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
117 lines
3.4 KiB
ArmAsm
117 lines
3.4 KiB
ArmAsm
/* $NetBSD: rtld_start.S,v 1.7 2008/04/28 20:23:03 martin Exp $ */
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/*-
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* Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Marcus Comstedt.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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.text
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.align 2
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.globl .rtld_start
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.type .rtld_start,@function
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.rtld_start:
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mova 2f,r0
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mov.l @r0,r2
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add r0,r2 /* GOT */
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mov.l @(4,r0),r4 /* _DYNAMIC@GOTOFF */
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add r2,r4 /* _DYNAMIC */
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mov.l @(12,r0),r1 /* _rtld_relocate_nonplt_self offset */
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mov.l @(8,r0),r0 /* _DYNAMIC@GOT */
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mov r4,r5
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mov.l @(r0,r2),r0 /* where linker thinks _DYNAMIC is */
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sub r0,r5 /* compute relocation base */
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bsrf r1 /* _rtld_relocate_nonplt_self(dynp, relocbase) */
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mov.l r5,@-r15 /* save relocbase */
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4:
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mov.l @r15+,r5 /* restore relocbase */
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add #-8,r15 /* room for values returned by _rtld */
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mov r15,r4
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mov.l 1f,r0
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bsrf r0 /* _rtld(sp, relocbase) */
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mov.l r9,@-r15 /* save ps_strings */
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3:
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mov.l @r15+,r9 /* restore ps_strings */
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mov.l @r15+,r7 /* from _rtld: exit procedure */
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mov.l @r15+,r8 /* from _rtld: main object */
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mov.l @r15,r4 /* restore argc */
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mov r15,r5 /* restore argv */
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add #4,r5
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mov r4,r6 /* restore envp */
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shll2 r6
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add r15,r6
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jmp @r0 /* entry point returned by _rtld */
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add #8,r6
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.align 2
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1: .long _rtld-3b
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2: .long _GLOBAL_OFFSET_TABLE_
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.long _DYNAMIC@GOTOFF
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.long _DYNAMIC@GOT
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.long _rtld_relocate_nonplt_self-4b
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.size .rtld_start,.-.rtld_start
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.align 2
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.globl _rtld_bind_start
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.type _rtld_bind_start,@function
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_rtld_bind_start: /* r0 = obj, r1 = reloff */
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mov.l r2,@-r15 /* save registers */
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mov.l r3,@-r15
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mov.l r4,@-r15
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mov.l r5,@-r15
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mov.l r6,@-r15
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mov.l r7,@-r15
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sts.l mach,@-r15
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sts.l macl,@-r15
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sts.l pr,@-r15
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mov r0,r4 /* copy of obj */
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mov.l 2f,r0
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bsrf r0 /* call the binder */
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mov r1,r5 /* copy of reloff */
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4:
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lds.l @r15+,pr /* restore registers */
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lds.l @r15+,macl
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lds.l @r15+,mach
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mov.l @r15+,r7
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mov.l @r15+,r6
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mov.l @r15+,r5
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mov.l @r15+,r4
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mov.l @r15+,r3
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jmp @r0
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mov.l @r15+,r2
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.align 2
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2: .long _rtld_bind-4b
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.size _rtld_bind_start,.-_rtld_bind_start
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.end
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