/* Native debugging support for GNU/Linux (LWP layer).
- Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of GDB.
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"
+#ifndef LINUX_NAT_H
+#define LINUX_NAT_H
+#include "nat/linux-nat.h"
+#include "inf-ptrace.h"
+#include "target.h"
#include <signal.h>
+/* A prototype generic GNU/Linux target. A concrete instance should
+ override it with local methods. */
+
+class linux_nat_target : public inf_ptrace_target
+{
+public:
+ linux_nat_target ();
+ ~linux_nat_target () override = 0;
+
+ thread_control_capabilities get_thread_control_capabilities () override
+ { return tc_schedlock; }
+
+ void create_inferior (const char *, const std::string &,
+ char **, int) override;
+
+ void attach (const char *, int) override;
+
+ void detach (inferior *, int) override;
+
+ void resume (ptid_t, int, enum gdb_signal) override;
+
+ ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
+
+ void pass_signals (gdb::array_view<const unsigned char>) override;
+
+ enum target_xfer_status xfer_partial (enum target_object object,
+ const char *annex,
+ gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len) override;
+
+ void kill () override;
+
+ void mourn_inferior () override;
+ bool thread_alive (ptid_t ptid) override;
+
+ void update_thread_list () override;
+
+ std::string pid_to_str (ptid_t) override;
+
+ const char *thread_name (struct thread_info *) override;
+
+ struct address_space *thread_address_space (ptid_t) override;
+
+ bool stopped_by_watchpoint () override;
+
+ bool stopped_data_address (CORE_ADDR *) override;
+
+ bool stopped_by_sw_breakpoint () override;
+ bool supports_stopped_by_sw_breakpoint () override;
+
+ bool stopped_by_hw_breakpoint () override;
+ bool supports_stopped_by_hw_breakpoint () override;
+
+ void thread_events (int) override;
+
+ bool can_async_p () override;
+ bool is_async_p () override;
+
+ bool supports_non_stop () override;
+ bool always_non_stop_p () override;
+
+ int async_wait_fd () override;
+ void async (int) override;
+
+ void close () override;
+
+ void stop (ptid_t) override;
+
+ bool supports_multi_process () override;
+
+ bool supports_disable_randomization () override;
+
+ int core_of_thread (ptid_t ptid) override;
+
+ bool filesystem_is_local () override;
+
+ int fileio_open (struct inferior *inf, const char *filename,
+ int flags, int mode, int warn_if_slow,
+ int *target_errno) override;
+
+ gdb::optional<std::string>
+ fileio_readlink (struct inferior *inf,
+ const char *filename,
+ int *target_errno) override;
+
+ int fileio_unlink (struct inferior *inf,
+ const char *filename,
+ int *target_errno) override;
+
+ int insert_fork_catchpoint (int) override;
+ int remove_fork_catchpoint (int) override;
+ int insert_vfork_catchpoint (int) override;
+ int remove_vfork_catchpoint (int) override;
+
+ int insert_exec_catchpoint (int) override;
+ int remove_exec_catchpoint (int) override;
+
+ int set_syscall_catchpoint (int pid, bool needed, int any_count,
+ gdb::array_view<const int> syscall_counts) override;
+
+ char *pid_to_exec_file (int pid) override;
+
+ void post_startup_inferior (ptid_t) override;
+
+ void post_attach (int) override;
+
+ int follow_fork (int, int) override;
+
+ std::vector<static_tracepoint_marker>
+ static_tracepoint_markers_by_strid (const char *id) override;
+
+ /* Methods that are meant to overridden by the concrete
+ arch-specific target instance. */
+
+ virtual void low_resume (ptid_t ptid, int step, enum gdb_signal sig)
+ { inf_ptrace_target::resume (ptid, step, sig); }
+
+ virtual bool low_stopped_by_watchpoint ()
+ { return false; }
+
+ virtual bool low_stopped_data_address (CORE_ADDR *addr_p)
+ { return false; }
+
+ /* The method to call, if any, when a new thread is attached. */
+ virtual void low_new_thread (struct lwp_info *)
+ {}
+
+ /* The method to call, if any, when a thread is destroyed. */
+ virtual void low_delete_thread (struct arch_lwp_info *lp)
+ {
+ gdb_assert (lp == NULL);
+ }
+
+ /* The method to call, if any, when a new fork is attached. */
+ virtual void low_new_fork (struct lwp_info *parent, pid_t child_pid)
+ {}
+
+ /* The method to call, if any, when a process is no longer
+ attached. */
+ virtual void low_forget_process (pid_t pid)
+ {}
+
+ /* Hook to call prior to resuming a thread. */
+ virtual void low_prepare_to_resume (struct lwp_info *)
+ {}
+
+ /* Convert a ptrace/host siginfo object, into/from the siginfo in
+ the layout of the inferiors' architecture. Returns true if any
+ conversion was done; false otherwise, in which case the caller
+ does a straight memcpy. If DIRECTION is 1, then copy from INF to
+ PTRACE. If DIRECTION is 0, copy from PTRACE to INF. */
+ virtual bool low_siginfo_fixup (siginfo_t *ptrace, gdb_byte *inf,
+ int direction)
+ { return false; }
+
+ /* SIGTRAP-like breakpoint status events recognizer. The default
+ recognizes SIGTRAP only. */
+ virtual bool low_status_is_event (int status);
+};
+
+/* The final/concrete instance. */
+extern linux_nat_target *linux_target;
+
+struct arch_lwp_info;
+
/* Structure describing an LWP. This is public only for the purposes
of ALL_LWPS; target-specific code should generally not access it
directly. */
and overall process id. */
ptid_t ptid;
- /* Non-zero if this LWP is cloned. In this context "cloned" means
- that the LWP is reporting to its parent using a signal other than
- SIGCHLD. */
- int cloned;
+ /* If this flag is set, we need to set the event request flags the
+ next time we see this LWP stop. */
+ int must_set_ptrace_flags;
/* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
it back yet). */
didn't try to let the LWP run. */
int resumed;
+ /* The last resume GDB requested on this thread. */
+ enum resume_kind last_resume_kind;
+
/* If non-zero, a pending wait status. */
int status;
+ /* When 'stopped' is set, this is where the lwp last stopped, with
+ decr_pc_after_break already accounted for. If the LWP is
+ running, and stepping, this is the address at which the lwp was
+ resumed (that is, it's the previous stop PC). If the LWP is
+ running and not stepping, this is 0. */
+ CORE_ADDR stop_pc;
+
/* Non-zero if we were stepping this LWP. */
int step;
- /* Non-zero si_signo if this LWP stopped with a trap. si_addr may
- be the address of a hardware watchpoint. */
- struct siginfo siginfo;
+ /* The reason the LWP last stopped, if we need to track it
+ (breakpoint, watchpoint, etc.) */
+ enum target_stop_reason stop_reason;
+
+ /* On architectures where it is possible to know the data address of
+ a triggered watchpoint, STOPPED_DATA_ADDRESS_P is non-zero, and
+ STOPPED_DATA_ADDRESS contains such data address. Otherwise,
+ STOPPED_DATA_ADDRESS_P is false, and STOPPED_DATA_ADDRESS is
+ undefined. Only valid if STOPPED_BY_WATCHPOINT is true. */
+ int stopped_data_address_p;
+ CORE_ADDR stopped_data_address;
/* Non-zero if we expect a duplicated SIGINT. */
int ignore_sigint;
or to a local variable in lin_lwp_wait. */
struct target_waitstatus waitstatus;
- /* Next LWP in list. */
+ /* Signal whether we are in a SYSCALL_ENTRY or
+ in a SYSCALL_RETURN event.
+ Values:
+ - TARGET_WAITKIND_SYSCALL_ENTRY
+ - TARGET_WAITKIND_SYSCALL_RETURN */
+ enum target_waitkind syscall_state;
+
+ /* The processor core this LWP was last seen on. */
+ int core;
+
+ /* Arch-specific additions. */
+ struct arch_lwp_info *arch_private;
+
+ /* Previous and next pointers in doubly-linked list of known LWPs,
+ sorted by reverse creation order. */
+ struct lwp_info *prev;
struct lwp_info *next;
};
native target is active. */
extern struct lwp_info *lwp_list;
-/* Iterate over the PTID each active thread (light-weight process). There
- must be at least one. */
-#define ALL_LWPS(LP, PTID) \
- for ((LP) = lwp_list, (PTID) = (LP)->ptid; \
- (LP) != NULL; \
- (LP) = (LP)->next, (PTID) = (LP) ? (LP)->ptid : (PTID))
+/* Does the current host support PTRACE_GETREGSET? */
+extern enum tribool have_ptrace_getregset;
-#define GET_LWP(ptid) ptid_get_lwp (ptid)
-#define GET_PID(ptid) ptid_get_pid (ptid)
-#define is_lwp(ptid) (GET_LWP (ptid) != 0)
-#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
+/* Iterate over each active thread (light-weight process). */
+#define ALL_LWPS(LP) \
+ for ((LP) = lwp_list; \
+ (LP) != NULL; \
+ (LP) = (LP)->next)
/* Attempt to initialize libthread_db. */
void check_for_thread_db (void);
-int thread_db_attach_lwp (ptid_t ptid);
-
-/* Find process PID's pending signal set from /proc/pid/status. */
-void linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored);
-
-/* linux-nat functions for handling fork events. */
-extern void linux_enable_event_reporting (ptid_t ptid);
-
-extern int lin_lwp_attach_lwp (ptid_t ptid);
+/* Called from the LWP layer to inform the thread_db layer that PARENT
+ spawned CHILD. Both LWPs are currently stopped. This function
+ does whatever is required to have the child LWP under the
+ thread_db's control --- e.g., enabling event reporting. Returns
+ true on success, false if the process isn't using libpthread. */
+extern int thread_db_notice_clone (ptid_t parent, ptid_t child);
-/* Iterator function for lin-lwp's lwp list. */
-struct lwp_info *iterate_over_lwps (int (*callback) (struct lwp_info *,
- void *),
- void *data);
+/* Return the set of signals used by the threads library. */
+extern void lin_thread_get_thread_signals (sigset_t *mask);
-/* Create a prototype generic GNU/Linux target. The client can
- override it with local methods. */
-struct target_ops * linux_target (void);
-
-/* Create a generic GNU/Linux target using traditional
- ptrace register access. */
-struct target_ops *
-linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
+/* Find process PID's pending signal set from /proc/pid/status. */
+void linux_proc_pending_signals (int pid, sigset_t *pending,
+ sigset_t *blocked, sigset_t *ignored);
-/* Register the customized GNU/Linux target. This should be used
- instead of calling add_target directly. */
-void linux_nat_add_target (struct target_ops *);
+/* For linux_stop_lwp see nat/linux-nat.h. */
-/* Register a method to call whenever a new thread is attached. */
-void linux_nat_set_new_thread (struct target_ops *, void (*) (ptid_t));
+/* Stop all LWPs, synchronously. (Any events that trigger while LWPs
+ are being stopped are left pending.) */
+extern void linux_stop_and_wait_all_lwps (void);
-/* Register a method that converts a siginfo object between the layout
- that ptrace returns, and the layout in the architecture of the
- inferior. */
-void linux_nat_set_siginfo_fixup (struct target_ops *,
- int (*) (struct siginfo *,
- gdb_byte *,
- int));
+/* Set resumed LWPs running again, as they were before being stopped
+ with linux_stop_and_wait_all_lwps. (LWPS with pending events are
+ left stopped.) */
+extern void linux_unstop_all_lwps (void);
/* Update linux-nat internal state when changing from one fork
to another. */
void linux_nat_switch_fork (ptid_t new_ptid);
-/* Return the saved siginfo associated with PTID. */
-struct siginfo *linux_nat_get_siginfo (ptid_t ptid);
+/* Store the saved siginfo associated with PTID in *SIGINFO.
+ Return 1 if it was retrieved successfully, 0 otherwise (*SIGINFO is
+ uninitialized in such case). */
+int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
+
+#endif /* LINUX_NAT_H */
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