1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2005 Olivier Houchard
5 * Copyright (c) 1989, 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software developed by the Computer Systems
9 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
10 * BG 91-66 and contributed to Berkeley.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 /*
37 * ARM machine dependent routines for kvm.
38 */
39
40 #include <sys/param.h>
41 #include <sys/endian.h>
42 #include <kvm.h>
43 #include <limits.h>
44 #include <stdint.h>
45 #include <stdlib.h>
46 #include <unistd.h>
47
48 #ifdef __arm__
49 #include <machine/vmparam.h>
50 #endif
51
52 #include "kvm_private.h"
53 #include "kvm_arm.h"
54
55 struct vmstate {
56 arm_pd_entry_t *l1pt;
57 size_t phnum;
58 GElf_Phdr *phdr;
59 };
60
61 /*
62 * Translate a physical memory address to a file-offset in the crash-dump.
63 */
64 static size_t
_kvm_pa2off(kvm_t * kd,uint64_t pa,off_t * ofs,size_t pgsz)65 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
66 {
67 struct vmstate *vm = kd->vmst;
68 GElf_Phdr *p;
69 size_t n;
70
71 p = vm->phdr;
72 n = vm->phnum;
73 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
74 p++, n--;
75 if (n == 0)
76 return (0);
77
78 *ofs = (pa - p->p_paddr) + p->p_offset;
79 if (pgsz == 0)
80 return (p->p_memsz - (pa - p->p_paddr));
81 return (pgsz - ((size_t)pa & (pgsz - 1)));
82 }
83
84 static void
_arm_freevtop(kvm_t * kd)85 _arm_freevtop(kvm_t *kd)
86 {
87 struct vmstate *vm = kd->vmst;
88
89 free(vm->phdr);
90 free(vm);
91 kd->vmst = NULL;
92 }
93
94 static int
_arm_probe(kvm_t * kd)95 _arm_probe(kvm_t *kd)
96 {
97
98 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
99 !_kvm_is_minidump(kd));
100 }
101
102 static int
_arm_initvtop(kvm_t * kd)103 _arm_initvtop(kvm_t *kd)
104 {
105 struct vmstate *vm;
106 struct kvm_nlist nl[2];
107 kvaddr_t kernbase;
108 arm_physaddr_t physaddr, pa;
109 arm_pd_entry_t *l1pt;
110 size_t i;
111 int found;
112
113 if (kd->rawdump) {
114 _kvm_err(kd, kd->program, "raw dumps not supported on arm");
115 return (-1);
116 }
117
118 vm = _kvm_malloc(kd, sizeof(*vm));
119 if (vm == NULL) {
120 _kvm_err(kd, kd->program, "cannot allocate vm");
121 return (-1);
122 }
123 kd->vmst = vm;
124 vm->l1pt = NULL;
125
126 if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1)
127 return (-1);
128
129 found = 0;
130 for (i = 0; i < vm->phnum; i++) {
131 if (vm->phdr[i].p_type == PT_DUMP_DELTA) {
132 kernbase = vm->phdr[i].p_vaddr;
133 physaddr = vm->phdr[i].p_paddr;
134 found = 1;
135 break;
136 }
137 }
138
139 nl[1].n_name = NULL;
140 if (!found) {
141 nl[0].n_name = "kernbase";
142 if (kvm_nlist2(kd, nl) != 0) {
143 #ifdef __arm__
144 kernbase = KERNBASE;
145 #else
146 _kvm_err(kd, kd->program, "cannot resolve kernbase");
147 return (-1);
148 #endif
149 } else
150 kernbase = nl[0].n_value;
151
152 nl[0].n_name = "physaddr";
153 if (kvm_nlist2(kd, nl) != 0) {
154 _kvm_err(kd, kd->program, "couldn't get phys addr");
155 return (-1);
156 }
157 physaddr = nl[0].n_value;
158 }
159 nl[0].n_name = "kernel_l1pa";
160 if (kvm_nlist2(kd, nl) != 0) {
161 _kvm_err(kd, kd->program, "bad namelist");
162 return (-1);
163 }
164 if (kvm_read2(kd, (nl[0].n_value - kernbase + physaddr), &pa,
165 sizeof(pa)) != sizeof(pa)) {
166 _kvm_err(kd, kd->program, "cannot read kernel_l1pa");
167 return (-1);
168 }
169 l1pt = _kvm_malloc(kd, ARM_L1_TABLE_SIZE);
170 if (l1pt == NULL) {
171 _kvm_err(kd, kd->program, "cannot allocate l1pt");
172 return (-1);
173 }
174 if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_L1_TABLE_SIZE) {
175 _kvm_err(kd, kd->program, "cannot read l1pt");
176 free(l1pt);
177 return (-1);
178 }
179 vm->l1pt = l1pt;
180 return 0;
181 }
182
183 /* from arm/pmap.c */
184 #define ARM_L1_IDX(va) ((va) >> ARM_L1_S_SHIFT)
185
186 #define l1pte_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S)
187 #define l1pte_valid(pde) ((pde) != 0)
188 #define l2pte_valid(pte) ((pte) != 0)
189 #define l2pte_index(v) (((v) & ARM_L1_S_OFFSET) >> ARM_L2_S_SHIFT)
190
191
192 static int
_arm_kvatop(kvm_t * kd,kvaddr_t va,off_t * pa)193 _arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
194 {
195 struct vmstate *vm = kd->vmst;
196 arm_pd_entry_t pd;
197 arm_pt_entry_t pte;
198 arm_physaddr_t pte_pa;
199 off_t pte_off;
200
201 if (vm->l1pt == NULL)
202 return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE));
203 pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]);
204 if (!l1pte_valid(pd))
205 goto invalid;
206 if (l1pte_section_p(pd)) {
207 /* 1MB section mapping. */
208 *pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET);
209 return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE));
210 }
211 pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
212 _kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE);
213 if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) {
214 _kvm_syserr(kd, kd->program, "_arm_kvatop: pread");
215 goto invalid;
216 }
217 pte = _kvm32toh(kd, pte);
218 if (!l2pte_valid(pte)) {
219 goto invalid;
220 }
221 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
222 *pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET);
223 return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE));
224 }
225 *pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET);
226 return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE));
227 invalid:
228 _kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)va);
229 return 0;
230 }
231
232 /*
233 * Machine-dependent initialization for ALL open kvm descriptors,
234 * not just those for a kernel crash dump. Some architectures
235 * have to deal with these NOT being constants! (i.e. m68k)
236 */
237 #ifdef FBSD_NOT_YET
238 int
_kvm_mdopen(kvm_t * kd)239 _kvm_mdopen(kvm_t *kd)
240 {
241
242 kd->usrstack = USRSTACK;
243 kd->min_uva = VM_MIN_ADDRESS;
244 kd->max_uva = VM_MAXUSER_ADDRESS;
245
246 return (0);
247 }
248 #endif
249
250 int
251 #ifdef __arm__
_arm_native(kvm_t * kd)252 _arm_native(kvm_t *kd)
253 #else
254 _arm_native(kvm_t *kd __unused)
255 #endif
256 {
257
258 #ifdef __arm__
259 #if _BYTE_ORDER == _LITTLE_ENDIAN
260 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB);
261 #else
262 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB);
263 #endif
264 #else
265 return (0);
266 #endif
267 }
268
269 static struct kvm_arch kvm_arm = {
270 .ka_probe = _arm_probe,
271 .ka_initvtop = _arm_initvtop,
272 .ka_freevtop = _arm_freevtop,
273 .ka_kvatop = _arm_kvatop,
274 .ka_native = _arm_native,
275 };
276
277 KVM_ARCH(kvm_arm);
278