kern_linker.c revision 105167
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 105167 2002-10-15 18:58:38Z phk $ 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); 6059751Speter 6178161Speter/* Metadata from the static kernel */ 6278161SpeterSET_DECLARE(modmetadata_set, struct mod_metadata); 6378161Speter 6459751SpeterMALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 6559751Speter 6640906Speterlinker_file_t linker_kernel_file; 6731324Sbde 6898452Sarrstatic struct mtx kld_mtx; /* kernel linker mutex */ 6998452Sarr 7025537Sdfrstatic linker_class_list_t classes; 7150068Sgrogstatic linker_file_list_t linker_files; 7225537Sdfrstatic int next_file_id = 1; 7398452Sarrstatic int linker_no_more_classes = 0; 7425537Sdfr 7586553Sarr#define LINKER_GET_NEXT_FILE_ID(a) do { \ 7691040Sarr linker_file_t lftmp; \ 7786553Sarr \ 7886553Sarrretry: \ 7998452Sarr mtx_lock(&kld_mtx); \ 8091040Sarr TAILQ_FOREACH(lftmp, &linker_files, link) { \ 8191040Sarr if (next_file_id == lftmp->id) { \ 8291040Sarr next_file_id++; \ 8398452Sarr mtx_unlock(&kld_mtx); \ 8491040Sarr goto retry; \ 8591040Sarr } \ 8691040Sarr } \ 8791040Sarr (a) = next_file_id; \ 8898452Sarr mtx_unlock(&kld_mtx); /* Hold for safe read of id variable */ \ 8986553Sarr} while(0) 9086553Sarr 9186553Sarr 9259751Speter/* XXX wrong name; we're looking at version provision tags here, not modules */ 9360938Sjaketypedef TAILQ_HEAD(, modlist) modlisthead_t; 9459751Speterstruct modlist { 9591040Sarr TAILQ_ENTRY(modlist) link; /* chain together all modules */ 9691040Sarr linker_file_t container; 9791040Sarr const char *name; 9891040Sarr int version; 9959751Speter}; 10091040Sarrtypedef struct modlist *modlist_t; 10191040Sarrstatic modlisthead_t found_modules; 10259751Speter 10394321Sbrianstatic modlist_t modlist_lookup2(const char *name, 10494321Sbrian struct mod_depend *verinfo); 10594321Sbrian 10659603Sdfrstatic char * 10759603Sdfrlinker_strdup(const char *str) 10859603Sdfr{ 10991040Sarr char *result; 11059603Sdfr 11191040Sarr if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 11291040Sarr strcpy(result, str); 11391040Sarr return (result); 11459603Sdfr} 11559603Sdfr 11625537Sdfrstatic void 11791040Sarrlinker_init(void *arg) 11825537Sdfr{ 11991040Sarr 12098452Sarr mtx_init(&kld_mtx, "kernel linker", NULL, MTX_DEF); 12191040Sarr TAILQ_INIT(&classes); 12291040Sarr TAILQ_INIT(&linker_files); 12325537Sdfr} 12425537Sdfr 12591040SarrSYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0) 12625537Sdfr 12798452Sarrstatic void 12898452Sarrlinker_stop_class_add(void *arg) 12998452Sarr{ 13098452Sarr 13198452Sarr linker_no_more_classes = 1; 13298452Sarr} 13398452Sarr 13498452SarrSYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL) 13598452Sarr 13625537Sdfrint 13759603Sdfrlinker_add_class(linker_class_t lc) 13825537Sdfr{ 13991040Sarr 14098452Sarr /* 14198452Sarr * We disallow any class registration passt SI_ORDER_ANY 14298452Sarr * of SI_SUB_KLD. 14398452Sarr */ 14498452Sarr if (linker_no_more_classes == 1) 14598452Sarr return (EPERM); 14691040Sarr kobj_class_compile((kobj_class_t) lc); 14791040Sarr TAILQ_INSERT_TAIL(&classes, lc, link); 14891040Sarr return (0); 14925537Sdfr} 15025537Sdfr 15125537Sdfrstatic void 15225537Sdfrlinker_file_sysinit(linker_file_t lf) 15325537Sdfr{ 15491040Sarr struct sysinit **start, **stop, **sipp, **xipp, *save; 15525537Sdfr 15691040Sarr KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 15791040Sarr lf->filename)); 15825537Sdfr 15991040Sarr if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0) 16091040Sarr return; 16191040Sarr /* 16291040Sarr * Perform a bubble sort of the system initialization objects by 16391040Sarr * their subsystem (primary key) and order (secondary key). 16491040Sarr * 16591040Sarr * Since some things care about execution order, this is the operation 16691040Sarr * which ensures continued function. 16791040Sarr */ 16891040Sarr for (sipp = start; sipp < stop; sipp++) { 16991040Sarr for (xipp = sipp + 1; xipp < stop; xipp++) { 17091040Sarr if ((*sipp)->subsystem < (*xipp)->subsystem || 17191040Sarr ((*sipp)->subsystem == (*xipp)->subsystem && 17291040Sarr (*sipp)->order <= (*xipp)->order)) 17391040Sarr continue; /* skip */ 17491040Sarr save = *sipp; 17591040Sarr *sipp = *xipp; 17691040Sarr *xipp = save; 17791040Sarr } 17825537Sdfr } 17925537Sdfr 18091040Sarr /* 18191040Sarr * Traverse the (now) ordered list of system initialization tasks. 18291040Sarr * Perform each task, and continue on to the next task. 18391040Sarr */ 18491040Sarr for (sipp = start; sipp < stop; sipp++) { 18591040Sarr if ((*sipp)->subsystem == SI_SUB_DUMMY) 18691040Sarr continue; /* skip dummy task(s) */ 18725537Sdfr 18891040Sarr /* Call function */ 18991040Sarr (*((*sipp)->func)) ((*sipp)->udata); 19091040Sarr } 19125537Sdfr} 19225537Sdfr 19341055Speterstatic void 19441055Speterlinker_file_sysuninit(linker_file_t lf) 19541055Speter{ 19691040Sarr struct sysinit **start, **stop, **sipp, **xipp, *save; 19741055Speter 19891040Sarr KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 19991040Sarr lf->filename)); 20041055Speter 20191068Sarr if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop, 20291040Sarr NULL) != 0) 20391040Sarr return; 20441055Speter 20591040Sarr /* 20691040Sarr * Perform a reverse bubble sort of the system initialization objects 20791040Sarr * by their subsystem (primary key) and order (secondary key). 20891040Sarr * 20991040Sarr * Since some things care about execution order, this is the operation 21091040Sarr * which ensures continued function. 21191040Sarr */ 21291040Sarr for (sipp = start; sipp < stop; sipp++) { 21391040Sarr for (xipp = sipp + 1; xipp < stop; xipp++) { 21491040Sarr if ((*sipp)->subsystem > (*xipp)->subsystem || 21591040Sarr ((*sipp)->subsystem == (*xipp)->subsystem && 21691040Sarr (*sipp)->order >= (*xipp)->order)) 21791040Sarr continue; /* skip */ 21891040Sarr save = *sipp; 21991040Sarr *sipp = *xipp; 22091040Sarr *xipp = save; 22191040Sarr } 22241055Speter } 22341055Speter 22491040Sarr /* 22591040Sarr * Traverse the (now) ordered list of system initialization tasks. 22691040Sarr * Perform each task, and continue on to the next task. 22791040Sarr */ 22891040Sarr for (sipp = start; sipp < stop; sipp++) { 22991040Sarr if ((*sipp)->subsystem == SI_SUB_DUMMY) 23091040Sarr continue; /* skip dummy task(s) */ 23141055Speter 23291040Sarr /* Call function */ 23391040Sarr (*((*sipp)->func)) ((*sipp)->udata); 23491040Sarr } 23541055Speter} 23641055Speter 23744078Sdfrstatic void 23844078Sdfrlinker_file_register_sysctls(linker_file_t lf) 23944078Sdfr{ 24091040Sarr struct sysctl_oid **start, **stop, **oidp; 24144078Sdfr 24291040Sarr KLD_DPF(FILE, 24391040Sarr ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 24491040Sarr lf->filename)); 24544078Sdfr 24691040Sarr if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 24791040Sarr return; 24844078Sdfr 24991040Sarr for (oidp = start; oidp < stop; oidp++) 25091040Sarr sysctl_register_oid(*oidp); 25144078Sdfr} 25244078Sdfr 25344078Sdfrstatic void 25444078Sdfrlinker_file_unregister_sysctls(linker_file_t lf) 25544078Sdfr{ 25691040Sarr struct sysctl_oid **start, **stop, **oidp; 25744078Sdfr 25891040Sarr KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs" 25991040Sarr " for %s\n", lf->filename)); 26044078Sdfr 26191040Sarr if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0) 26291040Sarr return; 26344078Sdfr 26491040Sarr for (oidp = start; oidp < stop; oidp++) 26591040Sarr sysctl_unregister_oid(*oidp); 26644078Sdfr} 26744078Sdfr 26859751Speterstatic int 26959751Speterlinker_file_register_modules(linker_file_t lf) 27059751Speter{ 27191040Sarr struct mod_metadata **start, **stop, **mdp; 27291040Sarr const moduledata_t *moddata; 27391040Sarr int error; 27459751Speter 27591040Sarr KLD_DPF(FILE, ("linker_file_register_modules: registering modules" 27691040Sarr " in %s\n", lf->filename)); 27759751Speter 27891068Sarr if (linker_file_lookup_set(lf, "modmetadata_set", &start, 27991040Sarr &stop, 0) != 0) { 28091040Sarr /* 28191040Sarr * This fallback should be unnecessary, but if we get booted 28291040Sarr * from boot2 instead of loader and we are missing our 28391040Sarr * metadata then we have to try the best we can. 28491040Sarr */ 28591040Sarr if (lf == linker_kernel_file) { 28691040Sarr start = SET_BEGIN(modmetadata_set); 28791040Sarr stop = SET_LIMIT(modmetadata_set); 28891040Sarr } else 28991040Sarr return (0); 29078161Speter } 29191040Sarr for (mdp = start; mdp < stop; mdp++) { 29291040Sarr if ((*mdp)->md_type != MDT_MODULE) 29391040Sarr continue; 29491040Sarr moddata = (*mdp)->md_data; 29591040Sarr KLD_DPF(FILE, ("Registering module %s in %s\n", 29691040Sarr moddata->name, lf->filename)); 29791040Sarr error = module_register(moddata, lf); 29891040Sarr if (error) 29991068Sarr printf("Module %s failed to register: %d\n", 30091040Sarr moddata->name, error); 30159751Speter } 30291040Sarr return (0); 30359751Speter} 30459751Speter 30559751Speterstatic void 30659751Speterlinker_init_kernel_modules(void) 30759751Speter{ 30891040Sarr 30991040Sarr linker_file_register_modules(linker_kernel_file); 31059751Speter} 31159751Speter 31291040SarrSYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0) 31359751Speter 314101241Smuxstatic int 31591040Sarrlinker_load_file(const char *filename, linker_file_t *result) 31625537Sdfr{ 31791040Sarr linker_class_t lc; 31891040Sarr linker_file_t lf; 31991040Sarr int foundfile, error = 0; 32025537Sdfr 32191040Sarr /* Refuse to load modules if securelevel raised */ 32291040Sarr if (securelevel > 0) 32391040Sarr return (EPERM); 32462261Sarchie 32591040Sarr lf = linker_find_file_by_name(filename); 32691040Sarr if (lf) { 32791040Sarr KLD_DPF(FILE, ("linker_load_file: file %s is already loaded," 32891040Sarr " incrementing refs\n", filename)); 32991040Sarr *result = lf; 33091040Sarr lf->refs++; 33191040Sarr goto out; 33291040Sarr } 33391040Sarr lf = NULL; 33491040Sarr foundfile = 0; 33598452Sarr 33698452Sarr /* 33798452Sarr * We do not need to protect (lock) classes here because there is 33898452Sarr * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY) 33998452Sarr * and there is no class deregistration mechanism at this time. 34098452Sarr */ 34191040Sarr TAILQ_FOREACH(lc, &classes, link) { 34291040Sarr KLD_DPF(FILE, ("linker_load_file: trying to load %s\n", 34391040Sarr filename)); 34491040Sarr error = LINKER_LOAD_FILE(lc, filename, &lf); 34591040Sarr /* 34691040Sarr * If we got something other than ENOENT, then it exists but 34791040Sarr * we cannot load it for some other reason. 34891040Sarr */ 34991040Sarr if (error != ENOENT) 35091040Sarr foundfile = 1; 35191040Sarr if (lf) { 35291040Sarr linker_file_register_modules(lf); 35391040Sarr linker_file_register_sysctls(lf); 35491040Sarr linker_file_sysinit(lf); 35591040Sarr lf->flags |= LINKER_FILE_LINKED; 35691040Sarr *result = lf; 35791040Sarr error = 0; 35891040Sarr goto out; 35991040Sarr } 36091040Sarr } 36142755Speter /* 36291040Sarr * Less than ideal, but tells the user whether it failed to load or 36391040Sarr * the module was not found. 36442755Speter */ 36591040Sarr if (foundfile) 36691068Sarr /* Format not recognized (or unloadable). */ 36791068Sarr error = ENOEXEC; 36891040Sarr else 36991068Sarr error = ENOENT; /* Nothing found */ 37025537Sdfrout: 37191040Sarr return (error); 37225537Sdfr} 37325537Sdfr 37478413Sbrianint 37594321Sbrianlinker_reference_module(const char *modname, struct mod_depend *verinfo, 37694321Sbrian linker_file_t *result) 37778413Sbrian{ 37894321Sbrian modlist_t mod; 37994321Sbrian 38094321Sbrian if ((mod = modlist_lookup2(modname, verinfo)) != NULL) { 38194321Sbrian *result = mod->container; 38294321Sbrian (*result)->refs++; 38394321Sbrian return (0); 38494321Sbrian } 38594321Sbrian 38694321Sbrian return (linker_load_module(NULL, modname, NULL, verinfo, result)); 38778413Sbrian} 38878413Sbrian 38925537Sdfrlinker_file_t 39091040Sarrlinker_find_file_by_name(const char *filename) 39125537Sdfr{ 39291040Sarr linker_file_t lf = 0; 39391040Sarr char *koname; 39425537Sdfr 39591040Sarr koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 39691040Sarr if (koname == NULL) 39791040Sarr goto out; 39891040Sarr sprintf(koname, "%s.ko", filename); 39940861Speter 40098452Sarr mtx_lock(&kld_mtx); 40191040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 40292032Sdwmalone if (strcmp(lf->filename, koname) == 0) 40391040Sarr break; 40492032Sdwmalone if (strcmp(lf->filename, filename) == 0) 40591040Sarr break; 40691040Sarr } 40798452Sarr mtx_unlock(&kld_mtx); 40840861Speterout: 40991040Sarr if (koname) 41091040Sarr free(koname, M_LINKER); 41191040Sarr return (lf); 41225537Sdfr} 41325537Sdfr 41425537Sdfrlinker_file_t 41525537Sdfrlinker_find_file_by_id(int fileid) 41625537Sdfr{ 41791040Sarr linker_file_t lf = 0; 41898452Sarr 41998452Sarr mtx_lock(&kld_mtx); 42091040Sarr TAILQ_FOREACH(lf, &linker_files, link) 42191040Sarr if (lf->id == fileid) 42291040Sarr break; 42398452Sarr mtx_unlock(&kld_mtx); 42491040Sarr return (lf); 42525537Sdfr} 42625537Sdfr 42725537Sdfrlinker_file_t 42891040Sarrlinker_make_file(const char *pathname, linker_class_t lc) 42925537Sdfr{ 43091040Sarr linker_file_t lf; 43191040Sarr const char *filename; 43225537Sdfr 43391040Sarr lf = NULL; 43491040Sarr filename = linker_basename(pathname); 43540159Speter 43691040Sarr KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 43791040Sarr lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK); 43891040Sarr if (lf == NULL) 43991040Sarr goto out; 44091040Sarr lf->refs = 1; 44191040Sarr lf->userrefs = 0; 44291040Sarr lf->flags = 0; 44391040Sarr lf->filename = linker_strdup(filename); 44491040Sarr LINKER_GET_NEXT_FILE_ID(lf->id); 44591040Sarr lf->ndeps = 0; 44691040Sarr lf->deps = NULL; 44791040Sarr STAILQ_INIT(&lf->common); 44891040Sarr TAILQ_INIT(&lf->modules); 44998452Sarr mtx_lock(&kld_mtx); 45091040Sarr TAILQ_INSERT_TAIL(&linker_files, lf, link); 45198452Sarr mtx_unlock(&kld_mtx); 45225537Sdfrout: 45391040Sarr return (lf); 45425537Sdfr} 45525537Sdfr 45625537Sdfrint 45725537Sdfrlinker_file_unload(linker_file_t file) 45825537Sdfr{ 45991040Sarr module_t mod, next; 46091040Sarr modlist_t ml, nextml; 46191040Sarr struct common_symbol *cp; 46291040Sarr int error, i; 46325537Sdfr 46491040Sarr error = 0; 46562261Sarchie 46691040Sarr /* Refuse to unload modules if securelevel raised. */ 46791040Sarr if (securelevel > 0) 46891040Sarr return (EPERM); 46925537Sdfr 47091040Sarr KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 47191040Sarr if (file->refs == 1) { 47291040Sarr KLD_DPF(FILE, ("linker_file_unload: file is unloading," 47391040Sarr " informing modules\n")); 47491040Sarr 47591040Sarr /* 47691040Sarr * Inform any modules associated with this file. 47791040Sarr */ 47892547Sarr MOD_XLOCK; 47991040Sarr for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 48091040Sarr next = module_getfnext(mod); 48192547Sarr MOD_XUNLOCK; 48291040Sarr 48391040Sarr /* 48491040Sarr * Give the module a chance to veto the unload. 48591040Sarr */ 48691040Sarr if ((error = module_unload(mod)) != 0) { 48791040Sarr KLD_DPF(FILE, ("linker_file_unload: module %x" 48891040Sarr " vetoes unload\n", mod)); 48991040Sarr goto out; 49092547Sarr } else 49192547Sarr MOD_XLOCK; 49291040Sarr module_release(mod); 49391040Sarr } 49492547Sarr MOD_XUNLOCK; 49591040Sarr } 49691040Sarr file->refs--; 49791040Sarr if (file->refs > 0) { 49825537Sdfr goto out; 49991040Sarr } 50091040Sarr for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) { 50191040Sarr nextml = TAILQ_NEXT(ml, link); 50291040Sarr if (ml->container == file) 50391040Sarr TAILQ_REMOVE(&found_modules, ml, link); 50491040Sarr } 50525537Sdfr 50691040Sarr /* 50791040Sarr * Don't try to run SYSUNINITs if we are unloaded due to a 50891040Sarr * link error. 50991040Sarr */ 51091040Sarr if (file->flags & LINKER_FILE_LINKED) { 51191040Sarr linker_file_sysuninit(file); 51291040Sarr linker_file_unregister_sysctls(file); 51325537Sdfr } 51498452Sarr mtx_lock(&kld_mtx); 51591040Sarr TAILQ_REMOVE(&linker_files, file, link); 51698452Sarr mtx_unlock(&kld_mtx); 51725537Sdfr 51891040Sarr if (file->deps) { 51991040Sarr for (i = 0; i < file->ndeps; i++) 52091040Sarr linker_file_unload(file->deps[i]); 52191040Sarr free(file->deps, M_LINKER); 52291040Sarr file->deps = NULL; 52359751Speter } 52491040Sarr for (cp = STAILQ_FIRST(&file->common); cp; 52591068Sarr cp = STAILQ_FIRST(&file->common)) { 52691040Sarr STAILQ_REMOVE(&file->common, cp, common_symbol, link); 52791040Sarr free(cp, M_LINKER); 52891040Sarr } 52959751Speter 53091040Sarr LINKER_UNLOAD(file); 53191040Sarr if (file->filename) { 53291040Sarr free(file->filename, M_LINKER); 53391040Sarr file->filename = NULL; 53491040Sarr } 53591040Sarr kobj_delete((kobj_t) file, M_LINKER); 53625537Sdfrout: 53791040Sarr return (error); 53825537Sdfr} 53925537Sdfr 54025537Sdfrint 54186469Siedowselinker_file_add_dependency(linker_file_t file, linker_file_t dep) 54225537Sdfr{ 54391040Sarr linker_file_t *newdeps; 54425537Sdfr 54591040Sarr newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *), 54691040Sarr M_LINKER, M_WAITOK | M_ZERO); 54791040Sarr if (newdeps == NULL) 54891040Sarr return (ENOMEM); 54925537Sdfr 55091040Sarr if (file->deps) { 55191040Sarr bcopy(file->deps, newdeps, 55291040Sarr file->ndeps * sizeof(linker_file_t *)); 55391040Sarr free(file->deps, M_LINKER); 55491040Sarr } 55591040Sarr file->deps = newdeps; 55691040Sarr file->deps[file->ndeps] = dep; 55791040Sarr file->ndeps++; 55891040Sarr return (0); 55925537Sdfr} 56025537Sdfr 56178161Speter/* 56291040Sarr * Locate a linker set and its contents. This is a helper function to avoid 56391040Sarr * linker_if.h exposure elsewhere. Note: firstp and lastp are really void *** 56478161Speter */ 56578161Speterint 56678161Speterlinker_file_lookup_set(linker_file_t file, const char *name, 56791040Sarr void *firstp, void *lastp, int *countp) 56878161Speter{ 56978161Speter 57091040Sarr return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp)); 57178161Speter} 57278161Speter 57325537Sdfrcaddr_t 57491040Sarrlinker_file_lookup_symbol(linker_file_t file, const char *name, int deps) 57525537Sdfr{ 57691040Sarr c_linker_sym_t sym; 57791040Sarr linker_symval_t symval; 57891040Sarr caddr_t address; 57991040Sarr size_t common_size = 0; 58092032Sdwmalone int i; 58125537Sdfr 58291040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n", 58391040Sarr file, name, deps)); 58425537Sdfr 58591040Sarr if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 58691040Sarr LINKER_SYMBOL_VALUES(file, sym, &symval); 58791040Sarr if (symval.value == 0) 58891040Sarr /* 58991040Sarr * For commons, first look them up in the 59091040Sarr * dependencies and only allocate space if not found 59191040Sarr * there. 59291040Sarr */ 59391040Sarr common_size = symval.size; 59491040Sarr else { 59591040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol" 59691040Sarr ".value=%x\n", symval.value)); 59791040Sarr return (symval.value); 59891040Sarr } 59940159Speter } 60091040Sarr if (deps) { 60191040Sarr for (i = 0; i < file->ndeps; i++) { 60291040Sarr address = linker_file_lookup_symbol(file->deps[i], 60391040Sarr name, 0); 60491040Sarr if (address) { 60591040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol:" 60691040Sarr " deps value=%x\n", address)); 60791040Sarr return (address); 60891040Sarr } 60991040Sarr } 61025537Sdfr } 61191040Sarr if (common_size > 0) { 61291040Sarr /* 61391040Sarr * This is a common symbol which was not found in the 61491040Sarr * dependencies. We maintain a simple common symbol table in 61591040Sarr * the file object. 61691040Sarr */ 61791040Sarr struct common_symbol *cp; 61842849Speter 61991040Sarr STAILQ_FOREACH(cp, &file->common, link) { 62092032Sdwmalone if (strcmp(cp->name, name) == 0) { 62191040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol:" 62291040Sarr " old common value=%x\n", cp->address)); 62391040Sarr return (cp->address); 62491040Sarr } 62591040Sarr } 62691040Sarr /* 62791040Sarr * Round the symbol size up to align. 62891040Sarr */ 62991040Sarr common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 63091040Sarr cp = malloc(sizeof(struct common_symbol) 63191040Sarr + common_size + strlen(name) + 1, M_LINKER, 63291040Sarr M_WAITOK | M_ZERO); 63391040Sarr if (cp == NULL) { 63491040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 63591040Sarr return (0); 63691040Sarr } 63791040Sarr cp->address = (caddr_t)(cp + 1); 63891040Sarr cp->name = cp->address + common_size; 63991040Sarr strcpy(cp->name, name); 64091040Sarr bzero(cp->address, common_size); 64191040Sarr STAILQ_INSERT_TAIL(&file->common, cp, link); 64225537Sdfr 64391040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: new common" 64491040Sarr " value=%x\n", cp->address)); 64591040Sarr return (cp->address); 64640159Speter } 64791040Sarr KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 64891040Sarr return (0); 64925537Sdfr} 65025537Sdfr 65140159Speter#ifdef DDB 65225537Sdfr/* 65391040Sarr * DDB Helpers. DDB has to look across multiple files with their own symbol 65491040Sarr * tables and string tables. 65591040Sarr * 65691040Sarr * Note that we do not obey list locking protocols here. We really don't need 65791040Sarr * DDB to hang because somebody's got the lock held. We'll take the chance 65891040Sarr * that the files list is inconsistant instead. 65940159Speter */ 66040159Speter 66140159Speterint 66243309Sdillonlinker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 66340159Speter{ 66491040Sarr linker_file_t lf; 66540159Speter 66691040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 66791040Sarr if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 66891040Sarr return (0); 66991040Sarr } 67091040Sarr return (ENOENT); 67140159Speter} 67240159Speter 67340159Speterint 67443309Sdillonlinker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 67540159Speter{ 67691040Sarr linker_file_t lf; 67791040Sarr c_linker_sym_t best, es; 67891040Sarr u_long diff, bestdiff, off; 67940159Speter 68091040Sarr best = 0; 68191040Sarr off = (uintptr_t)value; 68291040Sarr bestdiff = off; 68391040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 68491040Sarr if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 68591040Sarr continue; 68691040Sarr if (es != 0 && diff < bestdiff) { 68791040Sarr best = es; 68891040Sarr bestdiff = diff; 68991040Sarr } 69091040Sarr if (bestdiff == 0) 69191040Sarr break; 69240159Speter } 69391040Sarr if (best) { 69491040Sarr *sym = best; 69591040Sarr *diffp = bestdiff; 69691040Sarr return (0); 69791040Sarr } else { 69891040Sarr *sym = 0; 69991040Sarr *diffp = off; 70091040Sarr return (ENOENT); 70191040Sarr } 70240159Speter} 70340159Speter 70440159Speterint 70543309Sdillonlinker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 70640159Speter{ 70791040Sarr linker_file_t lf; 70840159Speter 70991040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 71091040Sarr if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 71191040Sarr return (0); 71291040Sarr } 71391040Sarr return (ENOENT); 71440159Speter} 71540159Speter#endif 71640159Speter 71740159Speter/* 71825537Sdfr * Syscalls. 71925537Sdfr */ 72082749Sdillon/* 72182749Sdillon * MPSAFE 72282749Sdillon */ 72325537Sdfrint 72491040Sarrkldload(struct thread *td, struct kldload_args *uap) 72525537Sdfr{ 72691040Sarr char *kldname, *modname; 72791040Sarr char *pathname = NULL; 72891040Sarr linker_file_t lf; 72991040Sarr int error = 0; 73025537Sdfr 73191040Sarr td->td_retval[0] = -1; 73225537Sdfr 73391040Sarr mtx_lock(&Giant); 73482749Sdillon 73593159Sarr if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 73693159Sarr goto out; 73793159Sarr 73893593Sjhb if ((error = suser(td)) != 0) 73991040Sarr goto out; 74025537Sdfr 74191040Sarr pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 74291040Sarr if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 74391040Sarr NULL)) != 0) 74491040Sarr goto out; 74525537Sdfr 74691040Sarr /* 74791040Sarr * If path do not contain qualified name or any dot in it 74891040Sarr * (kldname.ko, or kldname.ver.ko) treat it as interface 74991040Sarr * name. 75091040Sarr */ 75191040Sarr if (index(pathname, '/') || index(pathname, '.')) { 75291040Sarr kldname = pathname; 75391040Sarr modname = NULL; 75491040Sarr } else { 75591040Sarr kldname = NULL; 75691040Sarr modname = pathname; 75791040Sarr } 75891040Sarr error = linker_load_module(kldname, modname, NULL, NULL, &lf); 75991040Sarr if (error) 76091040Sarr goto out; 76142316Smsmith 76291040Sarr lf->userrefs++; 76391040Sarr td->td_retval[0] = lf->id; 76425537Sdfrout: 76591040Sarr if (pathname) 76691040Sarr free(pathname, M_TEMP); 76791040Sarr mtx_unlock(&Giant); 76891040Sarr return (error); 76925537Sdfr} 77025537Sdfr 77182749Sdillon/* 77282749Sdillon * MPSAFE 77382749Sdillon */ 77425537Sdfrint 77591040Sarrkldunload(struct thread *td, struct kldunload_args *uap) 77625537Sdfr{ 77791040Sarr linker_file_t lf; 77891040Sarr int error = 0; 77925537Sdfr 78091040Sarr mtx_lock(&Giant); 78182749Sdillon 78293159Sarr if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 78393159Sarr goto out; 78493159Sarr 78593593Sjhb if ((error = suser(td)) != 0) 78691040Sarr goto out; 78725537Sdfr 78891040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 78991040Sarr if (lf) { 79091040Sarr KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 79191040Sarr if (lf->userrefs == 0) { 79291040Sarr printf("kldunload: attempt to unload file that was" 79391040Sarr " loaded by the kernel\n"); 79491040Sarr error = EBUSY; 79591040Sarr goto out; 79691040Sarr } 79791068Sarr lf->userrefs--; 79891040Sarr error = linker_file_unload(lf); 79991040Sarr if (error) 80091040Sarr lf->userrefs++; 80191040Sarr } else 80291040Sarr error = ENOENT; 80325537Sdfrout: 80491068Sarr mtx_unlock(&Giant); 80591068Sarr return (error); 80625537Sdfr} 80725537Sdfr 80882749Sdillon/* 80982749Sdillon * MPSAFE 81082749Sdillon */ 81125537Sdfrint 81291040Sarrkldfind(struct thread *td, struct kldfind_args *uap) 81325537Sdfr{ 81491040Sarr char *pathname; 81591040Sarr const char *filename; 81691040Sarr linker_file_t lf; 81791040Sarr int error = 0; 81825537Sdfr 81991040Sarr mtx_lock(&Giant); 82091040Sarr td->td_retval[0] = -1; 82182749Sdillon 82291040Sarr pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 82391040Sarr if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, 82491040Sarr NULL)) != 0) 82591040Sarr goto out; 82625537Sdfr 82791040Sarr filename = linker_basename(pathname); 82891040Sarr lf = linker_find_file_by_name(filename); 82991040Sarr if (lf) 83091040Sarr td->td_retval[0] = lf->id; 83191040Sarr else 83291040Sarr error = ENOENT; 83325537Sdfrout: 83491040Sarr if (pathname) 83591040Sarr free(pathname, M_TEMP); 83691040Sarr mtx_unlock(&Giant); 83791040Sarr return (error); 83825537Sdfr} 83925537Sdfr 84082749Sdillon/* 84182749Sdillon * MPSAFE 84282749Sdillon */ 84325537Sdfrint 84491040Sarrkldnext(struct thread *td, struct kldnext_args *uap) 84525537Sdfr{ 84691040Sarr linker_file_t lf; 84791040Sarr int error = 0; 84825537Sdfr 84991040Sarr mtx_lock(&Giant); 85082749Sdillon 85191040Sarr if (SCARG(uap, fileid) == 0) { 85298452Sarr mtx_lock(&kld_mtx); 85391040Sarr if (TAILQ_FIRST(&linker_files)) 85491040Sarr td->td_retval[0] = TAILQ_FIRST(&linker_files)->id; 85591040Sarr else 85691040Sarr td->td_retval[0] = 0; 85798452Sarr mtx_unlock(&kld_mtx); 85891040Sarr goto out; 85991040Sarr } 86091040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 86191040Sarr if (lf) { 86291040Sarr if (TAILQ_NEXT(lf, link)) 86391040Sarr td->td_retval[0] = TAILQ_NEXT(lf, link)->id; 86491040Sarr else 86591040Sarr td->td_retval[0] = 0; 86691040Sarr } else 86791040Sarr error = ENOENT; 86882749Sdillonout: 86991040Sarr mtx_unlock(&Giant); 87091040Sarr return (error); 87125537Sdfr} 87225537Sdfr 87382749Sdillon/* 87482749Sdillon * MPSAFE 87582749Sdillon */ 87625537Sdfrint 87791040Sarrkldstat(struct thread *td, struct kldstat_args *uap) 87825537Sdfr{ 87991040Sarr linker_file_t lf; 88091040Sarr int error = 0; 88191040Sarr int namelen, version; 88291040Sarr struct kld_file_stat *stat; 88325537Sdfr 88491040Sarr mtx_lock(&Giant); 88582749Sdillon 88691040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 88791040Sarr if (lf == NULL) { 88891040Sarr error = ENOENT; 88991040Sarr goto out; 89091040Sarr } 89191040Sarr stat = SCARG(uap, stat); 89225537Sdfr 89391040Sarr /* 89491040Sarr * Check the version of the user's structure. 89591040Sarr */ 89691040Sarr if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 89791040Sarr goto out; 89891040Sarr if (version != sizeof(struct kld_file_stat)) { 89991040Sarr error = EINVAL; 90091040Sarr goto out; 90191040Sarr } 90291040Sarr namelen = strlen(lf->filename) + 1; 90391040Sarr if (namelen > MAXPATHLEN) 90491040Sarr namelen = MAXPATHLEN; 90591040Sarr if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 90691040Sarr goto out; 90791040Sarr if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 90891040Sarr goto out; 90991040Sarr if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 91091040Sarr goto out; 91191040Sarr if ((error = copyout(&lf->address, &stat->address, 91291040Sarr sizeof(caddr_t))) != 0) 91391040Sarr goto out; 91491040Sarr if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 91591040Sarr goto out; 91625537Sdfr 91791040Sarr td->td_retval[0] = 0; 91825537Sdfrout: 91991040Sarr mtx_unlock(&Giant); 92091040Sarr return (error); 92125537Sdfr} 92225537Sdfr 92382749Sdillon/* 92482749Sdillon * MPSAFE 92582749Sdillon */ 92625537Sdfrint 92791040Sarrkldfirstmod(struct thread *td, struct kldfirstmod_args *uap) 92825537Sdfr{ 92991040Sarr linker_file_t lf; 93091040Sarr module_t mp; 93191040Sarr int error = 0; 93225537Sdfr 93391040Sarr mtx_lock(&Giant); 93491040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 93591040Sarr if (lf) { 93692547Sarr MOD_SLOCK; 93791040Sarr mp = TAILQ_FIRST(&lf->modules); 93891040Sarr if (mp != NULL) 93991040Sarr td->td_retval[0] = module_getid(mp); 94091040Sarr else 94191040Sarr td->td_retval[0] = 0; 94292547Sarr MOD_SUNLOCK; 94391040Sarr } else 94491040Sarr error = ENOENT; 94591040Sarr mtx_unlock(&Giant); 94691040Sarr return (error); 94725537Sdfr} 94840159Speter 94982749Sdillon/* 95082749Sdillon * MPSAFE 95182749Sdillon */ 95241090Speterint 95383366Sjuliankldsym(struct thread *td, struct kldsym_args *uap) 95441090Speter{ 95591040Sarr char *symstr = NULL; 95691040Sarr c_linker_sym_t sym; 95791040Sarr linker_symval_t symval; 95891040Sarr linker_file_t lf; 95991040Sarr struct kld_sym_lookup lookup; 96091040Sarr int error = 0; 96141090Speter 96291040Sarr mtx_lock(&Giant); 96382749Sdillon 96491040Sarr if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0) 96591040Sarr goto out; 96691068Sarr if (lookup.version != sizeof(lookup) || 96791040Sarr SCARG(uap, cmd) != KLDSYM_LOOKUP) { 96891040Sarr error = EINVAL; 96991040Sarr goto out; 97091040Sarr } 97191040Sarr symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 97291040Sarr if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 97391040Sarr goto out; 97491040Sarr if (SCARG(uap, fileid) != 0) { 97591040Sarr lf = linker_find_file_by_id(SCARG(uap, fileid)); 97691040Sarr if (lf == NULL) { 97791040Sarr error = ENOENT; 97891040Sarr goto out; 97991040Sarr } 98091040Sarr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 98191040Sarr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 98291040Sarr lookup.symvalue = (uintptr_t) symval.value; 98391040Sarr lookup.symsize = symval.size; 98491040Sarr error = copyout(&lookup, SCARG(uap, data), 98591040Sarr sizeof(lookup)); 98691040Sarr } else 98791040Sarr error = ENOENT; 98891040Sarr } else { 98998452Sarr mtx_lock(&kld_mtx); 99091040Sarr TAILQ_FOREACH(lf, &linker_files, link) { 99191040Sarr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 99291040Sarr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 99391040Sarr lookup.symvalue = (uintptr_t)symval.value; 99491040Sarr lookup.symsize = symval.size; 99591040Sarr error = copyout(&lookup, SCARG(uap, data), 99691040Sarr sizeof(lookup)); 99791068Sarr break; 99891040Sarr } 99991040Sarr } 100098452Sarr mtx_unlock(&kld_mtx); 100191040Sarr if (lf == NULL) 100291040Sarr error = ENOENT; 100341090Speter } 100441090Speterout: 100591040Sarr if (symstr) 100691040Sarr free(symstr, M_TEMP); 100791040Sarr mtx_unlock(&Giant); 100891040Sarr return (error); 100941090Speter} 101041090Speter 101140159Speter/* 101240159Speter * Preloaded module support 101340159Speter */ 101440159Speter 101559751Speterstatic modlist_t 101674642Sbpmodlist_lookup(const char *name, int ver) 101759751Speter{ 101891040Sarr modlist_t mod; 101959751Speter 102091040Sarr TAILQ_FOREACH(mod, &found_modules, link) { 102192032Sdwmalone if (strcmp(mod->name, name) == 0 && 102292032Sdwmalone (ver == 0 || mod->version == ver)) 102391040Sarr return (mod); 102491040Sarr } 102591040Sarr return (NULL); 102659751Speter} 102759751Speter 102874642Sbpstatic modlist_t 102983321Spetermodlist_lookup2(const char *name, struct mod_depend *verinfo) 103083321Speter{ 103191040Sarr modlist_t mod, bestmod; 103292032Sdwmalone int ver; 103383321Speter 103491040Sarr if (verinfo == NULL) 103591040Sarr return (modlist_lookup(name, 0)); 103691040Sarr bestmod = NULL; 103791040Sarr for (mod = TAILQ_FIRST(&found_modules); mod; 103891040Sarr mod = TAILQ_NEXT(mod, link)) { 103992032Sdwmalone if (strcmp(mod->name, name) != 0) 104091040Sarr continue; 104191040Sarr ver = mod->version; 104291040Sarr if (ver == verinfo->md_ver_preferred) 104391040Sarr return (mod); 104491040Sarr if (ver >= verinfo->md_ver_minimum && 104591068Sarr ver <= verinfo->md_ver_maximum && 104691068Sarr ver > bestmod->version) 104791040Sarr bestmod = mod; 104891040Sarr } 104991040Sarr return (bestmod); 105083321Speter} 105183321Speter 105283321Speterstatic modlist_t 105378501Sdesmodlist_newmodule(const char *modname, int version, linker_file_t container) 105474642Sbp{ 105591040Sarr modlist_t mod; 105674642Sbp 105792705Sarr mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO); 105891040Sarr if (mod == NULL) 105991040Sarr panic("no memory for module list"); 106091040Sarr mod->container = container; 106191040Sarr mod->name = modname; 106291040Sarr mod->version = version; 106391040Sarr TAILQ_INSERT_TAIL(&found_modules, mod, link); 106491040Sarr return (mod); 106574642Sbp} 106674642Sbp 106759751Speter/* 106859751Speter * This routine is cheap and nasty but will work for data pointers. 106959751Speter */ 107059751Speterstatic void * 107178501Sdeslinker_reloc_ptr(linker_file_t lf, const void *offset) 107259751Speter{ 107391040Sarr return (lf->address + (uintptr_t)offset); 107459751Speter} 107559751Speter 107674642Sbp/* 107774642Sbp * Dereference MDT_VERSION metadata into module name and version 107874642Sbp */ 107940159Speterstatic void 108074642Sbplinker_mdt_version(linker_file_t lf, struct mod_metadata *mp, 108191040Sarr const char **modname, int *version) 108274642Sbp{ 108391040Sarr struct mod_version *mvp; 108474642Sbp 108591040Sarr if (modname) 108691040Sarr *modname = linker_reloc_ptr(lf, mp->md_cval); 108791040Sarr if (version) { 108891040Sarr mvp = linker_reloc_ptr(lf, mp->md_data); 108991040Sarr *version = mvp->mv_version; 109091040Sarr } 109174642Sbp} 109274642Sbp 109374642Sbp/* 109474642Sbp * Dereference MDT_DEPEND metadata into module name and mod_depend structure 109574642Sbp */ 109674642Sbpstatic void 109774642Sbplinker_mdt_depend(linker_file_t lf, struct mod_metadata *mp, 109891040Sarr const char **modname, struct mod_depend **verinfo) 109974642Sbp{ 110074642Sbp 110191040Sarr if (modname) 110291040Sarr *modname = linker_reloc_ptr(lf, mp->md_cval); 110391040Sarr if (verinfo) 110491040Sarr *verinfo = linker_reloc_ptr(lf, mp->md_data); 110574642Sbp} 110674642Sbp 110774642Sbpstatic void 110878161Speterlinker_addmodules(linker_file_t lf, struct mod_metadata **start, 110991040Sarr struct mod_metadata **stop, int preload) 111074642Sbp{ 111191040Sarr struct mod_metadata *mp, **mdp; 111291040Sarr const char *modname; 111391040Sarr int ver; 111474642Sbp 111591040Sarr for (mdp = start; mdp < stop; mdp++) { 111691040Sarr if (preload) 111791040Sarr mp = *mdp; 111891040Sarr else 111991040Sarr mp = linker_reloc_ptr(lf, *mdp); 112091040Sarr if (mp->md_type != MDT_VERSION) 112191040Sarr continue; 112291040Sarr if (preload) { 112391040Sarr modname = mp->md_cval; 112491040Sarr ver = ((struct mod_version *)mp->md_data)->mv_version; 112591040Sarr } else 112691040Sarr linker_mdt_version(lf, mp, &modname, &ver); 112791040Sarr if (modlist_lookup(modname, ver) != NULL) { 112891040Sarr printf("module %s already present!\n", modname); 112991040Sarr /* XXX what can we do? this is a build error. :-( */ 113091040Sarr continue; 113191040Sarr } 113291040Sarr modlist_newmodule(modname, ver, lf); 113374642Sbp } 113474642Sbp} 113574642Sbp 113674642Sbpstatic void 113791040Sarrlinker_preload(void *arg) 113840159Speter{ 113991040Sarr caddr_t modptr; 114091040Sarr const char *modname, *nmodname; 114191040Sarr char *modtype; 114291040Sarr linker_file_t lf; 114391040Sarr linker_class_t lc; 114492032Sdwmalone int error; 114591040Sarr linker_file_list_t loaded_files; 114691040Sarr linker_file_list_t depended_files; 114791040Sarr struct mod_metadata *mp, *nmp; 114891040Sarr struct mod_metadata **start, **stop, **mdp, **nmdp; 114991040Sarr struct mod_depend *verinfo; 115091040Sarr int nver; 115191040Sarr int resolves; 115291040Sarr modlist_t mod; 115391040Sarr struct sysinit **si_start, **si_stop; 115440159Speter 115591040Sarr TAILQ_INIT(&loaded_files); 115691040Sarr TAILQ_INIT(&depended_files); 115791040Sarr TAILQ_INIT(&found_modules); 115891040Sarr error = 0; 115959751Speter 116091040Sarr modptr = NULL; 116191040Sarr while ((modptr = preload_search_next_name(modptr)) != NULL) { 116291040Sarr modname = (char *)preload_search_info(modptr, MODINFO_NAME); 116391040Sarr modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 116491040Sarr if (modname == NULL) { 116591040Sarr printf("Preloaded module at %p does not have a" 116691040Sarr " name!\n", modptr); 116791040Sarr continue; 116891040Sarr } 116991040Sarr if (modtype == NULL) { 117091040Sarr printf("Preloaded module at %p does not have a type!\n", 117191040Sarr modptr); 117291040Sarr continue; 117391040Sarr } 117491040Sarr printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, 117591040Sarr modptr); 117640159Speter lf = NULL; 117791040Sarr TAILQ_FOREACH(lc, &classes, link) { 117891040Sarr error = LINKER_LINK_PRELOAD(lc, modname, &lf); 117991040Sarr if (error) { 118091040Sarr lf = NULL; 118191040Sarr break; 118291040Sarr } 118391040Sarr } 118491040Sarr if (lf) 118591040Sarr TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 118640159Speter } 118740159Speter 118891040Sarr /* 118991040Sarr * First get a list of stuff in the kernel. 119091040Sarr */ 119191040Sarr if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start, 119291040Sarr &stop, NULL) == 0) 119391040Sarr linker_addmodules(linker_kernel_file, start, stop, 1); 119459751Speter 119559751Speter /* 119691040Sarr * this is a once-off kinky bubble sort resolve relocation dependency 119791040Sarr * requirements 119859751Speter */ 119991040Sarrrestart: 120091040Sarr TAILQ_FOREACH(lf, &loaded_files, loaded) { 120191040Sarr error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 120291040Sarr &stop, NULL); 120391040Sarr /* 120491040Sarr * First, look to see if we would successfully link with this 120591040Sarr * stuff. 120691040Sarr */ 120791040Sarr resolves = 1; /* unless we know otherwise */ 120891040Sarr if (!error) { 120991040Sarr for (mdp = start; mdp < stop; mdp++) { 121091040Sarr mp = linker_reloc_ptr(lf, *mdp); 121191040Sarr if (mp->md_type != MDT_DEPEND) 121291040Sarr continue; 121391040Sarr linker_mdt_depend(lf, mp, &modname, &verinfo); 121491040Sarr for (nmdp = start; nmdp < stop; nmdp++) { 121591040Sarr nmp = linker_reloc_ptr(lf, *nmdp); 121691040Sarr if (nmp->md_type != MDT_VERSION) 121791040Sarr continue; 121891040Sarr linker_mdt_version(lf, nmp, &nmodname, 121991040Sarr NULL); 122091040Sarr nmodname = linker_reloc_ptr(lf, 122191040Sarr nmp->md_cval); 122292032Sdwmalone if (strcmp(modname, nmodname) == 0) 122391040Sarr break; 122491040Sarr } 122591040Sarr if (nmdp < stop) /* it's a self reference */ 122691040Sarr continue; 122791040Sarr 122891040Sarr /* 122991040Sarr * ok, the module isn't here yet, we 123091040Sarr * are not finished 123191040Sarr */ 123291068Sarr if (modlist_lookup2(modname, verinfo) == NULL) 123391040Sarr resolves = 0; 123491040Sarr } 123564143Speter } 123691040Sarr /* 123791040Sarr * OK, if we found our modules, we can link. So, "provide" 123891040Sarr * the modules inside and add it to the end of the link order 123991040Sarr * list. 124091040Sarr */ 124191040Sarr if (resolves) { 124291040Sarr if (!error) { 124391040Sarr for (mdp = start; mdp < stop; mdp++) { 124491040Sarr mp = linker_reloc_ptr(lf, *mdp); 124591040Sarr if (mp->md_type != MDT_VERSION) 124691040Sarr continue; 124791040Sarr linker_mdt_version(lf, mp, 124891040Sarr &modname, &nver); 124991040Sarr if (modlist_lookup(modname, 125091040Sarr nver) != NULL) { 125191040Sarr printf("module %s already" 125291040Sarr " present!\n", modname); 125391040Sarr linker_file_unload(lf); 125491040Sarr TAILQ_REMOVE(&loaded_files, 125591040Sarr lf, loaded); 125691040Sarr /* we changed tailq next ptr */ 125791068Sarr goto restart; 125891040Sarr } 125991040Sarr modlist_newmodule(modname, nver, lf); 126091040Sarr } 126191040Sarr } 126291040Sarr TAILQ_REMOVE(&loaded_files, lf, loaded); 126391040Sarr TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 126491040Sarr /* 126591040Sarr * Since we provided modules, we need to restart the 126691040Sarr * sort so that the previous files that depend on us 126791040Sarr * have a chance. Also, we've busted the tailq next 126891040Sarr * pointer with the REMOVE. 126991040Sarr */ 127091040Sarr goto restart; 127159751Speter } 127259751Speter } 127391040Sarr 127459751Speter /* 127591040Sarr * At this point, we check to see what could not be resolved.. 127659751Speter */ 127791040Sarr TAILQ_FOREACH(lf, &loaded_files, loaded) { 127891040Sarr printf("KLD file %s is missing dependencies\n", lf->filename); 127991040Sarr linker_file_unload(lf); 128091040Sarr TAILQ_REMOVE(&loaded_files, lf, loaded); 128140159Speter } 128259751Speter 128378161Speter /* 128491040Sarr * We made it. Finish off the linking in the order we determined. 128578161Speter */ 128691040Sarr TAILQ_FOREACH(lf, &depended_files, loaded) { 128791040Sarr if (linker_kernel_file) { 128891040Sarr linker_kernel_file->refs++; 128991040Sarr error = linker_file_add_dependency(lf, 129091040Sarr linker_kernel_file); 129191040Sarr if (error) 129291040Sarr panic("cannot add dependency"); 129391040Sarr } 129491040Sarr lf->userrefs++; /* so we can (try to) kldunload it */ 129591040Sarr error = linker_file_lookup_set(lf, MDT_SETNAME, &start, 129691040Sarr &stop, NULL); 129791040Sarr if (!error) { 129891040Sarr for (mdp = start; mdp < stop; mdp++) { 129991040Sarr mp = linker_reloc_ptr(lf, *mdp); 130091040Sarr if (mp->md_type != MDT_DEPEND) 130191040Sarr continue; 130291040Sarr linker_mdt_depend(lf, mp, &modname, &verinfo); 130391040Sarr mod = modlist_lookup2(modname, verinfo); 130491040Sarr mod->container->refs++; 130591040Sarr error = linker_file_add_dependency(lf, 130691040Sarr mod->container); 130791040Sarr if (error) 130891040Sarr panic("cannot add dependency"); 130991040Sarr } 131091040Sarr } 131191040Sarr /* 131291040Sarr * Now do relocation etc using the symbol search paths 131391040Sarr * established by the dependencies 131491040Sarr */ 131591040Sarr error = LINKER_LINK_PRELOAD_FINISH(lf); 131691040Sarr if (error) { 131791040Sarr printf("KLD file %s - could not finalize loading\n", 131891040Sarr lf->filename); 131991040Sarr linker_file_unload(lf); 132091040Sarr continue; 132191040Sarr } 132291040Sarr linker_file_register_modules(lf); 132391040Sarr if (linker_file_lookup_set(lf, "sysinit_set", &si_start, 132491040Sarr &si_stop, NULL) == 0) 132591040Sarr sysinit_add(si_start, si_stop); 132691040Sarr linker_file_register_sysctls(lf); 132791040Sarr lf->flags |= LINKER_FILE_LINKED; 132859751Speter } 132991040Sarr /* woohoo! we made it! */ 133040159Speter} 133140159Speter 133291040SarrSYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0) 133340159Speter 133440159Speter/* 133540159Speter * Search for a not-loaded module by name. 133691040Sarr * 133740159Speter * Modules may be found in the following locations: 133891040Sarr * 133991040Sarr * - preloaded (result is just the module name) - on disk (result is full path 134091040Sarr * to module) 134191040Sarr * 134291040Sarr * If the module name is qualified in any way (contains path, etc.) the we 134391040Sarr * simply return a copy of it. 134491040Sarr * 134540159Speter * The search path can be manipulated via sysctl. Note that we use the ';' 134640159Speter * character as a separator to be consistent with the bootloader. 134740159Speter */ 134840159Speter 134983321Speterstatic char linker_hintfile[] = "linker.hints"; 135083358Speterstatic char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules;/modules"; 135140159Speter 135240159SpeterSYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 135391040Sarr sizeof(linker_path), "module load search path"); 135440159Speter 135577843SpeterTUNABLE_STR("module_path", linker_path, sizeof(linker_path)); 135670417Speter 135759751Speterstatic char *linker_ext_list[] = { 135883321Speter "", 135959751Speter ".ko", 136059751Speter NULL 136159751Speter}; 136259751Speter 136383321Speter/* 136491040Sarr * Check if file actually exists either with or without extension listed in 136591040Sarr * the linker_ext_list. (probably should be generic for the rest of the 136691040Sarr * kernel) 136783321Speter */ 136859751Speterstatic char * 136991040Sarrlinker_lookup_file(const char *path, int pathlen, const char *name, 137091040Sarr int namelen, struct vattr *vap) 137140159Speter{ 137291040Sarr struct nameidata nd; 137391040Sarr struct thread *td = curthread; /* XXX */ 137491040Sarr char *result, **cpp, *sep; 137591040Sarr int error, len, extlen, reclen, flags; 137691040Sarr enum vtype type; 137740159Speter 137891040Sarr extlen = 0; 137991040Sarr for (cpp = linker_ext_list; *cpp; cpp++) { 138091040Sarr len = strlen(*cpp); 138191040Sarr if (len > extlen) 138291040Sarr extlen = len; 138391040Sarr } 138491040Sarr extlen++; /* trailing '\0' */ 138591040Sarr sep = (path[pathlen - 1] != '/') ? "/" : ""; 138683321Speter 138791040Sarr reclen = pathlen + strlen(sep) + namelen + extlen + 1; 138891040Sarr result = malloc(reclen, M_LINKER, M_WAITOK); 138991040Sarr for (cpp = linker_ext_list; *cpp; cpp++) { 139091040Sarr snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep, 139191040Sarr namelen, name, *cpp); 139291040Sarr /* 139391040Sarr * Attempt to open the file, and return the path if 139491040Sarr * we succeed and it's a regular file. 139591040Sarr */ 139691040Sarr NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td); 139791040Sarr flags = FREAD; 139891040Sarr error = vn_open(&nd, &flags, 0); 139991040Sarr if (error == 0) { 140091040Sarr NDFREE(&nd, NDF_ONLY_PNBUF); 140191040Sarr type = nd.ni_vp->v_type; 140291040Sarr if (vap) 140391406Sjhb VOP_GETATTR(nd.ni_vp, vap, td->td_ucred, td); 140491040Sarr VOP_UNLOCK(nd.ni_vp, 0, td); 140591406Sjhb vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 140691040Sarr if (type == VREG) 140791040Sarr return (result); 140891040Sarr } 140983321Speter } 141091040Sarr free(result, M_LINKER); 141191040Sarr return (NULL); 141283321Speter} 141383321Speter 141491040Sarr#define INT_ALIGN(base, ptr) ptr = \ 141583321Speter (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1)) 141683321Speter 141783321Speter/* 141891040Sarr * Lookup KLD which contains requested module in the "linker.hints" file. If 141991040Sarr * version specification is available, then try to find the best KLD. 142083321Speter * Otherwise just find the latest one. 142183321Speter */ 142283321Speterstatic char * 142391040Sarrlinker_hints_lookup(const char *path, int pathlen, const char *modname, 142491040Sarr int modnamelen, struct mod_depend *verinfo) 142583321Speter{ 142691040Sarr struct thread *td = curthread; /* XXX */ 142791406Sjhb struct ucred *cred = td ? td->td_ucred : NULL; 142891040Sarr struct nameidata nd; 142991040Sarr struct vattr vattr, mattr; 143091040Sarr u_char *hints = NULL; 143191040Sarr u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep; 143291040Sarr int error, ival, bestver, *intp, reclen, found, flags, clen, blen; 143383321Speter 143491040Sarr result = NULL; 143591040Sarr bestver = found = 0; 143683321Speter 143791040Sarr sep = (path[pathlen - 1] != '/') ? "/" : ""; 143891040Sarr reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen + 143991040Sarr strlen(sep) + 1; 144091040Sarr pathbuf = malloc(reclen, M_LINKER, M_WAITOK); 144191040Sarr snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep, 144291040Sarr linker_hintfile); 144383321Speter 144491040Sarr NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td); 144591040Sarr flags = FREAD; 144691040Sarr error = vn_open(&nd, &flags, 0); 144791040Sarr if (error) 144891040Sarr goto bad; 144991040Sarr NDFREE(&nd, NDF_ONLY_PNBUF); 145091040Sarr if (nd.ni_vp->v_type != VREG) 145191040Sarr goto bad; 145291040Sarr best = cp = NULL; 145391040Sarr error = VOP_GETATTR(nd.ni_vp, &vattr, cred, td); 145491040Sarr if (error) 145591040Sarr goto bad; 145691040Sarr /* 145791040Sarr * XXX: we need to limit this number to some reasonable value 145891040Sarr */ 145991040Sarr if (vattr.va_size > 100 * 1024) { 146091040Sarr printf("hints file too large %ld\n", (long)vattr.va_size); 146191040Sarr goto bad; 146291040Sarr } 146391040Sarr hints = malloc(vattr.va_size, M_TEMP, M_WAITOK); 146491040Sarr if (hints == NULL) 146591040Sarr goto bad; 146691068Sarr error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0, 1467101941Srwatson UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td); 146891040Sarr if (error) 146991040Sarr goto bad; 147099553Sjeff VOP_UNLOCK(nd.ni_vp, 0, td); 147191040Sarr vn_close(nd.ni_vp, FREAD, cred, td); 147291040Sarr nd.ni_vp = NULL; 147391040Sarr if (reclen != 0) { 147491040Sarr printf("can't read %d\n", reclen); 147591040Sarr goto bad; 147691040Sarr } 147791040Sarr intp = (int *)hints; 147883321Speter ival = *intp++; 147991040Sarr if (ival != LINKER_HINTS_VERSION) { 148091040Sarr printf("hints file version mismatch %d\n", ival); 148191040Sarr goto bad; 148283321Speter } 148391040Sarr bufend = hints + vattr.va_size; 148491040Sarr recptr = (u_char *)intp; 148591040Sarr clen = blen = 0; 148691040Sarr while (recptr < bufend && !found) { 148791040Sarr intp = (int *)recptr; 148891040Sarr reclen = *intp++; 148991040Sarr ival = *intp++; 149091040Sarr cp = (char *)intp; 149191040Sarr switch (ival) { 149291040Sarr case MDT_VERSION: 149391040Sarr clen = *cp++; 149491040Sarr if (clen != modnamelen || bcmp(cp, modname, clen) != 0) 149591040Sarr break; 149691040Sarr cp += clen; 149791040Sarr INT_ALIGN(hints, cp); 149891040Sarr ival = *(int *)cp; 149991040Sarr cp += sizeof(int); 150091040Sarr clen = *cp++; 150191040Sarr if (verinfo == NULL || 150291040Sarr ival == verinfo->md_ver_preferred) { 150391040Sarr found = 1; 150491040Sarr break; 150591040Sarr } 150691040Sarr if (ival >= verinfo->md_ver_minimum && 150791040Sarr ival <= verinfo->md_ver_maximum && 150891040Sarr ival > bestver) { 150991040Sarr bestver = ival; 151091040Sarr best = cp; 151191040Sarr blen = clen; 151291040Sarr } 151391040Sarr break; 151491040Sarr default: 151591040Sarr break; 151691040Sarr } 151791040Sarr recptr += reclen + sizeof(int); 151891040Sarr } 151983321Speter /* 152091040Sarr * Finally check if KLD is in the place 152183321Speter */ 152291040Sarr if (found) 152391040Sarr result = linker_lookup_file(path, pathlen, cp, clen, &mattr); 152491040Sarr else if (best) 152591040Sarr result = linker_lookup_file(path, pathlen, best, blen, &mattr); 152691040Sarr 152791040Sarr /* 152891040Sarr * KLD is newer than hints file. What we should do now? 152991040Sarr */ 153091040Sarr if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)) 153191040Sarr printf("warning: KLD '%s' is newer than the linker.hints" 153291040Sarr " file\n", result); 153383321Speterbad: 1534105167Sphk free(pathbuf, M_LINKER); 153591040Sarr if (hints) 153691040Sarr free(hints, M_TEMP); 153799553Sjeff if (nd.ni_vp != NULL) { 153899553Sjeff VOP_UNLOCK(nd.ni_vp, 0, td); 153991040Sarr vn_close(nd.ni_vp, FREAD, cred, td); 154099553Sjeff } 154191040Sarr /* 154291040Sarr * If nothing found or hints is absent - fallback to the old 154391040Sarr * way by using "kldname[.ko]" as module name. 154491040Sarr */ 154591040Sarr if (!found && !bestver && result == NULL) 154691040Sarr result = linker_lookup_file(path, pathlen, modname, 154791040Sarr modnamelen, NULL); 154891040Sarr return (result); 154983321Speter} 155083321Speter 155183321Speter/* 155283321Speter * Lookup KLD which contains requested module in the all directories. 155383321Speter */ 155483321Speterstatic char * 155583321Speterlinker_search_module(const char *modname, int modnamelen, 155691040Sarr struct mod_depend *verinfo) 155783321Speter{ 155891040Sarr char *cp, *ep, *result; 155983321Speter 156091040Sarr /* 156191040Sarr * traverse the linker path 156291040Sarr */ 156391040Sarr for (cp = linker_path; *cp; cp = ep + 1) { 156491040Sarr /* find the end of this component */ 156591040Sarr for (ep = cp; (*ep != 0) && (*ep != ';'); ep++); 156691068Sarr result = linker_hints_lookup(cp, ep - cp, modname, 156791068Sarr modnamelen, verinfo); 156891040Sarr if (result != NULL) 156991040Sarr return (result); 157091040Sarr if (*ep == 0) 157191040Sarr break; 157291040Sarr } 157391040Sarr return (NULL); 157483321Speter} 157583321Speter 157683321Speter/* 157783321Speter * Search for module in all directories listed in the linker_path. 157883321Speter */ 157983321Speterstatic char * 158083321Speterlinker_search_kld(const char *name) 158183321Speter{ 158291040Sarr char *cp, *ep, *result, **cpp; 158391040Sarr int extlen, len; 158483321Speter 158591040Sarr /* qualified at all? */ 158691040Sarr if (index(name, '/')) 158791040Sarr return (linker_strdup(name)); 158840159Speter 158991040Sarr extlen = 0; 159091040Sarr for (cpp = linker_ext_list; *cpp; cpp++) { 159191040Sarr len = strlen(*cpp); 159291040Sarr if (len > extlen) 159391040Sarr extlen = len; 159491040Sarr } 159591040Sarr extlen++; /* trailing '\0' */ 159659751Speter 159791040Sarr /* traverse the linker path */ 159891040Sarr len = strlen(name); 159991040Sarr for (ep = linker_path; *ep; ep++) { 160091040Sarr cp = ep; 160191040Sarr /* find the end of this component */ 160291040Sarr for (; *ep != 0 && *ep != ';'; ep++); 160391040Sarr result = linker_lookup_file(cp, ep - cp, name, len, NULL); 160491040Sarr if (result != NULL) 160591040Sarr return (result); 160691040Sarr } 160791040Sarr return (NULL); 160840159Speter} 160959751Speter 161059751Speterstatic const char * 161191040Sarrlinker_basename(const char *path) 161259751Speter{ 161391040Sarr const char *filename; 161459751Speter 161591040Sarr filename = rindex(path, '/'); 161691040Sarr if (filename == NULL) 161791040Sarr return path; 161891040Sarr if (filename[1]) 161991040Sarr filename++; 162091040Sarr return (filename); 162159751Speter} 162259751Speter 162359751Speter/* 162491040Sarr * Find a file which contains given module and load it, if "parent" is not 162591040Sarr * NULL, register a reference to it. 162659751Speter */ 1627101241Smuxint 162883321Speterlinker_load_module(const char *kldname, const char *modname, 162991040Sarr struct linker_file *parent, struct mod_depend *verinfo, 163091040Sarr struct linker_file **lfpp) 163159751Speter{ 163291040Sarr linker_file_t lfdep; 163391040Sarr const char *filename; 163491040Sarr char *pathname; 163591040Sarr int error; 163659751Speter 163791040Sarr if (modname == NULL) { 163891040Sarr /* 163991040Sarr * We have to load KLD 164091040Sarr */ 164191068Sarr KASSERT(verinfo == NULL, ("linker_load_module: verinfo" 164291068Sarr " is not NULL")); 164391040Sarr pathname = linker_search_kld(kldname); 164491040Sarr } else { 164591040Sarr if (modlist_lookup2(modname, verinfo) != NULL) 164691040Sarr return (EEXIST); 164794322Sbrian if (kldname != NULL) 164894322Sbrian pathname = linker_strdup(kldname); 164995488Sbrian else if (rootvnode == NULL) 165094322Sbrian pathname = NULL; 165194322Sbrian else 165291040Sarr /* 165391040Sarr * Need to find a KLD with required module 165491040Sarr */ 165591040Sarr pathname = linker_search_module(modname, 165691040Sarr strlen(modname), verinfo); 165791040Sarr } 165891040Sarr if (pathname == NULL) 165991040Sarr return (ENOENT); 166091040Sarr 166183321Speter /* 166291040Sarr * Can't load more than one file with the same basename XXX: 166391040Sarr * Actually it should be possible to have multiple KLDs with 166491040Sarr * the same basename but different path because they can 166591040Sarr * provide different versions of the same modules. 166683321Speter */ 166791040Sarr filename = linker_basename(pathname); 166891040Sarr if (linker_find_file_by_name(filename)) { 166991040Sarr error = EEXIST; 167091040Sarr goto out; 167183321Speter } 167291040Sarr do { 167391040Sarr error = linker_load_file(pathname, &lfdep); 167491040Sarr if (error) 167591040Sarr break; 167691040Sarr if (modname && verinfo && 167791040Sarr modlist_lookup2(modname, verinfo) == NULL) { 167891040Sarr linker_file_unload(lfdep); 167991040Sarr error = ENOENT; 168091040Sarr break; 168191040Sarr } 168291040Sarr if (parent) { 168391040Sarr error = linker_file_add_dependency(parent, lfdep); 168491040Sarr if (error) 168591040Sarr break; 168691040Sarr } 168791040Sarr if (lfpp) 168891040Sarr *lfpp = lfdep; 168991040Sarr } while (0); 169059751Speterout: 169191040Sarr if (pathname) 169291040Sarr free(pathname, M_LINKER); 169391040Sarr return (error); 169459751Speter} 169559751Speter 169659751Speter/* 169791040Sarr * This routine is responsible for finding dependencies of userland initiated 169891040Sarr * kldload(2)'s of files. 169959751Speter */ 170059751Speterint 170186469Siedowselinker_load_dependencies(linker_file_t lf) 170259751Speter{ 170391040Sarr linker_file_t lfdep; 170491040Sarr struct mod_metadata **start, **stop, **mdp, **nmdp; 170591040Sarr struct mod_metadata *mp, *nmp; 170691040Sarr struct mod_depend *verinfo; 170791040Sarr modlist_t mod; 170891040Sarr const char *modname, *nmodname; 170992032Sdwmalone int ver, error = 0, count; 171059751Speter 171191040Sarr /* 171291040Sarr * All files are dependant on /kernel. 171391040Sarr */ 171491040Sarr if (linker_kernel_file) { 171591040Sarr linker_kernel_file->refs++; 171691040Sarr error = linker_file_add_dependency(lf, linker_kernel_file); 171791040Sarr if (error) 171891040Sarr return (error); 171959751Speter } 172091040Sarr if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop, 172191040Sarr &count) != 0) 172291040Sarr return (0); 172391040Sarr for (mdp = start; mdp < stop; mdp++) { 172491040Sarr mp = linker_reloc_ptr(lf, *mdp); 172591040Sarr if (mp->md_type != MDT_VERSION) 172691040Sarr continue; 172791040Sarr linker_mdt_version(lf, mp, &modname, &ver); 172891040Sarr mod = modlist_lookup(modname, ver); 172991040Sarr if (mod != NULL) { 173091040Sarr printf("interface %s.%d already present in the KLD" 173191040Sarr " '%s'!\n", modname, ver, 173291040Sarr mod->container->filename); 173391040Sarr return (EEXIST); 173491040Sarr } 173591040Sarr } 173674642Sbp 173791040Sarr for (mdp = start; mdp < stop; mdp++) { 173891040Sarr mp = linker_reloc_ptr(lf, *mdp); 173991040Sarr if (mp->md_type != MDT_DEPEND) 174091040Sarr continue; 174191040Sarr linker_mdt_depend(lf, mp, &modname, &verinfo); 174291040Sarr nmodname = NULL; 174391040Sarr for (nmdp = start; nmdp < stop; nmdp++) { 174491040Sarr nmp = linker_reloc_ptr(lf, *nmdp); 174591040Sarr if (nmp->md_type != MDT_VERSION) 174691040Sarr continue; 174791040Sarr nmodname = linker_reloc_ptr(lf, nmp->md_cval); 174892032Sdwmalone if (strcmp(modname, nmodname) == 0) 174991040Sarr break; 175091040Sarr } 175191040Sarr if (nmdp < stop)/* early exit, it's a self reference */ 175291040Sarr continue; 175391040Sarr mod = modlist_lookup2(modname, verinfo); 175491040Sarr if (mod) { /* woohoo, it's loaded already */ 175591040Sarr lfdep = mod->container; 175691040Sarr lfdep->refs++; 175791040Sarr error = linker_file_add_dependency(lf, lfdep); 175891040Sarr if (error) 175991040Sarr break; 176091040Sarr continue; 176191040Sarr } 176291040Sarr error = linker_load_module(NULL, modname, lf, verinfo, NULL); 176391040Sarr if (error) { 176491040Sarr printf("KLD %s: depends on %s - not available\n", 176591040Sarr lf->filename, modname); 176691040Sarr break; 176791040Sarr } 176859751Speter } 176959751Speter 177091040Sarr if (error) 177191040Sarr return (error); 177291040Sarr linker_addmodules(lf, start, stop, 0); 177391040Sarr return (error); 177459751Speter} 177585736Sgreen 177685736Sgreenstatic int 177785736Sgreensysctl_kern_function_list_iterate(const char *name, void *opaque) 177885736Sgreen{ 177985736Sgreen struct sysctl_req *req; 178085736Sgreen 178185736Sgreen req = opaque; 178285736Sgreen return (SYSCTL_OUT(req, name, strlen(name) + 1)); 178385736Sgreen} 178485736Sgreen 178585736Sgreen/* 178685736Sgreen * Export a nul-separated, double-nul-terminated list of all function names 178785736Sgreen * in the kernel. 178885736Sgreen */ 178985736Sgreenstatic int 179085736Sgreensysctl_kern_function_list(SYSCTL_HANDLER_ARGS) 179185736Sgreen{ 179285736Sgreen linker_file_t lf; 179385736Sgreen int error; 179485736Sgreen 1795100488Struckman sysctl_wire_old_buffer(req, 0); 179698452Sarr mtx_lock(&kld_mtx); 179785736Sgreen TAILQ_FOREACH(lf, &linker_files, link) { 179885736Sgreen error = LINKER_EACH_FUNCTION_NAME(lf, 179985736Sgreen sysctl_kern_function_list_iterate, req); 180098452Sarr if (error) { 180198452Sarr mtx_unlock(&kld_mtx); 180285736Sgreen return (error); 180398452Sarr } 180485736Sgreen } 180598452Sarr mtx_unlock(&kld_mtx); 180685736Sgreen return (SYSCTL_OUT(req, "", 1)); 180785736Sgreen} 180885736Sgreen 180985736SgreenSYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD, 181091040Sarr NULL, 0, sysctl_kern_function_list, "", "kernel function list"); 1811