1 /*- 2 * Copyright (c) 2006 Peter Wemm 3 * Copyright (c) 2019 Leandro Lupori 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * From: FreeBSD: src/lib/libkvm/kvm_minidump_riscv.c 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 34 #include <kvm.h> 35 36 #include <limits.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #include "../../sys/powerpc/include/minidump.h" 42 #include "kvm_private.h" 43 #include "kvm_powerpc64.h" 44 45 46 static int 47 _powerpc64_minidump_probe(kvm_t *kd) 48 { 49 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) && 50 _kvm_is_minidump(kd)); 51 } 52 53 static void 54 _powerpc64_minidump_freevtop(kvm_t *kd) 55 { 56 struct vmstate *vm = kd->vmst; 57 58 if (vm == NULL) 59 return; 60 if (PPC64_MMU_OPS(kd)) 61 PPC64_MMU_OP(kd, cleanup); 62 free(vm); 63 kd->vmst = NULL; 64 } 65 66 static int 67 _powerpc64_minidump_initvtop(kvm_t *kd) 68 { 69 struct vmstate *vmst; 70 struct minidumphdr *hdr; 71 off_t bitmap_off, pmap_off, sparse_off; 72 const char *mmu_name; 73 74 /* Alloc VM */ 75 vmst = _kvm_malloc(kd, sizeof(*vmst)); 76 if (vmst == NULL) { 77 _kvm_err(kd, kd->program, "cannot allocate vm"); 78 return (-1); 79 } 80 hdr = &vmst->hdr; 81 kd->vmst = vmst; 82 PPC64_MMU_OPS(kd) = NULL; 83 /* Read minidump header */ 84 if (pread(kd->pmfd, hdr, sizeof(*hdr), 0) != sizeof(*hdr)) { 85 _kvm_err(kd, kd->program, "cannot read minidump header"); 86 goto failed; 87 } 88 /* Check magic */ 89 if (strncmp(MINIDUMP_MAGIC, hdr->magic, sizeof(hdr->magic)) != 0) { 90 _kvm_err(kd, kd->program, "not a minidump for this platform"); 91 goto failed; 92 } 93 /* Check version */ 94 hdr->version = be32toh(hdr->version); 95 if (hdr->version != MINIDUMP_VERSION) { 96 _kvm_err(kd, kd->program, "wrong minidump version. " 97 "Expected %d got %d", MINIDUMP_VERSION, hdr->version); 98 goto failed; 99 } 100 /* Convert header fields to host endian */ 101 hdr->msgbufsize = be32toh(hdr->msgbufsize); 102 hdr->bitmapsize = be32toh(hdr->bitmapsize); 103 hdr->pmapsize = be32toh(hdr->pmapsize); 104 hdr->kernbase = be64toh(hdr->kernbase); 105 hdr->kernend = be64toh(hdr->kernend); 106 hdr->dmapbase = be64toh(hdr->dmapbase); 107 hdr->dmapend = be64toh(hdr->dmapend); 108 hdr->hw_direct_map = be32toh(hdr->hw_direct_map); 109 hdr->startkernel = be64toh(hdr->startkernel); 110 hdr->endkernel = be64toh(hdr->endkernel); 111 112 vmst->kimg_start = PPC64_KERNBASE; 113 vmst->kimg_end = PPC64_KERNBASE + hdr->endkernel - hdr->startkernel; 114 115 /* dump header */ 116 dprintf("%s: mmu_name=%s,\n\t" 117 "msgbufsize=0x%jx, bitmapsize=0x%jx, pmapsize=0x%jx, " 118 "kernbase=0x%jx, kernend=0x%jx,\n\t" 119 "dmapbase=0x%jx, dmapend=0x%jx, hw_direct_map=%d, " 120 "startkernel=0x%jx, endkernel=0x%jx\n\t" 121 "kimg_start=0x%jx, kimg_end=0x%jx\n", 122 __func__, hdr->mmu_name, 123 (uintmax_t)hdr->msgbufsize, 124 (uintmax_t)hdr->bitmapsize, (uintmax_t)hdr->pmapsize, 125 (uintmax_t)hdr->kernbase, (uintmax_t)hdr->kernend, 126 (uintmax_t)hdr->dmapbase, (uintmax_t)hdr->dmapend, 127 hdr->hw_direct_map, hdr->startkernel, hdr->endkernel, 128 (uintmax_t)vmst->kimg_start, (uintmax_t)vmst->kimg_end); 129 130 /* Detect and initialize MMU */ 131 mmu_name = hdr->mmu_name; 132 if (strcmp(mmu_name, PPC64_MMU_G5) == 0 || 133 strcmp(mmu_name, PPC64_MMU_PHYP) == 0) 134 PPC64_MMU_OPS(kd) = ppc64_mmu_ops_hpt; 135 else { 136 _kvm_err(kd, kd->program, "unsupported MMU: %s", mmu_name); 137 goto failed; 138 } 139 if (PPC64_MMU_OP(kd, init) == -1) 140 goto failed; 141 142 /* Get dump parts' offsets */ 143 bitmap_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize); 144 pmap_off = bitmap_off + ppc64_round_page(hdr->bitmapsize); 145 sparse_off = pmap_off + ppc64_round_page(hdr->pmapsize); 146 147 /* dump offsets */ 148 dprintf("%s: msgbuf_off=0x%jx, bitmap_off=0x%jx, pmap_off=0x%jx, " 149 "sparse_off=0x%jx\n", 150 __func__, (uintmax_t)PPC64_PAGE_SIZE, (uintmax_t)bitmap_off, 151 (uintmax_t)pmap_off, (uintmax_t)sparse_off); 152 153 /* build physical address lookup table for sparse pages */ 154 if (_kvm_pt_init(kd, hdr->bitmapsize, bitmap_off, sparse_off, 155 PPC64_PAGE_SIZE, sizeof(uint64_t)) == -1) 156 goto failed; 157 158 if (_kvm_pmap_init(kd, hdr->pmapsize, pmap_off) == -1) 159 goto failed; 160 return (0); 161 162 failed: 163 _powerpc64_minidump_freevtop(kd); 164 return (-1); 165 } 166 167 static int 168 _powerpc64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 169 { 170 if (ISALIVE(kd)) { 171 _kvm_err(kd, 0, "%s called in live kernel!", __func__); 172 return (0); 173 } 174 return (PPC64_MMU_OP(kd, kvatop, va, pa)); 175 } 176 177 static int 178 _powerpc64_native(kvm_t *kd __unused) 179 { 180 #ifdef __powerpc64__ 181 return (1); 182 #else 183 return (0); 184 #endif 185 } 186 187 static int 188 _powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) 189 { 190 return (PPC64_MMU_OP(kd, walk_pages, cb, arg)); 191 } 192 193 static struct kvm_arch kvm_powerpc64_minidump = { 194 .ka_probe = _powerpc64_minidump_probe, 195 .ka_initvtop = _powerpc64_minidump_initvtop, 196 .ka_freevtop = _powerpc64_minidump_freevtop, 197 .ka_kvatop = _powerpc64_minidump_kvatop, 198 .ka_walk_pages = _powerpc64_minidump_walk_pages, 199 .ka_native = _powerpc64_native, 200 }; 201 202 KVM_ARCH(kvm_powerpc64_minidump); 203