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/amd64/amd64/sigtramp.S

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    1 /*-
    2  * Copyright (c) 2003 Peter Wemm <peter@freeBSD.org>
    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  * $FreeBSD: releng/8.1/sys/amd64/amd64/sigtramp.S 114349 2003-05-01 01:05:25Z peter $
   27  */
   28 
   29 #include <sys/syscall.h>
   30 
   31 #include <machine/asmacros.h>
   32 
   33 #include "assym.s"
   34 
   35         .text
   36 /**********************************************************************
   37  *
   38  * Signal trampoline, copied to top of user stack
   39  *
   40  */
   41 NON_GPROF_ENTRY(sigcode)
   42         call    *SIGF_HANDLER(%rsp)     /* call signal handler */
   43         lea     SIGF_UC(%rsp),%rdi      /* get ucontext_t */
   44         pushq   $0                      /* junk to fake return addr. */
   45         movq    $SYS_sigreturn,%rax
   46         syscall                         /* enter kernel with args */
   47 0:      hlt                             /* trap priviliged instruction */
   48         jmp     0b
   49 
   50         ALIGN_TEXT
   51 esigcode:
   52 
   53         .data
   54         .globl  szsigcode
   55 szsigcode:
   56         .long   esigcode-sigcode

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