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1-2: Assignment complete w/o challenge

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Hane 2026-01-25 00:49:23 +01:00
commit 1a7041ab9d
6 changed files with 120 additions and 29 deletions
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1-2/8086coded
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100
1-2/decoder.c
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@ -30,29 +30,29 @@ char REG_ENCODING_TXT[0b10000][REG_ENCODING_TXT_LEN] = { "al", "cl", "dl", "bl",
char EA_ENCODING_TXT[0b1000][EA_ENCODING_TXT_LEN] = { "bx + si", "bx + di", "bp + si", "bp + di", char EA_ENCODING_TXT[0b1000][EA_ENCODING_TXT_LEN] = { "bx + si", "bx + di", "bp + si", "bp + di",
"si", "di", "bp", "bx"}; "si", "di", "bp", "bx"};
enum REG_ENCODING /* enum REG_ENCODING */
{ /* { */
R_AL = 0b000, /* R_AL = 0b000, */
R_CL = 0b001, /* R_CL = 0b001, */
R_DL = 0b010, /* R_DL = 0b010, */
R_BL = 0b011, /* R_BL = 0b011, */
R_AH = 0b100, /* R_AH = 0b100, */
R_CH = 0b101, /* R_CH = 0b101, */
R_DH = 0b110, /* R_DH = 0b110, */
R_BH = 0b111 /* R_BH = 0b111 */
}; /* }; */
enum WREG_ENCODING /* enum WREG_ENCODING */
{ /* { */
WR_AX = 0b000, /* WR_AX = 0b000, */
WR_CX = 0b001, /* WR_CX = 0b001, */
WR_DX = 0b010, /* WR_DX = 0b010, */
WR_BX = 0b011, /* WR_BX = 0b011, */
WR_SP = 0b100, /* WR_SP = 0b100, */
WR_BP = 0b101, /* WR_BP = 0b101, */
WR_SI = 0b110, /* WR_SI = 0b110, */
WR_DI = 0b111 /* WR_DI = 0b111 */
}; /* }; */
typedef struct typedef struct
{ {
@ -63,6 +63,35 @@ typedef struct
FILE *output; FILE *output;
binary_data bin; binary_data bin;
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 reg_mask = 0b0000'0111;
unsigned char byte[1];
uint8_t extra_bytes_read = 0;
uint16_t full_im = byte2;
uint8_t high_im = 0;
uint8_t reg_value = 0;
//Immediate value retrieval
if (wide_mask & byte1)
{
fread(byte, sizeof(byte), 1, bin.binary);
extra_bytes_read++;
high_im = (uint8_t)byte[0];
full_im = full_im + (high_im << 8);
}
//target reg retrieval
reg_value = (byte1 & reg_mask) + (((byte1 & wide_mask) >> 3) * 8);
printf("%s %s, %d\n", "mov", REG_ENCODING_TXT[reg_value], full_im);
fprintf(output, "%s %s, %d\n", "mov", REG_ENCODING_TXT[reg_value], full_im);
return extra_bytes_read;
}
int MOV_RM_TF_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_read) int MOV_RM_TF_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_read)
{ {
const uint8_t wide_mask = 0b0000'0001; const uint8_t wide_mask = 0b0000'0001;
@ -237,14 +266,27 @@ 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];
//For now we're just checking for RM_TF_R //We're checking for MOV RM_TF_R and MOV I_T_R
manip_inst = (manip_inst >> 2); manip_inst = (manip_inst >> 2);
if (manip_inst != MOV_RM_TF_R) break; if (manip_inst == MOV_RM_TF_R)
if (bytes_read >= bin.size) break; {
fread(byte, sizeof(byte), 1, bin.binary); if (bytes_read >= bin.size) break;
bytes_read++; fread(byte, sizeof(byte), 1, bin.binary);
uint8_t inst_byte2 = (uint8_t)byte[0]; bytes_read++;
bytes_read += MOV_RM_TF_R_parse(inst, inst_byte2, 0, 0); uint8_t inst_byte2 = (uint8_t)byte[0];
bytes_read += MOV_RM_TF_R_parse(inst, inst_byte2, 0, 0);
continue;
}
manip_inst = (manip_inst >> 2);
if (manip_inst == MOV_I_T_R)
{
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_I_T_R_parse(inst, inst_byte2, 0, 0);
continue;
}
} }
return 0; return 0;

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31
1-2/listing-39.asm Normal file
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@ -0,0 +1,31 @@
bits 16
; Register-to-register
mov si, bx
mov dh, al
; 8-bit immediate-to-register
mov cl, 12
mov ch, -12
; 16-bit immediate-to-register
mov cx, 12
mov cx, -12
mov dx, 3948
mov dx, -3948
; Source address calculation
mov al, [bx + si]
mov bx, [bp + di]
mov dx, [bp]
; Source address calculation plus 8-bit displacement
mov ah, [bx + si + 4]
; Source address calculation plus 16-bit displacement
mov al, [bx + si + 4999]
; Dest address calculation
mov [bx + di], cx
mov [bp + si], cl
mov [bp], ch

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1-2/output.asm Normal file
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@ -0,0 +1,18 @@
bits 16
mov si, bx
mov dh, al
mov cl, 12
mov ch, 244
mov cx, 12
mov cx, 65524
mov dx, 3948
mov dx, 61588
mov al, [bx + si]
mov bx, [bp + di]
mov dx, [bp + 0]
mov ah, [bx + si + 4]
mov al, [bx + si + 4999]
mov [bx + di], cx
mov [bp + si], cl
mov [bp + 0], ch