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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libkvm/kvm_amd64.c	Lines:	0	64	0.0 %
Date:	2017-11-07	Branches:	0	30	0.0 %


/*	$OpenBSD: kvm_amd64.c,v 1.13 2015/12/19 18:40:30 mmcc Exp $	*/
/*	$NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $	*/

/*-
 * Copyright (c) 1989, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software developed by the Computer Systems
 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
 * BG 91-66 and contributed to Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * x86-64 machine dependent routines for kvm.
 */

#include <sys/param.h>	/* MAXCOMLEN */
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <machine/kcore.h>
#include <stdlib.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>

#include <uvm/uvm_extern.h>

#include <limits.h>
#include <db.h>

#include "kvm_private.h"

#include <machine/pmap.h>
#include <machine/pte.h>
#include <machine/vmparam.h>

void
_kvm_freevtop(kvm_t *kd)
{
	/* Not actually used for anything right now, but safe. */
	free(kd->vmst);
	kd->vmst = NULL;
}

/*ARGSUSED*/
int
_kvm_initvtop(kvm_t *kd)
{

	return (0);
}

/*
 * Translate a kernel virtual address to a physical address.
 */
int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
	cpu_kcore_hdr_t *cpu_kh;
	paddr_t pde_pa, pte_pa;
	u_long page_off;
	pd_entry_t pde;
	pt_entry_t pte;

	if (ISALIVE(kd)) {
		_kvm_err(kd, 0, "vatop called in live kernel!");
		return (0);
	}

	page_off = va & (kd->nbpg - 1);

	if (va >= PMAP_DIRECT_BASE && va <= PMAP_DIRECT_END) {
		*pa = va - PMAP_DIRECT_BASE;
		return (int)(kd->nbpg - page_off);
	}

	cpu_kh = kd->cpu_data;

	/*
	 * Find and read all entries to get to the pa.
	 */

	/*
	 * Level 4.
	 */
	pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t));
	if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
	    _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
		_kvm_syserr(kd, 0, "could not read PT level 4 entry");
		goto lose;
	}
	if ((pde & PG_V) == 0) {
		_kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)");
		goto lose;
	}

	/*
	 * Level 3.
	 */
	pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t));
	if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
	    _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
		_kvm_syserr(kd, 0, "could not read PT level 3 entry");
		goto lose;
	}
	if ((pde & PG_V) == 0) {
		_kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)");
		goto lose;
	}

	/*
	 * Level 2.
	 */
	pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t));
	if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
	    _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
		_kvm_syserr(kd, 0, "could not read PT level 2 entry");
		goto lose;
	}
	if ((pde & PG_V) == 0) {
		_kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)");
		goto lose;
	}

	/*
	 * Might be a large page.
	 */
	if ((pde & PG_PS) != 0) {
		page_off = va & (NBPD_L2 - 1);
		*pa = (pde & PG_LGFRAME) | page_off;
		return (int)(NBPD_L2 - page_off);
	}

	/*
	 * Level 1.
	 */
	pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
	if (pread(kd->pmfd, (void *) &pte, sizeof(pte),
	    _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
		_kvm_syserr(kd, 0, "could not read PTE");
		goto lose;
	}
	/*
	 * Validate the PTE and return the physical address.
	 */
	if ((pte & PG_V) == 0) {
		_kvm_err(kd, 0, "invalid translation (invalid PTE)");
		goto lose;
	}
	*pa = (pte & PG_FRAME) + page_off;
	return (int)(kd->nbpg - page_off);

 lose:
	*pa = (u_long)~0L;
	return (0);
}

/*
 * Translate a physical address to a file-offset in the crash dump.
 */
off_t
_kvm_pa2off(kvm_t *kd, paddr_t pa)
{
	cpu_kcore_hdr_t *cpu_kh;
	phys_ram_seg_t *ramsegs;
	off_t off;
	int i;

	cpu_kh = kd->cpu_data;
	ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh));

	off = 0;
	for (i = 0; i < cpu_kh->nmemsegs; i++) {
		if (pa >= ramsegs[i].start &&
		    (pa - ramsegs[i].start) < ramsegs[i].size) {
			off += (pa - ramsegs[i].start);
			break;
		}
		off += ramsegs[i].size;
	}

	if (i == cpu_kh->nmemsegs)
		_kvm_err(kd, 0, "pa %lx not in dump", pa);

	return (kd->dump_off + off);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: kvm_amd64.c,v 1.13 2015/12/19 18:40:30 mmcc Exp $ */
2			/* $NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $ */
3
4			/*-
5			* Copyright (c) 1989, 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			* x86-64 machine dependent routines for kvm.
39			*/
40
41			#include <sys/param.h> /* MAXCOMLEN */
42			#include <sys/proc.h>
43			#include <sys/stat.h>
44			#include <sys/kcore.h>
45			#include <machine/kcore.h>
46			#include <stdlib.h>
47			#include <unistd.h>
48			#include <nlist.h>
49			#include <kvm.h>
50
51			#include <uvm/uvm_extern.h>
52
53			#include <limits.h>
54			#include <db.h>
55
56			#include "kvm_private.h"
57
58			#include <machine/pmap.h>
59			#include <machine/pte.h>
60			#include <machine/vmparam.h>
61
62			void
63			_kvm_freevtop(kvm_t *kd)
64			{
65			/* Not actually used for anything right now, but safe. */
66			free(kd->vmst);
67			kd->vmst = NULL;
68			}
69
70			/ARGSUSED/
71			int
72			_kvm_initvtop(kvm_t *kd)
73			{
74
75			return (0);
76			}
77
78			/*
79			* Translate a kernel virtual address to a physical address.
80			*/
81			int
82			_kvm_kvatop(kvm_t kd, u_long va, paddr_t pa)
83			{
84			cpu_kcore_hdr_t *cpu_kh;
85			paddr_t pde_pa, pte_pa;
86			u_long page_off;
87			pd_entry_t pde;
88			pt_entry_t pte;
89
90			if (ISALIVE(kd)) {
91			_kvm_err(kd, 0, "vatop called in live kernel!");
92			return (0);
93			}
94
95			page_off = va & (kd->nbpg - 1);
96
97			if (va >= PMAP_DIRECT_BASE && va <= PMAP_DIRECT_END) {
98			*pa = va - PMAP_DIRECT_BASE;
99			return (int)(kd->nbpg - page_off);
100			}
101
102			cpu_kh = kd->cpu_data;
103
104			/*
105			* Find and read all entries to get to the pa.
106			*/
107
108			/*
109			* Level 4.
110			*/
111			pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t));
112			if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
113			_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
114			_kvm_syserr(kd, 0, "could not read PT level 4 entry");
115			goto lose;
116			}
117			if ((pde & PG_V) == 0) {
118			_kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)");
119			goto lose;
120			}
121
122			/*
123			* Level 3.
124			*/
125			pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t));
126			if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
127			_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
128			_kvm_syserr(kd, 0, "could not read PT level 3 entry");
129			goto lose;
130			}
131			if ((pde & PG_V) == 0) {
132			_kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)");
133			goto lose;
134			}
135
136			/*
137			* Level 2.
138			*/
139			pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t));
140			if (pread(kd->pmfd, (void *)&pde, sizeof(pde),
141			_kvm_pa2off(kd, pde_pa)) != sizeof(pde)) {
142			_kvm_syserr(kd, 0, "could not read PT level 2 entry");
143			goto lose;
144			}
145			if ((pde & PG_V) == 0) {
146			_kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)");
147			goto lose;
148			}
149
150			/*
151			* Might be a large page.
152			*/
153			if ((pde & PG_PS) != 0) {
154			page_off = va & (NBPD_L2 - 1);
155			*pa = (pde & PG_LGFRAME) \| page_off;
156			return (int)(NBPD_L2 - page_off);
157			}
158
159			/*
160			* Level 1.
161			*/
162			pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
163			if (pread(kd->pmfd, (void *) &pte, sizeof(pte),
164			_kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
165			_kvm_syserr(kd, 0, "could not read PTE");
166			goto lose;
167			}
168			/*
169			* Validate the PTE and return the physical address.
170			*/
171			if ((pte & PG_V) == 0) {
172			_kvm_err(kd, 0, "invalid translation (invalid PTE)");
173			goto lose;
174			}
175			*pa = (pte & PG_FRAME) + page_off;
176			return (int)(kd->nbpg - page_off);
177
178			lose:
179			*pa = (u_long)~0L;
180			return (0);
181			}
182
183			/*
184			* Translate a physical address to a file-offset in the crash dump.
185			*/
186			off_t
187			_kvm_pa2off(kvm_t *kd, paddr_t pa)
188			{
189			cpu_kcore_hdr_t *cpu_kh;
190			phys_ram_seg_t *ramsegs;
191			off_t off;
192			int i;
193
194			cpu_kh = kd->cpu_data;
195			ramsegs = (void )((char )(void )cpu_kh + ALIGN(sizeof cpu_kh));
196
197			off = 0;
198			for (i = 0; i < cpu_kh->nmemsegs; i++) {
199			if (pa >= ramsegs[i].start &&
200			(pa - ramsegs[i].start) < ramsegs[i].size) {
201			off += (pa - ramsegs[i].start);
202			break;
203			}
204			off += ramsegs[i].size;
205			}
206
207			if (i == cpu_kh->nmemsegs)
208			_kvm_err(kd, 0, "pa %lx not in dump", pa);
209
210			return (kd->dump_off + off);
211			}