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 2006 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 * SPARC-specific portions of the DPI
31 */
32
33#include <sys/types.h>
34#include <sys/mmu.h>
35#include <sys/trap.h>
36#include <sys/machtrap.h>
37
38#include <kmdb/kmdb_dpi_impl.h>
39#include <kmdb/kmdb_asmutil.h>
40#include <kmdb/kmdb_promif.h>
41#include <kmdb/kmdb_fault.h>
42#include <mdb/mdb_err.h>
43#include <mdb/mdb_debug.h>
44#include <mdb/mdb_kreg.h>
45#include <mdb/mdb.h>
46
47void
48kmdb_dpi_handle_fault(kreg_t tt, kreg_t tpc, kreg_t tnpc, kreg_t sp, int cpuid)
49{
50	mdb_dprintf(MDB_DBG_DPI, "\ndpi_handle_fault: tt 0x%01lx, tpc 0x%0?p, "
51	    "tnpc 0x%0?p, sp 0x%0?p, fault_pcb 0x%0?p\n", tt, tpc, tnpc, sp,
52	    kmdb_dpi_fault_pcb);
53
54	switch (tt) {
55	case FAST_PROT_TT:
56		errno = EACCES;
57		break;
58	case T_DATA_ERROR:
59		errno = EIO;
60		break;
61#ifdef sun4v
62	case T_DATA_MMU_MISS:
63#endif /* sun4v */
64	case FAST_DMMU_MISS_TT:
65	default:
66		errno = EMDB_NOMAP;
67	}
68
69	if (kmdb_dpi_fault_pcb != NULL) {
70		longjmp(*kmdb_dpi_fault_pcb, 1);
71		/*NOTREACHED*/
72	}
73
74	/* Debugger fault */
75	kmdb_fault(tt, tpc, sp, cpuid);
76}
77
78int
79kmdb_dpi_get_register(const char *regname, kreg_t *kregp)
80{
81	return (mdb.m_dpi->dpo_get_register(regname, kregp));
82}
83
84int
85kmdb_dpi_set_register(const char *regname, kreg_t kreg)
86{
87	return (mdb.m_dpi->dpo_set_register(regname, kreg));
88}
89
90int
91kmdb_dpi_get_rwin(int cpuid, int win, struct rwindow *rwin)
92{
93	return (mdb.m_dpi->dpo_get_rwin(cpuid, win, rwin));
94}
95
96int
97kmdb_dpi_get_nwin(int cpuid)
98{
99	return (mdb.m_dpi->dpo_get_nwin(cpuid));
100}
101
102void
103kmdb_dpi_kernpanic(int cpuid)
104{
105	mdb.m_dpi->dpo_kernpanic(cpuid);
106}
107
108/*
109 * Continue/resume handling.  If the target calls kmdb_dpi_resume(), it
110 * expects that the world will be resumed, and that the call will return
111 * when the world has stopped again.
112 *
113 * For support, we have resume_return(), which is called from main() when
114 * the continuation has completed (when the world has stopped again).
115 * set_resume_exit() tells where to jump to actually restart the world.
116 *
117 * CAUTION: This routine may be called *after* mdb_destroy.
118 */
119void
120kmdb_dpi_resume_common(int cmd)
121{
122	kreg_t pc, tt;
123
124	ASSERT(kmdb_dpi_resume_requested == 0);
125
126	if (setjmp(kmdb_dpi_resume_pcb) == 0) {
127		(void) kmdb_dpi_get_register("pc", &pc);
128		mdb_dprintf(MDB_DBG_PROC, "Resume requested, pc is %p\n",
129		    (void *)pc);
130
131		if (cmd != KMDB_DPI_CMD_RESUME_UNLOAD)
132			kmdb_dpi_resume_requested = 1;
133
134		longjmp(kmdb_dpi_entry_pcb, cmd);
135		/*NOTREACHED*/
136
137	} else {
138		(void) kmdb_dpi_get_register("pc", &pc);
139		(void) kmdb_dpi_get_register("tt", &tt);
140		mdb_dprintf(MDB_DBG_PROC, "Back from resume, pc: %p, tt: %lx\n",
141		    (void *)pc, tt);
142
143		kmdb_dpi_resume_requested = 0;
144
145		switch (tt) {
146		case T_PA_WATCHPOINT:
147			kmdb_dpi_set_state(DPI_STATE_FAULTED,
148			    DPI_STATE_WHY_P_WAPT);
149			break;
150		case T_VA_WATCHPOINT:
151			kmdb_dpi_set_state(DPI_STATE_FAULTED,
152			    DPI_STATE_WHY_V_WAPT);
153			break;
154		case ST_KMDB_BREAKPOINT|T_SOFTWARE_TRAP:
155		case ST_MON_BREAKPOINT|T_SOFTWARE_TRAP: /* Shouldn't happen */
156			kmdb_dpi_set_state(DPI_STATE_FAULTED,
157			    DPI_STATE_WHY_BKPT);
158			break;
159		case ST_KMDB_TRAP|T_SOFTWARE_TRAP:
160			kmdb_dpi_set_state(DPI_STATE_STOPPED, 0);
161			break;
162		default:
163			kmdb_dpi_set_state(DPI_STATE_FAULTED,
164			    DPI_STATE_WHY_TRAP);
165			break;
166		}
167	}
168}
169