2 * Copyright (c) 2006 Peter Wemm
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * From: FreeBSD: src/lib/libkvm/kvm_minidump_amd64.c r261799
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 * ARM64 (AArch64) machine dependent routines for kvm and minidumps.
35 #include <sys/param.h>
43 #include "../../sys/arm64/include/minidump.h"
47 #include "kvm_private.h"
48 #include "kvm_aarch64.h"
50 #define aarch64_round_page(x, size) roundup2((kvaddr_t)(x), size)
51 #define aarch64_trunc_page(x, size) rounddown2((kvaddr_t)(x), size)
54 struct minidumphdr hdr;
60 _aarch64_pte_get(kvm_t *kd, u_long pteindex)
62 aarch64_pte_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte));
68 _aarch64_minidump_probe(kvm_t *kd)
71 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_AARCH64) &&
72 _kvm_is_minidump(kd));
76 _aarch64_minidump_freevtop(kvm_t *kd)
78 struct vmstate *vm = kd->vmst;
85 _aarch64_minidump_initvtop(kvm_t *kd)
88 off_t off, dump_avail_off, sparse_off;
90 vmst = _kvm_malloc(kd, sizeof(*vmst));
92 _kvm_err(kd, kd->program, "cannot allocate vm");
96 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
98 _kvm_err(kd, kd->program, "cannot read dump header");
101 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
102 sizeof(vmst->hdr.magic)) != 0) {
103 _kvm_err(kd, kd->program, "not a minidump for this platform");
107 vmst->hdr.version = le32toh(vmst->hdr.version);
108 if (vmst->hdr.version > MINIDUMP_VERSION || vmst->hdr.version < 1) {
109 _kvm_err(kd, kd->program, "wrong minidump version. "
110 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
113 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
114 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
115 vmst->hdr.pmapsize = le32toh(vmst->hdr.pmapsize);
116 vmst->hdr.kernbase = le64toh(vmst->hdr.kernbase);
117 vmst->hdr.dmapphys = le64toh(vmst->hdr.dmapphys);
118 vmst->hdr.dmapbase = le64toh(vmst->hdr.dmapbase);
119 vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend);
120 /* dumpavailsize added in version 2 */
121 if (vmst->hdr.version >= 2) {
122 vmst->hdr.dumpavailsize = le32toh(vmst->hdr.dumpavailsize);
124 vmst->hdr.dumpavailsize = 0;
126 /* flags added in version 3 */
127 if (vmst->hdr.version >= 3) {
128 vmst->hdr.flags = le32toh(vmst->hdr.flags);
130 vmst->hdr.flags = MINIDUMP_FLAG_PS_4K;
133 switch (vmst->hdr.flags & MINIDUMP_FLAG_PS_MASK) {
134 case MINIDUMP_FLAG_PS_4K:
135 vmst->page_size = AARCH64_PAGE_SIZE_4K;
136 vmst->l3_shift = AARCH64_L3_SHIFT_4K;
138 case MINIDUMP_FLAG_PS_16K:
139 vmst->page_size = AARCH64_PAGE_SIZE_16K;
140 vmst->l3_shift = AARCH64_L3_SHIFT_16K;
143 _kvm_err(kd, kd->program, "unknown page size flag %x",
144 vmst->hdr.flags & MINIDUMP_FLAG_PS_MASK);
148 /* Skip header and msgbuf */
149 dump_avail_off = vmst->page_size +
150 aarch64_round_page(vmst->hdr.msgbufsize, vmst->page_size);
152 /* Skip dump_avail */
153 off = dump_avail_off +
154 aarch64_round_page(vmst->hdr.dumpavailsize, vmst->page_size);
156 /* build physical address lookup table for sparse pages */
158 aarch64_round_page(vmst->hdr.bitmapsize, vmst->page_size) +
159 aarch64_round_page(vmst->hdr.pmapsize, vmst->page_size);
160 if (_kvm_pt_init(kd, vmst->hdr.dumpavailsize, dump_avail_off,
161 vmst->hdr.bitmapsize, off, sparse_off, vmst->page_size) == -1) {
164 off += aarch64_round_page(vmst->hdr.bitmapsize, vmst->page_size);
166 if (_kvm_pmap_init(kd, vmst->hdr.pmapsize, off) == -1) {
169 off += aarch64_round_page(vmst->hdr.pmapsize, vmst->page_size);
175 _aarch64_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
178 aarch64_physaddr_t offset;
181 aarch64_physaddr_t a;
185 offset = va & (kd->vmst->page_size - 1);
187 if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
188 a = aarch64_trunc_page(va - vm->hdr.dmapbase + vm->hdr.dmapphys,
189 kd->vmst->page_size);
190 ofs = _kvm_pt_find(kd, a, kd->vmst->page_size);
192 _kvm_err(kd, kd->program, "_aarch64_minidump_vatop: "
193 "direct map address 0x%jx not in minidump",
198 return (kd->vmst->page_size - offset);
199 } else if (va >= vm->hdr.kernbase) {
200 l3_index = (va - vm->hdr.kernbase) >> kd->vmst->l3_shift;
201 if (l3_index >= vm->hdr.pmapsize / sizeof(l3))
203 l3 = _aarch64_pte_get(kd, l3_index);
204 if ((l3 & AARCH64_ATTR_DESCR_MASK) != AARCH64_L3_PAGE) {
205 _kvm_err(kd, kd->program,
206 "_aarch64_minidump_vatop: pde not valid");
209 a = l3 & ~AARCH64_ATTR_MASK;
210 ofs = _kvm_pt_find(kd, a, kd->vmst->page_size);
212 _kvm_err(kd, kd->program, "_aarch64_minidump_vatop: "
213 "physical address 0x%jx not in minidump",
218 return (kd->vmst->page_size - offset);
220 _kvm_err(kd, kd->program,
221 "_aarch64_minidump_vatop: virtual address 0x%jx not minidumped",
227 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
232 _aarch64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
237 "_aarch64_minidump_kvatop called in live kernel!");
240 return (_aarch64_minidump_vatop(kd, va, pa));
244 _aarch64_native(kvm_t *kd __unused)
255 _aarch64_entry_to_prot(aarch64_pte_t pte)
257 vm_prot_t prot = VM_PROT_READ;
259 /* Source: arm64/arm64/pmap.c:pmap_protect() */
260 if ((pte & AARCH64_ATTR_AP(AARCH64_ATTR_AP_RO)) == 0)
261 prot |= VM_PROT_WRITE;
262 if ((pte & AARCH64_ATTR_XN) == 0)
263 prot |= VM_PROT_EXECUTE;
268 _aarch64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
270 struct vmstate *vm = kd->vmst;
271 u_long nptes = vm->hdr.pmapsize / sizeof(aarch64_pte_t);
272 u_long bmindex, dva, pa, pteindex, va;
273 struct kvm_bitmap bm;
277 if (!_kvm_bitmap_init(&bm, vm->hdr.bitmapsize, &bmindex))
280 for (pteindex = 0; pteindex < nptes; pteindex++) {
281 aarch64_pte_t pte = _aarch64_pte_get(kd, pteindex);
283 if ((pte & AARCH64_ATTR_DESCR_MASK) != AARCH64_L3_PAGE)
286 va = vm->hdr.kernbase + (pteindex << kd->vmst->l3_shift);
287 pa = pte & ~AARCH64_ATTR_MASK;
288 dva = vm->hdr.dmapbase + pa;
289 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
290 _aarch64_entry_to_prot(pte), kd->vmst->page_size, 0)) {
295 while (_kvm_bitmap_next(&bm, &bmindex)) {
296 pa = _kvm_bit_id_pa(kd, bmindex, kd->vmst->page_size);
297 if (pa == _KVM_PA_INVALID)
299 dva = vm->hdr.dmapbase + pa;
300 if (vm->hdr.dmapend < (dva + kd->vmst->page_size))
303 prot = VM_PROT_READ | VM_PROT_WRITE;
304 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
305 prot, kd->vmst->page_size, 0)) {
312 _kvm_bitmap_deinit(&bm);
316 static struct kvm_arch kvm_aarch64_minidump = {
317 .ka_probe = _aarch64_minidump_probe,
318 .ka_initvtop = _aarch64_minidump_initvtop,
319 .ka_freevtop = _aarch64_minidump_freevtop,
320 .ka_kvatop = _aarch64_minidump_kvatop,
321 .ka_native = _aarch64_native,
322 .ka_walk_pages = _aarch64_minidump_walk_pages,
325 KVM_ARCH(kvm_aarch64_minidump);