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Annotation of sys/lib/libkern/arch/sparc/_setjmp.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: _setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $     */
        !             2: /*     $NetBSD: _setjmp.S,v 1.2 1994/10/26 06:39:54 cgd Exp $  */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1992, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * This software was developed by the Computer Systems Engineering group
        !             9:  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
        !            10:  * contributed to Berkeley.
        !            11:  *
        !            12:  * Redistribution and use in source and binary forms, with or without
        !            13:  * modification, are permitted provided that the following conditions
        !            14:  * are met:
        !            15:  * 1. Redistributions of source code must retain the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer.
        !            17:  * 2. Redistributions in binary form must reproduce the above copyright
        !            18:  *    notice, this list of conditions and the following disclaimer in the
        !            19:  *    documentation and/or other materials provided with the distribution.
        !            20:  * 3. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  * Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp
        !            37:  */
        !            38:
        !            39: #if defined(LIBC_SCCS) && !defined(lint)
        !            40: #ifdef notdef
        !            41:        .asciz "@(#)_setjmp.s   8.1 (Berkeley) 6/4/93"
        !            42: #endif
        !            43:        .asciz "$OpenBSD: _setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $"
        !            44: #endif /* LIBC_SCCS and not lint */
        !            45:
        !            46: /*
        !            47:  * C library -- _setjmp, _longjmp
        !            48:  *
        !            49:  *     _longjmp(a,v)
        !            50:  * will generate a "return(v?v:1)" from
        !            51:  * the last call to
        !            52:  *     _setjmp(a)
        !            53:  * by unwinding the call stack.
        !            54:  * The previous signal state is NOT restored.
        !            55:  */
        !            56:
        !            57: #include "DEFS.h"
        !            58:
        !            59: ENTRY(_setjmp)
        !            60:        std     %sp, [%o0+0]    /* caller's stack pointer and return pc */
        !            61:        st      %fp, [%o0+8]    /* store caller's frame pointer */
        !            62:        retl
        !            63:         clr    %o0             ! return 0
        !            64:
        !            65: ENTRY(_longjmp)
        !            66:        addcc   %o1, %g0, %g6   ! compute v ? v : 1 in a global register
        !            67:        be,a    0f
        !            68:         mov    1, %g6
        !            69: 0:
        !            70:        mov     %o0, %g1        ! save a in another global register
        !            71:        ld      [%g1+8], %g7    /* get caller's frame */
        !            72: 1:
        !            73:        cmp     %fp, %g7        ! compare against desired frame
        !            74:        bl,a    1b              ! if below,
        !            75:         restore                !    pop frame and loop
        !            76:        be,a    2f              ! if there,
        !            77:         ldd    [%g1+0], %o2    !    fetch return %sp and pc, and get out
        !            78:
        !            79: Lbotch:
        !            80:        call    _longjmperror   ! otherwise, went too far; bomb out
        !            81:        nop
        !            82:        unimp   0
        !            83:
        !            84: 2:
        !            85:        cmp     %o2, %sp        ! %sp must not decrease
        !            86:        bge,a   3f
        !            87:         mov    %o2, %sp        ! it is OK, put it in place
        !            88:        b,a     Lbotch
        !            89: 3:
        !            90:        jmp     %o3 + 8         ! success, return %g6
        !            91:         mov    %g6, %o0