ia32_sigtramp.S

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    1 /*-
    2  * Copyright (c) 2003 Peter Wemm
    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/5.2/sys/compat/ia32/ia32_sigtramp.S 119334 2003-08-22 23:19:02Z peter $
   27  */
   28 
   29 #include "opt_compat.h"
   30 
   31 #include <machine/asmacros.h>
   32 #include <sys/syscall.h>
   33 
   34 #include "ia32_assym.h"
   35 
   36         .text
   37         .code32
   38 /*
   39  * Signal trampoline, copied to top of user stack
   40  * XXX may need to be MD to match backend sendsig handoff protocol
   41  */
   42         ALIGN_TEXT
   43         .globl  ia32_sigcode
   44 ia32_sigcode:
   45         calll   *IA32_SIGF_HANDLER(%esp)
   46         leal    IA32_SIGF_UC(%esp),%eax /* get ucontext */
   47         pushl   %eax
   48         movl    IA32_UC_GS(%eax),%gs    /* restore %gs */
   49         movl    IA32_UC_FS(%eax),%fs    /* restore %fs */
   50         movl    IA32_UC_ES(%eax),%es    /* restore %es */
   51         movl    IA32_UC_DS(%eax),%ds    /* restore %ds */
   52         movl    $SYS_sigreturn,%eax
   53         pushl   %eax                    /* junk to fake return addr. */
   54         int     $0x80                   /* enter kernel with args */
   55                                         /* on stack */
   56 1:
   57         jmp     1b
   58 
   59 #ifdef COMPAT_FREEBSD4
   60         ALIGN_TEXT
   61 freebsd4_ia32_sigcode:
   62         calll   *IA32_SIGF_HANDLER(%esp)
   63         leal    IA32_SIGF_UC4(%esp),%eax/* get ucontext */
   64         pushl   %eax
   65         movl    IA32_UC4_GS(%eax),%gs   /* restore %gs */
   66         movl    IA32_UC4_FS(%eax),%fs   /* restore %fs */
   67         movl    IA32_UC4_ES(%eax),%es   /* restore %es */
   68         movl    IA32_UC4_DS(%eax),%ds   /* restore %ds */
   69         movl    $344,%eax               /* 4.x SYS_sigreturn */
   70         pushl   %eax                    /* junk to fake return addr. */
   71         int     $0x80                   /* enter kernel with args */
   72                                         /* on stack */
   73 1:
   74         jmp     1b
   75 #endif
   76 
   77         ALIGN_TEXT
   78 esigcode:
   79 
   80         .data
   81         .globl  sz_ia32_sigcode
   82 sz_ia32_sigcode:
   83         .long   esigcode-ia32_sigcode
   84 #ifdef COMPAT_FREEBSD4
   85         .globl  sz_freebsd4_ia32_sigcode
   86 sz_freebsd4_ia32_sigcode:
   87         .long   esigcode-freebsd4_ia32_sigcode
   88 #endif

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FreeBSD/Linux Kernel Cross Reference sys/compat/ia32/ia32_sigtramp.S

FreeBSD/Linux Kernel Cross Reference
sys/compat/ia32/ia32_sigtramp.S