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Annotation of sys/lib/libkern/arch/sparc64/_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 1.1.1.1 1998/06/20 05:18:14 eeh 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 "$NetBSD: _setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh 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:        btst    1, %sp
                     61:        bne,a,pt %xcc, 1f       ! 32 or 64-bit stack?
                     62:         std    %sp, [%o0+0]    ! 32-bit stack pointer & return pc
                     63:
                     64:        stx     %sp, [%o0+0]    ! 64-bit stack pointer
                     65:        stx     %o7, [%o0+8]    ! 64-bit return pc
                     66:        stx     %fp, [%o0+16]   ! 64-bit frame pointer
                     67:        retl
                     68:         clr    %o0
                     69: 1:
                     70:        st      %fp, [%o0+8]    ! 32-bit frame pointer
                     71:        retl
                     72:         clr    %o0
                     73:
                     74: ENTRY(_longjmp)
                     75:        set     1, %g6
                     76:        btst    1, %fp          ! 32 or 64-bit stack?
                     77:        movrz   %o1, %o1, %g6   ! compute v ? v : 1 in a global register
                     78:        bne,pt  %xcc, 2f        ! 64-bit
                     79:         mov    %o0, %g1        ! save a in another global register
                     80:        ld      [%g1+8], %g7    /* get caller's frame */
                     81:
                     82: 1:
                     83:        cmp     %fp, %g7        ! compare against desired frame
                     84:        bl,a    1b              ! if below,
                     85:         restore                !    pop frame and loop
                     86:        bne,pn  %icc, Llongjmpbotch             ! if there,
                     87:         ldd    [%g1+0], %o2    !    fetch return %sp and pc, and get out
                     88:        ba,a,pt %icc, 4f
                     89: 2:
                     90:        ldx     [%g1+16], %g7   /* get caller's frame */
                     91:
                     92: 3:
                     93:        cmp     %fp, %g7        ! compare against desired frame
                     94:        bl,a,pt %xcc, 3b        ! if below,
                     95:         restore                !    pop frame and loop
                     96:        bne,pn  %xcc, Llongjmpbotch     ! if there,
                     97:         ldx    [%g1+0], %o2    !    fetch return %sp and pc, and get out
                     98:        ldx     [%g1+8], %o3
                     99: 4:
                    100:        cmp     %o2, %sp        ! %sp must not decrease
                    101:        blt,pn  %icc, Llongjmpbotch
                    102:         movge  %icc, %o2, %sp  ! it is OK, put it in place
                    103:        jmp     %o3 + 8         ! success, return %g6
                    104:         mov    %g6, %o0
                    105:
                    106: Lbotch:
                    107:        call    _longjmperror   ! otherwise, went too far; bomb out
                    108:        nop
                    109:        unimp   0
                    110:                                ! otherwise, went too far; bomb out
                    111:
                    112:
                    113:
                    114: