1 /* $OpenBSD: md_init.h,v 1.9 2017/08/11 20:13:31 guenther 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 " stwu %r1,-16(%r1) \n" \ 49 " mflr %r0 \n" \ 50 " stw %r0,12(%r1) \n" \ 51 " /* fall thru */ \n" \ 52 " .previous") 53 54 55 #define MD_SECTION_EPILOGUE(sect) \ 56 __asm ( \ 57 ".section "#sect",\"ax\",@progbits \n" \ 58 " lwz %r0,12(%r1) \n" \ 59 " mtlr %r0 \n" \ 60 " addi %r1,%r1,16 \n" \ 61 " blr \n" \ 62 " .previous") 63 64 #include <sys/syscall.h> /* for SYS_mprotect */ 65 66 #define STR(x) __STRING(x) 67 68 #define MD_CRT0_START \ 69 __asm( \ 70 " .text \n" \ 71 " .section \".text\" \n" \ 72 " .align 2 \n" \ 73 " .globl _start \n" \ 74 " .type _start, @function \n" \ 75 " .globl __start \n" \ 76 " .type __start, @function \n" \ 77 "_start: \n" \ 78 "__start: \n" \ 79 " # put cleanup in r6 instead of r7 \n" \ 80 " mr %r6, %r7 \n" \ 81 " b ___start \n" \ 82 ) 83 84 #define MD_RCRT0_START \ 85 __asm( \ 86 " .text \n" \ 87 " .section \".text\" \n" \ 88 " .align 2 \n" \ 89 " .globl _start \n" \ 90 " .type _start, @function \n" \ 91 " .globl __start \n" \ 92 " .type __start, @function \n" \ 93 "_start: \n" \ 94 "__start: \n" \ 95 " mr %r19, %r1 # save stack in r19 \n" \ 96 " stwu 1, (-16 -((9+3)*4))(%r1) # allocate dl_data \n" \ 97 " \n" \ 98 " # move argument registers to saved registers for startup flush \n" \ 99 " mr %r20, %r3 # argc \n" \ 100 " mr %r21, %r4 # argv \n" \ 101 " mr %r22, %r5 # envp \n" \ 102 " mflr %r27 /* save off old link register */ \n" \ 103 " stw %r27, 4(%r19) # save in normal location \n" \ 104 " \n" \ 105 " bcl 20, 31, 1f \n" \ 106 "1: mflr %r18 \n" \ 107 " addis %r18, %r18, _DYNAMIC-1b@ha \n" \ 108 " addi %r18, %r18, _DYNAMIC-1b@l \n" \ 109 " \n" \ 110 " subi %r3, %r21, 4 # Get stack pointer (arg0 for _dl_boot). \n" \ 111 " addi %r4, %r1, 8 # dl_data \n" \ 112 " mr %r5, %r18 # dynamicp \n" \ 113 " \n" \ 114 " bl _dl_boot_bind@local \n" \ 115 " \n" \ 116 " mtlr %r27 \n" \ 117 " # move argument registers back from saved registers \n" \ 118 " mr %r3, %r20 \n" \ 119 " mr %r4, %r21 \n" \ 120 " mr %r5, %r22 \n" \ 121 " li %r6, 0 \n" \ 122 " b ___start \n" \ 123 " \n" \ 124 " .text \n" \ 125 " .align 2 \n" \ 126 " .globl _dl_exit \n" \ 127 " .type _dl_exit, @function \n" \ 128 "_dl_exit: \n" \ 129 " li %r0, " STR(SYS_exit) " \n" \ 130 " sc \n" \ 131 " blr \n" \ 132 ) 133