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[/] [eco32/] [trunk/] [sim/] [instr.c] - Blame information for rev 157

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Line No. Rev Author Line
1 8 hellwig
/*
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 * instr.c -- instruction encoding
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "common.h"
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#include "console.h"
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#include "error.h"
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#include "instr.h"
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/*
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 * This is the ECO32 machine instruction set.
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 * The table below needs no particular order
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 * and may have gaps in the instruction encoding.
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 */
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Instr instrTbl[] = {
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  { "add",   FORMAT_RRY, OP_ADD  },
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  { "sub",   FORMAT_RRY, OP_SUB  },
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  { "mul",   FORMAT_RRY, OP_MUL  },
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  { "mulu",  FORMAT_RRX, OP_MULU },
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  { "div",   FORMAT_RRY, OP_DIV  },
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  { "divu",  FORMAT_RRX, OP_DIVU },
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  { "rem",   FORMAT_RRY, OP_REM  },
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  { "remu",  FORMAT_RRX, OP_REMU },
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  { "and",   FORMAT_RRX, OP_AND  },
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  { "or",    FORMAT_RRX, OP_OR   },
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  { "xor",   FORMAT_RRX, OP_XOR  },
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  { "xnor",  FORMAT_RRX, OP_XNOR },
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  { "sll",   FORMAT_RRX, OP_SLL  },
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  { "slr",   FORMAT_RRX, OP_SLR  },
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  { "sar",   FORMAT_RRX, OP_SAR  },
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  { "ldhi",  FORMAT_RHH, OP_LDHI },
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  { "beq",   FORMAT_RRB, OP_BEQ  },
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  { "bne",   FORMAT_RRB, OP_BNE  },
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  { "ble",   FORMAT_RRB, OP_BLE  },
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  { "bleu",  FORMAT_RRB, OP_BLEU },
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  { "blt",   FORMAT_RRB, OP_BLT  },
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  { "bltu",  FORMAT_RRB, OP_BLTU },
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  { "bge",   FORMAT_RRB, OP_BGE  },
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  { "bgeu",  FORMAT_RRB, OP_BGEU },
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  { "bgt",   FORMAT_RRB, OP_BGT  },
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  { "bgtu",  FORMAT_RRB, OP_BGTU },
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  { "j",     FORMAT_J,   OP_J    },
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  { "jr",    FORMAT_JR,  OP_JR   },
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  { "jal",   FORMAT_J,   OP_JAL  },
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  { "jalr",  FORMAT_JR,  OP_JALR },
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  { "trap",  FORMAT_N,   OP_TRAP },
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  { "rfx",   FORMAT_N,   OP_RFX  },
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  { "ldw",   FORMAT_RRS, OP_LDW  },
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  { "ldh",   FORMAT_RRS, OP_LDH  },
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  { "ldhu",  FORMAT_RRS, OP_LDHU },
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  { "ldb",   FORMAT_RRS, OP_LDB  },
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  { "ldbu",  FORMAT_RRS, OP_LDBU },
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  { "stw",   FORMAT_RRS, OP_STW  },
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  { "sth",   FORMAT_RRS, OP_STH  },
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  { "stb",   FORMAT_RRS, OP_STB  },
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  { "mvfs",  FORMAT_RH,  OP_MVFS },
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  { "mvts",  FORMAT_RH,  OP_MVTS },
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  { "tbs",   FORMAT_N,   OP_TBS  },
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  { "tbwr",  FORMAT_N,   OP_TBWR },
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  { "tbri",  FORMAT_N,   OP_TBRI },
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  { "tbwi",  FORMAT_N,   OP_TBWI }
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};
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Instr *instrCodeTbl[64];
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static int instrCompare(const void *instr1, const void *instr2) {
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  return strcmp(((Instr *) instr1)->name, ((Instr *) instr2)->name);
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}
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void initInstrTable(void) {
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  int i;
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  /* first sort instruction table alphabetically */
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  qsort(instrTbl, sizeof(instrTbl)/sizeof(instrTbl[0]),
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        sizeof(instrTbl[0]), instrCompare);
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  /* then initialize instruction code table */
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  for (i = 0; i < 64; i++) {
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    instrCodeTbl[i] = NULL;
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  }
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  for (i = 0; i < sizeof(instrTbl)/sizeof(instrTbl[0]); i++) {
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    instrCodeTbl[instrTbl[i].opcode] = &instrTbl[i];
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    if (instrTbl[i].format == FORMAT_RRX ||
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        instrTbl[i].format == FORMAT_RRY) {
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      /* enter the immediate variant of this instruction also */
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      instrCodeTbl[instrTbl[i].opcode + 1] = &instrTbl[i];
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    }
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  }
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}
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Instr *lookupInstr(char *name) {
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  int lo, hi, tst;
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  int res;
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  lo = 0;
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  hi = sizeof(instrTbl) / sizeof(instrTbl[0]) - 1;
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  while (lo <= hi) {
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    tst = (lo + hi) / 2;
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    res = strcmp(instrTbl[tst].name, name);
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    if (res == 0) {
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      return &instrTbl[tst];
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    }
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    if (res < 0) {
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      lo = tst + 1;
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    } else {
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      hi = tst - 1;
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    }
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  }
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  return NULL;
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}

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