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5 * This code is derived from software developed by the Computer Systems
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37 * @(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93
38 * $FreeBSD: src/lib/libkvm/kvm_i386.c,v 1.11.2.1 2001/09/21 04:01:51 peter Exp $
39 * $DragonFly: src/lib/libkvm/kvm_i386.c,v 1.3 2007/04/29 01:36:04 dillon Exp $
43 * i386 machine dependent routines for kvm. Hopefully, the forthcoming
44 * vm code will one day obsolete this module.
47 #include <sys/user.h> /* MUST BE FIRST */
48 #include <sys/param.h>
52 #include <sys/elf_common.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 /* minidump must be the first item! */
75 int minidump; /* 1 = minidump mode */
82 * Map the ELF headers into the process' address space. We do this in two
83 * steps: first the ELF header itself and using that information the whole
84 * set of headers. (Taken from kvm_ia64.c)
87 _kvm_maphdrs(kvm_t *kd, size_t sz)
89 struct vmstate *vm = kd->vmst;
91 if (kd->vmst->minidump) {
92 _kvm_minidump_freevtop(kd);
96 /* munmap() previous mmap(). */
97 if (vm->mmapbase != NULL) {
98 munmap(vm->mmapbase, vm->mmapsize);
103 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
104 if (vm->mmapbase == MAP_FAILED) {
105 _kvm_err(kd, kd->program, "cannot mmap corefile");
112 * Translate a physical memory address to a file-offset in the crash-dump.
113 * (Taken from kvm_ia64.c)
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);
130 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
134 *ofs = (pa - p->p_paddr) + p->p_offset;
135 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
139 _kvm_freevtop(kvm_t *kd)
141 struct vmstate *vm = kd->vmst;
143 if (kd->vmst->minidump) {
144 _kvm_minidump_freevtop(kd);
148 if (vm->mmapbase != NULL)
149 munmap(vm->mmapbase, vm->mmapsize);
157 _kvm_initvtop(kvm_t *kd)
159 struct nlist nlist[2];
167 if (pread(kd->pmfd, &minihdr, 8, 0) == 8)
168 if (memcmp(&minihdr, "minidump", 8) == 0)
169 return (_kvm_minidump_initvtop(kd));
171 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
173 _kvm_err(kd, kd->program, "cannot allocate vm");
178 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
181 * Check if this is indeed an ELF header. If not, assume old style dump or
184 ehdr = kd->vmst->mmapbase;
185 if (!IS_ELF(*ehdr)) {
187 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
188 kd->vmst->mmapbase = NULL;
190 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
191 if (_kvm_maphdrs(kd, hdrsz) == -1)
195 nlist[0].n_name = "_kernbase";
198 if (kvm_nlist(kd, nlist) != 0)
199 kernbase = KERNBASE; /* for old kernels */
201 kernbase = nlist[0].n_value;
203 nlist[0].n_name = "_IdlePTD";
206 if (kvm_nlist(kd, nlist) != 0) {
207 _kvm_err(kd, kd->program, "bad namelist");
210 if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa, sizeof(pa)) !=
212 _kvm_err(kd, kd->program, "cannot read IdlePTD");
215 PTD = _kvm_malloc(kd, PAGE_SIZE);
216 if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) {
217 _kvm_err(kd, kd->program, "cannot read PTD");
225 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
242 PTD = (uint32_t *)vm->PTD;
243 offset = va & (PAGE_SIZE - 1);
246 * If we are initializing (kernel page table descriptor pointer
247 * not yet set) then return pa == va to avoid infinite recursion.
250 s = _kvm_pa2off(kd, va, pa);
252 _kvm_err(kd, kd->program,
253 "_kvm_vatop: bootstrap data not in dump");
256 return (PAGE_SIZE - offset);
260 pdeindex = va >> PDRSHIFT;
263 if (((u_long)pde & PG_V) == 0) {
264 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
268 if ((u_long)pde & PG_PS) {
270 * No second-level page table; ptd describes one 4MB page.
271 * (We assume that the kernel wouldn't set PG_PS without enabling
272 * it cr0, and that the kernel doesn't support 36-bit physical
275 #define PAGE4M_MASK (NBPDR - 1)
276 #define PG_FRAME4M (~PAGE4M_MASK)
278 *pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
280 pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
281 s = _kvm_pa2off(kd, pde_pa, &ofs);
282 if (s <= sizeof pde) {
283 _kvm_syserr(kd, kd->program,
284 "_kvm_vatop: pde_pa not found");
289 return (NBPDR - (va & PAGE4M_MASK));
292 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
293 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde));
295 s = _kvm_pa2off(kd, pte_pa, &ofs);
296 if (s <= sizeof pte) {
297 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
301 /* XXX This has to be a physical address read, kvm_read is virtual */
302 if (lseek(kd->pmfd, ofs, 0) == -1) {
303 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
306 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
307 _kvm_syserr(kd, kd->program, "_kvm_vatop: read");
310 if (((u_long)pte & PG_V) == 0) {
311 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
315 a = ((u_long)pte & PG_FRAME) + offset;
316 s =_kvm_pa2off(kd, a, pa);
318 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump");
321 return (PAGE_SIZE - offset);
324 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
329 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
331 if (kd->vmst->minidump)
332 return (_kvm_minidump_kvatop(kd, va, pa));
334 if (kvm_ishost(kd)) {
335 _kvm_err(kd, 0, "vatop called in live kernel!");
339 return (_kvm_vatop(kd, va, pa));