asm.h revision 1.20
1 /* $NetBSD: asm.h,v 1.20 2005/12/31 05:06:33 uwe 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 ; \ 84 1: .long __mcount ; \ 85 2: 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 #ifdef __ELF__ 95 #define ALTENTRY(name) \ 96 .globl _C_LABEL(name) ;\ 97 .type _C_LABEL(name),@function ;\ 98 _C_LABEL(name): 99 #else 100 #define ALTENTRY(name) \ 101 .globl _C_LABEL(name) ;\ 102 _C_LABEL(name): 103 #endif 104 105 106 /* 107 * Hide the gory details of PIC calls vs. normal calls. Use as in the 108 * following example: 109 * 110 * sts.l pr, @-sp 111 * PIC_PROLOGUE(.L_got, r0) ! saves old r12 on stack 112 * ... 113 * mov.l .L_function_1, r0 114 * 1: CALL r0 ! each call site needs a label 115 * nop 116 * ... 117 * mov.l .L_function_2, r0 118 * 2: CALL r0 119 * nop 120 * ... 121 * PIC_EPILOGUE ! restores r12 from stack 122 * lds.l @sp+, pr ! so call in right order 123 * rts 124 * nop 125 * 126 * .align 2 127 * .L_got: 128 * PIC_GOT_DATUM 129 * .L_function_1: ! if you call the same function twice 130 * CALL_DATUM(function, 1b) ! provide call datum for each call 131 * .L_function_2: 132 * CALL_DATUM(function, 2b) 133 */ 134 135 #ifdef PIC 136 137 #define PIC_PLT(x) x@PLT 138 #define PIC_GOT(x) x@GOT 139 #define PIC_GOTOFF(x) x@GOTOFF 140 141 #define PIC_PROLOGUE(got, temp) \ 142 mov.l r12, @-sp; \ 143 mov.l got, r12; \ 144 mova got, temp; \ 145 add temp, r12 146 147 #define PIC_EPILOGUE \ 148 mov.l @sp+, r12 149 150 #define PIC_GOT_DATUM \ 151 .long _GLOBAL_OFFSET_TABLE_ 152 153 #define CALL bsrf 154 #define JUMP braf 155 156 #define CALL_DATUM(function, lpcs) \ 157 .long PIC_PLT(function) - ((lpcs) + 4 - (.)) 158 159 /* 160 * This will result in text relocations in the shared library, 161 * unless the function is local or has hidden or protected visibility. 162 * Does not require PIC prologue. 163 */ 164 #define CALL_DATUM_LOCAL(function, lpcs) \ 165 .long function - ((lpcs) + 4) 166 167 #else /* !PIC */ 168 169 #define PIC_PROLOGUE(label, temp) 170 #define PIC_EPILOGUE 171 #define PIC_GOT_DATUM 172 173 #define CALL jsr @ 174 #define JUMP jmp @ 175 176 #define CALL_DATUM(function, lpcs) \ 177 .long function 178 179 #define CALL_DATUM_LOCAL(function, lpcs) \ 180 .long function 181 182 #endif /* !PIC */ 183 184 185 #define ASMSTR .asciz 186 187 #ifdef __ELF__ 188 #define RCSID(x) .section .ident; .asciz x; .previous 189 #else 190 #define RCSID(x) .text; .asciz x 191 #endif 192 193 #ifdef NO_KERNEL_RCSIDS 194 #define __KERNEL_RCSID(_n, _s) /* nothing */ 195 #else 196 #define __KERNEL_RCSID(_n, _s) RCSID(_s) 197 #endif 198 199 #ifdef __ELF__ 200 #define WEAK_ALIAS(alias,sym) \ 201 .weak _C_LABEL(alias); \ 202 _C_LABEL(alias) = _C_LABEL(sym) 203 #endif 204 205 #define WARN_REFERENCES(_sym,_msg) \ 206 .section .gnu.warning._sym; .ascii _msg; .previous 207 208 #endif /* !_SH3_ASM_H_ */ 209
Indexes created Wed Sep 24 05:09:52 GMT 2025