1 /* $OpenBSD: md_init.h,v 1.8 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 " subq $8,%rsp \n" \ 54 " .previous") 55 56 57 #define MD_SECTION_EPILOGUE(sect) \ 58 __asm ( \ 59 ".section "#sect",\"ax\",@progbits \n" \ 60 " addq $8,%rsp \n" \ 61 " ret \n" \ 62 " .previous") 63 64 65 #define MD_CRT0_START \ 66 __asm( \ 67 ".text \n" \ 68 " .align 8 \n" \ 69 " .globl __start \n" \ 70 " .globl _start \n" \ 71 "_start: \n" \ 72 "__start: \n" \ 73 " movq %rdx,%rcx \n" \ 74 " movq (%rsp),%rdi \n" \ 75 " leaq 16(%rsp,%rdi,8),%rdx \n" \ 76 " leaq 8(%rsp),%rsi \n" \ 77 " subq $8,%rsp \n" \ 78 " andq $~15,%rsp \n" \ 79 " addq $8,%rsp \n" \ 80 " jmp ___start \n" \ 81 " .previous") 82 83 #define MD_RCRT0_START \ 84 __asm( \ 85 ".text \n" \ 86 " .align 8 \n" \ 87 " .globl __start \n" \ 88 " .type __start,@function \n" \ 89 "_start: \n" \ 90 "__start: \n" \ 91 " movq %rsp, %r12 \n" \ 92 " subq $8, %rsp \n" \ 93 " andq $~15, %rsp \n" \ 94 " addq $8, %rsp \n" \ 95 " pushq %rbx \n" \ 96 " subq $(16*8), %rsp \n" \ 97 " leaq _DYNAMIC(%rip),%rdx \n" \ 98 " movq %rsp, %rsi \n" \ 99 " movq %r12, %rdi \n" \ 100 " call _dl_boot_bind@PLT \n" \ 101 " \n" \ 102 " movq $0, %rcx \n" \ 103 " movq %r12, %rsp \n" \ 104 " movq (%rsp),%rdi \n" \ 105 " leaq 16(%rsp,%rdi,8),%rdx \n" \ 106 " leaq 8(%rsp),%rsi \n" \ 107 " subq $8,%rsp \n" \ 108 " andq $~15,%rsp \n" \ 109 " addq $8,%rsp \n" \ 110 " jmp ___start \n" \ 111 " \n" \ 112 " .global _dl_exit \n" \ 113 " .type _dl_exit,@function \n" \ 114 " .align 8 \n" \ 115 "_dl_exit: \n" \ 116 " movl $ " STR(SYS_exit) ", %eax \n" \ 117 " syscall \n" \ 118 " int3 \n" \ 119 " .previous") 120