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/*
* SPDX-License-Identifier: CDDL 1.0
*
* Copyright 2022 Christos Margiolis <christos@FreeBSD.org>
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/dtrace.h>
#include "kinst.h"
MALLOC_DEFINE(M_KINST, "kinst", "Kernel Instruction Tracing");
static d_open_t kinst_open;
static d_close_t kinst_close;
static d_ioctl_t kinst_ioctl;
static void kinst_provide_module(void *, modctl_t *);
static void kinst_getargdesc(void *, dtrace_id_t, void *,
dtrace_argdesc_t *);
static void kinst_destroy(void *, dtrace_id_t, void *);
static void kinst_enable(void *, dtrace_id_t, void *);
static void kinst_disable(void *, dtrace_id_t, void *);
static int kinst_load(void *);
static int kinst_unload(void *);
static int kinst_modevent(module_t, int, void *);
static dtrace_pattr_t kinst_attr = {
{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
};
static dtrace_pops_t kinst_pops = {
.dtps_provide = NULL,
.dtps_provide_module = kinst_provide_module,
.dtps_enable = kinst_enable,
.dtps_disable = kinst_disable,
.dtps_suspend = NULL,
.dtps_resume = NULL,
.dtps_getargdesc = kinst_getargdesc,
.dtps_getargval = NULL,
.dtps_usermode = NULL,
.dtps_destroy = kinst_destroy
};
static struct cdevsw kinst_cdevsw = {
.d_name = "kinst",
.d_version = D_VERSION,
.d_flags = D_TRACKCLOSE,
.d_open = kinst_open,
.d_close = kinst_close,
.d_ioctl = kinst_ioctl,
};
static dtrace_provider_id_t kinst_id;
struct kinst_probe_list *kinst_probetab;
static struct cdev *kinst_cdev;
void
kinst_probe_create(struct kinst_probe *kp, linker_file_t lf)
{
kp->kp_id = dtrace_probe_create(kinst_id, lf->filename,
kp->kp_func, kp->kp_name, 3, kp);
LIST_INSERT_HEAD(KINST_GETPROBE(kp->kp_patchpoint), kp, kp_hashnext);
}
static int
kinst_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused,
struct thread *td __unused)
{
return (0);
}
static int
kinst_close(struct cdev *dev __unused, int fflag __unused, int devtype __unused,
struct thread *td __unused)
{
dtrace_condense(kinst_id);
return (0);
}
static int
kinst_linker_file_cb(linker_file_t lf, void *arg)
{
dtrace_kinst_probedesc_t *pd;
pd = arg;
if (pd->kpd_mod[0] != '\0' && strcmp(pd->kpd_mod, lf->filename) != 0)
return (0);
/*
* Invoke kinst_make_probe_function() once for each function symbol in
* the module "lf".
*/
return (linker_file_function_listall(lf, kinst_make_probe, arg));
}
static int
kinst_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr,
int flags __unused, struct thread *td __unused)
{
dtrace_kinst_probedesc_t *pd;
int error = 0;
switch (cmd) {
case KINSTIOC_MAKEPROBE:
pd = (dtrace_kinst_probedesc_t *)addr;
pd->kpd_func[sizeof(pd->kpd_func) - 1] = '\0';
pd->kpd_mod[sizeof(pd->kpd_mod) - 1] = '\0';
/* Loop over all functions in the kernel and loaded modules. */
error = linker_file_foreach(kinst_linker_file_cb, pd);
break;
default:
error = ENOTTY;
break;
}
return (error);
}
static void
kinst_provide_module(void *arg, modctl_t *lf)
{
}
static void
kinst_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
{
desc->dtargd_ndx = DTRACE_ARGNONE;
}
static void
kinst_destroy(void *arg, dtrace_id_t id, void *parg)
{
struct kinst_probe *kp = parg;
LIST_REMOVE(kp, kp_hashnext);
free(kp, M_KINST);
}
static void
kinst_enable(void *arg, dtrace_id_t id, void *parg)
{
struct kinst_probe *kp = parg;
static bool warned = false;
if (!warned) {
KINST_LOG(
"kinst: This provider is experimental, exercise caution");
warned = true;
}
kinst_patch_tracepoint(kp, kp->kp_patchval);
}
static void
kinst_disable(void *arg, dtrace_id_t id, void *parg)
{
struct kinst_probe *kp = parg;
kinst_patch_tracepoint(kp, kp->kp_savedval);
}
static int
kinst_load(void *dummy)
{
int error;
error = kinst_trampoline_init();
if (error != 0)
return (error);
error = dtrace_register("kinst", &kinst_attr, DTRACE_PRIV_USER, NULL,
&kinst_pops, NULL, &kinst_id);
if (error != 0) {
kinst_trampoline_deinit();
return (error);
}
kinst_probetab = malloc(KINST_PROBETAB_MAX *
sizeof(struct kinst_probe_list), M_KINST, M_WAITOK | M_ZERO);
for (int i = 0; i < KINST_PROBETAB_MAX; i++)
LIST_INIT(&kinst_probetab[i]);
kinst_cdev = make_dev(&kinst_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
"dtrace/kinst");
dtrace_invop_add(kinst_invop);
return (0);
}
static int
kinst_unload(void *dummy)
{
free(kinst_probetab, M_KINST);
kinst_trampoline_deinit();
dtrace_invop_remove(kinst_invop);
destroy_dev(kinst_cdev);
return (dtrace_unregister(kinst_id));
}
static int
kinst_modevent(module_t mod __unused, int type, void *data __unused)
{
int error = 0;
switch (type) {
case MOD_LOAD:
break;
case MOD_UNLOAD:
break;
case MOD_SHUTDOWN:
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
SYSINIT(kinst_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, kinst_load, NULL);
SYSUNINIT(kinst_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, kinst_unload,
NULL);
DEV_MODULE(kinst, kinst_modevent, NULL);
MODULE_VERSION(kinst, 1);
MODULE_DEPEND(kinst, dtrace, 1, 1, 1);
MODULE_DEPEND(kinst, opensolaris, 1, 1, 1);
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