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/arm/arm/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/arm/arm/stack_machdep.c 250810 2013-05-19 16:25:09Z andrew $");
   29 
   30 #include <sys/systm.h>
   31 #include <sys/param.h>
   32 #include <sys/proc.h>
   33 #include <sys/stack.h>
   34 
   35 #include <machine/vmparam.h>
   36 #include <machine/pcb.h>
   37 #include <machine/stack.h>
   38 
   39 /*
   40  * This code makes assumptions about the stack layout. These are correct
   41  * when using APCS (the old ABI), but are no longer true with AAPCS and the
   42  * ARM EABI. There is also an issue with clang and llvm when building for
   43  * APCS where it lays out the stack incorrectly. Because of this we disable
   44  * this when building for ARM EABI or when building with clang.
   45  */
   46 static void
   47 stack_capture(struct stack *st, u_int32_t *frame)
   48 {
   49 #if !defined(__ARM_EABI__) && !defined(__clang__)
   50         vm_offset_t callpc;
   51 
   52         while (INKERNEL(frame)) {
   53                 callpc = frame[FR_SCP];
   54                 if (stack_put(st, callpc) == -1)
   55                         break;
   56                 frame = (u_int32_t *)(frame[FR_RFP]);
   57         }
   58 #endif
   59 }
   60 
   61 void
   62 stack_save_td(struct stack *st, struct thread *td)
   63 {
   64         u_int32_t *frame;
   65 
   66         if (TD_IS_SWAPPED(td))
   67                 panic("stack_save_td: swapped");
   68         if (TD_IS_RUNNING(td))
   69                 panic("stack_save_td: running");
   70 
   71         /*
   72          * This register, the frame pointer, is incorrect for the ARM EABI
   73          * as it doesn't have a frame pointer, however it's value is not used
   74          * when building for EABI.
   75          */
   76         frame = (u_int32_t *)td->td_pcb->un_32.pcb32_r11;
   77         stack_zero(st);
   78         stack_capture(st, frame);
   79 }
   80 
   81 void
   82 stack_save(struct stack *st)
   83 {
   84         u_int32_t *frame;
   85 
   86         frame = (u_int32_t *)__builtin_frame_address(0);
   87         stack_zero(st);
   88         stack_capture(st, frame);
   89 }

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