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/powerpc/powerpc/sigcode64.S

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    1 /* $FreeBSD: releng/11.0/sys/powerpc/powerpc/sigcode64.S 291668 2015-12-03 00:10:57Z nwhitehorn $ */
    2 /* $NetBSD: sigcode.S,v 1.1 1999/11/17 14:56:11 kleink Exp $    */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
    6  * Copyright (C) 1995, 1996 TooLs GmbH.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by TooLs GmbH.
   20  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   29  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   31  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <machine/asm.h>
   36 #include <sys/syscall.h>
   37 #include "assym.s"
   38 
   39 /*
   40  * The following code gets copied to the top of the user stack on process
   41  * execution.  It does signal trampolining on signal delivery.
   42  *
   43  * On entry r1 points to a struct sigframe at bottom of current stack.
   44  * All other registers are unchanged.
   45  *
   46  * Entered midway through for v2 ELF binaries that don't need to deal with
   47  * function descriptors.
   48  *
   49  */
   50         .globl  CNAME(sigcode64),CNAME(szsigcode64)
   51         .globl  CNAME(sigcode64_elfv2),CNAME(szsigcode64_elfv2)
   52 CNAME(sigcode64):
   53         mflr    2                       /* resolve function descriptor */
   54         ld      0,0(2)                  
   55         ld      2,8(2)
   56         mtlr    0
   57 
   58 CNAME(sigcode64_elfv2):
   59         addi    1,1,-112                /* reserved space for callee */
   60         mflr    12                      /* ELFv2 wants the address in r12 */
   61         blrl
   62 
   63         addi    3,1,112+SF_UC           /* restore sp, and get &frame->sf_uc */
   64         li      0,SYS_sigreturn
   65         sc                              /* sigreturn(scp) */
   66         li      0,SYS_exit
   67         sc                              /* exit(errno) */
   68         nop                             /* align to doubleword */
   69 endsigcode64:
   70         
   71         .data
   72 CNAME(szsigcode64):
   73         .long   endsigcode64 - CNAME(sigcode64)
   74 CNAME(szsigcode64_elfv2):
   75         .long   endsigcode64 - CNAME(sigcode64_elfv2)
   76 

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