1/*-
2 * Copyright (c) 2005 Antoine Brodin
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/arm/arm/stack_machdep.c 314530 2017-03-02 01:18:46Z ian $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/proc.h>
33#include <sys/stack.h>
34
35#include <machine/vmparam.h>
36#include <machine/pcb.h>
37#include <machine/stack.h>
38
39/*
40 * This code makes assumptions about the stack layout. These are correct
41 * when using APCS (the old ABI), but are no longer true with AAPCS and the
42 * ARM EABI. There is also an issue with clang and llvm when building for
43 * APCS where it lays out the stack incorrectly. Because of this we disable
44 * this when building for ARM EABI or when building with clang.
45 */
46
47extern vm_offset_t kernel_vm_end;
48
49static void
50stack_capture(struct stack *st, u_int32_t *frame)
51{
52}
53
54void
55stack_save_td(struct stack *st, struct thread *td)
56{
57	u_int32_t *frame;
58
59	if (TD_IS_SWAPPED(td))
60		panic("stack_save_td: swapped");
61	if (TD_IS_RUNNING(td))
62		panic("stack_save_td: running");
63
64	/*
65	 * This register, the frame pointer, is incorrect for the ARM EABI
66	 * as it doesn't have a frame pointer, however it's value is not used
67	 * when building for EABI.
68	 */
69	frame = (u_int32_t *)td->td_pcb->pcb_regs.sf_r11;
70	stack_zero(st);
71	stack_capture(st, frame);
72}
73
74int
75stack_save_td_running(struct stack *st, struct thread *td)
76{
77
78	return (EOPNOTSUPP);
79}
80
81void
82stack_save(struct stack *st)
83{
84	u_int32_t *frame;
85
86	frame = (u_int32_t *)__builtin_frame_address(0);
87	stack_zero(st);
88	stack_capture(st, frame);
89}
90