2 * Copyright (c) 2005 Olivier Houchard
3 * Copyright (c) 1989, 1992, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software developed by the Computer Systems
7 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
8 * BG 91-66 and contributed to Berkeley.
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35 * ARM machine dependent routines for kvm.
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/elf32.h>
47 #include <vm/vm_param.h>
49 #include <machine/pmap.h>
51 #include "../../sys/arm/include/pte.h"
52 #include "../../sys/arm/include/vmparam.h"
62 #include "kvm_private.h"
64 /* minidump must be the first item! */
66 int minidump; /* 1 = minidump mode */
73 _kvm_maphdrs(kvm_t *kd, size_t sz)
75 struct vmstate *vm = kd->vmst;
77 /* munmap() previous mmap(). */
78 if (vm->mmapbase != NULL) {
79 munmap(vm->mmapbase, vm->mmapsize);
84 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
85 if (vm->mmapbase == MAP_FAILED) {
86 _kvm_err(kd, kd->program, "cannot mmap corefile");
94 * Translate a physical memory address to a file-offset in the crash-dump.
97 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
99 Elf32_Ehdr *e = kd->vmst->mmapbase;
100 Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff);
103 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
108 *ofs = (pa - p->p_paddr) + p->p_offset;
110 return (p->p_memsz - (pa - p->p_paddr));
111 return (pgsz - ((size_t)pa & (pgsz - 1)));
115 _kvm_freevtop(kvm_t *kd)
118 if (kd->vmst->minidump)
119 return (_kvm_minidump_freevtop(kd));
120 if (kd->vmst->mmapbase != NULL)
121 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
128 _kvm_initvtop(kvm_t *kd)
132 u_long kernbase, physaddr, pa;
141 if (pread(kd->pmfd, &minihdr, 8, 0) == 8) {
142 if (memcmp(&minihdr, "minidump", 8) == 0)
143 return (_kvm_minidump_initvtop(kd));
145 _kvm_err(kd, kd->program, "cannot read header");
150 vm = _kvm_malloc(kd, sizeof(*vm));
152 _kvm_err(kd, kd->program, "cannot allocate vm");
157 if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1)
159 ehdr = kd->vmst->mmapbase;
160 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
161 if (_kvm_maphdrs(kd, hdrsz) == -1)
164 phdr = (Elf32_Phdr *)((uint8_t *)ehdr + ehdr->e_phoff);
166 for (i = 0; i < ehdr->e_phnum; i++) {
167 if (phdr[i].p_type == PT_DUMP_DELTA) {
168 kernbase = phdr[i].p_vaddr;
169 physaddr = phdr[i].p_paddr;
177 nl[0].n_name = "kernbase";
178 if (kvm_nlist(kd, nl) != 0)
181 kernbase = nl[0].n_value;
183 nl[0].n_name = "physaddr";
184 if (kvm_nlist(kd, nl) != 0) {
185 _kvm_err(kd, kd->program, "couldn't get phys addr");
188 physaddr = nl[0].n_value;
190 nl[0].n_name = "kernel_l1pa";
191 if (kvm_nlist(kd, nl) != 0) {
192 _kvm_err(kd, kd->program, "bad namelist");
195 if (kvm_read(kd, (nl[0].n_value - kernbase + physaddr), &pa,
196 sizeof(pa)) != sizeof(pa)) {
197 _kvm_err(kd, kd->program, "cannot read kernel_l1pa");
200 l1pt = _kvm_malloc(kd, L1_TABLE_SIZE);
201 if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) {
202 _kvm_err(kd, kd->program, "cannot read l1pt");
210 /* from arm/pmap.c */
211 #define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT)
212 /* from arm/pmap.h */
213 #define L1_TYPE_INV 0x00 /* Invalid (fault) */
214 #define L1_TYPE_C 0x01 /* Coarse L2 */
215 #define L1_TYPE_S 0x02 /* Section */
216 #define L1_TYPE_F 0x03 /* Fine L2 */
217 #define L1_TYPE_MASK 0x03 /* mask of type bits */
219 #define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S)
220 #define l1pte_valid(pde) ((pde) != 0)
221 #define l2pte_valid(pte) ((pte) != 0)
222 #define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT)
226 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
228 struct vmstate *vm = kd->vmst;
233 if (kd->vmst->minidump)
234 return (_kvm_minidump_kvatop(kd, va, pa));
236 if (vm->l1pt == NULL)
237 return (_kvm_pa2off(kd, va, pa, PAGE_SIZE));
238 pd = vm->l1pt[L1_IDX(va)];
239 if (!l1pte_valid(pd))
241 if (l1pte_section_p(pd)) {
242 /* 1MB section mapping. */
243 *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET);
244 return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE));
246 pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
247 _kvm_pa2off(kd, pte_pa, &pte_pa, L1_S_SIZE);
248 if (lseek(kd->pmfd, pte_pa, 0) == -1) {
249 _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek");
252 if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) {
253 _kvm_syserr(kd, kd->program, "_kvm_kvatop: read");
256 if (!l2pte_valid(pte)) {
259 if ((pte & L2_TYPE_MASK) == L2_TYPE_L) {
260 *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
261 return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE));
263 *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET);
264 return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE));
266 _kvm_err(kd, 0, "Invalid address (%lx)", va);
271 * Machine-dependent initialization for ALL open kvm descriptors,
272 * not just those for a kernel crash dump. Some architectures
273 * have to deal with these NOT being constants! (i.e. m68k)
277 _kvm_mdopen(kvm_t *kd)
280 kd->usrstack = USRSTACK;
281 kd->min_uva = VM_MIN_ADDRESS;
282 kd->max_uva = VM_MAXUSER_ADDRESS;