1-2 challenge solved (only impl in RM_TF_R)
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f984261641
commit
372364971c
7 changed files with 68 additions and 53 deletions
BIN
1-2/8086coded
BIN
1-2/8086coded
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@ -63,7 +63,7 @@ char WORD_SIGNAL_TXT[0b10][WORD_SIGNAL_LEN] = { "byte ", "word " };
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typedef struct
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{
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FILE *binary;
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uint64_t size;
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uint64_t size;
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} binary_data;
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FILE *output;
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@ -160,9 +160,19 @@ void fill_ea_string(output_string *str, char* content, int16_t displacement)
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{
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if (strlen(content) > 0)
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{
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memcpy(str->string, " + ", 3);
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str->string += 3;
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str->len += 3;
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*(str->string) = ' ';
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if(displacement >= 0)
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{
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*(str->string + 1) = '+';
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*(str->string + 2) = ' ';
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str->string += 3;
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str->len += 3;
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}
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else
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{
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str->string += 1;
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str->len += 1;
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}
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}
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disp_len = sprintf(str->string, "%d", displacement);
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str->string += disp_len;
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@ -296,11 +306,23 @@ int MOV_I_T_RM_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int byte
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fprintf(output, "%s %s, %s%d\n", "mov", mem_data.string, WORD_SIGNAL_TXT[is_wide], wide_data);
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break;
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}
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return extra_bytes_read;
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}
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int16_t calc_effective_disp(uint8_t high_order, uint8_t low_order)
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{
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const uint8_t low_order_neg_mask = 0b1000'0000;
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int16_t effective_disp = 0;
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if (high_order == 0 & ((low_order & low_order_neg_mask) >> 7))
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high_order = high_order | 0b1111'1111;
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int8_t *effective_disp_high_order =(int8_t*) &(effective_disp) + 1;
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memcpy(&(effective_disp), &low_order, 1);
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memcpy(effective_disp_high_order, &high_order, 1);
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return effective_disp;
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}
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int MOV_RM_TF_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_read)
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{
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const uint8_t wide_mask = 0b0000'0001;
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@ -312,8 +334,13 @@ int MOV_RM_TF_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int byt
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uint8_t low_disp = 0;
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uint8_t high_disp = 0;
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uint16_t wide_disp = 0;
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int16_t effective_disp = 0;
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uint8_t extra_bytes_read = 0;
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output_string mem_data;
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mem_data.len = 0;
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mem_data.string = calloc(18, sizeof(char)); //"[bp + di + 65535]\0"
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bool reg_is_dest = (byte1 & dest_mask);
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uint8_t inst_mod = (byte2 & mod_mask) >> 6;
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@ -342,28 +369,22 @@ int MOV_RM_TF_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int byt
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fread(byte, sizeof(byte), 1, bin.binary);
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extra_bytes_read++;
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low_disp = (uint8_t)byte[0];
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reg_value = ((byte2 & regm_mask) >> 3) + ((byte1 & wide_mask) * 8);
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ea_table_value = (byte2 & (regm_mask >> 3));
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effective_disp = calc_effective_disp(0, low_disp);
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//EA STRING GENERATION
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*ea_string_write_ptr = '[';
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ea_string_write_ptr++;
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memcpy(ea_string_write_ptr, EA_ENCODING_TXT[ea_table_value], strlen(EA_ENCODING_TXT[ea_table_value]));
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ea_string_write_ptr += strlen(EA_ENCODING_TXT[ea_table_value]);
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memcpy(ea_string_write_ptr, " + ", 3);
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ea_string_write_ptr += 3;
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disp_len = sprintf(ea_string_write_ptr, "%d", low_disp);
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ea_string_write_ptr += disp_len;
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*ea_string_write_ptr = ']';
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fill_ea_string(&mem_data, EA_ENCODING_TXT[ea_table_value], effective_disp);
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//END
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printf("%s %s, %s\n", "mov", (reg_is_dest ? REG_ENCODING_TXT[reg_value]
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: ea_string)
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, (reg_is_dest ? ea_string
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: mem_data.string)
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, (reg_is_dest ? mem_data.string
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: REG_ENCODING_TXT[reg_value]));
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fprintf(output, "%s %s, %s\n", "mov", (reg_is_dest ? REG_ENCODING_TXT[reg_value]
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: ea_string)
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, (reg_is_dest ? ea_string
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: mem_data.string)
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, (reg_is_dest ? mem_data.string
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: REG_ENCODING_TXT[reg_value]));
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break;
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case (MEM_16BIT_DISP):
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@ -375,30 +396,22 @@ int MOV_RM_TF_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int byt
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high_disp = (uint8_t)byte[0];
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//Composing wide displacement
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wide_disp = high_disp << 8;
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wide_disp = wide_disp | low_disp;
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effective_disp = calc_effective_disp(high_disp, low_disp);
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reg_value = ((byte2 & regm_mask) >> 3) + ((byte1 & wide_mask) * 8);
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ea_table_value = (byte2 & (regm_mask >> 3));
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//EA STRING GENERATION
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*ea_string_write_ptr = '[';
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ea_string_write_ptr++;
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memcpy(ea_string_write_ptr, EA_ENCODING_TXT[ea_table_value], strlen(EA_ENCODING_TXT[ea_table_value]));
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ea_string_write_ptr += strlen(EA_ENCODING_TXT[ea_table_value]);
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memcpy(ea_string_write_ptr, " + ", 3);
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ea_string_write_ptr += 3;
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disp_len = sprintf(ea_string_write_ptr, "%d", wide_disp);
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ea_string_write_ptr += disp_len;
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*ea_string_write_ptr = ']';
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fill_ea_string(&mem_data, EA_ENCODING_TXT[ea_table_value], effective_disp);
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//END
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printf("%s %s, %s\n", "mov", (reg_is_dest ? REG_ENCODING_TXT[reg_value]
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: ea_string)
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, (reg_is_dest ? ea_string
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: mem_data.string)
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, (reg_is_dest ? mem_data.string
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: REG_ENCODING_TXT[reg_value]));
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fprintf(output, "%s %s, %s\n", "mov", (reg_is_dest ? REG_ENCODING_TXT[reg_value]
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: ea_string)
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, (reg_is_dest ? ea_string
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: mem_data.string)
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, (reg_is_dest ? mem_data.string
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: REG_ENCODING_TXT[reg_value]));
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break;
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case (MEM_NO_DISP):
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@ -25,7 +25,8 @@ mov ah, [bx + si + 4]
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; Source address calculation plus 16-bit displacement
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mov al, [bx + si + 4999]
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; Dest address calculation
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; Dest address calculation
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mov [bx + di], cx
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mov [bp + si], cl
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mov [bp], ch
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BIN
1-2/listing-40
BIN
1-2/listing-40
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@ -1,10 +1,13 @@
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bits 16
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; Signed displacements
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mov ax, [bx - 100]
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mov ax, [bx - 3]
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mov ax, [bx + di - 40000]
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mov ax, [bx + di - 37]
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mov [si - 300], cx
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mov dx, [bx - 32]
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; Explicit sizes
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mov [bp + di], byte 7
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mov [di + 901], word 347
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@ -16,7 +19,7 @@ mov bx, [3458]
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; Memory-to-accumulator test
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mov ax, [2555]
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mov ax, [16]
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; Accumulator-to-memory test
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mov [2554], ax
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mov [15], ax
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BIN
1-2/output
BIN
1-2/output
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@ -1,18 +1,16 @@
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bits 16
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mov si, bx
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mov dh, al
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mov cl, 12
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mov ch, 244
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mov cx, 12
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mov cx, 65524
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mov dx, 3948
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mov dx, 61588
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mov al, [bx + si]
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mov bx, [bp + di]
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mov dx, [bp + 0]
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mov ah, [bx + si + 4]
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mov al, [bx + si + 4999]
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mov [bx + di], cx
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mov [bp + si], cl
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mov [bp + 0], ch
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mov ax, [bx -100]
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mov ax, [bx -3]
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mov ax, [bx + di + 25536]
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mov ax, [bx + di -37]
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mov [si -300], cx
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mov dx, [bx -32]
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mov [bp + di], byte 7
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mov [di + 901], word 347
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mov bp, [5]
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mov bx, [3458]
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mov ax, [2555]
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mov ax, [16]
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mov [2554], ax
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mov [15], ax
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