kern_linker.c revision 59751
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 59751 2000-04-29 13:19:31Z peter $ 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#include <vm/vm_zone.h> 4854655Seivind 4959603Sdfr#include "linker_if.h" 5059603Sdfr 5140961Speter#ifdef KLD_DEBUG 5240961Speterint kld_debug = 0; 5340961Speter#endif 5440961Speter 5559751Speterstatic char *linker_search_path(const char *name); 5659751Speterstatic const char *linker_basename(const char* path); 5759751Speter 5859751SpeterMALLOC_DEFINE(M_LINKER, "linker", "kernel linker"); 5959751Speter 6040906Speterlinker_file_t linker_kernel_file; 6131324Sbde 6225537Sdfrstatic struct lock lock; /* lock for the file list */ 6325537Sdfrstatic linker_class_list_t classes; 6450068Sgrogstatic linker_file_list_t linker_files; 6525537Sdfrstatic int next_file_id = 1; 6625537Sdfr 6759751Speter/* XXX wrong name; we're looking at version provision tags here, not modules */ 6859751Spetertypedef TAILQ_HEAD(, modlist) modlisthead_t; 6959751Speterstruct modlist { 7059751Speter TAILQ_ENTRY(modlist) link; /* chain together all modules */ 7159751Speter linker_file_t container; 7259751Speter const char *name; 7359751Speter}; 7459751Spetertypedef struct modlist *modlist_t; 7559751Speterstatic modlisthead_t found_modules; 7659751Speter 7759603Sdfrstatic char * 7859603Sdfrlinker_strdup(const char *str) 7959603Sdfr{ 8059603Sdfr char *result; 8159603Sdfr 8259603Sdfr if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL) 8359603Sdfr strcpy(result, str); 8459603Sdfr return(result); 8559603Sdfr} 8659603Sdfr 8725537Sdfrstatic void 8825537Sdfrlinker_init(void* arg) 8925537Sdfr{ 9025537Sdfr lockinit(&lock, PVM, "klink", 0, 0); 9125537Sdfr TAILQ_INIT(&classes); 9250068Sgrog TAILQ_INIT(&linker_files); 9325537Sdfr} 9425537Sdfr 9540159SpeterSYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0); 9625537Sdfr 9725537Sdfrint 9859603Sdfrlinker_add_class(linker_class_t lc) 9925537Sdfr{ 10059603Sdfr kobj_class_compile((kobj_class_t) lc); 10159751Speter TAILQ_INSERT_TAIL(&classes, lc, link); 10225537Sdfr return 0; 10325537Sdfr} 10425537Sdfr 10525537Sdfrstatic void 10625537Sdfrlinker_file_sysinit(linker_file_t lf) 10725537Sdfr{ 10825537Sdfr struct linker_set* sysinits; 10925537Sdfr struct sysinit** sipp; 11025537Sdfr struct sysinit** xipp; 11125537Sdfr struct sysinit* save; 11225537Sdfr 11325537Sdfr KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n", 11425537Sdfr lf->filename)); 11525537Sdfr 11625537Sdfr sysinits = (struct linker_set*) 11725537Sdfr linker_file_lookup_symbol(lf, "sysinit_set", 0); 11840159Speter 11940159Speter KLD_DPF(FILE, ("linker_file_sysinit: SYSINITs %p\n", sysinits)); 12025537Sdfr if (!sysinits) 12125537Sdfr return; 12225537Sdfr /* 12325537Sdfr * Perform a bubble sort of the system initialization objects by 12425537Sdfr * their subsystem (primary key) and order (secondary key). 12525537Sdfr * 12625537Sdfr * Since some things care about execution order, this is the 12725537Sdfr * operation which ensures continued function. 12825537Sdfr */ 12941055Speter for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 13041055Speter for (xipp = sipp + 1; *xipp; xipp++) { 13141055Speter if ((*sipp)->subsystem <= (*xipp)->subsystem || 13241055Speter ((*sipp)->subsystem == (*xipp)->subsystem && 13341055Speter (*sipp)->order <= (*xipp)->order)) 13425537Sdfr continue; /* skip*/ 13525537Sdfr save = *sipp; 13625537Sdfr *sipp = *xipp; 13725537Sdfr *xipp = save; 13825537Sdfr } 13925537Sdfr } 14025537Sdfr 14125537Sdfr 14225537Sdfr /* 14325537Sdfr * Traverse the (now) ordered list of system initialization tasks. 14425537Sdfr * Perform each task, and continue on to the next task. 14525537Sdfr */ 14641055Speter for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) { 14741055Speter if ((*sipp)->subsystem == SI_SUB_DUMMY) 14825537Sdfr continue; /* skip dummy task(s)*/ 14925537Sdfr 15048391Speter /* Call function */ 15148391Speter (*((*sipp)->func))((*sipp)->udata); 15225537Sdfr } 15325537Sdfr} 15425537Sdfr 15541055Speterstatic void 15641055Speterlinker_file_sysuninit(linker_file_t lf) 15741055Speter{ 15841055Speter struct linker_set* sysuninits; 15941055Speter struct sysinit** sipp; 16041055Speter struct sysinit** xipp; 16141055Speter struct sysinit* save; 16241055Speter 16341055Speter KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n", 16441055Speter lf->filename)); 16541055Speter 16641055Speter sysuninits = (struct linker_set*) 16741055Speter linker_file_lookup_symbol(lf, "sysuninit_set", 0); 16841055Speter 16941055Speter KLD_DPF(FILE, ("linker_file_sysuninit: SYSUNINITs %p\n", sysuninits)); 17041055Speter if (!sysuninits) 17141055Speter return; 17241055Speter 17341055Speter /* 17441055Speter * Perform a reverse bubble sort of the system initialization objects 17541055Speter * by their subsystem (primary key) and order (secondary key). 17641055Speter * 17741055Speter * Since some things care about execution order, this is the 17841055Speter * operation which ensures continued function. 17941055Speter */ 18041055Speter for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) { 18141055Speter for (xipp = sipp + 1; *xipp; xipp++) { 18241055Speter if ((*sipp)->subsystem >= (*xipp)->subsystem || 18341055Speter ((*sipp)->subsystem == (*xipp)->subsystem && 18441055Speter (*sipp)->order >= (*xipp)->order)) 18541055Speter continue; /* skip*/ 18641055Speter save = *sipp; 18741055Speter *sipp = *xipp; 18841055Speter *xipp = save; 18941055Speter } 19041055Speter } 19141055Speter 19241055Speter /* 19341055Speter * Traverse the (now) ordered list of system initialization tasks. 19441055Speter * Perform each task, and continue on to the next task. 19541055Speter */ 19641055Speter for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) { 19741055Speter if ((*sipp)->subsystem == SI_SUB_DUMMY) 19841055Speter continue; /* skip dummy task(s)*/ 19941055Speter 20048391Speter /* Call function */ 20148391Speter (*((*sipp)->func))((*sipp)->udata); 20241055Speter } 20341055Speter} 20441055Speter 20544078Sdfrstatic void 20644078Sdfrlinker_file_register_sysctls(linker_file_t lf) 20744078Sdfr{ 20844078Sdfr struct linker_set* sysctls; 20944078Sdfr 21044078Sdfr KLD_DPF(FILE, ("linker_file_register_sysctls: registering SYSCTLs for %s\n", 21144078Sdfr lf->filename)); 21244078Sdfr 21344078Sdfr sysctls = (struct linker_set*) 21444078Sdfr linker_file_lookup_symbol(lf, "sysctl_set", 0); 21544078Sdfr 21644078Sdfr KLD_DPF(FILE, ("linker_file_register_sysctls: SYSCTLs %p\n", sysctls)); 21744078Sdfr if (!sysctls) 21844078Sdfr return; 21944078Sdfr 22044078Sdfr sysctl_register_set(sysctls); 22144078Sdfr} 22244078Sdfr 22344078Sdfrstatic void 22444078Sdfrlinker_file_unregister_sysctls(linker_file_t lf) 22544078Sdfr{ 22644078Sdfr struct linker_set* sysctls; 22744078Sdfr 22844078Sdfr KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs for %s\n", 22944078Sdfr lf->filename)); 23044078Sdfr 23144078Sdfr sysctls = (struct linker_set*) 23244078Sdfr linker_file_lookup_symbol(lf, "sysctl_set", 0); 23344078Sdfr 23444078Sdfr KLD_DPF(FILE, ("linker_file_unregister_sysctls: SYSCTLs %p\n", sysctls)); 23544078Sdfr if (!sysctls) 23644078Sdfr return; 23744078Sdfr 23844078Sdfr sysctl_unregister_set(sysctls); 23944078Sdfr} 24044078Sdfr 24159751Speterstatic int 24259751Speterlinker_file_register_modules(linker_file_t lf) 24359751Speter{ 24459751Speter int error, mcount; 24559751Speter struct linker_set *modules; 24659751Speter struct mod_metadata **mdpp; 24759751Speter const moduledata_t *moddata; 24859751Speter struct sysinit **sipp; 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); 25559751Speter mcount = 0; 25659751Speter if (modules) { 25759751Speter for (mdpp = (struct mod_metadata**)modules->ls_items; *mdpp; mdpp++) { 25859751Speter if ((*mdpp)->md_type != MDT_MODULE) 25959751Speter continue; 26059751Speter mcount++; 26159751Speter moddata = (*mdpp)->md_data; 26259751Speter KLD_DPF(FILE, ("Registering module %s in %s\n", 26359751Speter moddata->name, lf->filename)); 26459751Speter error = module_register(moddata, lf); 26559751Speter if (error) 26659751Speter printf("Module %s failed to register: %d\n", moddata->name, error); 26759751Speter } 26859751Speter } 26959751Speter if (mcount) 27059751Speter return mcount; /* Do not mix old and new style */ 27159751Speter 27259751Speter /* Hack - handle old kld's without metadata */ 27359751Speter modules = (struct linker_set*) 27459751Speter linker_file_lookup_symbol(lf, "sysinit_set", 0); 27559751Speter if (modules) { 27659751Speter for (sipp = (struct sysinit **)modules->ls_items; *sipp; sipp++) { 27759751Speter if ((*sipp)->func != module_register_init) 27859751Speter continue; 27959751Speter mcount++; 28059751Speter moddata = (*sipp)->udata; 28159751Speter printf("Old-style KLD file %s found\n", moddata->name); 28259751Speter error = module_register(moddata, lf); 28359751Speter if (error) 28459751Speter printf("Old-style KLD file %s failed to register: %d\n", moddata->name, error); 28559751Speter } 28659751Speter } 28759751Speter return mcount; 28859751Speter} 28959751Speter 29059751Speterstatic void 29159751Speterlinker_init_kernel_modules(void) 29259751Speter{ 29359751Speter linker_file_register_modules(linker_kernel_file); 29459751Speter} 29559751Speter 29659751SpeterSYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0); 29759751Speter 29825537Sdfrint 29925537Sdfrlinker_load_file(const char* filename, linker_file_t* result) 30025537Sdfr{ 30125537Sdfr linker_class_t lc; 30225537Sdfr linker_file_t lf; 30342755Speter int foundfile, error = 0; 30425537Sdfr 30525537Sdfr lf = linker_find_file_by_name(filename); 30625537Sdfr if (lf) { 30725537Sdfr KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename)); 30825537Sdfr *result = lf; 30925537Sdfr lf->refs++; 31025537Sdfr goto out; 31125537Sdfr } 31225537Sdfr 31325537Sdfr lf = NULL; 31442755Speter foundfile = 0; 31525537Sdfr for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) { 31625537Sdfr KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n", 31725537Sdfr filename, lc->desc)); 31859751Speter error = LINKER_LOAD_FILE(lc, filename, &lf); 31942755Speter /* 32042755Speter * If we got something other than ENOENT, then it exists but we cannot 32142755Speter * load it for some other reason. 32242755Speter */ 32342755Speter if (error != ENOENT) 32442755Speter foundfile = 1; 32525537Sdfr if (lf) { 32659751Speter linker_file_register_modules(lf); 32744549Sdfr linker_file_register_sysctls(lf); 32825537Sdfr linker_file_sysinit(lf); 32959751Speter lf->flags |= LINKER_FILE_LINKED; 33025537Sdfr 33125537Sdfr *result = lf; 33240861Speter error = 0; 33325537Sdfr goto out; 33425537Sdfr } 33525537Sdfr } 33642755Speter /* 33742755Speter * Less than ideal, but tells the user whether it failed to load or 33842755Speter * the module was not found. 33942755Speter */ 34042755Speter if (foundfile) 34142755Speter error = ENOEXEC; /* Format not recognised (or unloadable) */ 34242755Speter else 34342755Speter error = ENOENT; /* Nothing found */ 34425537Sdfr 34525537Sdfrout: 34625537Sdfr return error; 34725537Sdfr} 34825537Sdfr 34925537Sdfrlinker_file_t 35025537Sdfrlinker_find_file_by_name(const char* filename) 35125537Sdfr{ 35225537Sdfr linker_file_t lf = 0; 35340861Speter char *koname; 35425537Sdfr 35540861Speter koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK); 35640861Speter if (koname == NULL) 35740861Speter goto out; 35840861Speter sprintf(koname, "%s.ko", filename); 35940861Speter 36025537Sdfr lockmgr(&lock, LK_SHARED, 0, curproc); 36150068Sgrog for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) { 36240861Speter if (!strcmp(lf->filename, koname)) 36340861Speter break; 36425537Sdfr if (!strcmp(lf->filename, filename)) 36525537Sdfr break; 36640861Speter } 36725537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 36825537Sdfr 36940861Speterout: 37040861Speter if (koname) 37140861Speter free(koname, M_LINKER); 37225537Sdfr return lf; 37325537Sdfr} 37425537Sdfr 37525537Sdfrlinker_file_t 37625537Sdfrlinker_find_file_by_id(int fileid) 37725537Sdfr{ 37825537Sdfr linker_file_t lf = 0; 37925537Sdfr 38025537Sdfr lockmgr(&lock, LK_SHARED, 0, curproc); 38150068Sgrog for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) 38225537Sdfr if (lf->id == fileid) 38325537Sdfr break; 38425537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 38525537Sdfr 38625537Sdfr return lf; 38725537Sdfr} 38825537Sdfr 38925537Sdfrlinker_file_t 39059603Sdfrlinker_make_file(const char* pathname, linker_class_t lc) 39125537Sdfr{ 39225537Sdfr linker_file_t lf = 0; 39340159Speter const char *filename; 39425537Sdfr 39559751Speter filename = linker_basename(pathname); 39640159Speter 39725537Sdfr KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename)); 39845356Speter lockmgr(&lock, LK_EXCLUSIVE, 0, curproc); 39959603Sdfr lf = (linker_file_t) kobj_create((kobj_class_t) lc, M_LINKER, M_WAITOK); 40025537Sdfr if (!lf) 40125537Sdfr goto out; 40225537Sdfr 40325537Sdfr lf->refs = 1; 40425537Sdfr lf->userrefs = 0; 40543185Sdfr lf->flags = 0; 40659603Sdfr lf->filename = linker_strdup(filename); 40725537Sdfr lf->id = next_file_id++; 40825537Sdfr lf->ndeps = 0; 40925537Sdfr lf->deps = NULL; 41025537Sdfr STAILQ_INIT(&lf->common); 41125537Sdfr TAILQ_INIT(&lf->modules); 41225537Sdfr 41350068Sgrog TAILQ_INSERT_TAIL(&linker_files, lf, link); 41425537Sdfr 41525537Sdfrout: 41625537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 41725537Sdfr return lf; 41825537Sdfr} 41925537Sdfr 42025537Sdfrint 42125537Sdfrlinker_file_unload(linker_file_t file) 42225537Sdfr{ 42325537Sdfr module_t mod, next; 42459751Speter modlist_t ml, nextml; 42525537Sdfr struct common_symbol* cp; 42625537Sdfr int error = 0; 42725537Sdfr int i; 42825537Sdfr 42940159Speter KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs)); 43045356Speter lockmgr(&lock, LK_EXCLUSIVE, 0, curproc); 43125537Sdfr if (file->refs == 1) { 43225537Sdfr KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n")); 43325537Sdfr /* 43425537Sdfr * Inform any modules associated with this file. 43525537Sdfr */ 43625537Sdfr for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) { 43725537Sdfr next = module_getfnext(mod); 43825537Sdfr 43925537Sdfr /* 44025537Sdfr * Give the module a chance to veto the unload. 44125537Sdfr */ 44243301Sdillon if ((error = module_unload(mod)) != 0) { 44325537Sdfr KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n", 44425537Sdfr mod)); 44525537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 44625537Sdfr goto out; 44725537Sdfr } 44825537Sdfr 44925537Sdfr module_release(mod); 45025537Sdfr } 45125537Sdfr } 45225537Sdfr 45325537Sdfr file->refs--; 45425537Sdfr if (file->refs > 0) { 45525537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 45625537Sdfr goto out; 45725537Sdfr } 45825537Sdfr 45959751Speter for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) { 46059751Speter nextml = TAILQ_NEXT(ml, link); 46159751Speter if (ml->container == file) { 46259751Speter TAILQ_REMOVE(&found_modules, ml, link); 46359751Speter } 46459751Speter } 46559751Speter 46643185Sdfr /* Don't try to run SYSUNINITs if we are unloaded due to a link error */ 46744078Sdfr if (file->flags & LINKER_FILE_LINKED) { 46843185Sdfr linker_file_sysuninit(file); 46944078Sdfr linker_file_unregister_sysctls(file); 47044078Sdfr } 47141055Speter 47250068Sgrog TAILQ_REMOVE(&linker_files, file, link); 47325537Sdfr lockmgr(&lock, LK_RELEASE, 0, curproc); 47440159Speter 47559751Speter if (file->deps) { 47659751Speter for (i = 0; i < file->ndeps; i++) 47759751Speter linker_file_unload(file->deps[i]); 47859751Speter free(file->deps, M_LINKER); 47959751Speter file->deps = NULL; 48059751Speter } 48125537Sdfr 48225537Sdfr for (cp = STAILQ_FIRST(&file->common); cp; 48325537Sdfr cp = STAILQ_FIRST(&file->common)) { 48425537Sdfr STAILQ_REMOVE(&file->common, cp, common_symbol, link); 48525537Sdfr free(cp, M_LINKER); 48625537Sdfr } 48725537Sdfr 48859603Sdfr LINKER_UNLOAD(file); 48959751Speter if (file->filename) { 49059751Speter free(file->filename, M_LINKER); 49159751Speter file->filename = NULL; 49259751Speter } 49359603Sdfr kobj_delete((kobj_t) file, M_LINKER); 49425537Sdfr 49525537Sdfrout: 49625537Sdfr return error; 49725537Sdfr} 49825537Sdfr 49925537Sdfrint 50025537Sdfrlinker_file_add_dependancy(linker_file_t file, linker_file_t dep) 50125537Sdfr{ 50225537Sdfr linker_file_t* newdeps; 50325537Sdfr 50425537Sdfr newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*), 50525537Sdfr M_LINKER, M_WAITOK); 50625537Sdfr if (newdeps == NULL) 50725537Sdfr return ENOMEM; 50840395Speter bzero(newdeps, (file->ndeps + 1) * sizeof(linker_file_t*)); 50925537Sdfr 51025537Sdfr if (file->deps) { 51125537Sdfr bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*)); 51225537Sdfr free(file->deps, M_LINKER); 51325537Sdfr } 51425537Sdfr file->deps = newdeps; 51525537Sdfr file->deps[file->ndeps] = dep; 51625537Sdfr file->ndeps++; 51725537Sdfr 51825537Sdfr return 0; 51925537Sdfr} 52025537Sdfr 52125537Sdfrcaddr_t 52225537Sdfrlinker_file_lookup_symbol(linker_file_t file, const char* name, int deps) 52325537Sdfr{ 52443309Sdillon c_linker_sym_t sym; 52538275Sdfr linker_symval_t symval; 52625537Sdfr caddr_t address; 52725537Sdfr size_t common_size = 0; 52825537Sdfr int i; 52925537Sdfr 53040159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n", 53125537Sdfr file, name, deps)); 53225537Sdfr 53359603Sdfr if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) { 53459603Sdfr LINKER_SYMBOL_VALUES(file, sym, &symval); 53538275Sdfr if (symval.value == 0) 53625537Sdfr /* 53725537Sdfr * For commons, first look them up in the dependancies and 53825537Sdfr * only allocate space if not found there. 53925537Sdfr */ 54038275Sdfr common_size = symval.size; 54140159Speter else { 54240159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value)); 54338275Sdfr return symval.value; 54440159Speter } 54538275Sdfr } 54625537Sdfr 54742849Speter if (deps) { 54825537Sdfr for (i = 0; i < file->ndeps; i++) { 54925537Sdfr address = linker_file_lookup_symbol(file->deps[i], name, 0); 55040159Speter if (address) { 55140159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", address)); 55225537Sdfr return address; 55340159Speter } 55425537Sdfr } 55542849Speter } 55642849Speter 55725537Sdfr if (common_size > 0) { 55825537Sdfr /* 55925537Sdfr * This is a common symbol which was not found in the 56025537Sdfr * dependancies. We maintain a simple common symbol table in 56125537Sdfr * the file object. 56225537Sdfr */ 56325537Sdfr struct common_symbol* cp; 56425537Sdfr 56525537Sdfr for (cp = STAILQ_FIRST(&file->common); cp; 56625537Sdfr cp = STAILQ_NEXT(cp, link)) 56740159Speter if (!strcmp(cp->name, name)) { 56840159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address)); 56925537Sdfr return cp->address; 57040159Speter } 57125537Sdfr 57225537Sdfr /* 57325537Sdfr * Round the symbol size up to align. 57425537Sdfr */ 57525537Sdfr common_size = (common_size + sizeof(int) - 1) & -sizeof(int); 57625537Sdfr cp = malloc(sizeof(struct common_symbol) 57725537Sdfr + common_size 57825537Sdfr + strlen(name) + 1, 57925537Sdfr M_LINKER, M_WAITOK); 58040159Speter if (!cp) { 58140159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n")); 58225537Sdfr return 0; 58340159Speter } 58440395Speter bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1); 58525537Sdfr 58625537Sdfr cp->address = (caddr_t) (cp + 1); 58725537Sdfr cp->name = cp->address + common_size; 58825537Sdfr strcpy(cp->name, name); 58925537Sdfr bzero(cp->address, common_size); 59025537Sdfr STAILQ_INSERT_TAIL(&file->common, cp, link); 59125537Sdfr 59240159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address)); 59325537Sdfr return cp->address; 59425537Sdfr } 59525537Sdfr 59640159Speter KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n")); 59725537Sdfr return 0; 59825537Sdfr} 59925537Sdfr 60040159Speter#ifdef DDB 60125537Sdfr/* 60240159Speter * DDB Helpers. DDB has to look across multiple files with their own 60340159Speter * symbol tables and string tables. 60440159Speter * 60540159Speter * Note that we do not obey list locking protocols here. We really don't 60640159Speter * need DDB to hang because somebody's got the lock held. We'll take the 60740159Speter * chance that the files list is inconsistant instead. 60840159Speter */ 60940159Speter 61040159Speterint 61143309Sdillonlinker_ddb_lookup(const char *symstr, c_linker_sym_t *sym) 61240159Speter{ 61340159Speter linker_file_t lf; 61440159Speter 61550068Sgrog for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) { 61659603Sdfr if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0) 61740159Speter return 0; 61840159Speter } 61940159Speter return ENOENT; 62040159Speter} 62140159Speter 62240159Speterint 62343309Sdillonlinker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp) 62440159Speter{ 62540159Speter linker_file_t lf; 62650272Sbde u_long off = (uintptr_t)value; 62740159Speter u_long diff, bestdiff; 62843309Sdillon c_linker_sym_t best; 62943309Sdillon c_linker_sym_t es; 63040159Speter 63140159Speter best = 0; 63240159Speter bestdiff = off; 63350068Sgrog for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) { 63459603Sdfr if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0) 63540159Speter continue; 63640159Speter if (es != 0 && diff < bestdiff) { 63740159Speter best = es; 63840159Speter bestdiff = diff; 63940159Speter } 64040159Speter if (bestdiff == 0) 64140159Speter break; 64240159Speter } 64340159Speter if (best) { 64440159Speter *sym = best; 64540159Speter *diffp = bestdiff; 64640159Speter return 0; 64740159Speter } else { 64840159Speter *sym = 0; 64940159Speter *diffp = off; 65040159Speter return ENOENT; 65140159Speter } 65240159Speter} 65340159Speter 65440159Speterint 65543309Sdillonlinker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval) 65640159Speter{ 65740159Speter linker_file_t lf; 65840159Speter 65950068Sgrog for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) { 66059603Sdfr if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0) 66140159Speter return 0; 66240159Speter } 66340159Speter return ENOENT; 66440159Speter} 66540159Speter 66640159Speter#endif 66740159Speter 66840159Speter/* 66925537Sdfr * Syscalls. 67025537Sdfr */ 67125537Sdfr 67225537Sdfrint 67330994Sphkkldload(struct proc* p, struct kldload_args* uap) 67425537Sdfr{ 67559751Speter char* pathname, *realpath; 67659751Speter const char *filename; 67725537Sdfr linker_file_t lf; 67825537Sdfr int error = 0; 67925537Sdfr 68030994Sphk p->p_retval[0] = -1; 68125537Sdfr 68225537Sdfr if (securelevel > 0) 68325537Sdfr return EPERM; 68425537Sdfr 68546112Sphk if ((error = suser(p)) != 0) 68625537Sdfr return error; 68725537Sdfr 68859751Speter realpath = NULL; 68959751Speter pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 69059751Speter if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, NULL)) != 0) 69125537Sdfr goto out; 69225537Sdfr 69359751Speter realpath = linker_search_path(pathname); 69459751Speter if (realpath == NULL) { 69559751Speter error = ENOENT; 69659751Speter goto out; 69759751Speter } 69859751Speter /* Can't load more than one file with the same name */ 69959751Speter filename = linker_basename(realpath); 70059751Speter if (linker_find_file_by_name(filename)) { 70142316Smsmith error = EEXIST; 70242316Smsmith goto out; 70342316Smsmith } 70442316Smsmith 70559751Speter if ((error = linker_load_file(realpath, &lf)) != 0) 70625537Sdfr goto out; 70725537Sdfr 70825537Sdfr lf->userrefs++; 70930994Sphk p->p_retval[0] = lf->id; 71040159Speter 71125537Sdfrout: 71259751Speter if (pathname) 71359751Speter free(pathname, M_TEMP); 71459751Speter if (realpath) 71559751Speter free(realpath, M_LINKER); 71625537Sdfr return error; 71725537Sdfr} 71825537Sdfr 71925537Sdfrint 72030994Sphkkldunload(struct proc* p, struct kldunload_args* uap) 72125537Sdfr{ 72225537Sdfr linker_file_t lf; 72325537Sdfr int error = 0; 72425537Sdfr 72525537Sdfr if (securelevel > 0) 72625537Sdfr return EPERM; 72725537Sdfr 72846112Sphk if ((error = suser(p)) != 0) 72925537Sdfr return error; 73025537Sdfr 73125537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 73225537Sdfr if (lf) { 73325537Sdfr KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs)); 73425537Sdfr if (lf->userrefs == 0) { 73559751Speter printf("kldunload: attempt to unload file that was loaded by the kernel\n"); 73625537Sdfr error = EBUSY; 73725537Sdfr goto out; 73825537Sdfr } 73943084Speter lf->userrefs--; 74042837Speter error = linker_file_unload(lf); 74142837Speter if (error) 74243084Speter lf->userrefs++; 74325537Sdfr } else 74425537Sdfr error = ENOENT; 74525537Sdfr 74625537Sdfrout: 74725537Sdfr return error; 74825537Sdfr} 74925537Sdfr 75025537Sdfrint 75130994Sphkkldfind(struct proc* p, struct kldfind_args* uap) 75225537Sdfr{ 75359751Speter char* pathname; 75459751Speter const char *filename; 75525537Sdfr linker_file_t lf; 75625537Sdfr int error = 0; 75725537Sdfr 75830994Sphk p->p_retval[0] = -1; 75925537Sdfr 76059751Speter pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 76159751Speter if ((error = copyinstr(SCARG(uap, file), pathname, MAXPATHLEN, NULL)) != 0) 76225537Sdfr goto out; 76325537Sdfr 76459751Speter filename = linker_basename(pathname); 76542316Smsmith 76659751Speter lf = linker_find_file_by_name(filename); 76725537Sdfr if (lf) 76830994Sphk p->p_retval[0] = lf->id; 76925537Sdfr else 77025537Sdfr error = ENOENT; 77140159Speter 77225537Sdfrout: 77359751Speter if (pathname) 77459751Speter free(pathname, M_TEMP); 77525537Sdfr return error; 77625537Sdfr} 77725537Sdfr 77825537Sdfrint 77930994Sphkkldnext(struct proc* p, struct kldnext_args* uap) 78025537Sdfr{ 78125537Sdfr linker_file_t lf; 78225537Sdfr int error = 0; 78325537Sdfr 78425537Sdfr if (SCARG(uap, fileid) == 0) { 78550068Sgrog if (TAILQ_FIRST(&linker_files)) 78650068Sgrog p->p_retval[0] = TAILQ_FIRST(&linker_files)->id; 78725537Sdfr else 78830994Sphk p->p_retval[0] = 0; 78925537Sdfr return 0; 79025537Sdfr } 79140159Speter 79225537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 79325537Sdfr if (lf) { 79425537Sdfr if (TAILQ_NEXT(lf, link)) 79530994Sphk p->p_retval[0] = TAILQ_NEXT(lf, link)->id; 79625537Sdfr else 79730994Sphk p->p_retval[0] = 0; 79825537Sdfr } else 79925537Sdfr error = ENOENT; 80025537Sdfr 80125537Sdfr return error; 80225537Sdfr} 80325537Sdfr 80425537Sdfrint 80530994Sphkkldstat(struct proc* p, struct kldstat_args* uap) 80625537Sdfr{ 80725537Sdfr linker_file_t lf; 80825537Sdfr int error = 0; 80925537Sdfr int version; 81025537Sdfr struct kld_file_stat* stat; 81125537Sdfr int namelen; 81225537Sdfr 81325537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 81425537Sdfr if (!lf) { 81525537Sdfr error = ENOENT; 81625537Sdfr goto out; 81725537Sdfr } 81825537Sdfr 81925537Sdfr stat = SCARG(uap, stat); 82025537Sdfr 82125537Sdfr /* 82225537Sdfr * Check the version of the user's structure. 82325537Sdfr */ 82443301Sdillon if ((error = copyin(&stat->version, &version, sizeof(version))) != 0) 82525537Sdfr goto out; 82625537Sdfr if (version != sizeof(struct kld_file_stat)) { 82725537Sdfr error = EINVAL; 82825537Sdfr goto out; 82925537Sdfr } 83025537Sdfr 83125537Sdfr namelen = strlen(lf->filename) + 1; 83225537Sdfr if (namelen > MAXPATHLEN) 83325537Sdfr namelen = MAXPATHLEN; 83443301Sdillon if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0) 83525537Sdfr goto out; 83643301Sdillon if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0) 83725537Sdfr goto out; 83843301Sdillon if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0) 83925537Sdfr goto out; 84043301Sdillon if ((error = copyout(&lf->address, &stat->address, sizeof(caddr_t))) != 0) 84125537Sdfr goto out; 84243301Sdillon if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0) 84325537Sdfr goto out; 84425537Sdfr 84530994Sphk p->p_retval[0] = 0; 84625537Sdfr 84725537Sdfrout: 84825537Sdfr return error; 84925537Sdfr} 85025537Sdfr 85125537Sdfrint 85230994Sphkkldfirstmod(struct proc* p, struct kldfirstmod_args* uap) 85325537Sdfr{ 85425537Sdfr linker_file_t lf; 85525537Sdfr int error = 0; 85625537Sdfr 85725537Sdfr lf = linker_find_file_by_id(SCARG(uap, fileid)); 85825537Sdfr if (lf) { 85925537Sdfr if (TAILQ_FIRST(&lf->modules)) 86030994Sphk p->p_retval[0] = module_getid(TAILQ_FIRST(&lf->modules)); 86125537Sdfr else 86230994Sphk p->p_retval[0] = 0; 86325537Sdfr } else 86425537Sdfr error = ENOENT; 86525537Sdfr 86625537Sdfr return error; 86725537Sdfr} 86840159Speter 86941090Speterint 87041090Speterkldsym(struct proc *p, struct kldsym_args *uap) 87141090Speter{ 87241090Speter char *symstr = NULL; 87343309Sdillon c_linker_sym_t sym; 87441090Speter linker_symval_t symval; 87541090Speter linker_file_t lf; 87641090Speter struct kld_sym_lookup lookup; 87741090Speter int error = 0; 87841090Speter 87943301Sdillon if ((error = copyin(SCARG(uap, data), &lookup, sizeof(lookup))) != 0) 88041090Speter goto out; 88141090Speter if (lookup.version != sizeof(lookup) || SCARG(uap, cmd) != KLDSYM_LOOKUP) { 88241090Speter error = EINVAL; 88341090Speter goto out; 88441090Speter } 88541090Speter 88641090Speter symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 88743301Sdillon if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0) 88841090Speter goto out; 88941090Speter 89041090Speter if (SCARG(uap, fileid) != 0) { 89141090Speter lf = linker_find_file_by_id(SCARG(uap, fileid)); 89241090Speter if (lf == NULL) { 89341090Speter error = ENOENT; 89441090Speter goto out; 89541090Speter } 89659603Sdfr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 89759603Sdfr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 89850272Sbde lookup.symvalue = (uintptr_t)symval.value; 89941090Speter lookup.symsize = symval.size; 90041090Speter error = copyout(&lookup, SCARG(uap, data), sizeof(lookup)); 90141090Speter } else 90241090Speter error = ENOENT; 90341090Speter } else { 90450068Sgrog for (lf = TAILQ_FIRST(&linker_files); lf; lf = TAILQ_NEXT(lf, link)) { 90559603Sdfr if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 && 90659603Sdfr LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) { 90750272Sbde lookup.symvalue = (uintptr_t)symval.value; 90841090Speter lookup.symsize = symval.size; 90941090Speter error = copyout(&lookup, SCARG(uap, data), sizeof(lookup)); 91041090Speter break; 91141090Speter } 91241090Speter } 91341090Speter if (!lf) 91441090Speter error = ENOENT; 91541090Speter } 91641090Speterout: 91741090Speter if (symstr) 91841090Speter free(symstr, M_TEMP); 91941090Speter return error; 92041090Speter} 92141090Speter 92240159Speter/* 92340159Speter * Preloaded module support 92440159Speter */ 92540159Speter 92659751Speterstatic modlist_t 92759751Spetermodlist_lookup(const char *name) 92859751Speter{ 92959751Speter modlist_t mod; 93059751Speter 93159751Speter for (mod = TAILQ_FIRST(&found_modules); mod; mod = TAILQ_NEXT(mod, link)) { 93259751Speter if (!strcmp(mod->name, name)) 93359751Speter return mod; 93459751Speter } 93559751Speter return NULL; 93659751Speter} 93759751Speter 93859751Speter/* 93959751Speter * This routine is cheap and nasty but will work for data pointers. 94059751Speter */ 94159751Speterstatic void * 94259751Speterlinker_reloc_ptr(linker_file_t lf, void *offset) 94359751Speter{ 94459751Speter return lf->address + (uintptr_t)offset; 94559751Speter} 94659751Speter 94740159Speterstatic void 94840159Speterlinker_preload(void* arg) 94940159Speter{ 95040159Speter caddr_t modptr; 95140159Speter char *modname; 95240162Speter char *modtype; 95340159Speter linker_file_t lf; 95440159Speter linker_class_t lc; 95559751Speter int error, mcount; 95640159Speter struct linker_set *sysinits; 95759751Speter linker_file_list_t loaded_files; 95859751Speter linker_file_list_t depended_files; 95959751Speter struct linker_set *deps; 96059751Speter struct mod_metadata *mp; 96159751Speter int i; 96259751Speter int resolves; 96359751Speter modlist_t mod; 96440159Speter 96559751Speter TAILQ_INIT(&loaded_files); 96659751Speter TAILQ_INIT(&depended_files); 96759751Speter TAILQ_INIT(&found_modules); 96859751Speter error = 0; 96959751Speter 97040159Speter modptr = NULL; 97140159Speter while ((modptr = preload_search_next_name(modptr)) != NULL) { 97240159Speter modname = (char *)preload_search_info(modptr, MODINFO_NAME); 97340162Speter modtype = (char *)preload_search_info(modptr, MODINFO_TYPE); 97440159Speter if (modname == NULL) { 97540625Smsmith printf("Preloaded module at %p does not have a name!\n", modptr); 97640159Speter continue; 97740159Speter } 97840162Speter if (modtype == NULL) { 97940625Smsmith printf("Preloaded module at %p does not have a type!\n", modptr); 98040162Speter continue; 98140162Speter } 98240625Smsmith printf("Preloaded %s \"%s\" at %p.\n", modtype, modname, modptr); 98340159Speter lf = NULL; 98440159Speter for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) { 98559751Speter error = LINKER_LINK_PRELOAD(lc, modname, &lf); 98640159Speter if (error) { 98740159Speter lf = NULL; 98840159Speter break; 98940159Speter } 99040159Speter } 99159751Speter if (lf) 99259751Speter TAILQ_INSERT_TAIL(&loaded_files, lf, loaded); 99359751Speter } 99440159Speter 99559751Speter /* 99659751Speter * First get a list of stuff in the kernel. 99759751Speter */ 99859751Speter deps = (struct linker_set*) 99959751Speter linker_file_lookup_symbol(linker_kernel_file, MDT_SETNAME, 0); 100059751Speter if (deps) { 100159751Speter for (i = 0; i < deps->ls_length; i++) { 100259751Speter mp = deps->ls_items[i]; 100359751Speter if (mp->md_type != MDT_VERSION) 100459751Speter continue; 100559751Speter modname = mp->md_cval; 100659751Speter if (modlist_lookup(modname) != NULL) { 100759751Speter printf("module %s already present!\n", modname); 100859751Speter /* XXX what can we do? this is a build error. :-( */ 100959751Speter continue; 101059751Speter } 101159751Speter mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT); 101259751Speter if (mod == NULL) 101359751Speter panic("no memory for module list"); 101459751Speter bzero(mod, sizeof(*mod)); 101559751Speter mod->container = linker_kernel_file; 101659751Speter mod->name = modname; 101759751Speter TAILQ_INSERT_TAIL(&found_modules, mod, link); 101859751Speter } 101959751Speter } 102059751Speter 102159751Speter /* 102259751Speter * this is a once-off kinky bubble sort 102359751Speter * resolve relocation dependency requirements 102459751Speter */ 102559751Speterrestart: 102659751Speter for (lf = TAILQ_FIRST(&loaded_files); lf; lf = TAILQ_NEXT(lf, loaded)) { 102759751Speter deps = (struct linker_set*) 102859751Speter linker_file_lookup_symbol(lf, MDT_SETNAME, 0); 102959751Speter /* 103059751Speter * First, look to see if we would successfully link with this stuff. 103159751Speter */ 103259751Speter resolves = 1; /* unless we know otherwise */ 103359751Speter if (deps) { 103459751Speter for (i = 0; i < deps->ls_length; i++) { 103559751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 103659751Speter if (mp->md_type != MDT_DEPEND) 103759751Speter continue; 103859751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 103959751Speter if (modlist_lookup(modname) == NULL) { 104059751Speter /* ok, the module isn't here yet, we are not finished */ 104159751Speter resolves = 0; 104259751Speter } 104359751Speter } 104459751Speter } 104559751Speter /* 104659751Speter * OK, if we found our modules, we can link. So, "provide" the 104759751Speter * modules inside and add it to the end of the link order list. 104859751Speter */ 104959751Speter if (resolves) { 105059751Speter if (deps) { 105159751Speter for (i = 0; i < deps->ls_length; i++) { 105259751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 105359751Speter if (mp->md_type != MDT_VERSION) 105459751Speter continue; 105559751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 105659751Speter if (modlist_lookup(modname) != NULL) { 105759751Speter printf("module %s already present!\n", modname); 105859751Speter linker_file_unload(lf); 105959751Speter TAILQ_REMOVE(&loaded_files, lf, loaded); 106059751Speter goto restart; /* we changed the tailq next ptr */ 106140159Speter } 106259751Speter mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT); 106359751Speter if (mod == NULL) 106459751Speter panic("no memory for module list"); 106559751Speter bzero(mod, sizeof(*mod)); 106659751Speter mod->container = lf; 106759751Speter mod->name = modname; 106859751Speter TAILQ_INSERT_TAIL(&found_modules, mod, link); 106940159Speter } 107040159Speter } 107159751Speter TAILQ_REMOVE(&loaded_files, lf, loaded); 107259751Speter TAILQ_INSERT_TAIL(&depended_files, lf, loaded); 107359751Speter /* 107459751Speter * Since we provided modules, we need to restart the sort so 107559751Speter * that the previous files that depend on us have a chance. 107659751Speter * Also, we've busted the tailq next pointer with the REMOVE. 107759751Speter */ 107859751Speter goto restart; 107940159Speter } 108040159Speter } 108159751Speter 108259751Speter /* 108359751Speter * At this point, we check to see what could not be resolved.. 108459751Speter */ 108559751Speter for (lf = TAILQ_FIRST(&loaded_files); lf; lf = TAILQ_NEXT(lf, loaded)) { 108659751Speter printf("KLD file %s is missing dependencies\n", lf->filename); 108759751Speter linker_file_unload(lf); 108859751Speter TAILQ_REMOVE(&loaded_files, lf, loaded); 108959751Speter } 109059751Speter 109159751Speter /* 109259751Speter * We made it. Finish off the linking in the order we determined. 109359751Speter */ 109459751Speter for (lf = TAILQ_FIRST(&depended_files); lf; lf = TAILQ_NEXT(lf, loaded)) { 109559751Speter if (linker_kernel_file) { 109659751Speter linker_kernel_file->refs++; 109759751Speter error = linker_file_add_dependancy(lf, linker_kernel_file); 109859751Speter if (error) 109959751Speter panic("cannot add dependency"); 110059751Speter } 110159751Speter lf->userrefs++; /* so we can (try to) kldunload it */ 110259751Speter deps = (struct linker_set*) 110359751Speter linker_file_lookup_symbol(lf, MDT_SETNAME, 0); 110459751Speter if (deps) { 110559751Speter for (i = 0; i < deps->ls_length; i++) { 110659751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 110759751Speter if (mp->md_type != MDT_DEPEND) 110859751Speter continue; 110959751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 111059751Speter mod = modlist_lookup(modname); 111159751Speter mod->container->refs++; 111259751Speter error = linker_file_add_dependancy(lf, mod->container); 111359751Speter if (error) 111459751Speter panic("cannot add dependency"); 111559751Speter } 111659751Speter } 111759751Speter 111859751Speter /* Now do relocation etc using the symbol search paths established by the dependencies */ 111959751Speter error = LINKER_LINK_PRELOAD_FINISH(lf); 112059751Speter if (error) { 112159751Speter printf("KLD file %s - could not finalize loading\n", lf->filename); 112259751Speter linker_file_unload(lf); 112359751Speter continue; 112459751Speter } 112559751Speter 112659751Speter mcount = linker_file_register_modules(lf); 112759751Speter sysinits = (struct linker_set*) 112859751Speter linker_file_lookup_symbol(lf, "sysinit_set", 0); 112959751Speter if (sysinits) 113059751Speter sysinit_add((struct sysinit **)sysinits->ls_items); 113159751Speter linker_file_register_sysctls(lf); 113259751Speter lf->flags |= LINKER_FILE_LINKED; 113359751Speter } 113459751Speter /* woohoo! we made it! */ 113540159Speter} 113640159Speter 113740159SpeterSYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0); 113840159Speter 113940159Speter/* 114040159Speter * Search for a not-loaded module by name. 114140159Speter * 114240159Speter * Modules may be found in the following locations: 114340159Speter * 114440159Speter * - preloaded (result is just the module name) 114540159Speter * - on disk (result is full path to module) 114640159Speter * 114740159Speter * If the module name is qualified in any way (contains path, etc.) 114840159Speter * the we simply return a copy of it. 114940159Speter * 115040159Speter * The search path can be manipulated via sysctl. Note that we use the ';' 115140159Speter * character as a separator to be consistent with the bootloader. 115240159Speter */ 115340159Speter 115450272Sbdestatic char linker_path[MAXPATHLEN] = "/;/boot/;/modules/"; 115540159Speter 115640159SpeterSYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path, 115740159Speter sizeof(linker_path), "module load search path"); 115840159Speter 115959751Speterstatic char *linker_ext_list[] = { 116059751Speter ".ko", 116159751Speter "", 116259751Speter NULL 116359751Speter}; 116459751Speter 116559751Speterstatic char * 116640159Speterlinker_search_path(const char *name) 116740159Speter{ 116840159Speter struct nameidata nd; 116940159Speter struct proc *p = curproc; /* XXX */ 117059751Speter char *cp, *ep, *result, **cpp; 117159751Speter int error, extlen, len; 117240159Speter enum vtype type; 117340159Speter 117440159Speter /* qualified at all? */ 117554411Speter if (index(name, '/')) 117640159Speter return(linker_strdup(name)); 117740159Speter 117859751Speter extlen = 0; 117959751Speter for (cpp = linker_ext_list; *cpp; cpp++) { 118059751Speter len = strlen(*cpp); 118159751Speter if (len > extlen) 118259751Speter extlen = len; 118359751Speter } 118459751Speter extlen++; /* trailing '\0' */ 118559751Speter 118640159Speter /* traverse the linker path */ 118740159Speter cp = linker_path; 118859751Speter len = strlen(name); 118940159Speter for (;;) { 119040159Speter 119140159Speter /* find the end of this component */ 119240159Speter for (ep = cp; (*ep != 0) && (*ep != ';'); ep++) 119340159Speter ; 119459751Speter result = malloc((len + (ep - cp) + extlen), M_LINKER, M_WAITOK); 119540159Speter if (result == NULL) /* actually ENOMEM */ 119640159Speter return(NULL); 119759751Speter for (cpp = linker_ext_list; *cpp; cpp++) { 119859751Speter strncpy(result, cp, ep - cp); 119959751Speter strcpy(result + (ep - cp), name); 120059751Speter strcat(result, *cpp); 120140159Speter 120259751Speter /* 120359751Speter * Attempt to open the file, and return the path if we succeed 120459751Speter * and it's a regular file. 120559751Speter */ 120659751Speter NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, p); 120759751Speter error = vn_open(&nd, FREAD, 0); 120859751Speter if (error == 0) { 120959751Speter NDFREE(&nd, NDF_ONLY_PNBUF); 121059751Speter type = nd.ni_vp->v_type; 121159751Speter VOP_UNLOCK(nd.ni_vp, 0, p); 121259751Speter vn_close(nd.ni_vp, FREAD, p->p_ucred, p); 121359751Speter if (type == VREG) 121459751Speter return(result); 121559751Speter } 121640159Speter } 121740159Speter free(result, M_LINKER); 121840159Speter 121940159Speter if (*ep == 0) 122040159Speter break; 122140159Speter cp = ep + 1; 122240159Speter } 122340159Speter return(NULL); 122440159Speter} 122559751Speter 122659751Speterstatic const char * 122759751Speterlinker_basename(const char* path) 122859751Speter{ 122959751Speter const char *filename; 123059751Speter 123159751Speter filename = rindex(path, '/'); 123259751Speter if (filename == NULL) 123359751Speter return path; 123459751Speter if (filename[1]) 123559751Speter filename++; 123659751Speter return filename; 123759751Speter} 123859751Speter 123959751Speter/* 124059751Speter * Find a file which contains given module and load it, 124159751Speter * if "parent" is not NULL, register a reference to it. 124259751Speter */ 124359751Speterstatic int 124459751Speterlinker_load_module(const char *modname, struct linker_file *parent) 124559751Speter{ 124659751Speter linker_file_t lfdep; 124759751Speter const char *filename; 124859751Speter char *pathname; 124959751Speter int error; 125059751Speter 125159751Speter /* 125259751Speter * There will be a system to look up or guess a file name from 125359751Speter * a module name. 125459751Speter * For now we just try to load a file with the same name. 125559751Speter */ 125659751Speter pathname = linker_search_path(modname); 125759751Speter if (pathname == NULL) 125859751Speter return ENOENT; 125959751Speter 126059751Speter /* Can't load more than one file with the same basename */ 126159751Speter filename = linker_basename(pathname); 126259751Speter if (linker_find_file_by_name(filename)) { 126359751Speter error = EEXIST; 126459751Speter goto out; 126559751Speter } 126659751Speter 126759751Speter do { 126859751Speter error = linker_load_file(pathname, &lfdep); 126959751Speter if (error) 127059751Speter break; 127159751Speter if (parent) { 127259751Speter error = linker_file_add_dependancy(parent, lfdep); 127359751Speter if (error) 127459751Speter break; 127559751Speter } 127659751Speter } while(0); 127759751Speterout: 127859751Speter if (pathname) 127959751Speter free(pathname, M_LINKER); 128059751Speter return error; 128159751Speter} 128259751Speter 128359751Speter/* 128459751Speter * This routine is responsible for finding dependencies of userland 128559751Speter * initiated kldload(2)'s of files. 128659751Speter */ 128759751Speterint 128859751Speterlinker_load_dependancies(linker_file_t lf) 128959751Speter{ 129059751Speter linker_file_t lfdep; 129159751Speter struct linker_set *deps; 129259751Speter struct mod_metadata *mp, *nmp; 129359751Speter modlist_t mod; 129459751Speter char *modname, *nmodname; 129559751Speter int i, j, error = 0; 129659751Speter 129759751Speter /* 129859751Speter * All files are dependant on /kernel. 129959751Speter */ 130059751Speter if (linker_kernel_file) { 130159751Speter linker_kernel_file->refs++; 130259751Speter error = linker_file_add_dependancy(lf, linker_kernel_file); 130359751Speter if (error) 130459751Speter return error; 130559751Speter } 130659751Speter 130759751Speter deps = (struct linker_set*) 130859751Speter linker_file_lookup_symbol(lf, MDT_SETNAME, 0); 130959751Speter if (deps != NULL) { 131059751Speter for (i = 0; i < deps->ls_length; i++) { 131159751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 131259751Speter if (mp->md_type != MDT_VERSION) 131359751Speter continue; 131459751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 131559751Speter if (modlist_lookup(modname) != NULL) { 131659751Speter printf("module %s already present!\n", modname); 131759751Speter return EEXIST; 131859751Speter } 131959751Speter } 132059751Speter } 132159751Speter if (deps != NULL) { 132259751Speter for (i = 0; i < deps->ls_length; i++) { 132359751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 132459751Speter if (mp->md_type != MDT_DEPEND) 132559751Speter continue; 132659751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 132759751Speter nmodname = NULL; 132859751Speter for (j = 0; j < deps->ls_length; j++) { 132959751Speter nmp = linker_reloc_ptr(lf, deps->ls_items[j]); 133059751Speter if (nmp->md_type != MDT_VERSION) 133159751Speter continue; 133259751Speter nmodname = linker_reloc_ptr(lf, nmp->md_cval); 133359751Speter if (strcmp(modname, nmodname) == 0) 133459751Speter break; 133559751Speter } 133659751Speter if (j < deps->ls_length) /* early exit, it's a self reference */ 133759751Speter continue; 133859751Speter mod = modlist_lookup(modname); 133959751Speter if (mod) { /* woohoo, it's loaded already */ 134059751Speter lfdep = mod->container; 134159751Speter lfdep->refs++; 134259751Speter error = linker_file_add_dependancy(lf, lfdep); 134359751Speter if (error) 134459751Speter break; 134559751Speter continue; 134659751Speter } 134759751Speter error = linker_load_module(modname, lf); 134859751Speter if (error) { 134959751Speter printf("KLD %s: depends on %s - not available\n", 135059751Speter lf->filename, modname); 135159751Speter break; 135259751Speter } 135359751Speter } 135459751Speter 135559751Speter } 135659751Speter if (error == 0 && deps) { 135759751Speter for (i = 0; i < deps->ls_length; i++) { 135859751Speter mp = linker_reloc_ptr(lf, deps->ls_items[i]); 135959751Speter if (mp->md_type != MDT_VERSION) 136059751Speter continue; 136159751Speter modname = linker_reloc_ptr(lf, mp->md_cval); 136259751Speter mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT); 136359751Speter if (mod == NULL) 136459751Speter panic("no memory for module list"); 136559751Speter bzero(mod, sizeof(*mod)); 136659751Speter mod->container = lf; 136759751Speter mod->name = modname; 136859751Speter TAILQ_INSERT_TAIL(&found_modules, mod, link); 136959751Speter } 137059751Speter } 137159751Speter return error; 137259751Speter} 1373