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[/] [eco32/] [trunk/] [sim/] [instr.c] - Rev 86
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/* * instr.c -- instruction encoding */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "common.h" #include "console.h" #include "error.h" #include "instr.h" /* * This is the ECO32 machine instruction set. * The table below needs no particular order * and may have gaps in the instruction encoding. */ Instr instrTbl[] = { { "add", FORMAT_RRY, OP_ADD }, { "sub", FORMAT_RRY, OP_SUB }, { "mul", FORMAT_RRY, OP_MUL }, { "mulu", FORMAT_RRX, OP_MULU }, { "div", FORMAT_RRY, OP_DIV }, { "divu", FORMAT_RRX, OP_DIVU }, { "rem", FORMAT_RRY, OP_REM }, { "remu", FORMAT_RRX, OP_REMU }, { "and", FORMAT_RRX, OP_AND }, { "or", FORMAT_RRX, OP_OR }, { "xor", FORMAT_RRX, OP_XOR }, { "xnor", FORMAT_RRX, OP_XNOR }, { "sll", FORMAT_RRX, OP_SLL }, { "slr", FORMAT_RRX, OP_SLR }, { "sar", FORMAT_RRX, OP_SAR }, { "ldhi", FORMAT_RHH, OP_LDHI }, { "beq", FORMAT_RRB, OP_BEQ }, { "bne", FORMAT_RRB, OP_BNE }, { "ble", FORMAT_RRB, OP_BLE }, { "bleu", FORMAT_RRB, OP_BLEU }, { "blt", FORMAT_RRB, OP_BLT }, { "bltu", FORMAT_RRB, OP_BLTU }, { "bge", FORMAT_RRB, OP_BGE }, { "bgeu", FORMAT_RRB, OP_BGEU }, { "bgt", FORMAT_RRB, OP_BGT }, { "bgtu", FORMAT_RRB, OP_BGTU }, { "j", FORMAT_J, OP_J }, { "jr", FORMAT_JR, OP_JR }, { "jal", FORMAT_J, OP_JAL }, { "jalr", FORMAT_JR, OP_JALR }, { "trap", FORMAT_N, OP_TRAP }, { "rfx", FORMAT_N, OP_RFX }, { "ldw", FORMAT_RRS, OP_LDW }, { "ldh", FORMAT_RRS, OP_LDH }, { "ldhu", FORMAT_RRS, OP_LDHU }, { "ldb", FORMAT_RRS, OP_LDB }, { "ldbu", FORMAT_RRS, OP_LDBU }, { "stw", FORMAT_RRS, OP_STW }, { "sth", FORMAT_RRS, OP_STH }, { "stb", FORMAT_RRS, OP_STB }, { "mvfs", FORMAT_RH, OP_MVFS }, { "mvts", FORMAT_RH, OP_MVTS }, { "tbs", FORMAT_N, OP_TBS }, { "tbwr", FORMAT_N, OP_TBWR }, { "tbri", FORMAT_N, OP_TBRI }, { "tbwi", FORMAT_N, OP_TBWI } }; Instr *instrCodeTbl[64]; static int instrCompare(const void *instr1, const void *instr2) { return strcmp(((Instr *) instr1)->name, ((Instr *) instr2)->name); } void initInstrTable(void) { int i; /* first sort instruction table alphabetically */ qsort(instrTbl, sizeof(instrTbl)/sizeof(instrTbl[0]), sizeof(instrTbl[0]), instrCompare); /* then initialize instruction code table */ for (i = 0; i < 64; i++) { instrCodeTbl[i] = NULL; } for (i = 0; i < sizeof(instrTbl)/sizeof(instrTbl[0]); i++) { instrCodeTbl[instrTbl[i].opcode] = &instrTbl[i]; if (instrTbl[i].format == FORMAT_RRX || instrTbl[i].format == FORMAT_RRY) { /* enter the immediate variant of this instruction also */ instrCodeTbl[instrTbl[i].opcode + 1] = &instrTbl[i]; } } } Instr *lookupInstr(char *name) { int lo, hi, tst; int res; lo = 0; hi = sizeof(instrTbl) / sizeof(instrTbl[0]) - 1; while (lo <= hi) { tst = (lo + hi) / 2; res = strcmp(instrTbl[tst].name, name); if (res == 0) { return &instrTbl[tst]; } if (res < 0) { lo = tst + 1; } else { hi = tst - 1; } } return NULL; }
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