subr_module.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1998 Michael Smith
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/12.0/sys/kern/subr_module.c 336505 2018-07-19 20:00:28Z markj $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/linker.h>
   35 
   36 #include <vm/vm.h>
   37 #include <vm/vm_extern.h>
   38 
   39 /*
   40  * Preloaded module support
   41  */
   42 
   43 vm_offset_t preload_addr_relocate = 0;
   44 caddr_t preload_metadata;
   45 
   46 /*
   47  * Search for the preloaded module (name)
   48  */
   49 caddr_t
   50 preload_search_by_name(const char *name)
   51 {
   52     caddr_t     curp;
   53     uint32_t    *hdr;
   54     int         next;
   55     
   56     if (preload_metadata != NULL) {
   57         
   58         curp = preload_metadata;
   59         for (;;) {
   60             hdr = (uint32_t *)curp;
   61             if (hdr[0] == 0 && hdr[1] == 0)
   62                 break;
   63 
   64             /* Search for a MODINFO_NAME field */
   65             if ((hdr[0] == MODINFO_NAME) &&
   66                 !strcmp(name, curp + sizeof(uint32_t) * 2))
   67                 return(curp);
   68 
   69             /* skip to next field */
   70             next = sizeof(uint32_t) * 2 + hdr[1];
   71             next = roundup(next, sizeof(u_long));
   72             curp += next;
   73         }
   74     }
   75     return(NULL);
   76 }
   77 
   78 /*
   79  * Search for the first preloaded module of (type)
   80  */
   81 caddr_t
   82 preload_search_by_type(const char *type)
   83 {
   84     caddr_t     curp, lname;
   85     uint32_t    *hdr;
   86     int         next;
   87 
   88     if (preload_metadata != NULL) {
   89 
   90         curp = preload_metadata;
   91         lname = NULL;
   92         for (;;) {
   93             hdr = (uint32_t *)curp;
   94             if (hdr[0] == 0 && hdr[1] == 0)
   95                 break;
   96 
   97             /* remember the start of each record */
   98             if (hdr[0] == MODINFO_NAME)
   99                 lname = curp;
  100 
  101             /* Search for a MODINFO_TYPE field */
  102             if ((hdr[0] == MODINFO_TYPE) &&
  103                 !strcmp(type, curp + sizeof(uint32_t) * 2))
  104                 return(lname);
  105 
  106             /* skip to next field */
  107             next = sizeof(uint32_t) * 2 + hdr[1];
  108             next = roundup(next, sizeof(u_long));
  109             curp += next;
  110         }
  111     }
  112     return(NULL);
  113 }
  114 
  115 /*
  116  * Walk through the preloaded module list
  117  */
  118 caddr_t
  119 preload_search_next_name(caddr_t base)
  120 {
  121     caddr_t     curp;
  122     uint32_t    *hdr;
  123     int         next;
  124     
  125     if (preload_metadata != NULL) {
  126         
  127         /* Pick up where we left off last time */
  128         if (base) {
  129             /* skip to next field */
  130             curp = base;
  131             hdr = (uint32_t *)curp;
  132             next = sizeof(uint32_t) * 2 + hdr[1];
  133             next = roundup(next, sizeof(u_long));
  134             curp += next;
  135         } else
  136             curp = preload_metadata;
  137 
  138         for (;;) {
  139             hdr = (uint32_t *)curp;
  140             if (hdr[0] == 0 && hdr[1] == 0)
  141                 break;
  142 
  143             /* Found a new record? */
  144             if (hdr[0] == MODINFO_NAME)
  145                 return curp;
  146 
  147             /* skip to next field */
  148             next = sizeof(uint32_t) * 2 + hdr[1];
  149             next = roundup(next, sizeof(u_long));
  150             curp += next;
  151         }
  152     }
  153     return(NULL);
  154 }
  155 
  156 /*
  157  * Given a preloaded module handle (mod), return a pointer
  158  * to the data for the attribute (inf).
  159  */
  160 caddr_t
  161 preload_search_info(caddr_t mod, int inf)
  162 {
  163     caddr_t     curp;
  164     uint32_t    *hdr;
  165     uint32_t    type = 0;
  166     int         next;
  167 
  168     if (mod == NULL)
  169         return (NULL);
  170 
  171     curp = mod;
  172     for (;;) {
  173         hdr = (uint32_t *)curp;
  174         /* end of module data? */
  175         if (hdr[0] == 0 && hdr[1] == 0)
  176             break;
  177         /* 
  178          * We give up once we've looped back to what we were looking at 
  179          * first - this should normally be a MODINFO_NAME field.
  180          */
  181         if (type == 0) {
  182             type = hdr[0];
  183         } else {
  184             if (hdr[0] == type)
  185                 break;
  186         }
  187         
  188         /* 
  189          * Attribute match? Return pointer to data.
  190          * Consumer may safely assume that size value precedes  
  191          * data.
  192          */
  193         if (hdr[0] == inf)
  194             return(curp + (sizeof(uint32_t) * 2));
  195 
  196         /* skip to next field */
  197         next = sizeof(uint32_t) * 2 + hdr[1];
  198         next = roundup(next, sizeof(u_long));
  199         curp += next;
  200     }
  201     return(NULL);
  202 }
  203 
  204 /*
  205  * Delete a preload record by name.
  206  */
  207 void
  208 preload_delete_name(const char *name)
  209 {
  210     caddr_t     addr, curp;
  211     uint32_t    *hdr, sz;
  212     int         next;
  213     int         clearing;
  214 
  215     addr = 0;
  216     sz = 0;
  217     
  218     if (preload_metadata != NULL) {
  219 
  220         clearing = 0;
  221         curp = preload_metadata;
  222         for (;;) {
  223             hdr = (uint32_t *)curp;
  224             if (hdr[0] == MODINFO_NAME || (hdr[0] == 0 && hdr[1] == 0)) {
  225                 /* Free memory used to store the file. */
  226                 if (addr != 0 && sz != 0)
  227                     kmem_bootstrap_free((vm_offset_t)addr, sz);
  228                 addr = 0;
  229                 sz = 0;
  230 
  231                 if (hdr[0] == 0)
  232                     break;
  233                 if (!strcmp(name, curp + sizeof(uint32_t) * 2))
  234                     clearing = 1;       /* got it, start clearing */
  235                 else if (clearing) {
  236                     clearing = 0;       /* at next one now.. better stop */
  237                 }
  238             }
  239             if (clearing) {
  240                 if (hdr[0] == MODINFO_ADDR)
  241                     addr = *(caddr_t *)(curp + sizeof(uint32_t) * 2);
  242                 else if (hdr[0] == MODINFO_SIZE)
  243                     sz = *(uint32_t *)(curp + sizeof(uint32_t) * 2);
  244                 hdr[0] = MODINFO_EMPTY;
  245             }
  246 
  247             /* skip to next field */
  248             next = sizeof(uint32_t) * 2 + hdr[1];
  249             next = roundup(next, sizeof(u_long));
  250             curp += next;
  251         }
  252     }
  253 }
  254 
  255 void *
  256 preload_fetch_addr(caddr_t mod)
  257 {
  258         caddr_t *mdp;
  259 
  260         mdp = (caddr_t *)preload_search_info(mod, MODINFO_ADDR);
  261         if (mdp == NULL)
  262                 return (NULL);
  263         return (*mdp + preload_addr_relocate);
  264 }
  265 
  266 size_t
  267 preload_fetch_size(caddr_t mod)
  268 {
  269         size_t *mdp;
  270 
  271         mdp = (size_t *)preload_search_info(mod, MODINFO_SIZE);
  272         if (mdp == NULL)
  273                 return (0);
  274         return (*mdp);
  275 }
  276 
  277 /* Called from locore.  Convert physical pointers to kvm. Sigh. */
  278 void
  279 preload_bootstrap_relocate(vm_offset_t offset)
  280 {
  281     caddr_t     curp;
  282     uint32_t    *hdr;
  283     vm_offset_t *ptr;
  284     int         next;
  285     
  286     if (preload_metadata != NULL) {
  287         
  288         curp = preload_metadata;
  289         for (;;) {
  290             hdr = (uint32_t *)curp;
  291             if (hdr[0] == 0 && hdr[1] == 0)
  292                 break;
  293 
  294             /* Deal with the ones that we know we have to fix */
  295             switch (hdr[0]) {
  296             case MODINFO_ADDR:
  297             case MODINFO_METADATA|MODINFOMD_SSYM:
  298             case MODINFO_METADATA|MODINFOMD_ESYM:
  299                 ptr = (vm_offset_t *)(curp + (sizeof(uint32_t) * 2));
  300                 *ptr += offset;
  301                 break;
  302             }
  303             /* The rest is beyond us for now */
  304 
  305             /* skip to next field */
  306             next = sizeof(uint32_t) * 2 + hdr[1];
  307             next = roundup(next, sizeof(u_long));
  308             curp += next;
  309         }
  310     }
  311 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_module.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_module.c