/* $NetBSD: kvm_arm.c,v 1.7 2022/01/10 19:51:30 christos 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 1.7 2022/01/10 19:51:30 christos 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->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->max_uva = max_uva;
kd->min_uva = 0;
return (0);
}
