2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2019 Ian Lepore <ian@freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/types.h>
32 #include <sys/systm.h>
34 #include <sys/stack.h>
35 #include <machine/pcb.h>
36 #include <machine/stack.h>
39 stack_capture(struct stack *st, struct unwind_state *state)
43 while (unwind_stack_one(state, 0) == 0) {
44 if (stack_put(st, state->registers[PC]) == -1)
50 stack_save(struct stack *st)
52 struct unwind_state state;
55 /* Read the stack pointer */
56 __asm __volatile("mov %0, sp" : "=&r" (sp));
58 state.registers[FP] = (uint32_t)__builtin_frame_address(0);
59 state.registers[SP] = sp;
60 state.registers[LR] = (uint32_t)__builtin_return_address(0);
61 state.registers[PC] = (uint32_t)stack_save;
63 stack_capture(st, &state);
67 stack_save_td(struct stack *st, struct thread *td)
69 struct unwind_state state;
71 KASSERT(!TD_IS_SWAPPED(td), ("stack_save_td: swapped"));
72 KASSERT(!TD_IS_RUNNING(td), ("stack_save_td: running"));
74 state.registers[FP] = td->td_pcb->pcb_regs.sf_r11;
75 state.registers[SP] = td->td_pcb->pcb_regs.sf_sp;
76 state.registers[LR] = td->td_pcb->pcb_regs.sf_lr;
77 state.registers[PC] = td->td_pcb->pcb_regs.sf_pc;
79 stack_capture(st, &state);
83 stack_save_td_running(struct stack *st, struct thread *td)
86 if (td == curthread) {