The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/stack_machdep.c

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    1 /*-
    2  * Copyright (c) 2005 Antoine Brodin
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/9.1/sys/amd64/amd64/stack_machdep.c 174195 2007-12-02 20:40:35Z rwatson $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/proc.h>
   33 #include <sys/stack.h>
   34 
   35 #include <machine/pcb.h>
   36 #include <machine/stack.h>
   37 
   38 #include <vm/vm.h>
   39 #include <vm/vm_param.h>
   40 #include <vm/pmap.h>
   41 
   42 static void
   43 stack_capture(struct stack *st, register_t rbp)
   44 {
   45         struct amd64_frame *frame;
   46         vm_offset_t callpc;
   47 
   48         stack_zero(st);
   49         frame = (struct amd64_frame *)rbp;
   50         while (1) {
   51                 if (!INKERNEL((long)frame))
   52                         break;
   53                 callpc = frame->f_retaddr;
   54                 if (!INKERNEL(callpc))
   55                         break;
   56                 if (stack_put(st, callpc) == -1)
   57                         break;
   58                 if (frame->f_frame <= frame ||
   59                     (vm_offset_t)frame->f_frame >=
   60                     (vm_offset_t)rbp + KSTACK_PAGES * PAGE_SIZE)
   61                         break;
   62                 frame = frame->f_frame;
   63         }
   64 }
   65 
   66 void
   67 stack_save_td(struct stack *st, struct thread *td)
   68 {
   69         register_t rbp;
   70 
   71         if (TD_IS_SWAPPED(td))
   72                 panic("stack_save_td: swapped");
   73         if (TD_IS_RUNNING(td))
   74                 panic("stack_save_td: running");
   75 
   76         rbp = td->td_pcb->pcb_rbp;
   77         stack_capture(st, rbp);
   78 }
   79 
   80 void
   81 stack_save(struct stack *st)
   82 {
   83         register_t rbp;
   84 
   85         __asm __volatile("movq %%rbp,%0" : "=r" (rbp));
   86         stack_capture(st, rbp);
   87 }

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