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6c2659886f
I'd like to enable the -Wmissing-declarations warning. However, it
warns for every _initialize function, for example:
CXX dcache.o
/home/smarchi/src/binutils-gdb/gdb/dcache.c: In function ‘void _initialize_dcache()’:
/home/smarchi/src/binutils-gdb/gdb/dcache.c:688:1: error: no previous declaration for ‘void _initialize_dcache()’ [-Werror=missing-declarations]
_initialize_dcache (void)
^~~~~~~~~~~~~~~~~~
The only practical way forward I found is to add back the declarations,
which were removed by this commit:
commit 481695ed5f
Author: John Baldwin <jhb@FreeBSD.org>
Date: Sat Sep 9 11:02:37 2017 -0700
Remove unnecessary function prototypes.
I don't think it's a big problem to have the declarations for these
functions, but if anybody has a better solution for this, I'll be happy
to use it.
gdb/ChangeLog:
* aarch64-fbsd-nat.c (_initialize_aarch64_fbsd_nat): Add declaration.
* aarch64-fbsd-tdep.c (_initialize_aarch64_fbsd_tdep): Add declaration.
* aarch64-linux-nat.c (_initialize_aarch64_linux_nat): Add declaration.
* aarch64-linux-tdep.c (_initialize_aarch64_linux_tdep): Add declaration.
* aarch64-newlib-tdep.c (_initialize_aarch64_newlib_tdep): Add declaration.
* aarch64-tdep.c (_initialize_aarch64_tdep): Add declaration.
* ada-exp.y (_initialize_ada_exp): Add declaration.
* ada-lang.c (_initialize_ada_language): Add declaration.
* ada-tasks.c (_initialize_tasks): Add declaration.
* agent.c (_initialize_agent): Add declaration.
* aix-thread.c (_initialize_aix_thread): Add declaration.
* alpha-bsd-nat.c (_initialize_alphabsd_nat): Add declaration.
* alpha-linux-nat.c (_initialize_alpha_linux_nat): Add declaration.
* alpha-linux-tdep.c (_initialize_alpha_linux_tdep): Add declaration.
* alpha-nbsd-tdep.c (_initialize_alphanbsd_tdep): Add declaration.
* alpha-obsd-tdep.c (_initialize_alphaobsd_tdep): Add declaration.
* alpha-tdep.c (_initialize_alpha_tdep): Add declaration.
* amd64-darwin-tdep.c (_initialize_amd64_darwin_tdep): Add declaration.
* amd64-dicos-tdep.c (_initialize_amd64_dicos_tdep): Add declaration.
* amd64-fbsd-nat.c (_initialize_amd64fbsd_nat): Add declaration.
* amd64-fbsd-tdep.c (_initialize_amd64fbsd_tdep): Add declaration.
* amd64-linux-nat.c (_initialize_amd64_linux_nat): Add declaration.
* amd64-linux-tdep.c (_initialize_amd64_linux_tdep): Add declaration.
* amd64-nbsd-nat.c (_initialize_amd64nbsd_nat): Add declaration.
* amd64-nbsd-tdep.c (_initialize_amd64nbsd_tdep): Add declaration.
* amd64-obsd-nat.c (_initialize_amd64obsd_nat): Add declaration.
* amd64-obsd-tdep.c (_initialize_amd64obsd_tdep): Add declaration.
* amd64-sol2-tdep.c (_initialize_amd64_sol2_tdep): Add declaration.
* amd64-tdep.c (_initialize_amd64_tdep): Add declaration.
* amd64-windows-nat.c (_initialize_amd64_windows_nat): Add declaration.
* amd64-windows-tdep.c (_initialize_amd64_windows_tdep): Add declaration.
* annotate.c (_initialize_annotate): Add declaration.
* arc-newlib-tdep.c (_initialize_arc_newlib_tdep): Add declaration.
* arc-tdep.c (_initialize_arc_tdep): Add declaration.
* arch-utils.c (_initialize_gdbarch_utils): Add declaration.
* arm-fbsd-nat.c (_initialize_arm_fbsd_nat): Add declaration.
* arm-fbsd-tdep.c (_initialize_arm_fbsd_tdep): Add declaration.
* arm-linux-nat.c (_initialize_arm_linux_nat): Add declaration.
* arm-linux-tdep.c (_initialize_arm_linux_tdep): Add declaration.
* arm-nbsd-nat.c (_initialize_arm_netbsd_nat): Add declaration.
* arm-nbsd-tdep.c (_initialize_arm_netbsd_tdep): Add declaration.
* arm-obsd-tdep.c (_initialize_armobsd_tdep): Add declaration.
* arm-pikeos-tdep.c (_initialize_arm_pikeos_tdep): Add declaration.
* arm-symbian-tdep.c (_initialize_arm_symbian_tdep): Add declaration.
* arm-tdep.c (_initialize_arm_tdep): Add declaration.
* arm-wince-tdep.c (_initialize_arm_wince_tdep): Add declaration.
* auto-load.c (_initialize_auto_load): Add declaration.
* auxv.c (_initialize_auxv): Add declaration.
* avr-tdep.c (_initialize_avr_tdep): Add declaration.
* ax-gdb.c (_initialize_ax_gdb): Add declaration.
* bfin-linux-tdep.c (_initialize_bfin_linux_tdep): Add declaration.
* bfin-tdep.c (_initialize_bfin_tdep): Add declaration.
* break-catch-sig.c (_initialize_break_catch_sig): Add declaration.
* break-catch-syscall.c (_initialize_break_catch_syscall): Add declaration.
* break-catch-throw.c (_initialize_break_catch_throw): Add declaration.
* breakpoint.c (_initialize_breakpoint): Add declaration.
* bsd-uthread.c (_initialize_bsd_uthread): Add declaration.
* btrace.c (_initialize_btrace): Add declaration.
* charset.c (_initialize_charset): Add declaration.
* cli/cli-cmds.c (_initialize_cli_cmds): Add declaration.
* cli/cli-dump.c (_initialize_cli_dump): Add declaration.
* cli/cli-interp.c (_initialize_cli_interp): Add declaration.
* cli/cli-logging.c (_initialize_cli_logging): Add declaration.
* cli/cli-script.c (_initialize_cli_script): Add declaration.
* cli/cli-style.c (_initialize_cli_style): Add declaration.
* coff-pe-read.c (_initialize_coff_pe_read): Add declaration.
* coffread.c (_initialize_coffread): Add declaration.
* compile/compile-cplus-types.c (_initialize_compile_cplus_types): Add declaration.
* compile/compile.c (_initialize_compile): Add declaration.
* complaints.c (_initialize_complaints): Add declaration.
* completer.c (_initialize_completer): Add declaration.
* copying.c (_initialize_copying): Add declaration.
* corefile.c (_initialize_core): Add declaration.
* corelow.c (_initialize_corelow): Add declaration.
* cp-abi.c (_initialize_cp_abi): Add declaration.
* cp-namespace.c (_initialize_cp_namespace): Add declaration.
* cp-support.c (_initialize_cp_support): Add declaration.
* cp-valprint.c (_initialize_cp_valprint): Add declaration.
* cris-linux-tdep.c (_initialize_cris_linux_tdep): Add declaration.
* cris-tdep.c (_initialize_cris_tdep): Add declaration.
* csky-linux-tdep.c (_initialize_csky_linux_tdep): Add declaration.
* csky-tdep.c (_initialize_csky_tdep): Add declaration.
* ctfread.c (_initialize_ctfread): Add declaration.
* d-lang.c (_initialize_d_language): Add declaration.
* darwin-nat-info.c (_initialize_darwin_info_commands): Add declaration.
* darwin-nat.c (_initialize_darwin_nat): Add declaration.
* dbxread.c (_initialize_dbxread): Add declaration.
* dcache.c (_initialize_dcache): Add declaration.
* disasm-selftests.c (_initialize_disasm_selftests): Add declaration.
* disasm.c (_initialize_disasm): Add declaration.
* dtrace-probe.c (_initialize_dtrace_probe): Add declaration.
* dummy-frame.c (_initialize_dummy_frame): Add declaration.
* dwarf-index-cache.c (_initialize_index_cache): Add declaration.
* dwarf-index-write.c (_initialize_dwarf_index_write): Add declaration.
* dwarf2-frame-tailcall.c (_initialize_tailcall_frame): Add declaration.
* dwarf2-frame.c (_initialize_dwarf2_frame): Add declaration.
* dwarf2expr.c (_initialize_dwarf2expr): Add declaration.
* dwarf2loc.c (_initialize_dwarf2loc): Add declaration.
* dwarf2read.c (_initialize_dwarf2_read): Add declaration.
* elfread.c (_initialize_elfread): Add declaration.
* exec.c (_initialize_exec): Add declaration.
* extension.c (_initialize_extension): Add declaration.
* f-lang.c (_initialize_f_language): Add declaration.
* f-valprint.c (_initialize_f_valprint): Add declaration.
* fbsd-nat.c (_initialize_fbsd_nat): Add declaration.
* fbsd-tdep.c (_initialize_fbsd_tdep): Add declaration.
* filesystem.c (_initialize_filesystem): Add declaration.
* findcmd.c (_initialize_mem_search): Add declaration.
* findvar.c (_initialize_findvar): Add declaration.
* fork-child.c (_initialize_fork_child): Add declaration.
* frame-base.c (_initialize_frame_base): Add declaration.
* frame-unwind.c (_initialize_frame_unwind): Add declaration.
* frame.c (_initialize_frame): Add declaration.
* frv-linux-tdep.c (_initialize_frv_linux_tdep): Add declaration.
* frv-tdep.c (_initialize_frv_tdep): Add declaration.
* ft32-tdep.c (_initialize_ft32_tdep): Add declaration.
* gcore.c (_initialize_gcore): Add declaration.
* gdb-demangle.c (_initialize_gdb_demangle): Add declaration.
* gdb_bfd.c (_initialize_gdb_bfd): Add declaration.
* gdbarch-selftests.c (_initialize_gdbarch_selftests): Add declaration.
* gdbarch.c (_initialize_gdbarch): Add declaration.
* gdbtypes.c (_initialize_gdbtypes): Add declaration.
* gnu-nat.c (_initialize_gnu_nat): Add declaration.
* gnu-v2-abi.c (_initialize_gnu_v2_abi): Add declaration.
* gnu-v3-abi.c (_initialize_gnu_v3_abi): Add declaration.
* go-lang.c (_initialize_go_language): Add declaration.
* go32-nat.c (_initialize_go32_nat): Add declaration.
* guile/guile.c (_initialize_guile): Add declaration.
* h8300-tdep.c (_initialize_h8300_tdep): Add declaration.
* hppa-linux-nat.c (_initialize_hppa_linux_nat): Add declaration.
* hppa-linux-tdep.c (_initialize_hppa_linux_tdep): Add declaration.
* hppa-nbsd-nat.c (_initialize_hppanbsd_nat): Add declaration.
* hppa-nbsd-tdep.c (_initialize_hppanbsd_tdep): Add declaration.
* hppa-obsd-nat.c (_initialize_hppaobsd_nat): Add declaration.
* hppa-obsd-tdep.c (_initialize_hppabsd_tdep): Add declaration.
* hppa-tdep.c (_initialize_hppa_tdep): Add declaration.
* i386-bsd-nat.c (_initialize_i386bsd_nat): Add declaration.
* i386-cygwin-tdep.c (_initialize_i386_cygwin_tdep): Add declaration.
* i386-darwin-nat.c (_initialize_i386_darwin_nat): Add declaration.
* i386-darwin-tdep.c (_initialize_i386_darwin_tdep): Add declaration.
* i386-dicos-tdep.c (_initialize_i386_dicos_tdep): Add declaration.
* i386-fbsd-nat.c (_initialize_i386fbsd_nat): Add declaration.
* i386-fbsd-tdep.c (_initialize_i386fbsd_tdep): Add declaration.
* i386-gnu-nat.c (_initialize_i386gnu_nat): Add declaration.
* i386-gnu-tdep.c (_initialize_i386gnu_tdep): Add declaration.
* i386-go32-tdep.c (_initialize_i386_go32_tdep): Add declaration.
* i386-linux-nat.c (_initialize_i386_linux_nat): Add declaration.
* i386-linux-tdep.c (_initialize_i386_linux_tdep): Add declaration.
* i386-nbsd-nat.c (_initialize_i386nbsd_nat): Add declaration.
* i386-nbsd-tdep.c (_initialize_i386nbsd_tdep): Add declaration.
* i386-nto-tdep.c (_initialize_i386nto_tdep): Add declaration.
* i386-obsd-nat.c (_initialize_i386obsd_nat): Add declaration.
* i386-obsd-tdep.c (_initialize_i386obsd_tdep): Add declaration.
* i386-sol2-nat.c (_initialize_amd64_sol2_nat): Add declaration.
* i386-sol2-tdep.c (_initialize_i386_sol2_tdep): Add declaration.
* i386-tdep.c (_initialize_i386_tdep): Add declaration.
* i386-windows-nat.c (_initialize_i386_windows_nat): Add declaration.
* ia64-libunwind-tdep.c (_initialize_libunwind_frame): Add declaration.
* ia64-linux-nat.c (_initialize_ia64_linux_nat): Add declaration.
* ia64-linux-tdep.c (_initialize_ia64_linux_tdep): Add declaration.
* ia64-tdep.c (_initialize_ia64_tdep): Add declaration.
* ia64-vms-tdep.c (_initialize_ia64_vms_tdep): Add declaration.
* infcall.c (_initialize_infcall): Add declaration.
* infcmd.c (_initialize_infcmd): Add declaration.
* inflow.c (_initialize_inflow): Add declaration.
* infrun.c (_initialize_infrun): Add declaration.
* interps.c (_initialize_interpreter): Add declaration.
* iq2000-tdep.c (_initialize_iq2000_tdep): Add declaration.
* jit.c (_initialize_jit): Add declaration.
* language.c (_initialize_language): Add declaration.
* linux-fork.c (_initialize_linux_fork): Add declaration.
* linux-nat.c (_initialize_linux_nat): Add declaration.
* linux-tdep.c (_initialize_linux_tdep): Add declaration.
* linux-thread-db.c (_initialize_thread_db): Add declaration.
* lm32-tdep.c (_initialize_lm32_tdep): Add declaration.
* m2-lang.c (_initialize_m2_language): Add declaration.
* m32c-tdep.c (_initialize_m32c_tdep): Add declaration.
* m32r-linux-nat.c (_initialize_m32r_linux_nat): Add declaration.
* m32r-linux-tdep.c (_initialize_m32r_linux_tdep): Add declaration.
* m32r-tdep.c (_initialize_m32r_tdep): Add declaration.
* m68hc11-tdep.c (_initialize_m68hc11_tdep): Add declaration.
* m68k-bsd-nat.c (_initialize_m68kbsd_nat): Add declaration.
* m68k-bsd-tdep.c (_initialize_m68kbsd_tdep): Add declaration.
* m68k-linux-nat.c (_initialize_m68k_linux_nat): Add declaration.
* m68k-linux-tdep.c (_initialize_m68k_linux_tdep): Add declaration.
* m68k-tdep.c (_initialize_m68k_tdep): Add declaration.
* machoread.c (_initialize_machoread): Add declaration.
* macrocmd.c (_initialize_macrocmd): Add declaration.
* macroscope.c (_initialize_macroscope): Add declaration.
* maint-test-options.c (_initialize_maint_test_options): Add declaration.
* maint-test-settings.c (_initialize_maint_test_settings): Add declaration.
* maint.c (_initialize_maint_cmds): Add declaration.
* mdebugread.c (_initialize_mdebugread): Add declaration.
* memattr.c (_initialize_mem): Add declaration.
* mep-tdep.c (_initialize_mep_tdep): Add declaration.
* mi/mi-cmd-env.c (_initialize_mi_cmd_env): Add declaration.
* mi/mi-cmds.c (_initialize_mi_cmds): Add declaration.
* mi/mi-interp.c (_initialize_mi_interp): Add declaration.
* mi/mi-main.c (_initialize_mi_main): Add declaration.
* microblaze-linux-tdep.c (_initialize_microblaze_linux_tdep): Add declaration.
* microblaze-tdep.c (_initialize_microblaze_tdep): Add declaration.
* mips-fbsd-nat.c (_initialize_mips_fbsd_nat): Add declaration.
* mips-fbsd-tdep.c (_initialize_mips_fbsd_tdep): Add declaration.
* mips-linux-nat.c (_initialize_mips_linux_nat): Add declaration.
* mips-linux-tdep.c (_initialize_mips_linux_tdep): Add declaration.
* mips-nbsd-nat.c (_initialize_mipsnbsd_nat): Add declaration.
* mips-nbsd-tdep.c (_initialize_mipsnbsd_tdep): Add declaration.
* mips-sde-tdep.c (_initialize_mips_sde_tdep): Add declaration.
* mips-tdep.c (_initialize_mips_tdep): Add declaration.
* mips64-obsd-nat.c (_initialize_mips64obsd_nat): Add declaration.
* mips64-obsd-tdep.c (_initialize_mips64obsd_tdep): Add declaration.
* mipsread.c (_initialize_mipsread): Add declaration.
* mn10300-linux-tdep.c (_initialize_mn10300_linux_tdep): Add declaration.
* mn10300-tdep.c (_initialize_mn10300_tdep): Add declaration.
* moxie-tdep.c (_initialize_moxie_tdep): Add declaration.
* msp430-tdep.c (_initialize_msp430_tdep): Add declaration.
* nds32-tdep.c (_initialize_nds32_tdep): Add declaration.
* nios2-linux-tdep.c (_initialize_nios2_linux_tdep): Add declaration.
* nios2-tdep.c (_initialize_nios2_tdep): Add declaration.
* nto-procfs.c (_initialize_procfs): Add declaration.
* objc-lang.c (_initialize_objc_language): Add declaration.
* observable.c (_initialize_observer): Add declaration.
* opencl-lang.c (_initialize_opencl_language): Add declaration.
* or1k-linux-tdep.c (_initialize_or1k_linux_tdep): Add declaration.
* or1k-tdep.c (_initialize_or1k_tdep): Add declaration.
* osabi.c (_initialize_gdb_osabi): Add declaration.
* osdata.c (_initialize_osdata): Add declaration.
* p-valprint.c (_initialize_pascal_valprint): Add declaration.
* parse.c (_initialize_parse): Add declaration.
* ppc-fbsd-nat.c (_initialize_ppcfbsd_nat): Add declaration.
* ppc-fbsd-tdep.c (_initialize_ppcfbsd_tdep): Add declaration.
* ppc-linux-nat.c (_initialize_ppc_linux_nat): Add declaration.
* ppc-linux-tdep.c (_initialize_ppc_linux_tdep): Add declaration.
* ppc-nbsd-nat.c (_initialize_ppcnbsd_nat): Add declaration.
* ppc-nbsd-tdep.c (_initialize_ppcnbsd_tdep): Add declaration.
* ppc-obsd-nat.c (_initialize_ppcobsd_nat): Add declaration.
* ppc-obsd-tdep.c (_initialize_ppcobsd_tdep): Add declaration.
* printcmd.c (_initialize_printcmd): Add declaration.
* probe.c (_initialize_probe): Add declaration.
* proc-api.c (_initialize_proc_api): Add declaration.
* proc-events.c (_initialize_proc_events): Add declaration.
* proc-service.c (_initialize_proc_service): Add declaration.
* procfs.c (_initialize_procfs): Add declaration.
* producer.c (_initialize_producer): Add declaration.
* psymtab.c (_initialize_psymtab): Add declaration.
* python/python.c (_initialize_python): Add declaration.
* ravenscar-thread.c (_initialize_ravenscar): Add declaration.
* record-btrace.c (_initialize_record_btrace): Add declaration.
* record-full.c (_initialize_record_full): Add declaration.
* record.c (_initialize_record): Add declaration.
* regcache-dump.c (_initialize_regcache_dump): Add declaration.
* regcache.c (_initialize_regcache): Add declaration.
* reggroups.c (_initialize_reggroup): Add declaration.
* remote-notif.c (_initialize_notif): Add declaration.
* remote-sim.c (_initialize_remote_sim): Add declaration.
* remote.c (_initialize_remote): Add declaration.
* reverse.c (_initialize_reverse): Add declaration.
* riscv-fbsd-nat.c (_initialize_riscv_fbsd_nat): Add declaration.
* riscv-fbsd-tdep.c (_initialize_riscv_fbsd_tdep): Add declaration.
* riscv-linux-nat.c (_initialize_riscv_linux_nat): Add declaration.
* riscv-linux-tdep.c (_initialize_riscv_linux_tdep): Add declaration.
* riscv-tdep.c (_initialize_riscv_tdep): Add declaration.
* rl78-tdep.c (_initialize_rl78_tdep): Add declaration.
* rs6000-aix-tdep.c (_initialize_rs6000_aix_tdep): Add declaration.
* rs6000-lynx178-tdep.c (_initialize_rs6000_lynx178_tdep):
Add declaration.
* rs6000-nat.c (_initialize_rs6000_nat): Add declaration.
* rs6000-tdep.c (_initialize_rs6000_tdep): Add declaration.
* run-on-main-thread.c (_initialize_run_on_main_thread): Add declaration.
* rust-exp.y (_initialize_rust_exp): Add declaration.
* rx-tdep.c (_initialize_rx_tdep): Add declaration.
* s12z-tdep.c (_initialize_s12z_tdep): Add declaration.
* s390-linux-nat.c (_initialize_s390_nat): Add declaration.
* s390-linux-tdep.c (_initialize_s390_linux_tdep): Add declaration.
* s390-tdep.c (_initialize_s390_tdep): Add declaration.
* score-tdep.c (_initialize_score_tdep): Add declaration.
* ser-go32.c (_initialize_ser_dos): Add declaration.
* ser-mingw.c (_initialize_ser_windows): Add declaration.
* ser-pipe.c (_initialize_ser_pipe): Add declaration.
* ser-tcp.c (_initialize_ser_tcp): Add declaration.
* ser-uds.c (_initialize_ser_socket): Add declaration.
* ser-unix.c (_initialize_ser_hardwire): Add declaration.
* serial.c (_initialize_serial): Add declaration.
* sh-linux-tdep.c (_initialize_sh_linux_tdep): Add declaration.
* sh-nbsd-nat.c (_initialize_shnbsd_nat): Add declaration.
* sh-nbsd-tdep.c (_initialize_shnbsd_tdep): Add declaration.
* sh-tdep.c (_initialize_sh_tdep): Add declaration.
* skip.c (_initialize_step_skip): Add declaration.
* sol-thread.c (_initialize_sol_thread): Add declaration.
* solib-aix.c (_initialize_solib_aix): Add declaration.
* solib-darwin.c (_initialize_darwin_solib): Add declaration.
* solib-dsbt.c (_initialize_dsbt_solib): Add declaration.
* solib-frv.c (_initialize_frv_solib): Add declaration.
* solib-svr4.c (_initialize_svr4_solib): Add declaration.
* solib-target.c (_initialize_solib_target): Add declaration.
* solib.c (_initialize_solib): Add declaration.
* source-cache.c (_initialize_source_cache): Add declaration.
* source.c (_initialize_source): Add declaration.
* sparc-linux-nat.c (_initialize_sparc_linux_nat): Add declaration.
* sparc-linux-tdep.c (_initialize_sparc_linux_tdep): Add declaration.
* sparc-nat.c (_initialize_sparc_nat): Add declaration.
* sparc-nbsd-nat.c (_initialize_sparcnbsd_nat): Add declaration.
* sparc-nbsd-tdep.c (_initialize_sparcnbsd_tdep): Add declaration.
* sparc-obsd-tdep.c (_initialize_sparc32obsd_tdep): Add declaration.
* sparc-sol2-tdep.c (_initialize_sparc_sol2_tdep): Add declaration.
* sparc-tdep.c (_initialize_sparc_tdep): Add declaration.
* sparc64-fbsd-nat.c (_initialize_sparc64fbsd_nat): Add declaration.
* sparc64-fbsd-tdep.c (_initialize_sparc64fbsd_tdep): Add declaration.
* sparc64-linux-nat.c (_initialize_sparc64_linux_nat): Add declaration.
* sparc64-linux-tdep.c (_initialize_sparc64_linux_tdep): Add declaration.
* sparc64-nat.c (_initialize_sparc64_nat): Add declaration.
* sparc64-nbsd-nat.c (_initialize_sparc64nbsd_nat): Add declaration.
* sparc64-nbsd-tdep.c (_initialize_sparc64nbsd_tdep): Add declaration.
* sparc64-obsd-nat.c (_initialize_sparc64obsd_nat): Add declaration.
* sparc64-obsd-tdep.c (_initialize_sparc64obsd_tdep): Add declaration.
* sparc64-sol2-tdep.c (_initialize_sparc64_sol2_tdep): Add declaration.
* sparc64-tdep.c (_initialize_sparc64_adi_tdep): Add declaration.
* stabsread.c (_initialize_stabsread): Add declaration.
* stack.c (_initialize_stack): Add declaration.
* stap-probe.c (_initialize_stap_probe): Add declaration.
* std-regs.c (_initialize_frame_reg): Add declaration.
* symfile-debug.c (_initialize_symfile_debug): Add declaration.
* symfile-mem.c (_initialize_symfile_mem): Add declaration.
* symfile.c (_initialize_symfile): Add declaration.
* symmisc.c (_initialize_symmisc): Add declaration.
* symtab.c (_initialize_symtab): Add declaration.
* target.c (_initialize_target): Add declaration.
* target-connection.c (_initialize_target_connection): Add
declaration.
* target-dcache.c (_initialize_target_dcache): Add declaration.
* target-descriptions.c (_initialize_target_descriptions): Add declaration.
* thread.c (_initialize_thread): Add declaration.
* tic6x-linux-tdep.c (_initialize_tic6x_linux_tdep): Add declaration.
* tic6x-tdep.c (_initialize_tic6x_tdep): Add declaration.
* tilegx-linux-nat.c (_initialize_tile_linux_nat): Add declaration.
* tilegx-linux-tdep.c (_initialize_tilegx_linux_tdep): Add declaration.
* tilegx-tdep.c (_initialize_tilegx_tdep): Add declaration.
* tracectf.c (_initialize_ctf): Add declaration.
* tracefile-tfile.c (_initialize_tracefile_tfile): Add declaration.
* tracefile.c (_initialize_tracefile): Add declaration.
* tracepoint.c (_initialize_tracepoint): Add declaration.
* tui/tui-hooks.c (_initialize_tui_hooks): Add declaration.
* tui/tui-interp.c (_initialize_tui_interp): Add declaration.
* tui/tui-layout.c (_initialize_tui_layout): Add declaration.
* tui/tui-regs.c (_initialize_tui_regs): Add declaration.
* tui/tui-stack.c (_initialize_tui_stack): Add declaration.
* tui/tui-win.c (_initialize_tui_win): Add declaration.
* tui/tui.c (_initialize_tui): Add declaration.
* typeprint.c (_initialize_typeprint): Add declaration.
* ui-style.c (_initialize_ui_style): Add declaration.
* unittests/array-view-selftests.c (_initialize_array_view_selftests): Add declaration.
* unittests/child-path-selftests.c (_initialize_child_path_selftests): Add declaration.
* unittests/cli-utils-selftests.c (_initialize_cli_utils_selftests): Add declaration.
* unittests/common-utils-selftests.c (_initialize_common_utils_selftests): Add declaration.
* unittests/copy_bitwise-selftests.c (_initialize_copy_bitwise_utils_selftests): Add declaration.
* unittests/environ-selftests.c (_initialize_environ_selftests): Add declaration.
* unittests/filtered_iterator-selftests.c
(_initialize_filtered_iterator_selftests): Add declaration.
* unittests/format_pieces-selftests.c (_initialize_format_pieces_selftests): Add declaration.
* unittests/function-view-selftests.c (_initialize_function_view_selftests): Add declaration.
* unittests/help-doc-selftests.c (_initialize_help_doc_selftests): Add declaration.
* unittests/lookup_name_info-selftests.c (_initialize_lookup_name_info_selftests): Add declaration.
* unittests/main-thread-selftests.c
(_initialize_main_thread_selftests): Add declaration.
* unittests/memory-map-selftests.c (_initialize_memory_map_selftests): Add declaration.
* unittests/memrange-selftests.c (_initialize_memrange_selftests): Add declaration.
* unittests/mkdir-recursive-selftests.c (_initialize_mkdir_recursive_selftests): Add declaration.
* unittests/observable-selftests.c (_initialize_observer_selftest): Add declaration.
* unittests/offset-type-selftests.c (_initialize_offset_type_selftests): Add declaration.
* unittests/optional-selftests.c (_initialize_optional_selftests): Add declaration.
* unittests/parse-connection-spec-selftests.c (_initialize_parse_connection_spec_selftests): Add declaration.
* unittests/rsp-low-selftests.c (_initialize_rsp_low_selftests): Add declaration.
* unittests/scoped_fd-selftests.c (_initialize_scoped_fd_selftests): Add declaration.
* unittests/scoped_mmap-selftests.c (_initialize_scoped_mmap_selftests): Add declaration.
* unittests/scoped_restore-selftests.c (_initialize_scoped_restore_selftests): Add declaration.
* unittests/string_view-selftests.c (_initialize_string_view_selftests): Add declaration.
* unittests/style-selftests.c (_initialize_style_selftest): Add declaration.
* unittests/tracepoint-selftests.c (_initialize_tracepoint_selftests): Add declaration.
* unittests/tui-selftests.c (_initialize_tui_selftest): Add
declaration.
* unittests/unpack-selftests.c (_initialize_unpack_selftests): Add declaration.
* unittests/utils-selftests.c (_initialize_utils_selftests): Add declaration.
* unittests/vec-utils-selftests.c (_initialize_vec_utils_selftests): Add declaration.
* unittests/xml-utils-selftests.c (_initialize_xml_utils): Add declaration.
* user-regs.c (_initialize_user_regs): Add declaration.
* utils.c (_initialize_utils): Add declaration.
* v850-tdep.c (_initialize_v850_tdep): Add declaration.
* valops.c (_initialize_valops): Add declaration.
* valprint.c (_initialize_valprint): Add declaration.
* value.c (_initialize_values): Add declaration.
* varobj.c (_initialize_varobj): Add declaration.
* vax-bsd-nat.c (_initialize_vaxbsd_nat): Add declaration.
* vax-nbsd-tdep.c (_initialize_vaxnbsd_tdep): Add declaration.
* vax-tdep.c (_initialize_vax_tdep): Add declaration.
* windows-nat.c (_initialize_windows_nat): Add declaration.
(_initialize_check_for_gdb_ini): Add declaration.
(_initialize_loadable): Add declaration.
* windows-tdep.c (_initialize_windows_tdep): Add declaration.
* x86-bsd-nat.c (_initialize_x86_bsd_nat): Add declaration.
* x86-linux-nat.c (_initialize_x86_linux_nat): Add declaration.
* xcoffread.c (_initialize_xcoffread): Add declaration.
* xml-support.c (_initialize_xml_support): Add declaration.
* xstormy16-tdep.c (_initialize_xstormy16_tdep): Add declaration.
* xtensa-linux-nat.c (_initialize_xtensa_linux_nat): Add declaration.
* xtensa-linux-tdep.c (_initialize_xtensa_linux_tdep): Add declaration.
* xtensa-tdep.c (_initialize_xtensa_tdep): Add declaration.
Change-Id: I13eec7e0ed2b3c427377a7bdb055cf46da64def9
2047 lines
59 KiB
C
2047 lines
59 KiB
C
/* libthread_db assisted debugging support, generic parts.
|
||
|
||
Copyright (C) 1999-2020 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include <dlfcn.h>
|
||
#include "gdb_proc_service.h"
|
||
#include "nat/gdb_thread_db.h"
|
||
#include "gdbsupport/gdb_vecs.h"
|
||
#include "bfd.h"
|
||
#include "command.h"
|
||
#include "gdbcmd.h"
|
||
#include "gdbthread.h"
|
||
#include "inferior.h"
|
||
#include "infrun.h"
|
||
#include "symfile.h"
|
||
#include "objfiles.h"
|
||
#include "target.h"
|
||
#include "regcache.h"
|
||
#include "solib.h"
|
||
#include "solib-svr4.h"
|
||
#include "gdbcore.h"
|
||
#include "observable.h"
|
||
#include "linux-nat.h"
|
||
#include "nat/linux-procfs.h"
|
||
#include "nat/linux-ptrace.h"
|
||
#include "nat/linux-osdata.h"
|
||
#include "auto-load.h"
|
||
#include "cli/cli-utils.h"
|
||
#include <signal.h>
|
||
#include <ctype.h>
|
||
#include "nat/linux-namespaces.h"
|
||
#include <algorithm>
|
||
#include "gdbsupport/pathstuff.h"
|
||
#include "valprint.h"
|
||
#include "cli/cli-style.h"
|
||
|
||
/* GNU/Linux libthread_db support.
|
||
|
||
libthread_db is a library, provided along with libpthread.so, which
|
||
exposes the internals of the thread library to a debugger. It
|
||
allows GDB to find existing threads, new threads as they are
|
||
created, thread IDs (usually, the result of pthread_self), and
|
||
thread-local variables.
|
||
|
||
The libthread_db interface originates on Solaris, where it is both
|
||
more powerful and more complicated. This implementation only works
|
||
for NPTL, the glibc threading library. It assumes that each thread
|
||
is permanently assigned to a single light-weight process (LWP). At
|
||
some point it also supported the older LinuxThreads library, but it
|
||
no longer does.
|
||
|
||
libthread_db-specific information is stored in the "private" field
|
||
of struct thread_info. When the field is NULL we do not yet have
|
||
information about the new thread; this could be temporary (created,
|
||
but the thread library's data structures do not reflect it yet)
|
||
or permanent (created using clone instead of pthread_create).
|
||
|
||
Process IDs managed by linux-thread-db.c match those used by
|
||
linux-nat.c: a common PID for all processes, an LWP ID for each
|
||
thread, and no TID. We save the TID in private. Keeping it out
|
||
of the ptid_t prevents thread IDs changing when libpthread is
|
||
loaded or unloaded. */
|
||
|
||
static const target_info thread_db_target_info = {
|
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"multi-thread",
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N_("multi-threaded child process."),
|
||
N_("Threads and pthreads support.")
|
||
};
|
||
|
||
class thread_db_target final : public target_ops
|
||
{
|
||
public:
|
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const target_info &info () const override
|
||
{ return thread_db_target_info; }
|
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|
||
strata stratum () const override { return thread_stratum; }
|
||
|
||
void detach (inferior *, int) override;
|
||
ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
|
||
void resume (ptid_t, int, enum gdb_signal) override;
|
||
void mourn_inferior () override;
|
||
void update_thread_list () override;
|
||
std::string pid_to_str (ptid_t) override;
|
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CORE_ADDR get_thread_local_address (ptid_t ptid,
|
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CORE_ADDR load_module_addr,
|
||
CORE_ADDR offset) override;
|
||
const char *extra_thread_info (struct thread_info *) override;
|
||
ptid_t get_ada_task_ptid (long lwp, long thread) override;
|
||
|
||
thread_info *thread_handle_to_thread_info (const gdb_byte *thread_handle,
|
||
int handle_len,
|
||
inferior *inf) override;
|
||
gdb::byte_vector thread_info_to_thread_handle (struct thread_info *) override;
|
||
};
|
||
|
||
static char *libthread_db_search_path;
|
||
|
||
/* Set to true if thread_db auto-loading is enabled
|
||
by the "set auto-load libthread-db" command. */
|
||
static bool auto_load_thread_db = true;
|
||
|
||
/* Set to true if load-time libthread_db tests have been enabled
|
||
by the "maintenance set check-libthread-db" command. */
|
||
static bool check_thread_db_on_load = false;
|
||
|
||
/* "show" command for the auto_load_thread_db configuration variable. */
|
||
|
||
static void
|
||
show_auto_load_thread_db (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db "
|
||
"is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
static void
|
||
set_libthread_db_search_path (const char *ignored, int from_tty,
|
||
struct cmd_list_element *c)
|
||
{
|
||
if (*libthread_db_search_path == '\0')
|
||
{
|
||
xfree (libthread_db_search_path);
|
||
libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
|
||
}
|
||
}
|
||
|
||
/* If non-zero, print details of libthread_db processing. */
|
||
|
||
static unsigned int libthread_db_debug;
|
||
|
||
static void
|
||
show_libthread_db_debug (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("libthread-db debugging is %s.\n"), value);
|
||
}
|
||
|
||
/* If we're running on GNU/Linux, we must explicitly attach to any new
|
||
threads. */
|
||
|
||
/* This module's target vector. */
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||
static thread_db_target the_thread_db_target;
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||
|
||
/* Non-zero if we have determined the signals used by the threads
|
||
library. */
|
||
static int thread_signals;
|
||
static sigset_t thread_stop_set;
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||
static sigset_t thread_print_set;
|
||
|
||
struct thread_db_info
|
||
{
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||
struct thread_db_info *next;
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||
|
||
/* The target this thread_db_info is bound to. */
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||
process_stratum_target *process_target;
|
||
|
||
/* Process id this object refers to. */
|
||
int pid;
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||
|
||
/* Handle from dlopen for libthread_db.so. */
|
||
void *handle;
|
||
|
||
/* Absolute pathname from gdb_realpath to disk file used for dlopen-ing
|
||
HANDLE. It may be NULL for system library. */
|
||
char *filename;
|
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|
||
/* Structure that identifies the child process for the
|
||
<proc_service.h> interface. */
|
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struct ps_prochandle proc_handle;
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|
||
/* Connection to the libthread_db library. */
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td_thragent_t *thread_agent;
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|
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/* True if we need to apply the workaround for glibc/BZ5983. When
|
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we catch a PTRACE_O_TRACEFORK, and go query the child's thread
|
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list, nptl_db returns the parent's threads in addition to the new
|
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(single) child thread. If this flag is set, we do extra work to
|
||
be able to ignore such stale entries. */
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int need_stale_parent_threads_check;
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/* Pointers to the libthread_db functions. */
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td_init_ftype *td_init_p;
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td_ta_new_ftype *td_ta_new_p;
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td_ta_delete_ftype *td_ta_delete_p;
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td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p;
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td_ta_thr_iter_ftype *td_ta_thr_iter_p;
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||
td_thr_get_info_ftype *td_thr_get_info_p;
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||
td_thr_tls_get_addr_ftype *td_thr_tls_get_addr_p;
|
||
td_thr_tlsbase_ftype *td_thr_tlsbase_p;
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||
};
|
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|
||
/* List of known processes using thread_db, and the required
|
||
bookkeeping. */
|
||
struct thread_db_info *thread_db_list;
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|
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static void thread_db_find_new_threads_1 (thread_info *stopped);
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static void thread_db_find_new_threads_2 (thread_info *stopped,
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bool until_no_new);
|
||
|
||
static void check_thread_signals (void);
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||
|
||
static struct thread_info *record_thread
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||
(struct thread_db_info *info, struct thread_info *tp,
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ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p);
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||
|
||
/* Add the current inferior to the list of processes using libpthread.
|
||
Return a pointer to the newly allocated object that was added to
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THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing
|
||
LIBTHREAD_DB_SO. */
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||
static struct thread_db_info *
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add_thread_db_info (void *handle)
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||
{
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||
struct thread_db_info *info = XCNEW (struct thread_db_info);
|
||
|
||
info->process_target = current_inferior ()->process_target ();
|
||
info->pid = inferior_ptid.pid ();
|
||
info->handle = handle;
|
||
|
||
/* The workaround works by reading from /proc/pid/status, so it is
|
||
disabled for core files. */
|
||
if (target_has_execution)
|
||
info->need_stale_parent_threads_check = 1;
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||
|
||
info->next = thread_db_list;
|
||
thread_db_list = info;
|
||
|
||
return info;
|
||
}
|
||
|
||
/* Return the thread_db_info object representing the bookkeeping
|
||
related to process PID, if any; NULL otherwise. */
|
||
|
||
static struct thread_db_info *
|
||
get_thread_db_info (process_stratum_target *targ, int pid)
|
||
{
|
||
struct thread_db_info *info;
|
||
|
||
for (info = thread_db_list; info; info = info->next)
|
||
if (targ == info->process_target && pid == info->pid)
|
||
return info;
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static const char *thread_db_err_str (td_err_e err);
|
||
|
||
/* When PID has exited or has been detached, we no longer want to keep
|
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track of it as using libpthread. Call this function to discard
|
||
thread_db related info related to PID. Note that this closes
|
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LIBTHREAD_DB_SO's dlopen'ed handle. */
|
||
|
||
static void
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delete_thread_db_info (process_stratum_target *targ, int pid)
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||
{
|
||
struct thread_db_info *info, *info_prev;
|
||
|
||
info_prev = NULL;
|
||
|
||
for (info = thread_db_list; info; info_prev = info, info = info->next)
|
||
if (targ == info->process_target && pid == info->pid)
|
||
break;
|
||
|
||
if (info == NULL)
|
||
return;
|
||
|
||
if (info->thread_agent != NULL && info->td_ta_delete_p != NULL)
|
||
{
|
||
td_err_e err = info->td_ta_delete_p (info->thread_agent);
|
||
|
||
if (err != TD_OK)
|
||
warning (_("Cannot deregister process %d from libthread_db: %s"),
|
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pid, thread_db_err_str (err));
|
||
info->thread_agent = NULL;
|
||
}
|
||
|
||
if (info->handle != NULL)
|
||
dlclose (info->handle);
|
||
|
||
xfree (info->filename);
|
||
|
||
if (info_prev)
|
||
info_prev->next = info->next;
|
||
else
|
||
thread_db_list = info->next;
|
||
|
||
xfree (info);
|
||
}
|
||
|
||
/* Use "struct private_thread_info" to cache thread state. This is
|
||
a substantial optimization. */
|
||
|
||
struct thread_db_thread_info : public private_thread_info
|
||
{
|
||
/* Flag set when we see a TD_DEATH event for this thread. */
|
||
bool dying = false;
|
||
|
||
/* Cached thread state. */
|
||
td_thrhandle_t th {};
|
||
thread_t tid {};
|
||
};
|
||
|
||
static thread_db_thread_info *
|
||
get_thread_db_thread_info (thread_info *thread)
|
||
{
|
||
return static_cast<thread_db_thread_info *> (thread->priv.get ());
|
||
}
|
||
|
||
static const char *
|
||
thread_db_err_str (td_err_e err)
|
||
{
|
||
static char buf[64];
|
||
|
||
switch (err)
|
||
{
|
||
case TD_OK:
|
||
return "generic 'call succeeded'";
|
||
case TD_ERR:
|
||
return "generic error";
|
||
case TD_NOTHR:
|
||
return "no thread to satisfy query";
|
||
case TD_NOSV:
|
||
return "no sync handle to satisfy query";
|
||
case TD_NOLWP:
|
||
return "no LWP to satisfy query";
|
||
case TD_BADPH:
|
||
return "invalid process handle";
|
||
case TD_BADTH:
|
||
return "invalid thread handle";
|
||
case TD_BADSH:
|
||
return "invalid synchronization handle";
|
||
case TD_BADTA:
|
||
return "invalid thread agent";
|
||
case TD_BADKEY:
|
||
return "invalid key";
|
||
case TD_NOMSG:
|
||
return "no event message for getmsg";
|
||
case TD_NOFPREGS:
|
||
return "FPU register set not available";
|
||
case TD_NOLIBTHREAD:
|
||
return "application not linked with libthread";
|
||
case TD_NOEVENT:
|
||
return "requested event is not supported";
|
||
case TD_NOCAPAB:
|
||
return "capability not available";
|
||
case TD_DBERR:
|
||
return "debugger service failed";
|
||
case TD_NOAPLIC:
|
||
return "operation not applicable to";
|
||
case TD_NOTSD:
|
||
return "no thread-specific data for this thread";
|
||
case TD_MALLOC:
|
||
return "malloc failed";
|
||
case TD_PARTIALREG:
|
||
return "only part of register set was written/read";
|
||
case TD_NOXREGS:
|
||
return "X register set not available for this thread";
|
||
#ifdef THREAD_DB_HAS_TD_NOTALLOC
|
||
case TD_NOTALLOC:
|
||
return "thread has not yet allocated TLS for given module";
|
||
#endif
|
||
#ifdef THREAD_DB_HAS_TD_VERSION
|
||
case TD_VERSION:
|
||
return "versions of libpthread and libthread_db do not match";
|
||
#endif
|
||
#ifdef THREAD_DB_HAS_TD_NOTLS
|
||
case TD_NOTLS:
|
||
return "there is no TLS segment in the given module";
|
||
#endif
|
||
default:
|
||
snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
|
||
return buf;
|
||
}
|
||
}
|
||
|
||
/* Fetch the user-level thread id of PTID. STOPPED is a stopped
|
||
thread that we can use to access memory. */
|
||
|
||
static struct thread_info *
|
||
thread_from_lwp (thread_info *stopped, ptid_t ptid)
|
||
{
|
||
td_thrhandle_t th;
|
||
td_thrinfo_t ti;
|
||
td_err_e err;
|
||
struct thread_db_info *info;
|
||
struct thread_info *tp;
|
||
|
||
/* Just in case td_ta_map_lwp2thr doesn't initialize it completely. */
|
||
th.th_unique = 0;
|
||
|
||
/* This ptid comes from linux-nat.c, which should always fill in the
|
||
LWP. */
|
||
gdb_assert (ptid.lwp () != 0);
|
||
|
||
info = get_thread_db_info (stopped->inf->process_target (), ptid.pid ());
|
||
|
||
/* Access an lwp we know is stopped. */
|
||
info->proc_handle.thread = stopped;
|
||
err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid.lwp (),
|
||
&th);
|
||
if (err != TD_OK)
|
||
error (_("Cannot find user-level thread for LWP %ld: %s"),
|
||
ptid.lwp (), thread_db_err_str (err));
|
||
|
||
err = info->td_thr_get_info_p (&th, &ti);
|
||
if (err != TD_OK)
|
||
error (_("thread_get_info_callback: cannot get thread info: %s"),
|
||
thread_db_err_str (err));
|
||
|
||
/* Fill the cache. */
|
||
tp = find_thread_ptid (stopped->inf->process_target (), ptid);
|
||
return record_thread (info, tp, ptid, &th, &ti);
|
||
}
|
||
|
||
|
||
/* See linux-nat.h. */
|
||
|
||
int
|
||
thread_db_notice_clone (ptid_t parent, ptid_t child)
|
||
{
|
||
struct thread_db_info *info;
|
||
|
||
info = get_thread_db_info (linux_target, child.pid ());
|
||
|
||
if (info == NULL)
|
||
return 0;
|
||
|
||
thread_info *stopped = find_thread_ptid (linux_target, parent);
|
||
|
||
thread_from_lwp (stopped, child);
|
||
|
||
/* If we do not know about the main thread's pthread info yet, this
|
||
would be a good time to find it. */
|
||
thread_from_lwp (stopped, parent);
|
||
return 1;
|
||
}
|
||
|
||
static void *
|
||
verbose_dlsym (void *handle, const char *name)
|
||
{
|
||
void *sym = dlsym (handle, name);
|
||
if (sym == NULL)
|
||
warning (_("Symbol \"%s\" not found in libthread_db: %s"),
|
||
name, dlerror ());
|
||
return sym;
|
||
}
|
||
|
||
/* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and
|
||
return 1 if this version is lower (and not equal) to
|
||
VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */
|
||
|
||
static int
|
||
inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min)
|
||
{
|
||
struct bound_minimal_symbol version_msym;
|
||
CORE_ADDR version_addr;
|
||
gdb::unique_xmalloc_ptr<char> version;
|
||
int err, got, retval = 0;
|
||
|
||
version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL);
|
||
if (version_msym.minsym == NULL)
|
||
return 0;
|
||
|
||
version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym);
|
||
got = target_read_string (version_addr, &version, 32, &err);
|
||
if (err == 0 && memchr (version.get (), 0, got) == version.get () + got - 1)
|
||
{
|
||
int major, minor;
|
||
|
||
retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2
|
||
&& (major < ver_major_min
|
||
|| (major == ver_major_min && minor < ver_minor_min)));
|
||
}
|
||
|
||
return retval;
|
||
}
|
||
|
||
/* Similar as thread_db_find_new_threads_1, but try to silently ignore errors
|
||
if appropriate.
|
||
|
||
Return 1 if the caller should abort libthread_db initialization. Return 0
|
||
otherwise. */
|
||
|
||
static int
|
||
thread_db_find_new_threads_silently (thread_info *stopped)
|
||
{
|
||
|
||
try
|
||
{
|
||
thread_db_find_new_threads_2 (stopped, true);
|
||
}
|
||
|
||
catch (const gdb_exception_error &except)
|
||
{
|
||
if (libthread_db_debug)
|
||
exception_fprintf (gdb_stdlog, except,
|
||
"Warning: thread_db_find_new_threads_silently: ");
|
||
|
||
/* There is a bug fixed between nptl 2.6.1 and 2.7 by
|
||
commit 7d9d8bd18906fdd17364f372b160d7ab896ce909
|
||
where calls to td_thr_get_info fail with TD_ERR for statically linked
|
||
executables if td_thr_get_info is called before glibc has initialized
|
||
itself.
|
||
|
||
If the nptl bug is NOT present in the inferior and still thread_db
|
||
reports an error return 1. It means the inferior has corrupted thread
|
||
list and GDB should fall back only to LWPs.
|
||
|
||
If the nptl bug is present in the inferior return 0 to silently ignore
|
||
such errors, and let gdb enumerate threads again later. In such case
|
||
GDB cannot properly display LWPs if the inferior thread list is
|
||
corrupted. For core files it does not apply, no 'later enumeration'
|
||
is possible. */
|
||
|
||
if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7))
|
||
{
|
||
exception_fprintf (gdb_stderr, except,
|
||
_("Warning: couldn't activate thread debugging "
|
||
"using libthread_db: "));
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Lookup a library in which given symbol resides.
|
||
Note: this is looking in GDB process, not in the inferior.
|
||
Returns library name, or NULL. */
|
||
|
||
static const char *
|
||
dladdr_to_soname (const void *addr)
|
||
{
|
||
Dl_info info;
|
||
|
||
if (dladdr (addr, &info) != 0)
|
||
return info.dli_fname;
|
||
return NULL;
|
||
}
|
||
|
||
/* State for check_thread_db_callback. */
|
||
|
||
struct check_thread_db_info
|
||
{
|
||
/* The libthread_db under test. */
|
||
struct thread_db_info *info;
|
||
|
||
/* True if progress should be logged. */
|
||
bool log_progress;
|
||
|
||
/* True if the callback was called. */
|
||
bool threads_seen;
|
||
|
||
/* Name of last libthread_db function called. */
|
||
const char *last_call;
|
||
|
||
/* Value returned by last libthread_db call. */
|
||
td_err_e last_result;
|
||
};
|
||
|
||
static struct check_thread_db_info *tdb_testinfo;
|
||
|
||
/* Callback for check_thread_db. */
|
||
|
||
static int
|
||
check_thread_db_callback (const td_thrhandle_t *th, void *arg)
|
||
{
|
||
gdb_assert (tdb_testinfo != NULL);
|
||
tdb_testinfo->threads_seen = true;
|
||
|
||
#define LOG(fmt, args...) \
|
||
do \
|
||
{ \
|
||
if (tdb_testinfo->log_progress) \
|
||
{ \
|
||
debug_printf (fmt, ## args); \
|
||
gdb_flush (gdb_stdlog); \
|
||
} \
|
||
} \
|
||
while (0)
|
||
|
||
#define CHECK_1(expr, args...) \
|
||
do \
|
||
{ \
|
||
if (!(expr)) \
|
||
{ \
|
||
LOG (" ... FAIL!\n"); \
|
||
error (args); \
|
||
} \
|
||
} \
|
||
while (0)
|
||
|
||
#define CHECK(expr) \
|
||
CHECK_1 (expr, "(%s) == false", #expr)
|
||
|
||
#define CALL_UNCHECKED(func, args...) \
|
||
do \
|
||
{ \
|
||
tdb_testinfo->last_call = #func; \
|
||
tdb_testinfo->last_result \
|
||
= tdb_testinfo->info->func ## _p (args); \
|
||
} \
|
||
while (0)
|
||
|
||
#define CHECK_CALL() \
|
||
CHECK_1 (tdb_testinfo->last_result == TD_OK, \
|
||
_("%s failed: %s"), \
|
||
tdb_testinfo->last_call, \
|
||
thread_db_err_str (tdb_testinfo->last_result)) \
|
||
|
||
#define CALL(func, args...) \
|
||
do \
|
||
{ \
|
||
CALL_UNCHECKED (func, args); \
|
||
CHECK_CALL (); \
|
||
} \
|
||
while (0)
|
||
|
||
LOG (" Got thread");
|
||
|
||
/* Check td_ta_thr_iter passed consistent arguments. */
|
||
CHECK (th != NULL);
|
||
CHECK (arg == (void *) tdb_testinfo);
|
||
CHECK (th->th_ta_p == tdb_testinfo->info->thread_agent);
|
||
|
||
LOG (" %s", core_addr_to_string_nz ((CORE_ADDR) th->th_unique));
|
||
|
||
/* Check td_thr_get_info. */
|
||
td_thrinfo_t ti;
|
||
CALL (td_thr_get_info, th, &ti);
|
||
|
||
LOG (" => %d", ti.ti_lid);
|
||
|
||
CHECK (ti.ti_ta_p == th->th_ta_p);
|
||
CHECK (ti.ti_tid == (thread_t) th->th_unique);
|
||
|
||
/* Check td_ta_map_lwp2thr. */
|
||
td_thrhandle_t th2;
|
||
memset (&th2, 23, sizeof (td_thrhandle_t));
|
||
CALL_UNCHECKED (td_ta_map_lwp2thr, th->th_ta_p, ti.ti_lid, &th2);
|
||
|
||
if (tdb_testinfo->last_result == TD_ERR && !target_has_execution)
|
||
{
|
||
/* Some platforms require execution for td_ta_map_lwp2thr. */
|
||
LOG (_("; can't map_lwp2thr"));
|
||
}
|
||
else
|
||
{
|
||
CHECK_CALL ();
|
||
|
||
LOG (" => %s", core_addr_to_string_nz ((CORE_ADDR) th2.th_unique));
|
||
|
||
CHECK (memcmp (th, &th2, sizeof (td_thrhandle_t)) == 0);
|
||
}
|
||
|
||
/* Attempt TLS access. Assuming errno is TLS, this calls
|
||
thread_db_get_thread_local_address, which in turn calls
|
||
td_thr_tls_get_addr for live inferiors or td_thr_tlsbase
|
||
for core files. This test is skipped if the thread has
|
||
not been recorded; proceeding in that case would result
|
||
in the test having the side-effect of noticing threads
|
||
which seems wrong.
|
||
|
||
Note that in glibc's libthread_db td_thr_tls_get_addr is
|
||
a thin wrapper around td_thr_tlsbase; this check always
|
||
hits the bulk of the code.
|
||
|
||
Note also that we don't actually check any libthread_db
|
||
calls are made, we just assume they were; future changes
|
||
to how GDB accesses TLS could result in this passing
|
||
without exercising the calls it's supposed to. */
|
||
ptid_t ptid = ptid_t (tdb_testinfo->info->pid, ti.ti_lid, 0);
|
||
thread_info *thread_info = find_thread_ptid (linux_target, ptid);
|
||
if (thread_info != NULL && thread_info->priv != NULL)
|
||
{
|
||
LOG ("; errno");
|
||
|
||
scoped_restore_current_thread restore_current_thread;
|
||
switch_to_thread (thread_info);
|
||
|
||
expression_up expr = parse_expression ("(int) errno");
|
||
struct value *val = evaluate_expression (expr.get ());
|
||
|
||
if (tdb_testinfo->log_progress)
|
||
{
|
||
struct value_print_options opts;
|
||
|
||
get_user_print_options (&opts);
|
||
LOG (" = ");
|
||
value_print (val, gdb_stdlog, &opts);
|
||
}
|
||
}
|
||
|
||
LOG (" ... OK\n");
|
||
|
||
#undef LOG
|
||
#undef CHECK_1
|
||
#undef CHECK
|
||
#undef CALL_UNCHECKED
|
||
#undef CHECK_CALL
|
||
#undef CALL
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Run integrity checks on the dlopen()ed libthread_db described by
|
||
INFO. Returns true on success, displays a warning and returns
|
||
false on failure. Logs progress messages to gdb_stdlog during
|
||
the test if LOG_PROGRESS is true. */
|
||
|
||
static bool
|
||
check_thread_db (struct thread_db_info *info, bool log_progress)
|
||
{
|
||
bool test_passed = true;
|
||
|
||
if (log_progress)
|
||
debug_printf (_("Running libthread_db integrity checks:\n"));
|
||
|
||
/* GDB avoids using td_ta_thr_iter wherever possible (see comment
|
||
in try_thread_db_load_1 below) so in order to test it we may
|
||
have to locate it ourselves. */
|
||
td_ta_thr_iter_ftype *td_ta_thr_iter_p = info->td_ta_thr_iter_p;
|
||
if (td_ta_thr_iter_p == NULL)
|
||
{
|
||
void *thr_iter = verbose_dlsym (info->handle, "td_ta_thr_iter");
|
||
if (thr_iter == NULL)
|
||
return 0;
|
||
|
||
td_ta_thr_iter_p = (td_ta_thr_iter_ftype *) thr_iter;
|
||
}
|
||
|
||
/* Set up the test state we share with the callback. */
|
||
gdb_assert (tdb_testinfo == NULL);
|
||
struct check_thread_db_info tdb_testinfo_buf;
|
||
tdb_testinfo = &tdb_testinfo_buf;
|
||
|
||
memset (tdb_testinfo, 0, sizeof (struct check_thread_db_info));
|
||
tdb_testinfo->info = info;
|
||
tdb_testinfo->log_progress = log_progress;
|
||
|
||
/* td_ta_thr_iter shouldn't be used on running processes. Note that
|
||
it's possible the inferior will stop midway through modifying one
|
||
of its thread lists, in which case the check will spuriously
|
||
fail. */
|
||
linux_stop_and_wait_all_lwps ();
|
||
|
||
try
|
||
{
|
||
td_err_e err = td_ta_thr_iter_p (info->thread_agent,
|
||
check_thread_db_callback,
|
||
tdb_testinfo,
|
||
TD_THR_ANY_STATE,
|
||
TD_THR_LOWEST_PRIORITY,
|
||
TD_SIGNO_MASK,
|
||
TD_THR_ANY_USER_FLAGS);
|
||
|
||
if (err != TD_OK)
|
||
error (_("td_ta_thr_iter failed: %s"), thread_db_err_str (err));
|
||
|
||
if (!tdb_testinfo->threads_seen)
|
||
error (_("no threads seen"));
|
||
}
|
||
catch (const gdb_exception_error &except)
|
||
{
|
||
if (warning_pre_print)
|
||
fputs_unfiltered (warning_pre_print, gdb_stderr);
|
||
|
||
exception_fprintf (gdb_stderr, except,
|
||
_("libthread_db integrity checks failed: "));
|
||
|
||
test_passed = false;
|
||
}
|
||
|
||
if (test_passed && log_progress)
|
||
debug_printf (_("libthread_db integrity checks passed.\n"));
|
||
|
||
tdb_testinfo = NULL;
|
||
|
||
linux_unstop_all_lwps ();
|
||
|
||
return test_passed;
|
||
}
|
||
|
||
/* Attempt to initialize dlopen()ed libthread_db, described by INFO.
|
||
Return true on success.
|
||
Failure could happen if libthread_db does not have symbols we expect,
|
||
or when it refuses to work with the current inferior (e.g. due to
|
||
version mismatch between libthread_db and libpthread). */
|
||
|
||
static bool
|
||
try_thread_db_load_1 (struct thread_db_info *info)
|
||
{
|
||
td_err_e err;
|
||
|
||
/* Initialize pointers to the dynamic library functions we will use.
|
||
Essential functions first. */
|
||
|
||
#define TDB_VERBOSE_DLSYM(info, func) \
|
||
info->func ## _p = (func ## _ftype *) verbose_dlsym (info->handle, #func)
|
||
|
||
#define TDB_DLSYM(info, func) \
|
||
info->func ## _p = (func ## _ftype *) dlsym (info->handle, #func)
|
||
|
||
#define CHK(a) \
|
||
do \
|
||
{ \
|
||
if ((a) == NULL) \
|
||
return false; \
|
||
} while (0)
|
||
|
||
CHK (TDB_VERBOSE_DLSYM (info, td_init));
|
||
|
||
err = info->td_init_p ();
|
||
if (err != TD_OK)
|
||
{
|
||
warning (_("Cannot initialize libthread_db: %s"),
|
||
thread_db_err_str (err));
|
||
return false;
|
||
}
|
||
|
||
CHK (TDB_VERBOSE_DLSYM (info, td_ta_new));
|
||
|
||
/* Initialize the structure that identifies the child process. */
|
||
info->proc_handle.thread = inferior_thread ();
|
||
|
||
/* Now attempt to open a connection to the thread library. */
|
||
err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent);
|
||
if (err != TD_OK)
|
||
{
|
||
if (libthread_db_debug)
|
||
fprintf_unfiltered (gdb_stdlog, _("td_ta_new failed: %s\n"),
|
||
thread_db_err_str (err));
|
||
else
|
||
switch (err)
|
||
{
|
||
case TD_NOLIBTHREAD:
|
||
#ifdef THREAD_DB_HAS_TD_VERSION
|
||
case TD_VERSION:
|
||
#endif
|
||
/* The errors above are not unexpected and silently ignored:
|
||
they just mean we haven't found correct version of
|
||
libthread_db yet. */
|
||
break;
|
||
default:
|
||
warning (_("td_ta_new failed: %s"), thread_db_err_str (err));
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/* These are essential. */
|
||
CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr));
|
||
CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info));
|
||
|
||
/* These are not essential. */
|
||
TDB_DLSYM (info, td_thr_tls_get_addr);
|
||
TDB_DLSYM (info, td_thr_tlsbase);
|
||
TDB_DLSYM (info, td_ta_delete);
|
||
|
||
/* It's best to avoid td_ta_thr_iter if possible. That walks data
|
||
structures in the inferior's address space that may be corrupted,
|
||
or, if the target is running, may change while we walk them. If
|
||
there's execution (and /proc is mounted), then we're already
|
||
attached to all LWPs. Use thread_from_lwp, which uses
|
||
td_ta_map_lwp2thr instead, which does not walk the thread list.
|
||
|
||
td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that
|
||
currently on core targets, as it uses ptrace directly. */
|
||
if (target_has_execution
|
||
&& linux_proc_task_list_dir_exists (inferior_ptid.pid ()))
|
||
info->td_ta_thr_iter_p = NULL;
|
||
else
|
||
CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter));
|
||
|
||
#undef TDB_VERBOSE_DLSYM
|
||
#undef TDB_DLSYM
|
||
#undef CHK
|
||
|
||
/* Run integrity checks if requested. */
|
||
if (check_thread_db_on_load)
|
||
{
|
||
if (!check_thread_db (info, libthread_db_debug))
|
||
return false;
|
||
}
|
||
|
||
if (info->td_ta_thr_iter_p == NULL)
|
||
{
|
||
struct lwp_info *lp;
|
||
int pid = inferior_ptid.pid ();
|
||
thread_info *curr_thread = inferior_thread ();
|
||
|
||
linux_stop_and_wait_all_lwps ();
|
||
|
||
ALL_LWPS (lp)
|
||
if (lp->ptid.pid () == pid)
|
||
thread_from_lwp (curr_thread, lp->ptid);
|
||
|
||
linux_unstop_all_lwps ();
|
||
}
|
||
else if (thread_db_find_new_threads_silently (inferior_thread ()) != 0)
|
||
{
|
||
/* Even if libthread_db initializes, if the thread list is
|
||
corrupted, we'd not manage to list any threads. Better reject this
|
||
thread_db, and fall back to at least listing LWPs. */
|
||
return false;
|
||
}
|
||
|
||
printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
|
||
|
||
if (*libthread_db_search_path || libthread_db_debug)
|
||
{
|
||
struct ui_file *file;
|
||
const char *library;
|
||
|
||
library = dladdr_to_soname ((const void *) *info->td_ta_new_p);
|
||
if (library == NULL)
|
||
library = LIBTHREAD_DB_SO;
|
||
|
||
/* If we'd print this to gdb_stdout when debug output is
|
||
disabled, still print it to gdb_stdout if debug output is
|
||
enabled. User visible output should not depend on debug
|
||
settings. */
|
||
file = *libthread_db_search_path != '\0' ? gdb_stdout : gdb_stdlog;
|
||
fprintf_unfiltered (file,
|
||
_("Using host libthread_db library \"%ps\".\n"),
|
||
styled_string (file_name_style.style (), library));
|
||
}
|
||
|
||
/* The thread library was detected. Activate the thread_db target
|
||
for this process. */
|
||
push_target (&the_thread_db_target);
|
||
return true;
|
||
}
|
||
|
||
/* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute,
|
||
relative, or just LIBTHREAD_DB. */
|
||
|
||
static bool
|
||
try_thread_db_load (const char *library, bool check_auto_load_safe)
|
||
{
|
||
void *handle;
|
||
struct thread_db_info *info;
|
||
|
||
if (libthread_db_debug)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
_("Trying host libthread_db library: %s.\n"),
|
||
library);
|
||
|
||
if (check_auto_load_safe)
|
||
{
|
||
if (access (library, R_OK) != 0)
|
||
{
|
||
/* Do not print warnings by file_is_auto_load_safe if the library does
|
||
not exist at this place. */
|
||
if (libthread_db_debug)
|
||
fprintf_unfiltered (gdb_stdlog, _("open failed: %s.\n"),
|
||
safe_strerror (errno));
|
||
return false;
|
||
}
|
||
|
||
if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db "
|
||
"library \"%s\" from explicit "
|
||
"directory.\n"),
|
||
library))
|
||
return false;
|
||
}
|
||
|
||
handle = dlopen (library, RTLD_NOW);
|
||
if (handle == NULL)
|
||
{
|
||
if (libthread_db_debug)
|
||
fprintf_unfiltered (gdb_stdlog, _("dlopen failed: %s.\n"), dlerror ());
|
||
return false;
|
||
}
|
||
|
||
if (libthread_db_debug && strchr (library, '/') == NULL)
|
||
{
|
||
void *td_init;
|
||
|
||
td_init = dlsym (handle, "td_init");
|
||
if (td_init != NULL)
|
||
{
|
||
const char *const libpath = dladdr_to_soname (td_init);
|
||
|
||
if (libpath != NULL)
|
||
fprintf_unfiltered (gdb_stdlog, _("Host %s resolved to: %s.\n"),
|
||
library, libpath);
|
||
}
|
||
}
|
||
|
||
info = add_thread_db_info (handle);
|
||
|
||
/* Do not save system library name, that one is always trusted. */
|
||
if (strchr (library, '/') != NULL)
|
||
info->filename = gdb_realpath (library).release ();
|
||
|
||
if (try_thread_db_load_1 (info))
|
||
return true;
|
||
|
||
/* This library "refused" to work on current inferior. */
|
||
delete_thread_db_info (current_inferior ()->process_target (),
|
||
inferior_ptid.pid ());
|
||
return false;
|
||
}
|
||
|
||
/* Subroutine of try_thread_db_load_from_pdir to simplify it.
|
||
Try loading libthread_db in directory(OBJ)/SUBDIR.
|
||
SUBDIR may be NULL. It may also be something like "../lib64".
|
||
The result is true for success. */
|
||
|
||
static bool
|
||
try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir)
|
||
{
|
||
const char *obj_name = objfile_name (obj);
|
||
|
||
if (obj_name[0] != '/')
|
||
{
|
||
warning (_("Expected absolute pathname for libpthread in the"
|
||
" inferior, but got %ps."),
|
||
styled_string (file_name_style.style (), obj_name));
|
||
return false;
|
||
}
|
||
|
||
std::string path = obj_name;
|
||
size_t cp = path.rfind ('/');
|
||
/* This should at minimum hit the first character. */
|
||
gdb_assert (cp != std::string::npos);
|
||
path.resize (cp + 1);
|
||
if (subdir != NULL)
|
||
path = path + subdir + "/";
|
||
path += LIBTHREAD_DB_SO;
|
||
|
||
return try_thread_db_load (path.c_str (), true);
|
||
}
|
||
|
||
/* Handle $pdir in libthread-db-search-path.
|
||
Look for libthread_db in directory(libpthread)/SUBDIR.
|
||
SUBDIR may be NULL. It may also be something like "../lib64".
|
||
The result is true for success. */
|
||
|
||
static bool
|
||
try_thread_db_load_from_pdir (const char *subdir)
|
||
{
|
||
if (!auto_load_thread_db)
|
||
return false;
|
||
|
||
for (objfile *obj : current_program_space->objfiles ())
|
||
if (libpthread_name_p (objfile_name (obj)))
|
||
{
|
||
if (try_thread_db_load_from_pdir_1 (obj, subdir))
|
||
return true;
|
||
|
||
/* We may have found the separate-debug-info version of
|
||
libpthread, and it may live in a directory without a matching
|
||
libthread_db. */
|
||
if (obj->separate_debug_objfile_backlink != NULL)
|
||
return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink,
|
||
subdir);
|
||
|
||
return false;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Handle $sdir in libthread-db-search-path.
|
||
Look for libthread_db in the system dirs, or wherever a plain
|
||
dlopen(file_without_path) will look.
|
||
The result is true for success. */
|
||
|
||
static bool
|
||
try_thread_db_load_from_sdir (void)
|
||
{
|
||
return try_thread_db_load (LIBTHREAD_DB_SO, false);
|
||
}
|
||
|
||
/* Try to load libthread_db from directory DIR of length DIR_LEN.
|
||
The result is true for success. */
|
||
|
||
static bool
|
||
try_thread_db_load_from_dir (const char *dir, size_t dir_len)
|
||
{
|
||
if (!auto_load_thread_db)
|
||
return false;
|
||
|
||
std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO;
|
||
|
||
return try_thread_db_load (path.c_str (), true);
|
||
}
|
||
|
||
/* Search libthread_db_search_path for libthread_db which "agrees"
|
||
to work on current inferior.
|
||
The result is true for success. */
|
||
|
||
static bool
|
||
thread_db_load_search (void)
|
||
{
|
||
bool rc = false;
|
||
|
||
std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec
|
||
= dirnames_to_char_ptr_vec (libthread_db_search_path);
|
||
|
||
for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec)
|
||
{
|
||
const char *this_dir = this_dir_up.get ();
|
||
const int pdir_len = sizeof ("$pdir") - 1;
|
||
size_t this_dir_len;
|
||
|
||
this_dir_len = strlen (this_dir);
|
||
|
||
if (strncmp (this_dir, "$pdir", pdir_len) == 0
|
||
&& (this_dir[pdir_len] == '\0'
|
||
|| this_dir[pdir_len] == '/'))
|
||
{
|
||
const char *subdir = NULL;
|
||
|
||
std::string subdir_holder;
|
||
if (this_dir[pdir_len] == '/')
|
||
{
|
||
subdir_holder = std::string (this_dir + pdir_len + 1);
|
||
subdir = subdir_holder.c_str ();
|
||
}
|
||
rc = try_thread_db_load_from_pdir (subdir);
|
||
if (rc)
|
||
break;
|
||
}
|
||
else if (strcmp (this_dir, "$sdir") == 0)
|
||
{
|
||
if (try_thread_db_load_from_sdir ())
|
||
{
|
||
rc = 1;
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (try_thread_db_load_from_dir (this_dir, this_dir_len))
|
||
{
|
||
rc = 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (libthread_db_debug)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
_("thread_db_load_search returning %d\n"), rc);
|
||
return rc;
|
||
}
|
||
|
||
/* Return true if the inferior has a libpthread. */
|
||
|
||
static bool
|
||
has_libpthread (void)
|
||
{
|
||
for (objfile *obj : current_program_space->objfiles ())
|
||
if (libpthread_name_p (objfile_name (obj)))
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Attempt to load and initialize libthread_db.
|
||
Return 1 on success. */
|
||
|
||
static bool
|
||
thread_db_load (void)
|
||
{
|
||
struct thread_db_info *info;
|
||
|
||
info = get_thread_db_info (current_inferior ()->process_target (),
|
||
inferior_ptid.pid ());
|
||
|
||
if (info != NULL)
|
||
return true;
|
||
|
||
/* Don't attempt to use thread_db on executables not running
|
||
yet. */
|
||
if (!target_has_registers)
|
||
return false;
|
||
|
||
/* Don't attempt to use thread_db for remote targets. */
|
||
if (!(target_can_run () || core_bfd))
|
||
return false;
|
||
|
||
if (thread_db_load_search ())
|
||
return true;
|
||
|
||
/* We couldn't find a libthread_db.
|
||
If the inferior has a libpthread warn the user. */
|
||
if (has_libpthread ())
|
||
{
|
||
warning (_("Unable to find libthread_db matching inferior's thread"
|
||
" library, thread debugging will not be available."));
|
||
return false;
|
||
}
|
||
|
||
/* Either this executable isn't using libpthread at all, or it is
|
||
statically linked. Since we can't easily distinguish these two cases,
|
||
no warning is issued. */
|
||
return false;
|
||
}
|
||
|
||
static void
|
||
check_thread_signals (void)
|
||
{
|
||
if (!thread_signals)
|
||
{
|
||
sigset_t mask;
|
||
int i;
|
||
|
||
lin_thread_get_thread_signals (&mask);
|
||
sigemptyset (&thread_stop_set);
|
||
sigemptyset (&thread_print_set);
|
||
|
||
for (i = 1; i < NSIG; i++)
|
||
{
|
||
if (sigismember (&mask, i))
|
||
{
|
||
if (signal_stop_update (gdb_signal_from_host (i), 0))
|
||
sigaddset (&thread_stop_set, i);
|
||
if (signal_print_update (gdb_signal_from_host (i), 0))
|
||
sigaddset (&thread_print_set, i);
|
||
thread_signals = 1;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Check whether thread_db is usable. This function is called when
|
||
an inferior is created (or otherwise acquired, e.g. attached to)
|
||
and when new shared libraries are loaded into a running process. */
|
||
|
||
void
|
||
check_for_thread_db (void)
|
||
{
|
||
/* Do nothing if we couldn't load libthread_db.so.1. */
|
||
if (!thread_db_load ())
|
||
return;
|
||
}
|
||
|
||
/* This function is called via the new_objfile observer. */
|
||
|
||
static void
|
||
thread_db_new_objfile (struct objfile *objfile)
|
||
{
|
||
/* This observer must always be called with inferior_ptid set
|
||
correctly. */
|
||
|
||
if (objfile != NULL
|
||
/* libpthread with separate debug info has its debug info file already
|
||
loaded (and notified without successful thread_db initialization)
|
||
the time gdb::observers::new_objfile.notify is called for the library itself.
|
||
Static executables have their separate debug info loaded already
|
||
before the inferior has started. */
|
||
&& objfile->separate_debug_objfile_backlink == NULL
|
||
/* Only check for thread_db if we loaded libpthread,
|
||
or if this is the main symbol file.
|
||
We need to check OBJF_MAINLINE to handle the case of debugging
|
||
a statically linked executable AND the symbol file is specified AFTER
|
||
the exec file is loaded (e.g., gdb -c core ; file foo).
|
||
For dynamically linked executables, libpthread can be near the end
|
||
of the list of shared libraries to load, and in an app of several
|
||
thousand shared libraries, this can otherwise be painful. */
|
||
&& ((objfile->flags & OBJF_MAINLINE) != 0
|
||
|| libpthread_name_p (objfile_name (objfile))))
|
||
check_for_thread_db ();
|
||
}
|
||
|
||
static void
|
||
check_pid_namespace_match (void)
|
||
{
|
||
/* Check is only relevant for local targets targets. */
|
||
if (target_can_run ())
|
||
{
|
||
/* If the child is in a different PID namespace, its idea of its
|
||
PID will differ from our idea of its PID. When we scan the
|
||
child's thread list, we'll mistakenly think it has no threads
|
||
since the thread PID fields won't match the PID we give to
|
||
libthread_db. */
|
||
if (!linux_ns_same (inferior_ptid.pid (), LINUX_NS_PID))
|
||
{
|
||
warning (_ ("Target and debugger are in different PID "
|
||
"namespaces; thread lists and other data are "
|
||
"likely unreliable. "
|
||
"Connect to gdbserver inside the container."));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* This function is called via the inferior_created observer.
|
||
This handles the case of debugging statically linked executables. */
|
||
|
||
static void
|
||
thread_db_inferior_created (struct target_ops *target, int from_tty)
|
||
{
|
||
check_pid_namespace_match ();
|
||
check_for_thread_db ();
|
||
}
|
||
|
||
/* Update the thread's state (what's displayed in "info threads"),
|
||
from libthread_db thread state information. */
|
||
|
||
static void
|
||
update_thread_state (thread_db_thread_info *priv,
|
||
const td_thrinfo_t *ti_p)
|
||
{
|
||
priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN
|
||
|| ti_p->ti_state == TD_THR_ZOMBIE);
|
||
}
|
||
|
||
/* Record a new thread in GDB's thread list. Creates the thread's
|
||
private info. If TP is NULL or TP is marked as having exited,
|
||
creates a new thread. Otherwise, uses TP. */
|
||
|
||
static struct thread_info *
|
||
record_thread (struct thread_db_info *info,
|
||
struct thread_info *tp,
|
||
ptid_t ptid, const td_thrhandle_t *th_p,
|
||
const td_thrinfo_t *ti_p)
|
||
{
|
||
/* A thread ID of zero may mean the thread library has not
|
||
initialized yet. Leave private == NULL until the thread library
|
||
has initialized. */
|
||
if (ti_p->ti_tid == 0)
|
||
return tp;
|
||
|
||
/* Construct the thread's private data. */
|
||
thread_db_thread_info *priv = new thread_db_thread_info;
|
||
|
||
priv->th = *th_p;
|
||
priv->tid = ti_p->ti_tid;
|
||
update_thread_state (priv, ti_p);
|
||
|
||
/* Add the thread to GDB's thread list. If we already know about a
|
||
thread with this PTID, but it's marked exited, then the kernel
|
||
reused the tid of an old thread. */
|
||
if (tp == NULL || tp->state == THREAD_EXITED)
|
||
tp = add_thread_with_info (info->process_target, ptid, priv);
|
||
else
|
||
tp->priv.reset (priv);
|
||
|
||
if (target_has_execution)
|
||
check_thread_signals ();
|
||
|
||
return tp;
|
||
}
|
||
|
||
void
|
||
thread_db_target::detach (inferior *inf, int from_tty)
|
||
{
|
||
delete_thread_db_info (inf->process_target (), inf->pid);
|
||
|
||
beneath ()->detach (inf, from_tty);
|
||
|
||
/* NOTE: From this point on, inferior_ptid is null_ptid. */
|
||
|
||
/* Detach the thread_db target from this inferior. */
|
||
unpush_target (this);
|
||
}
|
||
|
||
ptid_t
|
||
thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
|
||
int options)
|
||
{
|
||
struct thread_db_info *info;
|
||
|
||
process_stratum_target *beneath
|
||
= as_process_stratum_target (this->beneath ());
|
||
|
||
ptid = beneath->wait (ptid, ourstatus, options);
|
||
|
||
switch (ourstatus->kind)
|
||
{
|
||
case TARGET_WAITKIND_IGNORE:
|
||
case TARGET_WAITKIND_EXITED:
|
||
case TARGET_WAITKIND_THREAD_EXITED:
|
||
case TARGET_WAITKIND_SIGNALLED:
|
||
return ptid;
|
||
}
|
||
|
||
info = get_thread_db_info (beneath, ptid.pid ());
|
||
|
||
/* If this process isn't using thread_db, we're done. */
|
||
if (info == NULL)
|
||
return ptid;
|
||
|
||
if (ourstatus->kind == TARGET_WAITKIND_EXECD)
|
||
{
|
||
/* New image, it may or may not end up using thread_db. Assume
|
||
not unless we find otherwise. */
|
||
delete_thread_db_info (beneath, ptid.pid ());
|
||
unpush_target (this);
|
||
|
||
return ptid;
|
||
}
|
||
|
||
/* Fill in the thread's user-level thread id and status. */
|
||
thread_from_lwp (find_thread_ptid (beneath, ptid), ptid);
|
||
|
||
return ptid;
|
||
}
|
||
|
||
void
|
||
thread_db_target::mourn_inferior ()
|
||
{
|
||
process_stratum_target *target_beneath
|
||
= as_process_stratum_target (this->beneath ());
|
||
|
||
delete_thread_db_info (target_beneath, inferior_ptid.pid ());
|
||
|
||
target_beneath->mourn_inferior ();
|
||
|
||
/* Detach the thread_db target from this inferior. */
|
||
unpush_target (this);
|
||
}
|
||
|
||
struct callback_data
|
||
{
|
||
struct thread_db_info *info;
|
||
int new_threads;
|
||
};
|
||
|
||
static int
|
||
find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
|
||
{
|
||
td_thrinfo_t ti;
|
||
td_err_e err;
|
||
struct thread_info *tp;
|
||
struct callback_data *cb_data = (struct callback_data *) data;
|
||
struct thread_db_info *info = cb_data->info;
|
||
|
||
err = info->td_thr_get_info_p (th_p, &ti);
|
||
if (err != TD_OK)
|
||
error (_("find_new_threads_callback: cannot get thread info: %s"),
|
||
thread_db_err_str (err));
|
||
|
||
if (ti.ti_lid == -1)
|
||
{
|
||
/* A thread with kernel thread ID -1 is either a thread that
|
||
exited and was joined, or a thread that is being created but
|
||
hasn't started yet, and that is reusing the tcb/stack of a
|
||
thread that previously exited and was joined. (glibc marks
|
||
terminated and joined threads with kernel thread ID -1. See
|
||
glibc PR17707. */
|
||
if (libthread_db_debug)
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
"thread_db: skipping exited and "
|
||
"joined thread (0x%lx)\n",
|
||
(unsigned long) ti.ti_tid);
|
||
return 0;
|
||
}
|
||
|
||
if (ti.ti_tid == 0)
|
||
{
|
||
/* A thread ID of zero means that this is the main thread, but
|
||
glibc has not yet initialized thread-local storage and the
|
||
pthread library. We do not know what the thread's TID will
|
||
be yet. */
|
||
|
||
/* In that case, we're not stopped in a fork syscall and don't
|
||
need this glibc bug workaround. */
|
||
info->need_stale_parent_threads_check = 0;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Ignore stale parent threads, caused by glibc/BZ5983. This is a
|
||
bit expensive, as it needs to open /proc/pid/status, so try to
|
||
avoid doing the work if we know we don't have to. */
|
||
if (info->need_stale_parent_threads_check)
|
||
{
|
||
int tgid = linux_proc_get_tgid (ti.ti_lid);
|
||
|
||
if (tgid != -1 && tgid != info->pid)
|
||
return 0;
|
||
}
|
||
|
||
ptid_t ptid (info->pid, ti.ti_lid);
|
||
tp = find_thread_ptid (info->process_target, ptid);
|
||
if (tp == NULL || tp->priv == NULL)
|
||
record_thread (info, tp, ptid, th_p, &ti);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Helper for thread_db_find_new_threads_2.
|
||
Returns number of new threads found. */
|
||
|
||
static int
|
||
find_new_threads_once (struct thread_db_info *info, int iteration,
|
||
td_err_e *errp)
|
||
{
|
||
struct callback_data data;
|
||
td_err_e err = TD_ERR;
|
||
|
||
data.info = info;
|
||
data.new_threads = 0;
|
||
|
||
/* See comment in thread_db_update_thread_list. */
|
||
gdb_assert (info->td_ta_thr_iter_p != NULL);
|
||
|
||
try
|
||
{
|
||
/* Iterate over all user-space threads to discover new threads. */
|
||
err = info->td_ta_thr_iter_p (info->thread_agent,
|
||
find_new_threads_callback,
|
||
&data,
|
||
TD_THR_ANY_STATE,
|
||
TD_THR_LOWEST_PRIORITY,
|
||
TD_SIGNO_MASK,
|
||
TD_THR_ANY_USER_FLAGS);
|
||
}
|
||
catch (const gdb_exception_error &except)
|
||
{
|
||
if (libthread_db_debug)
|
||
{
|
||
exception_fprintf (gdb_stdlog, except,
|
||
"Warning: find_new_threads_once: ");
|
||
}
|
||
}
|
||
|
||
if (libthread_db_debug)
|
||
{
|
||
fprintf_unfiltered (gdb_stdlog,
|
||
_("Found %d new threads in iteration %d.\n"),
|
||
data.new_threads, iteration);
|
||
}
|
||
|
||
if (errp != NULL)
|
||
*errp = err;
|
||
|
||
return data.new_threads;
|
||
}
|
||
|
||
/* Search for new threads, accessing memory through stopped thread
|
||
PTID. If UNTIL_NO_NEW is true, repeat searching until several
|
||
searches in a row do not discover any new threads. */
|
||
|
||
static void
|
||
thread_db_find_new_threads_2 (thread_info *stopped, bool until_no_new)
|
||
{
|
||
td_err_e err = TD_OK;
|
||
struct thread_db_info *info;
|
||
int i, loop;
|
||
|
||
info = get_thread_db_info (stopped->inf->process_target (),
|
||
stopped->ptid.pid ());
|
||
|
||
/* Access an lwp we know is stopped. */
|
||
info->proc_handle.thread = stopped;
|
||
|
||
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. */
|
||
for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop)
|
||
if (find_new_threads_once (info, i, &err) != 0)
|
||
{
|
||
/* Found some new threads. Restart the loop from beginning. */
|
||
loop = -1;
|
||
}
|
||
}
|
||
else
|
||
find_new_threads_once (info, 0, &err);
|
||
|
||
if (err != TD_OK)
|
||
error (_("Cannot find new threads: %s"), thread_db_err_str (err));
|
||
}
|
||
|
||
static void
|
||
thread_db_find_new_threads_1 (thread_info *stopped)
|
||
{
|
||
thread_db_find_new_threads_2 (stopped, 0);
|
||
}
|
||
|
||
/* Implement the to_update_thread_list target method for this
|
||
target. */
|
||
|
||
void
|
||
thread_db_target::update_thread_list ()
|
||
{
|
||
struct thread_db_info *info;
|
||
|
||
prune_threads ();
|
||
|
||
for (inferior *inf : all_inferiors ())
|
||
{
|
||
if (inf->pid == 0)
|
||
continue;
|
||
|
||
info = get_thread_db_info (inf->process_target (), inf->pid);
|
||
if (info == NULL)
|
||
continue;
|
||
|
||
thread_info *thread = any_live_thread_of_inferior (inf);
|
||
if (thread == NULL || thread->executing)
|
||
continue;
|
||
|
||
/* It's best to avoid td_ta_thr_iter if possible. That walks
|
||
data structures in the inferior's address space that may be
|
||
corrupted, or, if the target is running, the list may change
|
||
while we walk it. In the latter case, it's possible that a
|
||
thread exits just at the exact time that causes GDB to get
|
||
stuck in an infinite loop. To avoid pausing all threads
|
||
whenever the core wants to refresh the thread list, we
|
||
instead use thread_from_lwp immediately when we see an LWP
|
||
stop. That uses thread_db entry points that do not walk
|
||
libpthread's thread list, so should be safe, as well as more
|
||
efficient. */
|
||
if (thread->inf->has_execution ())
|
||
continue;
|
||
|
||
thread_db_find_new_threads_1 (thread);
|
||
}
|
||
|
||
/* Give the beneath target a chance to do extra processing. */
|
||
this->beneath ()->update_thread_list ();
|
||
}
|
||
|
||
std::string
|
||
thread_db_target::pid_to_str (ptid_t ptid)
|
||
{
|
||
thread_info *thread_info = find_thread_ptid (current_inferior (), ptid);
|
||
|
||
if (thread_info != NULL && thread_info->priv != NULL)
|
||
{
|
||
thread_db_thread_info *priv = get_thread_db_thread_info (thread_info);
|
||
|
||
return string_printf ("Thread 0x%lx (LWP %ld)",
|
||
(unsigned long) priv->tid, ptid.lwp ());
|
||
}
|
||
|
||
return beneath ()->pid_to_str (ptid);
|
||
}
|
||
|
||
/* Return a string describing the state of the thread specified by
|
||
INFO. */
|
||
|
||
const char *
|
||
thread_db_target::extra_thread_info (thread_info *info)
|
||
{
|
||
if (info->priv == NULL)
|
||
return NULL;
|
||
|
||
thread_db_thread_info *priv = get_thread_db_thread_info (info);
|
||
|
||
if (priv->dying)
|
||
return "Exiting";
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Return pointer to the thread_info struct which corresponds to
|
||
THREAD_HANDLE (having length HANDLE_LEN). */
|
||
|
||
thread_info *
|
||
thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle,
|
||
int handle_len,
|
||
inferior *inf)
|
||
{
|
||
thread_t handle_tid;
|
||
|
||
/* When debugging a 32-bit target from a 64-bit host, handle_len
|
||
will be 4 and sizeof (handle_tid) will be 8. This requires
|
||
a different cast than the more straightforward case where
|
||
the sizes are the same.
|
||
|
||
Use "--target_board unix/-m32" from a native x86_64 linux build
|
||
to test the 32/64-bit case. */
|
||
if (handle_len == 4 && sizeof (handle_tid) == 8)
|
||
handle_tid = (thread_t) * (const uint32_t *) thread_handle;
|
||
else if (handle_len == sizeof (handle_tid))
|
||
handle_tid = * (const thread_t *) thread_handle;
|
||
else
|
||
error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"),
|
||
handle_len, sizeof (handle_tid));
|
||
|
||
for (thread_info *tp : inf->non_exited_threads ())
|
||
{
|
||
thread_db_thread_info *priv = get_thread_db_thread_info (tp);
|
||
|
||
if (priv != NULL && handle_tid == priv->tid)
|
||
return tp;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Return the thread handle associated the thread_info pointer TP. */
|
||
|
||
gdb::byte_vector
|
||
thread_db_target::thread_info_to_thread_handle (struct thread_info *tp)
|
||
{
|
||
thread_db_thread_info *priv = get_thread_db_thread_info (tp);
|
||
|
||
if (priv == NULL)
|
||
return gdb::byte_vector ();
|
||
|
||
int handle_size = sizeof (priv->tid);
|
||
gdb::byte_vector rv (handle_size);
|
||
|
||
memcpy (rv.data (), &priv->tid, handle_size);
|
||
|
||
return rv;
|
||
}
|
||
|
||
/* Get the address of the thread local variable in load module LM which
|
||
is stored at OFFSET within the thread local storage for thread PTID. */
|
||
|
||
CORE_ADDR
|
||
thread_db_target::get_thread_local_address (ptid_t ptid,
|
||
CORE_ADDR lm,
|
||
CORE_ADDR offset)
|
||
{
|
||
struct thread_info *thread_info;
|
||
process_stratum_target *beneath
|
||
= as_process_stratum_target (this->beneath ());
|
||
/* Find the matching thread. */
|
||
thread_info = find_thread_ptid (beneath, ptid);
|
||
|
||
/* We may not have discovered the thread yet. */
|
||
if (thread_info != NULL && thread_info->priv == NULL)
|
||
thread_info = thread_from_lwp (thread_info, ptid);
|
||
|
||
if (thread_info != NULL && thread_info->priv != NULL)
|
||
{
|
||
td_err_e err;
|
||
psaddr_t address;
|
||
thread_db_info *info = get_thread_db_info (beneath, ptid.pid ());
|
||
thread_db_thread_info *priv = get_thread_db_thread_info (thread_info);
|
||
|
||
/* Finally, get the address of the variable. */
|
||
if (lm != 0)
|
||
{
|
||
/* glibc doesn't provide the needed interface. */
|
||
if (!info->td_thr_tls_get_addr_p)
|
||
throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
|
||
_("No TLS library support"));
|
||
|
||
/* Note the cast through uintptr_t: this interface only works if
|
||
a target address fits in a psaddr_t, which is a host pointer.
|
||
So a 32-bit debugger can not access 64-bit TLS through this. */
|
||
err = info->td_thr_tls_get_addr_p (&priv->th,
|
||
(psaddr_t)(uintptr_t) lm,
|
||
offset, &address);
|
||
}
|
||
else
|
||
{
|
||
/* If glibc doesn't provide the needed interface throw an error
|
||
that LM is zero - normally cases it should not be. */
|
||
if (!info->td_thr_tlsbase_p)
|
||
throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR,
|
||
_("TLS load module not found"));
|
||
|
||
/* This code path handles the case of -static -pthread executables:
|
||
https://sourceware.org/ml/libc-help/2014-03/msg00024.html
|
||
For older GNU libc r_debug.r_map is NULL. For GNU libc after
|
||
PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL.
|
||
The constant number 1 depends on GNU __libc_setup_tls
|
||
initialization of l_tls_modid to 1. */
|
||
err = info->td_thr_tlsbase_p (&priv->th, 1, &address);
|
||
address = (char *) address + offset;
|
||
}
|
||
|
||
#ifdef THREAD_DB_HAS_TD_NOTALLOC
|
||
/* The memory hasn't been allocated, yet. */
|
||
if (err == TD_NOTALLOC)
|
||
/* Now, if libthread_db provided the initialization image's
|
||
address, we *could* try to build a non-lvalue value from
|
||
the initialization image. */
|
||
throw_error (TLS_NOT_ALLOCATED_YET_ERROR,
|
||
_("TLS not allocated yet"));
|
||
#endif
|
||
|
||
/* Something else went wrong. */
|
||
if (err != TD_OK)
|
||
throw_error (TLS_GENERIC_ERROR,
|
||
(("%s")), thread_db_err_str (err));
|
||
|
||
/* Cast assuming host == target. Joy. */
|
||
/* Do proper sign extension for the target. */
|
||
gdb_assert (exec_bfd);
|
||
return (bfd_get_sign_extend_vma (exec_bfd) > 0
|
||
? (CORE_ADDR) (intptr_t) address
|
||
: (CORE_ADDR) (uintptr_t) address);
|
||
}
|
||
|
||
return beneath->get_thread_local_address (ptid, lm, offset);
|
||
}
|
||
|
||
/* Implement the to_get_ada_task_ptid target method for this target. */
|
||
|
||
ptid_t
|
||
thread_db_target::get_ada_task_ptid (long lwp, long thread)
|
||
{
|
||
/* NPTL uses a 1:1 model, so the LWP id suffices. */
|
||
return ptid_t (inferior_ptid.pid (), lwp, 0);
|
||
}
|
||
|
||
void
|
||
thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
|
||
{
|
||
process_stratum_target *beneath
|
||
= as_process_stratum_target (this->beneath ());
|
||
|
||
thread_db_info *info
|
||
= get_thread_db_info (beneath, (ptid == minus_one_ptid
|
||
? inferior_ptid.pid ()
|
||
: ptid.pid ()));
|
||
|
||
/* This workaround is only needed for child fork lwps stopped in a
|
||
PTRACE_O_TRACEFORK event. When the inferior is resumed, the
|
||
workaround can be disabled. */
|
||
if (info)
|
||
info->need_stale_parent_threads_check = 0;
|
||
|
||
beneath->resume (ptid, step, signo);
|
||
}
|
||
|
||
/* std::sort helper function for info_auto_load_libthread_db, sort the
|
||
thread_db_info pointers primarily by their FILENAME and secondarily by their
|
||
PID, both in ascending order. */
|
||
|
||
static bool
|
||
info_auto_load_libthread_db_compare (const struct thread_db_info *a,
|
||
const struct thread_db_info *b)
|
||
{
|
||
int retval;
|
||
|
||
retval = strcmp (a->filename, b->filename);
|
||
if (retval)
|
||
return retval < 0;
|
||
|
||
return a->pid < b->pid;
|
||
}
|
||
|
||
/* Implement 'info auto-load libthread-db'. */
|
||
|
||
static void
|
||
info_auto_load_libthread_db (const char *args, int from_tty)
|
||
{
|
||
struct ui_out *uiout = current_uiout;
|
||
const char *cs = args ? args : "";
|
||
struct thread_db_info *info;
|
||
unsigned unique_filenames;
|
||
size_t max_filename_len, pids_len;
|
||
int i;
|
||
|
||
cs = skip_spaces (cs);
|
||
if (*cs)
|
||
error (_("'info auto-load libthread-db' does not accept any parameters"));
|
||
|
||
std::vector<struct thread_db_info *> array;
|
||
for (info = thread_db_list; info; info = info->next)
|
||
if (info->filename != NULL)
|
||
array.push_back (info);
|
||
|
||
/* Sort ARRAY by filenames and PIDs. */
|
||
std::sort (array.begin (), array.end (),
|
||
info_auto_load_libthread_db_compare);
|
||
|
||
/* Calculate the number of unique filenames (rows) and the maximum string
|
||
length of PIDs list for the unique filenames (columns). */
|
||
|
||
unique_filenames = 0;
|
||
max_filename_len = 0;
|
||
pids_len = 0;
|
||
for (i = 0; i < array.size (); i++)
|
||
{
|
||
int pid = array[i]->pid;
|
||
size_t this_pid_len;
|
||
|
||
for (this_pid_len = 0; pid != 0; pid /= 10)
|
||
this_pid_len++;
|
||
|
||
if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0)
|
||
{
|
||
unique_filenames++;
|
||
max_filename_len = std::max (max_filename_len,
|
||
strlen (array[i]->filename));
|
||
|
||
if (i > 0)
|
||
pids_len -= strlen (", ");
|
||
pids_len = 0;
|
||
}
|
||
pids_len += this_pid_len + strlen (", ");
|
||
}
|
||
if (i)
|
||
pids_len -= strlen (", ");
|
||
|
||
/* Table header shifted right by preceding "libthread-db: " would not match
|
||
its columns. */
|
||
if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl)
|
||
uiout->text ("\n");
|
||
|
||
{
|
||
ui_out_emit_table table_emitter (uiout, 2, unique_filenames,
|
||
"LinuxThreadDbTable");
|
||
|
||
uiout->table_header (max_filename_len, ui_left, "filename", "Filename");
|
||
uiout->table_header (pids_len, ui_left, "PIDs", "Pids");
|
||
uiout->table_body ();
|
||
|
||
/* Note I is incremented inside the cycle, not at its end. */
|
||
for (i = 0; i < array.size ();)
|
||
{
|
||
ui_out_emit_tuple tuple_emitter (uiout, NULL);
|
||
|
||
info = array[i];
|
||
uiout->field_string ("filename", info->filename);
|
||
|
||
std::string pids;
|
||
while (i < array.size () && strcmp (info->filename,
|
||
array[i]->filename) == 0)
|
||
{
|
||
if (!pids.empty ())
|
||
pids += ", ";
|
||
string_appendf (pids, "%u", array[i]->pid);
|
||
i++;
|
||
}
|
||
|
||
uiout->field_string ("pids", pids.c_str ());
|
||
|
||
uiout->text ("\n");
|
||
}
|
||
}
|
||
|
||
if (array.empty ())
|
||
uiout->message (_("No auto-loaded libthread-db.\n"));
|
||
}
|
||
|
||
/* Implement 'maintenance check libthread-db'. */
|
||
|
||
static void
|
||
maintenance_check_libthread_db (const char *args, int from_tty)
|
||
{
|
||
int inferior_pid = inferior_ptid.pid ();
|
||
struct thread_db_info *info;
|
||
|
||
if (inferior_pid == 0)
|
||
error (_("No inferior running"));
|
||
|
||
info = get_thread_db_info (current_inferior ()->process_target (),
|
||
inferior_pid);
|
||
if (info == NULL)
|
||
error (_("No libthread_db loaded"));
|
||
|
||
check_thread_db (info, true);
|
||
}
|
||
|
||
void _initialize_thread_db ();
|
||
void
|
||
_initialize_thread_db ()
|
||
{
|
||
/* Defer loading of libthread_db.so until inferior is running.
|
||
This allows gdb to load correct libthread_db for a given
|
||
executable -- there could be multiple versions of glibc,
|
||
and until there is a running inferior, we can't tell which
|
||
libthread_db is the correct one to load. */
|
||
|
||
libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
|
||
|
||
add_setshow_optional_filename_cmd ("libthread-db-search-path",
|
||
class_support,
|
||
&libthread_db_search_path, _("\
|
||
Set search path for libthread_db."), _("\
|
||
Show the current search path or libthread_db."), _("\
|
||
This path is used to search for libthread_db to be loaded into \
|
||
gdb itself.\n\
|
||
Its value is a colon (':') separate list of directories to search.\n\
|
||
Setting the search path to an empty list resets it to its default value."),
|
||
set_libthread_db_search_path,
|
||
NULL,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_zuinteger_cmd ("libthread-db", class_maintenance,
|
||
&libthread_db_debug, _("\
|
||
Set libthread-db debugging."), _("\
|
||
Show libthread-db debugging."), _("\
|
||
When non-zero, libthread-db debugging is enabled."),
|
||
NULL,
|
||
show_libthread_db_debug,
|
||
&setdebuglist, &showdebuglist);
|
||
|
||
add_setshow_boolean_cmd ("libthread-db", class_support,
|
||
&auto_load_thread_db, _("\
|
||
Enable or disable auto-loading of inferior specific libthread_db."), _("\
|
||
Show whether auto-loading inferior specific libthread_db is enabled."), _("\
|
||
If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\
|
||
locations to load libthread_db compatible with the inferior.\n\
|
||
Standard system libthread_db still gets loaded even with this option off.\n\
|
||
This option has security implications for untrusted inferiors."),
|
||
NULL, show_auto_load_thread_db,
|
||
auto_load_set_cmdlist_get (),
|
||
auto_load_show_cmdlist_get ());
|
||
|
||
add_cmd ("libthread-db", class_info, info_auto_load_libthread_db,
|
||
_("Print the list of loaded inferior specific libthread_db.\n\
|
||
Usage: info auto-load libthread-db"),
|
||
auto_load_info_cmdlist_get ());
|
||
|
||
add_cmd ("libthread-db", class_maintenance,
|
||
maintenance_check_libthread_db, _("\
|
||
Run integrity checks on the current inferior's libthread_db."),
|
||
&maintenancechecklist);
|
||
|
||
add_setshow_boolean_cmd ("check-libthread-db",
|
||
class_maintenance,
|
||
&check_thread_db_on_load, _("\
|
||
Set whether to check libthread_db at load time."), _("\
|
||
Show whether to check libthread_db at load time."), _("\
|
||
If enabled GDB will run integrity checks on inferior specific libthread_db\n\
|
||
as they are loaded."),
|
||
NULL,
|
||
NULL,
|
||
&maintenance_set_cmdlist,
|
||
&maintenance_show_cmdlist);
|
||
|
||
/* Add ourselves to objfile event chain. */
|
||
gdb::observers::new_objfile.attach (thread_db_new_objfile);
|
||
|
||
/* Add ourselves to inferior_created event chain.
|
||
This is needed to handle debugging statically linked programs where
|
||
the new_objfile observer won't get called for libpthread. */
|
||
gdb::observers::inferior_created.attach (thread_db_inferior_created);
|
||
}
|