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Complete DPI execute function w/ S

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This commit is contained in:
Themis Demetriades 2024-06-03 19:35:21 +01:00
parent d9276899e4
commit 851a54a51e
1 changed files with 33 additions and 4 deletions
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37
src/execute.c
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@ -6,10 +6,14 @@
// Defines the maximum value that can be held in a register // Defines the maximum value that can be held in a register
#define MAX_REG_VAL ((1 << DWORD_BITS) - 1) #define MAX_REG_VAL ((1 << DWORD_BITS) - 1)
// The number of bits to shift the immediate value in an immediate data processing instruction // The number of bits to shift the immediate value in an arithmetic immediate data processing
// if the shift flag is enabled. // instruction if the shift flag is enabled.
#define DPI_ARITHM_SHIFT 12 #define DPI_ARITHM_SHIFT 12
// The number of bits to shift the immediate value in a wide move immediate data processing
// instruction if the shift flag is enabled.
#define DPI_WIDEMOV_SHIFT 16
// Prototypes // Prototypes
void execute_SDT(Machine *state, a64inst_instruction *inst); void execute_SDT(Machine *state, a64inst_instruction *inst);
void execute_Branch(Machine *state, a64inst_instruction *inst); void execute_Branch(Machine *state, a64inst_instruction *inst);
@ -126,12 +130,37 @@ static void executeDPImmediate(Machine *state, a64inst_instruction *inst) {
// Unknown opcode detected! // Unknown opcode detected!
default: default:
fprintf(stderr, "Unknown opcode detected in a DPI arithmetic instruction!\n"); fprintf(stderr, "Unknown opcode detected in a DPI arithmetic instruction!\n");
break; break;
} }
break; break;
// Execute a wide move data processing instruction // Execute a wide move data processing instruction
case a64inst_DPI_WIDEMOV: case a64inst_DPI_WIDEMOV:;
uint8_t shiftScalar = inst->data.DPImmediateData.processOpData.wideMovData.shiftScalar;
uint16_t immediate = inst->data.DPImmediateData.processOpData.wideMovData.immediate;
// NOTE: Not checking that shiftScalar has valid value for 32bit registers. Possibly add explicit error.
immediate = truncateValue(shiftScalar * DPI_WIDEMOV_SHIFT, regType);
switch(inst->data.DPImmediateData.processOp) {
case(a64inst_MOVN):
writeRegister(state, dest, regType, ~immediate);
break;
case(a64inst_MOVZ):
writeRegister(state, dest, regType, immediate);
break;
case(a64inst_MOVK):;
dword result = readRegister(state, dest, regType);
result = (result & ~(((1 << DPI_WIDEMOV_SHIFT) - 1) << shiftScalar)) | immediate;
writeRegister(state, dest, regType, result);
break;
default:
fprintf(stderr, "Unknown opcode detected in a DPI wide move instruction!\n");
break;
}
break; break;
// Unknown instruction detected! // Unknown instruction detected!