1 /* $OpenBSD: md_init.h,v 1.10 2020/10/15 16:30:23 deraadt Exp $ */ 2 /* $NetBSD: dot_init.h,v 1.3 2005/12/24 22:02:10 perry Exp $ */ 3 4 /*- 5 * Copyright (c) 2001 Ross Harvey 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the NetBSD 19 * Foundation, Inc. and its contributors. 20 * 4. Neither the name of The NetBSD Foundation nor the names of its 21 * contributors may be used to endorse or promote products derived 22 * from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 28 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #define MD_SECTION_PROLOGUE(sect, entry_pt) \ 38 __asm ( \ 39 ".section "#sect",\"ax\",@progbits \n" \ 40 " .globl " #entry_pt " \n" \ 41 " .type " #entry_pt ",@function \n" \ 42 #entry_pt": \n" \ 43 " sts.l pr, @-r15 \n" \ 44 " .align 2 \n" \ 45 " /* fall thru */ \n" \ 46 ".previous") 47 48 #define MD_SECTION_EPILOGUE(sect) \ 49 __asm ( \ 50 ".section "#sect",\"ax\",@progbits \n" \ 51 " lds.l @r15+, pr \n" \ 52 " rts \n" \ 53 " nop \n" \ 54 ".previous") 55 56 /* 57 * We need to put the function pointer in our own constant 58 * pool (otherwise it might be too far away to reference). 59 */ 60 #define MD_SECT_CALL_FUNC(section, func) \ 61 __asm(".section " #section "\n" \ 62 " mov.l 1f, r1 \n" \ 63 " mova 2f, r0 \n" \ 64 " braf r1 \n" \ 65 " lds r0, pr \n" \ 66 "0: .p2align 2 \n" \ 67 "1: .long " #func " - 0b \n" \ 68 "2: .previous"); 69 70 71 #if defined(__SH4__) && !defined(__SH4_NOFPU__) 72 #include <machine/fpu.h> 73 74 #define MD_FPU_START \ 75 void __set_fpscr(unsigned int); \ 76 unsigned int __fpscr_values[2]; 77 78 #define MD_START_SETUP \ 79 __set_fpscr(0); \ 80 __fpscr_values[0] |= FPSCR_DN; \ 81 __fpscr_values[1] |= FPSCR_DN; \ 82 __asm volatile ("lds %0, fpscr" \ 83 : : "r" (__fpscr_values[1])); 84 #else 85 #define MD_FPU_START 86 #endif /* defined(__SH4__) && !defined(__SH4_NOFPU__) */ 87 88 #define MD_CRT0_START \ 89 MD_FPU_START \ 90 __asm (".globl __start; __start = ___start") 91 92 #define MD_RCRT0_START \ 93 MD_FPU_START \ 94 __asm ( \ 95 ".text \n" \ 96 " .align 2 \n" \ 97 " .globl __start \n" \ 98 " .type __start,@function \n" \ 99 "__start: \n" \ 100 " mov r15, r12 \n" \ 101 " mov r15, r4 \n" \ 102 " add #-72, r15 \n" \ 103 " mov r15, r5 \n" \ 104 " bsr 1f \n" \ 105 " nop \n" \ 106 "1: \n" \ 107 ".L_offbase: \n" \ 108 " sts pr, r0 \n" \ 109 " mov.l .L_dynamic, r6 \n" \ 110 " add r0, r6 \n" \ 111 " mov.l .L_boot_bind, r0 \n" \ 112 " bsrf r0 \n" \ 113 " nop \n" \ 114 ".L_call_boot_bind: \n" \ 115 " mov r12, r15 \n" \ 116 " mov.l @r15, r4 /* argc */ \n" \ 117 " mov r15, r5 \n" \ 118 " add #4, r5 /* argv */ \n" \ 119 " mov r4, r6 \n" \ 120 " add #1, r6 \n" \ 121 " shll2 r6 \n" \ 122 " add r5, r6 /* envp */ \n" \ 123 " bra ___start \n" \ 124 " mov #0, r7 /* cleanup */ \n" \ 125 " .align 2 \n" \ 126 ".L_boot_bind: \n" \ 127 " .long _dl_boot_bind - .L_call_boot_bind \n" \ 128 ".L_datasize: \n" \ 129 " .long 4 + 4 + (16 * 4) \n" \ 130 ".L_dynamic: \n" \ 131 " .long _DYNAMIC - .L_offbase \n" \ 132 \ 133 " .align 2 \n" \ 134 " .globl _dl_exit \n" \ 135 " .type _dl_exit,@function \n" \ 136 "_dl_exit: \n" \ 137 " mov #" STR(SYS_exit) ", r0 \n" \ 138 " .word 0xc380 /* trapa #0x80 */ \n" \ 139 " sleep /* illegal */ \n" \ 140 ".previous") 141