1 /* $NetBSD: kvm_m68k.c,v 1.9 1996/05/07 06:09:11 leo Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software developed by the Computer Systems 8 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 9 * BG 91-66 and contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 static char *rcsid = "$NetBSD: kvm_m68k.c,v 1.9 1996/05/07 06:09:11 leo Exp $"; 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 /* 49 * m68k machine dependent routines for kvm. Hopefully, the forthcoming 50 * vm code will one day obsolete this module. 51 */ 52 53 #include <sys/param.h> 54 #include <sys/user.h> 55 #include <sys/proc.h> 56 #include <sys/stat.h> 57 58 #include <sys/core.h> 59 #include <sys/exec_aout.h> 60 #include <sys/kcore.h> 61 62 #include <unistd.h> 63 #include <limits.h> 64 #include <nlist.h> 65 #include <kvm.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_param.h> 69 70 #include <db.h> 71 72 #include "kvm_private.h" 73 74 #include <machine/pte.h> 75 #include <machine/kcore.h> 76 77 #ifndef btop 78 #define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */ 79 #define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */ 80 #endif 81 82 #define KREAD(kd, addr, p)\ 83 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 84 85 void 86 _kvm_freevtop(kd) 87 kvm_t *kd; 88 { 89 if (kd->vmst != 0) 90 free(kd->vmst); 91 } 92 93 int 94 _kvm_initvtop(kd) 95 kvm_t *kd; 96 { 97 return (0); 98 } 99 100 static int 101 _kvm_vatop(kd, sta, va, pa) 102 kvm_t *kd; 103 st_entry_t *sta; 104 u_long va; 105 u_long *pa; 106 { 107 register cpu_kcore_hdr_t *cpu_kh; 108 register u_long addr; 109 int p, ste, pte; 110 int offset; 111 112 if (ISALIVE(kd)) { 113 _kvm_err(kd, 0, "vatop called in live kernel!"); 114 return((off_t)0); 115 } 116 offset = va & PGOFSET; 117 cpu_kh = kd->cpu_data; 118 /* 119 * If we are initializing (kernel segment table pointer not yet set) 120 * then return pa == va to avoid infinite recursion. 121 */ 122 if (cpu_kh->sysseg_pa == 0) { 123 *pa = va + cpu_kh->kernel_pa; 124 return (NBPG - offset); 125 } 126 if (cpu_kh->mmutype == -2) { 127 st_entry_t *sta2; 128 129 addr = (u_long)&sta[va >> SG4_SHIFT1]; 130 /* 131 * Can't use KREAD to read kernel segment table entries. 132 * Fortunately it is 1-to-1 mapped so we don't have to. 133 */ 134 if (sta == cpu_kh->sysseg_pa) { 135 if (lseek(kd->pmfd, _kvm_pa2off(kd, addr), 0) == -1 || 136 read(kd->pmfd, (char *)&ste, sizeof(ste)) < 0) 137 goto invalid; 138 } else if (KREAD(kd, addr, &ste)) 139 goto invalid; 140 if ((ste & SG_V) == 0) { 141 _kvm_err(kd, 0, "invalid level 1 descriptor (%x)", 142 ste); 143 return((off_t)0); 144 } 145 sta2 = (st_entry_t *)(ste & SG4_ADDR1); 146 addr = (u_long)&sta2[(va & SG4_MASK2) >> SG4_SHIFT2]; 147 /* 148 * Address from level 1 STE is a physical address, 149 * so don't use kvm_read. 150 */ 151 if (lseek(kd->pmfd, _kvm_pa2off(kd, addr), 0) == -1 || 152 read(kd->pmfd, (char *)&ste, sizeof(ste)) < 0) 153 goto invalid; 154 if ((ste & SG_V) == 0) { 155 _kvm_err(kd, 0, "invalid level 2 descriptor (%x)", 156 ste); 157 return((off_t)0); 158 } 159 sta2 = (st_entry_t *)(ste & SG4_ADDR2); 160 addr = (u_long)&sta2[(va & SG4_MASK3) >> SG4_SHIFT3]; 161 } else { 162 addr = (u_long)&sta[va >> SEGSHIFT]; 163 /* 164 * Can't use KREAD to read kernel segment table entries. 165 * Fortunately it is 1-to-1 mapped so we don't have to. 166 */ 167 if (sta == cpu_kh->sysseg_pa) { 168 if (lseek(kd->pmfd, _kvm_pa2off(kd, addr), 0) == -1 || 169 read(kd->pmfd, (char *)&ste, sizeof(ste)) < 0) 170 goto invalid; 171 } else if (KREAD(kd, addr, &ste)) 172 goto invalid; 173 if ((ste & SG_V) == 0) { 174 _kvm_err(kd, 0, "invalid segment (%x)", ste); 175 return((off_t)0); 176 } 177 p = btop(va & SG_PMASK); 178 addr = (ste & SG_FRAME) + (p * sizeof(pt_entry_t)); 179 } 180 /* 181 * Address from STE is a physical address so don't use kvm_read. 182 */ 183 if (lseek(kd->pmfd, _kvm_pa2off(kd, addr), 0) == -1 || 184 read(kd->pmfd, (char *)&pte, sizeof(pte)) < 0) 185 goto invalid; 186 addr = pte & PG_FRAME; 187 if (pte == PG_NV) { 188 _kvm_err(kd, 0, "page not valid"); 189 return (0); 190 } 191 *pa = addr + offset; 192 193 return (NBPG - offset); 194 invalid: 195 _kvm_err(kd, 0, "invalid address (%x)", va); 196 return (0); 197 } 198 199 int 200 _kvm_kvatop(kd, va, pa) 201 kvm_t *kd; 202 u_long va; 203 u_long *pa; 204 { 205 register cpu_kcore_hdr_t *cpu_kh; 206 207 cpu_kh = kd->cpu_data; 208 return (_kvm_vatop(kd, (u_long)cpu_kh->sysseg_pa, va, pa)); 209 } 210 211 /* 212 * Translate a physical address to a file-offset in the crash-dump. 213 */ 214 off_t 215 _kvm_pa2off(kd, pa) 216 kvm_t *kd; 217 u_long pa; 218 { 219 off_t off; 220 phys_ram_seg_t *rsp; 221 register cpu_kcore_hdr_t *cpu_kh; 222 223 cpu_kh = kd->cpu_data; 224 off = 0; 225 for (rsp = cpu_kh->ram_segs; rsp->size; rsp++) { 226 if (pa >= rsp->start && pa < rsp->start + rsp->size) { 227 pa -= rsp->start; 228 break; 229 } 230 off += rsp->size; 231 } 232 return(kd->dump_off + off + pa); 233 } 234