1 /* $OpenBSD: md_init.h,v 1.10 2020/10/19 17:57:40 naddy 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 " bl " #func " \n" \ 39 " .previous") 40 41 #define MD_SECTION_PROLOGUE(sect, entry_pt) \ 42 __asm ( \ 43 ".section "#sect",\"ax\",%progbits \n" \ 44 " .globl " #entry_pt " \n" \ 45 " .type " #entry_pt ",%function \n" \ 46 " .align 4 \n" \ 47 #entry_pt": \n" \ 48 " sub sp, sp, #16 \n" \ 49 " str lr, [sp] \n" \ 50 " /* fall thru */ \n" \ 51 " .previous") 52 53 54 #define MD_SECTION_EPILOGUE(sect) \ 55 __asm ( \ 56 ".section "#sect",\"ax\",%progbits \n" \ 57 " ldr lr, [sp] \n" \ 58 " add sp, sp, #16 \n" \ 59 " ret \n" \ 60 " .previous") 61 62 63 #define MD_CRT0_START \ 64 __asm( \ 65 ".text \n" \ 66 " .align 0 \n" \ 67 " .globl _start \n" \ 68 " .globl __start \n" \ 69 "_start: \n" \ 70 "__start: \n" \ 71 " mov x3, x2 /* cleanup */ \n" \ 72 "/* Get argc/argv/envp from stack */ \n" \ 73 " ldr x0, [sp] \n" \ 74 " add x1, sp, #0x0008 \n" \ 75 " add x2, x1, x0, lsl #3 \n" \ 76 " add x2, x2, #0x0008 \n" \ 77 " \n" \ 78 " b ___start \n" \ 79 ".previous"); 80 81 #define MD_RCRT0_START \ 82 char **environ, *__progname; \ 83 __asm( \ 84 ".text \n" \ 85 " .align 0 \n" \ 86 " .globl _start \n" \ 87 " .globl __start \n" \ 88 "_start: \n" \ 89 "__start: \n" \ 90 " mov fp, sp \n" \ 91 " mov x0, fp \n" \ 92 " \n" \ 93 " sub sp, sp, #8+8+(16*8) \n" \ 94 " add x1, sp, #4 \n" \ 95 " \n" \ 96 " adrp x2, _DYNAMIC \n" \ 97 " add x2, x2, #:lo12:_DYNAMIC \n" \ 98 " \n" \ 99 " bl _dl_boot_bind \n" \ 100 " \n" \ 101 " mov sp, fp \n" \ 102 " mov fp, #0 \n" \ 103 " \n" \ 104 " mov x3, #0 /* cleanup */ \n" \ 105 "/* Get argc/argv/envp from stack */ \n" \ 106 " ldr x0, [sp] \n" \ 107 " add x1, sp, #0x0008 \n" \ 108 " add x2, x1, x0, lsl #3 \n" \ 109 " add x2, x2, #0x0008 \n" \ 110 " \n" \ 111 " b ___start \n" \ 112 " \n" \ 113 "_dl_exit: \n" \ 114 " mov x8, #" STR(SYS_exit) " \n" \ 115 " svc #0 \n" \ 116 " dsb nsh \n" \ 117 " isb \n" \ 118 " udf #0 \n" \ 119 ".previous"); 120