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Revision 1.6, Mon Sep 20 23:23:16 2010 UTC (10 years ago) by jym
Branch: MAIN
CVS Tags: yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, 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-9, 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, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-mips64-premerge-20101231, localcount-20160914, is-mlppp-base, is-mlppp, cherry-xenmp-base, cherry-xenmp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, HEAD
Changes since 1.5: +6 -4 lines

Change kvm_pa2off() and kvm_kvatop() prototypes (private to kvm(3)):

-int     _kvm_kvatop(kvm_t *, u_long, u_long *);
-off_t   _kvm_pa2off(kvm_t *, u_long);
+int     _kvm_kvatop(kvm_t *, vaddr_t, paddr_t *);
+off_t   _kvm_pa2off(kvm_t *, paddr_t);

Basically, use vaddr_t for VA and paddr_t for PA. In addition, for variables
representing addresses, use paddr_t or vaddr_t, depending on the context.

For most arches, vaddr_t and paddr_t are equivalent to unsigned long. However,
the change was needed for exotic situations, like i386 PAE, were unsigned long
is not suitable for PA which are 64 bits long. As this required a complete
change of the function prototypes, all arches had to be adapted accordingly.

Core files from before this commit should still work with the new code; I did
not see any direct dependency between core's structure and kvatop/pa2off.

The change was compile tested for all arches, as it impacts all of them.

See also:

http://mail-index.netbsd.org/current-users/2010/09/07/msg014249.html

/* $NetBSD: kvm_arm.c,v 1.6 2010/09/20 23:23:16 jym Exp $	 */

/*-
 * Copyright (C) 1996 Wolfgang Solfrank.
 * Copyright (C) 1996 TooLs GmbH.
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 *
 *	from: kvm_powerpc.c,v 1.3 1997/09/19 04:00:23 thorpej Exp
 */

/*
 * arm32 machine dependent routines for kvm.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: kvm_arm.c,v 1.6 2010/09/20 23:23:16 jym Exp $");
#endif				/* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <sys/exec.h>
#include <sys/kcore.h>
#include <sys/types.h>

#include <arm/kcore.h>
#include <arm/arm32/pte.h>

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

#include <unistd.h>

#include "kvm_private.h"

void
_kvm_freevtop(kvm_t * kd)
{
	if (kd->vmst != 0)
		free(kd->vmst);
}

int
_kvm_initvtop(kvm_t * kd)
{
	return 0;
}

int
_kvm_kvatop(kvm_t * kd, vaddr_t va, paddr_t *pa)
{
	cpu_kcore_hdr_t *cpu_kh;
	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;

	if (cpu_kh->version != 1) {
		_kvm_err(kd, 0, "unsupported kcore structure version");
		return 0;
	}
	if (cpu_kh->flags != 0) {
		_kvm_err(kd, 0, "kcore flags not supported");
		return 0;
	}
	/*
	 * work out which L1 table we need
	 */
	if (va >= (cpu_kh->UserL1TableSize << 17))
		pde_pa = cpu_kh->PAKernelL1Table;
	else
		pde_pa = cpu_kh->PAUserL1Table;

	/*
	 * work out the offset into the L1 Table
	 */
	pde_pa += ((va >> 20) * sizeof(pd_entry_t));

	if (_kvm_pread(kd, kd->pmfd, (void *) &pde, sizeof(pd_entry_t),
		  _kvm_pa2off(kd, pde_pa)) != sizeof(pd_entry_t)) {
		_kvm_syserr(kd, 0, "could not read L1 entry");
		return (0);
	}
	/*
	 * next work out what kind of record it is
	 */
	switch (pde & L1_TYPE_MASK) {
	case L1_TYPE_S:
		*pa = (pde & L1_S_FRAME) | (va & L1_S_OFFSET);
		return L1_S_SIZE - (va & L1_S_OFFSET);
	case L1_TYPE_C:
		pte_pa = (pde & L1_C_ADDR_MASK)
			| ((va & 0xff000) >> 10);
		break;
	case L1_TYPE_F:
		pte_pa = (pde & L1_S_ADDR_MASK)
			| ((va & 0xffc00) >> 8);
		break;
	default:
		_kvm_syserr(kd, 0, "L1 entry is invalid");
		return (0);
	}

	/*
	 * locate the pte and load it
	 */
	if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pt_entry_t),
		  _kvm_pa2off(kd, pte_pa)) != sizeof(pt_entry_t)) {
		_kvm_syserr(kd, 0, "could not read L2 entry");
		return (0);
	}
	switch (pte & L2_TYPE_MASK) {
	case L2_TYPE_L:
		*pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
		return (L2_L_SIZE - (va & L2_L_OFFSET));
	case L2_TYPE_S:
		*pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET);
		return (L2_S_SIZE - (va & L2_S_OFFSET));
	case L2_TYPE_T:
		*pa = (pte & L2_T_FRAME) | (va & L2_T_OFFSET);
		return (L2_T_SIZE - (va & L2_T_OFFSET));
	default:
		_kvm_syserr(kd, 0, "L2 entry is invalid");
		return (0);
	}

	_kvm_err(kd, 0, "vatop not yet implemented!");
	return 0;
}

off_t
_kvm_pa2off(kvm_t * kd, u_long 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 + cpu_kh->omemsegs);

	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. arm)
 */
int
_kvm_mdopen(kvm_t * kd)
{
	uintptr_t       max_uva;
	extern struct ps_strings *__ps_strings;

#if 0				/* XXX - These vary across arm machines... */
	kd->usrstack = USRSTACK;
	kd->min_uva = VM_MIN_ADDRESS;
	kd->max_uva = VM_MAXUSER_ADDRESS;
#endif
	/* This is somewhat hack-ish, but it works. */
	max_uva = (uintptr_t) (__ps_strings + 1);
	kd->usrstack = max_uva;
	kd->max_uva = max_uva;
	kd->min_uva = 0;

	return (0);
}