1 /*-
2 * Copyright (c) 2005 Olivier Houchard
3 * Copyright (c) 1989, 1992, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
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.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * ARM machine dependent routines for kvm.
36 */
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 #include <sys/param.h>
42 #include <sys/elf32.h>
43 #include <sys/mman.h>
44
45 #include <vm/vm.h>
46 #include <vm/vm_param.h>
47 #include <vm/pmap.h>
48
49 #include <machine/pmap.h>
50
51 #include <db.h>
52 #include <limits.h>
53 #include <kvm.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <unistd.h>
57
58 #include "kvm_private.h"
59
60 /* minidump must be the first item! */
61 struct vmstate {
62 int minidump; /* 1 = minidump mode */
63 pd_entry_t *l1pt;
64 void *mmapbase;
65 size_t mmapsize;
66 };
67
68 static int
_kvm_maphdrs(kvm_t * kd,size_t sz)69 _kvm_maphdrs(kvm_t *kd, size_t sz)
70 {
71 struct vmstate *vm = kd->vmst;
72
73 /* munmap() previous mmap(). */
74 if (vm->mmapbase != NULL) {
75 munmap(vm->mmapbase, vm->mmapsize);
76 vm->mmapbase = NULL;
77 }
78
79 vm->mmapsize = sz;
80 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
81 if (vm->mmapbase == MAP_FAILED) {
82 _kvm_err(kd, kd->program, "cannot mmap corefile");
83 return (-1);
84 }
85
86 return (0);
87 }
88
89 /*
90 * Translate a physical memory address to a file-offset in the crash-dump.
91 */
92 static size_t
_kvm_pa2off(kvm_t * kd,uint64_t pa,off_t * ofs,size_t pgsz)93 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
94 {
95 Elf32_Ehdr *e = kd->vmst->mmapbase;
96 Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff);
97 int n = e->e_phnum;
98
99 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
100 p++, n--;
101 if (n == 0)
102 return (0);
103
104 *ofs = (pa - p->p_paddr) + p->p_offset;
105 if (pgsz == 0)
106 return (p->p_memsz - (pa - p->p_paddr));
107 return (pgsz - ((size_t)pa & (pgsz - 1)));
108 }
109
110 void
_kvm_freevtop(kvm_t * kd)111 _kvm_freevtop(kvm_t *kd)
112 {
113 if (kd->vmst != 0) {
114 if (kd->vmst->minidump)
115 return (_kvm_minidump_freevtop(kd));
116 if (kd->vmst->mmapbase != NULL)
117 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
118 free(kd->vmst);
119 kd->vmst = NULL;
120 }
121 }
122
123 int
_kvm_initvtop(kvm_t * kd)124 _kvm_initvtop(kvm_t *kd)
125 {
126 struct vmstate *vm;
127 struct nlist nl[2];
128 u_long kernbase, physaddr, pa;
129 pd_entry_t *l1pt;
130 Elf32_Ehdr *ehdr;
131 Elf32_Phdr *phdr;
132 size_t hdrsz;
133 char minihdr[8];
134 int found, i;
135
136 if (!kd->rawdump) {
137 if (pread(kd->pmfd, &minihdr, 8, 0) == 8) {
138 if (memcmp(&minihdr, "minidump", 8) == 0)
139 return (_kvm_minidump_initvtop(kd));
140 } else {
141 _kvm_err(kd, kd->program, "cannot read header");
142 return (-1);
143 }
144 }
145
146 vm = _kvm_malloc(kd, sizeof(*vm));
147 if (vm == 0) {
148 _kvm_err(kd, kd->program, "cannot allocate vm");
149 return (-1);
150 }
151 kd->vmst = vm;
152 vm->l1pt = NULL;
153 if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1)
154 return (-1);
155 ehdr = kd->vmst->mmapbase;
156 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
157 if (_kvm_maphdrs(kd, hdrsz) == -1)
158 return (-1);
159
160 phdr = (Elf32_Phdr *)((uint8_t *)ehdr + ehdr->e_phoff);
161 found = 0;
162 for (i = 0; i < ehdr->e_phnum; i++) {
163 if (phdr[i].p_type == PT_DUMP_DELTA) {
164 kernbase = phdr[i].p_vaddr;
165 physaddr = phdr[i].p_paddr;
166 found = 1;
167 break;
168 }
169 }
170
171 nl[1].n_name = NULL;
172 if (!found) {
173 nl[0].n_name = "kernbase";
174 if (kvm_nlist(kd, nl) != 0)
175 kernbase = KERNBASE;
176 else
177 kernbase = nl[0].n_value;
178
179 nl[0].n_name = "physaddr";
180 if (kvm_nlist(kd, nl) != 0) {
181 _kvm_err(kd, kd->program, "couldn't get phys addr");
182 return (-1);
183 }
184 physaddr = nl[0].n_value;
185 }
186 nl[0].n_name = "kernel_l1pa";
187 if (kvm_nlist(kd, nl) != 0) {
188 _kvm_err(kd, kd->program, "bad namelist");
189 return (-1);
190 }
191 if (kvm_read(kd, (nl[0].n_value - kernbase + physaddr), &pa,
192 sizeof(pa)) != sizeof(pa)) {
193 _kvm_err(kd, kd->program, "cannot read kernel_l1pa");
194 return (-1);
195 }
196 l1pt = _kvm_malloc(kd, L1_TABLE_SIZE);
197 if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) {
198 _kvm_err(kd, kd->program, "cannot read l1pt");
199 free(l1pt);
200 return (-1);
201 }
202 vm->l1pt = l1pt;
203 return 0;
204 }
205
206 /* from arm/pmap.c */
207 #define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT)
208 /* from arm/pmap.h */
209 #define L1_TYPE_INV 0x00 /* Invalid (fault) */
210 #define L1_TYPE_C 0x01 /* Coarse L2 */
211 #define L1_TYPE_S 0x02 /* Section */
212 #define L1_TYPE_F 0x03 /* Fine L2 */
213 #define L1_TYPE_MASK 0x03 /* mask of type bits */
214
215 #define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S)
216 #define l1pte_valid(pde) ((pde) != 0)
217 #define l2pte_valid(pte) ((pte) != 0)
218 #define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT)
219
220
221 int
_kvm_kvatop(kvm_t * kd,u_long va,off_t * pa)222 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
223 {
224 struct vmstate *vm = kd->vmst;
225 pd_entry_t pd;
226 pt_entry_t pte;
227 u_long pte_pa;
228
229 if (kd->vmst->minidump)
230 return (_kvm_minidump_kvatop(kd, va, pa));
231
232 if (vm->l1pt == NULL)
233 return (_kvm_pa2off(kd, va, pa, PAGE_SIZE));
234 pd = vm->l1pt[L1_IDX(va)];
235 if (!l1pte_valid(pd))
236 goto invalid;
237 if (l1pte_section_p(pd)) {
238 /* 1MB section mapping. */
239 *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET);
240 return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE));
241 }
242 pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
243 _kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE);
244 if (lseek(kd->pmfd, pte_pa, 0) == -1) {
245 _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek");
246 goto invalid;
247 }
248 if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) {
249 _kvm_syserr(kd, kd->program, "_kvm_kvatop: read");
250 goto invalid;
251 }
252 if (!l2pte_valid(pte)) {
253 goto invalid;
254 }
255 if ((pte & L2_TYPE_MASK) == L2_TYPE_L) {
256 *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
257 return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE));
258 }
259 *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET);
260 return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE));
261 invalid:
262 _kvm_err(kd, 0, "Invalid address (%lx)", va);
263 return 0;
264 }
265
266 /*
267 * Machine-dependent initialization for ALL open kvm descriptors,
268 * not just those for a kernel crash dump. Some architectures
269 * have to deal with these NOT being constants! (i.e. m68k)
270 */
271 #ifdef FBSD_NOT_YET
272 int
_kvm_mdopen(kvm_t * kd)273 _kvm_mdopen(kvm_t *kd)
274 {
275
276 kd->usrstack = USRSTACK;
277 kd->min_uva = VM_MIN_ADDRESS;
278 kd->max_uva = VM_MAXUSER_ADDRESS;
279
280 return (0);
281 }
282 #endif
283