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 * Copyright 2018 Joyent, Inc.
26 */
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 break;
55 default:
56 errno = EMDB_NOMAP;
57 }
58
59 if (kmdb_dpi_fault_pcb != NULL) {
60 longjmp(*kmdb_dpi_fault_pcb, 1);
61 /*NOTREACHED*/
62 }
63
64 /* Debugger fault */
65 kmdb_fault(trapno, pc, sp, cpuid);
66 }
67
68 /*ARGSUSED*/
69 int
kmdb_dpi_get_register(const char * regname,kreg_t * kregp)70 kmdb_dpi_get_register(const char *regname, kreg_t *kregp)
71 {
72 return (mdb.m_dpi->dpo_get_register(regname, kregp));
73 }
74
75 /*ARGSUSED*/
76 int
kmdb_dpi_set_register(const char * regname,kreg_t kreg)77 kmdb_dpi_set_register(const char *regname, kreg_t kreg)
78 {
79 return (mdb.m_dpi->dpo_set_register(regname, kreg));
80 }
81
82 /*
83 * Continue/resume handling. If the target calls kmdb_dpi_resume(), it
84 * expects that the world will be resumed, and that the call will return
85 * when the world has stopped again.
86 *
87 * For support, we have resume_return(), which is called from main() when
88 * the continuation has completed (when the world has stopped again).
89 * set_resume_exit() tells where to jump to actually restart the world.
90 *
91 * CAUTION: This routine may be called *after* mdb_destroy.
92 */
93 void
kmdb_dpi_resume_common(int cmd)94 kmdb_dpi_resume_common(int cmd)
95 {
96 kreg_t pc, trapno;
97
98 ASSERT(kmdb_dpi_resume_requested == 0);
99
100 if (setjmp(kmdb_dpi_resume_pcb) == 0) {
101 (void) kmdb_dpi_get_register("pc", &pc);
102 mdb_dprintf(MDB_DBG_PROC, "Resume requested, pc is %p\n",
103 (void *)pc);
104
105 if (cmd != KMDB_DPI_CMD_RESUME_UNLOAD)
106 kmdb_dpi_resume_requested = 1;
107
108 longjmp(kmdb_dpi_entry_pcb, cmd);
109 /*NOTREACHED*/
110
111 } else {
112 (void) kmdb_dpi_get_register("pc", &pc);
113 (void) kmdb_dpi_get_register("trapno", &trapno);
114 mdb_dprintf(MDB_DBG_PROC, "Back from resume, pc: %p, "
115 "trapno: %u\n", (void *)pc, (int)trapno);
116
117 kmdb_dpi_resume_requested = 0;
118
119 switch (trapno) {
120 case T_BPTFLT:
121 kmdb_dpi_set_state(DPI_STATE_FAULTED,
122 DPI_STATE_WHY_BKPT);
123 break;
124 case T_DBGENTR:
125 kmdb_dpi_set_state(DPI_STATE_STOPPED, 0);
126 break;
127 default:
128 kmdb_dpi_set_state(DPI_STATE_FAULTED,
129 DPI_STATE_WHY_TRAP);
130 break;
131 }
132 }
133
134 mdb_dprintf(MDB_DBG_PROC, "returning from resume\n");
135 }
136
137 void
kmdb_dpi_reboot(void)138 kmdb_dpi_reboot(void)
139 {
140 /*
141 * We're going to skip all of the niceties we employ in resume_common,
142 * as we don't plan to ever return.
143 */
144 longjmp(kmdb_dpi_entry_pcb, KMDB_DPI_CMD_REBOOT);
145 }
146