include/opcode/ft32.h

   1 /* Definitions for decoding the ft32 opcode table.
   2    Copyright (C) 2013-2021 Free Software Foundation, Inc.
   3    Contributed by FTDI (support@ftdichip.com)
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  18 02110-1301, USA.  */
  19
  20 typedef struct ft32_opc_info_t
  21 {
  22   const char *name;
  23   int dw;
  24   unsigned int mask;
  25   unsigned int bits;
  26   int fields;
  27 } ft32_opc_info_t;
  28
  29 #define FT32_PAT_ALUOP    0x08
  30 #define FT32_PAT_LDA      0x18
  31 #define FT32_PAT_TOCI     0x01
  32 #define FT32_PAT_CMPOP    0x0b
  33 #define FT32_PAT_STA      0x17
  34 #define FT32_PAT_EXA      0x07
  35 #define FT32_PAT_LDK      0x0c
  36 #define FT32_PAT_FFUOP    0x1e
  37 #define FT32_PAT_LDI      0x15
  38 #define FT32_PAT_STI      0x16
  39 #define FT32_PAT_EXI      0x1d
  40 #define FT32_PAT_POP      0x11
  41 #define FT32_PAT_LPM      0x0d
  42 #define FT32_PAT_LINK     0x12
  43 #define FT32_PAT_TOC      0x00
  44 #define FT32_PAT_PUSH     0x10
  45 #define FT32_PAT_RETURN   0x14
  46 #define FT32_PAT_UNLINK   0x13
  47 #define FT32_PAT_LPMI     0x19
  48
  49 #define FT32_FLD_CBCRCV (1 << 0)
  50 #define FT32_FLD_INT (1 << 1)
  51 #define FT32_FLD_INT_BIT 26
  52 #define FT32_FLD_INT_SIZ 1
  53 #define FT32_FLD_DW (1 << 2)
  54 #define FT32_FLD_DW_BIT 25
  55 #define FT32_FLD_DW_SIZ 2
  56 #define FT32_FLD_CB (1 << 3)
  57 #define FT32_FLD_CB_BIT 22
  58 #define FT32_FLD_CB_SIZ 5
  59 #define FT32_FLD_R_D (1 << 4)
  60 #define FT32_FLD_R_D_BIT 20
  61 #define FT32_FLD_R_D_SIZ 5
  62 #define FT32_FLD_CR (1 << 5)
  63 #define FT32_FLD_CR_BIT 20
  64 #define FT32_FLD_CR_SIZ 2
  65 #define FT32_FLD_CV (1 << 6)
  66 #define FT32_FLD_CV_BIT 19
  67 #define FT32_FLD_CV_SIZ 1
  68 #define FT32_FLD_BT (1 << 7)
  69 #define FT32_FLD_BT_BIT 18
  70 #define FT32_FLD_BT_SIZ 1
  71 #define FT32_FLD_R_1 (1 << 8)
  72 #define FT32_FLD_R_1_BIT 15
  73 #define FT32_FLD_R_1_SIZ 5
  74 #define FT32_FLD_RIMM (1 << 9)
  75 #define FT32_FLD_RIMM_BIT 4
  76 #define FT32_FLD_RIMM_SIZ 11
  77 #define FT32_FLD_R_2 (1 << 10)
  78 #define FT32_FLD_R_2_BIT 4
  79 #define FT32_FLD_R_2_SIZ 5
  80 #define FT32_FLD_K20 (1 << 11)
  81 #define FT32_FLD_K20_BIT 0
  82 #define FT32_FLD_K20_SIZ 20
  83 #define FT32_FLD_PA (1 << 12)
  84 #define FT32_FLD_PA_BIT 0
  85 #define FT32_FLD_PA_SIZ 18
  86 #define FT32_FLD_AA (1 << 13)
  87 #define FT32_FLD_AA_BIT 0
  88 #define FT32_FLD_AA_SIZ 17
  89 #define FT32_FLD_K16 (1 << 14)
  90 #define FT32_FLD_K16_BIT 0
  91 #define FT32_FLD_K16_SIZ 16
  92 #define FT32_FLD_K15 (1 << 15)
  93 #define FT32_FLD_K15_BIT 0
  94 #define FT32_FLD_K15_SIZ 15
  95 #define FT32_FLD_AL (1 << 16)
  96 #define FT32_FLD_AL_BIT 0
  97 #define FT32_FLD_AL_SIZ 4
  98
  99 #define FT32_IS_CALL(inst)   (((inst) & 0xfffc0000) == 0x00340000)
 100 #define FT32_IS_PUSH(inst)   (((inst) & 0xfff00000) == 0x84000000)
 101 #define FT32_PUSH_REG(inst)  (((inst) >> 15) & 0x1f)
 102 #define FT32_IS_LINK(inst)   (((inst) & 0xffff0000) == 0x95d00000)
 103 #define FT32_LINK_SIZE(inst) ((inst) & 0xffff)
 104
 105 #define FT32_FLD_R_D_POST (1 << 17)
 106 #define FT32_FLD_R_1_POST (1 << 18)
 107
 108 static const unsigned int sc_form_0[] = {
 109 0x44000000, 0x44000002, 0x44000004, 0x44000005, 0x4400000b,
 110 0x44000010, 0x44000012, 0x44000014, 0x44000015, 0x44000018,
 111 0x4400001b, 0x44000020, 0x44000022, 0x44000024, 0x44000025,
 112 0x4400002b, 0x44000030, 0x44000032, 0x44000034, 0x44000035,
 113 0x4400003b, 0x44000040, 0x44000042, 0x44000044, 0x44000045,
 114 0x4400004b, 0x44000050, 0x44000060, 0x44000062, 0x44000065,
 115 0x44000070, 0x44000072, 0x44000075, 0x44000080, 0x44000082,
 116 0x44000090, 0x44000092, 0x440000a0, 0x440000a2, 0x440000b0,
 117 0x440000d0, 0x440000d2, 0x440000d5, 0x440000e0, 0x440000e2,
 118 0x440000f0, 0x440000f2, 0x440000f5, 0x44000100, 0x44000102,
 119 0x44000110, 0x44000120, 0x44000122, 0x44000130, 0x44000140,
 120 0x44000170, 0x44000180, 0x44000190, 0x440001a0, 0x440001b0,
 121 0x440001e0, 0x440001f0, 0x44004000, 0x44004003, 0x4400400c,
 122 0x4400400d, 0x44004010, 0x44004011, 0x44004013, 0x44004014,
 123 0x44004016, 0x44004019, 0x4400401a, 0x44004020, 0x44004021,
 124 0x44004028, 0x4400402a, 0x44004034, 0x44004038, 0x44004039,
 125 0x44004040, 0x44004048, 0x44004058, 0x44004064, 0x44004074,
 126 0x44004080, 0x44004081, 0x44004088, 0x44004089, 0x44004098,
 127 0x440040c0, 0x440040ca, 0x440040f4, 0x44004100, 0x44004108,
 128 0x44004109, 0x4400410a, 0x4400410b, 0x44004180, 0x44004182,
 129 0x440041c0, 0x440041c2, 0x440041f4, 0x44004200, 0x44004202,
 130 0x4400420b, 0x4400421b, 0x4400422b, 0x44004240, 0x44004242,
 131 0x4400424b, 0x4400425b, 0x4400426b, 0x4400427b, 0x44004280,
 132 0x44004282, 0x440042ab, 0x440042bb, 0x440042c0, 0x440042c2,
 133 0x44004300, 0x44004340, 0x440043c3, 0x4400440b, 0x44004543,
 134 0x44004553, 0x440047f4, 0x44004800, 0x44004980, 0x44004a0b,
 135 0x44004a80, 0x44004dc0, 0x44004ff4, 0x44005003, 0x44005353,
 136 0x4400537b, 0x440053e3, 0x44005700, 0x4400594b, 0x4400620b,
 137 0x4400621b, 0x4400622b, 0x4400623b, 0x4400624b, 0x4400625b,
 138 0x4400626b, 0x4400627b, 0x4400628b, 0x4400629b, 0x440062bb,
 139 0x440062fb, 0x4400633b, 0x4400637b, 0x44006383, 0x44007f00,
 140 0x44007f80, 0x44007fc0, 0x44007fe0, 0x44007ff0, 0x44007ff3, 0x44007ff6
 141 };
 142 static const unsigned int sc_form_1[] = {
 143 0x44000002, 0x44008002, 0x44010002, 0x44010008, 0x44018002,
 144 0x44020002, 0x44030002, 0x44038002
 145 };
 146 static const unsigned int sc_form_2[] = {
 147 0x59e04002, 0x59e04012, 0x59e04022, 0x59e04032, 0x59e04042,
 148 0x59e04052, 0x59e04072, 0x59e04082, 0x59e07ff2, 0x5de00002,
 149 0x5de00012, 0x5de00022, 0x5de00032, 0x5de00042, 0x5de00052,
 150 0x5de00062, 0x5de00072, 0x5de00082, 0x5de000a2, 0x5de000d2,
 151 0x5de000e2, 0x5de000f2, 0x5de00102, 0x5de00112, 0x5de00122,
 152 0x5de00132, 0x5de00172, 0x5de04002, 0x5de04012, 0x5de04022,
 153 0x5de04032, 0x5de04042, 0x5de04052, 0x5de04062, 0x5de04072,
 154 0x5de04082, 0x5de04092, 0x5de040f2, 0x5de04102, 0x5de04112,
 155 0x5de04142, 0x5de04162, 0x5de041b2, 0x5de041f2, 0x5de04202,
 156 0x5de0420c, 0x5de0421c, 0x5de0422c, 0x5de0423c, 0x5de04242,
 157 0x5de0424c, 0x5de0425c, 0x5de0426c, 0x5de0427c, 0x5de0428c,
 158 0x5de0429c, 0x5de042ac, 0x5de042cc, 0x5de042dc, 0x5de042ec,
 159 0x5de042fc, 0x5de0430c, 0x5de0431c, 0x5de0433c, 0x5de0436c,
 160 0x5de0437c, 0x5de04382, 0x5de043ac, 0x5de043bc, 0x5de043cc,
 161 0x5de043dc, 0x5de04ff2, 0x5de07ff2, 0x84000000
 162 };
 163 static const unsigned int sc_form_3[] = {
 164 0x44000010, 0x44000024, 0x44000025, 0x44000030, 0x44000034,
 165 0x44004000, 0x4400400c, 0x4400400d, 0x44004010, 0x44004014,
 166 0x44004028, 0x44004038, 0x44004040, 0x440040ca, 0x44004109,
 167 0x44004880, 0x44004ac0, 0x44004e00, 0x44004e80, 0x44004ff4,
 168 0x4400500c, 0x44005200, 0x44005680, 0x44005700, 0x4400620b,
 169 0x44007f80, 0x44008020, 0x44008024, 0x4400c000, 0x4400c00c,
 170 0x4400c00d, 0x4400c010, 0x4400c028, 0x4400c038, 0x4400c1f9,
 171 0x4400cff4, 0x4400d00c, 0x4400d173, 0x4400ff80, 0x4400fff0,
 172 0x44010030, 0x44014000, 0x4401400c, 0x4401400d, 0x44014010,
 173 0x44014028, 0x44014074, 0x44014080, 0x440143f3, 0x44014ff4,
 174 0x4401500c, 0x44015743, 0x44017ff0, 0x44018030, 0x4401c000,
 175 0x4401c00c, 0x4401c010, 0x4401cff4, 0x4401d00c, 0x44020100,
 176 0x44024000, 0x44024014, 0x44027f80, 0x4402c000, 0x44030085,
 177 0x44034000, 0x44034109, 0x4403c000, 0x44044000, 0x44044109,
 178 0x4404410b, 0x4404c000, 0x440680e0, 0x4406c000, 0x4406c040,
 179 0x4406c080, 0x4406c0c0, 0x4406c300, 0x4406c3c0, 0x4406c900,
 180 0x4406cac0, 0x4406cb40, 0x4406cbc0, 0x4406ce80, 0x4406d5c0,
 181 0x4406d680, 0x4406d700, 0x4406d740, 0x4406d780, 0x4406dfc0,
 182 0x44074000, 0x44074010, 0x44074e80, 0x4407c000, 0x4407c00d,
 183 0x4407c074, 0x44084000, 0x4408c000, 0x44094000, 0x4409c000,
 184 0x440a4000, 0x440ac000, 0x440b4000, 0x440bc000, 0x440c4000,
 185 0x440c4040, 0x440cc000, 0x440d4000, 0x440dc000, 0x440ef340,
 186 0x440ef400, 0x440ef440, 0x440ef4c0, 0x440ef540, 0x440ef5c0,
 187 0x440ef6b0, 0x440ef700, 0x440ef780, 0x440ef8c0, 0x440f420d,
 188 0x440f421d, 0x440f426d, 0x440fc180, 0x440fc1a0, 0x440fc1b0,
 189 0x440fc1c0, 0x440fc200, 0x440fc240, 0x440fc280, 0x440fc380,
 190 0x440fc840, 0x440fc8c0, 0x440fc900, 0x440fc980, 0x440fcd80,
 191 0x64000000, 0x64000001, 0x64000002, 0x64000003, 0x64000004,
 192 0x64000005, 0x64000006, 0x64000007, 0x64000008, 0x64000009,
 193 0x6400000a, 0x6400000b, 0x6400000c, 0x6400000d, 0x6400000e,
 194 0x6400000f, 0x64000010, 0x64000011, 0x64000012, 0x64000013,
 195 0x64000014, 0x64000015, 0x64000017, 0x64000018, 0x64000019,
 196 0x6400001a, 0x6400001d, 0x64000020, 0x64000023, 0x64000024,
 197 0x64000027, 0x6400002b, 0x6400002c, 0x6400002d, 0x64000030,
 198 0x64000035, 0x6400003c, 0x64000040, 0x64000048, 0x64000064,
 199 0x6400006c, 0x64000080, 0x640000ff, 0x64000100, 0x640001b0,
 200 0x640001b8, 0x64000200, 0x64000218, 0x64000240, 0x6400024c,
 201 0x64000250, 0x640003e8, 0x64000400, 0x64000409, 0x64000554,
 202 0x64000600, 0x64000690, 0x64000730, 0x640007ff, 0x64000800,
 203 0x64000900, 0x64000fff, 0x64001000, 0x6400182c, 0x64001b70,
 204 0x64001c1c, 0x64001c24, 0x64001fff, 0x64002000, 0x64003598,
 205 0x640036ec, 0x64003fff, 0x640052c0, 0x640054e4, 0x64005a3c,
 206 0x64005fa4, 0x64006468, 0x64006718, 0x64008000, 0x6400c000,
 207 0x6400ffff, 0x64010000, 0x64010008, 0x640102a0, 0x64014515,
 208 0x64040000, 0x64050000, 0x6407c000, 0x640ff800, 0x640ffc00,
 209 0x640ffc01, 0x640ffc02, 0x640fffff, 0x8c000000, 0x94000000,
 210 0x94000018, 0x9400001c, 0x94000020, 0x98000000, 0xa0000000,
 211 0xa8000000, 0xa8000001, 0xa8000002, 0xa8000003, 0xa8008000,
 212 0xa8008002, 0xa8010000, 0xa8018000, 0xa8020000, 0xa8068000,
 213 0xa8068005, 0xa8068006, 0xa8068007, 0xa806800f, 0xa8068040,
 214 0xa8068043, 0xa8068054, 0xa8070000, 0xa8078000, 0xa8080000,
 215 0xa8090000, 0xa80b0000, 0xa80f801b, 0xaa000000, 0xaa008000,
 216 0xaa008002, 0xaa00800c, 0xaa010000, 0xaa068000, 0xaa068002,
 217 0xaa068004, 0xaa068006, 0xaa068008, 0xaa06800a, 0xaa06800c,
 218 0xaa068024, 0xaa070000, 0xaa070002, 0xaa07000c, 0xaa078000,
 219 0xaa078002, 0xac000000, 0xac000004, 0xac000008, 0xac00000c,
 220 0xac000010, 0xac000014, 0xac000018, 0xac00001c, 0xac000020,
 221 0xac000024, 0xac000028, 0xac00002c, 0xac000030, 0xac000038,
 222 0xac00003c, 0xac000040, 0xac000044, 0xac000058, 0xac00006c,
 223 0xac008000, 0xac008004, 0xac008008, 0xac00800c, 0xac008010,
 224 0xac008018, 0xac008020, 0xac008024, 0xac008028, 0xac008030,
 225 0xac008034, 0xac008038, 0xac00803c, 0xac008044, 0xac008070,
 226 0xac008078, 0xac010000, 0xac010004, 0xac010008, 0xac01000c,
 227 0xac010010, 0xac01002c, 0xac018000, 0xac018004, 0xac018008,
 228 0xac020000, 0xac020004, 0xac020008, 0xac028000, 0xac030000,
 229 0xac038000, 0xac048000, 0xac050000, 0xac068000, 0xac068004,
 230 0xac068008, 0xac06800c, 0xac068010, 0xac068014, 0xac068018,
 231 0xac06801c, 0xac068020, 0xac068024, 0xac068028, 0xac06802c,
 232 0xac068030, 0xac068034, 0xac068038, 0xac06803c, 0xac068040,
 233 0xac068044, 0xac068048, 0xac06804c, 0xac068050, 0xac068058,
 234 0xac070000, 0xac070004, 0xac070008, 0xac07000c, 0xac070010,
 235 0xac070014, 0xac070018, 0xac07001c, 0xac070024, 0xac070028,
 236 0xac07002c, 0xac070038, 0xac07003c, 0xac070040, 0xac070044,
 237 0xac070048, 0xac07004c, 0xac070054, 0xac078000, 0xac078004,
 238 0xac078008, 0xac07800c, 0xac078024, 0xac07803c, 0xac080000,
 239 0xac080004, 0xac080008, 0xac08003c, 0xac088000, 0xac088004,
 240 0xac088008, 0xac08800c, 0xac090000, 0xac098000, 0xac0a0000,
 241 0xac0a0004, 0xac0a8000, 0xac0b0000, 0xac0c0000, 0xac0d8004,
 242 0xac0d8008, 0xac0e8090, 0xac0e8094, 0xac0e80fc, 0xac0f8018,
 243 0xac0f801c, 0xac0f8020, 0xac0f8024, 0xac0f8028, 0xac0f802c,
 244 0xac0f8030, 0xac0f8034, 0xac0f8038, 0xac0f803c, 0xac0f8040,
 245 0xac0f8044, 0xac0f8048, 0xac0f804c, 0xac0f8050, 0xac0f8054,
 246 0xac0f8058, 0xb0000000, 0xb0000006, 0xb0000009, 0xb0000018,
 247 0xb0000019, 0xb000001b, 0xb0008000, 0xb0010000, 0xb0018000,
 248 0xb0018087, 0xb0020000, 0xb0030000, 0xb0070000, 0xb0078000,
 249 0xb0080000, 0xb2000000, 0xb2000006, 0xb200000c, 0xb2008000,
 250 0xb200800c, 0xb2010000, 0xb2018000, 0xb2020000, 0xb2078000,
 251 0xb4000000, 0xb4000004, 0xb4000008, 0xb400000c, 0xb4000010,
 252 0xb4000014, 0xb4000018, 0xb400001c, 0xb4000020, 0xb4000024,
 253 0xb4000028, 0xb400002c, 0xb4000030, 0xb4000034, 0xb4000038,
 254 0xb400003c, 0xb4000040, 0xb4000044, 0xb4000048, 0xb4000050,
 255 0xb4000054, 0xb400006c, 0xb4008000, 0xb4008004, 0xb4008008,
 256 0xb400800c, 0xb4008010, 0xb4008014, 0xb4008018, 0xb400801c,
 257 0xb4008020, 0xb4008024, 0xb4008028, 0xb400802c, 0xb4008034,
 258 0xb4008038, 0xb4008040, 0xb4008044, 0xb400806c, 0xb4008070,
 259 0xb4010000, 0xb4010004, 0xb4010008, 0xb401000c, 0xb4010010,
 260 0xb4010018, 0xb401001c, 0xb4010020, 0xb4010024, 0xb4010028,
 261 0xb401002c, 0xb4018000, 0xb4018004, 0xb4018008, 0xb4018018,
 262 0xb401801c, 0xb4020000, 0xb4020004, 0xb4020008, 0xb402000c,
 263 0xb4020018, 0xb4028000, 0xb4028018, 0xb4030000, 0xb4030008,
 264 0xb4030018, 0xb4038000, 0xb4068000, 0xb4068004, 0xb4068008,
 265 0xb406800c, 0xb4068018, 0xb406801c, 0xb4068020, 0xb4068024,
 266 0xb4068028, 0xb4070000, 0xb4070004, 0xb4070008, 0xb4070010,
 267 0xb4070018, 0xb4070024, 0xb4070028, 0xb4078000, 0xb4078024,
 268 0xb4080000, 0xb4080004, 0xb4090000, 0xb4098000, 0xb40c8000
 269 };
 270
 271 #define N_SC_FORM0  (sizeof (sc_form_0) / sizeof (unsigned int))
 272 #define N_SC_FORM1  (sizeof (sc_form_1) / sizeof (unsigned int))
 273 #define N_SC_FORM2  (sizeof (sc_form_2) / sizeof (unsigned int))
 274 #define N_SC_FORM3  (sizeof (sc_form_3) / sizeof (unsigned int))
 275
 276 static int
 277 sc_compar (const void *va, const void *vb)
 278 {
 279   const unsigned int *a = (unsigned int *) va;
 280   const unsigned int *b = (unsigned int *) vb;
 281   return (*a - *b);
 282 }
 283
 284 static int ATTRIBUTE_UNUSED
 285 ft32_shortcode (unsigned int op32, unsigned int *sc)
 286 {
 287   unsigned int Rd_mask = 31 << 20;
 288   unsigned int R1_mask = 31 << 15;
 289   unsigned int R2_mask = 2047 << 4;
 290   unsigned int Rd = (op32 >> 20) & 31;
 291   unsigned int R1 = (op32 >> 15) & 31;
 292   unsigned int R2 = (op32 >> 4) & 2047;
 293   unsigned int lookup;
 294   unsigned int *find = NULL;
 295   unsigned int code = 0, r = 0;
 296
 297   /* Form 0 */
 298   if (Rd == R1)
 299     {
 300       lookup = op32 & ~Rd_mask & ~R1_mask;
 301       find = (unsigned int *) bsearch (&lookup, sc_form_0, N_SC_FORM0,
 302                                        sizeof (unsigned int), sc_compar);
 303       code = find - sc_form_0;
 304       r = Rd;
 305     }
 306
 307   /* Form 1 */
 308   if ((find == NULL) && (Rd == R2))
 309     {
 310       lookup = op32 & ~Rd_mask & ~R2_mask;
 311       find = (unsigned int *) bsearch (&lookup, sc_form_1, N_SC_FORM1,
 312                                        sizeof (unsigned int), sc_compar);
 313       code = find - sc_form_1 + N_SC_FORM0;
 314       r = Rd;
 315     }
 316
 317   /* Form 2 */
 318   if (find == NULL)
 319     {
 320       lookup = op32 & ~R1_mask;
 321       find = (unsigned int *) bsearch (&lookup, sc_form_2, N_SC_FORM2,
 322                                        sizeof (unsigned int), sc_compar);
 323       code = find - sc_form_2 + (N_SC_FORM0 + N_SC_FORM1);
 324       r = R1;
 325     }
 326
 327   /* Form 3 */
 328   if (find == NULL)
 329     {
 330       lookup = op32 & ~Rd_mask;
 331       find = (unsigned int *) bsearch (&lookup, sc_form_3, N_SC_FORM3,
 332                                        sizeof (unsigned int), sc_compar);
 333       code = find - sc_form_3 + (N_SC_FORM0 + N_SC_FORM1 + N_SC_FORM2);
 334       r = Rd;
 335     }
 336
 337   *sc = (code << 5) | r;
 338
 339   return (find != NULL);
 340 }
 341
 342 static int ATTRIBUTE_UNUSED
 343 ft32_split_shortcode (unsigned int op32, unsigned int code15[2])
 344 {
 345   int code3;
 346   unsigned int code30;
 347
 348   switch (op32 >> 27)
 349     {
 350     case 2:
 351       code3 = 0;
 352       break;
 353     case 3:
 354       code3 = 1;
 355       break;
 356     case 4:
 357       code3 = 2;
 358       break;
 359     case 5:
 360       code3 = 3;
 361       break;
 362     case 6:
 363       code3 = 4;
 364       break;
 365     case 9:
 366       code3 = 5;
 367       break;
 368     case 10:
 369       code3 = 6;
 370       break;
 371     case 14:
 372       code3 = 7;
 373       break;
 374     default:
 375       code3 = -1;
 376       break;
 377     }
 378
 379   if (code3 == -1)
 380     {
 381       code15[0] = 0;
 382       code15[1] = 0;
 383       return 0;
 384     }
 385   else
 386     {
 387       code30 = ((op32 & 0x07ffffff) << 3) | code3;
 388       code15[0] = code30 & 0x7fff;
 389       code15[1] = (code30 >> 15) & 0x7fff;
 390       return 1;
 391     }
 392 }
 393
 394 static unsigned int ATTRIBUTE_UNUSED
 395 ft32_merge_shortcode (unsigned int code15[2])
 396 {
 397   static const unsigned char pat3[] = { 2, 3, 4, 5, 6, 9, 10, 14 };
 398
 399   unsigned int code30 = (code15[1] << 15) | code15[0];
 400   unsigned int code27 = code30 >> 3;
 401   unsigned int code3 = code30 & 7;
 402   unsigned int pattern = pat3[code3];
 403   return (pattern << 27) | code27;
 404 }
 405
 406 static int ATTRIBUTE_UNUSED
 407 ft32_decode_shortcode (unsigned int pc, unsigned int op32, unsigned int *sc)
 408 {
 409   int code3;
 410   unsigned int code30;
 411   unsigned int code15[2];
 412   size_t i;
 413
 414   switch (op32 >> 27)
 415     {
 416     case 2:
 417       code3 = 0;
 418       break;
 419     case 3:
 420       code3 = 1;
 421       break;
 422     case 4:
 423       code3 = 2;
 424       break;
 425     case 5:
 426       code3 = 3;
 427       break;
 428     case 6:
 429       code3 = 4;
 430       break;
 431     case 9:
 432       code3 = 5;
 433       break;
 434     case 10:
 435       code3 = 6;
 436       break;
 437     case 14:
 438       code3 = 7;
 439       break;
 440     default:
 441       code3 = -1;
 442       break;
 443     }
 444
 445   if (code3 == -1)
 446     return 0;
 447   else
 448     {
 449       code30 = ((op32 & 0x07ffffff) << 3) | code3;
 450       code15[0] = code30 & 0x7fff;
 451       code15[1] = (code30 >> 15) & 0x7fff;
 452       for (i = 0; i < 2; i++)
 453         {
 454           unsigned int code = code15[i] >> 5;
 455           unsigned int r = code15[i] & 0x1f;
 456
 457           if (code < 768)
 458             {
 459               if (code < N_SC_FORM0)
 460                 sc[i] = sc_form_0[code] | (r << 20) | (r << 15);
 461               else if (code < (N_SC_FORM0 + N_SC_FORM1))
 462                 sc[i] = sc_form_1[code - N_SC_FORM0] | (r << 20) | (r << 4);
 463               else if (code < (N_SC_FORM0 + N_SC_FORM1 + N_SC_FORM2))
 464                 sc[i] = sc_form_2[code - (N_SC_FORM0 + N_SC_FORM1)]
 465                   | (r << 15);
 466               else
 467                 sc[i] = sc_form_3[code -
 468                                   (N_SC_FORM0 + N_SC_FORM1 + N_SC_FORM2)]
 469                   | (r << 20);
 470             }
 471           else
 472             {
 473               int jtype = (code15[i] >> 9) & 15;
 474               int offset = code15[i] & 511;
 475               if (offset & 256)
 476                 offset -= 512;
 477               if (jtype < 14)
 478                 sc[i] =
 479                   0x00200000 | ((jtype >> 1) << 22) | ((jtype & 1) << 19);
 480               else if (jtype == 14)
 481                 sc[i] = 0x00300000;
 482               else
 483                 sc[i] = 0x00340000;
 484               sc[i] |= ((pc >> 2) + offset);
 485             }
 486         }
 487       return 1;
 488     }
 489 }