1 /* $OpenBSD: kvm_alpha.c,v 1.17 2021/12/01 16:53:28 deraadt Exp $ */ 2 /* $NetBSD: kvm_alpha.c,v 1.5 1996/10/01 21:12:05 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1994, 1995 Carnegie-Mellon University. 6 * All rights reserved. 7 * 8 * Author: Chris G. Demetriou 9 * 10 * Permission to use, copy, modify and distribute this software and 11 * its documentation is hereby granted, provided that both the copyright 12 * notice and this permission notice appear in all copies of the 13 * software, derivative works or modified versions, and any portions 14 * thereof, and that both notices appear in supporting documentation. 15 * 16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie the 28 * rights to redistribute these changes. 29 */ 30 31 #define __KVM_ALPHA_PRIVATE /* see <machine/pte.h> */ 32 33 #include <sys/types.h> 34 #include <sys/signal.h> 35 #include <sys/proc.h> 36 #include <sys/stat.h> 37 #include <sys/kcore.h> 38 #include <machine/kcore.h> 39 #include <unistd.h> 40 #include <stdlib.h> 41 #include <nlist.h> 42 #include <kvm.h> 43 44 #include <uvm/uvm_extern.h> 45 #include <machine/vmparam.h> 46 #include <machine/pmap.h> 47 48 #include <limits.h> 49 #include <db.h> 50 51 #include "kvm_private.h" 52 53 struct vmstate { 54 vsize_t page_shift; 55 }; 56 57 void 58 _kvm_freevtop(kvm_t *kd) 59 { 60 61 /* Not actually used for anything right now, but safe. */ 62 free(kd->vmst); 63 kd->vmst = NULL; 64 } 65 66 int 67 _kvm_initvtop(kvm_t *kd) 68 { 69 cpu_kcore_hdr_t *cpu_kh; 70 struct vmstate *vm; 71 72 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 73 if (vm == NULL) 74 return (-1); 75 76 cpu_kh = kd->cpu_data; 77 78 /* Compute page_shift. */ 79 for (vm->page_shift = 0; (1L << vm->page_shift) < cpu_kh->page_size; 80 vm->page_shift++) 81 /* nothing */ ; 82 if ((1L << vm->page_shift) != cpu_kh->page_size) { 83 free(vm); 84 return (-1); 85 } 86 87 kd->vmst = vm; 88 return (0); 89 } 90 91 int 92 _kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa) 93 { 94 cpu_kcore_hdr_t *cpu_kh; 95 struct vmstate *vm; 96 int rv, page_off; 97 alpha_pt_entry_t pte; 98 off_t pteoff; 99 100 if (!kd->vmst) { 101 _kvm_err(kd, 0, "vatop called before initvtop"); 102 return (0); 103 } 104 105 if (ISALIVE(kd)) { 106 _kvm_err(kd, 0, "vatop called in live kernel!"); 107 return (0); 108 } 109 110 cpu_kh = kd->cpu_data; 111 vm = kd->vmst; 112 page_off = va & (cpu_kh->page_size - 1); 113 114 #ifndef PAGE_SHIFT 115 #define PAGE_SHIFT vm->page_shift 116 #endif 117 118 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 119 /* 120 * Direct-mapped address: just convert it. 121 */ 122 123 *pa = ALPHA_K0SEG_TO_PHYS(va); 124 rv = cpu_kh->page_size - page_off; 125 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 126 /* 127 * Real kernel virtual address: do the translation. 128 */ 129 130 /* Find and read the L1 PTE. */ 131 pteoff = cpu_kh->lev1map_pa + 132 l1pte_index(va) * sizeof(alpha_pt_entry_t); 133 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), 134 (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 135 _kvm_syserr(kd, 0, "could not read L1 PTE"); 136 goto lose; 137 } 138 139 /* Find and read the L2 PTE. */ 140 if ((pte & ALPHA_PTE_VALID) == 0) { 141 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 142 goto lose; 143 } 144 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 145 l2pte_index(va) * sizeof(alpha_pt_entry_t); 146 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), 147 (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 148 _kvm_syserr(kd, 0, "could not read L2 PTE"); 149 goto lose; 150 } 151 152 /* Find and read the L3 PTE. */ 153 if ((pte & ALPHA_PTE_VALID) == 0) { 154 _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)"); 155 goto lose; 156 } 157 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 158 l3pte_index(va) * sizeof(alpha_pt_entry_t); 159 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), 160 (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 161 _kvm_syserr(kd, 0, "could not read L3 PTE"); 162 goto lose; 163 } 164 165 /* Fill in the PA. */ 166 if ((pte & ALPHA_PTE_VALID) == 0) { 167 _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)"); 168 goto lose; 169 } 170 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off; 171 rv = cpu_kh->page_size - page_off; 172 } else { 173 /* 174 * Bogus address (not in KV space): punt. 175 */ 176 177 _kvm_err(kd, 0, "invalid kernel virtual address"); 178 lose: 179 *pa = -1; 180 rv = 0; 181 } 182 183 return (rv); 184 } 185 186 /* 187 * Translate a physical address to a file-offset in the crash-dump. 188 */ 189 off_t 190 _kvm_pa2off(kvm_t *kd, paddr_t pa) 191 { 192 cpu_kcore_hdr_t *cpu_kh; 193 phys_ram_seg_t *ramsegs; 194 off_t off; 195 int i; 196 197 cpu_kh = kd->cpu_data; 198 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + _ALIGN(sizeof *cpu_kh)); 199 200 off = 0; 201 for (i = 0; i < cpu_kh->nmemsegs; i++) { 202 if (pa >= ramsegs[i].start && 203 (pa - ramsegs[i].start) < ramsegs[i].size) { 204 off += (pa - ramsegs[i].start); 205 break; 206 } 207 off += ramsegs[i].size; 208 } 209 return (kd->dump_off + off); 210 } 211