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perfaware/part1: Add support for in/out"

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doyle 2023-03-18 23:37:22 +11:00 committed by committed-name
parent 61a6616d6d
commit 1cd86c0cdb
1 changed files with 43 additions and 0 deletions
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43
part1/sim8086.c
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@ -88,6 +88,12 @@ typedef enum S86_InstructionType {
S86_InstructionType_XCHGRegOrMemWithReg,
S86_InstructionType_XCHGRegWithAccum,
S86_InstructionType_INFixedPort,
S86_InstructionType_INVariablePort,
S86_InstructionType_OUTFixedPort,
S86_InstructionType_OUTVariablePort,
S86_InstructionType_ADDRegOrMemToOrFromReg,
S86_InstructionType_ADDImmediateToRegOrMem,
S86_InstructionType_ADDImmediateToAccum,
@ -456,6 +462,16 @@ int main(int argc, char **argv)
[S86_InstructionType_XCHGRegWithAccum] = {.op_mask0 = 0b1111'1000, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b1001'0000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("xchg")},
[S86_InstructionType_INFixedPort] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b1110'0100, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("in")},
[S86_InstructionType_INVariablePort] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b1110'1100, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("in")},
[S86_InstructionType_OUTFixedPort] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b1110'0110, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("out")},
[S86_InstructionType_OUTVariablePort] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b1110'1110, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("out")},
[S86_InstructionType_ADDRegOrMemToOrFromReg] = {.op_mask0 = 0b1111'1100, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b0000'0000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("add")},
[S86_InstructionType_ADDImmediateToRegOrMem] = {.op_mask0 = 0b1111'1100, .op_mask1 = 0b0011'1000,
@ -752,6 +768,33 @@ int main(int argc, char **argv)
S86_PrintLnFmt("%.*s ax, %.*s", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(reg_name));
} break;
case S86_InstructionType_INFixedPort: /*FALLTHRU*/
case S86_InstructionType_INVariablePort: /*FALLTHRU*/
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};
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);
} else {
data_val[0] = 'd';
data_val[1] = 'x';
}
S86_PrintFmt("%.*s ", S86_STR8_FMT(instruction->mnemonic));
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));
} break;
case S86_InstructionType_MOVAccumToMem: /*FALLTHRU*/
case S86_InstructionType_MOVMemToAccum: {
S86_ASSERT(op_code_size == 1);