| /* Select target systems and architectures at runtime for GDB. |
| |
| Copyright (C) 1990-2024 Free Software Foundation, Inc. |
| |
| Contributed by Cygnus Support. |
| |
| 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 "target.h" |
| #include "extract-store-integer.h" |
| #include "target-dcache.h" |
| #include "cli/cli-cmds.h" |
| #include "symtab.h" |
| #include "inferior.h" |
| #include "infrun.h" |
| #include "observable.h" |
| #include "bfd.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "dcache.h" |
| #include <signal.h> |
| #include "regcache.h" |
| #include "gdbcore.h" |
| #include "target-descriptions.h" |
| #include "gdbthread.h" |
| #include "solib.h" |
| #include "exec.h" |
| #include "inline-frame.h" |
| #include "tracepoint.h" |
| #include "gdbsupport/fileio.h" |
| #include "gdbsupport/agent.h" |
| #include "auxv.h" |
| #include "target-debug.h" |
| #include "ui.h" |
| #include "event-top.h" |
| #include <algorithm> |
| #include "gdbsupport/byte-vector.h" |
| #include "gdbsupport/search.h" |
| #include "terminal.h" |
| #include <unordered_map> |
| #include "target-connection.h" |
| #include "valprint.h" |
| #include "cli/cli-decode.h" |
| #include "cli/cli-style.h" |
| |
| [[noreturn]] static void generic_tls_error (void); |
| |
| static void default_rcmd (struct target_ops *, const char *, struct ui_file *); |
| |
| static int default_verify_memory (struct target_ops *self, |
| const gdb_byte *data, |
| CORE_ADDR memaddr, ULONGEST size); |
| |
| [[noreturn]] static void tcomplain (void); |
| |
| /* Mapping between target_info objects (which have address identity) |
| and corresponding open/factory function/callback. Each add_target |
| call adds one entry to this map, and registers a "target |
| TARGET_NAME" command that when invoked calls the factory registered |
| here. The target_info object is associated with the command via |
| the command's context. */ |
| static std::unordered_map<const target_info *, target_open_ftype *> |
| target_factories; |
| |
| /* The singleton debug target. */ |
| |
| static struct target_ops *the_debug_target; |
| |
| /* Command list for target. */ |
| |
| static struct cmd_list_element *targetlist = NULL; |
| |
| /* See target.h. */ |
| |
| bool trust_readonly = false; |
| |
| /* Nonzero if we should show true memory content including |
| memory breakpoint inserted by gdb. */ |
| |
| static int show_memory_breakpoints = 0; |
| |
| /* These globals control whether GDB attempts to perform these |
| operations; they are useful for targets that need to prevent |
| inadvertent disruption, such as in non-stop mode. */ |
| |
| bool may_write_registers = true; |
| |
| bool may_write_memory = true; |
| |
| bool may_insert_breakpoints = true; |
| |
| bool may_insert_tracepoints = true; |
| |
| bool may_insert_fast_tracepoints = true; |
| |
| bool may_stop = true; |
| |
| /* Non-zero if we want to see trace of target level stuff. */ |
| |
| static unsigned int targetdebug = 0; |
| |
| /* Print a "target" debug statement with the function name prefix. */ |
| |
| #define target_debug_printf(fmt, ...) \ |
| debug_prefixed_printf_cond (targetdebug > 0, "target", fmt, ##__VA_ARGS__) |
| |
| /* Print a "target" debug statement without the function name prefix. */ |
| |
| #define target_debug_printf_nofunc(fmt, ...) \ |
| debug_prefixed_printf_cond_nofunc (targetdebug > 0, "target", fmt, ##__VA_ARGS__) |
| |
| static void |
| set_targetdebug (const char *args, int from_tty, struct cmd_list_element *c) |
| { |
| if (targetdebug) |
| current_inferior ()->push_target (the_debug_target); |
| else |
| current_inferior ()->unpush_target (the_debug_target); |
| } |
| |
| static void |
| show_targetdebug (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| gdb_printf (file, _("Target debugging is %s.\n"), value); |
| } |
| |
| int |
| target_has_memory () |
| { |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| if (t->has_memory ()) |
| return 1; |
| |
| return 0; |
| } |
| |
| int |
| target_has_stack () |
| { |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| if (t->has_stack ()) |
| return 1; |
| |
| return 0; |
| } |
| |
| int |
| target_has_registers () |
| { |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| if (t->has_registers ()) |
| return 1; |
| |
| return 0; |
| } |
| |
| bool |
| target_has_execution (inferior *inf) |
| { |
| if (inf == nullptr) |
| inf = current_inferior (); |
| |
| for (target_ops *t = inf->top_target (); |
| t != nullptr; |
| t = inf->find_target_beneath (t)) |
| if (t->has_execution (inf)) |
| return true; |
| |
| return false; |
| } |
| |
| const char * |
| target_shortname () |
| { |
| return current_inferior ()->top_target ()->shortname (); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_attach_no_wait () |
| { |
| return current_inferior ()->top_target ()->attach_no_wait (); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_post_attach (int pid) |
| { |
| return current_inferior ()->top_target ()->post_attach (pid); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_prepare_to_store (regcache *regcache) |
| { |
| return current_inferior ()->top_target ()->prepare_to_store (regcache); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_supports_enable_disable_tracepoint () |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->supports_enable_disable_tracepoint (); |
| } |
| |
| bool |
| target_supports_string_tracing () |
| { |
| return current_inferior ()->top_target ()->supports_string_tracing (); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_supports_evaluation_of_breakpoint_conditions () |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->supports_evaluation_of_breakpoint_conditions (); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_supports_dumpcore () |
| { |
| return current_inferior ()->top_target ()->supports_dumpcore (); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_dumpcore (const char *filename) |
| { |
| return current_inferior ()->top_target ()->dumpcore (filename); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_can_run_breakpoint_commands () |
| { |
| return current_inferior ()->top_target ()->can_run_breakpoint_commands (); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_files_info () |
| { |
| return current_inferior ()->top_target ()->files_info (); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_insert_fork_catchpoint (int pid) |
| { |
| return current_inferior ()->top_target ()->insert_fork_catchpoint (pid); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_remove_fork_catchpoint (int pid) |
| { |
| return current_inferior ()->top_target ()->remove_fork_catchpoint (pid); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_insert_vfork_catchpoint (int pid) |
| { |
| return current_inferior ()->top_target ()->insert_vfork_catchpoint (pid); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_remove_vfork_catchpoint (int pid) |
| { |
| return current_inferior ()->top_target ()->remove_vfork_catchpoint (pid); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_insert_exec_catchpoint (int pid) |
| { |
| return current_inferior ()->top_target ()->insert_exec_catchpoint (pid); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_remove_exec_catchpoint (int pid) |
| { |
| return current_inferior ()->top_target ()->remove_exec_catchpoint (pid); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_set_syscall_catchpoint (int pid, bool needed, int any_count, |
| gdb::array_view<const int> syscall_counts) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->set_syscall_catchpoint (pid, needed, any_count, |
| syscall_counts); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_rcmd (const char *command, struct ui_file *outbuf) |
| { |
| return current_inferior ()->top_target ()->rcmd (command, outbuf); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_can_lock_scheduler () |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return (target->get_thread_control_capabilities ()& tc_schedlock) != 0; |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_can_async_p () |
| { |
| return target_can_async_p (current_inferior ()->top_target ()); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_can_async_p (struct target_ops *target) |
| { |
| if (!target_async_permitted) |
| return false; |
| return target->can_async_p (); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_is_async_p () |
| { |
| bool result = current_inferior ()->top_target ()->is_async_p (); |
| gdb_assert (target_async_permitted || !result); |
| return result; |
| } |
| |
| exec_direction_kind |
| target_execution_direction () |
| { |
| return current_inferior ()->top_target ()->execution_direction (); |
| } |
| |
| /* See target.h. */ |
| |
| const char * |
| target_extra_thread_info (thread_info *tp) |
| { |
| return current_inferior ()->top_target ()->extra_thread_info (tp); |
| } |
| |
| /* See target.h. */ |
| |
| const char * |
| target_pid_to_exec_file (int pid) |
| { |
| return current_inferior ()->top_target ()->pid_to_exec_file (pid); |
| } |
| |
| /* See target.h. */ |
| |
| gdbarch * |
| target_thread_architecture (ptid_t ptid) |
| { |
| return current_inferior ()->top_target ()->thread_architecture (ptid); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_find_memory_regions (find_memory_region_ftype func, void *data) |
| { |
| return current_inferior ()->top_target ()->find_memory_regions (func, data); |
| } |
| |
| /* See target.h. */ |
| |
| gdb::unique_xmalloc_ptr<char> |
| target_make_corefile_notes (bfd *bfd, int *size_p) |
| { |
| return current_inferior ()->top_target ()->make_corefile_notes (bfd, size_p); |
| } |
| |
| gdb_byte * |
| target_get_bookmark (const char *args, int from_tty) |
| { |
| return current_inferior ()->top_target ()->get_bookmark (args, from_tty); |
| } |
| |
| void |
| target_goto_bookmark (const gdb_byte *arg, int from_tty) |
| { |
| return current_inferior ()->top_target ()->goto_bookmark (arg, from_tty); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_stopped_by_watchpoint () |
| { |
| return current_inferior ()->top_target ()->stopped_by_watchpoint (); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_stopped_by_sw_breakpoint () |
| { |
| return current_inferior ()->top_target ()->stopped_by_sw_breakpoint (); |
| } |
| |
| bool |
| target_supports_stopped_by_sw_breakpoint () |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->supports_stopped_by_sw_breakpoint (); |
| } |
| |
| bool |
| target_stopped_by_hw_breakpoint () |
| { |
| return current_inferior ()->top_target ()->stopped_by_hw_breakpoint (); |
| } |
| |
| bool |
| target_supports_stopped_by_hw_breakpoint () |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->supports_stopped_by_hw_breakpoint (); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_have_steppable_watchpoint () |
| { |
| return current_inferior ()->top_target ()->have_steppable_watchpoint (); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_can_use_hardware_watchpoint (bptype type, int cnt, int othertype) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->can_use_hw_breakpoint (type, cnt, othertype); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->region_ok_for_hw_watchpoint (addr, len); |
| } |
| |
| |
| int |
| target_can_do_single_step () |
| { |
| return current_inferior ()->top_target ()->can_do_single_step (); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_insert_watchpoint (CORE_ADDR addr, int len, target_hw_bp_type type, |
| expression *cond) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->insert_watchpoint (addr, len, type, cond); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_remove_watchpoint (CORE_ADDR addr, int len, target_hw_bp_type type, |
| expression *cond) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->remove_watchpoint (addr, len, type, cond); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_insert_hw_breakpoint (gdbarch *gdbarch, bp_target_info *bp_tgt) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->insert_hw_breakpoint (gdbarch, bp_tgt); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_remove_hw_breakpoint (gdbarch *gdbarch, bp_target_info *bp_tgt) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->remove_hw_breakpoint (gdbarch, bp_tgt); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_can_accel_watchpoint_condition (CORE_ADDR addr, int len, int type, |
| expression *cond) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->can_accel_watchpoint_condition (addr, len, type, cond); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_can_execute_reverse () |
| { |
| return current_inferior ()->top_target ()->can_execute_reverse (); |
| } |
| |
| ptid_t |
| target_get_ada_task_ptid (long lwp, ULONGEST tid) |
| { |
| return current_inferior ()->top_target ()->get_ada_task_ptid (lwp, tid); |
| } |
| |
| bool |
| target_filesystem_is_local () |
| { |
| return current_inferior ()->top_target ()->filesystem_is_local (); |
| } |
| |
| void |
| target_trace_init () |
| { |
| return current_inferior ()->top_target ()->trace_init (); |
| } |
| |
| void |
| target_download_tracepoint (bp_location *location) |
| { |
| return current_inferior ()->top_target ()->download_tracepoint (location); |
| } |
| |
| bool |
| target_can_download_tracepoint () |
| { |
| return current_inferior ()->top_target ()->can_download_tracepoint (); |
| } |
| |
| void |
| target_download_trace_state_variable (const trace_state_variable &tsv) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->download_trace_state_variable (tsv); |
| } |
| |
| void |
| target_enable_tracepoint (bp_location *loc) |
| { |
| return current_inferior ()->top_target ()->enable_tracepoint (loc); |
| } |
| |
| void |
| target_disable_tracepoint (bp_location *loc) |
| { |
| return current_inferior ()->top_target ()->disable_tracepoint (loc); |
| } |
| |
| void |
| target_trace_start () |
| { |
| return current_inferior ()->top_target ()->trace_start (); |
| } |
| |
| void |
| target_trace_set_readonly_regions () |
| { |
| return current_inferior ()->top_target ()->trace_set_readonly_regions (); |
| } |
| |
| int |
| target_get_trace_status (trace_status *ts) |
| { |
| return current_inferior ()->top_target ()->get_trace_status (ts); |
| } |
| |
| void |
| target_get_tracepoint_status (tracepoint *tp, uploaded_tp *utp) |
| { |
| return current_inferior ()->top_target ()->get_tracepoint_status (tp, utp); |
| } |
| |
| void |
| target_trace_stop () |
| { |
| return current_inferior ()->top_target ()->trace_stop (); |
| } |
| |
| int |
| target_trace_find (trace_find_type type, int num, |
| CORE_ADDR addr1, CORE_ADDR addr2, int *tpp) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->trace_find (type, num, addr1, addr2, tpp); |
| } |
| |
| bool |
| target_get_trace_state_variable_value (int tsv, LONGEST *val) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->get_trace_state_variable_value (tsv, val); |
| } |
| |
| int |
| target_save_trace_data (const char *filename) |
| { |
| return current_inferior ()->top_target ()->save_trace_data (filename); |
| } |
| |
| int |
| target_upload_tracepoints (uploaded_tp **utpp) |
| { |
| return current_inferior ()->top_target ()->upload_tracepoints (utpp); |
| } |
| |
| int |
| target_upload_trace_state_variables (uploaded_tsv **utsvp) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->upload_trace_state_variables (utsvp); |
| } |
| |
| LONGEST |
| target_get_raw_trace_data (gdb_byte *buf, ULONGEST offset, LONGEST len) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->get_raw_trace_data (buf, offset, len); |
| } |
| |
| int |
| target_get_min_fast_tracepoint_insn_len () |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->get_min_fast_tracepoint_insn_len (); |
| } |
| |
| void |
| target_set_disconnected_tracing (int val) |
| { |
| return current_inferior ()->top_target ()->set_disconnected_tracing (val); |
| } |
| |
| void |
| target_set_circular_trace_buffer (int val) |
| { |
| return current_inferior ()->top_target ()->set_circular_trace_buffer (val); |
| } |
| |
| void |
| target_set_trace_buffer_size (LONGEST val) |
| { |
| return current_inferior ()->top_target ()->set_trace_buffer_size (val); |
| } |
| |
| bool |
| target_set_trace_notes (const char *user, const char *notes, |
| const char *stopnotes) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->set_trace_notes (user, notes, stopnotes); |
| } |
| |
| bool |
| target_get_tib_address (ptid_t ptid, CORE_ADDR *addr) |
| { |
| return current_inferior ()->top_target ()->get_tib_address (ptid, addr); |
| } |
| |
| void |
| target_set_permissions () |
| { |
| return current_inferior ()->top_target ()->set_permissions (); |
| } |
| |
| bool |
| target_static_tracepoint_marker_at (CORE_ADDR addr, |
| static_tracepoint_marker *marker) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->static_tracepoint_marker_at (addr, marker); |
| } |
| |
| std::vector<static_tracepoint_marker> |
| target_static_tracepoint_markers_by_strid (const char *marker_id) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->static_tracepoint_markers_by_strid (marker_id); |
| } |
| |
| traceframe_info_up |
| target_traceframe_info () |
| { |
| return current_inferior ()->top_target ()->traceframe_info (); |
| } |
| |
| bool |
| target_use_agent (bool use) |
| { |
| return current_inferior ()->top_target ()->use_agent (use); |
| } |
| |
| bool |
| target_can_use_agent () |
| { |
| return current_inferior ()->top_target ()->can_use_agent (); |
| } |
| |
| bool |
| target_augmented_libraries_svr4_read () |
| { |
| return current_inferior ()->top_target ()->augmented_libraries_svr4_read (); |
| } |
| |
| bool |
| target_supports_memory_tagging () |
| { |
| return current_inferior ()->top_target ()->supports_memory_tagging (); |
| } |
| |
| bool |
| target_fetch_memtags (CORE_ADDR address, size_t len, gdb::byte_vector &tags, |
| int type) |
| { |
| return current_inferior ()->top_target ()->fetch_memtags (address, len, tags, type); |
| } |
| |
| bool |
| target_store_memtags (CORE_ADDR address, size_t len, |
| const gdb::byte_vector &tags, int type) |
| { |
| return current_inferior ()->top_target ()->store_memtags (address, len, tags, type); |
| } |
| |
| bool |
| target_is_address_tagged (gdbarch *gdbarch, CORE_ADDR address) |
| { |
| return current_inferior ()->top_target ()->is_address_tagged (gdbarch, address); |
| } |
| |
| x86_xsave_layout |
| target_fetch_x86_xsave_layout () |
| { |
| return current_inferior ()->top_target ()->fetch_x86_xsave_layout (); |
| } |
| |
| void |
| target_log_command (const char *p) |
| { |
| return current_inferior ()->top_target ()->log_command (p); |
| } |
| |
| /* This is used to implement the various target commands. */ |
| |
| static void |
| open_target (const char *args, int from_tty, struct cmd_list_element *command) |
| { |
| auto *ti = static_cast<target_info *> (command->context ()); |
| target_open_ftype *func = target_factories[ti]; |
| |
| target_debug_printf_nofunc ("-> %s->open (...)", ti->shortname); |
| func (args, from_tty); |
| target_debug_printf_nofunc ("<- %s->open (%s, %d)", ti->shortname, args, from_tty); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| add_target (const target_info &t, target_open_ftype *func, |
| completer_ftype *completer) |
| { |
| struct cmd_list_element *c; |
| |
| auto &func_slot = target_factories[&t]; |
| if (func_slot != nullptr) |
| internal_error (_("target already added (\"%s\")."), t.shortname); |
| func_slot = func; |
| |
| if (targetlist == NULL) |
| add_basic_prefix_cmd ("target", class_run, _("\ |
| Connect to a target machine or process.\n\ |
| The first argument is the type or protocol of the target machine.\n\ |
| Remaining arguments are interpreted by the target protocol. For more\n\ |
| information on the arguments for a particular protocol, type\n\ |
| `help target ' followed by the protocol name."), |
| &targetlist, 0, &cmdlist); |
| c = add_cmd (t.shortname, no_class, t.doc, &targetlist); |
| c->set_context ((void *) &t); |
| c->func = open_target; |
| if (completer != NULL) |
| set_cmd_completer (c, completer); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| add_deprecated_target_alias (const target_info &tinfo, const char *alias) |
| { |
| struct cmd_list_element *c; |
| |
| /* If we use add_alias_cmd, here, we do not get the deprecated warning, |
| see PR cli/15104. */ |
| c = add_cmd (alias, no_class, tinfo.doc, &targetlist); |
| c->func = open_target; |
| c->set_context ((void *) &tinfo); |
| gdb::unique_xmalloc_ptr<char> alt |
| = xstrprintf ("target %s", tinfo.shortname); |
| deprecate_cmd (c, alt.release ()); |
| } |
| |
| /* Stub functions */ |
| |
| void |
| target_kill (void) |
| { |
| |
| /* If the commit_resume_state of the to-be-killed-inferior's process stratum |
| is true, and this inferior is the last live inferior with resumed threads |
| of that target, then we want to leave commit_resume_state to false, as the |
| target won't have any resumed threads anymore. We achieve this with |
| this scoped_disable_commit_resumed. On construction, it will set the flag |
| to false. On destruction, it will only set it to true if there are resumed |
| threads left. */ |
| scoped_disable_commit_resumed disable ("killing"); |
| current_inferior ()->top_target ()->kill (); |
| } |
| |
| void |
| target_load (const char *arg, int from_tty) |
| { |
| target_dcache_invalidate (current_program_space->aspace); |
| current_inferior ()->top_target ()->load (arg, from_tty); |
| } |
| |
| /* Define it. */ |
| |
| target_terminal_state target_terminal::m_terminal_state |
| = target_terminal_state::is_ours; |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::init (void) |
| { |
| current_inferior ()->top_target ()->terminal_init (); |
| |
| m_terminal_state = target_terminal_state::is_ours; |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::inferior (void) |
| { |
| struct ui *ui = current_ui; |
| |
| /* A background resume (``run&'') should leave GDB in control of the |
| terminal. */ |
| if (ui->prompt_state != PROMPT_BLOCKED) |
| return; |
| |
| /* Since we always run the inferior in the main console (unless "set |
| inferior-tty" is in effect), when some UI other than the main one |
| calls target_terminal::inferior, then we leave the main UI's |
| terminal settings as is. */ |
| if (ui != main_ui) |
| return; |
| |
| /* If GDB is resuming the inferior in the foreground, install |
| inferior's terminal modes. */ |
| |
| struct inferior *inf = current_inferior (); |
| |
| if (inf->terminal_state != target_terminal_state::is_inferior) |
| { |
| current_inferior ()->top_target ()->terminal_inferior (); |
| inf->terminal_state = target_terminal_state::is_inferior; |
| } |
| |
| m_terminal_state = target_terminal_state::is_inferior; |
| |
| /* If the user hit C-c before, pretend that it was hit right |
| here. */ |
| if (check_quit_flag ()) |
| target_pass_ctrlc (); |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::restore_inferior (void) |
| { |
| struct ui *ui = current_ui; |
| |
| /* See target_terminal::inferior(). */ |
| if (ui->prompt_state != PROMPT_BLOCKED || ui != main_ui) |
| return; |
| |
| /* Restore the terminal settings of inferiors that were in the |
| foreground but are now ours_for_output due to a temporary |
| target_target::ours_for_output() call. */ |
| |
| { |
| scoped_restore_current_inferior restore_inferior; |
| |
| for (::inferior *inf : all_inferiors ()) |
| { |
| if (inf->terminal_state == target_terminal_state::is_ours_for_output) |
| { |
| set_current_inferior (inf); |
| current_inferior ()->top_target ()->terminal_inferior (); |
| inf->terminal_state = target_terminal_state::is_inferior; |
| } |
| } |
| } |
| |
| m_terminal_state = target_terminal_state::is_inferior; |
| |
| /* If the user hit C-c before, pretend that it was hit right |
| here. */ |
| if (check_quit_flag ()) |
| target_pass_ctrlc (); |
| } |
| |
| /* Switch terminal state to DESIRED_STATE, either is_ours, or |
| is_ours_for_output. */ |
| |
| static void |
| target_terminal_is_ours_kind (target_terminal_state desired_state) |
| { |
| scoped_restore_current_inferior restore_inferior; |
| |
| /* Must do this in two passes. First, have all inferiors save the |
| current terminal settings. Then, after all inferiors have add a |
| chance to safely save the terminal settings, restore GDB's |
| terminal settings. */ |
| |
| for (inferior *inf : all_inferiors ()) |
| { |
| if (inf->terminal_state == target_terminal_state::is_inferior) |
| { |
| set_current_inferior (inf); |
| current_inferior ()->top_target ()->terminal_save_inferior (); |
| } |
| } |
| |
| for (inferior *inf : all_inferiors ()) |
| { |
| /* Note we don't check is_inferior here like above because we |
| need to handle 'is_ours_for_output -> is_ours' too. Careful |
| to never transition from 'is_ours' to 'is_ours_for_output', |
| though. */ |
| if (inf->terminal_state != target_terminal_state::is_ours |
| && inf->terminal_state != desired_state) |
| { |
| set_current_inferior (inf); |
| if (desired_state == target_terminal_state::is_ours) |
| current_inferior ()->top_target ()->terminal_ours (); |
| else if (desired_state == target_terminal_state::is_ours_for_output) |
| current_inferior ()->top_target ()->terminal_ours_for_output (); |
| else |
| gdb_assert_not_reached ("unhandled desired state"); |
| inf->terminal_state = desired_state; |
| } |
| } |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::ours () |
| { |
| struct ui *ui = current_ui; |
| |
| /* See target_terminal::inferior. */ |
| if (ui != main_ui) |
| return; |
| |
| if (m_terminal_state == target_terminal_state::is_ours) |
| return; |
| |
| target_terminal_is_ours_kind (target_terminal_state::is_ours); |
| m_terminal_state = target_terminal_state::is_ours; |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::ours_for_output () |
| { |
| struct ui *ui = current_ui; |
| |
| /* See target_terminal::inferior. */ |
| if (ui != main_ui) |
| return; |
| |
| if (!target_terminal::is_inferior ()) |
| return; |
| |
| target_terminal_is_ours_kind (target_terminal_state::is_ours_for_output); |
| target_terminal::m_terminal_state = target_terminal_state::is_ours_for_output; |
| } |
| |
| /* See target/target.h. */ |
| |
| void |
| target_terminal::info (const char *arg, int from_tty) |
| { |
| current_inferior ()->top_target ()->terminal_info (arg, from_tty); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_supports_terminal_ours (void) |
| { |
| /* The current top target is the target at the top of the target |
| stack of the current inferior. While normally there's always an |
| inferior, we must check for nullptr here because we can get here |
| very early during startup, before the initial inferior is first |
| created. */ |
| inferior *inf = current_inferior (); |
| |
| if (inf == nullptr) |
| return false; |
| return inf->top_target ()->supports_terminal_ours (); |
| } |
| |
| static void |
| tcomplain (void) |
| { |
| error (_("You can't do that when your target is `%s'"), |
| current_inferior ()->top_target ()->shortname ()); |
| } |
| |
| void |
| noprocess (void) |
| { |
| error (_("You can't do that without a process to debug.")); |
| } |
| |
| static void |
| default_terminal_info (struct target_ops *self, const char *args, int from_tty) |
| { |
| gdb_printf (_("No saved terminal information.\n")); |
| } |
| |
| /* A default implementation for the to_get_ada_task_ptid target method. |
| |
| This function builds the PTID by using both LWP and TID as part of |
| the PTID lwp and tid elements. The pid used is the pid of the |
| inferior_ptid. */ |
| |
| static ptid_t |
| default_get_ada_task_ptid (struct target_ops *self, long lwp, ULONGEST tid) |
| { |
| return ptid_t (inferior_ptid.pid (), lwp, tid); |
| } |
| |
| static enum exec_direction_kind |
| default_execution_direction (struct target_ops *self) |
| { |
| if (!target_can_execute_reverse ()) |
| return EXEC_FORWARD; |
| else if (!target_can_async_p ()) |
| return EXEC_FORWARD; |
| else |
| gdb_assert_not_reached ("\ |
| to_execution_direction must be implemented for reverse async"); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_ops_ref_policy::decref (target_ops *t) |
| { |
| t->decref (); |
| if (t->refcount () == 0) |
| { |
| if (t->stratum () == process_stratum) |
| connection_list_remove (as_process_stratum_target (t)); |
| |
| for (inferior *inf : all_inferiors ()) |
| gdb_assert (!inf->target_is_pushed (t)); |
| |
| fileio_handles_invalidate_target (t); |
| |
| t->close (); |
| |
| target_debug_printf_nofunc ("closing target"); |
| } |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_stack::push (target_ops *t) |
| { |
| /* We must create a new reference first. It is possible that T is |
| already pushed on this target stack, in which case we will first |
| unpush it below, before re-pushing it. If we don't increment the |
| reference count now, then when we unpush it, we might end up deleting |
| T, which is not good. */ |
| auto ref = target_ops_ref::new_reference (t); |
| |
| strata stratum = t->stratum (); |
| |
| /* If there's already a target at this stratum, remove it. */ |
| |
| if (m_stack[stratum].get () != nullptr) |
| unpush (m_stack[stratum].get ()); |
| |
| /* Now add the new one. */ |
| m_stack[stratum] = std::move (ref); |
| |
| if (m_top < stratum) |
| m_top = stratum; |
| |
| if (stratum == process_stratum) |
| connection_list_add (as_process_stratum_target (t)); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_stack::unpush (target_ops *t) |
| { |
| gdb_assert (t != NULL); |
| |
| strata stratum = t->stratum (); |
| |
| if (stratum == dummy_stratum) |
| internal_error (_("Attempt to unpush the dummy target")); |
| |
| /* Look for the specified target. Note that a target can only occur |
| once in the target stack. */ |
| |
| if (m_stack[stratum] != t) |
| { |
| /* If T wasn't pushed, quit. Only open targets should be |
| closed. */ |
| return false; |
| } |
| |
| if (m_top == stratum) |
| m_top = this->find_beneath (t)->stratum (); |
| |
| /* Move the target reference off the target stack, this sets the pointer |
| held in m_stack to nullptr, and places the reference in ref. When |
| ref goes out of scope its reference count will be decremented, which |
| might cause the target to close. |
| |
| We have to do it this way, and not just set the value in m_stack to |
| nullptr directly, because doing so would decrement the reference |
| count first, which might close the target, and closing the target |
| does a check that the target is not on any inferiors target_stack. */ |
| auto ref = std::move (m_stack[stratum]); |
| |
| return true; |
| } |
| |
| void |
| target_unpusher::operator() (struct target_ops *ops) const |
| { |
| current_inferior ()->unpush_target (ops); |
| } |
| |
| /* Default implementation of to_get_thread_local_address. */ |
| |
| static void |
| generic_tls_error (void) |
| { |
| throw_error (TLS_GENERIC_ERROR, |
| _("Cannot find thread-local variables on this target")); |
| } |
| |
| /* Using the objfile specified in OBJFILE, find the address for the |
| current thread's thread-local storage with offset OFFSET. */ |
| CORE_ADDR |
| target_translate_tls_address (struct objfile *objfile, CORE_ADDR offset) |
| { |
| volatile CORE_ADDR addr = 0; |
| struct target_ops *target = current_inferior ()->top_target (); |
| gdbarch *gdbarch = current_inferior ()->arch (); |
| |
| /* If OBJFILE is a separate debug object file, look for the |
| original object file. */ |
| if (objfile->separate_debug_objfile_backlink != NULL) |
| objfile = objfile->separate_debug_objfile_backlink; |
| |
| if (gdbarch_fetch_tls_load_module_address_p (gdbarch)) |
| { |
| ptid_t ptid = inferior_ptid; |
| |
| try |
| { |
| CORE_ADDR lm_addr; |
| |
| /* Fetch the load module address for this objfile. */ |
| lm_addr = gdbarch_fetch_tls_load_module_address (gdbarch, |
| objfile); |
| |
| if (gdbarch_get_thread_local_address_p (gdbarch)) |
| addr = gdbarch_get_thread_local_address (gdbarch, ptid, lm_addr, |
| offset); |
| else |
| addr = target->get_thread_local_address (ptid, lm_addr, offset); |
| } |
| /* If an error occurred, print TLS related messages here. Otherwise, |
| throw the error to some higher catcher. */ |
| catch (const gdb_exception &ex) |
| { |
| int objfile_is_library = (objfile->flags & OBJF_SHARED); |
| |
| switch (ex.error) |
| { |
| case TLS_NO_LIBRARY_SUPPORT_ERROR: |
| error (_("Cannot find thread-local variables " |
| "in this thread library.")); |
| break; |
| case TLS_LOAD_MODULE_NOT_FOUND_ERROR: |
| if (objfile_is_library) |
| error (_("Cannot find shared library `%s' in dynamic" |
| " linker's load module list"), objfile_name (objfile)); |
| else |
| error (_("Cannot find executable file `%s' in dynamic" |
| " linker's load module list"), objfile_name (objfile)); |
| break; |
| case TLS_NOT_ALLOCATED_YET_ERROR: |
| if (objfile_is_library) |
| error (_("The inferior has not yet allocated storage for" |
| " thread-local variables in\n" |
| "the shared library `%s'\n" |
| "for %s"), |
| objfile_name (objfile), |
| target_pid_to_str (ptid).c_str ()); |
| else |
| error (_("The inferior has not yet allocated storage for" |
| " thread-local variables in\n" |
| "the executable `%s'\n" |
| "for %s"), |
| objfile_name (objfile), |
| target_pid_to_str (ptid).c_str ()); |
| break; |
| case TLS_GENERIC_ERROR: |
| if (objfile_is_library) |
| error (_("Cannot find thread-local storage for %s, " |
| "shared library %s:\n%s"), |
| target_pid_to_str (ptid).c_str (), |
| objfile_name (objfile), ex.what ()); |
| else |
| error (_("Cannot find thread-local storage for %s, " |
| "executable file %s:\n%s"), |
| target_pid_to_str (ptid).c_str (), |
| objfile_name (objfile), ex.what ()); |
| break; |
| default: |
| throw; |
| break; |
| } |
| } |
| } |
| else |
| error (_("Cannot find thread-local variables on this target")); |
| |
| return addr; |
| } |
| |
| const char * |
| target_xfer_status_to_string (enum target_xfer_status status) |
| { |
| #define CASE(X) case X: return #X |
| switch (status) |
| { |
| CASE(TARGET_XFER_E_IO); |
| CASE(TARGET_XFER_UNAVAILABLE); |
| default: |
| return "<unknown>"; |
| } |
| #undef CASE |
| }; |
| |
| |
| const std::vector<target_section> * |
| target_get_section_table (struct target_ops *target) |
| { |
| return target->get_section_table (); |
| } |
| |
| /* Find a section containing ADDR. */ |
| |
| const struct target_section * |
| target_section_by_addr (struct target_ops *target, CORE_ADDR addr) |
| { |
| const std::vector<target_section> *table = target_get_section_table (target); |
| |
| if (table == NULL) |
| return NULL; |
| |
| for (const target_section &secp : *table) |
| { |
| if (addr >= secp.addr && addr < secp.endaddr) |
| return &secp; |
| } |
| return NULL; |
| } |
| |
| /* See target.h. */ |
| |
| const std::vector<target_section> * |
| default_get_section_table () |
| { |
| return ¤t_program_space->target_sections (); |
| } |
| |
| /* Helper for the memory xfer routines. Checks the attributes of the |
| memory region of MEMADDR against the read or write being attempted. |
| If the access is permitted returns true, otherwise returns false. |
| REGION_P is an optional output parameter. If not-NULL, it is |
| filled with a pointer to the memory region of MEMADDR. REG_LEN |
| returns LEN trimmed to the end of the region. This is how much the |
| caller can continue requesting, if the access is permitted. A |
| single xfer request must not straddle memory region boundaries. */ |
| |
| static int |
| memory_xfer_check_region (gdb_byte *readbuf, const gdb_byte *writebuf, |
| ULONGEST memaddr, ULONGEST len, ULONGEST *reg_len, |
| struct mem_region **region_p) |
| { |
| struct mem_region *region; |
| |
| region = lookup_mem_region (memaddr); |
| |
| if (region_p != NULL) |
| *region_p = region; |
| |
| switch (region->attrib.mode) |
| { |
| case MEM_RO: |
| if (writebuf != NULL) |
| return 0; |
| break; |
| |
| case MEM_WO: |
| if (readbuf != NULL) |
| return 0; |
| break; |
| |
| case MEM_FLASH: |
| /* We only support writing to flash during "load" for now. */ |
| if (writebuf != NULL) |
| error (_("Writing to flash memory forbidden in this context")); |
| break; |
| |
| case MEM_NONE: |
| return 0; |
| } |
| |
| /* region->hi == 0 means there's no upper bound. */ |
| if (memaddr + len < region->hi || region->hi == 0) |
| *reg_len = len; |
| else |
| *reg_len = region->hi - memaddr; |
| |
| return 1; |
| } |
| |
| /* Read memory from more than one valid target. A core file, for |
| instance, could have some of memory but delegate other bits to |
| the target below it. So, we must manually try all targets. */ |
| |
| enum target_xfer_status |
| raw_memory_xfer_partial (struct target_ops *ops, gdb_byte *readbuf, |
| const gdb_byte *writebuf, ULONGEST memaddr, LONGEST len, |
| ULONGEST *xfered_len) |
| { |
| enum target_xfer_status res; |
| |
| do |
| { |
| res = ops->xfer_partial (TARGET_OBJECT_MEMORY, NULL, |
| readbuf, writebuf, memaddr, len, |
| xfered_len); |
| if (res == TARGET_XFER_OK) |
| break; |
| |
| /* Stop if the target reports that the memory is not available. */ |
| if (res == TARGET_XFER_UNAVAILABLE) |
| break; |
| |
| /* Don't continue past targets which have all the memory. |
| At one time, this code was necessary to read data from |
| executables / shared libraries when data for the requested |
| addresses weren't available in the core file. But now the |
| core target handles this case itself. */ |
| if (ops->has_all_memory ()) |
| break; |
| |
| ops = ops->beneath (); |
| } |
| while (ops != NULL); |
| |
| /* The cache works at the raw memory level. Make sure the cache |
| gets updated with raw contents no matter what kind of memory |
| object was originally being written. Note we do write-through |
| first, so that if it fails, we don't write to the cache contents |
| that never made it to the target. */ |
| if (writebuf != NULL |
| && inferior_ptid != null_ptid |
| && target_dcache_init_p (current_program_space->aspace) |
| && (stack_cache_enabled_p () || code_cache_enabled_p ())) |
| { |
| DCACHE *dcache = target_dcache_get (current_program_space->aspace); |
| |
| /* Note that writing to an area of memory which wasn't present |
| in the cache doesn't cause it to be loaded in. */ |
| dcache_update (dcache, res, memaddr, writebuf, *xfered_len); |
| } |
| |
| return res; |
| } |
| |
| /* Perform a partial memory transfer. |
| For docs see target.h, to_xfer_partial. */ |
| |
| static enum target_xfer_status |
| memory_xfer_partial_1 (struct target_ops *ops, enum target_object object, |
| gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST memaddr, |
| ULONGEST len, ULONGEST *xfered_len) |
| { |
| enum target_xfer_status res; |
| ULONGEST reg_len; |
| struct mem_region *region; |
| struct inferior *inf; |
| |
| /* For accesses to unmapped overlay sections, read directly from |
| files. Must do this first, as MEMADDR may need adjustment. */ |
| if (readbuf != NULL && overlay_debugging) |
| { |
| struct obj_section *section = find_pc_overlay (memaddr); |
| |
| if (pc_in_unmapped_range (memaddr, section)) |
| { |
| const std::vector<target_section> *table = target_get_section_table (ops); |
| const char *section_name = section->the_bfd_section->name; |
| |
| memaddr = overlay_mapped_address (memaddr, section); |
| |
| auto match_cb = [=] (const struct target_section *s) |
| { |
| return (strcmp (section_name, s->the_bfd_section->name) == 0); |
| }; |
| |
| return section_table_xfer_memory_partial (readbuf, writebuf, |
| memaddr, len, xfered_len, |
| *table, match_cb); |
| } |
| } |
| |
| /* Try the executable files, if "trust-readonly-sections" is set. */ |
| if (readbuf != NULL && trust_readonly) |
| { |
| const struct target_section *secp |
| = target_section_by_addr (ops, memaddr); |
| if (secp != NULL |
| && (bfd_section_flags (secp->the_bfd_section) & SEC_READONLY)) |
| { |
| const std::vector<target_section> *table = target_get_section_table (ops); |
| return section_table_xfer_memory_partial (readbuf, writebuf, |
| memaddr, len, xfered_len, |
| *table); |
| } |
| } |
| |
| /* Try GDB's internal data cache. */ |
| |
| if (!memory_xfer_check_region (readbuf, writebuf, memaddr, len, ®_len, |
| ®ion)) |
| return TARGET_XFER_E_IO; |
| |
| if (inferior_ptid != null_ptid) |
| inf = current_inferior (); |
| else |
| inf = NULL; |
| |
| if (inf != NULL |
| && readbuf != NULL |
| /* The dcache reads whole cache lines; that doesn't play well |
| with reading from a trace buffer, because reading outside of |
| the collected memory range fails. */ |
| && get_traceframe_number () == -1 |
| && (region->attrib.cache |
| || (stack_cache_enabled_p () && object == TARGET_OBJECT_STACK_MEMORY) |
| || (code_cache_enabled_p () && object == TARGET_OBJECT_CODE_MEMORY))) |
| { |
| DCACHE *dcache |
| = target_dcache_get_or_init (current_program_space->aspace); |
| |
| return dcache_read_memory_partial (ops, dcache, memaddr, readbuf, |
| reg_len, xfered_len); |
| } |
| |
| /* If none of those methods found the memory we wanted, fall back |
| to a target partial transfer. Normally a single call to |
| to_xfer_partial is enough; if it doesn't recognize an object |
| it will call the to_xfer_partial of the next target down. |
| But for memory this won't do. Memory is the only target |
| object which can be read from more than one valid target. |
| A core file, for instance, could have some of memory but |
| delegate other bits to the target below it. So, we must |
| manually try all targets. */ |
| |
| res = raw_memory_xfer_partial (ops, readbuf, writebuf, memaddr, reg_len, |
| xfered_len); |
| |
| /* If we still haven't got anything, return the last error. We |
| give up. */ |
| return res; |
| } |
| |
| /* Perform a partial memory transfer. For docs see target.h, |
| to_xfer_partial. */ |
| |
| static enum target_xfer_status |
| memory_xfer_partial (struct target_ops *ops, enum target_object object, |
| gdb_byte *readbuf, const gdb_byte *writebuf, |
| ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) |
| { |
| enum target_xfer_status res; |
| |
| /* Zero length requests are ok and require no work. */ |
| if (len == 0) |
| return TARGET_XFER_EOF; |
| |
| memaddr = gdbarch_remove_non_address_bits (current_inferior ()->arch (), |
| memaddr); |
| |
| /* Fill in READBUF with breakpoint shadows, or WRITEBUF with |
| breakpoint insns, thus hiding out from higher layers whether |
| there are software breakpoints inserted in the code stream. */ |
| if (readbuf != NULL) |
| { |
| res = memory_xfer_partial_1 (ops, object, readbuf, NULL, memaddr, len, |
| xfered_len); |
| |
| if (res == TARGET_XFER_OK && !show_memory_breakpoints) |
| breakpoint_xfer_memory (readbuf, NULL, NULL, memaddr, *xfered_len); |
| } |
| else |
| { |
| /* A large write request is likely to be partially satisfied |
| by memory_xfer_partial_1. We will continually malloc |
| and free a copy of the entire write request for breakpoint |
| shadow handling even though we only end up writing a small |
| subset of it. Cap writes to a limit specified by the target |
| to mitigate this. */ |
| len = std::min (ops->get_memory_xfer_limit (), len); |
| |
| gdb::byte_vector buf (writebuf, writebuf + len); |
| breakpoint_xfer_memory (NULL, buf.data (), writebuf, memaddr, len); |
| res = memory_xfer_partial_1 (ops, object, NULL, buf.data (), memaddr, len, |
| xfered_len); |
| } |
| |
| return res; |
| } |
| |
| scoped_restore_tmpl<int> |
| make_scoped_restore_show_memory_breakpoints (int show) |
| { |
| return make_scoped_restore (&show_memory_breakpoints, show); |
| } |
| |
| /* For docs see target.h, to_xfer_partial. */ |
| |
| enum target_xfer_status |
| target_xfer_partial (struct target_ops *ops, |
| enum target_object object, const char *annex, |
| gdb_byte *readbuf, const gdb_byte *writebuf, |
| ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len) |
| { |
| enum target_xfer_status retval; |
| |
| /* Transfer is done when LEN is zero. */ |
| if (len == 0) |
| return TARGET_XFER_EOF; |
| |
| if (writebuf && !may_write_memory) |
| error (_("Writing to memory is not allowed (addr %s, len %s)"), |
| core_addr_to_string_nz (offset), plongest (len)); |
| |
| *xfered_len = 0; |
| |
| /* If this is a memory transfer, let the memory-specific code |
| have a look at it instead. Memory transfers are more |
| complicated. */ |
| if (object == TARGET_OBJECT_MEMORY || object == TARGET_OBJECT_STACK_MEMORY |
| || object == TARGET_OBJECT_CODE_MEMORY) |
| retval = memory_xfer_partial (ops, object, readbuf, |
| writebuf, offset, len, xfered_len); |
| else if (object == TARGET_OBJECT_RAW_MEMORY) |
| { |
| /* Skip/avoid accessing the target if the memory region |
| attributes block the access. Check this here instead of in |
| raw_memory_xfer_partial as otherwise we'd end up checking |
| this twice in the case of the memory_xfer_partial path is |
| taken; once before checking the dcache, and another in the |
| tail call to raw_memory_xfer_partial. */ |
| if (!memory_xfer_check_region (readbuf, writebuf, offset, len, &len, |
| NULL)) |
| return TARGET_XFER_E_IO; |
| |
| /* Request the normal memory object from other layers. */ |
| retval = raw_memory_xfer_partial (ops, readbuf, writebuf, offset, len, |
| xfered_len); |
| } |
| else |
| retval = ops->xfer_partial (object, annex, readbuf, |
| writebuf, offset, len, xfered_len); |
| |
| if (targetdebug) |
| { |
| const unsigned char *myaddr = NULL; |
| std::string s |
| = string_printf ("%s:target_xfer_partial " |
| "(%d, %s, %s, %s, %s, %s) = %d, %s", |
| ops->shortname (), (int) object, |
| (annex ? annex : "(null)"), |
| host_address_to_string (readbuf), |
| host_address_to_string (writebuf), |
| core_addr_to_string_nz (offset), pulongest (len), |
| retval, pulongest (*xfered_len)); |
| |
| if (readbuf) |
| myaddr = readbuf; |
| if (writebuf) |
| myaddr = writebuf; |
| if (retval == TARGET_XFER_OK && myaddr != NULL) |
| { |
| int i; |
| |
| string_appendf (s, ", bytes ="); |
| for (i = 0; i < *xfered_len; i++) |
| { |
| if ((((intptr_t) &(myaddr[i])) & 0xf) == 0) |
| { |
| if (targetdebug < 2 && i > 0) |
| { |
| string_appendf (s, " ..."); |
| break; |
| } |
| |
| target_debug_printf_nofunc ("%s", s.c_str ()); |
| s.clear(); |
| } |
| |
| string_appendf (s, " %02x", myaddr[i] & 0xff); |
| } |
| } |
| |
| target_debug_printf_nofunc ("%s", s.c_str ()); |
| } |
| |
| /* Check implementations of to_xfer_partial update *XFERED_LEN |
| properly. Do assertion after printing debug messages, so that we |
| can find more clues on assertion failure from debugging messages. */ |
| if (retval == TARGET_XFER_OK || retval == TARGET_XFER_UNAVAILABLE) |
| gdb_assert (*xfered_len > 0); |
| |
| return retval; |
| } |
| |
| /* Read LEN bytes of target memory at address MEMADDR, placing the |
| results in GDB's memory at MYADDR. Returns either 0 for success or |
| -1 if any error occurs. |
| |
| If an error occurs, no guarantee is made about the contents of the data at |
| MYADDR. In particular, the caller should not depend upon partial reads |
| filling the buffer with good data. There is no way for the caller to know |
| how much good data might have been transfered anyway. Callers that can |
| deal with partial reads should call target_read (which will retry until |
| it makes no progress, and then return how much was transferred). */ |
| |
| int |
| target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| if (target_read (current_inferior ()->top_target (), |
| TARGET_OBJECT_MEMORY, NULL, |
| myaddr, memaddr, len) == len) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) |
| { |
| gdb_byte buf[4]; |
| int r; |
| |
| r = target_read_memory (memaddr, buf, sizeof buf); |
| if (r != 0) |
| return r; |
| *result = extract_unsigned_integer |
| (buf, sizeof buf, |
| gdbarch_byte_order (current_inferior ()->arch ())); |
| return 0; |
| } |
| |
| /* Like target_read_memory, but specify explicitly that this is a read |
| from the target's raw memory. That is, this read bypasses the |
| dcache, breakpoint shadowing, etc. */ |
| |
| int |
| target_read_raw_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| if (target_read (current_inferior ()->top_target (), |
| TARGET_OBJECT_RAW_MEMORY, NULL, |
| myaddr, memaddr, len) == len) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /* Like target_read_memory, but specify explicitly that this is a read from |
| the target's stack. This may trigger different cache behavior. */ |
| |
| int |
| target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| if (target_read (current_inferior ()->top_target (), |
| TARGET_OBJECT_STACK_MEMORY, NULL, |
| myaddr, memaddr, len) == len) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /* Like target_read_memory, but specify explicitly that this is a read from |
| the target's code. This may trigger different cache behavior. */ |
| |
| int |
| target_read_code (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| if (target_read (current_inferior ()->top_target (), |
| TARGET_OBJECT_CODE_MEMORY, NULL, |
| myaddr, memaddr, len) == len) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /* Write LEN bytes from MYADDR to target memory at address MEMADDR. |
| Returns either 0 for success or -1 if any error occurs. If an |
| error occurs, no guarantee is made about how much data got written. |
| Callers that can deal with partial writes should call |
| target_write. */ |
| |
| int |
| target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) |
| { |
| if (target_write (current_inferior ()->top_target (), |
| TARGET_OBJECT_MEMORY, NULL, |
| myaddr, memaddr, len) == len) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /* Write LEN bytes from MYADDR to target raw memory at address |
| MEMADDR. Returns either 0 for success or -1 if any error occurs. |
| If an error occurs, no guarantee is made about how much data got |
| written. Callers that can deal with partial writes should call |
| target_write. */ |
| |
| int |
| target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) |
| { |
| if (target_write (current_inferior ()->top_target (), |
| TARGET_OBJECT_RAW_MEMORY, NULL, |
| myaddr, memaddr, len) == len) |
| return 0; |
| else |
| return -1; |
| } |
| |
| /* Fetch the target's memory map. */ |
| |
| std::vector<mem_region> |
| target_memory_map (void) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| std::vector<mem_region> result = target->memory_map (); |
| if (result.empty ()) |
| return result; |
| |
| std::sort (result.begin (), result.end ()); |
| |
| /* Check that regions do not overlap. Simultaneously assign |
| a numbering for the "mem" commands to use to refer to |
| each region. */ |
| mem_region *last_one = NULL; |
| for (size_t ix = 0; ix < result.size (); ix++) |
| { |
| mem_region *this_one = &result[ix]; |
| this_one->number = ix; |
| |
| if (last_one != NULL && last_one->hi > this_one->lo) |
| { |
| warning (_("Overlapping regions in memory map: ignoring")); |
| return std::vector<mem_region> (); |
| } |
| |
| last_one = this_one; |
| } |
| |
| return result; |
| } |
| |
| void |
| target_flash_erase (ULONGEST address, LONGEST length) |
| { |
| current_inferior ()->top_target ()->flash_erase (address, length); |
| } |
| |
| void |
| target_flash_done (void) |
| { |
| current_inferior ()->top_target ()->flash_done (); |
| } |
| |
| static void |
| show_trust_readonly (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| gdb_printf (file, |
| _("Mode for reading from readonly sections is %s.\n"), |
| value); |
| } |
| |
| /* Target vector read/write partial wrapper functions. */ |
| |
| static enum target_xfer_status |
| target_read_partial (struct target_ops *ops, |
| enum target_object object, |
| const char *annex, gdb_byte *buf, |
| ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len) |
| { |
| return target_xfer_partial (ops, object, annex, buf, NULL, offset, len, |
| xfered_len); |
| } |
| |
| static enum target_xfer_status |
| target_write_partial (struct target_ops *ops, |
| enum target_object object, |
| const char *annex, const gdb_byte *buf, |
| ULONGEST offset, LONGEST len, ULONGEST *xfered_len) |
| { |
| return target_xfer_partial (ops, object, annex, NULL, buf, offset, len, |
| xfered_len); |
| } |
| |
| /* Wrappers to perform the full transfer. */ |
| |
| /* For docs on target_read see target.h. */ |
| |
| LONGEST |
| target_read (struct target_ops *ops, |
| enum target_object object, |
| const char *annex, gdb_byte *buf, |
| ULONGEST offset, LONGEST len) |
| { |
| LONGEST xfered_total = 0; |
| int unit_size = 1; |
| |
| /* If we are reading from a memory object, find the length of an addressable |
| unit for that architecture. */ |
| if (object == TARGET_OBJECT_MEMORY |
| || object == TARGET_OBJECT_STACK_MEMORY |
| || object == TARGET_OBJECT_CODE_MEMORY |
| || object == TARGET_OBJECT_RAW_MEMORY) |
| unit_size = gdbarch_addressable_memory_unit_size |
| (current_inferior ()->arch ()); |
| |
| while (xfered_total < len) |
| { |
| ULONGEST xfered_partial; |
| enum target_xfer_status status; |
| |
| status = target_read_partial (ops, object, annex, |
| buf + xfered_total * unit_size, |
| offset + xfered_total, len - xfered_total, |
| &xfered_partial); |
| |
| /* Call an observer, notifying them of the xfer progress? */ |
| if (status == TARGET_XFER_EOF) |
| return xfered_total; |
| else if (status == TARGET_XFER_OK) |
| { |
| xfered_total += xfered_partial; |
| QUIT; |
| } |
| else |
| return TARGET_XFER_E_IO; |
| |
| } |
| return len; |
| } |
| |
| /* Assuming that the entire [begin, end) range of memory cannot be |
| read, try to read whatever subrange is possible to read. |
| |
| The function returns, in RESULT, either zero or one memory block. |
| If there's a readable subrange at the beginning, it is completely |
| read and returned. Any further readable subrange will not be read. |
| Otherwise, if there's a readable subrange at the end, it will be |
| completely read and returned. Any readable subranges before it |
| (obviously, not starting at the beginning), will be ignored. In |
| other cases -- either no readable subrange, or readable subrange(s) |
| that is neither at the beginning, or end, nothing is returned. |
| |
| The purpose of this function is to handle a read across a boundary |
| of accessible memory in a case when memory map is not available. |
| The above restrictions are fine for this case, but will give |
| incorrect results if the memory is 'patchy'. However, supporting |
| 'patchy' memory would require trying to read every single byte, |
| and it seems unacceptable solution. Explicit memory map is |
| recommended for this case -- and target_read_memory_robust will |
| take care of reading multiple ranges then. */ |
| |
| static void |
| read_whatever_is_readable (struct target_ops *ops, |
| const ULONGEST begin, const ULONGEST end, |
| int unit_size, |
| std::vector<memory_read_result> *result) |
| { |
| ULONGEST current_begin = begin; |
| ULONGEST current_end = end; |
| int forward; |
| ULONGEST xfered_len; |
| |
| /* If we previously failed to read 1 byte, nothing can be done here. */ |
| if (end - begin <= 1) |
| return; |
| |
| gdb::unique_xmalloc_ptr<gdb_byte> buf ((gdb_byte *) xmalloc (end - begin)); |
| |
| /* Check that either first or the last byte is readable, and give up |
| if not. This heuristic is meant to permit reading accessible memory |
| at the boundary of accessible region. */ |
| if (target_read_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| buf.get (), begin, 1, &xfered_len) == TARGET_XFER_OK) |
| { |
| forward = 1; |
| ++current_begin; |
| } |
| else if (target_read_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| buf.get () + (end - begin) - 1, end - 1, 1, |
| &xfered_len) == TARGET_XFER_OK) |
| { |
| forward = 0; |
| --current_end; |
| } |
| else |
| return; |
| |
| /* Loop invariant is that the [current_begin, current_end) was previously |
| found to be not readable as a whole. |
| |
| Note loop condition -- if the range has 1 byte, we can't divide the range |
| so there's no point trying further. */ |
| while (current_end - current_begin > 1) |
| { |
| ULONGEST first_half_begin, first_half_end; |
| ULONGEST second_half_begin, second_half_end; |
| LONGEST xfer; |
| ULONGEST middle = current_begin + (current_end - current_begin) / 2; |
| |
| if (forward) |
| { |
| first_half_begin = current_begin; |
| first_half_end = middle; |
| second_half_begin = middle; |
| second_half_end = current_end; |
| } |
| else |
| { |
| first_half_begin = middle; |
| first_half_end = current_end; |
| second_half_begin = current_begin; |
| second_half_end = middle; |
| } |
| |
| xfer = target_read (ops, TARGET_OBJECT_MEMORY, NULL, |
| buf.get () + (first_half_begin - begin) * unit_size, |
| first_half_begin, |
| first_half_end - first_half_begin); |
| |
| if (xfer == first_half_end - first_half_begin) |
| { |
| /* This half reads up fine. So, the error must be in the |
| other half. */ |
| current_begin = second_half_begin; |
| current_end = second_half_end; |
| } |
| else |
| { |
| /* This half is not readable. Because we've tried one byte, we |
| know some part of this half if actually readable. Go to the next |
| iteration to divide again and try to read. |
| |
| We don't handle the other half, because this function only tries |
| to read a single readable subrange. */ |
| current_begin = first_half_begin; |
| current_end = first_half_end; |
| } |
| } |
| |
| if (forward) |
| { |
| /* The [begin, current_begin) range has been read. */ |
| result->emplace_back (begin, current_end, std::move (buf)); |
| } |
| else |
| { |
| /* The [current_end, end) range has been read. */ |
| LONGEST region_len = end - current_end; |
| |
| gdb::unique_xmalloc_ptr<gdb_byte> data |
| ((gdb_byte *) xmalloc (region_len * unit_size)); |
| memcpy (data.get (), buf.get () + (current_end - begin) * unit_size, |
| region_len * unit_size); |
| result->emplace_back (current_end, end, std::move (data)); |
| } |
| } |
| |
| std::vector<memory_read_result> |
| read_memory_robust (struct target_ops *ops, |
| const ULONGEST offset, const LONGEST len) |
| { |
| std::vector<memory_read_result> result; |
| int unit_size |
| = gdbarch_addressable_memory_unit_size (current_inferior ()->arch ()); |
| |
| LONGEST xfered_total = 0; |
| while (xfered_total < len) |
| { |
| struct mem_region *region = lookup_mem_region (offset + xfered_total); |
| LONGEST region_len; |
| |
| /* If there is no explicit region, a fake one should be created. */ |
| gdb_assert (region); |
| |
| if (region->hi == 0) |
| region_len = len - xfered_total; |
| else |
| region_len = region->hi - offset; |
| |
| if (region->attrib.mode == MEM_NONE || region->attrib.mode == MEM_WO) |
| { |
| /* Cannot read this region. Note that we can end up here only |
| if the region is explicitly marked inaccessible, or |
| 'inaccessible-by-default' is in effect. */ |
| xfered_total += region_len; |
| } |
| else |
| { |
| LONGEST to_read = std::min (len - xfered_total, region_len); |
| gdb::unique_xmalloc_ptr<gdb_byte> buffer |
| ((gdb_byte *) xmalloc (to_read * unit_size)); |
| |
| LONGEST xfered_partial = |
| target_read (ops, TARGET_OBJECT_MEMORY, NULL, buffer.get (), |
| offset + xfered_total, to_read); |
| /* Call an observer, notifying them of the xfer progress? */ |
| if (xfered_partial <= 0) |
| { |
| /* Got an error reading full chunk. See if maybe we can read |
| some subrange. */ |
| read_whatever_is_readable (ops, offset + xfered_total, |
| offset + xfered_total + to_read, |
| unit_size, &result); |
| xfered_total += to_read; |
| } |
| else |
| { |
| result.emplace_back (offset + xfered_total, |
| offset + xfered_total + xfered_partial, |
| std::move (buffer)); |
| xfered_total += xfered_partial; |
| } |
| QUIT; |
| } |
| } |
| |
| return result; |
| } |
| |
| |
| /* An alternative to target_write with progress callbacks. */ |
| |
| LONGEST |
| target_write_with_progress (struct target_ops *ops, |
| enum target_object object, |
| const char *annex, const gdb_byte *buf, |
| ULONGEST offset, LONGEST len, |
| void (*progress) (ULONGEST, void *), void *baton) |
| { |
| LONGEST xfered_total = 0; |
| int unit_size = 1; |
| |
| /* If we are writing to a memory object, find the length of an addressable |
| unit for that architecture. */ |
| if (object == TARGET_OBJECT_MEMORY |
| || object == TARGET_OBJECT_STACK_MEMORY |
| || object == TARGET_OBJECT_CODE_MEMORY |
| || object == TARGET_OBJECT_RAW_MEMORY) |
| unit_size = gdbarch_addressable_memory_unit_size |
| (current_inferior ()->arch ()); |
| |
| /* Give the progress callback a chance to set up. */ |
| if (progress) |
| (*progress) (0, baton); |
| |
| while (xfered_total < len) |
| { |
| ULONGEST xfered_partial; |
| enum target_xfer_status status; |
| |
| status = target_write_partial (ops, object, annex, |
| buf + xfered_total * unit_size, |
| offset + xfered_total, len - xfered_total, |
| &xfered_partial); |
| |
| if (status != TARGET_XFER_OK) |
| return status == TARGET_XFER_EOF ? xfered_total : TARGET_XFER_E_IO; |
| |
| if (progress) |
| (*progress) (xfered_partial, baton); |
| |
| xfered_total += xfered_partial; |
| QUIT; |
| } |
| return len; |
| } |
| |
| /* For docs on target_write see target.h. */ |
| |
| LONGEST |
| target_write (struct target_ops *ops, |
| enum target_object object, |
| const char *annex, const gdb_byte *buf, |
| ULONGEST offset, LONGEST len) |
| { |
| return target_write_with_progress (ops, object, annex, buf, offset, len, |
| NULL, NULL); |
| } |
| |
| /* Help for target_read_alloc and target_read_stralloc. See their comments |
| for details. */ |
| |
| template <typename T> |
| std::optional<gdb::def_vector<T>> |
| target_read_alloc_1 (struct target_ops *ops, enum target_object object, |
| const char *annex) |
| { |
| gdb::def_vector<T> buf; |
| size_t buf_pos = 0; |
| const int chunk = 4096; |
| |
| /* This function does not have a length parameter; it reads the |
| entire OBJECT). Also, it doesn't support objects fetched partly |
| from one target and partly from another (in a different stratum, |
| e.g. a core file and an executable). Both reasons make it |
| unsuitable for reading memory. */ |
| gdb_assert (object != TARGET_OBJECT_MEMORY); |
| |
| /* Start by reading up to 4K at a time. The target will throttle |
| this number down if necessary. */ |
| while (1) |
| { |
| ULONGEST xfered_len; |
| enum target_xfer_status status; |
| |
| buf.resize (buf_pos + chunk); |
| |
| status = target_read_partial (ops, object, annex, |
| (gdb_byte *) &buf[buf_pos], |
| buf_pos, chunk, |
| &xfered_len); |
| |
| if (status == TARGET_XFER_EOF) |
| { |
| /* Read all there was. */ |
| buf.resize (buf_pos); |
| return buf; |
| } |
| else if (status != TARGET_XFER_OK) |
| { |
| /* An error occurred. */ |
| return {}; |
| } |
| |
| buf_pos += xfered_len; |
| |
| QUIT; |
| } |
| } |
| |
| /* See target.h */ |
| |
| std::optional<gdb::byte_vector> |
| target_read_alloc (struct target_ops *ops, enum target_object object, |
| const char *annex) |
| { |
| return target_read_alloc_1<gdb_byte> (ops, object, annex); |
| } |
| |
| /* See target.h. */ |
| |
| std::optional<gdb::char_vector> |
| target_read_stralloc (struct target_ops *ops, enum target_object object, |
| const char *annex) |
| { |
| std::optional<gdb::char_vector> buf |
| = target_read_alloc_1<char> (ops, object, annex); |
| |
| if (!buf) |
| return {}; |
| |
| if (buf->empty () || buf->back () != '\0') |
| buf->push_back ('\0'); |
| |
| /* Check for embedded NUL bytes; but allow trailing NULs. */ |
| for (auto it = std::find (buf->begin (), buf->end (), '\0'); |
| it != buf->end (); it++) |
| if (*it != '\0') |
| { |
| warning (_("target object %d, annex %s, " |
| "contained unexpected null characters"), |
| (int) object, annex ? annex : "(none)"); |
| break; |
| } |
| |
| return buf; |
| } |
| |
| /* Memory transfer methods. */ |
| |
| void |
| get_target_memory (struct target_ops *ops, CORE_ADDR addr, gdb_byte *buf, |
| LONGEST len) |
| { |
| /* This method is used to read from an alternate, non-current |
| target. This read must bypass the overlay support (as symbols |
| don't match this target), and GDB's internal cache (wrong cache |
| for this target). */ |
| if (target_read (ops, TARGET_OBJECT_RAW_MEMORY, NULL, buf, addr, len) |
| != len) |
| memory_error (TARGET_XFER_E_IO, addr); |
| } |
| |
| ULONGEST |
| get_target_memory_unsigned (struct target_ops *ops, CORE_ADDR addr, |
| int len, enum bfd_endian byte_order) |
| { |
| gdb_byte buf[sizeof (ULONGEST)]; |
| |
| gdb_assert (len <= sizeof (buf)); |
| get_target_memory (ops, addr, buf, len); |
| return extract_unsigned_integer (buf, len, byte_order); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_insert_breakpoint (struct gdbarch *gdbarch, |
| struct bp_target_info *bp_tgt) |
| { |
| if (!may_insert_breakpoints) |
| { |
| warning (_("May not insert breakpoints")); |
| return 1; |
| } |
| |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->insert_breakpoint (gdbarch, bp_tgt); |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_remove_breakpoint (struct gdbarch *gdbarch, |
| struct bp_target_info *bp_tgt, |
| enum remove_bp_reason reason) |
| { |
| /* This is kind of a weird case to handle, but the permission might |
| have been changed after breakpoints were inserted - in which case |
| we should just take the user literally and assume that any |
| breakpoints should be left in place. */ |
| if (!may_insert_breakpoints) |
| { |
| warning (_("May not remove breakpoints")); |
| return 1; |
| } |
| |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->remove_breakpoint (gdbarch, bp_tgt, reason); |
| } |
| |
| static void |
| info_target_command (const char *args, int from_tty) |
| { |
| int has_all_mem = 0; |
| |
| if (current_program_space->symfile_object_file != NULL) |
| { |
| objfile *objf = current_program_space->symfile_object_file; |
| gdb_printf (_("Symbols from \"%ps\".\n"), |
| styled_string (file_name_style.style (), |
| objfile_name (objf))); |
| } |
| |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| { |
| if (!t->has_memory ()) |
| continue; |
| |
| if ((int) (t->stratum ()) <= (int) dummy_stratum) |
| continue; |
| if (has_all_mem) |
| gdb_printf (_("\tWhile running this, " |
| "GDB does not access memory from...\n")); |
| gdb_printf ("%s:\n", t->longname ()); |
| t->files_info (); |
| has_all_mem = t->has_all_memory (); |
| } |
| } |
| |
| /* This function is called before any new inferior is created, e.g. |
| by running a program, attaching, or connecting to a target. |
| It cleans up any state from previous invocations which might |
| change between runs. This is a subset of what target_preopen |
| resets (things which might change between targets). */ |
| |
| void |
| target_pre_inferior () |
| { |
| /* Clear out solib state. Otherwise the solib state of the previous |
| inferior might have survived and is entirely wrong for the new |
| target. This has been observed on GNU/Linux using glibc 2.3. How |
| to reproduce: |
| |
| bash$ ./foo& |
| [1] 4711 |
| bash$ ./foo& |
| [1] 4712 |
| bash$ gdb ./foo |
| [...] |
| (gdb) attach 4711 |
| (gdb) detach |
| (gdb) attach 4712 |
| Cannot access memory at address 0xdeadbeef |
| */ |
| |
| /* In some OSs, the shared library list is the same/global/shared |
| across inferiors. If code is shared between processes, so are |
| memory regions and features. */ |
| if (!gdbarch_has_global_solist (current_inferior ()->arch ())) |
| { |
| no_shared_libraries (current_program_space); |
| |
| invalidate_target_mem_regions (); |
| |
| target_clear_description (); |
| } |
| |
| /* attach_flag may be set if the previous process associated with |
| the inferior was attached to. */ |
| current_inferior ()->attach_flag = false; |
| |
| current_inferior ()->highest_thread_num = 0; |
| |
| update_previous_thread (); |
| |
| agent_capability_invalidate (); |
| } |
| |
| /* This is to be called by the open routine before it does |
| anything. */ |
| |
| void |
| target_preopen (int from_tty) |
| { |
| dont_repeat (); |
| |
| if (current_inferior ()->pid != 0) |
| { |
| if (!from_tty |
| || !target_has_execution () |
| || query (_("A program is being debugged already. Kill it? "))) |
| { |
| /* Core inferiors actually should be detached, not |
| killed. */ |
| if (target_has_execution ()) |
| target_kill (); |
| else |
| target_detach (current_inferior (), 0); |
| } |
| else |
| error (_("Program not killed.")); |
| } |
| |
| /* Release reference to old previous thread. */ |
| update_previous_thread (); |
| |
| /* Calling target_kill may remove the target from the stack. But if |
| it doesn't (which seems like a win for UDI), remove it now. */ |
| /* Leave the exec target, though. The user may be switching from a |
| live process to a core of the same program. */ |
| current_inferior ()->pop_all_targets_above (file_stratum); |
| |
| target_pre_inferior (); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_detach (inferior *inf, int from_tty) |
| { |
| /* Thread's don't need to be resumed until the end of this function. */ |
| scoped_disable_commit_resumed disable_commit_resumed ("detaching"); |
| |
| /* After we have detached, we will clear the register cache for this inferior |
| by calling registers_changed_ptid. We must save the pid_ptid before |
| detaching, as the target detach method will clear inf->pid. */ |
| ptid_t save_pid_ptid = ptid_t (inf->pid); |
| |
| /* As long as some to_detach implementations rely on the current_inferior |
| (either directly, or indirectly, like through reading memory), INF needs |
| to be the current inferior. When that requirement will become no longer |
| true, then we can remove this assertion. */ |
| gdb_assert (inf == current_inferior ()); |
| |
| prepare_for_detach (); |
| |
| gdb::observers::inferior_pre_detach.notify (inf); |
| |
| /* Hold a strong reference because detaching may unpush the |
| target. */ |
| auto proc_target_ref = target_ops_ref::new_reference (inf->process_target ()); |
| |
| current_inferior ()->top_target ()->detach (inf, from_tty); |
| |
| process_stratum_target *proc_target |
| = as_process_stratum_target (proc_target_ref.get ()); |
| |
| registers_changed_ptid (proc_target, save_pid_ptid); |
| |
| /* We have to ensure we have no frame cache left. Normally, |
| registers_changed_ptid (save_pid_ptid) calls reinit_frame_cache when |
| inferior_ptid matches save_pid_ptid, but in our case, it does not |
| call it, as inferior_ptid has been reset. */ |
| reinit_frame_cache (); |
| |
| disable_commit_resumed.reset_and_commit (); |
| } |
| |
| void |
| target_disconnect (const char *args, int from_tty) |
| { |
| /* If we're in breakpoints-always-inserted mode or if breakpoints |
| are global across processes, we have to remove them before |
| disconnecting. */ |
| remove_breakpoints (); |
| |
| current_inferior ()->top_target ()->disconnect (args, from_tty); |
| } |
| |
| /* See target/target.h. */ |
| |
| ptid_t |
| target_wait (ptid_t ptid, struct target_waitstatus *status, |
| target_wait_flags options) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| process_stratum_target *proc_target = current_inferior ()->process_target (); |
| |
| gdb_assert (!proc_target->commit_resumed_state); |
| |
| if (!target_can_async_p (target)) |
| gdb_assert ((options & TARGET_WNOHANG) == 0); |
| |
| try |
| { |
| gdb::observers::target_pre_wait.notify (ptid); |
| ptid_t event_ptid = target->wait (ptid, status, options); |
| gdb::observers::target_post_wait.notify (event_ptid); |
| return event_ptid; |
| } |
| catch (...) |
| { |
| gdb::observers::target_post_wait.notify (null_ptid); |
| throw; |
| } |
| } |
| |
| /* See target.h. */ |
| |
| ptid_t |
| default_target_wait (struct target_ops *ops, |
| ptid_t ptid, struct target_waitstatus *status, |
| target_wait_flags options) |
| { |
| status->set_ignore (); |
| return minus_one_ptid; |
| } |
| |
| std::string |
| target_pid_to_str (ptid_t ptid) |
| { |
| return current_inferior ()->top_target ()->pid_to_str (ptid); |
| } |
| |
| const char * |
| target_thread_name (struct thread_info *info) |
| { |
| gdb_assert (info->inf == current_inferior ()); |
| |
| return current_inferior ()->top_target ()->thread_name (info); |
| } |
| |
| struct thread_info * |
| target_thread_handle_to_thread_info (const gdb_byte *thread_handle, |
| int handle_len, |
| struct inferior *inf) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->thread_handle_to_thread_info (thread_handle, handle_len, inf); |
| } |
| |
| /* See target.h. */ |
| |
| gdb::array_view<const gdb_byte> |
| target_thread_info_to_thread_handle (struct thread_info *tip) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->thread_info_to_thread_handle (tip); |
| } |
| |
| void |
| target_resume (ptid_t scope_ptid, int step, enum gdb_signal signal) |
| { |
| process_stratum_target *curr_target = current_inferior ()->process_target (); |
| gdb_assert (!curr_target->commit_resumed_state); |
| |
| gdb_assert (inferior_ptid != null_ptid); |
| gdb_assert (inferior_ptid.matches (scope_ptid)); |
| |
| target_dcache_invalidate (current_program_space->aspace); |
| |
| current_inferior ()->top_target ()->resume (scope_ptid, step, signal); |
| |
| registers_changed_ptid (curr_target, scope_ptid); |
| /* We only set the internal executing state here. The user/frontend |
| running state is set at a higher level. This also clears the |
| thread's stop_pc as side effect. */ |
| set_executing (curr_target, scope_ptid, true); |
| clear_inline_frame_state (curr_target, scope_ptid); |
| |
| if (target_can_async_p ()) |
| target_async (true); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_commit_resumed () |
| { |
| gdb_assert (current_inferior ()->process_target ()->commit_resumed_state); |
| current_inferior ()->top_target ()->commit_resumed (); |
| } |
| |
| /* See target.h. */ |
| |
| bool |
| target_has_pending_events () |
| { |
| return current_inferior ()->top_target ()->has_pending_events (); |
| } |
| |
| void |
| target_pass_signals (gdb::array_view<const unsigned char> pass_signals) |
| { |
| current_inferior ()->top_target ()->pass_signals (pass_signals); |
| } |
| |
| void |
| target_program_signals (gdb::array_view<const unsigned char> program_signals) |
| { |
| current_inferior ()->top_target ()->program_signals (program_signals); |
| } |
| |
| static void |
| default_follow_fork (struct target_ops *self, inferior *child_inf, |
| ptid_t child_ptid, target_waitkind fork_kind, |
| bool follow_child, bool detach_fork) |
| { |
| /* Some target returned a fork event, but did not know how to follow it. */ |
| internal_error (_("could not find a target to follow fork")); |
| } |
| |
| static void |
| default_follow_clone (struct target_ops *self, ptid_t child_ptid) |
| { |
| /* Some target returned a clone event, but did not know how to follow it. */ |
| internal_error (_("could not find a target to follow clone")); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_follow_fork (inferior *child_inf, ptid_t child_ptid, |
| target_waitkind fork_kind, bool follow_child, |
| bool detach_fork) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| /* Check consistency between CHILD_INF, CHILD_PTID, FOLLOW_CHILD and |
| DETACH_FORK. */ |
| if (child_inf != nullptr) |
| { |
| gdb_assert (follow_child || !detach_fork); |
| gdb_assert (child_inf->pid == child_ptid.pid ()); |
| } |
| else |
| gdb_assert (!follow_child && detach_fork); |
| |
| return target->follow_fork (child_inf, child_ptid, fork_kind, follow_child, |
| detach_fork); |
| } |
| |
| /* See target.h. */ |
| |
| void |
| target_follow_exec (inferior *follow_inf, ptid_t ptid, |
| const char *execd_pathname) |
| { |
| current_inferior ()->top_target ()->follow_exec (follow_inf, ptid, |
| execd_pathname); |
| } |
| |
| static void |
| default_mourn_inferior (struct target_ops *self) |
| { |
| internal_error (_("could not find a target to follow mourn inferior")); |
| } |
| |
| void |
| target_mourn_inferior (ptid_t ptid) |
| { |
| gdb_assert (ptid.pid () == inferior_ptid.pid ()); |
| current_inferior ()->top_target ()->mourn_inferior (); |
| } |
| |
| /* Look for a target which can describe architectural features, starting |
| from TARGET. If we find one, return its description. */ |
| |
| const struct target_desc * |
| target_read_description (struct target_ops *target) |
| { |
| return target->read_description (); |
| } |
| |
| |
| /* Default implementation of memory-searching. */ |
| |
| static int |
| default_search_memory (struct target_ops *self, |
| CORE_ADDR start_addr, ULONGEST search_space_len, |
| const gdb_byte *pattern, ULONGEST pattern_len, |
| CORE_ADDR *found_addrp) |
| { |
| auto read_memory = [=] (CORE_ADDR addr, gdb_byte *result, size_t len) |
| { |
| return target_read (current_inferior ()->top_target (), |
| TARGET_OBJECT_MEMORY, NULL, |
| result, addr, len) == len; |
| }; |
| |
| /* Start over from the top of the target stack. */ |
| return simple_search_memory (read_memory, start_addr, search_space_len, |
| pattern, pattern_len, found_addrp); |
| } |
| |
| /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the |
| sequence of bytes in PATTERN with length PATTERN_LEN. |
| |
| The result is 1 if found, 0 if not found, and -1 if there was an error |
| requiring halting of the search (e.g. memory read error). |
| If the pattern is found the address is recorded in FOUND_ADDRP. */ |
| |
| int |
| target_search_memory (CORE_ADDR start_addr, ULONGEST search_space_len, |
| const gdb_byte *pattern, ULONGEST pattern_len, |
| CORE_ADDR *found_addrp) |
| { |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return target->search_memory (start_addr, search_space_len, pattern, |
| pattern_len, found_addrp); |
| } |
| |
| /* Look through the currently pushed targets. If none of them will |
| be able to restart the currently running process, issue an error |
| message. */ |
| |
| void |
| target_require_runnable (void) |
| { |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| { |
| /* If this target knows how to create a new program, then |
| assume we will still be able to after killing the current |
| one. Either killing and mourning will not pop T, or else |
| find_default_run_target will find it again. */ |
| if (t->can_create_inferior ()) |
| return; |
| |
| /* Do not worry about targets at certain strata that can not |
| create inferiors. Assume they will be pushed again if |
| necessary, and continue to the process_stratum. */ |
| if (t->stratum () > process_stratum) |
| continue; |
| |
| error (_("The \"%s\" target does not support \"run\". " |
| "Try \"help target\" or \"continue\"."), |
| t->shortname ()); |
| } |
| |
| /* This function is only called if the target is running. In that |
| case there should have been a process_stratum target and it |
| should either know how to create inferiors, or not... */ |
| internal_error (_("No targets found")); |
| } |
| |
| /* Whether GDB is allowed to fall back to the default run target for |
| "run", "attach", etc. when no target is connected yet. */ |
| static bool auto_connect_native_target = true; |
| |
| static void |
| show_auto_connect_native_target (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| gdb_printf (file, |
| _("Whether GDB may automatically connect to the " |
| "native target is %s.\n"), |
| value); |
| } |
| |
| /* A pointer to the target that can respond to "run" or "attach". |
| Native targets are always singletons and instantiated early at GDB |
| startup. */ |
| static target_ops *the_native_target; |
| |
| /* See target.h. */ |
| |
| void |
| set_native_target (target_ops *target) |
| { |
| if (the_native_target != NULL) |
| internal_error (_("native target already set (\"%s\")."), |
| the_native_target->longname ()); |
| |
| the_native_target = target; |
| } |
| |
| /* See target.h. */ |
| |
| target_ops * |
| get_native_target () |
| { |
| return the_native_target; |
| } |
| |
| /* Look through the list of possible targets for a target that can |
| execute a run or attach command without any other data. This is |
| used to locate the default process stratum. |
| |
| If DO_MESG is not NULL, the result is always valid (error() is |
| called for errors); else, return NULL on error. */ |
| |
| static struct target_ops * |
| find_default_run_target (const char *do_mesg) |
| { |
| if (auto_connect_native_target && the_native_target != NULL) |
| return the_native_target; |
| |
| if (do_mesg != NULL) |
| error (_("Don't know how to %s. Try \"help target\"."), do_mesg); |
| return NULL; |
| } |
| |
| /* See target.h. */ |
| |
| struct target_ops * |
| find_attach_target (void) |
| { |
| /* If a target on the current stack can attach, use it. */ |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| { |
| if (t->can_attach ()) |
| return t; |
| } |
| |
| /* Otherwise, use the default run target for attaching. */ |
| return find_default_run_target ("attach"); |
| } |
| |
| /* See target.h. */ |
| |
| struct target_ops * |
| find_run_target (void) |
| { |
| /* If a target on the current stack can run, use it. */ |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| { |
| if (t->can_create_inferior ()) |
| return t; |
| } |
| |
| /* Otherwise, use the default run target. */ |
| return find_default_run_target ("run"); |
| } |
| |
| bool |
| target_ops::info_proc (const char *args, enum info_proc_what what) |
| { |
| return false; |
| } |
| |
| /* Implement the "info proc" command. */ |
| |
| int |
| target_info_proc (const char *args, enum info_proc_what what) |
| { |
| struct target_ops *t; |
| |
| /* If we're already connected to something that can get us OS |
| related data, use it. Otherwise, try using the native |
| target. */ |
| t = find_target_at (process_stratum); |
| if (t == NULL) |
| t = find_default_run_target (NULL); |
| |
| for (; t != NULL; t = t->beneath ()) |
| { |
| if (t->info_proc (args, what)) |
| { |
| target_debug_printf_nofunc ("target_info_proc (\"%s\", %d)", args, what); |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int |
| find_default_supports_disable_randomization (struct target_ops *self) |
| { |
| struct target_ops *t; |
| |
| t = find_default_run_target (NULL); |
| if (t != NULL) |
| return t->supports_disable_randomization (); |
| return 0; |
| } |
| |
| int |
| target_supports_disable_randomization (void) |
| { |
| return current_inferior ()->top_target ()->supports_disable_randomization (); |
| } |
| |
| /* See target/target.h. */ |
| |
| int |
| target_supports_multi_process (void) |
| { |
| return current_inferior ()->top_target ()->supports_multi_process (); |
| } |
| |
| /* See target.h. */ |
| |
| std::optional<gdb::char_vector> |
| target_get_osdata (const char *type) |
| { |
| struct target_ops *t; |
| |
| /* If we're already connected to something that can get us OS |
| related data, use it. Otherwise, try using the native |
| target. */ |
| t = find_target_at (process_stratum); |
| if (t == NULL) |
| t = find_default_run_target ("get OS data"); |
| |
| if (!t) |
| return {}; |
| |
| return target_read_stralloc (t, TARGET_OBJECT_OSDATA, type); |
| } |
| |
| /* See target.h. */ |
| |
| target_ops * |
| target_ops::beneath () const |
| { |
| return current_inferior ()->find_target_beneath (this); |
| } |
| |
| void |
| target_ops::close () |
| { |
| } |
| |
| bool |
| target_ops::can_attach () |
| { |
| return 0; |
| } |
| |
| void |
| target_ops::attach (const char *, int) |
| { |
| gdb_assert_not_reached ("target_ops::attach called"); |
| } |
| |
| bool |
| target_ops::can_create_inferior () |
| { |
| return 0; |
| } |
| |
| void |
| target_ops::create_inferior (const char *, const std::string &, |
| char **, int) |
| { |
| gdb_assert_not_reached ("target_ops::create_inferior called"); |
| } |
| |
| bool |
| target_ops::can_run () |
| { |
| return false; |
| } |
| |
| int |
| target_can_run () |
| { |
| for (target_ops *t = current_inferior ()->top_target (); |
| t != NULL; |
| t = t->beneath ()) |
| { |
| if (t->can_run ()) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Target file operations. */ |
| |
| static struct target_ops * |
| default_fileio_target (void) |
| { |
| struct target_ops *t; |
| |
| /* If we're already connected to something that can perform |
| file I/O, use it. Otherwise, try using the native target. */ |
| t = find_target_at (process_stratum); |
| if (t != NULL) |
| return t; |
| return find_default_run_target ("file I/O"); |
| } |
| |
| /* File handle for target file operations. */ |
| |
| struct fileio_fh_t |
| { |
| /* The target on which this file is open. NULL if the target is |
| meanwhile closed while the handle is open. */ |
| target_ops *target; |
| |
| /* The file descriptor on the target. */ |
| int target_fd; |
| |
| /* Check whether this fileio_fh_t represents a closed file. */ |
| bool is_closed () |
| { |
| return target_fd < 0; |
| } |
| }; |
| |
| /* Vector of currently open file handles. The value returned by |
| target_fileio_open and passed as the FD argument to other |
| target_fileio_* functions is an index into this vector. This |
| vector's entries are never freed; instead, files are marked as |
| closed, and the handle becomes available for reuse. */ |
| static std::vector<fileio_fh_t> fileio_fhandles; |
| |
| /* Index into fileio_fhandles of the lowest handle that might be |
| closed. This permits handle reuse without searching the whole |
| list each time a new file is opened. */ |
| static int lowest_closed_fd; |
| |
| /* See target.h. */ |
| |
| void |
| fileio_handles_invalidate_target (target_ops *targ) |
| { |
| for (fileio_fh_t &fh : fileio_fhandles) |
| if (fh.target == targ) |
| fh.target = NULL; |
| } |
| |
| /* Acquire a target fileio file descriptor. */ |
| |
| static int |
| acquire_fileio_fd (target_ops *target, int target_fd) |
| { |
| /* Search for closed handles to reuse. */ |
| for (; lowest_closed_fd < fileio_fhandles.size (); lowest_closed_fd++) |
| { |
| fileio_fh_t &fh = fileio_fhandles[lowest_closed_fd]; |
| |
| if (fh.is_closed ()) |
| break; |
| } |
| |
| /* Push a new handle if no closed handles were found. */ |
| if (lowest_closed_fd == fileio_fhandles.size ()) |
| fileio_fhandles.push_back (fileio_fh_t {target, target_fd}); |
| else |
| fileio_fhandles[lowest_closed_fd] = {target, target_fd}; |
| |
| /* Should no longer be marked closed. */ |
| gdb_assert (!fileio_fhandles[lowest_closed_fd].is_closed ()); |
| |
| /* Return its index, and start the next lookup at |
| the next index. */ |
| return lowest_closed_fd++; |
| } |
| |
| /* Release a target fileio file descriptor. */ |
| |
| static void |
| release_fileio_fd (int fd, fileio_fh_t *fh) |
| { |
| fh->target_fd = -1; |
| lowest_closed_fd = std::min (lowest_closed_fd, fd); |
| } |
| |
| /* Return a pointer to the fileio_fhandle_t corresponding to FD. */ |
| |
| static fileio_fh_t * |
| fileio_fd_to_fh (int fd) |
| { |
| return &fileio_fhandles[fd]; |
| } |
| |
| |
| /* Default implementations of file i/o methods. We don't want these |
| to delegate automatically, because we need to know which target |
| supported the method, in order to call it directly from within |
| pread/pwrite, etc. */ |
| |
| int |
| target_ops::fileio_open (struct inferior *inf, const char *filename, |
| int flags, int mode, int warn_if_slow, |
| fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| int |
| target_ops::fileio_pwrite (int fd, const gdb_byte *write_buf, int len, |
| ULONGEST offset, fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| int |
| target_ops::fileio_pread (int fd, gdb_byte *read_buf, int len, |
| ULONGEST offset, fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| int |
| target_ops::fileio_fstat (int fd, struct stat *sb, fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| int |
| target_ops::fileio_stat (struct inferior *inf, const char *filename, |
| struct stat *sb, fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| int |
| target_ops::fileio_close (int fd, fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| int |
| target_ops::fileio_unlink (struct inferior *inf, const char *filename, |
| fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| std::optional<std::string> |
| target_ops::fileio_readlink (struct inferior *inf, const char *filename, |
| fileio_error *target_errno) |
| { |
| *target_errno = FILEIO_ENOSYS; |
| return {}; |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_fileio_open (struct inferior *inf, const char *filename, |
| int flags, int mode, bool warn_if_slow, fileio_error *target_errno) |
| { |
| for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| { |
| int fd = t->fileio_open (inf, filename, flags, mode, |
| warn_if_slow, target_errno); |
| |
| if (fd == -1 && *target_errno == FILEIO_ENOSYS) |
| continue; |
| |
| if (fd < 0) |
| fd = -1; |
| else |
| fd = acquire_fileio_fd (t, fd); |
| |
| target_debug_printf_nofunc ("target_fileio_open (%d,%s,0x%x,0%o,%d) = %d (%d)", |
| inf == NULL ? 0 : inf->num, filename, flags, mode, |
| warn_if_slow, fd, fd != -1 ? 0 : *target_errno); |
| return fd; |
| } |
| |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_fileio_pwrite (int fd, const gdb_byte *write_buf, int len, |
| ULONGEST offset, fileio_error *target_errno) |
| { |
| fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| int ret = -1; |
| |
| if (fh->is_closed ()) |
| *target_errno = FILEIO_EBADF; |
| else if (fh->target == NULL) |
| *target_errno = FILEIO_EIO; |
| else |
| ret = fh->target->fileio_pwrite (fh->target_fd, write_buf, |
| len, offset, target_errno); |
| |
| target_debug_printf_nofunc ("target_fileio_pwrite (%d,...,%d,%s) = %d (%d)", fd, |
| len, pulongest (offset), ret, |
| ret != -1 ? 0 : *target_errno); |
| return ret; |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_fileio_pread (int fd, gdb_byte *read_buf, int len, |
| ULONGEST offset, fileio_error *target_errno) |
| { |
| fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| int ret = -1; |
| |
| if (fh->is_closed ()) |
| *target_errno = FILEIO_EBADF; |
| else if (fh->target == NULL) |
| *target_errno = FILEIO_EIO; |
| else |
| ret = fh->target->fileio_pread (fh->target_fd, read_buf, |
| len, offset, target_errno); |
| |
| target_debug_printf_nofunc ("target_fileio_pread (%d,...,%d,%s) = %d (%d)", fd, len, |
| pulongest (offset), ret, ret != -1 ? 0 : *target_errno); |
| return ret; |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_fileio_fstat (int fd, struct stat *sb, fileio_error *target_errno) |
| { |
| fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| int ret = -1; |
| |
| if (fh->is_closed ()) |
| *target_errno = FILEIO_EBADF; |
| else if (fh->target == NULL) |
| *target_errno = FILEIO_EIO; |
| else |
| ret = fh->target->fileio_fstat (fh->target_fd, sb, target_errno); |
| |
| target_debug_printf_nofunc ("target_fileio_fstat (%d) = %d (%d)", fd, ret, |
| ret != -1 ? 0 : *target_errno); |
| return ret; |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_fileio_stat (struct inferior *inf, const char *filename, |
| struct stat *sb, fileio_error *target_errno) |
| { |
| for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| { |
| int ret = t->fileio_stat (inf, filename, sb, target_errno); |
| |
| if (ret == -1 && *target_errno == FILEIO_ENOSYS) |
| continue; |
| |
| target_debug_printf_nofunc ("target_fileio_stat (%s) = %d (%d)", |
| filename, ret, |
| ret != -1 ? 0 : *target_errno); |
| return ret; |
| } |
| |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_fileio_close (int fd, fileio_error *target_errno) |
| { |
| fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| int ret = -1; |
| |
| if (fh->is_closed ()) |
| *target_errno = FILEIO_EBADF; |
| else |
| { |
| if (fh->target != NULL) |
| ret = fh->target->fileio_close (fh->target_fd, |
| target_errno); |
| else |
| ret = 0; |
| release_fileio_fd (fd, fh); |
| } |
| |
| target_debug_printf_nofunc ("target_fileio_close (%d) = %d (%d)", fd, ret, |
| ret != -1 ? 0 : *target_errno); |
| return ret; |
| } |
| |
| /* See target.h. */ |
| |
| int |
| target_fileio_unlink (struct inferior *inf, const char *filename, |
| fileio_error *target_errno) |
| { |
| for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| { |
| int ret = t->fileio_unlink (inf, filename, target_errno); |
| |
| if (ret == -1 && *target_errno == FILEIO_ENOSYS) |
| continue; |
| |
| target_debug_printf_nofunc ("target_fileio_unlink (%d,%s) = %d (%d)", |
| inf == NULL ? 0 : inf->num, filename, ret, |
| ret != -1 ? 0 : *target_errno); |
| return ret; |
| } |
| |
| *target_errno = FILEIO_ENOSYS; |
| return -1; |
| } |
| |
| /* See target.h. */ |
| |
| std::optional<std::string> |
| target_fileio_readlink (struct inferior *inf, const char *filename, |
| fileio_error *target_errno) |
| { |
| for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| { |
| std::optional<std::string> ret |
| = t->fileio_readlink (inf, filename, target_errno); |
| |
| if (!ret.has_value () && *target_errno == FILEIO_ENOSYS) |
| continue; |
| |
| target_debug_printf_nofunc ("target_fileio_readlink (%d,%s) = %s (%d)", |
| inf == NULL ? 0 : inf->num, filename, |
| ret ? ret->c_str () : "(nil)", |
| ret ? 0 : *target_errno); |
| return ret; |
| } |
| |
| *target_errno = FILEIO_ENOSYS; |
| return {}; |
| } |
| |
| /* Like scoped_fd, but specific to target fileio. */ |
| |
| class scoped_target_fd |
| { |
| public: |
| explicit scoped_target_fd (int fd) noexcept |
| : m_fd (fd) |
| { |
| } |
| |
| ~scoped_target_fd () |
| { |
| if (m_fd >= 0) |
| { |
| fileio_error target_errno; |
| |
|