1 /* $OpenBSD: kvm_sparc64.c,v 1.8 2012/12/05 23:20:02 deraadt Exp $ */ 2 /* $NetBSD: kvm_sparc64.c,v 1.7 2001/08/05 03:33:15 matt Exp $ */ 3 4 /*- 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software developed by the Computer Systems 9 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 10 * BG 91-66 and contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 /* 38 * Sparc machine dependent routines for kvm. Hopefully, the forthcoming 39 * vm code will one day obsolete this module. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/exec.h> 44 #include <sys/user.h> 45 #include <sys/proc.h> 46 #include <sys/stat.h> 47 #include <sys/core.h> 48 #include <sys/kcore.h> 49 #include <unistd.h> 50 #include <nlist.h> 51 #include <kvm.h> 52 53 #include <uvm/uvm_extern.h> 54 55 #include <machine/vmparam.h> 56 #include <machine/pmap.h> 57 #include <machine/kcore.h> 58 59 #include <limits.h> 60 #include <db.h> 61 62 #include "kvm_private.h" 63 64 /* 65 * UltraSPARC T1 & T2 implement only a 40-bit real address range, just 66 * like older UltraSPARC CPUs. 67 */ 68 #define TLB_PA_MASK SUN4U_TLB_PA_MASK 69 70 int _kvm_kvatop(kvm_t *, u_long, u_long *); 71 72 void 73 _kvm_freevtop(kvm_t *kd) 74 { 75 if (kd->vmst != NULL) { 76 _kvm_err(kd, kd->program, "_kvm_freevtop: internal error"); 77 kd->vmst = NULL; 78 } 79 } 80 81 /* 82 * Prepare for translation of kernel virtual addresses into offsets 83 * into crash dump files. We use the MMU specific goop written at the 84 * front of the crash dump by pmap_dumpmmu(). 85 * 86 * We should read in and cache the ksegs here to speed up operations... 87 */ 88 int 89 _kvm_initvtop(kvm_t *kd) 90 { 91 kd->nbpg = 0x2000; 92 93 return (0); 94 } 95 96 /* 97 * Translate a kernel virtual address to a physical address using the 98 * mapping information in kd->vm. Returns the result in pa, and returns 99 * the number of bytes that are contiguously available from this 100 * physical address. This routine is used only for crashdumps. 101 */ 102 int 103 _kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa) 104 { 105 cpu_kcore_hdr_t *cpup = kd->cpu_data; 106 u_long kernbase = cpup->kernbase; 107 uint64_t *pseg, *pdir, *ptbl; 108 int64_t data; 109 110 if (va < kernbase) 111 goto lose; 112 113 /* Handle the wired 4MB TTEs */ 114 if (va > cpup->ktextbase && va < (cpup->ktextbase + cpup->ktextsz)) { 115 u_long vaddr; 116 117 vaddr = va - cpup->ktextbase; 118 *pa = cpup->ktextp + vaddr; 119 return (cpup->ktextsz - vaddr); 120 } 121 122 if (va > cpup->kdatabase && va < (cpup->kdatabase + cpup->kdatasz)) { 123 u_long vaddr; 124 125 vaddr = va - cpup->kdatabase; 126 *pa = cpup->kdatap + vaddr; 127 return (cpup->kdatasz - vaddr); 128 } 129 130 131 /* 132 * Parse kernel page table. 133 */ 134 pseg = (uint64_t *)(u_long)cpup->segmapoffset; 135 if (pread(kd->pmfd, &pdir, sizeof(pdir), 136 _kvm_pa2off(kd, (u_long)&pseg[va_to_seg(va)])) != sizeof(pdir)) { 137 _kvm_syserr(kd, 0, "could not read L1 PTE"); 138 goto lose; 139 } 140 141 if (!pdir) { 142 _kvm_err(kd, 0, "invalid L1 PTE"); 143 goto lose; 144 } 145 146 if (pread(kd->pmfd, &ptbl, sizeof(ptbl), 147 _kvm_pa2off(kd, (u_long)&pdir[va_to_dir(va)])) != sizeof(ptbl)) { 148 _kvm_syserr(kd, 0, "could not read L2 PTE"); 149 goto lose; 150 } 151 152 if (!ptbl) { 153 _kvm_err(kd, 0, "invalid L2 PTE"); 154 goto lose; 155 } 156 157 if (pread(kd->pmfd, &data, sizeof(data), 158 _kvm_pa2off(kd, (u_long)&ptbl[va_to_pte(va)])) != sizeof(data)) { 159 _kvm_syserr(kd, 0, "could not read TTE"); 160 goto lose; 161 } 162 163 if (data >= 0) { 164 _kvm_err(kd, 0, "invalid L2 TTE"); 165 goto lose; 166 } 167 168 /* 169 * Calculate page offsets and things. 170 * 171 * XXXX -- We could support multiple page sizes. 172 */ 173 va = va & (kd->nbpg - 1); 174 data &= TLB_PA_MASK; 175 *pa = data + va; 176 177 /* 178 * Parse and translate our TTE. 179 */ 180 return (kd->nbpg - va); 181 182 lose: 183 *pa = -1; 184 _kvm_err(kd, 0, "invalid address (%lx)", va); 185 return (0); 186 } 187 188 189 /* 190 * Translate a physical address to a file-offset in the crash-dump. 191 */ 192 off_t 193 _kvm_pa2off(kvm_t *kd, paddr_t pa) 194 { 195 cpu_kcore_hdr_t *cpup = kd->cpu_data; 196 phys_ram_seg_t *mp; 197 off_t off; 198 int nmem; 199 200 /* 201 * Layout of CPU segment: 202 * cpu_kcore_hdr_t; 203 * [alignment] 204 * phys_ram_seg_t[cpup->nmemseg]; 205 */ 206 mp = (phys_ram_seg_t *)((long)kd->cpu_data + cpup->memsegoffset); 207 off = 0; 208 209 /* Translate (sparse) pfnum to (packed) dump offset */ 210 for (nmem = cpup->nmemseg; --nmem >= 0; mp++) { 211 if (mp->start <= pa && pa < mp->start + mp->size) 212 break; 213 off += mp->size; 214 } 215 if (nmem < 0) { 216 _kvm_err(kd, 0, "invalid address (%lx)", pa); 217 return (-1); 218 } 219 220 return (kd->dump_off + off + pa - mp->start); 221 } 222