kernel/os/kdi.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <sys/cpuvar.h>
  27 #include <sys/kdi_impl.h>
  28 #include <sys/reboot.h>
  29 #include <sys/errno.h>
  30 #include <sys/atomic.h>
  31 #include <sys/kmem.h>
  32
  33 kdi_debugvec_t  *kdi_dvec;
  34 struct modctl   *kdi_dmods;
  35
  36 static kdi_dtrace_state_t kdi_dtrace_state = KDI_DTSTATE_IDLE;
  37
  38 void
  39 kdi_dvec_vmready(void)
  40 {
  41         kdi_dvec->dv_kctl_vmready();
  42         kdi_dvec->dv_vmready();
  43 }
  44
  45 void
  46 kdi_dvec_memavail(void)
  47 {
  48         /*
  49          * The driver will allocate more memory (if requested), and will call
  50          * dv_memavail itself.
  51          */
  52         kdi_dvec->dv_kctl_memavail();
  53 }
  54
  55 #if defined(__x86)
  56 void
  57 kdi_dvec_handle_fault(greg_t trapno, greg_t pc, greg_t sp, int cpuid)
  58 {
  59         kdi_dvec->dv_handle_fault(trapno, pc, sp, cpuid);
  60 }
  61 #endif
  62
  63
  64 void
  65 kdi_dvec_modavail(void)
  66 {
  67         kdi_dvec->dv_kctl_modavail();
  68 }
  69
  70 void
  71 kdi_dvec_thravail(void)
  72 {
  73         kdi_dvec->dv_kctl_thravail();
  74 }
  75
  76 void
  77 kdi_dvec_mod_loaded(struct modctl *modp)
  78 {
  79         kdi_dvec->dv_mod_loaded(modp);
  80 }
  81
  82 void
  83 kdi_dvec_mod_unloading(struct modctl *modp)
  84 {
  85         kdi_dvec->dv_mod_unloading(modp);
  86 }
  87
  88 kdi_dtrace_state_t
  89 kdi_dtrace_get_state(void)
  90 {
  91         return (kdi_dtrace_state);
  92 }
  93
  94 int
  95 kdi_dtrace_set(kdi_dtrace_set_t transition)
  96 {
  97         kdi_dtrace_state_t new, cur;
  98
  99         do {
 100                 cur = kdi_dtrace_state;
 101
 102                 switch (transition) {
 103                 case KDI_DTSET_DTRACE_ACTIVATE:
 104                         if (cur == KDI_DTSTATE_KMDB_BPT_ACTIVE)
 105                                 return (EBUSY);
 106                         if (cur == KDI_DTSTATE_DTRACE_ACTIVE)
 107                                 return (0);
 108                         new = KDI_DTSTATE_DTRACE_ACTIVE;
 109                         break;
 110                 case KDI_DTSET_DTRACE_DEACTIVATE:
 111                         if (cur == KDI_DTSTATE_KMDB_BPT_ACTIVE)
 112                                 return (EBUSY);
 113                         if (cur == KDI_DTSTATE_IDLE)
 114                                 return (0);
 115                         new = KDI_DTSTATE_IDLE;
 116                         break;
 117                 case KDI_DTSET_KMDB_BPT_ACTIVATE:
 118                         if (cur == KDI_DTSTATE_DTRACE_ACTIVE)
 119                                 return (EBUSY);
 120                         if (cur == KDI_DTSTATE_KMDB_BPT_ACTIVE)
 121                                 return (0);
 122                         new = KDI_DTSTATE_KMDB_BPT_ACTIVE;
 123                         break;
 124                 case KDI_DTSET_KMDB_BPT_DEACTIVATE:
 125                         if (cur == KDI_DTSTATE_DTRACE_ACTIVE)
 126                                 return (EBUSY);
 127                         if (cur == KDI_DTSTATE_IDLE)
 128                                 return (0);
 129                         new = KDI_DTSTATE_IDLE;
 130                         break;
 131                 default:
 132                         return (EINVAL);
 133                 }
 134         } while (atomic_cas_32((uint_t *)&kdi_dtrace_state, cur, new) != cur);
 135
 136         return (0);
 137 }