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/param.h> 30 31 #include <kvm.h> 32 33 #include <limits.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 38 #include "../../sys/powerpc/include/minidump.h" 39 #include "kvm_private.h" 40 #include "kvm_powerpc64.h" 41 42 43 static int 44 _powerpc64_minidump_probe(kvm_t *kd) 45 { 46 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_PPC64) && 47 _kvm_is_minidump(kd)); 48 } 49 50 static void 51 _powerpc64_minidump_freevtop(kvm_t *kd) 52 { 53 struct vmstate *vm = kd->vmst; 54 55 if (vm == NULL) 56 return; 57 if (PPC64_MMU_OPS(kd)) 58 PPC64_MMU_OP(kd, cleanup); 59 free(vm); 60 kd->vmst = NULL; 61 } 62 63 static int 64 _powerpc64_minidump_initvtop(kvm_t *kd) 65 { 66 struct vmstate *vmst; 67 struct minidumphdr *hdr; 68 off_t dump_avail_off, bitmap_off, pmap_off, sparse_off; 69 const char *mmu_name; 70 71 /* Alloc VM */ 72 vmst = _kvm_malloc(kd, sizeof(*vmst)); 73 if (vmst == NULL) { 74 _kvm_err(kd, kd->program, "cannot allocate vm"); 75 return (-1); 76 } 77 hdr = &vmst->hdr; 78 kd->vmst = vmst; 79 PPC64_MMU_OPS(kd) = NULL; 80 /* Read minidump header */ 81 if (pread(kd->pmfd, hdr, sizeof(*hdr), 0) != sizeof(*hdr)) { 82 _kvm_err(kd, kd->program, "cannot read minidump header"); 83 goto failed; 84 } 85 /* Check magic */ 86 if (strncmp(MINIDUMP_MAGIC, hdr->magic, sizeof(hdr->magic)) != 0) { 87 _kvm_err(kd, kd->program, "not a minidump for this platform"); 88 goto failed; 89 } 90 /* Check version */ 91 hdr->version = be32toh(hdr->version); 92 if (hdr->version != MINIDUMP_VERSION && hdr->version != 1) { 93 _kvm_err(kd, kd->program, "wrong minidump version. " 94 "Expected %d got %d", MINIDUMP_VERSION, hdr->version); 95 goto failed; 96 } 97 /* Convert header fields to host endian */ 98 hdr->msgbufsize = be32toh(hdr->msgbufsize); 99 hdr->bitmapsize = be32toh(hdr->bitmapsize); 100 hdr->pmapsize = be32toh(hdr->pmapsize); 101 hdr->kernbase = be64toh(hdr->kernbase); 102 hdr->kernend = be64toh(hdr->kernend); 103 hdr->dmapbase = be64toh(hdr->dmapbase); 104 hdr->dmapend = be64toh(hdr->dmapend); 105 hdr->hw_direct_map = be32toh(hdr->hw_direct_map); 106 hdr->startkernel = be64toh(hdr->startkernel); 107 hdr->endkernel = be64toh(hdr->endkernel); 108 hdr->dumpavailsize = hdr->version == MINIDUMP_VERSION ? 109 be32toh(hdr->dumpavailsize) : 0; 110 111 vmst->kimg_start = PPC64_KERNBASE; 112 vmst->kimg_end = PPC64_KERNBASE + hdr->endkernel - hdr->startkernel; 113 114 /* dump header */ 115 dprintf("%s: mmu_name=%s,\n\t" 116 "msgbufsize=0x%jx, bitmapsize=0x%jx, pmapsize=0x%jx, " 117 "kernbase=0x%jx, kernend=0x%jx,\n\t" 118 "dmapbase=0x%jx, dmapend=0x%jx, hw_direct_map=%d, " 119 "startkernel=0x%jx, endkernel=0x%jx\n\t" 120 "kimg_start=0x%jx, kimg_end=0x%jx\n", 121 __func__, hdr->mmu_name, 122 (uintmax_t)hdr->msgbufsize, 123 (uintmax_t)hdr->bitmapsize, (uintmax_t)hdr->pmapsize, 124 (uintmax_t)hdr->kernbase, (uintmax_t)hdr->kernend, 125 (uintmax_t)hdr->dmapbase, (uintmax_t)hdr->dmapend, 126 hdr->hw_direct_map, hdr->startkernel, hdr->endkernel, 127 (uintmax_t)vmst->kimg_start, (uintmax_t)vmst->kimg_end); 128 129 /* Detect and initialize MMU */ 130 mmu_name = hdr->mmu_name; 131 if (strcmp(mmu_name, PPC64_MMU_G5) == 0 || 132 strcmp(mmu_name, PPC64_MMU_PHYP) == 0) 133 PPC64_MMU_OPS(kd) = ppc64_mmu_ops_hpt; 134 else { 135 _kvm_err(kd, kd->program, "unsupported MMU: %s", mmu_name); 136 goto failed; 137 } 138 if (PPC64_MMU_OP(kd, init) == -1) 139 goto failed; 140 141 /* Get dump parts' offsets */ 142 dump_avail_off = PPC64_PAGE_SIZE + ppc64_round_page(hdr->msgbufsize); 143 bitmap_off = dump_avail_off + ppc64_round_page(hdr->dumpavailsize); 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->dumpavailsize, dump_avail_off, 155 hdr->bitmapsize, bitmap_off, sparse_off, PPC64_PAGE_SIZE) == -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 kssize_t 188 _powerpc64_kerndisp(kvm_t *kd) 189 { 190 return (kd->vmst->hdr.startkernel - PPC64_KERNBASE); 191 } 192 193 static int 194 _powerpc64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) 195 { 196 return (PPC64_MMU_OP(kd, walk_pages, cb, arg)); 197 } 198 199 static struct kvm_arch kvm_powerpc64_minidump = { 200 .ka_probe = _powerpc64_minidump_probe, 201 .ka_initvtop = _powerpc64_minidump_initvtop, 202 .ka_freevtop = _powerpc64_minidump_freevtop, 203 .ka_kvatop = _powerpc64_minidump_kvatop, 204 .ka_walk_pages = _powerpc64_minidump_walk_pages, 205 .ka_native = _powerpc64_native, 206 .ka_kerndisp = _powerpc64_kerndisp, 207 }; 208 209 KVM_ARCH(kvm_powerpc64_minidump); 210