/* $OpenBSD: md_init.h,v 1.13 2023/11/18 16:26:16 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")

#define MD_SECTION_PROLOGUE(sect, entry_pt)     \
        __asm (                                 \
        ".section "#sect",\"ax\",@progbits      \n" \
        "       .globl " #entry_pt "            \n" \
        "       .type " #entry_pt ",@function   \n" \
        "       .align 16                       \n" \
        #entry_pt":                             \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  _csu_abort              \n" \
        "       .type   _csu_abort,@function    \n" \
        "_csu_abort:                            \n" \
        "       int3                            \n" \
        "       .previous")