1 /* $OpenBSD: md_init.h,v 1.8 2016/09/08 18:56:58 kettenis 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 #ifdef __PIC__ 37 /* This nastyness derived from gcc3 output */ 38 #define MD_SECT_CALL_FUNC(section, func) \ 39 __asm (".section "#section", \"ax\" \n" \ 40 " bl " #func "(PLT) \n" \ 41 " .previous") 42 #else 43 #define MD_SECT_CALL_FUNC(section, func) \ 44 __asm (".section "#section", \"ax\" \n" \ 45 " adr r0, 1f \n" \ 46 " ldr r0, [r0] \n" \ 47 " adr lr, 2f \n" \ 48 " mov pc, r0 \n" \ 49 "1: .word " #func " \n" \ 50 "2: \n" \ 51 " .previous") 52 #endif 53 54 #define MD_SECTION_PROLOGUE(sect, entry_pt) \ 55 __asm ( \ 56 ".section "#sect",\"ax\",%progbits \n" \ 57 " .globl " #entry_pt " \n" \ 58 " .type " #entry_pt ",%function \n" \ 59 " .align 4 \n" \ 60 #entry_pt": \n" \ 61 " mov ip, sp \n" \ 62 " stmfd sp!, {fp, ip, lr, pc} \n" \ 63 " sub fp, ip, #4 \n" \ 64 " /* fall thru */ \n" \ 65 " .previous") 66 67 68 #define MD_SECTION_EPILOGUE(sect) \ 69 __asm ( \ 70 ".section "#sect",\"ax\",%progbits \n" \ 71 " ldmea fp, {fp, sp, pc} \n" \ 72 " .previous") 73 74 75 /* 76 * The definitions of environ and __progname prevent the creation 77 * of COPY relocations for WEAK symbols. 78 */ 79 #define MD_CRT0_START \ 80 char **environ, *__progname; \ 81 __asm( \ 82 ".text \n" \ 83 " .align 0 \n" \ 84 " .globl _start \n" \ 85 " .globl __start \n" \ 86 "_start: \n" \ 87 "__start: \n" \ 88 " mov r3, r0 /* cleanup */ \n" \ 89 "/* Get argc/argv/envp from stack */ \n" \ 90 " ldr r0, [sp, #0] \n" \ 91 " add r1, sp, #4 \n" \ 92 " add r2, r1, r0, lsl #2 \n" \ 93 " add r2, r2, #4 \n" \ 94 " \n" \ 95 "/* \n" \ 96 " * Ensure the stack is properly \n" \ 97 " * aligned before calling C code. \n" \ 98 " */ \n" \ 99 " bic sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ " \n" \ 100 " b ___start \n" \ 101 ".previous"); 102 103 #define MD_RCRT0_START \ 104 char **environ, *__progname; \ 105 __asm( \ 106 ".text \n" \ 107 " .align 0 \n" \ 108 " .globl _start \n" \ 109 " .globl __start \n" \ 110 "_start: \n" \ 111 "__start: \n" \ 112 " mov fp, sp \n" \ 113 " mov r0, fp \n" \ 114 " \n" \ 115 " sub sp, sp, #4+4+(16*4) \n" \ 116 " add r1, sp, #4 \n" \ 117 " \n" \ 118 " ldr r8, .L_GOT \n" \ 119 "1: add r8, pc, r8 \n" \ 120 " ldr r2, .L__DYNAMIC \n" \ 121 " add r2, r2, r8 \n" \ 122 " \n" \ 123 " bl _dl_boot_bind \n" \ 124 " \n" \ 125 " mov sp, fp \n" \ 126 " mov fp, #0 \n" \ 127 " \n" \ 128 " mov r3, #0 /* cleanup */ \n" \ 129 "/* Get argc/argv/envp from stack */ \n" \ 130 " ldr r0, [sp, #0] \n" \ 131 " add r1, sp, #4 \n" \ 132 " add r2, r1, r0, lsl #2 \n" \ 133 " add r2, r2, #4 \n" \ 134 " \n" \ 135 "/* \n" \ 136 " * Ensure the stack is properly \n" \ 137 " * aligned before calling C code. \n" \ 138 " */ \n" \ 139 " bic sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ " \n" \ 140 " b ___start \n" \ 141 " \n" \ 142 ".L_GOT: \n" \ 143 " .long _GLOBAL_OFFSET_TABLE_-(1b+8) \n" \ 144 ".L__DYNAMIC: \n" \ 145 " .long _DYNAMIC(GOTOFF) \n" \ 146 " \n" \ 147 "_dl_exit: \n" \ 148 " mov r12, #1 \n" \ 149 " swi #0 \n" \ 150 "_dl_printf: \n" \ 151 " mov pc, lr \n" \ 152 ".previous"); 153