xref: /freebsd-11.0-release/sys/arm64/arm64/stack_machdep.c

/*-
 * Copyright (c) 2015 The FreeBSD Foundation
 * All rights reserved.
 *
 * This software was developed by Andrew Turner under
 * sponsorship from the FreeBSD Foundation.
 *
 * 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/cdefs.h>
__FBSDID("$FreeBSD: releng/11.0/sys/arm64/arm64/stack_machdep.c 287645 2015-09-11 03:54:37Z markj $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/stack.h>

#include <machine/vmparam.h>
#include <machine/pcb.h>
#include <machine/stack.h>

static void
stack_capture(struct stack *st, struct unwind_state *frame)
{

	stack_zero(st);
	while (1) {
		unwind_frame(frame);
		if (!INKERNEL((vm_offset_t)frame->fp) ||
		     !INKERNEL((vm_offset_t)frame->pc))
			break;
		if (stack_put(st, frame->pc) == -1)
			break;
	}
}

void
stack_save_td(struct stack *st, struct thread *td)
{
	struct unwind_state frame;

	if (TD_IS_SWAPPED(td))
		panic("stack_save_td: swapped");
	if (TD_IS_RUNNING(td))
		panic("stack_save_td: running");

	frame.sp = td->td_pcb->pcb_sp;
	frame.fp = td->td_pcb->pcb_x[29];
	frame.pc = td->td_pcb->pcb_x[30];

	stack_capture(st, &frame);
}

int
stack_save_td_running(struct stack *st, struct thread *td)
{

	return (EOPNOTSUPP);
}

void
stack_save(struct stack *st)
{
	struct unwind_state frame;
	uint64_t sp;

	__asm __volatile("mov %0, sp" : "=&r" (sp));

	frame.sp = sp;
	frame.fp = (uint64_t)__builtin_frame_address(0);
	frame.pc = (uint64_t)stack_save;

	stack_capture(st, &frame);
}