102 lines
3.4 KiB
ArmAsm
102 lines
3.4 KiB
ArmAsm
/* $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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* 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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
.text
|
|
.align 0
|
|
.globl .rtld_start
|
|
.type .rtld_start,%function
|
|
.rtld_start:
|
|
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
|
|
add r0, sp, #8
|
|
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 */
|
|
add sp, sp, #8 /* 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-r4,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 */
|
|
|
|
bl _rtld_bind /* Call the binder */
|
|
|
|
str r0, [r4] /* save address in GOT */
|
|
mov ip, r0 /* save new address */
|
|
|
|
ldmia sp!,{r0-r4,sl,fp,lr} /* restore the stack */
|
|
mov pc, ip /* jump to the new address */
|
|
|