| 1 | /* Disassemble SH instructions. |
| 2 | Copyright (C) 1993, 94, 95, 96, 1997 Free Software Foundation, Inc. |
| 3 | |
| 4 | This program is free software; you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License as published by |
| 6 | the Free Software Foundation; either version 2 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program; if not, write to the Free Software |
| 16 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 17 | |
| 18 | #include <stdio.h> |
| 19 | #define STATIC_TABLE |
| 20 | #define DEFINE_TABLE |
| 21 | |
| 22 | #include "sh-opc.h" |
| 23 | #include "dis-asm.h" |
| 24 | |
| 25 | #define LITTLE_BIT 2 |
| 26 | |
| 27 | static int |
| 28 | print_insn_shx (memaddr, info) |
| 29 | bfd_vma memaddr; |
| 30 | struct disassemble_info *info; |
| 31 | { |
| 32 | fprintf_ftype fprintf_fn = info->fprintf_func; |
| 33 | void *stream = info->stream; |
| 34 | unsigned char insn[2]; |
| 35 | unsigned char nibs[4]; |
| 36 | int status; |
| 37 | int relmask = ~0; |
| 38 | sh_opcode_info *op; |
| 39 | |
| 40 | status = info->read_memory_func (memaddr, insn, 2, info); |
| 41 | |
| 42 | if (status != 0) |
| 43 | { |
| 44 | info->memory_error_func (status, memaddr, info); |
| 45 | return -1; |
| 46 | } |
| 47 | |
| 48 | if (info->flags & LITTLE_BIT) |
| 49 | { |
| 50 | nibs[0] = (insn[1] >> 4) & 0xf; |
| 51 | nibs[1] = insn[1] & 0xf; |
| 52 | |
| 53 | nibs[2] = (insn[0] >> 4) & 0xf; |
| 54 | nibs[3] = insn[0] & 0xf; |
| 55 | } |
| 56 | else |
| 57 | { |
| 58 | nibs[0] = (insn[0] >> 4) & 0xf; |
| 59 | nibs[1] = insn[0] & 0xf; |
| 60 | |
| 61 | nibs[2] = (insn[1] >> 4) & 0xf; |
| 62 | nibs[3] = insn[1] & 0xf; |
| 63 | } |
| 64 | |
| 65 | for (op = sh_table; op->name; op++) |
| 66 | { |
| 67 | int n; |
| 68 | int imm; |
| 69 | int rn; |
| 70 | int rm; |
| 71 | int rb; |
| 72 | |
| 73 | for (n = 0; n < 4; n++) |
| 74 | { |
| 75 | int i = op->nibbles[n]; |
| 76 | |
| 77 | if (i < 16) |
| 78 | { |
| 79 | if (nibs[n] == i) |
| 80 | continue; |
| 81 | goto fail; |
| 82 | } |
| 83 | switch (i) |
| 84 | { |
| 85 | case BRANCH_8: |
| 86 | imm = (nibs[2] << 4) | (nibs[3]); |
| 87 | if (imm & 0x80) |
| 88 | imm |= ~0xff; |
| 89 | imm = ((char)imm) * 2 + 4 ; |
| 90 | goto ok; |
| 91 | case BRANCH_12: |
| 92 | imm = ((nibs[1]) << 8) | (nibs[2] << 4) | (nibs[3]); |
| 93 | if (imm & 0x800) |
| 94 | imm |= ~0xfff; |
| 95 | imm = imm * 2 + 4; |
| 96 | goto ok; |
| 97 | case IMM_4: |
| 98 | imm = nibs[3]; |
| 99 | goto ok; |
| 100 | case IMM_4BY2: |
| 101 | imm = nibs[3] <<1; |
| 102 | goto ok; |
| 103 | case IMM_4BY4: |
| 104 | imm = nibs[3] <<2; |
| 105 | goto ok; |
| 106 | case IMM_8: |
| 107 | imm = (nibs[2] << 4) | nibs[3]; |
| 108 | goto ok; |
| 109 | case PCRELIMM_8BY2: |
| 110 | imm = ((nibs[2] << 4) | nibs[3]) <<1; |
| 111 | relmask = ~1; |
| 112 | goto ok; |
| 113 | case PCRELIMM_8BY4: |
| 114 | imm = ((nibs[2] << 4) | nibs[3]) <<2; |
| 115 | relmask = ~3; |
| 116 | goto ok; |
| 117 | case IMM_8BY2: |
| 118 | imm = ((nibs[2] << 4) | nibs[3]) <<1; |
| 119 | goto ok; |
| 120 | case IMM_8BY4: |
| 121 | imm = ((nibs[2] << 4) | nibs[3]) <<2; |
| 122 | goto ok; |
| 123 | case DISP_8: |
| 124 | imm = (nibs[2] << 4) | (nibs[3]); |
| 125 | goto ok; |
| 126 | case DISP_4: |
| 127 | imm = nibs[3]; |
| 128 | goto ok; |
| 129 | case REG_N: |
| 130 | rn = nibs[n]; |
| 131 | break; |
| 132 | case REG_M: |
| 133 | rm = nibs[n]; |
| 134 | break; |
| 135 | case REG_B: |
| 136 | rb = nibs[n] & 0x07; |
| 137 | break; |
| 138 | default: |
| 139 | abort(); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | ok: |
| 144 | fprintf_fn (stream,"%s\t", op->name); |
| 145 | for (n = 0; n < 3 && op->arg[n] != A_END; n++) |
| 146 | { |
| 147 | if (n && op->arg[1] != A_END) |
| 148 | fprintf_fn (stream, ","); |
| 149 | switch (op->arg[n]) |
| 150 | { |
| 151 | case A_IMM: |
| 152 | fprintf_fn (stream, "#%d", (char)(imm)); |
| 153 | break; |
| 154 | case A_R0: |
| 155 | fprintf_fn (stream, "r0"); |
| 156 | break; |
| 157 | case A_REG_N: |
| 158 | fprintf_fn (stream, "r%d", rn); |
| 159 | break; |
| 160 | case A_INC_N: |
| 161 | fprintf_fn (stream, "@r%d+", rn); |
| 162 | break; |
| 163 | case A_DEC_N: |
| 164 | fprintf_fn (stream, "@-r%d", rn); |
| 165 | break; |
| 166 | case A_IND_N: |
| 167 | fprintf_fn (stream, "@r%d", rn); |
| 168 | break; |
| 169 | case A_DISP_REG_N: |
| 170 | fprintf_fn (stream, "@(%d,r%d)", imm, rn); |
| 171 | break; |
| 172 | case A_REG_M: |
| 173 | fprintf_fn (stream, "r%d", rm); |
| 174 | break; |
| 175 | case A_INC_M: |
| 176 | fprintf_fn (stream, "@r%d+", rm); |
| 177 | break; |
| 178 | case A_DEC_M: |
| 179 | fprintf_fn (stream, "@-r%d", rm); |
| 180 | break; |
| 181 | case A_IND_M: |
| 182 | fprintf_fn (stream, "@r%d", rm); |
| 183 | break; |
| 184 | case A_DISP_REG_M: |
| 185 | fprintf_fn (stream, "@(%d,r%d)", imm, rm); |
| 186 | break; |
| 187 | case A_REG_B: |
| 188 | fprintf_fn (stream, "r%d_bank", rb); |
| 189 | break; |
| 190 | case A_DISP_PC: |
| 191 | fprintf_fn (stream, "0x%0x", imm + 4 + (memaddr & relmask)); |
| 192 | break; |
| 193 | case A_IND_R0_REG_N: |
| 194 | fprintf_fn (stream, "@(r0,r%d)", rn); |
| 195 | break; |
| 196 | case A_IND_R0_REG_M: |
| 197 | fprintf_fn (stream, "@(r0,r%d)", rm); |
| 198 | break; |
| 199 | case A_DISP_GBR: |
| 200 | fprintf_fn (stream, "@(%d,gbr)",imm); |
| 201 | break; |
| 202 | case A_R0_GBR: |
| 203 | fprintf_fn (stream, "@(r0,gbr)"); |
| 204 | break; |
| 205 | case A_BDISP12: |
| 206 | case A_BDISP8: |
| 207 | (*info->print_address_func) (imm + memaddr, info); |
| 208 | break; |
| 209 | case A_SR: |
| 210 | fprintf_fn (stream, "sr"); |
| 211 | break; |
| 212 | case A_GBR: |
| 213 | fprintf_fn (stream, "gbr"); |
| 214 | break; |
| 215 | case A_VBR: |
| 216 | fprintf_fn (stream, "vbr"); |
| 217 | break; |
| 218 | case A_SSR: |
| 219 | fprintf_fn (stream, "ssr"); |
| 220 | break; |
| 221 | case A_SPC: |
| 222 | fprintf_fn (stream, "spc"); |
| 223 | break; |
| 224 | case A_MACH: |
| 225 | fprintf_fn (stream, "mach"); |
| 226 | break; |
| 227 | case A_MACL: |
| 228 | fprintf_fn (stream ,"macl"); |
| 229 | break; |
| 230 | case A_PR: |
| 231 | fprintf_fn (stream, "pr"); |
| 232 | break; |
| 233 | case F_REG_N: |
| 234 | fprintf_fn (stream, "fr%d", rn); |
| 235 | break; |
| 236 | case F_REG_M: |
| 237 | fprintf_fn (stream, "fr%d", rm); |
| 238 | break; |
| 239 | case FPSCR_M: |
| 240 | case FPSCR_N: |
| 241 | fprintf_fn (stream, "fpscr"); |
| 242 | break; |
| 243 | case FPUL_M: |
| 244 | case FPUL_N: |
| 245 | fprintf_fn (stream, "fpul"); |
| 246 | break; |
| 247 | case F_FR0: |
| 248 | fprintf_fn (stream, "fr0"); |
| 249 | break; |
| 250 | default: |
| 251 | abort(); |
| 252 | } |
| 253 | |
| 254 | } |
| 255 | |
| 256 | if (!(info->flags & 1) |
| 257 | && (op->name[0] == 'j' |
| 258 | || (op->name[0] == 'b' |
| 259 | && (op->name[1] == 'r' |
| 260 | || op->name[1] == 's')) |
| 261 | || (op->name[0] == 'r' && op->name[1] == 't') |
| 262 | || (op->name[0] == 'b' && op->name[2] == '.'))) |
| 263 | { |
| 264 | info->flags |= 1; |
| 265 | fprintf_fn (stream, "\t(slot "); |
| 266 | print_insn_shx (memaddr + 2, info); |
| 267 | info->flags &= ~1; |
| 268 | fprintf_fn (stream, ")"); |
| 269 | return 4; |
| 270 | } |
| 271 | |
| 272 | return 2; |
| 273 | fail: |
| 274 | ; |
| 275 | |
| 276 | } |
| 277 | fprintf_fn (stream, ".word 0x%x%x%x%x", nibs[0], nibs[1], nibs[2], nibs[3]); |
| 278 | return 2; |
| 279 | } |
| 280 | |
| 281 | int |
| 282 | print_insn_shl (memaddr, info) |
| 283 | bfd_vma memaddr; |
| 284 | struct disassemble_info *info; |
| 285 | { |
| 286 | int r; |
| 287 | |
| 288 | info->flags = LITTLE_BIT; |
| 289 | r = print_insn_shx (memaddr, info); |
| 290 | return r; |
| 291 | } |
| 292 | |
| 293 | int |
| 294 | print_insn_sh (memaddr, info) |
| 295 | bfd_vma memaddr; |
| 296 | struct disassemble_info *info; |
| 297 | { |
| 298 | int r; |
| 299 | |
| 300 | info->flags = 0; |
| 301 | r = print_insn_shx (memaddr, info); |
| 302 | return r; |
| 303 | } |