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3d40fbb53b
Ref: https://sourceware.org/ml/gdb-patches/2015-08/msg00675.html If multiprocess extensions are off (because specific gdbserver port doesn't support them), then when gdbserver doesn't have a thread selected yet, and GDB sends Hg packet to select one, gdbserver crashes. That's because extracting the desired thread id out of the packet that GDB sent depends on the current thread to fill in the missing process id ... Fix this by getting the process id from the first (and only) process in the processes list instead. The GNU/Linux port doesn't trip on this because it always runs with multiprocess extensions enabled. To make it easier to catch such regressions going forward, this commit also adds a new smoke test that spawns gdbserver, connects to it and runs to main with the multiprocess extensions force-disabled. gdb/gdbserver/ChangeLog: 2015-08-24 Pedro Alves <palves@redhat.com> * inferiors.c (get_first_process): New function. * inferiors.h (get_first_process): New declaration. * remote-utils.c (read_ptid): Default to the first process in the list, instead of to the current thread's process. gdb/testsuite/ChangeLog: 2015-08-24 Pedro Alves <palves@redhat.com> * gdb.server/connect-without-multi-process.c: New file. * gdb.server/connect-without-multi-process.exp: New file.
158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/* Inferior process information for the remote server for GDB.
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Copyright (C) 1993-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef INFERIORS_H
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#define INFERIORS_H
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/* Generic information for tracking a list of ``inferiors'' - threads,
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processes, etc. */
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struct inferior_list
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{
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struct inferior_list_entry *head;
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struct inferior_list_entry *tail;
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};
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struct inferior_list_entry
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{
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ptid_t id;
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struct inferior_list_entry *next;
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};
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struct thread_info;
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struct regcache;
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struct target_desc;
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struct sym_cache;
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struct breakpoint;
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struct raw_breakpoint;
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struct fast_tracepoint_jump;
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struct process_info_private;
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struct process_info
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{
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/* This must appear first.
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The list iterator functions assume it. */
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struct inferior_list_entry entry;
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/* Nonzero if this child process was attached rather than
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spawned. */
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int attached;
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/* True if GDB asked us to detach from this process, but we remained
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attached anyway. */
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int gdb_detached;
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/* The symbol cache. */
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struct sym_cache *symbol_cache;
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/* The list of memory breakpoints. */
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struct breakpoint *breakpoints;
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/* The list of raw memory breakpoints. */
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struct raw_breakpoint *raw_breakpoints;
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/* The list of installed fast tracepoints. */
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struct fast_tracepoint_jump *fast_tracepoint_jumps;
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const struct target_desc *tdesc;
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/* Private target data. */
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struct process_info_private *priv;
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};
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#define ptid_of(inf) ((inf)->entry.id)
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#define pid_of(inf) ptid_get_pid ((inf)->entry.id)
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#define lwpid_of(inf) ptid_get_lwp ((inf)->entry.id)
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/* Return a pointer to the process that corresponds to the current
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thread (current_thread). It is an error to call this if there is
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no current thread selected. */
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struct process_info *current_process (void);
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struct process_info *get_thread_process (struct thread_info *);
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extern struct inferior_list all_processes;
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void add_inferior_to_list (struct inferior_list *list,
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struct inferior_list_entry *new_inferior);
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void for_each_inferior (struct inferior_list *list,
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void (*action) (struct inferior_list_entry *));
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void for_each_inferior_with_data
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(struct inferior_list *list,
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void (*action) (struct inferior_list_entry *, void *),
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void *data);
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void clear_inferior_list (struct inferior_list *list);
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int one_inferior_p (struct inferior_list *list);
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/* Helper for ALL_INFERIORS_TYPE. Gets the next element starting at
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CUR, if CUR is not NULL. */
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#define A_I_NEXT(type, list, cur) \
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((cur) != NULL \
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? (type *) ((struct inferior_list_entry *) cur)->next \
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: NULL)
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/* Iterate over all inferiors of type TYPE in LIST, open loop
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style. */
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#define ALL_INFERIORS_TYPE(type, list, cur, tmp) \
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for ((cur) = (type *) (list)->head, (tmp) = A_I_NEXT (type, list, cur); \
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(cur) != NULL; \
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(cur) = (tmp), (tmp) = A_I_NEXT (type, list, cur))
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/* Iterate over all inferiors in LIST, open loop style. */
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#define ALL_INFERIORS(list, cur, tmp) \
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ALL_INFERIORS_TYPE (struct inferior_list_entry, list, cur, tmp)
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/* Iterate over all processes, open loop style. */
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#define ALL_PROCESSES(cur, tmp) \
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ALL_INFERIORS_TYPE (struct process_info, &all_processes, cur, tmp)
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extern struct thread_info *current_thread;
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void remove_inferior (struct inferior_list *list,
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struct inferior_list_entry *entry);
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struct inferior_list_entry *get_first_inferior (struct inferior_list *list);
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/* Return the first process in the processes list. */
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struct process_info *get_first_process (void);
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struct process_info *add_process (int pid, int attached);
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void remove_process (struct process_info *process);
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struct process_info *find_process_pid (int pid);
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int have_started_inferiors_p (void);
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int have_attached_inferiors_p (void);
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ptid_t thread_to_gdb_id (struct thread_info *);
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ptid_t gdb_id_to_thread_id (ptid_t);
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void clear_inferiors (void);
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struct inferior_list_entry *find_inferior
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(struct inferior_list *,
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int (*func) (struct inferior_list_entry *,
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void *),
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void *arg);
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struct inferior_list_entry *find_inferior_id (struct inferior_list *list,
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ptid_t id);
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void *inferior_target_data (struct thread_info *);
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void set_inferior_target_data (struct thread_info *, void *);
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struct regcache *inferior_regcache_data (struct thread_info *);
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void set_inferior_regcache_data (struct thread_info *, struct regcache *);
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#endif /* INFERIORS_H */
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