Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/include/asm.h
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1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 5 * Copyright (C) 1995, 1996 TooLs GmbH. 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 TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 * $NetBSD: asm.h,v 1.6.18.1 2000/07/25 08:37:14 kleink Exp $ 34 * $FreeBSD$ 35 */ 36 37 #ifndef _MACHINE_ASM_H_ 38 #define _MACHINE_ASM_H_ 39 40 #include <sys/cdefs.h> 41 42 #if defined(PIC) && !defined(__powerpc64__) 43 #define PIC_PROLOGUE XXX 44 #define PIC_EPILOGUE XXX 45 #define PIC_PLT(x) x@plt 46 #ifdef __STDC__ 47 #define PIC_GOT(x) XXX 48 #else /* not __STDC__ */ 49 #define PIC_GOT(x) XXX 50 #endif /* __STDC__ */ 51 #else 52 #define PIC_PROLOGUE 53 #define PIC_EPILOGUE 54 #define PIC_PLT(x) x 55 #define PIC_GOT(x) x 56 #endif 57 58 #define CNAME(csym) csym 59 #define ASMNAME(asmsym) asmsym 60 #ifdef __powerpc64__ 61 #define HIDENAME(asmsym) __CONCAT(_,asmsym) 62 #else 63 #define HIDENAME(asmsym) __CONCAT(.,asmsym) 64 #endif 65 66 #if !defined(_CALL_ELF) || _CALL_ELF == 1 67 #ifdef _KERNEL 68 /* ELFv1 kernel uses global dot symbols */ 69 #define DOT_LABEL(name) __CONCAT(.,name) 70 #define TYPE_ENTRY(name) .size name,24; \ 71 .type DOT_LABEL(name),@function; \ 72 .globl DOT_LABEL(name); 73 #define END_SIZE(name) .size DOT_LABEL(name),.-DOT_LABEL(name); 74 #else /* !_KERNEL */ 75 /* ELFv1 user code uses local function entry points */ 76 #define DOT_LABEL(name) __CONCAT(.L.,name) 77 #define TYPE_ENTRY(name) .type name,@function; 78 #define END_SIZE(name) .size name,.-DOT_LABEL(name); 79 #endif /* _KERNEL */ 80 #else 81 /* ELFv2 doesn't have any of this complication */ 82 #define DOT_LABEL(name) name 83 #define TYPE_ENTRY(name) .type name,@function; 84 #define END_SIZE(name) .size name,.-DOT_LABEL(name); 85 #endif 86 87 #define _GLOBAL(name) \ 88 .data; \ 89 .p2align 2; \ 90 .globl name; \ 91 name: 92 93 #ifdef __powerpc64__ 94 #define TOC_NAME_FOR_REF(name) __CONCAT(.L,name) 95 #define TOC_REF(name) TOC_NAME_FOR_REF(name)@toc 96 #define TOC_ENTRY(name) \ 97 .section ".toc","aw"; \ 98 TOC_NAME_FOR_REF(name): \ 99 .tc name[TC],name 100 #endif 101 102 #ifdef __powerpc64__ 103 104 #if !defined(_CALL_ELF) || _CALL_ELF == 1 105 #define _ENTRY(name) \ 106 .section ".text"; \ 107 .p2align 2; \ 108 .globl name; \ 109 .section ".opd","aw"; \ 110 .p2align 3; \ 111 name: \ 112 .quad DOT_LABEL(name),.TOC.@tocbase,0; \ 113 .previous; \ 114 .p2align 4; \ 115 TYPE_ENTRY(name) \ 116 DOT_LABEL(name): \ 117 .cfi_startproc 118 #define _NAKED_ENTRY(name) _ENTRY(name) 119 #else 120 #define _ENTRY(name) \ 121 .text; \ 122 .p2align 4; \ 123 .globl name; \ 124 .type name,@function; \ 125 name: \ 126 .cfi_startproc; \ 127 addis %r2, %r12, (.TOC.-name)@ha; \ 128 addi %r2, %r2, (.TOC.-name)@l; \ 129 .localentry name, .-name; 130 131 /* "Naked" function entry. No TOC prologue for ELFv2. */ 132 #define _NAKED_ENTRY(name) \ 133 .text; \ 134 .p2align 4; \ 135 .globl name; \ 136 .type name,@function; \ 137 name: \ 138 .cfi_startproc; \ 139 .localentry name, .-name; 140 #endif 141 142 #define _END(name) \ 143 .cfi_endproc; \ 144 .long 0; \ 145 .byte 0,0,0,0,0,0,0,0; \ 146 END_SIZE(name) 147 148 #define LOAD_ADDR(reg, var) \ 149 lis reg, var@highest; \ 150 ori reg, reg, var@higher; \ 151 rldicr reg, reg, 32, 31; \ 152 oris reg, reg, var@h; \ 153 ori reg, reg, var@l; 154 #else /* !__powerpc64__ */ 155 #define _ENTRY(name) \ 156 .text; \ 157 .p2align 4; \ 158 .globl name; \ 159 .type name,@function; \ 160 name: \ 161 .cfi_startproc 162 #define _END(name) \ 163 .cfi_endproc; \ 164 .size name, . - name 165 166 #define _NAKED_ENTRY(name) _ENTRY(name) 167 168 #define LOAD_ADDR(reg, var) \ 169 lis reg, var@ha; \ 170 ori reg, reg, var@l; 171 #endif /* __powerpc64__ */ 172 173 #if defined(PROF) || (defined(_KERNEL) && defined(GPROF)) 174 # ifdef __powerpc64__ 175 # define _PROF_PROLOGUE mflr 0; \ 176 std 3,48(1); \ 177 std 4,56(1); \ 178 std 5,64(1); \ 179 std 0,16(1); \ 180 stdu 1,-112(1); \ 181 bl _mcount; \ 182 nop; \ 183 ld 0,112+16(1); \ 184 ld 3,112+48(1); \ 185 ld 4,112+56(1); \ 186 ld 5,112+64(1); \ 187 mtlr 0; \ 188 addi 1,1,112 189 # else 190 # define _PROF_PROLOGUE mflr 0; stw 0,4(1); bl _mcount 191 # endif 192 #else 193 # define _PROF_PROLOGUE 194 #endif 195 196 #define ASEND(y) _END(ASMNAME(y)) 197 #define ASENTRY(y) _ENTRY(ASMNAME(y)); _PROF_PROLOGUE 198 #define END(y) _END(CNAME(y)) 199 #define ENTRY(y) _ENTRY(CNAME(y)); _PROF_PROLOGUE 200 #define GLOBAL(y) _GLOBAL(CNAME(y)) 201 202 #define ASENTRY_NOPROF(y) _ENTRY(ASMNAME(y)) 203 #define ENTRY_NOPROF(y) _ENTRY(CNAME(y)) 204 205 /* Load NIA without affecting branch prediction */ 206 #define LOAD_LR_NIA bcl 20, 31, .+4 207 208 /* 209 * Magic sequence to return to native endian. 210 * Overwrites r0 and r11. 211 * 212 * The encoding of the instruction "tdi 0, %r0, 0x48" in opposite endian 213 * happens to be "b . + 8". This is useful because we can write a sequence 214 * of instructions that can execute in either endian. 215 * 216 * Use a sequence of handcoded instructions that switches contexts to the 217 * instruction following the sequence, but with the correct PSL_LE bit. 218 * 219 * The same sequence works for both BE and LE because the xori will flip 220 * the bit to the other state, and the code only runs when running in the 221 * wrong endian. 222 * 223 * This sequence is NMI-reentrant. 224 * 225 * Do not change the length of this sequence without looking at the users, 226 * this is used in size-constrained places like the reset vector! 227 */ 228 #define RETURN_TO_NATIVE_ENDIAN \ 229 tdi 0, %r0, 0x48; /* Endian swapped: b . + 8 */\ 230 b 1f; /* Will fall through to here if correct */\ 231 .long 0xa600607d; /* mfmsr %r11 */\ 232 .long 0x00000038; /* li %r0, 0 */\ 233 .long 0x6401617d; /* mtmsrd %r0, 1 (L=1 EE,RI bits only) */\ 234 .long 0x01006b69; /* xori %r11, %r11, 0x1 (PSL_LE) */\ 235 .long 0xa602087c; /* mflr %r0 */\ 236 .long 0x05009f42; /* LOAD_LR_NIA */\ 237 .long 0xa6037b7d; /* 0: mtsrr1 %r11 */\ 238 .long 0xa602687d; /* mflr %r11 */\ 239 .long 0x18006b39; /* addi %r11, %r11, (1f - 0b) */\ 240 .long 0xa6037a7d; /* mtsrr0 %r11 */\ 241 .long 0xa603087c; /* mtlr %r0 */\ 242 .long 0x2400004c; /* rfid */\ 243 1: /* RETURN_TO_NATIVE_ENDIAN */ 244 245 #define ASMSTR .asciz 246 247 #define RCSID(x) .text; .asciz x 248 249 #undef __FBSDID 250 #if !defined(lint) && !defined(STRIP_FBSDID) 251 #define __FBSDID(s) .ident s 252 #else 253 #define __FBSDID(s) /* nothing */ 254 #endif /* not lint and not STRIP_FBSDID */ 255 256 #define WEAK_REFERENCE(sym, alias) \ 257 .weak alias; \ 258 .equ alias,sym 259 260 #ifdef __STDC__ 261 #define WARN_REFERENCES(_sym,_msg) \ 262 .section .gnu.warning. ## _sym ; .ascii _msg ; .text 263 #else 264 #define WARN_REFERENCES(_sym,_msg) \ 265 .section .gnu.warning./**/_sym ; .ascii _msg ; .text 266 #endif /* __STDC__ */ 267 268 #endif /* !_MACHINE_ASM_H_ */
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