1 /* $OpenBSD: kvm_alpha.c,v 1.16 2015/12/19 18:40:30 mmcc 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/param.h> 34 #include <sys/proc.h> 35 #include <sys/stat.h> 36 #include <sys/kcore.h> 37 #include <machine/kcore.h> 38 #include <unistd.h> 39 #include <stdlib.h> 40 #include <nlist.h> 41 #include <kvm.h> 42 43 #include <uvm/uvm_extern.h> 44 #include <machine/vmparam.h> 45 #include <machine/pmap.h> 46 47 #include <limits.h> 48 #include <db.h> 49 50 #include "kvm_private.h" 51 52 struct vmstate { 53 vsize_t page_shift; 54 }; 55 56 void 57 _kvm_freevtop(kvm_t *kd) 58 { 59 60 /* Not actually used for anything right now, but safe. */ 61 free(kd->vmst); 62 kd->vmst = NULL; 63 } 64 65 int 66 _kvm_initvtop(kvm_t *kd) 67 { 68 cpu_kcore_hdr_t *cpu_kh; 69 struct vmstate *vm; 70 71 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 72 if (vm == NULL) 73 return (-1); 74 75 cpu_kh = kd->cpu_data; 76 77 /* Compute page_shift. */ 78 for (vm->page_shift = 0; (1L << vm->page_shift) < cpu_kh->page_size; 79 vm->page_shift++) 80 /* nothing */ ; 81 if ((1L << vm->page_shift) != cpu_kh->page_size) { 82 free(vm); 83 return (-1); 84 } 85 86 kd->vmst = vm; 87 return (0); 88 } 89 90 int 91 _kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa) 92 { 93 cpu_kcore_hdr_t *cpu_kh; 94 struct vmstate *vm; 95 int rv, page_off; 96 alpha_pt_entry_t pte; 97 off_t pteoff; 98 99 if (!kd->vmst) { 100 _kvm_err(kd, 0, "vatop called before initvtop"); 101 return (0); 102 } 103 104 if (ISALIVE(kd)) { 105 _kvm_err(kd, 0, "vatop called in live kernel!"); 106 return (0); 107 } 108 109 cpu_kh = kd->cpu_data; 110 vm = kd->vmst; 111 page_off = va & (cpu_kh->page_size - 1); 112 113 #ifndef PAGE_SHIFT 114 #define PAGE_SHIFT vm->page_shift 115 #endif 116 117 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 118 /* 119 * Direct-mapped address: just convert it. 120 */ 121 122 *pa = ALPHA_K0SEG_TO_PHYS(va); 123 rv = cpu_kh->page_size - page_off; 124 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 125 /* 126 * Real kernel virtual address: do the translation. 127 */ 128 129 /* Find and read the L1 PTE. */ 130 pteoff = cpu_kh->lev1map_pa + 131 l1pte_index(va) * sizeof(alpha_pt_entry_t); 132 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), 133 (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 134 _kvm_syserr(kd, 0, "could not read L1 PTE"); 135 goto lose; 136 } 137 138 /* Find and read the L2 PTE. */ 139 if ((pte & ALPHA_PTE_VALID) == 0) { 140 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 141 goto lose; 142 } 143 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 144 l2pte_index(va) * sizeof(alpha_pt_entry_t); 145 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), 146 (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 147 _kvm_syserr(kd, 0, "could not read L2 PTE"); 148 goto lose; 149 } 150 151 /* Find and read the L3 PTE. */ 152 if ((pte & ALPHA_PTE_VALID) == 0) { 153 _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)"); 154 goto lose; 155 } 156 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 157 l3pte_index(va) * sizeof(alpha_pt_entry_t); 158 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), 159 (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 160 _kvm_syserr(kd, 0, "could not read L3 PTE"); 161 goto lose; 162 } 163 164 /* Fill in the PA. */ 165 if ((pte & ALPHA_PTE_VALID) == 0) { 166 _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)"); 167 goto lose; 168 } 169 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off; 170 rv = cpu_kh->page_size - page_off; 171 } else { 172 /* 173 * Bogus address (not in KV space): punt. 174 */ 175 176 _kvm_err(kd, 0, "invalid kernel virtual address"); 177 lose: 178 *pa = -1; 179 rv = 0; 180 } 181 182 return (rv); 183 } 184 185 /* 186 * Translate a physical address to a file-offset in the crash-dump. 187 */ 188 off_t 189 _kvm_pa2off(kvm_t *kd, paddr_t pa) 190 { 191 cpu_kcore_hdr_t *cpu_kh; 192 phys_ram_seg_t *ramsegs; 193 off_t off; 194 int i; 195 196 cpu_kh = kd->cpu_data; 197 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh)); 198 199 off = 0; 200 for (i = 0; i < cpu_kh->nmemsegs; i++) { 201 if (pa >= ramsegs[i].start && 202 (pa - ramsegs[i].start) < ramsegs[i].size) { 203 off += (pa - ramsegs[i].start); 204 break; 205 } 206 off += ramsegs[i].size; 207 } 208 return (kd->dump_off + off); 209 } 210