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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 *
25 * Copyright 2018 Joyent, Inc.
26 */
27
28 /*
29 * Kernel/Debugger Interface (KDI) routines. Called during debugger under
30 * various system states (boot, while running, while the debugger has control).
31 * Functions intended for use while the debugger has control may not grab any
32 * locks or perform any functions that assume the availability of other system
33 * services.
34 */
35
36 #include <sys/systm.h>
37 #include <sys/x86_archext.h>
38 #include <sys/kdi_impl.h>
39 #include <sys/smp_impldefs.h>
40 #include <sys/psm_types.h>
41 #include <sys/segments.h>
42 #include <sys/archsystm.h>
43 #include <sys/controlregs.h>
44 #include <sys/trap.h>
45 #include <sys/kobj.h>
46 #include <sys/kobj_impl.h>
47 #include <sys/clock_impl.h>
48
49 static void
50 kdi_system_claim(void)
51 {
52 lbolt_debug_entry();
53
54 psm_notifyf(PSM_DEBUG_ENTER);
55 }
56
57 static void
58 kdi_system_release(void)
59 {
60 psm_notifyf(PSM_DEBUG_EXIT);
61
62 lbolt_debug_return();
63 }
64
65 static cpu_t *
66 kdi_gdt2cpu(uintptr_t gdtbase)
67 {
68 cpu_t *cp = cpu_list;
69
70 if (cp == NULL)
71 return (NULL);
72
73 do {
74 if (gdtbase == (uintptr_t)cp->cpu_gdt)
75 return (cp);
76 } while ((cp = cp->cpu_next) != cpu_list);
77
78 return (NULL);
79 }
80
81 #if defined(__amd64)
82 uintptr_t
83 kdi_gdt2gsbase(uintptr_t gdtbase)
84 {
85 return ((uintptr_t)kdi_gdt2cpu(gdtbase));
86 }
87 #endif
88
89 static uintptr_t
90 kdi_get_userlimit(void)
91 {
92 return (_userlimit);
93 }
94
95 static int
96 kdi_get_cpuinfo(uint_t *vendorp, uint_t *familyp, uint_t *modelp)
97 {
98 desctbr_t gdtr;
99 cpu_t *cpu;
100
101 /*
102 * CPU doesn't work until the GDT and gs/GSBASE have been set up.
103 * Boot-loaded kmdb will call us well before then, so we have to
104 * find the current cpu_t the hard way.
105 */
106 rd_gdtr(&gdtr);
107 if ((cpu = kdi_gdt2cpu(gdtr.dtr_base)) == NULL ||
108 !cpuid_checkpass(cpu, 1))
109 return (EAGAIN); /* cpuid isn't done yet */
110
111 *vendorp = cpuid_getvendor(cpu);
112 *familyp = cpuid_getfamily(cpu);
113 *modelp = cpuid_getmodel(cpu);
114
115 return (0);
116 }
117
118 void
119 kdi_idtr_set(gate_desc_t *idt, size_t limit)
120 {
121 desctbr_t idtr;
122
123 /*
124 * This rare case could happen if we entered kmdb whilst still on the
125 * fake CPU set up by boot_kdi_tmpinit(). We're trying to restore the
126 * kernel's IDT that we saved on entry, but it was from the fake cpu_t
127 * rather than the real IDT (which is still boot's). It's unpleasant,
128 * but we just encode knowledge that it's idt0 we want to restore.
129 */
130 if (idt == NULL)
131 idt = idt0;
132
133 CPU->cpu_m.mcpu_idt = idt;
134 idtr.dtr_base = (uintptr_t)idt;
135 idtr.dtr_limit = limit;
136 kdi_idtr_write(&idtr);
137 }
138
139 static void
140 kdi_plat_call(void (*platfn)(void))
141 {
142 if (platfn != NULL)
143 platfn();
144 }
145
146 /*
147 * On Intel, most of these are shared between i86*, so this is really an
148 * arch_kdi_init().
149 */
150 void
151 mach_kdi_init(kdi_t *kdi)
152 {
153 kdi->kdi_plat_call = kdi_plat_call;
154 kdi->kdi_kmdb_enter = kmdb_enter;
155 kdi->mkdi_activate = kdi_activate;
156 kdi->mkdi_deactivate = kdi_deactivate;
157 kdi->mkdi_idt_switch = kdi_idt_switch;
158 kdi->mkdi_update_drreg = kdi_update_drreg;
159 kdi->mkdi_get_userlimit = kdi_get_userlimit;
160 kdi->mkdi_get_cpuinfo = kdi_get_cpuinfo;
161 kdi->mkdi_stop_slaves = kdi_stop_slaves;
162 kdi->mkdi_start_slaves = kdi_start_slaves;
163 kdi->mkdi_slave_wait = kdi_slave_wait;
164 kdi->mkdi_memrange_add = kdi_memrange_add;
165 kdi->mkdi_reboot = kdi_reboot;
166 }
167
168 void
169 plat_kdi_init(kdi_t *kdi)
170 {
171 kdi->pkdi_system_claim = kdi_system_claim;
172 kdi->pkdi_system_release = kdi_system_release;
173 }