1 /* $NetBSD: kvm_sparc64.c,v 1.19 2023/08/23 14:00:11 rin Exp $ */
2
3 /*-
4 * Copyright (c) 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. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #if defined(LIBC_SCCS) && !defined(lint)
38 #if 0
39 static char sccsid[] = "@(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93";
40 #else
41 __RCSID("$NetBSD: kvm_sparc64.c,v 1.19 2023/08/23 14:00:11 rin Exp $");
42 #endif
43 #endif /* LIBC_SCCS and not lint */
44
45 /*
46 * Sparc machine dependent routines for kvm. Hopefully, the forthcoming
47 * vm code will one day obsolete this module.
48 */
49
50 #include <sys/param.h>
51 #include <sys/exec.h>
52 #include <sys/proc.h>
53 #include <sys/stat.h>
54 #include <sys/core.h>
55 #include <sys/kcore.h>
56 #include <sys/types.h>
57
58 #include <unistd.h>
59 #include <nlist.h>
60 #include <kvm.h>
61
62 #include <uvm/uvm_extern.h>
63
64 #include <machine/pmap.h>
65 #include <machine/kcore.h>
66 #include <machine/vmparam.h>
67 #include <machine/param.h>
68
69 #include <limits.h>
70 #include <db.h>
71
72 #include "kvm_private.h"
73
74 void
_kvm_freevtop(kvm_t * kd)75 _kvm_freevtop(kvm_t *kd)
76 {
77 if (kd->vmst != 0) {
78 _kvm_err(kd, kd->program, "_kvm_freevtop: internal error");
79 kd->vmst = 0;
80 }
81 }
82
83 /*
84 * Prepare for translation of kernel virtual addresses into offsets
85 * into crash dump files. We use the MMU specific goop written at the
86 * front of the crash dump by pmap_dumpmmu().
87 *
88 * We should read in and cache the ksegs here to speed up operations...
89 */
90 int
_kvm_initvtop(kvm_t * kd)91 _kvm_initvtop(kvm_t *kd)
92 {
93 kd->nbpg = 0x2000;
94
95 return (0);
96 }
97
98 /*
99 * Translate a kernel virtual address to a physical address using the
100 * mapping information in kd->vm. Returns the result in pa, and returns
101 * the number of bytes that are contiguously available from this
102 * physical address. This routine is used only for crash dumps.
103 */
104 int
_kvm_kvatop(kvm_t * kd,vaddr_t va,paddr_t * pa)105 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
106 {
107 cpu_kcore_hdr_t *cpup = kd->cpu_data;
108 u_long kernbase = cpup->kernbase;
109 uint64_t *pseg, *pdir, *ptbl;
110 struct cpu_kcore_4mbseg *ktlb;
111 int64_t data;
112 int i;
113
114 if (va < kernbase)
115 goto lose;
116
117 /* Handle the wired 4MB TTEs and per-CPU mappings */
118 if (cpup->memsegoffset > sizeof(cpu_kcore_hdr_t) &&
119 cpup->newmagic == SPARC64_KCORE_NEWMAGIC) {
120 /*
121 * new format: we have a list of 4 MB mappings
122 */
123 ktlb = (struct cpu_kcore_4mbseg *)
124 ((uintptr_t)kd->cpu_data + cpup->off4mbsegs);
125 for (i = 0; i < cpup->num4mbsegs; i++) {
126 uint64_t start = ktlb[i].va;
127 if (va < start || va >= start+PAGE_SIZE_4M)
128 continue;
129 *pa = ktlb[i].pa + va - start;
130 return (int)(start+PAGE_SIZE_4M - va);
131 }
132
133 if (cpup->numcpuinfos > 0) {
134 /* we have per-CPU mapping info */
135 uint64_t start, base;
136
137 base = cpup->cpubase - 32*1024;
138 if (va >= base && va < (base + cpup->percpusz)) {
139 start = va - base;
140 *pa = cpup->cpusp
141 + cpup->thiscpu*cpup->percpusz
142 + start;
143 return cpup->percpusz - start;
144 }
145 }
146 } else {
147 /*
148 * old format: just a textbase/size and database/size
149 */
150 if (va > cpup->ktextbase && va <
151 (cpup->ktextbase + cpup->ktextsz)) {
152 u_long vaddr;
153
154 vaddr = va - cpup->ktextbase;
155 *pa = cpup->ktextp + vaddr;
156 return (int)(cpup->ktextsz - vaddr);
157 }
158 if (va > cpup->kdatabase && va <
159 (cpup->kdatabase + cpup->kdatasz)) {
160 u_long vaddr;
161
162 vaddr = va - cpup->kdatabase;
163 *pa = cpup->kdatap + vaddr;
164 return (int)(cpup->kdatasz - vaddr);
165 }
166 }
167
168 /*
169 * Parse kernel page table.
170 */
171 pseg = (uint64_t *)(u_long)cpup->segmapoffset;
172 if (_kvm_pread(kd, kd->pmfd, &pdir, sizeof(pdir),
173 _kvm_pa2off(kd, (paddr_t)&pseg[va_to_seg(va)]))
174 != sizeof(pdir)) {
175 _kvm_syserr(kd, 0, "could not read L1 PTE");
176 goto lose;
177 }
178
179 if (!pdir) {
180 _kvm_err(kd, 0, "invalid L1 PTE");
181 goto lose;
182 }
183
184 if (_kvm_pread(kd, kd->pmfd, &ptbl, sizeof(ptbl),
185 _kvm_pa2off(kd, (paddr_t)&pdir[va_to_dir(va)]))
186 != sizeof(ptbl)) {
187 _kvm_syserr(kd, 0, "could not read L2 PTE");
188 goto lose;
189 }
190
191 if (!ptbl) {
192 _kvm_err(kd, 0, "invalid L2 PTE");
193 goto lose;
194 }
195
196 if (_kvm_pread(kd, kd->pmfd, &data, sizeof(data),
197 _kvm_pa2off(kd, (paddr_t)&ptbl[va_to_pte(va)]))
198 != sizeof(data)) {
199 _kvm_syserr(kd, 0, "could not read TTE");
200 goto lose;
201 }
202
203 if (data >= 0) {
204 _kvm_err(kd, 0, "invalid L2 TTE");
205 goto lose;
206 }
207
208 /*
209 * Calculate page offsets and things.
210 *
211 * XXXX -- We could support multiple page sizes.
212 */
213 va = va & (kd->nbpg - 1);
214 data &= SUN4U_TLB_PA_MASK; /* XXX handle sun4u/sun4v */
215 *pa = data + va;
216
217 /*
218 * Parse and trnslate our TTE.
219 */
220
221 return (int)(kd->nbpg - va);
222
223 lose:
224 *pa = (u_long)-1;
225 _kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
226 return (0);
227 }
228
229
230 /*
231 * Translate a physical address to a file-offset in the crash dump.
232 */
233 off_t
_kvm_pa2off(kvm_t * kd,paddr_t pa)234 _kvm_pa2off(kvm_t *kd, paddr_t pa)
235 {
236 cpu_kcore_hdr_t *cpup = kd->cpu_data;
237 phys_ram_seg_t *mp;
238 off_t off;
239 int nmem;
240
241 /*
242 * Layout of CPU segment:
243 * cpu_kcore_hdr_t;
244 * [alignment]
245 * phys_ram_seg_t[cpup->nmemseg];
246 */
247 mp = (phys_ram_seg_t *)((long)kd->cpu_data + cpup->memsegoffset);
248 off = 0;
249
250 /* Translate (sparse) pfnum to (packed) dump offset */
251 for (nmem = cpup->nmemseg; --nmem >= 0; mp++) {
252 if (mp->start <= pa && pa < mp->start + mp->size)
253 break;
254 off += mp->size;
255 }
256 if (nmem < 0) {
257 _kvm_err(kd, 0, "invalid address (%#"PRIxPADDR")", pa);
258 return (-1);
259 }
260
261 return (kd->dump_off + off + pa - mp->start);
262 }
263
264 /*
265 * Machine-dependent initialization for ALL open kvm descriptors,
266 * not just those for a kernel crash dump. Some architectures
267 * have to deal with these NOT being constants! (i.e. m68k)
268 */
269 int
_kvm_mdopen(kvm_t * kd)270 _kvm_mdopen(kvm_t *kd)
271 {
272 u_long max_uva;
273 extern struct ps_strings *__ps_strings;
274
275 max_uva = (u_long) (__ps_strings + 1);
276 kd->max_uva = max_uva;
277 kd->min_uva = 0;
278
279 return (0);
280 }
281