e83f7ba2c9
. file- and functionality-compatible with previous situation
(FreeBSD csu) (with a crt1.o -> crt0.o symlink in /usr/lib)
. harmonizes source with netbsd
. harmonizes linker invocation (e.g. clang) with netbsd
. helpful to get some arm code in there for the arm port project
82 lines
2.9 KiB
ArmAsm
82 lines
2.9 KiB
ArmAsm
/* $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
|
|
|