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freebsd/lib/libkvm/kvm_arm.c
Andrew Turner 58c47a70a3 Allow libkvm to get the kernel va to pa delta without the need for
physaddr. This should allow for a kernel where PHYSADDR and KERNPHYSADDR
are both undefined.

For now libkvm will use the old method of reading physaddr and kernaddr
to allow it to work with old kernels. This could be removed in the future
when enough time has passed.

Differential Revision:	https://reviews.freebsd.org/D939
MFC after:	1 week
2014-10-19 20:23:31 +00:00

287 lines
7.5 KiB
C

/*-
* Copyright (c) 2005 Olivier Houchard
* Copyright (c) 1989, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software developed by the Computer Systems
* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
* BG 91-66 and contributed to Berkeley.
*
* 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.
* 4. Neither the name of the University nor the names of its contributors
* may 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>
#ifndef CROSS_LIBKVM
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <machine/pmap.h>
#else
#include "../../sys/arm/include/pte.h"
#include "../../sys/arm/include/vmparam.h"
#endif
#include <db.h>
#include <limits.h>
#include <kvm.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "kvm_private.h"
/* minidump must be the first item! */
struct vmstate {
int minidump; /* 1 = minidump mode */
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->minidump)
return (_kvm_minidump_freevtop(kd));
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;
struct nlist nl[2];
u_long kernbase, physaddr, pa;
pd_entry_t *l1pt;
Elf32_Ehdr *ehdr;
Elf32_Phdr *phdr;
size_t hdrsz;
char minihdr[8];
int found, i;
if (!kd->rawdump) {
if (pread(kd->pmfd, &minihdr, 8, 0) == 8) {
if (memcmp(&minihdr, "minidump", 8) == 0)
return (_kvm_minidump_initvtop(kd));
} else {
_kvm_err(kd, kd->program, "cannot read header");
return (-1);
}
}
vm = _kvm_malloc(kd, sizeof(*vm));
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);
phdr = (Elf32_Phdr *)((uint8_t *)ehdr + ehdr->e_phoff);
found = 0;
for (i = 0; i < ehdr->e_phnum; i++) {
if (phdr[i].p_type == PT_DUMP_DELTA) {
kernbase = phdr[i].p_vaddr;
physaddr = phdr[i].p_paddr;
found = 1;
break;
}
}
nl[1].n_name = NULL;
if (!found) {
nl[0].n_name = "kernbase";
if (kvm_nlist(kd, nl) != 0)
kernbase = KERNBASE;
else
kernbase = nl[0].n_value;
nl[0].n_name = "physaddr";
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "couldn't get phys addr");
return (-1);
}
physaddr = nl[0].n_value;
}
nl[0].n_name = "kernel_l1pa";
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if (kvm_read(kd, (nl[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)
{
struct vmstate *vm = kd->vmst;
pd_entry_t pd;
pt_entry_t pte;
off_t pte_pa;
if (kd->vmst->minidump)
return (_kvm_minidump_kvatop(kd, va, 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, &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 (%lx)", 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)
*/
#ifdef FBSD_NOT_YET
int
_kvm_mdopen(kvm_t *kd)
{
kd->usrstack = USRSTACK;
kd->min_uva = VM_MIN_ADDRESS;
kd->max_uva = VM_MAXUSER_ADDRESS;
return (0);
}
#endif