kern_linker.c revision 100488
125537Sdfr/*- 259603Sdfr * Copyright (c) 1997-2000 Doug Rabson 325537Sdfr * All rights reserved. 425537Sdfr * 525537Sdfr * Redistribution and use in source and binary forms, with or without 625537Sdfr * modification, are permitted provided that the following conditions 725537Sdfr * are met: 825537Sdfr * 1. Redistributions of source code must retain the above copyright 925537Sdfr * notice, this list of conditions and the following disclaimer. 1025537Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1125537Sdfr * notice, this list of conditions and the following disclaimer in the 1225537Sdfr * documentation and/or other materials provided with the distribution. 1325537Sdfr * 1425537Sdfr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1525537Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1625537Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1725537Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1825537Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1925537Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2025537Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2125537Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2225537Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2325537Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2425537Sdfr * SUCH DAMAGE. 2525537Sdfr * 2650477Speter * $FreeBSD: head/sys/kern/kern_linker.c 100488 2002-07-22 08:28:09Z truckman $ 2725537Sdfr */ 2825537Sdfr 2940159Speter#include "opt_ddb.h" 3040159Speter 3125537Sdfr#include <sys/param.h> 3225537Sdfr#include <sys/kernel.h> 3325537Sdfr#include <sys/systm.h> 3425537Sdfr#include <sys/malloc.h> 3525537Sdfr#include <sys/sysproto.h> 3625537Sdfr#include <sys/sysent.h> 3725537Sdfr#include <sys/proc.h> 3825537Sdfr#include <sys/lock.h> 3982749Sdillon#include <sys/mutex.h> 4092547Sarr#include <sys/sx.h> 4125537Sdfr#include <sys/module.h> 4225537Sdfr#include <sys/linker.h> 4340159Speter#include <sys/fcntl.h> 4440159Speter#include <sys/libkern.h> 4540159Speter#include <sys/namei.h> 4640159Speter#include <sys/vnode.h> 4740159Speter#include <sys/sysctl.h> 4825537Sdfr 4959603Sdfr#include "linker_if.h" 5059603Sdfr 5140961Speter#ifdef KLD_DEBUG 5240961Speterint kld_debug = 0; 5340961Speter#endif 5440961Speter 5591040Sarr/* 5691040Sarr * static char *linker_search_path(const char *name, struct mod_depend 5791040Sarr * *verinfo); 5891040Sarr */ 5991040Sarrstatic const char *linker_basename(const char *path); 6091040Sarrstatic int linker_load_module(const char *kldname, const char *modname, 6191040Sarr struct linker_file *parent, struct mod_depend *verinfo, 6291040Sarr struct linker_file **lfpp); 6359751Speter 6478161Speter/* Metadata from the static kernel */ 6578161SpeterSET_DECLARE(modmetadata_set, struct mod_metadata); 6678161Speter 6759751SpeterMALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 6859751Speter 6940906Speterlinker_file_t linker_kernel_file; 7031324Sbde 7198452Sarrstatic struct mtx kld_mtx; /* kernel linker mutex */ 7298452Sarr 7325537Sdfrstatic linker_class_list_t classes; 7450068Sgrogstatic linker_file_list_t linker_files; 7525537Sdfrstatic int next_file_id = 1; 7698452Sarrstatic int linker_no_more_classes = 0; 7725537Sdfr 7886553Sarr#define LINKER_GET_NEXT_FILE_ID(a) do { \ 7991040Sarr linker_file_t lftmp; \ 8086553Sarr \ 8186553Sarrretry: \ 8298452Sarr mtx_lock(&kld_mtx); \ 8391040Sarr TAILQ_FOREACH(lftmp, &linker_files, link) { \ 8491040Sarr if (next_file_id == lftmp->id) { \ 8591040Sarr next_file_id++; \ 8698452Sarr mtx_unlock(&kld_mtx); \ 8791040Sarr goto retry; \ 8891040Sarr } \ 8991040Sarr } \ 9091040Sarr (a) = next_file_id; \ 9198452Sarr mtx_unlock(&kld_mtx); /* Hold for safe read of id variable */ \ 9286553Sarr} while(0) 9386553Sarr 9486553Sarr 9559751Speter/* XXX wrong name; we're looking at version provision tags here, not modules */ 9660938Sjaketypedef TAILQ_HEAD(, modlist) modlisthead_t; 9759751Speterstruct modlist { 9891040Sarr TAILQ_ENTRY(modlist) link; /* chain together all modules */ 9991040Sarr linker_file_t container; 10091040Sarr const char *name; 10191040Sarr int version; 10259751Speter}; 10391040Sarrtypedef struct modlist *modlist_t; 10491040Sarrstatic modlisthead_t found_modules; 10559751Speter 10694321Sbrianstatic modlist_t modlist_lookup2(const char *name, 10794321Sbrian struct mod_depend *verinfo); 10894321Sbrian 10959603Sdfrstatic char * 11059603Sdfrlinker_strdup(const char *str) 11159603Sdfr{ 11291040Sarr char *result; 11359603Sdfr 11491040Sarr if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 11591040Sarr strcpy(result, str); 11691040Sarr return (result); 11759603Sdfr} 11859603Sdfr 11925537Sdfrstatic void 12091040Sarrlinker_init(void *arg) 12125537Sdfr{ 12291040Sarr 12398452Sarr mtx_init(&kld_mtx, "kernel linker", NULL, MTX_DEF); 12491040Sarr TAILQ_INIT(&classes); 12591040Sarr TAILQ_INIT(&linker_files); 12625537Sdfr} 12725537Sdfr 12891040SarrSYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0) 12925537Sdfr 13098452Sarrstatic void 13198452Sarrlinker_stop_class_add(void *arg) 13298452Sarr{ 13398452Sarr 13498452Sarr linker_no_more_classes = 1; 13598452Sarr} 13698452Sarr 13798452SarrSYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL) 13898452Sarr 13925537Sdfrint 14059603Sdfrlinker_add_class(linker_class_t lc) 14125537Sdfr{ 14291040Sarr 14398452Sarr /* 14498452Sarr * We disallow any class registration passt SI_ORDER_ANY 14598452Sarr * of SI_SUB_KLD. 14698452Sarr */ 14798452Sarr if (linker_no_more_classes == 1) 14898452Sarr return (EPERM); 14991040Sarr kobj_class_compile((kobj_class_t) lc); 15091040Sarr TAILQ_INSERT_TAIL(&classes, lc, link); 15191040Sarr return (0); 15225537Sdfr} 15325537Sdfr 15425537Sdfrstatic void 15525537Sdfrlinker_file_sysinit(linker_file_t lf) 15625537Sdfr{ 15791040Sarr struct sysinit **start, **stop, **sipp, **xipp, *save; 15825537Sdfr 15991040Sarr KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 16091040Sarr lf->filename)); 16125537Sdfr 16291040Sarr if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 16391040Sarr return; 16491040Sarr /* 16591040Sarr * Perform a bubble sort of the system initialization objects by 16691040Sarr * their subsystem (primary key) and order (secondary key). 16791040Sarr * 16891040Sarr * Since some things care about execution order, this is the operation 16991040Sarr * which ensures continued function. 17091040Sarr */ 17191040Sarr for (sipp = start; sipp < stop; sipp++) { 17291040Sarr for (xipp = sipp + 1; xipp < stop; xipp++) { 17391040Sarr if ((*sipp)->subsystem < (*xipp)->subsystem || 17491040Sarr ((*sipp)->subsystem == (*xipp)->subsystem && 17591040Sarr (*sipp)->order <= (*xipp)->order)) 17691040Sarr continue; /* skip */ 17791040Sarr save = *sipp; 17891040Sarr *sipp = *xipp; 17991040Sarr *xipp = save; 18091040Sarr } 18125537Sdfr } 18225537Sdfr 18391040Sarr /* 18491040Sarr * Traverse the (now) ordered list of system initialization tasks. 18591040Sarr * Perform each task, and continue on to the next task. 18691040Sarr */ 18791040Sarr for (sipp = start; sipp < stop; sipp++) { 18891040Sarr if ((*sipp)->subsystem == SI_SUB_DUMMY) 18991040Sarr continue; /* skip dummy task(s) */ 19025537Sdfr 19191040Sarr /* Call function */ 19291040Sarr (*((*sipp)->func)) ((*sipp)->udata); 19391040Sarr } 19425537Sdfr} 19525537Sdfr 19641055Speterstatic void 19741055Speterlinker_file_sysuninit(linker_file_t lf) 19841055Speter{ 19991040Sarr struct sysinit **start, **stop, **sipp, **xipp, *save; 20041055Speter 20191040Sarr KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 20291040Sarr lf->filename)); 20341055Speter 20491068Sarr if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 20591040Sarr NULL) != 0) 20691040Sarr return; 20741055Speter 20891040Sarr /* 20991040Sarr * Perform a reverse bubble sort of the system initialization objects 21091040Sarr * by their subsystem (primary key) and order (secondary key). 21191040Sarr * 21291040Sarr * Since some things care about execution order, this is the operation 21391040Sarr * which ensures continued function. 21491040Sarr */ 21591040Sarr for (sipp = start; sipp < stop; sipp++) { 21691040Sarr for (xipp = sipp + 1; xipp < stop; xipp++) { 21791040Sarr if ((*sipp)->subsystem > (*xipp)->subsystem || 21891040Sarr ((*sipp)->subsystem == (*xipp)->subsystem && 21991040Sarr (*sipp)->order >= (*xipp)->order)) 22091040Sarr continue; /* skip */ 22191040Sarr save = *sipp; 22291040Sarr *sipp = *xipp; 22391040Sarr *xipp = save; 22491040Sarr } 22541055Speter } 22641055Speter 22791040Sarr /* 22891040Sarr * Traverse the (now) ordered list of system initialization tasks. 22991040Sarr * Perform each task, and continue on to the next task. 23091040Sarr */ 23191040Sarr for (sipp = start; sipp < stop; sipp++) { 23291040Sarr if ((*sipp)->subsystem == SI_SUB_DUMMY) 23391040Sarr continue; /* skip dummy task(s) */ 23441055Speter 23591040Sarr /* Call function */ 23691040Sarr (*((*sipp)->func)) ((*sipp)->udata); 23791040Sarr } 23841055Speter} 23941055Speter 24044078Sdfrstatic void 24144078Sdfrlinker_file_register_sysctls(linker_file_t lf) 24244078Sdfr{ 24391040Sarr struct sysctl_oid **start, **stop, **oidp; 24444078Sdfr 24591040Sarr KLD_DPF(FILE, 24691040Sarr ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 24791040Sarr lf->filename)); 24844078Sdfr 24991040Sarr if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 25091040Sarr return; 25144078Sdfr 25291040Sarr for (oidp = start; oidp < stop; oidp++) 25391040Sarr sysctl_register_oid(*oidp); 25444078Sdfr} 25544078Sdfr 25644078Sdfrstatic void 25744078Sdfrlinker_file_unregister_sysctls(linker_file_t lf) 25844078Sdfr{ 25991040Sarr struct sysctl_oid **start, **stop, **oidp; 26044078Sdfr 26191040Sarr KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs" 26291040Sarr " for %s\n", lf->filename)); 26344078Sdfr 26491040Sarr if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 26591040Sarr return; 26644078Sdfr 26791040Sarr for (oidp = start; oidp < stop; oidp++) 26891040Sarr sysctl_unregister_oid(*oidp); 26944078Sdfr} 27044078Sdfr 27159751Speterstatic int 27259751Speterlinker_file_register_modules(linker_file_t lf) 27359751Speter{ 27491040Sarr struct mod_metadata **start, **stop, **mdp; 27591040Sarr const moduledata_t *moddata; 27691040Sarr int error; 27759751Speter 27891040Sarr KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 27991040Sarr " in %s\n", lf->filename)); 28059751Speter 28191068Sarr if (linker_file_lookup_set(lf, "modmetadata_set", &start, 28291040Sarr &stop, 0) != 0) { 28391040Sarr /* 28491040Sarr * This fallback should be unnecessary, but if we get booted 28591040Sarr * from boot2 instead of loader and we are missing our 28691040Sarr * metadata then we have to try the best we can. 28791040Sarr */ 28891040Sarr if (lf == linker_kernel_file) { 28991040Sarr start = SET_BEGIN(modmetadata_set); 29091040Sarr stop = SET_LIMIT(modmetadata_set); 29191040Sarr } else 29291040Sarr return (0); 29378161Speter } 29491040Sarr for (mdp = start; mdp < stop; mdp++) { 29591040Sarr if ((*mdp)->md_type != MDT_MODULE) 29691040Sarr continue; 29791040Sarr moddata = (*mdp)->md_data; 29891040Sarr KLD_DPF(FILE, ("Registering module %s in %s\n", 29991040Sarr moddata->name, lf->filename)); 30091040Sarr error = module_register(moddata, lf); 30191040Sarr if (error) 30291068Sarr printf("Module %s failed to register: %d\n", 30391040Sarr moddata->name, error); 30459751Speter } 30591040Sarr return (0); 30659751Speter} 30759751Speter 30859751Speterstatic void 30959751Speterlinker_init_kernel_modules(void) 31059751Speter{ 31191040Sarr 31291040Sarr linker_file_register_modules(linker_kernel_file); 31359751Speter} 31459751Speter 31591040SarrSYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0) 31659751Speter 31725537Sdfrint 31891040Sarrlinker_load_file(const char *filename, linker_file_t *result) 31925537Sdfr{ 32091040Sarr linker_class_t lc; 32191040Sarr linker_file_t lf; 32291040Sarr int foundfile, error = 0; 32325537Sdfr 32491040Sarr /* Refuse to load modules if securelevel raised */ 32591040Sarr if (securelevel > 0) 32691040Sarr return (EPERM); 32762261Sarchie 32891040Sarr lf = linker_find_file_by_name(filename); 32991040Sarr if (lf) { 33091040Sarr KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 33191040Sarr " incrementing refs\n", filename)); 33291040Sarr *result = lf; 33391040Sarr lf->refs++; 33491040Sarr goto out; 33591040Sarr } 33691040Sarr lf = NULL; 33791040Sarr foundfile = 0; 33898452Sarr 33998452Sarr /* 34098452Sarr * We do not need to protect (lock) classes here because there is 34198452Sarr * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 34298452Sarr * and there is no class deregistration mechanism at this time. 34398452Sarr */ 34491040Sarr TAILQ_FOREACH(lc, &classes, link) { 34591040Sarr KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 34691040Sarr filename)); 34791040Sarr error = LINKER_LOAD_FILE(lc, filename, &lf); 34891040Sarr /* 34991040Sarr * If we got something other than ENOENT, then it exists but 35091040Sarr * we cannot load it for some other reason. 35191040Sarr */ 35291040Sarr if (error != ENOENT) 35391040Sarr foundfile = 1; 35491040Sarr if (lf) { 35591040Sarr linker_file_register_modules(lf); 35691040Sarr linker_file_register_sysctls(lf); 35791040Sarr linker_file_sysinit(lf); 35891040Sarr lf->flags |= LINKER_FILE_LINKED; 35991040Sarr *result = lf; 36091040Sarr error = 0; 36191040Sarr goto out; 36291040Sarr } 36391040Sarr } 36442755Speter /* 36591040Sarr * Less than ideal, but tells the user whether it failed to load or 36691040Sarr * the module was not found. 36742755Speter */ 36891040Sarr if (foundfile) 36991068Sarr /* Format not recognized (or unloadable). */ 37091068Sarr error = ENOEXEC; 37191040Sarr else 37291068Sarr error = ENOENT; /* Nothing found */ 37325537Sdfrout: 37491040Sarr return (error); 37525537Sdfr} 37625537Sdfr 37778413Sbrianint 37894321Sbrianlinker_reference_module(const char *modname, struct mod_depend *verinfo, 37994321Sbrian linker_file_t *result) 38078413Sbrian{ 38194321Sbrian modlist_t mod; 38294321Sbrian 38394321Sbrian if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 38494321Sbrian *result = mod->container; 38594321Sbrian (*result)->refs++; 38694321Sbrian return (0); 38794321Sbrian } 38894321Sbrian 38994321Sbrian return (linker_load_module(NULL, modname, NULL, verinfo, result)); 39078413Sbrian} 39178413Sbrian 39225537Sdfrlinker_file_t 39391040Sarrlinker_find_file_by_name(const char *filename) 39425537Sdfr{ 39591040Sarr linker_file_t lf = 0; 39691040Sarr char *koname; 39725537Sdfr 39891040Sarr koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 39991040Sarr if (koname == NULL) 40091040Sarr goto out; 40191040Sarr sprintf(koname, "%s.ko", filename); 40240861Speter 40398452Sarr mtx_lock(&kld_mtx); 40491040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 40592032Sdwmalone if (strcmp(lf->filename, koname) == 0) 40691040Sarr break; 40792032Sdwmalone if (strcmp(lf->filename, filename) == 0) 40891040Sarr break; 40991040Sarr } 41098452Sarr mtx_unlock(&kld_mtx); 41140861Speterout: 41291040Sarr if (koname) 41391040Sarr free(koname, M_LINKER); 41491040Sarr return (lf); 41525537Sdfr} 41625537Sdfr 41725537Sdfrlinker_file_t 41825537Sdfrlinker_find_file_by_id(int fileid) 41925537Sdfr{ 42091040Sarr linker_file_t lf = 0; 42198452Sarr 42298452Sarr mtx_lock(&kld_mtx); 42391040Sarr TAILQ_FOREACH(lf, &linker_files, link) 42491040Sarr if (lf->id == fileid) 42591040Sarr break; 42698452Sarr mtx_unlock(&kld_mtx); 42791040Sarr return (lf); 42825537Sdfr} 42925537Sdfr 43025537Sdfrlinker_file_t 43191040Sarrlinker_make_file(const char *pathname, linker_class_t lc) 43225537Sdfr{ 43391040Sarr linker_file_t lf; 43491040Sarr const char *filename; 43525537Sdfr 43691040Sarr lf = NULL; 43791040Sarr filename = linker_basename(pathname); 43840159Speter 43991040Sarr KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 44091040Sarr lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 44191040Sarr if (lf == NULL) 44291040Sarr goto out; 44391040Sarr lf->refs = 1; 44491040Sarr lf->userrefs = 0; 44591040Sarr lf->flags = 0; 44691040Sarr lf->filename = linker_strdup(filename); 44791040Sarr LINKER_GET_NEXT_FILE_ID(lf->id); 44891040Sarr lf->ndeps = 0; 44991040Sarr lf->deps = NULL; 45091040Sarr STAILQ_INIT(&lf->common); 45191040Sarr TAILQ_INIT(&lf->modules); 45298452Sarr mtx_lock(&kld_mtx); 45391040Sarr TAILQ_INSERT_TAIL(&linker_files, lf, link); 45498452Sarr mtx_unlock(&kld_mtx); 45525537Sdfrout: 45691040Sarr return (lf); 45725537Sdfr} 45825537Sdfr 45925537Sdfrint 46025537Sdfrlinker_file_unload(linker_file_t file) 46125537Sdfr{ 46291040Sarr module_t mod, next; 46391040Sarr modlist_t ml, nextml; 46491040Sarr struct common_symbol *cp; 46591040Sarr int error, i; 46625537Sdfr 46791040Sarr error = 0; 46862261Sarchie 46991040Sarr /* Refuse to unload modules if securelevel raised. */ 47091040Sarr if (securelevel > 0) 47191040Sarr return (EPERM); 47225537Sdfr 47391040Sarr KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 47491040Sarr if (file->refs == 1) { 47591040Sarr KLD_DPF(FILE, ("linker_file_unload: file is unloading," 47691040Sarr " informing modules\n")); 47791040Sarr 47891040Sarr /* 47991040Sarr * Inform any modules associated with this file. 48091040Sarr */ 48192547Sarr MOD_XLOCK; 48291040Sarr for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 48391040Sarr next = module_getfnext(mod); 48492547Sarr MOD_XUNLOCK; 48591040Sarr 48691040Sarr /* 48791040Sarr * Give the module a chance to veto the unload. 48891040Sarr */ 48991040Sarr if ((error = module_unload(mod)) != 0) { 49091040Sarr KLD_DPF(FILE, ("linker_file_unload: module %x" 49191040Sarr " vetoes unload\n", mod)); 49291040Sarr goto out; 49392547Sarr } else 49492547Sarr MOD_XLOCK; 49591040Sarr module_release(mod); 49691040Sarr } 49792547Sarr MOD_XUNLOCK; 49891040Sarr } 49991040Sarr file->refs--; 50091040Sarr if (file->refs > 0) { 50125537Sdfr goto out; 50291040Sarr } 50391040Sarr for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) { 50491040Sarr nextml = TAILQ_NEXT(ml, link); 50591040Sarr if (ml->container == file) 50691040Sarr TAILQ_REMOVE(&found_modules, ml, link); 50791040Sarr } 50825537Sdfr 50991040Sarr /* 51091040Sarr * Don't try to run SYSUNINITs if we are unloaded due to a 51191040Sarr * link error. 51291040Sarr */ 51391040Sarr if (file->flags & LINKER_FILE_LINKED) { 51491040Sarr linker_file_sysuninit(file); 51591040Sarr linker_file_unregister_sysctls(file); 51625537Sdfr } 51798452Sarr mtx_lock(&kld_mtx); 51891040Sarr TAILQ_REMOVE(&linker_files, file, link); 51998452Sarr mtx_unlock(&kld_mtx); 52025537Sdfr 52191040Sarr if (file->deps) { 52291040Sarr for (i = 0; i < file->ndeps; i++) 52391040Sarr linker_file_unload(file->deps[i]); 52491040Sarr free(file->deps, M_LINKER); 52591040Sarr file->deps = NULL; 52659751Speter } 52791040Sarr for (cp = STAILQ_FIRST(&file->common); cp; 52891068Sarr cp = STAILQ_FIRST(&file->common)) { 52991040Sarr STAILQ_REMOVE(&file->common, cp, common_symbol, link); 53091040Sarr free(cp, M_LINKER); 53191040Sarr } 53259751Speter 53391040Sarr LINKER_UNLOAD(file); 53491040Sarr if (file->filename) { 53591040Sarr free(file->filename, M_LINKER); 53691040Sarr file->filename = NULL; 53791040Sarr } 53891040Sarr kobj_delete((kobj_t) file, M_LINKER); 53925537Sdfrout: 54091040Sarr return (error); 54125537Sdfr} 54225537Sdfr 54325537Sdfrint 54486469Siedowselinker_file_add_dependency(linker_file_t file, linker_file_t dep) 54525537Sdfr{ 54691040Sarr linker_file_t *newdeps; 54725537Sdfr 54891040Sarr newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 54991040Sarr M_LINKER, M_WAITOK | M_ZERO); 55091040Sarr if (newdeps == NULL) 55191040Sarr return (ENOMEM); 55225537Sdfr 55391040Sarr if (file->deps) { 55491040Sarr bcopy(file->deps, newdeps, 55591040Sarr file->ndeps * sizeof(linker_file_t *)); 55691040Sarr free(file->deps, M_LINKER); 55791040Sarr } 55891040Sarr file->deps = newdeps; 55991040Sarr file->deps[file->ndeps] = dep; 56091040Sarr file->ndeps++; 56191040Sarr return (0); 56225537Sdfr} 56325537Sdfr 56478161Speter/* 56591040Sarr * Locate a linker set and its contents. This is a helper function to avoid 56691040Sarr * linker_if.h exposure elsewhere. Note: firstp and lastp are really void *** 56778161Speter */ 56878161Speterint 56978161Speterlinker_file_lookup_set(linker_file_t file, const char *name, 57091040Sarr void *firstp, void *lastp, int *countp) 57178161Speter{ 57278161Speter 57391040Sarr return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 57478161Speter} 57578161Speter 57625537Sdfrcaddr_t 57791040Sarrlinker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 57825537Sdfr{ 57991040Sarr c_linker_sym_t sym; 58091040Sarr linker_symval_t symval; 58191040Sarr caddr_t address; 58291040Sarr size_t common_size = 0; 58392032Sdwmalone int i; 58425537Sdfr 58591040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n", 58691040Sarr file, name, deps)); 58725537Sdfr 58891040Sarr if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 58991040Sarr LINKER_SYMBOL_VALUES(file, sym, &symval); 59091040Sarr if (symval.value == 0) 59191040Sarr /* 59291040Sarr * For commons, first look them up in the 59391040Sarr * dependencies and only allocate space if not found 59491040Sarr * there. 59591040Sarr */ 59691040Sarr common_size = symval.size; 59791040Sarr else { 59891040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 59991040Sarr ".value=%x\n", symval.value)); 60091040Sarr return (symval.value); 60191040Sarr } 60240159Speter } 60391040Sarr if (deps) { 60491040Sarr for (i = 0; i < file->ndeps; i++) { 60591040Sarr address = linker_file_lookup_symbol(file->deps[i], 60691040Sarr name, 0); 60791040Sarr if (address) { 60891040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol:" 60991040Sarr " deps value=%x\n", address)); 61091040Sarr return (address); 61191040Sarr } 61291040Sarr } 61325537Sdfr } 61491040Sarr if (common_size > 0) { 61591040Sarr /* 61691040Sarr * This is a common symbol which was not found in the 61791040Sarr * dependencies. We maintain a simple common symbol table in 61891040Sarr * the file object. 61991040Sarr */ 62091040Sarr struct common_symbol *cp; 62142849Speter 62291040Sarr STAILQ_FOREACH(cp, &file->common, link) { 62392032Sdwmalone if (strcmp(cp->name, name) == 0) { 62491040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol:" 62591040Sarr " old common value=%x\n", cp->address)); 62691040Sarr return (cp->address); 62791040Sarr } 62891040Sarr } 62991040Sarr /* 63091040Sarr * Round the symbol size up to align. 63191040Sarr */ 63291040Sarr common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 63391040Sarr cp = malloc(sizeof(struct common_symbol) 63491040Sarr + common_size + strlen(name) + 1, M_LINKER, 63591040Sarr M_WAITOK | M_ZERO); 63691040Sarr if (cp == NULL) { 63791040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 63891040Sarr return (0); 63991040Sarr } 64091040Sarr cp->address = (caddr_t)(cp + 1); 64191040Sarr cp->name = cp->address + common_size; 64291040Sarr strcpy(cp->name, name); 64391040Sarr bzero(cp->address, common_size); 64491040Sarr STAILQ_INSERT_TAIL(&file->common, cp, link); 64525537Sdfr 64691040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 64791040Sarr " value=%x\n", cp->address)); 64891040Sarr return (cp->address); 64940159Speter } 65091040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 65191040Sarr return (0); 65225537Sdfr} 65325537Sdfr 65440159Speter#ifdef DDB 65525537Sdfr/* 65691040Sarr * DDB Helpers. DDB has to look across multiple files with their own symbol 65791040Sarr * tables and string tables. 65891040Sarr * 65991040Sarr * Note that we do not obey list locking protocols here. We really don't need 66091040Sarr * DDB to hang because somebody's got the lock held. We'll take the chance 66191040Sarr * that the files list is inconsistant instead. 66240159Speter */ 66340159Speter 66440159Speterint 66543309Sdillonlinker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 66640159Speter{ 66791040Sarr linker_file_t lf; 66840159Speter 66991040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 67091040Sarr if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 67191040Sarr return (0); 67291040Sarr } 67391040Sarr return (ENOENT); 67440159Speter} 67540159Speter 67640159Speterint 67743309Sdillonlinker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 67840159Speter{ 67991040Sarr linker_file_t lf; 68091040Sarr c_linker_sym_t best, es; 68191040Sarr u_long diff, bestdiff, off; 68240159Speter 68391040Sarr best = 0; 68491040Sarr off = (uintptr_t)value; 68591040Sarr bestdiff = off; 68691040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 68791040Sarr if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 68891040Sarr continue; 68991040Sarr if (es != 0 && diff < bestdiff) { 69091040Sarr best = es; 69191040Sarr bestdiff = diff; 69291040Sarr } 69391040Sarr if (bestdiff == 0) 69491040Sarr break; 69540159Speter } 69691040Sarr if (best) { 69791040Sarr *sym = best; 69891040Sarr *diffp = bestdiff; 69991040Sarr return (0); 70091040Sarr } else { 70191040Sarr *sym = 0; 70291040Sarr *diffp = off; 70391040Sarr return (ENOENT); 70491040Sarr } 70540159Speter} 70640159Speter 70740159Speterint 70843309Sdillonlinker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 70940159Speter{ 71091040Sarr linker_file_t lf; 71140159Speter 71291040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 71391040Sarr if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 71491040Sarr return (0); 71591040Sarr } 71691040Sarr return (ENOENT); 71740159Speter} 71840159Speter#endif 71940159Speter 72040159Speter/* 72125537Sdfr * Syscalls. 72225537Sdfr */ 72382749Sdillon/* 72482749Sdillon * MPSAFE 72582749Sdillon */ 72625537Sdfrint 72791040Sarrkldload(struct thread *td, struct kldload_args *uap) 72825537Sdfr{ 72991040Sarr char *kldname, *modname; 73091040Sarr char *pathname = NULL; 73191040Sarr linker_file_t lf; 73291040Sarr int error = 0; 73325537Sdfr 73491040Sarr td->td_retval[0] = -1; 73525537Sdfr 73691040Sarr mtx_lock(&Giant); 73782749Sdillon 73893159Sarr if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 73993159Sarr goto out; 74093159Sarr 74193593Sjhb if ((error = suser(td)) != 0) 74291040Sarr goto out; 74325537Sdfr 74491040Sarr pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 74591040Sarr if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 74691040Sarr NULL)) != 0) 74791040Sarr goto out; 74825537Sdfr 74991040Sarr /* 75091040Sarr * If path do not contain qualified name or any dot in it 75191040Sarr * (kldname.ko, or kldname.ver.ko) treat it as interface 75291040Sarr * name. 75391040Sarr */ 75491040Sarr if (index(pathname, '/') || index(pathname, '.')) { 75591040Sarr kldname = pathname; 75691040Sarr modname = NULL; 75791040Sarr } else { 75891040Sarr kldname = NULL; 75991040Sarr modname = pathname; 76091040Sarr } 76191040Sarr error = linker_load_module(kldname, modname, NULL, NULL, &lf); 76291040Sarr if (error) 76391040Sarr goto out; 76442316Smsmith 76591040Sarr lf->userrefs++; 76691040Sarr td->td_retval[0] = lf->id; 76725537Sdfrout: 76891040Sarr if (pathname) 76991040Sarr free(pathname, M_TEMP); 77091040Sarr mtx_unlock(&Giant); 77191040Sarr return (error); 77225537Sdfr} 77325537Sdfr 77482749Sdillon/* 77582749Sdillon * MPSAFE 77682749Sdillon */ 77725537Sdfrint 77891040Sarrkldunload(struct thread *td, struct kldunload_args *uap) 77925537Sdfr{ 78091040Sarr linker_file_t lf; 78191040Sarr int error = 0; 78225537Sdfr 78391040Sarr mtx_lock(&Giant); 78482749Sdillon 78593159Sarr if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 78693159Sarr goto out; 78793159Sarr 78893593Sjhb if ((error = suser(td)) != 0) 78991040Sarr goto out; 79025537Sdfr 79191040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 79291040Sarr if (lf) { 79391040Sarr KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 79491040Sarr if (lf->userrefs == 0) { 79591040Sarr printf("kldunload: attempt to unload file that was" 79691040Sarr " loaded by the kernel\n"); 79791040Sarr error = EBUSY; 79891040Sarr goto out; 79991040Sarr } 80091068Sarr lf->userrefs--; 80191040Sarr error = linker_file_unload(lf); 80291040Sarr if (error) 80391040Sarr lf->userrefs++; 80491040Sarr } else 80591040Sarr error = ENOENT; 80625537Sdfrout: 80791068Sarr mtx_unlock(&Giant); 80891068Sarr return (error); 80925537Sdfr} 81025537Sdfr 81182749Sdillon/* 81282749Sdillon * MPSAFE 81382749Sdillon */ 81425537Sdfrint 81591040Sarrkldfind(struct thread *td, struct kldfind_args *uap) 81625537Sdfr{ 81791040Sarr char *pathname; 81891040Sarr const char *filename; 81991040Sarr linker_file_t lf; 82091040Sarr int error = 0; 82125537Sdfr 82291040Sarr mtx_lock(&Giant); 82391040Sarr td->td_retval[0] = -1; 82482749Sdillon 82591040Sarr pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 82691040Sarr if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 82791040Sarr NULL)) != 0) 82891040Sarr goto out; 82925537Sdfr 83091040Sarr filename = linker_basename(pathname); 83191040Sarr lf = linker_find_file_by_name(filename); 83291040Sarr if (lf) 83391040Sarr td->td_retval[0] = lf->id; 83491040Sarr else 83591040Sarr error = ENOENT; 83625537Sdfrout: 83791040Sarr if (pathname) 83891040Sarr free(pathname, M_TEMP); 83991040Sarr mtx_unlock(&Giant); 84091040Sarr return (error); 84125537Sdfr} 84225537Sdfr 84382749Sdillon/* 84482749Sdillon * MPSAFE 84582749Sdillon */ 84625537Sdfrint 84791040Sarrkldnext(struct thread *td, struct kldnext_args *uap) 84825537Sdfr{ 84991040Sarr linker_file_t lf; 85091040Sarr int error = 0; 85125537Sdfr 85291040Sarr mtx_lock(&Giant); 85382749Sdillon 85491040Sarr if (SCARG(uap, fileid) == 0) { 85598452Sarr mtx_lock(&kld_mtx); 85691040Sarr if (TAILQ_FIRST(&linker_files)) 85791040Sarr td->td_retval[0] = TAILQ_FIRST(&linker_files)->id; 85891040Sarr else 85991040Sarr td->td_retval[0] = 0; 86098452Sarr mtx_unlock(&kld_mtx); 86191040Sarr goto out; 86291040Sarr } 86391040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 86491040Sarr if (lf) { 86591040Sarr if (TAILQ_NEXT(lf, link)) 86691040Sarr td->td_retval[0] = TAILQ_NEXT(lf, link)->id; 86791040Sarr else 86891040Sarr td->td_retval[0] = 0; 86991040Sarr } else 87091040Sarr error = ENOENT; 87182749Sdillonout: 87291040Sarr mtx_unlock(&Giant); 87391040Sarr return (error); 87425537Sdfr} 87525537Sdfr 87682749Sdillon/* 87782749Sdillon * MPSAFE 87882749Sdillon */ 87925537Sdfrint 88091040Sarrkldstat(struct thread *td, struct kldstat_args *uap) 88125537Sdfr{ 88291040Sarr linker_file_t lf; 88391040Sarr int error = 0; 88491040Sarr int namelen, version; 88591040Sarr struct kld_file_stat *stat; 88625537Sdfr 88791040Sarr mtx_lock(&Giant); 88882749Sdillon 88991040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 89091040Sarr if (lf == NULL) { 89191040Sarr error = ENOENT; 89291040Sarr goto out; 89391040Sarr } 89491040Sarr stat = SCARG(uap, stat); 89525537Sdfr 89691040Sarr /* 89791040Sarr * Check the version of the user's structure. 89891040Sarr */ 89991040Sarr if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 90091040Sarr goto out; 90191040Sarr if (version != sizeof(struct kld_file_stat)) { 90291040Sarr error = EINVAL; 90391040Sarr goto out; 90491040Sarr } 90591040Sarr namelen = strlen(lf->filename) + 1; 90691040Sarr if (namelen > MAXPATHLEN) 90791040Sarr namelen = MAXPATHLEN; 90891040Sarr if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 90991040Sarr goto out; 91091040Sarr if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 91191040Sarr goto out; 91291040Sarr if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 91391040Sarr goto out; 91491040Sarr if ((error = copyout(&lf->address, &stat->address, 91591040Sarr sizeof(caddr_t))) != 0) 91691040Sarr goto out; 91791040Sarr if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 91891040Sarr goto out; 91925537Sdfr 92091040Sarr td->td_retval[0] = 0; 92125537Sdfrout: 92291040Sarr mtx_unlock(&Giant); 92391040Sarr return (error); 92425537Sdfr} 92525537Sdfr 92682749Sdillon/* 92782749Sdillon * MPSAFE 92882749Sdillon */ 92925537Sdfrint 93091040Sarrkldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 93125537Sdfr{ 93291040Sarr linker_file_t lf; 93391040Sarr module_t mp; 93491040Sarr int error = 0; 93525537Sdfr 93691040Sarr mtx_lock(&Giant); 93791040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 93891040Sarr if (lf) { 93992547Sarr MOD_SLOCK; 94091040Sarr mp = TAILQ_FIRST(&lf->modules); 94191040Sarr if (mp != NULL) 94291040Sarr td->td_retval[0] = module_getid(mp); 94391040Sarr else 94491040Sarr td->td_retval[0] = 0; 94592547Sarr MOD_SUNLOCK; 94691040Sarr } else 94791040Sarr error = ENOENT; 94891040Sarr mtx_unlock(&Giant); 94991040Sarr return (error); 95025537Sdfr} 95140159Speter 95282749Sdillon/* 95382749Sdillon * MPSAFE 95482749Sdillon */ 95541090Speterint 95683366Sjuliankldsym(struct thread *td, struct kldsym_args *uap) 95741090Speter{ 95891040Sarr char *symstr = NULL; 95991040Sarr c_linker_sym_t sym; 96091040Sarr linker_symval_t symval; 96191040Sarr linker_file_t lf; 96291040Sarr struct kld_sym_lookup lookup; 96391040Sarr int error = 0; 96441090Speter 96591040Sarr mtx_lock(&Giant); 96682749Sdillon 96791040Sarr if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0) 96891040Sarr goto out; 96991068Sarr if (lookup.version != sizeof(lookup) || 97091040Sarr SCARG(uap, cmd) != KLDSYM_LOOKUP) { 97191040Sarr error = EINVAL; 97291040Sarr goto out; 97391040Sarr } 97491040Sarr symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 97591040Sarr if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 97691040Sarr goto out; 97791040Sarr if (SCARG(uap, fileid) != 0) { 97891040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 97991040Sarr if (lf == NULL) { 98091040Sarr error = ENOENT; 98191040Sarr goto out; 98291040Sarr } 98391040Sarr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 98491040Sarr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 98591040Sarr lookup.symvalue = (uintptr_t) symval.value; 98691040Sarr lookup.symsize = symval.size; 98791040Sarr error = copyout(&lookup, SCARG(uap, data), 98891040Sarr sizeof(lookup)); 98991040Sarr } else 99091040Sarr error = ENOENT; 99191040Sarr } else { 99298452Sarr mtx_lock(&kld_mtx); 99391040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 99491040Sarr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 99591040Sarr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 99691040Sarr lookup.symvalue = (uintptr_t)symval.value; 99791040Sarr lookup.symsize = symval.size; 99891040Sarr error = copyout(&lookup, SCARG(uap, data), 99991040Sarr sizeof(lookup)); 100091068Sarr break; 100191040Sarr } 100291040Sarr } 100398452Sarr mtx_unlock(&kld_mtx); 100491040Sarr if (lf == NULL) 100591040Sarr error = ENOENT; 100641090Speter } 100741090Speterout: 100891040Sarr if (symstr) 100991040Sarr free(symstr, M_TEMP); 101091040Sarr mtx_unlock(&Giant); 101191040Sarr return (error); 101241090Speter} 101341090Speter 101440159Speter/* 101540159Speter * Preloaded module support 101640159Speter */ 101740159Speter 101859751Speterstatic modlist_t 101974642Sbpmodlist_lookup(const char *name, int ver) 102059751Speter{ 102191040Sarr modlist_t mod; 102259751Speter 102391040Sarr TAILQ_FOREACH(mod, &found_modules, link) { 102492032Sdwmalone if (strcmp(mod->name, name) == 0 && 102592032Sdwmalone (ver == 0 || mod->version == ver)) 102691040Sarr return (mod); 102791040Sarr } 102891040Sarr return (NULL); 102959751Speter} 103059751Speter 103174642Sbpstatic modlist_t 103283321Spetermodlist_lookup2(const char *name, struct mod_depend *verinfo) 103383321Speter{ 103491040Sarr modlist_t mod, bestmod; 103592032Sdwmalone int ver; 103683321Speter 103791040Sarr if (verinfo == NULL) 103891040Sarr return (modlist_lookup(name, 0)); 103991040Sarr bestmod = NULL; 104091040Sarr for (mod = TAILQ_FIRST(&found_modules); mod; 104191040Sarr mod = TAILQ_NEXT(mod, link)) { 104292032Sdwmalone if (strcmp(mod->name, name) != 0) 104391040Sarr continue; 104491040Sarr ver = mod->version; 104591040Sarr if (ver == verinfo->md_ver_preferred) 104691040Sarr return (mod); 104791040Sarr if (ver >= verinfo->md_ver_minimum && 104891068Sarr ver <= verinfo->md_ver_maximum && 104991068Sarr ver > bestmod->version) 105091040Sarr bestmod = mod; 105191040Sarr } 105291040Sarr return (bestmod); 105383321Speter} 105483321Speter 105583321Speterstatic modlist_t 105678501Sdesmodlist_newmodule(const char *modname, int version, linker_file_t container) 105774642Sbp{ 105891040Sarr modlist_t mod; 105974642Sbp 106092705Sarr mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 106191040Sarr if (mod == NULL) 106291040Sarr panic("no memory for module list"); 106391040Sarr mod->container = container; 106491040Sarr mod->name = modname; 106591040Sarr mod->version = version; 106691040Sarr TAILQ_INSERT_TAIL(&found_modules, mod, link); 106791040Sarr return (mod); 106874642Sbp} 106974642Sbp 107059751Speter/* 107159751Speter * This routine is cheap and nasty but will work for data pointers. 107259751Speter */ 107359751Speterstatic void * 107478501Sdeslinker_reloc_ptr(linker_file_t lf, const void *offset) 107559751Speter{ 107691040Sarr return (lf->address + (uintptr_t)offset); 107759751Speter} 107859751Speter 107974642Sbp/* 108074642Sbp * Dereference MDT_VERSION metadata into module name and version 108174642Sbp */ 108240159Speterstatic void 108374642Sbplinker_mdt_version(linker_file_t lf, struct mod_metadata *mp, 108491040Sarr const char **modname, int *version) 108574642Sbp{ 108691040Sarr struct mod_version *mvp; 108774642Sbp 108891040Sarr if (modname) 108991040Sarr *modname = linker_reloc_ptr(lf, mp->md_cval); 109091040Sarr if (version) { 109191040Sarr mvp = linker_reloc_ptr(lf, mp->md_data); 109291040Sarr *version = mvp->mv_version; 109391040Sarr } 109474642Sbp} 109574642Sbp 109674642Sbp/* 109774642Sbp * Dereference MDT_DEPEND metadata into module name and mod_depend structure 109874642Sbp */ 109974642Sbpstatic void 110074642Sbplinker_mdt_depend(linker_file_t lf, struct mod_metadata *mp, 110191040Sarr const char **modname, struct mod_depend **verinfo) 110274642Sbp{ 110374642Sbp 110491040Sarr if (modname) 110591040Sarr *modname = linker_reloc_ptr(lf, mp->md_cval); 110691040Sarr if (verinfo) 110791040Sarr *verinfo = linker_reloc_ptr(lf, mp->md_data); 110874642Sbp} 110974642Sbp 111074642Sbpstatic void 111178161Speterlinker_addmodules(linker_file_t lf, struct mod_metadata **start, 111291040Sarr struct mod_metadata **stop, int preload) 111374642Sbp{ 111491040Sarr struct mod_metadata *mp, **mdp; 111591040Sarr const char *modname; 111691040Sarr int ver; 111774642Sbp 111891040Sarr for (mdp = start; mdp < stop; mdp++) { 111991040Sarr if (preload) 112091040Sarr mp = *mdp; 112191040Sarr else 112291040Sarr mp = linker_reloc_ptr(lf, *mdp); 112391040Sarr if (mp->md_type != MDT_VERSION) 112491040Sarr continue; 112591040Sarr if (preload) { 112691040Sarr modname = mp->md_cval; 112791040Sarr ver = ((struct mod_version *)mp->md_data)->mv_version; 112891040Sarr } else 112991040Sarr linker_mdt_version(lf, mp, &modname, &ver); 113091040Sarr if (modlist_lookup(modname, ver) != NULL) { 113191040Sarr printf("module %s already present!\n", modname); 113291040Sarr /* XXX what can we do? this is a build error. :-( */ 113391040Sarr continue; 113491040Sarr } 113591040Sarr modlist_newmodule(modname, ver, lf); 113674642Sbp } 113774642Sbp} 113874642Sbp 113974642Sbpstatic void 114091040Sarrlinker_preload(void *arg) 114140159Speter{ 114291040Sarr caddr_t modptr; 114391040Sarr const char *modname, *nmodname; 114491040Sarr char *modtype; 114591040Sarr linker_file_t lf; 114691040Sarr linker_class_t lc; 114792032Sdwmalone int error; 114891040Sarr linker_file_list_t loaded_files; 114991040Sarr linker_file_list_t depended_files; 115091040Sarr struct mod_metadata *mp, *nmp; 115191040Sarr struct mod_metadata **start, **stop, **mdp, **nmdp; 115291040Sarr struct mod_depend *verinfo; 115391040Sarr int nver; 115491040Sarr int resolves; 115591040Sarr modlist_t mod; 115691040Sarr struct sysinit **si_start, **si_stop; 115740159Speter 115891040Sarr TAILQ_INIT(&loaded_files); 115991040Sarr TAILQ_INIT(&depended_files); 116091040Sarr TAILQ_INIT(&found_modules); 116191040Sarr error = 0; 116259751Speter 116391040Sarr modptr = NULL; 116491040Sarr while ((modptr = preload_search_next_name(modptr)) != NULL) { 116591040Sarr modname = (char *)preload_search_info(modptr, MODINFO_NAME); 116691040Sarr modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 116791040Sarr if (modname == NULL) { 116891040Sarr printf("Preloaded module at %p does not have a" 116991040Sarr " name!\n", modptr); 117091040Sarr continue; 117191040Sarr } 117291040Sarr if (modtype == NULL) { 117391040Sarr printf("Preloaded module at %p does not have a type!\n", 117491040Sarr modptr); 117591040Sarr continue; 117691040Sarr } 117791040Sarr printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 117891040Sarr modptr); 117940159Speter lf = NULL; 118091040Sarr TAILQ_FOREACH(lc, &classes, link) { 118191040Sarr error = LINKER_LINK_PRELOAD(lc, modname, &lf); 118291040Sarr if (error) { 118391040Sarr lf = NULL; 118491040Sarr break; 118591040Sarr } 118691040Sarr } 118791040Sarr if (lf) 118891040Sarr TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 118940159Speter } 119040159Speter 119191040Sarr /* 119291040Sarr * First get a list of stuff in the kernel. 119391040Sarr */ 119491040Sarr if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 119591040Sarr &stop, NULL) == 0) 119691040Sarr linker_addmodules(linker_kernel_file, start, stop, 1); 119759751Speter 119859751Speter /* 119991040Sarr * this is a once-off kinky bubble sort resolve relocation dependency 120091040Sarr * requirements 120159751Speter */ 120291040Sarrrestart: 120391040Sarr TAILQ_FOREACH(lf, &loaded_files, loaded) { 120491040Sarr error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 120591040Sarr &stop, NULL); 120691040Sarr /* 120791040Sarr * First, look to see if we would successfully link with this 120891040Sarr * stuff. 120991040Sarr */ 121091040Sarr resolves = 1; /* unless we know otherwise */ 121191040Sarr if (!error) { 121291040Sarr for (mdp = start; mdp < stop; mdp++) { 121391040Sarr mp = linker_reloc_ptr(lf, *mdp); 121491040Sarr if (mp->md_type != MDT_DEPEND) 121591040Sarr continue; 121691040Sarr linker_mdt_depend(lf, mp, &modname, &verinfo); 121791040Sarr for (nmdp = start; nmdp < stop; nmdp++) { 121891040Sarr nmp = linker_reloc_ptr(lf, *nmdp); 121991040Sarr if (nmp->md_type != MDT_VERSION) 122091040Sarr continue; 122191040Sarr linker_mdt_version(lf, nmp, &nmodname, 122291040Sarr NULL); 122391040Sarr nmodname = linker_reloc_ptr(lf, 122491040Sarr nmp->md_cval); 122592032Sdwmalone if (strcmp(modname, nmodname) == 0) 122691040Sarr break; 122791040Sarr } 122891040Sarr if (nmdp < stop) /* it's a self reference */ 122991040Sarr continue; 123091040Sarr 123191040Sarr /* 123291040Sarr * ok, the module isn't here yet, we 123391040Sarr * are not finished 123491040Sarr */ 123591068Sarr if (modlist_lookup2(modname, verinfo) == NULL) 123691040Sarr resolves = 0; 123791040Sarr } 123864143Speter } 123991040Sarr /* 124091040Sarr * OK, if we found our modules, we can link. So, "provide" 124191040Sarr * the modules inside and add it to the end of the link order 124291040Sarr * list. 124391040Sarr */ 124491040Sarr if (resolves) { 124591040Sarr if (!error) { 124691040Sarr for (mdp = start; mdp < stop; mdp++) { 124791040Sarr mp = linker_reloc_ptr(lf, *mdp); 124891040Sarr if (mp->md_type != MDT_VERSION) 124991040Sarr continue; 125091040Sarr linker_mdt_version(lf, mp, 125191040Sarr &modname, &nver); 125291040Sarr if (modlist_lookup(modname, 125391040Sarr nver) != NULL) { 125491040Sarr printf("module %s already" 125591040Sarr " present!\n", modname); 125691040Sarr linker_file_unload(lf); 125791040Sarr TAILQ_REMOVE(&loaded_files, 125891040Sarr lf, loaded); 125991040Sarr /* we changed tailq next ptr */ 126091068Sarr goto restart; 126191040Sarr } 126291040Sarr modlist_newmodule(modname, nver, lf); 126391040Sarr } 126491040Sarr } 126591040Sarr TAILQ_REMOVE(&loaded_files, lf, loaded); 126691040Sarr TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 126791040Sarr /* 126891040Sarr * Since we provided modules, we need to restart the 126991040Sarr * sort so that the previous files that depend on us 127091040Sarr * have a chance. Also, we've busted the tailq next 127191040Sarr * pointer with the REMOVE. 127291040Sarr */ 127391040Sarr goto restart; 127459751Speter } 127559751Speter } 127691040Sarr 127759751Speter /* 127891040Sarr * At this point, we check to see what could not be resolved.. 127959751Speter */ 128091040Sarr TAILQ_FOREACH(lf, &loaded_files, loaded) { 128191040Sarr printf("KLD file %s is missing dependencies\n", lf->filename); 128291040Sarr linker_file_unload(lf); 128391040Sarr TAILQ_REMOVE(&loaded_files, lf, loaded); 128440159Speter } 128559751Speter 128678161Speter /* 128791040Sarr * We made it. Finish off the linking in the order we determined. 128878161Speter */ 128991040Sarr TAILQ_FOREACH(lf, &depended_files, loaded) { 129091040Sarr if (linker_kernel_file) { 129191040Sarr linker_kernel_file->refs++; 129291040Sarr error = linker_file_add_dependency(lf, 129391040Sarr linker_kernel_file); 129491040Sarr if (error) 129591040Sarr panic("cannot add dependency"); 129691040Sarr } 129791040Sarr lf->userrefs++; /* so we can (try to) kldunload it */ 129891040Sarr error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 129991040Sarr &stop, NULL); 130091040Sarr if (!error) { 130191040Sarr for (mdp = start; mdp < stop; mdp++) { 130291040Sarr mp = linker_reloc_ptr(lf, *mdp); 130391040Sarr if (mp->md_type != MDT_DEPEND) 130491040Sarr continue; 130591040Sarr linker_mdt_depend(lf, mp, &modname, &verinfo); 130691040Sarr mod = modlist_lookup2(modname, verinfo); 130791040Sarr mod->container->refs++; 130891040Sarr error = linker_file_add_dependency(lf, 130991040Sarr mod->container); 131091040Sarr if (error) 131191040Sarr panic("cannot add dependency"); 131291040Sarr } 131391040Sarr } 131491040Sarr /* 131591040Sarr * Now do relocation etc using the symbol search paths 131691040Sarr * established by the dependencies 131791040Sarr */ 131891040Sarr error = LINKER_LINK_PRELOAD_FINISH(lf); 131991040Sarr if (error) { 132091040Sarr printf("KLD file %s - could not finalize loading\n", 132191040Sarr lf->filename); 132291040Sarr linker_file_unload(lf); 132391040Sarr continue; 132491040Sarr } 132591040Sarr linker_file_register_modules(lf); 132691040Sarr if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 132791040Sarr &si_stop, NULL) == 0) 132891040Sarr sysinit_add(si_start, si_stop); 132991040Sarr linker_file_register_sysctls(lf); 133091040Sarr lf->flags |= LINKER_FILE_LINKED; 133159751Speter } 133291040Sarr /* woohoo! we made it! */ 133340159Speter} 133440159Speter 133591040SarrSYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0) 133640159Speter 133740159Speter/* 133840159Speter * Search for a not-loaded module by name. 133991040Sarr * 134040159Speter * Modules may be found in the following locations: 134191040Sarr * 134291040Sarr * - preloaded (result is just the module name) - on disk (result is full path 134391040Sarr * to module) 134491040Sarr * 134591040Sarr * If the module name is qualified in any way (contains path, etc.) the we 134691040Sarr * simply return a copy of it. 134791040Sarr * 134840159Speter * The search path can be manipulated via sysctl. Note that we use the ';' 134940159Speter * character as a separator to be consistent with the bootloader. 135040159Speter */ 135140159Speter 135283321Speterstatic char linker_hintfile[] = "linker.hints"; 135383358Speterstatic char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules;/modules"; 135440159Speter 135540159SpeterSYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 135691040Sarr sizeof(linker_path), "module load search path"); 135740159Speter 135877843SpeterTUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 135970417Speter 136059751Speterstatic char *linker_ext_list[] = { 136183321Speter "", 136259751Speter ".ko", 136359751Speter NULL 136459751Speter}; 136559751Speter 136683321Speter/* 136791040Sarr * Check if file actually exists either with or without extension listed in 136891040Sarr * the linker_ext_list. (probably should be generic for the rest of the 136991040Sarr * kernel) 137083321Speter */ 137159751Speterstatic char * 137291040Sarrlinker_lookup_file(const char *path, int pathlen, const char *name, 137391040Sarr int namelen, struct vattr *vap) 137440159Speter{ 137591040Sarr struct nameidata nd; 137691040Sarr struct thread *td = curthread; /* XXX */ 137791040Sarr char *result, **cpp, *sep; 137891040Sarr int error, len, extlen, reclen, flags; 137991040Sarr enum vtype type; 138040159Speter 138191040Sarr extlen = 0; 138291040Sarr for (cpp = linker_ext_list; *cpp; cpp++) { 138391040Sarr len = strlen(*cpp); 138491040Sarr if (len > extlen) 138591040Sarr extlen = len; 138691040Sarr } 138791040Sarr extlen++; /* trailing '\0' */ 138891040Sarr sep = (path[pathlen - 1] != '/') ? "/" : ""; 138983321Speter 139091040Sarr reclen = pathlen + strlen(sep) + namelen + extlen + 1; 139191040Sarr result = malloc(reclen, M_LINKER, M_WAITOK); 139291040Sarr for (cpp = linker_ext_list; *cpp; cpp++) { 139391040Sarr snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 139491040Sarr namelen, name, *cpp); 139591040Sarr /* 139691040Sarr * Attempt to open the file, and return the path if 139791040Sarr * we succeed and it's a regular file. 139891040Sarr */ 139991040Sarr NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 140091040Sarr flags = FREAD; 140191040Sarr error = vn_open(&nd, &flags, 0); 140291040Sarr if (error == 0) { 140391040Sarr NDFREE(&nd, NDF_ONLY_PNBUF); 140491040Sarr type = nd.ni_vp->v_type; 140591040Sarr if (vap) 140691406Sjhb VOP_GETATTR(nd.ni_vp, vap, td->td_ucred, td); 140791040Sarr VOP_UNLOCK(nd.ni_vp, 0, td); 140891406Sjhb vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 140991040Sarr if (type == VREG) 141091040Sarr return (result); 141191040Sarr } 141283321Speter } 141391040Sarr free(result, M_LINKER); 141491040Sarr return (NULL); 141583321Speter} 141683321Speter 141791040Sarr#define INT_ALIGN(base, ptr) ptr = \ 141883321Speter (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 141983321Speter 142083321Speter/* 142191040Sarr * Lookup KLD which contains requested module in the "linker.hints" file. If 142291040Sarr * version specification is available, then try to find the best KLD. 142383321Speter * Otherwise just find the latest one. 142483321Speter */ 142583321Speterstatic char * 142691040Sarrlinker_hints_lookup(const char *path, int pathlen, const char *modname, 142791040Sarr int modnamelen, struct mod_depend *verinfo) 142883321Speter{ 142991040Sarr struct thread *td = curthread; /* XXX */ 143091406Sjhb struct ucred *cred = td ? td->td_ucred : NULL; 143191040Sarr struct nameidata nd; 143291040Sarr struct vattr vattr, mattr; 143391040Sarr u_char *hints = NULL; 143491040Sarr u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 143591040Sarr int error, ival, bestver, *intp, reclen, found, flags, clen, blen; 143683321Speter 143791040Sarr result = NULL; 143891040Sarr bestver = found = 0; 143983321Speter 144091040Sarr sep = (path[pathlen - 1] != '/') ? "/" : ""; 144191040Sarr reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 144291040Sarr strlen(sep) + 1; 144391040Sarr pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 144491040Sarr snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 144591040Sarr linker_hintfile); 144683321Speter 144791040Sarr NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 144891040Sarr flags = FREAD; 144991040Sarr error = vn_open(&nd, &flags, 0); 145091040Sarr if (error) 145191040Sarr goto bad; 145291040Sarr NDFREE(&nd, NDF_ONLY_PNBUF); 145391040Sarr if (nd.ni_vp->v_type != VREG) 145491040Sarr goto bad; 145591040Sarr best = cp = NULL; 145691040Sarr error = VOP_GETATTR(nd.ni_vp, &vattr, cred, td); 145791040Sarr if (error) 145891040Sarr goto bad; 145991040Sarr /* 146091040Sarr * XXX: we need to limit this number to some reasonable value 146191040Sarr */ 146291040Sarr if (vattr.va_size > 100 * 1024) { 146391040Sarr printf("hints file too large %ld\n", (long)vattr.va_size); 146491040Sarr goto bad; 146591040Sarr } 146691040Sarr hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 146791040Sarr if (hints == NULL) 146891040Sarr goto bad; 146991068Sarr error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 147091040Sarr UIO_SYSSPACE, IO_NODELOCKED, cred, &reclen, td); 147191040Sarr if (error) 147291040Sarr goto bad; 147399553Sjeff VOP_UNLOCK(nd.ni_vp, 0, td); 147491040Sarr vn_close(nd.ni_vp, FREAD, cred, td); 147591040Sarr nd.ni_vp = NULL; 147691040Sarr if (reclen != 0) { 147791040Sarr printf("can't read %d\n", reclen); 147891040Sarr goto bad; 147991040Sarr } 148091040Sarr intp = (int *)hints; 148183321Speter ival = *intp++; 148291040Sarr if (ival != LINKER_HINTS_VERSION) { 148391040Sarr printf("hints file version mismatch %d\n", ival); 148491040Sarr goto bad; 148583321Speter } 148691040Sarr bufend = hints + vattr.va_size; 148791040Sarr recptr = (u_char *)intp; 148891040Sarr clen = blen = 0; 148991040Sarr while (recptr < bufend && !found) { 149091040Sarr intp = (int *)recptr; 149191040Sarr reclen = *intp++; 149291040Sarr ival = *intp++; 149391040Sarr cp = (char *)intp; 149491040Sarr switch (ival) { 149591040Sarr case MDT_VERSION: 149691040Sarr clen = *cp++; 149791040Sarr if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 149891040Sarr break; 149991040Sarr cp += clen; 150091040Sarr INT_ALIGN(hints, cp); 150191040Sarr ival = *(int *)cp; 150291040Sarr cp += sizeof(int); 150391040Sarr clen = *cp++; 150491040Sarr if (verinfo == NULL || 150591040Sarr ival == verinfo->md_ver_preferred) { 150691040Sarr found = 1; 150791040Sarr break; 150891040Sarr } 150991040Sarr if (ival >= verinfo->md_ver_minimum && 151091040Sarr ival <= verinfo->md_ver_maximum && 151191040Sarr ival > bestver) { 151291040Sarr bestver = ival; 151391040Sarr best = cp; 151491040Sarr blen = clen; 151591040Sarr } 151691040Sarr break; 151791040Sarr default: 151891040Sarr break; 151991040Sarr } 152091040Sarr recptr += reclen + sizeof(int); 152191040Sarr } 152283321Speter /* 152391040Sarr * Finally check if KLD is in the place 152483321Speter */ 152591040Sarr if (found) 152691040Sarr result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 152791040Sarr else if (best) 152891040Sarr result = linker_lookup_file(path, pathlen, best, blen, &mattr); 152991040Sarr 153091040Sarr /* 153191040Sarr * KLD is newer than hints file. What we should do now? 153291040Sarr */ 153391040Sarr if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 153491040Sarr printf("warning: KLD '%s' is newer than the linker.hints" 153591040Sarr " file\n", result); 153683321Speterbad: 153791040Sarr if (hints) 153891040Sarr free(hints, M_TEMP); 153999553Sjeff if (nd.ni_vp != NULL) { 154099553Sjeff VOP_UNLOCK(nd.ni_vp, 0, td); 154191040Sarr vn_close(nd.ni_vp, FREAD, cred, td); 154299553Sjeff } 154391040Sarr /* 154491040Sarr * If nothing found or hints is absent - fallback to the old 154591040Sarr * way by using "kldname[.ko]" as module name. 154691040Sarr */ 154791040Sarr if (!found && !bestver && result == NULL) 154891040Sarr result = linker_lookup_file(path, pathlen, modname, 154991040Sarr modnamelen, NULL); 155091040Sarr return (result); 155183321Speter} 155283321Speter 155383321Speter/* 155483321Speter * Lookup KLD which contains requested module in the all directories. 155583321Speter */ 155683321Speterstatic char * 155783321Speterlinker_search_module(const char *modname, int modnamelen, 155891040Sarr struct mod_depend *verinfo) 155983321Speter{ 156091040Sarr char *cp, *ep, *result; 156183321Speter 156291040Sarr /* 156391040Sarr * traverse the linker path 156491040Sarr */ 156591040Sarr for (cp = linker_path; *cp; cp = ep + 1) { 156691040Sarr /* find the end of this component */ 156791040Sarr for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 156891068Sarr result = linker_hints_lookup(cp, ep - cp, modname, 156991068Sarr modnamelen, verinfo); 157091040Sarr if (result != NULL) 157191040Sarr return (result); 157291040Sarr if (*ep == 0) 157391040Sarr break; 157491040Sarr } 157591040Sarr return (NULL); 157683321Speter} 157783321Speter 157883321Speter/* 157983321Speter * Search for module in all directories listed in the linker_path. 158083321Speter */ 158183321Speterstatic char * 158283321Speterlinker_search_kld(const char *name) 158383321Speter{ 158491040Sarr char *cp, *ep, *result, **cpp; 158591040Sarr int extlen, len; 158683321Speter 158791040Sarr /* qualified at all? */ 158891040Sarr if (index(name, '/')) 158991040Sarr return (linker_strdup(name)); 159040159Speter 159191040Sarr extlen = 0; 159291040Sarr for (cpp = linker_ext_list; *cpp; cpp++) { 159391040Sarr len = strlen(*cpp); 159491040Sarr if (len > extlen) 159591040Sarr extlen = len; 159691040Sarr } 159791040Sarr extlen++; /* trailing '\0' */ 159859751Speter 159991040Sarr /* traverse the linker path */ 160091040Sarr len = strlen(name); 160191040Sarr for (ep = linker_path; *ep; ep++) { 160291040Sarr cp = ep; 160391040Sarr /* find the end of this component */ 160491040Sarr for (; *ep != 0 && *ep != ';'; ep++); 160591040Sarr result = linker_lookup_file(cp, ep - cp, name, len, NULL); 160691040Sarr if (result != NULL) 160791040Sarr return (result); 160891040Sarr } 160991040Sarr return (NULL); 161040159Speter} 161159751Speter 161259751Speterstatic const char * 161391040Sarrlinker_basename(const char *path) 161459751Speter{ 161591040Sarr const char *filename; 161659751Speter 161791040Sarr filename = rindex(path, '/'); 161891040Sarr if (filename == NULL) 161991040Sarr return path; 162091040Sarr if (filename[1]) 162191040Sarr filename++; 162291040Sarr return (filename); 162359751Speter} 162459751Speter 162559751Speter/* 162691040Sarr * Find a file which contains given module and load it, if "parent" is not 162791040Sarr * NULL, register a reference to it. 162859751Speter */ 162959751Speterstatic int 163083321Speterlinker_load_module(const char *kldname, const char *modname, 163191040Sarr struct linker_file *parent, struct mod_depend *verinfo, 163291040Sarr struct linker_file **lfpp) 163359751Speter{ 163491040Sarr linker_file_t lfdep; 163591040Sarr const char *filename; 163691040Sarr char *pathname; 163791040Sarr int error; 163859751Speter 163991040Sarr if (modname == NULL) { 164091040Sarr /* 164191040Sarr * We have to load KLD 164291040Sarr */ 164391068Sarr KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 164491068Sarr " is not NULL")); 164591040Sarr pathname = linker_search_kld(kldname); 164691040Sarr } else { 164791040Sarr if (modlist_lookup2(modname, verinfo) != NULL) 164891040Sarr return (EEXIST); 164994322Sbrian if (kldname != NULL) 165094322Sbrian pathname = linker_strdup(kldname); 165195488Sbrian else if (rootvnode == NULL) 165294322Sbrian pathname = NULL; 165394322Sbrian else 165491040Sarr /* 165591040Sarr * Need to find a KLD with required module 165691040Sarr */ 165791040Sarr pathname = linker_search_module(modname, 165891040Sarr strlen(modname), verinfo); 165991040Sarr } 166091040Sarr if (pathname == NULL) 166191040Sarr return (ENOENT); 166291040Sarr 166383321Speter /* 166491040Sarr * Can't load more than one file with the same basename XXX: 166591040Sarr * Actually it should be possible to have multiple KLDs with 166691040Sarr * the same basename but different path because they can 166791040Sarr * provide different versions of the same modules. 166883321Speter */ 166991040Sarr filename = linker_basename(pathname); 167091040Sarr if (linker_find_file_by_name(filename)) { 167191040Sarr error = EEXIST; 167291040Sarr goto out; 167383321Speter } 167491040Sarr do { 167591040Sarr error = linker_load_file(pathname, &lfdep); 167691040Sarr if (error) 167791040Sarr break; 167891040Sarr if (modname && verinfo && 167991040Sarr modlist_lookup2(modname, verinfo) == NULL) { 168091040Sarr linker_file_unload(lfdep); 168191040Sarr error = ENOENT; 168291040Sarr break; 168391040Sarr } 168491040Sarr if (parent) { 168591040Sarr error = linker_file_add_dependency(parent, lfdep); 168691040Sarr if (error) 168791040Sarr break; 168891040Sarr } 168991040Sarr if (lfpp) 169091040Sarr *lfpp = lfdep; 169191040Sarr } while (0); 169259751Speterout: 169391040Sarr if (pathname) 169491040Sarr free(pathname, M_LINKER); 169591040Sarr return (error); 169659751Speter} 169759751Speter 169859751Speter/* 169991040Sarr * This routine is responsible for finding dependencies of userland initiated 170091040Sarr * kldload(2)'s of files. 170159751Speter */ 170259751Speterint 170386469Siedowselinker_load_dependencies(linker_file_t lf) 170459751Speter{ 170591040Sarr linker_file_t lfdep; 170691040Sarr struct mod_metadata **start, **stop, **mdp, **nmdp; 170791040Sarr struct mod_metadata *mp, *nmp; 170891040Sarr struct mod_depend *verinfo; 170991040Sarr modlist_t mod; 171091040Sarr const char *modname, *nmodname; 171192032Sdwmalone int ver, error = 0, count; 171259751Speter 171391040Sarr /* 171491040Sarr * All files are dependant on /kernel. 171591040Sarr */ 171691040Sarr if (linker_kernel_file) { 171791040Sarr linker_kernel_file->refs++; 171891040Sarr error = linker_file_add_dependency(lf, linker_kernel_file); 171991040Sarr if (error) 172091040Sarr return (error); 172159751Speter } 172291040Sarr if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 172391040Sarr &count) != 0) 172491040Sarr return (0); 172591040Sarr for (mdp = start; mdp < stop; mdp++) { 172691040Sarr mp = linker_reloc_ptr(lf, *mdp); 172791040Sarr if (mp->md_type != MDT_VERSION) 172891040Sarr continue; 172991040Sarr linker_mdt_version(lf, mp, &modname, &ver); 173091040Sarr mod = modlist_lookup(modname, ver); 173191040Sarr if (mod != NULL) { 173291040Sarr printf("interface %s.%d already present in the KLD" 173391040Sarr " '%s'!\n", modname, ver, 173491040Sarr mod->container->filename); 173591040Sarr return (EEXIST); 173691040Sarr } 173791040Sarr } 173874642Sbp 173991040Sarr for (mdp = start; mdp < stop; mdp++) { 174091040Sarr mp = linker_reloc_ptr(lf, *mdp); 174191040Sarr if (mp->md_type != MDT_DEPEND) 174291040Sarr continue; 174391040Sarr linker_mdt_depend(lf, mp, &modname, &verinfo); 174491040Sarr nmodname = NULL; 174591040Sarr for (nmdp = start; nmdp < stop; nmdp++) { 174691040Sarr nmp = linker_reloc_ptr(lf, *nmdp); 174791040Sarr if (nmp->md_type != MDT_VERSION) 174891040Sarr continue; 174991040Sarr nmodname = linker_reloc_ptr(lf, nmp->md_cval); 175092032Sdwmalone if (strcmp(modname, nmodname) == 0) 175191040Sarr break; 175291040Sarr } 175391040Sarr if (nmdp < stop)/* early exit, it's a self reference */ 175491040Sarr continue; 175591040Sarr mod = modlist_lookup2(modname, verinfo); 175691040Sarr if (mod) { /* woohoo, it's loaded already */ 175791040Sarr lfdep = mod->container; 175891040Sarr lfdep->refs++; 175991040Sarr error = linker_file_add_dependency(lf, lfdep); 176091040Sarr if (error) 176191040Sarr break; 176291040Sarr continue; 176391040Sarr } 176491040Sarr error = linker_load_module(NULL, modname, lf, verinfo, NULL); 176591040Sarr if (error) { 176691040Sarr printf("KLD %s: depends on %s - not available\n", 176791040Sarr lf->filename, modname); 176891040Sarr break; 176991040Sarr } 177059751Speter } 177159751Speter 177291040Sarr if (error) 177391040Sarr return (error); 177491040Sarr linker_addmodules(lf, start, stop, 0); 177591040Sarr return (error); 177659751Speter} 177785736Sgreen 177885736Sgreenstatic int 177985736Sgreensysctl_kern_function_list_iterate(const char *name, void *opaque) 178085736Sgreen{ 178185736Sgreen struct sysctl_req *req; 178285736Sgreen 178385736Sgreen req = opaque; 178485736Sgreen return (SYSCTL_OUT(req, name, strlen(name) + 1)); 178585736Sgreen} 178685736Sgreen 178785736Sgreen/* 178885736Sgreen * Export a nul-separated, double-nul-terminated list of all function names 178985736Sgreen * in the kernel. 179085736Sgreen */ 179185736Sgreenstatic int 179285736Sgreensysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 179385736Sgreen{ 179485736Sgreen linker_file_t lf; 179585736Sgreen int error; 179685736Sgreen 1797100488Struckman sysctl_wire_old_buffer(req, 0); 179898452Sarr mtx_lock(&kld_mtx); 179985736Sgreen TAILQ_FOREACH(lf, &linker_files, link) { 180085736Sgreen error = LINKER_EACH_FUNCTION_NAME(lf, 180185736Sgreen sysctl_kern_function_list_iterate, req); 180298452Sarr if (error) { 180398452Sarr mtx_unlock(&kld_mtx); 180485736Sgreen return (error); 180598452Sarr } 180685736Sgreen } 180798452Sarr mtx_unlock(&kld_mtx); 180885736Sgreen return (SYSCTL_OUT(req, "", 1)); 180985736Sgreen} 181085736Sgreen 181185736SgreenSYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD, 181291040Sarr NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 1813