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/powerpc/powerpc/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/10.0/sys/powerpc/powerpc/stack_machdep.c 209975 2010-07-13 05:32:19Z nwhitehorn $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/proc.h>
   32 #include <sys/stack.h>
   33 #include <sys/systm.h>
   34 
   35 #include <vm/vm.h>
   36 #include <vm/pmap.h>
   37 #include <vm/vm_extern.h>
   38 
   39 #include <machine/db_machdep.h>
   40 #include <machine/pcb.h>
   41 #include <machine/spr.h>
   42 #include <machine/stack.h>
   43 #include <machine/trap.h>
   44 
   45 #ifdef __powerpc64__
   46 #define CALLOFFSET 8 /* Account for the TOC reload slot */
   47 #else
   48 #define CALLOFFSET 4
   49 #endif
   50 
   51 static void
   52 stack_capture(struct stack *st, vm_offset_t frame)
   53 {
   54         vm_offset_t callpc;
   55 
   56         stack_zero(st);
   57         if (frame < PAGE_SIZE)
   58                 return;
   59         while (1) {
   60                 frame = *(vm_offset_t *)frame;
   61                 if (frame < PAGE_SIZE)
   62                         break;
   63 
   64             #ifdef __powerpc64__
   65                 callpc = *(vm_offset_t *)(frame + 16) - 4;
   66             #else
   67                 callpc = *(vm_offset_t *)(frame + 4) - 4;
   68             #endif
   69                 if ((callpc & 3) || (callpc < 0x100))
   70                         break;
   71 
   72                 /*
   73                  * Don't bother traversing trap-frames - there should
   74                  * be enough info down to the frame to work out where
   75                  * things are going wrong. Plus, prevents this shortened
   76                  * version of code from accessing user-space frames
   77                  */
   78                 if (callpc + CALLOFFSET == (vm_offset_t) &trapexit ||
   79                     callpc + CALLOFFSET == (vm_offset_t) &asttrapexit)
   80                         break;
   81 
   82                 if (stack_put(st, callpc) == -1)
   83                         break;
   84         }
   85 }
   86 
   87 void
   88 stack_save_td(struct stack *st, struct thread *td)
   89 {
   90         vm_offset_t frame;
   91 
   92         if (TD_IS_SWAPPED(td))
   93                 panic("stack_save_td: swapped");
   94         if (TD_IS_RUNNING(td))
   95                 panic("stack_save_td: running");
   96 
   97         frame = td->td_pcb->pcb_sp;
   98         stack_capture(st, frame);
   99 }
  100 
  101 void
  102 stack_save(struct stack *st)
  103 {
  104         register_t frame;
  105 
  106         frame = (register_t)__builtin_frame_address(1);
  107         stack_capture(st, frame);
  108 }

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