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/* $OpenBSD: kvm_sh.c,v 1.7 2020/06/28 09:45:12 kettenis Exp $ */
/*
* Copyright (c) 2007 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice, this permission notice, and the disclaimer below
* appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/core.h>
#include <sys/kcore.h>
#include <sys/vnode.h>
#include <unistd.h>
#include <stdlib.h>
#include <nlist.h>
#include <kvm.h>
#include <db.h>
#include "kvm_private.h"
#include <machine/cpu.h>
#include <machine/kcore.h>
#include <machine/pte.h>
#include <machine/vmparam.h>
void
_kvm_freevtop(kvm_t *kd)
{
}
int
_kvm_initvtop(kvm_t *kd)
{
return (0);
}
/*
* Translate a kernel virtual address to a physical address by walking
* the kernel page tables.
*/
/* Stolen from sys/arch/sh/include/pmap.h we can't really include */
#define __PMAP_PTP_N 512 /* # of page table page maps 2GB. */
/* Stolen from sys/arch/sh/sh/pmap.c */
#define __PMAP_PTP_SHIFT 22
#define __PMAP_PTP_PG_N (kd->nbpg / sizeof(pt_entry_t))
#define __PMAP_PTP_INDEX(va) (((va) >> __PMAP_PTP_SHIFT) & (__PMAP_PTP_N - 1))
#define __PMAP_PTP_OFSET(va) ((va / kd->nbpg) & (__PMAP_PTP_PG_N - 1))
int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
cpu_kcore_hdr_t *h = kd->cpu_data;
u_int l1idx, l2idx;
vaddr_t l2va;
pt_entry_t l1pte, l2pte;
off_t pteoffset;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return (0);
}
/*
* P1 and P2 segments addresses are trivial.
*/
if (va >= SH3_P1SEG_BASE && va <= SH3_P1SEG_END) {
*pa = SH3_P1SEG_TO_PHYS(va);
return (int)((vaddr_t)SH3_P1SEG_END + 1 - va);
}
if (va >= SH3_P2SEG_BASE && va <= SH3_P2SEG_END) {
*pa = SH3_P2SEG_TO_PHYS(va);
return (int)((vaddr_t)SH3_P2SEG_END + 1 - va);
}
/*
* P3 segment addresses need kernel page table walk.
*/
if (va >= SH3_P3SEG_BASE && va < SH3_P3SEG_END) {
l1idx = __PMAP_PTP_INDEX(va - VM_MIN_KERNEL_ADDRESS);
l2idx = __PMAP_PTP_OFSET(va);
/* read level 1 pte */
pteoffset = h->kcore_kptp + sizeof(pt_entry_t) * l1idx;
if (_kvm_pread(kd, kd->pmfd, (char *)&l1pte, sizeof(l1pte),
_kvm_pa2off(kd, pteoffset)) != sizeof(l1pte)) {
_kvm_syserr(kd, 0, "could not read level 1 pte");
goto bad;
}
/* check pte for validity */
if ((l1pte & PG_V) == 0) {
_kvm_err(kd, 0, "invalid level 1 pte: no valid bit");
goto bad;
}
l2va = l1pte & PG_PPN;
if (l2va < SH3_P1SEG_BASE || l2va > SH3_P1SEG_END) {
_kvm_err(kd, 0, "invalid level 1 pte: out of P1");
goto bad;
}
/* read level 2 pte */
pteoffset = SH3_P1SEG_TO_PHYS(l2va) +
sizeof(pt_entry_t) * l2idx;
if (_kvm_pread(kd, kd->pmfd, (char *)&l2pte, sizeof(l2pte),
_kvm_pa2off(kd, pteoffset)) != sizeof(l2pte)) {
_kvm_syserr(kd, 0, "could not read level 2 pte");
goto bad;
}
/* check pte for validity */
if ((l2pte & PG_V) == 0) {
_kvm_err(kd, 0, "invalid level 2 pte: no valid bit");
goto bad;
}
*pa = (l2pte & PG_PPN) | (va & (kd->nbpg - 1));
return (kd->nbpg - (va & (kd->nbpg - 1)));
}
/*
* All other addresses are incorrect.
*/
_kvm_err(kd, 0, "not a kernel virtual address");
bad:
*pa = (paddr_t)-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 *h = kd->cpu_data;
phys_ram_seg_t *seg = h->kcore_segs;
off_t off = kd->dump_off;
u_int i;
for (i = h->kcore_nsegs; i != 0; i--) {
if (pa >= seg->start && pa < seg->start + seg->size)
return (off + (pa - seg->start));
off += seg->size;
}
_kvm_err(kd, 0, "physical address out of the image (%lx)", pa);
return (0);
}
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