37889b394a
suitable for holding object pointers (ptrint_t -> uintptr_t). Added corresponding signed type (intptr_t). Changed/added corresponding non-C9x types for function pointers to match. Don't use nonstandard types to implement these types, and don't comment on them in <machine/types.h>.
302 lines
6.7 KiB
C
302 lines
6.7 KiB
C
/*-
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* Copyright (c) 1997 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: kern_module.c,v 1.7 1998/07/11 07:45:40 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/sysproto.h>
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#include <sys/sysent.h>
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#include <sys/module.h>
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#include <sys/linker.h>
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#include <sys/proc.h>
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#define M_MODULE M_TEMP /* XXX */
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typedef TAILQ_HEAD(, module) modulelist_t;
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struct module {
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TAILQ_ENTRY(module) link; /* chain together all modules */
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TAILQ_ENTRY(module) flink; /* all modules in a file */
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struct linker_file* file; /* file which contains this module */
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int refs; /* reference count */
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int id; /* unique id number */
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char *name; /* module name */
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modeventhand_t handler; /* event handler */
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void *arg; /* argument for handler */
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};
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#define MOD_EVENT(mod, type) (mod)->handler((mod), (type), (mod)->arg)
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static modulelist_t modules;
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static int nextid = 1;
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static void module_shutdown(int, void*);
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static void
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module_init(void* arg)
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{
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TAILQ_INIT(&modules);
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at_shutdown(module_shutdown, 0, SHUTDOWN_POST_SYNC);
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}
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SYSINIT(module, SI_SUB_KMEM, SI_ORDER_ANY, module_init, 0);
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static void
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module_shutdown(int arg1, void* arg2)
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{
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module_t mod;
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for (mod = TAILQ_FIRST(&modules); mod; mod = TAILQ_NEXT(mod, link))
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MOD_EVENT(mod, MOD_SHUTDOWN);
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}
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void
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module_register_init(void *arg)
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{
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moduledata_t* data = (moduledata_t*) arg;
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int error;
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if (error = module_register(data->name, data->evhand, data->priv))
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printf("module_register_init: module_register(%s, %lx, %p) returned %d",
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data->name, (u_long)(uintfptr_t)data->evhand, data->priv, error);
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}
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int
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module_register(const char* name, modeventhand_t handler, void* arg)
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{
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size_t namelen;
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module_t newmod;
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int error;
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namelen = strlen(name) + 1;
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newmod = (module_t) malloc(sizeof(struct module) + namelen,
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M_MODULE, M_WAITOK);
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if (newmod == 0)
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return ENOMEM;
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newmod->refs = 1;
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newmod->id = nextid++;
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newmod->name = (char *) (newmod + 1);
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strcpy(newmod->name, name);
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newmod->handler = handler;
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newmod->arg = arg;
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TAILQ_INSERT_TAIL(&modules, newmod, link);
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if (linker_current_file) {
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TAILQ_INSERT_TAIL(&linker_current_file->modules, newmod, flink);
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newmod->file = linker_current_file;
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} else
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newmod->file = 0;
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if (error = MOD_EVENT(newmod, MOD_LOAD)) {
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module_release(newmod);
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return error;
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}
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return 0;
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}
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void
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module_reference(module_t mod)
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{
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MOD_DPF(REFS, ("module_reference: before, refs=%d\n", mod->refs));
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mod->refs++;
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}
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void
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module_release(module_t mod)
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{
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if (mod->refs <= 0)
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panic("module_release: bad reference count");
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MOD_DPF(REFS, ("module_release: before, refs=%d\n", mod->refs));
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mod->refs--;
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if (mod->refs == 0) {
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TAILQ_REMOVE(&modules, mod, link);
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if (mod->file) {
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TAILQ_REMOVE(&mod->file->modules, mod, flink);
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}
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free(mod, M_MODULE);
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}
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}
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module_t
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module_lookupbyname(const char* name)
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{
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module_t mod;
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for (mod = TAILQ_FIRST(&modules); mod; mod = TAILQ_NEXT(mod, link)) {
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if (!strcmp(mod->name, name))
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return mod;
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}
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return 0;
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}
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module_t
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module_lookupbyid(int modid)
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{
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module_t mod;
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for (mod = TAILQ_FIRST(&modules); mod; mod = TAILQ_NEXT(mod, link)) {
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if (mod->id == modid)
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return mod;
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}
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return 0;
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}
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int
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module_unload(module_t mod)
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{
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return MOD_EVENT(mod, MOD_UNLOAD);
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}
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int
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module_getid(module_t mod)
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{
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return mod->id;
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}
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module_t
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module_getfnext(module_t mod)
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{
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return TAILQ_NEXT(mod, flink);
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}
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/*
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* Syscalls.
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*/
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int
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modnext(struct proc* p, struct modnext_args* uap)
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{
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module_t mod;
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p->p_retval[0] = -1;
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if (SCARG(uap, modid) == 0) {
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mod = TAILQ_FIRST(&modules);
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if (mod) {
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p->p_retval[0] = mod->id;
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return 0;
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} else
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return ENOENT;
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}
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mod = module_lookupbyid(SCARG(uap, modid));
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if (!mod)
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return ENOENT;
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if (TAILQ_NEXT(mod, link))
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p->p_retval[0] = TAILQ_NEXT(mod, link)->id;
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else
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p->p_retval[0] = 0;
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return 0;
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}
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int
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modfnext(struct proc* p, struct modfnext_args* uap)
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{
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module_t mod;
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p->p_retval[0] = -1;
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mod = module_lookupbyid(SCARG(uap, modid));
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if (!mod)
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return ENOENT;
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if (TAILQ_NEXT(mod, flink))
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p->p_retval[0] = TAILQ_NEXT(mod, flink)->id;
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else
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p->p_retval[0] = 0;
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return 0;
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}
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int
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modstat(struct proc* p, struct modstat_args* uap)
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{
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module_t mod;
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int error = 0;
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int namelen;
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int version;
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struct module_stat* stat;
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mod = module_lookupbyid(SCARG(uap, modid));
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if (!mod)
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return ENOENT;
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stat = SCARG(uap, stat);
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/*
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* Check the version of the user's structure.
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*/
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if (error = copyin(&stat->version, &version, sizeof(version)))
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goto out;
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if (version != sizeof(struct module_stat)) {
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error = EINVAL;
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goto out;
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}
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namelen = strlen(mod->name) + 1;
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if (namelen > MAXMODNAME)
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namelen = MAXMODNAME;
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if (error = copyout(mod->name, &stat->name[0], namelen))
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goto out;
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if (error = copyout(&mod->refs, &stat->refs, sizeof(int)))
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goto out;
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if (error = copyout(&mod->id, &stat->id, sizeof(int)))
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goto out;
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p->p_retval[0] = 0;
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out:
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return error;
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}
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int
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modfind(struct proc* p, struct modfind_args* uap)
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{
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int error = 0;
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char name[MAXMODNAME];
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module_t mod;
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if (error = copyinstr(SCARG(uap, name), name, sizeof name, 0))
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goto out;
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mod = module_lookupbyname(name);
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if (!mod)
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error = ENOENT;
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else
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p->p_retval[0] = mod->id;
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out:
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return error;
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}
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