1 /* $OpenBSD: md_init.h,v 1.4 2013/12/03 06:21:40 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 #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 #define MD_CRT0_START \ 76 __asm( \ 77 ".text \n" \ 78 " .align 0 \n" \ 79 " .globl _start \n" \ 80 " .globl __start \n" \ 81 "_start: \n" \ 82 "__start: \n" \ 83 " mov r3, r0 /* cleanup */ \n" \ 84 "/* Get argc/argv/envp from stack */ \n" \ 85 " ldr r0, [sp, #0x0000] \n" \ 86 " add r1, sp, #0x0004 \n" \ 87 " add r2, r1, r0, lsl #2 \n" \ 88 " add r2, r2, #0x0004 \n" \ 89 " \n" \ 90 "/* \n" \ 91 " * Ensure the stack is properly \n" \ 92 " * aligned before calling C code. \n" \ 93 " */ \n" \ 94 /* #if 1 */ \ 95 " bic sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ " \n" \ 96 /* #endif */ \ 97 " sub sp, sp, #8 \n" \ 98 " str r5, [sp, #4] \n" \ 99 " str r4, [sp, #0] \n" \ 100 " \n" \ 101 " b ___start \n" \ 102 ".previous"); 103