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/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include <sys/param.h>
44 #include <sys/endian.h>
45 #include <kvm.h>
46 #include <limits.h>
47 #include <stdint.h>
48 #include <stdlib.h>
49 #include <unistd.h>
50
51 #ifdef __arm__
52 #include <machine/vmparam.h>
53 #endif
54
55 #include "kvm_private.h"
56 #include "kvm_arm.h"
57
58 struct vmstate {
59 arm_pd_entry_t *l1pt;
60 size_t phnum;
61 GElf_Phdr *phdr;
62 };
63
64 /*
65 * Translate a physical memory address to a file-offset in the crash-dump.
66 */
67 static size_t
_kvm_pa2off(kvm_t * kd,uint64_t pa,off_t * ofs,size_t pgsz)68 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
69 {
70 struct vmstate *vm = kd->vmst;
71 GElf_Phdr *p;
72 size_t n;
73
74 p = vm->phdr;
75 n = vm->phnum;
76 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
77 p++, n--;
78 if (n == 0)
79 return (0);
80
81 *ofs = (pa - p->p_paddr) + p->p_offset;
82 if (pgsz == 0)
83 return (p->p_memsz - (pa - p->p_paddr));
84 return (pgsz - ((size_t)pa & (pgsz - 1)));
85 }
86
87 static void
_arm_freevtop(kvm_t * kd)88 _arm_freevtop(kvm_t *kd)
89 {
90 struct vmstate *vm = kd->vmst;
91
92 free(vm->phdr);
93 free(vm);
94 kd->vmst = NULL;
95 }
96
97 static int
_arm_probe(kvm_t * kd)98 _arm_probe(kvm_t *kd)
99 {
100
101 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
102 !_kvm_is_minidump(kd));
103 }
104
105 static int
_arm_initvtop(kvm_t * kd)106 _arm_initvtop(kvm_t *kd)
107 {
108 struct vmstate *vm;
109 struct kvm_nlist nl[2];
110 kvaddr_t kernbase;
111 arm_physaddr_t physaddr, pa;
112 arm_pd_entry_t *l1pt;
113 size_t i;
114 int found;
115
116 if (kd->rawdump) {
117 _kvm_err(kd, kd->program, "raw dumps not supported on arm");
118 return (-1);
119 }
120
121 vm = _kvm_malloc(kd, sizeof(*vm));
122 if (vm == NULL) {
123 _kvm_err(kd, kd->program, "cannot allocate vm");
124 return (-1);
125 }
126 kd->vmst = vm;
127 vm->l1pt = NULL;
128
129 if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1)
130 return (-1);
131
132 found = 0;
133 for (i = 0; i < vm->phnum; i++) {
134 if (vm->phdr[i].p_type == PT_DUMP_DELTA) {
135 kernbase = vm->phdr[i].p_vaddr;
136 physaddr = vm->phdr[i].p_paddr;
137 found = 1;
138 break;
139 }
140 }
141
142 nl[1].n_name = NULL;
143 if (!found) {
144 nl[0].n_name = "kernbase";
145 if (kvm_nlist2(kd, nl) != 0) {
146 #ifdef __arm__
147 kernbase = KERNBASE;
148 #else
149 _kvm_err(kd, kd->program, "cannot resolve kernbase");
150 return (-1);
151 #endif
152 } else
153 kernbase = nl[0].n_value;
154
155 nl[0].n_name = "physaddr";
156 if (kvm_nlist2(kd, nl) != 0) {
157 _kvm_err(kd, kd->program, "couldn't get phys addr");
158 return (-1);
159 }
160 physaddr = nl[0].n_value;
161 }
162 nl[0].n_name = "kernel_l1pa";
163 if (kvm_nlist2(kd, nl) != 0) {
164 _kvm_err(kd, kd->program, "bad namelist");
165 return (-1);
166 }
167 if (kvm_read2(kd, (nl[0].n_value - kernbase + physaddr), &pa,
168 sizeof(pa)) != sizeof(pa)) {
169 _kvm_err(kd, kd->program, "cannot read kernel_l1pa");
170 return (-1);
171 }
172 l1pt = _kvm_malloc(kd, ARM_L1_TABLE_SIZE);
173 if (l1pt == NULL) {
174 _kvm_err(kd, kd->program, "cannot allocate l1pt");
175 return (-1);
176 }
177 if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_L1_TABLE_SIZE) {
178 _kvm_err(kd, kd->program, "cannot read l1pt");
179 free(l1pt);
180 return (-1);
181 }
182 vm->l1pt = l1pt;
183 return 0;
184 }
185
186 /* from arm/pmap.c */
187 #define ARM_L1_IDX(va) ((va) >> ARM_L1_S_SHIFT)
188
189 #define l1pte_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S)
190 #define l1pte_valid(pde) ((pde) != 0)
191 #define l2pte_valid(pte) ((pte) != 0)
192 #define l2pte_index(v) (((v) & ARM_L1_S_OFFSET) >> ARM_L2_S_SHIFT)
193
194
195 static int
_arm_kvatop(kvm_t * kd,kvaddr_t va,off_t * pa)196 _arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
197 {
198 struct vmstate *vm = kd->vmst;
199 arm_pd_entry_t pd;
200 arm_pt_entry_t pte;
201 arm_physaddr_t pte_pa;
202 off_t pte_off;
203
204 if (vm->l1pt == NULL)
205 return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE));
206 pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]);
207 if (!l1pte_valid(pd))
208 goto invalid;
209 if (l1pte_section_p(pd)) {
210 /* 1MB section mapping. */
211 *pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET);
212 return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE));
213 }
214 pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
215 _kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE);
216 if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) {
217 _kvm_syserr(kd, kd->program, "_arm_kvatop: pread");
218 goto invalid;
219 }
220 pte = _kvm32toh(kd, pte);
221 if (!l2pte_valid(pte)) {
222 goto invalid;
223 }
224 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
225 *pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET);
226 return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE));
227 }
228 *pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET);
229 return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE));
230 invalid:
231 _kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)va);
232 return 0;
233 }
234
235 /*
236 * Machine-dependent initialization for ALL open kvm descriptors,
237 * not just those for a kernel crash dump. Some architectures
238 * have to deal with these NOT being constants! (i.e. m68k)
239 */
240 #ifdef FBSD_NOT_YET
241 int
_kvm_mdopen(kvm_t * kd)242 _kvm_mdopen(kvm_t *kd)
243 {
244
245 kd->usrstack = USRSTACK;
246 kd->min_uva = VM_MIN_ADDRESS;
247 kd->max_uva = VM_MAXUSER_ADDRESS;
248
249 return (0);
250 }
251 #endif
252
253 int
254 #ifdef __arm__
_arm_native(kvm_t * kd)255 _arm_native(kvm_t *kd)
256 #else
257 _arm_native(kvm_t *kd __unused)
258 #endif
259 {
260
261 #ifdef __arm__
262 #if _BYTE_ORDER == _LITTLE_ENDIAN
263 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB);
264 #else
265 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB);
266 #endif
267 #else
268 return (0);
269 #endif
270 }
271
272 static struct kvm_arch kvm_arm = {
273 .ka_probe = _arm_probe,
274 .ka_initvtop = _arm_initvtop,
275 .ka_freevtop = _arm_freevtop,
276 .ka_kvatop = _arm_kvatop,
277 .ka_native = _arm_native,
278 };
279
280 KVM_ARCH(kvm_arm);
281