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Annotation of sys/lib/libkern/arch/sparc/_setjmp.S, Revision 1.1.1.1

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