2012-11-15 12:06:41 +01:00
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/* $NetBSD: rtld_start.S,v 1.9 2011/12/11 22:07:26 joerg Exp $ */
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2012-03-31 00:35:32 +02:00
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, Inc.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* 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 WASABI SYSTEMS, INC
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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 16
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.globl .rtld_start
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.hidden .rtld_start
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.type .rtld_start,@function
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.rtld_start:
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subq $16,%rsp # make room of obj_main and exit proc
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movq %rsp,%r12 # stack pointer arg to _rtld
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pushq %rbx # save ps_strings
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2012-11-15 12:06:41 +01:00
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andq $~15,%rsp # align rsp, to be restored from r12
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2012-03-31 00:35:32 +02:00
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leaq _GLOBAL_OFFSET_TABLE_(%rip),%rax
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leaq _DYNAMIC(%rip),%rdi # &_DYNAMIC
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movq %rdi,%rbx
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subq (%rax),%rbx # relocbase
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movq %rbx,%rsi
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call _rtld_relocate_nonplt_self
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movq %r12,%rdi
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movq %rbx,%rsi
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call _rtld # _rtld(sp, relocbase)
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2012-11-15 12:06:41 +01:00
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leaq -8(%r12),%rsp # restore saved rsp, including %rbx
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2012-03-31 00:35:32 +02:00
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popq %rbx # %rbx = ps_strings
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popq %rdx # %rdx = cleanup
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popq %rcx # %rcx = obj_main
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jmp *%rax
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.align 4
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.globl _rtld_bind_start
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.hidden _rtld_bind_start
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.type _rtld_bind_start,@function
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_rtld_bind_start: # (obj, reloff)
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# This function is called with a misaligned stack from the PLT
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# due to the additional argument pushed.
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# At this point %rsp % 16 == 8.
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pushfq # save caller-saved registers
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pushq %rax
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pushq %rcx
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pushq %rdx
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pushq %rsi
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pushq %rdi
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pushq %r8
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pushq %r9
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pushq %r10
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pushq %r11
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movq 80(%rsp),%rdi
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movq 88(%rsp),%rsi
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call _rtld_bind # call the binder
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movq %rax,88(%rsp) # store function in obj
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popq %r11
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popq %r10
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popq %r9
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popq %r8
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popq %rdi
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popq %rsi
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popq %rdx
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popq %rcx
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popq %rax
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popfq
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leaq 8(%rsp),%rsp
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ret
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