ASM: Wrote the start of the definition for the ISA and some of the disassembly logic
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165
assembly.c
165
assembly.c
@ -1,17 +1,170 @@
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#include "assembly.h"
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#include "assembly.h"
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#include <string.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <stdio.h>
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// Max instruction width is 25 characters without the null char
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// Max instruction width is 25 characters without the null char
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//
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// INSTRUCTIONS:
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// BYTE 3 BYTE 2 BYTE 1 BYTE 0
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// +===================================================+
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// | | | | |
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// +===================================================+
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//
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//
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//
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// INSTRUCTION FORMAT 0:
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// +===================================================+
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// | OPCODE | 24 BIT IMMEDIATE ADDRESS |
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// +===================================================+
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//
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// INSTRUCTION FORMAT 1:
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// +===================================================+
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// | OPCODE | SOURCE REG | DEST REG |
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// +===================================================+
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//
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// INSTRUCTION FORMAT 2:
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// +===================================================+
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// | OPCODE | DEST REG | 16 BIT IMMEDIATE |
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// +===================================================+
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//
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//
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//
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// OPCODE FORMAT:
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// ______________________________________________________________________________________________________
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// |BIT | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
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// +----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
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// | | INSTR. FORMAT | 8bit opcode num : 16bit opcode num |
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// +----+-----------------+-----------------------------+-----------------------------------------------+
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//
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//
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// INSTRUCTION FORMAT 0 OPCODE NUM:
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// +-------+----------------------------------+--------------+
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// | NUM | DESCRIPTION | AFFECT FLAGS |
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// +-------+----------------------------------+--------------+
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// | 5'd0 | NOP | NO |
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// +-------+----------------------------------+--------------+
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// | 5'd1 | Unconditional Jump | NO |
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// +-------+----------------------------------+--------------+
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// | 5'd2 | Jump if zero flag is set | NO |
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// +-------+----------------------------------+--------------+
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// | 5'd3 | Jump if zero flag is not set | NO |
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// +-------+----------------------------------+--------------+
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// | 5'd4 | Jump if carry flag is set | NO |
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// +-------+----------------------------------+--------------+
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// | 5'd5 | Jump if carry flag is not set | NO |
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//
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//
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// INSTRUCTION FORMAT 1 OPCODE NUM:
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// +-------+----------------------------------+--------------+
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// | NUM | DESCRIPTION | AFFECT FLAGS |
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// +-------+----------------------------------+--------------+
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// | 13'd0 | ADD | YES |
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// +-------+----------------------------------+--------------|
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// | 13'd1 | SUBTRACT | YES |
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// +-------+----------------------------------+--------------|
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// | 13'd2 | SHIFT LEFT | YES |
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// +-------+----------------------------------+--------------|
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// | 13'd3 | SHIFT RIGHT | YES |
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// +-------+----------------------------------+--------------|
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// | 13'd4 | COMPARE (SUBTRACT WITHOUT SAVE) | YES |
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//
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//
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// INSTRUCTION FORMAT 2 OPCODE NUM:
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// +-------+----------------------------------------------+--------------+
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// | NUM | DESCRIPTION | AFFECT FLAGS |
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// +-------+----------------------------------------------+--------------+
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// | 5'd0 | MOV IMMEDIATE TO DEST LOW PART OF REGISTER | NO |
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// +-------+----------------------------------------------+--------------+
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// | 5'd1 | MOV IMMEDIATE TO DEST HIGH PART OF REGISTER | NO |
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#define MAX_INSTRUCTION_LENGTH 26
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char *disassemble(uint32_t opcode_be){
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uint32_t opcode=(opcode_be&0x000000FF)<<24|(opcode_be&0x0000FF00)<<8|(opcode_be&0x00FF0000)>>8|(opcode_be&0xFF000000)>>24;
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char *ret=malloc(MAX_INSTRUCTION_LENGTH);
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char *disassemble(uint32_t opcode){
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char *ret=malloc(26);
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if (!ret)
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if (!ret)
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return NULL;
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return NULL;
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if(opcode!=0x01ABCDEF)
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memcpy(ret,"placeholder",12);
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//////// PARSE BITECODE //////////
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else
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memcpy(ret,"easter egg",11);
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int instruction_format,opcode_num;
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uint32_t val;
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uint8_t val1;
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uint8_t val2;
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instruction_format=(opcode&0xE0000000)>>29;
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if(instruction_format==0){
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// 8bit opcode
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opcode_num=(opcode&0x1F000000)>>24;
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val=opcode&0x00FFFFFF;
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switch(opcode_num){
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case 0x00:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"NOP");
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break;
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case 0x01:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"JMP $%06X",val);
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break;
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case 0x02:
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case 0x03:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"JMP %s,$%06X",opcode_num&1?"Z":"NZ",val);
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break;
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case 0x04:
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case 0x05:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"JMP %s,$%06X",opcode_num&1?"C":"NC",val);
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break;
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default:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"UNRECOGNISED INSTR");
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break;
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}
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}else if(instruction_format==1){
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// 16bit opcode
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opcode_num=(opcode&0x1FFF0000)>>16;
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val1=(opcode&0x0000FF00)>>8;
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val2=opcode&0x000000FF;
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switch(opcode_num){
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case 0x00:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"ADD %%R%0d, %%R%0d",val1,val2);
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break;
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case 0x01:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"SUB %%R%0d, %%R%0d",val1,val2);
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break;
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case 0x02:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"SL %%R%0d",val1);
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break;
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case 0x03:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"SR %%R%0d",val1);
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break;
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case 0x04:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"CMP %%R%0d, %%R%0d",val1,val2);
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break;
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default:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"UNRECOGNISED INSTRUCTION");
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break;
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}
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}else if(instruction_format==2){
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// 16bit opcode
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opcode_num=(opcode&0x1FFF0000)>>16;
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val1=(opcode&0x00FF0000)>>16;
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val=opcode&0x0000FFFF;
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switch(opcode_num){
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case 0x00:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"MOV $%04X, %%R%0dl",val,val1);
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break;
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case 0x01:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"MOV $%04X, %%R%0dh",val,val1);
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break;
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default:
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"UNRECOGNISED INSTRUCTION");
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break;
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}
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}else
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snprintf(ret,MAX_INSTRUCTION_LENGTH,"UNRECOGNISED INSTRUCTION");
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return ret;
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return ret;
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}
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}
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4
gui.c
4
gui.c
@ -182,7 +182,7 @@ int update_general_disas(struct simdata_t *simdata){
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if(width<18){
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if(width<18){
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mvwprintw(general_disas,1,1,"too small window");
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mvwprintw(general_disas,1,1,"too small window");
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}else{
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}else{
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uint32_t ADDRESS=(simdata->PC-(height/2-2)*3)&0x00FFFFFF;
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uint32_t ADDRESS=(simdata->PC-(height/2-2)*4)&0x00FFFFFF;
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for (int i=2;i<height-2;i++){
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for (int i=2;i<height-2;i++){
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int overall_offset=offset_arrow-2;
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int overall_offset=offset_arrow-2;
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@ -199,7 +199,7 @@ int update_general_disas(struct simdata_t *simdata){
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if(ADDRESS==simdata->PC)
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if(ADDRESS==simdata->PC)
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wattroff(general_disas,A_BOLD);
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wattroff(general_disas,A_BOLD);
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ADDRESS=(ADDRESS+3)&0xFFFFFF;
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ADDRESS=(ADDRESS+4)&0xFFFFFF;
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free(disas);
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free(disas);
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}
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}
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mvwaddch(general_disas,height/2,offset_arrow,ACS_RARROW);
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mvwaddch(general_disas,height/2,offset_arrow,ACS_RARROW);
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