1 /* $OpenBSD: asm.h,v 1.8 2022/12/06 00:08:38 jca 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 #define _C_LABEL(x) x 42 #define _ASM_LABEL(x) x 43 44 #ifdef __STDC__ 45 # define __CONCAT(x,y) x ## y 46 # define __STRING(x) #x 47 #else 48 # define __CONCAT(x,y) x/**/y 49 # define __STRING(x) "x" 50 #endif 51 52 #ifndef _ALIGN_TEXT 53 # define _ALIGN_TEXT .align 0 54 #endif 55 56 /* NB == No Binding: use .globl or .weak as necessary */ 57 #define _ENTRY_NB(x) \ 58 .text; .p2align 1; .type x,@function; x: 59 #define _ENTRY(x) .globl x; _ENTRY_NB(x) 60 61 #if defined(PROF) || defined(GPROF) 62 // XXX Profiler Support 63 #define _PROF_PROLOGUE \ 64 addi sp, sp, -16; \ 65 sd ra, 8(sp); \ 66 sd fp, 0(sp); \ 67 mv fp, sp; \ 68 call __mcount; \ 69 ld ra, 8(sp); \ 70 ld fp, 0(sp); \ 71 add sp, sp, 16; 72 #else 73 #define _PROF_PROLOGUE 74 #endif 75 76 #if defined(_RET_PROTECTOR) 77 // XXX Retguard Support 78 #error RETGUARD not yet supported for riscv64 79 #else 80 #define RETGUARD_CALC_COOKIE(reg) 81 #define RETGUARD_LOAD_RANDOM(x, reg) 82 #define RETGUARD_SETUP(x, reg) 83 #define RETGUARD_CHECK(x, reg) 84 #define RETGUARD_PUSH(reg) 85 #define RETGUARD_POP(reg) 86 #define RETGUARD_SYMBOL(x) 87 #endif 88 89 #define ENTRY(y) _ENTRY(y); _PROF_PROLOGUE 90 #define ENTRY_NP(y) _ENTRY(y) 91 #define ENTRY_NB(y) _ENTRY_NB(y); _PROF_PROLOGUE 92 #define ASENTRY(y) _ENTRY(y); _PROF_PROLOGUE 93 #define ASENTRY_NP(y) _ENTRY(y) 94 #define END(y) .size y, . - y 95 #define EENTRY(sym) .globl sym; sym: 96 #define EEND(sym) 97 98 #ifdef __PIC__ 99 #define PIC_SYM(x,y) x(y) 100 #else 101 #define PIC_SYM(x,y) x 102 #endif 103 104 #define STRONG_ALIAS(alias,sym) \ 105 .global alias; \ 106 alias = sym 107 #define WEAK_ALIAS(alias,sym) \ 108 .weak alias; \ 109 alias = sym 110 111 #define SWAP_FAULT_HANDLER(handler, tmp0, tmp1) \ 112 ld tmp0, CI_CURPCB(tp); /* Load the pcb */ \ 113 ld tmp1, PCB_ONFAULT(tmp0); /* Save old handler */ \ 114 sd handler, PCB_ONFAULT(tmp0); /* Set the handler */ \ 115 mv handler, tmp1 116 117 #define SET_FAULT_HANDLER(handler, pcb) \ 118 ld pcb, CI_CURPCB(tp); /* Load the pcb */ \ 119 sd handler, PCB_ONFAULT(pcb) /* Set the handler */ 120 121 #define ENTER_USER_ACCESS(tmp) \ 122 li tmp, SSTATUS_SUM; \ 123 csrs sstatus, tmp 124 125 #define EXIT_USER_ACCESS(tmp) \ 126 li tmp, SSTATUS_SUM; \ 127 csrc sstatus, tmp 128 129 #endif /* _MACHINE_ASM_H_ */ 130