gnu/usr.bin/ld/sparc/mdprologue.S

/*
 * Copyright (c) 1993 Paul Kranenburg
 * All rights reserved.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Paul Kranenburg.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software withough specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 *      $Id: mdprologue.S,v 1.1 1993/10/16 21:54:36 pk Exp $
 */

/*
 * SPARC run-time link editor entry points.
 */

#define CRT_VERSION_SUN         1

        .seg    "text"                  ! [internal]
        .proc   16
        .global _rtld_entry
_rtld_entry:
!#PROLOGUE# 0
        save    %sp,-96,%sp
L.1B:
        call    L.2B
        sethi   %hi((__GLOBAL_OFFSET_TABLE_-(L.1B-.))),%l7
L.2B:
!#PROLOGUE# 1
        or      %l7,%lo((__GLOBAL_OFFSET_TABLE_-(L.1B-.))),%l7
        add     %l7,%o7,%l7

        cmp     %i0, CRT_VERSION_SUN    ! is crtp passed in Sun style,
        bne     1f                      !  ie. relative to stack frame ?
        nop
        add     %i1, %fp, %i1           ! if so, adjust to absolute address
1:
        ld      [%i1], %o3              ! load base address (crtp->crt_ba)
        ld      [%l7], %o2              ! get rtld's __DYNAMIC address
                                        !   from 1st GOT entry
        add     %o2, %o3, %o2           ! relocate and make it 3rd arg.

        ld      [%l7 + _rtld], %g1      ! get address of rtld()
        add     %g1, %o3, %g1           ! relocate

        mov     %i1, %o1                ! set up args, #2: crtp
        call    %g1                     ! rtld(version, crtp, dp)
        mov     %i0, %o0                ! arg #1: version

        ret
        restore
        .seg    "data"                  ! [internal]

        .seg    "text"
        .global _binder_entry
_binder_entry:
!#PROLOGUE# 0
        save    %sp,-96,%sp
!L.1C:
!       call    L.2C
!       sethi   %hi((__GLOBAL_OFFSET_TABLE_-(L.1C-.))),%l7
!L.2C:
!       or      %l7,%lo((__GLOBAL_OFFSET_TABLE_-(L.1C-.))),%l7
!#PROLOGUE# 1

        sub     %i7, 4, %o0             ! get to jmpslot through pc
        ld      [%i7+4], %o1            ! get relocation index
        sethi   %hi(0x3fffff), %o2      ! -> reloc_index & 0x003fffff
        or      %o2, %lo(0x3fffff), %o2 ! [internal]
        call    _binder                 ! and call binder(jsp, reloc_index)
        and     %o1, %o2, %o1

        mov     %o0, %g1                ! return value == function address

        restore                         ! get rid of our context
        jmp     %g1                     ! and go.
        restore                         ! and the jmpslot's
        nop

        .seg    "data"                  ! [internal]