9210 remove KMDB branch debugging support
9211 ::crregs could do with cr2/cr3 support
9209 ::ttrace should be able to filter by thread
Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>

*** 19,28 ****
--- 19,30 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2013 by Delphix. All rights reserved.
+  *
+  * Copyright 2018 Joyent, Inc.
   */
  
  #include <kmdb/kmdb_kvm.h>
  #include <kmdb/kvm.h>
  #include <kmdb/kmdb_kdi.h>
*** 547,557 ****
  
  /*ARGSUSED*/
  static int
  kmt_status_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
-         kmt_data_t *kmt = mdb.m_target->t_data;
          struct utsname uts;
          char uuid[37];
          kreg_t tt;
  
          if (mdb_tgt_readsym(mdb.m_target, MDB_TGT_AS_VIRT, &uts, sizeof (uts),
--- 549,558 ----
*** 576,590 ****
          } else if (uuid[36] != '\0') {
                  (void) strcpy(uuid, "(invalid)");
          }
          mdb_printf("image uuid: %s\n", uuid);
  
-         if (kmt->kmt_cpu != NULL) {
-                 mdb_printf("CPU-specific support: %s\n",
-                     kmt_cpu_name(kmt->kmt_cpu));
-         }
- 
          mdb_printf("DTrace state: %s\n", (kmdb_kdi_dtrace_get_state() ==
              KDI_DTSTATE_DTRACE_ACTIVE ? "active (debugger breakpoints cannot "
              "be armed)" : "inactive"));
  
          (void) kmdb_dpi_get_register("tt", &tt);
--- 577,586 ----
*** 2390,2402 ****
                  kmt_defbp_destroy_all();
  
          if (kmt->kmt_trapmap != NULL)
                  mdb_free(kmt->kmt_trapmap, BT_SIZEOFMAP(kmt->kmt_trapmax));
  
-         if (kmt->kmt_cpu != NULL)
-                 kmt_cpu_destroy(kmt->kmt_cpu);
- 
          if (kmt != NULL)
                  mdb_free(kmt, sizeof (kmt_data_t));
  }
  
  static const mdb_tgt_ops_t kmt_ops = {
--- 2386,2395 ----
*** 2433,2443 ****
          kmt_name_to_ctf,                        /* t_name_to_ctf */
          kmt_status,                             /* t_status */
          (int (*)()) mdb_tgt_notsup,             /* t_run */
          kmt_step,                               /* t_step */
          kmt_step_out,                           /* t_step_out */
-         kmt_step_branch,                        /* t_step_branch */
          kmt_next,                               /* t_next */
          kmt_continue,                           /* t_cont */
          (int (*)()) mdb_tgt_notsup,             /* t_signal */
          kmt_add_vbrkpt,                         /* t_add_vbrkpt */
          kmt_add_sbrkpt,                         /* t_add_sbrkpt */
--- 2426,2435 ----
*** 2502,2515 ****
                   */
                  (void) kmt_defbp_activate(t);
                  (void) mdb_tgt_sespec_activate_all(t);
          }
  
-         if (kmt->kmt_cpu_retry && ((kmt->kmt_cpu = kmt_cpu_create(t)) !=
-             NULL || errno != EAGAIN))
-                 kmt->kmt_cpu_retry = FALSE;
- 
          (void) mdb_tgt_status(t, &t->t_status);
  }
  
  /*
   * This routine executes while the kernel is running.
--- 2494,2503 ----
*** 2534,2544 ****
          (void) mdb_nv_create(&kmt->kmt_modules, UM_SLEEP);
  
          kmt_init_isadep(t);
  
          kmt->kmt_symavail = FALSE;
-         kmt->kmt_cpu_retry = TRUE;
  
          bzero(&kmt_defbp_list, sizeof (mdb_list_t));
  
          return (0);
  
--- 2522,2531 ----