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/* $NetBSD: kvm_powerpc.c,v 1.4 1998/02/03 06:50:07 mycroft 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.
*/
/*
* ARM machine dependent routines for kvm.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/elf32.h>
#include <sys/mman.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <machine/pmap.h>
#include <db.h>
#include <limits.h>
#include <kvm.h>
#include <stdlib.h>
#include "kvm_private.h"
struct vmstate {
pd_entry_t *l1pt;
void *mmapbase;
size_t mmapsize;
};
static int
_kvm_maphdrs(kvm_t *kd, size_t sz)
{
struct vmstate *vm = kd->vmst;
/* munmap() previous mmap(). */
if (vm->mmapbase != NULL) {
munmap(vm->mmapbase, vm->mmapsize);
vm->mmapbase = NULL;
}
vm->mmapsize = sz;
vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
if (vm->mmapbase == MAP_FAILED) {
_kvm_err(kd, kd->program, "cannot mmap corefile");
return (-1);
}
return (0);
}
/*
* Translate a physical memory address to a file-offset in the crash-dump.
*/
static size_t
_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
{
Elf32_Ehdr *e = kd->vmst->mmapbase;
Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff);
int n = e->e_phnum;
while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
p++, n--;
if (n == 0)
return (0);
*ofs = (pa - p->p_paddr) + p->p_offset;
if (pgsz == 0)
return (p->p_memsz - (pa - p->p_paddr));
return (pgsz - ((size_t)pa & (pgsz - 1)));
}
void
_kvm_freevtop(kvm_t *kd)
{
if (kd->vmst != 0) {
if (kd->vmst->mmapbase != NULL)
munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
free(kd->vmst);
kd->vmst = NULL;
}
}
int
_kvm_initvtop(kvm_t *kd)
{
struct vmstate *vm = _kvm_malloc(kd, sizeof(*vm));
struct nlist nlist[2];
u_long kernbase, physaddr, pa;
pd_entry_t *l1pt;
Elf32_Ehdr *ehdr;
size_t hdrsz;
if (vm == 0) {
_kvm_err(kd, kd->program, "cannot allocate vm");
return (-1);
}
kd->vmst = vm;
vm->l1pt = NULL;
if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1)
return (-1);
ehdr = kd->vmst->mmapbase;
hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
if (_kvm_maphdrs(kd, hdrsz) == -1)
return (-1);
nlist[0].n_name = "kernbase";
nlist[1].n_name = NULL;
if (kvm_nlist(kd, nlist) != 0)
kernbase = KERNBASE;
else
kernbase = nlist[0].n_value;
nlist[0].n_name = "physaddr";
if (kvm_nlist(kd, nlist) != 0) {
_kvm_err(kd, kd->program, "couldn't get phys addr");
return (-1);
}
physaddr = nlist[0].n_value;
nlist[0].n_name = "kernel_l1pa";
if (kvm_nlist(kd, nlist) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if (kvm_read(kd, (nlist[0].n_value - kernbase + physaddr), &pa,
sizeof(pa)) != sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read kernel_l1pa");
return (-1);
}
l1pt = _kvm_malloc(kd, L1_TABLE_SIZE);
if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) {
_kvm_err(kd, kd->program, "cannot read l1pt");
free(l1pt);
return (-1);
}
vm->l1pt = l1pt;
return 0;
}
/* from arm/pmap.c */
#define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT)
/* from arm/pmap.h */
#define L1_TYPE_INV 0x00 /* Invalid (fault) */
#define L1_TYPE_C 0x01 /* Coarse L2 */
#define L1_TYPE_S 0x02 /* Section */
#define L1_TYPE_F 0x03 /* Fine L2 */
#define L1_TYPE_MASK 0x03 /* mask of type bits */
#define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S)
#define l1pte_valid(pde) ((pde) != 0)
#define l2pte_valid(pte) ((pte) != 0)
#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT)
int
_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
{
u_long offset = va & (PAGE_SIZE - 1);
struct vmstate *vm = kd->vmst;
pd_entry_t pd;
pt_entry_t pte;
u_long pte_pa;
if (vm->l1pt == NULL)
return (_kvm_pa2off(kd, va, pa, PAGE_SIZE));
pd = vm->l1pt[L1_IDX(va)];
if (!l1pte_valid(pd))
goto invalid;
if (l1pte_section_p(pd)) {
/* 1MB section mapping. */
*pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET);
return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE));
}
pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
_kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE);
if (lseek(kd->pmfd, pte_pa, 0) == -1) {
_kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek");
goto invalid;
}
if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) {
_kvm_syserr(kd, kd->program, "_kvm_kvatop: read");
goto invalid;
}
if (!l2pte_valid(pte)) {
goto invalid;
}
if ((pte & L2_TYPE_MASK) == L2_TYPE_L) {
*pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE));
}
*pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET);
return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE));
invalid:
_kvm_err(kd, 0, "Invalid address (%x)", va);
return 0;
}
/*
* 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(kd)
kvm_t *kd;
{
#ifdef FBSD_NOT_YET
kd->usrstack = USRSTACK;
kd->min_uva = VM_MIN_ADDRESS;
kd->max_uva = VM_MAXUSER_ADDRESS;
#endif
return (0);
}
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