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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023-2025 Ruslan Bukin <br@bsdpad.com>
*
* This work was supported by Innovate UK project 105694, "Digital Security
* by Design (DSbD) Technology Platform Prototype".
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/refcount.h>
#include <sys/rwlock.h>
#include <sys/hwt.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_object.h>
#include <vm/vm_pager.h>
#include <vm/vm_pageout.h>
#include <vm/vm_phys.h>
#include <dev/hwt/hwt_hook.h>
#include <dev/hwt/hwt_context.h>
#include <dev/hwt/hwt_contexthash.h>
#include <dev/hwt/hwt_config.h>
#include <dev/hwt/hwt_thread.h>
#include <dev/hwt/hwt_owner.h>
#include <dev/hwt/hwt_ownerhash.h>
#include <dev/hwt/hwt_backend.h>
#include <dev/hwt/hwt_vm.h>
#include <dev/hwt/hwt_record.h>
#define HWT_THREAD_DEBUG
#undef HWT_THREAD_DEBUG
#ifdef HWT_THREAD_DEBUG
#define dprintf(fmt, ...) printf(fmt, ##__VA_ARGS__)
#else
#define dprintf(fmt, ...)
#endif
static MALLOC_DEFINE(M_HWT_THREAD, "hwt_thread", "Hardware Trace");
struct hwt_thread *
hwt_thread_first(struct hwt_context *ctx)
{
struct hwt_thread *thr;
HWT_CTX_ASSERT_LOCKED(ctx);
thr = TAILQ_FIRST(&ctx->threads);
KASSERT(thr != NULL, ("thr is NULL"));
return (thr);
}
/*
* To use by hwt_switch_in/out() only.
*/
struct hwt_thread *
hwt_thread_lookup(struct hwt_context *ctx, struct thread *td)
{
struct hwt_thread *thr;
/* Caller of this func holds ctx refcnt right here. */
HWT_CTX_LOCK(ctx);
TAILQ_FOREACH(thr, &ctx->threads, next) {
if (thr->td == td) {
HWT_CTX_UNLOCK(ctx);
return (thr);
}
}
HWT_CTX_UNLOCK(ctx);
/*
* We are here because the hook on thread creation failed to allocate
* a thread.
*/
return (NULL);
}
int
hwt_thread_alloc(struct hwt_thread **thr0, char *path, size_t bufsize,
int kva_req)
{
struct hwt_thread *thr;
struct hwt_vm *vm;
int error;
error = hwt_vm_alloc(bufsize, kva_req, path, &vm);
if (error)
return (error);
thr = malloc(sizeof(struct hwt_thread), M_HWT_THREAD,
M_WAITOK | M_ZERO);
thr->vm = vm;
mtx_init(&thr->mtx, "thr", NULL, MTX_DEF);
refcount_init(&thr->refcnt, 1);
vm->thr = thr;
*thr0 = thr;
return (0);
}
void
hwt_thread_free(struct hwt_thread *thr)
{
hwt_vm_free(thr->vm);
/* Free private backend data, if any. */
if (thr->private != NULL)
hwt_backend_thread_free(thr);
free(thr, M_HWT_THREAD);
}
/*
* Inserts a new thread and a thread creation record into the
* context notifies userspace about the newly created thread.
*/
void
hwt_thread_insert(struct hwt_context *ctx, struct hwt_thread *thr,
struct hwt_record_entry *entry)
{
HWT_CTX_ASSERT_LOCKED(ctx);
TAILQ_INSERT_TAIL(&ctx->threads, thr, next);
TAILQ_INSERT_TAIL(&ctx->records, entry, next);
}
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