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 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #if defined(LIBC_SCCS) && !defined(lint)
39 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
41 #endif /* LIBC_SCCS and not lint */
44 * i386 machine dependent routines for kvm. Hopefully, the forthcoming
45 * vm code will one day obsolete this module.
48 #include <sys/param.h>
60 #include <vm/vm_param.h>
62 #include <machine/elf.h>
66 #include "kvm_private.h"
69 #define btop(x) (i386_btop(x))
70 #define ptob(x) (i386_ptob(x))
73 #define PG_FRAME_PAE (~((uint64_t)PAGE_MASK))
74 #define PDRSHIFT_PAE 21
75 #define NPTEPG_PAE (PAGE_SIZE/sizeof(uint64_t))
76 #define NBPDR_PAE (1<<PDRSHIFT_PAE)
78 /* minidump must be the first item! */
80 int minidump; /* 1 = minidump mode */
88 * Map the ELF headers into the process' address space. We do this in two
89 * steps: first the ELF header itself and using that information the whole
93 _kvm_maphdrs(kvm_t *kd, size_t sz)
95 struct vmstate *vm = kd->vmst;
97 /* munmap() previous mmap(). */
98 if (vm->mmapbase != NULL) {
99 munmap(vm->mmapbase, vm->mmapsize);
104 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
105 if (vm->mmapbase == MAP_FAILED) {
106 _kvm_err(kd, kd->program, "cannot mmap corefile");
113 * Translate a physical memory address to a file-offset in the crash-dump.
116 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
118 Elf_Ehdr *e = kd->vmst->mmapbase;
124 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
127 p = (Elf_Phdr*)((char*)e + e->e_phoff);
129 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
133 *ofs = (pa - p->p_paddr) + p->p_offset;
134 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
138 _kvm_freevtop(kvm_t *kd)
140 struct vmstate *vm = kd->vmst;
142 if (kd->vmst->minidump)
143 return (_kvm_minidump_freevtop(kd));
144 if (vm->mmapbase != NULL)
145 munmap(vm->mmapbase, vm->mmapsize);
153 _kvm_initvtop(kvm_t *kd)
164 if (!kd->rawdump && pread(kd->pmfd, &minihdr, 8, 0) == 8)
165 if (memcmp(&minihdr, "minidump", 8) == 0)
166 return (_kvm_minidump_initvtop(kd));
168 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
170 _kvm_err(kd, kd->program, "cannot allocate vm");
175 if (kd->rawdump == 0) {
176 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
179 ehdr = kd->vmst->mmapbase;
180 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
181 if (_kvm_maphdrs(kd, hdrsz) == -1)
185 nl[0].n_name = "kernbase";
188 if (kvm_nlist(kd, nl) != 0)
189 kernbase = KERNBASE; /* for old kernels */
191 kernbase = nl[0].n_value;
193 nl[0].n_name = "IdlePDPT";
196 if (kvm_nlist(kd, nl) == 0) {
199 if (kvm_read(kd, (nl[0].n_value - kernbase), &pa,
200 sizeof(pa)) != sizeof(pa)) {
201 _kvm_err(kd, kd->program, "cannot read IdlePDPT");
204 PTD = _kvm_malloc(kd, 4 * PAGE_SIZE);
205 for (i = 0; i < 4; i++) {
206 if (kvm_read(kd, pa + (i * sizeof(pa64)), &pa64,
207 sizeof(pa64)) != sizeof(pa64)) {
208 _kvm_err(kd, kd->program, "Cannot read PDPT");
212 if (kvm_read(kd, pa64 & PG_FRAME_PAE,
213 PTD + (i * PAGE_SIZE), PAGE_SIZE) != (PAGE_SIZE)) {
214 _kvm_err(kd, kd->program, "cannot read PDPT");
222 nl[0].n_name = "IdlePTD";
225 if (kvm_nlist(kd, nl) != 0) {
226 _kvm_err(kd, kd->program, "bad namelist");
229 if (kvm_read(kd, (nl[0].n_value - kernbase), &pa,
230 sizeof(pa)) != sizeof(pa)) {
231 _kvm_err(kd, kd->program, "cannot read IdlePTD");
234 PTD = _kvm_malloc(kd, PAGE_SIZE);
235 if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) {
236 _kvm_err(kd, kd->program, "cannot read PTD");
246 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
262 PTD = (uint32_t *)vm->PTD;
263 offset = va & (PAGE_SIZE - 1);
266 * If we are initializing (kernel page table descriptor pointer
267 * not yet set) then return pa == va to avoid infinite recursion.
270 s = _kvm_pa2off(kd, va, pa);
272 _kvm_err(kd, kd->program,
273 "_kvm_vatop: bootstrap data not in dump");
276 return (PAGE_SIZE - offset);
279 pdeindex = va >> PDRSHIFT;
281 if (((u_long)pde & PG_V) == 0) {
282 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
286 if ((u_long)pde & PG_PS) {
288 * No second-level page table; ptd describes one 4MB page.
289 * (We assume that the kernel wouldn't set PG_PS without enabling
292 #define PAGE4M_MASK (NBPDR - 1)
293 #define PG_FRAME4M (~PAGE4M_MASK)
294 pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
295 s = _kvm_pa2off(kd, pde_pa, &ofs);
297 _kvm_err(kd, kd->program,
298 "_kvm_vatop: 4MB page address not in dump");
302 return (NBPDR - (va & PAGE4M_MASK));
305 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
306 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde));
308 s = _kvm_pa2off(kd, pte_pa, &ofs);
309 if (s < sizeof pte) {
310 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
314 /* XXX This has to be a physical address read, kvm_read is virtual */
315 if (lseek(kd->pmfd, ofs, 0) == -1) {
316 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
319 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
320 _kvm_syserr(kd, kd->program, "_kvm_vatop: read");
323 if (((u_long)pte & PG_V) == 0) {
324 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
328 a = ((u_long)pte & PG_FRAME) + offset;
329 s =_kvm_pa2off(kd, a, pa);
331 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump");
334 return (PAGE_SIZE - offset);
337 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
342 _kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
358 PTD = (uint64_t *)vm->PTD;
359 offset = va & (PAGE_SIZE - 1);
362 * If we are initializing (kernel page table descriptor pointer
363 * not yet set) then return pa == va to avoid infinite recursion.
366 s = _kvm_pa2off(kd, va, pa);
368 _kvm_err(kd, kd->program,
369 "_kvm_vatop_pae: bootstrap data not in dump");
372 return (PAGE_SIZE - offset);
375 pdeindex = va >> PDRSHIFT_PAE;
377 if (((u_long)pde & PG_V) == 0) {
378 _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid");
382 if ((u_long)pde & PG_PS) {
384 * No second-level page table; ptd describes one 2MB page.
385 * (We assume that the kernel wouldn't set PG_PS without enabling
388 #define PAGE2M_MASK (NBPDR_PAE - 1)
389 #define PG_FRAME2M (~PAGE2M_MASK)
390 pde_pa = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK);
391 s = _kvm_pa2off(kd, pde_pa, &ofs);
393 _kvm_err(kd, kd->program,
394 "_kvm_vatop: 2MB page address not in dump");
398 return (NBPDR_PAE - (va & PAGE2M_MASK));
401 pteindex = (va >> PAGE_SHIFT) & (NPTEPG_PAE-1);
402 pte_pa = ((uint64_t)pde & PG_FRAME_PAE) + (pteindex * sizeof(pde));
404 s = _kvm_pa2off(kd, pte_pa, &ofs);
405 if (s < sizeof pte) {
406 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pdpe_pa not found");
410 /* XXX This has to be a physical address read, kvm_read is virtual */
411 if (lseek(kd->pmfd, ofs, 0) == -1) {
412 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: lseek");
415 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
416 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: read");
419 if (((uint64_t)pte & PG_V) == 0) {
420 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pte not valid");
424 a = ((uint64_t)pte & PG_FRAME_PAE) + offset;
425 s =_kvm_pa2off(kd, a, pa);
427 _kvm_err(kd, kd->program,
428 "_kvm_vatop_pae: address not in dump");
431 return (PAGE_SIZE - offset);
434 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
439 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
442 if (kd->vmst->minidump)
443 return (_kvm_minidump_kvatop(kd, va, pa));
445 _kvm_err(kd, 0, "vatop called in live kernel!");
449 return (_kvm_vatop_pae(kd, va, pa));
451 return (_kvm_vatop(kd, va, pa));