sim8086: Start storing instructions into generic data structure
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part1/sim8086.c
297
part1/sim8086.c
@ -3,10 +3,159 @@
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#include "sim8086_stdlib.c"
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S86_RegisterType S86_RegisterTypeFromWReg(bool w, uint8_t reg)
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{
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S86_ASSERT(reg < 8);
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S86_RegisterType const type_table[2][8] = {
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[0b0] = {
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[0] = S86_RegisterType_AL,
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[1] = S86_RegisterType_CL,
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[2] = S86_RegisterType_DL,
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[3] = S86_RegisterType_BL,
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[4] = S86_RegisterType_AH,
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[5] = S86_RegisterType_CH,
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[6] = S86_RegisterType_DH,
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[7] = S86_RegisterType_BH,
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},
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[0b1] = {
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[0] = S86_RegisterType_AX,
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[1] = S86_RegisterType_CX,
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[2] = S86_RegisterType_DX,
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[3] = S86_RegisterType_BX,
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[4] = S86_RegisterType_SP,
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[5] = S86_RegisterType_BP,
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[6] = S86_RegisterType_SI,
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[7] = S86_RegisterType_DI,
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},
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};
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S86_RegisterType result = type_table[w][reg];
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return result;
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}
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S86_SegmentRegisterType S86_SegmentRegisterTypeFromSR(uint8_t sr)
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{
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S86_ASSERT(sr < 4);
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S86_SegmentRegisterType result = S86_SegmentRegisterType_ES + sr;
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return result;
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}
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S86_Str8 S86_SegmentRegisterStr8(S86_SegmentRegisterType type)
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{
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S86_Str8 result = {0};
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switch (type) {
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case S86_SegmentRegisterType_Invalid: S86_ASSERT(0); break;
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case S86_SegmentRegisterType_ES: result = S86_STR8("es"); break;
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case S86_SegmentRegisterType_CS: result = S86_STR8("cs"); break;
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case S86_SegmentRegisterType_SS: result = S86_STR8("ss"); break;
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case S86_SegmentRegisterType_DS: result = S86_STR8("ds"); break;
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case S86_SegmentRegisterType_Count: S86_ASSERT(0); break;
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}
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return result;
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}
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S86_Str8 S86_RegisterStr8(S86_RegisterType type)
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{
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S86_Str8 result = {0};
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switch (type) {
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case S86_RegisterType_AL: result = S86_STR8("al"); break;
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case S86_RegisterType_CL: result = S86_STR8("cl"); break;
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case S86_RegisterType_DL: result = S86_STR8("dl"); break;
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case S86_RegisterType_BL: result = S86_STR8("bl"); break;
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case S86_RegisterType_AH: result = S86_STR8("ah"); break;
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case S86_RegisterType_CH: result = S86_STR8("ch"); break;
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case S86_RegisterType_DH: result = S86_STR8("dh"); break;
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case S86_RegisterType_BH: result = S86_STR8("bh"); break;
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case S86_RegisterType_AX: result = S86_STR8("ax"); break;
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case S86_RegisterType_CX: result = S86_STR8("cx"); break;
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case S86_RegisterType_DX: result = S86_STR8("dx"); break;
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case S86_RegisterType_BX: result = S86_STR8("bx"); break;
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case S86_RegisterType_SP: result = S86_STR8("sp"); break;
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case S86_RegisterType_BP: result = S86_STR8("bp"); break;
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case S86_RegisterType_SI: result = S86_STR8("si"); break;
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case S86_RegisterType_DI: result = S86_STR8("di"); break;
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case S86_RegisterType_BX_SI: result = S86_STR8("bx + si"); break;
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case S86_RegisterType_BX_DI: result = S86_STR8("bx + di"); break;
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case S86_RegisterType_BP_SI: result = S86_STR8("bp + si"); break;
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case S86_RegisterType_BP_DI: result = S86_STR8("bp + di"); break;
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case S86_RegisterType_DirectAddress: result = S86_STR8(""); break;
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case S86_RegisterType_Immediate: result = S86_STR8(""); break;
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}
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return result;
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}
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void S86_PrintAsmOp(S86_AsmOp asm_op)
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{
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S86_Print(S86_STR8(" "));
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{
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if (asm_op.wide_prefix == S86_WidePrefix_Dest)
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S86_PrintFmt("%s ", asm_op.wide ? "word" : "byte");
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if (asm_op.has_displacement && asm_op.effective_addr == S86_EffectiveAddress_Dest)
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S86_Print(S86_STR8("["));
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if (asm_op.effective_addr == S86_EffectiveAddress_Dest && asm_op.seg_reg != S86_SegmentRegisterType_Invalid) {
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S86_Str8 seg_reg_str8 = S86_SegmentRegisterStr8(asm_op.seg_reg);
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S86_PrintFmt("%.*s:", S86_STR8_FMT(seg_reg_str8));
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}
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if (asm_op.dest == S86_RegisterType_DirectAddress) {
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S86_PrintFmt("%s%d",
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asm_op.displacement >= 0 ? "" : "-",
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asm_op.displacement >= 0 ? asm_op.displacement : -asm_op.displacement);
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} else if (asm_op.dest == S86_RegisterType_Immediate) {
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S86_PrintFmt("%u", asm_op.immediate);
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} else {
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S86_Str8 reg_str8 = S86_RegisterStr8(asm_op.dest);
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S86_PrintFmt("%.*s", S86_STR8_FMT(reg_str8));
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if (asm_op.effective_addr == S86_EffectiveAddress_Dest && asm_op.displacement) {
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S86_PrintFmt(" %c %d",
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asm_op.displacement >= 0 ? '+' : '-',
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asm_op.displacement >= 0 ? asm_op.displacement : -asm_op.displacement);
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}
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}
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if (asm_op.has_displacement && asm_op.effective_addr == S86_EffectiveAddress_Dest)
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S86_Print(S86_STR8("]"));
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}
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S86_PrintFmt(", ");
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{
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if (asm_op.wide_prefix == S86_WidePrefix_Src)
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S86_PrintFmt("%s ", asm_op.wide ? "word" : "byte");
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if (asm_op.has_displacement && asm_op.effective_addr == S86_EffectiveAddress_Src)
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S86_Print(S86_STR8("["));
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if (asm_op.effective_addr == S86_EffectiveAddress_Src && asm_op.seg_reg != S86_SegmentRegisterType_Invalid) {
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S86_Str8 seg_reg_str8 = S86_SegmentRegisterStr8(asm_op.seg_reg);
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S86_PrintFmt("%.*s:", S86_STR8_FMT(seg_reg_str8));
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}
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if (asm_op.src == S86_RegisterType_DirectAddress) {
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S86_PrintFmt("%s%d",
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asm_op.displacement >= 0 ? "" : "-",
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asm_op.displacement >= 0 ? asm_op.displacement : -asm_op.displacement);
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} else if (asm_op.src == S86_RegisterType_Immediate) {
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S86_PrintFmt("%u", asm_op.immediate);
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} else {
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S86_Str8 reg_str8 = S86_RegisterStr8(asm_op.src);
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S86_PrintFmt("%.*s", S86_STR8_FMT(reg_str8));
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if (asm_op.effective_addr == S86_EffectiveAddress_Src && asm_op.displacement) {
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S86_PrintFmt(" %c %d",
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asm_op.displacement >= 0 ? '+' : '-',
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asm_op.displacement >= 0 ? asm_op.displacement : -asm_op.displacement);
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}
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}
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if (asm_op.has_displacement && asm_op.effective_addr == S86_EffectiveAddress_Src)
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S86_Print(S86_STR8("]"));
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}
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S86_Print(S86_STR8("\n"));
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}
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// NOTE: Implementation
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// ============================================================================
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S86_Str8 REGISTER_FIELD_ENCODING[2][8];
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S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_Str8 seg_reg)
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S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_SegmentRegisterType seg_reg)
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{
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// NOTE: Calculate displacement
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// =========================================================================
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@ -23,22 +172,29 @@ S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it,
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}
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S86_EffectiveAddressStr8 result = {0};
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result.displacement = displacement;
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if (mod == 0b11) {
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result.reg_type = S86_RegisterTypeFromWReg(w, rm);
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S86_Str8 register_field = REGISTER_FIELD_ENCODING[w][rm];
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memcpy(result.data + result.size, register_field.data, register_field.size);
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result.size += register_field.size;
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} else {
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// NOTE: Effective address calculation w/ displacement
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// =========================================================================
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if (seg_reg.size) {
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memcpy(result.data + result.size, seg_reg.data, seg_reg.size);
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result.size += seg_reg.size;
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if (seg_reg != S86_SegmentRegisterType_Invalid) {
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result.seg_reg_type = seg_reg;
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S86_Str8 seg_reg_str8 = S86_SegmentRegisterStr8(seg_reg);
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memcpy(result.data + result.size, seg_reg_str8.data, seg_reg_str8.size);
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result.size += seg_reg_str8.size;
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result.data[result.size++] = ':';
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}
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result.has_displacement = true;
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result.data[result.size++] = '[';
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if (direct_address) {
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result.reg_type = S86_RegisterType_DirectAddress;
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result.size += snprintf(result.data + result.size,
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sizeof(result.data) - result.size,
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"%s%d",
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@ -46,14 +202,14 @@ S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it,
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} else {
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S86_Str8 base_calc = {0};
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switch (rm) {
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case 0b000: base_calc = S86_STR8("bx + si"); break;
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case 0b001: base_calc = S86_STR8("bx + di"); break;
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case 0b010: base_calc = S86_STR8("bp + si"); break;
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case 0b011: base_calc = S86_STR8("bp + di"); break;
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case 0b100: base_calc = S86_STR8("si"); break;
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case 0b101: base_calc = S86_STR8("di"); break;
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case 0b110: base_calc = S86_STR8("bp"); break;
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case 0b111: base_calc = S86_STR8("bx"); break;
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case 0b000: base_calc = S86_STR8("bx + si"); result.reg_type = S86_RegisterType_BX_SI; break;
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case 0b001: base_calc = S86_STR8("bx + di"); result.reg_type = S86_RegisterType_BX_DI; break;
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case 0b010: base_calc = S86_STR8("bp + si"); result.reg_type = S86_RegisterType_BP_SI; break;
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case 0b011: base_calc = S86_STR8("bp + di"); result.reg_type = S86_RegisterType_BP_DI; break;
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case 0b100: base_calc = S86_STR8("si"); result.reg_type = S86_RegisterType_SI; break;
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case 0b101: base_calc = S86_STR8("di"); result.reg_type = S86_RegisterType_DI; break;
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case 0b110: base_calc = S86_STR8("bp"); result.reg_type = S86_RegisterType_BP; break;
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case 0b111: base_calc = S86_STR8("bx"); result.reg_type = S86_RegisterType_BX; break;
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default: S86_ASSERT(!"Invalid rm value, must be 3 bits"); break;
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}
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@ -413,7 +569,7 @@ int main(int argc, char **argv)
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S86_PrintLn(S86_STR8("bits 16"));
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S86_BufferIterator buffer_it = S86_BufferIteratorInit(buffer);
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S86_Str8 seg_reg = {0};
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S86_SegmentRegisterType seg_reg = {0};
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bool lock_prefix = false;
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while (S86_BufferIteratorHasMoreBytes(buffer_it)) {
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@ -464,6 +620,10 @@ int main(int argc, char **argv)
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S86_ASSERT(instruction_type != S86_InstructionType_Count && "Unknown instruction");
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S86_Print(instruction->mnemonic);
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S86_AsmOp asm_op = {0};
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asm_op.lock = lock_prefix;
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asm_op.seg_reg = seg_reg;
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switch (instruction_type) {
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// NOTE: Instruction Pattern => [0b0000'0000W | 0bAA00'0CCC | DISP-LO | DISP-HI]
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// Where, W: Optional, AA: mod, CCC: R/M
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@ -602,21 +762,30 @@ int main(int argc, char **argv)
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S86_ASSERT(reg < 8);
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S86_ASSERT(rm < 8);
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if (mod == 0b11) {
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// NOTE: Register-to-register move
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// =========================================================
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S86_Str8 src_op = REGISTER_FIELD_ENCODING[w][d ? rm : reg];
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S86_Str8 dest_op = REGISTER_FIELD_ENCODING[w][d ? reg : rm];
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S86_PrintLnFmt(" %.*s, %.*s", S86_STR8_FMT(dest_op), S86_STR8_FMT(src_op));
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} else {
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// NOTE: Memory mode w/ effective address calculation
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// =========================================================
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asm_op.wide = w;
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asm_op.src = S86_RegisterTypeFromWReg(asm_op.wide, reg);
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if (mod == 0b11) { // NOTE: Register-to-register move
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asm_op.dest = S86_RegisterTypeFromWReg(asm_op.wide, rm);
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} else { // NOTE: Memory mode w/ effective address calculation
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S86_EffectiveAddressStr8 effective_address = S86_EffectiveAddressCalc(&buffer_it, rm, mod, w, seg_reg);
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S86_Str8 addr = { .data = effective_address.data, .size = effective_address.size };
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S86_Str8 dest_op = d ? REGISTER_FIELD_ENCODING[w][reg] : addr;
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S86_Str8 src_op = d ? addr : REGISTER_FIELD_ENCODING[w][reg];
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S86_PrintLnFmt(" %.*s, %.*s", S86_STR8_FMT(dest_op), S86_STR8_FMT(src_op));
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asm_op.displacement = effective_address.displacement;
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asm_op.src = S86_RegisterTypeFromWReg(w, reg);
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asm_op.dest = effective_address.reg_type;
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asm_op.has_displacement = effective_address.has_displacement;
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if (d) {
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asm_op.effective_addr = S86_EffectiveAddress_Src;
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} else {
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asm_op.effective_addr = S86_EffectiveAddress_Dest;
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}
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}
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if (d) {
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S86_RegisterType tmp = asm_op.src;
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asm_op.src = asm_op.dest;
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asm_op.dest = tmp;
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}
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S86_PrintAsmOp(asm_op);
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} break;
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// NOTE: Instruction Pattern => [0b0000'00SW | 0bAAA00BBB | DISP-LO | DISP-HI | DATA-LO | DATA-HI]
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@ -641,11 +810,11 @@ int main(int argc, char **argv)
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S86_ASSERT(rm < 8);
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S86_EffectiveAddressStr8 effective_address = S86_EffectiveAddressCalc(&buffer_it, rm, mod, w, seg_reg);
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asm_op.wide = w;
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// NOTE: Parse data payload
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// =============================================================
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uint16_t data = S86_BufferIteratorNextByte(&buffer_it);
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bool sign_extend_8bit_data = false;
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if (w) { // 16 bit data
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if ((instruction_type == S86_InstructionType_ADDImmediateToRegOrMem ||
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instruction_type == S86_InstructionType_ADCImmediateToRegOrMem ||
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@ -656,7 +825,8 @@ int main(int argc, char **argv)
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instruction_type == S86_InstructionType_TESTImmediateAndRegOrMem ||
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instruction_type == S86_InstructionType_ORImmediateToRegOrMem ||
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instruction_type == S86_InstructionType_XORImmediateToRegOrMem) && s) {
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sign_extend_8bit_data = true;
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// NOTE: Sign extend 8 bit, since we store into a
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// int32_t in asm_op this is done for free for us.
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} else {
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uint8_t data_hi = S86_BufferIteratorNextByte(&buffer_it);
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data |= (uint16_t)(data_hi) << 8;
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@ -669,18 +839,18 @@ int main(int argc, char **argv)
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// NOTE: Disassemble
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// =========================================================
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if (instruction_type == S86_InstructionType_MOVImmediateToRegOrMem) {
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S86_PrintLnFmt(" %.*s, %s %u", effective_address.size, effective_address.data, w ? "word" : "byte", data);
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} else {
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if (effective_address.has_displacement)
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S86_PrintFmt(" %s", w ? "word" : "byte", S86_STR8_FMT(effective_address));
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asm_op.immediate = data;
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asm_op.has_displacement = effective_address.has_displacement;
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asm_op.displacement = effective_address.displacement;
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asm_op.dest = effective_address.reg_type;
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asm_op.effective_addr = S86_EffectiveAddress_Dest;
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asm_op.src = S86_RegisterType_Immediate;
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S86_PrintFmt(" %.*s, ", S86_STR8_FMT(effective_address));
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if (sign_extend_8bit_data)
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S86_PrintLnFmt("%d", (int16_t)data);
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else
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S86_PrintLnFmt("%u", data);
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}
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if (instruction_type == S86_InstructionType_MOVImmediateToRegOrMem)
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asm_op.wide_prefix = S86_WidePrefix_Src;
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else if (effective_address.has_displacement)
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asm_op.wide_prefix = S86_WidePrefix_Dest;
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S86_PrintAsmOp(asm_op);
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} break;
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// NOTE: Instruction Pattern => [0b0000'W00W | DATA-LO | DATA-HI]
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@ -722,20 +892,18 @@ int main(int argc, char **argv)
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// NOTE: Disassemble
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// =============================================================
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S86_Str8 dest_register = {0};
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asm_op.effective_addr = S86_EffectiveAddress_Dest;
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asm_op.src = S86_RegisterType_Immediate;
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asm_op.wide = w;
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asm_op.src = S86_RegisterType_Immediate;
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asm_op.immediate = data;
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if (instruction_type == S86_InstructionType_MOVImmediateToReg) {
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uint8_t reg = (op_code_bytes[0] & 0b0000'0111) >> 0;
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dest_register = REGISTER_FIELD_ENCODING[w][reg];
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asm_op.dest = S86_RegisterTypeFromWReg(w, reg);
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} else {
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if (w) {
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dest_register = S86_STR8("ax");
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} else {
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data = S86_CAST(uint16_t)S86_CAST(int8_t)data; // Sign extension
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dest_register = S86_STR8("al");
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asm_op.dest = asm_op.wide ? S86_RegisterType_AX : S86_RegisterType_AL;
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}
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}
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S86_PrintLnFmt(" %.*s, %d", S86_STR8_FMT(dest_register), (int16_t)data);
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S86_PrintAsmOp(asm_op);
|
||||
} break;
|
||||
|
||||
// NOTE: Instruction Pattern => [0b0000'000W | DATA-LO]
|
||||
@ -744,25 +912,24 @@ int main(int argc, char **argv)
|
||||
case S86_InstructionType_OUTFixedPort: /*FALLTHRU*/
|
||||
case S86_InstructionType_OUTVariablePort: {
|
||||
S86_ASSERT(op_code_size == 1);
|
||||
uint8_t w = (op_code_bytes[0] & 0b0000'0001) >> 0;
|
||||
S86_Str8 accum_name = w ? S86_STR8("ax") : S86_STR8("al");
|
||||
bool is_in = instruction_type == S86_InstructionType_INFixedPort ||
|
||||
instruction_type == S86_InstructionType_INVariablePort;
|
||||
|
||||
char data_val[8] = {0};
|
||||
asm_op.wide = (op_code_bytes[0] & 0b0000'0001) >> 0;
|
||||
asm_op.dest = asm_op.wide ? S86_RegisterType_AX : S86_RegisterType_AL;
|
||||
if (instruction_type == S86_InstructionType_INFixedPort ||
|
||||
instruction_type == S86_InstructionType_OUTFixedPort) {
|
||||
uint8_t data = S86_BufferIteratorNextByte(&buffer_it);
|
||||
snprintf(data_val, sizeof(data_val), "%d", data);
|
||||
asm_op.src = S86_RegisterType_Immediate;
|
||||
asm_op.immediate = S86_BufferIteratorNextByte(&buffer_it);
|
||||
} else {
|
||||
data_val[0] = 'd';
|
||||
data_val[1] = 'x';
|
||||
asm_op.src = S86_RegisterType_DX;
|
||||
}
|
||||
|
||||
if (is_in)
|
||||
S86_PrintLnFmt(" %.*s, %s", S86_STR8_FMT(accum_name), data_val);
|
||||
else
|
||||
S86_PrintLnFmt(" %s, %.*s", data_val, S86_STR8_FMT(accum_name));
|
||||
if (instruction_type == S86_InstructionType_OUTFixedPort ||
|
||||
instruction_type == S86_InstructionType_OUTVariablePort) {
|
||||
S86_RegisterType tmp = asm_op.src;
|
||||
asm_op.src = asm_op.dest;
|
||||
asm_op.dest = tmp;
|
||||
}
|
||||
|
||||
S86_PrintAsmOp(asm_op);
|
||||
} break;
|
||||
|
||||
case S86_InstructionType_REP: {
|
||||
@ -868,7 +1035,7 @@ int main(int argc, char **argv)
|
||||
// NOTE: Mnemonic does not generate any assembly
|
||||
S86_ASSERT(op_code_size == 1);
|
||||
uint8_t sr = (op_code_bytes[0] & 0b0001'1000) >> 3;
|
||||
seg_reg = SEGMENT_REGISTER_NAME[sr];
|
||||
seg_reg = S86_SegmentRegisterTypeFromSR(sr);
|
||||
} else {
|
||||
S86_Print(S86_STR8("\n"));
|
||||
S86_ASSERT(!"Unhandled instruction");
|
||||
@ -880,6 +1047,6 @@ int main(int argc, char **argv)
|
||||
lock_prefix = false;
|
||||
|
||||
if (instruction_type != S86_InstructionType_SEGMENT)
|
||||
seg_reg.size = 0;
|
||||
seg_reg = S86_SegmentRegisterType_Invalid;
|
||||
}
|
||||
}
|
||||
|
||||
@ -178,10 +178,77 @@ typedef struct S86_Instruction {
|
||||
S86_Str8 mnemonic;
|
||||
} S86_Instruction;
|
||||
|
||||
typedef enum S86_RegisterType {
|
||||
S86_RegisterType_AL,
|
||||
S86_RegisterType_CL,
|
||||
S86_RegisterType_DL,
|
||||
S86_RegisterType_BL,
|
||||
S86_RegisterType_AH,
|
||||
S86_RegisterType_CH,
|
||||
S86_RegisterType_DH,
|
||||
S86_RegisterType_BH,
|
||||
|
||||
S86_RegisterType_AX,
|
||||
S86_RegisterType_CX,
|
||||
S86_RegisterType_DX,
|
||||
S86_RegisterType_BX,
|
||||
S86_RegisterType_SP,
|
||||
S86_RegisterType_BP,
|
||||
S86_RegisterType_SI,
|
||||
S86_RegisterType_DI,
|
||||
|
||||
S86_RegisterType_BX_SI,
|
||||
S86_RegisterType_BX_DI,
|
||||
S86_RegisterType_BP_SI,
|
||||
S86_RegisterType_BP_DI,
|
||||
|
||||
S86_RegisterType_DirectAddress,
|
||||
S86_RegisterType_Immediate,
|
||||
} S86_RegisterType;
|
||||
|
||||
typedef enum S86_SegmentRegisterType {
|
||||
S86_SegmentRegisterType_Invalid,
|
||||
S86_SegmentRegisterType_ES,
|
||||
S86_SegmentRegisterType_CS,
|
||||
S86_SegmentRegisterType_SS,
|
||||
S86_SegmentRegisterType_DS,
|
||||
S86_SegmentRegisterType_Count,
|
||||
} S86_SegmentRegisterType;
|
||||
|
||||
typedef struct S86_EffectiveAddressStr8 {
|
||||
S86_SegmentRegisterType seg_reg_type;
|
||||
S86_RegisterType reg_type;
|
||||
int32_t displacement;
|
||||
char data[32];
|
||||
size_t size;
|
||||
bool has_displacement;
|
||||
} S86_EffectiveAddressStr8;
|
||||
|
||||
S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_Str8 seg_reg);
|
||||
typedef enum S86_EffectiveAddress {
|
||||
S86_EffectiveAddress_None,
|
||||
S86_EffectiveAddress_Src,
|
||||
S86_EffectiveAddress_Dest,
|
||||
} S86_EffectiveAddress;
|
||||
|
||||
typedef enum S86_WidePrefix {
|
||||
S86_WidePrefix_None,
|
||||
S86_WidePrefix_Src,
|
||||
S86_WidePrefix_Dest,
|
||||
} S86_WidePrefix;
|
||||
|
||||
|
||||
typedef struct S86_AsmOp {
|
||||
bool effective_addr_wide_prefix;
|
||||
S86_EffectiveAddress effective_addr;
|
||||
bool has_displacement;
|
||||
bool lock;
|
||||
bool wide;
|
||||
S86_WidePrefix wide_prefix;
|
||||
S86_RegisterType src;
|
||||
S86_RegisterType dest;
|
||||
int32_t displacement;
|
||||
int32_t immediate;
|
||||
S86_SegmentRegisterType seg_reg;
|
||||
} S86_AsmOp;
|
||||
|
||||
S86_EffectiveAddressStr8 S86_EffectiveAddressCalc(S86_BufferIterator *buffer_it, uint8_t rm, uint8_t mod, uint8_t w, S86_SegmentRegisterType seg_reg);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user