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>
46 #include <vm/vm_param.h>
49 #include <machine/pmap.h>
57 #include "kvm_private.h"
59 /* minidump must be the first item! */
61 int minidump; /* 1 = minidump mode */
68 _kvm_maphdrs(kvm_t *kd, size_t sz)
70 struct vmstate *vm = kd->vmst;
72 /* munmap() previous mmap(). */
73 if (vm->mmapbase != NULL) {
74 munmap(vm->mmapbase, vm->mmapsize);
79 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
80 if (vm->mmapbase == MAP_FAILED) {
81 _kvm_err(kd, kd->program, "cannot mmap corefile");
89 * Translate a physical memory address to a file-offset in the crash-dump.
92 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
94 Elf32_Ehdr *e = kd->vmst->mmapbase;
95 Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff);
98 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
103 *ofs = (pa - p->p_paddr) + p->p_offset;
105 return (p->p_memsz - (pa - p->p_paddr));
106 return (pgsz - ((size_t)pa & (pgsz - 1)));
110 _kvm_freevtop(kvm_t *kd)
113 if (kd->vmst->minidump)
114 return (_kvm_minidump_freevtop(kd));
115 if (kd->vmst->mmapbase != NULL)
116 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
123 _kvm_initvtop(kvm_t *kd)
126 struct nlist nlist[2];
127 u_long kernbase, physaddr, pa;
134 if (pread(kd->pmfd, &minihdr, 8, 0) == 8) {
135 if (memcmp(&minihdr, "minidump", 8) == 0)
136 return (_kvm_minidump_initvtop(kd));
138 _kvm_err(kd, kd->program, "cannot read header");
143 vm = _kvm_malloc(kd, sizeof(*vm));
145 _kvm_err(kd, kd->program, "cannot allocate vm");
150 if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1)
152 ehdr = kd->vmst->mmapbase;
153 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
154 if (_kvm_maphdrs(kd, hdrsz) == -1)
156 nlist[0].n_name = "kernbase";
157 nlist[1].n_name = NULL;
158 if (kvm_nlist(kd, nlist) != 0)
161 kernbase = nlist[0].n_value;
163 nlist[0].n_name = "physaddr";
164 if (kvm_nlist(kd, nlist) != 0) {
165 _kvm_err(kd, kd->program, "couldn't get phys addr");
168 physaddr = nlist[0].n_value;
169 nlist[0].n_name = "kernel_l1pa";
170 if (kvm_nlist(kd, nlist) != 0) {
171 _kvm_err(kd, kd->program, "bad namelist");
174 if (kvm_read(kd, (nlist[0].n_value - kernbase + physaddr), &pa,
175 sizeof(pa)) != sizeof(pa)) {
176 _kvm_err(kd, kd->program, "cannot read kernel_l1pa");
179 l1pt = _kvm_malloc(kd, L1_TABLE_SIZE);
180 if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) {
181 _kvm_err(kd, kd->program, "cannot read l1pt");
189 /* from arm/pmap.c */
190 #define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT)
191 /* from arm/pmap.h */
192 #define L1_TYPE_INV 0x00 /* Invalid (fault) */
193 #define L1_TYPE_C 0x01 /* Coarse L2 */
194 #define L1_TYPE_S 0x02 /* Section */
195 #define L1_TYPE_F 0x03 /* Fine L2 */
196 #define L1_TYPE_MASK 0x03 /* mask of type bits */
198 #define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S)
199 #define l1pte_valid(pde) ((pde) != 0)
200 #define l2pte_valid(pte) ((pte) != 0)
201 #define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT)
205 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
207 u_long offset = va & (PAGE_SIZE - 1);
208 struct vmstate *vm = kd->vmst;
213 if (kd->vmst->minidump)
214 return (_kvm_minidump_kvatop(kd, va, pa));
216 if (vm->l1pt == NULL)
217 return (_kvm_pa2off(kd, va, pa, PAGE_SIZE));
218 pd = vm->l1pt[L1_IDX(va)];
219 if (!l1pte_valid(pd))
221 if (l1pte_section_p(pd)) {
222 /* 1MB section mapping. */
223 *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET);
224 return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE));
226 pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
227 _kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE);
228 if (lseek(kd->pmfd, pte_pa, 0) == -1) {
229 _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek");
232 if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) {
233 _kvm_syserr(kd, kd->program, "_kvm_kvatop: read");
236 if (!l2pte_valid(pte)) {
239 if ((pte & L2_TYPE_MASK) == L2_TYPE_L) {
240 *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
241 return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE));
243 *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET);
244 return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE));
246 _kvm_err(kd, 0, "Invalid address (%x)", va);
251 * Machine-dependent initialization for ALL open kvm descriptors,
252 * not just those for a kernel crash dump. Some architectures
253 * have to deal with these NOT being constants! (i.e. m68k)
261 kd->usrstack = USRSTACK;
262 kd->min_uva = VM_MIN_ADDRESS;
263 kd->max_uva = VM_MAXUSER_ADDRESS;