1/* $OpenBSD: md_init.h,v 1.18 2023/11/18 16:26:16 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/* 37 * arm overrides these because it uses %progbits instead of @progbits 38 */ 39#define MD_DATA_SECTION_FLAGS_SYMBOL(section, flags, type, symbol) \ 40 extern __dso_hidden type symbol[]; \ 41 __asm(" .section "section",\""flags"\",%progbits \n" \ 42 " .balign 4 \n" \ 43 #symbol": \n" \ 44 " .previous") 45#define MD_DATA_SECTION_SYMBOL_VALUE(section, type, symbol, value) \ 46 extern __dso_hidden type symbol[]; \ 47 __asm(" .section "section",\"aw\",%progbits \n" \ 48 " .balign 4 \n" \ 49 #symbol": \n" \ 50 " .int "#value" \n" \ 51 " .previous") 52#define MD_DATA_SECTION_FLAGS_VALUE(section, flags, value) \ 53 __asm(" .section "section",\""flags"\",%progbits \n" \ 54 " .balign 4 \n" \ 55 " .int "#value" \n" \ 56 " .previous") 57 58#define MD_SECT_CALL_FUNC(section, func) \ 59 __asm (".section "#section", \"ax\" \n" \ 60 " movw r0, #:lower16:" #func "- 1f - 8 \n" \ 61 " movt r0, #:upper16:" #func "- 1f - 8 \n" \ 62 "1: add r0, r0, pc \n" \ 63 " blx r0 \n" \ 64 " .previous") 65 66#define MD_SECTION_PROLOGUE(sect, entry_pt) \ 67 __asm ( \ 68 ".section "#sect",\"ax\",%progbits \n" \ 69 " .globl " #entry_pt " \n" \ 70 " .type " #entry_pt ",%function \n" \ 71 " .align 4 \n" \ 72 #entry_pt": \n" \ 73 " push {r4, lr} \n" \ 74 " /* fall thru */ \n" \ 75 " .previous") 76 77 78#define MD_SECTION_EPILOGUE(sect) \ 79 __asm ( \ 80 ".section "#sect",\"ax\",%progbits \n" \ 81 " pop {r4, pc} \n" \ 82 " .previous") 83 84 85/* 86 * The definitions of environ and __progname prevent the creation 87 * of COPY relocations for WEAK symbols. 88 */ 89#define MD_CRT0_START \ 90 char **environ, *__progname; \ 91 __asm( \ 92 ".text \n" \ 93 " .align 0 \n" \ 94 " .globl _start \n" \ 95 " .globl __start \n" \ 96 "_start: \n" \ 97 "__start: \n" \ 98 " mov r3, r0 /* cleanup */ \n" \ 99 "/* Get argc/argv/envp from stack */ \n" \ 100 " ldr r0, [sp, #0] \n" \ 101 " add r1, sp, #4 \n" \ 102 " add r2, r1, r0, lsl #2 \n" \ 103 " add r2, r2, #4 \n" \ 104 " \n" \ 105 "/* \n" \ 106 " * Ensure the stack is properly \n" \ 107 " * aligned before calling C code. \n" \ 108 " */ \n" \ 109 " bic sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ " \n" \ 110 " b ___start \n" \ 111 ".previous"); 112 113#define MD_RCRT0_START \ 114 char **environ, *__progname; \ 115 __asm( \ 116 ".text \n" \ 117 " .align 0 \n" \ 118 " .globl _start \n" \ 119 " .globl __start \n" \ 120 "_start: \n" \ 121 "__start: \n" \ 122 " mov fp, sp \n" \ 123 " mov r0, fp \n" \ 124 " \n" \ 125 " sub sp, sp, #4+4+(16*4) \n" \ 126 " add r1, sp, #4 \n" \ 127 " \n" \ 128 " ldr r8, .L_GOT \n" \ 129 "1: add r8, pc, r8 \n" \ 130 " ldr r2, .L__DYNAMIC \n" \ 131 " add r2, r2, r8 \n" \ 132 " \n" \ 133 " bl _dl_boot_bind \n" \ 134 " \n" \ 135 " mov sp, fp \n" \ 136 " mov fp, #0 \n" \ 137 " \n" \ 138 " mov r3, #0 /* cleanup */ \n" \ 139 "/* Get argc/argv/envp from stack */ \n" \ 140 " ldr r0, [sp, #0] \n" \ 141 " add r1, sp, #4 \n" \ 142 " add r2, r1, r0, lsl #2 \n" \ 143 " add r2, r2, #4 \n" \ 144 " \n" \ 145 "/* \n" \ 146 " * Ensure the stack is properly \n" \ 147 " * aligned before calling C code. \n" \ 148 " */ \n" \ 149 " bic sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ " \n" \ 150 " b ___start \n" \ 151 " \n" \ 152 ".L_GOT: \n" \ 153 " .long _GLOBAL_OFFSET_TABLE_-(1b+8) \n" \ 154 ".L__DYNAMIC: \n" \ 155 " .long _DYNAMIC(GOTOFF) \n" \ 156 " \n" \ 157 "_csu_abort: \n" \ 158 " udf #0 \n" \ 159 ".previous"); 160