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/* $NetBSD: kvm_mips.c,v 1.22 2014/02/19 20:21:22 dsl Exp $ */
/*
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/*
* Modified for NetBSD/mips by Jason R. Thorpe, Numerical Aerospace
* Simulation Facility, NASA Ames Research Center.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: kvm_mips.c,v 1.22 2014/02/19 20:21:22 dsl Exp $");
#endif /* LIBC_SCCS and not lint */
/*
* MIPS 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 <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 <mips/cpuregs.h>
#include <mips/vmparam.h>
void
_kvm_freevtop(kvm_t *kd)
{
/* Not actually used for anything right now, but safe. */
if (kd->vmst != 0)
free(kd->vmst);
}
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;
int page_off;
u_int pte;
paddr_t pte_pa;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return((off_t)0);
}
cpu_kh = kd->cpu_data;
page_off = va & PGOFSET;
#ifdef _LP64
if (MIPS_XKPHYS_P(va)) {
/*
* Direct-mapped cached address: just convert it.
*/
*pa = MIPS_XKPHYS_TO_PHYS(va);
return (NBPG - page_off);
}
if (va < MIPS_XKPHYS_START) {
/*
* XUSEG (user virtual address space) - invalid.
*/
_kvm_err(kd, 0, "invalid kernel virtual address");
goto lose;
}
#else
if (va < MIPS_KSEG0_START) {
/*
* KUSEG (user virtual address space) - invalid.
*/
_kvm_err(kd, 0, "invalid kernel virtual address");
goto lose;
}
#endif
if (MIPS_KSEG0_P(va)) {
/*
* Direct-mapped cached address: just convert it.
*/
*pa = MIPS_KSEG0_TO_PHYS(va);
return (NBPG - page_off);
}
if (MIPS_KSEG1_P(va)) {
/*
* Direct-mapped uncached address: just convert it.
*/
*pa = MIPS_KSEG1_TO_PHYS(va);
return (NBPG - page_off);
}
#ifdef _LP64
if (va >= MIPS_KSEG2_START) {
/*
* KUSEG (user virtual address space) - invalid.
*/
_kvm_err(kd, 0, "invalid kernel virtual address");
goto lose;
}
#endif
/*
* We now know that we're a KSEG2 (kernel virtually mapped)
* address. Translate the address using the pmap's kernel
* page table.
*/
/*
* Step 1: Make sure the kernel page table has a translation
* for the address.
*/
#ifdef _LP64
if (va >= (MIPS_XKSEG_START + (cpu_kh->sysmapsize * NBPG))) {
_kvm_err(kd, 0, "invalid XKSEG address");
goto lose;
}
#else
if (va >= (MIPS_KSEG2_START + (cpu_kh->sysmapsize * NBPG))) {
_kvm_err(kd, 0, "invalid KSEG2 address");
goto lose;
}
#endif
/*
* Step 2: Locate and read the PTE.
*/
pte_pa = cpu_kh->sysmappa +
(((va - MIPS_KSEG2_START) >> PGSHIFT) * sizeof(u_int));
if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
_kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read PTE");
goto lose;
}
/*
* Step 3: Validate the PTE and return the physical address.
*/
if ((pte & cpu_kh->pg_v) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid PTE)");
goto lose;
}
*pa = (((pte & cpu_kh->pg_frame) >> cpu_kh->pg_shift) << PGSHIFT) +
page_off;
return (NBPG - page_off);
lose:
*pa = -1;
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 = (phys_ram_seg_t *)((char *)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);
}
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