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1c29da0279
After r355784 the td_oncpu field is no longer synchronized by the thread lock, so the stack capture interrupt cannot be delievered precisely. Fix this using a loop which drops the thread lock and restarts if the wrong thread was sampled from the stack capture interrupt handler. Change the implementation to use a regular interrupt instead of an NMI. Now that we drop the thread lock, there is no advantage to the latter. Simplify the KPIs. Remove stack_save_td_running() and add a return value to stack_save_td(). On platforms that do not support stack capture of running threads, stack_save_td() returns EOPNOTSUPP. If the target thread is running in user mode, stack_save_td() returns EBUSY. Reviewed by: kib Reported by: mjg, pho Tested by: pho Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D23355
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Ian Lepore <ian@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/stack.h>
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#include <machine/pcb.h>
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#include <machine/stack.h>
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static void
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stack_capture(struct stack *st, struct unwind_state *state)
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{
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stack_zero(st);
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while (unwind_stack_one(state, 0) == 0) {
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if (stack_put(st, state->registers[PC]) == -1)
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break;
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}
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}
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void
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stack_save(struct stack *st)
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{
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struct unwind_state state;
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uint32_t sp;
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/* Read the stack pointer */
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__asm __volatile("mov %0, sp" : "=&r" (sp));
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state.registers[FP] = (uint32_t)__builtin_frame_address(0);
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state.registers[SP] = sp;
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state.registers[LR] = (uint32_t)__builtin_return_address(0);
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state.registers[PC] = (uint32_t)stack_save;
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stack_capture(st, &state);
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}
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int
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stack_save_td(struct stack *st, struct thread *td)
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{
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struct unwind_state state;
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THREAD_LOCK_ASSERT(td, MA_OWNED);
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KASSERT(!TD_IS_SWAPPED(td),
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("stack_save_td: thread %p is swapped", td));
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if (TD_IS_RUNNING(td))
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return (EOPNOTSUPP);
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state.registers[FP] = td->td_pcb->pcb_regs.sf_r11;
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state.registers[SP] = td->td_pcb->pcb_regs.sf_sp;
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state.registers[LR] = td->td_pcb->pcb_regs.sf_lr;
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state.registers[PC] = td->td_pcb->pcb_regs.sf_pc;
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stack_capture(st, &state);
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return (0);
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}
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