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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33 * @(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93
34 * $FreeBSD: src/lib/libkvm/kvm_i386.c,v 1.11.2.1 2001/09/21 04:01:51 peter Exp $
38 * i386 machine dependent routines for kvm. Hopefully, the forthcoming
39 * vm code will one day obsolete this module.
42 #include <sys/user.h> /* MUST BE FIRST */
43 #include <sys/param.h>
47 #include <sys/elf_common.h>
55 #include <vm/vm_param.h>
57 #include <machine/elf.h>
61 #include "kvm_private.h"
64 #define btop(x) (i386_btop(x))
65 #define ptob(x) (i386_ptob(x))
68 /* minidump must be the first item! */
70 int minidump; /* 1 = minidump mode */
77 * Map the ELF headers into the process' address space. We do this in two
78 * steps: first the ELF header itself and using that information the whole
79 * set of headers. (Taken from kvm_ia64.c)
82 _kvm_maphdrs(kvm_t *kd, size_t sz)
84 struct vmstate *vm = kd->vmst;
86 if (kd->vmst->minidump) {
87 _kvm_minidump_freevtop(kd);
91 /* munmap() previous mmap(). */
92 if (vm->mmapbase != NULL) {
93 munmap(vm->mmapbase, vm->mmapsize);
98 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
99 if (vm->mmapbase == MAP_FAILED) {
100 _kvm_err(kd, kd->program, "cannot mmap corefile");
107 * Translate a physical memory address to a file-offset in the crash-dump.
108 * (Taken from kvm_ia64.c)
111 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
113 Elf_Ehdr *e = kd->vmst->mmapbase;
119 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
122 p = (Elf_Phdr*)((char*)e + e->e_phoff);
125 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
129 *ofs = (pa - p->p_paddr) + p->p_offset;
130 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
134 _kvm_freevtop(kvm_t *kd)
136 struct vmstate *vm = kd->vmst;
138 if (kd->vmst->minidump) {
139 _kvm_minidump_freevtop(kd);
143 if (vm->mmapbase != NULL)
144 munmap(vm->mmapbase, vm->mmapsize);
152 _kvm_initvtop(kvm_t *kd)
154 struct nlist nlist[2];
163 if (pread(kd->pmfd, &minihdr, 8, 0) == 8)
164 if (memcmp(&minihdr, "minidump", 8) == 0)
165 return (_kvm_minidump_initvtop(kd));
167 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
169 _kvm_err(kd, kd->program, "cannot allocate vm");
174 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
177 * Check if this is indeed an ELF header. If not, assume old style dump or
180 ehdr = kd->vmst->mmapbase;
181 if (!IS_ELF(*ehdr)) {
183 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
184 kd->vmst->mmapbase = NULL;
186 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
187 if (_kvm_maphdrs(kd, hdrsz) == -1)
191 nlist[0].n_name = "_kernbase";
194 if (kvm_nlist(kd, nlist) != 0)
195 kernbase = KERNBASE; /* for old kernels */
197 kernbase = nlist[0].n_value;
199 nlist[0].n_name = "_dumppcb";
202 if (kvm_nlist(kd, nlist) != 0) {
203 _kvm_err(kd, kd->program, "bad namelist");
207 if (kvm_read(kd, (nlist[0].n_value - kernbase), &dumppcb,
208 sizeof(dumppcb)) != sizeof(dumppcb)) {
209 _kvm_err(kd, kd->program, "cannot read dumppcb");
212 pa = dumppcb.pcb_cr3 & PG_FRAME;
214 PTD = _kvm_malloc(kd, PAGE_SIZE);
215 if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) {
216 _kvm_err(kd, kd->program, "cannot read PTD");
224 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
241 PTD = (uint32_t *)vm->PTD;
242 offset = va & (PAGE_SIZE - 1);
245 * If we are initializing (kernel page table descriptor pointer
246 * not yet set) then return pa == va to avoid infinite recursion.
249 s = _kvm_pa2off(kd, va, pa);
251 _kvm_err(kd, kd->program,
252 "_kvm_vatop: bootstrap data not in dump");
255 return (PAGE_SIZE - offset);
259 pdeindex = va >> PDRSHIFT;
262 if (((u_long)pde & PG_V) == 0) {
263 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
267 if ((u_long)pde & PG_PS) {
269 * No second-level page table; ptd describes one 4MB page.
270 * (We assume that the kernel wouldn't set PG_PS without enabling
271 * it cr0, and that the kernel doesn't support 36-bit physical
274 #define PAGE4M_MASK (NBPDR - 1)
275 #define PG_FRAME4M (~PAGE4M_MASK)
277 *pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
279 pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
280 s = _kvm_pa2off(kd, pde_pa, &ofs);
281 if (s < sizeof pde) {
282 _kvm_syserr(kd, kd->program,
283 "_kvm_vatop: pde_pa not found");
288 return (NBPDR - (va & PAGE4M_MASK));
291 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
292 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde));
294 s = _kvm_pa2off(kd, pte_pa, &ofs);
295 if (s < sizeof pte) {
296 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
300 /* XXX This has to be a physical address read, kvm_read is virtual */
301 if (lseek(kd->pmfd, ofs, 0) == -1) {
302 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
305 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
306 _kvm_syserr(kd, kd->program, "_kvm_vatop: read");
309 if (((u_long)pte & PG_V) == 0) {
310 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
314 a = ((u_long)pte & PG_FRAME) + offset;
315 s =_kvm_pa2off(kd, a, pa);
317 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump");
320 return (PAGE_SIZE - offset);
323 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
328 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
330 if (kd->vmst->minidump)
331 return (_kvm_minidump_kvatop(kd, va, pa));
333 if (kvm_ishost(kd)) {
334 _kvm_err(kd, 0, "vatop called in live kernel!");
338 return (_kvm_vatop(kd, va, pa));