/*      $NetBSD: rtld_start.S,v 1.7 2002/09/12 17:18:38 mycroft Exp $   */

/*-
 * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas 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>
        .text
        .align  0
        .globl  .rtld_start
        .type   .rtld_start,%function
.rtld_start:
        mov     r6, sp                  /* save the stack pointer */
        bic     sp, sp, #7              /* align the stack pointer */
        sub     sp, sp, #8              /* make room for obj_main & exit proc */
        mov     r4, r0                  /* save ps_strings */
        ldr     sl, .L2
        ldr     r5, .L2+4
        ldr     r0, .L2+8
.L1:
        add     sl, pc, sl
        ldr     r5, [sl, r5]
        ldr     r0, [sl, r0]

        sub     r1, sl, r5              /* relocbase */
        add     r0, r1, r0              /* &_DYNAMIC */
        bl      _rtld_relocate_nonplt_self
        mov     r1, sp
        add     r2, sp, #4
        mov     r0, r6                  /* load the sp the kernel gave us */
        bl      _rtld                   /* call the shared loader */
        mov     r3, r0                  /* save entry point */

        ldr     r2, [sp, #0]            /* r2 = cleanup */
        ldr     r1, [sp, #4]            /* r1 = obj_main */
        mov     sp, r6                  /* restore stack */
        mov     r0, r4                  /* restore ps_strings */
        mov     pc, r3                  /* jump to the entry point */
.L2:
        .word   _GLOBAL_OFFSET_TABLE_ - (.L1+8)
        .word   _GLOBAL_OFFSET_TABLE_(GOT)
        .word   _DYNAMIC(GOT)

        .align  0
        .globl  _rtld_bind_start
        .type   _rtld_bind_start,%function
/*
 *      stack[0] = RA
 *      ip = &GOT[n+3]
 *      lr = &GOT[2]
 */
_rtld_bind_start:
        stmdb   sp!,{r0-r5,sl,fp}

        sub     r1, ip, lr              /* r1 = 4 * (n + 1) */
        sub     r1, r1, #4              /* r1 = 4 * n */
        add     r1, r1, r1              /* r1 = 8 * n */

        ldr     r0, [lr, #-4]           /* get obj ptr from GOT[1] */
        mov     r4, ip                  /* save GOT location */

        mov     r5, sp                  /* Save the stack pointer */
        bic     sp, sp, #7              /* Align the stack pointer */
        bl      _rtld_bind              /* Call the binder */
        mov     sp, r5                  /* Restore the old stack pointer */

        str     r0, [r4]                /* save address in GOT */
        mov     ip, r0                  /* save new address */

        ldmia   sp!,{r0-r5,sl,fp,lr}    /* restore the stack */
        mov     pc, ip                  /* jump to the new address */

        .section .note.GNU-stack,"",%progbits