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 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 /*
29 * Intel-specific portions of the DPI
30 */
31
32 #include <sys/types.h>
33 #include <sys/trap.h>
34
35 #include <kmdb/kmdb_dpi_impl.h>
36 #include <kmdb/kmdb_fault.h>
37 #include <kmdb/kmdb_kdi.h>
38 #include <mdb/mdb_err.h>
39 #include <mdb/mdb_debug.h>
40 #include <mdb/mdb_kreg.h>
41 #include <mdb/mdb.h>
42
43 void
kmdb_dpi_handle_fault(kreg_t trapno,kreg_t pc,kreg_t sp,int cpuid)44 kmdb_dpi_handle_fault(kreg_t trapno, kreg_t pc, kreg_t sp, int cpuid)
45 {
46 kmdb_kdi_system_claim();
47
48 mdb_dprintf(MDB_DBG_DPI, "\ndpi_handle_fault: trapno %u, pc 0x%0?p, "
49 "sp 0x%0?p\n", (int)trapno, pc, sp);
50
51 switch (trapno) {
52 case T_GPFLT:
53 errno = EACCES;
54 default:
55 errno = EMDB_NOMAP;
56 }
57
58 if (kmdb_dpi_fault_pcb != NULL) {
59 longjmp(*kmdb_dpi_fault_pcb, 1);
60 /*NOTREACHED*/
61 }
62
63 /* Debugger fault */
64 kmdb_fault(trapno, pc, sp, cpuid);
65 }
66
67 /*ARGSUSED*/
68 int
kmdb_dpi_get_register(const char * regname,kreg_t * kregp)69 kmdb_dpi_get_register(const char *regname, kreg_t *kregp)
70 {
71 return (mdb.m_dpi->dpo_get_register(regname, kregp));
72 }
73
74 /*ARGSUSED*/
75 int
kmdb_dpi_set_register(const char * regname,kreg_t kreg)76 kmdb_dpi_set_register(const char *regname, kreg_t kreg)
77 {
78 return (mdb.m_dpi->dpo_set_register(regname, kreg));
79 }
80
81 /*
82 * Continue/resume handling. If the target calls kmdb_dpi_resume(), it
83 * expects that the world will be resumed, and that the call will return
84 * when the world has stopped again.
85 *
86 * For support, we have resume_return(), which is called from main() when
87 * the continuation has completed (when the world has stopped again).
88 * set_resume_exit() tells where to jump to actually restart the world.
89 *
90 * CAUTION: This routine may be called *after* mdb_destroy.
91 */
92 void
kmdb_dpi_resume_common(int cmd)93 kmdb_dpi_resume_common(int cmd)
94 {
95 kreg_t pc, trapno;
96
97 ASSERT(kmdb_dpi_resume_requested == 0);
98
99 if (setjmp(kmdb_dpi_resume_pcb) == 0) {
100 (void) kmdb_dpi_get_register("pc", &pc);
101 mdb_dprintf(MDB_DBG_PROC, "Resume requested, pc is %p\n",
102 (void *)pc);
103
104 if (cmd != KMDB_DPI_CMD_RESUME_UNLOAD)
105 kmdb_dpi_resume_requested = 1;
106
107 longjmp(kmdb_dpi_entry_pcb, cmd);
108 /*NOTREACHED*/
109
110 } else {
111 (void) kmdb_dpi_get_register("pc", &pc);
112 (void) kmdb_dpi_get_register("trapno", &trapno);
113 mdb_dprintf(MDB_DBG_PROC, "Back from resume, pc: %p, "
114 "trapno: %u\n", (void *)pc, (int)trapno);
115
116 kmdb_dpi_resume_requested = 0;
117
118 switch (trapno) {
119 case T_BPTFLT:
120 kmdb_dpi_set_state(DPI_STATE_FAULTED,
121 DPI_STATE_WHY_BKPT);
122 break;
123 case T_DBGENTR:
124 kmdb_dpi_set_state(DPI_STATE_STOPPED, 0);
125 break;
126 default:
127 kmdb_dpi_set_state(DPI_STATE_FAULTED,
128 DPI_STATE_WHY_TRAP);
129 break;
130 }
131 }
132
133 mdb_dprintf(MDB_DBG_PROC, "returning from resume\n");
134 }
135
136 void
kmdb_dpi_reboot(void)137 kmdb_dpi_reboot(void)
138 {
139 /*
140 * We're going to skip all of the niceties we employ in resume_common,
141 * as we don't plan to ever return.
142 */
143 longjmp(kmdb_dpi_entry_pcb, KMDB_DPI_CMD_REBOOT);
144 }
145
146 void
kmdb_dpi_msr_add(const kdi_msr_t * msrs)147 kmdb_dpi_msr_add(const kdi_msr_t *msrs)
148 {
149 mdb.m_dpi->dpo_msr_add(msrs);
150 }
151
152 uint64_t
kmdb_dpi_msr_get(uint_t msr)153 kmdb_dpi_msr_get(uint_t msr)
154 {
155 return (mdb.m_dpi->dpo_msr_get(DPI_MASTER_CPUID, msr));
156 }
157
158 uint64_t
kmdb_dpi_msr_get_by_cpu(int cpuid,uint_t msr)159 kmdb_dpi_msr_get_by_cpu(int cpuid, uint_t msr)
160 {
161 return (mdb.m_dpi->dpo_msr_get(cpuid, msr));
162 }
163