kern_linker.c revision 74641
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 74641 2001-03-22 07:55:33Z bp $ 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> 3925537Sdfr#include <sys/module.h> 4025537Sdfr#include <sys/linker.h> 4140159Speter#include <sys/fcntl.h> 4240159Speter#include <sys/libkern.h> 4340159Speter#include <sys/namei.h> 4440159Speter#include <sys/vnode.h> 4540159Speter#include <sys/sysctl.h> 4625537Sdfr 4754655Seivind 4859603Sdfr#include "linker_if.h" 4959603Sdfr 5040961Speter#ifdef KLD_DEBUG 5140961Speterint kld_debug = 0; 5240961Speter#endif 5340961Speter 5459751Speterstatic char *linker_search_path(const char *name); 5559751Speterstatic const char *linker_basename(const char* path); 5659751Speter 5759751SpeterMALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 5859751Speter 5940906Speterlinker_file_t linker_kernel_file; 6031324Sbde 6125537Sdfrstatic struct lock lock; /* lock for the file list */ 6225537Sdfrstatic linker_class_list_t classes; 6350068Sgrogstatic linker_file_list_t linker_files; 6425537Sdfrstatic int next_file_id = 1; 6525537Sdfr 6659751Speter/* XXX wrong name; we're looking at version provision tags here, not modules */ 6760938Sjaketypedef TAILQ_HEAD(, modlist) modlisthead_t; 6859751Speterstruct modlist { 6960938Sjake TAILQ_ENTRY(modlist) link; /* chain together all modules */ 7059751Speter linker_file_t container; 7159751Speter const char *name; 7259751Speter}; 7359751Spetertypedef struct modlist *modlist_t; 7459751Speterstatic modlisthead_t found_modules; 7559751Speter 7659603Sdfrstatic char * 7759603Sdfrlinker_strdup(const char *str) 7859603Sdfr{ 7959603Sdfr char *result; 8059603Sdfr 8159603Sdfr if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 8259603Sdfr strcpy(result, str); 8359603Sdfr return(result); 8459603Sdfr} 8559603Sdfr 8625537Sdfrstatic void 8725537Sdfrlinker_init(void* arg) 8825537Sdfr{ 8925537Sdfr lockinit(&lock, PVM, "klink", 0, 0); 9025537Sdfr TAILQ_INIT(&classes); 9150068Sgrog TAILQ_INIT(&linker_files); 9225537Sdfr} 9325537Sdfr 9440159SpeterSYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0); 9525537Sdfr 9625537Sdfrint 9759603Sdfrlinker_add_class(linker_class_t lc) 9825537Sdfr{ 9959603Sdfr kobj_class_compile((kobj_class_t) lc); 10059751Speter TAILQ_INSERT_TAIL(&classes, lc, link); 10125537Sdfr return 0; 10225537Sdfr} 10325537Sdfr 10425537Sdfrstatic void 10525537Sdfrlinker_file_sysinit(linker_file_t lf) 10625537Sdfr{ 10725537Sdfr struct linker_set* sysinits; 10825537Sdfr struct sysinit** sipp; 10925537Sdfr struct sysinit** xipp; 11025537Sdfr struct sysinit* save; 11125537Sdfr 11225537Sdfr KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 11325537Sdfr lf->filename)); 11425537Sdfr 11525537Sdfr sysinits = (struct linker_set*) 11625537Sdfr linker_file_lookup_symbol(lf, "sysinit_set", 0); 11740159Speter 11840159Speter KLD_DPF(FILE, ("linker_file_sysinit: SYSINITs %p\n", sysinits)); 11925537Sdfr if (!sysinits) 12025537Sdfr return; 12125537Sdfr /* 12225537Sdfr * Perform a bubble sort of the system initialization objects by 12325537Sdfr * their subsystem (primary key) and order (secondary key). 12425537Sdfr * 12525537Sdfr * Since some things care about execution order, this is the 12625537Sdfr * operation which ensures continued function. 12725537Sdfr */ 12841055Speter for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 12941055Speter for (xipp = sipp + 1; *xipp; xipp++) { 13062860Sbp if ((*sipp)->subsystem < (*xipp)->subsystem || 13141055Speter ((*sipp)->subsystem == (*xipp)->subsystem && 13241055Speter (*sipp)->order <= (*xipp)->order)) 13325537Sdfr continue; /* skip*/ 13425537Sdfr save = *sipp; 13525537Sdfr *sipp = *xipp; 13625537Sdfr *xipp = save; 13725537Sdfr } 13825537Sdfr } 13925537Sdfr 14025537Sdfr 14125537Sdfr /* 14225537Sdfr * Traverse the (now) ordered list of system initialization tasks. 14325537Sdfr * Perform each task, and continue on to the next task. 14425537Sdfr */ 14541055Speter for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 14641055Speter if ((*sipp)->subsystem == SI_SUB_DUMMY) 14725537Sdfr continue; /* skip dummy task(s)*/ 14825537Sdfr 14948391Speter /* Call function */ 15048391Speter (*((*sipp)->func))((*sipp)->udata); 15125537Sdfr } 15225537Sdfr} 15325537Sdfr 15441055Speterstatic void 15541055Speterlinker_file_sysuninit(linker_file_t lf) 15641055Speter{ 15741055Speter struct linker_set* sysuninits; 15841055Speter struct sysinit** sipp; 15941055Speter struct sysinit** xipp; 16041055Speter struct sysinit* save; 16141055Speter 16241055Speter KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 16341055Speter lf->filename)); 16441055Speter 16541055Speter sysuninits = (struct linker_set*) 16641055Speter linker_file_lookup_symbol(lf, "sysuninit_set", 0); 16741055Speter 16841055Speter KLD_DPF(FILE, ("linker_file_sysuninit: SYSUNINITs %p\n", sysuninits)); 16941055Speter if (!sysuninits) 17041055Speter return; 17141055Speter 17241055Speter /* 17341055Speter * Perform a reverse bubble sort of the system initialization objects 17441055Speter * by their subsystem (primary key) and order (secondary key). 17541055Speter * 17641055Speter * Since some things care about execution order, this is the 17741055Speter * operation which ensures continued function. 17841055Speter */ 17941055Speter for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) { 18041055Speter for (xipp = sipp + 1; *xipp; xipp++) { 18162860Sbp if ((*sipp)->subsystem > (*xipp)->subsystem || 18241055Speter ((*sipp)->subsystem == (*xipp)->subsystem && 18341055Speter (*sipp)->order >= (*xipp)->order)) 18441055Speter continue; /* skip*/ 18541055Speter save = *sipp; 18641055Speter *sipp = *xipp; 18741055Speter *xipp = save; 18841055Speter } 18941055Speter } 19041055Speter 19141055Speter /* 19241055Speter * Traverse the (now) ordered list of system initialization tasks. 19341055Speter * Perform each task, and continue on to the next task. 19441055Speter */ 19541055Speter for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) { 19641055Speter if ((*sipp)->subsystem == SI_SUB_DUMMY) 19741055Speter continue; /* skip dummy task(s)*/ 19841055Speter 19948391Speter /* Call function */ 20048391Speter (*((*sipp)->func))((*sipp)->udata); 20141055Speter } 20241055Speter} 20341055Speter 20444078Sdfrstatic void 20544078Sdfrlinker_file_register_sysctls(linker_file_t lf) 20644078Sdfr{ 20744078Sdfr struct linker_set* sysctls; 20844078Sdfr 20944078Sdfr KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 21044078Sdfr lf->filename)); 21144078Sdfr 21244078Sdfr sysctls = (struct linker_set*) 21344078Sdfr linker_file_lookup_symbol(lf, "sysctl_set", 0); 21444078Sdfr 21544078Sdfr KLD_DPF(FILE, ("linker_file_register_sysctls: SYSCTLs %p\n", sysctls)); 21644078Sdfr if (!sysctls) 21744078Sdfr return; 21844078Sdfr 21944078Sdfr sysctl_register_set(sysctls); 22044078Sdfr} 22144078Sdfr 22244078Sdfrstatic void 22344078Sdfrlinker_file_unregister_sysctls(linker_file_t lf) 22444078Sdfr{ 22544078Sdfr struct linker_set* sysctls; 22644078Sdfr 22744078Sdfr KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n", 22844078Sdfr lf->filename)); 22944078Sdfr 23044078Sdfr sysctls = (struct linker_set*) 23144078Sdfr linker_file_lookup_symbol(lf, "sysctl_set", 0); 23244078Sdfr 23344078Sdfr KLD_DPF(FILE, ("linker_file_unregister_sysctls: SYSCTLs %p\n", sysctls)); 23444078Sdfr if (!sysctls) 23544078Sdfr return; 23644078Sdfr 23744078Sdfr sysctl_unregister_set(sysctls); 23844078Sdfr} 23944078Sdfr 24066630Sdfrextern struct linker_set modmetadata_set; 24166630Sdfr 24259751Speterstatic int 24359751Speterlinker_file_register_modules(linker_file_t lf) 24459751Speter{ 24574639Sbp int error; 24659751Speter struct linker_set *modules; 24759751Speter struct mod_metadata **mdpp; 24859751Speter const moduledata_t *moddata; 24959751Speter 25059751Speter KLD_DPF(FILE, ("linker_file_register_modules: registering modules in %s\n", 25159751Speter lf->filename)); 25259751Speter 25359751Speter modules = (struct linker_set*) 25459751Speter linker_file_lookup_symbol(lf, "modmetadata_set", 0); 25566630Sdfr 25666630Sdfr if (!modules && lf == linker_kernel_file) 25766630Sdfr modules = &modmetadata_set; 25866630Sdfr 25974639Sbp if (modules == NULL) 26074639Sbp return 0; 26174639Sbp for (mdpp = (struct mod_metadata**)modules->ls_items; *mdpp; mdpp++) { 26274639Sbp if ((*mdpp)->md_type != MDT_MODULE) 26374639Sbp continue; 26474639Sbp moddata = (*mdpp)->md_data; 26574639Sbp KLD_DPF(FILE, ("Registering module %s in %s\n", 26674639Sbp moddata->name, lf->filename)); 26774639Sbp if (module_lookupbyname(moddata->name) != NULL) { 26874639Sbp printf("Warning: module %s already exists\n", moddata->name); 26974639Sbp continue; /* or return a error ? */ 27059751Speter } 27174639Sbp error = module_register(moddata, lf); 27274639Sbp if (error) 27374639Sbp printf("Module %s failed to register: %d\n", moddata->name, error); 27459751Speter } 27574639Sbp return 0; 27659751Speter} 27759751Speter 27859751Speterstatic void 27959751Speterlinker_init_kernel_modules(void) 28059751Speter{ 28159751Speter linker_file_register_modules(linker_kernel_file); 28259751Speter} 28359751Speter 28459751SpeterSYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0); 28559751Speter 28625537Sdfrint 28725537Sdfrlinker_load_file(const char* filename, linker_file_t* result) 28825537Sdfr{ 28925537Sdfr linker_class_t lc; 29025537Sdfr linker_file_t lf; 29142755Speter int foundfile, error = 0; 29225537Sdfr 29362261Sarchie /* Refuse to load modules if securelevel raised */ 29462261Sarchie if (securelevel > 0) 29562261Sarchie return EPERM; 29662261Sarchie 29725537Sdfr lf = linker_find_file_by_name(filename); 29825537Sdfr if (lf) { 29925537Sdfr KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename)); 30025537Sdfr *result = lf; 30125537Sdfr lf->refs++; 30225537Sdfr goto out; 30325537Sdfr } 30425537Sdfr 30525537Sdfr lf = NULL; 30642755Speter foundfile = 0; 30771999Sphk TAILQ_FOREACH(lc, &classes, link) { 30825537Sdfr KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n", 30925537Sdfr filename, lc->desc)); 31059751Speter error = LINKER_LOAD_FILE(lc, filename, &lf); 31142755Speter /* 31242755Speter * If we got something other than ENOENT, then it exists but we cannot 31342755Speter * load it for some other reason. 31442755Speter */ 31542755Speter if (error != ENOENT) 31642755Speter foundfile = 1; 31725537Sdfr if (lf) { 31859751Speter linker_file_register_modules(lf); 31944549Sdfr linker_file_register_sysctls(lf); 32025537Sdfr linker_file_sysinit(lf); 32159751Speter lf->flags |= LINKER_FILE_LINKED; 32225537Sdfr 32325537Sdfr *result = lf; 32440861Speter error = 0; 32525537Sdfr goto out; 32625537Sdfr } 32725537Sdfr } 32842755Speter /* 32942755Speter * Less than ideal, but tells the user whether it failed to load or 33042755Speter * the module was not found. 33142755Speter */ 33242755Speter if (foundfile) 33342755Speter error = ENOEXEC; /* Format not recognised (or unloadable) */ 33442755Speter else 33542755Speter error = ENOENT; /* Nothing found */ 33625537Sdfr 33725537Sdfrout: 33825537Sdfr return error; 33925537Sdfr} 34025537Sdfr 34125537Sdfrlinker_file_t 34225537Sdfrlinker_find_file_by_name(const char* filename) 34325537Sdfr{ 34425537Sdfr linker_file_t lf = 0; 34540861Speter char *koname; 34625537Sdfr 34740861Speter koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 34840861Speter if (koname == NULL) 34940861Speter goto out; 35040861Speter sprintf(koname, "%s.ko", filename); 35140861Speter 35225537Sdfr lockmgr(&lock, LK_SHARED, 0, curproc); 35371999Sphk TAILQ_FOREACH(lf, &linker_files, link) { 35440861Speter if (!strcmp(lf->filename, koname)) 35540861Speter break; 35625537Sdfr if (!strcmp(lf->filename, filename)) 35725537Sdfr break; 35840861Speter } 35925537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 36025537Sdfr 36140861Speterout: 36240861Speter if (koname) 36340861Speter free(koname, M_LINKER); 36425537Sdfr return lf; 36525537Sdfr} 36625537Sdfr 36725537Sdfrlinker_file_t 36825537Sdfrlinker_find_file_by_id(int fileid) 36925537Sdfr{ 37025537Sdfr linker_file_t lf = 0; 37125537Sdfr 37225537Sdfr lockmgr(&lock, LK_SHARED, 0, curproc); 37371999Sphk TAILQ_FOREACH(lf, &linker_files, link) 37425537Sdfr if (lf->id == fileid) 37525537Sdfr break; 37625537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 37725537Sdfr 37825537Sdfr return lf; 37925537Sdfr} 38025537Sdfr 38125537Sdfrlinker_file_t 38259603Sdfrlinker_make_file(const char* pathname, linker_class_t lc) 38325537Sdfr{ 38425537Sdfr linker_file_t lf = 0; 38540159Speter const char *filename; 38625537Sdfr 38759751Speter filename = linker_basename(pathname); 38840159Speter 38925537Sdfr KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 39045356Speter lockmgr(&lock, LK_EXCLUSIVE, 0, curproc); 39159603Sdfr lf = (linker_file_t) kobj_create((kobj_class_t) lc, M_LINKER, M_WAITOK); 39225537Sdfr if (!lf) 39325537Sdfr goto out; 39425537Sdfr 39525537Sdfr lf->refs = 1; 39625537Sdfr lf->userrefs = 0; 39743185Sdfr lf->flags = 0; 39859603Sdfr lf->filename = linker_strdup(filename); 39925537Sdfr lf->id = next_file_id++; 40025537Sdfr lf->ndeps = 0; 40125537Sdfr lf->deps = NULL; 40225537Sdfr STAILQ_INIT(&lf->common); 40325537Sdfr TAILQ_INIT(&lf->modules); 40425537Sdfr 40550068Sgrog TAILQ_INSERT_TAIL(&linker_files, lf, link); 40625537Sdfr 40725537Sdfrout: 40825537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 40925537Sdfr return lf; 41025537Sdfr} 41125537Sdfr 41225537Sdfrint 41325537Sdfrlinker_file_unload(linker_file_t file) 41425537Sdfr{ 41525537Sdfr module_t mod, next; 41659751Speter modlist_t ml, nextml; 41725537Sdfr struct common_symbol* cp; 41825537Sdfr int error = 0; 41925537Sdfr int i; 42025537Sdfr 42162261Sarchie /* Refuse to unload modules if securelevel raised */ 42262261Sarchie if (securelevel > 0) 42362261Sarchie return EPERM; 42462261Sarchie 42540159Speter KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 42645356Speter lockmgr(&lock, LK_EXCLUSIVE, 0, curproc); 42725537Sdfr if (file->refs == 1) { 42825537Sdfr KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n")); 42925537Sdfr /* 43025537Sdfr * Inform any modules associated with this file. 43125537Sdfr */ 43225537Sdfr for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 43325537Sdfr next = module_getfnext(mod); 43425537Sdfr 43525537Sdfr /* 43625537Sdfr * Give the module a chance to veto the unload. 43725537Sdfr */ 43843301Sdillon if ((error = module_unload(mod)) != 0) { 43925537Sdfr KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n", 44025537Sdfr mod)); 44125537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 44225537Sdfr goto out; 44325537Sdfr } 44425537Sdfr 44525537Sdfr module_release(mod); 44625537Sdfr } 44725537Sdfr } 44825537Sdfr 44925537Sdfr file->refs--; 45025537Sdfr if (file->refs > 0) { 45125537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 45225537Sdfr goto out; 45325537Sdfr } 45425537Sdfr 45559751Speter for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) { 45659751Speter nextml = TAILQ_NEXT(ml, link); 45759751Speter if (ml->container == file) { 45859751Speter TAILQ_REMOVE(&found_modules, ml, link); 45959751Speter } 46059751Speter } 46159751Speter 46243185Sdfr /* Don't try to run SYSUNINITs if we are unloaded due to a link error */ 46344078Sdfr if (file->flags & LINKER_FILE_LINKED) { 46443185Sdfr linker_file_sysuninit(file); 46544078Sdfr linker_file_unregister_sysctls(file); 46644078Sdfr } 46741055Speter 46850068Sgrog TAILQ_REMOVE(&linker_files, file, link); 46925537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 47040159Speter 47159751Speter if (file->deps) { 47259751Speter for (i = 0; i < file->ndeps; i++) 47359751Speter linker_file_unload(file->deps[i]); 47459751Speter free(file->deps, M_LINKER); 47559751Speter file->deps = NULL; 47659751Speter } 47725537Sdfr 47825537Sdfr for (cp = STAILQ_FIRST(&file->common); cp; 47925537Sdfr cp = STAILQ_FIRST(&file->common)) { 48060938Sjake STAILQ_REMOVE(&file->common, cp, common_symbol, link); 48125537Sdfr free(cp, M_LINKER); 48225537Sdfr } 48325537Sdfr 48459603Sdfr LINKER_UNLOAD(file); 48559751Speter if (file->filename) { 48659751Speter free(file->filename, M_LINKER); 48759751Speter file->filename = NULL; 48859751Speter } 48959603Sdfr kobj_delete((kobj_t) file, M_LINKER); 49025537Sdfr 49125537Sdfrout: 49225537Sdfr return error; 49325537Sdfr} 49425537Sdfr 49525537Sdfrint 49625537Sdfrlinker_file_add_dependancy(linker_file_t file, linker_file_t dep) 49725537Sdfr{ 49825537Sdfr linker_file_t* newdeps; 49925537Sdfr 50025537Sdfr newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*), 50169781Sdwmalone M_LINKER, M_WAITOK | M_ZERO); 50225537Sdfr if (newdeps == NULL) 50325537Sdfr return ENOMEM; 50425537Sdfr 50525537Sdfr if (file->deps) { 50625537Sdfr bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*)); 50725537Sdfr free(file->deps, M_LINKER); 50825537Sdfr } 50925537Sdfr file->deps = newdeps; 51025537Sdfr file->deps[file->ndeps] = dep; 51125537Sdfr file->ndeps++; 51225537Sdfr 51325537Sdfr return 0; 51425537Sdfr} 51525537Sdfr 51625537Sdfrcaddr_t 51725537Sdfrlinker_file_lookup_symbol(linker_file_t file, const char* name, int deps) 51825537Sdfr{ 51943309Sdillon c_linker_sym_t sym; 52038275Sdfr linker_symval_t symval; 52125537Sdfr caddr_t address; 52225537Sdfr size_t common_size = 0; 52325537Sdfr int i; 52425537Sdfr 52540159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n", 52625537Sdfr file, name, deps)); 52725537Sdfr 52859603Sdfr if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 52959603Sdfr LINKER_SYMBOL_VALUES(file, sym, &symval); 53038275Sdfr if (symval.value == 0) 53125537Sdfr /* 53225537Sdfr * For commons, first look them up in the dependancies and 53325537Sdfr * only allocate space if not found there. 53425537Sdfr */ 53538275Sdfr common_size = symval.size; 53640159Speter else { 53740159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value)); 53838275Sdfr return symval.value; 53940159Speter } 54038275Sdfr } 54125537Sdfr 54242849Speter if (deps) { 54325537Sdfr for (i = 0; i < file->ndeps; i++) { 54425537Sdfr address = linker_file_lookup_symbol(file->deps[i], name, 0); 54540159Speter if (address) { 54640159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", address)); 54725537Sdfr return address; 54840159Speter } 54925537Sdfr } 55042849Speter } 55142849Speter 55225537Sdfr if (common_size > 0) { 55325537Sdfr /* 55425537Sdfr * This is a common symbol which was not found in the 55525537Sdfr * dependancies. We maintain a simple common symbol table in 55625537Sdfr * the file object. 55725537Sdfr */ 55825537Sdfr struct common_symbol* cp; 55925537Sdfr 56072012Sphk STAILQ_FOREACH(cp, &file->common, link) 56140159Speter if (!strcmp(cp->name, name)) { 56240159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address)); 56325537Sdfr return cp->address; 56440159Speter } 56525537Sdfr 56625537Sdfr /* 56725537Sdfr * Round the symbol size up to align. 56825537Sdfr */ 56925537Sdfr common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 57025537Sdfr cp = malloc(sizeof(struct common_symbol) 57125537Sdfr + common_size 57225537Sdfr + strlen(name) + 1, 57369781Sdwmalone M_LINKER, M_WAITOK | M_ZERO); 57440159Speter if (!cp) { 57540159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 57625537Sdfr return 0; 57740159Speter } 57825537Sdfr 57925537Sdfr cp->address = (caddr_t) (cp + 1); 58025537Sdfr cp->name = cp->address + common_size; 58125537Sdfr strcpy(cp->name, name); 58225537Sdfr bzero(cp->address, common_size); 58325537Sdfr STAILQ_INSERT_TAIL(&file->common, cp, link); 58425537Sdfr 58540159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address)); 58625537Sdfr return cp->address; 58725537Sdfr } 58825537Sdfr 58940159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 59025537Sdfr return 0; 59125537Sdfr} 59225537Sdfr 59340159Speter#ifdef DDB 59425537Sdfr/* 59540159Speter * DDB Helpers. DDB has to look across multiple files with their own 59640159Speter * symbol tables and string tables. 59740159Speter * 59840159Speter * Note that we do not obey list locking protocols here. We really don't 59940159Speter * need DDB to hang because somebody's got the lock held. We'll take the 60040159Speter * chance that the files list is inconsistant instead. 60140159Speter */ 60240159Speter 60340159Speterint 60443309Sdillonlinker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 60540159Speter{ 60640159Speter linker_file_t lf; 60740159Speter 60871999Sphk TAILQ_FOREACH(lf, &linker_files, link) { 60959603Sdfr if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 61040159Speter return 0; 61140159Speter } 61240159Speter return ENOENT; 61340159Speter} 61440159Speter 61540159Speterint 61643309Sdillonlinker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 61740159Speter{ 61840159Speter linker_file_t lf; 61950272Sbde u_long off = (uintptr_t)value; 62040159Speter u_long diff, bestdiff; 62143309Sdillon c_linker_sym_t best; 62243309Sdillon c_linker_sym_t es; 62340159Speter 62440159Speter best = 0; 62540159Speter bestdiff = off; 62671999Sphk TAILQ_FOREACH(lf, &linker_files, link) { 62759603Sdfr if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 62840159Speter continue; 62940159Speter if (es != 0 && diff < bestdiff) { 63040159Speter best = es; 63140159Speter bestdiff = diff; 63240159Speter } 63340159Speter if (bestdiff == 0) 63440159Speter break; 63540159Speter } 63640159Speter if (best) { 63740159Speter *sym = best; 63840159Speter *diffp = bestdiff; 63940159Speter return 0; 64040159Speter } else { 64140159Speter *sym = 0; 64240159Speter *diffp = off; 64340159Speter return ENOENT; 64440159Speter } 64540159Speter} 64640159Speter 64740159Speterint 64843309Sdillonlinker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 64940159Speter{ 65040159Speter linker_file_t lf; 65140159Speter 65271999Sphk TAILQ_FOREACH(lf, &linker_files, link) { 65359603Sdfr if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 65440159Speter return 0; 65540159Speter } 65640159Speter return ENOENT; 65740159Speter} 65840159Speter 65940159Speter#endif 66040159Speter 66140159Speter/* 66225537Sdfr * Syscalls. 66325537Sdfr */ 66425537Sdfr 66525537Sdfrint 66630994Sphkkldload(struct proc* p, struct kldload_args* uap) 66725537Sdfr{ 66859751Speter char* pathname, *realpath; 66959751Speter const char *filename; 67025537Sdfr linker_file_t lf; 67125537Sdfr int error = 0; 67225537Sdfr 67330994Sphk p->p_retval[0] = -1; 67425537Sdfr 67562261Sarchie if (securelevel > 0) /* redundant, but that's OK */ 67625537Sdfr return EPERM; 67725537Sdfr 67846112Sphk if ((error = suser(p)) != 0) 67925537Sdfr return error; 68025537Sdfr 68159751Speter realpath = NULL; 68259751Speter pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 68359751Speter if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, NULL)) != 0) 68425537Sdfr goto out; 68525537Sdfr 68659751Speter realpath = linker_search_path(pathname); 68759751Speter if (realpath == NULL) { 68859751Speter error = ENOENT; 68959751Speter goto out; 69059751Speter } 69159751Speter /* Can't load more than one file with the same name */ 69259751Speter filename = linker_basename(realpath); 69359751Speter if (linker_find_file_by_name(filename)) { 69442316Smsmith error = EEXIST; 69542316Smsmith goto out; 69642316Smsmith } 69742316Smsmith 69859751Speter if ((error = linker_load_file(realpath, &lf)) != 0) 69925537Sdfr goto out; 70025537Sdfr 70125537Sdfr lf->userrefs++; 70230994Sphk p->p_retval[0] = lf->id; 70340159Speter 70425537Sdfrout: 70559751Speter if (pathname) 70659751Speter free(pathname, M_TEMP); 70759751Speter if (realpath) 70859751Speter free(realpath, M_LINKER); 70925537Sdfr return error; 71025537Sdfr} 71125537Sdfr 71225537Sdfrint 71330994Sphkkldunload(struct proc* p, struct kldunload_args* uap) 71425537Sdfr{ 71525537Sdfr linker_file_t lf; 71625537Sdfr int error = 0; 71725537Sdfr 71862261Sarchie if (securelevel > 0) /* redundant, but that's OK */ 71925537Sdfr return EPERM; 72025537Sdfr 72146112Sphk if ((error = suser(p)) != 0) 72225537Sdfr return error; 72325537Sdfr 72425537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 72525537Sdfr if (lf) { 72625537Sdfr KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 72725537Sdfr if (lf->userrefs == 0) { 72859751Speter printf("kldunload: attempt to unload file that was loaded by the kernel\n"); 72925537Sdfr error = EBUSY; 73025537Sdfr goto out; 73125537Sdfr } 73243084Speter lf->userrefs--; 73342837Speter error = linker_file_unload(lf); 73442837Speter if (error) 73543084Speter lf->userrefs++; 73625537Sdfr } else 73725537Sdfr error = ENOENT; 73825537Sdfr 73925537Sdfrout: 74025537Sdfr return error; 74125537Sdfr} 74225537Sdfr 74325537Sdfrint 74430994Sphkkldfind(struct proc* p, struct kldfind_args* uap) 74525537Sdfr{ 74659751Speter char* pathname; 74759751Speter const char *filename; 74825537Sdfr linker_file_t lf; 74925537Sdfr int error = 0; 75025537Sdfr 75130994Sphk p->p_retval[0] = -1; 75225537Sdfr 75359751Speter pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 75459751Speter if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, NULL)) != 0) 75525537Sdfr goto out; 75625537Sdfr 75759751Speter filename = linker_basename(pathname); 75842316Smsmith 75959751Speter lf = linker_find_file_by_name(filename); 76025537Sdfr if (lf) 76130994Sphk p->p_retval[0] = lf->id; 76225537Sdfr else 76325537Sdfr error = ENOENT; 76440159Speter 76525537Sdfrout: 76659751Speter if (pathname) 76759751Speter free(pathname, M_TEMP); 76825537Sdfr return error; 76925537Sdfr} 77025537Sdfr 77125537Sdfrint 77230994Sphkkldnext(struct proc* p, struct kldnext_args* uap) 77325537Sdfr{ 77425537Sdfr linker_file_t lf; 77525537Sdfr int error = 0; 77625537Sdfr 77725537Sdfr if (SCARG(uap, fileid) == 0) { 77850068Sgrog if (TAILQ_FIRST(&linker_files)) 77950068Sgrog p->p_retval[0] = TAILQ_FIRST(&linker_files)->id; 78025537Sdfr else 78130994Sphk p->p_retval[0] = 0; 78225537Sdfr return 0; 78325537Sdfr } 78440159Speter 78525537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 78625537Sdfr if (lf) { 78725537Sdfr if (TAILQ_NEXT(lf, link)) 78830994Sphk p->p_retval[0] = TAILQ_NEXT(lf, link)->id; 78925537Sdfr else 79030994Sphk p->p_retval[0] = 0; 79125537Sdfr } else 79225537Sdfr error = ENOENT; 79325537Sdfr 79425537Sdfr return error; 79525537Sdfr} 79625537Sdfr 79725537Sdfrint 79830994Sphkkldstat(struct proc* p, struct kldstat_args* uap) 79925537Sdfr{ 80025537Sdfr linker_file_t lf; 80125537Sdfr int error = 0; 80225537Sdfr int version; 80325537Sdfr struct kld_file_stat* stat; 80425537Sdfr int namelen; 80525537Sdfr 80625537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 80725537Sdfr if (!lf) { 80825537Sdfr error = ENOENT; 80925537Sdfr goto out; 81025537Sdfr } 81125537Sdfr 81225537Sdfr stat = SCARG(uap, stat); 81325537Sdfr 81425537Sdfr /* 81525537Sdfr * Check the version of the user's structure. 81625537Sdfr */ 81743301Sdillon if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 81825537Sdfr goto out; 81925537Sdfr if (version != sizeof(struct kld_file_stat)) { 82025537Sdfr error = EINVAL; 82125537Sdfr goto out; 82225537Sdfr } 82325537Sdfr 82425537Sdfr namelen = strlen(lf->filename) + 1; 82525537Sdfr if (namelen > MAXPATHLEN) 82625537Sdfr namelen = MAXPATHLEN; 82743301Sdillon if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 82825537Sdfr goto out; 82943301Sdillon if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 83025537Sdfr goto out; 83143301Sdillon if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 83225537Sdfr goto out; 83343301Sdillon if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) 83425537Sdfr goto out; 83543301Sdillon if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 83625537Sdfr goto out; 83725537Sdfr 83830994Sphk p->p_retval[0] = 0; 83925537Sdfr 84025537Sdfrout: 84125537Sdfr return error; 84225537Sdfr} 84325537Sdfr 84425537Sdfrint 84530994Sphkkldfirstmod(struct proc* p, struct kldfirstmod_args* uap) 84625537Sdfr{ 84725537Sdfr linker_file_t lf; 84825537Sdfr int error = 0; 84925537Sdfr 85025537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 85125537Sdfr if (lf) { 85225537Sdfr if (TAILQ_FIRST(&lf->modules)) 85330994Sphk p->p_retval[0] = module_getid(TAILQ_FIRST(&lf->modules)); 85425537Sdfr else 85530994Sphk p->p_retval[0] = 0; 85625537Sdfr } else 85725537Sdfr error = ENOENT; 85825537Sdfr 85925537Sdfr return error; 86025537Sdfr} 86140159Speter 86241090Speterint 86341090Speterkldsym(struct proc *p, struct kldsym_args *uap) 86441090Speter{ 86541090Speter char *symstr = NULL; 86643309Sdillon c_linker_sym_t sym; 86741090Speter linker_symval_t symval; 86841090Speter linker_file_t lf; 86941090Speter struct kld_sym_lookup lookup; 87041090Speter int error = 0; 87141090Speter 87243301Sdillon if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0) 87341090Speter goto out; 87441090Speter if (lookup.version != sizeof(lookup) || SCARG(uap, cmd) != KLDSYM_LOOKUP) { 87541090Speter error = EINVAL; 87641090Speter goto out; 87741090Speter } 87841090Speter 87941090Speter symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 88043301Sdillon if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 88141090Speter goto out; 88241090Speter 88341090Speter if (SCARG(uap, fileid) != 0) { 88441090Speter lf = linker_find_file_by_id(SCARG(uap, fileid)); 88541090Speter if (lf == NULL) { 88641090Speter error = ENOENT; 88741090Speter goto out; 88841090Speter } 88959603Sdfr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 89059603Sdfr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 89150272Sbde lookup.symvalue = (uintptr_t)symval.value; 89241090Speter lookup.symsize = symval.size; 89341090Speter error = copyout(&lookup, SCARG(uap, data), sizeof(lookup)); 89441090Speter } else 89541090Speter error = ENOENT; 89641090Speter } else { 89771999Sphk TAILQ_FOREACH(lf, &linker_files, link) { 89859603Sdfr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 89959603Sdfr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 90050272Sbde lookup.symvalue = (uintptr_t)symval.value; 90141090Speter lookup.symsize = symval.size; 90241090Speter error = copyout(&lookup, SCARG(uap, data), sizeof(lookup)); 90341090Speter break; 90441090Speter } 90541090Speter } 90641090Speter if (!lf) 90741090Speter error = ENOENT; 90841090Speter } 90941090Speterout: 91041090Speter if (symstr) 91141090Speter free(symstr, M_TEMP); 91241090Speter return error; 91341090Speter} 91441090Speter 91540159Speter/* 91640159Speter * Preloaded module support 91740159Speter */ 91840159Speter 91959751Speterstatic modlist_t 92059751Spetermodlist_lookup(const char *name) 92159751Speter{ 92259751Speter modlist_t mod; 92359751Speter 92471999Sphk TAILQ_FOREACH(mod, &found_modules, link) { 92559751Speter if (!strcmp(mod->name, name)) 92659751Speter return mod; 92759751Speter } 92859751Speter return NULL; 92959751Speter} 93059751Speter 93159751Speter/* 93259751Speter * This routine is cheap and nasty but will work for data pointers. 93359751Speter */ 93459751Speterstatic void * 93559751Speterlinker_reloc_ptr(linker_file_t lf, void *offset) 93659751Speter{ 93759751Speter return lf->address + (uintptr_t)offset; 93859751Speter} 93959751Speter 94040159Speterstatic void 94140159Speterlinker_preload(void* arg) 94240159Speter{ 94340159Speter caddr_t modptr; 94464143Speter char *modname, *nmodname; 94540162Speter char *modtype; 94640159Speter linker_file_t lf; 94740159Speter linker_class_t lc; 94874639Sbp int error; 94940159Speter struct linker_set *sysinits; 95059751Speter linker_file_list_t loaded_files; 95159751Speter linker_file_list_t depended_files; 95259751Speter struct linker_set *deps; 95364143Speter struct mod_metadata *mp, *nmp; 95464143Speter int i, j; 95559751Speter int resolves; 95659751Speter modlist_t mod; 95740159Speter 95859751Speter TAILQ_INIT(&loaded_files); 95959751Speter TAILQ_INIT(&depended_files); 96059751Speter TAILQ_INIT(&found_modules); 96159751Speter error = 0; 96259751Speter 96340159Speter modptr = NULL; 96440159Speter while ((modptr = preload_search_next_name(modptr)) != NULL) { 96540159Speter modname = (char *)preload_search_info(modptr, MODINFO_NAME); 96640162Speter modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 96740159Speter if (modname == NULL) { 96840625Smsmith printf("Preloaded module at %p does not have a name!\n", modptr); 96940159Speter continue; 97040159Speter } 97140162Speter if (modtype == NULL) { 97240625Smsmith printf("Preloaded module at %p does not have a type!\n", modptr); 97340162Speter continue; 97440162Speter } 97540625Smsmith printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); 97640159Speter lf = NULL; 97771999Sphk TAILQ_FOREACH(lc, &classes, link) { 97859751Speter error = LINKER_LINK_PRELOAD(lc, modname, &lf); 97940159Speter if (error) { 98040159Speter lf = NULL; 98140159Speter break; 98240159Speter } 98340159Speter } 98459751Speter if (lf) 98559751Speter TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 98659751Speter } 98740159Speter 98859751Speter /* 98959751Speter * First get a list of stuff in the kernel. 99059751Speter */ 99159751Speter deps = (struct linker_set*) 99259751Speter linker_file_lookup_symbol(linker_kernel_file, MDT_SETNAME, 0); 99359751Speter if (deps) { 99459751Speter for (i = 0; i < deps->ls_length; i++) { 99559751Speter mp = deps->ls_items[i]; 99659751Speter if (mp->md_type != MDT_VERSION) 99759751Speter continue; 99859751Speter modname = mp->md_cval; 99959751Speter if (modlist_lookup(modname) != NULL) { 100059751Speter printf("module %s already present!\n", modname); 100159751Speter /* XXX what can we do? this is a build error. :-( */ 100259751Speter continue; 100359751Speter } 100469781Sdwmalone mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT|M_ZERO); 100559751Speter if (mod == NULL) 100659751Speter panic("no memory for module list"); 100759751Speter mod->container = linker_kernel_file; 100859751Speter mod->name = modname; 100959751Speter TAILQ_INSERT_TAIL(&found_modules, mod, link); 101059751Speter } 101159751Speter } 101259751Speter 101359751Speter /* 101459751Speter * this is a once-off kinky bubble sort 101559751Speter * resolve relocation dependency requirements 101659751Speter */ 101759751Speterrestart: 101871999Sphk TAILQ_FOREACH(lf, &loaded_files, loaded) { 101959751Speter deps = (struct linker_set*) 102059751Speter linker_file_lookup_symbol(lf, MDT_SETNAME, 0); 102159751Speter /* 102259751Speter * First, look to see if we would successfully link with this stuff. 102359751Speter */ 102459751Speter resolves = 1; /* unless we know otherwise */ 102559751Speter if (deps) { 102659751Speter for (i = 0; i < deps->ls_length; i++) { 102759751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 102859751Speter if (mp->md_type != MDT_DEPEND) 102959751Speter continue; 103059751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 103164143Speter for (j = 0; j < deps->ls_length; j++) { 103264143Speter nmp = linker_reloc_ptr(lf, deps->ls_items[j]); 103364143Speter if (nmp->md_type != MDT_VERSION) 103464143Speter continue; 103564143Speter nmodname = linker_reloc_ptr(lf, nmp->md_cval); 103664143Speter if (strcmp(modname, nmodname) == 0) 103764143Speter break; 103864143Speter } 103964143Speter if (j < deps->ls_length) /* it's a self reference */ 104064143Speter continue; 104159751Speter if (modlist_lookup(modname) == NULL) { 104259751Speter /* ok, the module isn't here yet, we are not finished */ 104359751Speter resolves = 0; 104459751Speter } 104559751Speter } 104659751Speter } 104759751Speter /* 104859751Speter * OK, if we found our modules, we can link. So, "provide" the 104959751Speter * modules inside and add it to the end of the link order list. 105059751Speter */ 105159751Speter if (resolves) { 105259751Speter if (deps) { 105359751Speter for (i = 0; i < deps->ls_length; i++) { 105459751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 105559751Speter if (mp->md_type != MDT_VERSION) 105659751Speter continue; 105759751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 105859751Speter if (modlist_lookup(modname) != NULL) { 105959751Speter printf("module %s already present!\n", modname); 106059751Speter linker_file_unload(lf); 106159751Speter TAILQ_REMOVE(&loaded_files, lf, loaded); 106259751Speter goto restart; /* we changed the tailq next ptr */ 106340159Speter } 106469781Sdwmalone mod = malloc(sizeof(struct modlist), M_LINKER, 106569781Sdwmalone M_NOWAIT|M_ZERO); 106659751Speter if (mod == NULL) 106759751Speter panic("no memory for module list"); 106859751Speter mod->container = lf; 106959751Speter mod->name = modname; 107059751Speter TAILQ_INSERT_TAIL(&found_modules, mod, link); 107140159Speter } 107240159Speter } 107359751Speter TAILQ_REMOVE(&loaded_files, lf, loaded); 107459751Speter TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 107559751Speter /* 107659751Speter * Since we provided modules, we need to restart the sort so 107759751Speter * that the previous files that depend on us have a chance. 107859751Speter * Also, we've busted the tailq next pointer with the REMOVE. 107959751Speter */ 108059751Speter goto restart; 108140159Speter } 108240159Speter } 108359751Speter 108459751Speter /* 108559751Speter * At this point, we check to see what could not be resolved.. 108659751Speter */ 108771999Sphk TAILQ_FOREACH(lf, &loaded_files, loaded) { 108859751Speter printf("KLD file %s is missing dependencies\n", lf->filename); 108959751Speter linker_file_unload(lf); 109059751Speter TAILQ_REMOVE(&loaded_files, lf, loaded); 109159751Speter } 109259751Speter 109359751Speter /* 109459751Speter * We made it. Finish off the linking in the order we determined. 109559751Speter */ 109671999Sphk TAILQ_FOREACH(lf, &depended_files, loaded) { 109759751Speter if (linker_kernel_file) { 109859751Speter linker_kernel_file->refs++; 109959751Speter error = linker_file_add_dependancy(lf, linker_kernel_file); 110059751Speter if (error) 110159751Speter panic("cannot add dependency"); 110259751Speter } 110359751Speter lf->userrefs++; /* so we can (try to) kldunload it */ 110459751Speter deps = (struct linker_set*) 110559751Speter linker_file_lookup_symbol(lf, MDT_SETNAME, 0); 110659751Speter if (deps) { 110759751Speter for (i = 0; i < deps->ls_length; i++) { 110859751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 110959751Speter if (mp->md_type != MDT_DEPEND) 111059751Speter continue; 111159751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 111259751Speter mod = modlist_lookup(modname); 111359751Speter mod->container->refs++; 111459751Speter error = linker_file_add_dependancy(lf, mod->container); 111559751Speter if (error) 111659751Speter panic("cannot add dependency"); 111759751Speter } 111859751Speter } 111959751Speter 112059751Speter /* Now do relocation etc using the symbol search paths established by the dependencies */ 112159751Speter error = LINKER_LINK_PRELOAD_FINISH(lf); 112259751Speter if (error) { 112359751Speter printf("KLD file %s - could not finalize loading\n", lf->filename); 112459751Speter linker_file_unload(lf); 112559751Speter continue; 112659751Speter } 112759751Speter 112874639Sbp linker_file_register_modules(lf); 112959751Speter sysinits = (struct linker_set*) 113059751Speter linker_file_lookup_symbol(lf, "sysinit_set", 0); 113159751Speter if (sysinits) 113259751Speter sysinit_add((struct sysinit **)sysinits->ls_items); 113359751Speter linker_file_register_sysctls(lf); 113459751Speter lf->flags |= LINKER_FILE_LINKED; 113559751Speter } 113659751Speter /* woohoo! we made it! */ 113740159Speter} 113840159Speter 113940159SpeterSYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 114040159Speter 114140159Speter/* 114240159Speter * Search for a not-loaded module by name. 114340159Speter * 114440159Speter * Modules may be found in the following locations: 114540159Speter * 114640159Speter * - preloaded (result is just the module name) 114740159Speter * - on disk (result is full path to module) 114840159Speter * 114940159Speter * If the module name is qualified in any way (contains path, etc.) 115040159Speter * the we simply return a copy of it. 115140159Speter * 115240159Speter * The search path can be manipulated via sysctl. Note that we use the ';' 115340159Speter * character as a separator to be consistent with the bootloader. 115440159Speter */ 115540159Speter 115670417Speterstatic char def_linker_path[] = "/boot/modules/;/modules/;/boot/kernel/"; 115770417Speterstatic char linker_path[MAXPATHLEN] = ""; 115840159Speter 115940159SpeterSYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 116040159Speter sizeof(linker_path), "module load search path"); 116140159Speter 116270417SpeterTUNABLE_STR_DECL("module_path", def_linker_path, linker_path, 116370417Speter sizeof(linker_path)); 116470417Speter 116559751Speterstatic char *linker_ext_list[] = { 116659751Speter ".ko", 116759751Speter "", 116859751Speter NULL 116959751Speter}; 117059751Speter 117159751Speterstatic char * 117240159Speterlinker_search_path(const char *name) 117340159Speter{ 117440159Speter struct nameidata nd; 117540159Speter struct proc *p = curproc; /* XXX */ 117659751Speter char *cp, *ep, *result, **cpp; 117762550Smckusick int error, extlen, len, flags; 117840159Speter enum vtype type; 117940159Speter 118040159Speter /* qualified at all? */ 118154411Speter if (index(name, '/')) 118240159Speter return(linker_strdup(name)); 118340159Speter 118459751Speter extlen = 0; 118559751Speter for (cpp = linker_ext_list; *cpp; cpp++) { 118659751Speter len = strlen(*cpp); 118759751Speter if (len > extlen) 118859751Speter extlen = len; 118959751Speter } 119059751Speter extlen++; /* trailing '\0' */ 119159751Speter 119240159Speter /* traverse the linker path */ 119340159Speter cp = linker_path; 119459751Speter len = strlen(name); 119540159Speter for (;;) { 119640159Speter 119740159Speter /* find the end of this component */ 119840159Speter for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) 119940159Speter ; 120070417Speter result = malloc((len + (ep - cp) + extlen + 1), M_LINKER, M_WAITOK); 120140159Speter if (result == NULL) /* actually ENOMEM */ 120240159Speter return(NULL); 120359751Speter for (cpp = linker_ext_list; *cpp; cpp++) { 120459751Speter strncpy(result, cp, ep - cp); 120570417Speter strcpy(result + (ep - cp), "/"); 120670417Speter strcat(result, name); 120759751Speter strcat(result, *cpp); 120859751Speter /* 120959751Speter * Attempt to open the file, and return the path if we succeed 121059751Speter * and it's a regular file. 121159751Speter */ 121259751Speter NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, p); 121362550Smckusick flags = FREAD; 121462550Smckusick error = vn_open(&nd, &flags, 0); 121559751Speter if (error == 0) { 121659751Speter NDFREE(&nd, NDF_ONLY_PNBUF); 121759751Speter type = nd.ni_vp->v_type; 121859751Speter VOP_UNLOCK(nd.ni_vp, 0, p); 121959751Speter vn_close(nd.ni_vp, FREAD, p->p_ucred, p); 122059751Speter if (type == VREG) 122159751Speter return(result); 122259751Speter } 122340159Speter } 122440159Speter free(result, M_LINKER); 122540159Speter 122640159Speter if (*ep == 0) 122740159Speter break; 122840159Speter cp = ep + 1; 122940159Speter } 123040159Speter return(NULL); 123140159Speter} 123259751Speter 123359751Speterstatic const char * 123459751Speterlinker_basename(const char* path) 123559751Speter{ 123659751Speter const char *filename; 123759751Speter 123859751Speter filename = rindex(path, '/'); 123959751Speter if (filename == NULL) 124059751Speter return path; 124159751Speter if (filename[1]) 124259751Speter filename++; 124359751Speter return filename; 124459751Speter} 124559751Speter 124659751Speter/* 124759751Speter * Find a file which contains given module and load it, 124859751Speter * if "parent" is not NULL, register a reference to it. 124959751Speter */ 125059751Speterstatic int 125159751Speterlinker_load_module(const char *modname, struct linker_file *parent) 125259751Speter{ 125359751Speter linker_file_t lfdep; 125459751Speter const char *filename; 125559751Speter char *pathname; 125659751Speter int error; 125759751Speter 125859751Speter /* 125959751Speter * There will be a system to look up or guess a file name from 126059751Speter * a module name. 126159751Speter * For now we just try to load a file with the same name. 126259751Speter */ 126359751Speter pathname = linker_search_path(modname); 126459751Speter if (pathname == NULL) 126559751Speter return ENOENT; 126659751Speter 126759751Speter /* Can't load more than one file with the same basename */ 126859751Speter filename = linker_basename(pathname); 126959751Speter if (linker_find_file_by_name(filename)) { 127059751Speter error = EEXIST; 127159751Speter goto out; 127259751Speter } 127359751Speter 127459751Speter do { 127559751Speter error = linker_load_file(pathname, &lfdep); 127659751Speter if (error) 127759751Speter break; 127859751Speter if (parent) { 127959751Speter error = linker_file_add_dependancy(parent, lfdep); 128059751Speter if (error) 128159751Speter break; 128259751Speter } 128359751Speter } while(0); 128459751Speterout: 128559751Speter if (pathname) 128659751Speter free(pathname, M_LINKER); 128759751Speter return error; 128859751Speter} 128959751Speter 129059751Speter/* 129159751Speter * This routine is responsible for finding dependencies of userland 129259751Speter * initiated kldload(2)'s of files. 129359751Speter */ 129459751Speterint 129559751Speterlinker_load_dependancies(linker_file_t lf) 129659751Speter{ 129759751Speter linker_file_t lfdep; 129859751Speter struct linker_set *deps; 129959751Speter struct mod_metadata *mp, *nmp; 130059751Speter modlist_t mod; 130159751Speter char *modname, *nmodname; 130259751Speter int i, j, error = 0; 130359751Speter 130459751Speter /* 130559751Speter * All files are dependant on /kernel. 130659751Speter */ 130759751Speter if (linker_kernel_file) { 130859751Speter linker_kernel_file->refs++; 130959751Speter error = linker_file_add_dependancy(lf, linker_kernel_file); 131059751Speter if (error) 131159751Speter return error; 131259751Speter } 131359751Speter 131459751Speter deps = (struct linker_set*) 131559751Speter linker_file_lookup_symbol(lf, MDT_SETNAME, 0); 131674641Sbp if (deps == NULL) 131774641Sbp return 0; 131874641Sbp for (i = 0; i < deps->ls_length; i++) { 131974641Sbp mp = linker_reloc_ptr(lf, deps->ls_items[i]); 132074641Sbp if (mp->md_type != MDT_VERSION) 132174641Sbp continue; 132274641Sbp modname = linker_reloc_ptr(lf, mp->md_cval); 132374641Sbp if (modlist_lookup(modname) != NULL) { 132474641Sbp printf("module %s already present!\n", modname); 132574641Sbp return EEXIST; 132659751Speter } 132759751Speter } 132874641Sbp for (i = 0; i < deps->ls_length; i++) { 132974641Sbp mp = linker_reloc_ptr(lf, deps->ls_items[i]); 133074641Sbp if (mp->md_type != MDT_DEPEND) 133174641Sbp continue; 133274641Sbp modname = linker_reloc_ptr(lf, mp->md_cval); 133374641Sbp nmodname = NULL; 133474641Sbp for (j = 0; j < deps->ls_length; j++) { 133574641Sbp nmp = linker_reloc_ptr(lf, deps->ls_items[j]); 133674641Sbp if (nmp->md_type != MDT_VERSION) 133759751Speter continue; 133874641Sbp nmodname = linker_reloc_ptr(lf, nmp->md_cval); 133974641Sbp if (strcmp(modname, nmodname) == 0) 134059751Speter break; 134159751Speter } 134274641Sbp if (j < deps->ls_length) /* early exit, it's a self reference */ 134374641Sbp continue; 134474641Sbp mod = modlist_lookup(modname); 134574641Sbp if (mod) { /* woohoo, it's loaded already */ 134674641Sbp lfdep = mod->container; 134774641Sbp lfdep->refs++; 134874641Sbp error = linker_file_add_dependancy(lf, lfdep); 134974641Sbp if (error) 135074641Sbp break; 135174641Sbp continue; 135274641Sbp } 135374641Sbp error = linker_load_module(modname, lf); 135474641Sbp if (error) { 135574641Sbp printf("KLD %s: depends on %s - not available\n", 135674641Sbp lf->filename, modname); 135774641Sbp break; 135874641Sbp } 135974641Sbp } 136059751Speter 136174641Sbp if (error) 136274641Sbp return error; 136374641Sbp for (i = 0; i < deps->ls_length; i++) { 136474641Sbp mp = linker_reloc_ptr(lf, deps->ls_items[i]); 136574641Sbp if (mp->md_type != MDT_VERSION) 136674641Sbp continue; 136774641Sbp modname = linker_reloc_ptr(lf, mp->md_cval); 136874641Sbp mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT|M_ZERO); 136974641Sbp if (mod == NULL) 137074641Sbp panic("no memory for module list"); 137174641Sbp mod->container = lf; 137274641Sbp mod->name = modname; 137374641Sbp TAILQ_INSERT_TAIL(&found_modules, mod, link); 137459751Speter } 137559751Speter return error; 137659751Speter} 1377