1 /* $NetBSD: kvm_arm.c,v 1.7 2022/01/10 19:51:30 christos Exp $ */
2
3 /*-
4 * Copyright (C) 1996 Wolfgang Solfrank.
5 * Copyright (C) 1996 TooLs GmbH.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * from: kvm_powerpc.c,v 1.3 1997/09/19 04:00:23 thorpej Exp
34 */
35
36 /*
37 * arm32 machine dependent routines for kvm.
38 */
39
40 #include <sys/cdefs.h>
41 #if defined(LIBC_SCCS) && !defined(lint)
42 __RCSID("$NetBSD: kvm_arm.c,v 1.7 2022/01/10 19:51:30 christos Exp $");
43 #endif /* LIBC_SCCS and not lint */
44
45 #include <sys/param.h>
46 #include <sys/exec.h>
47 #include <sys/kcore.h>
48 #include <sys/types.h>
49
50 #include <arm/kcore.h>
51 #include <arm/arm32/pte.h>
52
53 #include <stdlib.h>
54 #include <db.h>
55 #include <limits.h>
56 #include <kvm.h>
57
58 #include <unistd.h>
59
60 #include "kvm_private.h"
61
62 void
_kvm_freevtop(kvm_t * kd)63 _kvm_freevtop(kvm_t * kd)
64 {
65 if (kd->vmst != 0)
66 free(kd->vmst);
67 }
68
69 int
_kvm_initvtop(kvm_t * kd)70 _kvm_initvtop(kvm_t * kd)
71 {
72 return 0;
73 }
74
75 int
_kvm_kvatop(kvm_t * kd,vaddr_t va,paddr_t * pa)76 _kvm_kvatop(kvm_t * kd, vaddr_t va, paddr_t *pa)
77 {
78 cpu_kcore_hdr_t *cpu_kh;
79 pd_entry_t pde;
80 pt_entry_t pte;
81 paddr_t pde_pa, pte_pa;
82
83 if (ISALIVE(kd)) {
84 _kvm_err(kd, 0, "vatop called in live kernel!");
85 return (0);
86 }
87 cpu_kh = kd->cpu_data;
88
89 if (cpu_kh->version != 1) {
90 _kvm_err(kd, 0, "unsupported kcore structure version");
91 return 0;
92 }
93 if (cpu_kh->flags != 0) {
94 _kvm_err(kd, 0, "kcore flags not supported");
95 return 0;
96 }
97 /*
98 * work out which L1 table we need
99 */
100 if (va >= (cpu_kh->UserL1TableSize << 17))
101 pde_pa = cpu_kh->PAKernelL1Table;
102 else
103 pde_pa = cpu_kh->PAUserL1Table;
104
105 /*
106 * work out the offset into the L1 Table
107 */
108 pde_pa += ((va >> 20) * sizeof(pd_entry_t));
109
110 if (_kvm_pread(kd, kd->pmfd, (void *) &pde, sizeof(pd_entry_t),
111 _kvm_pa2off(kd, pde_pa)) != sizeof(pd_entry_t)) {
112 _kvm_syserr(kd, 0, "could not read L1 entry");
113 return (0);
114 }
115 /*
116 * next work out what kind of record it is
117 */
118 switch (pde & L1_TYPE_MASK) {
119 case L1_TYPE_S:
120 *pa = (pde & L1_S_FRAME) | (va & L1_S_OFFSET);
121 return L1_S_SIZE - (va & L1_S_OFFSET);
122 case L1_TYPE_C:
123 pte_pa = (pde & L1_C_ADDR_MASK)
124 | ((va & 0xff000) >> 10);
125 break;
126 case L1_TYPE_F:
127 pte_pa = (pde & L1_S_ADDR_MASK)
128 | ((va & 0xffc00) >> 8);
129 break;
130 default:
131 _kvm_syserr(kd, 0, "L1 entry is invalid");
132 return (0);
133 }
134
135 /*
136 * locate the pte and load it
137 */
138 if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pt_entry_t),
139 _kvm_pa2off(kd, pte_pa)) != sizeof(pt_entry_t)) {
140 _kvm_syserr(kd, 0, "could not read L2 entry");
141 return (0);
142 }
143 switch (pte & L2_TYPE_MASK) {
144 case L2_TYPE_L:
145 *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
146 return (L2_L_SIZE - (va & L2_L_OFFSET));
147 case L2_TYPE_S:
148 *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET);
149 return (L2_S_SIZE - (va & L2_S_OFFSET));
150 case L2_TYPE_T:
151 *pa = (pte & L2_T_FRAME) | (va & L2_T_OFFSET);
152 return (L2_T_SIZE - (va & L2_T_OFFSET));
153 default:
154 _kvm_syserr(kd, 0, "L2 entry is invalid");
155 return (0);
156 }
157
158 _kvm_err(kd, 0, "vatop not yet implemented!");
159 return 0;
160 }
161
162 off_t
_kvm_pa2off(kvm_t * kd,u_long pa)163 _kvm_pa2off(kvm_t * kd, u_long pa)
164 {
165 cpu_kcore_hdr_t *cpu_kh;
166 phys_ram_seg_t *ramsegs;
167 off_t off;
168 int i;
169
170 cpu_kh = kd->cpu_data;
171 ramsegs = (void *) ((char *) (void *) cpu_kh + cpu_kh->omemsegs);
172
173 off = 0;
174 for (i = 0; i < cpu_kh->nmemsegs; i++) {
175 if (pa >= ramsegs[i].start &&
176 (pa - ramsegs[i].start) < ramsegs[i].size) {
177 off += (pa - ramsegs[i].start);
178 break;
179 }
180 off += ramsegs[i].size;
181 }
182 return (kd->dump_off + off);
183 }
184
185 /*
186 * Machine-dependent initialization for ALL open kvm descriptors,
187 * not just those for a kernel crash dump. Some architectures
188 * have to deal with these NOT being constants! (i.e. arm)
189 */
190 int
_kvm_mdopen(kvm_t * kd)191 _kvm_mdopen(kvm_t * kd)
192 {
193 uintptr_t max_uva;
194 extern struct ps_strings *__ps_strings;
195
196 #if 0 /* XXX - These vary across arm machines... */
197 kd->min_uva = VM_MIN_ADDRESS;
198 kd->max_uva = VM_MAXUSER_ADDRESS;
199 #endif
200 /* This is somewhat hack-ish, but it works. */
201 max_uva = (uintptr_t) (__ps_strings + 1);
202 kd->max_uva = max_uva;
203 kd->min_uva = 0;
204
205 return (0);
206 }
207