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2021-05-08gdb, gdbserver: make status_to_str return std::stringSimon Marchi2-1/+6
Instead of using a static buffer. This is safer, and we don't really mind about any extra dynamic allocation here, since it's only used for debug purposes. gdb/ChangeLog: * nat/linux-waitpid.c (status_to_str): Return std::string. * nat/linux-waitpid.h (status_to_str): Likewise. * linux-nat.c (linux_nat_post_attach_wait): Adjust. (linux_nat_target::attach): Adjust. (linux_handle_extended_wait): Adjust. (wait_lwp): Adjust. (stop_wait_callback): Adjust. (linux_nat_filter_event): Adjust. (linux_nat_wait_1): Adjust. * nat/linux-waitpid.c (status_to_str): Adjust. * nat/linux-waitpid.h (status_to_str): Adjust. gdbserver/ChangeLog: * linux-low.cc (linux_process_target::wait_for_event_filtered): Adjust to status_to_str returning std::string. Change-Id: Ia8aead70270438a5690f243e6faafff6c38ff757
2021-05-08Don't run personality syscall at configure time; don't check it at allPedro Alves4-85/+7
Currently, in order to tell whether support for disabling address space randomization on Linux is available, GDB checks if the personality syscall works, at configure time. I.e., it does a run test, instead of a compile/link test: AC_RUN_IFELSE([PERSONALITY_TEST], [have_personality=true], [have_personality=false], This is a bit bogus, because the machine the build is done on may not (and is when you consider distro gdbs) be the machine that eventually runs gdb. It would be better if this were a compile/link test instead, and then at runtime, GDB coped with the personality syscall failing. Actually, GDB already copes. One environment where this is problematic is building GDB in a Docker container -- by default, Docker runs the container with seccomp, with a profile that disables the personality syscall. You can tell Docker to use a less restricted seccomp profile, but I think we should just fix it in GDB. "man 2 personality" says: This system call first appeared in Linux 1.1.20 (and thus first in a stable kernel release with Linux 1.2.0); library support was added in glibc 2.3. ... ADDR_NO_RANDOMIZE (since Linux 2.6.12) With this flag set, disable address-space-layout randomization. glibc 2.3 was released in 2002. Linux 2.6.12 was released in 2005. The original patch that added the configure checks was submitted in 2008. The first version of the patch that was submitted to the list called personality from common code: https://sourceware.org/pipermail/gdb-patches/2008-June/058204.html and then was moved to Linux-specific code: https://sourceware.org/pipermail/gdb-patches/2008-June/058209.html Since HAVE_PERSONALITY is only checked in Linux code, and ADDR_NO_RANDOMIZE exists for over 15 years, I propose just completely removing the configure checks. If for some odd reason, some remotely modern system still needs a configure check, then we can revert this commit but drop the AC_RUN_IFELSE in favor of always doing the AC_LINK_IFELSE cross-compile fallback. gdb/ChangeLog: * linux-nat.c (linux_nat_target::supports_disable_randomization): Remove references to HAVE_PERSONALITY. * nat/linux-personality.c: Remove references to HAVE_PERSONALITY. (maybe_disable_address_space_randomization) (~maybe_disable_address_space_randomizatio): Remove references to HAVE_PERSONALITY. * config.in, configure: Regenerate. gdbserver/ChangeLog: * linux-low.cc: (linux_process_target::supports_disable_randomization): Remove reference to HAVE_PERSONALITY. * config.in, configure: Regenerate. gdbsupport/ChangeLog: * common.m4 (personality test): Remove.
2021-05-08Don't include sys/personality.h in linux-low.cc anymorePedro Alves2-7/+5
Lancelot pointed out that since the refactor at: https://sourceware.org/pipermail/gdb-patches/2015-January/120503.html the sys/personality.h include is not needed in linux-low.cc anymore, as it does not call personality directly itself anymore. gdbserver/ChangeLog: * linux-low.cc: Don't include sys/personality.h or define ADDR_NO_RANDOMIZE.
2021-05-06gdbserver/server: make some functions voidTankut Baris Aktemur2-24/+16
The 'handle_v_attach', 'handle_v_run', and 'handle_v_kill' functions' return values are unused. They indicate error/success result by putting packets. Make the functions void. Tested by rebuilding. gdbserver/ChangeLog: 2021-05-06 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com> * server.cc (handle_v_attach) (handle_v_run) (handle_v_kill): Make void.
2021-05-03Fix x86_64 mingw buildTom Tromey2-1/+7
PR build/27807 points out that my recent changes to the Windows port missed a spot in win32-i386-low.cc -- a call to win32_Wow64GetThreadContext remained, causing link errors in gdbserver. This happened because I tested an i686 build, but this code is only used on an x86_64 build. This patch fixes the bug. I am checking it in. gdbserver/ChangeLog 2021-05-03 Tom Tromey <tromey@adacore.com> PR build/27807: * win32-i386-low.cc (i386_get_thread_context): Call Wow64GetThreadContext, not win32_Wow64GetThreadContext.
2021-04-30Share DLL code between gdb and gdbserverTom Tromey2-162/+17
This moves the new DLL-loading code into nat/windows-nat.c, and changes both gdb and gdbserver to use the shared code. One client-provided callback, handle_load_dll, is changed to allow the code to be shared. This callback was actually never called from nat/windows-nat.c; maybe I had planned to share more here and then didn't finish... I'm not sure. gdb/ChangeLog 2021-04-30 Tom Tromey <tromey@adacore.com> * windows-nat.c (windows_nat::handle_load_dll): Update. (windows_nat_target::get_windows_debug_event): Call dll_loaded_event. (windows_add_all_dlls, windows_add_dll): Move to nat/windows-nat.c. * nat/windows-nat.h (handle_load_dll): Change parameters. (dll_loaded_event, windows_add_all_dlls): Declare. * nat/windows-nat.c (windows_add_dll, windows_add_all_dlls): Move from windows-nat.c. (dll_loaded_event): New function. gdbserver/ChangeLog 2021-04-30 Tom Tromey <tromey@adacore.com> * win32-low.cc (do_initial_child_stuff): Update. (windows_nat::handle_load_dll): Rename from win32_add_one_solib. Change parameter type. (win32_add_dll, win32_add_all_dlls) (windows_nat::handle_load_dll): Remove. (get_child_debug_event): Call dll_loaded_event.
2021-04-30Use nat/windows-nat function indirection codeTom Tromey2-142/+58
This changes gdbserver to use the function indirection code that was just moved into nat/windows-nat.[ch]. One additional function is used by gdbserver that was not used by gdb. gdb/ChangeLog 2021-04-30 Tom Tromey <tromey@adacore.com> * nat/windows-nat.h (GenerateConsoleCtrlEvent): New define. (GenerateConsoleCtrlEvent_ftype, GenerateConsoleCtrlEvent): Declare. * nat/windows-nat.c (GenerateConsoleCtrlEvent): Define. (initialize_loadable): Initialize GenerateConsoleCtrlEvent. gdbserver/ChangeLog 2021-04-30 Tom Tromey <tromey@adacore.com> * win32-low.cc (GETPROCADDRESS): Remove. (winapi_DebugActiveProcessStop, winapi_DebugSetProcessKillOnExit) (winapi_DebugBreakProcess, winapi_GenerateConsoleCtrlEvent) (winapi_Wow64SetThreadContext, win32_Wow64GetThreadContext) (win32_Wow64SetThreadContext): Remove. (win32_set_thread_context, do_initial_child_stuff) (win32_process_target::attach, win32_process_target::detach): Update. (winapi_EnumProcessModules, winapi_EnumProcessModulesEx) (winapi_GetModuleInformation, winapi_GetModuleInformationA): Remove. (win32_EnumProcessModules, win32_EnumProcessModulesEx) (win32_GetModuleInformation, win32_GetModuleInformationA): Remove. (load_psapi): Remove. (win32_add_dll, win32_process_target::request_interrupt): Update. (initialize_low): Call initialize_loadable.
2021-04-14Remove use of _WIN32_WCETom Tromey2-2/+5
This removes the one last use of _WIN32_WCE from gdbserver. gdbserver/ChangeLog 2021-04-14 Tom Tromey <tromey@adacore.com> * win32-low.cc (windows_nat::handle_load_dll): Don't check _WIN32_WCE.
2021-04-13Remove WinCE code from gdbreplayPedro Alves2-51/+4
gdbserver/ChangeLog: * gdbreplay.c [__MINGW32CE__] (COUNTOF, errno, strerror): Remove.
2021-04-13Remove some unused typedefs from gdbserverTom Tromey2-4/+5
I noticed that gdbserver/win32-low.cc has a few typedefs that are not used. This patch removes them. gdbserver/ChangeLog 2021-04-13 Tom Tromey <tromey@adacore.com> * win32-low.cc (winapi_CreateToolhelp32Snapshot) (winapi_Module32First, winapi_Module32Next): Remove typedefs.
2021-04-13Remove process_stratum_target::hostio_last_error abstractionPedro Alves10-61/+22
Now that the WinCE port is gone, all ports map host I/O errors from errno, so this abstraction is no longer necessary. Basically undoes: https://sourceware.org/pipermail/gdb-patches/2008-January/055511.html https://sourceware.org/pipermail/gdb-patches/attachments/20080131/f44e7012/attachment.bin gdbserver/ChangeLog: * Makefile.in (SFILES): Remove hostio-errno.cc. * configure: Regenerate. * configure.ac (GDBSERVER_DEPFILES): No longer add $srv_hostio_err_objs. * configure.srv (srv_hostio_err_objs): Delete. * hostio-errno.cc: Delete. * hostio.cc (hostio_error): Inline hostio_last_error_from_errno here. * hostio.h (hostio_last_error_from_errno): Delete. * target.cc (process_stratum_target::hostio_last_error): Delete. * target.h (class process_stratum_target) <hostio_last_error>: Delete.
2021-04-12gdb, gdbserver: remove WinCE support codeSimon Marchi3-175/+10
The support for WinCE was removed with commit 84b300de3666 ("gdbserver: remove support for ARM/WinCE"). There is some leftover code for WinCE support, guarded by the _WIN32_WCE macro, which I didn't know of at the time. I didn't remove the _WIN32_WCE references in the tests, because in theory we still support the WinCE architecture in GDB (when debugging remotely). So someone could run a test with that (although I'd be really surprised). gdb/ChangeLog: * nat/windows-nat.c: Remove all code guarded by _WIN32_WCE. * nat/windows-nat.h: Likewise. gdbserver/ChangeLog: * win32-low.cc: Remove all code guarded by _WIN32_WCE. * win32-low.h: Likewise. Change-Id: I7a871b897e2135dc195b10690bff2a01d9fac05a
2021-04-12gdbserver: constify the 'pid_to_exec_file' target opTankut Baris Aktemur8-9/+19
gdbserver/ChangeLog: 2021-04-12 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com> * target.h (class process_stratum_target) <pid_to_exec_file>: Constify the return type. Update the definition/references below. * target.cc (process_stratum_target::pid_to_exec_file) * linux-low.h (class linux_process_target) <pid_to_exec_file> * linux-low.cc (linux_process_target::pid_to_exec_file) * netbsd-low.h (class netbsd_process_target) <pid_to_exec_file> * netbsd-low.cc (netbsd_process_target::pid_to_exec_file) * server.cc (handle_qxfer_exec_file)
2021-04-11Improve support for loading DLLs at run time in gdbserver.Eli Zaretskii2-12/+52
This fixes win32-low.cc in the same way as a recent change in windows-nat.c did for GDB: if the lpImageName member of the load-DLL debug event doesn't allow us to find the file name of the DLL, then loop over all the DLLs mapped into the inferior to find the one loaded at the same base address as given by the lpBaseOfDll member of the debug event. gdbserver/ChangeLog: 2021-04-11 Eli Zaretskii <eliz@gnu.org> * win32-low.cc (win32_add_dll): New function, with body almost identical to what win32_add_all_dlls did. Accepts one argument; if that is non-NULL, returns the file name of the DLL that is loaded at the base address equal to that argument, or NULL if not found. If the argument is NULL, add all the DLLs loaded by the inferior to the list of solibs and return NULL. (win32_add_all_dlls): Now a thin wrapper around win32_add_dll. (windows_nat::handle_load_dll) [!_WIN32_WCE]: If get_image_name failed to glean the file name of the DLL, call win32_add_dll to try harder using the lpBaseOfDll member of the load-DLL event.
2021-03-30Fix inverted logic bugLuis Machado2-5/+10
During reviews, I changed the success/failure variables from int to bool, but missed updating the code in a couple spots. Given the logic inversion, the gdbserver code fails instead of succeeding. Fixed with the following patch. Seems fairly obvious, so I'll push it soon. gdbserver/ChangeLog: 2021-03-30 Luis Machado <luis.machado@linaro.org> * server.cc (handle_general_set, handle_query): Update variable to bool and fix verification logic.
2021-03-24AArch64: Add gdbserver MTE supportLuis Machado4-0/+76
Adds the AArch64-specific memory tagging support (MTE) by implementing the required hooks and checks for GDBserver. gdbserver/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * Makefile.in (SFILES): Add /../gdb/nat/aarch64-mte-linux-ptrace.c. * configure.srv (aarch64*-*-linux*): Add arch/aarch64-mte-linux.o and nat/aarch64-mte-linux-ptrace.o. * linux-aarch64-low.cc: Include nat/aarch64-mte-linux-ptrace.h. (class aarch64_target) <supports_memory_tagging> <fetch_memtags, store_memtags>: New method overrides. (aarch64_target::supports_memory_tagging) (aarch64_target::fetch_memtags) (aarch64_target::store_memtags): New methods.
2021-03-24AArch64: Add MTE register set support for GDB and gdbserverLuis Machado2-0/+36
AArch64 MTE support in the Linux kernel exposes a new register through ptrace. This patch adds the required code to support it. include/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * elf/common.h (NT_ARM_TAGGED_ADDR_CTRL): Define. gdb/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * aarch64-linux-nat.c (fetch_mteregs_from_thread): New function. (store_mteregs_to_thread): New function. (aarch64_linux_nat_target::fetch_registers): Update to call fetch_mteregs_from_thread. (aarch64_linux_nat_target::store_registers): Update to call store_mteregs_to_thread. * aarch64-tdep.c (aarch64_mte_register_names): New struct. (aarch64_cannot_store_register): Handle MTE registers. (aarch64_gdbarch_init): Initialize and setup MTE registers. * aarch64-tdep.h (gdbarch_tdep) <mte_reg_base>: New field. <has_mte>: New method. * arch/aarch64-linux.h (AARCH64_LINUX_SIZEOF_MTE): Define. gdbserver/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * linux-aarch64-low.cc (aarch64_fill_mteregset): New function. (aarch64_store_mteregset): New function. (aarch64_regsets): Add MTE register set entry. (aarch64_sve_regsets): Add MTE register set entry.
2021-03-24AArch64: Add target description/feature for MTE registersLuis Machado5-11/+30
This patch adds a target description and feature "mte" for aarch64. It includes one new register, tag_ctl, that can be used to configure the tag generation rules and sync/async modes. It is 64-bit in size. The patch also adjusts the code that creates the target descriptions at runtime based on CPU feature checks. gdb/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * aarch64-linux-nat.c (aarch64_linux_nat_target::read_description): Take MTE flag into account. Slight refactor to hwcap flag checking. * aarch64-linux-tdep.c (aarch64_linux_core_read_description): Likewise. * aarch64-tdep.c (tdesc_aarch64_list): Add one more dimension for MTE. (aarch64_read_description): Add mte_p parameter and update to use it. Update the documentation. (aarch64_gdbarch_init): Update call to aarch64_read_description. * aarch64-tdep.h (aarch64_read_description): Add mte_p parameter. * arch/aarch64.c: Include ../features/aarch64-mte.c. (aarch64_create_target_description): Add mte_p parameter and update the code to use it. * arch/aarch64.h (aarch64_create_target_description): Add mte_p parameter. * features/Makefile (FEATURE_XMLFILES): Add aarch64-mte.xml. * features/aarch64-mte.c: New file, generated. * features/aarch64-mte.xml: New file. gdbserver/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * linux-aarch64-ipa.cc (get_ipa_tdesc): Update call to aarch64_linux_read_description. (initialize_low_tracepoint): Likewise. * linux-aarch64-low.cc (aarch64_target::low_arch_setup): Take MTE flag into account. * linux-aarch64-tdesc.cc (tdesc_aarch64_list): Add one more dimension for MTE. (aarch64_linux_read_description): Add mte_p parameter and update to use it. * linux-aarch64-tdesc.h (aarch64_linux_read_description): Add mte_p parameter.
2021-03-24AArch64: Add MTE CPU feature check supportLuis Machado2-0/+5
This patch is a preparation for the next patches implementing MTE. It just adds a HWCAP2 constant for MTE, creates a new generic arch/aarch64-mte-linux.h file and includes that file in the source files that will use it. gdb/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * Makefile.in (HFILES_NO_SRCDIR): Add arch/aarch64-mte-linux.h. * aarch64-linux-nat.c: Include arch/aarch64-mte-linux.h. * aarch64-linux-tdep.c: Likewise * arch/aarch64-mte-linux.h: New file. gdbserver/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * linux-aarch64-low.cc: Include arch/aarch64-mte-linux.h.
2021-03-24Unit tests for gdbserver memory tagging remote packetsLuis Machado2-0/+83
Add some unit testing to exercise the functions handling the qMemTags and QMemTags packets as well as feature support. gdbserver/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * server.cc (test_memory_tagging_functions): New function. (captured_main): Register test_memory_tagging_functions.
2021-03-24GDBserver remote packet support for memory taggingLuis Machado7-25/+240
This patch adds the generic remote bits to gdbserver so it can check for memory tagging support and handle fetch tags and store tags requests. gdbserver/ChangeLog: 2021-03-24 Luis Machado <luis.machado@linaro.org> * remote-utils.cc (decode_m_packet_params): Renamed from ... (decode_m_packet): ... this, which now calls decode_m_packet_params. Make char * param/return const char *. (decode_M_packet): Use decode_m_packet_params and make char * param const char *. * remote-utils.h (decode_m_packet_params): New prototype. (decode_m_packet): Constify char pointers. (decode_M_packet): Likewise. * server.cc (create_fetch_memtags_reply) (parse_store_memtags_request): New functions. (handle_general_set): Handle the QMemTags packet. (parse_fetch_memtags_request): New function. (handle_query): Handle the qMemTags packet and advertise memory tagging support. (captured_main): Initialize memory tagging flag. * server.h (struct client_state): Initialize memory tagging flag. * target.cc (process_stratum_target::supports_memory_tagging) (process_stratum_target::fetch_memtags) (process_stratum_target::store_memtags): New methods. * target.h: Include gdbsupport/byte-vector.h. (class process_stratum_target) <supports_memory_tagging> <fetch_memtags, store_memtags>: New class virtual methods. (target_supports_memory_tagging): Define.
2021-03-22gdbserver: convert the global dll list into a process_info fieldTankut Baris Aktemur6-20/+70
The 'all_dlls' list is global. This would cause the complete dll list to be reported for individual processes. Move the list into the process_info struct. Currently the dll list is used only by the win32-low target, which does not support the multi-process feature. Therefore, it practically does not matter whether the list is global or per-process. However, there may be targets that are outside the binutils-gdb repo (e.g. we, at Intel, have such a target) that have multi-process and use the dll list. So, it makes sense to do the right thing. gdbserver/ChangeLog: 2021-03-22 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com> * inferiors.h (struct process_info) <all_dlls, dlls_changed>: New fields. * dll.h (loaded_dll) (unloaded_dll): Declare an overloaded version that takes a proc parameter. * dll.cc (loaded_dll) (unloaded_dll): Implement the overloaded versions. (clear_dlls): Clear all process' dll lists. (all_dlls, dlls_changed): Remove the global variables. * remote-utils.cc (prepare_resume_reply): Update to consider a dll list per proc. * server.cc (handle_qxfer_libraries): Ditto. (handle_v_attach): Ditto. (captured_main): Ditto.
2021-02-23gdbserver: linux-low: make linux_process_target::filter_event return voidSimon Marchi3-14/+21
Same as the previous patch, but for GDBserver. The return value of this method is never used, change it to return void. gdbserver/ChangeLog: * linux-low.cc (linux_process_target::filter_event): Return void. * linux-low.h (class linux_process_target) <filter_event>: Return void. Change-Id: I79e5dc04d9b21b9f01c6d675fa463d1b1a703b3a
2021-02-12Add stdio support to gdbreplayTom Tromey2-21/+45
I've been using gdbreplay to help debug an intermittent failure, and I wanted it to be a little simpler to use. This patch adds support for "-" as the "address" argument. With this patch you can do: (gdb) target remote | gdbreplay logfile - ... and not have to start gdbreplay in a separate shell. 2021-02-12 Tom Tromey <tromey@adacore.com> * gdbreplay.cc (remote_desc): Remove. (remote_desc_in, remote_desc_out): New globals. (remote_close): Update. (remote_open): Handle "-". (remote_open): Update. (logchar): Log to stderr. (expect, play): Update.
2021-02-12Minor constification in gdbreplayTom Tromey2-2/+6
I noticed a spot in gdbreplay where "const" could be used. 2021-02-12 Tom Tromey <tromey@adacore.com> * gdbreplay.cc (remote_open): Constify.
2021-02-05gnulib: update to 776af40e0Paul E. Murphy3-1/+12
This fixes PR27184, a failure to compile gdb due to cdefs.h being out of sync with glibc on ppc64le targets which are compiled with -mabi=ieeelongdouble and glibc 2.32. Likewise, update usage of _GL_ATTRIBUTE_FORMAT_PRINTF to _GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD. Likewise, disable newly added rpl_free gnulib api in gdbserver support libraries. Likewise, undefine read/write macros before redefining them on mingw targets. Likewise, wrap C++ usage of free with GNULIB_NAMESPACE namespace as needed. Change-Id: I86517613c0d8ac8f5ea45bbc4ebe2b54a3aef29f
2021-02-03gdbserver: spurious SIGTRAP w/ detach while step-over in progressPedro Alves2-1/+33
A following patch will add a new testcase that has two processes, each with a number of threads constantly tripping a breakpoint and stepping over it, because the breakpoint has a condition that evals false. Then GDB detaches from one of the processes, while both processes are running. And then the testcase sends a SIGUSR1 to the other process. When run against gdbserver, that would occasionaly fail like this: (gdb) PASS: gdb.threads/detach-step-over.exp: iter 1: detach Executing on target: kill -SIGUSR1 208303 (timeout = 300) spawn -ignore SIGHUP kill -SIGUSR1 208303 Thread 2.5 "detach-step-ove" received signal SIGTRAP, Trace/breakpoint trap. [Switching to Thread 208303.208305] 0x000055555555522a in thread_func (arg=0x0) at /home/pedro/gdb/binutils-gdb/src/gdb/testsuite/gdb.threads/detach-step-over.c:54 54 counter++; /* Set breakpoint here. */ What happened was that GDBserver is doing a step-over for process A when a detach request for process B arrives. And that generates a spurious SIGTRAP report for process A, as seen above. The GDBserver logs reveal what happened: - GDB manages to detach while a step over is in progress. That reaches linux_process_target::complete_ongoing_step_over(), which does: /* Passing NULL_PTID as filter indicates we want all events to be left pending. Eventually this returns when there are no unwaited-for children left. */ ret = wait_for_event_filtered (minus_one_ptid, null_ptid, &wstat, __WALL); As the comment say, this leaves all events pending, _including_ the just finished step SIGTRAP. We never discard that SIGTRAP. So GDBserver reports the SIGTRAP to GDB. GDB can't explain the SIGTRAP, so it reports it to the user. The GDBserver log looks like this. The LWP of interest is 208305: Need step over [LWP 208305]? yes, found breakpoint at 0x555555555227 proceed_all_lwps: found thread 208305 needing a step-over Starting step-over on LWP 208305. Stopping all threads 208305 starts a step-over. >>>> entering void linux_process_target::stop_all_lwps(int, lwp_info*) stop_all_lwps (stop-and-suspend, except=LWP 208303.208305) Sending sigstop to lwp 208303 Sending sigstop to lwp 207755 wait_for_sigstop: pulling events LWFE: waitpid(-1, ...) returned 207755, ERRNO-OK LLW: waitpid 207755 received Stopped (signal) (stopped) pc is 0x7f7e045593bf Expected stop. LLW: SIGSTOP caught for LWP 207755.207755 while stopping threads. LWFE: waitpid(-1, ...) returned 208303, ERRNO-OK LLW: waitpid 208303 received Stopped (signal) (stopped) pc is 0x7ffff7e743bf Expected stop. LLW: SIGSTOP caught for LWP 208303.208303 while stopping threads. LWFE: waitpid(-1, ...) returned 0, ERRNO-OK leader_pid=208303, leader_lp!=NULL=1, num_lwps=11, zombie=0 leader_pid=207755, leader_lp!=NULL=1, num_lwps=11, zombie=0 LLW: exit (no unwaited-for LWP) stop_all_lwps done, setting stopping_threads back to !stopping <<<< exiting void linux_process_target::stop_all_lwps(int, lwp_info*) Done stopping all threads for step-over. pc is 0x555555555227 Writing 8b to 0x555555555227 in process 208305 Could not findsigchld_handler fast tracepoint jump at 0x555555555227 in list (uninserting). pending reinsert at 0x555555555227 step from pc 0x555555555227 Resuming lwp 208305 (step, signal 0, stop expected) <<<< exiting ptid_t linux_process_target::wait_1(ptid_t, target_waitstatus*, target_wait_flags) handling possible serial event getpkt ("D;32b8b"); [no ack sent] The detach request arrives. sigchld_handler Tracing is already off, ignoring detach: step over in progress, finish it first GDBserver realizes a step over for 208305 was in progress, let's it finish. LWFE: waitpid(-1, ...) returned 208305, ERRNO-OK LLW: waitpid 208305 received Stopped (signal) (stopped) pc is 0x555555555227 Expected stop. LLW: step LWP 208303.208305, 0, 0 (discard delayed SIGSTOP) pending reinsert at 0x555555555227 step from pc 0x555555555227 Resuming lwp 208305 (step, signal 0, stop not expected) LWFE: waitpid(-1, ...) returned 0, ERRNO-OK leader_pid=208303, leader_lp!=NULL=1, num_lwps=11, zombie=0 leader_pid=207755, leader_lp!=NULL=1, num_lwps=11, zombie=0 sigsuspend'ing LWFE: waitpid(-1, ...) returned 208305, ERRNO-OK LLW: waitpid 208305 received Trace/breakpoint trap (stopped) pc is 0x55555555522a CSBB: LWP 208303.208305 stopped by trace LWFE: waitpid(-1, ...) returned 0, ERRNO-OK leader_pid=208303, leader_lp!=NULL=1, num_lwps=11, zombie=0 leader_pid=207755, leader_lp!=NULL=1, num_lwps=11, zombie=0 LLW: exit (no unwaited-for LWP) Finished step over. The step-over for 208305 finishes. Writing cc to 0x555555555227 in process 208305 Could not find fast tracepoint jump at 0x555555555227 in list (reinserting). >>>> entering void linux_process_target::stop_all_lwps(int, lwp_info*) stop_all_lwps (stop, except=none) wait_for_sigstop: pulling events The detach proceeds (snipped). ... proceed_one_lwp: lwp 208305 LWP 208305 has pending status, leaving stopped Later on, 208305 has a pending status (the step SIGTRAP from the step-over), so GDBserver starts the process of reporting it. ... wait_1 ret = LWP 208303.208305, 1, 5 <<<< exiting ptid_t linux_process_target::wait_1(ptid_t, target_waitstatus*, target_wait_flags) ... and eventually GDB receives the stop notification (T05 == SIGTRAP): getpkt ("vStopped"); [no ack sent] sigchld_handler vStopped: acking 3 Writing resume reply for LWP 208303.208305:1 putpkt ("$T0506:f0ee58f7ff7f0* ;07:f0ee58f7ff7f0* ;10:2a525*"550* ;thread:p32daf.32db1;core:c;#37"); [noack mode] From the GDB side, we see: [infrun] fetch_inferior_event: enter [infrun] fetch_inferior_event: fetch_inferior_event enter [infrun] do_target_wait: Found 2 inferiors, starting at #1 [infrun] print_target_wait_results: target_wait (-1.0.0 [process -1], status) = [infrun] print_target_wait_results: 208303.208305.0 [Thread 208303.208305], [infrun] print_target_wait_results: status->kind = stopped, signal = GDB_SIGNAL_TRAP [infrun] handle_inferior_event: status->kind = stopped, signal = GDB_SIGNAL_TRAP [infrun] start_step_over: enter [infrun] start_step_over: stealing global queue of threads to step, length = 6 [infrun] operator(): putting back 6 threads to step in global queue [infrun] start_step_over: exit [infrun] handle_signal_stop: context switch [infrun] context_switch: Switching context from process 0 to Thread 208303.208305 [infrun] handle_signal_stop: stop_pc=0x55555555522a [infrun] handle_signal_stop: random signal (GDB_SIGNAL_TRAP) [infrun] stop_waiting: stop_waiting [infrun] stop_all_threads: starting The fix is to discard the step SIGTRAP, unless GDB wanted the thread to step. gdbserver/ChangeLog: * linux-low.cc (linux_process_target::complete_ongoing_step_over): Discard step SIGTRAP, unless GDB wanted the thread to step.
2021-02-03Fix a couple vStopped pending ack bugsPedro Alves2-0/+14
A following patch will add a testcase that has two processes with threads stepping over a breakpoint continuously, and then detaches from one of the processes while threads are running. The other process continues stepping over its breakpoint. And then the testcase sends a SIGUSR1, expecting that GDB reports it. That would sometimes hang against gdbserver, due to the bugs fixed here. Both bugs are related, in that they're about remote protocol asynchronous Stop notifications. There's a bug in GDB, and another in GDBserver. The GDB bug: - when we detach from a process, the remote target discards any pending RSP notification related to that process, including the in-flight, yet-unacked notification. Discarding the in-flight notification is the problem. Until the in-flight notification is acked with a vStopped packet, the server won't send another %Stop notification. As a result, the debug session gets messed up. In the new testcase's case, GDB would hang inside stop_all_threads, waiting for a stop for one of the process'es threads, which never arrived -- its stop reply was permanently stuck in the stop reply queue, waiting for a vStopped packet that never arrived. In summary: 1. GDBserver sends stop notification about thread X, the remote target receives it and stores it 2. At the same time, GDB detaches thread X's inferior 3. The remote target discards the received stop notification 4. GDBserver waits forever for the ack The GDBserver bug: GDBserver has the opposite bug. It also discards notifications for the process being detached. If that discards the head of the notification queue, when gdb sends an ack, it ends up acking the _next_ notification. Meaning, gdb loses one notification. In the testcase, this results in a similar hang in stop_all_threads. So we have two very similar bugs in GDB and GDBserver, both resulting in a similar symptom. That's why I'm fixing them both at the same time. gdb/ChangeLog: * remote.c (remote_notif_stop_ack): Don't error out on TARGET_WAITKIND_IGNORE; instead, just ignore the notification. (remote_target::discard_pending_stop_replies): Don't delete in-flight notification; instead, clear its contents. gdbserver/ChangeLog: * server.cc (discard_queued_stop_replies): Don't ever discard the notification at the head of the list.
2021-01-20gdb: make some variables staticSimon Marchi6-15/+27
I'm trying to enable clang's -Wmissing-variable-declarations warning. This patch fixes all the obvious spots where we can simply add "static" (at least, found when building on x86-64 Linux). gdb/ChangeLog: * aarch64-linux-tdep.c (aarch64_linux_record_tdep): Make static. * aarch64-tdep.c (tdesc_aarch64_list, aarch64_prologue_unwind, aarch64_stub_unwind, aarch64_normal_base, ): Make static. * arm-linux-tdep.c (arm_prologue_unwind): Make static. * arm-tdep.c (struct frame_unwind): Make static. * auto-load.c (auto_load_safe_path_vec): Make static. * csky-tdep.c (csky_stub_unwind): Make static. * gdbarch.c (gdbarch_data_registry): Make static. * gnu-v2-abi.c (gnu_v2_abi_ops): Make static. * i386-netbsd-tdep.c (i386nbsd_mc_reg_offset): Make static. * i386-tdep.c (i386_frame_setup_skip_insns, i386_tramp_chain_in_reg_insns, i386_tramp_chain_on_stack_insns): Make static. * infrun.c (observer_mode): Make static. * linux-nat.c (sigchld_action): Make static. * linux-thread-db.c (thread_db_list): Make static. * maint-test-options.c (maintenance_test_options_list): * mep-tdep.c (mep_csr_registers): Make static. * mi/mi-cmds.c (struct mi_cmd_stats): Remove struct type name. (stats): Make static. * nat/linux-osdata.c (struct osdata_type): Make static. * ppc-netbsd-tdep.c (ppcnbsd_reg_offsets): Make static. * progspace.c (last_program_space_num): Make static. * python/py-param.c (struct parm_constant): Remove struct type name. (parm_constants): Make static. * python/py-record-btrace.c (btpy_list_methods): Make static. * python/py-record.c (recpy_gap_type): Make static. * record.c (record_goto_cmdlist): Make static. * regcache.c (regcache_descr_handle): Make static. * registry.h (DEFINE_REGISTRY): Make definition static. * symmisc.c (std_in, std_out, std_err): Make static. * top.c (previous_saved_command_line): Make static. * tracepoint.c (trace_user, trace_notes, trace_stop_notes): Make static. * unittests/command-def-selftests.c (nr_duplicates, nr_invalid_prefixcmd, lists): Make static. * unittests/observable-selftests.c (test_notification): Make static. * unittests/optional/assignment/1.cc (counter): Make static. * unittests/optional/assignment/2.cc (counter): Make static. * unittests/optional/assignment/3.cc (counter): Make static. * unittests/optional/assignment/4.cc (counter): Make static. * unittests/optional/assignment/5.cc (counter): Make static. * unittests/optional/assignment/6.cc (counter): Make static. gdbserver/ChangeLog: * ax.cc (bytecode_address_table): Make static. * debug.cc (debug_file): Make static. * linux-low.cc (stopping_threads): Make static. (step_over_bkpt): Make static. * linux-x86-low.cc (amd64_emit_ops, i386_emit_ops): Make static. * tracepoint.cc (stop_tracing_bkpt, flush_trace_buffer_bkpt, alloced_trace_state_variables, trace_buffer_ctrl, tracing_start_time, tracing_stop_time, tracing_user_name, tracing_notes, tracing_stop_note): Make static. Change-Id: Ic1d8034723b7802502bda23770893be2338ab020
2021-01-20[gdb/server] Don't overwrite fs/gs_base with -m32Tom de Vries2-22/+38
Consider a minimal test-case test.c: ... int main (void) { return 0; } ... compiled with -m32: ... $ gcc test.c -m32 ... When running the exec using gdbserver on openSUSE Factory (currently running a linux kernel version 5.10.5): ... $ gdbserver localhost:12345 a.out ... to which we connect in a gdb session, we run into a segfault in the inferior: ... $ gdb -batch -q -ex "target remote localhost:12345" -ex continue Program received signal SIGSEGV, Segmentation fault. 0xf7dd8bd2 in init_cacheinfo () at ../sysdeps/x86/cacheinfo.c:761 ... The segfault is caused by gdbserver overwriting $gs_base with 0 using PTRACE_SETREGS. After it is overwritten, the next use of $gs in the inferior will trigger the segfault. Before linux kernel version 5.9, the value used by PTRACE_SETREGS for $gs_base was ignored, but starting version 5.9, the linux kernel has support for intel architecture extension FSGSBASE, which allows users to modify $gs_base, and consequently PTRACE_SETREGS can no longer ignore the $gs_base value. The overwrite of $gs_base with 0 is done by a memset in x86_fill_gregset, which was added in commit 9e0aa64f551 "Fix gdbserver qGetTLSAddr for x86_64 -m32". The memset intends to zero-extend 32-bit registers that are tracked in the regcache to 64-bit when writing them into the PTRACE_SETREGS data argument. But in addition, it overwrites other registers that are not tracked in the regcache, such as $gs_base. Fix the segfault by redoing the fix from commit 9e0aa64f551 in minimal form. Tested on x86_64-linux: - openSUSE Leap 15.2 (using kernel version 5.3.18): - native - gdbserver -m32 - -m32 - openSUSE Factory (using kernel version 5.10.5): - native - m32 gdbserver/ChangeLog: 2021-01-20 Tom de Vries <tdevries@suse.de> * linux-x86-low.cc (collect_register_i386): New function. (x86_fill_gregset): Remove memset. Use collect_register_i386.
2021-01-07[gdb/build] Fix gdbserver build with -fsanitize=addressTom de Vries2-2/+18
When doing a gdbserver build with CFLAGS/CXXFLAGS/LDFLAGS=-fsanitize=address we run into: ... ld: ../libiberty/libiberty.a(safe-ctype.o): relocation R_X86_64_32 against `.data' can not be used when making a shared object; recompile with -fPIC collect2: error: ld returned 1 exit status make[1]: *** [libinproctrace.so] Error 1 ... This started with commit 96648494173 "gdbsupport: make use of safe-ctype functions from libiberty", which introduced a dependency of libinproctrace.so on libiberty. Fix this in gdbserver/Makefile.in by using a setup similar to what is done in gcc-repo/src/libcc1/Makefile.am, such that ../libiberty/noasan/libiberty.a is used instead. Build on x86_64-linux, both with and without -fsanitize=address. gdbserver/ChangeLog: 2021-01-07 Tom de Vries <tdevries@suse.de> * Makefile.in (LIBIBERTY_NORMAL, LIBIBERTY_NOASAN, LIBIBERTY_PIC): (LIBIBERTY_FOR_SHLIB): New var. (LIBIBERTY): Set using $(LIBIBERTY_NORMAL). (IPA_LIB): Use LIBIBERTY_FOR_SHLIB instead of LIBIBERTY in target rule.
2021-01-04gdb: introduce scoped debug printsSimon Marchi2-0/+8
I spent a lot of time reading infrun debug logs recently, and I think they could be made much more readable by being indented, to clearly see what operation is done as part of what other operation. In the current format, there are no visual cues to tell where things start and end, it's just a big flat list. It's also difficult to understand what caused a given operation (e.g. a call to resume_1) to be done. To help with this, I propose to add the new scoped_debug_start_end structure, along with a bunch of macros to make it convenient to use. The idea of scoped_debug_start_end is simply to print a start and end message at construction and destruction. It also increments/decrements a depth counter in order to make debug statements printed during this range use some indentation. Some care is taken to handle the fact that debug can be turned on or off in the middle of such a range. For example, a "set debug foo 1" command in a breakpoint command, or a superior GDB manually changing the debug_foo variable. Two macros are added in gdbsupport/common-debug.h, which are helpers to define module-specific macros: - scoped_debug_start_end: takes a message that is printed both at construction / destruction, with "start: " and "end: " prefixes. - scoped_debug_enter_exit: prints hard-coded "enter" and "exit" messages, to denote the entry and exit of a function. I added some examples in the infrun module to give an idea of how it can be used and what the result looks like. The macros are in capital letters (INFRUN_SCOPED_DEBUG_START_END and INFRUN_SCOPED_DEBUG_ENTER_EXIT) to mimic the existing SCOPE_EXIT, but that can be changed if you prefer something else. Here's an excerpt of the debug statements printed when doing "continue", where a displaced step is started: [infrun] proceed: enter [infrun] proceed: addr=0xffffffffffffffff, signal=GDB_SIGNAL_DEFAULT [infrun] global_thread_step_over_chain_enqueue: enqueueing thread Thread 0x7ffff75a5640 (LWP 2289301) in global step over chain [infrun] start_step_over: enter [infrun] start_step_over: stealing global queue of threads to step, length = 1 [infrun] start_step_over: resuming [Thread 0x7ffff75a5640 (LWP 2289301)] for step-over [infrun] resume_1: step=1, signal=GDB_SIGNAL_0, trap_expected=1, current thread [Thread 0x7ffff75a5640 (LWP 2289301)] at 0x5555555551bd [displaced] displaced_step_prepare_throw: displaced-stepping Thread 0x7ffff75a5640 (LWP 2289301) now [displaced] prepare: selected buffer at 0x5555555550c2 [displaced] prepare: saved 0x5555555550c2: 1e fa 31 ed 49 89 d1 5e 48 89 e2 48 83 e4 f0 50 [displaced] amd64_displaced_step_copy_insn: copy 0x5555555551bd->0x5555555550c2: c7 45 fc 00 00 00 00 eb 13 8b 05 d4 2e 00 00 83 [displaced] displaced_step_prepare_throw: prepared successfully thread=Thread 0x7ffff75a5640 (LWP 2289301), original_pc=0x5555555551bd, displaced_pc=0x5555555550c2 [displaced] resume_1: run 0x5555555550c2: c7 45 fc 00 [infrun] infrun_async: enable=1 [infrun] prepare_to_wait: prepare_to_wait [infrun] start_step_over: [Thread 0x7ffff75a5640 (LWP 2289301)] was resumed. [infrun] operator(): step-over queue now empty [infrun] start_step_over: exit [infrun] proceed: start: resuming threads, all-stop-on-top-of-non-stop [infrun] proceed: resuming Thread 0x7ffff7da7740 (LWP 2289296) [infrun] resume_1: step=0, signal=GDB_SIGNAL_0, trap_expected=0, current thread [Thread 0x7ffff7da7740 (LWP 2289296)] at 0x7ffff7f7d9b7 [infrun] prepare_to_wait: prepare_to_wait [infrun] proceed: resuming Thread 0x7ffff7da6640 (LWP 2289300) [infrun] resume_1: thread Thread 0x7ffff7da6640 (LWP 2289300) has pending wait status status->kind = stopped, signal = GDB_SIGNAL_TRAP (currently_stepping=0). [infrun] prepare_to_wait: prepare_to_wait [infrun] proceed: [Thread 0x7ffff75a5640 (LWP 2289301)] resumed [infrun] proceed: resuming Thread 0x7ffff6da4640 (LWP 2289302) [infrun] resume_1: thread Thread 0x7ffff6da4640 (LWP 2289302) has pending wait status status->kind = stopped, signal = GDB_SIGNAL_TRAP (currently_stepping=0). [infrun] prepare_to_wait: prepare_to_wait [infrun] proceed: end: resuming threads, all-stop-on-top-of-non-stop [infrun] proceed: exit We can easily see where the call to `proceed` starts and end. We can also see why there are a bunch of resume_1 calls, it's because we are resuming threads, emulating all-stop on top of a non-stop target. We also see that debug statements nest well with other modules that have been migrated to use the "new" debug statement helpers (because they all use debug_prefixed_vprintf in the end. I think this is desirable, for example we could see the debug statements about reading the DWARF info of a library nested under the debug statements about loading that library. Of course, modules that haven't been migrated to use the "new" helpers will still print without indentations. This will be one good reason to migrate them. I think the runtime cost (when debug statements are disabled) of this is reasonable, given the improvement in readability. There is the cost of the conditionals (like standard debug statements), one more condition (if (m_must_decrement_print_depth)) and the cost of constructing a stack object, which means copying a fews pointers. Adding the print in fetch_inferior_event breaks some tests that use "set debug infrun", because it prints a debug statement after the prompt. I adapted these tests to cope with it, by using the "-prompt" switch of gdb_test_multiple to as if this debug statement is part of the expected prompt. It's unfortunate that we have to do this, but I think the debug print is useful, and I don't want a few tests to get in the way of adding good debug output. gdbsupport/ChangeLog: * common-debug.h (debug_print_depth): New. (struct scoped_debug_start_end): New. (scoped_debug_start_end): New. (scoped_debug_enter_exit): New. * common-debug.cc (debug_prefixed_vprintf): Print indentation. gdb/ChangeLog: * debug.c (debug_print_depth): New. * infrun.h (INFRUN_SCOPED_DEBUG_START_END): New. (INFRUN_SCOPED_DEBUG_ENTER_EXIT): New. * infrun.c (start_step_over): Use INFRUN_SCOPED_DEBUG_ENTER_EXIT. (proceed): Use INFRUN_SCOPED_DEBUG_ENTER_EXIT and INFRUN_SCOPED_DEBUG_START_END. (fetch_inferior_event): Use INFRUN_SCOPED_DEBUG_ENTER_EXIT. gdbserver/ChangeLog: * debug.cc (debug_print_depth): New. gdb/testsuite/ChangeLog: * gdb.base/ui-redirect.exp: Expect infrun debug print after prompt. * gdb.threads/ia64-sigill.exp: Likewise. * gdb.threads/watchthreads-reorder.exp: Likewise. Change-Id: I7c3805e6487807aa63a1bae318876a0c69dce949
2021-01-01Update copyright year range in all GDB filesJoel Brobecker88-88/+88
This commits the result of running gdb/copyright.py as per our Start of New Year procedure... gdb/ChangeLog Update copyright year range in copyright header of all GDB files.
2021-01-01Update copyright year in version message for gdb, gdbserver and gdbreplayJoel Brobecker3-2/+7
gdb/ChangeLog: * top.c (print_gdb_version): Update copyright year. gdbserver/ChangeLog: * server.cc (gdbserver_version): Update copyright year. * gdbreplay.cc (gdbreplay_version): Likewise.
2020-12-16Fix TBI handling for watchpointsLuis Machado2-1/+28
When inserting hw watchpoints, we take care of masking off the top byte of the address (and sign-extending it if needed). This guarantees we won't pass tagged addresses to the kernel via ptrace. However, from the kernel documentation on tagged pointers... "Non-zero tags are not preserved when delivering signals. This means that signal handlers in applications making use of tags cannot rely on the tag information for user virtual addresses being maintained for fields inside siginfo_t. One exception to this rule is for signals raised in response to watchpoint debug exceptions, where the tag information will be preserved." So the stopped data address after a hw watchpoint hit can be potentially tagged, and we don't handle this in GDB at the moment. This results in GDB missing a hw watchpoint hit and attempting to step over an unsteppable hw watchpoint, causing it to spin endlessly. The following patch fixes this by adjusting the stopped data address and adds some tests to expose the problem. gdb/ChangeLog: 2020-12-16 Luis Machado <luis.machado@linaro.org> * aarch64-linux-nat.c (aarch64_linux_nat_target::stopped_data_address): Handle the TBI. gdbserver/ChangeLog: 2020-12-16 Luis Machado <luis.machado@linaro.org> * linux-aarch64-low.cc (address_significant): New function. (aarch64_target::low_stopped_data_address): Handle the TBI. gdb/testsuite/ChangeLog: 2020-12-16 Luis Machado <luis.machado@linaro.org> * gdb.arch/aarch64-tagged-pointer.c (main): Add a few more pointer-based memory accesses. * gdb.arch/aarch64-tagged-pointer.exp: Exercise additional hw watchpoint cases.
2020-12-11gdbsupport: make use of safe-ctype functions from libibertyAndrew Burgess2-1/+5
Make use of the safe-ctype replacements for the standard ctype character checking functions in gdbsupport/common-utils.cc. The gdbsupport library is included into both gdb and gdbserver, and on the gdbserver side there are two targets, gdbserver itself, and also libinproctrace.so. libiberty was already being included in the gdbserver link command, but was missing from the libinproctrace.so link. As a result, after changing gdbsupport/common-utils.cc to depend on libiberty, libinproctrace.so would no longer link until I modified its link line. gdbserver/ChangeLog: * Makefile.in (IPA_LIB): Include libiberty library. gdbsupport/ChangeLog: * gdbsupport/common-utils.cc: Change 'ctype.h' include to 'safe-ctype.h'. (extract_string_maybe_quoted): Use safe-ctype function versions. (is_digit_in_base): Likewise. (digit_to_int): Likewise. (strtoulst): Likewise. (skip_spaces): Likewise. (skip_to_space): Likewise.
2020-11-11gdbserver: add missing --disable-packet options to help textAndrew Burgess2-2/+8
The help text for the --disable-packet option was missing one of the possible values. As this option is for maintainers only it is explicitly not documented in gdb/doc/gdb.texinfo, so no update is needed there. gdbserver/ChangeLog: * server.cc (gdbserver_usage): Add missing option to usage text. (gdbserver_show_disableable): Likewise.
2020-11-02gdb, gdbserver, gdbsupport: fix leading space vs tabs issuesSimon Marchi13-32/+47
Many spots incorrectly use only spaces for indentation (for example, there are a lot of spots in ada-lang.c). I've always found it awkward when I needed to edit one of these spots: do I keep the original wrong indentation, or do I fix it? What if the lines around it are also wrong, do I fix them too? I probably don't want to fix them in the same patch, to avoid adding noise to my patch. So I propose to fix as much as possible once and for all (hopefully). One typical counter argument for this is that it makes code archeology more difficult, because git-blame will show this commit as the last change for these lines. My counter counter argument is: when git-blaming, you often need to do "blame the file at the parent commit" anyway, to go past some other refactor that touched the line you are interested in, but is not the change you are looking for. So you already need a somewhat efficient way to do this. Using some interactive tool, rather than plain git-blame, makes this trivial. For example, I use "tig blame <file>", where going back past the commit that changed the currently selected line is one keystroke. It looks like Magit in Emacs does it too (though I've never used it). Web viewers of Github and Gitlab do it too. My point is that it won't really make archeology more difficult. The other typical counter argument is that it will cause conflicts with existing patches. That's true... but it's a one time cost, and those are not conflicts that are difficult to resolve. I have also tried "git rebase --ignore-whitespace", it seems to work well. Although that will re-introduce the faulty indentation, so one needs to take care of fixing the indentation in the patch after that (which is easy). gdb/ChangeLog: * aarch64-linux-tdep.c: Fix indentation. * aarch64-ravenscar-thread.c: Fix indentation. * aarch64-tdep.c: Fix indentation. * aarch64-tdep.h: Fix indentation. * ada-lang.c: Fix indentation. * ada-lang.h: Fix indentation. * ada-tasks.c: Fix indentation. * ada-typeprint.c: Fix indentation. * ada-valprint.c: Fix indentation. * ada-varobj.c: Fix indentation. * addrmap.c: Fix indentation. * addrmap.h: Fix indentation. * agent.c: Fix indentation. * aix-thread.c: Fix indentation. * alpha-bsd-nat.c: Fix indentation. * alpha-linux-tdep.c: Fix indentation. * alpha-mdebug-tdep.c: Fix indentation. * alpha-nbsd-tdep.c: Fix indentation. * alpha-obsd-tdep.c: Fix indentation. * alpha-tdep.c: Fix indentation. * amd64-bsd-nat.c: Fix indentation. * amd64-darwin-tdep.c: Fix indentation. * amd64-linux-nat.c: Fix indentation. * amd64-linux-tdep.c: Fix indentation. * amd64-nat.c: Fix indentation. * amd64-obsd-tdep.c: Fix indentation. * amd64-tdep.c: Fix indentation. * amd64-windows-tdep.c: Fix indentation. * annotate.c: Fix indentation. * arc-tdep.c: Fix indentation. * arch-utils.c: Fix indentation. * arch/arm-get-next-pcs.c: Fix indentation. * arch/arm.c: Fix indentation. * arm-linux-nat.c: Fix indentation. * arm-linux-tdep.c: Fix indentation. * arm-nbsd-tdep.c: Fix indentation. * arm-pikeos-tdep.c: Fix indentation. * arm-tdep.c: Fix indentation. * arm-tdep.h: Fix indentation. * arm-wince-tdep.c: Fix indentation. * auto-load.c: Fix indentation. * auxv.c: Fix indentation. * avr-tdep.c: Fix indentation. * ax-gdb.c: Fix indentation. * ax-general.c: Fix indentation. * bfin-linux-tdep.c: Fix indentation. * block.c: Fix indentation. * block.h: Fix indentation. * blockframe.c: Fix indentation. * bpf-tdep.c: Fix indentation. * break-catch-sig.c: Fix indentation. * break-catch-syscall.c: Fix indentation. * break-catch-throw.c: Fix indentation. * breakpoint.c: Fix indentation. * breakpoint.h: Fix indentation. * bsd-uthread.c: Fix indentation. * btrace.c: Fix indentation. * build-id.c: Fix indentation. * buildsym-legacy.h: Fix indentation. * buildsym.c: Fix indentation. * c-typeprint.c: Fix indentation. * c-valprint.c: Fix indentation. * c-varobj.c: Fix indentation. * charset.c: Fix indentation. * cli/cli-cmds.c: Fix indentation. * cli/cli-decode.c: Fix indentation. * cli/cli-decode.h: Fix indentation. * cli/cli-script.c: Fix indentation. * cli/cli-setshow.c: Fix indentation. * coff-pe-read.c: Fix indentation. * coffread.c: Fix indentation. * compile/compile-cplus-types.c: Fix indentation. * compile/compile-object-load.c: Fix indentation. * compile/compile-object-run.c: Fix indentation. * completer.c: Fix indentation. * corefile.c: Fix indentation. * corelow.c: Fix indentation. * cp-abi.h: Fix indentation. * cp-namespace.c: Fix indentation. * cp-support.c: Fix indentation. * cp-valprint.c: Fix indentation. * cris-linux-tdep.c: Fix indentation. * cris-tdep.c: Fix indentation. * darwin-nat-info.c: Fix indentation. * darwin-nat.c: Fix indentation. * darwin-nat.h: Fix indentation. * dbxread.c: Fix indentation. * dcache.c: Fix indentation. * disasm.c: Fix indentation. * dtrace-probe.c: Fix indentation. * dwarf2/abbrev.c: Fix indentation. * dwarf2/attribute.c: Fix indentation. * dwarf2/expr.c: Fix indentation. * dwarf2/frame.c: Fix indentation. * dwarf2/index-cache.c: Fix indentation. * dwarf2/index-write.c: Fix indentation. * dwarf2/line-header.c: Fix indentation. * dwarf2/loc.c: Fix indentation. * dwarf2/macro.c: Fix indentation. * dwarf2/read.c: Fix indentation. * dwarf2/read.h: Fix indentation. * elfread.c: Fix indentation. * eval.c: Fix indentation. * event-top.c: Fix indentation. * exec.c: Fix indentation. * exec.h: Fix indentation. * expprint.c: Fix indentation. * f-lang.c: Fix indentation. * f-typeprint.c: Fix indentation. * f-valprint.c: Fix indentation. * fbsd-nat.c: Fix indentation. * fbsd-tdep.c: Fix indentation. * findvar.c: Fix indentation. * fork-child.c: Fix indentation. * frame-unwind.c: Fix indentation. * frame-unwind.h: Fix indentation. * frame.c: Fix indentation. * frv-linux-tdep.c: Fix indentation. * frv-tdep.c: Fix indentation. * frv-tdep.h: Fix indentation. * ft32-tdep.c: Fix indentation. * gcore.c: Fix indentation. * gdb_bfd.c: Fix indentation. * gdbarch.sh: Fix indentation. * gdbarch.c: Re-generate * gdbarch.h: Re-generate. * gdbcore.h: Fix indentation. * gdbthread.h: Fix indentation. * gdbtypes.c: Fix indentation. * gdbtypes.h: Fix indentation. * glibc-tdep.c: Fix indentation. * gnu-nat.c: Fix indentation. * gnu-nat.h: Fix indentation. * gnu-v2-abi.c: Fix indentation. * gnu-v3-abi.c: Fix indentation. * go32-nat.c: Fix indentation. * guile/guile-internal.h: Fix indentation. * guile/scm-cmd.c: Fix indentation. * guile/scm-frame.c: Fix indentation. * guile/scm-iterator.c: Fix indentation. * guile/scm-math.c: Fix indentation. * guile/scm-ports.c: Fix indentation. * guile/scm-pretty-print.c: Fix indentation. * guile/scm-value.c: Fix indentation. * h8300-tdep.c: Fix indentation. * hppa-linux-nat.c: Fix indentation. * hppa-linux-tdep.c: Fix indentation. * hppa-nbsd-nat.c: Fix indentation. * hppa-nbsd-tdep.c: Fix indentation. * hppa-obsd-nat.c: Fix indentation. * hppa-tdep.c: Fix indentation. * hppa-tdep.h: Fix indentation. * i386-bsd-nat.c: Fix indentation. * i386-darwin-nat.c: Fix indentation. * i386-darwin-tdep.c: Fix indentation. * i386-dicos-tdep.c: Fix indentation. * i386-gnu-nat.c: Fix indentation. * i386-linux-nat.c: Fix indentation. * i386-linux-tdep.c: Fix indentation. * i386-nto-tdep.c: Fix indentation. * i386-obsd-tdep.c: Fix indentation. * i386-sol2-nat.c: Fix indentation. * i386-tdep.c: Fix indentation. * i386-tdep.h: Fix indentation. * i386-windows-tdep.c: Fix indentation. * i387-tdep.c: Fix indentation. * i387-tdep.h: Fix indentation. * ia64-libunwind-tdep.c: Fix indentation. * ia64-libunwind-tdep.h: Fix indentation. * ia64-linux-nat.c: Fix indentation. * ia64-linux-tdep.c: Fix indentation. * ia64-tdep.c: Fix indentation. * ia64-tdep.h: Fix indentation. * ia64-vms-tdep.c: Fix indentation. * infcall.c: Fix indentation. * infcmd.c: Fix indentation. * inferior.c: Fix indentation. * infrun.c: Fix indentation. * iq2000-tdep.c: Fix indentation. * language.c: Fix indentation. * linespec.c: Fix indentation. * linux-fork.c: Fix indentation. * linux-nat.c: Fix indentation. * linux-tdep.c: Fix indentation. * linux-thread-db.c: Fix indentation. * lm32-tdep.c: Fix indentation. * m2-lang.c: Fix indentation. * m2-typeprint.c: Fix indentation. * m2-valprint.c: Fix indentation. * m32c-tdep.c: Fix indentation. * m32r-linux-tdep.c: Fix indentation. * m32r-tdep.c: Fix indentation. * m68hc11-tdep.c: Fix indentation. * m68k-bsd-nat.c: Fix indentation. * m68k-linux-nat.c: Fix indentation. * m68k-linux-tdep.c: Fix indentation. * m68k-tdep.c: Fix indentation. * machoread.c: Fix indentation. * macrocmd.c: Fix indentation. * macroexp.c: Fix indentation. * macroscope.c: Fix indentation. * macrotab.c: Fix indentation. * macrotab.h: Fix indentation. * main.c: Fix indentation. * mdebugread.c: Fix indentation. * mep-tdep.c: Fix indentation. * mi/mi-cmd-catch.c: Fix indentation. * mi/mi-cmd-disas.c: Fix indentation. * mi/mi-cmd-env.c: Fix indentation. * mi/mi-cmd-stack.c: Fix indentation. * mi/mi-cmd-var.c: Fix indentation. * mi/mi-cmds.c: Fix indentation. * mi/mi-main.c: Fix indentation. * mi/mi-parse.c: Fix indentation. * microblaze-tdep.c: Fix indentation. * minidebug.c: Fix indentation. * minsyms.c: Fix indentation. * mips-linux-nat.c: Fix indentation. * mips-linux-tdep.c: Fix indentation. * mips-nbsd-tdep.c: Fix indentation. * mips-tdep.c: Fix indentation. * mn10300-linux-tdep.c: Fix indentation. * mn10300-tdep.c: Fix indentation. * moxie-tdep.c: Fix indentation. * msp430-tdep.c: Fix indentation. * namespace.h: Fix indentation. * nat/fork-inferior.c: Fix indentation. * nat/gdb_ptrace.h: Fix indentation. * nat/linux-namespaces.c: Fix indentation. * nat/linux-osdata.c: Fix indentation. * nat/netbsd-nat.c: Fix indentation. * nat/x86-dregs.c: Fix indentation. * nbsd-nat.c: Fix indentation. * nbsd-tdep.c: Fix indentation. * nios2-linux-tdep.c: Fix indentation. * nios2-tdep.c: Fix indentation. * nto-procfs.c: Fix indentation. * nto-tdep.c: Fix indentation. * objfiles.c: Fix indentation. * objfiles.h: Fix indentation. * opencl-lang.c: Fix indentation. * or1k-tdep.c: Fix indentation. * osabi.c: Fix indentation. * osabi.h: Fix indentation. * osdata.c: Fix indentation. * p-lang.c: Fix indentation. * p-typeprint.c: Fix indentation. * p-valprint.c: Fix indentation. * parse.c: Fix indentation. * ppc-linux-nat.c: Fix indentation. * ppc-linux-tdep.c: Fix indentation. * ppc-nbsd-nat.c: Fix indentation. * ppc-nbsd-tdep.c: Fix indentation. * ppc-obsd-nat.c: Fix indentation. * ppc-ravenscar-thread.c: Fix indentation. * ppc-sysv-tdep.c: Fix indentation. * ppc64-tdep.c: Fix indentation. * printcmd.c: Fix indentation. * proc-api.c: Fix indentation. * producer.c: Fix indentation. * producer.h: Fix indentation. * prologue-value.c: Fix indentation. * prologue-value.h: Fix indentation. * psymtab.c: Fix indentation. * python/py-arch.c: Fix indentation. * python/py-bpevent.c: Fix indentation. * python/py-event.c: Fix indentation. * python/py-event.h: Fix indentation. * python/py-finishbreakpoint.c: Fix indentation. * python/py-frame.c: Fix indentation. * python/py-framefilter.c: Fix indentation. * python/py-inferior.c: Fix indentation. * python/py-infthread.c: Fix indentation. * python/py-objfile.c: Fix indentation. * python/py-prettyprint.c: Fix indentation. * python/py-registers.c: Fix indentation. * python/py-signalevent.c: Fix indentation. * python/py-stopevent.c: Fix indentation. * python/py-stopevent.h: Fix indentation. * python/py-threadevent.c: Fix indentation. * python/py-tui.c: Fix indentation. * python/py-unwind.c: Fix indentation. * python/py-value.c: Fix indentation. * python/py-xmethods.c: Fix indentation. * python/python-internal.h: Fix indentation. * python/python.c: Fix indentation. * ravenscar-thread.c: Fix indentation. * record-btrace.c: Fix indentation. * record-full.c: Fix indentation. * record.c: Fix indentation. * reggroups.c: Fix indentation. * regset.h: Fix indentation. * remote-fileio.c: Fix indentation. * remote.c: Fix indentation. * reverse.c: Fix indentation. * riscv-linux-tdep.c: Fix indentation. * riscv-ravenscar-thread.c: Fix indentation. * riscv-tdep.c: Fix indentation. * rl78-tdep.c: Fix indentation. * rs6000-aix-tdep.c: Fix indentation. * rs6000-lynx178-tdep.c: Fix indentation. * rs6000-nat.c: Fix indentation. * rs6000-tdep.c: Fix indentation. * rust-lang.c: Fix indentation. * rx-tdep.c: Fix indentation. * s12z-tdep.c: Fix indentation. * s390-linux-tdep.c: Fix indentation. * score-tdep.c: Fix indentation. * ser-base.c: Fix indentation. * ser-mingw.c: Fix indentation. * ser-uds.c: Fix indentation. * ser-unix.c: Fix indentation. * serial.c: Fix indentation. * sh-linux-tdep.c: Fix indentation. * sh-nbsd-tdep.c: Fix indentation. * sh-tdep.c: Fix indentation. * skip.c: Fix indentation. * sol-thread.c: Fix indentation. * solib-aix.c: Fix indentation. * solib-darwin.c: Fix indentation. * solib-frv.c: Fix indentation. * solib-svr4.c: Fix indentation. * solib.c: Fix indentation. * source.c: Fix indentation. * sparc-linux-tdep.c: Fix indentation. * sparc-nbsd-tdep.c: Fix indentation. * sparc-obsd-tdep.c: Fix indentation. * sparc-ravenscar-thread.c: Fix indentation. * sparc-tdep.c: Fix indentation. * sparc64-linux-tdep.c: Fix indentation. * sparc64-nbsd-tdep.c: Fix indentation. * sparc64-obsd-tdep.c: Fix indentation. * sparc64-tdep.c: Fix indentation. * stabsread.c: Fix indentation. * stack.c: Fix indentation. * stap-probe.c: Fix indentation. * stubs/ia64vms-stub.c: Fix indentation. * stubs/m32r-stub.c: Fix indentation. * stubs/m68k-stub.c: Fix indentation. * stubs/sh-stub.c: Fix indentation. * stubs/sparc-stub.c: Fix indentation. * symfile-mem.c: Fix indentation. * symfile.c: Fix indentation. * symfile.h: Fix indentation. * symmisc.c: Fix indentation. * symtab.c: Fix indentation. * symtab.h: Fix indentation. * target-float.c: Fix indentation. * target.c: Fix indentation. * target.h: Fix indentation. * tic6x-tdep.c: Fix indentation. * tilegx-linux-tdep.c: Fix indentation. * tilegx-tdep.c: Fix indentation. * top.c: Fix indentation. * tracefile-tfile.c: Fix indentation. * tracepoint.c: Fix indentation. * tui/tui-disasm.c: Fix indentation. * tui/tui-io.c: Fix indentation. * tui/tui-regs.c: Fix indentation. * tui/tui-stack.c: Fix indentation. * tui/tui-win.c: Fix indentation. * tui/tui-winsource.c: Fix indentation. * tui/tui.c: Fix indentation. * typeprint.c: Fix indentation. * ui-out.h: Fix indentation. * unittests/copy_bitwise-selftests.c: Fix indentation. * unittests/memory-map-selftests.c: Fix indentation. * utils.c: Fix indentation. * v850-tdep.c: Fix indentation. * valarith.c: Fix indentation. * valops.c: Fix indentation. * valprint.c: Fix indentation. * valprint.h: Fix indentation. * value.c: Fix indentation. * value.h: Fix indentation. * varobj.c: Fix indentation. * vax-tdep.c: Fix indentation. * windows-nat.c: Fix indentation. * windows-tdep.c: Fix indentation. * xcoffread.c: Fix indentation. * xml-syscall.c: Fix indentation. * xml-tdesc.c: Fix indentation. * xstormy16-tdep.c: Fix indentation. * xtensa-config.c: Fix indentation. * xtensa-linux-nat.c: Fix indentation. * xtensa-linux-tdep.c: Fix indentation. * xtensa-tdep.c: Fix indentation. gdbserver/ChangeLog: * ax.cc: Fix indentation. * dll.cc: Fix indentation. * inferiors.h: Fix indentation. * linux-low.cc: Fix indentation. * linux-nios2-low.cc: Fix indentation. * linux-ppc-ipa.cc: Fix indentation. * linux-ppc-low.cc: Fix indentation. * linux-x86-low.cc: Fix indentation. * linux-xtensa-low.cc: Fix indentation. * regcache.cc: Fix indentation. * server.cc: Fix indentation. * tracepoint.cc: Fix indentation. gdbsupport/ChangeLog: * common-exceptions.h: Fix indentation. * event-loop.cc: Fix indentation. * fileio.cc: Fix indentation. * filestuff.cc: Fix indentation. * gdb-dlfcn.cc: Fix indentation. * gdb_string_view.h: Fix indentation. * job-control.cc: Fix indentation. * signals.cc: Fix indentation. Change-Id: I4bad7ae6be0fbe14168b8ebafb98ffe14964a695
2020-10-31gdbserver: replace AC_TRY_COMPILE in acinclude.m4Simon Marchi3-25/+33
... with AC_COMPILE_IFELSE and AC_LANG_PROGRAM. All changes in the generated configure file are insignificant whitespace changes. gdbserver/ChangeLog: * acinclude.m4: Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE + AC_LANG_PROGRAM. * configure: Re-generate. Change-Id: Idab8b5e1a984046b5283940c02e5a22da2291d58
2020-10-31gdbsupport: replace AC_TRY_COMPILE in common.m4Simon Marchi2-4/+11
... with AC_COMPILE_IFELSE + AC_LANG_PROGRAM. All the changes in the generated configure files are insignificant whitespace changes. gdb/ChangeLog: * configure: Re-generate. gdbserver/ChangeLog: * configure: Re-generate. gdbsupport/ChangeLog: * common.m4: Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE + AC_LANG_PROGRAM. * configure: Re-generate. Change-Id: Id58e6e887f6be817d52b189921845838031dbd2a
2020-10-31gdbsupport: replace AC_TRY_COMPILE in warning.m4Simon Marchi2-3/+8
Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE + AC_LANG_PROGRAM. All changes in generated configure files are insignificant whitespace changes. gdb/ChangeLog: * configure: Re-generate. gdbserver/ChangeLog: * configure: Re-generate. gdbsupport/ChangeLog: * configure: Re-generate. * warning.m4: Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE + AC_LANG_PROGRAM. Change-Id: I517bd20ec3af960ad999a586761df0ac8959a3fc
2020-10-31gdbsupport: replace AC_TRY_COMPILE in ptrace.m4Simon Marchi2-1/+10
Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE + AC_LANG_PROGRAM. All the changes in the generated configure files are insignificant whitespace changes. gdb/ChangeLog: * configure: Re-generate. gdbserver/ChangeLog: * configure: Re-generate. gdbsupport/ChangeLog: * configure: Re-generate. * ptrace.m4: Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE + AC_LANG_PROGRAM. Change-Id: Ia782b5477fe49dad04e68c0f41c6d8ab3fde5bf0
2020-10-31gdbsupport: re-indent ptrace.m4Simon Marchi2-27/+32
For some reason, autoupdate isn't able to grok ptrace.m4: $ autoupdate ptrace.m4 /usr/bin/m4:/tmp/auYjuodw/input.m4:171: ERROR: end of file in string autoupdate: /usr/bin/m4 failed with exit status: 1 Honestly, I'm unable to grok it either. This patch re-indents it in a way that I think is easier to read. With this patch applied, autoupdate becomes able to parse ptrace.m4, but I chose to keep this re-indent in a patch of its own. All the changes in generated configure files consist of insignificant whitespace changes. gdb/ChangeLog: * configure: Re-generate. gdbserver/ChangeLog: * configure: Re-generate. gdbsupport/ChangeLog: * configure: Re-generate. * ptrace.m4: Re-indent. Change-Id: Ie2afab09fecc8b6d0cccccb47ac9756f3843881e
2020-10-31gdbserver: modernize configure.acSimon Marchi3-43/+94
Run autoupdate on gdbserver/configure.ac and then tweak it to use easier to read indentation. This removes a few warnings when running `autoreconf -vf -Wall`. * Replace AC_INIT with AC_INIT and no arguments plus AC_CONFIG_SRCDIR. * Replace AC_GNU_SOURCE with AC_USE_SYSTEM_EXTENSIONS. * Replace AC_TRY_COMPILE with AC_COMPILE_IFELSE. * Replace AC_TRY_LINK with AC_LINK_IFELSE. autoupdate gets it right, except this one here: --- a/gdbserver/configure.ac +++ b/gdbserver/configure.ac @@ -304,7 +304,7 @@ if test "$srv_linux_thread_db" = "yes"; then AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[found="-Wl,--dynamic-list" RDYNAMIC='-Wl,--dynamic-list=$(srcdir)/proc-service.list'],[RDYNAMIC="-rdynamic" LDFLAGS="$old_LDFLAGS $RDYNAMIC" - AC_TRY_LINK([], [], + _au_m4_changequote([,])AC_TRY_LINK([], [], [found="-rdynamic"], [found="no" RDYNAMIC=""])]) ... which I had to convert manually. The changes in the generated configure file only contain insignificant whitespace changes, so that gives confidence that the conversion is correct. gdbserver/ChangeLog: * configure.ac: Modernize. * configure: Re-generate. Change-Id: Ia769aaec2aafac595504f477da955e91dffa4d8f
2020-10-31gdb, gdbserver, gdbsupport: use AC_CANONICAL_{BUILD,HOST,TARGET} instead of ↵Simon Marchi3-2/+19
AC_CANONICAL_SYSTEM `autoreconf -Wall` notes that AC_CANONICAL_SYSTEM is obsolete: configure.ac:36: warning: The macro `AC_CANONICAL_SYSTEM' is obsolete. Replace it by AC_CANONICAL_BUILD, AC_CANONICAL_HOST and AC_CANONICAL_TARGET in configure.ac files in gdb, gdbserver and gdbsupport. All three macros may not be needed everywhere, but it is hard to completely audit the configure files to see which are required, so I think it's better (and that there's no downside) to just call all three. gdb/ChangeLog: * configure.ac: Use AC_CANONICAL_{BUILD,HOST,TARGET} instead of AC_CANONICAL_SYSTEM. * configure: Re-generate. gdbserver/ChangeLog: * configure.ac: Use AC_CANONICAL_{BUILD,HOST,TARGET} instead of AC_CANONICAL_SYSTEM. * configure: Re-generate. gdbsupport/ChangeLog: * configure.ac: Use AC_CANONICAL_{BUILD,HOST,TARGET} instead of AC_CANONICAL_SYSTEM. * configure: Re-generate. Change-Id: Ifd0e21f1e478634e768b5de1b8ee06a7f690d863
2020-10-26gdb::handle_eintr, remove need to specify return typePedro Alves2-5/+11
This eliminates the need to specify the return type when using handle_eintr. We let the compiler deduce it for us. Also, use lowercase for function parameter names. Uppercase should only be used on template parameters. gdb/ChangeLog: * nat/linux-waitpid.c: Include "gdbsupport/eintr.h". (my_waitpid): Use gdb::handle_eintr. gdbserver/ChangeLog: * netbsd-low.cc (netbsd_waitpid, netbsd_process_target::kill) (netbsd_qxfer_libraries_svr4): Use gdb::handle_eintr without explicit type. gdbsupport/ChangeLog: * eintr.h (handle_eintr): Replace Ret template parameter with ErrorValType. Use it as type of the failure value. Deduce the function's return type using decltype. Use lowercase for function parameter names.
2020-10-25gdb: move ptrace.m4 to gdbsupportSimon Marchi2-1/+5
ptrace.m4, providing the GDB_AC_PTRACE autoconf macro, is used by gdb, gdbserver and gdbsupport. I think it would make sense to move it to gdbsupport. gdb/ChangeLog: * acinclude.m4: Update ptrace.m4 path. * ptrace.m4: Moved to gdbsupport. gdbserver/ChangeLog: * acinclude.m4: Update ptrace.m4 path. gdbsupport/ChangeLog: * Makefile.in: Re-generate. * acinclude.m4: Update ptrace.m4 path. * ptrace.m4: Move here. Change-Id: I849c149fd5dd8c3b2b0af38654fb353e3727871b
2020-10-24gdbserver: re-generate configureSimon Marchi3-2/+21
I get this diff when I re-generate the configure script in gdbserver, probably leftovers from e911c6663bb8 ("Require kinfo_get_file and kinfo_get_vmmap for FreeBSD hosts"). gdbserver/ChangeLog: * config.in: Re-generate. * configure: Re-generate. Change-Id: Id19a72ea9f3e7c7b4fdb0f319c9c0bbad0e39aeb
2020-10-21gdbserver: fix overlap in sprintf argument and bufferSimon Marchi2-2/+9
While trying to build on Cygwin (gcc 10.2.0), I got: CXX server.o /home/Baube/src/binutils-gdb/gdbserver/server.cc: In function 'void handle_general_set(char*)': /home/Baube/src/binutils-gdb/gdbserver/server.cc:832:12: error: 'sprintf' argument 3 overlaps destination object 'own_buf' [-Werror=restrict] 832 | sprintf (own_buf, "E.Unknown thread-events mode requested: %s\n", | ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 833 | mode); | ~~~~~ /home/Baube/src/binutils-gdb/gdbserver/server.cc:553:27: note: destination object referenced by 'restrict'-qualified argument 1 was declared here 553 | handle_general_set (char *own_buf) | ~~~~~~^~~~~~~ There is indeed a problem: mode points somewhere into own_buf. And by the time mode gets formatted as a %s, whatever it points to has been overwritten. I hacked gdbserver to coerce it into that error path, and this is the resulting message: (gdb) p own_buf $1 = 0x629000000200 "E.Unknown thread-events mode requested: ad-events mode requested: 00;10:9020fdf7ff7f0000;thread:p49388.49388;core:e;\n" Fix it by formatting the error string in an std::string first. gdbserver/ChangeLog: * server.cc (handle_general_set): Don't use sprintf with argument overlapping buffer. Change-Id: I4fdf05c0117f63739413dd67ddae7bd6ee414824
2020-10-20Fix undefined behavior in gdbserverTom Tromey2-1/+7
PR gdb/26742 points out some undefined behavior in gdbserver. The bug is that remove_thread does: free_one_thread (thread); if (current_thread == thread) current_thread = NULL; However, the equality check is undefined, because "thread" has already been freed. This patch fixes the bug by moving the check earlier. Tested on x86-64 Fedora 32. 2020-10-20 Tom Tromey <tromey@adacore.com> PR gdb/26742: * inferiors.cc (remove_thread): Clear current_thread before freeing the thread.
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