1 /* Disassemble ft32 instructions.
2 Copyright (C) 2013-2023 Free Software Foundation, Inc.
3 Contributed by FTDI (support@ftdichip.com)
4
5 This file is part of the GNU opcodes library.
6
7 This library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 It is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include <stdio.h>
24 #define STATIC_TABLE
25 #define DEFINE_TABLE
26
27 #include "opcode/ft32.h"
28 #include "disassemble.h"
29
30 extern const ft32_opc_info_t ft32_opc_info[128];
31
32 static fprintf_ftype fpr;
33 static void *stream;
34
35 static int
36 sign_extend (int bit, int value)
37 {
38 int onebit = (1 << bit);
39 return (value & (onebit - 1)) - (value & onebit);
40 }
41
42 static void
43 ft32_opcode1 (unsigned int iword,
44 struct disassemble_info *info)
45 {
46 const ft32_opc_info_t *oo;
47
48 for (oo = ft32_opc_info; oo->name; oo++)
49 if ((iword & oo->mask) == oo->bits)
50 break;
51
52 if (oo->name)
53 {
54 int f = oo->fields;
55 int imm;
56
57 fpr (stream, "%s", oo->name);
58 if (oo->dw)
59 fpr (stream, ".%c ", "bsl"[(iword >> FT32_FLD_DW_BIT) & 3]);
60 else
61 fpr (stream, " ");
62
63 while (f)
64 {
65 int lobit = f & -f;
66 if (f & lobit)
67 {
68 switch (lobit)
69 {
70 case FT32_FLD_CBCRCV:
71 /* imm is {CB, CV} */
72 imm = ((iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1)) << 4;
73 imm |= ((iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1));
74 switch (imm)
75 {
76 case 0x00: fpr (stream, "nz"); break;
77 case 0x01: fpr (stream, "z"); break;
78 case 0x10: fpr (stream, "ae"); break;
79 case 0x11: fpr (stream, "b"); break;
80 case 0x20: fpr (stream, "no"); break;
81 case 0x21: fpr (stream, "o"); break;
82 case 0x30: fpr (stream, "ns"); break;
83 case 0x31: fpr (stream, "s"); break;
84 case 0x40: fpr (stream, "lt"); break;
85 case 0x41: fpr (stream, "gte"); break;
86 case 0x50: fpr (stream, "lte"); break;
87 case 0x51: fpr (stream, "gt"); break;
88 case 0x60: fpr (stream, "be"); break;
89 case 0x61: fpr (stream, "a"); break;
90 default:
91 fpr (stream, "%d,$r30,%d", (imm >> 4), (imm & 1));
92 break;
93 }
94 break;
95 case FT32_FLD_CB:
96 imm = (iword >> FT32_FLD_CB_BIT) & ((1 << FT32_FLD_CB_SIZ) - 1);
97 fpr (stream, "%d", imm);
98 break;
99 case FT32_FLD_R_D:
100 fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
101 break;
102 case FT32_FLD_CR:
103 imm = (iword >> FT32_FLD_CR_BIT) & ((1 << FT32_FLD_CR_SIZ) - 1);
104 fpr (stream, "$r%d", 28 + imm);
105 break;
106 case FT32_FLD_CV:
107 imm = (iword >> FT32_FLD_CV_BIT) & ((1 << FT32_FLD_CV_SIZ) - 1);
108 fpr (stream, "%d", imm);
109 break;
110 case FT32_FLD_R_1:
111 fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
112 break;
113 case FT32_FLD_RIMM:
114 imm = (iword >> FT32_FLD_RIMM_BIT) & ((1 << FT32_FLD_RIMM_SIZ) - 1);
115 if (imm & 0x400)
116 fpr (stream, "%d", sign_extend (9, imm));
117 else
118 fpr (stream, "$r%d", imm & 0x1f);
119 break;
120 case FT32_FLD_R_2:
121 fpr (stream, "$r%d", (iword >> FT32_FLD_R_2_BIT) & 0x1f);
122 break;
123 case FT32_FLD_K20:
124 imm = iword & ((1 << FT32_FLD_K20_SIZ) - 1);
125 fpr (stream, "%d", sign_extend (19, imm));
126 break;
127 case FT32_FLD_PA:
128 imm = (iword & ((1 << FT32_FLD_PA_SIZ) - 1)) << 2;
129 info->print_address_func ((bfd_vma) imm, info);
130 break;
131 case FT32_FLD_AA:
132 imm = iword & ((1 << FT32_FLD_AA_SIZ) - 1);
133 info->print_address_func ((1 << 23) | (bfd_vma) imm, info);
134 break;
135 case FT32_FLD_K16:
136 imm = iword & ((1 << FT32_FLD_K16_SIZ) - 1);
137 fpr (stream, "%d", imm);
138 break;
139 case FT32_FLD_K15:
140 imm = iword & ((1 << FT32_FLD_K15_SIZ) - 1);
141 fpr (stream, "%d", sign_extend (14, imm));
142 break;
143 case FT32_FLD_R_D_POST:
144 fpr (stream, "$r%d", (iword >> FT32_FLD_R_D_BIT) & 0x1f);
145 break;
146 case FT32_FLD_R_1_POST:
147 fpr (stream, "$r%d", (iword >> FT32_FLD_R_1_BIT) & 0x1f);
148 break;
149 default:
150 break;
151 }
152 f &= ~lobit;
153 if (f)
154 fpr (stream, ",");
155 }
156 }
157 }
158 else
159 fpr (stream, "!");
160 }
161
162 static void
163 ft32_opcode (bfd_vma addr ATTRIBUTE_UNUSED,
164 unsigned int iword,
165 struct disassemble_info *info)
166 {
167 unsigned int sc[2];
168 if (ft32_decode_shortcode ((unsigned int) addr, iword, sc))
169 {
170 ft32_opcode1 (sc[0], info);
171 fpr (stream, " ; ");
172 ft32_opcode1 (sc[1], info);
173 }
174 else
175 ft32_opcode1 (iword, info);
176 }
177
178 int
179 print_insn_ft32 (bfd_vma addr, struct disassemble_info *info)
180 {
181 int status;
182 stream = info->stream;
183 bfd_byte buffer[4];
184 unsigned int iword;
185
186 fpr = info->fprintf_func;
187
188 if ((status = info->read_memory_func (addr, buffer, 4, info)))
189 goto fail;
190
191 iword = bfd_getl32 (buffer);
192
193 fpr (stream, "%08x ", iword);
194
195 ft32_opcode (addr, iword, info);
196
197 return 4;
198
199 fail:
200 info->memory_error_func (status, addr, info);
201 return -1;
202 }