| 1 | /* Print Convex instructions for GDB, the GNU debugger. |
| 2 | Copyright 1989, 1991 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "symtab.h" |
| 22 | |
| 23 | /* reg (fmt_field, inst_field) -- |
| 24 | the {first,second,third} operand of instruction as fmt_field = [ijk] |
| 25 | gets the value of the field from the [ijk] position of the instruction */ |
| 26 | |
| 27 | #define reg(a,b) ((char (*)[3])(op[fmt->a]))[inst.f0.b] |
| 28 | |
| 29 | /* lit (fmt_field) -- field [ijk] is a literal (PSW, VL, eg) */ |
| 30 | |
| 31 | #define lit(i) op[fmt->i] |
| 32 | |
| 33 | /* aj[j] -- name for A register j */ |
| 34 | |
| 35 | #define aj ((char (*)[3])(op[A])) |
| 36 | \f |
| 37 | union inst { |
| 38 | struct { |
| 39 | unsigned : 7; |
| 40 | unsigned i : 3; |
| 41 | unsigned j : 3; |
| 42 | unsigned k : 3; |
| 43 | unsigned : 16; |
| 44 | unsigned : 32; |
| 45 | } f0; |
| 46 | struct { |
| 47 | unsigned : 8; |
| 48 | unsigned indir : 1; |
| 49 | unsigned len : 1; |
| 50 | unsigned j : 3; |
| 51 | unsigned k : 3; |
| 52 | unsigned : 16; |
| 53 | unsigned : 32; |
| 54 | } f1; |
| 55 | unsigned char byte[8]; |
| 56 | unsigned short half[4]; |
| 57 | char signed_byte[8]; |
| 58 | short signed_half[4]; |
| 59 | }; |
| 60 | |
| 61 | struct opform { |
| 62 | int mask; /* opcode mask */ |
| 63 | int shift; /* opcode align */ |
| 64 | struct formstr *formstr[3]; /* ST, E0, E1 */ |
| 65 | }; |
| 66 | |
| 67 | struct formstr { |
| 68 | unsigned lop:8, rop:5; /* opcode */ |
| 69 | unsigned fmt:5; /* inst format */ |
| 70 | unsigned i:5, j:5, k:2; /* operand formats */ |
| 71 | }; |
| 72 | |
| 73 | #include "convx-opcode.h" |
| 74 | |
| 75 | unsigned char formdecode [] = { |
| 76 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 77 | 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, |
| 78 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 79 | 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, |
| 80 | 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
| 81 | 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, |
| 82 | 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, |
| 83 | 4,4,4,4,4,4,4,4,5,5,5,5,6,6,7,8, |
| 84 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 85 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 86 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 87 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 88 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 89 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 90 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 91 | 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
| 92 | }; |
| 93 | |
| 94 | struct opform opdecode[] = { |
| 95 | 0x7e00, 9, format0, e0_format0, e1_format0, |
| 96 | 0x3f00, 8, format1, e0_format1, e1_format1, |
| 97 | 0x1fc0, 6, format2, e0_format2, e1_format2, |
| 98 | 0x0fc0, 6, format3, e0_format3, e1_format3, |
| 99 | 0x0700, 8, format4, e0_format4, e1_format4, |
| 100 | 0x03c0, 6, format5, e0_format5, e1_format5, |
| 101 | 0x01f8, 3, format6, e0_format6, e1_format6, |
| 102 | 0x00f8, 3, format7, e0_format7, e1_format7, |
| 103 | 0x0000, 0, formatx, formatx, formatx, |
| 104 | 0x0f80, 7, formatx, formatx, formatx, |
| 105 | 0x0f80, 7, formatx, formatx, formatx, |
| 106 | }; |
| 107 | \f |
| 108 | /* Print the instruction at address MEMADDR in debugged memory, |
| 109 | on STREAM. Returns length of the instruction, in bytes. */ |
| 110 | |
| 111 | int |
| 112 | print_insn (memaddr, stream) |
| 113 | CORE_ADDR memaddr; |
| 114 | FILE *stream; |
| 115 | { |
| 116 | union inst inst; |
| 117 | struct formstr *fmt; |
| 118 | register int format, op1, pfx; |
| 119 | int l; |
| 120 | |
| 121 | read_memory (memaddr, &inst, sizeof inst); |
| 122 | |
| 123 | /* Remove and note prefix, if present */ |
| 124 | |
| 125 | pfx = inst.half[0]; |
| 126 | if ((pfx & 0xfff0) == 0x7ef0) |
| 127 | { |
| 128 | pfx = ((pfx >> 3) & 1) + 1; |
| 129 | *(long long *) &inst = *(long long *) &inst.half[1]; |
| 130 | } |
| 131 | else pfx = 0; |
| 132 | |
| 133 | /* Split opcode into format.op1 and look up in appropriate table */ |
| 134 | |
| 135 | format = formdecode[inst.byte[0]]; |
| 136 | op1 = (inst.half[0] & opdecode[format].mask) >> opdecode[format].shift; |
| 137 | if (format == 9) |
| 138 | { |
| 139 | if (pfx) |
| 140 | fmt = formatx; |
| 141 | else if (inst.f1.j == 0) |
| 142 | fmt = &format1a[op1]; |
| 143 | else if (inst.f1.j == 1) |
| 144 | fmt = &format1b[op1]; |
| 145 | else |
| 146 | fmt = formatx; |
| 147 | } |
| 148 | else |
| 149 | fmt = &opdecode[format].formstr[pfx][op1]; |
| 150 | |
| 151 | /* Print it */ |
| 152 | |
| 153 | if (fmt->fmt == xxx) |
| 154 | { |
| 155 | /* noninstruction */ |
| 156 | fprintf (stream, "0x%04x", pfx ? pfx : inst.half[0]); |
| 157 | return 2; |
| 158 | } |
| 159 | |
| 160 | if (pfx) |
| 161 | pfx = 2; |
| 162 | |
| 163 | fprintf (stream, "%s%s%s", lop[fmt->lop], rop[fmt->rop], |
| 164 | &" "[strlen(lop[fmt->lop]) + strlen(rop[fmt->rop])]); |
| 165 | |
| 166 | switch (fmt->fmt) |
| 167 | { |
| 168 | case rrr: /* three register */ |
| 169 | fprintf (stream, "%s,%s,%s", reg(i,i), reg(j,j), reg(k,k)); |
| 170 | return pfx + 2; |
| 171 | |
| 172 | case rr: /* two register */ |
| 173 | fprintf (stream, "%s,%s", reg(i,j), reg(j,k)); |
| 174 | return pfx + 2; |
| 175 | |
| 176 | case rxr: /* two register, reversed i and j fields */ |
| 177 | fprintf (stream, "%s,%s", reg(i,k), reg(j,j)); |
| 178 | return pfx + 2; |
| 179 | |
| 180 | case r: /* one register */ |
| 181 | fprintf (stream, "%s", reg(i,k)); |
| 182 | return pfx + 2; |
| 183 | |
| 184 | case nops: /* no operands */ |
| 185 | return pfx + 2; |
| 186 | |
| 187 | case nr: /* short immediate, one register */ |
| 188 | fprintf (stream, "#%d,%s", inst.f0.j, reg(i,k)); |
| 189 | return pfx + 2; |
| 190 | |
| 191 | case pcrel: /* pc relative */ |
| 192 | print_address (memaddr + 2 * inst.signed_byte[1], stream); |
| 193 | return pfx + 2; |
| 194 | |
| 195 | case lr: /* literal, one register */ |
| 196 | fprintf (stream, "%s,%s", lit(i), reg(j,k)); |
| 197 | return pfx + 2; |
| 198 | |
| 199 | case rxl: /* one register, literal */ |
| 200 | fprintf (stream, "%s,%s", reg(i,k), lit(j)); |
| 201 | return pfx + 2; |
| 202 | |
| 203 | case rlr: /* register, literal, register */ |
| 204 | fprintf (stream, "%s,%s,%s", reg(i,j), lit(j), reg(k,k)); |
| 205 | return pfx + 2; |
| 206 | |
| 207 | case rrl: /* register, register, literal */ |
| 208 | fprintf (stream, "%s,%s,%s", reg(i,j), reg(j,k), lit(k)); |
| 209 | return pfx + 2; |
| 210 | |
| 211 | case iml: /* immediate, literal */ |
| 212 | if (inst.f1.len) |
| 213 | { |
| 214 | fprintf (stream, "#%#x,%s", |
| 215 | (inst.signed_half[1] << 16) + inst.half[2], lit(i)); |
| 216 | return pfx + 6; |
| 217 | } |
| 218 | else |
| 219 | { |
| 220 | fprintf (stream, "#%d,%s", inst.signed_half[1], lit(i)); |
| 221 | return pfx + 4; |
| 222 | } |
| 223 | |
| 224 | case imr: /* immediate, register */ |
| 225 | if (inst.f1.len) |
| 226 | { |
| 227 | fprintf (stream, "#%#x,%s", |
| 228 | (inst.signed_half[1] << 16) + inst.half[2], reg(i,k)); |
| 229 | return pfx + 6; |
| 230 | } |
| 231 | else |
| 232 | { |
| 233 | fprintf (stream, "#%d,%s", inst.signed_half[1], reg(i,k)); |
| 234 | return pfx + 4; |
| 235 | } |
| 236 | |
| 237 | case a1r: /* memory, register */ |
| 238 | l = print_effa (inst, stream); |
| 239 | fprintf (stream, ",%s", reg(i,k)); |
| 240 | return pfx + l; |
| 241 | |
| 242 | case a1l: /* memory, literal */ |
| 243 | l = print_effa (inst, stream); |
| 244 | fprintf (stream, ",%s", lit(i)); |
| 245 | return pfx + l; |
| 246 | |
| 247 | case a2r: /* register, memory */ |
| 248 | fprintf (stream, "%s,", reg(i,k)); |
| 249 | return pfx + print_effa (inst, stream); |
| 250 | |
| 251 | case a2l: /* literal, memory */ |
| 252 | fprintf (stream, "%s,", lit(i)); |
| 253 | return pfx + print_effa (inst, stream); |
| 254 | |
| 255 | case a3: /* memory */ |
| 256 | return pfx + print_effa (inst, stream); |
| 257 | |
| 258 | case a4: /* system call */ |
| 259 | l = 29; goto a4a5; |
| 260 | case a5: /* trap */ |
| 261 | l = 27; |
| 262 | a4a5: |
| 263 | if (inst.f1.len) |
| 264 | { |
| 265 | unsigned int m = (inst.signed_half[1] << 16) + inst.half[2]; |
| 266 | fprintf (stream, "#%d,#%d", m >> l, m & (-1 >> (32-l))); |
| 267 | return pfx + 6; |
| 268 | } |
| 269 | else |
| 270 | { |
| 271 | unsigned int m = inst.signed_half[1]; |
| 272 | fprintf (stream, "#%d,#%d", m >> l, m & (-1 >> (32-l))); |
| 273 | return pfx + 4; |
| 274 | } |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | |
| 279 | /* print effective address @nnn(aj), return instruction length */ |
| 280 | |
| 281 | int print_effa (inst, stream) |
| 282 | union inst inst; |
| 283 | FILE *stream; |
| 284 | { |
| 285 | int n, l; |
| 286 | |
| 287 | if (inst.f1.len) |
| 288 | { |
| 289 | n = (inst.signed_half[1] << 16) + inst.half[2]; |
| 290 | l = 6; |
| 291 | } |
| 292 | else |
| 293 | { |
| 294 | n = inst.signed_half[1]; |
| 295 | l = 4; |
| 296 | } |
| 297 | |
| 298 | if (inst.f1.indir) |
| 299 | printf ("@"); |
| 300 | |
| 301 | if (!inst.f1.j) |
| 302 | { |
| 303 | print_address (n, stream); |
| 304 | return l; |
| 305 | } |
| 306 | |
| 307 | fprintf (stream, (n & 0xf0000000) == 0x80000000 ? "%#x(%s)" : "%d(%s)", |
| 308 | n, aj[inst.f1.j]); |
| 309 | |
| 310 | return l; |
| 311 | } |