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/* $OpenBSD: kvm_alpha.c,v 1.17 2021/12/01 16:53:28 deraadt Exp $ */
/* $NetBSD: kvm_alpha.c,v 1.5 1996/10/01 21:12:05 cgd 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.
*/
#define __KVM_ALPHA_PRIVATE /* see <machine/pte.h> */
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <machine/kcore.h>
#include <unistd.h>
#include <stdlib.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <machine/vmparam.h>
#include <machine/pmap.h>
#include <limits.h>
#include <db.h>
#include "kvm_private.h"
struct vmstate {
vsize_t page_shift;
};
void
_kvm_freevtop(kvm_t *kd)
{
/* Not actually used for anything right now, but safe. */
free(kd->vmst);
kd->vmst = NULL;
}
int
_kvm_initvtop(kvm_t *kd)
{
cpu_kcore_hdr_t *cpu_kh;
struct vmstate *vm;
vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
if (vm == NULL)
return (-1);
cpu_kh = kd->cpu_data;
/* Compute page_shift. */
for (vm->page_shift = 0; (1L << vm->page_shift) < cpu_kh->page_size;
vm->page_shift++)
/* nothing */ ;
if ((1L << vm->page_shift) != cpu_kh->page_size) {
free(vm);
return (-1);
}
kd->vmst = vm;
return (0);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
cpu_kcore_hdr_t *cpu_kh;
struct vmstate *vm;
int rv, page_off;
alpha_pt_entry_t pte;
off_t pteoff;
if (!kd->vmst) {
_kvm_err(kd, 0, "vatop called before initvtop");
return (0);
}
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return (0);
}
cpu_kh = kd->cpu_data;
vm = kd->vmst;
page_off = va & (cpu_kh->page_size - 1);
#ifndef PAGE_SHIFT
#define PAGE_SHIFT vm->page_shift
#endif
if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) {
/*
* Direct-mapped address: just convert it.
*/
*pa = ALPHA_K0SEG_TO_PHYS(va);
rv = cpu_kh->page_size - page_off;
} else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) {
/*
* Real kernel virtual address: do the translation.
*/
/* Find and read the L1 PTE. */
pteoff = cpu_kh->lev1map_pa +
l1pte_index(va) * sizeof(alpha_pt_entry_t);
if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte),
(off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read L1 PTE");
goto lose;
}
/* Find and read the L2 PTE. */
if ((pte & ALPHA_PTE_VALID) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid L1 PTE)");
goto lose;
}
pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size +
l2pte_index(va) * sizeof(alpha_pt_entry_t);
if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte),
(off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read L2 PTE");
goto lose;
}
/* Find and read the L3 PTE. */
if ((pte & ALPHA_PTE_VALID) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid L2 PTE)");
goto lose;
}
pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size +
l3pte_index(va) * sizeof(alpha_pt_entry_t);
if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte),
(off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read L3 PTE");
goto lose;
}
/* Fill in the PA. */
if ((pte & ALPHA_PTE_VALID) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid L3 PTE)");
goto lose;
}
*pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off;
rv = cpu_kh->page_size - page_off;
} else {
/*
* Bogus address (not in KV space): punt.
*/
_kvm_err(kd, 0, "invalid kernel virtual address");
lose:
*pa = -1;
rv = 0;
}
return (rv);
}
/*
* 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);
}
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