Jumbo update to address several issues.
Go back to activating thread debugging in new_objfile(), as well as several other places, so that thread operations such as wait() can be handled inside of the child_ops.create_inferior(). This addresses spurious SIGTRAPs at the start of debugging threaded programs. Make use of the libpthread_dbg suspend/resume interface to implement single-thread stepping. Be a little more sensible about the way IS_LWP and IS_THREAD work. Don't try to look up mutex data for a spinlock sync object (ugh, unions).
This commit is contained in:
nathanw
parent
52efc390bf
commit
066d05318f
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@ -31,6 +31,7 @@
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "solib.h"
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#include "gdbthread.h"
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#include "bfd.h"
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#include "elf-bfd.h"
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@ -53,13 +54,17 @@ typedef struct fpreg fpregset_t;
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/* nbsd_thread_present indicates that new_objfile has spotted
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libpthread and that post_attach() or create_inferior() should fire
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up thread debugging. */
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up thread debugging if it isn't already active. */
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static int nbsd_thread_present = 0;
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/* nbsd_thread_active indicates that thread debugging is up and running, and
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in particular that main_ta and main_ptid are valid. */
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static int nbsd_thread_active = 0;
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/* nbsd_thread_core indicates that we're working on a corefile, not a
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live process. */
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static int nbsd_thread_core = 0;
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static ptid_t main_ptid; /* Real process ID */
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static ptid_t cached_thread;
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@ -85,7 +90,8 @@ static void nbsd_find_new_threads PARAMS ((void));
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#define GET_LWP(ptid) ptid_get_lwp (ptid)
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#define GET_THREAD(ptid) ptid_get_tid (ptid)
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#define IS_THREAD(ptid) (GET_LWP (ptid) == 0)
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#define IS_LWP(ptid) (GET_LWP (ptid) != 0)
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#define IS_THREAD(ptid) (GET_THREAD (ptid) != 0)
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#define BUILD_LWP(lwp, ptid) ptid_build (GET_PID(ptid), lwp, 0)
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#define BUILD_THREAD(tid, ptid) ptid_build (GET_PID(ptid), 0, tid)
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@ -96,7 +102,7 @@ static const char *syncnames[] = {"unknown",
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"mutex",
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"cond var",
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"spinlock",
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"joining thread"};
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"thread"};
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struct string_map
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{
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@ -137,58 +143,46 @@ td_err_string (int errcode)
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static void
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nbsd_thread_activate (void)
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{
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int val;
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ptid_t ptid;
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val = td_open (&nbsd_thread_callbacks, NULL, &main_ta);
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if (val != 0)
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error ("nbsd_thread_activate: td_open: %s",
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td_err_string (val));
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main_ptid = inferior_ptid;
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nbsd_thread_active = 1;
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main_ptid = inferior_ptid;
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cached_thread = minus_one_ptid;
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nbsd_find_new_threads ();
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ptid = find_active_thread ();
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if (ptid_equal (ptid, minus_one_ptid))
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error ("No active thread found\n");
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inferior_ptid = ptid;
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inferior_ptid = find_active_thread ();
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}
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static void
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nbsd_thread_deactivate (void)
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{
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td_close (main_ta);
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inferior_ptid = main_ptid;
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main_ptid = minus_one_ptid;
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cached_thread = main_ptid;
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nbsd_thread_active = 0;
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nbsd_thread_present = 0;
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init_thread_list ();
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td_close (main_ta);
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}
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static void
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nbsd_thread_attach (char *args, int from_tty)
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{
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nbsd_thread_core = 0;
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if (nbsd_thread_present && !nbsd_thread_active)
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push_target(&nbsd_thread_ops);
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child_ops.to_attach (args, from_tty);
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push_target (&nbsd_thread_ops);
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/* Must get symbols from solibs before libthread_db can run! */
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SOLIB_ADD ((char *) 0, from_tty, (struct target_ops *) 0, auto_solib_add);
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/* seems like a good place to activate, but isn't. Let it happen in
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nbsd_thread_post_attach(), after a wait has occurred. */
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}
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/* Attach to process PID, then initialize for debugging it
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and wait for the trace-trap that results from attaching. */
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static void
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nbsd_thread_post_attach (int pid)
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{
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int val;
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child_ops.to_post_attach (pid);
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if (nbsd_thread_present)
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if (nbsd_thread_present && !nbsd_thread_active)
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nbsd_thread_activate ();
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}
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@ -204,22 +198,110 @@ nbsd_thread_post_attach (int pid)
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static void
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nbsd_thread_detach (char *args, int from_tty)
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{
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if (nbsd_thread_active)
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nbsd_thread_deactivate ();
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nbsd_thread_deactivate ();
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unpush_target (&nbsd_thread_ops);
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/* Ordinairly, gdb caches solib information, but this means that it
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won't call the new_obfile hook on a reattach. Clear the symbol file
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cache so that attach -> detach -> attach works. */
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clear_solib();
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symbol_file_clear(0);
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child_ops.to_detach (args, from_tty);
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}
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static int nsusp;
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static int nsuspalloc;
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static td_thread_t **susp;
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static int
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thread_resume_suspend_cb (td_thread_t *th, void *arg)
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{
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int val;
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ptid_t *pt = arg;
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td_thread_info_t ti;
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if (td_thr_info (th, &ti) != 0)
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return -1;
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if ((ti.thread_id != GET_THREAD (*pt)) &&
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(ti.thread_type == TD_TYPE_USER) &&
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(ti.thread_state != TD_STATE_SUSPENDED) &&
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(ti.thread_state != TD_STATE_ZOMBIE))
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{
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val = td_thr_suspend(th);
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if (val != 0)
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error ("thread_resume_suspend_cb: td_thr_suspend(%p): %s", th,
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td_err_string (val));
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if (nsusp == nsuspalloc)
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{
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if (nsuspalloc == 0)
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{
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nsuspalloc = 32;
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susp = malloc (nsuspalloc * sizeof(td_thread_t *));
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if (susp == NULL)
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error ("thread_resume_suspend_cb: out of memory\n");
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}
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else
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{
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static td_thread_t **newsusp;
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nsuspalloc *= 2;
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newsusp = realloc (susp, nsuspalloc * sizeof(td_thread_t *));
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if (newsusp == NULL)
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error ("thread_resume_suspend_cb: out of memory\n");
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susp = newsusp;
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}
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}
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susp[nsusp] = th;
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nsusp++;
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}
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return 0;
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}
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static void
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nbsd_thread_resume (ptid_t ptid, int step, enum target_signal signo)
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{
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child_ops.to_resume (ptid, step, signo);
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/* If a particular ptid is specified, then gdb wants to resume or
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step just that thread. If it isn't on a processor, then it needs
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to be put on one, and nothing else can be on the runnable
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list. */
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if (GET_PID (ptid) != -1)
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{
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int i, val;
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val = td_thr_iter (main_ta, thread_resume_suspend_cb, &ptid);
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if (val != 0)
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error ("nbsd_thread_resume td_thr_iter: %s", td_err_string (val));
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child_ops.to_resume (ptid, step, signo);
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/* can't un-suspend just yet, child may not be stopped */
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}
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else
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child_ops.to_resume (ptid, step, signo);
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cached_thread = minus_one_ptid;
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}
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static void
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nbsd_thread_unsuspend(void)
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{
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int i, val;
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for (i = 0; i < nsusp; i++)
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{
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td_thread_info_t ti;
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td_thr_info(susp[i], &ti);
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val = td_thr_resume(susp[i]);
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if (val != 0)
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error ("nbsd_thread_resume: td_thr_suspend(%p): %s", susp[i],
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td_err_string (val));
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}
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nsusp = 0;
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}
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static ptid_t
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find_active_thread (void)
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{
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@ -269,6 +351,8 @@ nbsd_thread_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
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rtnval = child_ops.to_wait (ptid, ourstatus);
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nbsd_thread_unsuspend();
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if (nbsd_thread_active && (ourstatus->kind != TARGET_WAITKIND_EXITED))
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{
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rtnval = find_active_thread ();
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@ -447,7 +531,7 @@ nbsd_thread_new_objfile (struct objfile *objfile)
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if (!objfile)
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{
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nbsd_thread_present = 0;
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nbsd_thread_active = 0;
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goto quit;
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}
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@ -456,7 +540,7 @@ nbsd_thread_new_objfile (struct objfile *objfile)
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goto quit;
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/* Don't do anything if we've already fired up the debugging library */
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if (nbsd_thread_present)
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if (nbsd_thread_active)
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goto quit;
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/* Now, initialize the thread debugging library. This needs to be
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@ -470,16 +554,22 @@ nbsd_thread_new_objfile (struct objfile *objfile)
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warning ("target_new_objfile: td_open: %s", td_err_string (val));
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goto quit;
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}
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td_close (main_ta);
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nbsd_thread_present = 1;
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if ((nbsd_thread_core == 0) &&
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!ptid_equal (inferior_ptid, null_ptid))
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{
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push_target (&nbsd_thread_ops);
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nbsd_thread_activate();
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}
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quit:
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/* Call predecessor on chain, if any. */
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if (target_new_objfile_chain)
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target_new_objfile_chain (objfile);
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}
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static int
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nbsd_thread_alive (ptid_t ptid)
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{
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@ -501,7 +591,7 @@ nbsd_thread_alive (ptid_t ptid)
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val = 1;
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}
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}
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else
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else if (IS_LWP (ptid))
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{
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struct ptrace_lwpinfo pl;
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pl.pl_lwpid = GET_LWP (ptid);
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@ -511,6 +601,8 @@ nbsd_thread_alive (ptid_t ptid)
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else
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val = 1;
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}
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else
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val = child_ops.to_thread_alive (ptid);
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}
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else
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val = child_ops.to_thread_alive (ptid);
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@ -603,29 +695,15 @@ nbsd_thread_can_run (void)
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static void
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nbsd_thread_create_inferior (char *exec_file, char *allargs, char **env)
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{
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int val;
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nbsd_thread_core = 0;
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push_target (&nbsd_thread_ops);
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if (nbsd_thread_present && !nbsd_thread_active)
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push_target(&nbsd_thread_ops);
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child_ops.to_create_inferior (exec_file, allargs, env);
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if (!nbsd_thread_active && nbsd_thread_present && GET_PID(inferior_ptid) != 0)
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{
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nbsd_thread_activate ();
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#if 0
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/* This is gross. Due to the the differences in when the thread
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library gets initialized (static vs. dynamic binaries,
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mostly) and calls back to nbsd_thread_wait(), there's no
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decent way for the child_ops.to_create_inferior() routine to
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call back to us to start threads and find the right current
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thread before it prints out a stack frame. So we print out
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another stack frame here, after activating, to make sure that
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the user sees what we think is interesing. */
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flush_cached_frames ();
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select_frame (get_current_frame ());
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show_and_print_stack_frame (selected_frame, -1, 1);
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#endif
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}
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if (nbsd_thread_present && !nbsd_thread_active)
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nbsd_thread_activate();
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}
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@ -759,11 +837,13 @@ nbsd_thread_examine_cmd (char *exp, int from_tty)
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if (from_tty)
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*exp = 0;
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}
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else
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return;
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if ((ret = td_map_pth2thr (main_ta, (pthread_t) addr, &th)) != 0)
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error ("nbsd_thread_examine_command: td_map_pth2thr: %s",
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td_err_string (ret));
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td_err_string (ret));
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info_cb (th, NULL);
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}
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@ -791,6 +871,8 @@ nbsd_thread_sync_cmd (char *exp, int from_tty)
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if (from_tty)
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*exp = 0;
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}
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else
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return;
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if ((ret = td_map_addr2sync (main_ta, (caddr_t)addr, &ts)) != 0)
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error ("nbsd_thread_sync_cmd: td_map_addr2sync: %s", td_err_string (ret));
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@ -815,10 +897,7 @@ nbsd_thread_sync_cmd (char *exp, int from_tty)
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if (!tsi.sync_data.spin.locked)
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printf_filtered (" unlocked ");
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else
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{
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td_thr_info (tsi.sync_data.mutex.owner, &ti);
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printf_filtered (" locked (waiters not tracked)");
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}
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printf_filtered (" locked (waiters not tracked)");
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}
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else if (tsi.sync_type == TD_SYNC_JOIN)
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{
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@ -887,6 +966,8 @@ nbsd_core_open (char *filename, int from_tty)
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td_thread_t *thread;
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td_thread_info_t ti;
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nbsd_thread_core = 1;
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orig_core_ops.to_open (filename, from_tty);
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if (nbsd_thread_present)
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@ -901,7 +982,7 @@ nbsd_core_open (char *filename, int from_tty)
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nbsd_find_new_threads ();
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}
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else
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error ("target_new_objfile: td_open: %s", td_err_string (val));
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error ("nbsd_core_open: td_open: %s", td_err_string (val));
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}
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}
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@ -1138,8 +1219,8 @@ init_nbsd_core_ops (void)
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nbsd_core_ops.to_doc = "NetBSD pthread support for core files.";
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nbsd_core_ops.to_open = nbsd_core_open;
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nbsd_core_ops.to_close = nbsd_core_close;
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nbsd_core_ops.to_attach = nbsd_thread_attach;
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nbsd_core_ops.to_post_attach = nbsd_thread_post_attach;
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nbsd_core_ops.to_attach = 0;
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nbsd_core_ops.to_post_attach = 0;
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nbsd_core_ops.to_detach = nbsd_core_detach;
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/* nbsd_core_ops.to_resume = 0; */
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/* nbsd_core_ops.to_wait = 0; */
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Loading…
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