stack_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause
    3  *
    4  * Copyright (c) 2019 Ian Lepore <ian@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    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.
   14  *
   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
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/types.h>
   32 #include <sys/systm.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/proc.h>
   36 #include <sys/stack.h>
   37 
   38 #include <machine/pcb.h>
   39 #include <machine/stack.h>
   40 
   41 static void
   42 stack_capture(struct stack *st, struct unwind_state *state)
   43 {
   44 
   45         stack_zero(st);
   46         while (unwind_stack_one(state, 0) == 0) {
   47                 if (stack_put(st, state->registers[PC]) == -1)
   48                         break;
   49         }
   50 }
   51 
   52 void
   53 stack_save(struct stack *st)
   54 {
   55         struct unwind_state state;
   56         uint32_t sp;
   57 
   58         /* Read the stack pointer */
   59         __asm __volatile("mov %0, sp" : "=&r" (sp));
   60 
   61         state.registers[FP] = (uint32_t)__builtin_frame_address(0);
   62         state.registers[SP] = sp;
   63         state.registers[LR] = (uint32_t)__builtin_return_address(0);
   64         state.registers[PC] = (uint32_t)stack_save;
   65 
   66         stack_capture(st, &state);
   67 }
   68 
   69 int
   70 stack_save_td(struct stack *st, struct thread *td)
   71 {
   72         struct unwind_state state;
   73 
   74         THREAD_LOCK_ASSERT(td, MA_OWNED);
   75         KASSERT(!TD_IS_SWAPPED(td),
   76             ("stack_save_td: thread %p is swapped", td));
   77 
   78         if (TD_IS_RUNNING(td))
   79                 return (EOPNOTSUPP);
   80 
   81         state.registers[FP] = td->td_pcb->pcb_regs.sf_r11;
   82         state.registers[SP] = td->td_pcb->pcb_regs.sf_sp;
   83         state.registers[LR] = td->td_pcb->pcb_regs.sf_lr;
   84         state.registers[PC] = td->td_pcb->pcb_regs.sf_pc;
   85 
   86         stack_capture(st, &state);
   87         return (0);
   88 }

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FreeBSD/Linux Kernel Cross Reference sys/arm/arm/stack_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/stack_machdep.c