1 /* $OpenBSD: asm.h,v 1.1.1.1 2006/10/06 21:02:55 miod Exp $ */ 2 /* $NetBSD: asm.h,v 1.25 2006/01/20 22:02:40 christos Exp $ */ 3 4 /*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)asm.h 5.5 (Berkeley) 5/7/91 36 */ 37 38 #ifndef _SH_ASM_H_ 39 #define _SH_ASM_H_ 40 41 #ifdef __ELF__ 42 # define _C_LABEL(x) x 43 #else 44 #ifdef __STDC__ 45 # define _C_LABEL(x) _ ## x 46 #else 47 # define _C_LABEL(x) _/**/x 48 #endif 49 #endif 50 #define _ASM_LABEL(x) x 51 52 #ifdef __STDC__ 53 # define __CONCAT(x,y) x ## y 54 # define __STRING(x) #x 55 #else 56 # define __CONCAT(x,y) x/**/y 57 # define __STRING(x) "x" 58 #endif 59 60 /* let kernels and others override entrypoint alignment */ 61 #ifndef _ALIGN_TEXT 62 # define _ALIGN_TEXT .align 2 63 #endif 64 65 #ifdef __ELF__ 66 #define _ENTRY(x) \ 67 .text ;\ 68 _ALIGN_TEXT ;\ 69 .globl x ;\ 70 .type x,@function ;\ 71 x: 72 #else /* !__ELF__ */ 73 #define _ENTRY(x) \ 74 .text ;\ 75 _ALIGN_TEXT ;\ 76 .globl x ;\ 77 x: 78 #endif /* !__ELF__ */ 79 80 #ifdef GPROF 81 #define _PROF_PROLOGUE \ 82 mov.l 1f,r1 ; \ 83 mova 2f,r0 ; \ 84 jmp @r1 ; \ 85 nop ; \ 86 .align 2 ; \ 87 1: .long __mcount ; \ 88 2: 89 #else /* !GPROF */ 90 #define _PROF_PROLOGUE 91 #endif /* !GPROF */ 92 93 #define ENTRY(y) _ENTRY(_C_LABEL(y)) _PROF_PROLOGUE 94 #define NENTRY(y) _ENTRY(_C_LABEL(y)) 95 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)) _PROF_PROLOGUE 96 97 #define SET_ENTRY_SIZE(y) \ 98 .size _C_LABEL(y), . - _C_LABEL(y) 99 100 #define SET_ASENTRY_SIZE(y) \ 101 .size _ASM_LABEL(y), . - _ASM_LABEL(y) 102 103 #ifdef __ELF__ 104 #define ALTENTRY(name) \ 105 .globl _C_LABEL(name) ;\ 106 .type _C_LABEL(name),@function ;\ 107 _C_LABEL(name): 108 #else 109 #define ALTENTRY(name) \ 110 .globl _C_LABEL(name) ;\ 111 _C_LABEL(name): 112 #endif 113 114 115 /* 116 * Hide the gory details of PIC calls vs. normal calls. Use as in the 117 * following example: 118 * 119 * sts.l pr, @-sp 120 * PIC_PROLOGUE(.L_got, r0) ! saves old r12 on stack 121 * ... 122 * mov.l .L_function_1, r0 123 * 1: CALL r0 ! each call site needs a label 124 * nop 125 * ... 126 * mov.l .L_function_2, r0 127 * 2: CALL r0 128 * nop 129 * ... 130 * PIC_EPILOGUE ! restores r12 from stack 131 * lds.l @sp+, pr ! so call in right order 132 * rts 133 * nop 134 * 135 * .align 2 136 * .L_got: 137 * PIC_GOT_DATUM 138 * .L_function_1: ! if you call the same function twice 139 * CALL_DATUM(function, 1b) ! provide call datum for each call 140 * .L_function_2: 141 * CALL_DATUM(function, 2b) 142 */ 143 144 #ifdef PIC 145 146 #define PIC_PLT(x) x@PLT 147 #define PIC_GOT(x) x@GOT 148 #define PIC_GOTOFF(x) x@GOTOFF 149 150 #define PIC_PROLOGUE(got) \ 151 mov.l r12, @-sp; \ 152 PIC_PROLOGUE_NOSAVE(got) 153 154 /* 155 * Functions that do non local jumps don't need to preserve r12, 156 * so we can shave off two instructions to save/restore it. 157 */ 158 #define PIC_PROLOGUE_NOSAVE(got) \ 159 mov.l got, r12; \ 160 mova got, r0; \ 161 add r0, r12 162 163 #define PIC_EPILOGUE \ 164 mov.l @sp+, r12 165 166 #define PIC_EPILOGUE_SLOT \ 167 PIC_EPILOGUE 168 169 #define PIC_GOT_DATUM \ 170 .long _GLOBAL_OFFSET_TABLE_ 171 172 #define CALL bsrf 173 #define JUMP braf 174 175 #define CALL_DATUM(function, lpcs) \ 176 .long PIC_PLT(function) - ((lpcs) + 4 - (.)) 177 178 /* 179 * This will result in text relocations in the shared library, 180 * unless the function is local or has hidden or protected visibility. 181 * Does not require PIC prologue. 182 */ 183 #define CALL_DATUM_LOCAL(function, lpcs) \ 184 .long function - ((lpcs) + 4) 185 186 #else /* !PIC */ 187 188 #define PIC_PROLOGUE(label) 189 #define PIC_PROLOGUE_NOSAVE(label) 190 #define PIC_EPILOGUE 191 #define PIC_EPILOGUE_SLOT nop 192 #define PIC_GOT_DATUM 193 194 #define CALL jsr @ 195 #define JUMP jmp @ 196 197 #define CALL_DATUM(function, lpcs) \ 198 .long function 199 200 #define CALL_DATUM_LOCAL(function, lpcs) \ 201 .long function 202 203 #endif /* !PIC */ 204 205 206 #define ASMSTR .asciz 207 208 #ifdef __ELF__ 209 #define WEAK_ALIAS(alias,sym) \ 210 .weak _C_LABEL(alias); \ 211 _C_LABEL(alias) = _C_LABEL(sym) 212 #endif 213 214 #define WARN_REFERENCES(_sym,_msg) \ 215 .section .gnu.warning._sym; .ascii _msg; .previous 216 217 #endif /* !_SH_ASM_H_ */ 218
