minix/libexec/ld.elf_so/arch/x86_64/rtld_start.S

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