/*      $NetBSD: rtld_start.S,v 1.16 2008/04/28 20:23:03 martin Exp $   */

/*-
 * Copyright (c) 1999, 2002, 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas, Paul Kranenburg, and by Charles M. Hannum.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <machine/asm.h>

        .section        ".text"
        .align  4
        .global _rtld_start
        .type   _rtld_start,@function
_rtld_start:
        mov     0, %fp                  /* Erect a fence post for ourselves */
        mov     %g1, %l1                /* save ps_strings */
        sub     %sp, 32+8, %sp          /* room for return args and save area */

        sethi   %hi(_GLOBAL_OFFSET_TABLE_-4), %l7
        call    0f
         add    %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7
        call    _DYNAMIC+8
0:      add     %l7, %o7, %l7           /* real &_GLOBAL_OFFSET_TABLE_ */
        ld      [%o7+8], %o0            /* load stub call instruction */
        ld      [%l7], %l0              /* base-relative &_DYNAMIC */
        sll     %o0, 2, %o0             /* extract PC offset */

        add     %o0, %o7, %o0           /* real &_DYNAMIC */
        sub     %o0, %l0, %l0           /* relocbase */
        call    _rtld_relocate_nonplt_self
         mov    %l0, %o1                /* relocbase */

        mov     %l0, %o1                /* relocbase */
        call    _rtld
         add    %sp, 96, %o0            /* &argc - 8 */

        ld      [%sp + 96], %g3 /* arg: cleanup */
        ld      [%sp + 96 + 4], %g2     /* arg: obj */
        add     %sp, 32+8, %sp          /* restore stack pointer */

        jmp     %o0
         mov    %l1, %g1                /* restore ps_strings */


        .section        ".text"
        .align  4
        .global _rtld_bind_start
        .type   _rtld_bind_start,@function
_rtld_bind_start:       # (obj, reloff)
        ld      [%o7 + 8], %o0          /* obj id is in second PLT slot */
        srl     %g1, 10, %o1            /* offset is in high 22 bits */
        call    _rtld_bind              /* Call _rtld_bind(obj, offset) */
         sub    %o1, 12*4, %o1          /* first 4 `pltrel' entries missing! */

        jmp     %o0                     /* return value == function address */
         restore