perfaware/part1: Add support for xchg
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@ -85,6 +85,9 @@ typedef enum S86_InstructionType {
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S86_InstructionType_POPReg,
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S86_InstructionType_POPReg,
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S86_InstructionType_POPSegReg,
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S86_InstructionType_POPSegReg,
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S86_InstructionType_XCHGRegOrMemWithReg,
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S86_InstructionType_XCHGRegWithAccum,
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S86_InstructionType_ADDRegOrMemToOrFromReg,
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S86_InstructionType_ADDRegOrMemToOrFromReg,
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S86_InstructionType_ADDImmediateToRegOrMem,
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S86_InstructionType_ADDImmediateToRegOrMem,
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S86_InstructionType_ADDImmediateToAccum,
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S86_InstructionType_ADDImmediateToAccum,
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@ -448,6 +451,10 @@ int main(int argc, char **argv)
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[S86_InstructionType_POPSegReg] = {.op_mask0 = 0b1110'0111, .op_mask1 = 0b0000'0000,
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[S86_InstructionType_POPSegReg] = {.op_mask0 = 0b1110'0111, .op_mask1 = 0b0000'0000,
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.op_bits0 = 0b0000'0111, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("pop")},
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.op_bits0 = 0b0000'0111, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("pop")},
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[S86_InstructionType_XCHGRegOrMemWithReg] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0000'0000,
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.op_bits0 = 0b1000'0110, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("xchg")},
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[S86_InstructionType_XCHGRegWithAccum] = {.op_mask0 = 0b1111'1000, .op_mask1 = 0b0000'0000,
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.op_bits0 = 0b1001'0000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("xchg")},
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[S86_InstructionType_ADDRegOrMemToOrFromReg] = {.op_mask0 = 0b1111'1100, .op_mask1 = 0b0000'0000,
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[S86_InstructionType_ADDRegOrMemToOrFromReg] = {.op_mask0 = 0b1111'1100, .op_mask1 = 0b0000'0000,
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.op_bits0 = 0b0000'0000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("add")},
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.op_bits0 = 0b0000'0000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("add")},
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@ -598,6 +605,7 @@ int main(int argc, char **argv)
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S86_PrintLnFmt("%.*s %.*s", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(reg_name));
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S86_PrintLnFmt("%.*s %.*s", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(reg_name));
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} break;
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} break;
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case S86_InstructionType_XCHGRegOrMemWithReg: /*FALLTHRU*/
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case S86_InstructionType_CMPRegOrMemAndReg: /*FALLTHRU*/
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case S86_InstructionType_CMPRegOrMemAndReg: /*FALLTHRU*/
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case S86_InstructionType_SUBRegOrMemToOrFromReg: /*FALLTHRU*/
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case S86_InstructionType_SUBRegOrMemToOrFromReg: /*FALLTHRU*/
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case S86_InstructionType_ADDRegOrMemToOrFromReg: /*FALLTHRU*/
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case S86_InstructionType_ADDRegOrMemToOrFromReg: /*FALLTHRU*/
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@ -606,7 +614,10 @@ int main(int argc, char **argv)
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S86_ASSERT(op_code_size == 1);
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S86_ASSERT(op_code_size == 1);
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op_code_bytes[op_code_size++] = S86_BufferIteratorNextByte(&buffer_it);
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op_code_bytes[op_code_size++] = S86_BufferIteratorNextByte(&buffer_it);
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uint8_t d = (op_code_bytes[0] & 0b0000'0010) >> 1;
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uint8_t d = instruction_type == S86_InstructionType_XCHGRegOrMemWithReg
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? 0
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: (op_code_bytes[0] & 0b0000'0010) >> 1;
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uint8_t w = (op_code_bytes[0] & 0b0000'0001) >> 0;
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uint8_t w = (op_code_bytes[0] & 0b0000'0001) >> 0;
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uint8_t mod = (op_code_bytes[1] & 0b1100'0000) >> 6;
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uint8_t mod = (op_code_bytes[1] & 0b1100'0000) >> 6;
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uint8_t reg = (op_code_bytes[1] & 0b0011'1000) >> 3;
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uint8_t reg = (op_code_bytes[1] & 0b0011'1000) >> 3;
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@ -734,6 +745,13 @@ int main(int argc, char **argv)
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S86_PrintLnFmt("%.*s %.*s, %d", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(dest_register), (int16_t)data);
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S86_PrintLnFmt("%.*s %.*s, %d", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(dest_register), (int16_t)data);
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} break;
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} break;
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case S86_InstructionType_XCHGRegWithAccum: {
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S86_ASSERT(op_code_size == 1);
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uint8_t reg = (op_code_bytes[0] & 0b0000'0111) >> 0;
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S86_Str8 reg_name = REGISTER_FIELD_ENCODING[1 /*w*/][reg];
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S86_PrintLnFmt("%.*s ax, %.*s", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(reg_name));
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} break;
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case S86_InstructionType_MOVAccumToMem: /*FALLTHRU*/
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case S86_InstructionType_MOVAccumToMem: /*FALLTHRU*/
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case S86_InstructionType_MOVMemToAccum: {
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case S86_InstructionType_MOVMemToAccum: {
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S86_ASSERT(op_code_size == 1);
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S86_ASSERT(op_code_size == 1);
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