usr/src/cmd/mdb/common/kmdb/kvm_cpu.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * CPU-specific target implementation
  31  *
  32  * Each CPU provides a set of debugging facilities.  We have per-CPU "modules",
  33  * each of which exposes a kmt_cpu_t.  When initialized, these modules will
  34  * install dcmds, walkers, and the like in order to allow the user to take
  35  * advantage of features specific to the CPU being used.
  36  */
  37
  38 #include <kmdb/kmdb_kdi.h>
  39 #include <kmdb/kvm_cpu_impl.h>
  40 #include <mdb/mdb_target.h>
  41 #include <mdb/mdb_err.h>
  42 #include <mdb/mdb.h>
  43
  44 static kmt_cpu_ctor_f *const kmt_cpu_ctors[] = {
  45 #if defined(__i386) || defined(__amd64)
  46         kmt_cpu_amd_create,
  47         kmt_cpu_p4_create,
  48 #if defined(__i386)
  49         kmt_cpu_p6_create,
  50 #endif  /* __i386 */
  51 #endif  /* __i386 || __amd64 */
  52         NULL
  53 };
  54
  55 kmt_cpu_t *
  56 kmt_cpu_create(mdb_tgt_t *t)
  57 {
  58         kmt_cpu_t *cpu;
  59         int retry = 0;
  60         int i;
  61
  62         for (i = 0; kmt_cpu_ctors[i] != NULL; i++) {
  63                 if ((cpu = kmt_cpu_ctors[i](t)) != NULL)
  64                         return (cpu);
  65                 else if (errno == EAGAIN)
  66                         retry = 1;
  67         }
  68
  69         if (retry)
  70                 (void) set_errno(EAGAIN);
  71
  72         return (NULL);
  73 }
  74
  75 void
  76 kmt_cpu_destroy(kmt_cpu_t *cpu)
  77 {
  78         if (cpu != NULL)
  79                 cpu->kmt_cpu_ops->kco_destroy(cpu);
  80 }
  81
  82 int
  83 kmt_cpu_step_branch(mdb_tgt_t *t, kmt_cpu_t *cpu)
  84 {
  85         if (cpu == NULL || cpu->kmt_cpu_ops->kco_step_branch == NULL)
  86                 return (set_errno(EMDB_TGTHWNOTSUP));
  87
  88         return (cpu->kmt_cpu_ops->kco_step_branch(cpu, t));
  89 }
  90
  91 const char *
  92 kmt_cpu_name(kmt_cpu_t *cpu)
  93 {
  94         if (cpu == NULL)
  95                 return ("none");
  96         else
  97                 return (cpu->kmt_cpu_ops->kco_name(cpu));
  98 }