1/* $FreeBSD: head/lib/libkvm/kvm_ia64.c 105607 2002-10-21 04:21:12Z marcel $ */
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1/* $FreeBSD: head/lib/libkvm/kvm_ia64.c 115084 2003-05-16 21:26:42Z marcel $ */ |
2/* $NetBSD: kvm_alpha.c,v 1.7.2.1 1997/11/02 20:34:26 mellon Exp $ */ 3 4/* 5 * Copyright (c) 1994, 1995 Carnegie-Mellon University. 6 * All rights reserved. 7 * 8 * Author: Chris G. Demetriou 9 * 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. 15 * 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. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie the 28 * rights to redistribute these changes. 29 */ 30 31#include <sys/types.h> 32#include <sys/elf64.h> 33#include <sys/mman.h> 34 35#include <machine/pte.h> 36 37#include <kvm.h> 38#include <limits.h> 39#include <stdlib.h> 40#include <unistd.h> 41 42#include "kvm_private.h" 43 44#define REGION_BASE(n) (((uint64_t)(n)) << 61) 45#define REGION_ADDR(x) ((x) & ((1LL<<61)-1LL)) 46 47#define NKPTEPG(ps) ((ps) / sizeof(struct ia64_lpte)) 48#define KPTE_PTE_INDEX(va,ps) (((va)/(ps)) % NKPTEPG(ps)) 49#define KPTE_DIR_INDEX(va,ps) (((va)/(ps)) / NKPTEPG(ps)) 50 51struct vmstate { 52 void *mmapbase; 53 size_t mmapsize; 54 size_t pagesize; 55 u_long kptdir; 56}; 57 58/* 59 * Map the ELF headers into the process' address space. We do this in two 60 * steps: first the ELF header itself and using that information the whole 61 * set of headers. 62 */ 63static int 64_kvm_maphdrs(kvm_t *kd, size_t sz) 65{ 66 struct vmstate *vm = kd->vmst; 67 68 /* munmap() previous mmap(). */ 69 if (vm->mmapbase != NULL) { 70 munmap(vm->mmapbase, vm->mmapsize); 71 vm->mmapbase = NULL; 72 } 73 74 vm->mmapsize = sz; 75 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, NULL); 76 if (vm->mmapbase == MAP_FAILED) { 77 _kvm_err(kd, kd->program, "cannot mmap corefile"); 78 return (-1); 79 } 80 81 return (0); 82} 83 84/* 85 * Translate a physical memory address to a file-offset in the crash-dump. 86 */ 87static size_t 88_kvm_pa2off(kvm_t *kd, uint64_t pa, u_long *ofs, size_t pgsz) 89{ 90 Elf64_Ehdr *e = kd->vmst->mmapbase; 91 Elf64_Phdr *p = (Elf64_Phdr*)((char*)e + e->e_phoff); 92 int n = e->e_phnum; 93 94 if (pa != REGION_ADDR(pa)) { 95 _kvm_err(kd, kd->program, "internal error"); 96 return (0); 97 } 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 110void 111_kvm_freevtop(kvm_t *kd) 112{ 113 struct vmstate *vm = kd->vmst; 114 115 if (vm->mmapbase != NULL) 116 munmap(vm->mmapbase, vm->mmapsize); 117 free(vm); 118 kd->vmst = NULL; 119} 120 121int 122_kvm_initvtop(kvm_t *kd) 123{ 124 struct nlist nlist[2]; 125 uint64_t va; 126 Elf64_Ehdr *ehdr; 127 size_t hdrsz; 128 129 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); 130 if (kd->vmst == NULL) { 131 _kvm_err(kd, kd->program, "cannot allocate vm"); 132 return (-1); 133 } 134 135 kd->vmst->pagesize = getpagesize(); 136 137 if (_kvm_maphdrs(kd, sizeof(Elf64_Ehdr)) == -1) 138 return (-1); 139 140 ehdr = kd->vmst->mmapbase; 141 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 142 if (_kvm_maphdrs(kd, hdrsz) == -1) 143 return (-1); 144 145 /* 146 * At this point we've got enough information to use kvm_read() for 147 * direct mapped (ie region 6 and region 7) address, such as symbol 148 * addresses/values. 149 */ 150
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151 nlist[0].n_name = "kptdir";
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151 nlist[0].n_name = "ia64_kptdir"; |
152 nlist[1].n_name = 0; 153 154 if (kvm_nlist(kd, nlist) != 0) { 155 _kvm_err(kd, kd->program, "bad namelist"); 156 return (-1); 157 } 158 159 if (kvm_read(kd, (nlist[0].n_value), &va, sizeof(va)) != sizeof(va)) { 160 _kvm_err(kd, kd->program, "cannot read kptdir"); 161 return (-1); 162 } 163 164 if (va < REGION_BASE(6)) { 165 _kvm_err(kd, kd->program, "kptdir is itself virtual"); 166 return (-1); 167 } 168 169 kd->vmst->kptdir = va; 170 return (0); 171} 172 173int 174_kvm_kvatop(kvm_t *kd, u_long va, u_long *pa) 175{ 176 struct ia64_lpte pte; 177 uint64_t pgaddr, ptaddr; 178 size_t pgno, pgsz, ptno; 179 180 if (va >= REGION_BASE(6)) { 181 /* Regions 6 and 7: direct mapped. */ 182 return (_kvm_pa2off(kd, REGION_ADDR(va), pa, 0)); 183 } else if (va >= REGION_BASE(5)) { 184 /* Region 5: virtual. */ 185 va = REGION_ADDR(va); 186 pgsz = kd->vmst->pagesize; 187 ptno = KPTE_DIR_INDEX(va, pgsz); 188 pgno = KPTE_PTE_INDEX(va, pgsz); 189 if (ptno >= (pgsz >> 3)) 190 goto fail; 191 ptaddr = kd->vmst->kptdir + (ptno << 3); 192 if (kvm_read(kd, ptaddr, &pgaddr, 8) != 8) 193 goto fail; 194 if (pgaddr == 0) 195 goto fail; 196 pgaddr += (pgno * sizeof(pte)); 197 if (kvm_read(kd, pgaddr, &pte, sizeof(pte)) != sizeof(pte)) 198 goto fail; 199 if (!pte.pte_p) 200 goto fail; 201 va = ((u_long)pte.pte_ppn << 12) + (va & (pgsz - 1)); 202 return (_kvm_pa2off(kd, va, pa, pgsz)); 203 } 204 205 fail: 206 _kvm_err(kd, kd->program, "invalid kernel virtual address"); 207 *pa = ~0UL; 208 return (0); 209}
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