unwind.c

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    1 /*-
    2  * Copyright (c) 2015 The FreeBSD Foundation
    3  *
    4  * This software was developed by Semihalf under
    5  * the sponsorship of the FreeBSD Foundation.
    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 #include <sys/param.h>
   32 #include <sys/proc.h>
   33 
   34 #include <machine/stack.h>
   35 #include <machine/vmparam.h>
   36 
   37 bool
   38 unwind_frame(struct thread *td, struct unwind_state *frame)
   39 {
   40         uintptr_t fp;
   41 
   42         fp = frame->fp;
   43 
   44         if (!__is_aligned(fp, sizeof(fp)) ||
   45             !kstack_contains(td, fp, sizeof(fp) * 2))
   46                 return (false);
   47 
   48         /* FP to previous frame (X29) */
   49         frame->fp = ((uintptr_t *)fp)[0];
   50         /* LR (X30) */
   51         frame->pc = ADDR_MAKE_CANONICAL(((uintptr_t *)fp)[1] - 4);
   52 
   53         return (true);
   54 }

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FreeBSD/Linux Kernel Cross Reference sys/arm64/arm64/unwind.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/arm64/unwind.c