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/* $OpenBSD: md_init.h,v 1.11 2020/10/15 16:30:23 deraadt Exp $ */
/*-
* Copyright (c) 2001 Ross Harvey
* All rights reserved.
*
* 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 by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
#define MD_SECT_CALL_FUNC(section, func) \
__asm (".section "#section", \"ax\"\n" \
" call " #func "\n" \
" .previous")
/*
* Align is after because we want the function to start at the first
* address of the section, but overall we want the section to be
* aligned by the align amount.
*/
#define MD_SECTION_PROLOGUE(sect, entry_pt) \
__asm ( \
".section "#sect",\"ax\",@progbits \n" \
" .globl " #entry_pt " \n" \
" .type " #entry_pt ",@function \n" \
#entry_pt": \n" \
" .align 16 \n" \
" pushl %ebp \n" \
" movl %esp,%ebp \n" \
" andl $~15,%esp \n" \
" .previous")
#define MD_SECTION_EPILOGUE(sect) \
__asm ( \
".section "#sect",\"ax\",@progbits \n" \
" leave \n" \
" ret \n" \
" .previous")
#define MD_CRT0_START \
__asm( \
".text \n" \
" .align 4 \n" \
" .globl __start \n" \
" .globl _start \n" \
"_start: \n" \
"__start: \n" \
" movl %esp,%ebp \n" \
" andl $~15,%esp # align stack\n" \
" pushl %edx # cleanup\n" \
" movl 0(%ebp),%eax \n" \
" leal 8(%ebp,%eax,4),%ecx \n" \
" leal 4(%ebp),%edx \n" \
" pushl %ecx \n" \
" pushl %edx \n" \
" pushl %eax \n" \
" xorl %ebp,%ebp # mark deepest stack frame\n" \
" call ___start \n" \
" .previous")
#define MD_RCRT0_START \
__asm( \
".text \n" \
" .align 4 \n" \
" .globl __start \n" \
" .globl _start \n" \
"_start: \n" \
"__start: \n" \
" movl %esp,%eax # save SP for dl_boot_bind \n" \
" subl $16*4,%esp # allocate dl_data \n" \
" call 1f # push &_DYNAMIC... \n" \
"1: addl $(_DYNAMIC-1b),(%esp) # ...for dl_boot_bind \n" \
" movl %esp,%ebx \n" \
" pushl %ebx # push dl_data for dl_boot_bind \n" \
" \n" \
" mov %eax, %esi # save stack for ___start \n" \
" pushl %eax # push saved SP for dl_boot_bind \n" \
" \n" \
" call _dl_boot_bind@PLT # _dl_boot_bind(sp,dl_data,0) \n" \
" addl $3*4,%esp # pop args \n" \
" \n" \
" movl %esi,%ebp \n" \
" andl $~15,%esp # align stack\n" \
" pushl $0 # cleanup\n" \
" movl 0(%ebp),%eax # argc \n" \
" leal 8(%ebp,%eax,4),%ecx #envp \n" \
" leal 4(%ebp),%edx # argv \n" \
" pushl %ecx \n" \
" pushl %edx \n" \
" pushl %eax \n" \
" xorl %ebp,%ebp # mark deepest stack frame\n" \
" call ___start # ___start(argc,argv,envp,0) \n" \
" \n" \
" .align 4 \n" \
" .globl _dl_exit \n" \
" .type _dl_exit,@function \n" \
"_dl_exit: \n" \
" mov $" STR(SYS_exit) ", %eax\n" \
" int $0x80 \n" \
" int3 \n" \
" .previous")
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