setjmp_i386.S

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or https://opensource.org/licenses/CDDL-1.0.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 
   22 /*
   23  * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
   24  */
   25 
   26 #define ENTRY(x) \
   27         .text; \
   28         .balign 8; \
   29         .globl  x; \
   30         .type   x, @function; \
   31 x:
   32 
   33 #define SET_SIZE(x) \
   34         .size   x, [.-x]
   35 
   36 /*
   37  * Setjmp and longjmp implement non-local gotos using state vectors
   38  * type label_t.
   39  */
   40 #ifdef __i386__
   41 
   42         ENTRY(setjmp)                   /* save area is passed in eax */
   43         movl    %ebp, 0(%eax)           /* save ebp */
   44         movl    %ebx, 4(%eax)           /* save ebx */
   45         movl    %esi, 8(%eax)           /* save esi */
   46         movl    %edi, 12(%eax)          /* save edi */
   47         movl    %esp, 16(%eax)          /* save esp */
   48         movl    (%esp), %ecx            /* %eip (return address) */
   49         movl    %ecx, 20(%eax)          /* save eip */
   50         subl    %eax, %eax              /* return 0 */
   51         ret
   52         SET_SIZE(setjmp)
   53 
   54         ENTRY(longjmp)                  /* save area is passed in eax */
   55         movl    0(%eax), %ebp           /* restore ebp */
   56         movl    4(%eax), %ebx           /* restore ebx */
   57         movl    8(%eax), %esi           /* restore esi */
   58         movl    12(%eax), %edi          /* restore edi */
   59         movl    16(%eax), %esp          /* restore esp */
   60         movl    20(%eax), %ecx          /* %eip (return address) */
   61         addl    $4, %esp                /* pop ret adr */
   62         jmp     *%ecx                   /* indirect jump */
   63         SET_SIZE(longjmp)
   64 
   65 #ifdef __ELF__
   66 .section .note.GNU-stack,"",%progbits
   67 #endif
   68 
   69 #endif /* __i386__ */

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/lua/setjmp/setjmp_i386.S

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/setjmp/setjmp_i386.S