diff options
Diffstat (limited to 'sys/arm/arm/stack_machdep.c')
| -rw-r--r-- | sys/arm/arm/stack_machdep.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/sys/arm/arm/stack_machdep.c b/sys/arm/arm/stack_machdep.c new file mode 100644 index 000000000000..7dcf5583d866 --- /dev/null +++ b/sys/arm/arm/stack_machdep.c @@ -0,0 +1,83 @@ +/*- + * 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/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); + + 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); +} |