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- /* Target operations for the remote server for GDB.
- Copyright (C) 2002-2022 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);
- switch_to_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;
- }
- switch_to_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->set_stopped (GDB_SIGNAL_0);
- /* 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->exit_status ());
- else if (ourstatus->kind () == TARGET_WAITKIND_SIGNALLED)
- fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n",
- gdb_signal_to_host (ourstatus->sig ()),
- gdb_signal_to_name (ourstatus->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. */
- std::string
- target_pid_to_str (ptid_t ptid)
- {
- if (ptid == minus_one_ptid)
- return string_printf("<all threads>");
- else if (ptid == null_ptid)
- return string_printf("<null thread>");
- else if (ptid.tid () != 0)
- return string_printf("Thread %d.0x%s",
- ptid.pid (),
- phex_nz (ptid.tid (), sizeof (ULONGEST)));
- else if (ptid.lwp () != 0)
- return string_printf("LWP %d.%ld",
- ptid.pid (), ptid.lwp ());
- else
- return string_printf("Process %d",
- ptid.pid ());
- }
- 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 (thread_info *tp,
- 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;
- }
- thread_info *
- process_stratum_target::thread_pending_parent (thread_info *thread)
- {
- return nullptr;
- }
- thread_info *
- process_stratum_target::thread_pending_child (thread_info *thread)
- {
- return nullptr;
- }
- 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;
- }
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