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/7.4/sys/powerpc/powerpc/stack_machdep.c 178079 2008-04-10 22:09:25Z rwatson $");
   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 static void
   46 stack_capture(struct stack *st, register_t frame)
   47 {
   48         vm_offset_t callpc;
   49 
   50         stack_zero(st);
   51         if (frame < PAGE_SIZE)
   52                 return;
   53         while (1) {
   54                 frame = *(register_t *)frame;
   55                 if (frame < PAGE_SIZE)
   56                         break;
   57                 callpc = *(vm_offset_t *)(frame + 4) - 4;
   58                 if ((callpc & 3) || (callpc < 0x100))
   59                         break;
   60 
   61                 /*
   62                  * Don't bother traversing trap-frames - there should
   63                  * be enough info down to the frame to work out where
   64                  * things are going wrong. Plus, prevents this shortened
   65                  * version of code from accessing user-space frames
   66                  */
   67                 if (callpc + 4 == (register_t) &trapexit ||
   68                     callpc + 4 == (register_t) &asttrapexit)
   69                         break;
   70 
   71                 if (stack_put(st, callpc) == -1)
   72                         break;
   73         }
   74 }
   75 
   76 void
   77 stack_save_td(struct stack *st, struct thread *td)
   78 {
   79         register_t frame;
   80 
   81         if (TD_IS_SWAPPED(td))
   82                 panic("stack_save_td: swapped");
   83         if (TD_IS_RUNNING(td))
   84                 panic("stack_save_td: running");
   85 
   86         frame = td->td_pcb->pcb_sp;
   87         stack_capture(st, frame);
   88 }
   89 
   90 void
   91 stack_save(struct stack *st)
   92 {
   93         register_t frame;
   94 
   95         frame = (register_t)__builtin_frame_address(1);
   96         stack_capture(st, frame);
   97 }

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

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sys/powerpc/powerpc/stack_machdep.c