1/* $NetBSD: asm.h,v 1.29 2020/04/17 14:19:44 joerg Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)asm.h 5.5 (Berkeley) 5/7/91 35 */ 36 37#ifndef _SH3_ASM_H_ 38#define _SH3_ASM_H_ 39 40/* 41 * The old NetBSD/sh3 ELF toolchain used underscores. The new 42 * NetBSD/sh3 ELF toolchain does not. The C pre-processor 43 * defines __NO_LEADING_UNDERSCORES__ for the new ELF toolchain. 44 */ 45 46#if defined(__ELF__) && defined(__NO_LEADING_UNDERSCORES__) 47# define _C_LABEL(x) x 48#else 49#ifdef __STDC__ 50# define _C_LABEL(x) _ ## x 51#else 52# define _C_LABEL(x) _/**/x 53#endif 54#endif 55#define _ASM_LABEL(x) x 56 57/* let kernels and others override entrypoint alignment */ 58#ifndef _ALIGN_TEXT 59# define _ALIGN_TEXT .align 2 60#endif 61 62#ifdef __ELF__ 63#define _ENTRY(x) \ 64 .text ;\ 65 _ALIGN_TEXT ;\ 66 .globl x ;\ 67 .type x,@function ;\ 68 x: 69#else /* !__ELF__ */ 70#define _ENTRY(x) \ 71 .text ;\ 72 _ALIGN_TEXT ;\ 73 .globl x ;\ 74 x: 75#endif /* !__ELF__ */ 76 77#ifdef GPROF 78#define _PROF_PROLOGUE \ 79 mov.l 1f,r1 ; \ 80 mova 2f,r0 ; \ 81 jmp @r1 ; \ 82 nop ; \ 83 .align 2 ; \ 841: .long __mcount ; \ 852: 86#else /* !GPROF */ 87#define _PROF_PROLOGUE 88#endif /* !GPROF */ 89 90#define ENTRY(y) _ENTRY(_C_LABEL(y)) _PROF_PROLOGUE 91#define NENTRY(y) _ENTRY(_C_LABEL(y)) 92#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)) _PROF_PROLOGUE 93 94#define SET_ENTRY_SIZE(y) \ 95 .size _C_LABEL(y), . - _C_LABEL(y) 96 97#define SET_ASENTRY_SIZE(y) \ 98 .size _ASM_LABEL(y), . - _ASM_LABEL(y) 99 100#ifdef __ELF__ 101#define ALTENTRY(name) \ 102 .globl _C_LABEL(name) ;\ 103 .type _C_LABEL(name),@function ;\ 104 _C_LABEL(name): 105#else 106#define ALTENTRY(name) \ 107 .globl _C_LABEL(name) ;\ 108 _C_LABEL(name): 109#endif 110 111 112/* 113 * Hide the gory details of PIC calls vs. normal calls. Use as in the 114 * following example: 115 * 116 * sts.l pr, @-sp 117 * PIC_PROLOGUE(.L_got, r0) ! saves old r12 on stack 118 * ... 119 * mov.l .L_function_1, r0 120 * 1: CALL r0 ! each call site needs a label 121 * nop 122 * ... 123 * mov.l .L_function_2, r0 124 * 2: CALL r0 125 * nop 126 * ... 127 * PIC_EPILOGUE ! restores r12 from stack 128 * lds.l @sp+, pr ! so call in right order 129 * rts 130 * nop 131 * 132 * .align 2 133 * .L_got: 134 * PIC_GOT_DATUM 135 * .L_function_1: ! if you call the same function twice 136 * CALL_DATUM(function, 1b) ! provide call datum for each call 137 * .L_function_2: 138 * CALL_DATUM(function, 2b) 139 */ 140 141#ifdef __PIC__ 142 143#define PIC_PLT(x) x@PLT 144#define PIC_GOT(x) x@GOT 145#define PIC_GOTOFF(x) x@GOTOFF 146 147#define PIC_PROLOGUE(got) \ 148 mov.l r12, @-sp; \ 149 PIC_PROLOGUE_NOSAVE(got) 150 151/* 152 * Functions that do non local jumps don't need to preserve r12, 153 * so we can shave off two instructions to save/restore it. 154 */ 155#define PIC_PROLOGUE_NOSAVE(got) \ 156 mov.l got, r12; \ 157 mova got, r0; \ 158 add r0, r12 159 160#define PIC_EPILOGUE \ 161 mov.l @sp+, r12 162 163#define PIC_EPILOGUE_SLOT \ 164 PIC_EPILOGUE 165 166#define PIC_GOT_DATUM \ 167 .long _GLOBAL_OFFSET_TABLE_ 168 169#define CALL bsrf 170#define JUMP braf 171 172#define CALL_DATUM(function, lpcs) \ 173 .long PIC_PLT(function) - ((lpcs) + 4 - (.)) 174 175/* 176 * This will result in text relocations in the shared library, 177 * unless the function is local or has hidden or protected visibility. 178 * Does not require PIC prologue. 179 */ 180#define CALL_DATUM_LOCAL(function, lpcs) \ 181 .long function - ((lpcs) + 4) 182 183#else /* !__PIC__ */ 184 185#define PIC_PROLOGUE(label) 186#define PIC_PROLOGUE_NOSAVE(label) 187#define PIC_EPILOGUE 188#define PIC_EPILOGUE_SLOT nop 189#define PIC_GOT_DATUM 190 191#define CALL jsr @ 192#define JUMP jmp @ 193 194#define CALL_DATUM(function, lpcs) \ 195 .long function 196 197#define CALL_DATUM_LOCAL(function, lpcs) \ 198 .long function 199 200#endif /* !__PIC__ */ 201 202 203#define ASMSTR .asciz 204 205#ifdef __ELF__ 206#define RCSID(x) .pushsection ".ident","MS",@progbits,1; \ 207 .asciz x; \ 208 .popsection 209#else 210#define RCSID(x) .text; .asciz x 211#endif 212 213#ifdef NO_KERNEL_RCSIDS 214#define __KERNEL_RCSID(_n, _s) /* nothing */ 215#else 216#define __KERNEL_RCSID(_n, _s) RCSID(_s) 217#endif 218 219#ifdef __ELF__ 220#define WEAK_ALIAS(alias,sym) \ 221 .weak _C_LABEL(alias); \ 222 _C_LABEL(alias) = _C_LABEL(sym) 223#endif 224 225/* 226 * STRONG_ALIAS: create a strong alias. 227 */ 228#define STRONG_ALIAS(alias,sym) \ 229 .globl _C_LABEL(alias); \ 230 _C_LABEL(alias) = _C_LABEL(sym) 231 232#ifdef __STDC__ 233#define WARN_REFERENCES(sym,msg) \ 234 .pushsection .gnu.warning. ## sym; \ 235 .ascii msg; \ 236 .popsection 237#else 238#define WARN_REFERENCES(sym,msg) \ 239 .pushsection .gnu.warning./**/sym; \ 240 .ascii msg; \ 241 .popsection 242#endif /* __STDC__ */ 243 244#endif /* !_SH3_ASM_H_ */ 245