Now that all users of the target method 'fbsd_make_corefile_notes'
have been converted to the version in fbsd-tdep.c, the old method is
removed.
gdb/ChangeLog:
* fbsd-nat.c (find_signalled_thread, find_stop_signal)
(fbsd_collect_regset_section_cb, fbsd_make_corefile_notes):
Remove.
* fbsd-nat.h (fbsd_make_corefile_notes): Remove prototype.
For TILE-Gx GNU/Linux targets, no longer define the gdbarch method
'regset_from_core_section', but the iterator method instead.
gdb/ChangeLog:
* tilegx-linux-tdep.c (TILEGX_LINUX_SIZEOF_GREGSET): New macro.
(tilegx_regset_from_core_section): Remove.
(tilegx_iterate_over_regset_sections): New.
(tilegx_linux_init_abi): Adjust gdbarch initialization.
For Super-H targets, no longer define the gdbarch method
'regset_from_core_section', but the iterator method instead.
gdb/ChangeLog:
* sh-linux-tdep.c (sh_linux_init_abi): Set tdep fields
'sizeof_gregset' and 'sizeof_fpregset'.
* sh-tdep.c (sh_regset_from_core_section): Remove.
(sh_iterate_over_regset_sections): New.
(sh_gdbarch_init): Adjust gdbarch initialization.
* sh-tdep.h (struct gdbarch_tdep): New fields sizeof_gregset and
sizeof_fpregset.
* shnbsd-tdep.c (shnbsd_init_abi): Set tdep field
'sizeof_gregset'.
For Nios II GNU/Linux targets, no longer define the gdbarch method
'regset_from_core_section', but the iterator method instead.
gdb/ChangeLog:
* nios2-linux-tdep.c (NIOS2_GREGS_SIZE): New macro.
(nios2_regset_from_core_section): Remove.
(nios2_iterate_over_regset_sections): New.
(nios2_linux_init_abi): Adjust gdbarch initialization.
Don't define the 'regset_from_core_section' method, but the iterator
method instead. Do this for GNU/Linux- as well as
Net/OpenBSD-targets. In the case of GNU/Linux this should enable
non-native use of the 'generate-core-file' command.
gdb/ChangeLog:
* alpha-linux-tdep.c (alpha_linux_regset_from_core_section): Remove.
(alpha_linux_iterate_over_regset_sections): New.
(alpha_linux_init_abi): Adjust gdbarch initialization.
* alphabsd-tdep.h (alphanbsd_regset_from_core_section): Remove
prototype.
(alphanbsd_iterate_over_regset_sections): New prototype.
* alphafbsd-tdep.c (alphafbsd_init_abi): Add comment for missing
fbsd_init_abi invocation.
* alphanbsd-tdep.c (alphanbsd_supply_gregset): Move below
alphanbsd_aout_supply_gregset. Invoke the latter for the
appropriate size.
(alphanbsd_aout_gregset): Remove.
(alphanbsd_regset_from_core_section): Remove.
(alphanbsd_iterate_over_regset_sections): New.
(alphanbsd_init_abi): Adjust gdbarch initialization.
* alphaobsd-tdep.c (alphaobsd_init_abi): Likewise.
Don't define the 'regset_from_core_section' method, but the iterator
method instead. This slightly reduces the code and enables non-native
use of the 'generate-core-file' command.
Also, when all instances of 'regset_from_core_section' are replaced,
it can be dropped from the gdbarch interface.
gdb/ChangeLog:
* aarch64-linux-tdep.c (aarch64_linux_regset_from_core_section):
Remove.
(aarch64_linux_iterate_over_regset_sections): New.
(aarch64_linux_init_abi): Adjust gdbarch initialization.
This creates a new version of the FreeBSD core file note generation
logic in the new target-dependent file "fbsd-tdep.c". The new version
is mostly copied from "fbsd-nat.c", but uses the iterator instead of
regset_from_core_section and defines fbsd_make_corefile_notes as a
gdbarch method instead of a target method.
Consecutive architecture-dependent changes exploit the new version,
migrating away from the target method. When all FreeBSD targets are
changed, the target method can go away.
gdb/ChangeLog:
* fbsd-tdep.c: New file.
* fbsd-tdep.h: New file.
* Makefile.in (ALL_TARGET_OBS): Add fbsd-tdep.o.
(HFILES_NO_SRCDIR): Add fbsd-tdep.h.
(ALLDEPFILES): Add fbsd-tdep.c.
This adds the 'regset' parameter to the iterator callback.
Consequently the 'regset_from_core_section' method is dropped for all
targets that provide the iterator method.
This change prepares for replacing regset_from_core_section
everywhere, thereby eliminating one gdbarch interface. Since the
iterator is usually no more complex than regset_from_core_section
alone, targets that previously didn't define core_regset_sections will
then gain multi-arch capable core file generation support without
increased complexity.
gdb/ChangeLog:
* gdbarch.sh (iterate_over_regset_sections_cb): Add regset
parameter.
* gdbarch.h: Regenerate.
* corelow.c (sniff_core_bfd): Don't sniff if gdbarch has a regset
iterator.
(get_core_register_section): Add parameter 'regset' and use it, if
set. Add parameter 'min_size' and verify the bfd section size
against it.
(get_core_registers_cb): Add parameter 'regset' and pass it to
get_core_register section. For the "standard" register sections
".reg" and ".reg2", set an appropriate default for human_name.
(get_core_registers): Don't abort when the gdbarch has an iterator
but no regset_from_core_section. Add NULL/0 for parameters
'regset'/'min_size' in calls to get_core_register_section.
* linux-tdep.c (linux_collect_regset_section_cb): Add parameter
'regset' and use it instead of calling the
regset_from_core_section gdbarch method.
* i386-tdep.h (struct gdbarch_tdep): Add field 'fpregset'.
* i386-tdep.c (i386_supply_xstateregset)
(i386_collect_xstateregset, i386_xstateregset): Moved to
i386-linux-tdep.c.
(i386_regset_from_core_section): Drop handling for .reg-xfp and
.reg-xstate.
(i386_gdbarch_init): Set tdep field 'fpregset'. Enable generic
core file support only if the regset iterator hasn't been set.
* i386-linux-tdep.c (i386_linux_supply_xstateregset)
(i386_linux_collect_xstateregset, i386_linux_xstateregset): New.
Moved from i386-tdep.c and renamed to *_linux*.
(i386_linux_iterate_over_regset_sections): Add regset parameter to
each callback invocation. Allow any .reg-xstate size when reading
from a core file.
* amd64-tdep.c (amd64_supply_xstateregset)
(amd64_collect_xstateregset, amd64_xstateregset): Moved to
amd64-linux-tdep.c.
(amd64_regset_from_core_section): Remove.
(amd64_init_abi): Set new tdep field 'fpregset'. No longer
install an amd64-specific regset_from_core_section gdbarch method.
* amd64-linux-tdep.c (amd64_linux_supply_xstateregset)
(amd64_linux_collect_xstateregset, amd64_linux_xstateregset): New.
Moved from amd64-tdep.c and renamed to *_linux*.
(amd64_linux_iterate_over_regset_sections): Add regset parameter
to each callback invocation. Allow any .reg-xstate size when
reading from a core file.
* arm-linux-tdep.c (arm_linux_regset_from_core_section): Remove.
(arm_linux_iterate_over_regset_sections): Add regset parameter to
each callback invocation.
(arm_linux_init_abi): No longer set the regset_from_core_section
gdbarch method.
* ppc-linux-tdep.c (ppc_linux_regset_from_core_section): Remove.
(ppc_linux_iterate_over_regset_sections): Add regset parameter to
each callback invocation.
(ppc_linux_init_abi): No longer set the regset_from_core_section
gdbarch method.
* s390-linux-tdep.c (struct gdbarch_tdep): Remove the fields
gregset, sizeof_gregset, fpregset, and sizeof_fpregset.
(s390_regset_from_core_section): Remove.
(s390_iterate_over_regset_sections): Add regset parameter to each
callback invocation.
(s390_gdbarch_init): No longer set the regset_from_core_section
gdbarch method. Drop initialization of deleted tdep fields.
The core_regset_sections list in gdbarch (needed for multi-arch
capable core file generation support) is replaced by an iterator
method. Overall, this reduces the code a bit, and it allows for more
flexibility.
gdb/ChangeLog:
* amd64-linux-tdep.c (amd64_linux_regset_sections): Remove.
(amd64_linux_iterate_over_regset_sections): New.
(amd64_linux_init_abi_common): Don't install the regset section
list, but the new iterator in gdbarch.
* arm-linux-tdep.c (arm_linux_fpa_regset_sections)
(arm_linux_vfp_regset_sections): Remove. Move combined logic...
(arm_linux_iterate_over_regset_sections): ...here. New function.
(arm_linux_init_abi): Set iterator instead of section list.
* corelow.c (get_core_registers_cb): New function, logic moved
from...
(get_core_registers): ...loop body here. Use new iterator method
instead of walking through the regset section list.
* gdbarch.sh: Remove 'core_regset_sections'. New method
'iterate_over_regset_sections'. New typedef
'iterate_over_regset_sections_cb'.
* gdbarch.c: Regenerate.
* gdbarch.h: Likewise.
* i386-linux-tdep.c (i386_linux_regset_sections)
(i386_linux_sse_regset_sections, i386_linux_avx_regset_sections):
Remove.
(i386_linux_iterate_over_regset_sections): New.
(i386_linux_init_abi): Don't choose a regset section list, but
install new iterator in gdbarch.
* linux-tdep.c (struct linux_collect_regset_section_cb_data): New.
(linux_collect_regset_section_cb): New function, logic moved
from...
(linux_collect_thread_registers): ...loop body here. Use iterator
method instead of walking through list.
(linux_make_corefile_notes_1): Check for presence of iterator
method instead of regset section list.
* ppc-linux-tdep.c (ppc_linux_vsx_regset_sections)
(ppc_linux_vmx_regset_sections, ppc_linux_fp_regset_sections)
(ppc64_linux_vsx_regset_sections, ppc64_linux_vmx_regset_sections)
(ppc64_linux_fp_regset_sections): Remove. Move combined logic...
(ppc_linux_iterate_over_regset_sections): ...here. New function.
(ppc_linux_init_abi): Don't choose from above regset section
lists, but install new iterator in gdbarch.
* regset.h (struct core_regset_section): Remove.
* s390-linux-tdep.c (struct gdbarch_tdep): Add new fields
have_linux_v1, have_linux_v2, and have_tdb.
(s390_linux32_regset_sections, s390_linux32v1_regset_sections)
(s390_linux32v2_regset_sections, s390_linux64_regset_sections)
(s390_linux64v1_regset_sections, s390_linux64v2_regset_sections)
(s390x_linux64_regset_sections, s390x_linux64v1_regset_sections)
(s390x_linux64v2_regset_sections): Remove. Move combined logic...
(s390_iterate_over_regset_sections): ...here. New function. Use
new tdep fields.
(s390_gdbarch_init): Set new tdep fields. Don't choose from above
regset section lists, but install new iterator.
I see the following fails on arm-linux-gnueabi,
result of ldd build-git/arm/gdb/testsuite/gdb.threads/dlopen-libpthread.so is 1
output of ldd build-git/arm/gdb/testsuite/gdb.threads/dlopen-libpthread.so is not a dynamic executable
child process exited abnormally
FAIL: gdb.threads/dlopen-libpthread.exp: ldd dlopen-libpthread.so
FAIL: gdb.threads/dlopen-libpthread.exp: ldd dlopen-libpthread.so output contains libs
the test script invokes ldd (on host) for the target libraries, which
is wrong. ldd can't be cross because it invokes dynamic linker with
LD_TRACE_LOADED_OBJECTS and gets the dependent libraries. My first
reaction to this problem is to execute ld.so on the target (like
remote_exec target). When I start to hack proc build_executable_own_libs,
I find it has assumptions here and there that the native testing is
performed. Then I check the callers of build_executable_own_libs,
and they are all skipped if isnative is false. It is reasonable to do
the same in dlopen-libpthread.exp too.
gdb/testsuite:
2014-09-30 Yao Qi <yao@codesourcery.com>
* gdb.threads/dlopen-libpthread.exp: Skip it if isnative is
false.
commit 2268b414f4
added file "features/library-list-svr4.dtd" but the added code uses
"library-list.dtd" instead.
Curiously after changing for a test s/name/nXme/ in the DTD making the
gdbserver output non-conforming there is no warning or regression seen (tested
gdb.base/shlib-call.exp, using_xfer is still 1). I did not check more why the
DTD conformance verification does not work.
gdb/ChangeLog
2014-09-29 Jan Kratochvil <jan.kratochvil@redhat.com>
* solib-svr4.c (svr4_parse_libraries): Use "library-list-svr4.dtd".
Remove the pruning of program spaces in print_program_space to remove
unwanted side-effects. "info" commands and print routines should
generally not change the state of the debugger.
gdb/Changelog:
* progspace.c (print_program_space): Don't prune program spaces
before printing them.
What matters for this function, is whether the user requested a
"step", for "set scheduler-locking step", not whether GDB is doing an
internal step for some reason.
/* Return a ptid representing the set of threads that we will proceed,
in the perspective of the user/frontend. */
extern ptid_t user_visible_resume_ptid (int step);
Therefore, the check for singlestep_breakpoints_inserted_p is actually
incorrect, and we end up applying schedlock more often on sss targets
than on non-sss targets.
Found by inspection while working on a patch that eliminates the
singlestep_breakpoints_inserted_p global.
Tested on x86_64 Fedora 20 on top of my 'software single-step on x86'
series.
gdb/
2014-09-25 Pedro Alves <palves@redhat.com>
* infrun.c (user_visible_resume_ptid): Don't check
singlestep_breakpoints_inserted_p.
gdb/
2014-09-25 Pedro Alves <palves@redhat.com>
* infrun.c (stepping_past_instruction_at)
(clear_exit_convenience_vars): Point at infrun.h instead of
inferior.h.
(handle_signal_stop): Fix typo.
This patch fixes a typo in the bit mask I've made in my previous code
refactor. If PC is in the register list, the bit 8 is one, so bit
mask 0xff00 should be used. Current condition is a constant false.
gdb:
2014-09-24 Yao Qi <yao@codesourcery.com>
* arm-tdep.c (thumb_in_function_epilogue_p): Fix typo in the
bitmask.
I see the following fail on arm-none-linux-gnueabi testing,
(gdb) continue^M
Continuing.^M
^M
Program received signal SIGILL, Illegal instruction.^M
[Switching to Thread 1003]^M
handler (signo=10) at
/scratch/yqi/arm-none-linux-gnueabi/src/gdb-trunk/gdb/testsuite/gdb.threads/sigstep-threads.c:33^M
33 tgkill (getpid (), gettid (), SIGUSR1); /* step-2 */^M
(gdb) FAIL: gdb.threads/sigstep-threads.exp: continue
the cause is that GDBserver doesn't cancel the breakpoint if the stop
signal is SIGILL. The kernel used here is a little old, 2.6.x, and
doesn't translate SIGILL to SIGTRAP when program hits breakpoint
instruction (which is an illegal instruction actually). GDB and
GDBserver can translate SIGILL to SIGTRAP under certain circumstance,
so it is not a problem here. See gdbserver/linux-low.c:linux_wait_1
/* If this event was not handled before, and is not a SIGTRAP, we
report it. SIGILL and SIGSEGV are also treated as traps in case
a breakpoint is inserted at the current PC. If this target does
not support internal breakpoints at all, we also report the
SIGTRAP without further processing; it's of no concern to us. */
maybe_internal_trap
= (supports_breakpoints ()
&& (WSTOPSIG (w) == SIGTRAP
|| ((WSTOPSIG (w) == SIGILL
|| WSTOPSIG (w) == SIGSEGV)
&& (*the_low_target.breakpoint_at) (event_child->stop_pc))));
However, SIGILL and SIGSEGV is not considered when cancelling
breakpoint, which causes the fail above. That is, when GDB is doing
software single step on address ADDR, both thread A and thread B hits the
software single step breakpoint, and get SIGILL. GDB selects the event
from thread A, removes the software single step breakpoint, and resume
the program. The event (SIGILL) from thread B is reported to GDB, but
GDB doesn't regard this SIGILL as SIGTRAP, because the breakpoint on
address ADDR was removed, so GDB reports "Program received signal
SIGILL".
The patch is to allow calling cancel_breakpoint if the signal is
SIGILL and SIGSEGV. This patch fixes the fail above. Likewise, event
lwp selection should honour SIGILL and SIGSEGV too.
gdb/gdbserver:
2014-09-23 Yao Qi <yao@codesourcery.com>
* linux-low.c (lp_status_maybe_breakpoint): New function.
(linux_low_filter_event): Call lp_status_maybe_breakpoint.
(count_events_callback): Likewise.
(select_event_lwp_callback): Likewise.
(cancel_breakpoints_callback): Likewise.
This commit renames target_stop_ptid as target_stop_and_wait and
target_continue_ptid as target_continue_no_signal. Comments are
updated to more fully describe the functions' behaviour.
gdb/ChangeLog:
* target/target.h (target_stop_ptid): Renamed as...
(target_stop_and_wait): New function. Updated comment.
All uses updated.
(target_continue_ptid): Renamed as...
(target_continue_no_signal): New function. Updated comment.
All uses updated.
By default, GDB removes all breakpoints from the target when the
target stops and the prompt is given back to the user. This is useful
in case GDB crashes while the user is interacting, as otherwise,
there's a higher chance breakpoints would be left planted on the
target.
But, as long as any thread is running free, we need to make sure to
keep breakpoints inserted, lest a thread misses a breakpoint. With
that in mind, in preparation for non-stop mode, we added a "breakpoint
always-inserted on" mode. This traded off the extra crash protection
for never having threads miss breakpoints, and in addition is more
efficient if there's a ton of breakpoints to remove/insert at each
user command (e.g., at each "step").
When we added non-stop mode, and for a period, we required users to
manually set "always-inserted on" when they enabled non-stop mode, as
otherwise GDB removes all breakpoints from the target as soon as any
thread stops, which means the other threads still running will miss
breakpoints. The test added by this patch exercises this.
That soon revealed a nuisance, and so later we added an extra
"breakpoint always-inserted auto" mode, that made GDB behave like
"always-inserted on" when non-stop was enabled, and "always-inserted
off" when non-stop was disabled. "auto" was made the default at the
same time.
In hindsight, this "auto" setting was unnecessary, and not the ideal
solution. Non-stop mode does depends on breakpoints always-inserted
mode, but only as long as any thread is running. If no thread is
running, no breakpoint can be missed. The same is true for all-stop
too. E.g., if, in all-stop mode, and the user does:
(gdb) c&
(gdb) b foo
That breakpoint at "foo" should be inserted immediately, but it
currently isn't -- currently it'll end up inserted only if the target
happens to trip on some event, and is re-resumed, e.g., an internal
breakpoint triggers that doesn't cause a user-visible stop, and so we
end up in keep_going calling insert_breakpoints. The test added by
this patch also covers this.
IOW, no matter whether in non-stop or all-stop, if the target fully
stops, we can remove breakpoints. And no matter whether in all-stop
or non-stop, if any thread is running in the target, then we need
breakpoints to be immediately inserted. And then, if the target has
global breakpoints, we need to keep breakpoints even when the target
is stopped.
So with that in mind, and aiming at reducing all-stop vs non-stop
differences for all-stop-on-stop-of-non-stop, this patch fixes
"breakpoint always-inserted off" to not remove breakpoints from the
target until it fully stops, and then removes the "auto" setting as
unnecessary. I propose removing it straight away rather than keeping
it as an alias, unless someone complains they have scripts that need
it and that can't adjust.
Tested on x86_64 Fedora 20.
gdb/
2014-09-22 Pedro Alves <palves@redhat.com>
* NEWS: Mention merge of "breakpoint always-inserted" modes "off"
and "auto" merged.
* breakpoint.c (enum ugll_insert_mode): New enum.
(always_inserted_mode): Now a plain boolean.
(show_always_inserted_mode): No longer handle AUTO_BOOLEAN_AUTO.
(breakpoints_always_inserted_mode): Delete.
(breakpoints_should_be_inserted_now): New function.
(insert_breakpoints): Pass UGLL_INSERT to
update_global_location_list instead of calling
insert_breakpoint_locations manually.
(create_solib_event_breakpoint_1): New, factored out from ...
(create_solib_event_breakpoint): ... this.
(create_and_insert_solib_event_breakpoint): Use
create_solib_event_breakpoint_1 instead of calling
insert_breakpoint_locations manually.
(update_global_location_list): Change parameter type from boolean
to enum ugll_insert_mode. All callers adjusted. Adjust to use
breakpoints_should_be_inserted_now and handle UGLL_INSERT.
(update_global_location_list_nothrow): Change parameter type from
boolean to enum ugll_insert_mode.
(_initialize_breakpoint): "breakpoint always-inserted" option is
now a boolean command. Update help text.
* breakpoint.h (breakpoints_always_inserted_mode): Delete declaration.
(breakpoints_should_be_inserted_now): New declaration.
* infrun.c (handle_inferior_event) <TARGET_WAITKIND_LOADED>:
Remove breakpoints_always_inserted_mode check.
(normal_stop): Adjust to use breakpoints_should_be_inserted_now.
* remote.c (remote_start_remote): Likewise.
gdb/doc/
2014-09-22 Pedro Alves <palves@redhat.com>
* gdb.texinfo (Set Breaks): Document that "set breakpoint
always-inserted off" is the default mode now. Delete
documentation of "set breakpoint always-inserted auto".
gdb/testsuite/
2014-09-22 Pedro Alves <palves@redhat.com>
* gdb.threads/break-while-running.exp: New file.
* gdb.threads/break-while-running.c: New file.
This adds a new mode for update_global_location_list, that allows
callers saying "please insert breakpoints, even if
breakpoints_always_inserted_mode() is false". This allows removing a
couple breakpoints_always_inserted_mode checks.
gdb/
2014-09-22 Pedro Alves <palves@redhat.com>
* breakpoint.c (enum ugll_insert_mode): Add UGLL_INSERT.
(insert_breakpoints): Don't call insert_breakpoint_locations here.
Instead, pass UGLL_INSERT to update_global_location_list.
(update_global_location_list): Change parameter type from boolean
to enum ugll_insert_mode. All callers adjusted. Adjust to use
breakpoints_should_be_inserted_now and handle UGLL_INSERT.
(create_solib_event_breakpoint_1): New, factored out from ...
(create_solib_event_breakpoint): ... this.
(create_and_insert_solib_event_breakpoint): Use
create_solib_event_breakpoint_1 instead of calling
insert_breakpoint_locations manually.
(update_global_location_list): Handle UGLL_INSERT.
Later we'll want a tristate, but for now, convert to an enum that maps 1-1
with the current boolean's true/false.
gdb/
2014-09-22 Pedro Alves <palves@redhat.com>
* breakpoint.c (enum ugll_insert_mode): New enum.
(update_global_location_list)
(update_global_location_list_nothrow): Change parameter type from
boolean to enum ugll_insert_mode. All callers adjusted.
This commit implements functions for identifying and extracting extended
ptrace event information from a Linux wait status. These are just
convenience functions intended to hide the ">> 16" used to extract the
event from the wait status word, replacing the hard-coded shift with a more
descriptive function call. This is preparatory work for implementation of
follow-fork and detach-on-fork for extended-remote linux targets.
gdb/ChangeLog:
* linux-nat.c (linux_handle_extended_wait): Call
linux_ptrace_get_extended_event.
(wait_lwp): Call linux_is_extended_waitstatus.
(linux_nat_filter_event): Call linux_ptrace_get_extended_event
and linux_is_extended_waitstatus.
* nat/linux-ptrace.c (linux_test_for_tracefork): Call
linux_ptrace_get_extended_event.
(linux_ptrace_get_extended_event): New function.
(linux_is_extended_waitstatus): New function.
* nat/linux-ptrace.h (linux_ptrace_get_extended_event)
(linux_is_extended_waitstatus): New declarations.
gdb/gdbserver/ChangeLog:
* linux-low.c (handle_extended_wait): Call
linux_ptrace_get_extended_event.
(get_stop_pc, get_detach_signal, linux_low_filter_event): Call
linux_is_extended_waitstatus.
---
This patch is to extend dw2-var-zero-add.exp to cover the case that
partial symtabl is not used while full symtab is used, in order to
cover the changes in patch 2/3. This patch restarts GDB with
--readnow and does the same test again.
gdb/testsuite:
2014-09-19 Yao Qi <yao@codesourcery.com>
* gdb.dwarf2/dw2-var-zero-addr.exp: Move test into new proc test.
Invoke test. Restart GDB with --readnow and invoke test again.
I see the following fail on arm-none-eabi target,
(gdb) b 24^M
Breakpoint 1 at 0x4: file
../../../../git/gdb/testsuite/gdb.base/break-on-linker-gcd-function.cc,
line 24.^M
(gdb) FAIL: gdb.base/break-on-linker-gcd-function.exp: b 24
Currently, we are using flag has_section_at_zero to determine whether
address zero in debug info means the corresponding code has been
GC'ed, like this:
case DW_LNE_set_address:
address = read_address (abfd, line_ptr, cu, &bytes_read);
if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
{
/* This line table is for a function which has been
GCd by the linker. Ignore it. PR gdb/12528 */
However, this is incorrect on some bare metal targets, as .text
section is located at 0x0, so dwarf2_per_objfile->has_section_at_zero
is true. If a function is GC'ed by linker, the address is zero. GDB
thinks address zero is a function's address rather than this function
is GC'ed.
In this patch, we choose 'lowpc' got in read_file_scope to check
whether 'lowpc' is greater than zero. If it isn't, address zero really
means the function is GC'ed. In this patch, we pass 'lowpc' in
read_file_scope through handle_DW_AT_stmt_list and dwarf_decode_lines,
and to dwarf_decode_lines_1 finally.
This patch fixes the fail above. This patch also covers the path that
partial symbol isn't used, which is tested by starting gdb with
--readnow option.
It is regression tested on x86-linux with
target_board=dwarf4-gdb-index, and arm-none-eabi. OK to apply?
gdb:
2014-09-19 Yao Qi <yao@codesourcery.com>
* dwarf2read.c (dwarf_decode_lines): Update declaration.
(handle_DW_AT_stmt_list): Add argument 'lowpc'. Update
comments. Callers update.
(dwarf_decode_lines): Likewise.
(dwarf_decode_lines_1): Add argument 'lowpc'. Update
comments. Skip the line table if 'lowpc' is greater than
'address'. Don't check
dwarf2_per_objfile->has_section_at_zero.
gdb/testsuite:
2014-09-19 Yao Qi <yao@codesourcery.com>
* gdb.base/break-on-linker-gcd-function.exp: Move test into new
proc set_breakpoint_on_gcd_function. Invoke
set_breakpoint_on_gcd_function. Restart GDB with --readnow and
invoke set_breakpoint_on_gcd_function again.
If accessing memory via safe_read_memory_integer fails, that function
used to print an error message even though callers were perfectly able
to handle (and even expected!) failures.
This patch removes the confusing message by changing the routine to
directly use target_read_memory.
gdb/ChangeLog:
PR gdb/17384
* corefile.c (struct captured_read_memory_integer_arguments): Remove.
(do_captured_read_memory_integer): Remove.
(safe_read_memory_integer): Use target_read_memory directly instead
of catching errors in do_captured_read_memory_integer.
This is just a testcase addition that I am proposing for upstream GDB.
We have this in our internal tree, and the related RH bug is:
<https://bugzilla.redhat.com/show_bug.cgi?id=809179>
(You might not be able to see all the comments without privileges.)
This bug is about a global variable that got incorrectly displayed by
GDB. This bug has already been fixed a long time ago by Joel's
commit:
commit 19630284f5
Author: Joel Brobecker <brobecker@gnat.com>
Date: Tue Jun 5 13:50:50 2012 +0000
But I think a testcase for it wouldn't hurt.
So, consider the following scenario:
$ cat solib1.c
int test;
void c_main (void)
{
test = 42;
}
$ cat solib2.c
int test;
void b_main (void)
{
test = 42;
}
$ cat main.c
int main (int argc, char *argv[])
{
c_main ();
b_main ();
return 0;
}
$ gcc -g -fPIC -shared -o libSO1.so -c solib1.c
$ gcc -g -fPIC -shared -o libSO2.so -c solib2.c
$ gcc -g -o main -L$PWD -lSO1 -lSO2 main.c
$ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main
...
$1 = 0
This happened with GDB before Joel's commit above. Now, things work
and GDB is able to correctly display the nested global variable:
$ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main
...
$1 = 42
The testcase attached tests this behavior.
gdb/testsuite/ChangeLog:
2014-09-16 Sergio Durigan Junior <sergiodj@redhat.com>
* gdb.base/global-var-nested-by-dso-solib1.c: New file.
* gdb.base/global-var-nested-by-dso-solib2.c: Likewise.
* gdb.base/global-var-nested-by-dso.c: Likewise.
* gdb.base/global-var-nested-by-dso.exp: Likewise.
In gdb/gdbserver/Makefile.in, IPAGENT_CFLAGS is defined using
an expression which references $(CPPFLAGS). But CPPFLAGS isn't
actually defined.
This patch first adds a CPPFLAGS definition, so as to inherit
the value passed at configure time (if any). And it then makes it
part of INTERNAL_CFLAGS_BASE, instead. There is no reason that
CPPFLAGS be useful for a certain class of source files, and not
the rest. This is also consistent with what's done in GDB.
gdb/gdbserver/ChangeLog:
* Makefile.in (CPPFLAGS): Define.
(INTERNAL_CFLAGS_BASE): Add ${CPPFLAGS}.
(IPAGENT_CFLAGS): Remove ${CPPFLAGS}.
Tested by rebuilding GDBserver with a dummy CPPFLAGS, and verifying
that the compilation command was altered as expected.
This obvious change removes dead code from objc-lang.c. I was
grepping for "fprintf (stderr..." and found this code between "#if
0".."#endif" blocks.
2014-09-16 Sergio Durigan Junior <sergiodj@redhat.com>
* objc-lang.c (find_implementation_from_class): Remove dead code.
This is an obvious replacement of "fprintf (stderr..." by
"fprintf_unfiltered (gdb_stdlog...", which is the standard to use in
these cases.
gdb/ChangeLog:
2014-09-16 Sergio Durigan Junior <sergiodj@redhat.com>
PR cli/7233
* linux-nat.c (linux_nat_wait_1): Replace "fprintf (stderr..." by
"fprintf_unfiltered (gdb_stdlog...)".
Andreas Arnez
Yao Qi
Jan Kratochvil
Simon Marchi
Pedro Alves
Jan-Benedict Glaw
Gary Benson
Joel Brobecker
Don Breazeal
Doug Evans
Ulrich Weigand
Sergio Durigan Junior
Maciej W. Rozycki