#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
+#include <sys/wait.h>
/* Return the name of a file that can be opened to get the symbols for
the child process identified by PID. */
return true;
}
+
+/* Resume execution of a specified PTID, that points to a process or a thread
+ within a process. If one thread is specified, all other threads are
+ suspended. If STEP is nonzero, single-step it. If SIGNAL is nonzero,
+ give it that signal. */
+
+static void
+nbsd_resume(nbsd_nat_target *target, ptid_t ptid, int step,
+ enum gdb_signal signal)
+{
+ int request;
+
+ gdb_assert (minus_one_ptid != ptid);
+
+ if (ptid.lwp_p ())
+ {
+ /* If ptid is a specific LWP, suspend all other LWPs in the process. */
+ inferior *inf = find_inferior_ptid (target, ptid);
+
+ for (thread_info *tp : inf->non_exited_threads ())
+ {
+ if (tp->ptid.lwp () == ptid.lwp ())
+ request = PT_RESUME;
+ else
+ request = PT_SUSPEND;
+
+ if (ptrace (request, tp->ptid.pid (), NULL, tp->ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ }
+ }
+ else
+ {
+ /* If ptid is a wildcard, resume all matching threads (they won't run
+ until the process is continued however). */
+ for (thread_info *tp : all_non_exited_threads (target, ptid))
+ if (ptrace (PT_RESUME, tp->ptid.pid (), NULL, tp->ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ }
+
+ if (step)
+ {
+ for (thread_info *tp : all_non_exited_threads (target, ptid))
+ if (ptrace (PT_SETSTEP, tp->ptid.pid (), NULL, tp->ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ }
+ else
+ {
+ for (thread_info *tp : all_non_exited_threads (target, ptid))
+ if (ptrace (PT_CLEARSTEP, tp->ptid.pid (), NULL, tp->ptid.lwp ()) == -1)
+ perror_with_name (("ptrace"));
+ }
+
+ if (catch_syscall_enabled () > 0)
+ request = PT_SYSCALL;
+ else
+ request = PT_CONTINUE;
+
+ /* An address of (void *)1 tells ptrace to continue from
+ where it was. If GDB wanted it to start some other way, we have
+ already written a new program counter value to the child. */
+ if (ptrace (request, ptid.pid (), (void *)1, gdb_signal_to_host (signal)) == -1)
+ perror_with_name (("ptrace"));
+}
+
+/* Resume execution of thread PTID, or all threads of all inferiors
+ if PTID is -1. If STEP is nonzero, single-step it. If SIGNAL is nonzero,
+ give it that signal. */
+
+void
+nbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
+{
+ if (minus_one_ptid != ptid)
+ nbsd_resume (this, ptid, step, signal);
+ else
+ {
+ for (inferior *inf : all_non_exited_inferiors (this))
+ nbsd_resume (this, ptid_t (inf->pid, 0, 0), step, signal);
+ }
+}
+
+/* Implement a safe wrapper around waitpid(). */
+
+static pid_t
+nbsd_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)
+{
+ pid_t pid;
+ int status;
+
+ set_sigint_trap ();
+
+ do
+ {
+ /* The common code passes WNOHANG that leads to crashes, overwrite it. */
+ pid = waitpid (ptid.pid (), &status, 0);
+ }
+ while (pid == -1 && errno == EINTR);
+
+ clear_sigint_trap ();
+
+ if (pid == -1)
+ perror_with_name (_("Child process unexpectedly missing"));
+
+ store_waitstatus (ourstatus, status);
+ return pid;
+}
+
+/* Wait for the child specified by PTID to do something. Return the
+ process ID of the child, or MINUS_ONE_PTID in case of error; store
+ the status in *OURSTATUS. */
+
+ptid_t
+nbsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
+ int target_options)
+{
+ pid_t pid = nbsd_wait (ptid, ourstatus, target_options);
+ ptid_t wptid = ptid_t (pid);
+
+ /* If the child stopped, keep investigating its status. */
+ if (ourstatus->kind != TARGET_WAITKIND_STOPPED)
+ return wptid;
+
+ /* Extract the event and thread that received a signal. */
+ ptrace_siginfo_t psi;
+ if (ptrace (PT_GET_SIGINFO, pid, &psi, sizeof (psi)) == -1)
+ perror_with_name (("ptrace"));
+
+ /* Pick child's siginfo_t. */
+ siginfo_t *si = &psi.psi_siginfo;
+
+ int lwp = psi.psi_lwpid;
+
+ int signo = si->si_signo;
+ const int code = si->si_code;
+
+ /* Construct PTID with a specified thread that received the event.
+ If a signal was targeted to the whole process, lwp is 0. */
+ wptid = ptid_t (pid, lwp, 0);
+
+ /* Bail out on non-debugger oriented signals.. */
+ if (signo != SIGTRAP)
+ return wptid;
+
+ /* Stop examining non-debugger oriented SIGTRAP codes. */
+ if (code <= SI_USER || code == SI_NOINFO)
+ return wptid;
+
+ if (in_thread_list (this, ptid_t (pid)))
+ thread_change_ptid (this, ptid_t (pid), wptid);
+
+ if (code == TRAP_EXEC)
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXECD;
+ ourstatus->value.execd_pathname = xstrdup (pid_to_exec_file (pid));
+ return wptid;
+ }
+
+ if (code == TRAP_TRACE)
+ {
+ /* Unhandled at this level. */
+ return wptid;
+ }
+
+ if (code == TRAP_SCE || code == TRAP_SCX)
+ {
+ int sysnum = si->si_sysnum;
+
+ if (!catch_syscall_enabled () || !catching_syscall_number (sysnum))
+ {
+ /* If the core isn't interested in this event, ignore it. */
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ return wptid;
+ }
+
+ ourstatus->kind =
+ (code == TRAP_SCE) ? TARGET_WAITKIND_SYSCALL_ENTRY :
+ TARGET_WAITKIND_SYSCALL_RETURN;
+ ourstatus->value.syscall_number = sysnum;
+ return wptid;
+ }
+
+ if (code == TRAP_BRKPT)
+ {
+ /* Unhandled at this level. */
+ return wptid;
+ }
+
+ /* Unclassified SIGTRAP event. */
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ return wptid;
+}
+
+/* Implement the "insert_exec_catchpoint" target_ops method. */
+
+int
+nbsd_nat_target::insert_exec_catchpoint (int pid)
+{
+ /* Nothing to do. */
+ return 0;
+}
+
+/* Implement the "remove_exec_catchpoint" target_ops method. */
+
+int
+nbsd_nat_target::remove_exec_catchpoint (int pid)
+{
+ /* Nothing to do. */
+ return 0;
+}
+
+/* Implement the "set_syscall_catchpoint" target_ops method. */
+
+int
+nbsd_nat_target::set_syscall_catchpoint (int pid, bool needed,
+ int any_count,
+ gdb::array_view<const int> syscall_counts)
+{
+ /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which
+ will catch all system call entries and exits. The system calls
+ are filtered by GDB rather than the kernel. */
+ return 0;
+}
projects / deliverable / binutils-gdb.git / blobdiff