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File: [cvs.NetBSD.org] / src / lib / libkvm / kvm_x86_64.c (download)

Revision 1.10, Wed Feb 19 20:21:22 2014 UTC (6 years, 7 months ago) by dsl
Branch: MAIN
CVS Tags: yamt-pagecache-base9, tls-maxphys-base, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20191119, phil-wifi-20190609, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, is-mlppp-base, is-mlppp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan
Branch point for: phil-wifi, netbsd-9
Changes since 1.9: +2 -3 lines

Remove the #include <sys/user.h> from all of libkvm.
sys/user.h is a stub that just #includes sys/pcb.h.
There are no 'struct pcb' anywhere in here, so I'm extremely doubtful
any of the builds will fail.
OTOH it might be relying on a header that pcb.h includes.
In any case i386 and amd64 build.

/*	$NetBSD: kvm_x86_64.c,v 1.10 2014/02/19 20:21:22 dsl 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)kvm_hp300.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: kvm_x86_64.c,v 1.10 2014/02/19 20:21:22 dsl Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

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

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <sys/types.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/kcore.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. */
	if (kd->vmst != 0)
		free(kd->vmst);
}

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

	return (0);
}

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

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

	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 (_kvm_pread(kd, 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 (_kvm_pread(kd, 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;
	}
	if (pde & PG_PS) {
		page_off = va & (NBPD_L3 - 1);
		*pa = (pde & PG_1GFRAME) + page_off;
		return (int)(NBPD_L3 - page_off);
	}

	/*
	 * Level 2.
	 */
	pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t));
	if (_kvm_pread(kd, 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;
	}
	if (pde & PG_PS) {
		page_off = va & (NBPD_L2 - 1);
		*pa = (pde & PG_2MFRAME) + page_off;
		return (int)(NBPD_L2 - page_off);
	}

	/*
	 * Level 1.
	 */
	pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t));
	if (_kvm_pread(kd, 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;
	}
	page_off = va & PGOFSET;
	*pa = (pte & PG_FRAME) + page_off;
	return (int)(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;
	}

	return (kd->dump_off + off);
}

/*
 * Machine-dependent initialization for ALL open kvm descriptors,
 * not just those for a kernel crash dump.  Some architectures
 * have to deal with these NOT being constants!  (i.e. m68k)
 */
int
_kvm_mdopen(kvm_t *kd)
{

	kd->usrstack = USRSTACK;
	kd->min_uva = VM_MIN_ADDRESS;
	kd->max_uva = VM_MAXUSER_ADDRESS;

	return (0);
}