Basic implementation of in-kernel symbol table manager + /dev/ksyms.
This commit is contained in:
ragge
parent
1f4176dbb6
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44305abd0b
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@ -0,0 +1,799 @@
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/* $NetBSD: kern_ksyms.c,v 1.1 2003/04/24 19:56:43 ragge Exp $ */
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/*
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* Copyright (c) 2001, 2003 Anders Magnusson (ragge@ludd.luth.se).
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* All rights reserved.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Code to deal with in-kernel symbol table management + /dev/ksyms.
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*
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* For each loaded module the symbol table info is kept track of by a
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* struct, placed in a circular list. The first entry is the kernel
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* symbol table.
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*/
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/*
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* TODO:
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* Fix quick-search of symbols. (comes with linker)
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* Change the ugly way of adding new symbols (comes with linker)
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* Add kernel locking stuff.
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* (Ev) add support for poll.
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* (Ev) fix support for mmap.
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*
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* Export ksyms internal logic for use in post-mortem debuggers?
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* Need to move struct symtab to ksyms.h for that.
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*/
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#ifdef _KERNEL
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#include "opt_ddb.h"
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#endif
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/queue.h>
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#include <sys/exec.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <machine/elf_machdep.h> /* XXX */
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#define ELFSIZE ARCH_ELFSIZE
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#include <sys/exec_elf.h>
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#include <sys/ksyms.h>
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#include <lib/libkern/libkern.h>
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#ifdef DDB
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#include <ddb/db_output.h>
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#endif
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#include "ksyms.h"
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static int ksymsinited = 0;
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#if NKSYMS
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static void ksyms_hdr_init(caddr_t hdraddr);
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static void ksyms_sizes_calc(void);
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static int ksyms_isopen;
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#endif
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#ifdef KSYMS_DEBUG
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#define FOLLOW_CALLS 1
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#define FOLLOW_MORE_CALLS 2
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#define FOLLOW_DEVKSYMS 4
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static int ksyms_debug;
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#endif
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#if NKSYMS
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dev_type_open(ksymsopen);
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dev_type_close(ksymsclose);
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dev_type_read(ksymsread);
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dev_type_write(ksymswrite);
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dev_type_ioctl(ksymsioctl);
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const struct cdevsw ksyms_cdevsw = {
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ksymsopen, ksymsclose, ksymsread, ksymswrite, ksymsioctl,
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nullstop, notty, nopoll, nommap, nullkqfilter, DV_DULL
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};
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#endif
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/*
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* Store the different symbol tables in a double-linked list.
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*/
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struct symtab {
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CIRCLEQ_ENTRY(symtab) sd_queue;
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char *sd_name; /* Name of this table */
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Elf_Sym *sd_symstart; /* Address of symbol table */
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caddr_t sd_strstart; /* Adderss of corresponding string table */
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int sd_symsize; /* Size in bytes of symbol table */
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int sd_strsize; /* Size of string table */
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int *sd_symnmoff; /* Used when calculating the name offset */
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};
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static CIRCLEQ_HEAD(, symtab) symtab_queue =
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CIRCLEQ_HEAD_INITIALIZER(symtab_queue);
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static struct symtab kernel_symtab;
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/*
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* Finds a certain symbol name in a certain symbol table.
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* XXX - symbol hashing must be rewritten (missing)
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*/
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static Elf_Sym *
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findsym(char *name, struct symtab *table)
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{
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Elf_Sym *start = table->sd_symstart;
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int i, sz = table->sd_symsize/sizeof(Elf_Sym);
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char *np;
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for (i = 0; i < sz; i++) {
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np = table->sd_strstart + start[i].st_name;
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if (name[0] == np[0] && name[1] == np[1] &&
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strcmp(name, np) == 0)
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return &start[i];
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}
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return NULL;
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}
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/*
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* The "attach" is in reality done in ksyms_init().
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*/
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void ksymsattach(int);
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void
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ksymsattach(int arg)
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{
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}
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/*
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* Add a symbol table named name.
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* This is intended for use when the kernel loader enters the table.
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*/
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static void
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addsymtab(char *name, Elf_Ehdr *ehdr, struct symtab *tab)
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{
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caddr_t start = (caddr_t)ehdr;
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Elf_Shdr *shdr;
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Elf_Sym *sym;
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int i, j;
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/* Find the symbol table and the corresponding string table. */
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shdr = (Elf_Shdr *)(start + ehdr->e_shoff);
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for (i = 1; i < ehdr->e_shnum; i++) {
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if (shdr[i].sh_type != SHT_SYMTAB)
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continue;
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if (shdr[i].sh_offset == 0)
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continue;
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tab->sd_symstart = (Elf_Sym *)(start + shdr[i].sh_offset);
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tab->sd_symsize = shdr[i].sh_size;
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j = shdr[i].sh_link;
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if (shdr[j].sh_offset == 0)
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continue; /* Can this happen? */
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tab->sd_strstart = start + shdr[j].sh_offset;
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tab->sd_strsize = shdr[j].sh_size;
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break;
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}
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tab->sd_name = name;
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/* Change all symbols to be absolute references */
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sym = (Elf_Sym *)tab->sd_symstart;
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for (i = 0; i < tab->sd_symsize/sizeof(Elf_Sym); i++)
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sym[i].st_shndx = SHN_ABS;
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CIRCLEQ_INSERT_HEAD(&symtab_queue, tab, sd_queue);
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}
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/*
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* Setup the kernel symbol table stuff.
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*/
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void
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ksyms_init(caddr_t start, caddr_t end)
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{
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Elf_Ehdr *ehdr = (Elf_Ehdr *)start;
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/* check if this is a valid ELF header */
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/* No reason to verify arch type, the kernel is actually running! */
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if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||
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ehdr->e_ident[EI_CLASS] != ELFCLASS ||
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ehdr->e_version > 1) {
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printf("Kernel symbol table invalid!\n");
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return; /* nothing to do */
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}
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addsymtab("netbsd", ehdr, &kernel_symtab);
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#if NKSYMS
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ksyms_sizes_calc();
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#endif
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ksymsinited = 1;
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#ifdef DEBUG
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printf("Loaded initial symtab at %p, strtab at %p, # entries %ld\n",
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kernel_symtab.sd_symstart, kernel_symtab.sd_strstart,
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kernel_symtab.sd_symsize/sizeof(Elf_Sym));
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#endif
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#if NKSYMS
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ksyms_hdr_init(start);
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#endif
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}
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/*
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* Get the value associated with a symbol.
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* "mod" is the module name, or null if any module.
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* "sym" is the symbol name.
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* "val" is a pointer to the corresponding value, if call succeeded.
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* Returns 0 if success or ENOENT if no such entry.
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*/
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int
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ksyms_getval(char *mod, char *sym, unsigned long *val, int type)
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{
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struct symtab *st;
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Elf_Sym *es;
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if (ksymsinited == 0)
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return ENOENT;
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#ifdef KSYMS_DEBUG
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if (ksyms_debug & FOLLOW_CALLS)
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printf("ksyms_getval: mod %s sym %s valp %p\n", mod, sym, val);
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#endif
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/* XXX search order XXX */
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CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
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if (mod && strcmp(st->sd_name, mod))
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continue;
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if ((es = findsym(sym, st)) == NULL)
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continue;
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/* Skip if bad binding */
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if (type == KSYMS_EXTERN &&
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ELF_ST_BIND(es->st_info) != STB_GLOBAL)
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continue;
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if (val)
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*val = es->st_value;
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return 0;
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}
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return ENOENT;
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}
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/*
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* Get "mod" and "symbol" associated with an address.
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* Returns 0 if success or ENOENT if no such entry.
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*/
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int
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ksyms_getname(char **mod, char **sym, vaddr_t v, int f)
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{
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struct symtab *st;
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Elf_Sym *les, *es = NULL;
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vaddr_t laddr = 0;
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char *lmod, *stable;
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int type, i, sz;
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if (ksymsinited == 0)
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return ENOENT;
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CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
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sz = st->sd_symsize/sizeof(Elf_Sym);
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for (i = 0; i < sz; i++) {
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les = st->sd_symstart + i;
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type = ELF_ST_TYPE(les->st_info);
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if ((f & KSYMS_PROC) && (type != STT_FUNC))
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continue;
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if (type == STT_NOTYPE)
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continue;
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if (((f & KSYMS_ANY) == 0) &&
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(type != STT_FUNC) && (type != STT_OBJECT))
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continue;
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if ((les->st_value <= v) && (les->st_value > laddr)) {
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laddr = les->st_value;
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es = les;
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lmod = st->sd_name;
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stable = st->sd_strstart;
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}
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}
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}
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if (es == NULL)
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return ENOENT;
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if ((f & KSYMS_EXACT) && (v != es->st_value))
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return ENOENT;
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if (mod)
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*mod = lmod;
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if (sym)
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*sym = stable + es->st_name;
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return 0;
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}
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#if NKSYMS
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static int symsz, strsz;
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static void
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ksyms_sizes_calc(void)
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{
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struct symtab *st;
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int i;
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symsz = strsz = 0;
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CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
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if (st != &kernel_symtab) {
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for (i = 0; i < st->sd_symsize/sizeof(Elf_Sym); i++)
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st->sd_symstart[i].st_name =
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strsz + st->sd_symnmoff[i];
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}
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symsz += st->sd_symsize;
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strsz += st->sd_strsize;
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}
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}
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#endif
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/*
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* Temporary work buffers for dynamic loaded symbol tables.
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* Will go away when in-kernel linker is in place.
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*/
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#define NSAVEDSYMS 512
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#define SZSYMNAMES NSAVEDSYMS*8 /* Just an approximation */
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static Elf_Sym savedsyms[NSAVEDSYMS];
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static int symnmoff[NSAVEDSYMS];
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static char symnames[SZSYMNAMES];
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static int cursyms, curnamep;
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/*
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* Add a symbol to the temporary save area for symbols.
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* This routine will go away when the in-kernel linker is in place.
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*/
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static void
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addsym(Elf_Sym *sym, char *name)
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{
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int len;
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#ifdef KSYMS_DEBUG
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if (ksyms_debug & FOLLOW_MORE_CALLS)
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printf("addsym: name %s val %lx\n", name, (long)sym->st_value);
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#endif
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if (cursyms == NSAVEDSYMS ||
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((len = strlen(name)) + curnamep + 1) > SZSYMNAMES) {
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printf("addsym: too many sumbols, skipping '%s'\n", name);
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return;
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}
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strcpy(&symnames[curnamep], name);
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savedsyms[cursyms] = *sym;
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symnmoff[cursyms] = savedsyms[cursyms].st_name = curnamep;
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curnamep += (len + 1);
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cursyms++;
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}
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/*
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* Adds a symbol table.
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* "name" is the module name, "start" and "size" is where the symbol table
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* is located, and "type" is in which binary format the symbol table is.
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* New memory for keeping the symbol table is allocated in this function.
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* Returns 0 if success and EEXIST if the module name is in use.
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*/
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int
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ksyms_addsymtab(char *mod, void *symstart, vsize_t symsize,
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char *strstart, vsize_t strsize)
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{
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Elf_Sym *sym = symstart;
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struct symtab *st;
|
||||||
|
long rval;
|
||||||
|
int i;
|
||||||
|
char *str;
|
||||||
|
|
||||||
|
#ifdef KSYMS_DEBUG
|
||||||
|
if (ksyms_debug & FOLLOW_CALLS)
|
||||||
|
printf("ksyms_addsymtab: mod %s symsize %lx strsize %lx\n",
|
||||||
|
mod, symsize, strsize);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if NKSYMS
|
||||||
|
/*
|
||||||
|
* Do not try to add a symbol table while someone is reading
|
||||||
|
* from /dev/ksyms.
|
||||||
|
*/
|
||||||
|
while (ksyms_isopen != 0)
|
||||||
|
tsleep(&ksyms_isopen, PWAIT, "ksyms", 0);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Check if this symtab already loaded */
|
||||||
|
CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
|
||||||
|
if (strcmp(mod, st->sd_name) == 0)
|
||||||
|
return EEXIST;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* XXX - Only add a symbol if it do not exist already.
|
||||||
|
* This is because of a flaw in the current LKM implementation,
|
||||||
|
* the loop will be removed once the in-kernel linker is in place.
|
||||||
|
*/
|
||||||
|
cursyms = curnamep = 0;
|
||||||
|
for (i = 0; i < symsize/sizeof(Elf_Sym); i++) {
|
||||||
|
if (sym[i].st_name == 0)
|
||||||
|
continue; /* Just ignore */
|
||||||
|
|
||||||
|
/* check validity of the symbol */
|
||||||
|
/* XXX - save local symbols if DDB */
|
||||||
|
if (ELF_ST_BIND(sym[i].st_info) != STB_GLOBAL)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
/* Check if the symbol exists */
|
||||||
|
if (ksyms_getval(NULL, strstart + sym[i].st_name,
|
||||||
|
&rval, KSYMS_EXTERN) == 0) {
|
||||||
|
/* Check (and complain) about differing values */
|
||||||
|
if (sym[i].st_value != rval) {
|
||||||
|
printf("%s: symbol '%s' redeclared with "
|
||||||
|
"different value (%lx != %lx)\n",
|
||||||
|
mod, strstart + sym[i].st_name,
|
||||||
|
rval, (long)sym[i].st_value);
|
||||||
|
}
|
||||||
|
} else
|
||||||
|
/* Ok, save this symbol */
|
||||||
|
addsym(&sym[i], strstart + sym[i].st_name);
|
||||||
|
}
|
||||||
|
sym = malloc(sizeof(Elf_Sym)*cursyms, M_DEVBUF, M_WAITOK);
|
||||||
|
str = malloc(curnamep, M_DEVBUF, M_WAITOK);
|
||||||
|
memcpy(sym, savedsyms, sizeof(Elf_Sym)*cursyms);
|
||||||
|
memcpy(str, symnames, curnamep);
|
||||||
|
|
||||||
|
st = malloc(sizeof(struct symtab), M_DEVBUF, M_WAITOK);
|
||||||
|
st->sd_name = malloc(strlen(mod)+1, M_DEVBUF, M_WAITOK);
|
||||||
|
strcpy(st->sd_name, mod);
|
||||||
|
st->sd_symnmoff = malloc(sizeof(int)*cursyms, M_DEVBUF, M_WAITOK);
|
||||||
|
memcpy(st->sd_symnmoff, symnmoff, sizeof(int)*cursyms);
|
||||||
|
st->sd_symstart = sym;
|
||||||
|
st->sd_symsize = sizeof(Elf_Sym)*cursyms;
|
||||||
|
st->sd_strstart = str;
|
||||||
|
st->sd_strsize = curnamep;
|
||||||
|
|
||||||
|
/* Make them absolute references */
|
||||||
|
sym = st->sd_symstart;
|
||||||
|
for (i = 0; i < st->sd_symsize/sizeof(Elf_Sym); i++)
|
||||||
|
sym[i].st_shndx = SHN_ABS;
|
||||||
|
|
||||||
|
CIRCLEQ_INSERT_TAIL(&symtab_queue, st, sd_queue);
|
||||||
|
#if NKSYMS
|
||||||
|
ksyms_sizes_calc();
|
||||||
|
#endif
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Remove a symbol table specified by name.
|
||||||
|
* Returns 0 if success, EBUSY if device open and ENOENT if no such name.
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
ksyms_delsymtab(char *mod)
|
||||||
|
{
|
||||||
|
struct symtab *st;
|
||||||
|
int found = 0;
|
||||||
|
|
||||||
|
#if NKSYMS
|
||||||
|
/*
|
||||||
|
* Do not try to delete a symbol table while someone is reading
|
||||||
|
* from /dev/ksyms.
|
||||||
|
*/
|
||||||
|
while (ksyms_isopen != 0)
|
||||||
|
tsleep(&ksyms_isopen, PWAIT, "ksyms", 0);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
|
||||||
|
if (strcmp(mod, st->sd_name) == 0) {
|
||||||
|
found = 1;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (found == 0)
|
||||||
|
return ENOENT;
|
||||||
|
CIRCLEQ_REMOVE(&symtab_queue, st, sd_queue);
|
||||||
|
free(st->sd_symstart, M_DEVBUF);
|
||||||
|
free(st->sd_strstart, M_DEVBUF);
|
||||||
|
free(st->sd_symnmoff, M_DEVBUF);
|
||||||
|
free(st->sd_name, M_DEVBUF);
|
||||||
|
free(st, M_DEVBUF);
|
||||||
|
#if NKSYMS
|
||||||
|
ksyms_sizes_calc();
|
||||||
|
#endif
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifdef DDB
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Keep sifting stuff here, to avoid export of ksyms internals.
|
||||||
|
*/
|
||||||
|
int
|
||||||
|
ksyms_sift(char *mod, char *sym, int mode)
|
||||||
|
{
|
||||||
|
struct symtab *st;
|
||||||
|
char *sb;
|
||||||
|
int i, sz;
|
||||||
|
|
||||||
|
if (ksymsinited == 0)
|
||||||
|
return ENOENT;
|
||||||
|
|
||||||
|
CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
|
||||||
|
if (mod && strcmp(mod, st->sd_name))
|
||||||
|
continue;
|
||||||
|
sb = st->sd_strstart;
|
||||||
|
|
||||||
|
sz = st->sd_symsize/sizeof(Elf_Sym);
|
||||||
|
for (i = 0; i < sz; i++) {
|
||||||
|
Elf_Sym *les = st->sd_symstart + i;
|
||||||
|
char c;
|
||||||
|
|
||||||
|
if (strstr(sb + les->st_name, sym) == NULL)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
if (mode == 'F') {
|
||||||
|
switch (ELF_ST_TYPE(les->st_info)) {
|
||||||
|
case STT_OBJECT:
|
||||||
|
c = '+';
|
||||||
|
break;
|
||||||
|
case STT_FUNC:
|
||||||
|
c = '*';
|
||||||
|
break;
|
||||||
|
case STT_SECTION:
|
||||||
|
c = '&';
|
||||||
|
break;
|
||||||
|
case STT_FILE:
|
||||||
|
c = '/';
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
c = ' ';
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
db_printf("%s%c ", sb + les->st_name, c);
|
||||||
|
} else
|
||||||
|
db_printf("%s ", sb + les->st_name);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return ENOENT;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#if NKSYMS
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Static allocated ELF header.
|
||||||
|
* Basic info is filled in at attach, sizes at open.
|
||||||
|
*/
|
||||||
|
#define SYMTAB 1
|
||||||
|
#define STRTAB 2
|
||||||
|
#define SHSTRTAB 3
|
||||||
|
#define NSECHDR 4
|
||||||
|
|
||||||
|
#define NPRGHDR 2
|
||||||
|
#define SHSTRSIZ 28
|
||||||
|
|
||||||
|
static struct ksyms_hdr {
|
||||||
|
Elf_Ehdr kh_ehdr;
|
||||||
|
Elf_Phdr kh_phdr[NPRGHDR];
|
||||||
|
Elf_Shdr kh_shdr[NSECHDR];
|
||||||
|
char kh_strtab[SHSTRSIZ];
|
||||||
|
} ksyms_hdr;
|
||||||
|
|
||||||
|
|
||||||
|
void
|
||||||
|
ksyms_hdr_init(caddr_t hdraddr)
|
||||||
|
{
|
||||||
|
|
||||||
|
/* Copy the loaded elf exec header */
|
||||||
|
memcpy(&ksyms_hdr.kh_ehdr, hdraddr, sizeof(Elf_Ehdr));
|
||||||
|
|
||||||
|
/* Set correct program/section header sizes, offsets and numbers */
|
||||||
|
ksyms_hdr.kh_ehdr.e_phoff = offsetof(struct ksyms_hdr, kh_phdr[0]);
|
||||||
|
ksyms_hdr.kh_ehdr.e_phentsize = sizeof(Elf_Phdr);
|
||||||
|
ksyms_hdr.kh_ehdr.e_phnum = NPRGHDR;
|
||||||
|
ksyms_hdr.kh_ehdr.e_shoff = offsetof(struct ksyms_hdr, kh_shdr[0]);
|
||||||
|
ksyms_hdr.kh_ehdr.e_shentsize = sizeof(Elf_Shdr);
|
||||||
|
ksyms_hdr.kh_ehdr.e_shnum = NSECHDR;
|
||||||
|
ksyms_hdr.kh_ehdr.e_shstrndx = NSECHDR - 1; /* Last section */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Keep program headers zeroed (unused).
|
||||||
|
* The section headers are hand-crafted.
|
||||||
|
* First section is section zero.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/* Second section header; ".symtab" */
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_name = 1; /* Section 3 offset */
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_type = SHT_SYMTAB;
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_offset = sizeof(struct ksyms_hdr);
|
||||||
|
/* ksyms_hdr.kh_shdr[SYMTAB].sh_size = filled in at open */
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_link = 2; /* Corresponding strtab */
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_info = 0; /* XXX */
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_addralign = sizeof(long);
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_entsize = sizeof(Elf_Sym);
|
||||||
|
|
||||||
|
/* Third section header; ".strtab" */
|
||||||
|
ksyms_hdr.kh_shdr[STRTAB].sh_name = 9; /* Section 3 offset */
|
||||||
|
ksyms_hdr.kh_shdr[STRTAB].sh_type = SHT_STRTAB;
|
||||||
|
/* ksyms_hdr.kh_shdr[STRTAB].sh_offset = filled in at open */
|
||||||
|
/* ksyms_hdr.kh_shdr[STRTAB].sh_size = filled in at open */
|
||||||
|
/* ksyms_hdr.kh_shdr[STRTAB].sh_link = kept zero */
|
||||||
|
ksyms_hdr.kh_shdr[STRTAB].sh_info = 0;
|
||||||
|
ksyms_hdr.kh_shdr[STRTAB].sh_addralign = sizeof(char);
|
||||||
|
ksyms_hdr.kh_shdr[STRTAB].sh_entsize = 0;
|
||||||
|
|
||||||
|
/* Fourth section, ".shstrtab" */
|
||||||
|
ksyms_hdr.kh_shdr[SHSTRTAB].sh_name = 17; /* This section name offset */
|
||||||
|
ksyms_hdr.kh_shdr[SHSTRTAB].sh_type = SHT_STRTAB;
|
||||||
|
ksyms_hdr.kh_shdr[SHSTRTAB].sh_offset =
|
||||||
|
offsetof(struct ksyms_hdr, kh_strtab);
|
||||||
|
ksyms_hdr.kh_shdr[SHSTRTAB].sh_size = SHSTRSIZ;
|
||||||
|
ksyms_hdr.kh_shdr[SHSTRTAB].sh_addralign = sizeof(char);
|
||||||
|
|
||||||
|
/* Set section names */
|
||||||
|
strcpy(&ksyms_hdr.kh_strtab[1], ".symtab");
|
||||||
|
strcpy(&ksyms_hdr.kh_strtab[9], ".strtab");
|
||||||
|
strcpy(&ksyms_hdr.kh_strtab[17], ".shstrtab");
|
||||||
|
};
|
||||||
|
|
||||||
|
int
|
||||||
|
ksymsopen(dev_t dev, int oflags, int devtype, struct proc *p)
|
||||||
|
{
|
||||||
|
|
||||||
|
if (minor(dev))
|
||||||
|
return ENXIO;
|
||||||
|
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_size = symsz;
|
||||||
|
ksyms_hdr.kh_shdr[STRTAB].sh_offset = symsz +
|
||||||
|
ksyms_hdr.kh_shdr[SYMTAB].sh_offset;
|
||||||
|
ksyms_hdr.kh_shdr[STRTAB].sh_size = strsz;
|
||||||
|
ksyms_isopen = 1;
|
||||||
|
|
||||||
|
#ifdef KSYMS_DEBUG
|
||||||
|
if (ksyms_debug & FOLLOW_DEVKSYMS)
|
||||||
|
printf("ksymsopen: symsz 0x%x strsz 0x%x\n", symsz, strsz);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
ksymsclose(dev_t dev, int oflags, int devtype, struct proc *p)
|
||||||
|
{
|
||||||
|
|
||||||
|
#ifdef KSYMS_DEBUG
|
||||||
|
if (ksyms_debug & FOLLOW_DEVKSYMS)
|
||||||
|
printf("ksymsclose\n");
|
||||||
|
#endif
|
||||||
|
|
||||||
|
ksyms_isopen = 0;
|
||||||
|
wakeup(&ksyms_isopen);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
#define HDRSIZ sizeof(struct ksyms_hdr)
|
||||||
|
|
||||||
|
int
|
||||||
|
ksymsread(dev_t dev, struct uio *uio, int ioflag)
|
||||||
|
{
|
||||||
|
struct symtab *st;
|
||||||
|
size_t filepos, inpos, off;
|
||||||
|
|
||||||
|
#ifdef KSYMS_DEBUG
|
||||||
|
if (ksyms_debug & FOLLOW_DEVKSYMS)
|
||||||
|
printf("ksymsread: offset 0x%llx resid 0x%lx\n",
|
||||||
|
(long long)uio->uio_offset, uio->uio_resid);
|
||||||
|
#endif
|
||||||
|
if (ksymsinited == 0)
|
||||||
|
return ENXIO;
|
||||||
|
|
||||||
|
off = uio->uio_offset;
|
||||||
|
if (off >= (strsz + symsz + HDRSIZ))
|
||||||
|
return 0; /* End of symtab */
|
||||||
|
/*
|
||||||
|
* First: Copy out the ELF header.
|
||||||
|
*/
|
||||||
|
if (off < HDRSIZ)
|
||||||
|
uiomove((char *)&ksyms_hdr + off, HDRSIZ - off, uio);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copy out the symbol table.
|
||||||
|
*/
|
||||||
|
filepos = HDRSIZ;
|
||||||
|
CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
|
||||||
|
if (uio->uio_resid == 0)
|
||||||
|
return 0;
|
||||||
|
if (uio->uio_offset <= st->sd_symsize + filepos) {
|
||||||
|
inpos = uio->uio_offset - filepos;
|
||||||
|
uiomove((char *)st->sd_symstart + inpos,
|
||||||
|
st->sd_symsize - inpos, uio);
|
||||||
|
}
|
||||||
|
filepos += st->sd_symsize;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (filepos != HDRSIZ + symsz)
|
||||||
|
panic("ksymsread: unsunc");
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copy out the string table
|
||||||
|
*/
|
||||||
|
CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
|
||||||
|
if (uio->uio_resid == 0)
|
||||||
|
return 0;
|
||||||
|
if (uio->uio_offset <= st->sd_strsize + filepos) {
|
||||||
|
inpos = uio->uio_offset - filepos;
|
||||||
|
uiomove((char *)st->sd_strstart + inpos,
|
||||||
|
st->sd_strsize - inpos, uio);
|
||||||
|
}
|
||||||
|
filepos += st->sd_strsize;
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
ksymswrite(dev_t dev, struct uio *uio, int ioflag)
|
||||||
|
{
|
||||||
|
return EROFS;
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
ksymsioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct proc *p)
|
||||||
|
{
|
||||||
|
#ifdef notyet
|
||||||
|
struct ksyms_gsymbol *kg = (struct ksyms_gsymbol *)data;
|
||||||
|
struct symtab *st;
|
||||||
|
Elf_Sym *sym;
|
||||||
|
unsigned long val;
|
||||||
|
int error = 0;
|
||||||
|
|
||||||
|
switch (cmd) {
|
||||||
|
case KIOCGVALUE:
|
||||||
|
/*
|
||||||
|
* Use the in-kernel symbol lookup code for fast
|
||||||
|
* retreival of a value.
|
||||||
|
*/
|
||||||
|
if (error = copyinstr(kg->kg_name, symnm, maxsymnmsz, NULL))
|
||||||
|
break;
|
||||||
|
if (error = ksyms_getval(NULL, symnm, &val, KSYMS_EXTERN))
|
||||||
|
break;
|
||||||
|
error = copyout(&val, kg->kg_value, sizeof(long));
|
||||||
|
break;
|
||||||
|
|
||||||
|
case KIOCGSYMBOL:
|
||||||
|
/*
|
||||||
|
* Use the in-kernel symbol lookup code for fast
|
||||||
|
* retreival of a symbol.
|
||||||
|
*/
|
||||||
|
if (error = copyinstr(kg->kg_name, symnm, maxsymnmsz, NULL))
|
||||||
|
break;
|
||||||
|
CIRCLEQ_FOREACH(st, &symtab_queue, sd_queue) {
|
||||||
|
if ((sym = findsym(symnm, st)) == NULL)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
/* Skip if bad binding */
|
||||||
|
if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL) {
|
||||||
|
sym = NULL;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (sym != NULL)
|
||||||
|
error = copyout(sym, kg->kg_sym, sizeof(Elf_Sym));
|
||||||
|
else
|
||||||
|
error = ENOENT;
|
||||||
|
break;
|
||||||
|
|
||||||
|
case KIOCGSIZE:
|
||||||
|
/*
|
||||||
|
* Get total size of symbol table.
|
||||||
|
*/
|
||||||
|
*(int *)data = strsz + symsz + HDRSIZ;
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
error = ENOTTY;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
return ENOTTY;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
@ -0,0 +1,68 @@
|
||||||
|
/* $NetBSD: ksyms.h,v 1.1 2003/04/24 19:56:44 ragge Exp $ */
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2001, 2003 Anders Magnusson (ragge@ludd.luth.se).
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* 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.
|
||||||
|
* 3. The name of the author may not be used to endorse or promote products
|
||||||
|
* derived from this software without specific prior written permission
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Definitions used in ksyms_getname() and ksyms_getval().
|
||||||
|
*/
|
||||||
|
#define KSYMS_CLOSEST 0001 /* Nearest lower match */
|
||||||
|
#define KSYMS_EXACT 0002 /* Only exact match allowed */
|
||||||
|
#define KSYMS_EXTERN 0000 /* Only external symbols (pseudo) */
|
||||||
|
#define KSYMS_PROC 0100 /* Procedures only */
|
||||||
|
#define KSYMS_ANY 0200 /* Also local symbols (DDB use only) */
|
||||||
|
|
||||||
|
#ifdef notyet
|
||||||
|
/*
|
||||||
|
* Do a lookup of a symbol using the in-kernel lookup algorithm.
|
||||||
|
*/
|
||||||
|
|
||||||
|
struct ksyms_gsymbol {
|
||||||
|
char *kg_name;
|
||||||
|
union {
|
||||||
|
Elf_Sym *ku_sym;
|
||||||
|
unsigned long *ku_value;
|
||||||
|
} _un;
|
||||||
|
#define kg_sym _un.ku_sym
|
||||||
|
#define kg_value _un.ku_value
|
||||||
|
};
|
||||||
|
|
||||||
|
#define KIOCGSYMBOL _IOW('l', 1, struct ksyms_gsymbol)
|
||||||
|
#define KIOCGVALUE _IOW('l', 2, struct ksyms_gsymbol)
|
||||||
|
#define KIOCGSIZE _IOR('l', 3, int)
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Prototypes
|
||||||
|
*/
|
||||||
|
int ksyms_getname(char **, char **, vaddr_t, int);
|
||||||
|
int ksyms_getval(char *, char *, unsigned long *, int);
|
||||||
|
int ksyms_addsymtab(char *, void *, vsize_t, char *, vsize_t);
|
||||||
|
int ksyms_delsymtab(char *);
|
||||||
|
void ksyms_init(caddr_t, caddr_t);
|
||||||
|
#ifdef DDB
|
||||||
|
int ksyms_sift(char *mod, char *sym, int mode);
|
||||||
|
#endif
|
||||||
Loading…
Reference in New Issue