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perfaware/part1: Add support for DEC/NEG

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This commit is contained in:
doyle 2023-03-19 14:53:18 +11:00
parent 77d624f9f6
commit 9afdb337d2
1 changed files with 24 additions and 2 deletions
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26
part1/sim8086.c
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@ -126,6 +126,10 @@ typedef enum S86_InstructionType {
S86_InstructionType_SBBImmediateFromRegOrMem,
S86_InstructionType_SBBImmediateFromAccum,
S86_InstructionType_DECRegOrMem,
S86_InstructionType_DECReg,
S86_InstructionType_NEG,
S86_InstructionType_CMPRegOrMemAndReg,
S86_InstructionType_CMPImmediateWithRegOrMem,
S86_InstructionType_CMPImmediateWithAccum,
@ -552,6 +556,13 @@ int main(int argc, char **argv)
[S86_InstructionType_SBBImmediateFromAccum] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b0001'1100, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("sbb")},
[S86_InstructionType_DECRegOrMem] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0011'1000,
.op_bits0 = 0b1111'1110, .op_bits1 = 0b0000'1000, .mnemonic = S86_STR8("dec")},
[S86_InstructionType_DECReg] = {.op_mask0 = 0b1111'1000, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b0100'1000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("dec")},
[S86_InstructionType_NEG] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0011'1000,
.op_bits0 = 0b1111'0110, .op_bits1 = 0b0001'1000, .mnemonic = S86_STR8("neg")},
[S86_InstructionType_CMPRegOrMemAndReg] = {.op_mask0 = 0b1111'1100, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b0011'1000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("cmp")},
[S86_InstructionType_CMPImmediateWithRegOrMem] = {.op_mask0 = 0b1111'1100, .op_mask1 = 0b0011'1000,
@ -661,20 +672,30 @@ int main(int argc, char **argv)
S86_Print(instruction->mnemonic);
switch (instruction_type) {
case S86_InstructionType_POPRegOrMem: /*FALLTHRU*/
case S86_InstructionType_INCRegOrMem: /*FALLTHRU*/
case S86_InstructionType_DECRegOrMem: /*FALLTHRU*/
case S86_InstructionType_NEG: /*FALLTHRU*/
case S86_InstructionType_POPRegOrMem: /*FALLTHRU*/
case S86_InstructionType_PUSHRegOrMem: {
S86_ASSERT(op_code_size == 2);
uint8_t mod = (op_code_bytes[1] & 0b1100'0000) >> 6;
uint8_t rm = (op_code_bytes[1] & 0b0000'0111) >> 0;
uint8_t w = instruction_type == S86_InstructionType_INCRegOrMem ? (op_code_bytes[0] & 0b0000'0001) : 1;
S86_ASSERT(mod < 4); S86_ASSERT(rm < 8);
uint8_t w = 1;
if (instruction_type == S86_InstructionType_INCRegOrMem ||
instruction_type == S86_InstructionType_DECRegOrMem ||
instruction_type == S86_InstructionType_NEG) {
w = op_code_bytes[0] & 0b0000'0001;
}
S86_EffectiveAddressStr8 effective_address = S86_EffectiveAddressCalc(&buffer_it, rm, mod, w);
if (effective_address.data[0] == '[')
S86_PrintFmt(" %s", w ? "word" : "byte");
S86_PrintLnFmt(" %.*s", S86_STR8_FMT(effective_address));
} break;
case S86_InstructionType_DECReg: /*FALLTHRU*/
case S86_InstructionType_INCReg: /*FALLTHRU*/
case S86_InstructionType_XCHGRegWithAccum: /*FALLTHRU*/
case S86_InstructionType_PUSHReg: /*FALLTHRU*/
@ -686,6 +707,7 @@ int main(int argc, char **argv)
if (instruction_type == S86_InstructionType_PUSHReg ||
instruction_type == S86_InstructionType_POPReg ||
instruction_type == S86_InstructionType_INCReg ||
instruction_type == S86_InstructionType_DECReg ||
instruction_type == S86_InstructionType_XCHGRegWithAccum) {
uint8_t reg = (op_code_bytes[0] & 0b0000'0111) >> 0;
reg_name = REGISTER_FIELD_ENCODING[/*w*/1][reg];