1 /* $OpenBSD: md_init.h,v 1.11 2020/10/15 16:30:23 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 Ross Harvey 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #define MD_SECT_CALL_FUNC(section, func) \ 37 __asm (".section "#section", \"ax\"\n" \ 38 " call " #func "\n" \ 39 " .previous") 40 41 /* 42 * Align is after because we want the function to start at the first 43 * address of the section, but overall we want the section to be 44 * aligned by the align amount. 45 */ 46 #define MD_SECTION_PROLOGUE(sect, entry_pt) \ 47 __asm ( \ 48 ".section "#sect",\"ax\",@progbits \n" \ 49 " .globl " #entry_pt " \n" \ 50 " .type " #entry_pt ",@function \n" \ 51 #entry_pt": \n" \ 52 " .align 16 \n" \ 53 " pushl %ebp \n" \ 54 " movl %esp,%ebp \n" \ 55 " andl $~15,%esp \n" \ 56 " .previous") 57 58 59 #define MD_SECTION_EPILOGUE(sect) \ 60 __asm ( \ 61 ".section "#sect",\"ax\",@progbits \n" \ 62 " leave \n" \ 63 " ret \n" \ 64 " .previous") 65 66 67 #define MD_CRT0_START \ 68 __asm( \ 69 ".text \n" \ 70 " .align 4 \n" \ 71 " .globl __start \n" \ 72 " .globl _start \n" \ 73 "_start: \n" \ 74 "__start: \n" \ 75 " movl %esp,%ebp \n" \ 76 " andl $~15,%esp # align stack\n" \ 77 " pushl %edx # cleanup\n" \ 78 " movl 0(%ebp),%eax \n" \ 79 " leal 8(%ebp,%eax,4),%ecx \n" \ 80 " leal 4(%ebp),%edx \n" \ 81 " pushl %ecx \n" \ 82 " pushl %edx \n" \ 83 " pushl %eax \n" \ 84 " xorl %ebp,%ebp # mark deepest stack frame\n" \ 85 " call ___start \n" \ 86 " .previous") 87 88 #define MD_RCRT0_START \ 89 __asm( \ 90 ".text \n" \ 91 " .align 4 \n" \ 92 " .globl __start \n" \ 93 " .globl _start \n" \ 94 "_start: \n" \ 95 "__start: \n" \ 96 " movl %esp,%eax # save SP for dl_boot_bind \n" \ 97 " subl $16*4,%esp # allocate dl_data \n" \ 98 " call 1f # push &_DYNAMIC... \n" \ 99 "1: addl $(_DYNAMIC-1b),(%esp) # ...for dl_boot_bind \n" \ 100 " movl %esp,%ebx \n" \ 101 " pushl %ebx # push dl_data for dl_boot_bind \n" \ 102 " \n" \ 103 " mov %eax, %esi # save stack for ___start \n" \ 104 " pushl %eax # push saved SP for dl_boot_bind \n" \ 105 " \n" \ 106 " call _dl_boot_bind@PLT # _dl_boot_bind(sp,dl_data,0) \n" \ 107 " addl $3*4,%esp # pop args \n" \ 108 " \n" \ 109 " movl %esi,%ebp \n" \ 110 " andl $~15,%esp # align stack\n" \ 111 " pushl $0 # cleanup\n" \ 112 " movl 0(%ebp),%eax # argc \n" \ 113 " leal 8(%ebp,%eax,4),%ecx #envp \n" \ 114 " leal 4(%ebp),%edx # argv \n" \ 115 " pushl %ecx \n" \ 116 " pushl %edx \n" \ 117 " pushl %eax \n" \ 118 " xorl %ebp,%ebp # mark deepest stack frame\n" \ 119 " call ___start # ___start(argc,argv,envp,0) \n" \ 120 " \n" \ 121 " .align 4 \n" \ 122 " .globl _dl_exit \n" \ 123 " .type _dl_exit,@function \n" \ 124 "_dl_exit: \n" \ 125 " mov $" STR(SYS_exit) ", %eax\n" \ 126 " int $0x80 \n" \ 127 " int3 \n" \ 128 " .previous") 129