2 /* $NetBSD: kvm_alpha.c,v 1.7.2.1 1997/11/02 20:34:26 mellon Exp $ */
5 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
8 * Author: Chris G. Demetriou
10 * Permission to use, copy, modify and distribute this software and
11 * its documentation is hereby granted, provided that both the copyright
12 * notice and this permission notice appear in all copies of the
13 * software, derivative works or modified versions, and any portions
14 * thereof, and that both notices appear in supporting documentation.
16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
20 * Carnegie Mellon requests users of this software to return to
22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
23 * School of Computer Science
24 * Carnegie Mellon University
25 * Pittsburgh PA 15213-3890
27 * any improvements or extensions that they make and grant Carnegie the
28 * rights to redistribute these changes.
31 #include <sys/types.h>
32 #include <sys/elf64.h>
35 #include <machine/atomic.h>
36 #include <machine/bootinfo.h>
37 #include <machine/pte.h>
44 #include "kvm_private.h"
46 #define REGION_BASE(n) (((uint64_t)(n)) << 61)
47 #define REGION_ADDR(x) ((x) & ((1LL<<61)-1LL))
49 #define NKPTEPG(ps) ((ps) / sizeof(struct ia64_lpte))
50 #define NKPTEDIR(ps) ((ps) >> 3)
51 #define KPTE_PTE_INDEX(va,ps) (((va)/(ps)) % NKPTEPG(ps))
52 #define KPTE_DIR0_INDEX(va,ps) ((((va)/(ps)) / NKPTEPG(ps)) / NKPTEDIR(ps))
53 #define KPTE_DIR1_INDEX(va,ps) ((((va)/(ps)) / NKPTEPG(ps)) % NKPTEDIR(ps))
55 #define PBVM_BASE 0x9ffc000000000000UL
56 #define PBVM_PGSZ (64 * 1024)
68 * Map the ELF headers into the process' address space. We do this in two
69 * steps: first the ELF header itself and using that information the whole
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 Elf64_Ehdr *e = kd->vmst->mmapbase;
100 Elf64_Phdr *p = (Elf64_Phdr*)((char*)e + e->e_phoff);
103 if (pa != REGION_ADDR(pa)) {
104 _kvm_err(kd, kd->program, "internal error");
108 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
113 *ofs = (pa - p->p_paddr) + p->p_offset;
115 return (p->p_memsz - (pa - p->p_paddr));
116 return (pgsz - ((size_t)pa & (pgsz - 1)));
120 _kvm_read_phys(kvm_t *kd, uint64_t pa, void *buf, size_t bufsz)
125 sz = _kvm_pa2off(kd, pa, &ofs, 0);
127 return ((ssize_t)sz);
129 if (lseek(kd->pmfd, ofs, 0) == -1)
131 return (read(kd->pmfd, buf, bufsz));
135 _kvm_freevtop(kvm_t *kd)
137 struct vmstate *vm = kd->vmst;
139 if (vm->pbvm_pgtbl != NULL)
140 free(vm->pbvm_pgtbl);
141 if (vm->mmapbase != NULL)
142 munmap(vm->mmapbase, vm->mmapsize);
148 _kvm_initvtop(kvm_t *kd)
157 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
158 if (kd->vmst == NULL) {
159 _kvm_err(kd, kd->program, "cannot allocate vm");
163 kd->vmst->pagesize = getpagesize();
165 if (_kvm_maphdrs(kd, sizeof(Elf64_Ehdr)) == -1)
168 ehdr = kd->vmst->mmapbase;
169 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
170 if (_kvm_maphdrs(kd, hdrsz) == -1)
174 * Load the PBVM page table. We need this to resolve PBVM addresses.
175 * The PBVM page table is obtained from the bootinfo structure, of
176 * which the physical address is given to us in e_entry. If e_entry
177 * is 0, then this is assumed to be a pre-PBVM kernel.
179 if (ehdr->e_entry != 0) {
180 sz = _kvm_read_phys(kd, ehdr->e_entry, &bi, sizeof(bi));
181 if (sz != sizeof(bi)) {
182 _kvm_err(kd, kd->program,
183 "cannot read bootinfo from PA %#lx", ehdr->e_entry);
186 if (bi.bi_magic != BOOTINFO_MAGIC) {
187 _kvm_err(kd, kd->program, "invalid bootinfo");
190 kd->vmst->pbvm_pgtbl = _kvm_malloc(kd, bi.bi_pbvm_pgtblsz);
191 if (kd->vmst->pbvm_pgtbl == NULL) {
192 _kvm_err(kd, kd->program, "cannot allocate page table");
195 kd->vmst->pbvm_pgtblsz = bi.bi_pbvm_pgtblsz;
196 sz = _kvm_read_phys(kd, bi.bi_pbvm_pgtbl, kd->vmst->pbvm_pgtbl,
198 if (sz != bi.bi_pbvm_pgtblsz) {
199 _kvm_err(kd, kd->program,
200 "cannot read page table from PA %#lx",
205 kd->vmst->pbvm_pgtbl = NULL;
206 kd->vmst->pbvm_pgtblsz = 0;
210 * At this point we've got enough information to use kvm_read() for
211 * direct mapped (ie region 6 and region 7) address, such as symbol
215 nl[0].n_name = "ia64_kptdir";
218 if (kvm_nlist(kd, nl) != 0) {
219 _kvm_err(kd, kd->program, "bad namelist");
223 if (kvm_read(kd, (nl[0].n_value), &va, sizeof(va)) != sizeof(va)) {
224 _kvm_err(kd, kd->program, "cannot read kptdir");
228 if (va < REGION_BASE(6)) {
229 _kvm_err(kd, kd->program, "kptdir is itself virtual");
233 kd->vmst->kptdir = va;
238 _kvm_kvatop(kvm_t *kd, u_long va, off_t *ofs)
240 struct ia64_lpte pte;
241 uint64_t pa, pgaddr, pt0addr, pt1addr;
242 size_t pgno, pgsz, pt0no, pt1no;
244 if (va >= REGION_BASE(6)) {
245 /* Regions 6 and 7: direct mapped. */
246 pa = REGION_ADDR(va);
247 return (_kvm_pa2off(kd, pa, ofs, 0));
248 } else if (va >= REGION_BASE(5)) {
249 /* Region 5: Kernel Virtual Memory. */
250 va = REGION_ADDR(va);
251 pgsz = kd->vmst->pagesize;
252 pt0no = KPTE_DIR0_INDEX(va, pgsz);
253 pt1no = KPTE_DIR1_INDEX(va, pgsz);
254 pgno = KPTE_PTE_INDEX(va, pgsz);
255 if (pt0no >= NKPTEDIR(pgsz))
257 pt0addr = kd->vmst->kptdir + (pt0no << 3);
258 if (kvm_read(kd, pt0addr, &pt1addr, 8) != 8)
262 pt1addr += pt1no << 3;
263 if (kvm_read(kd, pt1addr, &pgaddr, 8) != 8)
267 pgaddr += pgno * sizeof(pte);
268 if (kvm_read(kd, pgaddr, &pte, sizeof(pte)) != sizeof(pte))
270 if (!(pte.pte & PTE_PRESENT))
272 pa = (pte.pte & PTE_PPN_MASK) + (va & (pgsz - 1));
273 return (_kvm_pa2off(kd, pa, ofs, pgsz));
274 } else if (va >= PBVM_BASE) {
275 /* Region 4: Pre-Boot Virtual Memory (PBVM). */
279 if (pt0no >= (kd->vmst->pbvm_pgtblsz >> 3))
281 pt0addr = kd->vmst->pbvm_pgtbl[pt0no];
282 if (!(pt0addr & PTE_PRESENT))
284 pa = (pt0addr & PTE_PPN_MASK) + va % pgsz;
285 return (_kvm_pa2off(kd, pa, ofs, pgsz));
289 _kvm_err(kd, kd->program, "invalid kernel virtual address");