| /* Target operations for the remote server for GDB. |
| Copyright (C) 2002-2021 Free Software Foundation, Inc. |
| |
| Contributed by MontaVista Software. |
| |
| 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 "server.h" |
| #include "tracepoint.h" |
| #include "gdbsupport/byte-vector.h" |
| #include "hostio.h" |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| |
| process_stratum_target *the_target; |
| |
| int |
| set_desired_thread () |
| { |
| client_state &cs = get_client_state (); |
| thread_info *found = find_thread_ptid (cs.general_thread); |
| |
| current_thread = found; |
| return (current_thread != NULL); |
| } |
| |
| /* The thread that was current before prepare_to_access_memory was |
| called. done_accessing_memory uses this to restore the previous |
| selected thread. */ |
| static ptid_t prev_general_thread; |
| |
| /* See target.h. */ |
| |
| int |
| prepare_to_access_memory (void) |
| { |
| client_state &cs = get_client_state (); |
| |
| /* The first thread found. */ |
| struct thread_info *first = NULL; |
| /* The first stopped thread found. */ |
| struct thread_info *stopped = NULL; |
| /* The current general thread, if found. */ |
| struct thread_info *current = NULL; |
| |
| /* Save the general thread value, since prepare_to_access_memory could change |
| it. */ |
| prev_general_thread = cs.general_thread; |
| |
| int res = the_target->prepare_to_access_memory (); |
| if (res != 0) |
| return res; |
| |
| for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread) |
| { |
| if (mythread_alive (thread->id)) |
| { |
| if (stopped == NULL && the_target->supports_thread_stopped () |
| && target_thread_stopped (thread)) |
| stopped = thread; |
| |
| if (first == NULL) |
| first = thread; |
| |
| if (current == NULL && prev_general_thread == thread->id) |
| current = thread; |
| } |
| }); |
| |
| /* The thread we end up choosing. */ |
| struct thread_info *thread; |
| |
| /* Prefer a stopped thread. If none is found, try the current |
| thread. Otherwise, take the first thread in the process. If |
| none is found, undo the effects of |
| target->prepare_to_access_memory() and return error. */ |
| if (stopped != NULL) |
| thread = stopped; |
| else if (current != NULL) |
| thread = current; |
| else if (first != NULL) |
| thread = first; |
| else |
| { |
| done_accessing_memory (); |
| return 1; |
| } |
| |
| current_thread = thread; |
| cs.general_thread = ptid_of (thread); |
| |
| return 0; |
| } |
| |
| /* See target.h. */ |
| |
| void |
| done_accessing_memory (void) |
| { |
| client_state &cs = get_client_state (); |
| |
| the_target->done_accessing_memory (); |
| |
| /* Restore the previous selected thread. */ |
| cs.general_thread = prev_general_thread; |
| switch_to_thread (the_target, cs.general_thread); |
| } |
| |
| int |
| read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
| { |
| int res; |
| res = the_target->read_memory (memaddr, myaddr, len); |
| check_mem_read (memaddr, myaddr, len); |
| return res; |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| return read_inferior_memory (memaddr, myaddr, len); |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) |
| { |
| return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
| ssize_t len) |
| { |
| /* Make a copy of the data because check_mem_write may need to |
| update it. */ |
| gdb::byte_vector buffer (myaddr, myaddr + len); |
| check_mem_write (memaddr, buffer.data (), myaddr, len); |
| return the_target->write_memory (memaddr, buffer.data (), len); |
| } |
| |
| ptid_t |
| mywait (ptid_t ptid, struct target_waitstatus *ourstatus, |
| target_wait_flags options, int connected_wait) |
| { |
| ptid_t ret; |
| |
| if (connected_wait) |
| server_waiting = 1; |
| |
| ret = target_wait (ptid, ourstatus, options); |
| |
| /* We don't expose _LOADED events to gdbserver core. See the |
| `dlls_changed' global. */ |
| if (ourstatus->kind == TARGET_WAITKIND_LOADED) |
| ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| |
| /* If GDB is connected through TCP/serial, then GDBserver will most |
| probably be running on its own terminal/console, so it's nice to |
| print there why is GDBserver exiting. If however, GDB is |
| connected through stdio, then there's no need to spam the GDB |
| console with this -- the user will already see the exit through |
| regular GDB output, in that same terminal. */ |
| if (!remote_connection_is_stdio ()) |
| { |
| if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
| fprintf (stderr, |
| "\nChild exited with status %d\n", ourstatus->value.integer); |
| else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
| fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", |
| gdb_signal_to_host (ourstatus->value.sig), |
| gdb_signal_to_name (ourstatus->value.sig)); |
| } |
| |
| if (connected_wait) |
| server_waiting = 0; |
| |
| return ret; |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_stop_and_wait (ptid_t ptid) |
| { |
| struct target_waitstatus status; |
| bool was_non_stop = non_stop; |
| struct thread_resume resume_info; |
| |
| resume_info.thread = ptid; |
| resume_info.kind = resume_stop; |
| resume_info.sig = GDB_SIGNAL_0; |
| the_target->resume (&resume_info, 1); |
| |
| non_stop = true; |
| mywait (ptid, &status, 0, 0); |
| non_stop = was_non_stop; |
| } |
| |
| /* See target/target.h. */ |
| |
| ptid_t |
| target_wait (ptid_t ptid, struct target_waitstatus *status, |
| target_wait_flags options) |
| { |
| return the_target->wait (ptid, status, options); |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_mourn_inferior (ptid_t ptid) |
| { |
| the_target->mourn (find_process_pid (ptid.pid ())); |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_continue_no_signal (ptid_t ptid) |
| { |
| struct thread_resume resume_info; |
| |
| resume_info.thread = ptid; |
| resume_info.kind = resume_continue; |
| resume_info.sig = GDB_SIGNAL_0; |
| the_target->resume (&resume_info, 1); |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_continue (ptid_t ptid, enum gdb_signal signal) |
| { |
| struct thread_resume resume_info; |
| |
| resume_info.thread = ptid; |
| resume_info.kind = resume_continue; |
| resume_info.sig = gdb_signal_to_host (signal); |
| the_target->resume (&resume_info, 1); |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_supports_multi_process (void) |
| { |
| return the_target->supports_multi_process (); |
| } |
| |
| void |
| set_target_ops (process_stratum_target *target) |
| { |
| the_target = target; |
| } |
| |
| /* Convert pid to printable format. */ |
| |
| const char * |
| target_pid_to_str (ptid_t ptid) |
| { |
| static char buf[80]; |
| |
| if (ptid == minus_one_ptid) |
| xsnprintf (buf, sizeof (buf), "<all threads>"); |
| else if (ptid == null_ptid) |
| xsnprintf (buf, sizeof (buf), "<null thread>"); |
| else if (ptid.tid () != 0) |
| xsnprintf (buf, sizeof (buf), "Thread %d.0x%s", |
| ptid.pid (), phex_nz (ptid.tid (), sizeof (ULONGEST))); |
| else if (ptid.lwp () != 0) |
| xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
| ptid.pid (), ptid.lwp ()); |
| else |
| xsnprintf (buf, sizeof (buf), "Process %d", |
| ptid.pid ()); |
| |
| return buf; |
| } |
| |
| int |
| kill_inferior (process_info *proc) |
| { |
| gdb_agent_about_to_close (proc->pid); |
| |
| return the_target->kill (proc); |
| } |
| |
| /* Define it. */ |
| |
| target_terminal_state target_terminal::m_terminal_state |
| = target_terminal_state::is_ours; |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::init () |
| { |
| /* Placeholder needed because of fork_inferior. Not necessary on |
| GDBserver. */ |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::inferior () |
| { |
| /* Placeholder needed because of fork_inferior. Not necessary on |
| GDBserver. */ |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::ours () |
| { |
| /* Placeholder needed because of fork_inferior. Not necessary on |
| GDBserver. */ |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::ours_for_output (void) |
| { |
| /* Placeholder. */ |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::info (const char *arg, int from_tty) |
| { |
| /* Placeholder. */ |
| } |
| |
| /* Default implementations of target ops. |
| See target.h for definitions. */ |
| |
| void |
| process_stratum_target::post_create_inferior () |
| { |
| /* Nop. */ |
| } |
| |
| int |
| process_stratum_target::prepare_to_access_memory () |
| { |
| return 0; |
| } |
| |
| void |
| process_stratum_target::done_accessing_memory () |
| { |
| /* Nop. */ |
| } |
| |
| void |
| process_stratum_target::look_up_symbols () |
| { |
| /* Nop. */ |
| } |
| |
| bool |
| process_stratum_target::supports_read_auxv () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, |
| unsigned int len) |
| { |
| gdb_assert_not_reached ("target op read_auxv not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_z_point_type (char z_type) |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::insert_point (enum raw_bkpt_type type, |
| CORE_ADDR addr, |
| int size, raw_breakpoint *bp) |
| { |
| return 1; |
| } |
| |
| int |
| process_stratum_target::remove_point (enum raw_bkpt_type type, |
| CORE_ADDR addr, |
| int size, raw_breakpoint *bp) |
| { |
| return 1; |
| } |
| |
| bool |
| process_stratum_target::stopped_by_sw_breakpoint () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_stopped_by_sw_breakpoint () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::stopped_by_hw_breakpoint () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_stopped_by_hw_breakpoint () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_hardware_single_step () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::stopped_by_watchpoint () |
| { |
| return false; |
| } |
| |
| CORE_ADDR |
| process_stratum_target::stopped_data_address () |
| { |
| return 0; |
| } |
| |
| bool |
| process_stratum_target::supports_read_offsets () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_memory_tagging () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::fetch_memtags (CORE_ADDR address, size_t len, |
| gdb::byte_vector &tags, int type) |
| { |
| gdb_assert_not_reached ("target op fetch_memtags not supported"); |
| } |
| |
| bool |
| process_stratum_target::store_memtags (CORE_ADDR address, size_t len, |
| const gdb::byte_vector &tags, int type) |
| { |
| gdb_assert_not_reached ("target op store_memtags not supported"); |
| } |
| |
| int |
| process_stratum_target::read_offsets (CORE_ADDR *text, CORE_ADDR *data) |
| { |
| gdb_assert_not_reached ("target op read_offsets not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_get_tls_address () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::get_tls_address (thread_info *thread, |
| CORE_ADDR offset, |
| CORE_ADDR load_module, |
| CORE_ADDR *address) |
| { |
| gdb_assert_not_reached ("target op get_tls_address not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_qxfer_osdata () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::qxfer_osdata (const char *annex, |
| unsigned char *readbuf, |
| unsigned const char *writebuf, |
| CORE_ADDR offset, int len) |
| { |
| gdb_assert_not_reached ("target op qxfer_osdata not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_qxfer_siginfo () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::qxfer_siginfo (const char *annex, |
| unsigned char *readbuf, |
| unsigned const char *writebuf, |
| CORE_ADDR offset, int len) |
| { |
| gdb_assert_not_reached ("target op qxfer_siginfo not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_non_stop () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::async (bool enable) |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::start_non_stop (bool enable) |
| { |
| if (enable) |
| return -1; |
| else |
| return 0; |
| } |
| |
| bool |
| process_stratum_target::supports_multi_process () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_fork_events () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_vfork_events () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_exec_events () |
| { |
| return false; |
| } |
| |
| void |
| process_stratum_target::handle_new_gdb_connection () |
| { |
| /* Nop. */ |
| } |
| |
| int |
| process_stratum_target::handle_monitor_command (char *mon) |
| { |
| return 0; |
| } |
| |
| int |
| process_stratum_target::core_of_thread (ptid_t ptid) |
| { |
| return -1; |
| } |
| |
| bool |
| process_stratum_target::supports_read_loadmap () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::read_loadmap (const char *annex, |
| CORE_ADDR offset, |
| unsigned char *myaddr, |
| unsigned int len) |
| { |
| gdb_assert_not_reached ("target op read_loadmap not supported"); |
| } |
| |
| void |
| process_stratum_target::process_qsupported |
| (gdb::array_view<const char * const> features) |
| { |
| /* Nop. */ |
| } |
| |
| bool |
| process_stratum_target::supports_tracepoints () |
| { |
| return false; |
| } |
| |
| CORE_ADDR |
| process_stratum_target::read_pc (regcache *regcache) |
| { |
| gdb_assert_not_reached ("process_target::read_pc: Unable to find PC"); |
| } |
| |
| void |
| process_stratum_target::write_pc (regcache *regcache, CORE_ADDR pc) |
| { |
| gdb_assert_not_reached ("process_target::write_pc: Unable to update PC"); |
| } |
| |
| bool |
| process_stratum_target::supports_thread_stopped () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::thread_stopped (thread_info *thread) |
| { |
| gdb_assert_not_reached ("target op thread_stopped not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_get_tib_address () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::get_tib_address (ptid_t ptid, CORE_ADDR *address) |
| { |
| gdb_assert_not_reached ("target op get_tib_address not supported"); |
| } |
| |
| void |
| process_stratum_target::pause_all (bool freeze) |
| { |
| /* Nop. */ |
| } |
| |
| void |
| process_stratum_target::unpause_all (bool unfreeze) |
| { |
| /* Nop. */ |
| } |
| |
| void |
| process_stratum_target::stabilize_threads () |
| { |
| /* Nop. */ |
| } |
| |
| bool |
| process_stratum_target::supports_fast_tracepoints () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::install_fast_tracepoint_jump_pad |
| (CORE_ADDR tpoint, CORE_ADDR tpaddr, CORE_ADDR collector, |
| CORE_ADDR lockaddr, ULONGEST orig_size, CORE_ADDR *jump_entry, |
| CORE_ADDR *trampoline, ULONGEST *trampoline_size, |
| unsigned char *jjump_pad_insn, ULONGEST *jjump_pad_insn_size, |
| CORE_ADDR *adjusted_insn_addr, CORE_ADDR *adjusted_insn_addr_end, |
| char *err) |
| { |
| gdb_assert_not_reached ("target op install_fast_tracepoint_jump_pad " |
| "not supported"); |
| } |
| |
| int |
| process_stratum_target::get_min_fast_tracepoint_insn_len () |
| { |
| return 0; |
| } |
| |
| struct emit_ops * |
| process_stratum_target::emit_ops () |
| { |
| return nullptr; |
| } |
| |
| bool |
| process_stratum_target::supports_disable_randomization () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_qxfer_libraries_svr4 () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::qxfer_libraries_svr4 (const char *annex, |
| unsigned char *readbuf, |
| unsigned const char *writebuf, |
| CORE_ADDR offset, int len) |
| { |
| gdb_assert_not_reached ("target op qxfer_libraries_svr4 not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_agent () |
| { |
| return false; |
| } |
| |
| btrace_target_info * |
| process_stratum_target::enable_btrace (ptid_t ptid, const btrace_config *conf) |
| { |
| error (_("Target does not support branch tracing.")); |
| } |
| |
| int |
| process_stratum_target::disable_btrace (btrace_target_info *tinfo) |
| { |
| error (_("Target does not support branch tracing.")); |
| } |
| |
| int |
| process_stratum_target::read_btrace (btrace_target_info *tinfo, |
| buffer *buffer, |
| enum btrace_read_type type) |
| { |
| error (_("Target does not support branch tracing.")); |
| } |
| |
| int |
| process_stratum_target::read_btrace_conf (const btrace_target_info *tinfo, |
| buffer *buffer) |
| { |
| error (_("Target does not support branch tracing.")); |
| } |
| |
| bool |
| process_stratum_target::supports_range_stepping () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_pid_to_exec_file () |
| { |
| return false; |
| } |
| |
| const char * |
| process_stratum_target::pid_to_exec_file (int pid) |
| { |
| gdb_assert_not_reached ("target op pid_to_exec_file not supported"); |
| } |
| |
| bool |
| process_stratum_target::supports_multifs () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::multifs_open (int pid, const char *filename, |
| int flags, mode_t mode) |
| { |
| return open (filename, flags, mode); |
| } |
| |
| int |
| process_stratum_target::multifs_unlink (int pid, const char *filename) |
| { |
| return unlink (filename); |
| } |
| |
| ssize_t |
| process_stratum_target::multifs_readlink (int pid, const char *filename, |
| char *buf, size_t bufsiz) |
| { |
| return readlink (filename, buf, bufsiz); |
| } |
| |
| int |
| process_stratum_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr) |
| { |
| /* The default behavior is to use the size of a breakpoint as the |
| kind. */ |
| int size = 0; |
| sw_breakpoint_from_kind (0, &size); |
| return size; |
| } |
| |
| int |
| process_stratum_target::breakpoint_kind_from_current_state (CORE_ADDR *pcptr) |
| { |
| return breakpoint_kind_from_pc (pcptr); |
| } |
| |
| const char * |
| process_stratum_target::thread_name (ptid_t thread) |
| { |
| return nullptr; |
| } |
| |
| bool |
| process_stratum_target::thread_handle (ptid_t ptid, gdb_byte **handle, |
| int *handle_len) |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_software_single_step () |
| { |
| return false; |
| } |
| |
| bool |
| process_stratum_target::supports_catch_syscall () |
| { |
| return false; |
| } |
| |
| int |
| process_stratum_target::get_ipa_tdesc_idx () |
| { |
| return 0; |
| } |