2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2008 Semihalf, Grzegorz Bernacki
5 * Copyright (c) 2006 Peter Wemm
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * From: FreeBSD: src/lib/libkvm/kvm_minidump_i386.c,v 1.2 2006/06/05 08:51:14
31 #include <sys/cdefs.h>
33 * ARM machine dependent routines for kvm and minidumps.
36 #include <sys/endian.h>
37 #include <sys/param.h>
46 #include "../../sys/arm/include/minidump.h"
48 #include "kvm_private.h"
51 #define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE)
54 struct minidumphdr hdr;
55 unsigned char ei_data;
59 _arm_pte_get(kvm_t *kd, u_long pteindex)
61 arm_pt_entry_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte));
63 return _kvm32toh(kd, *pte);
67 _arm_minidump_probe(kvm_t *kd)
70 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
71 _kvm_is_minidump(kd));
75 _arm_minidump_freevtop(kvm_t *kd)
77 struct vmstate *vm = kd->vmst;
84 _arm_minidump_initvtop(kvm_t *kd)
87 off_t off, dump_avail_off, sparse_off;
89 vmst = _kvm_malloc(kd, sizeof(*vmst));
91 _kvm_err(kd, kd->program, "cannot allocate vm");
97 if (pread(kd->pmfd, &vmst->hdr,
98 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
99 _kvm_err(kd, kd->program, "cannot read dump header");
103 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
104 sizeof(vmst->hdr.magic)) != 0) {
105 _kvm_err(kd, kd->program, "not a minidump for this platform");
108 vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
109 if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) {
110 _kvm_err(kd, kd->program, "wrong minidump version. "
111 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
114 vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
115 vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
116 vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
117 vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
118 vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch);
119 vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat);
120 if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) {
121 /* This is a safe default as 1K pages are not used. */
122 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
124 vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ?
125 _kvm32toh(kd, vmst->hdr.dumpavailsize) : 0;
127 /* Skip header and msgbuf */
128 dump_avail_off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
130 /* Skip dump_avail */
131 off = dump_avail_off + arm_round_page(vmst->hdr.dumpavailsize);
133 sparse_off = off + arm_round_page(vmst->hdr.bitmapsize) +
134 arm_round_page(vmst->hdr.ptesize);
135 if (_kvm_pt_init(kd, vmst->hdr.dumpavailsize, dump_avail_off,
136 vmst->hdr.bitmapsize, off, sparse_off, ARM_PAGE_SIZE) == -1) {
139 off += arm_round_page(vmst->hdr.bitmapsize);
141 if (_kvm_pmap_init(kd, vmst->hdr.ptesize, off) == -1) {
144 off += arm_round_page(vmst->hdr.ptesize);
150 _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
154 arm_physaddr_t offset, a;
159 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
165 if (va >= vm->hdr.kernbase) {
166 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
167 if (pteindex >= vm->hdr.ptesize / sizeof(pte))
169 pte = _arm_pte_get(kd, pteindex);
170 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
171 _kvm_err(kd, kd->program,
172 "_arm_minidump_kvatop: pte not valid");
175 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
176 /* 64K page -> convert to be like 4K page */
177 offset = va & ARM_L2_S_OFFSET;
178 a = (pte & ARM_L2_L_FRAME) +
179 (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
181 if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
182 (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
183 _kvm_err(kd, kd->program,
184 "_arm_minidump_kvatop: pte not supported");
188 offset = va & ARM_L2_S_OFFSET;
189 a = pte & ARM_L2_S_FRAME;
192 ofs = _kvm_pt_find(kd, a, ARM_PAGE_SIZE);
194 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
195 "physical address 0x%jx not in minidump",
201 return (ARM_PAGE_SIZE - offset);
203 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
204 "address 0x%jx not minidumped", (uintmax_t)va);
207 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
212 _arm_entry_to_prot(kvm_t *kd, arm_pt_entry_t pte)
214 struct vmstate *vm = kd->vmst;
215 vm_prot_t prot = VM_PROT_READ;
217 /* Source: arm/arm/pmap-v4.c:pmap_fault_fixup() */
218 if (vm->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4) {
219 if (pte & ARM_L2_S_PROT_W)
220 prot |= VM_PROT_WRITE;
224 /* Source: arm/arm/pmap-v6.c:pmap_protect() */
225 if ((pte & ARM_PTE2_RO) == 0)
226 prot |= VM_PROT_WRITE;
227 if ((pte & ARM_PTE2_NX) == 0)
228 prot |= VM_PROT_EXECUTE;
233 _arm_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
235 struct vmstate *vm = kd->vmst;
236 u_long nptes = vm->hdr.ptesize / sizeof(arm_pt_entry_t);
237 u_long dva, pa, pteindex, va;
239 for (pteindex = 0; pteindex < nptes; pteindex++) {
240 arm_pt_entry_t pte = _arm_pte_get(kd, pteindex);
242 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV)
245 va = vm->hdr.kernbase + (pteindex << ARM_PAGE_SHIFT);
246 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
248 pa = (pte & ARM_L2_L_FRAME) +
249 (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
251 if (vm->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
252 (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
256 pa = pte & ARM_L2_S_FRAME;
259 dva = 0; /* no direct map on this platform */
260 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
261 _arm_entry_to_prot(kd, pte), ARM_PAGE_SIZE, 0))
267 static struct kvm_arch kvm_arm_minidump = {
268 .ka_probe = _arm_minidump_probe,
269 .ka_initvtop = _arm_minidump_initvtop,
270 .ka_freevtop = _arm_minidump_freevtop,
271 .ka_kvatop = _arm_minidump_kvatop,
272 .ka_native = _arm_native,
273 .ka_walk_pages = _arm_minidump_walk_pages,
276 KVM_ARCH(kvm_arm_minidump);