2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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>
32 __FBSDID("$FreeBSD$");
35 * ARM machine dependent routines for kvm and minidumps.
38 #include <sys/endian.h>
39 #include <sys/param.h>
48 #include "../../sys/arm/include/minidump.h"
50 #include "kvm_private.h"
53 #define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE)
56 struct minidumphdr hdr;
57 unsigned char ei_data;
61 _arm_pte_get(kvm_t *kd, u_long pteindex)
63 arm_pt_entry_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte));
65 return _kvm32toh(kd, *pte);
69 _arm_minidump_probe(kvm_t *kd)
72 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
73 _kvm_is_minidump(kd));
77 _arm_minidump_freevtop(kvm_t *kd)
79 struct vmstate *vm = kd->vmst;
86 _arm_minidump_initvtop(kvm_t *kd)
89 off_t off, dump_avail_off, sparse_off;
91 vmst = _kvm_malloc(kd, sizeof(*vmst));
93 _kvm_err(kd, kd->program, "cannot allocate vm");
99 if (pread(kd->pmfd, &vmst->hdr,
100 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
101 _kvm_err(kd, kd->program, "cannot read dump header");
105 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
106 sizeof(vmst->hdr.magic)) != 0) {
107 _kvm_err(kd, kd->program, "not a minidump for this platform");
110 vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
111 if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) {
112 _kvm_err(kd, kd->program, "wrong minidump version. "
113 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
116 vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
117 vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
118 vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
119 vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
120 vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch);
121 vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat);
122 if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) {
123 /* This is a safe default as 1K pages are not used. */
124 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
126 vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ?
127 _kvm32toh(kd, vmst->hdr.dumpavailsize) : 0;
129 /* Skip header and msgbuf */
130 dump_avail_off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
132 /* Skip dump_avail */
133 off = dump_avail_off + arm_round_page(vmst->hdr.dumpavailsize);
135 sparse_off = off + arm_round_page(vmst->hdr.bitmapsize) +
136 arm_round_page(vmst->hdr.ptesize);
137 if (_kvm_pt_init(kd, vmst->hdr.dumpavailsize, dump_avail_off,
138 vmst->hdr.bitmapsize, off, sparse_off, ARM_PAGE_SIZE,
139 sizeof(uint32_t)) == -1) {
142 off += arm_round_page(vmst->hdr.bitmapsize);
144 if (_kvm_pmap_init(kd, vmst->hdr.ptesize, off) == -1) {
147 off += arm_round_page(vmst->hdr.ptesize);
153 _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
157 arm_physaddr_t offset, a;
162 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
168 if (va >= vm->hdr.kernbase) {
169 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
170 if (pteindex >= vm->hdr.ptesize / sizeof(pte))
172 pte = _arm_pte_get(kd, pteindex);
173 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
174 _kvm_err(kd, kd->program,
175 "_arm_minidump_kvatop: pte not valid");
178 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
179 /* 64K page -> convert to be like 4K page */
180 offset = va & ARM_L2_S_OFFSET;
181 a = (pte & ARM_L2_L_FRAME) +
182 (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
184 if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
185 (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
186 _kvm_err(kd, kd->program,
187 "_arm_minidump_kvatop: pte not supported");
191 offset = va & ARM_L2_S_OFFSET;
192 a = pte & ARM_L2_S_FRAME;
195 ofs = _kvm_pt_find(kd, a, ARM_PAGE_SIZE);
197 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
198 "physical address 0x%jx not in minidump",
204 return (ARM_PAGE_SIZE - offset);
206 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
207 "address 0x%jx not minidumped", (uintmax_t)va);
210 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
215 _arm_entry_to_prot(kvm_t *kd, arm_pt_entry_t pte)
217 struct vmstate *vm = kd->vmst;
218 vm_prot_t prot = VM_PROT_READ;
220 /* Source: arm/arm/pmap-v4.c:pmap_fault_fixup() */
221 if (vm->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4) {
222 if (pte & ARM_L2_S_PROT_W)
223 prot |= VM_PROT_WRITE;
227 /* Source: arm/arm/pmap-v6.c:pmap_protect() */
228 if ((pte & ARM_PTE2_RO) == 0)
229 prot |= VM_PROT_WRITE;
230 if ((pte & ARM_PTE2_NX) == 0)
231 prot |= VM_PROT_EXECUTE;
236 _arm_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
238 struct vmstate *vm = kd->vmst;
239 u_long nptes = vm->hdr.ptesize / sizeof(arm_pt_entry_t);
240 u_long dva, pa, pteindex, va;
242 for (pteindex = 0; pteindex < nptes; pteindex++) {
243 arm_pt_entry_t pte = _arm_pte_get(kd, pteindex);
245 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV)
248 va = vm->hdr.kernbase + (pteindex << ARM_PAGE_SHIFT);
249 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
251 pa = (pte & ARM_L2_L_FRAME) +
252 (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
254 if (vm->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
255 (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
259 pa = pte & ARM_L2_S_FRAME;
262 dva = 0; /* no direct map on this platform */
263 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
264 _arm_entry_to_prot(kd, pte), ARM_PAGE_SIZE, 0))
270 static struct kvm_arch kvm_arm_minidump = {
271 .ka_probe = _arm_minidump_probe,
272 .ka_initvtop = _arm_minidump_initvtop,
273 .ka_freevtop = _arm_minidump_freevtop,
274 .ka_kvatop = _arm_minidump_kvatop,
275 .ka_native = _arm_native,
276 .ka_walk_pages = _arm_minidump_walk_pages,
279 KVM_ARCH(kvm_arm_minidump);