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
79 lines
3.1 KiB
ArmAsm
79 lines
3.1 KiB
ArmAsm
/* $NetBSD: rtld_start.S,v 1.16 2003/03/02 22:03:40 mycroft Exp $ */
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/*
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* Copyright 1996 Matt Thomas <matt@3am-software.com>
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* Portions copyright 2002, 2003 Charles M. Hannum <root@ihack.net>
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* All rights reserved.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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/* R9 contains the address of PS_STRINGS and since its caller saved,
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* we can just use it. R6 has a backup copy of the stack pointer which
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* we can use as well.
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*/
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ENTRY(_rtld_start, 0)
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/* Allocate space on the stack for the cleanup and obj_main
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* entries that _rtld() will provide for us.
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*/
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clrl %fp
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subl2 $8,%sp
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movab _DYNAMIC,%r0
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subl3 _GLOBAL_OFFSET_TABLE_,%r0,%r10
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pushl %r10 /* relocbase */
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pushl %r0 /* &_DYNAMIC */
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calls $2,_rtld_relocate_nonplt_self
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pushl %r10 /* relocbase */
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pushal 4(%sp) /* sp */
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calls $2,_rtld /* entry = _rtld(sp, relocbase) */
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movq (%sp)+,%r7 /* grab cleanup and obj_main into %r7/%r8 */
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jmp 2(%r0) /* jump to entry point + 2 */
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/*
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* Lazy binding entry point, called via PLT.
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*
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* Note: Some functions rely on there not being an additional call frame;
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* hence the `optimization' to avoid the callg opportunistically.
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*/
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ALTENTRY(_rtld_bind_start)
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pushr $0x3f /* save R0-R5 */
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movq 24(%sp),%r0 /* get addresses of plt.got & reloc index */
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pushl (%r1) /* push relocation index */
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pushl %r0 /* push address of obj entry */
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calls $2,_rtld_bind
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movl %r0,28(%sp) /* save return address onto stack */
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bicw3 6(%fp),(%r0),%r0/* does the entry mask save any additional regs */
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popr $0x3f /* restore R0-R5 (cond flags not modified) */
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bneq 4f /* yes? do it the hard way */
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addl2 $4,%sp /* no? skip past plt.got on stack */
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addl2 $2,(%sp) /* skip past the mask */
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rsb /* and jump to it */
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4: addl2 $4,%sp
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callg (%ap),*(%sp)+ /* return value from _rtld_bind() == actual */
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ret
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