2 * Copyright (c) 1989, 1992, 1993
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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.
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37 * @(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93
38 * $FreeBSD: src/lib/libkvm/kvm_amd64.c,v 1.16 2003/04/30 21:05:33 peter Exp $
42 * x86_64 machine dependent routines for kvm. Hopefully, the forthcoming
43 * vm code will one day obsolete this module.
46 #include <sys/user.h> /* MUST BE FIRST */
47 #include <sys/param.h>
51 #include <sys/elf_common.h>
59 #include <vm/vm_param.h>
61 #include <machine/elf.h>
65 #include "kvm_private.h"
68 #define btop(x) (x86_64_btop(x))
69 #define ptob(x) (x86_64_ptob(x))
73 int minidump; /* 1 = minidump mode */
80 * Map the ELF headers into the process' address space. We do this in two
81 * steps: first the ELF header itself and using that information the whole
82 * set of headers. (Taken from kvm_ia64.c)
85 _kvm_maphdrs(kvm_t *kd, size_t sz)
87 struct vmstate *vm = kd->vmst;
89 if (kd->vmst->minidump) {
90 _kvm_minidump_freevtop(kd);
94 /* munmap() previous mmap(). */
95 if (vm->mmapbase != NULL) {
96 munmap(vm->mmapbase, vm->mmapsize);
101 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
102 if (vm->mmapbase == MAP_FAILED) {
103 _kvm_err(kd, kd->program, "cannot mmap corefile");
110 * Translate a physical memory address to a file-offset in the crash-dump.
111 * (Taken from kvm_ia64.c)
114 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
116 Elf_Ehdr *e = kd->vmst->mmapbase;
122 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
125 p = (Elf_Phdr*)((char*)e + e->e_phoff);
128 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
132 *ofs = (pa - p->p_paddr) + p->p_offset;
133 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
137 _kvm_freevtop(kvm_t *kd)
139 struct vmstate *vm = kd->vmst;
141 if (kd->vmst->minidump) {
142 _kvm_minidump_freevtop(kd);
146 if (vm->mmapbase != NULL)
147 munmap(vm->mmapbase, vm->mmapsize);
155 _kvm_initvtop(kvm_t *kd)
157 struct nlist nlist[2];
166 if (pread(kd->pmfd, &minihdr, 8, 0) == 8)
167 if (memcmp(&minihdr, "minidump", 8) == 0)
168 return (_kvm_minidump_initvtop(kd));
170 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
172 _kvm_err(kd, kd->program, "cannot allocate vm");
177 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
180 * Check if this is indeed an ELF header. If not, assume old style
181 *dump or memory layout.
183 ehdr = kd->vmst->mmapbase;
184 if (!IS_ELF(*ehdr)) {
186 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
187 kd->vmst->mmapbase = NULL;
189 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
190 if (_kvm_maphdrs(kd, hdrsz) == -1)
194 nlist[0].n_name = "kernbase";
197 if (kvm_nlist(kd, nlist) != 0) {
198 _kvm_err(kd, kd->program, "bad namelist - no kernbase");
201 kernbase = nlist[0].n_value;
203 nlist[0].n_name = "dumppcb";
206 if (kvm_nlist(kd, nlist) != 0) {
207 _kvm_err(kd, kd->program, "bad namelist - no dumppcb");
210 if (kvm_read(kd, (nlist[0].n_value - kernbase), &dumppcb,
211 sizeof(dumppcb)) != sizeof(dumppcb)) {
212 _kvm_err(kd, kd->program, "cannot read dumppcb");
215 pa = dumppcb.pcb_cr3 & PG_FRAME;
217 PML4 = _kvm_malloc(kd, PAGE_SIZE);
218 if (kvm_read(kd, pa, PML4, PAGE_SIZE) != PAGE_SIZE) {
219 _kvm_err(kd, kd->program, "cannot read dumppcb");
222 kd->vmst->PML4 = PML4;
227 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
247 offset = va & (PAGE_SIZE - 1);
250 * If we are initializing (kernel page table descriptor pointer
251 * not yet set) then return pa == va to avoid infinite recursion.
253 if (vm->PML4 == NULL) {
254 s = _kvm_pa2off(kd, va, pa);
256 _kvm_err(kd, kd->program,
257 "_kvm_vatop: bootstrap data not in dump");
260 return (PAGE_SIZE - offset);
263 pml4eindex = (va >> PML4SHIFT) & (NPML4EPG - 1);
264 pml4e = vm->PML4[pml4eindex];
265 if (((u_long)pml4e & PG_V) == 0) {
266 _kvm_err(kd, kd->program, "_kvm_vatop: pml4e not valid");
270 pdpeindex = (va >> PDPSHIFT) & (NPDPEPG-1);
271 pdpe_pa = ((u_long)pml4e & PG_FRAME) +
272 (pdpeindex * sizeof(pdp_entry_t));
274 s = _kvm_pa2off(kd, pdpe_pa, &ofs);
275 if (s < sizeof pdpe) {
276 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
279 if (lseek(kd->pmfd, ofs, 0) == -1) {
280 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek pdpe_pa");
283 if (read(kd->pmfd, &pdpe, sizeof pdpe) != sizeof pdpe) {
284 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pdpe");
287 if (((u_long)pdpe & PG_V) == 0) {
288 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe not valid");
292 pdeindex = (va >> PDRSHIFT) & (NPDEPG-1);
293 pde_pa = ((u_long)pdpe & PG_FRAME) + (pdeindex * sizeof(pd_entry_t));
295 s = _kvm_pa2off(kd, pde_pa, &ofs);
296 if (s < sizeof pde) {
297 _kvm_syserr(kd, kd->program, "_kvm_vatop: pde_pa not found");
300 if (lseek(kd->pmfd, ofs, 0) == -1) {
301 _kvm_err(kd, kd->program, "_kvm_vatop: lseek pde_pa");
304 if (read(kd->pmfd, &pde, sizeof pde) != sizeof pde) {
305 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pde");
308 if (((u_long)pde & PG_V) == 0) {
309 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
313 if ((u_long)pde & PG_PS) {
315 * No final-level page table; ptd describes one 2MB page.
317 #define PAGE2M_MASK (NBPDR - 1)
318 #define PG_FRAME2M (~PAGE2M_MASK)
319 a = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK);
320 s = _kvm_pa2off(kd, a, pa);
322 _kvm_err(kd, kd->program,
323 "_kvm_vatop: 2MB page address not in dump");
326 return (NBPDR - (va & PAGE2M_MASK));
330 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
331 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t));
333 s = _kvm_pa2off(kd, pte_pa, &ofs);
334 if (s < sizeof pte) {
335 _kvm_err(kd, kd->program, "_kvm_vatop: pte_pa not found");
338 if (lseek(kd->pmfd, ofs, 0) == -1) {
339 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
342 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
343 _kvm_syserr(kd, kd->program, "_kvm_vatop: read");
346 if (((u_long)pte & PG_V) == 0) {
347 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid");
351 a = ((u_long)pte & PG_FRAME) + offset;
352 s = _kvm_pa2off(kd, a, pa);
354 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump");
357 return (PAGE_SIZE - offset);
360 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
365 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
367 if (kd->vmst->minidump)
368 return (_kvm_minidump_kvatop(kd, va, pa));
370 if (kvm_ishost(kd)) {
371 _kvm_err(kd, 0, "kvm_vatop called in live kernel!");
375 return (_kvm_vatop(kd, va, pa));