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perfaware/part1: Add support for xchg

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doyle 2023-03-18 23:17:06 +11:00 committed by committed-name
parent 05d4558a23
commit 61a6616d6d
1 changed files with 19 additions and 1 deletions
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20
part1/sim8086.c
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@ -85,6 +85,9 @@ typedef enum S86_InstructionType {
S86_InstructionType_POPReg,
S86_InstructionType_POPSegReg,
S86_InstructionType_XCHGRegOrMemWithReg,
S86_InstructionType_XCHGRegWithAccum,
S86_InstructionType_ADDRegOrMemToOrFromReg,
S86_InstructionType_ADDImmediateToRegOrMem,
S86_InstructionType_ADDImmediateToAccum,
@ -448,6 +451,10 @@ int main(int argc, char **argv)
[S86_InstructionType_POPSegReg] = {.op_mask0 = 0b1110'0111, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b0000'0111, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("pop")},
[S86_InstructionType_XCHGRegOrMemWithReg] = {.op_mask0 = 0b1111'1110, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b1000'0110, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("xchg")},
[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_ADDRegOrMemToOrFromReg] = {.op_mask0 = 0b1111'1100, .op_mask1 = 0b0000'0000,
.op_bits0 = 0b0000'0000, .op_bits1 = 0b0000'0000, .mnemonic = S86_STR8("add")},
@ -598,6 +605,7 @@ int main(int argc, char **argv)
S86_PrintLnFmt("%.*s %.*s", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(reg_name));
} break;
case S86_InstructionType_XCHGRegOrMemWithReg: /*FALLTHRU*/
case S86_InstructionType_CMPRegOrMemAndReg: /*FALLTHRU*/
case S86_InstructionType_SUBRegOrMemToOrFromReg: /*FALLTHRU*/
case S86_InstructionType_ADDRegOrMemToOrFromReg: /*FALLTHRU*/
@ -606,7 +614,10 @@ int main(int argc, char **argv)
S86_ASSERT(op_code_size == 1);
op_code_bytes[op_code_size++] = S86_BufferIteratorNextByte(&buffer_it);
uint8_t d = (op_code_bytes[0] & 0b0000'0010) >> 1;
uint8_t d = instruction_type == S86_InstructionType_XCHGRegOrMemWithReg
? 0
: (op_code_bytes[0] & 0b0000'0010) >> 1;
uint8_t w = (op_code_bytes[0] & 0b0000'0001) >> 0;
uint8_t mod = (op_code_bytes[1] & 0b1100'0000) >> 6;
uint8_t reg = (op_code_bytes[1] & 0b0011'1000) >> 3;
@ -734,6 +745,13 @@ int main(int argc, char **argv)
S86_PrintLnFmt("%.*s %.*s, %d", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(dest_register), (int16_t)data);
} break;
case S86_InstructionType_XCHGRegWithAccum: {
S86_ASSERT(op_code_size == 1);
uint8_t reg = (op_code_bytes[0] & 0b0000'0111) >> 0;
S86_Str8 reg_name = REGISTER_FIELD_ENCODING[1 /*w*/][reg];
S86_PrintLnFmt("%.*s ax, %.*s", S86_STR8_FMT(instruction->mnemonic), S86_STR8_FMT(reg_name));
} break;
case S86_InstructionType_MOVAccumToMem: /*FALLTHRU*/
case S86_InstructionType_MOVMemToAccum: {
S86_ASSERT(op_code_size == 1);