stack_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005 Antoine Brodin
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/proc.h>
   34 #include <sys/stack.h>
   35 #include <sys/systm.h>
   36 
   37 #include <vm/vm.h>
   38 #include <vm/pmap.h>
   39 #include <vm/vm_extern.h>
   40 
   41 #include <machine/db_machdep.h>
   42 #include <machine/pcb.h>
   43 #include <machine/spr.h>
   44 #include <machine/stack.h>
   45 #include <machine/trap.h>
   46 
   47 #ifdef __powerpc64__
   48 #define CALLOFFSET 8 /* Account for the TOC reload slot */
   49 #else
   50 #define CALLOFFSET 4
   51 #endif
   52 
   53 static void
   54 stack_capture(struct stack *st, vm_offset_t frame)
   55 {
   56         vm_offset_t callpc;
   57 
   58         stack_zero(st);
   59         if (frame < PAGE_SIZE)
   60                 return;
   61         while (1) {
   62                 frame = *(vm_offset_t *)frame;
   63                 if (frame < PAGE_SIZE)
   64                         break;
   65 
   66             #ifdef __powerpc64__
   67                 callpc = *(vm_offset_t *)(frame + 16) - 4;
   68             #else
   69                 callpc = *(vm_offset_t *)(frame + 4) - 4;
   70             #endif
   71                 if ((callpc & 3) || (callpc < 0x100))
   72                         break;
   73 
   74                 /*
   75                  * Don't bother traversing trap-frames - there should
   76                  * be enough info down to the frame to work out where
   77                  * things are going wrong. Plus, prevents this shortened
   78                  * version of code from accessing user-space frames
   79                  */
   80                 if (callpc + CALLOFFSET == (vm_offset_t) &trapexit ||
   81                     callpc + CALLOFFSET == (vm_offset_t) &asttrapexit)
   82                         break;
   83 
   84                 if (stack_put(st, callpc) == -1)
   85                         break;
   86         }
   87 }
   88 
   89 void
   90 stack_save_td(struct stack *st, struct thread *td)
   91 {
   92         vm_offset_t frame;
   93 
   94         if (TD_IS_SWAPPED(td))
   95                 panic("stack_save_td: swapped");
   96         if (TD_IS_RUNNING(td))
   97                 panic("stack_save_td: running");
   98 
   99         frame = td->td_pcb->pcb_sp;
  100         stack_capture(st, frame);
  101 }
  102 
  103 int
  104 stack_save_td_running(struct stack *st, struct thread *td)
  105 {
  106 
  107         return (EOPNOTSUPP);
  108 }
  109 
  110 void
  111 stack_save(struct stack *st)
  112 {
  113         register_t frame;
  114 
  115         frame = (register_t)__builtin_frame_address(0);
  116         stack_capture(st, frame);
  117 }

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

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