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1-2: Accumulator and RM_TF_M MOD 00 R/M 110

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Hane 2026-01-25 01:40:07 +01:00
commit 15286389ad
2 changed files with 54 additions and 2 deletions
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1-2/8086coded
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1-2/decoder.c
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@ -63,6 +63,48 @@ typedef struct
FILE *output; FILE *output;
binary_data bin; binary_data bin;
int MOV_MA_T_AM_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_read, bool is_M_T_A)
{
const uint8_t wide_mask = 0b0000'0001;
uint8_t extra_bytes_read;
unsigned char byte[1];
uint8_t acc_wide = 0;
uint8_t high_addr = 0;
uint16_t word_addr = byte2;
int disp_len = 0;
char ea_string[18] = {'\0'};
char *ea_string_write_ptr = ea_string;
//Immediate value retrieval
if (wide_mask & byte1)
{
fread(byte, sizeof(byte), 1, bin.binary);
extra_bytes_read++;
high_addr = (uint8_t)byte[0];
word_addr = word_addr + (high_addr << 8);
}
//target reg retrieval
acc_wide = (((byte1 & wide_mask)) * 8);
//Stringify address
//EA STRING GENERATION
*ea_string_write_ptr = '[';
ea_string_write_ptr++;
disp_len = sprintf(ea_string_write_ptr, "%d", word_addr);
ea_string_write_ptr += disp_len;
*ea_string_write_ptr = ']';
//END
printf("%s %s, %s\n", "mov", is_M_T_A ? REG_ENCODING_TXT[acc_wide] : ea_string,
is_M_T_A ? ea_string : REG_ENCODING_TXT[acc_wide]);
fprintf(output, "%s %s, %s\n", "mov", is_M_T_A ? REG_ENCODING_TXT[acc_wide] : ea_string,
is_M_T_A ? ea_string : REG_ENCODING_TXT[acc_wide]);
return extra_bytes_read;
}
int MOV_I_T_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_read) int MOV_I_T_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_read)
{ {
const uint8_t wide_mask = 0b0000'1000; const uint8_t wide_mask = 0b0000'1000;
@ -266,8 +308,18 @@ int main(int argc, char** argv)
fread(byte, sizeof(byte), 1, bin.binary); fread(byte, sizeof(byte), 1, bin.binary);
uint8_t manip_inst = (uint8_t)byte[0]; uint8_t manip_inst = (uint8_t)byte[0];
uint8_t inst = (uint8_t)byte[0]; uint8_t inst = (uint8_t)byte[0];
//We're checking for MOV RM_TF_R and MOV I_T_R //We're checking for all MOV except segment registers
manip_inst = (manip_inst >> 2); manip_inst = (manip_inst >> 1);
if (manip_inst == MOV_M_T_A || manip_inst == MOV_A_T_M)
{
if (bytes_read >= bin.size) break;
fread(byte, sizeof(byte), 1, bin.binary);
bytes_read++;
uint8_t inst_byte2 = (uint8_t)byte[0];
bytes_read += MOV_MA_T_AM_parse(inst, inst_byte2, 0, 0, (manip_inst == MOV_M_T_A));
continue;
}
manip_inst = (manip_inst >> 1);
if (manip_inst == MOV_RM_TF_R) if (manip_inst == MOV_RM_TF_R)
{ {
if (bytes_read >= bin.size) break; if (bytes_read >= bin.size) break;