kvm_sparc64.c revision 1.11 
1/*	$NetBSD: kvm_sparc64.c,v 1.11 2007/11/05 00:46:23 martin 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
39static char sccsid[] = "@(#)kvm_sparc.c	8.1 (Berkeley) 6/4/93";
40#else
41__RCSID("$NetBSD: kvm_sparc64.c,v 1.11 2007/11/05 00:46:23 martin 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/user.h>
53#include <sys/proc.h>
54#include <sys/stat.h>
55#include <sys/core.h>
56#include <sys/kcore.h>
57#include <unistd.h>
58#include <nlist.h>
59#include <kvm.h>
60
61#include <uvm/uvm_extern.h>
62
63#include <machine/pmap.h>
64#include <machine/kcore.h>
65#include <machine/vmparam.h>
66
67#include <limits.h>
68#include <db.h>
69
70#include "kvm_private.h"
71
72int _kvm_kvatop __P((kvm_t *, u_long, u_long *));
73
74void
75_kvm_freevtop(kd)
76	kvm_t *kd;
77{
78	if (kd->vmst != 0) {
79		_kvm_err(kd, kd->program, "_kvm_freevtop: internal error");
80		kd->vmst = 0;
81	}
82}
83
84/*
85 * Prepare for translation of kernel virtual addresses into offsets
86 * into crash dump files. We use the MMU specific goop written at the
87 * front of the crash dump by pmap_dumpmmu().
88 *
89 * We should read in and cache the ksegs here to speed up operations...
90 */
91int
92_kvm_initvtop(kd)
93	kvm_t *kd;
94{
95	kd->nbpg = 0x2000;
96
97	return (0);
98}
99
100/*
101 * Translate a kernel virtual address to a physical address using the
102 * mapping information in kd->vm.  Returns the result in pa, and returns
103 * the number of bytes that are contiguously available from this
104 * physical address.  This routine is used only for crash dumps.
105 */
106int
107_kvm_kvatop(kd, va, pa)
108	kvm_t *kd;
109	u_long va;
110	u_long *pa;
111{
112	cpu_kcore_hdr_t *cpup = kd->cpu_data;
113	u_long kernbase = cpup->kernbase;
114	uint64_t *pseg, *pdir, *ptbl;
115	struct cpu_kcore_4mbseg *ktlb;
116	int64_t data;
117	int i;
118
119	if (va < kernbase)
120		goto lose;
121
122	/* Handle the wired 4MB TTEs */
123	if (cpup->memsegoffset > sizeof(cpu_kcore_hdr_t) &&
124	    cpup->newmagic == SPARC64_KCORE_NEWMAGIC) {
125		/*
126		 * new format: we have a list of 4 MB mappings
127		 */
128		ktlb = (struct cpu_kcore_4mbseg *)
129			((uintptr_t)kd->cpu_data + cpup->off4mbsegs);
130		for (i = 0; i < cpup->num4mbsegs; i++) {
131			uint64_t start = ktlb[i].va;
132			if (va < start || va >= start+PAGE_SIZE_4M)
133				continue;
134			*pa = ktlb[i].pa + va - start;
135			return (int)(start+PAGE_SIZE_4M - va);
136		}
137
138	} else {
139		/*
140		 * old format: just a textbase/size and database/size
141		 */
142		if (va > cpup->ktextbase && va <
143		    (cpup->ktextbase + cpup->ktextsz)) {
144			u_long vaddr;
145
146			vaddr = va - cpup->ktextbase;
147			*pa = cpup->ktextp + vaddr;
148			return (int)(cpup->ktextsz - vaddr);
149		}
150		if (va > cpup->kdatabase && va <
151		    (cpup->kdatabase + cpup->kdatasz)) {
152			u_long vaddr;
153
154			vaddr = va - cpup->kdatabase;
155			*pa = cpup->kdatap + vaddr;
156			return (int)(cpup->kdatasz - vaddr);
157		}
158	}
159
160	/*
161	 * Parse kernel page table.
162	 */
163	pseg = (uint64_t *)(u_long)cpup->segmapoffset;
164	if (pread(kd->pmfd, &pdir, sizeof(pdir),
165		_kvm_pa2off(kd, (u_long)&pseg[va_to_seg(va)]))
166		!= sizeof(pdir)) {
167		_kvm_syserr(kd, 0, "could not read L1 PTE");
168		goto lose;
169	}
170
171	if (!pdir) {
172		_kvm_err(kd, 0, "invalid L1 PTE");
173		goto lose;
174	}
175
176	if (pread(kd->pmfd, &ptbl, sizeof(ptbl),
177		_kvm_pa2off(kd, (u_long)&pdir[va_to_dir(va)]))
178		!= sizeof(ptbl)) {
179		_kvm_syserr(kd, 0, "could not read L2 PTE");
180		goto lose;
181	}
182
183	if (!ptbl) {
184		_kvm_err(kd, 0, "invalid L2 PTE");
185		goto lose;
186	}
187
188	if (pread(kd->pmfd, &data, sizeof(data),
189		_kvm_pa2off(kd, (u_long)&ptbl[va_to_pte(va)]))
190		!= sizeof(data)) {
191		_kvm_syserr(kd, 0, "could not read TTE");
192		goto lose;
193	}
194
195	if (data >= 0) {
196		_kvm_err(kd, 0, "invalid L2 TTE");
197		goto lose;
198	}
199
200	/*
201	 * Calculate page offsets and things.
202	 *
203	 * XXXX -- We could support multiple page sizes.
204	 */
205	va = va & (kd->nbpg - 1);
206	data &= TLB_PA_MASK;
207	*pa = data + va;
208
209	/*
210	 * Parse and trnslate our TTE.
211	 */
212
213	return (int)(kd->nbpg - va);
214
215lose:
216	*pa = (u_long)-1;
217	_kvm_err(kd, 0, "invalid address (%lx)", va);
218	return (0);
219}
220
221
222/*
223 * Translate a physical address to a file-offset in the crash dump.
224 */
225off_t
226_kvm_pa2off(kd, pa)
227	kvm_t   *kd;
228	u_long  pa;
229{
230	cpu_kcore_hdr_t *cpup = kd->cpu_data;
231	phys_ram_seg_t *mp;
232	off_t off;
233	int nmem;
234
235	/*
236	 * Layout of CPU segment:
237	 *	cpu_kcore_hdr_t;
238	 *	[alignment]
239	 *	phys_ram_seg_t[cpup->nmemseg];
240	 */
241	mp = (phys_ram_seg_t *)((long)kd->cpu_data + cpup->memsegoffset);
242	off = 0;
243
244	/* Translate (sparse) pfnum to (packed) dump offset */
245	for (nmem = cpup->nmemseg; --nmem >= 0; mp++) {
246		if (mp->start <= pa && pa < mp->start + mp->size)
247			break;
248		off += mp->size;
249	}
250	if (nmem < 0) {
251		_kvm_err(kd, 0, "invalid address (%lx)", pa);
252		return (-1);
253	}
254
255	return (kd->dump_off + off + pa - mp->start);
256}
257
258/*
259 * Machine-dependent initialization for ALL open kvm descriptors,
260 * not just those for a kernel crash dump.  Some architectures
261 * have to deal with these NOT being constants!  (i.e. m68k)
262 */
263int
264_kvm_mdopen(kd)
265	kvm_t	*kd;
266{
267	u_long max_uva;
268	extern struct ps_strings *__ps_strings;
269
270	max_uva = (u_long) (__ps_strings + 1);
271	kd->usrstack = max_uva;
272	kd->max_uva  = max_uva;
273	kd->min_uva  = 0;
274
275	return (0);
276}
277