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/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/proc.h>
   36 #include <sys/stack.h>
   37 #include <sys/systm.h>
   38 
   39 #include <vm/vm.h>
   40 #include <vm/pmap.h>
   41 #include <vm/vm_extern.h>
   42 
   43 #include <machine/db_machdep.h>
   44 #include <machine/pcb.h>
   45 #include <machine/spr.h>
   46 #include <machine/stack.h>
   47 #include <machine/trap.h>
   48 
   49 #ifdef __powerpc64__
   50 #define CALLOFFSET 8 /* Account for the TOC reload slot */
   51 #else
   52 #define CALLOFFSET 4
   53 #endif
   54 
   55 static void
   56 stack_capture(struct stack *st, vm_offset_t frame)
   57 {
   58         vm_offset_t callpc;
   59 
   60         stack_zero(st);
   61         if (frame < PAGE_SIZE)
   62                 return;
   63         while (1) {
   64                 frame = *(vm_offset_t *)frame;
   65                 if (frame < PAGE_SIZE)
   66                         break;
   67 
   68             #ifdef __powerpc64__
   69                 callpc = *(vm_offset_t *)(frame + 16) - 4;
   70             #else
   71                 callpc = *(vm_offset_t *)(frame + 4) - 4;
   72             #endif
   73                 if ((callpc & 3) || (callpc < 0x100))
   74                         break;
   75 
   76                 /*
   77                  * Don't bother traversing trap-frames - there should
   78                  * be enough info down to the frame to work out where
   79                  * things are going wrong. Plus, prevents this shortened
   80                  * version of code from accessing user-space frames
   81                  */
   82                 if (callpc + CALLOFFSET == (vm_offset_t) &trapexit ||
   83                     callpc + CALLOFFSET == (vm_offset_t) &asttrapexit)
   84                         break;
   85 
   86                 if (stack_put(st, callpc) == -1)
   87                         break;
   88         }
   89 }
   90 
   91 int
   92 stack_save_td(struct stack *st, struct thread *td)
   93 {
   94         vm_offset_t frame;
   95 
   96         THREAD_LOCK_ASSERT(td, MA_OWNED);
   97         KASSERT(!TD_IS_SWAPPED(td),
   98             ("stack_save_td: thread %p is swapped", td));
   99 
  100         if (TD_IS_RUNNING(td))
  101                 return (EOPNOTSUPP);
  102 
  103         frame = td->td_pcb->pcb_sp;
  104         stack_capture(st, frame);
  105         return (0);
  106 }
  107 
  108 void
  109 stack_save(struct stack *st)
  110 {
  111         register_t frame;
  112 
  113         frame = (register_t)__builtin_frame_address(0);
  114         stack_capture(st, frame);
  115 }

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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