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
HELPER(divu_i128)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
HELPER(remu_i128)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
HELPER(divs_i128)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
HELPER(rems_i128)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