int parse_instruction_NAME(struct _asm_context *asm_context, char *instr)
{
char token[TOKENLEN];
int token_type;
char instr_case[TOKENLEN];
int n;
lower_copy(instr_case, instr);
//token_type=get_token(asm_context, token, TOKENLEN);
//pushback(asm_context, token, token_type);
print_error_unknown_instr(instr, asm_context);
return -1;
}
int parse_instruction_mips(struct _asm_context *asm_context, char *instr)
{
struct _operand operands[3];
int operand_count = 0;
char token[TOKENLEN];
int token_type;
char instr_case[TOKENLEN];
int paren_flag;
int num,n,r;
int opcode;
#if 0
int n,cond,s=0;
int opcode=0;
#endif
lower_copy(instr_case, instr);
memset(operands, 0, sizeof(operands));
//printf("%s %s\n", instr_case, instr);
while(1)
{
token_type = tokens_get(asm_context, token, TOKENLEN);
if (token_type == TOKEN_EOL) { break; }
//printf("token=%s token_type=%d\n", token, token_type);
if (operand_count == 0 && IS_TOKEN(token,'.'))
{
strcat(instr_case, ".");
strcat(instr, ".");
token_type = tokens_get(asm_context, token, TOKENLEN);
strcat(instr, token);
n = 0;
while(token[n] != 0) { token[n]=tolower(token[n]); n++; }
strcat(instr_case, token);
continue;
}
do
{
paren_flag = 0;
if (IS_TOKEN(token,'('))
{
token_type = tokens_get(asm_context, token, TOKENLEN);
paren_flag = 1;
}
num = get_register_mips(token, 't');
if (num != -1)
{
operands[operand_count].value = num;
operands[operand_count].type = OPERAND_TREG;
if (paren_flag == 0) { break; }
}
else
if (paren_flag == 0)
{
num = get_register_mips(token, 'f');
if (num != -1)
{
operands[operand_count].value = num;
operands[operand_count].type = OPERAND_FREG;
break;
}
}
if (paren_flag == 1)
{
token_type = tokens_get(asm_context, token, TOKENLEN);
if (IS_NOT_TOKEN(token,')'))
{
print_error_unexp(token, asm_context);
return -1;
}
operands[operand_count].reg2 = operands[operand_count].value;
operands[operand_count].value = 0;
operands[operand_count].type = OPERAND_IMMEDIATE_RS;;
break;
}
operands[operand_count].type = OPERAND_IMMEDIATE;
if (asm_context->pass == 1)
{
eat_operand(asm_context);
break;
}
tokens_push(asm_context, token, token_type);
if (eval_expression(asm_context, &num) != 0)
{
print_error_unexp(token, asm_context);
return -1;
}
operands[operand_count].value = num;
token_type = tokens_get(asm_context, token, TOKENLEN);
if (IS_TOKEN(token,'('))
{
token_type = tokens_get(asm_context, token, TOKENLEN);
num = get_register_mips(token, 't');
if (num == -1)
{
print_error_unexp(token, asm_context);
return -1;
}
operands[operand_count].reg2 = num;
operands[operand_count].type = OPERAND_IMMEDIATE_RS;;
token_type = tokens_get(asm_context, token, TOKENLEN);
if (IS_NOT_TOKEN(token,')'))
{
print_error_unexp(token, asm_context);
return -1;
}
}
else
{
tokens_push(asm_context, token, token_type);
}
} while(0);
operand_count++;
token_type = tokens_get(asm_context, token, TOKENLEN);
if (token_type == TOKEN_EOL) { break; }
if (IS_NOT_TOKEN(token,','))
{
print_error_unexp(token, asm_context);
return -1;
}
if (operand_count == 3)
{
print_error_unexp(token, asm_context);
return -1;
}
}
if (asm_context->pass == 1)
{
add_bin32(asm_context, 0, IS_OPCODE);
return 4;
}
// Check pseudo-instructions
if (strcmp(instr_case, "move") == 0 && operand_count == 2)
{
strcpy(instr_case, "add");
operands[operand_count].value = 0;
operands[operand_count].type = OPERAND_TREG;;
operand_count++;
}
else
#if 0
if (strcmp(instr_case, "li") == 0 && operand_count == 2)
{
strcpy(instr_case, "addi");
memcpy(&operands[operand_count], &operands[operand_count-1], sizeof(struct _operand));
operands[operand_count-1].value = 0;
operands[operand_count-1].reg2 = 0;
operands[operand_count-1].type = OPERAND_TREG;;
operand_count++;
}
else
#endif
if (strcmp(instr_case, "nop") == 0 && operand_count == 0)
{
strcpy(instr_case, "add");
operand_count = 3;
}
else
if (strcmp(instr_case, "neg") == 0 && operand_count == 1)
{
strcpy(instr_case, "subu");
memcpy(&operands[1], &operands[0], sizeof(struct _operand));
operand_count = 3;
}
// R-Type Instruction [ op 6, rs 5, rt 5, rd 5, sa 5, function 6 ]
n = 0;
while(mips_r_table[n].instr != NULL)
{
if (strcmp(instr_case, mips_r_table[n].instr) == 0)
{
char shift_table[] = { 0, 11, 21, 16, 6 };
if (mips_r_table[n].operand_count != operand_count)
{
print_error_illegal_operands(instr, asm_context);
return -1;
}
opcode = mips_r_table[n].function;
for (r = 0; r < operand_count; r++)
{
if (operands[r].type != OPERAND_TREG)
{
//printf("%s %s %s\n", instr_case, mips_r_table[n].instr, instr);
printf("Error: '%s' expects registers at %s:%d\n", instr, asm_context->filename, asm_context->line);
return -1;
}
//printf("%s %d<<%d\n", instr, operands[r].value, shift_table[(int)mips_r_table[n].operand[r]]);
opcode |= operands[r].value << shift_table[(int)mips_r_table[n].operand[r]];
}
add_bin32(asm_context, opcode, IS_OPCODE);
return 4;
}
n++;
}
// J-Type Instruction [ op 6, target 26 ]
if (strcmp(instr_case, "ja") == 0 || strcmp(instr_case, "jal") == 0)
{
// FIXME - what to do with this
//unsigned int upper = (address + 4) & 0xf0000000;
if (operand_count != 1)
{
print_error_illegal_operands(instr, asm_context);
return -1;
}
if (operands[0].type != OPERAND_IMMEDIATE)
{
printf("Error: Expecting address for '%s' at %s:%d\n", instr, asm_context->filename, asm_context->line);
return -1;
}
if (instr_case[2] == 'l') { opcode = 2 << 26; }
else { opcode = 3 << 26; }
add_bin32(asm_context, opcode | operands[0].value >> 2, IS_OPCODE);
return 4;
}
// Coprocessor Instruction [ op 6, format 5, ft 5, fs 5, fd 5, funct 6 ]
n = 0;
while(mips_cop_table[n].instr != NULL)
{
if (strcmp(instr_case, mips_cop_table[n].instr) == 0)
{
char shift_table[] = { 0, 5, 11, 16 };
if (mips_cop_table[n].operand_count != operand_count)
{
print_error_illegal_operands(instr, asm_context);
return -1;
}
opcode = (0x11 << 26) | (mips_cop_table[n].format << 21) | mips_cop_table[n].function;
for (r = 0; r < operand_count; r++)
{
if (operands[r].type != OPERAND_FREG)
{
printf("Error: '%s' expects registers at %s:%d\n", instr, asm_context->filename, asm_context->line);
return -1;
}
opcode |= operands[r].value << shift_table[(int)mips_cop_table[n].operand[r]];
}
add_bin32(asm_context, opcode, IS_OPCODE);
return 4;
}
n++;
}
// I-Type? [ op 6, rs 5, rt 5, imm 16 ]
n = 0;
while(mips_i_table[n].instr != NULL)
{
if (strcmp(instr_case, mips_i_table[n].instr) == 0)
{
char shift_table[] = { 0, 0, 21, 16 };
if (mips_i_table[n].operand_count != operand_count)
{
print_error_opcount(instr, asm_context);
return -1;
}
opcode = mips_i_table[n].function << 26;
for (r = 0; r < mips_i_table[n].operand_count; r++)
{
if ((mips_i_table[n].operand[r] == MIPS_OP_RT ||
mips_i_table[n].operand[r] == MIPS_OP_RS) &&
operands[r].type == OPERAND_TREG)
{
opcode |= operands[r].value << shift_table[(int)mips_i_table[n].operand[r]];
}
else
if (mips_i_table[n].operand[r] == MIPS_OP_LABEL)
{
// FIXME - Calculate address
//if (operands[r].value > 65535 || operands[r].value < -32768)
//{
// print_error("Constant larger than 16 bit.", asm_context);
// return -1;
//}
opcode |= operands[r].value;
}
else
if (mips_i_table[n].operand[r] == MIPS_OP_IMMEDIATE)
{
if (operands[r].value > 65535 || operands[r].value < -32768)
{
print_error("Constant larger than 16 bit.", asm_context);
return -1;
}
opcode |= operands[r].value;
}
else
if (mips_i_table[n].operand[r] == MIPS_OP_IMMEDIATE_RS)
{
if (operands[r].value > 65535 || operands[r].value < -32768)
{
print_error("Constant larger than 16 bit.", asm_context);
return -1;
}
opcode |= operands[r].value;
opcode |= operands[r].reg2 << 21;
}
else
if (mips_i_table[n].operand[r] == MIPS_OP_RT_IS_0)
{
// Derr
}
else
if (mips_i_table[n].operand[r] == MIPS_OP_RT_IS_1)
{
opcode |= 1 << 16;
}
else
{
print_error_illegal_operands(instr, asm_context);
return -1;
}
opcode |= operands[r].value << shift_table[(int)mips_i_table[n].operand[r]];
}
add_bin32(asm_context, opcode, IS_OPCODE);
return 4;
}
n++;
}
print_error_unknown_instr(instr, asm_context);
return -1;
}
