static int
linker_file_register_modules(linker_file_t lf)
{
struct mod_metadata **start, **stop, **mdp;
const moduledata_t *moddata;
int first_error, error;
KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
" in %s\n", lf->filename));
start = SET_BEGIN(modmetadata_set);
stop = SET_LIMIT(modmetadata_set);
first_error = 0;
for (mdp = start; mdp < stop; mdp++) {
if ((*mdp)->md_type != MDT_MODULE)
continue;
moddata = (*mdp)->md_data;
KLD_DPF(FILE, ("Registering module %s in %s\n",
moddata->name, lf->filename));
error = module_register(moddata, lf);
if (error) {
printf("Module %s failed to register: %d\n",
moddata->name, error);
if (first_error == 0)
first_error = error;
}
}
return (first_error);
}
int
linker_file_unload(linker_file_t file)
{
module_t mod, next;
struct common_symbol* cp;
int error = 0;
int i;
KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
lockmgr(&lock, LK_EXCLUSIVE|LK_RETRY, 0, curproc);
if (file->refs == 1) {
KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
/*
* Inform any modules associated with this file.
*/
for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
next = module_getfnext(mod);
/*
* Give the module a chance to veto the unload.
*/
if (error = module_unload(mod)) {
KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
mod));
lockmgr(&lock, LK_RELEASE, 0, curproc);
goto out;
}
module_release(mod);
}
}
file->refs--;
if (file->refs > 0) {
lockmgr(&lock, LK_RELEASE, 0, curproc);
goto out;
}
linker_file_sysuninit(file);
TAILQ_REMOVE(&files, file, link);
lockmgr(&lock, LK_RELEASE, 0, curproc);
for (i = 0; i < file->ndeps; i++)
linker_file_unload(file->deps[i]);
free(file->deps, M_LINKER);
for (cp = STAILQ_FIRST(&file->common); cp;
cp = STAILQ_FIRST(&file->common)) {
STAILQ_REMOVE(&file->common, cp, common_symbol, link);
free(cp, M_LINKER);
}
file->ops->unload(file);
free(file, M_LINKER);
out:
return error;
}
int
linker_load_file(const char* filename, linker_file_t* result)
{
linker_class_t lc;
linker_file_t lf;
int foundfile, error = 0;
char *koname = NULL;
lf = linker_find_file_by_name(filename);
if (lf) {
KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename));
*result = lf;
lf->refs++;
goto out;
}
koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
if (koname == NULL) {
error = ENOMEM;
goto out;
}
sprintf(koname, "%s.ko", filename);
lf = NULL;
foundfile = 0;
for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n",
filename, lc->desc));
error = lc->ops->load_file(koname, &lf); /* First with .ko */
if (lf == NULL && error == ENOENT)
error = lc->ops->load_file(filename, &lf); /* Then try without */
/*
* If we got something other than ENOENT, then it exists but we cannot
* load it for some other reason.
*/
if (error != ENOENT)
foundfile = 1;
if (lf) {
linker_file_sysinit(lf);
*result = lf;
error = 0;
goto out;
}
}
/*
* Less than ideal, but tells the user whether it failed to load or
* the module was not found.
*/
if (foundfile)
error = ENOEXEC; /* Format not recognised (or unloadable) */
else
error = ENOENT; /* Nothing found */
out:
if (koname)
free(koname, M_LINKER);
return error;
}
static void
linker_file_sysuninit(linker_file_t lf)
{
struct linker_set* sysuninits;
struct sysinit** sipp;
struct sysinit** xipp;
struct sysinit* save;
KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
lf->filename));
sysuninits = (struct linker_set*)
linker_file_lookup_symbol(lf, "sysuninit_set", 0);
KLD_DPF(FILE, ("linker_file_sysuninit: SYSUNINITs %p\n", sysuninits));
if (!sysuninits)
return;
/*
* Perform a reverse bubble sort of the system initialization objects
* by their subsystem (primary key) and order (secondary key).
*
* Since some things care about execution order, this is the
* operation which ensures continued function.
*/
for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) {
for (xipp = sipp + 1; *xipp; xipp++) {
if ((*sipp)->subsystem >= (*xipp)->subsystem ||
((*sipp)->subsystem == (*xipp)->subsystem &&
(*sipp)->order >= (*xipp)->order))
continue; /* skip*/
save = *sipp;
*sipp = *xipp;
*xipp = save;
}
}
/*
* Traverse the (now) ordered list of system initialization tasks.
* Perform each task, and continue on to the next task.
*/
for (sipp = (struct sysinit **)sysuninits->ls_items; *sipp; sipp++) {
if ((*sipp)->subsystem == SI_SUB_DUMMY)
continue; /* skip dummy task(s)*/
switch ((*sipp)->type) {
case SI_TYPE_DEFAULT:
/* no special processing*/
(*((*sipp)->func))((*sipp)->udata);
break;
default:
panic("linker_file_sysuninit: unrecognized uninit type");
}
}
}
int
kldunload(struct proc* p, struct kldunload_args* uap)
{
linker_file_t lf;
int error = 0;
if (securelevel > 0)
return EPERM;
if (error = suser(p->p_ucred, &p->p_acflag))
return error;
lf = linker_find_file_by_id(SCARG(uap, fileid));
if (lf) {
KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
if (lf->userrefs == 0) {
printf("linkerunload: attempt to unload file which was not loaded by user\n");
error = EBUSY;
goto out;
}
error = linker_file_unload(lf);
if (error)
goto out;
lf->userrefs--;
} else
error = ENOENT;
out:
return error;
}
linker_file_t
linker_make_file(const char* pathname, void* priv, struct linker_file_ops* ops)
{
linker_file_t lf = 0;
int namelen;
const char *filename;
filename = rindex(pathname, '/');
if (filename && filename[1])
filename++;
else
filename = pathname;
KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
lockmgr(&lock, LK_EXCLUSIVE|LK_RETRY, 0, curproc);
namelen = strlen(filename) + 1;
lf = malloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK);
if (!lf)
goto out;
bzero(lf, sizeof(*lf));
lf->refs = 1;
lf->userrefs = 0;
lf->filename = (char*) (lf + 1);
strcpy(lf->filename, filename);
lf->id = next_file_id++;
lf->ndeps = 0;
lf->deps = NULL;
STAILQ_INIT(&lf->common);
TAILQ_INIT(&lf->modules);
lf->priv = priv;
lf->ops = ops;
TAILQ_INSERT_TAIL(&files, lf, link);
out:
lockmgr(&lock, LK_RELEASE, 0, curproc);
return lf;
}
static void
linker_file_sysinit(linker_file_t lf)
{
struct linker_set* sysinits;
struct sysinit** sipp;
struct sysinit** xipp;
struct sysinit* save;
moduledata_t *moddata;
KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
lf->filename));
sysinits = (struct linker_set*)
linker_file_lookup_symbol(lf, "sysinit_set", 0);
KLD_DPF(FILE, ("linker_file_sysinit: SYSINITs %p\n", sysinits));
if (!sysinits)
return;
/* HACK ALERT! */
for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
if ((*sipp)->func == module_register_init) {
moddata = (*sipp)->udata;
moddata->_file = lf;
}
}
/*
* Perform a bubble sort of the system initialization objects by
* their subsystem (primary key) and order (secondary key).
*
* Since some things care about execution order, this is the
* operation which ensures continued function.
*/
for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
for (xipp = sipp + 1; *xipp; xipp++) {
if ((*sipp)->subsystem <= (*xipp)->subsystem ||
((*sipp)->subsystem == (*xipp)->subsystem &&
(*sipp)->order <= (*xipp)->order))
continue; /* skip*/
save = *sipp;
*sipp = *xipp;
*xipp = save;
}
}
/*
* Traverse the (now) ordered list of system initialization tasks.
* Perform each task, and continue on to the next task.
*/
for (sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
if ((*sipp)->subsystem == SI_SUB_DUMMY)
continue; /* skip dummy task(s)*/
switch ((*sipp)->type) {
case SI_TYPE_DEFAULT:
/* no special processing*/
(*((*sipp)->func))((*sipp)->udata);
break;
case SI_TYPE_KTHREAD:
#if !defined(SMP)
/* kernel thread*/
if (fork1(&proc0, RFFDG|RFPROC|RFMEM))
panic("fork kernel thread");
cpu_set_fork_handler(pfind(proc0.p_retval[0]),
(*sipp)->func, (*sipp)->udata);
break;
#endif
case SI_TYPE_KPROCESS:
/* kernel thread*/
if (fork1(&proc0, RFFDG|RFPROC))
panic("fork kernel process");
cpu_set_fork_handler(pfind(proc0.p_retval[0]),
(*sipp)->func, (*sipp)->udata);
break;
default:
panic ("linker_file_sysinit: unrecognized init type");
}
}
}
caddr_t
linker_file_lookup_symbol(linker_file_t file, const char* name, int deps)
{
linker_sym_t sym;
linker_symval_t symval;
linker_file_t lf;
caddr_t address;
size_t common_size = 0;
int i;
KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d\n",
file, name, deps));
if (file->ops->lookup_symbol(file, name, &sym) == 0) {
file->ops->symbol_values(file, sym, &symval);
if (symval.value == 0)
/*
* For commons, first look them up in the dependancies and
* only allocate space if not found there.
*/
common_size = symval.size;
else {
KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol.value=%x\n", symval.value));
return symval.value;
}
}
if (deps) {
for (i = 0; i < file->ndeps; i++) {
address = linker_file_lookup_symbol(file->deps[i], name, 0);
if (address) {
KLD_DPF(SYM, ("linker_file_lookup_symbol: deps value=%x\n", address));
return address;
}
}
/* If we have not found it in the dependencies, search globally */
for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link)) {
/* But skip the current file if it's on the list */
if (lf == file)
continue;
/* And skip the files we searched above */
for (i = 0; i < file->ndeps; i++)
if (lf == file->deps[i])
break;
if (i < file->ndeps)
continue;
address = linker_file_lookup_symbol(lf, name, 0);
if (address) {
KLD_DPF(SYM, ("linker_file_lookup_symbol: global value=%x\n", address));
return address;
}
}
}
if (common_size > 0) {
/*
* This is a common symbol which was not found in the
* dependancies. We maintain a simple common symbol table in
* the file object.
*/
struct common_symbol* cp;
for (cp = STAILQ_FIRST(&file->common); cp;
cp = STAILQ_NEXT(cp, link))
if (!strcmp(cp->name, name)) {
KLD_DPF(SYM, ("linker_file_lookup_symbol: old common value=%x\n", cp->address));
return cp->address;
}
/*
* Round the symbol size up to align.
*/
common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
cp = malloc(sizeof(struct common_symbol)
+ common_size
+ strlen(name) + 1,
M_LINKER, M_WAITOK);
if (!cp) {
KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n"));
return 0;
}
bzero(cp, sizeof(struct common_symbol) + common_size + strlen(name)+ 1);
cp->address = (caddr_t) (cp + 1);
cp->name = cp->address + common_size;
strcpy(cp->name, name);
bzero(cp->address, common_size);
STAILQ_INSERT_TAIL(&file->common, cp, link);
KLD_DPF(SYM, ("linker_file_lookup_symbol: new common value=%x\n", cp->address));
return cp->address;
}
KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
return 0;
}
