1 /*
2 * QEMU TILE-Gx helpers
3 *
4 * Copyright (c) 2015 Chen Gang
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see
18 * <http://www.gnu.org/licenses/lgpl-2.1.html>
19 */
20
21 #include "qemu/osdep.h"
22 #include "cpu.h"
23 #include "exec/exec-all.h"
24 #include "exec/helper-proto.h"
25 #include <zlib.h> /* For crc32 */
26 #include "syscall_defs.h"
27
helper_exception(CPUTLGState * env,uint32_t excp)28 void helper_exception(CPUTLGState *env, uint32_t excp)
29 {
30 CPUState *cs = env_cpu(env);
31
32 cs->exception_index = excp;
33 cpu_loop_exit(cs);
34 }
35
helper_ext01_ics(CPUTLGState * env)36 void helper_ext01_ics(CPUTLGState *env)
37 {
38 uint64_t val = env->spregs[TILEGX_SPR_EX_CONTEXT_0_1];
39
40 switch (val) {
41 case 0:
42 case 1:
43 env->spregs[TILEGX_SPR_CRITICAL_SEC] = val;
44 break;
45 default:
46 #if defined(CONFIG_USER_ONLY)
47 env->signo = TARGET_SIGILL;
48 env->sigcode = TARGET_ILL_ILLOPC;
49 helper_exception(env, TILEGX_EXCP_SIGNAL);
50 #else
51 helper_exception(env, TILEGX_EXCP_OPCODE_UNIMPLEMENTED);
52 #endif
53 break;
54 }
55 }
56
helper_revbits(uint64_t arg)57 uint64_t helper_revbits(uint64_t arg)
58 {
59 return revbit64(arg);
60 }
61
62 /*
63 * Functional Description
64 * uint64_t a = rf[SrcA];
65 * uint64_t b = rf[SrcB];
66 * uint64_t d = rf[Dest];
67 * uint64_t output = 0;
68 * unsigned int counter;
69 * for (counter = 0; counter < (WORD_SIZE / BYTE_SIZE); counter++)
70 * {
71 * int sel = getByte (b, counter) & 0xf;
72 * uint8_t byte = (sel < 8) ? getByte (d, sel) : getByte (a, (sel - 8));
73 * output = setByte (output, counter, byte);
74 * }
75 * rf[Dest] = output;
76 */
helper_shufflebytes(uint64_t dest,uint64_t srca,uint64_t srcb)77 uint64_t helper_shufflebytes(uint64_t dest, uint64_t srca, uint64_t srcb)
78 {
79 uint64_t vdst = 0;
80 int count;
81
82 for (count = 0; count < 64; count += 8) {
83 uint64_t sel = srcb >> count;
84 uint64_t src = (sel & 8) ? srca : dest;
85 vdst |= extract64(src, (sel & 7) * 8, 8) << count;
86 }
87
88 return vdst;
89 }
90
helper_crc32_8(uint64_t accum,uint64_t input)91 uint64_t helper_crc32_8(uint64_t accum, uint64_t input)
92 {
93 uint8_t buf = input;
94
95 /* zlib crc32 converts the accumulator and output to one's complement. */
96 return crc32(accum ^ 0xffffffff, &buf, 1) ^ 0xffffffff;
97 }
98
helper_crc32_32(uint64_t accum,uint64_t input)99 uint64_t helper_crc32_32(uint64_t accum, uint64_t input)
100 {
101 uint8_t buf[4];
102
103 stl_le_p(buf, input);
104
105 /* zlib crc32 converts the accumulator and output to one's complement. */
106 return crc32(accum ^ 0xffffffff, buf, 4) ^ 0xffffffff;
107 }
108
helper_cmula(uint64_t srcd,uint64_t srca,uint64_t srcb)109 uint64_t helper_cmula(uint64_t srcd, uint64_t srca, uint64_t srcb)
110 {
111 uint32_t reala = (int16_t)srca;
112 uint32_t imaga = (int16_t)(srca >> 16);
113 uint32_t realb = (int16_t)srcb;
114 uint32_t imagb = (int16_t)(srcb >> 16);
115 uint32_t reald = srcd;
116 uint32_t imagd = srcd >> 32;
117 uint32_t realr = reala * realb - imaga * imagb + reald;
118 uint32_t imagr = reala * imagb + imaga * realb + imagd;
119
120 return deposit64(realr, 32, 32, imagr);
121 }
122
helper_cmulaf(uint64_t srcd,uint64_t srca,uint64_t srcb)123 uint64_t helper_cmulaf(uint64_t srcd, uint64_t srca, uint64_t srcb)
124 {
125 uint32_t reala = (int16_t)srca;
126 uint32_t imaga = (int16_t)(srca >> 16);
127 uint32_t realb = (int16_t)srcb;
128 uint32_t imagb = (int16_t)(srcb >> 16);
129 uint32_t reald = (int16_t)srcd;
130 uint32_t imagd = (int16_t)(srcd >> 16);
131 int32_t realr = reala * realb - imaga * imagb;
132 int32_t imagr = reala * imagb + imaga * realb;
133
134 return deposit32((realr >> 15) + reald, 16, 16, (imagr >> 15) + imagd);
135 }
136
helper_cmul2(uint64_t srca,uint64_t srcb,int shift,int round)137 uint64_t helper_cmul2(uint64_t srca, uint64_t srcb, int shift, int round)
138 {
139 uint32_t reala = (int16_t)srca;
140 uint32_t imaga = (int16_t)(srca >> 16);
141 uint32_t realb = (int16_t)srcb;
142 uint32_t imagb = (int16_t)(srcb >> 16);
143 int32_t realr = reala * realb - imaga * imagb + round;
144 int32_t imagr = reala * imagb + imaga * realb + round;
145
146 return deposit32(realr >> shift, 16, 16, imagr >> shift);
147 }
148