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freebsd/lib/libkvm/kvm_ia64.c
Marcel Moolenaar d69bc9bcbe Add support for PBVM addresses. In a nutshell this means: 
o   get the physical address and size of the PBVM page table. This
    can be found in the bootinfo structure, of which the physical
    address is recorded as the ELF entry point.
o   translate region 4 virtual addresses to physical addresses using
    the PBVM page table.

In _kvm_kvatop() make the distinction between physical address and
core file offset a little clearer to avoid confusion. To further
enhance readability, always store the translated address into pa
so that it's obvious how the translation from va to pa happened.

Approved by:	re (blanket)
2011-08-06 15:59:54 +00:00

293 lines
7.4 KiB
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/* $FreeBSD$ */
/* $NetBSD: kvm_alpha.c,v 1.7.2.1 1997/11/02 20:34:26 mellon 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.
*/
#include <sys/types.h>
#include <sys/elf64.h>
#include <sys/mman.h>
#include <machine/atomic.h>
#include <machine/bootinfo.h>
#include <machine/pte.h>
#include <kvm.h>
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include "kvm_private.h"
#define REGION_BASE(n) (((uint64_t)(n)) << 61)
#define REGION_ADDR(x) ((x) & ((1LL<<61)-1LL))
#define NKPTEPG(ps) ((ps) / sizeof(struct ia64_lpte))
#define NKPTEDIR(ps) ((ps) >> 3)
#define KPTE_PTE_INDEX(va,ps) (((va)/(ps)) % NKPTEPG(ps))
#define KPTE_DIR0_INDEX(va,ps) ((((va)/(ps)) / NKPTEPG(ps)) / NKPTEDIR(ps))
#define KPTE_DIR1_INDEX(va,ps) ((((va)/(ps)) / NKPTEPG(ps)) % NKPTEDIR(ps))
#define PBVM_BASE 0x9ffc000000000000UL
#define PBVM_PGSZ (64 * 1024)
struct vmstate {
void *mmapbase;
size_t mmapsize;
size_t pagesize;
u_long kptdir;
u_long *pbvm_pgtbl;
u_int pbvm_pgtblsz;
};
/*
* Map the ELF headers into the process' address space. We do this in two
* steps: first the ELF header itself and using that information the whole
* set of headers.
*/
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)
{
Elf64_Ehdr *e = kd->vmst->mmapbase;
Elf64_Phdr *p = (Elf64_Phdr*)((char*)e + e->e_phoff);
int n = e->e_phnum;
if (pa != REGION_ADDR(pa)) {
_kvm_err(kd, kd->program, "internal error");
return (0);
}
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)));
}
static ssize_t
_kvm_read_phys(kvm_t *kd, uint64_t pa, void *buf, size_t bufsz)
{
off_t ofs;
size_t sz;
sz = _kvm_pa2off(kd, pa, &ofs, 0);
if (sz < bufsz)
return ((ssize_t)sz);
if (lseek(kd->pmfd, ofs, 0) == -1)
return (-1);
return (read(kd->pmfd, buf, bufsz));
}
void
_kvm_freevtop(kvm_t *kd)
{
struct vmstate *vm = kd->vmst;
if (vm->pbvm_pgtbl != NULL)
free(vm->pbvm_pgtbl);
if (vm->mmapbase != NULL)
munmap(vm->mmapbase, vm->mmapsize);
free(vm);
kd->vmst = NULL;
}
int
_kvm_initvtop(kvm_t *kd)
{
struct bootinfo bi;
struct nlist nl[2];
uint64_t va;
Elf64_Ehdr *ehdr;
size_t hdrsz;
ssize_t sz;
kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
if (kd->vmst == NULL) {
_kvm_err(kd, kd->program, "cannot allocate vm");
return (-1);
}
kd->vmst->pagesize = getpagesize();
if (_kvm_maphdrs(kd, sizeof(Elf64_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);
/*
* Load the PBVM page table. We need this to resolve PBVM addresses.
* The PBVM page table is obtained from the bootinfo structure, of
* which the physical address is given to us in e_entry. If e_entry
* is 0, then this is assumed to be a pre-PBVM kernel.
*/
if (ehdr->e_entry != 0) {
sz = _kvm_read_phys(kd, ehdr->e_entry, &bi, sizeof(bi));
if (sz != sizeof(bi)) {
_kvm_err(kd, kd->program,
"cannot read bootinfo from PA %#lx", ehdr->e_entry);
return (-1);
}
if (bi.bi_magic != BOOTINFO_MAGIC) {
_kvm_err(kd, kd->program, "invalid bootinfo");
return (-1);
}
kd->vmst->pbvm_pgtbl = _kvm_malloc(kd, bi.bi_pbvm_pgtblsz);
if (kd->vmst->pbvm_pgtbl == NULL) {
_kvm_err(kd, kd->program, "cannot allocate page table");
return (-1);
}
kd->vmst->pbvm_pgtblsz = bi.bi_pbvm_pgtblsz;
sz = _kvm_read_phys(kd, bi.bi_pbvm_pgtbl, kd->vmst->pbvm_pgtbl,
bi.bi_pbvm_pgtblsz);
if (sz != bi.bi_pbvm_pgtblsz) {
_kvm_err(kd, kd->program,
"cannot read page table from PA %#lx",
bi.bi_pbvm_pgtbl);
return (-1);
}
} else {
kd->vmst->pbvm_pgtbl = NULL;
kd->vmst->pbvm_pgtblsz = 0;
}
/*
* At this point we've got enough information to use kvm_read() for
* direct mapped (ie region 6 and region 7) address, such as symbol
* addresses/values.
*/
nl[0].n_name = "ia64_kptdir";
nl[1].n_name = 0;
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
if (kvm_read(kd, (nl[0].n_value), &va, sizeof(va)) != sizeof(va)) {
_kvm_err(kd, kd->program, "cannot read kptdir");
return (-1);
}
if (va < REGION_BASE(6)) {
_kvm_err(kd, kd->program, "kptdir is itself virtual");
return (-1);
}
kd->vmst->kptdir = va;
return (0);
}
int
_kvm_kvatop(kvm_t *kd, u_long va, off_t *ofs)
{
struct ia64_lpte pte;
uint64_t pa, pgaddr, pt0addr, pt1addr;
size_t pgno, pgsz, pt0no, pt1no;
if (va >= REGION_BASE(6)) {
/* Regions 6 and 7: direct mapped. */
pa = REGION_ADDR(va);
return (_kvm_pa2off(kd, pa, ofs, 0));
} else if (va >= REGION_BASE(5)) {
/* Region 5: Kernel Virtual Memory. */
va = REGION_ADDR(va);
pgsz = kd->vmst->pagesize;
pt0no = KPTE_DIR0_INDEX(va, pgsz);
pt1no = KPTE_DIR1_INDEX(va, pgsz);
pgno = KPTE_PTE_INDEX(va, pgsz);
if (pt0no >= NKPTEDIR(pgsz))
goto fail;
pt0addr = kd->vmst->kptdir + (pt0no << 3);
if (kvm_read(kd, pt0addr, &pt1addr, 8) != 8)
goto fail;
if (pt1addr == 0)
goto fail;
pt1addr += pt1no << 3;
if (kvm_read(kd, pt1addr, &pgaddr, 8) != 8)
goto fail;
if (pgaddr == 0)
goto fail;
pgaddr += pgno * sizeof(pte);
if (kvm_read(kd, pgaddr, &pte, sizeof(pte)) != sizeof(pte))
goto fail;
if (!(pte.pte & PTE_PRESENT))
goto fail;
pa = (pte.pte & PTE_PPN_MASK) + (va & (pgsz - 1));
return (_kvm_pa2off(kd, pa, ofs, pgsz));
} else if (va >= PBVM_BASE) {
/* Region 4: Pre-Boot Virtual Memory (PBVM). */
va -= PBVM_BASE;
pgsz = PBVM_PGSZ;
pt0no = va / pgsz;
if (pt0no >= (kd->vmst->pbvm_pgtblsz >> 3))
goto fail;
pt0addr = kd->vmst->pbvm_pgtbl[pt0no];
if (!(pt0addr & PTE_PRESENT))
goto fail;
pa = (pt0addr & PTE_PPN_MASK) + va % pgsz;
return (_kvm_pa2off(kd, pa, ofs, pgsz));
}
fail:
_kvm_err(kd, kd->program, "invalid kernel virtual address");
*ofs = ~0UL;
return (0);
}
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