ab35544b83
- Add a kvaddr_type to represent kernel virtual addresses instead of unsigned long. - Add a struct kvm_nlist which is a stripped down version of struct nlist that uses kvaddr_t for n_value. - Add a kvm_native() routine that returns true if an open kvm descriptor is for a native kernel and memory image. - Add a kvm_open2() function similar to kvm_openfiles(). It drops the unused 'swapfile' argument and adds a new function pointer argument for a symbol resolving function. Native kernels still use _fdnlist() from libc to resolve symbols if a resolver function is not supplied, but cross kernels require a resolver. - Add a kvm_nlist2() function similar to kvm_nlist() except that it uses struct kvm_nlist instead of struct nlist. - Add a kvm_read2() function similar to kvm_read() except that it uses kvaddr_t instead of unsigned long for the kernel virtual address. - Add a new kvm_arch switch of routines needed by a vmcore backend. Each backend is responsible for implementing kvm_read2() for a given vmcore format. - Use libelf to read headers from ELF kernels and cores (except for powerpc cores). - Add internal helper routines for the common page offset hash table used by the minidump backends. - Port all of the existing kvm backends to implement a kvm_arch switch and to be cross-friendly by using private constants instead of ones that vary by platform (e.g. PAGE_SIZE). Static assertions are present when a given backend is compiled natively to ensure the private constants match the real ones. - Enable all of the existing vmcore backends on all platforms. This means that libkvm on any platform should be able to perform KVA translation and read data from a vmcore of any platform. Tested on: amd64, i386, sparc64 (marius) Differential Revision: https://reviews.freebsd.org/D3341
160 lines
5.6 KiB
C
160 lines
5.6 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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* BG 91-66 and contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kvm_private.h 8.1 (Berkeley) 6/4/93
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* $FreeBSD$
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*/
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#include <sys/endian.h>
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#include <sys/linker_set.h>
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#include <gelf.h>
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struct kvm_arch {
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int (*ka_probe)(kvm_t *);
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int (*ka_initvtop)(kvm_t *);
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void (*ka_freevtop)(kvm_t *);
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int (*ka_kvatop)(kvm_t *, kvaddr_t, off_t *);
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int (*ka_native)(kvm_t *);
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};
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#define KVM_ARCH(ka) DATA_SET(kvm_arch, ka)
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struct __kvm {
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struct kvm_arch *arch;
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/*
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* a string to be prepended to error messages
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* provided for compatibility with sun's interface
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* if this value is null, errors are saved in errbuf[]
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*/
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const char *program;
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char *errp; /* XXX this can probably go away */
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char errbuf[_POSIX2_LINE_MAX];
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#define ISALIVE(kd) ((kd)->vmfd >= 0)
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int pmfd; /* physical memory file (or crashdump) */
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int vmfd; /* virtual memory file (-1 if crashdump) */
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int nlfd; /* namelist file (e.g., /kernel) */
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GElf_Ehdr nlehdr; /* ELF file header for namelist file */
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int (*resolve_symbol)(const char *, kvaddr_t *);
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struct kinfo_proc *procbase;
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char *argspc; /* (dynamic) storage for argv strings */
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int arglen; /* length of the above */
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char **argv; /* (dynamic) storage for argv pointers */
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int argc; /* length of above (not actual # present) */
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char *argbuf; /* (dynamic) temporary storage */
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/*
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* Kernel virtual address translation state. This only gets filled
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* in for dead kernels; otherwise, the running kernel (i.e. kmem)
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* will do the translations for us. It could be big, so we
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* only allocate it if necessary.
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*/
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struct vmstate *vmst;
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int rawdump; /* raw dump format */
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int vnet_initialized; /* vnet fields set up */
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kvaddr_t vnet_start; /* start of kernel's vnet region */
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kvaddr_t vnet_stop; /* stop of kernel's vnet region */
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kvaddr_t vnet_current; /* vnet we're working with */
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kvaddr_t vnet_base; /* vnet base of current vnet */
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/*
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* Dynamic per-CPU kernel memory. We translate symbols, on-demand,
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* to the data associated with dpcpu_curcpu, set with
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* kvm_dpcpu_setcpu().
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*/
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int dpcpu_initialized; /* dpcpu fields set up */
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kvaddr_t dpcpu_start; /* start of kernel's dpcpu region */
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kvaddr_t dpcpu_stop; /* stop of kernel's dpcpu region */
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u_int dpcpu_maxcpus; /* size of base array */
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uintptr_t *dpcpu_off; /* base array, indexed by CPU ID */
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u_int dpcpu_curcpu; /* CPU we're currently working with */
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kvaddr_t dpcpu_curoff; /* dpcpu base of current CPU */
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};
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/*
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* Page table hash used by minidump backends to map physical addresses
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* to file offsets.
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*/
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struct hpte {
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struct hpte *next;
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uint64_t pa;
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off_t off;
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};
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#define HPT_SIZE 1024
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struct hpt {
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struct hpte *hpt_head[HPT_SIZE];
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};
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/*
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* Functions used internally by kvm, but across kvm modules.
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*/
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static inline uint32_t
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_kvm32toh(kvm_t *kd, uint32_t val)
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{
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if (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB)
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return (le32toh(val));
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else
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return (be32toh(val));
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}
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static inline uint64_t
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_kvm64toh(kvm_t *kd, uint64_t val)
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{
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if (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB)
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return (le64toh(val));
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else
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return (be64toh(val));
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}
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void _kvm_err(kvm_t *kd, const char *program, const char *fmt, ...)
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__printflike(3, 4);
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void _kvm_freeprocs(kvm_t *kd);
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void *_kvm_malloc(kvm_t *kd, size_t);
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int _kvm_nlist(kvm_t *, struct kvm_nlist *, int);
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void *_kvm_realloc(kvm_t *kd, void *, size_t);
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void _kvm_syserr (kvm_t *kd, const char *program, const char *fmt, ...)
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__printflike(3, 4);
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int _kvm_vnet_selectpid(kvm_t *, pid_t);
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int _kvm_vnet_initialized(kvm_t *, int);
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kvaddr_t _kvm_vnet_validaddr(kvm_t *, kvaddr_t);
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int _kvm_dpcpu_initialized(kvm_t *, int);
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kvaddr_t _kvm_dpcpu_validaddr(kvm_t *, kvaddr_t);
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int _kvm_probe_elf_kernel(kvm_t *, int, int);
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int _kvm_is_minidump(kvm_t *);
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int _kvm_read_core_phdrs(kvm_t *, size_t *, GElf_Phdr **);
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void _kvm_hpt_init(kvm_t *, struct hpt *, void *, size_t, off_t, int, int);
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off_t _kvm_hpt_find(struct hpt *, uint64_t);
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void _kvm_hpt_free(struct hpt *);
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