1-3 complete
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873159c5ee
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53b4945844
5 changed files with 167 additions and 80 deletions
BIN
1-3/8086coded
BIN
1-3/8086coded
Binary file not shown.
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@ -17,6 +17,48 @@
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/* CMP = 0b111, */
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/* } ARITHMETIC_OP; */
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typedef enum COND_JMP_OPC
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{
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JX = 0b0111,
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LOOPX = 0b1110'00,
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} JMP_OPC;
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typedef enum LOOPX_INST
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{
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LOOP = 0b10,
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LOOPZ = 0b01,
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LOOPNZ = 0b00,
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JCXZ = 0b11
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} LOOPX_INST;
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#define LOOPX_INST_TXT_LEN 7
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char LOOPX_INST_TXT[0b100][LOOPX_INST_TXT_LEN] = { "loopnz", "loopz", "loop", "jcxz" };
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typedef enum JX_INST
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{
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JZ = 0b0100,
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JL = 0b1100,
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JLE = 0b1110,
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JB = 0b0010,
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JBE = 0b0110,
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JP = 0b1010,
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JO = 0b0000,
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JS = 0b1000,
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JNE = 0b0101,
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JNL = 0b1101,
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JNLE = 0b1111,
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JNB = 0b0011,
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JNBE = 0b0111,
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JNP = 0b1011,
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JNO = 0b0001,
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JNS = 0b1001,
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} JX_INST;
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#define JX_INST_TXT_LEN 5
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char JX_INST_TXT[0b10000][JX_INST_TXT_LEN] = { "jo", "jno", "jb", "jnb", "jz", "jne", "jbe", "jnbe",
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"js", "jns", "jp", "jnp", "jl", "jnl", "jle", "jnle" };
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typedef enum ARITHMETIC_OP
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{
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ADD = 0b000,
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@ -351,7 +393,7 @@ int16_t calc_effective_disp(uint8_t high_order, uint8_t low_order, bool lo_only)
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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 (lo_only & ((low_order & low_order_neg_mask) >> 7))
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if (lo_only && ((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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@ -682,14 +724,14 @@ int ASC_I_RM_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_
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effective_disp = calc_effective_disp(high_disp, low_disp, false);
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low_data = payload[2];
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if (is_wide)
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if (is_wide && !is_sign)
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{
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high_data = payload[3];
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effective_data = calc_effective_disp(high_data, low_data, false);
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}
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else
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{
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effective_data = calc_effective_disp(0, low_disp, true);
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effective_data = calc_effective_disp(0, low_data, true);
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}
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fill_ea_string(&mem_data, EA_ENCODING_TXT[ea_table_value], effective_disp);
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@ -828,6 +870,23 @@ int ASC_REGM_R_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int byte
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return extra_bytes_read;
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}
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void JMP_parse(uint8_t byte1, uint8_t byte2, binary_data *binary, int bytes_read, JMP_OPC op)
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{
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const uint8_t loopx_mask = 0b0000'0011;
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const uint8_t jx_mask = 0b0000'1111;
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int8_t disp = 0;
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memcpy(&disp, &byte2, sizeof(uint8_t));
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uint8_t jump_op = (op == LOOPX) ? (byte1 & loopx_mask) : (byte1 & jx_mask);
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char nasm_offset[4] = { "\0" };
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if (!disp) strcpy(nasm_offset, "$+");
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else strcpy(nasm_offset, "$+2");
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//We have to add +2 to displacement so that NASM can parse displacements correctly
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printf("%s %s%+d \n", (op == LOOPX) ? LOOPX_INST_TXT[jump_op] : JX_INST_TXT[jump_op], nasm_offset, disp);
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fprintf(output, "%s %s%+d \n", (op == LOOPX) ? LOOPX_INST_TXT[jump_op] : JX_INST_TXT[jump_op], nasm_offset, disp);
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}
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int main(int argc, char** argv)
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{
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if (argc != 2) return -1;
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@ -848,8 +907,9 @@ int main(int argc, char** argv)
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fread(byte, sizeof(byte), 1, bin.binary);
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uint8_t manip_inst = (uint8_t)byte[0];
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uint8_t inst = (uint8_t)byte[0];
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//First, we check for ASC.
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//First, we check for ASC or JMPs.
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manip_inst = (manip_inst >> 1);
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if ((manip_inst & ASC_I_A_M) == ASC_I_A)
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{
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if (bytes_read >= bin.size) break;
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@ -860,6 +920,15 @@ int main(int argc, char** argv)
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continue;
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}
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manip_inst = (inst >> 2);
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if (manip_inst == LOOPX)
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{
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if (bytes_read >= bin.size) break;
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fread(byte, sizeof(byte), 1, bin.binary);
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bytes_read++;
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inst_byte2 = (uint8_t)byte[0];
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JMP_parse(inst, inst_byte2, 0, 0, LOOPX);
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continue;
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}
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if ((manip_inst & ASC_REGM_R_M) == ASC_REGM_R)
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{
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if (bytes_read >= bin.size) break;
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@ -877,7 +946,17 @@ int main(int argc, char** argv)
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inst_byte2 = (uint8_t)byte[0];
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bytes_read += ASC_I_RM_parse(inst, inst_byte2, 0, 0);
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continue;
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}
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}
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manip_inst = (inst >> 4);
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if (manip_inst == JX)
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{
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if (bytes_read >= bin.size) break;
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fread(byte, sizeof(byte), 1, bin.binary);
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bytes_read++;
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inst_byte2 = (uint8_t)byte[0];
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JMP_parse(inst, inst_byte2, 0, 0, JX);
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continue;
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}
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//Then, we're checking for all MOV except segment registers
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manip_inst = (inst >> 1);
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switch (manip_inst)
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BIN
1-3/listing-41
BIN
1-3/listing-41
Binary file not shown.
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@ -1,26 +1,10 @@
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; ========================================================================
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;bits 16
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;
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; (C) Copyright 2023 by Molly Rocket, Inc., All Rights Reserved.
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;
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; This software is provided 'as-is', without any express or implied
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; warranty. In no event will the authors be held liable for any damages
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; arising from the use of this software.
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;
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; Please see https://computerenhance.com for further information
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;
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; ========================================================================
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; ========================================================================
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; LISTING 41
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; ========================================================================
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bits 16
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;add bx, [bx+si]
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;add bx, [bp]
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add si, 2
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add bp, 2
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add cx, 8
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;add si, 2
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;add bp, 2
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;add cx, 8
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;add bx, [bp + 0]
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;add cx, [bx + 2]
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;add bh, [bp + si + 4]
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@ -31,21 +15,20 @@ add cx, 8
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;add [bx + 2], cx
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;add [bp + si + 4], bh
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;add [bp + di + 6], di
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add byte [bx], 34
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add word [bp + si + 1000], 29
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; add ax, [bp]
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; add al, [bx + si]
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; add ax, bx
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add al, ah
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add ax, 1000
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add al, -30
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add al, 9
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;add byte [bx], 34
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;add word [bp + si + 1000], 29
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;add ax, [bp]
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;add al, [bx + si]
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;add ax, bx
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;add al, ah
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;add ax, 1000
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;add al, -30
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;add al, 9
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;sub bx, [bx+si]
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;sub bx, [bp]
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sub si, 2
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sub bp, 2
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sub cx, 8
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;sub si, 2
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;sub bp, 2
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;sub cx, 8
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;sub bx, [bp + 0]
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;sub cx, [bx + 2]
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;sub bh, [bp + si + 4]
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@ -56,21 +39,20 @@ sub cx, 8
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;sub [bx + 2], cx
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;sub [bp + si + 4], bh
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;sub [bp + di + 6], di
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sub byte [bx], 34
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sub word [bx + di], 29
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;sub byte [bx], 34
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;sub word [bx + di], 29
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;sub ax, [bp]
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;sub al, [bx + si]
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;sub ax, bx
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;sub al, ah
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sub ax, 1000
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sub al, -30
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sub al, 9
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;sub ax, 1000
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;sub al, -30
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;sub al, 9
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;cmp bx, [bx+si]
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;cmp bx, [bp]
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cmp si, 2
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cmp bp, 2
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cmp cx, 8
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;cmp si, 2
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;cmp bp, 2
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;cmp cx, 8
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;cmp bx, [bp + 0]
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;cmp cx, [bx + 2]
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;cmp bh, [bp + si + 4]
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@ -81,41 +63,41 @@ cmp cx, 8
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;cmp [bx + 2], cx
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;cmp [bp + si + 4], bh
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;cmp [bp + di + 6], di
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cmp byte [bx], 34
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cmp word [4834], 29
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;cmp byte [bx], 34
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;cmp word [4834], 29
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;cmp ax, [bp]
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;cmp al, [bx + si]
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;cmp ax, bx
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;cmp al, ah
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cmp ax, 1000
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cmp al, -30
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cmp al, 9
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;cmp ax, 1000
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;cmp al, -30
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;cmp al, 9
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; test_label0:
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; jnz test_label1
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; jnz test_label0
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; test_label1:
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; jnz test_label0
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; jnz test_label1
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;
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; label:
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; je label
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; jl label
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; jle label
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; jb label
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; jbe label
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; jp label
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; jo label
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; js label
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; jne label
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; jnl label
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; jg label
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; jnb label
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; ja label
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; jnp label
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; jno label
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; jns label
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; loop label
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; loopz label
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; loopnz label
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; jcxz label
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test_label0:
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jnz test_label1
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jnz test_label0
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test_label1:
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jnz test_label0
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jnz test_label1
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label:
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je label
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jl label
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jle label
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jb label
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jbe label
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jp label
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jo label
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js label
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jne label
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jnl label
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jg label
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jnb label
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ja label
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jnp label
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jno label
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jns label
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loop label
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loopz label
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loopnz label
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jcxz label
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@ -0,0 +1,26 @@
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bits 16
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jne $+2+2
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jne $+2-4
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jne $+2-6
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jne $+2-4
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jz $+2-2
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jl $+2-4
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jle $+2-6
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jb $+2-8
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jbe $+2-10
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jp $+2-12
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jo $+2-14
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js $+2-16
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jne $+2-18
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jnl $+2-20
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jnle $+2-22
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jnb $+2-24
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jnbe $+2-26
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jnp $+2-28
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jno $+2-30
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jns $+2-32
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loop $+2-34
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loopz $+2-36
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loopnz $+2-38
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jcxz $+2-40
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