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/i386/i386/sigtramp.s

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)locore.s      7.3 (Berkeley) 5/13/91
   33  * $FreeBSD: releng/11.2/sys/i386/i386/sigtramp.s 329199 2018-02-13 12:54:03Z kib $
   34  *
   35  *              originally from: locore.s, by William F. Jolitz
   36  *
   37  *              Substantially rewritten by David Greenman, Rod Grimes,
   38  *                      Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
   39  *                      and many others.
   40  */
   41 
   42 #include "opt_compat.h"
   43 
   44 #include <sys/syscall.h>
   45 #include <machine/asmacros.h>
   46 #include <machine/psl.h>
   47 
   48 #include "assym.s"
   49 
   50 /*
   51  * Signal trampoline, copied to top of user stack
   52  */
   53 NON_GPROF_ENTRY(sigcode)
   54         calll   *SIGF_HANDLER(%esp)
   55         leal    SIGF_UC(%esp),%eax      /* get ucontext */
   56         pushl   %eax
   57         testl   $PSL_VM,UC_EFLAGS(%eax)
   58         jne     1f
   59         mov     UC_GS(%eax),%gs         /* restore %gs */
   60 1:
   61         movl    $SYS_sigreturn,%eax
   62         pushl   %eax                    /* junk to fake return addr. */
   63         int     $0x80                   /* enter kernel with args */
   64                                         /* on stack */
   65 1:
   66         jmp     1b
   67 
   68 #ifdef COMPAT_FREEBSD4
   69         ALIGN_TEXT
   70 freebsd4_sigcode:
   71         calll   *SIGF_HANDLER(%esp)
   72         leal    SIGF_UC4(%esp),%eax     /* get ucontext */
   73         pushl   %eax
   74         testl   $PSL_VM,UC4_EFLAGS(%eax)
   75         jne     1f
   76         mov     UC4_GS(%eax),%gs        /* restore %gs */
   77 1:
   78         movl    $344,%eax               /* 4.x SYS_sigreturn */
   79         pushl   %eax                    /* junk to fake return addr. */
   80         int     $0x80                   /* enter kernel with args */
   81                                         /* on stack */
   82 1:
   83         jmp     1b
   84 #endif
   85 
   86 #ifdef COMPAT_43
   87         ALIGN_TEXT
   88 osigcode:
   89         call    *SIGF_HANDLER(%esp)     /* call signal handler */
   90         lea     SIGF_SC(%esp),%eax      /* get sigcontext */
   91         pushl   %eax
   92         testl   $PSL_VM,SC_PS(%eax)
   93         jne     9f
   94         mov     SC_GS(%eax),%gs         /* restore %gs */
   95 9:
   96         movl    $103,%eax               /* 3.x SYS_sigreturn */
   97         pushl   %eax                    /* junk to fake return addr. */
   98         int     $0x80                   /* enter kernel with args */
   99 0:      jmp     0b
  100 #endif /* COMPAT_43 */
  101 
  102         ALIGN_TEXT
  103 esigcode:
  104 
  105         .data
  106         .globl  szsigcode
  107 szsigcode:
  108         .long   esigcode-sigcode
  109 #ifdef COMPAT_FREEBSD4
  110         .globl  szfreebsd4_sigcode
  111 szfreebsd4_sigcode:
  112         .long   esigcode-freebsd4_sigcode
  113 #endif
  114 #ifdef COMPAT_43
  115         .globl  szosigcode
  116 szosigcode:
  117         .long   esigcode-osigcode
  118 #endif

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