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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* 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.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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/proc.h>
#include <sys/sched.h>
#include <vm/physmem.h>
#include <vm/dynalloc.h>
#include <vm/vm.h>
/*
* Kill a thread and deallocate its resources.
*
* @td: Thread to exit
*/
int
exit1(struct proc *td)
{
struct pcb *pcbp;
struct proc *curtd;
uintptr_t stack;
pid_t target_pid, curpid;
target_pid = td->pid;
curtd = this_td();
pcbp = &td->pcb;
curpid = curtd->pid;
stack = td->stack_base;
td->flags |= PROC_EXITING;
/*
* If this is on the higher half, it is kernel
* mapped and we need to convert it to a physical
* address.
*/
if (stack >= VM_HIGHER_HALF) {
stack -= VM_HIGHER_HALF;
}
vm_free_frame(stack, PROC_STACK_PAGES);
pmap_destroy_vas(pcbp->addrsp);
dynfree(td);
/*
* If we are the thread exiting, reenter the scheduler
* and do not return.
*/
if (target_pid == curpid)
sched_enter();
return 0;
}
scret_t
sys_exit(struct syscall_args *scargs)
{
exit1(this_td());
__builtin_unreachable();
}
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