| 1 | /* Disassembler for the i860. |
| 2 | Copyright 2000 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Jason Eckhardt <jle@cygnus.com>. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program 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 |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | #include "dis-asm.h" |
| 21 | #include "opcode/i860.h" |
| 22 | |
| 23 | /* Later we should probably choose the prefix based on which OS flavor. */ |
| 24 | #define I860_REG_PREFIX "%" |
| 25 | |
| 26 | /* Integer register names (encoded as 0..31 in the instruction). */ |
| 27 | static const char *const grnames[] = |
| 28 | {"r0", "r1", "sp", "fp", "r4", "r5", "r6", "r7", |
| 29 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 30 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 31 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"}; |
| 32 | |
| 33 | /* FP register names (encoded as 0..31 in the instruction). */ |
| 34 | static const char *const frnames[] = |
| 35 | {"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", |
| 36 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| 37 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", |
| 38 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31"}; |
| 39 | |
| 40 | /* Control/status register names (encoded as 0..5 in the instruction). */ |
| 41 | static const char *const crnames[] = |
| 42 | {"fir", "psr", "dirbase", "db", "fsr", "epsr", "", ""}; |
| 43 | |
| 44 | |
| 45 | /* Prototypes. */ |
| 46 | static int sign_ext PARAMS((unsigned int, int)); |
| 47 | static void print_br_address PARAMS((disassemble_info *, bfd_vma, long)); |
| 48 | |
| 49 | |
| 50 | /* True if opcode is xor, xorh, and, andh, or, orh, andnot, andnoth. */ |
| 51 | #define BITWISE_OP(op) ((op) == 0x30 || (op) == 0x31 \ |
| 52 | || (op) == 0x34 || (op) == 0x35 \ |
| 53 | || (op) == 0x38 || (op) == 0x39 \ |
| 54 | || (op) == 0x3c || (op) == 0x3d \ |
| 55 | || (op) == 0x33 || (op) == 0x37 \ |
| 56 | || (op) == 0x3b || (op) == 0x3f) |
| 57 | |
| 58 | |
| 59 | /* Sign extend N-bit number. */ |
| 60 | static int |
| 61 | sign_ext (x, n) |
| 62 | unsigned int x; |
| 63 | int n; |
| 64 | { |
| 65 | int t; |
| 66 | t = x >> (n - 1); |
| 67 | t = ((-t) << n) | x; |
| 68 | return t; |
| 69 | } |
| 70 | |
| 71 | |
| 72 | /* Print a PC-relative branch offset. VAL is the sign extended value |
| 73 | from the branch instruction. */ |
| 74 | static void |
| 75 | print_br_address (info, memaddr, val) |
| 76 | disassemble_info *info; |
| 77 | bfd_vma memaddr; |
| 78 | long val; |
| 79 | { |
| 80 | |
| 81 | long adj = (long)memaddr + 4 + (val << 2); |
| 82 | |
| 83 | (*info->fprintf_func) (info->stream, "0x%08x", adj); |
| 84 | |
| 85 | /* Attempt to obtain a symbol for the target address. */ |
| 86 | |
| 87 | if (info->print_address_func && adj != 0) |
| 88 | { |
| 89 | (*info->fprintf_func) (info->stream, "\t// "); |
| 90 | (*info->print_address_func) (adj, info); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | |
| 95 | /* Print one instruction. */ |
| 96 | int |
| 97 | print_insn_i860 (memaddr, info) |
| 98 | bfd_vma memaddr; |
| 99 | disassemble_info *info; |
| 100 | { |
| 101 | bfd_byte buff[4]; |
| 102 | unsigned int insn, i; |
| 103 | int status; |
| 104 | const struct i860_opcode *opcode = 0; |
| 105 | |
| 106 | status = (*info->read_memory_func) (memaddr, buff, sizeof (buff), info); |
| 107 | if (status != 0) |
| 108 | { |
| 109 | (*info->memory_error_func) (status, memaddr, info); |
| 110 | return -1; |
| 111 | } |
| 112 | |
| 113 | /* Note that i860 instructions are always accessed as little endian |
| 114 | data, regardless of the endian mode of the i860. */ |
| 115 | insn = bfd_getl32 (buff); |
| 116 | |
| 117 | status = 0; |
| 118 | i = 0; |
| 119 | while (i860_opcodes[i].name != NULL) |
| 120 | { |
| 121 | opcode = &i860_opcodes[i]; |
| 122 | if ((insn & opcode->match) == opcode->match |
| 123 | && (insn & opcode->lose) == 0) |
| 124 | { |
| 125 | status = 1; |
| 126 | break; |
| 127 | } |
| 128 | ++i; |
| 129 | } |
| 130 | |
| 131 | if (status == 0) |
| 132 | { |
| 133 | /* Instruction not in opcode table. */ |
| 134 | (*info->fprintf_func) (info->stream, ".long %#08x", insn); |
| 135 | } |
| 136 | else |
| 137 | { |
| 138 | const char *s; |
| 139 | int val; |
| 140 | |
| 141 | /* If this a flop and its dual bit is set, prefix with 'd.'. */ |
| 142 | if ((insn & 0xfc000000) == 0x48000000 && (insn & 0x200)) |
| 143 | (*info->fprintf_func) (info->stream, "d.%s\t", opcode->name); |
| 144 | else |
| 145 | (*info->fprintf_func) (info->stream, "%s\t", opcode->name); |
| 146 | |
| 147 | for (s = opcode->args; *s; s++) |
| 148 | { |
| 149 | switch (*s) |
| 150 | { |
| 151 | /* Integer register (src1). */ |
| 152 | case '1': |
| 153 | (*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX, |
| 154 | grnames[(insn >> 11) & 0x1f]); |
| 155 | break; |
| 156 | |
| 157 | /* Integer register (src2). */ |
| 158 | case '2': |
| 159 | (*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX, |
| 160 | grnames[(insn >> 21) & 0x1f]); |
| 161 | break; |
| 162 | |
| 163 | /* Integer destination register. */ |
| 164 | case 'd': |
| 165 | (*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX, |
| 166 | grnames[(insn >> 16) & 0x1f]); |
| 167 | break; |
| 168 | |
| 169 | /* Floating-point register (src1). */ |
| 170 | case 'e': |
| 171 | (*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX, |
| 172 | frnames[(insn >> 11) & 0x1f]); |
| 173 | break; |
| 174 | |
| 175 | /* Floating-point register (src2). */ |
| 176 | case 'f': |
| 177 | (*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX, |
| 178 | frnames[(insn >> 21) & 0x1f]); |
| 179 | break; |
| 180 | |
| 181 | /* Floating-point destination register. */ |
| 182 | case 'g': |
| 183 | (*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX, |
| 184 | frnames[(insn >> 16) & 0x1f]); |
| 185 | break; |
| 186 | |
| 187 | /* Control register. */ |
| 188 | case 'c': |
| 189 | (*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX, |
| 190 | crnames[(insn >> 21) & 0x7]); |
| 191 | break; |
| 192 | |
| 193 | /* 16-bit immediate (sign extend, except for bitwise ops). */ |
| 194 | case 'i': |
| 195 | if (BITWISE_OP ((insn & 0xfc000000) >> 26)) |
| 196 | (*info->fprintf_func) (info->stream, "0x%04x", |
| 197 | (unsigned int) (insn & 0xffff)); |
| 198 | else |
| 199 | (*info->fprintf_func) (info->stream, "%d", |
| 200 | sign_ext ((insn & 0xffff), 16)); |
| 201 | break; |
| 202 | |
| 203 | /* 16-bit immediate, aligned (2^0, ld.b). */ |
| 204 | case 'I': |
| 205 | (*info->fprintf_func) (info->stream, "%d", |
| 206 | sign_ext ((insn & 0xffff), 16)); |
| 207 | break; |
| 208 | |
| 209 | /* 16-bit immediate, aligned (2^1, ld.s). */ |
| 210 | case 'J': |
| 211 | (*info->fprintf_func) (info->stream, "%d", |
| 212 | sign_ext ((insn & 0xfffe), 16)); |
| 213 | break; |
| 214 | |
| 215 | /* 16-bit immediate, aligned (2^2, ld.l, {p}fld.l, fst.l). */ |
| 216 | case 'K': |
| 217 | (*info->fprintf_func) (info->stream, "%d", |
| 218 | sign_ext ((insn & 0xfffc), 16)); |
| 219 | break; |
| 220 | |
| 221 | /* 16-bit immediate, aligned (2^3, {p}fld.d, fst.d). */ |
| 222 | case 'L': |
| 223 | (*info->fprintf_func) (info->stream, "%d", |
| 224 | sign_ext ((insn & 0xfff8), 16)); |
| 225 | break; |
| 226 | |
| 227 | /* 16-bit immediate, aligned (2^4, {p}fld.q, fst.q). */ |
| 228 | case 'M': |
| 229 | (*info->fprintf_func) (info->stream, "%d", |
| 230 | sign_ext ((insn & 0xfff0), 16)); |
| 231 | break; |
| 232 | |
| 233 | /* 5-bit immediate (zero extend). */ |
| 234 | case '5': |
| 235 | (*info->fprintf_func) (info->stream, "%d", |
| 236 | ((insn >> 11) & 0x1f)); |
| 237 | break; |
| 238 | |
| 239 | /* Split 16 bit immediate (20..16:10..0). */ |
| 240 | case 's': |
| 241 | val = ((insn >> 5) & 0xf800) | (insn & 0x07ff); |
| 242 | (*info->fprintf_func) (info->stream, "%d", |
| 243 | sign_ext (val, 16)); |
| 244 | break; |
| 245 | |
| 246 | /* Split 16 bit immediate, aligned. (2^0, st.b). */ |
| 247 | case 'S': |
| 248 | val = ((insn >> 5) & 0xf800) | (insn & 0x07ff); |
| 249 | (*info->fprintf_func) (info->stream, "%d", |
| 250 | sign_ext (val, 16)); |
| 251 | break; |
| 252 | |
| 253 | /* Split 16 bit immediate, aligned. (2^1, st.s). */ |
| 254 | case 'T': |
| 255 | val = ((insn >> 5) & 0xf800) | (insn & 0x07fe); |
| 256 | (*info->fprintf_func) (info->stream, "%d", |
| 257 | sign_ext (val, 16)); |
| 258 | break; |
| 259 | |
| 260 | /* Split 16 bit immediate, aligned. (2^2, st.l). */ |
| 261 | case 'U': |
| 262 | val = ((insn >> 5) & 0xf800) | (insn & 0x07fc); |
| 263 | (*info->fprintf_func) (info->stream, "%d", |
| 264 | sign_ext (val, 16)); |
| 265 | break; |
| 266 | |
| 267 | /* 26-bit PC relative immediate (lbroff). */ |
| 268 | case 'l': |
| 269 | val = sign_ext ((insn & 0x03ffffff), 26); |
| 270 | print_br_address (info, memaddr, val); |
| 271 | break; |
| 272 | |
| 273 | /* 16-bit PC relative immediate (sbroff). */ |
| 274 | case 'r': |
| 275 | val = sign_ext ((((insn >> 5) & 0xf800) | (insn & 0x07ff)), 16); |
| 276 | print_br_address (info, memaddr, val); |
| 277 | break; |
| 278 | |
| 279 | default: |
| 280 | (*info->fprintf_func) (info->stream, "%c", *s); |
| 281 | break; |
| 282 | } |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | return sizeof (insn); |
| 287 | } |
| 288 | |