disas/lm32.c

   1 /*
   2  *  Simple LatticeMico32 disassembler.
   3  *
   4  *  Copyright (c) 2012 Michael Walle <michael@walle.cc>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include <stdio.h>
  22 #include "disas/bfd.h"
  23
  24 typedef enum {
  25     LM32_OP_SRUI = 0, LM32_OP_NORI, LM32_OP_MULI, LM32_OP_SH, LM32_OP_LB,
  26     LM32_OP_SRI, LM32_OP_XORI, LM32_OP_LH, LM32_OP_ANDI, LM32_OP_XNORI,
  27     LM32_OP_LW, LM32_OP_LHU, LM32_OP_SB, LM32_OP_ADDI, LM32_OP_ORI,
  28     LM32_OP_SLI, LM32_OP_LBU, LM32_OP_BE, LM32_OP_BG, LM32_OP_BGE,
  29     LM32_OP_BGEU, LM32_OP_BGU, LM32_OP_SW, LM32_OP_BNE, LM32_OP_ANDHI,
  30     LM32_OP_CMPEI, LM32_OP_CMPGI, LM32_OP_CMPGEI, LM32_OP_CMPGEUI,
  31     LM32_OP_CMPGUI, LM32_OP_ORHI, LM32_OP_CMPNEI, LM32_OP_SRU, LM32_OP_NOR,
  32     LM32_OP_MUL, LM32_OP_DIVU, LM32_OP_RCSR, LM32_OP_SR, LM32_OP_XOR,
  33     LM32_OP_ILL0, LM32_OP_AND, LM32_OP_XNOR, LM32_OP_ILL1, LM32_OP_SCALL,
  34     LM32_OP_SEXTB, LM32_OP_ADD, LM32_OP_OR, LM32_OP_SL, LM32_OP_B,
  35     LM32_OP_MODU, LM32_OP_SUB, LM32_OP_ILL2, LM32_OP_WCSR, LM32_OP_ILL3,
  36     LM32_OP_CALL, LM32_OP_SEXTH, LM32_OP_BI, LM32_OP_CMPE, LM32_OP_CMPG,
  37     LM32_OP_CMPGE, LM32_OP_CMPGEU, LM32_OP_CMPGU, LM32_OP_CALLI, LM32_OP_CMPNE,
  38 } Lm32Opcode;
  39
  40 typedef enum {
  41     FMT_INVALID = 0, FMT_RRI5, FMT_RRI16, FMT_IMM26, FMT_LOAD, FMT_STORE,
  42     FMT_RRR, FMT_R, FMT_RNR, FMT_CRN, FMT_CNR, FMT_BREAK,
  43 } Lm32OpcodeFmt;
  44
  45 typedef enum {
  46     LM32_CSR_IE = 0, LM32_CSR_IM, LM32_CSR_IP, LM32_CSR_ICC, LM32_CSR_DCC,
  47     LM32_CSR_CC, LM32_CSR_CFG, LM32_CSR_EBA, LM32_CSR_DC, LM32_CSR_DEBA,
  48     LM32_CSR_CFG2, LM32_CSR_JTX = 0xe, LM32_CSR_JRX, LM32_CSR_BP0,
  49     LM32_CSR_BP1, LM32_CSR_BP2, LM32_CSR_BP3, LM32_CSR_WP0 = 0x18,
  50     LM32_CSR_WP1, LM32_CSR_WP2, LM32_CSR_WP3,
  51 } Lm32CsrNum;
  52
  53 typedef struct {
  54     int csr;
  55     const char *name;
  56 } Lm32CsrInfo;
  57
  58 static const Lm32CsrInfo lm32_csr_info[] = {
  59     {LM32_CSR_IE,   "ie", },
  60     {LM32_CSR_IM,   "im", },
  61     {LM32_CSR_IP,   "ip", },
  62     {LM32_CSR_ICC,  "icc", },
  63     {LM32_CSR_DCC,  "dcc", },
  64     {LM32_CSR_CC,   "cc", },
  65     {LM32_CSR_CFG,  "cfg", },
  66     {LM32_CSR_EBA,  "eba", },
  67     {LM32_CSR_DC,   "dc", },
  68     {LM32_CSR_DEBA, "deba", },
  69     {LM32_CSR_CFG2, "cfg2", },
  70     {LM32_CSR_JTX,  "jtx", },
  71     {LM32_CSR_JRX,  "jrx", },
  72     {LM32_CSR_BP0,  "bp0", },
  73     {LM32_CSR_BP1,  "bp1", },
  74     {LM32_CSR_BP2,  "bp2", },
  75     {LM32_CSR_BP3,  "bp3", },
  76     {LM32_CSR_WP0,  "wp0", },
  77     {LM32_CSR_WP1,  "wp1", },
  78     {LM32_CSR_WP2,  "wp2", },
  79     {LM32_CSR_WP3,  "wp3", },
  80 };
  81
  82 static const Lm32CsrInfo *find_csr_info(int csr)
  83 {
  84     const Lm32CsrInfo *info;
  85     int i;
  86
  87     for (i = 0; i < ARRAY_SIZE(lm32_csr_info); i++) {
  88         info = &lm32_csr_info[i];
  89         if (csr == info->csr) {
  90             return info;
  91         }
  92     }
  93
  94     return NULL;
  95 }
  96
  97 typedef struct {
  98     int reg;
  99     const char *name;
 100 } Lm32RegInfo;
 101
 102 typedef enum {
 103     LM32_REG_R0 = 0, LM32_REG_R1, LM32_REG_R2, LM32_REG_R3, LM32_REG_R4,
 104     LM32_REG_R5, LM32_REG_R6, LM32_REG_R7, LM32_REG_R8, LM32_REG_R9,
 105     LM32_REG_R10, LM32_REG_R11, LM32_REG_R12, LM32_REG_R13, LM32_REG_R14,
 106     LM32_REG_R15, LM32_REG_R16, LM32_REG_R17, LM32_REG_R18, LM32_REG_R19,
 107     LM32_REG_R20, LM32_REG_R21, LM32_REG_R22, LM32_REG_R23, LM32_REG_R24,
 108     LM32_REG_R25, LM32_REG_GP, LM32_REG_FP, LM32_REG_SP, LM32_REG_RA,
 109     LM32_REG_EA, LM32_REG_BA,
 110 } Lm32RegNum;
 111
 112 static const Lm32RegInfo lm32_reg_info[] = {
 113     {LM32_REG_R0,  "r0", },
 114     {LM32_REG_R1,  "r1", },
 115     {LM32_REG_R2,  "r2", },
 116     {LM32_REG_R3,  "r3", },
 117     {LM32_REG_R4,  "r4", },
 118     {LM32_REG_R5,  "r5", },
 119     {LM32_REG_R6,  "r6", },
 120     {LM32_REG_R7,  "r7", },
 121     {LM32_REG_R8,  "r8", },
 122     {LM32_REG_R9,  "r9", },
 123     {LM32_REG_R10, "r10", },
 124     {LM32_REG_R11, "r11", },
 125     {LM32_REG_R12, "r12", },
 126     {LM32_REG_R13, "r13", },
 127     {LM32_REG_R14, "r14", },
 128     {LM32_REG_R15, "r15", },
 129     {LM32_REG_R16, "r16", },
 130     {LM32_REG_R17, "r17", },
 131     {LM32_REG_R18, "r18", },
 132     {LM32_REG_R19, "r19", },
 133     {LM32_REG_R20, "r20", },
 134     {LM32_REG_R21, "r21", },
 135     {LM32_REG_R22, "r22", },
 136     {LM32_REG_R23, "r23", },
 137     {LM32_REG_R24, "r24", },
 138     {LM32_REG_R25, "r25", },
 139     {LM32_REG_GP,  "gp", },
 140     {LM32_REG_FP,  "fp", },
 141     {LM32_REG_SP,  "sp", },
 142     {LM32_REG_RA,  "ra", },
 143     {LM32_REG_EA,  "ea", },
 144     {LM32_REG_BA,  "ba", },
 145 };
 146
 147 static const Lm32RegInfo *find_reg_info(int reg)
 148 {
 149     assert(ARRAY_SIZE(lm32_reg_info) == 32);
 150     return &lm32_reg_info[reg & 0x1f];
 151 }
 152
 153 typedef struct {
 154     struct {
 155         uint32_t code;
 156         uint32_t mask;
 157     } op;
 158     const char *name;
 159     const char *args_fmt;
 160 } Lm32OpcodeInfo;
 161
 162 static const Lm32OpcodeInfo lm32_opcode_info[] = {
 163     /* pseudo instructions */
 164     {{0x34000000, 0xffffffff}, "nop",   NULL},
 165     {{0xac000002, 0xffffffff}, "break", NULL},
 166     {{0xac000003, 0xffffffff}, "scall", NULL},
 167     {{0xc3e00000, 0xffffffff}, "bret",  NULL},
 168     {{0xc3c00000, 0xffffffff}, "eret",  NULL},
 169     {{0xc3a00000, 0xffffffff}, "ret",   NULL},
 170     {{0xa4000000, 0xfc1f07ff}, "not",   "%2, %0"},
 171     {{0xb8000000, 0xfc1f07ff}, "mv",    "%2, %0"},
 172     {{0x71e00000, 0xffe00000}, "mvhi",  "%1, %u"},
 173     {{0x34000000, 0xffe00000}, "mvi",   "%1, %s"},
 174
 175 #define _O(op) {op << 26, 0x3f << 26}
 176     /* regular opcodes */
 177     {_O(LM32_OP_ADD),     "add",     "%2, %0, %1"  },
 178     {_O(LM32_OP_ADDI),    "addi",    "%1, %0, %s"  },
 179     {_O(LM32_OP_AND),     "and",     "%2, %0, %1"  },
 180     {_O(LM32_OP_ANDHI),   "andhi",   "%1, %0, %u"  },
 181     {_O(LM32_OP_ANDI),    "andi",    "%1, %0, %u"  },
 182     {_O(LM32_OP_B),       "b",       "%0",         },
 183     {_O(LM32_OP_BE),      "be",      "%1, %0, %r"  },
 184     {_O(LM32_OP_BG),      "bg",      "%1, %0, %r"  },
 185     {_O(LM32_OP_BGE),     "bge",     "%1, %0, %r"  },
 186     {_O(LM32_OP_BGEU),    "bgeu",    "%1, %0, %r"  },
 187     {_O(LM32_OP_BGU),     "bgu",     "%1, %0, %r"  },
 188     {_O(LM32_OP_BI),      "bi",      "%R",         },
 189     {_O(LM32_OP_BNE),     "bne",     "%1, %0, %r"  },
 190     {_O(LM32_OP_CALL),    "call",    "%0",         },
 191     {_O(LM32_OP_CALLI),   "calli",   "%R",         },
 192     {_O(LM32_OP_CMPE),    "cmpe",    "%2, %0, %1"  },
 193     {_O(LM32_OP_CMPEI),   "cmpei",   "%1, %0, %s"  },
 194     {_O(LM32_OP_CMPG),    "cmpg",    "%2, %0, %1"  },
 195     {_O(LM32_OP_CMPGE),   "cmpge",   "%2, %0, %1"  },
 196     {_O(LM32_OP_CMPGEI),  "cmpgei",  "%1, %0, %s"  },
 197     {_O(LM32_OP_CMPGEU),  "cmpgeu",  "%2, %0, %1"  },
 198     {_O(LM32_OP_CMPGEUI), "cmpgeui", "%1, %0, %s"  },
 199     {_O(LM32_OP_CMPGI),   "cmpgi",   "%1, %0, %s"  },
 200     {_O(LM32_OP_CMPGU),   "cmpgu",   "%2, %0, %1"  },
 201     {_O(LM32_OP_CMPGUI),  "cmpgui",  "%1, %0, %s"  },
 202     {_O(LM32_OP_CMPNE),   "cmpne",   "%2, %0, %1"  },
 203     {_O(LM32_OP_CMPNEI),  "cmpnei",  "%1, %0, %s"  },
 204     {_O(LM32_OP_DIVU),    "divu",    "%2, %0, %1"  },
 205     {_O(LM32_OP_LB),      "lb",      "%1, (%0+%s)" },
 206     {_O(LM32_OP_LBU),     "lbu",     "%1, (%0+%s)" },
 207     {_O(LM32_OP_LH),      "lh",      "%1, (%0+%s)" },
 208     {_O(LM32_OP_LHU),     "lhu",     "%1, (%0+%s)" },
 209     {_O(LM32_OP_LW),      "lw",      "%1, (%0+%s)" },
 210     {_O(LM32_OP_MODU),    "modu",    "%2, %0, %1"  },
 211     {_O(LM32_OP_MULI),    "muli",    "%1, %0, %s"  },
 212     {_O(LM32_OP_MUL),     "mul",     "%2, %0, %1"  },
 213     {_O(LM32_OP_NORI),    "nori",    "%1, %0, %u"  },
 214     {_O(LM32_OP_NOR),     "nor",     "%2, %0, %1"  },
 215     {_O(LM32_OP_ORHI),    "orhi",    "%1, %0, %u"  },
 216     {_O(LM32_OP_ORI),     "ori",     "%1, %0, %u"  },
 217     {_O(LM32_OP_OR),      "or",      "%2, %0, %1"  },
 218     {_O(LM32_OP_RCSR),    "rcsr",    "%2, %c",     },
 219     {_O(LM32_OP_SB),      "sb",      "(%0+%s), %1" },
 220     {_O(LM32_OP_SEXTB),   "sextb",   "%2, %0",     },
 221     {_O(LM32_OP_SEXTH),   "sexth",   "%2, %0",     },
 222     {_O(LM32_OP_SH),      "sh",      "(%0+%s), %1" },
 223     {_O(LM32_OP_SLI),     "sli",     "%1, %0, %h"  },
 224     {_O(LM32_OP_SL),      "sl",      "%2, %0, %1"  },
 225     {_O(LM32_OP_SRI),     "sri",     "%1, %0, %h"  },
 226     {_O(LM32_OP_SR),      "sr",      "%2, %0, %1"  },
 227     {_O(LM32_OP_SRUI),    "srui",    "%1, %0, %d"  },
 228     {_O(LM32_OP_SRU),     "sru",     "%2, %0, %s"  },
 229     {_O(LM32_OP_SUB),     "sub",     "%2, %0, %s"  },
 230     {_O(LM32_OP_SW),      "sw",      "(%0+%s), %1" },
 231     {_O(LM32_OP_WCSR),    "wcsr",    "%c, %1",     },
 232     {_O(LM32_OP_XNORI),   "xnori",   "%1, %0, %u"  },
 233     {_O(LM32_OP_XNOR),    "xnor",    "%2, %0, %1"  },
 234     {_O(LM32_OP_XORI),    "xori",    "%1, %0, %u"  },
 235     {_O(LM32_OP_XOR),     "xor",     "%2, %0, %1"  },
 236 #undef _O
 237 };
 238
 239 static const Lm32OpcodeInfo *find_opcode_info(uint32_t opcode)
 240 {
 241     const Lm32OpcodeInfo *info;
 242     int i;
 243     for (i = 0; i < ARRAY_SIZE(lm32_opcode_info); i++) {
 244         info = &lm32_opcode_info[i];
 245         if ((opcode & info->op.mask) == info->op.code) {
 246             return info;
 247         }
 248     }
 249
 250     return NULL;
 251 }
 252
 253 int print_insn_lm32(bfd_vma memaddr, struct disassemble_info *info)
 254 {
 255     fprintf_function fprintf_fn = info->fprintf_func;
 256     void *stream = info->stream;
 257     int rc;
 258     uint8_t insn[4];
 259     const Lm32OpcodeInfo *opc_info;
 260     uint32_t op;
 261     const char *args_fmt;
 262
 263     rc = info->read_memory_func(memaddr, insn, 4, info);
 264     if (rc != 0) {
 265         info->memory_error_func(rc, memaddr, info);
 266         return -1;
 267     }
 268
 269     fprintf_fn(stream, "%02x %02x %02x %02x    ",
 270             insn[0], insn[1], insn[2], insn[3]);
 271
 272     op = bfd_getb32(insn);
 273     opc_info = find_opcode_info(op);
 274     if (opc_info) {
 275         fprintf_fn(stream, "%-8s ", opc_info->name);
 276         args_fmt = opc_info->args_fmt;
 277         while (args_fmt && *args_fmt) {
 278             if (*args_fmt == '%') {
 279                 switch (*(++args_fmt)) {
 280                 case '0': {
 281                     uint8_t r0;
 282                     const char *r0_name;
 283                     r0 = (op >> 21) & 0x1f;
 284                     r0_name = find_reg_info(r0)->name;
 285                     fprintf_fn(stream, "%s", r0_name);
 286                     break;
 287                 }
 288                 case '1': {
 289                     uint8_t r1;
 290                     const char *r1_name;
 291                     r1 = (op >> 16) & 0x1f;
 292                     r1_name = find_reg_info(r1)->name;
 293                     fprintf_fn(stream, "%s", r1_name);
 294                     break;
 295                 }
 296                 case '2': {
 297                     uint8_t r2;
 298                     const char *r2_name;
 299                     r2 = (op >> 11) & 0x1f;
 300                     r2_name = find_reg_info(r2)->name;
 301                     fprintf_fn(stream, "%s", r2_name);
 302                     break;
 303                 }
 304                 case 'c': {
 305                     uint8_t csr;
 306                     const Lm32CsrInfo *info;
 307                     csr = (op >> 21) & 0x1f;
 308                     info = find_csr_info(csr);
 309                     if (info) {
 310                         fprintf_fn(stream, "%s", info->name);
 311                     } else {
 312                         fprintf_fn(stream, "0x%x", csr);
 313                     }
 314                     break;
 315                 }
 316                 case 'u': {
 317                     uint16_t u16;
 318                     u16 = op & 0xffff;
 319                     fprintf_fn(stream, "0x%x", u16);
 320                     break;
 321                 }
 322                 case 's': {
 323                     int16_t s16;
 324                     s16 = (int16_t)(op & 0xffff);
 325                     fprintf_fn(stream, "%d", s16);
 326                     break;
 327                 }
 328                 case 'r': {
 329                     uint32_t rela;
 330                     rela = memaddr + (((int16_t)(op & 0xffff)) << 2);
 331                     fprintf_fn(stream, "%x", rela);
 332                     break;
 333                 }
 334                 case 'R': {
 335                     uint32_t rela;
 336                     int32_t imm26;
 337                     imm26 = (int32_t)((op & 0x3ffffff) << 6) >> 4;
 338                     rela = memaddr + imm26;
 339                     fprintf_fn(stream, "%x", rela);
 340                     break;
 341                 }
 342                 case 'h': {
 343                     uint8_t u5;
 344                     u5 = (op & 0x1f);
 345                     fprintf_fn(stream, "%d", u5);
 346                     break;
 347                 }
 348                 default:
 349                     break;
 350                 }
 351             } else {
 352                 fprintf_fn(stream, "%c", *args_fmt);
 353             }
 354             args_fmt++;
 355         }
 356     } else {
 357         fprintf_fn(stream, ".word 0x%x", op);
 358     }
 359
 360     return 4;
 361 }