_setjmp.s

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        _setjmp.s,v $
   29  * Revision 2.5  93/02/04  07:55:31  danner
   30  *      Convert asm comment "/" over to "/ *" "* /"
   31  *      [93/01/27            rvb]
   32  * 
   33  * Revision 2.4  91/05/14  16:02:32  mrt
   34  *      Correcting copyright
   35  * 
   36  * Revision 2.3  91/02/05  17:10:37  mrt
   37  *      Changed to new Mach copyright
   38  *      [91/02/01  17:30:23  mrt]
   39  * 
   40  * Revision 2.2  90/05/03  15:21:17  dbg
   41  *      First checkin.
   42  * 
   43  * Revision 1.3  89/11/30  19:52:47  kupfer
   44  * Changes for Tahoe and a.out.
   45  * 
   46  * Revision 1.2  89/11/16  21:22:02  kupfer
   47  * longjmp should reset the floating point coprocessor.
   48  */
   49 
   50 /*
   51  * C library -- _setjmp, _longjmp
   52  *
   53  *      _longjmp(a,v)
   54  * will generate a "return(v)" from
   55  * the last call to
   56  *      _setjmp(a)
   57  * by restoring registers from the stack,
   58  * The previous signal state is NOT restored.
   59  *
   60  */
   61 
   62 #include <i386/asm.h>
   63 
   64 ENTRY(_setjmp)
   65         movl    4(%esp),%ecx            /* fetch buffer */
   66         movl    %ebx,0(%ecx)
   67         movl    %esi,4(%ecx)
   68         movl    %edi,8(%ecx)
   69         movl    %ebp,12(%ecx)           /* save frame pointer of caller */
   70         popl    %edx
   71         movl    %esp,16(%ecx)           /* save stack pointer of caller */
   72         movl    %edx,20(%ecx)           /* save pc of caller */
   73         xorl    %eax,%eax
   74         jmp     *%edx
   75 
   76 ENTRY(_longjmp)
   77         movl    8(%esp),%eax            /* return(v) */
   78         movl    4(%esp),%ecx            /* fetch buffer */
   79         movl    0(%ecx),%ebx
   80         movl    4(%ecx),%esi
   81         movl    8(%ecx),%edi
   82         movl    12(%ecx),%ebp
   83         movl    16(%ecx),%esp
   84         orl     %eax,%eax
   85         jnz     0f
   86         incl    %eax
   87 0:      jmp     *20(%ecx)               /* done, return.... */

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FreeBSD/Linux Kernel Cross Reference sys/i386/_setjmp.s

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sys/i386/_setjmp.s