| 1 | /* Instruction printing code for the OpenRISC 1000 |
| 2 | Copyright (C) 2002-2014 Free Software Foundation, Inc. |
| 3 | Contributed by Damjan Lampret <lampret@opencores.org>. |
| 4 | Modified from a29k port. |
| 5 | |
| 6 | This file is part of the GNU opcodes library. |
| 7 | |
| 8 | This library is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | It is distributed in the hope that it will be useful, but WITHOUT |
| 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| 16 | License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #ifndef DEBUG |
| 24 | #define DEBUG 0 |
| 25 | #endif |
| 26 | |
| 27 | #include "sysdep.h" |
| 28 | #include "dis-asm.h" |
| 29 | #include "opcode/or32.h" |
| 30 | #include "safe-ctype.h" |
| 31 | |
| 32 | #define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x))) |
| 33 | |
| 34 | /* Now find the four bytes of INSN_CH and put them in *INSN. */ |
| 35 | |
| 36 | static void |
| 37 | find_bytes_big (unsigned char *insn_ch, unsigned long *insn) |
| 38 | { |
| 39 | *insn = |
| 40 | ((unsigned long) insn_ch[0] << 24) + |
| 41 | ((unsigned long) insn_ch[1] << 16) + |
| 42 | ((unsigned long) insn_ch[2] << 8) + |
| 43 | ((unsigned long) insn_ch[3]); |
| 44 | #if DEBUG |
| 45 | printf ("find_bytes_big3: %lx\n", *insn); |
| 46 | #endif |
| 47 | } |
| 48 | |
| 49 | static void |
| 50 | find_bytes_little (unsigned char *insn_ch, unsigned long *insn) |
| 51 | { |
| 52 | *insn = |
| 53 | ((unsigned long) insn_ch[3] << 24) + |
| 54 | ((unsigned long) insn_ch[2] << 16) + |
| 55 | ((unsigned long) insn_ch[1] << 8) + |
| 56 | ((unsigned long) insn_ch[0]); |
| 57 | } |
| 58 | |
| 59 | typedef void (*find_byte_func_type) (unsigned char *, unsigned long *); |
| 60 | |
| 61 | static unsigned long |
| 62 | or32_extract (char param_ch, char *enc_initial, unsigned long insn) |
| 63 | { |
| 64 | char *enc; |
| 65 | unsigned long ret = 0; |
| 66 | int opc_pos = 0; |
| 67 | int param_pos = 0; |
| 68 | |
| 69 | for (enc = enc_initial; *enc != '\0'; enc++) |
| 70 | if (*enc == param_ch) |
| 71 | { |
| 72 | if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x')) |
| 73 | continue; |
| 74 | else |
| 75 | param_pos++; |
| 76 | } |
| 77 | |
| 78 | #if DEBUG |
| 79 | printf ("or32_extract: %c %x ", param_ch, param_pos); |
| 80 | #endif |
| 81 | opc_pos = 32; |
| 82 | |
| 83 | for (enc = enc_initial; *enc != '\0'; ) |
| 84 | if ((*enc == '0') && (*(enc + 1) == 'x')) |
| 85 | { |
| 86 | opc_pos -= 4; |
| 87 | |
| 88 | if ((param_ch == '0') || (param_ch == '1')) |
| 89 | { |
| 90 | unsigned long tmp = strtoul (enc, NULL, 16); |
| 91 | #if DEBUG |
| 92 | printf (" enc=%s, tmp=%lx ", enc, tmp); |
| 93 | #endif |
| 94 | if (param_ch == '0') |
| 95 | tmp = 15 - tmp; |
| 96 | ret |= tmp << opc_pos; |
| 97 | } |
| 98 | enc += 3; |
| 99 | } |
| 100 | else if ((*enc == '0') || (*enc == '1')) |
| 101 | { |
| 102 | opc_pos--; |
| 103 | if (param_ch == *enc) |
| 104 | ret |= 1 << opc_pos; |
| 105 | enc++; |
| 106 | } |
| 107 | else if (*enc == param_ch) |
| 108 | { |
| 109 | opc_pos--; |
| 110 | param_pos--; |
| 111 | #if DEBUG |
| 112 | printf ("\n ret=%lx opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos); |
| 113 | #endif |
| 114 | ret += ((insn >> opc_pos) & 0x1) << param_pos; |
| 115 | |
| 116 | if (!param_pos |
| 117 | && letter_signed (param_ch) |
| 118 | && ret >> (letter_range (param_ch) - 1)) |
| 119 | { |
| 120 | #if DEBUG |
| 121 | printf ("\n ret=%lx opc_pos=%x, param_pos=%x\n", |
| 122 | ret, opc_pos, param_pos); |
| 123 | #endif |
| 124 | ret |= 0xffffffff << letter_range(param_ch); |
| 125 | #if DEBUG |
| 126 | printf ("\n after conversion to signed: ret=%lx\n", ret); |
| 127 | #endif |
| 128 | } |
| 129 | enc++; |
| 130 | } |
| 131 | else if (ISALPHA (*enc)) |
| 132 | { |
| 133 | opc_pos--; |
| 134 | enc++; |
| 135 | } |
| 136 | else if (*enc == '-') |
| 137 | { |
| 138 | opc_pos--; |
| 139 | enc++; |
| 140 | } |
| 141 | else |
| 142 | enc++; |
| 143 | |
| 144 | #if DEBUG |
| 145 | printf ("ret=%lx\n", ret); |
| 146 | #endif |
| 147 | return ret; |
| 148 | } |
| 149 | |
| 150 | static int |
| 151 | or32_opcode_match (unsigned long insn, char *encoding) |
| 152 | { |
| 153 | unsigned long ones, zeros; |
| 154 | |
| 155 | #if DEBUG |
| 156 | printf ("or32_opcode_match: %.8lx\n", insn); |
| 157 | #endif |
| 158 | ones = or32_extract ('1', encoding, insn); |
| 159 | zeros = or32_extract ('0', encoding, insn); |
| 160 | |
| 161 | #if DEBUG |
| 162 | printf ("ones: %lx \n", ones); |
| 163 | printf ("zeros: %lx \n", zeros); |
| 164 | #endif |
| 165 | if ((insn & ones) != ones) |
| 166 | { |
| 167 | #if DEBUG |
| 168 | printf ("ret1\n"); |
| 169 | #endif |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | if ((~insn & zeros) != zeros) |
| 174 | { |
| 175 | #if DEBUG |
| 176 | printf ("ret2\n"); |
| 177 | #endif |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | #if DEBUG |
| 182 | printf ("ret3\n"); |
| 183 | #endif |
| 184 | return 1; |
| 185 | } |
| 186 | |
| 187 | /* Print register to INFO->STREAM. Used only by print_insn. */ |
| 188 | |
| 189 | static void |
| 190 | or32_print_register (char param_ch, |
| 191 | char *encoding, |
| 192 | unsigned long insn, |
| 193 | struct disassemble_info *info) |
| 194 | { |
| 195 | int regnum = or32_extract (param_ch, encoding, insn); |
| 196 | |
| 197 | #if DEBUG |
| 198 | printf ("or32_print_register: %c, %s, %lx\n", param_ch, encoding, insn); |
| 199 | #endif |
| 200 | if (param_ch == 'A') |
| 201 | (*info->fprintf_func) (info->stream, "r%d", regnum); |
| 202 | else if (param_ch == 'B') |
| 203 | (*info->fprintf_func) (info->stream, "r%d", regnum); |
| 204 | else if (param_ch == 'D') |
| 205 | (*info->fprintf_func) (info->stream, "r%d", regnum); |
| 206 | else if (regnum < 16) |
| 207 | (*info->fprintf_func) (info->stream, "r%d", regnum); |
| 208 | else if (regnum < 32) |
| 209 | (*info->fprintf_func) (info->stream, "r%d", regnum-16); |
| 210 | else |
| 211 | (*info->fprintf_func) (info->stream, "X%d", regnum); |
| 212 | } |
| 213 | |
| 214 | /* Print immediate to INFO->STREAM. Used only by print_insn. */ |
| 215 | |
| 216 | static void |
| 217 | or32_print_immediate (char param_ch, |
| 218 | char *encoding, |
| 219 | unsigned long insn, |
| 220 | struct disassemble_info *info) |
| 221 | { |
| 222 | int imm = or32_extract(param_ch, encoding, insn); |
| 223 | |
| 224 | if (letter_signed(param_ch)) |
| 225 | (*info->fprintf_func) (info->stream, "0x%x", imm); |
| 226 | /* (*info->fprintf_func) (info->stream, "%d", imm); */ |
| 227 | else |
| 228 | (*info->fprintf_func) (info->stream, "0x%x", imm); |
| 229 | } |
| 230 | |
| 231 | /* Print one instruction from MEMADDR on INFO->STREAM. |
| 232 | Return the size of the instruction (always 4 on or32). */ |
| 233 | |
| 234 | static int |
| 235 | print_insn (bfd_vma memaddr, struct disassemble_info *info) |
| 236 | { |
| 237 | /* The raw instruction. */ |
| 238 | unsigned char insn_ch[4]; |
| 239 | /* Address. Will be sign extened 27-bit. */ |
| 240 | unsigned long addr; |
| 241 | /* The four bytes of the instruction. */ |
| 242 | unsigned long insn; |
| 243 | find_byte_func_type find_byte_func = (find_byte_func_type) info->private_data; |
| 244 | struct or32_opcode const * opcode; |
| 245 | |
| 246 | { |
| 247 | int status = |
| 248 | (*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info); |
| 249 | |
| 250 | if (status != 0) |
| 251 | { |
| 252 | (*info->memory_error_func) (status, memaddr, info); |
| 253 | return -1; |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | (*find_byte_func) (&insn_ch[0], &insn); |
| 258 | |
| 259 | for (opcode = &or32_opcodes[0]; |
| 260 | opcode < &or32_opcodes[or32_num_opcodes]; |
| 261 | ++opcode) |
| 262 | { |
| 263 | if (or32_opcode_match (insn, opcode->encoding)) |
| 264 | { |
| 265 | char *s; |
| 266 | |
| 267 | (*info->fprintf_func) (info->stream, "%s ", opcode->name); |
| 268 | |
| 269 | for (s = opcode->args; *s != '\0'; ++s) |
| 270 | { |
| 271 | switch (*s) |
| 272 | { |
| 273 | case '\0': |
| 274 | return 4; |
| 275 | |
| 276 | case 'r': |
| 277 | or32_print_register (*++s, opcode->encoding, insn, info); |
| 278 | break; |
| 279 | |
| 280 | case 'X': |
| 281 | addr = or32_extract ('X', opcode->encoding, insn) << 2; |
| 282 | |
| 283 | /* Calulate the correct address. XXX is this really correct ?? */ |
| 284 | addr = memaddr + EXTEND29 (addr); |
| 285 | |
| 286 | (*info->print_address_func) |
| 287 | (addr, info); |
| 288 | break; |
| 289 | |
| 290 | default: |
| 291 | if (strchr (opcode->encoding, *s)) |
| 292 | or32_print_immediate (*s, opcode->encoding, insn, info); |
| 293 | else |
| 294 | (*info->fprintf_func) (info->stream, "%c", *s); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | return 4; |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | /* This used to be %8x for binutils. */ |
| 303 | (*info->fprintf_func) |
| 304 | (info->stream, ".word 0x%08lx", insn); |
| 305 | return 4; |
| 306 | } |
| 307 | |
| 308 | /* Disassemble a big-endian or32 instruction. */ |
| 309 | |
| 310 | int |
| 311 | print_insn_big_or32 (bfd_vma memaddr, struct disassemble_info *info) |
| 312 | { |
| 313 | info->private_data = find_bytes_big; |
| 314 | |
| 315 | return print_insn (memaddr, info); |
| 316 | } |
| 317 | |
| 318 | /* Disassemble a little-endian or32 instruction. */ |
| 319 | |
| 320 | int |
| 321 | print_insn_little_or32 (bfd_vma memaddr, struct disassemble_info *info) |
| 322 | { |
| 323 | info->private_data = find_bytes_little; |
| 324 | return print_insn (memaddr, info); |
| 325 | } |