2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005 Antoine Brodin
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/stack.h>
37 #include <machine/vmparam.h>
38 #include <machine/pcb.h>
39 #include <machine/stack.h>
42 * This code makes assumptions about the stack layout. These are correct
43 * when using APCS (the old ABI), but are no longer true with AAPCS and the
44 * ARM EABI. There is also an issue with clang and llvm when building for
45 * APCS where it lays out the stack incorrectly. Because of this we disable
46 * this when building for ARM EABI or when building with clang.
49 extern vm_offset_t kernel_vm_end;
52 stack_capture(struct stack *st, u_int32_t *frame)
57 stack_save_td(struct stack *st, struct thread *td)
61 if (TD_IS_SWAPPED(td))
62 panic("stack_save_td: swapped");
63 if (TD_IS_RUNNING(td))
64 panic("stack_save_td: running");
67 * This register, the frame pointer, is incorrect for the ARM EABI
68 * as it doesn't have a frame pointer, however it's value is not used
69 * when building for EABI.
71 frame = (u_int32_t *)td->td_pcb->pcb_regs.sf_r11;
73 stack_capture(st, frame);
77 stack_save_td_running(struct stack *st, struct thread *td)
84 stack_save(struct stack *st)
88 frame = (u_int32_t *)__builtin_frame_address(0);
90 stack_capture(st, frame);