/* Native debugging support for GNU/Linux (LWP layer).
- Copyright (C) 2000-2015 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/>. */
+#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;
+
+ bool follow_fork (bool, bool) 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 new clone event is detected. */
+ virtual void low_new_clone (struct lwp_info *parent, pid_t child_lwp)
+ {}
+
+ /* 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
next time we see this LWP stop. */
int must_set_ptrace_flags;
- /* 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;
-
/* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
it back yet). */
int signalled;
/* 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
+ 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;
int step;
/* The reason the LWP last stopped, if we need to track it
- (breakpoint, watchpoint, etc.) */
+ (breakpoint, watchpoint, etc.). */
enum target_stop_reason stop_reason;
/* On architectures where it is possible to know the data address of
or to a local variable in lin_lwp_wait. */
struct target_waitstatus waitstatus;
- /* Signal wether we are in a SYSCALL_ENTRY or
+ /* Signal whether we are in a SYSCALL_ENTRY or
in a SYSCALL_RETURN event.
Values:
- TARGET_WAITKIND_SYSCALL_ENTRY
- TARGET_WAITKIND_SYSCALL_RETURN */
- int syscall_state;
+ 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;
- /* Next LWP in list. */
+ /* 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;
+/* Does the current host support PTRACE_GETREGSET? */
+extern enum tribool have_ptrace_getregset;
+
/* Iterate over each active thread (light-weight process). */
#define ALL_LWPS(LP) \
for ((LP) = lwp_list; \
void linux_proc_pending_signals (int pid, sigset_t *pending,
sigset_t *blocked, sigset_t *ignored);
-extern int lin_lwp_attach_lwp (ptid_t ptid);
-
-extern void linux_stop_lwp (struct lwp_info *lwp);
+/* For linux_stop_lwp see nat/linux-nat.h. */
/* Stop all LWPs, synchronously. (Any events that trigger while LWPs
are being stopped are left pending.) */
left stopped.) */
extern void linux_unstop_all_lwps (void);
-/* 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));
-
-/* Register the customized GNU/Linux target. This should be used
- instead of calling add_target directly. */
-void linux_nat_add_target (struct target_ops *);
-
-/* Register a method to call whenever a new thread is attached. */
-void linux_nat_set_new_thread (struct target_ops *, void (*) (struct lwp_info *));
-
-
-/* Register a method to call whenever a new fork is attached. */
-typedef void (linux_nat_new_fork_ftype) (struct lwp_info *parent,
- pid_t child_pid);
-void linux_nat_set_new_fork (struct target_ops *ops,
- linux_nat_new_fork_ftype *fn);
-
-/* Register a method to call whenever a process is killed or
- detached. */
-typedef void (linux_nat_forget_process_ftype) (pid_t pid);
-void linux_nat_set_forget_process (struct target_ops *ops,
- linux_nat_forget_process_ftype *fn);
-
-/* Call the method registered with the function above. PID is the
- process to forget about. */
-void linux_nat_forget_process (pid_t pid);
-
-/* 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 (*) (siginfo_t *,
- gdb_byte *,
- int));
-
-/* Register a method to call prior to resuming a thread. */
-
-void linux_nat_set_prepare_to_resume (struct target_ops *,
- void (*) (struct lwp_info *));
-
/* Update linux-nat internal state when changing from one fork
to another. */
void linux_nat_switch_fork (ptid_t new_ptid);
uninitialized in such case). */
int linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo);
-/* Set alternative SIGTRAP-like events recognizer. */
-void linux_nat_set_status_is_event (struct target_ops *t,
- int (*status_is_event) (int status));
+#endif /* LINUX_NAT_H */
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