1 /* 2 * RISC-V Emulation Helpers for QEMU. 3 * 4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu 5 * Copyright (c) 2017-2018 SiFive, Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2 or later, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "cpu.h" 22 #include "exec/exec-all.h" 23 #include "exec/helper-proto.h" 24 25 target_ulong HELPER(divu_i128)(CPURISCVState *env, 26 target_ulong ul, target_ulong uh, 27 target_ulong vl, target_ulong vh) 28 { 29 target_ulong ql, qh; 30 Int128 q; 31 32 if (vl == 0 && vh == 0) { /* Handle special behavior on div by zero */ 33 ql = ~0x0; 34 qh = ~0x0; 35 } else { 36 q = int128_divu(int128_make128(ul, uh), int128_make128(vl, vh)); 37 ql = int128_getlo(q); 38 qh = int128_gethi(q); 39 } 40 41 env->retxh = qh; 42 return ql; 43 } 44 45 target_ulong HELPER(remu_i128)(CPURISCVState *env, 46 target_ulong ul, target_ulong uh, 47 target_ulong vl, target_ulong vh) 48 { 49 target_ulong rl, rh; 50 Int128 r; 51 52 if (vl == 0 && vh == 0) { 53 rl = ul; 54 rh = uh; 55 } else { 56 r = int128_remu(int128_make128(ul, uh), int128_make128(vl, vh)); 57 rl = int128_getlo(r); 58 rh = int128_gethi(r); 59 } 60 61 env->retxh = rh; 62 return rl; 63 } 64 65 target_ulong HELPER(divs_i128)(CPURISCVState *env, 66 target_ulong ul, target_ulong uh, 67 target_ulong vl, target_ulong vh) 68 { 69 target_ulong qh, ql; 70 Int128 q; 71 72 if (vl == 0 && vh == 0) { /* Div by zero check */ 73 ql = ~0x0; 74 qh = ~0x0; 75 } else if (uh == (1ULL << (TARGET_LONG_BITS - 1)) && ul == 0 && 76 vh == ~0x0 && vl == ~0x0) { 77 /* Signed div overflow check (-2**127 / -1) */ 78 ql = ul; 79 qh = uh; 80 } else { 81 q = int128_divs(int128_make128(ul, uh), int128_make128(vl, vh)); 82 ql = int128_getlo(q); 83 qh = int128_gethi(q); 84 } 85 86 env->retxh = qh; 87 return ql; 88 } 89 90 target_ulong HELPER(rems_i128)(CPURISCVState *env, 91 target_ulong ul, target_ulong uh, 92 target_ulong vl, target_ulong vh) 93 { 94 target_ulong rh, rl; 95 Int128 r; 96 97 if (vl == 0 && vh == 0) { 98 rl = ul; 99 rh = uh; 100 } else { 101 r = int128_rems(int128_make128(ul, uh), int128_make128(vl, vh)); 102 rl = int128_getlo(r); 103 rh = int128_gethi(r); 104 } 105 106 env->retxh = rh; 107 return rl; 108 } 109