common/common-defs.h: Include common-debug.h.
* common/agent.c (debug_agent_printf): New function.
(DEBUG_AGENT): Redefine.
* nat/i386-dregs.c (debug_printf): Undefine.
gdb/gdbserver/ChangeLog:
* Makefile.in (SFILES): Add common/common-debug.c.
(OBS): Add common-debug.o.
(common-debug.o): New rule.
* debug.h (debug_printf): Don't declare.
* debug.c (debug_printf): Renamed and rewritten as...
(debug_vprintf): New function.
This commit moves the inclusion of print-utils.h to common-defs.h
and removes all other inclusions.
gdb/ChangeLog:
* common/common-defs.h: Include print-utils.h.
* utils.h: Do not include print-utils.h.
gdb/gdbserver/ChangeLog:
* utils.h: Do not include print-utils.h.
This introduces common-types.h. This file defines various standard
types used by gdb and gdbserver.
Currently these types are conditionally defined based on GDBSERVER.
The long term goal is to remove all such tests; however, this is
difficult as currently gdb uses definitions from BFD. In the meantime
this is still a step in the right direction.
gdb/ChangeLog:
* common/common-types.h: New file.
* Makefile.in (HFILES_NO_SRCDIR): Add common/common-types.h.
* common/common-defs.h: Include common-types.h.
* defs.h (gdb_byte, CORE_ADDR, CORE_ADDR_MAX, LONGEST)
(ULONGEST): Remove.
gdb/gdbserver/ChangeLog:
* server.h: Add static assertion.
(gdb_byte, CORE_ADDR, LONGEST, ULONGEST): Remove.
This introduces common/errors.h. This holds some error- and warning-
related declarations that can be used by the code in common, nat and
target. Some of the declared functions must be provided by the client
as documented by the header file comments.
gdb/ChangeLog:
* common/errors.h: New file.
* common/errors.c: Likewise.
* Makefile.in (SFILES): Add common/errors.c.
(HFILES_NO_SRCDIR): Add common/errors.h.
(COMMON_OBS): Add errors.o.
(errors.o): New rule.
* common/common-defs.h: Include errors.h.
* utils.h (perror_with_name, error, verror, warning, vwarning):
Don't declare.
* common/common-utils.h: (malloc_failure, internal_error):
Likewise.
gdb/gdbserver/ChangeLog:
* Makefile.in (SFILES): Add common/errors.c.
(OBS): Add errors.o.
(IPA_OBS): Add errors-ipa.o.
(errors.o): New rule.
(errors-ipa.o): Likewise.
* utils.h (perror_with_name, error, warning): Don't declare.
* utils.c (warning): Renamed and rewritten as...
(vwarning): New function.
(error): Renamed and rewritten as...
(verror): New function.
(internal_error): Renamed and rewritten as...
(internal_verror): New function.
This commit moves the inclusion of errno.h to common-defs.h and
removes all other inclusions. Note that prior to this commit
server.h included errno.h protected by "#ifdef HAVE_ERRNO_H".
This protection was added with the Windows CE port, which is
currently broken. Since no other platform needs this, I have
removed the protection and the configury to support it.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include errno.h.
* defs.h: Do not include errno.h.
* ada-typeprint.c: Likewise.
* c-typeprint.c: Likewise.
* core-regset.c: Likewise.
* corefile.c: Likewise.
* corelow.c: Likewise.
* event-loop.c: Likewise.
* f-typeprint.c: Likewise.
* gnu-nat.c: Likewise.
* go32-nat.c: Likewise.
* i386gnu-nat.c: Likewise.
* m2-typeprint.c: Likewise.
* nat/linux-btrace.c: Likewise.
* p-typeprint.c: Likewise.
* procfs.c: Likewise.
* remote-sim.c: Likewise.
* rs6000-nat.c: Likewise.
* target.c: Likewise.
* typeprint.c: Likewise.
* ui-file.c: Likewise.
* valops.c: Likewise.
* valprint.c: Likewise.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* configure.ac (AC_CHECK_HEADERS): Remove errno.h.
* configure: Regenerate.
* config.in: Likewise.
* server.h: Do not include errno.h.
* event-loop.c: Likewise.
* hostio-errno.c: Likewise.
* linux-low.c: Likewise.
* remote-utils.c: Likewise.
* spu-low.c: Likewise.
* utils.c: Likewise.
* gdbreplay.c: Unconditionally include errno.h.
This commit moves the inclusion of common-utils.h to common-defs.h and
removes all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include common-utils.h.
* defs.h: Do not include common-utils.h.
* common/gdb_assert.h: Likewise.
* darwin-nat.h: Likewise.
* nat/linux-btrace.c: Likewise.
* target/waitstatus.h: Likewise.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include common-utils.h.
This commit moves the inclusion of ptid.h to common-defs.h and removes
all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include ptid.h.
* defs.h: Do not include ptid.h.
* inferior.h: Likewise.
* infrun.h: Likewise.
* nat/linux-btrace.h: Likewise.
* nat/linux-osdata.h: Likewise.
* target/waitstatus.h: Likewise.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include ptid.h.
* notif.h: Likewise.
This commit moves the inclusion of gdb_locale.h to common-defs.h and
removes all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include gdb_locale.h.
* defs.h: Do not include gdb_locale.h.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include gdb_locale.h.
This commit moves the inclusion of gdb/signals.h to common-defs.h and
removes all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include gdb/signals.h.
* defs.h: Do not include gdb/signals.h.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include gdb/signals.h.
* win32-low.c: Likewise.
This commit moves the inclusion of pathmax.h to common-defs.h and
removes all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include pathmax.h.
* defs.h: Do not include pathmax.h.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include pathmax.h.
This commit moves the inclusion of libiberty.h to common-defs.h and
removes all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include libiberty.h.
* defs.h: Do not include libiberty.h.
* common/queue.h: Likewise.
* cp-name-parser.y: Likewise.
* mi/mi-cmd-catch.c: Likewise.
* python/python.c: Likewise.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include libiberty.h.
* linux-bfin-low.c: Likewise.
This commit moves the inclusion of ansidecl.h to common-defs.h and
removes all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include ansidecl.h.
* defs.h: Do not include ansidecl.h.
* common/buffer.h: Likewise.
* common/common-utils.h: Likewise.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include ansidecl.h.
This commit moves the inclusion of stdarg.h to common-defs.h and
removes all other inclusions.
gdb/
2014-08-07 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: Include stdarg.h.
* defs.h: Do not include stdarg.h.
* ada-lang.c: Likewise.
* common/common-utils.h: Likewise.
* guile/scm-string.c: Likewise.
* guile/scm-utils.c: Likewise.
* m32c-tdep.c: Likewise.
gdb/gdbserver/
2014-08-07 Gary Benson <gbenson@redhat.com>
* server.h: Do not include stdarg.h.
* nto-low.c: Likewise.
gdbserver's init_register_cache has some preprocessor conditionals
awkwardly nested around an if..else block. This commit moves the
conditionals inside the braces to make the code more readable.
gdb/gdbserver/
2014-08-06 Gary Benson <gbenson@redhat.com>
* regcache.c (init_register_cache): Move conditionals inside if.
This commit replaces a hardwired target-is-async check.
gdb/gdbserver/
2014-08-06 Gary Benson <gbenson@redhat.com>
* linux-low.c (linux_supports_non_stop): Use target_is_async_p.
This commit removes all inclusions of defs.h and server.h from header
files.
gdb/
2014-07-31 Gary Benson <gbenson@redhat.com>
* common/btrace-common.h: Do not include defs.h or server.h.
* nat/mips-linux-watch.h: Likewise.
* gdb-dlfcn.h: Do not include defs.h.
* tracefile.h: Likewise.
gdb/gdbserver/
2014-07-31 Gary Benson <gbenson@redhat.com>
* ax.h: Do not include server.h.
* gdbthread.h: Likewise.
* lynx-low.h: Likewise.
* notif.h: Likewise.
This commit creates a new header, common/common-defs.h, to hold
definitions common to all code under gdb/. Both gdb/defs.h and
gdb/gdbserver/server.h are modified to include common-defs.h as
their first non-comment line; all code under gdb/ includes either
defs.h or server.h as appropriate, so common-defs.h will be the
first actual code the compiler sees.
For this initial commit common-defs.h includes only the two
config.h files. Future commits will move more code currently
duplicated across defs.h and server.h such that shared code in
gdb/{common,target,nat} can be modified to include common-defs.h
rather than defs.h or server.h.
gdb/
2014-07-30 Gary Benson <gbenson@redhat.com>
* common/common-defs.h: New file.
* Makefile.in (HFILES_NO_SRCDIR): Add common/common-defs.h.
* defs.h: Include common-defs.h.
Do not include config.h or build-gnulib/config.h.
gdb/gdbserver/
2014-07-30 Gary Benson <gbenson@redhat.com>
* server.h: Include common-defs.h.
Do not include config.h or build-gnulib-gdbserver/config.h.
This commit makes all source files under gdb/ that include headers
from gdb/ include either defs.h or server.h before any other code.
This ensures that definitions and macros from the two config.h files
are always in place for our code. An exception has been made for
gdb/gdbserver/gdbreplay.c which seems to be a special case.
gdb/
2014-07-30 Gary Benson <gbenson@redhat.com>
* btrace.c: Include defs.h.
* common/ptid.c: Include defs.h or server.h as appropriate.
* nat/mips-linux-watch.c: Likewise.
gdb/gdbserver/
2014-07-30 Gary Benson <gbenson@redhat.com>
* hostio-errno.c: Move server.h to top of includes list.
* inferiors.c: Likewise.
* linux-x86-low.c: Likewise.
* notif.c: Include server.h.
gdbserver defines CORE_ADDR to be signed. This seems erroneous to
me; and furthermore likely to cause problems in common/, as it is
different from gdb's definition.
gdb/gdbserver/
2014-07-24 Tom Tromey <tromey@redhat.com>
Gary Benson <gbenson@redhat.com>
* server.h (CORE_ADDR): Now unsigned.
Since we use tkill everywhere, using kill to try to kill each lwp
individually looks suspiciously odd. We should really be using tgkill
everywhere, but at least while we don't get there this makes us
consistent.
gdb/gdbserver/
2014-07-16 Pedro Alves <palves@redhat.com>
* linux-low.c (linux_kill_one_lwp): Use kill_lwp, not kill.
gdb/
2014-07-16 Pedro Alves <palves@redhat.com>
* linux-nat.c (kill_callback): Use kill_lwp, not kill.
Although most compilers follow right-to-left evaluation order, the
order of evaluation of a function call's arguments is really
unspecified. target_pid_to_str or ptid_of may well clobber errno when
we get to evaluate the third argument to debug_printf.
gdb/gdbserver/
2014-07-15 Pedro Alves <palves@redhat.com>
* linux-low.c (linux_kill_one_lwp): Save errno and work with saved
copy.
Here's an example, with the new test:
gdbserver :9999 gdb.threads/kill
gdb gdb.threads/kill
(gdb) b 52
Breakpoint 1 at 0x4007f4: file kill.c, line 52.
Continuing.
Breakpoint 1, main () at kill.c:52
52 return 0; /* set break here */
(gdb) k
Kill the program being debugged? (y or n) y
gdbserver :9999 gdb.threads/kill
Process gdb.base/watch_thread_num created; pid = 9719
Listening on port 1234
Remote debugging from host 127.0.0.1
Killing all inferiors
Segmentation fault (core dumped)
Backtrace:
(gdb) bt
#0 0x00000000004068a0 in find_inferior (list=0x66b060 <all_threads>, func=0x427637 <kill_one_lwp_callback>, arg=0x7fffffffd3fc) at src/gdb/gdbserver/inferiors.c:199
#1 0x00000000004277b6 in linux_kill (pid=15708) at src/gdb/gdbserver/linux-low.c:966
#2 0x000000000041354d in kill_inferior (pid=15708) at src/gdb/gdbserver/target.c:163
#3 0x00000000004107e9 in kill_inferior_callback (entry=0x6704f0) at src/gdb/gdbserver/server.c:2934
#4 0x0000000000406522 in for_each_inferior (list=0x66b050 <all_processes>, action=0x4107a6 <kill_inferior_callback>) at src/gdb/gdbserver/inferiors.c:57
#5 0x0000000000412377 in process_serial_event () at src/gdb/gdbserver/server.c:3767
#6 0x000000000041267c in handle_serial_event (err=0, client_data=0x0) at src/gdb/gdbserver/server.c:3880
#7 0x00000000004189ff in handle_file_event (event_file_desc=4) at src/gdb/gdbserver/event-loop.c:434
#8 0x00000000004181c6 in process_event () at src/gdb/gdbserver/event-loop.c:189
#9 0x0000000000418f45 in start_event_loop () at src/gdb/gdbserver/event-loop.c:552
#10 0x0000000000411272 in main (argc=3, argv=0x7fffffffd8d8) at src/gdb/gdbserver/server.c:3283
The problem is that linux_wait_for_event deletes lwps that have exited
(even those not passed in as lwps of interest), while the lwp/thread
list is being walked on with find_inferior. find_inferior can handle
the current iterated inferior being deleted, but not others.
When killing lwps, we don't really care about any of the pending
status handling of linux_wait_for_event. We can just waitpid the lwps
directly, which is also what GDB does (see
linux-nat.c:kill_wait_callback). This way the lwps are not deleted
while we're walking the list. They'll be deleted by linux_mourn
afterwards.
This crash triggers several times when running the testsuite against
GDBserver with the native-gdbserver board (target remote), but as GDB
can't distinguish between GDBserver crashing and "kill" being
sucessful, as in both cases the connection is closed (the 'k' packet
doesn't require a reply), and the inferior is gone, that results in no
FAIL.
The patch adds a generic test that catches the issue with
extended-remote mode (and works fine with native testing too). Here's
how it fails with the native-extended-gdbserver board without the fix:
(gdb) info threads
Id Target Id Frame
6 Thread 15367.15374 0x000000373bcbc98d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
5 Thread 15367.15373 0x000000373bcbc98d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
4 Thread 15367.15372 0x000000373bcbc98d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
3 Thread 15367.15371 0x000000373bcbc98d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
2 Thread 15367.15370 0x000000373bcbc98d in nanosleep () at ../sysdeps/unix/syscall-template.S:81
* 1 Thread 15367.15367 main () at .../gdb.threads/kill.c:52
(gdb) kill
Kill the program being debugged? (y or n) y
Remote connection closed
^^^^^^^^^^^^^^^^^^^^^^^^
(gdb) FAIL: gdb.threads/kill.exp: kill
Extended remote should remain connected after the kill.
gdb/gdbserver/
2014-07-11 Pedro Alves <palves@redhat.com>
* linux-low.c (kill_wait_lwp): New function, based on
kill_one_lwp_callback, but use my_waitpid directly.
(kill_one_lwp_callback, linux_kill): Use it.
gdb/testsuite/
2014-07-11 Pedro Alves <palves@redhat.com>
* gdb.threads/kill.c: New file.
* gdb.threads/kill.exp: New file.
This patch fixes this on x86 Linux:
(gdb) watch *buf@2
Hardware watchpoint 8: *buf@2
(gdb) si
0x00000000004005a7 34 for (i = 0; i < 100000; i++); /* stepi line */
(gdb) del
Delete all breakpoints? (y or n) y
(gdb) watch *(buf+1)@1
Hardware watchpoint 9: *(buf+1)@1
(gdb) si
0x00000000004005a7 in main () at ../../../src/gdb/testsuite/gdb.base/watchpoint-reuse-slot.c:34
34 for (i = 0; i < 100000; i++); /* stepi line */
Couldn't write debug register: Invalid argument.
(gdb)
In the example above the debug registers are being switched from this
state:
CONTROL (DR7): 0000000000050101 STATUS (DR6): 0000000000000000
DR0: addr=0x0000000000601040, ref.count=1 DR1: addr=0x0000000000000000, ref.count=0
DR2: addr=0x0000000000000000, ref.count=0 DR3: addr=0x0000000000000000, ref.count=0
to this:
CONTROL (DR7): 0000000000010101 STATUS (DR6): 0000000000000000
DR0: addr=0x0000000000601041, ref.count=1 DR1: addr=0x0000000000000000, ref.count=0
DR2: addr=0x0000000000000000, ref.count=0 DR3: addr=0x0000000000000000, ref.count=0
That is, before, DR7 was setup for watching a 2 byte region starting
at what's in DR0 (0x601040).
And after, DR7 is setup for watching a 1 byte region starting at
what's in DR0 (0x601041).
We always write DR0..DR3 before DR7, because if we enable a slot's
bits in DR7, you need to have already written the corresponding
DR0..DR3 registers -- the kernel rejects the DR7 write with EINVAL
otherwise.
The error shown above is the opposite scenario. When we try to write
0x601041 to DR0, DR7's bits still indicate intent of watching a 2-byte
region. That DR0/DR7 combination is invalid, because 0x601041 is
unaligned. To watch two bytes, we'd have to use two slots. So the
kernel errors out with EINVAL.
Fix this by always first clearing DR7, then writing DR0..DR3, and then
setting DR7's bits.
A little optimization -- if we're disabling the last watchpoint, then
we can clear DR7 just once. The changes to nat/i386-dregs.c make that
easier to detect, and as bonus, they make it a little easier to make
sense of DR7 in the debug logs, as we no longer need to remember we're
seeing stale bits.
Tested on x86_64 Fedora 20, native and GDBserver.
This adds an exhaustive test that switches between many different
combinations of watchpoint types and addresses and widths.
gdb/
2014-06-23 Pedro Alves <palves@redhat.com>
* amd64-linux-nat.c (amd64_linux_prepare_to_resume): Clear
DR_CONTROL before setting DR0..DR3.
* i386-linux-nat.c (i386_linux_prepare_to_resume): Likewise.
* nat/i386-dregs.c (i386_remove_aligned_watchpoint): Clear all
bits of DR_CONTROL related to the debug register slot being
disabled. If all slots are vacant, clear local slowdown as well,
and assert DR_CONTROL is 0.
gdb/gdbserver/
2014-06-23 Pedro Alves <palves@redhat.com>
* linux-x86-low.c (x86_linux_prepare_to_resume): Clear DR_CONTROL
before setting DR0..DR3.
gdb/testsuite/
2014-06-23 Pedro Alves <palves@redhat.com>
* gdb.base/watchpoint-reuse-slot.c: New file.
* gdb.base/watchpoint-reuse-slot.exp: New file.
This commit makes gdbserver access the x86 debug register accessor
functions via the same function vector as GDB proper. This removes
a chunk of conditional code that was previously in i386-{nat,low}.h
and leaves a single macro as the only GDB/gdbserver difference in
nat/i386-dregs.c.
gdb/
2014-06-20 Gary Benson <gbenson@redhat.com>
* i386-nat.h (debug_hw_points): Moved to nat/i386-dregs.c.
(i386_dr_low_type): Moved to nat/i386-dregs.h.
(i386_dr_low): Likewise.
(i386_dr_low_can_set_addr): Moved to nat/i386-dregs.c.
(i386_dr_low_set_addr): Likewise.
(i386_dr_low_get_addr): Likewise.
(i386_dr_low_can_set_control): Likewise.
(i386_dr_low_set_control): Likewise.
(i386_dr_low_get_control): Likewise.
(i386_dr_low_get_status): Likewise.
(i386_get_debug_register_length): Likewise.
* nat/i386-dregs.h (i386_dr_low_type): Moved from i386-nat.h.
(i386_dr_low): Likewise.
* nat/i386-dregs.c (i386-low.h): Remove include.
(i386-nat.h): Likewise.
(nat/i386-dregs.h): New include.
(i386_dr_low_can_set_addr): Moved from i386-nat.h.
(i386_dr_low_set_addr): Likewise.
(i386_dr_low_get_addr): Likewise.
(i386_dr_low_can_set_control): Likewise.
(i386_dr_low_set_control): Likewise.
(i386_dr_low_get_control): Likewise.
(i386_dr_low_get_status): Likewise.
(i386_get_debug_register_length): Likewise.
(debug_hw_points): Likewise.
gdb/gdbserver/
2014-06-20 Gary Benson <gbenson@redhat.com>
* i386-low.h (i386_dr_low_can_set_addr): Removed.
(i386_dr_low_set_addr): Likewise.
(i386_dr_low_get_addr): Likewise.
(i386_dr_low_can_set_control): Likewise.
(i386_dr_low_set_control): Likewise.
(i386_dr_low_get_control): Likewise.
(i386_dr_low_get_status): Likewise.
(i386_get_debug_register_length): Likewise.
* linux-x86-low.c (i386_dr_low_set_addr):
Changed signature. Made static.
(i386_dr_low_get_addr): Likewise.
(i386_dr_low_set_control): Likewise.
(i386_dr_low_get_control): Likewise.
(i386_dr_low_get_status): Likewise.
(i386_dr_low): New global variable.
* win32-i386-low.c (i386_dr_low_set_addr):
Changed signature. Made static.
(i386_dr_low_get_addr): Likewise.
(i386_dr_low_set_control): Likewise.
(i386_dr_low_get_control): Likewise.
(i386_dr_low_get_status): Likewise.
(i386_dr_low): New global variable.
The recent libiberty patch caused issues when cross building
gdbserver. The Makefile ends invoking the build machine's "ar"
instead of the --host version:
ar ./libiberty.a \
./regex.o (...)
ar: illegal option -- .
Usage: ar [emulation options] [-]{dmpqrstx}[abcfilNoPsSuvV] [member-name] [count] archive-file file...
ar -M [<mri-script]
The libiberty configure script does probe for and finds an appropriate
AR. However, gdbserver's configure does not probe for AR and
overrides the AR used in the libiberty build by explicitly passing AR
to the sub-builds.
gdb/gdbserver/
2014-06-20 Marcus Shawcroft <marcus.shawcroft@arm.com>
* configure.ac: Invoke. AC_CHECK_TOOL(AR, ar).
* Makefile.in (AR, AR_FLAGS): Define.
* configure: Regenerate.
The above commit did two things:
1) A number of functions were renamed and made nonstatic.
2) A number of other functions were renamed only.
This commit reverts #1 but not #2. In addition, prototypes for
functions now remade static have been removed from i386-dregs.h.
gdb/
2014-06-19 Gary Benson <gbenson@redhat.com>
* i386-nat.c (i386_dr_show): Renamed to
i386_show_dr and made static. All uses updated.
(i386_dr_length_and_rw_bits): Renamed to
i386_length_and_rw_bits and made static.
All uses updated.
(i386_dr_insert_aligned_watchpoint): Renamed to
i386_insert_aligned_watchpoint and made static.
All uses updated.
(i386_dr_remove_aligned_watchpoint): Renamed to
i386_remove_aligned_watchpoint and made static.
All uses updated.
(i386_dr_update_inferior_debug_regs): Renamed to
i386_update_inferior_debug_regs and made static.
All uses updated.
* nat/i386-dregs.h (i386_dr_show): Removed.
(i386_dr_length_and_rw_bits): Likewise.
(i386_dr_insert_aligned_watchpoint): Likewise.
(i386_dr_remove_aligned_watchpoint): Likewise.
(i386_dr_update_inferior_debug_regs): Likewise.
gdb/gdbserver/
2014-06-19 Gary Benson <gbenson@redhat.com>
* i386-low.c (i386_dr_show): Renamed to
i386_show_dr and made static. All uses updated.
(i386_dr_length_and_rw_bits): Renamed to
i386_length_and_rw_bits and made static.
All uses updated.
(i386_dr_insert_aligned_watchpoint): Renamed to
i386_insert_aligned_watchpoint and made static.
All uses updated.
(i386_dr_remove_aligned_watchpoint): Renamed to
i386_remove_aligned_watchpoint and made static.
All uses updated.
(i386_dr_update_inferior_debug_regs): Renamed to
i386_update_inferior_debug_regs and made static.
All uses updated.
Edjunior Barbosa Machado
James Hogan
Gary Benson
Tom Tromey
Pedro Alves
Marcus Shawcroft