1 /* $OpenBSD: asm.h,v 1.2 2021/05/12 01:20:52 jsg Exp $ */ 2 3 /* 4 * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com> 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 * from: @(#)asm.h 5.5 (Berkeley) 5/7/91 36 */ 37 38 #ifndef _MACHINE_ASM_H_ 39 #define _MACHINE_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 #ifndef _ALIGN_TEXT 61 # define _ALIGN_TEXT .align 0 62 #endif 63 64 #if defined(PROF) || defined(GPROF) 65 // XXX Profiler Support 66 #define _PROF_PROLOGUE \ 67 addi sp, sp, -16; \ 68 sd ra, 8(sp); \ 69 sd fp, 0(sp); \ 70 mv fp, sp; \ 71 call __mcount; \ 72 ld ra, 8(sp); \ 73 ld fp, 0(sp); \ 74 add sp, sp, 16; 75 #else 76 #define _PROF_PROLOGUE 77 #endif 78 79 #if defined(_RET_PROTECTOR) 80 // XXX Retguard Support 81 #error RETGUARD not yet supported for riscv64 82 #else 83 #define RETGUARD_CALC_COOKIE(reg) 84 #define RETGUARD_LOAD_RANDOM(x, reg) 85 #define RETGUARD_SETUP(x, reg) 86 #define RETGUARD_CHECK(x, reg) 87 #define RETGUARD_PUSH(reg) 88 #define RETGUARD_POP(reg) 89 #define RETGUARD_SYMBOL(x) 90 #endif 91 92 #define _ENTRY(x) \ 93 .text; .globl x; .type x,@function; .p2align 1; x: 94 #define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE 95 #define ENTRY_NP(y) _ENTRY(_C_LABEL(y)) 96 #define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE 97 #define ASENTRY_NP(y) _ENTRY(_ASM_LABEL(y)) 98 #define END(y) .size y, . - y 99 #define EENTRY(sym) .globl sym; sym: 100 #define EEND(sym) 101 102 #if defined(__ELF__) && defined(__PIC__) 103 #ifdef __STDC__ 104 #define PIC_SYM(x,y) x ## ( ## y ## ) 105 #else 106 #define PIC_SYM(x,y) x/**/(/**/y/**/) 107 #endif 108 #else 109 #define PIC_SYM(x,y) x 110 #endif 111 112 #ifdef __ELF__ 113 #define STRONG_ALIAS(alias,sym) \ 114 .global alias; \ 115 alias = sym 116 #define WEAK_ALIAS(alias,sym) \ 117 .weak alias; \ 118 alias = sym 119 #endif 120 121 #ifdef __STDC__ 122 #define WARN_REFERENCES(sym,msg) \ 123 .stabs msg ## ,30,0,0,0 ; \ 124 .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0 125 #elif defined(__ELF__) 126 #define WARN_REFERENCES(sym,msg) \ 127 .stabs msg,30,0,0,0 ; \ 128 .stabs __STRING(sym),1,0,0,0 129 #else 130 #define WARN_REFERENCES(sym,msg) \ 131 .stabs msg,30,0,0,0 ; \ 132 .stabs __STRING(_/**/sym),1,0,0,0 133 #endif /* __STDC__ */ 134 135 #define WEAK_REFERENCE(sym, alias) \ 136 .weak alias; \ 137 .set alias,sym 138 139 #define SWAP_FAULT_HANDLER(handler, tmp0, tmp1) \ 140 ld tmp0, CI_CURPCB(tp); /* Load the pcb */ \ 141 ld tmp1, PCB_ONFAULT(tmp0); /* Save old handler */ \ 142 sd handler, PCB_ONFAULT(tmp0); /* Set the handler */ \ 143 mv handler, tmp1 144 145 #define SET_FAULT_HANDLER(handler, pcb) \ 146 ld pcb, CI_CURPCB(tp); /* Load the pcb */ \ 147 sd handler, PCB_ONFAULT(pcb) /* Set the handler */ 148 149 #define ENTER_USER_ACCESS(tmp) \ 150 li tmp, SSTATUS_SUM; \ 151 csrs sstatus, tmp 152 153 #define EXIT_USER_ACCESS(tmp) \ 154 li tmp, SSTATUS_SUM; \ 155 csrc sstatus, tmp 156 157 #endif /* _MACHINE_ASM_H_ */ 158