stack_machdep.c

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    1 /*-
    2  * Copyright (c) 2015 The FreeBSD Foundation
    3  * All rights reserved.
    4  *
    5  * This software was developed by Andrew Turner under
    6  * sponsorship from the FreeBSD Foundation.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/11.2/sys/arm64/arm64/stack_machdep.c 287645 2015-09-11 03:54:37Z markj $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/proc.h>
   37 #include <sys/stack.h>
   38 
   39 #include <machine/vmparam.h>
   40 #include <machine/pcb.h>
   41 #include <machine/stack.h>
   42 
   43 static void
   44 stack_capture(struct stack *st, struct unwind_state *frame)
   45 {
   46 
   47         stack_zero(st);
   48         while (1) {
   49                 unwind_frame(frame);
   50                 if (!INKERNEL((vm_offset_t)frame->fp) ||
   51                      !INKERNEL((vm_offset_t)frame->pc))
   52                         break;
   53                 if (stack_put(st, frame->pc) == -1)
   54                         break;
   55         }
   56 }
   57 
   58 void
   59 stack_save_td(struct stack *st, struct thread *td)
   60 {
   61         struct unwind_state frame;
   62 
   63         if (TD_IS_SWAPPED(td))
   64                 panic("stack_save_td: swapped");
   65         if (TD_IS_RUNNING(td))
   66                 panic("stack_save_td: running");
   67 
   68         frame.sp = td->td_pcb->pcb_sp;
   69         frame.fp = td->td_pcb->pcb_x[29];
   70         frame.pc = td->td_pcb->pcb_x[30];
   71 
   72         stack_capture(st, &frame);
   73 }
   74 
   75 int
   76 stack_save_td_running(struct stack *st, struct thread *td)
   77 {
   78 
   79         return (EOPNOTSUPP);
   80 }
   81 
   82 void
   83 stack_save(struct stack *st)
   84 {
   85         struct unwind_state frame;
   86         uint64_t sp;
   87 
   88         __asm __volatile("mov %0, sp" : "=&r" (sp));
   89 
   90         frame.sp = sp;
   91         frame.fp = (uint64_t)__builtin_frame_address(0);
   92         frame.pc = (uint64_t)stack_save;
   93 
   94         stack_capture(st, &frame);
   95 }

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FreeBSD/Linux Kernel Cross Reference sys/arm64/arm64/stack_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/arm64/stack_machdep.c