1 /* $NetBSD: reg.h,v 1.10 2022/12/13 22:25:08 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _RISCV_REG_H_ 33 #define _RISCV_REG_H_ 34 35 // x0 = 0 36 // x1 = ra (return address) Caller 37 // x2 = sp (stack pointer) Callee 38 // x3 = gp (global pointer) 39 // x4 = tp (thread pointer) 40 // x5 - x7 = t0 - t2 (temporary) Caller 41 // x8 = s0/fp (saved register / frame pointer) Callee 42 // x9 = s1 (saved register) Callee 43 // x10 - x11 = a0 - a1 (arguments/return values) Caller 44 // x12 - x17 = a2 - a7 (arguments) Caller 45 // x18 - x27 = s2 - s11 (saved registers) Callee 46 // x28 - x31 = t3 - t6 (temporaries) Caller 47 48 struct reg { // synced with register_t in <riscv/types.h> 49 #ifdef _LP64 50 __uint64_t r_reg[31]; /* x0 is always 0 */ 51 __uint64_t r_pc; 52 #else 53 __uint32_t r_reg[31]; /* x0 is always 0 */ 54 __uint32_t r_pc; 55 #endif 56 }; 57 58 #ifdef _LP64 59 struct reg32 { // synced with register_t in <riscv/types.h> 60 __uint32_t r_reg[31]; /* x0 is always 0 */ 61 __uint32_t r_pc; 62 }; 63 #endif 64 65 #define _XREG(n) ((n) - 1) 66 #define _X_RA _XREG(1) 67 #define _X_SP _XREG(2) 68 #define _X_GP _XREG(3) 69 #define _X_TP _XREG(4) 70 #define _X_T0 _XREG(5) 71 #define _X_T1 _XREG(6) 72 #define _X_T2 _XREG(7) 73 #define _X_S0 _XREG(8) 74 #define _X_S1 _XREG(9) 75 #define _X_A0 _XREG(10) 76 #define _X_A1 _XREG(11) 77 #define _X_A2 _XREG(12) 78 #define _X_A3 _XREG(13) 79 #define _X_A4 _XREG(14) 80 #define _X_A5 _XREG(15) 81 #define _X_A6 _XREG(16) 82 #define _X_A7 _XREG(17) 83 #define _X_S2 _XREG(18) 84 #define _X_S3 _XREG(19) 85 #define _X_S4 _XREG(20) 86 #define _X_S5 _XREG(21) 87 #define _X_S6 _XREG(22) 88 #define _X_S7 _XREG(23) 89 #define _X_S8 _XREG(24) 90 #define _X_S9 _XREG(25) 91 #define _X_S10 _XREG(26) 92 #define _X_S11 _XREG(27) 93 #define _X_T3 _XREG(28) 94 #define _X_T4 _XREG(29) 95 #define _X_T5 _XREG(30) 96 #define _X_T6 _XREG(31) 97 98 // f0 - f7 = ft0 - ft7 (FP temporaries) Caller 99 // following layout is similar to integer registers above 100 // f8 - f9 = fs0 - fs1 (FP saved registers) Callee 101 // f10 - f11 = fa0 - fa1 (FP arguments/return values) Caller 102 // f12 - f17 = fa2 - fa7 (FP arguments) Caller 103 // f18 - f27 = fs2 - fa11 (FP saved registers) Callee 104 // f28 - f31 = ft8 - ft11 (FP temporaries) Caller 105 106 /* 107 * This fragment is common to <riscv/mcontext.h> and <riscv/reg.h> 108 */ 109 #ifndef _BSD_FPREG_T_ 110 union __fpreg { 111 __uint64_t u_u64; 112 double u_d; 113 }; 114 #define _BSD_FPREG_T_ union __fpreg 115 #endif 116 117 /* 118 * 32 double precision floating point, 1 CSR 119 */ 120 struct fpreg { 121 _BSD_FPREG_T_ r_fpreg[33]; 122 }; 123 #define r_fcsr r_fpreg[32].u_u64 124 125 #endif /* _RISCV_REG_H_ */ 126