mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
7f911abe54
- 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
/*-
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software developed by the Computer Systems
|
|
* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
|
|
* BG 91-66 and contributed to Berkeley.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)kvm_private.h 8.1 (Berkeley) 6/4/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/endian.h>
|
|
#include <sys/linker_set.h>
|
|
#include <gelf.h>
|
|
|
|
struct kvm_arch {
|
|
int (*ka_probe)(kvm_t *);
|
|
int (*ka_initvtop)(kvm_t *);
|
|
void (*ka_freevtop)(kvm_t *);
|
|
int (*ka_kvatop)(kvm_t *, kvaddr_t, off_t *);
|
|
int (*ka_native)(kvm_t *);
|
|
};
|
|
|
|
#define KVM_ARCH(ka) DATA_SET(kvm_arch, ka)
|
|
|
|
struct __kvm {
|
|
struct kvm_arch *arch;
|
|
/*
|
|
* a string to be prepended to error messages
|
|
* provided for compatibility with sun's interface
|
|
* if this value is null, errors are saved in errbuf[]
|
|
*/
|
|
const char *program;
|
|
char *errp; /* XXX this can probably go away */
|
|
char errbuf[_POSIX2_LINE_MAX];
|
|
#define ISALIVE(kd) ((kd)->vmfd >= 0)
|
|
int pmfd; /* physical memory file (or crashdump) */
|
|
int vmfd; /* virtual memory file (-1 if crashdump) */
|
|
int nlfd; /* namelist file (e.g., /kernel) */
|
|
GElf_Ehdr nlehdr; /* ELF file header for namelist file */
|
|
int (*resolve_symbol)(const char *, kvaddr_t *);
|
|
struct kinfo_proc *procbase;
|
|
char *argspc; /* (dynamic) storage for argv strings */
|
|
int arglen; /* length of the above */
|
|
char **argv; /* (dynamic) storage for argv pointers */
|
|
int argc; /* length of above (not actual # present) */
|
|
char *argbuf; /* (dynamic) temporary storage */
|
|
/*
|
|
* Kernel virtual address translation state. This only gets filled
|
|
* in for dead kernels; otherwise, the running kernel (i.e. kmem)
|
|
* will do the translations for us. It could be big, so we
|
|
* only allocate it if necessary.
|
|
*/
|
|
struct vmstate *vmst;
|
|
int rawdump; /* raw dump format */
|
|
|
|
int vnet_initialized; /* vnet fields set up */
|
|
kvaddr_t vnet_start; /* start of kernel's vnet region */
|
|
kvaddr_t vnet_stop; /* stop of kernel's vnet region */
|
|
kvaddr_t vnet_current; /* vnet we're working with */
|
|
kvaddr_t vnet_base; /* vnet base of current vnet */
|
|
|
|
/*
|
|
* Dynamic per-CPU kernel memory. We translate symbols, on-demand,
|
|
* to the data associated with dpcpu_curcpu, set with
|
|
* kvm_dpcpu_setcpu().
|
|
*/
|
|
int dpcpu_initialized; /* dpcpu fields set up */
|
|
kvaddr_t dpcpu_start; /* start of kernel's dpcpu region */
|
|
kvaddr_t dpcpu_stop; /* stop of kernel's dpcpu region */
|
|
u_int dpcpu_maxcpus; /* size of base array */
|
|
uintptr_t *dpcpu_off; /* base array, indexed by CPU ID */
|
|
u_int dpcpu_curcpu; /* CPU we're currently working with */
|
|
kvaddr_t dpcpu_curoff; /* dpcpu base of current CPU */
|
|
};
|
|
|
|
/*
|
|
* Page table hash used by minidump backends to map physical addresses
|
|
* to file offsets.
|
|
*/
|
|
struct hpte {
|
|
struct hpte *next;
|
|
uint64_t pa;
|
|
off_t off;
|
|
};
|
|
|
|
#define HPT_SIZE 1024
|
|
|
|
struct hpt {
|
|
struct hpte *hpt_head[HPT_SIZE];
|
|
};
|
|
|
|
/*
|
|
* Functions used internally by kvm, but across kvm modules.
|
|
*/
|
|
static inline uint32_t
|
|
_kvm32toh(kvm_t *kd, uint32_t val)
|
|
{
|
|
|
|
if (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB)
|
|
return (le32toh(val));
|
|
else
|
|
return (be32toh(val));
|
|
}
|
|
|
|
static inline uint64_t
|
|
_kvm64toh(kvm_t *kd, uint64_t val)
|
|
{
|
|
|
|
if (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB)
|
|
return (le64toh(val));
|
|
else
|
|
return (be64toh(val));
|
|
}
|
|
|
|
void _kvm_err(kvm_t *kd, const char *program, const char *fmt, ...)
|
|
__printflike(3, 4);
|
|
void _kvm_freeprocs(kvm_t *kd);
|
|
void *_kvm_malloc(kvm_t *kd, size_t);
|
|
int _kvm_nlist(kvm_t *, struct kvm_nlist *, int);
|
|
void *_kvm_realloc(kvm_t *kd, void *, size_t);
|
|
void _kvm_syserr (kvm_t *kd, const char *program, const char *fmt, ...)
|
|
__printflike(3, 4);
|
|
int _kvm_vnet_selectpid(kvm_t *, pid_t);
|
|
int _kvm_vnet_initialized(kvm_t *, int);
|
|
kvaddr_t _kvm_vnet_validaddr(kvm_t *, kvaddr_t);
|
|
int _kvm_dpcpu_initialized(kvm_t *, int);
|
|
kvaddr_t _kvm_dpcpu_validaddr(kvm_t *, kvaddr_t);
|
|
int _kvm_probe_elf_kernel(kvm_t *, int, int);
|
|
int _kvm_is_minidump(kvm_t *);
|
|
int _kvm_read_core_phdrs(kvm_t *, size_t *, GElf_Phdr **);
|
|
void _kvm_hpt_init(kvm_t *, struct hpt *, void *, size_t, off_t, int, int);
|
|
off_t _kvm_hpt_find(struct hpt *, uint64_t);
|
|
void _kvm_hpt_free(struct hpt *);
|