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 #include <sys/param.h> 31 32 #include <kvm.h> 33 34 #include <limits.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 #include "../../sys/powerpc/include/minidump.h" 40 #include "kvm_private.h" 41 #include "kvm_powerpc64.h" 42 43 44 static int 45 _powerpc64_minidump_probe(kvm_t *kd) 46 { 47 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) && 48 _kvm_is_minidump(kd)); 49 } 50 51 static void 52 _powerpc64_minidump_freevtop(kvm_t *kd) 53 { 54 struct vmstate *vm = kd->vmst; 55 56 if (vm == NULL) 57 return; 58 if (PPC64_MMU_OPS(kd)) 59 PPC64_MMU_OP(kd, cleanup); 60 free(vm); 61 kd->vmst = NULL; 62 } 63 64 static int 65 _powerpc64_minidump_initvtop(kvm_t *kd) 66 { 67 struct vmstate *vmst; 68 struct minidumphdr *hdr; 69 off_t dump_avail_off, bitmap_off, pmap_off, sparse_off; 70 const char *mmu_name; 71 72 /* Alloc VM */ 73 vmst = _kvm_malloc(kd, sizeof(*vmst)); 74 if (vmst == NULL) { 75 _kvm_err(kd, kd->program, "cannot allocate vm"); 76 return (-1); 77 } 78 hdr = &vmst->hdr; 79 kd->vmst = vmst; 80 PPC64_MMU_OPS(kd) = NULL; 81 /* Read minidump header */ 82 if (pread(kd->pmfd, hdr, sizeof(*hdr), 0) != sizeof(*hdr)) { 83 _kvm_err(kd, kd->program, "cannot read minidump header"); 84 goto failed; 85 } 86 /* Check magic */ 87 if (strncmp(MINIDUMP_MAGIC, hdr->magic, sizeof(hdr->magic)) != 0) { 88 _kvm_err(kd, kd->program, "not a minidump for this platform"); 89 goto failed; 90 } 91 /* Check version */ 92 hdr->version = be32toh(hdr->version); 93 if (hdr->version != MINIDUMP_VERSION && hdr->version != 1) { 94 _kvm_err(kd, kd->program, "wrong minidump version. " 95 "Expected %d got %d", MINIDUMP_VERSION, hdr->version); 96 goto failed; 97 } 98 /* Convert header fields to host endian */ 99 hdr->msgbufsize = be32toh(hdr->msgbufsize); 100 hdr->bitmapsize = be32toh(hdr->bitmapsize); 101 hdr->pmapsize = be32toh(hdr->pmapsize); 102 hdr->kernbase = be64toh(hdr->kernbase); 103 hdr->kernend = be64toh(hdr->kernend); 104 hdr->dmapbase = be64toh(hdr->dmapbase); 105 hdr->dmapend = be64toh(hdr->dmapend); 106 hdr->hw_direct_map = be32toh(hdr->hw_direct_map); 107 hdr->startkernel = be64toh(hdr->startkernel); 108 hdr->endkernel = be64toh(hdr->endkernel); 109 hdr->dumpavailsize = hdr->version == MINIDUMP_VERSION ? 110 be32toh(hdr->dumpavailsize) : 0; 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 dump_avail_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize); 144 bitmap_off = dump_avail_off + ppc64_round_page(hdr->dumpavailsize); 145 pmap_off = bitmap_off + ppc64_round_page(hdr->bitmapsize); 146 sparse_off = pmap_off + ppc64_round_page(hdr->pmapsize); 147 148 /* dump offsets */ 149 dprintf("%s: msgbuf_off=0x%jx, bitmap_off=0x%jx, pmap_off=0x%jx, " 150 "sparse_off=0x%jx\n", 151 __func__, (uintmax_t)PPC64_PAGE_SIZE, (uintmax_t)bitmap_off, 152 (uintmax_t)pmap_off, (uintmax_t)sparse_off); 153 154 /* build physical address lookup table for sparse pages */ 155 if (_kvm_pt_init(kd, hdr->dumpavailsize, dump_avail_off, 156 hdr->bitmapsize, bitmap_off, sparse_off, PPC64_PAGE_SIZE) == -1) 157 goto failed; 158 159 if (_kvm_pmap_init(kd, hdr->pmapsize, pmap_off) == -1) 160 goto failed; 161 return (0); 162 163 failed: 164 _powerpc64_minidump_freevtop(kd); 165 return (-1); 166 } 167 168 static int 169 _powerpc64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 170 { 171 if (ISALIVE(kd)) { 172 _kvm_err(kd, 0, "%s called in live kernel!", __func__); 173 return (0); 174 } 175 return (PPC64_MMU_OP(kd, kvatop, va, pa)); 176 } 177 178 static int 179 _powerpc64_native(kvm_t *kd __unused) 180 { 181 #ifdef __powerpc64__ 182 return (1); 183 #else 184 return (0); 185 #endif 186 } 187 188 static kssize_t 189 _powerpc64_kerndisp(kvm_t *kd) 190 { 191 return (kd->vmst->hdr.startkernel - PPC64_KERNBASE); 192 } 193 194 static int 195 _powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) 196 { 197 return (PPC64_MMU_OP(kd, walk_pages, cb, arg)); 198 } 199 200 static struct kvm_arch kvm_powerpc64_minidump = { 201 .ka_probe = _powerpc64_minidump_probe, 202 .ka_initvtop = _powerpc64_minidump_initvtop, 203 .ka_freevtop = _powerpc64_minidump_freevtop, 204 .ka_kvatop = _powerpc64_minidump_kvatop, 205 .ka_walk_pages = _powerpc64_minidump_walk_pages, 206 .ka_native = _powerpc64_native, 207 .ka_kerndisp = _powerpc64_kerndisp, 208 }; 209 210 KVM_ARCH(kvm_powerpc64_minidump); 211