This commit fixes the regression on RHEL-5 systems introduced by
nat/linux-personality.c's check of HAVE_DECL_ADDR_NO_RANDOMIZE.
RHEL-5 systems define HAVE_DECL_ADDR_NO_RANDOMIZE as zero, so we
cannot use #ifndef; instead this patch uses the "#if !" construction.
The regression was reported by Ulrich Weigand here:
<https://sourceware.org/ml/gdb-patches/2015-01/msg00458.html>
gdb/ChangeLog
2015-01-16 Sergio Durigan Junior <sergiodj@redhat.com>
* nat/linux-personality.c: Replace "#ifndef
HAVE_DECL_ADDR_NO_RANDOMIZE" by "#if
!HAVE_DECL_ADDR_NO_RANDOMIZE", fixing a regression in RHEL-5
systems.
This patch moves the shared code present on
gdb/linux-nat.c:linux_nat_create_inferior and
gdb/gdbserver/linux-low.c:linux_create_inferior to
nat/linux-personality.c. This code is responsible for disabling
address space randomization based on user setting, and using
<sys/personality.h> to do that. I decided to put the prototype of the
maybe_disable_address_space_randomization on nat/linux-osdata.h
because it seemed the best place to put it.
I regression-tested this patch on Fedora 20 x86_64, and found no
regressions.
gdb/ChangeLog
2015-01-15 Sergio Durigan Junior <sergiodj@redhat.com>
* Makefile.in (HFILES_NO_SRCDIR): Add nat/linux-personality.h.
(linux-personality.o): New rule.
* common/common-defs.h: Include <stdint.h>.
* config/aarch64/linux.mh (NATDEPFILES): Include
linux-personality.o.
* config/alpha/alpha-linux.mh (NATDEPFILES): Likewise.
* config/arm/linux.mh (NATDEPFILES): Likewise.
* config/i386/linux64.mh (NATDEPFILES): Likewise.
* config/i386/linux.mh (NATDEPFILES): Likewise.
* config/ia64/linux.mh (NATDEPFILES): Likewise.
* config/m32r/linux.mh (NATDEPFILES): Likewise.
* config/m68k/linux.mh (NATDEPFILES): Likewise.
* config/mips/linux.mh (NATDEPFILES): Likewise.
* config/pa/linux.mh (NATDEPFILES): Likewise.
* config/powerpc/linux.mh (NATDEPFILES): Likewise.
* config/powerpc/ppc64-linux.mh (NATDEPFILES): Likewise.
* config/powerpc/spu-linux.mh (NATDEPFILES): Likewise.
* config/s390/linux.mh (NATDEPFILES): Likewise.
* config/sparc/linux64.mh (NATDEPFILES): Likewise.
* config/sparc/linux.mh (NATDEPFILES): Likewise.
* config/tilegx/linux.mh (NATDEPFILES): Likewise.
* config/xtensa/linux.mh (NATDEPFILES): Likewise.
* defs.h: Remove #include <stdint.h> (moved to
common/common-defs.h).
* linux-nat.c: Include nat/linux-personality.h. Remove #include
<sys/personality.h>; do not define ADDR_NO_RANDOMIZE (moved to
nat/linux-personality.c).
(linux_nat_create_inferior): Remove code to disable address space
randomization (moved to nat/linux-personality.c). Create cleanup
to disable address space randomization.
* nat/linux-personality.c: New file.
* nat/linux-personality.h: Likewise.
gdb/gdbserver/ChangeLog
2015-01-15 Sergio Durigan Junior <sergiodj@redhat.com>
* Makefile.in (SFILES): Add linux-personality.c.
(linux-personality.o): New rule.
* configure.srv (srv_linux_obj): Add linux-personality.o to the
list of objects to be built.
* linux-low.c: Include nat/linux-personality.h.
(linux_create_inferior): Remove code to disable address space
randomization (moved to ../nat/linux-personality.c). Create
cleanup to disable address space randomization.
This patch is to teach both GDB and GDBServer to detect 64-bit inferior
correctly. We find a problem that GDBServer is unable to detect on a
e5500 core processor. Current GDBServer assumes that MSR is a 64-bit
register, but MSR is a 32-bit register in Book III-E. This patch is
to fix this problem by checking the right bit in MSR, in order to handle
both Book III-S and Book III-E. In order to detect Book III-S and
Book III-E, we check the PPC_FEATURE_BOOKE from the host's HWCAP (by
getauxval on glibc >= 2.16. If getauxval doesn't exist, we implement
the fallback by parsing /proc/self/auxv), because it should an invariant
on the same machine cross different processes.
In order to share code, I add nat/ppc-linux.c for both GDB and
GDBserver side.
gdb:
2015-01-14 Yao Qi <yao@codesourcery.com>
* Makefile.in (ppc-linux.o): New rule.
* config/powerpc/ppc64-linux.mh (NATDEPFILES): Add ppc-linux.o.
* configure.ac: AC_CHECK_FUNCS(getauxval).
* config.in: Re-generated.
* configure: Re-generated.
* nat/ppc-linux.h [__powerpc64__] (ppc64_64bit_inferior_p):
Declare.
* nat/ppc-linux.c: New file.
* ppc-linux-nat.c (ppc_linux_target_wordsize) [__powerpc64__]:
Call ppc64_64bit_inferior_p.
gdb/gdbserver:
2015-01-14 Yao Qi <yao@codesourcery.com>
* Makefile.in (SFILES): Add nat/ppc-linux.c.
(ppc-linux.o): New rule.
* configure.srv (powerpc*-*-linux*): Add ppc-linux.o.
* configure.ac: AC_CHECK_FUNCS(getauxval).
* config.in: Re-generated.
* configure: Re-generated.
* linux-ppc-low.c (ppc_arch_setup) [__powerpc64__]: Call
ppc64_64bit_inferior_p
When I use PPC_FEATURE_BOOKE in GDBserver, I find it is defined in GDB
but not in GDBserver. After taking a further look, I find some macros
are duplicated between ppc-linux-nat.c and linux-ppc-low.c, so this
patch is to move them into nat/ppc-linux.h.
gdb/gdbserver:
2015-01-14 Yao Qi <yao@codesourcery.com>
* linux-ppc-low.c: Include "nat/ppc-linux.h".
(PPC_FEATURE_HAS_VSX): Move to nat/ppc-linux.h.
(PPC_FEATURE_HAS_ALTIVEC, PPC_FEATURE_HAS_SPE): Likewise.
(PT_ORIG_R3, PT_TRAP): Likewise.
(PTRACE_GETVSXREGS, PTRACE_SETVSXREGS): Likewise.
(PTRACE_GETVRREGS, PTRACE_SETVRREGS): Likewise.
(PTRACE_GETEVRREGS, PTRACE_SETEVRREGS): Likewise.
gdb:
2015-01-14 Yao Qi <yao@codesourcery.com>
* ppc-linux-nat.c (PT_ORIG_R3, PT_TRAP): Move to
nat/ppc-linux.h.
(PPC_FEATURE_CELL, PPC_FEATURE_BOOKE): Likewise.
(PPC_FEATURE_HAS_DFP): Likewise.
(PTRACE_GETVRREGS, PTRACE_SETVRREGS): Likewise.
(PTRACE_GETVSXREGS, PTRACE_SETVSXREGS): Likewise.
(PTRACE_GETEVRREGS, PTRACE_SETEVRREGS): Likewise.
Include "nat/ppc-linux.h".
* nat/ppc-linux.h: New file.
* Makefile.in (HFILES_NO_SRCDIR): Add nat/ppc-linux.h.
... instead of relying on libthread_db.
I wrote a test that attaches to a program that constantly spawns
short-lived threads, which exposed several issues. This is one of
them.
On Linux, we need to attach to all threads of a process (thread group)
individually. We currently rely on libthread_db to list the threads,
but that is problematic, because libthread_db relies on reading data
structures out of the inferior (which may well be corrupted). If
threads are being created or exiting just while we try to attach, we
may trip on inconsistencies in the inferior's thread list. To work
around that, when we see a seemingly corrupt list, we currently retry
a few times:
static void
thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new)
{
...
if (until_no_new)
{
/* Require 4 successive iterations which do not find any new threads.
The 4 is a heuristic: there is an inherent race here, and I have
seen that 2 iterations in a row are not always sufficient to
"capture" all threads. */
...
That heuristic may well fail, and when it does, we end up with threads
in the program that aren't under GDB's control. That's obviously bad
and results in quite mistifying failures, like e.g., the process dying
for seeminly no reason when a thread that wasn't attached trips on a
breakpoint.
There's really no reason to rely on libthread_db for this nowadays
when we have /proc mounted. In that case, which is the usual case, we
can list the LWPs from /proc/PID/task/. In fact, GDBserver is already
doing this. The patch factors out that code that knows to walk the
task/ directory out of GDBserver, and makes GDB use it too.
Like GDBserver, the patch makes GDB attach to LWPs and _not_ wait for
them to stop immediately. Instead, we just tag the LWP as having an
expected stop. Because we can only set the ptrace options when the
thread stops, we need a new flag in the lwp structure to keep track of
whether we've already set the ptrace options, just like in GDBserver.
Note that nothing issues any ptrace command to the threads between the
PTRACE_ATTACH and the stop, so this is safe (unlike one scenario
described in gdbserver's linux-low.c).
When we attach to a program that has threads exiting while we attach,
it's easy to race with a thread just exiting as we try to attach to
it, like:
#1 - get current list of threads
#2 - attach to each listed thread
#3 - ooops, attach failed, thread is already gone
As this is pretty normal, we shouldn't be issuing a scary warning in
step #3.
When #3 happens, PTRACE_ATTACH usually fails with ESRCH, but sometimes
we'll see EPERM as well. That happens when the kernel still has the
thread in its task list, but the thread is marked as dead.
Unfortunately, EPERM is ambiguous and we'll get it also on other
scenarios where the thread isn't dead, and in those cases, it's useful
to get a warning. To distiguish the cases, when we get an EPERM
failure, we open /proc/PID/status, and check the thread's state -- if
the /proc file no longer exists, or the state is "Z (Zombie)" or "X
(Dead)", we ignore the EPERM error silently; otherwise, we'll warn.
Unfortunately, there seems to be a kernel race here. Sometimes I get
EPERM, and then the /proc state still indicates "R (Running)"... If
we wait a bit and retry, we do end up seeing X or Z state, or get an
ESRCH. I thought of making GDB retry the attach a few times, but even
with a 500ms wait and 4 retries, I still see the warning sometimes. I
haven't been able to identify the kernel path that causes this yet,
but in any case, it looks like a kernel bug to me. As this just
results failure to suppress a warning that we've been printing since
about forever anyway, I'm just making the test cope with it, and issue
an XFAIL.
gdb/gdbserver/
2015-01-09 Pedro Alves <palves@redhat.com>
* linux-low.c (linux_attach_fail_reason_string): Move to
nat/linux-ptrace.c, and rename.
(linux_attach_lwp): Update comment.
(attach_proc_task_lwp_callback): New function.
(linux_attach): Adjust to rename and use
linux_proc_attach_tgid_threads.
(linux_attach_fail_reason_string): Delete declaration.
gdb/
2015-01-09 Pedro Alves <palves@redhat.com>
* linux-nat.c (attach_proc_task_lwp_callback): New function.
(linux_nat_attach): Use linux_proc_attach_tgid_threads.
(wait_lwp, linux_nat_filter_event): If not set yet, set the lwp's
ptrace option flags.
* linux-nat.h (struct lwp_info) <must_set_ptrace_flags>: New
field.
* nat/linux-procfs.c: Include <dirent.h>.
(linux_proc_get_int): New parameter "warn". Handle it.
(linux_proc_get_tgid): Adjust.
(linux_proc_get_tracerpid): Rename to ...
(linux_proc_get_tracerpid_nowarn): ... this.
(linux_proc_pid_get_state): New function, factored out from
(linux_proc_pid_has_state): ... this. Add new parameter "warn"
and handle it.
(linux_proc_pid_is_gone): New function.
(linux_proc_pid_is_stopped): Adjust.
(linux_proc_pid_is_zombie_maybe_warn)
(linux_proc_pid_is_zombie_nowarn): New functions.
(linux_proc_pid_is_zombie): Use
linux_proc_pid_is_zombie_maybe_warn.
(linux_proc_attach_tgid_threads): New function.
* nat/linux-procfs.h (linux_proc_get_tgid): Update comment.
(linux_proc_get_tracerpid): Rename to ...
(linux_proc_get_tracerpid_nowarn): ... this, and update comment.
(linux_proc_pid_is_gone): New declaration.
(linux_proc_pid_is_zombie): Update comment.
(linux_proc_pid_is_zombie_nowarn): New declaration.
(linux_proc_attach_lwp_func): New typedef.
(linux_proc_attach_tgid_threads): New declaration.
* nat/linux-ptrace.c (linux_ptrace_attach_fail_reason): Adjust to
use nowarn functions.
(linux_ptrace_attach_fail_reason_string): Move here from
gdbserver/linux-low.c and rename.
(ptrace_supports_feature): If the current ptrace options are not
known yet, check them now, instead of asserting.
* nat/linux-ptrace.h (linux_ptrace_attach_fail_reason_string):
Declare.
This patch enhances GDB on GNU/Linux systems in the situation where
we are debugging an inferior that was created from GDB (as opposed
to attached to), by asking the kernel to kill the inferior if GDB
terminates without doing it itself.
This would typically happen when GDB encounters a problem and
crashes, or when it gets killed by an external process. This can
be observed by starting a program under GDB, and then killing
GDB with signal 9. After GDB is killed, the inferior still remains.
This patch also fixes GDBserver similarly.
This fix is conditional on the kernel supporting the PTRACE_O_EXITKILL
feature. On older kernels, the behavior remains unchanged.
gdb/ChangeLog:
* nat/linux-ptrace.h (PTRACE_O_EXITKILL): Define if not
already defined.
(linux_enable_event_reporting): Add parameter "attached".
* nat/linux-ptrace.c (linux_test_for_exitkill): New forward
declaration. New function.
(linux_check_ptrace_features): Add linux_test_for_exitkill call.
(linux_enable_event_reporting): Add new parameter "attached".
Do not call ptrace with the PTRACE_O_EXITKILL if ATTACHED is
nonzero.
* linux-nat.c (linux_init_ptrace): Add parameter "attached".
Use it. Update function description.
(linux_child_post_attach, linux_child_post_startup_inferior):
Update call to linux_enable_event_reporting.
gdb/gdbserver/ChangeLog:
* linux-low.c (linux_low_filter_event): Update call to
linux_enable_event_reporting following the addition of
a new parameter to that function.
Tested on x86_64-linux, native and native-gdbserver.
I also verified by hand that the inferior gets killed when killing
GDB in the "run" case, while the inferior remains in the "attach"
case. Same for GDBserver.
Linux supports multiple "PID namespaces". Processes in different PID
namespaces have different views of the system process list. Sometimes,
a single process can appear in more than one PID namespace, but with a
different PID in each. When GDB and its target are in different PID
namespaces, various features can break due to the mismatch between
what the target believes its PID to be and what GDB believes its PID
to be. The most visible broken functionality is thread enumeration
silently failing.
This patch explicitly warns users against trying to debug across PID
namespaces.
The patch introduced no new failures in my test suite run on an x86_64
installation of Ubuntu 14.10. It doesn't include a test: writing an
automated test that exercises this code would be very involved because
CLONE_NEWNS requires CAP_SYS_ADMIN; the easier way to reproduce the
problem is to start a new lxc container.
gdb/
2014-11-11 Daniel Colascione <dancol@dancol.org>
Warn about cross-PID-namespace debugging.
* nat/linux-procfs.h (linux_proc_pid_get_ns): New prototype.
* nat/linux-procfs.c (linux_proc_pid_get_ns): New function.
* linux-thread-db.c (check_pid_namespace_match): New function.
(thread_db_inferior_created): Call it.
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 commit makes linux-waitpid.c include common-defs.h. GDB's
inclusion of defs.h is removed, but gdbserver's inclusion of
server.h remains to support some gdbserver-specific debug code
that cannot presently be merged. A new FIXME documents this.
gdb/ChangeLog:
* nat/linux-waitpid.c: Include common-defs.h.
[GDBSERVER]: Add FIXME comment.
[!GDBSERVER]: Don't include defs.h or signal.h.
(linux_debug) [!GDBSERVER]: Remove empty block.
This commit makes nat/x86-dregs.c include common-defs.h rather than
defs.h or server.h. An extra header required including in order to
support this change.
gdb/ChangeLog:
* nat/x86-dregs.c: Include common-defs.h and break-common.h.
Don't include defs.h or server.h.
This commit makes nat/linux-btrace.c include common-defs.h rather
than defs.h or server.h. A couple of minor changes were required
to support this change.
gdb/ChangeLog:
* nat/linux-btrace.c: Include common-defs.h.
Don't include defs.h, server.h or gdbthread.h.
* nat/linux-btrace.h (struct target_ops): New forward declaration.
This commit makes 19 of the 22 shared .c files in common, nat and
target include common-defs.h instead of defs.h/server.h. The
remaining three files need slight extra work and are dealt with
in separate commits.
gdb/ChangeLog:
* common/agent.c: Include common-defs.h.
Don't include defs.h or server.h.
* common/buffer.c: Likewise.
* common/common-debug.c: Likewise.
* common/common-utils.c: Likewise.
* common/errors.c: Likewise.
* common/filestuff.c: Likewise.
* common/format.c: Likewise.
* common/gdb_vecs.c: Likewise.
* common/print-utils.c: Likewise.
* common/ptid.c: Likewise.
* common/rsp-low.c: Likewise.
* common/signals.c: Likewise.
* common/vec.c: Likewise.
* common/xml-utils.c: Likewise.
* nat/linux-osdata.c: Likewise.
* nat/linux-procfs.c: Likewise.
* nat/linux-ptrace.c: Likewise.
* nat/mips-linux-watch.c: Likewise.
* target/waitstatus.c: Likewise.
This introduces common-regcache.h. This contains two functions that
allow nat/linux-btrace.c to be simplified. A better long term
solution would be unify the regcache code, but this is sufficient for
now.
gdb/ChangeLog:
* common/common-regcache.h: New file.
* Makefile.in (HFILES_NO_SRCDIR): Add common/common-regcache.h.
* regcache.h: Include common-regcache.h.
(regcache_read_pc): Don't declare.
* regcache.c (get_thread_regcache_for_ptid): New function.
* nat/linux-btrace.c: Don't include regcache.h.
Include common-regcache.h.
(perf_event_read_bts): Use get_thread_regcache_for_ptid.
gdb/gdbserver/ChangeLog:
* regcache.h: Include common-regcache.h.
(regcache_read_pc): Don't declare.
* regcache.c (get_thread_regcache_for_ptid): New function.
This commit adds a new global flag show_debug_regs to common-debug.h
to replace the flag debug_hw_points used by gdbserver and by the
Linux x86 and AArch64 ports, and to replace the flag maint_show_dr
used by the Linux MIPS port.
Note that some debug printing in the AArch64 port was enabled only if
debug_hw_points > 1 but no way to set debug_hw_points to values other
than 0 and 1 was provided; that code was effectively dead. This
commit enables all debug printing if show_debug_regs is nonzero, so
the AArch64 output will be more verbose than previously.
gdb/ChangeLog:
* common/common-debug.h (show_debug_regs): Declare.
* common/common-debug.c (show_debug_regs): Define.
* aarch64-linux-nat.c (debug_hw_points): Don't define. Replace
all uses with show_debug_regs. Replace all uses that considered
debug_hw_points as a multi-value integer with straight boolean
uses.
* x86-nat.c (debug_hw_points): Don't define. Replace all uses
with show_debug_regs.
* nat/x86-dregs.c (debug_hw_points): Don't declare. Replace
all uses with show_debug_regs.
* mips-linux-nat.c (maint_show_dr): Don't define. Replace all
uses with show_debug_regs.
gdb/gdbserver/ChangeLog:
* server.h (debug_hw_points): Don't declare.
* server.c (debug_hw_points): Don't define. Replace all uses
with show_debug_regs.
* linux-aarch64-low.c (debug_hw_points): Don't define. Replace
all uses with show_debug_regs.
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 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 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 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.
All source files under gdb/ that include headers from gdb/ include
either defs.h or server.h before any other code with the exception
of gdb/gdbserver/gdbreplay.c which seems to be a special case. Both
defs.h and server.h include both our and gnulib's config.h files as
their first non-comment line, so no other file ever needs to directly
include any config.h. This commit removes two such direct config.h
includes.
gdb/
2014-07-30 Gary Benson <gbenson@redhat.com>
* common/common-utils.h: Do not include config.h.
* nat/linux-btrace.h: Likewise.
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.
This patch removes some GDBSERVER checks from nat/linux-ptrace.c.
Currently the code uses a compile-time check to decide whether some
flags should be used. This changes the code to instead let users of
the module specify an additional set of flags; and then changes gdb's
linux-nat.c to call this function. At some later date, when the back
ends are fully merged, we will be able to remove this function again.
gdb/
2014-07-24 Tom Tromey <tromey@redhat.com>
Gary Benson <gbenson@redhat.com>
* nat/linux-ptrace.c (additional_flags): New global.
(linux_test_for_tracesysgood, linux_test_for_tracefork): Use
additional_flags; don't check GDBSERVER.
(linux_ptrace_set_additional_flags): New function.
* nat/linux-ptrace.h (linux_ptrace_set_additional_flags):
Declare.
* linux-nat.c (_initialize_linux_nat): Call
linux_ptrace_set_additional_flags.
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 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.
Just a small optimization. No need to block/unblock signals if we're
not going to call sigsuspend.
gdb/
2014-02-27 Pedro Alves <palves@redhat.com>
* nat/linux-waitpid.c (my_waitpid): Only block signals if WNOHANG
isn't set.
So that gdbserver's Linux backend can use it too.
gdb/
2014-02-27 Pedro Alves <palves@redhat.com>
PR 12702
* linux-nat.c (status_to_str): Moved to nat/linux-waitpid.c.
* nat/linux-waitpid.c: Include string.h.
(status_to_str): Moved here and made extern.
* nat/linux-waitpid.h (status_to_str): New declaration.
Joel Brobecker
Sergio Durigan Junior
Yao Qi
Pedro Alves
Daniel Colascione
Don Breazeal
Gary Benson
Tom Tromey
Doug Evans
Luis Machado