NetBSD/lib/libkvm/kvm_mips.c
jym 962a341df6 Change kvm_pa2off() and kvm_kvatop() prototypes (private to kvm(3)):
-int     _kvm_kvatop(kvm_t *, u_long, u_long *);
-off_t   _kvm_pa2off(kvm_t *, u_long);
+int     _kvm_kvatop(kvm_t *, vaddr_t, paddr_t *);
+off_t   _kvm_pa2off(kvm_t *, paddr_t);

Basically, use vaddr_t for VA and paddr_t for PA. In addition, for variables
representing addresses, use paddr_t or vaddr_t, depending on the context.

For most arches, vaddr_t and paddr_t are equivalent to unsigned long. However,
the change was needed for exotic situations, like i386 PAE, were unsigned long
is not suitable for PA which are 64 bits long. As this required a complete
change of the function prototypes, all arches had to be adapted accordingly.

Core files from before this commit should still work with the new code; I did
not see any direct dependency between core's structure and kvatop/pa2off.

The change was compile tested for all arches, as it impacts all of them.

See also:

http://mail-index.netbsd.org/current-users/2010/09/07/msg014249.html
2010-09-20 23:23:16 +00:00

211 lines
4.6 KiB
C

/* $NetBSD: kvm_mips.c,v 1.20 2010/09/20 23:23:16 jym 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.
*/
/*
* Modified for NetBSD/mips by Jason R. Thorpe, Numerical Aerospace
* Simulation Facility, NASA Ames Research Center.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: kvm_mips.c,v 1.20 2010/09/20 23:23:16 jym Exp $");
#endif /* LIBC_SCCS and not lint */
/*
* MIPS machine dependent routines for kvm.
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/kcore.h>
#include <sys/types.h>
#include <machine/kcore.h>
#include <stdlib.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <limits.h>
#include <db.h>
#include "kvm_private.h"
#include <mips/cpuregs.h>
#include <mips/vmparam.h>
void
_kvm_freevtop(kvm_t *kd)
{
/* Not actually used for anything right now, but safe. */
if (kd->vmst != 0)
free(kd->vmst);
}
int
_kvm_initvtop(kvm_t *kd)
{
return (0);
}
/*
* Translate a kernel virtual address to a physical address.
*/
int
_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
{
cpu_kcore_hdr_t *cpu_kh;
int page_off;
u_int pte;
paddr_t pte_pa;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return((off_t)0);
}
cpu_kh = kd->cpu_data;
page_off = va & PGOFSET;
if (va < MIPS_KSEG0_START) {
/*
* KUSEG (user virtual address space) - invalid.
*/
_kvm_err(kd, 0, "invalid kernel virtual address");
goto lose;
}
if (va >= MIPS_KSEG0_START && va < MIPS_KSEG1_START) {
/*
* Direct-mapped cached address: just convert it.
*/
*pa = MIPS_KSEG0_TO_PHYS(va);
return (NBPG - page_off);
}
if (va >= MIPS_KSEG1_START && va < MIPS_KSEG2_START) {
/*
* Direct-mapped uncached address: just convert it.
*/
*pa = MIPS_KSEG1_TO_PHYS(va);
return (NBPG - page_off);
}
/*
* We now know that we're a KSEG2 (kernel virtually mapped)
* address. Translate the address using the pmap's kernel
* page table.
*/
/*
* Step 1: Make sure the kernel page table has a translation
* for the address.
*/
if (va >= (MIPS_KSEG2_START + (cpu_kh->sysmapsize * NBPG))) {
_kvm_err(kd, 0, "invalid KSEG2 address");
goto lose;
}
/*
* Step 2: Locate and read the PTE.
*/
pte_pa = cpu_kh->sysmappa +
(((va - MIPS_KSEG2_START) >> PGSHIFT) * sizeof(u_int));
if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
_kvm_pa2off(kd, pte_pa)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read PTE");
goto lose;
}
/*
* Step 3: Validate the PTE and return the physical address.
*/
if ((pte & cpu_kh->pg_v) == 0) {
_kvm_err(kd, 0, "invalid translation (invalid PTE)");
goto lose;
}
*pa = (((pte & cpu_kh->pg_frame) >> cpu_kh->pg_shift) << PGSHIFT) +
page_off;
return (NBPG - page_off);
lose:
*pa = -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 *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);
}
/*
* 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(kvm_t *kd)
{
kd->usrstack = USRSTACK;
kd->min_uva = VM_MIN_ADDRESS;
kd->max_uva = VM_MAXUSER_ADDRESS;
return (0);
}