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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Ian Lepore <ian@freebsd.org>
*
* 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("$FreeBSD$");
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/stack.h>
#include <machine/pcb.h>
#include <machine/stack.h>
static void
stack_capture(struct stack *st, struct unwind_state *state)
{
stack_zero(st);
while (unwind_stack_one(state, 0) == 0) {
if (stack_put(st, state->registers[PC]) == -1)
break;
}
}
void
stack_save(struct stack *st)
{
struct unwind_state state;
uint32_t sp;
/* Read the stack pointer */
__asm __volatile("mov %0, sp" : "=&r" (sp));
state.registers[FP] = (uint32_t)__builtin_frame_address(0);
state.registers[SP] = sp;
state.registers[LR] = (uint32_t)__builtin_return_address(0);
state.registers[PC] = (uint32_t)stack_save;
stack_capture(st, &state);
}
int
stack_save_td(struct stack *st, struct thread *td)
{
struct unwind_state state;
THREAD_LOCK_ASSERT(td, MA_OWNED);
KASSERT(!TD_IS_SWAPPED(td),
("stack_save_td: thread %p is swapped", td));
if (TD_IS_RUNNING(td))
return (EOPNOTSUPP);
state.registers[FP] = td->td_pcb->pcb_regs.sf_r11;
state.registers[SP] = td->td_pcb->pcb_regs.sf_sp;
state.registers[LR] = td->td_pcb->pcb_regs.sf_lr;
state.registers[PC] = td->td_pcb->pcb_regs.sf_pc;
stack_capture(st, &state);
return (0);
}
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