2 * Copyright (c) 1989, 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software developed by the Computer Systems
6 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
7 * BG 91-66 and contributed to Berkeley.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #if defined(LIBC_SCCS) && !defined(lint)
43 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
45 #endif /* LIBC_SCCS and not lint */
48 * i386 machine dependent routines for kvm. Hopefully, the forthcoming
49 * vm code will one day obsolete this module.
52 #include <sys/param.h>
63 #include <vm/vm_param.h>
65 #include <machine/elf.h>
69 #include "kvm_private.h"
72 #define btop(x) (i386_btop(x))
73 #define ptob(x) (i386_ptob(x))
76 #define PG_FRAME_PAE (~((uint64_t)PAGE_MASK))
77 #define PDRSHIFT_PAE 21
78 #define NPTEPG_PAE (PAGE_SIZE/sizeof(uint64_t))
79 #define NBPDR_PAE (1<<PDRSHIFT_PAE)
81 /* minidump must be the first item! */
83 int minidump; /* 1 = minidump mode */
91 * Map the ELF headers into the process' address space. We do this in two
92 * steps: first the ELF header itself and using that information the whole
93 * set of headers. (Taken from kvm_ia64.c)
96 _kvm_maphdrs(kvm_t *kd, size_t sz)
98 struct vmstate *vm = kd->vmst;
100 /* munmap() previous mmap(). */
101 if (vm->mmapbase != NULL) {
102 munmap(vm->mmapbase, vm->mmapsize);
107 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
108 if (vm->mmapbase == MAP_FAILED) {
109 _kvm_err(kd, kd->program, "cannot mmap corefile");
116 * Translate a physical memory address to a file-offset in the crash-dump.
117 * (Taken from kvm_ia64.c)
120 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
122 Elf_Ehdr *e = kd->vmst->mmapbase;
123 Elf_Phdr *p = (Elf_Phdr*)((char*)e + e->e_phoff);
126 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
130 *ofs = (pa - p->p_paddr) + p->p_offset;
131 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
135 _kvm_freevtop(kvm_t *kd)
137 struct vmstate *vm = kd->vmst;
139 if (kd->vmst->minidump)
140 return (_kvm_minidump_freevtop(kd));
141 if (vm->mmapbase != NULL)
142 munmap(vm->mmapbase, vm->mmapsize);
150 _kvm_initvtop(kvm_t *kd)
152 struct nlist nlist[2];
161 if (pread(kd->pmfd, &minihdr, 8, 0) == 8)
162 if (memcmp(&minihdr, "minidump", 8) == 0)
163 return (_kvm_minidump_initvtop(kd));
165 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
167 _kvm_err(kd, kd->program, "cannot allocate vm");
172 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
175 ehdr = kd->vmst->mmapbase;
176 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
177 if (_kvm_maphdrs(kd, hdrsz) == -1)
180 nlist[0].n_name = "kernbase";
183 if (kvm_nlist(kd, nlist) != 0)
184 kernbase = KERNBASE; /* for old kernels */
186 kernbase = nlist[0].n_value;
188 nlist[0].n_name = "IdlePDPT";
191 if (kvm_nlist(kd, nlist) == 0) {
194 if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa,
195 sizeof(pa)) != sizeof(pa)) {
196 _kvm_err(kd, kd->program, "cannot read IdlePDPT");
199 PTD = _kvm_malloc(kd, 4 * PAGE_SIZE);
200 for (i = 0; i < 4; i++) {
201 if (kvm_read(kd, pa + (i * sizeof(pa64)), &pa64,
202 sizeof(pa64)) != sizeof(pa64)) {
203 _kvm_err(kd, kd->program, "Cannot read PDPT");
207 if (kvm_read(kd, pa64 & PG_FRAME_PAE,
208 PTD + (i * PAGE_SIZE), PAGE_SIZE) != (PAGE_SIZE)) {
209 _kvm_err(kd, kd->program, "cannot read PDPT");
217 nlist[0].n_name = "IdlePTD";
220 if (kvm_nlist(kd, nlist) != 0) {
221 _kvm_err(kd, kd->program, "bad namelist");
224 if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa,
225 sizeof(pa)) != sizeof(pa)) {
226 _kvm_err(kd, kd->program, "cannot read IdlePTD");
229 PTD = _kvm_malloc(kd, PAGE_SIZE);
230 if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) {
231 _kvm_err(kd, kd->program, "cannot read PTD");
242 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
258 PTD = (uint32_t *)vm->PTD;
259 offset = va & (PAGE_SIZE - 1);
262 * If we are initializing (kernel page table descriptor pointer
263 * not yet set) then return pa == va to avoid infinite recursion.
266 s = _kvm_pa2off(kd, va, pa);
268 _kvm_err(kd, kd->program,
269 "_kvm_vatop: bootstrap data not in dump");
272 return (PAGE_SIZE - offset);
275 pdeindex = va >> PDRSHIFT;
277 if (((u_long)pde & PG_V) == 0) {
278 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
282 if ((u_long)pde & PG_PS) {
284 * No second-level page table; ptd describes one 4MB page.
285 * (We assume that the kernel wouldn't set PG_PS without enabling
288 #define PAGE4M_MASK (NBPDR - 1)
289 #define PG_FRAME4M (~PAGE4M_MASK)
290 pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
291 s = _kvm_pa2off(kd, pde_pa, &ofs);
292 if (s < sizeof pde) {
293 _kvm_syserr(kd, kd->program,
294 "_kvm_vatop: pde_pa not found");
298 return (NBPDR - (va & PAGE4M_MASK));
301 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
302 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde));
304 s = _kvm_pa2off(kd, pte_pa, &ofs);
305 if (s < sizeof pte) {
306 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
310 /* XXX This has to be a physical address read, kvm_read is virtual */
311 if (lseek(kd->pmfd, ofs, 0) == -1) {
312 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
315 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
316 _kvm_syserr(kd, kd->program, "_kvm_vatop: read");
319 if (((u_long)pte & PG_V) == 0) {
320 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
324 a = ((u_long)pte & PG_FRAME) + offset;
325 s =_kvm_pa2off(kd, a, pa);
327 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump");
330 return (PAGE_SIZE - offset);
333 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
338 _kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
354 PTD = (uint64_t *)vm->PTD;
355 offset = va & (PAGE_SIZE - 1);
358 * If we are initializing (kernel page table descriptor pointer
359 * not yet set) then return pa == va to avoid infinite recursion.
362 s = _kvm_pa2off(kd, va, pa);
364 _kvm_err(kd, kd->program,
365 "_kvm_vatop_pae: bootstrap data not in dump");
368 return (PAGE_SIZE - offset);
371 pdeindex = va >> PDRSHIFT_PAE;
373 if (((u_long)pde & PG_V) == 0) {
374 _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid");
378 if ((u_long)pde & PG_PS) {
380 * No second-level page table; ptd describes one 2MB page.
381 * (We assume that the kernel wouldn't set PG_PS without enabling
384 #define PAGE2M_MASK (NBPDR_PAE - 1)
385 #define PG_FRAME2M (~PAGE2M_MASK)
386 pde_pa = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK);
387 s = _kvm_pa2off(kd, pde_pa, &ofs);
388 if (s < sizeof pde) {
389 _kvm_syserr(kd, kd->program,
390 "_kvm_vatop_pae: pde_pa not found");
394 return (NBPDR_PAE - (va & PAGE2M_MASK));
397 pteindex = (va >> PAGE_SHIFT) & (NPTEPG_PAE-1);
398 pte_pa = ((uint64_t)pde & PG_FRAME_PAE) + (pteindex * sizeof(pde));
400 s = _kvm_pa2off(kd, pte_pa, &ofs);
401 if (s < sizeof pte) {
402 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pdpe_pa not found");
406 /* XXX This has to be a physical address read, kvm_read is virtual */
407 if (lseek(kd->pmfd, ofs, 0) == -1) {
408 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: lseek");
411 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
412 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: read");
415 if (((uint64_t)pte & PG_V) == 0) {
416 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pte not valid");
420 a = ((uint64_t)pte & PG_FRAME_PAE) + offset;
421 s =_kvm_pa2off(kd, a, pa);
423 _kvm_err(kd, kd->program,
424 "_kvm_vatop_pae: address not in dump");
427 return (PAGE_SIZE - offset);
430 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
435 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
438 if (kd->vmst->minidump)
439 return (_kvm_minidump_kvatop(kd, va, pa));
441 _kvm_err(kd, 0, "vatop called in live kernel!");
445 return (_kvm_vatop_pae(kd, va, pa));
447 return (_kvm_vatop(kd, va, pa));