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/* $NetBSD: rtld_start.S,v 1.9 2002/10/05 11:59:05 mycroft Exp $ */
/* $FreeBSD$ */
/*
* Copyright 1997 Michael L. Hitch <mhitch@montana.edu>
* Portions copyright 2002 Charles M. Hannum <root@ihack.net>
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without 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.
*/
#include <machine/asm.h>
.globl _C_LABEL(_rtld_relocate_nonplt_self)
.globl _C_LABEL(_rtld)
LEAF(rtld_start)
.abicalls
.set noreorder
.cpload t9
addu sp, sp, -16 /* adjust stack pointer */
/* keep it aligned */
.cprestore 0 /* -> 0(sp) for gp */
/* -> 4(sp) for atexit */
/* -> 8(sp) for obj_main */
move s0,a0 /* save stack pointer from a0 */
move s1,a3 /* save ps_strings pointer */
la a1, 1f
bal 1f
nop
1: subu a1, ra, a1 /* relocbase */
la t9,_C_LABEL(_rtld_relocate_nonplt_self)
move s2,a1
la a0,_DYNAMIC
addu t9, a1, t9
jalr t9
addu a0, a1, a0 /* &_DYNAMIC */
move a0, s0 /* stack pointer */
addu a1, sp, 4 /* &exit_proc */
addu a2, sp, 8 /* &objp */
addu sp, sp, -16 /* arguments slot */
jal _C_LABEL(_rtld) /* v0 = _rtld(sp, exit_proc, objp) */
nop
addu sp, sp, 16
move a0, s0 /* arguments pointer */
move a3, s1 /* arguments pointer */
lw a1, 4(sp) /* our atexit function */
lw a2, 8(sp) /* obj_main entry */
addu sp, sp, 16 /* readjust stack */
move t9,v0
move a2,s1 /* restore ps_strings */
jr t9 /* _start(ap, cleanup, obj, ps_strings); */
nop
END(rtld_start)
.globl _rtld_bind_start
.ent _rtld_bind_start
_rtld_bind_start:
/* ABI conventions for stubs:
* t8 contains symbol index
* t7 contains return address
*/
.frame sp, 0, ra /* satisfy compiler */
move v1,gp /* save old GP */
add t9,8 /* modify T9 to point at .cpload */
.cpload t9
subu sp,48 /* save arguments and sp value */
.cprestore 36
sw a0,16(sp)
sw a1,20(sp)
sw a2,24(sp)
sw a3,28(sp)
sw s0,32(sp)
sw t7,40(sp)
move s0,sp
move a0,v1 /* old GP */
subu a0,a0,0x7ff0 /* The offset of $gp from the */
/* beginning of the .got section: */
/* $gp = .got + 0x7ff0, so */
/* .got = $gp - 0x7ff0 */
/* Simple math as you can see. */
lw a0,4(a0) /* object = pltgot[1] & 0x7fffffff */
and a0,a0,0x7fffffff
move a1,t8 /* symbol index */
jal _C_LABEL(_mips_rtld_bind)
nop
move sp,s0
lw ra,40(sp)
lw a0,16(sp)
lw a1,20(sp)
lw a2,24(sp)
lw a3,28(sp)
lw s0,32(sp)
addu sp,48
move t9,v0
jr t9
nop
.end _rtld_bind_start
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